[llvm-bugs] [Bug 35056] New: [ms] Broken codegen around SEH and __declspec(naked) inline asm

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35056

            Bug ID: 35056
           Summary: [ms] Broken codegen around SEH and __declspec(naked)
                    inline asm
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: nicolasweber at gmx.de
                CC: llvm-bugs at lists.llvm.org

C:\src\chrome\src>type foo.cc
#include <windows.h>

__declspec(naked)
bool SafeTerminateProcess(HANDLE process, UINT exit_code) {
  __asm {
    push ebp
    mov ebp, esp
    push [ebp+12]
    push [ebp+8]
    call TerminateProcess
    test eax, eax
    setne al
    mov esp, ebp
    pop ebp
    ret
  }
}

double g() { return 0.0; }

int main() {
  __try {
    volatile int*  p = 0;
    *p = 4;
  } __except(1) {
    SafeTerminateProcess(GetCurrentProcess(), 1);
  }
}


This works in MSVC:


C:\src\chrome\src>where cl
C:\Program Files (x86)\Microsoft Visual
Studio\2017\Community\VC\Tools\MSVC\14.11.25503\bin\Hostx86\x86\cl.exe

C:\src\chrome\src>cl /nologo foo.cc
foo.cc

C:\src\chrome\src>foo

C:\src\chrome\src>echo %errorlevel%
1




But with clang-cl:

C:\src\chrome\src>"third_party\llvm-build\Release+Asserts\bin\clang-cl.exe"
foo.cc -m32

C:\src\chrome\src>foo  # This gives me "app has finished working" dialog

C:\src\chrome\src>echo %errorlevel%
-1073741819

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