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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/heap/heap.h" | 5 #include "src/heap/heap.h" |
6 | 6 |
7 #include "src/accessors.h" | 7 #include "src/accessors.h" |
8 #include "src/api.h" | 8 #include "src/api.h" |
9 #include "src/ast/scopeinfo.h" | 9 #include "src/ast/scopeinfo.h" |
10 #include "src/base/bits.h" | 10 #include "src/base/bits.h" |
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3129 const int element_size = object->IsFixedArray() ? kPointerSize : kDoubleSize; | 3129 const int element_size = object->IsFixedArray() ? kPointerSize : kDoubleSize; |
3130 const int bytes_to_trim = elements_to_trim * element_size; | 3130 const int bytes_to_trim = elements_to_trim * element_size; |
3131 Map* map = object->map(); | 3131 Map* map = object->map(); |
3132 | 3132 |
3133 // For now this trick is only applied to objects in new and paged space. | 3133 // For now this trick is only applied to objects in new and paged space. |
3134 // In large object space the object's start must coincide with chunk | 3134 // In large object space the object's start must coincide with chunk |
3135 // and thus the trick is just not applicable. | 3135 // and thus the trick is just not applicable. |
3136 DCHECK(!lo_space()->Contains(object)); | 3136 DCHECK(!lo_space()->Contains(object)); |
3137 DCHECK(object->map() != fixed_cow_array_map()); | 3137 DCHECK(object->map() != fixed_cow_array_map()); |
3138 | 3138 |
| 3139 // Ensure that the no handle-scope has more than one pointer to the same |
| 3140 // backing-store. |
| 3141 SLOW_DCHECK(CountHandlesForObject(object) <= 1); |
| 3142 |
3139 STATIC_ASSERT(FixedArrayBase::kMapOffset == 0); | 3143 STATIC_ASSERT(FixedArrayBase::kMapOffset == 0); |
3140 STATIC_ASSERT(FixedArrayBase::kLengthOffset == kPointerSize); | 3144 STATIC_ASSERT(FixedArrayBase::kLengthOffset == kPointerSize); |
3141 STATIC_ASSERT(FixedArrayBase::kHeaderSize == 2 * kPointerSize); | 3145 STATIC_ASSERT(FixedArrayBase::kHeaderSize == 2 * kPointerSize); |
3142 | 3146 |
3143 const int len = object->length(); | 3147 const int len = object->length(); |
3144 DCHECK(elements_to_trim <= len); | 3148 DCHECK(elements_to_trim <= len); |
3145 | 3149 |
3146 // Calculate location of new array start. | 3150 // Calculate location of new array start. |
3147 Address new_start = object->address() + bytes_to_trim; | 3151 Address new_start = object->address() + bytes_to_trim; |
3148 | 3152 |
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5652 | 5656 |
5653 | 5657 |
5654 void Heap::PrintHandles() { | 5658 void Heap::PrintHandles() { |
5655 PrintF("Handles:\n"); | 5659 PrintF("Handles:\n"); |
5656 PrintHandleVisitor v; | 5660 PrintHandleVisitor v; |
5657 isolate_->handle_scope_implementer()->Iterate(&v); | 5661 isolate_->handle_scope_implementer()->Iterate(&v); |
5658 } | 5662 } |
5659 | 5663 |
5660 #endif | 5664 #endif |
5661 | 5665 |
| 5666 #ifdef ENABLE_SLOW_DCHECKS |
| 5667 |
| 5668 class CountHandleVisitor : public ObjectVisitor { |
| 5669 public: |
| 5670 explicit CountHandleVisitor(Object* object) : object_(object) {} |
| 5671 |
| 5672 void VisitPointers(Object** start, Object** end) override { |
| 5673 for (Object** p = start; p < end; p++) { |
| 5674 if (object_ == reinterpret_cast<Object*>(*p)) count_++; |
| 5675 } |
| 5676 } |
| 5677 |
| 5678 int count() { return count_; } |
| 5679 |
| 5680 private: |
| 5681 Object* object_; |
| 5682 int count_ = 0; |
| 5683 }; |
| 5684 |
| 5685 int Heap::CountHandlesForObject(Object* object) { |
| 5686 CountHandleVisitor v(object); |
| 5687 isolate_->handle_scope_implementer()->Iterate(&v); |
| 5688 return v.count(); |
| 5689 } |
| 5690 #endif |
| 5691 |
5662 class CheckHandleCountVisitor : public ObjectVisitor { | 5692 class CheckHandleCountVisitor : public ObjectVisitor { |
5663 public: | 5693 public: |
5664 CheckHandleCountVisitor() : handle_count_(0) {} | 5694 CheckHandleCountVisitor() : handle_count_(0) {} |
5665 ~CheckHandleCountVisitor() override { | 5695 ~CheckHandleCountVisitor() override { |
5666 CHECK(handle_count_ < HandleScope::kCheckHandleThreshold); | 5696 CHECK(handle_count_ < HandleScope::kCheckHandleThreshold); |
5667 } | 5697 } |
5668 void VisitPointers(Object** start, Object** end) override { | 5698 void VisitPointers(Object** start, Object** end) override { |
5669 handle_count_ += end - start; | 5699 handle_count_ += end - start; |
5670 } | 5700 } |
5671 | 5701 |
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6382 } | 6412 } |
6383 | 6413 |
6384 | 6414 |
6385 // static | 6415 // static |
6386 int Heap::GetStaticVisitorIdForMap(Map* map) { | 6416 int Heap::GetStaticVisitorIdForMap(Map* map) { |
6387 return StaticVisitorBase::GetVisitorId(map); | 6417 return StaticVisitorBase::GetVisitorId(map); |
6388 } | 6418 } |
6389 | 6419 |
6390 } // namespace internal | 6420 } // namespace internal |
6391 } // namespace v8 | 6421 } // namespace v8 |
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