Add log compression ability.

Add log compression ability.

This is a trivial per-row compression:
- short aliases are introduced for events and code creation tags;
- in tick events, offsets are used instead of absolute addresses;
- removed 'code-allocation' event, as it seems not used.

The first two options are depend on the new flag: 'compress-log', which is off by default.

On benchmarks run w/o snapshot, this gives 45% log size reduction.

Committed: http://code.google.com/p/v8/source/detail?r=2122

[Søren Thygesen Gjesse, 2009-06-08 12:28:47]

LGTM

http://codereview.chromium.org/119304/diff/1/9
File src/log.cc (right):

http://codereview.chromium.org/119304/diff/1/9#newcode622
Line 622: void Logger::CodeCreateEvent(
I think we normally use the following format for long argument lists:

void Logger::CodeCreateEvent(LogEventsAndTags tag,
                             Code* code,
                             const char* comment) {

http://codereview.chromium.org/119304/diff/1/11
File src/stub-cache.cc (right):

http://codereview.chromium.org/119304/diff/1/11#newcode816
Line 816: LOG(CodeCreateEvent(
Please format this call like the others:

LOG(CodeCreateEvent(Logger::CALL_NORMAL_TAG,
                    code, code->arguments_count()));

[Mikhail Naganov, 2009-06-08 13:39:08]

http://codereview.chromium.org/119304/diff/1/9
File src/log.cc (right):

http://codereview.chromium.org/119304/diff/1/9#newcode622
Line 622: void Logger::CodeCreateEvent(
On 2009/06/08 12:28:47, Søren Gjesse wrote:
> I think we normally use the following format for long argument lists:
> 
> void Logger::CodeCreateEvent(LogEventsAndTags tag,
>                              Code* code,
>                              const char* comment) {

OK, fixed.

http://codereview.chromium.org/119304/diff/1/11
File src/stub-cache.cc (right):

http://codereview.chromium.org/119304/diff/1/11#newcode816
Line 816: LOG(CodeCreateEvent(
On 2009/06/08 12:28:47, Søren Gjesse wrote:
> Please format this call like the others:
> 
> LOG(CodeCreateEvent(Logger::CALL_NORMAL_TAG,
>                     code, code->arguments_count()));

Done.