include/wx/memory.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/memory.h
   3 // Purpose:     Memory operations
   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 #include "wx/defs.h"
  16 #include "wx/string.h"
  17 #include "wx/msgout.h"
  18
  19 /*
  20   The macro which will be expanded to include the file and line number
  21   info, or to be a straight call to the new operator.
  22 */
  23
  24 #if (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
  25
  26 #include <stddef.h>
  27
  28 #ifdef __WXDEBUG__
  29
  30 WXDLLIMPEXP_BASE void * wxDebugAlloc(size_t size, wxChar * fileName, int lineNum, bool isObject, bool isVect = false);
  31 WXDLLIMPEXP_BASE void wxDebugFree(void * buf, bool isVect = false);
  32
  33 //**********************************************************************************
  34 /*
  35   The global operator new used for everything apart from getting
  36   dynamic storage within this function itself.
  37 */
  38
  39 // We'll only do malloc and free for the moment: leave the interesting
  40 // stuff for the wxObject versions.
  41
  42
  43 #if wxUSE_GLOBAL_MEMORY_OPERATORS
  44
  45 // Undefine temporarily (new is #defined in object.h) because we want to
  46 // declare some new operators.
  47 #ifdef new
  48     #undef new
  49 #endif
  50
  51 #if defined(__SUNCC__)
  52     #define wxUSE_ARRAY_MEMORY_OPERATORS 0
  53 #elif !( defined (__VISUALC__) && (__VISUALC__ <= 1020) ) || defined( __MWERKS__)
  54     #define wxUSE_ARRAY_MEMORY_OPERATORS 1
  55 #elif defined (__SGI_CC_)
  56     // only supported by -n32 compilers
  57     #ifndef __EDG_ABI_COMPATIBILITY_VERSION
  58         #define wxUSE_ARRAY_MEMORY_OPERATORS 0
  59     #endif
  60 #elif !( defined (__VISUALC__) && (__VISUALC__ <= 1020) ) || defined( __MWERKS__)
  61     #define wxUSE_ARRAY_MEMORY_OPERATORS 1
  62 #else
  63     // ::operator new[] is a recent C++ feature, so assume it's not supported
  64     #define wxUSE_ARRAY_MEMORY_OPERATORS 0
  65 #endif
  66
  67 // devik 2000-8-29: All new/delete ops are now inline because they can't
  68 // be marked as dllexport/dllimport. It then leads to weird bugs when
  69 // used on MSW as DLL
  70 #if defined(__WXMSW__) && (defined(WXUSINGDLL) || defined(WXMAKINGDLL_BASE))
  71 inline void * operator new (size_t size, wxChar * fileName, int lineNum)
  72 {
  73     return wxDebugAlloc(size, fileName, lineNum, false, false);
  74 }
  75
  76 inline void * operator new (size_t size)
  77 {
  78     return wxDebugAlloc(size, NULL, 0, false);
  79 }
  80
  81 inline void operator delete (void * buf)
  82 {
  83     wxDebugFree(buf, false);
  84 }
  85
  86 #if wxUSE_ARRAY_MEMORY_OPERATORS
  87 inline void * operator new[] (size_t size)
  88 {
  89     return wxDebugAlloc(size, NULL, 0, false, true);
  90 }
  91
  92 inline void * operator new[] (size_t size, wxChar * fileName, int lineNum)
  93 {
  94     return wxDebugAlloc(size, fileName, lineNum, false, true);
  95 }
  96
  97 inline void operator delete[] (void * buf)
  98 {
  99     wxDebugFree(buf, true);
 100 }
 101 #endif // wxUSE_ARRAY_MEMORY_OPERATORS
 102
 103 #else
 104
 105 void * operator new (size_t size, wxChar * fileName, int lineNum);
 106
 107 void * operator new (size_t size);
 108
 109 void operator delete (void * buf);
 110
 111 #if wxUSE_ARRAY_MEMORY_OPERATORS
 112 void * operator new[] (size_t size);
 113
 114 void * operator new[] (size_t size, wxChar * fileName, int lineNum);
 115
 116 void operator delete[] (void * buf);
 117 #endif // wxUSE_ARRAY_MEMORY_OPERATORS
 118 #endif // defined(__WXMSW__) && (defined(WXUSINGDLL) || defined(WXMAKINGDLL_BASE))
 119
 120 // VC++ 6.0 and MWERKS
 121 #if ( defined(__VISUALC__) && (__VISUALC__ >= 1200) ) || defined(__MWERKS__)
 122 inline void operator delete(void* pData, wxChar* /* fileName */, int /* lineNum */)
 123 {
 124     wxDebugFree(pData, false);
 125 }
 126 inline void operator delete[](void* pData, wxChar* /* fileName */, int /* lineNum */)
 127 {
 128     wxDebugFree(pData, true);
 129 }
 130 #endif // __VISUALC__>=1200
 131 #endif // wxUSE_GLOBAL_MEMORY_OPERATORS
 132 #endif // __WXDEBUG__
 133
 134 //**********************************************************************************
 135
 136 typedef unsigned int wxMarkerType;
 137
 138 /*
 139   Define the struct which will be placed at the start of all dynamically
 140   allocated memory.
 141 */
 142
 143 class WXDLLIMPEXP_BASE wxMemStruct {
 144
 145 friend class WXDLLIMPEXP_FWD_BASE wxDebugContext; // access to the m_next pointer for list traversal.
 146
 147 public:
 148 public:
 149     int AssertList ();
 150
 151     size_t RequestSize () { return m_reqSize; }
 152     wxMarkerType Marker () { return m_firstMarker; }
 153
 154     // When an object is deleted we set the id slot to a specific value.
 155     inline void SetDeleted ();
 156     inline int IsDeleted ();
 157
 158     int Append ();
 159     int Unlink ();
 160
 161     // Used to determine if the object is really a wxMemStruct.
 162     // Not a foolproof test by any means, but better than none I hope!
 163     int AssertIt ();
 164
 165     // Do all validation on a node.
 166     int ValidateNode ();
 167
 168     // Check the integrity of a node and of the list, node by node.
 169     int CheckBlock ();
 170     int CheckAllPrevious ();
 171
 172     // Print a single node.
 173     void PrintNode ();
 174
 175     // Called when the memory linking functions get an error.
 176     void ErrorMsg (const char *);
 177     void ErrorMsg ();
 178
 179     inline void *GetActualData(void) const { return m_actualData; }
 180
 181     void Dump(void);
 182
 183 public:
 184     // Check for underwriting. There are 2 of these checks. This one
 185     // inside the struct and another right after the struct.
 186     wxMarkerType        m_firstMarker;
 187
 188     // File name and line number are from cpp.
 189     wxChar*             m_fileName;
 190     int                 m_lineNum;
 191
 192     // The amount of memory requested by the caller.
 193     size_t              m_reqSize;
 194
 195     // Used to try to verify that we really are dealing with an object
 196     // of the required class. Can be 1 of 2 values these indicating a valid
 197     // wxMemStruct object, or a deleted wxMemStruct object.
 198     wxMarkerType        m_id;
 199
 200     wxMemStruct *       m_prev;
 201     wxMemStruct *       m_next;
 202
 203     void *              m_actualData;
 204     bool                m_isObject;
 205 };
 206
 207
 208 typedef void (wxMemStruct::*PmSFV) ();
 209
 210 // Type of the app function that can be installed and called at wxWidgets shutdown
 211 // (after all other registered files with global destructors have been closed down).
 212 typedef void (*wxShutdownNotifyFunction)();
 213
 214 /*
 215   Debugging class. This will only have a single instance, but it's
 216   a reasonable way to keep everything together and to make this
 217   available for change if needed by someone else.
 218   A lot of this stuff would be better off within the wxMemStruct class, but
 219   it's stuff which we need to access at times when there is no wxMemStruct
 220   object so we use this class instead. Think of it as a collection of
 221   globals which have to do with the wxMemStruct class.
 222 */
 223
 224 class WXDLLIMPEXP_BASE wxDebugContext {
 225
 226 protected:
 227     // Used to set alignment for markers.
 228     static size_t CalcAlignment ();
 229
 230     // Returns the amount of padding needed after something of the given
 231     // size. This is so that when we cast pointers backwards and forwards
 232     // the pointer value will be valid for a wxMarkerType.
 233     static size_t GetPadding (const size_t size) ;
 234
 235     // Traverse the list.
 236     static void TraverseList (PmSFV, wxMemStruct *from = NULL);
 237
 238     static int debugLevel;
 239     static bool debugOn;
 240
 241     static int m_balign;            // byte alignment
 242     static int m_balignmask;        // mask for performing byte alignment
 243 public:
 244     // Set a checkpoint to dump only the memory from
 245     // a given point
 246     static wxMemStruct *checkPoint;
 247
 248     wxDebugContext(void);
 249     ~wxDebugContext(void);
 250
 251     static int GetLevel(void) { return debugLevel; }
 252     static void SetLevel(int level) { debugLevel = level; }
 253
 254     static bool GetDebugMode(void) { return debugOn; }
 255     static void SetDebugMode(bool flag) { debugOn = flag; }
 256
 257     static void SetCheckpoint(bool all = false);
 258     static wxMemStruct *GetCheckpoint(void) { return checkPoint; }
 259
 260     // Calculated from the request size and any padding needed
 261     // before the final marker.
 262     static size_t PaddedSize (const size_t reqSize);
 263
 264     // Calc the total amount of space we need from the system
 265     // to satisfy a caller request. This includes all padding.
 266     static size_t TotSize (const size_t reqSize);
 267
 268     // Return valid pointers to offsets within the allocated memory.
 269     static char * StructPos (const char * buf);
 270     static char * MidMarkerPos (const char * buf);
 271     static char * CallerMemPos (const char * buf);
 272     static char * EndMarkerPos (const char * buf, const size_t size);
 273
 274     // Given a pointer to the start of the caller requested area
 275     // return a pointer to the start of the entire alloc\'d buffer.
 276     static char * StartPos (const char * caller);
 277
 278     // Access to the list.
 279     static wxMemStruct * GetHead () { return m_head; }
 280     static wxMemStruct * GetTail () { return m_tail; }
 281
 282     // Set the list sentinals.
 283     static wxMemStruct * SetHead (wxMemStruct * st) { return (m_head = st); }
 284     static wxMemStruct * SetTail (wxMemStruct * st) { return (m_tail = st); }
 285
 286     // If this is set then every new operation checks the validity
 287     // of the all previous nodes in the list.
 288     static bool GetCheckPrevious () { return m_checkPrevious; }
 289     static void SetCheckPrevious (bool value) { m_checkPrevious = value; }
 290
 291     // Checks all nodes, or all nodes if checkAll is true
 292     static int Check(bool checkAll = false);
 293
 294     // Print out the list of wxMemStruct nodes.
 295     static bool PrintList(void);
 296
 297     // Dump objects
 298     static bool Dump(void);
 299
 300     // Print statistics
 301     static bool PrintStatistics(bool detailed = true);
 302
 303     // Print out the classes in the application.
 304     static bool PrintClasses(void);
 305
 306     // Count the number of non-wxDebugContext-related objects
 307     // that are outstanding
 308     static int CountObjectsLeft(bool sinceCheckpoint = false);
 309
 310     // This function is used to output the dump
 311     static void OutputDumpLine(const wxChar *szFormat, ...);
 312
 313     static void SetShutdownNotifyFunction(wxShutdownNotifyFunction shutdownFn);
 314
 315 private:
 316     // Store these here to allow access to the list without
 317     // needing to have a wxMemStruct object.
 318     static wxMemStruct*         m_head;
 319     static wxMemStruct*         m_tail;
 320
 321     // Set to false if we're not checking all previous nodes when
 322     // we do a new. Set to true when we are.
 323     static bool                 m_checkPrevious;
 324
 325     // Holds a pointer to an optional application function to call at shutdown.
 326     static wxShutdownNotifyFunction sm_shutdownFn;
 327
 328     // Have to access our shutdown hook
 329     friend class wxDebugContextDumpDelayCounter;
 330 };
 331
 332 // Final cleanup (e.g. deleting the log object and doing memory leak checking)
 333 // will be delayed until all wxDebugContextDumpDelayCounter objects have been
 334 // destructed. Adding one wxDebugContextDumpDelayCounter per file will delay
 335 // memory leak checking until after destructing all global objects.
 336
 337 class WXDLLIMPEXP_BASE wxDebugContextDumpDelayCounter
 338 {
 339 public:
 340     wxDebugContextDumpDelayCounter();
 341     ~wxDebugContextDumpDelayCounter();
 342
 343 private:
 344     void DoDump();
 345     static int sm_count;
 346 };
 347
 348 // make leak dump after all globals have been destructed
 349 static wxDebugContextDumpDelayCounter wxDebugContextDumpDelayCounter_File;
 350 #define WXDEBUG_DUMPDELAYCOUNTER \
 351     static wxDebugContextDumpDelayCounter wxDebugContextDumpDelayCounter_Extra;
 352
 353 // Output a debug message, in a system dependent fashion.
 354 void WXDLLIMPEXP_BASE wxTrace(const wxChar *fmt ...) WX_ATTRIBUTE_PRINTF_1;
 355 void WXDLLIMPEXP_BASE wxTraceLevel(int level, const wxChar *fmt ...) WX_ATTRIBUTE_PRINTF_2;
 356
 357 #define WXTRACE wxTrace
 358 #define WXTRACELEVEL wxTraceLevel
 359
 360 #else // (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
 361
 362 #define WXDEBUG_DUMPDELAYCOUNTER
 363
 364 // Borland C++ Builder 6 seems to have troubles with inline functions (see bug
 365 // 819700)
 366 #if 0
 367     inline void wxTrace(const wxChar *WXUNUSED(fmt)) {}
 368     inline void wxTraceLevel(int WXUNUSED(level), const wxChar *WXUNUSED(fmt)) {}
 369 #else
 370     #define wxTrace(fmt)
 371     #define wxTraceLevel(l, fmt)
 372 #endif
 373
 374 #define WXTRACE true ? (void)0 : wxTrace
 375 #define WXTRACELEVEL true ? (void)0 : wxTraceLevel
 376
 377 #endif // (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
 378
 379 #endif
 380     // _WX_MEMORYH__