1 /* 2 * Copyright (c) 2021 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 #include "code_data_accessor.h" 17 18 namespace panda::panda_file { 19 CatchBlock(Span<const uint8_t> data)20CodeDataAccessor::CatchBlock::CatchBlock(Span<const uint8_t> data) 21 { 22 auto sp = data; 23 type_idx_ = helpers::ReadULeb128(&sp) - 1; 24 handler_pc_ = helpers::ReadULeb128(&sp); 25 code_size_ = helpers::ReadULeb128(&sp); 26 size_ = sp.data() - data.data(); 27 } 28 TryBlock(Span<const uint8_t> data)29CodeDataAccessor::TryBlock::TryBlock(Span<const uint8_t> data) : data_(data) 30 { 31 start_pc_ = helpers::ReadULeb128(&data); 32 length_ = helpers::ReadULeb128(&data); 33 num_catches_ = helpers::ReadULeb128(&data); 34 catch_blocks_sp_ = data; 35 } 36 CodeDataAccessor(const File & panda_file,File::EntityId code_id)37CodeDataAccessor::CodeDataAccessor(const File &panda_file, File::EntityId code_id) 38 : panda_file_(panda_file), code_id_(code_id), size_(0) 39 { 40 auto sp = panda_file_.GetSpanFromId(code_id_); 41 42 num_vregs_ = helpers::ReadULeb128(&sp); 43 num_args_ = helpers::ReadULeb128(&sp); 44 code_size_ = helpers::ReadULeb128(&sp); 45 tries_size_ = helpers::ReadULeb128(&sp); 46 instructions_ptr_ = sp.data(); 47 sp = sp.SubSpan(code_size_); 48 try_blocks_sp_ = sp; 49 } 50 51 } // namespace panda::panda_file 52