diff --git a/java/dexpreopt_bootjars.go b/java/dexpreopt_bootjars.go
new file mode 100644
index 0000000..0656ff4
--- /dev/null
+++ b/java/dexpreopt_bootjars.go
@@ -0,0 +1,463 @@
+// 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 (
+	"path/filepath"
+	"strings"
+
+	"android/soong/android"
+	"android/soong/dexpreopt"
+
+	"github.com/google/blueprint/pathtools"
+	"github.com/google/blueprint/proptools"
+)
+
+func init() {
+	android.RegisterSingletonType("dex_bootjars", dexpreoptBootJarsFactory)
+}
+
+// The image "location" is a symbolic path that with multiarchitecture
+// support doesn't really exist on the device. Typically it is
+// /system/framework/boot.art and should be the same for all supported
+// architectures on the device. The concrete architecture specific
+// content actually ends up in a "filename" that contains an
+// architecture specific directory name such as arm, arm64, mips,
+// mips64, x86, x86_64.
+//
+// Here are some example values for an x86_64 / x86 configuration:
+//
+// bootImages["x86_64"] = "out/soong/generic_x86_64/dex_bootjars/system/framework/x86_64/boot.art"
+// dexpreopt.PathToLocation(bootImages["x86_64"], "x86_64") = "out/soong/generic_x86_64/dex_bootjars/system/framework/boot.art"
+//
+// bootImages["x86"] = "out/soong/generic_x86_64/dex_bootjars/system/framework/x86/boot.art"
+// dexpreopt.PathToLocation(bootImages["x86"])= "out/soong/generic_x86_64/dex_bootjars/system/framework/boot.art"
+//
+// The location is passed as an argument to the ART tools like dex2oat instead of the real path. The ART tools
+// will then reconstruct the real path, so the rules must have a dependency on the real path.
+
+type bootJarsInfo struct {
+	dir        android.OutputPath
+	symbolsDir android.OutputPath
+	images     map[android.ArchType]android.OutputPath
+	installs   map[android.ArchType]android.RuleBuilderInstalls
+
+	vdexInstalls       map[android.ArchType]android.RuleBuilderInstalls
+	unstrippedInstalls map[android.ArchType]android.RuleBuilderInstalls
+	profileInstalls    android.RuleBuilderInstalls
+
+	global dexpreopt.GlobalConfig
+
+	preoptBootModules     []string
+	preoptBootLocations   []string
+	preoptBootDex         android.WritablePaths
+	allBootModules        []string
+	allBootLocations      []string
+	bootclasspath         string
+	systemServerClasspath string
+}
+
+var dexpreoptBootJarsInfoKey = android.NewOnceKey("dexpreoptBootJarsInfoKey")
+
+// dexpreoptBootJarsInfo creates all the paths for singleton files the first time it is called, which may be
+// from a ModuleContext that needs to reference a file that will be created by a singleton rule that hasn't
+// yet been created.
+func dexpreoptBootJarsInfo(ctx android.PathContext) *bootJarsInfo {
+	return ctx.Config().Once(dexpreoptBootJarsInfoKey, func() interface{} {
+
+		info := &bootJarsInfo{
+			dir:        android.PathForOutput(ctx, ctx.Config().DeviceName(), "dex_bootjars"),
+			symbolsDir: android.PathForOutput(ctx, ctx.Config().DeviceName(), "dex_bootjars_unstripped"),
+			images:     make(map[android.ArchType]android.OutputPath),
+			installs:   make(map[android.ArchType]android.RuleBuilderInstalls),
+
+			vdexInstalls:       make(map[android.ArchType]android.RuleBuilderInstalls),
+			unstrippedInstalls: make(map[android.ArchType]android.RuleBuilderInstalls),
+		}
+
+		for _, target := range ctx.Config().Targets[android.Android] {
+			info.images[target.Arch.ArchType] = info.dir.Join(ctx,
+				"system/framework", target.Arch.ArchType.String(), "boot.art")
+		}
+
+		info.global = dexpreoptGlobalConfig(ctx)
+		computeBootClasspath(ctx, info)
+		computeSystemServerClasspath(ctx, info)
+
+		return info
+	}).(*bootJarsInfo)
+}
+
+func concat(lists ...[]string) []string {
+	var size int
+	for _, l := range lists {
+		size += len(l)
+	}
+	ret := make([]string, 0, size)
+	for _, l := range lists {
+		ret = append(ret, l...)
+	}
+	return ret
+}
+
+func computeBootClasspath(ctx android.PathContext, info *bootJarsInfo) {
+	runtimeModules := android.RemoveListFromList(info.global.TargetCoreJars, info.global.ProductUpdatableBootModules)
+	nonFrameworkModules := concat(runtimeModules, info.global.ProductUpdatableBootModules)
+	frameworkModules := android.RemoveListFromList(info.global.BootJars, nonFrameworkModules)
+
+	var nonUpdatableBootModules []string
+	var nonUpdatableBootLocations []string
+
+	for _, m := range runtimeModules {
+		nonUpdatableBootModules = append(nonUpdatableBootModules, m)
+		nonUpdatableBootLocations = append(nonUpdatableBootLocations,
+			filepath.Join("/apex/com.android.runtime/javalib", m+".jar"))
+	}
+
+	for _, m := range frameworkModules {
+		nonUpdatableBootModules = append(nonUpdatableBootModules, m)
+		nonUpdatableBootLocations = append(nonUpdatableBootLocations,
+			filepath.Join("/system/framework", m+".jar"))
+	}
+
+	// The path to bootclasspath dex files needs to be known at module GenerateAndroidBuildAction time, before
+	// the bootclasspath modules have been compiled.  Set up known paths for them, the singleton rules will copy
+	// them there.
+	// TODO: use module dependencies instead
+	var nonUpdatableBootDex android.WritablePaths
+	for _, m := range nonUpdatableBootModules {
+		nonUpdatableBootDex = append(nonUpdatableBootDex,
+			android.PathForOutput(ctx, ctx.Config().DeviceName(), "dex_bootjars_input", m+".jar"))
+	}
+
+	allBootModules := concat(nonUpdatableBootModules, info.global.ProductUpdatableBootModules)
+	allBootLocations := concat(nonUpdatableBootLocations, info.global.ProductUpdatableBootLocations)
+
+	bootclasspath := strings.Join(allBootLocations, ":")
+
+	info.preoptBootModules = nonUpdatableBootModules
+	info.preoptBootLocations = nonUpdatableBootLocations
+	info.preoptBootDex = nonUpdatableBootDex
+	info.allBootModules = allBootModules
+	info.allBootLocations = allBootLocations
+	info.bootclasspath = bootclasspath
+}
+
+func computeSystemServerClasspath(ctx android.PathContext, info *bootJarsInfo) {
+	var systemServerClasspathLocations []string
+	for _, m := range info.global.SystemServerJars {
+		systemServerClasspathLocations = append(systemServerClasspathLocations,
+			filepath.Join("/system/framework", m+".jar"))
+	}
+
+	info.systemServerClasspath = strings.Join(systemServerClasspathLocations, ":")
+}
+func dexpreoptBootJarsFactory() android.Singleton {
+	return dexpreoptBootJars{}
+}
+
+func skipDexpreoptBootJars(ctx android.PathContext) bool {
+	if ctx.Config().UnbundledBuild() {
+		return true
+	}
+
+	if len(ctx.Config().Targets[android.Android]) == 0 {
+		// Host-only build
+		return true
+	}
+
+	return false
+}
+
+type dexpreoptBootJars struct{}
+
+// dexpreoptBoot singleton rules
+func (dexpreoptBootJars) GenerateBuildActions(ctx android.SingletonContext) {
+	if skipDexpreoptBootJars(ctx) {
+		return
+	}
+
+	info := dexpreoptBootJarsInfo(ctx)
+
+	// Skip recompiling the boot image for the second sanitization phase. We'll get separate paths
+	// and invalidate first-stage artifacts which are crucial to SANITIZE_LITE builds.
+	// Note: this is technically incorrect. Compiled code contains stack checks which may depend
+	//       on ASAN settings.
+	if len(ctx.Config().SanitizeDevice()) == 1 &&
+		ctx.Config().SanitizeDevice()[0] == "address" &&
+		info.global.SanitizeLite {
+		return
+	}
+
+	bootDexJars := make(android.Paths, len(info.preoptBootModules))
+
+	ctx.VisitAllModules(func(module android.Module) {
+		// Collect dex jar paths for the modules listed above.
+		if j, ok := module.(Dependency); ok {
+			name := ctx.ModuleName(module)
+			if i := android.IndexList(name, info.preoptBootModules); i != -1 {
+				bootDexJars[i] = j.DexJar()
+			}
+		}
+	})
+
+	var missingDeps []string
+	// Ensure all modules were converted to paths
+	for i := range bootDexJars {
+		if bootDexJars[i] == nil {
+			if ctx.Config().AllowMissingDependencies() {
+				missingDeps = append(missingDeps, info.preoptBootModules[i])
+				bootDexJars[i] = android.PathForOutput(ctx, "missing")
+			} else {
+				ctx.Errorf("failed to find dex jar path for module %q",
+					info.preoptBootModules[i])
+			}
+		}
+	}
+
+	// The path to bootclasspath dex files needs to be known at module GenerateAndroidBuildAction time, before
+	// the bootclasspath modules have been compiled.  Copy the dex jars there so the module rules that have
+	// already been set up can find them.
+	for i := range bootDexJars {
+		ctx.Build(pctx, android.BuildParams{
+			Rule:   android.Cp,
+			Input:  bootDexJars[i],
+			Output: info.preoptBootDex[i],
+		})
+	}
+
+	profile := bootImageProfileRule(ctx, info, missingDeps)
+
+	if !ctx.Config().DisableDexPreopt() {
+		targets := ctx.Config().Targets[android.Android]
+		if ctx.Config().SecondArchIsTranslated() {
+			targets = targets[:1]
+		}
+
+		for _, target := range targets {
+			dexPreoptBootImageRule(ctx, info, target.Arch.ArchType, profile, missingDeps)
+		}
+	}
+}
+
+func dexPreoptBootImageRule(ctx android.SingletonContext, info *bootJarsInfo,
+	arch android.ArchType, profile android.Path, missingDeps []string) {
+
+	symbolsDir := info.symbolsDir.Join(ctx, "system/framework", arch.String())
+	symbolsFile := symbolsDir.Join(ctx, "boot.oat")
+	outputDir := info.dir.Join(ctx, "system/framework", arch.String())
+	outputPath := info.images[arch]
+	oatLocation := pathtools.ReplaceExtension(dexpreopt.PathToLocation(outputPath.String(), arch), "oat")
+
+	rule := android.NewRuleBuilder()
+	rule.MissingDeps(missingDeps)
+
+	rule.Command().Text("mkdir").Flag("-p").Flag(symbolsDir.String())
+	rule.Command().Text("rm").Flag("-f").
+		Flag(symbolsDir.Join(ctx, "*.art").String()).
+		Flag(symbolsDir.Join(ctx, "*.oat").String()).
+		Flag(symbolsDir.Join(ctx, "*.invocation").String())
+	rule.Command().Text("rm").Flag("-f").
+		Flag(outputDir.Join(ctx, "*.art").String()).
+		Flag(outputDir.Join(ctx, "*.oat").String()).
+		Flag(outputDir.Join(ctx, "*.invocation").String())
+
+	cmd := rule.Command()
+
+	extraFlags := ctx.Config().Getenv("ART_BOOT_IMAGE_EXTRA_ARGS")
+	if extraFlags == "" {
+		// Use ANDROID_LOG_TAGS to suppress most logging by default...
+		cmd.Text(`ANDROID_LOG_TAGS="*:e"`)
+	} else {
+		// ...unless the boot image is generated specifically for testing, then allow all logging.
+		cmd.Text(`ANDROID_LOG_TAGS="*:v"`)
+	}
+
+	invocationPath := outputPath.ReplaceExtension(ctx, "invocation")
+
+	cmd.Tool(info.global.Tools.Dex2oat).
+		Flag("--avoid-storing-invocation").
+		FlagWithOutput("--write-invocation-to=", invocationPath.String()).ImplicitOutput(invocationPath.String()).
+		Flag("--runtime-arg").FlagWithArg("-Xms", info.global.Dex2oatImageXms).
+		Flag("--runtime-arg").FlagWithArg("-Xmx", info.global.Dex2oatImageXmx)
+
+	if profile == nil {
+		cmd.FlagWithArg("--image-classes=", info.global.PreloadedClasses)
+	} else {
+		cmd.FlagWithArg("--compiler-filter=", "speed-profile")
+		cmd.FlagWithInput("--profile-file=", profile.String())
+	}
+
+	if info.global.DirtyImageObjects != "" {
+		cmd.FlagWithArg("--dirty-image-objects=", info.global.DirtyImageObjects)
+	}
+
+	cmd.
+		FlagForEachInput("--dex-file=", info.preoptBootDex.Strings()).
+		FlagForEachArg("--dex-location=", info.preoptBootLocations).
+		Flag("--generate-debug-info").
+		Flag("--generate-build-id").
+		FlagWithArg("--oat-symbols=", symbolsFile.String()).
+		Flag("--strip").
+		FlagWithOutput("--oat-file=", outputPath.ReplaceExtension(ctx, "oat").String()).
+		FlagWithArg("--oat-location=", oatLocation).
+		FlagWithOutput("--image=", outputPath.String()).
+		FlagWithArg("--base=", ctx.Config().LibartImgDeviceBaseAddress()).
+		FlagWithArg("--instruction-set=", arch.String()).
+		FlagWithArg("--instruction-set-variant=", info.global.CpuVariant[arch]).
+		FlagWithArg("--instruction-set-features=", info.global.InstructionSetFeatures[arch]).
+		FlagWithArg("--android-root=", info.global.EmptyDirectory).
+		FlagWithArg("--no-inline-from=", "core-oj.jar").
+		Flag("--abort-on-hard-verifier-error")
+
+	if info.global.BootFlags != "" {
+		cmd.Flag(info.global.BootFlags)
+	}
+
+	if extraFlags != "" {
+		cmd.Flag(extraFlags)
+	}
+
+	cmd.Textf(`|| ( echo %s ; false )`, proptools.ShellEscape([]string{failureMessage})[0])
+
+	installDir := filepath.Join("/system/framework", arch.String())
+	vdexInstallDir := filepath.Join("/system/framework")
+
+	var extraFiles android.WritablePaths
+	var vdexInstalls android.RuleBuilderInstalls
+	var unstrippedInstalls android.RuleBuilderInstalls
+
+	// dex preopt on the bootclasspath produces multiple files.  The first dex file
+	// is converted into to boot.art (to match the legacy assumption that boot.art
+	// exists), and the rest are converted to boot-<name>.art.
+	// In addition, each .art file has an associated .oat and .vdex file, and an
+	// unstripped .oat file
+	for i, m := range info.preoptBootModules {
+		name := "boot"
+		if i != 0 {
+			name += "-" + m
+		}
+
+		art := outputDir.Join(ctx, name+".art")
+		oat := outputDir.Join(ctx, name+".oat")
+		vdex := outputDir.Join(ctx, name+".vdex")
+		unstrippedOat := symbolsDir.Join(ctx, name+".oat")
+
+		extraFiles = append(extraFiles, art, oat, vdex, unstrippedOat)
+
+		// Install the .oat and .art files.
+		rule.Install(art.String(), filepath.Join(installDir, art.Base()))
+		rule.Install(oat.String(), filepath.Join(installDir, oat.Base()))
+
+		// The vdex files are identical between architectures, install them to a shared location.  The Make rules will
+		// only use the install rules for one architecture, and will create symlinks into the architecture-specific
+		// directories.
+		vdexInstalls = append(vdexInstalls,
+			android.RuleBuilderInstall{vdex.String(), filepath.Join(vdexInstallDir, vdex.Base())})
+
+		// Install the unstripped oat files.  The Make rules will put these in $(TARGET_OUT_UNSTRIPPED)
+		unstrippedInstalls = append(unstrippedInstalls,
+			android.RuleBuilderInstall{unstrippedOat.String(), filepath.Join(installDir, unstrippedOat.Base())})
+	}
+
+	cmd.ImplicitOutputs(extraFiles.Strings())
+
+	rule.Build(pctx, ctx, "bootJarsDexpreopt_"+arch.String(), "dexpreopt boot jars "+arch.String())
+
+	// save output and installed files for makevars
+	info.installs[arch] = rule.Installs()
+	info.vdexInstalls[arch] = vdexInstalls
+	info.unstrippedInstalls[arch] = unstrippedInstalls
+}
+
+const failureMessage = `ERROR: Dex2oat failed to compile a boot image.
+It is likely that the boot classpath is inconsistent.
+Rebuild with ART_BOOT_IMAGE_EXTRA_ARGS="--runtime-arg -verbose:verifier" to see verification errors.`
+
+func bootImageProfileRule(ctx android.SingletonContext, info *bootJarsInfo, missingDeps []string) android.WritablePath {
+	if len(info.global.BootImageProfiles) == 0 {
+		return nil
+	}
+
+	tools := info.global.Tools
+
+	rule := android.NewRuleBuilder()
+	rule.MissingDeps(missingDeps)
+
+	var bootImageProfile string
+	if len(info.global.BootImageProfiles) > 1 {
+		combinedBootImageProfile := info.dir.Join(ctx, "boot-image-profile.txt")
+		rule.Command().Text("cat").Inputs(info.global.BootImageProfiles).Output(combinedBootImageProfile.String())
+		bootImageProfile = combinedBootImageProfile.String()
+	} else {
+		bootImageProfile = info.global.BootImageProfiles[0]
+	}
+
+	profile := info.dir.Join(ctx, "boot.prof")
+
+	rule.Command().
+		Text(`ANDROID_LOG_TAGS="*:e"`).
+		Tool(tools.Profman).
+		FlagWithArg("--create-profile-from=", bootImageProfile).
+		FlagForEachInput("--apk=", info.preoptBootDex.Strings()).
+		FlagForEachArg("--dex-location=", info.preoptBootLocations).
+		FlagWithOutput("--reference-profile-file=", profile.String())
+
+	rule.Install(profile.String(), "/system/etc/boot-image.prof")
+
+	rule.Build(pctx, ctx, "bootJarsProfile", "profile boot jars")
+
+	info.profileInstalls = rule.Installs()
+
+	return profile
+}
+
+func init() {
+	android.RegisterMakeVarsProvider(pctx, bootImageMakeVars)
+}
+
+// Export paths to Make.  INTERNAL_PLATFORM_HIDDENAPI_FLAGS is used by Make rules in art/ and cts/.
+// Both paths are used to call dist-for-goals.
+func bootImageMakeVars(ctx android.MakeVarsContext) {
+	if skipDexpreoptBootJars(ctx) {
+		return
+	}
+
+	info := dexpreoptBootJarsInfo(ctx)
+	for arch, _ := range info.images {
+		ctx.Strict("DEXPREOPT_IMAGE_"+arch.String(), info.images[arch].String())
+
+		var builtInstalled []string
+		for _, install := range info.installs[arch] {
+			builtInstalled = append(builtInstalled, install.From+":"+install.To)
+		}
+
+		var unstrippedBuiltInstalled []string
+		for _, install := range info.unstrippedInstalls[arch] {
+			unstrippedBuiltInstalled = append(unstrippedBuiltInstalled, install.From+":"+install.To)
+		}
+
+		ctx.Strict("DEXPREOPT_IMAGE_BUILT_INSTALLED_"+arch.String(), info.installs[arch].String())
+		ctx.Strict("DEXPREOPT_IMAGE_UNSTRIPPED_BUILT_INSTALLED_"+arch.String(), info.unstrippedInstalls[arch].String())
+		ctx.Strict("DEXPREOPT_IMAGE_VDEX_BUILT_INSTALLED_"+arch.String(), info.vdexInstalls[arch].String())
+	}
+
+	ctx.Strict("DEXPREOPT_IMAGE_PROFILE_BUILT_INSTALLED", info.profileInstalls.String())
+
+	ctx.Strict("DEXPREOPT_BOOTCLASSPATH_DEX_FILES", strings.Join(info.preoptBootDex.Strings(), " "))
+	ctx.Strict("DEXPREOPT_BOOTCLASSPATH_DEX_LOCATIONS", strings.Join(info.preoptBootLocations, " "))
+	ctx.Strict("PRODUCT_BOOTCLASSPATH", info.bootclasspath)
+	ctx.Strict("PRODUCT_SYSTEM_SERVER_CLASSPATH", info.systemServerClasspath)
+}