re PR lto/64373 (ICE with lto related to variably modified type)

2015-01-13  Richard Biener  <rguenther@suse.de>

	PR lto/64373
	* lto-streamer-out.c (tree_is_indexable): Guard for NULL
	DECL_CONTEXT.

	* gcc.dg/lto/pr64373_0.c: New testcase.

From-SVN: r219531

gcc/ChangeLog

+2015-01-13  Richard Biener  <rguenther@suse.de>
+
+	PR lto/64373
+	* lto-streamer-out.c (tree_is_indexable): Guard for NULL
+	DECL_CONTEXT.
+
 2015-01-13  Andrew Pinski   <apinski@cavium.com>
 
 	* config/aarch64/aarch64.c (aarch64_operands_ok_for_ldpstp): Reject

gcc/lto-streamer-out.c

@@ -154,7 +154,8 @@ tree_is_indexable (tree t)
   /* Parameters and return values of functions of variably modified types
      must go to global stream, because they may be used in the type
      definition.  */
-  if (TREE_CODE (t) == PARM_DECL || TREE_CODE (t) == RESULT_DECL)
+  if ((TREE_CODE (t) == PARM_DECL || TREE_CODE (t) == RESULT_DECL)
+      && DECL_CONTEXT (t))
     return variably_modified_type_p (TREE_TYPE (DECL_CONTEXT (t)), NULL_TREE);
   /* IMPORTED_DECL is put into BLOCK and thus it never can be shared.  */
   else if (TREE_CODE (t) == IMPORTED_DECL)

gcc/testsuite/ChangeLog

+2015-01-13  Richard Biener  <rguenther@suse.de>
+
+	PR lto/64373
+	* gcc.dg/lto/pr64373_0.c: New testcase.
+
 2015-01-13  Andrew Pinski  <apinski@cavium.com>
 
 	* gcc.target/aarch64/volatileloadpair-1.c: New testcase.

gcc/testsuite/gcc.dg/lto/pr64373_0.c

+/* { dg-lto-do assemble } */
+
+extern void b(int L, float (*data)[L]);
+
+void a(void)
+{
+  float* p = 0;
+  int i = 0;
+  b(10, (float (*)[10])(p + i));
+}