-- --
-- B o d y --
-- --
--- $Revision$
--- --
--- Copyright (C) 1992-2002 Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2007, 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- --
-- 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. --
+-- 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. --
--- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
with Atree; use Atree;
with Casing; use Casing;
+with Debug; use Debug;
with Einfo; use Einfo;
with Errout; use Errout;
with Exp_Ch11; use Exp_Ch11;
with Nlists; use Nlists;
with Nmake; use Nmake;
with Opt; use Opt;
+with Restrict; use Restrict;
+with Rident; use Rident;
with Rtsfind; use Rtsfind;
with Sem; use Sem;
with Sem_Eval; use Sem_Eval;
with Snames; use Snames;
with Stringt; use Stringt;
with Stand; use Stand;
+with Targparm; use Targparm;
with Tbuild; use Tbuild;
with Uintp; use Uintp;
function Arg1 (N : Node_Id) return Node_Id;
function Arg2 (N : Node_Id) return Node_Id;
- -- Obtain specified Pragma_Argument_Association
+ -- Obtain specified pragma argument expression
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_Common_Object (N : Node_Id);
+ procedure Expand_Pragma_Import_Or_Interface (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);
+ procedure Expand_Pragma_Psect_Object (N : Node_Id);
----------
-- Arg1 --
----------
function Arg1 (N : Node_Id) return Node_Id is
+ Arg : constant Node_Id := First (Pragma_Argument_Associations (N));
begin
- return First (Pragma_Argument_Associations (N));
+ if Present (Arg)
+ and then Nkind (Arg) = N_Pragma_Argument_Association
+ then
+ return Expression (Arg);
+ else
+ return Arg;
+ end if;
end Arg1;
----------
----------
function Arg2 (N : Node_Id) return Node_Id is
+ Arg1 : constant Node_Id := First (Pragma_Argument_Associations (N));
begin
- return Next (Arg1 (N));
+ if No (Arg1) then
+ return Empty;
+ else
+ declare
+ Arg : constant Node_Id := Next (Arg1);
+ begin
+ if Present (Arg)
+ and then Nkind (Arg) = N_Pragma_Argument_Association
+ then
+ return Expression (Arg);
+ else
+ return Arg;
+ end if;
+ end;
+ end if;
end Arg2;
---------------------
when Pragma_Assert =>
Expand_Pragma_Assert (N);
+ when Pragma_Common_Object =>
+ Expand_Pragma_Common_Object (N);
+
when Pragma_Export_Exception =>
Expand_Pragma_Import_Export_Exception (N);
when Pragma_Import =>
- Expand_Pragma_Import (N);
+ Expand_Pragma_Import_Or_Interface (N);
when Pragma_Import_Exception =>
Expand_Pragma_Import_Export_Exception (N);
when Pragma_Inspection_Point =>
Expand_Pragma_Inspection_Point (N);
+ when Pragma_Interface =>
+ Expand_Pragma_Import_Or_Interface (N);
+
when Pragma_Interrupt_Priority =>
Expand_Pragma_Interrupt_Priority (N);
+ when Pragma_Psect_Object =>
+ Expand_Pragma_Psect_Object (N);
+
-- All other pragmas need no expander action
when others => null;
procedure Expand_Pragma_Assert (N : Node_Id) is
Loc : constant Source_Ptr := Sloc (N);
- Cond : constant Node_Id := Expression (Arg1 (N));
+ Cond : constant Node_Id := Arg1 (N);
Msg : String_Id;
begin
-- Since assertions are on, we rewrite the pragma with its
-- corresponding if statement, and then analyze the statement
- -- The expansion transforms:
+ -- The normal case expansion transforms:
-- pragma Assert (condition [,message]);
-- 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
+ -- An alternative expansion is used when the No_Exception_Propagation
+ -- restriction is active and there is a local Assert_Failure handler.
+ -- This is not a common combination of circumstances, but it occurs in
+ -- the context of Aunit and the zero footprint profile. In this case we
+ -- generate:
- 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;
+ -- if not condition then
+ -- raise Assert_Failure;
+ -- end if;
+
+ -- This will then be transformed into a goto, and the local handler will
+ -- be able to handle the assert error (which would not be the case if a
+ -- call is made to the Raise_Assert_Failure procedure).
+
+ -- Note that the reason we do not always generate a direct raise is that
+ -- the form in which the procedure is called allows for more efficient
+ -- breakpointing of assertion errors.
- -- Now generate the if statement. Note that we consider this to be
- -- an explicit conditional in the source, not an implicit if, so we
+ -- Generate the appropriate 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))))));
+ -- Case where we generate a direct raise
+
+ if (Debug_Flag_Dot_G
+ or else Restriction_Active (No_Exception_Propagation))
+ and then Present (Find_Local_Handler (RTE (RE_Assert_Failure), N))
+ then
+ Rewrite (N,
+ Make_If_Statement (Loc,
+ Condition =>
+ Make_Op_Not (Loc,
+ Right_Opnd => Cond),
+ Then_Statements => New_List (
+ Make_Raise_Statement (Loc,
+ Name =>
+ New_Reference_To (RTE (RE_Assert_Failure), Loc)))));
+
+ -- Case where we call the procedure
+
+ else
+ -- First, we need to prepare the string literal
+
+ if Present (Arg2 (N)) then
+ Msg := Strval (Expr_Value_S (Arg2 (N)));
+ else
+ Build_Location_String (Loc);
+ Msg := String_From_Name_Buffer;
+ end if;
+
+ -- Now rewrite as an 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))))));
+ end if;
Analyze (N);
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 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
end if;
end Expand_Pragma_Assert;
- --------------------------
- -- Expand_Pragma_Import --
- --------------------------
+ ---------------------------------
+ -- Expand_Pragma_Common_Object --
+ ---------------------------------
+
+ -- Use a machine attribute to replicate semantic effect in DEC Ada
+
+ -- pragma Machine_Attribute (intern_name, "common_object", extern_name);
+
+ -- For now we do nothing with the size attribute ???
+
+ procedure Expand_Pragma_Common_Object (N : Node_Id) is
+ Loc : constant Source_Ptr := Sloc (N);
+
+ Internal : constant Node_Id := Arg1 (N);
+ External : constant Node_Id := Arg2 (N);
+
+ Psect : Node_Id;
+ -- Psect value upper cased as string literal
+
+ Iloc : constant Source_Ptr := Sloc (Internal);
+ Eloc : constant Source_Ptr := Sloc (External);
+ Ploc : Source_Ptr;
+
+ begin
+ -- Acquire Psect value and fold to upper case
+
+ if Present (External) then
+ if Nkind (External) = N_String_Literal then
+ String_To_Name_Buffer (Strval (External));
+ else
+ Get_Name_String (Chars (External));
+ end if;
+
+ Set_All_Upper_Case;
+
+ Psect :=
+ Make_String_Literal (Eloc,
+ Strval => String_From_Name_Buffer);
+
+ else
+ Get_Name_String (Chars (Internal));
+ Set_All_Upper_Case;
+ Psect :=
+ Make_String_Literal (Iloc,
+ Strval => String_From_Name_Buffer);
+ end if;
+
+ Ploc := Sloc (Psect);
+
+ -- Insert the pragma
+
+ Insert_After_And_Analyze (N,
+
+ Make_Pragma (Loc,
+ Chars => Name_Machine_Attribute,
+ Pragma_Argument_Associations => New_List (
+ Make_Pragma_Argument_Association (Iloc,
+ Expression => New_Copy_Tree (Internal)),
+ Make_Pragma_Argument_Association (Eloc,
+ Expression =>
+ Make_String_Literal (Sloc => Ploc,
+ Strval => "common_object")),
+ Make_Pragma_Argument_Association (Ploc,
+ Expression => New_Copy_Tree (Psect)))));
+
+ end Expand_Pragma_Common_Object;
+
+ ---------------------------------------
+ -- Expand_Pragma_Import_Or_Interface --
+ ---------------------------------------
-- 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.
+ -- declaration. The call is inserted after the declaration, but validity
+ -- checks may also have been inserted and the initialization call does
+ -- not necessarily appear immediately after 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)));
+ procedure Expand_Pragma_Import_Or_Interface (N : Node_Id) is
+ Def_Id : constant Entity_Id := Entity (Arg2 (N));
Typ : Entity_Id;
- After_Def : Node_Id;
+ Init_Call : 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);
+ -- Iterate from declaration of object to import pragma, to find
+ -- generated initialization call for object, if any.
+
+ Init_Call := Next (Parent (Def_Id));
+ while Present (Init_Call) and then Init_Call /= N loop
+ if Has_Non_Null_Base_Init_Proc (Typ)
+ and then Nkind (Init_Call) = N_Procedure_Call_Statement
+ and then Is_Entity_Name (Name (Init_Call))
+ and then Entity (Name (Init_Call)) = Base_Init_Proc (Typ)
+ then
+ Remove (Init_Call);
+ exit;
+ else
+ Next (Init_Call);
+ end if;
+ end loop;
- elsif Is_Access_Type (Typ) then
+ -- Any default initialization expression should be removed
+ -- (e.g., null defaults for access objects, zero initialization
+ -- of packed bit arrays). Imported objects aren't allowed to
+ -- have explicit initialization, so the expression must have
+ -- been generated by the compiler.
+
+ if Init_Call = N
+ and then Present (Expression (Parent (Def_Id)))
+ then
Set_Expression (Parent (Def_Id), Empty);
end if;
end if;
- end Expand_Pragma_Import;
+ end Expand_Pragma_Import_Or_Interface;
-------------------------------------------
-- Expand_Pragma_Import_Export_Exception --
-- 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;
+ -- This pragma is only effective on OpenVMS systems, it was ignored
+ -- on non-VMS systems, and we need to ignore it here as well.
- 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);
+ if not OpenVMS_On_Target then
+ return;
+ end if;
+ declare
+ Id : constant Entity_Id := Entity (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
- 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))));
+ Get_Name_String (Chars (Id));
+ Set_All_Upper_Case;
+ Excep_Image := String_From_Name_Buffer;
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;
+ 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,
+ Chars => Name_uV,
+ Char_Literal_Value =>
+ UI_From_Int (Character'Pos ('V'))));
+ Analyze (Expression (Lang1));
+
+ Rewrite (Expression (Lang2),
+ Make_Character_Literal (Loc,
+ Chars => Name_uM,
+ Char_Literal_Value =>
+ UI_From_Int (Character'Pos ('M'))));
+ Analyze (Expression (Lang2));
+
+ Rewrite (Expression (Lang3),
+ Make_Character_Literal (Loc,
+ Chars => Name_uS,
+ Char_Literal_Value =>
+ UI_From_Int (Character'Pos ('S'))));
+ Analyze (Expression (Lang3));
+
+ if Exception_Code (Id) /= No_Uint then
+ Code :=
+ Make_Integer_Literal (Loc,
+ Intval => Exception_Code (Id));
+
+ Excep_Object :=
+ Make_Object_Declaration (Loc,
+ Defining_Identifier => Excep_Internal,
+ Object_Definition =>
+ New_Reference_To (RTE (RE_Exception_Code), 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 (RTE (RE_Exception_Code),
+ 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,
+ Unchecked_Convert_To (RTE (RE_Exception_Data_Ptr),
+ Make_Attribute_Reference (Loc,
+ Prefix => New_Occurrence_Of (Id, Loc),
+ Attribute_Name => Name_Unrestricted_Access)))));
+
+ Analyze_And_Resolve (Code, RTE (RE_Exception_Code));
+ 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;
+ if No (Interface_Name (Id)) then
+ Set_Interface_Name (Id,
+ Make_String_Literal
+ (Sloc => Loc,
+ Strval => Excep_Image));
+ end if;
+ end;
+ end if;
+ end;
end Expand_Pragma_Import_Export_Exception;
------------------------------------
end if;
end Expand_Pragma_Interrupt_Priority;
+ --------------------------------
+ -- Expand_Pragma_Psect_Object --
+ --------------------------------
+
+ -- Convert to Common_Object, and expand the resulting pragma
+
+ procedure Expand_Pragma_Psect_Object (N : Node_Id) is
+ begin
+ Set_Chars (N, Name_Common_Object);
+ Expand_Pragma_Common_Object (N);
+ end Expand_Pragma_Psect_Object;
+
end Exp_Prag;
OSDN Git Service
