blob: bb15b9aa14f5974173856eb32b8bbe403ed94dbf [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.h"
#include <cmath>
#include <iomanip>
#include <sstream>
#include "src/accessors.h"
#include "src/allocation-site-scopes.h"
#include "src/api.h"
#include "src/api-natives.h"
#include "src/arguments.h"
#include "src/base/bits.h"
#include "src/base/utils/random-number-generator.h"
#include "src/bootstrapper.h"
#include "src/code-stubs.h"
#include "src/codegen.h"
#include "src/compilation-dependencies.h"
#include "src/compiler.h"
#include "src/date.h"
#include "src/debug/debug.h"
#include "src/deoptimizer.h"
#include "src/elements.h"
#include "src/execution.h"
#include "src/field-index-inl.h"
#include "src/field-index.h"
#include "src/field-type.h"
#include "src/full-codegen/full-codegen.h"
#include "src/ic/ic.h"
#include "src/identity-map.h"
#include "src/interpreter/bytecodes.h"
#include "src/interpreter/source-position-table.h"
#include "src/isolate-inl.h"
#include "src/key-accumulator.h"
#include "src/list.h"
#include "src/log.h"
#include "src/lookup.h"
#include "src/macro-assembler.h"
#include "src/messages.h"
#include "src/objects-inl.h"
#include "src/objects-body-descriptors-inl.h"
#include "src/profiler/cpu-profiler.h"
#include "src/property-descriptor.h"
#include "src/prototype.h"
#include "src/regexp/jsregexp.h"
#include "src/safepoint-table.h"
#include "src/string-builder.h"
#include "src/string-search.h"
#include "src/string-stream.h"
#include "src/utils.h"
#include "src/zone.h"
#ifdef ENABLE_DISASSEMBLER
#include "src/disasm.h"
#include "src/disassembler.h"
#endif
namespace v8 {
namespace internal {
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();
return os << "UNKNOWN"; // Keep the compiler happy.
}
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);
}
MaybeHandle<JSReceiver> Object::ToObject(Isolate* isolate,
Handle<Object> object,
Handle<Context> native_context) {
if (object->IsJSReceiver()) return Handle<JSReceiver>::cast(object);
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) {
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<JSValue>::cast(result)->set_value(*object);
return result;
}
// static
MaybeHandle<Name> Object::ToName(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);
}
// static
MaybeHandle<Object> Object::ToNumber(Handle<Object> input) {
while (true) {
if (input->IsNumber()) {
return input;
}
if (input->IsString()) {
return String::ToNumber(Handle<String>::cast(input));
}
if (input->IsOddball()) {
return Oddball::ToNumber(Handle<Oddball>::cast(input));
}
Isolate* const isolate = Handle<HeapObject>::cast(input)->GetIsolate();
if (input->IsSymbol()) {
THROW_NEW_ERROR(isolate, NewTypeError(MessageTemplate::kSymbolToNumber),
Object);
}
if (input->IsSimd128Value()) {
THROW_NEW_ERROR(isolate, NewTypeError(MessageTemplate::kSimdToNumber),
Object);
}
ASSIGN_RETURN_ON_EXCEPTION(
isolate, input, JSReceiver::ToPrimitive(Handle<JSReceiver>::cast(input),
ToPrimitiveHint::kNumber),
Object);
}
}
// static
MaybeHandle<Object> Object::ToInteger(Isolate* isolate, Handle<Object> input) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, input, ToNumber(input), Object);
return isolate->factory()->NewNumber(DoubleToInteger(input->Number()));
}
// static
MaybeHandle<Object> Object::ToInt32(Isolate* isolate, Handle<Object> input) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, input, ToNumber(input), Object);
return isolate->factory()->NewNumberFromInt(DoubleToInt32(input->Number()));
}
// static
MaybeHandle<Object> Object::ToUint32(Isolate* isolate, Handle<Object> input) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, input, ToNumber(input), Object);
return isolate->factory()->NewNumberFromUint(DoubleToUint32(input->Number()));
}
// static
MaybeHandle<String> Object::ToString(Isolate* isolate, Handle<Object> input) {
while (true) {
if (input->IsString()) {
return Handle<String>::cast(input);
}
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->IsSimd128Value()) {
return Simd128Value::ToString(Handle<Simd128Value>::cast(input));
}
ASSIGN_RETURN_ON_EXCEPTION(
isolate, input, JSReceiver::ToPrimitive(Handle<JSReceiver>::cast(input),
ToPrimitiveHint::kString),
String);
}
}
// static
MaybeHandle<Object> Object::ToLength(Isolate* isolate, Handle<Object> input) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, input, ToNumber(input), Object);
double len = DoubleToInteger(input->Number());
if (len <= 0.0) {
len = 0.0;
} else if (len >= kMaxSafeInteger) {
len = kMaxSafeInteger;
}
return isolate->factory()->NewNumber(len);
}
bool Object::BooleanValue() {
if (IsBoolean()) return IsTrue();
if (IsSmi()) return Smi::cast(this)->value() != 0;
if (IsUndefined() || IsNull()) return false;
if (IsUndetectableObject()) return false; // Undetectable object is false.
if (IsString()) return String::cast(this)->length() != 0;
if (IsHeapNumber()) return HeapNumber::cast(this)->HeapNumberBooleanValue();
return true;
}
namespace {
// TODO(bmeurer): Maybe we should introduce a marker interface Number,
// where we put all these methods at some point?
ComparisonResult NumberCompare(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;
}
}
bool NumberEquals(double x, double y) {
// Must check explicitly for NaN's on Windows, but -0 works fine.
if (std::isnan(x)) return false;
if (std::isnan(y)) return false;
return x == y;
}
bool NumberEquals(const Object* x, const Object* y) {
return NumberEquals(x->Number(), y->Number());
}
bool NumberEquals(Handle<Object> x, Handle<Object> y) {
return NumberEquals(*x, *y);
}
} // namespace
// static
Maybe<ComparisonResult> Object::Compare(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(Handle<String>::cast(x), Handle<String>::cast(y)));
}
// ES6 section 7.2.11 Abstract Relational Comparison step 6.
if (!Object::ToNumber(x).ToHandle(&x) || !Object::ToNumber(y).ToHandle(&y)) {
return Nothing<ComparisonResult>();
}
return Just(NumberCompare(x->Number(), y->Number()));
}
// static
Maybe<bool> Object::Equals(Handle<Object> x, Handle<Object> y) {
while (true) {
if (x->IsNumber()) {
if (y->IsNumber()) {
return Just(NumberEquals(x, y));
} else if (y->IsBoolean()) {
return Just(NumberEquals(*x, Handle<Oddball>::cast(y)->to_number()));
} else if (y->IsString()) {
return Just(NumberEquals(x, String::ToNumber(Handle<String>::cast(y))));
} else if (y->IsJSReceiver() && !y->IsUndetectableObject()) {
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(Handle<String>::cast(x), Handle<String>::cast(y)));
} else if (y->IsNumber()) {
x = String::ToNumber(Handle<String>::cast(x));
return Just(NumberEquals(x, y));
} else if (y->IsBoolean()) {
x = String::ToNumber(Handle<String>::cast(x));
return Just(NumberEquals(*x, Handle<Oddball>::cast(y)->to_number()));
} else if (y->IsJSReceiver() && !y->IsUndetectableObject()) {
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(NumberEquals(Handle<Oddball>::cast(x)->to_number(), *y));
} else if (y->IsString()) {
y = String::ToNumber(Handle<String>::cast(y));
return Just(NumberEquals(Handle<Oddball>::cast(x)->to_number(), *y));
} else if (y->IsJSReceiver() && !y->IsUndetectableObject()) {
if (!JSReceiver::ToPrimitive(Handle<JSReceiver>::cast(y))
.ToHandle(&y)) {
return Nothing<bool>();
}
x = Oddball::ToNumber(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() && !y->IsUndetectableObject()) {
if (!JSReceiver::ToPrimitive(Handle<JSReceiver>::cast(y))
.ToHandle(&y)) {
return Nothing<bool>();
}
} else {
return Just(false);
}
} else if (x->IsSimd128Value()) {
if (y->IsSimd128Value()) {
return Just(Simd128Value::Equals(Handle<Simd128Value>::cast(x),
Handle<Simd128Value>::cast(y)));
} else if (y->IsJSReceiver() && !y->IsUndetectableObject()) {
if (!JSReceiver::ToPrimitive(Handle<JSReceiver>::cast(y))
.ToHandle(&y)) {
return Nothing<bool>();
}
} else {
return Just(false);
}
} else if (x->IsJSReceiver() && !x->IsUndetectableObject()) {
if (y->IsJSReceiver()) {
return Just(x.is_identical_to(y));
} else if (y->IsNull() || y->IsUndefined()) {
return Just(false);
} else if (y->IsBoolean()) {
y = Oddball::ToNumber(Handle<Oddball>::cast(y));
} else if (!JSReceiver::ToPrimitive(Handle<JSReceiver>::cast(x))
.ToHandle(&x)) {
return Nothing<bool>();
}
} else {
return Just(
(x->IsNull() || x->IsUndefined() || x->IsUndetectableObject()) &&
(y->IsNull() || y->IsUndefined() || y->IsUndetectableObject()));
}
}
}
bool Object::StrictEquals(Object* that) {
if (this->IsNumber()) {
if (!that->IsNumber()) return false;
return NumberEquals(this, that);
} else if (this->IsString()) {
if (!that->IsString()) return false;
return String::cast(this)->Equals(String::cast(that));
} else if (this->IsSimd128Value()) {
if (!that->IsSimd128Value()) return false;
return Simd128Value::cast(this)->Equals(Simd128Value::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());
if (object->IsUndetectableObject()) {
return isolate->factory()->undefined_string();
}
if (object->IsString()) return isolate->factory()->string_string();
if (object->IsSymbol()) return isolate->factory()->symbol_string();
if (object->IsString()) return isolate->factory()->string_string();
#define SIMD128_TYPE(TYPE, Type, type, lane_count, lane_type) \
if (object->Is##Type()) return isolate->factory()->type##_string();
SIMD128_TYPES(SIMD128_TYPE)
#undef SIMD128_TYPE
if (object->IsCallable()) return isolate->factory()->function_string();
return isolate->factory()->object_string();
}
// static
MaybeHandle<Object> Object::Multiply(Isolate* isolate, Handle<Object> lhs,
Handle<Object> rhs) {
if (!lhs->IsNumber() || !rhs->IsNumber()) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, lhs, Object::ToNumber(lhs), Object);
ASSIGN_RETURN_ON_EXCEPTION(isolate, rhs, Object::ToNumber(rhs), Object);
}
return isolate->factory()->NewNumber(lhs->Number() * rhs->Number());
}
// static
MaybeHandle<Object> Object::Divide(Isolate* isolate, Handle<Object> lhs,
Handle<Object> rhs) {
if (!lhs->IsNumber() || !rhs->IsNumber()) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, lhs, Object::ToNumber(lhs), Object);
ASSIGN_RETURN_ON_EXCEPTION(isolate, rhs, Object::ToNumber(rhs), Object);
}
return isolate->factory()->NewNumber(lhs->Number() / rhs->Number());
}
// static
MaybeHandle<Object> Object::Modulus(Isolate* isolate, Handle<Object> lhs,
Handle<Object> rhs) {
if (!lhs->IsNumber() || !rhs->IsNumber()) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, lhs, Object::ToNumber(lhs), Object);
ASSIGN_RETURN_ON_EXCEPTION(isolate, rhs, Object::ToNumber(rhs), Object);
}
return isolate->factory()->NewNumber(modulo(lhs->Number(), rhs->Number()));
}
// 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(rhs), Object);
ASSIGN_RETURN_ON_EXCEPTION(isolate, lhs, Object::ToNumber(lhs), Object);
return isolate->factory()->NewNumber(lhs->Number() + rhs->Number());
}
// static
MaybeHandle<Object> Object::Subtract(Isolate* isolate, Handle<Object> lhs,
Handle<Object> rhs) {
if (!lhs->IsNumber() || !rhs->IsNumber()) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, lhs, Object::ToNumber(lhs), Object);
ASSIGN_RETURN_ON_EXCEPTION(isolate, rhs, Object::ToNumber(rhs), Object);
}
return isolate->factory()->NewNumber(lhs->Number() - rhs->Number());
}
// static
MaybeHandle<Object> Object::ShiftLeft(Isolate* isolate, Handle<Object> lhs,
Handle<Object> rhs) {
if (!lhs->IsNumber() || !rhs->IsNumber()) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, lhs, Object::ToNumber(lhs), Object);
ASSIGN_RETURN_ON_EXCEPTION(isolate, rhs, Object::ToNumber(rhs), Object);
}
return isolate->factory()->NewNumberFromInt(NumberToInt32(*lhs)
<< (NumberToUint32(*rhs) & 0x1F));
}
// static
MaybeHandle<Object> Object::ShiftRight(Isolate* isolate, Handle<Object> lhs,
Handle<Object> rhs) {
if (!lhs->IsNumber() || !rhs->IsNumber()) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, lhs, Object::ToNumber(lhs), Object);
ASSIGN_RETURN_ON_EXCEPTION(isolate, rhs, Object::ToNumber(rhs), Object);
}
return isolate->factory()->NewNumberFromInt(NumberToInt32(*lhs) >>
(NumberToUint32(*rhs) & 0x1F));
}
// static
MaybeHandle<Object> Object::ShiftRightLogical(Isolate* isolate,
Handle<Object> lhs,
Handle<Object> rhs) {
if (!lhs->IsNumber() || !rhs->IsNumber()) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, lhs, Object::ToNumber(lhs), Object);
ASSIGN_RETURN_ON_EXCEPTION(isolate, rhs, Object::ToNumber(rhs), Object);
}
return isolate->factory()->NewNumberFromUint(NumberToUint32(*lhs) >>
(NumberToUint32(*rhs) & 0x1F));
}
// static
MaybeHandle<Object> Object::BitwiseAnd(Isolate* isolate, Handle<Object> lhs,
Handle<Object> rhs) {
if (!lhs->IsNumber() || !rhs->IsNumber()) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, lhs, Object::ToNumber(lhs), Object);
ASSIGN_RETURN_ON_EXCEPTION(isolate, rhs, Object::ToNumber(rhs), Object);
}
return isolate->factory()->NewNumberFromInt(NumberToInt32(*lhs) &
NumberToInt32(*rhs));
}
// static
MaybeHandle<Object> Object::BitwiseOr(Isolate* isolate, Handle<Object> lhs,
Handle<Object> rhs) {
if (!lhs->IsNumber() || !rhs->IsNumber()) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, lhs, Object::ToNumber(lhs), Object);
ASSIGN_RETURN_ON_EXCEPTION(isolate, rhs, Object::ToNumber(rhs), Object);
}
return isolate->factory()->NewNumberFromInt(NumberToInt32(*lhs) |
NumberToInt32(*rhs));
}
// static
MaybeHandle<Object> Object::BitwiseXor(Isolate* isolate, Handle<Object> lhs,
Handle<Object> rhs) {
if (!lhs->IsNumber() || !rhs->IsNumber()) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, lhs, Object::ToNumber(lhs), Object);
ASSIGN_RETURN_ON_EXCEPTION(isolate, rhs, Object::ToNumber(rhs), Object);
}
return isolate->factory()->NewNumberFromInt(NumberToInt32(*lhs) ^
NumberToInt32(*rhs));
}
Maybe<bool> Object::IsArray(Handle<Object> object) {
if (object->IsJSArray()) return Just(true);
if (object->IsJSProxy()) {
Handle<JSProxy> proxy = Handle<JSProxy>::cast(object);
Isolate* isolate = proxy->GetIsolate();
if (proxy->IsRevoked()) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyRevoked,
isolate->factory()->NewStringFromAsciiChecked("IsArray")));
return Nothing<bool>();
}
return Object::IsArray(handle(proxy->target(), isolate));
}
return Just(false);
}
bool Object::IsPromise(Handle<Object> object) {
if (!object->IsJSObject()) return false;
auto js_object = Handle<JSObject>::cast(object);
// Promises can't have access checks.
if (js_object->map()->is_access_check_needed()) return false;
auto isolate = js_object->GetIsolate();
// TODO(dcarney): this should just be read from the symbol registry so as not
// to be context dependent.
auto key = isolate->factory()->promise_status_symbol();
// Shouldn't be possible to throw here.
return JSObject::HasRealNamedProperty(js_object, key).FromJust();
}
// 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(receiver, name), Object);
if (func->IsNull() || func->IsUndefined()) {
return isolate->factory()->undefined_value();
}
if (!func->IsCallable()) {
THROW_NEW_ERROR(isolate, NewTypeError(MessageTemplate::kPropertyNotFunction,
func, name, receiver),
Object);
}
return func;
}
// static
MaybeHandle<FixedArray> Object::CreateListFromArrayLike(
Isolate* isolate, Handle<Object> object, ElementTypes element_types) {
// 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<Object> raw_length_obj;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, raw_length_obj,
JSReceiver::GetProperty(object, isolate->factory()->length_string()),
FixedArray);
Handle<Object> raw_length_number;
ASSIGN_RETURN_ON_EXCEPTION(isolate, raw_length_number,
Object::ToLength(isolate, raw_length_obj),
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, Object::GetElement(isolate, object, 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
Maybe<bool> JSReceiver::HasProperty(LookupIterator* it) {
for (; it->IsFound(); it->Next()) {
switch (it->state()) {
case LookupIterator::NOT_FOUND:
case LookupIterator::TRANSITION:
UNREACHABLE();
case LookupIterator::JSPROXY:
// Call the "has" trap on proxies.
return JSProxy::HasProperty(it->isolate(), it->GetHolder<JSProxy>(),
it->GetName());
case LookupIterator::INTERCEPTOR: {
Maybe<PropertyAttributes> result =
JSObject::GetPropertyAttributesWithInterceptor(it);
if (!result.IsJust()) return Nothing<bool>();
if (result.FromJust() != ABSENT) return Just(true);
break;
}
case LookupIterator::ACCESS_CHECK: {
if (it->HasAccess()) break;
Maybe<PropertyAttributes> result =
JSObject::GetPropertyAttributesWithFailedAccessCheck(it);
if (!result.IsJust()) return Nothing<bool>();
return Just(result.FromJust() != ABSENT);
}
case LookupIterator::INTEGER_INDEXED_EXOTIC:
// TypedArray out-of-bounds access.
return Just(false);
case LookupIterator::ACCESSOR:
case LookupIterator::DATA:
return Just(true);
}
}
return Just(false);
}
// static
MaybeHandle<Object> Object::GetProperty(LookupIterator* it) {
for (; it->IsFound(); it->Next()) {
switch (it->state()) {
case LookupIterator::NOT_FOUND:
case LookupIterator::TRANSITION:
UNREACHABLE();
case LookupIterator::JSPROXY: {
bool was_found;
MaybeHandle<Object> result =
JSProxy::GetProperty(it->isolate(), it->GetHolder<JSProxy>(),
it->GetName(), it->GetReceiver(), &was_found);
if (!was_found) 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 ReadAbsentProperty(it);
case LookupIterator::DATA:
return it->GetDataValue();
}
}
return ReadAbsentProperty(it);
}
#define STACK_CHECK(result_value) \
do { \
StackLimitCheck stack_check(isolate); \
if (stack_check.HasOverflowed()) { \
isolate->Throw(*isolate->factory()->NewRangeError( \
MessageTemplate::kStackOverflow)); \
return result_value; \
} \
} while (false)
// static
MaybeHandle<Object> JSProxy::GetProperty(Isolate* isolate,
Handle<JSProxy> proxy,
Handle<Name> name,
Handle<Object> receiver,
bool* was_found) {
*was_found = true;
if (receiver->IsJSGlobalObject()) {
THROW_NEW_ERROR(
isolate,
NewTypeError(MessageTemplate::kReadGlobalReferenceThroughProxy, name),
Object);
}
DCHECK(!name->IsPrivate());
STACK_CHECK(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(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()) {
// 7.a Return target.[[Get]](P, Receiver).
LookupIterator it =
LookupIterator::PropertyOrElement(isolate, receiver, name, 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);
// 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) {
THROW_NEW_ERROR(
isolate, NewTypeError(MessageTemplate::kProxyGetNonConfigurableData,
name, target_desc.value(), trap_result),
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.
inconsistent = PropertyDescriptor::IsAccessorDescriptor(&target_desc) &&
!target_desc.configurable() &&
target_desc.get()->IsUndefined() &&
!trap_result->IsUndefined();
if (inconsistent) {
THROW_NEW_ERROR(
isolate,
NewTypeError(MessageTemplate::kProxyGetNonConfigurableAccessor, name,
trap_result),
Object);
}
}
// 11. Return trap_result
return trap_result;
}
Handle<Object> JSReceiver::GetDataProperty(Handle<JSReceiver> object,
Handle<Name> name) {
LookupIterator it(object, name,
LookupIterator::PROTOTYPE_CHAIN_SKIP_INTERCEPTOR);
return GetDataProperty(&it);
}
Handle<Object> JSReceiver::GetDataProperty(LookupIterator* it) {
for (; it->IsFound(); it->Next()) {
switch (it->state()) {
case LookupIterator::INTERCEPTOR:
case LookupIterator::NOT_FOUND:
case LookupIterator::TRANSITION:
UNREACHABLE();
case LookupIterator::ACCESS_CHECK:
// Support calling this method without an active context, but refuse
// access to access-checked objects in that case.
if (it->isolate()->context() != nullptr && it->HasAccess()) continue;
// Fall through.
case LookupIterator::JSPROXY:
it->NotFound();
return it->isolate()->factory()->undefined_value();
case LookupIterator::ACCESSOR:
// TODO(verwaest): For now this doesn't call into AccessorInfo, since
// clients don't need it. Update once relevant.
it->NotFound();
return it->isolate()->factory()->undefined_value();
case LookupIterator::INTEGER_INDEXED_EXOTIC:
return it->isolate()->factory()->undefined_value();
case LookupIterator::DATA:
return it->GetDataValue();
}
}
return it->isolate()->factory()->undefined_value();
}
bool Object::ToInt32(int32_t* value) {
if (IsSmi()) {
*value = Smi::cast(this)->value();
return true;
}
if (IsHeapNumber()) {
double num = HeapNumber::cast(this)->value();
if (FastI2D(FastD2I(num)) == num) {
*value = FastD2I(num);
return true;
}
}
return false;
}
bool Object::ToUint32(uint32_t* value) {
if (IsSmi()) {
int num = Smi::cast(this)->value();
if (num < 0) return false;
*value = static_cast<uint32_t>(num);
return true;
}
if (IsHeapNumber()) {
double num = HeapNumber::cast(this)->value();
if (num < 0) return false;
uint32_t uint_value = FastD2UI(num);
if (FastUI2D(uint_value) == num) {
*value = uint_value;
return true;
}
}
return false;
}
bool FunctionTemplateInfo::IsTemplateFor(Object* object) {
if (!object->IsHeapObject()) return false;
return IsTemplateFor(HeapObject::cast(object)->map());
}
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();
if (!cons_obj->IsJSFunction()) return false;
JSFunction* fun = JSFunction::cast(cons_obj);
// Iterate through the chain of inheriting function templates to
// see if the required one occurs.
for (Object* type = fun->shared()->function_data();
type->IsFunctionTemplateInfo();
type = FunctionTemplateInfo::cast(type)->parent_template()) {
if (type == this) return true;
}
// Didn't find the required type in the inheritance chain.
return false;
}
// TODO(dcarney): CallOptimization duplicates this logic, merge.
Object* FunctionTemplateInfo::GetCompatibleReceiver(Isolate* isolate,
Object* receiver) {
// API calls are only supported with JSObject receivers.
if (!receiver->IsJSObject()) return isolate->heap()->null_value();
Object* recv_type = this->signature();
// No signature, return holder.
if (recv_type->IsUndefined()) return receiver;
FunctionTemplateInfo* signature = FunctionTemplateInfo::cast(recv_type);
// Check the receiver.
for (PrototypeIterator iter(isolate, JSObject::cast(receiver),
PrototypeIterator::START_AT_RECEIVER,
PrototypeIterator::END_AT_NON_HIDDEN);
!iter.IsAtEnd(); iter.Advance()) {
if (signature->IsTemplateFor(iter.GetCurrent())) return iter.GetCurrent();
}
return isolate->heap()->null_value();
}
// static
MaybeHandle<JSObject> JSObject::New(Handle<JSFunction> constructor,
Handle<JSReceiver> new_target,
Handle<AllocationSite> site) {
// If called through new, new.target can be:
// - a subclass of constructor,
// - a proxy wrapper around constructor, or
// - the constructor itself.
// If called through Reflect.construct, it's guaranteed to be a constructor.
Isolate* const isolate = constructor->GetIsolate();
DCHECK(constructor->IsConstructor());
DCHECK(new_target->IsConstructor());
DCHECK(!constructor->has_initial_map() ||
constructor->initial_map()->instance_type() != JS_FUNCTION_TYPE);
Handle<Map> initial_map;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, initial_map,
JSFunction::GetDerivedMap(isolate, constructor, new_target), JSObject);
Handle<JSObject> result =
isolate->factory()->NewJSObjectFromMap(initial_map, NOT_TENURED, site);
isolate->counters()->constructed_objects()->Increment();
isolate->counters()->constructed_objects_runtime()->Increment();
return result;
}
Handle<FixedArray> JSObject::EnsureWritableFastElements(
Handle<JSObject> object) {
DCHECK(object->HasFastSmiOrObjectElements() ||
object->HasFastStringWrapperElements());
Isolate* isolate = object->GetIsolate();
Handle<FixedArray> elems(FixedArray::cast(object->elements()), isolate);
if (elems->map() != isolate->heap()->fixed_cow_array_map()) return elems;
Handle<FixedArray> writable_elems = isolate->factory()->CopyFixedArrayWithMap(
elems, isolate->factory()->fixed_array_map());
object->set_elements(*writable_elems);
isolate->counters()->cow_arrays_converted()->Increment();
return writable_elems;
}
// ES6 9.5.1
// static
MaybeHandle<Object> JSProxy::GetPrototype(Handle<JSProxy> proxy) {
Isolate* isolate = proxy->GetIsolate();
Handle<String> trap_name = isolate->factory()->getPrototypeOf_string();
STACK_CHECK(MaybeHandle<Object>());
// 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),
Object);
}
Handle<JSReceiver> target(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, GetMethod(handler, trap_name),
Object);
// 6. If trap is undefined, then return target.[[GetPrototypeOf]]().
if (trap->IsUndefined()) {
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), Object);
// 8. If Type(handlerProto) is neither Object nor Null, throw a TypeError.
if (!(handler_proto->IsJSReceiver() || handler_proto->IsNull())) {
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kProxyGetPrototypeOfInvalid),
Object);
}
// 9. Let extensibleTarget be ? IsExtensible(target).
Maybe<bool> is_extensible = JSReceiver::IsExtensible(target);
MAYBE_RETURN_NULL(is_extensible);
// 10. If extensibleTarget is true, return handlerProto.
if (is_extensible.FromJust()) return handler_proto;
// 11. Let targetProto be ? target.[[GetPrototypeOf]]().
Handle<Object> target_proto;
ASSIGN_RETURN_ON_EXCEPTION(isolate, target_proto,
JSReceiver::GetPrototype(isolate, target), Object);
// 12. If SameValue(handlerProto, targetProto) is false, throw a TypeError.
if (!handler_proto->SameValue(*target_proto)) {
THROW_NEW_ERROR(
isolate,
NewTypeError(MessageTemplate::kProxyGetPrototypeOfNonExtensible),
Object);
}
// 13. Return handlerProto.
return handler_proto;
}
MaybeHandle<Object> Object::GetPropertyWithAccessor(LookupIterator* it) {
Isolate* isolate = it->isolate();
Handle<Object> structure = it->GetAccessors();
Handle<Object> receiver = it->GetReceiver();
// 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.
if (structure->IsAccessorInfo()) {
Handle<JSObject> holder = it->GetHolder<JSObject>();
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);
}
v8::AccessorNameGetterCallback call_fun =
v8::ToCData<v8::AccessorNameGetterCallback>(info->getter());
if (call_fun == nullptr) return isolate->factory()->undefined_value();
LOG(isolate, ApiNamedPropertyAccess("load", *holder, *name));
PropertyCallbackArguments args(isolate, info->data(), *receiver, *holder,
Object::DONT_THROW);
v8::Local<v8::Value> result = args.Call(call_fun, v8::Utils::ToLocal(name));
RETURN_EXCEPTION_IF_SCHEDULED_EXCEPTION(isolate, Object);
if (result.IsEmpty()) {
return ReadAbsentProperty(isolate, receiver, name);
}
Handle<Object> return_value = v8::Utils::OpenHandle(*result);
return_value->VerifyApiCallResultType();
// Rebox handle before return.
return handle(*return_value, isolate);
}
// Regular accessor.
Handle<Object> getter(AccessorPair::cast(*structure)->getter(), isolate);
if (getter->IsFunctionTemplateInfo()) {
auto result = Builtins::InvokeApiFunction(
Handle<FunctionTemplateInfo>::cast(getter), receiver, 0, nullptr);
if (isolate->has_pending_exception()) {
return MaybeHandle<Object>();
}
Handle<Object> return_value;
if (result.ToHandle(&return_value)) {
return_value->VerifyApiCallResultType();
return handle(*return_value, isolate);
}
} 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 ReadAbsentProperty(isolate, receiver, it->GetName());
}
bool AccessorInfo::IsCompatibleReceiverMap(Isolate* isolate,
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,
ShouldThrow should_throw) {
Isolate* isolate = it->isolate();
Handle<Object> structure = it->GetAccessors();
Handle<Object> receiver = it->GetReceiver();
// 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.
if (structure->IsAccessorInfo()) {
Handle<JSObject> holder = it->GetHolder<JSObject>();
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>();
}
v8::AccessorNameSetterCallback call_fun =
v8::ToCData<v8::AccessorNameSetterCallback>(info->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.
if (call_fun == nullptr) return Just(true);
LOG(isolate, ApiNamedPropertyAccess("store", *holder, *name));
PropertyCallbackArguments args(isolate, info->data(), *receiver, *holder,
should_throw);
args.Call(call_fun, v8::Utils::ToLocal(name), v8::Utils::ToLocal(value));
RETURN_VALUE_IF_SCHEDULED_EXCEPTION(isolate, Nothing<bool>());
return Just(true);
}
// Regular accessor.
Handle<Object> setter(AccessorPair::cast(*structure)->setter(), isolate);
if (setter->IsFunctionTemplateInfo()) {
Handle<Object> argv[] = {value};
auto result =
Builtins::InvokeApiFunction(Handle<FunctionTemplateInfo>::cast(setter),
receiver, arraysize(argv), argv);
if (isolate->has_pending_exception()) {
return 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, should_throw);
}
RETURN_FAILURE(isolate, 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, NULL);
}
Maybe<bool> Object::SetPropertyWithDefinedSetter(Handle<Object> receiver,
Handle<JSReceiver> setter,
Handle<Object> value,
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);
}
// static
bool Object::IsErrorObject(Isolate* isolate, Handle<Object> object) {
if (!object->IsJSObject()) return false;
// Use stack_trace_symbol as proxy for [[ErrorData]].
Handle<Name> symbol = isolate->factory()->stack_trace_symbol();
Maybe<bool> has_stack_trace =
JSReceiver::HasOwnProperty(Handle<JSReceiver>::cast(object), symbol);
DCHECK(!has_stack_trace.IsNothing());
return has_stack_trace.FromJust();
}
// static
bool JSObject::AllCanRead(LookupIterator* it) {
// Skip current iteration, it's in state ACCESS_CHECK or INTERCEPTOR, both of
// which have already been checked.
DCHECK(it->state() == LookupIterator::ACCESS_CHECK ||
it->state() == LookupIterator::INTERCEPTOR);
for (it->Next(); it->IsFound(); it->Next()) {
if (it->state() == LookupIterator::ACCESSOR) {
auto accessors = it->GetAccessors();
if (accessors->IsAccessorInfo()) {
if (AccessorInfo::cast(*accessors)->all_can_read()) return true;
}
} else if (it->state() == LookupIterator::INTERCEPTOR) {
if (it->GetInterceptor()->all_can_read()) return true;
} else if (it->state() == LookupIterator::JSPROXY) {
// Stop lookupiterating. And no, AllCanNotRead.
return false;
}
}
return false;
}
MaybeHandle<Object> JSObject::GetPropertyWithFailedAccessCheck(
LookupIterator* it) {
Handle<JSObject> checked = it->GetHolder<JSObject>();
while (AllCanRead(it)) {
if (it->state() == LookupIterator::ACCESSOR) {
return GetPropertyWithAccessor(it);
}
DCHECK_EQ(LookupIterator::INTERCEPTOR, it->state());
bool done;
Handle<Object> result;
ASSIGN_RETURN_ON_EXCEPTION(it->isolate(), result,
GetPropertyWithInterceptor(it, &done), Object);
if (done) return result;
}
// Cross-Origin [[Get]] of Well-Known Symbols does not throw, and returns
// undefined.
Handle<Name> name = it->GetName();
if (name->IsSymbol() && Symbol::cast(*name)->is_well_known_symbol()) {
return it->factory()->undefined_value();
}
it->isolate()->ReportFailedAccessCheck(checked);
RETURN_EXCEPTION_IF_SCHEDULED_EXCEPTION(it->isolate(), Object);
return it->factory()->undefined_value();
}
Maybe<PropertyAttributes> JSObject::GetPropertyAttributesWithFailedAccessCheck(
LookupIterator* it) {
Handle<JSObject> checked = it->GetHolder<JSObject>();
while (AllCanRead(it)) {
if (it->state() == LookupIterator::ACCESSOR) {
return Just(it->property_attributes());
}
DCHECK_EQ(LookupIterator::INTERCEPTOR, it->state());
auto result = GetPropertyAttributesWithInterceptor(it);
if (it->isolate()->has_scheduled_exception()) break;
if (result.IsJust() && result.FromJust() != ABSENT) return result;
}
it->isolate()->ReportFailedAccessCheck(checked);
RETURN_VALUE_IF_SCHEDULED_EXCEPTION(it->isolate(),
Nothing<PropertyAttributes>());
return Just(ABSENT);
}
// static
bool JSObject::AllCanWrite(LookupIterator* it) {
for (; it->IsFound() && it->state() != LookupIterator::JSPROXY; it->Next()) {
if (it->state() == LookupIterator::ACCESSOR) {
Handle<Object> accessors = it->GetAccessors();
if (accessors->IsAccessorInfo()) {
if (AccessorInfo::cast(*accessors)->all_can_write()) return true;
}
}
}
return false;
}
Maybe<bool> JSObject::SetPropertyWithFailedAccessCheck(
LookupIterator* it, Handle<Object> value, ShouldThrow should_throw) {
Handle<JSObject> checked = it->GetHolder<JSObject>();
if (AllCanWrite(it)) {
return SetPropertyWithAccessor(it, value, should_throw);
}
it->isolate()->ReportFailedAccessCheck(checked);
RETURN_VALUE_IF_SCHEDULED_EXCEPTION(it->isolate(), Nothing<bool>());
return Just(true);
}
void JSObject::SetNormalizedProperty(Handle<JSObject> object,
Handle<Name> name,
Handle<Object> value,
PropertyDetails details) {
DCHECK(!object->HasFastProperties());
if (!name->IsUniqueName()) {
name = object->GetIsolate()->factory()->InternalizeString(
Handle<String>::cast(name));
}
if (object->IsJSGlobalObject()) {
Handle<GlobalDictionary> property_dictionary(object->global_dictionary());
int entry = property_dictionary->FindEntry(name);
if (entry == GlobalDictionary::kNotFound) {
auto cell = object->GetIsolate()->factory()->NewPropertyCell();
cell->set_value(*value);
auto cell_type = value->IsUndefined() ? PropertyCellType::kUndefined
: PropertyCellType::kConstant;
details = details.set_cell_type(cell_type);
value = cell;
property_dictionary =
GlobalDictionary::Add(property_dictionary, name, value, details);
object->set_properties(*property_dictionary);
} else {
PropertyCell::UpdateCell(property_dictionary, entry, value, details);
}
} else {
Handle<NameDictionary> property_dictionary(object->property_dictionary());
int entry = property_dictionary->FindEntry(name);
if (entry == NameDictionary::kNotFound) {
property_dictionary =
NameDictionary::Add(property_dictionary, name, value, details);
object->set_properties(*property_dictionary);
} else {
PropertyDetails original_details = property_dictionary->DetailsAt(entry);
int enumeration_index = original_details.dictionary_index();
DCHECK(enumeration_index > 0);
details = details.set_index(enumeration_index);
property_dictionary->SetEntry(entry, name, value, details);
}
}
}
Maybe<bool> JSReceiver::HasInPrototypeChain(Isolate* isolate,
Handle<JSReceiver> object,
Handle<Object> proto) {
PrototypeIterator iter(isolate, object, PrototypeIterator::START_AT_RECEIVER);
while (true) {
if (!iter.AdvanceFollowingProxies()) return Nothing<bool>();
if (iter.IsAtEnd()) return Just(false);
if (PrototypeIterator::GetCurrent(iter).is_identical_to(proto)) {
return Just(true);
}
}
}
Map* Object::GetRootMap(Isolate* isolate) {
DisallowHeapAllocation no_alloc;
if (IsSmi()) {
Context* native_context = isolate->context()->native_context();
return native_context->number_function()->initial_map();
}
// The object is either a number, a string, a symbol, a boolean, a SIMD value,
// a real JS object, or a Harmony proxy.
HeapObject* heap_object = HeapObject::cast(this);
if (heap_object->IsJSReceiver()) {
return heap_object->map();
}
int constructor_function_index =
heap_object->map()->GetConstructorFunctionIndex();
if (constructor_function_index != Map::kNoConstructorFunctionIndex) {
Context* native_context = isolate->context()->native_context();
JSFunction* constructor_function =
JSFunction::cast(native_context->get(constructor_function_index));
return constructor_function->initial_map();
}
return isolate->heap()->null_value()->map();
}
Object* Object::GetHash() {
Object* hash = GetSimpleHash();
if (hash->IsSmi()) return hash;
DCHECK(IsJSReceiver());
return JSReceiver::cast(this)->GetIdentityHash();
}
Object* Object::GetSimpleHash() {
// The object is either a Smi, a HeapNumber, a name, an odd-ball,
// a SIMD value type, a real JS object, or a Harmony proxy.
if (IsSmi()) {
uint32_t hash = ComputeIntegerHash(Smi::cast(this)->value(), kZeroHashSeed);
return Smi::FromInt(hash & Smi::kMaxValue);
}
if (IsHeapNumber()) {
double num = HeapNumber::cast(this)->value();
if (std::isnan(num)) return Smi::FromInt(Smi::kMaxValue);
if (i::IsMinusZero(num)) num = 0;
if (IsSmiDouble(num)) {
return Smi::FromInt(FastD2I(num))->GetHash();
}
uint32_t hash = ComputeLongHash(double_to_uint64(num));
return Smi::FromInt(hash & Smi::kMaxValue);
}
if (IsName()) {
uint32_t hash = Name::cast(this)->Hash();
return Smi::FromInt(hash);
}
if (IsOddball()) {
uint32_t hash = Oddball::cast(this)->to_string()->Hash();
return Smi::FromInt(hash);
}
if (IsSimd128Value()) {
uint32_t hash = Simd128Value::cast(this)->Hash();
return Smi::FromInt(hash & Smi::kMaxValue);
}
DCHECK(IsJSReceiver());
JSReceiver* receiver = JSReceiver::cast(this);
return receiver->GetHeap()->undefined_value();
}
Handle<Smi> Object::GetOrCreateHash(Isolate* isolate, Handle<Object> object) {
Handle<Object> hash(object->GetSimpleHash(), isolate);
if (hash->IsSmi()) return Handle<Smi>::cast(hash);
DCHECK(object->IsJSReceiver());
return JSReceiver::GetOrCreateIdentityHash(Handle<JSReceiver>::cast(object));
}
bool Object::SameValue(Object* other) {
if (other == this) return true;
// The object is either a number, a name, an odd-ball,
// a real JS object, or a Harmony proxy.
if (IsNumber() && other->IsNumber()) {
double this_value = Number();
double other_value = other->Number();
// SameValue(NaN, NaN) is true.
if (this_value != other_value) {
return std::isnan(this_value) && std::isnan(other_value);
}
// SameValue(0.0, -0.0) is false.
return (std::signbit(this_value) == std::signbit(other_value));
}
if (IsString() && other->IsString()) {
return String::cast(this)->Equals(String::cast(other));
}
if (IsFloat32x4() && other->IsFloat32x4()) {
Float32x4* a = Float32x4::cast(this);
Float32x4* b = Float32x4::cast(other);
for (int i = 0; i < 4; i++) {
float x = a->get_lane(i);
float y = b->get_lane(i);
// Implements the ES5 SameValue operation for floating point types.
// http://www.ecma-international.org/ecma-262/6.0/#sec-samevalue
if (x != y && !(std::isnan(x) && std::isnan(y))) return false;
if (std::signbit(x) != std::signbit(y)) return false;
}
return true;
} else if (IsSimd128Value() && other->IsSimd128Value()) {
Simd128Value* a = Simd128Value::cast(this);
Simd128Value* b = Simd128Value::cast(other);
return a->map() == b->map() && a->BitwiseEquals(b);
}
return false;
}
bool Object::SameValueZero(Object* other) {
if (other == this) return true;
// The object is either a number, a name, an odd-ball,
// a real JS object, or a Harmony proxy.
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 (IsFloat32x4() && other->IsFloat32x4()) {
Float32x4* a = Float32x4::cast(this);
Float32x4* b = Float32x4::cast(other);
for (int i = 0; i < 4; i++) {
float x = a->get_lane(i);
float y = b->get_lane(i);
// Implements the ES6 SameValueZero operation for floating point types.
// http://www.ecma-international.org/ecma-262/6.0/#sec-samevaluezero
if (x != y && !(std::isnan(x) && std::isnan(y))) return false;
// SameValueZero doesn't distinguish between 0 and -0.
}
return true;
} else if (IsSimd128Value() && other->IsSimd128Value()) {
Simd128Value* a = Simd128Value::cast(this);
Simd128Value* b = Simd128Value::cast(other);
return a->map() == b->map() && a->BitwiseEquals(b);
}
return false;
}
MaybeHandle<Object> Object::ArraySpeciesConstructor(
Isolate* isolate, Handle<Object> original_array) {
Handle<Context> native_context = isolate->native_context();
Handle<Object> default_species = isolate->array_function();
if (!FLAG_harmony_species) {
return default_species;
}
if (original_array->IsJSArray() &&
Handle<JSReceiver>::cast(original_array)->map()->new_target_is_base() &&
isolate->IsArraySpeciesLookupChainIntact()) {
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(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 != *native_context &&
*constructor == constructor_context->array_function()) {
constructor = isolate->factory()->undefined_value();
}
}
if (constructor->IsJSReceiver()) {
ASSIGN_RETURN_ON_EXCEPTION(
isolate, constructor,
Object::GetProperty(constructor,
isolate->factory()->species_symbol()),
Object);
if (constructor->IsNull()) {
constructor = isolate->factory()->undefined_value();
}
}
}
if (constructor->IsUndefined()) {
return default_species;
} else {
if (!constructor->IsConstructor()) {
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kSpeciesNotConstructor),
Object);
}
return constructor;
}
}
void Object::ShortPrint(FILE* out) {
OFStream os(out);
os << Brief(this);
}
void Object::ShortPrint(StringStream* accumulator) {
std::ostringstream os;
os << Brief(this);
accumulator->Add(os.str().c_str());
}
void Object::ShortPrint(std::ostream& os) { os << Brief(this); }
std::ostream& operator<<(std::ostream& os, const Brief& v) {
if (v.value->IsSmi()) {
Smi::cast(v.value)->SmiPrint(os);
} else {
// TODO(svenpanne) Const-correct HeapObjectShortPrint!
HeapObject* obj = const_cast<HeapObject*>(HeapObject::cast(v.value));
obj->HeapObjectShortPrint(os);
}
return os;
}
void Smi::SmiPrint(std::ostream& os) const { // NOLINT
os << value();
}
// Should a word be prefixed by 'a' or 'an' in order to read naturally in
// English? Returns false for non-ASCII or words that don't start with
// a capital letter. The a/an rule follows pronunciation in English.
// We don't use the BBC's overcorrect "an historic occasion" though if
// you speak a dialect you may well say "an 'istoric occasion".
static bool AnWord(String* str) {
if (str->length() == 0) return false; // A nothing.
int c0 = str->Get(0);
int c1 = str->length() > 1 ? str->Get(1) : 0;
if (c0 == 'U') {
if (c1 > 'Z') {
return true; // An Umpire, but a UTF8String, a U.
}
} else if (c0 == 'A' || c0 == 'E' || c0 == 'I' || c0 == 'O') {
return true; // An Ape, an ABCBook.
} else if ((c1 == 0 || (c1 >= 'A' && c1 <= 'Z')) &&
(c0 == 'F' || c0 == 'H' || c0 == 'M' || c0 == 'N' || c0 == 'R' ||
c0 == 'S' || c0 == 'X')) {
return true; // An MP3File, an M.
}
return false;
}
Handle<String> String::SlowFlatten(Handle<ConsString> cons,
PretenureFlag pretenure) {
DCHECK(AllowHeapAllocation::IsAllowed());
DCHECK(cons->second()->length() != 0);
Isolate* isolate = cons->GetIsolate();
int length = cons->length();
PretenureFlag tenure = isolate->heap()->InNewSpace(*cons) ? pretenure
: TENURED;
Handle<SeqString> result;
if (cons->IsOneByteRepresentation()) {
Handle<SeqOneByteString> flat = isolate->factory()->NewRawOneByteString(
length, tenure).ToHandleChecked();
DisallowHeapAllocation no_gc;
WriteToFlat(*cons, flat->GetChars(), 0, length);
result = flat;
} else {
Handle<SeqTwoByteString> flat = isolate->factory()->NewRawTwoByteString(
length, tenure).ToHandleChecked();
DisallowHeapAllocation no_gc;
WriteToFlat(*cons, flat->GetChars(), 0, length);
result = flat;
}
cons->set_first(*result);
cons->set_second(isolate->heap()->empty_string());
DCHECK(result->IsFlat());
return result;
}
bool String::MakeExternal(v8::String::ExternalStringResource* resource) {
// Externalizing twice leaks the external resource, so it's
// prohibited by the API.
DCHECK(!this->IsExternalString());
DCHECK(!resource->IsCompressible());
#ifdef ENABLE_SLOW_DCHECKS
if (FLAG_enable_slow_asserts) {
// Assert that the resource and the string are equivalent.
DCHECK(static_cast<size_t>(this->length()) == resource->length());
ScopedVector<uc16> smart_chars(this->length());
String::WriteToFlat(this, smart_chars.start(), 0, this->length());
DCHECK(memcmp(smart_chars.start(),
resource->data(),
resource->length() * sizeof(smart_chars[0])) == 0);
}
#endif // DEBUG
int size = this->Size(); // Byte size of the original string.
// Abort if size does not allow in-place conversion.
if (size < ExternalString::kShortSize) return false;
Heap* heap = GetHeap();
bool is_one_byte = this->IsOneByteRepresentation();
bool is_internalized = this->IsInternalizedString();
// Morph the string to an external string by replacing the map and
// reinitializing the fields. This won't work if the space the existing
// string occupies is too small for a regular external string.
// Instead, we resort to a short external string instead, omitting
// the field caching the address of the backing store. When we encounter
// short external strings in generated code, we need to bailout to runtime.
Map* new_map;
if (size < ExternalString::kSize) {
new_map = is_internalized
? (is_one_byte
? heap->short_external_internalized_string_with_one_byte_data_map()
: heap->short_external_internalized_string_map())
: (is_one_byte ? heap->short_external_string_with_one_byte_data_map()
: heap->short_external_string_map());
} else {
new_map = is_internalized
? (is_one_byte
? heap->external_internalized_string_with_one_byte_data_map()
: heap->external_internalized_string_map())
: (is_one_byte ? heap->external_string_with_one_byte_data_map()
: heap->external_string_map());
}
// Byte size of the external String object.
int new_size = this->SizeFromMap(new_map);
heap->CreateFillerObjectAt(this->address() + new_size, size - new_size);
// We are storing the new map using release store after creating a filler for
// the left-over space to avoid races with the sweeper thread.
this->synchronized_set_map(new_map);
ExternalTwoByteString* self = ExternalTwoByteString::cast(this);
self->set_resource(resource);
if (is_internalized) self->Hash(); // Force regeneration of the hash value.
heap->AdjustLiveBytes(this, new_size - size, Heap::CONCURRENT_TO_SWEEPER);
return true;
}
bool String::MakeExternal(v8::String::ExternalOneByteStringResource* resource) {
// Externalizing twice leaks the external resource, so it's
// prohibited by the API.
DCHECK(!this->IsExternalString());
DCHECK(!resource->IsCompressible());
#ifdef ENABLE_SLOW_DCHECKS
if (FLAG_enable_slow_asserts) {
// Assert that the resource and the string are equivalent.
DCHECK(static_cast<size_t>(this->length()) == resource->length());
if (this->IsTwoByteRepresentation()) {
ScopedVector<uint16_t> smart_chars(this->length());
String::WriteToFlat(this, smart_chars.start(), 0, this->length());
DCHECK(String::IsOneByte(smart_chars.start(), this->length()));
}
ScopedVector<char> smart_chars(this->length());
String::WriteToFlat(this, smart_chars.start(), 0, this->length());
DCHECK(memcmp(smart_chars.start(),
resource->data(),
resource->length() * sizeof(smart_chars[0])) == 0);
}
#endif // DEBUG
int size = this->Size(); // Byte size of the original string.
// Abort if size does not allow in-place conversion.
if (size < ExternalString::kShortSize) return false;
Heap* heap = GetHeap();
bool is_internalized = this->IsInternalizedString();
// Morph the string to an external string by replacing the map and
// reinitializing the fields. This won't work if the space the existing
// string occupies is too small for a regular external string.
// Instead, we resort to a short external string instead, omitting
// the field caching the address of the backing store. When we encounter
// short external strings in generated code, we need to bailout to runtime.
Map* new_map;
if (size < ExternalString::kSize) {
new_map = is_internalized
? heap->short_external_one_byte_internalized_string_map()
: heap->short_external_one_byte_string_map();
} else {
new_map = is_internalized
? heap->external_one_byte_internalized_string_map()
: heap->external_one_byte_string_map();
}
// Byte size of the external String object.
int new_size = this->SizeFromMap(new_map);
heap->CreateFillerObjectAt(this->address() + new_size, size - new_size);
// We are storing the new map using release store after creating a filler for
// the left-over space to avoid races with the sweeper thread.
this->synchronized_set_map(new_map);
ExternalOneByteString* self = ExternalOneByteString::cast(this);
self->set_resource(resource);
if (is_internalized) self->Hash(); // Force regeneration of the hash value.
heap->AdjustLiveBytes(this, new_size - size, Heap::CONCURRENT_TO_SWEEPER);
return true;
}
void String::StringShortPrint(StringStream* accumulator) {
int len = length();
if (len > kMaxShortPrintLength) {
accumulator->Add("<Very long string[%u]>", len);
return;
}
if (!LooksValid()) {
accumulator->Add("<Invalid String>");
return;
}
StringCharacterStream stream(this);
bool truncated = false;
if (len > kMaxShortPrintLength) {
len = kMaxShortPrintLength;
truncated = true;
}
bool one_byte = true;
for (int i = 0; i < len; i++) {
uint16_t c = stream.GetNext();
if (c < 32 || c >= 127) {
one_byte = false;
}
}
stream.Reset(this);
if (one_byte) {
accumulator->Add("<String[%u]: ", length());
for (int i = 0; i < len; i++) {
accumulator->Put(static_cast<char>(stream.GetNext()));
}
accumulator->Put('>');
} else {
// Backslash indicates that the string contains control
// characters and that backslashes are therefore escaped.
accumulator->Add("<String[%u]\\: ", length());
for (int i = 0; i < len; i++) {
uint16_t c = stream.GetNext();
if (c == '\n') {
accumulator->Add("\\n");
} else if (c == '\r') {
accumulator->Add("\\r");
} else if (c == '\\') {
accumulator->Add("\\\\");
} else if (c < 32 || c > 126) {
accumulator->Add("\\x%02x", c);
} else {
accumulator->Put(static_cast<char>(c));
}
}
if (truncated) {
accumulator->Put('.');
accumulator->Put('.');
accumulator->Put('.');
}
accumulator->Put('>');
}
return;
}
void String::PrintUC16(std::ostream& os, int start, int end) { // NOLINT
if (end < 0) end = length();
StringCharacterStream stream(this, start);
for (int i = start; i < end && stream.HasMore(); i++) {
os << AsUC16(stream.GetNext());
}
}
void JSObject::JSObjectShortPrint(StringStream* accumulator) {
switch (map()->instance_type()) {
case JS_ARRAY_TYPE: {
double length = JSArray::cast(this)->length()->IsUndefined()
? 0
: JSArray::cast(this)->length()->Number();
accumulator->Add("<JS Array[%u]>", static_cast<uint32_t>(length));
break;
}
case JS_BOUND_FUNCTION_TYPE: {
JSBoundFunction* bound_function = JSBoundFunction::cast(this);
Object* name = bound_function->name();
accumulator->Add("<JS BoundFunction");
if (name->IsString()) {
String* str = String::cast(name);
if (str->length() > 0) {
accumulator->Add(" ");
accumulator->Put(str);
}
}
accumulator->Add(
" (BoundTargetFunction %p)>",
reinterpret_cast<void*>(bound_function->bound_target_function()));
break;
}
case JS_WEAK_MAP_TYPE: {
accumulator->Add("<JS WeakMap>");
break;
}
case JS_WEAK_SET_TYPE: {
accumulator->Add("<JS WeakSet>");
break;
}
case JS_REGEXP_TYPE: {
accumulator->Add("<JS RegExp>");
break;
}
case JS_FUNCTION_TYPE: {
JSFunction* function = JSFunction::cast(this);
Object* fun_name = function->shared()->DebugName();
bool printed = false;
if (fun_name->IsString()) {
String* str = String::cast(fun_name);
if (str->length() > 0) {
accumulator->Add("<JS Function ");
accumulator->Put(str);
printed = true;
}
}
if (!printed) {
accumulator->Add("<JS Function");
}
accumulator->Add(" (SharedFunctionInfo %p)",
reinterpret_cast<void*>(function->shared()));
accumulator->Put('>');
break;
}
case JS_GENERATOR_OBJECT_TYPE: {
accumulator->Add("<JS Generator>");
break;
}
case JS_MODULE_TYPE: {
accumulator->Add("<JS Module>");
break;
}
// All other JSObjects are rather similar to each other (JSObject,
// JSGlobalProxy, JSGlobalObject, JSUndetectableObject, JSValue).
default: {
Map* map_of_this = map();
Heap* heap = GetHeap();
Object* constructor = map_of_this->GetConstructor();
bool printed = false;
if (constructor->IsHeapObject() &&
!heap->Contains(HeapObject::cast(constructor))) {
accumulator->Add("!!!INVALID CONSTRUCTOR!!!");
} else {
bool global_object = IsJSGlobalProxy();
if (constructor->IsJSFunction()) {
if (!heap->Contains(JSFunction::cast(constructor)->shared())) {
accumulator->Add("!!!INVALID SHARED ON CONSTRUCTOR!!!");
} else {
Object* constructor_name =
JSFunction::cast(constructor)->shared()->name();
if (constructor_name->IsString()) {
String* str = String::cast(constructor_name);
if (str->length() > 0) {
bool vowel = AnWord(str);
accumulator->Add("<%sa%s ",
global_object ? "Global Object: " : "",
vowel ? "n" : "");
accumulator->Put(str);
accumulator->Add(" with %smap %p",
map_of_this->is_deprecated() ? "deprecated " : "",
map_of_this);
printed = true;
}
}
}
}
if (!printed) {
accumulator->Add("<JS %sObject", global_object ? "Global " : "");
}
}
if (IsJSValue()) {
accumulator->Add(" value = ");
JSValue::cast(this)->value()->ShortPrint(accumulator);
}
accumulator->Put('>');
break;
}
}
}
void JSObject::PrintElementsTransition(
FILE* file, Handle<JSObject> object,
ElementsKind from_kind, Handle<FixedArrayBase> from_elements,
ElementsKind to_kind, Handle<FixedArrayBase> to_elements) {
if (from_kind != to_kind) {
OFStream os(file);
os << "elements transition [" << ElementsKindToString(from_kind) << " -> "
<< ElementsKindToString(to_kind) << "] in ";
JavaScriptFrame::PrintTop(object->GetIsolate(), file, false, true);
PrintF(file, " for ");
object->ShortPrint(file);
PrintF(file, " from ");
from_elements->ShortPrint(file);
PrintF(file, " to ");
to_elements->ShortPrint(file);
PrintF(file, "\n");
}
}
// static
MaybeHandle<JSFunction> Map::GetConstructorFunction(
Handle<Map> map, Handle<Context> native_context) {
if (map->IsPrimitiveMap()) {
int const constructor_function_index = map->GetConstructorFunctionIndex();
if (constructor_function_index != kNoConstructorFunctionIndex) {
return handle(
JSFunction::cast(native_context->get(constructor_function_index)));
}
}
return MaybeHandle<JSFunction>();
}
void Map::PrintReconfiguration(FILE* file, int modify_index, PropertyKind kind,
PropertyAttributes attributes) {
OFStream os(file);
os << "[reconfiguring]";
Name* name = instance_descriptors()->GetKey(modify_index);
if (name->IsString()) {
String::cast(name)->PrintOn(file);
} else {
os << "{symbol " << static_cast<void*>(name) << "}";
}
os << ": " << (kind == kData ? "kData" : "ACCESSORS") << ", attrs: ";
os << attributes << " [";
JavaScriptFrame::PrintTop(GetIsolate(), file, false, true);
os << "]\n";
}
void Map::PrintGeneralization(
FILE* file, const char* reason, int modify_index, int split,
int descriptors, bool constant_to_field, Representation old_representation,
Representation new_representation, MaybeHandle<FieldType> old_field_type,
MaybeHandle<Object> old_value, MaybeHandle<FieldType> new_field_type,
MaybeHandle<Object> new_value) {
OFStream os(file);
os << "[generalizing]";
Name* name = instance_descriptors()->GetKey(modify_index);
if (name->IsString()) {
String::cast(name)->PrintOn(file);
} else {
os << "{symbol " << static_cast<void*>(name) << "}";
}
os << ":";
if (constant_to_field) {
os << "c";
} else {
os << old_representation.Mnemonic() << "{";
if (old_field_type.is_null()) {
os << Brief(*(old_value.ToHandleChecked()));
} else {
old_field_type.ToHandleChecked()->PrintTo(os);
}
os << "}";
}
os << "->" << new_representation.Mnemonic() << "{";
if (new_field_type.is_null()) {
os << Brief(*(new_value.ToHandleChecked()));
} else {
new_field_type.ToHandleChecked()->PrintTo(os);
}
os << "} (";
if (strlen(reason) > 0) {
os << reason;
} else {
os << "+" << (descriptors - split) << " maps";
}
os << ") [";
JavaScriptFrame::PrintTop(GetIsolate(), file, false, true);
os << "]\n";
}
void JSObject::PrintInstanceMigration(FILE* file,
Map* original_map,
Map* new_map) {
PrintF(file, "[migrating]");
DescriptorArray* o = original_map->instance_descriptors();
DescriptorArray* n = new_map->instance_descriptors();
for (int i = 0; i < original_map->NumberOfOwnDescriptors(); i++) {
Representation o_r = o->GetDetails(i).representation();
Representation n_r = n->GetDetails(i).representation();
if (!o_r.Equals(n_r)) {
String::cast(o->GetKey(i))->PrintOn(file);
PrintF(file, ":%s->%s ", o_r.Mnemonic(), n_r.Mnemonic());
} else if (o->GetDetails(i).type() == DATA_CONSTANT &&
n->GetDetails(i).type() == DATA) {
Name* name = o->GetKey(i);
if (name->IsString()) {
String::cast(name)->PrintOn(file);
} else {
PrintF(file, "{symbol %p}", static_cast<void*>(name));
}
PrintF(file, " ");
}
}
PrintF(file, "\n");
}
void HeapObject::HeapObjectShortPrint(std::ostream& os) { // NOLINT
Heap* heap = GetHeap();
if (!heap->Contains(this)) {
os << "!!!INVALID POINTER!!!";
return;
}
if (!heap->Contains(map())) {
os << "!!!INVALID MAP!!!";
return;
}
os << this << " ";
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(" << ElementsKindToString(Map::cast(this)->elements_kind())
<< ")>";
break;
case FIXED_ARRAY_TYPE:
os << "<FixedArray[" << 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 TRANSITION_ARRAY_TYPE:
os << "<TransitionArray[" << TransitionArray::cast(this)->length()
<< "]>";
break;
case FREE_SPACE_TYPE:
os << "<FreeSpace[" << FreeSpace::cast(this)->size() << "]>";
break;
#define TYPED_ARRAY_SHORT_PRINT(Type, type, TYPE, ctype, size) \
case FIXED_##TYPE##_ARRAY_TYPE: \
os << "<Fixed" #Type "Array[" << Fixed##Type##Array::cast(this)->length() \
<< "]>"; \
break;
TYPED_ARRAYS(TYPED_ARRAY_SHORT_PRINT)
#undef TYPED_ARRAY_SHORT_PRINT
case SHARED_FUNCTION_INFO_TYPE: {
SharedFunctionInfo* shared = SharedFunctionInfo::cast(this);
base::SmartArrayPointer<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(NAME, Name, name) \
case NAME##_TYPE: \
os << "<" #Name ">"; \
break;
STRUCT_LIST(MAKE_STRUCT_CASE)
#undef MAKE_STRUCT_CASE
case CODE_TYPE: {
Code* code = Code::cast(this);
os << "<Code: " << Code::Kind2String(code->kind()) << ">";
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>";
}
break;
}
case SYMBOL_TYPE: {
Symbol* symbol = Symbol::cast(this);
symbol->SymbolShortPrint(os);
break;
}
case HEAP_NUMBER_TYPE: {
os << "<Number: ";
HeapNumber::cast(this)->HeapNumberPrint(os);
os << ">";
break;
}
case MUTABLE_HEAP_NUMBER_TYPE: {
os << "<MutableNumber: ";
HeapNumber::cast(this)->HeapNumberPrint(os);
os << '>';
break;
}
case SIMD128_VALUE_TYPE: {
#define SIMD128_TYPE(TYPE, Type, type, lane_count, lane_type) \
if (Is##Type()) { \
os << "<" #Type ">"; \
break; \
}
SIMD128_TYPES(SIMD128_TYPE)
#undef SIMD128_TYPE
UNREACHABLE();
break;
}
case JS_PROXY_TYPE:
os << "<JSProxy>";
break;
case FOREIGN_TYPE:
os << "<Foreign>";
break;
case CELL_TYPE: {
os << "Cell for ";
HeapStringAllocator allocator;
StringStream accumulator(&allocator);
Cell::cast(this)->value()->ShortPrint(&accumulator);
os << accumulator.ToCString().get();
break;
}
case PROPERTY_CELL_TYPE: {
os << "PropertyCell for ";
HeapStringAllocator allocator;
StringStream accumulator(&allocator);
PropertyCell* cell = PropertyCell::cast(this);
cell->value()->ShortPrint(&accumulator);
os << accumulator.ToCString().get();
break;
}
case WEAK_CELL_TYPE: {
os << "WeakCell for ";
HeapStringAllocator allocator;
StringStream accumulator(&allocator);
WeakCell::cast(this)->value()->ShortPrint(&accumulator);
os << accumulator.ToCString().get();
break;
}
default:
os << "<Other heap object (" << map()->instance_type() << ")>";
break;
}
}
void HeapObject::Iterate(ObjectVisitor* v) { IterateFast<ObjectVisitor>(v); }
void HeapObject::IterateBody(ObjectVisitor* v) {
Map* m = map();
IterateBodyFast<ObjectVisitor>(m->instance_type(), SizeFromMap(m), v);
}
void HeapObject::IterateBody(InstanceType type, int object_size,
ObjectVisitor* v) {
IterateBodyFast<ObjectVisitor>(type, object_size, v);
}
struct CallIsValidSlot {
template <typename BodyDescriptor>
static bool apply(HeapObject* obj, int offset, int) {
return BodyDescriptor::IsValidSlot(obj, offset);
}
};
bool HeapObject::IsValidSlot(int offset) {
DCHECK_NE(0, offset);
return BodyDescriptorApply<CallIsValidSlot, bool>(map()->instance_type(),
this, offset, 0);
}
bool HeapNumber::HeapNumberBooleanValue() {
return DoubleToBoolean(value());
}
void HeapNumber::HeapNumberPrint(std::ostream& os) { // NOLINT
os << value();
}
#define FIELD_ADDR_CONST(p, offset) \
(reinterpret_cast<const byte*>(p) + offset - kHeapObjectTag)
#define READ_INT32_FIELD(p, offset) \
(*reinterpret_cast<const int32_t*>(FIELD_ADDR_CONST(p, offset)))
#define READ_INT64_FIELD(p, offset) \
(*reinterpret_cast<const int64_t*>(FIELD_ADDR_CONST(p, offset)))
#define READ_BYTE_FIELD(p, offset) \
(*reinterpret_cast<const byte*>(FIELD_ADDR_CONST(p, offset)))
// static
Handle<String> Simd128Value::ToString(Handle<Simd128Value> input) {
#define SIMD128_TYPE(TYPE, Type, type, lane_count, lane_type) \
if (input->Is##Type()) return Type::ToString(Handle<Type>::cast(input));
SIMD128_TYPES(SIMD128_TYPE)
#undef SIMD128_TYPE
UNREACHABLE();
return Handle<String>::null();
}
// static
Handle<String> Float32x4::ToString(Handle<Float32x4> input) {
Isolate* const isolate = input->GetIsolate();
char arr[100];
Vector<char> buffer(arr, arraysize(arr));
std::ostringstream os;
os << "SIMD.Float32x4("
<< std::string(DoubleToCString(input->get_lane(0), buffer)) << ", "
<< std::string(DoubleToCString(input->get_lane(1), buffer)) << ", "
<< std::string(DoubleToCString(input->get_lane(2), buffer)) << ", "
<< std::string(DoubleToCString(input->get_lane(3), buffer)) << ")";
return isolate->factory()->NewStringFromAsciiChecked(os.str().c_str());
}
#define SIMD128_BOOL_TO_STRING(Type, lane_count) \
Handle<String> Type::ToString(Handle<Type> input) { \
Isolate* const isolate = input->GetIsolate(); \
std