e24dd86858
BUG=v8:7490 Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng Change-Id: I83061dac1b255b239738f900b5149828bd2203ec Reviewed-on: https://chromium-review.googlesource.com/1061496 Reviewed-by: Michael Starzinger <mstarzinger@chromium.org> Reviewed-by: Igor Sheludko <ishell@chromium.org> Commit-Queue: Marja Hölttä <marja@chromium.org> Cr-Commit-Position: refs/heads/master@{#53237}
946 lines
30 KiB
C++
946 lines
30 KiB
C++
// Copyright 2016 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/json-parser.h"
|
|
|
|
#include "src/char-predicates-inl.h"
|
|
#include "src/conversions.h"
|
|
#include "src/debug/debug.h"
|
|
#include "src/field-type.h"
|
|
#include "src/messages.h"
|
|
#include "src/objects-inl.h"
|
|
#include "src/objects/hash-table-inl.h"
|
|
#include "src/property-descriptor.h"
|
|
#include "src/string-hasher.h"
|
|
#include "src/transitions.h"
|
|
#include "src/unicode-cache.h"
|
|
|
|
namespace v8 {
|
|
namespace internal {
|
|
|
|
namespace {
|
|
|
|
// A vector-like data structure that uses a larger vector for allocation, and
|
|
// provides limited utility access. The original vector must not be used for the
|
|
// duration, and it may even be reallocated. This allows vector storage to be
|
|
// reused for the properties of sibling objects.
|
|
template <typename Container>
|
|
class VectorSegment {
|
|
public:
|
|
using value_type = typename Container::value_type;
|
|
|
|
explicit VectorSegment(Container* container)
|
|
: container_(*container), begin_(container->size()) {}
|
|
~VectorSegment() { container_.resize(begin_); }
|
|
|
|
Vector<const value_type> GetVector() const {
|
|
return Vector<const value_type>(container_.data() + begin_,
|
|
container_.size() - begin_);
|
|
}
|
|
|
|
template <typename T>
|
|
void push_back(T&& value) {
|
|
container_.push_back(std::forward<T>(value));
|
|
}
|
|
|
|
private:
|
|
Container& container_;
|
|
const typename Container::size_type begin_;
|
|
};
|
|
|
|
} // namespace
|
|
|
|
MaybeHandle<Object> JsonParseInternalizer::Internalize(Isolate* isolate,
|
|
Handle<Object> object,
|
|
Handle<Object> reviver) {
|
|
DCHECK(reviver->IsCallable());
|
|
JsonParseInternalizer internalizer(isolate,
|
|
Handle<JSReceiver>::cast(reviver));
|
|
Handle<JSObject> holder =
|
|
isolate->factory()->NewJSObject(isolate->object_function());
|
|
Handle<String> name = isolate->factory()->empty_string();
|
|
JSObject::AddProperty(holder, name, object, NONE);
|
|
return internalizer.InternalizeJsonProperty(holder, name);
|
|
}
|
|
|
|
MaybeHandle<Object> JsonParseInternalizer::InternalizeJsonProperty(
|
|
Handle<JSReceiver> holder, Handle<String> name) {
|
|
HandleScope outer_scope(isolate_);
|
|
Handle<Object> value;
|
|
ASSIGN_RETURN_ON_EXCEPTION(
|
|
isolate_, value, Object::GetPropertyOrElement(holder, name), Object);
|
|
if (value->IsJSReceiver()) {
|
|
Handle<JSReceiver> object = Handle<JSReceiver>::cast(value);
|
|
Maybe<bool> is_array = Object::IsArray(object);
|
|
if (is_array.IsNothing()) return MaybeHandle<Object>();
|
|
if (is_array.FromJust()) {
|
|
Handle<Object> length_object;
|
|
ASSIGN_RETURN_ON_EXCEPTION(
|
|
isolate_, length_object,
|
|
Object::GetLengthFromArrayLike(isolate_, object), Object);
|
|
double length = length_object->Number();
|
|
for (double i = 0; i < length; i++) {
|
|
HandleScope inner_scope(isolate_);
|
|
Handle<Object> index = isolate_->factory()->NewNumber(i);
|
|
Handle<String> name = isolate_->factory()->NumberToString(index);
|
|
if (!RecurseAndApply(object, name)) return MaybeHandle<Object>();
|
|
}
|
|
} else {
|
|
Handle<FixedArray> contents;
|
|
ASSIGN_RETURN_ON_EXCEPTION(
|
|
isolate_, contents,
|
|
KeyAccumulator::GetKeys(object, KeyCollectionMode::kOwnOnly,
|
|
ENUMERABLE_STRINGS,
|
|
GetKeysConversion::kConvertToString),
|
|
Object);
|
|
for (int i = 0; i < contents->length(); i++) {
|
|
HandleScope inner_scope(isolate_);
|
|
Handle<String> name(String::cast(contents->get(i)), isolate_);
|
|
if (!RecurseAndApply(object, name)) return MaybeHandle<Object>();
|
|
}
|
|
}
|
|
}
|
|
Handle<Object> argv[] = {name, value};
|
|
Handle<Object> result;
|
|
ASSIGN_RETURN_ON_EXCEPTION(
|
|
isolate_, result, Execution::Call(isolate_, reviver_, holder, 2, argv),
|
|
Object);
|
|
return outer_scope.CloseAndEscape(result);
|
|
}
|
|
|
|
bool JsonParseInternalizer::RecurseAndApply(Handle<JSReceiver> holder,
|
|
Handle<String> name) {
|
|
STACK_CHECK(isolate_, false);
|
|
|
|
Handle<Object> result;
|
|
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
|
|
isolate_, result, InternalizeJsonProperty(holder, name), false);
|
|
Maybe<bool> change_result = Nothing<bool>();
|
|
if (result->IsUndefined(isolate_)) {
|
|
change_result = JSReceiver::DeletePropertyOrElement(holder, name,
|
|
LanguageMode::kSloppy);
|
|
} else {
|
|
PropertyDescriptor desc;
|
|
desc.set_value(result);
|
|
desc.set_configurable(true);
|
|
desc.set_enumerable(true);
|
|
desc.set_writable(true);
|
|
change_result = JSReceiver::DefineOwnProperty(isolate_, holder, name, &desc,
|
|
kDontThrow);
|
|
}
|
|
MAYBE_RETURN(change_result, false);
|
|
return true;
|
|
}
|
|
|
|
template <bool seq_one_byte>
|
|
JsonParser<seq_one_byte>::JsonParser(Isolate* isolate, Handle<String> source)
|
|
: source_(source),
|
|
source_length_(source->length()),
|
|
isolate_(isolate),
|
|
zone_(isolate_->allocator(), ZONE_NAME),
|
|
object_constructor_(isolate_->native_context()->object_function(),
|
|
isolate_),
|
|
position_(-1),
|
|
properties_(&zone_) {
|
|
source_ = String::Flatten(source_);
|
|
pretenure_ = (source_length_ >= kPretenureTreshold) ? TENURED : NOT_TENURED;
|
|
|
|
// Optimized fast case where we only have Latin1 characters.
|
|
if (seq_one_byte) {
|
|
seq_source_ = Handle<SeqOneByteString>::cast(source_);
|
|
}
|
|
}
|
|
|
|
template <bool seq_one_byte>
|
|
MaybeHandle<Object> JsonParser<seq_one_byte>::ParseJson() {
|
|
// Advance to the first character (possibly EOS)
|
|
AdvanceSkipWhitespace();
|
|
Handle<Object> result = ParseJsonValue();
|
|
if (result.is_null() || c0_ != kEndOfString) {
|
|
// Some exception (for example stack overflow) is already pending.
|
|
if (isolate_->has_pending_exception()) return Handle<Object>::null();
|
|
|
|
// Parse failed. Current character is the unexpected token.
|
|
Factory* factory = this->factory();
|
|
MessageTemplate::Template message;
|
|
Handle<Object> arg1 = Handle<Smi>(Smi::FromInt(position_), isolate());
|
|
Handle<Object> arg2;
|
|
|
|
switch (c0_) {
|
|
case kEndOfString:
|
|
message = MessageTemplate::kJsonParseUnexpectedEOS;
|
|
break;
|
|
case '-':
|
|
case '0':
|
|
case '1':
|
|
case '2':
|
|
case '3':
|
|
case '4':
|
|
case '5':
|
|
case '6':
|
|
case '7':
|
|
case '8':
|
|
case '9':
|
|
message = MessageTemplate::kJsonParseUnexpectedTokenNumber;
|
|
break;
|
|
case '"':
|
|
message = MessageTemplate::kJsonParseUnexpectedTokenString;
|
|
break;
|
|
default:
|
|
message = MessageTemplate::kJsonParseUnexpectedToken;
|
|
arg2 = arg1;
|
|
arg1 = factory->LookupSingleCharacterStringFromCode(c0_);
|
|
break;
|
|
}
|
|
|
|
Handle<Script> script(factory->NewScript(source_));
|
|
if (isolate()->NeedsSourcePositionsForProfiling()) {
|
|
Script::InitLineEnds(script);
|
|
}
|
|
// We should sent compile error event because we compile JSON object in
|
|
// separated source file.
|
|
isolate()->debug()->OnCompileError(script);
|
|
MessageLocation location(script, position_, position_ + 1);
|
|
Handle<Object> error = factory->NewSyntaxError(message, arg1, arg2);
|
|
return isolate()->template Throw<Object>(error, &location);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
MaybeHandle<Object> InternalizeJsonProperty(Handle<JSObject> holder,
|
|
Handle<String> key);
|
|
|
|
template <bool seq_one_byte>
|
|
void JsonParser<seq_one_byte>::Advance() {
|
|
position_++;
|
|
if (position_ >= source_length_) {
|
|
c0_ = kEndOfString;
|
|
} else if (seq_one_byte) {
|
|
c0_ = seq_source_->SeqOneByteStringGet(position_);
|
|
} else {
|
|
c0_ = source_->Get(position_);
|
|
}
|
|
}
|
|
|
|
template <bool seq_one_byte>
|
|
void JsonParser<seq_one_byte>::AdvanceSkipWhitespace() {
|
|
do {
|
|
Advance();
|
|
} while (c0_ == ' ' || c0_ == '\t' || c0_ == '\n' || c0_ == '\r');
|
|
}
|
|
|
|
template <bool seq_one_byte>
|
|
void JsonParser<seq_one_byte>::SkipWhitespace() {
|
|
while (c0_ == ' ' || c0_ == '\t' || c0_ == '\n' || c0_ == '\r') {
|
|
Advance();
|
|
}
|
|
}
|
|
|
|
template <bool seq_one_byte>
|
|
uc32 JsonParser<seq_one_byte>::AdvanceGetChar() {
|
|
Advance();
|
|
return c0_;
|
|
}
|
|
|
|
template <bool seq_one_byte>
|
|
bool JsonParser<seq_one_byte>::MatchSkipWhiteSpace(uc32 c) {
|
|
if (c0_ == c) {
|
|
AdvanceSkipWhitespace();
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
template <bool seq_one_byte>
|
|
bool JsonParser<seq_one_byte>::ParseJsonString(Handle<String> expected) {
|
|
int length = expected->length();
|
|
if (source_->length() - position_ - 1 > length) {
|
|
DisallowHeapAllocation no_gc;
|
|
String::FlatContent content = expected->GetFlatContent();
|
|
if (content.IsOneByte()) {
|
|
DCHECK_EQ('"', c0_);
|
|
const uint8_t* input_chars = seq_source_->GetChars() + position_ + 1;
|
|
const uint8_t* expected_chars = content.ToOneByteVector().start();
|
|
for (int i = 0; i < length; i++) {
|
|
uint8_t c0 = input_chars[i];
|
|
if (c0 != expected_chars[i] || c0 == '"' || c0 < 0x20 || c0 == '\\') {
|
|
return false;
|
|
}
|
|
}
|
|
if (input_chars[length] == '"') {
|
|
position_ = position_ + length + 1;
|
|
AdvanceSkipWhitespace();
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
// Parse any JSON value.
|
|
template <bool seq_one_byte>
|
|
Handle<Object> JsonParser<seq_one_byte>::ParseJsonValue() {
|
|
StackLimitCheck stack_check(isolate_);
|
|
if (stack_check.HasOverflowed()) {
|
|
isolate_->StackOverflow();
|
|
return Handle<Object>::null();
|
|
}
|
|
|
|
if (stack_check.InterruptRequested() &&
|
|
isolate_->stack_guard()->HandleInterrupts()->IsException(isolate_)) {
|
|
return Handle<Object>::null();
|
|
}
|
|
|
|
if (c0_ == '"') return ParseJsonString();
|
|
if ((c0_ >= '0' && c0_ <= '9') || c0_ == '-') return ParseJsonNumber();
|
|
if (c0_ == '{') return ParseJsonObject();
|
|
if (c0_ == '[') return ParseJsonArray();
|
|
if (c0_ == 'f') {
|
|
if (AdvanceGetChar() == 'a' && AdvanceGetChar() == 'l' &&
|
|
AdvanceGetChar() == 's' && AdvanceGetChar() == 'e') {
|
|
AdvanceSkipWhitespace();
|
|
return factory()->false_value();
|
|
}
|
|
return ReportUnexpectedCharacter();
|
|
}
|
|
if (c0_ == 't') {
|
|
if (AdvanceGetChar() == 'r' && AdvanceGetChar() == 'u' &&
|
|
AdvanceGetChar() == 'e') {
|
|
AdvanceSkipWhitespace();
|
|
return factory()->true_value();
|
|
}
|
|
return ReportUnexpectedCharacter();
|
|
}
|
|
if (c0_ == 'n') {
|
|
if (AdvanceGetChar() == 'u' && AdvanceGetChar() == 'l' &&
|
|
AdvanceGetChar() == 'l') {
|
|
AdvanceSkipWhitespace();
|
|
return factory()->null_value();
|
|
}
|
|
return ReportUnexpectedCharacter();
|
|
}
|
|
return ReportUnexpectedCharacter();
|
|
}
|
|
|
|
template <bool seq_one_byte>
|
|
ParseElementResult JsonParser<seq_one_byte>::ParseElement(
|
|
Handle<JSObject> json_object) {
|
|
uint32_t index = 0;
|
|
// Maybe an array index, try to parse it.
|
|
if (c0_ == '0') {
|
|
// With a leading zero, the string has to be "0" only to be an index.
|
|
Advance();
|
|
} else {
|
|
do {
|
|
int d = c0_ - '0';
|
|
if (index > 429496729U - ((d + 3) >> 3)) break;
|
|
index = (index * 10) + d;
|
|
Advance();
|
|
} while (IsDecimalDigit(c0_));
|
|
}
|
|
|
|
if (c0_ == '"') {
|
|
// Successfully parsed index, parse and store element.
|
|
AdvanceSkipWhitespace();
|
|
|
|
if (c0_ == ':') {
|
|
AdvanceSkipWhitespace();
|
|
Handle<Object> value = ParseJsonValue();
|
|
if (!value.is_null()) {
|
|
JSObject::SetOwnElementIgnoreAttributes(json_object, index, value, NONE)
|
|
.Assert();
|
|
return kElementFound;
|
|
} else {
|
|
return kNullHandle;
|
|
}
|
|
}
|
|
}
|
|
return kElementNotFound;
|
|
}
|
|
|
|
// Parse a JSON object. Position must be right at '{'.
|
|
template <bool seq_one_byte>
|
|
Handle<Object> JsonParser<seq_one_byte>::ParseJsonObject() {
|
|
HandleScope scope(isolate());
|
|
Handle<JSObject> json_object =
|
|
factory()->NewJSObject(object_constructor(), pretenure_);
|
|
Handle<Map> map(json_object->map());
|
|
int descriptor = 0;
|
|
VectorSegment<ZoneVector<Handle<Object>>> properties(&properties_);
|
|
DCHECK_EQ(c0_, '{');
|
|
|
|
bool transitioning = true;
|
|
|
|
AdvanceSkipWhitespace();
|
|
if (c0_ != '}') {
|
|
do {
|
|
if (c0_ != '"') return ReportUnexpectedCharacter();
|
|
|
|
int start_position = position_;
|
|
Advance();
|
|
|
|
if (IsDecimalDigit(c0_)) {
|
|
ParseElementResult element_result = ParseElement(json_object);
|
|
if (element_result == kNullHandle) return Handle<Object>::null();
|
|
if (element_result == kElementFound) continue;
|
|
}
|
|
// Not an index, fallback to the slow path.
|
|
|
|
position_ = start_position;
|
|
#ifdef DEBUG
|
|
c0_ = '"';
|
|
#endif
|
|
|
|
Handle<String> key;
|
|
Handle<Object> value;
|
|
|
|
// Try to follow existing transitions as long as possible. Once we stop
|
|
// transitioning, no transition can be found anymore.
|
|
DCHECK(transitioning);
|
|
// First check whether there is a single expected transition. If so, try
|
|
// to parse it first.
|
|
bool follow_expected = false;
|
|
Handle<Map> target;
|
|
if (seq_one_byte) {
|
|
DisallowHeapAllocation no_gc;
|
|
TransitionsAccessor transitions(*map, &no_gc);
|
|
key = transitions.ExpectedTransitionKey();
|
|
follow_expected = !key.is_null() && ParseJsonString(key);
|
|
// If the expected transition hits, follow it.
|
|
if (follow_expected) {
|
|
target = transitions.ExpectedTransitionTarget();
|
|
}
|
|
}
|
|
if (!follow_expected) {
|
|
// If the expected transition failed, parse an internalized string and
|
|
// try to find a matching transition.
|
|
key = ParseJsonString();
|
|
if (key.is_null()) return ReportUnexpectedCharacter();
|
|
|
|
// If a transition was found, follow it and continue.
|
|
transitioning =
|
|
TransitionsAccessor(map).FindTransitionToField(key).ToHandle(
|
|
&target);
|
|
}
|
|
if (c0_ != ':') return ReportUnexpectedCharacter();
|
|
|
|
AdvanceSkipWhitespace();
|
|
value = ParseJsonValue();
|
|
if (value.is_null()) return ReportUnexpectedCharacter();
|
|
|
|
if (transitioning) {
|
|
PropertyDetails details =
|
|
target->instance_descriptors()->GetDetails(descriptor);
|
|
Representation expected_representation = details.representation();
|
|
|
|
if (value->FitsRepresentation(expected_representation)) {
|
|
if (expected_representation.IsHeapObject() &&
|
|
!target->instance_descriptors()
|
|
->GetFieldType(descriptor)
|
|
->NowContains(value)) {
|
|
Handle<FieldType> value_type(
|
|
value->OptimalType(isolate(), expected_representation));
|
|
Map::GeneralizeField(target, descriptor, details.constness(),
|
|
expected_representation, value_type);
|
|
}
|
|
DCHECK(target->instance_descriptors()
|
|
->GetFieldType(descriptor)
|
|
->NowContains(value));
|
|
properties.push_back(value);
|
|
map = target;
|
|
descriptor++;
|
|
continue;
|
|
} else {
|
|
transitioning = false;
|
|
}
|
|
}
|
|
|
|
DCHECK(!transitioning);
|
|
|
|
// Commit the intermediate state to the object and stop transitioning.
|
|
CommitStateToJsonObject(json_object, map, properties.GetVector());
|
|
|
|
JSObject::DefinePropertyOrElementIgnoreAttributes(json_object, key, value)
|
|
.Check();
|
|
} while (transitioning && MatchSkipWhiteSpace(','));
|
|
|
|
// If we transitioned until the very end, transition the map now.
|
|
if (transitioning) {
|
|
CommitStateToJsonObject(json_object, map, properties.GetVector());
|
|
} else {
|
|
while (MatchSkipWhiteSpace(',')) {
|
|
HandleScope local_scope(isolate());
|
|
if (c0_ != '"') return ReportUnexpectedCharacter();
|
|
|
|
int start_position = position_;
|
|
Advance();
|
|
|
|
if (IsDecimalDigit(c0_)) {
|
|
ParseElementResult element_result = ParseElement(json_object);
|
|
if (element_result == kNullHandle) return Handle<Object>::null();
|
|
if (element_result == kElementFound) continue;
|
|
}
|
|
// Not an index, fallback to the slow path.
|
|
|
|
position_ = start_position;
|
|
#ifdef DEBUG
|
|
c0_ = '"';
|
|
#endif
|
|
|
|
Handle<String> key;
|
|
Handle<Object> value;
|
|
|
|
key = ParseJsonString();
|
|
if (key.is_null() || c0_ != ':') return ReportUnexpectedCharacter();
|
|
|
|
AdvanceSkipWhitespace();
|
|
value = ParseJsonValue();
|
|
if (value.is_null()) return ReportUnexpectedCharacter();
|
|
|
|
JSObject::DefinePropertyOrElementIgnoreAttributes(json_object, key,
|
|
value)
|
|
.Check();
|
|
}
|
|
}
|
|
|
|
if (c0_ != '}') {
|
|
return ReportUnexpectedCharacter();
|
|
}
|
|
}
|
|
AdvanceSkipWhitespace();
|
|
return scope.CloseAndEscape(json_object);
|
|
}
|
|
|
|
template <bool seq_one_byte>
|
|
void JsonParser<seq_one_byte>::CommitStateToJsonObject(
|
|
Handle<JSObject> json_object, Handle<Map> map,
|
|
Vector<const Handle<Object>> properties) {
|
|
JSObject::AllocateStorageForMap(json_object, map);
|
|
DCHECK(!json_object->map()->is_dictionary_map());
|
|
|
|
DisallowHeapAllocation no_gc;
|
|
DescriptorArray* descriptors = json_object->map()->instance_descriptors();
|
|
for (int i = 0; i < properties.length(); i++) {
|
|
Handle<Object> value = properties[i];
|
|
// Initializing store.
|
|
json_object->WriteToField(i, descriptors->GetDetails(i), *value);
|
|
}
|
|
}
|
|
|
|
class ElementKindLattice {
|
|
private:
|
|
enum {
|
|
SMI_ELEMENTS,
|
|
NUMBER_ELEMENTS,
|
|
OBJECT_ELEMENTS,
|
|
};
|
|
|
|
public:
|
|
ElementKindLattice() : value_(SMI_ELEMENTS) {}
|
|
|
|
void Update(Handle<Object> o) {
|
|
if (o->IsSmi()) {
|
|
return;
|
|
} else if (o->IsHeapNumber()) {
|
|
if (value_ < NUMBER_ELEMENTS) value_ = NUMBER_ELEMENTS;
|
|
} else {
|
|
DCHECK(!o->IsNumber());
|
|
value_ = OBJECT_ELEMENTS;
|
|
}
|
|
}
|
|
|
|
ElementsKind GetElementsKind() const {
|
|
switch (value_) {
|
|
case SMI_ELEMENTS:
|
|
return PACKED_SMI_ELEMENTS;
|
|
case NUMBER_ELEMENTS:
|
|
return PACKED_DOUBLE_ELEMENTS;
|
|
case OBJECT_ELEMENTS:
|
|
return PACKED_ELEMENTS;
|
|
default:
|
|
UNREACHABLE();
|
|
return PACKED_ELEMENTS;
|
|
}
|
|
}
|
|
|
|
private:
|
|
int value_;
|
|
};
|
|
|
|
// Parse a JSON array. Position must be right at '['.
|
|
template <bool seq_one_byte>
|
|
Handle<Object> JsonParser<seq_one_byte>::ParseJsonArray() {
|
|
HandleScope scope(isolate());
|
|
ZoneVector<Handle<Object>> elements(zone());
|
|
DCHECK_EQ(c0_, '[');
|
|
|
|
ElementKindLattice lattice;
|
|
|
|
AdvanceSkipWhitespace();
|
|
if (c0_ != ']') {
|
|
do {
|
|
Handle<Object> element = ParseJsonValue();
|
|
if (element.is_null()) return ReportUnexpectedCharacter();
|
|
elements.push_back(element);
|
|
lattice.Update(element);
|
|
} while (MatchSkipWhiteSpace(','));
|
|
if (c0_ != ']') {
|
|
return ReportUnexpectedCharacter();
|
|
}
|
|
}
|
|
AdvanceSkipWhitespace();
|
|
|
|
// Allocate a fixed array with all the elements.
|
|
|
|
Handle<Object> json_array;
|
|
const ElementsKind kind = lattice.GetElementsKind();
|
|
int elements_size = static_cast<int>(elements.size());
|
|
|
|
switch (kind) {
|
|
case PACKED_ELEMENTS:
|
|
case PACKED_SMI_ELEMENTS: {
|
|
Handle<FixedArray> elems =
|
|
factory()->NewFixedArray(elements_size, pretenure_);
|
|
for (int i = 0; i < elements_size; i++) elems->set(i, *elements[i]);
|
|
json_array = factory()->NewJSArrayWithElements(elems, kind, pretenure_);
|
|
break;
|
|
}
|
|
case PACKED_DOUBLE_ELEMENTS: {
|
|
Handle<FixedDoubleArray> elems = Handle<FixedDoubleArray>::cast(
|
|
factory()->NewFixedDoubleArray(elements_size, pretenure_));
|
|
for (int i = 0; i < elements_size; i++) {
|
|
elems->set(i, elements[i]->Number());
|
|
}
|
|
json_array = factory()->NewJSArrayWithElements(elems, kind, pretenure_);
|
|
break;
|
|
}
|
|
default:
|
|
UNREACHABLE();
|
|
}
|
|
|
|
return scope.CloseAndEscape(json_array);
|
|
}
|
|
|
|
template <bool seq_one_byte>
|
|
Handle<Object> JsonParser<seq_one_byte>::ParseJsonNumber() {
|
|
bool negative = false;
|
|
int beg_pos = position_;
|
|
if (c0_ == '-') {
|
|
Advance();
|
|
negative = true;
|
|
}
|
|
if (c0_ == '0') {
|
|
Advance();
|
|
// Prefix zero is only allowed if it's the only digit before
|
|
// a decimal point or exponent.
|
|
if (IsDecimalDigit(c0_)) return ReportUnexpectedCharacter();
|
|
} else {
|
|
int i = 0;
|
|
int digits = 0;
|
|
if (c0_ < '1' || c0_ > '9') return ReportUnexpectedCharacter();
|
|
do {
|
|
i = i * 10 + c0_ - '0';
|
|
digits++;
|
|
Advance();
|
|
} while (IsDecimalDigit(c0_));
|
|
if (c0_ != '.' && c0_ != 'e' && c0_ != 'E' && digits < 10) {
|
|
SkipWhitespace();
|
|
return Handle<Smi>(Smi::FromInt((negative ? -i : i)), isolate());
|
|
}
|
|
}
|
|
if (c0_ == '.') {
|
|
Advance();
|
|
if (!IsDecimalDigit(c0_)) return ReportUnexpectedCharacter();
|
|
do {
|
|
Advance();
|
|
} while (IsDecimalDigit(c0_));
|
|
}
|
|
if (AsciiAlphaToLower(c0_) == 'e') {
|
|
Advance();
|
|
if (c0_ == '-' || c0_ == '+') Advance();
|
|
if (!IsDecimalDigit(c0_)) return ReportUnexpectedCharacter();
|
|
do {
|
|
Advance();
|
|
} while (IsDecimalDigit(c0_));
|
|
}
|
|
int length = position_ - beg_pos;
|
|
double number;
|
|
if (seq_one_byte) {
|
|
Vector<const uint8_t> chars(seq_source_->GetChars() + beg_pos, length);
|
|
number = StringToDouble(isolate()->unicode_cache(), chars,
|
|
NO_FLAGS, // Hex, octal or trailing junk.
|
|
std::numeric_limits<double>::quiet_NaN());
|
|
} else {
|
|
Vector<uint8_t> buffer = Vector<uint8_t>::New(length);
|
|
String::WriteToFlat(*source_, buffer.start(), beg_pos, position_);
|
|
Vector<const uint8_t> result =
|
|
Vector<const uint8_t>(buffer.start(), length);
|
|
number = StringToDouble(isolate()->unicode_cache(), result,
|
|
NO_FLAGS, // Hex, octal or trailing junk.
|
|
0.0);
|
|
buffer.Dispose();
|
|
}
|
|
SkipWhitespace();
|
|
return factory()->NewNumber(number, pretenure_);
|
|
}
|
|
|
|
template <typename StringType>
|
|
inline void SeqStringSet(Handle<StringType> seq_str, int i, uc32 c);
|
|
|
|
template <>
|
|
inline void SeqStringSet(Handle<SeqTwoByteString> seq_str, int i, uc32 c) {
|
|
seq_str->SeqTwoByteStringSet(i, c);
|
|
}
|
|
|
|
template <>
|
|
inline void SeqStringSet(Handle<SeqOneByteString> seq_str, int i, uc32 c) {
|
|
seq_str->SeqOneByteStringSet(i, c);
|
|
}
|
|
|
|
template <typename StringType>
|
|
inline Handle<StringType> NewRawString(Factory* factory, int length,
|
|
PretenureFlag pretenure);
|
|
|
|
template <>
|
|
inline Handle<SeqTwoByteString> NewRawString(Factory* factory, int length,
|
|
PretenureFlag pretenure) {
|
|
return factory->NewRawTwoByteString(length, pretenure).ToHandleChecked();
|
|
}
|
|
|
|
template <>
|
|
inline Handle<SeqOneByteString> NewRawString(Factory* factory, int length,
|
|
PretenureFlag pretenure) {
|
|
return factory->NewRawOneByteString(length, pretenure).ToHandleChecked();
|
|
}
|
|
|
|
// Scans the rest of a JSON string starting from position_ and writes
|
|
// prefix[start..end] along with the scanned characters into a
|
|
// sequential string of type StringType.
|
|
template <bool seq_one_byte>
|
|
template <typename StringType, typename SinkChar>
|
|
Handle<String> JsonParser<seq_one_byte>::SlowScanJsonString(
|
|
Handle<String> prefix, int start, int end) {
|
|
int count = end - start;
|
|
int max_length = count + source_length_ - position_;
|
|
int length = Min(max_length, Max(kInitialSpecialStringLength, 2 * count));
|
|
Handle<StringType> seq_string =
|
|
NewRawString<StringType>(factory(), length, pretenure_);
|
|
// Copy prefix into seq_str.
|
|
SinkChar* dest = seq_string->GetChars();
|
|
String::WriteToFlat(*prefix, dest, start, end);
|
|
|
|
while (c0_ != '"') {
|
|
// Check for control character (0x00-0x1F) or unterminated string (<0).
|
|
if (c0_ < 0x20) return Handle<String>::null();
|
|
if (count >= length) {
|
|
// We need to create a longer sequential string for the result.
|
|
return SlowScanJsonString<StringType, SinkChar>(seq_string, 0, count);
|
|
}
|
|
if (c0_ != '\\') {
|
|
// If the sink can contain UC16 characters, or source_ contains only
|
|
// Latin1 characters, there's no need to test whether we can store the
|
|
// character. Otherwise check whether the UC16 source character can fit
|
|
// in the Latin1 sink.
|
|
if (sizeof(SinkChar) == kUC16Size || seq_one_byte ||
|
|
c0_ <= String::kMaxOneByteCharCode) {
|
|
SeqStringSet(seq_string, count++, c0_);
|
|
Advance();
|
|
} else {
|
|
// StringType is SeqOneByteString and we just read a non-Latin1 char.
|
|
return SlowScanJsonString<SeqTwoByteString, uc16>(seq_string, 0, count);
|
|
}
|
|
} else {
|
|
Advance(); // Advance past the \.
|
|
switch (c0_) {
|
|
case '"':
|
|
case '\\':
|
|
case '/':
|
|
SeqStringSet(seq_string, count++, c0_);
|
|
break;
|
|
case 'b':
|
|
SeqStringSet(seq_string, count++, '\x08');
|
|
break;
|
|
case 'f':
|
|
SeqStringSet(seq_string, count++, '\x0C');
|
|
break;
|
|
case 'n':
|
|
SeqStringSet(seq_string, count++, '\x0A');
|
|
break;
|
|
case 'r':
|
|
SeqStringSet(seq_string, count++, '\x0D');
|
|
break;
|
|
case 't':
|
|
SeqStringSet(seq_string, count++, '\x09');
|
|
break;
|
|
case 'u': {
|
|
uc32 value = 0;
|
|
for (int i = 0; i < 4; i++) {
|
|
Advance();
|
|
int digit = HexValue(c0_);
|
|
if (digit < 0) {
|
|
return Handle<String>::null();
|
|
}
|
|
value = value * 16 + digit;
|
|
}
|
|
if (sizeof(SinkChar) == kUC16Size ||
|
|
value <= String::kMaxOneByteCharCode) {
|
|
SeqStringSet(seq_string, count++, value);
|
|
break;
|
|
} else {
|
|
// StringType is SeqOneByteString and we just read a non-Latin1
|
|
// char.
|
|
position_ -= 6; // Rewind position_ to \ in \uxxxx.
|
|
Advance();
|
|
return SlowScanJsonString<SeqTwoByteString, uc16>(seq_string, 0,
|
|
count);
|
|
}
|
|
}
|
|
default:
|
|
return Handle<String>::null();
|
|
}
|
|
Advance();
|
|
}
|
|
}
|
|
|
|
DCHECK_EQ('"', c0_);
|
|
// Advance past the last '"'.
|
|
AdvanceSkipWhitespace();
|
|
|
|
// Shrink seq_string length to count and return.
|
|
return SeqString::Truncate(seq_string, count);
|
|
}
|
|
|
|
template <bool seq_one_byte>
|
|
Handle<String> JsonParser<seq_one_byte>::ScanJsonString() {
|
|
DCHECK_EQ('"', c0_);
|
|
Advance();
|
|
if (c0_ == '"') {
|
|
AdvanceSkipWhitespace();
|
|
return factory()->empty_string();
|
|
}
|
|
|
|
if (seq_one_byte) {
|
|
// Fast path for existing internalized strings. If the the string being
|
|
// parsed is not a known internalized string, contains backslashes or
|
|
// unexpectedly reaches the end of string, return with an empty handle.
|
|
|
|
// We intentionally use local variables instead of fields, compute hash
|
|
// while we are iterating a string and manually inline StringTable lookup
|
|
// here.
|
|
|
|
int position = position_;
|
|
uc32 c0 = c0_;
|
|
uint32_t running_hash = isolate()->heap()->HashSeed();
|
|
uint32_t index = 0;
|
|
bool is_array_index = true;
|
|
|
|
do {
|
|
if (c0 == '\\') {
|
|
c0_ = c0;
|
|
int beg_pos = position_;
|
|
position_ = position;
|
|
return SlowScanJsonString<SeqOneByteString, uint8_t>(source_, beg_pos,
|
|
position_);
|
|
}
|
|
if (c0 < 0x20) {
|
|
c0_ = c0;
|
|
position_ = position;
|
|
return Handle<String>::null();
|
|
}
|
|
if (is_array_index) {
|
|
// With leading zero, the string has to be "0" to be a valid index.
|
|
if (!IsDecimalDigit(c0) || (position > position_ && index == 0)) {
|
|
is_array_index = false;
|
|
} else {
|
|
int d = c0 - '0';
|
|
is_array_index = index <= 429496729U - ((d + 3) >> 3);
|
|
index = (index * 10) + d;
|
|
}
|
|
}
|
|
running_hash = StringHasher::AddCharacterCore(running_hash,
|
|
static_cast<uint16_t>(c0));
|
|
position++;
|
|
if (position >= source_length_) {
|
|
c0_ = kEndOfString;
|
|
position_ = position;
|
|
return Handle<String>::null();
|
|
}
|
|
c0 = seq_source_->SeqOneByteStringGet(position);
|
|
} while (c0 != '"');
|
|
int length = position - position_;
|
|
uint32_t hash;
|
|
if (is_array_index) {
|
|
hash =
|
|
StringHasher::MakeArrayIndexHash(index, length) >> String::kHashShift;
|
|
} else if (length <= String::kMaxHashCalcLength) {
|
|
hash = StringHasher::GetHashCore(running_hash);
|
|
} else {
|
|
hash = static_cast<uint32_t>(length);
|
|
}
|
|
Vector<const uint8_t> string_vector(seq_source_->GetChars() + position_,
|
|
length);
|
|
StringTable* string_table = isolate()->heap()->string_table();
|
|
uint32_t capacity = string_table->Capacity();
|
|
uint32_t entry = StringTable::FirstProbe(hash, capacity);
|
|
uint32_t count = 1;
|
|
Handle<String> result;
|
|
while (true) {
|
|
Object* element = string_table->KeyAt(entry);
|
|
if (element->IsUndefined(isolate())) {
|
|
// Lookup failure.
|
|
result =
|
|
factory()->InternalizeOneByteString(seq_source_, position_, length);
|
|
break;
|
|
}
|
|
if (!element->IsTheHole(isolate()) &&
|
|
String::cast(element)->IsOneByteEqualTo(string_vector)) {
|
|
result = Handle<String>(String::cast(element), isolate());
|
|
DCHECK_EQ(result->Hash(),
|
|
(hash << String::kHashShift) >> String::kHashShift);
|
|
break;
|
|
}
|
|
entry = StringTable::NextProbe(entry, count++, capacity);
|
|
}
|
|
position_ = position;
|
|
// Advance past the last '"'.
|
|
AdvanceSkipWhitespace();
|
|
return result;
|
|
}
|
|
|
|
int beg_pos = position_;
|
|
// Fast case for Latin1 only without escape characters.
|
|
do {
|
|
// Check for control character (0x00-0x1F) or unterminated string (<0).
|
|
if (c0_ < 0x20) return Handle<String>::null();
|
|
if (c0_ != '\\') {
|
|
if (seq_one_byte || c0_ <= String::kMaxOneByteCharCode) {
|
|
Advance();
|
|
} else {
|
|
return SlowScanJsonString<SeqTwoByteString, uc16>(source_, beg_pos,
|
|
position_);
|
|
}
|
|
} else {
|
|
return SlowScanJsonString<SeqOneByteString, uint8_t>(source_, beg_pos,
|
|
position_);
|
|
}
|
|
} while (c0_ != '"');
|
|
int length = position_ - beg_pos;
|
|
Handle<String> result =
|
|
factory()->NewRawOneByteString(length, pretenure_).ToHandleChecked();
|
|
uint8_t* dest = SeqOneByteString::cast(*result)->GetChars();
|
|
String::WriteToFlat(*source_, dest, beg_pos, position_);
|
|
|
|
DCHECK_EQ('"', c0_);
|
|
// Advance past the last '"'.
|
|
AdvanceSkipWhitespace();
|
|
return result;
|
|
}
|
|
|
|
// Explicit instantiation.
|
|
template class JsonParser<true>;
|
|
template class JsonParser<false>;
|
|
|
|
} // namespace internal
|
|
} // namespace v8
|