blob: d1e409ef95718da4b04cf3041e6f32ff3cc98e5d (
plain)
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
|
// Copyright 2020 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.
package intern
import (
"fmt"
"runtime"
"testing"
)
func TestBasics(t *testing.T) {
clearMap()
foo := Get("foo")
bar := Get("bar")
empty := Get("")
nilEface := Get(nil)
i := Get(0x7777777)
foo2 := Get("foo")
bar2 := Get("bar")
empty2 := Get("")
nilEface2 := Get(nil)
i2 := Get(0x7777777)
foo3 := GetByString("foo")
empty3 := GetByString("")
if foo.Get() != foo2.Get() {
t.Error("foo/foo2 values differ")
}
if foo.Get() != foo3.Get() {
t.Error("foo/foo3 values differ")
}
if foo.Get() != "foo" {
t.Error("foo.Get not foo")
}
if foo != foo2 {
t.Error("foo/foo2 pointers differ")
}
if foo != foo3 {
t.Error("foo/foo3 pointers differ")
}
if bar.Get() != bar2.Get() {
t.Error("bar values differ")
}
if bar.Get() != "bar" {
t.Error("bar.Get not bar")
}
if bar != bar2 {
t.Error("bar pointers differ")
}
if i.Get() != i.Get() {
t.Error("i values differ")
}
if i.Get() != 0x7777777 {
t.Error("i.Get not 0x7777777")
}
if i != i2 {
t.Error("i pointers differ")
}
if empty.Get() != empty2.Get() {
t.Error("empty/empty2 values differ")
}
if empty.Get() != empty.Get() {
t.Error("empty/empty3 values differ")
}
if empty.Get() != "" {
t.Error("empty.Get not empty string")
}
if empty != empty2 {
t.Error("empty/empty2 pointers differ")
}
if empty != empty3 {
t.Error("empty/empty3 pointers differ")
}
if nilEface.Get() != nilEface2.Get() {
t.Error("nilEface values differ")
}
if nilEface.Get() != nil {
t.Error("nilEface.Get not nil")
}
if nilEface != nilEface2 {
t.Error("nilEface pointers differ")
}
if n := mapLen(); n != 5 {
t.Errorf("map len = %d; want 4", n)
}
wantEmpty(t)
}
func wantEmpty(t testing.TB) {
t.Helper()
const gcTries = 5000
for try := 0; try < gcTries; try++ {
runtime.GC()
n := mapLen()
if n == 0 {
break
}
if try == gcTries-1 {
t.Errorf("map len = %d after (%d GC tries); want 0, contents: %v", n, gcTries, mapKeys())
}
}
}
func TestStress(t *testing.T) {
iters := 10000
if testing.Short() {
iters = 1000
}
var sink []byte
for i := 0; i < iters; i++ {
_ = Get("foo")
sink = make([]byte, 1<<20)
}
_ = sink
}
func BenchmarkStress(b *testing.B) {
done := make(chan struct{})
defer close(done)
go func() {
for {
select {
case <-done:
return
default:
}
runtime.GC()
}
}()
clearMap()
v1 := Get("foo")
b.ReportAllocs()
b.RunParallel(func(pb *testing.PB) {
for pb.Next() {
v2 := Get("foo")
if v1 != v2 {
b.Fatal("wrong value")
}
// And also a key we don't retain:
_ = Get("bar")
}
})
runtime.GC()
wantEmpty(b)
}
func mapLen() int {
mu.Lock()
defer mu.Unlock()
return len(valMap)
}
func mapKeys() (keys []string) {
mu.Lock()
defer mu.Unlock()
for k := range valMap {
keys = append(keys, fmt.Sprint(k))
}
return keys
}
func clearMap() {
mu.Lock()
defer mu.Unlock()
for k := range valMap {
delete(valMap, k)
}
}
var (
globalString = "not a constant"
sink string
)
func TestGetByStringAllocs(t *testing.T) {
allocs := int(testing.AllocsPerRun(100, func() {
GetByString(globalString)
}))
if allocs != 0 {
t.Errorf("GetString allocated %d objects, want 0", allocs)
}
}
func BenchmarkGetByString(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
v := GetByString(globalString)
sink = v.Get().(string)
}
}
|
