Line data Source code
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/shared-function-info-inl.h"
15 : #include "src/objects/template-objects.h"
16 :
17 : namespace v8 {
18 : namespace internal {
19 :
20 :
21 : // static
22 : ScriptContextTable* ScriptContextTable::cast(Object* context) {
23 : DCHECK(context->IsScriptContextTable());
24 : return reinterpret_cast<ScriptContextTable*>(context);
25 : }
26 :
27 : int ScriptContextTable::used() const { return Smi::ToInt(get(kUsedSlot)); }
28 :
29 : void ScriptContextTable::set_used(int used) {
30 : set(kUsedSlot, Smi::FromInt(used));
31 : }
32 :
33 :
34 : // static
35 10796658 : Handle<Context> ScriptContextTable::GetContext(Handle<ScriptContextTable> table,
36 : int i) {
37 : DCHECK(i < table->used());
38 : return Handle<Context>::cast(
39 10796658 : FixedArray::get(*table, i + kFirstContextSlot, table->GetIsolate()));
40 : }
41 :
42 :
43 : // static
44 214367 : Context* Context::cast(Object* context) {
45 : DCHECK(context->IsContext());
46 214367 : return reinterpret_cast<Context*>(context);
47 : }
48 :
49 :
50 22186 : JSFunction* Context::closure() { return JSFunction::cast(get(CLOSURE_INDEX)); }
51 1157468 : void Context::set_closure(JSFunction* closure) { set(CLOSURE_INDEX, closure); }
52 :
53 :
54 : Context* Context::previous() {
55 : Object* result = get(PREVIOUS_INDEX);
56 : DCHECK(IsBootstrappingOrValidParentContext(result, this));
57 : return reinterpret_cast<Context*>(result);
58 : }
59 1157516 : void Context::set_previous(Context* context) { set(PREVIOUS_INDEX, context); }
60 :
61 : Object* Context::next_context_link() { return get(Context::NEXT_CONTEXT_LINK); }
62 :
63 577592 : bool Context::has_extension() { return !extension()->IsTheHole(GetIsolate()); }
64 : HeapObject* Context::extension() {
65 : return HeapObject::cast(get(EXTENSION_INDEX));
66 : }
67 : void Context::set_extension(HeapObject* object) {
68 1263623 : set(EXTENSION_INDEX, object);
69 : }
70 :
71 : Context* Context::native_context() const {
72 : Object* result = get(NATIVE_CONTEXT_INDEX);
73 : DCHECK(IsBootstrappingOrNativeContext(this->GetIsolate(), result));
74 : return reinterpret_cast<Context*>(result);
75 : }
76 :
77 :
78 : void Context::set_native_context(Context* context) {
79 1157552 : set(NATIVE_CONTEXT_INDEX, context);
80 : }
81 :
82 30639818 : bool Context::IsNativeContext() const {
83 : Map* map = this->map();
84 30639818 : return map == map->GetHeap()->native_context_map();
85 : }
86 :
87 33475185 : bool Context::IsFunctionContext() const {
88 : Map* map = this->map();
89 33475185 : return map == map->GetHeap()->function_context_map();
90 : }
91 :
92 3405565 : bool Context::IsCatchContext() const {
93 : Map* map = this->map();
94 3405565 : return map == map->GetHeap()->catch_context_map();
95 : }
96 :
97 28108096 : bool Context::IsWithContext() const {
98 : Map* map = this->map();
99 28108096 : return map == map->GetHeap()->with_context_map();
100 : }
101 :
102 3379026 : bool Context::IsDebugEvaluateContext() const {
103 : Map* map = this->map();
104 3379026 : return map == map->GetHeap()->debug_evaluate_context_map();
105 : }
106 :
107 10860571 : bool Context::IsBlockContext() const {
108 : Map* map = this->map();
109 10860571 : return map == map->GetHeap()->block_context_map();
110 : }
111 :
112 17412122 : bool Context::IsModuleContext() const {
113 : Map* map = this->map();
114 17412122 : return map == map->GetHeap()->module_context_map();
115 : }
116 :
117 14323326 : bool Context::IsEvalContext() const {
118 : Map* map = this->map();
119 14323326 : return map == map->GetHeap()->eval_context_map();
120 : }
121 :
122 3931841 : bool Context::IsScriptContext() const {
123 : Map* map = this->map();
124 3931841 : return map == map->GetHeap()->script_context_map();
125 : }
126 :
127 4455401 : bool Context::HasSameSecurityTokenAs(Context* that) const {
128 : return this->native_context()->security_token() ==
129 4455401 : that->native_context()->security_token();
130 : }
131 :
132 : #define NATIVE_CONTEXT_FIELD_ACCESSORS(index, type, name) \
133 : void Context::set_##name(type* value) { \
134 : DCHECK(IsNativeContext()); \
135 : set(index, value); \
136 : } \
137 : bool Context::is_##name(type* value) const { \
138 : DCHECK(IsNativeContext()); \
139 : return type::cast(get(index)) == value; \
140 : } \
141 : type* Context::name() const { \
142 : DCHECK(IsNativeContext()); \
143 : return type::cast(get(index)); \
144 : }
145 6942098 : NATIVE_CONTEXT_FIELDS(NATIVE_CONTEXT_FIELD_ACCESSORS)
146 : #undef NATIVE_CONTEXT_FIELD_ACCESSORS
147 :
148 : #define CHECK_FOLLOWS2(v1, v2) STATIC_ASSERT((v1 + 1) == (v2))
149 : #define CHECK_FOLLOWS4(v1, v2, v3, v4) \
150 : CHECK_FOLLOWS2(v1, v2); \
151 : CHECK_FOLLOWS2(v2, v3); \
152 : CHECK_FOLLOWS2(v3, v4)
153 :
154 20103883 : int Context::FunctionMapIndex(LanguageMode language_mode, FunctionKind kind,
155 : bool has_prototype_slot, bool has_shared_name,
156 : bool needs_home_object) {
157 20103883 : if (IsClassConstructor(kind)) {
158 : // Like the strict function map, but with no 'name' accessor. 'name'
159 : // needs to be the last property and it is added during instantiation,
160 : // in case a static property with the same name exists"
161 : return CLASS_FUNCTION_MAP_INDEX;
162 : }
163 :
164 : int base = 0;
165 19926497 : if (IsGeneratorFunction(kind)) {
166 : CHECK_FOLLOWS4(GENERATOR_FUNCTION_MAP_INDEX,
167 : GENERATOR_FUNCTION_WITH_NAME_MAP_INDEX,
168 : GENERATOR_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX,
169 : GENERATOR_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX);
170 : CHECK_FOLLOWS4(
171 : ASYNC_GENERATOR_FUNCTION_MAP_INDEX,
172 : ASYNC_GENERATOR_FUNCTION_WITH_NAME_MAP_INDEX,
173 : ASYNC_GENERATOR_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX,
174 : ASYNC_GENERATOR_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX);
175 :
176 : base = IsAsyncFunction(kind) ? ASYNC_GENERATOR_FUNCTION_MAP_INDEX
177 14229 : : GENERATOR_FUNCTION_MAP_INDEX;
178 :
179 19912268 : } else if (IsAsyncFunction(kind)) {
180 : CHECK_FOLLOWS4(ASYNC_FUNCTION_MAP_INDEX, ASYNC_FUNCTION_WITH_NAME_MAP_INDEX,
181 : ASYNC_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX,
182 : ASYNC_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX);
183 :
184 : base = ASYNC_FUNCTION_MAP_INDEX;
185 :
186 56942666 : } else if (IsArrowFunction(kind) || IsConciseMethod(kind) ||
187 : IsAccessorFunction(kind)) {
188 : DCHECK_IMPLIES(IsArrowFunction(kind), !needs_home_object);
189 : CHECK_FOLLOWS4(STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX,
190 : METHOD_WITH_NAME_MAP_INDEX,
191 : METHOD_WITH_HOME_OBJECT_MAP_INDEX,
192 : METHOD_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX);
193 :
194 : base = STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX;
195 :
196 : } else {
197 : DCHECK(!needs_home_object);
198 : CHECK_FOLLOWS2(SLOPPY_FUNCTION_MAP_INDEX,
199 : SLOPPY_FUNCTION_WITH_NAME_MAP_INDEX);
200 : CHECK_FOLLOWS2(STRICT_FUNCTION_MAP_INDEX,
201 : STRICT_FUNCTION_WITH_NAME_MAP_INDEX);
202 :
203 : base = is_strict(language_mode) ? STRICT_FUNCTION_MAP_INDEX
204 17866092 : : SLOPPY_FUNCTION_MAP_INDEX;
205 : }
206 19926497 : int offset = static_cast<int>(!has_shared_name) |
207 19926497 : (static_cast<int>(needs_home_object) << 1);
208 : DCHECK_EQ(0, offset & ~3);
209 :
210 19926497 : return base + offset;
211 : }
212 :
213 : #undef CHECK_FOLLOWS2
214 : #undef CHECK_FOLLOWS4
215 :
216 9953868 : Map* Context::GetInitialJSArrayMap(ElementsKind kind) const {
217 : DCHECK(IsNativeContext());
218 9953868 : if (!IsFastElementsKind(kind)) return nullptr;
219 : DisallowHeapAllocation no_gc;
220 : Object* const initial_js_array_map = get(Context::ArrayMapIndex(kind));
221 : DCHECK(!initial_js_array_map->IsUndefined(GetIsolate()));
222 9953867 : return Map::cast(initial_js_array_map);
223 : }
224 :
225 : } // namespace internal
226 : } // namespace v8
227 :
228 : #endif // V8_CONTEXTS_INL_H_
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