text: // Copyright 2011 the V8 project authors. All rights reserved.
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  //     * Redistributions of source code must retain the above copyright
  //       notice, this list of conditions and the following disclaimer.
  //     * Redistributions in binary form must reproduce the above
  //       copyright notice, this list of conditions and the following
  //       disclaimer in the documentation and/or other materials provided
  //       with the distribution.
  //     * Neither the name of Google Inc. nor the names of its
  //       contributors may be used to endorse or promote products derived
  //       from this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  #include "v8.h"
  
  #if defined(V8_TARGET_ARCH_IA32)
  
  #include "codegen.h"
  #include "ic-inl.h"
  #include "runtime.h"
  #include "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, JS_GLOBAL_OBJECT_TYPE);
    __ j(equal, global_object);
    __ cmp(type, JS_BUILTINS_OBJECT_TYPE);
    __ j(equal, global_object);
    __ cmp(type, JS_GLOBAL_PROXY_TYPE);
    __ j(equal, global_object);
  }
  
  
  // Generated code falls through if the receiver is a regular non-global
  // JS object with slow properties and no interceptors.
  static void GenerateStringDictionaryReceiverCheck(MacroAssembler* masm,
                                                    Register receiver,
                                                    Register r0,
                                                    Register r1,
                                                    Label* miss) {
    // Register usage:
    //   receiver: holds the receiver on entry and is unchanged.
    //   r0: used to hold receiver instance type.
    //       Holds the property dictionary on fall through.
    //   r1: used to hold receivers map.
  
    // Check that the receiver isn't a smi.
    __ JumpIfSmi(receiver, miss);
  
    // Check that the receiver is a valid JS object.
    __ mov(r1, FieldOperand(receiver, HeapObject::kMapOffset));
    __ movzx_b(r0, FieldOperand(r1, Map::kInstanceTypeOffset));
    __ cmp(r0, FIRST_SPEC_OBJECT_TYPE);
    __ j(below, miss);
  
    // If this assert fails, we have to check upper bound too.
    STATIC_ASSERT(LAST_TYPE == LAST_SPEC_OBJECT_TYPE);
  
    GenerateGlobalInstanceTypeCheck(masm, r0, miss);
  
    // Check for non-global object that requires access check.
    __ test_b(FieldOperand(r1, Map::kBitFieldOffset),
              (1 << Map::kIsAccessCheckNeeded) |
              (1 << Map::kHasNamedInterceptor));
    __ j(not_zero, miss);
  
    __ mov(r0, FieldOperand(receiver, JSObject::kPropertiesOffset));
    __ CheckMap(r0, FACTORY->hash_table_map(), miss, DONT_DO_SMI_CHECK);
  }
  
  
  // Helper function used to load a property from a dictionary backing
  // storage. This function may fail to load a property even though it is
  // in the dictionary, so code at miss_label must always call a backup
  // property load that is complete. This function is safe to call if
  // name is not a symbol, and will jump to the miss_label in that
  // case. 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_label,
                                     Register elements,
                                     Register name,
                                     Register r0,
                                     Register r1,
                                     Register result) {
    // Register use:
    //
    // elements - holds the property dictionary on entry and is unchanged.
    //
    // name - holds the name of the property on entry and is unchanged.
    //
    // Scratch registers:
    //
    // r0   - used for the index into the property dictionary
    //
    // r1   - used to hold the capacity of the property dictionary.
    //
    // result - holds the result on exit.
  
    Label done;
  
    // Probe the dictionary.
    StringDictionaryLookupStub::GeneratePositiveLookup(masm,
                                                       miss_label,
                                                       &done,
                                                       elements,
                                                       name,
                                                       r0,
                                                       r1);
  
    // If probing finds an entry in the dictionary, r0 contains the
    // index into the dictionary. Check that the value is a normal
    // property.
    __ bind(&done);
    const int kElementsStartOffset =
        StringDictionary::kHeaderSize +
        StringDictionary::kElementsStartIndex * kPointerSize;
    const int kDetailsOffset = kElementsStartOffset + 2 * kPointerSize;
    __ test(Operand(elements, r0, times_4, kDetailsOffset - kHeapObjectTag),
            Immediate(PropertyDetails::TypeField::kMask << kSmiTagSize));
    __ j(not_zero, miss_label);
  
    // Get the value at the masked, scaled index.
    const int kValueOffset = kElementsStartOffset + kPointerSize;
    __ mov(result, Operand(elements, r0, times_4, kValueOffset - kHeapObjectTag));
  }
  
  
  // Helper function used to store a property to a dictionary backing
  // storage. This function may fail to store a property eventhough it
  // is in the dictionary, so code at miss_label must always call a
  // backup property store that is complete. This function is safe to
  // call if name is not a symbol, and will jump to the miss_label in
  // that case. 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_label,
                                      Register elements,
                                      Register name,
                                      Register value,
                                      Register r0,
                                      Register r1) {
    // Register use:
    //
    // elements - holds the property dictionary on entry and is clobbered.
    //
    // name - holds the name of the property on entry and is unchanged.
    //
    // value - holds the value to store and is unchanged.
    //
    // r0 - used for index into the property dictionary and is clobbered.
    //
    // r1 - used to hold the capacity of the property dictionary and is clobbered.
    Label done;
  
  
    // Probe the dictionary.
    StringDictionaryLookupStub::GeneratePositiveLookup(masm,
                                                       miss_label,
                                                       &done,
                                                       elements,
                                                       name,
                                                       r0,
                                                       r1);
  
    // If probing finds an entry in the dictionary, r0 contains the
    // index into the dictionary. Check that the value is a normal
    // property that is not read only.
    __ bind(&done);
    const int kElementsStartOffset =
        StringDictionary::kHeaderSize +
        StringDictionary::kElementsStartIndex * kPointerSize;
    const int kDetailsOffset = kElementsStartOffset + 2 * kPointerSize;
    const int kTypeAndReadOnlyMask =
        (PropertyDetails::TypeField::kMask |
         PropertyDetails::AttributesField::encode(READ_ONLY)) << kSmiTagSize;
    __ test(Operand(elements, r0, times_4, kDetailsOffset - kHeapObjectTag),
            Immediate(kTypeAndReadOnlyMask));
    __ j(not_zero, miss_label);
  
    // Store the value at the masked, scaled index.
    const int kValueOffset = kElementsStartOffset + kPointerSize;
    __ lea(r0, Operand(elements, r0, times_4, kValueOffset - kHeapObjectTag));
    __ mov(Operand(r0, 0), value);
  
    // Update write barrier. Make sure not to clobber the value.
    __ mov(r1, value);
    __ RecordWrite(elements, r0, r1, kDontSaveFPRegs);
  }
  
  
  void LoadIC::GenerateArrayLength(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- eax    : receiver
    //  -- ecx    : name
    //  -- esp[0] : return address
    // -----------------------------------
    Label miss;
  
    StubCompiler::GenerateLoadArrayLength(masm, eax, edx, &miss);
    __ bind(&miss);
    StubCompiler::GenerateLoadMiss(masm, Code::LOAD_IC);
  }
  
  
  void LoadIC::GenerateStringLength(MacroAssembler* masm,
                                    bool support_wrappers) {
    // ----------- S t a t e -------------
    //  -- eax    : receiver
    //  -- ecx    : name
    //  -- esp[0] : return address
    // -----------------------------------
    Label miss;
  
    StubCompiler::GenerateLoadStringLength(masm, eax, edx, ebx, &miss,
                                           support_wrappers);
    __ bind(&miss);
    StubCompiler::GenerateLoadMiss(masm, Code::LOAD_IC);
  }
  
  
  void LoadIC::GenerateFunctionPrototype(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- eax    : receiver
    //  -- ecx    : name
    //  -- esp[0] : return address
    // -----------------------------------
    Label miss;
  
    StubCompiler::GenerateLoadFunctionPrototype(masm, eax, edx, ebx, &miss);
    __ bind(&miss);
    StubCompiler::GenerateLoadMiss(masm, Code::LOAD_IC);
  }
  
  
  // 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,
                                             int interceptor_bit,
                                             Label* slow) {
    // Register use:
    //   receiver - holds the receiver and is unchanged.
    // Scratch registers:
    //   map - used to hold the map of the receiver.
  
    // Check that the object isn't a smi.
    __ JumpIfSmi(receiver, slow);
  
    // Get the map of the receiver.
    __ mov(map, FieldOperand(receiver, HeapObject::kMapOffset));
  
    // Check bit field.
    __ test_b(FieldOperand(map, Map::kBitFieldOffset),
              (1 << Map::kIsAccessCheckNeeded) | (1 << interceptor_bit));
    __ j(not_zero, 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 works as intended.
    ASSERT(JS_OBJECT_TYPE > JS_VALUE_TYPE);
  
    __ CmpInstanceType(map, JS_OBJECT_TYPE);
    __ j(below, slow);
  }
  
  
  // Loads an indexed element from a fast case array.
  // If not_fast_array is NULL, doesn't perform the elements map check.
  static void GenerateFastArrayLoad(MacroAssembler* masm,
                                    Register receiver,
                                    Register key,
                                    Register scratch,
                                    Register result,
                                    Label* not_fast_array,
                                    Label* out_of_range) {
    // Register use:
    //   receiver - holds the receiver and is unchanged.
    //   key - holds the key and is unchanged (must be a smi).
    // Scratch registers:
    //   scratch - used to hold elements of the receiver and the loaded value.
    //   result - holds the result on exit if the load succeeds and
    //            we fall through.
  
    __ mov(scratch, FieldOperand(receiver, JSObject::kElementsOffset));
    if (not_fast_array != NULL) {
      // Check that the object is in fast mode and writable.
      __ CheckMap(scratch,
                  FACTORY->fixed_array_map(),
                  not_fast_array,
                  DONT_DO_SMI_CHECK);
    } else {
      __ AssertFastElements(scratch);
    }
    // Check that the key (index) is within bounds.
    __ cmp(key, FieldOperand(scratch, FixedArray::kLengthOffset));
    __ j(above_equal, out_of_range);
    // Fast case: Do the load.
    STATIC_ASSERT((kPointerSize == 4) && (kSmiTagSize == 1) && (kSmiTag == 0));
    __ mov(scratch, FieldOperand(scratch, key, times_2, FixedArray::kHeaderSize));
    __ cmp(scratch, Immediate(FACTORY->the_hole_value()));
    // In case the loaded value is the_hole we have to consult GetProperty
    // to ensure the prototype chain is searched.
    __ j(equal, out_of_range);
    if (!result.is(scratch)) {
      __ mov(result, scratch);
    }
  }
  
  
  // Checks whether a key is an array index string or a symbol string.
  // Falls through if the key is a symbol.
  static void GenerateKeyStringCheck(MacroAssembler* masm,
                                     Register key,
                                     Register map,
                                     Register hash,
                                     Label* index_string,
                                     Label* not_symbol) {
    // Register use:
    //   key - holds the key and is unchanged. Assumed to be non-smi.
    // Scratch registers:
    //   map - used to hold the map of the key.
    //   hash - used to hold the hash of the key.
    __ CmpObjectType(key, FIRST_NONSTRING_TYPE, map);
    __ j(above_equal, not_symbol);
  
    // Is the string an array index, with cached numeric value?
    __ mov(hash, FieldOperand(key, String::kHashFieldOffset));
    __ test(hash, Immediate(String::kContainsCachedArrayIndexMask));
    __ j(zero, index_string);
  
    // Is the string a symbol?
    STATIC_ASSERT(kSymbolTag != 0);
    __ test_b(FieldOperand(map, Map::kInstanceTypeOffset), kIsSymbolMask);
    __ j(zero, not_symbol);
  }
  
  
  static Operand GenerateMappedArgumentsLookup(MacroAssembler* masm,
                                               Register object,
                                               Register key,
                                               Register scratch1,
                                               Register scratch2,
                                               Label* unmapped_case,
                                               Label* slow_case) {
    Heap* heap = masm->isolate()->heap();
    Factory* factory = masm->isolate()->factory();
  
    // Check that the receiver is a JSObject. Because of the elements
    // map check later, we do not need to check for interceptors or
    // whether it requires access checks.
    __ JumpIfSmi(object, slow_case);
    // Check that the object is some kind of JSObject.
    __ CmpObjectType(object, FIRST_JS_RECEIVER_TYPE, scratch1);
    __ j(below, slow_case);
  
    // Check that the key is a positive smi.
    __ test(key, Immediate(0x8000001));
    __ j(not_zero, slow_case);
  
    // Load the elements into scratch1 and check its map.
    Handle<Map> arguments_map(heap->non_strict_arguments_elements_map());
    __ mov(scratch1, FieldOperand(object, JSObject::kElementsOffset));
    __ CheckMap(scratch1, arguments_map, slow_case, DONT_DO_SMI_CHECK);
  
    // Check if element is in the range of mapped arguments. If not, jump
    // to the unmapped lookup with the parameter map in scratch1.
    __ mov(scratch2, FieldOperand(scratch1, FixedArray::kLengthOffset));
    __ sub(scratch2, Immediate(Smi::FromInt(2)));
    __ cmp(key, scratch2);
    __ j(greater_equal, unmapped_case);
  
    // Load element index and check whether it is the hole.
    const int kHeaderSize = FixedArray::kHeaderSize + 2 * kPointerSize;
    __ mov(scratch2, FieldOperand(scratch1,
                                  key,
                                  times_half_pointer_size,
                                  kHeaderSize));
    __ cmp(scratch2, factory->the_hole_value());
    __ j(equal, unmapped_case);
  
    // Load value from context and return it. We can reuse scratch1 because
    // we do not jump to the unmapped lookup (which requires the parameter
    // map in scratch1).
    const int kContextOffset = FixedArray::kHeaderSize;
    __ mov(scratch1, FieldOperand(scratch1, kContextOffset));
    return FieldOperand(scratch1,
                        scratch2,
                        times_half_pointer_size,
                        Context::kHeaderSize);
  }
  
  
  static Operand GenerateUnmappedArgumentsLookup(MacroAssembler* masm,
                                                 Register key,
                                                 Register parameter_map,
                                                 Register scratch,
                                                 Label* slow_case) {
    // Element is in arguments backing store, which is referenced by the
    // second element of the parameter_map.
    const int kBackingStoreOffset = FixedArray::kHeaderSize + kPointerSize;
    Register backing_store = parameter_map;
    __ mov(backing_store, FieldOperand(parameter_map, kBackingStoreOffset));
    Handle<Map> fixed_array_map(masm->isolate()->heap()->fixed_array_map());
    __ CheckMap(backing_store, fixed_array_map, slow_case, DONT_DO_SMI_CHECK);
    __ mov(scratch, FieldOperand(backing_store, FixedArray::kLengthOffset));
    __ cmp(key, scratch);
    __ j(greater_equal, slow_case);
    return FieldOperand(backing_store,
                        key,
                        times_half_pointer_size,
                        FixedArray::kHeaderSize);
  }
  
  
  void KeyedLoadIC::GenerateGeneric(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- eax    : key
    //  -- edx    : receiver
    //  -- esp[0] : return address
    // -----------------------------------
    Label slow, check_string, index_smi, index_string, property_array_property;
    Label probe_dictionary, check_number_dictionary;
  
    // Check that the key is a smi.
    __ JumpIfNotSmi(eax, &check_string);
    __ bind(&index_smi);
    // Now the key is known to be a smi. This place is also jumped to from
    // where a numeric string is converted to a smi.
  
    GenerateKeyedLoadReceiverCheck(
        masm, edx, ecx, Map::kHasIndexedInterceptor, &slow);
  
    // Check the receiver's map to see if it has fast elements.
    __ CheckFastElements(ecx, &check_number_dictionary);
  
    GenerateFastArrayLoad(masm,
                          edx,
                          eax,
                          ecx,
                          eax,
                          NULL,
                          &slow);
    Isolate* isolate = masm->isolate();
    Counters* counters = isolate->counters();
    __ IncrementCounter(counters->keyed_load_generic_smi(), 1);
    __ ret(0);
  
    __ bind(&check_number_dictionary);
    __ mov(ebx, eax);
    __ SmiUntag(ebx);
    __ mov(ecx, FieldOperand(edx, JSObject::kElementsOffset));
  
    // Check whether the elements is a number dictionary.
    // edx: receiver
    // ebx: untagged index
    // eax: key
    // ecx: elements
    __ CheckMap(ecx,
                isolate->factory()->hash_table_map(),
                &slow,
                DONT_DO_SMI_CHECK);
    Label slow_pop_receiver;
    // Push receiver on the stack to free up a register for the dictionary
    // probing.
    __ push(edx);
    __ LoadFromNumberDictionary(&slow_pop_receiver,
                                ecx,
                                eax,
                                ebx,
                                edx,
                                edi,
                                eax);
    // Pop receiver before returning.
    __ pop(edx);
    __ ret(0);
  
    __ bind(&slow_pop_receiver);
    // Pop the receiver from the stack and jump to runtime.
    __ pop(edx);
  
    __ bind(&slow);
    // Slow case: jump to runtime.
    // edx: receiver
    // eax: key
    __ IncrementCounter(counters->keyed_load_generic_slow(), 1);
    GenerateRuntimeGetProperty(masm);
  
    __ bind(&check_string);
    GenerateKeyStringCheck(masm, eax, ecx, ebx, &index_string, &slow);
  
    GenerateKeyedLoadReceiverCheck(
        masm, edx, ecx, Map::kHasNamedInterceptor, &slow);
  
    // If the receiver is a fast-case object, check the keyed lookup
    // cache. Otherwise probe the dictionary.
    __ mov(ebx, FieldOperand(edx, JSObject::kPropertiesOffset));
    __ cmp(FieldOperand(ebx, HeapObject::kMapOffset),
           Immediate(isolate->factory()->hash_table_map()));
    __ j(equal, &probe_dictionary);
  
    // Load the map of the receiver, compute the keyed lookup cache hash
    // based on 32 bits of the map pointer and the string hash.
    __ mov(ebx, FieldOperand(edx, HeapObject::kMapOffset));
    __ mov(ecx, ebx);
    __ shr(ecx, KeyedLookupCache::kMapHashShift);
    __ mov(edi, FieldOperand(eax, String::kHashFieldOffset));
    __ shr(edi, String::kHashShift);
    __ xor_(ecx, edi);
    __ and_(ecx, KeyedLookupCache::kCapacityMask);
  
    // Load the key (consisting of map and symbol) from the cache and
    // check for match.
    ExternalReference cache_keys =
        ExternalReference::keyed_lookup_cache_keys(masm->isolate());
    __ mov(edi, ecx);
    __ shl(edi, kPointerSizeLog2 + 1);
    __ cmp(ebx, Operand::StaticArray(edi, times_1, cache_keys));
    __ j(not_equal, &slow);
    __ add(edi, Immediate(kPointerSize));
    __ cmp(eax, Operand::StaticArray(edi, times_1, cache_keys));
    __ j(not_equal, &slow);
  
    // Get field offset.
    // edx     : receiver
    // ebx     : receiver's map
    // eax     : key
    // ecx     : lookup cache index
    ExternalReference cache_field_offsets =
        ExternalReference::keyed_lookup_cache_field_offsets(masm->isolate());
    __ mov(edi,
           Operand::StaticArray(ecx, times_pointer_size, cache_field_offsets));
    __ movzx_b(ecx, FieldOperand(ebx, Map::kInObjectPropertiesOffset));
    __ sub(edi, ecx);
    __ j(above_equal, &property_array_property);
  
    // Load in-object property.
    __ movzx_b(ecx, FieldOperand(ebx, Map::kInstanceSizeOffset));
    __ add(ecx, edi);
    __ mov(eax, FieldOperand(edx, ecx, times_pointer_size, 0));
    __ IncrementCounter(counters->keyed_load_generic_lookup_cache(), 1);
    __ ret(0);
  
    // Load property array property.
    __ bind(&property_array_property);
    __ mov(eax, FieldOperand(edx, JSObject::kPropertiesOffset));
    __ mov(eax, FieldOperand(eax, edi, times_pointer_size,
                             FixedArray::kHeaderSize));
    __ IncrementCounter(counters->keyed_load_generic_lookup_cache(), 1);
    __ ret(0);
  
    // Do a quick inline probe of the receiver's dictionary, if it
    // exists.
    __ bind(&probe_dictionary);
  
    __ mov(ecx, FieldOperand(edx, JSObject::kMapOffset));
    __ movzx_b(ecx, FieldOperand(ecx, Map::kInstanceTypeOffset));
    GenerateGlobalInstanceTypeCheck(masm, ecx, &slow);
  
    GenerateDictionaryLoad(masm, &slow, ebx, eax, ecx, edi, eax);
    __ IncrementCounter(counters->keyed_load_generic_symbol(), 1);
    __ ret(0);
  
    __ bind(&index_string);
    __ IndexFromHash(ebx, eax);
    // Now jump to the place where smi keys are handled.
    __ jmp(&index_smi);
  }
  
  
  void KeyedLoadIC::GenerateString(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- eax    : key (index)
    //  -- edx    : receiver
    //  -- esp[0] : return address
    // -----------------------------------
    Label miss;
  
    Register receiver = edx;
    Register index = eax;
    Register scratch = ecx;
    Register result = eax;
  
    StringCharAtGenerator char_at_generator(receiver,
                                            index,
                                            scratch,
                                            result,
                                            &miss,  // When not a string.
                                            &miss,  // When not a number.
                                            &miss,  // When index out of range.
                                            STRING_INDEX_IS_ARRAY_INDEX);
    char_at_generator.GenerateFast(masm);
    __ ret(0);
  
    StubRuntimeCallHelper call_helper;
    char_at_generator.GenerateSlow(masm, call_helper);
  
    __ bind(&miss);
    GenerateMiss(masm, false);
  }
  
  
  void KeyedLoadIC::GenerateIndexedInterceptor(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- eax    : key
    //  -- edx    : receiver
    //  -- esp[0] : return address
    // -----------------------------------
    Label slow;
  
    // Check that the receiver isn't a smi.
    __ JumpIfSmi(edx, &slow);
  
    // Check that the key is an array index, that is Uint32.
    __ test(eax, Immediate(kSmiTagMask | kSmiSignMask));
    __ j(not_zero, &slow);
  
    // Get the map of the receiver.
    __ mov(ecx, FieldOperand(edx, HeapObject::kMapOffset));
  
    // Check that it has indexed interceptor and access checks
    // are not enabled for this object.
    __ movzx_b(ecx, FieldOperand(ecx, Map::kBitFieldOffset));
    __ and_(ecx, Immediate(kSlowCaseBitFieldMask));
    __ cmp(ecx, Immediate(1 << Map::kHasIndexedInterceptor));
    __ j(not_zero, &slow);
  
    // Everything is fine, call runtime.
    __ pop(ecx);
    __ push(edx);  // receiver
    __ push(eax);  // key
    __ push(ecx);  // return address
  
    // Perform tail call to the entry.
    ExternalReference ref =
        ExternalReference(IC_Utility(kKeyedLoadPropertyWithInterceptor),
                          masm->isolate());
    __ TailCallExternalReference(ref, 2, 1);
  
    __ bind(&slow);
    GenerateMiss(masm, false);
  }
  
  
  void KeyedLoadIC::GenerateNonStrictArguments(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- eax    : key
    //  -- edx    : receiver
    //  -- esp[0] : return address
    // -----------------------------------
    Label slow, notin;
    Factory* factory = masm->isolate()->factory();
    Operand mapped_location =
        GenerateMappedArgumentsLookup(masm, edx, eax, ebx, ecx, &notin, &slow);
    __ mov(eax, mapped_location);
    __ Ret();
    __ bind(&notin);
    // The unmapped lookup expects that the parameter map is in ebx.
    Operand unmapped_location =
        GenerateUnmappedArgumentsLookup(masm, eax, ebx, ecx, &slow);
    __ cmp(unmapped_location, factory->the_hole_value());
    __ j(equal, &slow);
    __ mov(eax, unmapped_location);
    __ Ret();
    __ bind(&slow);
    GenerateMiss(masm, false);
  }
  
  
  void KeyedStoreIC::GenerateNonStrictArguments(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- eax    : value
    //  -- ecx    : key
    //  -- edx    : receiver
    //  -- esp[0] : return address
    // -----------------------------------
    Label slow, notin;
    Operand mapped_location =
        GenerateMappedArgumentsLookup(masm, edx, ecx, ebx, edi, &notin, &slow);
    __ mov(mapped_location, eax);
    __ lea(ecx, mapped_location);
    __ mov(edx, eax);
    __ RecordWrite(ebx, ecx, edx, kDontSaveFPRegs);
    __ Ret();
    __ bind(&notin);
    // The unmapped lookup expects that the parameter map is in ebx.
    Operand unmapped_location =
        GenerateUnmappedArgumentsLookup(masm, ecx, ebx, edi, &slow);
    __ mov(unmapped_location, eax);
    __ lea(edi, unmapped_location);
    __ mov(edx, eax);
    __ RecordWrite(ebx, edi, edx, kDontSaveFPRegs);
    __ Ret();
    __ bind(&slow);
    GenerateMiss(masm, false);
  }
  
  
  void KeyedStoreIC::GenerateGeneric(MacroAssembler* masm,
                                     StrictModeFlag strict_mode) {
    // ----------- S t a t e -------------
    //  -- eax    : value
    //  -- ecx    : key
    //  -- edx    : receiver
    //  -- esp[0] : return address
    // -----------------------------------
    Label slow, fast_object_with_map_check, fast_object_without_map_check;
    Label fast_double_with_map_check, fast_double_without_map_check;
    Label check_if_double_array, array, extra;
  
    // Check that the object isn't a smi.
    __ JumpIfSmi(edx, &slow);
    // Get the map from the receiver.
    __ mov(edi, FieldOperand(edx, HeapObject::kMapOffset));
    // Check that the receiver does not require access checks.  We need
    // to do this because this generic stub does not perform map checks.
    __ test_b(FieldOperand(edi, Map::kBitFieldOffset),
              1 << Map::kIsAccessCheckNeeded);
    __ j(not_zero, &slow);
    // Check that the key is a smi.
    __ JumpIfNotSmi(ecx, &slow);
    __ CmpInstanceType(edi, JS_ARRAY_TYPE);
    __ j(equal, &array);
    // Check that the object is some kind of JSObject.
    __ CmpInstanceType(edi, FIRST_JS_OBJECT_TYPE);
    __ j(below, &slow);
  
    // Object case: Check key against length in the elements array.
    // eax: value
    // edx: JSObject
    // ecx: key (a smi)
    // edi: receiver map
    __ mov(ebx, FieldOperand(edx, JSObject::kElementsOffset));
    // Check array bounds. Both the key and the length of FixedArray are smis.
    __ cmp(ecx, FieldOperand(ebx, FixedArray::kLengthOffset));
    __ j(below, &fast_object_with_map_check);
  
    // Slow case: call runtime.
    __ bind(&slow);
    GenerateRuntimeSetProperty(masm, strict_mode);
  
    // 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);
    // eax: value
    // edx: receiver, a JSArray
    // ecx: key, a smi.
    // ebx: receiver->elements, a FixedArray
    // edi: receiver map
    // flags: compare (ecx, edx.length())
    // do not leave holes in the array:
    __ j(not_equal, &slow);
    __ cmp(ecx, FieldOperand(ebx, FixedArray::kLengthOffset));
    __ j(above_equal, &slow);
    __ mov(edi, FieldOperand(ebx, HeapObject::kMapOffset));
    __ cmp(edi, masm->isolate()->factory()->fixed_array_map());
    __ j(not_equal, &check_if_double_array);
    // Add 1 to receiver->length, and go to common element store code for Objects.
    __ add(FieldOperand(edx, JSArray::kLengthOffset),
           Immediate(Smi::FromInt(1)));
    __ jmp(&fast_object_without_map_check);
  
    __ bind(&check_if_double_array);
    __ cmp(edi, masm->isolate()->factory()->fixed_double_array_map());
    __ j(not_equal, &slow);
    // Add 1 to receiver->length, and go to common element store code for doubles.
    __ add(FieldOperand(edx, JSArray::kLengthOffset),
           Immediate(Smi::FromInt(1)));
    __ jmp(&fast_double_without_map_check);
  
    // 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);
    // eax: value
    // edx: receiver, a JSArray
    // ecx: key, a smi.
    // edi: receiver map
    __ mov(ebx, FieldOperand(edx, JSObject::kElementsOffset));
  
    // Check the key against the length in the array and fall through to the
    // common store code.
    __ cmp(ecx, FieldOperand(edx, JSArray::kLengthOffset));  // Compare smis.
    __ j(above_equal, &extra);
  
    // Fast case: Do the store, could either Object or double.
    __ bind(&fast_object_with_map_check);
    // eax: value
    // ecx: key (a smi)
    // edx: receiver
    // ebx: FixedArray receiver->elements
    // edi: receiver map
    __ mov(edi, FieldOperand(ebx, HeapObject::kMapOffset));
    __ cmp(edi, masm->isolate()->factory()->fixed_array_map());
    __ j(not_equal, &fast_double_with_map_check);
    __ bind(&fast_object_without_map_check);
    // Smi stores don't require further checks.
    Label non_smi_value;
    __ JumpIfNotSmi(eax, &non_smi_value);
    // It's irrelevant whether array is smi-only or not when writing a smi.
    __ mov(CodeGenerator::FixedArrayElementOperand(ebx, ecx), eax);
    __ ret(0);
  
    __ bind(&non_smi_value);
    // Escape to slow case when writing non-smi into smi-only array.
    __ mov(edi, FieldOperand(edx, HeapObject::kMapOffset));
    __ CheckFastObjectElements(edi, &slow, Label::kNear);
  
    // Fast elements array, store the value to the elements backing store.
    __ mov(CodeGenerator::FixedArrayElementOperand(ebx, ecx), eax);
    // Update write barrier for the elements array address.
    __ mov(edx, eax);  // Preserve the value which is returned.
    __ RecordWriteArray(
        ebx, edx, ecx, kDontSaveFPRegs, EMIT_REMEMBERED_SET, OMIT_SMI_CHECK);
    __ ret(0);
  
    __ bind(&fast_double_with_map_check);
    // Check for fast double array case. If this fails, call through to the
    // runtime.
    __ cmp(edi, masm->isolate()->factory()->fixed_double_array_map());
    __ j(not_equal, &slow);
    __ bind(&fast_double_without_map_check);
    // If the value is a number, store it as a double in the FastDoubleElements
    // array.
    __ StoreNumberToDoubleElements(eax, ebx, ecx, edx, xmm0, &slow, false);
    __ ret(0);
  }
  
  
  // The generated code does not accept smi keys.
  // The generated code falls through if both probes miss.
  void CallICBase::GenerateMonomorphicCacheProbe(MacroAssembler* masm,
                                                 int argc,
                                                 Code::Kind kind,
                                                 Code::ExtraICState extra_state) {
    // ----------- S t a t e -------------
    //  -- ecx                 : name
    //  -- edx                 : receiver
    // -----------------------------------
    Label number, non_number, non_string, boolean, probe, miss;
  
    // Probe the stub cache.
    Code::Flags flags = Code::ComputeFlags(kind,
                                           MONOMORPHIC,
                                           extra_state,
                                           NORMAL,
                                           argc);
    Isolate* isolate = masm->isolate();
    isolate->stub_cache()->GenerateProbe(masm, flags, edx, ecx, ebx, eax);
  
    // If the stub cache probing failed, the receiver might be a value.
    // For value objects, we use the map of the prototype objects for
    // the corresponding JSValue for the cache and that is what we need
    // to probe.
    //
    // Check for number.
    __ JumpIfSmi(edx, &number);
    __ CmpObjectType(edx, HEAP_NUMBER_TYPE, ebx);
    __ j(not_equal, &non_number);
    __ bind(&number);
    StubCompiler::GenerateLoadGlobalFunctionPrototype(
        masm, Context::NUMBER_FUNCTION_INDEX, edx);
    __ jmp(&probe);
  
    // Check for string.
    __ bind(&non_number);
    __ CmpInstanceType(ebx, FIRST_NONSTRING_TYPE);
    __ j(above_equal, &non_string);
    StubCompiler::GenerateLoadGlobalFunctionPrototype(
        masm, Context::STRING_FUNCTION_INDEX, edx);
    __ jmp(&probe);
  
    // Check for boolean.
    __ bind(&non_string);
    __ cmp(edx, isolate->factory()->true_value());
    __ j(equal, &boolean);
    __ cmp(edx, isolate->factory()->false_value());
    __ j(not_equal, &miss);
    __ bind(&boolean);
    StubCompiler::GenerateLoadGlobalFunctionPrototype(
        masm, Context::BOOLEAN_FUNCTION_INDEX, edx);
  
    // Probe the stub cache for the value object.
    __ bind(&probe);
    isolate->stub_cache()->GenerateProbe(masm, flags, edx, ecx, ebx, no_reg);
    __ bind(&miss);
  }
  
  
  static void GenerateFunctionTailCall(MacroAssembler* masm,
                                       int argc,
                                       Label* miss) {
    // ----------- S t a t e -------------
    //  -- ecx                 : name
    //  -- edi                 : function
    //  -- esp[0]              : return address
    //  -- esp[(argc - n) * 4] : arg[n] (zero-based)
    //  -- ...
    //  -- esp[(argc + 1) * 4] : receiver
    // -----------------------------------
  
    // Check that the result is not a smi.
    __ JumpIfSmi(edi, miss);
  
    // Check that the value is a JavaScript function, fetching its map into eax.
    __ CmpObjectType(edi, JS_FUNCTION_TYPE, eax);
    __ j(not_equal, miss);
  
    // Invoke the function.
    ParameterCount actual(argc);
    __ InvokeFunction(edi, actual, JUMP_FUNCTION,
                      NullCallWrapper(), CALL_AS_METHOD);
  }
  
  
  // The generated code falls through if the call should be handled by runtime.
  void CallICBase::GenerateNormal(MacroAssembler* masm, int argc) {
    // ----------- S t a t e -------------
    //  -- ecx                 : name
    //  -- esp[0]              : return address
    //  -- esp[(argc - n) * 4] : arg[n] (zero-based)
    //  -- ...
    //  -- esp[(argc + 1) * 4] : receiver
    // -----------------------------------
    Label miss;
  
    // Get the receiver of the function from the stack; 1 ~ return address.
    __ mov(edx, Operand(esp, (argc + 1) * kPointerSize));
  
    GenerateStringDictionaryReceiverCheck(masm, edx, eax, ebx, &miss);
  
    // eax: elements
    // Search the dictionary placing the result in edi.
    GenerateDictionaryLoad(masm, &miss, eax, ecx, edi, ebx, edi);
    GenerateFunctionTailCall(masm, argc, &miss);
  
    __ bind(&miss);
  }
  
  
  void CallICBase::GenerateMiss(MacroAssembler* masm,
                                int argc,
                                IC::UtilityId id,
                                Code::ExtraICState extra_state) {
    // ----------- S t a t e -------------
    //  -- ecx                 : name
    //  -- esp[0]              : return address
    //  -- esp[(argc - n) * 4] : arg[n] (zero-based)
    //  -- ...
    //  -- esp[(argc + 1) * 4] : receiver
    // -----------------------------------
  
    Counters* counters = masm->isolate()->counters();
    if (id == IC::kCallIC_Miss) {
      __ IncrementCounter(counters->call_miss(), 1);
    } else {
      __ IncrementCounter(counters->keyed_call_miss(), 1);
    }
  
    // Get the receiver of the function from the stack; 1 ~ return address.
    __ mov(edx, Operand(esp, (argc + 1) * kPointerSize));
  
    {
      FrameScope scope(masm, StackFrame::INTERNAL);
  
      // Push the receiver and the name of the function.
      __ push(edx);
      __ push(ecx);
  
      // Call the entry.
      CEntryStub stub(1);
      __ mov(eax, Immediate(2));
      __ mov(ebx, Immediate(ExternalReference(IC_Utility(id), masm->isolate())));
      __ CallStub(&stub);
  
      // Move result to edi and exit the internal frame.
      __ mov(edi, eax);
    }
  
    // Check if the receiver is a global object of some sort.
    // This can happen only for regular CallIC but not KeyedCallIC.
    if (id == IC::kCallIC_Miss) {
      Label invoke, global;
      __ mov(edx, Operand(esp, (argc + 1) * kPointerSize));  // receiver
      __ JumpIfSmi(edx, &invoke, Label::kNear);
      __ mov(ebx, FieldOperand(edx, HeapObject::kMapOffset));
      __ movzx_b(ebx, FieldOperand(ebx, Map::kInstanceTypeOffset));
      __ cmp(ebx, JS_GLOBAL_OBJECT_TYPE);
      __ j(equal, &global, Label::kNear);
      __ cmp(ebx, JS_BUILTINS_OBJECT_TYPE);
      __ j(not_equal, &invoke, Label::kNear);
  
      // Patch the receiver on the stack.
      __ bind(&global);
      __ mov(edx, FieldOperand(edx, GlobalObject::kGlobalReceiverOffset));
      __ mov(Operand(esp, (argc + 1) * kPointerSize), edx);
      __ bind(&invoke);
    }
  
    // Invoke the function.
    CallKind call_kind = CallICBase::Contextual::decode(extra_state)
        ? CALL_AS_FUNCTION
        : CALL_AS_METHOD;
    ParameterCount actual(argc);
    __ InvokeFunction(edi,
                      actual,
                      JUMP_FUNCTION,
                      NullCallWrapper(),
                      call_kind);
  }
  
  
  void CallIC::GenerateMegamorphic(MacroAssembler* masm,
                                   int argc,
                                   Code::ExtraICState extra_state) {
    // ----------- S t a t e -------------
    //  -- ecx                 : name
    //  -- esp[0]              : return address
    //  -- esp[(argc - n) * 4] : arg[n] (zero-based)
    //  -- ...
    //  -- esp[(argc + 1) * 4] : receiver
    // -----------------------------------
  
    // Get the receiver of the function from the stack; 1 ~ return address.
    __ mov(edx, Operand(esp, (argc + 1) * kPointerSize));
    CallICBase::GenerateMonomorphicCacheProbe(masm, argc, Code::CALL_IC,
                                              extra_state);
  
    GenerateMiss(masm, argc, extra_state);
  }
  
  
  void KeyedCallIC::GenerateMegamorphic(MacroAssembler* masm, int argc) {
    // ----------- S t a t e -------------
    //  -- ecx                 : name
    //  -- esp[0]              : return address
    //  -- esp[(argc - n) * 4] : arg[n] (zero-based)
    //  -- ...
    //  -- esp[(argc + 1) * 4] : receiver
    // -----------------------------------
  
    // Get the receiver of the function from the stack; 1 ~ return address.
    __ mov(edx, Operand(esp, (argc + 1) * kPointerSize));
  
    Label do_call, slow_call, slow_load, slow_reload_receiver;
    Label check_number_dictionary, check_string, lookup_monomorphic_cache;
    Label index_smi, index_string;
  
    // Check that the key is a smi.
    __ JumpIfNotSmi(ecx, &check_string);
  
    __ bind(&index_smi);
    // Now the key is known to be a smi. This place is also jumped to from
    // where a numeric string is converted to a smi.
  
    GenerateKeyedLoadReceiverCheck(
        masm, edx, eax, Map::kHasIndexedInterceptor, &slow_call);
  
    GenerateFastArrayLoad(
        masm, edx, ecx, eax, edi, &check_number_dictionary, &slow_load);
    Isolate* isolate = masm->isolate();
    Counters* counters = isolate->counters();
    __ IncrementCounter(counters->keyed_call_generic_smi_fast(), 1);
  
    __ bind(&do_call);
    // receiver in edx is not used after this point.
    // ecx: key
    // edi: function
    GenerateFunctionTailCall(masm, argc, &slow_call);
  
    __ bind(&check_number_dictionary);
    // eax: elements
    // ecx: smi key
    // Check whether the elements is a number dictionary.
    __ CheckMap(eax,
                isolate->factory()->hash_table_map(),
                &slow_load,
                DONT_DO_SMI_CHECK);
    __ mov(ebx, ecx);
    __ SmiUntag(ebx);
    // ebx: untagged index
    // Receiver in edx will be clobbered, need to reload it on miss.
    __ LoadFromNumberDictionary(
        &slow_reload_receiver, eax, ecx, ebx, edx, edi, edi);
    __ IncrementCounter(counters->keyed_call_generic_smi_dict(), 1);
    __ jmp(&do_call);
  
    __ bind(&slow_reload_receiver);
    __ mov(edx, Operand(esp, (argc + 1) * kPointerSize));
  
    __ bind(&slow_load);
    // This branch is taken when calling KeyedCallIC_Miss is neither required
    // nor beneficial.
    __ IncrementCounter(counters->keyed_call_generic_slow_load(), 1);
  
    {
      FrameScope scope(masm, StackFrame::INTERNAL);
      __ push(ecx);  // save the key
      __ push(edx);  // pass the receiver
      __ push(ecx);  // pass the key
      __ CallRuntime(Runtime::kKeyedGetProperty, 2);
      __ pop(ecx);  // restore the key
      // Leave the internal frame.
    }
  
    __ mov(edi, eax);
    __ jmp(&do_call);
  
    __ bind(&check_string);
    GenerateKeyStringCheck(masm, ecx, eax, ebx, &index_string, &slow_call);
  
    // The key is known to be a symbol.
    // If the receiver is a regular JS object with slow properties then do
    // a quick inline probe of the receiver's dictionary.
    // Otherwise do the monomorphic cache probe.
    GenerateKeyedLoadReceiverCheck(
        masm, edx, eax, Map::kHasNamedInterceptor, &lookup_monomorphic_cache);
  
    __ mov(ebx, FieldOperand(edx, JSObject::kPropertiesOffset));
    __ CheckMap(ebx,
                isolate->factory()->hash_table_map(),
                &lookup_monomorphic_cache,
                DONT_DO_SMI_CHECK);
  
    GenerateDictionaryLoad(masm, &slow_load, ebx, ecx, eax, edi, edi);
    __ IncrementCounter(counters->keyed_call_generic_lookup_dict(), 1);
    __ jmp(&do_call);
  
    __ bind(&lookup_monomorphic_cache);
    __ IncrementCounter(counters->keyed_call_generic_lookup_cache(), 1);
    CallICBase::GenerateMonomorphicCacheProbe(masm, argc, Code::KEYED_CALL_IC,
                                              Code::kNoExtraICState);
    // Fall through on miss.
  
    __ bind(&slow_call);
    // This branch is taken if:
    // - the receiver requires boxing or access check,
    // - the key is neither smi nor symbol,
    // - the value loaded is not a function,
    // - there is hope that the runtime will create a monomorphic call stub
    //   that will get fetched next time.
    __ IncrementCounter(counters->keyed_call_generic_slow(), 1);
    GenerateMiss(masm, argc);
  
    __ bind(&index_string);
    __ IndexFromHash(ebx, ecx);
    // Now jump to the place where smi keys are handled.
    __ jmp(&index_smi);
  }
  
  
  void KeyedCallIC::GenerateNonStrictArguments(MacroAssembler* masm,
                                               int argc) {
    // ----------- S t a t e -------------
    //  -- ecx                 : name
    //  -- esp[0]              : return address
    //  -- esp[(argc - n) * 4] : arg[n] (zero-based)
    //  -- ...
    //  -- esp[(argc + 1) * 4] : receiver
    // -----------------------------------
    Label slow, notin;
    Factory* factory = masm->isolate()->factory();
    __ mov(edx, Operand(esp, (argc + 1) * kPointerSize));
    Operand mapped_location =
        GenerateMappedArgumentsLookup(masm, edx, ecx, ebx, eax, &notin, &slow);
    __ mov(edi, mapped_location);
    GenerateFunctionTailCall(masm, argc, &slow);
    __ bind(&notin);
    // The unmapped lookup expects that the parameter map is in ebx.
    Operand unmapped_location =
        GenerateUnmappedArgumentsLookup(masm, ecx, ebx, eax, &slow);
    __ cmp(unmapped_location, factory->the_hole_value());
    __ j(equal, &slow);
    __ mov(edi, unmapped_location);
    GenerateFunctionTailCall(masm, argc, &slow);
    __ bind(&slow);
    GenerateMiss(masm, argc);
  }
  
  
  void KeyedCallIC::GenerateNormal(MacroAssembler* masm, int argc) {
    // ----------- S t a t e -------------
    //  -- ecx                 : name
    //  -- esp[0]              : return address
    //  -- esp[(argc - n) * 4] : arg[n] (zero-based)
    //  -- ...
    //  -- esp[(argc + 1) * 4] : receiver
    // -----------------------------------
  
    // Check if the name is a string.
    Label miss;
    __ JumpIfSmi(ecx, &miss);
    Condition cond = masm->IsObjectStringType(ecx, eax, eax);
    __ j(NegateCondition(cond), &miss);
    CallICBase::GenerateNormal(masm, argc);
    __ bind(&miss);
    GenerateMiss(masm, argc);
  }
  
  
  void LoadIC::GenerateMegamorphic(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- eax    : receiver
    //  -- ecx    : name
    //  -- esp[0] : return address
    // -----------------------------------
  
    // Probe the stub cache.
    Code::Flags flags = Code::ComputeFlags(Code::LOAD_IC, MONOMORPHIC);
    Isolate::Current()->stub_cache()->GenerateProbe(masm, flags, eax, ecx, ebx,
                                                    edx);
  
    // Cache miss: Jump to runtime.
    GenerateMiss(masm);
  }
  
  
  void LoadIC::GenerateNormal(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- eax    : receiver
    //  -- ecx    : name
    //  -- esp[0] : return address
    // -----------------------------------
    Label miss;
  
    GenerateStringDictionaryReceiverCheck(masm, eax, edx, ebx, &miss);
  
    // edx: elements
    // Search the dictionary placing the result in eax.
    GenerateDictionaryLoad(masm, &miss, edx, ecx, edi, ebx, eax);
    __ ret(0);
  
    // Cache miss: Jump to runtime.
    __ bind(&miss);
    GenerateMiss(masm);
  }
  
  
  void LoadIC::GenerateMiss(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- eax    : receiver
    //  -- ecx    : name
    //  -- esp[0] : return address
    // -----------------------------------
  
    __ IncrementCounter(masm->isolate()->counters()->load_miss(), 1);
  
    __ pop(ebx);
    __ push(eax);  // receiver
    __ push(ecx);  // name
    __ push(ebx);  // return address
  
    // Perform tail call to the entry.
    ExternalReference ref =
        ExternalReference(IC_Utility(kLoadIC_Miss), masm->isolate());
    __ TailCallExternalReference(ref, 2, 1);
  }
  
  
  void KeyedLoadIC::GenerateMiss(MacroAssembler* masm, bool force_generic) {
    // ----------- S t a t e -------------
    //  -- eax    : key
    //  -- edx    : receiver
    //  -- esp[0] : return address
    // -----------------------------------
  
    __ IncrementCounter(masm->isolate()->counters()->keyed_load_miss(), 1);
  
    __ pop(ebx);
    __ push(edx);  // receiver
    __ push(eax);  // name
    __ push(ebx);  // return address
  
    // Perform tail call to the entry.
    ExternalReference ref = force_generic
        ? ExternalReference(IC_Utility(kKeyedLoadIC_MissForceGeneric),
                            masm->isolate())
        : ExternalReference(IC_Utility(kKeyedLoadIC_Miss), masm->isolate());
    __ TailCallExternalReference(ref, 2, 1);
  }
  
  
  void KeyedLoadIC::GenerateRuntimeGetProperty(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- eax    : key
    //  -- edx    : receiver
    //  -- esp[0] : return address
    // -----------------------------------
  
    __ pop(ebx);
    __ push(edx);  // receiver
    __ push(eax);  // name
    __ push(ebx);  // return address
  
    // Perform tail call to the entry.
    __ TailCallRuntime(Runtime::kKeyedGetProperty, 2, 1);
  }
  
  
  void StoreIC::GenerateMegamorphic(MacroAssembler* masm,
                                    StrictModeFlag strict_mode) {
    // ----------- S t a t e -------------
    //  -- eax    : value
    //  -- ecx    : name
    //  -- edx    : receiver
    //  -- esp[0] : return address
    // -----------------------------------
  
    Code::Flags flags =
        Code::ComputeFlags(Code::STORE_IC, MONOMORPHIC, strict_mode);
    Isolate::Current()->stub_cache()->GenerateProbe(masm, flags, edx, ecx, ebx,
                                                    no_reg);
  
    // Cache miss: Jump to runtime.
    GenerateMiss(masm);
  }
  
  
  void StoreIC::GenerateMiss(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- eax    : value
    //  -- ecx    : name
    //  -- edx    : receiver
    //  -- esp[0] : return address
    // -----------------------------------
  
    __ pop(ebx);
    __ push(edx);
    __ push(ecx);
    __ push(eax);
    __ push(ebx);
  
    // Perform tail call to the entry.
    ExternalReference ref =
        ExternalReference(IC_Utility(kStoreIC_Miss), masm->isolate());
    __ TailCallExternalReference(ref, 3, 1);
  }
  
  
  void StoreIC::GenerateArrayLength(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- eax    : value
    //  -- ecx    : name
    //  -- edx    : receiver
    //  -- esp[0] : return address
    // -----------------------------------
    //
    // This accepts as a receiver anything JSArray::SetElementsLength accepts
    // (currently anything except for external arrays which means anything with
    // elements of FixedArray type).  Value must be a number, but only smis are
    // accepted as the most common case.
  
    Label miss;
  
    Register receiver = edx;
    Register value = eax;
    Register scratch = ebx;
  
    // Check that the receiver isn't a smi.
    __ JumpIfSmi(receiver, &miss);
  
    // Check that the object is a JS array.
    __ CmpObjectType(receiver, JS_ARRAY_TYPE, scratch);
    __ j(not_equal, &miss);
  
    // Check that elements are FixedArray.
    // We rely on StoreIC_ArrayLength below to deal with all types of
    // fast elements (including COW).
    __ mov(scratch, FieldOperand(receiver, JSArray::kElementsOffset));
    __ CmpObjectType(scratch, FIXED_ARRAY_TYPE, scratch);
    __ j(not_equal, &miss);
  
    // Check that the array has fast properties, otherwise the length
    // property might have been redefined.
    __ mov(scratch, FieldOperand(receiver, JSArray::kPropertiesOffset));
    __ CompareRoot(FieldOperand(scratch, FixedArray::kMapOffset),
                   Heap::kHashTableMapRootIndex);
    __ j(equal, &miss);
  
    // Check that value is a smi.
    __ JumpIfNotSmi(value, &miss);
  
    // Prepare tail call to StoreIC_ArrayLength.
    __ pop(scratch);
    __ push(receiver);
    __ push(value);
    __ push(scratch);  // return address
  
    ExternalReference ref =
        ExternalReference(IC_Utility(kStoreIC_ArrayLength), masm->isolate());
    __ TailCallExternalReference(ref, 2, 1);
  
    __ bind(&miss);
  
    GenerateMiss(masm);
  }
  
  
  void StoreIC::GenerateNormal(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- eax    : value
    //  -- ecx    : name
    //  -- edx    : receiver
    //  -- esp[0] : return address
    // -----------------------------------
  
    Label miss, restore_miss;
  
    GenerateStringDictionaryReceiverCheck(masm, edx, ebx, edi, &miss);
  
    // A lot of registers are needed for storing to slow case
    // objects. Push and restore receiver but rely on
    // GenerateDictionaryStore preserving the value and name.
    __ push(edx);
    GenerateDictionaryStore(masm, &restore_miss, ebx, ecx, eax, edx, edi);
    __ Drop(1);
    Counters* counters = masm->isolate()->counters();
    __ IncrementCounter(counters->store_normal_hit(), 1);
    __ ret(0);
  
    __ bind(&restore_miss);
    __ pop(edx);
  
    __ bind(&miss);
    __ IncrementCounter(counters->store_normal_miss(), 1);
    GenerateMiss(masm);
  }
  
  
  void StoreIC::GenerateGlobalProxy(MacroAssembler* masm,
                                    StrictModeFlag strict_mode) {
    // ----------- S t a t e -------------
    //  -- eax    : value
    //  -- ecx    : name
    //  -- edx    : receiver
    //  -- esp[0] : return address
    // -----------------------------------
    __ pop(ebx);
    __ push(edx);
    __ push(ecx);
    __ push(eax);
    __ push(Immediate(Smi::FromInt(NONE)));  // PropertyAttributes
    __ push(Immediate(Smi::FromInt(strict_mode)));
    __ push(ebx);  // return address
  
    // Do tail-call to runtime routine.
    __ TailCallRuntime(Runtime::kSetProperty, 5, 1);
  }
  
  
  void KeyedStoreIC::GenerateRuntimeSetProperty(MacroAssembler* masm,
                                                StrictModeFlag strict_mode) {
    // ----------- S t a t e -------------
    //  -- eax    : value
    //  -- ecx    : key
    //  -- edx    : receiver
    //  -- esp[0] : return address
    // -----------------------------------
  
    __ pop(ebx);
    __ push(edx);
    __ push(ecx);
    __ push(eax);
    __ push(Immediate(Smi::FromInt(NONE)));         // PropertyAttributes
    __ push(Immediate(Smi::FromInt(strict_mode)));  // Strict mode.
    __ push(ebx);   // return address
  
    // Do tail-call to runtime routine.
    __ TailCallRuntime(Runtime::kSetProperty, 5, 1);
  }
  
  
  void KeyedStoreIC::GenerateMiss(MacroAssembler* masm, bool force_generic) {
    // ----------- S t a t e -------------
    //  -- eax    : value
    //  -- ecx    : key
    //  -- edx    : receiver
    //  -- esp[0] : return address
    // -----------------------------------
  
    __ pop(ebx);
    __ push(edx);
    __ push(ecx);
    __ push(eax);
    __ push(ebx);
  
    // Do tail-call to runtime routine.
    ExternalReference ref = force_generic
        ? ExternalReference(IC_Utility(kKeyedStoreIC_MissForceGeneric),
                            masm->isolate())
        : ExternalReference(IC_Utility(kKeyedStoreIC_Miss), masm->isolate());
    __ TailCallExternalReference(ref, 3, 1);
  }
  
  
  void KeyedStoreIC::GenerateSlow(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- eax    : value
    //  -- ecx    : key
    //  -- edx    : receiver
    //  -- esp[0] : return address
    // -----------------------------------
  
    __ pop(ebx);
    __ push(edx);
    __ push(ecx);
    __ push(eax);
    __ push(ebx);   // return address
  
    // Do tail-call to runtime routine.
    ExternalReference ref(IC_Utility(kKeyedStoreIC_Slow), masm->isolate());
    __ TailCallExternalReference(ref, 3, 1);
  }
  
  
  void KeyedStoreIC::GenerateTransitionElementsSmiToDouble(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- ebx    : target map
    //  -- edx    : receiver
    //  -- esp[0] : return address
    // -----------------------------------
    // Must return the modified receiver in eax.
    if (!FLAG_trace_elements_transitions) {
      Label fail;
      ElementsTransitionGenerator::GenerateSmiOnlyToDouble(masm, &fail);
      __ mov(eax, edx);
      __ Ret();
      __ bind(&fail);
    }
  
    __ pop(ebx);
    __ push(edx);
    __ push(ebx);  // return address
    __ TailCallRuntime(Runtime::kTransitionElementsSmiToDouble, 1, 1);
  }
  
  
  void KeyedStoreIC::GenerateTransitionElementsDoubleToObject(
      MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- ebx    : target map
    //  -- edx    : receiver
    //  -- esp[0] : return address
    // -----------------------------------
    // Must return the modified receiver in eax.
    if (!FLAG_trace_elements_transitions) {
      Label fail;
      ElementsTransitionGenerator::GenerateDoubleToObject(masm, &fail);
      __ mov(eax, edx);
      __ Ret();
      __ bind(&fail);
    }
  
    __ pop(ebx);
    __ push(edx);
    __ push(ebx);  // return address
    __ TailCallRuntime(Runtime::kTransitionElementsDoubleToObject, 1, 1);
  }
  
  
  #undef __
  
  
  Condition CompareIC::ComputeCondition(Token::Value op) {
    switch (op) {
      case Token::EQ_STRICT:
      case Token::EQ:
        return equal;
      case Token::LT:
        return less;
      case Token::GT:
        return greater;
      case Token::LTE:
        return less_equal;
      case Token::GTE:
        return greater_equal;
      default:
        UNREACHABLE();
        return no_condition;
    }
  }
  
  
  static bool HasInlinedSmiCode(Address address) {
    // The address of the instruction following the call.
    Address test_instruction_address =
        address + Assembler::kCallTargetAddressOffset;
  
    // If the instruction following the call is not a test al, nothing
    // was inlined.
    return *test_instruction_address == Assembler::kTestAlByte;
  }
  
  
  void CompareIC::UpdateCaches(Handle<Object> x, Handle<Object> y) {
    HandleScope scope;
    Handle<Code> rewritten;
    State previous_state = GetState();
  
    State state = TargetState(previous_state, HasInlinedSmiCode(address()), x, y);
    if (state == GENERIC) {
      CompareStub stub(GetCondition(), strict(), NO_COMPARE_FLAGS);
      rewritten = stub.GetCode();
    } else {
      ICCompareStub stub(op_, state);
      if (state == KNOWN_OBJECTS) {
        stub.set_known_map(Handle<Map>(Handle<JSObject>::cast(x)->map()));
      }
      rewritten = stub.GetCode();
    }
    set_target(*rewritten);
  
  #ifdef DEBUG
    if (FLAG_trace_ic) {
      PrintF("[CompareIC (%s->%s)#%s]\n",
             GetStateName(previous_state),
             GetStateName(state),
             Token::Name(op_));
    }
  #endif
  
    // Activate inlined smi code.
    if (previous_state == UNINITIALIZED) {
      PatchInlinedSmiCode(address());
    }
  }
  
  
  void PatchInlinedSmiCode(Address address) {
    // The address of the instruction following the call.
    Address test_instruction_address =
        address + Assembler::kCallTargetAddressOffset;
  
    // If the instruction following the call is not a test al, nothing
    // was inlined.
    if (*test_instruction_address != Assembler::kTestAlByte) {
      ASSERT(*test_instruction_address == Assembler::kNopByte);
      return;
    }
  
    Address delta_address = test_instruction_address + 1;
    // The delta to the start of the map check instruction and the
    // condition code uses at the patched jump.
    int8_t delta = *reinterpret_cast<int8_t*>(delta_address);
    if (FLAG_trace_ic) {
      PrintF("[  patching ic at %p, test=%p, delta=%d\n",
             address, test_instruction_address, delta);
    }
  
    // Patch with a short conditional jump. There must be a
    // short jump-if-carry/not-carry at this position.
    Address jmp_address = test_instruction_address - delta;
    ASSERT(*jmp_address == Assembler::kJncShortOpcode ||
           *jmp_address == Assembler::kJcShortOpcode);
    Condition cc = *jmp_address == Assembler::kJncShortOpcode
        ? not_zero
        : zero;
    *jmp_address = static_cast<byte>(Assembler::kJccShortPrefix | cc);
  }
  
  
  } }  // namespace v8::internal
  
  #endif  // V8_TARGET_ARCH_IA32
  