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