Precisely sweep scan on scavenge pages and use heap iterator to iterate over them.

Precisely sweep scan on scavenge pages and use heap iterator to iterate over them.

BUG=
R=jarin@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=22154

[Jarin, 2014-07-02 12:11:14]

lgtm

[Hannes Payer (out of office), 2014-07-02 12:19:09]

Committed patchset #1 manually as r22154 (presubmit successful).

[rmcilroy, 2014-07-02 12:39:07]

lgtm

https://codereview.chromium.org/362313002/diff/1/src/store-buffer.cc
File src/store-buffer.cc (right):

https://codereview.chromium.org/362313002/diff/1/src/store-buffer.cc#newcode560
src/store-buffer.cc:560: // We skip filler, free space, and constant pool
objects.
Could you add back the old comment here please:

// Skip fillers, free space, and constant pool arrays (which never 
// contain new-space pointers but can contain pointers which can 
// be confused for fillers).

[rmcilroy, 2014-07-02 12:39:31]

On 2014/07/02 12:39:07, rmcilroy wrote:
> lgtm
> 
> https://codereview.chromium.org/362313002/diff/1/src/store-buffer.cc
> File src/store-buffer.cc (right):
> 
>
https://codereview.chromium.org/362313002/diff/1/src/store-buffer.cc#newcode560
> src/store-buffer.cc:560: // We skip filler, free space, and constant pool
> objects.
> Could you add back the old comment here please:
> 
> // Skip fillers, free space, and constant pool arrays (which never 
> // contain new-space pointers but can contain pointers which can 
> // be confused for fillers).

Ahh, I see I missed the boat - never mind with the comment then.