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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- E X P _ C H 1 1 --
-- --
-- B o d y --
-- --
-- $Revision: 1.12 $ --
-- --
-- Copyright (C) 1992-1997 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 Atree; use Atree;
with Einfo; use Einfo;
with Exp_Ch7; use Exp_Ch7;
with Exp_Util; use Exp_Util;
with Sinfo; use Sinfo;
with Sem; use Sem;
with Sem_Res; use Sem_Res;
with Sem_Util; use Sem_Util;
with Snames; use Snames;
with Stand; use Stand;
with Nlists; use Nlists;
with Nmake; use Nmake;
with Tbuild; use Tbuild;
with Rtsfind; use Rtsfind;
with Uintp; use Uintp;
package body Exp_Ch11 is
---------------------------------------------
-- Expand_N_Handled_Sequence_Of_Statements --
---------------------------------------------
procedure Expand_N_Handled_Sequence_Of_Statements (N : Node_Id) is
Loc : Source_Ptr;
Undefer : Node_Id;
Handler : Node_Id;
Handlers : constant List_Id := Exception_Handlers (N);
begin
-- Add a call to Abort_Undefer to the front of all exception handlers.
-- Abortion is deferred as part of raising an exception, to prevent
-- cleanup activities from being aborted.
if Present (Handlers) then
Handler := First_Non_Pragma (Handlers);
while Present (Handler) loop
Loc := Sloc (Handler);
Undefer :=
Make_Procedure_Call_Statement (Loc,
Name =>
New_Reference_To (RTE (RE_Abort_Undefer), Loc),
Parameter_Associations => Empty_List);
Prepend_To (Statements (Handler), Undefer);
Analyze (Undefer);
Handler := Next_Non_Pragma (Handler);
end loop;
end if;
-- The following code needs commenting ???
if Nkind (Parent (N)) /= N_Package_Body
and then Nkind (Parent (N)) /= N_Accept_Statement
and then not Has_Pending_Instantiations (Current_Scope)
then
Expand_Cleanup_Actions (Parent (N));
else
Set_First_Real_Statement (N, First (Statements (N)));
end if;
end Expand_N_Handled_Sequence_Of_Statements;
------------------------------------
-- Expand_N_Exception_Declaration --
------------------------------------
-- Generates:
-- exceptE : constant String := "A.B.EXCEP"; -- static data
-- except : exception_data := (
-- Handled_By_Other => False,
-- C1 => 'A',
-- C2 => 'd',
-- C3 => 'a',
-- Name_Length => exceptE'Length
-- Full_Name => exceptE'Address
-- HTable_Ptr => null);
-- (protecting test only needed if not at library level)
--
-- exceptF : Boolean := True -- static data
-- if exceptF then
-- exceptF := False;
-- Register_Exception (except'Unchecked_Access);
-- end if;
procedure Expand_N_Exception_Declaration (N : Node_Id) is
Loc : constant Source_Ptr := Sloc (N);
Id : constant Entity_Id := Defining_Identifier (N);
L : List_Id := New_List;
Flag_Id : Entity_Id;
Name_Exname : constant Name_Id := New_External_Name (Chars (Id), 'E');
Exname : constant Node_Id :=
Make_Defining_Identifier (Loc, Name_Exname);
begin
-- Definition of the external name: nam : constant String := "A.B.NAME";
Insert_Action (N,
Make_Object_Declaration (Loc,
Defining_Identifier => Exname,
Constant_Present => True,
Object_Definition => New_Reference_To (Standard_String, Loc),
Expression => Make_String_Literal (Loc, Full_Qualified_Name (Id))));
Set_Is_Statically_Allocated (Exname);
-- Create the aggregate list for type Standard.Exception_Type:
-- Handled_By_Other component: False
Append_To (L, New_Reference_To (Standard_False, Loc));
-- C1 component: 'A'
Append_To (L,
Make_Character_Literal (Loc, Name_uA, Get_Char_Code ('A')));
-- C2 component: 'd'
Append_To (L,
Make_Character_Literal (Loc, Name_D, Get_Char_Code ('d')));
-- C3 component: 'a'
Append_To (L,
Make_Character_Literal (Loc, Name_A, Get_Char_Code ('a')));
-- Name_Length component: Nam'Length
Append_To (L,
Make_Attribute_Reference (Loc,
Prefix => New_Reference_To (Exname, Loc),
Attribute_Name => Name_Length));
-- Full_Name component: Standard.A_Char!(Nam'Address)
Append_To (L, Unchecked_Convert_To (Standard_A_Char,
Make_Attribute_Reference (Loc,
Prefix => New_Reference_To (Exname, Loc),
Attribute_Name => Name_Address)));
-- HTable_Ptr component: null
Append_To (L, Make_Null (Loc));
Set_Expression (N, Make_Aggregate (Loc, Expressions => L));
Analyze_And_Resolve (Expression (N), Etype (Id));
-- Register_Exception (except'Unchecked_Access);
L := New_List (
Make_Procedure_Call_Statement (Loc,
Name => New_Reference_To (RTE (RE_Register_Exception), Loc),
Parameter_Associations => New_List (
Unchecked_Convert_To (RTE (RE_Exception_Data_Ptr),
Make_Attribute_Reference (Loc,
Prefix => New_Reference_To (Id, Loc),
Attribute_Name => Name_Unrestricted_Access)))));
if not Is_Library_Level_Entity (Id) then
Flag_Id := Make_Defining_Identifier (Loc,
New_External_Name (Chars (Id), 'F'));
Insert_Action (N,
Make_Object_Declaration (Loc,
Defining_Identifier => Flag_Id,
Object_Definition => New_Reference_To (Standard_Boolean, Loc),
Expression => New_Reference_To (Standard_True, Loc)));
Set_Is_Statically_Allocated (Flag_Id);
Append_To (L,
Make_Assignment_Statement (Loc,
Name => New_Reference_To (Flag_Id, Loc),
Expression => New_Reference_To (Standard_False, Loc)));
Insert_After_And_Analyze (N,
Make_If_Statement (Loc,
Condition => New_Reference_To (Flag_Id, Loc),
Then_Statements => L));
else
Insert_List_After_And_Analyze (N, L);
end if;
end Expand_N_Exception_Declaration;
end Exp_Ch11;
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