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|
------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- P A R . P R A G --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2021, 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 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 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. --
-- --
------------------------------------------------------------------------------
-- Generally the parser checks the basic syntax of pragmas, but does not
-- do specialized syntax checks for individual pragmas, these are deferred
-- to semantic analysis time (see unit Sem_Prag). There are some pragmas
-- which require recognition and either partial or complete processing
-- during parsing, and this unit performs this required processing.
with Fname.UF; use Fname.UF;
with Osint; use Osint;
with Rident; use Rident;
with Restrict; use Restrict;
with Stringt; use Stringt;
with Stylesw; use Stylesw;
with Uintp; use Uintp;
with Uname; use Uname;
with System.WCh_Con; use System.WCh_Con;
separate (Par)
function Prag (Pragma_Node : Node_Id; Semi : Source_Ptr) return Node_Id is
Prag_Name : constant Name_Id := Pragma_Name_Unmapped (Pragma_Node);
Prag_Id : constant Pragma_Id := Get_Pragma_Id (Prag_Name);
Pragma_Sloc : constant Source_Ptr := Sloc (Pragma_Node);
Arg_Count : Nat;
Arg_Node : Node_Id;
-----------------------
-- Local Subprograms --
-----------------------
procedure Add_List_Pragma_Entry (PT : List_Pragma_Type; Loc : Source_Ptr);
-- Make a new entry in the List_Pragmas table if this entry is not already
-- in the table (it will always be the last one if there is a duplication
-- resulting from the use of Save/Restore_Scan_State).
function Arg1 return Node_Id;
function Arg2 return Node_Id;
function Arg3 return Node_Id;
-- Obtain specified Pragma_Argument_Association. It is allowable to call
-- the routine for the argument one past the last present argument, but
-- that is the only case in which a non-present argument can be referenced.
procedure Check_Arg_Count (Required : Int);
-- Check argument count for pragma = Required. If not give error and raise
-- Error_Resync.
procedure Check_Arg_Is_String_Literal (Arg : Node_Id);
-- Check the expression of the specified argument to make sure that it
-- is a string literal. If not give error and raise Error_Resync.
procedure Check_Arg_Is_On_Or_Off (Arg : Node_Id);
-- Check the expression of the specified argument to make sure that it
-- is an identifier which is either ON or OFF, and if not, then issue
-- an error message and raise Error_Resync.
procedure Check_No_Identifier (Arg : Node_Id);
-- Checks that the given argument does not have an identifier. If
-- an identifier is present, then an error message is issued, and
-- Error_Resync is raised.
procedure Check_Optional_Identifier (Arg : Node_Id; Id : Name_Id);
-- Checks if the given argument has an identifier, and if so, requires
-- it to match the given identifier name. If there is a non-matching
-- identifier, then an error message is given and Error_Resync raised.
procedure Check_Required_Identifier (Arg : Node_Id; Id : Name_Id);
-- Same as Check_Optional_Identifier, except that the name is required
-- to be present and to match the given Id value.
procedure Process_Restrictions_Or_Restriction_Warnings;
-- Common processing for Restrictions and Restriction_Warnings pragmas.
-- For the most part, restrictions need not be processed at parse time,
-- since they only affect semantic processing. This routine handles the
-- exceptions as follows
--
-- No_Obsolescent_Features must be processed at parse time, since there
-- are some obsolescent features (e.g. character replacements) which are
-- handled at parse time.
--
-- No_Dependence must be processed at parse time, since otherwise it gets
-- handled too late.
--
-- No_Unrecognized_Aspects must be processed at parse time, since
-- unrecognized aspects are ignored by the parser.
--
-- Note that we don't need to do full error checking for badly formed cases
-- of restrictions, since these will be caught during semantic analysis.
---------------------------
-- Add_List_Pragma_Entry --
---------------------------
procedure Add_List_Pragma_Entry (PT : List_Pragma_Type; Loc : Source_Ptr) is
begin
if List_Pragmas.Last < List_Pragmas.First
or else (List_Pragmas.Table (List_Pragmas.Last)) /= ((PT, Loc))
then
List_Pragmas.Append ((PT, Loc));
end if;
end Add_List_Pragma_Entry;
----------
-- Arg1 --
----------
function Arg1 return Node_Id is
begin
return First (Pragma_Argument_Associations (Pragma_Node));
end Arg1;
----------
-- Arg2 --
----------
function Arg2 return Node_Id is
begin
return Next (Arg1);
end Arg2;
----------
-- Arg3 --
----------
function Arg3 return Node_Id is
begin
return Next (Arg2);
end Arg3;
---------------------
-- Check_Arg_Count --
---------------------
procedure Check_Arg_Count (Required : Int) is
begin
if Arg_Count /= Required then
Error_Msg_N ("wrong number of arguments for pragma%", Pragma_Node);
raise Error_Resync;
end if;
end Check_Arg_Count;
----------------------------
-- Check_Arg_Is_On_Or_Off --
----------------------------
procedure Check_Arg_Is_On_Or_Off (Arg : Node_Id) is
Argx : constant Node_Id := Expression (Arg);
begin
if Nkind (Expression (Arg)) /= N_Identifier
or else Chars (Argx) not in Name_On | Name_Off
then
Error_Msg_Name_2 := Name_On;
Error_Msg_Name_3 := Name_Off;
Error_Msg_N ("argument for pragma% must be% or%", Argx);
raise Error_Resync;
end if;
end Check_Arg_Is_On_Or_Off;
---------------------------------
-- Check_Arg_Is_String_Literal --
---------------------------------
procedure Check_Arg_Is_String_Literal (Arg : Node_Id) is
begin
if Nkind (Expression (Arg)) /= N_String_Literal then
Error_Msg_N
("argument for pragma% must be string literal",
Expression (Arg));
raise Error_Resync;
end if;
end Check_Arg_Is_String_Literal;
-------------------------
-- Check_No_Identifier --
-------------------------
procedure Check_No_Identifier (Arg : Node_Id) is
begin
if Chars (Arg) /= No_Name then
Error_Msg_N ("pragma% does not permit named arguments", Arg);
raise Error_Resync;
end if;
end Check_No_Identifier;
-------------------------------
-- Check_Optional_Identifier --
-------------------------------
procedure Check_Optional_Identifier (Arg : Node_Id; Id : Name_Id) is
begin
if Present (Arg) and then Chars (Arg) /= No_Name then
if Chars (Arg) /= Id then
Error_Msg_Name_2 := Id;
Error_Msg_N ("pragma% argument expects identifier%", Arg);
end if;
end if;
end Check_Optional_Identifier;
-------------------------------
-- Check_Required_Identifier --
-------------------------------
procedure Check_Required_Identifier (Arg : Node_Id; Id : Name_Id) is
begin
if Chars (Arg) /= Id then
Error_Msg_Name_2 := Id;
Error_Msg_N ("pragma% argument must have identifier%", Arg);
end if;
end Check_Required_Identifier;
--------------------------------------------------
-- Process_Restrictions_Or_Restriction_Warnings --
--------------------------------------------------
procedure Process_Restrictions_Or_Restriction_Warnings is
Arg : Node_Id;
Id : Name_Id;
Expr : Node_Id;
begin
Arg := Arg1;
while Present (Arg) loop
Id := Chars (Arg);
Expr := Expression (Arg);
if Id = No_Name and then Nkind (Expr) = N_Identifier then
case Chars (Expr) is
when Name_No_Obsolescent_Features =>
Set_Restriction (No_Obsolescent_Features, Pragma_Node);
Restriction_Warnings (No_Obsolescent_Features) :=
Prag_Id = Pragma_Restriction_Warnings;
when Name_SPARK_05 =>
Error_Msg_Name_1 := Chars (Expr);
Error_Msg_N
("??% restriction is obsolete and ignored, consider " &
"using 'S'P'A'R'K_'Mode and gnatprove instead", Arg);
when Name_No_Unrecognized_Aspects =>
Set_Restriction
(No_Unrecognized_Aspects,
Pragma_Node,
Prag_Id = Pragma_Restriction_Warnings);
when others =>
null;
end case;
elsif Id = Name_No_Dependence then
Set_Restriction_No_Dependence
(Unit => Expr,
Warn => Prag_Id = Pragma_Restriction_Warnings
or else Treat_Restrictions_As_Warnings);
end if;
Next (Arg);
end loop;
end Process_Restrictions_Or_Restriction_Warnings;
-- Start of processing for Prag
begin
Error_Msg_Name_1 := Prag_Name;
-- Ignore unrecognized pragma. We let Sem post the warning for this, since
-- it is a semantic error, not a syntactic one (we have already checked
-- the syntax for the unrecognized pragma as required by (RM 2.8(11)).
if Prag_Id = Unknown_Pragma then
return Pragma_Node;
end if;
-- Ignore pragma if Ignore_Pragma applies. Also ignore pragma
-- Default_Scalar_Storage_Order if the -gnatI switch was given.
if Should_Ignore_Pragma_Par (Prag_Name)
or else (Prag_Id = Pragma_Default_Scalar_Storage_Order
and then Ignore_Rep_Clauses)
then
return Pragma_Node;
end if;
-- Count number of arguments. This loop also checks if any of the arguments
-- are Error, indicating a syntax error as they were parsed. If so, we
-- simply return, because we get into trouble with cascaded errors if we
-- try to perform our error checks on junk arguments.
Arg_Count := 0;
if Present (Pragma_Argument_Associations (Pragma_Node)) then
Arg_Node := Arg1;
while Arg_Node /= Empty loop
Arg_Count := Arg_Count + 1;
if Expression (Arg_Node) = Error then
return Error;
end if;
Next (Arg_Node);
end loop;
end if;
-- Remaining processing is pragma dependent
case Prag_Id is
-- Ada version pragmas must be processed at parse time, because we want
-- to set the Ada version properly at parse time to recognize the
-- appropriate Ada version syntax. However, pragma Ada_2005 and higher
-- have an optional argument; it is only the zero argument form that
-- must be processed at parse time.
------------
-- Ada_83 --
------------
when Pragma_Ada_83 =>
if not Latest_Ada_Only then
Ada_Version := Ada_83;
Ada_Version_Explicit := Ada_83;
Ada_Version_Pragma := Pragma_Node;
end if;
------------
-- Ada_95 --
------------
when Pragma_Ada_95 =>
if not Latest_Ada_Only then
Ada_Version := Ada_95;
Ada_Version_Explicit := Ada_95;
Ada_Version_Pragma := Pragma_Node;
end if;
---------------------
-- Ada_05/Ada_2005 --
---------------------
when Pragma_Ada_05
| Pragma_Ada_2005
=>
if Arg_Count = 0 and not Latest_Ada_Only then
Ada_Version := Ada_2005;
Ada_Version_Explicit := Ada_2005;
Ada_Version_Pragma := Pragma_Node;
end if;
---------------------
-- Ada_12/Ada_2012 --
---------------------
when Pragma_Ada_12
| Pragma_Ada_2012
=>
if Arg_Count = 0 then
Ada_Version := Ada_2012;
Ada_Version_Explicit := Ada_2012;
Ada_Version_Pragma := Pragma_Node;
end if;
--------------
-- Ada_2022 --
--------------
when Pragma_Ada_2022 =>
if Arg_Count = 0 then
Ada_Version := Ada_2022;
Ada_Version_Explicit := Ada_2022;
Ada_Version_Pragma := Pragma_Node;
end if;
-----------
-- Debug --
-----------
-- pragma Debug ([boolean_EXPRESSION,] PROCEDURE_CALL_STATEMENT);
when Pragma_Debug =>
Check_No_Identifier (Arg1);
if Arg_Count = 2 then
Check_No_Identifier (Arg2);
else
Check_Arg_Count (1);
end if;
-------------------------------
-- Extensions_Allowed (GNAT) --
-------------------------------
-- pragma Extensions_Allowed (Off | On)
-- The processing for pragma Extensions_Allowed must be done at
-- parse time, since extensions mode may affect what is accepted.
when Pragma_Extensions_Allowed =>
Check_Arg_Count (1);
Check_No_Identifier (Arg1);
Check_Arg_Is_On_Or_Off (Arg1);
if Chars (Expression (Arg1)) = Name_On then
Ada_Version := Ada_With_Extensions;
else
Ada_Version := Ada_Version_Explicit;
end if;
-------------------
-- Ignore_Pragma --
-------------------
-- Processing for this pragma must be done at parse time, since we want
-- be able to ignore pragmas that are otherwise processed at parse time.
when Pragma_Ignore_Pragma => Ignore_Pragma : declare
A : Node_Id;
begin
Check_Arg_Count (1);
Check_No_Identifier (Arg1);
A := Expression (Arg1);
if Nkind (A) /= N_Identifier then
Error_Msg_N ("incorrect argument for pragma %", A);
else
Set_Name_Table_Boolean3 (Chars (A), True);
end if;
end Ignore_Pragma;
----------------
-- List (2.8) --
----------------
-- pragma List (Off | On)
-- The processing for pragma List must be done at parse time, since a
-- listing can be generated in parse only mode.
when Pragma_List =>
Check_Arg_Count (1);
Check_No_Identifier (Arg1);
Check_Arg_Is_On_Or_Off (Arg1);
-- We unconditionally make a List_On entry for the pragma, so that
-- in the List (Off) case, the pragma will print even in a region
-- of code with listing turned off (this is required).
Add_List_Pragma_Entry (List_On, Sloc (Pragma_Node));
-- Now generate the list off entry for pragma List (Off)
if Chars (Expression (Arg1)) = Name_Off then
Add_List_Pragma_Entry (List_Off, Semi);
end if;
----------------
-- Page (2.8) --
----------------
-- pragma Page;
-- Processing for this pragma must be done at parse time, since a
-- listing can be generated in parse only mode with semantics off.
when Pragma_Page =>
Check_Arg_Count (0);
Add_List_Pragma_Entry (Page, Semi);
------------------
-- Restrictions --
------------------
-- pragma Restrictions (RESTRICTION {, RESTRICTION});
-- RESTRICTION ::=
-- restriction_IDENTIFIER
-- | restriction_parameter_IDENTIFIER => EXPRESSION
-- We process the case of No_Obsolescent_Features, since this has
-- a syntactic effect that we need to detect at parse time (the use
-- of replacement characters such as colon for pound sign).
when Pragma_Restrictions =>
Process_Restrictions_Or_Restriction_Warnings;
--------------------------
-- Restriction_Warnings --
--------------------------
-- pragma Restriction_Warnings (RESTRICTION {, RESTRICTION});
-- RESTRICTION ::=
-- restriction_IDENTIFIER
-- | restriction_parameter_IDENTIFIER => EXPRESSION
-- See above comment for pragma Restrictions
when Pragma_Restriction_Warnings =>
Process_Restrictions_Or_Restriction_Warnings;
----------------------------------------------------------
-- Source_File_Name and Source_File_Name_Project (GNAT) --
----------------------------------------------------------
-- These two pragmas have the same syntax and semantics.
-- There are five forms of these pragmas:
-- pragma Source_File_Name[_Project] (
-- [UNIT_NAME =>] unit_NAME,
-- BODY_FILE_NAME => STRING_LITERAL
-- [, [INDEX =>] INTEGER_LITERAL]);
-- pragma Source_File_Name[_Project] (
-- [UNIT_NAME =>] unit_NAME,
-- SPEC_FILE_NAME => STRING_LITERAL
-- [, [INDEX =>] INTEGER_LITERAL]);
-- pragma Source_File_Name[_Project] (
-- BODY_FILE_NAME => STRING_LITERAL
-- [, DOT_REPLACEMENT => STRING_LITERAL]
-- [, CASING => CASING_SPEC]);
-- pragma Source_File_Name[_Project] (
-- SPEC_FILE_NAME => STRING_LITERAL
-- [, DOT_REPLACEMENT => STRING_LITERAL]
-- [, CASING => CASING_SPEC]);
-- pragma Source_File_Name[_Project] (
-- SUBUNIT_FILE_NAME => STRING_LITERAL
-- [, DOT_REPLACEMENT => STRING_LITERAL]
-- [, CASING => CASING_SPEC]);
-- CASING_SPEC ::= Uppercase | Lowercase | Mixedcase
-- Pragma Source_File_Name_Project (SFNP) is equivalent to pragma
-- Source_File_Name (SFN), however their usage is exclusive:
-- SFN can only be used when no project file is used, while
-- SFNP can only be used when a project file is used.
-- The Project Manager produces a configuration pragmas file that
-- is communicated to the compiler with -gnatec switch. This file
-- contains only SFNP pragmas (at least two for the default naming
-- scheme. As this configuration pragmas file is always the first
-- processed by the compiler, it prevents the use of pragmas SFN in
-- other config files when a project file is in use.
-- Note: we process this during parsing, since we need to have the
-- source file names set well before the semantic analysis starts,
-- since we load the spec and with'ed packages before analysis.
when Pragma_Source_File_Name
| Pragma_Source_File_Name_Project
=>
Source_File_Name : declare
Unam : Unit_Name_Type;
Expr1 : Node_Id;
Pat : String_Ptr;
Typ : Character;
Dot : String_Ptr;
Cas : Casing_Type;
Nast : Nat;
Expr : Node_Id;
Index : Nat;
function Get_Fname (Arg : Node_Id) return File_Name_Type;
-- Process file name from unit name form of pragma
function Get_String_Argument (Arg : Node_Id) return String_Ptr;
-- Process string literal value from argument
procedure Process_Casing (Arg : Node_Id);
-- Process Casing argument of pattern form of pragma
procedure Process_Dot_Replacement (Arg : Node_Id);
-- Process Dot_Replacement argument of pattern form of pragma
---------------
-- Get_Fname --
---------------
function Get_Fname (Arg : Node_Id) return File_Name_Type is
begin
String_To_Name_Buffer (Strval (Expression (Arg)));
for J in 1 .. Name_Len loop
if Is_Directory_Separator (Name_Buffer (J)) then
Error_Msg
("directory separator character not allowed",
Sloc (Expression (Arg)) + Source_Ptr (J));
end if;
end loop;
return Name_Find;
end Get_Fname;
-------------------------
-- Get_String_Argument --
-------------------------
function Get_String_Argument (Arg : Node_Id) return String_Ptr is
Str : String_Id;
begin
if Nkind (Expression (Arg)) /= N_String_Literal
and then
Nkind (Expression (Arg)) /= N_Operator_Symbol
then
Error_Msg_N
("argument for pragma% must be string literal", Arg);
raise Error_Resync;
end if;
Str := Strval (Expression (Arg));
-- Check string has no wide chars
for J in 1 .. String_Length (Str) loop
if Get_String_Char (Str, J) > 255 then
Error_Msg
("wide character not allowed in pattern for pragma%",
Sloc (Expression (Arg2)) + Text_Ptr (J) - 1);
end if;
end loop;
-- Acquire string
String_To_Name_Buffer (Str);
return new String'(Name_Buffer (1 .. Name_Len));
end Get_String_Argument;
--------------------
-- Process_Casing --
--------------------
procedure Process_Casing (Arg : Node_Id) is
Expr : constant Node_Id := Expression (Arg);
begin
Check_Required_Identifier (Arg, Name_Casing);
if Nkind (Expr) = N_Identifier then
if Chars (Expr) = Name_Lowercase then
Cas := All_Lower_Case;
return;
elsif Chars (Expr) = Name_Uppercase then
Cas := All_Upper_Case;
return;
elsif Chars (Expr) = Name_Mixedcase then
Cas := Mixed_Case;
return;
end if;
end if;
Error_Msg_N
("Casing argument for pragma% must be " &
"one of Mixedcase, Lowercase, Uppercase",
Arg);
end Process_Casing;
-----------------------------
-- Process_Dot_Replacement --
-----------------------------
procedure Process_Dot_Replacement (Arg : Node_Id) is
begin
Check_Required_Identifier (Arg, Name_Dot_Replacement);
Dot := Get_String_Argument (Arg);
end Process_Dot_Replacement;
-- Start of processing for Source_File_Name and
-- Source_File_Name_Project pragmas.
begin
if Prag_Id = Pragma_Source_File_Name then
if Project_File_In_Use = In_Use then
Error_Msg_N
("pragma Source_File_Name cannot be used " &
"with a project file", Pragma_Node);
else
Project_File_In_Use := Not_In_Use;
end if;
else
if Project_File_In_Use = Not_In_Use then
Error_Msg_N
("pragma Source_File_Name_Project should only be used " &
"with a project file", Pragma_Node);
else
Project_File_In_Use := In_Use;
end if;
end if;
-- We permit from 1 to 3 arguments
if Arg_Count not in 1 .. 3 then
Check_Arg_Count (1);
end if;
Expr1 := Expression (Arg1);
-- If first argument is identifier or selected component, then
-- we have the specific file case of the Source_File_Name pragma,
-- and the first argument is a unit name.
if Nkind (Expr1) = N_Identifier
or else
(Nkind (Expr1) = N_Selected_Component
and then
Nkind (Selector_Name (Expr1)) = N_Identifier)
then
if Nkind (Expr1) = N_Identifier
and then Chars (Expr1) = Name_System
then
Error_Msg_N
("pragma Source_File_Name may not be used for System",
Arg1);
return Error;
end if;
-- Process index argument if present
if Arg_Count = 3 then
Expr := Expression (Arg3);
if Nkind (Expr) /= N_Integer_Literal
or else not UI_Is_In_Int_Range (Intval (Expr))
or else Intval (Expr) > 999
or else Intval (Expr) <= 0
then
Error_Msg_N
("pragma% index must be integer literal" &
" in range 1 .. 999", Expr);
raise Error_Resync;
else
Index := UI_To_Int (Intval (Expr));
end if;
-- No index argument present
else
Check_Arg_Count (2);
Index := 0;
end if;
Check_Optional_Identifier (Arg1, Name_Unit_Name);
Unam := Get_Unit_Name (Expr1);
Check_Arg_Is_String_Literal (Arg2);
if Chars (Arg2) = Name_Spec_File_Name then
Set_File_Name
(Get_Spec_Name (Unam), Get_Fname (Arg2), Index);
elsif Chars (Arg2) = Name_Body_File_Name then
Set_File_Name
(Unam, Get_Fname (Arg2), Index);
else
Error_Msg_N
("pragma% argument has incorrect identifier", Arg2);
return Pragma_Node;
end if;
-- If the first argument is not an identifier, then we must have
-- the pattern form of the pragma, and the first argument must be
-- the pattern string with an appropriate name.
else
if Chars (Arg1) = Name_Spec_File_Name then
Typ := 's';
elsif Chars (Arg1) = Name_Body_File_Name then
Typ := 'b';
elsif Chars (Arg1) = Name_Subunit_File_Name then
Typ := 'u';
elsif Chars (Arg1) = Name_Unit_Name then
Error_Msg_N
("Unit_Name parameter for pragma% must be an identifier",
Arg1);
raise Error_Resync;
else
Error_Msg_N
("pragma% argument has incorrect identifier", Arg1);
raise Error_Resync;
end if;
Pat := Get_String_Argument (Arg1);
-- Check pattern has exactly one asterisk
Nast := 0;
for J in Pat'Range loop
if Pat (J) = '*' then
Nast := Nast + 1;
end if;
end loop;
if Nast /= 1 then
Error_Msg_N
("file name pattern must have exactly one * character",
Arg1);
return Pragma_Node;
end if;
-- Set defaults for Casing and Dot_Separator parameters
Cas := All_Lower_Case;
Dot := new String'(".");
-- Process second and third arguments if present
if Arg_Count > 1 then
if Chars (Arg2) = Name_Casing then
Process_Casing (Arg2);
if Arg_Count = 3 then
Process_Dot_Replacement (Arg3);
end if;
else
Process_Dot_Replacement (Arg2);
if Arg_Count = 3 then
Process_Casing (Arg3);
end if;
end if;
end if;
Set_File_Name_Pattern (Pat, Typ, Dot, Cas);
end if;
end Source_File_Name;
-----------------------------
-- Source_Reference (GNAT) --
-----------------------------
-- pragma Source_Reference
-- (INTEGER_LITERAL [, STRING_LITERAL] );
-- Processing for this pragma must be done at parse time, since error
-- messages needing the proper line numbers can be generated in parse
-- only mode with semantic checking turned off, and indeed we usually
-- turn off semantic checking anyway if any parse errors are found.
when Pragma_Source_Reference => Source_Reference : declare
Fname : File_Name_Type;
begin
if Arg_Count /= 1 then
Check_Arg_Count (2);
Check_No_Identifier (Arg2);
end if;
-- Check that this is first line of file. We skip this test if
-- we are in syntax check only mode, since we may be dealing with
-- multiple compilation units.
if Get_Physical_Line_Number (Pragma_Sloc) /= 1
and then Num_SRef_Pragmas (Current_Source_File) = 0
and then Operating_Mode /= Check_Syntax
then
Error_Msg_N -- CODEFIX
("first % pragma must be first line of file", Pragma_Node);
raise Error_Resync;
end if;
Check_No_Identifier (Arg1);
if Arg_Count = 1 then
if Num_SRef_Pragmas (Current_Source_File) = 0 then
Error_Msg_N
("file name required for first % pragma in file",
Pragma_Node);
raise Error_Resync;
else
Fname := No_File;
end if;
-- File name present
else
Check_Arg_Is_String_Literal (Arg2);
String_To_Name_Buffer (Strval (Expression (Arg2)));
Fname := Name_Find;
if Num_SRef_Pragmas (Current_Source_File) > 0 then
if Fname /= Full_Ref_Name (Current_Source_File) then
Error_Msg_N
("file name must be same in all % pragmas", Pragma_Node);
raise Error_Resync;
end if;
end if;
end if;
if Nkind (Expression (Arg1)) /= N_Integer_Literal then
Error_Msg_N
("argument for pragma% must be integer literal",
Expression (Arg1));
raise Error_Resync;
-- OK, this source reference pragma is effective, however, we
-- ignore it if it is not in the first unit in the multiple unit
-- case. This is because the only purpose in this case is to
-- provide source pragmas for subsequent use by gnatchop.
else
if Num_Library_Units = 1 then
Register_Source_Ref_Pragma
(Fname,
Strip_Directory (Fname),
UI_To_Int (Intval (Expression (Arg1))),
Get_Physical_Line_Number (Pragma_Sloc) + 1);
end if;
end if;
end Source_Reference;
-------------------------
-- Style_Checks (GNAT) --
-------------------------
-- pragma Style_Checks (On | Off | ALL_CHECKS | STRING_LITERAL);
-- This is processed by the parser since some of the style
-- checks take place during source scanning and parsing.
when Pragma_Style_Checks => Style_Checks : declare
A : Node_Id;
S : String_Id;
C : Char_Code;
OK : Boolean := True;
begin
-- Two argument case is only for semantics
if Arg_Count = 2 then
null;
else
Check_Arg_Count (1);
Check_No_Identifier (Arg1);
A := Expression (Arg1);
if Nkind (A) = N_String_Literal then
S := Strval (A);
declare
Slen : constant Natural := Natural (String_Length (S));
Options : String (1 .. Slen);
J : Positive;
Ptr : Positive;
begin
J := 1;
loop
C := Get_String_Char (S, Pos (J));
if not In_Character_Range (C) then
OK := False;
Ptr := J;
exit;
else
Options (J) := Get_Character (C);
end if;
if J = Slen then
if not Ignore_Style_Checks_Pragmas then
Set_Style_Check_Options (Options, OK, Ptr);
end if;
exit;
else
J := J + 1;
end if;
end loop;
if not OK then
Error_Msg
(Style_Msg_Buf (1 .. Style_Msg_Len),
Sloc (Expression (Arg1)) + Source_Ptr (Ptr));
raise Error_Resync;
end if;
end;
elsif Nkind (A) /= N_Identifier then
OK := False;
elsif Chars (A) = Name_All_Checks then
if not Ignore_Style_Checks_Pragmas then
if GNAT_Mode then
Stylesw.Set_GNAT_Style_Check_Options;
else
Stylesw.Set_Default_Style_Check_Options;
end if;
end if;
elsif Chars (A) = Name_On then
if not Ignore_Style_Checks_Pragmas then
Style_Check := True;
end if;
elsif Chars (A) = Name_Off then
if not Ignore_Style_Checks_Pragmas then
Style_Check := False;
end if;
else
OK := False;
end if;
if not OK then
Error_Msg_N ("incorrect argument for pragma%", A);
raise Error_Resync;
end if;
end if;
end Style_Checks;
-------------------------
-- Suppress_All (GNAT) --
-------------------------
-- pragma Suppress_All
-- This is a rather odd pragma, because other compilers allow it in
-- strange places. DEC allows it at the end of units, and Rational
-- allows it as a program unit pragma, when it would be more natural
-- if it were a configuration pragma.
-- Since the reason we provide this pragma is for compatibility with
-- these other compilers, we want to accommodate these strange placement
-- rules, and the easiest thing is simply to allow it anywhere in a
-- unit. If this pragma appears anywhere within a unit, then the effect
-- is as though a pragma Suppress (All_Checks) had appeared as the first
-- line of the current file, i.e. as the first configuration pragma in
-- the current unit.
-- To get this effect, we set the flag Has_Pragma_Suppress_All in the
-- compilation unit node for the current source file then in the last
-- stage of parsing a file, if this flag is set, we materialize the
-- Suppress (All_Checks) pragma, marked as not coming from Source.
when Pragma_Suppress_All =>
Set_Has_Pragma_Suppress_All (Cunit (Current_Source_Unit));
----------------------
-- Warning_As_Error --
----------------------
-- pragma Warning_As_Error (static_string_EXPRESSION);
-- Further processing is done in Sem_Prag
when Pragma_Warning_As_Error =>
Check_Arg_Count (1);
Check_Arg_Is_String_Literal (Arg1);
Warnings_As_Errors_Count := Warnings_As_Errors_Count + 1;
Warnings_As_Errors (Warnings_As_Errors_Count) :=
new String'(Acquire_Warning_Match_String (Get_Pragma_Arg (Arg1)));
---------------------
-- Warnings (GNAT) --
---------------------
-- pragma Warnings ([TOOL_NAME,] DETAILS [, REASON]);
-- DETAILS ::= On | Off
-- DETAILS ::= On | Off, local_NAME
-- DETAILS ::= static_string_EXPRESSION
-- DETAILS ::= On | Off, static_string_EXPRESSION
-- TOOL_NAME ::= GNAT | GNATprove
-- REASON ::= Reason => STRING_LITERAL {& STRING_LITERAL}
-- Note: If the first argument matches an allowed tool name, it is
-- always considered to be a tool name, even if there is a string
-- variable of that name.
-- The one argument ON/OFF case is processed by the parser, since it may
-- control parser warnings as well as semantic warnings, and in any case
-- we want to be absolutely sure that the range in the warnings table is
-- set well before any semantic analysis is performed. Note that we
-- ignore this pragma if debug flag -gnatd.i is set.
-- Also note that the "one argument" case may have two or three
-- arguments if the first one is a tool name, and/or the last one is a
-- reason argument.
when Pragma_Warnings => Warnings : declare
function First_Arg_Is_Matching_Tool_Name return Boolean;
-- Returns True if the first argument is a tool name matching the
-- current tool being run.
function Last_Arg return Node_Id;
-- Returns the last argument
function Last_Arg_Is_Reason return Boolean;
-- Returns True if the last argument is a reason argument
function Get_Reason return String_Id;
-- Analyzes Reason argument and returns corresponding String_Id
-- value, or null if there is no Reason argument, or if the
-- argument is not of the required form.
-------------------------------------
-- First_Arg_Is_Matching_Tool_Name --
-------------------------------------
function First_Arg_Is_Matching_Tool_Name return Boolean is
begin
return Nkind (Arg1) = N_Identifier
-- Return True if the tool name is GNAT, and we're not in
-- GNATprove or CodePeer mode...
and then ((Chars (Arg1) = Name_Gnat
and then not
(CodePeer_Mode or GNATprove_Mode))
-- or if the tool name is GNATprove, and we're in GNATprove
-- mode.
or else
(Chars (Arg1) = Name_Gnatprove
and then GNATprove_Mode));
end First_Arg_Is_Matching_Tool_Name;
----------------
-- Get_Reason --
----------------
function Get_Reason return String_Id is
Arg : constant Node_Id := Last_Arg;
begin
if Last_Arg_Is_Reason then
Start_String;
Get_Reason_String (Expression (Arg));
return End_String;
else
return Null_String_Id;
end if;
end Get_Reason;
--------------
-- Last_Arg --
--------------
function Last_Arg return Node_Id is
Last_Arg : Node_Id;
begin
if Arg_Count = 1 then
Last_Arg := Arg1;
elsif Arg_Count = 2 then
Last_Arg := Arg2;
elsif Arg_Count = 3 then
Last_Arg := Arg3;
elsif Arg_Count = 4 then
Last_Arg := Next (Arg3);
-- Illegal case, error issued in semantic analysis
else
Last_Arg := Empty;
end if;
return Last_Arg;
end Last_Arg;
------------------------
-- Last_Arg_Is_Reason --
------------------------
function Last_Arg_Is_Reason return Boolean is
Arg : constant Node_Id := Last_Arg;
begin
return Nkind (Arg) in N_Has_Chars
and then Chars (Arg) = Name_Reason;
end Last_Arg_Is_Reason;
The_Arg : Node_Id; -- On/Off argument
Argx : Node_Id;
-- Start of processing for Warnings
begin
if not Debug_Flag_Dot_I
and then (Arg_Count = 1
or else (Arg_Count = 2
and then (First_Arg_Is_Matching_Tool_Name
or else
Last_Arg_Is_Reason))
or else (Arg_Count = 3
and then First_Arg_Is_Matching_Tool_Name
and then Last_Arg_Is_Reason))
then
if First_Arg_Is_Matching_Tool_Name then
The_Arg := Arg2;
else
The_Arg := Arg1;
end if;
Check_No_Identifier (The_Arg);
Argx := Expression (The_Arg);
if Nkind (Argx) = N_Identifier then
if Chars (Argx) = Name_On then
Set_Warnings_Mode_On (Pragma_Sloc);
elsif Chars (Argx) = Name_Off then
Set_Warnings_Mode_Off (Pragma_Sloc, Get_Reason);
end if;
end if;
end if;
end Warnings;
-----------------------------
-- Wide_Character_Encoding --
-----------------------------
-- pragma Wide_Character_Encoding (IDENTIFIER | CHARACTER_LITERAL);
-- This is processed by the parser, since the scanner is affected
when Pragma_Wide_Character_Encoding => Wide_Character_Encoding : declare
A : Node_Id;
begin
Check_Arg_Count (1);
Check_No_Identifier (Arg1);
A := Expression (Arg1);
if Nkind (A) = N_Identifier then
Get_Name_String (Chars (A));
Wide_Character_Encoding_Method :=
Get_WC_Encoding_Method (Name_Buffer (1 .. Name_Len));
elsif Nkind (A) = N_Character_Literal then
declare
R : constant Char_Code :=
Char_Code (UI_To_Int (Char_Literal_Value (A)));
begin
if In_Character_Range (R) then
Wide_Character_Encoding_Method :=
Get_WC_Encoding_Method (Get_Character (R));
else
raise Constraint_Error;
end if;
end;
else
raise Constraint_Error;
end if;
Upper_Half_Encoding :=
Wide_Character_Encoding_Method in
WC_Upper_Half_Encoding_Method;
exception
when Constraint_Error =>
Error_Msg_N ("invalid argument for pragma%", Arg1);
end Wide_Character_Encoding;
-----------------------
-- All Other Pragmas --
-----------------------
-- For all other pragmas, checking and processing is handled entirely in
-- Sem_Prag, and no further checking is done by Par.
when Pragma_Abort_Defer
| Pragma_Abstract_State
| Pragma_Aggregate_Individually_Assign
| Pragma_All_Calls_Remote
| Pragma_Allow_Integer_Address
| Pragma_Annotate
| Pragma_Assert
| Pragma_Assert_And_Cut
| Pragma_Assertion_Policy
| Pragma_Assume
| Pragma_Assume_No_Invalid_Values
| Pragma_Async_Readers
| Pragma_Async_Writers
| Pragma_Asynchronous
| Pragma_Atomic
| Pragma_Atomic_Components
| Pragma_Attach_Handler
| Pragma_Attribute_Definition
| Pragma_CPP_Class
| Pragma_CPP_Constructor
| Pragma_CPP_Virtual
| Pragma_CPP_Vtable
| Pragma_CPU
| Pragma_CUDA_Device
| Pragma_CUDA_Execute
| Pragma_CUDA_Global
| Pragma_C_Pass_By_Copy
| Pragma_Check
| Pragma_Check_Float_Overflow
| Pragma_Check_Name
| Pragma_Check_Policy
| Pragma_Comment
| Pragma_Common_Object
| Pragma_Compile_Time_Error
| Pragma_Compile_Time_Warning
| Pragma_Complete_Representation
| Pragma_Complex_Representation
| Pragma_Component_Alignment
| Pragma_Constant_After_Elaboration
| Pragma_Contract_Cases
| Pragma_Controlled
| Pragma_Convention
| Pragma_Convention_Identifier
| Pragma_Deadline_Floor
| Pragma_Debug_Policy
| Pragma_Default_Initial_Condition
| Pragma_Default_Scalar_Storage_Order
| Pragma_Default_Storage_Pool
| Pragma_Depends
| Pragma_Detect_Blocking
| Pragma_Disable_Atomic_Synchronization
| Pragma_Discard_Names
| Pragma_Dispatching_Domain
| Pragma_Effective_Reads
| Pragma_Effective_Writes
| Pragma_Elaborate
| Pragma_Elaborate_All
| Pragma_Elaborate_Body
| Pragma_Elaboration_Checks
| Pragma_Eliminate
| Pragma_Enable_Atomic_Synchronization
| Pragma_Export
| Pragma_Export_Function
| Pragma_Export_Object
| Pragma_Export_Procedure
| Pragma_Export_Valued_Procedure
| Pragma_Extend_System
| Pragma_Extensions_Visible
| Pragma_External
| Pragma_External_Name_Casing
| Pragma_Fast_Math
| Pragma_Favor_Top_Level
| Pragma_Finalize_Storage_Only
| Pragma_Ghost
| Pragma_Global
| Pragma_GNAT_Annotate
| Pragma_Ident
| Pragma_Implementation_Defined
| Pragma_Implemented
| Pragma_Implicit_Packing
| Pragma_Import
| Pragma_Import_Function
| Pragma_Import_Object
| Pragma_Import_Procedure
| Pragma_Import_Valued_Procedure
| Pragma_Independent
| Pragma_Independent_Components
| Pragma_Initial_Condition
| Pragma_Initialize_Scalars
| Pragma_Initializes
| Pragma_Inline
| Pragma_Inline_Always
| Pragma_Inline_Generic
| Pragma_Inspection_Point
| Pragma_Interface
| Pragma_Interface_Name
| Pragma_Interrupt_Handler
| Pragma_Interrupt_Priority
| Pragma_Interrupt_State
| Pragma_Invariant
| Pragma_Keep_Names
| Pragma_License
| Pragma_Link_With
| Pragma_Linker_Alias
| Pragma_Linker_Constructor
| Pragma_Linker_Destructor
| Pragma_Linker_Options
| Pragma_Linker_Section
| Pragma_Lock_Free
| Pragma_Locking_Policy
| Pragma_Loop_Invariant
| Pragma_Loop_Optimize
| Pragma_Loop_Variant
| Pragma_Machine_Attribute
| Pragma_Main
| Pragma_Main_Storage
| Pragma_Max_Entry_Queue_Depth
| Pragma_Max_Entry_Queue_Length
| Pragma_Max_Queue_Length
| Pragma_Memory_Size
| Pragma_No_Body
| Pragma_No_Caching
| Pragma_No_Component_Reordering
| Pragma_No_Elaboration_Code_All
| Pragma_No_Heap_Finalization
| Pragma_No_Inline
| Pragma_No_Return
| Pragma_No_Run_Time
| Pragma_No_Strict_Aliasing
| Pragma_No_Tagged_Streams
| Pragma_Normalize_Scalars
| Pragma_Obsolescent
| Pragma_Optimize
| Pragma_Optimize_Alignment
| Pragma_Ordered
| Pragma_Overflow_Mode
| Pragma_Overriding_Renamings
| Pragma_Pack
| Pragma_Part_Of
| Pragma_Partition_Elaboration_Policy
| Pragma_Passive
| Pragma_Persistent_BSS
| Pragma_Post
| Pragma_Post_Class
| Pragma_Postcondition
| Pragma_Pre
| Pragma_Pre_Class
| Pragma_Precondition
| Pragma_Predicate
| Pragma_Predicate_Failure
| Pragma_Preelaborable_Initialization
| Pragma_Preelaborate
| Pragma_Prefix_Exception_Messages
| Pragma_Priority
| Pragma_Priority_Specific_Dispatching
| Pragma_Profile
| Pragma_Profile_Warnings
| Pragma_Propagate_Exceptions
| Pragma_Provide_Shift_Operators
| Pragma_Psect_Object
| Pragma_Pure
| Pragma_Pure_Function
| Pragma_Queuing_Policy
| Pragma_Rational
| Pragma_Ravenscar
| Pragma_Refined_Depends
| Pragma_Refined_Global
| Pragma_Refined_Post
| Pragma_Refined_State
| Pragma_Relative_Deadline
| Pragma_Remote_Access_Type
| Pragma_Remote_Call_Interface
| Pragma_Remote_Types
| Pragma_Rename_Pragma
| Pragma_Restricted_Run_Time
| Pragma_Reviewable
| Pragma_SPARK_Mode
| Pragma_Secondary_Stack_Size
| Pragma_Share_Generic
| Pragma_Shared
| Pragma_Shared_Passive
| Pragma_Short_Circuit_And_Or
| Pragma_Short_Descriptors
| Pragma_Simple_Storage_Pool_Type
| Pragma_Static_Elaboration_Desired
| Pragma_Storage_Size
| Pragma_Storage_Unit
| Pragma_Stream_Convert
| Pragma_Subtitle
| Pragma_Subprogram_Variant
| Pragma_Suppress
| Pragma_Suppress_Debug_Info
| Pragma_Suppress_Exception_Locations
| Pragma_Suppress_Initialization
| Pragma_System_Name
| Pragma_Task_Dispatching_Policy
| Pragma_Task_Info
| Pragma_Task_Name
| Pragma_Task_Storage
| Pragma_Test_Case
| Pragma_Thread_Local_Storage
| Pragma_Time_Slice
| Pragma_Title
| Pragma_Type_Invariant
| Pragma_Type_Invariant_Class
| Pragma_Unchecked_Union
| Pragma_Unevaluated_Use_Of_Old
| Pragma_Unimplemented_Unit
| Pragma_Universal_Aliasing
| Pragma_Unmodified
| Pragma_Unreferenced
| Pragma_Unreferenced_Objects
| Pragma_Unreserve_All_Interrupts
| Pragma_Unsuppress
| Pragma_Unused
| Pragma_Use_VADS_Size
| Pragma_Validity_Checks
| Pragma_Volatile
| Pragma_Volatile_Components
| Pragma_Volatile_Full_Access
| Pragma_Volatile_Function
| Pragma_Weak_External
=>
null;
--------------------
-- Unknown_Pragma --
--------------------
-- Should be impossible, since we excluded this case earlier on
when Unknown_Pragma =>
raise Program_Error;
end case;
return Pragma_Node;
--------------------
-- Error Handling --
--------------------
exception
when Error_Resync =>
return Error;
end Prag;
|