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diff --git a/gcc-4.2.1/gcc/ada/sem_ch12.adb b/gcc-4.2.1/gcc/ada/sem_ch12.adb deleted file mode 100644 index 9b9313cac..000000000 --- a/gcc-4.2.1/gcc/ada/sem_ch12.adb +++ /dev/null @@ -1,10573 +0,0 @@ ------------------------------------------------------------------------------- --- -- --- GNAT COMPILER COMPONENTS -- --- -- --- S E M _ C H 1 2 -- --- -- --- B o d y -- --- -- --- Copyright (C) 1992-2006, Free Software Foundation, Inc. -- --- -- --- GNAT is free software; you can redistribute it and/or modify it under -- --- terms of the GNU General Public License as published by the Free Soft- -- --- ware Foundation; either version 2, or (at your option) any later ver- -- --- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- --- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- --- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- --- for more details. You should have received a copy of the GNU General -- --- Public License distributed with GNAT; see file COPYING. If not, write -- --- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, -- --- Boston, MA 02110-1301, USA. -- --- -- --- GNAT was originally developed by the GNAT team at New York University. -- --- Extensive contributions were provided by Ada Core Technologies Inc. -- --- -- ------------------------------------------------------------------------------- - -with Atree; use Atree; -with Einfo; use Einfo; -with Elists; use Elists; -with Errout; use Errout; -with Expander; use Expander; -with Fname; use Fname; -with Fname.UF; use Fname.UF; -with Freeze; use Freeze; -with Hostparm; -with Lib; use Lib; -with Lib.Load; use Lib.Load; -with Lib.Xref; use Lib.Xref; -with Nlists; use Nlists; -with Namet; use Namet; -with Nmake; use Nmake; -with Opt; use Opt; -with Rident; use Rident; -with Restrict; use Restrict; -with Rtsfind; use Rtsfind; -with Sem; use Sem; -with Sem_Cat; use Sem_Cat; -with Sem_Ch3; use Sem_Ch3; -with Sem_Ch6; use Sem_Ch6; -with Sem_Ch7; use Sem_Ch7; -with Sem_Ch8; use Sem_Ch8; -with Sem_Ch10; use Sem_Ch10; -with Sem_Ch13; use Sem_Ch13; -with Sem_Disp; use Sem_Disp; -with Sem_Elab; use Sem_Elab; -with Sem_Elim; use Sem_Elim; -with Sem_Eval; use Sem_Eval; -with Sem_Res; use Sem_Res; -with Sem_Type; use Sem_Type; -with Sem_Util; use Sem_Util; -with Sem_Warn; use Sem_Warn; -with Stand; use Stand; -with Sinfo; use Sinfo; -with Sinfo.CN; use Sinfo.CN; -with Sinput; use Sinput; -with Sinput.L; use Sinput.L; -with Snames; use Snames; -with Stringt; use Stringt; -with Uname; use Uname; -with Table; -with Tbuild; use Tbuild; -with Uintp; use Uintp; -with Urealp; use Urealp; - -with GNAT.HTable; - -package body Sem_Ch12 is - - ---------------------------------------------------------- - -- Implementation of Generic Analysis and Instantiation -- - ----------------------------------------------------------- - - -- GNAT implements generics by macro expansion. No attempt is made to - -- share generic instantiations (for now). Analysis of a generic definition - -- does not perform any expansion action, but the expander must be called - -- on the tree for each instantiation, because the expansion may of course - -- depend on the generic actuals. All of this is best achieved as follows: - -- - -- a) Semantic analysis of a generic unit is performed on a copy of the - -- tree for the generic unit. All tree modifications that follow analysis - -- do not affect the original tree. Links are kept between the original - -- tree and the copy, in order to recognize non-local references within - -- the generic, and propagate them to each instance (recall that name - -- resolution is done on the generic declaration: generics are not really - -- macros!). This is summarized in the following diagram: - -- - -- .-----------. .----------. - -- | semantic |<--------------| generic | - -- | copy | | unit | - -- | |==============>| | - -- |___________| global |__________| - -- references | | | - -- | | | - -- .-----|--|. - -- | .-----|---. - -- | | .----------. - -- | | | generic | - -- |__| | | - -- |__| instance | - -- |__________| - -- - -- b) Each instantiation copies the original tree, and inserts into it a - -- series of declarations that describe the mapping between generic formals - -- and actuals. For example, a generic In OUT parameter is an object - -- renaming of the corresponing actual, etc. Generic IN parameters are - -- constant declarations. - -- - -- c) In order to give the right visibility for these renamings, we use - -- a different scheme for package and subprogram instantiations. For - -- packages, the list of renamings is inserted into the package - -- specification, before the visible declarations of the package. The - -- renamings are analyzed before any of the text of the instance, and are - -- thus visible at the right place. Furthermore, outside of the instance, - -- the generic parameters are visible and denote their corresponding - -- actuals. - - -- For subprograms, we create a container package to hold the renamings - -- and the subprogram instance itself. Analysis of the package makes the - -- renaming declarations visible to the subprogram. After analyzing the - -- package, the defining entity for the subprogram is touched-up so that - -- it appears declared in the current scope, and not inside the container - -- package. - - -- If the instantiation is a compilation unit, the container package is - -- given the same name as the subprogram instance. This ensures that - -- the elaboration procedure called by the binder, using the compilation - -- unit name, calls in fact the elaboration procedure for the package. - - -- Not surprisingly, private types complicate this approach. By saving in - -- the original generic object the non-local references, we guarantee that - -- the proper entities are referenced at the point of instantiation. - -- However, for private types, this by itself does not insure that the - -- proper VIEW of the entity is used (the full type may be visible at the - -- point of generic definition, but not at instantiation, or vice-versa). - -- In order to reference the proper view, we special-case any reference - -- to private types in the generic object, by saving both views, one in - -- the generic and one in the semantic copy. At time of instantiation, we - -- check whether the two views are consistent, and exchange declarations if - -- necessary, in order to restore the correct visibility. Similarly, if - -- the instance view is private when the generic view was not, we perform - -- the exchange. After completing the instantiation, we restore the - -- current visibility. The flag Has_Private_View marks identifiers in the - -- the generic unit that require checking. - - -- Visibility within nested generic units requires special handling. - -- Consider the following scheme: - -- - -- type Global is ... -- outside of generic unit. - -- generic ... - -- package Outer is - -- ... - -- type Semi_Global is ... -- global to inner. - -- - -- generic ... -- 1 - -- procedure inner (X1 : Global; X2 : Semi_Global); - -- - -- procedure in2 is new inner (...); -- 4 - -- end Outer; - - -- package New_Outer is new Outer (...); -- 2 - -- procedure New_Inner is new New_Outer.Inner (...); -- 3 - - -- The semantic analysis of Outer captures all occurrences of Global. - -- The semantic analysis of Inner (at 1) captures both occurrences of - -- Global and Semi_Global. - - -- At point 2 (instantiation of Outer), we also produce a generic copy - -- of Inner, even though Inner is, at that point, not being instantiated. - -- (This is just part of the semantic analysis of New_Outer). - - -- Critically, references to Global within Inner must be preserved, while - -- references to Semi_Global should not preserved, because they must now - -- resolve to an entity within New_Outer. To distinguish between these, we - -- use a global variable, Current_Instantiated_Parent, which is set when - -- performing a generic copy during instantiation (at 2). This variable is - -- used when performing a generic copy that is not an instantiation, but - -- that is nested within one, as the occurrence of 1 within 2. The analysis - -- of a nested generic only preserves references that are global to the - -- enclosing Current_Instantiated_Parent. We use the Scope_Depth value to - -- determine whether a reference is external to the given parent. - - -- The instantiation at point 3 requires no special treatment. The method - -- works as well for further nestings of generic units, but of course the - -- variable Current_Instantiated_Parent must be stacked because nested - -- instantiations can occur, e.g. the occurrence of 4 within 2. - - -- The instantiation of package and subprogram bodies is handled in a - -- similar manner, except that it is delayed until after semantic - -- analysis is complete. In this fashion complex cross-dependencies - -- between several package declarations and bodies containing generics - -- can be compiled which otherwise would diagnose spurious circularities. - - -- For example, it is possible to compile two packages A and B that - -- have the following structure: - - -- package A is package B is - -- generic ... generic ... - -- package G_A is package G_B is - - -- with B; with A; - -- package body A is package body B is - -- package N_B is new G_B (..) package N_A is new G_A (..) - - -- The table Pending_Instantiations in package Inline is used to keep - -- track of body instantiations that are delayed in this manner. Inline - -- handles the actual calls to do the body instantiations. This activity - -- is part of Inline, since the processing occurs at the same point, and - -- for essentially the same reason, as the handling of inlined routines. - - ---------------------------------------------- - -- Detection of Instantiation Circularities -- - ---------------------------------------------- - - -- If we have a chain of instantiations that is circular, this is a - -- static error which must be detected at compile time. The detection - -- of these circularities is carried out at the point that we insert - -- a generic instance spec or body. If there is a circularity, then - -- the analysis of the offending spec or body will eventually result - -- in trying to load the same unit again, and we detect this problem - -- as we analyze the package instantiation for the second time. - - -- At least in some cases after we have detected the circularity, we - -- get into trouble if we try to keep going. The following flag is - -- set if a circularity is detected, and used to abandon compilation - -- after the messages have been posted. - - Circularity_Detected : Boolean := False; - -- This should really be reset on encountering a new main unit, but in - -- practice we are not using multiple main units so it is not critical. - - ----------------------- - -- Local subprograms -- - ----------------------- - - procedure Abandon_Instantiation (N : Node_Id); - pragma No_Return (Abandon_Instantiation); - -- Posts an error message "instantiation abandoned" at the indicated - -- node and then raises the exception Instantiation_Error to do it. - - procedure Analyze_Formal_Array_Type - (T : in out Entity_Id; - Def : Node_Id); - -- A formal array type is treated like an array type declaration, and - -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is - -- in-out, because in the case of an anonymous type the entity is - -- actually created in the procedure. - - -- The following procedures treat other kinds of formal parameters - - procedure Analyze_Formal_Derived_Interface_Type - (T : Entity_Id; - Def : Node_Id); - - procedure Analyze_Formal_Derived_Type - (N : Node_Id; - T : Entity_Id; - Def : Node_Id); - - -- The following subprograms create abbreviated declarations for formal - -- scalar types. We introduce an anonymous base of the proper class for - -- each of them, and define the formals as constrained first subtypes of - -- their bases. The bounds are expressions that are non-static in the - -- generic. - - procedure Analyze_Formal_Decimal_Fixed_Point_Type - (T : Entity_Id; Def : Node_Id); - procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id); - procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id); - procedure Analyze_Formal_Interface_Type (T : Entity_Id; Def : Node_Id); - procedure Analyze_Formal_Signed_Integer_Type (T : Entity_Id; Def : Node_Id); - procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id); - procedure Analyze_Formal_Ordinary_Fixed_Point_Type - (T : Entity_Id; Def : Node_Id); - - procedure Analyze_Formal_Private_Type - (N : Node_Id; - T : Entity_Id; - Def : Node_Id); - -- This needs comments??? - - procedure Analyze_Generic_Formal_Part (N : Node_Id); - - procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id); - -- This needs comments ??? - - function Analyze_Associations - (I_Node : Node_Id; - Formals : List_Id; - F_Copy : List_Id) return List_Id; - -- At instantiation time, build the list of associations between formals - -- and actuals. Each association becomes a renaming declaration for the - -- formal entity. F_Copy is the analyzed list of formals in the generic - -- copy. It is used to apply legality checks to the actuals. I_Node is the - -- instantiation node itself. - - procedure Analyze_Subprogram_Instantiation - (N : Node_Id; - K : Entity_Kind); - - procedure Build_Instance_Compilation_Unit_Nodes - (N : Node_Id; - Act_Body : Node_Id; - Act_Decl : Node_Id); - -- This procedure is used in the case where the generic instance of a - -- subprogram body or package body is a library unit. In this case, the - -- original library unit node for the generic instantiation must be - -- replaced by the resulting generic body, and a link made to a new - -- compilation unit node for the generic declaration. The argument N is - -- the original generic instantiation. Act_Body and Act_Decl are the body - -- and declaration of the instance (either package body and declaration - -- nodes or subprogram body and declaration nodes depending on the case). - -- On return, the node N has been rewritten with the actual body. - - procedure Check_Formal_Packages (P_Id : Entity_Id); - -- Apply the following to all formal packages in generic associations - - procedure Check_Formal_Package_Instance - (Formal_Pack : Entity_Id; - Actual_Pack : Entity_Id); - -- Verify that the actuals of the actual instance match the actuals of - -- the template for a formal package that is not declared with a box. - - procedure Check_Forward_Instantiation (Decl : Node_Id); - -- If the generic is a local entity and the corresponding body has not - -- been seen yet, flag enclosing packages to indicate that it will be - -- elaborated after the generic body. Subprograms declared in the same - -- package cannot be inlined by the front-end because front-end inlining - -- requires a strict linear order of elaboration. - - procedure Check_Hidden_Child_Unit - (N : Node_Id; - Gen_Unit : Entity_Id; - Act_Decl_Id : Entity_Id); - -- If the generic unit is an implicit child instance within a parent - -- instance, we need to make an explicit test that it is not hidden by - -- a child instance of the same name and parent. - - procedure Check_Private_View (N : Node_Id); - -- Check whether the type of a generic entity has a different view between - -- the point of generic analysis and the point of instantiation. If the - -- view has changed, then at the point of instantiation we restore the - -- correct view to perform semantic analysis of the instance, and reset - -- the current view after instantiation. The processing is driven by the - -- current private status of the type of the node, and Has_Private_View, - -- a flag that is set at the point of generic compilation. If view and - -- flag are inconsistent then the type is updated appropriately. - - procedure Check_Generic_Actuals - (Instance : Entity_Id; - Is_Formal_Box : Boolean); - -- Similar to previous one. Check the actuals in the instantiation, - -- whose views can change between the point of instantiation and the point - -- of instantiation of the body. In addition, mark the generic renamings - -- as generic actuals, so that they are not compatible with other actuals. - -- Recurse on an actual that is a formal package whose declaration has - -- a box. - - function Contains_Instance_Of - (Inner : Entity_Id; - Outer : Entity_Id; - N : Node_Id) return Boolean; - -- Inner is instantiated within the generic Outer. Check whether Inner - -- directly or indirectly contains an instance of Outer or of one of its - -- parents, in the case of a subunit. Each generic unit holds a list of - -- the entities instantiated within (at any depth). This procedure - -- determines whether the set of such lists contains a cycle, i.e. an - -- illegal circular instantiation. - - function Denotes_Formal_Package - (Pack : Entity_Id; - On_Exit : Boolean := False) return Boolean; - -- Returns True if E is a formal package of an enclosing generic, or - -- the actual for such a formal in an enclosing instantiation. If such - -- a package is used as a formal in an nested generic, or as an actual - -- in a nested instantiation, the visibility of ITS formals should not - -- be modified. When called from within Restore_Private_Views, the flag - -- On_Exit is true, to indicate that the search for a possible enclosing - -- instance should ignore the current one. - - function Find_Actual_Type - (Typ : Entity_Id; - Gen_Scope : Entity_Id) return Entity_Id; - -- When validating the actual types of a child instance, check whether - -- the formal is a formal type of the parent unit, and retrieve the current - -- actual for it. Typ is the entity in the analyzed formal type declaration - -- (component or index type of an array type) and Gen_Scope is the scope of - -- the analyzed formal array type. - - function In_Same_Declarative_Part - (F_Node : Node_Id; - Inst : Node_Id) return Boolean; - -- True if the instantiation Inst and the given freeze_node F_Node appear - -- within the same declarative part, ignoring subunits, but with no inter- - -- vening suprograms or concurrent units. If true, the freeze node - -- of the instance can be placed after the freeze node of the parent, - -- which it itself an instance. - - function In_Main_Context (E : Entity_Id) return Boolean; - -- Check whether an instantiation is in the context of the main unit. - -- Used to determine whether its body should be elaborated to allow - -- front-end inlining. - - procedure Set_Instance_Env - (Gen_Unit : Entity_Id; - Act_Unit : Entity_Id); - -- Save current instance on saved environment, to be used to determine - -- the global status of entities in nested instances. Part of Save_Env. - -- called after verifying that the generic unit is legal for the instance. - - procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id); - -- Associate analyzed generic parameter with corresponding - -- instance. Used for semantic checks at instantiation time. - - function Has_Been_Exchanged (E : Entity_Id) return Boolean; - -- Traverse the Exchanged_Views list to see if a type was private - -- and has already been flipped during this phase of instantiation. - - procedure Hide_Current_Scope; - -- When compiling a generic child unit, the parent context must be - -- present, but the instance and all entities that may be generated - -- must be inserted in the current scope. We leave the current scope - -- on the stack, but make its entities invisible to avoid visibility - -- problems. This is reversed at the end of instantiations. This is - -- not done for the instantiation of the bodies, which only require the - -- instances of the generic parents to be in scope. - - procedure Install_Body - (Act_Body : Node_Id; - N : Node_Id; - Gen_Body : Node_Id; - Gen_Decl : Node_Id); - -- If the instantiation happens textually before the body of the generic, - -- the instantiation of the body must be analyzed after the generic body, - -- and not at the point of instantiation. Such early instantiations can - -- happen if the generic and the instance appear in a package declaration - -- because the generic body can only appear in the corresponding package - -- body. Early instantiations can also appear if generic, instance and - -- body are all in the declarative part of a subprogram or entry. Entities - -- of packages that are early instantiations are delayed, and their freeze - -- node appears after the generic body. - - procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id); - -- Insert freeze node at the end of the declarative part that includes the - -- instance node N. If N is in the visible part of an enclosing package - -- declaration, the freeze node has to be inserted at the end of the - -- private declarations, if any. - - procedure Freeze_Subprogram_Body - (Inst_Node : Node_Id; - Gen_Body : Node_Id; - Pack_Id : Entity_Id); - -- The generic body may appear textually after the instance, including - -- in the proper body of a stub, or within a different package instance. - -- Given that the instance can only be elaborated after the generic, we - -- place freeze_nodes for the instance and/or for packages that may enclose - -- the instance and the generic, so that the back-end can establish the - -- proper order of elaboration. - - procedure Init_Env; - -- Establish environment for subsequent instantiation. Separated from - -- Save_Env because data-structures for visibility handling must be - -- initialized before call to Check_Generic_Child_Unit. - - procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False); - -- When compiling an instance of a child unit the parent (which is - -- itself an instance) is an enclosing scope that must be made - -- immediately visible. This procedure is also used to install the non- - -- generic parent of a generic child unit when compiling its body, so - -- that full views of types in the parent are made visible. - - procedure Remove_Parent (In_Body : Boolean := False); - -- Reverse effect after instantiation of child is complete - - procedure Inline_Instance_Body - (N : Node_Id; - Gen_Unit : Entity_Id; - Act_Decl : Node_Id); - -- If front-end inlining is requested, instantiate the package body, - -- and preserve the visibility of its compilation unit, to insure - -- that successive instantiations succeed. - - -- The functions Instantiate_XXX perform various legality checks and build - -- the declarations for instantiated generic parameters. In all of these - -- Formal is the entity in the generic unit, Actual is the entity of - -- expression in the generic associations, and Analyzed_Formal is the - -- formal in the generic copy, which contains the semantic information to - -- be used to validate the actual. - - function Instantiate_Object - (Formal : Node_Id; - Actual : Node_Id; - Analyzed_Formal : Node_Id) return List_Id; - - function Instantiate_Type - (Formal : Node_Id; - Actual : Node_Id; - Analyzed_Formal : Node_Id; - Actual_Decls : List_Id) return Node_Id; - - function Instantiate_Formal_Subprogram - (Formal : Node_Id; - Actual : Node_Id; - Analyzed_Formal : Node_Id) return Node_Id; - - function Instantiate_Formal_Package - (Formal : Node_Id; - Actual : Node_Id; - Analyzed_Formal : Node_Id) return List_Id; - -- If the formal package is declared with a box, special visibility rules - -- apply to its formals: they are in the visible part of the package. This - -- is true in the declarative region of the formal package, that is to say - -- in the enclosing generic or instantiation. For an instantiation, the - -- parameters of the formal package are made visible in an explicit step. - -- Furthermore, if the actual is a visible use_clause, these formals must - -- be made potentially use_visible as well. On exit from the enclosing - -- instantiation, the reverse must be done. - - -- For a formal package declared without a box, there are conformance rules - -- that apply to the actuals in the generic declaration and the actuals of - -- the actual package in the enclosing instantiation. The simplest way to - -- apply these rules is to repeat the instantiation of the formal package - -- in the context of the enclosing instance, and compare the generic - -- associations of this instantiation with those of the actual package. - - function Is_In_Main_Unit (N : Node_Id) return Boolean; - -- Test if given node is in the main unit - - procedure Load_Parent_Of_Generic (N : Node_Id; Spec : Node_Id); - -- If the generic appears in a separate non-generic library unit, - -- load the corresponding body to retrieve the body of the generic. - -- N is the node for the generic instantiation, Spec is the generic - -- package declaration. - - procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id); - -- Add the context clause of the unit containing a generic unit to - -- an instantiation that is a compilation unit. - - function Get_Associated_Node (N : Node_Id) return Node_Id; - -- In order to propagate semantic information back from the analyzed - -- copy to the original generic, we maintain links between selected nodes - -- in the generic and their corresponding copies. At the end of generic - -- analysis, the routine Save_Global_References traverses the generic - -- tree, examines the semantic information, and preserves the links to - -- those nodes that contain global information. At instantiation, the - -- information from the associated node is placed on the new copy, so - -- that name resolution is not repeated. - -- - -- Three kinds of source nodes have associated nodes: - -- - -- a) those that can reference (denote) entities, that is identifiers, - -- character literals, expanded_names, operator symbols, operators, - -- and attribute reference nodes. These nodes have an Entity field - -- and are the set of nodes that are in N_Has_Entity. - -- - -- b) aggregates (N_Aggregate and N_Extension_Aggregate) - -- - -- c) selected components (N_Selected_Component) - -- - -- For the first class, the associated node preserves the entity if it is - -- global. If the generic contains nested instantiations, the associated - -- node itself has been recopied, and a chain of them must be followed. - -- - -- For aggregates, the associated node allows retrieval of the type, which - -- may otherwise not appear in the generic. The view of this type may be - -- different between generic and instantiation, and the full view can be - -- installed before the instantiation is analyzed. For aggregates of - -- type extensions, the same view exchange may have to be performed for - -- some of the ancestor types, if their view is private at the point of - -- instantiation. - -- - -- Nodes that are selected components in the parse tree may be rewritten - -- as expanded names after resolution, and must be treated as potential - -- entity holders. which is why they also have an Associated_Node. - -- - -- Nodes that do not come from source, such as freeze nodes, do not appear - -- in the generic tree, and need not have an associated node. - -- - -- The associated node is stored in the Associated_Node field. Note that - -- this field overlaps Entity, which is fine, because the whole point is - -- that we don't need or want the normal Entity field in this situation. - - procedure Move_Freeze_Nodes - (Out_Of : Entity_Id; - After : Node_Id; - L : List_Id); - -- Freeze nodes can be generated in the analysis of a generic unit, but - -- will not be seen by the back-end. It is necessary to move those nodes - -- to the enclosing scope if they freeze an outer entity. We place them - -- at the end of the enclosing generic package, which is semantically - -- neutral. - - procedure Pre_Analyze_Actuals (N : Node_Id); - -- Analyze actuals to perform name resolution. Full resolution is done - -- later, when the expected types are known, but names have to be captured - -- before installing parents of generics, that are not visible for the - -- actuals themselves. - - procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id); - -- Verify that an attribute that appears as the default for a formal - -- subprogram is a function or procedure with the correct profile. - - ------------------------------------------- - -- Data Structures for Generic Renamings -- - ------------------------------------------- - - -- The map Generic_Renamings associates generic entities with their - -- corresponding actuals. Currently used to validate type instances. - -- It will eventually be used for all generic parameters to eliminate - -- the need for overload resolution in the instance. - - type Assoc_Ptr is new Int; - - Assoc_Null : constant Assoc_Ptr := -1; - - type Assoc is record - Gen_Id : Entity_Id; - Act_Id : Entity_Id; - Next_In_HTable : Assoc_Ptr; - end record; - - package Generic_Renamings is new Table.Table - (Table_Component_Type => Assoc, - Table_Index_Type => Assoc_Ptr, - Table_Low_Bound => 0, - Table_Initial => 10, - Table_Increment => 100, - Table_Name => "Generic_Renamings"); - - -- Variable to hold enclosing instantiation. When the environment is - -- saved for a subprogram inlining, the corresponding Act_Id is empty. - - Current_Instantiated_Parent : Assoc := (Empty, Empty, Assoc_Null); - - -- Hash table for associations - - HTable_Size : constant := 37; - type HTable_Range is range 0 .. HTable_Size - 1; - - procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr); - function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr; - function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id; - function Hash (F : Entity_Id) return HTable_Range; - - package Generic_Renamings_HTable is new GNAT.HTable.Static_HTable ( - Header_Num => HTable_Range, - Element => Assoc, - Elmt_Ptr => Assoc_Ptr, - Null_Ptr => Assoc_Null, - Set_Next => Set_Next_Assoc, - Next => Next_Assoc, - Key => Entity_Id, - Get_Key => Get_Gen_Id, - Hash => Hash, - Equal => "="); - - Exchanged_Views : Elist_Id; - -- This list holds the private views that have been exchanged during - -- instantiation to restore the visibility of the generic declaration. - -- (see comments above). After instantiation, the current visibility is - -- reestablished by means of a traversal of this list. - - Hidden_Entities : Elist_Id; - -- This list holds the entities of the current scope that are removed - -- from immediate visibility when instantiating a child unit. Their - -- visibility is restored in Remove_Parent. - - -- Because instantiations can be recursive, the following must be saved - -- on entry and restored on exit from an instantiation (spec or body). - -- This is done by the two procedures Save_Env and Restore_Env. For - -- package and subprogram instantiations (but not for the body instances) - -- the action of Save_Env is done in two steps: Init_Env is called before - -- Check_Generic_Child_Unit, because setting the parent instances requires - -- that the visibility data structures be properly initialized. Once the - -- generic is unit is validated, Set_Instance_Env completes Save_Env. - - Parent_Unit_Visible : Boolean := False; - -- Parent_Unit_Visible is used when the generic is a child unit, and - -- indicates whether the ultimate parent of the generic is visible in the - -- instantiation environment. It is used to reset the visibility of the - -- parent at the end of the instantiation (see Remove_Parent). - - Instance_Parent_Unit : Entity_Id := Empty; - -- This records the ultimate parent unit of an instance of a generic - -- child unit and is used in conjunction with Parent_Unit_Visible to - -- indicate the unit to which the Parent_Unit_Visible flag corresponds. - - type Instance_Env is record - Ada_Version : Ada_Version_Type; - Ada_Version_Explicit : Ada_Version_Type; - Instantiated_Parent : Assoc; - Exchanged_Views : Elist_Id; - Hidden_Entities : Elist_Id; - Current_Sem_Unit : Unit_Number_Type; - Parent_Unit_Visible : Boolean := False; - Instance_Parent_Unit : Entity_Id := Empty; - end record; - - package Instance_Envs is new Table.Table ( - Table_Component_Type => Instance_Env, - Table_Index_Type => Int, - Table_Low_Bound => 0, - Table_Initial => 32, - Table_Increment => 100, - Table_Name => "Instance_Envs"); - - procedure Restore_Private_Views - (Pack_Id : Entity_Id; - Is_Package : Boolean := True); - -- Restore the private views of external types, and unmark the generic - -- renamings of actuals, so that they become comptible subtypes again. - -- For subprograms, Pack_Id is the package constructed to hold the - -- renamings. - - procedure Switch_View (T : Entity_Id); - -- Switch the partial and full views of a type and its private - -- dependents (i.e. its subtypes and derived types). - - ------------------------------------ - -- Structures for Error Reporting -- - ------------------------------------ - - Instantiation_Node : Node_Id; - -- Used by subprograms that validate instantiation of formal parameters - -- where there might be no actual on which to place the error message. - -- Also used to locate the instantiation node for generic subunits. - - Instantiation_Error : exception; - -- When there is a semantic error in the generic parameter matching, - -- there is no point in continuing the instantiation, because the - -- number of cascaded errors is unpredictable. This exception aborts - -- the instantiation process altogether. - - S_Adjustment : Sloc_Adjustment; - -- Offset created for each node in an instantiation, in order to keep - -- track of the source position of the instantiation in each of its nodes. - -- A subsequent semantic error or warning on a construct of the instance - -- points to both places: the original generic node, and the point of - -- instantiation. See Sinput and Sinput.L for additional details. - - ------------------------------------------------------------ - -- Data structure for keeping track when inside a Generic -- - ------------------------------------------------------------ - - -- The following table is used to save values of the Inside_A_Generic - -- flag (see spec of Sem) when they are saved by Start_Generic. - - package Generic_Flags is new Table.Table ( - Table_Component_Type => Boolean, - Table_Index_Type => Int, - Table_Low_Bound => 0, - Table_Initial => 32, - Table_Increment => 200, - Table_Name => "Generic_Flags"); - - --------------------------- - -- Abandon_Instantiation -- - --------------------------- - - procedure Abandon_Instantiation (N : Node_Id) is - begin - Error_Msg_N ("instantiation abandoned!", N); - raise Instantiation_Error; - end Abandon_Instantiation; - - -------------------------- - -- Analyze_Associations -- - -------------------------- - - function Analyze_Associations - (I_Node : Node_Id; - Formals : List_Id; - F_Copy : List_Id) return List_Id - is - Actual_Types : constant Elist_Id := New_Elmt_List; - Assoc : constant List_Id := New_List; - Defaults : constant Elist_Id := New_Elmt_List; - Gen_Unit : constant Entity_Id := Defining_Entity (Parent (F_Copy)); - Actuals : List_Id; - Actual : Node_Id; - Formal : Node_Id; - Next_Formal : Node_Id; - Temp_Formal : Node_Id; - Analyzed_Formal : Node_Id; - Match : Node_Id; - Named : Node_Id; - First_Named : Node_Id := Empty; - Found_Assoc : Node_Id; - Is_Named_Assoc : Boolean; - Num_Matched : Int := 0; - Num_Actuals : Int := 0; - - function Matching_Actual - (F : Entity_Id; - A_F : Entity_Id) return Node_Id; - -- Find actual that corresponds to a given a formal parameter. If the - -- actuals are positional, return the next one, if any. If the actuals - -- are named, scan the parameter associations to find the right one. - -- A_F is the corresponding entity in the analyzed generic,which is - -- placed on the selector name for ASIS use. - - procedure Set_Analyzed_Formal; - -- Find the node in the generic copy that corresponds to a given formal. - -- The semantic information on this node is used to perform legality - -- checks on the actuals. Because semantic analysis can introduce some - -- anonymous entities or modify the declaration node itself, the - -- correspondence between the two lists is not one-one. In addition to - -- anonymous types, the presence a formal equality will introduce an - -- implicit declaration for the corresponding inequality. - - --------------------- - -- Matching_Actual -- - --------------------- - - function Matching_Actual - (F : Entity_Id; - A_F : Entity_Id) return Node_Id - is - Found : Node_Id; - Prev : Node_Id; - - begin - Is_Named_Assoc := False; - - -- End of list of purely positional parameters - - if No (Actual) then - Found := Empty; - - -- Case of positional parameter corresponding to current formal - - elsif No (Selector_Name (Actual)) then - Found := Explicit_Generic_Actual_Parameter (Actual); - Found_Assoc := Actual; - Num_Matched := Num_Matched + 1; - Next (Actual); - - -- Otherwise scan list of named actuals to find the one with the - -- desired name. All remaining actuals have explicit names. - - else - Is_Named_Assoc := True; - Found := Empty; - Prev := Empty; - - while Present (Actual) loop - if Chars (Selector_Name (Actual)) = Chars (F) then - Found := Explicit_Generic_Actual_Parameter (Actual); - Set_Entity (Selector_Name (Actual), A_F); - Set_Etype (Selector_Name (Actual), Etype (A_F)); - Generate_Reference (A_F, Selector_Name (Actual)); - Found_Assoc := Actual; - Num_Matched := Num_Matched + 1; - exit; - end if; - - Prev := Actual; - Next (Actual); - end loop; - - -- Reset for subsequent searches. In most cases the named - -- associations are in order. If they are not, we reorder them - -- to avoid scanning twice the same actual. This is not just a - -- question of efficiency: there may be multiple defaults with - -- boxes that have the same name. In a nested instantiation we - -- insert actuals for those defaults, and cannot rely on their - -- names to disambiguate them. - - if Actual = First_Named then - Next (First_Named); - - elsif Present (Actual) then - Insert_Before (First_Named, Remove_Next (Prev)); - end if; - - Actual := First_Named; - end if; - - return Found; - end Matching_Actual; - - ------------------------- - -- Set_Analyzed_Formal -- - ------------------------- - - procedure Set_Analyzed_Formal is - Kind : Node_Kind; - begin - while Present (Analyzed_Formal) loop - Kind := Nkind (Analyzed_Formal); - - case Nkind (Formal) is - - when N_Formal_Subprogram_Declaration => - exit when Kind in N_Formal_Subprogram_Declaration - and then - Chars - (Defining_Unit_Name (Specification (Formal))) = - Chars - (Defining_Unit_Name (Specification (Analyzed_Formal))); - - when N_Formal_Package_Declaration => - exit when - Kind = N_Formal_Package_Declaration - or else - Kind = N_Generic_Package_Declaration; - - when N_Use_Package_Clause | N_Use_Type_Clause => exit; - - when others => - - -- Skip freeze nodes, and nodes inserted to replace - -- unrecognized pragmas. - - exit when - Kind not in N_Formal_Subprogram_Declaration - and then Kind /= N_Subprogram_Declaration - and then Kind /= N_Freeze_Entity - and then Kind /= N_Null_Statement - and then Kind /= N_Itype_Reference - and then Chars (Defining_Identifier (Formal)) = - Chars (Defining_Identifier (Analyzed_Formal)); - end case; - - Next (Analyzed_Formal); - end loop; - - end Set_Analyzed_Formal; - - -- Start of processing for Analyze_Associations - - begin - -- If named associations are present, save the first named association - -- (it may of course be Empty) to facilitate subsequent name search. - - Actuals := Generic_Associations (I_Node); - - if Present (Actuals) then - First_Named := First (Actuals); - - while Present (First_Named) - and then No (Selector_Name (First_Named)) - loop - Num_Actuals := Num_Actuals + 1; - Next (First_Named); - end loop; - end if; - - Named := First_Named; - while Present (Named) loop - if No (Selector_Name (Named)) then - Error_Msg_N ("invalid positional actual after named one", Named); - Abandon_Instantiation (Named); - end if; - - -- A named association may lack an actual parameter, if it was - -- introduced for a default subprogram that turns out to be local - -- to the outer instantiation. - - if Present (Explicit_Generic_Actual_Parameter (Named)) then - Num_Actuals := Num_Actuals + 1; - end if; - - Next (Named); - end loop; - - if Present (Formals) then - Formal := First_Non_Pragma (Formals); - Analyzed_Formal := First_Non_Pragma (F_Copy); - - if Present (Actuals) then - Actual := First (Actuals); - - -- All formals should have default values - - else - Actual := Empty; - end if; - - while Present (Formal) loop - Set_Analyzed_Formal; - Next_Formal := Next_Non_Pragma (Formal); - - case Nkind (Formal) is - when N_Formal_Object_Declaration => - Match := - Matching_Actual ( - Defining_Identifier (Formal), - Defining_Identifier (Analyzed_Formal)); - - Append_List - (Instantiate_Object (Formal, Match, Analyzed_Formal), - Assoc); - - when N_Formal_Type_Declaration => - Match := - Matching_Actual ( - Defining_Identifier (Formal), - Defining_Identifier (Analyzed_Formal)); - - if No (Match) then - Error_Msg_Sloc := Sloc (Gen_Unit); - Error_Msg_NE - ("missing actual&", - Instantiation_Node, Defining_Identifier (Formal)); - Error_Msg_NE ("\in instantiation of & declared#", - Instantiation_Node, Gen_Unit); - Abandon_Instantiation (Instantiation_Node); - - else - Analyze (Match); - Append_To (Assoc, - Instantiate_Type - (Formal, Match, Analyzed_Formal, Assoc)); - - -- An instantiation is a freeze point for the actuals, - -- unless this is a rewritten formal package. - - if Nkind (I_Node) /= N_Formal_Package_Declaration then - Append_Elmt (Entity (Match), Actual_Types); - end if; - end if; - - -- A remote access-to-class-wide type must not be an - -- actual parameter for a generic formal of an access - -- type (E.2.2 (17)). - - if Nkind (Analyzed_Formal) = N_Formal_Type_Declaration - and then - Nkind (Formal_Type_Definition (Analyzed_Formal)) = - N_Access_To_Object_Definition - then - Validate_Remote_Access_To_Class_Wide_Type (Match); - end if; - - when N_Formal_Subprogram_Declaration => - Match := - Matching_Actual ( - Defining_Unit_Name (Specification (Formal)), - Defining_Unit_Name (Specification (Analyzed_Formal))); - - -- If the formal subprogram has the same name as - -- another formal subprogram of the generic, then - -- a named association is illegal (12.3(9)). Exclude - -- named associations that are generated for a nested - -- instance. - - if Present (Match) - and then Is_Named_Assoc - and then Comes_From_Source (Found_Assoc) - then - Temp_Formal := First (Formals); - while Present (Temp_Formal) loop - if Nkind (Temp_Formal) in - N_Formal_Subprogram_Declaration - and then Temp_Formal /= Formal - and then - Chars (Selector_Name (Found_Assoc)) = - Chars (Defining_Unit_Name - (Specification (Temp_Formal))) - then - Error_Msg_N - ("name not allowed for overloaded formal", - Found_Assoc); - Abandon_Instantiation (Instantiation_Node); - end if; - - Next (Temp_Formal); - end loop; - end if; - - Append_To (Assoc, - Instantiate_Formal_Subprogram - (Formal, Match, Analyzed_Formal)); - - if No (Match) - and then Box_Present (Formal) - then - Append_Elmt - (Defining_Unit_Name (Specification (Last (Assoc))), - Defaults); - end if; - - when N_Formal_Package_Declaration => - Match := - Matching_Actual ( - Defining_Identifier (Formal), - Defining_Identifier (Original_Node (Analyzed_Formal))); - - if No (Match) then - Error_Msg_Sloc := Sloc (Gen_Unit); - Error_Msg_NE - ("missing actual&", - Instantiation_Node, Defining_Identifier (Formal)); - Error_Msg_NE ("\in instantiation of & declared#", - Instantiation_Node, Gen_Unit); - - Abandon_Instantiation (Instantiation_Node); - - else - Analyze (Match); - Append_List - (Instantiate_Formal_Package - (Formal, Match, Analyzed_Formal), - Assoc); - end if; - - -- For use type and use package appearing in the context - -- clause, we have already copied them, so we can just - -- move them where they belong (we mustn't recopy them - -- since this would mess up the Sloc values). - - when N_Use_Package_Clause | - N_Use_Type_Clause => - Remove (Formal); - Append (Formal, Assoc); - - when others => - raise Program_Error; - - end case; - - Formal := Next_Formal; - Next_Non_Pragma (Analyzed_Formal); - end loop; - - if Num_Actuals > Num_Matched then - Error_Msg_Sloc := Sloc (Gen_Unit); - - if Present (Selector_Name (Actual)) then - Error_Msg_NE - ("unmatched actual&", - Actual, Selector_Name (Actual)); - Error_Msg_NE ("\in instantiation of& declared#", - Actual, Gen_Unit); - else - Error_Msg_NE - ("unmatched actual in instantiation of& declared#", - Actual, Gen_Unit); - end if; - end if; - - elsif Present (Actuals) then - Error_Msg_N - ("too many actuals in generic instantiation", Instantiation_Node); - end if; - - declare - Elmt : Elmt_Id := First_Elmt (Actual_Types); - - begin - while Present (Elmt) loop - Freeze_Before (I_Node, Node (Elmt)); - Next_Elmt (Elmt); - end loop; - end; - - -- If there are default subprograms, normalize the tree by adding - -- explicit associations for them. This is required if the instance - -- appears within a generic. - - declare - Elmt : Elmt_Id; - Subp : Entity_Id; - New_D : Node_Id; - - begin - Elmt := First_Elmt (Defaults); - while Present (Elmt) loop - if No (Actuals) then - Actuals := New_List; - Set_Generic_Associations (I_Node, Actuals); - end if; - - Subp := Node (Elmt); - New_D := - Make_Generic_Association (Sloc (Subp), - Selector_Name => New_Occurrence_Of (Subp, Sloc (Subp)), - Explicit_Generic_Actual_Parameter => - New_Occurrence_Of (Subp, Sloc (Subp))); - Mark_Rewrite_Insertion (New_D); - Append_To (Actuals, New_D); - Next_Elmt (Elmt); - end loop; - end; - - return Assoc; - end Analyze_Associations; - - ------------------------------- - -- Analyze_Formal_Array_Type -- - ------------------------------- - - procedure Analyze_Formal_Array_Type - (T : in out Entity_Id; - Def : Node_Id) - is - DSS : Node_Id; - - begin - -- Treated like a non-generic array declaration, with - -- additional semantic checks. - - Enter_Name (T); - - if Nkind (Def) = N_Constrained_Array_Definition then - DSS := First (Discrete_Subtype_Definitions (Def)); - while Present (DSS) loop - if Nkind (DSS) = N_Subtype_Indication - or else Nkind (DSS) = N_Range - or else Nkind (DSS) = N_Attribute_Reference - then - Error_Msg_N ("only a subtype mark is allowed in a formal", DSS); - end if; - - Next (DSS); - end loop; - end if; - - Array_Type_Declaration (T, Def); - Set_Is_Generic_Type (Base_Type (T)); - - if Ekind (Component_Type (T)) = E_Incomplete_Type - and then No (Full_View (Component_Type (T))) - then - Error_Msg_N ("premature usage of incomplete type", Def); - - -- Check that range constraint is not allowed on the component type - -- of a generic formal array type (AARM 12.5.3(3)) - - elsif Is_Internal (Component_Type (T)) - and then Present (Subtype_Indication (Component_Definition (Def))) - and then Nkind (Original_Node - (Subtype_Indication (Component_Definition (Def)))) - = N_Subtype_Indication - then - Error_Msg_N - ("in a formal, a subtype indication can only be " - & "a subtype mark ('R'M 12.5.3(3))", - Subtype_Indication (Component_Definition (Def))); - end if; - - end Analyze_Formal_Array_Type; - - --------------------------------------------- - -- Analyze_Formal_Decimal_Fixed_Point_Type -- - --------------------------------------------- - - -- As for other generic types, we create a valid type representation - -- with legal but arbitrary attributes, whose values are never considered - -- static. For all scalar types we introduce an anonymous base type, with - -- the same attributes. We choose the corresponding integer type to be - -- Standard_Integer. - - procedure Analyze_Formal_Decimal_Fixed_Point_Type - (T : Entity_Id; - Def : Node_Id) - is - Loc : constant Source_Ptr := Sloc (Def); - Base : constant Entity_Id := - New_Internal_Entity - (E_Decimal_Fixed_Point_Type, - Current_Scope, Sloc (Def), 'G'); - Int_Base : constant Entity_Id := Standard_Integer; - Delta_Val : constant Ureal := Ureal_1; - Digs_Val : constant Uint := Uint_6; - - begin - Enter_Name (T); - - Set_Etype (Base, Base); - Set_Size_Info (Base, Int_Base); - Set_RM_Size (Base, RM_Size (Int_Base)); - Set_First_Rep_Item (Base, First_Rep_Item (Int_Base)); - Set_Digits_Value (Base, Digs_Val); - Set_Delta_Value (Base, Delta_Val); - Set_Small_Value (Base, Delta_Val); - Set_Scalar_Range (Base, - Make_Range (Loc, - Low_Bound => Make_Real_Literal (Loc, Ureal_1), - High_Bound => Make_Real_Literal (Loc, Ureal_1))); - - Set_Is_Generic_Type (Base); - Set_Parent (Base, Parent (Def)); - - Set_Ekind (T, E_Decimal_Fixed_Point_Subtype); - Set_Etype (T, Base); - Set_Size_Info (T, Int_Base); - Set_RM_Size (T, RM_Size (Int_Base)); - Set_First_Rep_Item (T, First_Rep_Item (Int_Base)); - Set_Digits_Value (T, Digs_Val); - Set_Delta_Value (T, Delta_Val); - Set_Small_Value (T, Delta_Val); - Set_Scalar_Range (T, Scalar_Range (Base)); - Set_Is_Constrained (T); - - Check_Restriction (No_Fixed_Point, Def); - end Analyze_Formal_Decimal_Fixed_Point_Type; - - ------------------------------------------- - -- Analyze_Formal_Derived_Interface_Type -- - ------------------------------------------- - - procedure Analyze_Formal_Derived_Interface_Type - (T : Entity_Id; - Def : Node_Id) - is - begin - Enter_Name (T); - Set_Ekind (T, E_Record_Type); - Set_Etype (T, T); - Analyze (Subtype_Indication (Def)); - Analyze_Interface_Declaration (T, Def); - Make_Class_Wide_Type (T); - Set_Primitive_Operations (T, New_Elmt_List); - Analyze_List (Interface_List (Def)); - Collect_Interfaces (Def, T); - end Analyze_Formal_Derived_Interface_Type; - - --------------------------------- - -- Analyze_Formal_Derived_Type -- - --------------------------------- - - procedure Analyze_Formal_Derived_Type - (N : Node_Id; - T : Entity_Id; - Def : Node_Id) - is - Loc : constant Source_Ptr := Sloc (Def); - Unk_Disc : constant Boolean := Unknown_Discriminants_Present (N); - New_N : Node_Id; - - begin - Set_Is_Generic_Type (T); - - if Private_Present (Def) then - New_N := - Make_Private_Extension_Declaration (Loc, - Defining_Identifier => T, - Discriminant_Specifications => Discriminant_Specifications (N), - Unknown_Discriminants_Present => Unk_Disc, - Subtype_Indication => Subtype_Mark (Def)); - - Set_Abstract_Present (New_N, Abstract_Present (Def)); - Set_Limited_Present (New_N, Limited_Present (Def)); - - else - New_N := - Make_Full_Type_Declaration (Loc, - Defining_Identifier => T, - Discriminant_Specifications => - Discriminant_Specifications (Parent (T)), - Type_Definition => - Make_Derived_Type_Definition (Loc, - Subtype_Indication => Subtype_Mark (Def))); - - Set_Abstract_Present - (Type_Definition (New_N), Abstract_Present (Def)); - Set_Limited_Present - (Type_Definition (New_N), Limited_Present (Def)); - end if; - - Rewrite (N, New_N); - Analyze (N); - - if Unk_Disc then - if not Is_Composite_Type (T) then - Error_Msg_N - ("unknown discriminants not allowed for elementary types", N); - else - Set_Has_Unknown_Discriminants (T); - Set_Is_Constrained (T, False); - end if; - end if; - - -- If the parent type has a known size, so does the formal, which - -- makes legal representation clauses that involve the formal. - - Set_Size_Known_At_Compile_Time - (T, Size_Known_At_Compile_Time (Entity (Subtype_Mark (Def)))); - - end Analyze_Formal_Derived_Type; - - ---------------------------------- - -- Analyze_Formal_Discrete_Type -- - ---------------------------------- - - -- The operations defined for a discrete types are those of an - -- enumeration type. The size is set to an arbitrary value, for use - -- in analyzing the generic unit. - - procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id) is - Loc : constant Source_Ptr := Sloc (Def); - Lo : Node_Id; - Hi : Node_Id; - - Base : constant Entity_Id := - New_Internal_Entity - (E_Floating_Point_Type, Current_Scope, Sloc (Def), 'G'); - begin - Enter_Name (T); - Set_Ekind (T, E_Enumeration_Subtype); - Set_Etype (T, Base); - Init_Size (T, 8); - Init_Alignment (T); - Set_Is_Generic_Type (T); - Set_Is_Constrained (T); - - -- For semantic analysis, the bounds of the type must be set to some - -- non-static value. The simplest is to create attribute nodes for - -- those bounds, that refer to the type itself. These bounds are never - -- analyzed but serve as place-holders. - - Lo := - Make_Attribute_Reference (Loc, - Attribute_Name => Name_First, - Prefix => New_Reference_To (T, Loc)); - Set_Etype (Lo, T); - - Hi := - Make_Attribute_Reference (Loc, - Attribute_Name => Name_Last, - Prefix => New_Reference_To (T, Loc)); - Set_Etype (Hi, T); - - Set_Scalar_Range (T, - Make_Range (Loc, - Low_Bound => Lo, - High_Bound => Hi)); - - Set_Ekind (Base, E_Enumeration_Type); - Set_Etype (Base, Base); - Init_Size (Base, 8); - Init_Alignment (Base); - Set_Is_Generic_Type (Base); - Set_Scalar_Range (Base, Scalar_Range (T)); - Set_Parent (Base, Parent (Def)); - - end Analyze_Formal_Discrete_Type; - - ---------------------------------- - -- Analyze_Formal_Floating_Type -- - --------------------------------- - - procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id) is - Base : constant Entity_Id := - New_Internal_Entity - (E_Floating_Point_Type, Current_Scope, Sloc (Def), 'G'); - - begin - -- The various semantic attributes are taken from the predefined type - -- Float, just so that all of them are initialized. Their values are - -- never used because no constant folding or expansion takes place in - -- the generic itself. - - Enter_Name (T); - Set_Ekind (T, E_Floating_Point_Subtype); - Set_Etype (T, Base); - Set_Size_Info (T, (Standard_Float)); - Set_RM_Size (T, RM_Size (Standard_Float)); - Set_Digits_Value (T, Digits_Value (Standard_Float)); - Set_Scalar_Range (T, Scalar_Range (Standard_Float)); - Set_Is_Constrained (T); - - Set_Is_Generic_Type (Base); - Set_Etype (Base, Base); - Set_Size_Info (Base, (Standard_Float)); - Set_RM_Size (Base, RM_Size (Standard_Float)); - Set_Digits_Value (Base, Digits_Value (Standard_Float)); - Set_Scalar_Range (Base, Scalar_Range (Standard_Float)); - Set_Parent (Base, Parent (Def)); - - Check_Restriction (No_Floating_Point, Def); - end Analyze_Formal_Floating_Type; - - ----------------------------------- - -- Analyze_Formal_Interface_Type;-- - ----------------------------------- - - procedure Analyze_Formal_Interface_Type (T : Entity_Id; Def : Node_Id) is - begin - Enter_Name (T); - Set_Ekind (T, E_Record_Type); - Set_Etype (T, T); - Analyze_Interface_Declaration (T, Def); - Make_Class_Wide_Type (T); - Set_Primitive_Operations (T, New_Elmt_List); - end Analyze_Formal_Interface_Type; - - --------------------------------- - -- Analyze_Formal_Modular_Type -- - --------------------------------- - - procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id) is - begin - -- Apart from their entity kind, generic modular types are treated - -- like signed integer types, and have the same attributes. - - Analyze_Formal_Signed_Integer_Type (T, Def); - Set_Ekind (T, E_Modular_Integer_Subtype); - Set_Ekind (Etype (T), E_Modular_Integer_Type); - - end Analyze_Formal_Modular_Type; - - --------------------------------------- - -- Analyze_Formal_Object_Declaration -- - --------------------------------------- - - procedure Analyze_Formal_Object_Declaration (N : Node_Id) is - E : constant Node_Id := Expression (N); - Id : constant Node_Id := Defining_Identifier (N); - K : Entity_Kind; - T : Node_Id; - - begin - Enter_Name (Id); - - -- Determine the mode of the formal object - - if Out_Present (N) then - K := E_Generic_In_Out_Parameter; - - if not In_Present (N) then - Error_Msg_N ("formal generic objects cannot have mode OUT", N); - end if; - - else - K := E_Generic_In_Parameter; - end if; - - Find_Type (Subtype_Mark (N)); - T := Entity (Subtype_Mark (N)); - - if Ekind (T) = E_Incomplete_Type then - Error_Msg_N ("premature usage of incomplete type", Subtype_Mark (N)); - end if; - - if K = E_Generic_In_Parameter then - - -- Ada 2005 (AI-287): Limited aggregates allowed in generic formals - - if Ada_Version < Ada_05 and then Is_Limited_Type (T) then - Error_Msg_N - ("generic formal of mode IN must not be of limited type", N); - Explain_Limited_Type (T, N); - end if; - - if Is_Abstract (T) then - Error_Msg_N - ("generic formal of mode IN must not be of abstract type", N); - end if; - - if Present (E) then - Analyze_Per_Use_Expression (E, T); - end if; - - Set_Ekind (Id, K); - Set_Etype (Id, T); - - -- Case of generic IN OUT parameter - - else - -- If the formal has an unconstrained type, construct its - -- actual subtype, as is done for subprogram formals. In this - -- fashion, all its uses can refer to specific bounds. - - Set_Ekind (Id, K); - Set_Etype (Id, T); - - if (Is_Array_Type (T) - and then not Is_Constrained (T)) - or else - (Ekind (T) = E_Record_Type - and then Has_Discriminants (T)) - then - declare - Non_Freezing_Ref : constant Node_Id := - New_Reference_To (Id, Sloc (Id)); - Decl : Node_Id; - - begin - -- Make sure that the actual subtype doesn't generate - -- bogus freezing. - - Set_Must_Not_Freeze (Non_Freezing_Ref); - Decl := Build_Actual_Subtype (T, Non_Freezing_Ref); - Insert_Before_And_Analyze (N, Decl); - Set_Actual_Subtype (Id, Defining_Identifier (Decl)); - end; - else - Set_Actual_Subtype (Id, T); - end if; - - if Present (E) then - Error_Msg_N - ("initialization not allowed for `IN OUT` formals", N); - end if; - end if; - - end Analyze_Formal_Object_Declaration; - - ---------------------------------------------- - -- Analyze_Formal_Ordinary_Fixed_Point_Type -- - ---------------------------------------------- - - procedure Analyze_Formal_Ordinary_Fixed_Point_Type - (T : Entity_Id; - Def : Node_Id) - is - Loc : constant Source_Ptr := Sloc (Def); - Base : constant Entity_Id := - New_Internal_Entity - (E_Ordinary_Fixed_Point_Type, Current_Scope, Sloc (Def), 'G'); - begin - -- The semantic attributes are set for completeness only, their - -- values will never be used, because all properties of the type - -- are non-static. - - Enter_Name (T); - Set_Ekind (T, E_Ordinary_Fixed_Point_Subtype); - Set_Etype (T, Base); - Set_Size_Info (T, Standard_Integer); - Set_RM_Size (T, RM_Size (Standard_Integer)); - Set_Small_Value (T, Ureal_1); - Set_Delta_Value (T, Ureal_1); - Set_Scalar_Range (T, - Make_Range (Loc, - Low_Bound => Make_Real_Literal (Loc, Ureal_1), - High_Bound => Make_Real_Literal (Loc, Ureal_1))); - Set_Is_Constrained (T); - - Set_Is_Generic_Type (Base); - Set_Etype (Base, Base); - Set_Size_Info (Base, Standard_Integer); - Set_RM_Size (Base, RM_Size (Standard_Integer)); - Set_Small_Value (Base, Ureal_1); - Set_Delta_Value (Base, Ureal_1); - Set_Scalar_Range (Base, Scalar_Range (T)); - Set_Parent (Base, Parent (Def)); - - Check_Restriction (No_Fixed_Point, Def); - end Analyze_Formal_Ordinary_Fixed_Point_Type; - - ---------------------------- - -- Analyze_Formal_Package -- - ---------------------------- - - procedure Analyze_Formal_Package (N : Node_Id) is - Loc : constant Source_Ptr := Sloc (N); - Pack_Id : constant Entity_Id := Defining_Identifier (N); - Formal : Entity_Id; - Gen_Id : constant Node_Id := Name (N); - Gen_Decl : Node_Id; - Gen_Unit : Entity_Id; - New_N : Node_Id; - Parent_Installed : Boolean := False; - Renaming : Node_Id; - Parent_Instance : Entity_Id; - Renaming_In_Par : Entity_Id; - - begin - Text_IO_Kludge (Gen_Id); - - Init_Env; - Check_Generic_Child_Unit (Gen_Id, Parent_Installed); - Gen_Unit := Entity (Gen_Id); - - -- Check for a formal package that is a package renaming - - if Present (Renamed_Object (Gen_Unit)) then - Gen_Unit := Renamed_Object (Gen_Unit); - end if; - - if Ekind (Gen_Unit) /= E_Generic_Package then - Error_Msg_N ("expect generic package name", Gen_Id); - Restore_Env; - return; - - elsif Gen_Unit = Current_Scope then - Error_Msg_N - ("generic package cannot be used as a formal package of itself", - Gen_Id); - Restore_Env; - return; - - elsif In_Open_Scopes (Gen_Unit) then - if Is_Compilation_Unit (Gen_Unit) - and then Is_Child_Unit (Current_Scope) - then - -- Special-case the error when the formal is a parent, and - -- continue analysis to minimize cascaded errors. - - Error_Msg_N - ("generic parent cannot be used as formal package " - & "of a child unit", - Gen_Id); - - else - Error_Msg_N - ("generic package cannot be used as a formal package " - & "within itself", - Gen_Id); - Restore_Env; - return; - end if; - end if; - - -- The formal package is treated like a regular instance, but only - -- the specification needs to be instantiated, to make entities visible. - - if not Box_Present (N) then - Hidden_Entities := New_Elmt_List; - Analyze_Package_Instantiation (N); - - if Parent_Installed then - Remove_Parent; - end if; - - else - -- If there are no generic associations, the generic parameters - -- appear as local entities and are instantiated like them. We copy - -- the generic package declaration as if it were an instantiation, - -- and analyze it like a regular package, except that we treat the - -- formals as additional visible components. - - Gen_Decl := Unit_Declaration_Node (Gen_Unit); - - if In_Extended_Main_Source_Unit (N) then - Set_Is_Instantiated (Gen_Unit); - Generate_Reference (Gen_Unit, N); - end if; - - Formal := New_Copy (Pack_Id); - Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment); - - New_N := - Copy_Generic_Node - (Original_Node (Gen_Decl), Empty, Instantiating => True); - Rewrite (N, New_N); - Set_Defining_Unit_Name (Specification (New_N), Formal); - Set_Generic_Parent (Specification (N), Gen_Unit); - Set_Instance_Env (Gen_Unit, Formal); - - Enter_Name (Formal); - Set_Ekind (Formal, E_Generic_Package); - Set_Etype (Formal, Standard_Void_Type); - Set_Inner_Instances (Formal, New_Elmt_List); - New_Scope (Formal); - - -- Within the formal, the name of the generic package is a renaming - -- of the formal (as for a regular instantiation). - - Renaming := Make_Package_Renaming_Declaration (Loc, - Defining_Unit_Name => - Make_Defining_Identifier (Loc, Chars (Gen_Unit)), - Name => New_Reference_To (Formal, Loc)); - - if Present (Visible_Declarations (Specification (N))) then - Prepend (Renaming, To => Visible_Declarations (Specification (N))); - elsif Present (Private_Declarations (Specification (N))) then - Prepend (Renaming, To => Private_Declarations (Specification (N))); - end if; - - if Is_Child_Unit (Gen_Unit) - and then Parent_Installed - then - -- Similarly, we have to make the name of the formal visible in - -- the parent instance, to resolve properly fully qualified names - -- that may appear in the generic unit. The parent instance has - -- been placed on the scope stack ahead of the current scope. - - Parent_Instance := Scope_Stack.Table (Scope_Stack.Last - 1).Entity; - - Renaming_In_Par := - Make_Defining_Identifier (Loc, Chars (Gen_Unit)); - Set_Ekind (Renaming_In_Par, E_Package); - Set_Etype (Renaming_In_Par, Standard_Void_Type); - Set_Scope (Renaming_In_Par, Parent_Instance); - Set_Parent (Renaming_In_Par, Parent (Formal)); - Set_Renamed_Object (Renaming_In_Par, Formal); - Append_Entity (Renaming_In_Par, Parent_Instance); - end if; - - Analyze_Generic_Formal_Part (N); - Analyze (Specification (N)); - End_Package_Scope (Formal); - - if Parent_Installed then - Remove_Parent; - end if; - - Restore_Env; - - -- Inside the generic unit, the formal package is a regular - -- package, but no body is needed for it. Note that after - -- instantiation, the defining_unit_name we need is in the - -- new tree and not in the original. (see Package_Instantiation). - -- A generic formal package is an instance, and can be used as - -- an actual for an inner instance. - - Set_Ekind (Formal, E_Package); - Set_Has_Completion (Formal, True); - - Set_Ekind (Pack_Id, E_Package); - Set_Etype (Pack_Id, Standard_Void_Type); - Set_Scope (Pack_Id, Scope (Formal)); - Set_Has_Completion (Pack_Id, True); - end if; - end Analyze_Formal_Package; - - --------------------------------- - -- Analyze_Formal_Private_Type -- - --------------------------------- - - procedure Analyze_Formal_Private_Type - (N : Node_Id; - T : Entity_Id; - Def : Node_Id) - is - begin - New_Private_Type (N, T, Def); - - -- Set the size to an arbitrary but legal value - - Set_Size_Info (T, Standard_Integer); - Set_RM_Size (T, RM_Size (Standard_Integer)); - end Analyze_Formal_Private_Type; - - ---------------------------------------- - -- Analyze_Formal_Signed_Integer_Type -- - ---------------------------------------- - - procedure Analyze_Formal_Signed_Integer_Type - (T : Entity_Id; - Def : Node_Id) - is - Base : constant Entity_Id := - New_Internal_Entity - (E_Signed_Integer_Type, Current_Scope, Sloc (Def), 'G'); - - begin - Enter_Name (T); - - Set_Ekind (T, E_Signed_Integer_Subtype); - Set_Etype (T, Base); - Set_Size_Info (T, Standard_Integer); - Set_RM_Size (T, RM_Size (Standard_Integer)); - Set_Scalar_Range (T, Scalar_Range (Standard_Integer)); - Set_Is_Constrained (T); - - Set_Is_Generic_Type (Base); - Set_Size_Info (Base, Standard_Integer); - Set_RM_Size (Base, RM_Size (Standard_Integer)); - Set_Etype (Base, Base); - Set_Scalar_Range (Base, Scalar_Range (Standard_Integer)); - Set_Parent (Base, Parent (Def)); - end Analyze_Formal_Signed_Integer_Type; - - ------------------------------- - -- Analyze_Formal_Subprogram -- - ------------------------------- - - procedure Analyze_Formal_Subprogram (N : Node_Id) is - Spec : constant Node_Id := Specification (N); - Def : constant Node_Id := Default_Name (N); - Nam : constant Entity_Id := Defining_Unit_Name (Spec); - Subp : Entity_Id; - - begin - if Nam = Error then - return; - end if; - - if Nkind (Nam) = N_Defining_Program_Unit_Name then - Error_Msg_N ("name of formal subprogram must be a direct name", Nam); - return; - end if; - - Analyze_Subprogram_Declaration (N); - Set_Is_Formal_Subprogram (Nam); - Set_Has_Completion (Nam); - - if Nkind (N) = N_Formal_Abstract_Subprogram_Declaration then - Set_Is_Abstract (Nam); - Set_Is_Dispatching_Operation (Nam); - - declare - Ctrl_Type : constant Entity_Id := Find_Dispatching_Type (Nam); - - begin - if No (Ctrl_Type) then - Error_Msg_N - ("abstract formal subprogram must have a controlling type", - N); - - else - Check_Controlling_Formals (Ctrl_Type, Nam); - end if; - end; - end if; - - -- Default name is resolved at the point of instantiation - - if Box_Present (N) then - null; - - -- Else default is bound at the point of generic declaration - - elsif Present (Def) then - if Nkind (Def) = N_Operator_Symbol then - Find_Direct_Name (Def); - - elsif Nkind (Def) /= N_Attribute_Reference then - Analyze (Def); - - else - -- For an attribute reference, analyze the prefix and verify - -- that it has the proper profile for the subprogram. - - Analyze (Prefix (Def)); - Valid_Default_Attribute (Nam, Def); - return; - end if; - - -- Default name may be overloaded, in which case the interpretation - -- with the correct profile must be selected, as for a renaming. - - if Etype (Def) = Any_Type then - return; - - elsif Nkind (Def) = N_Selected_Component then - Subp := Entity (Selector_Name (Def)); - - if Ekind (Subp) /= E_Entry then - Error_Msg_N ("expect valid subprogram name as default", Def); - return; - end if; - - elsif Nkind (Def) = N_Indexed_Component then - - if Nkind (Prefix (Def)) /= N_Selected_Component then - Error_Msg_N ("expect valid subprogram name as default", Def); - return; - - else - Subp := Entity (Selector_Name (Prefix (Def))); - - if Ekind (Subp) /= E_Entry_Family then - Error_Msg_N ("expect valid subprogram name as default", Def); - return; - end if; - end if; - - elsif Nkind (Def) = N_Character_Literal then - - -- Needs some type checks: subprogram should be parameterless??? - - Resolve (Def, (Etype (Nam))); - - elsif not Is_Entity_Name (Def) - or else not Is_Overloadable (Entity (Def)) - then - Error_Msg_N ("expect valid subprogram name as default", Def); - return; - - elsif not Is_Overloaded (Def) then - Subp := Entity (Def); - - if Subp = Nam then - Error_Msg_N ("premature usage of formal subprogram", Def); - - elsif not Entity_Matches_Spec (Subp, Nam) then - Error_Msg_N ("no visible entity matches specification", Def); - end if; - - else - declare - I : Interp_Index; - I1 : Interp_Index := 0; - It : Interp; - It1 : Interp; - - begin - Subp := Any_Id; - Get_First_Interp (Def, I, It); - while Present (It.Nam) loop - - if Entity_Matches_Spec (It.Nam, Nam) then - if Subp /= Any_Id then - It1 := Disambiguate (Def, I1, I, Etype (Subp)); - - if It1 = No_Interp then - Error_Msg_N ("ambiguous default subprogram", Def); - else - Subp := It1.Nam; - end if; - - exit; - - else - I1 := I; - Subp := It.Nam; - end if; - end if; - - Get_Next_Interp (I, It); - end loop; - end; - - if Subp /= Any_Id then - Set_Entity (Def, Subp); - - if Subp = Nam then - Error_Msg_N ("premature usage of formal subprogram", Def); - - elsif Ekind (Subp) /= E_Operator then - Check_Mode_Conformant (Subp, Nam); - end if; - - else - Error_Msg_N ("no visible subprogram matches specification", N); - end if; - end if; - end if; - end Analyze_Formal_Subprogram; - - ------------------------------------- - -- Analyze_Formal_Type_Declaration -- - ------------------------------------- - - procedure Analyze_Formal_Type_Declaration (N : Node_Id) is - Def : constant Node_Id := Formal_Type_Definition (N); - T : Entity_Id; - - begin - T := Defining_Identifier (N); - - if Present (Discriminant_Specifications (N)) - and then Nkind (Def) /= N_Formal_Private_Type_Definition - then - Error_Msg_N - ("discriminants not allowed for this formal type", - Defining_Identifier (First (Discriminant_Specifications (N)))); - end if; - - -- Enter the new name, and branch to specific routine - - case Nkind (Def) is - when N_Formal_Private_Type_Definition => - Analyze_Formal_Private_Type (N, T, Def); - - when N_Formal_Derived_Type_Definition => - Analyze_Formal_Derived_Type (N, T, Def); - - when N_Formal_Discrete_Type_Definition => - Analyze_Formal_Discrete_Type (T, Def); - - when N_Formal_Signed_Integer_Type_Definition => - Analyze_Formal_Signed_Integer_Type (T, Def); - - when N_Formal_Modular_Type_Definition => - Analyze_Formal_Modular_Type (T, Def); - - when N_Formal_Floating_Point_Definition => - Analyze_Formal_Floating_Type (T, Def); - - when N_Formal_Ordinary_Fixed_Point_Definition => - Analyze_Formal_Ordinary_Fixed_Point_Type (T, Def); - - when N_Formal_Decimal_Fixed_Point_Definition => - Analyze_Formal_Decimal_Fixed_Point_Type (T, Def); - - when N_Array_Type_Definition => - Analyze_Formal_Array_Type (T, Def); - - when N_Access_To_Object_Definition | - N_Access_Function_Definition | - N_Access_Procedure_Definition => - Analyze_Generic_Access_Type (T, Def); - - -- Ada 2005: a interface declaration is encoded as an abstract - -- record declaration or a abstract type derivation. - - when N_Record_Definition => - Analyze_Formal_Interface_Type (T, Def); - - when N_Derived_Type_Definition => - Analyze_Formal_Derived_Interface_Type (T, Def); - - when N_Error => - null; - - when others => - raise Program_Error; - - end case; - - Set_Is_Generic_Type (T); - end Analyze_Formal_Type_Declaration; - - ------------------------------------ - -- Analyze_Function_Instantiation -- - ------------------------------------ - - procedure Analyze_Function_Instantiation (N : Node_Id) is - begin - Analyze_Subprogram_Instantiation (N, E_Function); - end Analyze_Function_Instantiation; - - --------------------------------- - -- Analyze_Generic_Access_Type -- - --------------------------------- - - procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id) is - begin - Enter_Name (T); - - if Nkind (Def) = N_Access_To_Object_Definition then - Access_Type_Declaration (T, Def); - - if Is_Incomplete_Or_Private_Type (Designated_Type (T)) - and then No (Full_View (Designated_Type (T))) - and then not Is_Generic_Type (Designated_Type (T)) - then - Error_Msg_N ("premature usage of incomplete type", Def); - - elsif Is_Internal (Designated_Type (T)) then - Error_Msg_N - ("only a subtype mark is allowed in a formal", Def); - end if; - - else - Access_Subprogram_Declaration (T, Def); - end if; - end Analyze_Generic_Access_Type; - - --------------------------------- - -- Analyze_Generic_Formal_Part -- - --------------------------------- - - procedure Analyze_Generic_Formal_Part (N : Node_Id) is - Gen_Parm_Decl : Node_Id; - - begin - -- The generic formals are processed in the scope of the generic - -- unit, where they are immediately visible. The scope is installed - -- by the caller. - - Gen_Parm_Decl := First (Generic_Formal_Declarations (N)); - - while Present (Gen_Parm_Decl) loop - Analyze (Gen_Parm_Decl); - Next (Gen_Parm_Decl); - end loop; - - Generate_Reference_To_Generic_Formals (Current_Scope); - end Analyze_Generic_Formal_Part; - - ------------------------------------------ - -- Analyze_Generic_Package_Declaration -- - ------------------------------------------ - - procedure Analyze_Generic_Package_Declaration (N : Node_Id) is - Loc : constant Source_Ptr := Sloc (N); - Id : Entity_Id; - New_N : Node_Id; - Save_Parent : Node_Id; - Renaming : Node_Id; - Decls : constant List_Id := - Visible_Declarations (Specification (N)); - Decl : Node_Id; - - begin - -- We introduce a renaming of the enclosing package, to have a usable - -- entity as the prefix of an expanded name for a local entity of the - -- form Par.P.Q, where P is the generic package. This is because a local - -- entity named P may hide it, so that the usual visibility rules in - -- the instance will not resolve properly. - - Renaming := - Make_Package_Renaming_Declaration (Loc, - Defining_Unit_Name => - Make_Defining_Identifier (Loc, - Chars => New_External_Name (Chars (Defining_Entity (N)), "GH")), - Name => Make_Identifier (Loc, Chars (Defining_Entity (N)))); - - if Present (Decls) then - Decl := First (Decls); - while Present (Decl) - and then Nkind (Decl) = N_Pragma - loop - Next (Decl); - end loop; - - if Present (Decl) then - Insert_Before (Decl, Renaming); - else - Append (Renaming, Visible_Declarations (Specification (N))); - end if; - - else - Set_Visible_Declarations (Specification (N), New_List (Renaming)); - end if; - - -- Create copy of generic unit, and save for instantiation. - -- If the unit is a child unit, do not copy the specifications - -- for the parent, which are not part of the generic tree. - - Save_Parent := Parent_Spec (N); - Set_Parent_Spec (N, Empty); - - New_N := Copy_Generic_Node (N, Empty, Instantiating => False); - Set_Parent_Spec (New_N, Save_Parent); - Rewrite (N, New_N); - Id := Defining_Entity (N); - Generate_Definition (Id); - - -- Expansion is not applied to generic units - - Start_Generic; - - Enter_Name (Id); - Set_Ekind (Id, E_Generic_Package); - Set_Etype (Id, Standard_Void_Type); - New_Scope (Id); - Enter_Generic_Scope (Id); - Set_Inner_Instances (Id, New_Elmt_List); - - Set_Categorization_From_Pragmas (N); - Set_Is_Pure (Id, Is_Pure (Current_Scope)); - - -- Link the declaration of the generic homonym in the generic copy - -- to the package it renames, so that it is always resolved properly. - - Set_Generic_Homonym (Id, Defining_Unit_Name (Renaming)); - Set_Entity (Associated_Node (Name (Renaming)), Id); - - -- For a library unit, we have reconstructed the entity for the - -- unit, and must reset it in the library tables. - - if Nkind (Parent (N)) = N_Compilation_Unit then - Set_Cunit_Entity (Current_Sem_Unit, Id); - end if; - - Analyze_Generic_Formal_Part (N); - - -- After processing the generic formals, analysis proceeds - -- as for a non-generic package. - - Analyze (Specification (N)); - - Validate_Categorization_Dependency (N, Id); - - End_Generic; - - End_Package_Scope (Id); - Exit_Generic_Scope (Id); - - if Nkind (Parent (N)) /= N_Compilation_Unit then - Move_Freeze_Nodes (Id, N, Visible_Declarations (Specification (N))); - Move_Freeze_Nodes (Id, N, Private_Declarations (Specification (N))); - Move_Freeze_Nodes (Id, N, Generic_Formal_Declarations (N)); - - else - Set_Body_Required (Parent (N), Unit_Requires_Body (Id)); - Validate_RT_RAT_Component (N); - - -- If this is a spec without a body, check that generic parameters - -- are referenced. - - if not Body_Required (Parent (N)) then - Check_References (Id); - end if; - end if; - end Analyze_Generic_Package_Declaration; - - -------------------------------------------- - -- Analyze_Generic_Subprogram_Declaration -- - -------------------------------------------- - - procedure Analyze_Generic_Subprogram_Declaration (N : Node_Id) is - Spec : Node_Id; - Id : Entity_Id; - Formals : List_Id; - New_N : Node_Id; - Result_Type : Entity_Id; - Save_Parent : Node_Id; - - begin - -- Create copy of generic unit,and save for instantiation. - -- If the unit is a child unit, do not copy the specifications - -- for the parent, which are not part of the generic tree. - - Save_Parent := Parent_Spec (N); - Set_Parent_Spec (N, Empty); - - New_N := Copy_Generic_Node (N, Empty, Instantiating => False); - Set_Parent_Spec (New_N, Save_Parent); - Rewrite (N, New_N); - - Spec := Specification (N); - Id := Defining_Entity (Spec); - Generate_Definition (Id); - - if Nkind (Id) = N_Defining_Operator_Symbol then - Error_Msg_N - ("operator symbol not allowed for generic subprogram", Id); - end if; - - Start_Generic; - - Enter_Name (Id); - - Set_Scope_Depth_Value (Id, Scope_Depth (Current_Scope) + 1); - New_Scope (Id); - Enter_Generic_Scope (Id); - Set_Inner_Instances (Id, New_Elmt_List); - Set_Is_Pure (Id, Is_Pure (Current_Scope)); - - Analyze_Generic_Formal_Part (N); - - Formals := Parameter_Specifications (Spec); - - if Present (Formals) then - Process_Formals (Formals, Spec); - end if; - - if Nkind (Spec) = N_Function_Specification then - Set_Ekind (Id, E_Generic_Function); - - if Nkind (Result_Definition (Spec)) = N_Access_Definition then - Result_Type := Access_Definition (Spec, Result_Definition (Spec)); - Set_Etype (Id, Result_Type); - else - Find_Type (Result_Definition (Spec)); - Set_Etype (Id, Entity (Result_Definition (Spec))); - end if; - - else - Set_Ekind (Id, E_Generic_Procedure); - Set_Etype (Id, Standard_Void_Type); - end if; - - -- For a library unit, we have reconstructed the entity for the unit, - -- and must reset it in the library tables. We also make sure that - -- Body_Required is set properly in the original compilation unit node. - - if Nkind (Parent (N)) = N_Compilation_Unit then - Set_Cunit_Entity (Current_Sem_Unit, Id); - Set_Body_Required (Parent (N), Unit_Requires_Body (Id)); - end if; - - Set_Categorization_From_Pragmas (N); - Validate_Categorization_Dependency (N, Id); - - Save_Global_References (Original_Node (N)); - - End_Generic; - End_Scope; - Exit_Generic_Scope (Id); - Generate_Reference_To_Formals (Id); - end Analyze_Generic_Subprogram_Declaration; - - ----------------------------------- - -- Analyze_Package_Instantiation -- - ----------------------------------- - - -- Note: this procedure is also used for formal package declarations, in - -- which case the argument N is an N_Formal_Package_Declaration node. - -- This should really be noted in the spec! ??? - - procedure Analyze_Package_Instantiation (N : Node_Id) is - Loc : constant Source_Ptr := Sloc (N); - Gen_Id : constant Node_Id := Name (N); - - Act_Decl : Node_Id; - Act_Decl_Name : Node_Id; - Act_Decl_Id : Entity_Id; - Act_Spec : Node_Id; - Act_Tree : Node_Id; - - Gen_Decl : Node_Id; - Gen_Unit : Entity_Id; - - Is_Actual_Pack : constant Boolean := - Is_Internal (Defining_Entity (N)); - - Env_Installed : Boolean := False; - Parent_Installed : Boolean := False; - Renaming_List : List_Id; - Unit_Renaming : Node_Id; - Needs_Body : Boolean; - Inline_Now : Boolean := False; - - procedure Delay_Descriptors (E : Entity_Id); - -- Delay generation of subprogram descriptors for given entity - - function Might_Inline_Subp return Boolean; - -- If inlining is active and the generic contains inlined subprograms, - -- we instantiate the body. This may cause superfluous instantiations, - -- but it is simpler than detecting the need for the body at the point - -- of inlining, when the context of the instance is not available. - - ----------------------- - -- Delay_Descriptors -- - ----------------------- - - procedure Delay_Descriptors (E : Entity_Id) is - begin - if not Delay_Subprogram_Descriptors (E) then - Set_Delay_Subprogram_Descriptors (E); - Pending_Descriptor.Increment_Last; - Pending_Descriptor.Table (Pending_Descriptor.Last) := E; - end if; - end Delay_Descriptors; - - ----------------------- - -- Might_Inline_Subp -- - ----------------------- - - function Might_Inline_Subp return Boolean is - E : Entity_Id; - - begin - if not Inline_Processing_Required then - return False; - - else - E := First_Entity (Gen_Unit); - while Present (E) loop - if Is_Subprogram (E) - and then Is_Inlined (E) - then - return True; - end if; - - Next_Entity (E); - end loop; - end if; - - return False; - end Might_Inline_Subp; - - -- Start of processing for Analyze_Package_Instantiation - - begin - -- Very first thing: apply the special kludge for Text_IO processing - -- in case we are instantiating one of the children of [Wide_]Text_IO. - - Text_IO_Kludge (Name (N)); - - -- Make node global for error reporting - - Instantiation_Node := N; - - -- Case of instantiation of a generic package - - if Nkind (N) = N_Package_Instantiation then - Act_Decl_Id := New_Copy (Defining_Entity (N)); - Set_Comes_From_Source (Act_Decl_Id, True); - - if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name then - Act_Decl_Name := - Make_Defining_Program_Unit_Name (Loc, - Name => New_Copy_Tree (Name (Defining_Unit_Name (N))), - Defining_Identifier => Act_Decl_Id); - else - Act_Decl_Name := Act_Decl_Id; - end if; - - -- Case of instantiation of a formal package - - else - Act_Decl_Id := Defining_Identifier (N); - Act_Decl_Name := Act_Decl_Id; - end if; - - Generate_Definition (Act_Decl_Id); - Pre_Analyze_Actuals (N); - - Init_Env; - Env_Installed := True; - Check_Generic_Child_Unit (Gen_Id, Parent_Installed); - Gen_Unit := Entity (Gen_Id); - - -- Verify that it is the name of a generic package - - if Etype (Gen_Unit) = Any_Type then - Restore_Env; - return; - - elsif Ekind (Gen_Unit) /= E_Generic_Package then - - -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause - - if From_With_Type (Gen_Unit) then - Error_Msg_N - ("cannot instantiate a limited withed package", Gen_Id); - else - Error_Msg_N - ("expect name of generic package in instantiation", Gen_Id); - end if; - - Restore_Env; - return; - end if; - - if In_Extended_Main_Source_Unit (N) then - Set_Is_Instantiated (Gen_Unit); - Generate_Reference (Gen_Unit, N); - - if Present (Renamed_Object (Gen_Unit)) then - Set_Is_Instantiated (Renamed_Object (Gen_Unit)); - Generate_Reference (Renamed_Object (Gen_Unit), N); - end if; - end if; - - if Nkind (Gen_Id) = N_Identifier - and then Chars (Gen_Unit) = Chars (Defining_Entity (N)) - then - Error_Msg_NE - ("& is hidden within declaration of instance", Gen_Id, Gen_Unit); - - elsif Nkind (Gen_Id) = N_Expanded_Name - and then Is_Child_Unit (Gen_Unit) - and then Nkind (Prefix (Gen_Id)) = N_Identifier - and then Chars (Act_Decl_Id) = Chars (Prefix (Gen_Id)) - then - Error_Msg_N - ("& is hidden within declaration of instance ", Prefix (Gen_Id)); - end if; - - Set_Entity (Gen_Id, Gen_Unit); - - -- If generic is a renaming, get original generic unit - - if Present (Renamed_Object (Gen_Unit)) - and then Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Package - then - Gen_Unit := Renamed_Object (Gen_Unit); - end if; - - -- Verify that there are no circular instantiations - - if In_Open_Scopes (Gen_Unit) then - Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit); - Restore_Env; - return; - - elsif Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then - Error_Msg_Node_2 := Current_Scope; - Error_Msg_NE - ("circular Instantiation: & instantiated in &!", N, Gen_Unit); - Circularity_Detected := True; - Restore_Env; - return; - - else - Set_Instance_Env (Gen_Unit, Act_Decl_Id); - Gen_Decl := Unit_Declaration_Node (Gen_Unit); - - -- Initialize renamings map, for error checking, and the list - -- that holds private entities whose views have changed between - -- generic definition and instantiation. If this is the instance - -- created to validate an actual package, the instantiation - -- environment is that of the enclosing instance. - - Generic_Renamings.Set_Last (0); - Generic_Renamings_HTable.Reset; - - Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment); - - -- Copy original generic tree, to produce text for instantiation - - Act_Tree := - Copy_Generic_Node - (Original_Node (Gen_Decl), Empty, Instantiating => True); - - Act_Spec := Specification (Act_Tree); - - -- If this is the instance created to validate an actual package, - -- only the formals matter, do not examine the package spec itself. - - if Is_Actual_Pack then - Set_Visible_Declarations (Act_Spec, New_List); - Set_Private_Declarations (Act_Spec, New_List); - end if; - - Renaming_List := - Analyze_Associations - (N, - Generic_Formal_Declarations (Act_Tree), - Generic_Formal_Declarations (Gen_Decl)); - - Set_Defining_Unit_Name (Act_Spec, Act_Decl_Name); - Set_Is_Generic_Instance (Act_Decl_Id); - - Set_Generic_Parent (Act_Spec, Gen_Unit); - - -- References to the generic in its own declaration or its body - -- are references to the instance. Add a renaming declaration for - -- the generic unit itself. This declaration, as well as the renaming - -- declarations for the generic formals, must remain private to the - -- unit: the formals, because this is the language semantics, and - -- the unit because its use is an artifact of the implementation. - - Unit_Renaming := - Make_Package_Renaming_Declaration (Loc, - Defining_Unit_Name => - Make_Defining_Identifier (Loc, Chars (Gen_Unit)), - Name => New_Reference_To (Act_Decl_Id, Loc)); - - Append (Unit_Renaming, Renaming_List); - - -- The renaming declarations are the first local declarations of - -- the new unit. - - if Is_Non_Empty_List (Visible_Declarations (Act_Spec)) then - Insert_List_Before - (First (Visible_Declarations (Act_Spec)), Renaming_List); - else - Set_Visible_Declarations (Act_Spec, Renaming_List); - end if; - - Act_Decl := - Make_Package_Declaration (Loc, - Specification => Act_Spec); - - -- Save the instantiation node, for subsequent instantiation - -- of the body, if there is one and we are generating code for - -- the current unit. Mark the unit as having a body, to avoid - -- a premature error message. - - -- We instantiate the body if we are generating code, if we are - -- generating cross-reference information, or if we are building - -- trees for ASIS use. - - declare - Enclosing_Body_Present : Boolean := False; - -- If the generic unit is not a compilation unit, then a body - -- may be present in its parent even if none is required. We - -- create a tentative pending instantiation for the body, which - -- will be discarded if none is actually present. - - Scop : Entity_Id; - - begin - if Scope (Gen_Unit) /= Standard_Standard - and then not Is_Child_Unit (Gen_Unit) - then - Scop := Scope (Gen_Unit); - - while Present (Scop) - and then Scop /= Standard_Standard - loop - if Unit_Requires_Body (Scop) then - Enclosing_Body_Present := True; - exit; - - elsif In_Open_Scopes (Scop) - and then In_Package_Body (Scop) - then - Enclosing_Body_Present := True; - exit; - end if; - - exit when Is_Compilation_Unit (Scop); - Scop := Scope (Scop); - end loop; - end if; - - -- If front-end inlining is enabled, and this is a unit for which - -- code will be generated, we instantiate the body at once. - -- This is done if the instance is not the main unit, and if the - -- generic is not a child unit of another generic, to avoid scope - -- problems and the reinstallation of parent instances. - - if Expander_Active - and then (not Is_Child_Unit (Gen_Unit) - or else not Is_Generic_Unit (Scope (Gen_Unit))) - and then Might_Inline_Subp - and then not Is_Actual_Pack - then - if Front_End_Inlining - and then (Is_In_Main_Unit (N) - or else In_Main_Context (Current_Scope)) - and then Nkind (Parent (N)) /= N_Compilation_Unit - then - Inline_Now := True; - - -- In configurable_run_time mode we force the inlining of - -- predefined subprogram marked Inline_Always, to minimize - -- the use of the run-time library. - - elsif Is_Predefined_File_Name - (Unit_File_Name (Get_Source_Unit (Gen_Decl))) - and then Configurable_Run_Time_Mode - and then Nkind (Parent (N)) /= N_Compilation_Unit - then - Inline_Now := True; - end if; - - -- If the current scope is itself an instance within a child - -- unit,there will be duplications in the scope stack, and the - -- unstacking mechanism in Inline_Instance_Body will fail. - -- This loses some rare cases of optimization, and might be - -- improved some day, if we can find a proper abstraction for - -- "the complete compilation context" that can be saved and - -- restored ??? - - if Is_Generic_Instance (Current_Scope) then - declare - Curr_Unit : constant Entity_Id := - Cunit_Entity (Current_Sem_Unit); - begin - if Curr_Unit /= Current_Scope - and then Is_Child_Unit (Curr_Unit) - then - Inline_Now := False; - end if; - end; - end if; - end if; - - Needs_Body := - (Unit_Requires_Body (Gen_Unit) - or else Enclosing_Body_Present - or else Present (Corresponding_Body (Gen_Decl))) - and then (Is_In_Main_Unit (N) - or else Might_Inline_Subp) - and then not Is_Actual_Pack - and then not Inline_Now - and then (Operating_Mode = Generate_Code - or else (Operating_Mode = Check_Semantics - and then ASIS_Mode)); - - -- If front_end_inlining is enabled, do not instantiate a - -- body if within a generic context. - - if (Front_End_Inlining - and then not Expander_Active) - or else Is_Generic_Unit (Cunit_Entity (Main_Unit)) - then - Needs_Body := False; - end if; - - -- If the current context is generic, and the package being - -- instantiated is declared within a formal package, there is no - -- body to instantiate until the enclosing generic is instantiated - -- and there is an actual for the formal package. If the formal - -- package has parameters, we build regular package instance for - -- it, that preceeds the original formal package declaration. - - if In_Open_Scopes (Scope (Scope (Gen_Unit))) then - declare - Decl : constant Node_Id := - Original_Node - (Unit_Declaration_Node (Scope (Gen_Unit))); - begin - if Nkind (Decl) = N_Formal_Package_Declaration - or else (Nkind (Decl) = N_Package_Declaration - and then Is_List_Member (Decl) - and then Present (Next (Decl)) - and then - Nkind (Next (Decl)) = N_Formal_Package_Declaration) - then - Needs_Body := False; - end if; - end; - end if; - end; - - -- If we are generating the calling stubs from the instantiation of - -- a generic RCI package, we will not use the body of the generic - -- package. - - if Distribution_Stub_Mode = Generate_Caller_Stub_Body - and then Is_Compilation_Unit (Defining_Entity (N)) - then - Needs_Body := False; - end if; - - if Needs_Body then - - -- Here is a defence against a ludicrous number of instantiations - -- caused by a circular set of instantiation attempts. - - if Pending_Instantiations.Last > - Hostparm.Max_Instantiations - then - Error_Msg_N ("too many instantiations", N); - raise Unrecoverable_Error; - end if; - - -- Indicate that the enclosing scopes contain an instantiation, - -- and that cleanup actions should be delayed until after the - -- instance body is expanded. - - Check_Forward_Instantiation (Gen_Decl); - if Nkind (N) = N_Package_Instantiation then - declare - Enclosing_Master : Entity_Id := Current_Scope; - - begin - while Enclosing_Master /= Standard_Standard loop - - if Ekind (Enclosing_Master) = E_Package then - if Is_Compilation_Unit (Enclosing_Master) then - if In_Package_Body (Enclosing_Master) then - Delay_Descriptors - (Body_Entity (Enclosing_Master)); - else - Delay_Descriptors - (Enclosing_Master); - end if; - - exit; - - else - Enclosing_Master := Scope (Enclosing_Master); - end if; - - elsif Ekind (Enclosing_Master) = E_Generic_Package then - Enclosing_Master := Scope (Enclosing_Master); - - elsif Is_Generic_Subprogram (Enclosing_Master) - or else Ekind (Enclosing_Master) = E_Void - then - -- Cleanup actions will eventually be performed on - -- the enclosing instance, if any. enclosing scope - -- is void in the formal part of a generic subp. - - exit; - - else - if Ekind (Enclosing_Master) = E_Entry - and then - Ekind (Scope (Enclosing_Master)) = E_Protected_Type - then - Enclosing_Master := - Protected_Body_Subprogram (Enclosing_Master); - end if; - - Set_Delay_Cleanups (Enclosing_Master); - - while Ekind (Enclosing_Master) = E_Block loop - Enclosing_Master := Scope (Enclosing_Master); - end loop; - - if Is_Subprogram (Enclosing_Master) then - Delay_Descriptors (Enclosing_Master); - - elsif Is_Task_Type (Enclosing_Master) then - declare - TBP : constant Node_Id := - Get_Task_Body_Procedure - (Enclosing_Master); - - begin - if Present (TBP) then - Delay_Descriptors (TBP); - Set_Delay_Cleanups (TBP); - end if; - end; - end if; - - exit; - end if; - end loop; - end; - - -- Make entry in table - - Pending_Instantiations.Increment_Last; - Pending_Instantiations.Table (Pending_Instantiations.Last) := - (N, Act_Decl, Expander_Active, Current_Sem_Unit); - end if; - end if; - - Set_Categorization_From_Pragmas (Act_Decl); - - if Parent_Installed then - Hide_Current_Scope; - end if; - - Set_Instance_Spec (N, Act_Decl); - - -- If not a compilation unit, insert the package declaration - -- before the original instantiation node. - - if Nkind (Parent (N)) /= N_Compilation_Unit then - Mark_Rewrite_Insertion (Act_Decl); - Insert_Before (N, Act_Decl); - Analyze (Act_Decl); - - -- For an instantiation that is a compilation unit, place - -- declaration on current node so context is complete - -- for analysis (including nested instantiations). It this - -- is the main unit, the declaration eventually replaces the - -- instantiation node. If the instance body is later created, it - -- replaces the instance node, and the declation is attached to - -- it (see Build_Instance_Compilation_Unit_Nodes). - - else - if Cunit_Entity (Current_Sem_Unit) = Defining_Entity (N) then - - -- The entity for the current unit is the newly created one, - -- and all semantic information is attached to it. - - Set_Cunit_Entity (Current_Sem_Unit, Act_Decl_Id); - - -- If this is the main unit, replace the main entity as well - - if Current_Sem_Unit = Main_Unit then - Main_Unit_Entity := Act_Decl_Id; - end if; - end if; - - -- There is a problem with inlining here - -- More comments needed??? what problem - - Set_Unit (Parent (N), Act_Decl); - Set_Parent_Spec (Act_Decl, Parent_Spec (N)); - Set_Package_Instantiation (Act_Decl_Id, N); - Analyze (Act_Decl); - Set_Unit (Parent (N), N); - Set_Body_Required (Parent (N), False); - - -- We never need elaboration checks on instantiations, since - -- by definition, the body instantiation is elaborated at the - -- same time as the spec instantiation. - - Set_Suppress_Elaboration_Warnings (Act_Decl_Id); - Set_Kill_Elaboration_Checks (Act_Decl_Id); - end if; - - Check_Elab_Instantiation (N); - - if ABE_Is_Certain (N) and then Needs_Body then - Pending_Instantiations.Decrement_Last; - end if; - Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id); - - Set_First_Private_Entity (Defining_Unit_Name (Unit_Renaming), - First_Private_Entity (Act_Decl_Id)); - - -- If the instantiation will receive a body, the unit will - -- be transformed into a package body, and receive its own - -- elaboration entity. Otherwise, the nature of the unit is - -- now a package declaration. - - if Nkind (Parent (N)) = N_Compilation_Unit - and then not Needs_Body - then - Rewrite (N, Act_Decl); - end if; - - if Present (Corresponding_Body (Gen_Decl)) - or else Unit_Requires_Body (Gen_Unit) - then - Set_Has_Completion (Act_Decl_Id); - end if; - - Check_Formal_Packages (Act_Decl_Id); - - Restore_Private_Views (Act_Decl_Id); - - if not Generic_Separately_Compiled (Gen_Unit) then - Inherit_Context (Gen_Decl, N); - end if; - - if Parent_Installed then - Remove_Parent; - end if; - - Restore_Env; - Env_Installed := False; - end if; - - Validate_Categorization_Dependency (N, Act_Decl_Id); - - -- Check restriction, but skip this if something went wrong in - -- the above analysis, indicated by Act_Decl_Id being void. - - if Ekind (Act_Decl_Id) /= E_Void - and then not Is_Library_Level_Entity (Act_Decl_Id) - then - Check_Restriction (No_Local_Allocators, N); - end if; - - if Inline_Now then - Inline_Instance_Body (N, Gen_Unit, Act_Decl); - end if; - - -- The following is a tree patch for ASIS: ASIS needs separate nodes - -- to be used as defining identifiers for a formal package and for the - -- corresponding expanded package - - if Nkind (N) = N_Formal_Package_Declaration then - Act_Decl_Id := New_Copy (Defining_Entity (N)); - Set_Comes_From_Source (Act_Decl_Id, True); - Set_Is_Generic_Instance (Act_Decl_Id, False); - Set_Defining_Identifier (N, Act_Decl_Id); - end if; - - exception - when Instantiation_Error => - if Parent_Installed then - Remove_Parent; - end if; - - if Env_Installed then - Restore_Env; - end if; - end Analyze_Package_Instantiation; - - -------------------------- - -- Inline_Instance_Body -- - -------------------------- - - procedure Inline_Instance_Body - (N : Node_Id; - Gen_Unit : Entity_Id; - Act_Decl : Node_Id) - is - Vis : Boolean; - Gen_Comp : constant Entity_Id := - Cunit_Entity (Get_Source_Unit (Gen_Unit)); - Curr_Comp : constant Node_Id := Cunit (Current_Sem_Unit); - Curr_Scope : Entity_Id := Empty; - Curr_Unit : constant Entity_Id := - Cunit_Entity (Current_Sem_Unit); - Removed : Boolean := False; - Num_Scopes : Int := 0; - - Scope_Stack_Depth : constant Int := - Scope_Stack.Last - Scope_Stack.First + 1; - - Use_Clauses : array (1 .. Scope_Stack_Depth) of Node_Id; - Instances : array (1 .. Scope_Stack_Depth) of Entity_Id; - Inner_Scopes : array (1 .. Scope_Stack_Depth) of Entity_Id; - Num_Inner : Int := 0; - N_Instances : Int := 0; - S : Entity_Id; - - begin - -- Case of generic unit defined in another unit. We must remove the - -- complete context of the current unit to install that of the generic. - - if Gen_Comp /= Cunit_Entity (Current_Sem_Unit) then - - -- Add some comments for the following two loops ??? - - S := Current_Scope; - while Present (S) and then S /= Standard_Standard loop - loop - Num_Scopes := Num_Scopes + 1; - - Use_Clauses (Num_Scopes) := - (Scope_Stack.Table - (Scope_Stack.Last - Num_Scopes + 1). - First_Use_Clause); - End_Use_Clauses (Use_Clauses (Num_Scopes)); - - exit when Scope_Stack.Last - Num_Scopes + 1 = Scope_Stack.First - or else Scope_Stack.Table - (Scope_Stack.Last - Num_Scopes).Entity - = Scope (S); - end loop; - - exit when Is_Generic_Instance (S) - and then (In_Package_Body (S) - or else Ekind (S) = E_Procedure - or else Ekind (S) = E_Function); - S := Scope (S); - end loop; - - Vis := Is_Immediately_Visible (Gen_Comp); - - -- Find and save all enclosing instances - - S := Current_Scope; - - while Present (S) - and then S /= Standard_Standard - loop - if Is_Generic_Instance (S) then - N_Instances := N_Instances + 1; - Instances (N_Instances) := S; - - exit when In_Package_Body (S); - end if; - - S := Scope (S); - end loop; - - -- Remove context of current compilation unit, unless we are within a - -- nested package instantiation, in which case the context has been - -- removed previously. - - -- If current scope is the body of a child unit, remove context of - -- spec as well. - - S := Current_Scope; - - while Present (S) - and then S /= Standard_Standard - loop - exit when Is_Generic_Instance (S) - and then (In_Package_Body (S) - or else Ekind (S) = E_Procedure - or else Ekind (S) = E_Function); - - if S = Curr_Unit - or else (Ekind (Curr_Unit) = E_Package_Body - and then S = Spec_Entity (Curr_Unit)) - or else (Ekind (Curr_Unit) = E_Subprogram_Body - and then S = - Corresponding_Spec - (Unit_Declaration_Node (Curr_Unit))) - then - Removed := True; - - -- Remove entities in current scopes from visibility, so - -- that instance body is compiled in a clean environment. - - Save_Scope_Stack (Handle_Use => False); - - if Is_Child_Unit (S) then - - -- Remove child unit from stack, as well as inner scopes. - -- Removing the context of a child unit removes parent - -- units as well. - - while Current_Scope /= S loop - Num_Inner := Num_Inner + 1; - Inner_Scopes (Num_Inner) := Current_Scope; - Pop_Scope; - end loop; - - Pop_Scope; - Remove_Context (Curr_Comp); - Curr_Scope := S; - - else - Remove_Context (Curr_Comp); - end if; - - if Ekind (Curr_Unit) = E_Package_Body then - Remove_Context (Library_Unit (Curr_Comp)); - end if; - end if; - - S := Scope (S); - end loop; - pragma Assert (Num_Inner < Num_Scopes); - - New_Scope (Standard_Standard); - Scope_Stack.Table (Scope_Stack.Last).Is_Active_Stack_Base := True; - Instantiate_Package_Body - ((N, Act_Decl, Expander_Active, Current_Sem_Unit), True); - Pop_Scope; - - -- Restore context - - Set_Is_Immediately_Visible (Gen_Comp, Vis); - - -- Reset Generic_Instance flag so that use clauses can be installed - -- in the proper order. (See Use_One_Package for effect of enclosing - -- instances on processing of use clauses). - - for J in 1 .. N_Instances loop - Set_Is_Generic_Instance (Instances (J), False); - end loop; - - if Removed then - Install_Context (Curr_Comp); - - if Present (Curr_Scope) - and then Is_Child_Unit (Curr_Scope) - then - New_Scope (Curr_Scope); - Set_Is_Immediately_Visible (Curr_Scope); - - -- Finally, restore inner scopes as well - - for J in reverse 1 .. Num_Inner loop - New_Scope (Inner_Scopes (J)); - end loop; - end if; - - Restore_Scope_Stack (Handle_Use => False); - - if Present (Curr_Scope) - and then - (In_Private_Part (Curr_Scope) - or else In_Package_Body (Curr_Scope)) - then - -- Install private declaration of ancestor units, which - -- are currently available. Restore_Scope_Stack and - -- Install_Context only install the visible part of parents. - - declare - Par : Entity_Id; - begin - Par := Scope (Curr_Scope); - while (Present (Par)) - and then Par /= Standard_Standard - loop - Install_Private_Declarations (Par); - Par := Scope (Par); - end loop; - end; - end if; - end if; - - -- Restore use clauses. For a child unit, use clauses in the parents - -- are restored when installing the context, so only those in inner - -- scopes (and those local to the child unit itself) need to be - -- installed explicitly. - - if Is_Child_Unit (Curr_Unit) - and then Removed - then - for J in reverse 1 .. Num_Inner + 1 loop - Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause := - Use_Clauses (J); - Install_Use_Clauses (Use_Clauses (J)); - end loop; - - else - for J in reverse 1 .. Num_Scopes loop - Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause := - Use_Clauses (J); - Install_Use_Clauses (Use_Clauses (J)); - end loop; - end if; - - for J in 1 .. N_Instances loop - Set_Is_Generic_Instance (Instances (J), True); - end loop; - - -- If generic unit is in current unit, current context is correct - - else - Instantiate_Package_Body - ((N, Act_Decl, Expander_Active, Current_Sem_Unit), True); - end if; - end Inline_Instance_Body; - - ------------------------------------- - -- Analyze_Procedure_Instantiation -- - ------------------------------------- - - procedure Analyze_Procedure_Instantiation (N : Node_Id) is - begin - Analyze_Subprogram_Instantiation (N, E_Procedure); - end Analyze_Procedure_Instantiation; - - -------------------------------------- - -- Analyze_Subprogram_Instantiation -- - -------------------------------------- - - procedure Analyze_Subprogram_Instantiation - (N : Node_Id; - K : Entity_Kind) - is - Loc : constant Source_Ptr := Sloc (N); - Gen_Id : constant Node_Id := Name (N); - - Anon_Id : constant Entity_Id := - Make_Defining_Identifier (Sloc (Defining_Entity (N)), - Chars => New_External_Name - (Chars (Defining_Entity (N)), 'R')); - - Act_Decl_Id : Entity_Id; - Act_Decl : Node_Id; - Act_Spec : Node_Id; - Act_Tree : Node_Id; - - Env_Installed : Boolean := False; - Gen_Unit : Entity_Id; - Gen_Decl : Node_Id; - Pack_Id : Entity_Id; - Parent_Installed : Boolean := False; - Renaming_List : List_Id; - - procedure Analyze_Instance_And_Renamings; - -- The instance must be analyzed in a context that includes the - -- mappings of generic parameters into actuals. We create a package - -- declaration for this purpose, and a subprogram with an internal - -- name within the package. The subprogram instance is simply an - -- alias for the internal subprogram, declared in the current scope. - - ------------------------------------ - -- Analyze_Instance_And_Renamings -- - ------------------------------------ - - procedure Analyze_Instance_And_Renamings is - Def_Ent : constant Entity_Id := Defining_Entity (N); - Pack_Decl : Node_Id; - - begin - if Nkind (Parent (N)) = N_Compilation_Unit then - - -- For the case of a compilation unit, the container package - -- has the same name as the instantiation, to insure that the - -- binder calls the elaboration procedure with the right name. - -- Copy the entity of the instance, which may have compilation - -- level flags (e.g. Is_Child_Unit) set. - - Pack_Id := New_Copy (Def_Ent); - - else - -- Otherwise we use the name of the instantiation concatenated - -- with its source position to ensure uniqueness if there are - -- several instantiations with the same name. - - Pack_Id := - Make_Defining_Identifier (Loc, - Chars => New_External_Name - (Related_Id => Chars (Def_Ent), - Suffix => "GP", - Suffix_Index => Source_Offset (Sloc (Def_Ent)))); - end if; - - Pack_Decl := Make_Package_Declaration (Loc, - Specification => Make_Package_Specification (Loc, - Defining_Unit_Name => Pack_Id, - Visible_Declarations => Renaming_List, - End_Label => Empty)); - - Set_Instance_Spec (N, Pack_Decl); - Set_Is_Generic_Instance (Pack_Id); - Set_Needs_Debug_Info (Pack_Id); - - -- Case of not a compilation unit - - if Nkind (Parent (N)) /= N_Compilation_Unit then - Mark_Rewrite_Insertion (Pack_Decl); - Insert_Before (N, Pack_Decl); - Set_Has_Completion (Pack_Id); - - -- Case of an instantiation that is a compilation unit - - -- Place declaration on current node so context is complete - -- for analysis (including nested instantiations), and for - -- use in a context_clause (see Analyze_With_Clause). - - else - Set_Unit (Parent (N), Pack_Decl); - Set_Parent_Spec (Pack_Decl, Parent_Spec (N)); - end if; - - Analyze (Pack_Decl); - Check_Formal_Packages (Pack_Id); - Set_Is_Generic_Instance (Pack_Id, False); - - -- Body of the enclosing package is supplied when instantiating - -- the subprogram body, after semantic analysis is completed. - - if Nkind (Parent (N)) = N_Compilation_Unit then - - -- Remove package itself from visibility, so it does not - -- conflict with subprogram. - - Set_Name_Entity_Id (Chars (Pack_Id), Homonym (Pack_Id)); - - -- Set name and scope of internal subprogram so that the - -- proper external name will be generated. The proper scope - -- is the scope of the wrapper package. We need to generate - -- debugging information for the internal subprogram, so set - -- flag accordingly. - - Set_Chars (Anon_Id, Chars (Defining_Entity (N))); - Set_Scope (Anon_Id, Scope (Pack_Id)); - - -- Mark wrapper package as referenced, to avoid spurious - -- warnings if the instantiation appears in various with_ - -- clauses of subunits of the main unit. - - Set_Referenced (Pack_Id); - end if; - - Set_Is_Generic_Instance (Anon_Id); - Set_Needs_Debug_Info (Anon_Id); - Act_Decl_Id := New_Copy (Anon_Id); - - Set_Parent (Act_Decl_Id, Parent (Anon_Id)); - Set_Chars (Act_Decl_Id, Chars (Defining_Entity (N))); - Set_Sloc (Act_Decl_Id, Sloc (Defining_Entity (N))); - Set_Comes_From_Source (Act_Decl_Id, True); - - -- The signature may involve types that are not frozen yet, but - -- the subprogram will be frozen at the point the wrapper package - -- is frozen, so it does not need its own freeze node. In fact, if - -- one is created, it might conflict with the freezing actions from - -- the wrapper package (see 7206-013). - - Set_Has_Delayed_Freeze (Anon_Id, False); - - -- If the instance is a child unit, mark the Id accordingly. Mark - -- the anonymous entity as well, which is the real subprogram and - -- which is used when the instance appears in a context clause. - - Set_Is_Child_Unit (Act_Decl_Id, Is_Child_Unit (Defining_Entity (N))); - Set_Is_Child_Unit (Anon_Id, Is_Child_Unit (Defining_Entity (N))); - New_Overloaded_Entity (Act_Decl_Id); - Check_Eliminated (Act_Decl_Id); - - -- In compilation unit case, kill elaboration checks on the - -- instantiation, since they are never needed -- the body is - -- instantiated at the same point as the spec. - - if Nkind (Parent (N)) = N_Compilation_Unit then - Set_Suppress_Elaboration_Warnings (Act_Decl_Id); - Set_Kill_Elaboration_Checks (Act_Decl_Id); - Set_Is_Compilation_Unit (Anon_Id); - - Set_Cunit_Entity (Current_Sem_Unit, Pack_Id); - end if; - - -- The instance is not a freezing point for the new subprogram - - Set_Is_Frozen (Act_Decl_Id, False); - - if Nkind (Defining_Entity (N)) = N_Defining_Operator_Symbol then - Valid_Operator_Definition (Act_Decl_Id); - end if; - - Set_Alias (Act_Decl_Id, Anon_Id); - Set_Parent (Act_Decl_Id, Parent (Anon_Id)); - Set_Has_Completion (Act_Decl_Id); - Set_Related_Instance (Pack_Id, Act_Decl_Id); - - if Nkind (Parent (N)) = N_Compilation_Unit then - Set_Body_Required (Parent (N), False); - end if; - - end Analyze_Instance_And_Renamings; - - -- Start of processing for Analyze_Subprogram_Instantiation - - begin - -- Very first thing: apply the special kludge for Text_IO processing - -- in case we are instantiating one of the children of [Wide_]Text_IO. - -- Of course such an instantiation is bogus (these are packages, not - -- subprograms), but we get a better error message if we do this. - - Text_IO_Kludge (Gen_Id); - - -- Make node global for error reporting - - Instantiation_Node := N; - Pre_Analyze_Actuals (N); - - Init_Env; - Env_Installed := True; - Check_Generic_Child_Unit (Gen_Id, Parent_Installed); - Gen_Unit := Entity (Gen_Id); - - Generate_Reference (Gen_Unit, Gen_Id); - - if Nkind (Gen_Id) = N_Identifier - and then Chars (Gen_Unit) = Chars (Defining_Entity (N)) - then - Error_Msg_NE - ("& is hidden within declaration of instance", Gen_Id, Gen_Unit); - end if; - - if Etype (Gen_Unit) = Any_Type then - Restore_Env; - return; - end if; - - -- Verify that it is a generic subprogram of the right kind, and that - -- it does not lead to a circular instantiation. - - if Ekind (Gen_Unit) /= E_Generic_Procedure - and then Ekind (Gen_Unit) /= E_Generic_Function - then - Error_Msg_N ("expect generic subprogram in instantiation", Gen_Id); - - elsif In_Open_Scopes (Gen_Unit) then - Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit); - - elsif K = E_Procedure - and then Ekind (Gen_Unit) /= E_Generic_Procedure - then - if Ekind (Gen_Unit) = E_Generic_Function then - Error_Msg_N - ("cannot instantiate generic function as procedure", Gen_Id); - else - Error_Msg_N - ("expect name of generic procedure in instantiation", Gen_Id); - end if; - - elsif K = E_Function - and then Ekind (Gen_Unit) /= E_Generic_Function - then - if Ekind (Gen_Unit) = E_Generic_Procedure then - Error_Msg_N - ("cannot instantiate generic procedure as function", Gen_Id); - else - Error_Msg_N - ("expect name of generic function in instantiation", Gen_Id); - end if; - - else - Set_Entity (Gen_Id, Gen_Unit); - Set_Is_Instantiated (Gen_Unit); - - if In_Extended_Main_Source_Unit (N) then - Generate_Reference (Gen_Unit, N); - end if; - - -- If renaming, get original unit - - if Present (Renamed_Object (Gen_Unit)) - and then (Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Procedure - or else - Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Function) - then - Gen_Unit := Renamed_Object (Gen_Unit); - Set_Is_Instantiated (Gen_Unit); - Generate_Reference (Gen_Unit, N); - end if; - - if Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then - Error_Msg_Node_2 := Current_Scope; - Error_Msg_NE - ("circular Instantiation: & instantiated in &!", N, Gen_Unit); - Circularity_Detected := True; - return; - end if; - - Gen_Decl := Unit_Declaration_Node (Gen_Unit); - - -- The subprogram itself cannot contain a nested instance, so - -- the current parent is left empty. - - Set_Instance_Env (Gen_Unit, Empty); - - -- Initialize renamings map, for error checking - - Generic_Renamings.Set_Last (0); - Generic_Renamings_HTable.Reset; - - Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment); - - -- Copy original generic tree, to produce text for instantiation - - Act_Tree := - Copy_Generic_Node - (Original_Node (Gen_Decl), Empty, Instantiating => True); - - Act_Spec := Specification (Act_Tree); - Renaming_List := - Analyze_Associations - (N, - Generic_Formal_Declarations (Act_Tree), - Generic_Formal_Declarations (Gen_Decl)); - - -- Build the subprogram declaration, which does not appear - -- in the generic template, and give it a sloc consistent - -- with that of the template. - - Set_Defining_Unit_Name (Act_Spec, Anon_Id); - Set_Generic_Parent (Act_Spec, Gen_Unit); - Act_Decl := - Make_Subprogram_Declaration (Sloc (Act_Spec), - Specification => Act_Spec); - - Set_Categorization_From_Pragmas (Act_Decl); - - if Parent_Installed then - Hide_Current_Scope; - end if; - - Append (Act_Decl, Renaming_List); - Analyze_Instance_And_Renamings; - - -- If the generic is marked Import (Intrinsic), then so is the - -- instance. This indicates that there is no body to instantiate. - -- If generic is marked inline, so it the instance, and the - -- anonymous subprogram it renames. If inlined, or else if inlining - -- is enabled for the compilation, we generate the instance body - -- even if it is not within the main unit. - - -- Any other pragmas might also be inherited ??? - - if Is_Intrinsic_Subprogram (Gen_Unit) then - Set_Is_Intrinsic_Subprogram (Anon_Id); - Set_Is_Intrinsic_Subprogram (Act_Decl_Id); - - if Chars (Gen_Unit) = Name_Unchecked_Conversion then - Validate_Unchecked_Conversion (N, Act_Decl_Id); - end if; - end if; - - Generate_Definition (Act_Decl_Id); - - Set_Is_Inlined (Act_Decl_Id, Is_Inlined (Gen_Unit)); - Set_Is_Inlined (Anon_Id, Is_Inlined (Gen_Unit)); - - if not Is_Intrinsic_Subprogram (Gen_Unit) then - Check_Elab_Instantiation (N); - end if; - - if Is_Dispatching_Operation (Act_Decl_Id) - and then Ada_Version >= Ada_05 - then - declare - Formal : Entity_Id; - - begin - Formal := First_Formal (Act_Decl_Id); - while Present (Formal) loop - if Ekind (Etype (Formal)) = E_Anonymous_Access_Type - and then Is_Controlling_Formal (Formal) - and then not Can_Never_Be_Null (Formal) - then - Error_Msg_NE ("access parameter& is controlling,", - N, Formal); - Error_Msg_NE ("\corresponding parameter of & must be" - & " explicitly null-excluding", N, Gen_Id); - end if; - - Next_Formal (Formal); - end loop; - end; - end if; - - Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id); - - -- Subject to change, pending on if other pragmas are inherited ??? - - Validate_Categorization_Dependency (N, Act_Decl_Id); - - if not Is_Intrinsic_Subprogram (Act_Decl_Id) then - if not Generic_Separately_Compiled (Gen_Unit) then - Inherit_Context (Gen_Decl, N); - end if; - - Restore_Private_Views (Pack_Id, False); - - -- If the context requires a full instantiation, mark node for - -- subsequent construction of the body. - - if (Is_In_Main_Unit (N) - or else Is_Inlined (Act_Decl_Id)) - and then (Operating_Mode = Generate_Code - or else (Operating_Mode = Check_Semantics - and then ASIS_Mode)) - and then (Expander_Active or else ASIS_Mode) - and then not ABE_Is_Certain (N) - and then not Is_Eliminated (Act_Decl_Id) - then - Pending_Instantiations.Increment_Last; - Pending_Instantiations.Table (Pending_Instantiations.Last) := - (N, Act_Decl, Expander_Active, Current_Sem_Unit); - Check_Forward_Instantiation (Gen_Decl); - - -- The wrapper package is always delayed, because it does - -- not constitute a freeze point, but to insure that the - -- freeze node is placed properly, it is created directly - -- when instantiating the body (otherwise the freeze node - -- might appear to early for nested instantiations). - - elsif Nkind (Parent (N)) = N_Compilation_Unit then - - -- For ASIS purposes, indicate that the wrapper package has - -- replaced the instantiation node. - - Rewrite (N, Unit (Parent (N))); - Set_Unit (Parent (N), N); - end if; - - elsif Nkind (Parent (N)) = N_Compilation_Unit then - - -- Replace instance node for library-level instantiations - -- of intrinsic subprograms, for ASIS use. - - Rewrite (N, Unit (Parent (N))); - Set_Unit (Parent (N), N); - end if; - - if Parent_Installed then - Remove_Parent; - end if; - - Restore_Env; - Env_Installed := False; - Generic_Renamings.Set_Last (0); - Generic_Renamings_HTable.Reset; - end if; - - exception - when Instantiation_Error => - if Parent_Installed then - Remove_Parent; - end if; - - if Env_Installed then - Restore_Env; - end if; - end Analyze_Subprogram_Instantiation; - - ------------------------- - -- Get_Associated_Node -- - ------------------------- - - function Get_Associated_Node (N : Node_Id) return Node_Id is - Assoc : Node_Id := Associated_Node (N); - - begin - if Nkind (Assoc) /= Nkind (N) then - return Assoc; - - elsif Nkind (Assoc) = N_Aggregate - or else Nkind (Assoc) = N_Extension_Aggregate - then - return Assoc; - - else - -- If the node is part of an inner generic, it may itself have been - -- remapped into a further generic copy. Associated_Node is otherwise - -- used for the entity of the node, and will be of a different node - -- kind, or else N has been rewritten as a literal or function call. - - while Present (Associated_Node (Assoc)) - and then Nkind (Associated_Node (Assoc)) = Nkind (Assoc) - loop - Assoc := Associated_Node (Assoc); - end loop; - - -- Follow and additional link in case the final node was rewritten. - -- This can only happen with nested generic units. - - if (Nkind (Assoc) = N_Identifier or else Nkind (Assoc) in N_Op) - and then Present (Associated_Node (Assoc)) - and then (Nkind (Associated_Node (Assoc)) = N_Function_Call - or else - Nkind (Associated_Node (Assoc)) = N_Explicit_Dereference - or else - Nkind (Associated_Node (Assoc)) = N_Integer_Literal - or else - Nkind (Associated_Node (Assoc)) = N_Real_Literal - or else - Nkind (Associated_Node (Assoc)) = N_String_Literal) - then - Assoc := Associated_Node (Assoc); - end if; - - return Assoc; - end if; - end Get_Associated_Node; - - ------------------------------------------- - -- Build_Instance_Compilation_Unit_Nodes -- - ------------------------------------------- - - procedure Build_Instance_Compilation_Unit_Nodes - (N : Node_Id; - Act_Body : Node_Id; - Act_Decl : Node_Id) - is - Decl_Cunit : Node_Id; - Body_Cunit : Node_Id; - Citem : Node_Id; - New_Main : constant Entity_Id := Defining_Entity (Act_Decl); - Old_Main : constant Entity_Id := Cunit_Entity (Main_Unit); - - begin - -- A new compilation unit node is built for the instance declaration - - Decl_Cunit := - Make_Compilation_Unit (Sloc (N), - Context_Items => Empty_List, - Unit => Act_Decl, - Aux_Decls_Node => - Make_Compilation_Unit_Aux (Sloc (N))); - - Set_Parent_Spec (Act_Decl, Parent_Spec (N)); - Set_Body_Required (Decl_Cunit, True); - - -- We use the original instantiation compilation unit as the resulting - -- compilation unit of the instance, since this is the main unit. - - Rewrite (N, Act_Body); - Body_Cunit := Parent (N); - - -- The two compilation unit nodes are linked by the Library_Unit field - - Set_Library_Unit (Decl_Cunit, Body_Cunit); - Set_Library_Unit (Body_Cunit, Decl_Cunit); - - -- Preserve the private nature of the package if needed - - Set_Private_Present (Decl_Cunit, Private_Present (Body_Cunit)); - - -- If the instance is not the main unit, its context, categorization, - -- and elaboration entity are not relevant to the compilation. - - if Parent (N) /= Cunit (Main_Unit) then - return; - end if; - - -- The context clause items on the instantiation, which are now - -- attached to the body compilation unit (since the body overwrote - -- the original instantiation node), semantically belong on the spec, - -- so copy them there. It's harmless to leave them on the body as well. - -- In fact one could argue that they belong in both places. - - Citem := First (Context_Items (Body_Cunit)); - while Present (Citem) loop - Append (New_Copy (Citem), Context_Items (Decl_Cunit)); - Next (Citem); - end loop; - - -- Propagate categorization flags on packages, so that they appear - -- in ali file for the spec of the unit. - - if Ekind (New_Main) = E_Package then - Set_Is_Pure (Old_Main, Is_Pure (New_Main)); - Set_Is_Preelaborated (Old_Main, Is_Preelaborated (New_Main)); - Set_Is_Remote_Types (Old_Main, Is_Remote_Types (New_Main)); - Set_Is_Shared_Passive (Old_Main, Is_Shared_Passive (New_Main)); - Set_Is_Remote_Call_Interface - (Old_Main, Is_Remote_Call_Interface (New_Main)); - end if; - - -- Make entry in Units table, so that binder can generate call to - -- elaboration procedure for body, if any. - - Make_Instance_Unit (Body_Cunit); - Main_Unit_Entity := New_Main; - Set_Cunit_Entity (Main_Unit, Main_Unit_Entity); - - -- Build elaboration entity, since the instance may certainly - -- generate elaboration code requiring a flag for protection. - - Build_Elaboration_Entity (Decl_Cunit, New_Main); - end Build_Instance_Compilation_Unit_Nodes; - - ----------------------------------- - -- Check_Formal_Package_Instance -- - ----------------------------------- - - -- If the formal has specific parameters, they must match those of the - -- actual. Both of them are instances, and the renaming declarations - -- for their formal parameters appear in the same order in both. The - -- analyzed formal has been analyzed in the context of the current - -- instance. - - procedure Check_Formal_Package_Instance - (Formal_Pack : Entity_Id; - Actual_Pack : Entity_Id) - is - E1 : Entity_Id := First_Entity (Actual_Pack); - E2 : Entity_Id := First_Entity (Formal_Pack); - - Expr1 : Node_Id; - Expr2 : Node_Id; - - procedure Check_Mismatch (B : Boolean); - -- Common error routine for mismatch between the parameters of - -- the actual instance and those of the formal package. - - function Same_Instantiated_Constant (E1, E2 : Entity_Id) return Boolean; - -- The formal may come from a nested formal package, and the actual - -- may have been constant-folded. To determine whether the two denote - -- the same entity we may have to traverse several definitions to - -- recover the ultimate entity that they refer to. - - function Same_Instantiated_Variable (E1, E2 : Entity_Id) return Boolean; - -- Similarly, if the formal comes from a nested formal package, the - -- actual may designate the formal through multiple renamings, which - -- have to be followed to determine the original variable in question. - - -------------------- - -- Check_Mismatch -- - -------------------- - - procedure Check_Mismatch (B : Boolean) is - begin - if B then - Error_Msg_NE - ("actual for & in actual instance does not match formal", - Parent (Actual_Pack), E1); - end if; - end Check_Mismatch; - - -------------------------------- - -- Same_Instantiated_Constant -- - -------------------------------- - - function Same_Instantiated_Constant - (E1, E2 : Entity_Id) return Boolean - is - Ent : Entity_Id; - - begin - Ent := E2; - while Present (Ent) loop - if E1 = Ent then - return True; - - elsif Ekind (Ent) /= E_Constant then - return False; - - elsif Is_Entity_Name (Constant_Value (Ent)) then - if Entity (Constant_Value (Ent)) = E1 then - return True; - else - Ent := Entity (Constant_Value (Ent)); - end if; - - -- The actual may be a constant that has been folded. Recover - -- original name. - - elsif Is_Entity_Name (Original_Node (Constant_Value (Ent))) then - Ent := Entity (Original_Node (Constant_Value (Ent))); - else - return False; - end if; - end loop; - - return False; - end Same_Instantiated_Constant; - - -------------------------------- - -- Same_Instantiated_Variable -- - -------------------------------- - - function Same_Instantiated_Variable - (E1, E2 : Entity_Id) return Boolean - is - function Original_Entity (E : Entity_Id) return Entity_Id; - -- Follow chain of renamings to the ultimate ancestor - - --------------------- - -- Original_Entity -- - --------------------- - - function Original_Entity (E : Entity_Id) return Entity_Id is - Orig : Entity_Id; - - begin - Orig := E; - while Nkind (Parent (Orig)) = N_Object_Renaming_Declaration - and then Present (Renamed_Object (Orig)) - and then Is_Entity_Name (Renamed_Object (Orig)) - loop - Orig := Entity (Renamed_Object (Orig)); - end loop; - - return Orig; - end Original_Entity; - - -- Start of processing for Same_Instantiated_Variable - - begin - return Ekind (E1) = Ekind (E2) - and then Original_Entity (E1) = Original_Entity (E2); - end Same_Instantiated_Variable; - - -- Start of processing for Check_Formal_Package_Instance - - begin - while Present (E1) - and then Present (E2) - loop - exit when Ekind (E1) = E_Package - and then Renamed_Entity (E1) = Renamed_Entity (Actual_Pack); - - if Is_Type (E1) then - - -- Subtypes must statically match. E1 and E2 are the - -- local entities that are subtypes of the actuals. - -- Itypes generated for other parameters need not be checked, - -- the check will be performed on the parameters themselves. - - if not Is_Itype (E1) - and then not Is_Itype (E2) - then - Check_Mismatch - (not Is_Type (E2) - or else Etype (E1) /= Etype (E2) - or else not Subtypes_Statically_Match (E1, E2)); - end if; - - elsif Ekind (E1) = E_Constant then - - -- IN parameters must denote the same static value, or - -- the same constant, or the literal null. - - Expr1 := Expression (Parent (E1)); - - if Ekind (E2) /= E_Constant then - Check_Mismatch (True); - goto Next_E; - else - Expr2 := Expression (Parent (E2)); - end if; - - if Is_Static_Expression (Expr1) then - - if not Is_Static_Expression (Expr2) then - Check_Mismatch (True); - - elsif Is_Integer_Type (Etype (E1)) then - - declare - V1 : constant Uint := Expr_Value (Expr1); - V2 : constant Uint := Expr_Value (Expr2); - begin - Check_Mismatch (V1 /= V2); - end; - - elsif Is_Real_Type (Etype (E1)) then - declare - V1 : constant Ureal := Expr_Value_R (Expr1); - V2 : constant Ureal := Expr_Value_R (Expr2); - begin - Check_Mismatch (V1 /= V2); - end; - - elsif Is_String_Type (Etype (E1)) - and then Nkind (Expr1) = N_String_Literal - then - - if Nkind (Expr2) /= N_String_Literal then - Check_Mismatch (True); - else - Check_Mismatch - (not String_Equal (Strval (Expr1), Strval (Expr2))); - end if; - end if; - - elsif Is_Entity_Name (Expr1) then - if Is_Entity_Name (Expr2) then - if Entity (Expr1) = Entity (Expr2) then - null; - else - Check_Mismatch - (not Same_Instantiated_Constant - (Entity (Expr1), Entity (Expr2))); - end if; - else - Check_Mismatch (True); - end if; - - elsif Is_Entity_Name (Original_Node (Expr1)) - and then Is_Entity_Name (Expr2) - and then - Same_Instantiated_Constant - (Entity (Original_Node (Expr1)), Entity (Expr2)) - then - null; - - elsif Nkind (Expr1) = N_Null then - Check_Mismatch (Nkind (Expr1) /= N_Null); - - else - Check_Mismatch (True); - end if; - - elsif Ekind (E1) = E_Variable then - Check_Mismatch (not Same_Instantiated_Variable (E1, E2)); - - elsif Ekind (E1) = E_Package then - Check_Mismatch - (Ekind (E1) /= Ekind (E2) - or else Renamed_Object (E1) /= Renamed_Object (E2)); - - elsif Is_Overloadable (E1) then - - -- Verify that the names of the entities match. - -- What if actual is an attribute ??? - - Check_Mismatch - (Ekind (E2) /= Ekind (E1) or else (Alias (E1)) /= Alias (E2)); - - else - raise Program_Error; - end if; - - <<Next_E>> - Next_Entity (E1); - Next_Entity (E2); - end loop; - end Check_Formal_Package_Instance; - - --------------------------- - -- Check_Formal_Packages -- - --------------------------- - - procedure Check_Formal_Packages (P_Id : Entity_Id) is - E : Entity_Id; - Formal_P : Entity_Id; - - begin - -- Iterate through the declarations in the instance, looking for - -- package renaming declarations that denote instances of formal - -- packages. Stop when we find the renaming of the current package - -- itself. The declaration for a formal package without a box is - -- followed by an internal entity that repeats the instantiation. - - E := First_Entity (P_Id); - while Present (E) loop - if Ekind (E) = E_Package then - if Renamed_Object (E) = P_Id then - exit; - - elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then - null; - - elsif not Box_Present (Parent (Associated_Formal_Package (E))) then - Formal_P := Next_Entity (E); - Check_Formal_Package_Instance (Formal_P, E); - end if; - end if; - - Next_Entity (E); - end loop; - end Check_Formal_Packages; - - --------------------------------- - -- Check_Forward_Instantiation -- - --------------------------------- - - procedure Check_Forward_Instantiation (Decl : Node_Id) is - S : Entity_Id; - Gen_Comp : Entity_Id := Cunit_Entity (Get_Source_Unit (Decl)); - - begin - -- The instantiation appears before the generic body if we are in the - -- scope of the unit containing the generic, either in its spec or in - -- the package body. and before the generic body. - - if Ekind (Gen_Comp) = E_Package_Body then - Gen_Comp := Spec_Entity (Gen_Comp); - end if; - - if In_Open_Scopes (Gen_Comp) - and then No (Corresponding_Body (Decl)) - then - S := Current_Scope; - - while Present (S) - and then not Is_Compilation_Unit (S) - and then not Is_Child_Unit (S) - loop - if Ekind (S) = E_Package then - Set_Has_Forward_Instantiation (S); - end if; - - S := Scope (S); - end loop; - end if; - end Check_Forward_Instantiation; - - --------------------------- - -- Check_Generic_Actuals -- - --------------------------- - - -- The visibility of the actuals may be different between the - -- point of generic instantiation and the instantiation of the body. - - procedure Check_Generic_Actuals - (Instance : Entity_Id; - Is_Formal_Box : Boolean) - is - E : Entity_Id; - Astype : Entity_Id; - - function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean; - -- For a formal that is an array type, the component type is often - -- a previous formal in the same unit. The privacy status of the - -- component type will have been examined earlier in the traversal - -- of the corresponding actuals, and this status should not be - -- modified for the array type itself. - -- To detect this case we have to rescan the list of formals, which - -- is usually short enough to ignore the resulting inefficiency. - - function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean is - Prev : Entity_Id; - begin - Prev := First_Entity (Instance); - while Present (Prev) loop - if Is_Type (Prev) - and then Nkind (Parent (Prev)) = N_Subtype_Declaration - and then Is_Entity_Name (Subtype_Indication (Parent (Prev))) - and then Entity (Subtype_Indication (Parent (Prev))) = Typ - then - return True; - elsif Prev = E then - return False; - else - Next_Entity (Prev); - end if; - end loop; - return False; - end Denotes_Previous_Actual; - - -- Start of processing for Check_Generic_Actuals - - begin - E := First_Entity (Instance); - while Present (E) loop - if Is_Type (E) - and then Nkind (Parent (E)) = N_Subtype_Declaration - and then Scope (Etype (E)) /= Instance - and then Is_Entity_Name (Subtype_Indication (Parent (E))) - then - if Is_Array_Type (E) - and then Denotes_Previous_Actual (Component_Type (E)) - then - null; - else - Check_Private_View (Subtype_Indication (Parent (E))); - end if; - Set_Is_Generic_Actual_Type (E, True); - Set_Is_Hidden (E, False); - Set_Is_Potentially_Use_Visible (E, - In_Use (Instance)); - - -- We constructed the generic actual type as a subtype of - -- the supplied type. This means that it normally would not - -- inherit subtype specific attributes of the actual, which - -- is wrong for the generic case. - - Astype := Ancestor_Subtype (E); - - if No (Astype) then - - -- can happen when E is an itype that is the full view of - -- a private type completed, e.g. with a constrained array. - - Astype := Base_Type (E); - end if; - - Set_Size_Info (E, (Astype)); - Set_RM_Size (E, RM_Size (Astype)); - Set_First_Rep_Item (E, First_Rep_Item (Astype)); - - if Is_Discrete_Or_Fixed_Point_Type (E) then - Set_RM_Size (E, RM_Size (Astype)); - - -- In nested instances, the base type of an access actual - -- may itself be private, and need to be exchanged. - - elsif Is_Access_Type (E) - and then Is_Private_Type (Etype (E)) - then - Check_Private_View - (New_Occurrence_Of (Etype (E), Sloc (Instance))); - end if; - - elsif Ekind (E) = E_Package then - - -- If this is the renaming for the current instance, we're done. - -- Otherwise it is a formal package. If the corresponding formal - -- was declared with a box, the (instantiations of the) generic - -- formal part are also visible. Otherwise, ignore the entity - -- created to validate the actuals. - - if Renamed_Object (E) = Instance then - exit; - - elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then - null; - - -- The visibility of a formal of an enclosing generic is already - -- correct. - - elsif Denotes_Formal_Package (E) then - null; - - elsif Present (Associated_Formal_Package (E)) then - if Box_Present (Parent (Associated_Formal_Package (E))) then - Check_Generic_Actuals (Renamed_Object (E), True); - end if; - - Set_Is_Hidden (E, False); - end if; - - -- If this is a subprogram instance (in a wrapper package) the - -- actual is fully visible. - - elsif Is_Wrapper_Package (Instance) then - Set_Is_Hidden (E, False); - - else - Set_Is_Hidden (E, not Is_Formal_Box); - end if; - - Next_Entity (E); - end loop; - end Check_Generic_Actuals; - - ------------------------------ - -- Check_Generic_Child_Unit -- - ------------------------------ - - procedure Check_Generic_Child_Unit - (Gen_Id : Node_Id; - Parent_Installed : in out Boolean) - is - Loc : constant Source_Ptr := Sloc (Gen_Id); - Gen_Par : Entity_Id := Empty; - Inst_Par : Entity_Id; - E : Entity_Id; - S : Node_Id; - - function Find_Generic_Child - (Scop : Entity_Id; - Id : Node_Id) return Entity_Id; - -- Search generic parent for possible child unit with the given name - - function In_Enclosing_Instance return Boolean; - -- Within an instance of the parent, the child unit may be denoted - -- by a simple name, or an abbreviated expanded name. Examine enclosing - -- scopes to locate a possible parent instantiation. - - ------------------------ - -- Find_Generic_Child -- - ------------------------ - - function Find_Generic_Child - (Scop : Entity_Id; - Id : Node_Id) return Entity_Id - is - E : Entity_Id; - - begin - -- If entity of name is already set, instance has already been - -- resolved, e.g. in an enclosing instantiation. - - if Present (Entity (Id)) then - if Scope (Entity (Id)) = Scop then - return Entity (Id); - else - return Empty; - end if; - - else - E := First_Entity (Scop); - while Present (E) loop - if Chars (E) = Chars (Id) - and then Is_Child_Unit (E) - then - if Is_Child_Unit (E) - and then not Is_Visible_Child_Unit (E) - then - Error_Msg_NE - ("generic child unit& is not visible", Gen_Id, E); - end if; - - Set_Entity (Id, E); - return E; - end if; - - Next_Entity (E); - end loop; - - return Empty; - end if; - end Find_Generic_Child; - - --------------------------- - -- In_Enclosing_Instance -- - --------------------------- - - function In_Enclosing_Instance return Boolean is - Enclosing_Instance : Node_Id; - Instance_Decl : Node_Id; - - begin - -- We do not inline any call that contains instantiations, except - -- for instantiations of Unchecked_Conversion, so if we are within - -- an inlined body the current instance does not require parents. - - if In_Inlined_Body then - pragma Assert (Chars (Gen_Id) = Name_Unchecked_Conversion); - return False; - end if; - - -- Loop to check enclosing scopes - - Enclosing_Instance := Current_Scope; - while Present (Enclosing_Instance) loop - Instance_Decl := Unit_Declaration_Node (Enclosing_Instance); - - if Ekind (Enclosing_Instance) = E_Package - and then Is_Generic_Instance (Enclosing_Instance) - and then Present - (Generic_Parent (Specification (Instance_Decl))) - then - -- Check whether the generic we are looking for is a child - -- of this instance. - - E := Find_Generic_Child - (Generic_Parent (Specification (Instance_Decl)), Gen_Id); - exit when Present (E); - - else - E := Empty; - end if; - - Enclosing_Instance := Scope (Enclosing_Instance); - end loop; - - if No (E) then - - -- Not a child unit - - Analyze (Gen_Id); - return False; - - else - Rewrite (Gen_Id, - Make_Expanded_Name (Loc, - Chars => Chars (E), - Prefix => New_Occurrence_Of (Enclosing_Instance, Loc), - Selector_Name => New_Occurrence_Of (E, Loc))); - - Set_Entity (Gen_Id, E); - Set_Etype (Gen_Id, Etype (E)); - Parent_Installed := False; -- Already in scope. - return True; - end if; - end In_Enclosing_Instance; - - -- Start of processing for Check_Generic_Child_Unit - - begin - -- If the name of the generic is given by a selected component, it - -- may be the name of a generic child unit, and the prefix is the name - -- of an instance of the parent, in which case the child unit must be - -- visible. If this instance is not in scope, it must be placed there - -- and removed after instantiation, because what is being instantiated - -- is not the original child, but the corresponding child present in - -- the instance of the parent. - - -- If the child is instantiated within the parent, it can be given by - -- a simple name. In this case the instance is already in scope, but - -- the child generic must be recovered from the generic parent as well. - - if Nkind (Gen_Id) = N_Selected_Component then - S := Selector_Name (Gen_Id); - Analyze (Prefix (Gen_Id)); - Inst_Par := Entity (Prefix (Gen_Id)); - - if Ekind (Inst_Par) = E_Package - and then Present (Renamed_Object (Inst_Par)) - then - Inst_Par := Renamed_Object (Inst_Par); - end if; - - if Ekind (Inst_Par) = E_Package then - if Nkind (Parent (Inst_Par)) = N_Package_Specification then - Gen_Par := Generic_Parent (Parent (Inst_Par)); - - elsif Nkind (Parent (Inst_Par)) = N_Defining_Program_Unit_Name - and then - Nkind (Parent (Parent (Inst_Par))) = N_Package_Specification - then - Gen_Par := Generic_Parent (Parent (Parent (Inst_Par))); - end if; - - elsif Ekind (Inst_Par) = E_Generic_Package - and then Nkind (Parent (Gen_Id)) = N_Formal_Package_Declaration - then - -- A formal package may be a real child package, and not the - -- implicit instance within a parent. In this case the child is - -- not visible and has to be retrieved explicitly as well. - - Gen_Par := Inst_Par; - end if; - - if Present (Gen_Par) then - - -- The prefix denotes an instantiation. The entity itself - -- may be a nested generic, or a child unit. - - E := Find_Generic_Child (Gen_Par, S); - - if Present (E) then - Change_Selected_Component_To_Expanded_Name (Gen_Id); - Set_Entity (Gen_Id, E); - Set_Etype (Gen_Id, Etype (E)); - Set_Entity (S, E); - Set_Etype (S, Etype (E)); - - -- Indicate that this is a reference to the parent - - if In_Extended_Main_Source_Unit (Gen_Id) then - Set_Is_Instantiated (Inst_Par); - end if; - - -- A common mistake is to replicate the naming scheme of - -- a hierarchy by instantiating a generic child directly, - -- rather than the implicit child in a parent instance: - - -- generic .. package Gpar is .. - -- generic .. package Gpar.Child is .. - -- package Par is new Gpar (); - - -- with Gpar.Child; - -- package Par.Child is new Gpar.Child (); - -- rather than Par.Child - - -- In this case the instantiation is within Par, which is - -- an instance, but Gpar does not denote Par because we are - -- not IN the instance of Gpar, so this is illegal. The test - -- below recognizes this particular case. - - if Is_Child_Unit (E) - and then not Comes_From_Source (Entity (Prefix (Gen_Id))) - and then (not In_Instance - or else Nkind (Parent (Parent (Gen_Id))) = - N_Compilation_Unit) - then - Error_Msg_N - ("prefix of generic child unit must be instance of parent", - Gen_Id); - end if; - - if not In_Open_Scopes (Inst_Par) - and then Nkind (Parent (Gen_Id)) not in - N_Generic_Renaming_Declaration - then - Install_Parent (Inst_Par); - Parent_Installed := True; - end if; - - else - -- If the generic parent does not contain an entity that - -- corresponds to the selector, the instance doesn't either. - -- Analyzing the node will yield the appropriate error message. - -- If the entity is not a child unit, then it is an inner - -- generic in the parent. - - Analyze (Gen_Id); - end if; - - else - Analyze (Gen_Id); - - if Is_Child_Unit (Entity (Gen_Id)) - and then - Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration - and then not In_Open_Scopes (Inst_Par) - then - Install_Parent (Inst_Par); - Parent_Installed := True; - end if; - end if; - - elsif Nkind (Gen_Id) = N_Expanded_Name then - - -- Entity already present, analyze prefix, whose meaning may be - -- an instance in the current context. If it is an instance of - -- a relative within another, the proper parent may still have - -- to be installed, if they are not of the same generation. - - Analyze (Prefix (Gen_Id)); - Inst_Par := Entity (Prefix (Gen_Id)); - - if In_Enclosing_Instance then - null; - - elsif Present (Entity (Gen_Id)) - and then Is_Child_Unit (Entity (Gen_Id)) - and then not In_Open_Scopes (Inst_Par) - then - Install_Parent (Inst_Par); - Parent_Installed := True; - end if; - - elsif In_Enclosing_Instance then - - -- The child unit is found in some enclosing scope - - null; - - else - Analyze (Gen_Id); - - -- If this is the renaming of the implicit child in a parent - -- instance, recover the parent name and install it. - - if Is_Entity_Name (Gen_Id) then - E := Entity (Gen_Id); - - if Is_Generic_Unit (E) - and then Nkind (Parent (E)) in N_Generic_Renaming_Declaration - and then Is_Child_Unit (Renamed_Object (E)) - and then Is_Generic_Unit (Scope (Renamed_Object (E))) - and then Nkind (Name (Parent (E))) = N_Expanded_Name - then - Rewrite (Gen_Id, - New_Copy_Tree (Name (Parent (E)))); - Inst_Par := Entity (Prefix (Gen_Id)); - - if not In_Open_Scopes (Inst_Par) then - Install_Parent (Inst_Par); - Parent_Installed := True; - end if; - - -- If it is a child unit of a non-generic parent, it may be - -- use-visible and given by a direct name. Install parent as - -- for other cases. - - elsif Is_Generic_Unit (E) - and then Is_Child_Unit (E) - and then - Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration - and then not Is_Generic_Unit (Scope (E)) - then - if not In_Open_Scopes (Scope (E)) then - Install_Parent (Scope (E)); - Parent_Installed := True; - end if; - end if; - end if; - end if; - end Check_Generic_Child_Unit; - - ----------------------------- - -- Check_Hidden_Child_Unit -- - ----------------------------- - - procedure Check_Hidden_Child_Unit - (N : Node_Id; - Gen_Unit : Entity_Id; - Act_Decl_Id : Entity_Id) - is - Gen_Id : constant Node_Id := Name (N); - - begin - if Is_Child_Unit (Gen_Unit) - and then Is_Child_Unit (Act_Decl_Id) - and then Nkind (Gen_Id) = N_Expanded_Name - and then Entity (Prefix (Gen_Id)) = Scope (Act_Decl_Id) - and then Chars (Gen_Unit) = Chars (Act_Decl_Id) - then - Error_Msg_Node_2 := Scope (Act_Decl_Id); - Error_Msg_NE - ("generic unit & is implicitly declared in &", - Defining_Unit_Name (N), Gen_Unit); - Error_Msg_N ("\instance must have different name", - Defining_Unit_Name (N)); - end if; - end Check_Hidden_Child_Unit; - - ------------------------ - -- Check_Private_View -- - ------------------------ - - procedure Check_Private_View (N : Node_Id) is - T : constant Entity_Id := Etype (N); - BT : Entity_Id; - - begin - -- Exchange views if the type was not private in the generic but is - -- private at the point of instantiation. Do not exchange views if - -- the scope of the type is in scope. This can happen if both generic - -- and instance are sibling units, or if type is defined in a parent. - -- In this case the visibility of the type will be correct for all - -- semantic checks. - - if Present (T) then - BT := Base_Type (T); - - if Is_Private_Type (T) - and then not Has_Private_View (N) - and then Present (Full_View (T)) - and then not In_Open_Scopes (Scope (T)) - then - -- In the generic, the full type was visible. Save the - -- private entity, for subsequent exchange. - - Switch_View (T); - - elsif Has_Private_View (N) - and then not Is_Private_Type (T) - and then not Has_Been_Exchanged (T) - and then Etype (Get_Associated_Node (N)) /= T - then - -- Only the private declaration was visible in the generic. If - -- the type appears in a subtype declaration, the subtype in the - -- instance must have a view compatible with that of its parent, - -- which must be exchanged (see corresponding code in Restore_ - -- Private_Views). Otherwise, if the type is defined in a parent - -- unit, leave full visibility within instance, which is safe. - - if In_Open_Scopes (Scope (Base_Type (T))) - and then not Is_Private_Type (Base_Type (T)) - and then Comes_From_Source (Base_Type (T)) - then - null; - - elsif Nkind (Parent (N)) = N_Subtype_Declaration - or else not In_Private_Part (Scope (Base_Type (T))) - then - Prepend_Elmt (T, Exchanged_Views); - Exchange_Declarations (Etype (Get_Associated_Node (N))); - end if; - - -- For composite types with inconsistent representation - -- exchange component types accordingly. - - elsif Is_Access_Type (T) - and then Is_Private_Type (Designated_Type (T)) - and then not Has_Private_View (N) - and then Present (Full_View (Designated_Type (T))) - then - Switch_View (Designated_Type (T)); - - elsif Is_Array_Type (T) - and then Is_Private_Type (Component_Type (T)) - and then not Has_Private_View (N) - and then Present (Full_View (Component_Type (T))) - then - Switch_View (Component_Type (T)); - - elsif Is_Private_Type (T) - and then Present (Full_View (T)) - and then Is_Array_Type (Full_View (T)) - and then Is_Private_Type (Component_Type (Full_View (T))) - then - Switch_View (T); - - -- Finally, a non-private subtype may have a private base type, - -- which must be exchanged for consistency. This can happen when - -- instantiating a package body, when the scope stack is empty - -- but in fact the subtype and the base type are declared in an - -- enclosing scope. - - elsif not Is_Private_Type (T) - and then not Has_Private_View (N) - and then Is_Private_Type (Base_Type (T)) - and then Present (Full_View (BT)) - and then not Is_Generic_Type (BT) - and then not In_Open_Scopes (BT) - then - Prepend_Elmt (Full_View (BT), Exchanged_Views); - Exchange_Declarations (BT); - end if; - end if; - end Check_Private_View; - - -------------------------- - -- Contains_Instance_Of -- - -------------------------- - - function Contains_Instance_Of - (Inner : Entity_Id; - Outer : Entity_Id; - N : Node_Id) return Boolean - is - Elmt : Elmt_Id; - Scop : Entity_Id; - - begin - Scop := Outer; - - -- Verify that there are no circular instantiations. We check whether - -- the unit contains an instance of the current scope or some enclosing - -- scope (in case one of the instances appears in a subunit). Longer - -- circularities involving subunits might seem too pathological to - -- consider, but they were not too pathological for the authors of - -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all - -- enclosing generic scopes as containing an instance. - - loop - -- Within a generic subprogram body, the scope is not generic, to - -- allow for recursive subprograms. Use the declaration to determine - -- whether this is a generic unit. - - if Ekind (Scop) = E_Generic_Package - or else (Is_Subprogram (Scop) - and then Nkind (Unit_Declaration_Node (Scop)) = - N_Generic_Subprogram_Declaration) - then - Elmt := First_Elmt (Inner_Instances (Inner)); - - while Present (Elmt) loop - if Node (Elmt) = Scop then - Error_Msg_Node_2 := Inner; - Error_Msg_NE - ("circular Instantiation: & instantiated within &!", - N, Scop); - return True; - - elsif Node (Elmt) = Inner then - return True; - - elsif Contains_Instance_Of (Node (Elmt), Scop, N) then - Error_Msg_Node_2 := Inner; - Error_Msg_NE - ("circular Instantiation: & instantiated within &!", - N, Node (Elmt)); - return True; - end if; - - Next_Elmt (Elmt); - end loop; - - -- Indicate that Inner is being instantiated within Scop - - Append_Elmt (Inner, Inner_Instances (Scop)); - end if; - - if Scop = Standard_Standard then - exit; - else - Scop := Scope (Scop); - end if; - end loop; - - return False; - end Contains_Instance_Of; - - ----------------------- - -- Copy_Generic_Node -- - ----------------------- - - function Copy_Generic_Node - (N : Node_Id; - Parent_Id : Node_Id; - Instantiating : Boolean) return Node_Id - is - Ent : Entity_Id; - New_N : Node_Id; - - function Copy_Generic_Descendant (D : Union_Id) return Union_Id; - -- Check the given value of one of the Fields referenced by the - -- current node to determine whether to copy it recursively. The - -- field may hold a Node_Id, a List_Id, or an Elist_Id, or a plain - -- value (Sloc, Uint, Char) in which case it need not be copied. - - procedure Copy_Descendants; - -- Common utility for various nodes - - function Copy_Generic_Elist (E : Elist_Id) return Elist_Id; - -- Make copy of element list - - function Copy_Generic_List - (L : List_Id; - Parent_Id : Node_Id) return List_Id; - -- Apply Copy_Node recursively to the members of a node list - - function In_Defining_Unit_Name (Nam : Node_Id) return Boolean; - -- True if an identifier is part of the defining program unit name - -- of a child unit. The entity of such an identifier must be kept - -- (for ASIS use) even though as the name of an enclosing generic - -- it would otherwise not be preserved in the generic tree. - - ---------------------- - -- Copy_Descendants -- - ---------------------- - - procedure Copy_Descendants is - - use Atree.Unchecked_Access; - -- This code section is part of the implementation of an untyped - -- tree traversal, so it needs direct access to node fields. - - begin - Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N))); - Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N))); - Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N))); - Set_Field4 (New_N, Copy_Generic_Descendant (Field4 (N))); - Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N))); - end Copy_Descendants; - - ----------------------------- - -- Copy_Generic_Descendant -- - ----------------------------- - - function Copy_Generic_Descendant (D : Union_Id) return Union_Id is - begin - if D = Union_Id (Empty) then - return D; - - elsif D in Node_Range then - return Union_Id - (Copy_Generic_Node (Node_Id (D), New_N, Instantiating)); - - elsif D in List_Range then - return Union_Id (Copy_Generic_List (List_Id (D), New_N)); - - elsif D in Elist_Range then - return Union_Id (Copy_Generic_Elist (Elist_Id (D))); - - -- Nothing else is copyable (e.g. Uint values), return as is - - else - return D; - end if; - end Copy_Generic_Descendant; - - ------------------------ - -- Copy_Generic_Elist -- - ------------------------ - - function Copy_Generic_Elist (E : Elist_Id) return Elist_Id is - M : Elmt_Id; - L : Elist_Id; - - begin - if Present (E) then - L := New_Elmt_List; - M := First_Elmt (E); - while Present (M) loop - Append_Elmt - (Copy_Generic_Node (Node (M), Empty, Instantiating), L); - Next_Elmt (M); - end loop; - - return L; - - else - return No_Elist; - end if; - end Copy_Generic_Elist; - - ----------------------- - -- Copy_Generic_List -- - ----------------------- - - function Copy_Generic_List - (L : List_Id; - Parent_Id : Node_Id) return List_Id - is - N : Node_Id; - New_L : List_Id; - - begin - if Present (L) then - New_L := New_List; - Set_Parent (New_L, Parent_Id); - - N := First (L); - while Present (N) loop - Append (Copy_Generic_Node (N, Empty, Instantiating), New_L); - Next (N); - end loop; - - return New_L; - - else - return No_List; - end if; - end Copy_Generic_List; - - --------------------------- - -- In_Defining_Unit_Name -- - --------------------------- - - function In_Defining_Unit_Name (Nam : Node_Id) return Boolean is - begin - return Present (Parent (Nam)) - and then (Nkind (Parent (Nam)) = N_Defining_Program_Unit_Name - or else - (Nkind (Parent (Nam)) = N_Expanded_Name - and then In_Defining_Unit_Name (Parent (Nam)))); - end In_Defining_Unit_Name; - - -- Start of processing for Copy_Generic_Node - - begin - if N = Empty then - return N; - end if; - - New_N := New_Copy (N); - - if Instantiating then - Adjust_Instantiation_Sloc (New_N, S_Adjustment); - end if; - - if not Is_List_Member (N) then - Set_Parent (New_N, Parent_Id); - end if; - - -- If defining identifier, then all fields have been copied already - - if Nkind (New_N) in N_Entity then - null; - - -- Special casing for identifiers and other entity names and operators - - elsif Nkind (New_N) = N_Identifier - or else Nkind (New_N) = N_Character_Literal - or else Nkind (New_N) = N_Expanded_Name - or else Nkind (New_N) = N_Operator_Symbol - or else Nkind (New_N) in N_Op - then - if not Instantiating then - - -- Link both nodes in order to assign subsequently the - -- entity of the copy to the original node, in case this - -- is a global reference. - - Set_Associated_Node (N, New_N); - - -- If we are within an instantiation, this is a nested generic - -- that has already been analyzed at the point of definition. We - -- must preserve references that were global to the enclosing - -- parent at that point. Other occurrences, whether global or - -- local to the current generic, must be resolved anew, so we - -- reset the entity in the generic copy. A global reference has - -- a smaller depth than the parent, or else the same depth in - -- case both are distinct compilation units. - - -- It is also possible for Current_Instantiated_Parent to be - -- defined, and for this not to be a nested generic, namely - -- if the unit is loaded through Rtsfind. In that case, the - -- entity of New_N is only a link to the associated node, and - -- not a defining occurrence. - - -- The entities for parent units in the defining_program_unit - -- of a generic child unit are established when the context of - -- the unit is first analyzed, before the generic copy is made. - -- They are preserved in the copy for use in ASIS queries. - - Ent := Entity (New_N); - - if No (Current_Instantiated_Parent.Gen_Id) then - if No (Ent) - or else Nkind (Ent) /= N_Defining_Identifier - or else not In_Defining_Unit_Name (N) - then - Set_Associated_Node (New_N, Empty); - end if; - - elsif No (Ent) - or else - not (Nkind (Ent) = N_Defining_Identifier - or else - Nkind (Ent) = N_Defining_Character_Literal - or else - Nkind (Ent) = N_Defining_Operator_Symbol) - or else No (Scope (Ent)) - or else Scope (Ent) = Current_Instantiated_Parent.Gen_Id - or else (Scope_Depth (Scope (Ent)) > - Scope_Depth (Current_Instantiated_Parent.Gen_Id) - and then - Get_Source_Unit (Ent) = - Get_Source_Unit (Current_Instantiated_Parent.Gen_Id)) - then - Set_Associated_Node (New_N, Empty); - end if; - - -- Case of instantiating identifier or some other name or operator - - else - -- If the associated node is still defined, the entity in - -- it is global, and must be copied to the instance. - -- If this copy is being made for a body to inline, it is - -- applied to an instantiated tree, and the entity is already - -- present and must be also preserved. - - declare - Assoc : constant Node_Id := Get_Associated_Node (N); - begin - if Present (Assoc) then - if Nkind (Assoc) = Nkind (N) then - Set_Entity (New_N, Entity (Assoc)); - Check_Private_View (N); - - elsif Nkind (Assoc) = N_Function_Call then - Set_Entity (New_N, Entity (Name (Assoc))); - - elsif (Nkind (Assoc) = N_Defining_Identifier - or else Nkind (Assoc) = N_Defining_Character_Literal - or else Nkind (Assoc) = N_Defining_Operator_Symbol) - and then Expander_Active - then - -- Inlining case: we are copying a tree that contains - -- global entities, which are preserved in the copy - -- to be used for subsequent inlining. - - null; - - else - Set_Entity (New_N, Empty); - end if; - end if; - end; - end if; - - -- For expanded name, we must copy the Prefix and Selector_Name - - if Nkind (N) = N_Expanded_Name then - Set_Prefix - (New_N, Copy_Generic_Node (Prefix (N), New_N, Instantiating)); - - Set_Selector_Name (New_N, - Copy_Generic_Node (Selector_Name (N), New_N, Instantiating)); - - -- For operators, we must copy the right operand - - elsif Nkind (N) in N_Op then - Set_Right_Opnd (New_N, - Copy_Generic_Node (Right_Opnd (N), New_N, Instantiating)); - - -- And for binary operators, the left operand as well - - if Nkind (N) in N_Binary_Op then - Set_Left_Opnd (New_N, - Copy_Generic_Node (Left_Opnd (N), New_N, Instantiating)); - end if; - end if; - - -- Special casing for stubs - - elsif Nkind (N) in N_Body_Stub then - - -- In any case, we must copy the specification or defining - -- identifier as appropriate. - - if Nkind (N) = N_Subprogram_Body_Stub then - Set_Specification (New_N, - Copy_Generic_Node (Specification (N), New_N, Instantiating)); - - else - Set_Defining_Identifier (New_N, - Copy_Generic_Node - (Defining_Identifier (N), New_N, Instantiating)); - end if; - - -- If we are not instantiating, then this is where we load and - -- analyze subunits, i.e. at the point where the stub occurs. A - -- more permissivle system might defer this analysis to the point - -- of instantiation, but this seems to complicated for now. - - if not Instantiating then - declare - Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N); - Subunit : Node_Id; - Unum : Unit_Number_Type; - New_Body : Node_Id; - - begin - Unum := - Load_Unit - (Load_Name => Subunit_Name, - Required => False, - Subunit => True, - Error_Node => N); - - -- If the proper body is not found, a warning message will - -- be emitted when analyzing the stub, or later at the the - -- point of instantiation. Here we just leave the stub as is. - - if Unum = No_Unit then - Subunits_Missing := True; - goto Subunit_Not_Found; - end if; - - Subunit := Cunit (Unum); - - if Nkind (Unit (Subunit)) /= N_Subunit then - Error_Msg_Sloc := Sloc (N); - Error_Msg_N - ("expected SEPARATE subunit to complete stub at#," - & " found child unit", Subunit); - goto Subunit_Not_Found; - end if; - - -- We must create a generic copy of the subunit, in order - -- to perform semantic analysis on it, and we must replace - -- the stub in the original generic unit with the subunit, - -- in order to preserve non-local references within. - - -- Only the proper body needs to be copied. Library_Unit and - -- context clause are simply inherited by the generic copy. - -- Note that the copy (which may be recursive if there are - -- nested subunits) must be done first, before attaching it - -- to the enclosing generic. - - New_Body := - Copy_Generic_Node - (Proper_Body (Unit (Subunit)), - Empty, Instantiating => False); - - -- Now place the original proper body in the original - -- generic unit. This is a body, not a compilation unit. - - Rewrite (N, Proper_Body (Unit (Subunit))); - Set_Is_Compilation_Unit (Defining_Entity (N), False); - Set_Was_Originally_Stub (N); - - -- Finally replace the body of the subunit with its copy, - -- and make this new subunit into the library unit of the - -- generic copy, which does not have stubs any longer. - - Set_Proper_Body (Unit (Subunit), New_Body); - Set_Library_Unit (New_N, Subunit); - Inherit_Context (Unit (Subunit), N); - end; - - -- If we are instantiating, this must be an error case, since - -- otherwise we would have replaced the stub node by the proper - -- body that corresponds. So just ignore it in the copy (i.e. - -- we have copied it, and that is good enough). - - else - null; - end if; - - <<Subunit_Not_Found>> null; - - -- If the node is a compilation unit, it is the subunit of a stub, - -- which has been loaded already (see code below). In this case, - -- the library unit field of N points to the parent unit (which - -- is a compilation unit) and need not (and cannot!) be copied. - - -- When the proper body of the stub is analyzed, thie library_unit - -- link is used to establish the proper context (see sem_ch10). - - -- The other fields of a compilation unit are copied as usual - - elsif Nkind (N) = N_Compilation_Unit then - - -- This code can only be executed when not instantiating, because - -- in the copy made for an instantiation, the compilation unit - -- node has disappeared at the point that a stub is replaced by - -- its proper body. - - pragma Assert (not Instantiating); - - Set_Context_Items (New_N, - Copy_Generic_List (Context_Items (N), New_N)); - - Set_Unit (New_N, - Copy_Generic_Node (Unit (N), New_N, False)); - - Set_First_Inlined_Subprogram (New_N, - Copy_Generic_Node - (First_Inlined_Subprogram (N), New_N, False)); - - Set_Aux_Decls_Node (New_N, - Copy_Generic_Node (Aux_Decls_Node (N), New_N, False)); - - -- For an assignment node, the assignment is known to be semantically - -- legal if we are instantiating the template. This avoids incorrect - -- diagnostics in generated code. - - elsif Nkind (N) = N_Assignment_Statement then - - -- Copy name and expression fields in usual manner - - Set_Name (New_N, - Copy_Generic_Node (Name (N), New_N, Instantiating)); - - Set_Expression (New_N, - Copy_Generic_Node (Expression (N), New_N, Instantiating)); - - if Instantiating then - Set_Assignment_OK (Name (New_N), True); - end if; - - elsif Nkind (N) = N_Aggregate - or else Nkind (N) = N_Extension_Aggregate - then - - if not Instantiating then - Set_Associated_Node (N, New_N); - - else - if Present (Get_Associated_Node (N)) - and then Nkind (Get_Associated_Node (N)) = Nkind (N) - then - -- In the generic the aggregate has some composite type. If at - -- the point of instantiation the type has a private view, - -- install the full view (and that of its ancestors, if any). - - declare - T : Entity_Id := (Etype (Get_Associated_Node (New_N))); - Rt : Entity_Id; - - begin - if Present (T) - and then Is_Private_Type (T) - then - Switch_View (T); - end if; - - if Present (T) - and then Is_Tagged_Type (T) - and then Is_Derived_Type (T) - then - Rt := Root_Type (T); - - loop - T := Etype (T); - - if Is_Private_Type (T) then - Switch_View (T); - end if; - - exit when T = Rt; - end loop; - end if; - end; - end if; - end if; - - -- Do not copy the associated node, which points to - -- the generic copy of the aggregate. - - declare - use Atree.Unchecked_Access; - -- This code section is part of the implementation of an untyped - -- tree traversal, so it needs direct access to node fields. - - begin - Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N))); - Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N))); - Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N))); - Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N))); - end; - - -- Allocators do not have an identifier denoting the access type, - -- so we must locate it through the expression to check whether - -- the views are consistent. - - elsif Nkind (N) = N_Allocator - and then Nkind (Expression (N)) = N_Qualified_Expression - and then Is_Entity_Name (Subtype_Mark (Expression (N))) - and then Instantiating - then - declare - T : constant Node_Id := - Get_Associated_Node (Subtype_Mark (Expression (N))); - Acc_T : Entity_Id; - - begin - if Present (T) then - -- Retrieve the allocator node in the generic copy - - Acc_T := Etype (Parent (Parent (T))); - if Present (Acc_T) - and then Is_Private_Type (Acc_T) - then - Switch_View (Acc_T); - end if; - end if; - - Copy_Descendants; - end; - - -- For a proper body, we must catch the case of a proper body that - -- replaces a stub. This represents the point at which a separate - -- compilation unit, and hence template file, may be referenced, so - -- we must make a new source instantiation entry for the template - -- of the subunit, and ensure that all nodes in the subunit are - -- adjusted using this new source instantiation entry. - - elsif Nkind (N) in N_Proper_Body then - declare - Save_Adjustment : constant Sloc_Adjustment := S_Adjustment; - - begin - if Instantiating and then Was_Originally_Stub (N) then - Create_Instantiation_Source - (Instantiation_Node, - Defining_Entity (N), - False, - S_Adjustment); - end if; - - -- Now copy the fields of the proper body, using the new - -- adjustment factor if one was needed as per test above. - - Copy_Descendants; - - -- Restore the original adjustment factor in case changed - - S_Adjustment := Save_Adjustment; - end; - - -- Don't copy Ident or Comment pragmas, since the comment belongs - -- to the generic unit, not to the instantiating unit. - - elsif Nkind (N) = N_Pragma - and then Instantiating - then - declare - Prag_Id : constant Pragma_Id := Get_Pragma_Id (Chars (N)); - - begin - if Prag_Id = Pragma_Ident - or else Prag_Id = Pragma_Comment - then - New_N := Make_Null_Statement (Sloc (N)); - - else - Copy_Descendants; - end if; - end; - - elsif Nkind (N) = N_Integer_Literal - or else Nkind (N) = N_Real_Literal - then - -- No descendant fields need traversing - - null; - - -- For the remaining nodes, copy recursively their descendants - - else - Copy_Descendants; - - if Instantiating - and then Nkind (N) = N_Subprogram_Body - then - Set_Generic_Parent (Specification (New_N), N); - end if; - end if; - - return New_N; - end Copy_Generic_Node; - - ---------------------------- - -- Denotes_Formal_Package -- - ---------------------------- - - function Denotes_Formal_Package - (Pack : Entity_Id; - On_Exit : Boolean := False) return Boolean - is - Par : Entity_Id; - Scop : constant Entity_Id := Scope (Pack); - E : Entity_Id; - - begin - if On_Exit then - Par := - Instance_Envs.Table - (Instance_Envs.Last).Instantiated_Parent.Act_Id; - else - Par := Current_Instantiated_Parent.Act_Id; - end if; - - if Ekind (Scop) = E_Generic_Package - or else Nkind (Unit_Declaration_Node (Scop)) = - N_Generic_Subprogram_Declaration - then - return True; - - elsif Nkind (Parent (Pack)) = N_Formal_Package_Declaration then - return True; - - elsif No (Par) then - return False; - - else - -- Check whether this package is associated with a formal - -- package of the enclosing instantiation. Iterate over the - -- list of renamings. - - E := First_Entity (Par); - while Present (E) loop - if Ekind (E) /= E_Package - or else Nkind (Parent (E)) /= N_Package_Renaming_Declaration - then - null; - elsif Renamed_Object (E) = Par then - return False; - - elsif Renamed_Object (E) = Pack then - return True; - end if; - - Next_Entity (E); - end loop; - - return False; - end if; - end Denotes_Formal_Package; - - ----------------- - -- End_Generic -- - ----------------- - - procedure End_Generic is - begin - -- ??? More things could be factored out in this - -- routine. Should probably be done at a later stage. - - Inside_A_Generic := Generic_Flags.Table (Generic_Flags.Last); - Generic_Flags.Decrement_Last; - - Expander_Mode_Restore; - end End_Generic; - - ---------------------- - -- Find_Actual_Type -- - ---------------------- - - function Find_Actual_Type - (Typ : Entity_Id; - Gen_Scope : Entity_Id) return Entity_Id - is - T : Entity_Id; - - begin - if not Is_Child_Unit (Gen_Scope) then - return Get_Instance_Of (Typ); - - elsif not Is_Generic_Type (Typ) - or else Scope (Typ) = Gen_Scope - then - return Get_Instance_Of (Typ); - - else - T := Current_Entity (Typ); - while Present (T) loop - if In_Open_Scopes (Scope (T)) then - return T; - end if; - - T := Homonym (T); - end loop; - - return Typ; - end if; - end Find_Actual_Type; - - ---------------------------- - -- Freeze_Subprogram_Body -- - ---------------------------- - - procedure Freeze_Subprogram_Body - (Inst_Node : Node_Id; - Gen_Body : Node_Id; - Pack_Id : Entity_Id) - is - F_Node : Node_Id; - Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node); - Par : constant Entity_Id := Scope (Gen_Unit); - Enc_G : Entity_Id; - Enc_I : Node_Id; - E_G_Id : Entity_Id; - - function Earlier (N1, N2 : Node_Id) return Boolean; - -- Yields True if N1 and N2 appear in the same compilation unit, - -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right - -- traversal of the tree for the unit. - - function Enclosing_Body (N : Node_Id) return Node_Id; - -- Find innermost package body that encloses the given node, and which - -- is not a compilation unit. Freeze nodes for the instance, or for its - -- enclosing body, may be inserted after the enclosing_body of the - -- generic unit. - - function Package_Freeze_Node (B : Node_Id) return Node_Id; - -- Find entity for given package body, and locate or create a freeze - -- node for it. - - function True_Parent (N : Node_Id) return Node_Id; - -- For a subunit, return parent of corresponding stub - - ------------- - -- Earlier -- - ------------- - - function Earlier (N1, N2 : Node_Id) return Boolean is - D1 : Integer := 0; - D2 : Integer := 0; - P1 : Node_Id := N1; - P2 : Node_Id := N2; - - procedure Find_Depth (P : in out Node_Id; D : in out Integer); - -- Find distance from given node to enclosing compilation unit - - ---------------- - -- Find_Depth -- - ---------------- - - procedure Find_Depth (P : in out Node_Id; D : in out Integer) is - begin - while Present (P) - and then Nkind (P) /= N_Compilation_Unit - loop - P := True_Parent (P); - D := D + 1; - end loop; - end Find_Depth; - - -- Start of procesing for Earlier - - begin - Find_Depth (P1, D1); - Find_Depth (P2, D2); - - if P1 /= P2 then - return False; - else - P1 := N1; - P2 := N2; - end if; - - while D1 > D2 loop - P1 := True_Parent (P1); - D1 := D1 - 1; - end loop; - - while D2 > D1 loop - P2 := True_Parent (P2); - D2 := D2 - 1; - end loop; - - -- At this point P1 and P2 are at the same distance from the root. - -- We examine their parents until we find a common declarative - -- list, at which point we can establish their relative placement - -- by comparing their ultimate slocs. If we reach the root, - -- N1 and N2 do not descend from the same declarative list (e.g. - -- one is nested in the declarative part and the other is in a block - -- in the statement part) and the earlier one is already frozen. - - while not Is_List_Member (P1) - or else not Is_List_Member (P2) - or else List_Containing (P1) /= List_Containing (P2) - loop - P1 := True_Parent (P1); - P2 := True_Parent (P2); - - if Nkind (Parent (P1)) = N_Subunit then - P1 := Corresponding_Stub (Parent (P1)); - end if; - - if Nkind (Parent (P2)) = N_Subunit then - P2 := Corresponding_Stub (Parent (P2)); - end if; - - if P1 = P2 then - return False; - end if; - end loop; - - return - Top_Level_Location (Sloc (P1)) < Top_Level_Location (Sloc (P2)); - end Earlier; - - -------------------- - -- Enclosing_Body -- - -------------------- - - function Enclosing_Body (N : Node_Id) return Node_Id is - P : Node_Id := Parent (N); - - begin - while Present (P) - and then Nkind (Parent (P)) /= N_Compilation_Unit - loop - if Nkind (P) = N_Package_Body then - - if Nkind (Parent (P)) = N_Subunit then - return Corresponding_Stub (Parent (P)); - else - return P; - end if; - end if; - - P := True_Parent (P); - end loop; - - return Empty; - end Enclosing_Body; - - ------------------------- - -- Package_Freeze_Node -- - ------------------------- - - function Package_Freeze_Node (B : Node_Id) return Node_Id is - Id : Entity_Id; - - begin - if Nkind (B) = N_Package_Body then - Id := Corresponding_Spec (B); - - else pragma Assert (Nkind (B) = N_Package_Body_Stub); - Id := Corresponding_Spec (Proper_Body (Unit (Library_Unit (B)))); - end if; - - Ensure_Freeze_Node (Id); - return Freeze_Node (Id); - end Package_Freeze_Node; - - ----------------- - -- True_Parent -- - ----------------- - - function True_Parent (N : Node_Id) return Node_Id is - begin - if Nkind (Parent (N)) = N_Subunit then - return Parent (Corresponding_Stub (Parent (N))); - else - return Parent (N); - end if; - end True_Parent; - - -- Start of processing of Freeze_Subprogram_Body - - begin - -- If the instance and the generic body appear within the same - -- unit, and the instance preceeds the generic, the freeze node for - -- the instance must appear after that of the generic. If the generic - -- is nested within another instance I2, then current instance must - -- be frozen after I2. In both cases, the freeze nodes are those of - -- enclosing packages. Otherwise, the freeze node is placed at the end - -- of the current declarative part. - - Enc_G := Enclosing_Body (Gen_Body); - Enc_I := Enclosing_Body (Inst_Node); - Ensure_Freeze_Node (Pack_Id); - F_Node := Freeze_Node (Pack_Id); - - if Is_Generic_Instance (Par) - and then Present (Freeze_Node (Par)) - and then - In_Same_Declarative_Part (Freeze_Node (Par), Inst_Node) - then - if ABE_Is_Certain (Get_Package_Instantiation_Node (Par)) then - - -- The parent was a premature instantiation. Insert freeze - -- node at the end the current declarative part. - - Insert_After_Last_Decl (Inst_Node, F_Node); - - else - Insert_After (Freeze_Node (Par), F_Node); - end if; - - -- The body enclosing the instance should be frozen after the body - -- that includes the generic, because the body of the instance may - -- make references to entities therein. If the two are not in the - -- same declarative part, or if the one enclosing the instance is - -- frozen already, freeze the instance at the end of the current - -- declarative part. - - elsif Is_Generic_Instance (Par) - and then Present (Freeze_Node (Par)) - and then Present (Enc_I) - then - if In_Same_Declarative_Part (Freeze_Node (Par), Enc_I) - or else - (Nkind (Enc_I) = N_Package_Body - and then - In_Same_Declarative_Part (Freeze_Node (Par), Parent (Enc_I))) - then - -- The enclosing package may contain several instances. Rather - -- than computing the earliest point at which to insert its - -- freeze node, we place it at the end of the declarative part - -- of the parent of the generic. - - Insert_After_Last_Decl - (Freeze_Node (Par), Package_Freeze_Node (Enc_I)); - end if; - - Insert_After_Last_Decl (Inst_Node, F_Node); - - elsif Present (Enc_G) - and then Present (Enc_I) - and then Enc_G /= Enc_I - and then Earlier (Inst_Node, Gen_Body) - then - if Nkind (Enc_G) = N_Package_Body then - E_G_Id := Corresponding_Spec (Enc_G); - else pragma Assert (Nkind (Enc_G) = N_Package_Body_Stub); - E_G_Id := - Corresponding_Spec (Proper_Body (Unit (Library_Unit (Enc_G)))); - end if; - - -- Freeze package that encloses instance, and place node after - -- package that encloses generic. If enclosing package is already - -- frozen we have to assume it is at the proper place. This may - -- be a potential ABE that requires dynamic checking. - - Insert_After_Last_Decl (Enc_G, Package_Freeze_Node (Enc_I)); - - -- Freeze enclosing subunit before instance - - Ensure_Freeze_Node (E_G_Id); - - if not Is_List_Member (Freeze_Node (E_G_Id)) then - Insert_After (Enc_G, Freeze_Node (E_G_Id)); - end if; - - Insert_After_Last_Decl (Inst_Node, F_Node); - - else - -- If none of the above, insert freeze node at the end of the - -- current declarative part. - - Insert_After_Last_Decl (Inst_Node, F_Node); - end if; - end Freeze_Subprogram_Body; - - ---------------- - -- Get_Gen_Id -- - ---------------- - - function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id is - begin - return Generic_Renamings.Table (E).Gen_Id; - end Get_Gen_Id; - - --------------------- - -- Get_Instance_Of -- - --------------------- - - function Get_Instance_Of (A : Entity_Id) return Entity_Id is - Res : constant Assoc_Ptr := Generic_Renamings_HTable.Get (A); - - begin - if Res /= Assoc_Null then - return Generic_Renamings.Table (Res).Act_Id; - else - -- On exit, entity is not instantiated: not a generic parameter, - -- or else parameter of an inner generic unit. - - return A; - end if; - end Get_Instance_Of; - - ------------------------------------ - -- Get_Package_Instantiation_Node -- - ------------------------------------ - - function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id is - Decl : Node_Id := Unit_Declaration_Node (A); - Inst : Node_Id; - - begin - -- If the Package_Instantiation attribute has been set on the package - -- entity, then use it directly when it (or its Original_Node) refers - -- to an N_Package_Instantiation node. In principle it should be - -- possible to have this field set in all cases, which should be - -- investigated, and would allow this function to be significantly - -- simplified. ??? - - if Present (Package_Instantiation (A)) then - if Nkind (Package_Instantiation (A)) = N_Package_Instantiation then - return Package_Instantiation (A); - - elsif Nkind (Original_Node (Package_Instantiation (A))) - = N_Package_Instantiation - then - return Original_Node (Package_Instantiation (A)); - end if; - end if; - - -- If the instantiation is a compilation unit that does not need a - -- body then the instantiation node has been rewritten as a package - -- declaration for the instance, and we return the original node. - - -- If it is a compilation unit and the instance node has not been - -- rewritten, then it is still the unit of the compilation. Finally, - -- if a body is present, this is a parent of the main unit whose body - -- has been compiled for inlining purposes, and the instantiation node - -- has been rewritten with the instance body. - - -- Otherwise the instantiation node appears after the declaration. - -- If the entity is a formal package, the declaration may have been - -- rewritten as a generic declaration (in the case of a formal with a - -- box) or left as a formal package declaration if it has actuals, and - -- is found with a forward search. - - if Nkind (Parent (Decl)) = N_Compilation_Unit then - if Nkind (Decl) = N_Package_Declaration - and then Present (Corresponding_Body (Decl)) - then - Decl := Unit_Declaration_Node (Corresponding_Body (Decl)); - end if; - - if Nkind (Original_Node (Decl)) = N_Package_Instantiation then - return Original_Node (Decl); - else - return Unit (Parent (Decl)); - end if; - - elsif Nkind (Decl) = N_Generic_Package_Declaration - and then Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration - then - return Original_Node (Decl); - - else - Inst := Next (Decl); - while Nkind (Inst) /= N_Package_Instantiation - and then Nkind (Inst) /= N_Formal_Package_Declaration - loop - Next (Inst); - end loop; - - return Inst; - end if; - end Get_Package_Instantiation_Node; - - ------------------------ - -- Has_Been_Exchanged -- - ------------------------ - - function Has_Been_Exchanged (E : Entity_Id) return Boolean is - Next : Elmt_Id := First_Elmt (Exchanged_Views); - - begin - while Present (Next) loop - if Full_View (Node (Next)) = E then - return True; - end if; - - Next_Elmt (Next); - end loop; - - return False; - end Has_Been_Exchanged; - - ---------- - -- Hash -- - ---------- - - function Hash (F : Entity_Id) return HTable_Range is - begin - return HTable_Range (F mod HTable_Size); - end Hash; - - ------------------------ - -- Hide_Current_Scope -- - ------------------------ - - procedure Hide_Current_Scope is - C : constant Entity_Id := Current_Scope; - E : Entity_Id; - - begin - Set_Is_Hidden_Open_Scope (C); - E := First_Entity (C); - - while Present (E) loop - if Is_Immediately_Visible (E) then - Set_Is_Immediately_Visible (E, False); - Append_Elmt (E, Hidden_Entities); - end if; - - Next_Entity (E); - end loop; - - -- Make the scope name invisible as well. This is necessary, but - -- might conflict with calls to Rtsfind later on, in case the scope - -- is a predefined one. There is no clean solution to this problem, so - -- for now we depend on the user not redefining Standard itself in one - -- of the parent units. - - if Is_Immediately_Visible (C) - and then C /= Standard_Standard - then - Set_Is_Immediately_Visible (C, False); - Append_Elmt (C, Hidden_Entities); - end if; - - end Hide_Current_Scope; - - -------------- - -- Init_Env -- - -------------- - - procedure Init_Env is - Saved : Instance_Env; - - begin - Saved.Ada_Version := Ada_Version; - Saved.Ada_Version_Explicit := Ada_Version_Explicit; - Saved.Instantiated_Parent := Current_Instantiated_Parent; - Saved.Exchanged_Views := Exchanged_Views; - Saved.Hidden_Entities := Hidden_Entities; - Saved.Current_Sem_Unit := Current_Sem_Unit; - Saved.Parent_Unit_Visible := Parent_Unit_Visible; - Saved.Instance_Parent_Unit := Instance_Parent_Unit; - Instance_Envs.Increment_Last; - Instance_Envs.Table (Instance_Envs.Last) := Saved; - - Exchanged_Views := New_Elmt_List; - Hidden_Entities := New_Elmt_List; - - -- Make dummy entry for Instantiated parent. If generic unit is - -- legal, this is set properly in Set_Instance_Env. - - Current_Instantiated_Parent := - (Current_Scope, Current_Scope, Assoc_Null); - end Init_Env; - - ------------------------------ - -- In_Same_Declarative_Part -- - ------------------------------ - - function In_Same_Declarative_Part - (F_Node : Node_Id; - Inst : Node_Id) return Boolean - is - Decls : constant Node_Id := Parent (F_Node); - Nod : Node_Id := Parent (Inst); - - begin - while Present (Nod) loop - if Nod = Decls then - return True; - - elsif Nkind (Nod) = N_Subprogram_Body - or else Nkind (Nod) = N_Package_Body - or else Nkind (Nod) = N_Task_Body - or else Nkind (Nod) = N_Protected_Body - or else Nkind (Nod) = N_Block_Statement - then - return False; - - elsif Nkind (Nod) = N_Subunit then - Nod := Corresponding_Stub (Nod); - - elsif Nkind (Nod) = N_Compilation_Unit then - return False; - else - Nod := Parent (Nod); - end if; - end loop; - - return False; - end In_Same_Declarative_Part; - - --------------------- - -- In_Main_Context -- - --------------------- - - function In_Main_Context (E : Entity_Id) return Boolean is - Context : List_Id; - Clause : Node_Id; - Nam : Node_Id; - - begin - if not Is_Compilation_Unit (E) - or else Ekind (E) /= E_Package - or else In_Private_Part (E) - then - return False; - end if; - - Context := Context_Items (Cunit (Main_Unit)); - - Clause := First (Context); - while Present (Clause) loop - if Nkind (Clause) = N_With_Clause then - Nam := Name (Clause); - - -- If the current scope is part of the context of the main unit, - -- analysis of the corresponding with_clause is not complete, and - -- the entity is not set. We use the Chars field directly, which - -- might produce false positives in rare cases, but guarantees - -- that we produce all the instance bodies we will need. - - if (Nkind (Nam) = N_Identifier - and then Chars (Nam) = Chars (E)) - or else (Nkind (Nam) = N_Selected_Component - and then Chars (Selector_Name (Nam)) = Chars (E)) - then - return True; - end if; - end if; - - Next (Clause); - end loop; - - return False; - end In_Main_Context; - - --------------------- - -- Inherit_Context -- - --------------------- - - procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id) is - Current_Context : List_Id; - Current_Unit : Node_Id; - Item : Node_Id; - New_I : Node_Id; - - begin - if Nkind (Parent (Gen_Decl)) = N_Compilation_Unit then - - -- The inherited context is attached to the enclosing compilation - -- unit. This is either the main unit, or the declaration for the - -- main unit (in case the instantation appears within the package - -- declaration and the main unit is its body). - - Current_Unit := Parent (Inst); - while Present (Current_Unit) - and then Nkind (Current_Unit) /= N_Compilation_Unit - loop - Current_Unit := Parent (Current_Unit); - end loop; - - Current_Context := Context_Items (Current_Unit); - - Item := First (Context_Items (Parent (Gen_Decl))); - while Present (Item) loop - if Nkind (Item) = N_With_Clause then - New_I := New_Copy (Item); - Set_Implicit_With (New_I, True); - Append (New_I, Current_Context); - end if; - - Next (Item); - end loop; - end if; - end Inherit_Context; - - ---------------- - -- Initialize -- - ---------------- - - procedure Initialize is - begin - Generic_Renamings.Init; - Instance_Envs.Init; - Generic_Flags.Init; - Generic_Renamings_HTable.Reset; - Circularity_Detected := False; - Exchanged_Views := No_Elist; - Hidden_Entities := No_Elist; - end Initialize; - - ---------------------------- - -- Insert_After_Last_Decl -- - ---------------------------- - - procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id) is - L : List_Id := List_Containing (N); - P : constant Node_Id := Parent (L); - - begin - if not Is_List_Member (F_Node) then - if Nkind (P) = N_Package_Specification - and then L = Visible_Declarations (P) - and then Present (Private_Declarations (P)) - and then not Is_Empty_List (Private_Declarations (P)) - then - L := Private_Declarations (P); - end if; - - Insert_After (Last (L), F_Node); - end if; - end Insert_After_Last_Decl; - - ------------------ - -- Install_Body -- - ------------------ - - procedure Install_Body - (Act_Body : Node_Id; - N : Node_Id; - Gen_Body : Node_Id; - Gen_Decl : Node_Id) - is - Act_Id : constant Entity_Id := Corresponding_Spec (Act_Body); - Act_Unit : constant Node_Id := Unit (Cunit (Get_Source_Unit (N))); - Gen_Id : constant Entity_Id := Corresponding_Spec (Gen_Body); - Par : constant Entity_Id := Scope (Gen_Id); - Gen_Unit : constant Node_Id := - Unit (Cunit (Get_Source_Unit (Gen_Decl))); - Orig_Body : Node_Id := Gen_Body; - F_Node : Node_Id; - Body_Unit : Node_Id; - - Must_Delay : Boolean; - - function Enclosing_Subp (Id : Entity_Id) return Entity_Id; - -- Find subprogram (if any) that encloses instance and/or generic body - - function True_Sloc (N : Node_Id) return Source_Ptr; - -- If the instance is nested inside a generic unit, the Sloc of the - -- instance indicates the place of the original definition, not the - -- point of the current enclosing instance. Pending a better usage of - -- Slocs to indicate instantiation places, we determine the place of - -- origin of a node by finding the maximum sloc of any ancestor node. - -- Why is this not equivalent to Top_Level_Location ??? - - -------------------- - -- Enclosing_Subp -- - -------------------- - - function Enclosing_Subp (Id : Entity_Id) return Entity_Id is - Scop : Entity_Id := Scope (Id); - - begin - while Scop /= Standard_Standard - and then not Is_Overloadable (Scop) - loop - Scop := Scope (Scop); - end loop; - - return Scop; - end Enclosing_Subp; - - --------------- - -- True_Sloc -- - --------------- - - function True_Sloc (N : Node_Id) return Source_Ptr is - Res : Source_Ptr; - N1 : Node_Id; - - begin - Res := Sloc (N); - N1 := N; - while Present (N1) and then N1 /= Act_Unit loop - if Sloc (N1) > Res then - Res := Sloc (N1); - end if; - - N1 := Parent (N1); - end loop; - - return Res; - end True_Sloc; - - -- Start of processing for Install_Body - - begin - -- If the body is a subunit, the freeze point is the corresponding - -- stub in the current compilation, not the subunit itself. - - if Nkind (Parent (Gen_Body)) = N_Subunit then - Orig_Body := Corresponding_Stub (Parent (Gen_Body)); - else - Orig_Body := Gen_Body; - end if; - - Body_Unit := Unit (Cunit (Get_Source_Unit (Orig_Body))); - - -- If the instantiation and the generic definition appear in the - -- same package declaration, this is an early instantiation. - -- If they appear in the same declarative part, it is an early - -- instantiation only if the generic body appears textually later, - -- and the generic body is also in the main unit. - - -- If instance is nested within a subprogram, and the generic body is - -- not, the instance is delayed because the enclosing body is. If - -- instance and body are within the same scope, or the same sub- - -- program body, indicate explicitly that the instance is delayed. - - Must_Delay := - (Gen_Unit = Act_Unit - and then ((Nkind (Gen_Unit) = N_Package_Declaration) - or else Nkind (Gen_Unit) = N_Generic_Package_Declaration - or else (Gen_Unit = Body_Unit - and then True_Sloc (N) < Sloc (Orig_Body))) - and then Is_In_Main_Unit (Gen_Unit) - and then (Scope (Act_Id) = Scope (Gen_Id) - or else - Enclosing_Subp (Act_Id) = Enclosing_Subp (Gen_Id))); - - -- If this is an early instantiation, the freeze node is placed after - -- the generic body. Otherwise, if the generic appears in an instance, - -- we cannot freeze the current instance until the outer one is frozen. - -- This is only relevant if the current instance is nested within some - -- inner scope not itself within the outer instance. If this scope is - -- a package body in the same declarative part as the outer instance, - -- then that body needs to be frozen after the outer instance. Finally, - -- if no delay is needed, we place the freeze node at the end of the - -- current declarative part. - - if Expander_Active then - Ensure_Freeze_Node (Act_Id); - F_Node := Freeze_Node (Act_Id); - - if Must_Delay then - Insert_After (Orig_Body, F_Node); - - elsif Is_Generic_Instance (Par) - and then Present (Freeze_Node (Par)) - and then Scope (Act_Id) /= Par - then - -- Freeze instance of inner generic after instance of enclosing - -- generic. - - if In_Same_Declarative_Part (Freeze_Node (Par), N) then - Insert_After (Freeze_Node (Par), F_Node); - - -- Freeze package enclosing instance of inner generic after - -- instance of enclosing generic. - - elsif Nkind (Parent (N)) = N_Package_Body - and then In_Same_Declarative_Part (Freeze_Node (Par), Parent (N)) - then - - declare - Enclosing : constant Entity_Id := - Corresponding_Spec (Parent (N)); - - begin - Insert_After_Last_Decl (N, F_Node); - Ensure_Freeze_Node (Enclosing); - - if not Is_List_Member (Freeze_Node (Enclosing)) then - Insert_After (Freeze_Node (Par), Freeze_Node (Enclosing)); - end if; - end; - - else - Insert_After_Last_Decl (N, F_Node); - end if; - - else - Insert_After_Last_Decl (N, F_Node); - end if; - end if; - - Set_Is_Frozen (Act_Id); - Insert_Before (N, Act_Body); - Mark_Rewrite_Insertion (Act_Body); - end Install_Body; - - -------------------- - -- Install_Parent -- - -------------------- - - procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False) is - Ancestors : constant Elist_Id := New_Elmt_List; - S : constant Entity_Id := Current_Scope; - Inst_Par : Entity_Id; - First_Par : Entity_Id; - Inst_Node : Node_Id; - Gen_Par : Entity_Id; - First_Gen : Entity_Id; - Elmt : Elmt_Id; - - procedure Install_Formal_Packages (Par : Entity_Id); - -- If any of the formals of the parent are formal packages with box, - -- their formal parts are visible in the parent and thus in the child - -- unit as well. Analogous to what is done in Check_Generic_Actuals - -- for the unit itself. - - procedure Install_Noninstance_Specs (Par : Entity_Id); - -- Install the scopes of noninstance parent units ending with Par - - procedure Install_Spec (Par : Entity_Id); - -- The child unit is within the declarative part of the parent, so - -- the declarations within the parent are immediately visible. - - ----------------------------- - -- Install_Formal_Packages -- - ----------------------------- - - procedure Install_Formal_Packages (Par : Entity_Id) is - E : Entity_Id; - - begin - E := First_Entity (Par); - while Present (E) loop - if Ekind (E) = E_Package - and then Nkind (Parent (E)) = N_Package_Renaming_Declaration - then - -- If this is the renaming for the parent instance, done - - if Renamed_Object (E) = Par then - exit; - - -- The visibility of a formal of an enclosing generic is - -- already correct. - - elsif Denotes_Formal_Package (E) then - null; - - elsif Present (Associated_Formal_Package (E)) - and then Box_Present (Parent (Associated_Formal_Package (E))) - then - Check_Generic_Actuals (Renamed_Object (E), True); - Set_Is_Hidden (E, False); - end if; - end if; - - Next_Entity (E); - end loop; - end Install_Formal_Packages; - - ------------------------------- - -- Install_Noninstance_Specs -- - ------------------------------- - - procedure Install_Noninstance_Specs (Par : Entity_Id) is - begin - if Present (Par) - and then Par /= Standard_Standard - and then not In_Open_Scopes (Par) - then - Install_Noninstance_Specs (Scope (Par)); - Install_Spec (Par); - end if; - end Install_Noninstance_Specs; - - ------------------ - -- Install_Spec -- - ------------------ - - procedure Install_Spec (Par : Entity_Id) is - Spec : constant Node_Id := - Specification (Unit_Declaration_Node (Par)); - - begin - -- If this parent of the child instance is a top-level unit, - -- then record the unit and its visibility for later resetting - -- in Remove_Parent. We exclude units that are generic instances, - -- as we only want to record this information for the ultimate - -- top-level noninstance parent (is that always correct???). - - if Scope (Par) = Standard_Standard - and then not Is_Generic_Instance (Par) - then - Parent_Unit_Visible := Is_Immediately_Visible (Par); - Instance_Parent_Unit := Par; - end if; - - -- Open the parent scope and make it and its declarations visible. - -- If this point is not within a body, then only the visible - -- declarations should be made visible, and installation of the - -- private declarations is deferred until the appropriate point - -- within analysis of the spec being instantiated (see the handling - -- of parent visibility in Analyze_Package_Specification). This is - -- relaxed in the case where the parent unit is Ada.Tags, to avoid - -- private view problems that occur when compiling instantiations of - -- a generic child of that package (Generic_Dispatching_Constructor). - -- If the instance freezes a tagged type, inlinings of operations - -- from Ada.Tags may need the full view of type Tag. If inlining - -- took proper account of establishing visibility of inlined - -- subprograms' parents then it should be possible to remove this - -- special check. ??? - - New_Scope (Par); - Set_Is_Immediately_Visible (Par); - Install_Visible_Declarations (Par); - Set_Use (Visible_Declarations (Spec)); - - if In_Body or else Is_RTU (Par, Ada_Tags) then - Install_Private_Declarations (Par); - Set_Use (Private_Declarations (Spec)); - end if; - end Install_Spec; - - -- Start of processing for Install_Parent - - begin - -- We need to install the parent instance to compile the instantiation - -- of the child, but the child instance must appear in the current - -- scope. Given that we cannot place the parent above the current - -- scope in the scope stack, we duplicate the current scope and unstack - -- both after the instantiation is complete. - - -- If the parent is itself the instantiation of a child unit, we must - -- also stack the instantiation of its parent, and so on. Each such - -- ancestor is the prefix of the name in a prior instantiation. - - -- If this is a nested instance, the parent unit itself resolves to - -- a renaming of the parent instance, whose declaration we need. - - -- Finally, the parent may be a generic (not an instance) when the - -- child unit appears as a formal package. - - Inst_Par := P; - - if Present (Renamed_Entity (Inst_Par)) then - Inst_Par := Renamed_Entity (Inst_Par); - end if; - - First_Par := Inst_Par; - - Gen_Par := - Generic_Parent (Specification (Unit_Declaration_Node (Inst_Par))); - - First_Gen := Gen_Par; - - while Present (Gen_Par) - and then Is_Child_Unit (Gen_Par) - loop - -- Load grandparent instance as well - - Inst_Node := Get_Package_Instantiation_Node (Inst_Par); - - if Nkind (Name (Inst_Node)) = N_Expanded_Name then - Inst_Par := Entity (Prefix (Name (Inst_Node))); - - if Present (Renamed_Entity (Inst_Par)) then - Inst_Par := Renamed_Entity (Inst_Par); - end if; - - Gen_Par := - Generic_Parent - (Specification (Unit_Declaration_Node (Inst_Par))); - - if Present (Gen_Par) then - Prepend_Elmt (Inst_Par, Ancestors); - - else - -- Parent is not the name of an instantiation - - Install_Noninstance_Specs (Inst_Par); - - exit; - end if; - - else - -- Previous error - - exit; - end if; - end loop; - - if Present (First_Gen) then - Append_Elmt (First_Par, Ancestors); - - else - Install_Noninstance_Specs (First_Par); - end if; - - if not Is_Empty_Elmt_List (Ancestors) then - Elmt := First_Elmt (Ancestors); - - while Present (Elmt) loop - Install_Spec (Node (Elmt)); - Install_Formal_Packages (Node (Elmt)); - - Next_Elmt (Elmt); - end loop; - end if; - - if not In_Body then - New_Scope (S); - end if; - end Install_Parent; - - -------------------------------- - -- Instantiate_Formal_Package -- - -------------------------------- - - function Instantiate_Formal_Package - (Formal : Node_Id; - Actual : Node_Id; - Analyzed_Formal : Node_Id) return List_Id - is - Loc : constant Source_Ptr := Sloc (Actual); - Actual_Pack : Entity_Id; - Formal_Pack : Entity_Id; - Gen_Parent : Entity_Id; - Decls : List_Id; - Nod : Node_Id; - Parent_Spec : Node_Id; - - procedure Find_Matching_Actual - (F : Node_Id; - Act : in out Entity_Id); - -- We need to associate each formal entity in the formal package - -- with the corresponding entity in the actual package. The actual - -- package has been analyzed and possibly expanded, and as a result - -- there is no one-to-one correspondence between the two lists (for - -- example, the actual may include subtypes, itypes, and inherited - -- primitive operations, interspersed among the renaming declarations - -- for the actuals) . We retrieve the corresponding actual by name - -- because each actual has the same name as the formal, and they do - -- appear in the same order. - - function Get_Formal_Entity (N : Node_Id) return Entity_Id; - -- Retrieve entity of defining entity of generic formal parameter. - -- Only the declarations of formals need to be considered when - -- linking them to actuals, but the declarative list may include - -- internal entities generated during analysis, and those are ignored. - - procedure Match_Formal_Entity - (Formal_Node : Node_Id; - Formal_Ent : Entity_Id; - Actual_Ent : Entity_Id); - -- Associates the formal entity with the actual. In the case - -- where Formal_Ent is a formal package, this procedure iterates - -- through all of its formals and enters associations betwen the - -- actuals occurring in the formal package's corresponding actual - -- package (given by Actual_Ent) and the formal package's formal - -- parameters. This procedure recurses if any of the parameters is - -- itself a package. - - function Is_Instance_Of - (Act_Spec : Entity_Id; - Gen_Anc : Entity_Id) return Boolean; - -- The actual can be an instantiation of a generic within another - -- instance, in which case there is no direct link from it to the - -- original generic ancestor. In that case, we recognize that the - -- ultimate ancestor is the same by examining names and scopes. - - procedure Map_Entities (Form : Entity_Id; Act : Entity_Id); - -- Within the generic part, entities in the formal package are - -- visible. To validate subsequent type declarations, indicate - -- the correspondence betwen the entities in the analyzed formal, - -- and the entities in the actual package. There are three packages - -- involved in the instantiation of a formal package: the parent - -- generic P1 which appears in the generic declaration, the fake - -- instantiation P2 which appears in the analyzed generic, and whose - -- visible entities may be used in subsequent formals, and the actual - -- P3 in the instance. To validate subsequent formals, me indicate - -- that the entities in P2 are mapped into those of P3. The mapping of - -- entities has to be done recursively for nested packages. - - procedure Process_Nested_Formal (Formal : Entity_Id); - -- If the current formal is declared with a box, its own formals are - -- visible in the instance, as they were in the generic, and their - -- Hidden flag must be reset. If some of these formals are themselves - -- packages declared with a box, the processing must be recursive. - - -------------------------- - -- Find_Matching_Actual -- - -------------------------- - - procedure Find_Matching_Actual - (F : Node_Id; - Act : in out Entity_Id) - is - Formal_Ent : Entity_Id; - - begin - case Nkind (Original_Node (F)) is - when N_Formal_Object_Declaration | - N_Formal_Type_Declaration => - Formal_Ent := Defining_Identifier (F); - - while Chars (Act) /= Chars (Formal_Ent) loop - Next_Entity (Act); - end loop; - - when N_Formal_Subprogram_Declaration | - N_Formal_Package_Declaration | - N_Package_Declaration | - N_Generic_Package_Declaration => - Formal_Ent := Defining_Entity (F); - - while Chars (Act) /= Chars (Formal_Ent) loop - Next_Entity (Act); - end loop; - - when others => - raise Program_Error; - end case; - end Find_Matching_Actual; - - ------------------------- - -- Match_Formal_Entity -- - ------------------------- - - procedure Match_Formal_Entity - (Formal_Node : Node_Id; - Formal_Ent : Entity_Id; - Actual_Ent : Entity_Id) - is - Act_Pkg : Entity_Id; - - begin - Set_Instance_Of (Formal_Ent, Actual_Ent); - - if Ekind (Actual_Ent) = E_Package then - -- Record associations for each parameter - - Act_Pkg := Actual_Ent; - - declare - A_Ent : Entity_Id := First_Entity (Act_Pkg); - F_Ent : Entity_Id; - F_Node : Node_Id; - - Gen_Decl : Node_Id; - Formals : List_Id; - Actual : Entity_Id; - - begin - -- Retrieve the actual given in the formal package declaration - - Actual := Entity (Name (Original_Node (Formal_Node))); - - -- The actual in the formal package declaration may be a - -- renamed generic package, in which case we want to retrieve - -- the original generic in order to traverse its formal part. - - if Present (Renamed_Entity (Actual)) then - Gen_Decl := Unit_Declaration_Node (Renamed_Entity (Actual)); - else - Gen_Decl := Unit_Declaration_Node (Actual); - end if; - - Formals := Generic_Formal_Declarations (Gen_Decl); - - if Present (Formals) then - F_Node := First_Non_Pragma (Formals); - else - F_Node := Empty; - end if; - - while Present (A_Ent) - and then Present (F_Node) - and then A_Ent /= First_Private_Entity (Act_Pkg) - loop - F_Ent := Get_Formal_Entity (F_Node); - - if Present (F_Ent) then - - -- This is a formal of the original package. Record - -- association and recurse. - - Find_Matching_Actual (F_Node, A_Ent); - Match_Formal_Entity (F_Node, F_Ent, A_Ent); - Next_Entity (A_Ent); - end if; - - Next_Non_Pragma (F_Node); - end loop; - end; - end if; - end Match_Formal_Entity; - - ----------------------- - -- Get_Formal_Entity -- - ----------------------- - - function Get_Formal_Entity (N : Node_Id) return Entity_Id is - Kind : constant Node_Kind := Nkind (Original_Node (N)); - begin - case Kind is - when N_Formal_Object_Declaration => - return Defining_Identifier (N); - - when N_Formal_Type_Declaration => - return Defining_Identifier (N); - - when N_Formal_Subprogram_Declaration => - return Defining_Unit_Name (Specification (N)); - - when N_Formal_Package_Declaration => - return Defining_Identifier (Original_Node (N)); - - when N_Generic_Package_Declaration => - return Defining_Identifier (Original_Node (N)); - - -- All other declarations are introduced by semantic analysis - -- and have no match in the actual. - - when others => - return Empty; - end case; - end Get_Formal_Entity; - - -------------------- - -- Is_Instance_Of -- - -------------------- - - function Is_Instance_Of - (Act_Spec : Entity_Id; - Gen_Anc : Entity_Id) return Boolean - is - Gen_Par : constant Entity_Id := Generic_Parent (Act_Spec); - - begin - if No (Gen_Par) then - return False; - - -- Simplest case: the generic parent of the actual is the formal - - elsif Gen_Par = Gen_Anc then - return True; - - elsif Chars (Gen_Par) /= Chars (Gen_Anc) then - return False; - - -- The actual may be obtained through several instantiations. Its - -- scope must itself be an instance of a generic declared in the - -- same scope as the formal. Any other case is detected above. - - elsif not Is_Generic_Instance (Scope (Gen_Par)) then - return False; - - else - return Generic_Parent (Parent (Scope (Gen_Par))) = Scope (Gen_Anc); - end if; - end Is_Instance_Of; - - ------------------ - -- Map_Entities -- - ------------------ - - procedure Map_Entities (Form : Entity_Id; Act : Entity_Id) is - E1 : Entity_Id; - E2 : Entity_Id; - - begin - Set_Instance_Of (Form, Act); - - -- Traverse formal and actual package to map the corresponding - -- entities. We skip over internal entities that may be generated - -- during semantic analysis, and find the matching entities by - -- name, given that they must appear in the same order. - - E1 := First_Entity (Form); - E2 := First_Entity (Act); - while Present (E1) - and then E1 /= First_Private_Entity (Form) - loop - -- Could this test be a single condition??? - -- Seems like it could, and isn't FPE (Form) a constant anyway??? - - if not Is_Internal (E1) - and then Present (Parent (E1)) - and then not Is_Class_Wide_Type (E1) - and then not Is_Internal_Name (Chars (E1)) - then - while Present (E2) - and then Chars (E2) /= Chars (E1) - loop - Next_Entity (E2); - end loop; - - if No (E2) then - exit; - else - Set_Instance_Of (E1, E2); - - if Is_Type (E1) - and then Is_Tagged_Type (E2) - then - Set_Instance_Of - (Class_Wide_Type (E1), Class_Wide_Type (E2)); - end if; - - if Ekind (E1) = E_Package - and then No (Renamed_Object (E1)) - then - Map_Entities (E1, E2); - end if; - end if; - end if; - - Next_Entity (E1); - end loop; - end Map_Entities; - - --------------------------- - -- Process_Nested_Formal -- - --------------------------- - - procedure Process_Nested_Formal (Formal : Entity_Id) is - Ent : Entity_Id; - - begin - if Present (Associated_Formal_Package (Formal)) - and then Box_Present (Parent (Associated_Formal_Package (Formal))) - then - Ent := First_Entity (Formal); - while Present (Ent) loop - Set_Is_Hidden (Ent, False); - Set_Is_Potentially_Use_Visible - (Ent, Is_Potentially_Use_Visible (Formal)); - - if Ekind (Ent) = E_Package then - exit when Renamed_Entity (Ent) = Renamed_Entity (Formal); - Process_Nested_Formal (Ent); - end if; - - Next_Entity (Ent); - end loop; - end if; - end Process_Nested_Formal; - - -- Start of processing for Instantiate_Formal_Package - - begin - Analyze (Actual); - - if not Is_Entity_Name (Actual) - or else Ekind (Entity (Actual)) /= E_Package - then - Error_Msg_N - ("expect package instance to instantiate formal", Actual); - Abandon_Instantiation (Actual); - raise Program_Error; - - else - Actual_Pack := Entity (Actual); - Set_Is_Instantiated (Actual_Pack); - - -- The actual may be a renamed package, or an outer generic - -- formal package whose instantiation is converted into a renaming. - - if Present (Renamed_Object (Actual_Pack)) then - Actual_Pack := Renamed_Object (Actual_Pack); - end if; - - if Nkind (Analyzed_Formal) = N_Formal_Package_Declaration then - Gen_Parent := Get_Instance_Of (Entity (Name (Analyzed_Formal))); - Formal_Pack := Defining_Identifier (Analyzed_Formal); - else - Gen_Parent := - Generic_Parent (Specification (Analyzed_Formal)); - Formal_Pack := - Defining_Unit_Name (Specification (Analyzed_Formal)); - end if; - - if Nkind (Parent (Actual_Pack)) = N_Defining_Program_Unit_Name then - Parent_Spec := Specification (Unit_Declaration_Node (Actual_Pack)); - else - Parent_Spec := Parent (Actual_Pack); - end if; - - if Gen_Parent = Any_Id then - Error_Msg_N - ("previous error in declaration of formal package", Actual); - Abandon_Instantiation (Actual); - - elsif - Is_Instance_Of (Parent_Spec, Get_Instance_Of (Gen_Parent)) - then - null; - - else - Error_Msg_NE - ("actual parameter must be instance of&", Actual, Gen_Parent); - Abandon_Instantiation (Actual); - end if; - - Set_Instance_Of (Defining_Identifier (Formal), Actual_Pack); - Map_Entities (Formal_Pack, Actual_Pack); - - Nod := - Make_Package_Renaming_Declaration (Loc, - Defining_Unit_Name => New_Copy (Defining_Identifier (Formal)), - Name => New_Reference_To (Actual_Pack, Loc)); - - Set_Associated_Formal_Package (Defining_Unit_Name (Nod), - Defining_Identifier (Formal)); - Decls := New_List (Nod); - - -- If the formal F has a box, then the generic declarations are - -- visible in the generic G. In an instance of G, the corresponding - -- entities in the actual for F (which are the actuals for the - -- instantiation of the generic that F denotes) must also be made - -- visible for analysis of the current instance. On exit from the - -- current instance, those entities are made private again. If the - -- actual is currently in use, these entities are also use-visible. - - -- The loop through the actual entities also steps through the - -- formal entities and enters associations from formals to - -- actuals into the renaming map. This is necessary to properly - -- handle checking of actual parameter associations for later - -- formals that depend on actuals declared in the formal package. - - if Box_Present (Formal) then - declare - Gen_Decl : constant Node_Id := - Unit_Declaration_Node (Gen_Parent); - Formals : constant List_Id := - Generic_Formal_Declarations (Gen_Decl); - Actual_Ent : Entity_Id; - Formal_Node : Node_Id; - Formal_Ent : Entity_Id; - - begin - if Present (Formals) then - Formal_Node := First_Non_Pragma (Formals); - else - Formal_Node := Empty; - end if; - - Actual_Ent := First_Entity (Actual_Pack); - - while Present (Actual_Ent) - and then Actual_Ent /= First_Private_Entity (Actual_Pack) - loop - Set_Is_Hidden (Actual_Ent, False); - Set_Is_Potentially_Use_Visible - (Actual_Ent, In_Use (Actual_Pack)); - - if Ekind (Actual_Ent) = E_Package then - Process_Nested_Formal (Actual_Ent); - end if; - - if Present (Formal_Node) then - Formal_Ent := Get_Formal_Entity (Formal_Node); - - if Present (Formal_Ent) then - Find_Matching_Actual (Formal_Node, Actual_Ent); - Match_Formal_Entity - (Formal_Node, Formal_Ent, Actual_Ent); - end if; - - Next_Non_Pragma (Formal_Node); - - else - -- No further formals to match, but the generic - -- part may contain inherited operation that are - -- not hidden in the enclosing instance. - - Next_Entity (Actual_Ent); - end if; - - end loop; - end; - - -- If the formal is not declared with a box, reanalyze it as - -- an instantiation, to verify the matching rules of 12.7. The - -- actual checks are performed after the generic associations - -- been analyzed. - - else - declare - I_Pack : constant Entity_Id := - Make_Defining_Identifier (Sloc (Actual), - Chars => New_Internal_Name ('P')); - - begin - Set_Is_Internal (I_Pack); - - Append_To (Decls, - Make_Package_Instantiation (Sloc (Actual), - Defining_Unit_Name => I_Pack, - Name => New_Occurrence_Of (Gen_Parent, Sloc (Actual)), - Generic_Associations => - Generic_Associations (Formal))); - end; - end if; - - return Decls; - end if; - end Instantiate_Formal_Package; - - ----------------------------------- - -- Instantiate_Formal_Subprogram -- - ----------------------------------- - - function Instantiate_Formal_Subprogram - (Formal : Node_Id; - Actual : Node_Id; - Analyzed_Formal : Node_Id) return Node_Id - is - Loc : Source_Ptr := Sloc (Instantiation_Node); - Formal_Sub : constant Entity_Id := - Defining_Unit_Name (Specification (Formal)); - Analyzed_S : constant Entity_Id := - Defining_Unit_Name (Specification (Analyzed_Formal)); - Decl_Node : Node_Id; - Nam : Node_Id; - New_Spec : Node_Id; - - function From_Parent_Scope (Subp : Entity_Id) return Boolean; - -- If the generic is a child unit, the parent has been installed on the - -- scope stack, but a default subprogram cannot resolve to something on - -- the parent because that parent is not really part of the visible - -- context (it is there to resolve explicit local entities). If the - -- default has resolved in this way, we remove the entity from - -- immediate visibility and analyze the node again to emit an error - -- message or find another visible candidate. - - procedure Valid_Actual_Subprogram (Act : Node_Id); - -- Perform legality check and raise exception on failure - - ----------------------- - -- From_Parent_Scope -- - ----------------------- - - function From_Parent_Scope (Subp : Entity_Id) return Boolean is - Gen_Scope : Node_Id := Scope (Analyzed_S); - - begin - while Present (Gen_Scope) - and then Is_Child_Unit (Gen_Scope) - loop - if Scope (Subp) = Scope (Gen_Scope) then - return True; - end if; - - Gen_Scope := Scope (Gen_Scope); - end loop; - - return False; - end From_Parent_Scope; - - ----------------------------- - -- Valid_Actual_Subprogram -- - ----------------------------- - - procedure Valid_Actual_Subprogram (Act : Node_Id) is - Act_E : Entity_Id := Empty; - - begin - if Is_Entity_Name (Act) then - Act_E := Entity (Act); - elsif Nkind (Act) = N_Selected_Component - and then Is_Entity_Name (Selector_Name (Act)) - then - Act_E := Entity (Selector_Name (Act)); - end if; - - if (Present (Act_E) and then Is_Overloadable (Act_E)) - or else Nkind (Act) = N_Attribute_Reference - or else Nkind (Act) = N_Indexed_Component - or else Nkind (Act) = N_Character_Literal - or else Nkind (Act) = N_Explicit_Dereference - then - return; - end if; - - Error_Msg_NE - ("expect subprogram or entry name in instantiation of&", - Instantiation_Node, Formal_Sub); - Abandon_Instantiation (Instantiation_Node); - - end Valid_Actual_Subprogram; - - -- Start of processing for Instantiate_Formal_Subprogram - - begin - New_Spec := New_Copy_Tree (Specification (Formal)); - - -- Create new entity for the actual (New_Copy_Tree does not) - - Set_Defining_Unit_Name - (New_Spec, Make_Defining_Identifier (Loc, Chars (Formal_Sub))); - - -- Find entity of actual. If the actual is an attribute reference, it - -- cannot be resolved here (its formal is missing) but is handled - -- instead in Attribute_Renaming. If the actual is overloaded, it is - -- fully resolved subsequently, when the renaming declaration for the - -- formal is analyzed. If it is an explicit dereference, resolve the - -- prefix but not the actual itself, to prevent interpretation as a - -- call. - - if Present (Actual) then - Loc := Sloc (Actual); - Set_Sloc (New_Spec, Loc); - - if Nkind (Actual) = N_Operator_Symbol then - Find_Direct_Name (Actual); - - elsif Nkind (Actual) = N_Explicit_Dereference then - Analyze (Prefix (Actual)); - - elsif Nkind (Actual) /= N_Attribute_Reference then - Analyze (Actual); - end if; - - Valid_Actual_Subprogram (Actual); - Nam := Actual; - - elsif Present (Default_Name (Formal)) then - if Nkind (Default_Name (Formal)) /= N_Attribute_Reference - and then Nkind (Default_Name (Formal)) /= N_Selected_Component - and then Nkind (Default_Name (Formal)) /= N_Indexed_Component - and then Nkind (Default_Name (Formal)) /= N_Character_Literal - and then Present (Entity (Default_Name (Formal))) - then - Nam := New_Occurrence_Of (Entity (Default_Name (Formal)), Loc); - else - Nam := New_Copy (Default_Name (Formal)); - Set_Sloc (Nam, Loc); - end if; - - elsif Box_Present (Formal) then - - -- Actual is resolved at the point of instantiation. Create - -- an identifier or operator with the same name as the formal. - - if Nkind (Formal_Sub) = N_Defining_Operator_Symbol then - Nam := Make_Operator_Symbol (Loc, - Chars => Chars (Formal_Sub), - Strval => No_String); - else - Nam := Make_Identifier (Loc, Chars (Formal_Sub)); - end if; - - elsif Nkind (Specification (Formal)) = N_Procedure_Specification - and then Null_Present (Specification (Formal)) - then - -- Generate null body for procedure, for use in the instance - - Decl_Node := - Make_Subprogram_Body (Loc, - Specification => New_Spec, - Declarations => New_List, - Handled_Statement_Sequence => - Make_Handled_Sequence_Of_Statements (Loc, - Statements => New_List (Make_Null_Statement (Loc)))); - - Set_Is_Intrinsic_Subprogram (Defining_Unit_Name (New_Spec)); - return Decl_Node; - - else - Error_Msg_Sloc := Sloc (Scope (Analyzed_S)); - Error_Msg_NE - ("missing actual&", Instantiation_Node, Formal_Sub); - Error_Msg_NE - ("\in instantiation of & declared#", - Instantiation_Node, Scope (Analyzed_S)); - Abandon_Instantiation (Instantiation_Node); - end if; - - Decl_Node := - Make_Subprogram_Renaming_Declaration (Loc, - Specification => New_Spec, - Name => Nam); - - -- If we do not have an actual and the formal specified <> then - -- set to get proper default. - - if No (Actual) and then Box_Present (Formal) then - Set_From_Default (Decl_Node); - end if; - - -- Gather possible interpretations for the actual before analyzing the - -- instance. If overloaded, it will be resolved when analyzing the - -- renaming declaration. - - if Box_Present (Formal) - and then No (Actual) - then - Analyze (Nam); - - if Is_Child_Unit (Scope (Analyzed_S)) - and then Present (Entity (Nam)) - then - if not Is_Overloaded (Nam) then - - if From_Parent_Scope (Entity (Nam)) then - Set_Is_Immediately_Visible (Entity (Nam), False); - Set_Entity (Nam, Empty); - Set_Etype (Nam, Empty); - - Analyze (Nam); - - Set_Is_Immediately_Visible (Entity (Nam)); - end if; - - else - declare - I : Interp_Index; - It : Interp; - - begin - Get_First_Interp (Nam, I, It); - - while Present (It.Nam) loop - if From_Parent_Scope (It.Nam) then - Remove_Interp (I); - end if; - - Get_Next_Interp (I, It); - end loop; - end; - end if; - end if; - end if; - - -- The generic instantiation freezes the actual. This can only be - -- done once the actual is resolved, in the analysis of the renaming - -- declaration. To make the formal subprogram entity available, we set - -- Corresponding_Formal_Spec to point to the formal subprogram entity. - -- This is also needed in Analyze_Subprogram_Renaming for the processing - -- of formal abstract subprograms. - - Set_Corresponding_Formal_Spec (Decl_Node, Analyzed_S); - - -- We cannot analyze the renaming declaration, and thus find the - -- actual, until the all the actuals are assembled in the instance. - -- For subsequent checks of other actuals, indicate the node that - -- will hold the instance of this formal. - - Set_Instance_Of (Analyzed_S, Nam); - - if Nkind (Actual) = N_Selected_Component - and then Is_Task_Type (Etype (Prefix (Actual))) - and then not Is_Frozen (Etype (Prefix (Actual))) - then - -- The renaming declaration will create a body, which must appear - -- outside of the instantiation, We move the renaming declaration - -- out of the instance, and create an additional renaming inside, - -- to prevent freezing anomalies. - - declare - Anon_Id : constant Entity_Id := - Make_Defining_Identifier - (Loc, New_Internal_Name ('E')); - begin - Set_Defining_Unit_Name (New_Spec, Anon_Id); - Insert_Before (Instantiation_Node, Decl_Node); - Analyze (Decl_Node); - - -- Now create renaming within the instance - - Decl_Node := - Make_Subprogram_Renaming_Declaration (Loc, - Specification => New_Copy_Tree (New_Spec), - Name => New_Occurrence_Of (Anon_Id, Loc)); - - Set_Defining_Unit_Name (Specification (Decl_Node), - Make_Defining_Identifier (Loc, Chars (Formal_Sub))); - end; - end if; - - return Decl_Node; - end Instantiate_Formal_Subprogram; - - ------------------------ - -- Instantiate_Object -- - ------------------------ - - function Instantiate_Object - (Formal : Node_Id; - Actual : Node_Id; - Analyzed_Formal : Node_Id) return List_Id - is - Formal_Id : constant Entity_Id := Defining_Identifier (Formal); - Type_Id : constant Node_Id := Subtype_Mark (Formal); - Loc : constant Source_Ptr := Sloc (Actual); - Act_Assoc : constant Node_Id := Parent (Actual); - Orig_Ftyp : constant Entity_Id := - Etype (Defining_Identifier (Analyzed_Formal)); - List : constant List_Id := New_List; - Ftyp : Entity_Id; - Decl_Node : Node_Id; - Subt_Decl : Node_Id := Empty; - - begin - -- Sloc for error message on missing actual - - Error_Msg_Sloc := Sloc (Scope (Defining_Identifier (Analyzed_Formal))); - - if Get_Instance_Of (Formal_Id) /= Formal_Id then - Error_Msg_N ("duplicate instantiation of generic parameter", Actual); - end if; - - Set_Parent (List, Parent (Actual)); - - -- OUT present - - if Out_Present (Formal) then - - -- An IN OUT generic actual must be a name. The instantiation is a - -- renaming declaration. The actual is the name being renamed. We - -- use the actual directly, rather than a copy, because it is not - -- used further in the list of actuals, and because a copy or a use - -- of relocate_node is incorrect if the instance is nested within a - -- generic. In order to simplify ASIS searches, the Generic_Parent - -- field links the declaration to the generic association. - - if No (Actual) then - Error_Msg_NE - ("missing actual&", - Instantiation_Node, Formal_Id); - Error_Msg_NE - ("\in instantiation of & declared#", - Instantiation_Node, - Scope (Defining_Identifier (Analyzed_Formal))); - Abandon_Instantiation (Instantiation_Node); - end if; - - Decl_Node := - Make_Object_Renaming_Declaration (Loc, - Defining_Identifier => New_Copy (Formal_Id), - Subtype_Mark => New_Copy_Tree (Type_Id), - Name => Actual); - - Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc); - - -- The analysis of the actual may produce insert_action nodes, so - -- the declaration must have a context in which to attach them. - - Append (Decl_Node, List); - Analyze (Actual); - - -- Return if the analysis of the actual reported some error - - if Etype (Actual) = Any_Type then - return List; - end if; - - -- This check is performed here because Analyze_Object_Renaming - -- will not check it when Comes_From_Source is False. Note - -- though that the check for the actual being the name of an - -- object will be performed in Analyze_Object_Renaming. - - if Is_Object_Reference (Actual) - and then Is_Dependent_Component_Of_Mutable_Object (Actual) - then - Error_Msg_N - ("illegal discriminant-dependent component for in out parameter", - Actual); - end if; - - -- The actual has to be resolved in order to check that it is - -- a variable (due to cases such as F(1), where F returns - -- access to an array, and for overloaded prefixes). - - Ftyp := - Get_Instance_Of (Etype (Defining_Identifier (Analyzed_Formal))); - - if Is_Private_Type (Ftyp) - and then not Is_Private_Type (Etype (Actual)) - and then (Base_Type (Full_View (Ftyp)) = Base_Type (Etype (Actual)) - or else Base_Type (Etype (Actual)) = Ftyp) - then - -- If the actual has the type of the full view of the formal, - -- or else a non-private subtype of the formal, then - -- the visibility of the formal type has changed. Add to the - -- actuals a subtype declaration that will force the exchange - -- of views in the body of the instance as well. - - Subt_Decl := - Make_Subtype_Declaration (Loc, - Defining_Identifier => - Make_Defining_Identifier (Loc, New_Internal_Name ('P')), - Subtype_Indication => New_Occurrence_Of (Ftyp, Loc)); - - Prepend (Subt_Decl, List); - - Prepend_Elmt (Full_View (Ftyp), Exchanged_Views); - Exchange_Declarations (Ftyp); - end if; - - Resolve (Actual, Ftyp); - - if not Is_Variable (Actual) or else Paren_Count (Actual) > 0 then - Error_Msg_NE - ("actual for& must be a variable", Actual, Formal_Id); - - elsif Base_Type (Ftyp) /= Base_Type (Etype (Actual)) then - Error_Msg_NE ( - "type of actual does not match type of&", Actual, Formal_Id); - - end if; - - Note_Possible_Modification (Actual); - - -- Check for instantiation of atomic/volatile actual for - -- non-atomic/volatile formal (RM C.6 (12)). - - if Is_Atomic_Object (Actual) - and then not Is_Atomic (Orig_Ftyp) - then - Error_Msg_N - ("cannot instantiate non-atomic formal object " & - "with atomic actual", Actual); - - elsif Is_Volatile_Object (Actual) - and then not Is_Volatile (Orig_Ftyp) - then - Error_Msg_N - ("cannot instantiate non-volatile formal object " & - "with volatile actual", Actual); - end if; - - -- OUT not present - - else - -- The instantiation of a generic formal in-parameter - -- is a constant declaration. The actual is the expression for - -- that declaration. - - if Present (Actual) then - - Decl_Node := Make_Object_Declaration (Loc, - Defining_Identifier => New_Copy (Formal_Id), - Constant_Present => True, - Object_Definition => New_Copy_Tree (Type_Id), - Expression => Actual); - - Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc); - - -- A generic formal object of a tagged type is defined - -- to be aliased so the new constant must also be treated - -- as aliased. - - if Is_Tagged_Type - (Etype (Defining_Identifier (Analyzed_Formal))) - then - Set_Aliased_Present (Decl_Node); - end if; - - Append (Decl_Node, List); - - -- No need to repeat (pre-)analysis of some expression nodes - -- already handled in Pre_Analyze_Actuals. - - if Nkind (Actual) /= N_Allocator then - Analyze (Actual); - - -- Return if the analysis of the actual reported some error - - if Etype (Actual) = Any_Type then - return List; - end if; - end if; - - declare - Typ : constant Entity_Id := - Get_Instance_Of - (Etype (Defining_Identifier (Analyzed_Formal))); - - begin - Freeze_Before (Instantiation_Node, Typ); - - -- If the actual is an aggregate, perform name resolution on - -- its components (the analysis of an aggregate does not do - -- it) to capture local names that may be hidden if the - -- generic is a child unit. - - if Nkind (Actual) = N_Aggregate then - Pre_Analyze_And_Resolve (Actual, Typ); - end if; - end; - - elsif Present (Expression (Formal)) then - - -- Use default to construct declaration - - Decl_Node := - Make_Object_Declaration (Sloc (Formal), - Defining_Identifier => New_Copy (Formal_Id), - Constant_Present => True, - Object_Definition => New_Copy (Type_Id), - Expression => New_Copy_Tree (Expression (Formal))); - - Append (Decl_Node, List); - Set_Analyzed (Expression (Decl_Node), False); - - else - Error_Msg_NE - ("missing actual&", - Instantiation_Node, Formal_Id); - Error_Msg_NE ("\in instantiation of & declared#", - Instantiation_Node, - Scope (Defining_Identifier (Analyzed_Formal))); - - if Is_Scalar_Type - (Etype (Defining_Identifier (Analyzed_Formal))) - then - -- Create dummy constant declaration so that instance can - -- be analyzed, to minimize cascaded visibility errors. - - Decl_Node := - Make_Object_Declaration (Loc, - Defining_Identifier => New_Copy (Formal_Id), - Constant_Present => True, - Object_Definition => New_Copy (Type_Id), - Expression => - Make_Attribute_Reference (Sloc (Formal_Id), - Attribute_Name => Name_First, - Prefix => New_Copy (Type_Id))); - - Append (Decl_Node, List); - - else - Abandon_Instantiation (Instantiation_Node); - end if; - end if; - - end if; - - return List; - end Instantiate_Object; - - ------------------------------ - -- Instantiate_Package_Body -- - ------------------------------ - - procedure Instantiate_Package_Body - (Body_Info : Pending_Body_Info; - Inlined_Body : Boolean := False) - is - Act_Decl : constant Node_Id := Body_Info.Act_Decl; - Inst_Node : constant Node_Id := Body_Info.Inst_Node; - Loc : constant Source_Ptr := Sloc (Inst_Node); - - Gen_Id : constant Node_Id := Name (Inst_Node); - Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node); - Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit); - Act_Spec : constant Node_Id := Specification (Act_Decl); - Act_Decl_Id : constant Entity_Id := Defining_Entity (Act_Spec); - - Act_Body_Name : Node_Id; - Gen_Body : Node_Id; - Gen_Body_Id : Node_Id; - Act_Body : Node_Id; - Act_Body_Id : Entity_Id; - - Parent_Installed : Boolean := False; - Save_Style_Check : constant Boolean := Style_Check; - - begin - Gen_Body_Id := Corresponding_Body (Gen_Decl); - - -- The instance body may already have been processed, as the parent - -- of another instance that is inlined. (Load_Parent_Of_Generic). - - if Present (Corresponding_Body (Instance_Spec (Inst_Node))) then - return; - end if; - - Expander_Mode_Save_And_Set (Body_Info.Expander_Status); - - if No (Gen_Body_Id) then - Load_Parent_Of_Generic (Inst_Node, Specification (Gen_Decl)); - Gen_Body_Id := Corresponding_Body (Gen_Decl); - end if; - - -- Establish global variable for sloc adjustment and for error - -- recovery. - - Instantiation_Node := Inst_Node; - - if Present (Gen_Body_Id) then - Save_Env (Gen_Unit, Act_Decl_Id); - Style_Check := False; - Current_Sem_Unit := Body_Info.Current_Sem_Unit; - - Gen_Body := Unit_Declaration_Node (Gen_Body_Id); - - Create_Instantiation_Source - (Inst_Node, Gen_Body_Id, False, S_Adjustment); - - Act_Body := - Copy_Generic_Node - (Original_Node (Gen_Body), Empty, Instantiating => True); - - -- Build new name (possibly qualified) for body declaration - - Act_Body_Id := New_Copy (Act_Decl_Id); - - -- Some attributes of the spec entity are not inherited by the - -- body entity. - - Set_Handler_Records (Act_Body_Id, No_List); - - if Nkind (Defining_Unit_Name (Act_Spec)) = - N_Defining_Program_Unit_Name - then - Act_Body_Name := - Make_Defining_Program_Unit_Name (Loc, - Name => New_Copy_Tree (Name (Defining_Unit_Name (Act_Spec))), - Defining_Identifier => Act_Body_Id); - else - Act_Body_Name := Act_Body_Id; - end if; - - Set_Defining_Unit_Name (Act_Body, Act_Body_Name); - - Set_Corresponding_Spec (Act_Body, Act_Decl_Id); - Check_Generic_Actuals (Act_Decl_Id, False); - - -- If it is a child unit, make the parent instance (which is an - -- instance of the parent of the generic) visible. The parent - -- instance is the prefix of the name of the generic unit. - - if Ekind (Scope (Gen_Unit)) = E_Generic_Package - and then Nkind (Gen_Id) = N_Expanded_Name - then - Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True); - Parent_Installed := True; - - elsif Is_Child_Unit (Gen_Unit) then - Install_Parent (Scope (Gen_Unit), In_Body => True); - Parent_Installed := True; - end if; - - -- If the instantiation is a library unit, and this is the main - -- unit, then build the resulting compilation unit nodes for the - -- instance. If this is a compilation unit but it is not the main - -- unit, then it is the body of a unit in the context, that is being - -- compiled because it is encloses some inlined unit or another - -- generic unit being instantiated. In that case, this body is not - -- part of the current compilation, and is not attached to the tree, - -- but its parent must be set for analysis. - - if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then - - -- Replace instance node with body of instance, and create - -- new node for corresponding instance declaration. - - Build_Instance_Compilation_Unit_Nodes - (Inst_Node, Act_Body, Act_Decl); - Analyze (Inst_Node); - - if Parent (Inst_Node) = Cunit (Main_Unit) then - - -- If the instance is a child unit itself, then set the - -- scope of the expanded body to be the parent of the - -- instantiation (ensuring that the fully qualified name - -- will be generated for the elaboration subprogram). - - if Nkind (Defining_Unit_Name (Act_Spec)) = - N_Defining_Program_Unit_Name - then - Set_Scope - (Defining_Entity (Inst_Node), Scope (Act_Decl_Id)); - end if; - end if; - - -- Case where instantiation is not a library unit - - else - -- If this is an early instantiation, i.e. appears textually - -- before the corresponding body and must be elaborated first, - -- indicate that the body instance is to be delayed. - - Install_Body (Act_Body, Inst_Node, Gen_Body, Gen_Decl); - - -- Now analyze the body. We turn off all checks if this is - -- an internal unit, since there is no reason to have checks - -- on for any predefined run-time library code. All such - -- code is designed to be compiled with checks off. - - -- Note that we do NOT apply this criterion to children of - -- GNAT (or on VMS, children of DEC). The latter units must - -- suppress checks explicitly if this is needed. - - if Is_Predefined_File_Name - (Unit_File_Name (Get_Source_Unit (Gen_Decl))) - then - Analyze (Act_Body, Suppress => All_Checks); - else - Analyze (Act_Body); - end if; - end if; - - if not Generic_Separately_Compiled (Gen_Unit) then - Inherit_Context (Gen_Body, Inst_Node); - end if; - - -- Remove the parent instances if they have been placed on the - -- scope stack to compile the body. - - if Parent_Installed then - Remove_Parent (In_Body => True); - end if; - - Restore_Private_Views (Act_Decl_Id); - - -- Remove the current unit from visibility if this is an instance - -- that is not elaborated on the fly for inlining purposes. - - if not Inlined_Body then - Set_Is_Immediately_Visible (Act_Decl_Id, False); - end if; - - Restore_Env; - Style_Check := Save_Style_Check; - - -- If we have no body, and the unit requires a body, then complain. - -- This complaint is suppressed if we have detected other errors - -- (since a common reason for missing the body is that it had errors). - - elsif Unit_Requires_Body (Gen_Unit) then - if Serious_Errors_Detected = 0 then - Error_Msg_NE - ("cannot find body of generic package &", Inst_Node, Gen_Unit); - - -- Don't attempt to perform any cleanup actions if some other - -- error was aready detected, since this can cause blowups. - - else - return; - end if; - - -- Case of package that does not need a body - - else - -- If the instantiation of the declaration is a library unit, - -- rewrite the original package instantiation as a package - -- declaration in the compilation unit node. - - if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then - Set_Parent_Spec (Act_Decl, Parent_Spec (Inst_Node)); - Rewrite (Inst_Node, Act_Decl); - - -- Generate elaboration entity, in case spec has elaboration - -- code. This cannot be done when the instance is analyzed, - -- because it is not known yet whether the body exists. - - Set_Elaboration_Entity_Required (Act_Decl_Id, False); - Build_Elaboration_Entity (Parent (Inst_Node), Act_Decl_Id); - - -- If the instantiation is not a library unit, then append the - -- declaration to the list of implicitly generated entities. - -- unless it is already a list member which means that it was - -- already processed - - elsif not Is_List_Member (Act_Decl) then - Mark_Rewrite_Insertion (Act_Decl); - Insert_Before (Inst_Node, Act_Decl); - end if; - end if; - - Expander_Mode_Restore; - end Instantiate_Package_Body; - - --------------------------------- - -- Instantiate_Subprogram_Body -- - --------------------------------- - - procedure Instantiate_Subprogram_Body - (Body_Info : Pending_Body_Info) - is - Act_Decl : constant Node_Id := Body_Info.Act_Decl; - Inst_Node : constant Node_Id := Body_Info.Inst_Node; - Loc : constant Source_Ptr := Sloc (Inst_Node); - Gen_Id : constant Node_Id := Name (Inst_Node); - Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node); - Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit); - Anon_Id : constant Entity_Id := - Defining_Unit_Name (Specification (Act_Decl)); - Pack_Id : constant Entity_Id := - Defining_Unit_Name (Parent (Act_Decl)); - Decls : List_Id; - Gen_Body : Node_Id; - Gen_Body_Id : Node_Id; - Act_Body : Node_Id; - Act_Body_Id : Entity_Id; - Pack_Body : Node_Id; - Prev_Formal : Entity_Id; - Ret_Expr : Node_Id; - Unit_Renaming : Node_Id; - - Parent_Installed : Boolean := False; - Save_Style_Check : constant Boolean := Style_Check; - - begin - Gen_Body_Id := Corresponding_Body (Gen_Decl); - - Expander_Mode_Save_And_Set (Body_Info.Expander_Status); - - if No (Gen_Body_Id) then - Load_Parent_Of_Generic (Inst_Node, Specification (Gen_Decl)); - Gen_Body_Id := Corresponding_Body (Gen_Decl); - end if; - - Instantiation_Node := Inst_Node; - - if Present (Gen_Body_Id) then - Gen_Body := Unit_Declaration_Node (Gen_Body_Id); - - if Nkind (Gen_Body) = N_Subprogram_Body_Stub then - - -- Either body is not present, or context is non-expanding, as - -- when compiling a subunit. Mark the instance as completed, and - -- diagnose a missing body when needed. - - if Expander_Active - and then Operating_Mode = Generate_Code - then - Error_Msg_N - ("missing proper body for instantiation", Gen_Body); - end if; - - Set_Has_Completion (Anon_Id); - return; - end if; - - Save_Env (Gen_Unit, Anon_Id); - Style_Check := False; - Current_Sem_Unit := Body_Info.Current_Sem_Unit; - Create_Instantiation_Source - (Inst_Node, - Gen_Body_Id, - False, - S_Adjustment); - - Act_Body := - Copy_Generic_Node - (Original_Node (Gen_Body), Empty, Instantiating => True); - Act_Body_Id := Defining_Entity (Act_Body); - Set_Chars (Act_Body_Id, Chars (Anon_Id)); - Set_Sloc (Act_Body_Id, Sloc (Defining_Entity (Inst_Node))); - Set_Corresponding_Spec (Act_Body, Anon_Id); - Set_Has_Completion (Anon_Id); - Check_Generic_Actuals (Pack_Id, False); - - -- If it is a child unit, make the parent instance (which is an - -- instance of the parent of the generic) visible. The parent - -- instance is the prefix of the name of the generic unit. - - if Ekind (Scope (Gen_Unit)) = E_Generic_Package - and then Nkind (Gen_Id) = N_Expanded_Name - then - Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True); - Parent_Installed := True; - - elsif Is_Child_Unit (Gen_Unit) then - Install_Parent (Scope (Gen_Unit), In_Body => True); - Parent_Installed := True; - end if; - - -- Inside its body, a reference to the generic unit is a reference - -- to the instance. The corresponding renaming is the first - -- declaration in the body. - - Unit_Renaming := - Make_Subprogram_Renaming_Declaration (Loc, - Specification => - Copy_Generic_Node ( - Specification (Original_Node (Gen_Body)), - Empty, - Instantiating => True), - Name => New_Occurrence_Of (Anon_Id, Loc)); - - -- If there is a formal subprogram with the same name as the - -- unit itself, do not add this renaming declaration. This is - -- a temporary fix for one ACVC test. ??? - - Prev_Formal := First_Entity (Pack_Id); - while Present (Prev_Formal) loop - if Chars (Prev_Formal) = Chars (Gen_Unit) - and then Is_Overloadable (Prev_Formal) - then - exit; - end if; - - Next_Entity (Prev_Formal); - end loop; - - if Present (Prev_Formal) then - Decls := New_List (Act_Body); - else - Decls := New_List (Unit_Renaming, Act_Body); - end if; - - -- The subprogram body is placed in the body of a dummy package - -- body, whose spec contains the subprogram declaration as well - -- as the renaming declarations for the generic parameters. - - Pack_Body := Make_Package_Body (Loc, - Defining_Unit_Name => New_Copy (Pack_Id), - Declarations => Decls); - - Set_Corresponding_Spec (Pack_Body, Pack_Id); - - -- If the instantiation is a library unit, then build resulting - -- compilation unit nodes for the instance. The declaration of - -- the enclosing package is the grandparent of the subprogram - -- declaration. First replace the instantiation node as the unit - -- of the corresponding compilation. - - if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then - if Parent (Inst_Node) = Cunit (Main_Unit) then - Set_Unit (Parent (Inst_Node), Inst_Node); - Build_Instance_Compilation_Unit_Nodes - (Inst_Node, Pack_Body, Parent (Parent (Act_Decl))); - Analyze (Inst_Node); - else - Set_Parent (Pack_Body, Parent (Inst_Node)); - Analyze (Pack_Body); - end if; - - else - Insert_Before (Inst_Node, Pack_Body); - Mark_Rewrite_Insertion (Pack_Body); - Analyze (Pack_Body); - - if Expander_Active then - Freeze_Subprogram_Body (Inst_Node, Gen_Body, Pack_Id); - end if; - end if; - - if not Generic_Separately_Compiled (Gen_Unit) then - Inherit_Context (Gen_Body, Inst_Node); - end if; - - Restore_Private_Views (Pack_Id, False); - - if Parent_Installed then - Remove_Parent (In_Body => True); - end if; - - Restore_Env; - Style_Check := Save_Style_Check; - - -- Body not found. Error was emitted already. If there were no - -- previous errors, this may be an instance whose scope is a premature - -- instance. In that case we must insure that the (legal) program does - -- raise program error if executed. We generate a subprogram body for - -- this purpose. See DEC ac30vso. - - elsif Serious_Errors_Detected = 0 - and then Nkind (Parent (Inst_Node)) /= N_Compilation_Unit - then - if Ekind (Anon_Id) = E_Procedure then - Act_Body := - Make_Subprogram_Body (Loc, - Specification => - Make_Procedure_Specification (Loc, - Defining_Unit_Name => - Make_Defining_Identifier (Loc, Chars (Anon_Id)), - Parameter_Specifications => - New_Copy_List - (Parameter_Specifications (Parent (Anon_Id)))), - - Declarations => Empty_List, - Handled_Statement_Sequence => - Make_Handled_Sequence_Of_Statements (Loc, - Statements => - New_List ( - Make_Raise_Program_Error (Loc, - Reason => - PE_Access_Before_Elaboration)))); - - else - Ret_Expr := - Make_Raise_Program_Error (Loc, - Reason => PE_Access_Before_Elaboration); - - Set_Etype (Ret_Expr, (Etype (Anon_Id))); - Set_Analyzed (Ret_Expr); - - Act_Body := - Make_Subprogram_Body (Loc, - Specification => - Make_Function_Specification (Loc, - Defining_Unit_Name => - Make_Defining_Identifier (Loc, Chars (Anon_Id)), - Parameter_Specifications => - New_Copy_List - (Parameter_Specifications (Parent (Anon_Id))), - Result_Definition => - New_Occurrence_Of (Etype (Anon_Id), Loc)), - - Declarations => Empty_List, - Handled_Statement_Sequence => - Make_Handled_Sequence_Of_Statements (Loc, - Statements => - New_List (Make_Return_Statement (Loc, Ret_Expr)))); - end if; - - Pack_Body := Make_Package_Body (Loc, - Defining_Unit_Name => New_Copy (Pack_Id), - Declarations => New_List (Act_Body)); - - Insert_After (Inst_Node, Pack_Body); - Set_Corresponding_Spec (Pack_Body, Pack_Id); - Analyze (Pack_Body); - end if; - - Expander_Mode_Restore; - end Instantiate_Subprogram_Body; - - ---------------------- - -- Instantiate_Type -- - ---------------------- - - function Instantiate_Type - (Formal : Node_Id; - Actual : Node_Id; - Analyzed_Formal : Node_Id; - Actual_Decls : List_Id) return Node_Id - is - Loc : constant Source_Ptr := Sloc (Actual); - Gen_T : constant Entity_Id := Defining_Identifier (Formal); - A_Gen_T : constant Entity_Id := Defining_Identifier (Analyzed_Formal); - Ancestor : Entity_Id := Empty; - Def : constant Node_Id := Formal_Type_Definition (Formal); - Act_T : Entity_Id; - Decl_Node : Node_Id; - - procedure Validate_Array_Type_Instance; - procedure Validate_Access_Subprogram_Instance; - procedure Validate_Access_Type_Instance; - procedure Validate_Derived_Type_Instance; - procedure Validate_Derived_Interface_Type_Instance; - procedure Validate_Interface_Type_Instance; - procedure Validate_Private_Type_Instance; - -- These procedures perform validation tests for the named case - - function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean; - -- Check that base types are the same and that the subtypes match - -- statically. Used in several of the above. - - -------------------- - -- Subtypes_Match -- - -------------------- - - function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean is - T : constant Entity_Id := Get_Instance_Of (Gen_T); - - begin - return (Base_Type (T) = Base_Type (Act_T) - and then Subtypes_Statically_Match (T, Act_T)) - - or else (Is_Class_Wide_Type (Gen_T) - and then Is_Class_Wide_Type (Act_T) - and then - Subtypes_Match - (Get_Instance_Of (Root_Type (Gen_T)), - Root_Type (Act_T))) - - or else - ((Ekind (Gen_T) = E_Anonymous_Access_Subprogram_Type - or else Ekind (Gen_T) = E_Anonymous_Access_Type) - and then Ekind (Act_T) = Ekind (Gen_T) - and then - Subtypes_Statically_Match - (Designated_Type (Gen_T), Designated_Type (Act_T))); - end Subtypes_Match; - - ----------------------------------------- - -- Validate_Access_Subprogram_Instance -- - ----------------------------------------- - - procedure Validate_Access_Subprogram_Instance is - begin - if not Is_Access_Type (Act_T) - or else Ekind (Designated_Type (Act_T)) /= E_Subprogram_Type - then - Error_Msg_NE - ("expect access type in instantiation of &", Actual, Gen_T); - Abandon_Instantiation (Actual); - end if; - - Check_Mode_Conformant - (Designated_Type (Act_T), - Designated_Type (A_Gen_T), - Actual, - Get_Inst => True); - - if Ekind (Base_Type (Act_T)) = E_Access_Protected_Subprogram_Type then - if Ekind (A_Gen_T) = E_Access_Subprogram_Type then - Error_Msg_NE - ("protected access type not allowed for formal &", - Actual, Gen_T); - end if; - - elsif Ekind (A_Gen_T) = E_Access_Protected_Subprogram_Type then - Error_Msg_NE - ("expect protected access type for formal &", - Actual, Gen_T); - end if; - end Validate_Access_Subprogram_Instance; - - ----------------------------------- - -- Validate_Access_Type_Instance -- - ----------------------------------- - - procedure Validate_Access_Type_Instance is - Desig_Type : constant Entity_Id := - Find_Actual_Type - (Designated_Type (A_Gen_T), Scope (A_Gen_T)); - - begin - if not Is_Access_Type (Act_T) then - Error_Msg_NE - ("expect access type in instantiation of &", Actual, Gen_T); - Abandon_Instantiation (Actual); - end if; - - if Is_Access_Constant (A_Gen_T) then - if not Is_Access_Constant (Act_T) then - Error_Msg_N - ("actual type must be access-to-constant type", Actual); - Abandon_Instantiation (Actual); - end if; - else - if Is_Access_Constant (Act_T) then - Error_Msg_N - ("actual type must be access-to-variable type", Actual); - Abandon_Instantiation (Actual); - - elsif Ekind (A_Gen_T) = E_General_Access_Type - and then Ekind (Base_Type (Act_T)) /= E_General_Access_Type - then - Error_Msg_N ("actual must be general access type!", Actual); - Error_Msg_NE ("add ALL to }!", Actual, Act_T); - Abandon_Instantiation (Actual); - end if; - end if; - - -- The designated subtypes, that is to say the subtypes introduced - -- by an access type declaration (and not by a subtype declaration) - -- must match. - - if not Subtypes_Match - (Desig_Type, Designated_Type (Base_Type (Act_T))) - then - Error_Msg_NE - ("designated type of actual does not match that of formal &", - Actual, Gen_T); - Abandon_Instantiation (Actual); - - elsif Is_Access_Type (Designated_Type (Act_T)) - and then Is_Constrained (Designated_Type (Designated_Type (Act_T))) - /= - Is_Constrained (Designated_Type (Desig_Type)) - then - Error_Msg_NE - ("designated type of actual does not match that of formal &", - Actual, Gen_T); - Abandon_Instantiation (Actual); - end if; - end Validate_Access_Type_Instance; - - ---------------------------------- - -- Validate_Array_Type_Instance -- - ---------------------------------- - - procedure Validate_Array_Type_Instance is - I1 : Node_Id; - I2 : Node_Id; - T2 : Entity_Id; - - function Formal_Dimensions return Int; - -- Count number of dimensions in array type formal - - ----------------------- - -- Formal_Dimensions -- - ----------------------- - - function Formal_Dimensions return Int is - Num : Int := 0; - Index : Node_Id; - - begin - if Nkind (Def) = N_Constrained_Array_Definition then - Index := First (Discrete_Subtype_Definitions (Def)); - else - Index := First (Subtype_Marks (Def)); - end if; - - while Present (Index) loop - Num := Num + 1; - Next_Index (Index); - end loop; - - return Num; - end Formal_Dimensions; - - -- Start of processing for Validate_Array_Type_Instance - - begin - if not Is_Array_Type (Act_T) then - Error_Msg_NE - ("expect array type in instantiation of &", Actual, Gen_T); - Abandon_Instantiation (Actual); - - elsif Nkind (Def) = N_Constrained_Array_Definition then - if not (Is_Constrained (Act_T)) then - Error_Msg_NE - ("expect constrained array in instantiation of &", - Actual, Gen_T); - Abandon_Instantiation (Actual); - end if; - - else - if Is_Constrained (Act_T) then - Error_Msg_NE - ("expect unconstrained array in instantiation of &", - Actual, Gen_T); - Abandon_Instantiation (Actual); - end if; - end if; - - if Formal_Dimensions /= Number_Dimensions (Act_T) then - Error_Msg_NE - ("dimensions of actual do not match formal &", Actual, Gen_T); - Abandon_Instantiation (Actual); - end if; - - I1 := First_Index (A_Gen_T); - I2 := First_Index (Act_T); - for J in 1 .. Formal_Dimensions loop - - -- If the indices of the actual were given by a subtype_mark, - -- the index was transformed into a range attribute. Retrieve - -- the original type mark for checking. - - if Is_Entity_Name (Original_Node (I2)) then - T2 := Entity (Original_Node (I2)); - else - T2 := Etype (I2); - end if; - - if not Subtypes_Match - (Find_Actual_Type (Etype (I1), Scope (A_Gen_T)), T2) - then - Error_Msg_NE - ("index types of actual do not match those of formal &", - Actual, Gen_T); - Abandon_Instantiation (Actual); - end if; - - Next_Index (I1); - Next_Index (I2); - end loop; - - if not Subtypes_Match ( - Find_Actual_Type (Component_Type (A_Gen_T), Scope (A_Gen_T)), - Component_Type (Act_T)) - then - Error_Msg_NE - ("component subtype of actual does not match that of formal &", - Actual, Gen_T); - Abandon_Instantiation (Actual); - end if; - - if Has_Aliased_Components (A_Gen_T) - and then not Has_Aliased_Components (Act_T) - then - Error_Msg_NE - ("actual must have aliased components to match formal type &", - Actual, Gen_T); - end if; - - end Validate_Array_Type_Instance; - - ----------------------------------------------- - -- Validate_Derived_Interface_Type_Instance -- - ----------------------------------------------- - - procedure Validate_Derived_Interface_Type_Instance is - Par : constant Entity_Id := Entity (Subtype_Indication (Def)); - Elmt : Elmt_Id; - - begin - -- First apply interface instance checks - - Validate_Interface_Type_Instance; - - -- Verify that immediate parent interface is an ancestor of - -- the actual. - - if Present (Par) - and then not Interface_Present_In_Ancestor (Act_T, Par) - then - Error_Msg_NE - ("interface actual must include progenitor&", Actual, Par); - end if; - - -- Now verify that the actual includes all other ancestors of - -- the formal. - - Elmt := First_Elmt (Abstract_Interfaces (A_Gen_T)); - while Present (Elmt) loop - if not Interface_Present_In_Ancestor (Act_T, Node (Elmt)) then - Error_Msg_NE - ("interface actual must include progenitor&", - Actual, Node (Elmt)); - end if; - - Next_Elmt (Elmt); - end loop; - end Validate_Derived_Interface_Type_Instance; - - ------------------------------------ - -- Validate_Derived_Type_Instance -- - ------------------------------------ - - procedure Validate_Derived_Type_Instance is - Actual_Discr : Entity_Id; - Ancestor_Discr : Entity_Id; - - begin - -- If the parent type in the generic declaration is itself a previous - -- formal type, then it is local to the generic and absent from the - -- analyzed generic definition. In that case the ancestor is the - -- instance of the formal (which must have been instantiated - -- previously), unless the ancestor is itself a formal derived type. - -- In this latter case (which is the subject of Corrigendum 8652/0038 - -- (AI-202) the ancestor of the formals is the ancestor of its - -- parent. Otherwise, the analyzed generic carries the parent type. - -- If the parent type is defined in a previous formal package, then - -- the scope of that formal package is that of the generic type - -- itself, and it has already been mapped into the corresponding type - -- in the actual package. - - -- Common case: parent type defined outside of the generic - - if Is_Entity_Name (Subtype_Mark (Def)) - and then Present (Entity (Subtype_Mark (Def))) - then - Ancestor := Get_Instance_Of (Entity (Subtype_Mark (Def))); - - -- Check whether parent is defined in a previous formal package - - elsif - Scope (Scope (Base_Type (Etype (A_Gen_T)))) = Scope (A_Gen_T) - then - Ancestor := - Get_Instance_Of (Base_Type (Etype (A_Gen_T))); - - -- The type may be a local derivation, or a type extension of - -- a previous formal, or of a formal of a parent package. - - elsif Is_Derived_Type (Get_Instance_Of (A_Gen_T)) - or else - Ekind (Get_Instance_Of (A_Gen_T)) = E_Record_Type_With_Private - then - -- Check whether the parent is another derived formal type - -- in the same generic unit. - - if Etype (A_Gen_T) /= A_Gen_T - and then Is_Generic_Type (Etype (A_Gen_T)) - and then Scope (Etype (A_Gen_T)) = Scope (A_Gen_T) - and then Etype (Etype (A_Gen_T)) /= Etype (A_Gen_T) - then - -- Locate ancestor of parent from the subtype declaration - -- created for the actual. - - declare - Decl : Node_Id; - - begin - Decl := First (Actual_Decls); - while Present (Decl) loop - if Nkind (Decl) = N_Subtype_Declaration - and then Chars (Defining_Identifier (Decl)) = - Chars (Etype (A_Gen_T)) - then - Ancestor := Generic_Parent_Type (Decl); - exit; - else - Next (Decl); - end if; - end loop; - end; - - pragma Assert (Present (Ancestor)); - - else - Ancestor := - Get_Instance_Of (Base_Type (Get_Instance_Of (A_Gen_T))); - end if; - - else - Ancestor := Get_Instance_Of (Etype (Base_Type (A_Gen_T))); - end if; - - -- Ada 2005 (AI-251) - - if Ada_Version >= Ada_05 - and then Is_Interface (Ancestor) - then - if not Interface_Present_In_Ancestor (Act_T, Ancestor) then - Error_Msg_NE - ("(Ada 2005) expected type implementing & in instantiation", - Actual, Ancestor); - end if; - - elsif not Is_Ancestor (Base_Type (Ancestor), Act_T) then - Error_Msg_NE - ("expect type derived from & in instantiation", - Actual, First_Subtype (Ancestor)); - Abandon_Instantiation (Actual); - end if; - - -- Perform atomic/volatile checks (RM C.6(12)) - - if Is_Atomic (Act_T) and then not Is_Atomic (Ancestor) then - Error_Msg_N - ("cannot have atomic actual type for non-atomic formal type", - Actual); - - elsif Is_Volatile (Act_T) - and then not Is_Volatile (Ancestor) - and then Is_By_Reference_Type (Ancestor) - then - Error_Msg_N - ("cannot have volatile actual type for non-volatile formal type", - Actual); - end if; - - -- It should not be necessary to check for unknown discriminants - -- on Formal, but for some reason Has_Unknown_Discriminants is - -- false for A_Gen_T, so Is_Indefinite_Subtype incorrectly - -- returns False. This needs fixing. ??? - - if not Is_Indefinite_Subtype (A_Gen_T) - and then not Unknown_Discriminants_Present (Formal) - and then Is_Indefinite_Subtype (Act_T) - then - Error_Msg_N - ("actual subtype must be constrained", Actual); - Abandon_Instantiation (Actual); - end if; - - if not Unknown_Discriminants_Present (Formal) then - if Is_Constrained (Ancestor) then - if not Is_Constrained (Act_T) then - Error_Msg_N - ("actual subtype must be constrained", Actual); - Abandon_Instantiation (Actual); - end if; - - -- Ancestor is unconstrained - - elsif Is_Constrained (Act_T) then - if Ekind (Ancestor) = E_Access_Type - or else Is_Composite_Type (Ancestor) - then - Error_Msg_N - ("actual subtype must be unconstrained", Actual); - Abandon_Instantiation (Actual); - end if; - - -- A class-wide type is only allowed if the formal has - -- unknown discriminants. - - elsif Is_Class_Wide_Type (Act_T) - and then not Has_Unknown_Discriminants (Ancestor) - then - Error_Msg_NE - ("actual for & cannot be a class-wide type", Actual, Gen_T); - Abandon_Instantiation (Actual); - - -- Otherwise, the formal and actual shall have the same - -- number of discriminants and each discriminant of the - -- actual must correspond to a discriminant of the formal. - - elsif Has_Discriminants (Act_T) - and then not Has_Unknown_Discriminants (Act_T) - and then Has_Discriminants (Ancestor) - then - Actual_Discr := First_Discriminant (Act_T); - Ancestor_Discr := First_Discriminant (Ancestor); - while Present (Actual_Discr) - and then Present (Ancestor_Discr) - loop - if Base_Type (Act_T) /= Base_Type (Ancestor) and then - No (Corresponding_Discriminant (Actual_Discr)) - then - Error_Msg_NE - ("discriminant & does not correspond " & - "to ancestor discriminant", Actual, Actual_Discr); - Abandon_Instantiation (Actual); - end if; - - Next_Discriminant (Actual_Discr); - Next_Discriminant (Ancestor_Discr); - end loop; - - if Present (Actual_Discr) or else Present (Ancestor_Discr) then - Error_Msg_NE - ("actual for & must have same number of discriminants", - Actual, Gen_T); - Abandon_Instantiation (Actual); - end if; - - -- This case should be caught by the earlier check for - -- for constrainedness, but the check here is added for - -- completeness. - - elsif Has_Discriminants (Act_T) - and then not Has_Unknown_Discriminants (Act_T) - then - Error_Msg_NE - ("actual for & must not have discriminants", Actual, Gen_T); - Abandon_Instantiation (Actual); - - elsif Has_Discriminants (Ancestor) then - Error_Msg_NE - ("actual for & must have known discriminants", Actual, Gen_T); - Abandon_Instantiation (Actual); - end if; - - if not Subtypes_Statically_Compatible (Act_T, Ancestor) then - Error_Msg_N - ("constraint on actual is incompatible with formal", Actual); - Abandon_Instantiation (Actual); - end if; - end if; - end Validate_Derived_Type_Instance; - - -------------------------------------- - -- Validate_Interface_Type_Instance -- - -------------------------------------- - - procedure Validate_Interface_Type_Instance is - begin - if not Is_Interface (Act_T) then - Error_Msg_NE - ("actual for formal interface type must be an interface", - Actual, Gen_T); - - elsif Is_Limited_Type (Act_T) /= Is_Limited_Type (A_Gen_T) - or else - Is_Task_Interface (A_Gen_T) /= Is_Task_Interface (Act_T) - or else - Is_Protected_Interface (A_Gen_T) /= - Is_Protected_Interface (Act_T) - or else - Is_Synchronized_Interface (A_Gen_T) /= - Is_Synchronized_Interface (Act_T) - then - Error_Msg_NE - ("actual for interface& does not match ('R'M 12.5.5(5))", - Actual, Gen_T); - end if; - end Validate_Interface_Type_Instance; - - ------------------------------------ - -- Validate_Private_Type_Instance -- - ------------------------------------ - - procedure Validate_Private_Type_Instance is - Formal_Discr : Entity_Id; - Actual_Discr : Entity_Id; - Formal_Subt : Entity_Id; - - begin - if Is_Limited_Type (Act_T) - and then not Is_Limited_Type (A_Gen_T) - then - Error_Msg_NE - ("actual for non-limited & cannot be a limited type", Actual, - Gen_T); - Explain_Limited_Type (Act_T, Actual); - Abandon_Instantiation (Actual); - - elsif Is_Indefinite_Subtype (Act_T) - and then not Is_Indefinite_Subtype (A_Gen_T) - and then Ada_Version >= Ada_95 - then - Error_Msg_NE - ("actual for & must be a definite subtype", Actual, Gen_T); - - elsif not Is_Tagged_Type (Act_T) - and then Is_Tagged_Type (A_Gen_T) - then - Error_Msg_NE - ("actual for & must be a tagged type", Actual, Gen_T); - - elsif Has_Discriminants (A_Gen_T) then - if not Has_Discriminants (Act_T) then - Error_Msg_NE - ("actual for & must have discriminants", Actual, Gen_T); - Abandon_Instantiation (Actual); - - elsif Is_Constrained (Act_T) then - Error_Msg_NE - ("actual for & must be unconstrained", Actual, Gen_T); - Abandon_Instantiation (Actual); - - else - Formal_Discr := First_Discriminant (A_Gen_T); - Actual_Discr := First_Discriminant (Act_T); - while Formal_Discr /= Empty loop - if Actual_Discr = Empty then - Error_Msg_NE - ("discriminants on actual do not match formal", - Actual, Gen_T); - Abandon_Instantiation (Actual); - end if; - - Formal_Subt := Get_Instance_Of (Etype (Formal_Discr)); - - -- Access discriminants match if designated types do - - if Ekind (Base_Type (Formal_Subt)) = E_Anonymous_Access_Type - and then (Ekind (Base_Type (Etype (Actual_Discr)))) = - E_Anonymous_Access_Type - and then - Get_Instance_Of - (Designated_Type (Base_Type (Formal_Subt))) = - Designated_Type (Base_Type (Etype (Actual_Discr))) - then - null; - - elsif Base_Type (Formal_Subt) /= - Base_Type (Etype (Actual_Discr)) - then - Error_Msg_NE - ("types of actual discriminants must match formal", - Actual, Gen_T); - Abandon_Instantiation (Actual); - - elsif not Subtypes_Statically_Match - (Formal_Subt, Etype (Actual_Discr)) - and then Ada_Version >= Ada_95 - then - Error_Msg_NE - ("subtypes of actual discriminants must match formal", - Actual, Gen_T); - Abandon_Instantiation (Actual); - end if; - - Next_Discriminant (Formal_Discr); - Next_Discriminant (Actual_Discr); - end loop; - - if Actual_Discr /= Empty then - Error_Msg_NE - ("discriminants on actual do not match formal", - Actual, Gen_T); - Abandon_Instantiation (Actual); - end if; - end if; - - end if; - - Ancestor := Gen_T; - end Validate_Private_Type_Instance; - - -- Start of processing for Instantiate_Type - - begin - if Get_Instance_Of (A_Gen_T) /= A_Gen_T then - Error_Msg_N ("duplicate instantiation of generic type", Actual); - return Error; - - elsif not Is_Entity_Name (Actual) - or else not Is_Type (Entity (Actual)) - then - Error_Msg_NE - ("expect valid subtype mark to instantiate &", Actual, Gen_T); - Abandon_Instantiation (Actual); - - else - Act_T := Entity (Actual); - - -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed - -- as a generic actual parameter if the corresponding formal type - -- does not have a known_discriminant_part, or is a formal derived - -- type that is an Unchecked_Union type. - - if Is_Unchecked_Union (Base_Type (Act_T)) then - if not Has_Discriminants (A_Gen_T) - or else - (Is_Derived_Type (A_Gen_T) - and then - Is_Unchecked_Union (A_Gen_T)) - then - null; - else - Error_Msg_N ("Unchecked_Union cannot be the actual for a" & - " discriminated formal type", Act_T); - - end if; - end if; - - -- Deal with fixed/floating restrictions - - if Is_Floating_Point_Type (Act_T) then - Check_Restriction (No_Floating_Point, Actual); - elsif Is_Fixed_Point_Type (Act_T) then - Check_Restriction (No_Fixed_Point, Actual); - end if; - - -- Deal with error of using incomplete type as generic actual - - if Ekind (Act_T) = E_Incomplete_Type then - if No (Underlying_Type (Act_T)) then - Error_Msg_N ("premature use of incomplete type", Actual); - Abandon_Instantiation (Actual); - else - Act_T := Full_View (Act_T); - Set_Entity (Actual, Act_T); - - if Has_Private_Component (Act_T) then - Error_Msg_N - ("premature use of type with private component", Actual); - end if; - end if; - - -- Deal with error of premature use of private type as generic actual - - elsif Is_Private_Type (Act_T) - and then Is_Private_Type (Base_Type (Act_T)) - and then not Is_Generic_Type (Act_T) - and then not Is_Derived_Type (Act_T) - and then No (Full_View (Root_Type (Act_T))) - then - Error_Msg_N ("premature use of private type", Actual); - - elsif Has_Private_Component (Act_T) then - Error_Msg_N - ("premature use of type with private component", Actual); - end if; - - Set_Instance_Of (A_Gen_T, Act_T); - - -- If the type is generic, the class-wide type may also be used - - if Is_Tagged_Type (A_Gen_T) - and then Is_Tagged_Type (Act_T) - and then not Is_Class_Wide_Type (A_Gen_T) - then - Set_Instance_Of (Class_Wide_Type (A_Gen_T), - Class_Wide_Type (Act_T)); - end if; - - if not Is_Abstract (A_Gen_T) - and then Is_Abstract (Act_T) - then - Error_Msg_N - ("actual of non-abstract formal cannot be abstract", Actual); - end if; - - if Is_Scalar_Type (Gen_T) then - Set_Instance_Of (Etype (A_Gen_T), Etype (Act_T)); - end if; - end if; - - case Nkind (Def) is - when N_Formal_Private_Type_Definition => - Validate_Private_Type_Instance; - - when N_Formal_Derived_Type_Definition => - Validate_Derived_Type_Instance; - - when N_Formal_Discrete_Type_Definition => - if not Is_Discrete_Type (Act_T) then - Error_Msg_NE - ("expect discrete type in instantiation of&", Actual, Gen_T); - Abandon_Instantiation (Actual); - end if; - - when N_Formal_Signed_Integer_Type_Definition => - if not Is_Signed_Integer_Type (Act_T) then - Error_Msg_NE - ("expect signed integer type in instantiation of&", - Actual, Gen_T); - Abandon_Instantiation (Actual); - end if; - - when N_Formal_Modular_Type_Definition => - if not Is_Modular_Integer_Type (Act_T) then - Error_Msg_NE - ("expect modular type in instantiation of &", Actual, Gen_T); - Abandon_Instantiation (Actual); - end if; - - when N_Formal_Floating_Point_Definition => - if not Is_Floating_Point_Type (Act_T) then - Error_Msg_NE - ("expect float type in instantiation of &", Actual, Gen_T); - Abandon_Instantiation (Actual); - end if; - - when N_Formal_Ordinary_Fixed_Point_Definition => - if not Is_Ordinary_Fixed_Point_Type (Act_T) then - Error_Msg_NE - ("expect ordinary fixed point type in instantiation of &", - Actual, Gen_T); - Abandon_Instantiation (Actual); - end if; - - when N_Formal_Decimal_Fixed_Point_Definition => - if not Is_Decimal_Fixed_Point_Type (Act_T) then - Error_Msg_NE - ("expect decimal type in instantiation of &", - Actual, Gen_T); - Abandon_Instantiation (Actual); - end if; - - when N_Array_Type_Definition => - Validate_Array_Type_Instance; - - when N_Access_To_Object_Definition => - Validate_Access_Type_Instance; - - when N_Access_Function_Definition | - N_Access_Procedure_Definition => - Validate_Access_Subprogram_Instance; - - when N_Record_Definition => - Validate_Interface_Type_Instance; - - when N_Derived_Type_Definition => - Validate_Derived_Interface_Type_Instance; - - when others => - raise Program_Error; - - end case; - - Decl_Node := - Make_Subtype_Declaration (Loc, - Defining_Identifier => New_Copy (Gen_T), - Subtype_Indication => New_Reference_To (Act_T, Loc)); - - if Is_Private_Type (Act_T) then - Set_Has_Private_View (Subtype_Indication (Decl_Node)); - - elsif Is_Access_Type (Act_T) - and then Is_Private_Type (Designated_Type (Act_T)) - then - Set_Has_Private_View (Subtype_Indication (Decl_Node)); - end if; - - -- Flag actual derived types so their elaboration produces the - -- appropriate renamings for the primitive operations of the ancestor. - -- Flag actual for formal private types as well, to determine whether - -- operations in the private part may override inherited operations. - - if Nkind (Def) = N_Formal_Derived_Type_Definition - or else Nkind (Def) = N_Formal_Private_Type_Definition - then - Set_Generic_Parent_Type (Decl_Node, Ancestor); - end if; - - return Decl_Node; - end Instantiate_Type; - - --------------------- - -- Is_In_Main_Unit -- - --------------------- - - function Is_In_Main_Unit (N : Node_Id) return Boolean is - Unum : constant Unit_Number_Type := Get_Source_Unit (N); - Current_Unit : Node_Id; - - begin - if Unum = Main_Unit then - return True; - - -- If the current unit is a subunit then it is either the main unit - -- or is being compiled as part of the main unit. - - elsif Nkind (N) = N_Compilation_Unit then - return Nkind (Unit (N)) = N_Subunit; - end if; - - Current_Unit := Parent (N); - while Present (Current_Unit) - and then Nkind (Current_Unit) /= N_Compilation_Unit - loop - Current_Unit := Parent (Current_Unit); - end loop; - - -- The instantiation node is in the main unit, or else the current - -- node (perhaps as the result of nested instantiations) is in the - -- main unit, or in the declaration of the main unit, which in this - -- last case must be a body. - - return Unum = Main_Unit - or else Current_Unit = Cunit (Main_Unit) - or else Current_Unit = Library_Unit (Cunit (Main_Unit)) - or else (Present (Library_Unit (Current_Unit)) - and then Is_In_Main_Unit (Library_Unit (Current_Unit))); - end Is_In_Main_Unit; - - ---------------------------- - -- Load_Parent_Of_Generic -- - ---------------------------- - - procedure Load_Parent_Of_Generic (N : Node_Id; Spec : Node_Id) is - Comp_Unit : constant Node_Id := Cunit (Get_Source_Unit (Spec)); - Save_Style_Check : constant Boolean := Style_Check; - True_Parent : Node_Id; - Inst_Node : Node_Id; - OK : Boolean; - - begin - if not In_Same_Source_Unit (N, Spec) - or else Nkind (Unit (Comp_Unit)) = N_Package_Declaration - or else (Nkind (Unit (Comp_Unit)) = N_Package_Body - and then not Is_In_Main_Unit (Spec)) - then - -- Find body of parent of spec, and analyze it. A special case - -- arises when the parent is an instantiation, that is to say when - -- we are currently instantiating a nested generic. In that case, - -- there is no separate file for the body of the enclosing instance. - -- Instead, the enclosing body must be instantiated as if it were - -- a pending instantiation, in order to produce the body for the - -- nested generic we require now. Note that in that case the - -- generic may be defined in a package body, the instance defined - -- in the same package body, and the original enclosing body may not - -- be in the main unit. - - True_Parent := Parent (Spec); - Inst_Node := Empty; - - while Present (True_Parent) - and then Nkind (True_Parent) /= N_Compilation_Unit - loop - if Nkind (True_Parent) = N_Package_Declaration - and then - Nkind (Original_Node (True_Parent)) = N_Package_Instantiation - then - -- Parent is a compilation unit that is an instantiation. - -- Instantiation node has been replaced with package decl. - - Inst_Node := Original_Node (True_Parent); - exit; - - elsif Nkind (True_Parent) = N_Package_Declaration - and then Present (Generic_Parent (Specification (True_Parent))) - and then Nkind (Parent (True_Parent)) /= N_Compilation_Unit - then - -- Parent is an instantiation within another specification. - -- Declaration for instance has been inserted before original - -- instantiation node. A direct link would be preferable? - - Inst_Node := Next (True_Parent); - - while Present (Inst_Node) - and then Nkind (Inst_Node) /= N_Package_Instantiation - loop - Next (Inst_Node); - end loop; - - -- If the instance appears within a generic, and the generic - -- unit is defined within a formal package of the enclosing - -- generic, there is no generic body available, and none - -- needed. A more precise test should be used ??? - - if No (Inst_Node) then - return; - end if; - - exit; - else - True_Parent := Parent (True_Parent); - end if; - end loop; - - -- Case where we are currently instantiating a nested generic - - if Present (Inst_Node) then - if Nkind (Parent (True_Parent)) = N_Compilation_Unit then - - -- Instantiation node and declaration of instantiated package - -- were exchanged when only the declaration was needed. - -- Restore instantiation node before proceeding with body. - - Set_Unit (Parent (True_Parent), Inst_Node); - end if; - - -- Now complete instantiation of enclosing body, if it appears - -- in some other unit. If it appears in the current unit, the - -- body will have been instantiated already. - - if No (Corresponding_Body (Instance_Spec (Inst_Node))) then - - -- We need to determine the expander mode to instantiate - -- the enclosing body. Because the generic body we need - -- may use global entities declared in the enclosing package - -- (including aggregates) it is in general necessary to - -- compile this body with expansion enabled. The exception - -- is if we are within a generic package, in which case - -- the usual generic rule applies. - - declare - Exp_Status : Boolean := True; - Scop : Entity_Id; - - begin - -- Loop through scopes looking for generic package - - Scop := Scope (Defining_Entity (Instance_Spec (Inst_Node))); - while Present (Scop) - and then Scop /= Standard_Standard - loop - if Ekind (Scop) = E_Generic_Package then - Exp_Status := False; - exit; - end if; - - Scop := Scope (Scop); - end loop; - - Instantiate_Package_Body - (Pending_Body_Info'( - Inst_Node, True_Parent, Exp_Status, - Get_Code_Unit (Sloc (Inst_Node)))); - end; - end if; - - -- Case where we are not instantiating a nested generic - - else - Opt.Style_Check := False; - Expander_Mode_Save_And_Set (True); - Load_Needed_Body (Comp_Unit, OK); - Opt.Style_Check := Save_Style_Check; - Expander_Mode_Restore; - - if not OK - and then Unit_Requires_Body (Defining_Entity (Spec)) - then - declare - Bname : constant Unit_Name_Type := - Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit))); - - begin - Error_Msg_Unit_1 := Bname; - Error_Msg_N ("this instantiation requires$!", N); - Error_Msg_Name_1 := - Get_File_Name (Bname, Subunit => False); - Error_Msg_N ("\but file{ was not found!", N); - raise Unrecoverable_Error; - end; - end if; - end if; - end if; - - -- If loading the parent of the generic caused an instantiation - -- circularity, we abandon compilation at this point, because - -- otherwise in some cases we get into trouble with infinite - -- recursions after this point. - - if Circularity_Detected then - raise Unrecoverable_Error; - end if; - end Load_Parent_Of_Generic; - - ----------------------- - -- Move_Freeze_Nodes -- - ----------------------- - - procedure Move_Freeze_Nodes - (Out_Of : Entity_Id; - After : Node_Id; - L : List_Id) - is - Decl : Node_Id; - Next_Decl : Node_Id; - Next_Node : Node_Id := After; - Spec : Node_Id; - - function Is_Outer_Type (T : Entity_Id) return Boolean; - -- Check whether entity is declared in a scope external to that - -- of the generic unit. - - ------------------- - -- Is_Outer_Type -- - ------------------- - - function Is_Outer_Type (T : Entity_Id) return Boolean is - Scop : Entity_Id := Scope (T); - - begin - if Scope_Depth (Scop) < Scope_Depth (Out_Of) then - return True; - - else - while Scop /= Standard_Standard loop - - if Scop = Out_Of then - return False; - else - Scop := Scope (Scop); - end if; - end loop; - - return True; - end if; - end Is_Outer_Type; - - -- Start of processing for Move_Freeze_Nodes - - begin - if No (L) then - return; - end if; - - -- First remove the freeze nodes that may appear before all other - -- declarations. - - Decl := First (L); - while Present (Decl) - and then Nkind (Decl) = N_Freeze_Entity - and then Is_Outer_Type (Entity (Decl)) - loop - Decl := Remove_Head (L); - Insert_After (Next_Node, Decl); - Set_Analyzed (Decl, False); - Next_Node := Decl; - Decl := First (L); - end loop; - - -- Next scan the list of declarations and remove each freeze node that - -- appears ahead of the current node. - - while Present (Decl) loop - while Present (Next (Decl)) - and then Nkind (Next (Decl)) = N_Freeze_Entity - and then Is_Outer_Type (Entity (Next (Decl))) - loop - Next_Decl := Remove_Next (Decl); - Insert_After (Next_Node, Next_Decl); - Set_Analyzed (Next_Decl, False); - Next_Node := Next_Decl; - end loop; - - -- If the declaration is a nested package or concurrent type, then - -- recurse. Nested generic packages will have been processed from the - -- inside out. - - if Nkind (Decl) = N_Package_Declaration then - Spec := Specification (Decl); - - elsif Nkind (Decl) = N_Task_Type_Declaration then - Spec := Task_Definition (Decl); - - elsif Nkind (Decl) = N_Protected_Type_Declaration then - Spec := Protected_Definition (Decl); - - else - Spec := Empty; - end if; - - if Present (Spec) then - Move_Freeze_Nodes (Out_Of, Next_Node, - Visible_Declarations (Spec)); - Move_Freeze_Nodes (Out_Of, Next_Node, - Private_Declarations (Spec)); - end if; - - Next (Decl); - end loop; - end Move_Freeze_Nodes; - - ---------------- - -- Next_Assoc -- - ---------------- - - function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr is - begin - return Generic_Renamings.Table (E).Next_In_HTable; - end Next_Assoc; - - ------------------------ - -- Preanalyze_Actuals -- - ------------------------ - - procedure Pre_Analyze_Actuals (N : Node_Id) is - Assoc : Node_Id; - Act : Node_Id; - Errs : constant Int := Serious_Errors_Detected; - - begin - Assoc := First (Generic_Associations (N)); - - while Present (Assoc) loop - Act := Explicit_Generic_Actual_Parameter (Assoc); - - -- Within a nested instantiation, a defaulted actual is an - -- empty association, so nothing to analyze. If the actual for - -- a subprogram is an attribute, analyze prefix only, because - -- actual is not a complete attribute reference. - - -- If actual is an allocator, analyze expression only. The full - -- analysis can generate code, and if the instance is a compilation - -- unit we have to wait until the package instance is installed to - -- have a proper place to insert this code. - - -- String literals may be operators, but at this point we do not - -- know whether the actual is a formal subprogram or a string. - - if No (Act) then - null; - - elsif Nkind (Act) = N_Attribute_Reference then - Analyze (Prefix (Act)); - - elsif Nkind (Act) = N_Explicit_Dereference then - Analyze (Prefix (Act)); - - elsif Nkind (Act) = N_Allocator then - declare - Expr : constant Node_Id := Expression (Act); - - begin - if Nkind (Expr) = N_Subtype_Indication then - Analyze (Subtype_Mark (Expr)); - Analyze_List (Constraints (Constraint (Expr))); - else - Analyze (Expr); - end if; - end; - - elsif Nkind (Act) /= N_Operator_Symbol then - Analyze (Act); - end if; - - if Errs /= Serious_Errors_Detected then - Abandon_Instantiation (Act); - end if; - - Next (Assoc); - end loop; - end Pre_Analyze_Actuals; - - ------------------- - -- Remove_Parent -- - ------------------- - - procedure Remove_Parent (In_Body : Boolean := False) is - S : Entity_Id := Current_Scope; - E : Entity_Id; - P : Entity_Id; - Hidden : Elmt_Id; - - begin - -- After child instantiation is complete, remove from scope stack - -- the extra copy of the current scope, and then remove parent - -- instances. - - if not In_Body then - Pop_Scope; - - while Current_Scope /= S loop - P := Current_Scope; - End_Package_Scope (Current_Scope); - - if In_Open_Scopes (P) then - E := First_Entity (P); - - while Present (E) loop - Set_Is_Immediately_Visible (E, True); - Next_Entity (E); - end loop; - - if Is_Generic_Instance (Current_Scope) - and then P /= Current_Scope - then - -- We are within an instance of some sibling. Retain - -- visibility of parent, for proper subsequent cleanup, - -- and reinstall private declarations as well. - - Set_In_Private_Part (P); - Install_Private_Declarations (P); - end if; - - -- If the ultimate parent is a top-level unit recorded in - -- Instance_Parent_Unit, then reset its visibility to what - -- it was before instantiation. (It's not clear what the - -- purpose is of testing whether Scope (P) is In_Open_Scopes, - -- but that test was present before the ultimate parent test - -- was added.???) - - elsif not In_Open_Scopes (Scope (P)) - or else (P = Instance_Parent_Unit - and then not Parent_Unit_Visible) - then - Set_Is_Immediately_Visible (P, False); - end if; - end loop; - - -- Reset visibility of entities in the enclosing scope - - Set_Is_Hidden_Open_Scope (Current_Scope, False); - Hidden := First_Elmt (Hidden_Entities); - - while Present (Hidden) loop - Set_Is_Immediately_Visible (Node (Hidden), True); - Next_Elmt (Hidden); - end loop; - - else - -- Each body is analyzed separately, and there is no context - -- that needs preserving from one body instance to the next, - -- so remove all parent scopes that have been installed. - - while Present (S) loop - End_Package_Scope (S); - Set_Is_Immediately_Visible (S, False); - S := Current_Scope; - exit when S = Standard_Standard; - end loop; - end if; - - end Remove_Parent; - - ----------------- - -- Restore_Env -- - ----------------- - - procedure Restore_Env is - Saved : Instance_Env renames Instance_Envs.Table (Instance_Envs.Last); - - begin - Ada_Version := Saved.Ada_Version; - Ada_Version_Explicit := Saved.Ada_Version_Explicit; - - if No (Current_Instantiated_Parent.Act_Id) then - - -- Restore environment after subprogram inlining - - Restore_Private_Views (Empty); - end if; - - Current_Instantiated_Parent := Saved.Instantiated_Parent; - Exchanged_Views := Saved.Exchanged_Views; - Hidden_Entities := Saved.Hidden_Entities; - Current_Sem_Unit := Saved.Current_Sem_Unit; - Parent_Unit_Visible := Saved.Parent_Unit_Visible; - Instance_Parent_Unit := Saved.Instance_Parent_Unit; - - Instance_Envs.Decrement_Last; - end Restore_Env; - - --------------------------- - -- Restore_Private_Views -- - --------------------------- - - procedure Restore_Private_Views - (Pack_Id : Entity_Id; - Is_Package : Boolean := True) - is - M : Elmt_Id; - E : Entity_Id; - Typ : Entity_Id; - Dep_Elmt : Elmt_Id; - Dep_Typ : Node_Id; - - procedure Restore_Nested_Formal (Formal : Entity_Id); - -- Hide the generic formals of formal packages declared with box - -- which were reachable in the current instantiation. - - procedure Restore_Nested_Formal (Formal : Entity_Id) is - Ent : Entity_Id; - begin - if Present (Renamed_Object (Formal)) - and then Denotes_Formal_Package (Renamed_Object (Formal), True) - then - return; - - elsif Present (Associated_Formal_Package (Formal)) - and then Box_Present (Parent (Associated_Formal_Package (Formal))) - then - Ent := First_Entity (Formal); - - while Present (Ent) loop - exit when Ekind (Ent) = E_Package - and then Renamed_Entity (Ent) = Renamed_Entity (Formal); - - Set_Is_Hidden (Ent); - Set_Is_Potentially_Use_Visible (Ent, False); - - -- If package, then recurse - - if Ekind (Ent) = E_Package then - Restore_Nested_Formal (Ent); - end if; - - Next_Entity (Ent); - end loop; - end if; - end Restore_Nested_Formal; - - begin - M := First_Elmt (Exchanged_Views); - while Present (M) loop - Typ := Node (M); - - -- Subtypes of types whose views have been exchanged, and that - -- are defined within the instance, were not on the list of - -- Private_Dependents on entry to the instance, so they have to - -- be exchanged explicitly now, in order to remain consistent with - -- the view of the parent type. - - if Ekind (Typ) = E_Private_Type - or else Ekind (Typ) = E_Limited_Private_Type - or else Ekind (Typ) = E_Record_Type_With_Private - then - Dep_Elmt := First_Elmt (Private_Dependents (Typ)); - - while Present (Dep_Elmt) loop - Dep_Typ := Node (Dep_Elmt); - - if Scope (Dep_Typ) = Pack_Id - and then Present (Full_View (Dep_Typ)) - then - Replace_Elmt (Dep_Elmt, Full_View (Dep_Typ)); - Exchange_Declarations (Dep_Typ); - end if; - - Next_Elmt (Dep_Elmt); - end loop; - end if; - - Exchange_Declarations (Node (M)); - Next_Elmt (M); - end loop; - - if No (Pack_Id) then - return; - end if; - - -- Make the generic formal parameters private, and make the formal - -- types into subtypes of the actuals again. - - E := First_Entity (Pack_Id); - - while Present (E) loop - Set_Is_Hidden (E, True); - - if Is_Type (E) - and then Nkind (Parent (E)) = N_Subtype_Declaration - then - Set_Is_Generic_Actual_Type (E, False); - - -- An unusual case of aliasing: the actual may also be directly - -- visible in the generic, and be private there, while it is - -- fully visible in the context of the instance. The internal - -- subtype is private in the instance, but has full visibility - -- like its parent in the enclosing scope. This enforces the - -- invariant that the privacy status of all private dependents of - -- a type coincide with that of the parent type. This can only - -- happen when a generic child unit is instantiated within a - -- sibling. - - if Is_Private_Type (E) - and then not Is_Private_Type (Etype (E)) - then - Exchange_Declarations (E); - end if; - - elsif Ekind (E) = E_Package then - - -- The end of the renaming list is the renaming of the generic - -- package itself. If the instance is a subprogram, all entities - -- in the corresponding package are renamings. If this entity is - -- a formal package, make its own formals private as well. The - -- actual in this case is itself the renaming of an instantation. - -- If the entity is not a package renaming, it is the entity - -- created to validate formal package actuals: ignore. - - -- If the actual is itself a formal package for the enclosing - -- generic, or the actual for such a formal package, it remains - -- visible on exit from the instance, and therefore nothing - -- needs to be done either, except to keep it accessible. - - if Is_Package - and then Renamed_Object (E) = Pack_Id - then - exit; - - elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then - null; - - elsif Denotes_Formal_Package (Renamed_Object (E), True) then - Set_Is_Hidden (E, False); - - else - declare - Act_P : constant Entity_Id := Renamed_Object (E); - Id : Entity_Id; - - begin - Id := First_Entity (Act_P); - while Present (Id) - and then Id /= First_Private_Entity (Act_P) - loop - exit when Ekind (Id) = E_Package - and then Renamed_Object (Id) = Act_P; - - Set_Is_Hidden (Id, True); - Set_Is_Potentially_Use_Visible (Id, In_Use (Act_P)); - - if Ekind (Id) = E_Package then - Restore_Nested_Formal (Id); - end if; - - Next_Entity (Id); - end loop; - end; - end if; - end if; - - Next_Entity (E); - end loop; - end Restore_Private_Views; - - -------------- - -- Save_Env -- - -------------- - - procedure Save_Env - (Gen_Unit : Entity_Id; - Act_Unit : Entity_Id) - is - begin - Init_Env; - Set_Instance_Env (Gen_Unit, Act_Unit); - end Save_Env; - - ---------------------------- - -- Save_Global_References -- - ---------------------------- - - procedure Save_Global_References (N : Node_Id) is - Gen_Scope : Entity_Id; - E : Entity_Id; - N2 : Node_Id; - - function Is_Global (E : Entity_Id) return Boolean; - -- Check whether entity is defined outside of generic unit. - -- Examine the scope of an entity, and the scope of the scope, - -- etc, until we find either Standard, in which case the entity - -- is global, or the generic unit itself, which indicates that - -- the entity is local. If the entity is the generic unit itself, - -- as in the case of a recursive call, or the enclosing generic unit, - -- if different from the current scope, then it is local as well, - -- because it will be replaced at the point of instantiation. On - -- the other hand, if it is a reference to a child unit of a common - -- ancestor, which appears in an instantiation, it is global because - -- it is used to denote a specific compilation unit at the time the - -- instantiations will be analyzed. - - procedure Reset_Entity (N : Node_Id); - -- Save semantic information on global entity, so that it is not - -- resolved again at instantiation time. - - procedure Save_Entity_Descendants (N : Node_Id); - -- Apply Save_Global_References to the two syntactic descendants of - -- non-terminal nodes that carry an Associated_Node and are processed - -- through Reset_Entity. Once the global entity (if any) has been - -- captured together with its type, only two syntactic descendants - -- need to be traversed to complete the processing of the tree rooted - -- at N. This applies to Selected_Components, Expanded_Names, and to - -- Operator nodes. N can also be a character literal, identifier, or - -- operator symbol node, but the call has no effect in these cases. - - procedure Save_Global_Defaults (N1, N2 : Node_Id); - -- Default actuals in nested instances must be handled specially - -- because there is no link to them from the original tree. When an - -- actual subprogram is given by a default, we add an explicit generic - -- association for it in the instantiation node. When we save the - -- global references on the name of the instance, we recover the list - -- of generic associations, and add an explicit one to the original - -- generic tree, through which a global actual can be preserved. - -- Similarly, if a child unit is instantiated within a sibling, in the - -- context of the parent, we must preserve the identifier of the parent - -- so that it can be properly resolved in a subsequent instantiation. - - procedure Save_Global_Descendant (D : Union_Id); - -- Apply Save_Global_References recursively to the descendents of - -- current node. - - procedure Save_References (N : Node_Id); - -- This is the recursive procedure that does the work, once the - -- enclosing generic scope has been established. - - --------------- - -- Is_Global -- - --------------- - - function Is_Global (E : Entity_Id) return Boolean is - Se : Entity_Id := Scope (E); - - function Is_Instance_Node (Decl : Node_Id) return Boolean; - -- Determine whether the parent node of a reference to a child unit - -- denotes an instantiation or a formal package, in which case the - -- reference to the child unit is global, even if it appears within - -- the current scope (e.g. when the instance appears within the body - -- of an ancestor). - - ---------------------- - -- Is_Instance_Node -- - ---------------------- - - function Is_Instance_Node (Decl : Node_Id) return Boolean is - begin - return (Nkind (Decl) in N_Generic_Instantiation - or else - Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration); - end Is_Instance_Node; - - -- Start of processing for Is_Global - - begin - if E = Gen_Scope then - return False; - - elsif E = Standard_Standard then - return True; - - elsif Is_Child_Unit (E) - and then (Is_Instance_Node (Parent (N2)) - or else (Nkind (Parent (N2)) = N_Expanded_Name - and then N2 = Selector_Name (Parent (N2)) - and then Is_Instance_Node (Parent (Parent (N2))))) - then - return True; - - else - while Se /= Gen_Scope loop - if Se = Standard_Standard then - return True; - else - Se := Scope (Se); - end if; - end loop; - - return False; - end if; - end Is_Global; - - ------------------ - -- Reset_Entity -- - ------------------ - - procedure Reset_Entity (N : Node_Id) is - - procedure Set_Global_Type (N : Node_Id; N2 : Node_Id); - -- The type of N2 is global to the generic unit. Save the - -- type in the generic node. - - function Top_Ancestor (E : Entity_Id) return Entity_Id; - -- Find the ultimate ancestor of the current unit. If it is - -- not a generic unit, then the name of the current unit - -- in the prefix of an expanded name must be replaced with - -- its generic homonym to ensure that it will be properly - -- resolved in an instance. - - --------------------- - -- Set_Global_Type -- - --------------------- - - procedure Set_Global_Type (N : Node_Id; N2 : Node_Id) is - Typ : constant Entity_Id := Etype (N2); - - begin - Set_Etype (N, Typ); - - if Entity (N) /= N2 - and then Has_Private_View (Entity (N)) - then - -- If the entity of N is not the associated node, this is - -- a nested generic and it has an associated node as well, - -- whose type is already the full view (see below). Indicate - -- that the original node has a private view. - - Set_Has_Private_View (N); - end if; - - -- If not a private type, nothing else to do - - if not Is_Private_Type (Typ) then - if Is_Array_Type (Typ) - and then Is_Private_Type (Component_Type (Typ)) - then - Set_Has_Private_View (N); - end if; - - -- If it is a derivation of a private type in a context where - -- no full view is needed, nothing to do either. - - elsif No (Full_View (Typ)) and then Typ /= Etype (Typ) then - null; - - -- Otherwise mark the type for flipping and use the full_view - -- when available. - - else - Set_Has_Private_View (N); - - if Present (Full_View (Typ)) then - Set_Etype (N2, Full_View (Typ)); - end if; - end if; - end Set_Global_Type; - - ------------------ - -- Top_Ancestor -- - ------------------ - - function Top_Ancestor (E : Entity_Id) return Entity_Id is - Par : Entity_Id := E; - - begin - while Is_Child_Unit (Par) loop - Par := Scope (Par); - end loop; - - return Par; - end Top_Ancestor; - - -- Start of processing for Reset_Entity - - begin - N2 := Get_Associated_Node (N); - E := Entity (N2); - - if Present (E) then - if Is_Global (E) then - Set_Global_Type (N, N2); - - elsif Nkind (N) = N_Op_Concat - and then Is_Generic_Type (Etype (N2)) - and then - (Base_Type (Etype (Right_Opnd (N2))) = Etype (N2) - or else Base_Type (Etype (Left_Opnd (N2))) = Etype (N2)) - and then Is_Intrinsic_Subprogram (E) - then - null; - - else - -- Entity is local. Mark generic node as unresolved. - -- Note that now it does not have an entity. - - Set_Associated_Node (N, Empty); - Set_Etype (N, Empty); - end if; - - if Nkind (Parent (N)) in N_Generic_Instantiation - and then N = Name (Parent (N)) - then - Save_Global_Defaults (Parent (N), Parent (N2)); - end if; - - elsif Nkind (Parent (N)) = N_Selected_Component - and then Nkind (Parent (N2)) = N_Expanded_Name - then - if Is_Global (Entity (Parent (N2))) then - Change_Selected_Component_To_Expanded_Name (Parent (N)); - Set_Associated_Node (Parent (N), Parent (N2)); - Set_Global_Type (Parent (N), Parent (N2)); - Save_Entity_Descendants (N); - - -- If this is a reference to the current generic entity, - -- replace by the name of the generic homonym of the current - -- package. This is because in an instantiation Par.P.Q will - -- not resolve to the name of the instance, whose enclosing - -- scope is not necessarily Par. We use the generic homonym - -- rather that the name of the generic itself, because it may - -- be hidden by a local declaration. - - elsif In_Open_Scopes (Entity (Parent (N2))) - and then not - Is_Generic_Unit (Top_Ancestor (Entity (Prefix (Parent (N2))))) - then - if Ekind (Entity (Parent (N2))) = E_Generic_Package then - Rewrite (Parent (N), - Make_Identifier (Sloc (N), - Chars => - Chars (Generic_Homonym (Entity (Parent (N2)))))); - else - Rewrite (Parent (N), - Make_Identifier (Sloc (N), - Chars => Chars (Selector_Name (Parent (N2))))); - end if; - end if; - - if Nkind (Parent (Parent (N))) in N_Generic_Instantiation - and then Parent (N) = Name (Parent (Parent (N))) - then - Save_Global_Defaults - (Parent (Parent (N)), Parent (Parent ((N2)))); - end if; - - -- A selected component may denote a static constant that has - -- been folded. Make the same replacement in original tree. - - elsif Nkind (Parent (N)) = N_Selected_Component - and then (Nkind (Parent (N2)) = N_Integer_Literal - or else Nkind (Parent (N2)) = N_Real_Literal) - then - Rewrite (Parent (N), - New_Copy (Parent (N2))); - Set_Analyzed (Parent (N), False); - - -- A selected component may be transformed into a parameterless - -- function call. If the called entity is global, rewrite the - -- node appropriately, i.e. as an extended name for the global - -- entity. - - elsif Nkind (Parent (N)) = N_Selected_Component - and then Nkind (Parent (N2)) = N_Function_Call - and then Is_Global (Entity (Name (Parent (N2)))) - then - Change_Selected_Component_To_Expanded_Name (Parent (N)); - Set_Associated_Node (Parent (N), Name (Parent (N2))); - Set_Global_Type (Parent (N), Name (Parent (N2))); - Save_Entity_Descendants (N); - - else - -- Entity is local. Reset in generic unit, so that node - -- is resolved anew at the point of instantiation. - - Set_Associated_Node (N, Empty); - Set_Etype (N, Empty); - end if; - end Reset_Entity; - - ----------------------------- - -- Save_Entity_Descendants -- - ----------------------------- - - procedure Save_Entity_Descendants (N : Node_Id) is - begin - case Nkind (N) is - when N_Binary_Op => - Save_Global_Descendant (Union_Id (Left_Opnd (N))); - Save_Global_Descendant (Union_Id (Right_Opnd (N))); - - when N_Unary_Op => - Save_Global_Descendant (Union_Id (Right_Opnd (N))); - - when N_Expanded_Name | N_Selected_Component => - Save_Global_Descendant (Union_Id (Prefix (N))); - Save_Global_Descendant (Union_Id (Selector_Name (N))); - - when N_Identifier | N_Character_Literal | N_Operator_Symbol => - null; - - when others => - raise Program_Error; - end case; - end Save_Entity_Descendants; - - -------------------------- - -- Save_Global_Defaults -- - -------------------------- - - procedure Save_Global_Defaults (N1, N2 : Node_Id) is - Loc : constant Source_Ptr := Sloc (N1); - Assoc2 : constant List_Id := Generic_Associations (N2); - Gen_Id : constant Entity_Id := Get_Generic_Entity (N2); - Assoc1 : List_Id; - Act1 : Node_Id; - Act2 : Node_Id; - Def : Node_Id; - Ndec : Node_Id; - Subp : Entity_Id; - Actual : Entity_Id; - - begin - Assoc1 := Generic_Associations (N1); - - if Present (Assoc1) then - Act1 := First (Assoc1); - else - Act1 := Empty; - Set_Generic_Associations (N1, New_List); - Assoc1 := Generic_Associations (N1); - end if; - - if Present (Assoc2) then - Act2 := First (Assoc2); - else - return; - end if; - - while Present (Act1) and then Present (Act2) loop - Next (Act1); - Next (Act2); - end loop; - - -- Find the associations added for default suprograms - - if Present (Act2) then - while Nkind (Act2) /= N_Generic_Association - or else No (Entity (Selector_Name (Act2))) - or else not Is_Overloadable (Entity (Selector_Name (Act2))) - loop - Next (Act2); - end loop; - - -- Add a similar association if the default is global. The - -- renaming declaration for the actual has been analyzed, and - -- its alias is the program it renames. Link the actual in the - -- original generic tree with the node in the analyzed tree. - - while Present (Act2) loop - Subp := Entity (Selector_Name (Act2)); - Def := Explicit_Generic_Actual_Parameter (Act2); - - -- Following test is defence against rubbish errors - - if No (Alias (Subp)) then - return; - end if; - - -- Retrieve the resolved actual from the renaming declaration - -- created for the instantiated formal. - - Actual := Entity (Name (Parent (Parent (Subp)))); - Set_Entity (Def, Actual); - Set_Etype (Def, Etype (Actual)); - - if Is_Global (Actual) then - Ndec := - Make_Generic_Association (Loc, - Selector_Name => New_Occurrence_Of (Subp, Loc), - Explicit_Generic_Actual_Parameter => - New_Occurrence_Of (Actual, Loc)); - - Set_Associated_Node - (Explicit_Generic_Actual_Parameter (Ndec), Def); - - Append (Ndec, Assoc1); - - -- If there are other defaults, add a dummy association - -- in case there are other defaulted formals with the same - -- name. - - elsif Present (Next (Act2)) then - Ndec := - Make_Generic_Association (Loc, - Selector_Name => New_Occurrence_Of (Subp, Loc), - Explicit_Generic_Actual_Parameter => Empty); - - Append (Ndec, Assoc1); - end if; - - Next (Act2); - end loop; - end if; - - if Nkind (Name (N1)) = N_Identifier - and then Is_Child_Unit (Gen_Id) - and then Is_Global (Gen_Id) - and then Is_Generic_Unit (Scope (Gen_Id)) - and then In_Open_Scopes (Scope (Gen_Id)) - then - -- This is an instantiation of a child unit within a sibling, - -- so that the generic parent is in scope. An eventual instance - -- must occur within the scope of an instance of the parent. - -- Make name in instance into an expanded name, to preserve the - -- identifier of the parent, so it can be resolved subsequently. - - Rewrite (Name (N2), - Make_Expanded_Name (Loc, - Chars => Chars (Gen_Id), - Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc), - Selector_Name => New_Occurrence_Of (Gen_Id, Loc))); - Set_Entity (Name (N2), Gen_Id); - - Rewrite (Name (N1), - Make_Expanded_Name (Loc, - Chars => Chars (Gen_Id), - Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc), - Selector_Name => New_Occurrence_Of (Gen_Id, Loc))); - - Set_Associated_Node (Name (N1), Name (N2)); - Set_Associated_Node (Prefix (Name (N1)), Empty); - Set_Associated_Node - (Selector_Name (Name (N1)), Selector_Name (Name (N2))); - Set_Etype (Name (N1), Etype (Gen_Id)); - end if; - - end Save_Global_Defaults; - - ---------------------------- - -- Save_Global_Descendant -- - ---------------------------- - - procedure Save_Global_Descendant (D : Union_Id) is - N1 : Node_Id; - - begin - if D in Node_Range then - if D = Union_Id (Empty) then - null; - - elsif Nkind (Node_Id (D)) /= N_Compilation_Unit then - Save_References (Node_Id (D)); - end if; - - elsif D in List_Range then - if D = Union_Id (No_List) - or else Is_Empty_List (List_Id (D)) - then - null; - - else - N1 := First (List_Id (D)); - while Present (N1) loop - Save_References (N1); - Next (N1); - end loop; - end if; - - -- Element list or other non-node field, nothing to do - - else - null; - end if; - end Save_Global_Descendant; - - --------------------- - -- Save_References -- - --------------------- - - -- This is the recursive procedure that does the work, once the - -- enclosing generic scope has been established. We have to treat - -- specially a number of node rewritings that are required by semantic - -- processing and which change the kind of nodes in the generic copy: - -- typically constant-folding, replacing an operator node by a string - -- literal, or a selected component by an expanded name. In each of - -- those cases, the transformation is propagated to the generic unit. - - procedure Save_References (N : Node_Id) is - begin - if N = Empty then - null; - - elsif Nkind (N) = N_Character_Literal - or else Nkind (N) = N_Operator_Symbol - then - if Nkind (N) = Nkind (Get_Associated_Node (N)) then - Reset_Entity (N); - - elsif Nkind (N) = N_Operator_Symbol - and then Nkind (Get_Associated_Node (N)) = N_String_Literal - then - Change_Operator_Symbol_To_String_Literal (N); - end if; - - elsif Nkind (N) in N_Op then - - if Nkind (N) = Nkind (Get_Associated_Node (N)) then - - if Nkind (N) = N_Op_Concat then - Set_Is_Component_Left_Opnd (N, - Is_Component_Left_Opnd (Get_Associated_Node (N))); - - Set_Is_Component_Right_Opnd (N, - Is_Component_Right_Opnd (Get_Associated_Node (N))); - end if; - - Reset_Entity (N); - else - -- Node may be transformed into call to a user-defined operator - - N2 := Get_Associated_Node (N); - - if Nkind (N2) = N_Function_Call then - E := Entity (Name (N2)); - - if Present (E) - and then Is_Global (E) - then - Set_Etype (N, Etype (N2)); - else - Set_Associated_Node (N, Empty); - Set_Etype (N, Empty); - end if; - - elsif Nkind (N2) = N_Integer_Literal - or else Nkind (N2) = N_Real_Literal - or else Nkind (N2) = N_String_Literal - then - -- Operation was constant-folded, perform the same - -- replacement in generic. - - Rewrite (N, New_Copy (N2)); - Set_Analyzed (N, False); - - elsif Nkind (N2) = N_Identifier - and then Ekind (Entity (N2)) = E_Enumeration_Literal - then - -- Same if call was folded into a literal, but in this - -- case retain the entity to avoid spurious ambiguities - -- if id is overloaded at the point of instantiation or - -- inlining. - - Rewrite (N, New_Copy (N2)); - Set_Analyzed (N, False); - end if; - end if; - - -- Complete the check on operands, if node has not been - -- constant-folded. - - if Nkind (N) in N_Op then - Save_Entity_Descendants (N); - end if; - - elsif Nkind (N) = N_Identifier then - if Nkind (N) = Nkind (Get_Associated_Node (N)) then - - -- If this is a discriminant reference, always save it. - -- It is used in the instance to find the corresponding - -- discriminant positionally rather than by name. - - Set_Original_Discriminant - (N, Original_Discriminant (Get_Associated_Node (N))); - Reset_Entity (N); - - else - N2 := Get_Associated_Node (N); - - if Nkind (N2) = N_Function_Call then - E := Entity (Name (N2)); - - -- Name resolves to a call to parameterless function. - -- If original entity is global, mark node as resolved. - - if Present (E) - and then Is_Global (E) - then - Set_Etype (N, Etype (N2)); - else - Set_Associated_Node (N, Empty); - Set_Etype (N, Empty); - end if; - - elsif - Nkind (N2) = N_Integer_Literal or else - Nkind (N2) = N_Real_Literal or else - Nkind (N2) = N_String_Literal - then - -- Name resolves to named number that is constant-folded, - -- or to string literal from concatenation. - -- Perform the same replacement in generic. - - Rewrite (N, New_Copy (N2)); - Set_Analyzed (N, False); - - elsif Nkind (N2) = N_Explicit_Dereference then - - -- An identifier is rewritten as a dereference if it is - -- the prefix in a selected component, and it denotes an - -- access to a composite type, or a parameterless function - -- call that returns an access type. - - -- Check whether corresponding entity in prefix is global - - if Is_Entity_Name (Prefix (N2)) - and then Present (Entity (Prefix (N2))) - and then Is_Global (Entity (Prefix (N2))) - then - Rewrite (N, - Make_Explicit_Dereference (Sloc (N), - Prefix => Make_Identifier (Sloc (N), - Chars => Chars (N)))); - Set_Associated_Node (Prefix (N), Prefix (N2)); - - elsif Nkind (Prefix (N2)) = N_Function_Call - and then Is_Global (Entity (Name (Prefix (N2)))) - then - Rewrite (N, - Make_Explicit_Dereference (Sloc (N), - Prefix => Make_Function_Call (Sloc (N), - Name => - Make_Identifier (Sloc (N), - Chars => Chars (N))))); - - Set_Associated_Node - (Name (Prefix (N)), Name (Prefix (N2))); - - else - Set_Associated_Node (N, Empty); - Set_Etype (N, Empty); - end if; - - -- The subtype mark of a nominally unconstrained object - -- is rewritten as a subtype indication using the bounds - -- of the expression. Recover the original subtype mark. - - elsif Nkind (N2) = N_Subtype_Indication - and then Is_Entity_Name (Original_Node (N2)) - then - Set_Associated_Node (N, Original_Node (N2)); - Reset_Entity (N); - - else - null; - end if; - end if; - - elsif Nkind (N) in N_Entity then - null; - - else - declare - Loc : constant Source_Ptr := Sloc (N); - Qual : Node_Id := Empty; - Typ : Entity_Id := Empty; - Nam : Node_Id; - - use Atree.Unchecked_Access; - -- This code section is part of implementing an untyped tree - -- traversal, so it needs direct access to node fields. - - begin - if Nkind (N) = N_Aggregate - or else - Nkind (N) = N_Extension_Aggregate - then - N2 := Get_Associated_Node (N); - - if No (N2) then - Typ := Empty; - else - Typ := Etype (N2); - - -- In an instance within a generic, use the name of - -- the actual and not the original generic parameter. - -- If the actual is global in the current generic it - -- must be preserved for its instantiation. - - if Nkind (Parent (Typ)) = N_Subtype_Declaration - and then - Present (Generic_Parent_Type (Parent (Typ))) - then - Typ := Base_Type (Typ); - Set_Etype (N2, Typ); - end if; - end if; - - if No (N2) - or else No (Typ) - or else not Is_Global (Typ) - then - Set_Associated_Node (N, Empty); - - -- If the aggregate is an actual in a call, it has been - -- resolved in the current context, to some local type. - -- The enclosing call may have been disambiguated by - -- the aggregate, and this disambiguation might fail at - -- instantiation time because the type to which the - -- aggregate did resolve is not preserved. In order to - -- preserve some of this information, we wrap the - -- aggregate in a qualified expression, using the id of - -- its type. For further disambiguation we qualify the - -- type name with its scope (if visible) because both - -- id's will have corresponding entities in an instance. - -- This resolves most of the problems with missing type - -- information on aggregates in instances. - - if Nkind (N2) = Nkind (N) - and then - (Nkind (Parent (N2)) = N_Procedure_Call_Statement - or else Nkind (Parent (N2)) = N_Function_Call) - and then Comes_From_Source (Typ) - then - if Is_Immediately_Visible (Scope (Typ)) then - Nam := Make_Selected_Component (Loc, - Prefix => - Make_Identifier (Loc, Chars (Scope (Typ))), - Selector_Name => - Make_Identifier (Loc, Chars (Typ))); - else - Nam := Make_Identifier (Loc, Chars (Typ)); - end if; - - Qual := - Make_Qualified_Expression (Loc, - Subtype_Mark => Nam, - Expression => Relocate_Node (N)); - end if; - end if; - - Save_Global_Descendant (Field1 (N)); - Save_Global_Descendant (Field2 (N)); - Save_Global_Descendant (Field3 (N)); - Save_Global_Descendant (Field5 (N)); - - if Present (Qual) then - Rewrite (N, Qual); - end if; - - -- All other cases than aggregates - - else - Save_Global_Descendant (Field1 (N)); - Save_Global_Descendant (Field2 (N)); - Save_Global_Descendant (Field3 (N)); - Save_Global_Descendant (Field4 (N)); - Save_Global_Descendant (Field5 (N)); - end if; - end; - end if; - end Save_References; - - -- Start of processing for Save_Global_References - - begin - Gen_Scope := Current_Scope; - - -- If the generic unit is a child unit, references to entities in - -- the parent are treated as local, because they will be resolved - -- anew in the context of the instance of the parent. - - while Is_Child_Unit (Gen_Scope) - and then Ekind (Scope (Gen_Scope)) = E_Generic_Package - loop - Gen_Scope := Scope (Gen_Scope); - end loop; - - Save_References (N); - end Save_Global_References; - - -------------------------------------- - -- Set_Copied_Sloc_For_Inlined_Body -- - -------------------------------------- - - procedure Set_Copied_Sloc_For_Inlined_Body (N : Node_Id; E : Entity_Id) is - begin - Create_Instantiation_Source (N, E, True, S_Adjustment); - end Set_Copied_Sloc_For_Inlined_Body; - - --------------------- - -- Set_Instance_Of -- - --------------------- - - procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id) is - begin - Generic_Renamings.Table (Generic_Renamings.Last) := (A, B, Assoc_Null); - Generic_Renamings_HTable.Set (Generic_Renamings.Last); - Generic_Renamings.Increment_Last; - end Set_Instance_Of; - - -------------------- - -- Set_Next_Assoc -- - -------------------- - - procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr) is - begin - Generic_Renamings.Table (E).Next_In_HTable := Next; - end Set_Next_Assoc; - - ------------------- - -- Start_Generic -- - ------------------- - - procedure Start_Generic is - begin - -- ??? I am sure more things could be factored out in this - -- routine. Should probably be done at a later stage. - - Generic_Flags.Increment_Last; - Generic_Flags.Table (Generic_Flags.Last) := Inside_A_Generic; - Inside_A_Generic := True; - - Expander_Mode_Save_And_Set (False); - end Start_Generic; - - ---------------------- - -- Set_Instance_Env -- - ---------------------- - - procedure Set_Instance_Env - (Gen_Unit : Entity_Id; - Act_Unit : Entity_Id) - is - begin - -- Regardless of the current mode, predefined units are analyzed in - -- the most current Ada mode, and earlier version Ada checks do not - -- apply to predefined units. - - -- Why is this not using the routine Opt.Set_Opt_Config_Switches ??? - - if Is_Internal_File_Name - (Fname => Unit_File_Name (Get_Source_Unit (Gen_Unit)), - Renamings_Included => True) then - Ada_Version := Ada_Version_Type'Last; - end if; - - Current_Instantiated_Parent := (Gen_Unit, Act_Unit, Assoc_Null); - end Set_Instance_Env; - - ----------------- - -- Switch_View -- - ----------------- - - procedure Switch_View (T : Entity_Id) is - BT : constant Entity_Id := Base_Type (T); - Priv_Elmt : Elmt_Id := No_Elmt; - Priv_Sub : Entity_Id; - - begin - -- T may be private but its base type may have been exchanged through - -- some other occurrence, in which case there is nothing to switch. - - if not Is_Private_Type (BT) then - return; - end if; - - Priv_Elmt := First_Elmt (Private_Dependents (BT)); - - if Present (Full_View (BT)) then - Prepend_Elmt (Full_View (BT), Exchanged_Views); - Exchange_Declarations (BT); - end if; - - while Present (Priv_Elmt) loop - Priv_Sub := (Node (Priv_Elmt)); - - -- We avoid flipping the subtype if the Etype of its full - -- view is private because this would result in a malformed - -- subtype. This occurs when the Etype of the subtype full - -- view is the full view of the base type (and since the - -- base types were just switched, the subtype is pointing - -- to the wrong view). This is currently the case for - -- tagged record types, access types (maybe more?) and - -- needs to be resolved. ??? - - if Present (Full_View (Priv_Sub)) - and then not Is_Private_Type (Etype (Full_View (Priv_Sub))) - then - Prepend_Elmt (Full_View (Priv_Sub), Exchanged_Views); - Exchange_Declarations (Priv_Sub); - end if; - - Next_Elmt (Priv_Elmt); - end loop; - end Switch_View; - - ----------------------------- - -- Valid_Default_Attribute -- - ----------------------------- - - procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id) is - Attr_Id : constant Attribute_Id := - Get_Attribute_Id (Attribute_Name (Def)); - T : constant Entity_Id := Entity (Prefix (Def)); - Is_Fun : constant Boolean := (Ekind (Nam) = E_Function); - F : Entity_Id; - Num_F : Int; - OK : Boolean; - - begin - if No (T) - or else T = Any_Id - then - return; - end if; - - Num_F := 0; - F := First_Formal (Nam); - while Present (F) loop - Num_F := Num_F + 1; - Next_Formal (F); - end loop; - - case Attr_Id is - when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign | - Attribute_Floor | Attribute_Fraction | Attribute_Machine | - Attribute_Model | Attribute_Remainder | Attribute_Rounding | - Attribute_Unbiased_Rounding => - OK := Is_Fun - and then Num_F = 1 - and then Is_Floating_Point_Type (T); - - when Attribute_Image | Attribute_Pred | Attribute_Succ | - Attribute_Value | Attribute_Wide_Image | - Attribute_Wide_Value => - OK := (Is_Fun and then Num_F = 1 and then Is_Scalar_Type (T)); - - when Attribute_Max | Attribute_Min => - OK := (Is_Fun and then Num_F = 2 and then Is_Scalar_Type (T)); - - when Attribute_Input => - OK := (Is_Fun and then Num_F = 1); - - when Attribute_Output | Attribute_Read | Attribute_Write => - OK := (not Is_Fun and then Num_F = 2); - - when others => - OK := False; - end case; - - if not OK then - Error_Msg_N ("attribute reference has wrong profile for subprogram", - Def); - end if; - end Valid_Default_Attribute; - -end Sem_Ch12; |