A clang's plugin to extract function's prototype.
This will extract the AST from your source codes and no need to compile your code!. What you need just is running a simple command line.
Now, it supports extracting the follow types of function prototypes
- caller-callee relationships
- indirect function call prototypes
- clang 10
If you want to build this plugin by yourself, replace the file PrintFunctionNames.cpp in directory llvm-project/clang/examples/PrintFunctionNames.
Then build this plugin by make PrintFunctionNames command. And then, the PrintFunctionNames.so will apperarent at llvm-project/build/lib.
clang -fsyntax-only -Xclang -load -Xclang ./PrintFunctionNames.so -Xclang -plugin -Xclang print-fns -Xclang -plugin-arg-print-fns -Xclang ./log.file input.c
Here replace ./log.file to receive output and input file input.c.
For example, there is a c file named helloworld.c which contains:
# include <stdio.h>
int *Max(int, int); //函数声明
int main(void)
{
int* (*p)(int prt1, int ptr2); //定义一个函数指针
int a, b, *c;
p = Max; //把函数Max赋给指针变量p, 使p指向Max函数
printf("please enter a and b:");
scanf("%d%d", &a, &b);
c = (*p)(a, b); //通过函数指针调用Max函数
printf("a = %d\nb = %d\nmax = %d\n", a, b, *c);
return 0;
}
int *Max(int x, int y) //定义Max函数
{
int *z;
if (x > y)
{
*z = x;
}
else
{
*z = y;
}
return z;
}
The result are bellow:
{'function': 'main', 'return_type': 'int', 'parms': '', 'file' :'test2.c', 'begin': [3, 1], 'end': [13, 1]}
{'function': 'printf', 'return_type': 'int', 'params': 'const char *@__format,'}
{'function': 'scanf', 'return_type': 'int', 'params': 'const char *@__format,'}
{'function': 'printf', 'return_type': 'int', 'params': 'const char *@__format,'}
{'function': 'p', 'return_type': 'int *', 'params': 'int@int,int@int,'}
{'function': 'Max', 'return_type': 'int *', 'parms': 'int@x,int@y,', 'file' :'test2.c', 'begin': [14, 1], 'end': [26, 1]}