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| 1 // Copyright 2012 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 #include "src/scopes.h" | |
| 6 | |
| 7 #include "src/accessors.h" | |
| 8 #include "src/bootstrapper.h" | |
| 9 #include "src/messages.h" | |
| 10 #include "src/parser.h" | |
| 11 #include "src/scopeinfo.h" | |
| 12 | |
| 13 namespace v8 { | |
| 14 namespace internal { | |
| 15 | |
| 16 // ---------------------------------------------------------------------------- | |
| 17 // Implementation of LocalsMap | |
| 18 // | |
| 19 // Note: We are storing the handle locations as key values in the hash map. | |
| 20 // When inserting a new variable via Declare(), we rely on the fact that | |
| 21 // the handle location remains alive for the duration of that variable | |
| 22 // use. Because a Variable holding a handle with the same location exists | |
| 23 // this is ensured. | |
| 24 | |
| 25 VariableMap::VariableMap(Zone* zone) | |
| 26 : ZoneHashMap(ZoneHashMap::PointersMatch, 8, ZoneAllocationPolicy(zone)), | |
| 27 zone_(zone) {} | |
| 28 VariableMap::~VariableMap() {} | |
| 29 | |
| 30 | |
| 31 Variable* VariableMap::Declare(Scope* scope, const AstRawString* name, | |
| 32 VariableMode mode, Variable::Kind kind, | |
| 33 InitializationFlag initialization_flag, | |
| 34 MaybeAssignedFlag maybe_assigned_flag, | |
| 35 int declaration_group_start) { | |
| 36 // AstRawStrings are unambiguous, i.e., the same string is always represented | |
| 37 // by the same AstRawString*. | |
| 38 // FIXME(marja): fix the type of Lookup. | |
| 39 Entry* p = | |
| 40 ZoneHashMap::LookupOrInsert(const_cast<AstRawString*>(name), name->hash(), | |
| 41 ZoneAllocationPolicy(zone())); | |
| 42 if (p->value == NULL) { | |
| 43 // The variable has not been declared yet -> insert it. | |
| 44 DCHECK(p->key == name); | |
| 45 if (kind == Variable::CLASS) { | |
| 46 p->value = new (zone()) | |
| 47 ClassVariable(scope, name, mode, initialization_flag, | |
| 48 maybe_assigned_flag, declaration_group_start); | |
| 49 } else { | |
| 50 p->value = new (zone()) Variable( | |
| 51 scope, name, mode, kind, initialization_flag, maybe_assigned_flag); | |
| 52 } | |
| 53 } | |
| 54 return reinterpret_cast<Variable*>(p->value); | |
| 55 } | |
| 56 | |
| 57 | |
| 58 Variable* VariableMap::Lookup(const AstRawString* name) { | |
| 59 Entry* p = ZoneHashMap::Lookup(const_cast<AstRawString*>(name), name->hash()); | |
| 60 if (p != NULL) { | |
| 61 DCHECK(reinterpret_cast<const AstRawString*>(p->key) == name); | |
| 62 DCHECK(p->value != NULL); | |
| 63 return reinterpret_cast<Variable*>(p->value); | |
| 64 } | |
| 65 return NULL; | |
| 66 } | |
| 67 | |
| 68 | |
| 69 SloppyBlockFunctionMap::SloppyBlockFunctionMap(Zone* zone) | |
| 70 : ZoneHashMap(ZoneHashMap::PointersMatch, 8, ZoneAllocationPolicy(zone)), | |
| 71 zone_(zone) {} | |
| 72 SloppyBlockFunctionMap::~SloppyBlockFunctionMap() {} | |
| 73 | |
| 74 | |
| 75 void SloppyBlockFunctionMap::Declare(const AstRawString* name, | |
| 76 SloppyBlockFunctionStatement* stmt) { | |
| 77 // AstRawStrings are unambiguous, i.e., the same string is always represented | |
| 78 // by the same AstRawString*. | |
| 79 Entry* p = | |
| 80 ZoneHashMap::LookupOrInsert(const_cast<AstRawString*>(name), name->hash(), | |
| 81 ZoneAllocationPolicy(zone_)); | |
| 82 if (p->value == nullptr) { | |
| 83 p->value = new (zone_->New(sizeof(Vector))) Vector(zone_); | |
| 84 } | |
| 85 Vector* delegates = static_cast<Vector*>(p->value); | |
| 86 delegates->push_back(stmt); | |
| 87 } | |
| 88 | |
| 89 | |
| 90 // ---------------------------------------------------------------------------- | |
| 91 // Implementation of Scope | |
| 92 | |
| 93 Scope::Scope(Zone* zone, Scope* outer_scope, ScopeType scope_type, | |
| 94 AstValueFactory* ast_value_factory, FunctionKind function_kind) | |
| 95 : inner_scopes_(4, zone), | |
| 96 variables_(zone), | |
| 97 temps_(4, zone), | |
| 98 params_(4, zone), | |
| 99 unresolved_(16, zone), | |
| 100 decls_(4, zone), | |
| 101 module_descriptor_( | |
| 102 scope_type == MODULE_SCOPE ? ModuleDescriptor::New(zone) : NULL), | |
| 103 sloppy_block_function_map_(zone), | |
| 104 already_resolved_(false), | |
| 105 ast_value_factory_(ast_value_factory), | |
| 106 zone_(zone), | |
| 107 class_declaration_group_start_(-1) { | |
| 108 SetDefaults(scope_type, outer_scope, Handle<ScopeInfo>::null(), | |
| 109 function_kind); | |
| 110 // The outermost scope must be a script scope. | |
| 111 DCHECK(scope_type == SCRIPT_SCOPE || outer_scope != NULL); | |
| 112 DCHECK(!HasIllegalRedeclaration()); | |
| 113 } | |
| 114 | |
| 115 | |
| 116 Scope::Scope(Zone* zone, Scope* inner_scope, ScopeType scope_type, | |
| 117 Handle<ScopeInfo> scope_info, AstValueFactory* value_factory) | |
| 118 : inner_scopes_(4, zone), | |
| 119 variables_(zone), | |
| 120 temps_(4, zone), | |
| 121 params_(4, zone), | |
| 122 unresolved_(16, zone), | |
| 123 decls_(4, zone), | |
| 124 module_descriptor_(NULL), | |
| 125 sloppy_block_function_map_(zone), | |
| 126 already_resolved_(true), | |
| 127 ast_value_factory_(value_factory), | |
| 128 zone_(zone), | |
| 129 class_declaration_group_start_(-1) { | |
| 130 SetDefaults(scope_type, NULL, scope_info); | |
| 131 if (!scope_info.is_null()) { | |
| 132 num_heap_slots_ = scope_info_->ContextLength(); | |
| 133 } | |
| 134 // Ensure at least MIN_CONTEXT_SLOTS to indicate a materialized context. | |
| 135 num_heap_slots_ = Max(num_heap_slots_, | |
| 136 static_cast<int>(Context::MIN_CONTEXT_SLOTS)); | |
| 137 AddInnerScope(inner_scope); | |
| 138 } | |
| 139 | |
| 140 | |
| 141 Scope::Scope(Zone* zone, Scope* inner_scope, | |
| 142 const AstRawString* catch_variable_name, | |
| 143 AstValueFactory* value_factory) | |
| 144 : inner_scopes_(1, zone), | |
| 145 variables_(zone), | |
| 146 temps_(0, zone), | |
| 147 params_(0, zone), | |
| 148 unresolved_(0, zone), | |
| 149 decls_(0, zone), | |
| 150 module_descriptor_(NULL), | |
| 151 sloppy_block_function_map_(zone), | |
| 152 already_resolved_(true), | |
| 153 ast_value_factory_(value_factory), | |
| 154 zone_(zone), | |
| 155 class_declaration_group_start_(-1) { | |
| 156 SetDefaults(CATCH_SCOPE, NULL, Handle<ScopeInfo>::null()); | |
| 157 AddInnerScope(inner_scope); | |
| 158 ++num_var_or_const_; | |
| 159 num_heap_slots_ = Context::MIN_CONTEXT_SLOTS; | |
| 160 Variable* variable = variables_.Declare(this, | |
| 161 catch_variable_name, | |
| 162 VAR, | |
| 163 Variable::NORMAL, | |
| 164 kCreatedInitialized); | |
| 165 AllocateHeapSlot(variable); | |
| 166 } | |
| 167 | |
| 168 | |
| 169 void Scope::SetDefaults(ScopeType scope_type, Scope* outer_scope, | |
| 170 Handle<ScopeInfo> scope_info, | |
| 171 FunctionKind function_kind) { | |
| 172 outer_scope_ = outer_scope; | |
| 173 scope_type_ = scope_type; | |
| 174 is_declaration_scope_ = | |
| 175 is_eval_scope() || is_function_scope() || | |
| 176 is_module_scope() || is_script_scope(); | |
| 177 function_kind_ = function_kind; | |
| 178 scope_name_ = ast_value_factory_->empty_string(); | |
| 179 dynamics_ = nullptr; | |
| 180 receiver_ = nullptr; | |
| 181 new_target_ = nullptr; | |
| 182 function_ = nullptr; | |
| 183 arguments_ = nullptr; | |
| 184 this_function_ = nullptr; | |
| 185 illegal_redecl_ = nullptr; | |
| 186 scope_inside_with_ = false; | |
| 187 scope_contains_with_ = false; | |
| 188 scope_calls_eval_ = false; | |
| 189 scope_uses_arguments_ = false; | |
| 190 scope_uses_super_property_ = false; | |
| 191 asm_module_ = false; | |
| 192 asm_function_ = outer_scope != NULL && outer_scope->asm_module_; | |
| 193 // Inherit the language mode from the parent scope. | |
| 194 language_mode_ = outer_scope != NULL ? outer_scope->language_mode_ : SLOPPY; | |
| 195 outer_scope_calls_sloppy_eval_ = false; | |
| 196 inner_scope_calls_eval_ = false; | |
| 197 scope_nonlinear_ = false; | |
| 198 force_eager_compilation_ = false; | |
| 199 force_context_allocation_ = (outer_scope != NULL && !is_function_scope()) | |
| 200 ? outer_scope->has_forced_context_allocation() : false; | |
| 201 num_var_or_const_ = 0; | |
| 202 num_stack_slots_ = 0; | |
| 203 num_heap_slots_ = 0; | |
| 204 num_global_slots_ = 0; | |
| 205 num_modules_ = 0; | |
| 206 module_var_ = NULL; | |
| 207 arity_ = 0; | |
| 208 has_simple_parameters_ = true; | |
| 209 rest_parameter_ = NULL; | |
| 210 rest_index_ = -1; | |
| 211 scope_info_ = scope_info; | |
| 212 start_position_ = RelocInfo::kNoPosition; | |
| 213 end_position_ = RelocInfo::kNoPosition; | |
| 214 if (!scope_info.is_null()) { | |
| 215 scope_calls_eval_ = scope_info->CallsEval(); | |
| 216 language_mode_ = scope_info->language_mode(); | |
| 217 is_declaration_scope_ = scope_info->is_declaration_scope(); | |
| 218 function_kind_ = scope_info->function_kind(); | |
| 219 } | |
| 220 } | |
| 221 | |
| 222 | |
| 223 Scope* Scope::DeserializeScopeChain(Isolate* isolate, Zone* zone, | |
| 224 Context* context, Scope* script_scope) { | |
| 225 // Reconstruct the outer scope chain from a closure's context chain. | |
| 226 Scope* current_scope = NULL; | |
| 227 Scope* innermost_scope = NULL; | |
| 228 bool contains_with = false; | |
| 229 while (!context->IsNativeContext()) { | |
| 230 if (context->IsWithContext()) { | |
| 231 Scope* with_scope = new (zone) | |
| 232 Scope(zone, current_scope, WITH_SCOPE, Handle<ScopeInfo>::null(), | |
| 233 script_scope->ast_value_factory_); | |
| 234 current_scope = with_scope; | |
| 235 // All the inner scopes are inside a with. | |
| 236 contains_with = true; | |
| 237 for (Scope* s = innermost_scope; s != NULL; s = s->outer_scope()) { | |
| 238 s->scope_inside_with_ = true; | |
| 239 } | |
| 240 } else if (context->IsScriptContext()) { | |
| 241 ScopeInfo* scope_info = context->scope_info(); | |
| 242 current_scope = new (zone) Scope(zone, current_scope, SCRIPT_SCOPE, | |
| 243 Handle<ScopeInfo>(scope_info), | |
| 244 script_scope->ast_value_factory_); | |
| 245 } else if (context->IsModuleContext()) { | |
| 246 ScopeInfo* scope_info = context->module()->scope_info(); | |
| 247 current_scope = new (zone) Scope(zone, current_scope, MODULE_SCOPE, | |
| 248 Handle<ScopeInfo>(scope_info), | |
| 249 script_scope->ast_value_factory_); | |
| 250 } else if (context->IsFunctionContext()) { | |
| 251 ScopeInfo* scope_info = context->closure()->shared()->scope_info(); | |
| 252 current_scope = new (zone) Scope(zone, current_scope, FUNCTION_SCOPE, | |
| 253 Handle<ScopeInfo>(scope_info), | |
| 254 script_scope->ast_value_factory_); | |
| 255 if (scope_info->IsAsmFunction()) current_scope->asm_function_ = true; | |
| 256 if (scope_info->IsAsmModule()) current_scope->asm_module_ = true; | |
| 257 } else if (context->IsBlockContext()) { | |
| 258 ScopeInfo* scope_info = context->scope_info(); | |
| 259 current_scope = new (zone) | |
| 260 Scope(zone, current_scope, BLOCK_SCOPE, Handle<ScopeInfo>(scope_info), | |
| 261 script_scope->ast_value_factory_); | |
| 262 } else { | |
| 263 DCHECK(context->IsCatchContext()); | |
| 264 String* name = context->catch_name(); | |
| 265 current_scope = new (zone) Scope( | |
| 266 zone, current_scope, | |
| 267 script_scope->ast_value_factory_->GetString(Handle<String>(name)), | |
| 268 script_scope->ast_value_factory_); | |
| 269 } | |
| 270 if (contains_with) current_scope->RecordWithStatement(); | |
| 271 if (innermost_scope == NULL) innermost_scope = current_scope; | |
| 272 | |
| 273 // Forget about a with when we move to a context for a different function. | |
| 274 if (context->previous()->closure() != context->closure()) { | |
| 275 contains_with = false; | |
| 276 } | |
| 277 context = context->previous(); | |
| 278 } | |
| 279 | |
| 280 script_scope->AddInnerScope(current_scope); | |
| 281 script_scope->PropagateScopeInfo(false); | |
| 282 return (innermost_scope == NULL) ? script_scope : innermost_scope; | |
| 283 } | |
| 284 | |
| 285 | |
| 286 bool Scope::Analyze(ParseInfo* info) { | |
| 287 DCHECK(info->literal() != NULL); | |
| 288 DCHECK(info->scope() == NULL); | |
| 289 Scope* scope = info->literal()->scope(); | |
| 290 Scope* top = scope; | |
| 291 | |
| 292 // Traverse the scope tree up to the first unresolved scope or the global | |
| 293 // scope and start scope resolution and variable allocation from that scope. | |
| 294 while (!top->is_script_scope() && | |
| 295 !top->outer_scope()->already_resolved()) { | |
| 296 top = top->outer_scope(); | |
| 297 } | |
| 298 | |
| 299 // Allocate the variables. | |
| 300 { | |
| 301 AstNodeFactory ast_node_factory(info->ast_value_factory()); | |
| 302 if (!top->AllocateVariables(info, &ast_node_factory)) { | |
| 303 DCHECK(top->pending_error_handler_.has_pending_error()); | |
| 304 top->pending_error_handler_.ThrowPendingError(info->isolate(), | |
| 305 info->script()); | |
| 306 return false; | |
| 307 } | |
| 308 } | |
| 309 | |
| 310 #ifdef DEBUG | |
| 311 bool native = info->isolate()->bootstrapper()->IsActive(); | |
| 312 if (!info->shared_info().is_null()) { | |
| 313 Object* script = info->shared_info()->script(); | |
| 314 native = script->IsScript() && | |
| 315 Script::cast(script)->type() == Script::TYPE_NATIVE; | |
| 316 } | |
| 317 | |
| 318 if (native ? FLAG_print_builtin_scopes : FLAG_print_scopes) scope->Print(); | |
| 319 #endif | |
| 320 | |
| 321 info->set_scope(scope); | |
| 322 return true; | |
| 323 } | |
| 324 | |
| 325 | |
| 326 void Scope::Initialize() { | |
| 327 DCHECK(!already_resolved()); | |
| 328 | |
| 329 // Add this scope as a new inner scope of the outer scope. | |
| 330 if (outer_scope_ != NULL) { | |
| 331 outer_scope_->inner_scopes_.Add(this, zone()); | |
| 332 scope_inside_with_ = outer_scope_->scope_inside_with_ || is_with_scope(); | |
| 333 } else { | |
| 334 scope_inside_with_ = is_with_scope(); | |
| 335 } | |
| 336 | |
| 337 // Declare convenience variables and the receiver. | |
| 338 if (is_declaration_scope() && has_this_declaration()) { | |
| 339 bool subclass_constructor = IsSubclassConstructor(function_kind_); | |
| 340 Variable* var = variables_.Declare( | |
| 341 this, ast_value_factory_->this_string(), | |
| 342 subclass_constructor ? CONST : VAR, Variable::THIS, | |
| 343 subclass_constructor ? kNeedsInitialization : kCreatedInitialized); | |
| 344 receiver_ = var; | |
| 345 } | |
| 346 | |
| 347 if (is_function_scope() && !is_arrow_scope()) { | |
| 348 // Declare 'arguments' variable which exists in all non arrow functions. | |
| 349 // Note that it might never be accessed, in which case it won't be | |
| 350 // allocated during variable allocation. | |
| 351 variables_.Declare(this, ast_value_factory_->arguments_string(), VAR, | |
| 352 Variable::ARGUMENTS, kCreatedInitialized); | |
| 353 | |
| 354 variables_.Declare(this, ast_value_factory_->new_target_string(), CONST, | |
| 355 Variable::NORMAL, kCreatedInitialized); | |
| 356 | |
| 357 if (IsConciseMethod(function_kind_) || IsClassConstructor(function_kind_) || | |
| 358 IsAccessorFunction(function_kind_)) { | |
| 359 variables_.Declare(this, ast_value_factory_->this_function_string(), | |
| 360 CONST, Variable::NORMAL, kCreatedInitialized); | |
| 361 } | |
| 362 } | |
| 363 } | |
| 364 | |
| 365 | |
| 366 Scope* Scope::FinalizeBlockScope() { | |
| 367 DCHECK(is_block_scope()); | |
| 368 DCHECK(temps_.is_empty()); | |
| 369 DCHECK(params_.is_empty()); | |
| 370 | |
| 371 if (num_var_or_const() > 0 || | |
| 372 (is_declaration_scope() && calls_sloppy_eval())) { | |
| 373 return this; | |
| 374 } | |
| 375 | |
| 376 // Remove this scope from outer scope. | |
| 377 outer_scope()->RemoveInnerScope(this); | |
| 378 | |
| 379 // Reparent inner scopes. | |
| 380 for (int i = 0; i < inner_scopes_.length(); i++) { | |
| 381 outer_scope()->AddInnerScope(inner_scopes_[i]); | |
| 382 } | |
| 383 | |
| 384 // Move unresolved variables | |
| 385 for (int i = 0; i < unresolved_.length(); i++) { | |
| 386 outer_scope()->unresolved_.Add(unresolved_[i], zone()); | |
| 387 } | |
| 388 | |
| 389 PropagateUsageFlagsToScope(outer_scope_); | |
| 390 | |
| 391 return NULL; | |
| 392 } | |
| 393 | |
| 394 | |
| 395 void Scope::ReplaceOuterScope(Scope* outer) { | |
| 396 DCHECK_NOT_NULL(outer); | |
| 397 DCHECK_NOT_NULL(outer_scope_); | |
| 398 DCHECK(!already_resolved()); | |
| 399 DCHECK(!outer->already_resolved()); | |
| 400 DCHECK(!outer_scope_->already_resolved()); | |
| 401 outer_scope_->RemoveInnerScope(this); | |
| 402 outer->AddInnerScope(this); | |
| 403 outer_scope_ = outer; | |
| 404 } | |
| 405 | |
| 406 | |
| 407 void Scope::PropagateUsageFlagsToScope(Scope* other) { | |
| 408 DCHECK_NOT_NULL(other); | |
| 409 DCHECK(!already_resolved()); | |
| 410 DCHECK(!other->already_resolved()); | |
| 411 if (uses_arguments()) other->RecordArgumentsUsage(); | |
| 412 if (uses_super_property()) other->RecordSuperPropertyUsage(); | |
| 413 if (calls_eval()) other->RecordEvalCall(); | |
| 414 if (scope_contains_with_) other->RecordWithStatement(); | |
| 415 } | |
| 416 | |
| 417 | |
| 418 Variable* Scope::LookupLocal(const AstRawString* name) { | |
| 419 Variable* result = variables_.Lookup(name); | |
| 420 if (result != NULL || scope_info_.is_null()) { | |
| 421 return result; | |
| 422 } | |
| 423 Handle<String> name_handle = name->string(); | |
| 424 // The Scope is backed up by ScopeInfo. This means it cannot operate in a | |
| 425 // heap-independent mode, and all strings must be internalized immediately. So | |
| 426 // it's ok to get the Handle<String> here. | |
| 427 // If we have a serialized scope info, we might find the variable there. | |
| 428 // There should be no local slot with the given name. | |
| 429 DCHECK(scope_info_->StackSlotIndex(*name_handle) < 0 || is_block_scope()); | |
| 430 | |
| 431 // Check context slot lookup. | |
| 432 VariableMode mode; | |
| 433 VariableLocation location = VariableLocation::CONTEXT; | |
| 434 InitializationFlag init_flag; | |
| 435 MaybeAssignedFlag maybe_assigned_flag; | |
| 436 int index = ScopeInfo::ContextSlotIndex(scope_info_, name_handle, &mode, | |
| 437 &init_flag, &maybe_assigned_flag); | |
| 438 if (index < 0) { | |
| 439 location = VariableLocation::GLOBAL; | |
| 440 index = ScopeInfo::ContextGlobalSlotIndex(scope_info_, name_handle, &mode, | |
| 441 &init_flag, &maybe_assigned_flag); | |
| 442 } | |
| 443 if (index < 0) { | |
| 444 // Check parameters. | |
| 445 index = scope_info_->ParameterIndex(*name_handle); | |
| 446 if (index < 0) return NULL; | |
| 447 | |
| 448 mode = DYNAMIC; | |
| 449 location = VariableLocation::LOOKUP; | |
| 450 init_flag = kCreatedInitialized; | |
| 451 // Be conservative and flag parameters as maybe assigned. Better information | |
| 452 // would require ScopeInfo to serialize the maybe_assigned bit also for | |
| 453 // parameters. | |
| 454 maybe_assigned_flag = kMaybeAssigned; | |
| 455 } else { | |
| 456 DCHECK(location != VariableLocation::GLOBAL || | |
| 457 (is_script_scope() && IsDeclaredVariableMode(mode) && | |
| 458 !IsLexicalVariableMode(mode))); | |
| 459 } | |
| 460 | |
| 461 Variable::Kind kind = Variable::NORMAL; | |
| 462 if (location == VariableLocation::CONTEXT && | |
| 463 index == scope_info_->ReceiverContextSlotIndex()) { | |
| 464 kind = Variable::THIS; | |
| 465 } | |
| 466 // TODO(marja, rossberg): Correctly declare FUNCTION, CLASS, NEW_TARGET, and | |
| 467 // ARGUMENTS bindings as their corresponding Variable::Kind. | |
| 468 | |
| 469 Variable* var = variables_.Declare(this, name, mode, kind, init_flag, | |
| 470 maybe_assigned_flag); | |
| 471 var->AllocateTo(location, index); | |
| 472 return var; | |
| 473 } | |
| 474 | |
| 475 | |
| 476 Variable* Scope::LookupFunctionVar(const AstRawString* name, | |
| 477 AstNodeFactory* factory) { | |
| 478 if (function_ != NULL && function_->proxy()->raw_name() == name) { | |
| 479 return function_->proxy()->var(); | |
| 480 } else if (!scope_info_.is_null()) { | |
| 481 // If we are backed by a scope info, try to lookup the variable there. | |
| 482 VariableMode mode; | |
| 483 int index = scope_info_->FunctionContextSlotIndex(*(name->string()), &mode); | |
| 484 if (index < 0) return NULL; | |
| 485 Variable* var = new (zone()) | |
| 486 Variable(this, name, mode, Variable::NORMAL, kCreatedInitialized); | |
| 487 VariableProxy* proxy = factory->NewVariableProxy(var); | |
| 488 VariableDeclaration* declaration = factory->NewVariableDeclaration( | |
| 489 proxy, mode, this, RelocInfo::kNoPosition); | |
| 490 DeclareFunctionVar(declaration); | |
| 491 var->AllocateTo(VariableLocation::CONTEXT, index); | |
| 492 return var; | |
| 493 } else { | |
| 494 return NULL; | |
| 495 } | |
| 496 } | |
| 497 | |
| 498 | |
| 499 Variable* Scope::Lookup(const AstRawString* name) { | |
| 500 for (Scope* scope = this; | |
| 501 scope != NULL; | |
| 502 scope = scope->outer_scope()) { | |
| 503 Variable* var = scope->LookupLocal(name); | |
| 504 if (var != NULL) return var; | |
| 505 } | |
| 506 return NULL; | |
| 507 } | |
| 508 | |
| 509 | |
| 510 Variable* Scope::DeclareParameter( | |
| 511 const AstRawString* name, VariableMode mode, | |
| 512 bool is_optional, bool is_rest, bool* is_duplicate) { | |
| 513 DCHECK(!already_resolved()); | |
| 514 DCHECK(is_function_scope()); | |
| 515 DCHECK(!is_optional || !is_rest); | |
| 516 Variable* var; | |
| 517 if (mode == TEMPORARY) { | |
| 518 var = NewTemporary(name); | |
| 519 } else { | |
| 520 var = variables_.Declare(this, name, mode, Variable::NORMAL, | |
| 521 kCreatedInitialized); | |
| 522 // TODO(wingo): Avoid O(n^2) check. | |
| 523 *is_duplicate = IsDeclaredParameter(name); | |
| 524 } | |
| 525 if (!is_optional && !is_rest && arity_ == params_.length()) { | |
| 526 ++arity_; | |
| 527 } | |
| 528 if (is_rest) { | |
| 529 DCHECK_NULL(rest_parameter_); | |
| 530 rest_parameter_ = var; | |
| 531 rest_index_ = num_parameters(); | |
| 532 } | |
| 533 params_.Add(var, zone()); | |
| 534 return var; | |
| 535 } | |
| 536 | |
| 537 | |
| 538 Variable* Scope::DeclareLocal(const AstRawString* name, VariableMode mode, | |
| 539 InitializationFlag init_flag, Variable::Kind kind, | |
| 540 MaybeAssignedFlag maybe_assigned_flag, | |
| 541 int declaration_group_start) { | |
| 542 DCHECK(!already_resolved()); | |
| 543 // This function handles VAR, LET, and CONST modes. DYNAMIC variables are | |
| 544 // introduces during variable allocation, and TEMPORARY variables are | |
| 545 // allocated via NewTemporary(). | |
| 546 DCHECK(IsDeclaredVariableMode(mode)); | |
| 547 ++num_var_or_const_; | |
| 548 return variables_.Declare(this, name, mode, kind, init_flag, | |
| 549 maybe_assigned_flag, declaration_group_start); | |
| 550 } | |
| 551 | |
| 552 | |
| 553 Variable* Scope::DeclareDynamicGlobal(const AstRawString* name) { | |
| 554 DCHECK(is_script_scope()); | |
| 555 return variables_.Declare(this, | |
| 556 name, | |
| 557 DYNAMIC_GLOBAL, | |
| 558 Variable::NORMAL, | |
| 559 kCreatedInitialized); | |
| 560 } | |
| 561 | |
| 562 | |
| 563 bool Scope::RemoveUnresolved(VariableProxy* var) { | |
| 564 // Most likely (always?) any variable we want to remove | |
| 565 // was just added before, so we search backwards. | |
| 566 for (int i = unresolved_.length(); i-- > 0;) { | |
| 567 if (unresolved_[i] == var) { | |
| 568 unresolved_.Remove(i); | |
| 569 return true; | |
| 570 } | |
| 571 } | |
| 572 return false; | |
| 573 } | |
| 574 | |
| 575 | |
| 576 Variable* Scope::NewTemporary(const AstRawString* name) { | |
| 577 DCHECK(!already_resolved()); | |
| 578 Scope* scope = this->ClosureScope(); | |
| 579 Variable* var = new(zone()) Variable(scope, | |
| 580 name, | |
| 581 TEMPORARY, | |
| 582 Variable::NORMAL, | |
| 583 kCreatedInitialized); | |
| 584 scope->temps_.Add(var, zone()); | |
| 585 return var; | |
| 586 } | |
| 587 | |
| 588 | |
| 589 void Scope::AddDeclaration(Declaration* declaration) { | |
| 590 decls_.Add(declaration, zone()); | |
| 591 } | |
| 592 | |
| 593 | |
| 594 void Scope::SetIllegalRedeclaration(Expression* expression) { | |
| 595 // Record only the first illegal redeclaration. | |
| 596 if (!HasIllegalRedeclaration()) { | |
| 597 illegal_redecl_ = expression; | |
| 598 } | |
| 599 DCHECK(HasIllegalRedeclaration()); | |
| 600 } | |
| 601 | |
| 602 | |
| 603 Expression* Scope::GetIllegalRedeclaration() { | |
| 604 DCHECK(HasIllegalRedeclaration()); | |
| 605 return illegal_redecl_; | |
| 606 } | |
| 607 | |
| 608 | |
| 609 Declaration* Scope::CheckConflictingVarDeclarations() { | |
| 610 int length = decls_.length(); | |
| 611 for (int i = 0; i < length; i++) { | |
| 612 Declaration* decl = decls_[i]; | |
| 613 // We don't create a separate scope to hold the function name of a function | |
| 614 // expression, so we have to make sure not to consider it when checking for | |
| 615 // conflicts (since it's conceptually "outside" the declaration scope). | |
| 616 if (is_function_scope() && decl == function()) continue; | |
| 617 if (IsLexicalVariableMode(decl->mode()) && !is_block_scope()) continue; | |
| 618 const AstRawString* name = decl->proxy()->raw_name(); | |
| 619 | |
| 620 // Iterate through all scopes until and including the declaration scope. | |
| 621 Scope* previous = NULL; | |
| 622 Scope* current = decl->scope(); | |
| 623 // Lexical vs lexical conflicts within the same scope have already been | |
| 624 // captured in Parser::Declare. The only conflicts we still need to check | |
| 625 // are lexical vs VAR, or any declarations within a declaration block scope | |
| 626 // vs lexical declarations in its surrounding (function) scope. | |
| 627 if (IsLexicalVariableMode(decl->mode())) current = current->outer_scope_; | |
| 628 do { | |
| 629 // There is a conflict if there exists a non-VAR binding. | |
| 630 Variable* other_var = current->variables_.Lookup(name); | |
| 631 if (other_var != NULL && IsLexicalVariableMode(other_var->mode())) { | |
| 632 return decl; | |
| 633 } | |
| 634 previous = current; | |
| 635 current = current->outer_scope_; | |
| 636 } while (!previous->is_declaration_scope()); | |
| 637 } | |
| 638 return NULL; | |
| 639 } | |
| 640 | |
| 641 | |
| 642 class VarAndOrder { | |
| 643 public: | |
| 644 VarAndOrder(Variable* var, int order) : var_(var), order_(order) { } | |
| 645 Variable* var() const { return var_; } | |
| 646 int order() const { return order_; } | |
| 647 static int Compare(const VarAndOrder* a, const VarAndOrder* b) { | |
| 648 return a->order_ - b->order_; | |
| 649 } | |
| 650 | |
| 651 private: | |
| 652 Variable* var_; | |
| 653 int order_; | |
| 654 }; | |
| 655 | |
| 656 | |
| 657 void Scope::CollectStackAndContextLocals( | |
| 658 ZoneList<Variable*>* stack_locals, ZoneList<Variable*>* context_locals, | |
| 659 ZoneList<Variable*>* context_globals, | |
| 660 ZoneList<Variable*>* strong_mode_free_variables) { | |
| 661 DCHECK(stack_locals != NULL); | |
| 662 DCHECK(context_locals != NULL); | |
| 663 DCHECK(context_globals != NULL); | |
| 664 | |
| 665 // Collect temporaries which are always allocated on the stack, unless the | |
| 666 // context as a whole has forced context allocation. | |
| 667 for (int i = 0; i < temps_.length(); i++) { | |
| 668 Variable* var = temps_[i]; | |
| 669 if (var->is_used()) { | |
| 670 if (var->IsContextSlot()) { | |
| 671 DCHECK(has_forced_context_allocation()); | |
| 672 context_locals->Add(var, zone()); | |
| 673 } else if (var->IsStackLocal()) { | |
| 674 stack_locals->Add(var, zone()); | |
| 675 } else { | |
| 676 DCHECK(var->IsParameter()); | |
| 677 } | |
| 678 } | |
| 679 } | |
| 680 | |
| 681 // Collect declared local variables. | |
| 682 ZoneList<VarAndOrder> vars(variables_.occupancy(), zone()); | |
| 683 for (VariableMap::Entry* p = variables_.Start(); | |
| 684 p != NULL; | |
| 685 p = variables_.Next(p)) { | |
| 686 Variable* var = reinterpret_cast<Variable*>(p->value); | |
| 687 if (strong_mode_free_variables && var->has_strong_mode_reference() && | |
| 688 var->mode() == DYNAMIC_GLOBAL) { | |
| 689 strong_mode_free_variables->Add(var, zone()); | |
| 690 } | |
| 691 | |
| 692 if (var->is_used()) { | |
| 693 vars.Add(VarAndOrder(var, p->order), zone()); | |
| 694 } | |
| 695 } | |
| 696 vars.Sort(VarAndOrder::Compare); | |
| 697 int var_count = vars.length(); | |
| 698 for (int i = 0; i < var_count; i++) { | |
| 699 Variable* var = vars[i].var(); | |
| 700 if (var->IsStackLocal()) { | |
| 701 stack_locals->Add(var, zone()); | |
| 702 } else if (var->IsContextSlot()) { | |
| 703 context_locals->Add(var, zone()); | |
| 704 } else if (var->IsGlobalSlot()) { | |
| 705 context_globals->Add(var, zone()); | |
| 706 } | |
| 707 } | |
| 708 } | |
| 709 | |
| 710 | |
| 711 bool Scope::AllocateVariables(ParseInfo* info, AstNodeFactory* factory) { | |
| 712 // 1) Propagate scope information. | |
| 713 bool outer_scope_calls_sloppy_eval = false; | |
| 714 if (outer_scope_ != NULL) { | |
| 715 outer_scope_calls_sloppy_eval = | |
| 716 outer_scope_->outer_scope_calls_sloppy_eval() | | |
| 717 outer_scope_->calls_sloppy_eval(); | |
| 718 } | |
| 719 PropagateScopeInfo(outer_scope_calls_sloppy_eval); | |
| 720 | |
| 721 // 2) Allocate module instances. | |
| 722 if (FLAG_harmony_modules && is_script_scope()) { | |
| 723 DCHECK(num_modules_ == 0); | |
| 724 AllocateModules(); | |
| 725 } | |
| 726 | |
| 727 // 3) Resolve variables. | |
| 728 if (!ResolveVariablesRecursively(info, factory)) return false; | |
| 729 | |
| 730 // 4) Allocate variables. | |
| 731 AllocateVariablesRecursively(info->isolate()); | |
| 732 | |
| 733 return true; | |
| 734 } | |
| 735 | |
| 736 | |
| 737 bool Scope::HasTrivialContext() const { | |
| 738 // A function scope has a trivial context if it always is the global | |
| 739 // context. We iteratively scan out the context chain to see if | |
| 740 // there is anything that makes this scope non-trivial; otherwise we | |
| 741 // return true. | |
| 742 for (const Scope* scope = this; scope != NULL; scope = scope->outer_scope_) { | |
| 743 if (scope->is_eval_scope()) return false; | |
| 744 if (scope->scope_inside_with_) return false; | |
| 745 if (scope->ContextLocalCount() > 0) return false; | |
| 746 if (scope->ContextGlobalCount() > 0) return false; | |
| 747 } | |
| 748 return true; | |
| 749 } | |
| 750 | |
| 751 | |
| 752 bool Scope::HasTrivialOuterContext() const { | |
| 753 Scope* outer = outer_scope_; | |
| 754 if (outer == NULL) return true; | |
| 755 // Note that the outer context may be trivial in general, but the current | |
| 756 // scope may be inside a 'with' statement in which case the outer context | |
| 757 // for this scope is not trivial. | |
| 758 return !scope_inside_with_ && outer->HasTrivialContext(); | |
| 759 } | |
| 760 | |
| 761 | |
| 762 bool Scope::AllowsLazyParsing() const { | |
| 763 // If we are inside a block scope, we must parse eagerly to find out how | |
| 764 // to allocate variables on the block scope. At this point, declarations may | |
| 765 // not have yet been parsed. | |
| 766 for (const Scope* scope = this; scope != NULL; scope = scope->outer_scope_) { | |
| 767 if (scope->is_block_scope()) return false; | |
| 768 } | |
| 769 return AllowsLazyCompilation(); | |
| 770 } | |
| 771 | |
| 772 | |
| 773 bool Scope::AllowsLazyCompilation() const { return !force_eager_compilation_; } | |
| 774 | |
| 775 | |
| 776 bool Scope::AllowsLazyCompilationWithoutContext() const { | |
| 777 return !force_eager_compilation_ && HasTrivialOuterContext(); | |
| 778 } | |
| 779 | |
| 780 | |
| 781 int Scope::ContextChainLength(Scope* scope) { | |
| 782 int n = 0; | |
| 783 for (Scope* s = this; s != scope; s = s->outer_scope_) { | |
| 784 DCHECK(s != NULL); // scope must be in the scope chain | |
| 785 if (s->NeedsContext()) n++; | |
| 786 } | |
| 787 return n; | |
| 788 } | |
| 789 | |
| 790 | |
| 791 int Scope::MaxNestedContextChainLength() { | |
| 792 int max_context_chain_length = 0; | |
| 793 for (int i = 0; i < inner_scopes_.length(); i++) { | |
| 794 Scope* scope = inner_scopes_[i]; | |
| 795 max_context_chain_length = std::max(scope->MaxNestedContextChainLength(), | |
| 796 max_context_chain_length); | |
| 797 } | |
| 798 if (NeedsContext()) { | |
| 799 max_context_chain_length += 1; | |
| 800 } | |
| 801 return max_context_chain_length; | |
| 802 } | |
| 803 | |
| 804 | |
| 805 Scope* Scope::DeclarationScope() { | |
| 806 Scope* scope = this; | |
| 807 while (!scope->is_declaration_scope()) { | |
| 808 scope = scope->outer_scope(); | |
| 809 } | |
| 810 return scope; | |
| 811 } | |
| 812 | |
| 813 | |
| 814 Scope* Scope::ClosureScope() { | |
| 815 Scope* scope = this; | |
| 816 while (!scope->is_declaration_scope() || scope->is_block_scope()) { | |
| 817 scope = scope->outer_scope(); | |
| 818 } | |
| 819 return scope; | |
| 820 } | |
| 821 | |
| 822 | |
| 823 Scope* Scope::ReceiverScope() { | |
| 824 Scope* scope = this; | |
| 825 while (!scope->is_script_scope() && | |
| 826 (!scope->is_function_scope() || scope->is_arrow_scope())) { | |
| 827 scope = scope->outer_scope(); | |
| 828 } | |
| 829 return scope; | |
| 830 } | |
| 831 | |
| 832 | |
| 833 | |
| 834 Handle<ScopeInfo> Scope::GetScopeInfo(Isolate* isolate) { | |
| 835 if (scope_info_.is_null()) { | |
| 836 scope_info_ = ScopeInfo::Create(isolate, zone(), this); | |
| 837 } | |
| 838 return scope_info_; | |
| 839 } | |
| 840 | |
| 841 | |
| 842 void Scope::GetNestedScopeChain(Isolate* isolate, | |
| 843 List<Handle<ScopeInfo> >* chain, int position) { | |
| 844 if (!is_eval_scope()) chain->Add(Handle<ScopeInfo>(GetScopeInfo(isolate))); | |
| 845 | |
| 846 for (int i = 0; i < inner_scopes_.length(); i++) { | |
| 847 Scope* scope = inner_scopes_[i]; | |
| 848 int beg_pos = scope->start_position(); | |
| 849 int end_pos = scope->end_position(); | |
| 850 DCHECK(beg_pos >= 0 && end_pos >= 0); | |
| 851 if (beg_pos <= position && position < end_pos) { | |
| 852 scope->GetNestedScopeChain(isolate, chain, position); | |
| 853 return; | |
| 854 } | |
| 855 } | |
| 856 } | |
| 857 | |
| 858 | |
| 859 void Scope::ReportMessage(int start_position, int end_position, | |
| 860 MessageTemplate::Template message, | |
| 861 const AstRawString* arg) { | |
| 862 // Propagate the error to the topmost scope targeted by this scope analysis | |
| 863 // phase. | |
| 864 Scope* top = this; | |
| 865 while (!top->is_script_scope() && !top->outer_scope()->already_resolved()) { | |
| 866 top = top->outer_scope(); | |
| 867 } | |
| 868 | |
| 869 top->pending_error_handler_.ReportMessageAt(start_position, end_position, | |
| 870 message, arg, kReferenceError); | |
| 871 } | |
| 872 | |
| 873 | |
| 874 #ifdef DEBUG | |
| 875 static const char* Header(ScopeType scope_type, FunctionKind function_kind, | |
| 876 bool is_declaration_scope) { | |
| 877 switch (scope_type) { | |
| 878 case EVAL_SCOPE: return "eval"; | |
| 879 // TODO(adamk): Should we print concise method scopes specially? | |
| 880 case FUNCTION_SCOPE: | |
| 881 return IsArrowFunction(function_kind) ? "arrow" : "function"; | |
| 882 case MODULE_SCOPE: return "module"; | |
| 883 case SCRIPT_SCOPE: return "global"; | |
| 884 case CATCH_SCOPE: return "catch"; | |
| 885 case BLOCK_SCOPE: return is_declaration_scope ? "varblock" : "block"; | |
| 886 case WITH_SCOPE: return "with"; | |
| 887 } | |
| 888 UNREACHABLE(); | |
| 889 return NULL; | |
| 890 } | |
| 891 | |
| 892 | |
| 893 static void Indent(int n, const char* str) { | |
| 894 PrintF("%*s%s", n, "", str); | |
| 895 } | |
| 896 | |
| 897 | |
| 898 static void PrintName(const AstRawString* name) { | |
| 899 PrintF("%.*s", name->length(), name->raw_data()); | |
| 900 } | |
| 901 | |
| 902 | |
| 903 static void PrintLocation(Variable* var) { | |
| 904 switch (var->location()) { | |
| 905 case VariableLocation::UNALLOCATED: | |
| 906 break; | |
| 907 case VariableLocation::PARAMETER: | |
| 908 PrintF("parameter[%d]", var->index()); | |
| 909 break; | |
| 910 case VariableLocation::LOCAL: | |
| 911 PrintF("local[%d]", var->index()); | |
| 912 break; | |
| 913 case VariableLocation::CONTEXT: | |
| 914 PrintF("context[%d]", var->index()); | |
| 915 break; | |
| 916 case VariableLocation::GLOBAL: | |
| 917 PrintF("global[%d]", var->index()); | |
| 918 break; | |
| 919 case VariableLocation::LOOKUP: | |
| 920 PrintF("lookup"); | |
| 921 break; | |
| 922 } | |
| 923 } | |
| 924 | |
| 925 | |
| 926 static void PrintVar(int indent, Variable* var) { | |
| 927 if (var->is_used() || !var->IsUnallocated()) { | |
| 928 Indent(indent, Variable::Mode2String(var->mode())); | |
| 929 PrintF(" "); | |
| 930 if (var->raw_name()->IsEmpty()) | |
| 931 PrintF(".%p", reinterpret_cast<void*>(var)); | |
| 932 else | |
| 933 PrintName(var->raw_name()); | |
| 934 PrintF("; // "); | |
| 935 PrintLocation(var); | |
| 936 bool comma = !var->IsUnallocated(); | |
| 937 if (var->has_forced_context_allocation()) { | |
| 938 if (comma) PrintF(", "); | |
| 939 PrintF("forced context allocation"); | |
| 940 comma = true; | |
| 941 } | |
| 942 if (var->maybe_assigned() == kMaybeAssigned) { | |
| 943 if (comma) PrintF(", "); | |
| 944 PrintF("maybe assigned"); | |
| 945 } | |
| 946 PrintF("\n"); | |
| 947 } | |
| 948 } | |
| 949 | |
| 950 | |
| 951 static void PrintMap(int indent, VariableMap* map) { | |
| 952 for (VariableMap::Entry* p = map->Start(); p != NULL; p = map->Next(p)) { | |
| 953 Variable* var = reinterpret_cast<Variable*>(p->value); | |
| 954 if (var == NULL) { | |
| 955 Indent(indent, "<?>\n"); | |
| 956 } else { | |
| 957 PrintVar(indent, var); | |
| 958 } | |
| 959 } | |
| 960 } | |
| 961 | |
| 962 | |
| 963 void Scope::Print(int n) { | |
| 964 int n0 = (n > 0 ? n : 0); | |
| 965 int n1 = n0 + 2; // indentation | |
| 966 | |
| 967 // Print header. | |
| 968 Indent(n0, Header(scope_type_, function_kind_, is_declaration_scope())); | |
| 969 if (scope_name_ != nullptr && !scope_name_->IsEmpty()) { | |
| 970 PrintF(" "); | |
| 971 PrintName(scope_name_); | |
| 972 } | |
| 973 | |
| 974 // Print parameters, if any. | |
| 975 if (is_function_scope()) { | |
| 976 PrintF(" ("); | |
| 977 for (int i = 0; i < params_.length(); i++) { | |
| 978 if (i > 0) PrintF(", "); | |
| 979 const AstRawString* name = params_[i]->raw_name(); | |
| 980 if (name->IsEmpty()) | |
| 981 PrintF(".%p", reinterpret_cast<void*>(params_[i])); | |
| 982 else | |
| 983 PrintName(name); | |
| 984 } | |
| 985 PrintF(")"); | |
| 986 } | |
| 987 | |
| 988 PrintF(" { // (%d, %d)\n", start_position(), end_position()); | |
| 989 | |
| 990 // Function name, if any (named function literals, only). | |
| 991 if (function_ != NULL) { | |
| 992 Indent(n1, "// (local) function name: "); | |
| 993 PrintName(function_->proxy()->raw_name()); | |
| 994 PrintF("\n"); | |
| 995 } | |
| 996 | |
| 997 // Scope info. | |
| 998 if (HasTrivialOuterContext()) { | |
| 999 Indent(n1, "// scope has trivial outer context\n"); | |
| 1000 } | |
| 1001 if (is_strong(language_mode())) { | |
| 1002 Indent(n1, "// strong mode scope\n"); | |
| 1003 } else if (is_strict(language_mode())) { | |
| 1004 Indent(n1, "// strict mode scope\n"); | |
| 1005 } | |
| 1006 if (scope_inside_with_) Indent(n1, "// scope inside 'with'\n"); | |
| 1007 if (scope_contains_with_) Indent(n1, "// scope contains 'with'\n"); | |
| 1008 if (scope_calls_eval_) Indent(n1, "// scope calls 'eval'\n"); | |
| 1009 if (scope_uses_arguments_) Indent(n1, "// scope uses 'arguments'\n"); | |
| 1010 if (scope_uses_super_property_) | |
| 1011 Indent(n1, "// scope uses 'super' property\n"); | |
| 1012 if (outer_scope_calls_sloppy_eval_) { | |
| 1013 Indent(n1, "// outer scope calls 'eval' in sloppy context\n"); | |
| 1014 } | |
| 1015 if (inner_scope_calls_eval_) Indent(n1, "// inner scope calls 'eval'\n"); | |
| 1016 if (num_stack_slots_ > 0) { | |
| 1017 Indent(n1, "// "); | |
| 1018 PrintF("%d stack slots\n", num_stack_slots_); | |
| 1019 } | |
| 1020 if (num_heap_slots_ > 0) { | |
| 1021 Indent(n1, "// "); | |
| 1022 PrintF("%d heap slots (including %d global slots)\n", num_heap_slots_, | |
| 1023 num_global_slots_); | |
| 1024 } | |
| 1025 | |
| 1026 // Print locals. | |
| 1027 if (function_ != NULL) { | |
| 1028 Indent(n1, "// function var:\n"); | |
| 1029 PrintVar(n1, function_->proxy()->var()); | |
| 1030 } | |
| 1031 | |
| 1032 if (temps_.length() > 0) { | |
| 1033 Indent(n1, "// temporary vars:\n"); | |
| 1034 for (int i = 0; i < temps_.length(); i++) { | |
| 1035 PrintVar(n1, temps_[i]); | |
| 1036 } | |
| 1037 } | |
| 1038 | |
| 1039 if (variables_.Start() != NULL) { | |
| 1040 Indent(n1, "// local vars:\n"); | |
| 1041 PrintMap(n1, &variables_); | |
| 1042 } | |
| 1043 | |
| 1044 if (dynamics_ != NULL) { | |
| 1045 Indent(n1, "// dynamic vars:\n"); | |
| 1046 PrintMap(n1, dynamics_->GetMap(DYNAMIC)); | |
| 1047 PrintMap(n1, dynamics_->GetMap(DYNAMIC_LOCAL)); | |
| 1048 PrintMap(n1, dynamics_->GetMap(DYNAMIC_GLOBAL)); | |
| 1049 } | |
| 1050 | |
| 1051 // Print inner scopes (disable by providing negative n). | |
| 1052 if (n >= 0) { | |
| 1053 for (int i = 0; i < inner_scopes_.length(); i++) { | |
| 1054 PrintF("\n"); | |
| 1055 inner_scopes_[i]->Print(n1); | |
| 1056 } | |
| 1057 } | |
| 1058 | |
| 1059 Indent(n0, "}\n"); | |
| 1060 } | |
| 1061 #endif // DEBUG | |
| 1062 | |
| 1063 | |
| 1064 Variable* Scope::NonLocal(const AstRawString* name, VariableMode mode) { | |
| 1065 if (dynamics_ == NULL) dynamics_ = new (zone()) DynamicScopePart(zone()); | |
| 1066 VariableMap* map = dynamics_->GetMap(mode); | |
| 1067 Variable* var = map->Lookup(name); | |
| 1068 if (var == NULL) { | |
| 1069 // Declare a new non-local. | |
| 1070 InitializationFlag init_flag = (mode == VAR) | |
| 1071 ? kCreatedInitialized : kNeedsInitialization; | |
| 1072 var = map->Declare(NULL, | |
| 1073 name, | |
| 1074 mode, | |
| 1075 Variable::NORMAL, | |
| 1076 init_flag); | |
| 1077 // Allocate it by giving it a dynamic lookup. | |
| 1078 var->AllocateTo(VariableLocation::LOOKUP, -1); | |
| 1079 } | |
| 1080 return var; | |
| 1081 } | |
| 1082 | |
| 1083 | |
| 1084 Variable* Scope::LookupRecursive(VariableProxy* proxy, | |
| 1085 BindingKind* binding_kind, | |
| 1086 AstNodeFactory* factory) { | |
| 1087 DCHECK(binding_kind != NULL); | |
| 1088 if (already_resolved() && is_with_scope()) { | |
| 1089 // Short-cut: if the scope is deserialized from a scope info, variable | |
| 1090 // allocation is already fixed. We can simply return with dynamic lookup. | |
| 1091 *binding_kind = DYNAMIC_LOOKUP; | |
| 1092 return NULL; | |
| 1093 } | |
| 1094 | |
| 1095 // Try to find the variable in this scope. | |
| 1096 Variable* var = LookupLocal(proxy->raw_name()); | |
| 1097 | |
| 1098 // We found a variable and we are done. (Even if there is an 'eval' in | |
| 1099 // this scope which introduces the same variable again, the resulting | |
| 1100 // variable remains the same.) | |
| 1101 if (var != NULL) { | |
| 1102 *binding_kind = BOUND; | |
| 1103 return var; | |
| 1104 } | |
| 1105 | |
| 1106 // We did not find a variable locally. Check against the function variable, | |
| 1107 // if any. We can do this for all scopes, since the function variable is | |
| 1108 // only present - if at all - for function scopes. | |
| 1109 *binding_kind = UNBOUND; | |
| 1110 var = LookupFunctionVar(proxy->raw_name(), factory); | |
| 1111 if (var != NULL) { | |
| 1112 *binding_kind = BOUND; | |
| 1113 } else if (outer_scope_ != NULL) { | |
| 1114 var = outer_scope_->LookupRecursive(proxy, binding_kind, factory); | |
| 1115 if (*binding_kind == BOUND && (is_function_scope() || is_with_scope())) { | |
| 1116 var->ForceContextAllocation(); | |
| 1117 } | |
| 1118 } else { | |
| 1119 DCHECK(is_script_scope()); | |
| 1120 } | |
| 1121 | |
| 1122 // "this" can't be shadowed by "eval"-introduced bindings or by "with" scopes. | |
| 1123 // TODO(wingo): There are other variables in this category; add them. | |
| 1124 bool name_can_be_shadowed = var == nullptr || !var->is_this(); | |
| 1125 | |
| 1126 if (is_with_scope() && name_can_be_shadowed) { | |
| 1127 DCHECK(!already_resolved()); | |
| 1128 // The current scope is a with scope, so the variable binding can not be | |
| 1129 // statically resolved. However, note that it was necessary to do a lookup | |
| 1130 // in the outer scope anyway, because if a binding exists in an outer scope, | |
| 1131 // the associated variable has to be marked as potentially being accessed | |
| 1132 // from inside of an inner with scope (the property may not be in the 'with' | |
| 1133 // object). | |
| 1134 if (var != NULL && proxy->is_assigned()) var->set_maybe_assigned(); | |
| 1135 *binding_kind = DYNAMIC_LOOKUP; | |
| 1136 return NULL; | |
| 1137 } else if (calls_sloppy_eval() && !is_script_scope() && | |
| 1138 name_can_be_shadowed) { | |
| 1139 // A variable binding may have been found in an outer scope, but the current | |
| 1140 // scope makes a sloppy 'eval' call, so the found variable may not be | |
| 1141 // the correct one (the 'eval' may introduce a binding with the same name). | |
| 1142 // In that case, change the lookup result to reflect this situation. | |
| 1143 if (*binding_kind == BOUND) { | |
| 1144 *binding_kind = BOUND_EVAL_SHADOWED; | |
| 1145 } else if (*binding_kind == UNBOUND) { | |
| 1146 *binding_kind = UNBOUND_EVAL_SHADOWED; | |
| 1147 } | |
| 1148 } | |
| 1149 return var; | |
| 1150 } | |
| 1151 | |
| 1152 | |
| 1153 bool Scope::ResolveVariable(ParseInfo* info, VariableProxy* proxy, | |
| 1154 AstNodeFactory* factory) { | |
| 1155 DCHECK(info->script_scope()->is_script_scope()); | |
| 1156 | |
| 1157 // If the proxy is already resolved there's nothing to do | |
| 1158 // (functions and consts may be resolved by the parser). | |
| 1159 if (proxy->is_resolved()) return true; | |
| 1160 | |
| 1161 // Otherwise, try to resolve the variable. | |
| 1162 BindingKind binding_kind; | |
| 1163 Variable* var = LookupRecursive(proxy, &binding_kind, factory); | |
| 1164 switch (binding_kind) { | |
| 1165 case BOUND: | |
| 1166 // We found a variable binding. | |
| 1167 if (is_strong(language_mode())) { | |
| 1168 if (!CheckStrongModeDeclaration(proxy, var)) return false; | |
| 1169 } | |
| 1170 break; | |
| 1171 | |
| 1172 case BOUND_EVAL_SHADOWED: | |
| 1173 // We either found a variable binding that might be shadowed by eval or | |
| 1174 // gave up on it (e.g. by encountering a local with the same in the outer | |
| 1175 // scope which was not promoted to a context, this can happen if we use | |
| 1176 // debugger to evaluate arbitrary expressions at a break point). | |
| 1177 if (var->IsGlobalObjectProperty()) { | |
| 1178 var = NonLocal(proxy->raw_name(), DYNAMIC_GLOBAL); | |
| 1179 } else if (var->is_dynamic()) { | |
| 1180 var = NonLocal(proxy->raw_name(), DYNAMIC); | |
| 1181 } else { | |
| 1182 Variable* invalidated = var; | |
| 1183 var = NonLocal(proxy->raw_name(), DYNAMIC_LOCAL); | |
| 1184 var->set_local_if_not_shadowed(invalidated); | |
| 1185 } | |
| 1186 break; | |
| 1187 | |
| 1188 case UNBOUND: | |
| 1189 // No binding has been found. Declare a variable on the global object. | |
| 1190 var = info->script_scope()->DeclareDynamicGlobal(proxy->raw_name()); | |
| 1191 break; | |
| 1192 | |
| 1193 case UNBOUND_EVAL_SHADOWED: | |
| 1194 // No binding has been found. But some scope makes a sloppy 'eval' call. | |
| 1195 var = NonLocal(proxy->raw_name(), DYNAMIC_GLOBAL); | |
| 1196 break; | |
| 1197 | |
| 1198 case DYNAMIC_LOOKUP: | |
| 1199 // The variable could not be resolved statically. | |
| 1200 var = NonLocal(proxy->raw_name(), DYNAMIC); | |
| 1201 break; | |
| 1202 } | |
| 1203 | |
| 1204 DCHECK(var != NULL); | |
| 1205 if (proxy->is_assigned()) var->set_maybe_assigned(); | |
| 1206 | |
| 1207 if (is_strong(language_mode())) { | |
| 1208 // Record that the variable is referred to from strong mode. Also, record | |
| 1209 // the position. | |
| 1210 var->RecordStrongModeReference(proxy->position(), proxy->end_position()); | |
| 1211 } | |
| 1212 | |
| 1213 proxy->BindTo(var); | |
| 1214 | |
| 1215 return true; | |
| 1216 } | |
| 1217 | |
| 1218 | |
| 1219 bool Scope::CheckStrongModeDeclaration(VariableProxy* proxy, Variable* var) { | |
| 1220 // Check for declaration-after use (for variables) in strong mode. Note that | |
| 1221 // we can only do this in the case where we have seen the declaration. And we | |
| 1222 // always allow referencing functions (for now). | |
| 1223 | |
| 1224 // This might happen during lazy compilation; we don't keep track of | |
| 1225 // initializer positions for variables stored in ScopeInfo, so we cannot check | |
| 1226 // bindings against them. TODO(marja, rossberg): remove this hack. | |
| 1227 if (var->initializer_position() == RelocInfo::kNoPosition) return true; | |
| 1228 | |
| 1229 // Allow referencing the class name from methods of that class, even though | |
| 1230 // the initializer position for class names is only after the body. | |
| 1231 Scope* scope = this; | |
| 1232 while (scope) { | |
| 1233 if (scope->ClassVariableForMethod() == var) return true; | |
| 1234 scope = scope->outer_scope(); | |
| 1235 } | |
| 1236 | |
| 1237 // Allow references from methods to classes declared later, if we detect no | |
| 1238 // problematic dependency cycles. Note that we can be inside multiple methods | |
| 1239 // at the same time, and it's enough if we find one where the reference is | |
| 1240 // allowed. | |
| 1241 if (var->is_class() && | |
| 1242 var->AsClassVariable()->declaration_group_start() >= 0) { | |
| 1243 for (scope = this; scope && scope != var->scope(); | |
| 1244 scope = scope->outer_scope()) { | |
| 1245 ClassVariable* class_var = scope->ClassVariableForMethod(); | |
| 1246 // A method is referring to some other class, possibly declared | |
| 1247 // later. Referring to a class declared earlier is always OK and covered | |
| 1248 // by the code outside this if. Here we only need to allow special cases | |
| 1249 // for referring to a class which is declared later. | |
| 1250 | |
| 1251 // Referring to a class C declared later is OK under the following | |
| 1252 // circumstances: | |
| 1253 | |
| 1254 // 1. The class declarations are in a consecutive group with no other | |
| 1255 // declarations or statements in between, and | |
| 1256 | |
| 1257 // 2. There is no dependency cycle where the first edge is an | |
| 1258 // initialization time dependency (computed property name or extends | |
| 1259 // clause) from C to something that depends on this class directly or | |
| 1260 // transitively. | |
| 1261 if (class_var && | |
| 1262 class_var->declaration_group_start() == | |
| 1263 var->AsClassVariable()->declaration_group_start()) { | |
| 1264 return true; | |
| 1265 } | |
| 1266 | |
| 1267 // TODO(marja,rossberg): implement the dependency cycle detection. Here we | |
| 1268 // undershoot the target and allow referring to any class in the same | |
| 1269 // consectuive declaration group. | |
| 1270 | |
| 1271 // The cycle detection can work roughly like this: 1) detect init-time | |
| 1272 // references here (they are free variables which are inside the class | |
| 1273 // scope but not inside a method scope - no parser changes needed to | |
| 1274 // detect them) 2) if we encounter an init-time reference here, allow it, | |
| 1275 // but record it for a later dependency cycle check 3) also record | |
| 1276 // non-init-time references here 4) after scope analysis is done, analyse | |
| 1277 // the dependency cycles: an illegal cycle is one starting with an | |
| 1278 // init-time reference and leading back to the starting point with either | |
| 1279 // non-init-time and init-time references. | |
| 1280 } | |
| 1281 } | |
| 1282 | |
| 1283 // If both the use and the declaration are inside an eval scope (possibly | |
| 1284 // indirectly), or one of them is, we need to check whether they are inside | |
| 1285 // the same eval scope or different ones. | |
| 1286 | |
| 1287 // TODO(marja,rossberg): Detect errors across different evals (depends on the | |
| 1288 // future of eval in strong mode). | |
| 1289 const Scope* eval_for_use = NearestOuterEvalScope(); | |
| 1290 const Scope* eval_for_declaration = var->scope()->NearestOuterEvalScope(); | |
| 1291 | |
| 1292 if (proxy->position() != RelocInfo::kNoPosition && | |
| 1293 proxy->position() < var->initializer_position() && !var->is_function() && | |
| 1294 eval_for_use == eval_for_declaration) { | |
| 1295 DCHECK(proxy->end_position() != RelocInfo::kNoPosition); | |
| 1296 ReportMessage(proxy->position(), proxy->end_position(), | |
| 1297 MessageTemplate::kStrongUseBeforeDeclaration, | |
| 1298 proxy->raw_name()); | |
| 1299 return false; | |
| 1300 } | |
| 1301 return true; | |
| 1302 } | |
| 1303 | |
| 1304 | |
| 1305 ClassVariable* Scope::ClassVariableForMethod() const { | |
| 1306 // TODO(marja, rossberg): This fails to find a class variable in the following | |
| 1307 // cases: | |
| 1308 // let A = class { ... } | |
| 1309 // It needs to be investigated whether this causes any practical problems. | |
| 1310 if (!is_function_scope()) return nullptr; | |
| 1311 if (IsInObjectLiteral(function_kind_)) return nullptr; | |
| 1312 if (!IsConciseMethod(function_kind_) && !IsClassConstructor(function_kind_) && | |
| 1313 !IsAccessorFunction(function_kind_)) { | |
| 1314 return nullptr; | |
| 1315 } | |
| 1316 DCHECK_NOT_NULL(outer_scope_); | |
| 1317 // The class scope contains at most one variable, the class name. | |
| 1318 DCHECK(outer_scope_->variables_.occupancy() <= 1); | |
| 1319 if (outer_scope_->variables_.occupancy() == 0) return nullptr; | |
| 1320 VariableMap::Entry* p = outer_scope_->variables_.Start(); | |
| 1321 Variable* var = reinterpret_cast<Variable*>(p->value); | |
| 1322 if (!var->is_class()) return nullptr; | |
| 1323 return var->AsClassVariable(); | |
| 1324 } | |
| 1325 | |
| 1326 | |
| 1327 bool Scope::ResolveVariablesRecursively(ParseInfo* info, | |
| 1328 AstNodeFactory* factory) { | |
| 1329 DCHECK(info->script_scope()->is_script_scope()); | |
| 1330 | |
| 1331 // Resolve unresolved variables for this scope. | |
| 1332 for (int i = 0; i < unresolved_.length(); i++) { | |
| 1333 if (!ResolveVariable(info, unresolved_[i], factory)) return false; | |
| 1334 } | |
| 1335 | |
| 1336 // Resolve unresolved variables for inner scopes. | |
| 1337 for (int i = 0; i < inner_scopes_.length(); i++) { | |
| 1338 if (!inner_scopes_[i]->ResolveVariablesRecursively(info, factory)) | |
| 1339 return false; | |
| 1340 } | |
| 1341 | |
| 1342 return true; | |
| 1343 } | |
| 1344 | |
| 1345 | |
| 1346 void Scope::PropagateScopeInfo(bool outer_scope_calls_sloppy_eval ) { | |
| 1347 if (outer_scope_calls_sloppy_eval) { | |
| 1348 outer_scope_calls_sloppy_eval_ = true; | |
| 1349 } | |
| 1350 | |
| 1351 bool calls_sloppy_eval = | |
| 1352 this->calls_sloppy_eval() || outer_scope_calls_sloppy_eval_; | |
| 1353 for (int i = 0; i < inner_scopes_.length(); i++) { | |
| 1354 Scope* inner = inner_scopes_[i]; | |
| 1355 inner->PropagateScopeInfo(calls_sloppy_eval); | |
| 1356 if (inner->scope_calls_eval_ || inner->inner_scope_calls_eval_) { | |
| 1357 inner_scope_calls_eval_ = true; | |
| 1358 } | |
| 1359 if (inner->force_eager_compilation_) { | |
| 1360 force_eager_compilation_ = true; | |
| 1361 } | |
| 1362 if (asm_module_ && inner->scope_type() == FUNCTION_SCOPE) { | |
| 1363 inner->asm_function_ = true; | |
| 1364 } | |
| 1365 } | |
| 1366 } | |
| 1367 | |
| 1368 | |
| 1369 bool Scope::MustAllocate(Variable* var) { | |
| 1370 // Give var a read/write use if there is a chance it might be accessed | |
| 1371 // via an eval() call. This is only possible if the variable has a | |
| 1372 // visible name. | |
| 1373 if ((var->is_this() || !var->raw_name()->IsEmpty()) && | |
| 1374 (var->has_forced_context_allocation() || scope_calls_eval_ || | |
| 1375 inner_scope_calls_eval_ || scope_contains_with_ || is_catch_scope() || | |
| 1376 is_block_scope() || is_module_scope() || is_script_scope())) { | |
| 1377 var->set_is_used(); | |
| 1378 if (scope_calls_eval_ || inner_scope_calls_eval_) var->set_maybe_assigned(); | |
| 1379 } | |
| 1380 // Global variables do not need to be allocated. | |
| 1381 return !var->IsGlobalObjectProperty() && var->is_used(); | |
| 1382 } | |
| 1383 | |
| 1384 | |
| 1385 bool Scope::MustAllocateInContext(Variable* var) { | |
| 1386 // If var is accessed from an inner scope, or if there is a possibility | |
| 1387 // that it might be accessed from the current or an inner scope (through | |
| 1388 // an eval() call or a runtime with lookup), it must be allocated in the | |
| 1389 // context. | |
| 1390 // | |
| 1391 // Exceptions: If the scope as a whole has forced context allocation, all | |
| 1392 // variables will have context allocation, even temporaries. Otherwise | |
| 1393 // temporary variables are always stack-allocated. Catch-bound variables are | |
| 1394 // always context-allocated. | |
| 1395 if (has_forced_context_allocation()) return true; | |
| 1396 if (var->mode() == TEMPORARY) return false; | |
| 1397 if (is_catch_scope() || is_module_scope()) return true; | |
| 1398 if (is_script_scope() && IsLexicalVariableMode(var->mode())) return true; | |
| 1399 return var->has_forced_context_allocation() || | |
| 1400 scope_calls_eval_ || | |
| 1401 inner_scope_calls_eval_ || | |
| 1402 scope_contains_with_; | |
| 1403 } | |
| 1404 | |
| 1405 | |
| 1406 bool Scope::HasArgumentsParameter(Isolate* isolate) { | |
| 1407 for (int i = 0; i < params_.length(); i++) { | |
| 1408 if (params_[i]->name().is_identical_to( | |
| 1409 isolate->factory()->arguments_string())) { | |
| 1410 return true; | |
| 1411 } | |
| 1412 } | |
| 1413 return false; | |
| 1414 } | |
| 1415 | |
| 1416 | |
| 1417 void Scope::AllocateStackSlot(Variable* var) { | |
| 1418 if (is_block_scope()) { | |
| 1419 outer_scope()->DeclarationScope()->AllocateStackSlot(var); | |
| 1420 } else { | |
| 1421 var->AllocateTo(VariableLocation::LOCAL, num_stack_slots_++); | |
| 1422 } | |
| 1423 } | |
| 1424 | |
| 1425 | |
| 1426 void Scope::AllocateHeapSlot(Variable* var) { | |
| 1427 var->AllocateTo(VariableLocation::CONTEXT, num_heap_slots_++); | |
| 1428 } | |
| 1429 | |
| 1430 | |
| 1431 void Scope::AllocateParameterLocals(Isolate* isolate) { | |
| 1432 DCHECK(is_function_scope()); | |
| 1433 Variable* arguments = LookupLocal(ast_value_factory_->arguments_string()); | |
| 1434 // Functions have 'arguments' declared implicitly in all non arrow functions. | |
| 1435 DCHECK(arguments != nullptr || is_arrow_scope()); | |
| 1436 | |
| 1437 bool uses_sloppy_arguments = false; | |
| 1438 | |
| 1439 if (arguments != nullptr && MustAllocate(arguments) && | |
| 1440 !HasArgumentsParameter(isolate)) { | |
| 1441 // 'arguments' is used. Unless there is also a parameter called | |
| 1442 // 'arguments', we must be conservative and allocate all parameters to | |
| 1443 // the context assuming they will be captured by the arguments object. | |
| 1444 // If we have a parameter named 'arguments', a (new) value is always | |
| 1445 // assigned to it via the function invocation. Then 'arguments' denotes | |
| 1446 // that specific parameter value and cannot be used to access the | |
| 1447 // parameters, which is why we don't need to allocate an arguments | |
| 1448 // object in that case. | |
| 1449 | |
| 1450 // We are using 'arguments'. Tell the code generator that is needs to | |
| 1451 // allocate the arguments object by setting 'arguments_'. | |
| 1452 arguments_ = arguments; | |
| 1453 | |
| 1454 // In strict mode 'arguments' does not alias formal parameters. | |
| 1455 // Therefore in strict mode we allocate parameters as if 'arguments' | |
| 1456 // were not used. | |
| 1457 // If the parameter list is not simple, arguments isn't sloppy either. | |
| 1458 uses_sloppy_arguments = | |
| 1459 is_sloppy(language_mode()) && has_simple_parameters(); | |
| 1460 } | |
| 1461 | |
| 1462 if (rest_parameter_ && !MustAllocate(rest_parameter_)) { | |
| 1463 rest_parameter_ = NULL; | |
| 1464 } | |
| 1465 | |
| 1466 // The same parameter may occur multiple times in the parameters_ list. | |
| 1467 // If it does, and if it is not copied into the context object, it must | |
| 1468 // receive the highest parameter index for that parameter; thus iteration | |
| 1469 // order is relevant! | |
| 1470 for (int i = params_.length() - 1; i >= 0; --i) { | |
| 1471 Variable* var = params_[i]; | |
| 1472 if (var == rest_parameter_) continue; | |
| 1473 | |
| 1474 DCHECK(var->scope() == this); | |
| 1475 if (uses_sloppy_arguments || has_forced_context_allocation()) { | |
| 1476 // Force context allocation of the parameter. | |
| 1477 var->ForceContextAllocation(); | |
| 1478 } | |
| 1479 AllocateParameter(var, i); | |
| 1480 } | |
| 1481 } | |
| 1482 | |
| 1483 | |
| 1484 void Scope::AllocateParameter(Variable* var, int index) { | |
| 1485 if (MustAllocate(var)) { | |
| 1486 if (MustAllocateInContext(var)) { | |
| 1487 DCHECK(var->IsUnallocated() || var->IsContextSlot()); | |
| 1488 if (var->IsUnallocated()) { | |
| 1489 AllocateHeapSlot(var); | |
| 1490 } | |
| 1491 } else { | |
| 1492 DCHECK(var->IsUnallocated() || var->IsParameter()); | |
| 1493 if (var->IsUnallocated()) { | |
| 1494 var->AllocateTo(VariableLocation::PARAMETER, index); | |
| 1495 } | |
| 1496 } | |
| 1497 } else { | |
| 1498 DCHECK(!var->IsGlobalSlot()); | |
| 1499 } | |
| 1500 } | |
| 1501 | |
| 1502 | |
| 1503 void Scope::AllocateReceiver() { | |
| 1504 DCHECK_NOT_NULL(receiver()); | |
| 1505 DCHECK_EQ(receiver()->scope(), this); | |
| 1506 | |
| 1507 if (has_forced_context_allocation()) { | |
| 1508 // Force context allocation of the receiver. | |
| 1509 receiver()->ForceContextAllocation(); | |
| 1510 } | |
| 1511 AllocateParameter(receiver(), -1); | |
| 1512 } | |
| 1513 | |
| 1514 | |
| 1515 void Scope::AllocateNonParameterLocal(Isolate* isolate, Variable* var) { | |
| 1516 DCHECK(var->scope() == this); | |
| 1517 DCHECK(!var->IsVariable(isolate->factory()->dot_result_string()) || | |
| 1518 !var->IsStackLocal()); | |
| 1519 if (var->IsUnallocated() && MustAllocate(var)) { | |
| 1520 if (MustAllocateInContext(var)) { | |
| 1521 AllocateHeapSlot(var); | |
| 1522 } else { | |
| 1523 AllocateStackSlot(var); | |
| 1524 } | |
| 1525 } | |
| 1526 } | |
| 1527 | |
| 1528 | |
| 1529 void Scope::AllocateDeclaredGlobal(Isolate* isolate, Variable* var) { | |
| 1530 DCHECK(var->scope() == this); | |
| 1531 DCHECK(!var->IsVariable(isolate->factory()->dot_result_string()) || | |
| 1532 !var->IsStackLocal()); | |
| 1533 if (var->IsUnallocated()) { | |
| 1534 if (var->IsStaticGlobalObjectProperty()) { | |
| 1535 DCHECK_EQ(-1, var->index()); | |
| 1536 DCHECK(var->name()->IsString()); | |
| 1537 var->AllocateTo(VariableLocation::GLOBAL, num_heap_slots_++); | |
| 1538 num_global_slots_++; | |
| 1539 } else { | |
| 1540 // There must be only DYNAMIC_GLOBAL in the script scope. | |
| 1541 DCHECK(!is_script_scope() || DYNAMIC_GLOBAL == var->mode()); | |
| 1542 } | |
| 1543 } | |
| 1544 } | |
| 1545 | |
| 1546 | |
| 1547 void Scope::AllocateNonParameterLocalsAndDeclaredGlobals(Isolate* isolate) { | |
| 1548 // All variables that have no rewrite yet are non-parameter locals. | |
| 1549 for (int i = 0; i < temps_.length(); i++) { | |
| 1550 AllocateNonParameterLocal(isolate, temps_[i]); | |
| 1551 } | |
| 1552 | |
| 1553 ZoneList<VarAndOrder> vars(variables_.occupancy(), zone()); | |
| 1554 for (VariableMap::Entry* p = variables_.Start(); | |
| 1555 p != NULL; | |
| 1556 p = variables_.Next(p)) { | |
| 1557 Variable* var = reinterpret_cast<Variable*>(p->value); | |
| 1558 vars.Add(VarAndOrder(var, p->order), zone()); | |
| 1559 } | |
| 1560 vars.Sort(VarAndOrder::Compare); | |
| 1561 int var_count = vars.length(); | |
| 1562 for (int i = 0; i < var_count; i++) { | |
| 1563 AllocateNonParameterLocal(isolate, vars[i].var()); | |
| 1564 } | |
| 1565 | |
| 1566 if (FLAG_global_var_shortcuts) { | |
| 1567 for (int i = 0; i < var_count; i++) { | |
| 1568 AllocateDeclaredGlobal(isolate, vars[i].var()); | |
| 1569 } | |
| 1570 } | |
| 1571 | |
| 1572 // For now, function_ must be allocated at the very end. If it gets | |
| 1573 // allocated in the context, it must be the last slot in the context, | |
| 1574 // because of the current ScopeInfo implementation (see | |
| 1575 // ScopeInfo::ScopeInfo(FunctionScope* scope) constructor). | |
| 1576 if (function_ != nullptr) { | |
| 1577 AllocateNonParameterLocal(isolate, function_->proxy()->var()); | |
| 1578 } | |
| 1579 | |
| 1580 if (rest_parameter_ != nullptr) { | |
| 1581 AllocateNonParameterLocal(isolate, rest_parameter_); | |
| 1582 } | |
| 1583 | |
| 1584 Variable* new_target_var = | |
| 1585 LookupLocal(ast_value_factory_->new_target_string()); | |
| 1586 if (new_target_var != nullptr && MustAllocate(new_target_var)) { | |
| 1587 new_target_ = new_target_var; | |
| 1588 } | |
| 1589 | |
| 1590 Variable* this_function_var = | |
| 1591 LookupLocal(ast_value_factory_->this_function_string()); | |
| 1592 if (this_function_var != nullptr && MustAllocate(this_function_var)) { | |
| 1593 this_function_ = this_function_var; | |
| 1594 } | |
| 1595 } | |
| 1596 | |
| 1597 | |
| 1598 void Scope::AllocateVariablesRecursively(Isolate* isolate) { | |
| 1599 if (!already_resolved()) { | |
| 1600 num_stack_slots_ = 0; | |
| 1601 } | |
| 1602 // Allocate variables for inner scopes. | |
| 1603 for (int i = 0; i < inner_scopes_.length(); i++) { | |
| 1604 inner_scopes_[i]->AllocateVariablesRecursively(isolate); | |
| 1605 } | |
| 1606 | |
| 1607 // If scope is already resolved, we still need to allocate | |
| 1608 // variables in inner scopes which might not had been resolved yet. | |
| 1609 if (already_resolved()) return; | |
| 1610 // The number of slots required for variables. | |
| 1611 num_heap_slots_ = Context::MIN_CONTEXT_SLOTS; | |
| 1612 | |
| 1613 // Allocate variables for this scope. | |
| 1614 // Parameters must be allocated first, if any. | |
| 1615 if (is_function_scope()) AllocateParameterLocals(isolate); | |
| 1616 if (has_this_declaration()) AllocateReceiver(); | |
| 1617 AllocateNonParameterLocalsAndDeclaredGlobals(isolate); | |
| 1618 | |
| 1619 // Force allocation of a context for this scope if necessary. For a 'with' | |
| 1620 // scope and for a function scope that makes an 'eval' call we need a context, | |
| 1621 // even if no local variables were statically allocated in the scope. | |
| 1622 // Likewise for modules. | |
| 1623 bool must_have_context = | |
| 1624 is_with_scope() || is_module_scope() || | |
| 1625 (is_function_scope() && calls_sloppy_eval()) || | |
| 1626 (is_block_scope() && is_declaration_scope() && calls_sloppy_eval()); | |
| 1627 | |
| 1628 // If we didn't allocate any locals in the local context, then we only | |
| 1629 // need the minimal number of slots if we must have a context. | |
| 1630 if (num_heap_slots_ == Context::MIN_CONTEXT_SLOTS && !must_have_context) { | |
| 1631 num_heap_slots_ = 0; | |
| 1632 } | |
| 1633 | |
| 1634 // Allocation done. | |
| 1635 DCHECK(num_heap_slots_ == 0 || num_heap_slots_ >= Context::MIN_CONTEXT_SLOTS); | |
| 1636 } | |
| 1637 | |
| 1638 | |
| 1639 void Scope::AllocateModules() { | |
| 1640 DCHECK(is_script_scope()); | |
| 1641 DCHECK(!already_resolved()); | |
| 1642 for (int i = 0; i < inner_scopes_.length(); i++) { | |
| 1643 Scope* scope = inner_scopes_.at(i); | |
| 1644 if (scope->is_module_scope()) { | |
| 1645 DCHECK(!scope->already_resolved()); | |
| 1646 DCHECK(scope->module_descriptor_->IsFrozen()); | |
| 1647 DCHECK_NULL(scope->module_var_); | |
| 1648 scope->module_var_ = | |
| 1649 NewTemporary(ast_value_factory_->dot_module_string()); | |
| 1650 ++num_modules_; | |
| 1651 } | |
| 1652 } | |
| 1653 } | |
| 1654 | |
| 1655 | |
| 1656 int Scope::StackLocalCount() const { | |
| 1657 return num_stack_slots() - | |
| 1658 (function_ != NULL && function_->proxy()->var()->IsStackLocal() ? 1 : 0); | |
| 1659 } | |
| 1660 | |
| 1661 | |
| 1662 int Scope::ContextLocalCount() const { | |
| 1663 if (num_heap_slots() == 0) return 0; | |
| 1664 bool is_function_var_in_context = | |
| 1665 function_ != NULL && function_->proxy()->var()->IsContextSlot(); | |
| 1666 return num_heap_slots() - Context::MIN_CONTEXT_SLOTS - num_global_slots() - | |
| 1667 (is_function_var_in_context ? 1 : 0); | |
| 1668 } | |
| 1669 | |
| 1670 | |
| 1671 int Scope::ContextGlobalCount() const { return num_global_slots(); } | |
| 1672 | |
| 1673 } // namespace internal | |
| 1674 } // namespace v8 | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 1481613002:
Create ast/ and parsing/ subdirectories and move appropriate files (Closed)
Base URL: https://chromium.googlesource.com/v8/v8.git@master