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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 // Review notes: | 5 // Review notes: |
6 // | 6 // |
7 // - The use of macros in these inline functions may seem superfluous | 7 // - The use of macros in these inline functions may seem superfluous |
8 // but it is absolutely needed to make sure gcc generates optimal | 8 // but it is absolutely needed to make sure gcc generates optimal |
9 // code. gcc is not happy when attempting to inline too deep. | 9 // code. gcc is not happy when attempting to inline too deep. |
10 // | 10 // |
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2125 | 2125 |
2126 | 2126 |
2127 void WeakCell::clear_next(Heap* heap) { | 2127 void WeakCell::clear_next(Heap* heap) { |
2128 set_next(heap->the_hole_value(), SKIP_WRITE_BARRIER); | 2128 set_next(heap->the_hole_value(), SKIP_WRITE_BARRIER); |
2129 } | 2129 } |
2130 | 2130 |
2131 | 2131 |
2132 bool WeakCell::next_cleared() { return next()->IsTheHole(); } | 2132 bool WeakCell::next_cleared() { return next()->IsTheHole(); } |
2133 | 2133 |
2134 | 2134 |
2135 int JSObject::GetHeaderSize() { return GetHeaderSize(map()->instance_type()); } | 2135 int JSObject::GetHeaderSize() { |
2136 | 2136 InstanceType type = map()->instance_type(); |
2137 | |
2138 int JSObject::GetHeaderSize(InstanceType type) { | |
2139 // Check for the most common kind of JavaScript object before | 2137 // Check for the most common kind of JavaScript object before |
2140 // falling into the generic switch. This speeds up the internal | 2138 // falling into the generic switch. This speeds up the internal |
2141 // field operations considerably on average. | 2139 // field operations considerably on average. |
2142 if (type == JS_OBJECT_TYPE) return JSObject::kHeaderSize; | 2140 if (type == JS_OBJECT_TYPE) return JSObject::kHeaderSize; |
2143 switch (type) { | 2141 switch (type) { |
2144 case JS_GENERATOR_OBJECT_TYPE: | 2142 case JS_GENERATOR_OBJECT_TYPE: |
2145 return JSGeneratorObject::kSize; | 2143 return JSGeneratorObject::kSize; |
2146 case JS_MODULE_TYPE: | 2144 case JS_MODULE_TYPE: |
2147 return JSModule::kSize; | 2145 return JSModule::kSize; |
2148 case JS_GLOBAL_PROXY_TYPE: | 2146 case JS_GLOBAL_PROXY_TYPE: |
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2185 return JSObject::kHeaderSize; | 2183 return JSObject::kHeaderSize; |
2186 case JS_MESSAGE_OBJECT_TYPE: | 2184 case JS_MESSAGE_OBJECT_TYPE: |
2187 return JSMessageObject::kSize; | 2185 return JSMessageObject::kSize; |
2188 default: | 2186 default: |
2189 UNREACHABLE(); | 2187 UNREACHABLE(); |
2190 return 0; | 2188 return 0; |
2191 } | 2189 } |
2192 } | 2190 } |
2193 | 2191 |
2194 | 2192 |
2195 int JSObject::GetInternalFieldCount(Map* map) { | 2193 int JSObject::GetInternalFieldCount() { |
2196 int instance_size = map->instance_size(); | 2194 DCHECK(1 << kPointerSizeLog2 == kPointerSize); |
2197 if (instance_size == kVariableSizeSentinel) return 0; | 2195 // Make sure to adjust for the number of in-object properties. These |
2198 InstanceType instance_type = map->instance_type(); | 2196 // properties do contribute to the size, but are not internal fields. |
2199 return ((instance_size - GetHeaderSize(instance_type)) >> kPointerSizeLog2) - | 2197 return ((Size() - GetHeaderSize()) >> kPointerSizeLog2) - |
2200 map->GetInObjectProperties(); | 2198 map()->GetInObjectProperties(); |
2201 } | 2199 } |
2202 | 2200 |
2203 | 2201 |
2204 int JSObject::GetInternalFieldCount() { return GetInternalFieldCount(map()); } | |
2205 | |
2206 | |
2207 int JSObject::GetInternalFieldOffset(int index) { | 2202 int JSObject::GetInternalFieldOffset(int index) { |
2208 DCHECK(index < GetInternalFieldCount() && index >= 0); | 2203 DCHECK(index < GetInternalFieldCount() && index >= 0); |
2209 return GetHeaderSize() + (kPointerSize * index); | 2204 return GetHeaderSize() + (kPointerSize * index); |
2210 } | 2205 } |
2211 | 2206 |
2212 | 2207 |
2213 Object* JSObject::GetInternalField(int index) { | 2208 Object* JSObject::GetInternalField(int index) { |
2214 DCHECK(index < GetInternalFieldCount() && index >= 0); | 2209 DCHECK(index < GetInternalFieldCount() && index >= 0); |
2215 // Internal objects do follow immediately after the header, whereas in-object | 2210 // Internal objects do follow immediately after the header, whereas in-object |
2216 // properties are at the end of the object. Therefore there is no need | 2211 // properties are at the end of the object. Therefore there is no need |
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5620 } | 5615 } |
5621 | 5616 |
5622 | 5617 |
5623 void Map::SetConstructor(Object* constructor, WriteBarrierMode mode) { | 5618 void Map::SetConstructor(Object* constructor, WriteBarrierMode mode) { |
5624 // Never overwrite a back pointer with a constructor. | 5619 // Never overwrite a back pointer with a constructor. |
5625 DCHECK(!constructor_or_backpointer()->IsMap()); | 5620 DCHECK(!constructor_or_backpointer()->IsMap()); |
5626 set_constructor_or_backpointer(constructor, mode); | 5621 set_constructor_or_backpointer(constructor, mode); |
5627 } | 5622 } |
5628 | 5623 |
5629 | 5624 |
5630 Handle<Map> Map::CopyInitialMap(Handle<Map> map) { | |
5631 return CopyInitialMap(map, map->instance_size(), map->GetInObjectProperties(), | |
5632 map->unused_property_fields()); | |
5633 } | |
5634 | |
5635 | |
5636 ACCESSORS(JSFunction, shared, SharedFunctionInfo, kSharedFunctionInfoOffset) | 5625 ACCESSORS(JSFunction, shared, SharedFunctionInfo, kSharedFunctionInfoOffset) |
5637 ACCESSORS(JSFunction, literals_or_bindings, FixedArray, kLiteralsOffset) | 5626 ACCESSORS(JSFunction, literals_or_bindings, FixedArray, kLiteralsOffset) |
5638 ACCESSORS(JSFunction, next_function_link, Object, kNextFunctionLinkOffset) | 5627 ACCESSORS(JSFunction, next_function_link, Object, kNextFunctionLinkOffset) |
5639 | 5628 |
5640 ACCESSORS(GlobalObject, builtins, JSBuiltinsObject, kBuiltinsOffset) | 5629 ACCESSORS(GlobalObject, builtins, JSBuiltinsObject, kBuiltinsOffset) |
5641 ACCESSORS(GlobalObject, native_context, Context, kNativeContextOffset) | 5630 ACCESSORS(GlobalObject, native_context, Context, kNativeContextOffset) |
5642 ACCESSORS(GlobalObject, global_proxy, JSObject, kGlobalProxyOffset) | 5631 ACCESSORS(GlobalObject, global_proxy, JSObject, kGlobalProxyOffset) |
5643 | 5632 |
5644 ACCESSORS(JSGlobalProxy, native_context, Object, kNativeContextOffset) | 5633 ACCESSORS(JSGlobalProxy, native_context, Object, kNativeContextOffset) |
5645 ACCESSORS(JSGlobalProxy, hash, Object, kHashOffset) | 5634 ACCESSORS(JSGlobalProxy, hash, Object, kHashOffset) |
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8143 #undef WRITE_INT64_FIELD | 8132 #undef WRITE_INT64_FIELD |
8144 #undef READ_BYTE_FIELD | 8133 #undef READ_BYTE_FIELD |
8145 #undef WRITE_BYTE_FIELD | 8134 #undef WRITE_BYTE_FIELD |
8146 #undef NOBARRIER_READ_BYTE_FIELD | 8135 #undef NOBARRIER_READ_BYTE_FIELD |
8147 #undef NOBARRIER_WRITE_BYTE_FIELD | 8136 #undef NOBARRIER_WRITE_BYTE_FIELD |
8148 | 8137 |
8149 } // namespace internal | 8138 } // namespace internal |
8150 } // namespace v8 | 8139 } // namespace v8 |
8151 | 8140 |
8152 #endif // V8_OBJECTS_INL_H_ | 8141 #endif // V8_OBJECTS_INL_H_ |
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