1// errorcheck -0 -m
2
3// Copyright 2010 The Go Authors.  All rights reserved.
4// Use of this source code is governed by a BSD-style
5// license that can be found in the LICENSE file.
6
7// Test, using compiler diagnostic flags, that the escape analysis is working.
8// Compiles but does not run.  Inlining is enabled.
9
10package foo
11
12var p *int
13
14func alloc(x int) *int { // ERROR "can inline alloc" "moved to heap: x"
15	return &x // ERROR "&x escapes to heap"
16}
17
18var f func()
19
20func f1() {
21	p = alloc(2) // ERROR "inlining call to alloc" "&x escapes to heap" "moved to heap: x"
22
23	// Escape analysis used to miss inlined code in closures.
24
25	func() { // ERROR "func literal does not escape"
26		p = alloc(3) // ERROR "inlining call to alloc" "&x escapes to heap" "moved to heap: x"
27	}()
28
29	f = func() { // ERROR "func literal escapes to heap"
30		p = alloc(3) // ERROR "inlining call to alloc" "&x escapes to heap" "moved to heap: x"
31	}
32	f()
33}
34
35func f2() {} // ERROR "can inline f2"
36
37// No inline for panic, recover.
38func f3() { panic(1) }
39func f4() { recover() }
40
41func f5() *byte {
42	type T struct {
43		x [1]byte
44	}
45	t := new(T) // ERROR "new.T. escapes to heap"
46	return &t.x[0] // ERROR "&t.x.0. escapes to heap"
47}
48
49func f6() *byte {
50	type T struct {
51		x struct {
52			y byte
53		}
54	}
55	t := new(T) // ERROR "new.T. escapes to heap"
56	return &t.x.y // ERROR "&t.x.y escapes to heap"
57}
58