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106 lines
3.0 KiB
106 lines
3.0 KiB
4 months ago
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/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "dex_file_exception_helpers.h"
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#include "code_item_accessors-inl.h"
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#include "dex_file_structs.h"
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namespace art {
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CatchHandlerIterator::CatchHandlerIterator(const CodeItemDataAccessor& accessor, uint32_t address) {
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handler_.address_ = -1;
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int32_t offset = -1;
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// Short-circuit the overwhelmingly common cases.
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switch (accessor.TriesSize()) {
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case 0:
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break;
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case 1: {
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const dex::TryItem* tries = accessor.TryItems().begin();
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uint32_t start = tries->start_addr_;
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if (address >= start) {
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uint32_t end = start + tries->insn_count_;
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if (address < end) {
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offset = tries->handler_off_;
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}
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}
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break;
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}
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default: {
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const dex::TryItem* try_item = accessor.FindTryItem(address);
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offset = try_item != nullptr ? try_item->handler_off_ : -1;
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break;
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}
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}
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Init(accessor, offset);
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}
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CatchHandlerIterator::CatchHandlerIterator(const CodeItemDataAccessor& accessor,
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const dex::TryItem& try_item) {
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handler_.address_ = -1;
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Init(accessor, try_item.handler_off_);
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}
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void CatchHandlerIterator::Init(const CodeItemDataAccessor& accessor, int32_t offset) {
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if (offset >= 0) {
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Init(accessor.GetCatchHandlerData(offset));
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} else {
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// Not found, initialize as empty
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current_data_ = nullptr;
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remaining_count_ = -1;
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catch_all_ = false;
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DCHECK(!HasNext());
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}
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}
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void CatchHandlerIterator::Init(const uint8_t* handler_data) {
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current_data_ = handler_data;
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remaining_count_ = DecodeSignedLeb128(¤t_data_);
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// If remaining_count_ is non-positive, then it is the negative of
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// the number of catch types, and the catches are followed by a
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// catch-all handler.
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if (remaining_count_ <= 0) {
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catch_all_ = true;
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remaining_count_ = -remaining_count_;
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} else {
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catch_all_ = false;
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}
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Next();
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}
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void CatchHandlerIterator::Next() {
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if (remaining_count_ > 0) {
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handler_.type_idx_ = dex::TypeIndex(DecodeUnsignedLeb128(¤t_data_));
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handler_.address_ = DecodeUnsignedLeb128(¤t_data_);
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remaining_count_--;
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return;
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}
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if (catch_all_) {
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handler_.type_idx_ = dex::TypeIndex(DexFile::kDexNoIndex16);
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handler_.address_ = DecodeUnsignedLeb128(¤t_data_);
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catch_all_ = false;
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return;
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}
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// no more handler
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remaining_count_ = -1;
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}
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} // namespace art
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