Revert 21720: "Introduce FieldIndex to unify and abstract property/field offset"

src/field-index-inl.h

-// Copyright 2014 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_FIELD_INDEX_INL_H_
-#define V8_FIELD_INDEX_INL_H_
-
-#include "src/field-index.h"
-
-namespace v8 {
-namespace internal {
-
-
-inline FieldIndex FieldIndex::ForInObjectOffset(int offset, Map* map) {
-  ASSERT((offset % kPointerSize) == 0);
-  int index = offset / kPointerSize;
-  if (map == NULL) {
-    return FieldIndex(true, index, false, index + 1, 0, true);
-  }
-  int first_inobject_offset = map->GetInObjectPropertyOffset(0);
-  if (offset < first_inobject_offset) {
-    return FieldIndex(true, index, false, 0, 0, true);
-  } else {
-    return FieldIndex::ForPropertyIndex(map, offset / kPointerSize);
-  }
-}
-
-
-inline FieldIndex FieldIndex::ForPropertyIndex(Map* map,
-                                               int property_index,
-                                               bool is_double) {
-  ASSERT(map->instance_type() >= FIRST_NONSTRING_TYPE);
-  int inobject_properties = map->inobject_properties();
-  bool is_inobject = property_index < inobject_properties;
-  int first_inobject_offset;
-  if (is_inobject) {
-    first_inobject_offset = map->GetInObjectPropertyOffset(0);
-  } else {
-    first_inobject_offset = FixedArray::kHeaderSize;
-    property_index -= inobject_properties;
-  }
-  return FieldIndex(is_inobject,
-                    property_index + first_inobject_offset / kPointerSize,
-                    is_double, inobject_properties, first_inobject_offset);
-}
-
-
-inline FieldIndex FieldIndex::ForLoadByFieldIndex(Map* map, int orig_index) {
-  int field_index = orig_index;
-  int is_inobject = true;
-  bool is_double = field_index & 1;
-  int first_inobject_offset = 0;
-  field_index >>= 1;
-  if (field_index < 0) {
-    field_index = -(field_index + 1);
-    is_inobject = false;
-    first_inobject_offset = FixedArray::kHeaderSize;
-    field_index += FixedArray::kHeaderSize / kPointerSize;
-  } else {
-    first_inobject_offset = map->GetInObjectPropertyOffset(0);
-    field_index += JSObject::kHeaderSize / kPointerSize;
-  }
-  return FieldIndex(is_inobject, field_index, is_double,
-                    map->inobject_properties(), first_inobject_offset);
-}
-
-
-inline FieldIndex FieldIndex::ForDescriptor(Map* map, int descriptor_index) {
-  PropertyDetails details =
-      map->instance_descriptors()->GetDetails(descriptor_index);
-  int field_index =
-      map->instance_descriptors()->GetFieldIndex(descriptor_index);
-  return ForPropertyIndex(map, field_index,
-                          details.representation().IsDouble());
-}
-
-
-} }  // namespace v8::internal
-
-#endif