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-rw-r--r--libunwindstack/LocalUnwinder.cpp130
1 files changed, 0 insertions, 130 deletions
diff --git a/libunwindstack/LocalUnwinder.cpp b/libunwindstack/LocalUnwinder.cpp
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--- a/libunwindstack/LocalUnwinder.cpp
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-/*
- * Copyright (C) 2018 The Android Open Source Project
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#include <pthread.h>
-#include <stdint.h>
-
-#include <memory>
-#include <string>
-#include <vector>
-
-#include <unwindstack/Elf.h>
-#include <unwindstack/LocalUnwinder.h>
-#include <unwindstack/MapInfo.h>
-#include <unwindstack/Maps.h>
-#include <unwindstack/Memory.h>
-#include <unwindstack/Regs.h>
-#include <unwindstack/RegsGetLocal.h>
-
-namespace unwindstack {
-
-bool LocalUnwinder::Init() {
- // Create the maps.
- maps_.reset(new unwindstack::LocalUpdatableMaps());
- if (!maps_->Parse()) {
- maps_.reset();
- return false;
- }
-
- process_memory_ = unwindstack::Memory::CreateProcessMemoryThreadCached(getpid());
-
- return true;
-}
-
-bool LocalUnwinder::ShouldSkipLibrary(const std::string& map_name) {
- for (const std::string& skip_library : skip_libraries_) {
- if (skip_library == map_name) {
- return true;
- }
- }
- return false;
-}
-
-bool LocalUnwinder::Unwind(std::vector<LocalFrameData>* frame_info, size_t max_frames) {
- std::unique_ptr<unwindstack::Regs> regs(unwindstack::Regs::CreateFromLocal());
- unwindstack::RegsGetLocal(regs.get());
- ArchEnum arch = regs->Arch();
-
- // Clear any cached data from previous unwinds.
- process_memory_->Clear();
-
- size_t num_frames = 0;
- bool adjust_pc = false;
- while (true) {
- uint64_t cur_pc = regs->pc();
- uint64_t cur_sp = regs->sp();
-
- std::shared_ptr<MapInfo> map_info = maps_->Find(cur_pc);
- if (map_info == nullptr) {
- break;
- }
-
- Elf* elf = map_info->GetElf(process_memory_, arch);
- uint64_t rel_pc = elf->GetRelPc(cur_pc, map_info.get());
- uint64_t step_pc = rel_pc;
- uint64_t pc_adjustment;
- if (adjust_pc) {
- pc_adjustment = GetPcAdjustment(rel_pc, elf, arch);
- } else {
- pc_adjustment = 0;
- }
- step_pc -= pc_adjustment;
-
- bool finished = false;
- bool is_signal_frame = false;
- if (elf->StepIfSignalHandler(rel_pc, regs.get(), process_memory_.get())) {
- step_pc = rel_pc;
- } else if (!elf->Step(step_pc, regs.get(), process_memory_.get(), &finished,
- &is_signal_frame)) {
- finished = true;
- }
-
- // Skip any locations that are within this library.
- if (num_frames != 0 || !ShouldSkipLibrary(map_info->name())) {
- // Add frame information.
- SharedString func_name;
- uint64_t func_offset;
- if (elf->GetFunctionName(rel_pc, &func_name, &func_offset)) {
- frame_info->emplace_back(map_info, cur_pc - pc_adjustment, rel_pc - pc_adjustment,
- func_name, func_offset);
- } else {
- frame_info->emplace_back(map_info, cur_pc - pc_adjustment, rel_pc - pc_adjustment, "", 0);
- }
- num_frames++;
- }
-
- if (finished || frame_info->size() == max_frames ||
- (cur_pc == regs->pc() && cur_sp == regs->sp())) {
- break;
- }
- adjust_pc = true;
- }
- return num_frames != 0;
-}
-
-} // namespace unwindstack