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| 1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #include "src/v8.h" | 5 #include "src/v8.h" |
| 6 | 6 |
| 7 #include "src/base/atomicops.h" |
| 7 #include "src/code-stubs.h" | 8 #include "src/code-stubs.h" |
| 8 #include "src/compilation-cache.h" | 9 #include "src/compilation-cache.h" |
| 9 #include "src/cpu-profiler.h" | 10 #include "src/cpu-profiler.h" |
| 10 #include "src/deoptimizer.h" | 11 #include "src/deoptimizer.h" |
| 11 #include "src/execution.h" | 12 #include "src/execution.h" |
| 12 #include "src/gdb-jit.h" | 13 #include "src/gdb-jit.h" |
| 13 #include "src/global-handles.h" | 14 #include "src/global-handles.h" |
| 14 #include "src/heap-profiler.h" | 15 #include "src/heap-profiler.h" |
| 15 #include "src/ic-inl.h" | 16 #include "src/ic-inl.h" |
| 16 #include "src/incremental-marking.h" | 17 #include "src/incremental-marking.h" |
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| 2965 static void UpdatePointer(HeapObject** address, HeapObject* object) { | 2966 static void UpdatePointer(HeapObject** address, HeapObject* object) { |
| 2966 Address new_addr = Memory::Address_at(object->address()); | 2967 Address new_addr = Memory::Address_at(object->address()); |
| 2967 | 2968 |
| 2968 // The new space sweep will overwrite the map word of dead objects | 2969 // The new space sweep will overwrite the map word of dead objects |
| 2969 // with NULL. In this case we do not need to transfer this entry to | 2970 // with NULL. In this case we do not need to transfer this entry to |
| 2970 // the store buffer which we are rebuilding. | 2971 // the store buffer which we are rebuilding. |
| 2971 // We perform the pointer update with a no barrier compare-and-swap. The | 2972 // We perform the pointer update with a no barrier compare-and-swap. The |
| 2972 // compare and swap may fail in the case where the pointer update tries to | 2973 // compare and swap may fail in the case where the pointer update tries to |
| 2973 // update garbage memory which was concurrently accessed by the sweeper. | 2974 // update garbage memory which was concurrently accessed by the sweeper. |
| 2974 if (new_addr != NULL) { | 2975 if (new_addr != NULL) { |
| 2975 NoBarrier_CompareAndSwap( | 2976 base::NoBarrier_CompareAndSwap( |
| 2976 reinterpret_cast<AtomicWord*>(address), | 2977 reinterpret_cast<base::AtomicWord*>(address), |
| 2977 reinterpret_cast<AtomicWord>(object), | 2978 reinterpret_cast<base::AtomicWord>(object), |
| 2978 reinterpret_cast<AtomicWord>(HeapObject::FromAddress(new_addr))); | 2979 reinterpret_cast<base::AtomicWord>(HeapObject::FromAddress(new_addr))); |
| 2979 } else { | 2980 } else { |
| 2980 // We have to zap this pointer, because the store buffer may overflow later, | 2981 // We have to zap this pointer, because the store buffer may overflow later, |
| 2981 // and then we have to scan the entire heap and we don't want to find | 2982 // and then we have to scan the entire heap and we don't want to find |
| 2982 // spurious newspace pointers in the old space. | 2983 // spurious newspace pointers in the old space. |
| 2983 // TODO(mstarzinger): This was changed to a sentinel value to track down | 2984 // TODO(mstarzinger): This was changed to a sentinel value to track down |
| 2984 // rare crashes, change it back to Smi::FromInt(0) later. | 2985 // rare crashes, change it back to Smi::FromInt(0) later. |
| 2985 NoBarrier_CompareAndSwap( | 2986 base::NoBarrier_CompareAndSwap( |
| 2986 reinterpret_cast<AtomicWord*>(address), | 2987 reinterpret_cast<base::AtomicWord*>(address), |
| 2987 reinterpret_cast<AtomicWord>(object), | 2988 reinterpret_cast<base::AtomicWord>(object), |
| 2988 reinterpret_cast<AtomicWord>(Smi::FromInt(0x0f100d00 >> 1))); | 2989 reinterpret_cast<base::AtomicWord>(Smi::FromInt(0x0f100d00 >> 1))); |
| 2989 } | 2990 } |
| 2990 } | 2991 } |
| 2991 | 2992 |
| 2992 | 2993 |
| 2993 static String* UpdateReferenceInExternalStringTableEntry(Heap* heap, | 2994 static String* UpdateReferenceInExternalStringTableEntry(Heap* heap, |
| 2994 Object** p) { | 2995 Object** p) { |
| 2995 MapWord map_word = HeapObject::cast(*p)->map_word(); | 2996 MapWord map_word = HeapObject::cast(*p)->map_word(); |
| 2996 | 2997 |
| 2997 if (map_word.IsForwardingAddress()) { | 2998 if (map_word.IsForwardingAddress()) { |
| 2998 return String::cast(map_word.ToForwardingAddress()); | 2999 return String::cast(map_word.ToForwardingAddress()); |
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| 4464 while (buffer != NULL) { | 4465 while (buffer != NULL) { |
| 4465 SlotsBuffer* next_buffer = buffer->next(); | 4466 SlotsBuffer* next_buffer = buffer->next(); |
| 4466 DeallocateBuffer(buffer); | 4467 DeallocateBuffer(buffer); |
| 4467 buffer = next_buffer; | 4468 buffer = next_buffer; |
| 4468 } | 4469 } |
| 4469 *buffer_address = NULL; | 4470 *buffer_address = NULL; |
| 4470 } | 4471 } |
| 4471 | 4472 |
| 4472 | 4473 |
| 4473 } } // namespace v8::internal | 4474 } } // namespace v8::internal |
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