diff --git a/core/aapt2.mk b/core/aapt2.mk
index c582e30..7d9d8ce 100644
--- a/core/aapt2.mk
+++ b/core/aapt2.mk
@@ -12,6 +12,7 @@
 # - proguard_options_file
 # - my_generated_res_dirs: Resources generated during the build process and we have to compile them in a single run of aapt2.
 # - my_generated_res_dirs_deps: the dependency to use for my_generated_res_dirs.
+# - my_generated_res_zips: Zip files containing resources
 # - my_apk_split_configs: The configurations for which to generate splits.
 # - built_apk_splits: The paths where AAPT should generate the splits.
 #
@@ -35,7 +36,7 @@
     $(eval $(call aapt2-compile-one-resource-file-rule,$(r),$(o)))\
     $(o))
 
-my_generated_resources_flata :=
+my_resources_flata :=
 # Compile generated resources
 ifneq ($(my_generated_res_dirs),)
 my_generated_resources_flata := $(my_compiled_res_base_dir)/gen_res.flata
@@ -44,12 +45,23 @@
 	@echo "AAPT2 compile $@ <- $(PRIVATE_SOURCE_RES_DIRS)"
 	$(call aapt2-compile-resource-dirs)
 
-my_generated_resources_flata += $(my_generated_resources_flata)
+my_resources_flata += $(my_generated_resources_flata)
+endif
+
+# Compile zipped resources
+ifneq ($(my_generated_res_zips),)
+my_zipped_resources_flata := $(my_compiled_res_base_dir)/zip_res.flata
+$(my_zipped_resources_flata): PRIVATE_SOURCE_RES_ZIPS := $(my_generated_res_zips)
+$(my_zipped_resources_flata) : $(my_generated_res_deps) $(AAPT2) $(ZIPSYNC)
+	@echo "AAPT2 compile $@ <- $(PRIVATE_SOURCE_RES_ZIPS)"
+	$(call aapt2-compile-resource-zips)
+
+my_resources_flata += $(my_zipped_resources_flata)
 endif
 
 # Always set --pseudo-localize, it will be stripped out later for release
 # builds that don't want it.
-$(my_res_resources_flat) $(my_overlay_resources_flat) $(my_generated_resources_flata): \
+$(my_res_resources_flat) $(my_overlay_resources_flat) $(my_resources_flata): \
   PRIVATE_AAPT2_CFLAGS := --pseudo-localize
 
 my_static_library_resources := $(foreach l, $(call reverse-list,$(LOCAL_STATIC_ANDROID_LIBRARIES)),\
@@ -67,7 +79,7 @@
 endif
 
 $(my_res_package): PRIVATE_RES_FLAT := $(my_res_resources_flat)
-$(my_res_package): PRIVATE_OVERLAY_FLAT := $(my_static_library_resources) $(my_generated_resources_flata) $(my_overlay_resources_flat)
+$(my_res_package): PRIVATE_OVERLAY_FLAT := $(my_static_library_resources) $(my_resources_flata) $(my_overlay_resources_flat)
 $(my_res_package): PRIVATE_SHARED_ANDROID_LIBRARIES := $(my_shared_library_resources)
 $(my_res_package): PRIVATE_PROGUARD_OPTIONS_FILE := $(proguard_options_file)
 $(my_res_package): PRIVATE_ASSET_DIRS := $(my_asset_dirs)
@@ -95,7 +107,7 @@
 $(my_res_package): $(full_android_manifest) $(my_static_library_resources) $(my_shared_library_resources)
 $(my_res_package): $(my_full_asset_paths)
 $(my_res_package): $(my_res_resources_flat) $(my_overlay_resources_flat) \
-  $(my_generated_resources_flata) $(my_static_library_resources) \
+  $(my_resources_flata) $(my_static_library_resources) \
   $(AAPT2)
 	@echo "AAPT2 link $@"
 	$(call aapt2-link)
@@ -118,3 +130,4 @@
 my_apk_split_configs :=
 my_generated_res_dirs :=
 my_generated_res_dirs_deps :=
+my_generated_res_zips :=
diff --git a/core/aapt_flags.mk b/core/aapt_flags.mk
new file mode 100644
index 0000000..4e3493a
--- /dev/null
+++ b/core/aapt_flags.mk
@@ -0,0 +1,20 @@
+## AAPT Flags
+# aapt doesn't accept multiple --extra-packages flags.
+# We have to collapse them into a single --extra-packages flag here.
+LOCAL_AAPT_FLAGS := $(strip $(LOCAL_AAPT_FLAGS))
+ifdef LOCAL_AAPT_FLAGS
+  ifeq ($(filter 0 1,$(words $(filter --extra-packages,$(LOCAL_AAPT_FLAGS)))),)
+    aapt_flags := $(subst --extra-packages$(space),--extra-packages@,$(LOCAL_AAPT_FLAGS))
+    aapt_flags_extra_packages := $(patsubst --extra-packages@%,%,$(filter --extra-packages@%,$(aapt_flags)))
+    aapt_flags_extra_packages := $(sort $(subst :,$(space),$(aapt_flags_extra_packages)))
+    LOCAL_AAPT_FLAGS := $(filter-out --extra-packages@%,$(aapt_flags)) \
+        --extra-packages $(subst $(space),:,$(aapt_flags_extra_packages))
+    aapt_flags_extra_packages :=
+    aapt_flags :=
+  endif
+endif
+
+$(LOCAL_INTERMEDIATE_TARGETS): PRIVATE_AAPT_FLAGS := $(LOCAL_AAPT_FLAGS)
+$(LOCAL_INTERMEDIATE_TARGETS): PRIVATE_TARGET_AAPT_CHARACTERISTICS := $(TARGET_AAPT_CHARACTERISTICS)
+$(LOCAL_INTERMEDIATE_TARGETS): PRIVATE_MANIFEST_PACKAGE_NAME := $(LOCAL_MANIFEST_PACKAGE_NAME)
+$(LOCAL_INTERMEDIATE_TARGETS): PRIVATE_MANIFEST_INSTRUMENTATION_FOR := $(LOCAL_MANIFEST_INSTRUMENTATION_FOR)
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index 270a140..0c94ac3 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -130,7 +130,6 @@
 LOCAL_JAR_PROCESSOR:=
 LOCAL_JAR_PROCESSOR_ARGS:=
 LOCAL_JAVACFLAGS:=
-LOCAL_JAVAC_SHARD_SIZE:=
 LOCAL_JAVA_LANGUAGE_VERSION:=
 LOCAL_JAVA_LAYERS_FILE:=
 LOCAL_JAVA_LIBRARIES:=
diff --git a/core/definitions.mk b/core/definitions.mk
index 1fb03ff..e6bd194 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -2079,6 +2079,13 @@
   $(PRIVATE_AAPT2_CFLAGS) --legacy
 endef
 
+# TODO(b/74574557): use aapt2 compile --zip if it gets implemented
+define aapt2-compile-resource-zips
+@mkdir -p $(dir $@)
+$(ZIPSYNC) -d $@.contents -l $@.list $(PRIVATE_SOURCE_RES_ZIPS)
+$(hide) $(AAPT2) compile -o $@ --dir $@.tmp $(PRIVATE_AAPT2_CFLAGS) --legacy
+endef
+
 # Set up rule to compile one resource file with aapt2.
 # Must be called with $(eval).
 # $(1): the source file
@@ -2222,16 +2229,6 @@
 $(hide) tr ' ' '\n' < $@.tmp | $(NORMALIZE_PATH) | sort -u > $@
 endef
 
-# $(1): sharding number.
-# $(2): Java source files paths.
-define save-sharded-java-source-list
-$(java_source_list_file).shard.$(1): $(2) $$(NORMALIZE_PATH)
-	@echo "shard java source list: $$@"
-	rm -f $$@
-	$$(call dump-words-to-file,$(2),$$@.tmp)
-	$(hide) tr ' ' '\n' < $$@.tmp | $$(NORMALIZE_PATH) | sort -u > $$@
-endef
-
 # Common definition to invoke javac on the host and target.
 #
 # $(1): javac
@@ -2241,7 +2238,9 @@
 $(hide) rm -rf $(PRIVATE_CLASS_INTERMEDIATES_DIR) $(PRIVATE_ANNO_INTERMEDIATES_DIR)
 $(hide) mkdir -p $(dir $@)
 $(hide) mkdir -p $(PRIVATE_CLASS_INTERMEDIATES_DIR) $(PRIVATE_ANNO_INTERMEDIATES_DIR)
-$(hide) if [ -s $(PRIVATE_JAVA_SOURCE_LIST) ] ; then \
+$(if $(PRIVATE_SRCJARS),\
+    $(ZIPSYNC) -d $(PRIVATE_SRCJAR_INTERMEDIATES_DIR) -l $(PRIVATE_SRCJAR_LIST_FILE) -f "*.java" $(PRIVATE_SRCJARS))
+$(hide) if [ -s $(PRIVATE_JAVA_SOURCE_LIST) $(if $(PRIVATE_SRCJARS),-o -s $(PRIVATE_SRCJAR_LIST_FILE) )] ; then \
     $(SOONG_JAVAC_WRAPPER) $(JAVAC_WRAPPER) $(1) -encoding UTF-8 \
     $(if $(findstring true,$(PRIVATE_WARNINGS_ENABLE)),$(xlint_unchecked),) \
     $(if $(PRIVATE_USE_SYSTEM_MODULES), \
@@ -2260,6 +2259,7 @@
     -d $(PRIVATE_CLASS_INTERMEDIATES_DIR) -s $(PRIVATE_ANNO_INTERMEDIATES_DIR) \
     $(PRIVATE_JAVACFLAGS) \
     \@$(PRIVATE_JAVA_SOURCE_LIST) \
+    $(if $(PRIVATE_SRCJARS),\@$(PRIVATE_SRCJAR_LIST_FILE)) \
     || ( rm -rf $(PRIVATE_CLASS_INTERMEDIATES_DIR) ; exit 41 ) \
 fi
 $(if $(PRIVATE_JAVA_LAYERS_FILE), $(hide) build/make/tools/java-layers.py \
@@ -2280,45 +2280,15 @@
 $(if $(PRIVATE_EXTRA_JAR_ARGS),$(call add-java-resources-to,$@))
 endef
 
-# $(1): Javac output jar name.
-# $(2): Java source list file.
-# $(3): Java header libs.
-# $(4): Javac sharding number.
-# $(5): Javac sources deps (the arg may neeed $$ in case of containing '#')
-define create-classes-full-debug.jar
-$(1): PRIVATE_JAVACFLAGS := $$(LOCAL_JAVACFLAGS) $$(annotation_processor_flags)
-$(1): PRIVATE_JAR_EXCLUDE_FILES := $$(LOCAL_JAR_EXCLUDE_FILES)
-$(1): PRIVATE_JAR_PACKAGES := $$(LOCAL_JAR_PACKAGES)
-$(1): PRIVATE_JAR_EXCLUDE_PACKAGES := $$(LOCAL_JAR_EXCLUDE_PACKAGES)
-$(1): PRIVATE_DONT_DELETE_JAR_META_INF := $$(LOCAL_DONT_DELETE_JAR_META_INF)
-$(1): PRIVATE_JAVA_SOURCE_LIST := $(2)
-$(1): PRIVATE_ALL_JAVA_HEADER_LIBRARIES := $(3)
-$(1): PRIVATE_CLASS_INTERMEDIATES_DIR := $(intermediates.COMMON)/classes$(4)
-$(1): PRIVATE_ANNO_INTERMEDIATES_DIR := $(intermediates.COMMON)/anno$(4)
-$(1): \
-    $(2) \
-    $(3) \
-    $(5) \
-    $$(full_java_bootclasspath_libs) \
-    $$(full_java_system_modules_deps) \
-    $$(layers_file) \
-    $$(annotation_processor_deps) \
-    $$(NORMALIZE_PATH) \
-    $$(JAR_ARGS) \
-    | $$(SOONG_JAVAC_WRAPPER)
-	@echo "Target Java: $$@ ($$(PRIVATE_CLASS_INTERMEDIATES_DIR))"
-	$$(call compile-java,$$(TARGET_JAVAC),$$(PRIVATE_ALL_JAVA_HEADER_LIBRARIES))
-endef
-
 define transform-java-to-header.jar
 @echo "$($(PRIVATE_PREFIX)DISPLAY) Turbine: $(PRIVATE_MODULE)"
 @mkdir -p $(dir $@)
 @rm -rf $(dir $@)/classes-turbine
 @mkdir $(dir $@)/classes-turbine
-$(hide) if [ -s $(PRIVATE_JAVA_SOURCE_LIST) ] ; then \
+$(hide) if [ -s $(PRIVATE_JAVA_SOURCE_LIST) -o -n "$(PRIVATE_SRCJARS)" ] ; then \
     $(JAVA) -jar $(TURBINE) \
     --output $@.premerged --temp_dir $(dir $@)/classes-turbine \
-    --sources \@$(PRIVATE_JAVA_SOURCE_LIST) \
+    --sources \@$(PRIVATE_JAVA_SOURCE_LIST) --source_jars $(PRIVATE_SRCJARS) \
     --javacopts $(PRIVATE_JAVACFLAGS) $(COMMON_JDK_FLAGS) \
     $(addprefix --bootclasspath ,$(strip \
          $(call normalize-path-list,$(PRIVATE_BOOTCLASSPATH)) \
diff --git a/core/droiddoc.mk b/core/droiddoc.mk
index 8115481..b174f31 100644
--- a/core/droiddoc.mk
+++ b/core/droiddoc.mk
@@ -189,15 +189,15 @@
         $(droiddoc) \
         $(html_dir_files) \
         $(full_java_libs) \
-        $(EXTRACT_SRCJARS) \
+        $(ZIPSYNC) \
         $(LOCAL_SRCJARS) \
         $(LOCAL_ADDITIONAL_DEPENDENCIES)
 	@echo Docs droiddoc: $(PRIVATE_OUT_DIR)
 	$(hide) mkdir -p $(dir $@)
-	$(hide) rm -rf $(PRIVATE_STUB_OUT_DIR) $(PRIVATE_SRCJAR_INTERMEDIATES_DIR)
+	$(hide) rm -rf $(PRIVATE_STUB_OUT_DIR)
 	$(call prepare-doc-source-list,$(PRIVATE_SRC_LIST_FILE),$(PRIVATE_JAVA_FILES), \
 			$(PRIVATE_SOURCE_INTERMEDIATES_DIR) $(PRIVATE_ADDITIONAL_JAVA_DIR))
-	$(EXTRACT_SRCJARS) $(PRIVATE_SRCJAR_INTERMEDIATES_DIR) $(PRIVATE_SRCJAR_LIST_FILE) $(PRIVATE_SRCJARS)
+	$(ZIPSYNC) -d $(PRIVATE_SRCJAR_INTERMEDIATES_DIR) -l $(PRIVATE_SRCJAR_LIST_FILE) -f "*.java" $(PRIVATE_SRCJARS)
 	$(hide) ( \
 		$(JAVADOC) \
                 -encoding UTF-8 \
@@ -243,13 +243,12 @@
 # For OpenJDK 8 we can use -bootclasspath to define the core libraries code.
 $(full_target): PRIVATE_BOOTCLASSPATH_ARG := $(addprefix -bootclasspath ,$(PRIVATE_BOOTCLASSPATH))
 endif
-$(full_target): $(full_src_files) $(LOCAL_GENERATED_SOURCES) $(full_java_libs) $(EXTRACT_SRCJARS) $(LOCAL_SRCJARS) $(LOCAL_ADDITIONAL_DEPENDENCIES)
+$(full_target): $(full_src_files) $(LOCAL_GENERATED_SOURCES) $(full_java_libs) $(ZIPSYNC) $(LOCAL_SRCJARS) $(LOCAL_ADDITIONAL_DEPENDENCIES)
 	@echo Docs javadoc: $(PRIVATE_OUT_DIR)
 	@mkdir -p $(dir $@)
-	rm -rf $(PRIVATE_SRCJAR_INTERMEDIATES_DIR)
 	$(call prepare-doc-source-list,$(PRIVATE_SRC_LIST_FILE),$(PRIVATE_JAVA_FILES), \
 			$(PRIVATE_SOURCE_INTERMEDIATES_DIR) $(PRIVATE_ADDITIONAL_JAVA_DIR))
-	$(EXTRACT_SRCJARS) $(PRIVATE_SRCJAR_INTERMEDIATES_DIR) $(PRIVATE_SRCJAR_LIST_FILE) $(PRIVATE_SRCJARS)
+	$(ZIPSYNC) -d $(PRIVATE_SRCJAR_INTERMEDIATES_DIR) -l $(PRIVATE_SRCJAR_LIST_FILE) -f "*.java" $(PRIVATE_SRCJARS)
 	$(hide) ( \
 		$(JAVADOC) \
                 -encoding UTF-8 \
diff --git a/core/host_dalvik_java_library.mk b/core/host_dalvik_java_library.mk
index 20663d1..1ef0ccb 100644
--- a/core/host_dalvik_java_library.mk
+++ b/core/host_dalvik_java_library.mk
@@ -76,6 +76,7 @@
     $(java_sources) \
     $(java_resource_sources) \
     $(proto_java_sources_file_stamp) \
+    $(LOCAL_SRCJARS) \
     $(LOCAL_ADDITIONAL_DEPENDENCIES)
 
 $(java_source_list_file): $(java_sources_deps)
@@ -86,6 +87,9 @@
 $(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): PRIVATE_SRCJARS := $(LOCAL_SRCJARS)
+$(full_classes_compiled_jar): PRIVATE_SRCJAR_LIST_FILE := $(intermediates.COMMON)/srcjar-list
+$(full_classes_compiled_jar): PRIVATE_SRCJAR_INTERMEDIATES_DIR := $(intermediates.COMMON)/srcjars
 $(full_classes_compiled_jar): \
     $(java_source_list_file) \
     $(java_sources_deps) \
@@ -95,6 +99,7 @@
     $(annotation_processor_deps) \
     $(NORMALIZE_PATH) \
     $(JAR_ARGS) \
+    $(ZIPSYNC) \
     | $(SOONG_JAVAC_WRAPPER)
 	$(transform-host-java-to-dalvik-package)
 
@@ -102,6 +107,7 @@
 
 $(full_classes_turbine_jar): PRIVATE_JAVACFLAGS := $(LOCAL_JAVACFLAGS) $(annotation_processor_flags)
 $(full_classes_turbine_jar): PRIVATE_DONT_DELETE_JAR_META_INF := $(LOCAL_DONT_DELETE_JAR_META_INF)
+$(full_classes_turbine_jar): PRIVATE_SRCJARS := $(LOCAL_SRCJARS)
 $(full_classes_turbine_jar): \
     $(java_source_list_file) \
     $(java_sources_deps) \
diff --git a/core/host_java_library.mk b/core/host_java_library.mk
index 47404c8..32295ab 100644
--- a/core/host_java_library.mk
+++ b/core/host_java_library.mk
@@ -63,6 +63,7 @@
     $(java_sources) \
     $(java_resource_sources) \
     $(proto_java_sources_file_stamp) \
+    $(LOCAL_SRCJARS) \
     $(LOCAL_ADDITIONAL_DEPENDENCIES)
 
 $(java_source_list_file): $(java_sources_deps)
@@ -73,6 +74,9 @@
 $(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): PRIVATE_SRCJARS := $(LOCAL_SRCJARS)
+$(full_classes_compiled_jar): PRIVATE_SRCJAR_LIST_FILE := $(intermediates.COMMON)/srcjar-list
+$(full_classes_compiled_jar): PRIVATE_SRCJAR_INTERMEDIATES_DIR := $(intermediates.COMMON)/srcjars
 $(full_classes_compiled_jar): \
     $(java_source_list_file) \
     $(java_sources_deps) \
@@ -82,6 +86,7 @@
     $(NORMALIZE_PATH) \
     $(ZIPTIME) \
     $(JAR_ARGS) \
+    $(ZIPSYNC) \
     | $(SOONG_JAVAC_WRAPPER)
 	$(transform-host-java-to-package)
 	$(remove-timestamps-from-package)
diff --git a/core/java.mk b/core/java.mk
index ebb86af..019a989 100644
--- a/core/java.mk
+++ b/core/java.mk
@@ -104,9 +104,8 @@
 
 ###############################################################
 ## .rs files: RenderScript sources to .java files and .bc files
-## .fs files: Filterscript sources to .java files and .bc files
 ###############################################################
-renderscript_sources := $(filter %.rs %.fs,$(LOCAL_SRC_FILES))
+renderscript_sources := $(filter %.rs,$(LOCAL_SRC_FILES))
 # Because names of the java files from RenderScript are unknown until the
 # .rs file(s) are compiled, we have to depend on a timestamp file.
 RenderScript_file_stamp :=
@@ -167,7 +166,7 @@
 LOCAL_RENDERSCRIPT_INCLUDES := $(LOCAL_RENDERSCRIPT_INCLUDES_OVERRIDE)
 endif
 
-bc_files := $(patsubst %.fs,%.bc, $(patsubst %.rs,%.bc, $(notdir $(renderscript_sources))))
+bc_files := $(patsubst %.rs,%.bc, $(notdir $(renderscript_sources)))
 bc_dep_files := $(addprefix $(renderscript_intermediate.COMMON)/,$(patsubst %.bc,%.d,$(bc_files)))
 
 $(RenderScript_file_stamp): PRIVATE_RS_INCLUDES := $(LOCAL_RENDERSCRIPT_INCLUDES)
@@ -327,34 +326,6 @@
 java_intermediate_sources := $(addprefix $(TARGET_OUT_COMMON_INTERMEDIATES)/, $(filter %.java,$(LOCAL_INTERMEDIATE_SOURCES)))
 all_java_sources := $(java_sources) $(java_intermediate_sources)
 
-enable_sharding :=
-ifneq ($(TURBINE_ENABLED),false)
-ifneq ($(LOCAL_JAVAC_SHARD_SIZE),)
-ifneq ($(LOCAL_JAR_PROCESSOR),)
-$(call pretty-error,Cannot set both LOCAL_JAVAC_SHARD_SIZE and LOCAL_JAR_PROCESSOR!)
-endif # LOCAL_JAR_PROCESSOR is not empty
-enable_sharding := true
-
-num_shards := $(call int_divide,$(words $(java_sources)),$(LOCAL_JAVAC_SHARD_SIZE))
-ifneq ($(words $(java_sources)),$(call int_multiply,$(LOCAL_JAVAC_SHARD_SIZE),$(num_shards)))
-# increment number of shards by 1.
-num_shards := $(call int_plus,$(num_shards),1)
-endif
-
-shard_idx_list := $(call int_range_list,1,$(num_shards))
-sharded_java_source_list_files += $(foreach x,$(shard_idx_list),$(java_source_list_file).shard.$(x))
-sharded_jar_list += $(foreach x,$(shard_idx_list),$(full_classes_compiled_jar).shard.$(x))
-
-# always put dynamically-located .java files (generated by Proto/resource, etc) in a new final shard.
-# increment number of shards by 1.
-num_shards := $(call int_plus,$(num_shards),1)
-sharded_java_source_list_files += $(java_source_list_file).shard.$(num_shards)
-sharded_jar_list += $(full_classes_compiled_jar).shard.$(num_shards)
-LOCAL_INTERMEDIATE_TARGETS += $(sharded_java_source_list_files)
-LOCAL_INTERMEDIATE_TARGETS += $(sharded_jar_list)
-endif # LOCAL_JAVAC_SHARD_SIZE is not empty
-endif # TURBINE_ENABLED != false
-
 include $(BUILD_SYSTEM)/java_common.mk
 
 include $(BUILD_SYSTEM)/sdk_check.mk
@@ -430,56 +401,16 @@
     $(java_resource_sources) \
     $(RenderScript_file_stamp) \
     $(proto_java_sources_file_stamp) \
+    $(LOCAL_SRCJARS) \
     $(LOCAL_ADDITIONAL_DEPENDENCIES)
 
 $(java_source_list_file): $(java_sources_deps)
 	$(write-java-source-list)
 
-ifdef enable_sharding
-$(foreach x,$(shard_idx_list),\
-  $(eval $(call save-sharded-java-source-list,$(x),\
-    $(wordlist $(call int_plus,1,$(call int_multiply,$(LOCAL_JAVAC_SHARD_SIZE),$(call int_subtract,$(x),1))),\
-      $(call int_multiply,$(LOCAL_JAVAC_SHARD_SIZE),$(x)),$(sort $(java_sources))))))
-
-# always put dynamically-located .java files (generated by Proto/resource, etc) in a new final shard.
-$(java_source_list_file).shard.$(num_shards): PRIVATE_JAVA_INTERMEDIATE_SOURCES := $(java_intermediate_sources)
-$(java_source_list_file).shard.$(num_shards): $(java_resource_sources) \
-    $(RenderScript_file_stamp) \
-    $(proto_java_sources_file_stamp) \
-    $(LOCAL_ADDITIONAL_DEPENDENCIES) \
-    $(NORMALIZE_PATH)
-	$(hide) rm -f $@
-	$(call dump-words-to-file,$(PRIVATE_JAVA_INTERMEDIATE_SOURCES),$@.tmp)
-	$(call fetch-additional-java-source,$@.tmp)
-	$(hide) tr ' ' '\n' < $@.tmp | $(NORMALIZE_PATH) | sort -u > $@
-
-# Javac sharding with header libs including its own header jar as one of dependency.
-$(foreach x,$(shard_idx_list),\
-  $(eval $(call create-classes-full-debug.jar,$(full_classes_compiled_jar).shard.$(x),\
-    $(java_source_list_file).shard.$(x),\
-      $(full_java_header_libs) $(full_classes_header_jar),$(x),\
-        $(wordlist $(call int_plus,1,$(call int_multiply,$(LOCAL_JAVAC_SHARD_SIZE),$(call int_subtract,$(x),1))),\
-          $(call int_multiply,$(LOCAL_JAVAC_SHARD_SIZE),$(x)),$(sort $(java_sources))))))
-
-# Javac sharding for last shard with additional Java dependencies.
-$(eval $(call create-classes-full-debug.jar,$(full_classes_compiled_jar).shard.$(num_shards),\
-  $(java_source_list_file).shard.$(num_shards),$(full_java_header_libs) $(full_classes_header_jar),$(strip \
-    $(num_shards)),$$(java_resource_sources) $$(RenderScript_file_stamp) \
-      $$(proto_java_sources_file_stamp) $$(LOCAL_ADDITIONAL_DEPENDENCIES)))
-
-$(full_classes_compiled_jar): PRIVATE_SHARDED_JAR_LIST := $(sharded_jar_list)
-$(full_classes_compiled_jar): $(sharded_jar_list) | $(MERGE_ZIPS)
-	$(MERGE_ZIPS) -j $@ $(PRIVATE_SHARDED_JAR_LIST)
-else
-# we can't use single $ for java_sources_deps since it may contain hash '#' sign.
-$(eval $(call create-classes-full-debug.jar,$(full_classes_compiled_jar),\
-  $(java_source_list_file),$(full_java_header_libs),,$$(java_sources_deps)))
-
-endif # ifdef enable_sharding
-
 ifneq ($(TURBINE_ENABLED),false)
 
 $(full_classes_turbine_jar): PRIVATE_JAVACFLAGS := $(LOCAL_JAVACFLAGS) $(annotation_processor_flags)
+$(full_classes_turbine_jar): PRIVATE_SRCJARS := $(LOCAL_SRCJARS)
 $(full_classes_turbine_jar): PRIVATE_DONT_DELETE_JAR_META_INF := $(LOCAL_DONT_DELETE_JAR_META_INF)
 $(full_classes_turbine_jar): \
     $(java_source_list_file) \
@@ -510,6 +441,31 @@
 
 endif # TURBINE_ENABLED != false
 
+$(full_classes_compiled_jar): PRIVATE_JAVACFLAGS := $(LOCAL_JAVACFLAGS) $(annotation_processor_flags)
+$(full_classes_compiled_jar): PRIVATE_JAR_EXCLUDE_FILES := $(LOCAL_JAR_EXCLUDE_FILES)
+$(full_classes_compiled_jar): PRIVATE_JAR_PACKAGES := $(LOCAL_JAR_PACKAGES)
+$(full_classes_compiled_jar): PRIVATE_JAR_EXCLUDE_PACKAGES := $(LOCAL_JAR_EXCLUDE_PACKAGES)
+$(full_classes_compiled_jar): PRIVATE_DONT_DELETE_JAR_META_INF := $(LOCAL_DONT_DELETE_JAR_META_INF)
+$(full_classes_compiled_jar): PRIVATE_JAVA_SOURCE_LIST := $(java_source_list_file)
+$(full_classes_compiled_jar): PRIVATE_ALL_JAVA_HEADER_LIBRARIES := $(full_java_header_libs)
+$(full_classes_compiled_jar): PRIVATE_SRCJARS := $(LOCAL_SRCJARS)
+$(full_classes_compiled_jar): PRIVATE_SRCJAR_LIST_FILE := $(intermediates.COMMON)/srcjar-list
+$(full_classes_compiled_jar): PRIVATE_SRCJAR_INTERMEDIATES_DIR := $(intermediates.COMMON)/srcjars
+$(full_classes_compiled_jar): \
+    $(java_source_list_file) \
+    $(full_java_header_libs) \
+    $(java_sources_deps) \
+    $(full_java_bootclasspath_libs) \
+    $(full_java_system_modules_deps) \
+    $(layers_file) \
+    $(annotation_processor_deps) \
+    $(NORMALIZE_PATH) \
+    $(JAR_ARGS) \
+    $(ZIPSYNC) \
+    | $(SOONG_JAVAC_WRAPPER)
+	@echo "Target Java: $@
+	$(call compile-java,$(TARGET_JAVAC),$(PRIVATE_ALL_JAVA_HEADER_LIBRARIES))
+
 javac-check : $(full_classes_compiled_jar)
 javac-check-$(LOCAL_MODULE) : $(full_classes_compiled_jar)
 
diff --git a/core/java_common.mk b/core/java_common.mk
index c97653b..4b10d2d 100644
--- a/core/java_common.mk
+++ b/core/java_common.mk
@@ -177,7 +177,7 @@
 #####################################
 ## Warn if there is unrecognized file in LOCAL_SRC_FILES.
 my_unknown_src_files := $(filter-out \
-  %.java %.aidl %.proto %.logtags %.fs %.rs, \
+  %.java %.aidl %.proto %.logtags %.rs, \
   $(LOCAL_SRC_FILES) $(LOCAL_INTERMEDIATE_SOURCES) $(LOCAL_GENERATED_SOURCES))
 ifneq ($(my_unknown_src_files),)
 $(warning $(LOCAL_MODULE_MAKEFILE): $(LOCAL_MODULE): Unused source files: $(my_unknown_src_files))
@@ -188,7 +188,7 @@
 # LOCAL_SOURCE_FILES_ALL_GENERATED is set only if the module does not have static source files,
 # but generated source files in its LOCAL_INTERMEDIATE_SOURCE_DIR.
 # You have to set up the dependency in some other way.
-need_compile_java := $(strip $(all_java_sources)$(all_res_assets)$(java_resource_sources))$(LOCAL_STATIC_JAVA_LIBRARIES)$(filter true,$(LOCAL_SOURCE_FILES_ALL_GENERATED))
+need_compile_java := $(strip $(all_java_sources)$(LOCAL_SRCJARS)$(all_res_assets)$(java_resource_sources))$(LOCAL_STATIC_JAVA_LIBRARIES)$(filter true,$(LOCAL_SOURCE_FILES_ALL_GENERATED))
 ifdef need_compile_java
 
 annotation_processor_flags :=
@@ -411,35 +411,6 @@
 endif
 
 ##########################################################
-ifndef LOCAL_IS_HOST_MODULE
-## AAPT Flags
-# aapt doesn't accept multiple --extra-packages flags.
-# We have to collapse them into a single --extra-packages flag here.
-LOCAL_AAPT_FLAGS := $(strip $(LOCAL_AAPT_FLAGS))
-ifdef LOCAL_AAPT_FLAGS
-ifeq ($(filter 0 1,$(words $(filter --extra-packages,$(LOCAL_AAPT_FLAGS)))),)
-aapt_flags := $(subst --extra-packages$(space),--extra-packages@,$(LOCAL_AAPT_FLAGS))
-aapt_flags_extra_packages := $(patsubst --extra-packages@%,%,$(filter --extra-packages@%,$(aapt_flags)))
-aapt_flags_extra_packages := $(sort $(subst :,$(space),$(aapt_flags_extra_packages)))
-LOCAL_AAPT_FLAGS := $(filter-out --extra-packages@%,$(aapt_flags)) \
-    --extra-packages $(subst $(space),:,$(aapt_flags_extra_packages))
-aapt_flags_extra_packages :=
-aapt_flags :=
-endif
-endif
-
-$(LOCAL_INTERMEDIATE_TARGETS): PRIVATE_AAPT_FLAGS := $(LOCAL_AAPT_FLAGS) $(PRODUCT_AAPT_FLAGS)
-$(LOCAL_INTERMEDIATE_TARGETS): PRIVATE_TARGET_AAPT_CHARACTERISTICS := $(TARGET_AAPT_CHARACTERISTICS)
-$(LOCAL_INTERMEDIATE_TARGETS): PRIVATE_MANIFEST_PACKAGE_NAME := $(LOCAL_MANIFEST_PACKAGE_NAME)
-$(LOCAL_INTERMEDIATE_TARGETS): PRIVATE_MANIFEST_INSTRUMENTATION_FOR := $(LOCAL_MANIFEST_INSTRUMENTATION_FOR)
-
-ifdef aidl_sources
-ALL_MODULES.$(my_register_name).AIDL_FILES := $(aidl_sources)
-endif
-ifdef renderscript_sources
-ALL_MODULES.$(my_register_name).RS_FILES := $(renderscript_sources_fullpath)
-endif
-endif  # !LOCAL_IS_HOST_MODULE
 
 full_java_libs := $(full_shared_java_libs) $(full_static_java_libs) $(LOCAL_CLASSPATH)
 full_java_header_libs := $(full_shared_java_header_libs) $(full_static_java_header_libs)
diff --git a/core/package_internal.mk b/core/package_internal.mk
index e25fd99..f9ed4ef 100644
--- a/core/package_internal.mk
+++ b/core/package_internal.mk
@@ -274,7 +274,7 @@
 
 ifeq (true,$(LOCAL_EMMA_INSTRUMENT))
 ifeq (true,$(EMMA_INSTRUMENT_STATIC))
-ifneq ($(LOCAL_SRC_FILES)$(LOCAL_STATIC_JAVA_LIBRARIES)$(LOCAL_SOURCE_FILES_ALL_GENERATED),)
+ifneq ($(LOCAL_SRC_FILES)$(LOCAL_SRCJARS)$(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
@@ -364,12 +364,13 @@
 # Make sure the data-binding process happens before javac and generation of R.java.
 $(R_file_stamp): $(data_binding_stamp)
 $(java_source_list_file): $(data_binding_stamp)
-$(foreach x,$(sharded_java_source_list_files),$(eval $(x): $(data_binding_stamp)))
 $(full_classes_compiled_jar): $(data_binding_stamp)
 endif  # LOCAL_DATA_BINDING
 
 resource_export_package :=
 
+include $(BUILD_SYSTEM)/aapt_flags.mk
+
 ifeq ($(need_compile_res),true)
 
 ###############################
@@ -468,12 +469,10 @@
 # The R.java file must exist by the time the java source
 # list is generated
 $(java_source_list_file): $(R_file_stamp)
-$(foreach x,$(sharded_java_source_list_files),$(eval $(x): $(R_file_stamp)))
 
 endif  # need_compile_res
 
 framework_res_package_export :=
-framework_res_package_export_deps :=
 
 ifneq ($(LOCAL_NO_STANDARD_LIBRARIES),true)
 # Most packages should link against the resources defined by framework-res.
@@ -485,15 +484,9 @@
 # for released sdk versions, the platform resources were built into android.jar.
 framework_res_package_export := \
     $(HISTORICAL_SDK_VERSIONS_ROOT)/$(LOCAL_SDK_RES_VERSION)/android.jar
-framework_res_package_export_deps := $(framework_res_package_export)
 else # LOCAL_SDK_RES_VERSION
 framework_res_package_export := \
     $(call intermediates-dir-for,APPS,framework-res,,COMMON)/package-export.apk
-# We can't depend directly on the export.apk file; it won't get its
-# PRIVATE_ vars set up correctly if we do.  Instead, depend on the
-# corresponding R.stamp file, which lists the export.apk as a dependency.
-framework_res_package_export_deps := \
-    $(dir $(framework_res_package_export))src/R.stamp
 endif # LOCAL_SDK_RES_VERSION
 endif # LOCAL_NO_STANDARD_LIBRARIES
 
@@ -503,7 +496,7 @@
         $(call intermediates-dir-for,APPS,$(lib),,COMMON)/package-export.apk)
 
 all_library_res_package_export_deps := \
-    $(framework_res_package_export_deps) \
+    $(framework_res_package_export) \
     $(foreach lib,$(LOCAL_RES_LIBRARIES),\
         $(call intermediates-dir-for,APPS,$(lib),,COMMON)/src/R.stamp)
 $(resource_export_package) $(R_file_stamp) $(LOCAL_BUILT_MODULE): $(all_library_res_package_export_deps)
diff --git a/core/prebuilt_internal.mk b/core/prebuilt_internal.mk
index d4f5522..96e2613 100644
--- a/core/prebuilt_internal.mk
+++ b/core/prebuilt_internal.mk
@@ -615,18 +615,14 @@
 endif
 
 framework_res_package_export :=
-framework_res_package_export_deps :=
 # Please refer to package.mk
 ifneq ($(LOCAL_NO_STANDARD_LIBRARIES),true)
 ifneq ($(filter-out current system_current test_current,$(LOCAL_SDK_RES_VERSION))$(if $(TARGET_BUILD_APPS),$(filter current system_current test_current,$(LOCAL_SDK_RES_VERSION))),)
 framework_res_package_export := \
     $(HISTORICAL_SDK_VERSIONS_ROOT)/$(LOCAL_SDK_RES_VERSION)/android.jar
-framework_res_package_export_deps := $(framework_res_package_export)
 else
 framework_res_package_export := \
     $(call intermediates-dir-for,APPS,framework-res,,COMMON)/package-export.apk
-framework_res_package_export_deps := \
-    $(dir $(framework_res_package_export))src/R.stamp
 endif
 endif
 
@@ -644,7 +640,7 @@
 $(my_res_package): PRIVATE_PRODUCT_AAPT_CONFIG :=
 $(my_res_package): PRIVATE_PRODUCT_AAPT_PREF_CONFIG :=
 $(my_res_package): PRIVATE_TARGET_AAPT_CHARACTERISTICS :=
-$(my_res_package) : $(framework_res_package_export_deps)
+$(my_res_package) : $(framework_res_package_export)
 
 full_android_manifest :=
 my_res_resources :=
diff --git a/core/static_java_library.mk b/core/static_java_library.mk
index b8f508b..309f76b 100644
--- a/core/static_java_library.mk
+++ b/core/static_java_library.mk
@@ -106,18 +106,14 @@
 endif
 
 framework_res_package_export :=
-framework_res_package_export_deps :=
 # Please refer to package.mk
 ifneq ($(LOCAL_NO_STANDARD_LIBRARIES),true)
 ifneq ($(filter-out current system_current test_current,$(LOCAL_SDK_RES_VERSION))$(if $(TARGET_BUILD_APPS),$(filter current system_current test_current,$(LOCAL_SDK_RES_VERSION))),)
 framework_res_package_export := \
     $(HISTORICAL_SDK_VERSIONS_ROOT)/$(LOCAL_SDK_RES_VERSION)/android.jar
-framework_res_package_export_deps := $(framework_res_package_export)
 else
 framework_res_package_export := \
     $(call intermediates-dir-for,APPS,framework-res,,COMMON)/package-export.apk
-framework_res_package_export_deps := \
-    $(dir $(framework_res_package_export))src/R.stamp
 endif
 endif
 
@@ -135,6 +131,8 @@
 import_proguard_flag_files :=
 endif
 
+include $(BUILD_SYSTEM)/aapt_flags.mk
+
 # add --non-constant-id to prevent inlining constants.
 # AAR needs text symbol file R.txt.
 ifdef LOCAL_USE_AAPT2
@@ -181,10 +179,10 @@
 endif  # renderscript_target_api < 21
 endif  # renderscript_target_api is set
 include $(BUILD_SYSTEM)/aapt2.mk
-$(my_res_package) : $(framework_res_package_export_deps)
+$(my_res_package) : $(framework_res_package_export)
 else
 $(R_file_stamp): PRIVATE_RESOURCE_LIST := $(all_resources)
-$(R_file_stamp) : $(all_resources) $(full_android_manifest) $(AAPT) $(framework_res_package_export_deps)
+$(R_file_stamp) : $(all_resources) $(full_android_manifest) $(AAPT) $(framework_res_package_export)
 	@echo "target R.java/Manifest.java: $(PRIVATE_MODULE) ($@)"
 	$(create-resource-java-files)
 	$(hide) find $(PRIVATE_SOURCE_INTERMEDIATES_DIR) -name R.java | xargs cat > $@
@@ -192,7 +190,6 @@
 
 $(LOCAL_BUILT_MODULE): $(R_file_stamp)
 $(java_source_list_file): $(R_file_stamp)
-$(foreach x,$(sharded_java_source_list_files),$(eval $(x): $(R_file_stamp)))
 $(full_classes_compiled_jar): $(R_file_stamp)
 $(full_classes_turbine_jar): $(R_file_stamp)