4e670fd05e
R=dcarney@chromium.org, marja@chromium.org Review URL: https://codereview.chromium.org/559913002 git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23840 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
880 lines
29 KiB
C++
880 lines
29 KiB
C++
// Copyright 2012 the V8 project authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file.
|
|
|
|
#ifndef V8_JSON_STRINGIFIER_H_
|
|
#define V8_JSON_STRINGIFIER_H_
|
|
|
|
#include "src/v8.h"
|
|
|
|
#include "src/conversions.h"
|
|
#include "src/utils.h"
|
|
|
|
namespace v8 {
|
|
namespace internal {
|
|
|
|
class BasicJsonStringifier BASE_EMBEDDED {
|
|
public:
|
|
explicit BasicJsonStringifier(Isolate* isolate);
|
|
|
|
MUST_USE_RESULT MaybeHandle<Object> Stringify(Handle<Object> object);
|
|
|
|
MUST_USE_RESULT INLINE(static MaybeHandle<Object> StringifyString(
|
|
Isolate* isolate,
|
|
Handle<String> object));
|
|
|
|
private:
|
|
static const int kInitialPartLength = 32;
|
|
static const int kMaxPartLength = 16 * 1024;
|
|
static const int kPartLengthGrowthFactor = 2;
|
|
|
|
enum Result { UNCHANGED, SUCCESS, EXCEPTION };
|
|
|
|
void Accumulate();
|
|
|
|
void Extend();
|
|
|
|
void ChangeEncoding();
|
|
|
|
INLINE(void ShrinkCurrentPart());
|
|
|
|
template <bool is_one_byte, typename Char>
|
|
INLINE(void Append_(Char c));
|
|
|
|
template <bool is_one_byte, typename Char>
|
|
INLINE(void Append_(const Char* chars));
|
|
|
|
INLINE(void Append(uint8_t c)) {
|
|
if (is_one_byte_) {
|
|
Append_<true>(c);
|
|
} else {
|
|
Append_<false>(c);
|
|
}
|
|
}
|
|
|
|
INLINE(void AppendOneByte(const char* chars)) {
|
|
if (is_one_byte_) {
|
|
Append_<true>(reinterpret_cast<const uint8_t*>(chars));
|
|
} else {
|
|
Append_<false>(reinterpret_cast<const uint8_t*>(chars));
|
|
}
|
|
}
|
|
|
|
MUST_USE_RESULT MaybeHandle<Object> ApplyToJsonFunction(
|
|
Handle<Object> object,
|
|
Handle<Object> key);
|
|
|
|
Result SerializeGeneric(Handle<Object> object,
|
|
Handle<Object> key,
|
|
bool deferred_comma,
|
|
bool deferred_key);
|
|
|
|
template <typename ResultType, typename Char>
|
|
INLINE(static Handle<String> StringifyString_(Isolate* isolate,
|
|
Vector<Char> vector,
|
|
Handle<String> result));
|
|
|
|
// Entry point to serialize the object.
|
|
INLINE(Result SerializeObject(Handle<Object> obj)) {
|
|
return Serialize_<false>(obj, false, factory_->empty_string());
|
|
}
|
|
|
|
// Serialize an array element.
|
|
// The index may serve as argument for the toJSON function.
|
|
INLINE(Result SerializeElement(Isolate* isolate,
|
|
Handle<Object> object,
|
|
int i)) {
|
|
return Serialize_<false>(object,
|
|
false,
|
|
Handle<Object>(Smi::FromInt(i), isolate));
|
|
}
|
|
|
|
// Serialize a object property.
|
|
// The key may or may not be serialized depending on the property.
|
|
// The key may also serve as argument for the toJSON function.
|
|
INLINE(Result SerializeProperty(Handle<Object> object,
|
|
bool deferred_comma,
|
|
Handle<String> deferred_key)) {
|
|
DCHECK(!deferred_key.is_null());
|
|
return Serialize_<true>(object, deferred_comma, deferred_key);
|
|
}
|
|
|
|
template <bool deferred_string_key>
|
|
Result Serialize_(Handle<Object> object, bool comma, Handle<Object> key);
|
|
|
|
void SerializeDeferredKey(bool deferred_comma, Handle<Object> deferred_key) {
|
|
if (deferred_comma) Append(',');
|
|
SerializeString(Handle<String>::cast(deferred_key));
|
|
Append(':');
|
|
}
|
|
|
|
Result SerializeSmi(Smi* object);
|
|
|
|
Result SerializeDouble(double number);
|
|
INLINE(Result SerializeHeapNumber(Handle<HeapNumber> object)) {
|
|
return SerializeDouble(object->value());
|
|
}
|
|
|
|
Result SerializeJSValue(Handle<JSValue> object);
|
|
|
|
INLINE(Result SerializeJSArray(Handle<JSArray> object));
|
|
INLINE(Result SerializeJSObject(Handle<JSObject> object));
|
|
|
|
Result SerializeJSArraySlow(Handle<JSArray> object, uint32_t length);
|
|
|
|
void SerializeString(Handle<String> object);
|
|
|
|
template <typename SrcChar, typename DestChar>
|
|
INLINE(static int SerializeStringUnchecked_(const SrcChar* src,
|
|
DestChar* dest,
|
|
int length));
|
|
|
|
template <bool is_one_byte, typename Char>
|
|
INLINE(void SerializeString_(Handle<String> string));
|
|
|
|
template <typename Char>
|
|
INLINE(static bool DoNotEscape(Char c));
|
|
|
|
template <typename Char>
|
|
INLINE(static Vector<const Char> GetCharVector(Handle<String> string));
|
|
|
|
Result StackPush(Handle<Object> object);
|
|
void StackPop();
|
|
|
|
INLINE(Handle<String> accumulator()) {
|
|
return Handle<String>(String::cast(accumulator_store_->value()), isolate_);
|
|
}
|
|
|
|
INLINE(void set_accumulator(Handle<String> string)) {
|
|
return accumulator_store_->set_value(*string);
|
|
}
|
|
|
|
Isolate* isolate_;
|
|
Factory* factory_;
|
|
// We use a value wrapper for the string accumulator to keep the
|
|
// (indirect) handle to it in the outermost handle scope.
|
|
Handle<JSValue> accumulator_store_;
|
|
Handle<String> current_part_;
|
|
Handle<String> tojson_string_;
|
|
Handle<JSArray> stack_;
|
|
int current_index_;
|
|
int part_length_;
|
|
bool is_one_byte_;
|
|
bool overflowed_;
|
|
|
|
static const int kJsonEscapeTableEntrySize = 8;
|
|
static const char* const JsonEscapeTable;
|
|
};
|
|
|
|
|
|
// Translation table to escape Latin1 characters.
|
|
// Table entries start at a multiple of 8 and are null-terminated.
|
|
const char* const BasicJsonStringifier::JsonEscapeTable =
|
|
"\\u0000\0 \\u0001\0 \\u0002\0 \\u0003\0 "
|
|
"\\u0004\0 \\u0005\0 \\u0006\0 \\u0007\0 "
|
|
"\\b\0 \\t\0 \\n\0 \\u000b\0 "
|
|
"\\f\0 \\r\0 \\u000e\0 \\u000f\0 "
|
|
"\\u0010\0 \\u0011\0 \\u0012\0 \\u0013\0 "
|
|
"\\u0014\0 \\u0015\0 \\u0016\0 \\u0017\0 "
|
|
"\\u0018\0 \\u0019\0 \\u001a\0 \\u001b\0 "
|
|
"\\u001c\0 \\u001d\0 \\u001e\0 \\u001f\0 "
|
|
" \0 !\0 \\\"\0 #\0 "
|
|
"$\0 %\0 &\0 '\0 "
|
|
"(\0 )\0 *\0 +\0 "
|
|
",\0 -\0 .\0 /\0 "
|
|
"0\0 1\0 2\0 3\0 "
|
|
"4\0 5\0 6\0 7\0 "
|
|
"8\0 9\0 :\0 ;\0 "
|
|
"<\0 =\0 >\0 ?\0 "
|
|
"@\0 A\0 B\0 C\0 "
|
|
"D\0 E\0 F\0 G\0 "
|
|
"H\0 I\0 J\0 K\0 "
|
|
"L\0 M\0 N\0 O\0 "
|
|
"P\0 Q\0 R\0 S\0 "
|
|
"T\0 U\0 V\0 W\0 "
|
|
"X\0 Y\0 Z\0 [\0 "
|
|
"\\\\\0 ]\0 ^\0 _\0 "
|
|
"`\0 a\0 b\0 c\0 "
|
|
"d\0 e\0 f\0 g\0 "
|
|
"h\0 i\0 j\0 k\0 "
|
|
"l\0 m\0 n\0 o\0 "
|
|
"p\0 q\0 r\0 s\0 "
|
|
"t\0 u\0 v\0 w\0 "
|
|
"x\0 y\0 z\0 {\0 "
|
|
"|\0 }\0 ~\0 \177\0 "
|
|
"\200\0 \201\0 \202\0 \203\0 "
|
|
"\204\0 \205\0 \206\0 \207\0 "
|
|
"\210\0 \211\0 \212\0 \213\0 "
|
|
"\214\0 \215\0 \216\0 \217\0 "
|
|
"\220\0 \221\0 \222\0 \223\0 "
|
|
"\224\0 \225\0 \226\0 \227\0 "
|
|
"\230\0 \231\0 \232\0 \233\0 "
|
|
"\234\0 \235\0 \236\0 \237\0 "
|
|
"\240\0 \241\0 \242\0 \243\0 "
|
|
"\244\0 \245\0 \246\0 \247\0 "
|
|
"\250\0 \251\0 \252\0 \253\0 "
|
|
"\254\0 \255\0 \256\0 \257\0 "
|
|
"\260\0 \261\0 \262\0 \263\0 "
|
|
"\264\0 \265\0 \266\0 \267\0 "
|
|
"\270\0 \271\0 \272\0 \273\0 "
|
|
"\274\0 \275\0 \276\0 \277\0 "
|
|
"\300\0 \301\0 \302\0 \303\0 "
|
|
"\304\0 \305\0 \306\0 \307\0 "
|
|
"\310\0 \311\0 \312\0 \313\0 "
|
|
"\314\0 \315\0 \316\0 \317\0 "
|
|
"\320\0 \321\0 \322\0 \323\0 "
|
|
"\324\0 \325\0 \326\0 \327\0 "
|
|
"\330\0 \331\0 \332\0 \333\0 "
|
|
"\334\0 \335\0 \336\0 \337\0 "
|
|
"\340\0 \341\0 \342\0 \343\0 "
|
|
"\344\0 \345\0 \346\0 \347\0 "
|
|
"\350\0 \351\0 \352\0 \353\0 "
|
|
"\354\0 \355\0 \356\0 \357\0 "
|
|
"\360\0 \361\0 \362\0 \363\0 "
|
|
"\364\0 \365\0 \366\0 \367\0 "
|
|
"\370\0 \371\0 \372\0 \373\0 "
|
|
"\374\0 \375\0 \376\0 \377\0 ";
|
|
|
|
|
|
BasicJsonStringifier::BasicJsonStringifier(Isolate* isolate)
|
|
: isolate_(isolate),
|
|
current_index_(0),
|
|
is_one_byte_(true),
|
|
overflowed_(false) {
|
|
factory_ = isolate_->factory();
|
|
accumulator_store_ = Handle<JSValue>::cast(
|
|
Object::ToObject(isolate, factory_->empty_string()).ToHandleChecked());
|
|
part_length_ = kInitialPartLength;
|
|
current_part_ = factory_->NewRawOneByteString(part_length_).ToHandleChecked();
|
|
tojson_string_ = factory_->toJSON_string();
|
|
stack_ = factory_->NewJSArray(8);
|
|
}
|
|
|
|
|
|
MaybeHandle<Object> BasicJsonStringifier::Stringify(Handle<Object> object) {
|
|
Result result = SerializeObject(object);
|
|
if (result == UNCHANGED) return isolate_->factory()->undefined_value();
|
|
if (result == SUCCESS) {
|
|
ShrinkCurrentPart();
|
|
Accumulate();
|
|
if (overflowed_) {
|
|
THROW_NEW_ERROR(isolate_, NewInvalidStringLengthError(), Object);
|
|
}
|
|
return accumulator();
|
|
}
|
|
DCHECK(result == EXCEPTION);
|
|
return MaybeHandle<Object>();
|
|
}
|
|
|
|
|
|
MaybeHandle<Object> BasicJsonStringifier::StringifyString(
|
|
Isolate* isolate, Handle<String> object) {
|
|
static const int kJsonQuoteWorstCaseBlowup = 6;
|
|
static const int kSpaceForQuotes = 2;
|
|
int worst_case_length =
|
|
object->length() * kJsonQuoteWorstCaseBlowup + kSpaceForQuotes;
|
|
|
|
if (worst_case_length > 32 * KB) { // Slow path if too large.
|
|
BasicJsonStringifier stringifier(isolate);
|
|
return stringifier.Stringify(object);
|
|
}
|
|
|
|
object = String::Flatten(object);
|
|
DCHECK(object->IsFlat());
|
|
if (object->IsOneByteRepresentationUnderneath()) {
|
|
Handle<String> result = isolate->factory()->NewRawOneByteString(
|
|
worst_case_length).ToHandleChecked();
|
|
DisallowHeapAllocation no_gc;
|
|
return StringifyString_<SeqOneByteString>(
|
|
isolate,
|
|
object->GetFlatContent().ToOneByteVector(),
|
|
result);
|
|
} else {
|
|
Handle<String> result = isolate->factory()->NewRawTwoByteString(
|
|
worst_case_length).ToHandleChecked();
|
|
DisallowHeapAllocation no_gc;
|
|
return StringifyString_<SeqTwoByteString>(
|
|
isolate,
|
|
object->GetFlatContent().ToUC16Vector(),
|
|
result);
|
|
}
|
|
}
|
|
|
|
|
|
template <typename ResultType, typename Char>
|
|
Handle<String> BasicJsonStringifier::StringifyString_(Isolate* isolate,
|
|
Vector<Char> vector,
|
|
Handle<String> result) {
|
|
DisallowHeapAllocation no_gc;
|
|
int final_size = 0;
|
|
ResultType* dest = ResultType::cast(*result);
|
|
dest->Set(final_size++, '\"');
|
|
final_size += SerializeStringUnchecked_(vector.start(),
|
|
dest->GetChars() + 1,
|
|
vector.length());
|
|
dest->Set(final_size++, '\"');
|
|
return SeqString::Truncate(Handle<SeqString>::cast(result), final_size);
|
|
}
|
|
|
|
|
|
template <bool is_one_byte, typename Char>
|
|
void BasicJsonStringifier::Append_(Char c) {
|
|
if (is_one_byte) {
|
|
SeqOneByteString::cast(*current_part_)->SeqOneByteStringSet(
|
|
current_index_++, c);
|
|
} else {
|
|
SeqTwoByteString::cast(*current_part_)->SeqTwoByteStringSet(
|
|
current_index_++, c);
|
|
}
|
|
if (current_index_ == part_length_) Extend();
|
|
}
|
|
|
|
|
|
template <bool is_one_byte, typename Char>
|
|
void BasicJsonStringifier::Append_(const Char* chars) {
|
|
for (; *chars != '\0'; chars++) Append_<is_one_byte, Char>(*chars);
|
|
}
|
|
|
|
|
|
MaybeHandle<Object> BasicJsonStringifier::ApplyToJsonFunction(
|
|
Handle<Object> object, Handle<Object> key) {
|
|
LookupIterator it(object, tojson_string_,
|
|
LookupIterator::PROTOTYPE_CHAIN_SKIP_INTERCEPTOR);
|
|
Handle<Object> fun;
|
|
ASSIGN_RETURN_ON_EXCEPTION(isolate_, fun, Object::GetProperty(&it), Object);
|
|
if (!fun->IsJSFunction()) return object;
|
|
|
|
// Call toJSON function.
|
|
if (key->IsSmi()) key = factory_->NumberToString(key);
|
|
Handle<Object> argv[] = { key };
|
|
HandleScope scope(isolate_);
|
|
ASSIGN_RETURN_ON_EXCEPTION(
|
|
isolate_, object,
|
|
Execution::Call(isolate_, fun, object, 1, argv),
|
|
Object);
|
|
return scope.CloseAndEscape(object);
|
|
}
|
|
|
|
|
|
BasicJsonStringifier::Result BasicJsonStringifier::StackPush(
|
|
Handle<Object> object) {
|
|
StackLimitCheck check(isolate_);
|
|
if (check.HasOverflowed()) {
|
|
isolate_->StackOverflow();
|
|
return EXCEPTION;
|
|
}
|
|
|
|
int length = Smi::cast(stack_->length())->value();
|
|
{
|
|
DisallowHeapAllocation no_allocation;
|
|
FixedArray* elements = FixedArray::cast(stack_->elements());
|
|
for (int i = 0; i < length; i++) {
|
|
if (elements->get(i) == *object) {
|
|
AllowHeapAllocation allow_to_return_error;
|
|
Handle<Object> error;
|
|
MaybeHandle<Object> maybe_error = factory_->NewTypeError(
|
|
"circular_structure", HandleVector<Object>(NULL, 0));
|
|
if (maybe_error.ToHandle(&error)) isolate_->Throw(*error);
|
|
return EXCEPTION;
|
|
}
|
|
}
|
|
}
|
|
JSArray::EnsureSize(stack_, length + 1);
|
|
FixedArray::cast(stack_->elements())->set(length, *object);
|
|
stack_->set_length(Smi::FromInt(length + 1));
|
|
return SUCCESS;
|
|
}
|
|
|
|
|
|
void BasicJsonStringifier::StackPop() {
|
|
int length = Smi::cast(stack_->length())->value();
|
|
stack_->set_length(Smi::FromInt(length - 1));
|
|
}
|
|
|
|
|
|
template <bool deferred_string_key>
|
|
BasicJsonStringifier::Result BasicJsonStringifier::Serialize_(
|
|
Handle<Object> object, bool comma, Handle<Object> key) {
|
|
if (object->IsJSObject()) {
|
|
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
|
|
isolate_, object,
|
|
ApplyToJsonFunction(object, key),
|
|
EXCEPTION);
|
|
}
|
|
|
|
if (object->IsSmi()) {
|
|
if (deferred_string_key) SerializeDeferredKey(comma, key);
|
|
return SerializeSmi(Smi::cast(*object));
|
|
}
|
|
|
|
switch (HeapObject::cast(*object)->map()->instance_type()) {
|
|
case HEAP_NUMBER_TYPE:
|
|
case MUTABLE_HEAP_NUMBER_TYPE:
|
|
if (deferred_string_key) SerializeDeferredKey(comma, key);
|
|
return SerializeHeapNumber(Handle<HeapNumber>::cast(object));
|
|
case ODDBALL_TYPE:
|
|
switch (Oddball::cast(*object)->kind()) {
|
|
case Oddball::kFalse:
|
|
if (deferred_string_key) SerializeDeferredKey(comma, key);
|
|
AppendOneByte("false");
|
|
return SUCCESS;
|
|
case Oddball::kTrue:
|
|
if (deferred_string_key) SerializeDeferredKey(comma, key);
|
|
AppendOneByte("true");
|
|
return SUCCESS;
|
|
case Oddball::kNull:
|
|
if (deferred_string_key) SerializeDeferredKey(comma, key);
|
|
AppendOneByte("null");
|
|
return SUCCESS;
|
|
default:
|
|
return UNCHANGED;
|
|
}
|
|
case JS_ARRAY_TYPE:
|
|
if (object->IsAccessCheckNeeded()) break;
|
|
if (deferred_string_key) SerializeDeferredKey(comma, key);
|
|
return SerializeJSArray(Handle<JSArray>::cast(object));
|
|
case JS_VALUE_TYPE:
|
|
if (deferred_string_key) SerializeDeferredKey(comma, key);
|
|
return SerializeJSValue(Handle<JSValue>::cast(object));
|
|
case JS_FUNCTION_TYPE:
|
|
return UNCHANGED;
|
|
default:
|
|
if (object->IsString()) {
|
|
if (deferred_string_key) SerializeDeferredKey(comma, key);
|
|
SerializeString(Handle<String>::cast(object));
|
|
return SUCCESS;
|
|
} else if (object->IsJSObject()) {
|
|
// Go to slow path for global proxy and objects requiring access checks.
|
|
if (object->IsAccessCheckNeeded() || object->IsJSGlobalProxy()) break;
|
|
if (deferred_string_key) SerializeDeferredKey(comma, key);
|
|
return SerializeJSObject(Handle<JSObject>::cast(object));
|
|
}
|
|
}
|
|
|
|
return SerializeGeneric(object, key, comma, deferred_string_key);
|
|
}
|
|
|
|
|
|
BasicJsonStringifier::Result BasicJsonStringifier::SerializeGeneric(
|
|
Handle<Object> object,
|
|
Handle<Object> key,
|
|
bool deferred_comma,
|
|
bool deferred_key) {
|
|
Handle<JSObject> builtins(isolate_->native_context()->builtins(), isolate_);
|
|
Handle<JSFunction> builtin = Handle<JSFunction>::cast(Object::GetProperty(
|
|
isolate_, builtins, "JSONSerializeAdapter").ToHandleChecked());
|
|
|
|
Handle<Object> argv[] = { key, object };
|
|
Handle<Object> result;
|
|
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
|
|
isolate_, result,
|
|
Execution::Call(isolate_, builtin, object, 2, argv),
|
|
EXCEPTION);
|
|
if (result->IsUndefined()) return UNCHANGED;
|
|
if (deferred_key) {
|
|
if (key->IsSmi()) key = factory_->NumberToString(key);
|
|
SerializeDeferredKey(deferred_comma, key);
|
|
}
|
|
|
|
Handle<String> result_string = Handle<String>::cast(result);
|
|
// Shrink current part, attach it to the accumulator, also attach the result
|
|
// string to the accumulator, and allocate a new part.
|
|
ShrinkCurrentPart(); // Shrink.
|
|
part_length_ = kInitialPartLength; // Allocate conservatively.
|
|
Extend(); // Attach current part and allocate new part.
|
|
// Attach result string to the accumulator.
|
|
Handle<String> cons;
|
|
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
|
|
isolate_, cons,
|
|
factory_->NewConsString(accumulator(), result_string),
|
|
EXCEPTION);
|
|
set_accumulator(cons);
|
|
return SUCCESS;
|
|
}
|
|
|
|
|
|
BasicJsonStringifier::Result BasicJsonStringifier::SerializeJSValue(
|
|
Handle<JSValue> object) {
|
|
String* class_name = object->class_name();
|
|
if (class_name == isolate_->heap()->String_string()) {
|
|
Handle<Object> value;
|
|
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
|
|
isolate_, value, Execution::ToString(isolate_, object), EXCEPTION);
|
|
SerializeString(Handle<String>::cast(value));
|
|
} else if (class_name == isolate_->heap()->Number_string()) {
|
|
Handle<Object> value;
|
|
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
|
|
isolate_, value, Execution::ToNumber(isolate_, object), EXCEPTION);
|
|
if (value->IsSmi()) return SerializeSmi(Smi::cast(*value));
|
|
SerializeHeapNumber(Handle<HeapNumber>::cast(value));
|
|
} else {
|
|
DCHECK(class_name == isolate_->heap()->Boolean_string());
|
|
Object* value = JSValue::cast(*object)->value();
|
|
DCHECK(value->IsBoolean());
|
|
AppendOneByte(value->IsTrue() ? "true" : "false");
|
|
}
|
|
return SUCCESS;
|
|
}
|
|
|
|
|
|
BasicJsonStringifier::Result BasicJsonStringifier::SerializeSmi(Smi* object) {
|
|
static const int kBufferSize = 100;
|
|
char chars[kBufferSize];
|
|
Vector<char> buffer(chars, kBufferSize);
|
|
AppendOneByte(IntToCString(object->value(), buffer));
|
|
return SUCCESS;
|
|
}
|
|
|
|
|
|
BasicJsonStringifier::Result BasicJsonStringifier::SerializeDouble(
|
|
double number) {
|
|
if (std::isinf(number) || std::isnan(number)) {
|
|
AppendOneByte("null");
|
|
return SUCCESS;
|
|
}
|
|
static const int kBufferSize = 100;
|
|
char chars[kBufferSize];
|
|
Vector<char> buffer(chars, kBufferSize);
|
|
AppendOneByte(DoubleToCString(number, buffer));
|
|
return SUCCESS;
|
|
}
|
|
|
|
|
|
BasicJsonStringifier::Result BasicJsonStringifier::SerializeJSArray(
|
|
Handle<JSArray> object) {
|
|
HandleScope handle_scope(isolate_);
|
|
Result stack_push = StackPush(object);
|
|
if (stack_push != SUCCESS) return stack_push;
|
|
uint32_t length = 0;
|
|
CHECK(object->length()->ToArrayIndex(&length));
|
|
Append('[');
|
|
switch (object->GetElementsKind()) {
|
|
case FAST_SMI_ELEMENTS: {
|
|
Handle<FixedArray> elements(
|
|
FixedArray::cast(object->elements()), isolate_);
|
|
for (uint32_t i = 0; i < length; i++) {
|
|
if (i > 0) Append(',');
|
|
SerializeSmi(Smi::cast(elements->get(i)));
|
|
}
|
|
break;
|
|
}
|
|
case FAST_DOUBLE_ELEMENTS: {
|
|
// Empty array is FixedArray but not FixedDoubleArray.
|
|
if (length == 0) break;
|
|
Handle<FixedDoubleArray> elements(
|
|
FixedDoubleArray::cast(object->elements()), isolate_);
|
|
for (uint32_t i = 0; i < length; i++) {
|
|
if (i > 0) Append(',');
|
|
SerializeDouble(elements->get_scalar(i));
|
|
}
|
|
break;
|
|
}
|
|
case FAST_ELEMENTS: {
|
|
Handle<FixedArray> elements(
|
|
FixedArray::cast(object->elements()), isolate_);
|
|
for (uint32_t i = 0; i < length; i++) {
|
|
if (i > 0) Append(',');
|
|
Result result =
|
|
SerializeElement(isolate_,
|
|
Handle<Object>(elements->get(i), isolate_),
|
|
i);
|
|
if (result == SUCCESS) continue;
|
|
if (result == UNCHANGED) {
|
|
AppendOneByte("null");
|
|
} else {
|
|
return result;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
// TODO(yangguo): The FAST_HOLEY_* cases could be handled in a faster way.
|
|
// They resemble the non-holey cases except that a prototype chain lookup
|
|
// is necessary for holes.
|
|
default: {
|
|
Result result = SerializeJSArraySlow(object, length);
|
|
if (result != SUCCESS) return result;
|
|
break;
|
|
}
|
|
}
|
|
Append(']');
|
|
StackPop();
|
|
current_part_ = handle_scope.CloseAndEscape(current_part_);
|
|
return SUCCESS;
|
|
}
|
|
|
|
|
|
BasicJsonStringifier::Result BasicJsonStringifier::SerializeJSArraySlow(
|
|
Handle<JSArray> object, uint32_t length) {
|
|
for (uint32_t i = 0; i < length; i++) {
|
|
if (i > 0) Append(',');
|
|
Handle<Object> element;
|
|
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
|
|
isolate_, element,
|
|
Object::GetElement(isolate_, object, i),
|
|
EXCEPTION);
|
|
if (element->IsUndefined()) {
|
|
AppendOneByte("null");
|
|
} else {
|
|
Result result = SerializeElement(isolate_, element, i);
|
|
if (result == SUCCESS) continue;
|
|
if (result == UNCHANGED) {
|
|
AppendOneByte("null");
|
|
} else {
|
|
return result;
|
|
}
|
|
}
|
|
}
|
|
return SUCCESS;
|
|
}
|
|
|
|
|
|
BasicJsonStringifier::Result BasicJsonStringifier::SerializeJSObject(
|
|
Handle<JSObject> object) {
|
|
HandleScope handle_scope(isolate_);
|
|
Result stack_push = StackPush(object);
|
|
if (stack_push != SUCCESS) return stack_push;
|
|
DCHECK(!object->IsJSGlobalProxy() && !object->IsGlobalObject());
|
|
|
|
Append('{');
|
|
bool comma = false;
|
|
|
|
if (object->HasFastProperties() &&
|
|
!object->HasIndexedInterceptor() &&
|
|
!object->HasNamedInterceptor() &&
|
|
object->elements()->length() == 0) {
|
|
Handle<Map> map(object->map());
|
|
for (int i = 0; i < map->NumberOfOwnDescriptors(); i++) {
|
|
Handle<Name> name(map->instance_descriptors()->GetKey(i), isolate_);
|
|
// TODO(rossberg): Should this throw?
|
|
if (!name->IsString()) continue;
|
|
Handle<String> key = Handle<String>::cast(name);
|
|
PropertyDetails details = map->instance_descriptors()->GetDetails(i);
|
|
if (details.IsDontEnum()) continue;
|
|
Handle<Object> property;
|
|
if (details.type() == FIELD && *map == object->map()) {
|
|
property = Handle<Object>(object->RawFastPropertyAt(
|
|
FieldIndex::ForDescriptor(*map, i)), isolate_);
|
|
} else {
|
|
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
|
|
isolate_, property,
|
|
Object::GetPropertyOrElement(object, key),
|
|
EXCEPTION);
|
|
}
|
|
Result result = SerializeProperty(property, comma, key);
|
|
if (!comma && result == SUCCESS) comma = true;
|
|
if (result == EXCEPTION) return result;
|
|
}
|
|
} else {
|
|
Handle<FixedArray> contents;
|
|
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
|
|
isolate_, contents,
|
|
JSReceiver::GetKeys(object, JSReceiver::OWN_ONLY),
|
|
EXCEPTION);
|
|
|
|
for (int i = 0; i < contents->length(); i++) {
|
|
Object* key = contents->get(i);
|
|
Handle<String> key_handle;
|
|
MaybeHandle<Object> maybe_property;
|
|
if (key->IsString()) {
|
|
key_handle = Handle<String>(String::cast(key), isolate_);
|
|
maybe_property = Object::GetPropertyOrElement(object, key_handle);
|
|
} else {
|
|
DCHECK(key->IsNumber());
|
|
key_handle = factory_->NumberToString(Handle<Object>(key, isolate_));
|
|
uint32_t index;
|
|
if (key->IsSmi()) {
|
|
maybe_property = Object::GetElement(
|
|
isolate_, object, Smi::cast(key)->value());
|
|
} else if (key_handle->AsArrayIndex(&index)) {
|
|
maybe_property = Object::GetElement(isolate_, object, index);
|
|
} else {
|
|
maybe_property = Object::GetPropertyOrElement(object, key_handle);
|
|
}
|
|
}
|
|
Handle<Object> property;
|
|
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
|
|
isolate_, property, maybe_property, EXCEPTION);
|
|
Result result = SerializeProperty(property, comma, key_handle);
|
|
if (!comma && result == SUCCESS) comma = true;
|
|
if (result == EXCEPTION) return result;
|
|
}
|
|
}
|
|
|
|
Append('}');
|
|
StackPop();
|
|
current_part_ = handle_scope.CloseAndEscape(current_part_);
|
|
return SUCCESS;
|
|
}
|
|
|
|
|
|
void BasicJsonStringifier::ShrinkCurrentPart() {
|
|
DCHECK(current_index_ < part_length_);
|
|
current_part_ = SeqString::Truncate(Handle<SeqString>::cast(current_part_),
|
|
current_index_);
|
|
}
|
|
|
|
|
|
void BasicJsonStringifier::Accumulate() {
|
|
if (accumulator()->length() + current_part_->length() > String::kMaxLength) {
|
|
// Screw it. Simply set the flag and carry on. Throw exception at the end.
|
|
set_accumulator(factory_->empty_string());
|
|
overflowed_ = true;
|
|
} else {
|
|
set_accumulator(factory_->NewConsString(accumulator(),
|
|
current_part_).ToHandleChecked());
|
|
}
|
|
}
|
|
|
|
|
|
void BasicJsonStringifier::Extend() {
|
|
Accumulate();
|
|
if (part_length_ <= kMaxPartLength / kPartLengthGrowthFactor) {
|
|
part_length_ *= kPartLengthGrowthFactor;
|
|
}
|
|
if (is_one_byte_) {
|
|
current_part_ =
|
|
factory_->NewRawOneByteString(part_length_).ToHandleChecked();
|
|
} else {
|
|
current_part_ =
|
|
factory_->NewRawTwoByteString(part_length_).ToHandleChecked();
|
|
}
|
|
DCHECK(!current_part_.is_null());
|
|
current_index_ = 0;
|
|
}
|
|
|
|
|
|
void BasicJsonStringifier::ChangeEncoding() {
|
|
ShrinkCurrentPart();
|
|
Accumulate();
|
|
current_part_ =
|
|
factory_->NewRawTwoByteString(part_length_).ToHandleChecked();
|
|
DCHECK(!current_part_.is_null());
|
|
current_index_ = 0;
|
|
is_one_byte_ = false;
|
|
}
|
|
|
|
|
|
template <typename SrcChar, typename DestChar>
|
|
int BasicJsonStringifier::SerializeStringUnchecked_(const SrcChar* src,
|
|
DestChar* dest,
|
|
int length) {
|
|
DestChar* dest_start = dest;
|
|
|
|
// Assert that uc16 character is not truncated down to 8 bit.
|
|
// The <uc16, char> version of this method must not be called.
|
|
DCHECK(sizeof(*dest) >= sizeof(*src));
|
|
|
|
for (int i = 0; i < length; i++) {
|
|
SrcChar c = src[i];
|
|
if (DoNotEscape(c)) {
|
|
*(dest++) = static_cast<DestChar>(c);
|
|
} else {
|
|
const uint8_t* chars = reinterpret_cast<const uint8_t*>(
|
|
&JsonEscapeTable[c * kJsonEscapeTableEntrySize]);
|
|
while (*chars != '\0') *(dest++) = *(chars++);
|
|
}
|
|
}
|
|
|
|
return static_cast<int>(dest - dest_start);
|
|
}
|
|
|
|
|
|
template <bool is_one_byte, typename Char>
|
|
void BasicJsonStringifier::SerializeString_(Handle<String> string) {
|
|
int length = string->length();
|
|
Append_<is_one_byte, char>('"');
|
|
// We make a rough estimate to find out if the current string can be
|
|
// serialized without allocating a new string part. The worst case length of
|
|
// an escaped character is 6. Shifting the remainin string length right by 3
|
|
// is a more pessimistic estimate, but faster to calculate.
|
|
|
|
if (((part_length_ - current_index_) >> 3) > length) {
|
|
DisallowHeapAllocation no_gc;
|
|
Vector<const Char> vector = GetCharVector<Char>(string);
|
|
if (is_one_byte) {
|
|
current_index_ += SerializeStringUnchecked_(
|
|
vector.start(),
|
|
SeqOneByteString::cast(*current_part_)->GetChars() + current_index_,
|
|
length);
|
|
} else {
|
|
current_index_ += SerializeStringUnchecked_(
|
|
vector.start(),
|
|
SeqTwoByteString::cast(*current_part_)->GetChars() + current_index_,
|
|
length);
|
|
}
|
|
} else {
|
|
String* string_location = NULL;
|
|
Vector<const Char> vector(NULL, 0);
|
|
for (int i = 0; i < length; i++) {
|
|
// If GC moved the string, we need to refresh the vector.
|
|
if (*string != string_location) {
|
|
DisallowHeapAllocation no_gc;
|
|
// This does not actually prevent the string from being relocated later.
|
|
vector = GetCharVector<Char>(string);
|
|
string_location = *string;
|
|
}
|
|
Char c = vector[i];
|
|
if (DoNotEscape(c)) {
|
|
Append_<is_one_byte, Char>(c);
|
|
} else {
|
|
Append_<is_one_byte, uint8_t>(reinterpret_cast<const uint8_t*>(
|
|
&JsonEscapeTable[c * kJsonEscapeTableEntrySize]));
|
|
}
|
|
}
|
|
}
|
|
|
|
Append_<is_one_byte, uint8_t>('"');
|
|
}
|
|
|
|
|
|
template <>
|
|
bool BasicJsonStringifier::DoNotEscape(uint8_t c) {
|
|
return c >= '#' && c <= '~' && c != '\\';
|
|
}
|
|
|
|
|
|
template <>
|
|
bool BasicJsonStringifier::DoNotEscape(uint16_t c) {
|
|
return c >= '#' && c != '\\' && c != 0x7f;
|
|
}
|
|
|
|
|
|
template <>
|
|
Vector<const uint8_t> BasicJsonStringifier::GetCharVector(
|
|
Handle<String> string) {
|
|
String::FlatContent flat = string->GetFlatContent();
|
|
DCHECK(flat.IsOneByte());
|
|
return flat.ToOneByteVector();
|
|
}
|
|
|
|
|
|
template <>
|
|
Vector<const uc16> BasicJsonStringifier::GetCharVector(Handle<String> string) {
|
|
String::FlatContent flat = string->GetFlatContent();
|
|
DCHECK(flat.IsTwoByte());
|
|
return flat.ToUC16Vector();
|
|
}
|
|
|
|
|
|
void BasicJsonStringifier::SerializeString(Handle<String> object) {
|
|
object = String::Flatten(object);
|
|
if (is_one_byte_) {
|
|
if (object->IsOneByteRepresentationUnderneath()) {
|
|
SerializeString_<true, uint8_t>(object);
|
|
} else {
|
|
ChangeEncoding();
|
|
SerializeString(object);
|
|
}
|
|
} else {
|
|
if (object->IsOneByteRepresentationUnderneath()) {
|
|
SerializeString_<false, uint8_t>(object);
|
|
} else {
|
|
SerializeString_<false, uc16>(object);
|
|
}
|
|
}
|
|
}
|
|
|
|
} } // namespace v8::internal
|
|
|
|
#endif // V8_JSON_STRINGIFIER_H_
|