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// Copyright 2021 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cc
import (
"fmt"
"strings"
"github.com/google/blueprint/proptools"
"android/soong/android"
)
var (
globalAfdoProfileProjects = []string{
"vendor/google_data/pgo_profile/sampling/",
"toolchain/pgo-profiles/sampling/",
}
)
var afdoProfileProjectsConfigKey = android.NewOnceKey("AfdoProfileProjects")
const afdoCFlagsFormat = "-fprofile-sample-accurate -fprofile-sample-use=%s"
func getAfdoProfileProjects(config android.DeviceConfig) []string {
return config.OnceStringSlice(afdoProfileProjectsConfigKey, func() []string {
return append(globalAfdoProfileProjects, config.AfdoAdditionalProfileDirs()...)
})
}
func recordMissingAfdoProfileFile(ctx BaseModuleContext, missing string) {
getNamedMapForConfig(ctx.Config(), modulesMissingProfileFileKey).Store(missing, true)
}
type AfdoProperties struct {
Afdo bool
AfdoTarget *string `blueprint:"mutated"`
AfdoDeps []string `blueprint:"mutated"`
}
type afdo struct {
Properties AfdoProperties
}
func (afdo *afdo) props() []interface{} {
return []interface{}{&afdo.Properties}
}
func (afdo *afdo) AfdoEnabled() bool {
return afdo != nil && afdo.Properties.Afdo && afdo.Properties.AfdoTarget != nil
}
// Get list of profile file names, ordered by level of specialisation. For example:
// 1. libfoo_arm64.afdo
// 2. libfoo.afdo
// Add more specialisation as needed.
func getProfileFiles(ctx BaseModuleContext, moduleName string) []string {
var files []string
files = append(files, moduleName+"_"+ctx.Arch().ArchType.String()+".afdo")
files = append(files, moduleName+".afdo")
return files
}
func (props *AfdoProperties) getAfdoProfileFile(ctx BaseModuleContext, module string) android.OptionalPath {
// Test if the profile_file is present in any of the Afdo profile projects
for _, profileFile := range getProfileFiles(ctx, module) {
for _, profileProject := range getAfdoProfileProjects(ctx.DeviceConfig()) {
path := android.ExistentPathForSource(ctx, profileProject, profileFile)
if path.Valid() {
return path
}
}
}
// Record that this module's profile file is absent
missing := ctx.ModuleDir() + ":" + module
recordMissingAfdoProfileFile(ctx, missing)
return android.OptionalPathForPath(nil)
}
func (afdo *afdo) begin(ctx BaseModuleContext) {
if afdo.Properties.Afdo && !ctx.static() && !ctx.Host() {
module := ctx.ModuleName()
if afdo.Properties.getAfdoProfileFile(ctx, module).Valid() {
afdo.Properties.AfdoTarget = proptools.StringPtr(module)
}
}
}
func (afdo *afdo) flags(ctx ModuleContext, flags Flags) Flags {
if profile := afdo.Properties.AfdoTarget; profile != nil {
if profileFile := afdo.Properties.getAfdoProfileFile(ctx, *profile); profileFile.Valid() {
profileFilePath := profileFile.Path()
profileUseFlag := fmt.Sprintf(afdoCFlagsFormat, profileFile)
flags.Local.CFlags = append(flags.Local.CFlags, profileUseFlag)
flags.Local.LdFlags = append(flags.Local.LdFlags, profileUseFlag)
flags.Local.LdFlags = append(flags.Local.LdFlags, "-Wl,-mllvm,-no-warn-sample-unused=true")
// Update CFlagsDeps and LdFlagsDeps so the module is rebuilt
// if profileFile gets updated
flags.CFlagsDeps = append(flags.CFlagsDeps, profileFilePath)
flags.LdFlagsDeps = append(flags.LdFlagsDeps, profileFilePath)
}
}
return flags
}
// Propagate afdo requirements down from binaries
func afdoDepsMutator(mctx android.TopDownMutatorContext) {
if m, ok := mctx.Module().(*Module); ok && m.afdo.AfdoEnabled() {
afdoTarget := *m.afdo.Properties.AfdoTarget
mctx.WalkDeps(func(dep android.Module, parent android.Module) bool {
tag := mctx.OtherModuleDependencyTag(dep)
libTag, isLibTag := tag.(libraryDependencyTag)
// Do not recurse down non-static dependencies
if isLibTag {
if !libTag.static() {
return false
}
} else {
if tag != objDepTag && tag != reuseObjTag {
return false
}
}
if dep, ok := dep.(*Module); ok {
dep.afdo.Properties.AfdoDeps = append(dep.afdo.Properties.AfdoDeps, afdoTarget)
}
return true
})
}
}
// Create afdo variants for modules that need them
func afdoMutator(mctx android.BottomUpMutatorContext) {
if m, ok := mctx.Module().(*Module); ok && m.afdo != nil {
if m.afdo.AfdoEnabled() && !m.static() {
afdoTarget := *m.afdo.Properties.AfdoTarget
mctx.SetDependencyVariation(encodeTarget(afdoTarget))
}
variationNames := []string{""}
afdoDeps := android.FirstUniqueStrings(m.afdo.Properties.AfdoDeps)
for _, dep := range afdoDeps {
variationNames = append(variationNames, encodeTarget(dep))
}
if len(variationNames) > 1 {
modules := mctx.CreateVariations(variationNames...)
for i, name := range variationNames {
if name == "" {
continue
}
variation := modules[i].(*Module)
variation.Properties.PreventInstall = true
variation.Properties.HideFromMake = true
variation.afdo.Properties.AfdoTarget = proptools.StringPtr(decodeTarget(name))
}
}
}
}
// Encode target name to variation name.
func encodeTarget(target string) string {
if target == "" {
return ""
}
return "afdo-" + target
}
// Decode target name from variation name.
func decodeTarget(variation string) string {
if variation == "" {
return ""
}
return strings.TrimPrefix(variation, "afdo-")
}
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