98 lines
4.2 KiB
Plaintext
98 lines
4.2 KiB
Plaintext
Name: R8
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URL: https://r8.googlesource.com/r8
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Version: 3.0.33
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License: BSD 3-Clause
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License File: NOT_SHIPPED
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Security Critical: no
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Description:
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lib/r8.jar
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- Contains R8 (proguard replacement) as well as D8 (dexer).
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3pp
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- Contains code for 3pp-linux-amd64-packager to package and upload new versions of r8.
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desugar_jdk_libs.json
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- Configuration for Java library desugaring.
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- Taken from
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//third_party/android_deps/libs/com_android_tools_desugar_jdk_libs_configuration/
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inside the jar file, in META-INF/desugar/d8/desugar.json. License is also BSD
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3-Clause (the r8 version).
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R8 is a proguard-like optimizer that also has the ability to dex.
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Local Modifications:
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* Refer to commit descriptions within "3pp/patches" directory.
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* Added "playground" directory for quick "how does this optimize" tests.
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* Removed references to ConcurrentHashMap and TimeZone#getTimeZone in desugar_jdk_libs.json.
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* Added "java/src/org/chromium/build/CustomD8.java", custom_d8.jar, and BUILD.gn.
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* Used in "build/android/gyp/dex.py" to enable desugar dependencies.
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Update Instructions:
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* For the custom d8 jar:
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* This is required only when CustomD8.java changes.
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* Uncomment the flag --skip-custom-d8 in internal_rules.gni to avoid depending
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on the previously built custom_d8.jar.
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autoninja -C out/Debug third_party/r8:custom_d8_java
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cp out/Debug/obj/third_party/r8/custom_d8_java.javac.jar third_party/r8/custom_d8.jar
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* For a new version of r8:
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* Find the latest successful run of the build bot:
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* https://ci.chromium.org/p/chromium/builders/ci/3pp-linux-amd64-packager
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* The bot autoruns every 6 hours. Ping a trooper to trigger it if you need it sooner.
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* https://luci-scheduler.appspot.com/jobs/chromium/3pp-linux-amd64-packager
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* Go to its log page and look under:
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* Expand "building chromium/third_party/r8" to see the CIPD instance ID.
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* Copy this instance ID to the r8 entry in //DEPS.
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* Update this file with the new version string and submit.
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* If patching fails:
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git clone https://r8.googlesource.com/r8
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cd r8
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* Find latest tag:
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git fetch origin --tags
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git tag -l # Often unnecessary as output from the fetch includes recent tags.
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git checkout $TAG # e.g. 3.0.25-dev, whichever tag failed patching.
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* Apply patches:
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git checkout -b my_branch
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git am $CHROMIUM_SRC/third_party/r8/patches/*.patch
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* Fix patch conflicts.
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* Save new patches. Change number if expecting more or fewer patches:
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git format-patch -3 -o $CHROMIUM_SRC/third_party/r8/3pp/patches
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* Submit these fixed patches and the bot will automatically retry.
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* Local development (see above for setting up the r8 repo):
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* Build
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tools/gradle.py r8
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* Shrink (improves r8/d8 launch time):
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java -jar build/libs/r8.jar --debug --classfile --output r8.jar \
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--lib $CHROMIUM_SRC/third_party/jdk/current --pg-conf src/main/keep.txt \
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--no-minification --no-desugaring build/libs/r8.jar
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mv $CHROMIUM_SRC/third_party/r8/lib/r8.jar{,.bak}
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cp r8.jar $CHROMIUM_SRC/third_party/r8/lib/r8.jar
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* Update backported methods list:
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cd $CHROMIUM_SRC
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java -cp third_party/r8/lib/r8.jar com.android.tools.r8.BackportedMethodList --min-api 16 > third_party/r8/backported_methods.txt
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* Update instructions for desugar_jdk_libs.json:
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unzip -p third_party/android_deps/libs/com_android_tools_desugar_jdk_libs_configuration/*.jar META-INF/desugar/d8/desugar.json > third_party/r8/desugar_jdk_libs.json
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* Remove all mentions of ConcurrentHashMap and TimeZone#getTimeZone and remove trailing commas.
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* Update //build/config/android/internal_rules.gni to point at the new .jar files:
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* desugar_jdk_libs-1.1.1.jar
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* desugar_jdk_libs_configuration-1.1.1.jar
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How to file bugs against R8:
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* Copy & paste the failing ninja command (starts with proguard.py), and add --dump-inputs.
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* This also works for dex.py, it produces d8inputs.zip
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* File bug at go/r8bug
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* Things to include (use discretion if some are not relevant):
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* src revision bug reproduces at
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* Repro steps (gn gen & autoninja commands)
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* Prefer enable_chrome_android_internal=false
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* The r8inputs.zip from --dump-inputs
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* Any relevant dexdump analysis
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How to submit CLs to R8:
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* Request to be added to their allowlist in order to upload CLs.
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* After CLs are submitted, check the bots for build breakage.
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* https://ci.chromium.org/p/r8/g/main_all/console
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