1 // Copyright 2015 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_CONTEXTS_INL_H_ 6 #define V8_CONTEXTS_INL_H_ 7 8 #include "src/contexts.h" 9 #include "src/heap/heap.h" 10 #include "src/objects-inl.h" 11 #include "src/objects/dictionary.h" 12 #include "src/objects/map-inl.h" 13 #include "src/objects/regexp-match-info.h" 14 #include "src/objects/scope-info.h" 15 #include "src/objects/shared-function-info-inl.h" 16 #include "src/objects/template-objects.h" 17 18 namespace v8 { 19 namespace internal { 20 21 22 // static 23 ScriptContextTable* ScriptContextTable::cast(Object* context) { 24 DCHECK(context->IsScriptContextTable()); 25 return reinterpret_cast<ScriptContextTable*>(context); 26 } 27 28 int ScriptContextTable::used() const { return Smi::ToInt(get(kUsedSlotIndex)); } 29 30 void ScriptContextTable::set_used(int used) { 31 set(kUsedSlotIndex, Smi::FromInt(used)); 32 } 33 34 35 // static 36 Handle<Context> ScriptContextTable::GetContext(Isolate* isolate, 37 Handle<ScriptContextTable> table, 38 int i) { 39 DCHECK(i < table->used()); 40 return Handle<Context>::cast( 41 FixedArray::get(*table, i + kFirstContextSlotIndex, isolate)); 42 } 43 44 // static 45 Context* Context::cast(Object* context) { 46 DCHECK(context->IsContext()); 47 return reinterpret_cast<Context*>(context); 48 } 49 50 NativeContext* NativeContext::cast(Object* context) { 51 DCHECK(context->IsNativeContext()); 52 return reinterpret_cast<NativeContext*>(context); 53 } 54 55 void Context::set_scope_info(ScopeInfo* scope_info) { 56 set(SCOPE_INFO_INDEX, scope_info); 57 } 58 59 Context* Context::previous() { 60 Object* result = get(PREVIOUS_INDEX); 61 DCHECK(IsBootstrappingOrValidParentContext(result, this)); 62 return reinterpret_cast<Context*>(result); 63 } 64 void Context::set_previous(Context* context) { set(PREVIOUS_INDEX, context); } 65 66 Object* Context::next_context_link() { return get(Context::NEXT_CONTEXT_LINK); } 67 68 bool Context::has_extension() { return !extension()->IsTheHole(); } 69 HeapObject* Context::extension() { 70 return HeapObject::cast(get(EXTENSION_INDEX)); 71 } 72 void Context::set_extension(HeapObject* object) { 73 set(EXTENSION_INDEX, object); 74 } 75 76 NativeContext* Context::native_context() const { 77 Object* result = get(NATIVE_CONTEXT_INDEX); 78 DCHECK(IsBootstrappingOrNativeContext(this->GetIsolate(), result)); 79 return reinterpret_cast<NativeContext*>(result); 80 } 81 82 void Context::set_native_context(NativeContext* context) { 83 set(NATIVE_CONTEXT_INDEX, context); 84 } 85 86 bool Context::IsFunctionContext() const { 87 return map()->instance_type() == FUNCTION_CONTEXT_TYPE; 88 } 89 90 bool Context::IsCatchContext() const { 91 return map()->instance_type() == CATCH_CONTEXT_TYPE; 92 } 93 94 bool Context::IsWithContext() const { 95 return map()->instance_type() == WITH_CONTEXT_TYPE; 96 } 97 98 bool Context::IsDebugEvaluateContext() const { 99 return map()->instance_type() == DEBUG_EVALUATE_CONTEXT_TYPE; 100 } 101 102 bool Context::IsBlockContext() const { 103 return map()->instance_type() == BLOCK_CONTEXT_TYPE; 104 } 105 106 bool Context::IsModuleContext() const { 107 return map()->instance_type() == MODULE_CONTEXT_TYPE; 108 } 109 110 bool Context::IsEvalContext() const { 111 return map()->instance_type() == EVAL_CONTEXT_TYPE; 112 } 113 114 bool Context::IsScriptContext() const { 115 return map()->instance_type() == SCRIPT_CONTEXT_TYPE; 116 } 117 118 bool Context::HasSameSecurityTokenAs(Context* that) const { 119 return this->native_context()->security_token() == 120 that->native_context()->security_token(); 121 } 122 123 #define NATIVE_CONTEXT_FIELD_ACCESSORS(index, type, name) \ 124 void Context::set_##name(type* value) { \ 125 DCHECK(IsNativeContext()); \ 126 set(index, value); \ 127 } \ 128 bool Context::is_##name(type* value) const { \ 129 DCHECK(IsNativeContext()); \ 130 return type::cast(get(index)) == value; \ 131 } \ 132 type* Context::name() const { \ 133 DCHECK(IsNativeContext()); \ 134 return type::cast(get(index)); \ 135 } 136 NATIVE_CONTEXT_FIELDS(NATIVE_CONTEXT_FIELD_ACCESSORS) 137 #undef NATIVE_CONTEXT_FIELD_ACCESSORS 138 139 #define CHECK_FOLLOWS2(v1, v2) STATIC_ASSERT((v1 + 1) == (v2)) 140 #define CHECK_FOLLOWS4(v1, v2, v3, v4) \ 141 CHECK_FOLLOWS2(v1, v2); \ 142 CHECK_FOLLOWS2(v2, v3); \ 143 CHECK_FOLLOWS2(v3, v4) 144 145 int Context::FunctionMapIndex(LanguageMode language_mode, FunctionKind kind, 146 bool has_prototype_slot, bool has_shared_name, 147 bool needs_home_object) { 148 if (IsClassConstructor(kind)) { 149 // Like the strict function map, but with no 'name' accessor. 'name' 150 // needs to be the last property and it is added during instantiation, 151 // in case a static property with the same name exists" 152 return CLASS_FUNCTION_MAP_INDEX; 153 } 154 155 int base = 0; 156 if (IsGeneratorFunction(kind)) { 157 CHECK_FOLLOWS4(GENERATOR_FUNCTION_MAP_INDEX, 158 GENERATOR_FUNCTION_WITH_NAME_MAP_INDEX, 159 GENERATOR_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX, 160 GENERATOR_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX); 161 CHECK_FOLLOWS4( 162 ASYNC_GENERATOR_FUNCTION_MAP_INDEX, 163 ASYNC_GENERATOR_FUNCTION_WITH_NAME_MAP_INDEX, 164 ASYNC_GENERATOR_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX, 165 ASYNC_GENERATOR_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX); 166 167 base = IsAsyncFunction(kind) ? ASYNC_GENERATOR_FUNCTION_MAP_INDEX 168 : GENERATOR_FUNCTION_MAP_INDEX; 169 170 } else if (IsAsyncFunction(kind)) { 171 CHECK_FOLLOWS4(ASYNC_FUNCTION_MAP_INDEX, ASYNC_FUNCTION_WITH_NAME_MAP_INDEX, 172 ASYNC_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX, 173 ASYNC_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX); 174 175 base = ASYNC_FUNCTION_MAP_INDEX; 176 177 } else if (IsArrowFunction(kind) || IsConciseMethod(kind) || 178 IsAccessorFunction(kind)) { 179 DCHECK_IMPLIES(IsArrowFunction(kind), !needs_home_object); 180 CHECK_FOLLOWS4(STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX, 181 METHOD_WITH_NAME_MAP_INDEX, 182 METHOD_WITH_HOME_OBJECT_MAP_INDEX, 183 METHOD_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX); 184 185 base = STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX; 186 187 } else { 188 DCHECK(!needs_home_object); 189 CHECK_FOLLOWS2(SLOPPY_FUNCTION_MAP_INDEX, 190 SLOPPY_FUNCTION_WITH_NAME_MAP_INDEX); 191 CHECK_FOLLOWS2(STRICT_FUNCTION_MAP_INDEX, 192 STRICT_FUNCTION_WITH_NAME_MAP_INDEX); 193 194 base = is_strict(language_mode) ? STRICT_FUNCTION_MAP_INDEX 195 : SLOPPY_FUNCTION_MAP_INDEX; 196 } 197 int offset = static_cast<int>(!has_shared_name) | 198 (static_cast<int>(needs_home_object) << 1); 199 DCHECK_EQ(0, offset & ~3); 200 201 return base + offset; 202 } 203 204 #undef CHECK_FOLLOWS2 205 #undef CHECK_FOLLOWS4 206 207 Map* Context::GetInitialJSArrayMap(ElementsKind kind) const { 208 DCHECK(IsNativeContext()); 209 if (!IsFastElementsKind(kind)) return nullptr; 210 DisallowHeapAllocation no_gc; 211 Object* const initial_js_array_map = get(Context::ArrayMapIndex(kind)); 212 DCHECK(!initial_js_array_map->IsUndefined()); 213 return Map::cast(initial_js_array_map); 214 } 215 216 } // namespace internal 217 } // namespace v8 218 219 #endif // V8_CONTEXTS_INL_H_ 220
