re PR tree-optimization/43066 (ICE: SIGFPE with empty struct and va_arg)

2010-02-18  Martin Jambor  <mjambor@suse.cz>

	PR tree-optimization/43066
	* tree-sra.c (build_ref_for_offset_1): Return false on encountering an
	array with zero-sized element type.

	* testsuite/gcc.c-torture/compile/pr43066.c: New test.

From-SVN: r156863

gcc/ChangeLog

+2010-02-18  Martin Jambor  <mjambor@suse.cz>
+
+	PR tree-optimization/43066
+	* tree-sra.c (build_ref_for_offset_1): Return false on encountering an
+	array with zero-sized element type.
+
 2010-02-18  Jakub Jelinek  <jakub@redhat.com>
 
 	* dwarf2out.c (add_var_loc_to_decl): Change last argument to

gcc/testsuite/ChangeLog

+2010-02-18  Martin Jambor  <mjambor@suse.cz>
+
+	PR tree-optimization/43066
+	* gcc.c-torture/compile/pr43066.c: New test.
+
 2010-02-18  Uros Bizjak  <ubizjak@gmail.com>
 
 	* g++.dg/ext/attrib35.C: Fix target selector string.

gcc/testsuite/gcc.c-torture/compile/pr43066.c

+struct S {
+  struct { } empty[1];
+  int i;
+};
+
+int foo(int i, ...)
+{
+  struct S s;
+  __builtin_va_list va;
+  __builtin_va_start(va, i);
+  s = __builtin_va_arg(va, struct S);
+  __builtin_va_end(va);
+  return s.i;
+}

gcc/tree-sra.c

@@ -1432,7 +1432,7 @@ build_ref_for_offset_1 (tree *res, tree type, HOST_WIDE_INT offset,
 	  el_size = tree_low_cst (tr_size, 1);
 
 	  minidx = TYPE_MIN_VALUE (TYPE_DOMAIN (type));
-	  if (TREE_CODE (minidx) != INTEGER_CST)
+	  if (TREE_CODE (minidx) != INTEGER_CST || el_size == 0)
 	    return false;
 	  if (res)
 	    {