diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index 614a7ca..da63891 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -62,6 +62,7 @@
 LOCAL_DROIDDOC_STUB_OUT_DIR:=
 LOCAL_DROIDDOC_TEMPLATE_DIR:=
 LOCAL_DROIDDOC_USE_STANDARD_DOCLET:=
+LOCAL_DX_FLAGS:=
 LOCAL_EMMA_COVERAGE_FILTER:=
 LOCAL_EMMA_INSTRUMENT:=
 LOCAL_EXPORT_C_INCLUDE_DEPS:=
@@ -94,8 +95,7 @@
 LOCAL_JACK_CLASSPATH:=
 LOCAL_JACK_COVERAGE_EXCLUDE_FILTER:=
 LOCAL_JACK_COVERAGE_INCLUDE_FILTER:=
-# full or incremental
-LOCAL_JACK_ENABLED:=full
+LOCAL_JACK_ENABLED:=$(DEFAULT_JACK_ENABLED) # '' (ie disabled), disabled, full, incremental
 LOCAL_JACK_FLAGS:=
 LOCAL_JACK_PLUGIN:=
 LOCAL_JACK_PLUGIN_PATH:=
diff --git a/core/combo/javac.mk b/core/combo/javac.mk
index 9042d83..7f66ea8 100644
--- a/core/combo/javac.mk
+++ b/core/combo/javac.mk
@@ -9,6 +9,11 @@
 #   COMMON_JAVAC -- Java compiler command with common arguments
 #
 
+ifndef ANDROID_COMPILE_WITH_JACK
+# Defines if compilation with jack is enabled by default.
+ANDROID_COMPILE_WITH_JACK := true
+endif
+
 common_jdk_flags := -Xmaxerrs 9999999
 
 # Use the indexer wrapper to index the codebase instead of the javac compiler
diff --git a/core/config.mk b/core/config.mk
index 2f43f46..f40f697 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -605,6 +605,11 @@
 FAT16COPY := build/tools/fat16copy.py
 CHECK_LINK_TYPE := build/tools/check_link_type.py
 
+ifeq ($(ANDROID_COMPILE_WITH_JACK),true)
+DEFAULT_JACK_ENABLED:=full
+else
+DEFAULT_JACK_ENABLED:=
+endif
 ifneq ($(ANDROID_JACK_EXTRA_ARGS),)
 JACK_DEFAULT_ARGS :=
 DEFAULT_JACK_EXTRA_ARGS := $(ANDROID_JACK_EXTRA_ARGS)
diff --git a/core/configure_local_jack.mk b/core/configure_local_jack.mk
index 446bab7..2270c88 100644
--- a/core/configure_local_jack.mk
+++ b/core/configure_local_jack.mk
@@ -21,9 +21,16 @@
 LOCAL_JACK_ENABLED := $(strip $(LOCAL_JACK_ENABLED))
 LOCAL_MODULE := $(strip $(LOCAL_MODULE))
 
-ifeq ($(filter full incremental,$(LOCAL_JACK_ENABLED)),)
+ifneq ($(LOCAL_JACK_ENABLED),full)
+ifneq ($(LOCAL_JACK_ENABLED),incremental)
+ifdef LOCAL_JACK_ENABLED
+ifneq ($(LOCAL_JACK_ENABLED),disabled)
 $(error $(LOCAL_PATH): invalid LOCAL_JACK_ENABLED "$(LOCAL_JACK_ENABLED)" for $(LOCAL_MODULE))
 endif
+endif
+LOCAL_JACK_ENABLED :=
+endif
+endif
 
 ifdef $(LOCAL_MODULE).JACK_VERSION
 LOCAL_JACK_VERSION := $($(LOCAL_MODULE).JACK_VERSION)
diff --git a/core/definitions.mk b/core/definitions.mk
index da5aff1..dbbdd1d 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -2353,8 +2353,9 @@
 $(hide) tr ' ' '\n' < $@.java-source-list \
     | sort -u > $@.java-source-list-uniq
 $(hide) if [ -s $@.java-source-list-uniq ] ; then \
-	$(call call-jack) \
+	$(call call-jack,$(PRIVATE_JACK_EXTRA_ARGS)) \
 	    $(strip $(PRIVATE_JACK_FLAGS)) \
+	    $(strip $(PRIVATE_JACK_DEBUG_FLAGS)) \
 	    $(addprefix --classpath ,$(strip \
 	        $(call normalize-path-list,$(call reverse-list,$(PRIVATE_STATIC_JACK_LIBRARIES)) $(PRIVATE_JACK_SHARED_LIBRARIES)))) \
 	    -D jack.import.resource.policy=keep-first \
@@ -2514,6 +2515,25 @@
     $(addprefix -ix , $(PRIVATE_EMMA_COVERAGE_FILTER))
 endef
 
+#TODO: use a smaller -Xmx value for most libraries;
+#      only core.jar and framework.jar need a heap this big.
+define transform-classes.jar-to-dex
+@echo "target Dex: $(PRIVATE_MODULE)"
+@mkdir -p $(dir $@)
+$(hide) rm -f $(dir $@)classes*.dex
+$(hide) $(DX) \
+    -JXms16M -JXmx2048M \
+    --dex --output=$(dir $@) \
+    $(if $(NO_OPTIMIZE_DX), \
+        --no-optimize) \
+    $(if $(GENERATE_DEX_DEBUG), \
+	    --debug --verbose \
+	    --dump-to=$(@:.dex=.lst) \
+	    --dump-width=1000) \
+    $(PRIVATE_DX_FLAGS) \
+    $<
+endef
+
 # Create a mostly-empty .jar file that we'll add to later.
 # The MacOS jar tool doesn't like creating empty jar files,
 # so we need to give it something.
@@ -2533,6 +2553,17 @@
 $(call create-empty-package-at,$@)
 endef
 
+# Copy an arhchive file and delete any class files and empty folders inside.
+# $(1): the source archive file.
+# $(2): the destination archive file.
+define initialize-package-file
+@mkdir -p $(dir $(2))
+$(hide) cp -f $(1) $(2)
+$(hide) zip -qd $(2) "*.class" \
+    $(if $(strip $(PRIVATE_DONT_DELETE_JAR_DIRS)),,"*/") \
+    || true # Ignore the error when nothing to delete.
+endef
+
 #TODO: we kinda want to build different asset packages for
 #      different configurations, then combine them later (or something).
 #      Per-locale, etc.
diff --git a/core/dpi_specific_apk.mk b/core/dpi_specific_apk.mk
index bcc5c18..1ca01d5 100644
--- a/core/dpi_specific_apk.mk
+++ b/core/dpi_specific_apk.mk
@@ -31,9 +31,15 @@
 $(built_dpi_apk): $(additional_certificates)
 $(built_dpi_apk): PRIVATE_ADDITIONAL_CERTIFICATES := $(additional_certificates)
 
+$(built_dpi_apk): PRIVATE_SOURCE_ARCHIVE :=
 ifneq ($(full_classes_jar),)
-$(built_dpi_apk): PRIVATE_JACK_INTERMEDIATES_DIR := $(intermediates.COMMON)/jack-rsc
 $(built_dpi_apk): PRIVATE_DEX_FILE := $(built_dex)
+ifndef LOCAL_JACK_ENABLED
+# Use the jarjar processed arhive as the initial package file.
+$(built_dpi_apk): PRIVATE_SOURCE_ARCHIVE := $(full_classes_jarjar_jar)
+else
+$(built_dpi_apk): PRIVATE_JACK_INTERMEDIATES_DIR := $(intermediates.COMMON)/jack-rsc
+endif # LOCAL_JACK_ENABLED
 $(built_dpi_apk): $(built_dex)
 else
 $(built_dpi_apk): PRIVATE_DEX_FILE :=
@@ -46,7 +52,9 @@
 $(built_dpi_apk) : $(AAPT)
 $(built_dpi_apk) : $(all_res_assets) $(jni_shared_libraries) $(full_android_manifest)
 	@echo "target Package: $(PRIVATE_MODULE) ($@)"
-	$(create-empty-package)
+	$(if $(PRIVATE_SOURCE_ARCHIVE),\
+	  $(call initialize-package-file,$(PRIVATE_SOURCE_ARCHIVE),$@),\
+	  $(create-empty-package))
 	$(add-assets-to-package)
 ifneq ($(jni_shared_libraries),)
 	$(add-jni-shared-libs-to-package)
@@ -56,8 +64,10 @@
 	$(if $(PRIVATE_EXTRA_JAR_ARGS),$(call add-java-resources-to,$@))
 else
 	$(add-dex-to-package)
+ifdef LOCAL_JACK_ENABLED
 	$(add-carried-jack-resources)
 endif
+endif
 	$(sign-package)
 
 # Set up global variables to register this apk to the higher-level dependency graph.
diff --git a/core/host_dalvik_java_library.mk b/core/host_dalvik_java_library.mk
index 64b610e..0e35844 100644
--- a/core/host_dalvik_java_library.mk
+++ b/core/host_dalvik_java_library.mk
@@ -31,27 +31,39 @@
 #######################################
 include $(BUILD_SYSTEM)/host_java_library_common.mk
 #######################################
+ifdef LOCAL_JACK_ENABLED
 ifeq ($(LOCAL_IS_STATIC_JAVA_LIBRARY),true)
   # For static library, $(LOCAL_BUILT_MODULE) is $(full_classes_jack).
   LOCAL_BUILT_MODULE_STEM := classes.jack
 endif
+endif
 
 ifneq ($(LOCAL_NO_STANDARD_LIBRARIES),true)
   LOCAL_JAVA_LIBRARIES :=  core-oj-hostdex core-libart-hostdex $(LOCAL_JAVA_LIBRARIES)
 endif
 
+full_classes_compiled_jar := $(intermediates.COMMON)/classes-full-debug.jar
+full_classes_jarjar_jar := $(intermediates.COMMON)/classes-jarjar.jar
+full_classes_jar := $(intermediates.COMMON)/classes.jar
 full_classes_jack := $(intermediates.COMMON)/classes.jack
 jack_check_timestamp := $(intermediates.COMMON)/jack.check.timestamp
 built_dex := $(intermediates.COMMON)/classes.dex
 
 LOCAL_INTERMEDIATE_TARGETS += \
+    $(full_classes_compiled_jar) \
+    $(full_classes_jarjar_jar) \
     $(full_classes_jack) \
+    $(full_classes_jar) \
     $(jack_check_timestamp) \
     $(built_dex)
 
 # See comment in java.mk
 ifndef LOCAL_CHECKED_MODULE
+ifdef LOCAL_JACK_ENABLED
 LOCAL_CHECKED_MODULE := $(jack_check_timestamp)
+else
+LOCAL_CHECKED_MODULE := $(full_classes_compiled_jar)
+endif
 endif
 
 #######################################
@@ -65,6 +77,61 @@
 
 $(cleantarget): PRIVATE_CLEAN_FILES += $(intermediates.COMMON)
 
+ifndef LOCAL_JACK_ENABLED
+
+$(full_classes_compiled_jar): PRIVATE_JAVA_LAYERS_FILE := $(layers_file)
+$(full_classes_compiled_jar): PRIVATE_JAVACFLAGS := $(GLOBAL_JAVAC_DEBUG_FLAGS) $(LOCAL_JAVACFLAGS)
+$(full_classes_compiled_jar): PRIVATE_JAR_EXCLUDE_FILES :=
+$(full_classes_compiled_jar): PRIVATE_JAR_PACKAGES :=
+$(full_classes_compiled_jar): PRIVATE_JAR_EXCLUDE_PACKAGES :=
+$(full_classes_compiled_jar): \
+        $(java_sources) \
+        $(java_resource_sources) \
+        $(full_java_lib_deps) \
+        $(jar_manifest_file) \
+        $(proto_java_sources_file_stamp) \
+        $(LOCAL_ADDITIONAL_DEPENDENCIES)
+	$(transform-host-java-to-package)
+
+# Run jarjar if necessary, otherwise just copy the file.
+ifneq ($(strip $(LOCAL_JARJAR_RULES)),)
+$(full_classes_jarjar_jar): PRIVATE_JARJAR_RULES := $(LOCAL_JARJAR_RULES)
+$(full_classes_jarjar_jar): $(full_classes_compiled_jar) $(LOCAL_JARJAR_RULES) | $(JARJAR)
+	@echo JarJar: $@
+	$(hide) java -jar $(JARJAR) process $(PRIVATE_JARJAR_RULES) $< $@
+else
+$(full_classes_jarjar_jar): $(full_classes_compiled_jar) | $(ACP)
+	@echo Copying: $@
+	$(hide) $(ACP) -fp $< $@
+endif
+
+$(full_classes_jar): $(full_classes_jarjar_jar) | $(ACP)
+	@echo Copying: $@
+	$(hide) $(ACP) -fp $< $@
+
+ifeq ($(LOCAL_IS_STATIC_JAVA_LIBRARY),true)
+# No dex; all we want are the .class files with resources.
+$(LOCAL_BUILT_MODULE) : $(java_resource_sources)
+$(LOCAL_BUILT_MODULE) : $(full_classes_jar)
+	@echo "host Static Jar: $(PRIVATE_MODULE) ($@)"
+	$(copy-file-to-target)
+
+else # !LOCAL_IS_STATIC_JAVA_LIBRARY
+$(built_dex): PRIVATE_INTERMEDIATES_DIR := $(intermediates.COMMON)
+$(built_dex): PRIVATE_DX_FLAGS := $(LOCAL_DX_FLAGS)
+$(built_dex): $(full_classes_jar) $(DX)
+	$(transform-classes.jar-to-dex)
+
+$(LOCAL_BUILT_MODULE): PRIVATE_DEX_FILE := $(built_dex)
+$(LOCAL_BUILT_MODULE): PRIVATE_SOURCE_ARCHIVE := $(full_classes_jarjar_jar)
+$(LOCAL_BUILT_MODULE): PRIVATE_DONT_DELETE_JAR_DIRS := $(LOCAL_DONT_DELETE_JAR_DIRS)
+$(LOCAL_BUILT_MODULE): $(built_dex) $(java_resource_sources)
+	@echo "Host Jar: $(PRIVATE_MODULE) ($@)"
+	$(call initialize-package-file,$(PRIVATE_SOURCE_ARCHIVE),$@)
+	$(add-dex-to-package)
+
+endif # !LOCAL_IS_STATIC_JAVA_LIBRARY
+else # LOCAL_JACK_ENABLED
 $(LOCAL_INTERMEDIATE_TARGETS): \
   PRIVATE_JACK_INTERMEDIATES_DIR := $(intermediates.COMMON)/jack-rsc
 
@@ -116,6 +183,7 @@
 $(jack_check_timestamp): $(jack_all_deps) | setup-jack-server
 	@echo Checking build with Jack: $@
 	$(jack-check-java)
+endif # LOCAL_JACK_ENABLED
 
 USE_CORE_LIB_BOOTCLASSPATH :=
 
diff --git a/core/java.mk b/core/java.mk
index baf097b..d5fcf61 100644
--- a/core/java.mk
+++ b/core/java.mk
@@ -96,14 +96,34 @@
 intermediates := $(call local-intermediates-dir)
 intermediates.COMMON := $(call local-intermediates-dir,COMMON)
 
+# Choose leaf name for the compiled jar file.
+ifeq ($(LOCAL_EMMA_INSTRUMENT),true)
+full_classes_compiled_jar_leaf := classes-no-debug-var.jar
+built_dex_intermediate_leaf := no-local
+else
+full_classes_compiled_jar_leaf := classes-full-debug.jar
+built_dex_intermediate_leaf := with-local
+endif
+
 ifeq ($(LOCAL_PROGUARD_ENABLED),disabled)
 LOCAL_PROGUARD_ENABLED :=
 endif
 
-full_classes_compiled_jar := $(intermediates.COMMON)/classes-full-debug.jar
-full_classes_jarjar_jar := $(intermediates.COMMON)/classes-jarjar.jar
-full_classes_proguard_jar := $(intermediates.COMMON)/proguard.classes.jar
-built_dex_intermediate := $(intermediates.COMMON)/dex-dir/classes.dex
+ifdef LOCAL_PROGUARD_ENABLED
+proguard_jar_leaf := proguard.classes.jar
+else
+proguard_jar_leaf := noproguard.classes.jar
+endif
+
+full_classes_compiled_jar := $(intermediates.COMMON)/$(full_classes_compiled_jar_leaf)
+jarjar_leaf := classes-jarjar.jar
+full_classes_jarjar_jar := $(intermediates.COMMON)/$(jarjar_leaf)
+emma_intermediates_dir := $(intermediates.COMMON)/emma_out
+# emma is hardcoded to use the leaf name of its input for the output file --
+# only the output directory can be changed
+full_classes_emma_jar := $(emma_intermediates_dir)/lib/$(jarjar_leaf)
+full_classes_proguard_jar := $(intermediates.COMMON)/$(proguard_jar_leaf)
+built_dex_intermediate := $(intermediates.COMMON)/$(built_dex_intermediate_leaf)/classes.dex
 full_classes_stubs_jar := $(intermediates.COMMON)/stubs.jar
 
 ifeq ($(LOCAL_MODULE_CLASS)$(LOCAL_SRC_FILES)$(LOCAL_STATIC_JAVA_LIBRARIES)$(LOCAL_SOURCE_FILES_ALL_GENERATED),APPS)
@@ -123,6 +143,7 @@
 LOCAL_INTERMEDIATE_TARGETS += \
     $(full_classes_compiled_jar) \
     $(full_classes_jarjar_jar) \
+    $(full_classes_emma_jar) \
     $(full_classes_jar) \
     $(full_classes_proguard_jar) \
     $(built_dex_intermediate) \
@@ -322,7 +343,11 @@
 # command line.
 ifndef LOCAL_CHECKED_MODULE
 ifdef full_classes_jar
+ifdef LOCAL_JACK_ENABLED
 LOCAL_CHECKED_MODULE := $(jack_check_timestamp)
+else
+LOCAL_CHECKED_MODULE := $(full_classes_compiled_jar)
+endif
 endif
 endif
 
@@ -433,8 +458,31 @@
 	$(hide) $(ACP) -fp $< $@
 endif
 
+ifeq ($(LOCAL_EMMA_INSTRUMENT),true)
+$(full_classes_emma_jar): PRIVATE_EMMA_COVERAGE_FILE := $(intermediates.COMMON)/coverage.emma.ignore
+$(full_classes_emma_jar): PRIVATE_EMMA_INTERMEDIATES_DIR := $(emma_intermediates_dir)
+# module level coverage filter can be defined using LOCAL_EMMA_COVERAGE_FILTER
+# in Android.mk
+ifdef LOCAL_EMMA_COVERAGE_FILTER
+$(full_classes_emma_jar): PRIVATE_EMMA_COVERAGE_FILTER := $(LOCAL_EMMA_COVERAGE_FILTER)
+else
+# by default, avoid applying emma instrumentation onto emma classes itself,
+# otherwise there will be exceptions thrown
+$(full_classes_emma_jar): PRIVATE_EMMA_COVERAGE_FILTER := *,-emma,-emmarun,-com.vladium.*
+endif
+# this rule will generate both $(PRIVATE_EMMA_COVERAGE_FILE) and
+# $(full_classes_emma_jar)
+$(full_classes_emma_jar): $(full_classes_jarjar_jar) | $(EMMA_JAR)
+	$(transform-classes.jar-to-emma)
+
+else
+$(full_classes_emma_jar): $(full_classes_jarjar_jar)
+	@echo Copying: $@
+	$(copy-file-to-target)
+endif
+
 # Keep a copy of the jar just before proguard processing.
-$(full_classes_jar): $(full_classes_jarjar_jar) | $(ACP)
+$(full_classes_jar): $(full_classes_emma_jar) | $(ACP)
 	@echo Copying: $@
 	$(hide) $(ACP) -fp $< $@
 
@@ -481,7 +529,11 @@
 ifeq ($(filter nosystem,$(LOCAL_PROGUARD_ENABLED)),)
 common_proguard_flag_files += $(BUILD_SYSTEM)/proguard.flags
 ifeq ($(LOCAL_EMMA_INSTRUMENT),true)
+ifdef LOCAL_JACK_ENABLED
 common_proguard_flag_files += $(BUILD_SYSTEM)/proguard.jacoco.flags
+else
+common_proguard_flags += -include $(BUILD_SYSTEM)/proguard.emma.flags
+endif # LOCAL_JACK_ENABLED
 endif
 # If this is a test package, add proguard keep flags for tests.
 ifneq ($(LOCAL_INSTRUMENTATION_FOR)$(filter tests,$(LOCAL_MODULE_TAGS)),)
@@ -521,9 +573,10 @@
     -applymapping $(link_instr_intermediates_dir.COMMON)/proguard_dictionary \
     -verbose \
     $(legacy_proguard_flags)
-
+ifdef LOCAL_JACK_ENABLED
 jack_proguard_flags += -applymapping $(link_instr_intermediates_dir.COMMON)/jack_dictionary
 full_jack_deps += $(link_instr_intermediates_dir.COMMON)/jack_dictionary
+endif
 
 # Sometimes (test + main app) uses different keep rules from the main app -
 # apply the main app's dictionary anyway.
@@ -556,6 +609,21 @@
 
 endif # LOCAL_PROGUARD_ENABLED defined
 
+ifndef LOCAL_JACK_ENABLED
+$(built_dex_intermediate): PRIVATE_DX_FLAGS := $(LOCAL_DX_FLAGS)
+# If you instrument class files that have local variable debug information in
+# them emma does not correctly maintain the local variable table.
+# This will cause an error when you try to convert the class files for Android.
+# The workaround here is to build different dex file here based on emma switch
+# then later copy into classes.dex. When emma is on, dx is run with --no-locals
+# option to remove local variable information
+ifeq ($(LOCAL_EMMA_INSTRUMENT),true)
+$(built_dex_intermediate): PRIVATE_DX_FLAGS += --no-locals
+endif
+$(built_dex_intermediate): $(full_classes_proguard_jar) $(DX)
+	$(transform-classes.jar-to-dex)
+endif # LOCAL_JACK_ENABLED is disabled
+
 $(built_dex): $(built_dex_intermediate) | $(ACP)
 	@echo Copying: $@
 	$(hide) mkdir -p $(dir $@)
@@ -588,6 +656,7 @@
 
 endif  # full_classes_jar is defined
 
+ifdef LOCAL_JACK_ENABLED
 $(LOCAL_INTERMEDIATE_TARGETS): \
 	PRIVATE_JACK_INTERMEDIATES_DIR := $(intermediates.COMMON)/jack-rsc
 ifeq ($(LOCAL_JACK_ENABLED),incremental)
@@ -689,3 +758,4 @@
 	@echo Building with Jack: $@
 	$(java-to-jack)
 endif  # full_classes_jar is defined
+endif # LOCAL_JACK_ENABLED
diff --git a/core/java_common.mk b/core/java_common.mk
index dbdea26..8fc4fb6 100644
--- a/core/java_common.mk
+++ b/core/java_common.mk
@@ -320,6 +320,7 @@
 ###########################################################
 # JACK
 ###########################################################
+ifdef LOCAL_JACK_ENABLED
 ifdef need_compile_java
 
 LOCAL_JACK_FLAGS += -D jack.java.source.version=$(LOCAL_JAVA_LANGUAGE_VERSION)
@@ -373,6 +374,7 @@
 $(LOCAL_INTERMEDIATE_TARGETS): PRIVATE_JARJAR_RULES := $(LOCAL_JARJAR_RULES)
 
 endif  # need_compile_java
+endif # LOCAL_JACK_ENABLED
 
 
 ###########################################################
diff --git a/core/java_library.mk b/core/java_library.mk
index b132fa6..f770a54 100644
--- a/core/java_library.mk
+++ b/core/java_library.mk
@@ -29,9 +29,11 @@
 include $(BUILD_SYSTEM)/configure_local_jack.mk
 #################################
 
+ifdef LOCAL_JACK_ENABLED
 ifdef LOCAL_IS_STATIC_JAVA_LIBRARY
 LOCAL_BUILT_MODULE_STEM := classes.jack
 endif
+endif
 
 intermediates.COMMON := $(call local-intermediates-dir,COMMON)
 
@@ -46,8 +48,12 @@
 ifeq (true,$(EMMA_INSTRUMENT))
 ifeq (true,$(LOCAL_EMMA_INSTRUMENT))
 ifeq (true,$(EMMA_INSTRUMENT_STATIC))
+ifdef LOCAL_JACK_ENABLED
 # Jack supports coverage with Jacoco
 LOCAL_STATIC_JAVA_LIBRARIES += jacocoagent
+else
+LOCAL_STATIC_JAVA_LIBRARIES += emma
+endif # LOCAL_JACK_ENABLED
 endif # LOCAL_EMMA_INSTRUMENT
 endif # EMMA_INSTRUMENT_STATIC
 else
@@ -61,21 +67,37 @@
 ifeq ($(LOCAL_IS_STATIC_JAVA_LIBRARY),true)
 # No dex; all we want are the .class files with resources.
 $(common_javalib.jar) : $(java_resource_sources)
+ifdef LOCAL_PROGUARD_ENABLED
+$(common_javalib.jar) : $(full_classes_proguard_jar)
+else
 $(common_javalib.jar) : $(full_classes_jar)
+endif
 	@echo "target Static Jar: $(PRIVATE_MODULE) ($@)"
 	$(copy-file-to-target)
 
+ifdef LOCAL_JACK_ENABLED
 $(LOCAL_BUILT_MODULE) : $(full_classes_jack)
+else
+$(LOCAL_BUILT_MODULE) : $(common_javalib.jar)
+endif
 	$(copy-file-to-target)
 
 else # !LOCAL_IS_STATIC_JAVA_LIBRARY
 
 $(common_javalib.jar): PRIVATE_DEX_FILE := $(built_dex)
+$(common_javalib.jar): PRIVATE_SOURCE_ARCHIVE := $(full_classes_jarjar_jar)
+$(common_javalib.jar): PRIVATE_DONT_DELETE_JAR_DIRS := $(LOCAL_DONT_DELETE_JAR_DIRS)
 $(common_javalib.jar) : $(built_dex) $(java_resource_sources) | $(ZIPTIME)
 	@echo "target Jar: $(PRIVATE_MODULE) ($@)"
+ifdef LOCAL_JACK_ENABLED
 	$(create-empty-package)
+else
+	$(call initialize-package-file,$(PRIVATE_SOURCE_ARCHIVE),$@)
+endif
 	$(add-dex-to-package)
+ifdef LOCAL_JACK_ENABLED
 	$(add-carried-jack-resources)
+endif
 	$(remove-timestamps-from-package)
 
 ifdef LOCAL_DEX_PREOPT
diff --git a/core/package_internal.mk b/core/package_internal.mk
index 694716a..2e4878d 100644
--- a/core/package_internal.mk
+++ b/core/package_internal.mk
@@ -209,10 +209,12 @@
 endif # !custom
 LOCAL_PROGUARD_FLAGS := $(addprefix -include ,$(proguard_options_file)) $(LOCAL_PROGUARD_FLAGS)
 
+ifdef LOCAL_JACK_ENABLED
 ifndef LOCAL_JACK_PROGUARD_FLAGS
     LOCAL_JACK_PROGUARD_FLAGS := $(LOCAL_PROGUARD_FLAGS)
 endif
 LOCAL_JACK_PROGUARD_FLAGS := $(addprefix -include ,$(proguard_options_file)) $(LOCAL_JACK_PROGUARD_FLAGS)
+endif # LOCAL_JACK_ENABLED
 
 ifeq (true,$(EMMA_INSTRUMENT))
 ifndef LOCAL_EMMA_INSTRUMENT
@@ -225,22 +227,35 @@
 LOCAL_EMMA_INSTRUMENT := false
 endif # EMMA_INSTRUMENT is true
 
-ifneq ($(LOCAL_SRC_FILES)$(LOCAL_STATIC_JAVA_LIBRARIES)$(LOCAL_SOURCE_FILES_ALL_GENERATED),)
-# Only add jacocoagent if the package contains some java code
 ifeq (true,$(LOCAL_EMMA_INSTRUMENT))
 ifeq (true,$(EMMA_INSTRUMENT_STATIC))
+ifdef LOCAL_JACK_ENABLED
 # Jack supports coverage with Jacoco
+ifneq ($(LOCAL_SRC_FILES)$(LOCAL_STATIC_JAVA_LIBRARIES)$(LOCAL_SOURCE_FILES_ALL_GENERATED),)
+# Only add jacocoagent if the package contains some java code
 LOCAL_STATIC_JAVA_LIBRARIES += jacocoagent
-else  # ! EMMA_INSTRUMENT_STATIC
+endif # Contains java code
+else
+LOCAL_STATIC_JAVA_LIBRARIES += emma
+endif # LOCAL_JACK_ENABLED
+else
 ifdef LOCAL_SDK_VERSION
 ifdef TARGET_BUILD_APPS
 # In unbundled build, merge the coverage library into the apk.
+ifdef LOCAL_JACK_ENABLED
 # Jack supports coverage with Jacoco
+ifneq ($(LOCAL_SRC_FILES)$(LOCAL_STATIC_JAVA_LIBRARIES)$(LOCAL_SOURCE_FILES_ALL_GENERATED),)
+# Only add jacocoagent if the package contains some java code
 LOCAL_STATIC_JAVA_LIBRARIES += jacocoagent
 # Exclude jacoco classes from proguard
 LOCAL_PROGUARD_FLAGS += -include $(BUILD_SYSTEM)/proguard.jacoco.flags
 LOCAL_JACK_PROGUARD_FLAGS += -include $(BUILD_SYSTEM)/proguard.jacoco.flags
-else # ! TARGET_BUILD_APPS
+endif # Contains java code
+else  # ! LOCAL_JACK_ENABLED
+LOCAL_STATIC_JAVA_LIBRARIES += emma
+endif # ! LOCAL_JACK_ENABLED
+else  # ! TARGET_BUILD_APPS
+ifdef LOCAL_JACK_ENABLED
 # If build against the SDK in full build, core.jar is not used
 # so coverage classes are not present.
 # Jack needs jacoco on the classpath but we do not want it to be in
@@ -249,11 +264,16 @@
 # Note: we have nothing to do for proguard since jacoco will be
 # on the classpath only, thus not modified during the compilation.
 LOCAL_JAVA_LIBRARIES += jacocoagent
-endif # TARGET_BUILD_APPS
+else  # ! LOCAL_JACK_ENABLED
+# If build against the SDK in full build, core.jar is not used,
+# we have to use prebiult emma.jar to make Proguard happy;
+# Otherwise emma classes are included in core.jar.
+LOCAL_PROGUARD_FLAGS += -libraryjars $(EMMA_JAR)
+endif # ! LOCAL_JACK_ENABLED
+endif # ! TARGET_BUILD_APPS
 endif # LOCAL_SDK_VERSION
-endif # ! EMMA_INSTRUMENT_STATIC
+endif # EMMA_INSTRUMENT_STATIC
 endif # LOCAL_EMMA_INSTRUMENT
-endif # Contains java code
 
 rs_compatibility_jni_libs :=
 
@@ -374,13 +394,30 @@
 
 endif  # LOCAL_USE_AAPT2
 
-# Make sure to generate R.java before compiling.
 # Other modules should depend on the BUILT module if
 # they want to use this module's R.java file.
-$(LOCAL_BUILT_MODULE) \
-$(full_classes_compiled_jar) \
-$(built_dex_intermediate) $(noshrob_classes_jack) $(full_classes_jack) $(jack_check_timestamp) \
-  :  $(R_file_stamp)
+$(LOCAL_BUILT_MODULE): $(R_file_stamp)
+
+ifdef LOCAL_JACK_ENABLED
+ifneq ($(built_dex_intermediate),)
+$(built_dex_intermediate): $(R_file_stamp)
+endif
+ifneq ($(noshrob_classes_jack),)
+$(noshrob_classes_jack): $(R_file_stamp)
+endif
+ifneq ($(full_classes_jack),)
+$(full_classes_jack): $(R_file_stamp)
+$(jack_check_timestamp): $(R_file_stamp)
+endif
+endif # LOCAL_JACK_ENABLED
+
+ifneq ($(full_classes_jar),)
+# If full_classes_jar is non-empty, we're building sources.
+# If we're building sources, the initial javac step (which
+# produces full_classes_compiled_jar) needs to ensure the
+# R.java and Manifest.java files have been generated first.
+$(full_classes_compiled_jar): $(R_file_stamp)
+endif
 
 endif  # need_compile_res
 
@@ -426,9 +463,12 @@
 
 ifneq ($(full_classes_jar),)
 $(LOCAL_BUILT_MODULE): PRIVATE_DEX_FILE := $(built_dex)
+# Use the jarjar processed arhive as the initial package file.
+$(LOCAL_BUILT_MODULE): PRIVATE_SOURCE_ARCHIVE := $(full_classes_jarjar_jar)
 $(LOCAL_BUILT_MODULE): $(built_dex)
 else
 $(LOCAL_BUILT_MODULE): PRIVATE_DEX_FILE :=
+$(LOCAL_BUILT_MODULE): PRIVATE_SOURCE_ARCHIVE :=
 endif # full_classes_jar
 
 include $(BUILD_SYSTEM)/install_jni_libs.mk
@@ -487,6 +527,7 @@
     $(my_res_package) $(LOCAL_BUILT_MODULE): PRIVATE_PRODUCT_AAPT_PREF_CONFIG := $(PRODUCT_AAPT_PREF_CONFIG)
 endif
 endif
+$(LOCAL_BUILT_MODULE): PRIVATE_DONT_DELETE_JAR_DIRS := $(LOCAL_DONT_DELETE_JAR_DIRS)
 $(LOCAL_BUILT_MODULE) : $(jni_shared_libraries)
 ifdef LOCAL_USE_AAPT2
 $(LOCAL_BUILT_MODULE): PRIVATE_RES_PACKAGE := $(my_res_package)
@@ -498,7 +539,13 @@
 ifdef LOCAL_USE_AAPT2
 	$(call copy-file-to-new-target)
 else  # ! LOCAL_USE_AAPT2
+ifdef LOCAL_JACK_ENABLED
 	$(create-empty-package)
+else
+	$(if $(PRIVATE_SOURCE_ARCHIVE),\
+	  $(call initialize-package-file,$(PRIVATE_SOURCE_ARCHIVE),$@),\
+	  $(create-empty-package))
+endif
 	$(add-assets-to-package)
 endif  # LOCAL_USE_AAPT2
 ifneq ($(jni_shared_libraries),)
@@ -510,7 +557,9 @@
 else  # full_classes_jar
 	$(add-dex-to-package)
 endif  # full_classes_jar
+ifdef LOCAL_JACK_ENABLED
 	$(add-carried-jack-resources)
+endif
 ifdef LOCAL_DEX_PREOPT
 ifneq ($(BUILD_PLATFORM_ZIP),)
 	@# Keep a copy of apk with classes.dex unstripped
diff --git a/core/static_java_library.mk b/core/static_java_library.mk
index 258c5f8..eeef4ce 100644
--- a/core/static_java_library.mk
+++ b/core/static_java_library.mk
@@ -75,10 +75,12 @@
 
 LOCAL_PROGUARD_FLAGS := $(addprefix -include ,$(proguard_options_file)) $(LOCAL_PROGUARD_FLAGS)
 
+ifdef LOCAL_JACK_ENABLED
 ifndef LOCAL_JACK_PROGUARD_FLAGS
     LOCAL_JACK_PROGUARD_FLAGS := $(LOCAL_PROGUARD_FLAGS)
 endif
 LOCAL_JACK_PROGUARD_FLAGS := $(addprefix -include ,$(proguard_options_file)) $(LOCAL_JACK_PROGUARD_FLAGS)
+endif # LOCAL_JACK_ENABLED
 
 R_file_stamp := $(intermediates.COMMON)/src/R.stamp
 LOCAL_INTERMEDIATE_TARGETS += $(R_file_stamp)
@@ -164,10 +166,13 @@
 	$(hide) find $(PRIVATE_SOURCE_INTERMEDIATES_DIR) -name R.java | xargs cat > $@
 endif  # LOCAL_USE_AAPT2
 
-$(LOCAL_BUILT_MODULE) \
-$(full_classes_compiled_jar) \
-$(noshrob_classes_jack) $(full_classes_jack) $(jack_check_timestamp) \
-  : $(R_file_stamp)
+$(LOCAL_BUILT_MODULE): $(R_file_stamp)
+ifdef LOCAL_JACK_ENABLED
+$(noshrob_classes_jack): $(R_file_stamp)
+$(full_classes_jack): $(R_file_stamp)
+$(jack_check_timestamp): $(R_file_stamp)
+endif # LOCAL_JACK_ENABLED
+$(full_classes_compiled_jar): $(R_file_stamp)
 
 # Rule to build AAR, archive including classes.jar, resource, etc.
 built_aar := $(intermediates.COMMON)/javalib.aar