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tree-pretty-print.c (dump_generic_node): Protect against NULL op0. 

* tree-pretty-print.c (dump_generic_node): Protect
	against NULL op0.
	(debug_tree_chain): Handle cycles.

From-SVN: r149289
This commit is contained in:
Diego Novillo 2009-07-06 13:04:34 -04:00 committed by Diego Novillo
parent b824522ad4
commit e923c8ea8c
2 changed files with 23 additions and 6 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
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>

23
gcc/tree-pretty-print.c
View File

@ -99,13 +99,24 @@ debug_generic_stmt (tree t)
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. */
@ -1051,7 +1062,7 @@ dump_generic_node (pretty_printer *buffer, tree node, int spc, int 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 = "->";