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1 // Copyright 2006-2008 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2008 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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975 int page_extra_; | 975 int page_extra_; |
976 | 976 |
977 // Sets allocation pointer to a page bottom. | 977 // Sets allocation pointer to a page bottom. |
978 static void SetAllocationInfo(AllocationInfo* alloc_info, Page* p); | 978 static void SetAllocationInfo(AllocationInfo* alloc_info, Page* p); |
979 | 979 |
980 // Returns the top page specified by an allocation info structure. | 980 // Returns the top page specified by an allocation info structure. |
981 static Page* TopPageOf(AllocationInfo alloc_info) { | 981 static Page* TopPageOf(AllocationInfo alloc_info) { |
982 return Page::FromAllocationTop(alloc_info.limit); | 982 return Page::FromAllocationTop(alloc_info.limit); |
983 } | 983 } |
984 | 984 |
985 int CountPagesToTop() { | |
986 Page* p = Page::FromAllocationTop(allocation_info_.top); | |
987 PageIterator it(this, PageIterator::ALL_PAGES); | |
988 int counter = 1; | |
989 while (it.has_next()) { | |
990 if (it.next() == p) return counter; | |
991 counter++; | |
992 } | |
993 UNREACHABLE(); | |
994 return -1; | |
995 } | |
996 | |
985 // Expands the space by allocating a fixed number of pages. Returns false if | 997 // Expands the space by allocating a fixed number of pages. Returns false if |
986 // it cannot allocate requested number of pages from OS. Newly allocated | 998 // it cannot allocate requested number of pages from OS. Newly allocated |
987 // pages are append to the last_page; | 999 // pages are append to the last_page; |
988 bool Expand(Page* last_page); | 1000 bool Expand(Page* last_page); |
989 | 1001 |
990 // Generic fast case allocation function that tries linear allocation in | 1002 // Generic fast case allocation function that tries linear allocation in |
991 // the top page of 'alloc_info'. Returns NULL on failure. | 1003 // the top page of 'alloc_info'. Returns NULL on failure. |
992 inline HeapObject* AllocateLinearly(AllocationInfo* alloc_info, | 1004 inline HeapObject* AllocateLinearly(AllocationInfo* alloc_info, |
993 int size_in_bytes); | 1005 int size_in_bytes); |
994 | 1006 |
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1763 virtual void PrepareForMarkCompact(bool will_compact); | 1775 virtual void PrepareForMarkCompact(bool will_compact); |
1764 | 1776 |
1765 // Given an index, returns the page address. | 1777 // Given an index, returns the page address. |
1766 Address PageAddress(int page_index) { return page_addresses_[page_index]; } | 1778 Address PageAddress(int page_index) { return page_addresses_[page_index]; } |
1767 | 1779 |
1768 static const int kMaxMapPageIndex = 1 << MapWord::kMapPageIndexBits; | 1780 static const int kMaxMapPageIndex = 1 << MapWord::kMapPageIndexBits; |
1769 | 1781 |
1770 // Are map pointers encodable into map word? | 1782 // Are map pointers encodable into map word? |
1771 bool MapPointersEncodable() { | 1783 bool MapPointersEncodable() { |
1772 if (!FLAG_use_big_map_space) { | 1784 if (!FLAG_use_big_map_space) { |
1773 ASSERT(CountTotalPages() <= kMaxMapPageIndex); | 1785 ASSERT(CountPagesToTop() <= kMaxMapPageIndex); |
1774 return true; | 1786 return true; |
1775 } | 1787 } |
1776 int n_of_pages = Capacity() / Page::kObjectAreaSize; | 1788 return CountPagesToTop() <= max_map_space_pages_; |
1777 ASSERT(n_of_pages == CountTotalPages()); | |
1778 return n_of_pages <= max_map_space_pages_; | |
1779 } | 1789 } |
1780 | 1790 |
1781 // Should be called after forced sweep to find out if map space needs | 1791 // Should be called after forced sweep to find out if map space needs |
1782 // compaction. | 1792 // compaction. |
1783 bool NeedsCompaction(int live_maps) { | 1793 bool NeedsCompaction(int live_maps) { |
1784 return !MapPointersEncodable() && live_maps <= CompactionThreshold(); | 1794 return !MapPointersEncodable() && live_maps <= CompactionThreshold(); |
1785 } | 1795 } |
1786 | 1796 |
1787 Address TopAfterCompaction(int live_maps) { | 1797 Address TopAfterCompaction(int live_maps) { |
1788 ASSERT(NeedsCompaction(live_maps)); | 1798 ASSERT(NeedsCompaction(live_maps)); |
1789 | 1799 |
1790 int pages_left = live_maps / kMapsPerPage; | 1800 int pages_left = live_maps / kMapsPerPage; |
1791 PageIterator it(this, PageIterator::ALL_PAGES); | 1801 PageIterator it(this, PageIterator::ALL_PAGES); |
1792 while (pages_left-- > 0) { | 1802 while (pages_left-- > 0) { |
1803 it.has_next(); | |
Søren Thygesen Gjesse
2010/01/21 07:57:41
Please add a comment here.
| |
1793 ASSERT(it.has_next()); | 1804 ASSERT(it.has_next()); |
1794 it.next()->ClearRSet(); | 1805 it.next()->ClearRSet(); |
1795 } | 1806 } |
1807 it.has_next(); | |
Søren Thygesen Gjesse
2010/01/21 07:57:41
And here.
| |
1796 ASSERT(it.has_next()); | 1808 ASSERT(it.has_next()); |
1797 Page* top_page = it.next(); | 1809 Page* top_page = it.next(); |
1798 top_page->ClearRSet(); | 1810 top_page->ClearRSet(); |
1799 ASSERT(top_page->is_valid()); | 1811 ASSERT(top_page->is_valid()); |
1800 | 1812 |
1801 int offset = live_maps % kMapsPerPage * Map::kSize; | 1813 int offset = live_maps % kMapsPerPage * Map::kSize; |
1802 Address top = top_page->ObjectAreaStart() + offset; | 1814 Address top = top_page->ObjectAreaStart() + offset; |
1803 ASSERT(top < top_page->ObjectAreaEnd()); | 1815 ASSERT(top < top_page->ObjectAreaEnd()); |
1804 ASSERT(Contains(top)); | 1816 ASSERT(Contains(top)); |
1805 | 1817 |
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2051 | 2063 |
2052 private: | 2064 private: |
2053 LargeObjectChunk* current_; | 2065 LargeObjectChunk* current_; |
2054 HeapObjectCallback size_func_; | 2066 HeapObjectCallback size_func_; |
2055 }; | 2067 }; |
2056 | 2068 |
2057 | 2069 |
2058 } } // namespace v8::internal | 2070 } } // namespace v8::internal |
2059 | 2071 |
2060 #endif // V8_SPACES_H_ | 2072 #endif // V8_SPACES_H_ |
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