[llvm-bugs] [Bug 35056] New: [ms] Broken codegen around SEH and __declspec(naked) inline asm
via llvm-bugs
llvm-bugs at lists.llvm.org
Tue Oct 24 05:08:59 PDT 2017
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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