Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 1 | // Copyright 2012 the V8 project authors. All rights reserved. |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +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 | #include "v8.h" |
| 29 | |
| 30 | #include "objects.h" |
| 31 | #include "elements.h" |
| 32 | #include "utils.h" |
| 33 | |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 34 | |
| 35 | // Each concrete ElementsAccessor can handle exactly one ElementsKind, |
| 36 | // several abstract ElementsAccessor classes are used to allow sharing |
| 37 | // common code. |
| 38 | // |
| 39 | // Inheritance hierarchy: |
| 40 | // - ElementsAccessorBase (abstract) |
| 41 | // - FastElementsAccessor (abstract) |
| 42 | // - FastObjectElementsAccessor |
| 43 | // - FastDoubleElementsAccessor |
| 44 | // - ExternalElementsAccessor (abstract) |
| 45 | // - ExternalByteElementsAccessor |
| 46 | // - ExternalUnsignedByteElementsAccessor |
| 47 | // - ExternalShortElementsAccessor |
| 48 | // - ExternalUnsignedShortElementsAccessor |
| 49 | // - ExternalIntElementsAccessor |
| 50 | // - ExternalUnsignedIntElementsAccessor |
| 51 | // - ExternalFloatElementsAccessor |
| 52 | // - ExternalDoubleElementsAccessor |
| 53 | // - PixelElementsAccessor |
| 54 | // - DictionaryElementsAccessor |
| 55 | // - NonStrictArgumentsElementsAccessor |
| 56 | |
| 57 | |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 58 | namespace v8 { |
| 59 | namespace internal { |
| 60 | |
| 61 | |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 62 | // First argument in list is the accessor class, the second argument is the |
| 63 | // accessor ElementsKind, and the third is the backing store class. Use the |
| 64 | // fast element handler for smi-only arrays. The implementation is currently |
| 65 | // identical. Note that the order must match that of the ElementsKind enum for |
| 66 | // the |accessor_array[]| below to work. |
| 67 | #define ELEMENTS_LIST(V) \ |
| 68 | V(FastObjectElementsAccessor, FAST_SMI_ONLY_ELEMENTS, FixedArray) \ |
| 69 | V(FastObjectElementsAccessor, FAST_ELEMENTS, FixedArray) \ |
| 70 | V(FastDoubleElementsAccessor, FAST_DOUBLE_ELEMENTS, FixedDoubleArray) \ |
| 71 | V(DictionaryElementsAccessor, DICTIONARY_ELEMENTS, \ |
| 72 | SeededNumberDictionary) \ |
| 73 | V(NonStrictArgumentsElementsAccessor, NON_STRICT_ARGUMENTS_ELEMENTS, \ |
| 74 | FixedArray) \ |
| 75 | V(ExternalByteElementsAccessor, EXTERNAL_BYTE_ELEMENTS, \ |
| 76 | ExternalByteArray) \ |
| 77 | V(ExternalUnsignedByteElementsAccessor, \ |
| 78 | EXTERNAL_UNSIGNED_BYTE_ELEMENTS, ExternalUnsignedByteArray) \ |
| 79 | V(ExternalShortElementsAccessor, EXTERNAL_SHORT_ELEMENTS, \ |
| 80 | ExternalShortArray) \ |
| 81 | V(ExternalUnsignedShortElementsAccessor, \ |
| 82 | EXTERNAL_UNSIGNED_SHORT_ELEMENTS, ExternalUnsignedShortArray) \ |
| 83 | V(ExternalIntElementsAccessor, EXTERNAL_INT_ELEMENTS, \ |
| 84 | ExternalIntArray) \ |
| 85 | V(ExternalUnsignedIntElementsAccessor, \ |
| 86 | EXTERNAL_UNSIGNED_INT_ELEMENTS, ExternalUnsignedIntArray) \ |
| 87 | V(ExternalFloatElementsAccessor, \ |
| 88 | EXTERNAL_FLOAT_ELEMENTS, ExternalFloatArray) \ |
| 89 | V(ExternalDoubleElementsAccessor, \ |
| 90 | EXTERNAL_DOUBLE_ELEMENTS, ExternalDoubleArray) \ |
| 91 | V(PixelElementsAccessor, EXTERNAL_PIXEL_ELEMENTS, ExternalPixelArray) |
| 92 | |
| 93 | |
| 94 | template<ElementsKind Kind> class ElementsKindTraits { |
| 95 | public: |
| 96 | typedef FixedArrayBase BackingStore; |
| 97 | }; |
| 98 | |
| 99 | #define ELEMENTS_TRAITS(Class, KindParam, Store) \ |
| 100 | template<> class ElementsKindTraits<KindParam> { \ |
| 101 | public: \ |
| 102 | static const ElementsKind Kind = KindParam; \ |
| 103 | typedef Store BackingStore; \ |
| 104 | }; |
| 105 | ELEMENTS_LIST(ELEMENTS_TRAITS) |
| 106 | #undef ELEMENTS_TRAITS |
| 107 | |
| 108 | |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 109 | ElementsAccessor** ElementsAccessor::elements_accessors_; |
| 110 | |
| 111 | |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 112 | static bool HasKey(FixedArray* array, Object* key) { |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 113 | int len0 = array->length(); |
| 114 | for (int i = 0; i < len0; i++) { |
| 115 | Object* element = array->get(i); |
| 116 | if (element->IsSmi() && element == key) return true; |
| 117 | if (element->IsString() && |
| 118 | key->IsString() && String::cast(element)->Equals(String::cast(key))) { |
| 119 | return true; |
| 120 | } |
| 121 | } |
| 122 | return false; |
| 123 | } |
| 124 | |
| 125 | |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 126 | static Failure* ThrowArrayLengthRangeError(Heap* heap) { |
| 127 | HandleScope scope(heap->isolate()); |
| 128 | return heap->isolate()->Throw( |
| 129 | *heap->isolate()->factory()->NewRangeError("invalid_array_length", |
| 130 | HandleVector<Object>(NULL, 0))); |
| 131 | } |
| 132 | |
| 133 | |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 134 | void CopyObjectToObjectElements(FixedArray* from, |
| 135 | ElementsKind from_kind, |
| 136 | uint32_t from_start, |
| 137 | FixedArray* to, |
| 138 | ElementsKind to_kind, |
| 139 | uint32_t to_start, |
| 140 | int raw_copy_size) { |
| 141 | ASSERT(to->map() != HEAP->fixed_cow_array_map()); |
| 142 | ASSERT(from_kind == FAST_ELEMENTS || from_kind == FAST_SMI_ONLY_ELEMENTS); |
| 143 | ASSERT(to_kind == FAST_ELEMENTS || to_kind == FAST_SMI_ONLY_ELEMENTS); |
| 144 | int copy_size = raw_copy_size; |
| 145 | if (raw_copy_size < 0) { |
| 146 | ASSERT(raw_copy_size == ElementsAccessor::kCopyToEnd || |
| 147 | raw_copy_size == ElementsAccessor::kCopyToEndAndInitializeToHole); |
| 148 | copy_size = Min(from->length() - from_start, |
| 149 | to->length() - to_start); |
| 150 | #ifdef DEBUG |
| 151 | // FAST_ELEMENT arrays cannot be uninitialized. Ensure they are already |
| 152 | // marked with the hole. |
| 153 | if (raw_copy_size == ElementsAccessor::kCopyToEndAndInitializeToHole) { |
| 154 | for (int i = to_start + copy_size; i < to->length(); ++i) { |
| 155 | ASSERT(to->get(i)->IsTheHole()); |
| 156 | } |
| 157 | } |
| 158 | #endif |
| 159 | } |
| 160 | ASSERT((copy_size + static_cast<int>(to_start)) <= to->length() && |
| 161 | (copy_size + static_cast<int>(from_start)) <= from->length()); |
| 162 | if (copy_size == 0) return; |
| 163 | Address to_address = to->address() + FixedArray::kHeaderSize; |
| 164 | Address from_address = from->address() + FixedArray::kHeaderSize; |
| 165 | CopyWords(reinterpret_cast<Object**>(to_address) + to_start, |
| 166 | reinterpret_cast<Object**>(from_address) + from_start, |
| 167 | copy_size); |
| 168 | if (from_kind == FAST_ELEMENTS && to_kind == FAST_ELEMENTS) { |
| 169 | Heap* heap = from->GetHeap(); |
| 170 | if (!heap->InNewSpace(to)) { |
| 171 | heap->RecordWrites(to->address(), |
| 172 | to->OffsetOfElementAt(to_start), |
| 173 | copy_size); |
| 174 | } |
| 175 | heap->incremental_marking()->RecordWrites(to); |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | |
| 180 | static void CopyDictionaryToObjectElements(SeededNumberDictionary* from, |
| 181 | uint32_t from_start, |
| 182 | FixedArray* to, |
| 183 | ElementsKind to_kind, |
| 184 | uint32_t to_start, |
| 185 | int raw_copy_size) { |
| 186 | int copy_size = raw_copy_size; |
| 187 | Heap* heap = from->GetHeap(); |
| 188 | if (raw_copy_size < 0) { |
| 189 | ASSERT(raw_copy_size == ElementsAccessor::kCopyToEnd || |
| 190 | raw_copy_size == ElementsAccessor::kCopyToEndAndInitializeToHole); |
| 191 | copy_size = from->max_number_key() + 1 - from_start; |
| 192 | #ifdef DEBUG |
| 193 | // FAST_ELEMENT arrays cannot be uninitialized. Ensure they are already |
| 194 | // marked with the hole. |
| 195 | if (raw_copy_size == ElementsAccessor::kCopyToEndAndInitializeToHole) { |
| 196 | for (int i = to_start + copy_size; i < to->length(); ++i) { |
| 197 | ASSERT(to->get(i)->IsTheHole()); |
| 198 | } |
| 199 | } |
| 200 | #endif |
| 201 | } |
| 202 | ASSERT((copy_size + static_cast<int>(to_start)) <= to->length()); |
| 203 | ASSERT(to != from); |
| 204 | ASSERT(to_kind == FAST_ELEMENTS || to_kind == FAST_SMI_ONLY_ELEMENTS); |
| 205 | if (copy_size == 0) return; |
| 206 | for (int i = 0; i < copy_size; i++) { |
| 207 | int entry = from->FindEntry(i + from_start); |
| 208 | if (entry != SeededNumberDictionary::kNotFound) { |
| 209 | Object* value = from->ValueAt(entry); |
| 210 | ASSERT(!value->IsTheHole()); |
| 211 | to->set(i + to_start, value, SKIP_WRITE_BARRIER); |
| 212 | } else { |
| 213 | to->set_the_hole(i + to_start); |
| 214 | } |
| 215 | } |
| 216 | if (to_kind == FAST_ELEMENTS) { |
| 217 | if (!heap->InNewSpace(to)) { |
| 218 | heap->RecordWrites(to->address(), |
| 219 | to->OffsetOfElementAt(to_start), |
| 220 | copy_size); |
| 221 | } |
| 222 | heap->incremental_marking()->RecordWrites(to); |
| 223 | } |
| 224 | } |
| 225 | |
| 226 | |
| 227 | MUST_USE_RESULT static MaybeObject* CopyDoubleToObjectElements( |
| 228 | FixedDoubleArray* from, |
| 229 | uint32_t from_start, |
| 230 | FixedArray* to, |
| 231 | ElementsKind to_kind, |
| 232 | uint32_t to_start, |
| 233 | int raw_copy_size) { |
| 234 | ASSERT(to_kind == FAST_ELEMENTS || to_kind == FAST_SMI_ONLY_ELEMENTS); |
| 235 | int copy_size = raw_copy_size; |
| 236 | if (raw_copy_size < 0) { |
| 237 | ASSERT(raw_copy_size == ElementsAccessor::kCopyToEnd || |
| 238 | raw_copy_size == ElementsAccessor::kCopyToEndAndInitializeToHole); |
| 239 | copy_size = Min(from->length() - from_start, |
| 240 | to->length() - to_start); |
| 241 | #ifdef DEBUG |
| 242 | // FAST_ELEMENT arrays cannot be uninitialized. Ensure they are already |
| 243 | // marked with the hole. |
| 244 | if (raw_copy_size == ElementsAccessor::kCopyToEndAndInitializeToHole) { |
| 245 | for (int i = to_start + copy_size; i < to->length(); ++i) { |
| 246 | ASSERT(to->get(i)->IsTheHole()); |
| 247 | } |
| 248 | } |
| 249 | #endif |
| 250 | } |
| 251 | ASSERT((copy_size + static_cast<int>(to_start)) <= to->length() && |
| 252 | (copy_size + static_cast<int>(from_start)) <= from->length()); |
| 253 | if (copy_size == 0) return from; |
| 254 | for (int i = 0; i < copy_size; ++i) { |
| 255 | if (to_kind == FAST_SMI_ONLY_ELEMENTS) { |
| 256 | UNIMPLEMENTED(); |
| 257 | return Failure::Exception(); |
| 258 | } else { |
| 259 | MaybeObject* maybe_value = from->get(i + from_start); |
| 260 | Object* value; |
| 261 | ASSERT(to_kind == FAST_ELEMENTS); |
| 262 | // Because FAST_DOUBLE_ELEMENTS -> FAST_ELEMENT allocate HeapObjects |
| 263 | // iteratively, the allocate must succeed within a single GC cycle, |
| 264 | // otherwise the retry after the GC will also fail. In order to ensure |
| 265 | // that no GC is triggered, allocate HeapNumbers from old space if they |
| 266 | // can't be taken from new space. |
| 267 | if (!maybe_value->ToObject(&value)) { |
| 268 | ASSERT(maybe_value->IsRetryAfterGC() || maybe_value->IsOutOfMemory()); |
| 269 | Heap* heap = from->GetHeap(); |
| 270 | MaybeObject* maybe_value_object = |
| 271 | heap->AllocateHeapNumber(from->get_scalar(i + from_start), |
| 272 | TENURED); |
| 273 | if (!maybe_value_object->ToObject(&value)) return maybe_value_object; |
| 274 | } |
| 275 | to->set(i + to_start, value, UPDATE_WRITE_BARRIER); |
| 276 | } |
| 277 | } |
| 278 | return to; |
| 279 | } |
| 280 | |
| 281 | |
| 282 | static void CopyDoubleToDoubleElements(FixedDoubleArray* from, |
| 283 | uint32_t from_start, |
| 284 | FixedDoubleArray* to, |
| 285 | uint32_t to_start, |
| 286 | int raw_copy_size) { |
| 287 | int copy_size = raw_copy_size; |
| 288 | if (raw_copy_size < 0) { |
| 289 | ASSERT(raw_copy_size == ElementsAccessor::kCopyToEnd || |
| 290 | raw_copy_size == ElementsAccessor::kCopyToEndAndInitializeToHole); |
| 291 | copy_size = Min(from->length() - from_start, |
| 292 | to->length() - to_start); |
| 293 | if (raw_copy_size == ElementsAccessor::kCopyToEndAndInitializeToHole) { |
| 294 | for (int i = to_start + copy_size; i < to->length(); ++i) { |
| 295 | to->set_the_hole(i); |
| 296 | } |
| 297 | } |
| 298 | } |
| 299 | ASSERT((copy_size + static_cast<int>(to_start)) <= to->length() && |
| 300 | (copy_size + static_cast<int>(from_start)) <= from->length()); |
| 301 | if (copy_size == 0) return; |
| 302 | Address to_address = to->address() + FixedDoubleArray::kHeaderSize; |
| 303 | Address from_address = from->address() + FixedDoubleArray::kHeaderSize; |
| 304 | to_address += kDoubleSize * to_start; |
| 305 | from_address += kDoubleSize * from_start; |
| 306 | int words_per_double = (kDoubleSize / kPointerSize); |
| 307 | CopyWords(reinterpret_cast<Object**>(to_address), |
| 308 | reinterpret_cast<Object**>(from_address), |
| 309 | words_per_double * copy_size); |
| 310 | } |
| 311 | |
| 312 | |
| 313 | static void CopyObjectToDoubleElements(FixedArray* from, |
| 314 | uint32_t from_start, |
| 315 | FixedDoubleArray* to, |
| 316 | uint32_t to_start, |
| 317 | int raw_copy_size) { |
| 318 | int copy_size = raw_copy_size; |
| 319 | if (raw_copy_size < 0) { |
| 320 | ASSERT(raw_copy_size == ElementsAccessor::kCopyToEnd || |
| 321 | raw_copy_size == ElementsAccessor::kCopyToEndAndInitializeToHole); |
| 322 | copy_size = from->length() - from_start; |
| 323 | if (raw_copy_size == ElementsAccessor::kCopyToEndAndInitializeToHole) { |
| 324 | for (int i = to_start + copy_size; i < to->length(); ++i) { |
| 325 | to->set_the_hole(i); |
| 326 | } |
| 327 | } |
| 328 | } |
| 329 | ASSERT((copy_size + static_cast<int>(to_start)) <= to->length() && |
| 330 | (copy_size + static_cast<int>(from_start)) <= from->length()); |
| 331 | if (copy_size == 0) return; |
| 332 | for (int i = 0; i < copy_size; i++) { |
| 333 | Object* hole_or_object = from->get(i + from_start); |
| 334 | if (hole_or_object->IsTheHole()) { |
| 335 | to->set_the_hole(i + to_start); |
| 336 | } else { |
| 337 | to->set(i + to_start, hole_or_object->Number()); |
| 338 | } |
| 339 | } |
| 340 | } |
| 341 | |
| 342 | |
| 343 | static void CopyDictionaryToDoubleElements(SeededNumberDictionary* from, |
| 344 | uint32_t from_start, |
| 345 | FixedDoubleArray* to, |
| 346 | uint32_t to_start, |
| 347 | int raw_copy_size) { |
| 348 | int copy_size = raw_copy_size; |
| 349 | if (copy_size < 0) { |
| 350 | ASSERT(copy_size == ElementsAccessor::kCopyToEnd || |
| 351 | copy_size == ElementsAccessor::kCopyToEndAndInitializeToHole); |
| 352 | copy_size = from->max_number_key() + 1 - from_start; |
| 353 | if (raw_copy_size == ElementsAccessor::kCopyToEndAndInitializeToHole) { |
| 354 | for (int i = to_start + copy_size; i < to->length(); ++i) { |
| 355 | to->set_the_hole(i); |
| 356 | } |
| 357 | } |
| 358 | } |
| 359 | ASSERT(copy_size + static_cast<int>(to_start) <= to->length()); |
| 360 | if (copy_size == 0) return; |
| 361 | for (int i = 0; i < copy_size; i++) { |
| 362 | int entry = from->FindEntry(i + from_start); |
| 363 | if (entry != SeededNumberDictionary::kNotFound) { |
| 364 | to->set(i + to_start, from->ValueAt(entry)->Number()); |
| 365 | } else { |
| 366 | to->set_the_hole(i + to_start); |
| 367 | } |
| 368 | } |
| 369 | } |
| 370 | |
| 371 | |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 372 | // Base class for element handler implementations. Contains the |
| 373 | // the common logic for objects with different ElementsKinds. |
| 374 | // Subclasses must specialize method for which the element |
| 375 | // implementation differs from the base class implementation. |
| 376 | // |
| 377 | // This class is intended to be used in the following way: |
| 378 | // |
| 379 | // class SomeElementsAccessor : |
| 380 | // public ElementsAccessorBase<SomeElementsAccessor, |
| 381 | // BackingStoreClass> { |
| 382 | // ... |
| 383 | // } |
| 384 | // |
| 385 | // This is an example of the Curiously Recurring Template Pattern (see |
| 386 | // http://en.wikipedia.org/wiki/Curiously_recurring_template_pattern). We use |
| 387 | // CRTP to guarantee aggressive compile time optimizations (i.e. inlining and |
| 388 | // specialization of SomeElementsAccessor methods). |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 389 | template <typename ElementsAccessorSubclass, |
| 390 | typename ElementsTraitsParam> |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 391 | class ElementsAccessorBase : public ElementsAccessor { |
| 392 | protected: |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 393 | explicit ElementsAccessorBase(const char* name) |
| 394 | : ElementsAccessor(name) { } |
| 395 | |
| 396 | typedef ElementsTraitsParam ElementsTraits; |
| 397 | typedef typename ElementsTraitsParam::BackingStore BackingStore; |
| 398 | |
| 399 | virtual ElementsKind kind() const { return ElementsTraits::Kind; } |
| 400 | |
| 401 | static bool HasElementImpl(Object* receiver, |
| 402 | JSObject* holder, |
| 403 | uint32_t key, |
| 404 | BackingStore* backing_store) { |
| 405 | MaybeObject* element = |
| 406 | ElementsAccessorSubclass::GetImpl(receiver, holder, key, backing_store); |
| 407 | return !element->IsTheHole(); |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 408 | } |
| 409 | |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 410 | virtual bool HasElement(Object* receiver, |
| 411 | JSObject* holder, |
| 412 | uint32_t key, |
| 413 | FixedArrayBase* backing_store) { |
| 414 | if (backing_store == NULL) { |
| 415 | backing_store = holder->elements(); |
| 416 | } |
| 417 | return ElementsAccessorSubclass::HasElementImpl( |
| 418 | receiver, holder, key, BackingStore::cast(backing_store)); |
| 419 | } |
| 420 | |
| 421 | virtual MaybeObject* Get(Object* receiver, |
| 422 | JSObject* holder, |
| 423 | uint32_t key, |
| 424 | FixedArrayBase* backing_store) { |
| 425 | if (backing_store == NULL) { |
| 426 | backing_store = holder->elements(); |
| 427 | } |
| 428 | return ElementsAccessorSubclass::GetImpl( |
| 429 | receiver, holder, key, BackingStore::cast(backing_store)); |
| 430 | } |
| 431 | |
| 432 | static MaybeObject* GetImpl(Object* receiver, |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 433 | JSObject* obj, |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 434 | uint32_t key, |
| 435 | BackingStore* backing_store) { |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 436 | return (key < ElementsAccessorSubclass::GetCapacityImpl(backing_store)) |
| 437 | ? backing_store->get(key) |
| 438 | : backing_store->GetHeap()->the_hole_value(); |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 439 | } |
| 440 | |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 441 | virtual MaybeObject* SetLength(JSArray* array, |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 442 | Object* length) { |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 443 | return ElementsAccessorSubclass::SetLengthImpl( |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 444 | array, length, BackingStore::cast(array->elements())); |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 445 | } |
| 446 | |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 447 | static MaybeObject* SetLengthImpl(JSObject* obj, |
| 448 | Object* length, |
| 449 | BackingStore* backing_store); |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 450 | |
Ben Murdoch | c7cc028 | 2012-03-05 14:35:55 +0000 | [diff] [blame] | 451 | virtual MaybeObject* SetCapacityAndLength(JSArray* array, |
| 452 | int capacity, |
| 453 | int length) { |
| 454 | return ElementsAccessorSubclass::SetFastElementsCapacityAndLength( |
| 455 | array, |
| 456 | capacity, |
| 457 | length); |
| 458 | } |
| 459 | |
| 460 | static MaybeObject* SetFastElementsCapacityAndLength(JSObject* obj, |
| 461 | int capacity, |
| 462 | int length) { |
| 463 | UNIMPLEMENTED(); |
| 464 | return obj; |
| 465 | } |
| 466 | |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 467 | virtual MaybeObject* Delete(JSObject* obj, |
| 468 | uint32_t key, |
| 469 | JSReceiver::DeleteMode mode) = 0; |
| 470 | |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 471 | static MaybeObject* CopyElementsImpl(FixedArrayBase* from, |
| 472 | uint32_t from_start, |
| 473 | FixedArrayBase* to, |
| 474 | ElementsKind to_kind, |
| 475 | uint32_t to_start, |
| 476 | int copy_size) { |
| 477 | UNREACHABLE(); |
| 478 | return NULL; |
| 479 | } |
| 480 | |
| 481 | virtual MaybeObject* CopyElements(JSObject* from_holder, |
| 482 | uint32_t from_start, |
| 483 | FixedArrayBase* to, |
| 484 | ElementsKind to_kind, |
| 485 | uint32_t to_start, |
| 486 | int copy_size, |
| 487 | FixedArrayBase* from) { |
| 488 | if (from == NULL) { |
| 489 | from = from_holder->elements(); |
| 490 | } |
| 491 | if (from->length() == 0) { |
| 492 | return from; |
| 493 | } |
| 494 | return ElementsAccessorSubclass::CopyElementsImpl( |
| 495 | from, from_start, to, to_kind, to_start, copy_size); |
| 496 | } |
| 497 | |
| 498 | virtual MaybeObject* AddElementsToFixedArray(Object* receiver, |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 499 | JSObject* holder, |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 500 | FixedArray* to, |
| 501 | FixedArrayBase* from) { |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 502 | int len0 = to->length(); |
| 503 | #ifdef DEBUG |
| 504 | if (FLAG_enable_slow_asserts) { |
| 505 | for (int i = 0; i < len0; i++) { |
| 506 | ASSERT(!to->get(i)->IsTheHole()); |
| 507 | } |
| 508 | } |
| 509 | #endif |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 510 | if (from == NULL) { |
| 511 | from = holder->elements(); |
| 512 | } |
| 513 | BackingStore* backing_store = BackingStore::cast(from); |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 514 | uint32_t len1 = ElementsAccessorSubclass::GetCapacityImpl(backing_store); |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 515 | |
| 516 | // Optimize if 'other' is empty. |
| 517 | // We cannot optimize if 'this' is empty, as other may have holes. |
| 518 | if (len1 == 0) return to; |
| 519 | |
| 520 | // Compute how many elements are not in other. |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 521 | uint32_t extra = 0; |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 522 | for (uint32_t y = 0; y < len1; y++) { |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 523 | uint32_t key = |
| 524 | ElementsAccessorSubclass::GetKeyForIndexImpl(backing_store, y); |
| 525 | if (ElementsAccessorSubclass::HasElementImpl( |
| 526 | receiver, holder, key, backing_store)) { |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 527 | MaybeObject* maybe_value = |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 528 | ElementsAccessorSubclass::GetImpl(receiver, holder, |
| 529 | key, backing_store); |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 530 | Object* value; |
| 531 | if (!maybe_value->ToObject(&value)) return maybe_value; |
| 532 | ASSERT(!value->IsTheHole()); |
| 533 | if (!HasKey(to, value)) { |
| 534 | extra++; |
| 535 | } |
| 536 | } |
| 537 | } |
| 538 | |
| 539 | if (extra == 0) return to; |
| 540 | |
| 541 | // Allocate the result |
| 542 | FixedArray* result; |
| 543 | MaybeObject* maybe_obj = |
| 544 | backing_store->GetHeap()->AllocateFixedArray(len0 + extra); |
| 545 | if (!maybe_obj->To<FixedArray>(&result)) return maybe_obj; |
| 546 | |
| 547 | // Fill in the content |
| 548 | { |
| 549 | AssertNoAllocation no_gc; |
| 550 | WriteBarrierMode mode = result->GetWriteBarrierMode(no_gc); |
| 551 | for (int i = 0; i < len0; i++) { |
| 552 | Object* e = to->get(i); |
| 553 | ASSERT(e->IsString() || e->IsNumber()); |
| 554 | result->set(i, e, mode); |
| 555 | } |
| 556 | } |
| 557 | // Fill in the extra values. |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 558 | uint32_t index = 0; |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 559 | for (uint32_t y = 0; y < len1; y++) { |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 560 | uint32_t key = |
| 561 | ElementsAccessorSubclass::GetKeyForIndexImpl(backing_store, y); |
| 562 | if (ElementsAccessorSubclass::HasElementImpl( |
| 563 | receiver, holder, key, backing_store)) { |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 564 | MaybeObject* maybe_value = |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 565 | ElementsAccessorSubclass::GetImpl(receiver, holder, |
| 566 | key, backing_store); |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 567 | Object* value; |
| 568 | if (!maybe_value->ToObject(&value)) return maybe_value; |
| 569 | if (!value->IsTheHole() && !HasKey(to, value)) { |
| 570 | result->set(len0 + index, value); |
| 571 | index++; |
| 572 | } |
| 573 | } |
| 574 | } |
| 575 | ASSERT(extra == index); |
| 576 | return result; |
| 577 | } |
| 578 | |
| 579 | protected: |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 580 | static uint32_t GetCapacityImpl(BackingStore* backing_store) { |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 581 | return backing_store->length(); |
| 582 | } |
| 583 | |
| 584 | virtual uint32_t GetCapacity(FixedArrayBase* backing_store) { |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 585 | return ElementsAccessorSubclass::GetCapacityImpl( |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 586 | BackingStore::cast(backing_store)); |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 587 | } |
| 588 | |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 589 | static uint32_t GetKeyForIndexImpl(BackingStore* backing_store, |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 590 | uint32_t index) { |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 591 | return index; |
| 592 | } |
| 593 | |
| 594 | virtual uint32_t GetKeyForIndex(FixedArrayBase* backing_store, |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 595 | uint32_t index) { |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 596 | return ElementsAccessorSubclass::GetKeyForIndexImpl( |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 597 | BackingStore::cast(backing_store), index); |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 598 | } |
| 599 | |
| 600 | private: |
| 601 | DISALLOW_COPY_AND_ASSIGN(ElementsAccessorBase); |
| 602 | }; |
| 603 | |
| 604 | |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 605 | // Super class for all fast element arrays. |
| 606 | template<typename FastElementsAccessorSubclass, |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 607 | typename KindTraits, |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 608 | int ElementSize> |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 609 | class FastElementsAccessor |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 610 | : public ElementsAccessorBase<FastElementsAccessorSubclass, KindTraits> { |
| 611 | public: |
| 612 | explicit FastElementsAccessor(const char* name) |
| 613 | : ElementsAccessorBase<FastElementsAccessorSubclass, |
| 614 | KindTraits>(name) {} |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 615 | protected: |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 616 | friend class ElementsAccessorBase<FastElementsAccessorSubclass, KindTraits>; |
| 617 | |
| 618 | typedef typename KindTraits::BackingStore BackingStore; |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 619 | |
| 620 | // Adjusts the length of the fast backing store or returns the new length or |
| 621 | // undefined in case conversion to a slow backing store should be performed. |
| 622 | static MaybeObject* SetLengthWithoutNormalize(BackingStore* backing_store, |
| 623 | JSArray* array, |
| 624 | Object* length_object, |
| 625 | uint32_t length) { |
| 626 | uint32_t old_capacity = backing_store->length(); |
| 627 | |
| 628 | // Check whether the backing store should be shrunk. |
| 629 | if (length <= old_capacity) { |
| 630 | if (array->HasFastTypeElements()) { |
| 631 | MaybeObject* maybe_obj = array->EnsureWritableFastElements(); |
| 632 | if (!maybe_obj->To(&backing_store)) return maybe_obj; |
| 633 | } |
| 634 | if (2 * length <= old_capacity) { |
| 635 | // If more than half the elements won't be used, trim the array. |
| 636 | if (length == 0) { |
| 637 | array->initialize_elements(); |
| 638 | } else { |
| 639 | backing_store->set_length(length); |
| 640 | Address filler_start = backing_store->address() + |
| 641 | BackingStore::OffsetOfElementAt(length); |
| 642 | int filler_size = (old_capacity - length) * ElementSize; |
| 643 | array->GetHeap()->CreateFillerObjectAt(filler_start, filler_size); |
| 644 | } |
| 645 | } else { |
| 646 | // Otherwise, fill the unused tail with holes. |
| 647 | int old_length = FastD2I(array->length()->Number()); |
| 648 | for (int i = length; i < old_length; i++) { |
| 649 | backing_store->set_the_hole(i); |
| 650 | } |
| 651 | } |
| 652 | return length_object; |
| 653 | } |
| 654 | |
| 655 | // Check whether the backing store should be expanded. |
| 656 | uint32_t min = JSObject::NewElementsCapacity(old_capacity); |
| 657 | uint32_t new_capacity = length > min ? length : min; |
| 658 | if (!array->ShouldConvertToSlowElements(new_capacity)) { |
| 659 | MaybeObject* result = FastElementsAccessorSubclass:: |
| 660 | SetFastElementsCapacityAndLength(array, new_capacity, length); |
| 661 | if (result->IsFailure()) return result; |
| 662 | return length_object; |
| 663 | } |
| 664 | |
| 665 | // Request conversion to slow elements. |
| 666 | return array->GetHeap()->undefined_value(); |
| 667 | } |
| 668 | }; |
| 669 | |
| 670 | |
| 671 | class FastObjectElementsAccessor |
| 672 | : public FastElementsAccessor<FastObjectElementsAccessor, |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 673 | ElementsKindTraits<FAST_ELEMENTS>, |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 674 | kPointerSize> { |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 675 | public: |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 676 | explicit FastObjectElementsAccessor(const char* name) |
| 677 | : FastElementsAccessor<FastObjectElementsAccessor, |
| 678 | ElementsKindTraits<FAST_ELEMENTS>, |
| 679 | kPointerSize>(name) {} |
| 680 | |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 681 | static MaybeObject* DeleteCommon(JSObject* obj, |
| 682 | uint32_t key) { |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 683 | ASSERT(obj->HasFastElements() || |
| 684 | obj->HasFastSmiOnlyElements() || |
| 685 | obj->HasFastArgumentsElements()); |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 686 | Heap* heap = obj->GetHeap(); |
| 687 | FixedArray* backing_store = FixedArray::cast(obj->elements()); |
| 688 | if (backing_store->map() == heap->non_strict_arguments_elements_map()) { |
| 689 | backing_store = FixedArray::cast(backing_store->get(1)); |
| 690 | } else { |
| 691 | Object* writable; |
| 692 | MaybeObject* maybe = obj->EnsureWritableFastElements(); |
| 693 | if (!maybe->ToObject(&writable)) return maybe; |
| 694 | backing_store = FixedArray::cast(writable); |
| 695 | } |
| 696 | uint32_t length = static_cast<uint32_t>( |
| 697 | obj->IsJSArray() |
| 698 | ? Smi::cast(JSArray::cast(obj)->length())->value() |
| 699 | : backing_store->length()); |
| 700 | if (key < length) { |
| 701 | backing_store->set_the_hole(key); |
| 702 | // If an old space backing store is larger than a certain size and |
| 703 | // has too few used values, normalize it. |
| 704 | // To avoid doing the check on every delete we require at least |
| 705 | // one adjacent hole to the value being deleted. |
| 706 | Object* hole = heap->the_hole_value(); |
| 707 | const int kMinLengthForSparsenessCheck = 64; |
| 708 | if (backing_store->length() >= kMinLengthForSparsenessCheck && |
| 709 | !heap->InNewSpace(backing_store) && |
| 710 | ((key > 0 && backing_store->get(key - 1) == hole) || |
| 711 | (key + 1 < length && backing_store->get(key + 1) == hole))) { |
| 712 | int num_used = 0; |
| 713 | for (int i = 0; i < backing_store->length(); ++i) { |
| 714 | if (backing_store->get(i) != hole) ++num_used; |
| 715 | // Bail out early if more than 1/4 is used. |
| 716 | if (4 * num_used > backing_store->length()) break; |
| 717 | } |
| 718 | if (4 * num_used <= backing_store->length()) { |
| 719 | MaybeObject* result = obj->NormalizeElements(); |
| 720 | if (result->IsFailure()) return result; |
| 721 | } |
| 722 | } |
| 723 | } |
| 724 | return heap->true_value(); |
| 725 | } |
| 726 | |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 727 | static MaybeObject* CopyElementsImpl(FixedArrayBase* from, |
| 728 | uint32_t from_start, |
| 729 | FixedArrayBase* to, |
| 730 | ElementsKind to_kind, |
| 731 | uint32_t to_start, |
| 732 | int copy_size) { |
| 733 | switch (to_kind) { |
| 734 | case FAST_SMI_ONLY_ELEMENTS: |
| 735 | case FAST_ELEMENTS: { |
| 736 | CopyObjectToObjectElements( |
| 737 | FixedArray::cast(from), ElementsTraits::Kind, from_start, |
| 738 | FixedArray::cast(to), to_kind, to_start, copy_size); |
| 739 | return from; |
| 740 | } |
| 741 | case FAST_DOUBLE_ELEMENTS: |
| 742 | CopyObjectToDoubleElements( |
| 743 | FixedArray::cast(from), from_start, |
| 744 | FixedDoubleArray::cast(to), to_start, copy_size); |
| 745 | return from; |
| 746 | default: |
| 747 | UNREACHABLE(); |
| 748 | } |
| 749 | return to->GetHeap()->undefined_value(); |
| 750 | } |
| 751 | |
| 752 | |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 753 | static MaybeObject* SetFastElementsCapacityAndLength(JSObject* obj, |
| 754 | uint32_t capacity, |
| 755 | uint32_t length) { |
| 756 | JSObject::SetFastElementsCapacityMode set_capacity_mode = |
| 757 | obj->HasFastSmiOnlyElements() |
| 758 | ? JSObject::kAllowSmiOnlyElements |
| 759 | : JSObject::kDontAllowSmiOnlyElements; |
| 760 | return obj->SetFastElementsCapacityAndLength(capacity, |
| 761 | length, |
| 762 | set_capacity_mode); |
| 763 | } |
| 764 | |
Ben Murdoch | c7cc028 | 2012-03-05 14:35:55 +0000 | [diff] [blame] | 765 | protected: |
| 766 | friend class FastElementsAccessor<FastObjectElementsAccessor, |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 767 | ElementsKindTraits<FAST_ELEMENTS>, |
Ben Murdoch | c7cc028 | 2012-03-05 14:35:55 +0000 | [diff] [blame] | 768 | kPointerSize>; |
| 769 | |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 770 | virtual MaybeObject* Delete(JSObject* obj, |
| 771 | uint32_t key, |
| 772 | JSReceiver::DeleteMode mode) { |
| 773 | return DeleteCommon(obj, key); |
| 774 | } |
| 775 | }; |
| 776 | |
| 777 | |
| 778 | class FastDoubleElementsAccessor |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 779 | : public FastElementsAccessor<FastDoubleElementsAccessor, |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 780 | ElementsKindTraits<FAST_DOUBLE_ELEMENTS>, |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 781 | kDoubleSize> { |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 782 | public: |
| 783 | explicit FastDoubleElementsAccessor(const char* name) |
| 784 | : FastElementsAccessor<FastDoubleElementsAccessor, |
| 785 | ElementsKindTraits<FAST_DOUBLE_ELEMENTS>, |
| 786 | kDoubleSize>(name) {} |
| 787 | |
Ben Murdoch | c7cc028 | 2012-03-05 14:35:55 +0000 | [diff] [blame] | 788 | static MaybeObject* SetFastElementsCapacityAndLength(JSObject* obj, |
| 789 | uint32_t capacity, |
| 790 | uint32_t length) { |
| 791 | return obj->SetFastDoubleElementsCapacityAndLength(capacity, length); |
| 792 | } |
| 793 | |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 794 | protected: |
| 795 | friend class ElementsAccessorBase<FastDoubleElementsAccessor, |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 796 | ElementsKindTraits<FAST_DOUBLE_ELEMENTS> >; |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 797 | friend class FastElementsAccessor<FastDoubleElementsAccessor, |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 798 | ElementsKindTraits<FAST_DOUBLE_ELEMENTS>, |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 799 | kDoubleSize>; |
| 800 | |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 801 | static MaybeObject* CopyElementsImpl(FixedArrayBase* from, |
| 802 | uint32_t from_start, |
| 803 | FixedArrayBase* to, |
| 804 | ElementsKind to_kind, |
| 805 | uint32_t to_start, |
| 806 | int copy_size) { |
| 807 | switch (to_kind) { |
| 808 | case FAST_SMI_ONLY_ELEMENTS: |
| 809 | case FAST_ELEMENTS: |
| 810 | return CopyDoubleToObjectElements( |
| 811 | FixedDoubleArray::cast(from), from_start, FixedArray::cast(to), |
| 812 | to_kind, to_start, copy_size); |
| 813 | case FAST_DOUBLE_ELEMENTS: |
| 814 | CopyDoubleToDoubleElements(FixedDoubleArray::cast(from), from_start, |
| 815 | FixedDoubleArray::cast(to), |
| 816 | to_start, copy_size); |
| 817 | return from; |
| 818 | default: |
| 819 | UNREACHABLE(); |
| 820 | } |
| 821 | return to->GetHeap()->undefined_value(); |
| 822 | } |
| 823 | |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 824 | virtual MaybeObject* Delete(JSObject* obj, |
| 825 | uint32_t key, |
| 826 | JSReceiver::DeleteMode mode) { |
| 827 | int length = obj->IsJSArray() |
| 828 | ? Smi::cast(JSArray::cast(obj)->length())->value() |
| 829 | : FixedDoubleArray::cast(obj->elements())->length(); |
| 830 | if (key < static_cast<uint32_t>(length)) { |
| 831 | FixedDoubleArray::cast(obj->elements())->set_the_hole(key); |
| 832 | } |
| 833 | return obj->GetHeap()->true_value(); |
| 834 | } |
| 835 | |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 836 | static bool HasElementImpl(Object* receiver, |
| 837 | JSObject* holder, |
| 838 | uint32_t key, |
| 839 | FixedDoubleArray* backing_store) { |
| 840 | return key < static_cast<uint32_t>(backing_store->length()) && |
| 841 | !backing_store->is_the_hole(key); |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 842 | } |
| 843 | }; |
| 844 | |
| 845 | |
| 846 | // Super class for all external element arrays. |
| 847 | template<typename ExternalElementsAccessorSubclass, |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 848 | ElementsKind Kind> |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 849 | class ExternalElementsAccessor |
| 850 | : public ElementsAccessorBase<ExternalElementsAccessorSubclass, |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 851 | ElementsKindTraits<Kind> > { |
| 852 | public: |
| 853 | explicit ExternalElementsAccessor(const char* name) |
| 854 | : ElementsAccessorBase<ExternalElementsAccessorSubclass, |
| 855 | ElementsKindTraits<Kind> >(name) {} |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 856 | |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 857 | protected: |
| 858 | typedef typename ElementsKindTraits<Kind>::BackingStore BackingStore; |
| 859 | |
| 860 | friend class ElementsAccessorBase<ExternalElementsAccessorSubclass, |
| 861 | ElementsKindTraits<Kind> >; |
| 862 | |
| 863 | static MaybeObject* GetImpl(Object* receiver, |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 864 | JSObject* obj, |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 865 | uint32_t key, |
| 866 | BackingStore* backing_store) { |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 867 | return |
| 868 | key < ExternalElementsAccessorSubclass::GetCapacityImpl(backing_store) |
| 869 | ? backing_store->get(key) |
| 870 | : backing_store->GetHeap()->undefined_value(); |
| 871 | } |
| 872 | |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 873 | static MaybeObject* SetLengthImpl(JSObject* obj, |
| 874 | Object* length, |
| 875 | BackingStore* backing_store) { |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 876 | // External arrays do not support changing their length. |
| 877 | UNREACHABLE(); |
| 878 | return obj; |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 879 | } |
| 880 | |
| 881 | virtual MaybeObject* Delete(JSObject* obj, |
| 882 | uint32_t key, |
| 883 | JSReceiver::DeleteMode mode) { |
| 884 | // External arrays always ignore deletes. |
| 885 | return obj->GetHeap()->true_value(); |
| 886 | } |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 887 | |
| 888 | static bool HasElementImpl(Object* receiver, |
| 889 | JSObject* holder, |
| 890 | uint32_t key, |
| 891 | BackingStore* backing_store) { |
| 892 | uint32_t capacity = |
| 893 | ExternalElementsAccessorSubclass::GetCapacityImpl(backing_store); |
| 894 | return key < capacity; |
| 895 | } |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 896 | }; |
| 897 | |
| 898 | |
| 899 | class ExternalByteElementsAccessor |
| 900 | : public ExternalElementsAccessor<ExternalByteElementsAccessor, |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 901 | EXTERNAL_BYTE_ELEMENTS> { |
| 902 | public: |
| 903 | explicit ExternalByteElementsAccessor(const char* name) |
| 904 | : ExternalElementsAccessor<ExternalByteElementsAccessor, |
| 905 | EXTERNAL_BYTE_ELEMENTS>(name) {} |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 906 | }; |
| 907 | |
| 908 | |
| 909 | class ExternalUnsignedByteElementsAccessor |
| 910 | : public ExternalElementsAccessor<ExternalUnsignedByteElementsAccessor, |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 911 | EXTERNAL_UNSIGNED_BYTE_ELEMENTS> { |
| 912 | public: |
| 913 | explicit ExternalUnsignedByteElementsAccessor(const char* name) |
| 914 | : ExternalElementsAccessor<ExternalUnsignedByteElementsAccessor, |
| 915 | EXTERNAL_UNSIGNED_BYTE_ELEMENTS>(name) {} |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 916 | }; |
| 917 | |
| 918 | |
| 919 | class ExternalShortElementsAccessor |
| 920 | : public ExternalElementsAccessor<ExternalShortElementsAccessor, |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 921 | EXTERNAL_SHORT_ELEMENTS> { |
| 922 | public: |
| 923 | explicit ExternalShortElementsAccessor(const char* name) |
| 924 | : ExternalElementsAccessor<ExternalShortElementsAccessor, |
| 925 | EXTERNAL_SHORT_ELEMENTS>(name) {} |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 926 | }; |
| 927 | |
| 928 | |
| 929 | class ExternalUnsignedShortElementsAccessor |
| 930 | : public ExternalElementsAccessor<ExternalUnsignedShortElementsAccessor, |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 931 | EXTERNAL_UNSIGNED_SHORT_ELEMENTS> { |
| 932 | public: |
| 933 | explicit ExternalUnsignedShortElementsAccessor(const char* name) |
| 934 | : ExternalElementsAccessor<ExternalUnsignedShortElementsAccessor, |
| 935 | EXTERNAL_UNSIGNED_SHORT_ELEMENTS>(name) {} |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 936 | }; |
| 937 | |
| 938 | |
| 939 | class ExternalIntElementsAccessor |
| 940 | : public ExternalElementsAccessor<ExternalIntElementsAccessor, |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 941 | EXTERNAL_INT_ELEMENTS> { |
| 942 | public: |
| 943 | explicit ExternalIntElementsAccessor(const char* name) |
| 944 | : ExternalElementsAccessor<ExternalIntElementsAccessor, |
| 945 | EXTERNAL_INT_ELEMENTS>(name) {} |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 946 | }; |
| 947 | |
| 948 | |
| 949 | class ExternalUnsignedIntElementsAccessor |
| 950 | : public ExternalElementsAccessor<ExternalUnsignedIntElementsAccessor, |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 951 | EXTERNAL_UNSIGNED_INT_ELEMENTS> { |
| 952 | public: |
| 953 | explicit ExternalUnsignedIntElementsAccessor(const char* name) |
| 954 | : ExternalElementsAccessor<ExternalUnsignedIntElementsAccessor, |
| 955 | EXTERNAL_UNSIGNED_INT_ELEMENTS>(name) {} |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 956 | }; |
| 957 | |
| 958 | |
| 959 | class ExternalFloatElementsAccessor |
| 960 | : public ExternalElementsAccessor<ExternalFloatElementsAccessor, |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 961 | EXTERNAL_FLOAT_ELEMENTS> { |
| 962 | public: |
| 963 | explicit ExternalFloatElementsAccessor(const char* name) |
| 964 | : ExternalElementsAccessor<ExternalFloatElementsAccessor, |
| 965 | EXTERNAL_FLOAT_ELEMENTS>(name) {} |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 966 | }; |
| 967 | |
| 968 | |
| 969 | class ExternalDoubleElementsAccessor |
| 970 | : public ExternalElementsAccessor<ExternalDoubleElementsAccessor, |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 971 | EXTERNAL_DOUBLE_ELEMENTS> { |
| 972 | public: |
| 973 | explicit ExternalDoubleElementsAccessor(const char* name) |
| 974 | : ExternalElementsAccessor<ExternalDoubleElementsAccessor, |
| 975 | EXTERNAL_DOUBLE_ELEMENTS>(name) {} |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 976 | }; |
| 977 | |
| 978 | |
| 979 | class PixelElementsAccessor |
| 980 | : public ExternalElementsAccessor<PixelElementsAccessor, |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 981 | EXTERNAL_PIXEL_ELEMENTS> { |
| 982 | public: |
| 983 | explicit PixelElementsAccessor(const char* name) |
| 984 | : ExternalElementsAccessor<PixelElementsAccessor, |
| 985 | EXTERNAL_PIXEL_ELEMENTS>(name) {} |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 986 | }; |
| 987 | |
| 988 | |
| 989 | class DictionaryElementsAccessor |
| 990 | : public ElementsAccessorBase<DictionaryElementsAccessor, |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 991 | ElementsKindTraits<DICTIONARY_ELEMENTS> > { |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 992 | public: |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 993 | explicit DictionaryElementsAccessor(const char* name) |
| 994 | : ElementsAccessorBase<DictionaryElementsAccessor, |
| 995 | ElementsKindTraits<DICTIONARY_ELEMENTS> >(name) {} |
| 996 | |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 997 | // Adjusts the length of the dictionary backing store and returns the new |
| 998 | // length according to ES5 section 15.4.5.2 behavior. |
Ben Murdoch | c7cc028 | 2012-03-05 14:35:55 +0000 | [diff] [blame] | 999 | static MaybeObject* SetLengthWithoutNormalize(SeededNumberDictionary* dict, |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 1000 | JSArray* array, |
| 1001 | Object* length_object, |
| 1002 | uint32_t length) { |
| 1003 | if (length == 0) { |
| 1004 | // If the length of a slow array is reset to zero, we clear |
| 1005 | // the array and flush backing storage. This has the added |
| 1006 | // benefit that the array returns to fast mode. |
| 1007 | Object* obj; |
| 1008 | MaybeObject* maybe_obj = array->ResetElements(); |
| 1009 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 1010 | } else { |
| 1011 | uint32_t new_length = length; |
| 1012 | uint32_t old_length = static_cast<uint32_t>(array->length()->Number()); |
| 1013 | if (new_length < old_length) { |
| 1014 | // Find last non-deletable element in range of elements to be |
| 1015 | // deleted and adjust range accordingly. |
| 1016 | Heap* heap = array->GetHeap(); |
| 1017 | int capacity = dict->Capacity(); |
| 1018 | for (int i = 0; i < capacity; i++) { |
| 1019 | Object* key = dict->KeyAt(i); |
| 1020 | if (key->IsNumber()) { |
| 1021 | uint32_t number = static_cast<uint32_t>(key->Number()); |
| 1022 | if (new_length <= number && number < old_length) { |
| 1023 | PropertyDetails details = dict->DetailsAt(i); |
| 1024 | if (details.IsDontDelete()) new_length = number + 1; |
| 1025 | } |
| 1026 | } |
| 1027 | } |
| 1028 | if (new_length != length) { |
| 1029 | MaybeObject* maybe_object = heap->NumberFromUint32(new_length); |
| 1030 | if (!maybe_object->To(&length_object)) return maybe_object; |
| 1031 | } |
| 1032 | |
| 1033 | // Remove elements that should be deleted. |
| 1034 | int removed_entries = 0; |
| 1035 | Object* the_hole_value = heap->the_hole_value(); |
| 1036 | for (int i = 0; i < capacity; i++) { |
| 1037 | Object* key = dict->KeyAt(i); |
| 1038 | if (key->IsNumber()) { |
| 1039 | uint32_t number = static_cast<uint32_t>(key->Number()); |
| 1040 | if (new_length <= number && number < old_length) { |
| 1041 | dict->SetEntry(i, the_hole_value, the_hole_value); |
| 1042 | removed_entries++; |
| 1043 | } |
| 1044 | } |
| 1045 | } |
| 1046 | |
| 1047 | // Update the number of elements. |
| 1048 | dict->ElementsRemoved(removed_entries); |
| 1049 | } |
| 1050 | } |
| 1051 | return length_object; |
| 1052 | } |
| 1053 | |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1054 | static MaybeObject* DeleteCommon(JSObject* obj, |
| 1055 | uint32_t key, |
| 1056 | JSReceiver::DeleteMode mode) { |
| 1057 | Isolate* isolate = obj->GetIsolate(); |
| 1058 | Heap* heap = isolate->heap(); |
| 1059 | FixedArray* backing_store = FixedArray::cast(obj->elements()); |
| 1060 | bool is_arguments = |
Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame] | 1061 | (obj->GetElementsKind() == NON_STRICT_ARGUMENTS_ELEMENTS); |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1062 | if (is_arguments) { |
| 1063 | backing_store = FixedArray::cast(backing_store->get(1)); |
| 1064 | } |
Ben Murdoch | c7cc028 | 2012-03-05 14:35:55 +0000 | [diff] [blame] | 1065 | SeededNumberDictionary* dictionary = |
| 1066 | SeededNumberDictionary::cast(backing_store); |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1067 | int entry = dictionary->FindEntry(key); |
Ben Murdoch | c7cc028 | 2012-03-05 14:35:55 +0000 | [diff] [blame] | 1068 | if (entry != SeededNumberDictionary::kNotFound) { |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1069 | Object* result = dictionary->DeleteProperty(entry, mode); |
| 1070 | if (result == heap->true_value()) { |
| 1071 | MaybeObject* maybe_elements = dictionary->Shrink(key); |
| 1072 | FixedArray* new_elements = NULL; |
| 1073 | if (!maybe_elements->To(&new_elements)) { |
| 1074 | return maybe_elements; |
| 1075 | } |
| 1076 | if (is_arguments) { |
| 1077 | FixedArray::cast(obj->elements())->set(1, new_elements); |
| 1078 | } else { |
| 1079 | obj->set_elements(new_elements); |
| 1080 | } |
| 1081 | } |
| 1082 | if (mode == JSObject::STRICT_DELETION && |
| 1083 | result == heap->false_value()) { |
| 1084 | // In strict mode, attempting to delete a non-configurable property |
| 1085 | // throws an exception. |
| 1086 | HandleScope scope(isolate); |
| 1087 | Handle<Object> holder(obj); |
| 1088 | Handle<Object> name = isolate->factory()->NewNumberFromUint(key); |
| 1089 | Handle<Object> args[2] = { name, holder }; |
| 1090 | Handle<Object> error = |
| 1091 | isolate->factory()->NewTypeError("strict_delete_property", |
| 1092 | HandleVector(args, 2)); |
| 1093 | return isolate->Throw(*error); |
| 1094 | } |
| 1095 | } |
| 1096 | return heap->true_value(); |
| 1097 | } |
| 1098 | |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 1099 | static MaybeObject* CopyElementsImpl(FixedArrayBase* from, |
| 1100 | uint32_t from_start, |
| 1101 | FixedArrayBase* to, |
| 1102 | ElementsKind to_kind, |
| 1103 | uint32_t to_start, |
| 1104 | int copy_size) { |
| 1105 | switch (to_kind) { |
| 1106 | case FAST_SMI_ONLY_ELEMENTS: |
| 1107 | case FAST_ELEMENTS: |
| 1108 | CopyDictionaryToObjectElements( |
| 1109 | SeededNumberDictionary::cast(from), from_start, |
| 1110 | FixedArray::cast(to), to_kind, to_start, copy_size); |
| 1111 | return from; |
| 1112 | case FAST_DOUBLE_ELEMENTS: |
| 1113 | CopyDictionaryToDoubleElements( |
| 1114 | SeededNumberDictionary::cast(from), from_start, |
| 1115 | FixedDoubleArray::cast(to), to_start, copy_size); |
| 1116 | return from; |
| 1117 | default: |
| 1118 | UNREACHABLE(); |
| 1119 | } |
| 1120 | return to->GetHeap()->undefined_value(); |
| 1121 | } |
| 1122 | |
| 1123 | |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1124 | protected: |
| 1125 | friend class ElementsAccessorBase<DictionaryElementsAccessor, |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 1126 | ElementsKindTraits<DICTIONARY_ELEMENTS> >; |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1127 | |
| 1128 | virtual MaybeObject* Delete(JSObject* obj, |
| 1129 | uint32_t key, |
| 1130 | JSReceiver::DeleteMode mode) { |
| 1131 | return DeleteCommon(obj, key, mode); |
| 1132 | } |
| 1133 | |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 1134 | static MaybeObject* GetImpl(Object* receiver, |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 1135 | JSObject* obj, |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 1136 | uint32_t key, |
| 1137 | SeededNumberDictionary* backing_store) { |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1138 | int entry = backing_store->FindEntry(key); |
Ben Murdoch | c7cc028 | 2012-03-05 14:35:55 +0000 | [diff] [blame] | 1139 | if (entry != SeededNumberDictionary::kNotFound) { |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1140 | Object* element = backing_store->ValueAt(entry); |
| 1141 | PropertyDetails details = backing_store->DetailsAt(entry); |
| 1142 | if (details.type() == CALLBACKS) { |
| 1143 | return obj->GetElementWithCallback(receiver, |
| 1144 | element, |
| 1145 | key, |
| 1146 | obj); |
| 1147 | } else { |
| 1148 | return element; |
| 1149 | } |
| 1150 | } |
| 1151 | return obj->GetHeap()->the_hole_value(); |
| 1152 | } |
| 1153 | |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 1154 | static bool HasElementImpl(Object* receiver, |
| 1155 | JSObject* holder, |
| 1156 | uint32_t key, |
| 1157 | SeededNumberDictionary* backing_store) { |
| 1158 | return backing_store->FindEntry(key) != |
| 1159 | SeededNumberDictionary::kNotFound; |
| 1160 | } |
| 1161 | |
Ben Murdoch | c7cc028 | 2012-03-05 14:35:55 +0000 | [diff] [blame] | 1162 | static uint32_t GetKeyForIndexImpl(SeededNumberDictionary* dict, |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 1163 | uint32_t index) { |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1164 | Object* key = dict->KeyAt(index); |
| 1165 | return Smi::cast(key)->value(); |
| 1166 | } |
| 1167 | }; |
| 1168 | |
| 1169 | |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 1170 | class NonStrictArgumentsElementsAccessor : public ElementsAccessorBase< |
| 1171 | NonStrictArgumentsElementsAccessor, |
| 1172 | ElementsKindTraits<NON_STRICT_ARGUMENTS_ELEMENTS> > { |
| 1173 | public: |
| 1174 | explicit NonStrictArgumentsElementsAccessor(const char* name) |
| 1175 | : ElementsAccessorBase< |
| 1176 | NonStrictArgumentsElementsAccessor, |
| 1177 | ElementsKindTraits<NON_STRICT_ARGUMENTS_ELEMENTS> >(name) {} |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1178 | protected: |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 1179 | friend class ElementsAccessorBase< |
| 1180 | NonStrictArgumentsElementsAccessor, |
| 1181 | ElementsKindTraits<NON_STRICT_ARGUMENTS_ELEMENTS> >; |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1182 | |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 1183 | static MaybeObject* GetImpl(Object* receiver, |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 1184 | JSObject* obj, |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 1185 | uint32_t key, |
| 1186 | FixedArray* parameter_map) { |
| 1187 | Object* probe = GetParameterMapArg(obj, parameter_map, key); |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1188 | if (!probe->IsTheHole()) { |
| 1189 | Context* context = Context::cast(parameter_map->get(0)); |
| 1190 | int context_index = Smi::cast(probe)->value(); |
| 1191 | ASSERT(!context->get(context_index)->IsTheHole()); |
| 1192 | return context->get(context_index); |
| 1193 | } else { |
| 1194 | // Object is not mapped, defer to the arguments. |
| 1195 | FixedArray* arguments = FixedArray::cast(parameter_map->get(1)); |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 1196 | MaybeObject* maybe_result = ElementsAccessor::ForArray(arguments)->Get( |
| 1197 | receiver, obj, key, arguments); |
| 1198 | Object* result; |
| 1199 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 1200 | // Elements of the arguments object in slow mode might be slow aliases. |
| 1201 | if (result->IsAliasedArgumentsEntry()) { |
| 1202 | AliasedArgumentsEntry* entry = AliasedArgumentsEntry::cast(result); |
| 1203 | Context* context = Context::cast(parameter_map->get(0)); |
| 1204 | int context_index = entry->aliased_context_slot(); |
| 1205 | ASSERT(!context->get(context_index)->IsTheHole()); |
| 1206 | return context->get(context_index); |
| 1207 | } else { |
| 1208 | return result; |
| 1209 | } |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1210 | } |
| 1211 | } |
| 1212 | |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 1213 | static MaybeObject* SetLengthImpl(JSObject* obj, |
| 1214 | Object* length, |
| 1215 | FixedArray* parameter_map) { |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 1216 | // TODO(mstarzinger): This was never implemented but will be used once we |
| 1217 | // correctly implement [[DefineOwnProperty]] on arrays. |
| 1218 | UNIMPLEMENTED(); |
| 1219 | return obj; |
| 1220 | } |
| 1221 | |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1222 | virtual MaybeObject* Delete(JSObject* obj, |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 1223 | uint32_t key, |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1224 | JSReceiver::DeleteMode mode) { |
| 1225 | FixedArray* parameter_map = FixedArray::cast(obj->elements()); |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 1226 | Object* probe = GetParameterMapArg(obj, parameter_map, key); |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1227 | if (!probe->IsTheHole()) { |
| 1228 | // TODO(kmillikin): We could check if this was the last aliased |
| 1229 | // parameter, and revert to normal elements in that case. That |
| 1230 | // would enable GC of the context. |
| 1231 | parameter_map->set_the_hole(key + 2); |
| 1232 | } else { |
| 1233 | FixedArray* arguments = FixedArray::cast(parameter_map->get(1)); |
| 1234 | if (arguments->IsDictionary()) { |
| 1235 | return DictionaryElementsAccessor::DeleteCommon(obj, key, mode); |
| 1236 | } else { |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 1237 | return FastObjectElementsAccessor::DeleteCommon(obj, key); |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1238 | } |
| 1239 | } |
| 1240 | return obj->GetHeap()->true_value(); |
| 1241 | } |
| 1242 | |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 1243 | static MaybeObject* CopyElementsImpl(FixedArrayBase* from, |
| 1244 | uint32_t from_start, |
| 1245 | FixedArrayBase* to, |
| 1246 | ElementsKind to_kind, |
| 1247 | uint32_t to_start, |
| 1248 | int copy_size) { |
| 1249 | FixedArray* parameter_map = FixedArray::cast(from); |
| 1250 | FixedArray* arguments = FixedArray::cast(parameter_map->get(1)); |
| 1251 | ElementsAccessor* accessor = ElementsAccessor::ForArray(arguments); |
| 1252 | return accessor->CopyElements(NULL, from_start, to, to_kind, |
| 1253 | to_start, copy_size, arguments); |
| 1254 | } |
| 1255 | |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 1256 | static uint32_t GetCapacityImpl(FixedArray* parameter_map) { |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1257 | FixedArrayBase* arguments = FixedArrayBase::cast(parameter_map->get(1)); |
| 1258 | return Max(static_cast<uint32_t>(parameter_map->length() - 2), |
| 1259 | ForArray(arguments)->GetCapacity(arguments)); |
| 1260 | } |
| 1261 | |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 1262 | static uint32_t GetKeyForIndexImpl(FixedArray* dict, |
| 1263 | uint32_t index) { |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1264 | return index; |
| 1265 | } |
| 1266 | |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 1267 | static bool HasElementImpl(Object* receiver, |
| 1268 | JSObject* holder, |
| 1269 | uint32_t key, |
| 1270 | FixedArray* parameter_map) { |
| 1271 | Object* probe = GetParameterMapArg(holder, parameter_map, key); |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1272 | if (!probe->IsTheHole()) { |
| 1273 | return true; |
| 1274 | } else { |
| 1275 | FixedArrayBase* arguments = FixedArrayBase::cast(parameter_map->get(1)); |
| 1276 | ElementsAccessor* accessor = ElementsAccessor::ForArray(arguments); |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 1277 | return !accessor->Get(receiver, holder, key, arguments)->IsTheHole(); |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1278 | } |
| 1279 | } |
| 1280 | |
| 1281 | private: |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 1282 | static Object* GetParameterMapArg(JSObject* holder, |
| 1283 | FixedArray* parameter_map, |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1284 | uint32_t key) { |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 1285 | uint32_t length = holder->IsJSArray() |
| 1286 | ? Smi::cast(JSArray::cast(holder)->length())->value() |
| 1287 | : parameter_map->length(); |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1288 | return key < (length - 2 ) |
| 1289 | ? parameter_map->get(key + 2) |
| 1290 | : parameter_map->GetHeap()->the_hole_value(); |
| 1291 | } |
| 1292 | }; |
| 1293 | |
| 1294 | |
| 1295 | ElementsAccessor* ElementsAccessor::ForArray(FixedArrayBase* array) { |
| 1296 | switch (array->map()->instance_type()) { |
| 1297 | case FIXED_ARRAY_TYPE: |
| 1298 | if (array->IsDictionary()) { |
Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame] | 1299 | return elements_accessors_[DICTIONARY_ELEMENTS]; |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1300 | } else { |
Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame] | 1301 | return elements_accessors_[FAST_ELEMENTS]; |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1302 | } |
| 1303 | case EXTERNAL_BYTE_ARRAY_TYPE: |
Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame] | 1304 | return elements_accessors_[EXTERNAL_BYTE_ELEMENTS]; |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1305 | case EXTERNAL_UNSIGNED_BYTE_ARRAY_TYPE: |
Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame] | 1306 | return elements_accessors_[EXTERNAL_UNSIGNED_BYTE_ELEMENTS]; |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1307 | case EXTERNAL_SHORT_ARRAY_TYPE: |
Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame] | 1308 | return elements_accessors_[EXTERNAL_SHORT_ELEMENTS]; |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1309 | case EXTERNAL_UNSIGNED_SHORT_ARRAY_TYPE: |
Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame] | 1310 | return elements_accessors_[EXTERNAL_UNSIGNED_SHORT_ELEMENTS]; |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1311 | case EXTERNAL_INT_ARRAY_TYPE: |
Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame] | 1312 | return elements_accessors_[EXTERNAL_INT_ELEMENTS]; |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1313 | case EXTERNAL_UNSIGNED_INT_ARRAY_TYPE: |
Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame] | 1314 | return elements_accessors_[EXTERNAL_UNSIGNED_INT_ELEMENTS]; |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1315 | case EXTERNAL_FLOAT_ARRAY_TYPE: |
Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame] | 1316 | return elements_accessors_[EXTERNAL_FLOAT_ELEMENTS]; |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1317 | case EXTERNAL_DOUBLE_ARRAY_TYPE: |
Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame] | 1318 | return elements_accessors_[EXTERNAL_DOUBLE_ELEMENTS]; |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1319 | case EXTERNAL_PIXEL_ARRAY_TYPE: |
Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame] | 1320 | return elements_accessors_[EXTERNAL_PIXEL_ELEMENTS]; |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1321 | default: |
| 1322 | UNREACHABLE(); |
| 1323 | return NULL; |
| 1324 | } |
| 1325 | } |
| 1326 | |
| 1327 | |
| 1328 | void ElementsAccessor::InitializeOncePerProcess() { |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 1329 | static struct ConcreteElementsAccessors { |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 1330 | #define ACCESSOR_STRUCT(Class, Kind, Store) Class* Kind##_handler; |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 1331 | ELEMENTS_LIST(ACCESSOR_STRUCT) |
| 1332 | #undef ACCESSOR_STRUCT |
| 1333 | } element_accessors = { |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 1334 | #define ACCESSOR_INIT(Class, Kind, Store) new Class(#Kind), |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 1335 | ELEMENTS_LIST(ACCESSOR_INIT) |
| 1336 | #undef ACCESSOR_INIT |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1337 | }; |
| 1338 | |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 1339 | static ElementsAccessor* accessor_array[] = { |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 1340 | #define ACCESSOR_ARRAY(Class, Kind, Store) element_accessors.Kind##_handler, |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 1341 | ELEMENTS_LIST(ACCESSOR_ARRAY) |
| 1342 | #undef ACCESSOR_ARRAY |
| 1343 | }; |
| 1344 | |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 1345 | STATIC_ASSERT((sizeof(accessor_array) / sizeof(*accessor_array)) == |
| 1346 | kElementsKindCount); |
| 1347 | |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1348 | elements_accessors_ = accessor_array; |
| 1349 | } |
| 1350 | |
| 1351 | |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 1352 | template <typename ElementsAccessorSubclass, typename ElementsKindTraits> |
| 1353 | MaybeObject* ElementsAccessorBase<ElementsAccessorSubclass, |
| 1354 | ElementsKindTraits>:: |
| 1355 | SetLengthImpl(JSObject* obj, |
| 1356 | Object* length, |
| 1357 | typename ElementsKindTraits::BackingStore* backing_store) { |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 1358 | JSArray* array = JSArray::cast(obj); |
| 1359 | |
| 1360 | // Fast case: The new length fits into a Smi. |
| 1361 | MaybeObject* maybe_smi_length = length->ToSmi(); |
| 1362 | Object* smi_length = Smi::FromInt(0); |
| 1363 | if (maybe_smi_length->ToObject(&smi_length) && smi_length->IsSmi()) { |
| 1364 | const int value = Smi::cast(smi_length)->value(); |
| 1365 | if (value >= 0) { |
| 1366 | Object* new_length; |
| 1367 | MaybeObject* result = ElementsAccessorSubclass:: |
| 1368 | SetLengthWithoutNormalize(backing_store, array, smi_length, value); |
| 1369 | if (!result->ToObject(&new_length)) return result; |
| 1370 | ASSERT(new_length->IsSmi() || new_length->IsUndefined()); |
| 1371 | if (new_length->IsSmi()) { |
| 1372 | array->set_length(Smi::cast(new_length)); |
| 1373 | return array; |
| 1374 | } |
| 1375 | } else { |
| 1376 | return ThrowArrayLengthRangeError(array->GetHeap()); |
| 1377 | } |
| 1378 | } |
| 1379 | |
| 1380 | // Slow case: The new length does not fit into a Smi or conversion |
| 1381 | // to slow elements is needed for other reasons. |
| 1382 | if (length->IsNumber()) { |
| 1383 | uint32_t value; |
| 1384 | if (length->ToArrayIndex(&value)) { |
Ben Murdoch | c7cc028 | 2012-03-05 14:35:55 +0000 | [diff] [blame] | 1385 | SeededNumberDictionary* dictionary; |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 1386 | MaybeObject* maybe_object = array->NormalizeElements(); |
| 1387 | if (!maybe_object->To(&dictionary)) return maybe_object; |
| 1388 | Object* new_length; |
| 1389 | MaybeObject* result = DictionaryElementsAccessor:: |
| 1390 | SetLengthWithoutNormalize(dictionary, array, length, value); |
| 1391 | if (!result->ToObject(&new_length)) return result; |
| 1392 | ASSERT(new_length->IsNumber()); |
| 1393 | array->set_length(new_length); |
| 1394 | return array; |
| 1395 | } else { |
| 1396 | return ThrowArrayLengthRangeError(array->GetHeap()); |
| 1397 | } |
| 1398 | } |
| 1399 | |
| 1400 | // Fall-back case: The new length is not a number so make the array |
| 1401 | // size one and set only element to length. |
| 1402 | FixedArray* new_backing_store; |
| 1403 | MaybeObject* maybe_obj = array->GetHeap()->AllocateFixedArray(1); |
| 1404 | if (!maybe_obj->To(&new_backing_store)) return maybe_obj; |
| 1405 | new_backing_store->set(0, length); |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame^] | 1406 | { MaybeObject* result = array->SetContent(new_backing_store); |
| 1407 | if (result->IsFailure()) return result; |
| 1408 | } |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 1409 | return array; |
| 1410 | } |
| 1411 | |
| 1412 | |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1413 | } } // namespace v8::internal |