Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1 | // Copyright 2011 the V8 project authors. All rights reserved. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 4 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 5 | #include "src/contexts.h" |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 6 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 7 | #include "src/ast/scopeinfo.h" |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 8 | #include "src/bootstrapper.h" |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 9 | #include "src/debug/debug.h" |
| 10 | #include "src/isolate-inl.h" |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 11 | |
| 12 | namespace v8 { |
| 13 | namespace internal { |
| 14 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 15 | |
| 16 | Handle<ScriptContextTable> ScriptContextTable::Extend( |
| 17 | Handle<ScriptContextTable> table, Handle<Context> script_context) { |
| 18 | Handle<ScriptContextTable> result; |
| 19 | int used = table->used(); |
| 20 | int length = table->length(); |
| 21 | CHECK(used >= 0 && length > 0 && used < length); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 22 | if (used + kFirstContextSlot == length) { |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 23 | CHECK(length < Smi::kMaxValue / 2); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 24 | Isolate* isolate = table->GetIsolate(); |
| 25 | Handle<FixedArray> copy = |
| 26 | isolate->factory()->CopyFixedArrayAndGrow(table, length); |
| 27 | copy->set_map(isolate->heap()->script_context_table_map()); |
| 28 | result = Handle<ScriptContextTable>::cast(copy); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 29 | } else { |
| 30 | result = table; |
| 31 | } |
| 32 | result->set_used(used + 1); |
| 33 | |
| 34 | DCHECK(script_context->IsScriptContext()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 35 | result->set(used + kFirstContextSlot, *script_context); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 36 | return result; |
| 37 | } |
| 38 | |
| 39 | |
| 40 | bool ScriptContextTable::Lookup(Handle<ScriptContextTable> table, |
| 41 | Handle<String> name, LookupResult* result) { |
| 42 | for (int i = 0; i < table->used(); i++) { |
| 43 | Handle<Context> context = GetContext(table, i); |
| 44 | DCHECK(context->IsScriptContext()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 45 | Handle<ScopeInfo> scope_info(context->scope_info()); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 46 | int slot_index = ScopeInfo::ContextSlotIndex( |
| 47 | scope_info, name, &result->mode, &result->init_flag, |
| 48 | &result->maybe_assigned_flag); |
| 49 | |
| 50 | if (slot_index >= 0) { |
| 51 | result->context_index = i; |
| 52 | result->slot_index = slot_index; |
| 53 | return true; |
| 54 | } |
| 55 | } |
| 56 | return false; |
| 57 | } |
| 58 | |
| 59 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 60 | bool Context::is_declaration_context() { |
| 61 | if (IsFunctionContext() || IsNativeContext() || IsScriptContext()) { |
| 62 | return true; |
| 63 | } |
| 64 | if (!IsBlockContext()) return false; |
| 65 | Object* ext = extension(); |
| 66 | // If we have the special extension, we immediately know it must be a |
| 67 | // declaration scope. That's just a small performance shortcut. |
| 68 | return ext->IsSloppyBlockWithEvalContextExtension() |
| 69 | || ScopeInfo::cast(ext)->is_declaration_scope(); |
| 70 | } |
| 71 | |
| 72 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 73 | Context* Context::declaration_context() { |
| 74 | Context* current = this; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 75 | while (!current->is_declaration_context()) { |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 76 | current = current->previous(); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 77 | DCHECK(current->closure() == closure()); |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 78 | } |
| 79 | return current; |
| 80 | } |
| 81 | |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame^] | 82 | Context* Context::closure_context() { |
| 83 | Context* current = this; |
| 84 | while (!current->IsFunctionContext() && !current->IsScriptContext() && |
| 85 | !current->IsNativeContext()) { |
| 86 | current = current->previous(); |
| 87 | DCHECK(current->closure() == closure()); |
| 88 | } |
| 89 | return current; |
| 90 | } |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 91 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 92 | JSObject* Context::extension_object() { |
| 93 | DCHECK(IsNativeContext() || IsFunctionContext() || IsBlockContext()); |
| 94 | HeapObject* object = extension(); |
| 95 | if (object->IsTheHole()) return nullptr; |
| 96 | if (IsBlockContext()) { |
| 97 | if (!object->IsSloppyBlockWithEvalContextExtension()) return nullptr; |
| 98 | object = SloppyBlockWithEvalContextExtension::cast(object)->extension(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 99 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 100 | DCHECK(object->IsJSContextExtensionObject() || |
| 101 | (IsNativeContext() && object->IsJSGlobalObject())); |
| 102 | return JSObject::cast(object); |
| 103 | } |
| 104 | |
| 105 | |
| 106 | JSReceiver* Context::extension_receiver() { |
| 107 | DCHECK(IsNativeContext() || IsWithContext() || |
| 108 | IsFunctionContext() || IsBlockContext()); |
| 109 | return IsWithContext() ? JSReceiver::cast(extension()) : extension_object(); |
| 110 | } |
| 111 | |
| 112 | |
| 113 | ScopeInfo* Context::scope_info() { |
| 114 | DCHECK(IsModuleContext() || IsScriptContext() || IsBlockContext()); |
| 115 | HeapObject* object = extension(); |
| 116 | if (object->IsSloppyBlockWithEvalContextExtension()) { |
| 117 | DCHECK(IsBlockContext()); |
| 118 | object = SloppyBlockWithEvalContextExtension::cast(object)->scope_info(); |
| 119 | } |
| 120 | return ScopeInfo::cast(object); |
| 121 | } |
| 122 | |
| 123 | |
| 124 | String* Context::catch_name() { |
| 125 | DCHECK(IsCatchContext()); |
| 126 | return String::cast(extension()); |
| 127 | } |
| 128 | |
| 129 | |
| 130 | JSGlobalObject* Context::global_object() { |
| 131 | return JSGlobalObject::cast(native_context()->extension()); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 132 | } |
| 133 | |
| 134 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 135 | Context* Context::script_context() { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 136 | Context* current = this; |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 137 | while (!current->IsScriptContext()) { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 138 | current = current->previous(); |
| 139 | } |
| 140 | return current; |
| 141 | } |
| 142 | |
| 143 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 144 | JSObject* Context::global_proxy() { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 145 | return native_context()->global_proxy_object(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 146 | } |
| 147 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 148 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 149 | void Context::set_global_proxy(JSObject* object) { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 150 | native_context()->set_global_proxy_object(object); |
| 151 | } |
| 152 | |
| 153 | |
| 154 | /** |
| 155 | * Lookups a property in an object environment, taking the unscopables into |
| 156 | * account. This is used For HasBinding spec algorithms for ObjectEnvironment. |
| 157 | */ |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 158 | static Maybe<bool> UnscopableLookup(LookupIterator* it) { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 159 | Isolate* isolate = it->isolate(); |
| 160 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 161 | Maybe<bool> found = JSReceiver::HasProperty(it); |
| 162 | if (!found.IsJust() || !found.FromJust()) return found; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 163 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 164 | Handle<Object> unscopables; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 165 | ASSIGN_RETURN_ON_EXCEPTION_VALUE( |
| 166 | isolate, unscopables, |
| 167 | Object::GetProperty(it->GetReceiver(), |
| 168 | isolate->factory()->unscopables_symbol()), |
| 169 | Nothing<bool>()); |
| 170 | if (!unscopables->IsJSReceiver()) return Just(true); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 171 | Handle<Object> blacklist; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 172 | ASSIGN_RETURN_ON_EXCEPTION_VALUE(isolate, blacklist, |
| 173 | Object::GetProperty(unscopables, it->name()), |
| 174 | Nothing<bool>()); |
| 175 | return Just(!blacklist->BooleanValue()); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 176 | } |
| 177 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 178 | static void GetAttributesAndBindingFlags(VariableMode mode, |
| 179 | InitializationFlag init_flag, |
| 180 | PropertyAttributes* attributes, |
| 181 | BindingFlags* binding_flags) { |
| 182 | switch (mode) { |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 183 | case VAR: |
| 184 | *attributes = NONE; |
| 185 | *binding_flags = MUTABLE_IS_INITIALIZED; |
| 186 | break; |
| 187 | case LET: |
| 188 | *attributes = NONE; |
| 189 | *binding_flags = (init_flag == kNeedsInitialization) |
| 190 | ? MUTABLE_CHECK_INITIALIZED |
| 191 | : MUTABLE_IS_INITIALIZED; |
| 192 | break; |
| 193 | case CONST_LEGACY: |
| 194 | *attributes = READ_ONLY; |
| 195 | *binding_flags = (init_flag == kNeedsInitialization) |
| 196 | ? IMMUTABLE_CHECK_INITIALIZED |
| 197 | : IMMUTABLE_IS_INITIALIZED; |
| 198 | break; |
| 199 | case CONST: |
| 200 | *attributes = READ_ONLY; |
| 201 | *binding_flags = (init_flag == kNeedsInitialization) |
| 202 | ? IMMUTABLE_CHECK_INITIALIZED_HARMONY |
| 203 | : IMMUTABLE_IS_INITIALIZED_HARMONY; |
| 204 | break; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 205 | case IMPORT: |
| 206 | // TODO(ES6) |
| 207 | UNREACHABLE(); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 208 | break; |
| 209 | case DYNAMIC: |
| 210 | case DYNAMIC_GLOBAL: |
| 211 | case DYNAMIC_LOCAL: |
| 212 | case TEMPORARY: |
| 213 | // Note: Fixed context slots are statically allocated by the compiler. |
| 214 | // Statically allocated variables always have a statically known mode, |
| 215 | // which is the mode with which they were declared when added to the |
| 216 | // scope. Thus, the DYNAMIC mode (which corresponds to dynamically |
| 217 | // declared variables that were introduced through declaration nodes) |
| 218 | // must not appear here. |
| 219 | UNREACHABLE(); |
| 220 | break; |
| 221 | } |
| 222 | } |
| 223 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 224 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 225 | Handle<Object> Context::Lookup(Handle<String> name, |
| 226 | ContextLookupFlags flags, |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 227 | int* index, |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 228 | PropertyAttributes* attributes, |
| 229 | BindingFlags* binding_flags) { |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 230 | Isolate* isolate = GetIsolate(); |
| 231 | Handle<Context> context(this, isolate); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 232 | |
| 233 | bool follow_context_chain = (flags & FOLLOW_CONTEXT_CHAIN) != 0; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 234 | *index = kNotFound; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 235 | *attributes = ABSENT; |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 236 | *binding_flags = MISSING_BINDING; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 237 | |
| 238 | if (FLAG_trace_contexts) { |
| 239 | PrintF("Context::Lookup("); |
| 240 | name->ShortPrint(); |
| 241 | PrintF(")\n"); |
| 242 | } |
| 243 | |
| 244 | do { |
| 245 | if (FLAG_trace_contexts) { |
Ben Murdoch | f87a203 | 2010-10-22 12:50:53 +0100 | [diff] [blame] | 246 | PrintF(" - looking in context %p", reinterpret_cast<void*>(*context)); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 247 | if (context->IsScriptContext()) PrintF(" (script context)"); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 248 | if (context->IsNativeContext()) PrintF(" (native context)"); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 249 | PrintF("\n"); |
| 250 | } |
| 251 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 252 | // 1. Check global objects, subjects of with, and extension objects. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 253 | if ((context->IsNativeContext() || |
| 254 | (context->IsWithContext() && ((flags & SKIP_WITH_CONTEXT) == 0)) || |
| 255 | context->IsFunctionContext() || context->IsBlockContext()) && |
| 256 | context->extension_receiver() != nullptr) { |
| 257 | Handle<JSReceiver> object(context->extension_receiver()); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 258 | |
| 259 | if (context->IsNativeContext()) { |
| 260 | if (FLAG_trace_contexts) { |
| 261 | PrintF(" - trying other script contexts\n"); |
| 262 | } |
| 263 | // Try other script contexts. |
| 264 | Handle<ScriptContextTable> script_contexts( |
| 265 | context->global_object()->native_context()->script_context_table()); |
| 266 | ScriptContextTable::LookupResult r; |
| 267 | if (ScriptContextTable::Lookup(script_contexts, name, &r)) { |
| 268 | if (FLAG_trace_contexts) { |
| 269 | Handle<Context> c = ScriptContextTable::GetContext(script_contexts, |
| 270 | r.context_index); |
| 271 | PrintF("=> found property in script context %d: %p\n", |
| 272 | r.context_index, reinterpret_cast<void*>(*c)); |
| 273 | } |
| 274 | *index = r.slot_index; |
| 275 | GetAttributesAndBindingFlags(r.mode, r.init_flag, attributes, |
| 276 | binding_flags); |
| 277 | return ScriptContextTable::GetContext(script_contexts, |
| 278 | r.context_index); |
| 279 | } |
| 280 | } |
| 281 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 282 | // Context extension objects needs to behave as if they have no |
| 283 | // prototype. So even if we want to follow prototype chains, we need |
| 284 | // to only do a local lookup for context extension objects. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 285 | Maybe<PropertyAttributes> maybe = Nothing<PropertyAttributes>(); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 286 | if ((flags & FOLLOW_PROTOTYPE_CHAIN) == 0 || |
| 287 | object->IsJSContextExtensionObject()) { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 288 | maybe = JSReceiver::GetOwnPropertyAttributes(object, name); |
| 289 | } else if (context->IsWithContext()) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 290 | // A with context will never bind "this". |
| 291 | if (name->Equals(*isolate->factory()->this_string())) { |
| 292 | maybe = Just(ABSENT); |
| 293 | } else { |
| 294 | LookupIterator it(object, name); |
| 295 | Maybe<bool> found = UnscopableLookup(&it); |
| 296 | if (found.IsNothing()) { |
| 297 | maybe = Nothing<PropertyAttributes>(); |
| 298 | } else { |
| 299 | // Luckily, consumers of |maybe| only care whether the property |
| 300 | // was absent or not, so we can return a dummy |NONE| value |
| 301 | // for its attributes when it was present. |
| 302 | maybe = Just(found.FromJust() ? NONE : ABSENT); |
| 303 | } |
| 304 | } |
Ben Murdoch | 85b7179 | 2012-04-11 18:30:58 +0100 | [diff] [blame] | 305 | } else { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 306 | maybe = JSReceiver::GetPropertyAttributes(object, name); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 307 | } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 308 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 309 | if (!maybe.IsJust()) return Handle<Object>(); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 310 | DCHECK(!isolate->has_pending_exception()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 311 | *attributes = maybe.FromJust(); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 312 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 313 | if (maybe.FromJust() != ABSENT) { |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 314 | if (FLAG_trace_contexts) { |
| 315 | PrintF("=> found property in context object %p\n", |
| 316 | reinterpret_cast<void*>(*object)); |
Ben Murdoch | 85b7179 | 2012-04-11 18:30:58 +0100 | [diff] [blame] | 317 | } |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 318 | return object; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 319 | } |
| 320 | } |
| 321 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 322 | // 2. Check the context proper if it has slots. |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 323 | if (context->IsFunctionContext() || context->IsBlockContext() || |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 324 | context->IsScriptContext()) { |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 325 | // Use serialized scope information of functions and blocks to search |
| 326 | // for the context index. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 327 | Handle<ScopeInfo> scope_info(context->IsFunctionContext() |
| 328 | ? context->closure()->shared()->scope_info() |
| 329 | : context->scope_info()); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 330 | VariableMode mode; |
| 331 | InitializationFlag init_flag; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 332 | // TODO(sigurds) Figure out whether maybe_assigned_flag should |
| 333 | // be used to compute binding_flags. |
| 334 | MaybeAssignedFlag maybe_assigned_flag; |
| 335 | int slot_index = ScopeInfo::ContextSlotIndex( |
| 336 | scope_info, name, &mode, &init_flag, &maybe_assigned_flag); |
| 337 | DCHECK(slot_index < 0 || slot_index >= MIN_CONTEXT_SLOTS); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 338 | if (slot_index >= 0) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 339 | if (FLAG_trace_contexts) { |
| 340 | PrintF("=> found local in context slot %d (mode = %d)\n", |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 341 | slot_index, mode); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 342 | } |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 343 | *index = slot_index; |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 344 | GetAttributesAndBindingFlags(mode, init_flag, attributes, |
| 345 | binding_flags); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 346 | return context; |
| 347 | } |
| 348 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 349 | // Check the slot corresponding to the intermediate context holding |
| 350 | // only the function name variable. |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 351 | if (follow_context_chain && context->IsFunctionContext()) { |
| 352 | VariableMode mode; |
| 353 | int function_index = scope_info->FunctionContextSlotIndex(*name, &mode); |
| 354 | if (function_index >= 0) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 355 | if (FLAG_trace_contexts) { |
| 356 | PrintF("=> found intermediate function in context slot %d\n", |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 357 | function_index); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 358 | } |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 359 | *index = function_index; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 360 | *attributes = READ_ONLY; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 361 | DCHECK(mode == CONST_LEGACY || mode == CONST); |
| 362 | *binding_flags = (mode == CONST_LEGACY) |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 363 | ? IMMUTABLE_IS_INITIALIZED : IMMUTABLE_IS_INITIALIZED_HARMONY; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 364 | return context; |
| 365 | } |
| 366 | } |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 367 | |
| 368 | } else if (context->IsCatchContext()) { |
| 369 | // Catch contexts have the variable name in the extension slot. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 370 | if (String::Equals(name, handle(context->catch_name()))) { |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 371 | if (FLAG_trace_contexts) { |
| 372 | PrintF("=> found in catch context\n"); |
| 373 | } |
| 374 | *index = Context::THROWN_OBJECT_INDEX; |
| 375 | *attributes = NONE; |
| 376 | *binding_flags = MUTABLE_IS_INITIALIZED; |
| 377 | return context; |
| 378 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 379 | } |
| 380 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 381 | // 3. Prepare to continue with the previous (next outermost) context. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 382 | if (context->IsNativeContext() || |
| 383 | ((flags & STOP_AT_DECLARATION_SCOPE) != 0 && |
| 384 | context->is_declaration_context())) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 385 | follow_context_chain = false; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 386 | } else { |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 387 | context = Handle<Context>(context->previous(), isolate); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 388 | } |
| 389 | } while (follow_context_chain); |
| 390 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 391 | if (FLAG_trace_contexts) { |
| 392 | PrintF("=> no property/slot found\n"); |
| 393 | } |
| 394 | return Handle<Object>::null(); |
| 395 | } |
| 396 | |
| 397 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 398 | void Context::InitializeGlobalSlots() { |
| 399 | DCHECK(IsScriptContext()); |
| 400 | DisallowHeapAllocation no_gc; |
| 401 | |
| 402 | ScopeInfo* scope_info = this->scope_info(); |
| 403 | |
| 404 | int context_globals = scope_info->ContextGlobalCount(); |
| 405 | if (context_globals > 0) { |
| 406 | PropertyCell* empty_cell = GetHeap()->empty_property_cell(); |
| 407 | |
| 408 | int context_locals = scope_info->ContextLocalCount(); |
| 409 | int index = Context::MIN_CONTEXT_SLOTS + context_locals; |
| 410 | for (int i = 0; i < context_globals; i++) { |
| 411 | set(index++, empty_cell); |
| 412 | } |
| 413 | } |
| 414 | } |
| 415 | |
| 416 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 417 | void Context::AddOptimizedFunction(JSFunction* function) { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 418 | DCHECK(IsNativeContext()); |
| 419 | #ifdef ENABLE_SLOW_DCHECKS |
| 420 | if (FLAG_enable_slow_asserts) { |
| 421 | Object* element = get(OPTIMIZED_FUNCTIONS_LIST); |
| 422 | while (!element->IsUndefined()) { |
| 423 | CHECK(element != function); |
| 424 | element = JSFunction::cast(element)->next_function_link(); |
| 425 | } |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 426 | } |
| 427 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 428 | // Check that the context belongs to the weak native contexts list. |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 429 | bool found = false; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 430 | Object* context = GetHeap()->native_contexts_list(); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 431 | while (!context->IsUndefined()) { |
| 432 | if (context == this) { |
| 433 | found = true; |
| 434 | break; |
| 435 | } |
| 436 | context = Context::cast(context)->get(Context::NEXT_CONTEXT_LINK); |
| 437 | } |
| 438 | CHECK(found); |
| 439 | #endif |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 440 | |
| 441 | // If the function link field is already used then the function was |
| 442 | // enqueued as a code flushing candidate and we remove it now. |
| 443 | if (!function->next_function_link()->IsUndefined()) { |
| 444 | CodeFlusher* flusher = GetHeap()->mark_compact_collector()->code_flusher(); |
| 445 | flusher->EvictCandidate(function); |
| 446 | } |
| 447 | |
| 448 | DCHECK(function->next_function_link()->IsUndefined()); |
| 449 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 450 | function->set_next_function_link(get(OPTIMIZED_FUNCTIONS_LIST), |
| 451 | UPDATE_WEAK_WRITE_BARRIER); |
| 452 | set(OPTIMIZED_FUNCTIONS_LIST, function, UPDATE_WEAK_WRITE_BARRIER); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 453 | } |
| 454 | |
| 455 | |
| 456 | void Context::RemoveOptimizedFunction(JSFunction* function) { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 457 | DCHECK(IsNativeContext()); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 458 | Object* element = get(OPTIMIZED_FUNCTIONS_LIST); |
| 459 | JSFunction* prev = NULL; |
| 460 | while (!element->IsUndefined()) { |
| 461 | JSFunction* element_function = JSFunction::cast(element); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 462 | DCHECK(element_function->next_function_link()->IsUndefined() || |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 463 | element_function->next_function_link()->IsJSFunction()); |
| 464 | if (element_function == function) { |
| 465 | if (prev == NULL) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 466 | set(OPTIMIZED_FUNCTIONS_LIST, element_function->next_function_link(), |
| 467 | UPDATE_WEAK_WRITE_BARRIER); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 468 | } else { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 469 | prev->set_next_function_link(element_function->next_function_link(), |
| 470 | UPDATE_WEAK_WRITE_BARRIER); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 471 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 472 | element_function->set_next_function_link(GetHeap()->undefined_value(), |
| 473 | UPDATE_WEAK_WRITE_BARRIER); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 474 | return; |
| 475 | } |
| 476 | prev = element_function; |
| 477 | element = element_function->next_function_link(); |
| 478 | } |
| 479 | UNREACHABLE(); |
| 480 | } |
| 481 | |
| 482 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 483 | void Context::SetOptimizedFunctionsListHead(Object* head) { |
| 484 | DCHECK(IsNativeContext()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 485 | set(OPTIMIZED_FUNCTIONS_LIST, head, UPDATE_WEAK_WRITE_BARRIER); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 486 | } |
| 487 | |
| 488 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 489 | Object* Context::OptimizedFunctionsListHead() { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 490 | DCHECK(IsNativeContext()); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 491 | return get(OPTIMIZED_FUNCTIONS_LIST); |
| 492 | } |
| 493 | |
| 494 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 495 | void Context::AddOptimizedCode(Code* code) { |
| 496 | DCHECK(IsNativeContext()); |
| 497 | DCHECK(code->kind() == Code::OPTIMIZED_FUNCTION); |
| 498 | DCHECK(code->next_code_link()->IsUndefined()); |
| 499 | code->set_next_code_link(get(OPTIMIZED_CODE_LIST)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 500 | set(OPTIMIZED_CODE_LIST, code, UPDATE_WEAK_WRITE_BARRIER); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 501 | } |
| 502 | |
| 503 | |
| 504 | void Context::SetOptimizedCodeListHead(Object* head) { |
| 505 | DCHECK(IsNativeContext()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 506 | set(OPTIMIZED_CODE_LIST, head, UPDATE_WEAK_WRITE_BARRIER); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 507 | } |
| 508 | |
| 509 | |
| 510 | Object* Context::OptimizedCodeListHead() { |
| 511 | DCHECK(IsNativeContext()); |
| 512 | return get(OPTIMIZED_CODE_LIST); |
| 513 | } |
| 514 | |
| 515 | |
| 516 | void Context::SetDeoptimizedCodeListHead(Object* head) { |
| 517 | DCHECK(IsNativeContext()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 518 | set(DEOPTIMIZED_CODE_LIST, head, UPDATE_WEAK_WRITE_BARRIER); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 519 | } |
| 520 | |
| 521 | |
| 522 | Object* Context::DeoptimizedCodeListHead() { |
| 523 | DCHECK(IsNativeContext()); |
| 524 | return get(DEOPTIMIZED_CODE_LIST); |
| 525 | } |
| 526 | |
| 527 | |
| 528 | Handle<Object> Context::ErrorMessageForCodeGenerationFromStrings() { |
| 529 | Isolate* isolate = GetIsolate(); |
| 530 | Handle<Object> result(error_message_for_code_gen_from_strings(), isolate); |
| 531 | if (!result->IsUndefined()) return result; |
| 532 | return isolate->factory()->NewStringFromStaticChars( |
| 533 | "Code generation from strings disallowed for this context"); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 534 | } |
| 535 | |
| 536 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 537 | #define COMPARE_NAME(index, type, name) \ |
| 538 | if (string->IsOneByteEqualTo(STATIC_CHAR_VECTOR(#name))) return index; |
| 539 | |
| 540 | int Context::ImportedFieldIndexForName(Handle<String> string) { |
| 541 | NATIVE_CONTEXT_IMPORTED_FIELDS(COMPARE_NAME) |
| 542 | return kNotFound; |
| 543 | } |
| 544 | |
| 545 | |
| 546 | int Context::IntrinsicIndexForName(Handle<String> string) { |
| 547 | NATIVE_CONTEXT_INTRINSIC_FUNCTIONS(COMPARE_NAME); |
| 548 | return kNotFound; |
| 549 | } |
| 550 | |
| 551 | #undef COMPARE_NAME |
| 552 | |
| 553 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 554 | #ifdef DEBUG |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 555 | |
| 556 | bool Context::IsBootstrappingOrNativeContext(Isolate* isolate, Object* object) { |
| 557 | // During bootstrapping we allow all objects to pass as global |
| 558 | // objects. This is necessary to fix circular dependencies. |
| 559 | return isolate->heap()->gc_state() != Heap::NOT_IN_GC || |
| 560 | isolate->bootstrapper()->IsActive() || object->IsNativeContext(); |
| 561 | } |
| 562 | |
| 563 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 564 | bool Context::IsBootstrappingOrValidParentContext( |
| 565 | Object* object, Context* child) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 566 | // During bootstrapping we allow all objects to pass as |
| 567 | // contexts. This is necessary to fix circular dependencies. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 568 | if (child->GetIsolate()->bootstrapper()->IsActive()) return true; |
| 569 | if (!object->IsContext()) return false; |
| 570 | Context* context = Context::cast(object); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 571 | return context->IsNativeContext() || context->IsScriptContext() || |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 572 | context->IsModuleContext() || !child->IsModuleContext(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 573 | } |
| 574 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 575 | #endif |
| 576 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 577 | |
| 578 | void Context::IncrementErrorsThrown() { |
| 579 | DCHECK(IsNativeContext()); |
| 580 | |
| 581 | int previous_value = errors_thrown()->value(); |
| 582 | set_errors_thrown(Smi::FromInt(previous_value + 1)); |
| 583 | } |
| 584 | |
| 585 | |
| 586 | int Context::GetErrorsThrown() { return errors_thrown()->value(); } |
| 587 | |
| 588 | } // namespace internal |
| 589 | } // namespace v8 |