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toolchains.bzl
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# Copyright (C) 2023 The Android Open Source Project
#
# 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.
load("//build/bazel/rules/java:bootclasspath.bzl", "bootclasspath")
load("//build/bazel/rules/java:java_system_modules.bzl", "java_system_modules")
load("//build/bazel/rules/java:import.bzl", "java_import")
load("//build/bazel/rules/java:versions.bzl", "java_versions")
load("//prebuilts/sdk:utils.bzl", "prebuilt_sdk_utils")
load("@bazel_tools//tools/jdk:default_java_toolchain.bzl", "DEFAULT_JAVACOPTS", "default_java_toolchain")
load("//build/bazel/rules/common:api.bzl", "api")
load("//build/bazel/rules/common:sdk_version.bzl", "sdk_version")
load("@soong_injection//java_toolchain:constants.bzl", "constants")
load("//build/bazel/rules/java/sdk:config_setting_names.bzl", sdk_config_setting = "config_setting_names")
load("//build/bazel/rules/java/errorprone:errorprone.bzl", "errorprone_global_flags")
# //prebuilts/sdk/current is a package, but the numbered directories under //prebuilts/sdk/ are not.
def _prebuilt_path_prefix(kind, api_level):
common_prefix = "//prebuilts/sdk"
if api_level == api.FUTURE_API_LEVEL:
return "%s/current:%s" % (common_prefix, prebuilt_sdk_utils.to_kind_dir(kind))
return "%s:%s/%s" % (common_prefix, api_level, prebuilt_sdk_utils.to_kind_dir(kind))
def _core_system_module_name(kind, api_level):
return "%s_%s_core_system_module" % (kind, api_level)
def _android_jar_import_name(kind, api_level):
return "%s_%s_android_jar" % (kind, api_level)
def _android_jar_file_name(kind, api_level):
return "%s/android.jar" % _prebuilt_path_prefix(kind, api_level)
_SDK_PACKAGE_PREFIX = "//build/bazel/rules/java/sdk:"
_JAVA_PACKAGE_PREFIX = "//build/bazel/rules/java:"
def prebuilts_toolchain(java_toolchain_name, android_sdk_toolchain_name):
"""Creates a device java and android toolchain and their dependencies.
Defines all java_import, java_system_modules, and bootclasspath targets that enable building
java/android/kotlin targets against a prebuilt SDK. Defines config settings at the proper
granularity (based on java version and sdk version), and the mappings between config setting and
proper toolchain attributes.
"""
java_version_select_dict = {
_JAVA_PACKAGE_PREFIX + setting: str(version)
for version, setting in java_versions.VERSION_TO_CONFIG_SETTING.items()
}
bootclasspath_select_dict = {
_SDK_PACKAGE_PREFIX + sdk_config_setting.SDK_NONE: [],
}
# android_jar_select_dict and framework_aidl_select_dict are only used by the android
# toolchain. We should never be in a situation where sdk_version = "none" and we're trying to
# build an android_* target, but:
# 1. a Bazel check enforces that every toolchain attribute resolves under every
# configuration, and
# 2. the DexArchiveAspect can propagate to java_host_for_device dependencies, and
# tries to access an android.jar from there (b/278596841).
# We should map "none" to an explicitly failing target to address 1, but until 2 is resolved,
# we point to the public current artifacts.
android_jar_select_dict = {
_SDK_PACKAGE_PREFIX + sdk_config_setting.SDK_NONE: _android_jar_file_name(
sdk_version.KIND_PUBLIC,
api.FUTURE_API_LEVEL,
), # ":failed_android.jar",
}
framework_aidl_select_dict = {
_SDK_PACKAGE_PREFIX + sdk_config_setting.SDK_NONE: "%s/framework.aidl" % (
_prebuilt_path_prefix(
prebuilt_sdk_utils.to_aidl_kind(sdk_version.KIND_PUBLIC, api.FUTURE_API_LEVEL),
api.FUTURE_API_LEVEL,
)
), # ":failed_framework.aidl",
}
for api_level in prebuilt_sdk_utils.API_LEVELS:
for kind in prebuilt_sdk_utils.available_core_kinds_for_api_level(api_level):
java_import(
name = "%s_%s_core_jar" % (kind, api_level),
jars = ["%s/core-for-system-modules.jar" % _prebuilt_path_prefix(kind, api_level)],
)
java_system_modules(
name = _core_system_module_name(kind, api_level),
deps = [":%s_%s_core_jar" % (kind, api_level)],
)
for kind in prebuilt_sdk_utils.available_kinds_for_api_level(api_level):
java_import(
name = _android_jar_import_name(kind, api_level),
jars = [_android_jar_file_name(kind, api_level)],
)
config_setting = _SDK_PACKAGE_PREFIX + sdk_config_setting.kind_api(kind, api_level)
android_jar_select_dict[config_setting] = _android_jar_file_name(
kind,
api_level,
)
framework_aidl_select_dict[config_setting] = "%s/framework.aidl" % (
_prebuilt_path_prefix(
prebuilt_sdk_utils.to_aidl_kind(kind, api_level),
api_level,
)
)
if java_versions.supports_pre_java_9(api_level):
config_setting = _SDK_PACKAGE_PREFIX + sdk_config_setting.kind_api_pre_java_9(kind, api_level)
bootclasspath_select_dict[config_setting] = [_gen_bootclasspath(
pre_java_9 = True,
kind = kind,
api_level = api_level,
)]
if java_versions.supports_post_java_9(api_level):
config_setting = _SDK_PACKAGE_PREFIX + sdk_config_setting.kind_api_post_java_9(kind, api_level)
bootclasspath_select_dict[config_setting] = [_gen_bootclasspath(
pre_java_9 = False,
kind = kind,
api_level = api_level,
)]
default_java_toolchain(
name = java_toolchain_name,
bootclasspath = select(bootclasspath_select_dict),
source_version = select(java_version_select_dict),
target_version = select(java_version_select_dict),
# TODO(b/218720643): Support switching between multiple JDKs.
java_runtime = "//prebuilts/jdk/jdk17:jdk17_runtime",
toolchain_definition = False,
misc = errorprone_global_flags + DEFAULT_JAVACOPTS + constants.CommonJdkFlags + select({
_SDK_PACKAGE_PREFIX + sdk_config_setting.SDK_NONE: ["--system=none"],
"//conditions:default": [],
}),
)
native.android_sdk(
name = android_sdk_toolchain_name,
aapt = "//prebuilts/sdk/tools:linux/bin/aapt",
aapt2 = "//prebuilts/sdk/tools:linux/bin/aapt2",
adb = ":fail", # TODO: use system/core/adb ?
aidl = "//prebuilts/sdk/tools:linux/bin/aidl",
android_jar = select(android_jar_select_dict),
apksigner = ":apksigner",
dx = "//prebuilts/sdk/tools:dx", # TODO: add D8
framework_aidl = select(framework_aidl_select_dict),
main_dex_classes = "//prebuilts/sdk/tools:mainDexClasses.rules",
main_dex_list_creator = ":fail",
proguard = ":fail", # TODO: add R8
system = select({
key: bootclasspath_select_dict[key][0]
for key in bootclasspath_select_dict.keys()
if "none" not in key
} | {"//conditions:default": ":failed_bootclasspath"}),
shrinked_android_jar = select(android_jar_select_dict),
visibility = ["//visibility:public"],
zipalign = "//prebuilts/sdk/tools:linux/bin/zipalign",
)
def _gen_bootclasspath(pre_java_9, kind, api_level):
bootclasspath_name = "toolchain_%s_java_9_android_%s_%s_bootclasspath" % ("pre" if pre_java_9 else "post", kind, api_level)
auxiliary = [_android_jar_import_name(kind, api_level)]
bootclasspath_attr = [_android_jar_import_name(kind, api_level), ":core_lambda_stubs"]
system = None
if pre_java_9:
auxiliary = auxiliary + [":core_lambda_stubs"]
else:
system = _core_system_module_name(prebuilt_sdk_utils.to_core_kind(kind, api_level), api_level)
bootclasspath(
name = bootclasspath_name,
auxiliary = auxiliary,
bootclasspath = bootclasspath_attr,
system = system,
)
return bootclasspath_name