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// -*- C++ -*-

// Utility subroutines for the C++ library testsuite. 

//

// Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009

// 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.

//

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

// with this library; see the file COPYING3.  If not see

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

//

// This file provides the following:

//

// 1)  VERIFY(), via _GLIBCXX_ASSERT, from Brent Verner <brent@rcfile.org>.

//   This file is included in the various testsuite programs to provide

//   #define(able) assert() behavior for debugging/testing. It may be

//   a suitable location for other furry woodland creatures as well.

//

// 2)  set_memory_limits()

//   set_memory_limits() uses setrlimit() to restrict dynamic memory

//   allocation.  We provide a default memory limit if none is passed by the

//   calling application.  The argument to set_memory_limits() is the

//   limit in megabytes (a floating-point number).  If _GLIBCXX_RES_LIMITS is

//   not #defined before including this header, then no limiting is attempted.

//

// 3)  object_counter

//   This is a POD with a static data member, object_counter::count,

//   which starts at zero, increments on instance construction, and decrements

//   on instance destruction.  "assert_count(n)" can be called to VERIFY()

//   that the count equals N.

//

// 4)  copy_tracker, from Stephen M. Webb <stephen@bregmasoft.com>.

//   A class with nontrivial ctor/dtor that provides the ability to track the

//   number of copy ctors and dtors, and will throw on demand during copy.

#ifndef _GLIBCXX_TESTSUITE_HOOKS_H

#define _GLIBCXX_TESTSUITE_HOOKS_H

#include <bits/c++config.h>

#include <bits/functexcept.h>

#include <ctime>

#ifdef _GLIBCXX_HAVE_SYS_STAT_H

#include <sys/stat.h>

#endif

#ifdef _GLIBCXX_ASSERT

# include <cassert>

# define VERIFY(fn) assert(fn)

#else

# define VERIFY(fn) test &= (fn)

#endif

#ifdef _GLIBCXX_HAVE_UNISTD_H

# include <unistd.h>

#else

# define unlink(x)

#endif

namespace __gnu_test

{

  // All macros are defined in GLIBCXX_CONFIGURE_TESTSUITE and imported

  // from c++config.h

  // Set memory limits if possible, if not set to 0.

#ifndef _GLIBCXX_RES_LIMITS

#  define MEMLIMIT_MB 0

#else

# ifndef MEMLIMIT_MB

#  define MEMLIMIT_MB 16.0

# endif

#endif

  extern void

  set_memory_limits(float __size = MEMLIMIT_MB);

  extern void

  set_file_limit(unsigned long __size);

  // Check mangled name demangles (using __cxa_demangle) as expected.

  void

  verify_demangle(const char* mangled, const char* wanted);

  // Simple callback structure for variable numbers of tests (all with

  // same signature).  Assume all unit tests are of the signature

  // void test01(); 

  class func_callback

  {

  public:

    typedef void (*test_type) (void);

  private:

    int         _M_size;

    test_type   _M_tests[15];

    func_callback&

    operator=(const func_callback&);

    func_callback(const func_callback&);

  public:

    func_callback(): _M_size(0) { }

    int

    size() const { return _M_size; }

    const test_type*

    tests() const { return _M_tests; }

    void

    push_back(test_type test)

    {

      _M_tests[_M_size] = test;

      ++_M_size;

    }

  };

  // Run select unit tests after setting global locale.

  void

  run_tests_wrapped_locale(const char*, const func_callback&);

  // Run select unit tests after setting environment variables.

  void

  run_tests_wrapped_env(const char*, const char*, const func_callback&);

  // Counting.

  struct object_counter

  {

    // Specifically and glaringly-obviously marked 'signed' so that

    // when COUNT mistakenly goes negative, we can track the patterns

    // of deletions more easily.

    typedef  signed int     size_type;

    static size_type   count;

    object_counter() { ++count; }

    object_counter (const object_counter&) { ++count; }

    ~object_counter() { --count; }

  };

#define assert_count(n)   VERIFY(__gnu_test::object_counter::count == n)

  // A (static) class for counting copy constructors and possibly throwing an

  // exception on a desired count.

  class copy_constructor

  {

  public:

    static unsigned int

    count() { return count_; }

    static void

    mark_call()

    {

      count_++;

      if (count_ == throw_on_)

        std::__throw_runtime_error("copy_constructor::mark_call");

    }

    static void

    reset()

    {

      count_ = 0;

      throw_on_ = 0;

    }

    static void

    throw_on(unsigned int count) { throw_on_ = count; }

  private:

    static unsigned int count_;

    static unsigned int throw_on_;

  };

  // A (static) class for counting assignment operator calls and

  // possibly throwing an exception on a desired count.

  class assignment_operator

  {

  public:

    static unsigned int

    count() { return count_; }

    static void

    mark_call()

    {

      count_++;

      if (count_ == throw_on_)

        std::__throw_runtime_error("assignment_operator::mark_call");

    }

    static void

    reset()

    {

      count_ = 0;

      throw_on_ = 0;

    }

    static void

    throw_on(unsigned int count) { throw_on_ = count; }

  private:

    static unsigned int count_;

    static unsigned int throw_on_;

  };

  // A (static) class for tracking calls to an object's destructor.

  class destructor

  {

  public:

    static unsigned int

    count() { return _M_count; }

    static void

    mark_call() { _M_count++; }

    static void

    reset() { _M_count = 0; }

  private:

    static unsigned int _M_count;

  };

  // An class of objects that can be used for validating various

  // behaviours and guarantees of containers and algorithms defined in

  // the standard library.

  class copy_tracker

  {

  public:

    // Creates a copy-tracking object with the given ID number.  If

    // "throw_on_copy" is set, an exception will be thrown if an

    // attempt is made to copy this object.

    copy_tracker(int id = next_id_--, bool throw_on_copy = false)

    : id_(id) , throw_on_copy_(throw_on_copy) { }

    // Copy-constructs the object, marking a call to the copy

    // constructor and forcing an exception if indicated.

    copy_tracker(const copy_tracker& rhs)

    : id_(rhs.id()), throw_on_copy_(rhs.throw_on_copy_)

    {

      if (throw_on_copy_)

        copy_constructor::throw_on(copy_constructor::count() + 1);

      copy_constructor::mark_call();

    }

    // Assigns the value of another object to this one, tracking the

    // number of times this member function has been called and if the

    // other object is supposed to throw an exception when it is

    // copied, well, make it so.

    copy_tracker&

    operator=(const copy_tracker& rhs)

    {

      id_ = rhs.id();

      if (rhs.throw_on_copy_)

        assignment_operator::throw_on(assignment_operator::count() + 1);

      assignment_operator::mark_call();

      return *this;

    }

    ~copy_tracker()

    { destructor::mark_call(); }

    int

    id() const { return id_; }

    static void

    reset()

    {

      copy_constructor::reset();

      assignment_operator::reset();

      destructor::reset();

    }

  private:

    int   id_;

    const bool  throw_on_copy_;

    static int next_id_;

  };

  inline bool

  operator==(const copy_tracker& lhs, const copy_tracker& rhs)

  { return lhs.id() == rhs.id(); }

  inline bool

  operator<(const copy_tracker& lhs, const copy_tracker& rhs)

  { return lhs.id() < rhs.id(); }

  // Class for checking required type conversions, implicit and

  // explicit for given library data structures. 

  template<typename _Container>

    struct conversion

    {

      typedef typename _Container::const_iterator const_iterator;

      // Implicit conversion iterator to const_iterator.

      static const_iterator

      iterator_to_const_iterator()

      {

        _Container v;

        const_iterator it = v.begin();

        const_iterator end = v.end();

        return it == end ? v.end() : it;

      }

    };

  // A binary semaphore for use across multiple processes.

  class semaphore

  {

  public:

    // Creates a binary semaphore.  The semaphore is initially in the

    // unsignaled state. 

    semaphore();

    // Destroy the semaphore.

    ~semaphore();

    // Signal the semaphore.  If there are processes blocked in

    // "wait", exactly one will be permitted to proceed.

    void signal();

    // Wait until the semaphore is signaled.

    void wait();

  private:

    int sem_set_;

    pid_t pid_;

  };

  // For use in 22_locale/time_get and time_put.

  std::tm test_tm(int sec, int min, int hour, int mday, int mon,

                  int year, int wday, int yday, int isdst);

} // namespace __gnu_test

#endif // _GLIBCXX_TESTSUITE_HOOKS_H