1 /**
2 * Copyright (c) 2021-2022 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)20 CodeDataAccessor::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)29 CodeDataAccessor::TryBlock::TryBlock(Span<const uint8_t> data) : data_(data), size_(0)
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)37 CodeDataAccessor::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 THROW_IF(sp.Size() < code_size_, File::INVALID_FILE_OFFSET);
48 sp = sp.SubSpan(code_size_);
49 try_blocks_sp_ = sp;
50 }
51
52 } // namespace panda::panda_file
53