atrosinenko wrote:
> ... (rather than requiring a jit generated frame)
IIUC it should be rather straightforward to get a stack frame without any
associated CFI by manually writing a function in assembly and not providing any
`.cfi_*` directives for it.
```c
class my_exception {
int n;
};
asm(
" .globl caller\n"
" .p2align 4\n"
" .type caller,@function\n"
"caller:\n"
" stp x29, x30, [sp, #-16]!\n"
" mov x29, sp\n"
" bl thrower\n"
" ldp x29, x30, [sp], #16\n"
" ret\n"
);
extern "C" void caller();
extern "C" void thrower() {
throw my_exception();
}
int main() {
try {
caller();
} catch (...) {
return 1;
}
return 0;
}
```
Though, I cannot make an assertion in `__unw_set_reg` trigger, I simply get
"normal" abnormal termination instead:
```
libc++abi: terminating due to uncaught exception of type my_exception
```
I guess the `__unw_set_reg` function is only called during the Unwinding Phase,
but it is not even started, as (I guess) missing debug info is already detected
during the Search Phase. What I see in debugger is that if I set breakpoints at
`unwind_phase1` and `unwind_phase2`, then I get the fatal error after I
continue execution at `unwind_phase1` (without ever hitting `unwind_phase2`).
I guess that the issue may be reproduced by performing forced unwind, as IIRC
it skips the first phase at all.
https://github.com/llvm/llvm-project/pull/184041
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