c++ - 由于 LARGEADDRESSAWARE 检测指针算术

Question

我想将我的应用程序切换到 LARGEADDRESSAWARE。需要注意的问题之一是指针运算，因为指针差异不能再表示为带符号的 32b。

有什么方法可以在大型 C++ 项目中自动查找指针减法的所有实例吗？

如果没有，是否有一些“最省力”的手动或半自动方法如何实现？

Answer 1

PC-Lint 可以发现这类问题。

看http://gimpel-online.com/MsgRef.html , 错误代码 947:

Subtract operator applied to pointers -- An expression of the form p - q was found where both p and q are pointers. This is of special importance in cases where the maximum pointer can overflow the type that holds pointer differences. For example, suppose that the maximum pointer is 3 Gigabytes -1, and that pointer differences are represented by a long, where the maximum long is 2 Gigabytes -1. Note that both of these quantities fit within a 32 bit word. Then subtracting a small pointer from a very large pointer will produce an apparent negative value in the long representing the pointer difference. Conversely, subtracting a very large pointer from a small pointer can produce a positive quantity.