Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1 | // Copyright 2006-2009 the V8 project authors. All rights reserved. |
| 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 "accessors.h" |
| 31 | #include "api.h" |
| 32 | #include "arguments.h" |
| 33 | #include "execution.h" |
| 34 | #include "ic-inl.h" |
| 35 | #include "runtime.h" |
| 36 | #include "stub-cache.h" |
| 37 | |
| 38 | namespace v8 { |
| 39 | namespace internal { |
| 40 | |
| 41 | #ifdef DEBUG |
| 42 | static char TransitionMarkFromState(IC::State state) { |
| 43 | switch (state) { |
| 44 | case UNINITIALIZED: return '0'; |
| 45 | case PREMONOMORPHIC: return 'P'; |
| 46 | case MONOMORPHIC: return '1'; |
| 47 | case MONOMORPHIC_PROTOTYPE_FAILURE: return '^'; |
| 48 | case MEGAMORPHIC: return 'N'; |
| 49 | |
| 50 | // We never see the debugger states here, because the state is |
| 51 | // computed from the original code - not the patched code. Let |
| 52 | // these cases fall through to the unreachable code below. |
| 53 | case DEBUG_BREAK: break; |
| 54 | case DEBUG_PREPARE_STEP_IN: break; |
| 55 | } |
| 56 | UNREACHABLE(); |
| 57 | return 0; |
| 58 | } |
| 59 | |
| 60 | void IC::TraceIC(const char* type, |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 61 | Handle<Object> name, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 62 | State old_state, |
| 63 | Code* new_target, |
| 64 | const char* extra_info) { |
| 65 | if (FLAG_trace_ic) { |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 66 | State new_state = StateFrom(new_target, |
| 67 | Heap::undefined_value(), |
| 68 | Heap::undefined_value()); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 69 | PrintF("[%s (%c->%c)%s", type, |
| 70 | TransitionMarkFromState(old_state), |
| 71 | TransitionMarkFromState(new_state), |
| 72 | extra_info); |
| 73 | name->Print(); |
| 74 | PrintF("]\n"); |
| 75 | } |
| 76 | } |
| 77 | #endif |
| 78 | |
| 79 | |
| 80 | IC::IC(FrameDepth depth) { |
| 81 | // To improve the performance of the (much used) IC code, we unfold |
| 82 | // a few levels of the stack frame iteration code. This yields a |
| 83 | // ~35% speedup when running DeltaBlue with the '--nouse-ic' flag. |
| 84 | const Address entry = Top::c_entry_fp(Top::GetCurrentThread()); |
| 85 | Address* pc_address = |
| 86 | reinterpret_cast<Address*>(entry + ExitFrameConstants::kCallerPCOffset); |
| 87 | Address fp = Memory::Address_at(entry + ExitFrameConstants::kCallerFPOffset); |
| 88 | // If there's another JavaScript frame on the stack, we need to look |
| 89 | // one frame further down the stack to find the frame pointer and |
| 90 | // the return address stack slot. |
| 91 | if (depth == EXTRA_CALL_FRAME) { |
| 92 | const int kCallerPCOffset = StandardFrameConstants::kCallerPCOffset; |
| 93 | pc_address = reinterpret_cast<Address*>(fp + kCallerPCOffset); |
| 94 | fp = Memory::Address_at(fp + StandardFrameConstants::kCallerFPOffset); |
| 95 | } |
| 96 | #ifdef DEBUG |
| 97 | StackFrameIterator it; |
| 98 | for (int i = 0; i < depth + 1; i++) it.Advance(); |
| 99 | StackFrame* frame = it.frame(); |
| 100 | ASSERT(fp == frame->fp() && pc_address == frame->pc_address()); |
| 101 | #endif |
| 102 | fp_ = fp; |
| 103 | pc_address_ = pc_address; |
| 104 | } |
| 105 | |
| 106 | |
| 107 | #ifdef ENABLE_DEBUGGER_SUPPORT |
| 108 | Address IC::OriginalCodeAddress() { |
| 109 | HandleScope scope; |
| 110 | // Compute the JavaScript frame for the frame pointer of this IC |
| 111 | // structure. We need this to be able to find the function |
| 112 | // corresponding to the frame. |
| 113 | StackFrameIterator it; |
| 114 | while (it.frame()->fp() != this->fp()) it.Advance(); |
| 115 | JavaScriptFrame* frame = JavaScriptFrame::cast(it.frame()); |
| 116 | // Find the function on the stack and both the active code for the |
| 117 | // function and the original code. |
| 118 | JSFunction* function = JSFunction::cast(frame->function()); |
| 119 | Handle<SharedFunctionInfo> shared(function->shared()); |
| 120 | Code* code = shared->code(); |
| 121 | ASSERT(Debug::HasDebugInfo(shared)); |
| 122 | Code* original_code = Debug::GetDebugInfo(shared)->original_code(); |
| 123 | ASSERT(original_code->IsCode()); |
| 124 | // Get the address of the call site in the active code. This is the |
| 125 | // place where the call to DebugBreakXXX is and where the IC |
| 126 | // normally would be. |
| 127 | Address addr = pc() - Assembler::kCallTargetAddressOffset; |
| 128 | // Return the address in the original code. This is the place where |
| 129 | // the call which has been overwritten by the DebugBreakXXX resides |
| 130 | // and the place where the inline cache system should look. |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 131 | intptr_t delta = |
| 132 | original_code->instruction_start() - code->instruction_start(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 133 | return addr + delta; |
| 134 | } |
| 135 | #endif |
| 136 | |
Steve Block | 8defd9f | 2010-07-08 12:39:36 +0100 | [diff] [blame] | 137 | |
| 138 | static bool HasNormalObjectsInPrototypeChain(LookupResult* lookup, |
| 139 | Object* receiver) { |
| 140 | Object* end = lookup->IsProperty() ? lookup->holder() : Heap::null_value(); |
| 141 | for (Object* current = receiver; |
| 142 | current != end; |
| 143 | current = current->GetPrototype()) { |
| 144 | if (current->IsJSObject() && |
| 145 | !JSObject::cast(current)->HasFastProperties() && |
| 146 | !current->IsJSGlobalProxy() && |
| 147 | !current->IsJSGlobalObject()) { |
| 148 | return true; |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | return false; |
| 153 | } |
| 154 | |
| 155 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 156 | IC::State IC::StateFrom(Code* target, Object* receiver, Object* name) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 157 | IC::State state = target->ic_state(); |
| 158 | |
| 159 | if (state != MONOMORPHIC) return state; |
| 160 | if (receiver->IsUndefined() || receiver->IsNull()) return state; |
| 161 | |
Steve Block | 8defd9f | 2010-07-08 12:39:36 +0100 | [diff] [blame] | 162 | InlineCacheHolderFlag cache_holder = |
| 163 | Code::ExtractCacheHolderFromFlags(target->flags()); |
| 164 | |
| 165 | |
| 166 | if (cache_holder == OWN_MAP && !receiver->IsJSObject()) { |
| 167 | // The stub was generated for JSObject but called for non-JSObject. |
| 168 | // IC::GetCodeCacheMap is not applicable. |
| 169 | return MONOMORPHIC; |
| 170 | } else if (cache_holder == PROTOTYPE_MAP && |
| 171 | receiver->GetPrototype()->IsNull()) { |
| 172 | // IC::GetCodeCacheMap is not applicable. |
| 173 | return MONOMORPHIC; |
| 174 | } |
| 175 | Map* map = IC::GetCodeCacheMap(receiver, cache_holder); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 176 | |
| 177 | // Decide whether the inline cache failed because of changes to the |
| 178 | // receiver itself or changes to one of its prototypes. |
| 179 | // |
| 180 | // If there are changes to the receiver itself, the map of the |
| 181 | // receiver will have changed and the current target will not be in |
| 182 | // the receiver map's code cache. Therefore, if the current target |
| 183 | // is in the receiver map's code cache, the inline cache failed due |
| 184 | // to prototype check failure. |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 185 | int index = map->IndexInCodeCache(name, target); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 186 | if (index >= 0) { |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 187 | // For keyed load/store/call, the most likely cause of cache failure is |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 188 | // that the key has changed. We do not distinguish between |
| 189 | // prototype and non-prototype failures for keyed access. |
| 190 | Code::Kind kind = target->kind(); |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 191 | if (kind == Code::KEYED_LOAD_IC || |
| 192 | kind == Code::KEYED_STORE_IC || |
| 193 | kind == Code::KEYED_CALL_IC) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 194 | return MONOMORPHIC; |
| 195 | } |
| 196 | |
| 197 | // Remove the target from the code cache to avoid hitting the same |
| 198 | // invalid stub again. |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 199 | map->RemoveFromCodeCache(String::cast(name), target, index); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 200 | |
| 201 | return MONOMORPHIC_PROTOTYPE_FAILURE; |
| 202 | } |
| 203 | |
| 204 | // The builtins object is special. It only changes when JavaScript |
| 205 | // builtins are loaded lazily. It is important to keep inline |
| 206 | // caches for the builtins object monomorphic. Therefore, if we get |
| 207 | // an inline cache miss for the builtins object after lazily loading |
| 208 | // JavaScript builtins, we return uninitialized as the state to |
| 209 | // force the inline cache back to monomorphic state. |
| 210 | if (receiver->IsJSBuiltinsObject()) { |
| 211 | return UNINITIALIZED; |
| 212 | } |
| 213 | |
| 214 | return MONOMORPHIC; |
| 215 | } |
| 216 | |
| 217 | |
| 218 | RelocInfo::Mode IC::ComputeMode() { |
| 219 | Address addr = address(); |
| 220 | Code* code = Code::cast(Heap::FindCodeObject(addr)); |
| 221 | for (RelocIterator it(code, RelocInfo::kCodeTargetMask); |
| 222 | !it.done(); it.next()) { |
| 223 | RelocInfo* info = it.rinfo(); |
| 224 | if (info->pc() == addr) return info->rmode(); |
| 225 | } |
| 226 | UNREACHABLE(); |
| 227 | return RelocInfo::NONE; |
| 228 | } |
| 229 | |
| 230 | |
| 231 | Failure* IC::TypeError(const char* type, |
| 232 | Handle<Object> object, |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 233 | Handle<Object> key) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 234 | HandleScope scope; |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 235 | Handle<Object> args[2] = { key, object }; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 236 | Handle<Object> error = Factory::NewTypeError(type, HandleVector(args, 2)); |
| 237 | return Top::Throw(*error); |
| 238 | } |
| 239 | |
| 240 | |
| 241 | Failure* IC::ReferenceError(const char* type, Handle<String> name) { |
| 242 | HandleScope scope; |
| 243 | Handle<Object> error = |
| 244 | Factory::NewReferenceError(type, HandleVector(&name, 1)); |
| 245 | return Top::Throw(*error); |
| 246 | } |
| 247 | |
| 248 | |
| 249 | void IC::Clear(Address address) { |
| 250 | Code* target = GetTargetAtAddress(address); |
| 251 | |
| 252 | // Don't clear debug break inline cache as it will remove the break point. |
| 253 | if (target->ic_state() == DEBUG_BREAK) return; |
| 254 | |
| 255 | switch (target->kind()) { |
| 256 | case Code::LOAD_IC: return LoadIC::Clear(address, target); |
| 257 | case Code::KEYED_LOAD_IC: return KeyedLoadIC::Clear(address, target); |
| 258 | case Code::STORE_IC: return StoreIC::Clear(address, target); |
| 259 | case Code::KEYED_STORE_IC: return KeyedStoreIC::Clear(address, target); |
| 260 | case Code::CALL_IC: return CallIC::Clear(address, target); |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 261 | case Code::KEYED_CALL_IC: return KeyedCallIC::Clear(address, target); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 262 | case Code::BINARY_OP_IC: return; // Clearing these is tricky and does not |
| 263 | // make any performance difference. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 264 | default: UNREACHABLE(); |
| 265 | } |
| 266 | } |
| 267 | |
| 268 | |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 269 | void CallICBase::Clear(Address address, Code* target) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 270 | State state = target->ic_state(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 271 | if (state == UNINITIALIZED) return; |
| 272 | Code* code = |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 273 | StubCache::FindCallInitialize(target->arguments_count(), |
| 274 | target->ic_in_loop(), |
| 275 | target->kind()); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 276 | SetTargetAtAddress(address, code); |
| 277 | } |
| 278 | |
| 279 | |
Kristian Monsen | 50ef84f | 2010-07-29 15:18:00 +0100 | [diff] [blame^] | 280 | void KeyedLoadIC::ClearInlinedVersion(Address address) { |
| 281 | // Insert null as the map to check for to make sure the map check fails |
| 282 | // sending control flow to the IC instead of the inlined version. |
| 283 | PatchInlinedLoad(address, Heap::null_value()); |
| 284 | } |
| 285 | |
| 286 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 287 | void KeyedLoadIC::Clear(Address address, Code* target) { |
| 288 | if (target->ic_state() == UNINITIALIZED) return; |
| 289 | // Make sure to also clear the map used in inline fast cases. If we |
| 290 | // do not clear these maps, cached code can keep objects alive |
| 291 | // through the embedded maps. |
| 292 | ClearInlinedVersion(address); |
| 293 | SetTargetAtAddress(address, initialize_stub()); |
| 294 | } |
| 295 | |
| 296 | |
Kristian Monsen | 50ef84f | 2010-07-29 15:18:00 +0100 | [diff] [blame^] | 297 | void LoadIC::ClearInlinedVersion(Address address) { |
| 298 | // Reset the map check of the inlined inobject property load (if |
| 299 | // present) to guarantee failure by holding an invalid map (the null |
| 300 | // value). The offset can be patched to anything. |
| 301 | PatchInlinedLoad(address, Heap::null_value(), 0); |
| 302 | } |
| 303 | |
| 304 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 305 | void LoadIC::Clear(Address address, Code* target) { |
| 306 | if (target->ic_state() == UNINITIALIZED) return; |
| 307 | ClearInlinedVersion(address); |
| 308 | SetTargetAtAddress(address, initialize_stub()); |
| 309 | } |
| 310 | |
| 311 | |
Kristian Monsen | 50ef84f | 2010-07-29 15:18:00 +0100 | [diff] [blame^] | 312 | void StoreIC::ClearInlinedVersion(Address address) { |
| 313 | // Reset the map check of the inlined inobject property store (if |
| 314 | // present) to guarantee failure by holding an invalid map (the null |
| 315 | // value). The offset can be patched to anything. |
| 316 | PatchInlinedStore(address, Heap::null_value(), 0); |
| 317 | } |
| 318 | |
| 319 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 320 | void StoreIC::Clear(Address address, Code* target) { |
| 321 | if (target->ic_state() == UNINITIALIZED) return; |
Kristian Monsen | 50ef84f | 2010-07-29 15:18:00 +0100 | [diff] [blame^] | 322 | ClearInlinedVersion(address); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 323 | SetTargetAtAddress(address, initialize_stub()); |
| 324 | } |
| 325 | |
| 326 | |
Kristian Monsen | 50ef84f | 2010-07-29 15:18:00 +0100 | [diff] [blame^] | 327 | void KeyedStoreIC::ClearInlinedVersion(Address address) { |
| 328 | // Insert null as the elements map to check for. This will make |
| 329 | // sure that the elements fast-case map check fails so that control |
| 330 | // flows to the IC instead of the inlined version. |
| 331 | PatchInlinedStore(address, Heap::null_value()); |
| 332 | } |
| 333 | |
| 334 | |
| 335 | void KeyedStoreIC::RestoreInlinedVersion(Address address) { |
| 336 | // Restore the fast-case elements map check so that the inlined |
| 337 | // version can be used again. |
| 338 | PatchInlinedStore(address, Heap::fixed_array_map()); |
| 339 | } |
| 340 | |
| 341 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 342 | void KeyedStoreIC::Clear(Address address, Code* target) { |
| 343 | if (target->ic_state() == UNINITIALIZED) return; |
| 344 | SetTargetAtAddress(address, initialize_stub()); |
| 345 | } |
| 346 | |
| 347 | |
Steve Block | 3ce2e20 | 2009-11-05 08:53:23 +0000 | [diff] [blame] | 348 | Code* KeyedLoadIC::external_array_stub(JSObject::ElementsKind elements_kind) { |
| 349 | switch (elements_kind) { |
| 350 | case JSObject::EXTERNAL_BYTE_ELEMENTS: |
| 351 | return Builtins::builtin(Builtins::KeyedLoadIC_ExternalByteArray); |
| 352 | case JSObject::EXTERNAL_UNSIGNED_BYTE_ELEMENTS: |
| 353 | return Builtins::builtin(Builtins::KeyedLoadIC_ExternalUnsignedByteArray); |
| 354 | case JSObject::EXTERNAL_SHORT_ELEMENTS: |
| 355 | return Builtins::builtin(Builtins::KeyedLoadIC_ExternalShortArray); |
| 356 | case JSObject::EXTERNAL_UNSIGNED_SHORT_ELEMENTS: |
| 357 | return Builtins::builtin( |
| 358 | Builtins::KeyedLoadIC_ExternalUnsignedShortArray); |
| 359 | case JSObject::EXTERNAL_INT_ELEMENTS: |
| 360 | return Builtins::builtin(Builtins::KeyedLoadIC_ExternalIntArray); |
| 361 | case JSObject::EXTERNAL_UNSIGNED_INT_ELEMENTS: |
| 362 | return Builtins::builtin(Builtins::KeyedLoadIC_ExternalUnsignedIntArray); |
| 363 | case JSObject::EXTERNAL_FLOAT_ELEMENTS: |
| 364 | return Builtins::builtin(Builtins::KeyedLoadIC_ExternalFloatArray); |
| 365 | default: |
| 366 | UNREACHABLE(); |
| 367 | return NULL; |
| 368 | } |
| 369 | } |
| 370 | |
| 371 | |
| 372 | Code* KeyedStoreIC::external_array_stub(JSObject::ElementsKind elements_kind) { |
| 373 | switch (elements_kind) { |
| 374 | case JSObject::EXTERNAL_BYTE_ELEMENTS: |
| 375 | return Builtins::builtin(Builtins::KeyedStoreIC_ExternalByteArray); |
| 376 | case JSObject::EXTERNAL_UNSIGNED_BYTE_ELEMENTS: |
| 377 | return Builtins::builtin( |
| 378 | Builtins::KeyedStoreIC_ExternalUnsignedByteArray); |
| 379 | case JSObject::EXTERNAL_SHORT_ELEMENTS: |
| 380 | return Builtins::builtin(Builtins::KeyedStoreIC_ExternalShortArray); |
| 381 | case JSObject::EXTERNAL_UNSIGNED_SHORT_ELEMENTS: |
| 382 | return Builtins::builtin( |
| 383 | Builtins::KeyedStoreIC_ExternalUnsignedShortArray); |
| 384 | case JSObject::EXTERNAL_INT_ELEMENTS: |
| 385 | return Builtins::builtin(Builtins::KeyedStoreIC_ExternalIntArray); |
| 386 | case JSObject::EXTERNAL_UNSIGNED_INT_ELEMENTS: |
| 387 | return Builtins::builtin(Builtins::KeyedStoreIC_ExternalUnsignedIntArray); |
| 388 | case JSObject::EXTERNAL_FLOAT_ELEMENTS: |
| 389 | return Builtins::builtin(Builtins::KeyedStoreIC_ExternalFloatArray); |
| 390 | default: |
| 391 | UNREACHABLE(); |
| 392 | return NULL; |
| 393 | } |
| 394 | } |
| 395 | |
| 396 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 397 | static bool HasInterceptorGetter(JSObject* object) { |
| 398 | return !object->GetNamedInterceptor()->getter()->IsUndefined(); |
| 399 | } |
| 400 | |
| 401 | |
| 402 | static void LookupForRead(Object* object, |
| 403 | String* name, |
| 404 | LookupResult* lookup) { |
| 405 | AssertNoAllocation no_gc; // pointers must stay valid |
| 406 | |
| 407 | // Skip all the objects with named interceptors, but |
| 408 | // without actual getter. |
| 409 | while (true) { |
| 410 | object->Lookup(name, lookup); |
| 411 | // Besides normal conditions (property not found or it's not |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 412 | // an interceptor), bail out if lookup is not cacheable: we won't |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 413 | // be able to IC it anyway and regular lookup should work fine. |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 414 | if (!lookup->IsFound() |
| 415 | || (lookup->type() != INTERCEPTOR) |
| 416 | || !lookup->IsCacheable()) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 417 | return; |
| 418 | } |
| 419 | |
| 420 | JSObject* holder = lookup->holder(); |
| 421 | if (HasInterceptorGetter(holder)) { |
| 422 | return; |
| 423 | } |
| 424 | |
| 425 | holder->LocalLookupRealNamedProperty(name, lookup); |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 426 | if (lookup->IsProperty()) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 427 | ASSERT(lookup->type() != INTERCEPTOR); |
| 428 | return; |
| 429 | } |
| 430 | |
| 431 | Object* proto = holder->GetPrototype(); |
| 432 | if (proto->IsNull()) { |
| 433 | lookup->NotFound(); |
| 434 | return; |
| 435 | } |
| 436 | |
| 437 | object = proto; |
| 438 | } |
| 439 | } |
| 440 | |
| 441 | |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 442 | Object* CallICBase::TryCallAsFunction(Object* object) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 443 | HandleScope scope; |
| 444 | Handle<Object> target(object); |
| 445 | Handle<Object> delegate = Execution::GetFunctionDelegate(target); |
| 446 | |
| 447 | if (delegate->IsJSFunction()) { |
| 448 | // Patch the receiver and use the delegate as the function to |
| 449 | // invoke. This is used for invoking objects as if they were |
| 450 | // functions. |
| 451 | const int argc = this->target()->arguments_count(); |
| 452 | StackFrameLocator locator; |
| 453 | JavaScriptFrame* frame = locator.FindJavaScriptFrame(0); |
| 454 | int index = frame->ComputeExpressionsCount() - (argc + 1); |
| 455 | frame->SetExpression(index, *target); |
| 456 | } |
| 457 | |
| 458 | return *delegate; |
| 459 | } |
| 460 | |
Kristian Monsen | 9dcf7e2 | 2010-06-28 14:14:28 +0100 | [diff] [blame] | 461 | |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 462 | void CallICBase::ReceiverToObject(Handle<Object> object) { |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 463 | HandleScope scope; |
| 464 | Handle<Object> receiver(object); |
| 465 | |
| 466 | // Change the receiver to the result of calling ToObject on it. |
| 467 | const int argc = this->target()->arguments_count(); |
| 468 | StackFrameLocator locator; |
| 469 | JavaScriptFrame* frame = locator.FindJavaScriptFrame(0); |
| 470 | int index = frame->ComputeExpressionsCount() - (argc + 1); |
| 471 | frame->SetExpression(index, *Factory::ToObject(object)); |
| 472 | } |
| 473 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 474 | |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 475 | Object* CallICBase::LoadFunction(State state, |
| 476 | Handle<Object> object, |
| 477 | Handle<String> name) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 478 | // If the object is undefined or null it's illegal to try to get any |
| 479 | // of its properties; throw a TypeError in that case. |
| 480 | if (object->IsUndefined() || object->IsNull()) { |
| 481 | return TypeError("non_object_property_call", object, name); |
| 482 | } |
| 483 | |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 484 | if (object->IsString() || object->IsNumber() || object->IsBoolean()) { |
| 485 | ReceiverToObject(object); |
| 486 | } |
| 487 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 488 | // Check if the name is trivially convertible to an index and get |
| 489 | // the element if so. |
| 490 | uint32_t index; |
| 491 | if (name->AsArrayIndex(&index)) { |
| 492 | Object* result = object->GetElement(index); |
| 493 | if (result->IsJSFunction()) return result; |
| 494 | |
| 495 | // Try to find a suitable function delegate for the object at hand. |
| 496 | result = TryCallAsFunction(result); |
| 497 | if (result->IsJSFunction()) return result; |
| 498 | |
| 499 | // Otherwise, it will fail in the lookup step. |
| 500 | } |
| 501 | |
| 502 | // Lookup the property in the object. |
| 503 | LookupResult lookup; |
| 504 | LookupForRead(*object, *name, &lookup); |
| 505 | |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 506 | if (!lookup.IsProperty()) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 507 | // If the object does not have the requested property, check which |
| 508 | // exception we need to throw. |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 509 | if (IsContextual(object)) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 510 | return ReferenceError("not_defined", name); |
| 511 | } |
| 512 | return TypeError("undefined_method", object, name); |
| 513 | } |
| 514 | |
| 515 | // Lookup is valid: Update inline cache and stub cache. |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 516 | if (FLAG_use_ic) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 517 | UpdateCaches(&lookup, state, object, name); |
| 518 | } |
| 519 | |
| 520 | // Get the property. |
| 521 | PropertyAttributes attr; |
| 522 | Object* result = object->GetProperty(*object, &lookup, *name, &attr); |
| 523 | if (result->IsFailure()) return result; |
| 524 | if (lookup.type() == INTERCEPTOR) { |
| 525 | // If the object does not have the requested property, check which |
| 526 | // exception we need to throw. |
| 527 | if (attr == ABSENT) { |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 528 | if (IsContextual(object)) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 529 | return ReferenceError("not_defined", name); |
| 530 | } |
| 531 | return TypeError("undefined_method", object, name); |
| 532 | } |
| 533 | } |
| 534 | |
| 535 | ASSERT(result != Heap::the_hole_value()); |
| 536 | |
| 537 | if (result->IsJSFunction()) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 538 | #ifdef ENABLE_DEBUGGER_SUPPORT |
| 539 | // Handle stepping into a function if step into is active. |
| 540 | if (Debug::StepInActive()) { |
| 541 | // Protect the result in a handle as the debugger can allocate and might |
| 542 | // cause GC. |
| 543 | HandleScope scope; |
| 544 | Handle<JSFunction> function(JSFunction::cast(result)); |
| 545 | Debug::HandleStepIn(function, object, fp(), false); |
| 546 | return *function; |
| 547 | } |
| 548 | #endif |
| 549 | |
| 550 | return result; |
| 551 | } |
| 552 | |
| 553 | // Try to find a suitable function delegate for the object at hand. |
| 554 | result = TryCallAsFunction(result); |
| 555 | return result->IsJSFunction() ? |
| 556 | result : TypeError("property_not_function", object, name); |
| 557 | } |
| 558 | |
| 559 | |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 560 | void CallICBase::UpdateCaches(LookupResult* lookup, |
Steve Block | 8defd9f | 2010-07-08 12:39:36 +0100 | [diff] [blame] | 561 | State state, |
| 562 | Handle<Object> object, |
| 563 | Handle<String> name) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 564 | // Bail out if we didn't find a result. |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 565 | if (!lookup->IsProperty() || !lookup->IsCacheable()) return; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 566 | |
Steve Block | 8defd9f | 2010-07-08 12:39:36 +0100 | [diff] [blame] | 567 | if (lookup->holder() != *object && |
| 568 | HasNormalObjectsInPrototypeChain(lookup, object->GetPrototype())) { |
| 569 | // Suppress optimization for prototype chains with slow properties objects |
| 570 | // in the middle. |
| 571 | return; |
| 572 | } |
Steve Block | 8defd9f | 2010-07-08 12:39:36 +0100 | [diff] [blame] | 573 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 574 | // Compute the number of arguments. |
| 575 | int argc = target()->arguments_count(); |
| 576 | InLoopFlag in_loop = target()->ic_in_loop(); |
| 577 | Object* code = NULL; |
| 578 | |
| 579 | if (state == UNINITIALIZED) { |
| 580 | // This is the first time we execute this inline cache. |
| 581 | // Set the target to the pre monomorphic stub to delay |
| 582 | // setting the monomorphic state. |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 583 | code = StubCache::ComputeCallPreMonomorphic(argc, in_loop, kind_); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 584 | } else if (state == MONOMORPHIC) { |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 585 | code = StubCache::ComputeCallMegamorphic(argc, in_loop, kind_); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 586 | } else { |
| 587 | // Compute monomorphic stub. |
| 588 | switch (lookup->type()) { |
| 589 | case FIELD: { |
| 590 | int index = lookup->GetFieldIndex(); |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 591 | code = StubCache::ComputeCallField(argc, |
| 592 | in_loop, |
| 593 | kind_, |
| 594 | *name, |
| 595 | *object, |
| 596 | lookup->holder(), |
| 597 | index); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 598 | break; |
| 599 | } |
| 600 | case CONSTANT_FUNCTION: { |
| 601 | // Get the constant function and compute the code stub for this |
| 602 | // call; used for rewriting to monomorphic state and making sure |
| 603 | // that the code stub is in the stub cache. |
| 604 | JSFunction* function = lookup->GetConstantFunction(); |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 605 | code = StubCache::ComputeCallConstant(argc, |
| 606 | in_loop, |
| 607 | kind_, |
| 608 | *name, |
| 609 | *object, |
| 610 | lookup->holder(), |
| 611 | function); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 612 | break; |
| 613 | } |
| 614 | case NORMAL: { |
| 615 | if (!object->IsJSObject()) return; |
| 616 | Handle<JSObject> receiver = Handle<JSObject>::cast(object); |
| 617 | |
| 618 | if (lookup->holder()->IsGlobalObject()) { |
| 619 | GlobalObject* global = GlobalObject::cast(lookup->holder()); |
| 620 | JSGlobalPropertyCell* cell = |
| 621 | JSGlobalPropertyCell::cast(global->GetPropertyCell(lookup)); |
| 622 | if (!cell->value()->IsJSFunction()) return; |
| 623 | JSFunction* function = JSFunction::cast(cell->value()); |
| 624 | code = StubCache::ComputeCallGlobal(argc, |
| 625 | in_loop, |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 626 | kind_, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 627 | *name, |
| 628 | *receiver, |
| 629 | global, |
| 630 | cell, |
| 631 | function); |
| 632 | } else { |
| 633 | // There is only one shared stub for calling normalized |
| 634 | // properties. It does not traverse the prototype chain, so the |
| 635 | // property must be found in the receiver for the stub to be |
| 636 | // applicable. |
| 637 | if (lookup->holder() != *receiver) return; |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 638 | code = StubCache::ComputeCallNormal(argc, |
| 639 | in_loop, |
| 640 | kind_, |
| 641 | *name, |
| 642 | *receiver); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 643 | } |
| 644 | break; |
| 645 | } |
| 646 | case INTERCEPTOR: { |
| 647 | ASSERT(HasInterceptorGetter(lookup->holder())); |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 648 | code = StubCache::ComputeCallInterceptor(argc, |
| 649 | kind_, |
| 650 | *name, |
| 651 | *object, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 652 | lookup->holder()); |
| 653 | break; |
| 654 | } |
| 655 | default: |
| 656 | return; |
| 657 | } |
| 658 | } |
| 659 | |
| 660 | // If we're unable to compute the stub (not enough memory left), we |
| 661 | // simply avoid updating the caches. |
| 662 | if (code == NULL || code->IsFailure()) return; |
| 663 | |
| 664 | // Patch the call site depending on the state of the cache. |
| 665 | if (state == UNINITIALIZED || |
| 666 | state == PREMONOMORPHIC || |
| 667 | state == MONOMORPHIC || |
| 668 | state == MONOMORPHIC_PROTOTYPE_FAILURE) { |
| 669 | set_target(Code::cast(code)); |
Kristian Monsen | 9dcf7e2 | 2010-06-28 14:14:28 +0100 | [diff] [blame] | 670 | } else if (state == MEGAMORPHIC) { |
Steve Block | 8defd9f | 2010-07-08 12:39:36 +0100 | [diff] [blame] | 671 | // Cache code holding map should be consistent with |
| 672 | // GenerateMonomorphicCacheProbe. It is not the map which holds the stub. |
| 673 | Map* map = JSObject::cast(object->IsJSObject() ? *object : |
| 674 | object->GetPrototype())->map(); |
| 675 | |
Kristian Monsen | 9dcf7e2 | 2010-06-28 14:14:28 +0100 | [diff] [blame] | 676 | // Update the stub cache. |
Steve Block | 8defd9f | 2010-07-08 12:39:36 +0100 | [diff] [blame] | 677 | StubCache::Set(*name, map, Code::cast(code)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 678 | } |
| 679 | |
| 680 | #ifdef DEBUG |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 681 | TraceIC(kind_ == Code::CALL_IC ? "CallIC" : "KeyedCallIC", |
| 682 | name, state, target(), in_loop ? " (in-loop)" : ""); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 683 | #endif |
| 684 | } |
| 685 | |
| 686 | |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 687 | Object* KeyedCallIC::LoadFunction(State state, |
| 688 | Handle<Object> object, |
| 689 | Handle<Object> key) { |
| 690 | if (key->IsSymbol()) { |
| 691 | return CallICBase::LoadFunction(state, object, Handle<String>::cast(key)); |
| 692 | } |
| 693 | |
| 694 | if (object->IsUndefined() || object->IsNull()) { |
| 695 | return TypeError("non_object_property_call", object, key); |
| 696 | } |
| 697 | |
| 698 | if (object->IsString() || object->IsNumber() || object->IsBoolean()) { |
| 699 | ReceiverToObject(object); |
| 700 | } |
| 701 | |
| 702 | if (FLAG_use_ic && state != MEGAMORPHIC && !object->IsAccessCheckNeeded()) { |
| 703 | int argc = target()->arguments_count(); |
| 704 | InLoopFlag in_loop = target()->ic_in_loop(); |
| 705 | Object* code = StubCache::ComputeCallMegamorphic( |
| 706 | argc, in_loop, Code::KEYED_CALL_IC); |
| 707 | if (!code->IsFailure()) { |
| 708 | set_target(Code::cast(code)); |
| 709 | #ifdef DEBUG |
| 710 | TraceIC( |
| 711 | "KeyedCallIC", key, state, target(), in_loop ? " (in-loop)" : ""); |
| 712 | #endif |
| 713 | } |
| 714 | } |
| 715 | Object* result = Runtime::GetObjectProperty(object, key); |
| 716 | if (result->IsJSFunction()) return result; |
| 717 | result = TryCallAsFunction(result); |
| 718 | return result->IsJSFunction() ? |
| 719 | result : TypeError("property_not_function", object, key); |
| 720 | } |
| 721 | |
| 722 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 723 | Object* LoadIC::Load(State state, Handle<Object> object, Handle<String> name) { |
| 724 | // If the object is undefined or null it's illegal to try to get any |
| 725 | // of its properties; throw a TypeError in that case. |
| 726 | if (object->IsUndefined() || object->IsNull()) { |
| 727 | return TypeError("non_object_property_load", object, name); |
| 728 | } |
| 729 | |
| 730 | if (FLAG_use_ic) { |
| 731 | // Use specialized code for getting the length of strings and |
| 732 | // string wrapper objects. The length property of string wrapper |
| 733 | // objects is read-only and therefore always returns the length of |
| 734 | // the underlying string value. See ECMA-262 15.5.5.1. |
| 735 | if ((object->IsString() || object->IsStringWrapper()) && |
| 736 | name->Equals(Heap::length_symbol())) { |
| 737 | HandleScope scope; |
| 738 | // Get the string if we have a string wrapper object. |
| 739 | if (object->IsJSValue()) { |
| 740 | object = Handle<Object>(Handle<JSValue>::cast(object)->value()); |
| 741 | } |
| 742 | #ifdef DEBUG |
| 743 | if (FLAG_trace_ic) PrintF("[LoadIC : +#length /string]\n"); |
| 744 | #endif |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 745 | Map* map = HeapObject::cast(*object)->map(); |
| 746 | if (object->IsString()) { |
| 747 | const int offset = String::kLengthOffset; |
| 748 | PatchInlinedLoad(address(), map, offset); |
| 749 | } |
| 750 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 751 | Code* target = NULL; |
| 752 | target = Builtins::builtin(Builtins::LoadIC_StringLength); |
| 753 | set_target(target); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 754 | return Smi::FromInt(String::cast(*object)->length()); |
| 755 | } |
| 756 | |
| 757 | // Use specialized code for getting the length of arrays. |
| 758 | if (object->IsJSArray() && name->Equals(Heap::length_symbol())) { |
| 759 | #ifdef DEBUG |
| 760 | if (FLAG_trace_ic) PrintF("[LoadIC : +#length /array]\n"); |
| 761 | #endif |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 762 | Map* map = HeapObject::cast(*object)->map(); |
| 763 | const int offset = JSArray::kLengthOffset; |
| 764 | PatchInlinedLoad(address(), map, offset); |
| 765 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 766 | Code* target = Builtins::builtin(Builtins::LoadIC_ArrayLength); |
| 767 | set_target(target); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 768 | return JSArray::cast(*object)->length(); |
| 769 | } |
| 770 | |
| 771 | // Use specialized code for getting prototype of functions. |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 772 | if (object->IsJSFunction() && name->Equals(Heap::prototype_symbol()) && |
| 773 | JSFunction::cast(*object)->should_have_prototype()) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 774 | #ifdef DEBUG |
| 775 | if (FLAG_trace_ic) PrintF("[LoadIC : +#prototype /function]\n"); |
| 776 | #endif |
| 777 | Code* target = Builtins::builtin(Builtins::LoadIC_FunctionPrototype); |
| 778 | set_target(target); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 779 | return Accessors::FunctionGetPrototype(*object, 0); |
| 780 | } |
| 781 | } |
| 782 | |
| 783 | // Check if the name is trivially convertible to an index and get |
| 784 | // the element if so. |
| 785 | uint32_t index; |
| 786 | if (name->AsArrayIndex(&index)) return object->GetElement(index); |
| 787 | |
| 788 | // Named lookup in the object. |
| 789 | LookupResult lookup; |
| 790 | LookupForRead(*object, *name, &lookup); |
| 791 | |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 792 | // If we did not find a property, check if we need to throw an exception. |
| 793 | if (!lookup.IsProperty()) { |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 794 | if (FLAG_strict || IsContextual(object)) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 795 | return ReferenceError("not_defined", name); |
| 796 | } |
| 797 | LOG(SuspectReadEvent(*name, *object)); |
| 798 | } |
| 799 | |
| 800 | bool can_be_inlined = |
| 801 | FLAG_use_ic && |
| 802 | state == PREMONOMORPHIC && |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 803 | lookup.IsProperty() && |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 804 | lookup.IsCacheable() && |
| 805 | lookup.holder() == *object && |
| 806 | lookup.type() == FIELD && |
| 807 | !object->IsAccessCheckNeeded(); |
| 808 | |
| 809 | if (can_be_inlined) { |
| 810 | Map* map = lookup.holder()->map(); |
| 811 | // Property's index in the properties array. If negative we have |
| 812 | // an inobject property. |
| 813 | int index = lookup.GetFieldIndex() - map->inobject_properties(); |
| 814 | if (index < 0) { |
| 815 | // Index is an offset from the end of the object. |
| 816 | int offset = map->instance_size() + (index * kPointerSize); |
| 817 | if (PatchInlinedLoad(address(), map, offset)) { |
| 818 | set_target(megamorphic_stub()); |
Kristian Monsen | 9dcf7e2 | 2010-06-28 14:14:28 +0100 | [diff] [blame] | 819 | #ifdef DEBUG |
| 820 | if (FLAG_trace_ic) { |
| 821 | PrintF("[LoadIC : inline patch %s]\n", *name->ToCString()); |
| 822 | } |
Kristian Monsen | 50ef84f | 2010-07-29 15:18:00 +0100 | [diff] [blame^] | 823 | #endif |
| 824 | return lookup.holder()->FastPropertyAt(lookup.GetFieldIndex()); |
| 825 | #ifdef DEBUG |
Kristian Monsen | 9dcf7e2 | 2010-06-28 14:14:28 +0100 | [diff] [blame] | 826 | } else { |
| 827 | if (FLAG_trace_ic) { |
| 828 | PrintF("[LoadIC : no inline patch %s (patching failed)]\n", |
| 829 | *name->ToCString()); |
| 830 | } |
| 831 | } |
| 832 | } else { |
| 833 | if (FLAG_trace_ic) { |
| 834 | PrintF("[LoadIC : no inline patch %s (not inobject)]\n", |
| 835 | *name->ToCString()); |
| 836 | } |
| 837 | } |
| 838 | } else { |
| 839 | if (FLAG_use_ic && state == PREMONOMORPHIC) { |
| 840 | if (FLAG_trace_ic) { |
| 841 | PrintF("[LoadIC : no inline patch %s (not inlinable)]\n", |
| 842 | *name->ToCString()); |
| 843 | #endif |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 844 | } |
| 845 | } |
| 846 | } |
| 847 | |
| 848 | // Update inline cache and stub cache. |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 849 | if (FLAG_use_ic) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 850 | UpdateCaches(&lookup, state, object, name); |
| 851 | } |
| 852 | |
| 853 | PropertyAttributes attr; |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 854 | if (lookup.IsProperty() && lookup.type() == INTERCEPTOR) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 855 | // Get the property. |
| 856 | Object* result = object->GetProperty(*object, &lookup, *name, &attr); |
| 857 | if (result->IsFailure()) return result; |
| 858 | // If the property is not present, check if we need to throw an |
| 859 | // exception. |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 860 | if (attr == ABSENT && IsContextual(object)) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 861 | return ReferenceError("not_defined", name); |
| 862 | } |
| 863 | return result; |
| 864 | } |
| 865 | |
| 866 | // Get the property. |
| 867 | return object->GetProperty(*object, &lookup, *name, &attr); |
| 868 | } |
| 869 | |
| 870 | |
| 871 | void LoadIC::UpdateCaches(LookupResult* lookup, |
| 872 | State state, |
| 873 | Handle<Object> object, |
| 874 | Handle<String> name) { |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 875 | // Bail out if the result is not cacheable. |
| 876 | if (!lookup->IsCacheable()) return; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 877 | |
| 878 | // Loading properties from values is not common, so don't try to |
| 879 | // deal with non-JS objects here. |
| 880 | if (!object->IsJSObject()) return; |
| 881 | Handle<JSObject> receiver = Handle<JSObject>::cast(object); |
| 882 | |
Steve Block | 8defd9f | 2010-07-08 12:39:36 +0100 | [diff] [blame] | 883 | if (HasNormalObjectsInPrototypeChain(lookup, *object)) return; |
| 884 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 885 | // Compute the code stub for this load. |
| 886 | Object* code = NULL; |
| 887 | if (state == UNINITIALIZED) { |
| 888 | // This is the first time we execute this inline cache. |
| 889 | // Set the target to the pre monomorphic stub to delay |
| 890 | // setting the monomorphic state. |
| 891 | code = pre_monomorphic_stub(); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 892 | } else if (!lookup->IsProperty()) { |
| 893 | // Nonexistent property. The result is undefined. |
| 894 | code = StubCache::ComputeLoadNonexistent(*name, *receiver); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 895 | } else { |
| 896 | // Compute monomorphic stub. |
| 897 | switch (lookup->type()) { |
| 898 | case FIELD: { |
| 899 | code = StubCache::ComputeLoadField(*name, *receiver, |
| 900 | lookup->holder(), |
| 901 | lookup->GetFieldIndex()); |
| 902 | break; |
| 903 | } |
| 904 | case CONSTANT_FUNCTION: { |
| 905 | Object* constant = lookup->GetConstantFunction(); |
| 906 | code = StubCache::ComputeLoadConstant(*name, *receiver, |
| 907 | lookup->holder(), constant); |
| 908 | break; |
| 909 | } |
| 910 | case NORMAL: { |
| 911 | if (lookup->holder()->IsGlobalObject()) { |
| 912 | GlobalObject* global = GlobalObject::cast(lookup->holder()); |
| 913 | JSGlobalPropertyCell* cell = |
| 914 | JSGlobalPropertyCell::cast(global->GetPropertyCell(lookup)); |
| 915 | code = StubCache::ComputeLoadGlobal(*name, |
| 916 | *receiver, |
| 917 | global, |
| 918 | cell, |
| 919 | lookup->IsDontDelete()); |
| 920 | } else { |
| 921 | // There is only one shared stub for loading normalized |
| 922 | // properties. It does not traverse the prototype chain, so the |
| 923 | // property must be found in the receiver for the stub to be |
| 924 | // applicable. |
| 925 | if (lookup->holder() != *receiver) return; |
Steve Block | 8defd9f | 2010-07-08 12:39:36 +0100 | [diff] [blame] | 926 | code = StubCache::ComputeLoadNormal(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 927 | } |
| 928 | break; |
| 929 | } |
| 930 | case CALLBACKS: { |
| 931 | if (!lookup->GetCallbackObject()->IsAccessorInfo()) return; |
| 932 | AccessorInfo* callback = |
| 933 | AccessorInfo::cast(lookup->GetCallbackObject()); |
| 934 | if (v8::ToCData<Address>(callback->getter()) == 0) return; |
| 935 | code = StubCache::ComputeLoadCallback(*name, *receiver, |
| 936 | lookup->holder(), callback); |
| 937 | break; |
| 938 | } |
| 939 | case INTERCEPTOR: { |
| 940 | ASSERT(HasInterceptorGetter(lookup->holder())); |
| 941 | code = StubCache::ComputeLoadInterceptor(*name, *receiver, |
| 942 | lookup->holder()); |
| 943 | break; |
| 944 | } |
| 945 | default: |
| 946 | return; |
| 947 | } |
| 948 | } |
| 949 | |
| 950 | // If we're unable to compute the stub (not enough memory left), we |
| 951 | // simply avoid updating the caches. |
| 952 | if (code == NULL || code->IsFailure()) return; |
| 953 | |
| 954 | // Patch the call site depending on the state of the cache. |
| 955 | if (state == UNINITIALIZED || state == PREMONOMORPHIC || |
| 956 | state == MONOMORPHIC_PROTOTYPE_FAILURE) { |
| 957 | set_target(Code::cast(code)); |
| 958 | } else if (state == MONOMORPHIC) { |
| 959 | set_target(megamorphic_stub()); |
Kristian Monsen | 9dcf7e2 | 2010-06-28 14:14:28 +0100 | [diff] [blame] | 960 | } else if (state == MEGAMORPHIC) { |
Steve Block | 8defd9f | 2010-07-08 12:39:36 +0100 | [diff] [blame] | 961 | // Cache code holding map should be consistent with |
| 962 | // GenerateMonomorphicCacheProbe. |
| 963 | Map* map = JSObject::cast(object->IsJSObject() ? *object : |
| 964 | object->GetPrototype())->map(); |
| 965 | |
| 966 | StubCache::Set(*name, map, Code::cast(code)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 967 | } |
| 968 | |
| 969 | #ifdef DEBUG |
| 970 | TraceIC("LoadIC", name, state, target()); |
| 971 | #endif |
| 972 | } |
| 973 | |
| 974 | |
| 975 | Object* KeyedLoadIC::Load(State state, |
| 976 | Handle<Object> object, |
| 977 | Handle<Object> key) { |
| 978 | if (key->IsSymbol()) { |
| 979 | Handle<String> name = Handle<String>::cast(key); |
| 980 | |
| 981 | // If the object is undefined or null it's illegal to try to get any |
| 982 | // of its properties; throw a TypeError in that case. |
| 983 | if (object->IsUndefined() || object->IsNull()) { |
| 984 | return TypeError("non_object_property_load", object, name); |
| 985 | } |
| 986 | |
| 987 | if (FLAG_use_ic) { |
| 988 | // Use specialized code for getting the length of strings. |
| 989 | if (object->IsString() && name->Equals(Heap::length_symbol())) { |
| 990 | Handle<String> string = Handle<String>::cast(object); |
| 991 | Object* code = NULL; |
| 992 | code = StubCache::ComputeKeyedLoadStringLength(*name, *string); |
| 993 | if (code->IsFailure()) return code; |
| 994 | set_target(Code::cast(code)); |
| 995 | #ifdef DEBUG |
| 996 | TraceIC("KeyedLoadIC", name, state, target()); |
| 997 | #endif // DEBUG |
| 998 | return Smi::FromInt(string->length()); |
| 999 | } |
| 1000 | |
| 1001 | // Use specialized code for getting the length of arrays. |
| 1002 | if (object->IsJSArray() && name->Equals(Heap::length_symbol())) { |
| 1003 | Handle<JSArray> array = Handle<JSArray>::cast(object); |
| 1004 | Object* code = StubCache::ComputeKeyedLoadArrayLength(*name, *array); |
| 1005 | if (code->IsFailure()) return code; |
| 1006 | set_target(Code::cast(code)); |
| 1007 | #ifdef DEBUG |
| 1008 | TraceIC("KeyedLoadIC", name, state, target()); |
| 1009 | #endif // DEBUG |
| 1010 | return JSArray::cast(*object)->length(); |
| 1011 | } |
| 1012 | |
| 1013 | // Use specialized code for getting prototype of functions. |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 1014 | if (object->IsJSFunction() && name->Equals(Heap::prototype_symbol()) && |
| 1015 | JSFunction::cast(*object)->should_have_prototype()) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1016 | Handle<JSFunction> function = Handle<JSFunction>::cast(object); |
| 1017 | Object* code = |
| 1018 | StubCache::ComputeKeyedLoadFunctionPrototype(*name, *function); |
| 1019 | if (code->IsFailure()) return code; |
| 1020 | set_target(Code::cast(code)); |
| 1021 | #ifdef DEBUG |
| 1022 | TraceIC("KeyedLoadIC", name, state, target()); |
| 1023 | #endif // DEBUG |
| 1024 | return Accessors::FunctionGetPrototype(*object, 0); |
| 1025 | } |
| 1026 | } |
| 1027 | |
| 1028 | // Check if the name is trivially convertible to an index and get |
| 1029 | // the element or char if so. |
| 1030 | uint32_t index = 0; |
| 1031 | if (name->AsArrayIndex(&index)) { |
| 1032 | HandleScope scope; |
| 1033 | // Rewrite to the generic keyed load stub. |
| 1034 | if (FLAG_use_ic) set_target(generic_stub()); |
| 1035 | return Runtime::GetElementOrCharAt(object, index); |
| 1036 | } |
| 1037 | |
| 1038 | // Named lookup. |
| 1039 | LookupResult lookup; |
| 1040 | LookupForRead(*object, *name, &lookup); |
| 1041 | |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 1042 | // If we did not find a property, check if we need to throw an exception. |
| 1043 | if (!lookup.IsProperty()) { |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 1044 | if (FLAG_strict || IsContextual(object)) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1045 | return ReferenceError("not_defined", name); |
| 1046 | } |
| 1047 | } |
| 1048 | |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 1049 | if (FLAG_use_ic) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1050 | UpdateCaches(&lookup, state, object, name); |
| 1051 | } |
| 1052 | |
| 1053 | PropertyAttributes attr; |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 1054 | if (lookup.IsProperty() && lookup.type() == INTERCEPTOR) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1055 | // Get the property. |
| 1056 | Object* result = object->GetProperty(*object, &lookup, *name, &attr); |
| 1057 | if (result->IsFailure()) return result; |
| 1058 | // If the property is not present, check if we need to throw an |
| 1059 | // exception. |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 1060 | if (attr == ABSENT && IsContextual(object)) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1061 | return ReferenceError("not_defined", name); |
| 1062 | } |
| 1063 | return result; |
| 1064 | } |
| 1065 | |
| 1066 | return object->GetProperty(*object, &lookup, *name, &attr); |
| 1067 | } |
| 1068 | |
| 1069 | // Do not use ICs for objects that require access checks (including |
| 1070 | // the global object). |
| 1071 | bool use_ic = FLAG_use_ic && !object->IsAccessCheckNeeded(); |
| 1072 | |
| 1073 | if (use_ic) { |
Steve Block | 3ce2e20 | 2009-11-05 08:53:23 +0000 | [diff] [blame] | 1074 | Code* stub = generic_stub(); |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 1075 | if (object->IsString() && key->IsNumber()) { |
| 1076 | stub = string_stub(); |
| 1077 | } else if (object->IsJSObject()) { |
Steve Block | 3ce2e20 | 2009-11-05 08:53:23 +0000 | [diff] [blame] | 1078 | Handle<JSObject> receiver = Handle<JSObject>::cast(object); |
| 1079 | if (receiver->HasExternalArrayElements()) { |
| 1080 | stub = external_array_stub(receiver->GetElementsKind()); |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 1081 | } else if (receiver->HasIndexedInterceptor()) { |
| 1082 | stub = indexed_interceptor_stub(); |
Steve Block | 3ce2e20 | 2009-11-05 08:53:23 +0000 | [diff] [blame] | 1083 | } |
| 1084 | } |
| 1085 | set_target(stub); |
Steve Block | 8defd9f | 2010-07-08 12:39:36 +0100 | [diff] [blame] | 1086 | // For JSObjects with fast elements that are not value wrappers |
| 1087 | // and that do not have indexed interceptors, we initialize the |
| 1088 | // inlined fast case (if present) by patching the inlined map |
| 1089 | // check. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1090 | if (object->IsJSObject() && |
| 1091 | !object->IsJSValue() && |
Steve Block | 8defd9f | 2010-07-08 12:39:36 +0100 | [diff] [blame] | 1092 | !JSObject::cast(*object)->HasIndexedInterceptor() && |
| 1093 | JSObject::cast(*object)->HasFastElements()) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1094 | Map* map = JSObject::cast(*object)->map(); |
| 1095 | PatchInlinedLoad(address(), map); |
| 1096 | } |
| 1097 | } |
| 1098 | |
| 1099 | // Get the property. |
| 1100 | return Runtime::GetObjectProperty(object, key); |
| 1101 | } |
| 1102 | |
| 1103 | |
| 1104 | void KeyedLoadIC::UpdateCaches(LookupResult* lookup, State state, |
| 1105 | Handle<Object> object, Handle<String> name) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1106 | // Bail out if we didn't find a result. |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 1107 | if (!lookup->IsProperty() || !lookup->IsCacheable()) return; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1108 | |
| 1109 | if (!object->IsJSObject()) return; |
| 1110 | Handle<JSObject> receiver = Handle<JSObject>::cast(object); |
| 1111 | |
Steve Block | 8defd9f | 2010-07-08 12:39:36 +0100 | [diff] [blame] | 1112 | if (HasNormalObjectsInPrototypeChain(lookup, *object)) return; |
| 1113 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1114 | // Compute the code stub for this load. |
| 1115 | Object* code = NULL; |
| 1116 | |
| 1117 | if (state == UNINITIALIZED) { |
| 1118 | // This is the first time we execute this inline cache. |
| 1119 | // Set the target to the pre monomorphic stub to delay |
| 1120 | // setting the monomorphic state. |
| 1121 | code = pre_monomorphic_stub(); |
| 1122 | } else { |
| 1123 | // Compute a monomorphic stub. |
| 1124 | switch (lookup->type()) { |
| 1125 | case FIELD: { |
| 1126 | code = StubCache::ComputeKeyedLoadField(*name, *receiver, |
| 1127 | lookup->holder(), |
| 1128 | lookup->GetFieldIndex()); |
| 1129 | break; |
| 1130 | } |
| 1131 | case CONSTANT_FUNCTION: { |
| 1132 | Object* constant = lookup->GetConstantFunction(); |
| 1133 | code = StubCache::ComputeKeyedLoadConstant(*name, *receiver, |
| 1134 | lookup->holder(), constant); |
| 1135 | break; |
| 1136 | } |
| 1137 | case CALLBACKS: { |
| 1138 | if (!lookup->GetCallbackObject()->IsAccessorInfo()) return; |
| 1139 | AccessorInfo* callback = |
| 1140 | AccessorInfo::cast(lookup->GetCallbackObject()); |
| 1141 | if (v8::ToCData<Address>(callback->getter()) == 0) return; |
| 1142 | code = StubCache::ComputeKeyedLoadCallback(*name, *receiver, |
| 1143 | lookup->holder(), callback); |
| 1144 | break; |
| 1145 | } |
| 1146 | case INTERCEPTOR: { |
| 1147 | ASSERT(HasInterceptorGetter(lookup->holder())); |
| 1148 | code = StubCache::ComputeKeyedLoadInterceptor(*name, *receiver, |
| 1149 | lookup->holder()); |
| 1150 | break; |
| 1151 | } |
| 1152 | default: { |
| 1153 | // Always rewrite to the generic case so that we do not |
| 1154 | // repeatedly try to rewrite. |
| 1155 | code = generic_stub(); |
| 1156 | break; |
| 1157 | } |
| 1158 | } |
| 1159 | } |
| 1160 | |
| 1161 | // If we're unable to compute the stub (not enough memory left), we |
| 1162 | // simply avoid updating the caches. |
| 1163 | if (code == NULL || code->IsFailure()) return; |
| 1164 | |
| 1165 | // Patch the call site depending on the state of the cache. Make |
| 1166 | // sure to always rewrite from monomorphic to megamorphic. |
| 1167 | ASSERT(state != MONOMORPHIC_PROTOTYPE_FAILURE); |
| 1168 | if (state == UNINITIALIZED || state == PREMONOMORPHIC) { |
| 1169 | set_target(Code::cast(code)); |
| 1170 | } else if (state == MONOMORPHIC) { |
| 1171 | set_target(megamorphic_stub()); |
| 1172 | } |
| 1173 | |
| 1174 | #ifdef DEBUG |
| 1175 | TraceIC("KeyedLoadIC", name, state, target()); |
| 1176 | #endif |
| 1177 | } |
| 1178 | |
| 1179 | |
| 1180 | static bool StoreICableLookup(LookupResult* lookup) { |
| 1181 | // Bail out if we didn't find a result. |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 1182 | if (!lookup->IsPropertyOrTransition() || !lookup->IsCacheable()) return false; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1183 | |
| 1184 | // If the property is read-only, we leave the IC in its current |
| 1185 | // state. |
| 1186 | if (lookup->IsReadOnly()) return false; |
| 1187 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1188 | return true; |
| 1189 | } |
| 1190 | |
| 1191 | |
| 1192 | static bool LookupForWrite(JSObject* object, |
| 1193 | String* name, |
| 1194 | LookupResult* lookup) { |
| 1195 | object->LocalLookup(name, lookup); |
| 1196 | if (!StoreICableLookup(lookup)) { |
| 1197 | return false; |
| 1198 | } |
| 1199 | |
| 1200 | if (lookup->type() == INTERCEPTOR) { |
| 1201 | if (object->GetNamedInterceptor()->setter()->IsUndefined()) { |
| 1202 | object->LocalLookupRealNamedProperty(name, lookup); |
| 1203 | return StoreICableLookup(lookup); |
| 1204 | } |
| 1205 | } |
| 1206 | |
| 1207 | return true; |
| 1208 | } |
| 1209 | |
| 1210 | |
| 1211 | Object* StoreIC::Store(State state, |
| 1212 | Handle<Object> object, |
| 1213 | Handle<String> name, |
| 1214 | Handle<Object> value) { |
| 1215 | // If the object is undefined or null it's illegal to try to set any |
| 1216 | // properties on it; throw a TypeError in that case. |
| 1217 | if (object->IsUndefined() || object->IsNull()) { |
| 1218 | return TypeError("non_object_property_store", object, name); |
| 1219 | } |
| 1220 | |
| 1221 | // Ignore stores where the receiver is not a JSObject. |
| 1222 | if (!object->IsJSObject()) return *value; |
| 1223 | Handle<JSObject> receiver = Handle<JSObject>::cast(object); |
| 1224 | |
| 1225 | // Check if the given name is an array index. |
| 1226 | uint32_t index; |
| 1227 | if (name->AsArrayIndex(&index)) { |
| 1228 | HandleScope scope; |
| 1229 | Handle<Object> result = SetElement(receiver, index, value); |
| 1230 | if (result.is_null()) return Failure::Exception(); |
| 1231 | return *value; |
| 1232 | } |
| 1233 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 1234 | // Use specialized code for setting the length of arrays. |
| 1235 | if (receiver->IsJSArray() |
| 1236 | && name->Equals(Heap::length_symbol()) |
| 1237 | && receiver->AllowsSetElementsLength()) { |
| 1238 | #ifdef DEBUG |
| 1239 | if (FLAG_trace_ic) PrintF("[StoreIC : +#length /array]\n"); |
| 1240 | #endif |
| 1241 | Code* target = Builtins::builtin(Builtins::StoreIC_ArrayLength); |
| 1242 | set_target(target); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 1243 | return receiver->SetProperty(*name, *value, NONE); |
| 1244 | } |
| 1245 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1246 | // Lookup the property locally in the receiver. |
| 1247 | if (FLAG_use_ic && !receiver->IsJSGlobalProxy()) { |
| 1248 | LookupResult lookup; |
Kristian Monsen | 50ef84f | 2010-07-29 15:18:00 +0100 | [diff] [blame^] | 1249 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1250 | if (LookupForWrite(*receiver, *name, &lookup)) { |
Kristian Monsen | 50ef84f | 2010-07-29 15:18:00 +0100 | [diff] [blame^] | 1251 | bool can_be_inlined = |
| 1252 | state == UNINITIALIZED && |
| 1253 | lookup.IsProperty() && |
| 1254 | lookup.holder() == *receiver && |
| 1255 | lookup.type() == FIELD && |
| 1256 | !receiver->IsAccessCheckNeeded(); |
| 1257 | |
| 1258 | if (can_be_inlined) { |
| 1259 | Map* map = lookup.holder()->map(); |
| 1260 | // Property's index in the properties array. If negative we have |
| 1261 | // an inobject property. |
| 1262 | int index = lookup.GetFieldIndex() - map->inobject_properties(); |
| 1263 | if (index < 0) { |
| 1264 | // Index is an offset from the end of the object. |
| 1265 | int offset = map->instance_size() + (index * kPointerSize); |
| 1266 | if (PatchInlinedStore(address(), map, offset)) { |
| 1267 | set_target(megamorphic_stub()); |
| 1268 | #ifdef DEBUG |
| 1269 | if (FLAG_trace_ic) { |
| 1270 | PrintF("[StoreIC : inline patch %s]\n", *name->ToCString()); |
| 1271 | } |
| 1272 | #endif |
| 1273 | return receiver->SetProperty(*name, *value, NONE); |
| 1274 | #ifdef DEBUG |
| 1275 | |
| 1276 | } else { |
| 1277 | if (FLAG_trace_ic) { |
| 1278 | PrintF("[StoreIC : no inline patch %s (patching failed)]\n", |
| 1279 | *name->ToCString()); |
| 1280 | } |
| 1281 | } |
| 1282 | } else { |
| 1283 | if (FLAG_trace_ic) { |
| 1284 | PrintF("[StoreIC : no inline patch %s (not inobject)]\n", |
| 1285 | *name->ToCString()); |
| 1286 | } |
| 1287 | } |
| 1288 | } else { |
| 1289 | if (state == PREMONOMORPHIC) { |
| 1290 | if (FLAG_trace_ic) { |
| 1291 | PrintF("[StoreIC : no inline patch %s (not inlinable)]\n", |
| 1292 | *name->ToCString()); |
| 1293 | #endif |
| 1294 | } |
| 1295 | } |
| 1296 | } |
| 1297 | |
| 1298 | // If no inlined store ic was patched, generate a stub for this |
| 1299 | // store. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1300 | UpdateCaches(&lookup, state, receiver, name, value); |
| 1301 | } |
| 1302 | } |
| 1303 | |
| 1304 | // Set the property. |
| 1305 | return receiver->SetProperty(*name, *value, NONE); |
| 1306 | } |
| 1307 | |
| 1308 | |
| 1309 | void StoreIC::UpdateCaches(LookupResult* lookup, |
| 1310 | State state, |
| 1311 | Handle<JSObject> receiver, |
| 1312 | Handle<String> name, |
| 1313 | Handle<Object> value) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1314 | // Skip JSGlobalProxy. |
| 1315 | ASSERT(!receiver->IsJSGlobalProxy()); |
| 1316 | |
| 1317 | ASSERT(StoreICableLookup(lookup)); |
| 1318 | |
| 1319 | // If the property has a non-field type allowing map transitions |
| 1320 | // where there is extra room in the object, we leave the IC in its |
| 1321 | // current state. |
| 1322 | PropertyType type = lookup->type(); |
| 1323 | |
| 1324 | // Compute the code stub for this store; used for rewriting to |
| 1325 | // monomorphic state and making sure that the code stub is in the |
| 1326 | // stub cache. |
| 1327 | Object* code = NULL; |
| 1328 | switch (type) { |
| 1329 | case FIELD: { |
| 1330 | code = StubCache::ComputeStoreField(*name, *receiver, |
| 1331 | lookup->GetFieldIndex()); |
| 1332 | break; |
| 1333 | } |
| 1334 | case MAP_TRANSITION: { |
| 1335 | if (lookup->GetAttributes() != NONE) return; |
| 1336 | HandleScope scope; |
| 1337 | ASSERT(type == MAP_TRANSITION); |
| 1338 | Handle<Map> transition(lookup->GetTransitionMap()); |
| 1339 | int index = transition->PropertyIndexFor(*name); |
| 1340 | code = StubCache::ComputeStoreField(*name, *receiver, index, *transition); |
| 1341 | break; |
| 1342 | } |
| 1343 | case NORMAL: { |
Steve Block | 8defd9f | 2010-07-08 12:39:36 +0100 | [diff] [blame] | 1344 | if (receiver->IsGlobalObject()) { |
| 1345 | // The stub generated for the global object picks the value directly |
| 1346 | // from the property cell. So the property must be directly on the |
| 1347 | // global object. |
| 1348 | Handle<GlobalObject> global = Handle<GlobalObject>::cast(receiver); |
| 1349 | JSGlobalPropertyCell* cell = |
| 1350 | JSGlobalPropertyCell::cast(global->GetPropertyCell(lookup)); |
| 1351 | code = StubCache::ComputeStoreGlobal(*name, *global, cell); |
| 1352 | } else { |
| 1353 | if (lookup->holder() != *receiver) return; |
| 1354 | code = StubCache::ComputeStoreNormal(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1355 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1356 | break; |
| 1357 | } |
| 1358 | case CALLBACKS: { |
| 1359 | if (!lookup->GetCallbackObject()->IsAccessorInfo()) return; |
| 1360 | AccessorInfo* callback = AccessorInfo::cast(lookup->GetCallbackObject()); |
| 1361 | if (v8::ToCData<Address>(callback->setter()) == 0) return; |
| 1362 | code = StubCache::ComputeStoreCallback(*name, *receiver, callback); |
| 1363 | break; |
| 1364 | } |
| 1365 | case INTERCEPTOR: { |
| 1366 | ASSERT(!receiver->GetNamedInterceptor()->setter()->IsUndefined()); |
| 1367 | code = StubCache::ComputeStoreInterceptor(*name, *receiver); |
| 1368 | break; |
| 1369 | } |
| 1370 | default: |
| 1371 | return; |
| 1372 | } |
| 1373 | |
| 1374 | // If we're unable to compute the stub (not enough memory left), we |
| 1375 | // simply avoid updating the caches. |
| 1376 | if (code == NULL || code->IsFailure()) return; |
| 1377 | |
| 1378 | // Patch the call site depending on the state of the cache. |
| 1379 | if (state == UNINITIALIZED || state == MONOMORPHIC_PROTOTYPE_FAILURE) { |
| 1380 | set_target(Code::cast(code)); |
| 1381 | } else if (state == MONOMORPHIC) { |
Kristian Monsen | 9dcf7e2 | 2010-06-28 14:14:28 +0100 | [diff] [blame] | 1382 | // Only move to megamorphic if the target changes. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1383 | if (target() != Code::cast(code)) set_target(megamorphic_stub()); |
Kristian Monsen | 9dcf7e2 | 2010-06-28 14:14:28 +0100 | [diff] [blame] | 1384 | } else if (state == MEGAMORPHIC) { |
| 1385 | // Update the stub cache. |
| 1386 | StubCache::Set(*name, receiver->map(), Code::cast(code)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1387 | } |
| 1388 | |
| 1389 | #ifdef DEBUG |
| 1390 | TraceIC("StoreIC", name, state, target()); |
| 1391 | #endif |
| 1392 | } |
| 1393 | |
| 1394 | |
| 1395 | Object* KeyedStoreIC::Store(State state, |
| 1396 | Handle<Object> object, |
| 1397 | Handle<Object> key, |
| 1398 | Handle<Object> value) { |
| 1399 | if (key->IsSymbol()) { |
| 1400 | Handle<String> name = Handle<String>::cast(key); |
| 1401 | |
| 1402 | // If the object is undefined or null it's illegal to try to set any |
| 1403 | // properties on it; throw a TypeError in that case. |
| 1404 | if (object->IsUndefined() || object->IsNull()) { |
| 1405 | return TypeError("non_object_property_store", object, name); |
| 1406 | } |
| 1407 | |
| 1408 | // Ignore stores where the receiver is not a JSObject. |
| 1409 | if (!object->IsJSObject()) return *value; |
| 1410 | Handle<JSObject> receiver = Handle<JSObject>::cast(object); |
| 1411 | |
| 1412 | // Check if the given name is an array index. |
| 1413 | uint32_t index; |
| 1414 | if (name->AsArrayIndex(&index)) { |
| 1415 | HandleScope scope; |
| 1416 | Handle<Object> result = SetElement(receiver, index, value); |
| 1417 | if (result.is_null()) return Failure::Exception(); |
| 1418 | return *value; |
| 1419 | } |
| 1420 | |
| 1421 | // Lookup the property locally in the receiver. |
| 1422 | LookupResult lookup; |
| 1423 | receiver->LocalLookup(*name, &lookup); |
| 1424 | |
| 1425 | // Update inline cache and stub cache. |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 1426 | if (FLAG_use_ic) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1427 | UpdateCaches(&lookup, state, receiver, name, value); |
| 1428 | } |
| 1429 | |
| 1430 | // Set the property. |
| 1431 | return receiver->SetProperty(*name, *value, NONE); |
| 1432 | } |
| 1433 | |
| 1434 | // Do not use ICs for objects that require access checks (including |
| 1435 | // the global object). |
| 1436 | bool use_ic = FLAG_use_ic && !object->IsAccessCheckNeeded(); |
| 1437 | ASSERT(!(use_ic && object->IsJSGlobalProxy())); |
| 1438 | |
Steve Block | 3ce2e20 | 2009-11-05 08:53:23 +0000 | [diff] [blame] | 1439 | if (use_ic) { |
| 1440 | Code* stub = generic_stub(); |
| 1441 | if (object->IsJSObject()) { |
| 1442 | Handle<JSObject> receiver = Handle<JSObject>::cast(object); |
| 1443 | if (receiver->HasExternalArrayElements()) { |
| 1444 | stub = external_array_stub(receiver->GetElementsKind()); |
| 1445 | } |
| 1446 | } |
| 1447 | set_target(stub); |
| 1448 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1449 | |
| 1450 | // Set the property. |
| 1451 | return Runtime::SetObjectProperty(object, key, value, NONE); |
| 1452 | } |
| 1453 | |
| 1454 | |
| 1455 | void KeyedStoreIC::UpdateCaches(LookupResult* lookup, |
| 1456 | State state, |
| 1457 | Handle<JSObject> receiver, |
| 1458 | Handle<String> name, |
| 1459 | Handle<Object> value) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1460 | // Skip JSGlobalProxy. |
| 1461 | if (receiver->IsJSGlobalProxy()) return; |
| 1462 | |
| 1463 | // Bail out if we didn't find a result. |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 1464 | if (!lookup->IsPropertyOrTransition() || !lookup->IsCacheable()) return; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1465 | |
| 1466 | // If the property is read-only, we leave the IC in its current |
| 1467 | // state. |
| 1468 | if (lookup->IsReadOnly()) return; |
| 1469 | |
| 1470 | // If the property has a non-field type allowing map transitions |
| 1471 | // where there is extra room in the object, we leave the IC in its |
| 1472 | // current state. |
| 1473 | PropertyType type = lookup->type(); |
| 1474 | |
| 1475 | // Compute the code stub for this store; used for rewriting to |
| 1476 | // monomorphic state and making sure that the code stub is in the |
| 1477 | // stub cache. |
| 1478 | Object* code = NULL; |
| 1479 | |
| 1480 | switch (type) { |
| 1481 | case FIELD: { |
| 1482 | code = StubCache::ComputeKeyedStoreField(*name, *receiver, |
| 1483 | lookup->GetFieldIndex()); |
| 1484 | break; |
| 1485 | } |
| 1486 | case MAP_TRANSITION: { |
| 1487 | if (lookup->GetAttributes() == NONE) { |
| 1488 | HandleScope scope; |
| 1489 | ASSERT(type == MAP_TRANSITION); |
| 1490 | Handle<Map> transition(lookup->GetTransitionMap()); |
| 1491 | int index = transition->PropertyIndexFor(*name); |
| 1492 | code = StubCache::ComputeKeyedStoreField(*name, *receiver, |
| 1493 | index, *transition); |
| 1494 | break; |
| 1495 | } |
| 1496 | // fall through. |
| 1497 | } |
| 1498 | default: { |
| 1499 | // Always rewrite to the generic case so that we do not |
| 1500 | // repeatedly try to rewrite. |
| 1501 | code = generic_stub(); |
| 1502 | break; |
| 1503 | } |
| 1504 | } |
| 1505 | |
| 1506 | // If we're unable to compute the stub (not enough memory left), we |
| 1507 | // simply avoid updating the caches. |
| 1508 | if (code == NULL || code->IsFailure()) return; |
| 1509 | |
| 1510 | // Patch the call site depending on the state of the cache. Make |
| 1511 | // sure to always rewrite from monomorphic to megamorphic. |
| 1512 | ASSERT(state != MONOMORPHIC_PROTOTYPE_FAILURE); |
| 1513 | if (state == UNINITIALIZED || state == PREMONOMORPHIC) { |
| 1514 | set_target(Code::cast(code)); |
| 1515 | } else if (state == MONOMORPHIC) { |
| 1516 | set_target(megamorphic_stub()); |
| 1517 | } |
| 1518 | |
| 1519 | #ifdef DEBUG |
| 1520 | TraceIC("KeyedStoreIC", name, state, target()); |
| 1521 | #endif |
| 1522 | } |
| 1523 | |
| 1524 | |
| 1525 | // ---------------------------------------------------------------------------- |
| 1526 | // Static IC stub generators. |
| 1527 | // |
| 1528 | |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 1529 | static Object* CompileFunction(Object* result, |
| 1530 | Handle<Object> object, |
| 1531 | InLoopFlag in_loop) { |
| 1532 | // Compile now with optimization. |
| 1533 | HandleScope scope; |
| 1534 | Handle<JSFunction> function = Handle<JSFunction>(JSFunction::cast(result)); |
| 1535 | if (in_loop == IN_LOOP) { |
| 1536 | CompileLazyInLoop(function, object, CLEAR_EXCEPTION); |
| 1537 | } else { |
| 1538 | CompileLazy(function, object, CLEAR_EXCEPTION); |
| 1539 | } |
| 1540 | return *function; |
| 1541 | } |
| 1542 | |
| 1543 | |
| 1544 | // Used from ic-<arch>.cc. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1545 | Object* CallIC_Miss(Arguments args) { |
| 1546 | NoHandleAllocation na; |
| 1547 | ASSERT(args.length() == 2); |
| 1548 | CallIC ic; |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 1549 | IC::State state = IC::StateFrom(ic.target(), args[0], args[1]); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1550 | Object* result = |
| 1551 | ic.LoadFunction(state, args.at<Object>(0), args.at<String>(1)); |
| 1552 | |
| 1553 | // The first time the inline cache is updated may be the first time the |
| 1554 | // function it references gets called. If the function was lazily compiled |
| 1555 | // then the first call will trigger a compilation. We check for this case |
| 1556 | // and we do the compilation immediately, instead of waiting for the stub |
| 1557 | // currently attached to the JSFunction object to trigger compilation. We |
| 1558 | // do this in the case where we know that the inline cache is inside a loop, |
| 1559 | // because then we know that we want to optimize the function. |
| 1560 | if (!result->IsJSFunction() || JSFunction::cast(result)->is_compiled()) { |
| 1561 | return result; |
| 1562 | } |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 1563 | return CompileFunction(result, args.at<Object>(0), ic.target()->ic_in_loop()); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1564 | } |
| 1565 | |
| 1566 | |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 1567 | // Used from ic-<arch>.cc. |
| 1568 | Object* KeyedCallIC_Miss(Arguments args) { |
| 1569 | NoHandleAllocation na; |
| 1570 | ASSERT(args.length() == 2); |
| 1571 | KeyedCallIC ic; |
| 1572 | IC::State state = IC::StateFrom(ic.target(), args[0], args[1]); |
| 1573 | Object* result = |
| 1574 | ic.LoadFunction(state, args.at<Object>(0), args.at<Object>(1)); |
| 1575 | |
| 1576 | if (!result->IsJSFunction() || JSFunction::cast(result)->is_compiled()) { |
| 1577 | return result; |
| 1578 | } |
| 1579 | return CompileFunction(result, args.at<Object>(0), ic.target()->ic_in_loop()); |
| 1580 | } |
| 1581 | |
| 1582 | |
| 1583 | // Used from ic-<arch>.cc. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1584 | Object* LoadIC_Miss(Arguments args) { |
| 1585 | NoHandleAllocation na; |
| 1586 | ASSERT(args.length() == 2); |
| 1587 | LoadIC ic; |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 1588 | IC::State state = IC::StateFrom(ic.target(), args[0], args[1]); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1589 | return ic.Load(state, args.at<Object>(0), args.at<String>(1)); |
| 1590 | } |
| 1591 | |
| 1592 | |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 1593 | // Used from ic-<arch>.cc |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1594 | Object* KeyedLoadIC_Miss(Arguments args) { |
| 1595 | NoHandleAllocation na; |
| 1596 | ASSERT(args.length() == 2); |
| 1597 | KeyedLoadIC ic; |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 1598 | IC::State state = IC::StateFrom(ic.target(), args[0], args[1]); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1599 | return ic.Load(state, args.at<Object>(0), args.at<Object>(1)); |
| 1600 | } |
| 1601 | |
| 1602 | |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 1603 | // Used from ic-<arch>.cc. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1604 | Object* StoreIC_Miss(Arguments args) { |
| 1605 | NoHandleAllocation na; |
| 1606 | ASSERT(args.length() == 3); |
| 1607 | StoreIC ic; |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 1608 | IC::State state = IC::StateFrom(ic.target(), args[0], args[1]); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1609 | return ic.Store(state, args.at<Object>(0), args.at<String>(1), |
| 1610 | args.at<Object>(2)); |
| 1611 | } |
| 1612 | |
| 1613 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 1614 | Object* StoreIC_ArrayLength(Arguments args) { |
| 1615 | NoHandleAllocation nha; |
| 1616 | |
| 1617 | ASSERT(args.length() == 2); |
| 1618 | JSObject* receiver = JSObject::cast(args[0]); |
| 1619 | Object* len = args[1]; |
| 1620 | |
| 1621 | Object* result = receiver->SetElementsLength(len); |
| 1622 | if (result->IsFailure()) return result; |
| 1623 | return len; |
| 1624 | } |
| 1625 | |
| 1626 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1627 | // Extend storage is called in a store inline cache when |
| 1628 | // it is necessary to extend the properties array of a |
| 1629 | // JSObject. |
| 1630 | Object* SharedStoreIC_ExtendStorage(Arguments args) { |
| 1631 | NoHandleAllocation na; |
| 1632 | ASSERT(args.length() == 3); |
| 1633 | |
| 1634 | // Convert the parameters |
| 1635 | JSObject* object = JSObject::cast(args[0]); |
| 1636 | Map* transition = Map::cast(args[1]); |
| 1637 | Object* value = args[2]; |
| 1638 | |
| 1639 | // Check the object has run out out property space. |
| 1640 | ASSERT(object->HasFastProperties()); |
| 1641 | ASSERT(object->map()->unused_property_fields() == 0); |
| 1642 | |
| 1643 | // Expand the properties array. |
| 1644 | FixedArray* old_storage = object->properties(); |
| 1645 | int new_unused = transition->unused_property_fields(); |
| 1646 | int new_size = old_storage->length() + new_unused + 1; |
| 1647 | Object* result = old_storage->CopySize(new_size); |
| 1648 | if (result->IsFailure()) return result; |
| 1649 | FixedArray* new_storage = FixedArray::cast(result); |
| 1650 | new_storage->set(old_storage->length(), value); |
| 1651 | |
| 1652 | // Set the new property value and do the map transition. |
| 1653 | object->set_properties(new_storage); |
| 1654 | object->set_map(transition); |
| 1655 | |
| 1656 | // Return the stored value. |
| 1657 | return value; |
| 1658 | } |
| 1659 | |
| 1660 | |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 1661 | // Used from ic-<arch>.cc. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1662 | Object* KeyedStoreIC_Miss(Arguments args) { |
| 1663 | NoHandleAllocation na; |
| 1664 | ASSERT(args.length() == 3); |
| 1665 | KeyedStoreIC ic; |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 1666 | IC::State state = IC::StateFrom(ic.target(), args[0], args[1]); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1667 | return ic.Store(state, args.at<Object>(0), args.at<Object>(1), |
| 1668 | args.at<Object>(2)); |
| 1669 | } |
| 1670 | |
| 1671 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 1672 | void BinaryOpIC::patch(Code* code) { |
| 1673 | set_target(code); |
| 1674 | } |
| 1675 | |
| 1676 | |
| 1677 | const char* BinaryOpIC::GetName(TypeInfo type_info) { |
| 1678 | switch (type_info) { |
| 1679 | case DEFAULT: return "Default"; |
| 1680 | case GENERIC: return "Generic"; |
| 1681 | case HEAP_NUMBERS: return "HeapNumbers"; |
| 1682 | case STRINGS: return "Strings"; |
| 1683 | default: return "Invalid"; |
| 1684 | } |
| 1685 | } |
| 1686 | |
| 1687 | |
| 1688 | BinaryOpIC::State BinaryOpIC::ToState(TypeInfo type_info) { |
| 1689 | switch (type_info) { |
| 1690 | // DEFAULT is mapped to UNINITIALIZED so that calls to DEFAULT stubs |
| 1691 | // are not cleared at GC. |
| 1692 | case DEFAULT: return UNINITIALIZED; |
| 1693 | |
| 1694 | // Could have mapped GENERIC to MONOMORPHIC just as well but MEGAMORPHIC is |
| 1695 | // conceptually closer. |
| 1696 | case GENERIC: return MEGAMORPHIC; |
| 1697 | |
| 1698 | default: return MONOMORPHIC; |
| 1699 | } |
| 1700 | } |
| 1701 | |
| 1702 | |
| 1703 | BinaryOpIC::TypeInfo BinaryOpIC::GetTypeInfo(Object* left, |
| 1704 | Object* right) { |
| 1705 | if (left->IsSmi() && right->IsSmi()) { |
| 1706 | return GENERIC; |
| 1707 | } |
| 1708 | |
| 1709 | if (left->IsNumber() && right->IsNumber()) { |
| 1710 | return HEAP_NUMBERS; |
| 1711 | } |
| 1712 | |
| 1713 | if (left->IsString() || right->IsString()) { |
| 1714 | // Patching for fast string ADD makes sense even if only one of the |
| 1715 | // arguments is a string. |
| 1716 | return STRINGS; |
| 1717 | } |
| 1718 | |
| 1719 | return GENERIC; |
| 1720 | } |
| 1721 | |
| 1722 | |
| 1723 | // defined in codegen-<arch>.cc |
| 1724 | Handle<Code> GetBinaryOpStub(int key, BinaryOpIC::TypeInfo type_info); |
| 1725 | |
| 1726 | |
| 1727 | Object* BinaryOp_Patch(Arguments args) { |
Leon Clarke | ac95265 | 2010-07-15 11:15:24 +0100 | [diff] [blame] | 1728 | ASSERT(args.length() == 5); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 1729 | |
| 1730 | Handle<Object> left = args.at<Object>(0); |
| 1731 | Handle<Object> right = args.at<Object>(1); |
Leon Clarke | ac95265 | 2010-07-15 11:15:24 +0100 | [diff] [blame] | 1732 | int key = Smi::cast(args[2])->value(); |
| 1733 | Token::Value op = static_cast<Token::Value>(Smi::cast(args[3])->value()); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 1734 | #ifdef DEBUG |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 1735 | BinaryOpIC::TypeInfo prev_type_info = |
Leon Clarke | ac95265 | 2010-07-15 11:15:24 +0100 | [diff] [blame] | 1736 | static_cast<BinaryOpIC::TypeInfo>(Smi::cast(args[4])->value()); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 1737 | #endif // DEBUG |
| 1738 | { HandleScope scope; |
| 1739 | BinaryOpIC::TypeInfo type_info = BinaryOpIC::GetTypeInfo(*left, *right); |
| 1740 | Handle<Code> code = GetBinaryOpStub(key, type_info); |
| 1741 | if (!code.is_null()) { |
| 1742 | BinaryOpIC ic; |
| 1743 | ic.patch(*code); |
| 1744 | #ifdef DEBUG |
| 1745 | if (FLAG_trace_ic) { |
| 1746 | PrintF("[BinaryOpIC (%s->%s)#%s]\n", |
| 1747 | BinaryOpIC::GetName(prev_type_info), |
| 1748 | BinaryOpIC::GetName(type_info), |
| 1749 | Token::Name(op)); |
| 1750 | } |
| 1751 | #endif // DEBUG |
| 1752 | } |
| 1753 | } |
| 1754 | |
Leon Clarke | ac95265 | 2010-07-15 11:15:24 +0100 | [diff] [blame] | 1755 | HandleScope scope; |
| 1756 | Handle<JSBuiltinsObject> builtins = Top::builtins(); |
| 1757 | |
| 1758 | Object* builtin = NULL; // Initialization calms down the compiler. |
| 1759 | |
| 1760 | switch (op) { |
| 1761 | case Token::ADD: |
| 1762 | builtin = builtins->javascript_builtin(Builtins::ADD); |
| 1763 | break; |
| 1764 | case Token::SUB: |
| 1765 | builtin = builtins->javascript_builtin(Builtins::SUB); |
| 1766 | break; |
| 1767 | case Token::MUL: |
| 1768 | builtin = builtins->javascript_builtin(Builtins::MUL); |
| 1769 | break; |
| 1770 | case Token::DIV: |
| 1771 | builtin = builtins->javascript_builtin(Builtins::DIV); |
| 1772 | break; |
| 1773 | case Token::MOD: |
| 1774 | builtin = builtins->javascript_builtin(Builtins::MOD); |
| 1775 | break; |
| 1776 | case Token::BIT_AND: |
| 1777 | builtin = builtins->javascript_builtin(Builtins::BIT_AND); |
| 1778 | break; |
| 1779 | case Token::BIT_OR: |
| 1780 | builtin = builtins->javascript_builtin(Builtins::BIT_OR); |
| 1781 | break; |
| 1782 | case Token::BIT_XOR: |
| 1783 | builtin = builtins->javascript_builtin(Builtins::BIT_XOR); |
| 1784 | break; |
| 1785 | case Token::SHR: |
| 1786 | builtin = builtins->javascript_builtin(Builtins::SHR); |
| 1787 | break; |
| 1788 | case Token::SAR: |
| 1789 | builtin = builtins->javascript_builtin(Builtins::SAR); |
| 1790 | break; |
| 1791 | case Token::SHL: |
| 1792 | builtin = builtins->javascript_builtin(Builtins::SHL); |
| 1793 | break; |
| 1794 | default: |
| 1795 | UNREACHABLE(); |
| 1796 | } |
| 1797 | |
| 1798 | Handle<JSFunction> builtin_function(JSFunction::cast(builtin)); |
| 1799 | |
| 1800 | bool caught_exception; |
| 1801 | Object** builtin_args[] = { right.location() }; |
| 1802 | Handle<Object> result = Execution::Call(builtin_function, |
| 1803 | left, |
| 1804 | ARRAY_SIZE(builtin_args), |
| 1805 | builtin_args, |
| 1806 | &caught_exception); |
| 1807 | if (caught_exception) { |
| 1808 | return Failure::Exception(); |
| 1809 | } |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 1810 | return *result; |
| 1811 | } |
| 1812 | |
| 1813 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1814 | static Address IC_utilities[] = { |
| 1815 | #define ADDR(name) FUNCTION_ADDR(name), |
| 1816 | IC_UTIL_LIST(ADDR) |
| 1817 | NULL |
| 1818 | #undef ADDR |
| 1819 | }; |
| 1820 | |
| 1821 | |
| 1822 | Address IC::AddressFromUtilityId(IC::UtilityId id) { |
| 1823 | return IC_utilities[id]; |
| 1824 | } |
| 1825 | |
| 1826 | |
| 1827 | } } // namespace v8::internal |