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Defer allocation of constant literal properties.

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This moves building of constant properties and elements arrays for all
materialized literals into the compiler. The parser no longer allocates
while parsing ObjectLiteral and ArrayLiteral expressions.

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/61873003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17557 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
mstarzinger@chromium.org 2013-11-07 12:08:37 +00:00
parent ad3478bb2f
commit acac89008d
9 changed files with 241 additions and 229 deletions
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10
src/arm/full-codegen-arm.cc
View File

@ -1634,6 +1634,9 @@ void FullCodeGenerator::EmitAccessor(Expression* expression) {
void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
Comment cmnt(masm_, "[ ObjectLiteral");
int depth = 1;
expr->BuildConstantProperties(isolate(), &depth);
Handle<FixedArray> constant_properties = expr->constant_properties();
__ ldr(r3, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
__ ldr(r3, FieldMemOperand(r3, JSFunction::kLiteralsOffset));
@ -1648,7 +1651,7 @@ void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
__ mov(r0, Operand(Smi::FromInt(flags)));
int properties_count = constant_properties->length() / 2;
if ((FLAG_track_double_fields && expr->may_store_doubles()) ||
expr->depth() > 1 || Serializer::enabled() ||
depth > 1 || Serializer::enabled() ||
flags != ObjectLiteral::kFastElements ||
properties_count > FastCloneShallowObjectStub::kMaximumClonedProperties) {
__ Push(r3, r2, r1, r0);
@ -1767,6 +1770,8 @@ void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
void FullCodeGenerator::VisitArrayLiteral(ArrayLiteral* expr) {
Comment cmnt(masm_, "[ ArrayLiteral");
int depth = 1;
expr->BuildConstantElements(isolate(), &depth);
ZoneList<Expression*>* subexprs = expr->values();
int length = subexprs->length();
Handle<FixedArray> constant_elements = expr->constant_elements();
@ -1790,8 +1795,7 @@ void FullCodeGenerator::VisitArrayLiteral(ArrayLiteral* expr) {
__ CallStub(&stub);
__ IncrementCounter(
isolate()->counters()->cow_arrays_created_stub(), 1, r1, r2);
} else if (expr->depth() > 1 ||
Serializer::enabled() ||
} else if (depth > 1 || Serializer::enabled() ||
length > FastCloneShallowArrayStub::kMaximumClonedLength) {
__ Push(r3, r2, r1);
__ CallRuntime(Runtime::kCreateArrayLiteral, 3);

163
src/ast.cc
View File

@ -256,6 +256,169 @@ void ObjectLiteral::CalculateEmitStore(Zone* zone) {
}
bool ObjectLiteral::IsBoilerplateProperty(ObjectLiteral::Property* property) {
return property != NULL &&
property->kind() != ObjectLiteral::Property::PROTOTYPE;
}
void ObjectLiteral::BuildConstantProperties(Isolate* isolate, int* depth) {
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;
}
MaterializedLiteral* m_literal = property->value()->AsMaterializedLiteral();
if (m_literal != NULL) {
int inner_depth = 1;
m_literal->BuildConstants(isolate, &inner_depth);
if (inner_depth >= depth_acc) depth_acc = inner_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()->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);
set_is_simple(is_simple);
if (depth != NULL) *depth = depth_acc;
}
void ArrayLiteral::BuildConstantElements(Isolate* isolate, int* depth) {
if (!constant_elements_.is_null()) return;
// Allocate a fixed array to hold all the object literals.
Handle<JSArray> array =
isolate->factory()->NewJSArray(0, FAST_HOLEY_SMI_ELEMENTS);
isolate->factory()->SetElementsCapacityAndLength(
array, values()->length(), values()->length());
// Fill in the literals.
bool is_simple = true;
int depth_acc = 1;
bool is_holey = false;
for (int i = 0, n = values()->length(); i < n; i++) {
Expression* element = values()->at(i);
MaterializedLiteral* m_literal = element->AsMaterializedLiteral();
if (m_literal != NULL) {
int inner_depth = 1;
m_literal->BuildConstants(isolate, &inner_depth);
if (inner_depth + 1 > depth_acc) depth_acc = inner_depth + 1;
}
Handle<Object> boilerplate_value = GetBoilerplateValue(element, isolate);
if (boilerplate_value->IsTheHole()) {
is_holey = true;
} else if (boilerplate_value->IsUninitialized()) {
is_simple = false;
JSObject::SetOwnElement(
array, i, handle(Smi::FromInt(0), isolate), kNonStrictMode);
} else {
JSObject::SetOwnElement(array, i, boilerplate_value, kNonStrictMode);
}
}
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 && values()->length() > 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);
if (depth != NULL) *depth = depth_acc;
}
Handle<Object> MaterializedLiteral::GetBoilerplateValue(Expression* expression,
Isolate* isolate) {
if (expression->AsLiteral() != NULL) {
return expression->AsLiteral()->value();
}
if (CompileTimeValue::IsCompileTimeValue(expression)) {
return CompileTimeValue::GetValue(isolate, expression);
}
return isolate->factory()->uninitialized_value();
}
void MaterializedLiteral::BuildConstants(Isolate* isolate, int* depth) {
if (IsArrayLiteral()) {
return AsArrayLiteral()->BuildConstantElements(isolate, depth);
}
if (IsObjectLiteral()) {
return AsObjectLiteral()->BuildConstantProperties(isolate, depth);
}
ASSERT(IsRegExpLiteral());
}
void TargetCollector::AddTarget(Label* target, Zone* zone) {
// Add the label to the collector, but discard duplicates.
int length = targets_.length();

80
src/ast.h
View File

@ -1409,27 +1409,35 @@ class MaterializedLiteral : public Expression {
int literal_index() { return literal_index_; }
// A materialized literal is simple if the values consist of only
// constants and simple object and array literals.
bool is_simple() const { return is_simple_; }
int depth() const { return depth_; }
protected:
MaterializedLiteral(Isolate* isolate,
int literal_index,
bool is_simple,
int depth,
int pos)
: Expression(isolate, pos),
literal_index_(literal_index),
is_simple_(is_simple),
depth_(depth) {}
is_simple_(false) {}
// A materialized literal is simple if the values consist of only
// constants and simple object and array literals.
bool is_simple() const { return is_simple_; }
void set_is_simple(bool is_simple) { is_simple_ = is_simple; }
friend class CompileTimeValue;
// Populate the constant properties/elements fixed array.
void BuildConstants(Isolate* isolate, int* depth);
friend class ArrayLiteral;
friend class ObjectLiteral;
// If the expression is a literal, return the literal value;
// if the expression is a materialized literal and is simple return a
// compile time value as encoded by CompileTimeValue::GetValue().
// Otherwise, return undefined literal as the placeholder
// in the object literal boilerplate.
Handle<Object> GetBoilerplateValue(Expression* expression, Isolate* isolate);
private:
int literal_index_;
bool is_simple_;
int depth_;
};
@ -1493,6 +1501,12 @@ class ObjectLiteral V8_FINAL : public MaterializedLiteral {
bool may_store_doubles() const { return may_store_doubles_; }
bool has_function() const { return has_function_; }
// Decide if a property should be in the object boilerplate.
static bool IsBoilerplateProperty(Property* property);
// Populate the constant properties fixed array.
void BuildConstantProperties(Isolate* isolate, int* depth = NULL);
// Mark all computed expressions that are bound to a key that
// is shadowed by a later occurrence of the same key. For the
// marked expressions, no store code is emitted.
@ -1512,25 +1526,22 @@ class ObjectLiteral V8_FINAL : public MaterializedLiteral {
protected:
ObjectLiteral(Isolate* isolate,
Handle<FixedArray> constant_properties,
ZoneList<Property*>* properties,
int literal_index,
bool is_simple,
bool fast_elements,
int depth,
bool may_store_doubles,
int boilerplate_properties,
bool has_function,
int pos)
: MaterializedLiteral(isolate, literal_index, is_simple, depth, pos),
constant_properties_(constant_properties),
: MaterializedLiteral(isolate, literal_index, pos),
properties_(properties),
fast_elements_(fast_elements),
may_store_doubles_(may_store_doubles),
boilerplate_properties_(boilerplate_properties),
fast_elements_(false),
may_store_doubles_(false),
has_function_(has_function) {}
private:
Handle<FixedArray> constant_properties_;
ZoneList<Property*>* properties_;
int boilerplate_properties_;
bool fast_elements_;
bool may_store_doubles_;
bool has_function_;
@ -1551,7 +1562,7 @@ class RegExpLiteral V8_FINAL : public MaterializedLiteral {
Handle<String> flags,
int literal_index,
int pos)
: MaterializedLiteral(isolate, literal_index, false, 1, pos),
: MaterializedLiteral(isolate, literal_index, pos),
pattern_(pattern),
flags_(flags) {}
@ -1575,16 +1586,15 @@ class ArrayLiteral V8_FINAL : public MaterializedLiteral {
return BailoutId(first_element_id_.ToInt() + i);
}
// Populate the constant elements fixed array.
void BuildConstantElements(Isolate* isolate, int* depth = NULL);
protected:
ArrayLiteral(Isolate* isolate,
Handle<FixedArray> constant_elements,
ZoneList<Expression*>* values,
int literal_index,
bool is_simple,
int depth,
int pos)
: MaterializedLiteral(isolate, literal_index, is_simple, depth, pos),
constant_elements_(constant_elements),
: MaterializedLiteral(isolate, literal_index, pos),
values_(values),
first_element_id_(ReserveIdRange(isolate, values->length())) {}
@ -3066,18 +3076,14 @@ class AstNodeFactory V8_FINAL BASE_EMBEDDED {
}
ObjectLiteral* NewObjectLiteral(
Handle<FixedArray> constant_properties,
ZoneList<ObjectLiteral::Property*>* properties,
int literal_index,
bool is_simple,
bool fast_elements,
int depth,
bool may_store_doubles,
int boilerplate_properties,
bool has_function,
int pos) {
ObjectLiteral* lit = new(zone_) ObjectLiteral(
isolate_, constant_properties, properties, literal_index,
is_simple, fast_elements, depth, may_store_doubles, has_function, pos);
isolate_, properties, literal_index, boilerplate_properties,
has_function, pos);
VISIT_AND_RETURN(ObjectLiteral, lit)
}
@ -3099,15 +3105,11 @@ class AstNodeFactory V8_FINAL BASE_EMBEDDED {
VISIT_AND_RETURN(RegExpLiteral, lit);
}
ArrayLiteral* NewArrayLiteral(Handle<FixedArray> constant_elements,
ZoneList<Expression*>* values,
ArrayLiteral* NewArrayLiteral(ZoneList<Expression*>* values,
int literal_index,
bool is_simple,
int depth,
int pos) {
ArrayLiteral* lit = new(zone_) ArrayLiteral(
isolate_, constant_elements, values, literal_index, is_simple,
depth, pos);
isolate_, values, literal_index, pos);
VISIT_AND_RETURN(ArrayLiteral, lit)
}

2
src/hydrogen.cc
View File

@ -4310,6 +4310,7 @@ void HOptimizedGraphBuilder::VisitObjectLiteral(ObjectLiteral* expr) {
ASSERT(!HasStackOverflow());
ASSERT(current_block() != NULL);
ASSERT(current_block()->HasPredecessor());
expr->BuildConstantProperties(isolate());
Handle<JSFunction> closure = function_state()->compilation_info()->closure();
HInstruction* literal;
@ -4431,6 +4432,7 @@ void HOptimizedGraphBuilder::VisitArrayLiteral(ArrayLiteral* expr) {
ASSERT(!HasStackOverflow());
ASSERT(current_block() != NULL);
ASSERT(current_block()->HasPredecessor());
expr->BuildConstantElements(isolate());
ZoneList<Expression*>* subexprs = expr->values();
int length = subexprs->length();
HInstruction* literal;

10
src/ia32/full-codegen-ia32.cc
View File

@ -1574,6 +1574,9 @@ void FullCodeGenerator::EmitAccessor(Expression* expression) {
void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
Comment cmnt(masm_, "[ ObjectLiteral");
int depth = 1;
expr->BuildConstantProperties(isolate(), &depth);
Handle<FixedArray> constant_properties = expr->constant_properties();
int flags = expr->fast_elements()
? ObjectLiteral::kFastElements
@ -1583,7 +1586,7 @@ void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
: ObjectLiteral::kNoFlags;
int properties_count = constant_properties->length() / 2;
if ((FLAG_track_double_fields && expr->may_store_doubles()) ||
expr->depth() > 1 || Serializer::enabled() ||
depth > 1 || Serializer::enabled() ||
flags != ObjectLiteral::kFastElements ||
properties_count > FastCloneShallowObjectStub::kMaximumClonedProperties) {
__ mov(edi, Operand(ebp, JavaScriptFrameConstants::kFunctionOffset));
@ -1702,6 +1705,8 @@ void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
void FullCodeGenerator::VisitArrayLiteral(ArrayLiteral* expr) {
Comment cmnt(masm_, "[ ArrayLiteral");
int depth = 1;
expr->BuildConstantElements(isolate(), &depth);
ZoneList<Expression*>* subexprs = expr->values();
int length = subexprs->length();
Handle<FixedArray> constant_elements = expr->constant_elements();
@ -1728,8 +1733,7 @@ void FullCodeGenerator::VisitArrayLiteral(ArrayLiteral* expr) {
DONT_TRACK_ALLOCATION_SITE,
length);
__ CallStub(&stub);
} else if (expr->depth() > 1 ||
Serializer::enabled() ||
} else if (depth > 1 || Serializer::enabled() ||
length > FastCloneShallowArrayStub::kMaximumClonedLength) {
__ mov(ebx, Operand(ebp, JavaScriptFrameConstants::kFunctionOffset));
__ push(FieldOperand(ebx, JSFunction::kLiteralsOffset));

10
src/mips/full-codegen-mips.cc
View File

@ -1644,6 +1644,9 @@ void FullCodeGenerator::EmitAccessor(Expression* expression) {
void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
Comment cmnt(masm_, "[ ObjectLiteral");
int depth = 1;
expr->BuildConstantProperties(isolate(), &depth);
Handle<FixedArray> constant_properties = expr->constant_properties();
__ lw(a3, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
__ lw(a3, FieldMemOperand(a3, JSFunction::kLiteralsOffset));
@ -1658,7 +1661,7 @@ void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
__ li(a0, Operand(Smi::FromInt(flags)));
int properties_count = constant_properties->length() / 2;
if ((FLAG_track_double_fields && expr->may_store_doubles()) ||
expr->depth() > 1 || Serializer::enabled() ||
depth > 1 || Serializer::enabled() ||
flags != ObjectLiteral::kFastElements ||
properties_count > FastCloneShallowObjectStub::kMaximumClonedProperties) {
__ Push(a3, a2, a1, a0);
@ -1777,6 +1780,8 @@ void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
void FullCodeGenerator::VisitArrayLiteral(ArrayLiteral* expr) {
Comment cmnt(masm_, "[ ArrayLiteral");
int depth = 1;
expr->BuildConstantElements(isolate(), &depth);
ZoneList<Expression*>* subexprs = expr->values();
int length = subexprs->length();
@ -1803,8 +1808,7 @@ void FullCodeGenerator::VisitArrayLiteral(ArrayLiteral* expr) {
__ CallStub(&stub);
__ IncrementCounter(isolate()->counters()->cow_arrays_created_stub(),
1, a1, a2);
} else if (expr->depth() > 1 ||
Serializer::enabled() ||
} else if (depth > 1 || Serializer::enabled() ||
length > FastCloneShallowArrayStub::kMaximumClonedLength) {
__ Push(a3, a2, a1);
__ CallRuntime(Runtime::kCreateArrayLiteral, 3);

166
src/parser.cc
View File

@ -3660,61 +3660,7 @@ Expression* Parser::ParseArrayLiteral(bool* ok) {
// Update the scope information before the pre-parsing bailout.
int literal_index = current_function_state_->NextMaterializedLiteralIndex();
// Allocate a fixed array to hold all the object literals.
Handle<JSArray> array =
isolate()->factory()->NewJSArray(0, FAST_HOLEY_SMI_ELEMENTS);
isolate()->factory()->SetElementsCapacityAndLength(
array, values->length(), values->length());
// Fill in the literals.
Heap* heap = isolate()->heap();
bool is_simple = true;
int depth = 1;
bool is_holey = false;
for (int i = 0, n = values->length(); i < n; i++) {
MaterializedLiteral* m_literal = values->at(i)->AsMaterializedLiteral();
if (m_literal != NULL && m_literal->depth() + 1 > depth) {
depth = m_literal->depth() + 1;
}
Handle<Object> boilerplate_value = GetBoilerplateValue(values->at(i));
if (boilerplate_value->IsTheHole()) {
is_holey = true;
} else if (boilerplate_value->IsUninitialized()) {
is_simple = false;
JSObject::SetOwnElement(
array, i, handle(Smi::FromInt(0), isolate()), kNonStrictMode);
} else {
JSObject::SetOwnElement(array, i, boilerplate_value, kNonStrictMode);
}
}
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 == 1 && values->length() > 0 &&
array->HasFastSmiOrObjectElements()) {
element_values->set_map(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);
return factory()->NewArrayLiteral(
literals, values, literal_index, is_simple, depth, pos);
}
bool Parser::IsBoilerplateProperty(ObjectLiteral::Property* property) {
return property != NULL &&
property->kind() != ObjectLiteral::Property::PROTOTYPE;
return factory()->NewArrayLiteral(values, literal_index, pos);
}
@ -3761,89 +3707,6 @@ Handle<FixedArray> CompileTimeValue::GetElements(Handle<FixedArray> value) {
}
Handle<Object> Parser::GetBoilerplateValue(Expression* expression) {
if (expression->AsLiteral() != NULL) {
return expression->AsLiteral()->value();
}
if (CompileTimeValue::IsCompileTimeValue(expression)) {
return CompileTimeValue::GetValue(isolate(), expression);
}
return isolate()->factory()->uninitialized_value();
}
void Parser::BuildObjectLiteralConstantProperties(
ZoneList<ObjectLiteral::Property*>* properties,
Handle<FixedArray> constant_properties,
bool* is_simple,
bool* fast_elements,
int* depth,
bool* may_store_doubles) {
int position = 0;
// Accumulate the value in local variables and store it at the end.
bool is_simple_acc = 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_acc = false;
continue;
}
MaterializedLiteral* m_literal = property->value()->AsMaterializedLiteral();
if (m_literal != NULL && 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()->value();
Handle<Object> value = GetBoilerplateValue(property->value());
// 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_acc = is_simple_acc && !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);
}
*fast_elements =
(max_element_index <= 32) || ((2 * elements) >= max_element_index);
*is_simple = is_simple_acc;
*depth = depth_acc;
}
Expression* Parser::ParseObjectLiteral(bool* ok) {
// ObjectLiteral ::
// '{' (
@ -3912,7 +3775,7 @@ Expression* Parser::ParseObjectLiteral(bool* ok) {
// Specification only allows zero parameters for get and one for set.
ObjectLiteral::Property* property =
factory()->NewObjectLiteralProperty(is_getter, value, next_pos);
if (IsBoilerplateProperty(property)) {
if (ObjectLiteral::IsBoilerplateProperty(property)) {
number_of_boilerplate_properties++;
}
properties->Add(property, zone());
@ -3984,7 +3847,9 @@ Expression* Parser::ParseObjectLiteral(bool* ok) {
}
// Count CONSTANT or COMPUTED properties to maintain the enumeration order.
if (IsBoilerplateProperty(property)) number_of_boilerplate_properties++;
if (ObjectLiteral::IsBoilerplateProperty(property)) {
number_of_boilerplate_properties++;
}
properties->Add(property, zone());
// TODO(1240767): Consider allowing trailing comma.
@ -4000,26 +3865,9 @@ Expression* Parser::ParseObjectLiteral(bool* ok) {
// Computation of literal_index must happen before pre parse bailout.
int literal_index = current_function_state_->NextMaterializedLiteralIndex();
Handle<FixedArray> constant_properties = isolate()->factory()->NewFixedArray(
number_of_boilerplate_properties * 2, TENURED);
bool is_simple = true;
bool fast_elements = true;
int depth = 1;
bool may_store_doubles = false;
BuildObjectLiteralConstantProperties(properties,
constant_properties,
&is_simple,
&fast_elements,
&depth,
&may_store_doubles);
return factory()->NewObjectLiteral(constant_properties,
properties,
return factory()->NewObjectLiteral(properties,
literal_index,
is_simple,
fast_elements,
depth,
may_store_doubles,
number_of_boilerplate_properties,
has_function,
pos);
}

19
src/parser.h
View File

@ -653,25 +653,6 @@ class Parser : public ParserBase {
Expression* ParseObjectLiteral(bool* ok);
Expression* ParseRegExpLiteral(bool seen_equal, bool* ok);
// Populate the constant properties fixed array for a materialized object
// literal.
void BuildObjectLiteralConstantProperties(
ZoneList<ObjectLiteral::Property*>* properties,
Handle<FixedArray> constants,
bool* is_simple,
bool* fast_elements,
int* depth,
bool* may_store_doubles);
// Decide if a property should be in the object boilerplate.
bool IsBoilerplateProperty(ObjectLiteral::Property* property);
// If the expression is a literal, return the literal value;
// if the expression is a materialized literal and is simple return a
// compile time value as encoded by CompileTimeValue::GetValue().
// Otherwise, return undefined literal as the placeholder
// in the object literal boilerplate.
Handle<Object> GetBoilerplateValue(Expression* expression);
// Initialize the components of a for-in / for-of statement.
void InitializeForEachStatement(ForEachStatement* stmt,
Expression* each,

10
src/x64/full-codegen-x64.cc
View File

@ -1595,6 +1595,9 @@ void FullCodeGenerator::EmitAccessor(Expression* expression) {
void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
Comment cmnt(masm_, "[ ObjectLiteral");
int depth = 1;
expr->BuildConstantProperties(isolate(), &depth);
Handle<FixedArray> constant_properties = expr->constant_properties();
int flags = expr->fast_elements()
? ObjectLiteral::kFastElements
@ -1604,7 +1607,7 @@ void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
: ObjectLiteral::kNoFlags;
int properties_count = constant_properties->length() / 2;
if ((FLAG_track_double_fields && expr->may_store_doubles()) ||
expr->depth() > 1 || Serializer::enabled() ||
depth > 1 || Serializer::enabled() ||
flags != ObjectLiteral::kFastElements ||
properties_count > FastCloneShallowObjectStub::kMaximumClonedProperties) {
__ movq(rdi, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
@ -1723,6 +1726,8 @@ void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
void FullCodeGenerator::VisitArrayLiteral(ArrayLiteral* expr) {
Comment cmnt(masm_, "[ ArrayLiteral");
int depth = 1;
expr->BuildConstantElements(isolate(), &depth);
ZoneList<Expression*>* subexprs = expr->values();
int length = subexprs->length();
Handle<FixedArray> constant_elements = expr->constant_elements();
@ -1749,8 +1754,7 @@ void FullCodeGenerator::VisitArrayLiteral(ArrayLiteral* expr) {
DONT_TRACK_ALLOCATION_SITE,
length);
__ CallStub(&stub);
} else if (expr->depth() > 1 ||
Serializer::enabled() ||
} else if (depth > 1 || Serializer::enabled() ||
length > FastCloneShallowArrayStub::kMaximumClonedLength) {
__ movq(rbx, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
__ push(FieldOperand(rbx, JSFunction::kLiteralsOffset));