PPC/S390: [es6] Reintroduce the instanceof operator in the backends.

src/s390/code-stubs-s390.cc

Index: src/s390/code-stubs-s390.cc
diff --git a/src/s390/code-stubs-s390.cc b/src/s390/code-stubs-s390.cc
index ac0d7cad10658ef747b6cba6f45fc2b3e8d18c6e..e1e200376c17ef2700639a0e48d0ffe052571679 100644
--- a/src/s390/code-stubs-s390.cc
+++ b/src/s390/code-stubs-s390.cc
@@ -1367,125 +1367,6 @@ void JSEntryStub::Generate(MacroAssembler* masm) {
   __ b(r14);
 }
 
-void InstanceOfStub::Generate(MacroAssembler* masm) {
-  Register const object = r3;              // Object (lhs).
-  Register const function = r2;            // Function (rhs).
-  Register const object_map = r4;          // Map of {object}.
-  Register const function_map = r5;        // Map of {function}.
-  Register const function_prototype = r6;  // Prototype of {function}.
-  Register const scratch = r7;
-
-  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;
-  __ LoadP(object_map, FieldMemOperand(object, HeapObject::kMapOffset));
-  __ CompareRoot(function, Heap::kInstanceofCacheFunctionRootIndex);
-  __ bne(&fast_case);
-  __ CompareRoot(object_map, Heap::kInstanceofCacheMapRootIndex);
-  __ bne(&fast_case);
-  __ LoadRoot(r2, 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);
-  __ bne(&slow_case);
-  __ LoadRoot(r2, 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);
-  __ bne(&slow_case);
-
-  // Go to the runtime if the function is not a constructor.
-  __ LoadlB(scratch, FieldMemOperand(function_map, Map::kBitFieldOffset));
-  __ TestBit(scratch, Map::kIsConstructor, r0);
-  __ beq(&slow_case);
-
-  // Ensure that {function} has an instance prototype.
-  __ TestBit(scratch, Map::kHasNonInstancePrototype, r0);
-  __ bne(&slow_case);
-
-  // Get the "prototype" (or initial map) of the {function}.
-  __ LoadP(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);
-  __ bne(&function_prototype_valid);
-  __ LoadP(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 = r2;
-
-  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.
-  __ LoadlB(map_bit_field, FieldMemOperand(object_map, Map::kBitFieldOffset));
-  __ TestBit(map_bit_field, Map::kIsAccessCheckNeeded, r0);
-  __ bne(&fast_runtime_fallback);
-  // Check if the current object is a Proxy.
-  __ CompareInstanceType(object_map, object_instance_type, JS_PROXY_TYPE);
-  __ beq(&fast_runtime_fallback);
-
-  __ LoadP(object, FieldMemOperand(object_map, Map::kPrototypeOffset));
-  __ CmpP(object, function_prototype);
-  __ beq(&done);
-  __ CmpP(object, null);
-  __ LoadP(object_map, FieldMemOperand(object, HeapObject::kMapOffset));
-  __ bne(&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.
-  __ LoadSmiLiteral(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();