android dex编译,android编译dex-preopt

最新推荐文章于 2025-05-05 23:47:04 发布

转载最新推荐文章于 2025-05-05 23:47:04 发布

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本文详细介绍了Android 2.3在构建过程中如何进行dex预优化（dexpreopt），包括在buildspec.mk中设置变量、编译相关文件的修改以及dexpreopt-one-file函数的调用。内容涉及到编译变量、条件判断和签名过程，揭示了预优化apk的步骤。

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对于android2.3编译时候选择下面的情况，既可以对dex进行preopt优化了。

$ cat buildspec.mk

TARGET_BUILD_VARIANT:=user

TARGET_BUILD_TYPE:=release

编译相关文件：

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

build/core/product_config.mk:164

# Hack to make the linux build servers use dexpreopt (emulator-based

# preoptimization). Most engineers don't use this type of target

# ("make PRODUCT-blah-user"), so this should only tend to happen when

# using buildbot.

# TODO: Remove this once host Dalvik preoptimization is working.

ifeq ($(TARGET_BUILD_VARIANT),user)

WITH_DEXPREOPT_buildbot := true

endif

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

build/core/dex_preopt.mk:127

# dexpreoption for binary released jars

# ONLY enabled in custom release

ifeq ($(PARTIAL_BUILD),true)

ifeq ($(WITH_DEXPREOPT),true)

$(foreach m,$(DEXPREOPT_BINARY_RELEASE_BOOT_JARS_MODULES), \

$(eval $(call install-dexpreopt-jars.binary-release,$(m))) \

$(eval DEXPREOPT_BINARY_RELEASE_BOOT_JARS += \

$(TARGET_OUT_JAVA_LIBRARIES)/$(m).jar \

$(TARGET_OUT_JAVA_LIBRARIES)/$(m).odex \

) \

)

endif

# $(1): the input .jar or .apk file

# $(2): the output .odex file

define dexpreopt-one-file

$(hide) $(DEXPREOPT) --dexopt=$(DEXPREOPT_DEXOPT) --build-dir=$(DEXPREOPT_BUILD_DIR) \

--product-dir=$(DEXPREOPT_PRODUCT_DIR) --boot-dir=$(DEXPREOPT_BOOT_JAR_DIR) \

--boot-jars=$(DEXPREOPT_BOOT_JARS) $(DEXPREOPT_UNIPROCESSOR) \

$(patsubst $(DEXPREOPT_BUILD_DIR)/%,%,$(1)) \

$(patsubst $(DEXPREOPT_BUILD_DIR)/%,%,$(2))

endef

调用于：

build/core/dex_preopt.mk:111: $$(call dexpreopt-one-file,$$(PRIVATE_DBJ_JAR),$$@)

build/core/package.mk:440: $(call dexpreopt-one-file,$@,$(patsubst %.apk,%.odex,$@))

build/core/java_library.mk:121: $(call dexpreopt-one-file,$ build/core/prebuilt.mk:82: $(call dexpreopt-one-file,$@,$(patsubst %.apk,%.odex,$@))

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

build/core/package.mk:216

ifeq (true,$(WITH_DEXPREOPT))

ifeq (,$(TARGET_BUILD_APPS))

ifneq (,$(LOCAL_SRC_FILES))

ifndef LOCAL_DEX_PREOPT

LOCAL_DEX_PREOPT := true

endif

实际编译时对生成apk的地方：

# Define the rule to build the actual package.

$(LOCAL_BUILT_MODULE): $(AAPT) | $(ZIPALIGN)

ifeq ($(LOCAL_DEX_PREOPT),true)

# Make sure the boot jars get dexpreopt-ed first

$(LOCAL_BUILT_MODULE): $(DEXPREOPT_BOOT_ODEXS) | $(DEXPREOPT) $(DEXOPT)

endif

$(LOCAL_BUILT_MODULE): PRIVATE_JNI_SHARED_LIBRARIES := $(jni_shared_libraries)

ifneq ($(TARGET_BUILD_APPS),)

# Include all resources for unbundled apps.

$(LOCAL_BUILT_MODULE): PRODUCT_AAPT_CONFIG :=

endif

$(LOCAL_BUILT_MODULE): $(all_res_assets) $(jni_shared_libraries) $(full_android_manifest)

@echo "target Package: $(PRIVATE_MODULE) ($@)"

$(create-empty-package)

$(add-assets-to-package)

ifneq ($(jni_shared_libraries),)

$(add-jni-shared-libs-to-package)

endif

ifneq ($(full_classes_jar),)

$(add-dex-to-package)

endif

$(sign-package) // apk签名

@# Alignment must happen after all other zip operations.

$(align-package)

ifeq ($(LOCAL_DEX_PREOPT),true)// 对apk进行dexpreopt，定义于build/core/dex_preopt.mk

$(hide) rm -f $(patsubst %.apk,%.odex,$@)

$(call dexpreopt-one-file,$@,$(patsubst %.apk,%.odex,$@))

$(call dexpreopt-remove-classes.dex,$@)

built_odex := $(basename $(LOCAL_BUILT_MODULE)).odex

$(built_odex): $(LOCAL_BUILT_MODULE)

endif

apk签名函数定义于文件：build/core/definitions.mk +1456

# Sign a package using the specified key/cert.

define sign-package

$(hide) mv $@ $@.unsigned

$(hide) java -jar $(SIGNAPK_JAR) \

$(PRIVATE_CERTIFICATE) $(PRIVATE_PRIVATE_KEY) $@.unsigned $@.signed

$(hide) mv $@.signed $@

endef

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

./core/main.mk:183: WITH_DEXPREOPT := true

./core/main.mk:246: WITH_DEXPREOPT := true

./core/main.mk:252: ifeq ($(HOST_OS)-$(WITH_DEXPREOPT_buildbot),linux-true)

./core/main.mk:253: WITH_DEXPREOPT := true

183

ifeq (user, $(TARGET_BUILD_VARIANT))

WITH_DEXPREOPT := true

endif

# Bring in dex_preopt.mk

include $(BUILD_SYSTEM)/dex_preopt.mk

246

user_variant := $(filter userdebug user,$(TARGET_BUILD_VARIANT))

enable_target_debugging := true

ifneq (,$(user_variant))

...

# enable dex pre-optimization for all TARGET projects in default to

# speed up device first boot-up

WITH_DEXPREOPT := true

...

# TODO: Remove this and the corresponding block in

# config/product_config.make once host-based Dalvik preoptimization is

# working.

ifneq (true,$(DISABLE_DEXPREOPT))

ifeq ($(HOST_OS)-$(WITH_DEXPREOPT_buildbot),linux-true)

WITH_DEXPREOPT := true

endif

...

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

build/core/java_library.mk +68

ifeq (true,$(WITH_DEXPREOPT))

ifeq (,$(TARGET_BUILD_APPS))

ifndef LOCAL_DEX_PREOPT

LOCAL_DEX_PREOPT := true

endif

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

build/core/java_library.mk +68

ifneq ($(filter APPS,$(LOCAL_MODULE_CLASS)),)

ifeq (true,$(WITH_DEXPREOPT))

ifeq (,$(TARGET_BUILD_APPS))

ifndef LOCAL_DEX_PREOPT

LOCAL_DEX_PREOPT := true

endif

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++