627 lines
22 KiB
Go
627 lines
22 KiB
Go
// Copyright 2018 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// The dexpreopt package converts a global dexpreopt config and a module dexpreopt config into rules to perform
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// dexpreopting and to strip the dex files from the APK or JAR.
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//
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// It is used in two places; in the dexpeopt_gen binary for modules defined in Make, and directly linked into Soong.
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//
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// For Make modules it is built into the dexpreopt_gen binary, which is executed as a Make rule using global config and
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// module config specified in JSON files. The binary writes out two shell scripts, only updating them if they have
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// changed. One script takes an APK or JAR as an input and produces a zip file containing any outputs of preopting,
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// in the location they should be on the device. The Make build rules will unzip the zip file into $(PRODUCT_OUT) when
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// installing the APK, which will install the preopt outputs into $(PRODUCT_OUT)/system or $(PRODUCT_OUT)/system_other
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// as necessary. The zip file may be empty if preopting was disabled for any reason. The second script takes an APK or
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// JAR as an input and strips the dex files in it as necessary.
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//
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// The intermediate shell scripts allow changes to this package or to the global config to regenerate the shell scripts
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// but only require re-executing preopting if the script has changed.
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//
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// For Soong modules this package is linked directly into Soong and run from the java package. It generates the same
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// commands as for make, using athe same global config JSON file used by make, but using a module config structure
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// provided by Soong. The generated commands are then converted into Soong rule and written directly to the ninja file,
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// with no extra shell scripts involved.
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package dexpreopt
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import (
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"fmt"
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"path/filepath"
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"runtime"
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"strings"
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"android/soong/android"
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"github.com/google/blueprint/pathtools"
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)
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const SystemPartition = "/system/"
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const SystemOtherPartition = "/system_other/"
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// GenerateStripRule generates a set of commands that will take an APK or JAR as an input and strip the dex files if
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// they are no longer necessary after preopting.
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func GenerateStripRule(global GlobalConfig, module ModuleConfig) (rule *android.RuleBuilder, err error) {
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defer func() {
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if r := recover(); r != nil {
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if _, ok := r.(runtime.Error); ok {
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panic(r)
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} else if e, ok := r.(error); ok {
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err = e
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rule = nil
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} else {
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panic(r)
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}
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}
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}()
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tools := global.Tools
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rule = android.NewRuleBuilder()
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strip := shouldStripDex(module, global)
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if strip {
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if global.NeverAllowStripping {
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panic(fmt.Errorf("Stripping requested on %q, though the product does not allow it", module.DexLocation))
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}
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// Only strips if the dex files are not already uncompressed
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rule.Command().
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Textf(`if (zipinfo %s '*.dex' 2>/dev/null | grep -v ' stor ' >/dev/null) ; then`, module.StripInputPath).
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Tool(tools.Zip2zip).FlagWithInput("-i ", module.StripInputPath).FlagWithOutput("-o ", module.StripOutputPath).
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FlagWithArg("-x ", `"classes*.dex"`).
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Textf(`; else cp -f %s %s; fi`, module.StripInputPath, module.StripOutputPath)
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} else {
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rule.Command().Text("cp -f").Input(module.StripInputPath).Output(module.StripOutputPath)
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}
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return rule, nil
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}
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// GenerateDexpreoptRule generates a set of commands that will preopt a module based on a GlobalConfig and a
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// ModuleConfig. The produced files and their install locations will be available through rule.Installs().
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func GenerateDexpreoptRule(ctx android.PathContext,
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global GlobalConfig, module ModuleConfig) (rule *android.RuleBuilder, err error) {
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defer func() {
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if r := recover(); r != nil {
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if _, ok := r.(runtime.Error); ok {
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panic(r)
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} else if e, ok := r.(error); ok {
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err = e
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rule = nil
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} else {
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panic(r)
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}
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}
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}()
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rule = android.NewRuleBuilder()
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generateProfile := module.ProfileClassListing.Valid() && !global.DisableGenerateProfile
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var profile android.WritablePath
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if generateProfile {
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profile = profileCommand(ctx, global, module, rule)
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}
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if !dexpreoptDisabled(global, module) {
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// Don't preopt individual boot jars, they will be preopted together.
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// This check is outside dexpreoptDisabled because they still need to be stripped.
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if !contains(global.BootJars, module.Name) {
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appImage := (generateProfile || module.ForceCreateAppImage || global.DefaultAppImages) &&
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!module.NoCreateAppImage
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generateDM := shouldGenerateDM(module, global)
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for i, arch := range module.Archs {
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image := module.DexPreoptImages[i]
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imageDeps := module.DexPreoptImagesDeps[i]
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dexpreoptCommand(ctx, global, module, rule, arch, profile, image, imageDeps, appImage, generateDM)
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}
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}
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}
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return rule, nil
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}
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func dexpreoptDisabled(global GlobalConfig, module ModuleConfig) bool {
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if contains(global.DisablePreoptModules, module.Name) {
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return true
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}
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// If OnlyPreoptBootImageAndSystemServer=true and module is not in boot class path skip
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// Also preopt system server jars since selinux prevents system server from loading anything from
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// /data. If we don't do this they will need to be extracted which is not favorable for RAM usage
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// or performance. If PreoptExtractedApk is true, we ignore the only preopt boot image options.
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if global.OnlyPreoptBootImageAndSystemServer && !contains(global.BootJars, module.Name) &&
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!contains(global.SystemServerJars, module.Name) && !module.PreoptExtractedApk {
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return true
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}
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return false
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}
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func profileCommand(ctx android.PathContext, global GlobalConfig, module ModuleConfig,
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rule *android.RuleBuilder) android.WritablePath {
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profilePath := module.BuildPath.InSameDir(ctx, "profile.prof")
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profileInstalledPath := module.DexLocation + ".prof"
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if !module.ProfileIsTextListing {
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rule.Command().FlagWithOutput("touch ", profilePath)
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}
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cmd := rule.Command().
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Text(`ANDROID_LOG_TAGS="*:e"`).
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Tool(global.Tools.Profman)
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if module.ProfileIsTextListing {
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// The profile is a test listing of classes (used for framework jars).
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// We need to generate the actual binary profile before being able to compile.
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cmd.FlagWithInput("--create-profile-from=", module.ProfileClassListing.Path())
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} else {
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// The profile is binary profile (used for apps). Run it through profman to
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// ensure the profile keys match the apk.
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cmd.
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Flag("--copy-and-update-profile-key").
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FlagWithInput("--profile-file=", module.ProfileClassListing.Path())
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}
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cmd.
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FlagWithInput("--apk=", module.DexPath).
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Flag("--dex-location="+module.DexLocation).
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FlagWithOutput("--reference-profile-file=", profilePath)
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if !module.ProfileIsTextListing {
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cmd.Text(fmt.Sprintf(`|| echo "Profile out of date for %s"`, module.DexPath))
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}
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rule.Install(profilePath, profileInstalledPath)
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return profilePath
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}
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func dexpreoptCommand(ctx android.PathContext, global GlobalConfig, module ModuleConfig, rule *android.RuleBuilder,
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arch android.ArchType, profile, bootImage android.Path, bootImageDeps android.Paths, appImage, generateDM bool) {
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// HACK: make soname in Soong-generated .odex files match Make.
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base := filepath.Base(module.DexLocation)
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if filepath.Ext(base) == ".jar" {
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base = "javalib.jar"
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} else if filepath.Ext(base) == ".apk" {
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base = "package.apk"
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}
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toOdexPath := func(path string) string {
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return filepath.Join(
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filepath.Dir(path),
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"oat",
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arch.String(),
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pathtools.ReplaceExtension(filepath.Base(path), "odex"))
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}
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odexPath := module.BuildPath.InSameDir(ctx, "oat", arch.String(), pathtools.ReplaceExtension(base, "odex"))
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odexInstallPath := toOdexPath(module.DexLocation)
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if odexOnSystemOther(module, global) {
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odexInstallPath = strings.Replace(odexInstallPath, SystemPartition, SystemOtherPartition, 1)
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}
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vdexPath := odexPath.ReplaceExtension(ctx, "vdex")
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vdexInstallPath := pathtools.ReplaceExtension(odexInstallPath, "vdex")
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invocationPath := odexPath.ReplaceExtension(ctx, "invocation")
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// bootImage is .../dex_bootjars/system/framework/arm64/boot.art, but dex2oat wants
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// .../dex_bootjars/system/framework/boot.art on the command line
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var bootImageLocation string
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if bootImage != nil {
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bootImageLocation = PathToLocation(bootImage, arch)
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}
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// The class loader context using paths in the build
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var classLoaderContextHost android.Paths
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// The class loader context using paths as they will be on the device
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var classLoaderContextTarget []string
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// Extra paths that will be appended to the class loader if the APK manifest has targetSdkVersion < 28
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var conditionalClassLoaderContextHost28 android.Paths
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var conditionalClassLoaderContextTarget28 []string
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// Extra paths that will be appended to the class loader if the APK manifest has targetSdkVersion < 29
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var conditionalClassLoaderContextHost29 android.Paths
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var conditionalClassLoaderContextTarget29 []string
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var classLoaderContextHostString string
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if module.EnforceUsesLibraries {
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usesLibs := append(copyOf(module.UsesLibraries), module.PresentOptionalUsesLibraries...)
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// Create class loader context for dex2oat from uses libraries and filtered optional libraries
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for _, l := range usesLibs {
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classLoaderContextHost = append(classLoaderContextHost,
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pathForLibrary(module, l))
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classLoaderContextTarget = append(classLoaderContextTarget,
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filepath.Join("/system/framework", l+".jar"))
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}
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const httpLegacy = "org.apache.http.legacy"
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const httpLegacyImpl = "org.apache.http.legacy.impl"
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// org.apache.http.legacy contains classes that were in the default classpath until API 28. If the
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// targetSdkVersion in the manifest or APK is < 28, and the module does not explicitly depend on
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// org.apache.http.legacy, then implicitly add the classes to the classpath for dexpreopt. One the
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// device the classes will be in a file called org.apache.http.legacy.impl.jar.
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module.LibraryPaths[httpLegacyImpl] = module.LibraryPaths[httpLegacy]
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if !contains(module.UsesLibraries, httpLegacy) && !contains(module.PresentOptionalUsesLibraries, httpLegacy) {
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conditionalClassLoaderContextHost28 = append(conditionalClassLoaderContextHost28,
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pathForLibrary(module, httpLegacyImpl))
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conditionalClassLoaderContextTarget28 = append(conditionalClassLoaderContextTarget28,
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filepath.Join("/system/framework", httpLegacyImpl+".jar"))
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}
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const hidlBase = "android.hidl.base-V1.0-java"
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const hidlManager = "android.hidl.manager-V1.0-java"
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// android.hidl.base-V1.0-java and android.hidl.manager-V1.0 contain classes that were in the default
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// classpath until API 29. If the targetSdkVersion in the manifest or APK is < 29 then implicitly add
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// the classes to the classpath for dexpreopt.
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conditionalClassLoaderContextHost29 = append(conditionalClassLoaderContextHost29,
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pathForLibrary(module, hidlManager))
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conditionalClassLoaderContextTarget29 = append(conditionalClassLoaderContextTarget29,
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filepath.Join("/system/framework", hidlManager+".jar"))
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conditionalClassLoaderContextHost29 = append(conditionalClassLoaderContextHost29,
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pathForLibrary(module, hidlBase))
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conditionalClassLoaderContextTarget29 = append(conditionalClassLoaderContextTarget29,
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filepath.Join("/system/framework", hidlBase+".jar"))
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classLoaderContextHostString = strings.Join(classLoaderContextHost.Strings(), ":")
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} else {
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// Pass special class loader context to skip the classpath and collision check.
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// This will get removed once LOCAL_USES_LIBRARIES is enforced.
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// Right now LOCAL_USES_LIBRARIES is opt in, for the case where it's not specified we still default
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// to the &.
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classLoaderContextHostString = `\&`
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}
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rule.Command().FlagWithArg("mkdir -p ", filepath.Dir(odexPath.String()))
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rule.Command().FlagWithOutput("rm -f ", odexPath)
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// Set values in the environment of the rule. These may be modified by construct_context.sh.
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rule.Command().FlagWithArg("class_loader_context_arg=--class-loader-context=", classLoaderContextHostString)
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rule.Command().Text(`stored_class_loader_context_arg=""`)
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if module.EnforceUsesLibraries {
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if module.ManifestPath != nil {
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rule.Command().Text(`target_sdk_version="$(`).
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Tool(global.Tools.ManifestCheck).
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Flag("--extract-target-sdk-version").
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Input(module.ManifestPath).
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Text(`)"`)
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} else {
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// No manifest to extract targetSdkVersion from, hope that DexJar is an APK
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rule.Command().Text(`target_sdk_version="$(`).
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Tool(global.Tools.Aapt).
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Flag("dump badging").
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Input(module.DexPath).
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Text(`| grep "targetSdkVersion" | sed -n "s/targetSdkVersion:'\(.*\)'/\1/p"`).
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Text(`)"`)
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}
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rule.Command().Textf(`dex_preopt_host_libraries="%s"`,
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strings.Join(classLoaderContextHost.Strings(), " ")).
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Implicits(classLoaderContextHost)
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rule.Command().Textf(`dex_preopt_target_libraries="%s"`,
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strings.Join(classLoaderContextTarget, " "))
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rule.Command().Textf(`conditional_host_libs_28="%s"`,
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strings.Join(conditionalClassLoaderContextHost28.Strings(), " ")).
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Implicits(conditionalClassLoaderContextHost28)
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rule.Command().Textf(`conditional_target_libs_28="%s"`,
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strings.Join(conditionalClassLoaderContextTarget28, " "))
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rule.Command().Textf(`conditional_host_libs_29="%s"`,
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strings.Join(conditionalClassLoaderContextHost29.Strings(), " ")).
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Implicits(conditionalClassLoaderContextHost29)
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rule.Command().Textf(`conditional_target_libs_29="%s"`,
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strings.Join(conditionalClassLoaderContextTarget29, " "))
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rule.Command().Text("source").Tool(global.Tools.ConstructContext).Input(module.DexPath)
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}
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// Devices that do not have a product partition use a symlink from /product to /system/product.
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// Because on-device dexopt will see dex locations starting with /product, we change the paths
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// to mimic this behavior.
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dexLocationArg := module.DexLocation
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if strings.HasPrefix(dexLocationArg, "/system/product/") {
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dexLocationArg = strings.TrimPrefix(dexLocationArg, "/system")
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}
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cmd := rule.Command().
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Text(`ANDROID_LOG_TAGS="*:e"`).
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Tool(global.Tools.Dex2oat).
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Flag("--avoid-storing-invocation").
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FlagWithOutput("--write-invocation-to=", invocationPath).ImplicitOutput(invocationPath).
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Flag("--runtime-arg").FlagWithArg("-Xms", global.Dex2oatXms).
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Flag("--runtime-arg").FlagWithArg("-Xmx", global.Dex2oatXmx).
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Flag("--runtime-arg").FlagWithInputList("-Xbootclasspath:", module.PreoptBootClassPathDexFiles, ":").
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Flag("--runtime-arg").FlagWithList("-Xbootclasspath-locations:", module.PreoptBootClassPathDexLocations, ":").
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Flag("${class_loader_context_arg}").
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Flag("${stored_class_loader_context_arg}").
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FlagWithArg("--boot-image=", bootImageLocation).Implicits(bootImageDeps).
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FlagWithInput("--dex-file=", module.DexPath).
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FlagWithArg("--dex-location=", dexLocationArg).
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FlagWithOutput("--oat-file=", odexPath).ImplicitOutput(vdexPath).
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// Pass an empty directory, dex2oat shouldn't be reading arbitrary files
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FlagWithArg("--android-root=", global.EmptyDirectory).
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FlagWithArg("--instruction-set=", arch.String()).
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FlagWithArg("--instruction-set-variant=", global.CpuVariant[arch]).
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FlagWithArg("--instruction-set-features=", global.InstructionSetFeatures[arch]).
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Flag("--no-generate-debug-info").
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Flag("--generate-build-id").
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Flag("--abort-on-hard-verifier-error").
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Flag("--force-determinism").
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FlagWithArg("--no-inline-from=", "core-oj.jar")
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var preoptFlags []string
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if len(module.PreoptFlags) > 0 {
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preoptFlags = module.PreoptFlags
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} else if len(global.PreoptFlags) > 0 {
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preoptFlags = global.PreoptFlags
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}
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if len(preoptFlags) > 0 {
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cmd.Text(strings.Join(preoptFlags, " "))
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}
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if module.UncompressedDex {
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cmd.FlagWithArg("--copy-dex-files=", "false")
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}
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if !anyHavePrefix(preoptFlags, "--compiler-filter=") {
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var compilerFilter string
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if contains(global.SystemServerJars, module.Name) {
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// Jars of system server, use the product option if it is set, speed otherwise.
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if global.SystemServerCompilerFilter != "" {
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compilerFilter = global.SystemServerCompilerFilter
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} else {
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compilerFilter = "speed"
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}
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} else if contains(global.SpeedApps, module.Name) || contains(global.SystemServerApps, module.Name) {
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// Apps loaded into system server, and apps the product default to being compiled with the
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// 'speed' compiler filter.
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compilerFilter = "speed"
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} else if profile != nil {
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// For non system server jars, use speed-profile when we have a profile.
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compilerFilter = "speed-profile"
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} else if global.DefaultCompilerFilter != "" {
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compilerFilter = global.DefaultCompilerFilter
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} else {
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compilerFilter = "quicken"
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}
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cmd.FlagWithArg("--compiler-filter=", compilerFilter)
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}
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if generateDM {
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cmd.FlagWithArg("--copy-dex-files=", "false")
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dmPath := module.BuildPath.InSameDir(ctx, "generated.dm")
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dmInstalledPath := pathtools.ReplaceExtension(module.DexLocation, "dm")
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tmpPath := module.BuildPath.InSameDir(ctx, "primary.vdex")
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rule.Command().Text("cp -f").Input(vdexPath).Output(tmpPath)
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rule.Command().Tool(global.Tools.SoongZip).
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FlagWithArg("-L", "9").
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FlagWithOutput("-o", dmPath).
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Flag("-j").
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Input(tmpPath)
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rule.Install(dmPath, dmInstalledPath)
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}
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// By default, emit debug info.
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debugInfo := true
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if global.NoDebugInfo {
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// If the global setting suppresses mini-debug-info, disable it.
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debugInfo = false
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}
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// PRODUCT_SYSTEM_SERVER_DEBUG_INFO overrides WITH_DEXPREOPT_DEBUG_INFO.
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// PRODUCT_OTHER_JAVA_DEBUG_INFO overrides WITH_DEXPREOPT_DEBUG_INFO.
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if contains(global.SystemServerJars, module.Name) {
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if global.AlwaysSystemServerDebugInfo {
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debugInfo = true
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} else if global.NeverSystemServerDebugInfo {
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debugInfo = false
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}
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} else {
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if global.AlwaysOtherDebugInfo {
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debugInfo = true
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} else if global.NeverOtherDebugInfo {
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debugInfo = false
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}
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}
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|
|
|
// Never enable on eng.
|
|
if global.IsEng {
|
|
debugInfo = false
|
|
}
|
|
|
|
if debugInfo {
|
|
cmd.Flag("--generate-mini-debug-info")
|
|
} else {
|
|
cmd.Flag("--no-generate-mini-debug-info")
|
|
}
|
|
|
|
// Set the compiler reason to 'prebuilt' to identify the oat files produced
|
|
// during the build, as opposed to compiled on the device.
|
|
cmd.FlagWithArg("--compilation-reason=", "prebuilt")
|
|
|
|
if appImage {
|
|
appImagePath := odexPath.ReplaceExtension(ctx, "art")
|
|
appImageInstallPath := pathtools.ReplaceExtension(odexInstallPath, "art")
|
|
cmd.FlagWithOutput("--app-image-file=", appImagePath).
|
|
FlagWithArg("--image-format=", "lz4")
|
|
if !global.DontResolveStartupStrings {
|
|
cmd.FlagWithArg("--resolve-startup-const-strings=", "true")
|
|
}
|
|
rule.Install(appImagePath, appImageInstallPath)
|
|
}
|
|
|
|
if profile != nil {
|
|
cmd.FlagWithInput("--profile-file=", profile)
|
|
}
|
|
|
|
rule.Install(odexPath, odexInstallPath)
|
|
rule.Install(vdexPath, vdexInstallPath)
|
|
}
|
|
|
|
// Return if the dex file in the APK should be stripped. If an APK is found to contain uncompressed dex files at
|
|
// dex2oat time it will not be stripped even if strip=true.
|
|
func shouldStripDex(module ModuleConfig, global GlobalConfig) bool {
|
|
strip := !global.DefaultNoStripping
|
|
|
|
if dexpreoptDisabled(global, module) {
|
|
strip = false
|
|
}
|
|
|
|
if module.NoStripping {
|
|
strip = false
|
|
}
|
|
|
|
// Don't strip modules that are not on the system partition in case the oat/vdex version in system ROM
|
|
// doesn't match the one in other partitions. It needs to be able to fall back to the APK for that case.
|
|
if !strings.HasPrefix(module.DexLocation, SystemPartition) {
|
|
strip = false
|
|
}
|
|
|
|
// system_other isn't there for an OTA, so don't strip if module is on system, and odex is on system_other.
|
|
if odexOnSystemOther(module, global) {
|
|
strip = false
|
|
}
|
|
|
|
if module.HasApkLibraries {
|
|
strip = false
|
|
}
|
|
|
|
// Don't strip with dex files we explicitly uncompress (dexopt will not store the dex code).
|
|
if module.UncompressedDex {
|
|
strip = false
|
|
}
|
|
|
|
if shouldGenerateDM(module, global) {
|
|
strip = false
|
|
}
|
|
|
|
if module.PresignedPrebuilt {
|
|
// Only strip out files if we can re-sign the package.
|
|
strip = false
|
|
}
|
|
|
|
return strip
|
|
}
|
|
|
|
func shouldGenerateDM(module ModuleConfig, global GlobalConfig) bool {
|
|
// Generating DM files only makes sense for verify, avoid doing for non verify compiler filter APKs.
|
|
// No reason to use a dm file if the dex is already uncompressed.
|
|
return global.GenerateDMFiles && !module.UncompressedDex &&
|
|
contains(module.PreoptFlags, "--compiler-filter=verify")
|
|
}
|
|
|
|
func OdexOnSystemOtherByName(name string, dexLocation string, global GlobalConfig) bool {
|
|
if !global.HasSystemOther {
|
|
return false
|
|
}
|
|
|
|
if global.SanitizeLite {
|
|
return false
|
|
}
|
|
|
|
if contains(global.SpeedApps, name) || contains(global.SystemServerApps, name) {
|
|
return false
|
|
}
|
|
|
|
for _, f := range global.PatternsOnSystemOther {
|
|
if makefileMatch(filepath.Join(SystemPartition, f), dexLocation) {
|
|
return true
|
|
}
|
|
}
|
|
|
|
return false
|
|
}
|
|
|
|
func odexOnSystemOther(module ModuleConfig, global GlobalConfig) bool {
|
|
return OdexOnSystemOtherByName(module.Name, module.DexLocation, global)
|
|
}
|
|
|
|
// PathToLocation converts .../system/framework/arm64/boot.art to .../system/framework/boot.art
|
|
func PathToLocation(path android.Path, arch android.ArchType) string {
|
|
pathArch := filepath.Base(filepath.Dir(path.String()))
|
|
if pathArch != arch.String() {
|
|
panic(fmt.Errorf("last directory in %q must be %q", path, arch.String()))
|
|
}
|
|
return filepath.Join(filepath.Dir(filepath.Dir(path.String())), filepath.Base(path.String()))
|
|
}
|
|
|
|
func pathForLibrary(module ModuleConfig, lib string) android.Path {
|
|
path, ok := module.LibraryPaths[lib]
|
|
if !ok {
|
|
panic(fmt.Errorf("unknown library path for %q", lib))
|
|
}
|
|
return path
|
|
}
|
|
|
|
func makefileMatch(pattern, s string) bool {
|
|
percent := strings.IndexByte(pattern, '%')
|
|
switch percent {
|
|
case -1:
|
|
return pattern == s
|
|
case len(pattern) - 1:
|
|
return strings.HasPrefix(s, pattern[:len(pattern)-1])
|
|
default:
|
|
panic(fmt.Errorf("unsupported makefile pattern %q", pattern))
|
|
}
|
|
}
|
|
|
|
func contains(l []string, s string) bool {
|
|
for _, e := range l {
|
|
if e == s {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
// remove all elements in a from b, returning a new slice
|
|
func filterOut(a []string, b []string) []string {
|
|
var ret []string
|
|
for _, x := range b {
|
|
if !contains(a, x) {
|
|
ret = append(ret, x)
|
|
}
|
|
}
|
|
return ret
|
|
}
|
|
|
|
func replace(l []string, from, to string) {
|
|
for i := range l {
|
|
if l[i] == from {
|
|
l[i] = to
|
|
}
|
|
}
|
|
}
|
|
|
|
var copyOf = android.CopyOf
|
|
|
|
func anyHavePrefix(l []string, prefix string) bool {
|
|
for _, x := range l {
|
|
if strings.HasPrefix(x, prefix) {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|