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Retro68/gcc/gcc/ada/ali-util.adb
Wolfgang Thaller aaf905ce07 add gcc 4.70
2012-03-28 01:13:14 +02:00

526 lines
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Ada
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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- A L I . U T I L --
-- --
-- B o d y --
-- --
-- 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- --
-- 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. --
-- --
------------------------------------------------------------------------------
with Debug; use Debug;
with Binderr; use Binderr;
with Opt; use Opt;
with Output; use Output;
with Osint; use Osint;
with Scans; use Scans;
with Scng;
with Sinput.C;
with Snames; use Snames;
with Styleg;
package body ALI.Util is
-- Empty procedures needed to instantiate Scng. Error procedures are
-- empty, because we don't want to report any errors when computing
-- a source checksum.
procedure Post_Scan;
procedure Error_Msg (Msg : String; Flag_Location : Source_Ptr);
procedure Error_Msg_S (Msg : String);
procedure Error_Msg_SC (Msg : String);
procedure Error_Msg_SP (Msg : String);
-- Instantiation of Styleg, needed to instantiate Scng
package Style is new Styleg
(Error_Msg, Error_Msg_S, Error_Msg_SC, Error_Msg_SP);
-- A Scanner is needed to get checksum of a source (procedure
-- Get_File_Checksum).
package Scanner is new Scng
(Post_Scan, Error_Msg, Error_Msg_S, Error_Msg_SC, Error_Msg_SP, Style);
type Header_Num is range 0 .. 1_000;
function Hash (F : File_Name_Type) return Header_Num;
-- Function used to compute hash of ALI file name
package Interfaces is new Simple_HTable (
Header_Num => Header_Num,
Element => Boolean,
No_Element => False,
Key => File_Name_Type,
Hash => Hash,
Equal => "=");
---------------------
-- Checksums_Match --
---------------------
function Checksums_Match (Checksum1, Checksum2 : Word) return Boolean is
begin
return Checksum1 = Checksum2 and then Checksum1 /= Checksum_Error;
end Checksums_Match;
---------------
-- Error_Msg --
---------------
procedure Error_Msg (Msg : String; Flag_Location : Source_Ptr) is
pragma Warnings (Off, Msg);
pragma Warnings (Off, Flag_Location);
begin
null;
end Error_Msg;
-----------------
-- Error_Msg_S --
-----------------
procedure Error_Msg_S (Msg : String) is
pragma Warnings (Off, Msg);
begin
null;
end Error_Msg_S;
------------------
-- Error_Msg_SC --
------------------
procedure Error_Msg_SC (Msg : String) is
pragma Warnings (Off, Msg);
begin
null;
end Error_Msg_SC;
------------------
-- Error_Msg_SP --
------------------
procedure Error_Msg_SP (Msg : String) is
pragma Warnings (Off, Msg);
begin
null;
end Error_Msg_SP;
-----------------------
-- Get_File_Checksum --
-----------------------
function Get_File_Checksum (Fname : File_Name_Type) return Word is
Full_Name : File_Name_Type;
Source_Index : Source_File_Index;
begin
Full_Name := Find_File (Fname, Osint.Source);
-- If we cannot find the file, then return an impossible checksum,
-- impossible because checksums have the high order bit zero, so
-- that checksums do not match.
if Full_Name = No_File then
return Checksum_Error;
end if;
Source_Index := Sinput.C.Load_File (Get_Name_String (Full_Name));
if Source_Index = No_Source_File then
return Checksum_Error;
end if;
Scanner.Initialize_Scanner (Source_Index);
-- Make sure that the project language reserved words are not
-- recognized as reserved words, but as identifiers. The byte info for
-- those names have been set if we are in gnatmake.
Set_Name_Table_Byte (Name_Project, 0);
Set_Name_Table_Byte (Name_Extends, 0);
Set_Name_Table_Byte (Name_External, 0);
Set_Name_Table_Byte (Name_External_As_List, 0);
-- Scan the complete file to compute its checksum
loop
Scanner.Scan;
exit when Token = Tok_EOF;
end loop;
return Scans.Checksum;
end Get_File_Checksum;
----------
-- Hash --
----------
function Hash (F : File_Name_Type) return Header_Num is
begin
return Header_Num (Int (F) rem Header_Num'Range_Length);
end Hash;
---------------------------
-- Initialize_ALI_Source --
---------------------------
procedure Initialize_ALI_Source is
begin
-- When (re)initializing ALI data structures the ALI user expects to
-- get a fresh set of data structures. Thus we first need to erase the
-- marks put in the name table by the previous set of ALI routine calls.
-- This loop is empty and harmless the first time in.
for J in Source.First .. Source.Last loop
Set_Name_Table_Info (Source.Table (J).Sfile, 0);
Source.Table (J).Source_Found := False;
end loop;
Source.Init;
Interfaces.Reset;
end Initialize_ALI_Source;
---------------
-- Post_Scan --
---------------
procedure Post_Scan is
begin
null;
end Post_Scan;
----------------------
-- Read_Withed_ALIs --
----------------------
procedure Read_Withed_ALIs
(Id : ALI_Id;
Ignore_Errors : Boolean := False)
is
Afile : File_Name_Type;
Text : Text_Buffer_Ptr;
Idread : ALI_Id;
begin
-- Process all dependent units
for U in ALIs.Table (Id).First_Unit .. ALIs.Table (Id).Last_Unit loop
for
W in Units.Table (U).First_With .. Units.Table (U).Last_With
loop
Afile := Withs.Table (W).Afile;
-- Only process if not a generic (Afile /= No_File) and if
-- file has not been processed already.
if Afile /= No_File
and then Get_Name_Table_Info (Afile) = 0
then
Text := Read_Library_Info (Afile);
-- Unless Ignore_Errors is true, return with an error if source
-- cannot be found. We used to skip this check when we did not
-- compile library generics separately, but we now always do,
-- so there is no special case here anymore.
if Text = null then
if not Ignore_Errors then
Error_Msg_File_1 := Afile;
Error_Msg_File_2 := Withs.Table (W).Sfile;
Error_Msg ("{ not found, { must be compiled");
Set_Name_Table_Info (Afile, Int (No_Unit_Id));
return;
end if;
else
-- Enter in ALIs table
Idread :=
Scan_ALI
(F => Afile,
T => Text,
Ignore_ED => False,
Err => False);
Free (Text);
if ALIs.Table (Idread).Compile_Errors
and then not Ignore_Errors
then
Error_Msg_File_1 := Withs.Table (W).Sfile;
Error_Msg ("{ had errors, must be fixed, and recompiled");
Set_Name_Table_Info (Afile, Int (No_Unit_Id));
elsif ALIs.Table (Idread).No_Object
and then not Ignore_Errors
then
Error_Msg_File_1 := Withs.Table (W).Sfile;
Error_Msg ("{ must be recompiled");
Set_Name_Table_Info (Afile, Int (No_Unit_Id));
end if;
-- If the Unit is an Interface to a Stand-Alone Library,
-- set the Interface flag in the Withs table, so that its
-- dependant are not considered for elaboration order.
if ALIs.Table (Idread).SAL_Interface then
Withs.Table (W).SAL_Interface := True;
Interface_Library_Unit := True;
-- Set the entry in the Interfaces hash table, so that
-- other units that import this unit will set the flag
-- in their entry in the Withs table.
Interfaces.Set (Afile, True);
else
-- Otherwise, recurse to get new dependents
Read_Withed_ALIs (Idread);
end if;
end if;
-- If the ALI file has already been processed and is an interface,
-- set the flag in the entry of the Withs table.
elsif Interface_Library_Unit and then Interfaces.Get (Afile) then
Withs.Table (W).SAL_Interface := True;
end if;
end loop;
end loop;
end Read_Withed_ALIs;
----------------------
-- Set_Source_Table --
----------------------
procedure Set_Source_Table (A : ALI_Id) is
F : File_Name_Type;
S : Source_Id;
Stamp : Time_Stamp_Type;
begin
Sdep_Loop : for D in
ALIs.Table (A).First_Sdep .. ALIs.Table (A).Last_Sdep
loop
F := Sdep.Table (D).Sfile;
if F /= No_File then
-- If this is the first time we are seeing this source file,
-- then make a new entry in the source table.
if Get_Name_Table_Info (F) = 0 then
Source.Increment_Last;
S := Source.Last;
Set_Name_Table_Info (F, Int (S));
Source.Table (S).Sfile := F;
Source.Table (S).All_Timestamps_Match := True;
-- Initialize checksum fields
Source.Table (S).Checksum := Sdep.Table (D).Checksum;
Source.Table (S).All_Checksums_Match := True;
-- In check source files mode, try to get time stamp from file
if Opt.Check_Source_Files then
Stamp := Source_File_Stamp (F);
-- If we got the stamp, then set the stamp in the source
-- table entry and mark it as set from the source so that
-- it does not get subsequently changed.
if Stamp (Stamp'First) /= ' ' then
Source.Table (S).Stamp := Stamp;
Source.Table (S).Source_Found := True;
-- If we could not find the file, then the stamp is set
-- from the dependency table entry (to be possibly reset
-- if we find a later stamp in subsequent processing)
else
Source.Table (S).Stamp := Sdep.Table (D).Stamp;
Source.Table (S).Source_Found := False;
-- In All_Sources mode, flag error of file not found
if Opt.All_Sources then
Error_Msg_File_1 := F;
Error_Msg ("cannot locate {");
end if;
end if;
-- First time for this source file, but Check_Source_Files
-- is off, so simply initialize the stamp from the Sdep entry
else
Source.Table (S).Source_Found := False;
Source.Table (S).Stamp := Sdep.Table (D).Stamp;
end if;
-- Here if this is not the first time for this source file,
-- so that the source table entry is already constructed.
else
S := Source_Id (Get_Name_Table_Info (F));
-- Update checksum flag
if not Checksums_Match
(Sdep.Table (D).Checksum, Source.Table (S).Checksum)
then
Source.Table (S).All_Checksums_Match := False;
end if;
-- Check for time stamp mismatch
if Sdep.Table (D).Stamp /= Source.Table (S).Stamp then
Source.Table (S).All_Timestamps_Match := False;
-- When we have a time stamp mismatch, we go look for the
-- source file even if Check_Source_Files is false, since
-- if we find it, then we can use it to resolve which of the
-- two timestamps in the ALI files is likely to be correct.
if not Check_Source_Files then
Stamp := Source_File_Stamp (F);
if Stamp (Stamp'First) /= ' ' then
Source.Table (S).Stamp := Stamp;
Source.Table (S).Source_Found := True;
end if;
end if;
-- If the stamp in the source table entry was set from the
-- source file, then we do not change it (the stamp in the
-- source file is always taken as the "right" one).
if Source.Table (S).Source_Found then
null;
-- Otherwise, we have no source file available, so we guess
-- that the later of the two timestamps is the right one.
-- Note that this guess only affects which error messages
-- are issued later on, not correct functionality.
else
if Sdep.Table (D).Stamp > Source.Table (S).Stamp then
Source.Table (S).Stamp := Sdep.Table (D).Stamp;
end if;
end if;
end if;
end if;
-- Set the checksum value in the source table
S := Source_Id (Get_Name_Table_Info (F));
Source.Table (S).Checksum := Sdep.Table (D).Checksum;
end if;
end loop Sdep_Loop;
end Set_Source_Table;
----------------------
-- Set_Source_Table --
----------------------
procedure Set_Source_Table is
begin
for A in ALIs.First .. ALIs.Last loop
Set_Source_Table (A);
end loop;
end Set_Source_Table;
-------------------------
-- Time_Stamp_Mismatch --
-------------------------
function Time_Stamp_Mismatch
(A : ALI_Id;
Read_Only : Boolean := False) return File_Name_Type
is
Src : Source_Id;
-- Source file Id for the current Sdep entry
begin
for D in ALIs.Table (A).First_Sdep .. ALIs.Table (A).Last_Sdep loop
Src := Source_Id (Get_Name_Table_Info (Sdep.Table (D).Sfile));
if Opt.Minimal_Recompilation
and then Sdep.Table (D).Stamp /= Source.Table (Src).Stamp
then
-- If minimal recompilation is in action, replace the stamp
-- of the source file in the table if checksums match.
-- ??? It is probably worth updating the ALI file with a new
-- field to avoid recomputing it each time.
if Checksums_Match
(Get_File_Checksum (Sdep.Table (D).Sfile),
Source.Table (Src).Checksum)
then
if Verbose_Mode then
Write_Str (" ");
Write_Str (Get_Name_String (Sdep.Table (D).Sfile));
Write_Str (": up to date, different timestamps " &
"but same checksum");
Write_Eol;
end if;
Sdep.Table (D).Stamp := Source.Table (Src).Stamp;
end if;
end if;
if (not Read_Only) or else Source.Table (Src).Source_Found then
if not Source.Table (Src).Source_Found
or else Sdep.Table (D).Stamp /= Source.Table (Src).Stamp
then
-- If -dt debug flag set, output time stamp found/expected
if Source.Table (Src).Source_Found and then Debug_Flag_T then
Write_Str ("Source: """);
Get_Name_String (Sdep.Table (D).Sfile);
Write_Str (Name_Buffer (1 .. Name_Len));
Write_Line ("""");
Write_Str (" time stamp expected: ");
Write_Line (String (Sdep.Table (D).Stamp));
Write_Str (" time stamp found: ");
Write_Line (String (Source.Table (Src).Stamp));
end if;
-- Return the source file
return Source.Table (Src).Sfile;
end if;
end if;
end loop;
return No_File;
end Time_Stamp_Mismatch;
end ALI.Util;
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