GkvJwa wrote:
The cause of the crash was
```
if (IsEHa) {
const BasicBlock *EntryBB = &(Fn->getEntryBlock());
calculateSEHStateForAsynchEH(EntryBB, -1, FuncInfo);
}
->
calculateSEHStateForAsynchEH(The default state is -1
int State = WI->State; // State = -1
->
However, if state cannot be reassigned, and the current Fn is seh_try_end
else if (Fn && Fn->isIntrinsic() &&
Fn->getIntrinsicID() == Intrinsic::seh_try_end)
// end of current state, retrive new state from UnwindMap
It will be executed up to this point.
State = EHInfo.SEHUnwindMap[State].ToState; // State = -1
EHInfo.SEHUnwindMap[-1]
// Therefore, I checked whether the value was greater than 0 before reading
data from the vector.
```
class aa {
public:
static aa bb();
~aa();
};
void Foo(const int* p) {
int d = 0;
__try {
d = *p;
} __except (1) {
::aa::bb();
}
}
```
> @GkvJwa `The calculateSEHStateNumbers function currently does NOT know about
> C++ EH constructs like the emitted seh_scope_begin. We simply skip over it in
> the state numbering which causes the issue.``__C_specific_handler`因此，LLC
> 的正确拒绝模式应该是包含 SEH（非 CXX）个性的函数`seh_scope_begin`。LLVM
> 目前无法正确处理这种情况。而且我认为它不应该尝试这样做。
>
> 我认为 Clang 应该在前端捕获到这个问题，并生成类似的错误信息`C2712`。
It's okay, we can handle this simply first, and then improve SEH support later
(I also encountered this problem during compilation. After reproducing it and
creating a demo, I tried it with MSVC and found that it wasn't supported.)
https://github.com/llvm/llvm-project/pull/172287
_______________________________________________
cfe-commits mailing list
[email protected]
https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
