Adding upstream version 6.0.4-dfsg.upstream/6.0.4-dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1444 insertions, 0 deletions

diff --git a/src/libs/xpcom18a4/xpcom/base/nsTraceRefcntImpl.cpp b/src/libs/xpcom18a4/xpcom/base/nsTraceRefcntImpl.cpp
new file mode 100644
index 00000000..f74e84df
--- /dev/null
+++ b/src/libs/xpcom18a4/xpcom/base/nsTraceRefcntImpl.cpp
@@ -0,0 +1,1444 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Communicator client code.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1998
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   L. David Baron <dbaron@dbaron.org>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either of the GNU General Public License Version 2 or later (the "GPL"),
+ * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#include "nsTraceRefcntImpl.h"
+#include "nscore.h"
+#include "nsISupports.h"
+#include "nsVoidArray.h"
+#include "prprf.h"
+#include "prlog.h"
+#include "plstr.h"
+#include <stdlib.h>
+#include "nsCOMPtr.h"
+#include "nsCRT.h"
+#include <math.h>
+
+#if defined(_WIN32)
+#include <windows.h>
+#elif defined(linux) && !defined(VBOX) && defined(__GLIBC__) && (defined(__i386) || defined(PPC))
+#include <setjmp.h>
+
+//
+// On glibc 2.1, the Dl_info api defined in <dlfcn.h> is only exposed
+// if __USE_GNU is defined.  I suppose its some kind of standards
+// adherence thing.
+//
+#if (__GLIBC_MINOR__ >= 1) && !defined(__USE_GNU)
+#define __USE_GNU
+#endif
+
+#include <dlfcn.h>
+#endif
+
+#ifdef HAVE_LIBDL
+#include <dlfcn.h>
+#endif
+
+#if defined(XP_MAC) && !TARGET_CARBON
+#include "macstdlibextras.h"
+#endif
+
+////////////////////////////////////////////////////////////////////////////////
+
+NS_COM void 
+NS_MeanAndStdDev(double n, double sumOfValues, double sumOfSquaredValues,
+                 double *meanResult, double *stdDevResult)
+{
+  double mean = 0.0, var = 0.0, stdDev = 0.0;
+  if (n > 0.0 && sumOfValues >= 0) {
+    mean = sumOfValues / n;
+    double temp = (n * sumOfSquaredValues) - (sumOfValues * sumOfValues);
+    if (temp < 0.0 || n <= 1)
+      var = 0.0;
+    else
+      var = temp / (n * (n - 1));
+    // for some reason, Windows says sqrt(0.0) is "-1.#J" (?!) so do this:
+    stdDev = var != 0.0 ? sqrt(var) : 0.0;
+  }
+  *meanResult = mean;
+  *stdDevResult = stdDev;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+#ifdef NS_BUILD_REFCNT_LOGGING
+#include "plhash.h"
+#include "prmem.h"
+
+#include "prlock.h"
+
+static PRLock* gTraceLock;
+
+#define LOCK_TRACELOG()   PR_Lock(gTraceLock)
+#define UNLOCK_TRACELOG() PR_Unlock(gTraceLock)
+
+static PLHashTable* gBloatView;
+static PLHashTable* gTypesToLog;
+static PLHashTable* gObjectsToLog;
+static PLHashTable* gSerialNumbers;
+static PRInt32 gNextSerialNumber;
+
+static PRBool gLogging;
+static PRBool gLogToLeaky;
+static PRBool gLogLeaksOnly;
+
+static void (*leakyLogAddRef)(void* p, int oldrc, int newrc);
+static void (*leakyLogRelease)(void* p, int oldrc, int newrc);
+
+static PRBool gInitialized = PR_FALSE;
+static FILE *gBloatLog = nsnull;
+static FILE *gRefcntsLog = nsnull;
+static FILE *gAllocLog = nsnull;
+static FILE *gLeakyLog = nsnull;
+static FILE *gCOMPtrLog = nsnull;
+static PRBool gActivityIsLegal = PR_FALSE;
+
+struct serialNumberRecord {
+  PRInt32 serialNumber;
+  PRInt32 refCount;
+  PRInt32 COMPtrCount;
+};
+
+struct nsTraceRefcntStats {
+  nsrefcnt mAddRefs;
+  nsrefcnt mReleases;
+  nsrefcnt mCreates;
+  nsrefcnt mDestroys;
+  double mRefsOutstandingTotal;
+  double mRefsOutstandingSquared;
+  double mObjsOutstandingTotal;
+  double mObjsOutstandingSquared;
+};
+
+#ifdef DEBUG_dbaron_off
+  // I hope to turn this on for everybody once we hit it a little less.
+#define ASSERT_ACTIVITY_IS_LEGAL                                                \
+  NS_WARN_IF_FALSE(gActivityIsLegal,                                         \
+                   "XPCOM objects created/destroyed from static ctor/dtor")
+#else
+#define ASSERT_ACTIVITY_IS_LEGAL
+#endif
+
+
+// These functions are copied from nsprpub/lib/ds/plhash.c, with changes
+// to the functions not called Default* to free the serialNumberRecord or
+// the BloatEntry.
+
+static void * PR_CALLBACK
+DefaultAllocTable(void *pool, PRSize size)
+{
+#if defined(XP_MAC)
+#pragma unused (pool)
+#endif
+
+    return PR_MALLOC(size);
+}
+
+static void PR_CALLBACK
+DefaultFreeTable(void *pool, void *item)
+{
+#if defined(XP_MAC)
+#pragma unused (pool)
+#endif
+
+    PR_Free(item);
+}
+
+static PLHashEntry * PR_CALLBACK
+DefaultAllocEntry(void *pool, const void *key)
+{
+#if defined(XP_MAC)
+#pragma unused (pool,key)
+#endif
+
+    return PR_NEW(PLHashEntry);
+}
+
+static void PR_CALLBACK
+SerialNumberFreeEntry(void *pool, PLHashEntry *he, PRUintn flag)
+{
+#if defined(XP_MAC)
+#pragma unused (pool)
+#endif
+
+    if (flag == HT_FREE_ENTRY) {
+        PR_Free(NS_REINTERPRET_CAST(serialNumberRecord*,he->value));
+        PR_Free(he);
+    }
+}
+
+static void PR_CALLBACK
+TypesToLogFreeEntry(void *pool, PLHashEntry *he, PRUintn flag)
+{
+#if defined(XP_MAC)
+#pragma unused (pool)
+#endif
+
+    if (flag == HT_FREE_ENTRY) {
+        nsCRT::free(NS_CONST_CAST(char*,
+                     NS_REINTERPRET_CAST(const char*, he->key)));
+        PR_Free(he);
+    }
+}
+
+static const PLHashAllocOps serialNumberHashAllocOps = {
+    DefaultAllocTable, DefaultFreeTable,
+    DefaultAllocEntry, SerialNumberFreeEntry
+};
+
+static const PLHashAllocOps typesToLogHashAllocOps = {
+    DefaultAllocTable, DefaultFreeTable,
+    DefaultAllocEntry, TypesToLogFreeEntry
+};
+
+////////////////////////////////////////////////////////////////////////////////
+
+class BloatEntry {
+public:
+  BloatEntry(const char* className, PRUint32 classSize)
+    : mClassSize(classSize) { 
+    mClassName = PL_strdup(className);
+    Clear(&mNewStats);
+    Clear(&mAllStats);
+    mTotalLeaked = 0;
+  }
+
+  ~BloatEntry() {
+    PL_strfree(mClassName);
+  }
+
+  PRUint32 GetClassSize() { return (PRUint32)mClassSize; }
+  const char* GetClassName() { return mClassName; }
+
+  static void Clear(nsTraceRefcntStats* stats) {
+    stats->mAddRefs = 0;
+    stats->mReleases = 0;
+    stats->mCreates = 0;
+    stats->mDestroys = 0;
+    stats->mRefsOutstandingTotal = 0;
+    stats->mRefsOutstandingSquared = 0;
+    stats->mObjsOutstandingTotal = 0;
+    stats->mObjsOutstandingSquared = 0;
+  }
+
+  void Accumulate() {
+      mAllStats.mAddRefs += mNewStats.mAddRefs;
+      mAllStats.mReleases += mNewStats.mReleases;
+      mAllStats.mCreates += mNewStats.mCreates;
+      mAllStats.mDestroys += mNewStats.mDestroys;
+      mAllStats.mRefsOutstandingTotal += mNewStats.mRefsOutstandingTotal;
+      mAllStats.mRefsOutstandingSquared += mNewStats.mRefsOutstandingSquared;
+      mAllStats.mObjsOutstandingTotal += mNewStats.mObjsOutstandingTotal;
+      mAllStats.mObjsOutstandingSquared += mNewStats.mObjsOutstandingSquared;
+      Clear(&mNewStats);
+  }
+
+  void AddRef(nsrefcnt refcnt) {
+    mNewStats.mAddRefs++;
+    if (refcnt == 1) {
+      Ctor();
+    }
+    AccountRefs();
+  }
+
+  void Release(nsrefcnt refcnt) {
+    mNewStats.mReleases++;
+    if (refcnt == 0) {
+      Dtor();
+    }
+    AccountRefs();
+  }
+
+  void Ctor() {
+    mNewStats.mCreates++;
+    AccountObjs();
+  }
+
+  void Dtor() {
+    mNewStats.mDestroys++;
+    AccountObjs();
+  }
+
+  void AccountRefs() {
+    PRInt32 cnt = (mNewStats.mAddRefs - mNewStats.mReleases);
+    mNewStats.mRefsOutstandingTotal += cnt;
+    mNewStats.mRefsOutstandingSquared += cnt * cnt;
+  }
+
+  void AccountObjs() {
+    PRInt32 cnt = (mNewStats.mCreates - mNewStats.mDestroys);
+    mNewStats.mObjsOutstandingTotal += cnt;
+    mNewStats.mObjsOutstandingSquared += cnt * cnt;
+  }
+
+  static PRIntn PR_CALLBACK DumpEntry(PLHashEntry *he, PRIntn i, void *arg) {
+    BloatEntry* entry = (BloatEntry*)he->value;
+    if (entry) {
+      entry->Accumulate();
+      NS_STATIC_CAST(nsVoidArray*, arg)->AppendElement(entry);
+    }
+    return HT_ENUMERATE_NEXT;
+  }
+
+  static PRIntn PR_CALLBACK TotalEntries(PLHashEntry *he, PRIntn i, void *arg) {
+    BloatEntry* entry = (BloatEntry*)he->value;
+    if (entry && nsCRT::strcmp(entry->mClassName, "TOTAL") != 0) {
+      entry->Total((BloatEntry*)arg);
+    }
+    return HT_ENUMERATE_NEXT;
+  }
+
+  void Total(BloatEntry* total) {
+    total->mAllStats.mAddRefs += mNewStats.mAddRefs + mAllStats.mAddRefs;
+    total->mAllStats.mReleases += mNewStats.mReleases + mAllStats.mReleases;
+    total->mAllStats.mCreates += mNewStats.mCreates + mAllStats.mCreates;
+    total->mAllStats.mDestroys += mNewStats.mDestroys + mAllStats.mDestroys;
+    total->mAllStats.mRefsOutstandingTotal += mNewStats.mRefsOutstandingTotal + mAllStats.mRefsOutstandingTotal;
+    total->mAllStats.mRefsOutstandingSquared += mNewStats.mRefsOutstandingSquared + mAllStats.mRefsOutstandingSquared;
+    total->mAllStats.mObjsOutstandingTotal += mNewStats.mObjsOutstandingTotal + mAllStats.mObjsOutstandingTotal;
+    total->mAllStats.mObjsOutstandingSquared += mNewStats.mObjsOutstandingSquared + mAllStats.mObjsOutstandingSquared;
+    PRInt32 count = (mNewStats.mCreates + mAllStats.mCreates);
+    total->mClassSize += mClassSize * count;    // adjust for average in DumpTotal
+    total->mTotalLeaked += (PRInt32)(mClassSize *
+                                     ((mNewStats.mCreates + mAllStats.mCreates)
+                                      -(mNewStats.mDestroys + mAllStats.mDestroys)));
+  }
+
+  nsresult DumpTotal(PRUint32 nClasses, FILE* out) {
+    mClassSize /= mAllStats.mCreates;
+    return Dump(-1, out, nsTraceRefcntImpl::ALL_STATS);
+  }
+
+  static PRBool HaveLeaks(nsTraceRefcntStats* stats) {
+    return ((stats->mAddRefs != stats->mReleases) ||
+            (stats->mCreates != stats->mDestroys));
+  }
+
+  static nsresult PrintDumpHeader(FILE* out, const char* msg) {
+    fprintf(out, "\n== BloatView: %s\n\n", msg);
+    fprintf(out, 
+        "     |<----------------Class--------------->|<-----Bytes------>|<----------------Objects---------------->|<--------------References-------------->|\n");
+    fprintf(out,
+        "                                              Per-Inst   Leaked    Total      Rem      Mean       StdDev     Total      Rem      Mean       StdDev\n");
+    return NS_OK;
+  }
+
+  nsresult Dump(PRIntn i, FILE* out, nsTraceRefcntImpl::StatisticsType type) {
+    nsTraceRefcntStats* stats = (type == nsTraceRefcntImpl::NEW_STATS) ? &mNewStats : &mAllStats;
+    if (gLogLeaksOnly && !HaveLeaks(stats)) {
+      return NS_OK;
+    }
+
+    double meanRefs, stddevRefs;
+    NS_MeanAndStdDev(stats->mAddRefs + stats->mReleases, 
+                     stats->mRefsOutstandingTotal, 
+                     stats->mRefsOutstandingSquared,
+                     &meanRefs, &stddevRefs);
+
+    double meanObjs, stddevObjs;
+    NS_MeanAndStdDev(stats->mCreates + stats->mDestroys,
+                     stats->mObjsOutstandingTotal, 
+                     stats->mObjsOutstandingSquared,
+                     &meanObjs, &stddevObjs);
+
+    if ((stats->mAddRefs - stats->mReleases) != 0 ||
+        stats->mAddRefs != 0 ||
+        meanRefs != 0 ||
+        stddevRefs != 0 ||
+        (stats->mCreates - stats->mDestroys) != 0 ||
+        stats->mCreates != 0 ||
+        meanObjs != 0 ||
+        stddevObjs != 0) {
+      fprintf(out, "%4d %-40.40s %8d %8d %8d %8d (%8.2f +/- %8.2f) %8d %8d (%8.2f +/- %8.2f)\n",
+              i+1, mClassName,
+              (PRInt32)mClassSize,
+              (nsCRT::strcmp(mClassName, "TOTAL"))
+                  ?(PRInt32)((stats->mCreates - stats->mDestroys) * mClassSize)
+                  :mTotalLeaked,
+              stats->mCreates,
+              (stats->mCreates - stats->mDestroys),
+              meanObjs,
+              stddevObjs, 
+              stats->mAddRefs,
+              (stats->mAddRefs - stats->mReleases),
+              meanRefs,
+              stddevRefs);
+    }
+    return NS_OK;
+  }
+
+protected:
+  char*         mClassName;
+  double        mClassSize;     // this is stored as a double because of the way we compute the avg class size for total bloat
+  PRInt32       mTotalLeaked; // used only for TOTAL entry
+  nsTraceRefcntStats mNewStats;
+  nsTraceRefcntStats mAllStats;
+};
+
+static void PR_CALLBACK
+BloatViewFreeEntry(void *pool, PLHashEntry *he, PRUintn flag)
+{
+#if defined(XP_MAC)
+#pragma unused (pool)
+#endif
+
+    if (flag == HT_FREE_ENTRY) {
+        BloatEntry* entry = NS_REINTERPRET_CAST(BloatEntry*,he->value);
+        delete entry;
+        PR_Free(he);
+    }
+}
+
+const static PLHashAllocOps bloatViewHashAllocOps = {
+    DefaultAllocTable, DefaultFreeTable,
+    DefaultAllocEntry, BloatViewFreeEntry
+};
+
+static void
+RecreateBloatView()
+{
+  gBloatView = PL_NewHashTable(256, 
+                               PL_HashString,
+                               PL_CompareStrings,
+                               PL_CompareValues,
+                               &bloatViewHashAllocOps, NULL);
+}
+
+static BloatEntry*
+GetBloatEntry(const char* aTypeName, PRUint32 aInstanceSize)
+{
+  if (!gBloatView) {
+    RecreateBloatView();
+  }
+  BloatEntry* entry = NULL;
+  if (gBloatView) {
+    entry = (BloatEntry*)PL_HashTableLookup(gBloatView, aTypeName);
+    if (entry == NULL && aInstanceSize > 0) {
+
+      entry = new BloatEntry(aTypeName, aInstanceSize);
+      PLHashEntry* e = PL_HashTableAdd(gBloatView, aTypeName, entry);
+      if (e == NULL) {
+        delete entry;
+        entry = NULL;
+      }
+    } else {
+      NS_ASSERTION(aInstanceSize == 0 || 
+                   entry->GetClassSize() == aInstanceSize, 
+                   "bad size recorded");
+    }
+  }
+  return entry;
+}
+
+static PRIntn PR_CALLBACK DumpSerialNumbers(PLHashEntry* aHashEntry, PRIntn aIndex, void* aClosure)
+{
+  serialNumberRecord* record = NS_REINTERPRET_CAST(serialNumberRecord *,aHashEntry->value);
+#ifdef HAVE_CPP_DYNAMIC_CAST_TO_VOID_PTR
+  fprintf((FILE*) aClosure, "%d (%d references; %d from COMPtrs)\n",
+                            record->serialNumber,
+                            record->refCount,
+                            record->COMPtrCount);
+#else
+  fprintf((FILE*) aClosure, "%d (%d references)\n",
+                            record->serialNumber,
+                            record->refCount);
+#endif
+  return HT_ENUMERATE_NEXT;
+}
+
+
+#endif /* NS_BUILD_REFCNT_LOGGING */
+
+nsresult
+nsTraceRefcntImpl::DumpStatistics(StatisticsType type, FILE* out)
+{
+  nsresult rv = NS_OK;
+#ifdef NS_BUILD_REFCNT_LOGGING
+  if (gBloatLog == nsnull || gBloatView == nsnull) {
+    return NS_ERROR_FAILURE;
+  }
+  if (out == nsnull) {
+    out = gBloatLog;
+  }
+
+  LOCK_TRACELOG();
+
+  PRBool wasLogging = gLogging;
+  gLogging = PR_FALSE;  // turn off logging for this method
+  
+  const char* msg;
+  if (type == NEW_STATS) {
+    if (gLogLeaksOnly)
+      msg = "NEW (incremental) LEAK STATISTICS";
+    else
+      msg = "NEW (incremental) LEAK AND BLOAT STATISTICS";
+  }
+  else {
+    if (gLogLeaksOnly)
+      msg = "ALL (cumulative) LEAK STATISTICS";
+    else
+      msg = "ALL (cumulative) LEAK AND BLOAT STATISTICS";
+  }
+  rv = BloatEntry::PrintDumpHeader(out, msg);
+  if (NS_FAILED(rv)) goto done;
+
+  {
+    BloatEntry total("TOTAL", 0);
+    PL_HashTableEnumerateEntries(gBloatView, BloatEntry::TotalEntries, &total);
+    total.DumpTotal(gBloatView->nentries, out);
+
+    nsVoidArray entries;
+    PL_HashTableEnumerateEntries(gBloatView, BloatEntry::DumpEntry, &entries);
+
+    fprintf(stdout, "nsTraceRefcntImpl::DumpStatistics: %d entries\n",
+           entries.Count());
+
+    // Sort the entries alphabetically by classname.
+    PRInt32 i, j;
+    for (i = entries.Count() - 1; i >= 1; --i) {
+      for (j = i - 1; j >= 0; --j) {
+        BloatEntry* left  = NS_STATIC_CAST(BloatEntry*, entries[i]);
+        BloatEntry* right = NS_STATIC_CAST(BloatEntry*, entries[j]);
+
+        if (PL_strcmp(left->GetClassName(), right->GetClassName()) < 0) {
+          entries.ReplaceElementAt(right, i);
+          entries.ReplaceElementAt(left, j);
+        }
+      }
+    }
+
+    // Enumerate from back-to-front, so things come out in alpha order
+    for (i = 0; i < entries.Count(); ++i) {
+      BloatEntry* entry = NS_STATIC_CAST(BloatEntry*, entries[i]);
+      entry->Dump(i, out, type);
+    }
+  }
+
+  if (gSerialNumbers) {
+    fprintf(out, "\n\nSerial Numbers of Leaked Objects:\n");
+    PL_HashTableEnumerateEntries(gSerialNumbers, DumpSerialNumbers, out);
+  }
+
+done:
+  gLogging = wasLogging;
+  UNLOCK_TRACELOG();
+#endif
+  return rv;
+}
+
+void
+nsTraceRefcntImpl::ResetStatistics()
+{
+#ifdef NS_BUILD_REFCNT_LOGGING
+  LOCK_TRACELOG();
+  if (gBloatView) {
+    PL_HashTableDestroy(gBloatView);
+    gBloatView = nsnull;
+  }
+  UNLOCK_TRACELOG();
+#endif
+}
+
+#ifdef NS_BUILD_REFCNT_LOGGING
+static PRBool LogThisType(const char* aTypeName)
+{
+  void* he = PL_HashTableLookup(gTypesToLog, aTypeName);
+  return nsnull != he;
+}
+
+static PRInt32 GetSerialNumber(void* aPtr, PRBool aCreate)
+{
+#ifdef GC_LEAK_DETECTOR
+  // need to disguise this pointer, so the table won't keep the object alive.
+  aPtr = (void*) ~PLHashNumber(aPtr);
+#endif
+  PLHashEntry** hep = PL_HashTableRawLookup(gSerialNumbers, PLHashNumber(NS_PTR_TO_INT32(aPtr)), aPtr);
+  if (hep && *hep) {
+    return PRInt32((NS_REINTERPRET_CAST(serialNumberRecord*,(*hep)->value))->serialNumber);
+  }
+  else if (aCreate) {
+    serialNumberRecord *record = PR_NEW(serialNumberRecord);
+    record->serialNumber = ++gNextSerialNumber;
+    record->refCount = 0;
+    record->COMPtrCount = 0;
+    PL_HashTableRawAdd(gSerialNumbers, hep, PLHashNumber(NS_PTR_TO_INT32(aPtr)), aPtr, NS_REINTERPRET_CAST(void*,record));
+    return gNextSerialNumber;
+  }
+  else {
+    return 0;
+  }
+}
+
+static PRInt32* GetRefCount(void* aPtr)
+{
+#ifdef GC_LEAK_DETECTOR
+  // need to disguise this pointer, so the table won't keep the object alive.
+  aPtr = (void*) ~PLHashNumber(aPtr);
+#endif
+  PLHashEntry** hep = PL_HashTableRawLookup(gSerialNumbers, PLHashNumber(NS_PTR_TO_INT32(aPtr)), aPtr);
+  if (hep && *hep) {
+    return &((NS_REINTERPRET_CAST(serialNumberRecord*,(*hep)->value))->refCount);
+  } else {
+    return nsnull;
+  }
+}
+
+static PRInt32* GetCOMPtrCount(void* aPtr)
+{
+#ifdef GC_LEAK_DETECTOR
+  // need to disguise this pointer, so the table won't keep the object alive.
+  aPtr = (void*) ~PLHashNumber(aPtr);
+#endif
+  PLHashEntry** hep = PL_HashTableRawLookup(gSerialNumbers, PLHashNumber(NS_PTR_TO_INT32(aPtr)), aPtr);
+  if (hep && *hep) {
+    return &((NS_REINTERPRET_CAST(serialNumberRecord*,(*hep)->value))->COMPtrCount);
+  } else {
+    return nsnull;
+  }
+}
+
+static void RecycleSerialNumberPtr(void* aPtr)
+{
+#ifdef GC_LEAK_DETECTOR
+  // need to disguise this pointer, so the table won't keep the object alive.
+  aPtr = (void*) ~PLHashNumber(aPtr);
+#endif
+  PL_HashTableRemove(gSerialNumbers, aPtr);
+}
+
+static PRBool LogThisObj(PRInt32 aSerialNumber)
+{
+  return nsnull != PL_HashTableLookup(gObjectsToLog, (const void*)(uintptr_t)(aSerialNumber));
+}
+
+static PRBool InitLog(const char* envVar, const char* msg, FILE* *result)
+{
+  const char* value = getenv(envVar);
+  if (value) {
+    if (nsCRT::strcmp(value, "1") == 0) {
+      *result = stdout;
+      fprintf(stdout, "### %s defined -- logging %s to stdout\n", 
+              envVar, msg);
+      return PR_TRUE;
+    }
+    else if (nsCRT::strcmp(value, "2") == 0) {
+      *result = stderr;
+      fprintf(stdout, "### %s defined -- logging %s to stderr\n", 
+              envVar, msg);
+      return PR_TRUE;
+    }
+    else {
+      FILE *stream = ::fopen(value, "w");
+      if (stream != NULL) {
+        *result = stream;
+        fprintf(stdout, "### %s defined -- logging %s to %s\n", 
+                envVar, msg, value);
+        return PR_TRUE;
+      }
+      else {
+        fprintf(stdout, "### %s defined -- unable to log %s to %s\n", 
+                envVar, msg, value);
+        return PR_FALSE;
+      }
+    }
+  }
+  return PR_FALSE;
+}
+
+
+static PLHashNumber PR_CALLBACK HashNumber(const void* aKey)
+{
+  return PLHashNumber(NS_PTR_TO_INT32(aKey));
+}
+
+static void InitTraceLog(void)
+{
+  if (gInitialized) return;
+  gInitialized = PR_TRUE;
+
+#if defined(XP_MAC) && !TARGET_CARBON
+  // this can get called before Toolbox has been initialized.
+  InitializeMacToolbox();
+#endif
+
+  PRBool defined;
+  defined = InitLog("XPCOM_MEM_BLOAT_LOG", "bloat/leaks", &gBloatLog);
+  if (!defined)
+    gLogLeaksOnly = InitLog("XPCOM_MEM_LEAK_LOG", "leaks", &gBloatLog);
+  if (defined || gLogLeaksOnly) {
+    RecreateBloatView();
+    if (!gBloatView) {
+      NS_WARNING("out of memory");
+      gBloatLog = nsnull;
+      gLogLeaksOnly = PR_FALSE;
+    }
+  }
+
+  (void)InitLog("XPCOM_MEM_REFCNT_LOG", "refcounts", &gRefcntsLog);
+
+  (void)InitLog("XPCOM_MEM_ALLOC_LOG", "new/delete", &gAllocLog);
+
+  defined = InitLog("XPCOM_MEM_LEAKY_LOG", "for leaky", &gLeakyLog);
+  if (defined) {
+    gLogToLeaky = PR_TRUE;
+    void* p = nsnull;
+    void* q = nsnull;
+#ifdef HAVE_LIBDL
+    p = dlsym(0, "__log_addref");
+    q = dlsym(0, "__log_release");
+#endif
+    if (p && q) {
+      leakyLogAddRef = (void (*)(void*,int,int)) p;
+      leakyLogRelease = (void (*)(void*,int,int)) q;
+    }
+    else {
+      gLogToLeaky = PR_FALSE;
+      fprintf(stdout, "### ERROR: XPCOM_MEM_LEAKY_LOG defined, but can't locate __log_addref and __log_release symbols\n");
+      fflush(stdout);
+    }
+  }
+
+  const char* classes = getenv("XPCOM_MEM_LOG_CLASSES");
+
+#ifdef HAVE_CPP_DYNAMIC_CAST_TO_VOID_PTR
+  if (classes) {
+    (void)InitLog("XPCOM_MEM_COMPTR_LOG", "nsCOMPtr", &gCOMPtrLog);
+  } else {
+    if (getenv("XPCOM_MEM_COMPTR_LOG")) {
+      fprintf(stdout, "### XPCOM_MEM_COMPTR_LOG defined -- but XPCOM_MEM_LOG_CLASSES is not defined\n");
+    }
+  }
+#else
+  const char* comptr_log = getenv("XPCOM_MEM_COMPTR_LOG");
+  if (comptr_log) {
+    fprintf(stdout, "### XPCOM_MEM_COMPTR_LOG defined -- but it will not work without dynamic_cast\n");
+  }
+#endif
+
+  if (classes) {
+    // if XPCOM_MEM_LOG_CLASSES was set to some value, the value is interpreted
+    // as a list of class names to track
+    gTypesToLog = PL_NewHashTable(256,
+                                  PL_HashString,
+                                  PL_CompareStrings,
+                                  PL_CompareValues,
+                                  &typesToLogHashAllocOps, NULL);
+    if (!gTypesToLog) {
+      NS_WARNING("out of memory");
+      fprintf(stdout, "### XPCOM_MEM_LOG_CLASSES defined -- unable to log specific classes\n");
+    }
+    else {
+      fprintf(stdout, "### XPCOM_MEM_LOG_CLASSES defined -- only logging these classes: ");
+      const char* cp = classes;
+      for (;;) {
+        char* cm = (char*) strchr(cp, ',');
+        if (cm) {
+          *cm = '\0';
+        }
+        PL_HashTableAdd(gTypesToLog, nsCRT::strdup(cp), (void*)1);
+        fprintf(stdout, "%s ", cp);
+        if (!cm) break;
+        *cm = ',';
+        cp = cm + 1;
+      }
+      fprintf(stdout, "\n");
+    }
+
+    gSerialNumbers = PL_NewHashTable(256,
+                                     HashNumber,
+                                     PL_CompareValues,
+                                     PL_CompareValues,
+                                     &serialNumberHashAllocOps, NULL);
+
+
+  }
+
+  const char* objects = getenv("XPCOM_MEM_LOG_OBJECTS");
+  if (objects) {
+    gObjectsToLog = PL_NewHashTable(256,
+                                    HashNumber,
+                                    PL_CompareValues,
+                                    PL_CompareValues,
+                                    NULL, NULL);
+
+    if (!gObjectsToLog) {
+      NS_WARNING("out of memory");
+      fprintf(stdout, "### XPCOM_MEM_LOG_OBJECTS defined -- unable to log specific objects\n");
+    }
+    else if (! (gRefcntsLog || gAllocLog || gCOMPtrLog)) {
+      fprintf(stdout, "### XPCOM_MEM_LOG_OBJECTS defined -- but none of XPCOM_MEM_(REFCNT|ALLOC|COMPTR)_LOG is defined\n");
+    }
+    else {
+      fprintf(stdout, "### XPCOM_MEM_LOG_OBJECTS defined -- only logging these objects: ");
+      const char* cp = objects;
+      for (;;) {
+        char* cm = (char*) strchr(cp, ',');
+        if (cm) {
+          *cm = '\0';
+        }
+        PRInt32 top = 0;
+        PRInt32 bottom = 0;
+        while (*cp) {
+          if (*cp == '-') {
+            bottom = top;
+            top = 0;
+            ++cp;
+          }
+          top *= 10;
+          top += *cp - '0';
+          ++cp;
+        }
+        if (!bottom) {
+          bottom = top;
+        }
+        for(PRInt32 serialno = bottom; serialno <= top; serialno++) {
+          PL_HashTableAdd(gObjectsToLog, (const void*)serialno, (void*)1);
+          fprintf(stdout, "%d ", serialno);
+        }
+        if (!cm) break;
+        *cm = ',';
+        cp = cm + 1;
+      }
+      fprintf(stdout, "\n");
+    }
+  }
+
+
+  if (gBloatLog || gRefcntsLog || gAllocLog || gLeakyLog || gCOMPtrLog) {
+    gLogging = PR_TRUE;
+  }
+
+  gTraceLock = PR_NewLock();
+}
+
+#endif
+
+#if defined(_WIN32) && defined(_M_IX86) // WIN32 x86 stack walking code
+#include "nsStackFrameWin.h"
+void
+nsTraceRefcntImpl::WalkTheStack(FILE* aStream)
+{
+  DumpStackToFile(aStream);
+}
+
+// WIN32 x86 stack walking code
+// i386 or PPC Linux stackwalking code or Solaris
+#elif (defined(linux) && !defined(VBOX) && defined(__GLIBC__) && (defined(__i386) || defined(PPC))) || (defined(__sun) && (defined(__sparc) || defined(sparc) || defined(__i386) || defined(i386)))
+#include "nsStackFrameUnix.h"
+void
+nsTraceRefcntImpl::WalkTheStack(FILE* aStream)
+{
+  DumpStackToFile(aStream);
+}
+
+#elif defined(XP_MAC)
+
+/**
+ * Stack walking code for the Mac OS.
+ */
+
+#include "gc_fragments.h"
+
+#include <typeinfo>
+
+extern "C" {
+void MWUnmangle(const char *mangled_name, char *unmangled_name, size_t buffersize);
+}
+
+struct traceback_table {
+	long zero;
+	long magic;
+	long reserved;
+	long codeSize;
+	short nameLength;
+	char name[2];
+};
+
+static char* pc2name(long* pc, char name[], long size)
+{
+	name[0] = '\0';
+	
+	// make sure pc is instruction aligned (at least).
+	if (UInt32(pc) == (UInt32(pc) & 0xFFFFFFFC)) {
+		long instructionsToLook = 4096;
+		long* instruction = (long*)pc;
+		
+		// look for the traceback table.
+		while (instructionsToLook--) {
+			if (instruction[0] == 0x4E800020 && instruction[1] == 0x00000000) {
+				traceback_table* tb = (traceback_table*)&instruction[1];
+				memcpy(name, tb->name + 1, --nameLength);
+				name[nameLength] = '\0';
+				break;
+			}
+			++instruction;
+		}
+	}
+	
+	return name;
+}
+
+struct stack_frame {
+	stack_frame*	next;				// savedSP
+	void*			savedCR;
+	void*			savedLR;
+	void*			reserved0;
+	void*			reserved1;
+	void*			savedTOC;
+};
+
+static asm stack_frame* getStackFrame() 
+{
+	mr		r3, sp
+	blr
+}
+
+NS_COM void
+nsTraceRefcntImpl::WalkTheStack(FILE* aStream)
+{
+  stack_frame* currentFrame = getStackFrame();    // WalkTheStack's frame.
+	currentFrame = currentFrame->next;	            // WalkTheStack's caller's frame.
+	currentFrame = currentFrame->next;              // WalkTheStack's caller's caller's frame.
+    
+	while (true) {
+		// LR saved at 8(SP) in each frame. subtract 4 to get address of calling instruction.
+		void* pc = currentFrame->savedLR;
+
+		// convert PC to name, unmangle it, and generate source location, if possible.
+		static char symbol_name[1024], unmangled_name[1024], file_name[256]; UInt32 file_offset;
+		
+     	if (GC_address_to_source((char*)pc, symbol_name, file_name, &file_offset)) {
+			MWUnmangle(symbol_name, unmangled_name, sizeof(unmangled_name));
+     		fprintf(aStream, "%s[%s,%ld]\n", unmangled_name, file_name, file_offset);
+     	} else {
+ 		    pc2name((long*)pc, symbol_name, sizeof(symbol_name));
+			MWUnmangle(symbol_name, unmangled_name, sizeof(unmangled_name));
+    		fprintf(aStream, "%s(0x%08X)\n", unmangled_name, pc);
+     	}
+
+		currentFrame = currentFrame->next;
+		// the bottom-most frame is marked as pointing to NULL, or is ODD if a 68K transition frame.
+		if (currentFrame == NULL || UInt32(currentFrame) & 0x1)
+			break;
+	}
+}
+
+#else // unsupported platform.
+
+void
+nsTraceRefcntImpl::WalkTheStack(FILE* aStream)
+{
+	fprintf(aStream, "write me, dammit!\n");
+}
+
+#endif
+
+//----------------------------------------------------------------------
+
+// This thing is exported by libstdc++
+// Yes, this is a gcc only hack
+#if defined(MOZ_DEMANGLE_SYMBOLS)
+#include <cxxabi.h>
+#include <stdlib.h> // for free()
+#endif // MOZ_DEMANGLE_SYMBOLS
+
+NS_COM void 
+nsTraceRefcntImpl::DemangleSymbol(const char * aSymbol, 
+                              char * aBuffer,
+                              int aBufLen)
+{
+  NS_ASSERTION(nsnull != aSymbol,"null symbol");
+  NS_ASSERTION(nsnull != aBuffer,"null buffer");
+  NS_ASSERTION(aBufLen >= 32 ,"pulled 32 out of you know where");
+
+  aBuffer[0] = '\0';
+
+#if defined(MOZ_DEMANGLE_SYMBOLS)
+ /* See demangle.h in the gcc source for the voodoo */
+  char * demangled = abi::__cxa_demangle(aSymbol,0,0,0);
+
+  if (demangled)
+  {
+    strncpy(aBuffer,demangled,aBufLen);
+    free(demangled);
+  }
+#endif // MOZ_DEMANGLE_SYMBOLS
+}
+
+
+//----------------------------------------------------------------------
+
+NS_COM void
+nsTraceRefcntImpl::LoadLibrarySymbols(const char* aLibraryName,
+                                  void* aLibrayHandle)
+{
+#ifdef NS_BUILD_REFCNT_LOGGING
+#if defined(_WIN32) && defined(_M_IX86) /* Win32 x86 only */
+  if (!gInitialized)
+    InitTraceLog();
+
+  if (gAllocLog || gRefcntsLog) {
+    fprintf(stdout, "### Loading symbols for %s\n", aLibraryName);
+    fflush(stdout);
+
+    HANDLE myProcess = ::GetCurrentProcess();    
+    BOOL ok = EnsureSymInitialized();
+    if (ok) {
+      const char* baseName = aLibraryName;
+      // just get the base name of the library if a full path was given:
+      PRInt32 len = strlen(aLibraryName);
+      for (PRInt32 i = len - 1; i >= 0; i--) {
+        if (aLibraryName[i] == '\\') {
+          baseName = &aLibraryName[i + 1];
+          break;
+        }
+      }
+      DWORD baseAddr = _SymLoadModule(myProcess,
+                                     NULL,
+                                     (char*)baseName,
+                                     (char*)baseName,
+                                     0,
+                                     0);
+      ok = (baseAddr != nsnull);
+    }
+    if (!ok) {
+      LPVOID lpMsgBuf;
+      FormatMessage( 
+        FORMAT_MESSAGE_ALLOCATE_BUFFER | 
+        FORMAT_MESSAGE_FROM_SYSTEM | 
+        FORMAT_MESSAGE_IGNORE_INSERTS,
+        NULL,
+        GetLastError(),
+        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
+        (LPTSTR) &lpMsgBuf,
+        0,
+        NULL 
+        );
+      fprintf(stdout, "### ERROR: LoadLibrarySymbols for %s: %s\n",
+              aLibraryName, lpMsgBuf);
+      fflush(stdout);
+      LocalFree( lpMsgBuf );
+    }
+  }
+#endif
+#endif
+}
+
+//----------------------------------------------------------------------
+
+
+
+
+
+
+// don't use the logging ones. :-)
+NS_IMETHODIMP_(nsrefcnt) nsTraceRefcntImpl::AddRef(void)
+{
+  NS_PRECONDITION(PRInt32(mRefCnt) >= 0, "illegal refcnt");
+  ++mRefCnt;
+  return mRefCnt;
+}
+
+NS_IMETHODIMP_(nsrefcnt) nsTraceRefcntImpl::Release(void)                                
+{                                                                             
+  NS_PRECONDITION(0 != mRefCnt, "dup release");                               
+  --mRefCnt;                                                                  
+  if (mRefCnt == 0) {                                                         
+    mRefCnt = 1; /* stabilize */                                              
+    delete this;                                                              
+    return 0;                                                                 
+  }
+  return mRefCnt;                                                             
+}
+
+NS_IMPL_QUERY_INTERFACE1(nsTraceRefcntImpl, nsITraceRefcnt)
+
+nsTraceRefcntImpl::nsTraceRefcntImpl()
+{
+  /* member initializers and constructor code */
+}
+
+NS_IMETHODIMP 
+nsTraceRefcntImpl::LogAddRef(void* aPtr,
+                             nsrefcnt aRefcnt,
+                             const char* aClazz,
+                             PRUint32 classSize)
+{
+#ifdef NS_BUILD_REFCNT_LOGGING
+  ASSERT_ACTIVITY_IS_LEGAL;
+  if (!gInitialized)
+    InitTraceLog();
+  if (gLogging) {
+    LOCK_TRACELOG();
+
+    if (gBloatLog) {
+      BloatEntry* entry = GetBloatEntry(aClazz, classSize);
+      if (entry) {
+        entry->AddRef(aRefcnt);
+      }
+    }
+
+    // Here's the case where neither NS_NEWXPCOM nor MOZ_COUNT_CTOR were used,
+    // yet we still want to see creation information:
+
+    PRBool loggingThisType = (!gTypesToLog || LogThisType(aClazz));
+    PRInt32 serialno = 0;
+    if (gSerialNumbers && loggingThisType) {
+      serialno = GetSerialNumber(aPtr, aRefcnt == 1);
+      PRInt32* count = GetRefCount(aPtr);
+      if(count)
+        (*count)++;
+
+    }
+
+    PRBool loggingThisObject = (!gObjectsToLog || LogThisObj(serialno));
+    if (aRefcnt == 1 && gAllocLog && loggingThisType && loggingThisObject) {
+      fprintf(gAllocLog, "\n<%s> 0x%08X %d Create\n",
+              aClazz, NS_PTR_TO_INT32(aPtr), serialno);
+      WalkTheStack(gAllocLog);
+    }
+
+    if (gRefcntsLog && loggingThisType && loggingThisObject) {
+      if (gLogToLeaky) {
+        (*leakyLogAddRef)(aPtr, aRefcnt - 1, aRefcnt);
+      }
+      else {        
+          // Can't use PR_LOG(), b/c it truncates the line
+          fprintf(gRefcntsLog,
+                  "\n<%s> 0x%08X %d AddRef %d\n", aClazz, NS_PTR_TO_INT32(aPtr), serialno, aRefcnt);       
+          WalkTheStack(gRefcntsLog);
+          fflush(gRefcntsLog);
+      }
+    }
+    UNLOCK_TRACELOG();
+  }
+#endif
+  return NS_OK;
+}
+
+NS_IMETHODIMP 
+nsTraceRefcntImpl::LogRelease(void* aPtr,
+                          nsrefcnt aRefcnt,
+                          const char* aClazz)
+{
+#ifdef NS_BUILD_REFCNT_LOGGING
+  ASSERT_ACTIVITY_IS_LEGAL;
+  if (!gInitialized)
+    InitTraceLog();
+  if (gLogging) {
+    LOCK_TRACELOG();
+
+    if (gBloatLog) {
+      BloatEntry* entry = GetBloatEntry(aClazz, 0);
+      if (entry) {
+        entry->Release(aRefcnt);
+      }
+    }
+
+    PRBool loggingThisType = (!gTypesToLog || LogThisType(aClazz));
+    PRInt32 serialno = 0;
+    if (gSerialNumbers && loggingThisType) {
+      serialno = GetSerialNumber(aPtr, PR_FALSE);
+      PRInt32* count = GetRefCount(aPtr);
+      if(count)
+        (*count)--;
+
+    }
+
+    PRBool loggingThisObject = (!gObjectsToLog || LogThisObj(serialno));
+    if (gRefcntsLog && loggingThisType && loggingThisObject) {
+      if (gLogToLeaky) {
+        (*leakyLogRelease)(aPtr, aRefcnt + 1, aRefcnt);
+      }
+      else {
+          // Can't use PR_LOG(), b/c it truncates the line
+          fprintf(gRefcntsLog,
+                  "\n<%s> 0x%08X %d Release %d\n", aClazz, NS_PTR_TO_INT32(aPtr), serialno, aRefcnt);
+          WalkTheStack(gRefcntsLog);
+          fflush(gRefcntsLog);
+      }
+    }
+
+    // Here's the case where neither NS_DELETEXPCOM nor MOZ_COUNT_DTOR were used,
+    // yet we still want to see deletion information:
+
+    if (aRefcnt == 0 && gAllocLog && loggingThisType && loggingThisObject) {
+      fprintf(gAllocLog,
+              "\n<%s> 0x%08X %d Destroy\n",
+              aClazz, NS_PTR_TO_INT32(aPtr), serialno);
+      WalkTheStack(gAllocLog);
+    }
+
+    if (aRefcnt == 0 && gSerialNumbers && loggingThisType) {
+      RecycleSerialNumberPtr(aPtr);
+    }
+
+    UNLOCK_TRACELOG();
+  }
+#endif
+  return NS_OK;
+}
+
+NS_IMETHODIMP 
+nsTraceRefcntImpl::LogCtor(void* aPtr,
+                           const char* aType,
+                           PRUint32 aInstanceSize)
+{
+#ifdef NS_BUILD_REFCNT_LOGGING
+  ASSERT_ACTIVITY_IS_LEGAL;
+  if (!gInitialized)
+    InitTraceLog();
+
+  if (gLogging) {
+    LOCK_TRACELOG();
+
+    if (gBloatLog) {
+      BloatEntry* entry = GetBloatEntry(aType, aInstanceSize);
+      if (entry) {
+        entry->Ctor();
+      }
+    }
+
+    PRBool loggingThisType = (!gTypesToLog || LogThisType(aType));
+    PRInt32 serialno = 0;
+    if (gSerialNumbers && loggingThisType) {
+      serialno = GetSerialNumber(aPtr, PR_TRUE);
+    }
+
+    PRBool loggingThisObject = (!gObjectsToLog || LogThisObj(serialno));
+    if (gAllocLog && loggingThisType && loggingThisObject) {
+      fprintf(gAllocLog, "\n<%s> 0x%08X %d Ctor (%d)\n",
+             aType, NS_PTR_TO_INT32(aPtr), serialno, aInstanceSize);
+      WalkTheStack(gAllocLog);
+    }
+
+    UNLOCK_TRACELOG();
+  }
+#endif
+  return NS_OK;
+}
+
+
+NS_IMETHODIMP 
+nsTraceRefcntImpl::LogDtor(void* aPtr, 
+                           const char* aType,
+                           PRUint32 aInstanceSize)
+{
+#ifdef NS_BUILD_REFCNT_LOGGING
+  ASSERT_ACTIVITY_IS_LEGAL;
+  if (!gInitialized)
+    InitTraceLog();
+
+  if (gLogging) {
+    LOCK_TRACELOG();
+
+    if (gBloatLog) {
+      BloatEntry* entry = GetBloatEntry(aType, aInstanceSize);
+      if (entry) {
+        entry->Dtor();
+      }
+    }
+
+    PRBool loggingThisType = (!gTypesToLog || LogThisType(aType));
+    PRInt32 serialno = 0;
+    if (gSerialNumbers && loggingThisType) {
+      serialno = GetSerialNumber(aPtr, PR_FALSE);
+      RecycleSerialNumberPtr(aPtr);
+    }
+
+    PRBool loggingThisObject = (!gObjectsToLog || LogThisObj(serialno));
+
+    // (If we're on a losing architecture, don't do this because we'll be
+    // using LogDeleteXPCOM instead to get file and line numbers.)
+    if (gAllocLog && loggingThisType && loggingThisObject) {
+      fprintf(gAllocLog, "\n<%s> 0x%08X %d Dtor (%d)\n",
+             aType, NS_PTR_TO_INT32(aPtr), serialno, aInstanceSize);
+      WalkTheStack(gAllocLog);
+    }
+
+    UNLOCK_TRACELOG();
+  }
+#endif
+  return NS_OK;
+}
+
+
+NS_IMETHODIMP 
+nsTraceRefcntImpl::LogAddCOMPtr(void* aCOMPtr,
+                            nsISupports* aObject)
+{
+#if defined(NS_BUILD_REFCNT_LOGGING) && defined(HAVE_CPP_DYNAMIC_CAST_TO_VOID_PTR)
+  // Get the most-derived object.
+  void *object = dynamic_cast<void *>(aObject);
+
+  // This is a very indirect way of finding out what the class is
+  // of the object being logged.  If we're logging a specific type,
+  // then 
+  if (!gTypesToLog || !gSerialNumbers) {
+    return NS_OK;
+  }
+  PRInt32 serialno = GetSerialNumber(object, PR_FALSE);
+  if (serialno == 0) {
+    return NS_OK;
+  }
+
+  if (!gInitialized)
+    InitTraceLog();
+  if (gLogging) {
+    LOCK_TRACELOG();
+
+    PRInt32* count = GetCOMPtrCount(object);
+    if(count)
+      (*count)++;
+
+    PRBool loggingThisObject = (!gObjectsToLog || LogThisObj(serialno));
+
+    if (gCOMPtrLog && loggingThisObject) {
+      fprintf(gCOMPtrLog, "\n<?> 0x%08X %d nsCOMPtrAddRef %d 0x%08X\n",
+              NS_PTR_TO_INT32(object), serialno, count?(*count):-1, NS_PTR_TO_INT32(aCOMPtr));
+      WalkTheStack(gCOMPtrLog);
+    }
+
+    UNLOCK_TRACELOG();
+  }
+#endif
+  return NS_OK;
+}
+
+
+NS_IMETHODIMP 
+nsTraceRefcntImpl::LogReleaseCOMPtr(void* aCOMPtr,
+                                    nsISupports* aObject)
+{
+#if defined(NS_BUILD_REFCNT_LOGGING) && defined(HAVE_CPP_DYNAMIC_CAST_TO_VOID_PTR)
+  // Get the most-derived object.
+  void *object = dynamic_cast<void *>(aObject);
+
+  // This is a very indirect way of finding out what the class is
+  // of the object being logged.  If we're logging a specific type,
+  // then 
+  if (!gTypesToLog || !gSerialNumbers) {
+    return NS_OK;
+  }
+  PRInt32 serialno = GetSerialNumber(object, PR_FALSE);
+  if (serialno == 0) {
+    return NS_OK;
+  }
+
+  if (!gInitialized)
+    InitTraceLog();
+  if (gLogging) {
+    LOCK_TRACELOG();
+
+    PRInt32* count = GetCOMPtrCount(object);
+    if(count)
+      (*count)--;
+
+    PRBool loggingThisObject = (!gObjectsToLog || LogThisObj(serialno));
+
+    if (gCOMPtrLog && loggingThisObject) {
+      fprintf(gCOMPtrLog, "\n<?> 0x%08X %d nsCOMPtrRelease %d 0x%08X\n",
+              NS_PTR_TO_INT32(object), serialno, count?(*count):-1, NS_PTR_TO_INT32(aCOMPtr));
+      WalkTheStack(gCOMPtrLog);
+    }
+
+    UNLOCK_TRACELOG();
+  }
+#endif
+  return NS_OK;
+}
+
+NS_COM void
+nsTraceRefcntImpl::Startup()
+{
+#ifdef NS_BUILD_REFCNT_LOGGING
+  SetActivityIsLegal(PR_TRUE);
+#endif
+}
+
+NS_COM void
+nsTraceRefcntImpl::Shutdown()
+{
+#ifdef NS_BUILD_REFCNT_LOGGING
+
+  if (gBloatView) {
+    PL_HashTableDestroy(gBloatView);
+    gBloatView = nsnull;
+  }
+  if (gTypesToLog) {
+    PL_HashTableDestroy(gTypesToLog);
+    gTypesToLog = nsnull;
+  }
+  if (gObjectsToLog) {
+    PL_HashTableDestroy(gObjectsToLog);
+    gObjectsToLog = nsnull;
+  }
+  if (gSerialNumbers) {
+    PL_HashTableDestroy(gSerialNumbers);
+    gSerialNumbers = nsnull;
+  }
+
+  SetActivityIsLegal(PR_FALSE);
+
+#endif
+}
+
+NS_COM void
+nsTraceRefcntImpl::SetActivityIsLegal(PRBool aLegal)
+{
+#ifdef NS_BUILD_REFCNT_LOGGING
+  gActivityIsLegal = aLegal;
+#endif
+}
+
+
+NS_METHOD
+nsTraceRefcntImpl::Create(nsISupports* outer, const nsIID& aIID, void* *aInstancePtr)
+{
+  *aInstancePtr = nsnull;
+  nsITraceRefcnt* tracer = new nsTraceRefcntImpl();
+  if (!tracer)
+    return NS_ERROR_OUT_OF_MEMORY;
+  
+  nsresult rv = tracer->QueryInterface(aIID, aInstancePtr);
+  if (NS_FAILED(rv)) {
+    delete tracer;
+  }
+  
+  return rv;
+}