| // Copyright 2012 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #if V8_TARGET_ARCH_ARM |
| |
| #include "src/codegen.h" |
| #include "src/ic/ic.h" |
| #include "src/ic/ic-compiler.h" |
| #include "src/ic/stub-cache.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| |
| // ---------------------------------------------------------------------------- |
| // Static IC stub generators. |
| // |
| |
| #define __ ACCESS_MASM(masm) |
| |
| |
| static void GenerateGlobalInstanceTypeCheck(MacroAssembler* masm, Register type, |
| Label* global_object) { |
| // Register usage: |
| // type: holds the receiver instance type on entry. |
| __ cmp(type, Operand(JS_GLOBAL_OBJECT_TYPE)); |
| __ b(eq, global_object); |
| __ cmp(type, Operand(JS_GLOBAL_PROXY_TYPE)); |
| __ b(eq, global_object); |
| } |
| |
| |
| // Helper function used from LoadIC GenerateNormal. |
| // |
| // elements: Property dictionary. It is not clobbered if a jump to the miss |
| // label is done. |
| // name: Property name. It is not clobbered if a jump to the miss label is |
| // done |
| // result: Register for the result. It is only updated if a jump to the miss |
| // label is not done. Can be the same as elements or name clobbering |
| // one of these in the case of not jumping to the miss label. |
| // The two scratch registers need to be different from elements, name and |
| // result. |
| // The generated code assumes that the receiver has slow properties, |
| // is not a global object and does not have interceptors. |
| static void GenerateDictionaryLoad(MacroAssembler* masm, Label* miss, |
| Register elements, Register name, |
| Register result, Register scratch1, |
| Register scratch2) { |
| // Main use of the scratch registers. |
| // scratch1: Used as temporary and to hold the capacity of the property |
| // dictionary. |
| // scratch2: Used as temporary. |
| Label done; |
| |
| // Probe the dictionary. |
| NameDictionaryLookupStub::GeneratePositiveLookup(masm, miss, &done, elements, |
| name, scratch1, scratch2); |
| |
| // If probing finds an entry check that the value is a normal |
| // property. |
| __ bind(&done); // scratch2 == elements + 4 * index |
| const int kElementsStartOffset = |
| NameDictionary::kHeaderSize + |
| NameDictionary::kElementsStartIndex * kPointerSize; |
| const int kDetailsOffset = kElementsStartOffset + 2 * kPointerSize; |
| __ ldr(scratch1, FieldMemOperand(scratch2, kDetailsOffset)); |
| __ tst(scratch1, Operand(PropertyDetails::TypeField::kMask << kSmiTagSize)); |
| __ b(ne, miss); |
| |
| // Get the value at the masked, scaled index and return. |
| __ ldr(result, |
| FieldMemOperand(scratch2, kElementsStartOffset + 1 * kPointerSize)); |
| } |
| |
| |
| // Helper function used from StoreIC::GenerateNormal. |
| // |
| // elements: Property dictionary. It is not clobbered if a jump to the miss |
| // label is done. |
| // name: Property name. It is not clobbered if a jump to the miss label is |
| // done |
| // value: The value to store. |
| // The two scratch registers need to be different from elements, name and |
| // result. |
| // The generated code assumes that the receiver has slow properties, |
| // is not a global object and does not have interceptors. |
| static void GenerateDictionaryStore(MacroAssembler* masm, Label* miss, |
| Register elements, Register name, |
| Register value, Register scratch1, |
| Register scratch2) { |
| // Main use of the scratch registers. |
| // scratch1: Used as temporary and to hold the capacity of the property |
| // dictionary. |
| // scratch2: Used as temporary. |
| Label done; |
| |
| // Probe the dictionary. |
| NameDictionaryLookupStub::GeneratePositiveLookup(masm, miss, &done, elements, |
| name, scratch1, scratch2); |
| |
| // If probing finds an entry in the dictionary check that the value |
| // is a normal property that is not read only. |
| __ bind(&done); // scratch2 == elements + 4 * index |
| const int kElementsStartOffset = |
| NameDictionary::kHeaderSize + |
| NameDictionary::kElementsStartIndex * kPointerSize; |
| const int kDetailsOffset = kElementsStartOffset + 2 * kPointerSize; |
| const int kTypeAndReadOnlyMask = |
| (PropertyDetails::TypeField::kMask | |
| PropertyDetails::AttributesField::encode(READ_ONLY)) |
| << kSmiTagSize; |
| __ ldr(scratch1, FieldMemOperand(scratch2, kDetailsOffset)); |
| __ tst(scratch1, Operand(kTypeAndReadOnlyMask)); |
| __ b(ne, miss); |
| |
| // Store the value at the masked, scaled index and return. |
| const int kValueOffset = kElementsStartOffset + kPointerSize; |
| __ add(scratch2, scratch2, Operand(kValueOffset - kHeapObjectTag)); |
| __ str(value, MemOperand(scratch2)); |
| |
| // Update the write barrier. Make sure not to clobber the value. |
| __ mov(scratch1, value); |
| __ RecordWrite(elements, scratch2, scratch1, kLRHasNotBeenSaved, |
| kDontSaveFPRegs); |
| } |
| |
| |
| // Checks the receiver for special cases (value type, slow case bits). |
| // Falls through for regular JS object. |
| static void GenerateKeyedLoadReceiverCheck(MacroAssembler* masm, |
| Register receiver, Register map, |
| Register scratch, |
| int interceptor_bit, Label* slow) { |
| // Check that the object isn't a smi. |
| __ JumpIfSmi(receiver, slow); |
| // Get the map of the receiver. |
| __ ldr(map, FieldMemOperand(receiver, HeapObject::kMapOffset)); |
| // Check bit field. |
| __ ldrb(scratch, FieldMemOperand(map, Map::kBitFieldOffset)); |
| __ tst(scratch, |
| Operand((1 << Map::kIsAccessCheckNeeded) | (1 << interceptor_bit))); |
| __ b(ne, slow); |
| // Check that the object is some kind of JS object EXCEPT JS Value type. |
| // In the case that the object is a value-wrapper object, |
| // we enter the runtime system to make sure that indexing into string |
| // objects work as intended. |
| DCHECK(JS_OBJECT_TYPE > JS_VALUE_TYPE); |
| __ ldrb(scratch, FieldMemOperand(map, Map::kInstanceTypeOffset)); |
| __ cmp(scratch, Operand(JS_OBJECT_TYPE)); |
| __ b(lt, slow); |
| } |
| |
| |
| // Loads an indexed element from a fast case array. |
| static void GenerateFastArrayLoad(MacroAssembler* masm, Register receiver, |
| Register key, Register elements, |
| Register scratch1, Register scratch2, |
| Register result, Label* slow) { |
| // Register use: |
| // |
| // receiver - holds the receiver on entry. |
| // Unchanged unless 'result' is the same register. |
| // |
| // key - holds the smi key on entry. |
| // Unchanged unless 'result' is the same register. |
| // |
| // result - holds the result on exit if the load succeeded. |
| // Allowed to be the the same as 'receiver' or 'key'. |
| // Unchanged on bailout so 'receiver' and 'key' can be safely |
| // used by further computation. |
| // |
| // Scratch registers: |
| // |
| // elements - holds the elements of the receiver and its prototypes. |
| // |
| // scratch1 - used to hold elements length, bit fields, base addresses. |
| // |
| // scratch2 - used to hold maps, prototypes, and the loaded value. |
| Label check_prototypes, check_next_prototype; |
| Label done, in_bounds, absent; |
| |
| __ ldr(elements, FieldMemOperand(receiver, JSObject::kElementsOffset)); |
| __ AssertFastElements(elements); |
| |
| // Check that the key (index) is within bounds. |
| __ ldr(scratch1, FieldMemOperand(elements, FixedArray::kLengthOffset)); |
| __ cmp(key, Operand(scratch1)); |
| __ b(lo, &in_bounds); |
| // Out-of-bounds. Check the prototype chain to see if we can just return |
| // 'undefined'. |
| __ cmp(key, Operand(0)); |
| __ b(lt, slow); // Negative keys can't take the fast OOB path. |
| __ bind(&check_prototypes); |
| __ ldr(scratch2, FieldMemOperand(receiver, HeapObject::kMapOffset)); |
| __ bind(&check_next_prototype); |
| __ ldr(scratch2, FieldMemOperand(scratch2, Map::kPrototypeOffset)); |
| // scratch2: current prototype |
| __ CompareRoot(scratch2, Heap::kNullValueRootIndex); |
| __ b(eq, &absent); |
| __ ldr(elements, FieldMemOperand(scratch2, JSObject::kElementsOffset)); |
| __ ldr(scratch2, FieldMemOperand(scratch2, HeapObject::kMapOffset)); |
| // elements: elements of current prototype |
| // scratch2: map of current prototype |
| __ CompareInstanceType(scratch2, scratch1, JS_OBJECT_TYPE); |
| __ b(lo, slow); |
| __ ldrb(scratch1, FieldMemOperand(scratch2, Map::kBitFieldOffset)); |
| __ tst(scratch1, Operand((1 << Map::kIsAccessCheckNeeded) | |
| (1 << Map::kHasIndexedInterceptor))); |
| __ b(ne, slow); |
| __ CompareRoot(elements, Heap::kEmptyFixedArrayRootIndex); |
| __ b(ne, slow); |
| __ jmp(&check_next_prototype); |
| |
| __ bind(&absent); |
| __ LoadRoot(result, Heap::kUndefinedValueRootIndex); |
| __ jmp(&done); |
| |
| __ bind(&in_bounds); |
| // Fast case: Do the load. |
| __ add(scratch1, elements, Operand(FixedArray::kHeaderSize - kHeapObjectTag)); |
| __ ldr(scratch2, MemOperand::PointerAddressFromSmiKey(scratch1, key)); |
| __ CompareRoot(scratch2, Heap::kTheHoleValueRootIndex); |
| // In case the loaded value is the_hole we have to check the prototype chain. |
| __ b(eq, &check_prototypes); |
| __ mov(result, scratch2); |
| __ bind(&done); |
| } |
| |
| |
| // Checks whether a key is an array index string or a unique name. |
| // Falls through if a key is a unique name. |
| static void GenerateKeyNameCheck(MacroAssembler* masm, Register key, |
| Register map, Register hash, |
| Label* index_string, Label* not_unique) { |
| // The key is not a smi. |
| Label unique; |
| // Is it a name? |
| __ CompareObjectType(key, map, hash, LAST_UNIQUE_NAME_TYPE); |
| __ b(hi, not_unique); |
| STATIC_ASSERT(LAST_UNIQUE_NAME_TYPE == FIRST_NONSTRING_TYPE); |
| __ b(eq, &unique); |
| |
| // Is the string an array index, with cached numeric value? |
| __ ldr(hash, FieldMemOperand(key, Name::kHashFieldOffset)); |
| __ tst(hash, Operand(Name::kContainsCachedArrayIndexMask)); |
| __ b(eq, index_string); |
| |
| // Is the string internalized? We know it's a string, so a single |
| // bit test is enough. |
| // map: key map |
| __ ldrb(hash, FieldMemOperand(map, Map::kInstanceTypeOffset)); |
| STATIC_ASSERT(kInternalizedTag == 0); |
| __ tst(hash, Operand(kIsNotInternalizedMask)); |
| __ b(ne, not_unique); |
| |
| __ bind(&unique); |
| } |
| |
| void LoadIC::GenerateNormal(MacroAssembler* masm) { |
| Register dictionary = r0; |
| DCHECK(!dictionary.is(LoadDescriptor::ReceiverRegister())); |
| DCHECK(!dictionary.is(LoadDescriptor::NameRegister())); |
| |
| Label slow; |
| |
| __ ldr(dictionary, FieldMemOperand(LoadDescriptor::ReceiverRegister(), |
| JSObject::kPropertiesOffset)); |
| GenerateDictionaryLoad(masm, &slow, dictionary, |
| LoadDescriptor::NameRegister(), r0, r3, r4); |
| __ Ret(); |
| |
| // Dictionary load failed, go slow (but don't miss). |
| __ bind(&slow); |
| GenerateRuntimeGetProperty(masm); |
| } |
| |
| |
| // A register that isn't one of the parameters to the load ic. |
| static const Register LoadIC_TempRegister() { return r3; } |
| |
| |
| static void LoadIC_PushArgs(MacroAssembler* masm) { |
| Register receiver = LoadDescriptor::ReceiverRegister(); |
| Register name = LoadDescriptor::NameRegister(); |
| Register slot = LoadDescriptor::SlotRegister(); |
| Register vector = LoadWithVectorDescriptor::VectorRegister(); |
| |
| __ Push(receiver, name, slot, vector); |
| } |
| |
| |
| void LoadIC::GenerateMiss(MacroAssembler* masm) { |
| // The return address is in lr. |
| Isolate* isolate = masm->isolate(); |
| |
| DCHECK(!AreAliased(r4, r5, LoadWithVectorDescriptor::SlotRegister(), |
| LoadWithVectorDescriptor::VectorRegister())); |
| __ IncrementCounter(isolate->counters()->ic_load_miss(), 1, r4, r5); |
| |
| LoadIC_PushArgs(masm); |
| |
| // Perform tail call to the entry. |
| __ TailCallRuntime(Runtime::kLoadIC_Miss); |
| } |
| |
| void LoadIC::GenerateRuntimeGetProperty(MacroAssembler* masm) { |
| // The return address is in lr. |
| |
| __ mov(LoadIC_TempRegister(), LoadDescriptor::ReceiverRegister()); |
| __ Push(LoadIC_TempRegister(), LoadDescriptor::NameRegister()); |
| |
| // Do tail-call to runtime routine. |
| __ TailCallRuntime(Runtime::kGetProperty); |
| } |
| |
| |
| void KeyedLoadIC::GenerateMiss(MacroAssembler* masm) { |
| // The return address is in lr. |
| Isolate* isolate = masm->isolate(); |
| |
| DCHECK(!AreAliased(r4, r5, LoadWithVectorDescriptor::SlotRegister(), |
| LoadWithVectorDescriptor::VectorRegister())); |
| __ IncrementCounter(isolate->counters()->ic_keyed_load_miss(), 1, r4, r5); |
| |
| LoadIC_PushArgs(masm); |
| |
| // Perform tail call to the entry. |
| __ TailCallRuntime(Runtime::kKeyedLoadIC_Miss); |
| } |
| |
| void KeyedLoadIC::GenerateRuntimeGetProperty(MacroAssembler* masm) { |
| // The return address is in lr. |
| |
| __ Push(LoadDescriptor::ReceiverRegister(), LoadDescriptor::NameRegister()); |
| |
| // Perform tail call to the entry. |
| // Do tail-call to runtime routine. |
| __ TailCallRuntime(Runtime::kKeyedGetProperty); |
| } |
| |
| void KeyedLoadIC::GenerateMegamorphic(MacroAssembler* masm) { |
| // The return address is in lr. |
| Label slow, check_name, index_smi, index_name, property_array_property; |
| Label probe_dictionary, check_number_dictionary; |
| |
| Register key = LoadDescriptor::NameRegister(); |
| Register receiver = LoadDescriptor::ReceiverRegister(); |
| DCHECK(key.is(r2)); |
| DCHECK(receiver.is(r1)); |
| |
| Isolate* isolate = masm->isolate(); |
| |
| // Check that the key is a smi. |
| __ JumpIfNotSmi(key, &check_name); |
| __ bind(&index_smi); |
| // Now the key is known to be a smi. This place is also jumped to from below |
| // where a numeric string is converted to a smi. |
| |
| GenerateKeyedLoadReceiverCheck(masm, receiver, r0, r3, |
| Map::kHasIndexedInterceptor, &slow); |
| |
| // Check the receiver's map to see if it has fast elements. |
| __ CheckFastElements(r0, r3, &check_number_dictionary); |
| |
| GenerateFastArrayLoad(masm, receiver, key, r0, r3, r4, r0, &slow); |
| __ IncrementCounter(isolate->counters()->ic_keyed_load_generic_smi(), 1, r4, |
| r3); |
| __ Ret(); |
| |
| __ bind(&check_number_dictionary); |
| __ ldr(r4, FieldMemOperand(receiver, JSObject::kElementsOffset)); |
| __ ldr(r3, FieldMemOperand(r4, JSObject::kMapOffset)); |
| |
| // Check whether the elements is a number dictionary. |
| // r3: elements map |
| // r4: elements |
| __ LoadRoot(ip, Heap::kHashTableMapRootIndex); |
| __ cmp(r3, ip); |
| __ b(ne, &slow); |
| __ SmiUntag(r0, key); |
| __ LoadFromNumberDictionary(&slow, r4, key, r0, r0, r3, r5); |
| __ Ret(); |
| |
| // Slow case, key and receiver still in r2 and r1. |
| __ bind(&slow); |
| __ IncrementCounter(isolate->counters()->ic_keyed_load_generic_slow(), 1, r4, |
| r3); |
| GenerateRuntimeGetProperty(masm); |
| |
| __ bind(&check_name); |
| GenerateKeyNameCheck(masm, key, r0, r3, &index_name, &slow); |
| |
| GenerateKeyedLoadReceiverCheck(masm, receiver, r0, r3, |
| Map::kHasNamedInterceptor, &slow); |
| |
| // If the receiver is a fast-case object, check the stub cache. Otherwise |
| // probe the dictionary. |
| __ ldr(r3, FieldMemOperand(receiver, JSObject::kPropertiesOffset)); |
| __ ldr(r4, FieldMemOperand(r3, HeapObject::kMapOffset)); |
| __ LoadRoot(ip, Heap::kHashTableMapRootIndex); |
| __ cmp(r4, ip); |
| __ b(eq, &probe_dictionary); |
| |
| // The handlers in the stub cache expect a vector and slot. Since we won't |
| // change the IC from any downstream misses, a dummy vector can be used. |
| Register vector = LoadWithVectorDescriptor::VectorRegister(); |
| Register slot = LoadWithVectorDescriptor::SlotRegister(); |
| DCHECK(!AreAliased(vector, slot, r4, r5, r6, r9)); |
| Handle<TypeFeedbackVector> dummy_vector = |
| TypeFeedbackVector::DummyVector(masm->isolate()); |
| int slot_index = dummy_vector->GetIndex( |
| FeedbackVectorSlot(TypeFeedbackVector::kDummyKeyedLoadICSlot)); |
| __ LoadRoot(vector, Heap::kDummyVectorRootIndex); |
| __ mov(slot, Operand(Smi::FromInt(slot_index))); |
| |
| Code::Flags flags = |
| Code::RemoveHolderFromFlags(Code::ComputeHandlerFlags(Code::LOAD_IC)); |
| masm->isolate()->stub_cache()->GenerateProbe(masm, Code::KEYED_LOAD_IC, flags, |
| receiver, key, r4, r5, r6, r9); |
| // Cache miss. |
| GenerateMiss(masm); |
| |
| // Do a quick inline probe of the receiver's dictionary, if it |
| // exists. |
| __ bind(&probe_dictionary); |
| // r3: elements |
| __ ldr(r0, FieldMemOperand(receiver, HeapObject::kMapOffset)); |
| __ ldrb(r0, FieldMemOperand(r0, Map::kInstanceTypeOffset)); |
| GenerateGlobalInstanceTypeCheck(masm, r0, &slow); |
| // Load the property to r0. |
| GenerateDictionaryLoad(masm, &slow, r3, key, r0, r5, r4); |
| __ IncrementCounter(isolate->counters()->ic_keyed_load_generic_symbol(), 1, |
| r4, r3); |
| __ Ret(); |
| |
| __ bind(&index_name); |
| __ IndexFromHash(r3, key); |
| // Now jump to the place where smi keys are handled. |
| __ jmp(&index_smi); |
| } |
| |
| |
| static void StoreIC_PushArgs(MacroAssembler* masm) { |
| __ Push(StoreDescriptor::ReceiverRegister(), StoreDescriptor::NameRegister(), |
| StoreDescriptor::ValueRegister(), |
| VectorStoreICDescriptor::SlotRegister(), |
| VectorStoreICDescriptor::VectorRegister()); |
| } |
| |
| |
| void KeyedStoreIC::GenerateMiss(MacroAssembler* masm) { |
| StoreIC_PushArgs(masm); |
| |
| __ TailCallRuntime(Runtime::kKeyedStoreIC_Miss); |
| } |
| |
| |
| static void KeyedStoreGenerateMegamorphicHelper( |
| MacroAssembler* masm, Label* fast_object, Label* fast_double, Label* slow, |
| KeyedStoreCheckMap check_map, KeyedStoreIncrementLength increment_length, |
| Register value, Register key, Register receiver, Register receiver_map, |
| Register elements_map, Register elements) { |
| Label transition_smi_elements; |
| Label finish_object_store, non_double_value, transition_double_elements; |
| Label fast_double_without_map_check; |
| |
| // Fast case: Do the store, could be either Object or double. |
| __ bind(fast_object); |
| Register scratch = r4; |
| Register address = r5; |
| DCHECK(!AreAliased(value, key, receiver, receiver_map, elements_map, elements, |
| scratch, address)); |
| |
| if (check_map == kCheckMap) { |
| __ ldr(elements_map, FieldMemOperand(elements, HeapObject::kMapOffset)); |
| __ cmp(elements_map, |
| Operand(masm->isolate()->factory()->fixed_array_map())); |
| __ b(ne, fast_double); |
| } |
| |
| // HOLECHECK: guards "A[i] = V" |
| // We have to go to the runtime if the current value is the hole because |
| // there may be a callback on the element |
| Label holecheck_passed1; |
| __ add(address, elements, Operand(FixedArray::kHeaderSize - kHeapObjectTag)); |
| __ ldr(scratch, MemOperand::PointerAddressFromSmiKey(address, key, PreIndex)); |
| __ cmp(scratch, Operand(masm->isolate()->factory()->the_hole_value())); |
| __ b(ne, &holecheck_passed1); |
| __ JumpIfDictionaryInPrototypeChain(receiver, elements_map, scratch, slow); |
| |
| __ bind(&holecheck_passed1); |
| |
| // Smi stores don't require further checks. |
| Label non_smi_value; |
| __ JumpIfNotSmi(value, &non_smi_value); |
| |
| if (increment_length == kIncrementLength) { |
| // Add 1 to receiver->length. |
| __ add(scratch, key, Operand(Smi::FromInt(1))); |
| __ str(scratch, FieldMemOperand(receiver, JSArray::kLengthOffset)); |
| } |
| // It's irrelevant whether array is smi-only or not when writing a smi. |
| __ add(address, elements, Operand(FixedArray::kHeaderSize - kHeapObjectTag)); |
| __ str(value, MemOperand::PointerAddressFromSmiKey(address, key)); |
| __ Ret(); |
| |
| __ bind(&non_smi_value); |
| // Escape to elements kind transition case. |
| __ CheckFastObjectElements(receiver_map, scratch, &transition_smi_elements); |
| |
| // Fast elements array, store the value to the elements backing store. |
| __ bind(&finish_object_store); |
| if (increment_length == kIncrementLength) { |
| // Add 1 to receiver->length. |
| __ add(scratch, key, Operand(Smi::FromInt(1))); |
| __ str(scratch, FieldMemOperand(receiver, JSArray::kLengthOffset)); |
| } |
| __ add(address, elements, Operand(FixedArray::kHeaderSize - kHeapObjectTag)); |
| __ add(address, address, Operand::PointerOffsetFromSmiKey(key)); |
| __ str(value, MemOperand(address)); |
| // Update write barrier for the elements array address. |
| __ mov(scratch, value); // Preserve the value which is returned. |
| __ RecordWrite(elements, address, scratch, kLRHasNotBeenSaved, |
| kDontSaveFPRegs, EMIT_REMEMBERED_SET, OMIT_SMI_CHECK); |
| __ Ret(); |
| |
| __ bind(fast_double); |
| if (check_map == kCheckMap) { |
| // Check for fast double array case. If this fails, call through to the |
| // runtime. |
| __ CompareRoot(elements_map, Heap::kFixedDoubleArrayMapRootIndex); |
| __ b(ne, slow); |
| } |
| |
| // HOLECHECK: guards "A[i] double hole?" |
| // We have to see if the double version of the hole is present. If so |
| // go to the runtime. |
| __ add(address, elements, |
| Operand((FixedDoubleArray::kHeaderSize + sizeof(kHoleNanLower32)) - |
| kHeapObjectTag)); |
| __ ldr(scratch, MemOperand(address, key, LSL, kPointerSizeLog2, PreIndex)); |
| __ cmp(scratch, Operand(kHoleNanUpper32)); |
| __ b(ne, &fast_double_without_map_check); |
| __ JumpIfDictionaryInPrototypeChain(receiver, elements_map, scratch, slow); |
| |
| __ bind(&fast_double_without_map_check); |
| __ StoreNumberToDoubleElements(value, key, elements, scratch, d0, |
| &transition_double_elements); |
| if (increment_length == kIncrementLength) { |
| // Add 1 to receiver->length. |
| __ add(scratch, key, Operand(Smi::FromInt(1))); |
| __ str(scratch, FieldMemOperand(receiver, JSArray::kLengthOffset)); |
| } |
| __ Ret(); |
| |
| __ bind(&transition_smi_elements); |
| // Transition the array appropriately depending on the value type. |
| __ ldr(scratch, FieldMemOperand(value, HeapObject::kMapOffset)); |
| __ CompareRoot(scratch, Heap::kHeapNumberMapRootIndex); |
| __ b(ne, &non_double_value); |
| |
| // Value is a double. Transition FAST_SMI_ELEMENTS -> |
| // FAST_DOUBLE_ELEMENTS and complete the store. |
| __ LoadTransitionedArrayMapConditional( |
| FAST_SMI_ELEMENTS, FAST_DOUBLE_ELEMENTS, receiver_map, scratch, slow); |
| AllocationSiteMode mode = |
| AllocationSite::GetMode(FAST_SMI_ELEMENTS, FAST_DOUBLE_ELEMENTS); |
| ElementsTransitionGenerator::GenerateSmiToDouble(masm, receiver, key, value, |
| receiver_map, mode, slow); |
| __ ldr(elements, FieldMemOperand(receiver, JSObject::kElementsOffset)); |
| __ jmp(&fast_double_without_map_check); |
| |
| __ bind(&non_double_value); |
| // Value is not a double, FAST_SMI_ELEMENTS -> FAST_ELEMENTS |
| __ LoadTransitionedArrayMapConditional(FAST_SMI_ELEMENTS, FAST_ELEMENTS, |
| receiver_map, scratch, slow); |
| mode = AllocationSite::GetMode(FAST_SMI_ELEMENTS, FAST_ELEMENTS); |
| ElementsTransitionGenerator::GenerateMapChangeElementsTransition( |
| masm, receiver, key, value, receiver_map, mode, slow); |
| __ ldr(elements, FieldMemOperand(receiver, JSObject::kElementsOffset)); |
| __ jmp(&finish_object_store); |
| |
| __ bind(&transition_double_elements); |
| // Elements are FAST_DOUBLE_ELEMENTS, but value is an Object that's not a |
| // HeapNumber. Make sure that the receiver is a Array with FAST_ELEMENTS and |
| // transition array from FAST_DOUBLE_ELEMENTS to FAST_ELEMENTS |
| __ LoadTransitionedArrayMapConditional(FAST_DOUBLE_ELEMENTS, FAST_ELEMENTS, |
| receiver_map, scratch, slow); |
| mode = AllocationSite::GetMode(FAST_DOUBLE_ELEMENTS, FAST_ELEMENTS); |
| ElementsTransitionGenerator::GenerateDoubleToObject( |
| masm, receiver, key, value, receiver_map, mode, slow); |
| __ ldr(elements, FieldMemOperand(receiver, JSObject::kElementsOffset)); |
| __ jmp(&finish_object_store); |
| } |
| |
| |
| void KeyedStoreIC::GenerateMegamorphic(MacroAssembler* masm, |
| LanguageMode language_mode) { |
| // ---------- S t a t e -------------- |
| // -- r0 : value |
| // -- r1 : key |
| // -- r2 : receiver |
| // -- lr : return address |
| // ----------------------------------- |
| Label slow, fast_object, fast_object_grow; |
| Label fast_double, fast_double_grow; |
| Label array, extra, check_if_double_array, maybe_name_key, miss; |
| |
| // Register usage. |
| Register value = StoreDescriptor::ValueRegister(); |
| Register key = StoreDescriptor::NameRegister(); |
| Register receiver = StoreDescriptor::ReceiverRegister(); |
| DCHECK(receiver.is(r1)); |
| DCHECK(key.is(r2)); |
| DCHECK(value.is(r0)); |
| Register receiver_map = r3; |
| Register elements_map = r6; |
| Register elements = r9; // Elements array of the receiver. |
| // r4 and r5 are used as general scratch registers. |
| |
| // Check that the key is a smi. |
| __ JumpIfNotSmi(key, &maybe_name_key); |
| // Check that the object isn't a smi. |
| __ JumpIfSmi(receiver, &slow); |
| // Get the map of the object. |
| __ ldr(receiver_map, FieldMemOperand(receiver, HeapObject::kMapOffset)); |
| // Check that the receiver does not require access checks. |
| // The generic stub does not perform map checks. |
| __ ldrb(ip, FieldMemOperand(receiver_map, Map::kBitFieldOffset)); |
| __ tst(ip, Operand(1 << Map::kIsAccessCheckNeeded)); |
| __ b(ne, &slow); |
| // Check if the object is a JS array or not. |
| __ ldrb(r4, FieldMemOperand(receiver_map, Map::kInstanceTypeOffset)); |
| __ cmp(r4, Operand(JS_ARRAY_TYPE)); |
| __ b(eq, &array); |
| // Check that the object is some kind of JS object EXCEPT JS Value type. In |
| // the case that the object is a value-wrapper object, we enter the runtime |
| // system to make sure that indexing into string objects works as intended. |
| STATIC_ASSERT(JS_VALUE_TYPE < JS_OBJECT_TYPE); |
| __ cmp(r4, Operand(JS_OBJECT_TYPE)); |
| __ b(lo, &slow); |
| |
| // Object case: Check key against length in the elements array. |
| __ ldr(elements, FieldMemOperand(receiver, JSObject::kElementsOffset)); |
| // Check array bounds. Both the key and the length of FixedArray are smis. |
| __ ldr(ip, FieldMemOperand(elements, FixedArray::kLengthOffset)); |
| __ cmp(key, Operand(ip)); |
| __ b(lo, &fast_object); |
| |
| // Slow case, handle jump to runtime. |
| __ bind(&slow); |
| // Entry registers are intact. |
| // r0: value. |
| // r1: key. |
| // r2: receiver. |
| PropertyICCompiler::GenerateRuntimeSetProperty(masm, language_mode); |
| // Never returns to here. |
| |
| __ bind(&maybe_name_key); |
| __ ldr(r4, FieldMemOperand(key, HeapObject::kMapOffset)); |
| __ ldrb(r4, FieldMemOperand(r4, Map::kInstanceTypeOffset)); |
| __ JumpIfNotUniqueNameInstanceType(r4, &slow); |
| |
| // We use register r8, because otherwise probing the megamorphic stub cache |
| // would require pushing temporaries on the stack. |
| // TODO(mvstanton): quit using register r8 when |
| // FLAG_enable_embedded_constant_pool is turned on. |
| DCHECK(!FLAG_enable_embedded_constant_pool); |
| Register temporary2 = r8; |
| // The handlers in the stub cache expect a vector and slot. Since we won't |
| // change the IC from any downstream misses, a dummy vector can be used. |
| Register vector = VectorStoreICDescriptor::VectorRegister(); |
| Register slot = VectorStoreICDescriptor::SlotRegister(); |
| |
| DCHECK(!AreAliased(vector, slot, r5, temporary2, r6, r9)); |
| Handle<TypeFeedbackVector> dummy_vector = |
| TypeFeedbackVector::DummyVector(masm->isolate()); |
| int slot_index = dummy_vector->GetIndex( |
| FeedbackVectorSlot(TypeFeedbackVector::kDummyKeyedStoreICSlot)); |
| __ LoadRoot(vector, Heap::kDummyVectorRootIndex); |
| __ mov(slot, Operand(Smi::FromInt(slot_index))); |
| |
| Code::Flags flags = |
| Code::RemoveHolderFromFlags(Code::ComputeHandlerFlags(Code::STORE_IC)); |
| masm->isolate()->stub_cache()->GenerateProbe( |
| masm, Code::KEYED_STORE_IC, flags, receiver, key, r5, temporary2, r6, r9); |
| // Cache miss. |
| __ b(&miss); |
| |
| // Extra capacity case: Check if there is extra capacity to |
| // perform the store and update the length. Used for adding one |
| // element to the array by writing to array[array.length]. |
| __ bind(&extra); |
| // Condition code from comparing key and array length is still available. |
| __ b(ne, &slow); // Only support writing to writing to array[array.length]. |
| // Check for room in the elements backing store. |
| // Both the key and the length of FixedArray are smis. |
| __ ldr(ip, FieldMemOperand(elements, FixedArray::kLengthOffset)); |
| __ cmp(key, Operand(ip)); |
| __ b(hs, &slow); |
| __ ldr(elements_map, FieldMemOperand(elements, HeapObject::kMapOffset)); |
| __ cmp(elements_map, Operand(masm->isolate()->factory()->fixed_array_map())); |
| __ b(ne, &check_if_double_array); |
| __ jmp(&fast_object_grow); |
| |
| __ bind(&check_if_double_array); |
| __ cmp(elements_map, |
| Operand(masm->isolate()->factory()->fixed_double_array_map())); |
| __ b(ne, &slow); |
| __ jmp(&fast_double_grow); |
| |
| // Array case: Get the length and the elements array from the JS |
| // array. Check that the array is in fast mode (and writable); if it |
| // is the length is always a smi. |
| __ bind(&array); |
| __ ldr(elements, FieldMemOperand(receiver, JSObject::kElementsOffset)); |
| |
| // Check the key against the length in the array. |
| __ ldr(ip, FieldMemOperand(receiver, JSArray::kLengthOffset)); |
| __ cmp(key, Operand(ip)); |
| __ b(hs, &extra); |
| |
| KeyedStoreGenerateMegamorphicHelper( |
| masm, &fast_object, &fast_double, &slow, kCheckMap, kDontIncrementLength, |
| value, key, receiver, receiver_map, elements_map, elements); |
| KeyedStoreGenerateMegamorphicHelper(masm, &fast_object_grow, |
| &fast_double_grow, &slow, kDontCheckMap, |
| kIncrementLength, value, key, receiver, |
| receiver_map, elements_map, elements); |
| |
| __ bind(&miss); |
| GenerateMiss(masm); |
| } |
| |
| void StoreIC::GenerateMiss(MacroAssembler* masm) { |
| StoreIC_PushArgs(masm); |
| |
| // Perform tail call to the entry. |
| __ TailCallRuntime(Runtime::kStoreIC_Miss); |
| } |
| |
| |
| void StoreIC::GenerateNormal(MacroAssembler* masm) { |
| Label miss; |
| Register receiver = StoreDescriptor::ReceiverRegister(); |
| Register name = StoreDescriptor::NameRegister(); |
| Register value = StoreDescriptor::ValueRegister(); |
| Register dictionary = r5; |
| DCHECK(receiver.is(r1)); |
| DCHECK(name.is(r2)); |
| DCHECK(value.is(r0)); |
| DCHECK(VectorStoreICDescriptor::VectorRegister().is(r3)); |
| DCHECK(VectorStoreICDescriptor::SlotRegister().is(r4)); |
| |
| __ ldr(dictionary, FieldMemOperand(receiver, JSObject::kPropertiesOffset)); |
| |
| GenerateDictionaryStore(masm, &miss, dictionary, name, value, r6, r9); |
| Counters* counters = masm->isolate()->counters(); |
| __ IncrementCounter(counters->ic_store_normal_hit(), 1, r6, r9); |
| __ Ret(); |
| |
| __ bind(&miss); |
| __ IncrementCounter(counters->ic_store_normal_miss(), 1, r6, r9); |
| GenerateMiss(masm); |
| } |
| |
| |
| #undef __ |
| |
| |
| Condition CompareIC::ComputeCondition(Token::Value op) { |
| switch (op) { |
| case Token::EQ_STRICT: |
| case Token::EQ: |
| return eq; |
| case Token::LT: |
| return lt; |
| case Token::GT: |
| return gt; |
| case Token::LTE: |
| return le; |
| case Token::GTE: |
| return ge; |
| default: |
| UNREACHABLE(); |
| return kNoCondition; |
| } |
| } |
| |
| |
| bool CompareIC::HasInlinedSmiCode(Address address) { |
| // The address of the instruction following the call. |
| Address cmp_instruction_address = |
| Assembler::return_address_from_call_start(address); |
| |
| // If the instruction following the call is not a cmp rx, #yyy, nothing |
| // was inlined. |
| Instr instr = Assembler::instr_at(cmp_instruction_address); |
| return Assembler::IsCmpImmediate(instr); |
| } |
| |
| |
| void PatchInlinedSmiCode(Isolate* isolate, Address address, |
| InlinedSmiCheck check) { |
| Address cmp_instruction_address = |
| Assembler::return_address_from_call_start(address); |
| |
| // If the instruction following the call is not a cmp rx, #yyy, nothing |
| // was inlined. |
| Instr instr = Assembler::instr_at(cmp_instruction_address); |
| if (!Assembler::IsCmpImmediate(instr)) { |
| return; |
| } |
| |
| // The delta to the start of the map check instruction and the |
| // condition code uses at the patched jump. |
| int delta = Assembler::GetCmpImmediateRawImmediate(instr); |
| delta += Assembler::GetCmpImmediateRegister(instr).code() * kOff12Mask; |
| // If the delta is 0 the instruction is cmp r0, #0 which also signals that |
| // nothing was inlined. |
| if (delta == 0) { |
| return; |
| } |
| |
| if (FLAG_trace_ic) { |
| PrintF("[ patching ic at %p, cmp=%p, delta=%d\n", |
| static_cast<void*>(address), |
| static_cast<void*>(cmp_instruction_address), delta); |
| } |
| |
| Address patch_address = |
| cmp_instruction_address - delta * Instruction::kInstrSize; |
| Instr instr_at_patch = Assembler::instr_at(patch_address); |
| Instr branch_instr = |
| Assembler::instr_at(patch_address + Instruction::kInstrSize); |
| // This is patching a conditional "jump if not smi/jump if smi" site. |
| // Enabling by changing from |
| // cmp rx, rx |
| // b eq/ne, <target> |
| // to |
| // tst rx, #kSmiTagMask |
| // b ne/eq, <target> |
| // and vice-versa to be disabled again. |
| CodePatcher patcher(isolate, patch_address, 2); |
| Register reg = Assembler::GetRn(instr_at_patch); |
| if (check == ENABLE_INLINED_SMI_CHECK) { |
| DCHECK(Assembler::IsCmpRegister(instr_at_patch)); |
| DCHECK_EQ(Assembler::GetRn(instr_at_patch).code(), |
| Assembler::GetRm(instr_at_patch).code()); |
| patcher.masm()->tst(reg, Operand(kSmiTagMask)); |
| } else { |
| DCHECK(check == DISABLE_INLINED_SMI_CHECK); |
| DCHECK(Assembler::IsTstImmediate(instr_at_patch)); |
| patcher.masm()->cmp(reg, reg); |
| } |
| DCHECK(Assembler::IsBranch(branch_instr)); |
| if (Assembler::GetCondition(branch_instr) == eq) { |
| patcher.EmitCondition(ne); |
| } else { |
| DCHECK(Assembler::GetCondition(branch_instr) == ne); |
| patcher.EmitCondition(eq); |
| } |
| } |
| } // namespace internal |
| } // namespace v8 |
| |
| #endif // V8_TARGET_ARCH_ARM |