Line data    Source code

       1             : // Copyright 2018 the V8 project authors. All rights reserved.
       2             : // Use of this source code is governed by a BSD-style license that can be
       3             : // found in the LICENSE file.
       4             : 
       5             : #ifndef V8_HEAP_LOCAL_ALLOCATOR_INL_H_
       6             : #define V8_HEAP_LOCAL_ALLOCATOR_INL_H_
       7             : 
       8             : #include "src/heap/local-allocator.h"
       9             : 
      10             : #include "src/heap/spaces-inl.h"
      11             : 
      12             : namespace v8 {
      13             : namespace internal {
      14             : 
      15   175646186 : AllocationResult LocalAllocator::Allocate(AllocationSpace space,
      16             :                                           int object_size,
      17             :                                           AllocationAlignment alignment) {
      18   175646186 :   switch (space) {
      19             :     case NEW_SPACE:
      20    90001070 :       return AllocateInNewSpace(object_size, alignment);
      21             :     case OLD_SPACE:
      22             :       return compaction_spaces_.Get(OLD_SPACE)->AllocateRaw(object_size,
      23    85643340 :                                                             alignment);
      24             :     case CODE_SPACE:
      25             :       return compaction_spaces_.Get(CODE_SPACE)
      26        1776 :           ->AllocateRaw(object_size, alignment);
      27             :     default:
      28           0 :       UNREACHABLE();
      29             :       break;
      30             :   }
      31             : }
      32             : 
      33       28876 : void LocalAllocator::FreeLast(AllocationSpace space, HeapObject object,
      34             :                               int object_size) {
      35       28876 :   switch (space) {
      36             :     case NEW_SPACE:
      37       80600 :       FreeLastInNewSpace(object, object_size);
      38           0 :       return;
      39             :     case OLD_SPACE:
      40      178387 :       FreeLastInOldSpace(object, object_size);
      41       28876 :       return;
      42             :     default:
      43             :       // Only new and old space supported.
      44           0 :       UNREACHABLE();
      45             :       break;
      46             :   }
      47             : }
      48             : 
      49       80600 : void LocalAllocator::FreeLastInNewSpace(HeapObject object, int object_size) {
      50       80600 :   if (!new_space_lab_.TryFreeLast(object, object_size)) {
      51             :     // We couldn't free the last object so we have to write a proper filler.
      52           9 :     heap_->CreateFillerObjectAt(object->address(), object_size,
      53           9 :                                 ClearRecordedSlots::kNo);
      54             :   }
      55       80600 : }
      56             : 
      57      178341 : void LocalAllocator::FreeLastInOldSpace(HeapObject object, int object_size) {
      58      178341 :   if (!compaction_spaces_.Get(OLD_SPACE)->TryFreeLast(object, object_size)) {
      59             :     // We couldn't free the last object so we have to write a proper filler.
      60           0 :     heap_->CreateFillerObjectAt(object->address(), object_size,
      61           0 :                                 ClearRecordedSlots::kNo);
      62             :   }
      63      178341 : }
      64             : 
      65    89671936 : AllocationResult LocalAllocator::AllocateInLAB(int object_size,
      66             :                                                AllocationAlignment alignment) {
      67             :   AllocationResult allocation;
      68    89671936 :   if (!new_space_lab_.IsValid() && !NewLocalAllocationBuffer()) {
      69             :     return AllocationResult::Retry(OLD_SPACE);
      70             :   }
      71    89668902 :   allocation = new_space_lab_.AllocateRawAligned(object_size, alignment);
      72    89546381 :   if (allocation.IsRetry()) {
      73     1842945 :     if (!NewLocalAllocationBuffer()) {
      74             :       return AllocationResult::Retry(OLD_SPACE);
      75             :     } else {
      76      123749 :       allocation = new_space_lab_.AllocateRawAligned(object_size, alignment);
      77      123747 :       CHECK(!allocation.IsRetry());
      78             :     }
      79             :   }
      80    87827183 :   return allocation;
      81             : }
      82             : 
      83     1924669 : bool LocalAllocator::NewLocalAllocationBuffer() {
      84     1924669 :   if (lab_allocation_will_fail_) return false;
      85      203736 :   LocalAllocationBuffer saved_lab_ = new_space_lab_;
      86             :   AllocationResult result =
      87      203723 :       new_space_->AllocateRawSynchronized(kLabSize, kWordAligned);
      88      407547 :   new_space_lab_ = LocalAllocationBuffer::FromResult(heap_, result, kLabSize);
      89      203766 :   if (new_space_lab_.IsValid()) {
      90             :     new_space_lab_.TryMerge(&saved_lab_);
      91      203447 :     return true;
      92             :   }
      93         319 :   new_space_lab_ = saved_lab_;
      94         319 :   lab_allocation_will_fail_ = true;
      95         319 :   return false;
      96             : }
      97             : 
      98    89980474 : AllocationResult LocalAllocator::AllocateInNewSpace(
      99             :     int object_size, AllocationAlignment alignment) {
     100    89980474 :   if (object_size > kMaxLabObjectSize) {
     101      300538 :     return new_space_->AllocateRawSynchronized(object_size, alignment);
     102             :   }
     103    89679936 :   return AllocateInLAB(object_size, alignment);
     104             : }
     105             : 
     106             : }  // namespace internal
     107             : }  // namespace v8
     108             : 
     109             : #endif  // V8_HEAP_LOCAL_ALLOCATOR_INL_H_