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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/handles.h" | 7 #include "src/handles.h" |
8 | 8 |
9 namespace v8 { | 9 namespace v8 { |
10 namespace internal { | 10 namespace internal { |
11 | 11 |
| 12 #ifdef DEBUG |
| 13 bool HandleBase::IsDereferenceAllowed(DereferenceCheckMode mode) const { |
| 14 DCHECK_NOT_NULL(location_); |
| 15 Object* object = *location_; |
| 16 if (object->IsSmi()) return true; |
| 17 HeapObject* heap_object = HeapObject::cast(object); |
| 18 Heap* heap = heap_object->GetHeap(); |
| 19 Object** roots_array_start = heap->roots_array_start(); |
| 20 if (roots_array_start <= location_ && |
| 21 location_ < roots_array_start + Heap::kStrongRootListLength && |
| 22 heap->RootCanBeTreatedAsConstant( |
| 23 static_cast<Heap::RootListIndex>(location_ - roots_array_start))) { |
| 24 return true; |
| 25 } |
| 26 if (!AllowHandleDereference::IsAllowed()) return false; |
| 27 if (mode == INCLUDE_DEFERRED_CHECK && |
| 28 !AllowDeferredHandleDereference::IsAllowed()) { |
| 29 // Accessing cells, maps and internalized strings is safe. |
| 30 if (heap_object->IsCell()) return true; |
| 31 if (heap_object->IsMap()) return true; |
| 32 if (heap_object->IsInternalizedString()) return true; |
| 33 return !heap->isolate()->IsDeferredHandle(location_); |
| 34 } |
| 35 return true; |
| 36 } |
| 37 #endif |
| 38 |
| 39 |
12 int HandleScope::NumberOfHandles(Isolate* isolate) { | 40 int HandleScope::NumberOfHandles(Isolate* isolate) { |
13 HandleScopeImplementer* impl = isolate->handle_scope_implementer(); | 41 HandleScopeImplementer* impl = isolate->handle_scope_implementer(); |
14 int n = impl->blocks()->length(); | 42 int n = impl->blocks()->length(); |
15 if (n == 0) return 0; | 43 if (n == 0) return 0; |
16 return ((n - 1) * kHandleBlockSize) + static_cast<int>( | 44 return ((n - 1) * kHandleBlockSize) + static_cast<int>( |
17 (isolate->handle_scope_data()->next - impl->blocks()->last())); | 45 (isolate->handle_scope_data()->next - impl->blocks()->last())); |
18 } | 46 } |
19 | 47 |
20 | 48 |
21 Object** HandleScope::Extend(Isolate* isolate) { | 49 Object** HandleScope::Extend(Isolate* isolate) { |
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60 void HandleScope::DeleteExtensions(Isolate* isolate) { | 88 void HandleScope::DeleteExtensions(Isolate* isolate) { |
61 HandleScopeData* current = isolate->handle_scope_data(); | 89 HandleScopeData* current = isolate->handle_scope_data(); |
62 isolate->handle_scope_implementer()->DeleteExtensions(current->limit); | 90 isolate->handle_scope_implementer()->DeleteExtensions(current->limit); |
63 } | 91 } |
64 | 92 |
65 | 93 |
66 #ifdef ENABLE_HANDLE_ZAPPING | 94 #ifdef ENABLE_HANDLE_ZAPPING |
67 void HandleScope::ZapRange(Object** start, Object** end) { | 95 void HandleScope::ZapRange(Object** start, Object** end) { |
68 DCHECK(end - start <= kHandleBlockSize); | 96 DCHECK(end - start <= kHandleBlockSize); |
69 for (Object** p = start; p != end; p++) { | 97 for (Object** p = start; p != end; p++) { |
70 *reinterpret_cast<Address*>(p) = v8::internal::kHandleZapValue; | 98 *reinterpret_cast<Address*>(p) = kHandleZapValue; |
71 } | 99 } |
72 } | 100 } |
73 #endif | 101 #endif |
74 | 102 |
75 | 103 |
76 Address HandleScope::current_level_address(Isolate* isolate) { | 104 Address HandleScope::current_level_address(Isolate* isolate) { |
77 return reinterpret_cast<Address>(&isolate->handle_scope_data()->level); | 105 return reinterpret_cast<Address>(&isolate->handle_scope_data()->level); |
78 } | 106 } |
79 | 107 |
80 | 108 |
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121 data->next = prev_next_; | 149 data->next = prev_next_; |
122 data->limit = prev_limit_; | 150 data->limit = prev_limit_; |
123 #ifdef DEBUG | 151 #ifdef DEBUG |
124 handles_detached_ = true; | 152 handles_detached_ = true; |
125 #endif | 153 #endif |
126 return deferred; | 154 return deferred; |
127 } | 155 } |
128 | 156 |
129 } // namespace internal | 157 } // namespace internal |
130 } // namespace v8 | 158 } // namespace v8 |
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