mirror of https://go.googlesource.com/go
59 lines
1.2 KiB
Go
59 lines
1.2 KiB
Go
// Copyright 2022 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package types_test
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import (
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"go/importer"
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"go/token"
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"path/filepath"
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"runtime"
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"testing"
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. "go/types"
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)
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// BenchmarkLookupFieldOrMethod measures types.LookupFieldOrMethod performance.
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// LookupFieldOrMethod is a performance hotspot for both type-checking and
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// external API calls.
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func BenchmarkLookupFieldOrMethod(b *testing.B) {
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// Choose an arbitrary, large package.
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path := filepath.Join(runtime.GOROOT(), "src", "net", "http")
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fset := token.NewFileSet()
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files, err := pkgFiles(fset, path)
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if err != nil {
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b.Fatal(err)
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}
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conf := Config{
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Importer: importer.Default(),
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}
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pkg, err := conf.Check("http", fset, files, nil)
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if err != nil {
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b.Fatal(err)
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}
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scope := pkg.Scope()
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names := scope.Names()
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// Look up an arbitrary name for each type referenced in the package scope.
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lookup := func() {
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for _, name := range names {
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typ := scope.Lookup(name).Type()
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LookupFieldOrMethod(typ, true, pkg, "m")
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}
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}
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// Perform a lookup once, to ensure that any lazily-evaluated state is
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// complete.
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lookup()
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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lookup()
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}
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}
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