https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119852
Bug ID: 119852
Summary: The output of -fdump-ipa-clones can contain "(null)"
as the suffix/reason for cloning
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: ipa
Assignee: unassigned at gcc dot gnu.org
Reporter: jamborm at gcc dot gnu.org
CC: hubicka at gcc dot gnu.org
Target Milestone: ---
The output of -fdump-ipa-clones can contain "(null)" as the
suffix/reason for cloning, for example when compiling our own testcase
testsuite/gcc.dg/ipa/pr58106.c:
~/gcc/trunk/inst/bin/gcc -O3 -S -fdump-ipa-clones
~/gcc/trunk/src/gcc/testsuite/gcc.dg/ipa/pr58106.c
the generated file contains entries:
Callgraph
clone;for_each_rtx_1.isra.0;1;/home/mjambor/gcc/trunk/src/gcc/testsuite/gcc.dg/ipa/pr58106.c;28;1;for_each_rtx_1.isra.0;1;/home/mjambor/gcc/trunk/src/gcc/testsuite/gcc.dg/ipa/pr58106.c;28;1;(null)
Callgraph
clone;for_each_rtx_1.constprop.0.isra.0;1;/home/mjambor/gcc/trunk/src/gcc/testsuite/gcc.dg/ipa/pr58106.c;28;1;for_each_rtx_1.constprop.0.isra.0;1;/home/mjambor/gcc/trunk/src/gcc/testsuite/gcc.dg/ipa/pr58106.c;28;1;(null)
These are apparently results of the following snippet from function
recursive_inlining in ipa-inline.c:
/* We need original clone to copy around. */
master_clone = node->create_clone (node->decl, node->count,
false, vNULL, true, NULL, NULL);
I guess in this case we should simply not output any record of the
clone used for copying stuff. However there is one more invocation of
create_clone with both parameters new_inlined_to and suffix set to
NULL which could lead to the same result in function input_node in
lto-cgraph.cc:
clone_ref = streamer_read_hwi (ib);
bool has_thunk_info;
fn_decl = lto_input_fn_decl_ref (ib, file_data);
if (clone_ref != LCC_NOT_FOUND)
{
node = dyn_cast<cgraph_node *> (nodes[clone_ref])->create_clone (fn_decl,
profile_count::uninitialized (), false,
vNULL, false, NULL, NULL);
}
Because of -fdump-ipa-clones, I'd also argue that the suffix parameter
of create_clone should not default to NULL too.
