[英]Visual-C++ inline assembler compiled incorrectly
Recently I've asked the Community about difference of two offsets Visual-C++ inline assembler difference of two offsets and got reply quickly, thanks a lot. 最近,我向社区询问了两个偏移量的差异Visual-C ++内联汇编程序两个偏移量的差异,并很快得到了答复,非常感谢。 Now I've came into other problem, which is worse.
现在我遇到了另一个问题,那就是更糟。
I have an instruction like 我有一条指令
..naked...
__asm{
...
mov eax, dword ptr [ebx + offset data1]
...
}
The real problem is that it gets compiled as 真正的问题是它被编译为
mov eax, [offset data1]
No compiler warnings (/WAll mode) on this line, but code is changed and changed a lot - imagine, it got thrown ebx + part at all! 此行上没有编译器警告(/ WAll模式),但是代码已更改并且更改了很多-想象一下,它完全抛出了ebx +部分! Silently.
默默。 Is it a compiler bug or a feature?
是编译器错误还是功能? Maybe I have to specify some additional flag?
也许我必须指定一些其他标志?
Problem is with offset only, since 问题仅在于偏移量,因为
mov eax, dword ptr [ebx + 0xconst]
is compiled correctly. 正确编译。
Yes, I can get around with code 是的,我可以解决代码
mov eax, offset data1
add eax, ebx
mov eax, [eax]
But there's a lot of code to be changed then. 但是那时有很多代码需要更改。 What bothers me is absence of any warnings;
困扰我的是没有任何警告。
Finally, I have found an answer on MSDN forum. 最后,我在MSDN论坛上找到了答案。 If you use simply mov eax, [ebx + data1location], not mov eax, [ebx + offset data1location], it is compiled correctly.
如果仅使用mov eax [ebx + data1location],而不是mov eax [ebx + offset data1location],则会正确编译它。 However, 'offset' is a legal keyword for MASM syntax that ought to be accepted by MS C++ compiler.
但是,“偏移”是MASM语法的合法关键字,MS C ++编译器应接受。 But then "ebx +" is silently thrown away.
但是随后“ ebx +”被无声地丢弃了。
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