1 // Copyright 2014 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef V8_FIELD_INDEX_INL_H_
6 #define V8_FIELD_INDEX_INL_H_
7
8 #include "src/field-index.h"
9
10 namespace v8 {
11 namespace internal {
12
13
ForInObjectOffset(int offset,Map * map)14 inline FieldIndex FieldIndex::ForInObjectOffset(int offset, Map* map) {
15 ASSERT((offset % kPointerSize) == 0);
16 int index = offset / kPointerSize;
17 if (map == NULL) {
18 return FieldIndex(true, index, false, index + 1, 0, true);
19 }
20 int first_inobject_offset = map->GetInObjectPropertyOffset(0);
21 if (offset < first_inobject_offset) {
22 return FieldIndex(true, index, false, 0, 0, true);
23 } else {
24 return FieldIndex::ForPropertyIndex(map, offset / kPointerSize);
25 }
26 }
27
28
ForPropertyIndex(Map * map,int property_index,bool is_double)29 inline FieldIndex FieldIndex::ForPropertyIndex(Map* map,
30 int property_index,
31 bool is_double) {
32 ASSERT(map->instance_type() >= FIRST_NONSTRING_TYPE);
33 int inobject_properties = map->inobject_properties();
34 bool is_inobject = property_index < inobject_properties;
35 int first_inobject_offset;
36 if (is_inobject) {
37 first_inobject_offset = map->GetInObjectPropertyOffset(0);
38 } else {
39 first_inobject_offset = FixedArray::kHeaderSize;
40 property_index -= inobject_properties;
41 }
42 return FieldIndex(is_inobject,
43 property_index + first_inobject_offset / kPointerSize,
44 is_double, inobject_properties, first_inobject_offset);
45 }
46
47
ForLoadByFieldIndex(Map * map,int orig_index)48 inline FieldIndex FieldIndex::ForLoadByFieldIndex(Map* map, int orig_index) {
49 int field_index = orig_index;
50 int is_inobject = true;
51 bool is_double = field_index & 1;
52 int first_inobject_offset = 0;
53 field_index >>= 1;
54 if (field_index < 0) {
55 field_index = -(field_index + 1);
56 is_inobject = false;
57 first_inobject_offset = FixedArray::kHeaderSize;
58 field_index += FixedArray::kHeaderSize / kPointerSize;
59 } else {
60 first_inobject_offset = map->GetInObjectPropertyOffset(0);
61 field_index += JSObject::kHeaderSize / kPointerSize;
62 }
63 return FieldIndex(is_inobject, field_index, is_double,
64 map->inobject_properties(), first_inobject_offset);
65 }
66
67
ForDescriptor(Map * map,int descriptor_index)68 inline FieldIndex FieldIndex::ForDescriptor(Map* map, int descriptor_index) {
69 PropertyDetails details =
70 map->instance_descriptors()->GetDetails(descriptor_index);
71 int field_index =
72 map->instance_descriptors()->GetFieldIndex(descriptor_index);
73 return ForPropertyIndex(map, field_index,
74 details.representation().IsDouble());
75 }
76
77
ForKeyedLookupCacheIndex(Map * map,int index)78 inline FieldIndex FieldIndex::ForKeyedLookupCacheIndex(Map* map, int index) {
79 if (FLAG_compiled_keyed_generic_loads) {
80 return ForLoadByFieldIndex(map, index);
81 } else {
82 return ForPropertyIndex(map, index);
83 }
84 }
85
86
GetKeyedLookupCacheIndex()87 inline int FieldIndex::GetKeyedLookupCacheIndex() const {
88 if (FLAG_compiled_keyed_generic_loads) {
89 return GetLoadByFieldIndex();
90 } else {
91 return property_index();
92 }
93 }
94
95
96 } } // namespace v8::internal
97
98 #endif
99