public inbox for gcc-cvs@sourceware.org
help / color / mirror / Atom feed
* [gcc r13-6438] debug/108772 - ICE with late debug generated with -flto
@ 2023-03-03 7:27 Richard Biener
0 siblings, 0 replies; only message in thread
From: Richard Biener @ 2023-03-03 7:27 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:33ca5c92dfa7e2f591a838bb768d9d6eea56793b
commit r13-6438-g33ca5c92dfa7e2f591a838bb768d9d6eea56793b
Author: Richard Biener <rguenther@suse.de>
Date: Wed Mar 1 10:01:10 2023 +0100
debug/108772 - ICE with late debug generated with -flto
When combining -g1 with -flto we run into the DIE location annotation
machinery for globals calling dwarf2out_late_global_decl but not
having any early generated DIE for function scope statics. In
this process we'd generate a limbo DIE since also the function scope
doesn't have any early generated DIE. The limbo handling then tries
to force a DIE for the context chain which ultimatively fails and
ICEs at the std namespace decl because at -g1 we don't represent that.
The following avoids this situation by making sure to never generate
any DIEs from dwarf2out_late_global_decl in the in_lto_p path
for function scope globals but rely on DIE generation for
the function to output a DIE for the local static (which doesn't
happen for -g1).
I explored a lot of other options to fix this but in the end this
seems to be the most spot-on fix with the least risk of unwanted
effects.
PR debug/108772
* dwarf2out.cc (dwarf2out_late_global_decl): Do not
generate a DIE for a function scope static.
* g++.dg/lto/pr108772_0.C: New testcase.
Diff:
---
gcc/dwarf2out.cc | 5 +++-
gcc/testsuite/g++.dg/lto/pr108772_0.C | 46 +++++++++++++++++++++++++++++++++++
2 files changed, 50 insertions(+), 1 deletion(-)
diff --git a/gcc/dwarf2out.cc b/gcc/dwarf2out.cc
index 1f39df3b1e2..1711ad2c2da 100644
--- a/gcc/dwarf2out.cc
+++ b/gcc/dwarf2out.cc
@@ -27282,7 +27282,10 @@ dwarf2out_late_global_decl (tree decl)
/* We may have to generate full debug late for LTO in case debug
was not enabled at compile-time or the target doesn't support
the LTO early debug scheme. */
- if (! die && in_lto_p)
+ if (! die && in_lto_p
+ /* Function scope variables are emitted when emitting the
+ DIE for the function. */
+ && ! local_function_static (decl))
dwarf2out_decl (decl);
else if (die)
{
diff --git a/gcc/testsuite/g++.dg/lto/pr108772_0.C b/gcc/testsuite/g++.dg/lto/pr108772_0.C
new file mode 100644
index 00000000000..81f15a90a3e
--- /dev/null
+++ b/gcc/testsuite/g++.dg/lto/pr108772_0.C
@@ -0,0 +1,46 @@
+// { dg-lto-do link }
+// { dg-require-effective-target shared }
+// { dg-require-effective-target fpic }
+// { dg-lto-options { "-flto -fPIC -shared -O1 -fimplicit-constexpr -g1" } }
+// { dg-extra-ld-options "-shared" }
+
+namespace std {
+struct _Sp_counted_base {
+ virtual void *_M_get_deleter(const int &);
+};
+bool _S_eq(int);
+struct _Sp_make_shared_tag {
+ static const int &_S_ti() {
+ static constexpr char __tag{};
+ return reinterpret_cast<const int &>(__tag);
+ }
+};
+struct _Impl {
+ _Impl(int);
+};
+int _Sp_counted_ptr_inplace___a;
+struct _Sp_counted_ptr_inplace : _Sp_counted_base {
+ _Sp_counted_ptr_inplace() : _M_impl(_Sp_counted_ptr_inplace___a) {}
+ void *_M_get_deleter(const int &__ti) {
+ auto __ptr(_M_ptr());
+ &__ti == &_Sp_make_shared_tag::_S_ti() || _S_eq(__ti);
+ return __ptr;
+ }
+ int *_M_ptr();
+ _Impl _M_impl;
+};
+struct __shared_count {
+ __shared_count(int, int) { _Sp_counted_ptr_inplace(); }
+};
+int _M_ptr;
+struct __shared_ptr {
+ template <typename _Alloc>
+ __shared_ptr(_Alloc __tag) : _M_refcount(_M_ptr, __tag) {}
+ __shared_count _M_refcount;
+};
+int shared_ptr___tag;
+struct shared_ptr : __shared_ptr {
+ shared_ptr() : __shared_ptr(shared_ptr___tag) {}
+};
+void ArgEq() { shared_ptr(); }
+} // namespace std
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2023-03-03 7:27 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-03-03 7:27 [gcc r13-6438] debug/108772 - ICE with late debug generated with -flto Richard Biener
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).