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 #include "wx/ioswrap.h"
  42
  43 #if wxUSE_IOSTREAMH
  44     #include <fstream.h>
  45 #else
  46     #include <fstream>
  47 #endif
  48
  49 #if !defined(__WATCOMC__) && !(defined(__VMS__) && ( __VMS_VER < 70000000 ) )\
  50      && !defined( __MWERKS__ ) && !defined(__SALFORDC__)
  51 #include <memory.h>
  52 #endif
  53
  54 #include <stdarg.h>
  55 #include <string.h>
  56
  57 #ifdef __WXMSW__
  58 #include <windows.h>
  59
  60 #ifdef GetClassInfo
  61 #undef GetClassInfo
  62 #endif
  63
  64 #ifdef GetClassName
  65 #undef GetClassName
  66 #endif
  67
  68 #endif
  69
  70 #include "wx/memory.h"
  71
  72 #ifdef new
  73 #undef new
  74 #endif
  75
  76 // wxDebugContext wxTheDebugContext;
  77 /*
  78   Redefine new and delete so that we can pick up situations where:
  79         - we overwrite or underwrite areas of malloc'd memory.
  80         - we use uninitialise variables
  81   Only do this in debug mode.
  82
  83   We change new to get enough memory to allocate a struct, followed
  84   by the caller's requested memory, followed by a tag. The struct
  85   is used to create a doubly linked list of these areas and also
  86   contains another tag. The tags are used to determine when the area
  87   has been over/under written.
  88 */
  89
  90
  91 /*
  92   Values which are used to set the markers which will be tested for
  93   under/over write. There are 3 of these, one in the struct, one
  94   immediately after the struct but before the caller requested memory and
  95   one immediately after the requested memory.
  96 */
  97 #define MemStartCheck  0x23A8
  98 #define MemMidCheck  0xA328
  99 #define MemEndCheck 0x8A32
 100 #define MemFillChar 0xAF
 101 #define MemStructId  0x666D
 102
 103 /*
 104   External interface for the wxMemStruct class. Others are
 105   defined inline within the class def. Here we only need to be able
 106   to add and delete nodes from the list and handle errors in some way.
 107 */
 108
 109 /*
 110   Used for internal "this shouldn't happen" type of errors.
 111 */
 112 void wxMemStruct::ErrorMsg (const char * mesg)
 113 {
 114   wxLogDebug(wxT("wxWindows memory checking error: %s"), mesg);
 115   PrintNode ();
 116
 117 //         << m_fileName << ' ' << m_lineNum << endl;
 118 }
 119
 120 /*
 121   Used when we find an overwrite or an underwrite error.
 122 */
 123 void wxMemStruct::ErrorMsg ()
 124 {
 125   wxLogDebug(wxT("wxWindows over/underwrite memory error:"));
 126   PrintNode ();
 127
 128 //    cerr << m_fileName << ' ' << m_lineNum << endl;
 129 }
 130
 131
 132 /*
 133   We want to find out if pointers have been overwritten as soon as is
 134   possible, so test everything before we dereference it. Of course it's still
 135   quite possible that, if things have been overwritten, this function will
 136   fall over, but the only way of dealing with that would cost too much in terms
 137   of time.
 138 */
 139 int wxMemStruct::AssertList ()
 140 {
 141     if (wxDebugContext::GetHead () != 0 && ! (wxDebugContext::GetHead ())->AssertIt () ||
 142         wxDebugContext::GetTail () != 0 && ! wxDebugContext::GetTail ()->AssertIt ()) {
 143         ErrorMsg ("Head or tail pointers trashed");
 144         return 0;
 145     }
 146     return 1;
 147 }
 148
 149
 150 /*
 151   Check that the thing we're pointing to has the correct id for a wxMemStruct
 152   object and also that it's previous and next pointers are pointing at objects
 153   which have valid ids.
 154   This is definitely not perfect since we could fall over just trying to access
 155   any of the slots which we use here, but I think it's about the best that I
 156   can do without doing something like taking all new wxMemStruct pointers and
 157   comparing them against all known pointer within the list and then only
 158   doing this sort of check _after_ you've found the pointer in the list. That
 159   would be safer, but also much more time consuming.
 160 */
 161 int wxMemStruct::AssertIt ()
 162 {
 163     return (m_id == MemStructId &&
 164             (m_prev == 0 || m_prev->m_id == MemStructId) &&
 165             (m_next == 0 || m_next->m_id == MemStructId));
 166 }
 167
 168
 169 /*
 170   Additions are always at the tail of the list.
 171   Returns 0 on error, non-zero on success.
 172 */
 173 int wxMemStruct::Append ()
 174 {
 175     if (! AssertList ())
 176         return 0;
 177
 178     if (wxDebugContext::GetHead () == 0) {
 179         if (wxDebugContext::GetTail () != 0) {
 180             ErrorMsg ("Null list should have a null tail pointer");
 181             return 0;
 182         }
 183         (void) wxDebugContext::SetHead (this);
 184         (void) wxDebugContext::SetTail (this);
 185     } else {
 186         wxDebugContext::GetTail ()->m_next = this;
 187         this->m_prev = wxDebugContext::GetTail ();
 188         (void) wxDebugContext::SetTail (this);
 189     }
 190     return 1;
 191 }
 192
 193
 194 /*
 195   Don't actually free up anything here as the space which is used
 196   by the node will be free'd up when the whole block is free'd.
 197   Returns 0 on error, non-zero on success.
 198 */
 199 int wxMemStruct::Unlink ()
 200 {
 201     if (! AssertList ())
 202         return 0;
 203
 204     if (wxDebugContext::GetHead () == 0 || wxDebugContext::GetTail () == 0) {
 205         ErrorMsg ("Trying to remove node from empty list");
 206         return 0;
 207     }
 208
 209     // Handle the part of the list before this node.
 210     if (m_prev == 0) {
 211         if (this != wxDebugContext::GetHead ()) {
 212             ErrorMsg ("No previous node for non-head node");
 213             return 0;
 214         }
 215         (void) wxDebugContext::SetHead (m_next);
 216     } else {
 217         if (! m_prev->AssertIt ()) {
 218             ErrorMsg ("Trashed previous pointer");
 219             return 0;
 220         }
 221
 222         if (m_prev->m_next != this) {
 223             ErrorMsg ("List is inconsistent");
 224             return 0;
 225         }
 226         m_prev->m_next = m_next;
 227     }
 228
 229     // Handle the part of the list after this node.
 230     if (m_next == 0) {
 231         if (this != wxDebugContext::GetTail ()) {
 232             ErrorMsg ("No next node for non-tail node");
 233             return 0;
 234         }
 235         (void) wxDebugContext::SetTail (m_prev);
 236     } else {
 237         if (! m_next->AssertIt ()) {
 238             ErrorMsg ("Trashed next pointer");
 239             return 0;
 240         }
 241
 242         if (m_next->m_prev != this) {
 243             ErrorMsg ("List is inconsistent");
 244             return 0;
 245         }
 246         m_next->m_prev = m_prev;
 247     }
 248
 249     return 1;
 250 }
 251
 252
 253
 254 /*
 255   Checks a node and block of memory to see that the markers are still
 256   intact.
 257 */
 258 int wxMemStruct::CheckBlock ()
 259 {
 260     int nFailures = 0;
 261
 262     if (m_firstMarker != MemStartCheck) {
 263         nFailures++;
 264         ErrorMsg ();
 265     }
 266
 267     char * pointer = wxDebugContext::MidMarkerPos ((char *) this);
 268     if (* (wxMarkerType *) pointer != MemMidCheck) {
 269         nFailures++;
 270         ErrorMsg ();
 271     }
 272
 273     pointer = wxDebugContext::EndMarkerPos ((char *) this, RequestSize ());
 274     if (* (wxMarkerType *) pointer != MemEndCheck) {
 275         nFailures++;
 276         ErrorMsg ();
 277     }
 278
 279     return nFailures;
 280 }
 281
 282
 283 /*
 284   Check the list of nodes to see if they are all ok.
 285 */
 286 int wxMemStruct::CheckAllPrevious ()
 287 {
 288     int nFailures = 0;
 289
 290     for (wxMemStruct * st = this->m_prev; st != 0; st = st->m_prev) {
 291         if (st->AssertIt ())
 292             nFailures += st->CheckBlock ();
 293         else
 294             return -1;
 295     }
 296
 297     return nFailures;
 298 }
 299
 300
 301 /*
 302   When we delete a node we set the id slot to a specific value and then test
 303   against this to see if a nodes have been deleted previously. I don't
 304   just set the entire memory to the fillChar because then I'd be overwriting
 305   useful stuff like the vtbl which may be needed to output the error message
 306   including the file name and line numbers. Without this info the whole point
 307   of this class is lost!
 308 */
 309 void wxMemStruct::SetDeleted ()
 310 {
 311     m_id = MemFillChar;
 312 }
 313
 314 int wxMemStruct::IsDeleted ()
 315 {
 316     return (m_id == MemFillChar);
 317 }
 318
 319
 320 /*
 321   Print out a single node. There are many far better ways of doing this
 322   but this will suffice for now.
 323 */
 324 void wxMemStruct::PrintNode ()
 325 {
 326   if (m_isObject)
 327   {
 328     wxObject *obj = (wxObject *)m_actualData;
 329     wxClassInfo *info = obj->GetClassInfo();
 330
 331     // Let's put this in standard form so IDEs can load the file at the appropriate
 332     // line
 333     wxString msg(wxT(""));
 334
 335     if (m_fileName)
 336       msg.Printf(wxT("%s(%d): "), m_fileName, (int)m_lineNum);
 337
 338     if (info && info->GetClassName())
 339       msg += info->GetClassName();
 340     else
 341       msg += wxT("object");
 342
 343     wxString msg2;
 344     msg2.Printf(wxT(" at $%lX, size %d"), (long)GetActualData(), (int)RequestSize());
 345     msg += msg2;
 346
 347     wxLogDebug(msg);
 348   }
 349   else
 350   {
 351     wxString msg("");
 352
 353     if (m_fileName)
 354       msg.Printf(wxT("%s(%d): "), m_fileName, (int)m_lineNum);
 355     msg += wxT("non-object data");
 356     wxString msg2;
 357     msg2.Printf(wxT(" at $%lX, size %d\n"), (long)GetActualData(), (int)RequestSize());
 358     msg += msg2;
 359
 360     wxLogDebug(msg);
 361   }
 362 }
 363
 364 void wxMemStruct::Dump ()
 365 {
 366   if (!ValidateNode()) return;
 367
 368   if (m_isObject)
 369   {
 370     wxObject *obj = (wxObject *)m_actualData;
 371
 372     wxString msg(wxT(""));
 373     if (m_fileName)
 374       msg.Printf(wxT("%s(%d): "), m_fileName, (int)m_lineNum);
 375
 376
 377     /* TODO: We no longer have a stream (using wxLogDebug) so we can't dump it.
 378      * Instead, do what wxObject::Dump does.
 379      * What should we do long-term, eliminate Dumping? Or specify
 380      * that MyClass::Dump should use wxLogDebug? Ugh.
 381     obj->Dump(wxDebugContext::GetStream());
 382      */
 383
 384     if (obj->GetClassInfo() && obj->GetClassInfo()->GetClassName())
 385       msg += obj->GetClassInfo()->GetClassName();
 386     else
 387       msg += wxT("unknown object class");
 388
 389     wxString msg2("");
 390     msg2.Printf(wxT(" at $%lX, size %d"), (long)GetActualData(), (int)RequestSize());
 391     msg += msg2;
 392
 393     wxLogDebug(msg);
 394   }
 395   else
 396   {
 397     wxString msg(wxT(""));
 398     if (m_fileName)
 399       msg.Printf(wxT("%s(%d): "), m_fileName, (int)m_lineNum);
 400
 401     wxString msg2("");
 402     msg2.Printf(wxT("non-object data at $%lX, size %d"), (long)GetActualData(), (int)RequestSize() );
 403     msg += msg2;
 404     wxLogDebug(msg);
 405   }
 406 }
 407
 408
 409 /*
 410   Validate a node. Check to see that the node is "clean" in the sense
 411   that nothing has over/underwritten it etc.
 412 */
 413 int wxMemStruct::ValidateNode ()
 414 {
 415     char * startPointer = (char *) this;
 416     if (!AssertIt ()) {
 417         if (IsDeleted ())
 418             ErrorMsg ("Object already deleted");
 419         else {
 420             // Can't use the error routines as we have no recognisable object.
 421 #ifndef __WXGTK__
 422              wxLogDebug(wxT("Can't verify memory struct - all bets are off!"));
 423 #endif
 424         }
 425         return 0;
 426     }
 427
 428 /*
 429     int i;
 430     for (i = 0; i < wxDebugContext::TotSize (requestSize ()); i++)
 431       cout << startPointer [i];
 432     cout << endl;
 433 */
 434     if (Marker () != MemStartCheck)
 435       ErrorMsg ();
 436     if (* (wxMarkerType *) wxDebugContext::MidMarkerPos (startPointer) != MemMidCheck)
 437       ErrorMsg ();
 438     if (* (wxMarkerType *) wxDebugContext::EndMarkerPos (startPointer,
 439                                               RequestSize ()) !=
 440         MemEndCheck)
 441       ErrorMsg ();
 442
 443     // Back to before the extra buffer and check that
 444     // we can still read what we originally wrote.
 445     if (Marker () != MemStartCheck ||
 446         * (wxMarkerType *) wxDebugContext::MidMarkerPos (startPointer)
 447                          != MemMidCheck ||
 448         * (wxMarkerType *) wxDebugContext::EndMarkerPos (startPointer,
 449                                               RequestSize ()) != MemEndCheck)
 450     {
 451         ErrorMsg ();
 452         return 0;
 453     }
 454
 455     return 1;
 456 }
 457
 458 /*
 459   The wxDebugContext class.
 460 */
 461
 462 wxMemStruct *wxDebugContext::m_head = NULL;
 463 wxMemStruct *wxDebugContext::m_tail = NULL;
 464 // ostream *wxDebugContext::m_debugStream = NULL;
 465 // streambuf *wxDebugContext::m_streamBuf = NULL;
 466
 467 // Must initialise these in wxEntry, and then delete them just before wxEntry exits
 468 streambuf *wxDebugContext::m_streamBuf = NULL;
 469 ostream *wxDebugContext::m_debugStream = NULL;
 470
 471 bool wxDebugContext::m_checkPrevious = FALSE;
 472 int wxDebugContext::debugLevel = 1;
 473 bool wxDebugContext::debugOn = TRUE;
 474 wxMemStruct *wxDebugContext::checkPoint = NULL;
 475
 476 wxDebugContext::wxDebugContext(void)
 477 {
 478 //  m_streamBuf = new wxDebugStreamBuf;
 479 //  m_debugStream = new ostream(m_streamBuf);
 480 }
 481
 482 wxDebugContext::~wxDebugContext(void)
 483 {
 484   SetStream(NULL, NULL);
 485 }
 486
 487 /*
 488  * It's bizarre, but with BC++ 4.5, the value of str changes
 489  * between SetFile and SetStream.
 490  */
 491
 492 void wxDebugContext::SetStream(ostream *str, streambuf *buf)
 493 {
 494   if (m_debugStream)
 495   {
 496     m_debugStream->flush();
 497     delete m_debugStream;
 498   }
 499   m_debugStream = NULL;
 500
 501   // Not allowed in Watcom (~streambuf is protected).
 502   // Is this trying to say something significant to us??
 503 #ifndef __WATCOMC__
 504   if (m_streamBuf)
 505   {
 506     streambuf* oldBuf = m_streamBuf;
 507     m_streamBuf = NULL;
 508     delete oldBuf;
 509   }
 510 #endif
 511   m_streamBuf = buf;
 512   m_debugStream = str;
 513 }
 514
 515 bool wxDebugContext::SetFile(const wxString& file)
 516 {
 517   ofstream *str = new ofstream(file.fn_str());
 518
 519   if (str->bad())
 520   {
 521     delete str;
 522     return FALSE;
 523   }
 524   else
 525   {
 526     SetStream(str);
 527     return TRUE;
 528   }
 529 }
 530
 531 bool wxDebugContext::SetStandardError(void)
 532 {
 533     // Obsolete
 534 #if 0
 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 #endif
 544   return FALSE;
 545 }
 546
 547
 548 /*
 549   Work out the positions of the markers by creating an array of 2 markers
 550   and comparing the addresses of the 2 elements. Use this number as the
 551   alignment for markers.
 552 */
 553 size_t wxDebugContext::CalcAlignment ()
 554 {
 555     wxMarkerType ar[2];
 556     return (char *) &ar[1] - (char *) &ar[0];
 557 }
 558
 559
 560 char * wxDebugContext::StructPos (const char * buf)
 561 {
 562     return (char *) buf;
 563 }
 564
 565 char * wxDebugContext::MidMarkerPos (const char * buf)
 566 {
 567     return StructPos (buf) + PaddedSize (sizeof (wxMemStruct));
 568 }
 569
 570 char * wxDebugContext::CallerMemPos (const char * buf)
 571 {
 572     return MidMarkerPos (buf) + PaddedSize (sizeof(wxMarkerType));
 573 }
 574
 575
 576 char * wxDebugContext::EndMarkerPos (const char * buf, const size_t size)
 577 {
 578     return CallerMemPos (buf) + PaddedSize (size);
 579 }
 580
 581
 582 /*
 583   Slightly different as this takes a pointer to the start of the caller
 584   requested region and returns a pointer to the start of the buffer.
 585   */
 586 char * wxDebugContext::StartPos (const char * caller)
 587 {
 588     return ((char *) (caller - wxDebugContext::PaddedSize (sizeof(wxMarkerType)) -
 589             wxDebugContext::PaddedSize (sizeof (wxMemStruct))));
 590 }
 591
 592 /*
 593   We may need padding between various parts of the allocated memory.
 594   Given a size of memory, this returns the amount of memory which should
 595   be allocated in order to allow for alignment of the following object.
 596
 597   I don't know how portable this stuff is, but it seems to work for me at
 598   the moment. It would be real nice if I knew more about this!
 599 */
 600 size_t wxDebugContext::GetPadding (const size_t size)
 601 {
 602     size_t pad = size % CalcAlignment ();
 603     return (pad) ? sizeof(wxMarkerType) - pad : 0;
 604 }
 605
 606
 607
 608 size_t wxDebugContext::PaddedSize (const size_t size)
 609 {
 610     return size + GetPadding (size);
 611 }
 612
 613 /*
 614   Returns the total amount of memory which we need to get from the system
 615   in order to satisfy a caller request. This includes space for the struct
 616   plus markers and the caller's memory as well.
 617 */
 618 size_t wxDebugContext::TotSize (const size_t reqSize)
 619 {
 620     return (PaddedSize (sizeof (wxMemStruct)) + PaddedSize (reqSize) +
 621             2 * sizeof(wxMarkerType));
 622 }
 623
 624
 625 /*
 626   Traverse the list of nodes executing the given function on each node.
 627 */
 628 void wxDebugContext::TraverseList (PmSFV func, wxMemStruct *from)
 629 {
 630   if (!from)
 631     from = wxDebugContext::GetHead ();
 632
 633   for (wxMemStruct * st = from; st != 0; st = st->m_next)
 634   {
 635       void* data = st->GetActualData();
 636 //      if ((data != (void*)m_debugStream) && (data != (void*) m_streamBuf))
 637       if (data != (void*) wxLog::GetActiveTarget())
 638       {
 639         (st->*func) ();
 640       }
 641   }
 642 }
 643
 644
 645 /*
 646   Print out the list.
 647   */
 648 bool wxDebugContext::PrintList (void)
 649 {
 650 #ifdef __WXDEBUG__
 651 //  if (!HasStream())
 652 //    return FALSE;
 653
 654   TraverseList ((PmSFV)&wxMemStruct::PrintNode, (checkPoint ? checkPoint->m_next : (wxMemStruct*)NULL));
 655
 656   return TRUE;
 657 #else
 658   return FALSE;
 659 #endif
 660 }
 661
 662 bool wxDebugContext::Dump(void)
 663 {
 664 #ifdef __WXDEBUG__
 665 //  if (!HasStream())
 666 //    return FALSE;
 667
 668 //  if (TRUE)
 669   {
 670     wxChar* appName = wxT("application");
 671     wxString appNameStr("");
 672     if (wxTheApp)
 673     {
 674         appNameStr = wxTheApp->GetAppName();
 675         appName = WXSTRINGCAST appNameStr;
 676         wxLogDebug(wxT("----- Memory dump of %s at %s -----"), appName, WXSTRINGCAST wxNow() );
 677     }
 678     else
 679     {
 680       wxLogDebug( wxT("----- Memory dump -----") );
 681     }
 682   }
 683   TraverseList ((PmSFV)&wxMemStruct::Dump, (checkPoint ? checkPoint->m_next : (wxMemStruct*)NULL));
 684
 685   wxLogDebug( wxT("") );
 686   wxLogDebug( wxT("") );
 687
 688   return TRUE;
 689 #else
 690   return FALSE;
 691 #endif
 692 }
 693
 694 struct wxDebugStatsStruct
 695 {
 696   long instanceCount;
 697   long totalSize;
 698   wxChar *instanceClass;
 699   wxDebugStatsStruct *next;
 700 };
 701
 702 static wxDebugStatsStruct *FindStatsStruct(wxDebugStatsStruct *st, wxChar *name)
 703 {
 704   while (st)
 705   {
 706     if (wxStrcmp(st->instanceClass, name) == 0)
 707       return st;
 708     st = st->next;
 709   }
 710   return NULL;
 711 }
 712
 713 static wxDebugStatsStruct *InsertStatsStruct(wxDebugStatsStruct *head, wxDebugStatsStruct *st)
 714 {
 715   st->next = head;
 716   return st;
 717 }
 718
 719 bool wxDebugContext::PrintStatistics(bool detailed)
 720 {
 721 #ifdef __WXDEBUG__
 722 //  if (!HasStream())
 723 //    return FALSE;
 724
 725 //  if (TRUE)
 726   {
 727     wxChar* appName = wxT("application");
 728     wxString appNameStr(wxT(""));
 729     if (wxTheApp)
 730     {
 731         appNameStr = wxTheApp->GetAppName();
 732         appName = WXSTRINGCAST appNameStr;
 733         wxLogDebug(wxT("----- Memory statistics of %s at %s -----"), appName, WXSTRINGCAST wxNow() );
 734     }
 735     else
 736     {
 737       wxLogDebug( wxT("----- Memory statistics -----") );
 738     }
 739   }
 740
 741   bool currentMode = GetDebugMode();
 742   SetDebugMode(FALSE);
 743
 744   long noNonObjectNodes = 0;
 745   long noObjectNodes = 0;
 746   long totalSize = 0;
 747
 748   wxDebugStatsStruct *list = NULL;
 749
 750   wxMemStruct *from = (checkPoint ? checkPoint->m_next : (wxMemStruct*)NULL );
 751   if (!from)
 752     from = wxDebugContext::GetHead ();
 753
 754   wxMemStruct *st;
 755   for (st = from; st != 0; st = st->m_next)
 756   {
 757     void* data = st->GetActualData();
 758 //    if (detailed && (data != (void*)m_debugStream) && (data != (void*) m_streamBuf))
 759       if (detailed && (data != (void*) wxLog::GetActiveTarget()))
 760     {
 761       wxChar *className = wxT("nonobject");
 762       if (st->m_isObject && st->GetActualData())
 763       {
 764         wxObject *obj = (wxObject *)st->GetActualData();
 765         if (obj->GetClassInfo()->GetClassName())
 766           className = obj->GetClassInfo()->GetClassName();
 767       }
 768       wxDebugStatsStruct *stats = FindStatsStruct(list, className);
 769       if (!stats)
 770       {
 771         stats = (wxDebugStatsStruct *)malloc(sizeof(wxDebugStatsStruct));
 772         stats->instanceClass = className;
 773         stats->instanceCount = 0;
 774         stats->totalSize = 0;
 775         list = InsertStatsStruct(list, stats);
 776       }
 777       stats->instanceCount ++;
 778       stats->totalSize += st->RequestSize();
 779     }
 780
 781 //    if ((data != (void*)m_debugStream) && (data != (void*) m_streamBuf))
 782     if (data != (void*) wxLog::GetActiveTarget())
 783     {
 784         totalSize += st->RequestSize();
 785         if (st->m_isObject)
 786             noObjectNodes ++;
 787         else
 788             noNonObjectNodes ++;
 789     }
 790   }
 791
 792   if (detailed)
 793   {
 794     while (list)
 795     {
 796       wxLogDebug(wxT("%ld objects of class %s, total size %ld"),
 797           list->instanceCount, list->instanceClass, list->totalSize);
 798       wxDebugStatsStruct *old = list;
 799       list = old->next;
 800       free((char *)old);
 801     }
 802     wxLogDebug(wxT(""));
 803   }
 804
 805   SetDebugMode(currentMode);
 806
 807   wxLogDebug(wxT("Number of object items: %ld"), noObjectNodes);
 808   wxLogDebug(wxT("Number of non-object items: %ld"), noNonObjectNodes);
 809   wxLogDebug(wxT("Total allocated size: %ld"), totalSize);
 810   wxLogDebug(wxT(""));
 811   wxLogDebug(wxT(""));
 812
 813   return TRUE;
 814 #else
 815   return FALSE;
 816 #endif
 817 }
 818
 819 bool wxDebugContext::PrintClasses(void)
 820 {
 821 //  if (!HasStream())
 822 //    return FALSE;
 823
 824 //  if (TRUE)
 825   {
 826     wxChar* appName = wxT("application");
 827     wxString appNameStr(wxT(""));
 828     if (wxTheApp)
 829     {
 830         appNameStr = wxTheApp->GetAppName();
 831         appName = WXSTRINGCAST appNameStr;
 832         wxLogDebug(wxT("----- Classes in %s -----"), appName);
 833     }
 834   }
 835
 836   int n = 0;
 837   wxNode *node;
 838   wxClassInfo *info;
 839
 840   wxClassInfo::sm_classTable->BeginFind();
 841   node = wxClassInfo::sm_classTable->Next();
 842   while (node)
 843   {
 844     info = (wxClassInfo *)node->Data();
 845     if (info->GetClassName())
 846     {
 847         wxString msg(info->GetClassName());
 848         msg += wxT(" ");
 849
 850         if (info->GetBaseClassName1() && !info->GetBaseClassName2())
 851         {
 852             msg += wxT("is a ");
 853             msg += info->GetBaseClassName1();
 854         }
 855         else if (info->GetBaseClassName1() && info->GetBaseClassName2())
 856         {
 857             msg += wxT("is a ");
 858             msg += info->GetBaseClassName1() ;
 859             msg += wxT(", ");
 860             msg += info->GetBaseClassName2() ;
 861         }
 862         if (info->GetConstructor())
 863             msg += wxT(": dynamic");
 864
 865         wxLogDebug(msg);
 866     }
 867     node = wxClassInfo::sm_classTable->Next();
 868     n ++;
 869   }
 870   wxLogDebug(wxT(""));
 871   wxLogDebug(wxT("There are %d classes derived from wxObject."), n);
 872   wxLogDebug(wxT(""));
 873   wxLogDebug(wxT(""));
 874   return TRUE;
 875 }
 876
 877 void wxDebugContext::SetCheckpoint(bool all)
 878 {
 879   if (all)
 880     checkPoint = NULL;
 881   else
 882     checkPoint = m_tail;
 883 }
 884
 885 // Checks all nodes since checkpoint, or since start.
 886 int wxDebugContext::Check(bool checkAll)
 887 {
 888   int nFailures = 0;
 889
 890   wxMemStruct *from = (checkPoint ? checkPoint->m_next : (wxMemStruct*)NULL );
 891   if (!from || checkAll)
 892     from = wxDebugContext::GetHead ();
 893
 894   for (wxMemStruct * st = from; st != 0; st = st->m_next)
 895   {
 896     if (st->AssertIt ())
 897       nFailures += st->CheckBlock ();
 898     else
 899       return -1;
 900   }
 901
 902   return nFailures;
 903 }
 904
 905 // Count the number of non-wxDebugContext-related objects
 906 // that are outstanding
 907 int wxDebugContext::CountObjectsLeft(bool sinceCheckpoint)
 908 {
 909   int n = 0;
 910
 911   wxMemStruct *from = NULL;
 912   if (sinceCheckpoint && checkPoint)
 913     from = checkPoint->m_next;
 914   else
 915     from = wxDebugContext::GetHead () ;
 916
 917   for (wxMemStruct * st = from; st != 0; st = st->m_next)
 918   {
 919       void* data = st->GetActualData();
 920 //      if ((data != (void*)m_debugStream) && (data != (void*) m_streamBuf))
 921       if (data != (void*) wxLog::GetActiveTarget())
 922           n ++;
 923   }
 924
 925   return n ;
 926 }
 927
 928 /*
 929   The global operator new used for everything apart from getting
 930   dynamic storage within this function itself.
 931 */
 932
 933 // We'll only do malloc and free for the moment: leave the interesting
 934 // stuff for the wxObject versions.
 935
 936 #if defined(__WXDEBUG__) && wxUSE_GLOBAL_MEMORY_OPERATORS
 937
 938 #ifdef new
 939 #undef new
 940 #endif
 941
 942 // Seems OK all of a sudden. Maybe to do with linking with multithreaded library?
 943 #if 0 // def __VISUALC__
 944 #define NO_DEBUG_ALLOCATION
 945 #endif
 946
 947 // Unfortunately ~wxDebugStreamBuf doesn't work (VC++ 5) when we enable the debugging
 948 // code. I have no idea why. In BC++ 4.5, we have a similar problem the debug
 949 // stream myseriously changing pointer address between being passed from SetFile to SetStream.
 950 // See docs/msw/issues.txt.
 951 void * operator new (size_t size, wxChar * fileName, int lineNum)
 952 {
 953 #ifdef NO_DEBUG_ALLOCATION
 954   return malloc(size);
 955 #else
 956   return wxDebugAlloc(size, fileName, lineNum, FALSE, FALSE);
 957 #endif
 958 }
 959
 960 // Added JACS 25/11/98
 961 void * operator new (size_t size)
 962 {
 963 #ifdef NO_DEBUG_ALLOCATION
 964   return malloc(size);
 965 #else
 966   return wxDebugAlloc(size, NULL, 0, FALSE);
 967 #endif
 968 }
 969
 970 #if wxUSE_ARRAY_MEMORY_OPERATORS
 971 void * operator new[] (size_t size)
 972 {
 973 #ifdef NO_DEBUG_ALLOCATION
 974   return malloc(size);
 975 #else
 976   return wxDebugAlloc(size, NULL, 0, FALSE, TRUE);
 977 #endif
 978 }
 979 #endif
 980
 981 #if wxUSE_ARRAY_MEMORY_OPERATORS
 982 void * operator new[] (size_t size, wxChar * fileName, int lineNum)
 983 {
 984 #ifdef NO_DEBUG_ALLOCATION
 985   return malloc(size);
 986 #else
 987   return wxDebugAlloc(size, fileName, lineNum, FALSE, TRUE);
 988 #endif
 989 }
 990 #endif
 991
 992 #if !defined(__VISAGECPP__) // already defines this by default
 993 void operator delete (void * buf)
 994 {
 995 #ifdef NO_DEBUG_ALLOCATION
 996   free((char*) buf);
 997 #else
 998   wxDebugFree(buf);
 999 #endif
1000 }
1001 #endif
1002
1003 // VC++ 6.0
1004 #if defined(__VISUALC__) && (__VISUALC__ >= 1200)
1005 void operator delete(void* pData, wxChar* /* fileName */, int /* lineNum */)
1006 {
1007   wxDebugFree(pData, FALSE);
1008 }
1009 // New operator 21/11/1998
1010 void operator delete[](void* pData, char* /* fileName */, int /* lineNum */)
1011 {
1012   wxDebugFree(pData, TRUE);
1013 }
1014 #endif
1015
1016 #if wxUSE_ARRAY_MEMORY_OPERATORS
1017
1018 void operator delete[] (void * buf)
1019 {
1020 #ifdef NO_DEBUG_ALLOCATION
1021   free((char*) buf);
1022 #else
1023   wxDebugFree(buf, TRUE);
1024 #endif
1025 }
1026 #endif
1027
1028 #endif
1029
1030 // TODO: store whether this is a vector or not.
1031 void * wxDebugAlloc(size_t size, wxChar * fileName, int lineNum, bool isObject, bool WXUNUSED(isVect) )
1032 {
1033   // If not in debugging allocation mode, do the normal thing
1034   // so we don't leave any trace of ourselves in the node list.
1035
1036   if (!wxDebugContext::GetDebugMode())
1037   {
1038     return (void *)malloc(size);
1039   }
1040
1041     int totSize = wxDebugContext::TotSize (size);
1042     char * buf = (char *) malloc(totSize);
1043     if (!buf) {
1044         wxLogDebug(wxT("Call to malloc (%ld) failed."), (long)size);
1045         return 0;
1046     }
1047     wxMemStruct * st = (wxMemStruct *)buf;
1048     st->m_firstMarker = MemStartCheck;
1049     st->m_reqSize = size;
1050     st->m_fileName = fileName;
1051     st->m_lineNum = lineNum;
1052     st->m_id = MemStructId;
1053     st->m_prev = 0;
1054     st->m_next = 0;
1055     st->m_isObject = isObject;
1056
1057     // Errors from Append() shouldn't really happen - but just in case!
1058     if (st->Append () == 0) {
1059         st->ErrorMsg ("Trying to append new node");
1060     }
1061
1062     if (wxDebugContext::GetCheckPrevious ()) {
1063         if (st->CheckAllPrevious () < 0) {
1064             st->ErrorMsg ("Checking previous nodes");
1065         }
1066     }
1067
1068     // Set up the extra markers at the middle and end.
1069     char * ptr = wxDebugContext::MidMarkerPos (buf);
1070     * (wxMarkerType *) ptr = MemMidCheck;
1071     ptr = wxDebugContext::EndMarkerPos (buf, size);
1072     * (wxMarkerType *) ptr = MemEndCheck;
1073
1074     // pointer returned points to the start of the caller's
1075     // usable area.
1076     void *m_actualData = (void *) wxDebugContext::CallerMemPos (buf);
1077     st->m_actualData = m_actualData;
1078
1079     return m_actualData;
1080 }
1081
1082 // TODO: check whether was allocated as a vector
1083 void wxDebugFree(void * buf, bool WXUNUSED(isVect) )
1084 {
1085   if (!buf)
1086     return;
1087
1088   // If not in debugging allocation mode, do the normal thing
1089   // so we don't leave any trace of ourselves in the node list.
1090   if (!wxDebugContext::GetDebugMode())
1091   {
1092     free((char *)buf);
1093     return;
1094   }
1095
1096     // Points to the start of the entire allocated area.
1097     char * startPointer = wxDebugContext::StartPos ((char *) buf);
1098     // Find the struct and make sure that it's identifiable.
1099     wxMemStruct * st = (wxMemStruct *) wxDebugContext::StructPos (startPointer);
1100
1101     if (! st->ValidateNode ())
1102         return;
1103
1104     // If this is the current checkpoint, we need to
1105     // move the checkpoint back so it points to a valid
1106     // node.
1107     if (st == wxDebugContext::checkPoint)
1108       wxDebugContext::checkPoint = wxDebugContext::checkPoint->m_prev;
1109
1110     if (! st->Unlink ())
1111     {
1112       st->ErrorMsg ("Unlinking deleted node");
1113     }
1114
1115     // Now put in the fill char into the id slot and the caller requested
1116     // memory locations.
1117     st->SetDeleted ();
1118     (void) memset (wxDebugContext::CallerMemPos (startPointer), MemFillChar,
1119                    st->RequestSize ());
1120
1121     // Don't allow delayed freeing of memory in this version
1122 //    if (!wxDebugContext::GetDelayFree())
1123 //    free((void *)st);
1124     free((char *)st);
1125 }
1126
1127 // Trace: send output to the current debugging stream
1128 void wxTrace(const wxChar *fmt ...)
1129 {
1130   va_list ap;
1131   static wxChar buffer[512];
1132
1133   va_start(ap, fmt);
1134
1135 #ifdef __WXMSW__
1136   wvsprintf(buffer,fmt,ap) ;
1137 #else
1138   vsprintf(buffer,fmt,ap) ;
1139 #endif
1140
1141   va_end(ap);
1142
1143   if (wxDebugContext::HasStream())
1144   {
1145     wxDebugContext::GetStream() << buffer;
1146     wxDebugContext::GetStream().flush();
1147   }
1148   else
1149 #ifdef __WXMSW__
1150 #ifdef __WIN32__
1151     OutputDebugString((LPCTSTR)buffer) ;
1152 #else
1153     OutputDebugString((const char*) buffer) ;
1154 #endif
1155 #else
1156     fprintf(stderr, buffer);
1157 #endif
1158 }
1159
1160 // Trace with level
1161 void wxTraceLevel(int level, const wxChar *fmt ...)
1162 {
1163   if (wxDebugContext::GetLevel() < level)
1164     return;
1165
1166   va_list ap;
1167   static wxChar buffer[512];
1168
1169   va_start(ap, fmt);
1170
1171 #ifdef __WXMSW__
1172   wvsprintf(buffer,fmt,ap) ;
1173 #else
1174   vsprintf(buffer,fmt,ap) ;
1175 #endif
1176
1177   va_end(ap);
1178
1179   if (wxDebugContext::HasStream())
1180   {
1181     wxDebugContext::GetStream() << buffer;
1182     wxDebugContext::GetStream().flush();
1183   }
1184   else
1185 #ifdef __WXMSW__
1186 #ifdef __WIN32__
1187     OutputDebugString((LPCTSTR)buffer) ;
1188 #else
1189     OutputDebugString((const char*) buffer) ;
1190 #endif
1191 #else
1192     fprintf(stderr, buffer);
1193 #endif
1194 }
1195
1196 #else // wxUSE_MEMORY_TRACING && defined(__WXDEBUG__)
1197 void wxTrace(const char *WXUNUSED(fmt) ...)
1198 {
1199 }
1200
1201 void wxTraceLevel(int WXUNUSED(level), const char *WXUNUSED(fmt) ...)
1202 {
1203 }
1204 #endif
1205