src/api.h

   1 // Copyright 2012 the V8 project authors. All rights reserved.
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  27
  28 #ifndef V8_API_H_
  29 #define V8_API_H_
  30
  31 #include "v8.h"
  32
  33 #include "../include/v8-testing.h"
  34 #include "apiutils.h"
  35 #include "contexts.h"
  36 #include "factory.h"
  37 #include "isolate.h"
  38 #include "list-inl.h"
  39
  40 namespace v8 {
  41
  42 // Constants used in the implementation of the API.  The most natural thing
  43 // would usually be to place these with the classes that use them, but
  44 // we want to keep them out of v8.h because it is an externally
  45 // visible file.
  46 class Consts {
  47  public:
  48   enum TemplateType {
  49     FUNCTION_TEMPLATE = 0,
  50     OBJECT_TEMPLATE = 1
  51   };
  52 };
  53
  54
  55 // Utilities for working with neander-objects, primitive
  56 // env-independent JSObjects used by the api.
  57 class NeanderObject {
  58  public:
  59   explicit NeanderObject(int size);
  60   explicit inline NeanderObject(v8::internal::Handle<v8::internal::Object> obj);
  61   explicit inline NeanderObject(v8::internal::Object* obj);
  62   inline v8::internal::Object* get(int index);
  63   inline void set(int index, v8::internal::Object* value);
  64   inline v8::internal::Handle<v8::internal::JSObject> value() { return value_; }
  65   int size();
  66  private:
  67   v8::internal::Handle<v8::internal::JSObject> value_;
  68 };
  69
  70
  71 // Utilities for working with neander-arrays, a simple extensible
  72 // array abstraction built on neander-objects.
  73 class NeanderArray {
  74  public:
  75   NeanderArray();
  76   explicit inline NeanderArray(v8::internal::Handle<v8::internal::Object> obj);
  77   inline v8::internal::Handle<v8::internal::JSObject> value() {
  78     return obj_.value();
  79   }
  80
  81   void add(v8::internal::Handle<v8::internal::Object> value);
  82
  83   int length();
  84
  85   v8::internal::Object* get(int index);
  86   // Change the value at an index to undefined value. If the index is
  87   // out of bounds, the request is ignored. Returns the old value.
  88   void set(int index, v8::internal::Object* value);
  89  private:
  90   NeanderObject obj_;
  91 };
  92
  93
  94 NeanderObject::NeanderObject(v8::internal::Handle<v8::internal::Object> obj)
  95     : value_(v8::internal::Handle<v8::internal::JSObject>::cast(obj)) { }
  96
  97
  98 NeanderObject::NeanderObject(v8::internal::Object* obj)
  99     : value_(v8::internal::Handle<v8::internal::JSObject>(
 100         v8::internal::JSObject::cast(obj))) { }
 101
 102
 103 NeanderArray::NeanderArray(v8::internal::Handle<v8::internal::Object> obj)
 104     : obj_(obj) { }
 105
 106
 107 v8::internal::Object* NeanderObject::get(int offset) {
 108   ASSERT(value()->HasFastObjectElements());
 109   return v8::internal::FixedArray::cast(value()->elements())->get(offset);
 110 }
 111
 112
 113 void NeanderObject::set(int offset, v8::internal::Object* value) {
 114   ASSERT(value_->HasFastObjectElements());
 115   v8::internal::FixedArray::cast(value_->elements())->set(offset, value);
 116 }
 117
 118
 119 template <typename T> inline T ToCData(v8::internal::Object* obj) {
 120   STATIC_ASSERT(sizeof(T) == sizeof(v8::internal::Address));
 121   return reinterpret_cast<T>(
 122       reinterpret_cast<intptr_t>(
 123           v8::internal::Foreign::cast(obj)->foreign_address()));
 124 }
 125
 126
 127 template <typename T>
 128 inline v8::internal::Handle<v8::internal::Object> FromCData(T obj) {
 129   STATIC_ASSERT(sizeof(T) == sizeof(v8::internal::Address));
 130   return FACTORY->NewForeign(
 131       reinterpret_cast<v8::internal::Address>(reinterpret_cast<intptr_t>(obj)));
 132 }
 133
 134
 135 class ApiFunction {
 136  public:
 137   explicit ApiFunction(v8::internal::Address addr) : addr_(addr) { }
 138   v8::internal::Address address() { return addr_; }
 139  private:
 140   v8::internal::Address addr_;
 141 };
 142
 143
 144
 145 class RegisteredExtension {
 146  public:
 147   explicit RegisteredExtension(Extension* extension);
 148   static void Register(RegisteredExtension* that);
 149   static void UnregisterAll();
 150   Extension* extension() { return extension_; }
 151   RegisteredExtension* next() { return next_; }
 152   RegisteredExtension* next_auto() { return next_auto_; }
 153   static RegisteredExtension* first_extension() { return first_extension_; }
 154  private:
 155   Extension* extension_;
 156   RegisteredExtension* next_;
 157   RegisteredExtension* next_auto_;
 158   static RegisteredExtension* first_extension_;
 159 };
 160
 161
 162 #define OPEN_HANDLE_LIST(V)                    \
 163   V(Template, TemplateInfo)                    \
 164   V(FunctionTemplate, FunctionTemplateInfo)    \
 165   V(ObjectTemplate, ObjectTemplateInfo)        \
 166   V(Signature, SignatureInfo)                  \
 167   V(AccessorSignature, FunctionTemplateInfo)   \
 168   V(TypeSwitch, TypeSwitchInfo)                \
 169   V(Data, Object)                              \
 170   V(RegExp, JSRegExp)                          \
 171   V(Object, JSObject)                          \
 172   V(Array, JSArray)                            \
 173   V(String, String)                            \
 174   V(Symbol, Symbol)                            \
 175   V(Script, Object)                            \
 176   V(Function, JSFunction)                      \
 177   V(Message, JSObject)                         \
 178   V(Context, Context)                          \
 179   V(External, Foreign)                         \
 180   V(StackTrace, JSArray)                       \
 181   V(StackFrame, JSObject)                      \
 182   V(DeclaredAccessorDescriptor, DeclaredAccessorDescriptor)
 183
 184
 185 class Utils {
 186  public:
 187   static bool ReportApiFailure(const char* location, const char* message);
 188
 189   static Local<FunctionTemplate> ToFunctionTemplate(NeanderObject obj);
 190   static Local<ObjectTemplate> ToObjectTemplate(NeanderObject obj);
 191
 192   static inline Local<Context> ToLocal(
 193       v8::internal::Handle<v8::internal::Context> obj);
 194   static inline Local<Value> ToLocal(
 195       v8::internal::Handle<v8::internal::Object> obj);
 196   static inline Local<Function> ToLocal(
 197       v8::internal::Handle<v8::internal::JSFunction> obj);
 198   static inline Local<String> ToLocal(
 199       v8::internal::Handle<v8::internal::String> obj);
 200   static inline Local<Symbol> ToLocal(
 201       v8::internal::Handle<v8::internal::Symbol> obj);
 202   static inline Local<RegExp> ToLocal(
 203       v8::internal::Handle<v8::internal::JSRegExp> obj);
 204   static inline Local<Object> ToLocal(
 205       v8::internal::Handle<v8::internal::JSObject> obj);
 206   static inline Local<Array> ToLocal(
 207       v8::internal::Handle<v8::internal::JSArray> obj);
 208   static inline Local<Message> MessageToLocal(
 209       v8::internal::Handle<v8::internal::Object> obj);
 210   static inline Local<StackTrace> StackTraceToLocal(
 211       v8::internal::Handle<v8::internal::JSArray> obj);
 212   static inline Local<StackFrame> StackFrameToLocal(
 213       v8::internal::Handle<v8::internal::JSObject> obj);
 214   static inline Local<Number> NumberToLocal(
 215       v8::internal::Handle<v8::internal::Object> obj);
 216   static inline Local<Integer> IntegerToLocal(
 217       v8::internal::Handle<v8::internal::Object> obj);
 218   static inline Local<Uint32> Uint32ToLocal(
 219       v8::internal::Handle<v8::internal::Object> obj);
 220   static inline Local<FunctionTemplate> ToLocal(
 221       v8::internal::Handle<v8::internal::FunctionTemplateInfo> obj);
 222   static inline Local<ObjectTemplate> ToLocal(
 223       v8::internal::Handle<v8::internal::ObjectTemplateInfo> obj);
 224   static inline Local<Signature> ToLocal(
 225       v8::internal::Handle<v8::internal::SignatureInfo> obj);
 226   static inline Local<AccessorSignature> AccessorSignatureToLocal(
 227       v8::internal::Handle<v8::internal::FunctionTemplateInfo> obj);
 228   static inline Local<TypeSwitch> ToLocal(
 229       v8::internal::Handle<v8::internal::TypeSwitchInfo> obj);
 230   static inline Local<External> ExternalToLocal(
 231       v8::internal::Handle<v8::internal::JSObject> obj);
 232   static inline Local<DeclaredAccessorDescriptor> ToLocal(
 233       v8::internal::Handle<v8::internal::DeclaredAccessorDescriptor> obj);
 234
 235 #define DECLARE_OPEN_HANDLE(From, To) \
 236   static inline v8::internal::Handle<v8::internal::To> \
 237       OpenHandle(const From* that, bool allow_empty_handle = false);
 238
 239 OPEN_HANDLE_LIST(DECLARE_OPEN_HANDLE)
 240
 241 #undef DECLARE_OPEN_HANDLE
 242 };
 243
 244
 245 template <class T>
 246 inline T* ToApi(v8::internal::Handle<v8::internal::Object> obj) {
 247   return reinterpret_cast<T*>(obj.location());
 248 }
 249
 250
 251 template <class T>
 252 v8::internal::Handle<T> v8::internal::Handle<T>::EscapeFrom(
 253     v8::HandleScope* scope) {
 254   v8::internal::Handle<T> handle;
 255   if (!is_null()) {
 256     handle = *this;
 257   }
 258   return Utils::OpenHandle(*scope->Close(Utils::ToLocal(handle)), true);
 259 }
 260
 261
 262 // Implementations of ToLocal
 263
 264 #define MAKE_TO_LOCAL(Name, From, To)                                       \
 265   Local<v8::To> Utils::Name(v8::internal::Handle<v8::internal::From> obj) { \
 266     ASSERT(obj.is_null() || !obj->IsTheHole());                             \
 267     return Local<To>(reinterpret_cast<To*>(obj.location()));                \
 268   }
 269
 270 MAKE_TO_LOCAL(ToLocal, Context, Context)
 271 MAKE_TO_LOCAL(ToLocal, Object, Value)
 272 MAKE_TO_LOCAL(ToLocal, JSFunction, Function)
 273 MAKE_TO_LOCAL(ToLocal, String, String)
 274 MAKE_TO_LOCAL(ToLocal, Symbol, Symbol)
 275 MAKE_TO_LOCAL(ToLocal, JSRegExp, RegExp)
 276 MAKE_TO_LOCAL(ToLocal, JSObject, Object)
 277 MAKE_TO_LOCAL(ToLocal, JSArray, Array)
 278 MAKE_TO_LOCAL(ToLocal, FunctionTemplateInfo, FunctionTemplate)
 279 MAKE_TO_LOCAL(ToLocal, ObjectTemplateInfo, ObjectTemplate)
 280 MAKE_TO_LOCAL(ToLocal, SignatureInfo, Signature)
 281 MAKE_TO_LOCAL(AccessorSignatureToLocal, FunctionTemplateInfo, AccessorSignature)
 282 MAKE_TO_LOCAL(ToLocal, TypeSwitchInfo, TypeSwitch)
 283 MAKE_TO_LOCAL(MessageToLocal, Object, Message)
 284 MAKE_TO_LOCAL(StackTraceToLocal, JSArray, StackTrace)
 285 MAKE_TO_LOCAL(StackFrameToLocal, JSObject, StackFrame)
 286 MAKE_TO_LOCAL(NumberToLocal, Object, Number)
 287 MAKE_TO_LOCAL(IntegerToLocal, Object, Integer)
 288 MAKE_TO_LOCAL(Uint32ToLocal, Object, Uint32)
 289 MAKE_TO_LOCAL(ExternalToLocal, JSObject, External)
 290 MAKE_TO_LOCAL(ToLocal, DeclaredAccessorDescriptor, DeclaredAccessorDescriptor)
 291
 292 #undef MAKE_TO_LOCAL
 293
 294
 295 // Implementations of OpenHandle
 296
 297 #define MAKE_OPEN_HANDLE(From, To)                                          \
 298   v8::internal::Handle<v8::internal::To> Utils::OpenHandle(                 \
 299     const v8::From* that, bool allow_empty_handle) {                        \
 300     EXTRA_CHECK(allow_empty_handle || that != NULL);                        \
 301     EXTRA_CHECK(that == NULL ||                                             \
 302         !(*reinterpret_cast<v8::internal::To**>(                            \
 303             const_cast<v8::From*>(that)))->IsFailure());                    \
 304     return v8::internal::Handle<v8::internal::To>(                          \
 305         reinterpret_cast<v8::internal::To**>(const_cast<v8::From*>(that))); \
 306   }
 307
 308 OPEN_HANDLE_LIST(MAKE_OPEN_HANDLE)
 309
 310 #undef MAKE_OPEN_HANDLE
 311 #undef OPEN_HANDLE_LIST
 312
 313
 314 namespace internal {
 315
 316 // Tracks string usage to help make better decisions when
 317 // externalizing strings.
 318 //
 319 // Implementation note: internally this class only tracks fresh
 320 // strings and keeps a single use counter for them.
 321 class StringTracker {
 322  public:
 323   // Records that the given string's characters were copied to some
 324   // external buffer. If this happens often we should honor
 325   // externalization requests for the string.
 326   void RecordWrite(Handle<String> string) {
 327     Address address = reinterpret_cast<Address>(*string);
 328     Address top = isolate_->heap()->NewSpaceTop();
 329     if (IsFreshString(address, top)) {
 330       IncrementUseCount(top);
 331     }
 332   }
 333
 334   // Estimates freshness and use frequency of the given string based
 335   // on how close it is to the new space top and the recorded usage
 336   // history.
 337   inline bool IsFreshUnusedString(Handle<String> string) {
 338     Address address = reinterpret_cast<Address>(*string);
 339     Address top = isolate_->heap()->NewSpaceTop();
 340     return IsFreshString(address, top) && IsUseCountLow(top);
 341   }
 342
 343  private:
 344   StringTracker() : use_count_(0), last_top_(NULL), isolate_(NULL) { }
 345
 346   static inline bool IsFreshString(Address string, Address top) {
 347     return top - kFreshnessLimit <= string && string <= top;
 348   }
 349
 350   inline bool IsUseCountLow(Address top) {
 351     if (last_top_ != top) return true;
 352     return use_count_ < kUseLimit;
 353   }
 354
 355   inline void IncrementUseCount(Address top) {
 356     if (last_top_ != top) {
 357       use_count_ = 0;
 358       last_top_ = top;
 359     }
 360     ++use_count_;
 361   }
 362
 363   // Single use counter shared by all fresh strings.
 364   int use_count_;
 365
 366   // Last new space top when the use count above was valid.
 367   Address last_top_;
 368
 369   Isolate* isolate_;
 370
 371   // How close to the new space top a fresh string has to be.
 372   static const int kFreshnessLimit = 1024;
 373
 374   // The number of uses required to consider a string useful.
 375   static const int kUseLimit = 32;
 376
 377   friend class Isolate;
 378
 379   DISALLOW_COPY_AND_ASSIGN(StringTracker);
 380 };
 381
 382
 383 class DeferredHandles {
 384  public:
 385   ~DeferredHandles();
 386
 387  private:
 388   DeferredHandles(Object** first_block_limit, Isolate* isolate)
 389       : next_(NULL),
 390         previous_(NULL),
 391         first_block_limit_(first_block_limit),
 392         isolate_(isolate) {
 393     isolate->LinkDeferredHandles(this);
 394   }
 395
 396   void Iterate(ObjectVisitor* v);
 397
 398   List<Object**> blocks_;
 399   DeferredHandles* next_;
 400   DeferredHandles* previous_;
 401   Object** first_block_limit_;
 402   Isolate* isolate_;
 403
 404   friend class HandleScopeImplementer;
 405   friend class Isolate;
 406 };
 407
 408
 409 // This class is here in order to be able to declare it a friend of
 410 // HandleScope.  Moving these methods to be members of HandleScope would be
 411 // neat in some ways, but it would expose internal implementation details in
 412 // our public header file, which is undesirable.
 413 //
 414 // An isolate has a single instance of this class to hold the current thread's
 415 // data. In multithreaded V8 programs this data is copied in and out of storage
 416 // so that the currently executing thread always has its own copy of this
 417 // data.
 418 class HandleScopeImplementer {
 419  public:
 420   explicit HandleScopeImplementer(Isolate* isolate)
 421       : isolate_(isolate),
 422         blocks_(0),
 423         entered_contexts_(0),
 424         saved_contexts_(0),
 425         spare_(NULL),
 426         call_depth_(0),
 427         last_handle_before_deferred_block_(NULL) { }
 428
 429   ~HandleScopeImplementer() {
 430     DeleteArray(spare_);
 431   }
 432
 433   // Threading support for handle data.
 434   static int ArchiveSpacePerThread();
 435   char* RestoreThread(char* from);
 436   char* ArchiveThread(char* to);
 437   void FreeThreadResources();
 438
 439   // Garbage collection support.
 440   void Iterate(v8::internal::ObjectVisitor* v);
 441   static char* Iterate(v8::internal::ObjectVisitor* v, char* data);
 442
 443
 444   inline internal::Object** GetSpareOrNewBlock();
 445   inline void DeleteExtensions(internal::Object** prev_limit);
 446
 447   inline void IncrementCallDepth() {call_depth_++;}
 448   inline void DecrementCallDepth() {call_depth_--;}
 449   inline bool CallDepthIsZero() { return call_depth_ == 0; }
 450
 451   inline void EnterContext(Handle<Object> context);
 452   inline bool LeaveLastContext();
 453
 454   // Returns the last entered context or an empty handle if no
 455   // contexts have been entered.
 456   inline Handle<Object> LastEnteredContext();
 457
 458   inline void SaveContext(Context* context);
 459   inline Context* RestoreContext();
 460   inline bool HasSavedContexts();
 461
 462   inline List<internal::Object**>* blocks() { return &blocks_; }
 463   Isolate* isolate() const { return isolate_; }
 464
 465   void ReturnBlock(Object** block) {
 466     ASSERT(block != NULL);
 467     if (spare_ != NULL) DeleteArray(spare_);
 468     spare_ = block;
 469   }
 470
 471  private:
 472   void ResetAfterArchive() {
 473     blocks_.Initialize(0);
 474     entered_contexts_.Initialize(0);
 475     saved_contexts_.Initialize(0);
 476     spare_ = NULL;
 477     last_handle_before_deferred_block_ = NULL;
 478     call_depth_ = 0;
 479   }
 480
 481   void Free() {
 482     ASSERT(blocks_.length() == 0);
 483     ASSERT(entered_contexts_.length() == 0);
 484     ASSERT(saved_contexts_.length() == 0);
 485     blocks_.Free();
 486     entered_contexts_.Free();
 487     saved_contexts_.Free();
 488     if (spare_ != NULL) {
 489       DeleteArray(spare_);
 490       spare_ = NULL;
 491     }
 492     ASSERT(call_depth_ == 0);
 493   }
 494
 495   void BeginDeferredScope();
 496   DeferredHandles* Detach(Object** prev_limit);
 497
 498   Isolate* isolate_;
 499   List<internal::Object**> blocks_;
 500   // Used as a stack to keep track of entered contexts.
 501   List<Handle<Object> > entered_contexts_;
 502   // Used as a stack to keep track of saved contexts.
 503   List<Context*> saved_contexts_;
 504   Object** spare_;
 505   int call_depth_;
 506   Object** last_handle_before_deferred_block_;
 507   // This is only used for threading support.
 508   v8::ImplementationUtilities::HandleScopeData handle_scope_data_;
 509
 510   void IterateThis(ObjectVisitor* v);
 511   char* RestoreThreadHelper(char* from);
 512   char* ArchiveThreadHelper(char* to);
 513
 514   friend class DeferredHandles;
 515   friend class DeferredHandleScope;
 516
 517   DISALLOW_COPY_AND_ASSIGN(HandleScopeImplementer);
 518 };
 519
 520
 521 const int kHandleBlockSize = v8::internal::KB - 2;  // fit in one page
 522
 523
 524 void HandleScopeImplementer::SaveContext(Context* context) {
 525   saved_contexts_.Add(context);
 526 }
 527
 528
 529 Context* HandleScopeImplementer::RestoreContext() {
 530   return saved_contexts_.RemoveLast();
 531 }
 532
 533
 534 bool HandleScopeImplementer::HasSavedContexts() {
 535   return !saved_contexts_.is_empty();
 536 }
 537
 538
 539 void HandleScopeImplementer::EnterContext(Handle<Object> context) {
 540   entered_contexts_.Add(context);
 541 }
 542
 543
 544 bool HandleScopeImplementer::LeaveLastContext() {
 545   if (entered_contexts_.is_empty()) return false;
 546   entered_contexts_.RemoveLast();
 547   return true;
 548 }
 549
 550
 551 Handle<Object> HandleScopeImplementer::LastEnteredContext() {
 552   if (entered_contexts_.is_empty()) return Handle<Object>::null();
 553   return entered_contexts_.last();
 554 }
 555
 556
 557 // If there's a spare block, use it for growing the current scope.
 558 internal::Object** HandleScopeImplementer::GetSpareOrNewBlock() {
 559   internal::Object** block = (spare_ != NULL) ?
 560       spare_ :
 561       NewArray<internal::Object*>(kHandleBlockSize);
 562   spare_ = NULL;
 563   return block;
 564 }
 565
 566
 567 void HandleScopeImplementer::DeleteExtensions(internal::Object** prev_limit) {
 568   while (!blocks_.is_empty()) {
 569     internal::Object** block_start = blocks_.last();
 570     internal::Object** block_limit = block_start + kHandleBlockSize;
 571 #ifdef DEBUG
 572     // NoHandleAllocation may make the prev_limit to point inside the block.
 573     if (block_start <= prev_limit && prev_limit <= block_limit) break;
 574 #else
 575     if (prev_limit == block_limit) break;
 576 #endif
 577
 578     blocks_.RemoveLast();
 579 #ifdef ENABLE_EXTRA_CHECKS
 580     internal::HandleScope::ZapRange(block_start, block_limit);
 581 #endif
 582     if (spare_ != NULL) {
 583       DeleteArray(spare_);
 584     }
 585     spare_ = block_start;
 586   }
 587   ASSERT((blocks_.is_empty() && prev_limit == NULL) ||
 588          (!blocks_.is_empty() && prev_limit != NULL));
 589 }
 590
 591
 592 class Testing {
 593  public:
 594   static v8::Testing::StressType stress_type() { return stress_type_; }
 595   static void set_stress_type(v8::Testing::StressType stress_type) {
 596     stress_type_ = stress_type;
 597   }
 598
 599  private:
 600   static v8::Testing::StressType stress_type_;
 601 };
 602
 603 } }  // namespace v8::internal
 604
 605 #endif  // V8_API_H_