https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105418
Bug ID: 105418
Summary: debug_tree does not support well for std::construct_at
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: guojiufu at gcc dot gnu.org
Target Milestone: ---
During debug GCC, when call "debug_tree" inside gdb, I found "debug_tree" fail
on "std::construct_at". It fails from "decl_as_string"
To reproduce this issue quicker, the below patch could be used.
-----------
diff --git a/gcc/cp/module.cc b/gcc/cp/module.cc
index cebf9c35c1d..ead4112dd37 100644
--- a/gcc/cp/module.cc
+++ b/gcc/cp/module.cc
@@ -4793,10 +4793,12 @@ trees_out::get_tag (tree t)
}
/* Insert T into the map, return its tag number. */
-
+const char* decl_as_string(tree, int);//void debug_tree(tree);
int
trees_out::insert (tree t, walk_kind walk)
{
+ if (TREE_CODE (t) == FUNCTION_DECL)
+ decl_as_string (t,TFF_DECL_SPECIFIERS);//debug_tree (t);
gcc_checking_assert (walk != WK_normal || !TREE_VISITED (t));
int tag = --ref_num;
bool existed;
----------
configure the GCC with below command:
$ configure --enable-languages=c,c++ --with-cpu=native --enable-checking
--with-long-double-128
--prefix=/home/guojiufu/gcc/install/gcc-mainline-base-debug --disable-bootstrap
Using test case: t.cc
-----------
#include <memory>
struct S {
int x;
float y;
double z;
S(int x, float y, double z) : x{x}, y{y}, z{z} { }
};
void foo()
{
alignas(S) unsigned char storage[sizeof(S)];
S* ptr = std::construct_at(reinterpret_cast<S*>(storage), 42, 2.71828f,
3.1415);
std::destroy_at(ptr);
}
------------
$ g++ -fmodule-header t.cc -std=gnu++20
In file included from
/home/guojiufu/gcc/build/gcc-mainline-base-debug/powerpc64le-unknown-linux-gnu/libstdc++-v3/include/bits/stl_iterator.h:85,
from
/home/guojiufu/gcc/build/gcc-mainline-base-debug/powerpc64le-unknown-linux-gnu/libstdc++-v3/include/bits/stl_algobase.h:67,
from
/home/guojiufu/gcc/build/gcc-mainline-base-debug/powerpc64le-unknown-linux-gnu/libstdc++-v3/include/memory:63,
from t.cc:1:
/home/guojiufu/gcc/build/gcc-mainline-base-debug/powerpc64le-unknown-linux-gnu/libstdc++-v3/include/bits/stl_construct.h:96:17:
internal compiler error: in perform_overload_resolution, at cp/call.cc:4710
96 | -> decltype(::new((void*)0) _Tp(std::declval<_Args>()...))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
0x106b32cb perform_overload_resolution
/home/guojiufu/gcc/gcc-mainline-base/gcc/cp/call.cc:4710
0x106b3d9f build_operator_new_call(tree_node*, vec<tree_node*, va_gc,
vl_embed>**, tree_node**, tree_node**, tree_node*, tree_node*, tree_node**,
int)
/home/guojiufu/gcc/gcc-mainline-base/gcc/cp/call.cc:4929
0x108d0743 build_new_1
/home/guojiufu/gcc/gcc-mainline-base/gcc/cp/init.cc:3412
0x108d300f build_new(unsigned int, vec<tree_node*, va_gc, vl_embed>**,
tree_node*, tree_node*, vec<tree_node*, va_gc, vl_embed>**, int, int)
/home/guojiufu/gcc/gcc-mainline-base/gcc/cp/init.cc:4014
0x10b210ef tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
/home/guojiufu/gcc/gcc-mainline-base/gcc/cp/pt.cc:20557
0x10b01ddf tsubst(tree_node*, tree_node*, int, tree_node*)
/home/guojiufu/gcc/gcc-mainline-base/gcc/cp/pt.cc:16306
0x10896f6b dump_template_bindings
/home/guojiufu/gcc/gcc-mainline-base/gcc/cp/error.cc:486
0x1089f887 dump_substitution
/home/guojiufu/gcc/gcc-mainline-base/gcc/cp/error.cc:1654
