java/kotlin.go - SHIFTPHONES/android_build_soong - Gitiles

 // Copyright 2019 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 java

 import (
 	"bytes"
 	"encoding/base64"
 	"encoding/binary"
 	"path/filepath"
 	"strings"

 	"android/soong/android"

 	"github.com/google/blueprint"
 )

 var kotlinc = pctx.AndroidRemoteStaticRule("kotlinc", android.RemoteRuleSupports{Goma: true},
 	blueprint.RuleParams{
 		Command: `rm -rf "$classesDir" "$headerClassesDir" "$srcJarDir" "$kotlinBuildFile" "$emptyDir" && ` +
 			`mkdir -p "$classesDir" "$headerClassesDir" "$srcJarDir" "$emptyDir" && ` +
 			`${config.ZipSyncCmd} -d $srcJarDir -l $srcJarDir/list -f "*.java" $srcJars && ` +
 			`${config.GenKotlinBuildFileCmd} --classpath "$classpath" --name "$name"` +
 			` --out_dir "$classesDir" --srcs "$out.rsp" --srcs "$srcJarDir/list"` +
 			` $commonSrcFilesArg --out "$kotlinBuildFile" && ` +
 			`${config.KotlincCmd} ${config.KotlincGlobalFlags} ` +
 			` ${config.KotlincSuppressJDK9Warnings} ${config.JavacHeapFlags} ` +
 			` $kotlincFlags -jvm-target $kotlinJvmTarget -Xbuild-file=$kotlinBuildFile ` +
 			` -kotlin-home $emptyDir ` +
 			` -Xplugin=${config.KotlinAbiGenPluginJar} ` +
 			` -P plugin:org.jetbrains.kotlin.jvm.abi:outputDir=$headerClassesDir && ` +
 			`${config.SoongZipCmd} -jar -o $out -C $classesDir -D $classesDir -write_if_changed && ` +
 			`${config.SoongZipCmd} -jar -o $headerJar -C $headerClassesDir -D $headerClassesDir -write_if_changed && ` +
 			`rm -rf "$srcJarDir"`,
 		CommandDeps: []string{
 			"${config.KotlincCmd}",
 			"${config.KotlinCompilerJar}",
 			"${config.KotlinPreloaderJar}",
 			"${config.KotlinReflectJar}",
 			"${config.KotlinScriptRuntimeJar}",
 			"${config.KotlinStdlibJar}",
 			"${config.KotlinTrove4jJar}",
 			"${config.KotlinAnnotationJar}",
 			"${config.KotlinAbiGenPluginJar}",
 			"${config.GenKotlinBuildFileCmd}",
 			"${config.SoongZipCmd}",
 			"${config.ZipSyncCmd}",
 		},
 		Rspfile:        "$out.rsp",
 		RspfileContent: `$in`,
 		Restat:         true,
 	},
 	"kotlincFlags", "classpath", "srcJars", "commonSrcFilesArg", "srcJarDir", "classesDir",
 	"headerClassesDir", "headerJar", "kotlinJvmTarget", "kotlinBuildFile", "emptyDir", "name")

 func kotlinCommonSrcsList(ctx android.ModuleContext, commonSrcFiles android.Paths) android.OptionalPath {
 	if len(commonSrcFiles) > 0 {
 		// The list of common_srcs may be too long to put on the command line, but
 		// we can't use the rsp file because it is already being used for srcs.
 		// Insert a second rule to write out the list of resources to a file.
 		commonSrcsList := android.PathForModuleOut(ctx, "kotlinc_common_srcs.list")
 		rule := android.NewRuleBuilder(pctx, ctx)
 		rule.Command().Text("cp").
 			FlagWithRspFileInputList("", commonSrcsList.ReplaceExtension(ctx, "rsp"), commonSrcFiles).
 			Output(commonSrcsList)
 		rule.Build("kotlin_common_srcs_list", "kotlin common_srcs list")
 		return android.OptionalPathForPath(commonSrcsList)
 	}
 	return android.OptionalPath{}
 }

 // kotlinCompile takes .java and .kt sources and srcJars, and compiles the .kt sources into a classes jar in outputFile.
 func kotlinCompile(ctx android.ModuleContext, outputFile, headerOutputFile android.WritablePath,
 	srcFiles, commonSrcFiles, srcJars android.Paths,
 	flags javaBuilderFlags) {

 	var deps android.Paths
 	deps = append(deps, flags.kotlincClasspath...)
 	deps = append(deps, flags.kotlincDeps...)
 	deps = append(deps, srcJars...)
 	deps = append(deps, commonSrcFiles...)

 	kotlinName := filepath.Join(ctx.ModuleDir(), ctx.ModuleSubDir(), ctx.ModuleName())
 	kotlinName = strings.ReplaceAll(kotlinName, "/", "__")

 	commonSrcsList := kotlinCommonSrcsList(ctx, commonSrcFiles)
 	commonSrcFilesArg := ""
 	if commonSrcsList.Valid() {
 		deps = append(deps, commonSrcsList.Path())
 		commonSrcFilesArg = "--common_srcs " + commonSrcsList.String()
 	}

 	ctx.Build(pctx, android.BuildParams{
 		Rule:           kotlinc,
 		Description:    "kotlinc",
 		Output:         outputFile,
 		ImplicitOutput: headerOutputFile,
 		Inputs:         srcFiles,
 		Implicits:      deps,
 		Args: map[string]string{
 			"classpath":         flags.kotlincClasspath.FormJavaClassPath(""),
 			"kotlincFlags":      flags.kotlincFlags,
 			"commonSrcFilesArg": commonSrcFilesArg,
 			"srcJars":           strings.Join(srcJars.Strings(), " "),
 			"classesDir":        android.PathForModuleOut(ctx, "kotlinc", "classes").String(),
 			"headerClassesDir":  android.PathForModuleOut(ctx, "kotlinc", "header_classes").String(),
 			"headerJar":         headerOutputFile.String(),
 			"srcJarDir":         android.PathForModuleOut(ctx, "kotlinc", "srcJars").String(),
 			"kotlinBuildFile":   android.PathForModuleOut(ctx, "kotlinc-build.xml").String(),
 			"emptyDir":          android.PathForModuleOut(ctx, "kotlinc", "empty").String(),
 			// http://b/69160377 kotlinc only supports -jvm-target 1.6 and 1.8
 			"kotlinJvmTarget": "1.8",
 			"name":            kotlinName,
 		},
 	})
 }

 var kaptStubs = pctx.AndroidRemoteStaticRule("kaptStubs", android.RemoteRuleSupports{Goma: true},
 	blueprint.RuleParams{
 		Command: `rm -rf "$srcJarDir" "$kotlinBuildFile" "$kaptDir" && ` +
 			`mkdir -p "$srcJarDir" "$kaptDir/sources" "$kaptDir/classes" && ` +
 			`${config.ZipSyncCmd} -d $srcJarDir -l $srcJarDir/list -f "*.java" $srcJars && ` +
 			`${config.GenKotlinBuildFileCmd} --classpath "$classpath" --name "$name"` +
 			` --srcs "$out.rsp" --srcs "$srcJarDir/list"` +
 			` $commonSrcFilesArg --out "$kotlinBuildFile" && ` +
 			`${config.KotlincCmd} ${config.KotlincGlobalFlags} ` +
 			`${config.KaptSuppressJDK9Warnings} ${config.KotlincSuppressJDK9Warnings} ` +
 			`${config.JavacHeapFlags} $kotlincFlags -Xplugin=${config.KotlinKaptJar} ` +
 			`-P plugin:org.jetbrains.kotlin.kapt3:sources=$kaptDir/sources ` +
 			`-P plugin:org.jetbrains.kotlin.kapt3:classes=$kaptDir/classes ` +
 			`-P plugin:org.jetbrains.kotlin.kapt3:stubs=$kaptDir/stubs ` +
 			`-P plugin:org.jetbrains.kotlin.kapt3:correctErrorTypes=true ` +
 			`-P plugin:org.jetbrains.kotlin.kapt3:aptMode=stubs ` +
 			`-P plugin:org.jetbrains.kotlin.kapt3:javacArguments=$encodedJavacFlags ` +
 			`$kaptProcessorPath ` +
 			`$kaptProcessor ` +
 			`-Xbuild-file=$kotlinBuildFile && ` +
 			`${config.SoongZipCmd} -jar -o $out -C $kaptDir/stubs -D $kaptDir/stubs && ` +
 			`rm -rf "$srcJarDir"`,
 		CommandDeps: []string{
 			"${config.KotlincCmd}",
 			"${config.KotlinCompilerJar}",
 			"${config.KotlinKaptJar}",
 			"${config.GenKotlinBuildFileCmd}",
 			"${config.SoongZipCmd}",
 			"${config.ZipSyncCmd}",
 		},
 		Rspfile:        "$out.rsp",
 		RspfileContent: `$in`,
 	},
 	"kotlincFlags", "encodedJavacFlags", "kaptProcessorPath", "kaptProcessor",
 	"classpath", "srcJars", "commonSrcFilesArg", "srcJarDir", "kaptDir", "kotlinJvmTarget",
 	"kotlinBuildFile", "name", "classesJarOut")

 // kotlinKapt performs Kotlin-compatible annotation processing.  It takes .kt and .java sources and srcjars, and runs
 // annotation processors over all of them, producing a srcjar of generated code in outputFile.  The srcjar should be
 // added as an additional input to kotlinc and javac rules, and the javac rule should have annotation processing
 // disabled.
 func kotlinKapt(ctx android.ModuleContext, srcJarOutputFile, resJarOutputFile android.WritablePath,
 	srcFiles, commonSrcFiles, srcJars android.Paths,
 	flags javaBuilderFlags) {

 	srcFiles = append(android.Paths(nil), srcFiles...)

 	var deps android.Paths
 	deps = append(deps, flags.kotlincClasspath...)
 	deps = append(deps, flags.kotlincDeps...)
 	deps = append(deps, srcJars...)
 	deps = append(deps, flags.processorPath...)
 	deps = append(deps, commonSrcFiles...)

 	commonSrcsList := kotlinCommonSrcsList(ctx, commonSrcFiles)
 	commonSrcFilesArg := ""
 	if commonSrcsList.Valid() {
 		deps = append(deps, commonSrcsList.Path())
 		commonSrcFilesArg = "--common_srcs " + commonSrcsList.String()
 	}

 	kaptProcessorPath := flags.processorPath.FormRepeatedClassPath("-P plugin:org.jetbrains.kotlin.kapt3:apclasspath=")

 	kaptProcessor := ""
 	for i, p := range flags.processors {
 		if i > 0 {
 			kaptProcessor += " "
 		}
 		kaptProcessor += "-P plugin:org.jetbrains.kotlin.kapt3:processors=" + p
 	}

 	encodedJavacFlags := kaptEncodeFlags([][2]string{
 		{"-source", flags.javaVersion.String()},
 		{"-target", flags.javaVersion.String()},
 	})

 	kotlinName := filepath.Join(ctx.ModuleDir(), ctx.ModuleSubDir(), ctx.ModuleName())
 	kotlinName = strings.ReplaceAll(kotlinName, "/", "__")

 	// First run kapt to generate .java stubs from .kt files
 	kaptStubsJar := android.PathForModuleOut(ctx, "kapt", "stubs.jar")
 	ctx.Build(pctx, android.BuildParams{
 		Rule:        kaptStubs,
 		Description: "kapt stubs",
 		Output:      kaptStubsJar,
 		Inputs:      srcFiles,
 		Implicits:   deps,
 		Args: map[string]string{
 			"classpath":         flags.kotlincClasspath.FormJavaClassPath(""),
 			"kotlincFlags":      flags.kotlincFlags,
 			"commonSrcFilesArg": commonSrcFilesArg,
 			"srcJars":           strings.Join(srcJars.Strings(), " "),
 			"srcJarDir":         android.PathForModuleOut(ctx, "kapt", "srcJars").String(),
 			"kotlinBuildFile":   android.PathForModuleOut(ctx, "kapt", "build.xml").String(),
 			"kaptProcessorPath": strings.Join(kaptProcessorPath, " "),
 			"kaptProcessor":     kaptProcessor,
 			"kaptDir":           android.PathForModuleOut(ctx, "kapt/gen").String(),
 			"encodedJavacFlags": encodedJavacFlags,
 			"name":              kotlinName,
 			"classesJarOut":     resJarOutputFile.String(),
 		},
 	})

 	// Then run turbine to perform annotation processing on the stubs and any .java srcFiles.
 	javaSrcFiles := srcFiles.FilterByExt(".java")
 	turbineSrcJars := append(android.Paths{kaptStubsJar}, srcJars...)
 	TurbineApt(ctx, srcJarOutputFile, resJarOutputFile, javaSrcFiles, turbineSrcJars, flags)
 }

 // kapt converts a list of key, value pairs into a base64 encoded Java serialization, which is what kapt expects.
 func kaptEncodeFlags(options [][2]string) string {
 	buf := &bytes.Buffer{}

 	binary.Write(buf, binary.BigEndian, uint32(len(options)))
 	for _, option := range options {
 		binary.Write(buf, binary.BigEndian, uint16(len(option[0])))
 		buf.WriteString(option[0])
 		binary.Write(buf, binary.BigEndian, uint16(len(option[1])))
 		buf.WriteString(option[1])
 	}

 	header := &bytes.Buffer{}
 	header.Write([]byte{0xac, 0xed, 0x00, 0x05}) // java serialization header

 	if buf.Len() < 256 {
 		header.WriteByte(0x77) // blockdata
 		header.WriteByte(byte(buf.Len()))
 	} else {
 		header.WriteByte(0x7a) // blockdatalong
 		binary.Write(header, binary.BigEndian, uint32(buf.Len()))
 	}

 	return base64.StdEncoding.EncodeToString(append(header.Bytes(), buf.Bytes()...))
 }
	// Copyright 2019 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 java

	import (
	"bytes"
	"encoding/base64"
	"encoding/binary"
	"path/filepath"
	"strings"

	"android/soong/android"

	"github.com/google/blueprint"
	)

	var kotlinc = pctx.AndroidRemoteStaticRule("kotlinc", android.RemoteRuleSupports{Goma: true},
	blueprint.RuleParams{
	Command: `rm -rf "$classesDir" "$headerClassesDir" "$srcJarDir" "$kotlinBuildFile" "$emptyDir" && ` +
	`mkdir -p "$classesDir" "$headerClassesDir" "$srcJarDir" "$emptyDir" && ` +
	`${config.ZipSyncCmd} -d $srcJarDir -l $srcJarDir/list -f "*.java" $srcJars && ` +
	`${config.GenKotlinBuildFileCmd} --classpath "$classpath" --name "$name"` +
	` --out_dir "$classesDir" --srcs "$out.rsp" --srcs "$srcJarDir/list"` +
	` $commonSrcFilesArg --out "$kotlinBuildFile" && ` +
	`${config.KotlincCmd} ${config.KotlincGlobalFlags} ` +
	` ${config.KotlincSuppressJDK9Warnings} ${config.JavacHeapFlags} ` +
	` $kotlincFlags -jvm-target $kotlinJvmTarget -Xbuild-file=$kotlinBuildFile ` +
	` -kotlin-home $emptyDir ` +
	` -Xplugin=${config.KotlinAbiGenPluginJar} ` +
	` -P plugin:org.jetbrains.kotlin.jvm.abi:outputDir=$headerClassesDir && ` +
	`${config.SoongZipCmd} -jar -o $out -C $classesDir -D $classesDir -write_if_changed && ` +
	`${config.SoongZipCmd} -jar -o $headerJar -C $headerClassesDir -D $headerClassesDir -write_if_changed && ` +
	`rm -rf "$srcJarDir"`,
	CommandDeps: []string{
	"${config.KotlincCmd}",
	"${config.KotlinCompilerJar}",
	"${config.KotlinPreloaderJar}",
	"${config.KotlinReflectJar}",
	"${config.KotlinScriptRuntimeJar}",
	"${config.KotlinStdlibJar}",
	"${config.KotlinTrove4jJar}",
	"${config.KotlinAnnotationJar}",
	"${config.KotlinAbiGenPluginJar}",
	"${config.GenKotlinBuildFileCmd}",
	"${config.SoongZipCmd}",
	"${config.ZipSyncCmd}",
	},
	Rspfile: "$out.rsp",
	RspfileContent: `$in`,
	Restat: true,
	},
	"kotlincFlags", "classpath", "srcJars", "commonSrcFilesArg", "srcJarDir", "classesDir",
	"headerClassesDir", "headerJar", "kotlinJvmTarget", "kotlinBuildFile", "emptyDir", "name")

	func kotlinCommonSrcsList(ctx android.ModuleContext, commonSrcFiles android.Paths) android.OptionalPath {
	if len(commonSrcFiles) > 0 {
	// The list of common_srcs may be too long to put on the command line, but
	// we can't use the rsp file because it is already being used for srcs.
	// Insert a second rule to write out the list of resources to a file.
	commonSrcsList := android.PathForModuleOut(ctx, "kotlinc_common_srcs.list")
	rule := android.NewRuleBuilder(pctx, ctx)
	rule.Command().Text("cp").
	FlagWithRspFileInputList("", commonSrcsList.ReplaceExtension(ctx, "rsp"), commonSrcFiles).
	Output(commonSrcsList)
	rule.Build("kotlin_common_srcs_list", "kotlin common_srcs list")
	return android.OptionalPathForPath(commonSrcsList)
	}
	return android.OptionalPath{}
	}

	// kotlinCompile takes .java and .kt sources and srcJars, and compiles the .kt sources into a classes jar in outputFile.
	func kotlinCompile(ctx android.ModuleContext, outputFile, headerOutputFile android.WritablePath,
	srcFiles, commonSrcFiles, srcJars android.Paths,
	flags javaBuilderFlags) {

	var deps android.Paths
	deps = append(deps, flags.kotlincClasspath...)
	deps = append(deps, flags.kotlincDeps...)
	deps = append(deps, srcJars...)
	deps = append(deps, commonSrcFiles...)

	kotlinName := filepath.Join(ctx.ModuleDir(), ctx.ModuleSubDir(), ctx.ModuleName())
	kotlinName = strings.ReplaceAll(kotlinName, "/", "__")

	commonSrcsList := kotlinCommonSrcsList(ctx, commonSrcFiles)
	commonSrcFilesArg := ""
	if commonSrcsList.Valid() {
	deps = append(deps, commonSrcsList.Path())
	commonSrcFilesArg = "--common_srcs " + commonSrcsList.String()
	}

	ctx.Build(pctx, android.BuildParams{
	Rule: kotlinc,
	Description: "kotlinc",
	Output: outputFile,
	ImplicitOutput: headerOutputFile,
	Inputs: srcFiles,
	Implicits: deps,
	Args: map[string]string{
	"classpath": flags.kotlincClasspath.FormJavaClassPath(""),
	"kotlincFlags": flags.kotlincFlags,
	"commonSrcFilesArg": commonSrcFilesArg,
	"srcJars": strings.Join(srcJars.Strings(), " "),
	"classesDir": android.PathForModuleOut(ctx, "kotlinc", "classes").String(),
	"headerClassesDir": android.PathForModuleOut(ctx, "kotlinc", "header_classes").String(),
	"headerJar": headerOutputFile.String(),
	"srcJarDir": android.PathForModuleOut(ctx, "kotlinc", "srcJars").String(),
	"kotlinBuildFile": android.PathForModuleOut(ctx, "kotlinc-build.xml").String(),
	"emptyDir": android.PathForModuleOut(ctx, "kotlinc", "empty").String(),
	// http://b/69160377 kotlinc only supports -jvm-target 1.6 and 1.8
	"kotlinJvmTarget": "1.8",
	"name": kotlinName,
	},
	})
	}

	var kaptStubs = pctx.AndroidRemoteStaticRule("kaptStubs", android.RemoteRuleSupports{Goma: true},
	blueprint.RuleParams{
	Command: `rm -rf "$srcJarDir" "$kotlinBuildFile" "$kaptDir" && ` +
	`mkdir -p "$srcJarDir" "$kaptDir/sources" "$kaptDir/classes" && ` +
	`${config.ZipSyncCmd} -d $srcJarDir -l $srcJarDir/list -f "*.java" $srcJars && ` +
	`${config.GenKotlinBuildFileCmd} --classpath "$classpath" --name "$name"` +
	` --srcs "$out.rsp" --srcs "$srcJarDir/list"` +
	` $commonSrcFilesArg --out "$kotlinBuildFile" && ` +
	`${config.KotlincCmd} ${config.KotlincGlobalFlags} ` +
	`${config.KaptSuppressJDK9Warnings} ${config.KotlincSuppressJDK9Warnings} ` +
	`${config.JavacHeapFlags} $kotlincFlags -Xplugin=${config.KotlinKaptJar} ` +
	`-P plugin:org.jetbrains.kotlin.kapt3:sources=$kaptDir/sources ` +
	`-P plugin:org.jetbrains.kotlin.kapt3:classes=$kaptDir/classes ` +
	`-P plugin:org.jetbrains.kotlin.kapt3:stubs=$kaptDir/stubs ` +
	`-P plugin:org.jetbrains.kotlin.kapt3:correctErrorTypes=true ` +
	`-P plugin:org.jetbrains.kotlin.kapt3:aptMode=stubs ` +
	`-P plugin:org.jetbrains.kotlin.kapt3:javacArguments=$encodedJavacFlags ` +
	`$kaptProcessorPath ` +
	`$kaptProcessor ` +
	`-Xbuild-file=$kotlinBuildFile && ` +
	`${config.SoongZipCmd} -jar -o $out -C $kaptDir/stubs -D $kaptDir/stubs && ` +
	`rm -rf "$srcJarDir"`,
	CommandDeps: []string{
	"${config.KotlincCmd}",
	"${config.KotlinCompilerJar}",
	"${config.KotlinKaptJar}",
	"${config.GenKotlinBuildFileCmd}",
	"${config.SoongZipCmd}",
	"${config.ZipSyncCmd}",
	},
	Rspfile: "$out.rsp",
	RspfileContent: `$in`,
	},
	"kotlincFlags", "encodedJavacFlags", "kaptProcessorPath", "kaptProcessor",
	"classpath", "srcJars", "commonSrcFilesArg", "srcJarDir", "kaptDir", "kotlinJvmTarget",
	"kotlinBuildFile", "name", "classesJarOut")

	// kotlinKapt performs Kotlin-compatible annotation processing. It takes .kt and .java sources and srcjars, and runs
	// annotation processors over all of them, producing a srcjar of generated code in outputFile. The srcjar should be
	// added as an additional input to kotlinc and javac rules, and the javac rule should have annotation processing
	// disabled.
	func kotlinKapt(ctx android.ModuleContext, srcJarOutputFile, resJarOutputFile android.WritablePath,
	srcFiles, commonSrcFiles, srcJars android.Paths,
	flags javaBuilderFlags) {

	srcFiles = append(android.Paths(nil), srcFiles...)

	var deps android.Paths
	deps = append(deps, flags.kotlincClasspath...)
	deps = append(deps, flags.kotlincDeps...)
	deps = append(deps, srcJars...)
	deps = append(deps, flags.processorPath...)
	deps = append(deps, commonSrcFiles...)

	commonSrcsList := kotlinCommonSrcsList(ctx, commonSrcFiles)
	commonSrcFilesArg := ""
	if commonSrcsList.Valid() {
	deps = append(deps, commonSrcsList.Path())
	commonSrcFilesArg = "--common_srcs " + commonSrcsList.String()
	}

	kaptProcessorPath := flags.processorPath.FormRepeatedClassPath("-P plugin:org.jetbrains.kotlin.kapt3:apclasspath=")

	kaptProcessor := ""
	for i, p := range flags.processors {
	if i > 0 {
	kaptProcessor += " "
	}
	kaptProcessor += "-P plugin:org.jetbrains.kotlin.kapt3:processors=" + p
	}

	encodedJavacFlags := kaptEncodeFlags([][2]string{
	{"-source", flags.javaVersion.String()},
	{"-target", flags.javaVersion.String()},
	})

	kotlinName := filepath.Join(ctx.ModuleDir(), ctx.ModuleSubDir(), ctx.ModuleName())
	kotlinName = strings.ReplaceAll(kotlinName, "/", "__")

	// First run kapt to generate .java stubs from .kt files
	kaptStubsJar := android.PathForModuleOut(ctx, "kapt", "stubs.jar")
	ctx.Build(pctx, android.BuildParams{
	Rule: kaptStubs,
	Description: "kapt stubs",
	Output: kaptStubsJar,
	Inputs: srcFiles,
	Implicits: deps,
	Args: map[string]string{
	"classpath": flags.kotlincClasspath.FormJavaClassPath(""),
	"kotlincFlags": flags.kotlincFlags,
	"commonSrcFilesArg": commonSrcFilesArg,
	"srcJars": strings.Join(srcJars.Strings(), " "),
	"srcJarDir": android.PathForModuleOut(ctx, "kapt", "srcJars").String(),
	"kotlinBuildFile": android.PathForModuleOut(ctx, "kapt", "build.xml").String(),
	"kaptProcessorPath": strings.Join(kaptProcessorPath, " "),
	"kaptProcessor": kaptProcessor,
	"kaptDir": android.PathForModuleOut(ctx, "kapt/gen").String(),
	"encodedJavacFlags": encodedJavacFlags,
	"name": kotlinName,
	"classesJarOut": resJarOutputFile.String(),
	},
	})

	// Then run turbine to perform annotation processing on the stubs and any .java srcFiles.
	javaSrcFiles := srcFiles.FilterByExt(".java")
	turbineSrcJars := append(android.Paths{kaptStubsJar}, srcJars...)
	TurbineApt(ctx, srcJarOutputFile, resJarOutputFile, javaSrcFiles, turbineSrcJars, flags)
	}

	// kapt converts a list of key, value pairs into a base64 encoded Java serialization, which is what kapt expects.
	func kaptEncodeFlags(options [][2]string) string {
	buf := &bytes.Buffer{}

	binary.Write(buf, binary.BigEndian, uint32(len(options)))
	for _, option := range options {
	binary.Write(buf, binary.BigEndian, uint16(len(option[0])))
	buf.WriteString(option[0])
	binary.Write(buf, binary.BigEndian, uint16(len(option[1])))
	buf.WriteString(option[1])
	}

	header := &bytes.Buffer{}
	header.Write([]byte{0xac, 0xed, 0x00, 0x05}) // java serialization header

	if buf.Len() < 256 {
	header.WriteByte(0x77) // blockdata
	header.WriteByte(byte(buf.Len()))
	} else {
	header.WriteByte(0x7a) // blockdatalong
	binary.Write(header, binary.BigEndian, uint32(buf.Len()))
	}

	return base64.StdEncoding.EncodeToString(append(header.Bytes(), buf.Bytes()...))
	}