gecko-dev/xpcom/base/nsTraceRefcnt.h

/* -*- 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.
 */
#ifndef nsTraceRefcnt_h___
#define nsTraceRefcnt_h___

#include "nsCom.h"

#include <stdio.h>

// Normaly, the implementation of NS_LOG_ADDREF and NS_LOG_RELEASE
// will use a stack crawl to determine who called Addref/Release on an
// xpcom object.  If your platform can't implement a stack crawling
// function, then define this to symbol. When the symbol is defined
// then the NS_LOG_ADDREF_CALL and NS_LOG_RELEASE_CALL will expand
// differently.
#undef NS_LOSING_ARCHITECTURE

// By default refcnt logging is not part of the build.
#undef NS_BUILD_REFCNT_LOGGING

#if (defined(DEBUG) || defined(FORCE_BUILD_REFCNT_LOGGING))
// Make refcnt logging part of the build. This doesn't mean that
// actual logging will occur (that requires a seperate enable; see
// nsTraceRefcnt.h for more information).
#define NS_BUILD_REFCNT_LOGGING 1
#endif

// If NO_BUILD_REFCNT_LOGGING is defined then disable refcnt logging
// in the build. This overrides FORCE_BUILD_REFCNT_LOGGING.
#if defined(NO_BUILD_REFCNT_LOGGING)
#undef NS_BUILD_REFCNT_LOGGING
#endif

#ifdef NS_BUILD_REFCNT_LOGGING

#define NS_LOG_ADDREF(_p, _rc, _type, _size) \
  nsTraceRefcnt::LogAddRef((_p), (_rc), (_type), (PRUint32) (_size))

#define NS_LOG_RELEASE(_p, _rc, _type) \
  nsTraceRefcnt::LogRelease((_p), (_rc), (_type))

#ifdef NS_LOSING_ARCHITECTURE

#define NS_LOG_ADDREF_CALL(_p,_rc,_file,_line) \
  nsTraceRefcnt::LogAddRefCall((_p), (_rc), (_file), (_line))

#define NS_LOG_RELEASE_CALL(_p,_rc,_file,_line) \
  nsTraceRefcnt::LogReleaseCall((_p), (_rc), (_file), (_line))

#define NS_LOG_NEW_XPCOM(_p,_type,_size,_file,_line) \
  nsTraceRefcnt::LogNewXPCOM((_p),(_type),(PRUint32)(_size),(_file),(_line))

#define NS_LOG_DELETE_XPCOM(_p,_file,_line) \
  nsTraceRefcnt::LogDeleteXPCOM((_p),(_file),(_line))

#else

#define NS_LOG_ADDREF_CALL(_p,_rc,_file,_line) _rc
#define NS_LOG_RELEASE_CALL(_p,_rc,_file,_line) _rc

#define NS_LOG_NEW_XPCOM(_p,_type,_size,_file,_line)
#define NS_LOG_DELETE_XPCOM(_p,_file,_line)

#endif

#define MOZ_DECL_CTOR_COUNTER(_type)

#define MOZ_COUNT_CTOR(_type)                                 \
PR_BEGIN_MACRO                                                \
  nsTraceRefcnt::LogCtor((void*)this, #_type, sizeof(*this)); \
PR_END_MACRO

#define MOZ_COUNT_DTOR(_type)                                 \
PR_BEGIN_MACRO                                                \
  nsTraceRefcnt::LogDtor((void*)this, #_type, sizeof(*this)); \
PR_END_MACRO

#else /* !NS_BUILD_REFCNT_LOGGING */

#define NS_LOG_ADDREF(_p, _rc, _type, _size)
#define NS_LOG_RELEASE(_p, _rc, _type)
#define NS_LOG_NEW_XPCOM(_p,_type,_size,_file,_line)
#define NS_LOG_DELETE_XPCOM(_p,_file,_line)
#define NS_LOG_ADDREF_CALL(_p,_rc,_file,_line) _rc
#define NS_LOG_RELEASE_CALL(_p,_rc,_file,_line) _rc
#define MOZ_DECL_CTOR_COUNTER(_type)
#define MOZ_COUNT_CTOR(_type)
#define MOZ_COUNT_DTOR(_type)

#endif /* NS_BUILD_REFCNT_LOGGING */

//----------------------------------------------------------------------

class nsIOutputStream;

struct nsTraceRefcntStats {
  nsrefcnt mAddRefs;
  nsrefcnt mReleases;
  nsrefcnt mCreates;
  nsrefcnt mDestroys;
  double mRefsOutstandingTotal;
  double mRefsOutstandingVariance;
  double mObjsOutstandingTotal;
  double mObjsOutstandingVariance;
};

// Function type used by GatherStatistics. For each type that data has
// been gathered for, this function is called with the counts of the
// various operations that have been logged. The function can return
// PR_FALSE if the gathering should stop.
//
// aCurrentStats is the current value of the counters. aPrevStats is
// the previous value of the counters which is established by the
// nsTraceRefcnt::SnapshotStatistics call.
typedef PRBool (PR_CALLBACK *nsTraceRefcntStatFunc)
  (const char* aTypeName,
   PRUint32 aInstanceSize,
   nsTraceRefcntStats* aCurrentStats,
   nsTraceRefcntStats* aPrevStats,
   void *aClosure);

/**
 * Note: The implementations for these methods are no-ops in a build
 * where NS_BUILD_REFCNT_LOGGING is disabled.
 */
class nsTraceRefcnt {
public:
  static NS_COM void LogAddRef(void* aPtr,
                               nsrefcnt aNewRefCnt,
                               const char* aTypeName,
                               PRUint32 aInstanceSize);

  static NS_COM void LogRelease(void* aPtr,
                                nsrefcnt aNewRefCnt,
                                const char* aTypeName);

  static NS_COM void LogNewXPCOM(void* aPtr,
                                 const char* aTypeName,
                                 PRUint32 aInstanceSize,
                                 const char* aFile,
                                 int aLine);

  static NS_COM void LogDeleteXPCOM(void* aPtr,
                                    const char* aFile,
                                    int aLine);

  static NS_COM nsrefcnt LogAddRefCall(void* aPtr,
                                       nsrefcnt aNewRefcnt,
                                       const char* aFile,
                                       int aLine);

  static NS_COM nsrefcnt LogReleaseCall(void* aPtr,
                                        nsrefcnt aNewRefcnt,
                                        const char* aFile,
                                        int aLine);

  static NS_COM void LogCtor(void* aPtr, const char* aTypeName,
                             PRUint32 aInstanceSize);

  static NS_COM void LogDtor(void* aPtr, const char* aTypeName,
                             PRUint32 aInstanceSize);

  enum StatisticsType {
    ALL_STATS,
    NEW_STATS
  };

  static NS_COM nsresult DumpStatistics(StatisticsType type = ALL_STATS,
                                        nsIOutputStream* out = 0);
  
  static NS_COM void ResetStatistics(void);

  static NS_COM void GatherStatistics(nsTraceRefcntStatFunc aFunc,
                                      void* aClosure);

  static NS_COM void LoadLibrarySymbols(const char* aLibraryName,
                                        void* aLibrayHandle);

  static NS_COM void DemangleSymbol(const char * aSymbol, 
                                    char * aBuffer,
                                    int aBufLen);

  // XXX change this to take an nsIOutputStream
  static NS_COM void WalkTheStack(FILE* aStream);
};

#endif /* nsTraceRefcnt_h___ */