[builtins] Move StringIncludes to a builtin.

src/builtins/builtins-string.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"
 
 #include "src/code-factory.h"
 
 namespace v8 {
@@ skipping 763 matching lines @@
 
     assembler->Bind(&if_positioninbounds);
   }
 
   // Load the character at the {position} from the {receiver}.
   Node* value = assembler->StringCharCodeAt(receiver, position);
   Node* result = assembler->SmiFromWord32(value);
   assembler->Return(result);
 }
 
+// ES6 section 21.1.3.7
+// String.prototype.includes ( searchString [ , position ] )
+BUILTIN(StringPrototypeIncludes) {
+  HandleScope handle_scope(isolate);
+  TO_THIS_STRING(str, "String.prototype.includes");
+
+  // Check if the search string is a regExp and fail if it is.
+  Handle<Object> search = args.atOrUndefined(isolate, 1);
+  Maybe<bool> is_reg_exp = Object::IsRegExp(isolate, search);
+  if (is_reg_exp.IsNothing()) {
+    DCHECK(isolate->has_pending_exception());
+    return isolate->heap()->exception();
+  }
+  if (is_reg_exp.FromJust()) {
+    THROW_NEW_ERROR_RETURN_FAILURE(
+        isolate, NewTypeError(MessageTemplate::kFirstArgumentNotRegExp,
+                              isolate->factory()->NewStringFromStaticChars(
+                                  "String.prototype.includes")));
+  }
+  Handle<String> search_string;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, search_string,
+                                     Object::ToString(isolate, search));
+  Handle<Object> position;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+      isolate, position,
+      Object::ToInteger(isolate, args.atOrUndefined(isolate, 2)));
+
+  double index = std::max(position->Number(), 0.0);
+  index = std::min(index, static_cast<double>(str->length()));
+
+  int index_in_str = String::IndexOf(isolate, str, search_string,
+                                     static_cast<uint32_t>(index));
+  return *isolate->factory()->ToBoolean(index_in_str != -1);
+}
+
 // ES6 section 21.1.3.8 String.prototype.indexOf ( searchString [ , position ] )
 BUILTIN(StringPrototypeIndexOf) {
   HandleScope handle_scope(isolate);
 
   return String::IndexOf(isolate, args.receiver(),
                          args.atOrUndefined(isolate, 1),
                          args.atOrUndefined(isolate, 2));
 }
 
 // ES6 section 21.1.3.9
@@ skipping 556 matching lines @@
         Runtime::kThrowIncompatibleMethodReceiver, context,
         assembler->HeapConstant(assembler->factory()->NewStringFromAsciiChecked(
             "String Iterator.prototype.next", TENURED)),
         iterator);
     assembler->Return(result);  // Never reached.
   }
 }
 
 }  // namespace internal
 }  // namespace v8