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Forward white to grey transition only if slot is before the progress bar of a given object.

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BUG=

Review URL: https://codereview.chromium.org/11415070

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13063 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
hpayer@chromium.org 2012-11-26 16:16:49 +00:00
parent ec49191302
commit 865828f37e
2 changed files with 12 additions and 2 deletions
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8
src/incremental-marking-inl.h
View File

@ -44,8 +44,12 @@ bool IncrementalMarking::BaseRecordWrite(HeapObject* obj,
if (Marking::IsBlack(obj_bit)) {
MemoryChunk* chunk = MemoryChunk::FromAddress(obj->address());
if (chunk->IsFlagSet(MemoryChunk::HAS_PROGRESS_BAR)) {
WhiteToGreyAndPush(value_heap_obj, value_bit);
RestartIfNotMarking();
if (chunk->IsLeftOfProgressBar(slot)) {
WhiteToGreyAndPush(value_heap_obj, value_bit);
RestartIfNotMarking();
} else {
return false;
}
} else {
BlackToGreyAndUnshift(obj, obj_bit);
RestartIfNotMarking();

6
src/spaces.h
View File

@ -503,6 +503,12 @@ class MemoryChunk {
}
}
bool IsLeftOfProgressBar(Object** slot) {
Address slot_address = reinterpret_cast<Address>(slot);
ASSERT(slot_address > this->address());
return (slot_address - this->address() + kObjectStartOffset) <
progress_bar();
}
static void IncrementLiveBytesFromGC(Address address, int by) {
MemoryChunk::FromAddress(address)->IncrementLiveBytes(by);