1 /*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #ifndef ART_RUNTIME_UTILS_DEX_CACHE_ARRAYS_LAYOUT_INL_H_
18 #define ART_RUNTIME_UTILS_DEX_CACHE_ARRAYS_LAYOUT_INL_H_
19
20 #include "dex_cache_arrays_layout.h"
21
22 #include "base/bit_utils.h"
23 #include "base/logging.h"
24 #include "gc_root.h"
25 #include "globals.h"
26 #include "primitive.h"
27
28 namespace art {
29
DexCacheArraysLayout(size_t pointer_size,const DexFile::Header & header)30 inline DexCacheArraysLayout::DexCacheArraysLayout(size_t pointer_size,
31 const DexFile::Header& header)
32 : pointer_size_(pointer_size),
33 /* types_offset_ is always 0u, so it's constexpr */
34 methods_offset_(
35 RoundUp(types_offset_ + TypesSize(header.type_ids_size_), MethodsAlignment())),
36 strings_offset_(
37 RoundUp(methods_offset_ + MethodsSize(header.method_ids_size_), StringsAlignment())),
38 fields_offset_(
39 RoundUp(strings_offset_ + StringsSize(header.string_ids_size_), FieldsAlignment())),
40 size_(
41 RoundUp(fields_offset_ + FieldsSize(header.field_ids_size_), Alignment())) {
42 DCHECK(ValidPointerSize(pointer_size)) << pointer_size;
43 }
44
DexCacheArraysLayout(size_t pointer_size,const DexFile * dex_file)45 inline DexCacheArraysLayout::DexCacheArraysLayout(size_t pointer_size, const DexFile* dex_file)
46 : DexCacheArraysLayout(pointer_size, dex_file->GetHeader()) {
47 }
48
Alignment()49 inline size_t DexCacheArraysLayout::Alignment() const {
50 // GcRoot<> alignment is 4, i.e. lower than or equal to the pointer alignment.
51 static_assert(alignof(GcRoot<mirror::Class>) == 4, "Expecting alignof(GcRoot<>) == 4");
52 static_assert(alignof(GcRoot<mirror::String>) == 4, "Expecting alignof(GcRoot<>) == 4");
53 DCHECK(pointer_size_ == 4u || pointer_size_ == 8u);
54 // Pointer alignment is the same as pointer size.
55 return pointer_size_;
56 }
57
TypeOffset(uint32_t type_idx)58 inline size_t DexCacheArraysLayout::TypeOffset(uint32_t type_idx) const {
59 return types_offset_ + ElementOffset(sizeof(GcRoot<mirror::Class>), type_idx);
60 }
61
TypesSize(size_t num_elements)62 inline size_t DexCacheArraysLayout::TypesSize(size_t num_elements) const {
63 // App image patching relies on having enough room for a forwarding pointer in the types array.
64 // See FixupArtMethodArrayVisitor and ClassLinker::AddImageSpace.
65 return std::max(ArraySize(sizeof(GcRoot<mirror::Class>), num_elements), pointer_size_);
66 }
67
TypesAlignment()68 inline size_t DexCacheArraysLayout::TypesAlignment() const {
69 return alignof(GcRoot<mirror::Class>);
70 }
71
MethodOffset(uint32_t method_idx)72 inline size_t DexCacheArraysLayout::MethodOffset(uint32_t method_idx) const {
73 return methods_offset_ + ElementOffset(pointer_size_, method_idx);
74 }
75
MethodsSize(size_t num_elements)76 inline size_t DexCacheArraysLayout::MethodsSize(size_t num_elements) const {
77 // App image patching relies on having enough room for a forwarding pointer in the methods array.
78 return std::max(ArraySize(pointer_size_, num_elements), pointer_size_);
79 }
80
MethodsAlignment()81 inline size_t DexCacheArraysLayout::MethodsAlignment() const {
82 return pointer_size_;
83 }
84
StringOffset(uint32_t string_idx)85 inline size_t DexCacheArraysLayout::StringOffset(uint32_t string_idx) const {
86 return strings_offset_ + ElementOffset(sizeof(GcRoot<mirror::String>), string_idx);
87 }
88
StringsSize(size_t num_elements)89 inline size_t DexCacheArraysLayout::StringsSize(size_t num_elements) const {
90 return ArraySize(sizeof(GcRoot<mirror::String>), num_elements);
91 }
92
StringsAlignment()93 inline size_t DexCacheArraysLayout::StringsAlignment() const {
94 return alignof(GcRoot<mirror::String>);
95 }
96
FieldOffset(uint32_t field_idx)97 inline size_t DexCacheArraysLayout::FieldOffset(uint32_t field_idx) const {
98 return fields_offset_ + ElementOffset(pointer_size_, field_idx);
99 }
100
FieldsSize(size_t num_elements)101 inline size_t DexCacheArraysLayout::FieldsSize(size_t num_elements) const {
102 return ArraySize(pointer_size_, num_elements);
103 }
104
FieldsAlignment()105 inline size_t DexCacheArraysLayout::FieldsAlignment() const {
106 return pointer_size_;
107 }
108
ElementOffset(size_t element_size,uint32_t idx)109 inline size_t DexCacheArraysLayout::ElementOffset(size_t element_size, uint32_t idx) {
110 return element_size * idx;
111 }
112
ArraySize(size_t element_size,uint32_t num_elements)113 inline size_t DexCacheArraysLayout::ArraySize(size_t element_size, uint32_t num_elements) {
114 return element_size * num_elements;
115 }
116
117 } // namespace art
118
119 #endif // ART_RUNTIME_UTILS_DEX_CACHE_ARRAYS_LAYOUT_INL_H_
120