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android_frameworks_base/tools/hoststubgen/README.md

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HostStubGen

Overview

HostStubGen is a tool built for ravenwood. It can read an Android framework jar file (such as framework-minus-apex.jar or framework-all.jar) and converts them, so that they can be used on the Ravenwood environment.

This directory contains the HostStubGen source code, tests and some library source files used at runtime.

  • HostStubGen itself is design to be agnostic to Android. It doesn't use any Android APIs (hidden or not). But it may use Android specific knowledge -- e.g. as of now, AndroidHeuristicsFilter has hardcoded heuristics to detect AIDL generated classes.

  • test-tiny-framework/ contains basic tests that are agnostic to Android.

  • More Android specific build files and code are stored in frameworks/base/Ravenwood.bp frameworks/base/ravenwood.

Directories and files

  • hoststubgen/ Contains source code of the "hoststubgen" tool and relevant code

    • src/

      HostStubGen tool source code.

    • annotations-src/ See Android.bp.

    • helper-framework-buildtime-src/ See Android.bp.

    • helper-framework-runtime-src/ See Android.bp.

    • helper-runtime-src/ See Android.bp.

    • test-tiny-framework/ See README.md in it.

  • scripts

    • dump-jar.sh

      A script to dump the content of *.class and *.jar files.

    • run-all-tests.sh

      Run all tests. Many tests may fail, but at least this should run til the end. (It should print run-all-tests.sh finished at the end)

Build and run

Building HostStubGen binary

m hoststubgen

Run the tests

  • Run all relevant tests and test scripts. All of it is expected to pass, and it'll print "Ready to submit" at the end.

    However, because some of the script it executes depend on internal file paths to Soong's intermediate directory, some of it might fail when something changes in the build system.

    We need proper build system integration to fix them.

$ ./scripts/run-all-tests.sh
  • See also README.md in test-* directories.

TODOs, etc

  • Make sure the parent's visibility is not smaller than the member's.

  • @HostSideTestNativeSubstitutionClass should automatically add class-keep to the substitute class. (or at least check it.)

  • The HostStubGenTest-framework-test-host-test-lib jar somehow contain all ASM classes? Figure out where the dependency is coming from.

  • At some point, we can move or delete all Android specific code to frameworks/base/ravenwood.

    • helper-framework-*-src should be moved to frameworks/base/ravenwood
    • test-framework should be deleted.