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* [gcc r13-3277] c++: ICE with VEC_INIT_EXPR and defarg [PR106925]
@ 2022-10-13 15:06 Marek Polacek
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From: Marek Polacek @ 2022-10-13 15:06 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:3130e70dab1e64a7b014391fe941090d5f3b6b7d
commit r13-3277-g3130e70dab1e64a7b014391fe941090d5f3b6b7d
Author: Marek Polacek <polacek@redhat.com>
Date: Tue Oct 11 14:16:54 2022 -0400
c++: ICE with VEC_INIT_EXPR and defarg [PR106925]
Since r12-8066, in cxx_eval_vec_init we perform expand_vec_init_expr
while processing the default argument in this test. At this point
start_preparsed_function hasn't yet set current_function_decl.
expand_vec_init_expr then leads to maybe_splice_retval_cleanup which
checks DECL_CONSTRUCTOR_P (current_function_decl) without checking that
c_f_d is non-null first. It seems correct that c_f_d is null here, so
it seems to me that maybe_splice_retval_cleanup should check c_f_d as
in the following patch.
PR c++/106925
gcc/cp/ChangeLog:
* except.cc (maybe_splice_retval_cleanup): Check current_function_decl.
Make the bool const.
gcc/testsuite/ChangeLog:
* g++.dg/cpp0x/initlist-defarg3.C: New test.
Diff:
---
gcc/cp/except.cc | 7 +++++--
gcc/testsuite/g++.dg/cpp0x/initlist-defarg3.C | 13 +++++++++++++
2 files changed, 18 insertions(+), 2 deletions(-)
diff --git a/gcc/cp/except.cc b/gcc/cp/except.cc
index 703d1d566c9..2677a9b7678 100644
--- a/gcc/cp/except.cc
+++ b/gcc/cp/except.cc
@@ -1307,9 +1307,12 @@ maybe_splice_retval_cleanup (tree compound_stmt)
{
/* If we need a cleanup for the return value, add it in at the same level as
pushdecl_outermost_localscope. And also in try blocks. */
- bool function_body
+ const bool function_body
= (current_binding_level->level_chain
- && current_binding_level->level_chain->kind == sk_function_parms);
+ && current_binding_level->level_chain->kind == sk_function_parms
+ /* When we're processing a default argument, c_f_d may not have been
+ set. */
+ && current_function_decl);
if ((function_body || current_binding_level->kind == sk_try)
&& !DECL_CONSTRUCTOR_P (current_function_decl)
diff --git a/gcc/testsuite/g++.dg/cpp0x/initlist-defarg3.C b/gcc/testsuite/g++.dg/cpp0x/initlist-defarg3.C
new file mode 100644
index 00000000000..5c3e886b306
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/initlist-defarg3.C
@@ -0,0 +1,13 @@
+// PR c++/106925
+// { dg-do compile { target c++11 } }
+
+struct Foo;
+template <int _Nm> struct __array_traits { typedef Foo _Type[_Nm]; };
+template <int _Nm> struct array {
+ typename __array_traits<_Nm>::_Type _M_elems;
+};
+template <int size> struct MyVector { array<size> data{}; };
+struct Foo {
+ float a{0};
+};
+void foo(MyVector<1> = MyVector<1>());
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