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gecko-dev/xpcom/base/nsTraceRefcnt.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 1.0 (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.
*/
#include "nsISupports.h"
#include "nsVoidArray.h"
#include "prprf.h"
#include "prlog.h"
#include "plstr.h"
#if defined(_WIN32)
#include <windows.h>
#elif defined(linux) && defined(__GLIBC__) && defined(__i386)
#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
#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 PRLogModuleInfo* gTraceRefcntLog;
static void InitTraceLog(void)
{
if (0 == gTraceRefcntLog) {
gTraceRefcntLog = PR_NewLogModule("xpcomrefcnt");
#if defined(NS_MT_SUPPORTED)
gTraceLock = PR_NewLock();
#endif /* NS_MT_SUPPORTED */
}
}
int nsIToA16(PRUint32 aNumber, char* aBuffer)
{
static char kHex[] = "0123456789abcdef";
if (aNumber == 0) {
*aBuffer = '0';
return 1;
}
char buf[8];
PRInt32 count = 0;
while (aNumber != 0) {
PRUint32 nibble = aNumber & 0xf;
buf[count++] = kHex[nibble];
aNumber >>= 4;
}
for (PRInt32 i = count - 1; i >= 0; --i)
*aBuffer++ = buf[i];
return count;
}
#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;
static PRBool
EnsureSymInitialized()
{
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;
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(char* aBuffer, int aBufLen)
{
aBuffer[0] = '\0';
aBufLen--; // leave room for nul
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 that we stuff
// append to *cp.
char* cp = aBuffer;
int skip = 2;
while (aBufLen > 0) {
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 || 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) {
int nameLen = strlen(symbol->Name);
if (nameLen + 12 > aBufLen) { // 12 == strlen("+0x12345678 ")
break;
}
char* cp2 = symbol->Name;
while (*cp2) {
if (*cp2 == ' ') *cp2 = '_'; // replace spaces with underscores
*cp++ = *cp2++;
}
aBufLen -= nameLen;
*cp++ = '+';
*cp++ = '0';
*cp++ = 'x';
PRInt32 len = nsIToA16(displacement, cp);
cp += len;
*cp++ = ' ';
aBufLen -= nameLen + len + 4;
}
else {
if (11 > aBufLen) { // 11 == strlen("0x12345678 ")
break;
}
*cp++ = '0';
*cp++ = 'x';
PRInt32 len = nsIToA16(frame.AddrPC.Offset, cp);
cp += len;
*cp++ = ' ';
aBufLen -= len + 3;
}
}
*cp = 0;
}
/* _WIN32 */
#elif defined(linux) && defined(__GLIBC__) && defined(__i386) // i386 Linux stackwalking code
void
nsTraceRefcnt::WalkTheStack(char* aBuffer, int aBufLen)
{
aBuffer[0] = '\0';
aBufLen--; // leave room for nul
char* cp = aBuffer;
jmp_buf jb;
setjmp(jb);
// Stack walking code courtesy Kipp's "leaky".
u_long* bp = (u_long*) (jb[0].__jmpbuf[JB_BP]);
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 (demangled && strlen(demangled))
{
symbol = demangled;
len = strlen(symbol);
}
if (len + 12 >= aBufLen) // 12 == strlen("+0x12345678 ")
break;
strcpy(cp, symbol);
cp += len;
*cp++ = '+';
*cp++ = '0';
*cp++ = 'x';
PRUint32 off = (char*)pc - (char*)info.dli_saddr;
PRInt32 addrStrLen = nsIToA16(off, cp);
cp += addrStrLen;
*cp++ = '\t';
aBufLen -= addrStrLen + 4;
}
bp = nextbp;
}
*cp = '\0';
}
#else // unsupported platform.
NS_COM void
nsTraceRefcnt::WalkTheStack(char* aBuffer, int aBufLen)
{
// Write me!!!
*aBuffer = '\0';
}
#endif
NS_COM void
nsTraceRefcnt::LoadLibrarySymbols(const char* aLibraryName,
void* aLibrayHandle)
{
#ifdef MOZ_TRACE_XPCOM_REFCNT
#if defined(_WIN32) && defined(_M_IX86) /* Win32 x86 only */
InitTraceLog();
if (PR_LOG_TEST(gTraceRefcntLog,PR_LOG_DEBUG)) {
HANDLE myProcess = ::GetCurrentProcess();
if (!SymInitialize(myProcess, ".;..\\lib", TRUE)) {
return;
}
BOOL b = ::SymLoadModule(myProcess,
NULL,
(char*)aLibraryName,
(char*)aLibraryName,
0,
0);
// DWORD lastError = 0;
// if (!b) lastError = ::GetLastError();
// printf("loading symbols for library %s => %s [%d]\n", aLibraryName,
// b ? "true" : "false", lastError);
}
#endif
#endif
}
NS_COM unsigned long
nsTraceRefcnt::AddRef(void* aPtr,
unsigned long aNewRefcnt,
const char* aFile,
PRIntn aLine)
{
#ifdef MOZ_TRACE_XPCOM_REFCNT
InitTraceLog();
LOCK_TRACELOG();
if (PR_LOG_TEST(gTraceRefcntLog,PR_LOG_DEBUG)) {
char sb[1000];
WalkTheStack(sb, sizeof(sb));
PR_LOG(gTraceRefcntLog, PR_LOG_DEBUG,
("AddRef: %p: %d=>%d [%s] in %s (line %d)",
aPtr, aNewRefcnt-1, aNewRefcnt, sb, aFile, aLine));
}
UNLOCK_TRACELOG();
#endif
return aNewRefcnt;
}
NS_COM unsigned long
nsTraceRefcnt::Release(void* aPtr,
unsigned long aNewRefcnt,
const char* aFile,
PRIntn aLine)
{
#ifdef MOZ_TRACE_XPCOM_REFCNT
InitTraceLog();
LOCK_TRACELOG();
if (PR_LOG_TEST(gTraceRefcntLog,PR_LOG_DEBUG)) {
char sb[1000];
WalkTheStack(sb, sizeof(sb));
PR_LOG(gTraceRefcntLog, PR_LOG_DEBUG,
("Release: %p: %d=>%d [%s] in %s (line %d)",
aPtr, aNewRefcnt+1, aNewRefcnt, sb, aFile, aLine));
}
UNLOCK_TRACELOG();
#endif
return aNewRefcnt;
}
NS_COM void
nsTraceRefcnt::Create(void* aPtr,
const char* aType,
const char* aFile,
PRIntn aLine)
{
#ifdef MOZ_TRACE_XPCOM_REFCNT
InitTraceLog();
LOCK_TRACELOG();
if (PR_LOG_TEST(gTraceRefcntLog,PR_LOG_DEBUG)) {
char sb[1000];
WalkTheStack(sb, sizeof(sb));
PR_LOG(gTraceRefcntLog, PR_LOG_DEBUG,
("Create: %p[%s]: [%s] in %s (line %d)",
aPtr, aType, sb, aFile, aLine));
}
UNLOCK_TRACELOG();
#endif
}
NS_COM void
nsTraceRefcnt::Destroy(void* aPtr,
const char* aFile,
PRIntn aLine)
{
#ifdef MOZ_TRACE_XPCOM_REFCNT
InitTraceLog();
LOCK_TRACELOG();
if (PR_LOG_TEST(gTraceRefcntLog,PR_LOG_DEBUG)) {
char sb[1000];
WalkTheStack(sb, sizeof(sb));
PR_LOG(gTraceRefcntLog, PR_LOG_DEBUG,
("Destroy: %p: [%s] in %s (line %d)",
aPtr, sb, aFile, aLine));
}
UNLOCK_TRACELOG();
#endif
}
NS_COM void
nsTraceRefcnt::LogAddRef(void* aPtr,
nsrefcnt aRefCnt,
const char* aClazz)
{
InitTraceLog();
if (PR_LOG_TEST(gTraceRefcntLog, PR_LOG_DEBUG)) {
char sb[16384];
WalkTheStack(sb, sizeof(sb));
// Can't use PR_LOG(), b/c it truncates the line
printf("%s\t%p\tAddRef\t%d\t%s\n", aClazz, aPtr, aRefCnt, sb);
}
}
NS_COM void
nsTraceRefcnt::LogRelease(void* aPtr,
nsrefcnt aRefCnt,
const char* aClazz)
{
InitTraceLog();
if (PR_LOG_TEST(gTraceRefcntLog, PR_LOG_DEBUG)) {
char sb[16384];
WalkTheStack(sb, sizeof(sb));
// Can't use PR_LOG(), b/c it truncates the line
printf("%s\t%p\tRelease\t%d\t%s\n", aClazz, aPtr, aRefCnt, sb);
}
}
// 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__
//----------------------------------------------------------------------
#ifdef DEBUG
struct CtorEntry {
const char* type;
mozCtorDtorCounter* counter;
};
nsVoidArray* nsTraceRefcnt::mCtors;
void
nsTraceRefcnt::RegisterCtor(const char* aType,
mozCtorDtorCounter* aCounterAddr)
{
if (!mCtors) {
mCtors = new nsVoidArray();
if (!mCtors) {
return;
}
}
CtorEntry* e = new CtorEntry();
if (!e) {
return;
}
e->type = aType;
e->counter = aCounterAddr;
mCtors->AppendElement(e);
}
void
nsTraceRefcnt::UnregisterCtor(const char* aType)
{
if (mCtors) {
PRInt32 i, n = mCtors->Count();
for (i = 0; i < n; i++) {
CtorEntry* e = (CtorEntry*) mCtors->ElementAt(i);
if (0 == PL_strcmp(e->type, aType)) {
delete e;
mCtors->RemoveElementAt(i);
break;
}
}
}
}
void
nsTraceRefcnt::DumpLeaks(FILE* out)
{
if (mCtors) {
PRBool haveLeaks = PR_FALSE;
PRInt32 i, n = mCtors->Count();
for (i = 0; i < n; i++) {
CtorEntry* e = (CtorEntry*) mCtors->ElementAt(i);
if (e) {
mozCtorDtorCounter* cdc = e->counter;
if (cdc) {
if (cdc->ctors != cdc->dtors) {
haveLeaks = PR_TRUE;
break;
}
}
}
}
if (haveLeaks) {
fprintf(out, "*** There are memory leaks:\n");
fprintf(out, "%-40s %-15s %s\n", "Type", "# created", "# leaked");
fprintf(out, "%-40s %-15s %s\n", "----", "---------", "--------");
for (i = 0; i < n; i++) {
CtorEntry* e = (CtorEntry*) mCtors->ElementAt(i);
if (e && e->counter) {
mozCtorDtorCounter* cdc = e->counter;
if (cdc->ctors != cdc->dtors) {
fprintf(out, "%-40s %-15d %d\n", e->type, cdc->ctors,
cdc->ctors - cdc->dtors);
}
}
}
}
}
}
void
nsTraceRefcnt::FlushCtorRegistry(void)
{
if (mCtors) {
PRInt32 i, n = mCtors->Count();
for (i = 0; i < n; i++) {
CtorEntry* e = (CtorEntry*) mCtors->ElementAt(i);
delete e;
}
delete mCtors;
}
}
#endif /* DEBUG */
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