re PR sanitizer/81923 ([ASAN] gcc emites wrong odr asan instrumentation for glibc)

	PR sanitizer/81923
	* asan.c (create_odr_indicator): Strip name encoding from assembler
	name before appending it after __odr_asan_.

	* gcc.dg/asan/pr81923.c: New test.

From-SVN: r251595

gcc/ChangeLog

+2017-09-01  Jakub Jelinek  <jakub@redhat.com>
+
+	PR sanitizer/81923
+	* asan.c (create_odr_indicator): Strip name encoding from assembler
+	name before appending it after __odr_asan_.
+
 2017-09-01  Martin Liska  <mliska@suse.cz>
 
 	PR tree-optimization/82059

gcc/asan.c

@@ -2527,9 +2527,12 @@ create_odr_indicator (tree decl, tree type)
   /* DECL_NAME theoretically might be NULL.  Bail out with 0 in this case.  */
   if (decl_name == NULL_TREE)
     return build_int_cst (uptr, 0);
-  size_t len = strlen (IDENTIFIER_POINTER (decl_name)) + sizeof ("__odr_asan_");
+  const char *dname = IDENTIFIER_POINTER (decl_name);
+  if (HAS_DECL_ASSEMBLER_NAME_P (decl))
+    dname = targetm.strip_name_encoding (dname);
+  size_t len = strlen (dname) + sizeof ("__odr_asan_");
   name = XALLOCAVEC (char, len);
-  snprintf (name, len, "__odr_asan_%s", IDENTIFIER_POINTER (decl_name));
+  snprintf (name, len, "__odr_asan_%s", dname);
 #ifndef NO_DOT_IN_LABEL
   name[sizeof ("__odr_asan") - 1] = '.';
 #elif !defined(NO_DOLLAR_IN_LABEL)

gcc/testsuite/ChangeLog

+2017-09-01  Jakub Jelinek  <jakub@redhat.com>
+
+	PR sanitizer/81923
+	* gcc.dg/asan/pr81923.c: New test.
+
 2017-09-01  Martin Liska  <mliska@suse.cz>
 
 	PR tree-optimization/82059

gcc/testsuite/gcc.dg/asan/pr81923.c

+/* PR sanitizer/81923 */
+/* { dg-do link } */
+
+int foobar __asm (__USER_LABEL_PREFIX__ "barbaz") = 34;
+
+int
+main ()
+{
+  return 0;
+}