tree 8de4326eff202726c1ab893c536190aba87334be
parent 9ce960ab2b4c789ad364ad96ec5c660c60e4f90c
author Mathieu Chartier <mathieuc@google.com> 1500081805 -0700
committer Mathieu Chartier <mathieuc@google.com> 1501286979 -0700

Use class unloading in dex2oat for verify and extract

Unload the main classloader in between each dex file compilation to
reduce RAM. This frees the whole java heap and associated linear
allocs. This is only used for quickening since filters that do
compilation may require loaded classes in the compiler and oat
writer.

This reduces dex2oat peak PSS for compiling a large app from 196MB
to 135MB.

Only works for verify and extract since the current approach is
incompatible with oat writer patching. b/63911263

Added a verification override that reads the compiled class status
to avoid ever verifying classes that were quickened (since this
is not supported and causes failures).

There is still some duplicated verification for some class with
superclasses in other dex files.

Support for quicken will be added in a follow up CL.

Bug: 63467744
Test: test-art-host
Test: test/testrunner/testrunner.py --interpreter --host -j40
Change-Id: Id0e4f84eb5db91d6143f752b498f4832a5b25b6e