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// -*- C++ -*-

// Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010

// Free Software Foundation, Inc.

//

// This file is part of the GNU ISO C++ Library.  This library is free

// software; you can redistribute it and/or modify it under the terms

// of the GNU General Public License as published by the Free Software

// Foundation; either version 3, or (at your option) any later

// version.

// This library is distributed in the hope that it will be useful, but

// WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

// General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional

// permissions described in the GCC Runtime Library Exception, version

// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and

// a copy of the GCC Runtime Library Exception along with this program;

// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

// <http://www.gnu.org/licenses/>.

// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.

// Permission to use, copy, modify, sell, and distribute this software

// is hereby granted without fee, provided that the above copyright

// notice appears in all copies, and that both that copyright notice

// and this permission notice appear in supporting documentation. None

// of the above authors, nor IBM Haifa Research Laboratories, make any

// representation about the suitability of this software for any

// purpose. It is provided "as is" without express or implied

// warranty.

/** @file ext/throw_allocator.h

 *  This file is a GNU extension to the Standard C++ Library.

 *

 *  Contains two exception-generating types (throw_value, throw_allocator)

 *  intended to be used as value and allocator types while testing

 *  exception safety in templatized containers and algorithms. The

 *  allocator has additional log and debug features. The exception

 *  generated is of type forced_exception_error.

 */

#ifndef _THROW_ALLOCATOR_H

#define _THROW_ALLOCATOR_H 1

#include <cmath>

#include <ctime>

#include <map>

#include <string>

#include <ostream>

#include <stdexcept>

#include <utility>

#include <bits/functexcept.h>

#include <bits/move.h>

#ifdef __GXX_EXPERIMENTAL_CXX0X__

# include <functional>

# include <random>

#else

# include <tr1/functional>

# include <tr1/random>

#endif

_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)

  /**

   *  @brief Thown by exception safety machinery.

   *  @ingroup exceptions

   */

  struct forced_error : public std::exception

  { };

  // Substitute for forced_error object when -fno-exceptions.

  inline void

  __throw_forced_error()

  {

#if __EXCEPTIONS

    throw forced_error();

#else

    __builtin_abort();

#endif

  }

  /**

   *  @brief Base class for checking address and label information

   *  about allocations. Create a std::map between the allocated

   *  address (void*) and a datum for annotations, which are a pair of

   *  numbers corresponding to label and allocated size.

   */

  struct annotate_base

  {

    annotate_base()

    {

      label();

      map();

    }

    static void

    set_label(size_t l)

    { label() = l; }

    static size_t

    get_label()

    { return label(); }

    void

    insert(void* p, size_t size)

    {

      if (p == NULL)

        {

          std::string error("annotate_base::insert null insert!\n");

          log_to_string(error, make_entry(p, size));

          std::__throw_logic_error(error.c_str());

        }

      const_iterator found = map().find(p);

      if (found != map().end())

        {

          std::string error("annotate_base::insert double insert!\n");

          log_to_string(error, make_entry(p, size));

          log_to_string(error, *found);

          std::__throw_logic_error(error.c_str());

        }

      map().insert(make_entry(p, size));

    }

    void

    erase(void* p, size_t size)

    {

      check_allocated(p, size);

      map().erase(p);

    }

    // See if a particular address and allocation size has been saved.

    inline void

    check_allocated(void* p, size_t size)

    {

      const_iterator found = map().find(p);

      if (found == map().end())

        {

          std::string error("annotate_base::check_allocated by value "

                            "null erase!\n");

          log_to_string(error, make_entry(p, size));

          std::__throw_logic_error(error.c_str());

        }

      if (found->second.second != size)

        {

          std::string error("annotate_base::check_allocated by value "

                            "wrong-size erase!\n");

          log_to_string(error, make_entry(p, size));

          log_to_string(error, *found);

          std::__throw_logic_error(error.c_str());

        }

    }

    // See if a given label has been allocated.

    inline void

    check_allocated(size_t label)

    {

      const_iterator beg = map().begin();

      const_iterator end = map().end();

      std::string found;

      while (beg != end)

        {

          if (beg->second.first == label)

            log_to_string(found, *beg);

          ++beg;

        }

      if (!found.empty())

        {

          std::string error("annotate_base::check_allocated by label\n");

          error += found;

          std::__throw_logic_error(error.c_str());

        }

    }

  private:

    typedef std::pair<size_t, size_t>           data_type;

    typedef std::map<void*, data_type>          map_type;

    typedef map_type::value_type                entry_type;

    typedef map_type::const_iterator            const_iterator;

    typedef map_type::const_reference           const_reference;

    friend std::ostream&

    operator<<(std::ostream&, const annotate_base&);

    entry_type

    make_entry(void* p, size_t size)

    { return std::make_pair(p, data_type(get_label(), size)); }

    void

    log_to_string(std::string& s, const_reference ref) const

    {

      char buf[40];

      const char tab('\t');

      s += "label: ";

      unsigned long l = static_cast<unsigned long>(ref.second.first);

      __builtin_sprintf(buf, "%lu", l);

      s += buf;

      s += tab;

      s += "size: ";

      l = static_cast<unsigned long>(ref.second.second);

      __builtin_sprintf(buf, "%lu", l);

      s += buf;

      s += tab;

      s += "address: ";

      __builtin_sprintf(buf, "%p", ref.first);

      s += buf;

      s += '\n';

    }

    static size_t&

    label()

    {

      static size_t _S_label(std::numeric_limits<size_t>::max());

      return _S_label;

    }

    static map_type&

    map()

    {

      static map_type _S_map;

      return _S_map;

    }

  };

  inline std::ostream&

  operator<<(std::ostream& os, const annotate_base& __b)

  {

    std::string error;

    typedef annotate_base base_type;

    base_type::const_iterator beg = __b.map().begin();

    base_type::const_iterator end = __b.map().end();

    for (; beg != end; ++beg)

      __b.log_to_string(error, *beg);

    return os << error;

  }

  /**

   *  @brief Base struct for condition policy.

   *

   * Requires a public member function with the signature

   * void throw_conditionally()

   */

  struct condition_base

  {

    virtual ~condition_base() { };

  };

  /**

   *  @brief Base class for incremental control and throw.

   */

  struct limit_condition : public condition_base

  {

    // Scope-level adjustor objects: set limit for throw at the

    // beginning of a scope block, and restores to previous limit when

    // object is destroyed on exiting the block.

    struct adjustor_base

    {

    private:

      const size_t _M_orig;

    public:

      adjustor_base() : _M_orig(limit()) { }

      virtual

      ~adjustor_base() { set_limit(_M_orig); }

    };

    /// Never enter the condition.

    struct never_adjustor : public adjustor_base

    {

      never_adjustor() { set_limit(std::numeric_limits<size_t>::max()); }

    };

    /// Always enter the condition.

    struct always_adjustor : public adjustor_base

    {

      always_adjustor() { set_limit(count()); }

    };

    /// Enter the nth condition.

    struct limit_adjustor : public adjustor_base

    {

      limit_adjustor(const size_t __l) { set_limit(__l); }

    };

    // Increment _S_count every time called.

    // If _S_count matches the limit count, throw.

    static void

    throw_conditionally()

    {

      if (count() == limit())

        __throw_forced_error();

      ++count();

    }

    static size_t&

    count()

    {

      static size_t _S_count(0);

      return _S_count;

    }

    static size_t&

    limit()

    {

      static size_t _S_limit(std::numeric_limits<size_t>::max());

      return _S_limit;

    }

    // Zero the throw counter, set limit to argument.

    static void

    set_limit(const size_t __l)

    {

      limit() = __l;

      count() = 0;

    }

  };

  /**

   *  @brief Base class for random probability control and throw.

   */

  struct random_condition : public condition_base

  {

    // Scope-level adjustor objects: set probability for throw at the

    // beginning of a scope block, and restores to previous

    // probability when object is destroyed on exiting the block.

    struct adjustor_base

    {

    private:

      const double _M_orig;

    public:

      adjustor_base() : _M_orig(probability()) { }

      virtual ~adjustor_base()

      { set_probability(_M_orig); }

    };

    /// Group condition.

    struct group_adjustor : public adjustor_base

    {

      group_adjustor(size_t size)

      { set_probability(1 - std::pow(double(1 - probability()),

                                     double(0.5 / (size + 1))));

      }

    };

    /// Never enter the condition.

    struct never_adjustor : public adjustor_base

    {

      never_adjustor() { set_probability(0); }

    };

    /// Always enter the condition.

    struct always_adjustor : public adjustor_base

    {

      always_adjustor() { set_probability(1); }

    };

    random_condition()

    {

      probability();

      engine();

    }

    static void

    set_probability(double __p)

    { probability() = __p; }

    static void

    throw_conditionally()

    {

      if (generate() < probability())

        __throw_forced_error();

    }

    void

    seed(unsigned long __s)

    { engine().seed(__s); }

  private:

#ifdef __GXX_EXPERIMENTAL_CXX0X__

    typedef std::uniform_real_distribution<double>      distribution_type;

    typedef std::mt19937                                engine_type;

#else

    typedef std::tr1::uniform_real<double>              distribution_type;

    typedef std::tr1::mt19937                           engine_type;

#endif

    static double

    generate()

    {

#ifdef __GXX_EXPERIMENTAL_CXX0X__

      const distribution_type distribution(0, 1);

      static auto generator = std::bind(distribution, engine());

#else

      // Use variate_generator to get normalized results.

      typedef std::tr1::variate_generator<engine_type, distribution_type> gen_t;

      distribution_type distribution(0, 1);

      static gen_t generator(engine(), distribution);

#endif

      double random = generator();

      if (random < distribution.min() || random > distribution.max())

        {

          std::string __s("random_condition::generate");

          __s += "\n";

          __s += "random number generated is: ";

          char buf[40];

          __builtin_sprintf(buf, "%f", random);

          __s += buf;

          std::__throw_out_of_range(__s.c_str());

        }

      return random;

    }

    static double&

    probability()

    {

      static double _S_p;

      return _S_p;

    }

    static engine_type&

    engine()

    {

      static engine_type _S_e;

      return _S_e;

    }

  };

  /**

   *  @brief Class with exception generation control. Intended to be

   *  used as a value_type in templatized code.

   *

   *  Note: Destructor not allowed to throw.

   */

  template<typename _Cond>

    struct throw_value_base : public _Cond

    {

      typedef _Cond                             condition_type;

      using condition_type::throw_conditionally;

      std::size_t                               _M_i;

#ifndef _GLIBCXX_IS_AGGREGATE

      throw_value_base() : _M_i(0)

      { throw_conditionally(); }

      throw_value_base(const throw_value_base& __v) : _M_i(__v._M_i)

      { throw_conditionally(); }

      explicit throw_value_base(const std::size_t __i) : _M_i(__i)

      { throw_conditionally(); }

#endif

      throw_value_base&

      operator=(const throw_value_base& __v)

      {

        throw_conditionally();

        _M_i = __v._M_i;

        return *this;

      }

      throw_value_base&

      operator++()

      {

        throw_conditionally();

        ++_M_i;

        return *this;

      }

    };

  template<typename _Cond>

    inline void

    swap(throw_value_base<_Cond>& __a, throw_value_base<_Cond>& __b)

    {

      typedef throw_value_base<_Cond> throw_value;

      throw_value::throw_conditionally();

      throw_value orig(__a);

      __a = __b;

      __b = orig;

    }

  // General instantiable types requirements.

  template<typename _Cond>

    inline bool

    operator==(const throw_value_base<_Cond>& __a,

               const throw_value_base<_Cond>& __b)

    {

      typedef throw_value_base<_Cond> throw_value;

      throw_value::throw_conditionally();

      bool __ret = __a._M_i == __b._M_i;

      return __ret;

    }

  template<typename _Cond>

    inline bool

    operator<(const throw_value_base<_Cond>& __a,

              const throw_value_base<_Cond>& __b)

    {

      typedef throw_value_base<_Cond> throw_value;

      throw_value::throw_conditionally();

      bool __ret = __a._M_i < __b._M_i;

      return __ret;

    }

  // Numeric algorithms instantiable types requirements.

  template<typename _Cond>

    inline throw_value_base<_Cond>

    operator+(const throw_value_base<_Cond>& __a,

              const throw_value_base<_Cond>& __b)

    {

      typedef throw_value_base<_Cond> throw_value;

      throw_value::throw_conditionally();

      throw_value __ret(__a._M_i + __b._M_i);

      return __ret;

    }

  template<typename _Cond>

    inline throw_value_base<_Cond>

    operator-(const throw_value_base<_Cond>& __a,

              const throw_value_base<_Cond>& __b)

    {

      typedef throw_value_base<_Cond> throw_value;

      throw_value::throw_conditionally();

      throw_value __ret(__a._M_i - __b._M_i);

      return __ret;

    }

  template<typename _Cond>

    inline throw_value_base<_Cond>

    operator*(const throw_value_base<_Cond>& __a,

              const throw_value_base<_Cond>& __b)

    {

      typedef throw_value_base<_Cond> throw_value;

      throw_value::throw_conditionally();

      throw_value __ret(__a._M_i * __b._M_i);

      return __ret;

    }

  /// Type throwing via limit condition.

  struct throw_value_limit : public throw_value_base<limit_condition>

  {

    typedef throw_value_base<limit_condition> base_type;

#ifndef _GLIBCXX_IS_AGGREGATE

    throw_value_limit() { }

    throw_value_limit(const throw_value_limit& __other)

    : base_type(__other._M_i) { }

    explicit throw_value_limit(const std::size_t __i) : base_type(__i) { }

#endif

  };

  /// Type throwing via random condition.

  struct throw_value_random : public throw_value_base<random_condition>

  {

    typedef throw_value_base<random_condition> base_type;

#ifndef _GLIBCXX_IS_AGGREGATE

    throw_value_random() { }

    throw_value_random(const throw_value_random& __other)

    : base_type(__other._M_i) { }

    explicit throw_value_random(const std::size_t __i) : base_type(__i) { }

#endif

  };

  /**

   *  @brief Allocator class with logging and exception generation control.

   * Intended to be used as an allocator_type in templatized code.

   *  @ingroup allocators

   *

   *  Note: Deallocate not allowed to throw.

   */

  template<typename _Tp, typename _Cond>

    class throw_allocator_base

    : public annotate_base, public _Cond

    {

    public:

      typedef size_t                            size_type;

      typedef ptrdiff_t                         difference_type;

      typedef _Tp                               value_type;

      typedef value_type*                       pointer;

      typedef const value_type*                 const_pointer;

      typedef value_type&                       reference;

      typedef const value_type&                 const_reference;

    private:

      typedef _Cond                             condition_type;

      std::allocator<value_type>                _M_allocator;

      using condition_type::throw_conditionally;

    public:

      size_type

      max_size() const throw()

      { return _M_allocator.max_size(); }

      pointer

      allocate(size_type __n, std::allocator<void>::const_pointer hint = 0)

      {

        if (__n > this->max_size())

          std::__throw_bad_alloc();

        throw_conditionally();

        pointer const a = _M_allocator.allocate(__n, hint);

        insert(a, sizeof(value_type) * __n);

        return a;

      }

      void

      construct(pointer __p, const value_type& val)

      { return _M_allocator.construct(__p, val); }

#ifdef __GXX_EXPERIMENTAL_CXX0X__

      template<typename... _Args>

        void

        construct(pointer __p, _Args&&... __args)

        { return _M_allocator.construct(__p, std::forward<_Args>(__args)...); }

#endif

      void

      destroy(pointer __p)

      { _M_allocator.destroy(__p); }

      void

      deallocate(pointer __p, size_type __n)

      {

        erase(__p, sizeof(value_type) * __n);

        _M_allocator.deallocate(__p, __n);

      }

      void

      check_allocated(pointer __p, size_type __n)

      {

        size_type __t = sizeof(value_type) * __n;

        annotate_base::check_allocated(__p, __t);

      }

      void

      check_allocated(size_type __n)

      { annotate_base::check_allocated(__n); }

  };

  template<typename _Tp, typename _Cond>

    inline bool

    operator==(const throw_allocator_base<_Tp, _Cond>&,

               const throw_allocator_base<_Tp, _Cond>&)

    { return true; }

  template<typename _Tp, typename _Cond>

    inline bool

    operator!=(const throw_allocator_base<_Tp, _Cond>&,

               const throw_allocator_base<_Tp, _Cond>&)

    { return false; }

  /// Allocator throwing via limit condition.

  template<typename _Tp>

    struct throw_allocator_limit

    : public throw_allocator_base<_Tp, limit_condition>

    {

      template<typename _Tp1>

        struct rebind

        { typedef throw_allocator_limit<_Tp1> other; };

      throw_allocator_limit() throw() { }

      throw_allocator_limit(const throw_allocator_limit&) throw() { }

      template<typename _Tp1>

        throw_allocator_limit(const throw_allocator_limit<_Tp1>&) throw() { }

      ~throw_allocator_limit() throw() { }

    };

  /// Allocator throwing via random condition.