src/common/memory.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        memory.cpp
   3 // Purpose:     Memory checking implementation
   4 // Author:      Arthur Seaton, Julian Smart
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart and Markus Holzem
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13 #pragma implementation "memory.h"
  14 #endif
  15
  16 // For compilers that support precompilation, includes "wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #ifdef __BORLANDC__
  20 #pragma hdrstop
  21 #endif
  22
  23 #ifndef WX_PRECOMP
  24 #include "wx/defs.h"
  25 #endif
  26
  27 #if (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
  28
  29 #ifdef __GNUG__
  30 // #pragma implementation
  31 #endif
  32
  33 #ifndef WX_PRECOMP
  34 #include "wx/utils.h"
  35 #include "wx/app.h"
  36 #endif
  37
  38 #include <wx/log.h>
  39 #include <stdlib.h>
  40
  41 #if wxUSE_IOSTREAMH
  42 #include <iostream.h>
  43 #include <fstream.h>
  44 #else
  45 #include <iostream>
  46 #include <fstream>
  47 #  ifdef _MSC_VER
  48       using namespace std;
  49 #  endif
  50 #endif
  51
  52 #if !defined(__WATCOMC__) && !defined(__VMS__)
  53 #include <memory.h>
  54 #endif
  55
  56 #include <stdarg.h>
  57 #include <string.h>
  58
  59 #ifdef __WXMSW__
  60 #include <windows.h>
  61
  62 #ifdef GetClassInfo
  63 #undef GetClassInfo
  64 #endif
  65
  66 #ifdef GetClassName
  67 #undef GetClassName
  68 #endif
  69
  70 #endif
  71
  72 #include "wx/memory.h"
  73
  74 #ifdef new
  75 #undef new
  76 #endif
  77
  78 // wxDebugContext wxTheDebugContext;
  79 /*
  80   Redefine new and delete so that we can pick up situations where:
  81         - we overwrite or underwrite areas of malloc'd memory.
  82         - we use uninitialise variables
  83   Only do this in debug mode.
  84
  85   We change new to get enough memory to allocate a struct, followed
  86   by the caller's requested memory, followed by a tag. The struct
  87   is used to create a doubly linked list of these areas and also
  88   contains another tag. The tags are used to determine when the area
  89   has been over/under written.
  90 */
  91
  92
  93 /*
  94   Values which are used to set the markers which will be tested for
  95   under/over write. There are 3 of these, one in the struct, one
  96   immediately after the struct but before the caller requested memory and
  97   one immediately after the requested memory.
  98 */
  99 #define MemStartCheck  0x23A8
 100 #define MemMidCheck  0xA328
 101 #define MemEndCheck 0x8A32
 102 #define MemFillChar 0xAF
 103 #define MemStructId  0x666D
 104
 105 /*
 106   External interface for the wxMemStruct class. Others are
 107   defined inline within the class def. Here we only need to be able
 108   to add and delete nodes from the list and handle errors in some way.
 109 */
 110
 111 /*
 112   Used for internal "this shouldn't happen" type of errors.
 113 */
 114 void wxMemStruct::ErrorMsg (const char * mesg)
 115 {
 116   wxLogDebug("wxWindows memory checking error: %s", mesg);
 117   PrintNode ();
 118
 119 //       << m_fileName << ' ' << m_lineNum << endl;
 120 }
 121
 122 /*
 123   Used when we find an overwrite or an underwrite error.
 124 */
 125 void wxMemStruct::ErrorMsg ()
 126 {
 127   wxLogDebug("wxWindows over/underwrite memory error:");
 128   PrintNode ();
 129
 130 //    cerr << m_fileName << ' ' << m_lineNum << endl;
 131 }
 132
 133
 134 /*
 135   We want to find out if pointers have been overwritten as soon as is
 136   possible, so test everything before we dereference it. Of course it's still
 137   quite possible that, if things have been overwritten, this function will
 138   fall over, but the only way of dealing with that would cost too much in terms
 139   of time.
 140 */
 141 int wxMemStruct::AssertList ()
 142 {
 143     if (wxDebugContext::GetHead () != 0 && ! (wxDebugContext::GetHead ())->AssertIt () ||
 144         wxDebugContext::GetTail () != 0 && ! wxDebugContext::GetTail ()->AssertIt ()) {
 145         ErrorMsg ("Head or tail pointers trashed");
 146         return 0;
 147     }
 148     return 1;
 149 }
 150
 151
 152 /*
 153   Check that the thing we're pointing to has the correct id for a wxMemStruct
 154   object and also that it's previous and next pointers are pointing at objects
 155   which have valid ids.
 156   This is definitely not perfect since we could fall over just trying to access
 157   any of the slots which we use here, but I think it's about the best that I
 158   can do without doing something like taking all new wxMemStruct pointers and
 159   comparing them against all known pointer within the list and then only
 160   doing this sort of check _after_ you've found the pointer in the list. That
 161   would be safer, but also much more time consuming.
 162 */
 163 int wxMemStruct::AssertIt ()
 164 {
 165     return (m_id == MemStructId &&
 166             (m_prev == 0 || m_prev->m_id == MemStructId) &&
 167             (m_next == 0 || m_next->m_id == MemStructId));
 168 }
 169
 170
 171 /*
 172   Additions are always at the tail of the list.
 173   Returns 0 on error, non-zero on success.
 174 */
 175 int wxMemStruct::Append ()
 176 {
 177     if (! AssertList ())
 178         return 0;
 179
 180     if (wxDebugContext::GetHead () == 0) {
 181         if (wxDebugContext::GetTail () != 0) {
 182             ErrorMsg ("Null list should have a null tail pointer");
 183             return 0;
 184         }
 185         (void) wxDebugContext::SetHead (this);
 186         (void) wxDebugContext::SetTail (this);
 187     } else {
 188         wxDebugContext::GetTail ()->m_next = this;
 189         this->m_prev = wxDebugContext::GetTail ();
 190         (void) wxDebugContext::SetTail (this);
 191     }
 192     return 1;
 193 }
 194
 195
 196 /*
 197   Don't actually free up anything here as the space which is used
 198   by the node will be free'd up when the whole block is free'd.
 199   Returns 0 on error, non-zero on success.
 200 */
 201 int wxMemStruct::Unlink ()
 202 {
 203     if (! AssertList ())
 204         return 0;
 205
 206     if (wxDebugContext::GetHead () == 0 || wxDebugContext::GetTail () == 0) {
 207         ErrorMsg ("Trying to remove node from empty list");
 208         return 0;
 209     }
 210
 211     // Handle the part of the list before this node.
 212     if (m_prev == 0) {
 213         if (this != wxDebugContext::GetHead ()) {
 214             ErrorMsg ("No previous node for non-head node");
 215             return 0;
 216         }
 217         (void) wxDebugContext::SetHead (m_next);
 218     } else {
 219         if (! m_prev->AssertIt ()) {
 220             ErrorMsg ("Trashed previous pointer");
 221             return 0;
 222         }
 223
 224         if (m_prev->m_next != this) {
 225             ErrorMsg ("List is inconsistent");
 226             return 0;
 227         }
 228         m_prev->m_next = m_next;
 229     }
 230
 231     // Handle the part of the list after this node.
 232     if (m_next == 0) {
 233         if (this != wxDebugContext::GetTail ()) {
 234             ErrorMsg ("No next node for non-tail node");
 235             return 0;
 236         }
 237         (void) wxDebugContext::SetTail (m_prev);
 238     } else {
 239         if (! m_next->AssertIt ()) {
 240             ErrorMsg ("Trashed next pointer");
 241             return 0;
 242         }
 243
 244         if (m_next->m_prev != this) {
 245             ErrorMsg ("List is inconsistent");
 246             return 0;
 247         }
 248         m_next->m_prev = m_prev;
 249     }
 250
 251     return 1;
 252 }
 253
 254
 255
 256 /*
 257   Checks a node and block of memory to see that the markers are still
 258   intact.
 259 */
 260 int wxMemStruct::CheckBlock ()
 261 {
 262     int nFailures = 0;
 263
 264     if (m_firstMarker != MemStartCheck) {
 265         nFailures++;
 266         ErrorMsg ();
 267     }
 268
 269     char * pointer = wxDebugContext::MidMarkerPos ((char *) this);
 270     if (* (wxMarkerType *) pointer != MemMidCheck) {
 271         nFailures++;
 272         ErrorMsg ();
 273     }
 274
 275     pointer = wxDebugContext::EndMarkerPos ((char *) this, RequestSize ());
 276     if (* (wxMarkerType *) pointer != MemEndCheck) {
 277         nFailures++;
 278         ErrorMsg ();
 279     }
 280
 281     return nFailures;
 282 }
 283
 284
 285 /*
 286   Check the list of nodes to see if they are all ok.
 287 */
 288 int wxMemStruct::CheckAllPrevious ()
 289 {
 290     int nFailures = 0;
 291
 292     for (wxMemStruct * st = this->m_prev; st != 0; st = st->m_prev) {
 293         if (st->AssertIt ())
 294             nFailures += st->CheckBlock ();
 295         else
 296             return -1;
 297     }
 298
 299     return nFailures;
 300 }
 301
 302
 303 /*
 304   When we delete a node we set the id slot to a specific value and then test
 305   against this to see if a nodes have been deleted previously. I don't
 306   just set the entire memory to the fillChar because then I'd be overwriting
 307   useful stuff like the vtbl which may be needed to output the error message
 308   including the file name and line numbers. Without this info the whole point
 309   of this class is lost!
 310 */
 311 void wxMemStruct::SetDeleted ()
 312 {
 313     m_id = MemFillChar;
 314 }
 315
 316 int wxMemStruct::IsDeleted ()
 317 {
 318     return (m_id == MemFillChar);
 319 }
 320
 321
 322 /*
 323   Print out a single node. There are many far better ways of doing this
 324   but this will suffice for now.
 325 */
 326 void wxMemStruct::PrintNode ()
 327 {
 328   if (m_isObject)
 329   {
 330     wxObject *obj = (wxObject *)m_actualData;
 331     wxClassInfo *info = obj->GetClassInfo();
 332
 333     // Let's put this in standard form so IDEs can load the file at the appropriate
 334     // line
 335     wxString msg("");
 336
 337     if (m_fileName)
 338       msg.Printf("%s(%d): ", m_fileName, (int)m_lineNum);
 339
 340     if (info && info->GetClassName())
 341       msg += info->GetClassName();
 342     else
 343       msg += "object";
 344
 345     wxString msg2;
 346     msg2.Printf(" at $%lX, size %d", (long)GetActualData(), (int)RequestSize());
 347     msg += msg2;
 348
 349     wxLogDebug(msg);
 350   }
 351   else
 352   {
 353     wxString msg("");
 354
 355     if (m_fileName)
 356       msg.Printf("%s(%d): ", m_fileName, (int)m_lineNum);
 357     msg += ("non-object data");
 358     wxString msg2;
 359     msg2.Printf(" at $%lX, size %d\n", (long)GetActualData(), (int)RequestSize());
 360     msg += msg2;
 361
 362     wxLogDebug(msg);
 363   }
 364 }
 365
 366 void wxMemStruct::Dump ()
 367 {
 368   if (!ValidateNode()) return;
 369
 370   if (m_isObject)
 371   {
 372     wxObject *obj = (wxObject *)m_actualData;
 373
 374     wxString msg("");
 375     if (m_fileName)
 376       msg.Printf("%s(%d): ", m_fileName, (int)m_lineNum);
 377
 378
 379     /* TODO: We no longer have a stream (using wxLogDebug) so we can't dump it.
 380      * Instead, do what wxObject::Dump does.
 381      * What should we do long-term, eliminate Dumping? Or specify
 382      * that MyClass::Dump should use wxLogDebug? Ugh.
 383     obj->Dump(wxDebugContext::GetStream());
 384      */
 385
 386     if (obj->GetClassInfo() && obj->GetClassInfo()->GetClassName())
 387       msg += obj->GetClassInfo()->GetClassName();
 388     else
 389       msg += "unknown object class";
 390
 391     wxString msg2("");
 392     msg2.Printf(" at $%lX, size %d", (long)GetActualData(), (int)RequestSize());
 393     msg += msg2;
 394
 395     wxLogDebug(msg);
 396   }
 397   else
 398   {
 399     wxString msg("");
 400     if (m_fileName)
 401       msg.Printf("%s(%d): ", m_fileName, (int)m_lineNum);
 402
 403     wxString msg2("");
 404     msg2.Printf("non-object data at $%lX, size %d", (long)GetActualData(), (int)RequestSize() );
 405     msg += msg2;
 406     wxLogDebug(msg);
 407   }
 408 }
 409
 410
 411 /*
 412   Validate a node. Check to see that the node is "clean" in the sense
 413   that nothing has over/underwritten it etc.
 414 */
 415 int wxMemStruct::ValidateNode ()
 416 {
 417     char * startPointer = (char *) this;
 418     if (!AssertIt ()) {
 419         if (IsDeleted ())
 420             ErrorMsg ("Object already deleted");
 421         else {
 422             // Can't use the error routines as we have no recognisable object.
 423 #ifndef __WXGTK__
 424              wxLogDebug("Can't verify memory struct - all bets are off!");
 425 #endif
 426         }
 427         return 0;
 428     }
 429
 430 /*
 431     int i;
 432     for (i = 0; i < wxDebugContext::TotSize (requestSize ()); i++)
 433       cout << startPointer [i];
 434     cout << endl;
 435 */
 436     if (Marker () != MemStartCheck)
 437       ErrorMsg ();
 438     if (* (wxMarkerType *) wxDebugContext::MidMarkerPos (startPointer) != MemMidCheck)
 439       ErrorMsg ();
 440     if (* (wxMarkerType *) wxDebugContext::EndMarkerPos (startPointer,
 441                                               RequestSize ()) !=
 442         MemEndCheck)
 443       ErrorMsg ();
 444
 445     // Back to before the extra buffer and check that
 446     // we can still read what we originally wrote.
 447     if (Marker () != MemStartCheck ||
 448         * (wxMarkerType *) wxDebugContext::MidMarkerPos (startPointer)
 449                          != MemMidCheck ||
 450         * (wxMarkerType *) wxDebugContext::EndMarkerPos (startPointer,
 451                                               RequestSize ()) != MemEndCheck)
 452     {
 453         ErrorMsg ();
 454         return 0;
 455     }
 456
 457     return 1;
 458 }
 459
 460 /*
 461   The wxDebugContext class.
 462 */
 463
 464 wxMemStruct *wxDebugContext::m_head = NULL;
 465 wxMemStruct *wxDebugContext::m_tail = NULL;
 466 // ostream *wxDebugContext::m_debugStream = NULL;
 467 // streambuf *wxDebugContext::m_streamBuf = NULL;
 468
 469 // Must initialise these in wxEntry, and then delete them just before wxEntry exits
 470 streambuf *wxDebugContext::m_streamBuf = NULL;
 471 ostream *wxDebugContext::m_debugStream = NULL;
 472
 473 bool wxDebugContext::m_checkPrevious = FALSE;
 474 int wxDebugContext::debugLevel = 1;
 475 bool wxDebugContext::debugOn = TRUE;
 476 wxMemStruct *wxDebugContext::checkPoint = NULL;
 477
 478 wxDebugContext::wxDebugContext(void)
 479 {
 480 //  m_streamBuf = new wxDebugStreamBuf;
 481 //  m_debugStream = new ostream(m_streamBuf);
 482 }
 483
 484 wxDebugContext::~wxDebugContext(void)
 485 {
 486   SetStream(NULL, NULL);
 487 }
 488
 489 /*
 490  * It's bizarre, but with BC++ 4.5, the value of str changes
 491  * between SetFile and SetStream.
 492  */
 493
 494 void wxDebugContext::SetStream(ostream *str, streambuf *buf)
 495 {
 496   if (m_debugStream)
 497   {
 498     m_debugStream->flush();
 499     delete m_debugStream;
 500   }
 501   m_debugStream = NULL;
 502
 503   // Not allowed in Watcom (~streambuf is protected).
 504   // Is this trying to say something significant to us??
 505 #ifndef __WATCOMC__
 506   if (m_streamBuf)
 507   {
 508     streambuf* oldBuf = m_streamBuf;
 509     m_streamBuf = NULL;
 510     delete oldBuf;
 511   }
 512 #endif
 513   m_streamBuf = buf;
 514   m_debugStream = str;
 515 }
 516
 517 bool wxDebugContext::SetFile(const wxString& file)
 518 {
 519   ofstream *str = new ofstream((char *) (const char *)file);
 520
 521   if (str->bad())
 522   {
 523     delete str;
 524     return FALSE;
 525   }
 526   else
 527   {
 528     SetStream(str);
 529     return TRUE;
 530   }
 531 }
 532
 533 bool wxDebugContext::SetStandardError(void)
 534 {
 535 #if !defined(_WINDLL)
 536   wxDebugStreamBuf *buf = new wxDebugStreamBuf;
 537   ostream *stream = new ostream(m_streamBuf);
 538   SetStream(stream, buf);
 539   return TRUE;
 540 #else
 541   return FALSE;
 542 #endif
 543 }
 544
 545
 546 /*
 547   Work out the positions of the markers by creating an array of 2 markers
 548   and comparing the addresses of the 2 elements. Use this number as the
 549   alignment for markers.
 550 */
 551 size_t wxDebugContext::CalcAlignment ()
 552 {
 553     wxMarkerType ar[2];
 554     return (char *) &ar[1] - (char *) &ar[0];
 555 }
 556
 557
 558 char * wxDebugContext::StructPos (const char * buf)
 559 {
 560     return (char *) buf;
 561 }
 562
 563 char * wxDebugContext::MidMarkerPos (const char * buf)
 564 {
 565     return StructPos (buf) + PaddedSize (sizeof (wxMemStruct));
 566 }
 567
 568 char * wxDebugContext::CallerMemPos (const char * buf)
 569 {
 570     return MidMarkerPos (buf) + PaddedSize (sizeof(wxMarkerType));
 571 }
 572
 573
 574 char * wxDebugContext::EndMarkerPos (const char * buf, const size_t size)
 575 {
 576     return CallerMemPos (buf) + PaddedSize (size);
 577 }
 578
 579
 580 /*
 581   Slightly different as this takes a pointer to the start of the caller
 582   requested region and returns a pointer to the start of the buffer.
 583   */
 584 char * wxDebugContext::StartPos (const char * caller)
 585 {
 586     return ((char *) (caller - wxDebugContext::PaddedSize (sizeof(wxMarkerType)) -
 587             wxDebugContext::PaddedSize (sizeof (wxMemStruct))));
 588 }
 589
 590 /*
 591   We may need padding between various parts of the allocated memory.
 592   Given a size of memory, this returns the amount of memory which should
 593   be allocated in order to allow for alignment of the following object.
 594
 595   I don't know how portable this stuff is, but it seems to work for me at
 596   the moment. It would be real nice if I knew more about this!
 597 */
 598 size_t wxDebugContext::GetPadding (const size_t size)
 599 {
 600     size_t pad = size % CalcAlignment ();
 601     return (pad) ? sizeof(wxMarkerType) - pad : 0;
 602 }
 603
 604
 605
 606 size_t wxDebugContext::PaddedSize (const size_t size)
 607 {
 608     return size + GetPadding (size);
 609 }
 610
 611 /*
 612   Returns the total amount of memory which we need to get from the system
 613   in order to satisfy a caller request. This includes space for the struct
 614   plus markers and the caller's memory as well.
 615 */
 616 size_t wxDebugContext::TotSize (const size_t reqSize)
 617 {
 618     return (PaddedSize (sizeof (wxMemStruct)) + PaddedSize (reqSize) +
 619             2 * sizeof(wxMarkerType));
 620 }
 621
 622
 623 /*
 624   Traverse the list of nodes executing the given function on each node.
 625 */
 626 void wxDebugContext::TraverseList (PmSFV func, wxMemStruct *from)
 627 {
 628   if (!from)
 629     from = wxDebugContext::GetHead ();
 630
 631   for (wxMemStruct * st = from; st != 0; st = st->m_next)
 632   {
 633       void* data = st->GetActualData();
 634 //      if ((data != (void*)m_debugStream) && (data != (void*) m_streamBuf))
 635       if (data != (void*) wxLog::GetActiveTarget())
 636       {
 637         (st->*func) ();
 638       }
 639   }
 640 }
 641
 642
 643 /*
 644   Print out the list.
 645   */
 646 bool wxDebugContext::PrintList (void)
 647 {
 648 #ifdef __WXDEBUG__
 649 //  if (!HasStream())
 650 //    return FALSE;
 651
 652   TraverseList ((PmSFV)&wxMemStruct::PrintNode, (checkPoint ? checkPoint->m_next : (wxMemStruct*)NULL));
 653
 654   return TRUE;
 655 #else
 656   return FALSE;
 657 #endif
 658 }
 659
 660 bool wxDebugContext::Dump(void)
 661 {
 662 #ifdef __WXDEBUG__
 663 //  if (!HasStream())
 664 //    return FALSE;
 665
 666   if (TRUE)
 667   {
 668     char* appName = "application";
 669     wxString appNameStr("");
 670     if (wxTheApp)
 671     {
 672         appNameStr = wxTheApp->GetAppName();
 673         appName = (char*) (const char*) appNameStr;
 674         wxLogDebug("----- Memory dump of %s at %s -----", appName, WXSTRINGCAST wxNow() );
 675     }
 676     else
 677     {
 678       wxLogDebug( "----- Memory dump -----" );
 679     }
 680   }
 681   TraverseList ((PmSFV)&wxMemStruct::Dump, (checkPoint ? checkPoint->m_next : (wxMemStruct*)NULL));
 682
 683   wxLogDebug( "" );
 684   wxLogDebug( "" );
 685
 686   return TRUE;
 687 #else
 688   return FALSE;
 689 #endif
 690 }
 691
 692 struct wxDebugStatsStruct
 693 {
 694   long instanceCount;
 695   long totalSize;
 696   char *instanceClass;
 697   wxDebugStatsStruct *next;
 698 };
 699
 700 static wxDebugStatsStruct *FindStatsStruct(wxDebugStatsStruct *st, char *name)
 701 {
 702   while (st)
 703   {
 704     if (strcmp(st->instanceClass, name) == 0)
 705       return st;
 706     st = st->next;
 707   }
 708   return NULL;
 709 }
 710
 711 static wxDebugStatsStruct *InsertStatsStruct(wxDebugStatsStruct *head, wxDebugStatsStruct *st)
 712 {
 713   st->next = head;
 714   return st;
 715 }
 716
 717 bool wxDebugContext::PrintStatistics(bool detailed)
 718 {
 719 #ifdef __WXDEBUG__
 720 //  if (!HasStream())
 721 //    return FALSE;
 722
 723   if (TRUE)
 724   {
 725     char* appName = "application";
 726     wxString appNameStr("");
 727     if (wxTheApp)
 728     {
 729         appNameStr = wxTheApp->GetAppName();
 730         appName = (char*) (const char*) appNameStr;
 731         wxLogDebug("----- Memory statistics of %s at %s -----", appName, WXSTRINGCAST wxNow() );
 732     }
 733     else
 734     {
 735       wxLogDebug( "----- Memory statistics -----" );
 736     }
 737   }
 738
 739   bool currentMode = GetDebugMode();
 740   SetDebugMode(FALSE);
 741
 742   long noNonObjectNodes = 0;
 743   long noObjectNodes = 0;
 744   long totalSize = 0;
 745
 746   wxDebugStatsStruct *list = NULL;
 747
 748   wxMemStruct *from = (checkPoint ? checkPoint->m_next : (wxMemStruct*)NULL );
 749   if (!from)
 750     from = wxDebugContext::GetHead ();
 751
 752   wxMemStruct *st;
 753   for (st = from; st != 0; st = st->m_next)
 754   {
 755     void* data = st->GetActualData();
 756 //    if (detailed && (data != (void*)m_debugStream) && (data != (void*) m_streamBuf))
 757       if (detailed && (data != (void*) wxLog::GetActiveTarget()))
 758     {
 759       char *className = "nonobject";
 760       if (st->m_isObject && st->GetActualData())
 761       {
 762         wxObject *obj = (wxObject *)st->GetActualData();
 763         if (obj->GetClassInfo()->GetClassName())
 764           className = obj->GetClassInfo()->GetClassName();
 765       }
 766       wxDebugStatsStruct *stats = FindStatsStruct(list, className);
 767       if (!stats)
 768       {
 769         stats = (wxDebugStatsStruct *)malloc(sizeof(wxDebugStatsStruct));
 770         stats->instanceClass = className;
 771         stats->instanceCount = 0;
 772         stats->totalSize = 0;
 773         list = InsertStatsStruct(list, stats);
 774       }
 775       stats->instanceCount ++;
 776       stats->totalSize += st->RequestSize();
 777     }
 778
 779 //    if ((data != (void*)m_debugStream) && (data != (void*) m_streamBuf))
 780     if (data != (void*) wxLog::GetActiveTarget())
 781     {
 782         totalSize += st->RequestSize();
 783         if (st->m_isObject)
 784             noObjectNodes ++;
 785         else
 786             noNonObjectNodes ++;
 787     }
 788   }
 789
 790   if (detailed)
 791   {
 792     while (list)
 793     {
 794       wxLogDebug("%ld objects of class %s, total size %ld",
 795           list->instanceCount, list->instanceClass, list->totalSize);
 796       wxDebugStatsStruct *old = list;
 797       list = old->next;
 798       free((char *)old);
 799     }
 800     wxLogDebug("");
 801   }
 802
 803   SetDebugMode(currentMode);
 804
 805   wxLogDebug("Number of object items: %ld", noObjectNodes);
 806   wxLogDebug("Number of non-object items: %ld", noNonObjectNodes);
 807   wxLogDebug("Total allocated size: %ld", totalSize);
 808   wxLogDebug("");
 809   wxLogDebug("");
 810
 811   return TRUE;
 812 #else
 813   return FALSE;
 814 #endif
 815 }
 816
 817 bool wxDebugContext::PrintClasses(void)
 818 {
 819 //  if (!HasStream())
 820 //    return FALSE;
 821
 822   if (TRUE)
 823   {
 824     char* appName = "application";
 825     wxString appNameStr("");
 826     if (wxTheApp)
 827     {
 828         appNameStr = wxTheApp->GetAppName();
 829         appName = (char*) (const char*) appNameStr;
 830         wxLogDebug("----- Classes in %s -----", appName);
 831     }
 832   }
 833
 834   int n = 0;
 835   wxNode *node;
 836   wxClassInfo *info;
 837
 838   wxClassInfo::sm_classTable->BeginFind();
 839   node = wxClassInfo::sm_classTable->Next();
 840   while (node)
 841   {
 842     info = (wxClassInfo *)node->Data();
 843     if (info->GetClassName())
 844     {
 845         wxString msg(info->GetClassName());
 846         msg += " ";
 847
 848         if (info->GetBaseClassName1() && !info->GetBaseClassName2())
 849         {
 850             msg += "is a ";
 851             msg += info->GetBaseClassName1();
 852         }
 853         else if (info->GetBaseClassName1() && info->GetBaseClassName2())
 854         {
 855             msg += "is a ";
 856             msg += info->GetBaseClassName1() ;
 857             msg += ", ";
 858             msg += info->GetBaseClassName2() ;
 859         }
 860         if (info->GetConstructor())
 861             msg += ": dynamic";
 862
 863         wxLogDebug(msg);
 864     }
 865     node = wxClassInfo::sm_classTable->Next();
 866     n ++;
 867   }
 868   wxLogDebug("");
 869   wxLogDebug("There are %d classes derived from wxObject.", n);
 870   wxLogDebug("");
 871   wxLogDebug("");
 872   return TRUE;
 873 }
 874
 875 void wxDebugContext::SetCheckpoint(bool all)
 876 {
 877   if (all)
 878     checkPoint = NULL;
 879   else
 880     checkPoint = m_tail;
 881 }
 882
 883 // Checks all nodes since checkpoint, or since start.
 884 int wxDebugContext::Check(bool checkAll)
 885 {
 886   int nFailures = 0;
 887
 888   wxMemStruct *from = (checkPoint ? checkPoint->m_next : (wxMemStruct*)NULL );
 889   if (!from || checkAll)
 890     from = wxDebugContext::GetHead ();
 891
 892   for (wxMemStruct * st = from; st != 0; st = st->m_next)
 893   {
 894     if (st->AssertIt ())
 895       nFailures += st->CheckBlock ();
 896     else
 897       return -1;
 898   }
 899
 900   return nFailures;
 901 }
 902
 903 // Count the number of non-wxDebugContext-related objects
 904 // that are outstanding
 905 int wxDebugContext::CountObjectsLeft(bool sinceCheckpoint)
 906 {
 907   int n = 0;
 908
 909   wxMemStruct *from = NULL;
 910   if (sinceCheckpoint && checkPoint)
 911     from = checkPoint->m_next;
 912   if (from == (wxMemStruct*) NULL)
 913     from = wxDebugContext::GetHead () ;
 914
 915   for (wxMemStruct * st = from; st != 0; st = st->m_next)
 916   {
 917       void* data = st->GetActualData();
 918 //      if ((data != (void*)m_debugStream) && (data != (void*) m_streamBuf))
 919       if (data != (void*) wxLog::GetActiveTarget())
 920           n ++;
 921   }
 922
 923   return n ;
 924 }
 925
 926 /*
 927   The global operator new used for everything apart from getting
 928   dynamic storage within this function itself.
 929 */
 930
 931 // We'll only do malloc and free for the moment: leave the interesting
 932 // stuff for the wxObject versions.
 933
 934 #if defined(__WXDEBUG__) && wxUSE_GLOBAL_MEMORY_OPERATORS
 935
 936 #ifdef new
 937 #undef new
 938 #endif
 939
 940 // Seems OK all of a sudden. Maybe to do with linking with multithreaded library?
 941 #if 0 // def _MSC_VER
 942 #define NO_DEBUG_ALLOCATION
 943 #endif
 944
 945 // Unfortunately ~wxDebugStreamBuf doesn't work (VC++ 5) when we enable the debugging
 946 // code. I have no idea why. In BC++ 4.5, we have a similar problem the debug
 947 // stream myseriously changing pointer address between being passed from SetFile to SetStream.
 948 // See docs/msw/issues.txt.
 949 void * operator new (size_t size, char * fileName, int lineNum)
 950 {
 951 #ifdef NO_DEBUG_ALLOCATION
 952   return malloc(size);
 953 #else
 954   return wxDebugAlloc(size, fileName, lineNum, FALSE, FALSE);
 955 #endif
 956 }
 957
 958 // Added JACS 25/11/98
 959 void * operator new (size_t size)
 960 {
 961 #ifdef NO_DEBUG_ALLOCATION
 962   return malloc(size);
 963 #else
 964   return wxDebugAlloc(size, NULL, 0, FALSE);
 965 #endif
 966 }
 967
 968 #if !( defined (_MSC_VER) && (_MSC_VER <= 1020) )
 969 void * operator new[] (size_t size)
 970 {
 971 #ifdef NO_DEBUG_ALLOCATION
 972   return malloc(size);
 973 #else
 974   return wxDebugAlloc(size, NULL, 0, FALSE, TRUE);
 975 #endif
 976 }
 977 #endif
 978
 979 #if !( defined (_MSC_VER) && (_MSC_VER <= 1020) )
 980 void * operator new[] (size_t size, char * fileName, int lineNum)
 981 {
 982 #ifdef NO_DEBUG_ALLOCATION
 983   return malloc(size);
 984 #else
 985   return wxDebugAlloc(size, fileName, lineNum, FALSE, TRUE);
 986 #endif
 987 }
 988 #endif
 989
 990 void operator delete (void * buf)
 991 {
 992 #ifdef NO_DEBUG_ALLOCATION
 993   free((char*) buf);
 994 #else
 995   wxDebugFree(buf);
 996 #endif
 997 }
 998
 999 // VC++ 6.0
1000 #if _MSC_VER >= 1200
1001 void operator delete(void* pData, char* /* fileName */, int /* lineNum */)
1002 {
1003 // ::operator delete(pData);
1004   // JACS 21/11/1998: surely we need to call wxDebugFree?
1005   wxDebugFree(pData, FALSE);
1006 }
1007 // New operator 21/11/1998
1008 void operator delete[](void* pData, char* /* fileName */, int /* lineNum */)
1009 {
1010   wxDebugFree(pData, TRUE);
1011 }
1012 #endif
1013
1014 #if !( defined (_MSC_VER) && (_MSC_VER <= 1020) )
1015
1016 void operator delete[] (void * buf)
1017 {
1018 #ifdef NO_DEBUG_ALLOCATION
1019   free((char*) buf);
1020 #else
1021   wxDebugFree(buf, TRUE);
1022 #endif
1023 }
1024 #endif
1025
1026 #endif
1027
1028 // TODO: store whether this is a vector or not.
1029 void * wxDebugAlloc(size_t size, char * fileName, int lineNum, bool isObject, bool WXUNUSED(isVect) )
1030 {
1031   // If not in debugging allocation mode, do the normal thing
1032   // so we don't leave any trace of ourselves in the node list.
1033
1034   if (!wxDebugContext::GetDebugMode())
1035   {
1036     return (void *)malloc(size);
1037   }
1038
1039     char * buf = (char *) malloc(wxDebugContext::TotSize (size));
1040     if (!buf) {
1041         wxLogDebug("Call to malloc (%ld) failed.", (long)size);
1042         return 0;
1043     }
1044     wxMemStruct * st = (wxMemStruct *)buf;
1045     st->m_firstMarker = MemStartCheck;
1046     st->m_reqSize = size;
1047     st->m_fileName = fileName;
1048     st->m_lineNum = lineNum;
1049     st->m_id = MemStructId;
1050     st->m_prev = 0;
1051     st->m_next = 0;
1052     st->m_isObject = isObject;
1053
1054     // Errors from Append() shouldn't really happen - but just in case!
1055     if (st->Append () == 0) {
1056         st->ErrorMsg ("Trying to append new node");
1057     }
1058
1059     if (wxDebugContext::GetCheckPrevious ()) {
1060         if (st->CheckAllPrevious () < 0) {
1061             st->ErrorMsg ("Checking previous nodes");
1062         }
1063     }
1064
1065     // Set up the extra markers at the middle and end.
1066     char * ptr = wxDebugContext::MidMarkerPos (buf);
1067     * (wxMarkerType *) ptr = MemMidCheck;
1068     ptr = wxDebugContext::EndMarkerPos (buf, size);
1069     * (wxMarkerType *) ptr = MemEndCheck;
1070
1071     // pointer returned points to the start of the caller's
1072     // usable area.
1073     void *m_actualData = (void *) wxDebugContext::CallerMemPos (buf);
1074     st->m_actualData = m_actualData;
1075
1076     return m_actualData;
1077 }
1078
1079 // TODO: check whether was allocated as a vector
1080 void wxDebugFree(void * buf, bool WXUNUSED(isVect) )
1081 {
1082   if (!buf)
1083     return;
1084
1085   // If not in debugging allocation mode, do the normal thing
1086   // so we don't leave any trace of ourselves in the node list.
1087   if (!wxDebugContext::GetDebugMode())
1088   {
1089     free((char *)buf);
1090     return;
1091   }
1092
1093     // Points to the start of the entire allocated area.
1094     char * startPointer = wxDebugContext::StartPos ((char *) buf);
1095     // Find the struct and make sure that it's identifiable.
1096     wxMemStruct * st = (wxMemStruct *) wxDebugContext::StructPos (startPointer);
1097
1098     if (! st->ValidateNode ())
1099         return;
1100
1101     // If this is the current checkpoint, we need to
1102     // move the checkpoint back so it points to a valid
1103     // node.
1104     if (st == wxDebugContext::checkPoint)
1105       wxDebugContext::checkPoint = wxDebugContext::checkPoint->m_prev;
1106
1107     if (! st->Unlink ())
1108     {
1109       st->ErrorMsg ("Unlinking deleted node");
1110     }
1111
1112     // Now put in the fill char into the id slot and the caller requested
1113     // memory locations.
1114     st->SetDeleted ();
1115     (void) memset (wxDebugContext::CallerMemPos (startPointer), MemFillChar,
1116                    st->RequestSize ());
1117
1118     // Don't allow delayed freeing of memory in this version
1119 //    if (!wxDebugContext::GetDelayFree())
1120 //    free((void *)st);
1121     free((char *)st);
1122 }
1123
1124 // Trace: send output to the current debugging stream
1125 void wxTrace(const char *fmt ...)
1126 {
1127   va_list ap;
1128   static char buffer[512];
1129
1130   va_start(ap, fmt);
1131
1132 #ifdef __WXMSW__
1133   wvsprintf(buffer,fmt,ap) ;
1134 #else
1135   vsprintf(buffer,fmt,ap) ;
1136 #endif
1137
1138   va_end(ap);
1139
1140   if (wxDebugContext::HasStream())
1141   {
1142     wxDebugContext::GetStream() << buffer;
1143     wxDebugContext::GetStream().flush();
1144   }
1145   else
1146 #ifdef __WXMSW__
1147     OutputDebugString((LPCSTR)buffer) ;
1148 #else
1149     fprintf(stderr, buffer);
1150 #endif
1151 }
1152
1153 // Trace with level
1154 void wxTraceLevel(int level, const char *fmt ...)
1155 {
1156   if (wxDebugContext::GetLevel() < level)
1157     return;
1158
1159   va_list ap;
1160   static char buffer[512];
1161
1162   va_start(ap, fmt);
1163
1164 #ifdef __WXMSW__
1165   wvsprintf(buffer,fmt,ap) ;
1166 #else
1167   vsprintf(buffer,fmt,ap) ;
1168 #endif
1169
1170   va_end(ap);
1171
1172   if (wxDebugContext::HasStream())
1173   {
1174     wxDebugContext::GetStream() << buffer;
1175     wxDebugContext::GetStream().flush();
1176   }
1177   else
1178 #ifdef __WXMSW__
1179     OutputDebugString((LPCSTR)buffer) ;
1180 #else
1181     fprintf(stderr, buffer);
1182 #endif
1183 }
1184
1185 #else // wxUSE_MEMORY_TRACING && defined(__WXDEBUG__)
1186 void wxTrace(const char *WXUNUSED(fmt) ...)
1187 {
1188 }
1189
1190 void wxTraceLevel(int WXUNUSED(level), const char *WXUNUSED(fmt) ...)
1191 {
1192 }
1193 #endif
1194