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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef SIMPLE_PERF_OFFLINE_UNWINDER_H_
#define SIMPLE_PERF_OFFLINE_UNWINDER_H_
#include <memory>
#include <vector>
#include <unordered_map>
#include "perf_regs.h"
#include "thread_tree.h"
#if defined(__linux__)
#include <unwindstack/Maps.h>
#endif
namespace simpleperf {
struct ThreadEntry;
struct UnwindingResult {
// time used for unwinding, in ns.
uint64_t used_time;
enum {
UNKNOWN_REASON,
EXCEED_MAX_FRAMES_LIMIT,
ACCESS_REG_FAILED,
ACCESS_STACK_FAILED,
ACCESS_MEM_FAILED,
FIND_PROC_INFO_FAILED,
EXECUTE_DWARF_INSTRUCTION_FAILED,
DIFFERENT_ARCH,
MAP_MISSING,
} stop_reason;
union {
// for ACCESS_REG_FAILED
uint64_t regno;
// for ACCESS_MEM_FAILED and ACCESS_STACK_FAILED
uint64_t addr;
} stop_info;
uint64_t stack_start;
uint64_t stack_end;
};
#if defined(__linux__)
class UnwindMaps : public unwindstack::Maps {
public:
void UpdateMaps(const MapSet& map_set);
private:
uint64_t version_ = 0u;
std::vector<const MapEntry*> entries_;
};
class OfflineUnwinder {
public:
OfflineUnwinder(bool collect_stat);
bool UnwindCallChain(const ThreadEntry& thread, const RegSet& regs, const char* stack,
size_t stack_size, std::vector<uint64_t>* ips, std::vector<uint64_t>* sps);
bool HasStat() const {
return collect_stat_;
}
const UnwindingResult& GetUnwindingResult() const {
return unwinding_result_;
}
bool IsCallChainBrokenForIncompleteJITDebugInfo() {
return is_callchain_broken_for_incomplete_jit_debug_info_;
}
private:
bool collect_stat_;
UnwindingResult unwinding_result_;
bool is_callchain_broken_for_incomplete_jit_debug_info_;
std::unordered_map<pid_t, UnwindMaps> cached_maps_;
};
#else // defined(__linux__)
class OfflineUnwinder {
public:
OfflineUnwinder(bool) {}
bool UnwindCallChain(const ThreadEntry&, const RegSet&, const char*, size_t,
std::vector<uint64_t>*, std::vector<uint64_t>*) {
return false;
}
};
#endif // !defined(__linux__)
} // namespace simpleperf
#endif // SIMPLE_PERF_OFFLINE_UNWINDER_H_
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