[es6] Reintroduce the instanceof operator in the backends.

src/arm64/code-stubs-arm64.cc

Index: src/arm64/code-stubs-arm64.cc
diff --git a/src/arm64/code-stubs-arm64.cc b/src/arm64/code-stubs-arm64.cc
index e36e4f9dcca6419a7ca6dab39fbd361bf50d5e77..a96b3dfa9833285d67ebdb60384c6c533680e735 100644
--- a/src/arm64/code-stubs-arm64.cc
+++ b/src/arm64/code-stubs-arm64.cc
@@ -1504,123 +1504,6 @@ void LoadIndexedStringStub::Generate(MacroAssembler* masm) {
 }
 
 
-void InstanceOfStub::Generate(MacroAssembler* masm) {
-  Register const object = x1;              // Object (lhs).
-  Register const function = x0;            // Function (rhs).
-  Register const object_map = x2;          // Map of {object}.
-  Register const function_map = x3;        // Map of {function}.
-  Register const function_prototype = x4;  // Prototype of {function}.
-  Register const scratch = x5;
-
-  DCHECK(object.is(InstanceOfDescriptor::LeftRegister()));
-  DCHECK(function.is(InstanceOfDescriptor::RightRegister()));
-
-  // Check if {object} is a smi.
-  Label object_is_smi;
-  __ JumpIfSmi(object, &object_is_smi);
-
-  // Lookup the {function} and the {object} map in the global instanceof cache.
-  // Note: This is safe because we clear the global instanceof cache whenever
-  // we change the prototype of any object.
-  Label fast_case, slow_case;
-  __ Ldr(object_map, FieldMemOperand(object, HeapObject::kMapOffset));
-  __ JumpIfNotRoot(function, Heap::kInstanceofCacheFunctionRootIndex,
-                   &fast_case);
-  __ JumpIfNotRoot(object_map, Heap::kInstanceofCacheMapRootIndex, &fast_case);
-  __ LoadRoot(x0, Heap::kInstanceofCacheAnswerRootIndex);
-  __ Ret();
-
-  // If {object} is a smi we can safely return false if {function} is a JS
-  // function, otherwise we have to miss to the runtime and throw an exception.
-  __ Bind(&object_is_smi);
-  __ JumpIfSmi(function, &slow_case);
-  __ JumpIfNotObjectType(function, function_map, scratch, JS_FUNCTION_TYPE,
-                         &slow_case);
-  __ LoadRoot(x0, Heap::kFalseValueRootIndex);
-  __ Ret();
-
-  // Fast-case: The {function} must be a valid JSFunction.
-  __ Bind(&fast_case);
-  __ JumpIfSmi(function, &slow_case);
-  __ JumpIfNotObjectType(function, function_map, scratch, JS_FUNCTION_TYPE,
-                         &slow_case);
-
-  // Go to the runtime if the function is not a constructor.
-  __ Ldrb(scratch, FieldMemOperand(function_map, Map::kBitFieldOffset));
-  __ Tbz(scratch, Map::kIsConstructor, &slow_case);
-
-  // Ensure that {function} has an instance prototype.
-  __ Tbnz(scratch, Map::kHasNonInstancePrototype, &slow_case);
-
-  // Get the "prototype" (or initial map) of the {function}.
-  __ Ldr(function_prototype,
-         FieldMemOperand(function, JSFunction::kPrototypeOrInitialMapOffset));
-  __ AssertNotSmi(function_prototype);
-
-  // Resolve the prototype if the {function} has an initial map.  Afterwards the
-  // {function_prototype} will be either the JSReceiver prototype object or the
-  // hole value, which means that no instances of the {function} were created so
-  // far and hence we should return false.
-  Label function_prototype_valid;
-  __ JumpIfNotObjectType(function_prototype, scratch, scratch, MAP_TYPE,
-                         &function_prototype_valid);
-  __ Ldr(function_prototype,
-         FieldMemOperand(function_prototype, Map::kPrototypeOffset));
-  __ Bind(&function_prototype_valid);
-  __ AssertNotSmi(function_prototype);
-
-  // Update the global instanceof cache with the current {object} map and
-  // {function}.  The cached answer will be set when it is known below.
-  __ StoreRoot(function, Heap::kInstanceofCacheFunctionRootIndex);
-  __ StoreRoot(object_map, Heap::kInstanceofCacheMapRootIndex);
-
-  // Loop through the prototype chain looking for the {function} prototype.
-  // Assume true, and change to false if not found.
-  Register const object_instance_type = function_map;
-  Register const map_bit_field = function_map;
-  Register const null = scratch;
-  Register const result = x0;
-
-  Label done, loop, fast_runtime_fallback;
-  __ LoadRoot(result, Heap::kTrueValueRootIndex);
-  __ LoadRoot(null, Heap::kNullValueRootIndex);
-  __ Bind(&loop);
-
-  // Check if the object needs to be access checked.
-  __ Ldrb(map_bit_field, FieldMemOperand(object_map, Map::kBitFieldOffset));
-  __ TestAndBranchIfAnySet(map_bit_field, 1 << Map::kIsAccessCheckNeeded,
-                           &fast_runtime_fallback);
-  // Check if the current object is a Proxy.
-  __ CompareInstanceType(object_map, object_instance_type, JS_PROXY_TYPE);
-  __ B(eq, &fast_runtime_fallback);
-
-  __ Ldr(object, FieldMemOperand(object_map, Map::kPrototypeOffset));
-  __ Cmp(object, function_prototype);
-  __ B(eq, &done);
-  __ Cmp(object, null);
-  __ Ldr(object_map, FieldMemOperand(object, HeapObject::kMapOffset));
-  __ B(ne, &loop);
-  __ LoadRoot(result, Heap::kFalseValueRootIndex);
-  __ Bind(&done);
-  __ StoreRoot(result, Heap::kInstanceofCacheAnswerRootIndex);
-  __ Ret();
-
-  // Found Proxy or access check needed: Call the runtime
-  __ Bind(&fast_runtime_fallback);
-  __ Push(object, function_prototype);
-  // Invalidate the instanceof cache.
-  __ Move(scratch, Smi::FromInt(0));
-  __ StoreRoot(scratch, Heap::kInstanceofCacheFunctionRootIndex);
-  __ TailCallRuntime(Runtime::kHasInPrototypeChain);
-
-  // Slow-case: Call the %InstanceOf runtime function.
-  __ bind(&slow_case);
-  __ Push(object, function);
-  __ TailCallRuntime(is_es6_instanceof() ? Runtime::kOrdinaryHasInstance
-                                         : Runtime::kInstanceOf);
-}
-
-
 void RegExpExecStub::Generate(MacroAssembler* masm) {
 #ifdef V8_INTERPRETED_REGEXP
   __ TailCallRuntime(Runtime::kRegExpExec);