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 #if wxUSE_THREADS
  39 #include "wx/thread.h"
  40 #endif
  41
  42 #include "wx/log.h"
  43 #include <stdlib.h>
  44
  45 #include "wx/ioswrap.h"
  46
  47 #if !defined(__WATCOMC__) && !(defined(__VMS__) && ( __VMS_VER < 70000000 ) )\
  48      && !defined( __MWERKS__ ) && !defined(__SALFORDC__)
  49 #include <memory.h>
  50 #endif
  51
  52 #include <stdarg.h>
  53 #include <string.h>
  54
  55 #ifdef __WXMSW__
  56 #include <windows.h>
  57
  58 #ifdef GetClassInfo
  59 #undef GetClassInfo
  60 #endif
  61
  62 #ifdef GetClassName
  63 #undef GetClassName
  64 #endif
  65
  66 #endif
  67
  68 #include "wx/memory.h"
  69
  70 #if wxUSE_THREADS && defined(__WXDEBUG__) && !defined(__WXMAC__)
  71 #define USE_THREADSAFE_MEMORY_ALLOCATION 1
  72 #else
  73 #define USE_THREADSAFE_MEMORY_ALLOCATION 0
  74 #endif
  75
  76
  77 #ifdef new
  78 #undef new
  79 #endif
  80
  81 // wxDebugContext wxTheDebugContext;
  82 /*
  83   Redefine new and delete so that we can pick up situations where:
  84         - we overwrite or underwrite areas of malloc'd memory.
  85         - we use uninitialise variables
  86   Only do this in debug mode.
  87
  88   We change new to get enough memory to allocate a struct, followed
  89   by the caller's requested memory, followed by a tag. The struct
  90   is used to create a doubly linked list of these areas and also
  91   contains another tag. The tags are used to determine when the area
  92   has been over/under written.
  93 */
  94
  95
  96 /*
  97   Values which are used to set the markers which will be tested for
  98   under/over write. There are 3 of these, one in the struct, one
  99   immediately after the struct but before the caller requested memory and
 100   one immediately after the requested memory.
 101 */
 102 #define MemStartCheck  0x23A8
 103 #define MemMidCheck  0xA328
 104 #define MemEndCheck 0x8A32
 105 #define MemFillChar 0xAF
 106 #define MemStructId  0x666D
 107
 108 /*
 109   External interface for the wxMemStruct class. Others are
 110   defined inline within the class def. Here we only need to be able
 111   to add and delete nodes from the list and handle errors in some way.
 112 */
 113
 114 /*
 115   Used for internal "this shouldn't happen" type of errors.
 116 */
 117 void wxMemStruct::ErrorMsg (const char * mesg)
 118 {
 119   wxLogMessage(wxT("wxWindows memory checking error: %s"), mesg);
 120   PrintNode ();
 121 }
 122
 123 /*
 124   Used when we find an overwrite or an underwrite error.
 125 */
 126 void wxMemStruct::ErrorMsg ()
 127 {
 128   wxLogMessage(wxT("wxWindows over/underwrite memory error:"));
 129   PrintNode ();
 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     // Let's put this in standard form so IDEs can load the file at the appropriate
 333     // line
 334     wxString msg(wxT(""));
 335
 336     if (m_fileName)
 337       msg.Printf(wxT("%s(%d): "), m_fileName, (int)m_lineNum);
 338
 339     if (info && info->GetClassName())
 340       msg += info->GetClassName();
 341     else
 342       msg += wxT("object");
 343
 344     wxString msg2;
 345     msg2.Printf(wxT(" at $%lX, size %d"), (long)GetActualData(), (int)RequestSize());
 346     msg += msg2;
 347
 348     wxLogMessage(msg);
 349   }
 350   else
 351   {
 352     wxString msg("");
 353
 354     if (m_fileName)
 355       msg.Printf(wxT("%s(%d): "), m_fileName, (int)m_lineNum);
 356     msg += wxT("non-object data");
 357     wxString msg2;
 358     msg2.Printf(wxT(" at $%lX, size %d\n"), (long)GetActualData(), (int)RequestSize());
 359     msg += msg2;
 360
 361     wxLogMessage(msg);
 362   }
 363 }
 364
 365 void wxMemStruct::Dump ()
 366 {
 367   if (!ValidateNode()) return;
 368
 369   if (m_isObject)
 370   {
 371     wxObject *obj = (wxObject *)m_actualData;
 372
 373     wxString msg(wxT(""));
 374     if (m_fileName)
 375       msg.Printf(wxT("%s(%d): "), m_fileName, (int)m_lineNum);
 376
 377
 378     /* TODO: We no longer have a stream (using wxLogDebug) so we can't dump it.
 379      * Instead, do what wxObject::Dump does.
 380      * What should we do long-term, eliminate Dumping? Or specify
 381      * that MyClass::Dump should use wxLogDebug? Ugh.
 382     obj->Dump(wxDebugContext::GetStream());
 383      */
 384
 385     if (obj->GetClassInfo() && obj->GetClassInfo()->GetClassName())
 386       msg += obj->GetClassInfo()->GetClassName();
 387     else
 388       msg += wxT("unknown object class");
 389
 390     wxString msg2("");
 391     msg2.Printf(wxT(" at $%lX, size %d"), (long)GetActualData(), (int)RequestSize());
 392     msg += msg2;
 393
 394     wxLogMessage(msg);
 395   }
 396   else
 397   {
 398     wxString msg(wxT(""));
 399     if (m_fileName)
 400       msg.Printf(wxT("%s(%d): "), m_fileName, (int)m_lineNum);
 401
 402     wxString msg2("");
 403     msg2.Printf(wxT("non-object data at $%lX, size %d"), (long)GetActualData(), (int)RequestSize() );
 404     msg += msg2;
 405     wxLogMessage(msg);
 406   }
 407 }
 408
 409
 410 /*
 411   Validate a node. Check to see that the node is "clean" in the sense
 412   that nothing has over/underwritten it etc.
 413 */
 414 int wxMemStruct::ValidateNode ()
 415 {
 416     char * startPointer = (char *) this;
 417     if (!AssertIt ()) {
 418         if (IsDeleted ())
 419             ErrorMsg ("Object already deleted");
 420         else {
 421             // Can't use the error routines as we have no recognisable object.
 422 #ifndef __WXGTK__
 423              wxLogMessage(wxT("Can't verify memory struct - all bets are off!"));
 424 #endif
 425         }
 426         return 0;
 427     }
 428
 429 /*
 430     int i;
 431     for (i = 0; i < wxDebugContext::TotSize (requestSize ()); i++)
 432       cout << startPointer [i];
 433     cout << endl;
 434 */
 435     if (Marker () != MemStartCheck)
 436       ErrorMsg ();
 437     if (* (wxMarkerType *) wxDebugContext::MidMarkerPos (startPointer) != MemMidCheck)
 438       ErrorMsg ();
 439     if (* (wxMarkerType *) wxDebugContext::EndMarkerPos (startPointer,
 440                                               RequestSize ()) !=
 441         MemEndCheck)
 442       ErrorMsg ();
 443
 444     // Back to before the extra buffer and check that
 445     // we can still read what we originally wrote.
 446     if (Marker () != MemStartCheck ||
 447         * (wxMarkerType *) wxDebugContext::MidMarkerPos (startPointer)
 448                          != MemMidCheck ||
 449         * (wxMarkerType *) wxDebugContext::EndMarkerPos (startPointer,
 450                                               RequestSize ()) != MemEndCheck)
 451     {
 452         ErrorMsg ();
 453         return 0;
 454     }
 455
 456     return 1;
 457 }
 458
 459 /*
 460   The wxDebugContext class.
 461 */
 462
 463 wxMemStruct *wxDebugContext::m_head = NULL;
 464 wxMemStruct *wxDebugContext::m_tail = NULL;
 465
 466 bool wxDebugContext::m_checkPrevious = FALSE;
 467 int wxDebugContext::debugLevel = 1;
 468 bool wxDebugContext::debugOn = TRUE;
 469 wxMemStruct *wxDebugContext::checkPoint = NULL;
 470
 471 // For faster alignment calculation
 472 static wxMarkerType markerCalc[2];
 473 int wxDebugContext::m_balign = (int)((char *)&markerCalc[1] - (char*)&markerCalc[0]);
 474 int wxDebugContext::m_balignmask = (int)((char *)&markerCalc[1] - (char*)&markerCalc[0]) - 1;
 475
 476 wxDebugContext::wxDebugContext(void)
 477 {
 478 }
 479
 480 wxDebugContext::~wxDebugContext(void)
 481 {
 482 }
 483
 484 /*
 485   Work out the positions of the markers by creating an array of 2 markers
 486   and comparing the addresses of the 2 elements. Use this number as the
 487   alignment for markers.
 488 */
 489 size_t wxDebugContext::CalcAlignment ()
 490 {
 491     wxMarkerType ar[2];
 492     return (char *) &ar[1] - (char *) &ar[0];
 493 }
 494
 495
 496 char * wxDebugContext::StructPos (const char * buf)
 497 {
 498     return (char *) buf;
 499 }
 500
 501 char * wxDebugContext::MidMarkerPos (const char * buf)
 502 {
 503     return StructPos (buf) + PaddedSize (sizeof (wxMemStruct));
 504 }
 505
 506 char * wxDebugContext::CallerMemPos (const char * buf)
 507 {
 508     return MidMarkerPos (buf) + PaddedSize (sizeof(wxMarkerType));
 509 }
 510
 511
 512 char * wxDebugContext::EndMarkerPos (const char * buf, const size_t size)
 513 {
 514     return CallerMemPos (buf) + PaddedSize (size);
 515 }
 516
 517
 518 /*
 519   Slightly different as this takes a pointer to the start of the caller
 520   requested region and returns a pointer to the start of the buffer.
 521   */
 522 char * wxDebugContext::StartPos (const char * caller)
 523 {
 524     return ((char *) (caller - wxDebugContext::PaddedSize (sizeof(wxMarkerType)) -
 525             wxDebugContext::PaddedSize (sizeof (wxMemStruct))));
 526 }
 527
 528 /*
 529   We may need padding between various parts of the allocated memory.
 530   Given a size of memory, this returns the amount of memory which should
 531   be allocated in order to allow for alignment of the following object.
 532
 533   I don't know how portable this stuff is, but it seems to work for me at
 534   the moment. It would be real nice if I knew more about this!
 535
 536   // Note: this function is now obsolete (along with CalcAlignment)
 537   // because the calculations are done statically, for greater speed.
 538 */
 539 size_t wxDebugContext::GetPadding (const size_t size)
 540 {
 541     size_t pad = size % CalcAlignment ();
 542     return (pad) ? sizeof(wxMarkerType) - pad : 0;
 543 }
 544
 545 size_t wxDebugContext::PaddedSize (const size_t size)
 546 {
 547     // Added by Terry Farnham <TJRT@pacbell.net> to replace
 548     // slow GetPadding call.
 549     int padb;
 550
 551     padb = size & m_balignmask;
 552     if(padb)
 553         return(size + m_balign - padb);
 554     else
 555         return(size);
 556 }
 557
 558 /*
 559   Returns the total amount of memory which we need to get from the system
 560   in order to satisfy a caller request. This includes space for the struct
 561   plus markers and the caller's memory as well.
 562 */
 563 size_t wxDebugContext::TotSize (const size_t reqSize)
 564 {
 565     return (PaddedSize (sizeof (wxMemStruct)) + PaddedSize (reqSize) +
 566             2 * sizeof(wxMarkerType));
 567 }
 568
 569
 570 /*
 571   Traverse the list of nodes executing the given function on each node.
 572 */
 573 void wxDebugContext::TraverseList (PmSFV func, wxMemStruct *from)
 574 {
 575   if (!from)
 576     from = wxDebugContext::GetHead ();
 577
 578   wxMemStruct * st = NULL;
 579   for (st = from; st != 0; st = st->m_next)
 580   {
 581       void* data = st->GetActualData();
 582 //      if ((data != (void*)m_debugStream) && (data != (void*) m_streamBuf))
 583       if (data != (void*) wxLog::GetActiveTarget())
 584       {
 585         (st->*func) ();
 586       }
 587   }
 588 }
 589
 590
 591 /*
 592   Print out the list.
 593   */
 594 bool wxDebugContext::PrintList (void)
 595 {
 596 #ifdef __WXDEBUG__
 597   TraverseList ((PmSFV)&wxMemStruct::PrintNode, (checkPoint ? checkPoint->m_next : (wxMemStruct*)NULL));
 598
 599   return TRUE;
 600 #else
 601   return FALSE;
 602 #endif
 603 }
 604
 605 bool wxDebugContext::Dump(void)
 606 {
 607 #ifdef __WXDEBUG__
 608   {
 609     wxChar* appName = (wxChar*) wxT("application");
 610     wxString appNameStr("");
 611     if (wxTheApp)
 612     {
 613         appNameStr = wxTheApp->GetAppName();
 614         appName = WXSTRINGCAST appNameStr;
 615         wxLogMessage(wxT("----- Memory dump of %s at %s -----"), appName, WXSTRINGCAST wxNow() );
 616     }
 617     else
 618     {
 619       wxLogMessage( wxT("----- Memory dump -----") );
 620     }
 621   }
 622
 623   TraverseList ((PmSFV)&wxMemStruct::Dump, (checkPoint ? checkPoint->m_next : (wxMemStruct*)NULL));
 624
 625   wxLogMessage( wxT("") );
 626   wxLogMessage( wxT("") );
 627
 628   return TRUE;
 629 #else
 630   return FALSE;
 631 #endif
 632 }
 633
 634 #ifdef __WXDEBUG__
 635 struct wxDebugStatsStruct
 636 {
 637   long instanceCount;
 638   long totalSize;
 639   wxChar *instanceClass;
 640   wxDebugStatsStruct *next;
 641 };
 642
 643 static wxDebugStatsStruct *FindStatsStruct(wxDebugStatsStruct *st, wxChar *name)
 644 {
 645   while (st)
 646   {
 647     if (wxStrcmp(st->instanceClass, name) == 0)
 648       return st;
 649     st = st->next;
 650   }
 651   return NULL;
 652 }
 653
 654 static wxDebugStatsStruct *InsertStatsStruct(wxDebugStatsStruct *head, wxDebugStatsStruct *st)
 655 {
 656   st->next = head;
 657   return st;
 658 }
 659 #endif
 660
 661 bool wxDebugContext::PrintStatistics(bool detailed)
 662 {
 663 #ifdef __WXDEBUG__
 664   {
 665     wxChar* appName = (wxChar*) wxT("application");
 666     wxString appNameStr(wxT(""));
 667     if (wxTheApp)
 668     {
 669         appNameStr = wxTheApp->GetAppName();
 670         appName = WXSTRINGCAST appNameStr;
 671         wxLogMessage(wxT("----- Memory statistics of %s at %s -----"), appName, WXSTRINGCAST wxNow() );
 672     }
 673     else
 674     {
 675       wxLogMessage( wxT("----- Memory statistics -----") );
 676     }
 677   }
 678
 679   bool currentMode = GetDebugMode();
 680   SetDebugMode(FALSE);
 681
 682   long noNonObjectNodes = 0;
 683   long noObjectNodes = 0;
 684   long totalSize = 0;
 685
 686   wxDebugStatsStruct *list = NULL;
 687
 688   wxMemStruct *from = (checkPoint ? checkPoint->m_next : (wxMemStruct*)NULL );
 689   if (!from)
 690     from = wxDebugContext::GetHead ();
 691
 692   wxMemStruct *st;
 693   for (st = from; st != 0; st = st->m_next)
 694   {
 695     void* data = st->GetActualData();
 696     if (detailed && (data != (void*) wxLog::GetActiveTarget()))
 697     {
 698       wxChar *className = (wxChar*) wxT("nonobject");
 699       if (st->m_isObject && st->GetActualData())
 700       {
 701         wxObject *obj = (wxObject *)st->GetActualData();
 702         if (obj->GetClassInfo()->GetClassName())
 703           className = (wxChar*)obj->GetClassInfo()->GetClassName();
 704       }
 705       wxDebugStatsStruct *stats = FindStatsStruct(list, className);
 706       if (!stats)
 707       {
 708         stats = (wxDebugStatsStruct *)malloc(sizeof(wxDebugStatsStruct));
 709         stats->instanceClass = className;
 710         stats->instanceCount = 0;
 711         stats->totalSize = 0;
 712         list = InsertStatsStruct(list, stats);
 713       }
 714       stats->instanceCount ++;
 715       stats->totalSize += st->RequestSize();
 716     }
 717
 718     if (data != (void*) wxLog::GetActiveTarget())
 719     {
 720         totalSize += st->RequestSize();
 721         if (st->m_isObject)
 722             noObjectNodes ++;
 723         else
 724             noNonObjectNodes ++;
 725     }
 726   }
 727
 728   if (detailed)
 729   {
 730     while (list)
 731     {
 732       wxLogMessage(wxT("%ld objects of class %s, total size %ld"),
 733           list->instanceCount, list->instanceClass, list->totalSize);
 734       wxDebugStatsStruct *old = list;
 735       list = old->next;
 736       free((char *)old);
 737     }
 738     wxLogMessage(wxT(""));
 739   }
 740
 741   SetDebugMode(currentMode);
 742
 743   wxLogMessage(wxT("Number of object items: %ld"), noObjectNodes);
 744   wxLogMessage(wxT("Number of non-object items: %ld"), noNonObjectNodes);
 745   wxLogMessage(wxT("Total allocated size: %ld"), totalSize);
 746   wxLogMessage(wxT(""));
 747   wxLogMessage(wxT(""));
 748
 749   return TRUE;
 750 #else
 751   (void)detailed;
 752   return FALSE;
 753 #endif
 754 }
 755
 756 bool wxDebugContext::PrintClasses(void)
 757 {
 758   {
 759     wxChar* appName = (wxChar*) wxT("application");
 760     wxString appNameStr(wxT(""));
 761     if (wxTheApp)
 762     {
 763         appNameStr = wxTheApp->GetAppName();
 764         appName = WXSTRINGCAST appNameStr;
 765         wxLogMessage(wxT("----- Classes in %s -----"), appName);
 766     }
 767   }
 768
 769   int n = 0;
 770   wxNode *node;
 771   wxClassInfo *info;
 772
 773   wxClassInfo::sm_classTable->BeginFind();
 774   node = wxClassInfo::sm_classTable->Next();
 775   while (node)
 776   {
 777     info = (wxClassInfo *)node->Data();
 778     if (info->GetClassName())
 779     {
 780         wxString msg(info->GetClassName());
 781         msg += wxT(" ");
 782
 783         if (info->GetBaseClassName1() && !info->GetBaseClassName2())
 784         {
 785             msg += wxT("is a ");
 786             msg += info->GetBaseClassName1();
 787         }
 788         else if (info->GetBaseClassName1() && info->GetBaseClassName2())
 789         {
 790             msg += wxT("is a ");
 791             msg += info->GetBaseClassName1() ;
 792             msg += wxT(", ");
 793             msg += info->GetBaseClassName2() ;
 794         }
 795         if (info->GetConstructor())
 796             msg += wxT(": dynamic");
 797
 798         wxLogMessage(msg);
 799     }
 800     node = wxClassInfo::sm_classTable->Next();
 801     n ++;
 802   }
 803   wxLogMessage(wxT(""));
 804   wxLogMessage(wxT("There are %d classes derived from wxObject."), n);
 805   wxLogMessage(wxT(""));
 806   wxLogMessage(wxT(""));
 807   return TRUE;
 808 }
 809
 810 void wxDebugContext::SetCheckpoint(bool all)
 811 {
 812   if (all)
 813     checkPoint = NULL;
 814   else
 815     checkPoint = m_tail;
 816 }
 817
 818 // Checks all nodes since checkpoint, or since start.
 819 int wxDebugContext::Check(bool checkAll)
 820 {
 821   int nFailures = 0;
 822
 823   wxMemStruct *from = (checkPoint ? checkPoint->m_next : (wxMemStruct*)NULL );
 824   if (!from || checkAll)
 825     from = wxDebugContext::GetHead ();
 826
 827   for (wxMemStruct * st = from; st != 0; st = st->m_next)
 828   {
 829     if (st->AssertIt ())
 830       nFailures += st->CheckBlock ();
 831     else
 832       return -1;
 833   }
 834
 835   return nFailures;
 836 }
 837
 838 // Count the number of non-wxDebugContext-related objects
 839 // that are outstanding
 840 int wxDebugContext::CountObjectsLeft(bool sinceCheckpoint)
 841 {
 842   int n = 0;
 843
 844   wxMemStruct *from = NULL;
 845   if (sinceCheckpoint && checkPoint)
 846     from = checkPoint->m_next;
 847   else
 848     from = wxDebugContext::GetHead () ;
 849
 850   for (wxMemStruct * st = from; st != 0; st = st->m_next)
 851   {
 852       void* data = st->GetActualData();
 853       if (data != (void*) wxLog::GetActiveTarget())
 854           n ++;
 855   }
 856
 857   return n ;
 858 }
 859
 860 #if USE_THREADSAFE_MEMORY_ALLOCATION
 861 static bool memSectionOk = FALSE;
 862
 863 class MemoryCriticalSection : public wxCriticalSection
 864 {
 865 public:
 866         MemoryCriticalSection() {
 867                 memSectionOk = TRUE;
 868         }
 869 };
 870
 871 class MemoryCriticalSectionLocker
 872 {
 873 public:
 874     inline MemoryCriticalSectionLocker(wxCriticalSection& critsect)
 875         : m_critsect(critsect), m_locked(memSectionOk) { if(m_locked) m_critsect.Enter(); }
 876     inline ~MemoryCriticalSectionLocker() { if(m_locked) m_critsect.Leave(); }
 877
 878 private:
 879     // no assignment operator nor copy ctor
 880     MemoryCriticalSectionLocker(const MemoryCriticalSectionLocker&);
 881     MemoryCriticalSectionLocker& operator=(const MemoryCriticalSectionLocker&);
 882
 883     wxCriticalSection& m_critsect;
 884         bool    m_locked;
 885 };
 886
 887 static MemoryCriticalSection memLocker;
 888 #endif
 889
 890 // TODO: store whether this is a vector or not.
 891 void * wxDebugAlloc(size_t size, wxChar * fileName, int lineNum, bool isObject, bool WXUNUSED(isVect) )
 892 {
 893 #if USE_THREADSAFE_MEMORY_ALLOCATION
 894   MemoryCriticalSectionLocker lock(memLocker);
 895 #endif
 896
 897   // If not in debugging allocation mode, do the normal thing
 898   // so we don't leave any trace of ourselves in the node list.
 899
 900 #if defined(__VISAGECPP__) && (__IBMCPP__ < 400 || __IBMC__ < 400 )
 901 // VA 3.0 still has trouble in here
 902   return (void *)malloc(size);
 903 #endif
 904   if (!wxDebugContext::GetDebugMode())
 905   {
 906     return (void *)malloc(size);
 907   }
 908
 909     int totSize = wxDebugContext::TotSize (size);
 910     char * buf = (char *) malloc(totSize);
 911     if (!buf) {
 912         wxLogMessage(wxT("Call to malloc (%ld) failed."), (long)size);
 913         return 0;
 914     }
 915     wxMemStruct * st = (wxMemStruct *)buf;
 916     st->m_firstMarker = MemStartCheck;
 917     st->m_reqSize = size;
 918     st->m_fileName = fileName;
 919     st->m_lineNum = lineNum;
 920     st->m_id = MemStructId;
 921     st->m_prev = 0;
 922     st->m_next = 0;
 923     st->m_isObject = isObject;
 924
 925     // Errors from Append() shouldn't really happen - but just in case!
 926     if (st->Append () == 0) {
 927         st->ErrorMsg ("Trying to append new node");
 928     }
 929
 930     if (wxDebugContext::GetCheckPrevious ()) {
 931         if (st->CheckAllPrevious () < 0) {
 932             st->ErrorMsg ("Checking previous nodes");
 933         }
 934     }
 935
 936     // Set up the extra markers at the middle and end.
 937     char * ptr = wxDebugContext::MidMarkerPos (buf);
 938     * (wxMarkerType *) ptr = MemMidCheck;
 939     ptr = wxDebugContext::EndMarkerPos (buf, size);
 940     * (wxMarkerType *) ptr = MemEndCheck;
 941
 942     // pointer returned points to the start of the caller's
 943     // usable area.
 944     void *m_actualData = (void *) wxDebugContext::CallerMemPos (buf);
 945     st->m_actualData = m_actualData;
 946
 947     return m_actualData;
 948 }
 949
 950 // TODO: check whether was allocated as a vector
 951 void wxDebugFree(void * buf, bool WXUNUSED(isVect) )
 952 {
 953 #if USE_THREADSAFE_MEMORY_ALLOCATION
 954   MemoryCriticalSectionLocker lock(memLocker);
 955 #endif
 956
 957   if (!buf)
 958     return;
 959
 960 #if defined(__VISAGECPP__) && (__IBMCPP__ < 400 || __IBMC__ < 400 )
 961 // VA 3.0 still has trouble in here
 962   free((char *)buf);
 963 #endif
 964   // If not in debugging allocation mode, do the normal thing
 965   // so we don't leave any trace of ourselves in the node list.
 966   if (!wxDebugContext::GetDebugMode())
 967   {
 968     free((char *)buf);
 969     return;
 970   }
 971
 972     // Points to the start of the entire allocated area.
 973     char * startPointer = wxDebugContext::StartPos ((char *) buf);
 974     // Find the struct and make sure that it's identifiable.
 975     wxMemStruct * st = (wxMemStruct *) wxDebugContext::StructPos (startPointer);
 976
 977     if (! st->ValidateNode ())
 978         return;
 979
 980     // If this is the current checkpoint, we need to
 981     // move the checkpoint back so it points to a valid
 982     // node.
 983     if (st == wxDebugContext::checkPoint)
 984       wxDebugContext::checkPoint = wxDebugContext::checkPoint->m_prev;
 985
 986     if (! st->Unlink ())
 987     {
 988       st->ErrorMsg ("Unlinking deleted node");
 989     }
 990
 991     // Now put in the fill char into the id slot and the caller requested
 992     // memory locations.
 993     st->SetDeleted ();
 994     (void) memset (wxDebugContext::CallerMemPos (startPointer), MemFillChar,
 995                    st->RequestSize ());
 996
 997     free((char *)st);
 998 }
 999
1000 // Trace: send output to the current debugging stream
1001 void wxTrace(const wxChar * ...)
1002 {
1003 #if 1
1004     wxFAIL_MSG(wxT("wxTrace is now obsolete. Please use wxDebugXXX instead."));
1005 #else
1006     va_list ap;
1007   static wxChar buffer[512];
1008
1009   va_start(ap, fmt);
1010
1011 #ifdef __WXMSW__
1012   wvsprintf(buffer,fmt,ap) ;
1013 #else
1014   vsprintf(buffer,fmt,ap) ;
1015 #endif
1016
1017   va_end(ap);
1018
1019   if (wxDebugContext::HasStream())
1020   {
1021     wxDebugContext::GetStream() << buffer;
1022     wxDebugContext::GetStream().flush();
1023   }
1024   else
1025 #ifdef __WXMSW__
1026 #ifdef __WIN32__
1027     OutputDebugString((LPCTSTR)buffer) ;
1028 #else
1029     OutputDebugString((const char*) buffer) ;
1030 #endif
1031 #else
1032     fprintf(stderr, buffer);
1033 #endif
1034 #endif
1035 }
1036
1037 // Trace with level
1038 void wxTraceLevel(int, const wxChar * ...)
1039 {
1040 #if 1
1041     wxFAIL_MSG(wxT("wxTrace is now obsolete. Please use wxDebugXXX instead."));
1042 #else
1043   if (wxDebugContext::GetLevel() < level)
1044     return;
1045
1046   va_list ap;
1047   static wxChar buffer[512];
1048
1049   va_start(ap, fmt);
1050
1051 #ifdef __WXMSW__
1052   wxWvsprintf(buffer,fmt,ap) ;
1053 #else
1054   vsprintf(buffer,fmt,ap) ;
1055 #endif
1056
1057   va_end(ap);
1058
1059   if (wxDebugContext::HasStream())
1060   {
1061     wxDebugContext::GetStream() << buffer;
1062     wxDebugContext::GetStream().flush();
1063   }
1064   else
1065 #ifdef __WXMSW__
1066 #ifdef __WIN32__
1067     OutputDebugString((LPCTSTR)buffer) ;
1068 #else
1069     OutputDebugString((const char*) buffer) ;
1070 #endif
1071 #else
1072     fprintf(stderr, buffer);
1073 #endif
1074 #endif
1075 }
1076
1077 #else // wxUSE_MEMORY_TRACING && defined(__WXDEBUG__)
1078 void wxTrace(const char *WXUNUSED(fmt) ...)
1079 {
1080 }
1081
1082 void wxTraceLevel(int WXUNUSED(level), const char *WXUNUSED(fmt) ...)
1083 {
1084 }
1085 #endif
1086