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gecko-dev/xpcom/base/nsTraceRefcntImpl.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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 Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#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(__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)
#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"
#if defined(NS_MT_SUPPORTED)
#include "prlock.h"
static PRLock* gTraceLock;
#define LOCK_TRACELOG() PR_Lock(gTraceLock)
#define UNLOCK_TRACELOG() PR_Unlock(gTraceLock)
#else /* ! NT_MT_SUPPORTED */
#define LOCK_TRACELOG()
#define UNLOCK_TRACELOG()
#endif /* ! NS_MT_SUPPORTED */
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;
#define XPCOM_REFCNT_TRACK_BLOAT 0x1
#define XPCOM_REFCNT_LOG_ALL 0x2
#define XPCOM_REFCNT_LOG_SOME 0x4
#define XPCOM_REFCNT_LOG_TO_LEAKY 0x8
// Should only use this on NS_LOSING_ARCHITECTURE...
#define XPCOM_REFCNT_LOG_CALLS 0x10
#define XPCOM_REFCNT_LOG_NEW 0x20
////////////////////////////////////////////////////////////////////////////////
struct GatherArgs {
nsTraceRefcntStatFunc func;
void* closure;
};
class BloatEntry {
public:
BloatEntry(const char* className, PRUint32 classSize)
: mClassName(className), mClassSize(classSize) {
Clear(&mNewStats);
Clear(&mAllStats);
mTotalLeaked = 0;
}
~BloatEntry() {}
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, nsTraceRefcnt::ALL_STATS);
}
static PRIntn PR_CALLBACK DestroyEntry(PLHashEntry *he, PRIntn i, void *arg) {
BloatEntry* entry = (BloatEntry*)he->value;
if (entry) {
delete entry;
}
return HT_ENUMERATE_REMOVE | HT_ENUMERATE_NEXT;
}
static PRIntn PR_CALLBACK GatherEntry(PLHashEntry *he, PRIntn i, void *arg) {
BloatEntry* entry = (BloatEntry*)he->value;
GatherArgs* ga = (GatherArgs*) arg;
if (arg && entry && ga->func) {
PRBool stop = (*ga->func)(entry->mClassName, (PRUint32)entry->mClassSize,
&entry->mNewStats, &entry->mAllStats,
ga->closure);
if (stop) {
return HT_ENUMERATE_STOP;
}
}
return HT_ENUMERATE_NEXT;
}
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, nsTraceRefcnt::StatisticsType type) {
nsTraceRefcntStats* stats = (type == nsTraceRefcnt::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:
const 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
RecreateBloatView()
{
gBloatView = PL_NewHashTable(256,
PL_HashString,
PL_CompareStrings,
PL_CompareValues,
NULL, 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)
{
fprintf((FILE*) aClosure, "%d\n", PRInt32(aHashEntry->value));
return HT_ENUMERATE_NEXT;
}
#endif /* NS_BUILD_REFCNT_LOGGING */
nsresult
nsTraceRefcnt::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);
printf("nsTraceRefcnt::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
nsTraceRefcnt::ResetStatistics()
{
#ifdef NS_BUILD_REFCNT_LOGGING
LOCK_TRACELOG();
if (gBloatView) {
PL_HashTableEnumerateEntries(gBloatView, BloatEntry::DestroyEntry, 0);
PL_HashTableDestroy(gBloatView);
gBloatView = nsnull;
}
UNLOCK_TRACELOG();
#endif
}
void
nsTraceRefcnt::GatherStatistics(nsTraceRefcntStatFunc aFunc,
void* aClosure)
{
#ifdef NS_BUILD_REFCNT_LOGGING
LOCK_TRACELOG();
if (gBloatView) {
GatherArgs ga;
ga.func = aFunc;
ga.closure = aClosure;
PL_HashTableEnumerateEntries(gBloatView, BloatEntry::GatherEntry,
(void*) &ga);
}
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(aPtr), aPtr);
if (hep && *hep) {
return PRInt32((*hep)->value);
}
else if (aCreate) {
PL_HashTableRawAdd(gSerialNumbers, hep, PLHashNumber(aPtr), aPtr, (void*)(++gNextSerialNumber));
return gNextSerialNumber;
}
else {
return 0;
}
}
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*)(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(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 (NS_WARN_IF_FALSE(gBloatView, "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");
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,
NULL, NULL);
if (NS_WARN_IF_FALSE(gTypesToLog, "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,
NULL, NULL);
}
const char* objects = getenv("XPCOM_MEM_LOG_OBJECTS");
if (objects) {
gObjectsToLog = PL_NewHashTable(256,
HashNumber,
PL_CompareValues,
PL_CompareValues,
NULL, NULL);
if (NS_WARN_IF_FALSE(gObjectsToLog, "out of memory")) {
fprintf(stdout, "### XPCOM_MEM_LOG_OBJECTS defined -- unable to log specific objects\n");
}
else if (! (gRefcntsLog || gAllocLog)) {
fprintf(stdout, "### XPCOM_MEM_LOG_OBJECTS defined -- but neither XPCOM_MEM_REFCNT_LOG nor XPCOM_MEM_ALLOC_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 serialno = 0;
while (*cp) {
serialno *= 10;
serialno += *cp - '0';
++cp;
}
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) {
gLogging = PR_TRUE;
}
#if defined(NS_MT_SUPPORTED)
gTraceLock = PR_NewLock();
#endif /* NS_MT_SUPPORTED */
}
#endif
#if defined(_WIN32) && defined(_M_IX86) // WIN32 x86 stack walking code
#include "imagehlp.h"
#include <stdio.h>
// Define these as static pointers so that we can load the DLL on the
// fly (and not introduce a link-time dependency on it). Tip o' the
// hat to Matt Pietrick for this idea. See:
//
// http://msdn.microsoft.com/library/periodic/period97/F1/D3/S245C6.htm
//
typedef BOOL (__stdcall *SYMINITIALIZEPROC)(HANDLE, LPSTR, BOOL);
static SYMINITIALIZEPROC _SymInitialize;
typedef BOOL (__stdcall *SYMCLEANUPPROC)(HANDLE);
static SYMCLEANUPPROC _SymCleanup;
typedef BOOL (__stdcall *STACKWALKPROC)(DWORD,
HANDLE,
HANDLE,
LPSTACKFRAME,
LPVOID,
PREAD_PROCESS_MEMORY_ROUTINE,
PFUNCTION_TABLE_ACCESS_ROUTINE,
PGET_MODULE_BASE_ROUTINE,
PTRANSLATE_ADDRESS_ROUTINE);
static STACKWALKPROC _StackWalk;
typedef LPVOID (__stdcall *SYMFUNCTIONTABLEACCESSPROC)(HANDLE, DWORD);
static SYMFUNCTIONTABLEACCESSPROC _SymFunctionTableAccess;
typedef DWORD (__stdcall *SYMGETMODULEBASEPROC)(HANDLE, DWORD);
static SYMGETMODULEBASEPROC _SymGetModuleBase;
typedef BOOL (__stdcall *SYMGETSYMFROMADDRPROC)(HANDLE, DWORD, PDWORD, PIMAGEHLP_SYMBOL);
static SYMGETSYMFROMADDRPROC _SymGetSymFromAddr;
typedef DWORD ( __stdcall *SYMLOADMODULE)(HANDLE, HANDLE, PSTR, PSTR, DWORD, DWORD);
static SYMLOADMODULE _SymLoadModule;
static PRBool
EnsureImageHlpInitialized()
{
static PRBool gInitialized = PR_FALSE;
if (! gInitialized) {
HMODULE module = ::LoadLibrary("IMAGEHLP.DLL");
if (!module) return PR_FALSE;
_SymInitialize = (SYMINITIALIZEPROC) ::GetProcAddress(module, "SymInitialize");
if (!_SymInitialize) return PR_FALSE;
_SymCleanup = (SYMCLEANUPPROC)GetProcAddress(module, "SymCleanup");
if (!_SymCleanup) return PR_FALSE;
_StackWalk = (STACKWALKPROC)GetProcAddress(module, "StackWalk");
if (!_StackWalk) return PR_FALSE;
_SymFunctionTableAccess = (SYMFUNCTIONTABLEACCESSPROC) GetProcAddress(module, "SymFunctionTableAccess");
if (!_SymFunctionTableAccess) return PR_FALSE;
_SymGetModuleBase = (SYMGETMODULEBASEPROC)GetProcAddress(module, "SymGetModuleBase");
if (!_SymGetModuleBase) return PR_FALSE;
_SymGetSymFromAddr = (SYMGETSYMFROMADDRPROC)GetProcAddress(module, "SymGetSymFromAddr");
if (!_SymGetSymFromAddr) return PR_FALSE;
_SymLoadModule = (SYMLOADMODULE)GetProcAddress(module, "SymLoadModule");
if (!_SymLoadModule) return PR_FALSE;
gInitialized = PR_TRUE;
}
return gInitialized;
}
static PRBool
EnsureSymInitialized()
{
static PRBool gInitialized = PR_FALSE;
if (! gInitialized) {
if (! EnsureImageHlpInitialized())
return PR_FALSE;
gInitialized = _SymInitialize(GetCurrentProcess(), 0, TRUE);
}
return gInitialized;
}
/**
* Walk the stack, translating PC's found into strings and recording the
* chain in aBuffer. For this to work properly, the dll's must be rebased
* so that the address in the file agrees with the address in memory.
* Otherwise StackWalk will return FALSE when it hits a frame in a dll's
* whose in memory address doesn't match it's in-file address.
*
* Fortunately, there is a handy dandy routine in IMAGEHLP.DLL that does
* the rebasing and accordingly I've made a tool to use it to rebase the
* DLL's in one fell swoop (see xpcom/tools/windows/rebasedlls.cpp).
*/
void
nsTraceRefcnt::WalkTheStack(FILE* aStream)
{
HANDLE myProcess = ::GetCurrentProcess();
HANDLE myThread = ::GetCurrentThread();
BOOL ok;
ok = EnsureSymInitialized();
if (! ok)
return;
// Get the context information for this thread. That way we will
// know where our sp, fp, pc, etc. are and can fill in the
// STACKFRAME with the initial values.
CONTEXT context;
context.ContextFlags = CONTEXT_FULL;
ok = GetThreadContext(myThread, &context);
if (! ok)
return;
// Setup initial stack frame to walk from
STACKFRAME frame;
memset(&frame, 0, sizeof(frame));
frame.AddrPC.Offset = context.Eip;
frame.AddrPC.Mode = AddrModeFlat;
frame.AddrStack.Offset = context.Esp;
frame.AddrStack.Mode = AddrModeFlat;
frame.AddrFrame.Offset = context.Ebp;
frame.AddrFrame.Mode = AddrModeFlat;
// Now walk the stack and map the pc's to symbol names
int skip = 2;
while (1) {
ok = _StackWalk(IMAGE_FILE_MACHINE_I386,
myProcess,
myThread,
&frame,
&context,
0, // read process memory routine
_SymFunctionTableAccess, // function table access routine
_SymGetModuleBase, // module base routine
0); // translate address routine
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(aStream, "### ERROR: WalkStack: %s", lpMsgBuf);
fflush(aStream);
LocalFree( lpMsgBuf );
}
if (!ok || frame.AddrPC.Offset == 0)
break;
if (skip-- > 0)
continue;
char buf[sizeof(IMAGEHLP_SYMBOL) + 512];
PIMAGEHLP_SYMBOL symbol = (PIMAGEHLP_SYMBOL) buf;
symbol->SizeOfStruct = sizeof(buf);
symbol->MaxNameLength = 512;
DWORD displacement;
ok = _SymGetSymFromAddr(myProcess,
frame.AddrPC.Offset,
&displacement,
symbol);
if (ok) {
fprintf(aStream, "%s+0x%08X\n", symbol->Name, displacement);
}
else {
fprintf(aStream, "0x%08X\n", frame.AddrPC.Offset);
}
}
}
#elif defined(linux) && defined(__GLIBC__) && (defined(__i386) || defined(PPC)) // i386 or PPC Linux stackwalking code
void
nsTraceRefcnt::WalkTheStack(FILE* aStream)
{
jmp_buf jb;
setjmp(jb);
// Stack walking code courtesy Kipp's "leaky".
#if defined(__i386)
u_long* bp = (u_long*) (jb[0].__jmpbuf[JB_BP]);
#elif defined(PPC)
u_long* bp = (u_long*) (jb[0].__jmpbuf[JB_GPR1]);
#endif
int skip = 2;
for (;;) {
u_long* nextbp = (u_long*) *bp++;
u_long pc = *bp;
if ((pc < 0x08000000) || (pc > 0x7fffffff) || (nextbp < bp)) {
break;
}
if (--skip <= 0) {
Dl_info info;
int ok = dladdr((void*) pc, &info);
if (ok < 0)
break;
const char * symbol = info.dli_sname;
int len = strlen(symbol);
if (! len)
break; // XXX Lazy. We could look at the filename or something.
char demangled[4096] = "\0";
DemangleSymbol(symbol,demangled,sizeof(demangled));
if (strlen(demangled)) {
symbol = demangled;
len = strlen(symbol);
}
PRUint32 off = (char*)pc - (char*)info.dli_saddr;
fprintf(aStream, "%s+0x%08X\n", symbol, off);
}
bp = nextbp;
}
}
#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];
long nameLength = (tb->nameLength > --size ? size : tb->nameLength);
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
nsTraceRefcnt::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
nsTraceRefcnt::WalkTheStack(FILE* aStream)
{
fprintf(aStream, "write me, dammit!\n");
}
#endif
//----------------------------------------------------------------------
// This thing is exported by libiberty.a (-liberty)
// Yes, this is a gcc only hack
#if defined(MOZ_DEMANGLE_SYMBOLS)
extern "C" char * cplus_demangle(const char *,int);
#include <stdlib.h> // for free()
#endif // MOZ_DEMANGLE_SYMBOLS
#ifdef __linux__
NS_COM void
nsTraceRefcnt::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 = cplus_demangle(aSymbol,3);
if (demangled)
{
strncpy(aBuffer,demangled,aBufLen);
free(demangled);
}
#endif // MOZ_DEMANGLE_SYMBOLS
}
#else // __linux__
NS_COM void
nsTraceRefcnt::DemangleSymbol(const char * aSymbol,
char * aBuffer,
int aBufLen)
{
NS_ASSERTION(nsnull != aSymbol,"null symbol");
NS_ASSERTION(nsnull != aBuffer,"null buffer");
// lose
aBuffer[0] = '\0';
}
#endif // __linux__
//----------------------------------------------------------------------
NS_COM void
nsTraceRefcnt::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 = nsCRT::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
}
//----------------------------------------------------------------------
/*
For consistency, and ease of munging the output, the following record format will be used:
<TypeName> 0xADDRESS Verb [optional data]
*/
NS_COM void
nsTraceRefcnt::LogAddRef(void* aPtr,
nsrefcnt aRefCnt,
const char* aClazz,
PRUint32 classSize)
{
#ifdef NS_BUILD_REFCNT_LOGGING
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:
#ifndef NS_LOSING_ARCHITECTURE
// (If we're on a losing architecture, don't do this because we'll be
// using LogNewXPCOM instead to get file and line numbers.)
PRBool loggingThisType = (!gTypesToLog || LogThisType(aClazz));
PRInt32 serialno = 0;
if (gSerialNumbers && loggingThisType) {
serialno = GetSerialNumber(aPtr, aRefCnt == 1);
}
PRBool loggingThisObject = (!gObjectsToLog || LogThisObj(serialno));
if (aRefCnt == 1 && gAllocLog && loggingThisType && loggingThisObject) {
fprintf(gAllocLog, "\n<%s> 0x%08X %d Create\n",
aClazz, PRInt32(aPtr), serialno);
WalkTheStack(gAllocLog);
}
// (If we're on a losing architecture, don't do this because we'll be
// using LogAddRefCall instead to get file and line numbers.)
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, PRInt32(aPtr), serialno, aRefCnt);
WalkTheStack(gRefcntsLog);
fflush(gRefcntsLog);
}
}
#endif
UNLOCK_TRACELOG();
}
#endif
}
NS_COM void
nsTraceRefcnt::LogRelease(void* aPtr,
nsrefcnt aRefCnt,
const char* aClazz)
{
#ifdef NS_BUILD_REFCNT_LOGGING
if (!gInitialized)
InitTraceLog();
if (gLogging) {
LOCK_TRACELOG();
if (gBloatLog) {
BloatEntry* entry = GetBloatEntry(aClazz, 0);
if (entry) {
entry->Release(aRefCnt);
}
}
#ifndef NS_LOSING_ARCHITECTURE
// (If we're on a losing architecture, don't do this because we'll be
// using LogReleaseCall instead to get file and line numbers.)
PRBool loggingThisType = (!gTypesToLog || LogThisType(aClazz));
PRInt32 serialno = 0;
if (gSerialNumbers && loggingThisType) {
serialno = GetSerialNumber(aPtr, PR_FALSE);
}
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, PRInt32(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 we're on a losing architecture, don't do this because we'll be
// using LogDeleteXPCOM instead to get file and line numbers.)
if (aRefCnt == 0 && gAllocLog && loggingThisType && loggingThisObject) {
fprintf(gAllocLog,
"\n<%s> 0x%08X %d Destroy\n",
aClazz, PRInt32(aPtr), serialno);
WalkTheStack(gAllocLog);
}
if (aRefCnt == 0 && gSerialNumbers && loggingThisType) {
RecycleSerialNumberPtr(aPtr);
}
#endif
UNLOCK_TRACELOG();
}
#endif
}
NS_COM nsrefcnt
nsTraceRefcnt::LogAddRefCall(void* aPtr,
nsrefcnt aNewRefcnt,
const char* aFile,
int aLine)
{
#ifdef NS_BUILD_REFCNT_LOGGING
#ifdef NS_LOSING_ARCHITECTURE
if (!gInitialized)
InitTraceLog();
if (gRefcntsLog) {
LOCK_TRACELOG();
fprintf(gRefcntsLog, "\n<Call> 0x%08X AddRef %d=>%d in %s (line %d)\n",
aPtr, aNewRefcnt-1, aNewRefcnt, aFile, aLine);
WalkTheStack(gRefcntsLog);
UNLOCK_TRACELOG();
}
#endif
#endif
return aNewRefcnt;
}
NS_COM nsrefcnt
nsTraceRefcnt::LogReleaseCall(void* aPtr,
nsrefcnt aNewRefcnt,
const char* aFile,
int aLine)
{
#ifdef NS_BUILD_REFCNT_LOGGING
#ifdef NS_LOSING_ARCHITECTURE
if (!gInitialized)
InitTraceLog();
if (gRefcntsLog) {
LOCK_TRACELOG();
fprintf(gRefcntsLog, "\n<Call> 0x%08X Release %d=>%d in %s (line %d)\n",
aPtr, aNewRefcnt+1, aNewRefcnt, aFile, aLine);
WalkTheStack(gRefcntsLog);
UNLOCK_TRACELOG();
}
#endif
#endif
return aNewRefcnt;
}
NS_COM void
nsTraceRefcnt::LogNewXPCOM(void* aPtr,
const char* aType,
PRUint32 aInstanceSize,
const char* aFile,
int aLine)
{
#ifdef NS_BUILD_REFCNT_LOGGING
#ifdef NS_LOSING_ARCHITECTURE
if (!gInitialized)
InitTraceLog();
if (gAllocLog) {
LOCK_TRACELOG();
fprintf(gAllocLog, "\n<%s> 0x%08X NewXPCOM in %s (line %d)\n",
aType, aPtr, aFile, aLine);
WalkTheStack(gAllocLog);
UNLOCK_TRACELOG();
}
#endif
#endif
}
NS_COM void
nsTraceRefcnt::LogDeleteXPCOM(void* aPtr,
const char* aFile,
int aLine)
{
#ifdef NS_BUILD_REFCNT_LOGGING
#ifdef NS_LOSING_ARCHITECTURE
if (!gInitialized)
InitTraceLog();
if (gAllocLog) {
LOCK_TRACELOG();
fprintf(gAllocLog, "\n<%s> 0x%08X Destroy in %s (line %d)\n",
"?", aPtr, aFile, aLine);
WalkTheStack(gAllocLog);
UNLOCK_TRACELOG();
}
#endif
#endif
}
NS_COM void
nsTraceRefcnt::LogCtor(void* aPtr,
const char* aType,
PRUint32 aInstanceSize)
{
#ifdef NS_BUILD_REFCNT_LOGGING
if (!gInitialized)
InitTraceLog();
if (gLogging) {
LOCK_TRACELOG();
if (gBloatLog) {
BloatEntry* entry = GetBloatEntry(aType, aInstanceSize);
if (entry) {
entry->Ctor();
}
}
#ifndef NS_LOSING_ARCHITECTURE
PRBool loggingThisType = (!gTypesToLog || LogThisType(aType));
PRInt32 serialno = 0;
if (gSerialNumbers && loggingThisType) {
serialno = GetSerialNumber(aPtr, PR_TRUE);
}
// (If we're on a losing architecture, don't do this because we'll be
// using LogNewXPCOM instead to get file and line numbers.)
PRBool loggingThisObject = (!gObjectsToLog || LogThisObj(serialno));
if (gAllocLog && loggingThisType && loggingThisObject) {
fprintf(gAllocLog, "\n<%s> 0x%08X %d Ctor (%d)\n",
aType, PRInt32(aPtr), serialno, aInstanceSize);
WalkTheStack(gAllocLog);
}
#endif
UNLOCK_TRACELOG();
}
#endif
}
NS_COM void
nsTraceRefcnt::LogDtor(void* aPtr, const char* aType,
PRUint32 aInstanceSize)
{
#ifdef NS_BUILD_REFCNT_LOGGING
if (!gInitialized)
InitTraceLog();
if (gLogging) {
LOCK_TRACELOG();
if (gBloatLog) {
BloatEntry* entry = GetBloatEntry(aType, aInstanceSize);
if (entry) {
entry->Dtor();
}
}
#ifndef NS_LOSING_ARCHITECTURE
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, PRInt32(aPtr), serialno, aInstanceSize);
WalkTheStack(gAllocLog);
}
#endif
UNLOCK_TRACELOG();
}
#endif
}
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