[ic] Delete old KeyedLoadIC code

src/ic/mips/ic-mips.cc

 // 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_MIPS
 
 #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.
-  __ Branch(global_object, eq, type, Operand(JS_GLOBAL_OBJECT_TYPE));
-  __ Branch(global_object, eq, type, Operand(JS_GLOBAL_PROXY_TYPE));
-}
-
-
 // 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
@@ skipping 80 matching lines @@
   const int kValueOffset = kElementsStartOffset + kPointerSize;
   __ Addu(scratch2, scratch2, Operand(kValueOffset - kHeapObjectTag));
   __ sw(value, MemOperand(scratch2));
 
   // Update the write barrier. Make sure not to clobber the value.
   __ mov(scratch1, value);
   __ RecordWrite(elements, scratch2, scratch1, kRAHasNotBeenSaved,
                  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.
-  __ lw(map, FieldMemOperand(receiver, HeapObject::kMapOffset));
-  // Check bit field.
-  __ lbu(scratch, FieldMemOperand(map, Map::kBitFieldOffset));
-  __ And(at, scratch,
-         Operand((1 << Map::kIsAccessCheckNeeded) | (1 << interceptor_bit)));
-  __ Branch(slow, ne, at, Operand(zero_reg));
-  // 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);
-  __ lbu(scratch, FieldMemOperand(map, Map::kInstanceTypeOffset));
-  __ Branch(slow, lt, scratch, Operand(JS_OBJECT_TYPE));
-}
-
-
-// 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;
-
-  __ lw(elements, FieldMemOperand(receiver, JSObject::kElementsOffset));
-  __ AssertFastElements(elements);
-
-  // Check that the key (index) is within bounds.
-  __ lw(scratch1, FieldMemOperand(elements, FixedArray::kLengthOffset));
-  __ Branch(&in_bounds, lo, key, Operand(scratch1));
-  // Out-of-bounds. Check the prototype chain to see if we can just return
-  // 'undefined'.
-  // Negative keys can't take the fast OOB path.
-  __ Branch(slow, lt, key, Operand(zero_reg));
-  __ bind(&check_prototypes);
-  __ lw(scratch2, FieldMemOperand(receiver, HeapObject::kMapOffset));
-  __ bind(&check_next_prototype);
-  __ lw(scratch2, FieldMemOperand(scratch2, Map::kPrototypeOffset));
-  // scratch2: current prototype
-  __ LoadRoot(at, Heap::kNullValueRootIndex);
-  __ Branch(&absent, eq, scratch2, Operand(at));
-  __ lw(elements, FieldMemOperand(scratch2, JSObject::kElementsOffset));
-  __ lw(scratch2, FieldMemOperand(scratch2, HeapObject::kMapOffset));
-  // elements: elements of current prototype
-  // scratch2: map of current prototype
-  __ lbu(scratch1, FieldMemOperand(scratch2, Map::kInstanceTypeOffset));
-  __ Branch(slow, lo, scratch1, Operand(JS_OBJECT_TYPE));
-  __ lbu(scratch1, FieldMemOperand(scratch2, Map::kBitFieldOffset));
-  __ And(at, scratch1, Operand((1 << Map::kIsAccessCheckNeeded) |
-                               (1 << Map::kHasIndexedInterceptor)));
-  __ Branch(slow, ne, at, Operand(zero_reg));
-  __ LoadRoot(at, Heap::kEmptyFixedArrayRootIndex);
-  __ Branch(slow, ne, elements, Operand(at));
-  __ Branch(&check_next_prototype);
-
-  __ bind(&absent);
-  __ LoadRoot(result, Heap::kUndefinedValueRootIndex);
-  __ Branch(&done);
-
-  __ bind(&in_bounds);
-  // Fast case: Do the load.
-  __ Addu(scratch1, elements,
-          Operand(FixedArray::kHeaderSize - kHeapObjectTag));
-  // The key is a smi.
-  STATIC_ASSERT(kSmiTag == 0 && kSmiTagSize < kPointerSizeLog2);
-  __ Lsa(at, scratch1, key, kPointerSizeLog2 - kSmiTagSize);
-  __ lw(scratch2, MemOperand(at));
-
-  __ LoadRoot(at, Heap::kTheHoleValueRootIndex);
-  // In case the loaded value is the_hole we have to check the prototype chain.
-  __ Branch(&check_prototypes, eq, scratch2, Operand(at));
-  __ Move(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?
-  __ GetObjectType(key, map, hash);
-  __ Branch(not_unique, hi, hash, Operand(LAST_UNIQUE_NAME_TYPE));
-  STATIC_ASSERT(LAST_UNIQUE_NAME_TYPE == FIRST_NONSTRING_TYPE);
-  __ Branch(&unique, eq, hash, Operand(LAST_UNIQUE_NAME_TYPE));
-
-  // Is the string an array index, with cached numeric value?
-  __ lw(hash, FieldMemOperand(key, Name::kHashFieldOffset));
-  __ And(at, hash, Operand(Name::kContainsCachedArrayIndexMask));
-  __ Branch(index_string, eq, at, Operand(zero_reg));
-
-  // Is the string internalized? We know it's a string, so a single
-  // bit test is enough.
-  // map: key map
-  __ lbu(hash, FieldMemOperand(map, Map::kInstanceTypeOffset));
-  STATIC_ASSERT(kInternalizedTag == 0);
-  __ And(at, hash, Operand(kIsNotInternalizedMask));
-  __ Branch(not_unique, ne, at, Operand(zero_reg));
-
-  __ bind(&unique);
-}
-
 void LoadIC::GenerateNormal(MacroAssembler* masm) {
   Register dictionary = a0;
   DCHECK(!dictionary.is(LoadDescriptor::ReceiverRegister()));
   DCHECK(!dictionary.is(LoadDescriptor::NameRegister()));
 
   Label slow;
 
   __ lw(dictionary, FieldMemOperand(LoadDescriptor::ReceiverRegister(),
                                     JSObject::kPropertiesOffset));
   GenerateDictionaryLoad(masm, &slow, dictionary,
@@ skipping 61 matching lines @@
 
 void KeyedLoadIC::GenerateRuntimeGetProperty(MacroAssembler* masm) {
   // The return address is in ra.
 
   __ Push(LoadDescriptor::ReceiverRegister(), LoadDescriptor::NameRegister());
 
   // Do tail-call to runtime routine.
   __ TailCallRuntime(Runtime::kKeyedGetProperty);
 }
 
-void KeyedLoadIC::GenerateMegamorphic(MacroAssembler* masm) {
-  // The return address is in ra.
-  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(a2));
-  DCHECK(receiver.is(a1));
-
-  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, a0, a3,
-                                 Map::kHasIndexedInterceptor, &slow);
-
-  // Check the receiver's map to see if it has fast elements.
-  __ CheckFastElements(a0, a3, &check_number_dictionary);
-
-  GenerateFastArrayLoad(masm, receiver, key, a0, a3, t0, v0, &slow);
-  __ IncrementCounter(isolate->counters()->ic_keyed_load_generic_smi(), 1, t0,
-                      a3);
-  __ Ret();
-
-  __ bind(&check_number_dictionary);
-  __ lw(t0, FieldMemOperand(receiver, JSObject::kElementsOffset));
-  __ lw(a3, FieldMemOperand(t0, JSObject::kMapOffset));
-
-  // Check whether the elements is a number dictionary.
-  // a3: elements map
-  // t0: elements
-  __ LoadRoot(at, Heap::kHashTableMapRootIndex);
-  __ Branch(&slow, ne, a3, Operand(at));
-  __ sra(a0, key, kSmiTagSize);
-  __ LoadFromNumberDictionary(&slow, t0, key, v0, a0, a3, t1);
-  __ Ret();
-
-  // Slow case, key and receiver still in a2 and a1.
-  __ bind(&slow);
-  __ IncrementCounter(isolate->counters()->ic_keyed_load_generic_slow(), 1, t0,
-                      a3);
-  GenerateRuntimeGetProperty(masm);
-
-  __ bind(&check_name);
-  GenerateKeyNameCheck(masm, key, a0, a3, &index_name, &slow);
-
-  GenerateKeyedLoadReceiverCheck(masm, receiver, a0, a3,
-                                 Map::kHasNamedInterceptor, &slow);
-
-
-  // If the receiver is a fast-case object, check the stub cache. Otherwise
-  // probe the dictionary.
-  __ lw(a3, FieldMemOperand(receiver, JSObject::kPropertiesOffset));
-  __ lw(t0, FieldMemOperand(a3, HeapObject::kMapOffset));
-  __ LoadRoot(at, Heap::kHashTableMapRootIndex);
-  __ Branch(&probe_dictionary, eq, t0, Operand(at));
-
-  // 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, t0, t1, t2, t5));
-  Handle<TypeFeedbackVector> dummy_vector =
-      TypeFeedbackVector::DummyVector(masm->isolate());
-  int slot_index = dummy_vector->GetIndex(
-      FeedbackVectorSlot(TypeFeedbackVector::kDummyKeyedLoadICSlot));
-  __ LoadRoot(vector, Heap::kDummyVectorRootIndex);
-  __ li(slot, Operand(Smi::FromInt(slot_index)));
-
-  masm->isolate()->load_stub_cache()->GenerateProbe(masm, receiver, key, t0, t1,
-                                                    t2, t5);
-  // Cache miss.
-  GenerateMiss(masm);
-
-  // Do a quick inline probe of the receiver's dictionary, if it
-  // exists.
-  __ bind(&probe_dictionary);
-  // a3: elements
-  __ lw(a0, FieldMemOperand(receiver, HeapObject::kMapOffset));
-  __ lbu(a0, FieldMemOperand(a0, Map::kInstanceTypeOffset));
-  GenerateGlobalInstanceTypeCheck(masm, a0, &slow);
-  // Load the property to v0.
-  GenerateDictionaryLoad(masm, &slow, a3, key, v0, t1, t0);
-  __ IncrementCounter(isolate->counters()->ic_keyed_load_generic_symbol(), 1,
-                      t0, a3);
-  __ Ret();
-
-  __ bind(&index_name);
-  __ IndexFromHash(a3, key);
-  // Now jump to the place where smi keys are handled.
-  __ Branch(&index_smi);
-}
-
-
 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.
@@ skipping 435 matching lines @@
       break;
     default:
       UNIMPLEMENTED();
   }
   patcher.ChangeBranchCondition(branch_instr, opcode);
 }
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS