Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 1 | // Copyright 2012 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "src/v8.h" |
| 6 | |
| 7 | #if V8_TARGET_ARCH_ARM |
| 8 | |
| 9 | #include "src/codegen.h" |
| 10 | #include "src/ic/ic.h" |
| 11 | #include "src/ic/ic-compiler.h" |
| 12 | #include "src/ic/stub-cache.h" |
| 13 | |
| 14 | namespace v8 { |
| 15 | namespace internal { |
| 16 | |
| 17 | |
| 18 | // ---------------------------------------------------------------------------- |
| 19 | // Static IC stub generators. |
| 20 | // |
| 21 | |
| 22 | #define __ ACCESS_MASM(masm) |
| 23 | |
| 24 | |
| 25 | static void GenerateGlobalInstanceTypeCheck(MacroAssembler* masm, Register type, |
| 26 | Label* global_object) { |
| 27 | // Register usage: |
| 28 | // type: holds the receiver instance type on entry. |
| 29 | __ cmp(type, Operand(JS_GLOBAL_OBJECT_TYPE)); |
| 30 | __ b(eq, global_object); |
| 31 | __ cmp(type, Operand(JS_BUILTINS_OBJECT_TYPE)); |
| 32 | __ b(eq, global_object); |
| 33 | __ cmp(type, Operand(JS_GLOBAL_PROXY_TYPE)); |
| 34 | __ b(eq, global_object); |
| 35 | } |
| 36 | |
| 37 | |
| 38 | // Helper function used from LoadIC GenerateNormal. |
| 39 | // |
| 40 | // elements: Property dictionary. It is not clobbered if a jump to the miss |
| 41 | // label is done. |
| 42 | // name: Property name. It is not clobbered if a jump to the miss label is |
| 43 | // done |
| 44 | // result: Register for the result. It is only updated if a jump to the miss |
| 45 | // label is not done. Can be the same as elements or name clobbering |
| 46 | // one of these in the case of not jumping to the miss label. |
| 47 | // The two scratch registers need to be different from elements, name and |
| 48 | // result. |
| 49 | // The generated code assumes that the receiver has slow properties, |
| 50 | // is not a global object and does not have interceptors. |
| 51 | static void GenerateDictionaryLoad(MacroAssembler* masm, Label* miss, |
| 52 | Register elements, Register name, |
| 53 | Register result, Register scratch1, |
| 54 | Register scratch2) { |
| 55 | // Main use of the scratch registers. |
| 56 | // scratch1: Used as temporary and to hold the capacity of the property |
| 57 | // dictionary. |
| 58 | // scratch2: Used as temporary. |
| 59 | Label done; |
| 60 | |
| 61 | // Probe the dictionary. |
| 62 | NameDictionaryLookupStub::GeneratePositiveLookup(masm, miss, &done, elements, |
| 63 | name, scratch1, scratch2); |
| 64 | |
| 65 | // If probing finds an entry check that the value is a normal |
| 66 | // property. |
| 67 | __ bind(&done); // scratch2 == elements + 4 * index |
| 68 | const int kElementsStartOffset = |
| 69 | NameDictionary::kHeaderSize + |
| 70 | NameDictionary::kElementsStartIndex * kPointerSize; |
| 71 | const int kDetailsOffset = kElementsStartOffset + 2 * kPointerSize; |
| 72 | __ ldr(scratch1, FieldMemOperand(scratch2, kDetailsOffset)); |
| 73 | __ tst(scratch1, Operand(PropertyDetails::TypeField::kMask << kSmiTagSize)); |
| 74 | __ b(ne, miss); |
| 75 | |
| 76 | // Get the value at the masked, scaled index and return. |
| 77 | __ ldr(result, |
| 78 | FieldMemOperand(scratch2, kElementsStartOffset + 1 * kPointerSize)); |
| 79 | } |
| 80 | |
| 81 | |
| 82 | // Helper function used from StoreIC::GenerateNormal. |
| 83 | // |
| 84 | // elements: Property dictionary. It is not clobbered if a jump to the miss |
| 85 | // label is done. |
| 86 | // name: Property name. It is not clobbered if a jump to the miss label is |
| 87 | // done |
| 88 | // value: The value to store. |
| 89 | // The two scratch registers need to be different from elements, name and |
| 90 | // result. |
| 91 | // The generated code assumes that the receiver has slow properties, |
| 92 | // is not a global object and does not have interceptors. |
| 93 | static void GenerateDictionaryStore(MacroAssembler* masm, Label* miss, |
| 94 | Register elements, Register name, |
| 95 | Register value, Register scratch1, |
| 96 | Register scratch2) { |
| 97 | // Main use of the scratch registers. |
| 98 | // scratch1: Used as temporary and to hold the capacity of the property |
| 99 | // dictionary. |
| 100 | // scratch2: Used as temporary. |
| 101 | Label done; |
| 102 | |
| 103 | // Probe the dictionary. |
| 104 | NameDictionaryLookupStub::GeneratePositiveLookup(masm, miss, &done, elements, |
| 105 | name, scratch1, scratch2); |
| 106 | |
| 107 | // If probing finds an entry in the dictionary check that the value |
| 108 | // is a normal property that is not read only. |
| 109 | __ bind(&done); // scratch2 == elements + 4 * index |
| 110 | const int kElementsStartOffset = |
| 111 | NameDictionary::kHeaderSize + |
| 112 | NameDictionary::kElementsStartIndex * kPointerSize; |
| 113 | const int kDetailsOffset = kElementsStartOffset + 2 * kPointerSize; |
| 114 | const int kTypeAndReadOnlyMask = |
| 115 | (PropertyDetails::TypeField::kMask | |
| 116 | PropertyDetails::AttributesField::encode(READ_ONLY)) |
| 117 | << kSmiTagSize; |
| 118 | __ ldr(scratch1, FieldMemOperand(scratch2, kDetailsOffset)); |
| 119 | __ tst(scratch1, Operand(kTypeAndReadOnlyMask)); |
| 120 | __ b(ne, miss); |
| 121 | |
| 122 | // Store the value at the masked, scaled index and return. |
| 123 | const int kValueOffset = kElementsStartOffset + kPointerSize; |
| 124 | __ add(scratch2, scratch2, Operand(kValueOffset - kHeapObjectTag)); |
| 125 | __ str(value, MemOperand(scratch2)); |
| 126 | |
| 127 | // Update the write barrier. Make sure not to clobber the value. |
| 128 | __ mov(scratch1, value); |
| 129 | __ RecordWrite(elements, scratch2, scratch1, kLRHasNotBeenSaved, |
| 130 | kDontSaveFPRegs); |
| 131 | } |
| 132 | |
| 133 | |
| 134 | // Checks the receiver for special cases (value type, slow case bits). |
| 135 | // Falls through for regular JS object. |
| 136 | static void GenerateKeyedLoadReceiverCheck(MacroAssembler* masm, |
| 137 | Register receiver, Register map, |
| 138 | Register scratch, |
| 139 | int interceptor_bit, Label* slow) { |
| 140 | // Check that the object isn't a smi. |
| 141 | __ JumpIfSmi(receiver, slow); |
| 142 | // Get the map of the receiver. |
| 143 | __ ldr(map, FieldMemOperand(receiver, HeapObject::kMapOffset)); |
| 144 | // Check bit field. |
| 145 | __ ldrb(scratch, FieldMemOperand(map, Map::kBitFieldOffset)); |
| 146 | __ tst(scratch, |
| 147 | Operand((1 << Map::kIsAccessCheckNeeded) | (1 << interceptor_bit))); |
| 148 | __ b(ne, slow); |
| 149 | // Check that the object is some kind of JS object EXCEPT JS Value type. |
| 150 | // In the case that the object is a value-wrapper object, |
| 151 | // we enter the runtime system to make sure that indexing into string |
| 152 | // objects work as intended. |
| 153 | DCHECK(JS_OBJECT_TYPE > JS_VALUE_TYPE); |
| 154 | __ ldrb(scratch, FieldMemOperand(map, Map::kInstanceTypeOffset)); |
| 155 | __ cmp(scratch, Operand(JS_OBJECT_TYPE)); |
| 156 | __ b(lt, slow); |
| 157 | } |
| 158 | |
| 159 | |
| 160 | // Loads an indexed element from a fast case array. |
| 161 | // If not_fast_array is NULL, doesn't perform the elements map check. |
| 162 | static void GenerateFastArrayLoad(MacroAssembler* masm, Register receiver, |
| 163 | Register key, Register elements, |
| 164 | Register scratch1, Register scratch2, |
| 165 | Register result, Label* not_fast_array, |
| 166 | Label* out_of_range) { |
| 167 | // Register use: |
| 168 | // |
| 169 | // receiver - holds the receiver on entry. |
| 170 | // Unchanged unless 'result' is the same register. |
| 171 | // |
| 172 | // key - holds the smi key on entry. |
| 173 | // Unchanged unless 'result' is the same register. |
| 174 | // |
| 175 | // elements - holds the elements of the receiver on exit. |
| 176 | // |
| 177 | // result - holds the result on exit if the load succeeded. |
| 178 | // Allowed to be the the same as 'receiver' or 'key'. |
| 179 | // Unchanged on bailout so 'receiver' and 'key' can be safely |
| 180 | // used by further computation. |
| 181 | // |
| 182 | // Scratch registers: |
| 183 | // |
| 184 | // scratch1 - used to hold elements map and elements length. |
| 185 | // Holds the elements map if not_fast_array branch is taken. |
| 186 | // |
| 187 | // scratch2 - used to hold the loaded value. |
| 188 | |
| 189 | __ ldr(elements, FieldMemOperand(receiver, JSObject::kElementsOffset)); |
| 190 | if (not_fast_array != NULL) { |
| 191 | // Check that the object is in fast mode and writable. |
| 192 | __ ldr(scratch1, FieldMemOperand(elements, HeapObject::kMapOffset)); |
| 193 | __ LoadRoot(ip, Heap::kFixedArrayMapRootIndex); |
| 194 | __ cmp(scratch1, ip); |
| 195 | __ b(ne, not_fast_array); |
| 196 | } else { |
| 197 | __ AssertFastElements(elements); |
| 198 | } |
| 199 | // Check that the key (index) is within bounds. |
| 200 | __ ldr(scratch1, FieldMemOperand(elements, FixedArray::kLengthOffset)); |
| 201 | __ cmp(key, Operand(scratch1)); |
| 202 | __ b(hs, out_of_range); |
| 203 | // Fast case: Do the load. |
| 204 | __ add(scratch1, elements, Operand(FixedArray::kHeaderSize - kHeapObjectTag)); |
| 205 | __ ldr(scratch2, MemOperand::PointerAddressFromSmiKey(scratch1, key)); |
| 206 | __ LoadRoot(ip, Heap::kTheHoleValueRootIndex); |
| 207 | __ cmp(scratch2, ip); |
| 208 | // In case the loaded value is the_hole we have to consult GetProperty |
| 209 | // to ensure the prototype chain is searched. |
| 210 | __ b(eq, out_of_range); |
| 211 | __ mov(result, scratch2); |
| 212 | } |
| 213 | |
| 214 | |
| 215 | // Checks whether a key is an array index string or a unique name. |
| 216 | // Falls through if a key is a unique name. |
| 217 | static void GenerateKeyNameCheck(MacroAssembler* masm, Register key, |
| 218 | Register map, Register hash, |
| 219 | Label* index_string, Label* not_unique) { |
| 220 | // The key is not a smi. |
| 221 | Label unique; |
| 222 | // Is it a name? |
| 223 | __ CompareObjectType(key, map, hash, LAST_UNIQUE_NAME_TYPE); |
| 224 | __ b(hi, not_unique); |
| 225 | STATIC_ASSERT(LAST_UNIQUE_NAME_TYPE == FIRST_NONSTRING_TYPE); |
| 226 | __ b(eq, &unique); |
| 227 | |
| 228 | // Is the string an array index, with cached numeric value? |
| 229 | __ ldr(hash, FieldMemOperand(key, Name::kHashFieldOffset)); |
| 230 | __ tst(hash, Operand(Name::kContainsCachedArrayIndexMask)); |
| 231 | __ b(eq, index_string); |
| 232 | |
| 233 | // Is the string internalized? We know it's a string, so a single |
| 234 | // bit test is enough. |
| 235 | // map: key map |
| 236 | __ ldrb(hash, FieldMemOperand(map, Map::kInstanceTypeOffset)); |
| 237 | STATIC_ASSERT(kInternalizedTag == 0); |
| 238 | __ tst(hash, Operand(kIsNotInternalizedMask)); |
| 239 | __ b(ne, not_unique); |
| 240 | |
| 241 | __ bind(&unique); |
| 242 | } |
| 243 | |
| 244 | |
| 245 | void LoadIC::GenerateNormal(MacroAssembler* masm) { |
| 246 | Register dictionary = r0; |
| 247 | DCHECK(!dictionary.is(LoadDescriptor::ReceiverRegister())); |
| 248 | DCHECK(!dictionary.is(LoadDescriptor::NameRegister())); |
| 249 | |
| 250 | Label slow; |
| 251 | |
| 252 | __ ldr(dictionary, FieldMemOperand(LoadDescriptor::ReceiverRegister(), |
| 253 | JSObject::kPropertiesOffset)); |
| 254 | GenerateDictionaryLoad(masm, &slow, dictionary, |
| 255 | LoadDescriptor::NameRegister(), r0, r3, r4); |
| 256 | __ Ret(); |
| 257 | |
| 258 | // Dictionary load failed, go slow (but don't miss). |
| 259 | __ bind(&slow); |
| 260 | GenerateRuntimeGetProperty(masm); |
| 261 | } |
| 262 | |
| 263 | |
| 264 | // A register that isn't one of the parameters to the load ic. |
| 265 | static const Register LoadIC_TempRegister() { return r3; } |
| 266 | |
| 267 | |
| 268 | void LoadIC::GenerateMiss(MacroAssembler* masm) { |
| 269 | // The return address is in lr. |
| 270 | Isolate* isolate = masm->isolate(); |
| 271 | |
| 272 | __ IncrementCounter(isolate->counters()->load_miss(), 1, r3, r4); |
| 273 | |
| 274 | __ mov(LoadIC_TempRegister(), LoadDescriptor::ReceiverRegister()); |
| 275 | __ Push(LoadIC_TempRegister(), LoadDescriptor::NameRegister()); |
| 276 | |
| 277 | // Perform tail call to the entry. |
| 278 | ExternalReference ref = ExternalReference(IC_Utility(kLoadIC_Miss), isolate); |
| 279 | __ TailCallExternalReference(ref, 2, 1); |
| 280 | } |
| 281 | |
| 282 | |
| 283 | void LoadIC::GenerateRuntimeGetProperty(MacroAssembler* masm) { |
| 284 | // The return address is in lr. |
| 285 | |
| 286 | __ mov(LoadIC_TempRegister(), LoadDescriptor::ReceiverRegister()); |
| 287 | __ Push(LoadIC_TempRegister(), LoadDescriptor::NameRegister()); |
| 288 | |
| 289 | __ TailCallRuntime(Runtime::kGetProperty, 2, 1); |
| 290 | } |
| 291 | |
| 292 | |
| 293 | static MemOperand GenerateMappedArgumentsLookup( |
| 294 | MacroAssembler* masm, Register object, Register key, Register scratch1, |
| 295 | Register scratch2, Register scratch3, Label* unmapped_case, |
| 296 | Label* slow_case) { |
| 297 | Heap* heap = masm->isolate()->heap(); |
| 298 | |
| 299 | // Check that the receiver is a JSObject. Because of the map check |
| 300 | // later, we do not need to check for interceptors or whether it |
| 301 | // requires access checks. |
| 302 | __ JumpIfSmi(object, slow_case); |
| 303 | // Check that the object is some kind of JSObject. |
| 304 | __ CompareObjectType(object, scratch1, scratch2, FIRST_JS_RECEIVER_TYPE); |
| 305 | __ b(lt, slow_case); |
| 306 | |
| 307 | // Check that the key is a positive smi. |
| 308 | __ tst(key, Operand(0x80000001)); |
| 309 | __ b(ne, slow_case); |
| 310 | |
| 311 | // Load the elements into scratch1 and check its map. |
| 312 | Handle<Map> arguments_map(heap->sloppy_arguments_elements_map()); |
| 313 | __ ldr(scratch1, FieldMemOperand(object, JSObject::kElementsOffset)); |
| 314 | __ CheckMap(scratch1, scratch2, arguments_map, slow_case, DONT_DO_SMI_CHECK); |
| 315 | |
| 316 | // Check if element is in the range of mapped arguments. If not, jump |
| 317 | // to the unmapped lookup with the parameter map in scratch1. |
| 318 | __ ldr(scratch2, FieldMemOperand(scratch1, FixedArray::kLengthOffset)); |
| 319 | __ sub(scratch2, scratch2, Operand(Smi::FromInt(2))); |
| 320 | __ cmp(key, Operand(scratch2)); |
| 321 | __ b(cs, unmapped_case); |
| 322 | |
| 323 | // Load element index and check whether it is the hole. |
| 324 | const int kOffset = |
| 325 | FixedArray::kHeaderSize + 2 * kPointerSize - kHeapObjectTag; |
| 326 | |
| 327 | __ mov(scratch3, Operand(kPointerSize >> 1)); |
| 328 | __ mul(scratch3, key, scratch3); |
| 329 | __ add(scratch3, scratch3, Operand(kOffset)); |
| 330 | |
| 331 | __ ldr(scratch2, MemOperand(scratch1, scratch3)); |
| 332 | __ LoadRoot(scratch3, Heap::kTheHoleValueRootIndex); |
| 333 | __ cmp(scratch2, scratch3); |
| 334 | __ b(eq, unmapped_case); |
| 335 | |
| 336 | // Load value from context and return it. We can reuse scratch1 because |
| 337 | // we do not jump to the unmapped lookup (which requires the parameter |
| 338 | // map in scratch1). |
| 339 | __ ldr(scratch1, FieldMemOperand(scratch1, FixedArray::kHeaderSize)); |
| 340 | __ mov(scratch3, Operand(kPointerSize >> 1)); |
| 341 | __ mul(scratch3, scratch2, scratch3); |
| 342 | __ add(scratch3, scratch3, Operand(Context::kHeaderSize - kHeapObjectTag)); |
| 343 | return MemOperand(scratch1, scratch3); |
| 344 | } |
| 345 | |
| 346 | |
| 347 | static MemOperand GenerateUnmappedArgumentsLookup(MacroAssembler* masm, |
| 348 | Register key, |
| 349 | Register parameter_map, |
| 350 | Register scratch, |
| 351 | Label* slow_case) { |
| 352 | // Element is in arguments backing store, which is referenced by the |
| 353 | // second element of the parameter_map. The parameter_map register |
| 354 | // must be loaded with the parameter map of the arguments object and is |
| 355 | // overwritten. |
| 356 | const int kBackingStoreOffset = FixedArray::kHeaderSize + kPointerSize; |
| 357 | Register backing_store = parameter_map; |
| 358 | __ ldr(backing_store, FieldMemOperand(parameter_map, kBackingStoreOffset)); |
| 359 | Handle<Map> fixed_array_map(masm->isolate()->heap()->fixed_array_map()); |
| 360 | __ CheckMap(backing_store, scratch, fixed_array_map, slow_case, |
| 361 | DONT_DO_SMI_CHECK); |
| 362 | __ ldr(scratch, FieldMemOperand(backing_store, FixedArray::kLengthOffset)); |
| 363 | __ cmp(key, Operand(scratch)); |
| 364 | __ b(cs, slow_case); |
| 365 | __ mov(scratch, Operand(kPointerSize >> 1)); |
| 366 | __ mul(scratch, key, scratch); |
| 367 | __ add(scratch, scratch, Operand(FixedArray::kHeaderSize - kHeapObjectTag)); |
| 368 | return MemOperand(backing_store, scratch); |
| 369 | } |
| 370 | |
| 371 | |
| 372 | void KeyedStoreIC::GenerateSloppyArguments(MacroAssembler* masm) { |
| 373 | Register receiver = StoreDescriptor::ReceiverRegister(); |
| 374 | Register key = StoreDescriptor::NameRegister(); |
| 375 | Register value = StoreDescriptor::ValueRegister(); |
| 376 | DCHECK(receiver.is(r1)); |
| 377 | DCHECK(key.is(r2)); |
| 378 | DCHECK(value.is(r0)); |
| 379 | |
| 380 | Label slow, notin; |
| 381 | MemOperand mapped_location = GenerateMappedArgumentsLookup( |
| 382 | masm, receiver, key, r3, r4, r5, ¬in, &slow); |
| 383 | __ str(value, mapped_location); |
| 384 | __ add(r6, r3, r5); |
| 385 | __ mov(r9, value); |
| 386 | __ RecordWrite(r3, r6, r9, kLRHasNotBeenSaved, kDontSaveFPRegs); |
| 387 | __ Ret(); |
| 388 | __ bind(¬in); |
| 389 | // The unmapped lookup expects that the parameter map is in r3. |
| 390 | MemOperand unmapped_location = |
| 391 | GenerateUnmappedArgumentsLookup(masm, key, r3, r4, &slow); |
| 392 | __ str(value, unmapped_location); |
| 393 | __ add(r6, r3, r4); |
| 394 | __ mov(r9, value); |
| 395 | __ RecordWrite(r3, r6, r9, kLRHasNotBeenSaved, kDontSaveFPRegs); |
| 396 | __ Ret(); |
| 397 | __ bind(&slow); |
| 398 | GenerateMiss(masm); |
| 399 | } |
| 400 | |
| 401 | |
| 402 | void KeyedLoadIC::GenerateMiss(MacroAssembler* masm) { |
| 403 | // The return address is in lr. |
| 404 | Isolate* isolate = masm->isolate(); |
| 405 | |
| 406 | __ IncrementCounter(isolate->counters()->keyed_load_miss(), 1, r3, r4); |
| 407 | |
| 408 | __ Push(LoadDescriptor::ReceiverRegister(), LoadDescriptor::NameRegister()); |
| 409 | |
| 410 | // Perform tail call to the entry. |
| 411 | ExternalReference ref = |
| 412 | ExternalReference(IC_Utility(kKeyedLoadIC_Miss), isolate); |
| 413 | |
| 414 | __ TailCallExternalReference(ref, 2, 1); |
| 415 | } |
| 416 | |
| 417 | |
| 418 | void KeyedLoadIC::GenerateRuntimeGetProperty(MacroAssembler* masm) { |
| 419 | // The return address is in lr. |
| 420 | |
| 421 | __ Push(LoadDescriptor::ReceiverRegister(), LoadDescriptor::NameRegister()); |
| 422 | |
| 423 | __ TailCallRuntime(Runtime::kKeyedGetProperty, 2, 1); |
| 424 | } |
| 425 | |
| 426 | |
| 427 | void KeyedLoadIC::GenerateGeneric(MacroAssembler* masm) { |
| 428 | // The return address is in lr. |
| 429 | Label slow, check_name, index_smi, index_name, property_array_property; |
| 430 | Label probe_dictionary, check_number_dictionary; |
| 431 | |
| 432 | Register key = LoadDescriptor::NameRegister(); |
| 433 | Register receiver = LoadDescriptor::ReceiverRegister(); |
| 434 | DCHECK(key.is(r2)); |
| 435 | DCHECK(receiver.is(r1)); |
| 436 | |
| 437 | Isolate* isolate = masm->isolate(); |
| 438 | |
| 439 | // Check that the key is a smi. |
| 440 | __ JumpIfNotSmi(key, &check_name); |
| 441 | __ bind(&index_smi); |
| 442 | // Now the key is known to be a smi. This place is also jumped to from below |
| 443 | // where a numeric string is converted to a smi. |
| 444 | |
| 445 | GenerateKeyedLoadReceiverCheck(masm, receiver, r0, r3, |
| 446 | Map::kHasIndexedInterceptor, &slow); |
| 447 | |
| 448 | // Check the receiver's map to see if it has fast elements. |
| 449 | __ CheckFastElements(r0, r3, &check_number_dictionary); |
| 450 | |
| 451 | GenerateFastArrayLoad(masm, receiver, key, r0, r3, r4, r0, NULL, &slow); |
| 452 | __ IncrementCounter(isolate->counters()->keyed_load_generic_smi(), 1, r4, r3); |
| 453 | __ Ret(); |
| 454 | |
| 455 | __ bind(&check_number_dictionary); |
| 456 | __ ldr(r4, FieldMemOperand(receiver, JSObject::kElementsOffset)); |
| 457 | __ ldr(r3, FieldMemOperand(r4, JSObject::kMapOffset)); |
| 458 | |
| 459 | // Check whether the elements is a number dictionary. |
| 460 | // r3: elements map |
| 461 | // r4: elements |
| 462 | __ LoadRoot(ip, Heap::kHashTableMapRootIndex); |
| 463 | __ cmp(r3, ip); |
| 464 | __ b(ne, &slow); |
| 465 | __ SmiUntag(r0, key); |
| 466 | __ LoadFromNumberDictionary(&slow, r4, key, r0, r0, r3, r5); |
| 467 | __ Ret(); |
| 468 | |
| 469 | // Slow case, key and receiver still in r2 and r1. |
| 470 | __ bind(&slow); |
| 471 | __ IncrementCounter(isolate->counters()->keyed_load_generic_slow(), 1, r4, |
| 472 | r3); |
| 473 | GenerateRuntimeGetProperty(masm); |
| 474 | |
| 475 | __ bind(&check_name); |
| 476 | GenerateKeyNameCheck(masm, key, r0, r3, &index_name, &slow); |
| 477 | |
| 478 | GenerateKeyedLoadReceiverCheck(masm, receiver, r0, r3, |
| 479 | Map::kHasNamedInterceptor, &slow); |
| 480 | |
| 481 | // If the receiver is a fast-case object, check the keyed lookup |
| 482 | // cache. Otherwise probe the dictionary. |
| 483 | __ ldr(r3, FieldMemOperand(receiver, JSObject::kPropertiesOffset)); |
| 484 | __ ldr(r4, FieldMemOperand(r3, HeapObject::kMapOffset)); |
| 485 | __ LoadRoot(ip, Heap::kHashTableMapRootIndex); |
| 486 | __ cmp(r4, ip); |
| 487 | __ b(eq, &probe_dictionary); |
| 488 | |
| 489 | // Load the map of the receiver, compute the keyed lookup cache hash |
| 490 | // based on 32 bits of the map pointer and the name hash. |
| 491 | __ ldr(r0, FieldMemOperand(receiver, HeapObject::kMapOffset)); |
| 492 | __ mov(r3, Operand(r0, ASR, KeyedLookupCache::kMapHashShift)); |
| 493 | __ ldr(r4, FieldMemOperand(key, Name::kHashFieldOffset)); |
| 494 | __ eor(r3, r3, Operand(r4, ASR, Name::kHashShift)); |
| 495 | int mask = KeyedLookupCache::kCapacityMask & KeyedLookupCache::kHashMask; |
| 496 | __ And(r3, r3, Operand(mask)); |
| 497 | |
| 498 | // Load the key (consisting of map and unique name) from the cache and |
| 499 | // check for match. |
| 500 | Label load_in_object_property; |
| 501 | static const int kEntriesPerBucket = KeyedLookupCache::kEntriesPerBucket; |
| 502 | Label hit_on_nth_entry[kEntriesPerBucket]; |
| 503 | ExternalReference cache_keys = |
| 504 | ExternalReference::keyed_lookup_cache_keys(isolate); |
| 505 | |
| 506 | __ mov(r4, Operand(cache_keys)); |
| 507 | __ add(r4, r4, Operand(r3, LSL, kPointerSizeLog2 + 1)); |
| 508 | |
| 509 | for (int i = 0; i < kEntriesPerBucket - 1; i++) { |
| 510 | Label try_next_entry; |
| 511 | // Load map and move r4 to next entry. |
| 512 | __ ldr(r5, MemOperand(r4, kPointerSize * 2, PostIndex)); |
| 513 | __ cmp(r0, r5); |
| 514 | __ b(ne, &try_next_entry); |
| 515 | __ ldr(r5, MemOperand(r4, -kPointerSize)); // Load name |
| 516 | __ cmp(key, r5); |
| 517 | __ b(eq, &hit_on_nth_entry[i]); |
| 518 | __ bind(&try_next_entry); |
| 519 | } |
| 520 | |
| 521 | // Last entry: Load map and move r4 to name. |
| 522 | __ ldr(r5, MemOperand(r4, kPointerSize, PostIndex)); |
| 523 | __ cmp(r0, r5); |
| 524 | __ b(ne, &slow); |
| 525 | __ ldr(r5, MemOperand(r4)); |
| 526 | __ cmp(key, r5); |
| 527 | __ b(ne, &slow); |
| 528 | |
| 529 | // Get field offset. |
| 530 | // r0 : receiver's map |
| 531 | // r3 : lookup cache index |
| 532 | ExternalReference cache_field_offsets = |
| 533 | ExternalReference::keyed_lookup_cache_field_offsets(isolate); |
| 534 | |
| 535 | // Hit on nth entry. |
| 536 | for (int i = kEntriesPerBucket - 1; i >= 0; i--) { |
| 537 | __ bind(&hit_on_nth_entry[i]); |
| 538 | __ mov(r4, Operand(cache_field_offsets)); |
| 539 | if (i != 0) { |
| 540 | __ add(r3, r3, Operand(i)); |
| 541 | } |
| 542 | __ ldr(r5, MemOperand(r4, r3, LSL, kPointerSizeLog2)); |
| 543 | __ ldrb(r6, FieldMemOperand(r0, Map::kInObjectPropertiesOffset)); |
| 544 | __ sub(r5, r5, r6, SetCC); |
| 545 | __ b(ge, &property_array_property); |
| 546 | if (i != 0) { |
| 547 | __ jmp(&load_in_object_property); |
| 548 | } |
| 549 | } |
| 550 | |
| 551 | // Load in-object property. |
| 552 | __ bind(&load_in_object_property); |
| 553 | __ ldrb(r6, FieldMemOperand(r0, Map::kInstanceSizeOffset)); |
| 554 | __ add(r6, r6, r5); // Index from start of object. |
| 555 | __ sub(receiver, receiver, Operand(kHeapObjectTag)); // Remove the heap tag. |
| 556 | __ ldr(r0, MemOperand(receiver, r6, LSL, kPointerSizeLog2)); |
| 557 | __ IncrementCounter(isolate->counters()->keyed_load_generic_lookup_cache(), 1, |
| 558 | r4, r3); |
| 559 | __ Ret(); |
| 560 | |
| 561 | // Load property array property. |
| 562 | __ bind(&property_array_property); |
| 563 | __ ldr(receiver, FieldMemOperand(receiver, JSObject::kPropertiesOffset)); |
| 564 | __ add(receiver, receiver, Operand(FixedArray::kHeaderSize - kHeapObjectTag)); |
| 565 | __ ldr(r0, MemOperand(receiver, r5, LSL, kPointerSizeLog2)); |
| 566 | __ IncrementCounter(isolate->counters()->keyed_load_generic_lookup_cache(), 1, |
| 567 | r4, r3); |
| 568 | __ Ret(); |
| 569 | |
| 570 | // Do a quick inline probe of the receiver's dictionary, if it |
| 571 | // exists. |
| 572 | __ bind(&probe_dictionary); |
| 573 | // r3: elements |
| 574 | __ ldr(r0, FieldMemOperand(receiver, HeapObject::kMapOffset)); |
| 575 | __ ldrb(r0, FieldMemOperand(r0, Map::kInstanceTypeOffset)); |
| 576 | GenerateGlobalInstanceTypeCheck(masm, r0, &slow); |
| 577 | // Load the property to r0. |
| 578 | GenerateDictionaryLoad(masm, &slow, r3, key, r0, r5, r4); |
| 579 | __ IncrementCounter(isolate->counters()->keyed_load_generic_symbol(), 1, r4, |
| 580 | r3); |
| 581 | __ Ret(); |
| 582 | |
| 583 | __ bind(&index_name); |
| 584 | __ IndexFromHash(r3, key); |
| 585 | // Now jump to the place where smi keys are handled. |
| 586 | __ jmp(&index_smi); |
| 587 | } |
| 588 | |
| 589 | |
| 590 | void KeyedLoadIC::GenerateString(MacroAssembler* masm) { |
| 591 | // Return address is in lr. |
| 592 | Label miss; |
| 593 | |
| 594 | Register receiver = LoadDescriptor::ReceiverRegister(); |
| 595 | Register index = LoadDescriptor::NameRegister(); |
| 596 | Register scratch = r3; |
| 597 | Register result = r0; |
| 598 | DCHECK(!scratch.is(receiver) && !scratch.is(index)); |
| 599 | |
| 600 | StringCharAtGenerator char_at_generator(receiver, index, scratch, result, |
| 601 | &miss, // When not a string. |
| 602 | &miss, // When not a number. |
| 603 | &miss, // When index out of range. |
| 604 | STRING_INDEX_IS_ARRAY_INDEX); |
| 605 | char_at_generator.GenerateFast(masm); |
| 606 | __ Ret(); |
| 607 | |
| 608 | StubRuntimeCallHelper call_helper; |
| 609 | char_at_generator.GenerateSlow(masm, call_helper); |
| 610 | |
| 611 | __ bind(&miss); |
| 612 | GenerateMiss(masm); |
| 613 | } |
| 614 | |
| 615 | |
| 616 | void KeyedStoreIC::GenerateMiss(MacroAssembler* masm) { |
| 617 | // Push receiver, key and value for runtime call. |
| 618 | __ Push(StoreDescriptor::ReceiverRegister(), StoreDescriptor::NameRegister(), |
| 619 | StoreDescriptor::ValueRegister()); |
| 620 | |
| 621 | ExternalReference ref = |
| 622 | ExternalReference(IC_Utility(kKeyedStoreIC_Miss), masm->isolate()); |
| 623 | __ TailCallExternalReference(ref, 3, 1); |
| 624 | } |
| 625 | |
| 626 | |
| 627 | static void KeyedStoreGenerateGenericHelper( |
| 628 | MacroAssembler* masm, Label* fast_object, Label* fast_double, Label* slow, |
| 629 | KeyedStoreCheckMap check_map, KeyedStoreIncrementLength increment_length, |
| 630 | Register value, Register key, Register receiver, Register receiver_map, |
| 631 | Register elements_map, Register elements) { |
| 632 | Label transition_smi_elements; |
| 633 | Label finish_object_store, non_double_value, transition_double_elements; |
| 634 | Label fast_double_without_map_check; |
| 635 | |
| 636 | // Fast case: Do the store, could be either Object or double. |
| 637 | __ bind(fast_object); |
| 638 | Register scratch_value = r4; |
| 639 | Register address = r5; |
| 640 | if (check_map == kCheckMap) { |
| 641 | __ ldr(elements_map, FieldMemOperand(elements, HeapObject::kMapOffset)); |
| 642 | __ cmp(elements_map, |
| 643 | Operand(masm->isolate()->factory()->fixed_array_map())); |
| 644 | __ b(ne, fast_double); |
| 645 | } |
| 646 | |
| 647 | // HOLECHECK: guards "A[i] = V" |
| 648 | // We have to go to the runtime if the current value is the hole because |
| 649 | // there may be a callback on the element |
| 650 | Label holecheck_passed1; |
| 651 | __ add(address, elements, Operand(FixedArray::kHeaderSize - kHeapObjectTag)); |
| 652 | __ ldr(scratch_value, |
| 653 | MemOperand::PointerAddressFromSmiKey(address, key, PreIndex)); |
| 654 | __ cmp(scratch_value, Operand(masm->isolate()->factory()->the_hole_value())); |
| 655 | __ b(ne, &holecheck_passed1); |
| 656 | __ JumpIfDictionaryInPrototypeChain(receiver, elements_map, scratch_value, |
| 657 | slow); |
| 658 | |
| 659 | __ bind(&holecheck_passed1); |
| 660 | |
| 661 | // Smi stores don't require further checks. |
| 662 | Label non_smi_value; |
| 663 | __ JumpIfNotSmi(value, &non_smi_value); |
| 664 | |
| 665 | if (increment_length == kIncrementLength) { |
| 666 | // Add 1 to receiver->length. |
| 667 | __ add(scratch_value, key, Operand(Smi::FromInt(1))); |
| 668 | __ str(scratch_value, FieldMemOperand(receiver, JSArray::kLengthOffset)); |
| 669 | } |
| 670 | // It's irrelevant whether array is smi-only or not when writing a smi. |
| 671 | __ add(address, elements, Operand(FixedArray::kHeaderSize - kHeapObjectTag)); |
| 672 | __ str(value, MemOperand::PointerAddressFromSmiKey(address, key)); |
| 673 | __ Ret(); |
| 674 | |
| 675 | __ bind(&non_smi_value); |
| 676 | // Escape to elements kind transition case. |
| 677 | __ CheckFastObjectElements(receiver_map, scratch_value, |
| 678 | &transition_smi_elements); |
| 679 | |
| 680 | // Fast elements array, store the value to the elements backing store. |
| 681 | __ bind(&finish_object_store); |
| 682 | if (increment_length == kIncrementLength) { |
| 683 | // Add 1 to receiver->length. |
| 684 | __ add(scratch_value, key, Operand(Smi::FromInt(1))); |
| 685 | __ str(scratch_value, FieldMemOperand(receiver, JSArray::kLengthOffset)); |
| 686 | } |
| 687 | __ add(address, elements, Operand(FixedArray::kHeaderSize - kHeapObjectTag)); |
| 688 | __ add(address, address, Operand::PointerOffsetFromSmiKey(key)); |
| 689 | __ str(value, MemOperand(address)); |
| 690 | // Update write barrier for the elements array address. |
| 691 | __ mov(scratch_value, value); // Preserve the value which is returned. |
| 692 | __ RecordWrite(elements, address, scratch_value, kLRHasNotBeenSaved, |
| 693 | kDontSaveFPRegs, EMIT_REMEMBERED_SET, OMIT_SMI_CHECK); |
| 694 | __ Ret(); |
| 695 | |
| 696 | __ bind(fast_double); |
| 697 | if (check_map == kCheckMap) { |
| 698 | // Check for fast double array case. If this fails, call through to the |
| 699 | // runtime. |
| 700 | __ CompareRoot(elements_map, Heap::kFixedDoubleArrayMapRootIndex); |
| 701 | __ b(ne, slow); |
| 702 | } |
| 703 | |
| 704 | // HOLECHECK: guards "A[i] double hole?" |
| 705 | // We have to see if the double version of the hole is present. If so |
| 706 | // go to the runtime. |
| 707 | __ add(address, elements, |
| 708 | Operand((FixedDoubleArray::kHeaderSize + sizeof(kHoleNanLower32)) - |
| 709 | kHeapObjectTag)); |
| 710 | __ ldr(scratch_value, |
| 711 | MemOperand(address, key, LSL, kPointerSizeLog2, PreIndex)); |
| 712 | __ cmp(scratch_value, Operand(kHoleNanUpper32)); |
| 713 | __ b(ne, &fast_double_without_map_check); |
| 714 | __ JumpIfDictionaryInPrototypeChain(receiver, elements_map, scratch_value, |
| 715 | slow); |
| 716 | |
| 717 | __ bind(&fast_double_without_map_check); |
| 718 | __ StoreNumberToDoubleElements(value, key, elements, r3, d0, |
| 719 | &transition_double_elements); |
| 720 | if (increment_length == kIncrementLength) { |
| 721 | // Add 1 to receiver->length. |
| 722 | __ add(scratch_value, key, Operand(Smi::FromInt(1))); |
| 723 | __ str(scratch_value, FieldMemOperand(receiver, JSArray::kLengthOffset)); |
| 724 | } |
| 725 | __ Ret(); |
| 726 | |
| 727 | __ bind(&transition_smi_elements); |
| 728 | // Transition the array appropriately depending on the value type. |
| 729 | __ ldr(r4, FieldMemOperand(value, HeapObject::kMapOffset)); |
| 730 | __ CompareRoot(r4, Heap::kHeapNumberMapRootIndex); |
| 731 | __ b(ne, &non_double_value); |
| 732 | |
| 733 | // Value is a double. Transition FAST_SMI_ELEMENTS -> |
| 734 | // FAST_DOUBLE_ELEMENTS and complete the store. |
| 735 | __ LoadTransitionedArrayMapConditional( |
| 736 | FAST_SMI_ELEMENTS, FAST_DOUBLE_ELEMENTS, receiver_map, r4, slow); |
| 737 | AllocationSiteMode mode = |
| 738 | AllocationSite::GetMode(FAST_SMI_ELEMENTS, FAST_DOUBLE_ELEMENTS); |
| 739 | ElementsTransitionGenerator::GenerateSmiToDouble(masm, receiver, key, value, |
| 740 | receiver_map, mode, slow); |
| 741 | __ ldr(elements, FieldMemOperand(receiver, JSObject::kElementsOffset)); |
| 742 | __ jmp(&fast_double_without_map_check); |
| 743 | |
| 744 | __ bind(&non_double_value); |
| 745 | // Value is not a double, FAST_SMI_ELEMENTS -> FAST_ELEMENTS |
| 746 | __ LoadTransitionedArrayMapConditional(FAST_SMI_ELEMENTS, FAST_ELEMENTS, |
| 747 | receiver_map, r4, slow); |
| 748 | mode = AllocationSite::GetMode(FAST_SMI_ELEMENTS, FAST_ELEMENTS); |
| 749 | ElementsTransitionGenerator::GenerateMapChangeElementsTransition( |
| 750 | masm, receiver, key, value, receiver_map, mode, slow); |
| 751 | __ ldr(elements, FieldMemOperand(receiver, JSObject::kElementsOffset)); |
| 752 | __ jmp(&finish_object_store); |
| 753 | |
| 754 | __ bind(&transition_double_elements); |
| 755 | // Elements are FAST_DOUBLE_ELEMENTS, but value is an Object that's not a |
| 756 | // HeapNumber. Make sure that the receiver is a Array with FAST_ELEMENTS and |
| 757 | // transition array from FAST_DOUBLE_ELEMENTS to FAST_ELEMENTS |
| 758 | __ LoadTransitionedArrayMapConditional(FAST_DOUBLE_ELEMENTS, FAST_ELEMENTS, |
| 759 | receiver_map, r4, slow); |
| 760 | mode = AllocationSite::GetMode(FAST_DOUBLE_ELEMENTS, FAST_ELEMENTS); |
| 761 | ElementsTransitionGenerator::GenerateDoubleToObject( |
| 762 | masm, receiver, key, value, receiver_map, mode, slow); |
| 763 | __ ldr(elements, FieldMemOperand(receiver, JSObject::kElementsOffset)); |
| 764 | __ jmp(&finish_object_store); |
| 765 | } |
| 766 | |
| 767 | |
| 768 | void KeyedStoreIC::GenerateGeneric(MacroAssembler* masm, |
| 769 | StrictMode strict_mode) { |
| 770 | // ---------- S t a t e -------------- |
| 771 | // -- r0 : value |
| 772 | // -- r1 : key |
| 773 | // -- r2 : receiver |
| 774 | // -- lr : return address |
| 775 | // ----------------------------------- |
| 776 | Label slow, fast_object, fast_object_grow; |
| 777 | Label fast_double, fast_double_grow; |
| 778 | Label array, extra, check_if_double_array; |
| 779 | |
| 780 | // Register usage. |
| 781 | Register value = StoreDescriptor::ValueRegister(); |
| 782 | Register key = StoreDescriptor::NameRegister(); |
| 783 | Register receiver = StoreDescriptor::ReceiverRegister(); |
| 784 | DCHECK(receiver.is(r1)); |
| 785 | DCHECK(key.is(r2)); |
| 786 | DCHECK(value.is(r0)); |
| 787 | Register receiver_map = r3; |
| 788 | Register elements_map = r6; |
| 789 | Register elements = r9; // Elements array of the receiver. |
| 790 | // r4 and r5 are used as general scratch registers. |
| 791 | |
| 792 | // Check that the key is a smi. |
| 793 | __ JumpIfNotSmi(key, &slow); |
| 794 | // Check that the object isn't a smi. |
| 795 | __ JumpIfSmi(receiver, &slow); |
| 796 | // Get the map of the object. |
| 797 | __ ldr(receiver_map, FieldMemOperand(receiver, HeapObject::kMapOffset)); |
| 798 | // Check that the receiver does not require access checks and is not observed. |
| 799 | // The generic stub does not perform map checks or handle observed objects. |
| 800 | __ ldrb(ip, FieldMemOperand(receiver_map, Map::kBitFieldOffset)); |
| 801 | __ tst(ip, Operand(1 << Map::kIsAccessCheckNeeded | 1 << Map::kIsObserved)); |
| 802 | __ b(ne, &slow); |
| 803 | // Check if the object is a JS array or not. |
| 804 | __ ldrb(r4, FieldMemOperand(receiver_map, Map::kInstanceTypeOffset)); |
| 805 | __ cmp(r4, Operand(JS_ARRAY_TYPE)); |
| 806 | __ b(eq, &array); |
| 807 | // Check that the object is some kind of JSObject. |
| 808 | __ cmp(r4, Operand(FIRST_JS_OBJECT_TYPE)); |
| 809 | __ b(lt, &slow); |
| 810 | |
| 811 | // Object case: Check key against length in the elements array. |
| 812 | __ ldr(elements, FieldMemOperand(receiver, JSObject::kElementsOffset)); |
| 813 | // Check array bounds. Both the key and the length of FixedArray are smis. |
| 814 | __ ldr(ip, FieldMemOperand(elements, FixedArray::kLengthOffset)); |
| 815 | __ cmp(key, Operand(ip)); |
| 816 | __ b(lo, &fast_object); |
| 817 | |
| 818 | // Slow case, handle jump to runtime. |
| 819 | __ bind(&slow); |
| 820 | // Entry registers are intact. |
| 821 | // r0: value. |
| 822 | // r1: key. |
| 823 | // r2: receiver. |
| 824 | PropertyICCompiler::GenerateRuntimeSetProperty(masm, strict_mode); |
| 825 | |
| 826 | // Extra capacity case: Check if there is extra capacity to |
| 827 | // perform the store and update the length. Used for adding one |
| 828 | // element to the array by writing to array[array.length]. |
| 829 | __ bind(&extra); |
| 830 | // Condition code from comparing key and array length is still available. |
| 831 | __ b(ne, &slow); // Only support writing to writing to array[array.length]. |
| 832 | // Check for room in the elements backing store. |
| 833 | // Both the key and the length of FixedArray are smis. |
| 834 | __ ldr(ip, FieldMemOperand(elements, FixedArray::kLengthOffset)); |
| 835 | __ cmp(key, Operand(ip)); |
| 836 | __ b(hs, &slow); |
| 837 | __ ldr(elements_map, FieldMemOperand(elements, HeapObject::kMapOffset)); |
| 838 | __ cmp(elements_map, Operand(masm->isolate()->factory()->fixed_array_map())); |
| 839 | __ b(ne, &check_if_double_array); |
| 840 | __ jmp(&fast_object_grow); |
| 841 | |
| 842 | __ bind(&check_if_double_array); |
| 843 | __ cmp(elements_map, |
| 844 | Operand(masm->isolate()->factory()->fixed_double_array_map())); |
| 845 | __ b(ne, &slow); |
| 846 | __ jmp(&fast_double_grow); |
| 847 | |
| 848 | // Array case: Get the length and the elements array from the JS |
| 849 | // array. Check that the array is in fast mode (and writable); if it |
| 850 | // is the length is always a smi. |
| 851 | __ bind(&array); |
| 852 | __ ldr(elements, FieldMemOperand(receiver, JSObject::kElementsOffset)); |
| 853 | |
| 854 | // Check the key against the length in the array. |
| 855 | __ ldr(ip, FieldMemOperand(receiver, JSArray::kLengthOffset)); |
| 856 | __ cmp(key, Operand(ip)); |
| 857 | __ b(hs, &extra); |
| 858 | |
| 859 | KeyedStoreGenerateGenericHelper( |
| 860 | masm, &fast_object, &fast_double, &slow, kCheckMap, kDontIncrementLength, |
| 861 | value, key, receiver, receiver_map, elements_map, elements); |
| 862 | KeyedStoreGenerateGenericHelper(masm, &fast_object_grow, &fast_double_grow, |
| 863 | &slow, kDontCheckMap, kIncrementLength, value, |
| 864 | key, receiver, receiver_map, elements_map, |
| 865 | elements); |
| 866 | } |
| 867 | |
| 868 | |
| 869 | void StoreIC::GenerateMegamorphic(MacroAssembler* masm) { |
| 870 | Register receiver = StoreDescriptor::ReceiverRegister(); |
| 871 | Register name = StoreDescriptor::NameRegister(); |
| 872 | DCHECK(receiver.is(r1)); |
| 873 | DCHECK(name.is(r2)); |
| 874 | DCHECK(StoreDescriptor::ValueRegister().is(r0)); |
| 875 | |
| 876 | // Get the receiver from the stack and probe the stub cache. |
| 877 | Code::Flags flags = Code::RemoveTypeAndHolderFromFlags( |
| 878 | Code::ComputeHandlerFlags(Code::STORE_IC)); |
| 879 | |
| 880 | masm->isolate()->stub_cache()->GenerateProbe(masm, flags, false, receiver, |
| 881 | name, r3, r4, r5, r6); |
| 882 | |
| 883 | // Cache miss: Jump to runtime. |
| 884 | GenerateMiss(masm); |
| 885 | } |
| 886 | |
| 887 | |
| 888 | void StoreIC::GenerateMiss(MacroAssembler* masm) { |
| 889 | __ Push(StoreDescriptor::ReceiverRegister(), StoreDescriptor::NameRegister(), |
| 890 | StoreDescriptor::ValueRegister()); |
| 891 | |
| 892 | // Perform tail call to the entry. |
| 893 | ExternalReference ref = |
| 894 | ExternalReference(IC_Utility(kStoreIC_Miss), masm->isolate()); |
| 895 | __ TailCallExternalReference(ref, 3, 1); |
| 896 | } |
| 897 | |
| 898 | |
| 899 | void StoreIC::GenerateNormal(MacroAssembler* masm) { |
| 900 | Label miss; |
| 901 | Register receiver = StoreDescriptor::ReceiverRegister(); |
| 902 | Register name = StoreDescriptor::NameRegister(); |
| 903 | Register value = StoreDescriptor::ValueRegister(); |
| 904 | Register dictionary = r3; |
| 905 | DCHECK(receiver.is(r1)); |
| 906 | DCHECK(name.is(r2)); |
| 907 | DCHECK(value.is(r0)); |
| 908 | |
| 909 | __ ldr(dictionary, FieldMemOperand(receiver, JSObject::kPropertiesOffset)); |
| 910 | |
| 911 | GenerateDictionaryStore(masm, &miss, dictionary, name, value, r4, r5); |
| 912 | Counters* counters = masm->isolate()->counters(); |
| 913 | __ IncrementCounter(counters->store_normal_hit(), 1, r4, r5); |
| 914 | __ Ret(); |
| 915 | |
| 916 | __ bind(&miss); |
| 917 | __ IncrementCounter(counters->store_normal_miss(), 1, r4, r5); |
| 918 | GenerateMiss(masm); |
| 919 | } |
| 920 | |
| 921 | |
| 922 | #undef __ |
| 923 | |
| 924 | |
| 925 | Condition CompareIC::ComputeCondition(Token::Value op) { |
| 926 | switch (op) { |
| 927 | case Token::EQ_STRICT: |
| 928 | case Token::EQ: |
| 929 | return eq; |
| 930 | case Token::LT: |
| 931 | return lt; |
| 932 | case Token::GT: |
| 933 | return gt; |
| 934 | case Token::LTE: |
| 935 | return le; |
| 936 | case Token::GTE: |
| 937 | return ge; |
| 938 | default: |
| 939 | UNREACHABLE(); |
| 940 | return kNoCondition; |
| 941 | } |
| 942 | } |
| 943 | |
| 944 | |
| 945 | bool CompareIC::HasInlinedSmiCode(Address address) { |
| 946 | // The address of the instruction following the call. |
| 947 | Address cmp_instruction_address = |
| 948 | Assembler::return_address_from_call_start(address); |
| 949 | |
| 950 | // If the instruction following the call is not a cmp rx, #yyy, nothing |
| 951 | // was inlined. |
| 952 | Instr instr = Assembler::instr_at(cmp_instruction_address); |
| 953 | return Assembler::IsCmpImmediate(instr); |
| 954 | } |
| 955 | |
| 956 | |
| 957 | void PatchInlinedSmiCode(Address address, InlinedSmiCheck check) { |
| 958 | Address cmp_instruction_address = |
| 959 | Assembler::return_address_from_call_start(address); |
| 960 | |
| 961 | // If the instruction following the call is not a cmp rx, #yyy, nothing |
| 962 | // was inlined. |
| 963 | Instr instr = Assembler::instr_at(cmp_instruction_address); |
| 964 | if (!Assembler::IsCmpImmediate(instr)) { |
| 965 | return; |
| 966 | } |
| 967 | |
| 968 | // The delta to the start of the map check instruction and the |
| 969 | // condition code uses at the patched jump. |
| 970 | int delta = Assembler::GetCmpImmediateRawImmediate(instr); |
| 971 | delta += Assembler::GetCmpImmediateRegister(instr).code() * kOff12Mask; |
| 972 | // If the delta is 0 the instruction is cmp r0, #0 which also signals that |
| 973 | // nothing was inlined. |
| 974 | if (delta == 0) { |
| 975 | return; |
| 976 | } |
| 977 | |
| 978 | if (FLAG_trace_ic) { |
| 979 | PrintF("[ patching ic at %p, cmp=%p, delta=%d\n", address, |
| 980 | cmp_instruction_address, delta); |
| 981 | } |
| 982 | |
| 983 | Address patch_address = |
| 984 | cmp_instruction_address - delta * Instruction::kInstrSize; |
| 985 | Instr instr_at_patch = Assembler::instr_at(patch_address); |
| 986 | Instr branch_instr = |
| 987 | Assembler::instr_at(patch_address + Instruction::kInstrSize); |
| 988 | // This is patching a conditional "jump if not smi/jump if smi" site. |
| 989 | // Enabling by changing from |
| 990 | // cmp rx, rx |
| 991 | // b eq/ne, <target> |
| 992 | // to |
| 993 | // tst rx, #kSmiTagMask |
| 994 | // b ne/eq, <target> |
| 995 | // and vice-versa to be disabled again. |
| 996 | CodePatcher patcher(patch_address, 2); |
| 997 | Register reg = Assembler::GetRn(instr_at_patch); |
| 998 | if (check == ENABLE_INLINED_SMI_CHECK) { |
| 999 | DCHECK(Assembler::IsCmpRegister(instr_at_patch)); |
| 1000 | DCHECK_EQ(Assembler::GetRn(instr_at_patch).code(), |
| 1001 | Assembler::GetRm(instr_at_patch).code()); |
| 1002 | patcher.masm()->tst(reg, Operand(kSmiTagMask)); |
| 1003 | } else { |
| 1004 | DCHECK(check == DISABLE_INLINED_SMI_CHECK); |
| 1005 | DCHECK(Assembler::IsTstImmediate(instr_at_patch)); |
| 1006 | patcher.masm()->cmp(reg, reg); |
| 1007 | } |
| 1008 | DCHECK(Assembler::IsBranch(branch_instr)); |
| 1009 | if (Assembler::GetCondition(branch_instr) == eq) { |
| 1010 | patcher.EmitCondition(ne); |
| 1011 | } else { |
| 1012 | DCHECK(Assembler::GetCondition(branch_instr) == ne); |
| 1013 | patcher.EmitCondition(eq); |
| 1014 | } |
| 1015 | } |
| 1016 | } |
| 1017 | } // namespace v8::internal |
| 1018 | |
| 1019 | #endif // V8_TARGET_ARCH_ARM |