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 :
10 : #include "src/heap/heap-write-barrier.h"
11 : #include "src/objects-inl.h"
12 : #include "src/objects/dictionary-inl.h"
13 : #include "src/objects/fixed-array-inl.h"
14 : #include "src/objects/js-objects-inl.h"
15 : #include "src/objects/map-inl.h"
16 : #include "src/objects/regexp-match-info.h"
17 : #include "src/objects/scope-info.h"
18 : #include "src/objects/shared-function-info.h"
19 :
20 : // Has to be the last include (doesn't have include guards):
21 : #include "src/objects/object-macros.h"
22 :
23 : namespace v8 {
24 : namespace internal {
25 :
26 : OBJECT_CONSTRUCTORS_IMPL(ScriptContextTable, FixedArray)
27 : CAST_ACCESSOR(ScriptContextTable)
28 :
29 : int ScriptContextTable::used() const { return Smi::ToInt(get(kUsedSlotIndex)); }
30 :
31 : void ScriptContextTable::set_used(int used) {
32 : set(kUsedSlotIndex, Smi::FromInt(used));
33 : }
34 :
35 : // static
36 1018549 : Handle<Context> ScriptContextTable::GetContext(Isolate* isolate,
37 : Handle<ScriptContextTable> table,
38 : int i) {
39 1018549 : return handle(table->get_context(i), isolate);
40 : }
41 :
42 : Context ScriptContextTable::get_context(int i) const {
43 : DCHECK_LT(i, used());
44 13686544 : return Context::cast(this->get(i + kFirstContextSlotIndex));
45 : }
46 :
47 : OBJECT_CONSTRUCTORS_IMPL(Context, HeapObject)
48 : NEVER_READ_ONLY_SPACE_IMPL(Context)
49 : CAST_ACCESSOR(Context)
50 5511242 : SMI_ACCESSORS(Context, length, kLengthOffset)
51 :
52 : CAST_ACCESSOR(NativeContext)
53 :
54 : Object Context::get(int index) const {
55 : DCHECK_LT(static_cast<unsigned>(index),
56 : static_cast<unsigned>(this->length()));
57 646251265 : return RELAXED_READ_FIELD(*this, OffsetOfElementAt(index));
58 : }
59 :
60 : void Context::set(int index, Object value) {
61 : DCHECK_LT(static_cast<unsigned>(index),
62 : static_cast<unsigned>(this->length()));
63 : int offset = OffsetOfElementAt(index);
64 9540247 : RELAXED_WRITE_FIELD(*this, offset, value);
65 10365995 : WRITE_BARRIER(*this, offset, value);
66 : }
67 :
68 : void Context::set(int index, Object value, WriteBarrierMode mode) {
69 : DCHECK_LT(static_cast<unsigned>(index),
70 : static_cast<unsigned>(this->length()));
71 : int offset = OffsetOfElementAt(index);
72 1326076 : RELAXED_WRITE_FIELD(*this, offset, value);
73 1014136 : CONDITIONAL_WRITE_BARRIER(*this, offset, value, mode);
74 : }
75 :
76 1275540 : void Context::set_scope_info(ScopeInfo scope_info) {
77 : set(SCOPE_INFO_INDEX, scope_info);
78 1275544 : }
79 :
80 : Object Context::unchecked_previous() { return get(PREVIOUS_INDEX); }
81 :
82 : Context Context::previous() {
83 : Object result = get(PREVIOUS_INDEX);
84 : DCHECK(IsBootstrappingOrValidParentContext(result, *this));
85 : return Context::unchecked_cast(result);
86 : }
87 2551151 : void Context::set_previous(Context context) { set(PREVIOUS_INDEX, context); }
88 :
89 8560760 : Object Context::next_context_link() { return get(Context::NEXT_CONTEXT_LINK); }
90 :
91 288843 : bool Context::has_extension() { return !extension()->IsTheHole(); }
92 39062751 : HeapObject Context::extension() {
93 39062750 : return HeapObject::cast(get(EXTENSION_INDEX));
94 : }
95 2778045 : void Context::set_extension(HeapObject object) { set(EXTENSION_INDEX, object); }
96 :
97 : NativeContext Context::native_context() const {
98 : Object result = get(NATIVE_CONTEXT_INDEX);
99 : DCHECK(IsBootstrappingOrNativeContext(this->GetIsolate(), result));
100 : return NativeContext::unchecked_cast(result);
101 : }
102 :
103 1275431 : void Context::set_native_context(NativeContext context) {
104 : set(NATIVE_CONTEXT_INDEX, context);
105 1275430 : }
106 :
107 : bool Context::IsFunctionContext() const {
108 : return map()->instance_type() == FUNCTION_CONTEXT_TYPE;
109 : }
110 :
111 : bool Context::IsCatchContext() const {
112 : return map()->instance_type() == CATCH_CONTEXT_TYPE;
113 : }
114 :
115 : bool Context::IsWithContext() const {
116 : return map()->instance_type() == WITH_CONTEXT_TYPE;
117 : }
118 :
119 : bool Context::IsDebugEvaluateContext() const {
120 : return map()->instance_type() == DEBUG_EVALUATE_CONTEXT_TYPE;
121 : }
122 :
123 : bool Context::IsAwaitContext() const {
124 : return map()->instance_type() == AWAIT_CONTEXT_TYPE;
125 : }
126 :
127 : bool Context::IsBlockContext() const {
128 : return map()->instance_type() == BLOCK_CONTEXT_TYPE;
129 : }
130 :
131 : bool Context::IsModuleContext() const {
132 : return map()->instance_type() == MODULE_CONTEXT_TYPE;
133 : }
134 :
135 : bool Context::IsEvalContext() const {
136 : return map()->instance_type() == EVAL_CONTEXT_TYPE;
137 : }
138 :
139 : bool Context::IsScriptContext() const {
140 : return map()->instance_type() == SCRIPT_CONTEXT_TYPE;
141 : }
142 :
143 4968322 : bool Context::HasSameSecurityTokenAs(Context that) const {
144 14904966 : return this->native_context()->security_token() ==
145 9936644 : that->native_context()->security_token();
146 : }
147 :
148 : #define NATIVE_CONTEXT_FIELD_ACCESSORS(index, type, name) \
149 : void Context::set_##name(type value) { \
150 : DCHECK(IsNativeContext()); \
151 : set(index, value); \
152 : } \
153 : bool Context::is_##name(type value) const { \
154 : DCHECK(IsNativeContext()); \
155 : return type::cast(get(index)) == value; \
156 : } \
157 : type Context::name() const { \
158 : DCHECK(IsNativeContext()); \
159 : return type::cast(get(index)); \
160 : }
161 206198549 : NATIVE_CONTEXT_FIELDS(NATIVE_CONTEXT_FIELD_ACCESSORS)
162 : #undef NATIVE_CONTEXT_FIELD_ACCESSORS
163 :
164 : #define CHECK_FOLLOWS2(v1, v2) STATIC_ASSERT((v1 + 1) == (v2))
165 : #define CHECK_FOLLOWS4(v1, v2, v3, v4) \
166 : CHECK_FOLLOWS2(v1, v2); \
167 : CHECK_FOLLOWS2(v2, v3); \
168 : CHECK_FOLLOWS2(v3, v4)
169 :
170 18914222 : int Context::FunctionMapIndex(LanguageMode language_mode, FunctionKind kind,
171 : bool has_shared_name, bool needs_home_object) {
172 18914222 : if (IsClassConstructor(kind)) {
173 : // Like the strict function map, but with no 'name' accessor. 'name'
174 : // needs to be the last property and it is added during instantiation,
175 : // in case a static property with the same name exists"
176 : return CLASS_FUNCTION_MAP_INDEX;
177 : }
178 :
179 : int base = 0;
180 18793214 : if (IsGeneratorFunction(kind)) {
181 : CHECK_FOLLOWS4(GENERATOR_FUNCTION_MAP_INDEX,
182 : GENERATOR_FUNCTION_WITH_NAME_MAP_INDEX,
183 : GENERATOR_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX,
184 : GENERATOR_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX);
185 : CHECK_FOLLOWS4(
186 : ASYNC_GENERATOR_FUNCTION_MAP_INDEX,
187 : ASYNC_GENERATOR_FUNCTION_WITH_NAME_MAP_INDEX,
188 : ASYNC_GENERATOR_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX,
189 : ASYNC_GENERATOR_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX);
190 :
191 : base = IsAsyncFunction(kind) ? ASYNC_GENERATOR_FUNCTION_MAP_INDEX
192 12614 : : GENERATOR_FUNCTION_MAP_INDEX;
193 :
194 18780600 : } else if (IsAsyncFunction(kind)) {
195 : CHECK_FOLLOWS4(ASYNC_FUNCTION_MAP_INDEX, ASYNC_FUNCTION_WITH_NAME_MAP_INDEX,
196 : ASYNC_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX,
197 : ASYNC_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX);
198 :
199 : base = ASYNC_FUNCTION_MAP_INDEX;
200 :
201 18747878 : } else if (IsStrictFunctionWithoutPrototype(kind)) {
202 : DCHECK_IMPLIES(IsArrowFunction(kind), !needs_home_object);
203 : CHECK_FOLLOWS4(STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX,
204 : METHOD_WITH_NAME_MAP_INDEX,
205 : METHOD_WITH_HOME_OBJECT_MAP_INDEX,
206 : METHOD_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX);
207 :
208 : base = STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX;
209 :
210 : } else {
211 : DCHECK(!needs_home_object);
212 : CHECK_FOLLOWS2(SLOPPY_FUNCTION_MAP_INDEX,
213 : SLOPPY_FUNCTION_WITH_NAME_MAP_INDEX);
214 : CHECK_FOLLOWS2(STRICT_FUNCTION_MAP_INDEX,
215 : STRICT_FUNCTION_WITH_NAME_MAP_INDEX);
216 :
217 : base = is_strict(language_mode) ? STRICT_FUNCTION_MAP_INDEX
218 17083556 : : SLOPPY_FUNCTION_MAP_INDEX;
219 : }
220 18793214 : int offset = static_cast<int>(!has_shared_name) |
221 18793214 : (static_cast<int>(needs_home_object) << 1);
222 : DCHECK_EQ(0, offset & ~3);
223 :
224 18793214 : return base + offset;
225 : }
226 :
227 : #undef CHECK_FOLLOWS2
228 : #undef CHECK_FOLLOWS4
229 :
230 1862147 : Map Context::GetInitialJSArrayMap(ElementsKind kind) const {
231 : DCHECK(IsNativeContext());
232 1862147 : if (!IsFastElementsKind(kind)) return Map();
233 : DisallowHeapAllocation no_gc;
234 : Object const initial_js_array_map = get(Context::ArrayMapIndex(kind));
235 : DCHECK(!initial_js_array_map->IsUndefined());
236 : return Map::cast(initial_js_array_map);
237 : }
238 :
239 : MicrotaskQueue* NativeContext::microtask_queue() const {
240 : return reinterpret_cast<MicrotaskQueue*>(
241 11300 : READ_INTPTR_FIELD(*this, kMicrotaskQueueOffset));
242 : }
243 :
244 : void NativeContext::set_microtask_queue(MicrotaskQueue* microtask_queue) {
245 92303 : WRITE_INTPTR_FIELD(*this, kMicrotaskQueueOffset,
246 92303 : reinterpret_cast<intptr_t>(microtask_queue));
247 : }
248 :
249 : OBJECT_CONSTRUCTORS_IMPL(NativeContext, Context)
250 :
251 : } // namespace internal
252 : } // namespace v8
253 :
254 : #include "src/objects/object-macros-undef.h"
255 :
256 : #endif // V8_CONTEXTS_INL_H_
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