simpleperf/OfflineUnwinder.h

/*
 * 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 "perf_regs.h"
#include "thread_tree.h"

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;
};

class OfflineUnwinder {
 public:
  static std::unique_ptr<OfflineUnwinder> Create(bool collect_stat);
  virtual ~OfflineUnwinder() {}

  virtual 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) = 0;

  const UnwindingResult& GetUnwindingResult() const {
    return unwinding_result_;
  }

  bool IsCallChainBrokenForIncompleteJITDebugInfo() {
    return is_callchain_broken_for_incomplete_jit_debug_info_;
  }

 protected:
  OfflineUnwinder() {}

  UnwindingResult unwinding_result_;
  bool is_callchain_broken_for_incomplete_jit_debug_info_ = false;
};

} // namespace simpleperf

#endif  // SIMPLE_PERF_OFFLINE_UNWINDER_H_