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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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| 63 const int kPageShift = kOffsetShift + kOffsetBits; | 63 const int kPageShift = kOffsetShift + kOffsetBits; |
| 64 const int kPageBits = 32 - (kOffsetBits + kSpaceBits + kHeapObjectTagSize); | 64 const int kPageBits = 32 - (kOffsetBits + kSpaceBits + kHeapObjectTagSize); |
| 65 const int kPageMask = (1 << kPageBits) - 1; | 65 const int kPageMask = (1 << kPageBits) - 1; |
| 66 | 66 |
| 67 const int kPageAndOffsetShift = kOffsetShift; | 67 const int kPageAndOffsetShift = kOffsetShift; |
| 68 const int kPageAndOffsetBits = kPageBits + kOffsetBits; | 68 const int kPageAndOffsetBits = kPageBits + kOffsetBits; |
| 69 const int kPageAndOffsetMask = (1 << kPageAndOffsetBits) - 1; | 69 const int kPageAndOffsetMask = (1 << kPageAndOffsetBits) - 1; |
| 70 | 70 |
| 71 // These values are special allocation space tags used for | 71 // These values are special allocation space tags used for |
| 72 // serialization. | 72 // serialization. |
| 73 // Mar the pages executable on platforms that support it. | 73 // Mark the pages executable on platforms that support it. |
| 74 const int kLargeCode = LAST_SPACE + 1; | 74 const int kLargeCode = LAST_SPACE + 1; |
| 75 // Allocate extra remembered-set bits. | 75 // Allocate extra remembered-set bits. |
| 76 const int kLargeFixedArray = LAST_SPACE + 2; | 76 const int kLargeFixedArray = LAST_SPACE + 2; |
| 77 | 77 |
| 78 | 78 |
| 79 static inline AllocationSpace GetSpace(Address addr) { | 79 static inline AllocationSpace GetSpace(Address addr) { |
| 80 const intptr_t encoded = reinterpret_cast<intptr_t>(addr); | 80 const intptr_t encoded = reinterpret_cast<intptr_t>(addr); |
| 81 int space_number = (static_cast<int>(encoded >> kSpaceShift) & kSpaceMask); | 81 int space_number = (static_cast<int>(encoded >> kSpaceShift) & kSpaceMask); |
| 82 if (space_number > LAST_SPACE) space_number = LO_SPACE; | 82 if (space_number > LAST_SPACE) space_number = LO_SPACE; |
| 83 return static_cast<AllocationSpace>(space_number); | 83 return static_cast<AllocationSpace>(space_number); |
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| 1694 ASSERT(index < large_objects_.length()); | 1694 ASSERT(index < large_objects_.length()); |
| 1695 } | 1695 } |
| 1696 return large_objects_[index]; // s.page_offset() is ignored. | 1696 return large_objects_[index]; // s.page_offset() is ignored. |
| 1697 } | 1697 } |
| 1698 UNREACHABLE(); | 1698 UNREACHABLE(); |
| 1699 return NULL; | 1699 return NULL; |
| 1700 } | 1700 } |
| 1701 | 1701 |
| 1702 | 1702 |
| 1703 } } // namespace v8::internal | 1703 } } // namespace v8::internal |
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