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// Copyright (C) 2020 The Android Open Source Project
//
// 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 linkerconfig
import (
"fmt"
"sort"
"strings"
"github.com/google/blueprint/proptools"
"android/soong/android"
"android/soong/cc"
"android/soong/etc"
)
var (
pctx = android.NewPackageContext("android/soong/linkerconfig")
)
func init() {
pctx.HostBinToolVariable("conv_linker_config", "conv_linker_config")
registerLinkerConfigBuildComponent(android.InitRegistrationContext)
}
func registerLinkerConfigBuildComponent(ctx android.RegistrationContext) {
ctx.RegisterModuleType("linker_config", linkerConfigFactory)
}
type linkerConfigProperties struct {
// source linker configuration property file
Src *string `android:"path"`
// If set to true, allow module to be installed to one of the partitions.
// Default value is true.
// Installable should be marked as false for APEX configuration to avoid
// conflicts of configuration on /system/etc directory.
Installable *bool
}
type linkerConfig struct {
android.ModuleBase
properties linkerConfigProperties
outputFilePath android.OutputPath
installDirPath android.InstallPath
}
// Implement PrebuiltEtcModule interface to fit in APEX prebuilt list.
var _ etc.PrebuiltEtcModule = (*linkerConfig)(nil)
func (l *linkerConfig) BaseDir() string {
return "etc"
}
func (l *linkerConfig) SubDir() string {
return ""
}
func (l *linkerConfig) OutputFile() android.OutputPath {
return l.outputFilePath
}
var _ android.OutputFileProducer = (*linkerConfig)(nil)
func (l *linkerConfig) OutputFiles(tag string) (android.Paths, error) {
switch tag {
case "":
return android.Paths{l.outputFilePath}, nil
default:
return nil, fmt.Errorf("unsupported module reference tag %q", tag)
}
}
func (l *linkerConfig) GenerateAndroidBuildActions(ctx android.ModuleContext) {
input := android.PathForModuleSrc(ctx, android.String(l.properties.Src))
output := android.PathForModuleOut(ctx, "linker.config.pb").OutputPath
builder := android.NewRuleBuilder(pctx, ctx)
BuildLinkerConfig(ctx, builder, input, nil, output)
builder.Build("conv_linker_config", "Generate linker config protobuf "+output.String())
l.outputFilePath = output
l.installDirPath = android.PathForModuleInstall(ctx, "etc")
if !proptools.BoolDefault(l.properties.Installable, true) {
l.SkipInstall()
}
ctx.InstallFile(l.installDirPath, l.outputFilePath.Base(), l.outputFilePath)
}
func BuildLinkerConfig(ctx android.ModuleContext, builder *android.RuleBuilder,
input android.Path, otherModules []android.Module, output android.OutputPath) {
// First, convert the input json to protobuf format
interimOutput := android.PathForModuleOut(ctx, "temp.pb")
builder.Command().
BuiltTool("conv_linker_config").
Flag("proto").
FlagWithInput("-s ", input).
FlagWithOutput("-o ", interimOutput)
// Secondly, if there's provideLibs gathered from otherModules, append them
var provideLibs []string
for _, m := range otherModules {
if c, ok := m.(*cc.Module); ok && cc.IsStubTarget(c) {
for _, ps := range c.PackagingSpecs() {
provideLibs = append(provideLibs, ps.FileName())
}
}
}
provideLibs = android.FirstUniqueStrings(provideLibs)
sort.Strings(provideLibs)
if len(provideLibs) > 0 {
builder.Command().
BuiltTool("conv_linker_config").
Flag("append").
FlagWithInput("-s ", interimOutput).
FlagWithOutput("-o ", output).
FlagWithArg("--key ", "provideLibs").
FlagWithArg("--value ", proptools.ShellEscapeIncludingSpaces(strings.Join(provideLibs, " ")))
} else {
// If nothing to add, just cp to the final output
builder.Command().Text("cp").Input(interimOutput).Output(output)
}
builder.Temporary(interimOutput)
builder.DeleteTemporaryFiles()
}
// linker_config generates protobuf file from json file. This protobuf file will be used from
// linkerconfig while generating ld.config.txt. Format of this file can be found from
// https://android.googlesource.com/platform/system/linkerconfig/+/master/README.md
func linkerConfigFactory() android.Module {
m := &linkerConfig{}
m.AddProperties(&m.properties)
android.InitAndroidArchModule(m, android.HostAndDeviceSupported, android.MultilibFirst)
return m
}
func (l *linkerConfig) AndroidMkEntries() []android.AndroidMkEntries {
installable := proptools.BoolDefault(l.properties.Installable, true)
return []android.AndroidMkEntries{android.AndroidMkEntries{
Class: "ETC",
OutputFile: android.OptionalPathForPath(l.outputFilePath),
ExtraEntries: []android.AndroidMkExtraEntriesFunc{
func(ctx android.AndroidMkExtraEntriesContext, entries *android.AndroidMkEntries) {
entries.SetString("LOCAL_MODULE_PATH", l.installDirPath.ToMakePath().String())
entries.SetString("LOCAL_INSTALLED_MODULE_STEM", l.outputFilePath.Base())
entries.SetBoolIfTrue("LOCAL_UNINSTALLABLE_MODULE", !installable)
entries.SetString("LINKER_CONFIG_PATH_"+l.Name(), l.OutputFile().String())
},
},
}}
}
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