tree d46a6c7bebb45ddbbd5b0a6818b3bb2ce49f48ed
parent f0170ded84fbcd3d9152cdbcf9ffbf74c71b03ba
author Sebastien Hertz <shertz@google.com> 1440065277 +0200
committer Sebastien Hertz <shertz@google.com> 1440508429 +0200

Fix deoptimization with pending exception

When deoptimizing the stack, we set a fake exception in the current
Thread* (see method Thread::GetDeoptimizationException). On the next
exception check, the QuickExceptionHandler will deoptimize the stack.

The issue is when we deoptimize while an exception is already pending
in the current Thread*: setting the fake exception will clobber the
pending exception which is not correct. This happens in the
artQuickToInterpreterBridge when returning from the interpreter and
we want to deoptimize the stack for debugging (like single-stepping).

This CL saves the pending exception before asking for deoptimization.
Then the exception is restored just before executing the deoptimized
frames with the interpreter.

Also cleans up the way we save deoptimization context (return value
and pending exception).

Bug: 23371176
Bug: 19944235
Change-Id: I7f4c8347b328817c452beda3399e210eba3a88a4