зеркало из https://github.com/golang/tools.git
Revert "internal/aliases: add a function to conditionally enable aliases"
This reverts commit f8f3c13ff3.
Reason for revert: https://go.dev/cl/619395 appears to be a better solution for the same problem.
Change-Id: Ie3f290fca74b2cc2627484504b6db780f89b3bb4
Reviewed-on: https://go-review.googlesource.com/c/tools/+/619415
Reviewed-by: Robert Findley <rfindley@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Commit-Queue: Tim King <taking@google.com>
This commit is contained in:
Tim King
Go LUCI
Родитель
4f6e118e23
Коммит
50179f2225
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@ -5,13 +5,8 @@
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package aliases
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package aliases
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import (
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import (
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"go/build"
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"go/token"
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"go/token"
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"go/types"
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"go/types"
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"os"
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"slices"
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"strings"
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"sync"
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)
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)
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// Package aliases defines backward compatible shims
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// Package aliases defines backward compatible shims
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@ -41,52 +36,3 @@ func NewAlias(enabled bool, pos token.Pos, pkg *types.Package, name string, rhs
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}
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}
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return types.NewTypeName(pos, pkg, name, rhs)
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return types.NewTypeName(pos, pkg, name, rhs)
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}
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}
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// ConditionallyEnableGoTypesAlias enables the gotypesalias GODEBUG setting if
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// * the version of go used to compile the program is between 1.23 and 1.26,
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// * gotypesalias are not already enabled, and
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// * gotypesalias is not set in GODEBUG already
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// exactly once. Otherwise it does nothing.
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//
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// Recommended usage is to do the following within a main package:
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//
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// func init() { ConditionallyEnableGoTypesAlias() }
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//
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// within a module with go version 1.22 or in GOPATH mode.
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func ConditionallyEnableGoTypesAlias() { conditionallyEnableGoTypesAliasOnce() }
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var conditionallyEnableGoTypesAliasOnce = sync.OnceFunc(conditionallyEnableGoTypesAlias)
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func conditionallyEnableGoTypesAlias() {
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// Let R be the version of go the program was compiled with. Then
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// if R < 1.22, do nothing as gotypesalias is meaningless,
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// if R == 1.22, do not turn on gotypesalias (latent bugs),
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// if 1.23 <= R && R <= 1.26, turn on gotypesalias, and
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// if R >= 1.27, this is a guaranteed no-op.
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if !slices.Contains(build.Default.ReleaseTags, "go1.23") {
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return // R < 1.23 (do nothing)
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}
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if slices.Contains(build.Default.ReleaseTags, "go1.27") {
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return // R >= 1.27 (do nothing)
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}
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// 1.23 <= R <= 1.26
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_, anyIsAlias := types.Universe.Lookup("any").Type().(*types.Alias)
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if anyIsAlias {
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return // gotypesalias are already enabled.
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}
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// Does GODEBUG have gotypesalias set already?
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godebugs := strings.Split(os.Getenv("GODEBUG"), ",")
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for _, p := range godebugs {
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if strings.HasPrefix(strings.TrimSpace(p), "gotypesalias=") {
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// gotypesalias is set in GODEBUG already.
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// Do not override this setting.
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return
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}
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}
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// Enable gotypesalias.
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godebugs = append(godebugs, "gotypesalias=1")
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os.Setenv("GODEBUG", strings.Join(godebugs, ","))
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}
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@ -1,76 +0,0 @@
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// Copyright 2024 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 aliases_test
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import (
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"fmt"
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"os"
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"os/exec"
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"runtime"
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"strings"
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"testing"
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"golang.org/x/tools/internal/aliases"
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"golang.org/x/tools/internal/testenv"
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)
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func init() {
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if os.Getenv("ConditionallyEnableGoTypesAlias_CHILD") == "1" {
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go aliases.ConditionallyEnableGoTypesAlias() // Throw in an extra call. Should be fine.
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aliases.ConditionallyEnableGoTypesAlias()
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}
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}
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func TestConditionallyEnableGoTypesAlias(t *testing.T) {
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if !(runtime.GOOS == "linux" || runtime.GOOS == "darwin") {
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t.Skipf("skipping fork/exec test on this platform")
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}
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if os.Getenv("ConditionallyEnableGoTypesAlias_CHILD") == "1" {
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// child process
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enabled := aliases.Enabled()
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fmt.Printf("gotypesalias is enabled %v", enabled)
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return
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}
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testenv.NeedsTool(t, "go")
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var wants map[string]string
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const (
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enabled = "gotypesalias is enabled true"
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disabled = "gotypesalias is enabled false"
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)
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goversion := testenv.Go1Point()
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if goversion <= 22 {
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wants = map[string]string{
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"": disabled,
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"0": disabled,
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"1": enabled,
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}
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} else {
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wants = map[string]string{
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"": enabled,
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"0": disabled,
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"1": enabled,
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}
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}
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for _, test := range []string{"", "0", "1"} {
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cmd := exec.Command(os.Args[0], "-test.run=TestConditionallyEnableGoTypesAlias")
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cmd.Env = append(os.Environ(), "ConditionallyEnableGoTypesAlias_CHILD=1")
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if test != "" {
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cmd.Env = append(cmd.Env, fmt.Sprintf("GODEBUG=gotypesalias=%s", test))
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}
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out, err := cmd.CombinedOutput()
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if err != nil {
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t.Error(err)
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}
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want := wants[test]
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if !strings.Contains(string(out), want) {
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t.Errorf("gotypesalias=%q: want %s", test, want)
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t.Logf("(go 1.%d) %q: out=<<%s>>", goversion, test, out)
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}
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}
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}
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