如何仅从cast AST获得函数声明？ [英] How to get only function declaration from clang AST?

问题描述

我的C程序需要AST，并希望以json格式表示。为此，我使用了 clang -Xclang -ast-dump = json -f仅语法main.c 命令。它给了AST。但是AST包含 typeDecl，值声明等，以及函数声明。

I want AST for my C program and want represent in json format. To do so I used clang -Xclang -ast-dump=json -fSyntax-only main.c command. It gave a AST. but the AST contains typeDecl, Value declaration etc. along with function declaration.

我只希望以JSON形式的代码声明函数。

I want only a function declaration form my code in JSON form. How can achieve this?

这里是另一种 clang-check -ast-dump -ast-dump-filter = main main.c ，但这不能以JSON形式给出结果。当我执行此操作时，得到了一些错误消息以及此简单代码的输出

Here is an alternative clang-check -ast-dump -ast-dump-filter=main main.c but this cant give the result in JSON form. and when I execute this got some error messages along with output for this simple code

#include <stdio.h>
int main() {
    printf("Hello from C!");
        return 0;
}

Error while trying to load a compilation database:
Could not auto-detect compilation database for file "main.c"
No compilation database found in /home/..../src or any parent directory
fixed-compilation-database: Error while opening fixed database: No such file or directory
json-compilation-database: Error while opening JSON database: No such file or directory
Running without flags.

推荐答案

这是一个众所周知的与差异有关的问题在 clang前端和 clang驱动程序之间。甚至在文档中也有介绍。

It is a well-known issue connected to the differences between clang frontend and clang driver. It is even covered in docs.

因此，运行 clang-### main.c ，复制所有 -internal-isystem 和 -internal-externc-isystem 选项，并将它们添加到运行以获取AST的命令中。

So, run clang -### main.c, copy all -internal-isystem and -internal-externc-isystem options and add them to the command that you run to get AST.

I希望这些信息对您有所帮助！

I hope this information will be helpful!

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