Bug in x86 inline assembly to watch out for

Kevin Frei

17 Oct 2006 4:53 PM

Comments 2

Imagine this very lame code:

int main() {}

void BugAsm() 
{
   __asm {
        MOV     [ESP+12],OFFSET main
   }
}

void(*BugAsmPt)()=&BugAsm; // this is just to make sure the function is not removed by /OPT:REF

Now imagine your significantly less lame code doing something similar.
Now imagine that the compiler crashes with a bizzare message about "x86\code.c" something or other.

Well, you can fix this problem by changing the assembly code to this:

mov DWORD PTR[esp+12], OFFSET main

Another unfixed bug, worked around :-|

-Kev

Bugs