如何仅从 clang AST 获取函数声明? [英] How to get only function declaration from clang AST?

问题描述

我想为我的 C 程序使用 AST，并希望以 json 格式表示.为此，我使用了 clang -Xclang -ast-dump=json -fSyntax-only main.c 命令.它给了一个AST.但是 AST 包含 typeDecl、Value 声明 等以及 function 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.

我只需要一个函数声明，以 JSON 形式形成我的代码.怎样才能做到这一点?

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

这是一个替代的 clang-check -ast-dump -ast-dump-filter=main main.c 但这不能以 JSON 形式给出结果.当我执行这个时得到了一些错误消息以及这个简单代码的输出

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问题，与 clang frontend 和 clang driver 之间的差异有关.它甚至在 docs 中都有介绍.

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

所以，运行 clang -### main.c，复制所有 -internal-isystem 和 -internal-externc-isystem 选项并将它们添加到您运行以获取 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.

希望这些信息对您有所帮助！

I hope this information will be helpful!

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