When shrinking semispace don't relink pages if semispace is not committed
R=mstarzinger@chromium.org Review URL: http://codereview.chromium.org/9086005 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10333 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
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@ -1256,6 +1256,7 @@ bool SemiSpace::ShrinkTo(int new_capacity) {
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ASSERT((new_capacity & Page::kPageAlignmentMask) == 0);
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ASSERT(new_capacity >= initial_capacity_);
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ASSERT(new_capacity < capacity_);
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if (is_committed()) {
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// Semispaces grow backwards from the end of their allocated capacity,
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// so we find the before and after start addresses relative to the
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// end of the space.
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@ -1263,17 +1264,21 @@ bool SemiSpace::ShrinkTo(int new_capacity) {
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Address old_start = space_end - capacity_;
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size_t delta = capacity_ - new_capacity;
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ASSERT(IsAligned(delta, OS::AllocateAlignment()));
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if (!heap()->isolate()->memory_allocator()->UncommitBlock(old_start, delta)) {
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MemoryAllocator* allocator = heap()->isolate()->memory_allocator();
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if (!allocator->UncommitBlock(old_start, delta)) {
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return false;
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}
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capacity_ = new_capacity;
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int pages_after = capacity_ / Page::kPageSize;
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int pages_after = new_capacity / Page::kPageSize;
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NewSpacePage* new_last_page =
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NewSpacePage::FromAddress(space_end - pages_after * Page::kPageSize);
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new_last_page->set_next_page(anchor());
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anchor()->set_prev_page(new_last_page);
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ASSERT((current_page_ <= first_page()) && (current_page_ >= new_last_page));
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}
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capacity_ = new_capacity;
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return true;
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}
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