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| 1 // Copyright 2011 the V8 project authors. All rights reserved. | 1 // Copyright 2011 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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| 300 // 1MB aligned. Start of the body is aligned so it can accommodate | 300 // 1MB aligned. Start of the body is aligned so it can accommodate |
| 301 // any heap object. | 301 // any heap object. |
| 302 class MemoryChunk { | 302 class MemoryChunk { |
| 303 public: | 303 public: |
| 304 // Only works if the pointer is in the first kPageSize of the MemoryChunk. | 304 // Only works if the pointer is in the first kPageSize of the MemoryChunk. |
| 305 static MemoryChunk* FromAddress(Address a) { | 305 static MemoryChunk* FromAddress(Address a) { |
| 306 return reinterpret_cast<MemoryChunk*>(OffsetFrom(a) & ~kAlignmentMask); | 306 return reinterpret_cast<MemoryChunk*>(OffsetFrom(a) & ~kAlignmentMask); |
| 307 } | 307 } |
| 308 | 308 |
| 309 // Only works for addresses in pointer spaces, not data or code spaces. | 309 // Only works for addresses in pointer spaces, not data or code spaces. |
| 310 static inline MemoryChunk* FromAnyPointerAddress(Address addr); | 310 static inline MemoryChunk* FromAnyPointerAddress(Heap* heap, Address addr); |
| 311 | 311 |
| 312 Address address() { return reinterpret_cast<Address>(this); } | 312 Address address() { return reinterpret_cast<Address>(this); } |
| 313 | 313 |
| 314 bool is_valid() { return address() != NULL; } | 314 bool is_valid() { return address() != NULL; } |
| 315 | 315 |
| 316 MemoryChunk* next_chunk() const { return next_chunk_; } | 316 MemoryChunk* next_chunk() const { return next_chunk_; } |
| 317 MemoryChunk* prev_chunk() const { return prev_chunk_; } | 317 MemoryChunk* prev_chunk() const { return prev_chunk_; } |
| 318 | 318 |
| 319 void set_next_chunk(MemoryChunk* next) { next_chunk_ = next; } | 319 void set_next_chunk(MemoryChunk* next) { next_chunk_ = next; } |
| 320 void set_prev_chunk(MemoryChunk* prev) { prev_chunk_ = prev; } | 320 void set_prev_chunk(MemoryChunk* prev) { prev_chunk_ = prev; } |
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| 2896 } | 2896 } |
| 2897 // Must be small, since an iteration is used for lookup. | 2897 // Must be small, since an iteration is used for lookup. |
| 2898 static const int kMaxComments = 64; | 2898 static const int kMaxComments = 64; |
| 2899 }; | 2899 }; |
| 2900 #endif | 2900 #endif |
| 2901 | 2901 |
| 2902 | 2902 |
| 2903 } } // namespace v8::internal | 2903 } } // namespace v8::internal |
| 2904 | 2904 |
| 2905 #endif // V8_SPACES_H_ | 2905 #endif // V8_SPACES_H_ |
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