+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- A L I . U T I L --
--- --
--- B o d y --
--- --
--- $Revision: 1.3.10.1 $
--- --
--- Copyright (C) 1992-2001 Free Software Foundation, Inc. --
--- --
--- GNAT is free software; you can redistribute it and/or modify it under --
--- terms of the GNU General Public License as published by the Free Soft- --
--- ware Foundation; either version 2, or (at your option) any later ver- --
--- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
--- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
--- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
--- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNAT; see file COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
--- --
--- GNAT was originally developed by the GNAT team at New York University. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
-with Binderr; use Binderr;
-with Namet; use Namet;
-with Opt; use Opt;
-with Osint; use Osint;
-
-with System.CRC32;
-
-package body ALI.Util is
-
- -----------------------
- -- Local Subprograms --
- -----------------------
-
- procedure Accumulate_Checksum (C : Character; Csum : in out Word);
- pragma Inline (Accumulate_Checksum);
- -- This routine accumulates the checksum given character C. During the
- -- scanning of a source file, this routine is called with every character
- -- in the source, excluding blanks, and all control characters (except
- -- that ESC is included in the checksum). Upper case letters not in string
- -- literals are folded by the caller. See Sinput spec for the documentation
- -- of the checksum algorithm. Note: checksum values are only used if we
- -- generate code, so it is not necessary to worry about making the right
- -- sequence of calls in any error situation.
-
- procedure Initialize_Checksum (Csum : out Word);
- -- Sets initial value of Csum before any calls to Accumulate_Checksum
-
- -------------------------
- -- Accumulate_Checksum --
- -------------------------
-
- procedure Accumulate_Checksum (C : Character; Csum : in out Word) is
- begin
- System.CRC32.Update (System.CRC32.CRC32 (Csum), C);
- end Accumulate_Checksum;
-
- ---------------------
- -- Checksums_Match --
- ---------------------
-
- function Checksums_Match (Checksum1, Checksum2 : Word) return Boolean is
- begin
- return Checksum1 = Checksum2 and then Checksum1 /= Checksum_Error;
- end Checksums_Match;
-
- -----------------------
- -- Get_File_Checksum --
- -----------------------
-
- function Get_File_Checksum (Fname : Name_Id) return Word is
- Src : Source_Buffer_Ptr;
- Hi : Source_Ptr;
- Csum : Word;
- Ptr : Source_Ptr;
-
- Bad : exception;
- -- Raised if file not found, or file format error
-
- use ASCII;
- -- Make control characters visible
-
- procedure Free_Source;
- -- Free source file buffer
-
- procedure Free_Source is
- procedure free (Arg : Source_Buffer_Ptr);
- pragma Import (C, free, "free");
-
- begin
- free (Src);
- end Free_Source;
-
- -- Start of processing for Get_File_Checksum
-
- begin
- Read_Source_File (Fname, 0, Hi, Src);
-
- -- If we cannot find the file, then return an impossible checksum,
- -- impossible becaues checksums have the high order bit zero, so
- -- that checksums do not match.
-
- if Src = null then
- raise Bad;
- end if;
-
- Initialize_Checksum (Csum);
- Ptr := 0;
-
- loop
- case Src (Ptr) is
-
- -- Spaces and formatting information are ignored in checksum
-
- when ' ' | CR | LF | VT | FF | HT =>
- Ptr := Ptr + 1;
-
- -- EOF is ignored unless it is the last character
-
- when EOF =>
- if Ptr = Hi then
- Free_Source;
- return Csum;
- else
- Ptr := Ptr + 1;
- end if;
-
- -- Non-blank characters that are included in the checksum
-
- when '#' | '&' | '*' | ':' | '(' | ',' | '.' | '=' | '>' |
- '<' | ')' | '/' | ';' | '|' | '!' | '+' | '_' |
- '0' .. '9' | 'a' .. 'z'
- =>
- Accumulate_Checksum (Src (Ptr), Csum);
- Ptr := Ptr + 1;
-
- -- Upper case letters, fold to lower case
-
- when 'A' .. 'Z' =>
- Accumulate_Checksum
- (Character'Val (Character'Pos (Src (Ptr)) + 32), Csum);
- Ptr := Ptr + 1;
-
- -- Left bracket, really should do wide character thing here,
- -- but for now, don't bother.
-
- when '[' =>
- raise Bad;
-
- -- Minus, could be comment
-
- when '-' =>
- if Src (Ptr + 1) = '-' then
- Ptr := Ptr + 2;
-
- while Src (Ptr) >= ' ' or else Src (Ptr) = HT loop
- Ptr := Ptr + 1;
- end loop;
-
- else
- Accumulate_Checksum ('-', Csum);
- Ptr := Ptr + 1;
- end if;
-
- -- String delimited by double quote
-
- when '"' =>
- Accumulate_Checksum ('"', Csum);
-
- loop
- Ptr := Ptr + 1;
- exit when Src (Ptr) = '"';
-
- if Src (Ptr) < ' ' then
- raise Bad;
- end if;
-
- Accumulate_Checksum (Src (Ptr), Csum);
- end loop;
-
- Accumulate_Checksum ('"', Csum);
- Ptr := Ptr + 1;
-
- -- String delimited by percent
-
- when '%' =>
- Accumulate_Checksum ('%', Csum);
-
- loop
- Ptr := Ptr + 1;
- exit when Src (Ptr) = '%';
-
- if Src (Ptr) < ' ' then
- raise Bad;
- end if;
-
- Accumulate_Checksum (Src (Ptr), Csum);
- end loop;
-
- Accumulate_Checksum ('%', Csum);
- Ptr := Ptr + 1;
-
- -- Quote, could be character constant
-
- when ''' =>
- Accumulate_Checksum (''', Csum);
-
- if Src (Ptr + 2) = ''' then
- Accumulate_Checksum (Src (Ptr + 1), Csum);
- Accumulate_Checksum (''', Csum);
- Ptr := Ptr + 3;
-
- -- Otherwise assume attribute char. We should deal with wide
- -- character cases here, but that's hard, so forget it.
-
- else
- Ptr := Ptr + 1;
- end if;
-
- -- Upper half character, more to be done here, we should worry
- -- about folding Latin-1, folding other character sets, and
- -- dealing with the nasty case of upper half wide encoding.
-
- when Upper_Half_Character =>
- Accumulate_Checksum (Src (Ptr), Csum);
- Ptr := Ptr + 1;
-
- -- Escape character, we should do the wide character thing here,
- -- but for now, do not bother.
-
- when ESC =>
- raise Bad;
-
- -- Invalid control characters
-
- when NUL | SOH | STX | ETX | EOT | ENQ | ACK | BEL | BS | SO |
- SI | DLE | DC1 | DC2 | DC3 | DC4 | NAK | SYN | ETB | CAN |
- EM | FS | GS | RS | US | DEL
- =>
- raise Bad;
-
- -- Invalid graphic characters
-
- when '$' | '?' | '@' | '`' | '\' |
- '^' | '~' | ']' | '{' | '}'
- =>
- raise Bad;
-
- end case;
- end loop;
-
- exception
- when Bad =>
- Free_Source;
- return Checksum_Error;
-
- end Get_File_Checksum;
-
- ---------------------------
- -- 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;
- end Initialize_ALI_Source;
-
- -------------------------
- -- Initialize_Checksum --
- -------------------------
-
- procedure Initialize_Checksum (Csum : out Word) is
- begin
- System.CRC32.Initialize (System.CRC32.CRC32 (Csum));
- end Initialize_Checksum;
-
- --------------
- -- Read_ALI --
- --------------
-
- procedure Read_ALI (Id : ALI_Id) is
- Afile : File_Name_Type;
- Text : Text_Buffer_Ptr;
- Idread : ALI_Id;
-
- begin
- for I in ALIs.Table (Id).First_Unit .. ALIs.Table (Id).Last_Unit loop
- for J in Units.Table (I).First_With .. Units.Table (I).Last_With loop
-
- Afile := Withs.Table (J).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);
-
- if Text = null then
- Error_Msg_Name_1 := Afile;
- Error_Msg_Name_2 := Withs.Table (J).Sfile;
- Error_Msg ("% not found, % must be compiled");
- Set_Name_Table_Info (Afile, Int (No_Unit_Id));
- return;
- end if;
-
- Idread :=
- Scan_ALI
- (F => Afile,
- T => Text,
- Ignore_ED => Force_RM_Elaboration_Order,
- Err => False);
-
- Free (Text);
-
- if ALIs.Table (Idread).Compile_Errors then
- Error_Msg_Name_1 := Withs.Table (J).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 then
- Error_Msg_Name_1 := Withs.Table (J).Sfile;
- Error_Msg ("% must be recompiled");
- Set_Name_Table_Info (Afile, Int (No_Unit_Id));
- end if;
-
- -- Recurse to get new dependents
-
- Read_ALI (Idread);
- end if;
- end loop;
- end loop;
-
- end Read_ALI;
-
- ----------------------
- -- 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 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_Name_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 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) 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
- Sdep.Table (D).Stamp := Source.Table (Src).Stamp;
- end if;
-
- end if;
-
- if not Source.Table (Src).Source_Found
- or else Sdep.Table (D).Stamp /= Source.Table (Src).Stamp
- then
- return Source.Table (Src).Sfile;
- end if;
- end loop;
-
- return No_File;
-
- end Time_Stamp_Mismatch;
-
-end ALI.Util;
projects / msp430-gcc.git / blobdiff