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# Copyright 2023 The Bazel Authors. All rights reserved.
#
# 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.
"""R8 processor steps for android_binary_internal."""
load("//rules:acls.bzl", "acls")
load("//rules:proguard.bzl", "proguard")
load(
"//rules:utils.bzl",
"ANDROID_TOOLCHAIN_TYPE",
"get_android_sdk",
"get_android_toolchain",
)
load(
"//rules:processing_pipeline.bzl",
"ProviderInfo",
)
load("//rules:common.bzl", "common")
load("//rules:java.bzl", "java")
load("//rules:resources.bzl", _resources = "resources")
def process_r8(ctx, jvm_ctx, packaged_resources_ctx, build_info_ctx, **_unused_ctxs):
"""Runs R8 for desugaring, optimization, and dexing.
Args:
ctx: Rule contxt.
jvm_ctx: Context from the java processor.
packaged_resources_ctx: Context from resource processing.
build_info_ctx: Context from build info processor.
**_unused_ctxs: Unused context.
Returns:
The r8_ctx ProviderInfo.
"""
local_proguard_specs = ctx.files.proguard_specs
if not acls.use_r8(str(ctx.label)) or not local_proguard_specs:
return ProviderInfo(
name = "r8_ctx",
value = struct(
providers = [],
),
)
# The R8 processor step creates its own deploy jar instead of
# The deploy jar from the deploy_jar processor is not used because as of now, whether it
# actually produces a deploy jar is determinted by a separate set of ACLs, and also does
# desugaring differently than with R8.
deploy_jar = ctx.actions.declare_file(ctx.label.name + "_deploy.jar")
java.create_deploy_jar(
ctx,
output = deploy_jar,
runtime_jars = depset(
direct = jvm_ctx.java_info.runtime_output_jars + [packaged_resources_ctx.class_jar],
transitive = [jvm_ctx.java_info.transitive_runtime_jars],
),
java_toolchain = common.get_java_toolchain(ctx),
build_target = ctx.label.name,
deploy_manifest_lines = build_info_ctx.deploy_manifest_lines,
)
dexes_zip = ctx.actions.declare_file(ctx.label.name + "_dexes.zip")
android_jar = get_android_sdk(ctx).android_jar
proguard_specs = proguard.get_proguard_specs(ctx, packaged_resources_ctx.resource_proguard_config)
min_sdk_version = getattr(ctx.attr, "min_sdk_version", None)
args = ctx.actions.args()
args.add("--release")
if min_sdk_version:
args.add("--min-api", min_sdk_version)
args.add("--output", dexes_zip)
args.add_all(proguard_specs, before_each = "--pg-conf")
args.add("--lib", android_jar)
args.add(deploy_jar) # jar to optimize + desugar + dex
java.run(
ctx = ctx,
host_javabase = common.get_host_javabase(ctx),
executable = get_android_toolchain(ctx).r8.files_to_run,
arguments = [args],
inputs = [android_jar, deploy_jar] + proguard_specs,
outputs = [dexes_zip],
mnemonic = "AndroidR8",
progress_message = "R8 Optimizing, Desugaring, and Dexing %{label}",
)
android_dex_info = AndroidDexInfo(
deploy_jar = deploy_jar,
final_classes_dex_zip = dexes_zip,
# R8 preserves the Java resources (i.e. non-Java-class files) in its output zip, so no need
# to provide a Java resources zip.
java_resource_jar = None,
)
return ProviderInfo(
name = "r8_ctx",
value = struct(
final_classes_dex_zip = dexes_zip,
providers = [android_dex_info],
),
)
def process_resource_shrinking_r8(ctx, r8_ctx, packaged_resources_ctx, **_unused_ctxs):
"""Runs resource shrinking.
Args:
ctx: Rule contxt.
r8_ctx: Context from the R8 processor.
packaged_resources_ctx: Context from resource processing.
**_unused_ctxs: Unused context.
Returns:
The r8_ctx ProviderInfo.
"""
local_proguard_specs = ctx.files.proguard_specs
if (not acls.use_r8(str(ctx.label)) or
not local_proguard_specs or
not _resources.is_resource_shrinking_enabled(
ctx.attr.shrink_resources,
ctx.fragments.android.use_android_resource_shrinking,
)):
return ProviderInfo(
name = "resource_shrinking_r8_ctx",
value = struct(
android_application_resource_info_with_shrunk_resource_apk = None,
providers = [],
),
)
android_toolchain = get_android_toolchain(ctx)
# 1. Convert the resource APK to proto format (resource shrinker operates on a proto apk)
proto_resource_apk = ctx.actions.declare_file(ctx.label.name + "_proto_resource_apk.ap_")
ctx.actions.run(
arguments = [ctx.actions.args()
.add("convert")
.add(packaged_resources_ctx.resources_apk) # input apk
.add("-o", proto_resource_apk) # output apk
.add("--output-format", "proto")],
executable = android_toolchain.aapt2.files_to_run,
inputs = [packaged_resources_ctx.resources_apk],
mnemonic = "Aapt2ConvertToProtoForResourceShrinkerR8",
outputs = [proto_resource_apk],
toolchain = ANDROID_TOOLCHAIN_TYPE,
)
# 2. Run the resource shrinker
proto_resource_apk_shrunk = ctx.actions.declare_file(
ctx.label.name + "_proto_resource_apk_shrunk.ap_",
)
java.run(
ctx = ctx,
host_javabase = common.get_host_javabase(ctx),
executable = android_toolchain.resource_shrinker.files_to_run,
arguments = [ctx.actions.args()
.add("--input", proto_resource_apk)
.add("--dex_input", r8_ctx.final_classes_dex_zip)
.add("--output", proto_resource_apk_shrunk)],
inputs = [proto_resource_apk, r8_ctx.final_classes_dex_zip],
outputs = [proto_resource_apk_shrunk],
mnemonic = "ResourceShrinkerForR8",
progress_message = "Shrinking resources %{label}",
)
# 3. Convert back to a binary APK
resource_apk_shrunk = ctx.actions.declare_file(ctx.label.name + "_resource_apk_shrunk.ap_")
ctx.actions.run(
arguments = [ctx.actions.args()
.add("convert")
.add(proto_resource_apk_shrunk) # input apk
.add("-o", resource_apk_shrunk) # output apk
.add("--output-format", "binary")],
executable = android_toolchain.aapt2.files_to_run,
inputs = [proto_resource_apk_shrunk],
mnemonic = "Aapt2ConvertBackToBinaryForResourceShrinkerR8",
outputs = [resource_apk_shrunk],
toolchain = ANDROID_TOOLCHAIN_TYPE,
)
aari = packaged_resources_ctx.android_application_resource
# Replace the resource apk in the AndroidApplicationResourceInfo provider from resource
# processing.
new_aari = AndroidApplicationResourceInfo(
resource_apk = resource_apk_shrunk,
resource_java_src_jar = aari.resource_java_src_jar,
resource_java_class_jar = aari.resource_java_class_jar,
manifest = aari.manifest,
resource_proguard_config = aari.resource_proguard_config,
main_dex_proguard_config = aari.main_dex_proguard_config,
r_txt = aari.r_txt,
resources_zip = aari.resources_zip,
databinding_info = aari.databinding_info,
should_compile_java_srcs = aari.should_compile_java_srcs,
)
return ProviderInfo(
name = "resource_shrinking_r8_ctx",
value = struct(
android_application_resource_info_with_shrunk_resource_apk = new_aari,
providers = [],
),
)
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