[es6] Reintroduce the instanceof operator in the backends.

src/arm/code-stubs-arm.cc

Index: src/arm/code-stubs-arm.cc
diff --git a/src/arm/code-stubs-arm.cc b/src/arm/code-stubs-arm.cc
index 73a230e466e315ee01a80b2c48fad5858e3d04ee..fb46362d41c367aaafc40e548e82859eace0a35c 100644
--- a/src/arm/code-stubs-arm.cc
+++ b/src/arm/code-stubs-arm.cc
@@ -1319,126 +1319,6 @@ void JSEntryStub::Generate(MacroAssembler* masm) {
 }
 
 
-void InstanceOfStub::Generate(MacroAssembler* masm) {
-  Register const object = r1;              // Object (lhs).
-  Register const function = r0;            // Function (rhs).
-  Register const object_map = r2;          // Map of {object}.
-  Register const function_map = r3;        // Map of {function}.
-  Register const function_prototype = r4;  // Prototype of {function}.
-  Register const scratch = r5;
-
-  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));
-  __ CompareRoot(function, Heap::kInstanceofCacheFunctionRootIndex);
-  __ b(ne, &fast_case);
-  __ CompareRoot(object_map, Heap::kInstanceofCacheMapRootIndex);
-  __ b(ne, &fast_case);
-  __ LoadRoot(r0, 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);
-  __ CompareObjectType(function, function_map, scratch, JS_FUNCTION_TYPE);
-  __ b(ne, &slow_case);
-  __ LoadRoot(r0, Heap::kFalseValueRootIndex);
-  __ Ret();
-
-  // Fast-case: The {function} must be a valid JSFunction.
-  __ bind(&fast_case);
-  __ JumpIfSmi(function, &slow_case);
-  __ CompareObjectType(function, function_map, scratch, JS_FUNCTION_TYPE);
-  __ b(ne, &slow_case);
-
-  // Go to the runtime if the function is not a constructor.
-  __ ldrb(scratch, FieldMemOperand(function_map, Map::kBitFieldOffset));
-  __ tst(scratch, Operand(1 << Map::kIsConstructor));
-  __ b(eq, &slow_case);
-
-  // Ensure that {function} has an instance prototype.
-  __ tst(scratch, Operand(1 << Map::kHasNonInstancePrototype));
-  __ b(ne, &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;
-  __ CompareObjectType(function_prototype, scratch, scratch, MAP_TYPE);
-  __ b(ne, &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 = r0;
-
-  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));
-  __ tst(map_bit_field, Operand(1 << Map::kIsAccessCheckNeeded));
-  __ b(ne, &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 FunctionPrototypeStub::Generate(MacroAssembler* masm) {
   Label miss;
   Register receiver = LoadDescriptor::ReceiverRegister();