blob: 551173066a0f68efccf151c52aa249711f7971e6 [file] [log] [blame]
------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- P A R . C H 1 0 --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2015, 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. --
-- --
------------------------------------------------------------------------------
pragma Style_Checks (All_Checks);
-- Turn off subprogram body ordering check. Subprograms are in order
-- by RM section rather than alphabetical
with Fname.UF; use Fname.UF;
with Uname; use Uname;
separate (Par)
package body Ch10 is
-- Local functions, used only in this chapter
function P_Context_Clause return List_Id;
function P_Subunit return Node_Id;
function Set_Location return Source_Ptr;
-- The current compilation unit starts with Token at Token_Ptr. This
-- function determines the corresponding source location for the start
-- of the unit, including any preceding comment lines.
procedure Unit_Display
(Cunit : Node_Id;
Loc : Source_Ptr;
SR_Present : Boolean);
-- This procedure is used to generate a line of output for a unit in
-- the source program. Cunit is the node for the compilation unit, and
-- Loc is the source location for the start of the unit in the source
-- file (which is not necessarily the Sloc of the Cunit node). This
-- output is written to the standard output file for use by gnatchop.
procedure Unit_Location (Sind : Source_File_Index; Loc : Source_Ptr);
-- This routine has the same calling sequence as Unit_Display, but
-- it outputs only the line number and offset of the location, Loc,
-- using Cunit to obtain the proper source file index.
-------------------------
-- 10.1.1 Compilation --
-------------------------
-- COMPILATION ::= {COMPILATION_UNIT}
-- There is no specific parsing routine for a compilation, since we only
-- permit a single compilation in a source file, so there is no explicit
-- occurrence of compilations as such (our representation of a compilation
-- is a series of separate source files).
------------------------------
-- 10.1.1 Compilation unit --
------------------------------
-- COMPILATION_UNIT ::=
-- CONTEXT_CLAUSE LIBRARY_ITEM
-- | CONTEXT_CLAUSE SUBUNIT
-- LIBRARY_ITEM ::=
-- private LIBRARY_UNIT_DECLARATION
-- | LIBRARY_UNIT_BODY
-- | [private] LIBRARY_UNIT_RENAMING_DECLARATION
-- LIBRARY_UNIT_DECLARATION ::=
-- SUBPROGRAM_DECLARATION | PACKAGE_DECLARATION
-- | GENERIC_DECLARATION | GENERIC_INSTANTIATION
-- LIBRARY_UNIT_RENAMING_DECLARATION ::=
-- PACKAGE_RENAMING_DECLARATION
-- | GENERIC_RENAMING_DECLARATION
-- | SUBPROGRAM_RENAMING_DECLARATION
-- LIBRARY_UNIT_BODY ::= SUBPROGRAM_BODY | PACKAGE_BODY
-- Error recovery: cannot raise Error_Resync. If an error occurs, tokens
-- are skipped up to the next possible beginning of a compilation unit.
-- Note: if only configuration pragmas are found, Empty is returned
-- Note: in syntax-only mode, it is possible for P_Compilation_Unit
-- to return strange things that are not really compilation units.
-- This is done to help out gnatchop when it is faced with nonsense.
function P_Compilation_Unit return Node_Id is
Scan_State : Saved_Scan_State;
Body_Node : Node_Id;
Specification_Node : Node_Id;
Unit_Node : Node_Id;
Comp_Unit_Node : Node_Id;
Name_Node : Node_Id;
Item : Node_Id;
Private_Sloc : Source_Ptr := No_Location;
Config_Pragmas : List_Id;
P : Node_Id;
SR_Present : Boolean;
No_Body : Boolean;
Cunit_Error_Flag : Boolean := False;
-- This flag is set True if we have to scan for a compilation unit
-- token. It is used to ensure clean termination in such cases by
-- not insisting on being at the end of file, and, in the syntax only
-- case by not scanning for additional compilation units.
Cunit_Location : Source_Ptr;
-- Location of unit for unit identification output (List_Unit option)
begin
Num_Library_Units := Num_Library_Units + 1;
-- Set location of the compilation unit if unit list option set
-- and we are in syntax check only mode
if List_Units and then Operating_Mode = Check_Syntax then
Cunit_Location := Set_Location;
else
Cunit_Location := No_Location;
end if;
-- Deal with initial pragmas
Config_Pragmas := No_List;
-- If we have an initial Source_Reference pragma, then remember the fact
-- to generate an NR parameter in the output line.
SR_Present := False;
-- If we see a pragma No_Body, remember not to complain about no body
No_Body := False;
if Token = Tok_Pragma then
Save_Scan_State (Scan_State);
Item := P_Pragma;
if Item = Error
or else Pragma_Name (Item) /= Name_Source_Reference
then
Restore_Scan_State (Scan_State);
else
SR_Present := True;
-- If first unit, record the file name for gnatchop use
if Operating_Mode = Check_Syntax
and then List_Units
and then Num_Library_Units = 1
then
Write_Str ("Source_Reference pragma for file """);
Write_Name (Full_Ref_Name (Current_Source_File));
Write_Char ('"');
Write_Eol;
end if;
Config_Pragmas := New_List (Item);
end if;
end if;
-- Scan out any configuration pragmas
while Token = Tok_Pragma loop
Save_Scan_State (Scan_State);
Item := P_Pragma;
if Item /= Error and then Pragma_Name (Item) = Name_No_Body then
No_Body := True;
end if;
if Item = Error
or else not Is_Configuration_Pragma_Name (Pragma_Name (Item))
then
Restore_Scan_State (Scan_State);
exit;
end if;
if Config_Pragmas = No_List then
Config_Pragmas := Empty_List;
if Operating_Mode = Check_Syntax and then List_Units then
Write_Str ("Configuration pragmas at");
Unit_Location (Current_Source_File, Cunit_Location);
Write_Eol;
end if;
end if;
Append (Item, Config_Pragmas);
Cunit_Location := Set_Location;
end loop;
-- Establish compilation unit node and scan context items
Comp_Unit_Node := New_Node (N_Compilation_Unit, No_Location);
Set_Cunit (Current_Source_Unit, Comp_Unit_Node);
Set_Context_Items (Comp_Unit_Node, P_Context_Clause);
Set_Aux_Decls_Node
(Comp_Unit_Node, New_Node (N_Compilation_Unit_Aux, No_Location));
if Present (Config_Pragmas) then
-- Check for case of only configuration pragmas present
if Token = Tok_EOF
and then Is_Empty_List (Context_Items (Comp_Unit_Node))
then
if Operating_Mode = Check_Syntax then
return Empty;
else
Item := First (Config_Pragmas);
Error_Msg_N
("cannot compile configuration pragmas with gcc!", Item);
Error_Msg_N
("\use gnatchop -c to process configuration pragmas!", Item);
raise Unrecoverable_Error;
end if;
-- Otherwise configuration pragmas are simply prepended to the
-- context of the current unit.
else
Append_List (Context_Items (Comp_Unit_Node), Config_Pragmas);
Set_Context_Items (Comp_Unit_Node, Config_Pragmas);
end if;
end if;
-- Check for PRIVATE. Note that for the moment we allow this in
-- Ada_83 mode, since we do not yet know if we are compiling a
-- predefined unit, and if we are then it would be allowed anyway.
if Token = Tok_Private then
Private_Sloc := Token_Ptr;
Set_Keyword_Casing (Current_Source_File, Determine_Token_Casing);
if Style_Check then
Style.Check_Indentation;
end if;
Save_Scan_State (Scan_State); -- at PRIVATE
Scan; -- past PRIVATE
if Token = Tok_Separate then
Error_Msg_SP ("cannot have private subunits!");
elsif Token = Tok_Package then
Scan; -- past PACKAGE
if Token = Tok_Body then
Restore_Scan_State (Scan_State); -- to PRIVATE
Error_Msg_SC ("cannot have private package body!");
Scan; -- ignore PRIVATE
else
Restore_Scan_State (Scan_State); -- to PRIVATE
Scan; -- past PRIVATE
Set_Private_Present (Comp_Unit_Node, True);
end if;
elsif Token = Tok_Procedure
or else Token = Tok_Function
or else Token = Tok_Generic
then
Set_Private_Present (Comp_Unit_Node, True);
end if;
end if;
-- Loop to find our way to a compilation unit token
loop
exit when Token in Token_Class_Cunit and then Token /= Tok_With;
exit when Bad_Spelling_Of (Tok_Package)
or else Bad_Spelling_Of (Tok_Function)
or else Bad_Spelling_Of (Tok_Generic)
or else Bad_Spelling_Of (Tok_Separate)
or else Bad_Spelling_Of (Tok_Procedure);
-- Allow task and protected for nice error recovery purposes
exit when Token = Tok_Task
or else Token = Tok_Protected;
if Token = Tok_With then
Error_Msg_SC ("misplaced WITH");
Append_List (P_Context_Clause, Context_Items (Comp_Unit_Node));
elsif Bad_Spelling_Of (Tok_With) then
Append_List (P_Context_Clause, Context_Items (Comp_Unit_Node));
else
if Operating_Mode = Check_Syntax and then Token = Tok_EOF then
-- Do not complain if there is a pragma No_Body
if not No_Body then
Error_Msg_SC ("??file contains no compilation units");
end if;
else
Error_Msg_SC ("compilation unit expected");
Cunit_Error_Flag := True;
Resync_Cunit;
end if;
-- If we are at an end of file, then just quit, the above error
-- message was complaint enough.
if Token = Tok_EOF then
return Error;
end if;
end if;
end loop;
-- We have a compilation unit token, so that's a reasonable choice for
-- determining the standard casing convention used for keywords in case
-- it hasn't already been done on seeing a WITH or PRIVATE.
Set_Keyword_Casing (Current_Source_File, Determine_Token_Casing);
if Style_Check then
Style.Check_Indentation;
end if;
-- Remaining processing depends on particular type of compilation unit
if Token = Tok_Package then
-- A common error is to omit the body keyword after package. We can
-- often diagnose this early on (before getting loads of errors from
-- contained subprogram bodies), by knowing that the file we
-- are compiling has a name that requires a body to be found.
Save_Scan_State (Scan_State);
Scan; -- past Package keyword
if Token /= Tok_Body
and then
Get_Expected_Unit_Type
(File_Name (Current_Source_File)) = Expect_Body
then
Error_Msg_BC -- CODEFIX
("keyword BODY expected here '[see file name']");
Restore_Scan_State (Scan_State);
Set_Unit (Comp_Unit_Node, P_Package (Pf_Pbod_Pexp));
else
Restore_Scan_State (Scan_State);
Set_Unit (Comp_Unit_Node, P_Package (Pf_Decl_Gins_Pbod_Rnam_Pexp));
end if;
elsif Token = Tok_Generic then
Set_Unit (Comp_Unit_Node, P_Generic);
elsif Token = Tok_Separate then
Set_Unit (Comp_Unit_Node, P_Subunit);
elsif Token = Tok_Function
or else Token = Tok_Not
or else Token = Tok_Overriding
or else Token = Tok_Procedure
then
Set_Unit (Comp_Unit_Node, P_Subprogram (Pf_Decl_Gins_Pbod_Rnam_Pexp));
-- A little bit of an error recovery check here. If we just scanned
-- a subprogram declaration (as indicated by an SIS entry being
-- active), then if the following token is BEGIN or an identifier,
-- or a token which can reasonably start a declaration but cannot
-- start a compilation unit, then we assume that the semicolon in
-- the declaration should have been IS.
if SIS_Entry_Active then
if Token = Tok_Begin
or else Token = Tok_Identifier
or else Token in Token_Class_Deckn
then
Push_Scope_Stack;
Scope.Table (Scope.Last).Etyp := E_Name;
Scope.Table (Scope.Last).Sloc := SIS_Sloc;
Scope.Table (Scope.Last).Ecol := SIS_Ecol;
Scope.Table (Scope.Last).Lreq := False;
SIS_Entry_Active := False;
-- If we had a missing semicolon in the declaration, then
-- change the message to from <missing ";"> to <missing "is">
if SIS_Missing_Semicolon_Message /= No_Error_Msg then
Change_Error_Text -- Replace: "missing "";"" "
(SIS_Missing_Semicolon_Message, "missing IS");
-- Otherwise we saved the semicolon position, so complain
else
Error_Msg -- CODEFIX
(""";"" should be IS", SIS_Semicolon_Sloc);
end if;
Body_Node := Unit (Comp_Unit_Node);
Specification_Node := Specification (Body_Node);
Change_Node (Body_Node, N_Subprogram_Body);
Set_Specification (Body_Node, Specification_Node);
Parse_Decls_Begin_End (Body_Node);
Set_Unit (Comp_Unit_Node, Body_Node);
end if;
-- If we scanned a subprogram body, make sure we did not have private
elsif Private_Sloc /= No_Location
and then
Nkind (Unit (Comp_Unit_Node)) not in N_Subprogram_Instantiation
and then
Nkind (Unit (Comp_Unit_Node)) /= N_Subprogram_Renaming_Declaration
then
Error_Msg ("cannot have private subprogram body", Private_Sloc);
-- P_Subprogram can yield an abstract subprogram, but this cannot
-- be a compilation unit. Treat as a subprogram declaration.
elsif
Nkind (Unit (Comp_Unit_Node)) = N_Abstract_Subprogram_Declaration
then
Error_Msg_N
("compilation unit cannot be abstract subprogram",
Unit (Comp_Unit_Node));
Unit_Node :=
New_Node (N_Subprogram_Declaration, Sloc (Comp_Unit_Node));
Set_Specification (Unit_Node,
Specification (Unit (Comp_Unit_Node)));
Set_Unit (Comp_Unit_Node, Unit_Node);
end if;
-- Otherwise we have TASK. This is not really an acceptable token,
-- but we accept it to improve error recovery.
elsif Token = Tok_Task then
Scan; -- Past TASK
if Token = Tok_Type then
Error_Msg_SP
("task type cannot be used as compilation unit");
else
Error_Msg_SP
("task declaration cannot be used as compilation unit");
end if;
-- If in check syntax mode, accept the task anyway. This is done
-- particularly to improve the behavior of GNATCHOP in this case.
if Operating_Mode = Check_Syntax then
Set_Unit (Comp_Unit_Node, P_Task);
-- If not in syntax only mode, treat this as horrible error
else
Cunit_Error_Flag := True;
return Error;
end if;
else pragma Assert (Token = Tok_Protected);
Scan; -- Past PROTECTED
if Token = Tok_Type then
Error_Msg_SP
("protected type cannot be used as compilation unit");
else
Error_Msg_SP
("protected declaration cannot be used as compilation unit");
end if;
-- If in check syntax mode, accept protected anyway. This is done
-- particularly to improve the behavior of GNATCHOP in this case.
if Operating_Mode = Check_Syntax then
Set_Unit (Comp_Unit_Node, P_Protected);
-- If not in syntax only mode, treat this as horrible error
else
Cunit_Error_Flag := True;
return Error;
end if;
end if;
-- Here is where locate the compilation unit entity. This is a little
-- tricky, since it is buried in various places.
Unit_Node := Unit (Comp_Unit_Node);
-- Another error from which it is hard to recover
if Nkind_In (Unit_Node, N_Subprogram_Body_Stub, N_Package_Body_Stub) then
Cunit_Error_Flag := True;
return Error;
end if;
-- Only try this if we got an OK unit
if Unit_Node /= Error then
if Nkind (Unit_Node) = N_Subunit then
Unit_Node := Proper_Body (Unit_Node);
end if;
if Nkind (Unit_Node) in N_Generic_Declaration then
Unit_Node := Specification (Unit_Node);
end if;
if Nkind_In (Unit_Node, N_Package_Declaration,
N_Subprogram_Declaration,
N_Subprogram_Body,
N_Subprogram_Renaming_Declaration)
then
Unit_Node := Specification (Unit_Node);
elsif Nkind (Unit_Node) = N_Subprogram_Renaming_Declaration then
if Ada_Version = Ada_83 then
Error_Msg_N
("(Ada 83) library unit renaming not allowed", Unit_Node);
end if;
end if;
if Nkind_In (Unit_Node, N_Task_Body,
N_Protected_Body,
N_Task_Type_Declaration,
N_Protected_Type_Declaration,
N_Single_Task_Declaration,
N_Single_Protected_Declaration)
then
Name_Node := Defining_Identifier (Unit_Node);
elsif Nkind_In (Unit_Node, N_Function_Instantiation,
N_Function_Specification,
N_Generic_Function_Renaming_Declaration,
N_Generic_Package_Renaming_Declaration,
N_Generic_Procedure_Renaming_Declaration)
or else
Nkind_In (Unit_Node, N_Package_Body,
N_Package_Instantiation,
N_Package_Renaming_Declaration,
N_Package_Specification,
N_Procedure_Instantiation,
N_Procedure_Specification)
then
Name_Node := Defining_Unit_Name (Unit_Node);
elsif Nkind (Unit_Node) = N_Expression_Function then
Error_Msg_SP
("expression function cannot be used as compilation unit");
return Comp_Unit_Node;
-- Anything else is a serious error, abandon scan
else
raise Error_Resync;
end if;
Set_Sloc (Comp_Unit_Node, Sloc (Name_Node));
Set_Sloc (Aux_Decls_Node (Comp_Unit_Node), Sloc (Name_Node));
-- Set Entity field in file table. Easier now that we have name.
-- Note that this is also skipped if we had a bad unit
if Nkind (Name_Node) = N_Defining_Program_Unit_Name then
Set_Cunit_Entity
(Current_Source_Unit, Defining_Identifier (Name_Node));
else
Set_Cunit_Entity (Current_Source_Unit, Name_Node);
end if;
Set_Unit_Name
(Current_Source_Unit, Get_Unit_Name (Unit (Comp_Unit_Node)));
-- If we had a bad unit, make sure the fatal flag is set in the file
-- table entry, since this is surely a fatal error and also set our
-- flag to inhibit the requirement that we be at end of file.
else
Cunit_Error_Flag := True;
Set_Fatal_Error (Current_Source_Unit, Error_Detected);
end if;
-- Clear away any missing semicolon indication, we are done with that
-- unit, so what's done is done, and we don't want anything hanging
-- around from the attempt to parse it.
SIS_Entry_Active := False;
-- Scan out pragmas after unit
while Token = Tok_Pragma loop
Save_Scan_State (Scan_State);
-- If we are in syntax scan mode allowing multiple units, then start
-- the next unit if we encounter a configuration pragma, or a source
-- reference pragma. We take care not to actually scan the pragma in
-- this case (we don't want it to take effect for the current unit).
if Operating_Mode = Check_Syntax then
Scan; -- past Pragma
if Token = Tok_Identifier
and then
(Is_Configuration_Pragma_Name (Token_Name)
or else Token_Name = Name_Source_Reference)
then
Restore_Scan_State (Scan_State); -- to Pragma
exit;
end if;
end if;
-- Otherwise eat the pragma, it definitely belongs with the
-- current unit, and not with the following unit.
Restore_Scan_State (Scan_State); -- to Pragma
P := P_Pragma;
if No (Pragmas_After (Aux_Decls_Node (Comp_Unit_Node))) then
Set_Pragmas_After
(Aux_Decls_Node (Comp_Unit_Node), New_List);
end if;
Append (P, Pragmas_After (Aux_Decls_Node (Comp_Unit_Node)));
end loop;
-- Cancel effect of any outstanding pragma Warnings (Off)
Set_Warnings_Mode_On (Scan_Ptr);
-- Ada 83 error checks
if Ada_Version = Ada_83 then
-- Check we did not with any child units
Item := First (Context_Items (Comp_Unit_Node));
while Present (Item) loop
if Nkind (Item) = N_With_Clause
and then Nkind (Name (Item)) /= N_Identifier
then
Error_Msg_N ("(Ada 83) child units not allowed", Item);
end if;
Next (Item);
end loop;
-- Check that we did not have a PRIVATE keyword present
if Private_Present (Comp_Unit_Node) then
Error_Msg
("(Ada 83) private units not allowed", Private_Sloc);
end if;
end if;
-- If no serious error, then output possible unit information line
-- for gnatchop if we are in syntax only, list units mode.
if not Cunit_Error_Flag
and then List_Units
and then Operating_Mode = Check_Syntax
then
Unit_Display (Comp_Unit_Node, Cunit_Location, SR_Present);
end if;
-- And now we should be at the end of file
if Token /= Tok_EOF then
-- If we already had to scan for a compilation unit, then don't
-- give any further error message, since it just seems to make
-- things worse, and we already gave a serious error message.
if Cunit_Error_Flag then
null;
-- If we are in check syntax mode, then we allow multiple units
-- so we just return with Token not set to Tok_EOF and no message.
elsif Operating_Mode = Check_Syntax then
return Comp_Unit_Node;
-- We also allow multiple units if we are in multiple unit mode
elsif Multiple_Unit_Index /= 0 then
-- Skip tokens to end of file, so that the -gnatl listing
-- will be complete in this situation, but no need to parse
-- the remaining units; no style checking either.
declare
Save_Style_Check : constant Boolean := Style_Check;
begin
Style_Check := False;
while Token /= Tok_EOF loop
Scan;
end loop;
Style_Check := Save_Style_Check;
end;
return Comp_Unit_Node;
-- Otherwise we have an error. We suppress the error message
-- if we already had a fatal error, since this stops junk
-- cascaded messages in some situations.
else
if Fatal_Error (Current_Source_Unit) /= Error_Detected then
if Token in Token_Class_Cunit then
Error_Msg_SC
("end of file expected, " &
"file can have only one compilation unit");
else
Error_Msg_SC ("end of file expected");
end if;
end if;
end if;
-- Skip tokens to end of file, so that the -gnatl listing
-- will be complete in this situation, but no error checking
-- other than that provided at the token level.
while Token /= Tok_EOF loop
Scan;
end loop;
return Error;
-- Normal return (we were at the end of file as expected)
else
return Comp_Unit_Node;
end if;
exception
-- An error resync is a serious bomb, so indicate result unit no good
when Error_Resync =>
Set_Fatal_Error (Current_Source_Unit, Error_Detected);
return Error;
end P_Compilation_Unit;
--------------------------
-- 10.1.1 Library Item --
--------------------------
-- Parsed by P_Compilation_Unit (10.1.1)
--------------------------------------
-- 10.1.1 Library Unit Declaration --
--------------------------------------
-- Parsed by P_Compilation_Unit (10.1.1)
------------------------------------------------
-- 10.1.1 Library Unit Renaming Declaration --
------------------------------------------------
-- Parsed by P_Compilation_Unit (10.1.1)
-------------------------------
-- 10.1.1 Library Unit Body --
-------------------------------
-- Parsed by P_Compilation_Unit (10.1.1)
------------------------------
-- 10.1.1 Parent Unit Name --
------------------------------
-- Parsed (as a name) by its parent construct
----------------------------
-- 10.1.2 Context Clause --
----------------------------
-- CONTEXT_CLAUSE ::= {CONTEXT_ITEM}
-- CONTEXT_ITEM ::= WITH_CLAUSE | USE_CLAUSE | WITH_TYPE_CLAUSE
-- WITH_CLAUSE ::=
-- [LIMITED] [PRIVATE] with library_unit_NAME {,library_unit_NAME};
-- Note: the two qualifiers are Ada 2005 extensions.
-- WITH_TYPE_CLAUSE ::=
-- with type type_NAME is access; | with type type_NAME is tagged;
-- Note: this form is obsolete (old GNAT extension).
-- Error recovery: Cannot raise Error_Resync
function P_Context_Clause return List_Id is
Item_List : List_Id;
Has_Limited : Boolean := False;
Has_Private : Boolean := False;
Scan_State : Saved_Scan_State;
With_Node : Node_Id;
First_Flag : Boolean;
begin
Item_List := New_List;
-- Get keyword casing from WITH keyword in case not set yet
if Token = Tok_With then
Set_Keyword_Casing (Current_Source_File, Determine_Token_Casing);
end if;
-- Loop through context items
loop
if Style_Check then
Style.Check_Indentation;
end if;
-- Gather any pragmas appearing in the context clause
P_Pragmas_Opt (Item_List);
-- Processing for WITH clause
-- Ada 2005 (AI-50217, AI-262): First check for LIMITED WITH,
-- PRIVATE WITH, or both.
if Token = Tok_Limited then
Has_Limited := True;
Has_Private := False;
Scan; -- past LIMITED
-- In the context, LIMITED can only appear in a with_clause
if Token = Tok_Private then
Has_Private := True;
Scan; -- past PRIVATE
end if;
if Token /= Tok_With then
Error_Msg_SC -- CODEFIX
("unexpected LIMITED ignored");
end if;
if Ada_Version < Ada_2005 then
Error_Msg_SP ("LIMITED WITH is an Ada 2005 extension");
Error_Msg_SP
("\unit must be compiled with -gnat05 switch");
end if;
elsif Token = Tok_Private then
Has_Limited := False;
Has_Private := True;
Save_Scan_State (Scan_State);
Scan; -- past PRIVATE
if Token /= Tok_With then
-- Keyword is beginning of private child unit
Restore_Scan_State (Scan_State); -- to PRIVATE
return Item_List;
elsif Ada_Version < Ada_2005 then
Error_Msg_SP ("`PRIVATE WITH` is an Ada 2005 extension");
Error_Msg_SP
("\unit must be compiled with -gnat05 switch");
end if;
else
Has_Limited := False;
Has_Private := False;
end if;
if Token = Tok_With then
Scan; -- past WITH
if Token = Tok_Type then
-- WITH TYPE is an obsolete GNAT specific extension
Error_Msg_SP ("`WITH TYPE` is an obsolete 'G'N'A'T extension");
Error_Msg_SP ("\use Ada 2005 `LIMITED WITH` clause instead");
Scan; -- past TYPE
T_Is;
if Token = Tok_Tagged then
Scan;
elsif Token = Tok_Access then
Scan;
else
Error_Msg_SC ("expect tagged or access qualifier");
end if;
TF_Semicolon;
else
First_Flag := True;
-- Loop through names in one with clause, generating a separate
-- N_With_Clause node for each name encountered.
loop
With_Node := New_Node (N_With_Clause, Token_Ptr);
Append (With_Node, Item_List);
-- Note that we allow with'ing of child units, even in
-- Ada 83 mode, since presumably if this is not desired,
-- then the compilation of the child unit itself is the
-- place where such an "error" should be caught.
Set_Name (With_Node, P_Qualified_Simple_Name);
if Name (With_Node) = Error then
Remove (With_Node);
end if;
Set_First_Name (With_Node, First_Flag);
Set_Limited_Present (With_Node, Has_Limited);
Set_Private_Present (With_Node, Has_Private);
First_Flag := False;
-- All done if no comma
exit when Token /= Tok_Comma;
-- If comma is followed by compilation unit token
-- or by USE, or PRAGMA, then it should have been a
-- semicolon after all
Save_Scan_State (Scan_State);
Scan; -- past comma
if Token in Token_Class_Cunit
or else Token = Tok_Use
or else Token = Tok_Pragma
then
Restore_Scan_State (Scan_State);
exit;
end if;
end loop;
Set_Last_Name (With_Node, True);
TF_Semicolon;
end if;
-- Processing for USE clause
elsif Token = Tok_Use then
Append (P_Use_Clause, Item_List);
-- Anything else is end of context clause
else
exit;
end if;
end loop;
return Item_List;
end P_Context_Clause;
--------------------------
-- 10.1.2 Context Item --
--------------------------
-- Parsed by P_Context_Clause (10.1.2)
-------------------------
-- 10.1.2 With Clause --
-------------------------
-- Parsed by P_Context_Clause (10.1.2)
-----------------------
-- 10.1.3 Body Stub --
-----------------------
-- Subprogram stub parsed by P_Subprogram (6.1)
-- Package stub parsed by P_Package (7.1)
-- Task stub parsed by P_Task (9.1)
-- Protected stub parsed by P_Protected (9.4)
----------------------------------
-- 10.1.3 Subprogram Body Stub --
----------------------------------
-- Parsed by P_Subprogram (6.1)
-------------------------------
-- 10.1.3 Package Body Stub --
-------------------------------
-- Parsed by P_Package (7.1)
----------------------------
-- 10.1.3 Task Body Stub --
----------------------------
-- Parsed by P_Task (9.1)
---------------------------------
-- 10.1.3 Protected Body Stub --
---------------------------------
-- Parsed by P_Protected (9.4)
---------------------
-- 10.1.3 Subunit --
---------------------
-- SUBUNIT ::= separate (PARENT_UNIT_NAME) PROPER_BODY
-- PARENT_UNIT_NAME ::= NAME
-- The caller has checked that the initial token is SEPARATE
-- Error recovery: cannot raise Error_Resync
function P_Subunit return Node_Id is
Subunit_Node : Node_Id;
Body_Node : Node_Id;
begin
Subunit_Node := New_Node (N_Subunit, Token_Ptr);
Body_Node := Error; -- in case no good body found
Scan; -- past SEPARATE;
U_Left_Paren;
Set_Name (Subunit_Node, P_Qualified_Simple_Name);
U_Right_Paren;
Ignore (Tok_Semicolon);
if Token = Tok_Function
or else Token = Tok_Not
or else Token = Tok_Overriding
or else Token = Tok_Procedure
then
Body_Node := P_Subprogram (Pf_Pbod_Pexp);
elsif Token = Tok_Package then
Body_Node := P_Package (Pf_Pbod_Pexp);
elsif Token = Tok_Protected then
Scan; -- past PROTECTED
if Token = Tok_Body then
Body_Node := P_Protected;
else
Error_Msg_AP ("BODY expected");
return Error;
end if;
elsif Token = Tok_Task then
Scan; -- past TASK
if Token = Tok_Body then
Body_Node := P_Task;
else
Error_Msg_AP ("BODY expected");
return Error;
end if;
else
Error_Msg_SC ("proper body expected");
return Error;
end if;
Set_Proper_Body (Subunit_Node, Body_Node);
return Subunit_Node;
end P_Subunit;
------------------
-- Set_Location --
------------------
function Set_Location return Source_Ptr is
Physical : Boolean;
Loc : Source_Ptr;
Scan_State : Saved_Scan_State;
begin
-- A special check. If the first token is pragma, and this is a
-- Source_Reference pragma, then do NOT eat previous comments, since
-- the Source_Reference pragma is required to be the first line in
-- the source file.
if Token = Tok_Pragma then
Save_Scan_State (Scan_State);
Scan; -- past Pragma
if Token = Tok_Identifier
and then Token_Name = Name_Source_Reference
then
Restore_Scan_State (Scan_State);
return Token_Ptr;
end if;
Restore_Scan_State (Scan_State);
end if;
-- Otherwise acquire previous comments and blank lines
if Prev_Token = No_Token then
return Source_First (Current_Source_File);
else
Loc := Prev_Token_Ptr;
loop
exit when Loc = Token_Ptr;
-- Should we worry about UTF_32 line terminators here
if Source (Loc) in Line_Terminator then
Skip_Line_Terminators (Loc, Physical);
exit when Physical;
end if;
Loc := Loc + 1;
end loop;
return Loc;
end if;
end Set_Location;
------------------
-- Unit_Display --
------------------
-- The format of the generated line, as expected by GNATCHOP is
-- Unit {unit} line {line}, file offset {offs} [, SR], file name {file}
-- where
-- {unit} unit name with terminating (spec) or (body)
-- {line} starting line number
-- {offs} offset to start of text in file
-- {file} source file name
-- The SR parameter is present only if a source reference pragma was
-- scanned for this unit. The significance is that gnatchop should not
-- attempt to add another one.
procedure Unit_Display
(Cunit : Node_Id;
Loc : Source_Ptr;
SR_Present : Boolean)
is
Unum : constant Unit_Number_Type := Get_Cunit_Unit_Number (Cunit);
Sind : constant Source_File_Index := Source_Index (Unum);
Unam : constant Unit_Name_Type := Unit_Name (Unum);
begin
if List_Units then
Write_Str ("Unit ");
Write_Unit_Name (Unit_Name (Unum));
Unit_Location (Sind, Loc);
if SR_Present then
Write_Str (", SR");
end if;
Write_Str (", file name ");
Write_Name (Get_File_Name (Unam, Nkind (Unit (Cunit)) = N_Subunit));
Write_Eol;
end if;
end Unit_Display;
-------------------
-- Unit_Location --
-------------------
procedure Unit_Location (Sind : Source_File_Index; Loc : Source_Ptr) is
Line : constant Logical_Line_Number := Get_Logical_Line_Number (Loc);
-- Should the above be the physical line number ???
begin
Write_Str (" line ");
Write_Int (Int (Line));
Write_Str (", file offset ");
Write_Int (Int (Loc) - Int (Source_First (Sind)));
end Unit_Location;
end Ch10;