1// errorcheck -0 -m -l
2
3// Copyright 2015 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 escape analysis for closure arguments.
8
9package escape
10
11var sink interface{}
12
13func ClosureCallArgs0() {
14	x := 0         // ERROR "moved to heap: x"
15	func(p *int) { // ERROR "p does not escape" "func literal does not escape"
16		*p = 1
17		// BAD: x should not escape to heap here
18	}(&x) // ERROR "&x escapes to heap"
19}
20
21func ClosureCallArgs1() {
22	x := 0 // ERROR "moved to heap: x"
23	for {
24		func(p *int) { // ERROR "p does not escape" "func literal does not escape"
25			*p = 1
26			// BAD: x should not escape to heap here
27		}(&x) // ERROR "&x escapes to heap"
28	}
29}
30
31func ClosureCallArgs2() {
32	for {
33		// BAD: x should not escape here
34		x := 0         // ERROR "moved to heap: x"
35		func(p *int) { // ERROR "p does not escape" "func literal does not escape"
36			*p = 1
37		}(&x) // ERROR "&x escapes to heap"
38	}
39}
40
41func ClosureCallArgs3() {
42	x := 0         // ERROR "moved to heap: x"
43	func(p *int) { // ERROR "leaking param: p" "func literal does not escape"
44		sink = p // ERROR "p escapes to heap"
45	}(&x) // ERROR "&x escapes to heap"
46}
47
48func ClosureCallArgs4() {
49	// BAD: x should not leak here
50	x := 0                  // ERROR "moved to heap: x"
51	_ = func(p *int) *int { // ERROR "leaking param: p to result ~r1" "func literal does not escape"
52		return p
53	}(&x) // ERROR "&x escapes to heap"
54}
55
56func ClosureCallArgs5() {
57	x := 0                     // ERROR "moved to heap: x"
58	sink = func(p *int) *int { // ERROR "leaking param: p to result ~r1" "func literal does not escape"
59		return p
60	}(&x) // ERROR "&x escapes to heap" "\(func literal\)\(&x\) escapes to heap"
61}
62
63func ClosureCallArgs6() {
64	x := 0         // ERROR "moved to heap: x"
65	func(p *int) { // ERROR "moved to heap: p" "func literal does not escape"
66		sink = &p // ERROR "&p escapes to heap"
67	}(&x) // ERROR "&x escapes to heap"
68}
69
70func ClosureCallArgs7() {
71	var pp *int
72	for {
73		x := 0         // ERROR "moved to heap: x"
74		func(p *int) { // ERROR "leaking param: p" "func literal does not escape"
75			pp = p
76		}(&x) // ERROR "&x escapes to heap"
77	}
78	_ = pp
79}
80
81func ClosureCallArgs8() {
82	x := 0               // ERROR "moved to heap: x"
83	defer func(p *int) { // ERROR "p does not escape" "func literal does not escape"
84		*p = 1
85		// BAD: x should not escape to heap here
86	}(&x) // ERROR "&x escapes to heap"
87}
88
89func ClosureCallArgs9() {
90	// BAD: x should not leak
91	x := 0 // ERROR "moved to heap: x"
92	for {
93		defer func(p *int) { // ERROR "func literal escapes to heap" "p does not escape"
94			*p = 1
95		}(&x) // ERROR "&x escapes to heap"
96	}
97}
98
99func ClosureCallArgs10() {
100	for {
101		x := 0               // ERROR "moved to heap: x"
102		defer func(p *int) { // ERROR "func literal escapes to heap" "p does not escape"
103			*p = 1
104		}(&x) // ERROR "&x escapes to heap"
105	}
106}
107
108func ClosureCallArgs11() {
109	x := 0               // ERROR "moved to heap: x"
110	defer func(p *int) { // ERROR "leaking param: p" "func literal does not escape"
111		sink = p // ERROR "p escapes to heap"
112	}(&x) // ERROR "&x escapes to heap"
113}
114
115func ClosureCallArgs12() {
116	// BAD: x should not leak
117	x := 0                    // ERROR "moved to heap: x"
118	defer func(p *int) *int { // ERROR "leaking param: p to result ~r1" "func literal does not escape"
119		return p
120	}(&x) // ERROR "&x escapes to heap"
121}
122
123func ClosureCallArgs13() {
124	x := 0               // ERROR "moved to heap: x"
125	defer func(p *int) { // ERROR "moved to heap: p" "func literal does not escape"
126		sink = &p // ERROR "&p escapes to heap"
127	}(&x) // ERROR "&x escapes to heap"
128}
129
130func ClosureCallArgs14() {
131	x := 0 // ERROR "moved to heap: x"
132	// BAD: &x should not escape here
133	p := &x                  // ERROR "moved to heap: p" "&x escapes to heap"
134	_ = func(p **int) *int { // ERROR "leaking param: p to result ~r1 level=1" "func literal does not escape"
135		return *p
136		// BAD: p should not escape here
137	}(&p) // ERROR "&p escapes to heap"
138}
139
140func ClosureCallArgs15() {
141	x := 0                      // ERROR "moved to heap: x"
142	p := &x                     // ERROR "moved to heap: p" "&x escapes to heap"
143	sink = func(p **int) *int { // ERROR "leaking param: p to result ~r1 level=1" "func literal does not escape"
144		return *p
145		// BAD: p should not escape here
146	}(&p) // ERROR "&p escapes to heap" "\(func literal\)\(&p\) escapes to heap"
147}
148