ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 1 | // Copyright 2008 the V8 project authors. All rights reserved. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | |
| 28 | #ifndef V8_API_H_ |
| 29 | #define V8_API_H_ |
| 30 | |
| 31 | #include "factory.h" |
| 32 | |
| 33 | namespace v8 { |
| 34 | |
| 35 | // Constants used in the implementation of the API. The most natural thing |
| 36 | // would usually be to place these with the classes that use them, but |
| 37 | // we want to keep them out of v8.h because it is an externally |
| 38 | // visible file. |
| 39 | class Consts { |
| 40 | public: |
| 41 | enum TemplateType { |
| 42 | FUNCTION_TEMPLATE = 0, |
| 43 | OBJECT_TEMPLATE = 1 |
| 44 | }; |
| 45 | }; |
| 46 | |
| 47 | |
| 48 | // Utilities for working with neander-objects, primitive |
| 49 | // env-independent JSObjects used by the api. |
| 50 | class NeanderObject { |
| 51 | public: |
| 52 | explicit NeanderObject(int size); |
| 53 | inline NeanderObject(v8::internal::Handle<v8::internal::Object> obj); |
| 54 | inline NeanderObject(v8::internal::Object* obj); |
| 55 | inline v8::internal::Object* get(int index); |
| 56 | inline void set(int index, v8::internal::Object* value); |
| 57 | inline v8::internal::Handle<v8::internal::JSObject> value() { return value_; } |
| 58 | int size(); |
| 59 | private: |
| 60 | v8::internal::Handle<v8::internal::JSObject> value_; |
| 61 | }; |
| 62 | |
| 63 | |
| 64 | // Utilities for working with neander-arrays, a simple extensible |
| 65 | // array abstraction built on neander-objects. |
| 66 | class NeanderArray { |
| 67 | public: |
| 68 | NeanderArray(); |
| 69 | inline NeanderArray(v8::internal::Handle<v8::internal::Object> obj); |
| 70 | inline v8::internal::Handle<v8::internal::JSObject> value() { |
| 71 | return obj_.value(); |
| 72 | } |
| 73 | |
| 74 | void add(v8::internal::Handle<v8::internal::Object> value); |
| 75 | |
| 76 | int length(); |
| 77 | |
| 78 | v8::internal::Object* get(int index); |
| 79 | // Change the value at an index to undefined value. If the index is |
| 80 | // out of bounds, the request is ignored. Returns the old value. |
| 81 | void set(int index, v8::internal::Object* value); |
| 82 | private: |
| 83 | NeanderObject obj_; |
| 84 | }; |
| 85 | |
| 86 | |
| 87 | NeanderObject::NeanderObject(v8::internal::Handle<v8::internal::Object> obj) |
| 88 | : value_(v8::internal::Handle<v8::internal::JSObject>::cast(obj)) { } |
| 89 | |
| 90 | |
| 91 | NeanderObject::NeanderObject(v8::internal::Object* obj) |
| 92 | : value_(v8::internal::Handle<v8::internal::JSObject>( |
| 93 | v8::internal::JSObject::cast(obj))) { } |
| 94 | |
| 95 | |
| 96 | NeanderArray::NeanderArray(v8::internal::Handle<v8::internal::Object> obj) |
| 97 | : obj_(obj) { } |
| 98 | |
| 99 | |
| 100 | v8::internal::Object* NeanderObject::get(int offset) { |
| 101 | ASSERT(value()->HasFastElements()); |
| 102 | return v8::internal::FixedArray::cast(value()->elements())->get(offset); |
| 103 | } |
| 104 | |
| 105 | |
| 106 | void NeanderObject::set(int offset, v8::internal::Object* value) { |
| 107 | ASSERT(value_->HasFastElements()); |
| 108 | v8::internal::FixedArray::cast(value_->elements())->set(offset, value); |
| 109 | } |
| 110 | |
| 111 | |
| 112 | template <typename T> static inline T ToCData(v8::internal::Object* obj) { |
| 113 | STATIC_ASSERT(sizeof(T) == sizeof(v8::internal::Address)); |
| 114 | return reinterpret_cast<T>( |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 115 | reinterpret_cast<intptr_t>(v8::internal::Proxy::cast(obj)->proxy())); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 116 | } |
| 117 | |
| 118 | |
| 119 | template <typename T> |
| 120 | static inline v8::internal::Handle<v8::internal::Object> FromCData(T obj) { |
| 121 | STATIC_ASSERT(sizeof(T) == sizeof(v8::internal::Address)); |
| 122 | return v8::internal::Factory::NewProxy( |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 123 | reinterpret_cast<v8::internal::Address>(reinterpret_cast<intptr_t>(obj))); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 124 | } |
| 125 | |
| 126 | |
| 127 | v8::Arguments::Arguments(v8::Local<v8::Value> data, |
| 128 | v8::Local<v8::Object> holder, |
| 129 | v8::Local<v8::Function> callee, |
| 130 | bool is_construct_call, |
| 131 | void** values, int length) |
| 132 | : data_(data), holder_(holder), callee_(callee), |
| 133 | is_construct_call_(is_construct_call), |
| 134 | values_(values), length_(length) { } |
| 135 | |
| 136 | |
| 137 | enum ExtensionTraversalState { |
| 138 | UNVISITED, VISITED, INSTALLED |
| 139 | }; |
| 140 | |
| 141 | |
| 142 | class RegisteredExtension { |
| 143 | public: |
| 144 | explicit RegisteredExtension(Extension* extension); |
| 145 | static void Register(RegisteredExtension* that); |
| 146 | Extension* extension() { return extension_; } |
| 147 | RegisteredExtension* next() { return next_; } |
| 148 | RegisteredExtension* next_auto() { return next_auto_; } |
| 149 | ExtensionTraversalState state() { return state_; } |
| 150 | void set_state(ExtensionTraversalState value) { state_ = value; } |
| 151 | static RegisteredExtension* first_extension() { return first_extension_; } |
| 152 | private: |
| 153 | Extension* extension_; |
| 154 | RegisteredExtension* next_; |
| 155 | RegisteredExtension* next_auto_; |
| 156 | ExtensionTraversalState state_; |
| 157 | static RegisteredExtension* first_extension_; |
| 158 | static RegisteredExtension* first_auto_extension_; |
| 159 | }; |
| 160 | |
| 161 | |
| 162 | class ImplementationUtilities { |
| 163 | public: |
| 164 | static v8::Handle<v8::Primitive> Undefined(); |
| 165 | static v8::Handle<v8::Primitive> Null(); |
| 166 | static v8::Handle<v8::Boolean> True(); |
| 167 | static v8::Handle<v8::Boolean> False(); |
| 168 | |
| 169 | static int GetNameCount(ExtensionConfiguration* that) { |
| 170 | return that->name_count_; |
| 171 | } |
| 172 | |
| 173 | static const char** GetNames(ExtensionConfiguration* that) { |
| 174 | return that->names_; |
| 175 | } |
| 176 | |
| 177 | static v8::Arguments NewArguments(Local<Value> data, |
| 178 | Local<Object> holder, |
| 179 | Local<Function> callee, |
| 180 | bool is_construct_call, |
| 181 | void** argv, int argc) { |
| 182 | return v8::Arguments(data, holder, callee, is_construct_call, argv, argc); |
| 183 | } |
| 184 | |
| 185 | // Introduce an alias for the handle scope data to allow non-friends |
| 186 | // to access the HandleScope data. |
| 187 | typedef v8::HandleScope::Data HandleScopeData; |
| 188 | |
| 189 | static HandleScopeData* CurrentHandleScope() { |
| 190 | return &v8::HandleScope::current_; |
| 191 | } |
| 192 | |
| 193 | #ifdef DEBUG |
| 194 | static void ZapHandleRange(void** begin, void** end) { |
| 195 | v8::HandleScope::ZapRange(begin, end); |
| 196 | } |
| 197 | #endif |
| 198 | }; |
| 199 | |
| 200 | |
| 201 | class Utils { |
| 202 | public: |
| 203 | static bool ReportApiFailure(const char* location, const char* message); |
| 204 | |
| 205 | static Local<FunctionTemplate> ToFunctionTemplate(NeanderObject obj); |
| 206 | static Local<ObjectTemplate> ToObjectTemplate(NeanderObject obj); |
| 207 | |
| 208 | static inline Local<Context> ToLocal( |
| 209 | v8::internal::Handle<v8::internal::Context> obj); |
| 210 | static inline Local<Value> ToLocal( |
| 211 | v8::internal::Handle<v8::internal::Object> obj); |
| 212 | static inline Local<Function> ToLocal( |
| 213 | v8::internal::Handle<v8::internal::JSFunction> obj); |
| 214 | static inline Local<String> ToLocal( |
| 215 | v8::internal::Handle<v8::internal::String> obj); |
| 216 | static inline Local<Object> ToLocal( |
| 217 | v8::internal::Handle<v8::internal::JSObject> obj); |
| 218 | static inline Local<Array> ToLocal( |
| 219 | v8::internal::Handle<v8::internal::JSArray> obj); |
| 220 | static inline Local<External> ToLocal( |
| 221 | v8::internal::Handle<v8::internal::Proxy> obj); |
| 222 | static inline Local<Message> MessageToLocal( |
| 223 | v8::internal::Handle<v8::internal::Object> obj); |
| 224 | static inline Local<Number> NumberToLocal( |
| 225 | v8::internal::Handle<v8::internal::Object> obj); |
| 226 | static inline Local<Integer> IntegerToLocal( |
| 227 | v8::internal::Handle<v8::internal::Object> obj); |
| 228 | static inline Local<Uint32> Uint32ToLocal( |
| 229 | v8::internal::Handle<v8::internal::Object> obj); |
| 230 | static inline Local<FunctionTemplate> ToLocal( |
| 231 | v8::internal::Handle<v8::internal::FunctionTemplateInfo> obj); |
| 232 | static inline Local<ObjectTemplate> ToLocal( |
| 233 | v8::internal::Handle<v8::internal::ObjectTemplateInfo> obj); |
| 234 | static inline Local<Signature> ToLocal( |
| 235 | v8::internal::Handle<v8::internal::SignatureInfo> obj); |
| 236 | static inline Local<TypeSwitch> ToLocal( |
| 237 | v8::internal::Handle<v8::internal::TypeSwitchInfo> obj); |
| 238 | |
| 239 | static inline v8::internal::Handle<v8::internal::TemplateInfo> |
| 240 | OpenHandle(Template* that); |
| 241 | static inline v8::internal::Handle<v8::internal::FunctionTemplateInfo> |
| 242 | OpenHandle(FunctionTemplate* that); |
| 243 | static inline v8::internal::Handle<v8::internal::ObjectTemplateInfo> |
| 244 | OpenHandle(ObjectTemplate* that); |
| 245 | static inline v8::internal::Handle<v8::internal::Object> |
| 246 | OpenHandle(Data* data); |
| 247 | static inline v8::internal::Handle<v8::internal::JSObject> |
| 248 | OpenHandle(v8::Object* data); |
| 249 | static inline v8::internal::Handle<v8::internal::JSArray> |
| 250 | OpenHandle(v8::Array* data); |
| 251 | static inline v8::internal::Handle<v8::internal::String> |
| 252 | OpenHandle(String* data); |
| 253 | static inline v8::internal::Handle<v8::internal::JSFunction> |
| 254 | OpenHandle(Script* data); |
| 255 | static inline v8::internal::Handle<v8::internal::JSFunction> |
| 256 | OpenHandle(Function* data); |
| 257 | static inline v8::internal::Handle<v8::internal::JSObject> |
| 258 | OpenHandle(Message* message); |
| 259 | static inline v8::internal::Handle<v8::internal::Context> |
| 260 | OpenHandle(v8::Context* context); |
| 261 | static inline v8::internal::Handle<v8::internal::SignatureInfo> |
| 262 | OpenHandle(v8::Signature* sig); |
| 263 | static inline v8::internal::Handle<v8::internal::TypeSwitchInfo> |
| 264 | OpenHandle(v8::TypeSwitch* that); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 265 | static inline v8::internal::Handle<v8::internal::Proxy> |
| 266 | OpenHandle(v8::External* that); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 267 | }; |
| 268 | |
| 269 | |
| 270 | template <class T> |
| 271 | static inline T* ToApi(v8::internal::Handle<v8::internal::Object> obj) { |
| 272 | return reinterpret_cast<T*>(obj.location()); |
| 273 | } |
| 274 | |
| 275 | |
| 276 | template <class T> |
| 277 | v8::internal::Handle<T> v8::internal::Handle<T>::EscapeFrom( |
| 278 | HandleScope* scope) { |
| 279 | return Utils::OpenHandle(*scope->Close(Utils::ToLocal(*this))); |
| 280 | } |
| 281 | |
| 282 | |
| 283 | // Implementations of ToLocal |
| 284 | |
| 285 | #define MAKE_TO_LOCAL(Name, From, To) \ |
| 286 | Local<v8::To> Utils::Name(v8::internal::Handle<v8::internal::From> obj) { \ |
| 287 | return Local<To>(reinterpret_cast<To*>(obj.location())); \ |
| 288 | } |
| 289 | |
| 290 | MAKE_TO_LOCAL(ToLocal, Context, Context) |
| 291 | MAKE_TO_LOCAL(ToLocal, Object, Value) |
| 292 | MAKE_TO_LOCAL(ToLocal, JSFunction, Function) |
| 293 | MAKE_TO_LOCAL(ToLocal, String, String) |
| 294 | MAKE_TO_LOCAL(ToLocal, JSObject, Object) |
| 295 | MAKE_TO_LOCAL(ToLocal, JSArray, Array) |
| 296 | MAKE_TO_LOCAL(ToLocal, Proxy, External) |
| 297 | MAKE_TO_LOCAL(ToLocal, FunctionTemplateInfo, FunctionTemplate) |
| 298 | MAKE_TO_LOCAL(ToLocal, ObjectTemplateInfo, ObjectTemplate) |
| 299 | MAKE_TO_LOCAL(ToLocal, SignatureInfo, Signature) |
| 300 | MAKE_TO_LOCAL(ToLocal, TypeSwitchInfo, TypeSwitch) |
| 301 | MAKE_TO_LOCAL(MessageToLocal, Object, Message) |
| 302 | MAKE_TO_LOCAL(NumberToLocal, Object, Number) |
| 303 | MAKE_TO_LOCAL(IntegerToLocal, Object, Integer) |
| 304 | MAKE_TO_LOCAL(Uint32ToLocal, Object, Uint32) |
| 305 | |
| 306 | #undef MAKE_TO_LOCAL |
| 307 | |
| 308 | |
| 309 | // Implementations of OpenHandle |
| 310 | |
| 311 | #define MAKE_OPEN_HANDLE(From, To) \ |
| 312 | v8::internal::Handle<v8::internal::To> Utils::OpenHandle(v8::From* that) { \ |
| 313 | return v8::internal::Handle<v8::internal::To>( \ |
| 314 | reinterpret_cast<v8::internal::To**>(that)); \ |
| 315 | } |
| 316 | |
| 317 | MAKE_OPEN_HANDLE(Template, TemplateInfo) |
| 318 | MAKE_OPEN_HANDLE(FunctionTemplate, FunctionTemplateInfo) |
| 319 | MAKE_OPEN_HANDLE(ObjectTemplate, ObjectTemplateInfo) |
| 320 | MAKE_OPEN_HANDLE(Signature, SignatureInfo) |
| 321 | MAKE_OPEN_HANDLE(TypeSwitch, TypeSwitchInfo) |
| 322 | MAKE_OPEN_HANDLE(Data, Object) |
| 323 | MAKE_OPEN_HANDLE(Object, JSObject) |
| 324 | MAKE_OPEN_HANDLE(Array, JSArray) |
| 325 | MAKE_OPEN_HANDLE(String, String) |
| 326 | MAKE_OPEN_HANDLE(Script, JSFunction) |
| 327 | MAKE_OPEN_HANDLE(Function, JSFunction) |
| 328 | MAKE_OPEN_HANDLE(Message, JSObject) |
| 329 | MAKE_OPEN_HANDLE(Context, Context) |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 330 | MAKE_OPEN_HANDLE(External, Proxy) |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 331 | |
| 332 | #undef MAKE_OPEN_HANDLE |
| 333 | |
| 334 | |
| 335 | namespace internal { |
| 336 | |
| 337 | // This class is here in order to be able to declare it a friend of |
| 338 | // HandleScope. Moving these methods to be members of HandleScope would be |
| 339 | // neat in some ways, but it would expose external implementation details in |
| 340 | // our public header file, which is undesirable. |
| 341 | // |
| 342 | // There is a singleton instance of this class to hold the per-thread data. |
| 343 | // For multithreaded V8 programs this data is copied in and out of storage |
| 344 | // so that the currently executing thread always has its own copy of this |
| 345 | // data. |
| 346 | class HandleScopeImplementer { |
| 347 | public: |
| 348 | |
| 349 | HandleScopeImplementer() |
| 350 | : blocks(0), |
kasper.lund | 4451067 | 2008-07-25 07:37:58 +0000 | [diff] [blame] | 351 | entered_contexts_(0), |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 352 | saved_contexts_(0) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 353 | Initialize(); |
| 354 | } |
| 355 | |
| 356 | void Initialize() { |
| 357 | blocks.Initialize(0); |
kasper.lund | 4451067 | 2008-07-25 07:37:58 +0000 | [diff] [blame] | 358 | entered_contexts_.Initialize(0); |
| 359 | saved_contexts_.Initialize(0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 360 | spare = NULL; |
| 361 | ignore_out_of_memory = false; |
| 362 | call_depth = 0; |
| 363 | } |
| 364 | |
| 365 | static HandleScopeImplementer* instance(); |
| 366 | |
| 367 | // Threading support for handle data. |
| 368 | static int ArchiveSpacePerThread(); |
| 369 | static char* RestoreThread(char* from); |
| 370 | static char* ArchiveThread(char* to); |
| 371 | |
| 372 | // Garbage collection support. |
| 373 | static void Iterate(v8::internal::ObjectVisitor* v); |
| 374 | static char* Iterate(v8::internal::ObjectVisitor* v, char* data); |
| 375 | |
| 376 | |
| 377 | inline void** GetSpareOrNewBlock(); |
| 378 | inline void DeleteExtensions(int extensions); |
| 379 | |
| 380 | inline void IncrementCallDepth() {call_depth++;} |
| 381 | inline void DecrementCallDepth() {call_depth--;} |
| 382 | inline bool CallDepthIsZero() { return call_depth == 0; } |
| 383 | |
kasper.lund | 4451067 | 2008-07-25 07:37:58 +0000 | [diff] [blame] | 384 | inline void EnterContext(Handle<Object> context); |
| 385 | inline bool LeaveLastContext(); |
| 386 | |
| 387 | // Returns the last entered context or an empty handle if no |
| 388 | // contexts have been entered. |
| 389 | inline Handle<Object> LastEnteredContext(); |
| 390 | |
| 391 | inline void SaveContext(Handle<Object> context); |
| 392 | inline Handle<Object> RestoreContext(); |
| 393 | inline bool HasSavedContexts(); |
| 394 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 395 | inline List<void**>* Blocks() { return &blocks; } |
| 396 | |
| 397 | inline bool IgnoreOutOfMemory() { return ignore_out_of_memory; } |
| 398 | inline void SetIgnoreOutOfMemory(bool value) { ignore_out_of_memory = value; } |
| 399 | |
| 400 | private: |
| 401 | List<void**> blocks; |
| 402 | Object** spare; |
| 403 | int call_depth; |
kasper.lund | 4451067 | 2008-07-25 07:37:58 +0000 | [diff] [blame] | 404 | // Used as a stack to keep track of entered contexts. |
| 405 | List<Handle<Object> > entered_contexts_; |
| 406 | // Used as a stack to keep track of saved contexts. |
| 407 | List<Handle<Object> > saved_contexts_; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 408 | bool ignore_out_of_memory; |
| 409 | // This is only used for threading support. |
| 410 | ImplementationUtilities::HandleScopeData handle_scope_data_; |
| 411 | |
| 412 | static void Iterate(ObjectVisitor* v, |
| 413 | List<void**>* blocks, |
| 414 | ImplementationUtilities::HandleScopeData* handle_data); |
| 415 | char* RestoreThreadHelper(char* from); |
| 416 | char* ArchiveThreadHelper(char* to); |
| 417 | |
mads.s.ager@gmail.com | 9a4089a | 2008-09-01 08:55:01 +0000 | [diff] [blame] | 418 | DISALLOW_COPY_AND_ASSIGN(HandleScopeImplementer); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 419 | }; |
| 420 | |
| 421 | |
| 422 | static const int kHandleBlockSize = v8::internal::KB - 2; // fit in one page |
| 423 | |
| 424 | |
kasper.lund | 4451067 | 2008-07-25 07:37:58 +0000 | [diff] [blame] | 425 | void HandleScopeImplementer::SaveContext(Handle<Object> context) { |
| 426 | saved_contexts_.Add(context); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 427 | } |
| 428 | |
| 429 | |
kasper.lund | 4451067 | 2008-07-25 07:37:58 +0000 | [diff] [blame] | 430 | Handle<Object> HandleScopeImplementer::RestoreContext() { |
| 431 | return saved_contexts_.RemoveLast(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 432 | } |
| 433 | |
| 434 | |
kasper.lund | 4451067 | 2008-07-25 07:37:58 +0000 | [diff] [blame] | 435 | bool HandleScopeImplementer::HasSavedContexts() { |
| 436 | return !saved_contexts_.is_empty(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 437 | } |
| 438 | |
| 439 | |
kasper.lund | 4451067 | 2008-07-25 07:37:58 +0000 | [diff] [blame] | 440 | void HandleScopeImplementer::EnterContext(Handle<Object> context) { |
| 441 | entered_contexts_.Add(context); |
| 442 | } |
| 443 | |
| 444 | |
| 445 | bool HandleScopeImplementer::LeaveLastContext() { |
| 446 | if (entered_contexts_.is_empty()) return false; |
| 447 | entered_contexts_.RemoveLast(); |
| 448 | return true; |
| 449 | } |
| 450 | |
| 451 | |
| 452 | Handle<Object> HandleScopeImplementer::LastEnteredContext() { |
| 453 | if (entered_contexts_.is_empty()) return Handle<Object>::null(); |
| 454 | return entered_contexts_.last(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 455 | } |
| 456 | |
| 457 | |
| 458 | // If there's a spare block, use it for growing the current scope. |
| 459 | void** HandleScopeImplementer::GetSpareOrNewBlock() { |
| 460 | void** block = (spare != NULL) ? |
| 461 | reinterpret_cast<void**>(spare) : |
| 462 | NewArray<void*>(kHandleBlockSize); |
| 463 | spare = NULL; |
| 464 | return block; |
| 465 | } |
| 466 | |
| 467 | |
| 468 | void HandleScopeImplementer::DeleteExtensions(int extensions) { |
| 469 | if (spare != NULL) { |
| 470 | DeleteArray(spare); |
| 471 | spare = NULL; |
| 472 | } |
| 473 | for (int i = extensions; i > 1; --i) { |
| 474 | void** block = blocks.RemoveLast(); |
| 475 | #ifdef DEBUG |
| 476 | ImplementationUtilities::ZapHandleRange(block, &block[kHandleBlockSize]); |
| 477 | #endif |
| 478 | DeleteArray(block); |
| 479 | } |
| 480 | spare = reinterpret_cast<Object**>(blocks.RemoveLast()); |
| 481 | #ifdef DEBUG |
| 482 | ImplementationUtilities::ZapHandleRange( |
| 483 | reinterpret_cast<void**>(spare), |
| 484 | reinterpret_cast<void**>(&spare[kHandleBlockSize])); |
| 485 | #endif |
| 486 | } |
| 487 | |
| 488 | } } // namespace v8::internal |
| 489 | |
| 490 | #endif // V8_API_H_ |