src/factory.h

   1 // Copyright 2014 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 #ifndef V8_FACTORY_H_
   6 #define V8_FACTORY_H_
   7
   8 #include "src/isolate.h"
   9 #include "src/messages.h"
  10
  11 namespace v8 {
  12 namespace internal {
  13
  14 class FeedbackVectorSpec;
  15
  16 // Interface for handle based allocation.
  17 class Factory final {
  18  public:
  19   Handle<Oddball> NewOddball(Handle<Map> map,
  20                              const char* to_string,
  21                              Handle<Object> to_number,
  22                              byte kind);
  23
  24   // Allocates a fixed array initialized with undefined values.
  25   Handle<FixedArray> NewFixedArray(
  26       int size,
  27       PretenureFlag pretenure = NOT_TENURED);
  28
  29   // Allocate a new fixed array with non-existing entries (the hole).
  30   Handle<FixedArray> NewFixedArrayWithHoles(
  31       int size,
  32       PretenureFlag pretenure = NOT_TENURED);
  33
  34   // Allocates an uninitialized fixed array. It must be filled by the caller.
  35   Handle<FixedArray> NewUninitializedFixedArray(int size);
  36
  37   // Allocate a new uninitialized fixed double array.
  38   // The function returns a pre-allocated empty fixed array for capacity = 0,
  39   // so the return type must be the general fixed array class.
  40   Handle<FixedArrayBase> NewFixedDoubleArray(
  41       int size,
  42       PretenureFlag pretenure = NOT_TENURED);
  43
  44   // Allocate a new fixed double array with hole values.
  45   Handle<FixedArrayBase> NewFixedDoubleArrayWithHoles(
  46       int size,
  47       PretenureFlag pretenure = NOT_TENURED);
  48
  49   Handle<OrderedHashSet> NewOrderedHashSet();
  50   Handle<OrderedHashMap> NewOrderedHashMap();
  51
  52   // Create a new boxed value.
  53   Handle<Box> NewBox(Handle<Object> value);
  54
  55   // Create a new PrototypeInfo struct.
  56   Handle<PrototypeInfo> NewPrototypeInfo();
  57
  58   // Create a pre-tenured empty AccessorPair.
  59   Handle<AccessorPair> NewAccessorPair();
  60
  61   // Create an empty TypeFeedbackInfo.
  62   Handle<TypeFeedbackInfo> NewTypeFeedbackInfo();
  63
  64   // Finds the internalized copy for string in the string table.
  65   // If not found, a new string is added to the table and returned.
  66   Handle<String> InternalizeUtf8String(Vector<const char> str);
  67   Handle<String> InternalizeUtf8String(const char* str) {
  68     return InternalizeUtf8String(CStrVector(str));
  69   }
  70   Handle<String> InternalizeString(Handle<String> str);
  71   Handle<String> InternalizeOneByteString(Vector<const uint8_t> str);
  72   Handle<String> InternalizeOneByteString(
  73       Handle<SeqOneByteString>, int from, int length);
  74
  75   Handle<String> InternalizeTwoByteString(Vector<const uc16> str);
  76
  77   template<class StringTableKey>
  78   Handle<String> InternalizeStringWithKey(StringTableKey* key);
  79
  80
  81   // String creation functions.  Most of the string creation functions take
  82   // a Heap::PretenureFlag argument to optionally request that they be
  83   // allocated in the old generation.  The pretenure flag defaults to
  84   // DONT_TENURE.
  85   //
  86   // Creates a new String object.  There are two String encodings: one-byte and
  87   // two-byte.  One should choose between the three string factory functions
  88   // based on the encoding of the string buffer that the string is
  89   // initialized from.
  90   //   - ...FromOneByte initializes the string from a buffer that is Latin1
  91   //     encoded (it does not check that the buffer is Latin1 encoded) and
  92   //     the result will be Latin1 encoded.
  93   //   - ...FromUtf8 initializes the string from a buffer that is UTF-8
  94   //     encoded.  If the characters are all ASCII characters, the result
  95   //     will be Latin1 encoded, otherwise it will converted to two-byte.
  96   //   - ...FromTwoByte initializes the string from a buffer that is two-byte
  97   //     encoded.  If the characters are all Latin1 characters, the result
  98   //     will be converted to Latin1, otherwise it will be left as two-byte.
  99   //
 100   // One-byte strings are pretenured when used as keys in the SourceCodeCache.
 101   MUST_USE_RESULT MaybeHandle<String> NewStringFromOneByte(
 102       Vector<const uint8_t> str,
 103       PretenureFlag pretenure = NOT_TENURED);
 104
 105   template <size_t N>
 106   inline Handle<String> NewStringFromStaticChars(
 107       const char (&str)[N], PretenureFlag pretenure = NOT_TENURED) {
 108     DCHECK(N == StrLength(str) + 1);
 109     return NewStringFromOneByte(STATIC_CHAR_VECTOR(str), pretenure)
 110         .ToHandleChecked();
 111   }
 112
 113   inline Handle<String> NewStringFromAsciiChecked(
 114       const char* str,
 115       PretenureFlag pretenure = NOT_TENURED) {
 116     return NewStringFromOneByte(
 117         OneByteVector(str), pretenure).ToHandleChecked();
 118   }
 119
 120
 121   // Allocates and fully initializes a String.  There are two String encodings:
 122   // one-byte and two-byte. One should choose between the threestring
 123   // allocation functions based on the encoding of the string buffer used to
 124   // initialized the string.
 125   //   - ...FromOneByte initializes the string from a buffer that is Latin1
 126   //     encoded (it does not check that the buffer is Latin1 encoded) and the
 127   //     result will be Latin1 encoded.
 128   //   - ...FromUTF8 initializes the string from a buffer that is UTF-8
 129   //     encoded.  If the characters are all ASCII characters, the result
 130   //     will be Latin1 encoded, otherwise it will converted to two-byte.
 131   //   - ...FromTwoByte initializes the string from a buffer that is two-byte
 132   //     encoded.  If the characters are all Latin1 characters, the
 133   //     result will be converted to Latin1, otherwise it will be left as
 134   //     two-byte.
 135
 136   // TODO(dcarney): remove this function.
 137   MUST_USE_RESULT inline MaybeHandle<String> NewStringFromAscii(
 138       Vector<const char> str,
 139       PretenureFlag pretenure = NOT_TENURED) {
 140     return NewStringFromOneByte(Vector<const uint8_t>::cast(str), pretenure);
 141   }
 142
 143   // UTF8 strings are pretenured when used for regexp literal patterns and
 144   // flags in the parser.
 145   MUST_USE_RESULT MaybeHandle<String> NewStringFromUtf8(
 146       Vector<const char> str,
 147       PretenureFlag pretenure = NOT_TENURED);
 148
 149   MUST_USE_RESULT MaybeHandle<String> NewStringFromTwoByte(
 150       Vector<const uc16> str,
 151       PretenureFlag pretenure = NOT_TENURED);
 152
 153   // Allocates an internalized string in old space based on the character
 154   // stream.
 155   MUST_USE_RESULT Handle<String> NewInternalizedStringFromUtf8(
 156       Vector<const char> str,
 157       int chars,
 158       uint32_t hash_field);
 159
 160   MUST_USE_RESULT Handle<String> NewOneByteInternalizedString(
 161       Vector<const uint8_t> str, uint32_t hash_field);
 162
 163   MUST_USE_RESULT Handle<String> NewOneByteInternalizedSubString(
 164       Handle<SeqOneByteString> string, int offset, int length,
 165       uint32_t hash_field);
 166
 167   MUST_USE_RESULT Handle<String> NewTwoByteInternalizedString(
 168         Vector<const uc16> str,
 169         uint32_t hash_field);
 170
 171   MUST_USE_RESULT Handle<String> NewInternalizedStringImpl(
 172       Handle<String> string, int chars, uint32_t hash_field);
 173
 174   // Compute the matching internalized string map for a string if possible.
 175   // Empty handle is returned if string is in new space or not flattened.
 176   MUST_USE_RESULT MaybeHandle<Map> InternalizedStringMapForString(
 177       Handle<String> string);
 178
 179   // Allocates and partially initializes an one-byte or two-byte String. The
 180   // characters of the string are uninitialized. Currently used in regexp code
 181   // only, where they are pretenured.
 182   MUST_USE_RESULT MaybeHandle<SeqOneByteString> NewRawOneByteString(
 183       int length,
 184       PretenureFlag pretenure = NOT_TENURED);
 185   MUST_USE_RESULT MaybeHandle<SeqTwoByteString> NewRawTwoByteString(
 186       int length,
 187       PretenureFlag pretenure = NOT_TENURED);
 188
 189   // Creates a single character string where the character has given code.
 190   // A cache is used for Latin1 codes.
 191   Handle<String> LookupSingleCharacterStringFromCode(uint32_t code);
 192
 193   // Create a new cons string object which consists of a pair of strings.
 194   MUST_USE_RESULT MaybeHandle<String> NewConsString(Handle<String> left,
 195                                                     Handle<String> right);
 196   MUST_USE_RESULT MaybeHandle<String> NewOneByteConsString(
 197       int length, Handle<String> left, Handle<String> right);
 198   MUST_USE_RESULT MaybeHandle<String> NewTwoByteConsString(
 199       int length, Handle<String> left, Handle<String> right);
 200   MUST_USE_RESULT MaybeHandle<String> NewRawConsString(Handle<Map> map,
 201                                                        int length,
 202                                                        Handle<String> left,
 203                                                        Handle<String> right);
 204
 205   // Create a new string object which holds a proper substring of a string.
 206   Handle<String> NewProperSubString(Handle<String> str,
 207                                     int begin,
 208                                     int end);
 209
 210   // Create a new string object which holds a substring of a string.
 211   Handle<String> NewSubString(Handle<String> str, int begin, int end) {
 212     if (begin == 0 && end == str->length()) return str;
 213     return NewProperSubString(str, begin, end);
 214   }
 215
 216   // Creates a new external String object.  There are two String encodings
 217   // in the system: one-byte and two-byte.  Unlike other String types, it does
 218   // not make sense to have a UTF-8 factory function for external strings,
 219   // because we cannot change the underlying buffer.  Note that these strings
 220   // are backed by a string resource that resides outside the V8 heap.
 221   MUST_USE_RESULT MaybeHandle<String> NewExternalStringFromOneByte(
 222       const ExternalOneByteString::Resource* resource);
 223   MUST_USE_RESULT MaybeHandle<String> NewExternalStringFromTwoByte(
 224       const ExternalTwoByteString::Resource* resource);
 225
 226   // Create a symbol.
 227   Handle<Symbol> NewSymbol();
 228   Handle<Symbol> NewPrivateSymbol(Handle<Object> name);
 229
 230   // Create a global (but otherwise uninitialized) context.
 231   Handle<Context> NewNativeContext();
 232
 233   // Create a script context.
 234   Handle<Context> NewScriptContext(Handle<JSFunction> function,
 235                                    Handle<ScopeInfo> scope_info);
 236
 237   // Create an empty script context table.
 238   Handle<ScriptContextTable> NewScriptContextTable();
 239
 240   // Create a module context.
 241   Handle<Context> NewModuleContext(Handle<ScopeInfo> scope_info);
 242
 243   // Create a function context.
 244   Handle<Context> NewFunctionContext(int length, Handle<JSFunction> function);
 245
 246   // Create a catch context.
 247   Handle<Context> NewCatchContext(Handle<JSFunction> function,
 248                                   Handle<Context> previous,
 249                                   Handle<String> name,
 250                                   Handle<Object> thrown_object);
 251
 252   // Create a 'with' context.
 253   Handle<Context> NewWithContext(Handle<JSFunction> function,
 254                                  Handle<Context> previous,
 255                                  Handle<JSReceiver> extension);
 256
 257   // Create a block context.
 258   Handle<Context> NewBlockContext(Handle<JSFunction> function,
 259                                   Handle<Context> previous,
 260                                   Handle<ScopeInfo> scope_info);
 261
 262   // Allocate a new struct.  The struct is pretenured (allocated directly in
 263   // the old generation).
 264   Handle<Struct> NewStruct(InstanceType type);
 265
 266   Handle<CodeCache> NewCodeCache();
 267
 268   Handle<AliasedArgumentsEntry> NewAliasedArgumentsEntry(
 269       int aliased_context_slot);
 270
 271   Handle<ExecutableAccessorInfo> NewExecutableAccessorInfo();
 272
 273   Handle<Script> NewScript(Handle<String> source);
 274
 275   // Foreign objects are pretenured when allocated by the bootstrapper.
 276   Handle<Foreign> NewForeign(Address addr,
 277                              PretenureFlag pretenure = NOT_TENURED);
 278
 279   // Allocate a new foreign object.  The foreign is pretenured (allocated
 280   // directly in the old generation).
 281   Handle<Foreign> NewForeign(const AccessorDescriptor* foreign);
 282
 283   Handle<ByteArray> NewByteArray(int length,
 284                                  PretenureFlag pretenure = NOT_TENURED);
 285
 286   Handle<BytecodeArray> NewBytecodeArray(int length, const byte* raw_bytecodes,
 287                                          int frame_size);
 288
 289   Handle<ExternalArray> NewExternalArray(
 290       int length,
 291       ExternalArrayType array_type,
 292       void* external_pointer,
 293       PretenureFlag pretenure = NOT_TENURED);
 294
 295   Handle<FixedTypedArrayBase> NewFixedTypedArray(
 296       int length, ExternalArrayType array_type, bool initialize,
 297       PretenureFlag pretenure = NOT_TENURED);
 298
 299   Handle<Cell> NewCell(Handle<Object> value);
 300
 301   Handle<PropertyCell> NewPropertyCell();
 302
 303   Handle<WeakCell> NewWeakCell(Handle<HeapObject> value);
 304
 305   // Allocate a tenured AllocationSite. It's payload is null.
 306   Handle<AllocationSite> NewAllocationSite();
 307
 308   Handle<Map> NewMap(
 309       InstanceType type,
 310       int instance_size,
 311       ElementsKind elements_kind = TERMINAL_FAST_ELEMENTS_KIND);
 312
 313   Handle<HeapObject> NewFillerObject(int size,
 314                                      bool double_align,
 315                                      AllocationSpace space);
 316
 317   Handle<JSObject> NewFunctionPrototype(Handle<JSFunction> function);
 318
 319   Handle<JSObject> CopyJSObject(Handle<JSObject> object);
 320
 321   Handle<JSObject> CopyJSObjectWithAllocationSite(Handle<JSObject> object,
 322                                                   Handle<AllocationSite> site);
 323
 324   Handle<FixedArray> CopyFixedArrayWithMap(Handle<FixedArray> array,
 325                                            Handle<Map> map);
 326
 327   Handle<FixedArray> CopyFixedArray(Handle<FixedArray> array);
 328
 329   // This method expects a COW array in new space, and creates a copy
 330   // of it in old space.
 331   Handle<FixedArray> CopyAndTenureFixedCOWArray(Handle<FixedArray> array);
 332
 333   Handle<FixedDoubleArray> CopyFixedDoubleArray(
 334       Handle<FixedDoubleArray> array);
 335
 336   // Numbers (e.g. literals) are pretenured by the parser.
 337   // The return value may be a smi or a heap number.
 338   Handle<Object> NewNumber(double value,
 339                            PretenureFlag pretenure = NOT_TENURED);
 340
 341   Handle<Object> NewNumberFromInt(int32_t value,
 342                                   PretenureFlag pretenure = NOT_TENURED);
 343   Handle<Object> NewNumberFromUint(uint32_t value,
 344                                   PretenureFlag pretenure = NOT_TENURED);
 345   Handle<Object> NewNumberFromSize(size_t value,
 346                                    PretenureFlag pretenure = NOT_TENURED) {
 347     if (Smi::IsValid(static_cast<intptr_t>(value))) {
 348       return Handle<Object>(Smi::FromIntptr(static_cast<intptr_t>(value)),
 349                             isolate());
 350     }
 351     return NewNumber(static_cast<double>(value), pretenure);
 352   }
 353   Handle<HeapNumber> NewHeapNumber(double value,
 354                                    MutableMode mode = IMMUTABLE,
 355                                    PretenureFlag pretenure = NOT_TENURED);
 356   Handle<Float32x4> NewFloat32x4(float w, float x, float y, float z,
 357                                  PretenureFlag pretenure = NOT_TENURED);
 358
 359   // These objects are used by the api to create env-independent data
 360   // structures in the heap.
 361   inline Handle<JSObject> NewNeanderObject() {
 362     return NewJSObjectFromMap(neander_map());
 363   }
 364
 365   Handle<JSWeakMap> NewJSWeakMap();
 366
 367   Handle<JSObject> NewArgumentsObject(Handle<JSFunction> callee, int length);
 368
 369   // JS objects are pretenured when allocated by the bootstrapper and
 370   // runtime.
 371   Handle<JSObject> NewJSObject(Handle<JSFunction> constructor,
 372                                PretenureFlag pretenure = NOT_TENURED);
 373   // JSObject that should have a memento pointing to the allocation site.
 374   Handle<JSObject> NewJSObjectWithMemento(Handle<JSFunction> constructor,
 375                                           Handle<AllocationSite> site);
 376
 377   // Global objects are pretenured and initialized based on a constructor.
 378   Handle<GlobalObject> NewGlobalObject(Handle<JSFunction> constructor);
 379
 380   // JS objects are pretenured when allocated by the bootstrapper and
 381   // runtime.
 382   Handle<JSObject> NewJSObjectFromMap(
 383       Handle<Map> map,
 384       PretenureFlag pretenure = NOT_TENURED,
 385       Handle<AllocationSite> allocation_site = Handle<AllocationSite>::null());
 386
 387   // JS modules are pretenured.
 388   Handle<JSModule> NewJSModule(Handle<Context> context,
 389                                Handle<ScopeInfo> scope_info);
 390
 391   // JS arrays are pretenured when allocated by the parser.
 392
 393   // Create a JSArray with no elements.
 394   Handle<JSArray> NewJSArray(ElementsKind elements_kind,
 395                              Strength strength = Strength::WEAK,
 396                              PretenureFlag pretenure = NOT_TENURED);
 397
 398   // Create a JSArray with a specified length and elements initialized
 399   // according to the specified mode.
 400   Handle<JSArray> NewJSArray(
 401       ElementsKind elements_kind, int length, int capacity,
 402       Strength strength = Strength::WEAK,
 403       ArrayStorageAllocationMode mode = DONT_INITIALIZE_ARRAY_ELEMENTS,
 404       PretenureFlag pretenure = NOT_TENURED);
 405
 406   Handle<JSArray> NewJSArray(
 407       int capacity, ElementsKind elements_kind = TERMINAL_FAST_ELEMENTS_KIND,
 408       Strength strength = Strength::WEAK,
 409       PretenureFlag pretenure = NOT_TENURED) {
 410     if (capacity != 0) {
 411       elements_kind = GetHoleyElementsKind(elements_kind);
 412     }
 413     return NewJSArray(elements_kind, 0, capacity, strength,
 414                       INITIALIZE_ARRAY_ELEMENTS_WITH_HOLE, pretenure);
 415   }
 416
 417   // Create a JSArray with the given elements.
 418   Handle<JSArray> NewJSArrayWithElements(Handle<FixedArrayBase> elements,
 419                                          ElementsKind elements_kind, int length,
 420                                          Strength strength = Strength::WEAK,
 421                                          PretenureFlag pretenure = NOT_TENURED);
 422
 423   Handle<JSArray> NewJSArrayWithElements(
 424       Handle<FixedArrayBase> elements,
 425       ElementsKind elements_kind = TERMINAL_FAST_ELEMENTS_KIND,
 426       Strength strength = Strength::WEAK,
 427       PretenureFlag pretenure = NOT_TENURED) {
 428     return NewJSArrayWithElements(elements, elements_kind, elements->length(),
 429                                   strength, pretenure);
 430   }
 431
 432   void NewJSArrayStorage(
 433       Handle<JSArray> array,
 434       int length,
 435       int capacity,
 436       ArrayStorageAllocationMode mode = DONT_INITIALIZE_ARRAY_ELEMENTS);
 437
 438   Handle<JSGeneratorObject> NewJSGeneratorObject(Handle<JSFunction> function);
 439
 440   Handle<JSArrayBuffer> NewJSArrayBuffer(
 441       SharedFlag shared = SharedFlag::kNotShared);
 442
 443   Handle<JSTypedArray> NewJSTypedArray(ExternalArrayType type);
 444
 445   Handle<JSTypedArray> NewJSTypedArray(ElementsKind elements_kind);
 446
 447   // Creates a new JSTypedArray with the specified buffer.
 448   Handle<JSTypedArray> NewJSTypedArray(ExternalArrayType type,
 449                                        Handle<JSArrayBuffer> buffer,
 450                                        size_t byte_offset, size_t length);
 451
 452   // Creates a new on-heap JSTypedArray.
 453   Handle<JSTypedArray> NewJSTypedArray(ElementsKind elements_kind,
 454                                        size_t number_of_elements);
 455
 456   Handle<JSDataView> NewJSDataView();
 457   Handle<JSDataView> NewJSDataView(Handle<JSArrayBuffer> buffer,
 458                                    size_t byte_offset, size_t byte_length);
 459
 460   Handle<JSMap> NewJSMap();
 461   Handle<JSSet> NewJSSet();
 462
 463   // TODO(aandrey): Maybe these should take table, index and kind arguments.
 464   Handle<JSMapIterator> NewJSMapIterator();
 465   Handle<JSSetIterator> NewJSSetIterator();
 466
 467   // Allocates a Harmony proxy.
 468   Handle<JSProxy> NewJSProxy(Handle<Object> handler, Handle<Object> prototype);
 469
 470   // Allocates a Harmony function proxy.
 471   Handle<JSProxy> NewJSFunctionProxy(Handle<Object> handler,
 472                                      Handle<Object> call_trap,
 473                                      Handle<Object> construct_trap,
 474                                      Handle<Object> prototype);
 475
 476   // Reinitialize an JSGlobalProxy based on a constructor.  The object
 477   // must have the same size as objects allocated using the
 478   // constructor.  The object is reinitialized and behaves as an
 479   // object that has been freshly allocated using the constructor.
 480   void ReinitializeJSGlobalProxy(Handle<JSGlobalProxy> global,
 481                                  Handle<JSFunction> constructor);
 482
 483   Handle<JSGlobalProxy> NewUninitializedJSGlobalProxy();
 484
 485   // Change the type of the argument into a JS object/function and reinitialize.
 486   void BecomeJSObject(Handle<JSProxy> object);
 487   void BecomeJSFunction(Handle<JSProxy> object);
 488
 489   Handle<JSFunction> NewFunction(Handle<String> name, Handle<Code> code,
 490                                  Handle<Object> prototype,
 491                                  bool read_only_prototype = false,
 492                                  bool is_strict = false);
 493   Handle<JSFunction> NewFunction(Handle<String> name);
 494   Handle<JSFunction> NewFunctionWithoutPrototype(Handle<String> name,
 495                                                  Handle<Code> code,
 496                                                  bool is_strict = false);
 497
 498   Handle<JSFunction> NewFunctionFromSharedFunctionInfo(
 499       Handle<SharedFunctionInfo> function_info,
 500       Handle<Context> context,
 501       PretenureFlag pretenure = TENURED);
 502
 503   Handle<JSFunction> NewFunction(Handle<String> name, Handle<Code> code,
 504                                  Handle<Object> prototype, InstanceType type,
 505                                  int instance_size,
 506                                  bool read_only_prototype = false,
 507                                  bool install_constructor = false,
 508                                  bool is_strict = false);
 509   Handle<JSFunction> NewFunction(Handle<String> name,
 510                                  Handle<Code> code,
 511                                  InstanceType type,
 512                                  int instance_size);
 513
 514   // Create a serialized scope info.
 515   Handle<ScopeInfo> NewScopeInfo(int length);
 516
 517   // Create an External object for V8's external API.
 518   Handle<JSObject> NewExternal(void* value);
 519
 520   // The reference to the Code object is stored in self_reference.
 521   // This allows generated code to reference its own Code object
 522   // by containing this handle.
 523   Handle<Code> NewCode(const CodeDesc& desc,
 524                        Code::Flags flags,
 525                        Handle<Object> self_reference,
 526                        bool immovable = false,
 527                        bool crankshafted = false,
 528                        int prologue_offset = Code::kPrologueOffsetNotSet,
 529                        bool is_debug = false);
 530
 531   Handle<Code> CopyCode(Handle<Code> code);
 532
 533   Handle<Code> CopyCode(Handle<Code> code, Vector<byte> reloc_info);
 534
 535   // Interface for creating error objects.
 536
 537   Handle<Object> NewError(const char* maker, const char* message,
 538                           Handle<JSArray> args);
 539   Handle<String> EmergencyNewError(const char* message, Handle<JSArray> args);
 540
 541   Handle<Object> NewError(const char* constructor, Handle<String> message);
 542
 543   Handle<Object> NewInvalidStringLengthError() {
 544     return NewRangeError(MessageTemplate::kInvalidStringLength);
 545   }
 546
 547   Handle<Object> NewError(const char* maker,
 548                           MessageTemplate::Template template_index,
 549                           Handle<Object> arg0 = Handle<Object>(),
 550                           Handle<Object> arg1 = Handle<Object>(),
 551                           Handle<Object> arg2 = Handle<Object>());
 552
 553   Handle<Object> NewError(MessageTemplate::Template template_index,
 554                           Handle<Object> arg0 = Handle<Object>(),
 555                           Handle<Object> arg1 = Handle<Object>(),
 556                           Handle<Object> arg2 = Handle<Object>());
 557
 558   Handle<Object> NewTypeError(MessageTemplate::Template template_index,
 559                               Handle<Object> arg0 = Handle<Object>(),
 560                               Handle<Object> arg1 = Handle<Object>(),
 561                               Handle<Object> arg2 = Handle<Object>());
 562
 563   Handle<Object> NewSyntaxError(MessageTemplate::Template template_index,
 564                                 Handle<Object> arg0 = Handle<Object>(),
 565                                 Handle<Object> arg1 = Handle<Object>(),
 566                                 Handle<Object> arg2 = Handle<Object>());
 567
 568   Handle<Object> NewReferenceError(MessageTemplate::Template template_index,
 569                                    Handle<Object> arg0 = Handle<Object>(),
 570                                    Handle<Object> arg1 = Handle<Object>(),
 571                                    Handle<Object> arg2 = Handle<Object>());
 572
 573   Handle<Object> NewRangeError(MessageTemplate::Template template_index,
 574                                Handle<Object> arg0 = Handle<Object>(),
 575                                Handle<Object> arg1 = Handle<Object>(),
 576                                Handle<Object> arg2 = Handle<Object>());
 577
 578   Handle<Object> NewEvalError(MessageTemplate::Template template_index,
 579                               Handle<Object> arg0 = Handle<Object>(),
 580                               Handle<Object> arg1 = Handle<Object>(),
 581                               Handle<Object> arg2 = Handle<Object>());
 582
 583   Handle<String> NumberToString(Handle<Object> number,
 584                                 bool check_number_string_cache = true);
 585
 586   Handle<String> Uint32ToString(uint32_t value) {
 587     return NumberToString(NewNumberFromUint(value));
 588   }
 589
 590   Handle<JSFunction> InstallMembers(Handle<JSFunction> function);
 591
 592 #define ROOT_ACCESSOR(type, name, camel_name)                         \
 593   inline Handle<type> name() {                                        \
 594     return Handle<type>(bit_cast<type**>(                             \
 595         &isolate()->heap()->roots_[Heap::k##camel_name##RootIndex])); \
 596   }
 597   ROOT_LIST(ROOT_ACCESSOR)
 598 #undef ROOT_ACCESSOR
 599
 600 #define STRUCT_MAP_ACCESSOR(NAME, Name, name)                      \
 601   inline Handle<Map> name##_map() {                                \
 602     return Handle<Map>(bit_cast<Map**>(                            \
 603         &isolate()->heap()->roots_[Heap::k##Name##MapRootIndex])); \
 604   }
 605   STRUCT_LIST(STRUCT_MAP_ACCESSOR)
 606 #undef STRUCT_MAP_ACCESSOR
 607
 608 #define STRING_ACCESSOR(name, str)                              \
 609   inline Handle<String> name() {                                \
 610     return Handle<String>(bit_cast<String**>(                   \
 611         &isolate()->heap()->roots_[Heap::k##name##RootIndex])); \
 612   }
 613   INTERNALIZED_STRING_LIST(STRING_ACCESSOR)
 614 #undef STRING_ACCESSOR
 615
 616 #define SYMBOL_ACCESSOR(name)                                   \
 617   inline Handle<Symbol> name() {                                \
 618     return Handle<Symbol>(bit_cast<Symbol**>(                   \
 619         &isolate()->heap()->roots_[Heap::k##name##RootIndex])); \
 620   }
 621   PRIVATE_SYMBOL_LIST(SYMBOL_ACCESSOR)
 622 #undef SYMBOL_ACCESSOR
 623
 624 #define SYMBOL_ACCESSOR(name, varname, description)             \
 625   inline Handle<Symbol> name() {                                \
 626     return Handle<Symbol>(bit_cast<Symbol**>(                   \
 627         &isolate()->heap()->roots_[Heap::k##name##RootIndex])); \
 628   }
 629   PUBLIC_SYMBOL_LIST(SYMBOL_ACCESSOR)
 630 #undef SYMBOL_ACCESSOR
 631
 632   inline void set_string_table(Handle<StringTable> table) {
 633     isolate()->heap()->set_string_table(*table);
 634   }
 635
 636   inline void set_weak_stack_trace_list(Handle<WeakFixedArray> list) {
 637     isolate()->heap()->set_weak_stack_trace_list(*list);
 638   }
 639
 640   Handle<String> hidden_string() {
 641     return Handle<String>(&isolate()->heap()->hidden_string_);
 642   }
 643
 644   // Allocates a new SharedFunctionInfo object.
 645   Handle<SharedFunctionInfo> NewSharedFunctionInfo(
 646       Handle<String> name, int number_of_literals, FunctionKind kind,
 647       Handle<Code> code, Handle<ScopeInfo> scope_info,
 648       Handle<TypeFeedbackVector> feedback_vector);
 649   Handle<SharedFunctionInfo> NewSharedFunctionInfo(Handle<String> name,
 650                                                    MaybeHandle<Code> code);
 651
 652   // Allocate a new type feedback vector
 653   template <typename Spec>
 654   Handle<TypeFeedbackVector> NewTypeFeedbackVector(const Spec* spec);
 655
 656   // Allocates a new JSMessageObject object.
 657   Handle<JSMessageObject> NewJSMessageObject(MessageTemplate::Template message,
 658                                              Handle<Object> argument,
 659                                              int start_position,
 660                                              int end_position,
 661                                              Handle<Object> script,
 662                                              Handle<Object> stack_frames);
 663
 664   Handle<DebugInfo> NewDebugInfo(Handle<SharedFunctionInfo> shared);
 665
 666   // Return a map for given number of properties using the map cache in the
 667   // native context.
 668   Handle<Map> ObjectLiteralMapFromCache(Handle<Context> context,
 669                                         int number_of_properties,
 670                                         bool is_strong,
 671                                         bool* is_result_from_cache);
 672
 673   // Creates a new FixedArray that holds the data associated with the
 674   // atom regexp and stores it in the regexp.
 675   void SetRegExpAtomData(Handle<JSRegExp> regexp,
 676                          JSRegExp::Type type,
 677                          Handle<String> source,
 678                          JSRegExp::Flags flags,
 679                          Handle<Object> match_pattern);
 680
 681   // Creates a new FixedArray that holds the data associated with the
 682   // irregexp regexp and stores it in the regexp.
 683   void SetRegExpIrregexpData(Handle<JSRegExp> regexp,
 684                              JSRegExp::Type type,
 685                              Handle<String> source,
 686                              JSRegExp::Flags flags,
 687                              int capture_count);
 688
 689   // Returns the value for a known global constant (a property of the global
 690   // object which is neither configurable nor writable) like 'undefined'.
 691   // Returns a null handle when the given name is unknown.
 692   Handle<Object> GlobalConstantFor(Handle<Name> name);
 693
 694   // Converts the given boolean condition to JavaScript boolean value.
 695   Handle<Object> ToBoolean(bool value);
 696
 697  private:
 698   Isolate* isolate() { return reinterpret_cast<Isolate*>(this); }
 699
 700   // Creates a heap object based on the map. The fields of the heap object are
 701   // not initialized by New<>() functions. It's the responsibility of the caller
 702   // to do that.
 703   template<typename T>
 704   Handle<T> New(Handle<Map> map, AllocationSpace space);
 705
 706   template<typename T>
 707   Handle<T> New(Handle<Map> map,
 708                 AllocationSpace space,
 709                 Handle<AllocationSite> allocation_site);
 710
 711   // Creates a code object that is not yet fully initialized yet.
 712   inline Handle<Code> NewCodeRaw(int object_size, bool immovable);
 713
 714   // Attempt to find the number in a small cache.  If we finds it, return
 715   // the string representation of the number.  Otherwise return undefined.
 716   Handle<Object> GetNumberStringCache(Handle<Object> number);
 717
 718   // Update the cache with a new number-string pair.
 719   void SetNumberStringCache(Handle<Object> number, Handle<String> string);
 720
 721   // Initializes a function with a shared part and prototype.
 722   // Note: this code was factored out of NewFunction such that other parts of
 723   // the VM could use it. Specifically, a function that creates instances of
 724   // type JS_FUNCTION_TYPE benefit from the use of this function.
 725   inline void InitializeFunction(Handle<JSFunction> function,
 726                                  Handle<SharedFunctionInfo> info,
 727                                  Handle<Context> context);
 728
 729   // Creates a function initialized with a shared part.
 730   Handle<JSFunction> NewFunction(Handle<Map> map,
 731                                  Handle<SharedFunctionInfo> info,
 732                                  Handle<Context> context,
 733                                  PretenureFlag pretenure = TENURED);
 734
 735   Handle<JSFunction> NewFunction(Handle<Map> map,
 736                                  Handle<String> name,
 737                                  MaybeHandle<Code> maybe_code);
 738
 739   // Reinitialize a JSProxy into an (empty) JS object of respective type and
 740   // size, but keeping the original prototype.  The receiver must have at least
 741   // the size of the new object.  The object is reinitialized and behaves as an
 742   // object that has been freshly allocated.
 743   void ReinitializeJSProxy(Handle<JSProxy> proxy, InstanceType type, int size);
 744 };
 745
 746 } }  // namespace v8::internal
 747
 748 #endif  // V8_FACTORY_H_