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-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- S E M _ C H 8 --
--- --
--- S p e c --
--- --
--- $Revision: 1.2.10.2 $
--- --
--- Copyright (C) 1992-2001 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, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, 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);
-
- function Applicable_Use (Pack_Name : Node_Id) return Boolean;
- -- Common code to Use_One_Package and Set_Use, to determine whether
- -- use clause must be processed. Pack_Name is an entity name that
- -- references the package in question.
-
- 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. U 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_Expanded_Name (N : Node_Id);
- -- Selected component is known to be expanded name. Verify legality
- -- of selector given the scope denoted by prefix.
-
- 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, return the entity in the full declaration. Similarly, if
- -- the type is private, it has receivd a full declaration, and we are
- -- in the private part or body of the package, return the full
- -- declaration as well. 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.
-
- function Has_Implicit_Operator (N : Node_Id) return Boolean;
- -- N is an expanded name whose selector is an operator name (eg P."+").
- -- A declarative part contains an implicit declaration of an operator
- -- if it has a declaration of a type to which one of the predefined
- -- operators apply. The existence of this routine is an artifact of
- -- our implementation: a more straightforward but more space-consuming
- -- choice would be to make all inherited operators explicit in the
- -- symbol table.
-
- 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);
- -- 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).
-
- 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).
-
- function Is_Appropriate_For_Record (T : Entity_Id) return Boolean;
- -- Prefix is appropriate for record if it is of a record type, or
- -- an access to such.
-
- function Is_Appropriate_For_Entry_Prefix (T : Entity_Id) return Boolean;
- -- True if it is of a task type, a protected type, or else an access
- -- to one of these types.
-
- 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;
- procedure Save_Scope_Stack;
- -- 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.
-
- procedure Use_One_Package (P : Entity_Id; N : Node_Id);
- -- Make visible entities declarated in package P potentially use-visible
- -- in the current context. Also used in the analysis of subunits, when
- -- re-installing use clauses of parent units. N is the use_clause that
- -- names P (and possibly other packages).
-
- procedure Use_One_Type (Id : Node_Id; N : Node_Id);
- -- Id is the subtype mark from a use type clause. This procedure makes
- -- the primitive operators of the type potentially use-visible.
- -- N is the Use_Type_Clause that names Id.
-
- 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;
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