hmz007
36ed224bac
Signed-off-by: hmz007 <hmz007@gmail.com> Change-Id: Ib87fdbe7a0be7dc961af3500fe9ea4589a127f9f
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,
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org.jacoco.agent and org.jacoco.agent.rt packages but also classes from asm 5.0.1.
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However, Jacoco depends on classes that do not exist in Android (java.lang.instrument.* or
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javax.management.*) for runtime instrumentation only. The ART compiler would reject those classes
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when they are either in the bootclasspath (core, frameworks, ...) or system apps.
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Since we only use offline instrumentation for code coverage (using Jack) and do not execute these
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classes at runtime, we simply not compile them here.
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We also need to modify the source code to cut dependencies to the classes that we exclude from the
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compilation. The changes are surrounded by "BEGIN android-change" and "END android-change". Here
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is the list of the changes:
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1) Remove the creation of JmxRegistration in org.jacoco.agent.rt.internal.Agent.
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2) Change default OutputMode to none in org.jacoco.core.runtime.AgentOptions
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3) Change the runtime to reduce dependencies on core libraries.
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Previously, Offline's static initializer would eagerly create an
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Agent, a process which has lots of dependencies. With this change,
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Offline only eagerly creates a Map<Long, ExecutionData>, which is much
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more lightweight. The Agent is only created when it's actually
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needed. This makes it possible to instrument a lot of more core
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libraries without creating a circular dependency at runtime.
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4) Disable use of 'constant dynamic' bytecode in
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org.jacoco.core.internal.instr.ProbeArrayStrategyFactory, because R8/D8 doesn't support it.
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(https://issuetracker.google.com/178172809)
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