| Issue |
90946
|
| Summary |
Destructors are not called during unwinding of SEH exceptions for Windows x86 binaries with /EHa
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
momo5502
|
Building sample below with cl.exe (both x64 and x86) using `cl.exe /EHa a.cpp` yields the following expected output:
```
Destructor called
Exception thrown
```
Building it with clang-cl.exe for x86 using `clang-cl.exe -m32 /EHa a.cpp` yields the following output:
```
Destructor NOT called
Exception thrown
```
As one can see, the destructor is not being called when unwinding.
Note that compiling that sample using clang-cl for x64 works completely fine. This is only an issue with x86.
Another thing worth mentioning is that taking the code from `HandleDestructorCallWithException` and putting it directly within `CatchNativeExceptions` causes the x86 binary to crash, while x64 works fine.
The sample:
```C++
#include <cstdio>
struct Destructor {
Destructor(bool* destructorCalled) : mDestructorCalled(destructorCalled) {}
~Destructor() { *mDestructorCalled = true; }
bool* mDestructorCalled;
};
void HandleDestructorCallWithException(bool* destructorCalled)
{
Destructor x(destructorCalled);
*reinterpret_cast<int*>(1) = 1;
}
void CatchNativeExceptions(bool* destructorCalled, bool* exceptionThrown)
{
try {
HandleDestructorCallWithException(destructorCalled);
}
catch(...) {
*exceptionThrown = true;
}
}
int main()
{
bool destructorCalled = false;
bool exceptionThrown = false;
CatchNativeExceptions(&destructorCalled, &exceptionThrown);
puts(destructorCalled ? "Destructor called" : "Destructor NOT called");
puts(exceptionThrown ? "Exception thrown" : "Exception NOT thrown");
return destructorCalled && exceptionThrown ? 0 : 1;
}
```
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