Hello!
There is a problem with multiple calls of cgraph_node_name in fprintf
dumps. Please note that C++ uses caching in
cxx_printable_name_internal (aka LANG_HOOKS_DECL_PRINTABLE_NAME), so
when cxx_printable_name_internal is called multiple times from printf
(i.e. fprintf "%s/%i -> %s/%i"), it can happen that the first string
gets evicted by the second call, before fprintf is fully evaluated.
Attached patch audits all uses of cgraph_node_name, and in case of
multiple calls in dump fprintf, wraps every call in xstrdup. This
fixes valgrind report in the PR, as well as original dump failure on
alpha [1].
I think that small memory leak is tolerable here (the changes are
exclusively in the dump code), and follows the same approach as in
java frontend.
2012-04-30 Uros Bizjak <ubiz...@gmail.com>
PR middle-end/53136
* ipa-prop.c (ipa_print_node_jump_functions): Wrap multiple
calls to cgraph_node_name in xstrdup.
(ipa_make_edge_direct_to_target): Ditto.
* cgraph.c (dump_cgraph_node): Ditto.
* tree-sra.c (convert_callers_for_node): Ditto.
* lto-symtab.c (lto_cgraph_replace_node): Ditto.
* ipa-cp.c (perhaps_add_new_callers): Ditto.
* cgraphunit.c (cgraph_redirect_edge_call_stmt_to_callee): Ditto.
(cgraph_materialize_all_clones): Ditto.
* ipa-inline.c (report_inline_failed_reason): Ditto.
(want_early_inline_function_p): Ditto.
(edge_badness): Ditto.
(update_edge_key): Ditto.
(flatten_function): Ditto.
(ipa_inline): Ditto.
(inlinw_always_inline_functions): Ditto.
(early_inline_small_functions): Ditto.
Patch was tested on x86_64-pc-linux-gnu {,-m32} and alphaev68-pc-linux-gnu.
OK for mainline?
[1] http://gcc.gnu.org/ml/gcc-testresults/2012-04/msg02722.html
Uros.
Index: tree-sra.c
===================================================================
--- tree-sra.c (revision 186992)
+++ tree-sra.c (working copy)
@@ -4612,8 +4612,8 @@ convert_callers_for_node (struct cgraph_node *node
if (dump_file)
fprintf (dump_file, "Adjusting call (%i -> %i) %s -> %s\n",
cs->caller->uid, cs->callee->uid,
- cgraph_node_name (cs->caller),
- cgraph_node_name (cs->callee));
+ xstrdup (cgraph_node_name (cs->caller)),
+ xstrdup (cgraph_node_name (cs->callee)));
ipa_modify_call_arguments (cs, cs->call_stmt, adjustments);
Index: ipa-prop.c
===================================================================
--- ipa-prop.c (revision 186992)
+++ ipa-prop.c (working copy)
@@ -230,8 +230,8 @@ ipa_print_node_jump_functions (FILE *f, struct cgr
continue;
fprintf (f, " callsite %s/%i -> %s/%i : \n",
- cgraph_node_name (node), node->uid,
- cgraph_node_name (cs->callee), cs->callee->uid);
+ xstrdup (cgraph_node_name (node)), node->uid,
+ xstrdup (cgraph_node_name (cs->callee)), cs->callee->uid);
ipa_print_node_jump_functions_for_edge (f, cs);
}
@@ -1780,8 +1780,8 @@ ipa_make_edge_direct_to_target (struct cgraph_edge
fprintf (dump_file, "ipa-prop: Discovered %s call to a known target "
"(%s/%i -> %s/%i), for stmt ",
ie->indirect_info->polymorphic ? "a virtual" : "an indirect",
- cgraph_node_name (ie->caller), ie->caller->uid,
- cgraph_node_name (ie->callee), ie->callee->uid);
+ xstrdup (cgraph_node_name (ie->caller)), ie->caller->uid,
+ xstrdup (cgraph_node_name (ie->callee)), ie->callee->uid);
if (ie->call_stmt)
print_gimple_stmt (dump_file, ie->call_stmt, 2, TDF_SLIM);
else
Index: cgraph.c
===================================================================
--- cgraph.c (revision 186992)
+++ cgraph.c (working copy)
@@ -1521,9 +1521,9 @@ dump_cgraph_node (FILE *f, struct cgraph_node *nod
if (node->global.inlined_to)
fprintf (f, " Function %s/%i is inline copy in %s/%i\n",
- cgraph_node_name (node),
+ xstrdup (cgraph_node_name (node)),
node->symbol.order,
- cgraph_node_name (node->global.inlined_to),
+ xstrdup (cgraph_node_name (node->global.inlined_to)),
node->global.inlined_to->symbol.order);
if (node->clone_of)
fprintf (f, " Clone of %s/%i\n",
Index: lto-symtab.c
===================================================================
--- lto-symtab.c (revision 186992)
+++ lto-symtab.c (working copy)
@@ -215,8 +215,8 @@ lto_cgraph_replace_node (struct cgraph_node *node,
{
fprintf (cgraph_dump_file, "Replacing cgraph node %s/%i by %s/%i"
" for symbol %s\n",
- cgraph_node_name (node), node->uid,
- cgraph_node_name (prevailing_node),
+ xstrdup (cgraph_node_name (node)), node->uid,
+ xstrdup (cgraph_node_name (prevailing_node)),
prevailing_node->uid,
IDENTIFIER_POINTER ((*targetm.asm_out.mangle_assembler_name)
(IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME
(node->symbol.decl)))));
Index: ipa-cp.c
===================================================================
--- ipa-cp.c (revision 186992)
+++ ipa-cp.c (working copy)
@@ -2180,8 +2180,9 @@ perhaps_add_new_callers (struct cgraph_node *node,
if (dump_file)
fprintf (dump_file, " - adding an extra caller %s/%i"
" of %s/%i\n",
- cgraph_node_name (cs->caller), cs->caller->uid,
- cgraph_node_name (val->spec_node),
+ xstrdup (cgraph_node_name (cs->caller)),
+ cs->caller->uid,
+ xstrdup (cgraph_node_name (val->spec_node)),
val->spec_node->uid);
cgraph_redirect_edge_callee (cs, val->spec_node);
Index: cgraphunit.c
===================================================================
--- cgraphunit.c (revision 186992)
+++ cgraphunit.c (working copy)
@@ -2133,8 +2133,8 @@ cgraph_redirect_edge_call_stmt_to_callee (struct c
if (cgraph_dump_file)
{
fprintf (cgraph_dump_file, "updating call of %s/%i -> %s/%i: ",
- cgraph_node_name (e->caller), e->caller->uid,
- cgraph_node_name (e->callee), e->callee->uid);
+ xstrdup (cgraph_node_name (e->caller)), e->caller->uid,
+ xstrdup (cgraph_node_name (e->callee)), e->callee->uid);
print_gimple_stmt (cgraph_dump_file, e->call_stmt, 0, dump_flags);
if (e->callee->clone.combined_args_to_skip)
{
@@ -2220,8 +2220,8 @@ cgraph_materialize_all_clones (void)
if (cgraph_dump_file)
{
fprintf (cgraph_dump_file, "cloning %s to %s\n",
- cgraph_node_name (node->clone_of),
- cgraph_node_name (node));
+ xstrdup (cgraph_node_name (node->clone_of)),
+ xstrdup (cgraph_node_name (node)));
if (node->clone.tree_map)
{
unsigned int i;
Index: ipa-inline.c
===================================================================
--- ipa-inline.c (revision 186992)
+++ ipa-inline.c (working copy)
@@ -220,8 +220,8 @@ report_inline_failed_reason (struct cgraph_edge *e
if (dump_file)
{
fprintf (dump_file, " not inlinable: %s/%i -> %s/%i, %s\n",
- cgraph_node_name (e->caller), e->caller->uid,
- cgraph_node_name (e->callee), e->callee->uid,
+ xstrdup (cgraph_node_name (e->caller)), e->caller->uid,
+ xstrdup (cgraph_node_name (e->callee)), e->callee->uid,
cgraph_inline_failed_string (e->inline_failed));
}
}
@@ -423,8 +423,8 @@ want_early_inline_function_p (struct cgraph_edge *
if (dump_file)
fprintf (dump_file, " will not early inline: %s/%i->%s/%i, "
"call is cold and code would grow by %i\n",
- cgraph_node_name (e->caller), e->caller->uid,
- cgraph_node_name (callee), callee->uid,
+ xstrdup (cgraph_node_name (e->caller)), e->caller->uid,
+ xstrdup (cgraph_node_name (callee)), callee->uid,
growth);
want_inline = false;
}
@@ -434,8 +434,8 @@ want_early_inline_function_p (struct cgraph_edge *
if (dump_file)
fprintf (dump_file, " will not early inline: %s/%i->%s/%i, "
"callee is not leaf and code would grow by %i\n",
- cgraph_node_name (e->caller), e->caller->uid,
- cgraph_node_name (callee), callee->uid,
+ xstrdup (cgraph_node_name (e->caller)), e->caller->uid,
+ xstrdup (cgraph_node_name (callee)), callee->uid,
growth);
want_inline = false;
}
@@ -444,8 +444,8 @@ want_early_inline_function_p (struct cgraph_edge *
if (dump_file)
fprintf (dump_file, " will not early inline: %s/%i->%s/%i, "
"growth %i exceeds --param early-inlining-insns\n",
- cgraph_node_name (e->caller), e->caller->uid,
- cgraph_node_name (callee), callee->uid,
+ xstrdup (cgraph_node_name (e->caller)), e->caller->uid,
+ xstrdup (cgraph_node_name (callee)), callee->uid,
growth);
want_inline = false;
}
@@ -754,8 +754,8 @@ edge_badness (struct cgraph_edge *edge, bool dump)
if (dump)
{
fprintf (dump_file, " Badness calculation for %s -> %s\n",
- cgraph_node_name (edge->caller),
- cgraph_node_name (callee));
+ xstrdup (cgraph_node_name (edge->caller)),
+ xstrdup (cgraph_node_name (callee)));
fprintf (dump_file, " size growth %i, time growth %i\n",
growth,
time_growth);
@@ -910,8 +910,10 @@ update_edge_key (fibheap_t heap, struct cgraph_edg
{
fprintf (dump_file,
" decreasing badness %s/%i -> %s/%i, %i to %i\n",
- cgraph_node_name (edge->caller), edge->caller->uid,
- cgraph_node_name (edge->callee), edge->callee->uid,
+ xstrdup (cgraph_node_name (edge->caller)),
+ edge->caller->uid,
+ xstrdup (cgraph_node_name (edge->callee)),
+ edge->callee->uid,
(int)n->key,
badness);
}
@@ -925,8 +927,10 @@ update_edge_key (fibheap_t heap, struct cgraph_edg
{
fprintf (dump_file,
" enqueuing call %s/%i -> %s/%i, badness %i\n",
- cgraph_node_name (edge->caller), edge->caller->uid,
- cgraph_node_name (edge->callee), edge->callee->uid,
+ xstrdup (cgraph_node_name (edge->caller)),
+ edge->caller->uid,
+ xstrdup (cgraph_node_name (edge->callee)),
+ edge->callee->uid,
badness);
}
edge->aux = fibheap_insert (heap, badness, edge);
@@ -1610,8 +1614,8 @@ flatten_function (struct cgraph_node *node, bool e
if (dump_file)
fprintf (dump_file,
"Not inlining %s into %s to avoid cycle.\n",
- cgraph_node_name (callee),
- cgraph_node_name (e->caller));
+ xstrdup (cgraph_node_name (callee)),
+ xstrdup (cgraph_node_name (e->caller)));
e->inline_failed = CIF_RECURSIVE_INLINING;
continue;
}
@@ -1651,8 +1655,8 @@ flatten_function (struct cgraph_node *node, bool e
recursing through the original node if the node was cloned. */
if (dump_file)
fprintf (dump_file, " Inlining %s into %s.\n",
- cgraph_node_name (callee),
- cgraph_node_name (e->caller));
+ xstrdup (cgraph_node_name (callee)),
+ xstrdup (cgraph_node_name (e->caller)));
orig_callee = callee;
inline_call (e, true, NULL, NULL);
if (e->callee != orig_callee)
@@ -1754,7 +1758,8 @@ ipa_inline (void)
{
fprintf (dump_file,
"\nInlining %s size %i.\n",
- cgraph_node_name (node), inline_summary
(node)->size);
+ cgraph_node_name (node),
+ inline_summary (node)->size);
fprintf (dump_file,
" Called once from %s %i insns.\n",
cgraph_node_name (node->callers->caller),
@@ -1817,8 +1822,8 @@ inline_always_inline_functions (struct cgraph_node
if (dump_file)
fprintf (dump_file, " Inlining %s into %s (always_inline).\n",
- cgraph_node_name (e->callee),
- cgraph_node_name (e->caller));
+ xstrdup (cgraph_node_name (e->callee)),
+ xstrdup (cgraph_node_name (e->caller)));
inline_call (e, true, NULL, NULL);
inlined = true;
}
@@ -1867,8 +1872,8 @@ early_inline_small_functions (struct cgraph_node *
if (dump_file)
fprintf (dump_file, " Inlining %s into %s.\n",
- cgraph_node_name (callee),
- cgraph_node_name (e->caller));
+ xstrdup (cgraph_node_name (callee)),
+ xstrdup (cgraph_node_name (e->caller)));
inline_call (e, true, NULL, NULL);
inlined = true;
}
