Use GCC to generate an abstract syntax tree "ast" and dump it to Dot file and visualization

reference ：https://stackoverflow.com/questions/49876942/how-to-use-graph-option-on-gccs-fdump-tree

Can pass -fdump- Command to get this information .
Example ：

// main.c

int sum(int a, int b) {
    
    return a + b;
}

int main(void) {
    
    if (sum(8, 10) < 20) {
    
        return -1;
    }
    return 1;
}

about gcc 7.3.0：

gcc -fdump-tree-all-graph main.c -o main

After that, you will get a lot .dot file

Use GraphViz You can retrieve a nice print map for each function ：

dot -Tpng main.c.012t.cfg.dot -o main.png

GCC Developer options ：https://gcc.gnu.org/onlinedocs/gcc/Developer-Options.html