[es6] Reintroduce the instanceof operator in the backends.

src/x64/code-stubs-x64.cc

 // Copyright 2013 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_X64
 
 #include "src/code-stubs.h"
 #include "src/api-arguments.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 1984 matching lines @@
   __ popq(r13);
   __ popq(r12);
   __ addp(rsp, Immediate(2 * kPointerSize));  // remove markers
 
   // Restore frame pointer and return.
   __ popq(rbp);
   __ ret(0);
 }
 
 
-void InstanceOfStub::Generate(MacroAssembler* masm) {
-  Register const object = rdx;              // Object (lhs).
-  Register const function = rax;            // Function (rhs).
-  Register const object_map = rcx;          // Map of {object}.
-  Register const function_map = r8;         // Map of {function}.
-  Register const function_prototype = rdi;  // Prototype of {function}.
-
-  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, Label::kNear);
-
-  // 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;
-  __ movp(object_map, FieldOperand(object, HeapObject::kMapOffset));
-  __ CompareRoot(function, Heap::kInstanceofCacheFunctionRootIndex);
-  __ j(not_equal, &fast_case, Label::kNear);
-  __ CompareRoot(object_map, Heap::kInstanceofCacheMapRootIndex);
-  __ j(not_equal, &fast_case, Label::kNear);
-  __ LoadRoot(rax, Heap::kInstanceofCacheAnswerRootIndex);
-  __ ret(0);
-
-  // 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);
-  __ CmpObjectType(function, JS_FUNCTION_TYPE, function_map);
-  __ j(not_equal, &slow_case);
-  __ LoadRoot(rax, Heap::kFalseValueRootIndex);
-  __ ret(0);
-
-  // Fast-case: The {function} must be a valid JSFunction.
-  __ bind(&fast_case);
-  __ JumpIfSmi(function, &slow_case);
-  __ CmpObjectType(function, JS_FUNCTION_TYPE, function_map);
-  __ j(not_equal, &slow_case);
-
-  // Go to the runtime if the function is not a constructor.
-  __ testb(FieldOperand(function_map, Map::kBitFieldOffset),
-           Immediate(1 << Map::kIsConstructor));
-  __ j(zero, &slow_case);
-
-  // Ensure that {function} has an instance prototype.
-  __ testb(FieldOperand(function_map, Map::kBitFieldOffset),
-           Immediate(1 << Map::kHasNonInstancePrototype));
-  __ j(not_zero, &slow_case);
-
-  // Get the "prototype" (or initial map) of the {function}.
-  __ movp(function_prototype,
-          FieldOperand(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;
-  Register const function_prototype_map = kScratchRegister;
-  __ CmpObjectType(function_prototype, MAP_TYPE, function_prototype_map);
-  __ j(not_equal, &function_prototype_valid, Label::kNear);
-  __ movp(function_prototype,
-          FieldOperand(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.
-  Label done, loop, fast_runtime_fallback;
-  __ LoadRoot(rax, Heap::kTrueValueRootIndex);
-  __ bind(&loop);
-
-  __ testb(FieldOperand(object_map, Map::kBitFieldOffset),
-           Immediate(1 << Map::kIsAccessCheckNeeded));
-  __ j(not_zero, &fast_runtime_fallback, Label::kNear);
-  __ CmpInstanceType(object_map, JS_PROXY_TYPE);
-  __ j(equal, &fast_runtime_fallback, Label::kNear);
-
-  __ movp(object, FieldOperand(object_map, Map::kPrototypeOffset));
-  __ cmpp(object, function_prototype);
-  __ j(equal, &done, Label::kNear);
-  __ CompareRoot(object, Heap::kNullValueRootIndex);
-  __ movp(object_map, FieldOperand(object, HeapObject::kMapOffset));
-  __ j(not_equal, &loop);
-  __ LoadRoot(rax, Heap::kFalseValueRootIndex);
-  __ bind(&done);
-  __ StoreRoot(rax, Heap::kInstanceofCacheAnswerRootIndex);
-  __ ret(0);
-
-  // Found Proxy or access check needed: Call the runtime.
-  __ bind(&fast_runtime_fallback);
-  __ PopReturnAddressTo(kScratchRegister);
-  __ Push(object);
-  __ Push(function_prototype);
-  __ PushReturnAddressFrom(kScratchRegister);
-  // Invalidate the instanceof cache.
-  __ Move(rax, Smi::FromInt(0));
-  __ StoreRoot(rax, Heap::kInstanceofCacheFunctionRootIndex);
-  __ TailCallRuntime(Runtime::kHasInPrototypeChain);
-
-  // Slow-case: Call the %InstanceOf runtime function.
-  __ bind(&slow_case);
-  __ PopReturnAddressTo(kScratchRegister);
-  __ Push(object);
-  __ Push(function);
-  __ PushReturnAddressFrom(kScratchRegister);
-  __ TailCallRuntime(is_es6_instanceof() ? Runtime::kOrdinaryHasInstance
-                                         : Runtime::kInstanceOf);
-}
-
-
 // -------------------------------------------------------------------------
 // StringCharCodeAtGenerator
 
 void StringCharCodeAtGenerator::GenerateFast(MacroAssembler* masm) {
   // If the receiver is a smi trigger the non-string case.
   if (check_mode_ == RECEIVER_IS_UNKNOWN) {
     __ JumpIfSmi(object_, receiver_not_string_);
 
     // Fetch the instance type of the receiver into result register.
     __ movp(result_, FieldOperand(object_, HeapObject::kMapOffset));
@@ skipping 3436 matching lines @@
                            kStackUnwindSpace, nullptr, return_value_operand,
                            NULL);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64