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_COMPILER_DWARF_WRITER_H_ 18 #define ART_COMPILER_DWARF_WRITER_H_ 19 20 #include <vector> 21 #include "base/bit_utils.h" 22 #include "base/logging.h" 23 #include "leb128.h" 24 25 namespace art { 26 namespace dwarf { 27 28 // The base class for all DWARF writers. 29 template<typename Allocator = std::allocator<uint8_t>> 30 class Writer { 31 public: 32 void PushUint8(int value) { 33 DCHECK_GE(value, 0); 34 DCHECK_LE(value, UINT8_MAX); 35 data_->push_back(value & 0xff); 36 } 37 38 void PushUint16(int value) { 39 DCHECK_GE(value, 0); 40 DCHECK_LE(value, UINT16_MAX); 41 data_->push_back((value >> 0) & 0xff); 42 data_->push_back((value >> 8) & 0xff); 43 } 44 45 void PushUint32(uint32_t value) { 46 data_->push_back((value >> 0) & 0xff); 47 data_->push_back((value >> 8) & 0xff); 48 data_->push_back((value >> 16) & 0xff); 49 data_->push_back((value >> 24) & 0xff); 50 } 51 52 void PushUint32(int value) { 53 DCHECK_GE(value, 0); 54 PushUint32(static_cast<uint32_t>(value)); 55 } 56 57 void PushUint32(uint64_t value) { 58 DCHECK_LE(value, UINT32_MAX); 59 PushUint32(static_cast<uint32_t>(value)); 60 } 61 62 void PushUint64(uint64_t value) { 63 data_->push_back((value >> 0) & 0xff); 64 data_->push_back((value >> 8) & 0xff); 65 data_->push_back((value >> 16) & 0xff); 66 data_->push_back((value >> 24) & 0xff); 67 data_->push_back((value >> 32) & 0xff); 68 data_->push_back((value >> 40) & 0xff); 69 data_->push_back((value >> 48) & 0xff); 70 data_->push_back((value >> 56) & 0xff); 71 } 72 73 void PushInt8(int value) { 74 DCHECK_GE(value, INT8_MIN); 75 DCHECK_LE(value, INT8_MAX); 76 PushUint8(static_cast<uint8_t>(value)); 77 } 78 79 void PushInt16(int value) { 80 DCHECK_GE(value, INT16_MIN); 81 DCHECK_LE(value, INT16_MAX); 82 PushUint16(static_cast<uint16_t>(value)); 83 } 84 85 void PushInt32(int value) { 86 PushUint32(static_cast<uint32_t>(value)); 87 } 88 89 void PushInt64(int64_t value) { 90 PushUint64(static_cast<uint64_t>(value)); 91 } 92 93 // Variable-length encoders. 94 95 void PushUleb128(uint32_t value) { 96 EncodeUnsignedLeb128(data_, value); 97 } 98 99 void PushUleb128(int value) { 100 DCHECK_GE(value, 0); 101 EncodeUnsignedLeb128(data_, value); 102 } 103 104 void PushSleb128(int value) { 105 EncodeSignedLeb128(data_, value); 106 } 107 108 // Miscellaneous functions. 109 110 void PushString(const char* value) { 111 data_->insert(data_->end(), value, value + strlen(value) + 1); 112 } 113 114 void PushData(const void* ptr, size_t size) { 115 const char* p = reinterpret_cast<const char*>(ptr); 116 data_->insert(data_->end(), p, p + size); 117 } 118 119 template<typename Allocator2> 120 void PushData(const std::vector<uint8_t, Allocator2>* buffer) { 121 data_->insert(data_->end(), buffer->begin(), buffer->end()); 122 } 123 124 void UpdateUint32(size_t offset, uint32_t value) { 125 DCHECK_LT(offset + 3, data_->size()); 126 (*data_)[offset + 0] = (value >> 0) & 0xFF; 127 (*data_)[offset + 1] = (value >> 8) & 0xFF; 128 (*data_)[offset + 2] = (value >> 16) & 0xFF; 129 (*data_)[offset + 3] = (value >> 24) & 0xFF; 130 } 131 132 void UpdateUint64(size_t offset, uint64_t value) { 133 DCHECK_LT(offset + 7, data_->size()); 134 (*data_)[offset + 0] = (value >> 0) & 0xFF; 135 (*data_)[offset + 1] = (value >> 8) & 0xFF; 136 (*data_)[offset + 2] = (value >> 16) & 0xFF; 137 (*data_)[offset + 3] = (value >> 24) & 0xFF; 138 (*data_)[offset + 4] = (value >> 32) & 0xFF; 139 (*data_)[offset + 5] = (value >> 40) & 0xFF; 140 (*data_)[offset + 6] = (value >> 48) & 0xFF; 141 (*data_)[offset + 7] = (value >> 56) & 0xFF; 142 } 143 144 void UpdateUleb128(size_t offset, uint32_t value) { 145 DCHECK_LE(offset + UnsignedLeb128Size(value), data_->size()); 146 UpdateUnsignedLeb128(data_->data() + offset, value); 147 } 148 149 void Pop() { 150 return data_->pop_back(); 151 } 152 153 void Pad(int alignment) { 154 DCHECK_NE(alignment, 0); 155 data_->resize(RoundUp(data_->size(), alignment), 0); 156 } 157 158 const std::vector<uint8_t, Allocator>* data() const { 159 return data_; 160 } 161 162 explicit Writer(std::vector<uint8_t, Allocator>* buffer) : data_(buffer) { } 163 164 private: 165 std::vector<uint8_t, Allocator>* data_; 166 167 DISALLOW_COPY_AND_ASSIGN(Writer); 168 }; 169 170 } // namespace dwarf 171 } // namespace art 172 173 #endif // ART_COMPILER_DWARF_WRITER_H_ 174
