Compile using Jack.

This allows to compile dex targeted java sources using Jack and Jill.
Default is still to compile with the legacy toolchain. Default can be
switched to the new toolchain by setting environement variable:
export ANDROID_COMPILE_WITH_JACK=true
Toolchain can also be forced for one module by defining
LOCAL_USE_JACK:=true # false
in the mk portion defining the module.

Jack execution environement can be controlled with:

Global variable ANDROID_JACK_VM allow to change the jvm executing Jack.
Global variable ANDROID_JACK_VM_ARGS allows to change default args given
to the jvm.
Global variable ANDROID_JACK_EXTRA_ARGS allows to define some default args
to give to Jack

LOCAL_JACK_VM_ARGS allows to override default args given to the jvm for
the module.
LOCAL_JACK_EXTRA_ARGS allows to override default args passed to Jack.

Change-Id: Ib81a0fd5f86a51d1e0edbb81cc791d828a05dd29
diff --git a/core/host_dalvik_java_library.mk b/core/host_dalvik_java_library.mk
index 6583dd7..772245e 100644
--- a/core/host_dalvik_java_library.mk
+++ b/core/host_dalvik_java_library.mk
@@ -33,11 +33,13 @@
 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
 built_dex := $(intermediates.COMMON)/classes.dex
 
 LOCAL_INTERMEDIATE_TARGETS += \
     $(full_classes_compiled_jar) \
     $(full_classes_jarjar_jar) \
+    $(full_classes_jack) \
     $(full_classes_jar) \
     $(built_dex)
 
@@ -95,6 +97,7 @@
 	@echo Copying: $@
 	$(hide) $(ACP) -fp $< $@
 
+ifneq ($(strip $(LOCAL_USE_JACK)),true)
 $(built_dex): PRIVATE_INTERMEDIATES_DIR := $(intermediates.COMMON)
 $(built_dex): PRIVATE_DX_FLAGS := $(LOCAL_DX_FLAGS)
 $(built_dex): $(full_classes_jar) $(DX)
@@ -110,4 +113,31 @@
 	$(add-java-resources-to-package)
 endif
 
+else # LOCAL_USE_JACK
+$(LOCAL_INTERMEDIATE_TARGETS): \
+	PRIVATE_JACK_INTERMEDIATES_DIR := $(intermediates.COMMON)/jayces
+$(LOCAL_INTERMEDIATE_TARGETS):  PRIVATE_JACK_DEBUG_FLAGS := -g
+
+$(built_dex): PRIVATE_CLASSES_JACK := $(full_classes_jack)
+$(built_dex): PRIVATE_JACK_FLAGS := $(LOCAL_JACK_FLAGS)
+$(built_dex): $(java_sources) $(java_resource_sources) $(full_jack_lib_deps) \
+        $(jar_manifest_file) $(proto_java_sources_file_stamp) $(LOCAL_MODULE_MAKEFILE) \
+        $(LOCAL_MODULE_MAKEFILE) $(LOCAL_ADDITIONAL_DEPENDENCIES) $(JACK_JAR)
+	@echo Building with Jack: $@
+	$(jack-java-to-dex)
+
+$(full_classes_jack): $(built_dex)
+
+$(LOCAL_BUILT_MODULE): PRIVATE_DEX_FILE := $(built_dex)
+$(LOCAL_BUILT_MODULE): $(built_dex) $(java_resource_sources)
+	@echo "Host Jar: $(PRIVATE_MODULE) ($@)"
+	$(create-empty-package)
+	$(add-dex-to-package)
+	$(add-carried-jack-resources)
+ifneq ($(extra_jar_args),)
+	$(add-java-resources-to-package)
+endif
+
+endif # LOCAL_USE_JACK
+
 USE_CORE_LIB_BOOTCLASSPATH :=