1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
// 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 (
"runtime"
"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
}
}
var somethingWrong error
// local closures can be inlined
func l(x, y int) (int, int, error) {
e := func(err error) (int, int, error) { // ERROR "can inline l.func1" "func literal does not escape" "leaking param: err to result"
return 0, 0, err
}
if x == y {
e(somethingWrong) // ERROR "inlining call to l.func1"
}
return y, x, nil
}
// any re-assignment prevents closure inlining
func m() int {
foo := func() int { return 1 } // ERROR "can inline m.func1" "func literal does not escape"
x := foo()
foo = func() int { return 2 } // ERROR "can inline m.func2" "func literal does not escape"
return x + foo()
}
// address taking prevents closure inlining
func n() int {
foo := func() int { return 1 } // ERROR "can inline n.func1" "func literal does not escape"
bar := &foo
x := (*bar)() + foo()
return x
}
// make sure assignment inside closure is detected
func o() int {
foo := func() int { return 1 } // ERROR "can inline o.func1" "func literal does not escape"
func(x int) { // ERROR "func literal does not escape"
if x > 10 {
foo = func() int { return 2 } // ERROR "can inline o.func2" "func literal escapes"
}
}(11)
return foo()
}
func p() int {
return func() int { return 42 }() // ERROR "can inline p.func1" "inlining call to p.func1"
}
func q(x int) int {
foo := func() int { return x * 2 } // ERROR "can inline q.func1" "func literal does not escape"
return foo() // ERROR "inlining call to q.func1"
}
func r(z int) int {
foo := func(x int) int { // ERROR "can inline r.func1" "func literal does not escape"
return x + z
}
bar := func(x int) int { // ERROR "func literal does not escape"
return x + func(y int) int { // ERROR "can inline r.func2.1"
return 2*y + x*z
}(x) // ERROR "inlining call to r.func2.1"
}
return foo(42) + bar(42) // ERROR "inlining call to r.func1"
}
func s0(x int) int {
foo := func() { // ERROR "can inline s0.func1" "func literal does not escape"
x = x + 1
}
foo() // ERROR "inlining call to s0.func1"
return x
}
func s1(x int) int {
foo := func() int { // ERROR "can inline s1.func1" "func literal does not escape"
return x
}
x = x + 1
return foo() // ERROR "inlining call to s1.func1"
}
// 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 "x does not escape"
switch x.(type) {
case int:
return x.(int)
default:
return 0
}
}
type T struct{}
func (T) meth(int, int) {} // ERROR "can inline T.meth"
func k() (T, int, int) { return T{}, 0, 0 } // ERROR "can inline k"
func _() { // ERROR "can inline _"
T.meth(k()) // ERROR "inlining call to k" "inlining call to T.meth"
}
func small1() { // ERROR "can inline small1"
runtime.GC()
}
func small2() int { // ERROR "can inline small2"
return runtime.GOMAXPROCS(0)
}
func small3(t T) { // ERROR "can inline small3"
t.meth2(3, 5)
}
func small4(t T) { // not inlineable - has 2 calls.
t.meth2(runtime.GOMAXPROCS(0), 5)
}
func (T) meth2(int, int) { // not inlineable - has 2 calls.
runtime.GC()
runtime.GC()
}
// Issue #29737 - make sure we can do inlining for a chain of recursive functions
func ee() { // ERROR "can inline ee"
ff(100) // ERROR "inlining call to ff" "inlining call to gg" "inlining call to hh"
}
func ff(x int) { // ERROR "can inline ff"
if x < 0 {
return
}
gg(x - 1)
}
func gg(x int) { // ERROR "can inline gg"
hh(x - 1)
}
func hh(x int) { // ERROR "can inline hh"
ff(x - 1) // ERROR "inlining call to ff" // ERROR "inlining call to gg"
}
|
