* Makefile.in:

	(GNAT_ADA_OBJS): add g-crc32.o, a-tags.o, a-stream.o
	(GNATBIND_OBJS): add g-crc32.o, a-tags.o, a-stream.o
	(GNATLS_RTL_OBJS): add g-crc32.o
	(GNATMAKE_RTL_OBJS): add g-crc32.o

	* ali-util.adb:
	(CRC_Match): new function.
	(Get_File_Checksum): renamed Get_File_CRC. Use the GNAT.CRC32 unit
	instead of the previous simple checksum algorithm.
	(Time_Stamp_Mismatch): use CRC_Match for comparison.
	(Set_Source_Table): idem.

	* ali-util.ads:
	(Get_File_Checksum): renamed Get_File_CRC as now we compute CRC
	instead of simple checksum.
	(CRC_Match): new function.
	(CRC_Error): new constant.

	* ali.adb (Scan_ALI): rename variable Chk to CRC as we are handling
	a CRC now and not a simple checksum. A CRC uses lower-case hex
	letters, fixes ambiguity in parsing.

	* ali.ads (Sdep_Record.Checksum): renamed Sdep_Record.CRC as this
	is what this variable will store.

	* bcheck.adb: Change reference to chechsum in comments by CRC.
	(Check_Consistency): Rename Get_File_Checksum to Get_File_CRC.
	rename All_Checksum_Match to All_CRC_Match. Change due to API
	renaming since now GNAT does not use a simple checksum but a
	CRC using GNAT.CRC32.

	* gnatls.adb: Rename Checksum to CRC in many places, we use a CRC
	now and not anymore a simple checksum.

	* lib-load.adb: Use Source_CRC instead of Source_Checksum in many
	places.

	* lib-writ.adb (Write_ALI): Use Source_CRC instead of Source_Checksum.

	* scans.adb:
	(Restore_Scan_State): rename Checksum to CRC.
	(Save_Scan_State): idem.

	* scans.ads:
	With GNAT.CRC32.
	(Checksum): rename to CRC.
	(Saved_Scan_State): Save_Checksum field renamed to Save_CRC

	* scn-nlit.adb: Rename many Accumulate_Checksum to Update (from
	GNAT.CRC32).  Update copyright notice.

	* scn-slit.adb: Rename many Accumulate_Checksum to Update (from
	GNAT.CRC32).  Update copyright notice.

	* scn.adb:
	(Accumulate_Checksum): removed.
	(Update): new procedure. Add a wide-character into the CRC.

	* sinput-l.adb:
	(Complete_Source_File_Entry): use CRC32 instead of simple checksum.
	(Load_File): fix initialization of S (change Source_Checksum to
	Source_CRC)

	* sinput-p.adb (Load_Project_File): rename Source_Checksum to
	Source_CRC in S initialization.

	* sinput.adb (Source_Checksum): renamed to Source_CRC.

	* sinput.ads (Source_Checksum): renamed to Source_CRC.
	Update comments for the CRC.

	* types.adb (Hex): Use lowercase for the letter part.

	* types.ads (Get_Hex_String): Returns the hexadecimal representation
	for a word. This is currently used only for CRC. In previous version,
	the checksum was using a representation with all letter being
	upper-case. With the new implementation (using CRC) we do not remove
	the 32th bit of the CRC, so we can have an upper-case starting letter
	in the CRC. This is not possible to parse in Scan_ALI (ali.adb).
	It is ambigous since the CRC was optional and could be followed by
	options like EB, EE. So now this routines uses lower-case letter for
	the hexadecimal representation. Strange enough only lower case letters
	where checked in Scan_ALI (even if this was not a possible case).

	* gnatvsn.ads (Library_Version): changed to 3.15a.

	* s-crc32.ads: Initial version from GNAT.CRC32. This is the version
	for the compiler.

	* s-crc32.adb: Initial version from GNAT.CRC32. This is the version
	for the compiler.

	* ali-util.adb: Redo previous change to avoid using word CRC everywhere
	Add 2001 to copyright notice
	(Accumulate_Checksum): Modify to use System.CRC32.

	* ali-util.ads: Redo changes of previous revision to continue to use
	the word Checksum. Add 2001 to copyright notice.

	* ali.adb: Undo some of previous changes, not needed.
	Keep the change for lower case letters in the checksum.

	* ali.ads: Undo previous change not needed.

	* bcheck.adb: Undo most of previous change, not needed.
	But do use Checksums_Match for checksum comparison.

	* gnatls.adb: Undo most of previous change, not needed.
	But do use Checksums_Match for comparing checksums.

	* lib-load.adb: Undo previous change, not needed.

	* lib-writ.adb: Undo previous change, not needed.

	* lib-writ.ads: Document that checksums use lower case,
	not upper case letters.

	* scans.adb: Undo previous change, not needed

	* scans.ads: Undo previous change, not needed.

	* scn-nlit.adb: Undo previous changes, not needed.

	* scn-slit.adb: Undo previous change, not needed.  Fix header format.

	* scn.adb:
	(Accumulate_Checksum): Use System.CRC32.
	(Initialize_Checksum): New procedure.
	Remove other changes of previous revision.

	* sinput-p.adb: Undo previous change, not needed.

	* sinput.adb: Undo previous change, not needed.

	* sinput-l.adb: Undo previous change, not needed.

	* sinput.ads: Undo previous change, not needed.  Keep only comment
	on new checksum algorithm

	* Makefile.in: Add s-crc32 as needed, remove g-crc32.
	Also remove a-tags and a-stream from GNAT sources.

	* ali.adb (Scan_ALI): fix typo introduce in latest check-in.

	* Makefile.in (GNATRTL_NONTASKING_OBJS): Add g-crc32.o.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@46206 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 139 insertions, 0 deletions

diff --git a/gcc/ada/s-crc32.adb b/gcc/ada/s-crc32.adb
new file mode 100644
index 00000000000..120914b3c00
--- /dev/null
+++ b/gcc/ada/s-crc32.adb
@@ -0,0 +1,139 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT LIBRARY COMPONENTS                          --
+--                                                                          --
+--                        S Y S T E M  . C R C 3 2                          --
+--                                                                          --
+--                                 B o d y                                  --
+--                                                                          --
+--                            $Revision$
+--                                                                          --
+--              Copyright (C) 2001 Ada Core Technologies, 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.                                                      --
+--                                                                          --
+-- As a special exception,  if other files  instantiate  generics from this --
+-- unit, or you link  this unit with other files  to produce an executable, --
+-- this  unit  does not  by itself cause  the resulting  executable  to  be --
+-- covered  by the  GNU  General  Public  License.  This exception does not --
+-- however invalidate  any other reasons why  the executable file  might be --
+-- covered by the  GNU Public License.                                      --
+--                                                                          --
+-- GNAT is maintained by Ada Core Technologies Inc (http://www.gnat.com).   --
+--                                                                          --
+------------------------------------------------------------------------------
+
+package body System.CRC32 is
+
+   Init   : constant CRC32 := 16#FFFF_FFFF#;  -- Initial value
+   XorOut : constant CRC32 := 16#FFFF_FFFF#;  -- To compute final result.
+
+   --  The following table contains precomputed values for contributions
+   --  from various possible byte values. Doing a table lookup is quicker
+   --  than processing the byte bit by bit.
+
+   Table : array (CRC32 range 0 .. 255) of CRC32 :=
+     (16#0000_0000#, 16#7707_3096#, 16#EE0E_612C#, 16#9909_51BA#,
+      16#076D_C419#, 16#706A_F48F#, 16#E963_A535#, 16#9E64_95A3#,
+      16#0EDB_8832#, 16#79DC_B8A4#, 16#E0D5_E91E#, 16#97D2_D988#,
+      16#09B6_4C2B#, 16#7EB1_7CBD#, 16#E7B8_2D07#, 16#90BF_1D91#,
+      16#1DB7_1064#, 16#6AB0_20F2#, 16#F3B9_7148#, 16#84BE_41DE#,
+      16#1ADA_D47D#, 16#6DDD_E4EB#, 16#F4D4_B551#, 16#83D3_85C7#,
+      16#136C_9856#, 16#646B_A8C0#, 16#FD62_F97A#, 16#8A65_C9EC#,
+      16#1401_5C4F#, 16#6306_6CD9#, 16#FA0F_3D63#, 16#8D08_0DF5#,
+      16#3B6E_20C8#, 16#4C69_105E#, 16#D560_41E4#, 16#A267_7172#,
+      16#3C03_E4D1#, 16#4B04_D447#, 16#D20D_85FD#, 16#A50A_B56B#,
+      16#35B5_A8FA#, 16#42B2_986C#, 16#DBBB_C9D6#, 16#ACBC_F940#,
+      16#32D8_6CE3#, 16#45DF_5C75#, 16#DCD6_0DCF#, 16#ABD1_3D59#,
+      16#26D9_30AC#, 16#51DE_003A#, 16#C8D7_5180#, 16#BFD0_6116#,
+      16#21B4_F4B5#, 16#56B3_C423#, 16#CFBA_9599#, 16#B8BD_A50F#,
+      16#2802_B89E#, 16#5F05_8808#, 16#C60C_D9B2#, 16#B10B_E924#,
+      16#2F6F_7C87#, 16#5868_4C11#, 16#C161_1DAB#, 16#B666_2D3D#,
+      16#76DC_4190#, 16#01DB_7106#, 16#98D2_20BC#, 16#EFD5_102A#,
+      16#71B1_8589#, 16#06B6_B51F#, 16#9FBF_E4A5#, 16#E8B8_D433#,
+      16#7807_C9A2#, 16#0F00_F934#, 16#9609_A88E#, 16#E10E_9818#,
+      16#7F6A_0DBB#, 16#086D_3D2D#, 16#9164_6C97#, 16#E663_5C01#,
+      16#6B6B_51F4#, 16#1C6C_6162#, 16#8565_30D8#, 16#F262_004E#,
+      16#6C06_95ED#, 16#1B01_A57B#, 16#8208_F4C1#, 16#F50F_C457#,
+      16#65B0_D9C6#, 16#12B7_E950#, 16#8BBE_B8EA#, 16#FCB9_887C#,
+      16#62DD_1DDF#, 16#15DA_2D49#, 16#8CD3_7CF3#, 16#FBD4_4C65#,
+      16#4DB2_6158#, 16#3AB5_51CE#, 16#A3BC_0074#, 16#D4BB_30E2#,
+      16#4ADF_A541#, 16#3DD8_95D7#, 16#A4D1_C46D#, 16#D3D6_F4FB#,
+      16#4369_E96A#, 16#346E_D9FC#, 16#AD67_8846#, 16#DA60_B8D0#,
+      16#4404_2D73#, 16#3303_1DE5#, 16#AA0A_4C5F#, 16#DD0D_7CC9#,
+      16#5005_713C#, 16#2702_41AA#, 16#BE0B_1010#, 16#C90C_2086#,
+      16#5768_B525#, 16#206F_85B3#, 16#B966_D409#, 16#CE61_E49F#,
+      16#5EDE_F90E#, 16#29D9_C998#, 16#B0D0_9822#, 16#C7D7_A8B4#,
+      16#59B3_3D17#, 16#2EB4_0D81#, 16#B7BD_5C3B#, 16#C0BA_6CAD#,
+      16#EDB8_8320#, 16#9ABF_B3B6#, 16#03B6_E20C#, 16#74B1_D29A#,
+      16#EAD5_4739#, 16#9DD2_77AF#, 16#04DB_2615#, 16#73DC_1683#,
+      16#E363_0B12#, 16#9464_3B84#, 16#0D6D_6A3E#, 16#7A6A_5AA8#,
+      16#E40E_CF0B#, 16#9309_FF9D#, 16#0A00_AE27#, 16#7D07_9EB1#,
+      16#F00F_9344#, 16#8708_A3D2#, 16#1E01_F268#, 16#6906_C2FE#,
+      16#F762_575D#, 16#8065_67CB#, 16#196C_3671#, 16#6E6B_06E7#,
+      16#FED4_1B76#, 16#89D3_2BE0#, 16#10DA_7A5A#, 16#67DD_4ACC#,
+      16#F9B9_DF6F#, 16#8EBE_EFF9#, 16#17B7_BE43#, 16#60B0_8ED5#,
+      16#D6D6_A3E8#, 16#A1D1_937E#, 16#38D8_C2C4#, 16#4FDF_F252#,
+      16#D1BB_67F1#, 16#A6BC_5767#, 16#3FB5_06DD#, 16#48B2_364B#,
+      16#D80D_2BDA#, 16#AF0A_1B4C#, 16#3603_4AF6#, 16#4104_7A60#,
+      16#DF60_EFC3#, 16#A867_DF55#, 16#316E_8EEF#, 16#4669_BE79#,
+      16#CB61_B38C#, 16#BC66_831A#, 16#256F_D2A0#, 16#5268_E236#,
+      16#CC0C_7795#, 16#BB0B_4703#, 16#2202_16B9#, 16#5505_262F#,
+      16#C5BA_3BBE#, 16#B2BD_0B28#, 16#2BB4_5A92#, 16#5CB3_6A04#,
+      16#C2D7_FFA7#, 16#B5D0_CF31#, 16#2CD9_9E8B#, 16#5BDE_AE1D#,
+      16#9B64_C2B0#, 16#EC63_F226#, 16#756A_A39C#, 16#026D_930A#,
+      16#9C09_06A9#, 16#EB0E_363F#, 16#7207_6785#, 16#0500_5713#,
+      16#95BF_4A82#, 16#E2B8_7A14#, 16#7BB1_2BAE#, 16#0CB6_1B38#,
+      16#92D2_8E9B#, 16#E5D5_BE0D#, 16#7CDC_EFB7#, 16#0BDB_DF21#,
+      16#86D3_D2D4#, 16#F1D4_E242#, 16#68DD_B3F8#, 16#1FDA_836E#,
+      16#81BE_16CD#, 16#F6B9_265B#, 16#6FB0_77E1#, 16#18B7_4777#,
+      16#8808_5AE6#, 16#FF0F_6A70#, 16#6606_3BCA#, 16#1101_0B5C#,
+      16#8F65_9EFF#, 16#F862_AE69#, 16#616B_FFD3#, 16#166C_CF45#,
+      16#A00A_E278#, 16#D70D_D2EE#, 16#4E04_8354#, 16#3903_B3C2#,
+      16#A767_2661#, 16#D060_16F7#, 16#4969_474D#, 16#3E6E_77DB#,
+      16#AED1_6A4A#, 16#D9D6_5ADC#, 16#40DF_0B66#, 16#37D8_3BF0#,
+      16#A9BC_AE53#, 16#DEBB_9EC5#, 16#47B2_CF7F#, 16#30B5_FFE9#,
+      16#BDBD_F21C#, 16#CABA_C28A#, 16#53B3_9330#, 16#24B4_A3A6#,
+      16#BAD0_3605#, 16#CDD7_0693#, 16#54DE_5729#, 16#23D9_67BF#,
+      16#B366_7A2E#, 16#C461_4AB8#, 16#5D68_1B02#, 16#2A6F_2B94#,
+      16#B40B_BE37#, 16#C30C_8EA1#, 16#5A05_DF1B#, 16#2D02_EF8D#);
+
+   ---------------
+   -- Get_Value --
+   ---------------
+
+   function Get_Value (C : CRC32) return Interfaces.Unsigned_32 is
+   begin
+      return Interfaces.Unsigned_32 (C xor XorOut);
+   end Get_Value;
+
+   ----------------
+   -- Initialize --
+   ----------------
+
+   procedure Initialize (C : out CRC32) is
+   begin
+      C := Init;
+   end Initialize;
+
+   ------------
+   -- Update --
+   ------------
+
+   procedure Update (C : in out CRC32; Value : Character) is
+      V : constant CRC32 := CRC32 (Character'Pos (Value));
+
+   begin
+      C := Shift_Right (C, 8) xor Table (V xor (C and 16#0000_00FF#));
+   end Update;
+
+end System.CRC32;