commit | e36a23ecfcb62c6f5133bd765f8d77ebe5d86a1c | [log] [tgz] |
---|---|---|
author | Morten Krogh-Jespersen <mkroghj@google.com> | Thu Jan 09 14:50:32 2020 +0100 |
committer | Morten Krogh-Jespersen <mkroghj@google.com> | Thu Jan 09 13:52:20 2020 +0000 |
tree | 5b67c9cf6d92efa8849fa9a42fd92cbc8327327e | |
parent | a2a59f9960bfce5e589e901d1286314a5538c8b4 [diff] |
Unique names for overloads by separating naming and reservation Newer ART-vms will output the PC of error instructions if no debug line information is present along with the method. Having a lot of overloads, which we normally generate to have as few strings as possible, will make debugging more difficult or require us to put in debug information since we cannot distinguish two methods with the same name in a stack trace. This CL changes this by generating unique names for all methods when targeting DEX. This will add a few more strings to the method pool but it seems like this is outweighed by savings to the debug info. Bug: 37830524 Bug: 18629172 Bug: 144877828 Change-Id: I6a751483131c5163e7d197a9760545bb24335469
The R8 repo contains two tools:
D8 is a replacement for the DX dexer and R8 is a replacement for the Proguard shrinking and minification tool.
The R8 project uses depot_tools
from the chromium project to manage dependencies. Install depot_tools
and add it to your path before proceeding.
The R8 project uses Java 8 language features and requires a Java 8 compiler and runtime system.
Typical steps to download and build:
$ git clone https://r8.googlesource.com/r8 $ cd r8 $ tools/gradle.py d8 r8
The tools/gradle.py
script will bootstrap using depot_tools to download a version of gradle to use for building on the first run. This will produce two jar files: build/libs/d8.jar
and build/libs/r8.jar
.
The D8 dexer has a simple command-line interface with only a few options.
The most important option is whether to build in debug or release mode. Debug is the default mode and includes debugging information in the resulting dex files. Debugging information contains information about local variables used when debugging dex code. This information is not useful when shipping final Android apps to users and therefore, final builds should use the --release
flag to remove this debugging information to produce smaller dex files.
Typical invocations of D8 to produce dex file(s) in the out directoy:
Debug mode build:
$ java -jar build/libs/d8.jar --output out input.jar
Release mode build:
$ java -jar build/libs/d8.jar --release --output out input.jar
The full set of D8 options can be obtained by running the command line tool with the --help
option.
R8 is a Proguard replacement for whole-program optimization, shrinking and minification. R8 uses the Proguard keep rule format for specifying the entry points for an application.
Typical invocations of R8 to produce optimized dex file(s) in the out directory:
$ java -jar build/libs/r8.jar --release --output out --pg-conf proguard.cfg input.jar
The full set of R8 options can be obtained by running the command line tool with the --help
option.
Typical steps to run tests:
$ tools/test.py --no_internal
The tools/test.py
script will use depot_tools to download a lot of tests and test dependencies on the first run. This includes prebuilt version of the art runtime on which to validate the produced dex code.
In order to contribute to D8/R8 you have to sign the Contributor License Agreement. If your contribution is owned by your employer you need the Corporate Contributor License Agreement.
Once the license agreement is in place, you can upload your patches using ‘git cl’ which is available in depot_tools. Once you have a change that you are happy with you should make sure that it passes all tests and then upload the change to our code review tool using:
$ git cl upload
On your first upload you will be asked to acquire credentials. Follow the instructions given by git cl upload
.
On successful uploads a link to the code review is printed in the output of the upload command. In the code review tool you can assign reviewers and mark the change ready for review. At that point the code review tool will send emails to reviewers.
For questions, reach out to us at r8-dev@googlegroups.com.
For D8, find known issues in the D8 issue tracker or file a new D8 bug report.
For R8, find known issues in the R8 issue tracker or file a new R8 bug report.