如何在__stdcall中使用varargs而不使编译器破坏堆栈

Question

I've encountered the problem with MSVC and ICC:

I need to use a varadic arguments with an stdcall calling convention, but the compiler ignores it for varadic functions and corrupts the stack.

Easy way to fix this would be to just take the number of arguments as one of the arguments and offset ESP before it's corrupted, but in this case I don't need the number of args for the context of the function so would rather avoid it if possible.

Does somebody know if there's a way to do this?

Answer 1

As per the documentation :

The callee cleans the stack, so the compiler makes vararg functions __cdecl .

Given this, I'm not sure how you expect to proceed. If stdcall requires the callee to clean the stack, but in vararg functions the callee cannot know what's on the stack at compile-time, how would it work? Would you expect the stdarg va_list macros to manipulate the call frame? I don't think that's how Microsoft sees it, so what you're asking doesn't seem possible, at least not by writing C using the Microsoft compiler.