[llvm-bugs] [Bug 44372] New: ClangCl: windows structured exception handling doesn't work

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=44372

            Bug ID: 44372
           Summary: ClangCl: windows structured exception handling doesn't
                    work
           Product: clang
           Version: 9.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: andrii.riabushenko at barclays.com
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

Example compiles with Clang-Cl from official LLVM 9.0 64bit windows binaries
but crashes at the runtime. 
Example taken from 
https://docs.microsoft.com/en-us/cpp/cpp/try-except-statement?view=vs-2019.



#include <stdio.h>
#include <windows.h>
#include <excpt.h>

int filter(unsigned int code, struct _EXCEPTION_POINTERS *ep)
{
    puts("in filter.");
    if (code == EXCEPTION_ACCESS_VIOLATION)
    {
        puts("caught AV as expected.");
        return EXCEPTION_EXECUTE_HANDLER;
    }
    else
    {
        puts("didn't catch AV, unexpected.");
        return EXCEPTION_CONTINUE_SEARCH;
    };
}

int main()
{
    int* p = 0x00000000;   // pointer to NULL
    puts("hello");
    __try
    {
        puts("in try");
        __try
        {
            puts("in try");
            *p = 13;    // causes an access violation exception;
        }
        __finally
        {
            puts("in finally");
        }
    }
    __except(filter(GetExceptionCode(), GetExceptionInformation()))
    {
        puts("in except");
    }
    puts("world");
}



The expected output:
hello
in try
in try
in filter.
caught AV as expected.
in finally
in except
world



The actual output:
hello
in try
in try
(CRASH)

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