include/wx/memory.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        memory.h
   3 // Purpose:     MDI classes
   4 // Author:      Arthur Seaton, Julian Smart
   5 // Modified by:
   6 // Created:     29/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1998 Julian Smart
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_MEMORYH__
  13 #define _WX_MEMORYH__
  14
  15 #ifdef __GNUG__
  16 #pragma interface "memory.h"
  17 #endif
  18
  19 #include "wx/defs.h"
  20 #include "wx/string.h"
  21
  22 /*
  23   The macro which will be expanded to include the file and line number
  24   info, or to be a straight call to the new operator.
  25 */
  26
  27 #if (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
  28
  29 #include <stddef.h>
  30
  31 #if wxUSE_IOSTREAMH
  32 // N.B. BC++ doesn't have istream.h, ostream.h
  33 #  include <iostream.h>
  34 #else
  35 #  include <ostream>
  36 #  ifdef _MSC_VER
  37       using namespace std;
  38 #  endif
  39 #endif
  40
  41 #ifdef __WXDEBUG__
  42
  43 void * wxDebugAlloc(size_t size, char * fileName, int lineNum, bool isObject, bool isVect = FALSE);
  44 void wxDebugFree(void * buf, bool isVect = FALSE);
  45
  46 // Global versions of the new and delete operators.
  47 #if wxUSE_GLOBAL_MEMORY_OPERATORS
  48
  49 // Undefine temporarily (new is #defined in object.h) because we want to
  50 // declare some new operators.
  51 #ifdef new
  52 #undef new
  53 #endif
  54
  55 #if defined(__SUNCC__)
  56 #define wxUSE_ARRAY_MEMORY_OPERATORS 0
  57 #elif !( defined (_MSC_VER) && (_MSC_VER <= 1020) ) || defined( __MWERKS__)
  58 #define wxUSE_ARRAY_MEMORY_OPERATORS 1
  59 #else
  60 #define wxUSE_ARRAY_MEMORY_OPERATORS 0
  61 #endif
  62
  63 // Added JACS 25/11/98: needed for some compilers
  64 void * operator new (size_t size);
  65
  66 #if wxUSE_ARRAY_MEMORY_OPERATORS
  67 void * operator new[] (size_t size);
  68 #endif
  69
  70 void * operator new (size_t size, char * fileName, int lineNum);
  71 void operator delete (void * buf);
  72
  73 #if wxUSE_ARRAY_MEMORY_OPERATORS
  74 void * operator new[] (size_t size, char * fileName, int lineNum);
  75 void operator delete[] (void * buf);
  76 #endif
  77
  78 // VC++ 6.0
  79 #if _MSC_VER >= 1200
  80 void operator delete(void *buf, char*, int);
  81 void operator delete[](void *buf, char*, int);
  82 #endif
  83
  84 #endif
  85   // wxUSE_GLOBAL_MEMORY_OPERATORS
  86 #endif
  87   // __WXDEBUG__
  88
  89 typedef unsigned int wxMarkerType;
  90
  91 /*
  92   Define the struct which will be placed at the start of all dynamically
  93   allocated memory.
  94 */
  95
  96 class WXDLLEXPORT wxMemStruct {
  97
  98 friend class WXDLLEXPORT wxDebugContext; // access to the m_next pointer for list traversal.
  99
 100 public:
 101 public:
 102     int AssertList ();
 103
 104     size_t RequestSize () { return m_reqSize; }
 105     wxMarkerType Marker () { return m_firstMarker; }
 106
 107     // When an object is deleted we set the id slot to a specific value.
 108     inline void SetDeleted ();
 109     inline int IsDeleted ();
 110
 111     int Append ();
 112     int Unlink ();
 113
 114     // Used to determine if the object is really a wxMemStruct.
 115     // Not a foolproof test by any means, but better than none I hope!
 116     int AssertIt ();
 117
 118     // Do all validation on a node.
 119     int ValidateNode ();
 120
 121     // Check the integrity of a node and of the list, node by node.
 122     int CheckBlock ();
 123     int CheckAllPrevious ();
 124
 125     // Print a single node.
 126     void PrintNode ();
 127
 128     // Called when the memory linking functions get an error.
 129     void ErrorMsg (const char *);
 130     void ErrorMsg ();
 131
 132     inline void *GetActualData(void) const { return m_actualData; }
 133
 134     void Dump(void);
 135
 136 public:
 137     // Check for underwriting. There are 2 of these checks. This one
 138     // inside the struct and another right after the struct.
 139     wxMarkerType        m_firstMarker;
 140
 141     // File name and line number are from cpp.
 142     char*               m_fileName;
 143     int                 m_lineNum;
 144
 145     // The amount of memory requested by the caller.
 146     size_t              m_reqSize;
 147
 148     // Used to try to verify that we really are dealing with an object
 149     // of the required class. Can be 1 of 2 values these indicating a valid
 150     // wxMemStruct object, or a deleted wxMemStruct object.
 151     wxMarkerType        m_id;
 152
 153     wxMemStruct *       m_prev;
 154     wxMemStruct *       m_next;
 155
 156     void *              m_actualData;
 157     bool                m_isObject;
 158 };
 159
 160
 161 typedef void (wxMemStruct::*PmSFV) ();
 162
 163
 164 /*
 165   Debugging class. This will only have a single instance, but it\'s
 166   a reasonable way to keep everything together and to make this
 167   available for change if needed by someone else.
 168   A lot of this stuff would be better off within the wxMemStruct class, but
 169   it\'s stuff which we need to access at times when there is no wxMemStruct
 170   object so we use this class instead. Think of it as a collection of
 171   globals which have to do with the wxMemStruct class.
 172 */
 173
 174 class WXDLLEXPORT wxDebugContext {
 175
 176 protected:
 177     // Used to set alignment for markers.
 178     static size_t CalcAlignment ();
 179
 180     // Returns the amount of padding needed after something of the given
 181     // size. This is so that when we cast pointers backwards and forwards
 182     // the pointer value will be valid for a wxMarkerType.
 183     static size_t GetPadding (const size_t size) ;
 184
 185     // Traverse the list.
 186     static void TraverseList (PmSFV, wxMemStruct *from = NULL);
 187
 188     static streambuf *m_streamBuf;
 189     static ostream *m_debugStream;
 190
 191     static int debugLevel;
 192     static bool debugOn;
 193
 194 public:
 195     // Set a checkpoint to dump only the memory from
 196     // a given point
 197     static wxMemStruct *checkPoint;
 198
 199     wxDebugContext(void);
 200     ~wxDebugContext(void);
 201
 202     static bool HasStream(void) { return (m_debugStream != NULL); };
 203     static ostream& GetStream(void) { return *m_debugStream; }
 204     static streambuf *GetStreamBuf(void) { return m_streamBuf; }
 205     static void SetStream(ostream *stream, streambuf *buf = NULL);
 206     static bool SetFile(const wxString& file);
 207     static bool SetStandardError(void);
 208
 209     static int GetLevel(void) { return debugLevel; }
 210     static void SetLevel(int level) { debugLevel = level; }
 211
 212     static bool GetDebugMode(void) { return debugOn; }
 213     static void SetDebugMode(bool flag) { debugOn = flag; }
 214
 215     static void SetCheckpoint(bool all = FALSE);
 216     static wxMemStruct *GetCheckpoint(void) { return checkPoint; }
 217
 218     // Calculated from the request size and any padding needed
 219     // before the final marker.
 220     static size_t PaddedSize (const size_t reqSize);
 221
 222     // Calc the total amount of space we need from the system
 223     // to satisfy a caller request. This includes all padding.
 224     static size_t TotSize (const size_t reqSize);
 225
 226     // Return valid pointers to offsets within the allocated memory.
 227     static char * StructPos (const char * buf);
 228     static char * MidMarkerPos (const char * buf);
 229     static char * CallerMemPos (const char * buf);
 230     static char * EndMarkerPos (const char * buf, const size_t size);
 231
 232     // Given a pointer to the start of the caller requested area
 233     // return a pointer to the start of the entire alloc\'d buffer.
 234     static char * StartPos (const char * caller);
 235
 236     // Access to the list.
 237     static wxMemStruct * GetHead () { return m_head; }
 238     static wxMemStruct * GetTail () { return m_tail; }
 239
 240     // Set the list sentinals.
 241     static wxMemStruct * SetHead (wxMemStruct * st) { return (m_head = st); }
 242     static wxMemStruct * SetTail (wxMemStruct * st) { return (m_tail = st); }
 243
 244     // If this is set then every new operation checks the validity
 245     // of the all previous nodes in the list.
 246     static bool GetCheckPrevious () { return m_checkPrevious; }
 247     static void SetCheckPrevious (bool value) { m_checkPrevious = value; }
 248
 249     // Checks all nodes, or all nodes if checkAll is TRUE
 250     static int Check(bool checkAll = FALSE);
 251
 252     // Print out the list of wxMemStruct nodes.
 253     static bool PrintList(void);
 254
 255     // Dump objects
 256     static bool Dump(void);
 257
 258     // Print statistics
 259     static bool PrintStatistics(bool detailed = TRUE);
 260
 261     // Print out the classes in the application.
 262     static bool PrintClasses(void);
 263
 264     // Count the number of non-wxDebugContext-related objects
 265     // that are outstanding
 266     static int CountObjectsLeft(bool sinceCheckpoint = FALSE);
 267
 268 private:
 269     // Store these here to allow access to the list without
 270     // needing to have a wxMemStruct object.
 271     static wxMemStruct*         m_head;
 272     static wxMemStruct*         m_tail;
 273
 274     // Set to FALSE if we're not checking all previous nodes when
 275     // we do a new. Set to TRUE when we are.
 276     static bool                 m_checkPrevious;
 277 };
 278
 279 // Output a debug message, in a system dependent fashion.
 280 void WXDLLEXPORT wxTrace(const char *fmt ...);
 281 void WXDLLEXPORT wxTraceLevel(int level, const char *fmt ...);
 282
 283 #define WXTRACE wxTrace
 284 #define WXTRACELEVEL wxTraceLevel
 285
 286 #else // else part for the #if __WXDEBUG__
 287
 288 inline void wxTrace(const char *WXUNUSED(fmt)) {}
 289 inline void wxTraceLevel(int WXUNUSED(level), const char *WXUNUSED(fmt)) {}
 290
 291 #define WXTRACE TRUE ? (void)0 : wxTrace
 292 #define WXTRACELEVEL TRUE ? (void)0 : wxTraceLevel
 293 // #define WXDEBUG_NEW new
 294
 295 #endif // __WXDEBUG__
 296
 297 #endif
 298     // _WX_MEMORYH__
 299