New Language: Ada

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@45959 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 190 insertions, 0 deletions

diff --git a/gcc/ada/sem_ch8.ads b/gcc/ada/sem_ch8.ads
new file mode 100644
index 00000000000..c2713657a4a
--- /dev/null
+++ b/gcc/ada/sem_ch8.ads
@@ -0,0 +1,190 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--                              S E M _ C H 8                               --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--                            $Revision: 1.33 $                             --
+--                                                                          --
+--          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. --
+-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
+--                                                                          --
+------------------------------------------------------------------------------
+
+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 sucessfully 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;