diff options
Diffstat (limited to 'gcc-4.2.1/gcc/ada/exp_ch7.ads')
| -rw-r--r-- | gcc-4.2.1/gcc/ada/exp_ch7.ads | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/gcc-4.2.1/gcc/ada/exp_ch7.ads b/gcc-4.2.1/gcc/ada/exp_ch7.ads new file mode 100644 index 000000000..02c380634 --- /dev/null +++ b/gcc-4.2.1/gcc/ada/exp_ch7.ads @@ -0,0 +1,235 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT COMPILER COMPONENTS -- +-- -- +-- E X P _ C H 7 -- +-- -- +-- S p e c -- +-- -- +-- Copyright (C) 1992-2005, 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 Types; use Types; + +package Exp_Ch7 is + + procedure Expand_N_Package_Body (N : Node_Id); + procedure Expand_N_Package_Declaration (N : Node_Id); + + ----------------------------- + -- Finalization Management -- + ----------------------------- + + function In_Finalization_Root (E : Entity_Id) return Boolean; + -- True if current scope is in package System.Finalization_Root. Used + -- to avoid certain expansions that would involve circularity in the + -- Rtsfind mechanism. + + procedure Build_Final_List (N : Node_Id; Typ : Entity_Id); + -- Build finalization list for anonymous access types, and for access + -- types that are frozen before their designated types are known to + -- be controlled. + + procedure Build_Controlling_Procs (Typ : Entity_Id); + -- Typ is a record, and array type having controlled components. + -- Create the procedures Deep_Initialize, Deep_Adjust and Deep_Finalize + -- that take care of finalization management at run-time. + + procedure Build_Late_Proc (Typ : Entity_Id; Nam : Name_Id); + -- Build one controlling procedure when a late body overrides one of + -- the controlling operations. + + function Controller_Component (Typ : Entity_Id) return Entity_Id; + -- Returns the entity of the component whose name is 'Name_uController' + + function Controlled_Type (T : Entity_Id) return Boolean; + -- True if T potentially needs finalization actions + + function Find_Final_List + (E : Entity_Id; + Ref : Node_Id := Empty) return Node_Id; + -- E is an entity representing a controlled object, a controlled type + -- or a scope. If Ref is not empty, it is a reference to a controlled + -- record, the closest Final list is in the controller component of + -- the record containing Ref otherwise this function returns a + -- reference to the final list attached to the closest dynamic scope + -- (that can be E itself) creating this final list if necessary. + + function Has_New_Controlled_Component (E : Entity_Id) return Boolean; + -- E is a type entity. Give the same resul as Has_Controlled_Component + -- except for tagged extensions where the result is True only if the + -- latest extension contains a controlled component. + + function Make_Attach_Call + (Obj_Ref : Node_Id; + Flist_Ref : Node_Id; + With_Attach : Node_Id) return Node_Id; + -- Attach the referenced object to the referenced Final Chain + -- 'Flist_Ref' With_Attach is an expression of type Short_Short_Integer + -- which can be either '0' to signify no attachment, '1' for + -- attachement to a simply linked list or '2' for attachement to a + -- doubly linked list. + + function Make_Init_Call + (Ref : Node_Id; + Typ : Entity_Id; + Flist_Ref : Node_Id; + With_Attach : Node_Id) return List_Id; + -- Ref is an expression (with no-side effect and is not required to + -- have been previously analyzed) that references the object to be + -- initialized. Typ is the expected type of Ref, which is a controlled + -- type (Is_Controlled) or a type with controlled components + -- (Has_Controlled). With_Attach is an integer expression representing + -- the level of attachment, see Attach_To_Final_List's Nb_Link param + -- documentation in s-finimp.ads. + -- + -- This function will generate the appropriate calls to make + -- sure that the objects referenced by Ref are initialized. The + -- generate code is quite different depending on the fact the type + -- IS_Controlled or HAS_Controlled but this is not the problem of the + -- caller, the details are in the body. + + function Make_Adjust_Call + (Ref : Node_Id; + Typ : Entity_Id; + Flist_Ref : Node_Id; + With_Attach : Node_Id; + Allocator : Boolean := False) return List_Id; + -- Ref is an expression (with no-side effect and is not required to + -- have been previously analyzed) that references the object to be + -- adjusted. Typ is the expected type of Ref, which is a controlled + -- type (Is_Controlled) or a type with controlled components + -- (Has_Controlled). With_Attach is an integer expression representing + -- the level of attachment, see Attach_To_Final_List's Nb_Link param + -- documentation in s-finimp.ads. Note: if Typ is Finalize_Storage_Only + -- and the object is at library level, then With_Attach will be ignored, + -- and a zero link level will be passed to Attach_To_Final_List. + -- + -- This function will generate the appropriate calls to make + -- sure that the objects referenced by Ref are adjusted. The generated + -- code is quite different depending on the fact the type IS_Controlled + -- or HAS_Controlled but this is not the problem of the caller, the + -- details are in the body. The objects must be attached when the adjust + -- takes place after an initialization expression but not when it takes + -- place after a regular assignment. + -- + -- If Allocator is True, we are adjusting a newly-created object. The + -- existing chaining pointers should not be left unchanged, because they + -- may come from a bit-for-bit copy of those from an initializing object. + -- So, when this flag is True, if the chaining pointers should otherwise + -- be left unset, instead they are reset to null. + + function Make_Final_Call + (Ref : Node_Id; + Typ : Entity_Id; + With_Detach : Node_Id) return List_Id; + -- Ref is an expression (with no-side effect and is not required + -- to have been previously analyzed) that references the object to + -- be Finalized. Typ is the expected type of Ref, which is a + -- controlled type (Is_Controlled) or a type with controlled + -- components (Has_Controlled). With_Detach is a boolean expression + -- indicating whether to detach the controlled object from whatever + -- finalization list it is currently attached to. + -- + -- This function will generate the appropriate calls to make + -- sure that the objects referenced by Ref are finalized. The generated + -- code is quite different depending on the fact the type IS_Controlled + -- or HAS_Controlled but this is not the problem of the caller, the + -- details are in the body. The objects must be detached when finalizing + -- an unchecked deallocated object but not when finalizing the target of + -- an assignment, it is not necessary either on scope exit. + + procedure Expand_Ctrl_Function_Call (N : Node_Id); + -- Expand a call to a function returning a controlled value. That is to + -- say attach the result of the call to the current finalization list, + -- which is the one of the transient scope created for such constructs. + + -------------------------------------------- + -- Task and Protected Object finalization -- + -------------------------------------------- + + function Cleanup_Array + (N : Node_Id; + Obj : Node_Id; + Typ : Entity_Id) return List_Id; + -- Generate loops to finalize any tasks or simple protected objects + -- that are subcomponents of an array. + + function Cleanup_Protected_Object + (N : Node_Id; + Ref : Node_Id) return Node_Id; + -- Generate code to finalize a protected object without entries + + function Cleanup_Record + (N : Node_Id; + Obj : Node_Id; + Typ : Entity_Id) return List_Id; + -- For each subcomponent of a record that contains tasks or simple + -- protected objects, generate the appropriate finalization call. + + function Cleanup_Task + (N : Node_Id; + Ref : Node_Id) return Node_Id; + -- Generate code to finalize a task + + function Has_Simple_Protected_Object (T : Entity_Id) return Boolean; + -- Check whether composite type contains a simple protected component + + function Is_Simple_Protected_Type (T : Entity_Id) return Boolean; + -- Check whether argument is a protected type without entries. + -- Protected types with entries are controlled, and their cleanup + -- is handled by the standard finalization machinery. For simple + -- protected types we generate inline code to release their locks. + + -------------------------------- + -- Transient Scope Management -- + -------------------------------- + + procedure Expand_Cleanup_Actions (N : Node_Id); + -- Expand the necessary stuff into a scope to enable finalization of local + -- objects and deallocation of transient data when exiting the scope. N is + -- a "scope node" that is to say one of the following: N_Block_Statement, + -- N_Subprogram_Body, N_Task_Body, N_Entry_Body. + + procedure Establish_Transient_Scope (N : Node_Id; Sec_Stack : Boolean); + -- Push a new transient scope on the scope stack. N is the node responsible + -- for the need of a transient scope. If Sec_Stack is True then the + -- secondary stack is brought in, otherwise it isn't. + + function Node_To_Be_Wrapped return Node_Id; + -- return the node to be wrapped if the current scope is transient + + procedure Store_Before_Actions_In_Scope (L : List_Id); + -- Append the list L of actions to the end of the before-actions store + -- in the top of the scope stack + + procedure Store_After_Actions_In_Scope (L : List_Id); + -- Append the list L of actions to the beginning of the after-actions + -- store in the top of the scope stack + + procedure Wrap_Transient_Declaration (N : Node_Id); + -- N is an object declaration. Expand the finalization calls after the + -- declaration and make the outer scope beeing the transient one. + + procedure Wrap_Transient_Expression (N : Node_Id); + -- N is a sub-expression. Expand a transient block around an expression + + procedure Wrap_Transient_Statement (N : Node_Id); + -- N is a statement. Expand a transient block around an instruction + +end Exp_Ch7; |