Improve callgraph field dereference

[picatz]

Summary

• recursively traverse newly discovered functions when building call graph
• added test ensuring struct function fields are recognized

Testing

• go test ./...

---

https://chatgpt.com/codex/tasks/task_e_6867011b30b8833186aeb5dd0b7928b0

[picatz]

Very cool, I can see it finds the path:

taint/callgraphutil/testdata/struct_field_simple.go

Lines 8 to 53 in d1e1289

	type command struct {
	name string
	run func(args []string) error
	}
	type commands []*command
	func (c commands) run(args []string) error {
	for i := 0; i < len(c); i++ {
	cmd := c[i]
	if cmd.name == args[0] {
	return cmd.run(args[1:])
	}
	}
	return fmt.Errorf("unknown command: %s", args[0])
	}
	type cli struct {
	commands commands
	}
	func (c *cli) run(args []string) error {
	return c.commands.run(args)
	}
	func doSomething() error {
	fmt.Println("doing something")
	return nil
	}
	func main() {
	c := &cli{
	commands{
	{
	name: "do-something",
	run: func(args []string) error {
	return doSomething()
	},
	},
	},
	}
	if err := c.run(os.Args[1:]); err != nil {
	panic(err)
	}
	}

n0:main → n4:(*cli).run → n5:(commands).run → n2:main$1 → n1:doSomething