tree 9623ccc48b09c858fe609020b51718253542e717
parent 3ef0cc306202eefe482c3dca5e6450906a82adc1
author Hai Zhang <zhanghai@google.com> 1668232124 -0800
committer Hai Zhang <zhanghai@google.com> 1668631892 -0800

Add services.permission java_library_static with Kotlin.

The permission and app op subsystems turned out to have a lot more
hidden references throughout the system server and it's infeasible to
define system APIs for all those references in U. So to allow
utilizing the new unified subsystem for them, we need to keep the new
subsystem in the non-updatable platform for now.

The Kotlin usage for the new subsystem was approved for the APEX
system server JAR inside Permission Mainline module, and we can
achieve the same criteria with a standalone Java library module in the
non-updatable platform, so that Kotlin is still jarjar'ed, shrunk and
only available within this module.

A caveat is that because R8 converts Java byte code to Dalvik byte
code, it can only be run when producing the final services.jar,
instead of directly when compiling this new java_library_static
module. Fortunately, services.jar has already enabled R8 shrinking
when SYSTEM_OPTIMIZE_JAVA is enabled, and when it's disabled due to
dependent JARs, we can still safely confine the shrinking within the
new module with a negated rule since no other JARs can depend on the
new code.

The BloatBuster check showed that on AAOS (with SYSTEM_OPTIMIZE_JAVA
disabled), the size of services.odex increased by 1 MB (21.3 MB ->
22.4 MB), but looking at installed-files.json from its build output,
the size of services.jar actually decreased by 2 MB (21.8 MB -> 19.4
MB). Since both of them are pinned in memory, and the new ODEX will
actually have better performance due to better optimization, it's
still a net improvement from the current situation. More details about
this is available at b/258943585#comment14.

An alternative is to create a standalone system server JAR that's also
loaded into SSCP. However, that approach is said to be causing a
slight boot time regression in b/155631167.

Bug: 182523293
Test: presubmit
Test: AyeAye BloatBuster
Test: CtsStrictJavaPackagesTestCases
Change-Id: Id35e19b941e9abbba0d039f993bbf4ec183554ab