Amend DataView, ArrayBuffer, and TypedArray methods to use ToIndex.

src/objects.cc

 // Copyright 2015 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/objects.h"
 
 #include <cmath>
 #include <iomanip>
 #include <sstream>
 
@@ skipping 210 matching lines @@
   ASSIGN_RETURN_ON_EXCEPTION(isolate, input, ToNumber(input), Object);
   double len = DoubleToInteger(input->Number());
   if (len <= 0.0) {
     len = 0.0;
   } else if (len >= kMaxSafeInteger) {
     len = kMaxSafeInteger;
   }
   return isolate->factory()->NewNumber(len);
 }
 
+// static
+MaybeHandle<Object> Object::ToIndex(Isolate* isolate, Handle<Object> input) {
+  if (input->IsUndefined(isolate)) return isolate->factory()->NewNumber(0.0);
+  ASSIGN_RETURN_ON_EXCEPTION(isolate, input, ToNumber(input), Object);
+  double len = DoubleToInteger(input->Number()) + 0.0;
+  if (len < 0.0 || len > kMaxSafeInteger) {
+    THROW_NEW_ERROR(isolate, NewRangeError(MessageTemplate::kInvalidIndex),
+                    Object);
+  }
+  return isolate->factory()->NewNumber(len);
+}
 
 bool Object::BooleanValue() {
   if (IsSmi()) return Smi::cast(this)->value() != 0;
   DCHECK(IsHeapObject());
   Isolate* isolate = HeapObject::cast(this)->GetIsolate();
   if (IsBoolean()) return IsTrue(isolate);
   if (IsUndefined(isolate) || IsNull(isolate)) return false;
   if (IsUndetectable()) return false;  // Undetectable object is false.
   if (IsString()) return String::cast(this)->length() != 0;
   if (IsHeapNumber()) return HeapNumber::cast(this)->HeapNumberBooleanValue();
@@ skipping 18617 matching lines @@
   } else {
     // Old-style generators.
     int offset = continuation();
     CHECK(0 <= offset && offset < function()->code()->instruction_size());
     return function()->code()->SourcePosition(offset);
   }
 }
 
 }  // namespace internal
 }  // namespace v8