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cobalt / cobalt / 4db9f13a160f367210321ab353f1fd251699bffb / . / third_party / v8 / src / objects / objects.cc
blob: 5c67fa388fb93f468f0aaa8b2f2f05b2b01be74d [file] [log] [blame]
// Copyright 2015 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/objects/objects.h"
#include <algorithm>
#include <cmath>
#include <memory>
#include <sstream>
#include <vector>
#include "src/api/api-arguments-inl.h"
#include "src/api/api-natives.h"
#include "src/api/api.h"
#include "src/ast/ast.h"
#include "src/ast/scopes.h"
#include "src/base/bits.h"
#include "src/base/debug/stack_trace.h"
#include "src/base/overflowing-math.h"
#include "src/base/utils/random-number-generator.h"
#include "src/builtins/accessors.h"
#include "src/builtins/builtins.h"
#include "src/codegen/compiler.h"
#include "src/common/globals.h"
#include "src/common/message-template.h"
#include "src/date/date.h"
#include "src/debug/debug.h"
#include "src/diagnostics/code-tracer.h"
#include "src/execution/arguments.h"
#include "src/execution/execution.h"
#include "src/execution/frames-inl.h"
#include "src/execution/isolate-inl.h"
#include "src/execution/isolate-utils-inl.h"
#include "src/execution/isolate-utils.h"
#include "src/execution/microtask-queue.h"
#include "src/execution/protectors-inl.h"
#include "src/heap/factory-inl.h"
#include "src/heap/heap-inl.h"
#include "src/heap/local-factory-inl.h"
#include "src/heap/read-only-heap.h"
#include "src/ic/ic.h"
#include "src/init/bootstrapper.h"
#include "src/logging/counters-inl.h"
#include "src/logging/counters.h"
#include "src/logging/log.h"
#include "src/objects/allocation-site-inl.h"
#include "src/objects/allocation-site-scopes.h"
#include "src/objects/api-callbacks.h"
#include "src/objects/arguments-inl.h"
#include "src/objects/bigint.h"
#include "src/objects/cell-inl.h"
#include "src/objects/code-inl.h"
#include "src/objects/compilation-cache-table-inl.h"
#include "src/objects/debug-objects-inl.h"
#include "src/objects/elements.h"
#include "src/objects/embedder-data-array-inl.h"
#include "src/objects/field-index-inl.h"
#include "src/objects/field-index.h"
#include "src/objects/field-type.h"
#include "src/objects/foreign.h"
#include "src/objects/frame-array-inl.h"
#include "src/objects/free-space-inl.h"
#include "src/objects/function-kind.h"
#include "src/objects/hash-table-inl.h"
#include "src/objects/instance-type.h"
#include "src/objects/js-array-inl.h"
#include "src/objects/keys.h"
#include "src/objects/lookup-inl.h"
#include "src/objects/map-updater.h"
#include "src/objects/objects-body-descriptors-inl.h"
#include "src/objects/objects-inl.h"
#include "src/objects/property-details.h"
#include "src/roots/roots.h"
#include "src/snapshot/deserializer.h"
#include "src/utils/identity-map.h"
#ifdef V8_INTL_SUPPORT
#include "src/objects/js-break-iterator.h"
#include "src/objects/js-collator.h"
#endif // V8_INTL_SUPPORT
#include "src/objects/js-collection-inl.h"
#ifdef V8_INTL_SUPPORT
#include "src/objects/js-date-time-format.h"
#endif // V8_INTL_SUPPORT
#include "src/objects/js-generator-inl.h"
#ifdef V8_INTL_SUPPORT
#include "src/objects/js-list-format.h"
#include "src/objects/js-locale.h"
#include "src/objects/js-number-format.h"
#include "src/objects/js-plural-rules.h"
#endif // V8_INTL_SUPPORT
#include "src/objects/js-regexp-inl.h"
#include "src/objects/js-regexp-string-iterator.h"
#ifdef V8_INTL_SUPPORT
#include "src/objects/js-relative-time-format.h"
#include "src/objects/js-segment-iterator.h"
#include "src/objects/js-segmenter.h"
#include "src/objects/js-segments.h"
#endif // V8_INTL_SUPPORT
#include "src/codegen/source-position-table.h"
#include "src/objects/js-weak-refs-inl.h"
#include "src/objects/literal-objects-inl.h"
#include "src/objects/map-inl.h"
#include "src/objects/map.h"
#include "src/objects/microtask-inl.h"
#include "src/objects/module-inl.h"
#include "src/objects/promise-inl.h"
#include "src/objects/property-descriptor-object-inl.h"
#include "src/objects/property-descriptor.h"
#include "src/objects/prototype.h"
#include "src/objects/slots-atomic-inl.h"
#include "src/objects/stack-frame-info-inl.h"
#include "src/objects/string-comparator.h"
#include "src/objects/string-set-inl.h"
#include "src/objects/struct-inl.h"
#include "src/objects/template-objects-inl.h"
#include "src/objects/transitions-inl.h"
#include "src/parsing/preparse-data.h"
#include "src/regexp/regexp.h"
#include "src/strings/string-builder-inl.h"
#include "src/strings/string-search.h"
#include "src/strings/string-stream.h"
#include "src/strings/unicode-decoder.h"
#include "src/strings/unicode-inl.h"
#include "src/utils/ostreams.h"
#include "src/utils/utils-inl.h"
#include "src/wasm/wasm-engine.h"
#include "src/wasm/wasm-objects.h"
#include "src/zone/zone.h"
namespace v8 {
namespace internal {
ShouldThrow GetShouldThrow(Isolate* isolate, Maybe<ShouldThrow> should_throw) {
if (should_throw.IsJust()) return should_throw.FromJust();
LanguageMode mode = isolate->context().scope_info().language_mode();
if (mode == LanguageMode::kStrict) return kThrowOnError;
for (StackFrameIterator it(isolate); !it.done(); it.Advance()) {
if (!(it.frame()->is_optimized() || it.frame()->is_interpreted())) {
continue;
}
// Get the language mode from closure.
JavaScriptFrame* js_frame = static_cast<JavaScriptFrame*>(it.frame());
std::vector<SharedFunctionInfo> functions;
js_frame->GetFunctions(&functions);
LanguageMode closure_language_mode = functions.back().language_mode();
if (closure_language_mode > mode) {
mode = closure_language_mode;
}
break;
}
return is_sloppy(mode) ? kDontThrow : kThrowOnError;
}
bool ComparisonResultToBool(Operation op, ComparisonResult result) {
switch (op) {
case Operation::kLessThan:
return result == ComparisonResult::kLessThan;
case Operation::kLessThanOrEqual:
return result == ComparisonResult::kLessThan ||
result == ComparisonResult::kEqual;
case Operation::kGreaterThan:
return result == ComparisonResult::kGreaterThan;
case Operation::kGreaterThanOrEqual:
return result == ComparisonResult::kGreaterThan ||
result == ComparisonResult::kEqual;
default:
break;
}
UNREACHABLE();
}
std::ostream& operator<<(std::ostream& os, InstanceType instance_type) {
switch (instance_type) {
#define WRITE_TYPE(TYPE) \
case TYPE: \
return os << #TYPE;
INSTANCE_TYPE_LIST(WRITE_TYPE)
#undef WRITE_TYPE
}
UNREACHABLE();
}
Handle<FieldType> Object::OptimalType(Isolate* isolate,
Representation representation) {
if (representation.IsNone()) return FieldType::None(isolate);
if (FLAG_track_field_types) {
if (representation.IsHeapObject() && IsHeapObject()) {
// We can track only JavaScript objects with stable maps.
Handle<Map> map(HeapObject::cast(*this).map(), isolate);
if (map->is_stable() && map->IsJSReceiverMap()) {
return FieldType::Class(map, isolate);
}
}
}
return FieldType::Any(isolate);
}
Handle<Object> Object::NewStorageFor(Isolate* isolate, Handle<Object> object,
Representation representation) {
if (!representation.IsDouble()) return object;
auto result = isolate->factory()->NewHeapNumberWithHoleNaN();
if (object->IsUninitialized(isolate)) {
result->set_value_as_bits(kHoleNanInt64);
} else if (object->IsHeapNumber()) {
// Ensure that all bits of the double value are preserved.
result->set_value_as_bits(HeapNumber::cast(*object).value_as_bits());
} else {
result->set_value(object->Number());
}
return result;
}
Handle<Object> Object::WrapForRead(Isolate* isolate, Handle<Object> object,
Representation representation) {
DCHECK(!object->IsUninitialized(isolate));
if (!representation.IsDouble()) {
DCHECK(object->FitsRepresentation(representation));
return object;
}
return isolate->factory()->NewHeapNumberFromBits(
HeapNumber::cast(*object).value_as_bits());
}
MaybeHandle<JSReceiver> Object::ToObjectImpl(Isolate* isolate,
Handle<Object> object,
const char* method_name) {
DCHECK(!object->IsJSReceiver()); // Use ToObject() for fast path.
Handle<Context> native_context = isolate->native_context();
Handle<JSFunction> constructor;
if (object->IsSmi()) {
constructor = handle(native_context->number_function(), isolate);
} else {
int constructor_function_index =
Handle<HeapObject>::cast(object)->map().GetConstructorFunctionIndex();
if (constructor_function_index == Map::kNoConstructorFunctionIndex) {
if (method_name != nullptr) {
THROW_NEW_ERROR(
isolate,
NewTypeError(
MessageTemplate::kCalledOnNullOrUndefined,
isolate->factory()->NewStringFromAsciiChecked(method_name)),
JSReceiver);
}
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kUndefinedOrNullToObject),
JSReceiver);
}
constructor = handle(
JSFunction::cast(native_context->get(constructor_function_index)),
isolate);
}
Handle<JSObject> result = isolate->factory()->NewJSObject(constructor);
Handle<JSPrimitiveWrapper>::cast(result)->set_value(*object);
return result;
}
// ES6 section 9.2.1.2, OrdinaryCallBindThis for sloppy callee.
// static
MaybeHandle<JSReceiver> Object::ConvertReceiver(Isolate* isolate,
Handle<Object> object) {
if (object->IsJSReceiver()) return Handle<JSReceiver>::cast(object);
if (object->IsNullOrUndefined(isolate)) {
return isolate->global_proxy();
}
return Object::ToObject(isolate, object);
}
// static
MaybeHandle<Object> Object::ConvertToNumberOrNumeric(Isolate* isolate,
Handle<Object> input,
Conversion mode) {
while (true) {
if (input->IsNumber()) {
return input;
}
if (input->IsString()) {
return String::ToNumber(isolate, Handle<String>::cast(input));
}
if (input->IsOddball()) {
return Oddball::ToNumber(isolate, Handle<Oddball>::cast(input));
}
if (input->IsSymbol()) {
THROW_NEW_ERROR(isolate, NewTypeError(MessageTemplate::kSymbolToNumber),
Object);
}
if (input->IsBigInt()) {
if (mode == Conversion::kToNumeric) return input;
DCHECK_EQ(mode, Conversion::kToNumber);
THROW_NEW_ERROR(isolate, NewTypeError(MessageTemplate::kBigIntToNumber),
Object);
}
ASSIGN_RETURN_ON_EXCEPTION(
isolate, input,
JSReceiver::ToPrimitive(Handle<JSReceiver>::cast(input),
ToPrimitiveHint::kNumber),
Object);
}
}
// static
MaybeHandle<Object> Object::ConvertToInteger(Isolate* isolate,
Handle<Object> input) {
ASSIGN_RETURN_ON_EXCEPTION(
isolate, input,
ConvertToNumberOrNumeric(isolate, input, Conversion::kToNumber), Object);
if (input->IsSmi()) return input;
return isolate->factory()->NewNumber(DoubleToInteger(input->Number()));
}
// static
MaybeHandle<Object> Object::ConvertToInt32(Isolate* isolate,
Handle<Object> input) {
ASSIGN_RETURN_ON_EXCEPTION(
isolate, input,
ConvertToNumberOrNumeric(isolate, input, Conversion::kToNumber), Object);
if (input->IsSmi()) return input;
return isolate->factory()->NewNumberFromInt(DoubleToInt32(input->Number()));
}
// static
MaybeHandle<Object> Object::ConvertToUint32(Isolate* isolate,
Handle<Object> input) {
ASSIGN_RETURN_ON_EXCEPTION(
isolate, input,
ConvertToNumberOrNumeric(isolate, input, Conversion::kToNumber), Object);
if (input->IsSmi()) return handle(Smi::cast(*input).ToUint32Smi(), isolate);
return isolate->factory()->NewNumberFromUint(DoubleToUint32(input->Number()));
}
// static
MaybeHandle<Name> Object::ConvertToName(Isolate* isolate,
Handle<Object> input) {
ASSIGN_RETURN_ON_EXCEPTION(
isolate, input, Object::ToPrimitive(input, ToPrimitiveHint::kString),
Name);
if (input->IsName()) return Handle<Name>::cast(input);
return ToString(isolate, input);
}
// ES6 7.1.14
// static
MaybeHandle<Object> Object::ConvertToPropertyKey(Isolate* isolate,
Handle<Object> value) {
// 1. Let key be ToPrimitive(argument, hint String).
MaybeHandle<Object> maybe_key =
Object::ToPrimitive(value, ToPrimitiveHint::kString);
// 2. ReturnIfAbrupt(key).
Handle<Object> key;
if (!maybe_key.ToHandle(&key)) return key;
// 3. If Type(key) is Symbol, then return key.
if (key->IsSymbol()) return key;
// 4. Return ToString(key).
// Extending spec'ed behavior, we'd be happy to return an element index.
if (key->IsSmi()) return key;
if (key->IsHeapNumber()) {
uint32_t uint_value;
if (value->ToArrayLength(&uint_value) &&
uint_value <= static_cast<uint32_t>(Smi::kMaxValue)) {
return handle(Smi::FromInt(static_cast<int>(uint_value)), isolate);
}
}
return Object::ToString(isolate, key);
}
// static
MaybeHandle<String> Object::ConvertToString(Isolate* isolate,
Handle<Object> input) {
while (true) {
if (input->IsOddball()) {
return handle(Handle<Oddball>::cast(input)->to_string(), isolate);
}
if (input->IsNumber()) {
return isolate->factory()->NumberToString(input);
}
if (input->IsSymbol()) {
THROW_NEW_ERROR(isolate, NewTypeError(MessageTemplate::kSymbolToString),
String);
}
if (input->IsBigInt()) {
return BigInt::ToString(isolate, Handle<BigInt>::cast(input));
}
ASSIGN_RETURN_ON_EXCEPTION(
isolate, input,
JSReceiver::ToPrimitive(Handle<JSReceiver>::cast(input),
ToPrimitiveHint::kString),
String);
// The previous isString() check happened in Object::ToString and thus we
// put it at the end of the loop in this helper.
if (input->IsString()) {
return Handle<String>::cast(input);
}
}
}
namespace {
bool IsErrorObject(Isolate* isolate, Handle<Object> object) {
if (!object->IsJSReceiver()) return false;
Handle<Symbol> symbol = isolate->factory()->stack_trace_symbol();
return JSReceiver::HasOwnProperty(Handle<JSReceiver>::cast(object), symbol)
.FromMaybe(false);
}
Handle<String> AsStringOrEmpty(Isolate* isolate, Handle<Object> object) {
return object->IsString() ? Handle<String>::cast(object)
: isolate->factory()->empty_string();
}
Handle<String> NoSideEffectsErrorToString(Isolate* isolate,
Handle<JSReceiver> error) {
Handle<Name> name_key = isolate->factory()->name_string();
Handle<Object> name = JSReceiver::GetDataProperty(error, name_key);
Handle<String> name_str = AsStringOrEmpty(isolate, name);
Handle<Name> msg_key = isolate->factory()->message_string();
Handle<Object> msg = JSReceiver::GetDataProperty(error, msg_key);
Handle<String> msg_str = AsStringOrEmpty(isolate, msg);
if (name_str->length() == 0) return msg_str;
if (msg_str->length() == 0) return name_str;
IncrementalStringBuilder builder(isolate);
builder.AppendString(name_str);
builder.AppendCString(": ");
if (builder.Length() + msg_str->length() <= String::kMaxLength) {
builder.AppendString(msg_str);
} else {
builder.AppendCString("<a very large string>");
}
return builder.Finish().ToHandleChecked();
}
} // namespace
// static
Handle<String> Object::NoSideEffectsToString(Isolate* isolate,
Handle<Object> input) {
DisallowJavascriptExecution no_js(isolate);
if (input->IsString() || input->IsNumber() || input->IsOddball()) {
return Object::ToString(isolate, input).ToHandleChecked();
} else if (input->IsBigInt()) {
MaybeHandle<String> maybe_string =
BigInt::ToString(isolate, Handle<BigInt>::cast(input), 10, kDontThrow);
Handle<String> result;
if (maybe_string.ToHandle(&result)) return result;
// BigInt-to-String conversion can fail on 32-bit platforms where
// String::kMaxLength is too small to fit this BigInt.
return isolate->factory()->NewStringFromStaticChars(
"<a very large BigInt>");
} else if (input->IsFunction()) {
// -- F u n c t i o n
Handle<String> fun_str;
if (input->IsJSBoundFunction()) {
fun_str = JSBoundFunction::ToString(Handle<JSBoundFunction>::cast(input));
} else {
DCHECK(input->IsJSFunction());
fun_str = JSFunction::ToString(Handle<JSFunction>::cast(input));
}
if (fun_str->length() > 128) {
IncrementalStringBuilder builder(isolate);
builder.AppendString(isolate->factory()->NewSubString(fun_str, 0, 111));
builder.AppendCString("...<omitted>...");
builder.AppendString(isolate->factory()->NewSubString(
fun_str, fun_str->length() - 2, fun_str->length()));
return builder.Finish().ToHandleChecked();
}
return fun_str;
} else if (input->IsSymbol()) {
// -- S y m b o l
Handle<Symbol> symbol = Handle<Symbol>::cast(input);
if (symbol->is_private_name()) {
return Handle<String>(String::cast(symbol->description()), isolate);
}
IncrementalStringBuilder builder(isolate);
builder.AppendCString("Symbol(");
if (symbol->description().IsString()) {
builder.AppendString(
handle(String::cast(symbol->description()), isolate));
}
builder.AppendCharacter(')');
return builder.Finish().ToHandleChecked();
} else if (input->IsJSReceiver()) {
// -- J S R e c e i v e r
Handle<JSReceiver> receiver = Handle<JSReceiver>::cast(input);
Handle<Object> to_string = JSReceiver::GetDataProperty(
receiver, isolate->factory()->toString_string());
if (IsErrorObject(isolate, input) ||
*to_string == *isolate->error_to_string()) {
// When internally formatting error objects, use a side-effects-free
// version of Error.prototype.toString independent of the actually
// installed toString method.
return NoSideEffectsErrorToString(isolate,
Handle<JSReceiver>::cast(input));
} else if (*to_string == *isolate->object_to_string()) {
Handle<Object> ctor = JSReceiver::GetDataProperty(
receiver, isolate->factory()->constructor_string());
if (ctor->IsFunction()) {
Handle<String> ctor_name;
if (ctor->IsJSBoundFunction()) {
ctor_name = JSBoundFunction::GetName(
isolate, Handle<JSBoundFunction>::cast(ctor))
.ToHandleChecked();
} else if (ctor->IsJSFunction()) {
Handle<Object> ctor_name_obj =
JSFunction::GetName(isolate, Handle<JSFunction>::cast(ctor));
ctor_name = AsStringOrEmpty(isolate, ctor_name_obj);
}
if (ctor_name->length() != 0) {
IncrementalStringBuilder builder(isolate);
builder.AppendCString("#<");
builder.AppendString(ctor_name);
builder.AppendCString(">");
return builder.Finish().ToHandleChecked();
}
}
}
}
// At this point, input is either none of the above or a JSReceiver.
Handle<JSReceiver> receiver;
if (input->IsJSReceiver()) {
receiver = Handle<JSReceiver>::cast(input);
} else {
// This is the only case where Object::ToObject throws.
DCHECK(!input->IsSmi());
int constructor_function_index =
Handle<HeapObject>::cast(input)->map().GetConstructorFunctionIndex();
if (constructor_function_index == Map::kNoConstructorFunctionIndex) {
return isolate->factory()->NewStringFromAsciiChecked("[object Unknown]");
}
receiver = Object::ToObjectImpl(isolate, input).ToHandleChecked();
}
Handle<String> builtin_tag = handle(receiver->class_name(), isolate);
Handle<Object> tag_obj = JSReceiver::GetDataProperty(
receiver, isolate->factory()->to_string_tag_symbol());
Handle<String> tag =
tag_obj->IsString() ? Handle<String>::cast(tag_obj) : builtin_tag;
IncrementalStringBuilder builder(isolate);
builder.AppendCString("[object ");
builder.AppendString(tag);
builder.AppendCString("]");
return builder.Finish().ToHandleChecked();
}
// static
MaybeHandle<Object> Object::ConvertToLength(Isolate* isolate,
Handle<Object> input) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, input, ToNumber(isolate, input), Object);
if (input->IsSmi()) {
int value = std::max(Smi::ToInt(*input), 0);
return handle(Smi::FromInt(value), isolate);
}
double len = DoubleToInteger(input->Number());
if (len <= 0.0) {
return handle(Smi::zero(), isolate);
} else if (len >= kMaxSafeInteger) {
len = kMaxSafeInteger;
}
return isolate->factory()->NewNumber(len);
}
// static
MaybeHandle<Object> Object::ConvertToIndex(Isolate* isolate,
Handle<Object> input,
MessageTemplate error_index) {
if (input->IsUndefined(isolate)) return handle(Smi::zero(), isolate);
ASSIGN_RETURN_ON_EXCEPTION(isolate, input, ToNumber(isolate, input), Object);
if (input->IsSmi() && Smi::ToInt(*input) >= 0) return input;
double len = DoubleToInteger(input->Number());
auto js_len = isolate->factory()->NewNumber(len);
if (len < 0.0 || len > kMaxSafeInteger) {
THROW_NEW_ERROR(isolate, NewRangeError(error_index, js_len), Object);
}
return js_len;
}
bool Object::BooleanValue(Isolate* isolate) {
if (IsSmi()) return Smi::ToInt(*this) != 0;
DCHECK(IsHeapObject());
if (IsBoolean()) return IsTrue(isolate);
if (IsNullOrUndefined(isolate)) return false;
if (IsUndetectable()) return false; // Undetectable object is false.
if (IsString()) return String::cast(*this).length() != 0;
if (IsHeapNumber()) return DoubleToBoolean(HeapNumber::cast(*this).value());
if (IsBigInt()) return BigInt::cast(*this).ToBoolean();
return true;
}
Object Object::ToBoolean(Isolate* isolate) {
if (IsBoolean()) return *this;
return isolate->heap()->ToBoolean(BooleanValue(isolate));
}
namespace {
// TODO(bmeurer): Maybe we should introduce a marker interface Number,
// where we put all these methods at some point?
ComparisonResult StrictNumberCompare(double x, double y) {
if (std::isnan(x) || std::isnan(y)) {
return ComparisonResult::kUndefined;
} else if (x < y) {
return ComparisonResult::kLessThan;
} else if (x > y) {
return ComparisonResult::kGreaterThan;
} else {
return ComparisonResult::kEqual;
}
}
// See Number case of ES6#sec-strict-equality-comparison
// Returns false if x or y is NaN, treats -0.0 as equal to 0.0.
bool StrictNumberEquals(double x, double y) {
// Must check explicitly for NaN's on Windows, but -0 works fine.
if (std::isnan(x) || std::isnan(y)) return false;
return x == y;
}
bool StrictNumberEquals(const Object x, const Object y) {
return StrictNumberEquals(x.Number(), y.Number());
}
bool StrictNumberEquals(Handle<Object> x, Handle<Object> y) {
return StrictNumberEquals(*x, *y);
}
ComparisonResult Reverse(ComparisonResult result) {
if (result == ComparisonResult::kLessThan) {
return ComparisonResult::kGreaterThan;
}
if (result == ComparisonResult::kGreaterThan) {
return ComparisonResult::kLessThan;
}
return result;
}
} // anonymous namespace
// static
Maybe<ComparisonResult> Object::Compare(Isolate* isolate, Handle<Object> x,
Handle<Object> y) {
// ES6 section 7.2.11 Abstract Relational Comparison step 3 and 4.
if (!Object::ToPrimitive(x, ToPrimitiveHint::kNumber).ToHandle(&x) ||
!Object::ToPrimitive(y, ToPrimitiveHint::kNumber).ToHandle(&y)) {
return Nothing<ComparisonResult>();
}
if (x->IsString() && y->IsString()) {
// ES6 section 7.2.11 Abstract Relational Comparison step 5.
return Just(String::Compare(isolate, Handle<String>::cast(x),
Handle<String>::cast(y)));
}
if (x->IsBigInt() && y->IsString()) {
return BigInt::CompareToString(isolate, Handle<BigInt>::cast(x),
Handle<String>::cast(y));
}
if (x->IsString() && y->IsBigInt()) {
Maybe<ComparisonResult> maybe_result = BigInt::CompareToString(
isolate, Handle<BigInt>::cast(y), Handle<String>::cast(x));
ComparisonResult result;
if (maybe_result.To(&result)) {
return Just(Reverse(result));
} else {
return Nothing<ComparisonResult>();
}
}
// ES6 section 7.2.11 Abstract Relational Comparison step 6.
if (!Object::ToNumeric(isolate, x).ToHandle(&x) ||
!Object::ToNumeric(isolate, y).ToHandle(&y)) {
return Nothing<ComparisonResult>();
}
bool x_is_number = x->IsNumber();
bool y_is_number = y->IsNumber();
if (x_is_number && y_is_number) {
return Just(StrictNumberCompare(x->Number(), y->Number()));
} else if (!x_is_number && !y_is_number) {
return Just(BigInt::CompareToBigInt(Handle<BigInt>::cast(x),
Handle<BigInt>::cast(y)));
} else if (x_is_number) {
return Just(Reverse(BigInt::CompareToNumber(Handle<BigInt>::cast(y), x)));
} else {
return Just(BigInt::CompareToNumber(Handle<BigInt>::cast(x), y));
}
}
// static
Maybe<bool> Object::Equals(Isolate* isolate, Handle<Object> x,
Handle<Object> y) {
// This is the generic version of Abstract Equality Comparison. Must be in
// sync with CodeStubAssembler::Equal.
while (true) {
if (x->IsNumber()) {
if (y->IsNumber()) {
return Just(StrictNumberEquals(x, y));
} else if (y->IsBoolean()) {
return Just(
StrictNumberEquals(*x, Handle<Oddball>::cast(y)->to_number()));
} else if (y->IsString()) {
return Just(StrictNumberEquals(
x, String::ToNumber(isolate, Handle<String>::cast(y))));
} else if (y->IsBigInt()) {
return Just(BigInt::EqualToNumber(Handle<BigInt>::cast(y), x));
} else if (y->IsJSReceiver()) {
if (!JSReceiver::ToPrimitive(Handle<JSReceiver>::cast(y))
.ToHandle(&y)) {
return Nothing<bool>();
}
} else {
return Just(false);
}
} else if (x->IsString()) {
if (y->IsString()) {
return Just(String::Equals(isolate, Handle<String>::cast(x),
Handle<String>::cast(y)));
} else if (y->IsNumber()) {
x = String::ToNumber(isolate, Handle<String>::cast(x));
return Just(StrictNumberEquals(x, y));
} else if (y->IsBoolean()) {
x = String::ToNumber(isolate, Handle<String>::cast(x));
return Just(
StrictNumberEquals(*x, Handle<Oddball>::cast(y)->to_number()));
} else if (y->IsBigInt()) {
return BigInt::EqualToString(isolate, Handle<BigInt>::cast(y),
Handle<String>::cast(x));
} else if (y->IsJSReceiver()) {
if (!JSReceiver::ToPrimitive(Handle<JSReceiver>::cast(y))
.ToHandle(&y)) {
return Nothing<bool>();
}
} else {
return Just(false);
}
} else if (x->IsBoolean()) {
if (y->IsOddball()) {
return Just(x.is_identical_to(y));
} else if (y->IsNumber()) {
return Just(
StrictNumberEquals(Handle<Oddball>::cast(x)->to_number(), *y));
} else if (y->IsString()) {
y = String::ToNumber(isolate, Handle<String>::cast(y));
return Just(
StrictNumberEquals(Handle<Oddball>::cast(x)->to_number(), *y));
} else if (y->IsBigInt()) {
x = Oddball::ToNumber(isolate, Handle<Oddball>::cast(x));
return Just(BigInt::EqualToNumber(Handle<BigInt>::cast(y), x));
} else if (y->IsJSReceiver()) {
if (!JSReceiver::ToPrimitive(Handle<JSReceiver>::cast(y))
.ToHandle(&y)) {
return Nothing<bool>();
}
x = Oddball::ToNumber(isolate, Handle<Oddball>::cast(x));
} else {
return Just(false);
}
} else if (x->IsSymbol()) {
if (y->IsSymbol()) {
return Just(x.is_identical_to(y));
} else if (y->IsJSReceiver()) {
if (!JSReceiver::ToPrimitive(Handle<JSReceiver>::cast(y))
.ToHandle(&y)) {
return Nothing<bool>();
}
} else {
return Just(false);
}
} else if (x->IsBigInt()) {
if (y->IsBigInt()) {
return Just(BigInt::EqualToBigInt(BigInt::cast(*x), BigInt::cast(*y)));
}
return Equals(isolate, y, x);
} else if (x->IsJSReceiver()) {
if (y->IsJSReceiver()) {
return Just(x.is_identical_to(y));
} else if (y->IsUndetectable()) {
return Just(x->IsUndetectable());
} else if (y->IsBoolean()) {
y = Oddball::ToNumber(isolate, Handle<Oddball>::cast(y));
} else if (!JSReceiver::ToPrimitive(Handle<JSReceiver>::cast(x))
.ToHandle(&x)) {
return Nothing<bool>();
}
} else {
return Just(x->IsUndetectable() && y->IsUndetectable());
}
}
}
bool Object::StrictEquals(Object that) {
if (this->IsNumber()) {
if (!that.IsNumber()) return false;
return StrictNumberEquals(*this, that);
} else if (this->IsString()) {
if (!that.IsString()) return false;
return String::cast(*this).Equals(String::cast(that));
} else if (this->IsBigInt()) {
if (!that.IsBigInt()) return false;
return BigInt::EqualToBigInt(BigInt::cast(*this), BigInt::cast(that));
}
return *this == that;
}
// static
Handle<String> Object::TypeOf(Isolate* isolate, Handle<Object> object) {
if (object->IsNumber()) return isolate->factory()->number_string();
if (object->IsOddball())
return handle(Oddball::cast(*object).type_of(), isolate);
if (object->IsUndetectable()) {
return isolate->factory()->undefined_string();
}
if (object->IsString()) return isolate->factory()->string_string();
if (object->IsSymbol()) return isolate->factory()->symbol_string();
if (object->IsBigInt()) return isolate->factory()->bigint_string();
if (object->IsCallable()) return isolate->factory()->function_string();
return isolate->factory()->object_string();
}
// static
MaybeHandle<Object> Object::Add(Isolate* isolate, Handle<Object> lhs,
Handle<Object> rhs) {
if (lhs->IsNumber() && rhs->IsNumber()) {
return isolate->factory()->NewNumber(lhs->Number() + rhs->Number());
} else if (lhs->IsString() && rhs->IsString()) {
return isolate->factory()->NewConsString(Handle<String>::cast(lhs),
Handle<String>::cast(rhs));
}
ASSIGN_RETURN_ON_EXCEPTION(isolate, lhs, Object::ToPrimitive(lhs), Object);
ASSIGN_RETURN_ON_EXCEPTION(isolate, rhs, Object::ToPrimitive(rhs), Object);
if (lhs->IsString() || rhs->IsString()) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, rhs, Object::ToString(isolate, rhs),
Object);
ASSIGN_RETURN_ON_EXCEPTION(isolate, lhs, Object::ToString(isolate, lhs),
Object);
return isolate->factory()->NewConsString(Handle<String>::cast(lhs),
Handle<String>::cast(rhs));
}
ASSIGN_RETURN_ON_EXCEPTION(isolate, rhs, Object::ToNumber(isolate, rhs),
Object);
ASSIGN_RETURN_ON_EXCEPTION(isolate, lhs, Object::ToNumber(isolate, lhs),
Object);
return isolate->factory()->NewNumber(lhs->Number() + rhs->Number());
}
// static
MaybeHandle<Object> Object::OrdinaryHasInstance(Isolate* isolate,
Handle<Object> callable,
Handle<Object> object) {
// The {callable} must have a [[Call]] internal method.
if (!callable->IsCallable()) return isolate->factory()->false_value();
// Check if {callable} is a bound function, and if so retrieve its
// [[BoundTargetFunction]] and use that instead of {callable}.
if (callable->IsJSBoundFunction()) {
Handle<Object> bound_callable(
Handle<JSBoundFunction>::cast(callable)->bound_target_function(),
isolate);
return Object::InstanceOf(isolate, object, bound_callable);
}
// If {object} is not a receiver, return false.
if (!object->IsJSReceiver()) return isolate->factory()->false_value();
// Get the "prototype" of {callable}; raise an error if it's not a receiver.
Handle<Object> prototype;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, prototype,
Object::GetProperty(isolate, callable,
isolate->factory()->prototype_string()),
Object);
if (!prototype->IsJSReceiver()) {
THROW_NEW_ERROR(
isolate,
NewTypeError(MessageTemplate::kInstanceofNonobjectProto, prototype),
Object);
}
// Return whether or not {prototype} is in the prototype chain of {object}.
Maybe<bool> result = JSReceiver::HasInPrototypeChain(
isolate, Handle<JSReceiver>::cast(object), prototype);
if (result.IsNothing()) return MaybeHandle<Object>();
return isolate->factory()->ToBoolean(result.FromJust());
}
// static
MaybeHandle<Object> Object::InstanceOf(Isolate* isolate, Handle<Object> object,
Handle<Object> callable) {
// The {callable} must be a receiver.
if (!callable->IsJSReceiver()) {
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kNonObjectInInstanceOfCheck),
Object);
}
// Lookup the @@hasInstance method on {callable}.
Handle<Object> inst_of_handler;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, inst_of_handler,
Object::GetMethod(Handle<JSReceiver>::cast(callable),
isolate->factory()->has_instance_symbol()),
Object);
if (!inst_of_handler->IsUndefined(isolate)) {
// Call the {inst_of_handler} on the {callable}.
Handle<Object> result;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, result,
Execution::Call(isolate, inst_of_handler, callable, 1, &object),
Object);
return isolate->factory()->ToBoolean(result->BooleanValue(isolate));
}
// The {callable} must have a [[Call]] internal method.
if (!callable->IsCallable()) {
THROW_NEW_ERROR(
isolate, NewTypeError(MessageTemplate::kNonCallableInInstanceOfCheck),
Object);
}
// Fall back to OrdinaryHasInstance with {callable} and {object}.
Handle<Object> result;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, result, Object::OrdinaryHasInstance(isolate, callable, object),
Object);
return result;
}
// static
MaybeHandle<Object> Object::GetMethod(Handle<JSReceiver> receiver,
Handle<Name> name) {
Handle<Object> func;
Isolate* isolate = receiver->GetIsolate();
ASSIGN_RETURN_ON_EXCEPTION(
isolate, func, JSReceiver::GetProperty(isolate, receiver, name), Object);
if (func->IsNullOrUndefined(isolate)) {
return isolate->factory()->undefined_value();
}
if (!func->IsCallable()) {
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kPropertyNotFunction, func,
name, receiver),
Object);
}
return func;
}
namespace {
MaybeHandle<FixedArray> CreateListFromArrayLikeFastPath(
Isolate* isolate, Handle<Object> object, ElementTypes element_types) {
if (element_types == ElementTypes::kAll) {
if (object->IsJSArray()) {
Handle<JSArray> array = Handle<JSArray>::cast(object);
uint32_t length;
if (!array->HasArrayPrototype(isolate) ||
!array->length().ToUint32(&length) || !array->HasFastElements() ||
!JSObject::PrototypeHasNoElements(isolate, *array)) {
return MaybeHandle<FixedArray>();
}
return array->GetElementsAccessor()->CreateListFromArrayLike(
isolate, array, length);
} else if (object->IsJSTypedArray()) {
Handle<JSTypedArray> array = Handle<JSTypedArray>::cast(object);
size_t length = array->length();
if (array->WasDetached() ||
length > static_cast<size_t>(FixedArray::kMaxLength)) {
return MaybeHandle<FixedArray>();
}
STATIC_ASSERT(FixedArray::kMaxLength <=
std::numeric_limits<uint32_t>::max());
return array->GetElementsAccessor()->CreateListFromArrayLike(
isolate, array, static_cast<uint32_t>(length));
}
}
return MaybeHandle<FixedArray>();
}
} // namespace
// static
MaybeHandle<FixedArray> Object::CreateListFromArrayLike(
Isolate* isolate, Handle<Object> object, ElementTypes element_types) {
// Fast-path for JSArray and JSTypedArray.
MaybeHandle<FixedArray> fast_result =
CreateListFromArrayLikeFastPath(isolate, object, element_types);
if (!fast_result.is_null()) return fast_result;
// 1. ReturnIfAbrupt(object).
// 2. (default elementTypes -- not applicable.)
// 3. If Type(obj) is not Object, throw a TypeError exception.
if (!object->IsJSReceiver()) {
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kCalledOnNonObject,
isolate->factory()->NewStringFromAsciiChecked(
"CreateListFromArrayLike")),
FixedArray);
}
// 4. Let len be ? ToLength(? Get(obj, "length")).
Handle<JSReceiver> receiver = Handle<JSReceiver>::cast(object);
Handle<Object> raw_length_number;
ASSIGN_RETURN_ON_EXCEPTION(isolate, raw_length_number,
Object::GetLengthFromArrayLike(isolate, receiver),
FixedArray);
uint32_t len;
if (!raw_length_number->ToUint32(&len) ||
len > static_cast<uint32_t>(FixedArray::kMaxLength)) {
THROW_NEW_ERROR(isolate,
NewRangeError(MessageTemplate::kInvalidArrayLength),
FixedArray);
}
// 5. Let list be an empty List.
Handle<FixedArray> list = isolate->factory()->NewFixedArray(len);
// 6. Let index be 0.
// 7. Repeat while index < len:
for (uint32_t index = 0; index < len; ++index) {
// 7a. Let indexName be ToString(index).
// 7b. Let next be ? Get(obj, indexName).
Handle<Object> next;
ASSIGN_RETURN_ON_EXCEPTION(isolate, next,
JSReceiver::GetElement(isolate, receiver, index),
FixedArray);
switch (element_types) {
case ElementTypes::kAll:
// Nothing to do.
break;
case ElementTypes::kStringAndSymbol: {
// 7c. If Type(next) is not an element of elementTypes, throw a
// TypeError exception.
if (!next->IsName()) {
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kNotPropertyName, next),
FixedArray);
}
// 7d. Append next as the last element of list.
// Internalize on the fly so we can use pointer identity later.
next = isolate->factory()->InternalizeName(Handle<Name>::cast(next));
break;
}
}
list->set(index, *next);
// 7e. Set index to index + 1. (See loop header.)
}
// 8. Return list.
return list;
}
// static
MaybeHandle<Object> Object::GetLengthFromArrayLike(Isolate* isolate,
Handle<JSReceiver> object) {
Handle<Object> val;
Handle<Name> key = isolate->factory()->length_string();
ASSIGN_RETURN_ON_EXCEPTION(
isolate, val, JSReceiver::GetProperty(isolate, object, key), Object);
return Object::ToLength(isolate, val);
}
// static
MaybeHandle<Object> Object::GetProperty(LookupIterator* it,
bool is_global_reference) {
for (; it->IsFound(); it->Next()) {
switch (it->state()) {
case LookupIterator::NOT_FOUND:
case LookupIterator::TRANSITION:
UNREACHABLE();
case LookupIterator::JSPROXY: {
bool was_found;
Handle<Object> receiver = it->GetReceiver();
// In case of global IC, the receiver is the global object. Replace by
// the global proxy.
if (receiver->IsJSGlobalObject()) {
receiver = handle(JSGlobalObject::cast(*receiver).global_proxy(),
it->isolate());
}
if (is_global_reference) {
Maybe<bool> maybe = JSProxy::HasProperty(
it->isolate(), it->GetHolder<JSProxy>(), it->GetName());
if (maybe.IsNothing()) return MaybeHandle<Object>();
if (!maybe.FromJust()) {
it->NotFound();
return it->isolate()->factory()->undefined_value();
}
}
MaybeHandle<Object> result =
JSProxy::GetProperty(it->isolate(), it->GetHolder<JSProxy>(),
it->GetName(), receiver, &was_found);
if (!was_found && !is_global_reference) it->NotFound();
return result;
}
case LookupIterator::INTERCEPTOR: {
bool done;
Handle<Object> result;
ASSIGN_RETURN_ON_EXCEPTION(
it->isolate(), result,
JSObject::GetPropertyWithInterceptor(it, &done), Object);
if (done) return result;
break;
}
case LookupIterator::ACCESS_CHECK:
if (it->HasAccess()) break;
return JSObject::GetPropertyWithFailedAccessCheck(it);
case LookupIterator::ACCESSOR:
return GetPropertyWithAccessor(it);
case LookupIterator::INTEGER_INDEXED_EXOTIC:
return it->isolate()->factory()->undefined_value();
case LookupIterator::DATA:
return it->GetDataValue();
}
}
return it->isolate()->factory()->undefined_value();
}
// static
MaybeHandle<Object> JSProxy::GetProperty(Isolate* isolate,
Handle<JSProxy> proxy,
Handle<Name> name,
Handle<Object> receiver,
bool* was_found) {
*was_found = true;
DCHECK(!name->IsPrivate());
STACK_CHECK(isolate, MaybeHandle<Object>());
Handle<Name> trap_name = isolate->factory()->get_string();
// 1. Assert: IsPropertyKey(P) is true.
// 2. Let handler be the value of the [[ProxyHandler]] internal slot of O.
Handle<Object> handler(proxy->handler(), isolate);
// 3. If handler is null, throw a TypeError exception.
// 4. Assert: Type(handler) is Object.
if (proxy->IsRevoked()) {
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kProxyRevoked, trap_name),
Object);
}
// 5. Let target be the value of the [[ProxyTarget]] internal slot of O.
Handle<JSReceiver> target(JSReceiver::cast(proxy->target()), isolate);
// 6. Let trap be ? GetMethod(handler, "get").
Handle<Object> trap;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, trap,
Object::GetMethod(Handle<JSReceiver>::cast(handler), trap_name), Object);
// 7. If trap is undefined, then
if (trap->IsUndefined(isolate)) {
// 7.a Return target.[[Get]](P, Receiver).
LookupIterator::Key key(isolate, name);
LookupIterator it(isolate, receiver, key, target);
MaybeHandle<Object> result = Object::GetProperty(&it);
*was_found = it.IsFound();
return result;
}
// 8. Let trapResult be ? Call(trap, handler, «target, P, Receiver»).
Handle<Object> trap_result;
Handle<Object> args[] = {target, name, receiver};
ASSIGN_RETURN_ON_EXCEPTION(
isolate, trap_result,
Execution::Call(isolate, trap, handler, arraysize(args), args), Object);
MaybeHandle<Object> result =
JSProxy::CheckGetSetTrapResult(isolate, name, target, trap_result, kGet);
if (result.is_null()) {
return result;
}
// 11. Return trap_result
return trap_result;
}
// static
MaybeHandle<Object> JSProxy::CheckGetSetTrapResult(Isolate* isolate,
Handle<Name> name,
Handle<JSReceiver> target,
Handle<Object> trap_result,
AccessKind access_kind) {
// 9. Let targetDesc be ? target.[[GetOwnProperty]](P).
PropertyDescriptor target_desc;
Maybe<bool> target_found =
JSReceiver::GetOwnPropertyDescriptor(isolate, target, name, &target_desc);
MAYBE_RETURN_NULL(target_found);
// 10. If targetDesc is not undefined, then
if (target_found.FromJust()) {
// 10.a. If IsDataDescriptor(targetDesc) and targetDesc.[[Configurable]] is
// false and targetDesc.[[Writable]] is false, then
// 10.a.i. If SameValue(trapResult, targetDesc.[[Value]]) is false,
// throw a TypeError exception.
bool inconsistent = PropertyDescriptor::IsDataDescriptor(&target_desc) &&
!target_desc.configurable() &&
!target_desc.writable() &&
!trap_result->SameValue(*target_desc.value());
if (inconsistent) {
if (access_kind == kGet) {
THROW_NEW_ERROR(
isolate,
NewTypeError(MessageTemplate::kProxyGetNonConfigurableData, name,
target_desc.value(), trap_result),
Object);
} else {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxySetFrozenData, name));
return MaybeHandle<Object>();
}
}
// 10.b. If IsAccessorDescriptor(targetDesc) and targetDesc.[[Configurable]]
// is false and targetDesc.[[Get]] is undefined, then
// 10.b.i. If trapResult is not undefined, throw a TypeError exception.
if (access_kind == kGet) {
inconsistent = PropertyDescriptor::IsAccessorDescriptor(&target_desc) &&
!target_desc.configurable() &&
target_desc.get()->IsUndefined(isolate) &&
!trap_result->IsUndefined(isolate);
} else {
inconsistent = PropertyDescriptor::IsAccessorDescriptor(&target_desc) &&
!target_desc.configurable() &&
target_desc.set()->IsUndefined(isolate);
}
if (inconsistent) {
if (access_kind == kGet) {
THROW_NEW_ERROR(
isolate,
NewTypeError(MessageTemplate::kProxyGetNonConfigurableAccessor,
name, trap_result),
Object);
} else {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxySetFrozenAccessor, name));
return MaybeHandle<Object>();
}
}
}
return isolate->factory()->undefined_value();
}
bool Object::ToInt32(int32_t* value) {
if (IsSmi()) {
*value = Smi::ToInt(*this);
return true;
}
if (IsHeapNumber()) {
double num = HeapNumber::cast(*this).value();
// Check range before conversion to avoid undefined behavior.
if (num >= kMinInt && num <= kMaxInt && FastI2D(FastD2I(num)) == num) {
*value = FastD2I(num);
return true;
}
}
return false;
}
Handle<SharedFunctionInfo> FunctionTemplateInfo::GetOrCreateSharedFunctionInfo(
Isolate* isolate, Handle<FunctionTemplateInfo> info,
MaybeHandle<Name> maybe_name) {
Object current_info = info->shared_function_info();
if (current_info.IsSharedFunctionInfo()) {
return handle(SharedFunctionInfo::cast(current_info), isolate);
}
Handle<Name> name;
Handle<String> name_string;
if (maybe_name.ToHandle(&name) && name->IsString()) {
name_string = Handle<String>::cast(name);
} else if (info->class_name().IsString()) {
name_string = handle(String::cast(info->class_name()), isolate);
} else {
name_string = isolate->factory()->empty_string();
}
FunctionKind function_kind;
if (info->remove_prototype()) {
function_kind = kConciseMethod;
} else {
function_kind = kNormalFunction;
}
Handle<SharedFunctionInfo> result =
isolate->factory()->NewSharedFunctionInfoForApiFunction(name_string, info,
function_kind);
result->set_length(info->length());
result->DontAdaptArguments();
DCHECK(result->IsApiFunction());
info->set_shared_function_info(*result);
return result;
}
bool FunctionTemplateInfo::IsTemplateFor(Map map) {
// There is a constraint on the object; check.
if (!map.IsJSObjectMap()) return false;
// Fetch the constructor function of the object.
Object cons_obj = map.GetConstructor();
Object type;
if (cons_obj.IsJSFunction()) {
JSFunction fun = JSFunction::cast(cons_obj);
type = fun.shared().function_data(kAcquireLoad);
} else if (cons_obj.IsFunctionTemplateInfo()) {
type = FunctionTemplateInfo::cast(cons_obj);
} else {
return false;
}
// Iterate through the chain of inheriting function templates to
// see if the required one occurs.
while (type.IsFunctionTemplateInfo()) {
if (type == *this) return true;
type = FunctionTemplateInfo::cast(type).GetParentTemplate();
}
// Didn't find the required type in the inheritance chain.
return false;
}
// static
FunctionTemplateRareData FunctionTemplateInfo::AllocateFunctionTemplateRareData(
Isolate* isolate, Handle<FunctionTemplateInfo> function_template_info) {
DCHECK(function_template_info->rare_data().IsUndefined(isolate));
Handle<Struct> struct_obj = isolate->factory()->NewStruct(
FUNCTION_TEMPLATE_RARE_DATA_TYPE, AllocationType::kOld);
Handle<FunctionTemplateRareData> rare_data =
i::Handle<FunctionTemplateRareData>::cast(struct_obj);
rare_data->set_c_function(Smi(0));
rare_data->set_c_signature(Smi(0));
function_template_info->set_rare_data(*rare_data);
return *rare_data;
}
// static
Handle<TemplateList> TemplateList::New(Isolate* isolate, int size) {
Handle<FixedArray> list =
isolate->factory()->NewFixedArray(kLengthIndex + size);
list->set(kLengthIndex, Smi::zero());
return Handle<TemplateList>::cast(list);
}
// static
Handle<TemplateList> TemplateList::Add(Isolate* isolate,
Handle<TemplateList> list,
Handle<i::Object> value) {
STATIC_ASSERT(kFirstElementIndex == 1);
int index = list->length() + 1;
Handle<i::FixedArray> fixed_array = Handle<FixedArray>::cast(list);
fixed_array = FixedArray::SetAndGrow(isolate, fixed_array, index, value);
fixed_array->set(kLengthIndex, Smi::FromInt(index));
return Handle<TemplateList>::cast(fixed_array);
}
// ES6 9.5.1
// static
MaybeHandle<HeapObject> JSProxy::GetPrototype(Handle<JSProxy> proxy) {
Isolate* isolate = proxy->GetIsolate();
Handle<String> trap_name = isolate->factory()->getPrototypeOf_string();
STACK_CHECK(isolate, MaybeHandle<HeapObject>());
// 1. Let handler be the value of the [[ProxyHandler]] internal slot.
// 2. If handler is null, throw a TypeError exception.
// 3. Assert: Type(handler) is Object.
// 4. Let target be the value of the [[ProxyTarget]] internal slot.
if (proxy->IsRevoked()) {
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kProxyRevoked, trap_name),
HeapObject);
}
Handle<JSReceiver> target(JSReceiver::cast(proxy->target()), isolate);
Handle<JSReceiver> handler(JSReceiver::cast(proxy->handler()), isolate);
// 5. Let trap be ? GetMethod(handler, "getPrototypeOf").
Handle<Object> trap;
ASSIGN_RETURN_ON_EXCEPTION(isolate, trap,
Object::GetMethod(handler, trap_name), HeapObject);
// 6. If trap is undefined, then return target.[[GetPrototypeOf]]().
if (trap->IsUndefined(isolate)) {
return JSReceiver::GetPrototype(isolate, target);
}
// 7. Let handlerProto be ? Call(trap, handler, «target»).
Handle<Object> argv[] = {target};
Handle<Object> handler_proto;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, handler_proto,
Execution::Call(isolate, trap, handler, arraysize(argv), argv),
HeapObject);
// 8. If Type(handlerProto) is neither Object nor Null, throw a TypeError.
if (!(handler_proto->IsJSReceiver() || handler_proto->IsNull(isolate))) {
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kProxyGetPrototypeOfInvalid),
HeapObject);
}
// 9. Let extensibleTarget be ? IsExtensible(target).
Maybe<bool> is_extensible = JSReceiver::IsExtensible(target);
MAYBE_RETURN(is_extensible, MaybeHandle<HeapObject>());
// 10. If extensibleTarget is true, return handlerProto.
if (is_extensible.FromJust()) return Handle<HeapObject>::cast(handler_proto);
// 11. Let targetProto be ? target.[[GetPrototypeOf]]().
Handle<HeapObject> target_proto;
ASSIGN_RETURN_ON_EXCEPTION(isolate, target_proto,
JSReceiver::GetPrototype(isolate, target),
HeapObject);
// 12. If SameValue(handlerProto, targetProto) is false, throw a TypeError.
if (!handler_proto->SameValue(*target_proto)) {
THROW_NEW_ERROR(
isolate,
NewTypeError(MessageTemplate::kProxyGetPrototypeOfNonExtensible),
HeapObject);
}
// 13. Return handlerProto.
return Handle<HeapObject>::cast(handler_proto);
}
MaybeHandle<Object> Object::GetPropertyWithAccessor(LookupIterator* it) {
Isolate* isolate = it->isolate();
Handle<Object> structure = it->GetAccessors();
Handle<Object> receiver = it->GetReceiver();
// In case of global IC, the receiver is the global object. Replace by the
// global proxy.
if (receiver->IsJSGlobalObject()) {
receiver = handle(JSGlobalObject::cast(*receiver).global_proxy(), isolate);
}
// We should never get here to initialize a const with the hole value since a
// const declaration would conflict with the getter.
DCHECK(!structure->IsForeign());
// API style callbacks.
Handle<JSObject> holder = it->GetHolder<JSObject>();
if (structure->IsAccessorInfo()) {
Handle<Name> name = it->GetName();
Handle<AccessorInfo> info = Handle<AccessorInfo>::cast(structure);
if (!info->IsCompatibleReceiver(*receiver)) {
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kIncompatibleMethodReceiver,
name, receiver),
Object);
}
if (!info->has_getter()) return isolate->factory()->undefined_value();
if (info->is_sloppy() && !receiver->IsJSReceiver()) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, receiver,
Object::ConvertReceiver(isolate, receiver),
Object);
}
PropertyCallbackArguments args(isolate, info->data(), *receiver, *holder,
Just(kDontThrow));
Handle<Object> result = args.CallAccessorGetter(info, name);
RETURN_EXCEPTION_IF_SCHEDULED_EXCEPTION(isolate, Object);
if (result.is_null()) return isolate->factory()->undefined_value();
Handle<Object> reboxed_result = handle(*result, isolate);
if (info->replace_on_access() && receiver->IsJSReceiver()) {
RETURN_ON_EXCEPTION(isolate,
Accessors::ReplaceAccessorWithDataProperty(
isolate, receiver, holder, name, result),
Object);
}
return reboxed_result;
}
// AccessorPair with 'cached' private property.
if (it->TryLookupCachedProperty()) {
return Object::GetProperty(it);
}
// Regular accessor.
Handle<Object> getter(AccessorPair::cast(*structure).getter(), isolate);
if (getter->IsFunctionTemplateInfo()) {
SaveAndSwitchContext save(isolate, *holder->GetCreationContext());
return Builtins::InvokeApiFunction(
isolate, false, Handle<FunctionTemplateInfo>::cast(getter), receiver, 0,
nullptr, isolate->factory()->undefined_value());
} else if (getter->IsCallable()) {
// TODO(rossberg): nicer would be to cast to some JSCallable here...
return Object::GetPropertyWithDefinedGetter(
receiver, Handle<JSReceiver>::cast(getter));
}
// Getter is not a function.
return isolate->factory()->undefined_value();
}
// static
Address AccessorInfo::redirect(Address address, AccessorComponent component) {
ApiFunction fun(address);
DCHECK_EQ(ACCESSOR_GETTER, component);
ExternalReference::Type type = ExternalReference::DIRECT_GETTER_CALL;
return ExternalReference::Create(&fun, type).address();
}
Address AccessorInfo::redirected_getter() const {
Address accessor = v8::ToCData<Address>(getter());
if (accessor == kNullAddress) return kNullAddress;
return redirect(accessor, ACCESSOR_GETTER);
}
Address CallHandlerInfo::redirected_callback() const {
Address address = v8::ToCData<Address>(callback());
ApiFunction fun(address);
ExternalReference::Type type = ExternalReference::DIRECT_API_CALL;
return ExternalReference::Create(&fun, type).address();
}
bool AccessorInfo::IsCompatibleReceiverMap(Handle<AccessorInfo> info,
Handle<Map> map) {
if (!info->HasExpectedReceiverType()) return true;
if (!map->IsJSObjectMap()) return false;
return FunctionTemplateInfo::cast(info->expected_receiver_type())
.IsTemplateFor(*map);
}
Maybe<bool> Object::SetPropertyWithAccessor(
LookupIterator* it, Handle<Object> value,
Maybe<ShouldThrow> maybe_should_throw) {
Isolate* isolate = it->isolate();
Handle<Object> structure = it->GetAccessors();
Handle<Object> receiver = it->GetReceiver();
// In case of global IC, the receiver is the global object. Replace by the
// global proxy.
if (receiver->IsJSGlobalObject()) {
receiver = handle(JSGlobalObject::cast(*receiver).global_proxy(), isolate);
}
// We should never get here to initialize a const with the hole value since a
// const declaration would conflict with the setter.
DCHECK(!structure->IsForeign());
// API style callbacks.
Handle<JSObject> holder = it->GetHolder<JSObject>();
if (structure->IsAccessorInfo()) {
Handle<Name> name = it->GetName();
Handle<AccessorInfo> info = Handle<AccessorInfo>::cast(structure);
if (!info->IsCompatibleReceiver(*receiver)) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kIncompatibleMethodReceiver, name, receiver));
return Nothing<bool>();
}
if (!info->has_setter()) {
// TODO(verwaest): We should not get here anymore once all AccessorInfos
// are marked as special_data_property. They cannot both be writable and
// not have a setter.
return Just(true);
}
if (info->is_sloppy() && !receiver->IsJSReceiver()) {
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, receiver, Object::ConvertReceiver(isolate, receiver),
Nothing<bool>());
}
// The actual type of setter callback is either
// v8::AccessorNameSetterCallback or
// i::Accesors::AccessorNameBooleanSetterCallback, depending on whether the
// AccessorInfo was created by the API or internally (see accessors.cc).
// Here we handle both cases using GenericNamedPropertySetterCallback and
// its Call method.
PropertyCallbackArguments args(isolate, info->data(), *receiver, *holder,
maybe_should_throw);
Handle<Object> result = args.CallAccessorSetter(info, name, value);
// In the case of AccessorNameSetterCallback, we know that the result value
// cannot have been set, so the result of Call will be null. In the case of
// AccessorNameBooleanSetterCallback, the result will either be null
// (signalling an exception) or a boolean Oddball.
RETURN_VALUE_IF_SCHEDULED_EXCEPTION(isolate, Nothing<bool>());
if (result.is_null()) return Just(true);
DCHECK(result->BooleanValue(isolate) ||
GetShouldThrow(isolate, maybe_should_throw) == kDontThrow);
return Just(result->BooleanValue(isolate));
}
// Regular accessor.
Handle<Object> setter(AccessorPair::cast(*structure).setter(), isolate);
if (setter->IsFunctionTemplateInfo()) {
SaveAndSwitchContext save(isolate, *holder->GetCreationContext());
Handle<Object> argv[] = {value};
RETURN_ON_EXCEPTION_VALUE(
isolate,
Builtins::InvokeApiFunction(isolate, false,
Handle<FunctionTemplateInfo>::cast(setter),
receiver, arraysize(argv), argv,
isolate->factory()->undefined_value()),
Nothing<bool>());
return Just(true);
} else if (setter->IsCallable()) {
// TODO(rossberg): nicer would be to cast to some JSCallable here...
return SetPropertyWithDefinedSetter(
receiver, Handle<JSReceiver>::cast(setter), value, maybe_should_throw);
}
RETURN_FAILURE(isolate, GetShouldThrow(isolate, maybe_should_throw),
NewTypeError(MessageTemplate::kNoSetterInCallback,
it->GetName(), it->GetHolder<JSObject>()));
}
MaybeHandle<Object> Object::GetPropertyWithDefinedGetter(
Handle<Object> receiver, Handle<JSReceiver> getter) {
Isolate* isolate = getter->GetIsolate();
// Platforms with simulators like arm/arm64 expose a funny issue. If the
// simulator has a separate JS stack pointer from the C++ stack pointer, it
// can miss C++ stack overflows in the stack guard at the start of JavaScript
// functions. It would be very expensive to check the C++ stack pointer at
// that location. The best solution seems to be to break the impasse by
// adding checks at possible recursion points. What's more, we don't put
// this stack check behind the USE_SIMULATOR define in order to keep
// behavior the same between hardware and simulators.
StackLimitCheck check(isolate);
if (check.JsHasOverflowed()) {
isolate->StackOverflow();
return MaybeHandle<Object>();
}
return Execution::Call(isolate, getter, receiver, 0, nullptr);
}
Maybe<bool> Object::SetPropertyWithDefinedSetter(
Handle<Object> receiver, Handle<JSReceiver> setter, Handle<Object> value,
Maybe<ShouldThrow> should_throw) {
Isolate* isolate = setter->GetIsolate();
Handle<Object> argv[] = {value};
RETURN_ON_EXCEPTION_VALUE(
isolate,
Execution::Call(isolate, setter, receiver, arraysize(argv), argv),
Nothing<bool>());
return Just(true);
}
Map Object::GetPrototypeChainRootMap(Isolate* isolate) const {
DisallowHeapAllocation no_alloc;
if (IsSmi()) {
Context native_context = isolate->context().native_context();
return native_context.number_function().initial_map();
}
const HeapObject heap_object = HeapObject::cast(*this);
return heap_object.map().GetPrototypeChainRootMap(isolate);
}
Smi Object::GetOrCreateHash(Isolate* isolate) {
DisallowHeapAllocation no_gc;
Object hash = Object::GetSimpleHash(*this);
if (hash.IsSmi()) return Smi::cast(hash);
DCHECK(IsJSReceiver());
return JSReceiver::cast(*this).GetOrCreateIdentityHash(isolate);
}
bool Object::SameValue(Object other) {
if (other == *this) return true;
if (IsNumber() && other.IsNumber()) {
return SameNumberValue(Number(), other.Number());
}
if (IsString() && other.IsString()) {
return String::cast(*this).Equals(String::cast(other));
}
if (IsBigInt() && other.IsBigInt()) {
return BigInt::EqualToBigInt(BigInt::cast(*this), BigInt::cast(other));
}
return false;
}
bool Object::SameValueZero(Object other) {
if (other == *this) return true;
if (IsNumber() && other.IsNumber()) {
double this_value = Number();
double other_value = other.Number();
// +0 == -0 is true
return this_value == other_value ||
(std::isnan(this_value) && std::isnan(other_value));
}
if (IsString() && other.IsString()) {
return String::cast(*this).Equals(String::cast(other));
}
if (IsBigInt() && other.IsBigInt()) {
return BigInt::EqualToBigInt(BigInt::cast(*this), BigInt::cast(other));
}
return false;
}
MaybeHandle<Object> Object::ArraySpeciesConstructor(
Isolate* isolate, Handle<Object> original_array) {
Handle<Object> default_species = isolate->array_function();
if (original_array->IsJSArray() &&
Handle<JSArray>::cast(original_array)->HasArrayPrototype(isolate) &&
Protectors::IsArraySpeciesLookupChainIntact(isolate)) {
return default_species;
}
Handle<Object> constructor = isolate->factory()->undefined_value();
Maybe<bool> is_array = Object::IsArray(original_array);
MAYBE_RETURN_NULL(is_array);
if (is_array.FromJust()) {
ASSIGN_RETURN_ON_EXCEPTION(
isolate, constructor,
Object::GetProperty(isolate, original_array,
isolate->factory()->constructor_string()),
Object);
if (constructor->IsConstructor()) {
Handle<Context> constructor_context;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, constructor_context,
JSReceiver::GetFunctionRealm(Handle<JSReceiver>::cast(constructor)),
Object);
if (*constructor_context != *isolate->native_context() &&
*constructor == constructor_context->array_function()) {
constructor = isolate->factory()->undefined_value();
}
}
if (constructor->IsJSReceiver()) {
ASSIGN_RETURN_ON_EXCEPTION(
isolate, constructor,
JSReceiver::GetProperty(isolate,
Handle<JSReceiver>::cast(constructor),
isolate->factory()->species_symbol()),
Object);
if (constructor->IsNull(isolate)) {
constructor = isolate->factory()->undefined_value();
}
}
}
if (constructor->IsUndefined(isolate)) {
return default_species;
} else {
if (!constructor->IsConstructor()) {
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kSpeciesNotConstructor),
Object);
}
return constructor;
}
}
// ES6 section 7.3.20 SpeciesConstructor ( O, defaultConstructor )
V8_WARN_UNUSED_RESULT MaybeHandle<Object> Object::SpeciesConstructor(
Isolate* isolate, Handle<JSReceiver> recv,
Handle<JSFunction> default_ctor) {
Handle<Object> ctor_obj;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, ctor_obj,
JSObject::GetProperty(isolate, recv,
isolate->factory()->constructor_string()),
Object);
if (ctor_obj->IsUndefined(isolate)) return default_ctor;
if (!ctor_obj->IsJSReceiver()) {
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kConstructorNotReceiver),
Object);
}
Handle<JSReceiver> ctor = Handle<JSReceiver>::cast(ctor_obj);
Handle<Object> species;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, species,
JSObject::GetProperty(isolate, ctor,
isolate->factory()->species_symbol()),
Object);
if (species->IsNullOrUndefined(isolate)) {
return default_ctor;
}
if (species->IsConstructor()) return species;
THROW_NEW_ERROR(
isolate, NewTypeError(MessageTemplate::kSpeciesNotConstructor), Object);
}
bool Object::IterationHasObservableEffects() {
// Check that this object is an array.
if (!IsJSArray()) return true;
JSArray array = JSArray::cast(*this);
Isolate* isolate = array.GetIsolate();
#ifdef V8_ENABLE_FORCE_SLOW_PATH
if (isolate->force_slow_path()) return true;
#endif
// Check that we have the original ArrayPrototype.
if (!array.map().prototype().IsJSObject()) return true;
JSObject array_proto = JSObject::cast(array.map().prototype());
if (!isolate->is_initial_array_prototype(array_proto)) return true;
// Check that the ArrayPrototype hasn't been modified in a way that would
// affect iteration.
if (!Protectors::IsArrayIteratorLookupChainIntact(isolate)) return true;
// For FastPacked kinds, iteration will have the same effect as simply
// accessing each property in order.
ElementsKind array_kind = array.GetElementsKind();
if (IsFastPackedElementsKind(array_kind)) return false;
// For FastHoley kinds, an element access on a hole would cause a lookup on
// the prototype. This could have different results if the prototype has been
// changed.
if (IsHoleyElementsKind(array_kind) &&
Protectors::IsNoElementsIntact(isolate)) {
return false;
}
return true;
}
bool Object::IsCodeLike(Isolate* isolate) const {
DisallowGarbageCollection no_gc;
return IsJSReceiver() && JSReceiver::cast(*this).IsCodeLike(isolate);
}
void Object::ShortPrint(FILE* out) const {
OFStream os(out);
os << Brief(*this);
}
void Object::ShortPrint(StringStream* accumulator) const {
std::ostringstream os;
os << Brief(*this);
accumulator->Add(os.str().c_str());
}
void Object::ShortPrint(std::ostream& os) const { os << Brief(*this); }
std::ostream& operator<<(std::ostream& os, const Object& obj) {
obj.ShortPrint(os);
return os;
}
std::ostream& operator<<(std::ostream& os, const Brief& v) {
MaybeObject maybe_object(v.value);
Smi smi;
HeapObject heap_object;
if (maybe_object->ToSmi(&smi)) {
smi.SmiPrint(os);
} else if (maybe_object->IsCleared()) {
os << "[cleared]";
} else if (maybe_object->GetHeapObjectIfWeak(&heap_object)) {
os << "[weak] ";
heap_object.HeapObjectShortPrint(os);
} else if (maybe_object->GetHeapObjectIfStrong(&heap_object)) {
heap_object.HeapObjectShortPrint(os);
} else {
UNREACHABLE();
}
return os;
}
void Smi::SmiPrint(std::ostream& os) const { // NOLINT
os << value();
}
void HeapObject::HeapObjectShortPrint(std::ostream& os) { // NOLINT
os << AsHex::Address(this->ptr()) << " ";
if (IsString()) {
HeapStringAllocator allocator;
StringStream accumulator(&allocator);
String::cast(*this).StringShortPrint(&accumulator);
os << accumulator.ToCString().get();
return;
}
if (IsJSObject()) {
HeapStringAllocator allocator;
StringStream accumulator(&allocator);
JSObject::cast(*this).JSObjectShortPrint(&accumulator);
os << accumulator.ToCString().get();
return;
}
switch (map().instance_type()) {
case MAP_TYPE: {
os << "<Map";
Map mapInstance = Map::cast(*this);
if (mapInstance.IsJSObjectMap()) {
os << "(" << ElementsKindToString(mapInstance.elements_kind()) << ")";
} else if (mapInstance.instance_size() != kVariableSizeSentinel) {
os << "[" << mapInstance.instance_size() << "]";
}
os << ">";
} break;
case AWAIT_CONTEXT_TYPE: {
os << "<AwaitContext generator= ";
HeapStringAllocator allocator;
StringStream accumulator(&allocator);
Context::cast(*this).extension().ShortPrint(&accumulator);
os << accumulator.ToCString().get();
os << '>';
break;
}
case BLOCK_CONTEXT_TYPE:
os << "<BlockContext[" << Context::cast(*this).length() << "]>";
break;
case CATCH_CONTEXT_TYPE:
os << "<CatchContext[" << Context::cast(*this).length() << "]>";
break;
case DEBUG_EVALUATE_CONTEXT_TYPE:
os << "<DebugEvaluateContext[" << Context::cast(*this).length() << "]>";
break;
case EVAL_CONTEXT_TYPE:
os << "<EvalContext[" << Context::cast(*this).length() << "]>";
break;
case FUNCTION_CONTEXT_TYPE:
os << "<FunctionContext[" << Context::cast(*this).length() << "]>";
break;
case MODULE_CONTEXT_TYPE:
os << "<ModuleContext[" << Context::cast(*this).length() << "]>";
break;
case NATIVE_CONTEXT_TYPE:
os << "<NativeContext[" << Context::cast(*this).length() << "]>";
break;
case SCRIPT_CONTEXT_TYPE:
os << "<ScriptContext[" << Context::cast(*this).length() << "]>";
break;
case WITH_CONTEXT_TYPE:
os << "<WithContext[" << Context::cast(*this).length() << "]>";
break;
case SCRIPT_CONTEXT_TABLE_TYPE:
os << "<ScriptContextTable[" << FixedArray::cast(*this).length() << "]>";
break;
case HASH_TABLE_TYPE:
os << "<HashTable[" << FixedArray::cast(*this).length() << "]>";
break;
case ORDERED_HASH_MAP_TYPE:
os << "<OrderedHashMap[" << FixedArray::cast(*this).length() << "]>";
break;
case ORDERED_HASH_SET_TYPE:
os << "<OrderedHashSet[" << FixedArray::cast(*this).length() << "]>";
break;
case ORDERED_NAME_DICTIONARY_TYPE:
os << "<OrderedNameDictionary[" << FixedArray::cast(*this).length()
<< "]>";
break;
case NAME_DICTIONARY_TYPE:
os << "<NameDictionary[" << FixedArray::cast(*this).length() << "]>";
break;
case GLOBAL_DICTIONARY_TYPE:
os << "<GlobalDictionary[" << FixedArray::cast(*this).length() << "]>";
break;
case NUMBER_DICTIONARY_TYPE:
os << "<NumberDictionary[" << FixedArray::cast(*this).length() << "]>";
break;
case SIMPLE_NUMBER_DICTIONARY_TYPE:
os << "<SimpleNumberDictionary[" << FixedArray::cast(*this).length()
<< "]>";
break;
case FIXED_ARRAY_TYPE:
os << "<FixedArray[" << FixedArray::cast(*this).length() << "]>";
break;
case OBJECT_BOILERPLATE_DESCRIPTION_TYPE:
os << "<ObjectBoilerplateDescription[" << FixedArray::cast(*this).length()
<< "]>";
break;
case FIXED_DOUBLE_ARRAY_TYPE:
os << "<FixedDoubleArray[" << FixedDoubleArray::cast(*this).length()
<< "]>";
break;
case BYTE_ARRAY_TYPE:
os << "<ByteArray[" << ByteArray::cast(*this).length() << "]>";
break;
case BYTECODE_ARRAY_TYPE:
os << "<BytecodeArray[" << BytecodeArray::cast(*this).length() << "]>";
break;
case DESCRIPTOR_ARRAY_TYPE:
os << "<DescriptorArray["
<< DescriptorArray::cast(*this).number_of_descriptors() << "]>";
break;
case TRANSITION_ARRAY_TYPE:
os << "<TransitionArray[" << TransitionArray::cast(*this).length()
<< "]>";
break;
case PROPERTY_ARRAY_TYPE:
os << "<PropertyArray[" << PropertyArray::cast(*this).length() << "]>";
break;
case FEEDBACK_CELL_TYPE: {
{
ReadOnlyRoots roots = GetReadOnlyRoots();
os << "<FeedbackCell[";
if (map() == roots.no_closures_cell_map()) {
os << "no feedback";
} else if (map() == roots.no_closures_cell_map()) {
os << "no closures";
} else if (map() == roots.one_closure_cell_map()) {
os << "one closure";
} else if (map() == roots.many_closures_cell_map()) {
os << "many closures";
} else {
os << "!!!INVALID MAP!!!";
}
os << "]>";
}
break;
}
case CLOSURE_FEEDBACK_CELL_ARRAY_TYPE:
os << "<ClosureFeedbackCellArray["
<< ClosureFeedbackCellArray::cast(*this).length() << "]>";
break;
case FEEDBACK_VECTOR_TYPE:
os << "<FeedbackVector[" << FeedbackVector::cast(*this).length() << "]>";
break;
case FREE_SPACE_TYPE:
os << "<FreeSpace[" << FreeSpace::cast(*this).size() << "]>";
break;
case PREPARSE_DATA_TYPE: {
PreparseData data = PreparseData::cast(*this);
os << "<PreparseData[data=" << data.data_length()
<< " children=" << data.children_length() << "]>";
break;
}
case UNCOMPILED_DATA_WITHOUT_PREPARSE_DATA_TYPE: {
UncompiledDataWithoutPreparseData data =
UncompiledDataWithoutPreparseData::cast(*this);
os << "<UncompiledDataWithoutPreparseData (" << data.start_position()
<< ", " << data.end_position() << ")]>";
break;
}
case UNCOMPILED_DATA_WITH_PREPARSE_DATA_TYPE: {
UncompiledDataWithPreparseData data =
UncompiledDataWithPreparseData::cast(*this);
os << "<UncompiledDataWithPreparseData (" << data.start_position() << ", "
<< data.end_position() << ") preparsed=" << Brief(data.preparse_data())
<< ">";
break;
}
case SHARED_FUNCTION_INFO_TYPE: {
SharedFunctionInfo shared = SharedFunctionInfo::cast(*this);
std::unique_ptr<char[]> debug_name = shared.DebugName().ToCString();
if (debug_name[0] != 0) {
os << "<SharedFunctionInfo " << debug_name.get() << ">";
} else {
os << "<SharedFunctionInfo>";
}
break;
}
case JS_MESSAGE_OBJECT_TYPE:
os << "<JSMessageObject>";
break;
#define MAKE_STRUCT_CASE(TYPE, Name, name) \
case TYPE: \
os << "<" #Name; \
Name::cast(*this).BriefPrintDetails(os); \
os << ">"; \
break;
STRUCT_LIST(MAKE_STRUCT_CASE)
#undef MAKE_STRUCT_CASE
case ALLOCATION_SITE_TYPE: {
os << "<AllocationSite";
AllocationSite::cast(*this).BriefPrintDetails(os);
os << ">";
break;
}
case SCOPE_INFO_TYPE: {
ScopeInfo scope = ScopeInfo::cast(*this);
os << "<ScopeInfo";
if (scope.length()) os << " " << scope.scope_type() << " ";
os << "[" << scope.length() << "]>";
break;
}
case CODE_TYPE: {
Code code = Code::cast(*this);
os << "<Code " << CodeKindToString(code.kind());
if (code.is_builtin()) {
os << " " << Builtins::name(code.builtin_index());
}
os << ">";
break;
}
case ODDBALL_TYPE: {
if (IsUndefined()) {
os << "<undefined>";
} else if (IsTheHole()) {
os << "<the_hole>";
} else if (IsNull()) {
os << "<null>";
} else if (IsTrue()) {
os << "<true>";
} else if (IsFalse()) {
os << "<false>";
} else {
os << "<Odd Oddball: ";
os << Oddball::cast(*this).to_string().ToCString().get();
os << ">";
}
break;
}
case SYMBOL_TYPE: {
Symbol symbol = Symbol::cast(*this);
symbol.SymbolShortPrint(os);
break;
}
case HEAP_NUMBER_TYPE: {
os << "<HeapNumber ";
HeapNumber::cast(*this).HeapNumberShortPrint(os);
os << ">";
break;
}
case BIGINT_TYPE: {
os << "<BigInt ";
BigInt::cast(*this).BigIntShortPrint(os);
os << ">";
break;
}
case JS_PROXY_TYPE:
os << "<JSProxy>";
break;
case FOREIGN_TYPE:
os << "<Foreign>";
break;
case CELL_TYPE: {
os << "<Cell value= ";
HeapStringAllocator allocator;
StringStream accumulator(&allocator);
Cell::cast(*this).value().ShortPrint(&accumulator);
os << accumulator.ToCString().get();
os << '>';
break;
}
case PROPERTY_CELL_TYPE: {
PropertyCell cell = PropertyCell::cast(*this);
os << "<PropertyCell name=";
cell.name().ShortPrint(os);
os << " value=";
HeapStringAllocator allocator;
StringStream accumulator(&allocator);
cell.value().ShortPrint(&accumulator);
os << accumulator.ToCString().get();
os << '>';
break;
}
case CALL_HANDLER_INFO_TYPE: {
CallHandlerInfo info = CallHandlerInfo::cast(*this);
os << "<CallHandlerInfo ";
os << "callback= " << Brief(info.callback());
os << ", js_callback= " << Brief(info.js_callback());
os << ", data= " << Brief(info.data());
if (info.IsSideEffectFreeCallHandlerInfo()) {
os << ", side_effect_free= true>";
} else {
os << ", side_effect_free= false>";
}
break;
}
default:
os << "<Other heap object (" << map().instance_type() << ")>";
break;
}
}
void Struct::BriefPrintDetails(std::ostream& os) {}
void Tuple2::BriefPrintDetails(std::ostream& os) {
os << " " << Brief(value1()) << ", " << Brief(value2());
}
void ClassPositions::BriefPrintDetails(std::ostream& os) {
os << " " << start() << ", " << end();
}
void ArrayBoilerplateDescription::BriefPrintDetails(std::ostream& os) {
os << " " << ElementsKindToString(elements_kind()) << ", "
<< Brief(constant_elements());
}
void CallableTask::BriefPrintDetails(std::ostream& os) {
os << " callable=" << Brief(callable());
}
void HeapObject::Iterate(ObjectVisitor* v) { IterateFast<ObjectVisitor>(v); }
void HeapObject::IterateBody(ObjectVisitor* v) {
Map m = map();
IterateBodyFast<ObjectVisitor>(m, SizeFromMap(m), v);
}
void HeapObject::IterateBody(Map map, int object_size, ObjectVisitor* v) {
IterateBodyFast<ObjectVisitor>(map, object_size, v);
}
struct CallIsValidSlot {
template <typename BodyDescriptor>
static bool apply(Map map, HeapObject obj, int offset, int) {
return BodyDescriptor::IsValidSlot(map, obj, offset);
}
};
bool HeapObject::IsValidSlot(Map map, int offset) {
DCHECK_NE(0, offset);
return BodyDescriptorApply<CallIsValidSlot, bool>(map.instance_type(), map,
*this, offset, 0);
}
int HeapObject::SizeFromMap(Map map) const {
int instance_size = map.instance_size();
if (instance_size != kVariableSizeSentinel) return instance_size;
// Only inline the most frequent cases.
InstanceType instance_type = map.instance_type();
if (base::IsInRange(instance_type, FIRST_FIXED_ARRAY_TYPE,
LAST_FIXED_ARRAY_TYPE)) {
return FixedArray::SizeFor(
FixedArray::unchecked_cast(*this).synchronized_length());
}
if (base::IsInRange(instance_type, FIRST_CONTEXT_TYPE, LAST_CONTEXT_TYPE)) {
if (instance_type == NATIVE_CONTEXT_TYPE) return NativeContext::kSize;
return Context::SizeFor(Context::unchecked_cast(*this).length());
}
if (instance_type == ONE_BYTE_STRING_TYPE ||
instance_type == ONE_BYTE_INTERNALIZED_STRING_TYPE) {
// Strings may get concurrently truncated, hence we have to access its
// length synchronized.
return SeqOneByteString::SizeFor(
SeqOneByteString::unchecked_cast(*this).synchronized_length());
}
if (instance_type == BYTE_ARRAY_TYPE) {
return ByteArray::SizeFor(
ByteArray::unchecked_cast(*this).synchronized_length());
}
if (instance_type == BYTECODE_ARRAY_TYPE) {
return BytecodeArray::SizeFor(
BytecodeArray::unchecked_cast(*this).synchronized_length());
}
if (instance_type == FREE_SPACE_TYPE) {
return FreeSpace::unchecked_cast(*this).relaxed_read_size();
}
if (instance_type == STRING_TYPE ||
instance_type == INTERNALIZED_STRING_TYPE) {
// Strings may get concurrently truncated, hence we have to access its
// length synchronized.
return SeqTwoByteString::SizeFor(
SeqTwoByteString::unchecked_cast(*this).synchronized_length());
}
if (instance_type == FIXED_DOUBLE_ARRAY_TYPE) {
return FixedDoubleArray::SizeFor(
FixedDoubleArray::unchecked_cast(*this).synchronized_length());
}
if (instance_type == FEEDBACK_METADATA_TYPE) {
return FeedbackMetadata::SizeFor(
FeedbackMetadata::unchecked_cast(*this).synchronized_slot_count());
}
if (base::IsInRange(instance_type, FIRST_DESCRIPTOR_ARRAY_TYPE,
LAST_DESCRIPTOR_ARRAY_TYPE)) {
return DescriptorArray::SizeFor(
DescriptorArray::unchecked_cast(*this).number_of_all_descriptors());
}
if (base::IsInRange(instance_type, FIRST_WEAK_FIXED_ARRAY_TYPE,
LAST_WEAK_FIXED_ARRAY_TYPE)) {
return WeakFixedArray::SizeFor(
WeakFixedArray::unchecked_cast(*this).synchronized_length());
}
if (instance_type == WEAK_ARRAY_LIST_TYPE) {
return WeakArrayList::SizeForCapacity(
WeakArrayList::unchecked_cast(*this).synchronized_capacity());
}
if (instance_type == SMALL_ORDERED_HASH_SET_TYPE) {
return SmallOrderedHashSet::SizeFor(
SmallOrderedHashSet::unchecked_cast(*this).Capacity());
}
if (instance_type == SMALL_ORDERED_HASH_MAP_TYPE) {
return SmallOrderedHashMap::SizeFor(
SmallOrderedHashMap::unchecked_cast(*this).Capacity());
}
if (instance_type == SMALL_ORDERED_NAME_DICTIONARY_TYPE) {
return SmallOrderedNameDictionary::SizeFor(
SmallOrderedNameDictionary::unchecked_cast(*this).Capacity());
}
if (instance_type == PROPERTY_ARRAY_TYPE) {
return PropertyArray::SizeFor(
PropertyArray::cast(*this).synchronized_length());
}
if (instance_type == FEEDBACK_VECTOR_TYPE) {
return FeedbackVector::SizeFor(
FeedbackVector::unchecked_cast(*this).length());
}
if (instance_type == BIGINT_TYPE) {
return BigInt::SizeFor(BigInt::unchecked_cast(*this).length());
}
if (instance_type == PREPARSE_DATA_TYPE) {
PreparseData data = PreparseData::unchecked_cast(*this);
return PreparseData::SizeFor(data.data_length(), data.children_length());
}
#define MAKE_TORQUE_SIZE_FOR(TYPE, TypeName) \
if (instance_type == TYPE) { \
return TypeName::unchecked_cast(*this).AllocatedSize(); \
}
TORQUE_INSTANCE_TYPE_TO_BODY_DESCRIPTOR_LIST(MAKE_TORQUE_SIZE_FOR)
#undef MAKE_TORQUE_SIZE_FOR
if (instance_type == CODE_TYPE) {
return Code::unchecked_cast(*this).CodeSize();
}
if (instance_type == COVERAGE_INFO_TYPE) {
return CoverageInfo::SizeFor(
CoverageInfo::unchecked_cast(*this).slot_count());
}
if (instance_type == WASM_ARRAY_TYPE) {
return WasmArray::SizeFor(map, WasmArray::cast(*this).length());
}
DCHECK_EQ(instance_type, EMBEDDER_DATA_ARRAY_TYPE);
return EmbedderDataArray::SizeFor(
EmbedderDataArray::unchecked_cast(*this).length());
}
bool HeapObject::NeedsRehashing() const {
return NeedsRehashing(map().instance_type());
}
bool HeapObject::NeedsRehashing(InstanceType instance_type) const {
DCHECK_EQ(instance_type, map().instance_type());
switch (instance_type) {
case DESCRIPTOR_ARRAY_TYPE:
case STRONG_DESCRIPTOR_ARRAY_TYPE:
return DescriptorArray::cast(*this).number_of_descriptors() > 1;
case TRANSITION_ARRAY_TYPE:
return TransitionArray::cast(*this).number_of_entries() > 1;
case ORDERED_HASH_MAP_TYPE:
case ORDERED_HASH_SET_TYPE:
return false; // We'll rehash from the JSMap or JSSet referencing them.
case NAME_DICTIONARY_TYPE:
case GLOBAL_DICTIONARY_TYPE:
case NUMBER_DICTIONARY_TYPE:
case SIMPLE_NUMBER_DICTIONARY_TYPE:
case HASH_TABLE_TYPE:
case SMALL_ORDERED_HASH_MAP_TYPE:
case SMALL_ORDERED_HASH_SET_TYPE:
case SMALL_ORDERED_NAME_DICTIONARY_TYPE:
case JS_MAP_TYPE:
case JS_SET_TYPE:
return true;
default:
return false;
}
}
bool HeapObject::CanBeRehashed() const {
DCHECK(NeedsRehashing());
switch (map().instance_type()) {
case JS_MAP_TYPE:
case JS_SET_TYPE:
return true;
case ORDERED_HASH_MAP_TYPE:
case ORDERED_HASH_SET_TYPE:
UNREACHABLE(); // We'll rehash from the JSMap or JSSet referencing them.
case ORDERED_NAME_DICTIONARY_TYPE:
return false;
case NAME_DICTIONARY_TYPE:
case GLOBAL_DICTIONARY_TYPE:
case NUMBER_DICTIONARY_TYPE:
case SIMPLE_NUMBER_DICTIONARY_TYPE:
return true;
case DESCRIPTOR_ARRAY_TYPE:
case STRONG_DESCRIPTOR_ARRAY_TYPE:
return true;
case TRANSITION_ARRAY_TYPE:
return true;
case SMALL_ORDERED_HASH_MAP_TYPE:
return SmallOrderedHashMap::cast(*this).NumberOfElements() == 0;
case SMALL_ORDERED_HASH_SET_TYPE:
return SmallOrderedHashMap::cast(*this).NumberOfElements() == 0;
case SMALL_ORDERED_NAME_DICTIONARY_TYPE:
return SmallOrderedNameDictionary::cast(*this).NumberOfElements() == 0;
default:
return false;
}
return false;
}
void HeapObject::RehashBasedOnMap(Isolate* isolate) {
switch (map().instance_type()) {
case HASH_TABLE_TYPE:
UNREACHABLE();
case NAME_DICTIONARY_TYPE:
NameDictionary::cast(*this).Rehash(isolate);
break;
case GLOBAL_DICTIONARY_TYPE:
GlobalDictionary::cast(*this).Rehash(isolate);
break;
case NUMBER_DICTIONARY_TYPE:
NumberDictionary::cast(*this).Rehash(isolate);
break;
case SIMPLE_NUMBER_DICTIONARY_TYPE:
SimpleNumberDictionary::cast(*this).Rehash(isolate);
break;
case DESCRIPTOR_ARRAY_TYPE:
DCHECK_LE(1, DescriptorArray::cast(*this).number_of_descriptors());
DescriptorArray::cast(*this).Sort();
break;
case TRANSITION_ARRAY_TYPE:
TransitionArray::cast(*this).Sort();
break;
case SMALL_ORDERED_HASH_MAP_TYPE:
DCHECK_EQ(0, SmallOrderedHashMap::cast(*this).NumberOfElements());
break;
case SMALL_ORDERED_HASH_SET_TYPE:
DCHECK_EQ(0, SmallOrderedHashSet::cast(*this).NumberOfElements());
break;
case ORDERED_HASH_MAP_TYPE:
case ORDERED_HASH_SET_TYPE:
UNREACHABLE(); // We'll rehash from the JSMap or JSSet referencing them.
case JS_MAP_TYPE: {
JSMap::cast(*this).Rehash(isolate);
break;
}
case JS_SET_TYPE: {
JSSet::cast(*this).Rehash(isolate);
break;
}
case SMALL_ORDERED_NAME_DICTIONARY_TYPE:
DCHECK_EQ(0, SmallOrderedNameDictionary::cast(*this).NumberOfElements());
break;
case ONE_BYTE_INTERNALIZED_STRING_TYPE:
case INTERNALIZED_STRING_TYPE:
// Rare case, rehash read-only space strings before they are sealed.
DCHECK(ReadOnlyHeap::Contains(*this));
String::cast(*this).Hash();
break;
default:
UNREACHABLE();
}
}
bool HeapObject::IsExternal(Isolate* isolate) const {
return map().FindRootMap(isolate) == isolate->heap()->external_map();
}
void DescriptorArray::GeneralizeAllFields() {
int length = number_of_descriptors();
for (InternalIndex i : InternalIndex::Range(length)) {
PropertyDetails details = GetDetails(i);
details = details.CopyWithRepresentation(Representation::Tagged());
if (details.location() == kField) {
DCHECK_EQ(kData, details.kind());
details = details.CopyWithConstness(PropertyConstness::kMutable);
SetValue(i, MaybeObject::FromObject(FieldType::Any()));
}
SetDetails(i, details);
}
}
MaybeHandle<Object> Object::SetProperty(Isolate* isolate, Handle<Object> object,
Handle<Name> name, Handle<Object> value,
StoreOrigin store_origin,
Maybe<ShouldThrow> should_throw) {
LookupIterator it(isolate, object, name);
MAYBE_RETURN_NULL(SetProperty(&it, value, store_origin, should_throw));
return value;
}
Maybe<bool> Object::SetPropertyInternal(LookupIterator* it,
Handle<Object> value,
Maybe<ShouldThrow> should_throw,
StoreOrigin store_origin, bool* found) {
it->UpdateProtector();
DCHECK(it->IsFound());
// Make sure that the top context does not change when doing callbacks or
// interceptor calls.
AssertNoContextChange ncc(it->isolate());
do {
switch (it->state()) {
case LookupIterator::NOT_FOUND:
UNREACHABLE();
case LookupIterator::ACCESS_CHECK:
if (it->HasAccess()) break;
// Check whether it makes sense to reuse the lookup iterator. Here it
// might still call into setters up the prototype chain.
return JSObject::SetPropertyWithFailedAccessCheck(it, value,
should_throw);
case LookupIterator::JSPROXY: {
Handle<Object> receiver = it->GetReceiver();
// In case of global IC, the receiver is the global object. Replace by
// the global proxy.
if (receiver->IsJSGlobalObject()) {
receiver = handle(JSGlobalObject::cast(*receiver).global_proxy(),
it->isolate());
}
return JSProxy::SetProperty(it->GetHolder<JSProxy>(), it->GetName(),
value, receiver, should_throw);
}
case LookupIterator::INTERCEPTOR: {
if (it->HolderIsReceiverOrHiddenPrototype()) {
Maybe<bool> result =
JSObject::SetPropertyWithInterceptor(it, should_throw, value);
if (result.IsNothing() || result.FromJust()) return result;
} else {
Maybe<PropertyAttributes> maybe_attributes =
JSObject::GetPropertyAttributesWithInterceptor(it);
if (maybe_attributes.IsNothing()) return Nothing<bool>();
if ((maybe_attributes.FromJust() & READ_ONLY) != 0) {
return WriteToReadOnlyProperty(it, value, should_throw);
}
if (maybe_attributes.FromJust() == ABSENT) break;
*found = false;
return Nothing<bool>();
}
break;
}
case LookupIterator::ACCESSOR: {
if (it->IsReadOnly()) {
return WriteToReadOnlyProperty(it, value, should_throw);
}
Handle<Object> accessors = it->GetAccessors();
if (accessors->IsAccessorInfo() &&
!it->HolderIsReceiverOrHiddenPrototype() &&
AccessorInfo::cast(*accessors).is_special_data_property()) {
*found = false;
return Nothing<bool>();
}
return SetPropertyWithAccessor(it, value, should_throw);
}
case LookupIterator::INTEGER_INDEXED_EXOTIC: {
// IntegerIndexedElementSet converts value to a Number/BigInt prior to
// the bounds check. The bounds check has already happened here, but
// perform the possibly effectful ToNumber (or ToBigInt) operation
// anyways.
auto holder = it->GetHolder<JSTypedArray>();
Handle<Object> throwaway_value;
if (holder->type() == kExternalBigInt64Array ||
holder->type() == kExternalBigUint64Array) {
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
it->isolate(), throwaway_value,
BigInt::FromObject(it->isolate(), value), Nothing<bool>());
} else {
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
it->isolate(), throwaway_value,
Object::ToNumber(it->isolate(), value), Nothing<bool>());
}
// FIXME: Throw a TypeError if the holder is detached here
// (IntegerIndexedElementSpec step 5).
// TODO(verwaest): Per spec, we should return false here (steps 6-9
// in IntegerIndexedElementSpec), resulting in an exception being thrown
// on OOB accesses in strict code. Historically, v8 has not done made
// this change due to uncertainty about web compat. (v8:4901)
return Just(true);
}
case LookupIterator::DATA:
if (it->IsReadOnly()) {
return WriteToReadOnlyProperty(it, value, should_throw);
}
if (it->HolderIsReceiverOrHiddenPrototype()) {
return SetDataProperty(it, value);
}
V8_FALLTHROUGH;
case LookupIterator::TRANSITION:
*found = false;
return Nothing<bool>();
}
it->Next();
} while (it->IsFound());
*found = false;
return Nothing<bool>();
}
Maybe<bool> Object::SetProperty(LookupIterator* it, Handle<Object> value,
StoreOrigin store_origin,
Maybe<ShouldThrow> should_throw) {
if (it->IsFound()) {
bool found = true;
Maybe<bool> result =
SetPropertyInternal(it, value, should_throw, store_origin, &found);
if (found) return result;
}
// If the receiver is the JSGlobalObject, the store was contextual. In case
// the property did not exist yet on the global object itself, we have to
// throw a reference error in strict mode. In sloppy mode, we continue.
if (it->GetReceiver()->IsJSGlobalObject() &&
(GetShouldThrow(it->isolate(), should_throw) ==
ShouldThrow::kThrowOnError)) {
it->isolate()->Throw(*it->isolate()->factory()->NewReferenceError(
MessageTemplate::kNotDefined, it->GetName()));
return Nothing<bool>();
}
return AddDataProperty(it, value, NONE, should_throw, store_origin);
}
Maybe<bool> Object::SetSuperProperty(LookupIterator* it, Handle<Object> value,
StoreOrigin store_origin,
Maybe<ShouldThrow> should_throw) {
Isolate* isolate = it->isolate();
if (it->IsFound()) {
bool found = true;
Maybe<bool> result =
SetPropertyInternal(it, value, should_throw, store_origin, &found);
if (found) return result;
}
it->UpdateProtector();
// The property either doesn't exist on the holder or exists there as a data
// property.
if (!it->GetReceiver()->IsJSReceiver()) {
return WriteToReadOnlyProperty(it, value, should_throw);
}
Handle<JSReceiver> receiver = Handle<JSReceiver>::cast(it->GetReceiver());
LookupIterator::Configuration c = LookupIterator::OWN;
LookupIterator own_lookup =
it->IsElement() ? LookupIterator(isolate, receiver, it->index(), c)
: LookupIterator(isolate, receiver, it->name(), c);
for (; own_lookup.IsFound(); own_lookup.Next()) {
switch (own_lookup.state()) {
case LookupIterator::ACCESS_CHECK:
if (!own_lookup.HasAccess()) {
return JSObject::SetPropertyWithFailedAccessCheck(&own_lookup, value,
should_throw);
}
break;
case LookupIterator::ACCESSOR:
if (own_lookup.GetAccessors()->IsAccessorInfo()) {
if (own_lookup.IsReadOnly()) {
return WriteToReadOnlyProperty(&own_lookup, value, should_throw);
}
return Object::SetPropertyWithAccessor(&own_lookup, value,
should_throw);
}
V8_FALLTHROUGH;
case LookupIterator::INTEGER_INDEXED_EXOTIC:
return RedefineIncompatibleProperty(isolate, it->GetName(), value,
should_throw);
case LookupIterator::DATA: {
if (own_lookup.IsReadOnly()) {
return WriteToReadOnlyProperty(&own_lookup, value, should_throw);
}
return SetDataProperty(&own_lookup, value);
}
case LookupIterator::INTERCEPTOR:
case LookupIterator::JSPROXY: {
PropertyDescriptor desc;
Maybe<bool> owned =
JSReceiver::GetOwnPropertyDescriptor(&own_lookup, &desc);
MAYBE_RETURN(owned, Nothing<bool>());
if (!owned.FromJust()) {
return JSReceiver::CreateDataProperty(&own_lookup, value,
should_throw);
}
if (PropertyDescriptor::IsAccessorDescriptor(&desc) ||
!desc.writable()) {
return RedefineIncompatibleProperty(isolate, it->GetName(), value,
should_throw);
}
PropertyDescriptor value_desc;
value_desc.set_value(value);
return JSReceiver::DefineOwnProperty(isolate, receiver, it->GetName(),
&value_desc, should_throw);
}
case LookupIterator::NOT_FOUND:
case LookupIterator::TRANSITION:
UNREACHABLE();
}
}
return AddDataProperty(&own_lookup, value, NONE, should_throw, store_origin);
}
Maybe<bool> Object::CannotCreateProperty(Isolate* isolate,
Handle<Object> receiver,
Handle<Object> name,
Handle<Object> value,
Maybe<ShouldThrow> should_throw) {
RETURN_FAILURE(
isolate, GetShouldThrow(isolate, should_throw),
NewTypeError(MessageTemplate::kStrictCannotCreateProperty, name,
Object::TypeOf(isolate, receiver), receiver));
}
Maybe<bool> Object::WriteToReadOnlyProperty(
LookupIterator* it, Handle<Object> value,
Maybe<ShouldThrow> maybe_should_throw) {
ShouldThrow should_throw = GetShouldThrow(it->isolate(), maybe_should_throw);
if (it->IsFound() && !it->HolderIsReceiver()) {
// "Override mistake" attempted, record a use count to track this per
// v8:8175
v8::Isolate::UseCounterFeature feature =
should_throw == kThrowOnError
? v8::Isolate::kAttemptOverrideReadOnlyOnPrototypeStrict
: v8::Isolate::kAttemptOverrideReadOnlyOnPrototypeSloppy;
it->isolate()->CountUsage(feature);
}
return WriteToReadOnlyProperty(it->isolate(), it->GetReceiver(),
it->GetName(), value, should_throw);
}
Maybe<bool> Object::WriteToReadOnlyProperty(Isolate* isolate,
Handle<Object> receiver,
Handle<Object> name,
Handle<Object> value,
ShouldThrow should_throw) {
RETURN_FAILURE(isolate, should_throw,
NewTypeError(MessageTemplate::kStrictReadOnlyProperty, name,
Object::TypeOf(isolate, receiver), receiver));
}
Maybe<bool> Object::RedefineIncompatibleProperty(
Isolate* isolate, Handle<Object> name, Handle<Object> value,
Maybe<ShouldThrow> should_throw) {
RETURN_FAILURE(isolate, GetShouldThrow(isolate, should_throw),
NewTypeError(MessageTemplate::kRedefineDisallowed, name));
}
Maybe<bool> Object::SetDataProperty(LookupIterator* it, Handle<Object> value) {
DCHECK_IMPLIES(it->GetReceiver()->IsJSProxy(),
it->GetName()->IsPrivateName());
DCHECK_IMPLIES(!it->IsElement() && it->GetName()->IsPrivateName(),
it->state() == LookupIterator::DATA);
Handle<JSReceiver> receiver = Handle<JSReceiver>::cast(it->GetReceiver());
// Store on the holder which may be hidden behind the receiver.
DCHECK(it->HolderIsReceiverOrHiddenPrototype());
Handle<Object> to_assign = value;
// Convert the incoming value to a number for storing into typed arrays.
if (it->IsElement() && receiver->IsJSObject() &&
JSObject::cast(*receiver).HasTypedArrayElements()) {
ElementsKind elements_kind = JSObject::cast(*receiver).GetElementsKind();
if (elements_kind == BIGINT64_ELEMENTS ||
elements_kind == BIGUINT64_ELEMENTS) {
ASSIGN_RETURN_ON_EXCEPTION_VALUE(it->isolate(), to_assign,
BigInt::FromObject(it->isolate(), value),
Nothing<bool>());
// We have to recheck the length. However, it can only change if the
// underlying buffer was detached, so just check that.
if (Handle<JSArrayBufferView>::cast(receiver)->WasDetached()) {
return Just(true);
// TODO(neis): According to the spec, this should throw a TypeError.
}
} else if (!value->IsNumber() && !value->IsUndefined(it->isolate())) {
ASSIGN_RETURN_ON_EXCEPTION_VALUE(it->isolate(), to_assign,
Object::ToNumber(it->isolate(), value),
Nothing<bool>());
// We have to recheck the length. However, it can only change if the
// underlying buffer was detached, so just check that.
if (Handle<JSArrayBufferView>::cast(receiver)->WasDetached()) {
return Just(true);
// TODO(neis): According to the spec, this should throw a TypeError.
}
}
}
// Possibly migrate to the most up-to-date map that will be able to store
// |value| under it->name().
it->PrepareForDataProperty(to_assign);
// Write the property value.
it->WriteDataValue(to_assign, false);
#if VERIFY_HEAP
if (FLAG_verify_heap) {
receiver->HeapObjectVerify(it->isolate());
}
#endif
return Just(true);
}
Maybe<bool> Object::AddDataProperty(LookupIterator* it, Handle<Object> value,
PropertyAttributes attributes,
Maybe<ShouldThrow> should_throw,
StoreOrigin store_origin) {
if (!it->GetReceiver()->IsJSReceiver()) {
return CannotCreateProperty(it->isolate(), it->GetReceiver(), it->GetName(),
value, should_throw);
}
// Private symbols should be installed on JSProxy using
// JSProxy::SetPrivateSymbol.
if (it->GetReceiver()->IsJSProxy() && it->GetName()->IsPrivate() &&
!it->GetName()->IsPrivateName()) {
RETURN_FAILURE(it->isolate(), GetShouldThrow(it->isolate(), should_throw),
NewTypeError(MessageTemplate::kProxyPrivate));
}
DCHECK_NE(LookupIterator::INTEGER_INDEXED_EXOTIC, it->state());
Handle<JSReceiver> receiver = it->GetStoreTarget<JSReceiver>();
DCHECK_IMPLIES(receiver->IsJSProxy(), it->GetName()->IsPrivateName());
DCHECK_IMPLIES(receiver->IsJSProxy(),
it->state() == LookupIterator::NOT_FOUND);
// If the receiver is a JSGlobalProxy, store on the prototype (JSGlobalObject)
// instead. If the prototype is Null, the proxy is detached.
if (receiver->IsJSGlobalProxy()) return Just(true);
Isolate* isolate = it->isolate();
if (it->ExtendingNonExtensible(receiver)) {
RETURN_FAILURE(
isolate, GetShouldThrow(it->isolate(), should_throw),
NewTypeError(MessageTemplate::kObjectNotExtensible, it->GetName()));
}
if (it->IsElement(*receiver)) {
if (receiver->IsJSArray()) {
Handle<JSArray> array = Handle<JSArray>::cast(receiver);
if (JSArray::WouldChangeReadOnlyLength(array, it->array_index())) {
RETURN_FAILURE(isolate, GetShouldThrow(it->isolate(), should_throw),
NewTypeError(MessageTemplate::kStrictReadOnlyProperty,
isolate->factory()->length_string(),
Object::TypeOf(isolate, array), array));
}
}
Handle<JSObject> receiver_obj = Handle<JSObject>::cast(receiver);
JSObject::AddDataElement(receiver_obj, it->array_index(), value,
attributes);
JSObject::ValidateElements(*receiver_obj);
return Just(true);
} else {
it->UpdateProtector();
// Migrate to the most up-to-date map that will be able to store |value|
// under it->name() with |attributes|.
it->PrepareTransitionToDataProperty(receiver, value, attributes,
store_origin);
DCHECK_EQ(LookupIterator::TRANSITION, it->state());
it->ApplyTransitionToDataProperty(receiver);
// Write the property value.
it->WriteDataValue(value, true);
#if VERIFY_HEAP
if (FLAG_verify_heap) {
receiver->HeapObjectVerify(isolate);
}
#endif
}
return Just(true);
}
template <class T>
static int AppendUniqueCallbacks(Isolate* isolate,
Handle<TemplateList> callbacks,
Handle<typename T::Array> array,
int valid_descriptors) {
int nof_callbacks = callbacks->length();
// Fill in new callback descriptors. Process the callbacks from
// back to front so that the last callback with a given name takes
// precedence over previously added callbacks with that name.
for (int i = nof_callbacks - 1; i >= 0; i--) {
Handle<AccessorInfo> entry(AccessorInfo::cast(callbacks->get(i)), isolate);
Handle<Name> key(Name::cast(entry->name()), isolate);
DCHECK(key->IsUniqueName());
// Check if a descriptor with this name already exists before writing.
if (!T::Contains(key, entry, valid_descriptors, array)) {
T::Insert(key, entry, valid_descriptors, array);
valid_descriptors++;
}
}
return valid_descriptors;
}
struct FixedArrayAppender {
using Array = FixedArray;
static bool Contains(Handle<Name> key, Handle<AccessorInfo> entry,
int valid_descriptors, Handle<FixedArray> array) {
for (int i = 0; i < valid_descriptors; i++) {
if (*key == AccessorInfo::cast(array->get(i)).name()) return true;
}
return false;
}
static void Insert(Handle<Name> key, Handle<AccessorInfo> entry,
int valid_descriptors, Handle<FixedArray> array) {
DisallowHeapAllocation no_gc;
array->set(valid_descriptors, *entry);
}
};
int AccessorInfo::AppendUnique(Isolate* isolate, Handle<Object> descriptors,
Handle<FixedArray> array,
int valid_descriptors) {
Handle<TemplateList> callbacks = Handle<TemplateList>::cast(descriptors);
DCHECK_GE(array->length(), callbacks->length() + valid_descriptors);
return AppendUniqueCallbacks<FixedArrayAppender>(isolate, callbacks, array,
valid_descriptors);
}
void JSProxy::Revoke(Handle<JSProxy> proxy) {
Isolate* isolate = proxy->GetIsolate();
// ES#sec-proxy-revocation-functions
if (!proxy->IsRevoked()) {
// 5. Set p.[[ProxyTarget]] to null.
proxy->set_target(ReadOnlyRoots(isolate).null_value());
// 6. Set p.[[ProxyHandler]] to null.
proxy->set_handler(ReadOnlyRoots(isolate).null_value());
}
DCHECK(proxy->IsRevoked());
}
// static
Maybe<bool> JSProxy::IsArray(Handle<JSProxy> proxy) {
Isolate* isolate = proxy->GetIsolate();
Handle<JSReceiver> object = Handle<JSReceiver>::cast(proxy);
for (int i = 0; i < JSProxy::kMaxIterationLimit; i++) {
Handle<JSProxy> proxy = Handle<JSProxy>::cast(object);
if (proxy->IsRevoked()) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyRevoked,
isolate->factory()->NewStringFromAsciiChecked("IsArray")));
return Nothing<bool>();
}
object = handle(JSReceiver::cast(proxy->target()), isolate);
if (object->IsJSArray()) return Just(true);
if (!object->IsJSProxy()) return Just(false);
}
// Too deep recursion, throw a RangeError.
isolate->StackOverflow();
return Nothing<bool>();
}
Maybe<bool> JSProxy::HasProperty(Isolate* isolate, Handle<JSProxy> proxy,
Handle<Name> name) {
DCHECK(!name->IsPrivate());
STACK_CHECK(isolate, Nothing<bool>());
// 1. (Assert)
// 2. Let handler be the value of the [[ProxyHandler]] internal slot of O.
Handle<Object> handler(proxy->handler(), isolate);
// 3. If handler is null, throw a TypeError exception.
// 4. Assert: Type(handler) is Object.
if (proxy->IsRevoked()) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyRevoked, isolate->factory()->has_string()));
return Nothing<bool>();
}
// 5. Let target be the value of the [[ProxyTarget]] internal slot of O.
Handle<JSReceiver> target(JSReceiver::cast(proxy->target()), isolate);
// 6. Let trap be ? GetMethod(handler, "has").
Handle<Object> trap;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap,
Object::GetMethod(Handle<JSReceiver>::cast(handler),
isolate->factory()->has_string()),
Nothing<bool>());
// 7. If trap is undefined, then
if (trap->IsUndefined(isolate)) {
// 7a. Return target.[[HasProperty]](P).
return JSReceiver::HasProperty(target, name);
}
// 8. Let booleanTrapResult be ToBoolean(? Call(trap, handler, «target, P»)).
Handle<Object> trap_result_obj;
Handle<Object> args[] = {target, name};
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap_result_obj,
Execution::Call(isolate, trap, handler, arraysize(args), args),
Nothing<bool>());
bool boolean_trap_result = trap_result_obj->BooleanValue(isolate);
// 9. If booleanTrapResult is false, then:
if (!boolean_trap_result) {
MAYBE_RETURN(JSProxy::CheckHasTrap(isolate, name, target), Nothing<bool>());
}
// 10. Return booleanTrapResult.
return Just(boolean_trap_result);
}
Maybe<bool> JSProxy::CheckHasTrap(Isolate* isolate, Handle<Name> name,
Handle<JSReceiver> target) {
// 9a. Let targetDesc be ? target.[[GetOwnProperty]](P).
PropertyDescriptor target_desc;
Maybe<bool> target_found =
JSReceiver::GetOwnPropertyDescriptor(isolate, target, name, &target_desc);
MAYBE_RETURN(target_found, Nothing<bool>());
// 9b. If targetDesc is not undefined, then:
if (target_found.FromJust()) {
// 9b i. If targetDesc.[[Configurable]] is false, throw a TypeError
// exception.
if (!target_desc.configurable()) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyHasNonConfigurable, name));
return Nothing<bool>();
}
// 9b ii. Let extensibleTarget be ? IsExtensible(target).
Maybe<bool> extensible_target = JSReceiver::IsExtensible(target);
MAYBE_RETURN(extensible_target, Nothing<bool>());
// 9b iii. If extensibleTarget is false, throw a TypeError exception.
if (!extensible_target.FromJust()) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyHasNonExtensible, name));
return Nothing<bool>();
}
}
return Just(true);
}
Maybe<bool> JSProxy::SetProperty(Handle<JSProxy> proxy, Handle<Name> name,
Handle<Object> value, Handle<Object> receiver,
Maybe<ShouldThrow> should_throw) {
DCHECK(!name->IsPrivate());
Isolate* isolate = proxy->GetIsolate();
STACK_CHECK(isolate, Nothing<bool>());
Factory* factory = isolate->factory();
Handle<String> trap_name = factory->set_string();
if (proxy->IsRevoked()) {
isolate->Throw(
*factory->NewTypeError(MessageTemplate::kProxyRevoked, trap_name));
return Nothing<bool>();
}
Handle<JSReceiver> target(JSReceiver::cast(proxy->target()), isolate);
Handle<JSReceiver> handler(JSReceiver::cast(proxy->handler()), isolate);
Handle<Object> trap;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap, Object::GetMethod(handler, trap_name), Nothing<bool>());
if (trap->IsUndefined(isolate)) {
LookupIterator::Key key(isolate, name);
LookupIterator it(isolate, receiver, key, target);
return Object::SetSuperProperty(&it, value, StoreOrigin::kMaybeKeyed,
should_throw);
}
Handle<Object> trap_result;
Handle<Object> args[] = {target, name, value, receiver};
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap_result,
Execution::Call(isolate, trap, handler, arraysize(args), args),
Nothing<bool>());
if (!trap_result->BooleanValue(isolate)) {
RETURN_FAILURE(isolate, GetShouldThrow(isolate, should_throw),
NewTypeError(MessageTemplate::kProxyTrapReturnedFalsishFor,
trap_name, name));
}
MaybeHandle<Object> result =
JSProxy::CheckGetSetTrapResult(isolate, name, target, value, kSet);
if (result.is_null()) {
return Nothing<bool>();
}
return Just(true);
}
Maybe<bool> JSProxy::DeletePropertyOrElement(Handle<JSProxy> proxy,
Handle<Name> name,
LanguageMode language_mode) {
DCHECK(!name->IsPrivate());
ShouldThrow should_throw =
is_sloppy(language_mode) ? kDontThrow : kThrowOnError;
Isolate* isolate = proxy->GetIsolate();
STACK_CHECK(isolate, Nothing<bool>());
Factory* factory = isolate->factory();
Handle<String> trap_name = factory->deleteProperty_string();
if (proxy->IsRevoked()) {
isolate->Throw(
*factory->NewTypeError(MessageTemplate::kProxyRevoked, trap_name));
return Nothing<bool>();
}
Handle<JSReceiver> target(JSReceiver::cast(proxy->target()), isolate);
Handle<JSReceiver> handler(JSReceiver::cast(proxy->handler()), isolate);
Handle<Object> trap;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap, Object::GetMethod(handler, trap_name), Nothing<bool>());
if (trap->IsUndefined(isolate)) {
return JSReceiver::DeletePropertyOrElement(target, name, language_mode);
}
Handle<Object> trap_result;
Handle<Object> args[] = {target, name};
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap_result,
Execution::Call(isolate, trap, handler, arraysize(args), args),
Nothing<bool>());
if (!trap_result->BooleanValue(isolate)) {
RETURN_FAILURE(isolate, should_throw,
NewTypeError(MessageTemplate::kProxyTrapReturnedFalsishFor,
trap_name, name));
}
// Enforce the invariant.
return JSProxy::CheckDeleteTrap(isolate, name, target);
}
Maybe<bool> JSProxy::CheckDeleteTrap(Isolate* isolate, Handle<Name> name,
Handle<JSReceiver> target) {
// 10. Let targetDesc be ? target.[[GetOwnProperty]](P).
PropertyDescriptor target_desc;
Maybe<bool> target_found =
JSReceiver::GetOwnPropertyDescriptor(isolate, target, name, &target_desc);
MAYBE_RETURN(target_found, Nothing<bool>());
// 11. If targetDesc is undefined, return true.
if (target_found.FromJust()) {
// 12. If targetDesc.[[Configurable]] is false, throw a TypeError exception.
if (!target_desc.configurable()) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyDeletePropertyNonConfigurable, name));
return Nothing<bool>();
}
// 13. Let extensibleTarget be ? IsExtensible(target).
Maybe<bool> extensible_target = JSReceiver::IsExtensible(target);
MAYBE_RETURN(extensible_target, Nothing<bool>());
// 14. If extensibleTarget is false, throw a TypeError exception.
if (!extensible_target.FromJust()) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyDeletePropertyNonExtensible, name));
return Nothing<bool>();
}
}
return Just(true);
}
// static
MaybeHandle<JSProxy> JSProxy::New(Isolate* isolate, Handle<Object> target,
Handle<Object> handler) {
if (!target->IsJSReceiver()) {
THROW_NEW_ERROR(isolate, NewTypeError(MessageTemplate::kProxyNonObject),
JSProxy);
}
if (!handler->IsJSReceiver()) {
THROW_NEW_ERROR(isolate, NewTypeError(MessageTemplate::kProxyNonObject),
JSProxy);
}
return isolate->factory()->NewJSProxy(Handle<JSReceiver>::cast(target),
Handle<JSReceiver>::cast(handler));
}
// static
MaybeHandle<NativeContext> JSProxy::GetFunctionRealm(Handle<JSProxy> proxy) {
DCHECK(proxy->map().is_constructor());
if (proxy->IsRevoked()) {
THROW_NEW_ERROR(proxy->GetIsolate(),
NewTypeError(MessageTemplate::kProxyRevoked),
NativeContext);
}
Handle<JSReceiver> target(JSReceiver::cast(proxy->target()),
proxy->GetIsolate());
return JSReceiver::GetFunctionRealm(target);
}
Maybe<PropertyAttributes> JSProxy::GetPropertyAttributes(LookupIterator* it) {
PropertyDescriptor desc;
Maybe<bool> found = JSProxy::GetOwnPropertyDescriptor(
it->isolate(), it->GetHolder<JSProxy>(), it->GetName(), &desc);
MAYBE_RETURN(found, Nothing<PropertyAttributes>());
if (!found.FromJust()) return Just(ABSENT);
return Just(desc.ToAttributes());
}
// TODO(jkummerow): Consider unification with FastAsArrayLength() in
// accessors.cc.
bool PropertyKeyToArrayLength(Handle<Object> value, uint32_t* length) {
DCHECK(value->IsNumber() || value->IsName());
if (value->ToArrayLength(length)) return true;
if (value->IsString()) return String::cast(*value).AsArrayIndex(length);
return false;
}
bool PropertyKeyToArrayIndex(Handle<Object> index_obj, uint32_t* output) {
return PropertyKeyToArrayLength(index_obj, output) && *output != kMaxUInt32;
}
// ES6 9.4.2.1
// static
Maybe<bool> JSArray::DefineOwnProperty(Isolate* isolate, Handle<JSArray> o,
Handle<Object> name,
PropertyDescriptor* desc,
Maybe<ShouldThrow> should_throw) {
// 1. Assert: IsPropertyKey(P) is true. ("P" is |name|.)
// 2. If P is "length", then:
// TODO(jkummerow): Check if we need slow string comparison.
if (*name == ReadOnlyRoots(isolate).length_string()) {
// 2a. Return ArraySetLength(A, Desc).
return ArraySetLength(isolate, o, desc, should_throw);
}
// 3. Else if P is an array index, then:
uint32_t index = 0;
if (PropertyKeyToArrayIndex(name, &index)) {
// 3a. Let oldLenDesc be OrdinaryGetOwnProperty(A, "length").
PropertyDescriptor old_len_desc;
Maybe<bool> success = GetOwnPropertyDescriptor(
isolate, o, isolate->factory()->length_string(), &old_len_desc);
// 3b. (Assert)
DCHECK(success.FromJust());
USE(success);
// 3c. Let oldLen be oldLenDesc.[[Value]].
uint32_t old_len = 0;
CHECK(old_len_desc.value()->ToArrayLength(&old_len));
// 3d. Let index be ToUint32(P).
// (Already done above.)
// 3e. (Assert)
// 3f. If index >= oldLen and oldLenDesc.[[Writable]] is false,
// return false.
if (index >= old_len && old_len_desc.has_writable() &&
!old_len_desc.writable()) {
RETURN_FAILURE(isolate, GetShouldThrow(isolate, should_throw),
NewTypeError(MessageTemplate::kDefineDisallowed, name));
}
// 3g. Let succeeded be OrdinaryDefineOwnProperty(A, P, Desc).
Maybe<bool> succeeded =
OrdinaryDefineOwnProperty(isolate, o, name, desc, should_throw);
// 3h. Assert: succeeded is not an abrupt completion.
// In our case, if should_throw == kThrowOnError, it can be!
// 3i. If succeeded is false, return false.
if (succeeded.IsNothing() || !succeeded.FromJust()) return succeeded;
// 3j. If index >= oldLen, then:
if (index >= old_len) {
// 3j i. Set oldLenDesc.[[Value]] to index + 1.
old_len_desc.set_value(isolate->factory()->NewNumberFromUint(index + 1));
// 3j ii. Let succeeded be
// OrdinaryDefineOwnProperty(A, "length", oldLenDesc).
succeeded = OrdinaryDefineOwnProperty(isolate, o,
isolate->factory()->length_string(),
&old_len_desc, should_throw);
// 3j iii. Assert: succeeded is true.
DCHECK(succeeded.FromJust());
USE(succeeded);
}
// 3k. Return true.
return Just(true);
}
// 4. Return OrdinaryDefineOwnProperty(A, P, Desc).
return OrdinaryDefineOwnProperty(isolate, o, name, desc, should_throw);
}
// Part of ES6 9.4.2.4 ArraySetLength.
// static
bool JSArray::AnythingToArrayLength(Isolate* isolate,
Handle<Object> length_object,
uint32_t* output) {
// Fast path: check numbers and strings that can be converted directly
// and unobservably.
if (length_object->ToArrayLength(output)) return true;
if (length_object->IsString() &&
Handle<String>::cast(length_object)->AsArrayIndex(output)) {
return true;
}
// Slow path: follow steps in ES6 9.4.2.4 "ArraySetLength".
// 3. Let newLen be ToUint32(Desc.[[Value]]).
Handle<Object> uint32_v;
if (!Object::ToUint32(isolate, length_object).ToHandle(&uint32_v)) {
// 4. ReturnIfAbrupt(newLen).
return false;
}
// 5. Let numberLen be ToNumber(Desc.[[Value]]).
Handle<Object> number_v;
if (!Object::ToNumber(isolate, length_object).ToHandle(&number_v)) {
// 6. ReturnIfAbrupt(newLen).
return false;
}
// 7. If newLen != numberLen, throw a RangeError exception.
if (uint32_v->Number() != number_v->Number()) {
Handle<Object> exception =
isolate->factory()->NewRangeError(MessageTemplate::kInvalidArrayLength);
isolate->Throw(*exception);
return false;
}
CHECK(uint32_v->ToArrayLength(output));
return true;
}
// ES6 9.4.2.4
// static
Maybe<bool> JSArray::ArraySetLength(Isolate* isolate, Handle<JSArray> a,
PropertyDescriptor* desc,
Maybe<ShouldThrow> should_throw) {
// 1. If the [[Value]] field of Desc is absent, then
if (!desc->has_value()) {
// 1a. Return OrdinaryDefineOwnProperty(A, "length", Desc).
return OrdinaryDefineOwnProperty(
isolate, a, isolate->factory()->length_string(), desc, should_throw);
}
// 2. Let newLenDesc be a copy of Desc.
// (Actual copying is not necessary.)
PropertyDescriptor* new_len_desc = desc;
// 3. - 7. Convert Desc.[[Value]] to newLen.
uint32_t new_len = 0;
if (!AnythingToArrayLength(isolate, desc->value(), &new_len)) {
DCHECK(isolate->has_pending_exception());
return Nothing<bool>();
}
// 8. Set newLenDesc.[[Value]] to newLen.
// (Done below, if needed.)
// 9. Let oldLenDesc be OrdinaryGetOwnProperty(A, "length").
PropertyDescriptor old_len_desc;
Maybe<bool> success = GetOwnPropertyDescriptor(
isolate, a, isolate->factory()->length_string(), &old_len_desc);
// 10. (Assert)
DCHECK(success.FromJust());
USE(success);
// 11. Let oldLen be oldLenDesc.[[Value]].
uint32_t old_len = 0;
CHECK(old_len_desc.value()->ToArrayLength(&old_len));
// 12. If newLen >= oldLen, then
if (new_len >= old_len) {
// 8. Set newLenDesc.[[Value]] to newLen.
// 12a. Return OrdinaryDefineOwnProperty(A, "length", newLenDesc).
new_len_desc->set_value(isolate->factory()->NewNumberFromUint(new_len));
return OrdinaryDefineOwnProperty(isolate, a,
isolate->factory()->length_string(),
new_len_desc, should_throw);
}
// 13. If oldLenDesc.[[Writable]] is false, return false.
if (!old_len_desc.writable() ||
// Also handle the {configurable: true} case since we later use
// JSArray::SetLength instead of OrdinaryDefineOwnProperty to change
// the length, and it doesn't have access to the descriptor anymore.
new_len_desc->configurable()) {
RETURN_FAILURE(isolate, GetShouldThrow(isolate, should_throw),
NewTypeError(MessageTemplate::kRedefineDisallowed,
isolate->factory()->length_string()));
}
// 14. If newLenDesc.[[Writable]] is absent or has the value true,
// let newWritable be true.
bool new_writable = false;
if (!new_len_desc->has_writable() || new_len_desc->writable()) {
new_writable = true;
} else {
// 15. Else,
// 15a. Need to defer setting the [[Writable]] attribute to false in case
// any elements cannot be deleted.
// 15b. Let newWritable be false. (It's initialized as "false" anyway.)
// 15c. Set newLenDesc.[[Writable]] to true.
// (Not needed.)
}
// Most of steps 16 through 19 is implemented by JSArray::SetLength.
JSArray::SetLength(a, new_len);
// Steps 19d-ii, 20.
if (!new_writable) {
PropertyDescriptor readonly;
readonly.set_writable(false);
Maybe<bool> success = OrdinaryDefineOwnProperty(
isolate, a, isolate->factory()->length_string(), &readonly,
should_throw);
DCHECK(success.FromJust());
USE(success);
}
uint32_t actual_new_len = 0;
CHECK(a->length().ToArrayLength(&actual_new_len));
// Steps 19d-v, 21. Return false if there were non-deletable elements.
bool result = actual_new_len == new_len;
if (!result) {
RETURN_FAILURE(
isolate, GetShouldThrow(isolate, should_throw),
NewTypeError(MessageTemplate::kStrictDeleteProperty,
isolate->factory()->NewNumberFromUint(actual_new_len - 1),
a));
}
return Just(result);
}
// ES6 9.5.6
// static
Maybe<bool> JSProxy::DefineOwnProperty(Isolate* isolate, Handle<JSProxy> proxy,
Handle<Object> key,
PropertyDescriptor* desc,
Maybe<ShouldThrow> should_throw) {
STACK_CHECK(isolate, Nothing<bool>());
if (key->IsSymbol() && Handle<Symbol>::cast(key)->IsPrivate()) {
DCHECK(!Handle<Symbol>::cast(key)->IsPrivateName());
return JSProxy::SetPrivateSymbol(isolate, proxy, Handle<Symbol>::cast(key),
desc, should_throw);
}
Handle<String> trap_name = isolate->factory()->defineProperty_string();
// 1. Assert: IsPropertyKey(P) is true.
DCHECK(key->IsName() || key->IsNumber());
// 2. Let handler be the value of the [[ProxyHandler]] internal slot of O.
Handle<Object> handler(proxy->handler(), isolate);
// 3. If handler is null, throw a TypeError exception.
// 4. Assert: Type(handler) is Object.
if (proxy->IsRevoked()) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyRevoked, trap_name));
return Nothing<bool>();
}
// 5. Let target be the value of the [[ProxyTarget]] internal slot of O.
Handle<JSReceiver> target(JSReceiver::cast(proxy->target()), isolate);
// 6. Let trap be ? GetMethod(handler, "defineProperty").
Handle<Object> trap;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap,
Object::GetMethod(Handle<JSReceiver>::cast(handler), trap_name),
Nothing<bool>());
// 7. If trap is undefined, then:
if (trap->IsUndefined(isolate)) {
// 7a. Return target.[[DefineOwnProperty]](P, Desc).
return JSReceiver::DefineOwnProperty(isolate, target, key, desc,
should_throw);
}
// 8. Let descObj be FromPropertyDescriptor(Desc).
Handle<Object> desc_obj = desc->ToObject(isolate);
// 9. Let booleanTrapResult be
// ToBoolean(? Call(trap, handler, «target, P, descObj»)).
Handle<Name> property_name =
key->IsName()
? Handle<Name>::cast(key)
: Handle<Name>::cast(isolate->factory()->NumberToString(key));
// Do not leak private property names.
DCHECK(!property_name->IsPrivate());
Handle<Object> trap_result_obj;
Handle<Object> args[] = {target, property_name, desc_obj};
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap_result_obj,
Execution::Call(isolate, trap, handler, arraysize(args), args),
Nothing<bool>());
// 10. If booleanTrapResult is false, return false.
if (!trap_result_obj->BooleanValue(isolate)) {
RETURN_FAILURE(isolate, GetShouldThrow(isolate, should_throw),
NewTypeError(MessageTemplate::kProxyTrapReturnedFalsishFor,
trap_name, property_name));
}
// 11. Let targetDesc be ? target.[[GetOwnProperty]](P).
PropertyDescriptor target_desc;
Maybe<bool> target_found =
JSReceiver::GetOwnPropertyDescriptor(isolate, target, key, &target_desc);
MAYBE_RETURN(target_found, Nothing<bool>());
// 12. Let extensibleTarget be ? IsExtensible(target).
Maybe<bool> maybe_extensible = JSReceiver::IsExtensible(target);
MAYBE_RETURN(maybe_extensible, Nothing<bool>());
bool extensible_target = maybe_extensible.FromJust();
// 13. If Desc has a [[Configurable]] field and if Desc.[[Configurable]]
// is false, then:
// 13a. Let settingConfigFalse be true.
// 14. Else let settingConfigFalse be false.
bool setting_config_false = desc->has_configurable() && !desc->configurable();
// 15. If targetDesc is undefined, then
if (!target_found.FromJust()) {
// 15a. If extensibleTarget is false, throw a TypeError exception.
if (!extensible_target) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyDefinePropertyNonExtensible, property_name));
return Nothing<bool>();
}
// 15b. If settingConfigFalse is true, throw a TypeError exception.
if (setting_config_false) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyDefinePropertyNonConfigurable, property_name));
return Nothing<bool>();
}
} else {
// 16. Else targetDesc is not undefined,
// 16a. If IsCompatiblePropertyDescriptor(extensibleTarget, Desc,
// targetDesc) is false, throw a TypeError exception.
Maybe<bool> valid = IsCompatiblePropertyDescriptor(
isolate, extensible_target, desc, &target_desc, property_name,
Just(kDontThrow));
MAYBE_RETURN(valid, Nothing<bool>());
if (!valid.FromJust()) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyDefinePropertyIncompatible, property_name));
return Nothing<bool>();
}
// 16b. If settingConfigFalse is true and targetDesc.[[Configurable]] is
// true, throw a TypeError exception.
if (setting_config_false && target_desc.configurable()) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyDefinePropertyNonConfigurable, property_name));
return Nothing<bool>();
}
// 16c. If IsDataDescriptor(targetDesc) is true,
// targetDesc.[[Configurable]] is
// false, and targetDesc.[[Writable]] is true, then
if (PropertyDescriptor::IsDataDescriptor(&target_desc) &&
!target_desc.configurable() && target_desc.writable()) {
// 16c i. If Desc has a [[Writable]] field and Desc.[[Writable]] is false,
// throw a TypeError exception.
if (desc->has_writable() && !desc->writable()) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyDefinePropertyNonConfigurableWritable,
property_name));
return Nothing<bool>();
}
}
}
// 17. Return true.
return Just(true);
}
// static
Maybe<bool> JSProxy::SetPrivateSymbol(Isolate* isolate, Handle<JSProxy> proxy,
Handle<Symbol> private_name,
PropertyDescriptor* desc,
Maybe<ShouldThrow> should_throw) {
DCHECK(!private_name->IsPrivateName());
// Despite the generic name, this can only add private data properties.
if (!PropertyDescriptor::IsDataDescriptor(desc) ||
desc->ToAttributes() != DONT_ENUM) {
RETURN_FAILURE(isolate, GetShouldThrow(isolate, should_throw),
NewTypeError(MessageTemplate::kProxyPrivate));
}
DCHECK(proxy->map().is_dictionary_map());
Handle<Object> value =
desc->has_value()
? desc->value()
: Handle<Object>::cast(isolate->factory()->undefined_value());
LookupIterator it(isolate, proxy, private_name, proxy);
if (it.IsFound()) {
DCHECK_EQ(LookupIterator::DATA, it.state());
DCHECK_EQ(DONT_ENUM, it.property_attributes());
it.WriteDataValue(value, false);
return Just(true);
}
PropertyDetails details(kData, DONT_ENUM, PropertyCellType::kNoCell);
if (V8_DICT_MODE_PROTOTYPES_BOOL) {
Handle<OrderedNameDictionary> dict(proxy->property_dictionary_ordered(),
isolate);
Handle<OrderedNameDictionary> result =
OrderedNameDictionary::Add(isolate, dict, private_name, value, details)
.ToHandleChecked();
if (!dict.is_identical_to(result)) proxy->SetProperties(*result);
} else {
Handle<NameDictionary> dict(proxy->property_dictionary(), isolate);
Handle<NameDictionary> result =
NameDictionary::Add(isolate, dict, private_name, value, details);
if (!dict.is_identical_to(result)) proxy->SetProperties(*result);
}
return Just(true);
}
// ES6 9.5.5
// static
Maybe<bool> JSProxy::GetOwnPropertyDescriptor(Isolate* isolate,
Handle<JSProxy> proxy,
Handle<Name> name,
PropertyDescriptor* desc) {
DCHECK(!name->IsPrivate());
STACK_CHECK(isolate, Nothing<bool>());
Handle<String> trap_name =
isolate->factory()->getOwnPropertyDescriptor_string();
// 1. (Assert)
// 2. Let handler be the value of the [[ProxyHandler]] internal slot of O.
Handle<Object> handler(proxy->handler(), isolate);
// 3. If handler is null, throw a TypeError exception.
// 4. Assert: Type(handler) is Object.
if (proxy->IsRevoked()) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyRevoked, trap_name));
return Nothing<bool>();
}
// 5. Let target be the value of the [[ProxyTarget]] internal slot of O.
Handle<JSReceiver> target(JSReceiver::cast(proxy->target()), isolate);
// 6. Let trap be ? GetMethod(handler, "getOwnPropertyDescriptor").
Handle<Object> trap;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap,
Object::GetMethod(Handle<JSReceiver>::cast(handler), trap_name),
Nothing<bool>());
// 7. If trap is undefined, then
if (trap->IsUndefined(isolate)) {
// 7a. Return target.[[GetOwnProperty]](P).
return JSReceiver::GetOwnPropertyDescriptor(isolate, target, name, desc);
}
// 8. Let trapResultObj be ? Call(trap, handler, «target, P»).
Handle<Object> trap_result_obj;
Handle<Object> args[] = {target, name};
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap_result_obj,
Execution::Call(isolate, trap, handler, arraysize(args), args),
Nothing<bool>());
// 9. If Type(trapResultObj) is neither Object nor Undefined, throw a
// TypeError exception.
if (!trap_result_obj->IsJSReceiver() &&
!trap_result_obj->IsUndefined(isolate)) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyGetOwnPropertyDescriptorInvalid, name));
return Nothing<bool>();
}
// 10. Let targetDesc be ? target.[[GetOwnProperty]](P).
PropertyDescriptor target_desc;
Maybe<bool> found =
JSReceiver::GetOwnPropertyDescriptor(isolate, target, name, &target_desc);
MAYBE_RETURN(found, Nothing<bool>());
// 11. If trapResultObj is undefined, then
if (trap_result_obj->IsUndefined(isolate)) {
// 11a. If targetDesc is undefined, return undefined.
if (!found.FromJust()) return Just(false);
// 11b. If targetDesc.[[Configurable]] is false, throw a TypeError
// exception.
if (!target_desc.configurable()) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyGetOwnPropertyDescriptorUndefined, name));
return Nothing<bool>();
}
// 11c. Let extensibleTarget be ? IsExtensible(target).
Maybe<bool> extensible_target = JSReceiver::IsExtensible(target);
MAYBE_RETURN(extensible_target, Nothing<bool>());
// 11d. (Assert)
// 11e. If extensibleTarget is false, throw a TypeError exception.
if (!extensible_target.FromJust()) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyGetOwnPropertyDescriptorNonExtensible, name));
return Nothing<bool>();
}
// 11f. Return undefined.
return Just(false);
}
// 12. Let extensibleTarget be ? IsExtensible(target).
Maybe<bool> extensible_target = JSReceiver::IsExtensible(target);
MAYBE_RETURN(extensible_target, Nothing<bool>());
// 13. Let resultDesc be ? ToPropertyDescriptor(trapResultObj).
if (!PropertyDescriptor::ToPropertyDescriptor(isolate, trap_result_obj,
desc)) {
DCHECK(isolate->has_pending_exception());
return Nothing<bool>();
}
// 14. Call CompletePropertyDescriptor(resultDesc).
PropertyDescriptor::CompletePropertyDescriptor(isolate, desc);
// 15. Let valid be IsCompatiblePropertyDescriptor (extensibleTarget,
// resultDesc, targetDesc).
Maybe<bool> valid = IsCompatiblePropertyDescriptor(
isolate, extensible_target.FromJust(), desc, &target_desc, name,
Just(kDontThrow));
MAYBE_RETURN(valid, Nothing<bool>());
// 16. If valid is false, throw a TypeError exception.
if (!valid.FromJust()) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyGetOwnPropertyDescriptorIncompatible, name));
return Nothing<bool>();
}
// 17. If resultDesc.[[Configurable]] is false, then
if (!desc->configurable()) {
// 17a. If targetDesc is undefined or targetDesc.[[Configurable]] is true:
if (target_desc.is_empty() || target_desc.configurable()) {
// 17a i. Throw a TypeError exception.
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyGetOwnPropertyDescriptorNonConfigurable,
name));
return Nothing<bool>();
}
// 17b. If resultDesc has a [[Writable]] field and resultDesc.[[Writable]]
// is false, then
if (desc->has_writable() && !desc->writable()) {
// 17b i. If targetDesc.[[Writable]] is true, throw a TypeError exception.
if (target_desc.writable()) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::
kProxyGetOwnPropertyDescriptorNonConfigurableWritable,
name));
return Nothing<bool>();
}
}
}
// 18. Return resultDesc.
return Just(true);
}
Maybe<bool> JSProxy::PreventExtensions(Handle<JSProxy> proxy,
ShouldThrow should_throw) {
Isolate* isolate = proxy->GetIsolate();
STACK_CHECK(isolate, Nothing<bool>());
Factory* factory = isolate->factory();
Handle<String> trap_name = factory->preventExtensions_string();
if (proxy->IsRevoked()) {
isolate->Throw(
*factory->NewTypeError(MessageTemplate::kProxyRevoked, trap_name));
return Nothing<bool>();
}
Handle<JSReceiver> target(JSReceiver::cast(proxy->target()), isolate);
Handle<JSReceiver> handler(JSReceiver::cast(proxy->handler()), isolate);
Handle<Object> trap;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap, Object::GetMethod(handler, trap_name), Nothing<bool>());
if (trap->IsUndefined(isolate)) {
return JSReceiver::PreventExtensions(target, should_throw);
}
Handle<Object> trap_result;
Handle<Object> args[] = {target};
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap_result,
Execution::Call(isolate, trap, handler, arraysize(args), args),
Nothing<bool>());
if (!trap_result->BooleanValue(isolate)) {
RETURN_FAILURE(
isolate, should_throw,
NewTypeError(MessageTemplate::kProxyTrapReturnedFalsish, trap_name));
}
// Enforce the invariant.
Maybe<bool> target_result = JSReceiver::IsExtensible(target);
MAYBE_RETURN(target_result, Nothing<bool>());
if (target_result.FromJust()) {
isolate->Throw(*factory->NewTypeError(
MessageTemplate::kProxyPreventExtensionsExtensible));
return Nothing<bool>();
}
return Just(true);
}
Maybe<bool> JSProxy::IsExtensible(Handle<JSProxy> proxy) {
Isolate* isolate = proxy->GetIsolate();
STACK_CHECK(isolate, Nothing<bool>());
Factory* factory = isolate->factory();
Handle<String> trap_name = factory->isExtensible_string();
if (proxy->IsRevoked()) {
isolate->Throw(
*factory->NewTypeError(MessageTemplate::kProxyRevoked, trap_name));
return Nothing<bool>();
}
Handle<JSReceiver> target(JSReceiver::cast(proxy->target()), isolate);
Handle<JSReceiver> handler(JSReceiver::cast(proxy->handler()), isolate);
Handle<Object> trap;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap, Object::GetMethod(handler, trap_name), Nothing<bool>());
if (trap->IsUndefined(isolate)) {
return JSReceiver::IsExtensible(target);
}
Handle<Object> trap_result;
Handle<Object> args[] = {target};
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap_result,
Execution::Call(isolate, trap, handler, arraysize(args), args),
Nothing<bool>());
// Enforce the invariant.
Maybe<bool> target_result = JSReceiver::IsExtensible(target);
MAYBE_RETURN(target_result, Nothing<bool>());
if (target_result.FromJust() != trap_result->BooleanValue(isolate)) {
isolate->Throw(
*factory->NewTypeError(MessageTemplate::kProxyIsExtensibleInconsistent,
factory->ToBoolean(target_result.FromJust())));
return Nothing<bool>();
}
return target_result;
}
Handle<DescriptorArray> DescriptorArray::CopyUpTo(Isolate* isolate,
Handle<DescriptorArray> desc,
int enumeration_index,
int slack) {
return DescriptorArray::CopyUpToAddAttributes(isolate, desc,
enumeration_index, NONE, slack);
}
Handle<DescriptorArray> DescriptorArray::CopyUpToAddAttributes(
Isolate* isolate, Handle<DescriptorArray> desc, int enumeration_index,
PropertyAttributes attributes, int slack) {
if (enumeration_index + slack == 0) {
return isolate->factory()->empty_descriptor_array();
}
int size = enumeration_index;
Handle<DescriptorArray> descriptors =
DescriptorArray::Allocate(isolate, size, slack);
if (attributes != NONE) {
for (InternalIndex i : InternalIndex::Range(size)) {
MaybeObject value_or_field_type = desc->GetValue(i);
Name key = desc->GetKey(i);
PropertyDetails details = desc->GetDetails(i);
// Bulk attribute changes never affect private properties.
if (!key.IsPrivate()) {
int mask = DONT_DELETE | DONT_ENUM;
// READ_ONLY is an invalid attribute for JS setters/getters.
HeapObject heap_object;
if (details.kind() != kAccessor ||
!(value_or_field_type->GetHeapObjectIfStrong(&heap_object) &&
heap_object.IsAccessorPair())) {
mask |= READ_ONLY;
}
details = details.CopyAddAttributes(
static_cast<PropertyAttributes>(attributes & mask));
}
descriptors->Set(i, key, value_or_field_type, details);
}
} else {
for (InternalIndex i : InternalIndex::Range(size)) {
descriptors->CopyFrom(i, *desc);
}
}
if (desc->number_of_descriptors() != enumeration_index) descriptors->Sort();
return descriptors;
}
// Create a new descriptor array with only enumerable, configurable, writeable
// data properties, but identical field locations.
Handle<DescriptorArray> DescriptorArray::CopyForFastObjectClone(
Isolate* isolate, Handle<DescriptorArray> src, int enumeration_index,
int slack) {
if (enumeration_index + slack == 0) {
return isolate->factory()->empty_descriptor_array();
}
int size = enumeration_index;
Handle<DescriptorArray> descriptors =
DescriptorArray::Allocate(isolate, size, slack);
for (InternalIndex i : InternalIndex::Range(size)) {
Name key = src->GetKey(i);
PropertyDetails details = src->GetDetails(i);
Representation new_representation = details.representation();
DCHECK(!key.IsPrivateName());
DCHECK(details.IsEnumerable());
DCHECK_EQ(details.kind(), kData);
// If the new representation is an in-place changeable field, make it
// generic as possible (under in-place changes) to avoid type confusion if
// the source representation changes after this feedback has been collected.
MaybeObject type = src->GetValue(i);
if (details.location() == PropertyLocation::kField) {
type = MaybeObject::FromObject(FieldType::Any());
// TODO(bmeurer,ishell): Igor suggested to use some kind of dynamic
// checks in the fast-path for CloneObjectIC instead to avoid the
// need to generalize the descriptors here. That will also enable
// us to skip the defensive copying of the target map whenever a
// CloneObjectIC misses.
new_representation = new_representation.MostGenericInPlaceChange();
}
// Ensure the ObjectClone property details are NONE, and that all source
// details did not contain DONT_ENUM.
PropertyDetails new_details(kData, NONE, details.location(),
details.constness(), new_representation,
details.field_index());
descriptors->Set(i, key, type, new_details);
}
descriptors->Sort();
return descriptors;
}
bool DescriptorArray::IsEqualUpTo(DescriptorArray desc, int nof_descriptors) {
for (InternalIndex i : InternalIndex::Range(nof_descriptors)) {
if (GetKey(i) != desc.GetKey(i) || GetValue(i) != desc.GetValue(i)) {
return false;
}
PropertyDetails details = GetDetails(i);
PropertyDetails other_details = desc.GetDetails(i);
if (details.kind() != other_details.kind() ||
details.location() != other_details.location() ||
!details.representation().Equals(other_details.representation())) {
return false;
}
}
return true;
}
Handle<FixedArray> FixedArray::SetAndGrow(Isolate* isolate,
Handle<FixedArray> array, int index,
Handle<Object> value) {
if (index < array->length()) {
array->set(index, *value);
return array;
}
int capacity = array->length();
do {
capacity = JSObject::NewElementsCapacity(capacity);
} while (capacity <= index);
Handle<FixedArray> new_array =
isolate->factory()->NewUninitializedFixedArray(capacity);
array->CopyTo(0, *new_array, 0, array->length());
new_array->FillWithHoles(array->length(), new_array->length());
new_array->set(index, *value);
return new_array;
}
Handle<FixedArray> FixedArray::ShrinkOrEmpty(Isolate* isolate,
Handle<FixedArray> array,
int new_length) {
if (new_length == 0) {
return array->GetReadOnlyRoots().empty_fixed_array_handle();
} else {
array->Shrink(isolate, new_length);
return array;
}
}
void FixedArray::Shrink(Isolate* isolate, int new_length) {
DCHECK(0 < new_length && new_length <= length());
if (new_length < length()) {
isolate->heap()->RightTrimFixedArray(*this, length() - new_length);
}
}
void FixedArray::CopyTo(int pos, FixedArray dest, int dest_pos, int len) const {
DisallowHeapAllocation no_gc;
// Return early if len == 0 so that we don't try to read the write barrier off
// a canonical read-only empty fixed array.
if (len == 0) return;
WriteBarrierMode mode = dest.GetWriteBarrierMode(no_gc);
for (int index = 0; index < len; index++) {
dest.set(dest_pos + index, get(pos + index), mode);
}
}
// static
Handle<ArrayList> ArrayList::Add(Isolate* isolate, Handle<ArrayList> array,
Handle<Object> obj) {
int length = array->Length();
array = EnsureSpace(isolate, array, length + 1);
// Check that GC didn't remove elements from the array.
DCHECK_EQ(array->Length(), length);
array->Set(length, *obj);
array->SetLength(length + 1);
return array;
}
// static
Handle<ArrayList> ArrayList::Add(Isolate* isolate, Handle<ArrayList> array,
Handle<Object> obj1, Handle<Object> obj2) {
int length = array->Length();
array = EnsureSpace(isolate, array, length + 2);
// Check that GC didn't remove elements from the array.
DCHECK_EQ(array->Length(), length);
array->Set(length, *obj1);
array->Set(length + 1, *obj2);
array->SetLength(length + 2);
return array;
}
// static
Handle<ArrayList> ArrayList::New(Isolate* isolate, int size) {
Handle<FixedArray> fixed_array =
isolate->factory()->NewFixedArray(size + kFirstIndex);
fixed_array->set_map_no_write_barrier(
ReadOnlyRoots(isolate).array_list_map());
Handle<ArrayList> result = Handle<ArrayList>::cast(fixed_array);
result->SetLength(0);
return result;
}
Handle<FixedArray> ArrayList::Elements(Isolate* isolate,
Handle<ArrayList> array) {
int length = array->Length();
Handle<FixedArray> result = isolate->factory()->NewFixedArray(length);
// Do not copy the first entry, i.e., the length.
array->CopyTo(kFirstIndex, *result, 0, length);
return result;
}
namespace {
Handle<FixedArray> EnsureSpaceInFixedArray(Isolate* isolate,
Handle<FixedArray> array,
int length) {
int capacity = array->length();
if (capacity < length) {
int new_capacity = length;
new_capacity = new_capacity + std::max(new_capacity / 2, 2);
int grow_by = new_capacity - capacity;
array = isolate->factory()->CopyFixedArrayAndGrow(array, grow_by);
}
return array;
}
} // namespace
// static
Handle<ArrayList> ArrayList::EnsureSpace(Isolate* isolate,
Handle<ArrayList> array, int length) {
const bool empty = (array->length() == 0);
Handle<FixedArray> ret =
EnsureSpaceInFixedArray(isolate, array, kFirstIndex + length);
if (empty) {
ret->set_map_no_write_barrier(array->GetReadOnlyRoots().array_list_map());
Handle<ArrayList>::cast(ret)->SetLength(0);
}
return Handle<ArrayList>::cast(ret);
}
// static
Handle<WeakArrayList> WeakArrayList::AddToEnd(Isolate* isolate,
Handle<WeakArrayList> array,
const MaybeObjectHandle& value) {
int length = array->length();
array = EnsureSpace(isolate, array, length + 1);
// Reload length; GC might have removed elements from the array.
length = array->length();
array->Set(length, *value);
array->set_length(length + 1);
return array;
}
Handle<WeakArrayList> WeakArrayList::AddToEnd(Isolate* isolate,
Handle<WeakArrayList> array,
const MaybeObjectHandle& value1,
const MaybeObjectHandle& value2) {
int length = array->length();
array = EnsureSpace(isolate, array, length + 2);
// Reload length; GC might have removed elements from the array.
length = array->length();
array->Set(length, *value1);
array->Set(length + 1, *value2);
array->set_length(length + 2);
return array;
}
// static
Handle<WeakArrayList> WeakArrayList::Append(Isolate* isolate,
Handle<WeakArrayList> array,
const MaybeObjectHandle& value,
AllocationType allocation) {
int length = array->length();
if (length < array->capacity()) {
array->Set(length, *value);
array->set_length(length + 1);
return array;
}
// Not enough space in the array left, either grow, shrink or
// compact the array.
int new_length = array->CountLiveElements() + 1;
bool shrink = new_length < length / 4;
bool grow = 3 * (length / 4) < new_length;
if (shrink || grow) {
// Grow or shrink array and compact out-of-place.
int new_capacity = CapacityForLength(new_length);
array = isolate->factory()->CompactWeakArrayList(array, new_capacity,
allocation);
} else {
// Perform compaction in the current array.
array->Compact(isolate);
}
// Now append value to the array, there should always be enough space now.
DCHECK_LT(array->length(), array->capacity());
// Reload length, allocation might have killed some weak refs.
int index = array->length();
array->Set(index, *value);
array->set_length(index + 1);
return array;
}
void WeakArrayList::Compact(Isolate* isolate) {
int length = this->length();
int new_length = 0;
for (int i = 0; i < length; i++) {
MaybeObject value = Get(isolate, i);
if (!value->IsCleared()) {
if (new_length != i) {
Set(new_length, value);
}
++new_length;
}
}
set_length(new_length);
}
bool WeakArrayList::IsFull() { return length() == capacity(); }
// static
Handle<WeakArrayList> WeakArrayList::EnsureSpace(Isolate* isolate,
Handle<WeakArrayList> array,
int length,
AllocationType allocation) {
int capacity = array->capacity();
if (capacity < length) {
int grow_by = CapacityForLength(length) - capacity;
array = isolate->factory()->CopyWeakArrayListAndGrow(array, grow_by,
allocation);
}
return array;
}
int WeakArrayList::CountLiveWeakReferences() const {
int live_weak_references = 0;
for (int i = 0; i < length(); i++) {
if (Get(i)->IsWeak()) {
++live_weak_references;
}
}
return live_weak_references;
}
int WeakArrayList::CountLiveElements() const {
int non_cleared_objects = 0;
for (int i = 0; i < length(); i++) {
if (!Get(i)->IsCleared()) {
++non_cleared_objects;
}
}
return non_cleared_objects;
}
bool WeakArrayList::RemoveOne(const MaybeObjectHandle& value) {
if (length() == 0) return false;
// Optimize for the most recently added element to be removed again.
MaybeObject cleared_weak_ref =
HeapObjectReference::ClearedValue(GetIsolate());
int last_index = length() - 1;
for (int i = last_index; i >= 0; --i) {
if (Get(i) == *value) {
// Move the last element into the this slot (or no-op, if this is the
// last slot).
Set(i, Get(last_index));
Set(last_index, cleared_weak_ref);
set_length(last_index);
return true;
}
}
return false;
}
// static
Handle<WeakArrayList> PrototypeUsers::Add(Isolate* isolate,
Handle<WeakArrayList> array,
Handle<Map> value,
int* assigned_index) {
int length = array->length();
if (length == 0) {
// Uninitialized WeakArrayList; need to initialize empty_slot_index.
array = WeakArrayList::EnsureSpace(isolate, array, kFirstIndex + 1);
set_empty_slot_index(*array, kNoEmptySlotsMarker);
array->Set(kFirstIndex, HeapObjectReference::Weak(*value));
array->set_length(kFirstIndex + 1);
if (assigned_index != nullptr) *assigned_index = kFirstIndex;
return array;
}
// If the array has unfilled space at the end, use it.
if (!array->IsFull()) {
array->Set(length, HeapObjectReference::Weak(*value));
array->set_length(length + 1);
if (assigned_index != nullptr) *assigned_index = length;
return array;
}
// If there are empty slots, use one of them.
int empty_slot = Smi::ToInt(empty_slot_index(*array));
if (empty_slot == kNoEmptySlotsMarker) {
// GCs might have cleared some references, rescan the array for empty slots.
PrototypeUsers::ScanForEmptySlots(*array);
empty_slot = Smi::ToInt(empty_slot_index(*array));
}
if (empty_slot != kNoEmptySlotsMarker) {
DCHECK_GE(empty_slot, kFirstIndex);
CHECK_LT(empty_slot, array->length());
int next_empty_slot = array->Get(empty_slot).ToSmi().value();
array->Set(empty_slot, HeapObjectReference::Weak(*value));
if (assigned_index != nullptr) *assigned_index = empty_slot;
set_empty_slot_index(*array, next_empty_slot);
return array;
} else {
DCHECK_EQ(empty_slot, kNoEmptySlotsMarker);
}
// Array full and no empty slots. Grow the array.
array = WeakArrayList::EnsureSpace(isolate, array, length + 1);
array->Set(length, HeapObjectReference::Weak(*value));
array->set_length(length + 1);
if (assigned_index != nullptr) *assigned_index = length;
return array;
}
// static
void PrototypeUsers::ScanForEmptySlots(WeakArrayList array) {
for (int i = kFirstIndex; i < array.length(); i++) {
if (array.Get(i)->IsCleared()) {
PrototypeUsers::MarkSlotEmpty(array, i);
}
}
}
WeakArrayList PrototypeUsers::Compact(Handle<WeakArrayList> array, Heap* heap,
CompactionCallback callback,
AllocationType allocation) {
if (array->length() == 0) {
return *array;
}
int new_length = kFirstIndex + array->CountLiveWeakReferences();
if (new_length == array->length()) {
return *array;
}
Handle<WeakArrayList> new_array = WeakArrayList::EnsureSpace(
heap->isolate(),
handle(ReadOnlyRoots(heap).empty_weak_array_list(), heap->isolate()),
new_length, allocation);
// Allocation might have caused GC and turned some of the elements into
// cleared weak heap objects. Count the number of live objects again.
int copy_to = kFirstIndex;
for (int i = kFirstIndex; i < array->length(); i++) {
MaybeObject element = array->Get(i);
HeapObject value;
if (element->GetHeapObjectIfWeak(&value)) {
callback(value, i, copy_to);
new_array->Set(copy_to++, element);
} else {
DCHECK(element->IsCleared() || element->IsSmi());
}
}
new_array->set_length(copy_to);
set_empty_slot_index(*new_array, kNoEmptySlotsMarker);
return *new_array;
}
Handle<RegExpMatchInfo> RegExpMatchInfo::New(Isolate* isolate,
int capture_count) {
Handle<RegExpMatchInfo> match_info = isolate->factory()->NewRegExpMatchInfo();
return ReserveCaptures(isolate, match_info, capture_count);
}
Handle<RegExpMatchInfo> RegExpMatchInfo::ReserveCaptures(
Isolate* isolate, Handle<RegExpMatchInfo> match_info, int capture_count) {
DCHECK_GE(match_info->length(), kLastMatchOverhead);
int capture_register_count =
JSRegExp::RegistersForCaptureCount(capture_count);
const int required_length = kFirstCaptureIndex + capture_register_count;
Handle<RegExpMatchInfo> result = Handle<RegExpMatchInfo>::cast(
EnsureSpaceInFixedArray(isolate, match_info, required_length));
result->SetNumberOfCaptureRegisters(capture_register_count);
return result;
}
// static
Handle<FrameArray> FrameArray::AppendJSFrame(Handle<FrameArray> in,
Handle<Object> receiver,
Handle<JSFunction> function,
Handle<AbstractCode> code,
int offset, int flags,
Handle<FixedArray> parameters) {
const int frame_count = in->FrameCount();
const int new_length = LengthFor(frame_count + 1);
Handle<FrameArray> array =
EnsureSpace(function->GetIsolate(), in, new_length);
array->SetReceiver(frame_count, *receiver);
array->SetFunction(frame_count, *function);
array->SetCode(frame_count, *code);
array->SetOffset(frame_count, Smi::FromInt(offset));
array->SetFlags(frame_count, Smi::FromInt(flags));
array->SetParameters(frame_count, *parameters);
array->set(kFrameCountIndex, Smi::FromInt(frame_count + 1));
return array;
}
// static
Handle<FrameArray> FrameArray::AppendWasmFrame(
Handle<FrameArray> in, Handle<WasmInstanceObject> wasm_instance,
int wasm_function_index, wasm::WasmCode* code, int offset, int flags) {
// This must be either a compiled or interpreted wasm frame, or an asm.js
// frame (which is always compiled).
DCHECK_EQ(1,
((flags & kIsWasmFrame) != 0) + ((flags & kIsAsmJsWasmFrame) != 0));
Isolate* isolate = wasm_instance->GetIsolate();
const int frame_count = in->FrameCount();
const int new_length = LengthFor(frame_count + 1);
Handle<FrameArray> array = EnsureSpace(isolate, in, new_length);
// The {code} will be {nullptr} for interpreted wasm frames.
Handle<Object> code_ref = isolate->factory()->undefined_value();
if (code) {
auto native_module = wasm_instance->module_object().shared_native_module();
code_ref = Managed<wasm::GlobalWasmCodeRef>::Allocate(
isolate, 0, code, std::move(native_module));
}
array->SetWasmInstance(frame_count, *wasm_instance);
array->SetWasmFunctionIndex(frame_count, Smi::FromInt(wasm_function_index));
array->SetWasmCodeObject(frame_count, *code_ref);
array->SetOffset(frame_count, Smi::FromInt(offset));
array->SetFlags(frame_count, Smi::FromInt(flags));
array->set(kFrameCountIndex, Smi::FromInt(frame_count + 1));
return array;
}
void FrameArray::ShrinkToFit(Isolate* isolate) {
Shrink(isolate, LengthFor(FrameCount()));
}
// static
Handle<FrameArray> FrameArray::EnsureSpace(Isolate* isolate,
Handle<FrameArray> array,
int length) {
return Handle<FrameArray>::cast(
EnsureSpaceInFixedArray(isolate, array, length));
}
template <typename LocalIsolate>
Handle<DescriptorArray> DescriptorArray::Allocate(LocalIsolate* isolate,
int nof_descriptors,
int slack,
AllocationType allocation) {
return nof_descriptors + slack == 0
? isolate->factory()->empty_descriptor_array()
: isolate->factory()->NewDescriptorArray(nof_descriptors, slack,
allocation);
}
template Handle<DescriptorArray> DescriptorArray::Allocate(
Isolate* isolate, int nof_descriptors, int slack,
AllocationType allocation);
template Handle<DescriptorArray> DescriptorArray::Allocate(
LocalIsolate* isolate, int nof_descriptors, int slack,
AllocationType allocation);
void DescriptorArray::Initialize(EnumCache enum_cache,
HeapObject undefined_value,
int nof_descriptors, int slack) {
DCHECK_GE(nof_descriptors, 0);
DCHECK_GE(slack, 0);
DCHECK_LE(nof_descriptors + slack, kMaxNumberOfDescriptors);
set_number_of_all_descriptors(nof_descriptors + slack);
set_number_of_descriptors(nof_descriptors);
set_raw_number_of_marked_descriptors(0);
set_filler16bits(0);
set_enum_cache(enum_cache);
MemsetTagged(GetDescriptorSlot(0), undefined_value,
number_of_all_descriptors() * kEntrySize);
}
void DescriptorArray::ClearEnumCache() {
set_enum_cache(GetReadOnlyRoots().empty_enum_cache());
}
void DescriptorArray::Replace(InternalIndex index, Descriptor* descriptor) {
descriptor->SetSortedKeyIndex(GetSortedKeyIndex(index.as_int()));
Set(index, descriptor);
}
// static
void DescriptorArray::InitializeOrChangeEnumCache(
Handle<DescriptorArray> descriptors, Isolate* isolate,
Handle<FixedArray> keys, Handle<FixedArray> indices) {
EnumCache enum_cache = descriptors->enum_cache();
if (enum_cache == ReadOnlyRoots(isolate).empty_enum_cache()) {
enum_cache = *isolate->factory()->NewEnumCache(keys, indices);
descriptors->set_enum_cache(enum_cache);
} else {
enum_cache.set_keys(*keys);
enum_cache.set_indices(*indices);
}
}
void DescriptorArray::CopyFrom(InternalIndex index, DescriptorArray src) {
PropertyDetails details = src.GetDetails(index);
Set(index, src.GetKey(index), src.GetValue(index), details);
}
void DescriptorArray::Sort() {
// In-place heap sort.
int len = number_of_descriptors();
// Reset sorting since the descriptor array might contain invalid pointers.
for (int i = 0; i < len; ++i) SetSortedKey(i, i);
// Bottom-up max-heap construction.
// Index of the last node with children.
const int max_parent_index = (len / 2) - 1;
for (int i = max_parent_index; i >= 0; --i) {
int parent_index = i;
const uint32_t parent_hash = GetSortedKey(i).hash();
while (parent_index <= max_parent_index) {
int child_index = 2 * parent_index + 1;
uint32_t child_hash = GetSortedKey(child_index).hash();
if (child_index + 1 < len) {
uint32_t right_child_hash = GetSortedKey(child_index + 1).hash();
if (right_child_hash > child_hash) {
child_index++;
child_hash = right_child_hash;
}
}
if (child_hash <= parent_hash) break;
SwapSortedKeys(parent_index, child_index);
// Now element at child_index could be < its children.
parent_index = child_index; // parent_hash remains correct.
}
}
// Extract elements and create sorted array.
for (int i = len - 1; i > 0; --i) {
// Put max element at the back of the array.
SwapSortedKeys(0, i);
// Shift down the new top element.
int parent_index = 0;
const uint32_t parent_hash = GetSortedKey(parent_index).hash();
const int max_parent_index = (i / 2) - 1;
while (parent_index <= max_parent_index) {
int child_index = parent_index * 2 + 1;
uint32_t child_hash = GetSortedKey(child_index).hash();
if (child_index + 1 < i) {
uint32_t right_child_hash = GetSortedKey(child_index + 1).hash();
if (right_child_hash > child_hash) {
child_index++;
child_hash = right_child_hash;
}
}
if (child_hash <= parent_hash) break;
SwapSortedKeys(parent_index, child_index);
parent_index = child_index;
}
}
DCHECK(IsSortedNoDuplicates());
}
int16_t DescriptorArray::UpdateNumberOfMarkedDescriptors(
unsigned mark_compact_epoch, int16_t new_marked) {
STATIC_ASSERT(kMaxNumberOfDescriptors <=
NumberOfMarkedDescriptors::kMaxNumberOfMarkedDescriptors);
int16_t old_raw_marked = raw_number_of_marked_descriptors();
int16_t old_marked =
NumberOfMarkedDescriptors::decode(mark_compact_epoch, old_raw_marked);
int16_t new_raw_marked =
NumberOfMarkedDescriptors::encode(mark_compact_epoch, new_marked);
while (old_marked < new_marked) {
int16_t actual_raw_marked = CompareAndSwapRawNumberOfMarkedDescriptors(
old_raw_marked, new_raw_marked);
if (actual_raw_marked == old_raw_marked) {
break;
}
old_raw_marked = actual_raw_marked;
old_marked =
NumberOfMarkedDescriptors::decode(mark_compact_epoch, old_raw_marked);
}
return old_marked;
}
Handle<AccessorPair> AccessorPair::Copy(Isolate* isolate,
Handle<AccessorPair> pair) {
Handle<AccessorPair> copy = isolate->factory()->NewAccessorPair();
copy->set_getter(pair->getter());
copy->set_setter(pair->setter());
return copy;
}
Handle<Object> AccessorPair::GetComponent(Isolate* isolate,
Handle<NativeContext> native_context,
Handle<AccessorPair> accessor_pair,
AccessorComponent component) {
Object accessor = accessor_pair->get(component);
if (accessor.IsFunctionTemplateInfo()) {
return ApiNatives::InstantiateFunction(
isolate, native_context,
handle(FunctionTemplateInfo::cast(accessor), isolate))
.ToHandleChecked();
}
if (accessor.IsNull(isolate)) {
return isolate->factory()->undefined_value();
}
return handle(accessor, isolate);
}
#ifdef DEBUG
bool DescriptorArray::IsEqualTo(DescriptorArray other) {
if (number_of_all_descriptors() != other.number_of_all_descriptors()) {
return false;
}
for (InternalIndex i : InternalIndex::Range(number_of_descriptors())) {
if (GetKey(i) != other.GetKey(i)) return false;
if (GetDetails(i).AsSmi() != other.GetDetails(i).AsSmi()) return false;
if (GetValue(i) != other.GetValue(i)) return false;
}
return true;
}
#endif
// static
MaybeHandle<String> Name::ToFunctionName(Isolate* isolate, Handle<Name> name) {
if (name->IsString()) return Handle<String>::cast(name);
// ES6 section 9.2.11 SetFunctionName, step 4.
Handle<Object> description(Handle<Symbol>::cast(name)->description(),
isolate);
if (description->IsUndefined(isolate)) {
return isolate->factory()->empty_string();
}
IncrementalStringBuilder builder(isolate);
builder.AppendCharacter('[');
builder.AppendString(Handle<String>::cast(description));
builder.AppendCharacter(']');
return builder.Finish();
}
// static
MaybeHandle<String> Name::ToFunctionName(Isolate* isolate, Handle<Name> name,
Handle<String> prefix) {
Handle<String> name_string;
ASSIGN_RETURN_ON_EXCEPTION(isolate, name_string,
ToFunctionName(isolate, name), String);
IncrementalStringBuilder builder(isolate);
builder.AppendString(prefix);
builder.AppendCharacter(' ');
builder.AppendString(name_string);
return builder.Finish();
}
void Relocatable::PostGarbageCollectionProcessing(Isolate* isolate) {
Relocatable* current = isolate->relocatable_top();
while (current != nullptr) {
current->PostGarbageCollection();
current = current->prev_;
}
}
// Reserve space for statics needing saving and restoring.
int Relocatable::ArchiveSpacePerThread() {
return sizeof(Relocatable*); // NOLINT
}
// Archive statics that are thread-local.
char* Relocatable::ArchiveState(Isolate* isolate, char* to) {
*reinterpret_cast<Relocatable**>(to) = isolate->relocatable_top();
isolate->set_relocatable_top(nullptr);
return to + ArchiveSpacePerThread();
}
// Restore statics that are thread-local.
char* Relocatable::RestoreState(Isolate* isolate, char* from) {
isolate->set_relocatable_top(*reinterpret_cast<Relocatable**>(from));
return from + ArchiveSpacePerThread();
}
char* Relocatable::Iterate(RootVisitor* v, char* thread_storage) {
Relocatable* top = *reinterpret_cast<Relocatable**>(thread_storage);
Iterate(v, top);
return thread_storage + ArchiveSpacePerThread();
}
void Relocatable::Iterate(Isolate* isolate, RootVisitor* v) {
Iterate(v, isolate->relocatable_top());
}
void Relocatable::Iterate(RootVisitor* v, Relocatable* top) {
Relocatable* current = top;
while (current != nullptr) {
current->IterateInstance(v);
current = current->prev_;
}
}
namespace {
template <typename sinkchar>
void WriteFixedArrayToFlat(FixedArray fixed_array, int length, String separator,
sinkchar* sink, int sink_length) {
DisallowHeapAllocation no_allocation;
CHECK_GT(length, 0);
CHECK_LE(length, fixed_array.length());
#ifdef DEBUG
sinkchar* sink_end = sink + sink_length;
#endif
const int separator_length = separator.length();
const bool use_one_byte_separator_fast_path =
separator_length == 1 && sizeof(sinkchar) == 1 &&
StringShape(separator).IsSequentialOneByte();
uint8_t separator_one_char;
if (use_one_byte_separator_fast_path) {
CHECK(StringShape(separator).IsSequentialOneByte());
CHECK_EQ(separator.length(), 1);
separator_one_char =
SeqOneByteString::cast(separator).GetChars(no_allocation)[0];
}
uint32_t num_separators = 0;
for (int i = 0; i < length; i++) {
Object element = fixed_array.get(i);
const bool element_is_separator_sequence = element.IsSmi();
// If element is a Smi, it represents the number of separators to write.
if (V8_UNLIKELY(element_is_separator_sequence)) {
CHECK(element.ToUint32(&num_separators));
// Verify that Smis (number of separators) only occur when necessary:
// 1) at the beginning
// 2) at the end
// 3) when the number of separators > 1
// - It is assumed that consecutive Strings will have one separator,
// so there is no need for a Smi.
DCHECK(i == 0 || i == length - 1 || num_separators > 1);
}
// Write separator(s) if necessary.
if (num_separators > 0 && separator_length > 0) {
// TODO(pwong): Consider doubling strategy employed by runtime-strings.cc
// WriteRepeatToFlat().
// Fast path for single character, single byte separators.
if (use_one_byte_separator_fast_path) {
DCHECK_LE(sink + num_separators, sink_end);
memset(sink, separator_one_char, num_separators);
DCHECK_EQ(separator_length, 1);
sink += num_separators;
} else {
for (uint32_t j = 0; j < num_separators; j++) {
DCHECK_LE(sink + separator_length, sink_end);
String::WriteToFlat(separator, sink, 0, separator_length);
sink += separator_length;
}
}
}
if (V8_UNLIKELY(element_is_separator_sequence)) {
num_separators = 0;
} else {
DCHECK(element.IsString());
String string = String::cast(element);
const int string_length = string.length();
DCHECK(string_length == 0 || sink < sink_end);
String::WriteToFlat(string, sink, 0, string_length);
sink += string_length;
// Next string element, needs at least one separator preceding it.
num_separators = 1;
}
}
// Verify we have written to the end of the sink.
DCHECK_EQ(sink, sink_end);
}
} // namespace
// static
Address JSArray::ArrayJoinConcatToSequentialString(Isolate* isolate,
Address raw_fixed_array,
intptr_t length,
Address raw_separator,
Address raw_dest) {
DisallowHeapAllocation no_allocation;
DisallowJavascriptExecution no_js(isolate);
FixedArray fixed_array = FixedArray::cast(Object(raw_fixed_array));
String separator = String::cast(Object(raw_separator));
String dest = String::cast(Object(raw_dest));
DCHECK(fixed_array.IsFixedArray());
DCHECK(StringShape(dest).IsSequentialOneByte() ||
StringShape(dest).IsSequentialTwoByte());
if (StringShape(dest).IsSequentialOneByte()) {
WriteFixedArrayToFlat(fixed_array, static_cast<int>(length), separator,
SeqOneByteString::cast(dest).GetChars(no_allocation),
dest.length());
} else {
DCHECK(StringShape(dest).IsSequentialTwoByte());
WriteFixedArrayToFlat(fixed_array, static_cast<int>(length), separator,
SeqTwoByteString::cast(dest).GetChars(no_allocation),
dest.length());
}
return dest.ptr();
}
uint32_t StringHasher::MakeArrayIndexHash(uint32_t value, int length) {
// For array indexes mix the length into the hash as an array index could
// be zero.
DCHECK_GT(length, 0);
DCHECK_LE(length, String::kMaxArrayIndexSize);
DCHECK(TenToThe(String::kMaxCachedArrayIndexLength) <
(1 << String::kArrayIndexValueBits));
value <<= String::ArrayIndexValueBits::kShift;
value |= length << String::ArrayIndexLengthBits::kShift;
DCHECK_EQ(value & String::kIsNotIntegerIndexMask, 0);
DCHECK_EQ(length <= String::kMaxCachedArrayIndexLength,
Name::ContainsCachedArrayIndex(value));
return value;
}
Handle<Object> CacheInitialJSArrayMaps(Isolate* isolate,
Handle<Context> native_context,
Handle<Map> initial_map) {
// Replace all of the cached initial array maps in the native context with
// the appropriate transitioned elements kind maps.
Handle<Map> current_map = initial_map;
ElementsKind kind = current_map->elements_kind();
DCHECK_EQ(GetInitialFastElementsKind(), kind);
native_context->set(Context::ArrayMapIndex(kind), *current_map);
for (int i = GetSequenceIndexFromFastElementsKind(kind) + 1;
i < kFastElementsKindCount; ++i) {
Handle<Map> new_map;
ElementsKind next_kind = GetFastElementsKindFromSequenceIndex(i);
Map maybe_elements_transition = current_map->ElementsTransitionMap(isolate);
if (!maybe_elements_transition.is_null()) {
new_map = handle(maybe_elements_transition, isolate);
} else {
new_map = Map::CopyAsElementsKind(isolate, current_map, next_kind,
INSERT_TRANSITION);
}
DCHECK_EQ(next_kind, new_map->elements_kind());
native_context->set(Context::ArrayMapIndex(next_kind), *new_map);
current_map = new_map;
}
return initial_map;
}
STATIC_ASSERT_FIELD_OFFSETS_EQUAL(HeapNumber::kValueOffset,
Oddball::kToNumberRawOffset);
void Oddball::Initialize(Isolate* isolate, Handle<Oddball> oddball,
const char* to_string, Handle<Object> to_number,
const char* type_of, byte kind) {
Handle<String> internalized_to_string =
isolate->factory()->InternalizeUtf8String(to_string);
Handle<String> internalized_type_of =
isolate->factory()->InternalizeUtf8String(type_of);
if (to_number->IsHeapNumber()) {
oddball->set_to_number_raw_as_bits(
Handle<HeapNumber>::cast(to_number)->value_as_bits());
} else {
oddball->set_to_number_raw(to_number->Number());
}
oddball->set_to_number(*to_number);
oddball->set_to_string(*internalized_to_string);
oddball->set_type_of(*internalized_type_of);
oddball->set_kind(kind);
}
// static
int Script::GetEvalPosition(Isolate* isolate, Handle<Script> script) {
DCHECK(script->compilation_type() == Script::COMPILATION_TYPE_EVAL);
int position = script->eval_from_position();
if (position < 0) {
// Due to laziness, the position may not have been translated from code
// offset yet, which would be encoded as negative integer. In that case,
// translate and set the position.
if (!script->has_eval_from_shared()) {
position = 0;
} else {
Handle<SharedFunctionInfo> shared =
handle(script->eval_from_shared(), isolate);
SharedFunctionInfo::EnsureSourcePositionsAvailable(isolate, shared);
position = shared->abstract_code().SourcePosition(-position);
}
DCHECK_GE(position, 0);
script->set_eval_from_position(position);
}
return position;
}
template <typename LocalIsolate>
// static
void Script::InitLineEnds(LocalIsolate* isolate, Handle<Script> script) {
if (!script->line_ends().IsUndefined(isolate)) return;
DCHECK(script->type() != Script::TYPE_WASM ||
script->source_mapping_url().IsString());
Object src_obj = script->source();
if (!src_obj.IsString()) {
DCHECK(src_obj.IsUndefined(isolate));
script->set_line_ends(ReadOnlyRoots(isolate).empty_fixed_array());
} else {
DCHECK(src_obj.IsString());
Handle<String> src(String::cast(src_obj), isolate);
Handle<FixedArray> array = String::CalculateLineEnds(isolate, src, true);
script->set_line_ends(*array);
}
DCHECK(script->line_ends().IsFixedArray());
}
template EXPORT_TEMPLATE_DEFINE(V8_EXPORT_PRIVATE) void Script::InitLineEnds(
Isolate* isolate, Handle<Script> script);
template EXPORT_TEMPLATE_DEFINE(V8_EXPORT_PRIVATE) void Script::InitLineEnds(
LocalIsolate* isolate, Handle<Script> script);
bool Script::GetPositionInfo(Handle<Script> script, int position,
PositionInfo* info, OffsetFlag offset_flag) {
// For wasm, we do not create an artificial line_ends array, but do the
// translation directly.
if (script->type() != Script::TYPE_WASM)
InitLineEnds(script->GetIsolate(), script);
return script->GetPositionInfo(position, info, offset_flag);
}
bool Script::IsUserJavaScript() const { return type() == Script::TYPE_NORMAL; }
bool Script::ContainsAsmModule() {
DisallowHeapAllocation no_gc;
SharedFunctionInfo::ScriptIterator iter(this->GetIsolate(), *this);
for (SharedFunctionInfo info = iter.Next(); !info.is_null();
info = iter.Next()) {
if (info.HasAsmWasmData()) return true;
}
return false;
}
namespace {
template <typename Char>
bool GetPositionInfoSlowImpl(const Vector<Char>& source, int position,
Script::PositionInfo* info) {
if (position < 0) {
position = 0;
}
int line = 0;
const auto begin = std::cbegin(source);
const auto end = std::cend(source);
for (auto line_begin = begin; line_begin < end;) {
const auto line_end = std::find(line_begin, end, '\n');
if (position <= (line_end - begin)) {
info->line = line;
info->column = static_cast<int>((begin + position) - line_begin);
info->line_start = static_cast<int>(line_begin - begin);
info->line_end = static_cast<int>(line_end - begin);
return true;
}
++line;
line_begin = line_end + 1;
}
return false;
}
bool GetPositionInfoSlow(const Script script, int position,
const DisallowHeapAllocation& no_gc,
Script::PositionInfo* info) {
if (!script.source().IsString()) {
return false;
}
auto source = String::cast(script.source());
const auto flat = source.GetFlatContent(no_gc);
return flat.IsOneByte()
? GetPositionInfoSlowImpl(flat.ToOneByteVector(), position, info)
: GetPositionInfoSlowImpl(flat.ToUC16Vector(), position, info);
}
} // namespace
bool Script::GetPositionInfo(int position, PositionInfo* info,
OffsetFlag offset_flag) const {
DisallowHeapAllocation no_allocation;
// For wasm, we use the byte offset as the column.
if (type() == Script::TYPE_WASM) {
DCHECK_LE(0, position);
wasm::NativeModule* native_module = wasm_native_module();
const wasm::WasmModule* module = native_module->module();
if (module->functions.size() == 0) return false;
info->line = 0;
info->column = position;
info->line_start = module->functions[0].code.offset();
info->line_end = module->functions.back().code.end_offset();
return true;
}
if (line_ends().IsUndefined()) {
// Slow mode: we do not have line_ends. We have to iterate through source.
if (!GetPositionInfoSlow(*this, position, no_allocation, info)) {
return false;
}
} else {
DCHECK(line_ends().IsFixedArray());
FixedArray ends = FixedArray::cast(line_ends());
const int ends_len = ends.length();
if (ends_len == 0) return false;
// Return early on invalid positions. Negative positions behave as if 0 was
// passed, and positions beyond the end of the script return as failure.
if (position < 0) {
position = 0;
} else if (position > Smi::ToInt(ends.get(ends_len - 1))) {
return false;
}
// Determine line number by doing a binary search on the line ends array.
if (Smi::ToInt(ends.get(0)) >= position) {
info->line = 0;
info->line_start = 0;
info->column = position;
} else {
int left = 0;
int right = ends_len - 1;
while (right > 0) {
DCHECK_LE(left, right);
const int mid = (left + right) / 2;
if (position > Smi::ToInt(ends.get(mid))) {
left = mid + 1;
} else if (position <= Smi::ToInt(ends.get(mid - 1))) {
right = mid - 1;
} else {
info->line = mid;
break;
}
}
DCHECK(Smi::ToInt(ends.get(info->line)) >= position &&
Smi::ToInt(ends.get(info->line - 1)) < position);
info->line_start = Smi::ToInt(ends.get(info->line - 1)) + 1;
info->column = position - info->line_start;
}
// Line end is position of the linebreak character.
info->line_end = Smi::ToInt(ends.get(info->line));
if (info->line_end > 0) {
DCHECK(source().IsString());
String src = String::cast(source());
if (src.length() >= info->line_end &&
src.Get(info->line_end - 1) == '\r') {
info->line_end--;
}
}
}
// Add offsets if requested.
if (offset_flag == WITH_OFFSET) {
if (info->line == 0) {
info->column += column_offset();
}
info->line += line_offset();
}
return true;
}
int Script::GetColumnNumber(Handle<Script> script, int code_pos) {
PositionInfo info;
GetPositionInfo(script, code_pos, &info, WITH_OFFSET);
return info.column;
}
int Script::GetColumnNumber(int code_pos) const {
PositionInfo info;
GetPositionInfo(code_pos, &info, WITH_OFFSET);
return info.column;
}
int Script::GetLineNumber(Handle<Script> script, int code_pos) {
PositionInfo info;
GetPositionInfo(script, code_pos, &info, WITH_OFFSET);
return info.line;
}
int Script::GetLineNumber(int code_pos) const {
PositionInfo info;
GetPositionInfo(code_pos, &info, WITH_OFFSET);
return info.line;
}
Object Script::GetNameOrSourceURL() {
// Keep in sync with ScriptNameOrSourceURL in messages.js.
if (!source_url().IsUndefined()) return source_url();
return name();
}
template <typename LocalIsolate>
MaybeHandle<SharedFunctionInfo> Script::FindSharedFunctionInfo(
LocalIsolate* isolate, int function_literal_id) {
CHECK_NE(function_literal_id, kFunctionLiteralIdInvalid);
// If this check fails, the problem is most probably the function id
// renumbering done by AstFunctionLiteralIdReindexer; in particular, that
// AstTraversalVisitor doesn't recurse properly in the construct which
// triggers the mismatch.
CHECK_LT(function_literal_id, shared_function_infos().length());
MaybeObject shared = shared_function_infos().Get(function_literal_id);
HeapObject heap_object;
if (!shared->GetHeapObject(&heap_object) ||
heap_object.IsUndefined(isolate)) {
return MaybeHandle<SharedFunctionInfo>();
}
return handle(SharedFunctionInfo::cast(heap_object), isolate);
}
template MaybeHandle<SharedFunctionInfo> Script::FindSharedFunctionInfo(
Isolate* isolate, int function_literal_id);
template MaybeHandle<SharedFunctionInfo> Script::FindSharedFunctionInfo(
LocalIsolate* isolate, int function_literal_id);
Script::Iterator::Iterator(Isolate* isolate)
: iterator_(isolate->heap()->script_list()) {}
Script Script::Iterator::Next() {
Object o = iterator_.Next();
if (o != Object()) {
return Script::cast(o);
}
return Script();
}
// static
void JSArray::Initialize(Handle<JSArray> array, int capacity, int length) {
DCHECK_GE(capacity, 0);
array->GetIsolate()->factory()->NewJSArrayStorage(
array, length, capacity, INITIALIZE_ARRAY_ELEMENTS_WITH_HOLE);
}
void JSArray::SetLength(Handle<JSArray> array, uint32_t new_length) {
// We should never end in here with a pixel or external array.
DCHECK(array->AllowsSetLength());
if (array->SetLengthWouldNormalize(new_length)) {
JSObject::NormalizeElements(array);
}
array->GetElementsAccessor()->SetLength(array, new_length);
}
// ES6: 9.5.2 [[SetPrototypeOf]] (V)
// static
Maybe<bool> JSProxy::SetPrototype(Handle<JSProxy> proxy, Handle<Object> value,
bool from_javascript,
ShouldThrow should_throw) {
Isolate* isolate = proxy->GetIsolate();
STACK_CHECK(isolate, Nothing<bool>());
Handle<Name> trap_name = isolate->factory()->setPrototypeOf_string();
// 1. Assert: Either Type(V) is Object or Type(V) is Null.
DCHECK(value->IsJSReceiver() || value->IsNull(isolate));
// 2. Let handler be the value of the [[ProxyHandler]] internal slot of O.
Handle<Object> handler(proxy->handler(), isolate);
// 3. If handler is null, throw a TypeError exception.
// 4. Assert: Type(handler) is Object.
if (proxy->IsRevoked()) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyRevoked, trap_name));
return Nothing<bool>();
}
// 5. Let target be the value of the [[ProxyTarget]] internal slot.
Handle<JSReceiver> target(JSReceiver::cast(proxy->target()), isolate);
// 6. Let trap be ? GetMethod(handler, "getPrototypeOf").
Handle<Object> trap;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap,
Object::GetMethod(Handle<JSReceiver>::cast(handler), trap_name),
Nothing<bool>());
// 7. If trap is undefined, then return target.[[SetPrototypeOf]]().
if (trap->IsUndefined(isolate)) {
return JSReceiver::SetPrototype(target, value, from_javascript,
should_throw);
}
// 8. Let booleanTrapResult be ToBoolean(? Call(trap, handler, «target, V»)).
Handle<Object> argv[] = {target, value};
Handle<Object> trap_result;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap_result,
Execution::Call(isolate, trap, handler, arraysize(argv), argv),
Nothing<bool>());
bool bool_trap_result = trap_result->BooleanValue(isolate);
// 9. If booleanTrapResult is false, return false.
if (!bool_trap_result) {
RETURN_FAILURE(
isolate, should_throw,
NewTypeError(MessageTemplate::kProxyTrapReturnedFalsish, trap_name));
}
// 10. Let extensibleTarget be ? IsExtensible(target).
Maybe<bool> is_extensible = JSReceiver::IsExtensible(target);
if (is_extensible.IsNothing()) return Nothing<bool>();
// 11. If extensibleTarget is true, return true.
if (is_extensible.FromJust()) {
if (bool_trap_result) return Just(true);
RETURN_FAILURE(
isolate, should_throw,
NewTypeError(MessageTemplate::kProxyTrapReturnedFalsish, trap_name));
}
// 12. Let targetProto be ? target.[[GetPrototypeOf]]().
Handle<Object> target_proto;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(isolate, target_proto,
JSReceiver::GetPrototype(isolate, target),
Nothing<bool>());
// 13. If SameValue(V, targetProto) is false, throw a TypeError exception.
if (bool_trap_result && !value->SameValue(*target_proto)) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxySetPrototypeOfNonExtensible));
return Nothing<bool>();
}
// 14. Return true.
return Just(true);
}
bool JSArray::SetLengthWouldNormalize(uint32_t new_length) {
if (!HasFastElements()) return false;
uint32_t capacity = static_cast<uint32_t>(elements().length());
uint32_t new_capacity;
return JSArray::SetLengthWouldNormalize(GetHeap(), new_length) &&
ShouldConvertToSlowElements(*this, capacity, new_length - 1,
&new_capacity);
}
const double AllocationSite::kPretenureRatio = 0.85;
void AllocationSite::ResetPretenureDecision() {
set_pretenure_decision(kUndecided);
set_memento_found_count(0);
set_memento_create_count(0);
}
AllocationType AllocationSite::GetAllocationType() const {
PretenureDecision mode = pretenure_decision();
// Zombie objects "decide" to be untenured.
return mode == kTenure ? AllocationType::kOld : AllocationType::kYoung;
}
bool AllocationSite::IsNested() {
DCHECK(FLAG_trace_track_allocation_sites);
Object current = boilerplate().GetHeap()->allocation_sites_list();
while (current.IsAllocationSite()) {
AllocationSite current_site = AllocationSite::cast(current);
if (current_site.nested_site() == *this) {
return true;
}
current = current_site.weak_next();
}
return false;
}
bool AllocationSite::ShouldTrack(ElementsKind from, ElementsKind to) {
return IsMoreGeneralElementsKindTransition(from, to);
}
const char* AllocationSite::PretenureDecisionName(PretenureDecision decision) {
switch (decision) {
case kUndecided:
return "undecided";
case kDontTenure:
return "don't tenure";
case kMaybeTenure:
return "maybe tenure";
case kTenure:
return "tenure";
case kZombie:
return "zombie";
default:
UNREACHABLE();
}
return nullptr;
}
// static
bool JSArray::MayHaveReadOnlyLength(Map js_array_map) {
DCHECK(js_array_map.IsJSArrayMap());
if (js_array_map.is_dictionary_map()) return true;
// Fast path: "length" is the first fast property of arrays with non
// dictionary properties. Since it's not configurable, it's guaranteed to be
// the first in the descriptor array.
InternalIndex first(0);
DCHECK(js_array_map.instance_descriptors(kRelaxedLoad).GetKey(first) ==
js_array_map.GetReadOnlyRoots().length_string());
return js_array_map.instance_descriptors(kRelaxedLoad)
.GetDetails(first)
.IsReadOnly();
}
bool JSArray::HasReadOnlyLength(Handle<JSArray> array) {
Map map = array->map();
// If map guarantees that there can't be a read-only length, we are done.
if (!MayHaveReadOnlyLength(map)) return false;
// Look at the object.
Isolate* isolate = array->GetIsolate();
LookupIterator it(isolate, array, isolate->factory()->length_string(), array,
LookupIterator::OWN_SKIP_INTERCEPTOR);
CHECK_EQ(LookupIterator::ACCESSOR, it.state());
return it.IsReadOnly();
}
bool JSArray::WouldChangeReadOnlyLength(Handle<JSArray> array, uint32_t index) {
uint32_t length = 0;
CHECK(array->length().ToArrayLength(&length));
if (length <= index) return HasReadOnlyLength(array);
return false;
}
// Certain compilers request function template instantiation when they
// see the definition of the other template functions in the
// class. This requires us to have the template functions put
// together, so even though this function belongs in objects-debug.cc,
// we keep it here instead to satisfy certain compilers.
#ifdef OBJECT_PRINT
template <typename Derived, typename Shape>
void Dictionary<Derived, Shape>::Print(std::ostream& os) {
DisallowHeapAllocation no_gc;
IsolateRoot isolate = GetIsolateForPtrCompr(*this);
ReadOnlyRoots roots = this->GetReadOnlyRoots(isolate);
Derived dictionary = Derived::cast(*this);
for (InternalIndex i : dictionary.IterateEntries()) {
Object k = dictionary.KeyAt(isolate, i);
if (!dictionary.ToKey(roots, i, &k)) continue;
os << "\n ";
if (k.IsString()) {
String::cast(k).PrintUC16(os);
} else {
os << Brief(k);
}
os << ": " << Brief(dictionary.ValueAt(i)) << " ";
dictionary.DetailsAt(i).PrintAsSlowTo(os);
}
}
template <typename Derived, typename Shape>
void Dictionary<Derived, Shape>::Print() {
StdoutStream os;
Print(os);
os << std::endl;
}
#endif
int FixedArrayBase::GetMaxLengthForNewSpaceAllocation(ElementsKind kind) {
return ((kMaxRegularHeapObjectSize - FixedArrayBase::kHeaderSize) >>
ElementsKindToShiftSize(kind));
}
bool FixedArrayBase::IsCowArray() const {
return map() == GetReadOnlyRoots().fixed_cow_array_map();
}
const char* Symbol::PrivateSymbolToName() const {
ReadOnlyRoots roots = GetReadOnlyRoots();
#define SYMBOL_CHECK_AND_PRINT(_, name) \
if (*this == roots.name()) return #name;
PRIVATE_SYMBOL_LIST_GENERATOR(SYMBOL_CHECK_AND_PRINT, /* not used */)
#undef SYMBOL_CHECK_AND_PRINT
return "UNKNOWN";
}
void Symbol::SymbolShortPrint(std::ostream& os) {
os << "<Symbol:";
if (!description().IsUndefined()) {
os << " ";
String description_as_string = String::cast(description());
description_as_string.PrintUC16(os, 0, description_as_string.length());
} else {
os << " (" << PrivateSymbolToName() << ")";
}
os << ">";
}
v8::Promise::PromiseState JSPromise::status() const {
int value = flags() & StatusBits::kMask;
DCHECK(value == 0 || value == 1 || value == 2);
return static_cast<v8::Promise::PromiseState>(value);
}
void JSPromise::set_status(Promise::PromiseState status) {
int value = flags() & ~StatusBits::kMask;
set_flags(value | status);
}
// static
const char* JSPromise::Status(v8::Promise::PromiseState status) {
switch (status) {
case v8::Promise::kFulfilled:
return "fulfilled";
case v8::Promise::kPending:
return "pending";
case v8::Promise::kRejected:
return "rejected";
}
UNREACHABLE();
}
int JSPromise::async_task_id() const {
return AsyncTaskIdBits::decode(flags());
}
void JSPromise::set_async_task_id(int id) {
set_flags(AsyncTaskIdBits::update(flags(), id));
}
// static
Handle<Object> JSPromise::Fulfill(Handle<JSPromise> promise,
Handle<Object> value) {
Isolate* const isolate = promise->GetIsolate();
// 1. Assert: The value of promise.[[PromiseState]] is "pending".
CHECK_EQ(Promise::kPending, promise->status());
// 2. Let reactions be promise.[[PromiseFulfillReactions]].
Handle<Object> reactions(promise->reactions(), isolate);
// 3. Set promise.[[PromiseResult]] to value.
// 4. Set promise.[[PromiseFulfillReactions]] to undefined.
// 5. Set promise.[[PromiseRejectReactions]] to undefined.
promise->set_reactions_or_result(*value);
// 6. Set promise.[[PromiseState]] to "fulfilled".
promise->set_status(Promise::kFulfilled);
// 7. Return TriggerPromiseReactions(reactions, value).
return TriggerPromiseReactions(isolate, reactions, value,
PromiseReaction::kFulfill);
}
static void MoveMessageToPromise(Isolate* isolate, Handle<JSPromise> promise) {
if (isolate->thread_local_top()->pending_message_obj_.IsTheHole(isolate)) {
return;
}
Handle<Object> message =
handle(isolate->thread_local_top()->pending_message_obj_, isolate);
Handle<Symbol> key = isolate->factory()->promise_debug_message_symbol();
Object::SetProperty(isolate, promise, key, message, StoreOrigin::kMaybeKeyed,
Just(ShouldThrow::kThrowOnError))
.Assert();
// The message object for a rejected promise was only stored for this purpose.
// Clear it, otherwise we might leak memory.
isolate->clear_pending_message();
}
// static
Handle<Object> JSPromise::Reject(Handle<JSPromise> promise,
Handle<Object> reason, bool debug_event) {
Isolate* const isolate = promise->GetIsolate();
DCHECK(
!reinterpret_cast<v8::Isolate*>(isolate)->GetCurrentContext().IsEmpty());
if (isolate->debug()->is_active()) MoveMessageToPromise(isolate, promise);
if (debug_event) isolate->debug()->OnPromiseReject(promise, reason);
isolate->RunPromiseHook(PromiseHookType::kResolve, promise,
isolate->factory()->undefined_value());
// 1. Assert: The value of promise.[[PromiseState]] is "pending".
CHECK_EQ(Promise::kPending, promise->status());
// 2. Let reactions be promise.[[PromiseRejectReactions]].
Handle<Object> reactions(promise->reactions(), isolate);
// 3. Set promise.[[PromiseResult]] to reason.
// 4. Set promise.[[PromiseFulfillReactions]] to undefined.
// 5. Set promise.[[PromiseRejectReactions]] to undefined.
promise->set_reactions_or_result(*reason);
// 6. Set promise.[[PromiseState]] to "rejected".
promise->set_status(Promise::kRejected);
// 7. If promise.[[PromiseIsHandled]] is false, perform
// HostPromiseRejectionTracker(promise, "reject").
if (!promise->has_handler()) {
isolate->ReportPromiseReject(promise, reason, kPromiseRejectWithNoHandler);
}
// 8. Return TriggerPromiseReactions(reactions, reason).
return TriggerPromiseReactions(isolate, reactions, reason,
PromiseReaction::kReject);
}
// https://tc39.es/ecma262/#sec-promise-resolve-functions
// static
MaybeHandle<Object> JSPromise::Resolve(Handle<JSPromise> promise,
Handle<Object> resolution) {
Isolate* const isolate = promise->GetIsolate();
DCHECK(
!reinterpret_cast<v8::Isolate*>(isolate)->GetCurrentContext().IsEmpty());
isolate->RunPromiseHook(PromiseHookType::kResolve, promise,
isolate->factory()->undefined_value());
// 7. If SameValue(resolution, promise) is true, then
if (promise.is_identical_to(resolution)) {
// a. Let selfResolutionError be a newly created TypeError object.
Handle<Object> self_resolution_error = isolate->factory()->NewTypeError(
MessageTemplate::kPromiseCyclic, resolution);
// b. Return RejectPromise(promise, selfResolutionError).
return Reject(promise, self_resolution_error);
}
// 8. If Type(resolution) is not Object, then
if (!resolution->IsJSReceiver()) {
// a. Return FulfillPromise(promise, resolution).
return Fulfill(promise, resolution);
}
// 9. Let then be Get(resolution, "then").
MaybeHandle<Object> then;
Handle<JSReceiver> receiver(Handle<JSReceiver>::cast(resolution));
// Make sure a lookup of "then" on any JSPromise whose [[Prototype]] is the
// initial %PromisePrototype% yields the initial method. In addition this
// protector also guards the negative lookup of "then" on the intrinsic
// %ObjectPrototype%, meaning that such lookups are guaranteed to yield
// undefined without triggering any side-effects.
if (receiver->IsJSPromise() &&
isolate->IsInAnyContext(receiver->map().prototype(),
Context::PROMISE_PROTOTYPE_INDEX) &&
Protectors::IsPromiseThenLookupChainIntact(isolate)) {
// We can skip the "then" lookup on {resolution} if its [[Prototype]]
// is the (initial) Promise.prototype and the Promise#then protector
// is intact, as that guards the lookup path for the "then" property
// on JSPromise instances which have the (initial) %PromisePrototype%.
then = isolate->promise_then();
} else {
then = JSReceiver::GetProperty(isolate, receiver,
isolate->factory()->then_string());
}
// 10. If then is an abrupt completion, then
Handle<Object> then_action;
if (!then.ToHandle(&then_action)) {
// The "then" lookup can cause termination.
if (!isolate->is_catchable_by_javascript(isolate->pending_exception())) {
return kNullMaybeHandle;
}
// a. Return RejectPromise(promise, then.[[Value]]).
Handle<Object> reason(isolate->pending_exception(), isolate);
isolate->clear_pending_exception();
return Reject(promise, reason, false);
}
// 11. Let thenAction be then.[[Value]].
// 12. If IsCallable(thenAction) is false, then
if (!then_action->IsCallable()) {
// a. Return FulfillPromise(promise, resolution).
return Fulfill(promise, resolution);
}
// 13. Let job be NewPromiseResolveThenableJob(promise, resolution,
// thenAction).
Handle<NativeContext> then_context;
if (!JSReceiver::GetContextForMicrotask(Handle<JSReceiver>::cast(then_action))
.ToHandle(&then_context)) {
then_context = isolate->native_context();
}
Handle<PromiseResolveThenableJobTask> task =
isolate->factory()->NewPromiseResolveThenableJobTask(
promise, Handle<JSReceiver>::cast(resolution),
Handle<JSReceiver>::cast(then_action), then_context);
if (isolate->debug()->is_active() && resolution->IsJSPromise()) {
// Mark the dependency of the new {promise} on the {resolution}.
Object::SetProperty(isolate, resolution,
isolate->factory()->promise_handled_by_symbol(),
promise)
.Check();
}
MicrotaskQueue* microtask_queue = then_context->microtask_queue();
if (microtask_queue) microtask_queue->EnqueueMicrotask(*task);
// 15. Return undefined.
return isolate->factory()->undefined_value();
}
// static
Handle<Object> JSPromise::TriggerPromiseReactions(Isolate* isolate,
Handle<Object> reactions,
Handle<Object> argument,
PromiseReaction::Type type) {
CHECK(reactions->IsSmi() || reactions->IsPromiseReaction());
// We need to reverse the {reactions} here, since we record them
// on the JSPromise in the reverse order.
{
DisallowHeapAllocation no_gc;
Object current = *reactions;
Object reversed = Smi::zero();
while (!current.IsSmi()) {
Object next = PromiseReaction::cast(current).next();
PromiseReaction::cast(current).set_next(reversed);
reversed = current;
current = next;
}
reactions = handle(reversed, isolate);
}
// Morph the {reactions} into PromiseReactionJobTasks
// and push them onto the microtask queue.
while (!reactions->IsSmi()) {
Handle<HeapObject> task = Handle<HeapObject>::cast(reactions);
Handle<PromiseReaction> reaction = Handle<PromiseReaction>::cast(task);
reactions = handle(reaction->next(), isolate);
// According to HTML, we use the context of the appropriate handler as the
// context of the microtask. See step 3 of HTML's EnqueueJob:
// https://html.spec.whatwg.org/C/#enqueuejob(queuename,-job,-arguments)
Handle<NativeContext> handler_context;
Handle<HeapObject> primary_handler;
Handle<HeapObject> secondary_handler;
if (type == PromiseReaction::kFulfill) {
primary_handler = handle(reaction->fulfill_handler(), isolate);
secondary_handler = handle(reaction->reject_handler(), isolate);
} else {
primary_handler = handle(reaction->reject_handler(), isolate);
secondary_handler = handle(reaction->fulfill_handler(), isolate);
}
bool has_handler_context = false;
if (primary_handler->IsJSReceiver()) {
has_handler_context = JSReceiver::GetContextForMicrotask(
Handle<JSReceiver>::cast(primary_handler))
.ToHandle(&handler_context);
}
if (!has_handler_context && secondary_handler->IsJSReceiver()) {
has_handler_context = JSReceiver::GetContextForMicrotask(
Handle<JSReceiver>::cast(secondary_handler))
.ToHandle(&handler_context);
}
if (!has_handler_context) handler_context = isolate->native_context();
STATIC_ASSERT(
static_cast<int>(PromiseReaction::kSize) ==
static_cast<int>(
PromiseReactionJobTask::kSizeOfAllPromiseReactionJobTasks));
if (type == PromiseReaction::kFulfill) {
task->synchronized_set_map(
ReadOnlyRoots(isolate).promise_fulfill_reaction_job_task_map());
Handle<PromiseFulfillReactionJobTask>::cast(task)->set_argument(
*argument);
Handle<PromiseFulfillReactionJobTask>::cast(task)->set_context(
*handler_context);
STATIC_ASSERT(
static_cast<int>(PromiseReaction::kFulfillHandlerOffset) ==
static_cast<int>(PromiseFulfillReactionJobTask::kHandlerOffset));
STATIC_ASSERT(
static_cast<int>(PromiseReaction::kPromiseOrCapabilityOffset) ==
static_cast<int>(
PromiseFulfillReactionJobTask::kPromiseOrCapabilityOffset));
STATIC_ASSERT(
static_cast<int>(
PromiseReaction::kContinuationPreservedEmbedderDataOffset) ==
static_cast<int>(PromiseFulfillReactionJobTask::
kContinuationPreservedEmbedderDataOffset));
} else {
DisallowHeapAllocation no_gc;
task->synchronized_set_map(
ReadOnlyRoots(isolate).promise_reject_reaction_job_task_map());
Handle<PromiseRejectReactionJobTask>::cast(task)->set_argument(*argument);
Handle<PromiseRejectReactionJobTask>::cast(task)->set_context(
*handler_context);
Handle<PromiseRejectReactionJobTask>::cast(task)->set_handler(
*primary_handler);
STATIC_ASSERT(
static_cast<int>(PromiseReaction::kPromiseOrCapabilityOffset) ==
static_cast<int>(
PromiseRejectReactionJobTask::kPromiseOrCapabilityOffset));
STATIC_ASSERT(
static_cast<int>(
PromiseReaction::kContinuationPreservedEmbedderDataOffset) ==
static_cast<int>(PromiseRejectReactionJobTask::
kContinuationPreservedEmbedderDataOffset));
}
MicrotaskQueue* microtask_queue = handler_context->microtask_queue();
if (microtask_queue) {
microtask_queue->EnqueueMicrotask(
*Handle<PromiseReactionJobTask>::cast(task));
}
}
return isolate->factory()->undefined_value();
}
template <typename Derived, typename Shape>
void HashTable<Derived, Shape>::IteratePrefix(ObjectVisitor* v) {
BodyDescriptorBase::IteratePointers(*this, 0, kElementsStartOffset, v);
}
template <typename Derived, typename Shape>
void HashTable<Derived, Shape>::IterateElements(ObjectVisitor* v) {
BodyDescriptorBase::IteratePointers(*this, kElementsStartOffset,
SizeFor(length()), v);
}
template <typename Derived, typename Shape>
template <typename LocalIsolate>
Handle<Derived> HashTable<Derived, Shape>::New(
LocalIsolate* isolate, int at_least_space_for, AllocationType allocation,
MinimumCapacity capacity_option) {
DCHECK_LE(0, at_least_space_for);
DCHECK_IMPLIES(capacity_option == USE_CUSTOM_MINIMUM_CAPACITY,
base::bits::IsPowerOfTwo(at_least_space_for));
int capacity = (capacity_option == USE_CUSTOM_MINIMUM_CAPACITY)
? at_least_space_for
: ComputeCapacity(at_least_space_for);
if (capacity > HashTable::kMaxCapacity) {
isolate->FatalProcessOutOfHeapMemory("invalid table size");
}
return NewInternal(isolate, capacity, allocation);
}
template <typename Derived, typename Shape>
template <typename LocalIsolate>
Handle<Derived> HashTable<Derived, Shape>::NewInternal(
LocalIsolate* isolate, int capacity, AllocationType allocation) {
auto* factory = isolate->factory();
int length = EntryToIndex(InternalIndex(capacity));
Handle<FixedArray> array = factory->NewFixedArrayWithMap(
Derived::GetMap(ReadOnlyRoots(isolate)), length, allocation);
Handle<Derived> table = Handle<Derived>::cast(array);
table->SetNumberOfElements(0);
table->SetNumberOfDeletedElements(0);
table->SetCapacity(capacity);
return table;
}
template <typename Derived, typename Shape>
void HashTable<Derived, Shape>::Rehash(IsolateRoot isolate, Derived new_table) {
DisallowHeapAllocation no_gc;
WriteBarrierMode mode = new_table.GetWriteBarrierMode(no_gc);
DCHECK_LT(NumberOfElements(), new_table.Capacity());
// Copy prefix to new array.
for (int i = kPrefixStartIndex; i < kElementsStartIndex; i++) {
new_table.set(i, get(isolate, i), mode);
}
// Rehash the elements.
ReadOnlyRoots roots = GetReadOnlyRoots(isolate);
for (InternalIndex i : this->IterateEntries()) {
uint32_t from_index = EntryToIndex(i);
Object k = this->get(isolate, from_index);
if (!IsKey(roots, k)) continue;
uint32_t hash = Shape::HashForObject(roots, k);
uint32_t insertion_index =
EntryToIndex(new_table.FindInsertionEntry(isolate, roots, hash));
new_table.set_key(insertion_index, get(isolate, from_index), mode);
for (int j = 1; j < Shape::kEntrySize; j++) {
new_table.set(insertion_index + j, get(isolate, from_index + j), mode);
}
}
new_table.SetNumberOfElements(NumberOfElements());
new_table.SetNumberOfDeletedElements(0);
}
template <typename Derived, typename Shape>
InternalIndex HashTable<Derived, Shape>::EntryForProbe(ReadOnlyRoots roots,
Object k, int probe,
InternalIndex expected) {
uint32_t hash = Shape::HashForObject(roots, k);
uint32_t capacity = this->Capacity();
InternalIndex entry = FirstProbe(hash, capacity);
for (int i = 1; i < probe; i++) {
if (entry == expected) return expected;
entry = NextProbe(entry, i, capacity);
}
return entry;
}
template <typename Derived, typename Shape>
void HashTable<Derived, Shape>::Swap(InternalIndex entry1, InternalIndex entry2,
WriteBarrierMode mode) {
int index1 = EntryToIndex(entry1);
int index2 = EntryToIndex(entry2);
Object temp[Shape::kEntrySize];
Derived* self = static_cast<Derived*>(this);
for (int j = 0; j < Shape::kEntrySize; j++) {
temp[j] = get(index1 + j);
}
self->set_key(index1, get(index2), mode);
for (int j = 1; j < Shape::kEntrySize; j++) {
set(index1 + j, get(index2 + j), mode);
}
self->set_key(index2, temp[0], mode);
for (int j = 1; j < Shape::kEntrySize; j++) {
set(index2 + j, temp[j], mode);
}
}
template <typename Derived, typename Shape>
void HashTable<Derived, Shape>::Rehash(IsolateRoot isolate) {
DisallowHeapAllocation no_gc;
WriteBarrierMode mode = GetWriteBarrierMode(no_gc);
ReadOnlyRoots roots = GetReadOnlyRoots(isolate);
uint32_t capacity = Capacity();
bool done = false;
for (int probe = 1; !done; probe++) {
// All elements at entries given by one of the first _probe_ probes
// are placed correctly. Other elements might need to be moved.
done = true;
for (InternalIndex current(0); current.raw_value() < capacity;
/* {current} is advanced manually below, when appropriate.*/) {
Object current_key = KeyAt(isolate, current);
if (!IsKey(roots, current_key)) {
++current; // Advance to next entry.
continue;
}
InternalIndex target = EntryForProbe(roots, current_key, probe, current);
if (current == target) {
++current; // Advance to next entry.
continue;
}
Object target_key = KeyAt(isolate, target);
if (!IsKey(roots, target_key) ||
EntryForProbe(roots, target_key, probe, target) != target) {
// Put the current element into the correct position.
Swap(current, target, mode);
// The other element will be processed on the next iteration,
// so don't advance {current} here!
} else {
// The place for the current element is occupied. Leave the element
// for the next probe.
done = false;
++current; // Advance to next entry.
}
}
}
// Wipe deleted entries.
Object the_hole = roots.the_hole_value();
HeapObject undefined = roots.undefined_value();
Derived* self = static_cast<Derived*>(this);
for (InternalIndex current : InternalIndex::Range(capacity)) {
if (KeyAt(isolate, current) == the_hole) {
self->set_key(EntryToIndex(current) + kEntryKeyIndex, undefined,
SKIP_WRITE_BARRIER);
}
}
SetNumberOfDeletedElements(0);
}
template <typename Derived, typename Shape>
template <typename LocalIsolate>
Handle<Derived> HashTable<Derived, Shape>::EnsureCapacity(
LocalIsolate* isolate, Handle<Derived> table, int n,
AllocationType allocation) {
if (table->HasSufficientCapacityToAdd(n)) return table;
int capacity = table->Capacity();
int new_nof = table->NumberOfElements() + n;
bool should_pretenure = allocation == AllocationType::kOld ||
((capacity > kMinCapacityForPretenure) &&
!Heap::InYoungGeneration(*table));
Handle<Derived> new_table = HashTable::New(
isolate, new_nof,
should_pretenure ? AllocationType::kOld : AllocationType::kYoung);
table->Rehash(isolate, *new_table);
return new_table;
}
template <typename Derived, typename Shape>
bool HashTable<Derived, Shape>::HasSufficientCapacityToAdd(
int number_of_additional_elements) {
return HasSufficientCapacityToAdd(Capacity(), NumberOfElements(),
NumberOfDeletedElements(),
number_of_additional_elements);
}
// static
template <typename Derived, typename Shape>
bool HashTable<Derived, Shape>::HasSufficientCapacityToAdd(
int capacity, int number_of_elements, int number_of_deleted_elements,
int number_of_additional_elements) {
int nof = number_of_elements + number_of_additional_elements;
// Return true if:
// 50% is still free after adding number_of_additional_elements elements and
// at most 50% of the free elements are deleted elements.
if ((nof < capacity) &&
((number_of_deleted_elements <= (capacity - nof) / 2))) {
int needed_free = nof / 2;
if (nof + needed_free <= capacity) return true;
}
return false;
}
// static
template <typename Derived, typename Shape>
int HashTable<Derived, Shape>::ComputeCapacityWithShrink(
int current_capacity, int at_least_room_for) {
// Shrink to fit the number of elements if only a quarter of the
// capacity is filled with elements.
if (at_least_room_for > (current_capacity / 4)) return current_capacity;
// Recalculate the smaller capacity actually needed.
int new_capacity = ComputeCapacity(at_least_room_for);
DCHECK_GE(new_capacity, at_least_room_for);
// Don't go lower than room for {kMinShrinkCapacity} elements.
if (new_capacity < Derived::kMinShrinkCapacity) return current_capacity;
return new_capacity;
}
// static
template <typename Derived, typename Shape>
Handle<Derived> HashTable<Derived, Shape>::Shrink(Isolate* isolate,
Handle<Derived> table,
int additional_capacity) {
int new_capacity = ComputeCapacityWithShrink(
table->Capacity(), table->NumberOfElements() + additional_capacity);
if (new_capacity == table->Capacity()) return table;
DCHECK_GE(new_capacity, Derived::kMinShrinkCapacity);
bool pretenure = (new_capacity > kMinCapacityForPretenure) &&
!Heap::InYoungGeneration(*table);
Handle<Derived> new_table =
HashTable::New(isolate, new_capacity,
pretenure ? AllocationType::kOld : AllocationType::kYoung,
USE_CUSTOM_MINIMUM_CAPACITY);
table->Rehash(isolate, *new_table);
return new_table;
}
template <typename Derived, typename Shape>
InternalIndex HashTable<Derived, Shape>::FindInsertionEntry(IsolateRoot isolate,
ReadOnlyRoots roots,
uint32_t hash) {
uint32_t capacity = Capacity();
uint32_t count = 1;
// EnsureCapacity will guarantee the hash table is never full.
for (InternalIndex entry = FirstProbe(hash, capacity);;
entry = NextProbe(entry, count++, capacity)) {
if (!IsKey(roots, KeyAt(isolate, entry))) return entry;
}
}
template <typename Derived, typename Shape>
InternalIndex HashTable<Derived, Shape>::FindInsertionEntry(Isolate* isolate,
uint32_t hash) {
return FindInsertionEntry(isolate, ReadOnlyRoots(isolate), hash);
}
Handle<StringSet> StringSet::New(Isolate* isolate) {
return HashTable::New(isolate, 0);
}
Handle<StringSet> StringSet::Add(Isolate* isolate, Handle<StringSet> stringset,
Handle<String> name) {
if (!stringset->Has(isolate, name)) {
stringset = EnsureCapacity(isolate, stringset);
uint32_t hash = ShapeT::Hash(ReadOnlyRoots(isolate), *name);
InternalIndex entry = stringset->FindInsertionEntry(isolate, hash);
stringset->set(EntryToIndex(entry), *name);
stringset->ElementAdded();
}
return stringset;
}
bool StringSet::Has(Isolate* isolate, Handle<String> name) {
return FindEntry(isolate, *name).is_found();
}
Handle<ObjectHashSet> ObjectHashSet::Add(Isolate* isolate,
Handle<ObjectHashSet> set,
Handle<Object> key) {
int32_t hash = key->GetOrCreateHash(isolate).value();
if (!set->Has(isolate, key, hash)) {
set = EnsureCapacity(isolate, set);
InternalIndex entry = set->FindInsertionEntry(isolate, hash);
set->set(EntryToIndex(entry), *key);
set->ElementAdded();
}
return set;
}
template <typename Derived, typename Shape>
template <typename LocalIsolate>
Handle<Derived> BaseNameDictionary<Derived, Shape>::New(
LocalIsolate* isolate, int at_least_space_for, AllocationType allocation,
MinimumCapacity capacity_option) {
DCHECK_LE(0, at_least_space_for);
Handle<Derived> dict = Dictionary<Derived, Shape>::New(
isolate, at_least_space_for, allocation, capacity_option);
dict->SetHash(PropertyArray::kNoHashSentinel);
dict->set_next_enumeration_index(PropertyDetails::kInitialIndex);
return dict;
}
template <typename Derived, typename Shape>
int BaseNameDictionary<Derived, Shape>::NextEnumerationIndex(
Isolate* isolate, Handle<Derived> dictionary) {
int index = dictionary->next_enumeration_index();
// Check whether the next enumeration index is valid.
if (!PropertyDetails::IsValidIndex(index)) {
// If not, we generate new indices for the properties.
Handle<FixedArray> iteration_order = IterationIndices(isolate, dictionary);
int length = iteration_order->length();
DCHECK_LE(length, dictionary->NumberOfElements());
// Iterate over the dictionary using the enumeration order and update
// the dictionary with new enumeration indices.
for (int i = 0; i < length; i++) {
InternalIndex index(Smi::ToInt(iteration_order->get(i)));
DCHECK(dictionary->IsKey(dictionary->GetReadOnlyRoots(),
dictionary->KeyAt(isolate, index)));
int enum_index = PropertyDetails::kInitialIndex + i;
PropertyDetails details = dictionary->DetailsAt(index);
PropertyDetails new_details = details.set_index(enum_index);
dictionary->DetailsAtPut(index, new_details);
}
index = PropertyDetails::kInitialIndex + length;
}
// Don't update the next enumeration index here, since we might be looking at
// an immutable empty dictionary.
return index;
}
template <typename Derived, typename Shape>
Handle<Derived> Dictionary<Derived, Shape>::DeleteEntry(
Isolate* isolate, Handle<Derived> dictionary, InternalIndex entry) {
DCHECK(Shape::kEntrySize != 3 ||
dictionary->DetailsAt(entry).IsConfigurable());
dictionary->ClearEntry(entry);
dictionary->ElementRemoved();
return Shrink(isolate, dictionary);
}
template <typename Derived, typename Shape>
Handle<Derived> Dictionary<Derived, Shape>::AtPut(Isolate* isolate,
Handle<Derived> dictionary,
Key key, Handle<Object> value,
PropertyDetails details) {
InternalIndex entry = dictionary->FindEntry(isolate, key);
// If the entry is present set the value;
if (entry.is_not_found()) {
return Derived::Add(isolate, dictionary, key, value, details);
}
// We don't need to copy over the enumeration index.
dictionary->ValueAtPut(entry, *value);
if (Shape::kEntrySize == 3) dictionary->DetailsAtPut(entry, details);
return dictionary;
}
template <typename Derived, typename Shape>
template <typename LocalIsolate>
Handle<Derived>
BaseNameDictionary<Derived, Shape>::AddNoUpdateNextEnumerationIndex(
LocalIsolate* isolate, Handle<Derived> dictionary, Key key,
Handle<Object> value, PropertyDetails details, InternalIndex* entry_out) {
// Insert element at empty or deleted entry.
return Dictionary<Derived, Shape>::Add(isolate, dictionary, key, value,
details, entry_out);
}
template <typename Derived, typename Shape>
Handle<Derived> BaseNameDictionary<Derived, Shape>::Add(
Isolate* isolate, Handle<Derived> dictionary, Key key, Handle<Object> value,
PropertyDetails details, InternalIndex* entry_out) {
// Insert element at empty or deleted entry
DCHECK_EQ(0, details.dictionary_index());
// Assign an enumeration index to the property and update
// SetNextEnumerationIndex.
int index = Derived::NextEnumerationIndex(isolate, dictionary);
details = details.set_index(index);
dictionary = AddNoUpdateNextEnumerationIndex(isolate, dictionary, key, value,
details, entry_out);
// Update enumeration index here in order to avoid potential modification of
// the canonical empty dictionary which lives in read only space.
dictionary->set_next_enumeration_index(index + 1);
return dictionary;
}
template <typename Derived, typename Shape>
template <typename LocalIsolate>
Handle<Derived> Dictionary<Derived, Shape>::Add(LocalIsolate* isolate,
Handle<Derived> dictionary,
Key key, Handle<Object> value,
PropertyDetails details,
InternalIndex* entry_out) {
ReadOnlyRoots roots(isolate);
uint32_t hash = Shape::Hash(roots, key);
// Validate that the key is absent.
SLOW_DCHECK(dictionary->FindEntry(isolate, key).is_not_found());
// Check whether the dictionary should be extended.
dictionary = Derived::EnsureCapacity(isolate, dictionary);
// Compute the key object.
Handle<Object> k = Shape::AsHandle(isolate, key);
InternalIndex entry = dictionary->FindInsertionEntry(isolate, roots, hash);
dictionary->SetEntry(entry, *k, *value, details);
DCHECK(dictionary->KeyAt(isolate, entry).IsNumber() ||
Shape::Unwrap(dictionary->KeyAt(isolate, entry)).IsUniqueName());
dictionary->ElementAdded();
if (entry_out) *entry_out = entry;
return dictionary;
}
// static
Handle<SimpleNumberDictionary> SimpleNumberDictionary::Set(
Isolate* isolate, Handle<SimpleNumberDictionary> dictionary, uint32_t key,
Handle<Object> value) {
return AtPut(isolate, dictionary, key, value, PropertyDetails::Empty());
}
void NumberDictionary::UpdateMaxNumberKey(uint32_t key,
Handle<JSObject> dictionary_holder) {
DisallowHeapAllocation no_allocation;
// If the dictionary requires slow elements an element has already
// been added at a high index.
if (requires_slow_elements()) return;
// Check if this index is high enough that we should require slow
// elements.
if (key > kRequiresSlowElementsLimit) {
if (!dictionary_holder.is_null()) {
dictionary_holder->RequireSlowElements(*this);
}
set_requires_slow_elements();
return;
}
// Update max key value.
Object max_index_object = get(kMaxNumberKeyIndex);
if (!max_index_object.IsSmi() || max_number_key() < key) {
FixedArray::set(kMaxNumberKeyIndex,
Smi::FromInt(key << kRequiresSlowElementsTagSize));
}
}
Handle<NumberDictionary> NumberDictionary::Set(
Isolate* isolate, Handle<NumberDictionary> dictionary, uint32_t key,
Handle<Object> value, Handle<JSObject> dictionary_holder,
PropertyDetails details) {
// We could call Set with empty dictionaries. UpdateMaxNumberKey doesn't
// expect empty dictionaries so make sure to call AtPut that correctly handles
// them by creating new dictionary when required.
Handle<NumberDictionary> new_dictionary =
AtPut(isolate, dictionary, key, value, details);
new_dictionary->UpdateMaxNumberKey(key, dictionary_holder);
return new_dictionary;
}
void NumberDictionary::CopyValuesTo(FixedArray elements) {
ReadOnlyRoots roots = GetReadOnlyRoots();
int pos = 0;
DisallowHeapAllocation no_gc;
WriteBarrierMode mode = elements.GetWriteBarrierMode(no_gc);
for (InternalIndex i : this->IterateEntries()) {
Object k;
if (this->ToKey(roots, i, &k)) {
elements.set(pos++, this->ValueAt(i), mode);
}
}
DCHECK_EQ(pos, elements.length());
}
template <typename Derived, typename Shape>
int Dictionary<Derived, Shape>::NumberOfEnumerableProperties() {
ReadOnlyRoots roots = this->GetReadOnlyRoots();
int result = 0;
for (InternalIndex i : this->IterateEntries()) {
Object k;
if (!this->ToKey(roots, i, &k)) continue;
if (k.FilterKey(ENUMERABLE_STRINGS)) continue;
PropertyDetails details = this->DetailsAt(i);
PropertyAttributes attr = details.attributes();
if ((attr & ONLY_ENUMERABLE) == 0) result++;
}
return result;
}
template <typename Derived, typename Shape>
Handle<FixedArray> BaseNameDictionary<Derived, Shape>::IterationIndices(
Isolate* isolate, Handle<Derived> dictionary) {
Handle<FixedArray> array =
isolate->factory()->NewFixedArray(dictionary->NumberOfElements());
ReadOnlyRoots roots(isolate);
int array_size = 0;
{
DisallowHeapAllocation no_gc;
Derived raw_dictionary = *dictionary;
for (InternalIndex i : dictionary->IterateEntries()) {
Object k;
if (!raw_dictionary.ToKey(roots, i, &k)) continue;
array->set(array_size++, Smi::FromInt(i.as_int()));
}
// The global dictionary doesn't track its deletion count, so we may iterate
// fewer entries than the count of elements claimed by the dictionary.
if (std::is_same<Derived, GlobalDictionary>::value) {
DCHECK_LE(array_size, dictionary->NumberOfElements());
} else {
DCHECK_EQ(array_size, dictionary->NumberOfElements());
}
EnumIndexComparator<Derived> cmp(raw_dictionary);
// Use AtomicSlot wrapper to ensure that std::sort uses atomic load and
// store operations that are safe for concurrent marking.
AtomicSlot start(array->GetFirstElementAddress());
std::sort(start, start + array_size, cmp);
}
return FixedArray::ShrinkOrEmpty(isolate, array, array_size);
}
// Backwards lookup (slow).
template <typename Derived, typename Shape>
Object Dictionary<Derived, Shape>::SlowReverseLookup(Object value) {
Derived dictionary = Derived::cast(*this);
ReadOnlyRoots roots = dictionary.GetReadOnlyRoots();
for (InternalIndex i : dictionary.IterateEntries()) {
Object k;
if (!dictionary.ToKey(roots, i, &k)) continue;
Object e = dictionary.ValueAt(i);
if (e == value) return k;
}
return roots.undefined_value();
}
template <typename Derived, typename Shape>
void ObjectHashTableBase<Derived, Shape>::FillEntriesWithHoles(
Handle<Derived> table) {
int length = table->length();
for (int i = Derived::EntryToIndex(InternalIndex(0)); i < length; i++) {
table->set_the_hole(i);
}
}
template <typename Derived, typename Shape>
Object ObjectHashTableBase<Derived, Shape>::Lookup(IsolateRoot isolate,
Handle<Object> key,
int32_t hash) {
DisallowHeapAllocation no_gc;
ReadOnlyRoots roots = this->GetReadOnlyRoots(isolate);
DCHECK(this->IsKey(roots, *key));
InternalIndex entry = this->FindEntry(isolate, roots, key, hash);
if (entry.is_not_found()) return roots.the_hole_value();
return this->get(Derived::EntryToIndex(entry) + 1);
}
template <typename Derived, typename Shape>
Object ObjectHashTableBase<Derived, Shape>::Lookup(Handle<Object> key) {
DisallowHeapAllocation no_gc;
IsolateRoot isolate = GetIsolateForPtrCompr(*this);
ReadOnlyRoots roots = this->GetReadOnlyRoots(isolate);
DCHECK(this->IsKey(roots, *key));
// If the object does not have an identity hash, it was never used as a key.
Object hash = key->GetHash();
if (hash.IsUndefined(roots)) {
return roots.the_hole_value();
}
return Lookup(isolate, key, Smi::ToInt(hash));
}
template <typename Derived, typename Shape>
Object ObjectHashTableBase<Derived, Shape>::Lookup(Handle<Object> key,
int32_t hash) {
return Lookup(GetIsolateForPtrCompr(*this), key, hash);
}
template <typename Derived, typename Shape>
Object ObjectHashTableBase<Derived, Shape>::ValueAt(InternalIndex entry) {
return this->get(EntryToValueIndex(entry));
}
template <typename Derived, typename Shape>
Handle<Derived> ObjectHashTableBase<Derived, Shape>::Put(Handle<Derived> table,
Handle<Object> key,
Handle<Object> value) {
Isolate* isolate = Heap::FromWritableHeapObject(*table)->isolate();
DCHECK(table->IsKey(ReadOnlyRoots(isolate), *key));
DCHECK(!value->IsTheHole(ReadOnlyRoots(isolate)));
// Make sure the key object has an identity hash code.
int32_t hash = key->GetOrCreateHash(isolate).value();
return ObjectHashTableBase<Derived, Shape>::Put(isolate, table, key, value,
hash);
}
template <typename Derived, typename Shape>
Handle<Derived> ObjectHashTableBase<Derived, Shape>::Put(Isolate* isolate,
Handle<Derived> table,
Handle<Object> key,
Handle<Object> value,
int32_t hash) {
ReadOnlyRoots roots(isolate);
DCHECK(table->IsKey(roots, *key));
DCHECK(!value->IsTheHole(roots));
InternalIndex entry = table->FindEntry(isolate, roots, key, hash);
// Key is already in table, just overwrite value.
if (entry.is_found()) {
table->set(Derived::EntryToValueIndex(entry), *value);
return table;
}
// Rehash if more than 33% of the entries are deleted entries.
// TODO(jochen): Consider to shrink the fixed array in place.
if ((table->NumberOfDeletedElements() << 1) > table->NumberOfElements()) {
table->Rehash(isolate);
}
// If we're out of luck, we didn't get a GC recently, and so rehashing
// isn't enough to avoid a crash.
if (!table->HasSufficientCapacityToAdd(1)) {
int nof = table->NumberOfElements() + 1;
int capacity = ObjectHashTable::ComputeCapacity(nof * 2);
if (capacity > ObjectHashTable::kMaxCapacity) {
for (size_t i = 0; i < 2; ++i) {
isolate->heap()->CollectAllGarbage(
Heap::kNoGCFlags, GarbageCollectionReason::kFullHashtable);
}
table->Rehash(isolate);
}
}
// Check whether the hash table should be extended.
table = Derived::EnsureCapacity(isolate, table);
table->AddEntry(table->FindInsertionEntry(isolate, hash), *key, *value);
return table;
}
template <typename Derived, typename Shape>
Handle<Derived> ObjectHashTableBase<Derived, Shape>::Remove(
Isolate* isolate, Handle<Derived> table, Handle<Object> key,
bool* was_present) {
DCHECK(table->IsKey(table->GetReadOnlyRoots(), *key));
Object hash = key->GetHash();
if (hash.IsUndefined()) {
*was_present = false;
return table;
}
return Remove(isolate, table, key, was_present, Smi::ToInt(hash));
}
template <typename Derived, typename Shape>
Handle<Derived> ObjectHashTableBase<Derived, Shape>::Remove(
Isolate* isolate, Handle<Derived> table, Handle<Object> key,
bool* was_present, int32_t hash) {
ReadOnlyRoots roots = table->GetReadOnlyRoots();
DCHECK(table->IsKey(roots, *key));
InternalIndex entry = table->FindEntry(isolate, roots, key, hash);
if (entry.is_not_found()) {
*was_present = false;
return table;
}
*was_present = true;
table->RemoveEntry(entry);
return Derived::Shrink(isolate, table);
}
template <typename Derived, typename Shape>
void ObjectHashTableBase<Derived, Shape>::AddEntry(InternalIndex entry,
Object key, Object value) {
Derived* self = static_cast<Derived*>(this);
self->set_key(Derived::EntryToIndex(entry), key);
self->set(Derived::EntryToValueIndex(entry), value);
self->ElementAdded();
}
template <typename Derived, typename Shape>
void ObjectHashTableBase<Derived, Shape>::RemoveEntry(InternalIndex entry) {
this->set_the_hole(Derived::EntryToIndex(entry));
this->set_the_hole(Derived::EntryToValueIndex(entry));
this->ElementRemoved();
}
void JSSet::Initialize(Handle<JSSet> set, Isolate* isolate) {
Handle<OrderedHashSet> table = isolate->factory()->NewOrderedHashSet();
set->set_table(*table);
}
void JSSet::Clear(Isolate* isolate, Handle<JSSet> set) {
Handle<OrderedHashSet> table(OrderedHashSet::cast(set->table()), isolate);
table = OrderedHashSet::Clear(isolate, table);
set->set_table(*table);
}
void JSSet::Rehash(Isolate* isolate) {
Handle<OrderedHashSet> table_handle(OrderedHashSet::cast(table()), isolate);
Handle<OrderedHashSet> new_table =
OrderedHashSet::Rehash(isolate, table_handle).ToHandleChecked();
set_table(*new_table);
}
void JSMap::Initialize(Handle<JSMap> map, Isolate* isolate) {
Handle<OrderedHashMap> table = isolate->factory()->NewOrderedHashMap();
map->set_table(*table);
}
void JSMap::Clear(Isolate* isolate, Handle<JSMap> map) {
Handle<OrderedHashMap> table(OrderedHashMap::cast(map->table()), isolate);
table = OrderedHashMap::Clear(isolate, table);
map->set_table(*table);
}
void JSMap::Rehash(Isolate* isolate) {
Handle<OrderedHashMap> table_handle(OrderedHashMap::cast(table()), isolate);
Handle<OrderedHashMap> new_table =
OrderedHashMap::Rehash(isolate, table_handle).ToHandleChecked();
set_table(*new_table);
}
void JSWeakCollection::Initialize(Handle<JSWeakCollection> weak_collection,
Isolate* isolate) {
Handle<EphemeronHashTable> table = EphemeronHashTable::New(isolate, 0);
weak_collection->set_table(*table);
}
void JSWeakCollection::Set(Handle<JSWeakCollection> weak_collection,
Handle<Object> key, Handle<Object> value,
int32_t hash) {
DCHECK(key->IsJSReceiver() || key->IsSymbol());
Handle<EphemeronHashTable> table(
EphemeronHashTable::cast(weak_collection->table()),
weak_collection->GetIsolate());
DCHECK(table->IsKey(weak_collection->GetReadOnlyRoots(), *key));
Handle<EphemeronHashTable> new_table = EphemeronHashTable::Put(
weak_collection->GetIsolate(), table, key, value, hash);
weak_collection->set_table(*new_table);
if (*table != *new_table) {
// Zap the old table since we didn't record slots for its elements.
EphemeronHashTable::FillEntriesWithHoles(table);
}
}
bool JSWeakCollection::Delete(Handle<JSWeakCollection> weak_collection,
Handle<Object> key, int32_t hash) {
DCHECK(key->IsJSReceiver() || key->IsSymbol());
Handle<EphemeronHashTable> table(
EphemeronHashTable::cast(weak_collection->table()),
weak_collection->GetIsolate());
DCHECK(table->IsKey(weak_collection->GetReadOnlyRoots(), *key));
bool was_present = false;
Handle<EphemeronHashTable> new_table = EphemeronHashTable::Remove(
weak_collection->GetIsolate(), table, key, &was_present, hash);
weak_collection->set_table(*new_table);
if (*table != *new_table) {
// Zap the old table since we didn't record slots for its elements.
EphemeronHashTable::FillEntriesWithHoles(table);
}
return was_present;
}
Handle<JSArray> JSWeakCollection::GetEntries(Handle<JSWeakCollection> holder,
int max_entries) {
Isolate* isolate = holder->GetIsolate();
Handle<EphemeronHashTable> table(EphemeronHashTable::cast(holder->table()),
isolate);
if (max_entries == 0 || max_entries > table->NumberOfElements()) {
max_entries = table->NumberOfElements();
}
int values_per_entry = holder->IsJSWeakMap() ? 2 : 1;
Handle<FixedArray> entries =
isolate->factory()->NewFixedArray(max_entries * values_per_entry);
// Recompute max_values because GC could have removed elements from the table.
if (max_entries > table->NumberOfElements()) {
max_entries = table->NumberOfElements();
}
{
DisallowHeapAllocation no_gc;
ReadOnlyRoots roots = ReadOnlyRoots(isolate);
int count = 0;
for (int i = 0;
count / values_per_entry < max_entries && i < table->Capacity(); i++) {
Object key;
if (table->ToKey(roots, InternalIndex(i), &key)) {
entries->set(count++, key);
if (values_per_entry > 1) {
Object value = table->Lookup(handle(key, isolate));
entries->set(count++, value);
}
}
}
DCHECK_EQ(max_entries * values_per_entry, count);
}
return isolate->factory()->NewJSArrayWithElements(entries);
}
void PropertyCell::ClearAndInvalidate(ReadOnlyRoots roots) {
// Cell is officially mutable henceforth.
DCHECK(!value().IsTheHole(roots));
PropertyDetails details = property_details();
details = details.set_cell_type(PropertyCellType::kInvalidated);
set_value(roots.the_hole_value());
set_property_details(details);
dependent_code().DeoptimizeDependentCodeGroup(
DependentCode::kPropertyCellChangedGroup);
}
// static
Handle<PropertyCell> PropertyCell::InvalidateAndReplaceEntry(
Isolate* isolate, Handle<GlobalDictionary> dictionary,
InternalIndex entry) {
Handle<PropertyCell> cell(dictionary->CellAt(entry), isolate);
Handle<Name> name(cell->name(), isolate);
PropertyDetails details = cell->property_details();
DCHECK(details.IsConfigurable());
DCHECK(!cell->value().IsTheHole(isolate));
// Swap with a copy.
Handle<PropertyCell> new_cell = isolate->factory()->NewPropertyCell(name);
new_cell->set_value(cell->value());
// Cell is officially mutable henceforth.
details = details.set_cell_type(PropertyCellType::kMutable);
new_cell->set_property_details(details);
dictionary->ValueAtPut(entry, *new_cell);
cell->ClearAndInvalidate(ReadOnlyRoots(isolate));
return new_cell;
}
PropertyCellConstantType PropertyCell::GetConstantType() {
if (value().IsSmi()) return PropertyCellConstantType::kSmi;
return PropertyCellConstantType::kStableMap;
}
static bool RemainsConstantType(Handle<PropertyCell> cell,
Handle<Object> value) {
// TODO(dcarney): double->smi and smi->double transition from kConstant
if (cell->value().IsSmi() && value->IsSmi()) {
return true;
} else if (cell->value().IsHeapObject() && value->IsHeapObject()) {
return HeapObject::cast(cell->value()).map() ==
HeapObject::cast(*value).map() &&
HeapObject::cast(*value).map().is_stable();
}
return false;
}
// static
PropertyCellType PropertyCell::TypeForUninitializedCell(Isolate* isolate,
Handle<Object> value) {
if (value->IsUndefined(isolate)) return PropertyCellType::kUndefined;
return PropertyCellType::kConstant;
}
// static
PropertyCellType PropertyCell::UpdatedType(Isolate* isolate,
Handle<PropertyCell> cell,
Handle<Object> value,
PropertyDetails details) {
PropertyCellType type = details.cell_type();
DCHECK(!value->IsTheHole(isolate));
if (cell->value().IsTheHole(isolate)) {
switch (type) {
// Only allow a cell to transition once into constant state.
case PropertyCellType::kUninitialized:
return TypeForUninitializedCell(isolate, value);
case PropertyCellType::kInvalidated:
return PropertyCellType::kMutable;
default:
UNREACHABLE();
}
}
switch (type) {
case PropertyCellType::kUndefined:
return PropertyCellType::kConstant;
case PropertyCellType::kConstant:
if (*value == cell->value()) return PropertyCellType::kConstant;
V8_FALLTHROUGH;
case PropertyCellType::kConstantType:
if (RemainsConstantType(cell, value)) {
return PropertyCellType::kConstantType;
}
V8_FALLTHROUGH;
case PropertyCellType::kMutable:
return PropertyCellType::kMutable;
}
UNREACHABLE();
}
Handle<PropertyCell> PropertyCell::PrepareForValue(
Isolate* isolate, Handle<GlobalDictionary> dictionary, InternalIndex entry,
Handle<Object> value, PropertyDetails details) {
DCHECK(!value->IsTheHole(isolate));
Handle<PropertyCell> cell(dictionary->CellAt(entry), isolate);
const PropertyDetails original_details = cell->property_details();
// Data accesses could be cached in ics or optimized code.
bool invalidate =
original_details.kind() == kData && details.kind() == kAccessor;
int index;
PropertyCellType old_type = original_details.cell_type();
// Preserve the enumeration index unless the property was deleted or never
// initialized.
if (cell->value().IsTheHole(isolate)) {
index = GlobalDictionary::NextEnumerationIndex(isolate, dictionary);
dictionary->set_next_enumeration_index(index + 1);
} else {
index = original_details.dictionary_index();
}
DCHECK_LT(0, index);
details = details.set_index(index);
PropertyCellType new_type =
UpdatedType(isolate, cell, value, original_details);
if (invalidate) {
cell = PropertyCell::InvalidateAndReplaceEntry(isolate, dictionary, entry);
}
// Install new property details.
details = details.set_cell_type(new_type);
cell->set_property_details(details);
if (new_type == PropertyCellType::kConstant ||
new_type == PropertyCellType::kConstantType) {
// Store the value now to ensure that the cell contains the constant or
// type information. Otherwise subsequent store operation will turn
// the cell to mutable.
cell->set_value(*value);
}
// Deopt when transitioning from a constant type.
if (!invalidate && (old_type != new_type ||
original_details.IsReadOnly() != details.IsReadOnly())) {
cell->dependent_code().DeoptimizeDependentCodeGroup(
DependentCode::kPropertyCellChangedGroup);
}
return cell;
}
// static
void PropertyCell::SetValueWithInvalidation(Isolate* isolate,
const char* cell_name,
Handle<PropertyCell> cell,
Handle<Object> new_value) {
if (cell->value() != *new_value) {
cell->set_value(*new_value);
cell->dependent_code().DeoptimizeDependentCodeGroup(
DependentCode::kPropertyCellChangedGroup);
}
}
int JSGeneratorObject::source_position() const {
CHECK(is_suspended());
DCHECK(function().shared().HasBytecodeArray());
DCHECK(function().shared().GetBytecodeArray().HasSourcePositionTable());
int code_offset = Smi::ToInt(input_or_debug_pos());
// The stored bytecode offset is relative to a different base than what
// is used in the source position table, hence the subtraction.
code_offset -= BytecodeArray::kHeaderSize - kHeapObjectTag;
AbstractCode code =
AbstractCode::cast(function().shared().GetBytecodeArray());
return code.SourcePosition(code_offset);
}
// static
AccessCheckInfo AccessCheckInfo::Get(Isolate* isolate,
Handle<JSObject> receiver) {
DisallowHeapAllocation no_gc;
DCHECK(receiver->map().is_access_check_needed());
Object maybe_constructor = receiver->map().GetConstructor();
if (maybe_constructor.IsFunctionTemplateInfo()) {
Object data_obj =
FunctionTemplateInfo::cast(maybe_constructor).GetAccessCheckInfo();
if (data_obj.IsUndefined(isolate)) return AccessCheckInfo();
return AccessCheckInfo::cast(data_obj);
}
// Might happen for a detached context.
if (!maybe_constructor.IsJSFunction()) return AccessCheckInfo();
JSFunction constructor = JSFunction::cast(maybe_constructor);
// Might happen for the debug context.
if (!constructor.shared().IsApiFunction()) return AccessCheckInfo();
Object data_obj =
constructor.shared().get_api_func_data().GetAccessCheckInfo();
if (data_obj.IsUndefined(isolate)) return AccessCheckInfo();
return AccessCheckInfo::cast(data_obj);
}
MaybeHandle<Name> FunctionTemplateInfo::TryGetCachedPropertyName(
Isolate* isolate, Handle<Object> getter) {
if (getter->IsFunctionTemplateInfo()) {
Handle<FunctionTemplateInfo> fti =
Handle<FunctionTemplateInfo>::cast(getter);
// Check if the accessor uses a cached property.
if (!fti->cached_property_name().IsTheHole(isolate)) {
return handle(Name::cast(fti->cached_property_name()), isolate);
}
}
return MaybeHandle<Name>();
}
Address Smi::LexicographicCompare(Isolate* isolate, Smi x, Smi y) {
DisallowHeapAllocation no_allocation;
DisallowJavascriptExecution no_js(isolate);
int x_value = Smi::ToInt(x);
int y_value = Smi::ToInt(y);
// If the integers are equal so are the string representations.
if (x_value == y_value) return Smi::FromInt(0).ptr();
// If one of the integers is zero the normal integer order is the
// same as the lexicographic order of the string representations.
if (x_value == 0 || y_value == 0) {
return Smi::FromInt(x_value < y_value ? -1 : 1).ptr();
}
// If only one of the integers is negative the negative number is
// smallest because the char code of '-' is less than the char code
// of any digit. Otherwise, we make both values positive.
// Use unsigned values otherwise the logic is incorrect for -MIN_INT on
// architectures using 32-bit Smis.
uint32_t x_scaled = x_value;
uint32_t y_scaled = y_value;
if (x_value < 0) {
if (y_value >= 0) {
return Smi::FromInt(-1).ptr();
} else {
y_scaled = base::NegateWithWraparound(y_value);
}
x_scaled = base::NegateWithWraparound(x_value);
} else if (y_value < 0) {
return Smi::FromInt(1).ptr();
}
// clang-format off
static const uint32_t kPowersOf10[] = {
1, 10, 100, 1000,
10 * 1000, 100 * 1000, 1000 * 1000, 10 * 1000 * 1000,
100 * 1000 * 1000, 1000 * 1000 * 1000};
// clang-format on
// If the integers have the same number of decimal digits they can be
// compared directly as the numeric order is the same as the
// lexicographic order. If one integer has fewer digits, it is scaled
// by some power of 10 to have the same number of digits as the longer
// integer. If the scaled integers are equal it means the shorter
// integer comes first in the lexicographic order.
// From http://graphics.stanford.edu/~seander/bithacks.html#IntegerLog10
int x_log2 = 31 - base::bits::CountLeadingZeros(x_scaled);
int x_log10 = ((x_log2 + 1) * 1233) >> 12;
x_log10 -= x_scaled < kPowersOf10[x_log10];
int y_log2 = 31 - base::bits::CountLeadingZeros(y_scaled);
int y_log10 = ((y_log2 + 1) * 1233) >> 12;
y_log10 -= y_scaled < kPowersOf10[y_log10];
int tie = 0;
if (x_log10 < y_log10) {
// X has fewer digits. We would like to simply scale up X but that
// might overflow, e.g when comparing 9 with 1_000_000_000, 9 would
// be scaled up to 9_000_000_000. So we scale up by the next
// smallest power and scale down Y to drop one digit. It is OK to
// drop one digit from the longer integer since the final digit is
// past the length of the shorter integer.
x_scaled *= kPowersOf10[y_log10 - x_log10 - 1];
y_scaled /= 10;
tie = -1;
} else if (y_log10 < x_log10) {
y_scaled *= kPowersOf10[x_log10 - y_log10 - 1];
x_scaled /= 10;
tie = 1;
}
if (x_scaled < y_scaled) return Smi::FromInt(-1).ptr();
if (x_scaled > y_scaled) return Smi::FromInt(1).ptr();
return Smi::FromInt(tie).ptr();
}
// Force instantiation of template instances class.
// Please note this list is compiler dependent.
// Keep this at the end of this file
#define EXTERN_DEFINE_HASH_TABLE(DERIVED, SHAPE) \
template class EXPORT_TEMPLATE_DEFINE(V8_EXPORT_PRIVATE) \
HashTable<DERIVED, SHAPE>; \
\
template EXPORT_TEMPLATE_DEFINE(V8_EXPORT_PRIVATE) Handle<DERIVED> \
HashTable<DERIVED, SHAPE>::New(Isolate*, int, AllocationType, \
MinimumCapacity); \
template EXPORT_TEMPLATE_DEFINE(V8_EXPORT_PRIVATE) Handle<DERIVED> \
HashTable<DERIVED, SHAPE>::New(LocalIsolate*, int, AllocationType, \
MinimumCapacity); \
\
template EXPORT_TEMPLATE_DEFINE(V8_EXPORT_PRIVATE) Handle<DERIVED> \
HashTable<DERIVED, SHAPE>::EnsureCapacity(Isolate*, Handle<DERIVED>, int, \
AllocationType); \
template EXPORT_TEMPLATE_DEFINE(V8_EXPORT_PRIVATE) Handle<DERIVED> \
HashTable<DERIVED, SHAPE>::EnsureCapacity(LocalIsolate*, Handle<DERIVED>, \
int, AllocationType);
#define EXTERN_DEFINE_OBJECT_BASE_HASH_TABLE(DERIVED, SHAPE) \
EXTERN_DEFINE_HASH_TABLE(DERIVED, SHAPE) \
template class EXPORT_TEMPLATE_DEFINE(V8_EXPORT_PRIVATE) \
ObjectHashTableBase<DERIVED, SHAPE>;
#define EXTERN_DEFINE_DICTIONARY(DERIVED, SHAPE) \
EXTERN_DEFINE_HASH_TABLE(DERIVED, SHAPE) \
template class EXPORT_TEMPLATE_DEFINE(V8_EXPORT_PRIVATE) \
Dictionary<DERIVED, SHAPE>; \
\
template V8_EXPORT_PRIVATE Handle<DERIVED> Dictionary<DERIVED, SHAPE>::Add( \
Isolate* isolate, Handle<DERIVED>, Key, Handle<Object>, PropertyDetails, \
InternalIndex*); \
template V8_EXPORT_PRIVATE Handle<DERIVED> Dictionary<DERIVED, SHAPE>::Add( \
LocalIsolate* isolate, Handle<DERIVED>, Key, Handle<Object>, \
PropertyDetails, InternalIndex*);
#define EXTERN_DEFINE_BASE_NAME_DICTIONARY(DERIVED, SHAPE) \
EXTERN_DEFINE_DICTIONARY(DERIVED, SHAPE) \
template class EXPORT_TEMPLATE_DEFINE(V8_EXPORT_PRIVATE) \
BaseNameDictionary<DERIVED, SHAPE>; \
\
template V8_EXPORT_PRIVATE Handle<DERIVED> \
BaseNameDictionary<DERIVED, SHAPE>::New(Isolate*, int, AllocationType, \
MinimumCapacity); \
template V8_EXPORT_PRIVATE Handle<DERIVED> \
BaseNameDictionary<DERIVED, SHAPE>::New(LocalIsolate*, int, AllocationType, \
MinimumCapacity); \
\
template Handle<DERIVED> \
BaseNameDictionary<DERIVED, SHAPE>::AddNoUpdateNextEnumerationIndex( \
Isolate* isolate, Handle<DERIVED>, Key, Handle<Object>, PropertyDetails, \
InternalIndex*); \
template Handle<DERIVED> \
BaseNameDictionary<DERIVED, SHAPE>::AddNoUpdateNextEnumerationIndex( \
LocalIsolate* isolate, Handle<DERIVED>, Key, Handle<Object>, \
PropertyDetails, InternalIndex*);
EXTERN_DEFINE_HASH_TABLE(StringSet, StringSetShape)
EXTERN_DEFINE_HASH_TABLE(CompilationCacheTable, CompilationCacheShape)
EXTERN_DEFINE_HASH_TABLE(ObjectHashSet, ObjectHashSetShape)
EXTERN_DEFINE_OBJECT_BASE_HASH_TABLE(ObjectHashTable, ObjectHashTableShape)
EXTERN_DEFINE_OBJECT_BASE_HASH_TABLE(EphemeronHashTable, ObjectHashTableShape)
EXTERN_DEFINE_DICTIONARY(SimpleNumberDictionary, SimpleNumberDictionaryShape)
EXTERN_DEFINE_DICTIONARY(NumberDictionary, NumberDictionaryShape)
EXTERN_DEFINE_BASE_NAME_DICTIONARY(NameDictionary, NameDictionaryShape)
EXTERN_DEFINE_BASE_NAME_DICTIONARY(GlobalDictionary, GlobalDictionaryShape)
#undef EXTERN_DEFINE_HASH_TABLE
#undef EXTERN_DEFINE_OBJECT_BASE_HASH_TABLE
#undef EXTERN_DEFINE_DICTIONARY
#undef EXTERN_DEFINE_BASE_NAME_DICTIONARY
void JSFinalizationRegistry::RemoveCellFromUnregisterTokenMap(
Isolate* isolate, Address raw_finalization_registry,
Address raw_weak_cell) {
DisallowHeapAllocation no_gc;
JSFinalizationRegistry finalization_registry =
JSFinalizationRegistry::cast(Object(raw_finalization_registry));
WeakCell weak_cell = WeakCell::cast(Object(raw_weak_cell));
DCHECK(!weak_cell.unregister_token().IsUndefined(isolate));
// Remove weak_cell from the linked list of other WeakCells with the same
// unregister token and remove its unregister token from key_map if necessary
// without shrinking it. Since shrinking may allocate, it is performed by the
// caller after looping, or on exception.
if (weak_cell.key_list_prev().IsUndefined(isolate)) {
SimpleNumberDictionary key_map =
SimpleNumberDictionary::cast(finalization_registry.key_map());
Object unregister_token = weak_cell.unregister_token();
uint32_t key = Smi::ToInt(unregister_token.GetHash());
InternalIndex entry = key_map.FindEntry(isolate, key);
DCHECK(entry.is_found());
if (weak_cell.key_list_next().IsUndefined(isolate)) {
// weak_cell is the only one associated with its key; remove the key
// from the hash table.
key_map.ClearEntry(entry);
key_map.ElementRemoved();
} else {
// weak_cell is the list head for its key; we need to change the value
// of the key in the hash table.
WeakCell next = WeakCell::cast(weak_cell.key_list_next());
DCHECK_EQ(next.key_list_prev(), weak_cell);
next.set_key_list_prev(ReadOnlyRoots(isolate).undefined_value());
weak_cell.set_key_list_next(ReadOnlyRoots(isolate).undefined_value());
key_map.ValueAtPut(entry, next);
}
} else {
// weak_cell is somewhere in the middle of its key list.
WeakCell prev = WeakCell::cast(weak_cell.key_list_prev());
prev.set_key_list_next(weak_cell.key_list_next());
if (!weak_cell.key_list_next().IsUndefined()) {
WeakCell next = WeakCell::cast(weak_cell.key_list_next());
next.set_key_list_prev(weak_cell.key_list_prev());
}
}
}
} // namespace internal
} // namespace v8