__debug_alloc< _Alloc > Class Template Reference

#include <_alloc.h>

Inheritance diagram for __debug_alloc< _Alloc >:

Collaboration diagram for __debug_alloc< _Alloc >:

Classes
struct	__alloc_header

Public Types
typedef _Alloc	__allocator_type
typedef _Alloc::value_type	value_type

Public Member Functions
	__debug_alloc ()
	~__debug_alloc ()

Static Public Member Functions
static void *_STLP_CALL	allocate (size_t)
static void _STLP_CALL	deallocate (void *, size_t)

Private Types
enum	{ __pad = 8 , __magic = 0xdeba , __deleted_magic = 0xdebd , __shred_byte = _STLP_SHRED_BYTE }
enum	{ __extra_before = 16 , __extra_after = 8 }

Static Private Member Functions
static size_t _STLP_CALL	__extra_before_chunk ()
static size_t _STLP_CALL	__extra_after_chunk ()

Detailed Description

template<class _Alloc>
class __debug_alloc< _Alloc >

Definition at line 104 of file _alloc.h.

Member Typedef Documentation

__allocator_type

template<class _Alloc >

typedef _Alloc __debug_alloc< _Alloc >::__allocator_type

Definition at line 106 of file _alloc.h.

value_type

template<class _Alloc >

typedef _Alloc::value_type __debug_alloc< _Alloc >::value_type

Definition at line 107 of file _alloc.h.

Member Enumeration Documentation

anonymous enum

template<class _Alloc >

anonymous enum

private

Enumerator
__pad
__magic
__deleted_magic
__shred_byte

Definition at line 115 of file _alloc.h.

       { __pad = 8, __magic = 0xdeba, __deleted_magic = 0xdebd,
         __shred_byte = _STLP_SHRED_BYTE };

anonymous enum

template<class _Alloc >

anonymous enum

private

Enumerator
__extra_before
__extra_after

Definition at line 118 of file _alloc.h.

{ __extra_before = 16, __extra_after = 8 };

Constructor & Destructor Documentation

__debug_alloc()

template<class _Alloc >

__debug_alloc< _Alloc >::__debug_alloc ( )

inline

Definition at line 131 of file _alloc.h.

{}

~__debug_alloc()

template<class _Alloc >

__debug_alloc< _Alloc >::~__debug_alloc ( )

inline

Definition at line 132 of file _alloc.h.

{}

Member Function Documentation

__extra_after_chunk()

template<class _Alloc >

static size_t _STLP_CALL __debug_alloc< _Alloc >::__extra_after_chunk ( )

inlinestaticprivate

Definition at line 126 of file _alloc.h.

                                                 {
    return (long)__extra_after / sizeof(value_type) +
      (size_t)((long)__extra_after % sizeof(value_type) > 0);
  }

__extra_before_chunk()

template<class _Alloc >

static size_t _STLP_CALL __debug_alloc< _Alloc >::__extra_before_chunk ( )

inlinestaticprivate

Definition at line 122 of file _alloc.h.

                                                  {
    return (long)__extra_before / sizeof(value_type) +
      (size_t)((long)__extra_before % sizeof(value_type) > 0);
  }

allocate()

template<class _Alloc >

_STLP_BEGIN_NAMESPACE void *_STLP_CALL __debug_alloc< _Alloc >::allocate ( size_t  __n )

static

Definition at line 38 of file _alloc.c.

                                                            {
  size_t __total_extra = __extra_before_chunk() + __extra_after_chunk();
  size_t __real_n = __n + __total_extra;
  if (__real_n < __n) {
    //It means that we rolled on size_t, __n must be very large:
    _STLP_THROW_BAD_ALLOC;
  }
  __alloc_header *__result = (__alloc_header *)__allocator_type::allocate(__real_n);
  memset((char*)__result, __shred_byte, __real_n * sizeof(value_type));
  __result->__magic = __magic;
  __result->__type_size = sizeof(value_type);
  __result->_M_size = (_STLP_UINT32_T)__n;
  return ((char*)__result) + (long)__extra_before;
}

deallocate()

template<class _Alloc >

void _STLP_CALL __debug_alloc< _Alloc >::deallocate ( void *  __p, size_t  __n  )

static

Definition at line 55 of file _alloc.c.

                                                       {
  __alloc_header * __real_p = (__alloc_header*)((char *)__p -(long)__extra_before);
  // check integrity
  _STLP_VERBOSE_ASSERT(__real_p->__magic != __deleted_magic, _StlMsg_DBA_DELETED_TWICE)
  _STLP_VERBOSE_ASSERT(__real_p->__magic == __magic, _StlMsg_DBA_NEVER_ALLOCATED)
  _STLP_VERBOSE_ASSERT(__real_p->__type_size == 1,_StlMsg_DBA_TYPE_MISMATCH)
  _STLP_VERBOSE_ASSERT(__real_p->_M_size == __n, _StlMsg_DBA_SIZE_MISMATCH)
  // check pads on both sides
  unsigned char* __tmp;
  for (__tmp = (unsigned char*)(__real_p + 1); __tmp < (unsigned char*)__p; ++__tmp) {
    _STLP_VERBOSE_ASSERT(*__tmp == __shred_byte, _StlMsg_DBA_UNDERRUN)
  }
 
  size_t __real_n = __n + __extra_before_chunk() + __extra_after_chunk();
 
  for (__tmp= ((unsigned char*)__p) + __n * sizeof(value_type);
       __tmp < ((unsigned char*)__real_p) + __real_n ; ++__tmp) {
    _STLP_VERBOSE_ASSERT(*__tmp == __shred_byte, _StlMsg_DBA_OVERRUN)
  }
 
  // that may be unfortunate, just in case
  __real_p->__magic = __deleted_magic;
  memset((char*)__p, __shred_byte, __n * sizeof(value_type));
  __allocator_type::deallocate(__real_p, __real_n);
}

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The documentation for this class was generated from the following files:

• sdk/include/c++/stlport/stl/_alloc.h
• sdk/include/c++/stlport/stl/_alloc.c