LCOV - code coverage report
Current view: top level - src - json-parser.cc (source / functions) Hit Total Coverage
Test: app.info Lines: 289 300 96.3 %
Date: 2017-04-26 Functions: 29 41 70.7 %

          Line data    Source code
       1             : // Copyright 2016 the V8 project authors. All rights reserved.
       2             : // Use of this source code is governed by a BSD-style license that can be
       3             : // found in the LICENSE file.
       4             : 
       5             : #include "src/json-parser.h"
       6             : 
       7             : #include "src/char-predicates-inl.h"
       8             : #include "src/conversions.h"
       9             : #include "src/debug/debug.h"
      10             : #include "src/factory.h"
      11             : #include "src/field-type.h"
      12             : #include "src/messages.h"
      13             : #include "src/objects-inl.h"
      14             : #include "src/parsing/token.h"
      15             : #include "src/property-descriptor.h"
      16             : #include "src/transitions.h"
      17             : #include "src/unicode-cache.h"
      18             : 
      19             : namespace v8 {
      20             : namespace internal {
      21             : 
      22         218 : MaybeHandle<Object> JsonParseInternalizer::Internalize(Isolate* isolate,
      23             :                                                        Handle<Object> object,
      24             :                                                        Handle<Object> reviver) {
      25             :   DCHECK(reviver->IsCallable());
      26             :   JsonParseInternalizer internalizer(isolate,
      27             :                                      Handle<JSReceiver>::cast(reviver));
      28             :   Handle<JSObject> holder =
      29         218 :       isolate->factory()->NewJSObject(isolate->object_function());
      30             :   Handle<String> name = isolate->factory()->empty_string();
      31         218 :   JSObject::AddProperty(holder, name, object, NONE);
      32         218 :   return internalizer.InternalizeJsonProperty(holder, name);
      33             : }
      34             : 
      35       68579 : MaybeHandle<Object> JsonParseInternalizer::InternalizeJsonProperty(
      36             :     Handle<JSReceiver> holder, Handle<String> name) {
      37       68579 :   HandleScope outer_scope(isolate_);
      38             :   Handle<Object> value;
      39      137158 :   ASSIGN_RETURN_ON_EXCEPTION(
      40             :       isolate_, value, Object::GetPropertyOrElement(holder, name), Object);
      41       68579 :   if (value->IsJSReceiver()) {
      42             :     Handle<JSReceiver> object = Handle<JSReceiver>::cast(value);
      43       34174 :     Maybe<bool> is_array = Object::IsArray(object);
      44       68042 :     if (is_array.IsNothing()) return MaybeHandle<Object>();
      45       34174 :     if (is_array.FromJust()) {
      46             :       Handle<Object> length_object;
      47       67936 :       ASSIGN_RETURN_ON_EXCEPTION(
      48             :           isolate_, length_object,
      49             :           Object::GetLengthFromArrayLike(isolate_, object), Object);
      50             :       double length = length_object->Number();
      51       68080 :       for (double i = 0; i < length; i++) {
      52       67980 :         HandleScope inner_scope(isolate_);
      53       67980 :         Handle<Object> index = isolate_->factory()->NewNumber(i);
      54       67980 :         Handle<String> name = isolate_->factory()->NumberToString(index);
      55       67980 :         if (!RecurseAndApply(object, name)) return MaybeHandle<Object>();
      56             :       }
      57             :     } else {
      58             :       Handle<FixedArray> contents;
      59         412 :       ASSIGN_RETURN_ON_EXCEPTION(
      60             :           isolate_, contents,
      61             :           KeyAccumulator::GetKeys(object, KeyCollectionMode::kOwnOnly,
      62             :                                   ENUMERABLE_STRINGS,
      63             :                                   GetKeysConversion::kConvertToString),
      64             :           Object);
      65         968 :       for (int i = 0; i < contents->length(); i++) {
      66         381 :         HandleScope inner_scope(isolate_);
      67         381 :         Handle<String> name(String::cast(contents->get(i)), isolate_);
      68         381 :         if (!RecurseAndApply(object, name)) return MaybeHandle<Object>();
      69             :       }
      70             :     }
      71             :   }
      72       34711 :   Handle<Object> argv[] = {name, value};
      73             :   Handle<Object> result;
      74       69422 :   ASSIGN_RETURN_ON_EXCEPTION(
      75             :       isolate_, result, Execution::Call(isolate_, reviver_, holder, 2, argv),
      76             :       Object);
      77       34697 :   return outer_scope.CloseAndEscape(result);
      78             : }
      79             : 
      80       68361 : bool JsonParseInternalizer::RecurseAndApply(Handle<JSReceiver> holder,
      81             :                                             Handle<String> name) {
      82             :   Handle<Object> result;
      83      136722 :   ASSIGN_RETURN_ON_EXCEPTION_VALUE(
      84             :       isolate_, result, InternalizeJsonProperty(holder, name), false);
      85             :   Maybe<bool> change_result = Nothing<bool>();
      86       68986 :   if (result->IsUndefined(isolate_)) {
      87         146 :     change_result = JSReceiver::DeletePropertyOrElement(holder, name, SLOPPY);
      88             :   } else {
      89             :     PropertyDescriptor desc;
      90             :     desc.set_value(result);
      91             :     desc.set_configurable(true);
      92             :     desc.set_enumerable(true);
      93             :     desc.set_writable(true);
      94             :     change_result = JSReceiver::DefineOwnProperty(isolate_, holder, name, &desc,
      95       34347 :                                                   Object::DONT_THROW);
      96             :   }
      97       34493 :   MAYBE_RETURN(change_result, false);
      98       34493 :   return true;
      99             : }
     100             : 
     101             : template <bool seq_one_byte>
     102      692509 : JsonParser<seq_one_byte>::JsonParser(Isolate* isolate, Handle<String> source)
     103             :     : source_(source),
     104             :       source_length_(source->length()),
     105             :       isolate_(isolate),
     106      692509 :       factory_(isolate_->factory()),
     107             :       zone_(isolate_->allocator(), ZONE_NAME),
     108      692509 :       object_constructor_(isolate_->native_context()->object_function(),
     109             :                           isolate_),
     110     4155054 :       position_(-1) {
     111      692509 :   source_ = String::Flatten(source_);
     112      692509 :   pretenure_ = (source_length_ >= kPretenureTreshold) ? TENURED : NOT_TENURED;
     113             : 
     114             :   // Optimized fast case where we only have Latin1 characters.
     115             :   if (seq_one_byte) {
     116      692456 :     seq_source_ = Handle<SeqOneByteString>::cast(source_);
     117             :   }
     118      692509 : }
     119             : 
     120             : template <bool seq_one_byte>
     121      692509 : MaybeHandle<Object> JsonParser<seq_one_byte>::ParseJson() {
     122             :   // Advance to the first character (possibly EOS)
     123             :   AdvanceSkipWhitespace();
     124      692509 :   Handle<Object> result = ParseJsonValue();
     125      692509 :   if (result.is_null() || c0_ != kEndOfString) {
     126             :     // Some exception (for example stack overflow) is already pending.
     127        1068 :     if (isolate_->has_pending_exception()) return Handle<Object>::null();
     128             : 
     129             :     // Parse failed. Current character is the unexpected token.
     130             :     Factory* factory = this->factory();
     131             :     MessageTemplate::Template message;
     132        1024 :     Handle<Object> arg1 = Handle<Smi>(Smi::FromInt(position_), isolate());
     133             :     Handle<Object> arg2;
     134             : 
     135        1024 :     switch (c0_) {
     136             :       case kEndOfString:
     137             :         message = MessageTemplate::kJsonParseUnexpectedEOS;
     138             :         break;
     139             :       case '-':
     140             :       case '0':
     141             :       case '1':
     142             :       case '2':
     143             :       case '3':
     144             :       case '4':
     145             :       case '5':
     146             :       case '6':
     147             :       case '7':
     148             :       case '8':
     149             :       case '9':
     150             :         message = MessageTemplate::kJsonParseUnexpectedTokenNumber;
     151         150 :         break;
     152             :       case '"':
     153             :         message = MessageTemplate::kJsonParseUnexpectedTokenString;
     154         195 :         break;
     155             :       default:
     156             :         message = MessageTemplate::kJsonParseUnexpectedToken;
     157         484 :         arg2 = arg1;
     158         484 :         arg1 = factory->LookupSingleCharacterStringFromCode(c0_);
     159         484 :         break;
     160             :     }
     161             : 
     162        1024 :     Handle<Script> script(factory->NewScript(source_));
     163             :     // We should sent compile error event because we compile JSON object in
     164             :     // separated source file.
     165        1024 :     isolate()->debug()->OnCompileError(script);
     166        1024 :     MessageLocation location(script, position_, position_ + 1);
     167        1024 :     Handle<Object> error = factory->NewSyntaxError(message, arg1, arg2);
     168             :     return isolate()->template Throw<Object>(error, &location);
     169             :   }
     170             :   return result;
     171             : }
     172             : 
     173             : MaybeHandle<Object> InternalizeJsonProperty(Handle<JSObject> holder,
     174             :                                             Handle<String> key);
     175             : 
     176             : template <bool seq_one_byte>
     177           0 : void JsonParser<seq_one_byte>::Advance() {
     178  1763647465 :   position_++;
     179  1763647465 :   if (position_ >= source_length_) {
     180      691621 :     c0_ = kEndOfString;
     181             :   } else if (seq_one_byte) {
     182  1755638267 :     c0_ = seq_source_->SeqOneByteStringGet(position_);
     183             :   } else {
     184     7317577 :     c0_ = source_->Get(position_);
     185             :   }
     186           0 : }
     187             : 
     188             : template <bool seq_one_byte>
     189           0 : void JsonParser<seq_one_byte>::AdvanceSkipWhitespace() {
     190   184128639 :   do {
     191             :     Advance();
     192             :   } while (c0_ == ' ' || c0_ == '\t' || c0_ == '\n' || c0_ == '\r');
     193           0 : }
     194             : 
     195             : template <bool seq_one_byte>
     196           0 : void JsonParser<seq_one_byte>::SkipWhitespace() {
     197     4064299 :   while (c0_ == ' ' || c0_ == '\t' || c0_ == '\n' || c0_ == '\r') {
     198             :     Advance();
     199             :   }
     200           0 : }
     201             : 
     202             : template <bool seq_one_byte>
     203           0 : uc32 JsonParser<seq_one_byte>::AdvanceGetChar() {
     204             :   Advance();
     205    45006525 :   return c0_;
     206             : }
     207             : 
     208             : template <bool seq_one_byte>
     209           0 : bool JsonParser<seq_one_byte>::MatchSkipWhiteSpace(uc32 c) {
     210    49105181 :   if (c0_ == c) {
     211             :     AdvanceSkipWhitespace();
     212             :     return true;
     213             :   }
     214             :   return false;
     215             : }
     216             : 
     217             : template <bool seq_one_byte>
     218    28264531 : bool JsonParser<seq_one_byte>::ParseJsonString(Handle<String> expected) {
     219             :   int length = expected->length();
     220    28264531 :   if (source_->length() - position_ - 1 > length) {
     221             :     DisallowHeapAllocation no_gc;
     222    28264531 :     String::FlatContent content = expected->GetFlatContent();
     223    28264531 :     if (content.IsOneByte()) {
     224             :       DCHECK_EQ('"', c0_);
     225    28264531 :       const uint8_t* input_chars = seq_source_->GetChars() + position_ + 1;
     226    28264531 :       const uint8_t* expected_chars = content.ToOneByteVector().start();
     227   273124829 :       for (int i = 0; i < length; i++) {
     228   244867361 :         uint8_t c0 = input_chars[i];
     229   244867361 :         if (c0 != expected_chars[i] || c0 == '"' || c0 < 0x20 || c0 == '\\') {
     230    28264525 :           return false;
     231             :         }
     232             :       }
     233    28257468 :       if (input_chars[length] == '"') {
     234    28257462 :         position_ = position_ + length + 1;
     235             :         AdvanceSkipWhitespace();
     236             :         return true;
     237             :       }
     238             :     }
     239             :   }
     240             :   return false;
     241             : }
     242             : 
     243             : // Parse any JSON value.
     244             : template <bool seq_one_byte>
     245    49876556 : Handle<Object> JsonParser<seq_one_byte>::ParseJsonValue() {
     246    49876556 :   StackLimitCheck stack_check(isolate_);
     247    49876556 :   if (stack_check.HasOverflowed()) {
     248          44 :     isolate_->StackOverflow();
     249             :     return Handle<Object>::null();
     250             :   }
     251             : 
     252    49876706 :   if (stack_check.InterruptRequested() &&
     253         194 :       isolate_->stack_guard()->HandleInterrupts()->IsException(isolate_)) {
     254             :     return Handle<Object>::null();
     255             :   }
     256             : 
     257    71301489 :   if (c0_ == '"') return ParseJsonString();
     258    28451535 :   if ((c0_ >= '0' && c0_ <= '9') || c0_ == '-') return ParseJsonNumber();
     259    24678771 :   if (c0_ == '{') return ParseJsonObject();
     260    14588392 :   if (c0_ == '[') return ParseJsonArray();
     261    13992559 :   if (c0_ == 'f') {
     262    12116939 :     if (AdvanceGetChar() == 'a' && AdvanceGetChar() == 'l' &&
     263             :         AdvanceGetChar() == 's' && AdvanceGetChar() == 'e') {
     264             :       AdvanceSkipWhitespace();
     265     3029231 :       return factory()->false_value();
     266             :     }
     267             :     return ReportUnexpectedCharacter();
     268             :   }
     269    10963313 :   if (c0_ == 't') {
     270    32878947 :     if (AdvanceGetChar() == 'r' && AdvanceGetChar() == 'u' &&
     271             :         AdvanceGetChar() == 'e') {
     272             :       AdvanceSkipWhitespace();
     273    10959649 :       return factory()->true_value();
     274             :     }
     275             :     return ReportUnexpectedCharacter();
     276             :   }
     277        3664 :   if (c0_ == 'n') {
     278       10639 :     if (AdvanceGetChar() == 'u' && AdvanceGetChar() == 'l' &&
     279             :         AdvanceGetChar() == 'l') {
     280             :       AdvanceSkipWhitespace();
     281        3546 :       return factory()->null_value();
     282             :     }
     283             :     return ReportUnexpectedCharacter();
     284             :   }
     285             :   return ReportUnexpectedCharacter();
     286             : }
     287             : 
     288             : template <bool seq_one_byte>
     289      264494 : ParseElementResult JsonParser<seq_one_byte>::ParseElement(
     290             :     Handle<JSObject> json_object) {
     291             :   uint32_t index = 0;
     292             :   // Maybe an array index, try to parse it.
     293      264494 :   if (c0_ == '0') {
     294             :     // With a leading zero, the string has to be "0" only to be an index.
     295             :     Advance();
     296             :   } else {
     297      584055 :     do {
     298      584070 :       int d = c0_ - '0';
     299      584070 :       if (index > 429496729U - ((d + 3) >> 3)) break;
     300      584055 :       index = (index * 10) + d;
     301             :       Advance();
     302      584055 :     } while (IsDecimalDigit(c0_));
     303             :   }
     304             : 
     305      264494 :   if (c0_ == '"') {
     306             :     // Successfully parsed index, parse and store element.
     307             :     AdvanceSkipWhitespace();
     308             : 
     309      264419 :     if (c0_ == ':') {
     310             :       AdvanceSkipWhitespace();
     311      264419 :       Handle<Object> value = ParseJsonValue();
     312      264419 :       if (!value.is_null()) {
     313             :         JSObject::SetOwnElementIgnoreAttributes(json_object, index, value, NONE)
     314      264404 :             .Assert();
     315      264404 :         return kElementFound;
     316             :       } else {
     317             :         return kNullHandle;
     318             :       }
     319             :     }
     320             :   }
     321             :   return kElementNotFound;
     322             : }
     323             : 
     324             : // Parse a JSON object. Position must be right at '{'.
     325             : template <bool seq_one_byte>
     326    10090379 : Handle<Object> JsonParser<seq_one_byte>::ParseJsonObject() {
     327             :   HandleScope scope(isolate());
     328             :   Handle<JSObject> json_object =
     329    20180758 :       factory()->NewJSObject(object_constructor(), pretenure_);
     330             :   Handle<Map> map(json_object->map());
     331             :   int descriptor = 0;
     332    10090379 :   ZoneList<Handle<Object> > properties(8, zone());
     333             :   DCHECK_EQ(c0_, '{');
     334             : 
     335             :   bool transitioning = true;
     336             : 
     337             :   AdvanceSkipWhitespace();
     338    10090379 :   if (c0_ != '}') {
     339    86536444 :     do {
     340    43341622 :       if (c0_ != '"') return ReportUnexpectedCharacter();
     341             : 
     342    43341210 :       int start_position = position_;
     343             :       Advance();
     344             : 
     345    86682420 :       if (IsDecimalDigit(c0_)) {
     346      264494 :         ParseElementResult element_result = ParseElement(json_object);
     347      264494 :         if (element_result == kNullHandle) return Handle<Object>::null();
     348    43459855 :         if (element_result == kElementFound) continue;
     349             :       }
     350             :       // Not an index, fallback to the slow path.
     351             : 
     352    43076791 :       position_ = start_position;
     353             : #ifdef DEBUG
     354             :       c0_ = '"';
     355             : #endif
     356             : 
     357             :       Handle<String> key;
     358             :       Handle<Object> value;
     359             : 
     360             :       // Try to follow existing transitions as long as possible. Once we stop
     361             :       // transitioning, no transition can be found anymore.
     362             :       DCHECK(transitioning);
     363             :       // First check whether there is a single expected transition. If so, try
     364             :       // to parse it first.
     365             :       bool follow_expected = false;
     366             :       Handle<Map> target;
     367             :       if (seq_one_byte) {
     368    42976723 :         key = TransitionArray::ExpectedTransitionKey(map);
     369    42976723 :         follow_expected = !key.is_null() && ParseJsonString(key);
     370             :       }
     371             :       // If the expected transition hits, follow it.
     372    42976723 :       if (follow_expected) {
     373    28257462 :         target = TransitionArray::ExpectedTransitionTarget(map);
     374             :       } else {
     375             :         // If the expected transition failed, parse an internalized string and
     376             :         // try to find a matching transition.
     377    14819329 :         key = ParseJsonInternalizedString();
     378    14819329 :         if (key.is_null()) return ReportUnexpectedCharacter();
     379             : 
     380    14819224 :         target = TransitionArray::FindTransitionToField(map, key);
     381             :         // If a transition was found, follow it and continue.
     382    14819224 :         transitioning = !target.is_null();
     383             :       }
     384    43076686 :       if (c0_ != ':') return ReportUnexpectedCharacter();
     385             : 
     386             :       AdvanceSkipWhitespace();
     387    43076686 :       value = ParseJsonValue();
     388    43076686 :       if (value.is_null()) return ReportUnexpectedCharacter();
     389             : 
     390    43076664 :       if (transitioning) {
     391             :         PropertyDetails details =
     392    42935249 :             target->instance_descriptors()->GetDetails(descriptor);
     393             :         Representation expected_representation = details.representation();
     394             : 
     395    42935249 :         if (value->FitsRepresentation(expected_representation)) {
     396    83492391 :           if (expected_representation.IsHeapObject() &&
     397             :               !target->instance_descriptors()
     398             :                    ->GetFieldType(descriptor)
     399    40561419 :                    ->NowContains(value)) {
     400             :             Handle<FieldType> value_type(
     401       18742 :                 value->OptimalType(isolate(), expected_representation));
     402       18742 :             Map::GeneralizeField(target, descriptor, details.constness(),
     403             :                                  expected_representation, value_type);
     404             :           }
     405             :           DCHECK(target->instance_descriptors()
     406             :                      ->GetFieldType(descriptor)
     407             :                      ->NowContains(value));
     408             :           properties.Add(value, zone());
     409    42930972 :           map = target;
     410    42930972 :           descriptor++;
     411             :           continue;
     412             :         } else {
     413             :           transitioning = false;
     414             :         }
     415             :       }
     416             : 
     417             :       DCHECK(!transitioning);
     418             : 
     419             :       // Commit the intermediate state to the object and stop transitioning.
     420      145692 :       CommitStateToJsonObject(json_object, map, &properties);
     421             : 
     422             :       JSObject::DefinePropertyOrElementIgnoreAttributes(json_object, key, value)
     423      291384 :           .Check();
     424             :     } while (transitioning && MatchSkipWhiteSpace(','));
     425             : 
     426             :     // If we transitioned until the very end, transition the map now.
     427     9944865 :     if (transitioning) {
     428     9799173 :       CommitStateToJsonObject(json_object, map, &properties);
     429             :     } else {
     430      527958 :       while (MatchSkipWhiteSpace(',')) {
     431             :         HandleScope local_scope(isolate());
     432      382266 :         if (c0_ != '"') return ReportUnexpectedCharacter();
     433             : 
     434      382266 :         int start_position = position_;
     435             :         Advance();
     436             : 
     437      764532 :         if (IsDecimalDigit(c0_)) {
     438           0 :           ParseElementResult element_result = ParseElement(json_object);
     439           0 :           if (element_result == kNullHandle) return Handle<Object>::null();
     440           0 :           if (element_result == kElementFound) continue;
     441             :         }
     442             :         // Not an index, fallback to the slow path.
     443             : 
     444      382266 :         position_ = start_position;
     445             : #ifdef DEBUG
     446             :         c0_ = '"';
     447             : #endif
     448             : 
     449             :         Handle<String> key;
     450             :         Handle<Object> value;
     451             : 
     452      382266 :         key = ParseJsonInternalizedString();
     453      382266 :         if (key.is_null() || c0_ != ':') return ReportUnexpectedCharacter();
     454             : 
     455             :         AdvanceSkipWhitespace();
     456      382266 :         value = ParseJsonValue();
     457      382266 :         if (value.is_null()) return ReportUnexpectedCharacter();
     458             : 
     459             :         JSObject::DefinePropertyOrElementIgnoreAttributes(json_object, key,
     460             :                                                           value)
     461      764532 :             .Check();
     462             :       }
     463             :     }
     464             : 
     465     9944865 :     if (c0_ != '}') {
     466             :       return ReportUnexpectedCharacter();
     467             :     }
     468             :   }
     469             :   AdvanceSkipWhitespace();
     470    10090087 :   return scope.CloseAndEscape(json_object);
     471             : }
     472             : 
     473             : template <bool seq_one_byte>
     474     9944865 : void JsonParser<seq_one_byte>::CommitStateToJsonObject(
     475             :     Handle<JSObject> json_object, Handle<Map> map,
     476             :     ZoneList<Handle<Object> >* properties) {
     477     9944865 :   JSObject::AllocateStorageForMap(json_object, map);
     478             :   DCHECK(!json_object->map()->is_dictionary_map());
     479             : 
     480             :   DisallowHeapAllocation no_gc;
     481             :   DescriptorArray* descriptors = json_object->map()->instance_descriptors();
     482    52875813 :   int length = properties->length();
     483    52875813 :   for (int i = 0; i < length; i++) {
     484    42930948 :     Handle<Object> value = (*properties)[i];
     485             :     // Initializing store.
     486    85861896 :     json_object->WriteToField(i, descriptors->GetDetails(i), *value);
     487             :   }
     488     9944865 : }
     489             : 
     490             : // Parse a JSON array. Position must be right at '['.
     491             : template <bool seq_one_byte>
     492      595833 : Handle<Object> JsonParser<seq_one_byte>::ParseJsonArray() {
     493             :   HandleScope scope(isolate());
     494      595833 :   ZoneList<Handle<Object> > elements(4, zone());
     495             :   DCHECK_EQ(c0_, '[');
     496             : 
     497             :   AdvanceSkipWhitespace();
     498      595833 :   if (c0_ != ']') {
     499     5381847 :     do {
     500     5460676 :       Handle<Object> element = ParseJsonValue();
     501     5460676 :       if (element.is_null()) return ReportUnexpectedCharacter();
     502             :       elements.Add(element, zone());
     503             :     } while (MatchSkipWhiteSpace(','));
     504      438675 :     if (c0_ != ']') {
     505             :       return ReportUnexpectedCharacter();
     506             :     }
     507             :   }
     508             :   AdvanceSkipWhitespace();
     509             :   // Allocate a fixed array with all the elements.
     510             :   Handle<FixedArray> fast_elements =
     511     1033978 :       factory()->NewFixedArray(elements.length(), pretenure_);
     512     5820085 :   for (int i = 0, n = elements.length(); i < n; i++) {
     513    10606192 :     fast_elements->set(i, *elements[i]);
     514             :   }
     515             :   Handle<Object> json_array = factory()->NewJSArrayWithElements(
     516      516989 :       fast_elements, FAST_ELEMENTS, pretenure_);
     517      516989 :   return scope.CloseAndEscape(json_array);
     518             : }
     519             : 
     520             : template <bool seq_one_byte>
     521     3772764 : Handle<Object> JsonParser<seq_one_byte>::ParseJsonNumber() {
     522             :   bool negative = false;
     523     3772764 :   int beg_pos = position_;
     524     3772764 :   if (c0_ == '-') {
     525             :     Advance();
     526             :     negative = true;
     527             :   }
     528     3772764 :   if (c0_ == '0') {
     529             :     Advance();
     530             :     // Prefix zero is only allowed if it's the only digit before
     531             :     // a decimal point or exponent.
     532     1551238 :     if (IsDecimalDigit(c0_)) return ReportUnexpectedCharacter();
     533             :   } else {
     534             :     int i = 0;
     535             :     int digits = 0;
     536     2997145 :     if (c0_ < '1' || c0_ > '9') return ReportUnexpectedCharacter();
     537     6350546 :     do {
     538     6350546 :       i = i * 10 + c0_ - '0';
     539     6350546 :       digits++;
     540             :       Advance();
     541     6350546 :     } while (IsDecimalDigit(c0_));
     542     2997100 :     if (c0_ != '.' && c0_ != 'e' && c0_ != 'E' && digits < 10) {
     543             :       SkipWhitespace();
     544     5939800 :       return Handle<Smi>(Smi::FromInt((negative ? -i : i)), isolate());
     545             :     }
     546             :   }
     547      802804 :   if (c0_ == '.') {
     548             :     Advance();
     549      354676 :     if (!IsDecimalDigit(c0_)) return ReportUnexpectedCharacter();
     550      207995 :     do {
     551             :       Advance();
     552      207995 :     } while (IsDecimalDigit(c0_));
     553             :   }
     554     1605518 :   if (AsciiAlphaToLower(c0_) == 'e') {
     555             :     Advance();
     556         165 :     if (c0_ == '-' || c0_ == '+') Advance();
     557         330 :     if (!IsDecimalDigit(c0_)) return ReportUnexpectedCharacter();
     558          90 :     do {
     559             :       Advance();
     560          90 :     } while (IsDecimalDigit(c0_));
     561             :   }
     562      802684 :   int length = position_ - beg_pos;
     563             :   double number;
     564             :   if (seq_one_byte) {
     565      730157 :     Vector<const uint8_t> chars(seq_source_->GetChars() + beg_pos, length);
     566      730157 :     number = StringToDouble(isolate()->unicode_cache(), chars,
     567             :                             NO_FLAGS,  // Hex, octal or trailing junk.
     568      730157 :                             std::numeric_limits<double>::quiet_NaN());
     569             :   } else {
     570             :     Vector<uint8_t> buffer = Vector<uint8_t>::New(length);
     571      145054 :     String::WriteToFlat(*source_, buffer.start(), beg_pos, position_);
     572             :     Vector<const uint8_t> result =
     573             :         Vector<const uint8_t>(buffer.start(), length);
     574       72527 :     number = StringToDouble(isolate()->unicode_cache(), result,
     575             :                             NO_FLAGS,  // Hex, octal or trailing junk.
     576       72527 :                             0.0);
     577             :     buffer.Dispose();
     578             :   }
     579             :   SkipWhitespace();
     580     1605368 :   return factory()->NewNumber(number, pretenure_);
     581             : }
     582             : 
     583             : template <typename StringType>
     584             : inline void SeqStringSet(Handle<StringType> seq_str, int i, uc32 c);
     585             : 
     586             : template <>
     587             : inline void SeqStringSet(Handle<SeqTwoByteString> seq_str, int i, uc32 c) {
     588      571509 :   seq_str->SeqTwoByteStringSet(i, c);
     589             : }
     590             : 
     591             : template <>
     592             : inline void SeqStringSet(Handle<SeqOneByteString> seq_str, int i, uc32 c) {
     593  1128083910 :   seq_str->SeqOneByteStringSet(i, c);
     594             : }
     595             : 
     596             : template <typename StringType>
     597             : inline Handle<StringType> NewRawString(Factory* factory, int length,
     598             :                                        PretenureFlag pretenure);
     599             : 
     600             : template <>
     601       50057 : inline Handle<SeqTwoByteString> NewRawString(Factory* factory, int length,
     602             :                                              PretenureFlag pretenure) {
     603      100114 :   return factory->NewRawTwoByteString(length, pretenure).ToHandleChecked();
     604             : }
     605             : 
     606             : template <>
     607     9251255 : inline Handle<SeqOneByteString> NewRawString(Factory* factory, int length,
     608             :                                              PretenureFlag pretenure) {
     609    18502510 :   return factory->NewRawOneByteString(length, pretenure).ToHandleChecked();
     610             : }
     611             : 
     612             : // Scans the rest of a JSON string starting from position_ and writes
     613             : // prefix[start..end] along with the scanned characters into a
     614             : // sequential string of type StringType.
     615             : template <bool seq_one_byte>
     616             : template <typename StringType, typename SinkChar>
     617     9301312 : Handle<String> JsonParser<seq_one_byte>::SlowScanJsonString(
     618             :     Handle<String> prefix, int start, int end) {
     619     9301312 :   int count = end - start;
     620     9301312 :   int max_length = count + source_length_ - position_;
     621     9301312 :   int length = Min(max_length, Max(kInitialSpecialStringLength, 2 * count));
     622             :   Handle<StringType> seq_string =
     623    18602624 :       NewRawString<StringType>(factory(), length, pretenure_);
     624             :   // Copy prefix into seq_str.
     625     9301312 :   SinkChar* dest = seq_string->GetChars();
     626     9301312 :   String::WriteToFlat(*prefix, dest, start, end);
     627             : 
     628  1179031199 :   while (c0_ != '"') {
     629             :     // Check for control character (0x00-0x1f) or unterminated string (<0).
     630  1164701115 :     if (c0_ < 0x20) return Handle<String>::null();
     631  1164701040 :     if (count >= length) {
     632             :       // We need to create a longer sequential string for the result.
     633     4272339 :       return SlowScanJsonString<StringType, SinkChar>(seq_string, 0, count);
     634             :     }
     635  1160428701 :     if (c0_ != '\\') {
     636             :       // If the sink can contain UC16 characters, or source_ contains only
     637             :       // Latin1 characters, there's no need to test whether we can store the
     638             :       // character. Otherwise check whether the UC16 source character can fit
     639             :       // in the Latin1 sink.
     640       78273 :       if (sizeof(SinkChar) == kUC16Size || seq_one_byte ||
     641             :           c0_ <= String::kMaxOneByteCharCode) {
     642  1103468998 :         SeqStringSet(seq_string, count++, c0_);
     643             :         Advance();
     644             :       } else {
     645             :         // StringType is SeqOneByteString and we just read a non-Latin1 char.
     646          15 :         return SlowScanJsonString<SeqTwoByteString, uc16>(seq_string, 0, count);
     647             :       }
     648             :     } else {
     649             :       Advance();  // Advance past the \.
     650    56959688 :       switch (c0_) {
     651             :         case '"':
     652             :         case '\\':
     653             :         case '/':
     654    22771529 :           SeqStringSet(seq_string, count++, c0_);
     655             :           break;
     656             :         case 'b':
     657          21 :           SeqStringSet(seq_string, count++, '\x08');
     658             :           break;
     659             :         case 'f':
     660          15 :           SeqStringSet(seq_string, count++, '\x0c');
     661             :           break;
     662             :         case 'n':
     663    31773084 :           SeqStringSet(seq_string, count++, '\x0a');
     664             :           break;
     665             :         case 'r':
     666          21 :           SeqStringSet(seq_string, count++, '\x0d');
     667             :           break;
     668             :         case 't':
     669          15 :           SeqStringSet(seq_string, count++, '\x09');
     670             :           break;
     671             :         case 'u': {
     672             :           uc32 value = 0;
     673     9659697 :           for (int i = 0; i < 4; i++) {
     674             :             Advance();
     675     9659712 :             int digit = HexValue(c0_);
     676     9659712 :             if (digit < 0) {
     677             :               return Handle<String>::null();
     678             :             }
     679     9659697 :             value = value * 16 + digit;
     680             :           }
     681     2414880 :           if (sizeof(SinkChar) == kUC16Size ||
     682             :               value <= String::kMaxOneByteCharCode) {
     683     2414892 :             SeqStringSet(seq_string, count++, value);
     684             :             break;
     685             :           } else {
     686             :             // StringType is SeqOneByteString and we just read a non-Latin1
     687             :             // char.
     688          21 :             position_ -= 6;  // Rewind position_ to \ in \uxxxx.
     689             :             Advance();
     690          21 :             return SlowScanJsonString<SeqTwoByteString, uc16>(seq_string, 0,
     691          21 :                                                               count);
     692             :           }
     693             :         }
     694             :         default:
     695             :           return Handle<String>::null();
     696             :       }
     697             :       Advance();
     698             :     }
     699             :   }
     700             : 
     701             :   DCHECK_EQ('"', c0_);
     702             :   // Advance past the last '"'.
     703             :   AdvanceSkipWhitespace();
     704             : 
     705             :   // Shrink seq_string length to count and return.
     706     5028772 :   return SeqString::Truncate(seq_string, count);
     707             : }
     708             : 
     709             : template <bool seq_one_byte>
     710             : template <bool is_internalized>
     711    36626572 : Handle<String> JsonParser<seq_one_byte>::ScanJsonString() {
     712             :   DCHECK_EQ('"', c0_);
     713             :   Advance();
     714    36626572 :   if (c0_ == '"') {
     715             :     AdvanceSkipWhitespace();
     716             :     return factory()->empty_string();
     717             :   }
     718             : 
     719             :   if (seq_one_byte && is_internalized) {
     720             :     // Fast path for existing internalized strings.  If the the string being
     721             :     // parsed is not a known internalized string, contains backslashes or
     722             :     // unexpectedly reaches the end of string, return with an empty handle.
     723             : 
     724             :     // We intentionally use local variables instead of fields, compute hash
     725             :     // while we are iterating a string and manually inline StringTable lookup
     726             :     // here.
     727             :     uint32_t running_hash = isolate()->heap()->HashSeed();
     728    15051436 :     int position = position_;
     729             :     uc32 c0 = c0_;
     730    90004030 :     do {
     731    90004120 :       if (c0 == '\\') {
     732          45 :         c0_ = c0;
     733             :         int beg_pos = position_;
     734          45 :         position_ = position;
     735             :         return SlowScanJsonString<SeqOneByteString, uint8_t>(source_, beg_pos,
     736          45 :                                                              position_);
     737             :       }
     738    90004075 :       if (c0 < 0x20) {
     739          30 :         c0_ = c0;
     740          30 :         position_ = position;
     741             :         return Handle<String>::null();
     742             :       }
     743             :       running_hash = StringHasher::AddCharacterCore(running_hash,
     744    90004045 :                                                     static_cast<uint16_t>(c0));
     745    90004045 :       position++;
     746    90004045 :       if (position >= source_length_) {
     747          15 :         c0_ = kEndOfString;
     748          15 :         position_ = position;
     749             :         return Handle<String>::null();
     750             :       }
     751    90004030 :       c0 = seq_source_->SeqOneByteStringGet(position);
     752             :     } while (c0 != '"');
     753    15051346 :     int length = position - position_;
     754             :     uint32_t hash = (length <= String::kMaxHashCalcLength)
     755             :                         ? StringHasher::GetHashCore(running_hash)
     756    15051346 :                         : static_cast<uint32_t>(length);
     757    15051346 :     Vector<const uint8_t> string_vector(seq_source_->GetChars() + position_,
     758    15051346 :                                         length);
     759    15051346 :     StringTable* string_table = isolate()->heap()->string_table();
     760    15051346 :     uint32_t capacity = string_table->Capacity();
     761             :     uint32_t entry = StringTable::FirstProbe(hash, capacity);
     762             :     uint32_t count = 1;
     763             :     Handle<String> result;
     764             :     while (true) {
     765    21037592 :       Object* element = string_table->KeyAt(entry);
     766    21037592 :       if (element->IsUndefined(isolate())) {
     767             :         // Lookup failure.
     768      230098 :         result =
     769             :             factory()->InternalizeOneByteString(seq_source_, position_, length);
     770      115049 :         break;
     771             :       }
     772    41662995 :       if (!element->IsTheHole(isolate()) &&
     773    20740452 :           String::cast(element)->IsOneByteEqualTo(string_vector)) {
     774             :         result = Handle<String>(String::cast(element), isolate());
     775             : #ifdef DEBUG
     776             :         uint32_t hash_field =
     777             :             (hash << String::kHashShift) | String::kIsNotArrayIndexMask;
     778             :         DCHECK_EQ(static_cast<int>(result->Hash()),
     779             :                   static_cast<int>(hash_field >> String::kHashShift));
     780             : #endif
     781    14936297 :         break;
     782             :       }
     783     5986246 :       entry = StringTable::NextProbe(entry, count++, capacity);
     784             :     }
     785    15051346 :     position_ = position;
     786             :     // Advance past the last '"'.
     787             :     AdvanceSkipWhitespace();
     788    21037592 :     return result;
     789             :   }
     790             : 
     791    21428065 :   int beg_pos = position_;
     792             :   // Fast case for Latin1 only without escape characters.
     793   218611541 :   do {
     794             :     // Check for control character (0x00-0x1f) or unterminated string (<0).
     795   223640478 :     if (c0_ < 0x20) return Handle<String>::null();
     796   223640433 :     if (c0_ != '\\') {
     797      969864 :       if (seq_one_byte || c0_ <= String::kMaxOneByteCharCode) {
     798             :         Advance();
     799             :       } else {
     800       50021 :         return SlowScanJsonString<SeqTwoByteString, uc16>(source_, beg_pos,
     801       50021 :                                                           position_);
     802             :       }
     803             :     } else {
     804     4978871 :       return SlowScanJsonString<SeqOneByteString, uint8_t>(source_, beg_pos,
     805     4978871 :                                                            position_);
     806             :     }
     807             :   } while (c0_ != '"');
     808    16399128 :   int length = position_ - beg_pos;
     809             :   Handle<String> result =
     810    49197384 :       factory()->NewRawOneByteString(length, pretenure_).ToHandleChecked();
     811    16399128 :   uint8_t* dest = SeqOneByteString::cast(*result)->GetChars();
     812    32798256 :   String::WriteToFlat(*source_, dest, beg_pos, position_);
     813             : 
     814             :   DCHECK_EQ('"', c0_);
     815             :   // Advance past the last '"'.
     816             :   AdvanceSkipWhitespace();
     817    16399128 :   return result;
     818             : }
     819             : 
     820             : // Explicit instantiation.
     821             : template class JsonParser<true>;
     822             : template class JsonParser<false>;
     823             : 
     824             : }  // namespace internal
     825             : }  // namespace v8

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