536 lines
19 KiB
Ada
536 lines
19 KiB
Ada
------------------------------------------------------------------------------
|
|
-- --
|
|
-- GNAT COMPILER COMPONENTS --
|
|
-- --
|
|
-- E X P _ P R A G --
|
|
-- --
|
|
-- B o d y --
|
|
-- --
|
|
-- Copyright (C) 1992-2002 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 Atree; use Atree;
|
|
with Casing; use Casing;
|
|
with Einfo; use Einfo;
|
|
with Errout; use Errout;
|
|
with Exp_Ch11; use Exp_Ch11;
|
|
with Exp_Tss; use Exp_Tss;
|
|
with Exp_Util; use Exp_Util;
|
|
with Expander; use Expander;
|
|
with Namet; use Namet;
|
|
with Nlists; use Nlists;
|
|
with Nmake; use Nmake;
|
|
with Opt; use Opt;
|
|
with Rtsfind; use Rtsfind;
|
|
with Sem; use Sem;
|
|
with Sem_Eval; use Sem_Eval;
|
|
with Sem_Res; use Sem_Res;
|
|
with Sem_Util; use Sem_Util;
|
|
with Sinfo; use Sinfo;
|
|
with Sinput; use Sinput;
|
|
with Snames; use Snames;
|
|
with Stringt; use Stringt;
|
|
with Stand; use Stand;
|
|
with Tbuild; use Tbuild;
|
|
with Uintp; use Uintp;
|
|
|
|
package body Exp_Prag is
|
|
|
|
-----------------------
|
|
-- Local Subprograms --
|
|
-----------------------
|
|
|
|
function Arg1 (N : Node_Id) return Node_Id;
|
|
function Arg2 (N : Node_Id) return Node_Id;
|
|
-- Obtain specified Pragma_Argument_Association
|
|
|
|
procedure Expand_Pragma_Abort_Defer (N : Node_Id);
|
|
procedure Expand_Pragma_Assert (N : Node_Id);
|
|
procedure Expand_Pragma_Import (N : Node_Id);
|
|
procedure Expand_Pragma_Import_Export_Exception (N : Node_Id);
|
|
procedure Expand_Pragma_Inspection_Point (N : Node_Id);
|
|
procedure Expand_Pragma_Interrupt_Priority (N : Node_Id);
|
|
|
|
----------
|
|
-- Arg1 --
|
|
----------
|
|
|
|
function Arg1 (N : Node_Id) return Node_Id is
|
|
begin
|
|
return First (Pragma_Argument_Associations (N));
|
|
end Arg1;
|
|
|
|
----------
|
|
-- Arg2 --
|
|
----------
|
|
|
|
function Arg2 (N : Node_Id) return Node_Id is
|
|
begin
|
|
return Next (Arg1 (N));
|
|
end Arg2;
|
|
|
|
---------------------
|
|
-- Expand_N_Pragma --
|
|
---------------------
|
|
|
|
procedure Expand_N_Pragma (N : Node_Id) is
|
|
begin
|
|
-- Note: we may have a pragma whose chars field is not a
|
|
-- recognized pragma, and we must ignore it at this stage.
|
|
|
|
if Is_Pragma_Name (Chars (N)) then
|
|
case Get_Pragma_Id (Chars (N)) is
|
|
|
|
-- Pragmas requiring special expander action
|
|
|
|
when Pragma_Abort_Defer =>
|
|
Expand_Pragma_Abort_Defer (N);
|
|
|
|
when Pragma_Assert =>
|
|
Expand_Pragma_Assert (N);
|
|
|
|
when Pragma_Export_Exception =>
|
|
Expand_Pragma_Import_Export_Exception (N);
|
|
|
|
when Pragma_Import =>
|
|
Expand_Pragma_Import (N);
|
|
|
|
when Pragma_Import_Exception =>
|
|
Expand_Pragma_Import_Export_Exception (N);
|
|
|
|
when Pragma_Inspection_Point =>
|
|
Expand_Pragma_Inspection_Point (N);
|
|
|
|
when Pragma_Interrupt_Priority =>
|
|
Expand_Pragma_Interrupt_Priority (N);
|
|
|
|
-- All other pragmas need no expander action
|
|
|
|
when others => null;
|
|
end case;
|
|
end if;
|
|
|
|
end Expand_N_Pragma;
|
|
|
|
-------------------------------
|
|
-- Expand_Pragma_Abort_Defer --
|
|
-------------------------------
|
|
|
|
-- An Abort_Defer pragma appears as the first statement in a handled
|
|
-- statement sequence (right after the begin). It defers aborts for
|
|
-- the entire statement sequence, but not for any declarations or
|
|
-- handlers (if any) associated with this statement sequence.
|
|
|
|
-- The transformation is to transform
|
|
|
|
-- pragma Abort_Defer;
|
|
-- statements;
|
|
|
|
-- into
|
|
|
|
-- begin
|
|
-- Abort_Defer.all;
|
|
-- statements
|
|
-- exception
|
|
-- when all others =>
|
|
-- Abort_Undefer.all;
|
|
-- raise;
|
|
-- at end
|
|
-- Abort_Undefer_Direct;
|
|
-- end;
|
|
|
|
procedure Expand_Pragma_Abort_Defer (N : Node_Id) is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Stm : Node_Id;
|
|
Stms : List_Id;
|
|
HSS : Node_Id;
|
|
Blk : constant Entity_Id :=
|
|
New_Internal_Entity (E_Block, Current_Scope, Sloc (N), 'B');
|
|
|
|
begin
|
|
Stms := New_List (Build_Runtime_Call (Loc, RE_Abort_Defer));
|
|
|
|
loop
|
|
Stm := Remove_Next (N);
|
|
exit when No (Stm);
|
|
Append (Stm, Stms);
|
|
end loop;
|
|
|
|
HSS :=
|
|
Make_Handled_Sequence_Of_Statements (Loc,
|
|
Statements => Stms,
|
|
At_End_Proc =>
|
|
New_Occurrence_Of (RTE (RE_Abort_Undefer_Direct), Loc));
|
|
|
|
Rewrite (N,
|
|
Make_Block_Statement (Loc,
|
|
Handled_Statement_Sequence => HSS));
|
|
|
|
Set_Scope (Blk, Current_Scope);
|
|
Set_Etype (Blk, Standard_Void_Type);
|
|
Set_Identifier (N, New_Occurrence_Of (Blk, Sloc (N)));
|
|
Expand_At_End_Handler (HSS, Blk);
|
|
Analyze (N);
|
|
end Expand_Pragma_Abort_Defer;
|
|
|
|
--------------------------
|
|
-- Expand_Pragma_Assert --
|
|
--------------------------
|
|
|
|
procedure Expand_Pragma_Assert (N : Node_Id) is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
Cond : constant Node_Id := Expression (Arg1 (N));
|
|
Msg : String_Id;
|
|
|
|
begin
|
|
-- We already know that assertions are enabled, because otherwise
|
|
-- the semantic pass dealt with rewriting the assertion (see Sem_Prag)
|
|
|
|
pragma Assert (Assertions_Enabled);
|
|
|
|
-- Since assertions are on, we rewrite the pragma with its
|
|
-- corresponding if statement, and then analyze the statement
|
|
-- The expansion transforms:
|
|
|
|
-- pragma Assert (condition [,message]);
|
|
|
|
-- into
|
|
|
|
-- if not condition then
|
|
-- System.Assertions.Raise_Assert_Failure (Str);
|
|
-- end if;
|
|
|
|
-- where Str is the message if one is present, or the default of
|
|
-- file:line if no message is given.
|
|
|
|
-- First, we need to prepare the character literal
|
|
|
|
if Present (Arg2 (N)) then
|
|
Msg := Strval (Expr_Value_S (Expression (Arg2 (N))));
|
|
else
|
|
Build_Location_String (Loc);
|
|
Msg := String_From_Name_Buffer;
|
|
end if;
|
|
|
|
-- Now generate the if statement. Note that we consider this to be
|
|
-- an explicit conditional in the source, not an implicit if, so we
|
|
-- do not call Make_Implicit_If_Statement.
|
|
|
|
Rewrite (N,
|
|
Make_If_Statement (Loc,
|
|
Condition =>
|
|
Make_Op_Not (Loc,
|
|
Right_Opnd => Cond),
|
|
Then_Statements => New_List (
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name =>
|
|
New_Reference_To (RTE (RE_Raise_Assert_Failure), Loc),
|
|
Parameter_Associations => New_List (
|
|
Make_String_Literal (Loc, Msg))))));
|
|
|
|
Analyze (N);
|
|
|
|
-- If new condition is always false, give a warning
|
|
|
|
if Nkind (N) = N_Procedure_Call_Statement
|
|
and then Is_RTE (Entity (Name (N)), RE_Raise_Assert_Failure)
|
|
then
|
|
-- If original condition was a Standard.False, we assume
|
|
-- that this is indeed intented to raise assert error
|
|
-- and no warning is required.
|
|
|
|
if Is_Entity_Name (Original_Node (Cond))
|
|
and then Entity (Original_Node (Cond)) = Standard_False
|
|
then
|
|
return;
|
|
else
|
|
Error_Msg_N ("?assertion will fail at run-time", N);
|
|
end if;
|
|
end if;
|
|
end Expand_Pragma_Assert;
|
|
|
|
--------------------------
|
|
-- Expand_Pragma_Import --
|
|
--------------------------
|
|
|
|
-- When applied to a variable, the default initialization must not be
|
|
-- done. As it is already done when the pragma is found, we just get rid
|
|
-- of the call the initialization procedure which followed the object
|
|
-- declaration.
|
|
|
|
-- We can't use the freezing mechanism for this purpose, since we
|
|
-- have to elaborate the initialization expression when it is first
|
|
-- seen (i.e. this elaboration cannot be deferred to the freeze point).
|
|
|
|
procedure Expand_Pragma_Import (N : Node_Id) is
|
|
Def_Id : constant Entity_Id := Entity (Expression (Arg2 (N)));
|
|
Typ : Entity_Id;
|
|
After_Def : Node_Id;
|
|
|
|
begin
|
|
if Ekind (Def_Id) = E_Variable then
|
|
Typ := Etype (Def_Id);
|
|
After_Def := Next (Parent (Def_Id));
|
|
|
|
if Has_Non_Null_Base_Init_Proc (Typ)
|
|
and then Nkind (After_Def) = N_Procedure_Call_Statement
|
|
and then Is_Entity_Name (Name (After_Def))
|
|
and then Entity (Name (After_Def)) = Base_Init_Proc (Typ)
|
|
then
|
|
Remove (After_Def);
|
|
|
|
elsif Is_Access_Type (Typ) then
|
|
Set_Expression (Parent (Def_Id), Empty);
|
|
end if;
|
|
end if;
|
|
end Expand_Pragma_Import;
|
|
|
|
-------------------------------------------
|
|
-- Expand_Pragma_Import_Export_Exception --
|
|
-------------------------------------------
|
|
|
|
-- For a VMS exception fix up the language field with "VMS"
|
|
-- instead of "Ada" (gigi needs this), create a constant that will be the
|
|
-- value of the VMS condition code and stuff the Interface_Name field
|
|
-- with the unexpanded name of the exception (if not already set).
|
|
-- For a Ada exception, just stuff the Interface_Name field
|
|
-- with the unexpanded name of the exception (if not already set).
|
|
|
|
procedure Expand_Pragma_Import_Export_Exception (N : Node_Id) is
|
|
Id : constant Entity_Id := Entity (Expression (Arg1 (N)));
|
|
Call : constant Node_Id := Register_Exception_Call (Id);
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
begin
|
|
if Present (Call) then
|
|
declare
|
|
Excep_Internal : constant Node_Id :=
|
|
Make_Defining_Identifier
|
|
(Loc, New_Internal_Name ('V'));
|
|
Export_Pragma : Node_Id;
|
|
Excep_Alias : Node_Id;
|
|
Excep_Object : Node_Id;
|
|
Excep_Image : String_Id;
|
|
Exdata : List_Id;
|
|
Lang1 : Node_Id;
|
|
Lang2 : Node_Id;
|
|
Lang3 : Node_Id;
|
|
Code : Node_Id;
|
|
begin
|
|
if Present (Interface_Name (Id)) then
|
|
Excep_Image := Strval (Interface_Name (Id));
|
|
else
|
|
Get_Name_String (Chars (Id));
|
|
Set_All_Upper_Case;
|
|
Excep_Image := String_From_Name_Buffer;
|
|
end if;
|
|
|
|
Exdata := Component_Associations (Expression (Parent (Id)));
|
|
|
|
if Is_VMS_Exception (Id) then
|
|
|
|
Lang1 := Next (First (Exdata));
|
|
Lang2 := Next (Lang1);
|
|
Lang3 := Next (Lang2);
|
|
|
|
Rewrite (Expression (Lang1),
|
|
Make_Character_Literal (Loc, Name_uV, Get_Char_Code ('V')));
|
|
Analyze (Expression (Lang1));
|
|
|
|
Rewrite (Expression (Lang2),
|
|
Make_Character_Literal (Loc, Name_uM, Get_Char_Code ('M')));
|
|
Analyze (Expression (Lang2));
|
|
|
|
Rewrite (Expression (Lang3),
|
|
Make_Character_Literal (Loc, Name_uS, Get_Char_Code ('S')));
|
|
Analyze (Expression (Lang3));
|
|
|
|
if Exception_Code (Id) /= No_Uint then
|
|
Code := Make_Integer_Literal (Loc, Exception_Code (Id));
|
|
|
|
Excep_Object :=
|
|
Make_Object_Declaration (Loc,
|
|
Defining_Identifier => Excep_Internal,
|
|
Object_Definition =>
|
|
New_Reference_To (Standard_Integer, Loc));
|
|
|
|
Insert_Action (N, Excep_Object);
|
|
Analyze (Excep_Object);
|
|
|
|
Start_String;
|
|
Store_String_Int (UI_To_Int (Exception_Code (Id)) / 8 * 8);
|
|
|
|
Excep_Alias :=
|
|
Make_Pragma
|
|
(Loc,
|
|
Name_Linker_Alias,
|
|
New_List
|
|
(Make_Pragma_Argument_Association
|
|
(Sloc => Loc,
|
|
Expression =>
|
|
New_Reference_To (Excep_Internal, Loc)),
|
|
Make_Pragma_Argument_Association
|
|
(Sloc => Loc,
|
|
Expression =>
|
|
Make_String_Literal
|
|
(Sloc => Loc,
|
|
Strval => End_String))));
|
|
|
|
Insert_Action (N, Excep_Alias);
|
|
Analyze (Excep_Alias);
|
|
|
|
Export_Pragma :=
|
|
Make_Pragma
|
|
(Loc,
|
|
Name_Export,
|
|
New_List
|
|
(Make_Pragma_Argument_Association
|
|
(Sloc => Loc,
|
|
Expression => Make_Identifier (Loc, Name_C)),
|
|
Make_Pragma_Argument_Association
|
|
(Sloc => Loc,
|
|
Expression =>
|
|
New_Reference_To (Excep_Internal, Loc)),
|
|
Make_Pragma_Argument_Association
|
|
(Sloc => Loc,
|
|
Expression =>
|
|
Make_String_Literal
|
|
(Sloc => Loc,
|
|
Strval => Excep_Image)),
|
|
Make_Pragma_Argument_Association
|
|
(Sloc => Loc,
|
|
Expression =>
|
|
Make_String_Literal
|
|
(Sloc => Loc,
|
|
Strval => Excep_Image))));
|
|
|
|
Insert_Action (N, Export_Pragma);
|
|
Analyze (Export_Pragma);
|
|
|
|
else
|
|
Code :=
|
|
Unchecked_Convert_To (Standard_Integer,
|
|
Make_Function_Call (Loc,
|
|
Name =>
|
|
New_Reference_To (RTE (RE_Import_Value), Loc),
|
|
Parameter_Associations => New_List
|
|
(Make_String_Literal (Loc,
|
|
Strval => Excep_Image))));
|
|
end if;
|
|
|
|
Rewrite (Call,
|
|
Make_Procedure_Call_Statement (Loc,
|
|
Name => New_Reference_To
|
|
(RTE (RE_Register_VMS_Exception), Loc),
|
|
Parameter_Associations => New_List (Code)));
|
|
|
|
Analyze_And_Resolve (Code, Standard_Integer);
|
|
Analyze (Call);
|
|
|
|
end if;
|
|
|
|
if not Present (Interface_Name (Id)) then
|
|
Set_Interface_Name (Id,
|
|
Make_String_Literal
|
|
(Sloc => Loc,
|
|
Strval => Excep_Image));
|
|
end if;
|
|
end;
|
|
end if;
|
|
end Expand_Pragma_Import_Export_Exception;
|
|
|
|
------------------------------------
|
|
-- Expand_Pragma_Inspection_Point --
|
|
------------------------------------
|
|
|
|
-- If no argument is given, then we supply a default argument list that
|
|
-- includes all objects declared at the source level in all subprograms
|
|
-- that enclose the inspection point pragma.
|
|
|
|
procedure Expand_Pragma_Inspection_Point (N : Node_Id) is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
A : List_Id;
|
|
Assoc : Node_Id;
|
|
S : Entity_Id;
|
|
E : Entity_Id;
|
|
|
|
begin
|
|
if No (Pragma_Argument_Associations (N)) then
|
|
A := New_List;
|
|
S := Current_Scope;
|
|
|
|
while S /= Standard_Standard loop
|
|
E := First_Entity (S);
|
|
while Present (E) loop
|
|
if Comes_From_Source (E)
|
|
and then Is_Object (E)
|
|
and then not Is_Entry_Formal (E)
|
|
and then Ekind (E) /= E_Component
|
|
and then Ekind (E) /= E_Discriminant
|
|
and then Ekind (E) /= E_Generic_In_Parameter
|
|
and then Ekind (E) /= E_Generic_In_Out_Parameter
|
|
then
|
|
Append_To (A,
|
|
Make_Pragma_Argument_Association (Loc,
|
|
Expression => New_Occurrence_Of (E, Loc)));
|
|
end if;
|
|
|
|
Next_Entity (E);
|
|
end loop;
|
|
|
|
S := Scope (S);
|
|
end loop;
|
|
|
|
Set_Pragma_Argument_Associations (N, A);
|
|
end if;
|
|
|
|
-- Expand the arguments of the pragma. Expanding an entity reference
|
|
-- is a noop, except in a protected operation, where a reference may
|
|
-- have to be transformed into a reference to the corresponding prival.
|
|
-- Are there other pragmas that may require this ???
|
|
|
|
Assoc := First (Pragma_Argument_Associations (N));
|
|
|
|
while Present (Assoc) loop
|
|
Expand (Expression (Assoc));
|
|
Next (Assoc);
|
|
end loop;
|
|
end Expand_Pragma_Inspection_Point;
|
|
|
|
--------------------------------------
|
|
-- Expand_Pragma_Interrupt_Priority --
|
|
--------------------------------------
|
|
|
|
-- Supply default argument if none exists (System.Interrupt_Priority'Last)
|
|
|
|
procedure Expand_Pragma_Interrupt_Priority (N : Node_Id) is
|
|
Loc : constant Source_Ptr := Sloc (N);
|
|
|
|
begin
|
|
if No (Pragma_Argument_Associations (N)) then
|
|
Set_Pragma_Argument_Associations (N, New_List (
|
|
Make_Pragma_Argument_Association (Loc,
|
|
Expression =>
|
|
Make_Attribute_Reference (Loc,
|
|
Prefix =>
|
|
New_Occurrence_Of (RTE (RE_Interrupt_Priority), Loc),
|
|
Attribute_Name => Name_Last))));
|
|
end if;
|
|
end Expand_Pragma_Interrupt_Priority;
|
|
|
|
end Exp_Prag;
|