Ian Rogers | 96faf5b | 2013-08-09 22:05:32 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013 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_MAPPING_TABLE_H_ |
| 18 | #define ART_RUNTIME_MAPPING_TABLE_H_ |
| 19 | |
| 20 | #include "base/logging.h" |
| 21 | #include "leb128.h" |
| 22 | |
| 23 | namespace art { |
| 24 | |
| 25 | // A utility for processing the raw uleb128 encoded mapping table created by the quick compiler. |
| 26 | class MappingTable { |
| 27 | public: |
| 28 | explicit MappingTable(const uint8_t* encoded_map) : encoded_table_(encoded_map) { |
| 29 | } |
| 30 | |
| 31 | uint32_t TotalSize() const PURE { |
| 32 | const uint8_t* table = encoded_table_; |
Ian Rogers | 159aa95 | 2013-11-14 14:51:11 -0800 | [diff] [blame] | 33 | if (table == nullptr) { |
Ian Rogers | 96faf5b | 2013-08-09 22:05:32 -0700 | [diff] [blame] | 34 | return 0; |
| 35 | } else { |
| 36 | return DecodeUnsignedLeb128(&table); |
| 37 | } |
| 38 | } |
| 39 | |
| 40 | uint32_t DexToPcSize() const PURE { |
| 41 | const uint8_t* table = encoded_table_; |
Ian Rogers | 159aa95 | 2013-11-14 14:51:11 -0800 | [diff] [blame] | 42 | if (table == nullptr) { |
Ian Rogers | 96faf5b | 2013-08-09 22:05:32 -0700 | [diff] [blame] | 43 | return 0; |
| 44 | } else { |
| 45 | uint32_t total_size = DecodeUnsignedLeb128(&table); |
| 46 | uint32_t pc_to_dex_size = DecodeUnsignedLeb128(&table); |
| 47 | return total_size - pc_to_dex_size; |
| 48 | } |
| 49 | } |
| 50 | |
| 51 | const uint8_t* FirstDexToPcPtr() const { |
| 52 | const uint8_t* table = encoded_table_; |
Ian Rogers | 159aa95 | 2013-11-14 14:51:11 -0800 | [diff] [blame] | 53 | if (table != nullptr) { |
| 54 | uint32_t total_size = DecodeUnsignedLeb128(&table); |
Ian Rogers | 96faf5b | 2013-08-09 22:05:32 -0700 | [diff] [blame] | 55 | uint32_t pc_to_dex_size = DecodeUnsignedLeb128(&table); |
Ian Rogers | 159aa95 | 2013-11-14 14:51:11 -0800 | [diff] [blame] | 56 | // We must have dex to pc entries or else the loop will go beyond the end of the table. |
| 57 | DCHECK_GT(total_size, pc_to_dex_size); |
Ian Rogers | 96faf5b | 2013-08-09 22:05:32 -0700 | [diff] [blame] | 58 | for (uint32_t i = 0; i < pc_to_dex_size; ++i) { |
Vladimir Marko | 12d16ad | 2014-02-27 13:42:09 +0000 | [diff] [blame] | 59 | DecodeUnsignedLeb128(&table); // Move ptr past native PC delta. |
| 60 | DecodeSignedLeb128(&table); // Move ptr past dex PC delta. |
Ian Rogers | 96faf5b | 2013-08-09 22:05:32 -0700 | [diff] [blame] | 61 | } |
| 62 | } |
| 63 | return table; |
| 64 | } |
| 65 | |
| 66 | class DexToPcIterator { |
| 67 | public: |
| 68 | DexToPcIterator(const MappingTable* table, uint32_t element) : |
Ian Rogers | 159aa95 | 2013-11-14 14:51:11 -0800 | [diff] [blame] | 69 | table_(table), element_(element), end_(table_->DexToPcSize()), encoded_table_ptr_(nullptr), |
Ian Rogers | 96faf5b | 2013-08-09 22:05:32 -0700 | [diff] [blame] | 70 | native_pc_offset_(0), dex_pc_(0) { |
Ian Rogers | 159aa95 | 2013-11-14 14:51:11 -0800 | [diff] [blame] | 71 | if (element == 0) { // An iterator wanted from the start. |
Ian Rogers | 20ab6c8 | 2013-11-13 23:31:08 -0800 | [diff] [blame] | 72 | if (end_ > 0) { |
Ian Rogers | 159aa95 | 2013-11-14 14:51:11 -0800 | [diff] [blame] | 73 | encoded_table_ptr_ = table_->FirstDexToPcPtr(); |
Ian Rogers | 20ab6c8 | 2013-11-13 23:31:08 -0800 | [diff] [blame] | 74 | native_pc_offset_ = DecodeUnsignedLeb128(&encoded_table_ptr_); |
Vladimir Marko | 1e6cb63 | 2013-11-28 16:27:29 +0000 | [diff] [blame] | 75 | // First delta is always positive. |
| 76 | dex_pc_ = static_cast<uint32_t>(DecodeSignedLeb128(&encoded_table_ptr_)); |
Ian Rogers | 20ab6c8 | 2013-11-13 23:31:08 -0800 | [diff] [blame] | 77 | } |
Ian Rogers | 159aa95 | 2013-11-14 14:51:11 -0800 | [diff] [blame] | 78 | } else { // An iterator wanted from the end. |
Ian Rogers | 96faf5b | 2013-08-09 22:05:32 -0700 | [diff] [blame] | 79 | DCHECK_EQ(table_->DexToPcSize(), element); |
| 80 | } |
| 81 | } |
| 82 | uint32_t NativePcOffset() const { |
| 83 | return native_pc_offset_; |
| 84 | } |
| 85 | uint32_t DexPc() const { |
| 86 | return dex_pc_; |
| 87 | } |
| 88 | void operator++() { |
| 89 | ++element_; |
| 90 | if (element_ != end_) { // Avoid reading beyond the end of the table. |
Vladimir Marko | 1e6cb63 | 2013-11-28 16:27:29 +0000 | [diff] [blame] | 91 | native_pc_offset_ += DecodeUnsignedLeb128(&encoded_table_ptr_); |
| 92 | // For negative delta, unsigned overflow after static_cast does exactly what we need. |
| 93 | dex_pc_ += static_cast<uint32_t>(DecodeSignedLeb128(&encoded_table_ptr_)); |
Ian Rogers | 96faf5b | 2013-08-09 22:05:32 -0700 | [diff] [blame] | 94 | } |
| 95 | } |
| 96 | bool operator==(const DexToPcIterator& rhs) const { |
| 97 | CHECK(table_ == rhs.table_); |
| 98 | return element_ == rhs.element_; |
| 99 | } |
| 100 | bool operator!=(const DexToPcIterator& rhs) const { |
| 101 | CHECK(table_ == rhs.table_); |
| 102 | return element_ != rhs.element_; |
| 103 | } |
| 104 | |
| 105 | private: |
| 106 | const MappingTable* const table_; // The original table. |
| 107 | uint32_t element_; // A value in the range 0 to end_. |
| 108 | const uint32_t end_; // Equal to table_->DexToPcSize(). |
Ian Rogers | 159aa95 | 2013-11-14 14:51:11 -0800 | [diff] [blame] | 109 | const uint8_t* encoded_table_ptr_; // Either nullptr or points to encoded data after this entry. |
Ian Rogers | 96faf5b | 2013-08-09 22:05:32 -0700 | [diff] [blame] | 110 | uint32_t native_pc_offset_; // The current value of native pc offset. |
| 111 | uint32_t dex_pc_; // The current value of dex pc. |
| 112 | }; |
| 113 | |
| 114 | DexToPcIterator DexToPcBegin() const { |
| 115 | return DexToPcIterator(this, 0); |
| 116 | } |
| 117 | |
| 118 | DexToPcIterator DexToPcEnd() const { |
| 119 | uint32_t size = DexToPcSize(); |
| 120 | return DexToPcIterator(this, size); |
| 121 | } |
| 122 | |
| 123 | uint32_t PcToDexSize() const PURE { |
| 124 | const uint8_t* table = encoded_table_; |
Ian Rogers | 159aa95 | 2013-11-14 14:51:11 -0800 | [diff] [blame] | 125 | if (table == nullptr) { |
Ian Rogers | 96faf5b | 2013-08-09 22:05:32 -0700 | [diff] [blame] | 126 | return 0; |
| 127 | } else { |
| 128 | DecodeUnsignedLeb128(&table); // Total_size, unused. |
| 129 | uint32_t pc_to_dex_size = DecodeUnsignedLeb128(&table); |
| 130 | return pc_to_dex_size; |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | const uint8_t* FirstPcToDexPtr() const { |
| 135 | const uint8_t* table = encoded_table_; |
Ian Rogers | 159aa95 | 2013-11-14 14:51:11 -0800 | [diff] [blame] | 136 | if (table != nullptr) { |
Ian Rogers | 96faf5b | 2013-08-09 22:05:32 -0700 | [diff] [blame] | 137 | DecodeUnsignedLeb128(&table); // Total_size, unused. |
| 138 | DecodeUnsignedLeb128(&table); // PC to Dex size, unused. |
| 139 | } |
| 140 | return table; |
| 141 | } |
| 142 | |
| 143 | class PcToDexIterator { |
| 144 | public: |
| 145 | PcToDexIterator(const MappingTable* table, uint32_t element) : |
Ian Rogers | 159aa95 | 2013-11-14 14:51:11 -0800 | [diff] [blame] | 146 | table_(table), element_(element), end_(table_->PcToDexSize()), encoded_table_ptr_(nullptr), |
Ian Rogers | 96faf5b | 2013-08-09 22:05:32 -0700 | [diff] [blame] | 147 | native_pc_offset_(0), dex_pc_(0) { |
Ian Rogers | 159aa95 | 2013-11-14 14:51:11 -0800 | [diff] [blame] | 148 | if (element == 0) { // An iterator wanted from the start. |
Ian Rogers | 20ab6c8 | 2013-11-13 23:31:08 -0800 | [diff] [blame] | 149 | if (end_ > 0) { |
Ian Rogers | 159aa95 | 2013-11-14 14:51:11 -0800 | [diff] [blame] | 150 | encoded_table_ptr_ = table_->FirstPcToDexPtr(); |
Ian Rogers | 20ab6c8 | 2013-11-13 23:31:08 -0800 | [diff] [blame] | 151 | native_pc_offset_ = DecodeUnsignedLeb128(&encoded_table_ptr_); |
Vladimir Marko | 1e6cb63 | 2013-11-28 16:27:29 +0000 | [diff] [blame] | 152 | // First delta is always positive. |
| 153 | dex_pc_ = static_cast<uint32_t>(DecodeSignedLeb128(&encoded_table_ptr_)); |
Ian Rogers | 20ab6c8 | 2013-11-13 23:31:08 -0800 | [diff] [blame] | 154 | } |
Ian Rogers | 159aa95 | 2013-11-14 14:51:11 -0800 | [diff] [blame] | 155 | } else { // An iterator wanted from the end. |
Ian Rogers | 96faf5b | 2013-08-09 22:05:32 -0700 | [diff] [blame] | 156 | DCHECK_EQ(table_->PcToDexSize(), element); |
| 157 | } |
| 158 | } |
| 159 | uint32_t NativePcOffset() const { |
| 160 | return native_pc_offset_; |
| 161 | } |
| 162 | uint32_t DexPc() const { |
| 163 | return dex_pc_; |
| 164 | } |
| 165 | void operator++() { |
| 166 | ++element_; |
| 167 | if (element_ != end_) { // Avoid reading beyond the end of the table. |
Vladimir Marko | 1e6cb63 | 2013-11-28 16:27:29 +0000 | [diff] [blame] | 168 | native_pc_offset_ += DecodeUnsignedLeb128(&encoded_table_ptr_); |
| 169 | // For negative delta, unsigned overflow after static_cast does exactly what we need. |
| 170 | dex_pc_ += static_cast<uint32_t>(DecodeSignedLeb128(&encoded_table_ptr_)); |
Ian Rogers | 96faf5b | 2013-08-09 22:05:32 -0700 | [diff] [blame] | 171 | } |
| 172 | } |
| 173 | bool operator==(const PcToDexIterator& rhs) const { |
| 174 | CHECK(table_ == rhs.table_); |
| 175 | return element_ == rhs.element_; |
| 176 | } |
| 177 | bool operator!=(const PcToDexIterator& rhs) const { |
| 178 | CHECK(table_ == rhs.table_); |
| 179 | return element_ != rhs.element_; |
| 180 | } |
| 181 | |
| 182 | private: |
| 183 | const MappingTable* const table_; // The original table. |
| 184 | uint32_t element_; // A value in the range 0 to PcToDexSize. |
| 185 | const uint32_t end_; // Equal to table_->PcToDexSize(). |
Ian Rogers | 159aa95 | 2013-11-14 14:51:11 -0800 | [diff] [blame] | 186 | const uint8_t* encoded_table_ptr_; // Either null or points to encoded data after this entry. |
Ian Rogers | 96faf5b | 2013-08-09 22:05:32 -0700 | [diff] [blame] | 187 | uint32_t native_pc_offset_; // The current value of native pc offset. |
| 188 | uint32_t dex_pc_; // The current value of dex pc. |
| 189 | }; |
| 190 | |
| 191 | PcToDexIterator PcToDexBegin() const { |
| 192 | return PcToDexIterator(this, 0); |
| 193 | } |
| 194 | |
| 195 | PcToDexIterator PcToDexEnd() const { |
| 196 | uint32_t size = PcToDexSize(); |
| 197 | return PcToDexIterator(this, size); |
| 198 | } |
| 199 | |
| 200 | private: |
| 201 | const uint8_t* const encoded_table_; |
| 202 | }; |
| 203 | |
| 204 | } // namespace art |
| 205 | |
| 206 | #endif // ART_RUNTIME_MAPPING_TABLE_H_ |