From 20c361f30eabe19869e6d2f338785e81866c3176 Mon Sep 17 00:00:00 2001
From: Jan Hubicka <jh@suse.cz>
Date: Sun, 18 Jan 2004 16:10:23 +0100
Subject: [PATCH] coverage.c (checksum_string): Rename to ...

	* coverage.c (checksum_string): Rename to ...
	(coverage_checksum_string): ... this one, Use crc32_string; recognize
	names containing random number and zero the number out in order to get
	match.

From-SVN: r76102
---
 gcc/ChangeLog  |  7 ++++++
 gcc/coverage.c | 61 +++++++++++++++++++++++++++++++++++++-------------
 2 files changed, 52 insertions(+), 16 deletions(-)

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 47ec2e7fbb9..a7db3f7ba90 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2004-01-18  Jan Hubicka  <jh@suse.cz>
+
+	* coverage.c (checksum_string): Rename to ...
+	(coverage_checksum_string): ... this one, Use crc32_string; recognize
+	names containing random number and zero the number out in order to get
+	match.
+
 2004-01-18  Richard Sandiford  <rsandifo@redhat.com>
 
 	* config/mips/mips.c (mips_got_alias_set): Mark for PCH.
diff --git a/gcc/coverage.c b/gcc/coverage.c
index f14f0f666fe..d6322b2ca77 100644
--- a/gcc/coverage.c
+++ b/gcc/coverage.c
@@ -109,7 +109,7 @@ static int htab_counts_entry_eq (const void *, const void *);
 static void htab_counts_entry_del (void *);
 static void read_counts_file (void);
 static unsigned compute_checksum (void);
-static unsigned checksum_string (unsigned, const char *);
+static unsigned coverage_checksum_string (unsigned, const char *);
 static tree build_fn_info_type (unsigned);
 static tree build_fn_info_value (const struct function_list *, tree);
 static tree build_ctr_info_type (void);
@@ -405,23 +405,51 @@ coverage_counter_ref (unsigned counter, unsigned no)
    checksum.  */
 
 static unsigned
-checksum_string (unsigned chksum, const char *string)
+coverage_checksum_string (unsigned chksum, const char *string)
 {
-  do
+  int i;
+  char *dup = NULL;
+
+  /* Look for everything that looks if it were produced by
+     get_file_function_name_long and zero out the second part
+     that may result from flag_random_seed.  This is not critical
+     as the checksums are used only for sanity checking.  */
+  for (i = 0; string[i]; i++)
     {
-      unsigned value = *string << 24;
-      unsigned ix;
+      if (!strncmp (string + i, "_GLOBAL__", 9))
+	for (i = i + 9; string[i]; i++)
+	  if (string[i]=='_')
+	    {
+	      int y;
+	      unsigned seed;
 
-      for (ix = 8; ix--; value <<= 1)
-	{
-	  unsigned feedback;
-
-	  feedback = (value ^ chksum) & 0x80000000 ? 0x04c11db7 : 0;
-	  chksum <<= 1;
-	  chksum ^= feedback;
-	}
+	      for (y = 1; y < 9; y++)
+		if (!(string[i + y] >= '0' && string[i + y] <= '9')
+		    && !(string[i + y] >= 'A' && string[i + y] <= 'F'))
+		  break;
+	      if (y != 9 || string[i + 9] != '_')
+		continue;
+	      for (y = 10; y < 18; y++)
+		if (!(string[i + y] >= '0' && string[i + y] <= '9')
+		    && !(string[i + y] >= 'A' && string[i + y] <= 'F'))
+		  break;
+	      if (y != 18)
+		continue;
+	      if (!sscanf (string + i + 10, "%X", &seed))
+		abort ();
+	      if (seed != crc32_string (0, flag_random_seed))
+		continue;
+	      string = dup = xstrdup (string);
+	      for (y = 10; y < 18; y++)
+		dup[i + y] = '0';
+	      break;
+	    }
+      break;
     }
-  while (*string++);
+
+  chksum = crc32_string (chksum, string);
+  if (dup)
+    free (dup);
 
   return chksum;
 }
@@ -433,8 +461,9 @@ compute_checksum (void)
 {
   unsigned chksum = DECL_SOURCE_LINE (current_function_decl);
 
-  chksum = checksum_string (chksum, DECL_SOURCE_FILE (current_function_decl));
-  chksum = checksum_string
+  chksum = coverage_checksum_string (chksum,
+      				     DECL_SOURCE_FILE (current_function_decl));
+  chksum = coverage_checksum_string
     (chksum, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl)));
 
   return chksum;