first step towards JIT

#include <stdio.h>
#include <windows.h>

typedef int (*somefn) ();

int main()
{
    char prebuf[ 512 ];
    int precnt = 0;

#define APPEND_CODE( cb, cbsize ) \
    memcpy( prebuf + precnt, cb, cbsize ); \
    precnt += cbsize;

    <$
    mov eax, 5
    add eax, eax
    ret
    $>
#undef APPEND_CODE

    while( precnt % 4 != 0 )
        prebuf[ precnt++ ] = 0x90; // padding NOP

    void* func = VirtualAlloc( NULL, precnt, MEM_COMMIT, PAGE_EXECUTE_READWRITE );
    memcpy( func, prebuf, precnt );

    int test = ((somefn)func)();
    printf( "return value: %d\n", test );

    return 0;
}