call graph

[aben20807]

https://stackoverflow.com/a/5373814

static void D() { }
static void Y() { D(); }
static void X() { Y(); }
static void C() { D(); X(); }
static void B() { C(); }
static void S() { D(); }
static void P() { S(); }
static void O() { P(); }
static void N() { O(); }
static void M() { N(); }
static void G() { M(); }
static void A() { B(); G(); }

int main() {
  A();
}

$ vim t.cpp
$ clang++ -S -emit-llvm t.cpp -o - | opt -analyze -dot-callgraph
$ cat callgraph.dot | 
   c++filt | 
   sed 's,>,\\>,g; s,-\\>,->,g; s,<,\\<,g' | 
   awk '/external node/{id=$1} $1 != id' | 
   dot -Tpng -ocallgraph.png
$ eog callgraph.png

[aben20807]

https://stackoverflow.com/a/15804010 https://gcc.gnu.org/onlinedocs/gcc/Developer-Options.html

gcc test.c -fdump-tree-all-graph