27 lines
1.6 KiB
Plaintext
27 lines
1.6 KiB
Plaintext
|
We build an equivalent of the jacoco-agent.jar which contains classes from org.jacoco.core,
|
||
|
|
org.jacoco.agent and org.jacoco.agent.rt packages but also classes from asm 5.0.1.
|
||
|
|
|
||
|
|
However, Jacoco depends on classes that do not exist in Android (java.lang.instrument.* or
|
||
|
|
javax.management.*) for runtime instrumentation only. The ART compiler would reject those classes
|
||
|
|
when they are either in the bootclasspath (core, frameworks, ...) or system apps.
|
||
|
|
|
||
|
|
Since we only use offline instrumentation for code coverage (using Jack) and do not execute these
|
||
|
|
classes at runtime, we simply not compile them here.
|
||
|
|
|
||
|
|
We also need to modify the source code to cut dependencies to the classes that we exclude from the
|
||
|
|
compilation. The changes are surrounded by "BEGIN android-change" and "END android-change". Here
|
||
|
|
is the list of the changes:
|
||
|
|
|
||
|
|
1) Remove the creation of JmxRegistration in org.jacoco.agent.rt.internal.Agent.
|
||
|
|
2) Change default OutputMode to none in org.jacoco.core.runtime.AgentOptions
|
||
|
|
3) Change the runtime to reduce dependencies on core libraries.
|
||
|
|
Previously, Offline's static initializer would eagerly create an
|
||
|
|
Agent, a process which has lots of dependencies. With this change,
|
||
|
|
Offline only eagerly creates a Map<Long, ExecutionData>, which is much
|
||
|
|
more lightweight. The Agent is only created when it's actually
|
||
|
|
needed. This makes it possible to instrument a lot of more core
|
||
|
|
libraries without creating a circular dependency at runtime.
|
||
|
|
4) Disable use of 'constant dynamic' bytecode in
|
||
|
|
org.jacoco.core.internal.instr.ProbeArrayStrategyFactory, because R8/D8 doesn't support it.
|
||
|
|
(https://issuetracker.google.com/178172809)
|