[builtins] move array builtins into its own file.

src/builtins/builtins-utils.h

Index: src/builtins/builtins-utils.h
diff --git a/src/builtins/builtins-utils.h b/src/builtins/builtins-utils.h
new file mode 100644
index 0000000000000000000000000000000000000000..c2caa136e1725a73f00251889377fcf4b0718637
--- /dev/null
+++ b/src/builtins/builtins-utils.h
@@ -0,0 +1,135 @@
+// 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.
+
+#ifndef V8_BUILTINS_BUILTINS_UTILS_H_
+#define V8_BUILTINS_BUILTINS_UTILS_H_
+
+#include "src/arguments.h"
+#include "src/base/logging.h"
+#include "src/builtins/builtins.h"
+#include "src/code-stub-assembler.h"
+
+namespace v8 {
+namespace internal {
+
+// Arguments object passed to C++ builtins.
+class BuiltinArguments : public Arguments {
+ public:
+  BuiltinArguments(int length, Object** arguments)
+      : Arguments(length, arguments) {
+    // Check we have at least the receiver.
+    DCHECK_LE(1, this->length());
+  }
+
+  Object*& operator[](int index) {
+    DCHECK_LT(index, length());
+    return Arguments::operator[](index);
+  }
+
+  template <class S>
+  Handle<S> at(int index) {
+    DCHECK_LT(index, length());
+    return Arguments::at<S>(index);
+  }
+
+  Handle<Object> atOrUndefined(Isolate* isolate, int index) {
+    if (index >= length()) {
+      return isolate->factory()->undefined_value();
+    }
+    return at<Object>(index);
+  }
+
+  Handle<Object> receiver() { return Arguments::at<Object>(0); }
+
+  static const int kNewTargetOffset = 0;
+  static const int kTargetOffset = 1;
+  static const int kArgcOffset = 2;
+  static const int kNumExtraArgs = 3;
+  static const int kNumExtraArgsWithReceiver = 4;
+
+  template <class S>
+  Handle<S> target() {
+    return Arguments::at<S>(Arguments::length() - 1 - kTargetOffset);
+  }
+  Handle<HeapObject> new_target() {
+    return Arguments::at<HeapObject>(Arguments::length() - 1 -
+                                     kNewTargetOffset);
+  }
+
+  // Gets the total number of arguments including the receiver (but
+  // excluding extra arguments).
+  int length() const { return Arguments::length() - kNumExtraArgs; }
+};
+
+// ----------------------------------------------------------------------------
+// Support macro for defining builtins in C++.
+// ----------------------------------------------------------------------------
+//
+// A builtin function is defined by writing:
+//
+//   BUILTIN(name) {
+//     ...
+//   }
+//
+// In the body of the builtin function the arguments can be accessed
+// through the BuiltinArguments object args.
+// TODO(cbruni): add global flag to check whether any tracing events have been
+// enabled.
+#define BUILTIN(name)                                                         \
+  MUST_USE_RESULT static Object* Builtin_Impl_##name(BuiltinArguments args,   \
+                                                     Isolate* isolate);       \
+                                                                              \
+  V8_NOINLINE static Object* Builtin_Impl_Stats_##name(                       \
+      int args_length, Object** args_object, Isolate* isolate) {              \
+    BuiltinArguments args(args_length, args_object);                          \
+    RuntimeCallTimerScope timer(isolate, &RuntimeCallStats::Builtin_##name);  \
+    TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.runtime"),                     \
+                 "V8.Builtin_" #name);                                        \
+    return Builtin_Impl_##name(args, isolate);                                \
+  }                                                                           \
+                                                                              \
+  MUST_USE_RESULT Object* Builtin_##name(                                     \
+      int args_length, Object** args_object, Isolate* isolate) {              \
+    DCHECK(isolate->context() == nullptr || isolate->context()->IsContext()); \
+    if (FLAG_runtime_call_stats) {                                            \
+      return Builtin_Impl_Stats_##name(args_length, args_object, isolate);    \
+    }                                                                         \
+    BuiltinArguments args(args_length, args_object);                          \
+    return Builtin_Impl_##name(args, isolate);                                \
+  }                                                                           \
+                                                                              \
+  MUST_USE_RESULT static Object* Builtin_Impl_##name(BuiltinArguments args,   \
+                                                     Isolate* isolate)
+
+// ----------------------------------------------------------------------------
+
+#define CHECK_RECEIVER(Type, name, method)                                  \
+  if (!args.receiver()->Is##Type()) {                                       \
+    THROW_NEW_ERROR_RETURN_FAILURE(                                         \
+        isolate,                                                            \
+        NewTypeError(MessageTemplate::kIncompatibleMethodReceiver,          \
+                     isolate->factory()->NewStringFromAsciiChecked(method), \
+                     args.receiver()));                                     \
+  }                                                                         \
+  Handle<Type> name = Handle<Type>::cast(args.receiver())
+
+// Throws a TypeError for {method} if the receiver is not coercible to Object,
+// or converts the receiver to a String otherwise and assigns it to a new var
+// with the given {name}.
+#define TO_THIS_STRING(name, method)                                          \
+  if (args.receiver()->IsNull(isolate) ||                                     \
+      args.receiver()->IsUndefined(isolate)) {                                \
+    THROW_NEW_ERROR_RETURN_FAILURE(                                           \
+        isolate,                                                              \
+        NewTypeError(MessageTemplate::kCalledOnNullOrUndefined,               \
+                     isolate->factory()->NewStringFromAsciiChecked(method))); \
+  }                                                                           \
+  Handle<String> name;                                                        \
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(                                         \
+      isolate, name, Object::ToString(isolate, args.receiver()))
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_BUILTINS_BUILTINS_UTILS_H_