Hi!
In my recent rtti.cc change I assumed when emitting the support tinfos
that the tinfos for the fundamental types haven't been created yet.
Normally (in libsupc++.a (fundamental_type_info.o)) that is the case,
but as can be seen on the testcase, one can violate it by using typeid
etc. in the same TU and do it before ~__fundamental_type_info ()
definition.
The following patch fixes that by popping from unemitted_tinfo_decls
only in the normal case when it is there, and treating non-NULL
DECL_INITIAL on a tinfo node as indication that emit_tinfo_decl has
processed it already.
Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
2023-03-07 Jakub Jelinek <ja...@redhat.com>
PR c++/109042
* rtti.cc (emit_support_tinfo_1): Don't assert that last
unemitted_tinfo_decls element is tinfo, instead pop from it only in
that case.
* decl2.cc (c_parse_final_cleanups): Don't call emit_tinfo_decl
for unemitted_tinfO_decls which have already non-NULL DECL_INITIAL.
* g++.dg/rtti/pr109042.C: New test.
--- gcc/cp/rtti.cc.jj 2023-03-03 00:34:52.028567946 +0100
+++ gcc/cp/rtti.cc 2023-03-06 19:06:27.433307136 +0100
@@ -1581,10 +1581,10 @@ emit_support_tinfo_1 (tree bltn)
/* Emit it right away if not emitted already. */
if (DECL_INITIAL (tinfo) == NULL_TREE)
{
- gcc_assert (unemitted_tinfo_decls->last () == tinfo);
bool ok = emit_tinfo_decl (tinfo);
gcc_assert (ok);
- unemitted_tinfo_decls->pop ();
+ if (unemitted_tinfo_decls->last () == tinfo)
+ unemitted_tinfo_decls->pop ();
}
}
}
--- gcc/cp/decl2.cc.jj 2023-01-18 16:11:47.053213397 +0100
+++ gcc/cp/decl2.cc 2023-03-06 19:07:16.830582984 +0100
@@ -4982,7 +4982,7 @@ c_parse_final_cleanups (void)
get emitted. */
for (i = unemitted_tinfo_decls->length ();
unemitted_tinfo_decls->iterate (--i, &t);)
- if (emit_tinfo_decl (t))
+ if (DECL_INITIAL (t) || emit_tinfo_decl (t))
{
reconsider = true;
unemitted_tinfo_decls->unordered_remove (i);
--- gcc/testsuite/g++.dg/rtti/pr109042.C.jj 2023-03-06 19:11:06.995208812
+0100
+++ gcc/testsuite/g++.dg/rtti/pr109042.C 2023-03-06 19:10:59.117324298
+0100
@@ -0,0 +1,20 @@
+// PR c++/109042
+// { dg-do compile }
+
+namespace std { class type_info {}; }
+
+std::type_info
+foo ()
+{
+ return typeid (void);
+}
+
+namespace __cxxabiv1 {
+ struct __fundamental_type_info {
+ virtual ~__fundamental_type_info ();
+ };
+
+ __fundamental_type_info::~__fundamental_type_info ()
+ {
+ }
+}
Jakub
