[LLVMbugs] [Bug 21155] New: Regression: Incorrect warning about unused labels when label is used from inline asm

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21155

            Bug ID: 21155
           Summary: Regression: Incorrect warning about unused labels when
                    label is used from inline asm
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: nicolasweber at gmx.de
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

..\..\sandbox\win\src\sidestep_resolver.cc(179,3) :  warning(clang): unused
label 'call_interceptor' [-Wunused-label]
  call_interceptor:
~~^~~~~~~~~~~~~~~~~

for:

__declspec(naked)
void SmartSidestepResolverThunk::SmartStub() {
  __asm {
    push eax                  // Space for the jump.
    push eax                  // Save registers.
    push ebx
    push ecx
    push edx
    mov ebx, [esp + 0x18]     // First parameter = SmartThunk.
    mov edx, [esp + 0x14]     // Get the return address.
    mov eax, [ebx]SmartThunk.module_base
    push edx
    push eax
    call SmartSidestepResolverThunk::IsInternalCall
    add esp, 8

    test eax, eax
    lea edx, [ebx]SmartThunk.sidestep   // The original function.
    jz call_interceptor

    // Skip this call
    mov ecx, [esp + 0x14]               // Return address.
    mov [esp + 0x18], ecx               // Remove first parameter.
    mov [esp + 0x10], edx
    pop edx                             // Restore registers.
    pop ecx
    pop ebx
    pop eax
    ret 4                               // Jump to original function.

  call_interceptor:
    mov ecx, [ebx]SmartThunk.interceptor
    mov [esp + 0x18], edx               // Replace first parameter.
    mov [esp + 0x10], ecx
    pop edx                             // Restore registers.
    pop ecx
    pop ebx
    pop eax
    ret                                 // Jump to original function.
  }
}



Maybe caused by r218230?

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