| OLD | NEW |
|---|
| (Empty) |
| 1 // Copyright 2012 the V8 project authors. All rights reserved. | |
| 2 // Redistribution and use in source and binary forms, with or without | |
| 3 // modification, are permitted provided that the following conditions are | |
| 4 // met: | |
| 5 // | |
| 6 // * Redistributions of source code must retain the above copyright | |
| 7 // notice, this list of conditions and the following disclaimer. | |
| 8 // * Redistributions in binary form must reproduce the above | |
| 9 // copyright notice, this list of conditions and the following | |
| 10 // disclaimer in the documentation and/or other materials provided | |
| 11 // with the distribution. | |
| 12 // * Neither the name of Google Inc. nor the names of its | |
| 13 // contributors may be used to endorse or promote products derived | |
| 14 // from this software without specific prior written permission. | |
| 15 // | |
| 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 27 | |
| 28 #ifndef V8_JSON_STRINGIFIER_H_ | |
| 29 #define V8_JSON_STRINGIFIER_H_ | |
| 30 | |
| 31 #include "v8.h" | |
| 32 #include "v8utils.h" | |
| 33 #include "v8conversions.h" | |
| 34 | |
| 35 namespace v8 { | |
| 36 namespace internal { | |
| 37 | |
| 38 class BasicJsonStringifier BASE_EMBEDDED { | |
| 39 public: | |
| 40 explicit BasicJsonStringifier(Isolate* isolate); | |
| 41 | |
| 42 MaybeObject* Stringify(Handle<Object> object); | |
| 43 | |
| 44 private: | |
| 45 static const int kInitialPartLength = 32; | |
| 46 static const int kMaxPartLength = 16 * 1024; | |
| 47 static const int kPartLengthGrowthFactor = 2; | |
| 48 static const int kStackLimit = 8 * 1024; | |
| 49 | |
| 50 enum Result { UNCHANGED, SUCCESS, BAILOUT, CIRCULAR, STACK_OVERFLOW }; | |
| 51 | |
| 52 template <bool is_ascii> void Extend(); | |
| 53 | |
| 54 void ChangeEncoding(); | |
| 55 | |
| 56 void ShrinkCurrentPart(); | |
| 57 | |
| 58 template <bool is_ascii, typename Char> | |
| 59 INLINE(void Append_(Char c)); | |
| 60 | |
| 61 template <bool is_ascii, typename Char> | |
| 62 INLINE(void AppendUnchecked_(Char c)); | |
| 63 | |
| 64 template <bool is_ascii, typename Char> | |
| 65 INLINE(void Append_(Char* chars)); | |
| 66 | |
| 67 template <bool is_ascii, typename Char> | |
| 68 INLINE(void Append_(const Char* chars)); | |
| 69 | |
| 70 template <bool is_ascii, typename Char> | |
| 71 INLINE(void AppendUnchecked_(const Char* chars)); | |
| 72 | |
| 73 INLINE(void Append(char c)) { | |
| 74 if (is_ascii_) { | |
| 75 Append_<true>(c); | |
| 76 } else { | |
| 77 Append_<false>(c); | |
| 78 } | |
| 79 } | |
| 80 | |
| 81 INLINE(void Append(const char* chars)) { | |
| 82 if (is_ascii_) { | |
| 83 Append_<true>(chars); | |
| 84 } else { | |
| 85 Append_<false>(chars); | |
| 86 } | |
| 87 } | |
| 88 | |
| 89 INLINE(Handle<Object> GetProperty(Handle<JSObject> object, | |
| 90 Handle<String> key)); | |
| 91 | |
| 92 INLINE(bool MayHaveToJsonFunction(Handle<JSObject> object)); | |
| 93 | |
| 94 INLINE(Result Serialize(Handle<Object> object)) { | |
| 95 return Serialize_<false>(object); | |
| 96 } | |
| 97 | |
| 98 INLINE(Result SerializeDeferred(Handle<Object> object, | |
| 99 bool deferred_comma, | |
| 100 Handle<String> deferred_key)) { | |
| 101 ASSERT(!deferred_key.is_null()); | |
| 102 return Serialize_<true>(object, deferred_comma, deferred_key); | |
| 103 } | |
| 104 | |
| 105 template <bool deferred_key> | |
| 106 Result Serialize_(Handle<Object> object, | |
| 107 bool comma = false, | |
| 108 Handle<String> key = Handle<String>::null()); | |
| 109 | |
| 110 INLINE(void SerializeDeferredKey(bool deferred_comma, | |
| 111 Handle<String> deferred_key)) { | |
| 112 if (deferred_comma) Append(','); | |
| 113 SerializeString(deferred_key); | |
| 114 Append(':'); | |
| 115 } | |
| 116 | |
| 117 INLINE(Result SerializeSmi(Smi* object)); | |
| 118 | |
| 119 INLINE(Result SerializeDouble(double number)); | |
| 120 INLINE(Result SerializeHeapNumber(Handle<HeapNumber> object)) { | |
| 121 return SerializeDouble(object->value()); | |
| 122 } | |
| 123 | |
| 124 Result SerializeArray(Handle<JSArray> object); | |
| 125 Result SerializeObject(Handle<JSObject> object); | |
| 126 | |
| 127 void SerializeString(Handle<String> object); | |
| 128 | |
| 129 template <bool is_ascii, typename Char> | |
| 130 INLINE(void SerializeString_(Vector<const Char> vector)); | |
| 131 | |
| 132 INLINE(Result StackPush(Handle<Object> object)); | |
| 133 INLINE(void StackPop()); | |
| 134 | |
| 135 INLINE(Handle<String> accumulator()) { | |
| 136 return Handle<String>(String::cast(accumulator_store_->value())); | |
| 137 } | |
| 138 | |
| 139 INLINE(void set_accumulator(Handle<String> string)) { | |
| 140 return accumulator_store_->set_value(*string); | |
| 141 } | |
| 142 | |
| 143 Isolate* isolate_; | |
| 144 // We use a value wrapper for the string accumulator to keep the | |
| 145 // (indirect) handle to it in the outermost handle scope. | |
| 146 Handle<JSValue> accumulator_store_; | |
| 147 Handle<String> current_part_; | |
| 148 Handle<String> tojson_symbol_; | |
| 149 Handle<JSArray> stack_; | |
| 150 int current_index_; | |
| 151 int part_length_; | |
| 152 bool is_ascii_; | |
| 153 | |
| 154 static const int kJsonQuotesCharactersPerEntry = 8; | |
| 155 static const char* const JsonQuotes; | |
| 156 }; | |
| 157 | |
| 158 | |
| 159 const char* const BasicJsonStringifier::JsonQuotes = | |
| 160 "\\u0000\0 \\u0001\0 \\u0002\0 \\u0003\0 " | |
| 161 "\\u0004\0 \\u0005\0 \\u0006\0 \\u0007\0 " | |
| 162 "\\b\0 \\t\0 \\n\0 \\u000b\0 " | |
| 163 "\\f\0 \\r\0 \\u000e\0 \\u000f\0 " | |
| 164 "\\u0010\0 \\u0011\0 \\u0012\0 \\u0013\0 " | |
| 165 "\\u0014\0 \\u0015\0 \\u0016\0 \\u0017\0 " | |
| 166 "\\u0018\0 \\u0019\0 \\u001a\0 \\u001b\0 " | |
| 167 "\\u001c\0 \\u001d\0 \\u001e\0 \\u001f\0 " | |
| 168 " \0 !\0 \\\"\0 #\0 " | |
| 169 "$\0 %\0 &\0 '\0 " | |
| 170 "(\0 )\0 *\0 +\0 " | |
| 171 ",\0 -\0 .\0 /\0 " | |
| 172 "0\0 1\0 2\0 3\0 " | |
| 173 "4\0 5\0 6\0 7\0 " | |
| 174 "8\0 9\0 :\0 ;\0 " | |
| 175 "<\0 =\0 >\0 ?\0 " | |
| 176 "@\0 A\0 B\0 C\0 " | |
| 177 "D\0 E\0 F\0 G\0 " | |
| 178 "H\0 I\0 J\0 K\0 " | |
| 179 "L\0 M\0 N\0 O\0 " | |
| 180 "P\0 Q\0 R\0 S\0 " | |
| 181 "T\0 U\0 V\0 W\0 " | |
| 182 "X\0 Y\0 Z\0 [\0 " | |
| 183 "\\\\\0 ]\0 ^\0 _\0 " | |
| 184 "`\0 a\0 b\0 c\0 " | |
| 185 "d\0 e\0 f\0 g\0 " | |
| 186 "h\0 i\0 j\0 k\0 " | |
| 187 "l\0 m\0 n\0 o\0 " | |
| 188 "p\0 q\0 r\0 s\0 " | |
| 189 "t\0 u\0 v\0 w\0 " | |
| 190 "x\0 y\0 z\0 {\0 " | |
| 191 "|\0 }\0 ~\0 \177\0 "; | |
| 192 | |
| 193 | |
| 194 BasicJsonStringifier::BasicJsonStringifier(Isolate* isolate) | |
| 195 : isolate_(isolate), current_index_(0), is_ascii_(true) { | |
| 196 accumulator_store_ = Handle<JSValue>::cast( | |
| 197 isolate_->factory()->ToObject(isolate_->factory()->empty_string())); | |
| 198 part_length_ = kInitialPartLength; | |
| 199 current_part_ = | |
| 200 isolate_->factory()->NewRawAsciiString(kInitialPartLength); | |
| 201 tojson_symbol_ = isolate_->factory()->LookupAsciiSymbol("toJSON"); | |
| 202 stack_ = isolate_->factory()->NewJSArray(8); | |
| 203 } | |
| 204 | |
| 205 | |
| 206 MaybeObject* BasicJsonStringifier::Stringify(Handle<Object> object) { | |
| 207 switch (Serialize(object)) { | |
| 208 case SUCCESS: | |
| 209 ShrinkCurrentPart(); | |
| 210 return *isolate_->factory()->NewConsString(accumulator(), current_part_); | |
| 211 case UNCHANGED: | |
| 212 return isolate_->heap()->undefined_value(); | |
| 213 case CIRCULAR: | |
| 214 return isolate_->Throw(*isolate_->factory()->NewTypeError( | |
| 215 "circular_structure", HandleVector<Object>(NULL, 0))); | |
| 216 case STACK_OVERFLOW: | |
| 217 return isolate_->StackOverflow(); | |
| 218 default: | |
| 219 return Smi::FromInt(0); | |
| 220 } | |
| 221 } | |
| 222 | |
| 223 | |
| 224 template <bool is_ascii, typename Char> | |
| 225 void BasicJsonStringifier::Append_(Char c) { | |
| 226 if (is_ascii) { | |
| 227 SeqAsciiString::cast(*current_part_)->SeqAsciiStringSet( | |
| 228 current_index_++, c); | |
| 229 } else { | |
| 230 SeqTwoByteString::cast(*current_part_)->SeqTwoByteStringSet( | |
| 231 current_index_++, c); | |
| 232 } | |
| 233 if (current_index_ == part_length_) Extend<is_ascii>(); | |
| 234 } | |
| 235 | |
| 236 | |
| 237 template <bool is_ascii, typename Char> | |
| 238 void BasicJsonStringifier::AppendUnchecked_(Char c) { | |
| 239 if (is_ascii) { | |
| 240 SeqAsciiString::cast(*current_part_)->SeqAsciiStringSet( | |
| 241 current_index_++, c); | |
| 242 } else { | |
| 243 SeqTwoByteString::cast(*current_part_)->SeqTwoByteStringSet( | |
| 244 current_index_++, c); | |
| 245 } | |
| 246 ASSERT(current_index_ < part_length_); | |
| 247 } | |
| 248 | |
| 249 | |
| 250 template <bool is_ascii, typename Char> | |
| 251 void BasicJsonStringifier::Append_(Char* chars) { | |
| 252 for ( ; *chars != '\0'; chars++) Append_<is_ascii>(*chars); | |
| 253 } | |
| 254 | |
| 255 | |
| 256 template <bool is_ascii, typename Char> | |
| 257 void BasicJsonStringifier::Append_(const Char* chars) { | |
| 258 for ( ; *chars != '\0'; chars++) Append_<is_ascii, Char>(*chars); | |
| 259 } | |
| 260 | |
| 261 | |
| 262 template <bool is_ascii, typename Char> | |
| 263 void BasicJsonStringifier::AppendUnchecked_(const Char* chars) { | |
| 264 for ( ; *chars != '\0'; chars++) AppendUnchecked_<is_ascii, Char>(*chars); | |
| 265 } | |
| 266 | |
| 267 | |
| 268 Handle<Object> BasicJsonStringifier::GetProperty(Handle<JSObject> object, | |
| 269 Handle<String> key) { | |
| 270 LookupResult lookup(isolate_); | |
| 271 object->LocalLookupRealNamedProperty(*key, &lookup); | |
| 272 if (!lookup.IsProperty()) return isolate_->factory()->undefined_value(); | |
| 273 switch (lookup.type()) { | |
| 274 case NORMAL: { | |
| 275 Object* value = lookup.holder()->GetNormalizedProperty(&lookup); | |
| 276 ASSERT(!value->IsTheHole()); | |
| 277 return Handle<Object>(value); | |
| 278 } | |
| 279 case FIELD: { | |
| 280 Object* value = lookup.holder()->FastPropertyAt(lookup.GetFieldIndex()); | |
| 281 ASSERT(!value->IsTheHole()); | |
| 282 return Handle<Object>(value); | |
| 283 } | |
| 284 case CONSTANT_FUNCTION: | |
| 285 return Handle<Object>(lookup.GetConstantFunction()); | |
| 286 case CALLBACKS: | |
| 287 case HANDLER: | |
| 288 case INTERCEPTOR: | |
| 289 return Handle<Object>::null(); | |
| 290 case TRANSITION: | |
| 291 case NONEXISTENT: | |
| 292 UNREACHABLE(); | |
| 293 break; | |
| 294 } | |
| 295 return Handle<Object>::null(); | |
| 296 } | |
| 297 | |
| 298 | |
| 299 bool BasicJsonStringifier::MayHaveToJsonFunction(Handle<JSObject> object) { | |
| 300 LookupResult lookup(isolate_); | |
| 301 object->LookupRealNamedProperty(*tojson_symbol_, &lookup); | |
| 302 if (!lookup.IsProperty()) return false; | |
| 303 Object* value; | |
| 304 switch (lookup.type()) { | |
| 305 case NORMAL: | |
| 306 value = lookup.holder()->GetNormalizedProperty(&lookup); | |
| 307 break; | |
| 308 case FIELD: | |
| 309 value = lookup.holder()->FastPropertyAt(lookup.GetFieldIndex()); | |
| 310 break; | |
| 311 default: | |
| 312 return true; | |
| 313 } | |
| 314 ASSERT(!value->IsTheHole()); | |
| 315 return value->IsSpecFunction(); | |
| 316 } | |
| 317 | |
| 318 | |
| 319 BasicJsonStringifier::Result BasicJsonStringifier::StackPush( | |
| 320 Handle<Object> object) { | |
| 321 int length = Smi::cast(stack_->length())->value(); | |
| 322 if (length > kStackLimit) return STACK_OVERFLOW; | |
| 323 FixedArray* elements = FixedArray::cast(stack_->elements()); | |
| 324 for (int i = 0; i < length; i++) { | |
| 325 if (elements->get(i) == *object) { | |
| 326 return CIRCULAR; | |
| 327 } | |
| 328 } | |
| 329 stack_->EnsureSize(length + 1); | |
| 330 FixedArray::cast(stack_->elements())->set(length, *object); | |
| 331 stack_->set_length(Smi::FromInt(length + 1)); | |
| 332 return SUCCESS; | |
| 333 } | |
| 334 | |
| 335 | |
| 336 void BasicJsonStringifier::StackPop() { | |
| 337 int length = Smi::cast(stack_->length())->value(); | |
| 338 stack_->set_length(Smi::FromInt(length - 1)); | |
| 339 } | |
| 340 | |
| 341 | |
| 342 template <bool deferred_key> | |
| 343 BasicJsonStringifier::Result BasicJsonStringifier::Serialize_( | |
| 344 Handle<Object> object, bool comma, Handle<String> key) { | |
| 345 if (object->IsJSObject()) { | |
| 346 // We don't deal with custom toJSON functions. | |
| 347 if (MayHaveToJsonFunction(Handle<JSObject>::cast(object))) return BAILOUT; | |
| 348 | |
| 349 if (object->IsJSFunction()) { | |
| 350 return UNCHANGED; | |
| 351 } else if (object->IsJSArray()) { | |
| 352 if (deferred_key) SerializeDeferredKey(comma, key); | |
| 353 return SerializeArray(Handle<JSArray>::cast(object)); | |
| 354 } else if (object->IsJSValue()) { | |
| 355 // JSValue with a custom prototype. | |
| 356 if (object->GetPrototype()->IsJSReceiver()) return BAILOUT; | |
| 357 // Unpack value wrapper and fall through. | |
| 358 object = Handle<Object>(JSValue::cast(*object)->value()); | |
| 359 } else { | |
| 360 if (deferred_key) SerializeDeferredKey(comma, key); | |
| 361 return SerializeObject(Handle<JSObject>::cast(object)); | |
| 362 } | |
| 363 } | |
| 364 | |
| 365 if (object->IsString()) { | |
| 366 if (deferred_key) SerializeDeferredKey(comma, key); | |
| 367 SerializeString(Handle<String>::cast(object)); | |
| 368 return SUCCESS; | |
| 369 } else if (object->IsSmi()) { | |
| 370 if (deferred_key) SerializeDeferredKey(comma, key); | |
| 371 return SerializeSmi(Smi::cast(*object)); | |
| 372 } else if (object->IsHeapNumber()) { | |
| 373 if (deferred_key) SerializeDeferredKey(comma, key); | |
| 374 return SerializeHeapNumber(Handle<HeapNumber>::cast(object)); | |
| 375 } else if (object->IsOddball()) { | |
| 376 switch (Oddball::cast(*object)->kind()) { | |
| 377 case Oddball::kFalse: | |
| 378 if (deferred_key) SerializeDeferredKey(comma, key); | |
| 379 Append("false"); | |
| 380 return SUCCESS; | |
| 381 case Oddball::kTrue: | |
| 382 if (deferred_key) SerializeDeferredKey(comma, key); | |
| 383 Append("true"); | |
| 384 return SUCCESS; | |
| 385 case Oddball::kNull: | |
| 386 if (deferred_key) SerializeDeferredKey(comma, key); | |
| 387 Append("null"); | |
| 388 return SUCCESS; | |
| 389 } | |
| 390 } | |
| 391 | |
| 392 return UNCHANGED; | |
| 393 } | |
| 394 | |
| 395 | |
| 396 BasicJsonStringifier::Result BasicJsonStringifier::SerializeSmi(Smi* object) { | |
| 397 static const int kBufferSize = 100; | |
| 398 char chars[kBufferSize]; | |
| 399 Vector<char> buffer(chars, kBufferSize); | |
| 400 Append(IntToCString(object->value(), buffer)); | |
| 401 return SUCCESS; | |
| 402 } | |
| 403 | |
| 404 | |
| 405 BasicJsonStringifier::Result BasicJsonStringifier::SerializeDouble( | |
| 406 double number) { | |
| 407 if (isinf(number) || isnan(number)) { | |
| 408 Append("null"); | |
| 409 return SUCCESS; | |
| 410 } | |
| 411 static const int kBufferSize = 100; | |
| 412 char chars[kBufferSize]; | |
| 413 Vector<char> buffer(chars, kBufferSize); | |
| 414 Append(DoubleToCString(number, buffer)); | |
| 415 return SUCCESS; | |
| 416 } | |
| 417 | |
| 418 | |
| 419 BasicJsonStringifier::Result BasicJsonStringifier::SerializeArray( | |
| 420 Handle<JSArray> object) { | |
| 421 HandleScope handle_scope(isolate_); | |
| 422 if (StackPush(object) == CIRCULAR) return CIRCULAR; | |
| 423 int length = Smi::cast(object->length())->value(); | |
| 424 Append('['); | |
| 425 switch (object->GetElementsKind()) { | |
| 426 case FAST_SMI_ELEMENTS: { | |
| 427 Handle<FixedArray> elements = Handle<FixedArray>( | |
| 428 FixedArray::cast(object->elements())); | |
| 429 for (int i = 0; i < length; i++) { | |
| 430 if (i > 0) Append(','); | |
| 431 SerializeSmi(Smi::cast(elements->get(i))); | |
| 432 } | |
| 433 break; | |
| 434 } | |
| 435 case FAST_HOLEY_SMI_ELEMENTS: { | |
| 436 Handle<FixedArray> elements = Handle<FixedArray>( | |
| 437 FixedArray::cast(object->elements())); | |
| 438 for (int i = 0; i < length; i++) { | |
| 439 if (i > 0) Append(','); | |
| 440 if (elements->is_the_hole(i)) { | |
| 441 Append("null"); | |
| 442 } else { | |
| 443 SerializeSmi(Smi::cast(elements->get(i))); | |
| 444 } | |
| 445 } | |
| 446 break; | |
| 447 } | |
| 448 case FAST_HOLEY_DOUBLE_ELEMENTS: | |
| 449 case FAST_DOUBLE_ELEMENTS: { | |
| 450 Handle<FixedDoubleArray> elements = Handle<FixedDoubleArray>( | |
| 451 FixedDoubleArray::cast(object->elements())); | |
| 452 for (int i = 0; i < length; i++) { | |
| 453 if (i > 0) Append(','); | |
| 454 SerializeDouble(elements->get_scalar(i)); | |
| 455 } | |
| 456 break; | |
| 457 } | |
| 458 case FAST_HOLEY_ELEMENTS: | |
| 459 case FAST_ELEMENTS: { | |
| 460 Handle<FixedArray> elements = Handle<FixedArray>( | |
| 461 FixedArray::cast(object->elements())); | |
| 462 for (int i = 0; i < length; i++) { | |
| 463 if (i > 0) Append(','); | |
| 464 Result result = Serialize(Handle<Object>(elements->get(i))); | |
| 465 if (result == SUCCESS) continue; | |
| 466 if (result == UNCHANGED) { | |
| 467 Append("null"); | |
| 468 } else { | |
| 469 return result; | |
| 470 } | |
| 471 } | |
| 472 break; | |
| 473 } | |
| 474 default: | |
| 475 return BAILOUT; | |
| 476 } | |
| 477 Append(']'); | |
| 478 StackPop(); | |
| 479 current_part_ = handle_scope.CloseAndEscape(current_part_); | |
| 480 return SUCCESS; | |
| 481 } | |
| 482 | |
| 483 | |
| 484 BasicJsonStringifier::Result BasicJsonStringifier::SerializeObject( | |
| 485 Handle<JSObject> object) { | |
| 486 HandleScope handle_scope(isolate_); | |
| 487 Result stack_push = StackPush(object); | |
| 488 if (stack_push != SUCCESS) return stack_push; | |
| 489 if (object->IsJSGlobalProxy()) return BAILOUT; | |
| 490 bool threw = false; | |
| 491 Handle<FixedArray> contents = | |
| 492 GetKeysInFixedArrayFor(object, LOCAL_ONLY, &threw); | |
| 493 if (threw) return BAILOUT; | |
| 494 Append('{'); | |
| 495 int length = contents->length(); | |
| 496 bool comma = false; | |
| 497 for (int i = 0; i < length; i++) { | |
| 498 Object* key = contents->get(i); | |
| 499 Handle<String> key_handle; | |
| 500 Handle<Object> property; | |
| 501 if (key->IsString()) { | |
| 502 key_handle = Handle<String>(String::cast(key)); | |
| 503 property = GetProperty(object, key_handle); | |
| 504 } else { | |
| 505 ASSERT(key->IsNumber()); | |
| 506 key_handle = isolate_->factory()->NumberToString(Handle<Object>(key)); | |
| 507 uint32_t index; | |
| 508 if (key->IsSmi()) { | |
| 509 property = Object::GetElement(object, Smi::cast(key)->value()); | |
| 510 } else if (key_handle->AsArrayIndex(&index)) { | |
| 511 property = Object::GetElement(object, index); | |
| 512 } else { | |
| 513 property = GetProperty(object, key_handle); | |
| 514 } | |
| 515 } | |
| 516 if (property.is_null()) return BAILOUT; | |
| 517 Result result = SerializeDeferred(property, comma, key_handle); | |
| 518 if (!comma && result == SUCCESS) comma = true; | |
| 519 if (result >= BAILOUT) return result; | |
| 520 } | |
| 521 Append('}'); | |
| 522 StackPop(); | |
| 523 current_part_ = handle_scope.CloseAndEscape(current_part_); | |
| 524 return SUCCESS; | |
| 525 } | |
| 526 | |
| 527 | |
| 528 void BasicJsonStringifier::ShrinkCurrentPart() { | |
| 529 ASSERT(current_index_ < part_length_); | |
| 530 if (current_index_ == 0) { | |
| 531 current_part_ = isolate_->factory()->empty_string(); | |
| 532 return; | |
| 533 } | |
| 534 | |
| 535 int string_size, allocated_string_size; | |
| 536 if (is_ascii_) { | |
| 537 allocated_string_size = SeqAsciiString::SizeFor(part_length_); | |
| 538 string_size = SeqAsciiString::SizeFor(current_index_); | |
| 539 } else { | |
| 540 allocated_string_size = SeqTwoByteString::SizeFor(part_length_); | |
| 541 string_size = SeqTwoByteString::SizeFor(current_index_); | |
| 542 } | |
| 543 | |
| 544 int delta = allocated_string_size - string_size; | |
| 545 current_part_->set_length(current_index_); | |
| 546 | |
| 547 // String sizes are pointer size aligned, so that we can use filler objects | |
| 548 // that are a multiple of pointer size. | |
| 549 Address end_of_string = current_part_->address() + string_size; | |
| 550 isolate_->heap()->CreateFillerObjectAt(end_of_string, delta); | |
| 551 if (Marking::IsBlack(Marking::MarkBitFrom(*current_part_))) { | |
| 552 MemoryChunk::IncrementLiveBytesFromMutator( | |
| 553 current_part_->address(), -delta); | |
| 554 } | |
| 555 } | |
| 556 | |
| 557 | |
| 558 template <bool is_ascii> | |
| 559 void BasicJsonStringifier::Extend() { | |
| 560 set_accumulator( | |
| 561 isolate_->factory()->NewConsString(accumulator(), current_part_)); | |
| 562 if (part_length_ <= kMaxPartLength / kPartLengthGrowthFactor) { | |
| 563 part_length_ *= kPartLengthGrowthFactor; | |
| 564 } | |
| 565 if (is_ascii) { | |
| 566 current_part_ = | |
| 567 isolate_->factory()->NewRawAsciiString(part_length_); | |
| 568 } else { | |
| 569 current_part_ = | |
| 570 isolate_->factory()->NewRawTwoByteString(part_length_); | |
| 571 } | |
| 572 current_index_ = 0; | |
| 573 } | |
| 574 | |
| 575 | |
| 576 void BasicJsonStringifier::ChangeEncoding() { | |
| 577 ShrinkCurrentPart(); | |
| 578 set_accumulator( | |
| 579 isolate_->factory()->NewConsString(accumulator(), current_part_)); | |
| 580 current_part_ = | |
| 581 isolate_->factory()->NewRawTwoByteString(part_length_); | |
| 582 current_index_ = 0; | |
| 583 is_ascii_ = false; | |
| 584 } | |
| 585 | |
| 586 | |
| 587 template <bool is_ascii, typename Char> | |
| 588 void BasicJsonStringifier::SerializeString_(Vector<const Char> vector) { | |
| 589 int length = vector.length(); | |
| 590 if (current_index_ + (length << 3) < (part_length_ - 2)) { | |
| 591 AppendUnchecked_<is_ascii, char>('"'); | |
| 592 for (int i = 0; i < length; i++) { | |
| 593 Char c = vector[i]; | |
| 594 if ((c >= '#' && c <= '~' && c != '\\') || | |
| 595 (!is_ascii && ((c & 0xFF80) != 0))) { | |
| 596 AppendUnchecked_<is_ascii, Char>(c); | |
| 597 } else { | |
| 598 AppendUnchecked_<is_ascii, char>( | |
| 599 &JsonQuotes[c * kJsonQuotesCharactersPerEntry]); | |
| 600 } | |
| 601 } | |
| 602 AppendUnchecked_<is_ascii, char>('"'); | |
| 603 } else { | |
| 604 Append_<is_ascii, char>('"'); | |
| 605 for (int i = 0; i < length; i++) { | |
| 606 Char c = vector[i]; | |
| 607 if ((c >= '#' && c <= '~' && c != '\\') || | |
| 608 (!is_ascii && ((c & 0xFF80) != 0))) { | |
| 609 Append_<is_ascii, Char>(c); | |
| 610 } else { | |
| 611 Append_<is_ascii, char>(&JsonQuotes[c * kJsonQuotesCharactersPerEntry]); | |
| 612 } | |
| 613 } | |
| 614 Append_<is_ascii, char>('"'); | |
| 615 } | |
| 616 } | |
| 617 | |
| 618 | |
| 619 void BasicJsonStringifier::SerializeString(Handle<String> object) { | |
| 620 FlattenString(object); | |
| 621 String::FlatContent flat = object->GetFlatContent(); | |
| 622 if (is_ascii_) { | |
| 623 if (flat.IsAscii()) { | |
| 624 SerializeString_<true, char>(flat.ToAsciiVector()); | |
| 625 } else { | |
| 626 ChangeEncoding(); | |
| 627 SerializeString(object); | |
| 628 } | |
| 629 } else { | |
| 630 if (flat.IsAscii()) { | |
| 631 SerializeString_<false, char>(flat.ToAsciiVector()); | |
| 632 } else { | |
| 633 SerializeString_<false, uc16>(flat.ToUC16Vector()); | |
| 634 } | |
| 635 } | |
| 636 } | |
| 637 | |
| 638 } } // namespace v8::internal | |
| 639 | |
| 640 #endif // V8_JSON_STRINGIFIER_H_ | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 11225026:
Revert r12760 (JSON.stringify). (Closed)
Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge