src/common/memory.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/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
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // For compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #ifdef __BORLANDC__
  16     #pragma hdrstop
  17 #endif
  18
  19 #if (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
  20
  21 #include "wx/memory.h"
  22
  23 #ifndef WX_PRECOMP
  24     #ifdef __WXMSW__
  25         #include "wx/msw/wrapwin.h"
  26     #endif
  27     #include "wx/utils.h"
  28     #include "wx/app.h"
  29     #include "wx/hash.h"
  30     #include "wx/log.h"
  31 #endif
  32
  33 #if wxUSE_THREADS
  34     #include "wx/thread.h"
  35 #endif
  36
  37 #include <stdlib.h>
  38
  39 #include "wx/ioswrap.h"
  40
  41 #if !defined(__WATCOMC__) && !(defined(__VMS__) && ( __VMS_VER < 70000000 ) )\
  42      && !defined( __MWERKS__ )
  43 #include <memory.h>
  44 #endif
  45
  46 #include <stdarg.h>
  47 #include <string.h>
  48
  49 #if wxUSE_THREADS && defined(__WXDEBUG__)
  50 #define USE_THREADSAFE_MEMORY_ALLOCATION 1
  51 #else
  52 #define USE_THREADSAFE_MEMORY_ALLOCATION 0
  53 #endif
  54
  55
  56 #ifdef new
  57 #undef new
  58 #endif
  59
  60 // wxDebugContext wxTheDebugContext;
  61 /*
  62   Redefine new and delete so that we can pick up situations where:
  63         - we overwrite or underwrite areas of malloc'd memory.
  64         - we use uninitialise variables
  65   Only do this in debug mode.
  66
  67   We change new to get enough memory to allocate a struct, followed
  68   by the caller's requested memory, followed by a tag. The struct
  69   is used to create a doubly linked list of these areas and also
  70   contains another tag. The tags are used to determine when the area
  71   has been over/under written.
  72 */
  73
  74
  75 /*
  76   Values which are used to set the markers which will be tested for
  77   under/over write. There are 3 of these, one in the struct, one
  78   immediately after the struct but before the caller requested memory and
  79   one immediately after the requested memory.
  80 */
  81 #define MemStartCheck  0x23A8
  82 #define MemMidCheck  0xA328
  83 #define MemEndCheck 0x8A32
  84 #define MemFillChar 0xAF
  85 #define MemStructId  0x666D
  86
  87 /*
  88   External interface for the wxMemStruct class. Others are
  89   defined inline within the class def. Here we only need to be able
  90   to add and delete nodes from the list and handle errors in some way.
  91 */
  92
  93 /*
  94   Used for internal "this shouldn't happen" type of errors.
  95 */
  96 void wxMemStruct::ErrorMsg (const char * mesg)
  97 {
  98   wxLogMessage(wxT("wxWidgets memory checking error: %s"), mesg);
  99   PrintNode ();
 100 }
 101
 102 /*
 103   Used when we find an overwrite or an underwrite error.
 104 */
 105 void wxMemStruct::ErrorMsg ()
 106 {
 107   wxLogMessage(wxT("wxWidgets over/underwrite memory error:"));
 108   PrintNode ();
 109 }
 110
 111
 112 /*
 113   We want to find out if pointers have been overwritten as soon as is
 114   possible, so test everything before we dereference it. Of course it's still
 115   quite possible that, if things have been overwritten, this function will
 116   fall over, but the only way of dealing with that would cost too much in terms
 117   of time.
 118 */
 119 int wxMemStruct::AssertList ()
 120 {
 121     if (wxDebugContext::GetHead () != 0 && ! (wxDebugContext::GetHead ())->AssertIt () ||
 122         wxDebugContext::GetTail () != 0 && ! wxDebugContext::GetTail ()->AssertIt ()) {
 123         ErrorMsg ("Head or tail pointers trashed");
 124         return 0;
 125     }
 126     return 1;
 127 }
 128
 129
 130 /*
 131   Check that the thing we're pointing to has the correct id for a wxMemStruct
 132   object and also that it's previous and next pointers are pointing at objects
 133   which have valid ids.
 134   This is definitely not perfect since we could fall over just trying to access
 135   any of the slots which we use here, but I think it's about the best that I
 136   can do without doing something like taking all new wxMemStruct pointers and
 137   comparing them against all known pointer within the list and then only
 138   doing this sort of check _after_ you've found the pointer in the list. That
 139   would be safer, but also much more time consuming.
 140 */
 141 int wxMemStruct::AssertIt ()
 142 {
 143     return (m_id == MemStructId &&
 144             (m_prev == 0 || m_prev->m_id == MemStructId) &&
 145             (m_next == 0 || m_next->m_id == MemStructId));
 146 }
 147
 148
 149 /*
 150   Additions are always at the tail of the list.
 151   Returns 0 on error, non-zero on success.
 152 */
 153 int wxMemStruct::Append ()
 154 {
 155     if (! AssertList ())
 156         return 0;
 157
 158     if (wxDebugContext::GetHead () == 0) {
 159         if (wxDebugContext::GetTail () != 0) {
 160             ErrorMsg ("Null list should have a null tail pointer");
 161             return 0;
 162         }
 163         (void) wxDebugContext::SetHead (this);
 164         (void) wxDebugContext::SetTail (this);
 165     } else {
 166         wxDebugContext::GetTail ()->m_next = this;
 167         this->m_prev = wxDebugContext::GetTail ();
 168         (void) wxDebugContext::SetTail (this);
 169     }
 170     return 1;
 171 }
 172
 173
 174 /*
 175   Don't actually free up anything here as the space which is used
 176   by the node will be free'd up when the whole block is free'd.
 177   Returns 0 on error, non-zero on success.
 178 */
 179 int wxMemStruct::Unlink ()
 180 {
 181     if (! AssertList ())
 182         return 0;
 183
 184     if (wxDebugContext::GetHead () == 0 || wxDebugContext::GetTail () == 0) {
 185         ErrorMsg ("Trying to remove node from empty list");
 186         return 0;
 187     }
 188
 189     // Handle the part of the list before this node.
 190     if (m_prev == 0) {
 191         if (this != wxDebugContext::GetHead ()) {
 192             ErrorMsg ("No previous node for non-head node");
 193             return 0;
 194         }
 195         (void) wxDebugContext::SetHead (m_next);
 196     } else {
 197         if (! m_prev->AssertIt ()) {
 198             ErrorMsg ("Trashed previous pointer");
 199             return 0;
 200         }
 201
 202         if (m_prev->m_next != this) {
 203             ErrorMsg ("List is inconsistent");
 204             return 0;
 205         }
 206         m_prev->m_next = m_next;
 207     }
 208
 209     // Handle the part of the list after this node.
 210     if (m_next == 0) {
 211         if (this != wxDebugContext::GetTail ()) {
 212             ErrorMsg ("No next node for non-tail node");
 213             return 0;
 214         }
 215         (void) wxDebugContext::SetTail (m_prev);
 216     } else {
 217         if (! m_next->AssertIt ()) {
 218             ErrorMsg ("Trashed next pointer");
 219             return 0;
 220         }
 221
 222         if (m_next->m_prev != this) {
 223             ErrorMsg ("List is inconsistent");
 224             return 0;
 225         }
 226         m_next->m_prev = m_prev;
 227     }
 228
 229     return 1;
 230 }
 231
 232
 233
 234 /*
 235   Checks a node and block of memory to see that the markers are still
 236   intact.
 237 */
 238 int wxMemStruct::CheckBlock ()
 239 {
 240     int nFailures = 0;
 241
 242     if (m_firstMarker != MemStartCheck) {
 243         nFailures++;
 244         ErrorMsg ();
 245     }
 246
 247     char * pointer = wxDebugContext::MidMarkerPos ((char *) this);
 248     if (* (wxMarkerType *) pointer != MemMidCheck) {
 249         nFailures++;
 250         ErrorMsg ();
 251     }
 252
 253     pointer = wxDebugContext::EndMarkerPos ((char *) this, RequestSize ());
 254     if (* (wxMarkerType *) pointer != MemEndCheck) {
 255         nFailures++;
 256         ErrorMsg ();
 257     }
 258
 259     return nFailures;
 260 }
 261
 262
 263 /*
 264   Check the list of nodes to see if they are all ok.
 265 */
 266 int wxMemStruct::CheckAllPrevious ()
 267 {
 268     int nFailures = 0;
 269
 270     for (wxMemStruct * st = this->m_prev; st != 0; st = st->m_prev) {
 271         if (st->AssertIt ())
 272             nFailures += st->CheckBlock ();
 273         else
 274             return -1;
 275     }
 276
 277     return nFailures;
 278 }
 279
 280
 281 /*
 282   When we delete a node we set the id slot to a specific value and then test
 283   against this to see if a nodes have been deleted previously. I don't
 284   just set the entire memory to the fillChar because then I'd be overwriting
 285   useful stuff like the vtbl which may be needed to output the error message
 286   including the file name and line numbers. Without this info the whole point
 287   of this class is lost!
 288 */
 289 void wxMemStruct::SetDeleted ()
 290 {
 291     m_id = MemFillChar;
 292 }
 293
 294 int wxMemStruct::IsDeleted ()
 295 {
 296     return (m_id == MemFillChar);
 297 }
 298
 299
 300 /*
 301   Print out a single node. There are many far better ways of doing this
 302   but this will suffice for now.
 303 */
 304 void wxMemStruct::PrintNode ()
 305 {
 306   if (m_isObject)
 307   {
 308     wxObject *obj = (wxObject *)m_actualData;
 309     wxClassInfo *info = obj->GetClassInfo();
 310
 311     // Let's put this in standard form so IDEs can load the file at the appropriate
 312     // line
 313     wxString msg;
 314
 315     if (m_fileName)
 316       msg.Printf(wxT("%s(%d): "), m_fileName, (int)m_lineNum);
 317
 318     if (info && info->GetClassName())
 319       msg += info->GetClassName();
 320     else
 321       msg += wxT("object");
 322
 323     wxString msg2;
 324     msg2.Printf(wxT(" at 0x%lX, size %d"), (long)GetActualData(), (int)RequestSize());
 325     msg += msg2;
 326
 327     wxLogMessage(msg);
 328   }
 329   else
 330   {
 331     wxString msg;
 332
 333     if (m_fileName)
 334       msg.Printf(wxT("%s(%d): "), m_fileName, (int)m_lineNum);
 335     msg += wxT("non-object data");
 336     wxString msg2;
 337     msg2.Printf(wxT(" at 0x%lX, size %d\n"), (long)GetActualData(), (int)RequestSize());
 338     msg += msg2;
 339
 340     wxLogMessage(msg);
 341   }
 342 }
 343
 344 void wxMemStruct::Dump ()
 345 {
 346   if (!ValidateNode()) return;
 347
 348   if (m_isObject)
 349   {
 350     wxObject *obj = (wxObject *)m_actualData;
 351
 352     wxString msg;
 353     if (m_fileName)
 354       msg.Printf(wxT("%s(%d): "), m_fileName, (int)m_lineNum);
 355
 356
 357     /* TODO: We no longer have a stream (using wxLogDebug) so we can't dump it.
 358      * Instead, do what wxObject::Dump does.
 359      * What should we do long-term, eliminate Dumping? Or specify
 360      * that MyClass::Dump should use wxLogDebug? Ugh.
 361     obj->Dump(wxDebugContext::GetStream());
 362      */
 363
 364     if (obj->GetClassInfo() && obj->GetClassInfo()->GetClassName())
 365       msg += obj->GetClassInfo()->GetClassName();
 366     else
 367       msg += wxT("unknown object class");
 368
 369     wxString msg2;
 370     msg2.Printf(wxT(" at 0x%lX, size %d"), (long)GetActualData(), (int)RequestSize());
 371     msg += msg2;
 372
 373     wxDebugContext::OutputDumpLine(msg.c_str());
 374   }
 375   else
 376   {
 377     wxString msg;
 378     if (m_fileName)
 379       msg.Printf(wxT("%s(%d): "), m_fileName, (int)m_lineNum);
 380
 381     wxString msg2;
 382     msg2.Printf(wxT("non-object data at 0x%lX, size %d"), (long)GetActualData(), (int)RequestSize() );
 383     msg += msg2;
 384     wxDebugContext::OutputDumpLine(msg.c_str());
 385   }
 386 }
 387
 388
 389 /*
 390   Validate a node. Check to see that the node is "clean" in the sense
 391   that nothing has over/underwritten it etc.
 392 */
 393 int wxMemStruct::ValidateNode ()
 394 {
 395     char * startPointer = (char *) this;
 396     if (!AssertIt ()) {
 397         if (IsDeleted ())
 398             ErrorMsg ("Object already deleted");
 399         else {
 400             // Can't use the error routines as we have no recognisable object.
 401 #ifndef __WXGTK__
 402              wxLogMessage(wxT("Can't verify memory struct - all bets are off!"));
 403 #endif
 404         }
 405         return 0;
 406     }
 407
 408 /*
 409     int i;
 410     for (i = 0; i < wxDebugContext::TotSize (requestSize ()); i++)
 411       cout << startPointer [i];
 412     cout << endl;
 413 */
 414     if (Marker () != MemStartCheck)
 415       ErrorMsg ();
 416     if (* (wxMarkerType *) wxDebugContext::MidMarkerPos (startPointer) != MemMidCheck)
 417       ErrorMsg ();
 418     if (* (wxMarkerType *) wxDebugContext::EndMarkerPos (startPointer,
 419                                               RequestSize ()) !=
 420         MemEndCheck)
 421       ErrorMsg ();
 422
 423     // Back to before the extra buffer and check that
 424     // we can still read what we originally wrote.
 425     if (Marker () != MemStartCheck ||
 426         * (wxMarkerType *) wxDebugContext::MidMarkerPos (startPointer)
 427                          != MemMidCheck ||
 428         * (wxMarkerType *) wxDebugContext::EndMarkerPos (startPointer,
 429                                               RequestSize ()) != MemEndCheck)
 430     {
 431         ErrorMsg ();
 432         return 0;
 433     }
 434
 435     return 1;
 436 }
 437
 438 /*
 439   The wxDebugContext class.
 440 */
 441
 442 wxMemStruct *wxDebugContext::m_head = NULL;
 443 wxMemStruct *wxDebugContext::m_tail = NULL;
 444
 445 bool wxDebugContext::m_checkPrevious = false;
 446 int wxDebugContext::debugLevel = 1;
 447 bool wxDebugContext::debugOn = true;
 448 wxMemStruct *wxDebugContext::checkPoint = NULL;
 449
 450 // For faster alignment calculation
 451 static wxMarkerType markerCalc[2];
 452 int wxDebugContext::m_balign = (int)((char *)&markerCalc[1] - (char*)&markerCalc[0]);
 453 int wxDebugContext::m_balignmask = (int)((char *)&markerCalc[1] - (char*)&markerCalc[0]) - 1;
 454
 455 // Pointer to global function to call at shutdown
 456 wxShutdownNotifyFunction wxDebugContext::sm_shutdownFn;
 457
 458 wxDebugContext::wxDebugContext(void)
 459 {
 460 }
 461
 462 wxDebugContext::~wxDebugContext(void)
 463 {
 464 }
 465
 466 /*
 467   Work out the positions of the markers by creating an array of 2 markers
 468   and comparing the addresses of the 2 elements. Use this number as the
 469   alignment for markers.
 470 */
 471 size_t wxDebugContext::CalcAlignment ()
 472 {
 473     wxMarkerType ar[2];
 474     return (char *) &ar[1] - (char *) &ar[0];
 475 }
 476
 477
 478 char * wxDebugContext::StructPos (const char * buf)
 479 {
 480     return (char *) buf;
 481 }
 482
 483 char * wxDebugContext::MidMarkerPos (const char * buf)
 484 {
 485     return StructPos (buf) + PaddedSize (sizeof (wxMemStruct));
 486 }
 487
 488 char * wxDebugContext::CallerMemPos (const char * buf)
 489 {
 490     return MidMarkerPos (buf) + PaddedSize (sizeof(wxMarkerType));
 491 }
 492
 493
 494 char * wxDebugContext::EndMarkerPos (const char * buf, const size_t size)
 495 {
 496     return CallerMemPos (buf) + PaddedSize (size);
 497 }
 498
 499
 500 /*
 501   Slightly different as this takes a pointer to the start of the caller
 502   requested region and returns a pointer to the start of the buffer.
 503   */
 504 char * wxDebugContext::StartPos (const char * caller)
 505 {
 506     return ((char *) (caller - wxDebugContext::PaddedSize (sizeof(wxMarkerType)) -
 507             wxDebugContext::PaddedSize (sizeof (wxMemStruct))));
 508 }
 509
 510 /*
 511   We may need padding between various parts of the allocated memory.
 512   Given a size of memory, this returns the amount of memory which should
 513   be allocated in order to allow for alignment of the following object.
 514
 515   I don't know how portable this stuff is, but it seems to work for me at
 516   the moment. It would be real nice if I knew more about this!
 517
 518   // Note: this function is now obsolete (along with CalcAlignment)
 519   // because the calculations are done statically, for greater speed.
 520 */
 521 size_t wxDebugContext::GetPadding (const size_t size)
 522 {
 523     size_t pad = size % CalcAlignment ();
 524     return (pad) ? sizeof(wxMarkerType) - pad : 0;
 525 }
 526
 527 size_t wxDebugContext::PaddedSize (const size_t size)
 528 {
 529     // Added by Terry Farnham <TJRT@pacbell.net> to replace
 530     // slow GetPadding call.
 531     int padb;
 532
 533     padb = size & m_balignmask;
 534     if(padb)
 535         return(size + m_balign - padb);
 536     else
 537         return(size);
 538 }
 539
 540 /*
 541   Returns the total amount of memory which we need to get from the system
 542   in order to satisfy a caller request. This includes space for the struct
 543   plus markers and the caller's memory as well.
 544 */
 545 size_t wxDebugContext::TotSize (const size_t reqSize)
 546 {
 547     return (PaddedSize (sizeof (wxMemStruct)) + PaddedSize (reqSize) +
 548             2 * sizeof(wxMarkerType));
 549 }
 550
 551
 552 /*
 553   Traverse the list of nodes executing the given function on each node.
 554 */
 555 void wxDebugContext::TraverseList (PmSFV func, wxMemStruct *from)
 556 {
 557   if (!from)
 558     from = wxDebugContext::GetHead ();
 559
 560   wxMemStruct * st = NULL;
 561   for (st = from; st != 0; st = st->m_next)
 562   {
 563       void* data = st->GetActualData();
 564 //      if ((data != (void*)m_debugStream) && (data != (void*) m_streamBuf))
 565       if (data != (void*) wxLog::GetActiveTarget())
 566       {
 567         (st->*func) ();
 568       }
 569   }
 570 }
 571
 572
 573 /*
 574   Print out the list.
 575   */
 576 bool wxDebugContext::PrintList (void)
 577 {
 578 #ifdef __WXDEBUG__
 579   TraverseList ((PmSFV)&wxMemStruct::PrintNode, (checkPoint ? checkPoint->m_next : (wxMemStruct*)NULL));
 580
 581   return true;
 582 #else
 583   return false;
 584 #endif
 585 }
 586
 587 bool wxDebugContext::Dump(void)
 588 {
 589 #ifdef __WXDEBUG__
 590   {
 591     const wxChar* appName = wxT("application");
 592     wxString appNameStr;
 593     if (wxTheApp)
 594     {
 595         appNameStr = wxTheApp->GetAppName();
 596         appName = appNameStr.c_str();
 597         OutputDumpLine(wxT("----- Memory dump of %s at %s -----"), appName, wx_static_cast(const wxChar *, wxNow().c_str()));
 598     }
 599     else
 600     {
 601       OutputDumpLine( wxT("----- Memory dump -----") );
 602     }
 603   }
 604
 605   TraverseList ((PmSFV)&wxMemStruct::Dump, (checkPoint ? checkPoint->m_next : (wxMemStruct*)NULL));
 606
 607   OutputDumpLine(wxEmptyString);
 608   OutputDumpLine(wxEmptyString);
 609
 610   return true;
 611 #else
 612   return false;
 613 #endif
 614 }
 615
 616 #ifdef __WXDEBUG__
 617 struct wxDebugStatsStruct
 618 {
 619   long instanceCount;
 620   long totalSize;
 621   wxChar *instanceClass;
 622   wxDebugStatsStruct *next;
 623 };
 624
 625 static wxDebugStatsStruct *FindStatsStruct(wxDebugStatsStruct *st, wxChar *name)
 626 {
 627   while (st)
 628   {
 629     if (wxStrcmp(st->instanceClass, name) == 0)
 630       return st;
 631     st = st->next;
 632   }
 633   return NULL;
 634 }
 635
 636 static wxDebugStatsStruct *InsertStatsStruct(wxDebugStatsStruct *head, wxDebugStatsStruct *st)
 637 {
 638   st->next = head;
 639   return st;
 640 }
 641 #endif
 642
 643 bool wxDebugContext::PrintStatistics(bool detailed)
 644 {
 645 #ifdef __WXDEBUG__
 646   {
 647     const wxChar* appName = wxT("application");
 648     wxString appNameStr;
 649     if (wxTheApp)
 650     {
 651         appNameStr = wxTheApp->GetAppName();
 652         appName = appNameStr.c_str();
 653         OutputDumpLine(wxT("----- Memory statistics of %s at %s -----"), appName, wx_static_cast(const wxChar *, wxNow().c_str()));
 654     }
 655     else
 656     {
 657       OutputDumpLine( wxT("----- Memory statistics -----") );
 658     }
 659   }
 660
 661   bool currentMode = GetDebugMode();
 662   SetDebugMode(false);
 663
 664   long noNonObjectNodes = 0;
 665   long noObjectNodes = 0;
 666   long totalSize = 0;
 667
 668   wxDebugStatsStruct *list = NULL;
 669
 670   wxMemStruct *from = (checkPoint ? checkPoint->m_next : (wxMemStruct*)NULL );
 671   if (!from)
 672     from = wxDebugContext::GetHead ();
 673
 674   wxMemStruct *st;
 675   for (st = from; st != 0; st = st->m_next)
 676   {
 677     void* data = st->GetActualData();
 678     if (detailed && (data != (void*) wxLog::GetActiveTarget()))
 679     {
 680       wxChar *className = (wxChar*) wxT("nonobject");
 681       if (st->m_isObject && st->GetActualData())
 682       {
 683         wxObject *obj = (wxObject *)st->GetActualData();
 684         if (obj->GetClassInfo()->GetClassName())
 685           className = (wxChar*)obj->GetClassInfo()->GetClassName();
 686       }
 687       wxDebugStatsStruct *stats = FindStatsStruct(list, className);
 688       if (!stats)
 689       {
 690         stats = (wxDebugStatsStruct *)malloc(sizeof(wxDebugStatsStruct));
 691         stats->instanceClass = className;
 692         stats->instanceCount = 0;
 693         stats->totalSize = 0;
 694         list = InsertStatsStruct(list, stats);
 695       }
 696       stats->instanceCount ++;
 697       stats->totalSize += st->RequestSize();
 698     }
 699
 700     if (data != (void*) wxLog::GetActiveTarget())
 701     {
 702         totalSize += st->RequestSize();
 703         if (st->m_isObject)
 704             noObjectNodes ++;
 705         else
 706             noNonObjectNodes ++;
 707     }
 708   }
 709
 710   if (detailed)
 711   {
 712     while (list)
 713     {
 714       OutputDumpLine(wxT("%ld objects of class %s, total size %ld"),
 715           list->instanceCount, list->instanceClass, list->totalSize);
 716       wxDebugStatsStruct *old = list;
 717       list = old->next;
 718       free((char *)old);
 719     }
 720     OutputDumpLine(wxEmptyString);
 721   }
 722
 723   SetDebugMode(currentMode);
 724
 725   OutputDumpLine(wxT("Number of object items: %ld"), noObjectNodes);
 726   OutputDumpLine(wxT("Number of non-object items: %ld"), noNonObjectNodes);
 727   OutputDumpLine(wxT("Total allocated size: %ld"), totalSize);
 728   OutputDumpLine(wxEmptyString);
 729   OutputDumpLine(wxEmptyString);
 730
 731   return true;
 732 #else
 733   (void)detailed;
 734   return false;
 735 #endif
 736 }
 737
 738 bool wxDebugContext::PrintClasses(void)
 739 {
 740   {
 741     const wxChar* appName = wxT("application");
 742     wxString appNameStr;
 743     if (wxTheApp)
 744     {
 745         appNameStr = wxTheApp->GetAppName();
 746         appName = appNameStr.c_str();
 747         wxLogMessage(wxT("----- Classes in %s -----"), appName);
 748     }
 749   }
 750
 751   int n = 0;
 752   const wxClassInfo *info;
 753
 754   for (wxClassInfo::const_iterator node = wxClassInfo::begin_classinfo(),
 755                                     end = wxClassInfo::end_classinfo();
 756        node != end; ++node)
 757   {
 758     info = *node;
 759     if (info->GetClassName())
 760     {
 761         wxString msg(info->GetClassName());
 762         msg += wxT(" ");
 763
 764         if (info->GetBaseClassName1() && !info->GetBaseClassName2())
 765         {
 766             msg += wxT("is a ");
 767             msg += info->GetBaseClassName1();
 768         }
 769         else if (info->GetBaseClassName1() && info->GetBaseClassName2())
 770         {
 771             msg += wxT("is a ");
 772             msg += info->GetBaseClassName1() ;
 773             msg += wxT(", ");
 774             msg += info->GetBaseClassName2() ;
 775         }
 776         if (info->GetConstructor())
 777             msg += wxT(": dynamic");
 778
 779         wxLogMessage(msg);
 780     }
 781     n ++;
 782   }
 783   wxLogMessage(wxEmptyString);
 784   wxLogMessage(wxT("There are %d classes derived from wxObject."), n);
 785   wxLogMessage(wxEmptyString);
 786   wxLogMessage(wxEmptyString);
 787   return true;
 788 }
 789
 790 void wxDebugContext::SetCheckpoint(bool all)
 791 {
 792   if (all)
 793     checkPoint = NULL;
 794   else
 795     checkPoint = m_tail;
 796 }
 797
 798 // Checks all nodes since checkpoint, or since start.
 799 int wxDebugContext::Check(bool checkAll)
 800 {
 801   int nFailures = 0;
 802
 803   wxMemStruct *from = (checkPoint ? checkPoint->m_next : (wxMemStruct*)NULL );
 804   if (!from || checkAll)
 805     from = wxDebugContext::GetHead ();
 806
 807   for (wxMemStruct * st = from; st != 0; st = st->m_next)
 808   {
 809     if (st->AssertIt ())
 810       nFailures += st->CheckBlock ();
 811     else
 812       return -1;
 813   }
 814
 815   return nFailures;
 816 }
 817
 818 // Count the number of non-wxDebugContext-related objects
 819 // that are outstanding
 820 int wxDebugContext::CountObjectsLeft(bool sinceCheckpoint)
 821 {
 822   int n = 0;
 823
 824   wxMemStruct *from = NULL;
 825   if (sinceCheckpoint && checkPoint)
 826     from = checkPoint->m_next;
 827   else
 828     from = wxDebugContext::GetHead () ;
 829
 830   for (wxMemStruct * st = from; st != 0; st = st->m_next)
 831   {
 832       void* data = st->GetActualData();
 833       if (data != (void*) wxLog::GetActiveTarget())
 834           n ++;
 835   }
 836
 837   return n ;
 838 }
 839
 840 // This function is used to output the dump
 841 void wxDebugContext::OutputDumpLine(const wxChar *szFormat, ...)
 842 {
 843     // a buffer of 2048 bytes should be long enough for a file name
 844     // and a class name
 845     wxChar buf[2048];
 846     int count;
 847     va_list argptr;
 848     va_start(argptr, szFormat);
 849     buf[sizeof(buf)/sizeof(wxChar)-1] = _T('\0');
 850
 851     // keep 3 bytes for a \r\n\0
 852     count = wxVsnprintf(buf, sizeof(buf)/sizeof(wxChar)-3, szFormat, argptr);
 853
 854     if ( count < 0 )
 855         count = sizeof(buf)/sizeof(wxChar)-3;
 856     buf[count]=_T('\r');
 857     buf[count+1]=_T('\n');
 858     buf[count+2]=_T('\0');
 859
 860     wxMessageOutputDebug dbgout;
 861     dbgout.Printf(buf);
 862 }
 863
 864 void wxDebugContext::SetShutdownNotifyFunction(wxShutdownNotifyFunction shutdownFn)
 865 {
 866     sm_shutdownFn = shutdownFn;
 867 }
 868
 869
 870 #if USE_THREADSAFE_MEMORY_ALLOCATION
 871 static bool memSectionOk = false;
 872
 873 class MemoryCriticalSection : public wxCriticalSection
 874 {
 875 public:
 876     MemoryCriticalSection() {
 877         memSectionOk = true;
 878     }
 879     ~MemoryCriticalSection() {
 880         memSectionOk = false;
 881     }
 882 };
 883
 884 class MemoryCriticalSectionLocker
 885 {
 886 public:
 887     inline MemoryCriticalSectionLocker(wxCriticalSection& critsect)
 888     : m_critsect(critsect), m_locked(memSectionOk) { if(m_locked) m_critsect.Enter(); }
 889     inline ~MemoryCriticalSectionLocker() { if(m_locked) m_critsect.Leave(); }
 890
 891 private:
 892     // no assignment operator nor copy ctor
 893     MemoryCriticalSectionLocker(const MemoryCriticalSectionLocker&);
 894     MemoryCriticalSectionLocker& operator=(const MemoryCriticalSectionLocker&);
 895
 896     wxCriticalSection& m_critsect;
 897     bool m_locked;
 898 };
 899
 900 static MemoryCriticalSection memLocker;
 901
 902 #endif // USE_THREADSAFE_MEMORY_ALLOCATION
 903
 904
 905 #ifdef __WXDEBUG__
 906 #if !(defined(__WXMSW__) && (defined(WXUSINGDLL) || defined(WXMAKINGDLL_BASE)))
 907 #if wxUSE_GLOBAL_MEMORY_OPERATORS
 908 void * operator new (size_t size, wxChar * fileName, int lineNum)
 909 {
 910     return wxDebugAlloc(size, fileName, lineNum, false, false);
 911 }
 912
 913 void * operator new (size_t size)
 914 {
 915     return wxDebugAlloc(size, NULL, 0, false);
 916 }
 917
 918 void operator delete (void * buf)
 919 {
 920     wxDebugFree(buf, false);
 921 }
 922
 923 #if wxUSE_ARRAY_MEMORY_OPERATORS
 924 void * operator new[] (size_t size)
 925 {
 926     return wxDebugAlloc(size, NULL, 0, false, true);
 927 }
 928
 929 void * operator new[] (size_t size, wxChar * fileName, int lineNum)
 930 {
 931     return wxDebugAlloc(size, fileName, lineNum, false, true);
 932 }
 933
 934 void operator delete[] (void * buf)
 935 {
 936   wxDebugFree(buf, true);
 937 }
 938 #endif // wxUSE_ARRAY_MEMORY_OPERATORS
 939 #endif // wxUSE_GLOBAL_MEMORY_OPERATORS
 940 #endif // !(defined(__WXMSW__) && (defined(WXUSINGDLL) || defined(WXMAKINGDLL_BASE)))
 941
 942 // TODO: store whether this is a vector or not.
 943 void * wxDebugAlloc(size_t size, wxChar * fileName, int lineNum, bool isObject, bool WXUNUSED(isVect) )
 944 {
 945 #if USE_THREADSAFE_MEMORY_ALLOCATION
 946   MemoryCriticalSectionLocker lock(memLocker);
 947 #endif
 948
 949   // If not in debugging allocation mode, do the normal thing
 950   // so we don't leave any trace of ourselves in the node list.
 951
 952 #if defined(__VISAGECPP__) && (__IBMCPP__ < 400 || __IBMC__ < 400 )
 953 // VA 3.0 still has trouble in here
 954   return (void *)malloc(size);
 955 #endif
 956   if (!wxDebugContext::GetDebugMode())
 957   {
 958     return (void *)malloc(size);
 959   }
 960
 961     int totSize = wxDebugContext::TotSize (size);
 962     char * buf = (char *) malloc(totSize);
 963     if (!buf) {
 964         wxLogMessage(wxT("Call to malloc (%ld) failed."), (long)size);
 965         return 0;
 966     }
 967     wxMemStruct * st = (wxMemStruct *)buf;
 968     st->m_firstMarker = MemStartCheck;
 969     st->m_reqSize = size;
 970     st->m_fileName = fileName;
 971     st->m_lineNum = lineNum;
 972     st->m_id = MemStructId;
 973     st->m_prev = 0;
 974     st->m_next = 0;
 975     st->m_isObject = isObject;
 976
 977     // Errors from Append() shouldn't really happen - but just in case!
 978     if (st->Append () == 0) {
 979         st->ErrorMsg ("Trying to append new node");
 980     }
 981
 982     if (wxDebugContext::GetCheckPrevious ()) {
 983         if (st->CheckAllPrevious () < 0) {
 984             st->ErrorMsg ("Checking previous nodes");
 985         }
 986     }
 987
 988     // Set up the extra markers at the middle and end.
 989     char * ptr = wxDebugContext::MidMarkerPos (buf);
 990     * (wxMarkerType *) ptr = MemMidCheck;
 991     ptr = wxDebugContext::EndMarkerPos (buf, size);
 992     * (wxMarkerType *) ptr = MemEndCheck;
 993
 994     // pointer returned points to the start of the caller's
 995     // usable area.
 996     void *m_actualData = (void *) wxDebugContext::CallerMemPos (buf);
 997     st->m_actualData = m_actualData;
 998
 999     return m_actualData;
1000 }
1001
1002 // TODO: check whether was allocated as a vector
1003 void wxDebugFree(void * buf, bool WXUNUSED(isVect) )
1004 {
1005 #if USE_THREADSAFE_MEMORY_ALLOCATION
1006   MemoryCriticalSectionLocker lock(memLocker);
1007 #endif
1008
1009   if (!buf)
1010     return;
1011
1012 #if defined(__VISAGECPP__) && (__IBMCPP__ < 400 || __IBMC__ < 400 )
1013 // VA 3.0 still has trouble in here
1014   free((char *)buf);
1015 #endif
1016   // If not in debugging allocation mode, do the normal thing
1017   // so we don't leave any trace of ourselves in the node list.
1018   if (!wxDebugContext::GetDebugMode())
1019   {
1020     free((char *)buf);
1021     return;
1022   }
1023
1024     // Points to the start of the entire allocated area.
1025     char * startPointer = wxDebugContext::StartPos ((char *) buf);
1026     // Find the struct and make sure that it's identifiable.
1027     wxMemStruct * st = (wxMemStruct *) wxDebugContext::StructPos (startPointer);
1028
1029     if (! st->ValidateNode ())
1030         return;
1031
1032     // If this is the current checkpoint, we need to
1033     // move the checkpoint back so it points to a valid
1034     // node.
1035     if (st == wxDebugContext::checkPoint)
1036       wxDebugContext::checkPoint = wxDebugContext::checkPoint->m_prev;
1037
1038     if (! st->Unlink ())
1039     {
1040       st->ErrorMsg ("Unlinking deleted node");
1041     }
1042
1043     // Now put in the fill char into the id slot and the caller requested
1044     // memory locations.
1045     st->SetDeleted ();
1046     (void) memset (wxDebugContext::CallerMemPos (startPointer), MemFillChar,
1047                    st->RequestSize ());
1048
1049     free((char *)st);
1050 }
1051
1052 #endif // __WXDEBUG__
1053
1054 // Trace: send output to the current debugging stream
1055 void wxTrace(const wxChar * ...)
1056 {
1057 #if 1
1058     wxFAIL_MSG(wxT("wxTrace is now obsolete. Please use wxDebugXXX instead."));
1059 #else
1060     va_list ap;
1061   static wxChar buffer[512];
1062
1063   va_start(ap, fmt);
1064
1065 #ifdef __WXMSW__
1066   wvsprintf(buffer,fmt,ap) ;
1067 #else
1068   vsprintf(buffer,fmt,ap) ;
1069 #endif
1070
1071   va_end(ap);
1072
1073   if (wxDebugContext::HasStream())
1074   {
1075     wxDebugContext::GetStream() << buffer;
1076     wxDebugContext::GetStream().flush();
1077   }
1078   else
1079 #ifdef __WXMSW__
1080 #ifdef __WIN32__
1081     OutputDebugString((LPCTSTR)buffer) ;
1082 #else
1083     OutputDebugString((const char*) buffer) ;
1084 #endif
1085 #else
1086     fprintf(stderr, buffer);
1087 #endif
1088 #endif
1089 }
1090
1091 // Trace with level
1092 void wxTraceLevel(int, const wxChar * ...)
1093 {
1094 #if 1
1095     wxFAIL_MSG(wxT("wxTrace is now obsolete. Please use wxDebugXXX instead."));
1096 #else
1097   if (wxDebugContext::GetLevel() < level)
1098     return;
1099
1100   va_list ap;
1101   static wxChar buffer[512];
1102
1103   va_start(ap, fmt);
1104
1105 #ifdef __WXMSW__
1106   wxWvsprintf(buffer,fmt,ap) ;
1107 #else
1108   vsprintf(buffer,fmt,ap) ;
1109 #endif
1110
1111   va_end(ap);
1112
1113   if (wxDebugContext::HasStream())
1114   {
1115     wxDebugContext::GetStream() << buffer;
1116     wxDebugContext::GetStream().flush();
1117   }
1118   else
1119 #ifdef __WXMSW__
1120 #ifdef __WIN32__
1121     OutputDebugString((LPCTSTR)buffer) ;
1122 #else
1123     OutputDebugString((const char*) buffer) ;
1124 #endif
1125 #else
1126     fprintf(stderr, buffer);
1127 #endif
1128 #endif
1129 }
1130
1131 //----------------------------------------------------------------------------
1132 // Final cleanup after all global objects in all files have been destroyed
1133 //----------------------------------------------------------------------------
1134
1135 // Don't set it to 0 by dynamic initialization
1136 // Some compilers will really do the assignment later
1137 // All global variables are initialized to 0 at the very beginning, and this is just fine.
1138 int wxDebugContextDumpDelayCounter::sm_count;
1139
1140 wxDebugContextDumpDelayCounter::wxDebugContextDumpDelayCounter()
1141 {
1142     sm_count++;
1143 }
1144
1145 wxDebugContextDumpDelayCounter::~wxDebugContextDumpDelayCounter()
1146 {
1147     if ( !--sm_count )
1148     {
1149         // Notify app if we've been asked to do that
1150         if( wxDebugContext::sm_shutdownFn )
1151             wxDebugContext::sm_shutdownFn();
1152         DoDump();
1153     }
1154 }
1155
1156 void wxDebugContextDumpDelayCounter::DoDump()
1157 {
1158     if (wxDebugContext::CountObjectsLeft(true) > 0)
1159     {
1160         wxDebugContext::OutputDumpLine(wxT("There were memory leaks.\n"));
1161         wxDebugContext::Dump();
1162         wxDebugContext::PrintStatistics();
1163     }
1164 }
1165
1166 // Even if there is nothing else, make sure that there is at
1167 // least one cleanup counter object
1168 static wxDebugContextDumpDelayCounter wxDebugContextDumpDelayCounter_One;
1169
1170 #endif // (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT