| commit | c5df5eb81a607f3de35cb2f60e6aaf03b95d5fd2 | [log] [tgz] |
|---|---|---|
| author | Yohann Roussel <yroussel@google.com> | Tue Sep 19 08:15:58 2017 +0200 |
| committer | Yohann Roussel <yroussel@google.com> | Tue Sep 19 08:15:58 2017 +0200 |
| tree | 076d4b5865083e911590bb0f74610b5a74c8ca8f | |
| parent | 0aa480544b70076bdf7cd8e80f3f904fd2667bdc [diff] |
Change filePerClass semanthic to filePerInputClass Meaning that synthesized classes are emitted in the individual dex files of the input classes they were generated from. Shared synthetic classes may then by emitted in several individual dex files, those duplicates will then be removed by merging. Bug: 65725257 Change-Id: Ib1032c81dcaa08ab9c490caa45d8243fce3fbdf6
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.
For questions, bug reports and other issues reach out to us at r8-dev@googlegroups.com.