进入用C的64位应用程序转换32位应用程序 [英] Converting 32-bit Application Into 64-bit Application in C

问题描述

我是presently在做这个应用程序转换一个32位应用程序转换为64位应用程序在C目前正在对x86架构（在Windows，OSX，UNIX，LINUX）。因此，在开始编码之前，我想知道我需要什么，而转换应用程序来考虑。

解决方案

1. 找到是谁写的。他们是白痴？难道他们的您从几年前的？你可以问他们问题吗？他们是熟悉的多个平台和系统的存在？知道的程序的将帮助您了解的问题，当你碰到他们的作者（S）的思维定式。


2. 获取一个64位计算机/编译环境和运行。


3. 与诠释长进行更换。要非常清楚，长不是长。


4. 替换（INT）及X 蒙上和打字使用intptr_t 和（无符号INT）及X 与 uintptr_t形式


5. 审核任何依赖于铸造结构，以的char * 做指针运算它。


6. 正则表达式搜索\\ 4; \\>如果你假定 4 = sizeof的（无效*）


7. 要有耐心。当你发现一个问题，看看其他地方是否存在同样的问题，并包装在宏观的解决方案。


8. 尝试不使用 #IFDEF RUN64 或任何类似。你会后悔的，如果128位平台的不断进入流行。


9. 封装所有的变化，那会掩盖其他地方的便携性差异在程序集中的一些宏条款。


10. 使用的覆盖测试，以帮助确保你已经覆盖了一切（如适用）

的修改的形式加入的评论所说 uintptr_t形式注意：

I am presently working on converting a 32bits application into a 64bits application in C. This application is currently working on x86 architecture (Windows, osx, Unix, Linux). So, before starting coding, I wanted to know what do I need to consider while converting the application.

解决方案

1. Find out who wrote it. Are they an idiot? Are they you from a few years ago? Can you ask them questions? Are they familiar with the existence of multiple platforms and systems? Knowing the mind-set of the author(s) of the program will help you understand problems when you run into them.
2. Get a 64-bit machine/build environment up and running.
3. Replace long with int. Be perfectly aware that LONG is not long.
4. Replace (int)&x casts and typing with intptr_t and (unsigned int)&x with uintptr_t
5. Audit anything that relies on casting structures to char* to do pointer arithmetic with it.
6. Regex search for \<4\> in case you assumed 4 = sizeof(void*)
7. Be patient. When you find a problem, look elsewhere if the same problem exists, and wrap the solution in a macro.
8. Try not to use #ifdef RUN64 or anything similar. You'll regret it if 128-bit platforms ever go into vogue.
9. Encapsulate all of your changes in terms of some centralized macros that'll hide the portability differences elsewhere in your program.
10. Use a coverage tester to help make sure you've covered everything (if appropriate)

EDIT added uintptr_t note as suggested by comment.

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