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