| // Copyright 2011 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "src/heap/store-buffer.h" |
| |
| #include <algorithm> |
| |
| #include "src/counters.h" |
| #include "src/heap/incremental-marking.h" |
| #include "src/isolate.h" |
| #include "src/objects-inl.h" |
| #include "src/v8.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| StoreBuffer::StoreBuffer(Heap* heap) |
| : heap_(heap), |
| top_(nullptr), |
| start_(nullptr), |
| limit_(nullptr), |
| virtual_memory_(nullptr) {} |
| |
| void StoreBuffer::SetUp() { |
| // Allocate 3x the buffer size, so that we can start the new store buffer |
| // aligned to 2x the size. This lets us use a bit test to detect the end of |
| // the area. |
| virtual_memory_ = new base::VirtualMemory(kStoreBufferSize * 2); |
| uintptr_t start_as_int = |
| reinterpret_cast<uintptr_t>(virtual_memory_->address()); |
| start_ = reinterpret_cast<Address*>(RoundUp(start_as_int, kStoreBufferSize)); |
| limit_ = start_ + (kStoreBufferSize / kPointerSize); |
| |
| DCHECK(reinterpret_cast<Address>(start_) >= virtual_memory_->address()); |
| DCHECK(reinterpret_cast<Address>(limit_) >= virtual_memory_->address()); |
| Address* vm_limit = reinterpret_cast<Address*>( |
| reinterpret_cast<char*>(virtual_memory_->address()) + |
| virtual_memory_->size()); |
| DCHECK(start_ <= vm_limit); |
| DCHECK(limit_ <= vm_limit); |
| USE(vm_limit); |
| DCHECK((reinterpret_cast<uintptr_t>(limit_) & kStoreBufferMask) == 0); |
| |
| if (!virtual_memory_->Commit(reinterpret_cast<Address>(start_), |
| kStoreBufferSize, |
| false)) { // Not executable. |
| V8::FatalProcessOutOfMemory("StoreBuffer::SetUp"); |
| } |
| top_ = start_; |
| } |
| |
| |
| void StoreBuffer::TearDown() { |
| delete virtual_memory_; |
| top_ = start_ = limit_ = nullptr; |
| } |
| |
| |
| void StoreBuffer::StoreBufferOverflow(Isolate* isolate) { |
| isolate->heap()->store_buffer()->MoveEntriesToRememberedSet(); |
| isolate->counters()->store_buffer_overflows()->Increment(); |
| } |
| |
| void StoreBuffer::MoveEntriesToRememberedSet() { |
| if (top_ == start_) return; |
| DCHECK(top_ <= limit_); |
| for (Address* current = start_; current < top_; current++) { |
| DCHECK(!heap_->code_space()->Contains(*current)); |
| Address addr = *current; |
| Page* page = Page::FromAnyPointerAddress(heap_, addr); |
| RememberedSet<OLD_TO_NEW>::Insert(page, addr); |
| } |
| top_ = start_; |
| } |
| |
| } // namespace internal |
| } // namespace v8 |