go/test/inline.go

// errorcheck -0 -m

// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Test, using compiler diagnostic flags, that inlining is working.
// Compiles but does not run.

package foo

import "unsafe"

func add2(p *byte, n uintptr) *byte { // ERROR "can inline add2" "leaking param: p to result"
	return (*byte)(add1(unsafe.Pointer(p), n)) // ERROR "inlining call to add1"
}

func add1(p unsafe.Pointer, x uintptr) unsafe.Pointer { // ERROR "can inline add1" "leaking param: p to result"
	return unsafe.Pointer(uintptr(p) + x)
}

func f(x *byte) *byte { // ERROR "can inline f" "leaking param: x to result"
	return add2(x, 1) // ERROR "inlining call to add2" "inlining call to add1"
}

//go:noinline
func g(x int) int {
	return x + 1
}

func h(x int) int { // ERROR "can inline h"
	return x + 2
}

func i(x int) int { // ERROR "can inline i"
	const y = 2
	return x + y
}

func j(x int) int { // ERROR "can inline j"
	switch {
	case x > 0:
		return x + 2
	default:
		return x + 1
	}
}

// can't currently inline functions with a break statement
func switchBreak(x, y int) int {
	var n int
	switch x {
	case 0:
		n = 1
	Done:
		switch y {
		case 0:
			n += 10
			break Done
		}
		n = 2
	}
	return n
}

// can't currently inline functions with a type switch
func switchType(x interface{}) int { // ERROR "switchType x does not escape"
	switch x.(type) {
	case int:
		return x.(int)
	default:
		return 0
	}
}