Store API callback entry address prior to entering a callback.

Store API callback entry address prior to entering a callback.

Callback entry address is stored in VMState and is later retrieved by
profiler stack sampler. This makes possible relating API entry to JS
stack, and this is simpler than trying to unwind native stack.

Committed: http://code.google.com/p/v8/source/detail?r=3344

[Søren Thygesen Gjesse, 2009-11-23 14:35:12]

LGTM

http://codereview.chromium.org/437004/diff/1/4
File src/log.cc (right):

http://codereview.chromium.org/437004/diff/1/4#newcode159
src/log.cc:159: const Address callback = Logger::current_state_ ?
Please use Logger::current_state_ != NULL.

[mnaganov (inactive), 2009-11-23 14:42:26]

Thanks!

http://codereview.chromium.org/437004/diff/1/4
File src/log.cc (right):

http://codereview.chromium.org/437004/diff/1/4#newcode159
src/log.cc:159: const Address callback = Logger::current_state_ ?
On 2009/11/23 14:35:12, Søren Gjesse wrote:
> Please use Logger::current_state_ != NULL.

Done.