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 licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_MEMORYH__
  13 #define _WX_MEMORYH__
  14
  15 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  16 #pragma interface "memory.h"
  17 #endif
  18
  19 #include "wx/defs.h"
  20 #include "wx/string.h"
  21 #include "wx/msgout.h"
  22
  23 /*
  24   The macro which will be expanded to include the file and line number
  25   info, or to be a straight call to the new operator.
  26 */
  27
  28 #if (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
  29
  30 #include <stddef.h>
  31
  32 #ifdef __WXDEBUG__
  33
  34 WXDLLIMPEXP_BASE void * wxDebugAlloc(size_t size, wxChar * fileName, int lineNum, bool isObject, bool isVect = false);
  35 WXDLLIMPEXP_BASE void wxDebugFree(void * buf, bool isVect = false);
  36
  37 //**********************************************************************************
  38 /*
  39   The global operator new used for everything apart from getting
  40   dynamic storage within this function itself.
  41 */
  42
  43 // We'll only do malloc and free for the moment: leave the interesting
  44 // stuff for the wxObject versions.
  45 // devik 2000-8-29: All new/delete ops are now inline because they can't
  46 // be marked as dllexport/dllimport. It then leads to weird bugs when
  47 // used on MSW as DLL
  48
  49 #if wxUSE_GLOBAL_MEMORY_OPERATORS
  50
  51 // Undefine temporarily (new is #defined in object.h) because we want to
  52 // declare some new operators.
  53 #ifdef new
  54     #undef new
  55 #endif
  56
  57 #if defined(__SUNCC__)
  58     #define wxUSE_ARRAY_MEMORY_OPERATORS 0
  59 #elif !( defined (__VISUALC__) && (__VISUALC__ <= 1020) ) || defined( __MWERKS__)
  60     #define wxUSE_ARRAY_MEMORY_OPERATORS 1
  61 #elif defined (__SGI_CC_)
  62     // only supported by -n32 compilers
  63     #ifndef __EDG_ABI_COMPATIBILITY_VERSION
  64         #define wxUSE_ARRAY_MEMORY_OPERATORS 0
  65     #endif
  66 #elif !( defined (__VISUALC__) && (__VISUALC__ <= 1020) ) || defined( __MWERKS__)
  67     #define wxUSE_ARRAY_MEMORY_OPERATORS 1
  68 #else
  69     // ::operator new[] is a recent C++ feature, so assume it's not supported
  70     #define wxUSE_ARRAY_MEMORY_OPERATORS 0
  71 #endif
  72
  73 inline void * operator new (size_t size, wxChar * fileName, int lineNum)
  74 {
  75     return wxDebugAlloc(size, fileName, lineNum, false, false);
  76 }
  77
  78 inline void * operator new (size_t size)
  79 {
  80     return wxDebugAlloc(size, NULL, 0, false);
  81 }
  82
  83 inline void operator delete (void * buf)
  84 {
  85     wxDebugFree(buf, false);
  86 }
  87
  88 #if wxUSE_ARRAY_MEMORY_OPERATORS
  89 inline void * operator new[] (size_t size)
  90 {
  91     return wxDebugAlloc(size, NULL, 0, false, true);
  92 }
  93
  94 inline void * operator new[] (size_t size, wxChar * fileName, int lineNum)
  95 {
  96     return wxDebugAlloc(size, fileName, lineNum, false, true);
  97 }
  98
  99 inline void operator delete[] (void * buf)
 100 {
 101   wxDebugFree(buf, true);
 102 }
 103 #endif
 104
 105 // VC++ 6.0 and MWERKS
 106 #if ( defined(__VISUALC__) && (__VISUALC__ >= 1200) ) || defined(__MWERKS__)
 107 inline void operator delete(void* pData, wxChar* /* fileName */, int /* lineNum */)
 108 {
 109     wxDebugFree(pData, false);
 110 }
 111 inline void operator delete[](void* pData, wxChar* /* fileName */, int /* lineNum */)
 112 {
 113     wxDebugFree(pData, true);
 114 }
 115 #endif // __VISUALC__>=1200
 116 #endif // wxUSE_GLOBAL_MEMORY_OPERATORS
 117 #endif // __WXDEBUG__
 118
 119 //**********************************************************************************
 120
 121 typedef unsigned int wxMarkerType;
 122
 123 /*
 124   Define the struct which will be placed at the start of all dynamically
 125   allocated memory.
 126 */
 127
 128 class WXDLLIMPEXP_BASE wxMemStruct {
 129
 130 friend class WXDLLIMPEXP_BASE wxDebugContext; // access to the m_next pointer for list traversal.
 131
 132 public:
 133 public:
 134     int AssertList ();
 135
 136     size_t RequestSize () { return m_reqSize; }
 137     wxMarkerType Marker () { return m_firstMarker; }
 138
 139     // When an object is deleted we set the id slot to a specific value.
 140     inline void SetDeleted ();
 141     inline int IsDeleted ();
 142
 143     int Append ();
 144     int Unlink ();
 145
 146     // Used to determine if the object is really a wxMemStruct.
 147     // Not a foolproof test by any means, but better than none I hope!
 148     int AssertIt ();
 149
 150     // Do all validation on a node.
 151     int ValidateNode ();
 152
 153     // Check the integrity of a node and of the list, node by node.
 154     int CheckBlock ();
 155     int CheckAllPrevious ();
 156
 157     // Print a single node.
 158     void PrintNode ();
 159
 160     // Called when the memory linking functions get an error.
 161     void ErrorMsg (const char *);
 162     void ErrorMsg ();
 163
 164     inline void *GetActualData(void) const { return m_actualData; }
 165
 166     void Dump(void);
 167
 168 public:
 169     // Check for underwriting. There are 2 of these checks. This one
 170     // inside the struct and another right after the struct.
 171     wxMarkerType        m_firstMarker;
 172
 173     // File name and line number are from cpp.
 174     wxChar*             m_fileName;
 175     int                 m_lineNum;
 176
 177     // The amount of memory requested by the caller.
 178     size_t              m_reqSize;
 179
 180     // Used to try to verify that we really are dealing with an object
 181     // of the required class. Can be 1 of 2 values these indicating a valid
 182     // wxMemStruct object, or a deleted wxMemStruct object.
 183     wxMarkerType        m_id;
 184
 185     wxMemStruct *       m_prev;
 186     wxMemStruct *       m_next;
 187
 188     void *              m_actualData;
 189     bool                m_isObject;
 190 };
 191
 192
 193 typedef void (wxMemStruct::*PmSFV) ();
 194
 195
 196 /*
 197   Debugging class. This will only have a single instance, but it's
 198   a reasonable way to keep everything together and to make this
 199   available for change if needed by someone else.
 200   A lot of this stuff would be better off within the wxMemStruct class, but
 201   it's stuff which we need to access at times when there is no wxMemStruct
 202   object so we use this class instead. Think of it as a collection of
 203   globals which have to do with the wxMemStruct class.
 204 */
 205
 206 class WXDLLIMPEXP_BASE wxDebugContext {
 207
 208 protected:
 209     // Used to set alignment for markers.
 210     static size_t CalcAlignment ();
 211
 212     // Returns the amount of padding needed after something of the given
 213     // size. This is so that when we cast pointers backwards and forwards
 214     // the pointer value will be valid for a wxMarkerType.
 215     static size_t GetPadding (const size_t size) ;
 216
 217     // Traverse the list.
 218     static void TraverseList (PmSFV, wxMemStruct *from = NULL);
 219
 220     static int debugLevel;
 221     static bool debugOn;
 222
 223     static int m_balign;            // byte alignment
 224     static int m_balignmask;        // mask for performing byte alignment
 225 public:
 226     // Set a checkpoint to dump only the memory from
 227     // a given point
 228     static wxMemStruct *checkPoint;
 229
 230     wxDebugContext(void);
 231     ~wxDebugContext(void);
 232
 233     static int GetLevel(void) { return debugLevel; }
 234     static void SetLevel(int level) { debugLevel = level; }
 235
 236     static bool GetDebugMode(void) { return debugOn; }
 237     static void SetDebugMode(bool flag) { debugOn = flag; }
 238
 239     static void SetCheckpoint(bool all = false);
 240     static wxMemStruct *GetCheckpoint(void) { return checkPoint; }
 241
 242     // Calculated from the request size and any padding needed
 243     // before the final marker.
 244     static size_t PaddedSize (const size_t reqSize);
 245
 246     // Calc the total amount of space we need from the system
 247     // to satisfy a caller request. This includes all padding.
 248     static size_t TotSize (const size_t reqSize);
 249
 250     // Return valid pointers to offsets within the allocated memory.
 251     static char * StructPos (const char * buf);
 252     static char * MidMarkerPos (const char * buf);
 253     static char * CallerMemPos (const char * buf);
 254     static char * EndMarkerPos (const char * buf, const size_t size);
 255
 256     // Given a pointer to the start of the caller requested area
 257     // return a pointer to the start of the entire alloc\'d buffer.
 258     static char * StartPos (const char * caller);
 259
 260     // Access to the list.
 261     static wxMemStruct * GetHead () { return m_head; }
 262     static wxMemStruct * GetTail () { return m_tail; }
 263
 264     // Set the list sentinals.
 265     static wxMemStruct * SetHead (wxMemStruct * st) { return (m_head = st); }
 266     static wxMemStruct * SetTail (wxMemStruct * st) { return (m_tail = st); }
 267
 268     // If this is set then every new operation checks the validity
 269     // of the all previous nodes in the list.
 270     static bool GetCheckPrevious () { return m_checkPrevious; }
 271     static void SetCheckPrevious (bool value) { m_checkPrevious = value; }
 272
 273     // Checks all nodes, or all nodes if checkAll is true
 274     static int Check(bool checkAll = false);
 275
 276     // Print out the list of wxMemStruct nodes.
 277     static bool PrintList(void);
 278
 279     // Dump objects
 280     static bool Dump(void);
 281
 282     // Print statistics
 283     static bool PrintStatistics(bool detailed = true);
 284
 285     // Print out the classes in the application.
 286     static bool PrintClasses(void);
 287
 288     // Count the number of non-wxDebugContext-related objects
 289     // that are outstanding
 290     static int CountObjectsLeft(bool sinceCheckpoint = false);
 291
 292     // This function is used to output the dump
 293     static void OutputDumpLine(const wxChar *szFormat, ...);
 294
 295 private:
 296     // Store these here to allow access to the list without
 297     // needing to have a wxMemStruct object.
 298     static wxMemStruct*         m_head;
 299     static wxMemStruct*         m_tail;
 300
 301     // Set to false if we're not checking all previous nodes when
 302     // we do a new. Set to true when we are.
 303     static bool                 m_checkPrevious;
 304 };
 305
 306 // Final cleanup (e.g. deleting the log object and doing memory leak checking)
 307 // will be delayed until all wxDebugContextDumpDelayCounter objects have been
 308 // destructed. Adding one wxDebugContextDumpDelayCounter per file will delay
 309 // memory leak checking until after destructing all global objects.
 310 class WXDLLIMPEXP_BASE wxDebugContextDumpDelayCounter
 311 {
 312 public:
 313     wxDebugContextDumpDelayCounter() {
 314         sm_count++;
 315     }
 316
 317     ~wxDebugContextDumpDelayCounter() {
 318         sm_count--;
 319         if(!sm_count) DoDump();
 320     }
 321 private:
 322     void DoDump();
 323     static int sm_count;
 324 };
 325
 326 // make leak dump after all globals have been destructed
 327 static wxDebugContextDumpDelayCounter wxDebugContextDumpDelayCounter_File;
 328 #define WXDEBUG_DUMPDELAYCOUNTER \
 329     static wxDebugContextDumpDelayCounter wxDebugContextDumpDelayCounter_Extra;
 330
 331 // Output a debug message, in a system dependent fashion.
 332 void WXDLLIMPEXP_BASE wxTrace(const wxChar *fmt ...) ATTRIBUTE_PRINTF_1;
 333 void WXDLLIMPEXP_BASE wxTraceLevel(int level, const wxChar *fmt ...) ATTRIBUTE_PRINTF_2;
 334
 335 #define WXTRACE wxTrace
 336 #define WXTRACELEVEL wxTraceLevel
 337
 338 #else // (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
 339
 340 #define WXDEBUG_DUMPDELAYCOUNTER
 341
 342 // Borland C++ Builder 6 seems to have troubles with inline functions (see bug
 343 // 819700)
 344 #if 0
 345     inline void wxTrace(const wxChar *WXUNUSED(fmt)) {}
 346     inline void wxTraceLevel(int WXUNUSED(level), const wxChar *WXUNUSED(fmt)) {}
 347 #else
 348     #define wxTrace(fmt)
 349     #define wxTraceLevel(l, fmt)
 350 #endif
 351
 352 #define WXTRACE true ? (void)0 : wxTrace
 353 #define WXTRACELEVEL true ? (void)0 : wxTraceLevel
 354
 355 #endif // (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
 356
 357 #endif
 358     // _WX_MEMORYH__
 359