[refactor] Separate generated builtins and C++ builtins into separate files

src/builtins/builtins-function-gen.cc

+// Copyright 2017 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.
+
+#include "src/builtins/builtins-utils-gen.h"
+#include "src/builtins/builtins.h"
+#include "src/code-stub-assembler.h"
+
+namespace v8 {
+namespace internal {
+
+TF_BUILTIN(FastFunctionPrototypeBind, CodeStubAssembler) {
+  Label slow(this);
+
+  Node* argc = Parameter(BuiltinDescriptor::kArgumentsCount);
+  Node* context = Parameter(BuiltinDescriptor::kContext);
+  Node* new_target = Parameter(BuiltinDescriptor::kNewTarget);
+
+  CodeStubArguments args(this, ChangeInt32ToIntPtr(argc));
+
+  // Check that receiver has instance type of JS_FUNCTION_TYPE
+  Node* receiver = args.GetReceiver();
+  GotoIf(TaggedIsSmi(receiver), &slow);
+
+  Node* receiver_map = LoadMap(receiver);
+  Node* instance_type = LoadMapInstanceType(receiver_map);
+  GotoIf(Word32NotEqual(instance_type, Int32Constant(JS_FUNCTION_TYPE)), &slow);
+
+  // Disallow binding of slow-mode functions. We need to figure out whether the
+  // length and name property are in the original state.
+  Comment("Disallow binding of slow-mode functions");
+  GotoIf(IsDictionaryMap(receiver_map), &slow);
+
+  // Check whether the length and name properties are still present as
+  // AccessorInfo objects. In that case, their value can be recomputed even if
+  // the actual value on the object changes.
+  Comment("Check descriptor array length");
+  Node* descriptors = LoadMapDescriptors(receiver_map);
+  Node* descriptors_length = LoadFixedArrayBaseLength(descriptors);
+  GotoIf(SmiLessThanOrEqual(descriptors_length, SmiConstant(1)), &slow);
+
+  // Check whether the length and name properties are still present as
+  // AccessorInfo objects. In that case, their value can be recomputed even if
+  // the actual value on the object changes.
+  Comment("Check name and length properties");
+  const int length_index = JSFunction::kLengthDescriptorIndex;
+  Node* maybe_length = LoadFixedArrayElement(
+      descriptors, DescriptorArray::ToKeyIndex(length_index));
+  GotoIf(WordNotEqual(maybe_length, LoadRoot(Heap::klength_stringRootIndex)),
+         &slow);
+
+  Node* maybe_length_accessor = LoadFixedArrayElement(
+      descriptors, DescriptorArray::ToValueIndex(length_index));
+  GotoIf(TaggedIsSmi(maybe_length_accessor), &slow);
+  Node* length_value_map = LoadMap(maybe_length_accessor);
+  GotoIfNot(IsAccessorInfoMap(length_value_map), &slow);
+
+  const int name_index = JSFunction::kNameDescriptorIndex;
+  Node* maybe_name = LoadFixedArrayElement(
+      descriptors, DescriptorArray::ToKeyIndex(name_index));
+  GotoIf(WordNotEqual(maybe_name, LoadRoot(Heap::kname_stringRootIndex)),
+         &slow);
+
+  Node* maybe_name_accessor = LoadFixedArrayElement(
+      descriptors, DescriptorArray::ToValueIndex(name_index));
+  GotoIf(TaggedIsSmi(maybe_name_accessor), &slow);
+  Node* name_value_map = LoadMap(maybe_name_accessor);
+  GotoIfNot(IsAccessorInfoMap(name_value_map), &slow);
+
+  // Choose the right bound function map based on whether the target is
+  // constructable.
+  Comment("Choose the right bound function map");
+  Variable bound_function_map(this, MachineRepresentation::kTagged);
+  Label with_constructor(this);
+  VariableList vars({&bound_function_map}, zone());
+  Node* native_context = LoadNativeContext(context);
+
+  Label map_done(this, vars);
+  Node* bit_field = LoadMapBitField(receiver_map);
+  int mask = static_cast<int>(1 << Map::kIsConstructor);
+  GotoIf(IsSetWord32(bit_field, mask), &with_constructor);
+
+  bound_function_map.Bind(LoadContextElement(
+      native_context, Context::BOUND_FUNCTION_WITHOUT_CONSTRUCTOR_MAP_INDEX));
+  Goto(&map_done);
+
+  Bind(&with_constructor);
+  bound_function_map.Bind(LoadContextElement(
+      native_context, Context::BOUND_FUNCTION_WITH_CONSTRUCTOR_MAP_INDEX));
+  Goto(&map_done);
+
+  Bind(&map_done);
+
+  // Verify that __proto__ matches that of a the target bound function.
+  Comment("Verify that __proto__ matches target bound function");
+  Node* prototype = LoadMapPrototype(receiver_map);
+  Node* expected_prototype = LoadMapPrototype(bound_function_map.value());
+  GotoIf(WordNotEqual(prototype, expected_prototype), &slow);
+
+  // Allocate the arguments array.
+  Comment("Allocate the arguments array");
+  Variable argument_array(this, MachineRepresentation::kTagged);
+  Label empty_arguments(this);
+  Label arguments_done(this, &argument_array);
+  GotoIf(Uint32LessThanOrEqual(argc, Int32Constant(1)), &empty_arguments);
+  Node* elements_length = ChangeUint32ToWord(Int32Sub(argc, Int32Constant(1)));
+  Node* elements = AllocateFixedArray(FAST_ELEMENTS, elements_length);
+  Variable index(this, MachineType::PointerRepresentation());
+  index.Bind(IntPtrConstant(0));
+  VariableList foreach_vars({&index}, zone());
+  args.ForEach(foreach_vars,
+               [this, elements, &index](Node* arg) {
+                 StoreFixedArrayElement(elements, index.value(), arg);
+                 Increment(index);
+               },
+               IntPtrConstant(1));
+  argument_array.Bind(elements);
+  Goto(&arguments_done);
+
+  Bind(&empty_arguments);
+  argument_array.Bind(EmptyFixedArrayConstant());
+  Goto(&arguments_done);
+
+  Bind(&arguments_done);
+
+  // Determine bound receiver.
+  Comment("Determine bound receiver");
+  Variable bound_receiver(this, MachineRepresentation::kTagged);
+  Label has_receiver(this);
+  Label receiver_done(this, &bound_receiver);
+  GotoIf(Word32NotEqual(argc, Int32Constant(0)), &has_receiver);
+  bound_receiver.Bind(UndefinedConstant());
+  Goto(&receiver_done);
+
+  Bind(&has_receiver);
+  bound_receiver.Bind(args.AtIndex(0));
+  Goto(&receiver_done);
+
+  Bind(&receiver_done);
+
+  // Allocate the resulting bound function.
+  Comment("Allocate the resulting bound function");
+  Node* bound_function = Allocate(JSBoundFunction::kSize);
+  StoreMapNoWriteBarrier(bound_function, bound_function_map.value());
+  StoreObjectFieldNoWriteBarrier(
+      bound_function, JSBoundFunction::kBoundTargetFunctionOffset, receiver);
+  StoreObjectFieldNoWriteBarrier(bound_function,
+                                 JSBoundFunction::kBoundThisOffset,
+                                 bound_receiver.value());
+  StoreObjectFieldNoWriteBarrier(bound_function,
+                                 JSBoundFunction::kBoundArgumentsOffset,
+                                 argument_array.value());
+  Node* empty_fixed_array = EmptyFixedArrayConstant();
+  StoreObjectFieldNoWriteBarrier(bound_function, JSObject::kPropertiesOffset,
+                                 empty_fixed_array);
+  StoreObjectFieldNoWriteBarrier(bound_function, JSObject::kElementsOffset,
+                                 empty_fixed_array);
+
+  args.PopAndReturn(bound_function);
+  Bind(&slow);
+
+  Node* target = LoadFromFrame(StandardFrameConstants::kFunctionOffset,
+                               MachineType::TaggedPointer());
+  TailCallStub(CodeFactory::FunctionPrototypeBind(isolate()), context, target,
+               new_target, argc);
+}
+
+// ES6 section 19.2.3.6 Function.prototype [ @@hasInstance ] ( V )
+TF_BUILTIN(FunctionPrototypeHasInstance, CodeStubAssembler) {
+  Node* f = Parameter(0);
+  Node* v = Parameter(1);
+  Node* context = Parameter(4);
+  Node* result = OrdinaryHasInstance(context, f, v);
+  Return(result);
+}
+
+}  // namespace internal
+}  // namespace v8