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Diffstat (limited to 'gcc-4.2.1/gcc/ada/sem_ch8.ads')
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1 files changed, 160 insertions, 0 deletions
diff --git a/gcc-4.2.1/gcc/ada/sem_ch8.ads b/gcc-4.2.1/gcc/ada/sem_ch8.ads new file mode 100644 index 000000000..1439a8886 --- /dev/null +++ b/gcc-4.2.1/gcc/ada/sem_ch8.ads @@ -0,0 +1,160 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT COMPILER COMPONENTS -- +-- -- +-- S E M _ C H 8 -- +-- -- +-- S p e c -- +-- -- +-- Copyright (C) 1992-2004 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 Sem_Ch8 is + + ----------------------------------- + -- Handling extensions of System -- + ----------------------------------- + + -- For targets that define a much larger System package than given in + -- the RM, we use a child package containing additional declarations, + -- which is loaded when needed, and whose entities are conceptually + -- within System itself. The presence of this auxiliary package is + -- controlled with the pragma Extend_System. The following variable + -- holds the entity of the auxiliary package, to simplify the special + -- visibility rules that apply to it. + + System_Aux_Id : Entity_Id := Empty; + + ----------------- + -- Subprograms -- + ----------------- + + procedure Analyze_Exception_Renaming (N : Node_Id); + procedure Analyze_Expanded_Name (N : Node_Id); + procedure Analyze_Generic_Function_Renaming (N : Node_Id); + procedure Analyze_Generic_Package_Renaming (N : Node_Id); + procedure Analyze_Generic_Procedure_Renaming (N : Node_Id); + procedure Analyze_Object_Renaming (N : Node_Id); + procedure Analyze_Package_Renaming (N : Node_Id); + procedure Analyze_Subprogram_Renaming (N : Node_Id); + procedure Analyze_Use_Package (N : Node_Id); + procedure Analyze_Use_Type (N : Node_Id); + + procedure End_Scope; + -- Called at end of scope. On exit from blocks and bodies (subprogram, + -- package, task, and protected bodies), the name of the current scope + -- must be removed from the scope stack, and the local entities must be + -- removed from their homonym chains. On exit from record declarations, + -- from package specifications, and from tasks and protected type + -- specifications, more specialized procedures are invoked. + + procedure End_Use_Clauses (Clause : Node_Id); + -- Invoked on scope exit, to undo the effect of local use clauses. Clause + -- is the first use-clause of a scope being exited. This can be the current + -- scope, or some enclosing scopes when building a clean environment to + -- compile an instance body for inlining. + + procedure End_Use_Package (N : Node_Id); + procedure End_Use_Type (N : Node_Id); + -- Subsidiaries of End_Use_Clauses. Also called directly for use clauses + -- appearing in context clauses. + + procedure Find_Direct_Name (N : Node_Id); + -- Given a direct name (Identifier or Operator_Symbol), this routine + -- scans the homonym chain for the name searching for corresponding + -- visible entities to find the referenced entity (or in the case of + -- overloading), entities. On return, the Entity, and Etype fields + -- are set. In the non-overloaded case, these are the correct final + -- entries. In the overloaded case, Is_Overloaded is set, Etype and + -- Entity refer to an arbitrary element of the overloads set, and + -- an appropriate list of entries has been made in the overload + -- interpretation table (to be disambiguated in the resolve phase). + + procedure Find_Selected_Component (N : Node_Id); + -- Resolve various cases of selected components, recognize expanded names + + procedure Find_Type (N : Node_Id); + -- Perform name resolution, and verify that the name found is that of a + -- type. On return the Entity and Etype fields of the node N are set + -- appropriately. If it is an incomplete type whose full declaration has + -- been seen, they are set to the entity in the full declaration. + -- Similarly, if the type is private, it has received a full declaration, + -- and we are in the private part or body of the package, then the two + -- fields are set to the entity of the full declaration as well. This + -- procedure also provides special processing for Class types as well. + + function Get_Full_View (T_Name : Entity_Id) return Entity_Id; + -- If T_Name is an incomplete type and the full declaration has been + -- seen, or is the name of a class_wide type whose root is incomplete. + -- return the corresponding full declaration. + + procedure Initialize; + -- Initializes data structures used for visibility analysis. Must be + -- called before analyzing each new main source program. + + procedure Install_Use_Clauses + (Clause : Node_Id; + Force_Installation : Boolean := False); + -- Applies the use clauses appearing in a given declarative part, + -- when the corresponding scope has been placed back on the scope + -- stack after unstacking to compile a different context (subunit or + -- parent of generic body). Force_Installation is used when called from + -- Analyze_Subunit.Re_Install_Use_Clauses to insure that, after the + -- analysis of the subunit, the parent's environment is again identical. + + function In_Open_Scopes (S : Entity_Id) return Boolean; + -- S is the entity of a scope. This function determines if this scope + -- is currently open (i.e. it appears somewhere in the scope stack). + + procedure New_Scope (S : Entity_Id); + -- Make new scope stack entry, pushing S, the entity for a scope + -- onto the top of the scope table. The current setting of the scope + -- suppress flags is saved for restoration on exit. + + procedure Pop_Scope; + -- Remove top entry from scope stack, restoring the saved setting + -- of the scope suppress flags. + + function Present_System_Aux (N : Node_Id := Empty) return Boolean; + -- Return True if the auxiliary system file has been successfully loaded. + -- Otherwise attempt to load it, using the name supplied by a previous + -- Extend_System pragma, and report on the success of the load. + -- If N is present, it is a selected component whose prefix is System, + -- or else a with-clause on system. N is absent when the function is + -- called to find the visibility of implicit operators. + + procedure Restore_Scope_Stack (Handle_Use : Boolean := True); + procedure Save_Scope_Stack (Handle_Use : Boolean := True); + -- These two procedures are called from Semantics, when a unit U1 is + -- to be compiled in the course of the compilation of another unit U2. + -- This happens whenever Rtsfind is called. U1, the unit retrieved by + -- Rtsfind, must be compiled in its own context, and the current scope + -- stack containing U2 and local scopes must be made unreachable. On + -- return, the contents of the scope stack must be made accessible again. + -- The flag Handle_Use indicates whether local use clauses must be + -- removed/installed. In the case of inlining of instance bodies, the + -- visiblity handling is done fully in Inline_Instance_Body, and use + -- clauses are handled there. + + procedure Set_Use (L : List_Id); + -- Find use clauses that are declarative items in a package declaration + -- and set the potentially use-visible flags of imported entities before + -- analyzing the corresponding package body. + +end Sem_Ch8; |