+2009-07-06 Diego Novillo <dnovillo@google.com>
+
+ * tree-pretty-print.c (dump_generic_node): Protect
+ against NULL op0.
+ (debug_tree_chain): Handle cycles.
+
2009-07-06 Nick Clifton <nickc@redhat.com>
DJ Delorie <dj@redhat.com>
void
debug_tree_chain (tree t)
{
+ struct pointer_set_t *seen = pointer_set_create ();
+
while (t)
- {
- print_generic_expr (stderr, t, TDF_VOPS|TDF_MEMSYMS|TDF_UID);
- fprintf(stderr, " ");
- t = TREE_CHAIN (t);
- }
+ {
+ print_generic_expr (stderr, t, TDF_VOPS|TDF_MEMSYMS|TDF_UID);
+ fprintf (stderr, " ");
+ t = TREE_CHAIN (t);
+ if (pointer_set_insert (seen, t))
+ {
+ fprintf (stderr, "... [cycled back to ");
+ print_generic_expr (stderr, t, TDF_VOPS|TDF_MEMSYMS|TDF_UID);
+ fprintf (stderr, "]");
+ break;
+ }
+ }
fprintf (stderr, "\n");
+
+ pointer_set_destroy (seen);
}
/* Prints declaration DECL to the FILE with details specified by FLAGS. */
case COMPONENT_REF:
op0 = TREE_OPERAND (node, 0);
str = ".";
- if (TREE_CODE (op0) == INDIRECT_REF)
+ if (op0 && TREE_CODE (op0) == INDIRECT_REF)
{
op0 = TREE_OPERAND (op0, 0);
str = "->";