-- --
-- B o d y --
-- --
--- Copyright (C) 1992-2008, Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2011, 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- --
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 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_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 --
---------------------
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);
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);
+ 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)
+ Loc : constant Source_Ptr := Sloc (First_Node (Cond));
+ -- Source location used in the case of a failed assertion. Note that
+ -- the source location of the expression is not usually the best choice
+ -- here. For example, it gets located on the last AND keyword in a
+ -- chain of boolean expressiond AND'ed together. It is best to put the
+ -- message on the first character of the assertion, which is the effect
+ -- of the First_Node call here.
- pragma Assert (Assertions_Enabled);
+ begin
+ -- 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 normal case expansion transforms:
- -- pragma Assert (condition [,message]);
+ -- 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.)
-- An alternative expansion is used when the No_Exception_Propagation
-- restriction is active and there is a local Assert_Failure handler.
-- be able to handle the assert error (which would not be the case if a
-- call is made to the Raise_Assert_Failure procedure).
+ -- We also generate the direct raise if the Suppress_Exception_Locations
+ -- is active, since we don't want to generate messages in this case.
+
-- 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.
-- 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))
+ if ((Debug_Flag_Dot_G
+ or else Restriction_Active (No_Exception_Propagation))
+ and then Present (Find_Local_Handler (RTE (RE_Assert_Failure), N)))
+ or else (Opt.Exception_Locations_Suppressed and then No (Arg3 (N)))
then
Rewrite (N,
Make_If_Statement (Loc,
-- Case where we call the procedure
else
- -- First, we need to prepare the string literal
+ -- If we have a message given, use it
+
+ if Present (Arg3 (N)) then
+ Msg := Get_Pragma_Arg (Arg3 (N));
+
+ -- Here we have no string, so prepare one
- if Present (Arg2 (N)) then
- Msg := Strval (Expr_Value_S (Arg2 (N)));
else
- Build_Location_String (Loc);
- Msg := String_From_Name_Buffer;
+ declare
+ Msg_Loc : constant String := Build_Location_String (Loc);
+
+ begin
+ Name_Len := 0;
+
+ -- For Assert, we just use the location
+
+ if Nam = Name_Assertion then
+ null;
+
+ -- For predicate, we generate the string "predicate failed
+ -- at yyy". We prefer all lower case for predicate.
+
+ elsif Nam = Name_Predicate then
+ Add_Str_To_Name_Buffer ("predicate failed at ");
+
+ -- For special case of Precondition/Postcondition the string is
+ -- "failed xx from yy" where xx is precondition/postcondition
+ -- in all lower case. The reason for this different wording is
+ -- that the failure is not at the point of occurrence of the
+ -- pragma, unlike the other Check cases.
+
+ elsif Nam = Name_Precondition
+ or else
+ Nam = Name_Postcondition
+ then
+ Get_Name_String (Nam);
+ Insert_Str_In_Name_Buffer ("failed ", 1);
+ Add_Str_To_Name_Buffer (" from ");
+
+ -- For all other checks, the string is "xxx failed at yyy"
+ -- where xxx is the check name with current source file casing.
+
+ else
+ Get_Name_String (Nam);
+ Set_Casing (Identifier_Casing (Current_Source_File));
+ Add_Str_To_Name_Buffer (" failed at ");
+ end if;
+
+ -- In all cases, add location string
+
+ Add_Str_To_Name_Buffer (Msg_Loc);
+
+ -- Build the message
+
+ Msg := Make_String_Literal (Loc, Name_Buffer (1 .. Name_Len));
+ end;
end if;
-- Now rewrite as an if statement
Make_Procedure_Call_Statement (Loc,
Name =>
New_Reference_To (RTE (RE_Raise_Assert_Failure), Loc),
- Parameter_Associations => New_List (
- Make_String_Literal (Loc, Msg))))));
+ Parameter_Associations => New_List (Relocate_Node (Msg))))));
end if;
Analyze (N);
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 --
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);
- -- Iterate from declaration of object to import pragma, to find
- -- generated initialization call for object, if any.
+ -- 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 Init_Call = N
- 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;
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));
- Rewrite (Expression (Lang1),
+ -- Change the one-character language designator to 'V'
+
+ 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 :=
(Loc,
Name_Export,
New_List
- (Make_Pragma_Argument_Association
- (Sloc => Loc,
- Expression => Make_Identifier (Loc, Name_C)),
+ (Make_Pragma_Argument_Association (Loc,
+ Expression => Make_Identifier (Loc, Name_C)),
- Make_Pragma_Argument_Association
- (Sloc => Loc,
- Expression =>
- New_Reference_To (Excep_Internal, Loc)),
+ Make_Pragma_Argument_Association (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 (Loc,
+ Expression =>
+ Make_String_Literal (Loc, Excep_Image)),
- Make_Pragma_Argument_Association
- (Sloc => Loc,
+ Make_Pragma_Argument_Association (Loc,
Expression =>
- Make_String_Literal
- (Sloc => Loc,
- Strval => Excep_Image))));
+ Make_String_Literal (Loc, Excep_Image))));
Insert_Action (N, Export_Pragma);
Analyze (Export_Pragma);
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
+ -- 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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