arangodb/lib/Basics/debugging.h

////////////////////////////////////////////////////////////////////////////////
/// DISCLAIMER
///
/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
///
/// 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.
///
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
///
/// @author Jan Steemann
////////////////////////////////////////////////////////////////////////////////

#ifndef LIB_BASICS_DEBUGGING_H
#define LIB_BASICS_DEBUGGING_H 1

#ifndef TRI_WITHIN_COMMON
#error use <Basics/Common.h>
#endif

#include <ostream>


////////////////////////////////////////////////////////////////////////////////
/// @brief macro TRI_IF_FAILURE
/// this macro can be used in maintainer mode to make the server fail at
/// certain locations in the C code. The points at which a failure is actually
/// triggered can be defined at runtime using TRI_AddFailurePointDebugging().
////////////////////////////////////////////////////////////////////////////////

#ifdef TRI_ENABLE_FAILURE_TESTS

#define TRI_IF_FAILURE(what) if (TRI_ShouldFailDebugging(what))

#else

#define TRI_IF_FAILURE(what) if (false)

#endif


////////////////////////////////////////////////////////////////////////////////
/// @brief cause a segmentation violation
////////////////////////////////////////////////////////////////////////////////

#ifdef TRI_ENABLE_FAILURE_TESTS
void TRI_SegfaultDebugging(char const*);
#else
static inline void TRI_SegfaultDebugging(char const* unused) { (void)unused; }
#endif

////////////////////////////////////////////////////////////////////////////////
/// @brief check whether we should fail at a failure point
////////////////////////////////////////////////////////////////////////////////

#ifdef TRI_ENABLE_FAILURE_TESTS
bool TRI_ShouldFailDebugging(char const*);
#else
static inline bool TRI_ShouldFailDebugging(char const* unused) {
  (void)unused;
  return false;
}
#endif

////////////////////////////////////////////////////////////////////////////////
/// @brief add a failure point
////////////////////////////////////////////////////////////////////////////////

#ifdef TRI_ENABLE_FAILURE_TESTS
void TRI_AddFailurePointDebugging(char const*);
#else
static inline void TRI_AddFailurePointDebugging(char const* unused) {
  (void)unused;
}
#endif

////////////////////////////////////////////////////////////////////////////////
/// @brief remove a failure point
////////////////////////////////////////////////////////////////////////////////

#ifdef TRI_ENABLE_FAILURE_TESTS
void TRI_RemoveFailurePointDebugging(char const*);
#else
static inline void TRI_RemoveFailurePointDebugging(char const* unused) {
  (void)unused;
}
#endif

////////////////////////////////////////////////////////////////////////////////
/// @brief clear all failure points
////////////////////////////////////////////////////////////////////////////////

#ifdef TRI_ENABLE_FAILURE_TESTS
void TRI_ClearFailurePointsDebugging(void);
#else
static inline void TRI_ClearFailurePointsDebugging(void) {}
#endif

////////////////////////////////////////////////////////////////////////////////
/// @brief returns whether failure point debugging can be used
////////////////////////////////////////////////////////////////////////////////

static inline bool TRI_CanUseFailurePointsDebugging(void) {
#ifdef TRI_ENABLE_FAILURE_TESTS
  return true;
#else
  return false;
#endif
}

////////////////////////////////////////////////////////////////////////////////
/// @brief appends a backtrace to the string provided
////////////////////////////////////////////////////////////////////////////////

void TRI_GetBacktrace(std::string& btstr);

////////////////////////////////////////////////////////////////////////////////
/// @brief prints a backtrace on stderr
////////////////////////////////////////////////////////////////////////////////

void TRI_PrintBacktrace();

////////////////////////////////////////////////////////////////////////////////
/// @brief initialize the debugging
////////////////////////////////////////////////////////////////////////////////

void TRI_InitializeDebugging(void);

////////////////////////////////////////////////////////////////////////////////
/// @brief shutdown the debugging
////////////////////////////////////////////////////////////////////////////////

void TRI_ShutdownDebugging(void);

////////////////////////////////////////////////////////////////////////////////
/// @brief dump vector contents to an ostream
////////////////////////////////////////////////////////////////////////////////

template <typename T>
std::ostream& operator<<(std::ostream& stream, std::vector<T> const& data) {
  bool first = true;

  stream << "[";
  for (auto const& it : data) {
    if (first) {
      stream << " ";
      first = false;
    } else {
      stream << ", ";
    }
    stream << it;
  }
  stream << " ]";

  return stream;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief dump unordered_set contents to an ostream
////////////////////////////////////////////////////////////////////////////////

template <typename T>
std::ostream& operator<<(std::ostream& stream,
                         std::unordered_set<T> const& data) {
  bool first = true;

  stream << "{";
  for (auto const& it : data) {
    if (first) {
      stream << " ";
      first = false;
    } else {
      stream << ", ";
    }
    stream << it;
  }
  stream << " }";

  return stream;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief dump unordered_map contents to an ostream
////////////////////////////////////////////////////////////////////////////////

template <typename K, typename V>
std::ostream& operator<<(std::ostream& stream,
                         std::unordered_map<K, V> const& data) {
  bool first = true;

  stream << "{";
  for (auto const& it : data) {
    if (first) {
      stream << " ";
      first = false;
    } else {
      stream << ", ";
    }
    stream << it.first << ": " << it.second;
  }
  stream << " }";

  return stream;
}

#endif