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_H_ 18 #define ART_RUNTIME_UTILS_DEX_CACHE_ARRAYS_LAYOUT_H_ 19 20 #include "dex_file.h" 21 22 namespace art { 23 24 /** 25 * @class DexCacheArraysLayout 26 * @details This class provides the layout information for the type, method, field and 27 * string arrays for a DexCache with a fixed arrays' layout (such as in the boot image), 28 */ 29 class DexCacheArraysLayout { 30 public: 31 // Construct an invalid layout. 32 DexCacheArraysLayout() 33 : /* types_offset_ is always 0u */ 34 pointer_size_(0u), 35 methods_offset_(0u), 36 strings_offset_(0u), 37 fields_offset_(0u), 38 size_(0u) { 39 } 40 41 // Construct a layout for a particular dex file header. 42 DexCacheArraysLayout(size_t pointer_size, const DexFile::Header& header); 43 44 // Construct a layout for a particular dex file. 45 DexCacheArraysLayout(size_t pointer_size, const DexFile* dex_file); 46 47 bool Valid() const { 48 return Size() != 0u; 49 } 50 51 size_t Size() const { 52 return size_; 53 } 54 55 size_t Alignment() const; 56 57 size_t TypesOffset() const { 58 return types_offset_; 59 } 60 61 size_t TypeOffset(uint32_t type_idx) const; 62 63 size_t TypesSize(size_t num_elements) const; 64 65 size_t TypesAlignment() const; 66 67 size_t MethodsOffset() const { 68 return methods_offset_; 69 } 70 71 size_t MethodOffset(uint32_t method_idx) const; 72 73 size_t MethodsSize(size_t num_elements) const; 74 75 size_t MethodsAlignment() const; 76 77 size_t StringsOffset() const { 78 return strings_offset_; 79 } 80 81 size_t StringOffset(uint32_t string_idx) const; 82 83 size_t StringsSize(size_t num_elements) const; 84 85 size_t StringsAlignment() const; 86 87 size_t FieldsOffset() const { 88 return fields_offset_; 89 } 90 91 size_t FieldOffset(uint32_t field_idx) const; 92 93 size_t FieldsSize(size_t num_elements) const; 94 95 size_t FieldsAlignment() const; 96 97 private: 98 static constexpr size_t types_offset_ = 0u; 99 const size_t pointer_size_; // Must be first for construction initialization order. 100 const size_t methods_offset_; 101 const size_t strings_offset_; 102 const size_t fields_offset_; 103 const size_t size_; 104 105 static size_t Alignment(size_t pointer_size); 106 107 static size_t ElementOffset(size_t element_size, uint32_t idx); 108 109 static size_t ArraySize(size_t element_size, uint32_t num_elements); 110 }; 111 112 } // namespace art 113 114 #endif // ART_RUNTIME_UTILS_DEX_CACHE_ARRAYS_LAYOUT_H_ 115
