可以clang生成一个Xcode项目的调用图（在Objective-C？ [英] Can clang generate a call graph for an Xcode project (in Objective-C?

问题描述

我发现此示例看起来像它输出了我想要的C ++。如何在Xcode项目中为Objective-C代码做？

I found this example that looks like it outputs what I want for C++. How can it be done for the Objective-C code in an Xcode project?

我看到提到的Doxygen能够创建一个调用图，但我找不到一个例子。

I see mentions of Doxygen being able to create a call graph, but I can't find an example.

（我想更好地了解clang，但很难开始...）

(I want to get to know clang better, but it's hard to get started...)

推荐答案

首先，您需要一个兼容的版本 opt

First, you need a compatible version of opt, since it doesn't come with the LLVM Apple ships. I got mine from macports:

port install llvm-3.0

然后你需要编译你的文件。制定参数有时可能有点痛苦。最简单的方法是让Xcode构建它，然后去日志，剪切和粘贴出巨大的构建线。我以前能够手动攻击这些，但我已经太懒了。

Then you need to compile your file. Working out the parameters can sometimes be a bit of a pain. The easiest way is to let Xcode build it, then go to the logs and cut and paste out the giant build line. I used to be able to hand-hack these, but I've gotten too lazy....

取出最后一个 -o 参数（方便地在编译行的结尾），并替换：

Take out the last -o parameter (conveniently at the end of the compile line), and substitute:

-S -emit-llvm -o - | opt-mp-3.0 -analyze -dot-callgraph

p>

Then, as in the other example:

$ dot -Tpng -ocallgraph.png callgraph.dot

请记住，有几个函数在ObjC中被称为很多，几乎从不关心。特别是，几乎任何以 objc _ 开头的。幸运的是，DOT格式是一个非常简单的文本文件，很容易编写后处理脚本去除你不想要的东西。

Keep in mind that there are a few functions that get called a lot in ObjC that you almost never care about. In particular, almost anything that starts with objc_. Luckily the DOT format is a very simple text file, and it's pretty easy to write post-processing scripts to strip out what you don't want.

还有一个 -print-callgraph 参数，如果您想要进一步处理，将以略有不同的格式显示此信息。

There's also a -print-callgraph parameter that will out put this information in a slightly different format if you want to do further processing.

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