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1 // Copyright 2009 the V8 project authors. All rights reserved. | 1 // Copyright 2009 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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86 // We do not allow copies of copies, so we follow one link to | 86 // We do not allow copies of copies, so we follow one link to |
87 // the actual backing store of a copy before making a copy. | 87 // the actual backing store of a copy before making a copy. |
88 index = target.index(); | 88 index = target.index(); |
89 ASSERT(elements_[index].is_memory() || elements_[index].is_register()); | 89 ASSERT(elements_[index].is_memory() || elements_[index].is_register()); |
90 // Fall through. | 90 // Fall through. |
91 | 91 |
92 case FrameElement::MEMORY: // Fall through. | 92 case FrameElement::MEMORY: // Fall through. |
93 case FrameElement::REGISTER: | 93 case FrameElement::REGISTER: |
94 // All copies are backed by memory or register locations. | 94 // All copies are backed by memory or register locations. |
95 result.type_ = | 95 result.type_ = |
96 FrameElement::TypeField::encode(FrameElement::COPY) | | 96 FrameElement::TypeField::encode(FrameElement::COPY) |
97 FrameElement::SyncField::encode(FrameElement::NOT_SYNCED); | 97 | FrameElement::IsCopiedField::encode(false) |
| 98 | FrameElement::SyncField::encode(FrameElement::NOT_SYNCED); |
98 result.data_.index_ = index; | 99 result.data_.index_ = index; |
| 100 elements_[index].set_copied(); |
99 break; | 101 break; |
100 | 102 |
101 case FrameElement::INVALID: | 103 case FrameElement::INVALID: |
102 // We should not try to copy invalid elements. | 104 // We should not try to copy invalid elements. |
103 UNREACHABLE(); | 105 UNREACHABLE(); |
104 break; | 106 break; |
105 } | 107 } |
106 return result; | 108 return result; |
107 } | 109 } |
108 | 110 |
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360 bool same_constant = original.is_constant() | 362 bool same_constant = original.is_constant() |
361 && value->is_constant() | 363 && value->is_constant() |
362 && original.handle().is_identical_to(value->handle()); | 364 && original.handle().is_identical_to(value->handle()); |
363 if (same_register || same_constant) { | 365 if (same_register || same_constant) { |
364 value->Unuse(); | 366 value->Unuse(); |
365 return; | 367 return; |
366 } | 368 } |
367 | 369 |
368 // If the original may be a copy, adjust to preserve the copy-on-write | 370 // If the original may be a copy, adjust to preserve the copy-on-write |
369 // semantics of copied elements. | 371 // semantics of copied elements. |
370 if (original.is_register() || original.is_memory()) { | 372 if (original.is_copied() && |
| 373 (original.is_register() || original.is_memory())) { |
371 FrameElement ignored = AdjustCopies(frame_index); | 374 FrameElement ignored = AdjustCopies(frame_index); |
372 } | 375 } |
373 | 376 |
374 // If the original is a register reference, deallocate it. | 377 // If the original is a register reference, deallocate it. |
375 if (original.is_register()) { | 378 if (original.is_register()) { |
376 Unuse(original.reg()); | 379 Unuse(original.reg()); |
377 } | 380 } |
378 | 381 |
379 FrameElement new_element; | 382 FrameElement new_element; |
380 if (value->is_register()) { | 383 if (value->is_register()) { |
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555 for (int i = 0; i < kNumRegisters; i++) { | 558 for (int i = 0; i < kNumRegisters; i++) { |
556 if (frame_registers_.count(i) != other->frame_registers_.count(i)) { | 559 if (frame_registers_.count(i) != other->frame_registers_.count(i)) { |
557 return false; | 560 return false; |
558 } | 561 } |
559 } | 562 } |
560 | 563 |
561 return true; | 564 return true; |
562 } | 565 } |
563 | 566 |
564 } } // namespace v8::internal | 567 } } // namespace v8::internal |
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