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
|
// Copyright 2022 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 types_test
import (
"go/importer"
"go/token"
"path/filepath"
"runtime"
"testing"
. "go/types"
)
// BenchmarkLookupFieldOrMethod measures types.LookupFieldOrMethod performance.
// LookupFieldOrMethod is a performance hotspot for both type-checking and
// external API calls.
func BenchmarkLookupFieldOrMethod(b *testing.B) {
// Choose an arbitrary, large package.
path := filepath.Join(runtime.GOROOT(), "src", "net", "http")
fset := token.NewFileSet()
files, err := pkgFiles(fset, path)
if err != nil {
b.Fatal(err)
}
conf := Config{
Importer: importer.Default(),
}
pkg, err := conf.Check("http", fset, files, nil)
if err != nil {
b.Fatal(err)
}
scope := pkg.Scope()
names := scope.Names()
// Look up an arbitrary name for each type referenced in the package scope.
lookup := func() {
for _, name := range names {
typ := scope.Lookup(name).Type()
LookupFieldOrMethod(typ, true, pkg, "m")
}
}
// Perform a lookup once, to ensure that any lazily-evaluated state is
// complete.
lookup()
b.ResetTimer()
for i := 0; i < b.N; i++ {
lookup()
}
}
|
