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gecko-dev/xpcom/base/nsTraceRefcnt.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsTraceRefcnt.h"
#include "mozilla/IntegerPrintfMacros.h"
#include "mozilla/StaticPtr.h"
#include "nsXPCOMPrivate.h"
#include "nscore.h"
#include "nsISupports.h"
#include "nsTArray.h"
#include "nsTHashtable.h"
#include "prenv.h"
#include "plstr.h"
#include "prlink.h"
#include "nsCRT.h"
#include <math.h>
#include "nsHashKeys.h"
#include "nsStackWalkPrivate.h"
#include "nsStackWalk.h"
#include "nsString.h"
#include "nsThreadUtils.h"
#include "CodeAddressService.h"
#include "nsXULAppAPI.h"
#ifdef XP_WIN
#include <process.h>
#define getpid _getpid
#else
#include <unistd.h>
#endif
#ifdef NS_TRACE_MALLOC
#include "nsTraceMalloc.h"
#endif
#include "mozilla/BlockingResourceBase.h"
#include "mozilla/PoisonIOInterposer.h"
#ifdef HAVE_DLOPEN
#include <dlfcn.h>
#endif
////////////////////////////////////////////////////////////////////////////////
void
NS_MeanAndStdDev(double aNumberOfValues,
double aSumOfValues, double aSumOfSquaredValues,
double* aMeanResult, double* aStdDevResult)
{
double mean = 0.0, var = 0.0, stdDev = 0.0;
if (aNumberOfValues > 0.0 && aSumOfValues >= 0) {
mean = aSumOfValues / aNumberOfValues;
double temp =
(aNumberOfValues * aSumOfSquaredValues) - (aSumOfValues * aSumOfValues);
if (temp < 0.0 || aNumberOfValues <= 1) {
var = 0.0;
} else {
var = temp / (aNumberOfValues * (aNumberOfValues - 1));
}
// for some reason, Windows says sqrt(0.0) is "-1.#J" (?!) so do this:
stdDev = var != 0.0 ? sqrt(var) : 0.0;
}
*aMeanResult = mean;
*aStdDevResult = stdDev;
}
////////////////////////////////////////////////////////////////////////////////
#define NS_IMPL_REFCNT_LOGGING
#ifdef NS_IMPL_REFCNT_LOGGING
#include "plhash.h"
#include "prmem.h"
#include "prlock.h"
// TraceRefcnt has to use bare PRLock instead of mozilla::Mutex
// because TraceRefcnt can be used very early in startup.
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 intptr_t gNextSerialNumber;
static bool gLogging;
static bool gLogLeaksOnly;
#define BAD_TLS_INDEX ((unsigned)-1)
// if gActivityTLS == BAD_TLS_INDEX, then we're
// unitialized... otherwise this points to a NSPR TLS thread index
// indicating whether addref activity is legal. If the PTR_TO_INT32 is 0 then
// activity is ok, otherwise not!
static unsigned gActivityTLS = BAD_TLS_INDEX;
static bool gInitialized;
static nsrefcnt gInitCount;
static FILE* gBloatLog = nullptr;
static FILE* gRefcntsLog = nullptr;
static FILE* gAllocLog = nullptr;
static FILE* gLeakyLog = nullptr;
static FILE* gCOMPtrLog = nullptr;
struct serialNumberRecord
{
intptr_t serialNumber;
int32_t refCount;
int32_t COMPtrCount;
};
struct nsTraceRefcntStats
{
uint64_t mAddRefs;
uint64_t mReleases;
uint64_t mCreates;
uint64_t mDestroys;
double mRefsOutstandingTotal;
double mRefsOutstandingSquared;
double mObjsOutstandingTotal;
double mObjsOutstandingSquared;
};
#ifdef DEBUG
static const char kStaticCtorDtorWarning[] =
"XPCOM objects created/destroyed from static ctor/dtor";
static void
AssertActivityIsLegal()
{
if (gActivityTLS == BAD_TLS_INDEX ||
NS_PTR_TO_INT32(PR_GetThreadPrivate(gActivityTLS)) != 0) {
if (PR_GetEnv("MOZ_FATAL_STATIC_XPCOM_CTORS_DTORS")) {
NS_RUNTIMEABORT(kStaticCtorDtorWarning);
} else {
NS_WARNING(kStaticCtorDtorWarning);
}
}
}
# define ASSERT_ACTIVITY_IS_LEGAL \
PR_BEGIN_MACRO \
AssertActivityIsLegal(); \
PR_END_MACRO
#else
# define ASSERT_ACTIVITY_IS_LEGAL PR_BEGIN_MACRO PR_END_MACRO
#endif // DEBUG
// 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*
DefaultAllocTable(void* aPool, size_t aSize)
{
return PR_MALLOC(aSize);
}
static void
DefaultFreeTable(void* aPool, void* aItem)
{
PR_Free(aItem);
}
static PLHashEntry*
DefaultAllocEntry(void* aPool, const void* aKey)
{
return PR_NEW(PLHashEntry);
}
static void
SerialNumberFreeEntry(void* aPool, PLHashEntry* aHashEntry, unsigned aFlag)
{
if (aFlag == HT_FREE_ENTRY) {
PR_Free(reinterpret_cast<serialNumberRecord*>(aHashEntry->value));
PR_Free(aHashEntry);
}
}
static void
TypesToLogFreeEntry(void* aPool, PLHashEntry* aHashEntry, unsigned aFlag)
{
if (aFlag == HT_FREE_ENTRY) {
free(const_cast<char*>(reinterpret_cast<const char*>(aHashEntry->key)));
PR_Free(aHashEntry);
}
}
static const PLHashAllocOps serialNumberHashAllocOps = {
DefaultAllocTable, DefaultFreeTable,
DefaultAllocEntry, SerialNumberFreeEntry
};
static const PLHashAllocOps typesToLogHashAllocOps = {
DefaultAllocTable, DefaultFreeTable,
DefaultAllocEntry, TypesToLogFreeEntry
};
////////////////////////////////////////////////////////////////////////////////
#ifdef MOZ_STACKWALKING
class CodeAddressServiceStringTable MOZ_FINAL
{
public:
CodeAddressServiceStringTable() : mSet(32) {}
const char* Intern(const char* aString)
{
nsCharPtrHashKey* e = mSet.PutEntry(aString);
return e->GetKey();
}
size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
{
return mSet.SizeOfExcludingThis(aMallocSizeOf);
}
private:
typedef nsTHashtable<nsCharPtrHashKey> StringSet;
StringSet mSet;
};
struct CodeAddressServiceStringAlloc MOZ_FINAL
{
static char* copy(const char* aStr) { return strdup(aStr); }
static void free(char* aPtr) { ::free(aPtr); }
};
// WalkTheStack does not hold any locks needed by NS_DescribeCodeAddress, so
// this class does not need to do anything.
struct CodeAddressServiceLock MOZ_FINAL
{
static void Unlock() {}
static void Lock() {}
static bool IsLocked() { return true; }
};
typedef mozilla::CodeAddressService<CodeAddressServiceStringTable,
CodeAddressServiceStringAlloc,
CodeAddressServiceLock> WalkTheStackCodeAddressService;
mozilla::StaticAutoPtr<WalkTheStackCodeAddressService> gCodeAddressService;
#endif // MOZ_STACKWALKING
////////////////////////////////////////////////////////////////////////////////
class BloatEntry
{
public:
BloatEntry(const char* aClassName, uint32_t aClassSize)
: mClassSize(aClassSize)
{
mClassName = PL_strdup(aClassName);
Clear(&mNewStats);
Clear(&mAllStats);
mTotalLeaked = 0;
}
~BloatEntry()
{
PL_strfree(mClassName);
}
uint32_t GetClassSize()
{
return (uint32_t)mClassSize;
}
const char* GetClassName()
{
return mClassName;
}
static void Clear(nsTraceRefcntStats* aStats)
{
aStats->mAddRefs = 0;
aStats->mReleases = 0;
aStats->mCreates = 0;
aStats->mDestroys = 0;
aStats->mRefsOutstandingTotal = 0;
aStats->mRefsOutstandingSquared = 0;
aStats->mObjsOutstandingTotal = 0;
aStats->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 aRefcnt)
{
mNewStats.mAddRefs++;
if (aRefcnt == 1) {
Ctor();
}
AccountRefs();
}
void Release(nsrefcnt aRefcnt)
{
mNewStats.mReleases++;
if (aRefcnt == 0) {
Dtor();
}
AccountRefs();
}
void Ctor()
{
mNewStats.mCreates++;
AccountObjs();
}
void Dtor()
{
mNewStats.mDestroys++;
AccountObjs();
}
void AccountRefs()
{
uint64_t cnt = (mNewStats.mAddRefs - mNewStats.mReleases);
mNewStats.mRefsOutstandingTotal += cnt;
mNewStats.mRefsOutstandingSquared += cnt * cnt;
}
void AccountObjs()
{
uint64_t cnt = (mNewStats.mCreates - mNewStats.mDestroys);
mNewStats.mObjsOutstandingTotal += cnt;
mNewStats.mObjsOutstandingSquared += cnt * cnt;
}
static int DumpEntry(PLHashEntry* aHashEntry, int aIndex, void* aArg)
{
BloatEntry* entry = (BloatEntry*)aHashEntry->value;
if (entry) {
entry->Accumulate();
static_cast<nsTArray<BloatEntry*>*>(aArg)->AppendElement(entry);
}
return HT_ENUMERATE_NEXT;
}
static int TotalEntries(PLHashEntry* aHashEntry, int aIndex, void* aArg)
{
BloatEntry* entry = (BloatEntry*)aHashEntry->value;
if (entry && nsCRT::strcmp(entry->mClassName, "TOTAL") != 0) {
entry->Total((BloatEntry*)aArg);
}
return HT_ENUMERATE_NEXT;
}
void Total(BloatEntry* aTotal)
{
aTotal->mAllStats.mAddRefs += mNewStats.mAddRefs + mAllStats.mAddRefs;
aTotal->mAllStats.mReleases += mNewStats.mReleases + mAllStats.mReleases;
aTotal->mAllStats.mCreates += mNewStats.mCreates + mAllStats.mCreates;
aTotal->mAllStats.mDestroys += mNewStats.mDestroys + mAllStats.mDestroys;
aTotal->mAllStats.mRefsOutstandingTotal +=
mNewStats.mRefsOutstandingTotal + mAllStats.mRefsOutstandingTotal;
aTotal->mAllStats.mRefsOutstandingSquared +=
mNewStats.mRefsOutstandingSquared + mAllStats.mRefsOutstandingSquared;
aTotal->mAllStats.mObjsOutstandingTotal +=
mNewStats.mObjsOutstandingTotal + mAllStats.mObjsOutstandingTotal;
aTotal->mAllStats.mObjsOutstandingSquared +=
mNewStats.mObjsOutstandingSquared + mAllStats.mObjsOutstandingSquared;
uint64_t count = (mNewStats.mCreates + mAllStats.mCreates);
aTotal->mClassSize += mClassSize * count; // adjust for average in DumpTotal
aTotal->mTotalLeaked += (uint64_t)(mClassSize *
((mNewStats.mCreates + mAllStats.mCreates)
- (mNewStats.mDestroys + mAllStats.mDestroys)));
}
void DumpTotal(FILE* aOut)
{
mClassSize /= mAllStats.mCreates;
Dump(-1, aOut, nsTraceRefcnt::ALL_STATS);
}
static bool HaveLeaks(nsTraceRefcntStats* aStats)
{
return ((aStats->mAddRefs != aStats->mReleases) ||
(aStats->mCreates != aStats->mDestroys));
}
bool PrintDumpHeader(FILE* aOut, const char* aMsg,
nsTraceRefcnt::StatisticsType aType)
{
fprintf(aOut, "\n== BloatView: %s, %s process %d\n", aMsg,
XRE_ChildProcessTypeToString(XRE_GetProcessType()), getpid());
nsTraceRefcntStats& stats =
(aType == nsTraceRefcnt::NEW_STATS) ? mNewStats : mAllStats;
if (gLogLeaksOnly && !HaveLeaks(&stats)) {
return false;
}
fprintf(aOut,
"\n" \
" |<----------------Class--------------->|<-----Bytes------>|<----------------Objects---------------->|<--------------References-------------->|\n" \
" Per-Inst Leaked Total Rem Mean StdDev Total Rem Mean StdDev\n");
this->DumpTotal(aOut);
return true;
}
void Dump(int aIndex, FILE* aOut, nsTraceRefcnt::StatisticsType aType)
{
nsTraceRefcntStats* stats =
(aType == nsTraceRefcnt::NEW_STATS) ? &mNewStats : &mAllStats;
if (gLogLeaksOnly && !HaveLeaks(stats)) {
return;
}
double meanRefs;
double stddevRefs;
NS_MeanAndStdDev(stats->mAddRefs + stats->mReleases,
stats->mRefsOutstandingTotal,
stats->mRefsOutstandingSquared,
&meanRefs, &stddevRefs);
double meanObjs;
double 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(aOut, "%4d %-40.40s %8d %8" PRIu64 " %8" PRIu64 " %8" PRIu64 " (%8.2f +/- %8.2f) %8" PRIu64 " %8" PRIu64 " (%8.2f +/- %8.2f)\n",
aIndex + 1, mClassName,
(int32_t)mClassSize,
(nsCRT::strcmp(mClassName, "TOTAL"))
? (uint64_t)((stats->mCreates - stats->mDestroys) * mClassSize)
: mTotalLeaked,
stats->mCreates,
(stats->mCreates - stats->mDestroys),
meanObjs,
stddevObjs,
stats->mAddRefs,
(stats->mAddRefs - stats->mReleases),
meanRefs,
stddevRefs);
}
}
protected:
char* mClassName;
double mClassSize; // this is stored as a double because of the way we compute the avg class size for total bloat
uint64_t mTotalLeaked; // used only for TOTAL entry
nsTraceRefcntStats mNewStats;
nsTraceRefcntStats mAllStats;
};
static void
BloatViewFreeEntry(void* aPool, PLHashEntry* aHashEntry, unsigned aFlag)
{
if (aFlag == HT_FREE_ENTRY) {
BloatEntry* entry = reinterpret_cast<BloatEntry*>(aHashEntry->value);
delete entry;
PR_Free(aHashEntry);
}
}
const static PLHashAllocOps bloatViewHashAllocOps = {
DefaultAllocTable, DefaultFreeTable,
DefaultAllocEntry, BloatViewFreeEntry
};
static void
RecreateBloatView()
{
gBloatView = PL_NewHashTable(256,
PL_HashString,
PL_CompareStrings,
PL_CompareValues,
&bloatViewHashAllocOps, nullptr);
}
static BloatEntry*
GetBloatEntry(const char* aTypeName, uint32_t aInstanceSize)
{
if (!gBloatView) {
RecreateBloatView();
}
BloatEntry* entry = nullptr;
if (gBloatView) {
entry = (BloatEntry*)PL_HashTableLookup(gBloatView, aTypeName);
if (!entry && aInstanceSize > 0) {
entry = new BloatEntry(aTypeName, aInstanceSize);
PLHashEntry* e = PL_HashTableAdd(gBloatView, aTypeName, entry);
if (!e) {
delete entry;
entry = nullptr;
}
} else {
NS_ASSERTION(aInstanceSize == 0 ||
entry->GetClassSize() == aInstanceSize,
"bad size recorded");
}
}
return entry;
}
static int
DumpSerialNumbers(PLHashEntry* aHashEntry, int aIndex, void* aClosure)
{
serialNumberRecord* record =
reinterpret_cast<serialNumberRecord*>(aHashEntry->value);
#ifdef HAVE_CPP_DYNAMIC_CAST_TO_VOID_PTR
fprintf((FILE*)aClosure, "%" PRIdPTR
" @%p (%d references; %d from COMPtrs)\n",
record->serialNumber,
NS_INT32_TO_PTR(aHashEntry->key),
record->refCount,
record->COMPtrCount);
#else
fprintf((FILE*)aClosure, "%" PRIdPTR
" @%p (%d references)\n",
record->serialNumber,
NS_INT32_TO_PTR(aHashEntry->key),
record->refCount);
#endif
return HT_ENUMERATE_NEXT;
}
template<>
class nsDefaultComparator<BloatEntry*, BloatEntry*>
{
public:
bool Equals(BloatEntry* const& aEntry1, BloatEntry* const& aEntry2) const
{
return PL_strcmp(aEntry1->GetClassName(), aEntry2->GetClassName()) == 0;
}
bool LessThan(BloatEntry* const& aEntry1, BloatEntry* const& aEntry2) const
{
return PL_strcmp(aEntry1->GetClassName(), aEntry2->GetClassName()) < 0;
}
};
#endif /* NS_IMPL_REFCNT_LOGGING */
nsresult
nsTraceRefcnt::DumpStatistics(StatisticsType aType, FILE* aOut)
{
#ifdef NS_IMPL_REFCNT_LOGGING
if (!gBloatLog || !gBloatView) {
return NS_ERROR_FAILURE;
}
if (!aOut) {
aOut = gBloatLog;
}
LOCK_TRACELOG();
bool wasLogging = gLogging;
gLogging = false; // turn off logging for this method
BloatEntry total("TOTAL", 0);
PL_HashTableEnumerateEntries(gBloatView, BloatEntry::TotalEntries, &total);
const char* msg;
if (aType == 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";
}
}
const bool leaked = total.PrintDumpHeader(aOut, msg, aType);
nsTArray<BloatEntry*> entries;
PL_HashTableEnumerateEntries(gBloatView, BloatEntry::DumpEntry, &entries);
const uint32_t count = entries.Length();
if (!gLogLeaksOnly || leaked) {
// Sort the entries alphabetically by classname.
entries.Sort();
for (uint32_t i = 0; i < count; ++i) {
BloatEntry* entry = entries[i];
entry->Dump(i, aOut, aType);
}
fprintf(aOut, "\n");
}
fprintf(aOut, "nsTraceRefcnt::DumpStatistics: %d entries\n", count);
if (gSerialNumbers) {
fprintf(aOut, "\nSerial Numbers of Leaked Objects:\n");
PL_HashTableEnumerateEntries(gSerialNumbers, DumpSerialNumbers, aOut);
}
gLogging = wasLogging;
UNLOCK_TRACELOG();
#endif
return NS_OK;
}
void
nsTraceRefcnt::ResetStatistics()
{
#ifdef NS_IMPL_REFCNT_LOGGING
LOCK_TRACELOG();
if (gBloatView) {
PL_HashTableDestroy(gBloatView);
gBloatView = nullptr;
}
UNLOCK_TRACELOG();
#endif
}
#ifdef NS_IMPL_REFCNT_LOGGING
static bool
LogThisType(const char* aTypeName)
{
void* he = PL_HashTableLookup(gTypesToLog, aTypeName);
return he != nullptr;
}
static intptr_t
GetSerialNumber(void* aPtr, bool aCreate)
{
PLHashEntry** hep = PL_HashTableRawLookup(gSerialNumbers,
PLHashNumber(NS_PTR_TO_INT32(aPtr)),
aPtr);
if (hep && *hep) {
return 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, reinterpret_cast<void*>(record));
return gNextSerialNumber;
}
return 0;
}
static int32_t*
GetRefCount(void* aPtr)
{
PLHashEntry** hep = PL_HashTableRawLookup(gSerialNumbers,
PLHashNumber(NS_PTR_TO_INT32(aPtr)),
aPtr);
if (hep && *hep) {
return &((reinterpret_cast<serialNumberRecord*>((*hep)->value))->refCount);
} else {
return nullptr;
}
}
#if defined(NS_IMPL_REFCNT_LOGGING) && defined(HAVE_CPP_DYNAMIC_CAST_TO_VOID_PTR)
static int32_t*
GetCOMPtrCount(void* aPtr)
{
PLHashEntry** hep = PL_HashTableRawLookup(gSerialNumbers,
PLHashNumber(NS_PTR_TO_INT32(aPtr)),
aPtr);
if (hep && *hep) {
return &((reinterpret_cast<serialNumberRecord*>((*hep)->value))->COMPtrCount);
}
return nullptr;
}
#endif
static void
RecycleSerialNumberPtr(void* aPtr)
{
PL_HashTableRemove(gSerialNumbers, aPtr);
}
static bool
LogThisObj(intptr_t aSerialNumber)
{
return (bool)PL_HashTableLookup(gObjectsToLog, (const void*)aSerialNumber);
}
#ifdef XP_WIN
#define FOPEN_NO_INHERIT "N"
#else
#define FOPEN_NO_INHERIT
#endif
static bool
InitLog(const char* aEnvVar, const char* aMsg, FILE** aResult)
{
const char* value = getenv(aEnvVar);
if (value) {
if (nsCRT::strcmp(value, "1") == 0) {
*aResult = stdout;
fprintf(stdout, "### %s defined -- logging %s to stdout\n",
aEnvVar, aMsg);
return true;
} else if (nsCRT::strcmp(value, "2") == 0) {
*aResult = stderr;
fprintf(stdout, "### %s defined -- logging %s to stderr\n",
aEnvVar, aMsg);
return true;
} else {
FILE* stream;
nsAutoCString fname(value);
if (XRE_GetProcessType() != GeckoProcessType_Default) {
bool hasLogExtension =
fname.RFind(".log", true, -1, 4) == kNotFound ? false : true;
if (hasLogExtension) {
fname.Cut(fname.Length() - 4, 4);
}
fname.Append('_');
fname.Append((char*)XRE_ChildProcessTypeToString(XRE_GetProcessType()));
fname.AppendLiteral("_pid");
fname.AppendInt((uint32_t)getpid());
if (hasLogExtension) {
fname.AppendLiteral(".log");
}
}
stream = ::fopen(fname.get(), "w" FOPEN_NO_INHERIT);
if (stream) {
MozillaRegisterDebugFD(fileno(stream));
*aResult = stream;
fprintf(stdout, "### %s defined -- logging %s to %s\n",
aEnvVar, aMsg, fname.get());
} else {
fprintf(stdout, "### %s defined -- unable to log %s to %s\n",
aEnvVar, aMsg, fname.get());
}
return stream != nullptr;
}
}
return false;
}
static PLHashNumber
HashNumber(const void* aKey)
{
return PLHashNumber(NS_PTR_TO_INT32(aKey));
}
static void
maybeUnregisterAndCloseFile(FILE*& aFile)
{
if (!aFile) {
return;
}
MozillaUnRegisterDebugFILE(aFile);
fclose(aFile);
aFile = nullptr;
}
static void
InitTraceLog()
{
if (gInitialized) {
return;
}
gInitialized = true;
bool 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");
maybeUnregisterAndCloseFile(gBloatLog);
gLogLeaksOnly = false;
}
}
InitLog("XPCOM_MEM_REFCNT_LOG", "refcounts", &gRefcntsLog);
InitLog("XPCOM_MEM_ALLOC_LOG", "new/delete", &gAllocLog);
const char* classes = getenv("XPCOM_MEM_LOG_CLASSES");
#ifdef HAVE_CPP_DYNAMIC_CAST_TO_VOID_PTR
if (classes) {
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, nullptr);
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, 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, nullptr);
}
const char* objects = getenv("XPCOM_MEM_LOG_OBJECTS");
if (objects) {
gObjectsToLog = PL_NewHashTable(256,
HashNumber,
PL_CompareValues,
PL_CompareValues,
nullptr, nullptr);
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';
}
intptr_t top = 0;
intptr_t bottom = 0;
while (*cp) {
if (*cp == '-') {
bottom = top;
top = 0;
++cp;
}
top *= 10;
top += *cp - '0';
++cp;
}
if (!bottom) {
bottom = top;
}
for (intptr_t serialno = bottom; serialno <= top; serialno++) {
PL_HashTableAdd(gObjectsToLog, (const void*)serialno, (void*)1);
fprintf(stdout, "%" PRIdPTR " ", serialno);
}
if (!cm) {
break;
}
*cm = ',';
cp = cm + 1;
}
fprintf(stdout, "\n");
}
}
if (gBloatLog || gRefcntsLog || gAllocLog || gLeakyLog || gCOMPtrLog) {
gLogging = true;
}
gTraceLock = PR_NewLock();
}
#endif
extern "C" {
#ifdef MOZ_STACKWALKING
static void
PrintStackFrame(uint32_t aFrameNumber, void* aPC, void* aSP, void* aClosure)
{
FILE* stream = (FILE*)aClosure;
nsCodeAddressDetails details;
char buf[1024];
NS_DescribeCodeAddress(aPC, &details);
NS_FormatCodeAddressDetails(buf, sizeof(buf), aFrameNumber, aPC, &details);
fprintf(stream, "%s\n", buf);
fflush(stream);
}
static void
PrintStackFrameCached(uint32_t aFrameNumber, void* aPC, void* aSP,
void* aClosure)
{
auto stream = static_cast<FILE*>(aClosure);
static const size_t buflen = 1024;
char buf[buflen];
gCodeAddressService->GetLocation(aFrameNumber, aPC, buf, buflen);
fprintf(stream, " %s\n", buf);
fflush(stream);
}
#endif
}
void
nsTraceRefcnt::WalkTheStack(FILE* aStream)
{
#ifdef MOZ_STACKWALKING
NS_StackWalk(PrintStackFrame, /* skipFrames */ 2, /* maxFrames */ 0, aStream,
0, nullptr);
#endif
}
void
nsTraceRefcnt::WalkTheStackCached(FILE* aStream)
{
#ifdef MOZ_STACKWALKING
if (!gCodeAddressService) {
gCodeAddressService = new WalkTheStackCodeAddressService();
}
NS_StackWalk(PrintStackFrameCached, /* skipFrames */ 2, /* maxFrames */ 0,
aStream, 0, nullptr);
#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
void
nsTraceRefcnt::DemangleSymbol(const char* aSymbol,
char* aBuffer,
int aBufLen)
{
NS_ASSERTION(aSymbol, "null symbol");
NS_ASSERTION(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
}
//----------------------------------------------------------------------
EXPORT_XPCOM_API(void)
NS_LogInit()
{
NS_SetMainThread();
// FIXME: This is called multiple times, we should probably not allow that.
#ifdef MOZ_STACKWALKING
StackWalkInitCriticalAddress();
#endif
#ifdef NS_IMPL_REFCNT_LOGGING
if (++gInitCount) {
nsTraceRefcnt::SetActivityIsLegal(true);
}
#endif
#ifdef NS_TRACE_MALLOC
// XXX we don't have to worry about shutting down trace-malloc; it
// handles this itself, through an atexit() callback.
if (!NS_TraceMallocHasStarted()) {
NS_TraceMallocStartup(-1); // -1 == no logging
}
#endif
}
EXPORT_XPCOM_API(void)
NS_LogTerm()
{
mozilla::LogTerm();
}
namespace mozilla {
void
LogTerm()
{
NS_ASSERTION(gInitCount > 0,
"NS_LogTerm without matching NS_LogInit");
if (--gInitCount == 0) {
#ifdef DEBUG
/* FIXME bug 491977: This is only going to operate on the
* BlockingResourceBase which is compiled into
* libxul/libxpcom_core.so. Anyone using external linkage will
* have their own copy of BlockingResourceBase statics which will
* not be freed by this method.
*
* It sounds like what we really want is to be able to register a
* callback function to call at XPCOM shutdown. Note that with
* this solution, however, we need to guarantee that
* BlockingResourceBase::Shutdown() runs after all other shutdown
* functions.
*/
BlockingResourceBase::Shutdown();
#endif
if (gInitialized) {
nsTraceRefcnt::DumpStatistics();
nsTraceRefcnt::ResetStatistics();
}
nsTraceRefcnt::Shutdown();
#ifdef NS_IMPL_REFCNT_LOGGING
nsTraceRefcnt::SetActivityIsLegal(false);
gActivityTLS = BAD_TLS_INDEX;
#endif
}
}
} // namespace mozilla
EXPORT_XPCOM_API(void)
NS_LogAddRef(void* aPtr, nsrefcnt aRefcnt,
const char* aClass, uint32_t aClassSize)
{
#ifdef NS_IMPL_REFCNT_LOGGING
ASSERT_ACTIVITY_IS_LEGAL;
if (!gInitialized) {
InitTraceLog();
}
if (gLogging) {
LOCK_TRACELOG();
if (gBloatLog) {
BloatEntry* entry = GetBloatEntry(aClass, aClassSize);
if (entry) {
entry->AddRef(aRefcnt);
}
}
// Here's the case where MOZ_COUNT_CTOR was not used,
// yet we still want to see creation information:
bool loggingThisType = (!gTypesToLog || LogThisType(aClass));
intptr_t serialno = 0;
if (gSerialNumbers && loggingThisType) {
serialno = GetSerialNumber(aPtr, aRefcnt == 1);
NS_ASSERTION(serialno != 0,
"Serial number requested for unrecognized pointer! "
"Are you memmoving a refcounted object?");
int32_t* count = GetRefCount(aPtr);
if (count) {
(*count)++;
}
}
bool loggingThisObject = (!gObjectsToLog || LogThisObj(serialno));
if (aRefcnt == 1 && gAllocLog && loggingThisType && loggingThisObject) {
fprintf(gAllocLog, "\n<%s> 0x%08X %" PRIdPTR " Create\n",
aClass, NS_PTR_TO_INT32(aPtr), serialno);
nsTraceRefcnt::WalkTheStackCached(gAllocLog);
}
if (gRefcntsLog && loggingThisType && loggingThisObject) {
// Can't use PR_LOG(), b/c it truncates the line
fprintf(gRefcntsLog,
"\n<%s> 0x%08X %" PRIuPTR " AddRef %" PRIuPTR "\n",
aClass, NS_PTR_TO_INT32(aPtr), serialno, aRefcnt);
nsTraceRefcnt::WalkTheStackCached(gRefcntsLog);
fflush(gRefcntsLog);
}
UNLOCK_TRACELOG();
}
#endif
}
EXPORT_XPCOM_API(void)
NS_LogRelease(void* aPtr, nsrefcnt aRefcnt, const char* aClass)
{
#ifdef NS_IMPL_REFCNT_LOGGING
ASSERT_ACTIVITY_IS_LEGAL;
if (!gInitialized) {
InitTraceLog();
}
if (gLogging) {
LOCK_TRACELOG();
if (gBloatLog) {
BloatEntry* entry = GetBloatEntry(aClass, 0);
if (entry) {
entry->Release(aRefcnt);
}
}
bool loggingThisType = (!gTypesToLog || LogThisType(aClass));
intptr_t serialno = 0;
if (gSerialNumbers && loggingThisType) {
serialno = GetSerialNumber(aPtr, false);
NS_ASSERTION(serialno != 0,
"Serial number requested for unrecognized pointer! "
"Are you memmoving a refcounted object?");
int32_t* count = GetRefCount(aPtr);
if (count) {
(*count)--;
}
}
bool loggingThisObject = (!gObjectsToLog || LogThisObj(serialno));
if (gRefcntsLog && loggingThisType && loggingThisObject) {
// Can't use PR_LOG(), b/c it truncates the line
fprintf(gRefcntsLog,
"\n<%s> 0x%08X %" PRIuPTR " Release %" PRIuPTR "\n", aClass,
NS_PTR_TO_INT32(aPtr), serialno, aRefcnt);
nsTraceRefcnt::WalkTheStackCached(gRefcntsLog);
fflush(gRefcntsLog);
}
// Here's the case where MOZ_COUNT_DTOR was not used,
// yet we still want to see deletion information:
if (aRefcnt == 0 && gAllocLog && loggingThisType && loggingThisObject) {
fprintf(gAllocLog,
"\n<%s> 0x%08X %" PRIdPTR " Destroy\n",
aClass, NS_PTR_TO_INT32(aPtr), serialno);
nsTraceRefcnt::WalkTheStackCached(gAllocLog);
}
if (aRefcnt == 0 && gSerialNumbers && loggingThisType) {
RecycleSerialNumberPtr(aPtr);
}
UNLOCK_TRACELOG();
}
#endif
}
EXPORT_XPCOM_API(void)
NS_LogCtor(void* aPtr, const char* aType, uint32_t aInstanceSize)
{
#ifdef NS_IMPL_REFCNT_LOGGING
ASSERT_ACTIVITY_IS_LEGAL;
if (!gInitialized) {
InitTraceLog();
}
if (gLogging) {
LOCK_TRACELOG();
if (gBloatLog) {
BloatEntry* entry = GetBloatEntry(aType, aInstanceSize);
if (entry) {
entry->Ctor();
}
}
bool loggingThisType = (!gTypesToLog || LogThisType(aType));
intptr_t serialno = 0;
if (gSerialNumbers && loggingThisType) {
serialno = GetSerialNumber(aPtr, true);
}
bool loggingThisObject = (!gObjectsToLog || LogThisObj(serialno));
if (gAllocLog && loggingThisType && loggingThisObject) {
fprintf(gAllocLog, "\n<%s> 0x%08X %" PRIdPTR " Ctor (%d)\n",
aType, NS_PTR_TO_INT32(aPtr), serialno, aInstanceSize);
nsTraceRefcnt::WalkTheStackCached(gAllocLog);
}
UNLOCK_TRACELOG();
}
#endif
}
EXPORT_XPCOM_API(void)
NS_LogDtor(void* aPtr, const char* aType, uint32_t aInstanceSize)
{
#ifdef NS_IMPL_REFCNT_LOGGING
ASSERT_ACTIVITY_IS_LEGAL;
if (!gInitialized) {
InitTraceLog();
}
if (gLogging) {
LOCK_TRACELOG();
if (gBloatLog) {
BloatEntry* entry = GetBloatEntry(aType, aInstanceSize);
if (entry) {
entry->Dtor();
}
}
bool loggingThisType = (!gTypesToLog || LogThisType(aType));
intptr_t serialno = 0;
if (gSerialNumbers && loggingThisType) {
serialno = GetSerialNumber(aPtr, false);
RecycleSerialNumberPtr(aPtr);
}
bool 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 %" PRIdPTR " Dtor (%d)\n",
aType, NS_PTR_TO_INT32(aPtr), serialno, aInstanceSize);
nsTraceRefcnt::WalkTheStackCached(gAllocLog);
}
UNLOCK_TRACELOG();
}
#endif
}
EXPORT_XPCOM_API(void)
NS_LogCOMPtrAddRef(void* aCOMPtr, nsISupports* aObject)
{
#if defined(NS_IMPL_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;
}
intptr_t serialno = GetSerialNumber(object, false);
if (serialno == 0) {
return;
}
if (!gInitialized) {
InitTraceLog();
}
if (gLogging) {
LOCK_TRACELOG();
int32_t* count = GetCOMPtrCount(object);
if (count) {
(*count)++;
}
bool loggingThisObject = (!gObjectsToLog || LogThisObj(serialno));
if (gCOMPtrLog && loggingThisObject) {
fprintf(gCOMPtrLog, "\n<?> 0x%08X %" PRIdPTR " nsCOMPtrAddRef %d 0x%08X\n",
NS_PTR_TO_INT32(object), serialno, count ? (*count) : -1,
NS_PTR_TO_INT32(aCOMPtr));
nsTraceRefcnt::WalkTheStackCached(gCOMPtrLog);
}
UNLOCK_TRACELOG();
}
#endif
}
EXPORT_XPCOM_API(void)
NS_LogCOMPtrRelease(void* aCOMPtr, nsISupports* aObject)
{
#if defined(NS_IMPL_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;
}
intptr_t serialno = GetSerialNumber(object, false);
if (serialno == 0) {
return;
}
if (!gInitialized) {
InitTraceLog();
}
if (gLogging) {
LOCK_TRACELOG();
int32_t* count = GetCOMPtrCount(object);
if (count) {
(*count)--;
}
bool loggingThisObject = (!gObjectsToLog || LogThisObj(serialno));
if (gCOMPtrLog && loggingThisObject) {
fprintf(gCOMPtrLog, "\n<?> 0x%08X %" PRIdPTR " nsCOMPtrRelease %d 0x%08X\n",
NS_PTR_TO_INT32(object), serialno, count ? (*count) : -1,
NS_PTR_TO_INT32(aCOMPtr));
nsTraceRefcnt::WalkTheStackCached(gCOMPtrLog);
}
UNLOCK_TRACELOG();
}
#endif
}
void
nsTraceRefcnt::Shutdown()
{
#ifdef NS_IMPL_REFCNT_LOGGING
#ifdef MOZ_STACKWALKING
gCodeAddressService = nullptr;
#endif
if (gBloatView) {
PL_HashTableDestroy(gBloatView);
gBloatView = nullptr;
}
if (gTypesToLog) {
PL_HashTableDestroy(gTypesToLog);
gTypesToLog = nullptr;
}
if (gObjectsToLog) {
PL_HashTableDestroy(gObjectsToLog);
gObjectsToLog = nullptr;
}
if (gSerialNumbers) {
PL_HashTableDestroy(gSerialNumbers);
gSerialNumbers = nullptr;
}
maybeUnregisterAndCloseFile(gBloatLog);
maybeUnregisterAndCloseFile(gRefcntsLog);
maybeUnregisterAndCloseFile(gAllocLog);
maybeUnregisterAndCloseFile(gLeakyLog);
maybeUnregisterAndCloseFile(gCOMPtrLog);
#endif
}
void
nsTraceRefcnt::SetActivityIsLegal(bool aLegal)
{
#ifdef NS_IMPL_REFCNT_LOGGING
if (gActivityTLS == BAD_TLS_INDEX) {
PR_NewThreadPrivateIndex(&gActivityTLS, nullptr);
}
PR_SetThreadPrivate(gActivityTLS, NS_INT32_TO_PTR(!aLegal));
#endif
}
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