https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101765
Bug ID: 101765
Summary: ICE when using a VLA inside of a coroutine
Product: gcc
Version: 11.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: kacper.slominski72 at gmail dot com
Target Milestone: ---
The following code, when compiled with "-std=c++20 -fcoroutines" (on GCC
versions starting from 10.1 and including trunk) causes an ICE:
#include <coroutine>
struct dummy_coro {
using promise_type = dummy_coro;
bool await_ready() noexcept { return false; }
void await_suspend(std::coroutine_handle<>) noexcept { }
void await_resume() noexcept { }
dummy_coro get_return_object() { return {}; }
dummy_coro initial_suspend() { return {}; }
dummy_coro final_suspend() noexcept { return {}; }
void return_void() { }
void unhandled_exception() { }
};
dummy_coro foo(int arg) {
char arr[arg];
co_return;
}
Compiler output from GCC 11:
<source>: In function 'dummy_coro foo(int)':
<source>:18:1: internal compiler error: Segmentation fault
18 | }
| ^
0x1786229 internal_error(char const*, ...)
???:0
0x100ff23 wi::lts_p_large(long const*, unsigned int, unsigned int, long const*,
unsigned int)
???:0
0x6a7c06 finish_struct_1(tree_node*)
???:0
0x6a9c8c finish_struct(tree_node*, tree_node*)
???:0
0x6cd958 morph_fn_to_coro(tree_node*, tree_node**, tree_node**)
???:0
0x6fd221 finish_function(bool)
???:0
0x7c47db c_parse_file()
???:0
0x896762 c_common_parse_file()
???:0
Compiler output from GCC trunk:
<source>: In function 'dummy_coro foo(int)':
<source>:18:1: internal compiler error: tree check: expected integer_cst, have
plus_expr in get_len, at tree.h:6066
18 | }
| ^
0x1dadf09 internal_error(char const*, ...)
???:0
0x69f111 tree_check_failed(tree_node const*, char const*, int, char const*,
...)
???:0
0x739efa finish_struct_1(tree_node*)
???:0
0x73ca54 finish_struct(tree_node*, tree_node*)
???:0
0x77d64c morph_fn_to_coro(tree_node*, tree_node**, tree_node**)
???:0
0x7de6df finish_function(bool)
???:0
0x914885 c_parse_file()
???:0
0xa97472 c_common_parse_file()
???:0
