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// Debugging mode support code -*- C++ -*-

// Copyright (C) 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.

// 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/>.

#include <debug/debug.h>

#include <debug/safe_sequence.h>

#include <debug/safe_iterator.h>

#include <algorithm>

#include <cassert>

#include <cstring>

#include <cctype>

#include <cstdio>

#include <cstdlib>

using namespace std;

namespace

{

  __gnu_cxx::__mutex&

  get_safe_base_mutex()

  {

    static __gnu_cxx::__mutex safe_base_mutex;

    return safe_base_mutex;

  }

} // anonymous namespace

namespace __gnu_debug

{

  const char* _S_debug_messages[] =

  {

    "function requires a valid iterator range [%1.name;, %2.name;)",

    "attempt to insert into container with a singular iterator",

    "attempt to insert into container with an iterator"

    " from a different container",

    "attempt to erase from container with a %2.state; iterator",

    "attempt to erase from container with an iterator"

    " from a different container",

    "attempt to subscript container with out-of-bounds index %2;,"

    " but container only holds %3; elements",

    "attempt to access an element in an empty container",

    "elements in iterator range [%1.name;, %2.name;)"

    " are not partitioned by the value %3;",

    "elements in iterator range [%1.name;, %2.name;)"

    " are not partitioned by the predicate %3; and value %4;",

    "elements in iterator range [%1.name;, %2.name;) are not sorted",

    "elements in iterator range [%1.name;, %2.name;)"

    " are not sorted according to the predicate %3;",

    "elements in iterator range [%1.name;, %2.name;) do not form a heap",

    "elements in iterator range [%1.name;, %2.name;)"

    " do not form a heap with respect to the predicate %3;",

    "attempt to write through a singular bitset reference",

    "attempt to read from a singular bitset reference",

    "attempt to flip a singular bitset reference",

    "attempt to splice a list into itself",

    "attempt to splice lists with inequal allocators",

    "attempt to splice elements referenced by a %1.state; iterator",

    "attempt to splice an iterator from a different container",

    "splice destination %1.name;"

    " occurs within source range [%2.name;, %3.name;)",

    "attempt to initialize an iterator that will immediately become singular",

    "attempt to copy-construct an iterator from a singular iterator",

    "attempt to construct a constant iterator"

    " from a singular mutable iterator",

    "attempt to copy from a singular iterator",

    "attempt to dereference a %1.state; iterator",

    "attempt to increment a %1.state; iterator",

    "attempt to decrement a %1.state; iterator",

    "attempt to subscript a %1.state; iterator %2; step from"

    " its current position, which falls outside its dereferenceable range",

    "attempt to advance a %1.state; iterator %2; steps,"

    " which falls outside its valid range",

    "attempt to retreat a %1.state; iterator %2; steps,"

    " which falls outside its valid range",

    "attempt to compare a %1.state; iterator to a %2.state; iterator",

    "attempt to compare iterators from different sequences",

    "attempt to order a %1.state; iterator to a %2.state; iterator",

    "attempt to order iterators from different sequences",

    "attempt to compute the difference between a %1.state;"

    " iterator to a %2.state; iterator",

    "attempt to compute the different between two iterators"

    " from different sequences",

    "attempt to dereference an end-of-stream istream_iterator",

    "attempt to increment an end-of-stream istream_iterator",

    "attempt to output via an ostream_iterator with no associated stream",

    "attempt to dereference an end-of-stream istreambuf_iterator"

    " (this is a GNU extension)",

    "attempt to increment an end-of-stream istreambuf_iterator"

  };

  void

  _Safe_sequence_base::

  _M_detach_all()

  {

    __gnu_cxx::__scoped_lock sentry(_M_get_mutex());

    for (_Safe_iterator_base* __iter = _M_iterators; __iter;)

      {

        _Safe_iterator_base* __old = __iter;

        __iter = __iter->_M_next;

        __old->_M_detach_single();

      }

    for (_Safe_iterator_base* __iter2 = _M_const_iterators; __iter2;)

      {

        _Safe_iterator_base* __old = __iter2;

        __iter2 = __iter2->_M_next;

        __old->_M_detach_single();

      }

  }

  void

  _Safe_sequence_base::

  _M_detach_singular()

  {

    __gnu_cxx::__scoped_lock sentry(_M_get_mutex());

    for (_Safe_iterator_base* __iter = _M_iterators; __iter;)

      {

        _Safe_iterator_base* __old = __iter;

        __iter = __iter->_M_next;

        if (__old->_M_singular())

          __old->_M_detach_single();

      }

    for (_Safe_iterator_base* __iter2 = _M_const_iterators; __iter2;)

      {

        _Safe_iterator_base* __old = __iter2;

        __iter2 = __iter2->_M_next;

        if (__old->_M_singular())

          __old->_M_detach_single();

      }

  }

  void

  _Safe_sequence_base::

  _M_revalidate_singular()

  {

    __gnu_cxx::__scoped_lock sentry(_M_get_mutex());

    for (_Safe_iterator_base* __iter = _M_iterators; __iter;

         __iter = __iter->_M_next)

      __iter->_M_version = _M_version;

    for (_Safe_iterator_base* __iter2 = _M_const_iterators; __iter2;

         __iter2 = __iter2->_M_next)

      __iter2->_M_version = _M_version;

  }

  void

  _Safe_sequence_base::

  _M_swap(_Safe_sequence_base& __x)

  {

    __gnu_cxx::__scoped_lock sentry(_M_get_mutex());

    swap(_M_iterators, __x._M_iterators);

    swap(_M_const_iterators, __x._M_const_iterators);

    swap(_M_version, __x._M_version);

    _Safe_iterator_base* __iter;

    for (__iter = _M_iterators; __iter; __iter = __iter->_M_next)

      __iter->_M_sequence = this;

    for (__iter = __x._M_iterators; __iter; __iter = __iter->_M_next)

      __iter->_M_sequence = &__x;

    for (__iter = _M_const_iterators; __iter; __iter = __iter->_M_next)

      __iter->_M_sequence = this;

    for (__iter = __x._M_const_iterators; __iter; __iter = __iter->_M_next)

      __iter->_M_sequence = &__x;

  }

  __gnu_cxx::__mutex&

  _Safe_sequence_base::

  _M_get_mutex() throw ()

  { return get_safe_base_mutex(); }

  void

  _Safe_iterator_base::

  _M_attach(_Safe_sequence_base* __seq, bool __constant)

  {

    __gnu_cxx::__scoped_lock sentry(_M_get_mutex());

    _M_attach_single(__seq, __constant);

  }

  void

  _Safe_iterator_base::

  _M_attach_single(_Safe_sequence_base* __seq, bool __constant) throw ()

  {

    _M_detach_single();

    // Attach to the new sequence (if there is one)

    if (__seq)

      {

        _M_sequence = __seq;

        _M_version = _M_sequence->_M_version;

        _M_prior = 0;

        if (__constant)

          {

            _M_next = _M_sequence->_M_const_iterators;

            if (_M_next)

              _M_next->_M_prior = this;

            _M_sequence->_M_const_iterators = this;

          }

        else

          {

            _M_next = _M_sequence->_M_iterators;

            if (_M_next)

              _M_next->_M_prior = this;

            _M_sequence->_M_iterators = this;

          }

      }

  }

  void

  _Safe_iterator_base::

  _M_detach()

  {

    __gnu_cxx::__scoped_lock sentry(_M_get_mutex());

    _M_detach_single();

  }

  void

  _Safe_iterator_base::

  _M_detach_single() throw ()

  {

    if (_M_sequence)

      {

        // Remove us from this sequence's list

        if (_M_prior)

          _M_prior->_M_next = _M_next;

        if (_M_next)

          _M_next->_M_prior = _M_prior;

        if (_M_sequence->_M_const_iterators == this)

          _M_sequence->_M_const_iterators = _M_next;

        if (_M_sequence->_M_iterators == this)

          _M_sequence->_M_iterators = _M_next;

      }

    _M_sequence = 0;

    _M_version = 0;

    _M_prior = 0;

    _M_next = 0;

  }

  bool

  _Safe_iterator_base::

  _M_singular() const throw ()

  { return !_M_sequence || _M_version != _M_sequence->_M_version; }

  bool

  _Safe_iterator_base::

  _M_can_compare(const _Safe_iterator_base& __x) const throw ()

  {

    return (!_M_singular()

            && !__x._M_singular() && _M_sequence == __x._M_sequence);

  }

  __gnu_cxx::__mutex&

  _Safe_iterator_base::

  _M_get_mutex() throw ()

  { return get_safe_base_mutex(); }

  void

  _Error_formatter::_Parameter::

  _M_print_field(const _Error_formatter* __formatter, const char* __name) const

  {

    assert(this->_M_kind != _Parameter::__unused_param);

    const int __bufsize = 64;

    char __buf[__bufsize];

    if (_M_kind == __iterator)

      {

        if (strcmp(__name, "name") == 0)

          {

            assert(_M_variant._M_iterator._M_name);

            __formatter->_M_print_word(_M_variant._M_iterator._M_name);

          }

        else if (strcmp(__name, "address") == 0)

          {

            __formatter->_M_format_word(__buf, __bufsize, "%p",

                                        _M_variant._M_iterator._M_address);

            __formatter->_M_print_word(__buf);

          }

        else if (strcmp(__name, "type") == 0)

          {

            if (!_M_variant._M_iterator._M_type)

              __formatter->_M_print_word("<unknown type>");

            else

              // TBD: demangle!

              __formatter->_M_print_word(_M_variant._M_iterator.

                                         _M_type->name());

          }

        else if (strcmp(__name, "constness") == 0)

          {

            static const char* __constness_names[__last_constness] =

              {

                "<unknown>",

                "constant",

                "mutable"

              };

            __formatter->_M_print_word(__constness_names[_M_variant.

                                                         _M_iterator.

                                                         _M_constness]);

          }

        else if (strcmp(__name, "state") == 0)

          {

            static const char* __state_names[__last_state] =

              {

                "<unknown>",

                "singular",

                "dereferenceable (start-of-sequence)",

                "dereferenceable",

                "past-the-end"

              };

            __formatter->_M_print_word(__state_names[_M_variant.

                                                     _M_iterator._M_state]);

          }

        else if (strcmp(__name, "sequence") == 0)

          {

            assert(_M_variant._M_iterator._M_sequence);

            __formatter->_M_format_word(__buf, __bufsize, "%p",

                                        _M_variant._M_iterator._M_sequence);

            __formatter->_M_print_word(__buf);

          }

        else if (strcmp(__name, "seq_type") == 0)

          {

            if (!_M_variant._M_iterator._M_seq_type)

              __formatter->_M_print_word("<unknown seq_type>");

            else

              // TBD: demangle!

              __formatter->_M_print_word(_M_variant._M_iterator.

                                         _M_seq_type->name());

          }

        else

          assert(false);

      }

    else if (_M_kind == __sequence)

      {

        if (strcmp(__name, "name") == 0)

          {

            assert(_M_variant._M_sequence._M_name);

            __formatter->_M_print_word(_M_variant._M_sequence._M_name);

          }

        else if (strcmp(__name, "address") == 0)

          {

            assert(_M_variant._M_sequence._M_address);

            __formatter->_M_format_word(__buf, __bufsize, "%p",

                                        _M_variant._M_sequence._M_address);

            __formatter->_M_print_word(__buf);

          }

        else if (strcmp(__name, "type") == 0)

          {

            if (!_M_variant._M_sequence._M_type)

              __formatter->_M_print_word("<unknown type>");

            else

              // TBD: demangle!

              __formatter->_M_print_word(_M_variant._M_sequence.

                                         _M_type->name());

          }

        else

          assert(false);

      }

    else if (_M_kind == __integer)

      {

        if (strcmp(__name, "name") == 0)

          {

            assert(_M_variant._M_integer._M_name);

            __formatter->_M_print_word(_M_variant._M_integer._M_name);

          }

        else

        assert(false);

      }

    else if (_M_kind == __string)

      {

        if (strcmp(__name, "name") == 0)

          {

            assert(_M_variant._M_string._M_name);

            __formatter->_M_print_word(_M_variant._M_string._M_name);

          }

        else

          assert(false);

      }

    else

      {

        assert(false);

      }

  }

  void

  _Error_formatter::_Parameter::

  _M_print_description(const _Error_formatter* __formatter) const

  {

    const int __bufsize = 128;

    char __buf[__bufsize];

    if (_M_kind == __iterator)

      {

        __formatter->_M_print_word("iterator ");

        if (_M_variant._M_iterator._M_name)

          {

            __formatter->_M_format_word(__buf, __bufsize, "\"%s\" ",

                                        _M_variant._M_iterator._M_name);

            __formatter->_M_print_word(__buf);

          }

        __formatter->_M_format_word(__buf, __bufsize, "@ 0x%p {\n",

                                    _M_variant._M_iterator._M_address);

        __formatter->_M_print_word(__buf);

        if (_M_variant._M_iterator._M_type)

          {

            __formatter->_M_print_word("type = ");

            _M_print_field(__formatter, "type");

            if (_M_variant._M_iterator._M_constness != __unknown_constness)

              {

                __formatter->_M_print_word(" (");

                _M_print_field(__formatter, "constness");

                __formatter->_M_print_word(" iterator)");

              }

            __formatter->_M_print_word(";\n");

          }

        if (_M_variant._M_iterator._M_state != __unknown_state)

          {

            __formatter->_M_print_word("  state = ");

            _M_print_field(__formatter, "state");

            __formatter->_M_print_word(";\n");

          }

        if (_M_variant._M_iterator._M_sequence)

          {

            __formatter->_M_print_word("  references sequence ");

            if (_M_variant._M_iterator._M_seq_type)

              {

                __formatter->_M_print_word("with type `");

                _M_print_field(__formatter, "seq_type");

                __formatter->_M_print_word("' ");

              }

            __formatter->_M_format_word(__buf, __bufsize, "@ 0x%p\n",

                                        _M_variant._M_sequence._M_address);

            __formatter->_M_print_word(__buf);

          }

        __formatter->_M_print_word("}\n");

      }

    else if (_M_kind == __sequence)

      {

        __formatter->_M_print_word("sequence ");

        if (_M_variant._M_sequence._M_name)

          {

            __formatter->_M_format_word(__buf, __bufsize, "\"%s\" ",

                                        _M_variant._M_sequence._M_name);

            __formatter->_M_print_word(__buf);

          }

        __formatter->_M_format_word(__buf, __bufsize, "@ 0x%p {\n",

                                    _M_variant._M_sequence._M_address);

        __formatter->_M_print_word(__buf);

        if (_M_variant._M_sequence._M_type)

          {

            __formatter->_M_print_word("  type = ");

            _M_print_field(__formatter, "type");

            __formatter->_M_print_word(";\n");

          }

        __formatter->_M_print_word("}\n");

      }

  }

  const _Error_formatter&

  _Error_formatter::_M_message(_Debug_msg_id __id) const throw ()

  { return this->_M_message(_S_debug_messages[__id]); }

  void

  _Error_formatter::_M_error() const

  {

    const int __bufsize = 128;

    char __buf[__bufsize];

    // Emit file & line number information

    _M_column = 1;

    _M_wordwrap = false;

    if (_M_file)

      {

        _M_format_word(__buf, __bufsize, "%s:", _M_file);

        _M_print_word(__buf);

        _M_column += strlen(__buf);

      }

    if (_M_line > 0)

      {

        _M_format_word(__buf, __bufsize, "%u:", _M_line);

        _M_print_word(__buf);

        _M_column += strlen(__buf);

      }

    if (_M_max_length)

      _M_wordwrap = true;

    _M_print_word("error: ");

    // Print the error message

    assert(_M_text);

    _M_print_string(_M_text);

    _M_print_word(".\n");

    // Emit descriptions of the objects involved in the operation

    _M_wordwrap = false;

    bool __has_noninteger_parameters = false;

    for (unsigned int __i = 0; __i < _M_num_parameters; ++__i)

      {

        if (_M_parameters[__i]._M_kind == _Parameter::__iterator

            || _M_parameters[__i]._M_kind == _Parameter::__sequence)

          {

            if (!__has_noninteger_parameters)

              {

                _M_first_line = true;

                _M_print_word("\nObjects involved in the operation:\n");

                __has_noninteger_parameters = true;

              }

            _M_parameters[__i]._M_print_description(this);

          }

      }

    abort();

  }

  template<typename _Tp>

    void

    _Error_formatter::_M_format_word(char* __buf,

                                     int __n __attribute__ ((__unused__)),

                                     const char* __fmt, _Tp __s) const throw ()

    {

#ifdef _GLIBCXX_USE_C99

      std::snprintf(__buf, __n, __fmt, __s);

#else

      std::sprintf(__buf, __fmt, __s);

#endif

    }

  void

  _Error_formatter::_M_print_word(const char* __word) const

  {

    if (!_M_wordwrap)

      {

        fprintf(stderr, "%s", __word);

        return;

      }

    size_t __length = strlen(__word);

    if (__length == 0)

      return;

    if ((_M_column + __length < _M_max_length)

        || (__length >= _M_max_length && _M_column == 1))

      {

        // If this isn't the first line, indent

        if (_M_column == 1 && !_M_first_line)

          {

            char __spacing[_M_indent + 1];

            for (int i = 0; i < _M_indent; ++i)

              __spacing[i] = ' ';

            __spacing[_M_indent] = '\0';

            fprintf(stderr, "%s", __spacing);

            _M_column += _M_indent;

          }

        fprintf(stderr, "%s", __word);

        _M_column += __length;

        if (__word[__length - 1] == '\n')

          {

            _M_first_line = false;

            _M_column = 1;

          }

      }

    else

      {

        _M_column = 1;

        _M_print_word("\n");

        _M_print_word(__word);

      }

  }

  void

  _Error_formatter::

  _M_print_string(const char* __string) const

  {

    const char* __start = __string;

    const char* __finish = __start;

    const int __bufsize = 128;

    char __buf[__bufsize];

    while (*__start)

      {

        if (*__start != '%')

          {

            // [__start, __finish) denotes the next word

            __finish = __start;

            while (isalnum(*__finish))

              ++__finish;

            if (__start == __finish)

              ++__finish;

            if (isspace(*__finish))

              ++__finish;

            const ptrdiff_t __len = __finish - __start;

            assert(__len < __bufsize);

            memcpy(__buf, __start, __len);

            __buf[__len] = '\0';

            _M_print_word(__buf);

            __start = __finish;

            // Skip extra whitespace

            while (*__start == ' ')

              ++__start;

            continue;

          }

        ++__start;

        assert(*__start);

        if (*__start == '%')

          {

            _M_print_word("%");

            ++__start;

            continue;

          }

        // Get the parameter number

        assert(*__start >= '1' && *__start <= '9');

        size_t __param = *__start - '0';

        --__param;

        assert(__param < _M_num_parameters);

        // '.' separates the parameter number from the field

        // name, if there is one.

        ++__start;

        if (*__start != '.')

          {

            assert(*__start == ';');

            ++__start;

            __buf[0] = '\0';

            if (_M_parameters[__param]._M_kind == _Parameter::__integer)

              {

                _M_format_word(__buf, __bufsize, "%ld",

                               _M_parameters[__param]._M_variant._M_integer._M_value);

                _M_print_word(__buf);

              }

            else if (_M_parameters[__param]._M_kind == _Parameter::__string)

              _M_print_string(_M_parameters[__param]._M_variant._M_string._M_value);

            continue;

          }

        // Extract the field name we want

        enum { __max_field_len = 16 };

        char __field[__max_field_len];

        int __field_idx = 0;

        ++__start;

        while (*__start != ';')

          {