有什么办法可以治愈预处理器的忧郁症吗？
我知道在我的特定情况下，我可以使用 -E 选项让预处理器吐出输出。 对于生成的代码来说，这个预处理器的输出是致命的。 例如，我有一个 4gl 应用程序，Informix 将其转换为 C，而后者又变成了可怕而丑陋的混乱。
我想要的是一个编辑器，它允许我指定有效的预处理器值并仅显示相关代码。 我在 Vim 中进行了一些非常基本的工作，匹配 #ifdef 和 #endif，但是代码中充满了更高级的结构，例如 #ifndef， #if 和 #else。 更糟糕的是，这些结构在逻辑上更加复杂，而且我认为我的 Vim 脚本编写技能不足以让我从中得到我想要的东西。 例如：
#if DLEVEL > 5
#define SIGNAL 1
#if STACKUSE == 1
#define STACK 200
#else
#define STACK 100
#endif
#else
#define SIGNAL 0
#if STACKUSE == 1
#define STACK 100
#else
#define STACK 50
#endif
#endif
#if DLEVEL == 0
#define STACK 0
#elif DLEVEL == 1
#define STACK 100
#elif DLEVEL > 5
display( debugptr );
#else
#define STACK 200
#endif
如果我想解决它，包括定义一个表达式计算器。 这必须是一个已解决的问题！ 如果您有 Vim 建议或其他建议，请告诉我。
I know that I can kick the the preprocessor to spit out output with the -E option in my particular circumstance. For generated code this preprocessor output is murderous. For example I have a 4gl application and Informix converts this into C which in turn gets spit out to a horrible ugly mess.
What I want is an editor that will allow me to specify what preprocessor values are in effect and show me only the relevant code. I have something very basic working in Vim matching #ifdef and #endif, but the code is riddled with more advanced constructs such is #ifndef, #if, and #else. To make matters worse, the constructs are logically more complex, and I don't think my Vim scripting skills are adequate for me to get what I want out of it. For example:
#if DLEVEL > 5
#define SIGNAL 1
#if STACKUSE == 1
#define STACK 200
#else
#define STACK 100
#endif
#else
#define SIGNAL 0
#if STACKUSE == 1
#define STACK 100
#else
#define STACK 50
#endif
#endif
#if DLEVEL == 0
#define STACK 0
#elif DLEVEL == 1
#define STACK 100
#elif DLEVEL > 5
display( debugptr );
#else
#define STACK 200
#endif
Includes defining an expression evaluator if I want to tackle it. This has to be a solved problem! If you have Vim suggestions or other ones please let me know.
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Eclipse CDT 编辑器可以很好地根据您声明为活动的宏来突出显示代码。 您可能想查看一下。
The Eclipse CDT editor does a pretty good job highlighting code based on the macros you declare to be active. You may want to check it out.
对于编辑器来说，Eclipse CDT 效果很好。 它显示哪些代码处于活动状态以及哪些代码被#ifdef'ed out，它在#ifdef'ed out的代码中提供语法突出显示，因此您仍然可以轻松阅读它，并且如果您使用鼠标，它可以一次单步执行一个宏扩展超过一个宏。
从命令行，
cpp -dM filename.c处理文件并仅显示有效的#defines。 例如，在您的代码中，它可能会输出，而不会与其他预处理器指令或 C/C++ 代码混淆列表。
（与此相关的是，
cpp -dM /dev/null是查找适合您平台的预定义宏的便捷方法。）For an editor, Eclipse CDT works quite well. It shows which code is active and which code is #ifdef'ed out, it provides syntax highlighting within code that's #ifdef'ed out so you can still easily read it, and it can step through macro expansions one at a time if you mouse over a macro.
From the command line,
cpp -dM filename.cprocesses a file and shows only the #defines that are in effect. For example, in your code, it might spit outwithout cluttering the listing with other preprocessor directives or with C/C++ code.
(On a related note,
cpp -dM /dev/nullis a handy way to find predefined macros for your platform.)考虑看看“Son of Unifdef”，在是否有一个 C 预处理器可以根据已定义/未定义的值消除 #ifdef 块？。 这不是一个可视化编辑器 - 然而，它会采用 C 代码（或其中包含 C 预处理器指令的代码）并生成修改后的文件，然后您可以将其与原始文件进行比较。
我对提到的 Informix 4GL (I4GL) 很好奇。 AFAIK，它生成的 C 代码并未包含
#ifdef结构。 至少，在我负责的时候，输出是不允许包含任何内容的。 （您使用的是哪个版本的 I4GL？）有很多#line条目； 这些允许您将生成的代码追踪回相应的 I4GL 源。 我有一个脚本，可以将它们转换为简单的 C 注释，以便我可以使用调试器（gdb或dbx或...破灭这个想法，sdb 或adb) 在编译后的代码上。 我还看到过预处理器（cpp和m4）用于生成 I4GL 源代码以提交给 I4GL 编译器。Consider looking at "Son of Unifdef", cited in the answer to Is there a C pre-processor which eliminates #ifdef blocks based on values defined/undefined?. This isn't a visual editor - it would, however, take C code (or code with C preprocessor directives in it) and generate a modified file which you could then compare with the original.
I'm curious about the mention of Informix 4GL (I4GL). The C code it generates is not, AFAIK, laced with
#ifdefconstructs. At least, the output was not allowed to contain any when I was in charge of it. (Which version of I4GL are you using?) There are lots of#lineentries; those permit you to chase the generated code back to the corresponding I4GL source. I have a script that converts those into simple C comments so that I can use a debugger (gdbordbxor ... perish the thought,sdboradb) on the compiled code. And I have also seen preprocessors (bothcppandm4) used to generate I4GL source code for submission to the I4GL compiler.如果您是 Linux 用户并且还使用 GNOME，那么我必须推荐 GEdit。 在安装了一些用于智能感知、文件浏览等的插件后，我真的很喜欢它......如果如果您没有运行 GNOME，但仍在使用 Linux (KDE)，您也许可以使用 Kate。 我玩它的时间不长，所以没什么可说的。 GEdit 在 KDE 中可以工作，但看起来不太正确。
如果您使用的是 Windows 并且拥有一台非常好的 PC，那么请尝试 Netbeans （是的，它也适用于 C++，而不是只是Java）。 如果没有，总是有 Visual C++ 2008（不过仍然非常依赖 RAM）。
我不确定 Mac 是否适用，因为我买不起，但 Netbeans 也可以在 Mac 上运行（以及 Linux）。
If you're a Linux user and you also use GNOME then I would have to recommend GEdit. I really loved it after I installed some plugins for Intellisense, file browsing, etc... If you're not running GNOME but are still using Linux (KDE) you might be able to use Kate. I didn't play with it for too long so I don't have much to say about that. GEdit will work in KDE but it won't look right.
If you're using Windows and have a really good PC then try Netbeans (yeah it's for C++ also, not just Java). If not there's always Visual C++ 2008 (still pretty RAM dependent though).
I'm not sure about Mac as I can't afford one, but Netbeans works on it also (as well as Linux).
Emacs 有 hide-ifdef-mode （我自己从来没有使用过它，所以我不能保证它的质量）
Emacs has hide-ifdef-mode (I've never had to use it myself, so I can't vouch for its quality)
您还可以尝试 unifdef ，它比 sunifdef 简单得多。
You can also try unifdef which is rather simpler than sunifdef.