tree ae8d4ceb42602b19b62b61205a5bcb70e6ef6ab3
parent ad5f8731448f03c59d5fc8d9b5b25ee91d351ba9
author Sebastien Hertz <shertz@google.com> 1379419813 +0200
committer Sebastien Hertz <shertz@google.com> 1379424517 +0200

Load shadow frame's this object only upon instrumentation.

We used to load the shadow frame's this object when entering the interpreter
and push it into thread's SIRT to make it visible to garbage collector. But
it is only used by instrumentation listeners.

We now move this load at each place an instrumentation listener is called. This
avoids loading it when instrumentation is disabled. This also allows to remove
the SIRT reference and the push/pop management it implies when entering/exiting
the interpreter.

The performance improvement is 6% in average on our benchmarks suite.

This CL also makes method Instrumentation::ExceptionCaughtEvent const so we can
use a "const instrumentation::Instrumentation*" object in interpreter.

Change-Id: I2caccba9a906f244c8057b24031250f9824cc711