| // Copyright 2012 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "src/ast.h" |
| |
| #include <cmath> // For isfinite. |
| #include "src/builtins.h" |
| #include "src/code-stubs.h" |
| #include "src/contexts.h" |
| #include "src/conversions.h" |
| #include "src/hashmap.h" |
| #include "src/parser.h" |
| #include "src/property.h" |
| #include "src/property-details.h" |
| #include "src/scopes.h" |
| #include "src/string-stream.h" |
| #include "src/type-info.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| // ---------------------------------------------------------------------------- |
| // All the Accept member functions for each syntax tree node type. |
| |
| #define DECL_ACCEPT(type) \ |
| void type::Accept(AstVisitor* v) { v->Visit##type(this); } |
| AST_NODE_LIST(DECL_ACCEPT) |
| #undef DECL_ACCEPT |
| |
| |
| // ---------------------------------------------------------------------------- |
| // Implementation of other node functionality. |
| |
| |
| bool Expression::IsSmiLiteral() const { |
| return IsLiteral() && AsLiteral()->value()->IsSmi(); |
| } |
| |
| |
| bool Expression::IsStringLiteral() const { |
| return IsLiteral() && AsLiteral()->value()->IsString(); |
| } |
| |
| |
| bool Expression::IsNullLiteral() const { |
| return IsLiteral() && AsLiteral()->value()->IsNull(); |
| } |
| |
| |
| bool Expression::IsUndefinedLiteral(Isolate* isolate) const { |
| const VariableProxy* var_proxy = AsVariableProxy(); |
| if (var_proxy == NULL) return false; |
| Variable* var = var_proxy->var(); |
| // The global identifier "undefined" is immutable. Everything |
| // else could be reassigned. |
| return var != NULL && var->IsUnallocatedOrGlobalSlot() && |
| var_proxy->raw_name()->IsOneByteEqualTo("undefined"); |
| } |
| |
| |
| bool Expression::IsValidReferenceExpressionOrThis() const { |
| return IsValidReferenceExpression() || |
| (IsVariableProxy() && AsVariableProxy()->is_this()); |
| } |
| |
| |
| VariableProxy::VariableProxy(Zone* zone, Variable* var, int start_position, |
| int end_position) |
| : Expression(zone, start_position), |
| bit_field_(IsThisField::encode(var->is_this()) | |
| IsAssignedField::encode(false) | |
| IsResolvedField::encode(false)), |
| raw_name_(var->raw_name()), |
| end_position_(end_position) { |
| BindTo(var); |
| } |
| |
| |
| VariableProxy::VariableProxy(Zone* zone, const AstRawString* name, |
| Variable::Kind variable_kind, int start_position, |
| int end_position) |
| : Expression(zone, start_position), |
| bit_field_(IsThisField::encode(variable_kind == Variable::THIS) | |
| IsAssignedField::encode(false) | |
| IsResolvedField::encode(false)), |
| raw_name_(name), |
| end_position_(end_position) {} |
| |
| |
| void VariableProxy::BindTo(Variable* var) { |
| DCHECK((is_this() && var->is_this()) || raw_name() == var->raw_name()); |
| set_var(var); |
| set_is_resolved(); |
| var->set_is_used(); |
| } |
| |
| |
| void VariableProxy::AssignFeedbackVectorSlots(Isolate* isolate, |
| FeedbackVectorSpec* spec, |
| FeedbackVectorSlotCache* cache) { |
| if (UsesVariableFeedbackSlot()) { |
| // VariableProxies that point to the same Variable within a function can |
| // make their loads from the same IC slot. |
| if (var()->IsUnallocated()) { |
| ZoneHashMap::Entry* entry = cache->Get(var()); |
| if (entry != NULL) { |
| variable_feedback_slot_ = FeedbackVectorSlot( |
| static_cast<int>(reinterpret_cast<intptr_t>(entry->value))); |
| return; |
| } |
| } |
| variable_feedback_slot_ = spec->AddLoadICSlot(); |
| if (var()->IsUnallocated()) { |
| cache->Put(var(), variable_feedback_slot_); |
| } |
| } |
| } |
| |
| |
| static void AssignVectorSlots(Expression* expr, FeedbackVectorSpec* spec, |
| FeedbackVectorSlot* out_slot) { |
| if (FLAG_vector_stores) { |
| Property* property = expr->AsProperty(); |
| LhsKind assign_type = Property::GetAssignType(property); |
| if ((assign_type == VARIABLE && |
| expr->AsVariableProxy()->var()->IsUnallocated()) || |
| assign_type == NAMED_PROPERTY || assign_type == KEYED_PROPERTY) { |
| // TODO(ishell): consider using ICSlotCache for variables here. |
| FeedbackVectorSlotKind kind = assign_type == KEYED_PROPERTY |
| ? FeedbackVectorSlotKind::KEYED_STORE_IC |
| : FeedbackVectorSlotKind::STORE_IC; |
| *out_slot = spec->AddSlot(kind); |
| } |
| } |
| } |
| |
| |
| void ForEachStatement::AssignFeedbackVectorSlots( |
| Isolate* isolate, FeedbackVectorSpec* spec, |
| FeedbackVectorSlotCache* cache) { |
| AssignVectorSlots(each(), spec, &each_slot_); |
| } |
| |
| |
| Assignment::Assignment(Zone* zone, Token::Value op, Expression* target, |
| Expression* value, int pos) |
| : Expression(zone, pos), |
| bit_field_( |
| IsUninitializedField::encode(false) | KeyTypeField::encode(ELEMENT) | |
| StoreModeField::encode(STANDARD_STORE) | TokenField::encode(op)), |
| target_(target), |
| value_(value), |
| binary_operation_(NULL) {} |
| |
| |
| void Assignment::AssignFeedbackVectorSlots(Isolate* isolate, |
| FeedbackVectorSpec* spec, |
| FeedbackVectorSlotCache* cache) { |
| AssignVectorSlots(target(), spec, &slot_); |
| } |
| |
| |
| void CountOperation::AssignFeedbackVectorSlots(Isolate* isolate, |
| FeedbackVectorSpec* spec, |
| FeedbackVectorSlotCache* cache) { |
| AssignVectorSlots(expression(), spec, &slot_); |
| } |
| |
| |
| Token::Value Assignment::binary_op() const { |
| switch (op()) { |
| case Token::ASSIGN_BIT_OR: return Token::BIT_OR; |
| case Token::ASSIGN_BIT_XOR: return Token::BIT_XOR; |
| case Token::ASSIGN_BIT_AND: return Token::BIT_AND; |
| case Token::ASSIGN_SHL: return Token::SHL; |
| case Token::ASSIGN_SAR: return Token::SAR; |
| case Token::ASSIGN_SHR: return Token::SHR; |
| case Token::ASSIGN_ADD: return Token::ADD; |
| case Token::ASSIGN_SUB: return Token::SUB; |
| case Token::ASSIGN_MUL: return Token::MUL; |
| case Token::ASSIGN_DIV: return Token::DIV; |
| case Token::ASSIGN_MOD: return Token::MOD; |
| default: UNREACHABLE(); |
| } |
| return Token::ILLEGAL; |
| } |
| |
| |
| bool FunctionLiteral::AllowsLazyCompilation() { |
| return scope()->AllowsLazyCompilation(); |
| } |
| |
| |
| bool FunctionLiteral::AllowsLazyCompilationWithoutContext() { |
| return scope()->AllowsLazyCompilationWithoutContext(); |
| } |
| |
| |
| int FunctionLiteral::start_position() const { |
| return scope()->start_position(); |
| } |
| |
| |
| int FunctionLiteral::end_position() const { |
| return scope()->end_position(); |
| } |
| |
| |
| LanguageMode FunctionLiteral::language_mode() const { |
| return scope()->language_mode(); |
| } |
| |
| |
| bool FunctionLiteral::NeedsHomeObject(Expression* expr) { |
| if (expr == nullptr || !expr->IsFunctionLiteral()) return false; |
| DCHECK_NOT_NULL(expr->AsFunctionLiteral()->scope()); |
| return expr->AsFunctionLiteral()->scope()->NeedsHomeObject(); |
| } |
| |
| |
| ObjectLiteralProperty::ObjectLiteralProperty(Expression* key, Expression* value, |
| Kind kind, bool is_static, |
| bool is_computed_name) |
| : key_(key), |
| value_(value), |
| kind_(kind), |
| emit_store_(true), |
| is_static_(is_static), |
| is_computed_name_(is_computed_name) {} |
| |
| |
| ObjectLiteralProperty::ObjectLiteralProperty(AstValueFactory* ast_value_factory, |
| Expression* key, Expression* value, |
| bool is_static, |
| bool is_computed_name) |
| : key_(key), |
| value_(value), |
| emit_store_(true), |
| is_static_(is_static), |
| is_computed_name_(is_computed_name) { |
| if (!is_computed_name && |
| key->AsLiteral()->raw_value()->EqualsString( |
| ast_value_factory->proto_string())) { |
| kind_ = PROTOTYPE; |
| } else if (value_->AsMaterializedLiteral() != NULL) { |
| kind_ = MATERIALIZED_LITERAL; |
| } else if (value_->IsLiteral()) { |
| kind_ = CONSTANT; |
| } else { |
| kind_ = COMPUTED; |
| } |
| } |
| |
| |
| void ClassLiteral::AssignFeedbackVectorSlots(Isolate* isolate, |
| FeedbackVectorSpec* spec, |
| FeedbackVectorSlotCache* cache) { |
| if (!FLAG_vector_stores) return; |
| |
| // This logic that computes the number of slots needed for vector store |
| // ICs must mirror FullCodeGenerator::VisitClassLiteral. |
| if (NeedsProxySlot()) { |
| slot_ = spec->AddStoreICSlot(); |
| } |
| |
| for (int i = 0; i < properties()->length(); i++) { |
| ObjectLiteral::Property* property = properties()->at(i); |
| Expression* value = property->value(); |
| if (FunctionLiteral::NeedsHomeObject(value)) { |
| property->SetSlot(spec->AddStoreICSlot()); |
| } |
| } |
| } |
| |
| |
| bool ObjectLiteral::Property::IsCompileTimeValue() { |
| return kind_ == CONSTANT || |
| (kind_ == MATERIALIZED_LITERAL && |
| CompileTimeValue::IsCompileTimeValue(value_)); |
| } |
| |
| |
| void ObjectLiteral::Property::set_emit_store(bool emit_store) { |
| emit_store_ = emit_store; |
| } |
| |
| |
| bool ObjectLiteral::Property::emit_store() { |
| return emit_store_; |
| } |
| |
| |
| void ObjectLiteral::AssignFeedbackVectorSlots(Isolate* isolate, |
| FeedbackVectorSpec* spec, |
| FeedbackVectorSlotCache* cache) { |
| if (!FLAG_vector_stores) return; |
| |
| // This logic that computes the number of slots needed for vector store |
| // ics must mirror FullCodeGenerator::VisitObjectLiteral. |
| int property_index = 0; |
| for (; property_index < properties()->length(); property_index++) { |
| ObjectLiteral::Property* property = properties()->at(property_index); |
| if (property->is_computed_name()) break; |
| if (property->IsCompileTimeValue()) continue; |
| |
| Literal* key = property->key()->AsLiteral(); |
| Expression* value = property->value(); |
| switch (property->kind()) { |
| case ObjectLiteral::Property::CONSTANT: |
| UNREACHABLE(); |
| case ObjectLiteral::Property::MATERIALIZED_LITERAL: |
| // Fall through. |
| case ObjectLiteral::Property::COMPUTED: |
| // It is safe to use [[Put]] here because the boilerplate already |
| // contains computed properties with an uninitialized value. |
| if (key->value()->IsInternalizedString()) { |
| if (property->emit_store()) { |
| property->SetSlot(spec->AddStoreICSlot()); |
| if (FunctionLiteral::NeedsHomeObject(value)) { |
| property->SetSlot(spec->AddStoreICSlot(), 1); |
| } |
| } |
| break; |
| } |
| if (property->emit_store() && FunctionLiteral::NeedsHomeObject(value)) { |
| property->SetSlot(spec->AddStoreICSlot()); |
| } |
| break; |
| case ObjectLiteral::Property::PROTOTYPE: |
| break; |
| case ObjectLiteral::Property::GETTER: |
| if (property->emit_store() && FunctionLiteral::NeedsHomeObject(value)) { |
| property->SetSlot(spec->AddStoreICSlot()); |
| } |
| break; |
| case ObjectLiteral::Property::SETTER: |
| if (property->emit_store() && FunctionLiteral::NeedsHomeObject(value)) { |
| property->SetSlot(spec->AddStoreICSlot()); |
| } |
| break; |
| } |
| } |
| |
| for (; property_index < properties()->length(); property_index++) { |
| ObjectLiteral::Property* property = properties()->at(property_index); |
| |
| Expression* value = property->value(); |
| if (property->kind() != ObjectLiteral::Property::PROTOTYPE) { |
| if (FunctionLiteral::NeedsHomeObject(value)) { |
| property->SetSlot(spec->AddStoreICSlot()); |
| } |
| } |
| } |
| } |
| |
| |
| void ObjectLiteral::CalculateEmitStore(Zone* zone) { |
| const auto GETTER = ObjectLiteral::Property::GETTER; |
| const auto SETTER = ObjectLiteral::Property::SETTER; |
| |
| ZoneAllocationPolicy allocator(zone); |
| |
| ZoneHashMap table(Literal::Match, ZoneHashMap::kDefaultHashMapCapacity, |
| allocator); |
| for (int i = properties()->length() - 1; i >= 0; i--) { |
| ObjectLiteral::Property* property = properties()->at(i); |
| if (property->is_computed_name()) continue; |
| if (property->kind() == ObjectLiteral::Property::PROTOTYPE) continue; |
| Literal* literal = property->key()->AsLiteral(); |
| DCHECK(!literal->value()->IsNull()); |
| |
| // If there is an existing entry do not emit a store unless the previous |
| // entry was also an accessor. |
| uint32_t hash = literal->Hash(); |
| ZoneHashMap::Entry* entry = table.LookupOrInsert(literal, hash, allocator); |
| if (entry->value != NULL) { |
| auto previous_kind = |
| static_cast<ObjectLiteral::Property*>(entry->value)->kind(); |
| if (!((property->kind() == GETTER && previous_kind == SETTER) || |
| (property->kind() == SETTER && previous_kind == GETTER))) { |
| property->set_emit_store(false); |
| } |
| } |
| entry->value = property; |
| } |
| } |
| |
| |
| bool ObjectLiteral::IsBoilerplateProperty(ObjectLiteral::Property* property) { |
| return property != NULL && |
| property->kind() != ObjectLiteral::Property::PROTOTYPE; |
| } |
| |
| |
| void ObjectLiteral::BuildConstantProperties(Isolate* isolate) { |
| if (!constant_properties_.is_null()) return; |
| |
| // Allocate a fixed array to hold all the constant properties. |
| Handle<FixedArray> constant_properties = isolate->factory()->NewFixedArray( |
| boilerplate_properties_ * 2, TENURED); |
| |
| int position = 0; |
| // Accumulate the value in local variables and store it at the end. |
| bool is_simple = true; |
| int depth_acc = 1; |
| uint32_t max_element_index = 0; |
| uint32_t elements = 0; |
| for (int i = 0; i < properties()->length(); i++) { |
| ObjectLiteral::Property* property = properties()->at(i); |
| if (!IsBoilerplateProperty(property)) { |
| is_simple = false; |
| continue; |
| } |
| |
| if (position == boilerplate_properties_ * 2) { |
| DCHECK(property->is_computed_name()); |
| is_simple = false; |
| break; |
| } |
| DCHECK(!property->is_computed_name()); |
| |
| MaterializedLiteral* m_literal = property->value()->AsMaterializedLiteral(); |
| if (m_literal != NULL) { |
| m_literal->BuildConstants(isolate); |
| if (m_literal->depth() >= depth_acc) depth_acc = m_literal->depth() + 1; |
| } |
| |
| // Add CONSTANT and COMPUTED properties to boilerplate. Use undefined |
| // value for COMPUTED properties, the real value is filled in at |
| // runtime. The enumeration order is maintained. |
| Handle<Object> key = property->key()->AsLiteral()->value(); |
| Handle<Object> value = GetBoilerplateValue(property->value(), isolate); |
| |
| // Ensure objects that may, at any point in time, contain fields with double |
| // representation are always treated as nested objects. This is true for |
| // computed fields (value is undefined), and smi and double literals |
| // (value->IsNumber()). |
| // TODO(verwaest): Remove once we can store them inline. |
| if (FLAG_track_double_fields && |
| (value->IsNumber() || value->IsUninitialized())) { |
| may_store_doubles_ = true; |
| } |
| |
| is_simple = is_simple && !value->IsUninitialized(); |
| |
| // Keep track of the number of elements in the object literal and |
| // the largest element index. If the largest element index is |
| // much larger than the number of elements, creating an object |
| // literal with fast elements will be a waste of space. |
| uint32_t element_index = 0; |
| if (key->IsString() |
| && Handle<String>::cast(key)->AsArrayIndex(&element_index) |
| && element_index > max_element_index) { |
| max_element_index = element_index; |
| elements++; |
| } else if (key->IsSmi()) { |
| int key_value = Smi::cast(*key)->value(); |
| if (key_value > 0 |
| && static_cast<uint32_t>(key_value) > max_element_index) { |
| max_element_index = key_value; |
| } |
| elements++; |
| } |
| |
| // Add name, value pair to the fixed array. |
| constant_properties->set(position++, *key); |
| constant_properties->set(position++, *value); |
| } |
| |
| constant_properties_ = constant_properties; |
| fast_elements_ = |
| (max_element_index <= 32) || ((2 * elements) >= max_element_index); |
| has_elements_ = elements > 0; |
| set_is_simple(is_simple); |
| set_depth(depth_acc); |
| } |
| |
| |
| void ArrayLiteral::BuildConstantElements(Isolate* isolate) { |
| if (!constant_elements_.is_null()) return; |
| |
| int constants_length = |
| first_spread_index_ >= 0 ? first_spread_index_ : values()->length(); |
| |
| // Allocate a fixed array to hold all the object literals. |
| Handle<JSArray> array = isolate->factory()->NewJSArray( |
| FAST_HOLEY_SMI_ELEMENTS, constants_length, constants_length, |
| Strength::WEAK, INITIALIZE_ARRAY_ELEMENTS_WITH_HOLE); |
| |
| // Fill in the literals. |
| bool is_simple = (first_spread_index_ < 0); |
| int depth_acc = 1; |
| bool is_holey = false; |
| int array_index = 0; |
| for (; array_index < constants_length; array_index++) { |
| Expression* element = values()->at(array_index); |
| DCHECK(!element->IsSpread()); |
| MaterializedLiteral* m_literal = element->AsMaterializedLiteral(); |
| if (m_literal != NULL) { |
| m_literal->BuildConstants(isolate); |
| if (m_literal->depth() + 1 > depth_acc) { |
| depth_acc = m_literal->depth() + 1; |
| } |
| } |
| |
| // New handle scope here, needs to be after BuildContants(). |
| HandleScope scope(isolate); |
| Handle<Object> boilerplate_value = GetBoilerplateValue(element, isolate); |
| if (boilerplate_value->IsTheHole()) { |
| is_holey = true; |
| continue; |
| } |
| |
| if (boilerplate_value->IsUninitialized()) { |
| boilerplate_value = handle(Smi::FromInt(0), isolate); |
| is_simple = false; |
| } |
| |
| JSObject::AddDataElement(array, array_index, boilerplate_value, NONE) |
| .Assert(); |
| } |
| |
| JSObject::ValidateElements(array); |
| Handle<FixedArrayBase> element_values(array->elements()); |
| |
| // Simple and shallow arrays can be lazily copied, we transform the |
| // elements array to a copy-on-write array. |
| if (is_simple && depth_acc == 1 && array_index > 0 && |
| array->HasFastSmiOrObjectElements()) { |
| element_values->set_map(isolate->heap()->fixed_cow_array_map()); |
| } |
| |
| // Remember both the literal's constant values as well as the ElementsKind |
| // in a 2-element FixedArray. |
| Handle<FixedArray> literals = isolate->factory()->NewFixedArray(2, TENURED); |
| |
| ElementsKind kind = array->GetElementsKind(); |
| kind = is_holey ? GetHoleyElementsKind(kind) : GetPackedElementsKind(kind); |
| |
| literals->set(0, Smi::FromInt(kind)); |
| literals->set(1, *element_values); |
| |
| constant_elements_ = literals; |
| set_is_simple(is_simple); |
| set_depth(depth_acc); |
| } |
| |
| |
| void ArrayLiteral::AssignFeedbackVectorSlots(Isolate* isolate, |
| FeedbackVectorSpec* spec, |
| FeedbackVectorSlotCache* cache) { |
| if (!FLAG_vector_stores) return; |
| |
| // This logic that computes the number of slots needed for vector store |
| // ics must mirror FullCodeGenerator::VisitArrayLiteral. |
| int array_index = 0; |
| for (; array_index < values()->length(); array_index++) { |
| Expression* subexpr = values()->at(array_index); |
| if (subexpr->IsSpread()) break; |
| if (CompileTimeValue::IsCompileTimeValue(subexpr)) continue; |
| |
| // We'll reuse the same literal slot for all of the non-constant |
| // subexpressions that use a keyed store IC. |
| literal_slot_ = spec->AddKeyedStoreICSlot(); |
| return; |
| } |
| } |
| |
| |
| Handle<Object> MaterializedLiteral::GetBoilerplateValue(Expression* expression, |
| Isolate* isolate) { |
| if (expression->IsLiteral()) { |
| return expression->AsLiteral()->value(); |
| } |
| if (CompileTimeValue::IsCompileTimeValue(expression)) { |
| return CompileTimeValue::GetValue(isolate, expression); |
| } |
| return isolate->factory()->uninitialized_value(); |
| } |
| |
| |
| void MaterializedLiteral::BuildConstants(Isolate* isolate) { |
| if (IsArrayLiteral()) { |
| return AsArrayLiteral()->BuildConstantElements(isolate); |
| } |
| if (IsObjectLiteral()) { |
| return AsObjectLiteral()->BuildConstantProperties(isolate); |
| } |
| DCHECK(IsRegExpLiteral()); |
| DCHECK(depth() >= 1); // Depth should be initialized. |
| } |
| |
| |
| void UnaryOperation::RecordToBooleanTypeFeedback(TypeFeedbackOracle* oracle) { |
| // TODO(olivf) If this Operation is used in a test context, then the |
| // expression has a ToBoolean stub and we want to collect the type |
| // information. However the GraphBuilder expects it to be on the instruction |
| // corresponding to the TestContext, therefore we have to store it here and |
| // not on the operand. |
| set_to_boolean_types(oracle->ToBooleanTypes(expression()->test_id())); |
| } |
| |
| |
| void BinaryOperation::RecordToBooleanTypeFeedback(TypeFeedbackOracle* oracle) { |
| // TODO(olivf) If this Operation is used in a test context, then the right |
| // hand side has a ToBoolean stub and we want to collect the type information. |
| // However the GraphBuilder expects it to be on the instruction corresponding |
| // to the TestContext, therefore we have to store it here and not on the |
| // right hand operand. |
| set_to_boolean_types(oracle->ToBooleanTypes(right()->test_id())); |
| } |
| |
| |
| static bool IsTypeof(Expression* expr) { |
| UnaryOperation* maybe_unary = expr->AsUnaryOperation(); |
| return maybe_unary != NULL && maybe_unary->op() == Token::TYPEOF; |
| } |
| |
| |
| // Check for the pattern: typeof <expression> equals <string literal>. |
| static bool MatchLiteralCompareTypeof(Expression* left, |
| Token::Value op, |
| Expression* right, |
| Expression** expr, |
| Handle<String>* check) { |
| if (IsTypeof(left) && right->IsStringLiteral() && Token::IsEqualityOp(op)) { |
| *expr = left->AsUnaryOperation()->expression(); |
| *check = Handle<String>::cast(right->AsLiteral()->value()); |
| return true; |
| } |
| return false; |
| } |
| |
| |
| bool CompareOperation::IsLiteralCompareTypeof(Expression** expr, |
| Handle<String>* check) { |
| return MatchLiteralCompareTypeof(left_, op_, right_, expr, check) || |
| MatchLiteralCompareTypeof(right_, op_, left_, expr, check); |
| } |
| |
| |
| static bool IsVoidOfLiteral(Expression* expr) { |
| UnaryOperation* maybe_unary = expr->AsUnaryOperation(); |
| return maybe_unary != NULL && |
| maybe_unary->op() == Token::VOID && |
| maybe_unary->expression()->IsLiteral(); |
| } |
| |
| |
| // Check for the pattern: void <literal> equals <expression> or |
| // undefined equals <expression> |
| static bool MatchLiteralCompareUndefined(Expression* left, |
| Token::Value op, |
| Expression* right, |
| Expression** expr, |
| Isolate* isolate) { |
| if (IsVoidOfLiteral(left) && Token::IsEqualityOp(op)) { |
| *expr = right; |
| return true; |
| } |
| if (left->IsUndefinedLiteral(isolate) && Token::IsEqualityOp(op)) { |
| *expr = right; |
| return true; |
| } |
| return false; |
| } |
| |
| |
| bool CompareOperation::IsLiteralCompareUndefined( |
| Expression** expr, Isolate* isolate) { |
| return MatchLiteralCompareUndefined(left_, op_, right_, expr, isolate) || |
| MatchLiteralCompareUndefined(right_, op_, left_, expr, isolate); |
| } |
| |
| |
| // Check for the pattern: null equals <expression> |
| static bool MatchLiteralCompareNull(Expression* left, |
| Token::Value op, |
| Expression* right, |
| Expression** expr) { |
| if (left->IsNullLiteral() && Token::IsEqualityOp(op)) { |
| *expr = right; |
| return true; |
| } |
| return false; |
| } |
| |
| |
| bool CompareOperation::IsLiteralCompareNull(Expression** expr) { |
| return MatchLiteralCompareNull(left_, op_, right_, expr) || |
| MatchLiteralCompareNull(right_, op_, left_, expr); |
| } |
| |
| |
| // ---------------------------------------------------------------------------- |
| // Inlining support |
| |
| bool Declaration::IsInlineable() const { |
| return proxy()->var()->IsStackAllocated(); |
| } |
| |
| bool FunctionDeclaration::IsInlineable() const { |
| return false; |
| } |
| |
| |
| // ---------------------------------------------------------------------------- |
| // Recording of type feedback |
| |
| // TODO(rossberg): all RecordTypeFeedback functions should disappear |
| // once we use the common type field in the AST consistently. |
| |
| void Expression::RecordToBooleanTypeFeedback(TypeFeedbackOracle* oracle) { |
| set_to_boolean_types(oracle->ToBooleanTypes(test_id())); |
| } |
| |
| |
| bool Call::IsUsingCallFeedbackICSlot(Isolate* isolate) const { |
| CallType call_type = GetCallType(isolate); |
| if (call_type == POSSIBLY_EVAL_CALL) { |
| return false; |
| } |
| if (call_type == SUPER_CALL && !FLAG_vector_stores) { |
| return false; |
| } |
| return true; |
| } |
| |
| |
| bool Call::IsUsingCallFeedbackSlot(Isolate* isolate) const { |
| // SuperConstructorCall uses a CallConstructStub, which wants |
| // a Slot, in addition to any IC slots requested elsewhere. |
| return GetCallType(isolate) == SUPER_CALL; |
| } |
| |
| |
| void Call::AssignFeedbackVectorSlots(Isolate* isolate, FeedbackVectorSpec* spec, |
| FeedbackVectorSlotCache* cache) { |
| if (IsUsingCallFeedbackICSlot(isolate)) { |
| ic_slot_ = spec->AddCallICSlot(); |
| } |
| if (IsUsingCallFeedbackSlot(isolate)) { |
| stub_slot_ = spec->AddGeneralSlot(); |
| } |
| } |
| |
| |
| Call::CallType Call::GetCallType(Isolate* isolate) const { |
| VariableProxy* proxy = expression()->AsVariableProxy(); |
| if (proxy != NULL) { |
| if (proxy->var()->is_possibly_eval(isolate)) { |
| return POSSIBLY_EVAL_CALL; |
| } else if (proxy->var()->IsUnallocatedOrGlobalSlot()) { |
| return GLOBAL_CALL; |
| } else if (proxy->var()->IsLookupSlot()) { |
| return LOOKUP_SLOT_CALL; |
| } |
| } |
| |
| if (expression()->IsSuperCallReference()) return SUPER_CALL; |
| |
| Property* property = expression()->AsProperty(); |
| if (property != nullptr) { |
| bool is_super = property->IsSuperAccess(); |
| if (property->key()->IsPropertyName()) { |
| return is_super ? NAMED_SUPER_PROPERTY_CALL : NAMED_PROPERTY_CALL; |
| } else { |
| return is_super ? KEYED_SUPER_PROPERTY_CALL : KEYED_PROPERTY_CALL; |
| } |
| } |
| |
| return OTHER_CALL; |
| } |
| |
| |
| // ---------------------------------------------------------------------------- |
| // Implementation of AstVisitor |
| |
| void AstVisitor::VisitDeclarations(ZoneList<Declaration*>* declarations) { |
| for (int i = 0; i < declarations->length(); i++) { |
| Visit(declarations->at(i)); |
| } |
| } |
| |
| |
| void AstVisitor::VisitStatements(ZoneList<Statement*>* statements) { |
| for (int i = 0; i < statements->length(); i++) { |
| Statement* stmt = statements->at(i); |
| Visit(stmt); |
| if (stmt->IsJump()) break; |
| } |
| } |
| |
| |
| void AstVisitor::VisitExpressions(ZoneList<Expression*>* expressions) { |
| for (int i = 0; i < expressions->length(); i++) { |
| // The variable statement visiting code may pass NULL expressions |
| // to this code. Maybe this should be handled by introducing an |
| // undefined expression or literal? Revisit this code if this |
| // changes |
| Expression* expression = expressions->at(i); |
| if (expression != NULL) Visit(expression); |
| } |
| } |
| |
| |
| // ---------------------------------------------------------------------------- |
| // Regular expressions |
| |
| #define MAKE_ACCEPT(Name) \ |
| void* RegExp##Name::Accept(RegExpVisitor* visitor, void* data) { \ |
| return visitor->Visit##Name(this, data); \ |
| } |
| FOR_EACH_REG_EXP_TREE_TYPE(MAKE_ACCEPT) |
| #undef MAKE_ACCEPT |
| |
| #define MAKE_TYPE_CASE(Name) \ |
| RegExp##Name* RegExpTree::As##Name() { \ |
| return NULL; \ |
| } \ |
| bool RegExpTree::Is##Name() { return false; } |
| FOR_EACH_REG_EXP_TREE_TYPE(MAKE_TYPE_CASE) |
| #undef MAKE_TYPE_CASE |
| |
| #define MAKE_TYPE_CASE(Name) \ |
| RegExp##Name* RegExp##Name::As##Name() { \ |
| return this; \ |
| } \ |
| bool RegExp##Name::Is##Name() { return true; } |
| FOR_EACH_REG_EXP_TREE_TYPE(MAKE_TYPE_CASE) |
| #undef MAKE_TYPE_CASE |
| |
| |
| static Interval ListCaptureRegisters(ZoneList<RegExpTree*>* children) { |
| Interval result = Interval::Empty(); |
| for (int i = 0; i < children->length(); i++) |
| result = result.Union(children->at(i)->CaptureRegisters()); |
| return result; |
| } |
| |
| |
| Interval RegExpAlternative::CaptureRegisters() { |
| return ListCaptureRegisters(nodes()); |
| } |
| |
| |
| Interval RegExpDisjunction::CaptureRegisters() { |
| return ListCaptureRegisters(alternatives()); |
| } |
| |
| |
| Interval RegExpLookahead::CaptureRegisters() { |
| return body()->CaptureRegisters(); |
| } |
| |
| |
| Interval RegExpCapture::CaptureRegisters() { |
| Interval self(StartRegister(index()), EndRegister(index())); |
| return self.Union(body()->CaptureRegisters()); |
| } |
| |
| |
| Interval RegExpQuantifier::CaptureRegisters() { |
| return body()->CaptureRegisters(); |
| } |
| |
| |
| bool RegExpAssertion::IsAnchoredAtStart() { |
| return assertion_type() == RegExpAssertion::START_OF_INPUT; |
| } |
| |
| |
| bool RegExpAssertion::IsAnchoredAtEnd() { |
| return assertion_type() == RegExpAssertion::END_OF_INPUT; |
| } |
| |
| |
| bool RegExpAlternative::IsAnchoredAtStart() { |
| ZoneList<RegExpTree*>* nodes = this->nodes(); |
| for (int i = 0; i < nodes->length(); i++) { |
| RegExpTree* node = nodes->at(i); |
| if (node->IsAnchoredAtStart()) { return true; } |
| if (node->max_match() > 0) { return false; } |
| } |
| return false; |
| } |
| |
| |
| bool RegExpAlternative::IsAnchoredAtEnd() { |
| ZoneList<RegExpTree*>* nodes = this->nodes(); |
| for (int i = nodes->length() - 1; i >= 0; i--) { |
| RegExpTree* node = nodes->at(i); |
| if (node->IsAnchoredAtEnd()) { return true; } |
| if (node->max_match() > 0) { return false; } |
| } |
| return false; |
| } |
| |
| |
| bool RegExpDisjunction::IsAnchoredAtStart() { |
| ZoneList<RegExpTree*>* alternatives = this->alternatives(); |
| for (int i = 0; i < alternatives->length(); i++) { |
| if (!alternatives->at(i)->IsAnchoredAtStart()) |
| return false; |
| } |
| return true; |
| } |
| |
| |
| bool RegExpDisjunction::IsAnchoredAtEnd() { |
| ZoneList<RegExpTree*>* alternatives = this->alternatives(); |
| for (int i = 0; i < alternatives->length(); i++) { |
| if (!alternatives->at(i)->IsAnchoredAtEnd()) |
| return false; |
| } |
| return true; |
| } |
| |
| |
| bool RegExpLookahead::IsAnchoredAtStart() { |
| return is_positive() && body()->IsAnchoredAtStart(); |
| } |
| |
| |
| bool RegExpCapture::IsAnchoredAtStart() { |
| return body()->IsAnchoredAtStart(); |
| } |
| |
| |
| bool RegExpCapture::IsAnchoredAtEnd() { |
| return body()->IsAnchoredAtEnd(); |
| } |
| |
| |
| // Convert regular expression trees to a simple sexp representation. |
| // This representation should be different from the input grammar |
| // in as many cases as possible, to make it more difficult for incorrect |
| // parses to look as correct ones which is likely if the input and |
| // output formats are alike. |
| class RegExpUnparser final : public RegExpVisitor { |
| public: |
| RegExpUnparser(std::ostream& os, Zone* zone) : os_(os), zone_(zone) {} |
| void VisitCharacterRange(CharacterRange that); |
| #define MAKE_CASE(Name) \ |
| virtual void* Visit##Name(RegExp##Name*, void* data) override; |
| FOR_EACH_REG_EXP_TREE_TYPE(MAKE_CASE) |
| #undef MAKE_CASE |
| private: |
| std::ostream& os_; |
| Zone* zone_; |
| }; |
| |
| |
| void* RegExpUnparser::VisitDisjunction(RegExpDisjunction* that, void* data) { |
| os_ << "(|"; |
| for (int i = 0; i < that->alternatives()->length(); i++) { |
| os_ << " "; |
| that->alternatives()->at(i)->Accept(this, data); |
| } |
| os_ << ")"; |
| return NULL; |
| } |
| |
| |
| void* RegExpUnparser::VisitAlternative(RegExpAlternative* that, void* data) { |
| os_ << "(:"; |
| for (int i = 0; i < that->nodes()->length(); i++) { |
| os_ << " "; |
| that->nodes()->at(i)->Accept(this, data); |
| } |
| os_ << ")"; |
| return NULL; |
| } |
| |
| |
| void RegExpUnparser::VisitCharacterRange(CharacterRange that) { |
| os_ << AsUC16(that.from()); |
| if (!that.IsSingleton()) { |
| os_ << "-" << AsUC16(that.to()); |
| } |
| } |
| |
| |
| |
| void* RegExpUnparser::VisitCharacterClass(RegExpCharacterClass* that, |
| void* data) { |
| if (that->is_negated()) os_ << "^"; |
| os_ << "["; |
| for (int i = 0; i < that->ranges(zone_)->length(); i++) { |
| if (i > 0) os_ << " "; |
| VisitCharacterRange(that->ranges(zone_)->at(i)); |
| } |
| os_ << "]"; |
| return NULL; |
| } |
| |
| |
| void* RegExpUnparser::VisitAssertion(RegExpAssertion* that, void* data) { |
| switch (that->assertion_type()) { |
| case RegExpAssertion::START_OF_INPUT: |
| os_ << "@^i"; |
| break; |
| case RegExpAssertion::END_OF_INPUT: |
| os_ << "@$i"; |
| break; |
| case RegExpAssertion::START_OF_LINE: |
| os_ << "@^l"; |
| break; |
| case RegExpAssertion::END_OF_LINE: |
| os_ << "@$l"; |
| break; |
| case RegExpAssertion::BOUNDARY: |
| os_ << "@b"; |
| break; |
| case RegExpAssertion::NON_BOUNDARY: |
| os_ << "@B"; |
| break; |
| } |
| return NULL; |
| } |
| |
| |
| void* RegExpUnparser::VisitAtom(RegExpAtom* that, void* data) { |
| os_ << "'"; |
| Vector<const uc16> chardata = that->data(); |
| for (int i = 0; i < chardata.length(); i++) { |
| os_ << AsUC16(chardata[i]); |
| } |
| os_ << "'"; |
| return NULL; |
| } |
| |
| |
| void* RegExpUnparser::VisitText(RegExpText* that, void* data) { |
| if (that->elements()->length() == 1) { |
| that->elements()->at(0).tree()->Accept(this, data); |
| } else { |
| os_ << "(!"; |
| for (int i = 0; i < that->elements()->length(); i++) { |
| os_ << " "; |
| that->elements()->at(i).tree()->Accept(this, data); |
| } |
| os_ << ")"; |
| } |
| return NULL; |
| } |
| |
| |
| void* RegExpUnparser::VisitQuantifier(RegExpQuantifier* that, void* data) { |
| os_ << "(# " << that->min() << " "; |
| if (that->max() == RegExpTree::kInfinity) { |
| os_ << "- "; |
| } else { |
| os_ << that->max() << " "; |
| } |
| os_ << (that->is_greedy() ? "g " : that->is_possessive() ? "p " : "n "); |
| that->body()->Accept(this, data); |
| os_ << ")"; |
| return NULL; |
| } |
| |
| |
| void* RegExpUnparser::VisitCapture(RegExpCapture* that, void* data) { |
| os_ << "(^ "; |
| that->body()->Accept(this, data); |
| os_ << ")"; |
| return NULL; |
| } |
| |
| |
| void* RegExpUnparser::VisitLookahead(RegExpLookahead* that, void* data) { |
| os_ << "(-> " << (that->is_positive() ? "+ " : "- "); |
| that->body()->Accept(this, data); |
| os_ << ")"; |
| return NULL; |
| } |
| |
| |
| void* RegExpUnparser::VisitBackReference(RegExpBackReference* that, |
| void* data) { |
| os_ << "(<- " << that->index() << ")"; |
| return NULL; |
| } |
| |
| |
| void* RegExpUnparser::VisitEmpty(RegExpEmpty* that, void* data) { |
| os_ << '%'; |
| return NULL; |
| } |
| |
| |
| std::ostream& RegExpTree::Print(std::ostream& os, Zone* zone) { // NOLINT |
| RegExpUnparser unparser(os, zone); |
| Accept(&unparser, NULL); |
| return os; |
| } |
| |
| |
| RegExpDisjunction::RegExpDisjunction(ZoneList<RegExpTree*>* alternatives) |
| : alternatives_(alternatives) { |
| DCHECK(alternatives->length() > 1); |
| RegExpTree* first_alternative = alternatives->at(0); |
| min_match_ = first_alternative->min_match(); |
| max_match_ = first_alternative->max_match(); |
| for (int i = 1; i < alternatives->length(); i++) { |
| RegExpTree* alternative = alternatives->at(i); |
| min_match_ = Min(min_match_, alternative->min_match()); |
| max_match_ = Max(max_match_, alternative->max_match()); |
| } |
| } |
| |
| |
| static int IncreaseBy(int previous, int increase) { |
| if (RegExpTree::kInfinity - previous < increase) { |
| return RegExpTree::kInfinity; |
| } else { |
| return previous + increase; |
| } |
| } |
| |
| RegExpAlternative::RegExpAlternative(ZoneList<RegExpTree*>* nodes) |
| : nodes_(nodes) { |
| DCHECK(nodes->length() > 1); |
| min_match_ = 0; |
| max_match_ = 0; |
| for (int i = 0; i < nodes->length(); i++) { |
| RegExpTree* node = nodes->at(i); |
| int node_min_match = node->min_match(); |
| min_match_ = IncreaseBy(min_match_, node_min_match); |
| int node_max_match = node->max_match(); |
| max_match_ = IncreaseBy(max_match_, node_max_match); |
| } |
| } |
| |
| |
| CaseClause::CaseClause(Zone* zone, Expression* label, |
| ZoneList<Statement*>* statements, int pos) |
| : Expression(zone, pos), |
| label_(label), |
| statements_(statements), |
| compare_type_(Type::None(zone)) {} |
| |
| |
| uint32_t Literal::Hash() { |
| return raw_value()->IsString() |
| ? raw_value()->AsString()->hash() |
| : ComputeLongHash(double_to_uint64(raw_value()->AsNumber())); |
| } |
| |
| |
| // static |
| bool Literal::Match(void* literal1, void* literal2) { |
| const AstValue* x = static_cast<Literal*>(literal1)->raw_value(); |
| const AstValue* y = static_cast<Literal*>(literal2)->raw_value(); |
| return (x->IsString() && y->IsString() && x->AsString() == y->AsString()) || |
| (x->IsNumber() && y->IsNumber() && x->AsNumber() == y->AsNumber()); |
| } |
| |
| |
| } // namespace internal |
| } // namespace v8 |