oracle/testdata/src/main/calls.go

package main

// Tests of call-graph queries.
// See go.tools/oracle/oracle_test.go for explanation.
// See calls.golden for expected query results.

func A(x *int) { // @describe describe-A-x "x"
	// @callers callers-A "^"
	// @callstack callstack-A "^"
}

func B(x *int) { // @describe describe-B-x "x"
	// @callers callers-B "^"
}

// apply is not (yet) treated context-sensitively.
func apply(f func(x *int), x *int) {
	f(x) // @callees callees-apply "f"
	// @callers callers-apply "^"
}

// store *is* treated context-sensitively,
// so the points-to sets for pc, pd are precise.
func store(ptr **int, value *int) {
	*ptr = value
	// @callers callers-store "^"
}

func call(f func() *int) {
	// Result points to anon function.
	f() // @describe describe-result-f "f"

	// Target of call is anon function.
	f() // @callees callees-main.call-f "f"

	// @callers callers-main.call "^"
}

func main() {
	var a, b int
	apply(A, &a) // @callees callees-main-apply1 "app"
	apply(B, &b)

	var c, d int
	var pc, pd *int // @describe describe-pc "pc"
	store(&pc, &c)
	store(&pd, &d)
	_ = pd // @describe describe-pd "pd"

	call(func() *int {
		// We are called twice from main.call
		// @callers callers-main.anon "^"
		return &a
	})

	// Errors
	_ = "no function call here"   // @callees callees-err-no-call "no"
	print("builtin")              // @callees callees-err-builtin "builtin"
	_ = string("type conversion") // @callees callees-err-conversion "str"
	call(nil)                     // @callees callees-err-bad-selection "call\\(nil"
	if false {
		main() // @callees callees-err-deadcode1 "main"
	}
	var nilFunc func()
	nilFunc() // @callees callees-err-nil-func "nilFunc"
	var i interface {
		f()
	}
	i.f() // @callees callees-err-nil-interface "i.f"
}

func deadcode() {
	main() // @callees callees-err-deadcode2 "main"
	// @callers callers-err-deadcode "^"
	// @callstack callstack-err-deadcode "^"
}

// This code belongs to init.
var global = 123 // @callers callers-global "global"

// init may be called by other packages' inits, or in this case, the
// root of the callgraph.
func init() {
	// @callers callers-init "^"

}