[builtins] Move builtins into own files

src/builtins/builtins-symbol.cc

+// Copyright 2016 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.h"
+#include "src/builtins/builtins-utils.h"
+
+namespace v8 {
+namespace internal {
+
+// -----------------------------------------------------------------------------
+// ES6 section 19.4 Symbol Objects
+
+// ES6 section 19.4.1.1 Symbol ( [ description ] ) for the [[Call]] case.
+BUILTIN(SymbolConstructor) {
+  HandleScope scope(isolate);
+  Handle<Symbol> result = isolate->factory()->NewSymbol();
+  Handle<Object> description = args.atOrUndefined(isolate, 1);
+  if (!description->IsUndefined(isolate)) {
+    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, description,
+                                       Object::ToString(isolate, description));
+    result->set_name(*description);
+  }
+  return *result;
+}
+
+// ES6 section 19.4.1.1 Symbol ( [ description ] ) for the [[Construct]] case.
+BUILTIN(SymbolConstructor_ConstructStub) {
+  HandleScope scope(isolate);
+  THROW_NEW_ERROR_RETURN_FAILURE(
+      isolate, NewTypeError(MessageTemplate::kNotConstructor,
+                            isolate->factory()->Symbol_string()));
+}
+
+// ES6 section 19.4.3.4 Symbol.prototype [ @@toPrimitive ] ( hint )
+void Builtins::Generate_SymbolPrototypeToPrimitive(
+    CodeStubAssembler* assembler) {
+  typedef compiler::Node Node;
+
+  Node* receiver = assembler->Parameter(0);
+  Node* context = assembler->Parameter(4);
+
+  Node* result =
+      assembler->ToThisValue(context, receiver, PrimitiveType::kSymbol,
+                             "Symbol.prototype [ @@toPrimitive ]");
+  assembler->Return(result);
+}
+
+// ES6 section 19.4.3.2 Symbol.prototype.toString ( )
+void Builtins::Generate_SymbolPrototypeToString(CodeStubAssembler* assembler) {
+  typedef compiler::Node Node;
+
+  Node* receiver = assembler->Parameter(0);
+  Node* context = assembler->Parameter(3);
+
+  Node* value = assembler->ToThisValue(
+      context, receiver, PrimitiveType::kSymbol, "Symbol.prototype.toString");
+  Node* result =
+      assembler->CallRuntime(Runtime::kSymbolDescriptiveString, context, value);
+  assembler->Return(result);
+}
+
+// ES6 section 19.4.3.3 Symbol.prototype.valueOf ( )
+void Builtins::Generate_SymbolPrototypeValueOf(CodeStubAssembler* assembler) {
+  typedef compiler::Node Node;
+
+  Node* receiver = assembler->Parameter(0);
+  Node* context = assembler->Parameter(3);
+
+  Node* result = assembler->ToThisValue(
+      context, receiver, PrimitiveType::kSymbol, "Symbol.prototype.valueOf");
+  assembler->Return(result);
+}
+
+}  // namespace internal
+}  // namespace v8