-- --
-- B o d y --
-- --
--- Copyright (C) 1992-2006, Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2010, 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- --
+-- ware Foundation; either version 3, 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, 51 Franklin Street, Fifth Floor, --
--- Boston, MA 02110-1301, USA. --
+-- Public License distributed with GNAT; see file COPYING3. If not, go to --
+-- http://www.gnu.org/licenses for a complete copy of the license. --
-- --
-- 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 Debug; use Debug;
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 Restrict; use Restrict;
+with Rident; use Rident;
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;
function Arg1 (N : Node_Id) return Node_Id;
function Arg2 (N : Node_Id) return Node_Id;
+ function Arg3 (N : Node_Id) return Node_Id;
-- Obtain specified pragma argument expression
procedure Expand_Pragma_Abort_Defer (N : Node_Id);
- procedure Expand_Pragma_Assert (N : Node_Id);
+ procedure Expand_Pragma_Check (N : Node_Id);
procedure Expand_Pragma_Common_Object (N : Node_Id);
- procedure Expand_Pragma_Import (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);
+ procedure Expand_Pragma_Relative_Deadline (N : Node_Id);
----------
-- Arg1 --
function Arg2 (N : Node_Id) return Node_Id is
Arg1 : constant Node_Id := First (Pragma_Argument_Associations (N));
+
begin
if No (Arg1) then
return Empty;
+
else
declare
Arg : constant Node_Id := Next (Arg1);
end if;
end Arg2;
+ ----------
+ -- Arg3 --
+ ----------
+
+ function Arg3 (N : Node_Id) return Node_Id is
+ Arg1 : constant Node_Id := First (Pragma_Argument_Associations (N));
+
+ begin
+ if No (Arg1) then
+ return Empty;
+
+ else
+ declare
+ Arg : Node_Id := Next (Arg1);
+ begin
+ if No (Arg) then
+ return Empty;
+
+ else
+ Next (Arg);
+
+ if Present (Arg)
+ and then Nkind (Arg) = N_Pragma_Argument_Association
+ then
+ return Expression (Arg);
+ else
+ return Arg;
+ end if;
+ end if;
+ end;
+ end if;
+ end Arg3;
+
---------------------
-- Expand_N_Pragma --
---------------------
procedure Expand_N_Pragma (N : Node_Id) is
+ Pname : constant Name_Id := Pragma_Name (N);
+
begin
- -- Note: we may have a pragma whose chars field is not a
+ -- Note: we may have a pragma whose Pragma_Identifier 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
+ if Is_Pragma_Name (Pname) then
+ case Get_Pragma_Id (Pname) is
-- Pragmas requiring special expander action
when Pragma_Abort_Defer =>
Expand_Pragma_Abort_Defer (N);
- when Pragma_Assert =>
- Expand_Pragma_Assert (N);
+ when Pragma_Check =>
+ Expand_Pragma_Check (N);
when Pragma_Common_Object =>
Expand_Pragma_Common_Object (N);
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);
+ when Pragma_Relative_Deadline =>
+ Expand_Pragma_Relative_Deadline (N);
+
-- All other pragmas need no expander action
when others => null;
end Expand_Pragma_Abort_Defer;
--------------------------
- -- Expand_Pragma_Assert --
+ -- Expand_Pragma_Check --
--------------------------
- procedure Expand_Pragma_Assert (N : Node_Id) is
- Loc : constant Source_Ptr := Sloc (N);
- Cond : constant Node_Id := Arg1 (N);
- Msg : String_Id;
+ procedure Expand_Pragma_Check (N : Node_Id) is
+ Cond : constant Node_Id := Arg2 (N);
+ Loc : constant Source_Ptr := Sloc (Cond);
+ Nam : constant Name_Id := Chars (Arg1 (N));
+ Msg : Node_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);
+ -- We already know that this check is enabled, because otherwise the
+ -- semantic pass dealt with rewriting the assertion (see Sem_Prag)
- -- Since assertions are on, we rewrite the pragma with its
+ -- Since this check is enabled, we rewrite the pragma into a
-- corresponding if statement, and then analyze the statement
- -- The expansion transforms:
- -- pragma Assert (condition [,message]);
+ -- The normal case expansion transforms:
+
+ -- pragma Check (name, condition [,message]);
-- into
-- end if;
-- where Str is the message if one is present, or the default of
- -- file:line if no message is given.
+ -- name failed at file:line if no message is given (the "name failed
+ -- at" is omitted for name = Assertion, since it is redundant, given
+ -- that the name of the exception is Assert_Failure.
- -- 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 (Arg2 (N)));
- else
- Build_Location_String (Loc);
- Msg := String_From_Name_Buffer;
- end if;
+ -- if not condition then
+ -- raise Assert_Failure;
+ -- 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
+ -- 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.
+
+ -- 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 argument
+
+ -- If we have a message given, use it
+
+ if Present (Arg3 (N)) then
+ Msg := Arg3 (N);
+
+ -- Otherwise string is "name failed at location" except in the case
+ -- of Assertion where "name failed at" is omitted.
+
+ else
+ if Nam = Name_Assertion then
+ Name_Len := 0;
+ else
+ Get_Name_String (Nam);
+ Set_Casing (Identifier_Casing (Current_Source_File));
+ Add_Str_To_Name_Buffer (" failed at ");
+ end if;
+
+ Build_Location_String (Loc);
+ Msg :=
+ Make_String_Literal (Loc,
+ Strval => 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 (Msg)))));
+ end if;
Analyze (N);
-- If new condition is always false, give a warning
- if Nkind (N) = N_Procedure_Call_Statement
+ if Warn_On_Assertion_Failure
+ and then 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 intended 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;
+ elsif Nam = Name_Assertion then
+ Error_Msg_N ("?assertion will fail at run time", N);
else
- Error_Msg_N ("?assertion will fail at run-time", N);
+ Error_Msg_N ("?check will fail at run time", N);
end if;
end if;
- end Expand_Pragma_Assert;
+ end Expand_Pragma_Check;
---------------------------------
-- Expand_Pragma_Common_Object --
---------------------------------
- -- Add series of pragmas to replicate semantic effect in DEC Ada
+ -- Use a machine attribute to replicate semantic effect in DEC Ada
- -- pragma Linker_Section (internal_name, external_name);
- -- pragma Machine_Attribute (internal_name, "overlaid");
- -- pragma Machine_Attribute (internal_name, "global");
- -- pragma Machine_Attribute (internal_name, "initialize");
+ -- pragma Machine_Attribute (intern_name, "common_object", extern_name);
-- For now we do nothing with the size attribute ???
- -- Really this expansion would be much better in the back end. The
- -- front end should not need to know about target dependent, back end
- -- dependent semantics ???
+ -- Note: Psect_Object shares this processing
procedure Expand_Pragma_Common_Object (N : Node_Id) is
Loc : constant Source_Ptr := Sloc (N);
Ploc := Sloc (Psect);
- -- Insert pragmas
-
- Insert_List_After_And_Analyze (N, New_List (
-
- -- The Linker_Section pragma ensures the correct section
-
- Make_Pragma (Loc,
- Chars => Name_Linker_Section,
- Pragma_Argument_Associations => New_List (
- Make_Pragma_Argument_Association (Iloc,
- Expression => New_Copy_Tree (Internal)),
- Make_Pragma_Argument_Association (Ploc,
- Expression => New_Copy_Tree (Psect)))),
-
- -- Machine_Attribute "overlaid" ensures that this section
- -- overlays any other sections of the same name.
-
- 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 => "overlaid")))),
-
- -- Machine_Attribute "global" ensures that section is visible
+ -- Insert the pragma
+ Insert_After_And_Analyze (N,
Make_Pragma (Loc,
Chars => Name_Machine_Attribute,
Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Eloc,
Expression =>
Make_String_Literal (Sloc => Ploc,
- Strval => "global")))),
-
- -- Machine_Attribute "initialize" ensures section is demand zeroed
+ Strval => "common_object")),
+ Make_Pragma_Argument_Association (Ploc,
+ Expression => New_Copy_Tree (Psect)))));
- 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 => "initialize"))))));
end Expand_Pragma_Common_Object;
- --------------------------
- -- Expand_Pragma_Import --
- --------------------------
+ ---------------------------------------
+ -- 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
-- 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
+ procedure Expand_Pragma_Import_Or_Interface (N : Node_Id) is
Def_Id : constant Entity_Id := Entity (Arg2 (N));
- Typ : Entity_Id;
Init_Call : Node_Id;
begin
if Ekind (Def_Id) = E_Variable then
- Typ := Etype (Def_Id);
- -- Loop 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;
+ Init_Call := Find_Init_Call (Def_Id, Rep_Clause => N);
+ if Present (Init_Call) then
+ Remove (Init_Call);
+ end if;
-- Any default initialization expression should be removed
-- (e.g., null defaults for access objects, zero initialization
-- have explicit initialization, so the expression must have
-- been generated by the compiler.
- if No (Init_Call)
- and then Present (Expression (Parent (Def_Id)))
- then
+ if No (Init_Call) 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 --
begin
if Present (Call) then
declare
- Excep_Internal : constant Node_Id :=
- Make_Defining_Identifier
- (Loc, New_Internal_Name ('V'));
+ Excep_Internal : constant Node_Id := Make_Temporary (Loc, '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;
+ Excep_Image : String_Id;
+ Exdata : List_Id;
+ Lang_Char : Node_Id;
+ Code : Node_Id;
begin
if Present (Interface_Name (Id)) then
Exdata := Component_Associations (Expression (Parent (Id)));
if Is_VMS_Exception (Id) then
- Lang1 := Next (First (Exdata));
- Lang2 := Next (Lang1);
- Lang3 := Next (Lang2);
+ Lang_Char := Next (First (Exdata));
+
+ -- Change the one-character language designator to 'V'
- Rewrite (Expression (Lang1),
+ Rewrite (Expression (Lang_Char),
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));
+ Analyze (Expression (Lang_Char));
if Exception_Code (Id) /= No_Uint then
Code :=
-- Convert to Common_Object, and expand the resulting pragma
- procedure Expand_Pragma_Psect_Object (N : Node_Id) is
+ procedure Expand_Pragma_Psect_Object (N : Node_Id)
+ renames Expand_Pragma_Common_Object;
+
+ -------------------------------------
+ -- Expand_Pragma_Relative_Deadline --
+ -------------------------------------
+
+ procedure Expand_Pragma_Relative_Deadline (N : Node_Id) is
+ P : constant Node_Id := Parent (N);
+ Loc : constant Source_Ptr := Sloc (N);
+
begin
- Set_Chars (N, Name_Common_Object);
- Expand_Pragma_Common_Object (N);
- end Expand_Pragma_Psect_Object;
+ -- Expand the pragma only in the case of the main subprogram. For tasks
+ -- the expansion is done in exp_ch9. Generate a call to Set_Deadline
+ -- at Clock plus the relative deadline specified in the pragma. Time
+ -- values are translated into Duration to allow for non-private
+ -- addition operation.
+
+ if Nkind (P) = N_Subprogram_Body then
+ Rewrite
+ (N,
+ Make_Procedure_Call_Statement (Loc,
+ Name => New_Reference_To (RTE (RE_Set_Deadline), Loc),
+ Parameter_Associations => New_List (
+ Unchecked_Convert_To (RTE (RO_RT_Time),
+ Make_Op_Add (Loc,
+ Left_Opnd =>
+ Make_Function_Call (Loc,
+ New_Reference_To (RTE (RO_RT_To_Duration), Loc),
+ New_List (Make_Function_Call (Loc,
+ New_Reference_To (RTE (RE_Clock), Loc)))),
+ Right_Opnd =>
+ Unchecked_Convert_To (Standard_Duration, Arg1 (N)))))));
+
+ Analyze (N);
+ end if;
+ end Expand_Pragma_Relative_Deadline;
end Exp_Prag;
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