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17c46104de
deb-mbse/lib/memwatch.c
Michiel Broek 8995db5796 Revised source dependencies
2002-06-30 12:48:44 +00:00

2356 lines
67 KiB
C
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/*
** MEMWATCH.C
** Nonintrusive ANSI C memory leak / overwrite detection
** Copyright (C) 1992-99 Johan Lindh
** All rights reserved.
** Version 2.62
**
** 920810 JLI [1.00]
** 920830 JLI [1.10 double-free detection]
** 920912 JLI [1.15 mwPuts, mwGrab/Drop, mwLimit]
** 921022 JLI [1.20 ASSERT and VERIFY]
** 921105 JLI [1.30 C++ support and TRACE]
** 921116 JLI [1.40 mwSetOutFunc]
** 930215 JLI [1.50 modified ASSERT/VERIFY]
** 930327 JLI [1.51 better auto-init & PC-lint support]
** 930506 JLI [1.55 MemWatch class, improved C++ support]
** 930507 JLI [1.60 mwTest & CHECK()]
** 930809 JLI [1.65 Abort/Retry/Ignore]
** 930820 JLI [1.70 data dump when unfreed]
** 931016 JLI [1.72 modified C++ new/delete handling]
** 931108 JLI [1.77 mwSetAssertAction() & some small changes]
** 940110 JLI [1.80 no-mans-land alloc/checking]
** 940328 JLI [2.00 version 2.0 rewrite]
** Improved NML (no-mans-land) support.
** Improved performance (especially for free()ing!).
** Support for 'read-only' buffers (checksums)
** ^^ NOTE: I never did this... maybe I should?
** FBI (free'd block info) tagged before freed blocks
** Exporting of the mwCounter variable
** mwBreakOut() localizes debugger support
** Allocation statistics (global, per-module, per-line)
** Self-repair ability with relinking
** 950913 JLI [2.10 improved garbage handling]
** 951201 JLI [2.11 improved auto-free in emergencies]
** 960125 JLI [X.01 implemented auto-checking using mwAutoCheck()]
** 960514 JLI [2.12 undefining of existing macros]
** 960515 JLI [2.13 possibility to use default new() & delete()]
** 960516 JLI [2.20 suppression of file flushing on unfreed msgs]
** 960516 JLI [2.21 better support for using MEMWATCH with DLL's]
** 960710 JLI [X.02 multiple logs and mwFlushNow()]
** 960801 JLI [2.22 merged X.01 version with current]
** 960805 JLI [2.30 mwIsXXXXAddr() to avoid unneeded GP's]
** 960805 JLI [2.31 merged X.02 version with current]
** 961002 JLI [2.32 support for realloc() + fixed STDERR bug]
** 961222 JLI [2.40 added mwMark() & mwUnmark()]
** 970101 JLI [2.41 added over/underflow checking after failed ASSERT/VERIFY]
** 970113 JLI [2.42 added support for PC-Lint 7.00g]
** 970207 JLI [2.43 added support for strdup()]
** 970209 JLI [2.44 changed default filename to lowercase]
** 970405 JLI [2.45 fixed bug related with atexit() and some C++ compilers]
** 970723 JLI [2.46 added MW_ARI_NULLREAD flag]
** 970813 JLI [2.47 stabilized marker handling]
** 980317 JLI [2.48 ripped out C++ support; wasn't working good anyway]
** 980318 JLI [2.50 improved self-repair facilities & SIGSEGV support]
** 980417 JLI [2.51 more checks for invalid addresses]
** 980512 JLI [2.52 moved MW_ARI_NULLREAD to occur before aborting]
** 990112 JLI [2.53 added check for empty heap to mwIsOwned]
** 990217 JLI [2.55 improved the emergency repairs diagnostics and NML]
** 990224 JLI [2.56 changed ordering of members in structures]
** 990303 JLI [2.57 first maybe-fixit-for-hpux test]
** 990516 JLI [2.58 added 'static' to the definition of mwAutoInit]
** 990517 JLI [2.59 fixed some high-sensitivity warnings]
** 990610 JLI [2.60 fixed some more high-sensitivity warnings]
** 990715 JLI [2.61 changed TRACE/ASSERT/VERIFY macro names]
** 991001 JLI [2.62 added CHECK_BUFFER() and mwTestBuffer()]
*/
#include "../config.h"
#ifdef MEMWATCH
#define __MEMWATCH_C 1
#ifdef MW_NOCPP
#define MEMWATCH_NOCPP
#endif
#ifdef MW_STDIO
#define MEMWATCH_STDIO
#endif
/***********************************************************************
** Include files
***********************************************************************/
#include "libs.h"
#include "memwatch.h"
/***********************************************************************
** Defines & other weird stuff
***********************************************************************/
/*lint -save -e767 */
#define MW_VERSION "2.62" /* the current version number */
#define CHKVAL(mw) (0xFE0180L^(long)mw->count^(long)mw->size^(long)mw->line)
#define FLUSH() mwFlush()
#define TESTS(f,l) if(mwTestAlways) (void)mwTestNow(f,l,1)
#define PRECHK 0x01234567L
#define POSTCHK 0x76543210L
/*lint -restore */
#define MW_NML 0x0001
#ifdef _MSC_VER
#define COMMIT "c" /* Microsoft C requires the 'c' to perform as desired */
#else
#define COMMIT "" /* Normal ANSI */
#endif /* _MSC_VER */
#ifdef __cplusplus
#define CPPTEXT "++"
#else
#define CPPTEXT ""
#endif /* __cplusplus */
#ifdef MEMWATCH_STDIO
#define mwSTDERR stderr
#else
#define mwSTDERR mwLog
#endif
/***********************************************************************
** Defines to read/write 32 bit words in a portable way
** Note: Assumes that a 'long int' is 32 bits, and a 'char' is 8 bits.
***********************************************************************/
typedef unsigned char mwBYTE;
typedef unsigned long mwDWORD;
#define GETDWORD(l, cp) { \
register mwBYTE *t_cp = (mwBYTE *)(cp); \
(l) = ((mwDWORD)t_cp[0] << 24) \
| ((mwDWORD)t_cp[1] << 16) \
| ((mwDWORD)t_cp[2] << 8) \
| ((mwDWORD)t_cp[3]) \
; \
}
#define PUTDWORD(l, cp) { \
register mwDWORD t_l = (mwDWORD)(l); \
register mwBYTE *t_cp = (mwBYTE *)(cp); \
*t_cp++ = (mwBYTE)(t_l >> 24); \
*t_cp++ = (mwBYTE)(t_l >> 16); \
*t_cp++ = (mwBYTE)(t_l >> 8); \
*t_cp = (mwBYTE)t_l; \
}
/***********************************************************************
** Typedefs & structures
***********************************************************************/
/* main data holding area, precedes actual allocation */
typedef struct mwData_ mwData;
struct mwData_ {
mwData* prev; /* previous allocation in chain */
mwData* next; /* next allocation in chain */
const char* file; /* file name where allocated */
long count; /* action count */
long check; /* integrity check value */
#if 0
long crc; /* data crc value */
#endif
size_t size; /* size of allocation */
int line; /* line number where allocated */
unsigned flag; /* flag word */
};
/* statistics structure */
typedef struct mwStat_ mwStat;
struct mwStat_ {
mwStat* next; /* next statistic buffer */
const char* file;
long total; /* total bytes allocated */
long num; /* total number of allocations */
long max; /* max allocated at one time */
long curr; /* current allocations */
int line;
};
/* grabbing structure, 1K in size */
typedef struct mwGrabData_ mwGrabData;
struct mwGrabData_ {
mwGrabData* next;
int type;
char blob[ 1024 - sizeof(mwGrabData*) - sizeof(int) ];
};
typedef struct mwMarker_ mwMarker;
struct mwMarker_ {
void *host;
char *text;
mwMarker *next;
int level;
};
/***********************************************************************
** Static variables
***********************************************************************/
static int mwInited = 0;
static int mwInfoWritten = 0;
static int mwUseAtexit = 0;
static FILE* mwLog = NULL;
static int mwFlushing = 0;
static int mwStatLevel = MW_STAT_DEFAULT;
static int mwNML = MW_NML_DEFAULT;
static int mwFBI = 0;
static long mwAllocLimit = 0L;
static int mwUseLimit = 0;
static long mwNumCurAlloc = 0L;
static mwData* mwHead = NULL;
static mwData* mwTail = NULL;
static void (*mwOutFunction)(int) = NULL;
static int (*mwAriFunction)(const char*) = NULL;
static int mwAriAction = MW_ARI_ABORT;
static char mwPrintBuf[MW_TRACE_BUFFER+8];
static unsigned long mwCounter = 0L;
static long mwErrors = 0L;
static int mwTestFlags = 0;
static int mwTestAlways = 0;
static FILE* mwLogB1 = NULL;
static int mwFlushingB1 = 0;
static mwStat* mwStatList = NULL;
static long mwStatTotAlloc = 0L;
static long mwStatMaxAlloc = 0L;
static long mwStatNumAlloc = 0L;
static long mwStatCurAlloc = 0L;
static long mwNmlNumAlloc = 0L;
static long mwNmlCurAlloc = 0L;
static mwGrabData* mwGrabList = NULL;
static long mwGrabSize = 0L;
static void * mwLastFree[MW_FREE_LIST];
static const char *mwLFfile[MW_FREE_LIST];
static int mwLFline[MW_FREE_LIST];
static int mwLFcur = 0;
static mwMarker* mwFirstMark = NULL;
static FILE* mwLogB2 = NULL;
static int mwFlushingB2 = 0;
/***********************************************************************
** Static function declarations
***********************************************************************/
static void mwAutoInit( void );
static FILE* mwLogR( void );
static void mwLogW( FILE* );
static int mwFlushR( void );
static void mwFlushW( int );
static void mwFlush( void );
static void mwIncErr( void );
static void mwUnlink( mwData*, const char* file, int line );
static int mwRelink( mwData*, const char* file, int line );
static int mwIsHeapOK( mwData *mw );
static int mwIsOwned( mwData* mw, const char* file, int line );
static int mwTestBuf( mwData* mw, const char* file, int line );
static void mwDefaultOutFunc( int );
static void mwWrite( const char* format, ... );
static void mwLogFile( const char* name );
static size_t mwFreeUp( size_t, int );
static const void *mwTestMem( const void *, unsigned, int );
static int mwStrCmpI( const char *s1, const char *s2 );
static int mwTestNow( const char *file, int line, int always_invoked );
static void mwDropAll( void );
static const char *mwGrabType( int type );
static unsigned mwGrab_( unsigned kb, int type, int silent );
static unsigned mwDrop_( unsigned kb, int type, int silent );
static int mwARI( const char* text );
static void mwStatReport( void );
static mwStat* mwStatGet( const char*, int, int );
static void mwStatAlloc( size_t, const char*, int );
static void mwStatFree( size_t, const char*, int );
/***********************************************************************
** System functions
***********************************************************************/
void mwInit( void ) {
time_t tid;
if( mwInited++ > 0 ) return;
/* start a log if none is running */
if( mwLogR() == NULL ) mwLogFile( "/opt/mbse/log/memwatch.log" );
if( mwLogR() == NULL ) {
int i;
char buf[32];
/* oops, could not open it! */
/* probably because it's already open */
/* so we try some other names */
for( i=1; i<100; i++ ) {
sprintf( buf, "memwat%02d.log", i );
mwLogFile( buf );
if( mwLogR() != NULL ) break;
}
}
/* initialize the statistics */
mwStatList = NULL;
mwStatTotAlloc = 0L;
mwStatCurAlloc = 0L;
mwStatMaxAlloc = 0L;
mwStatNumAlloc = 0L;
mwNmlCurAlloc = 0L;
mwNmlNumAlloc = 0L;
/* write informational header if needed */
if( !mwInfoWritten ) {
mwInfoWritten = 1;
(void) time( &tid );
mwWrite(
"\n============="
" MEMWATCH " MW_VERSION " Copyright (C) 1992-1999 Johan Lindh "
"=============\n");
mwWrite( "\nStarted at %s\n", ctime( &tid ) );
/**************************************************************** Generic */
#ifdef mwNew
mwWrite( "C++ new/delete tracking enabled\n" );
#endif /* mwNew */
#ifdef __STDC__
mwWrite( "Compiled as standard ANSI C\n" );
#endif /* __STDC__ */
/**************************************************************** Generic */
/************************************************************ Microsoft C */
#ifdef _MSC_VER
mwWrite( "Compiled using Microsoft C" CPPTEXT
" %d.%02d\n", _MSC_VER / 100, _MSC_VER % 100 );
#endif /* _MSC_VER */
/************************************************************ Microsoft C */
/************************************************************** Borland C */
#ifdef __BORLANDC__
mwWrite( "Compiled using Borland C"
#ifdef __cplusplus
"++ %d.%01d\n", __BCPLUSPLUS__/0x100, (__BCPLUSPLUS__%0x100)/0x10 );
#else
" %d.%01d\n", __BORLANDC__/0x100, (__BORLANDC__%0x100)/0x10 );
#endif /* __cplusplus */
#endif /* __BORLANDC__ */
/************************************************************** Borland C */
/************************************************************** Watcom C */
#ifdef __WATCOMC__
mwWrite( "Compiled using Watcom C %d.%02d ",
__WATCOMC__/100, __WATCOMC__%100 );
#ifdef __FLAT__
mwWrite( "(32-bit flat model)" );
#endif /* __FLAT__ */
mwWrite( "\n" );
#endif /* __WATCOMC__ */
/************************************************************** Watcom C */
mwWrite( "\n" );
FLUSH();
}
if( mwUseAtexit ) (void) atexit( mwAbort );
return;
}
void mwAbort( void ) {
mwData *mw;
mwMarker *mrk;
char *data;
time_t tid;
int c, i, j;
int errors;
long chk;
tid = time( NULL );
mwWrite( "\nStopped at %s\n", ctime( &tid) );
if( !mwInited )
mwWrite( "internal: mwAbort(): MEMWATCH not initialized!\n" );
/* release the grab list */
mwDropAll();
/* report mwMarked items */
while( mwFirstMark ) {
mrk = mwFirstMark->next;
mwWrite( "mark: %p: %s\n", mwFirstMark->host, mwFirstMark->text );
free( mwFirstMark->text );
free( mwFirstMark );
mwFirstMark = mrk;
mwErrors ++;
}
/* release all still allocated memory */
errors = 0;
while( mwHead != NULL && errors < 3 ) {
if( !mwIsOwned(mwHead, __FILE__, __LINE__ ) ) {
if( errors < 3 )
{
errors ++;
mwWrite( "internal: NML/unfreed scan restarting\n" );
FLUSH();
mwHead = mwHead;
continue;
}
mwWrite( "internal: NML/unfreed scan aborted, heap too damaged\n" );
FLUSH();
break;
}
mwFlushW(0);
if( !(mwHead->flag & MW_NML) ) {
mwErrors++;
data = ((char*)(mwHead+1));
mwWrite( "unfreed: <%ld> %s(%d), %ld bytes at %p ",
mwHead->count, mwHead->file, mwHead->line, (long)mwHead->size, data+sizeof(long) );
GETDWORD( chk, data );
if( chk != PRECHK ) {
mwWrite( "[underflowed] ");
FLUSH();
}
GETDWORD( chk, (data+sizeof(long)+mwHead->size) );
if( chk != POSTCHK ) {
mwWrite( "[overflowed] ");
FLUSH();
}
mwWrite( " \t{" );
j = 16; if( mwHead->size < 16 ) j = (int) mwHead->size;
for( i=0;i<16;i++ ) {
if( i<j ) mwWrite( "%02X ",
(unsigned char) *(data+sizeof(long)+i) );
else mwWrite( ".. " );
}
for( i=0;i<j;i++ ) {
c = *(data+sizeof(long)+i);
if( c < 32 || c > 126 ) c = '.';
mwWrite( "%c", c );
}
mwWrite( "}\n" );
mw = mwHead;
mwUnlink( mw, __FILE__, __LINE__ );
free( mw );
}
else {
data = ((char*)(mwHead+1)) + sizeof(long);
if( mwTestMem( data, mwHead->size, MW_VAL_NML ) ) {
mwErrors++;
mwWrite( "wild pointer: <%ld> NoMansLand %p alloc'd at %s(%d)\n",
mwHead->count, data + sizeof(long), mwHead->file, mwHead->line );
FLUSH();
}
mwNmlNumAlloc --;
mwNmlCurAlloc -= mwHead->size;
mw = mwHead;
mwUnlink( mw, __FILE__, __LINE__ );
free( mw );
}
}
if( mwNmlNumAlloc ) mwWrite("internal: NoMansLand block counter %ld, not zero\n", mwNmlNumAlloc );
if( mwNmlCurAlloc ) mwWrite("internal: NoMansLand byte counter %ld, not zero\n", mwNmlCurAlloc );
/* report statistics */
mwStatReport();
FLUSH();
mwInited = 0;
mwHead = mwTail = NULL;
if( mwErrors )
fprintf(mwSTDERR,"MEMWATCH detected %ld anomalies\n",mwErrors);
mwLogFile( NULL );
mwErrors = 0;
}
void mwTerm( void ) {
if( mwInited == 1 )
{
mwAbort();
return;
}
if( !mwInited )
mwWrite("internal: mwTerm(): MEMWATCH has not been started!\n");
else
mwInited --;
}
void mwStatistics( int level )
{
mwAutoInit();
if( level<0 ) level=0;
if( mwStatLevel != level )
{
mwWrite( "statistics: now collecting on a %s basis\n",
level<1?"global":(level<2?"module":"line") );
mwStatLevel = level;
}
}
void mwAutoCheck( int onoff ) {
mwAutoInit();
mwTestAlways = onoff;
if( onoff ) mwTestFlags = MW_TEST_ALL;
}
void mwSetOutFunc( void (*func)(int) ) {
mwAutoInit();
mwOutFunction = func;
}
int mwTest( const char *file, int line, int items ) {
mwAutoInit();
mwTestFlags = items;
return mwTestNow( file, line, 0 );
}
/*
** Returns zero if there are no errors.
** Returns nonzero if there are errors.
*/
int mwTestBuffer( const char *file, int line, void *p ) {
mwData* mw;
mwAutoInit();
/* do the quick ownership test */
mw = (mwData*) ( ((char*)p)-sizeof(long)-sizeof(mwData) );
if( mwIsOwned( mw, file, line ) ) {
return mwTestBuf( mw, file, line );
}
return 1;
}
void mwBreakOut( const char* cause ) {
fprintf(mwSTDERR, "breakout: %s\n", cause);
mwWrite("breakout: %s\n", cause );
return;
}
/*
** 981217 JLI: is it possible that ->next is not always set?
*/
void * mwMark( void *p, const char *desc, const char *file, unsigned line ) {
mwMarker *mrk;
unsigned n, isnew;
char *buf;
int tot, oflow = 0;
char wherebuf[128];
mwAutoInit();
TESTS(NULL,0);
if( desc == NULL ) desc = "unknown";
if( file == NULL ) file = "unknown";
tot = sprintf( wherebuf, "%.48s called from %s(%d)", desc, file, line );
if( tot >= (int)sizeof(wherebuf) ) { wherebuf[sizeof(wherebuf)-1] = 0; oflow = 1; }
if( p == NULL ) {
mwWrite("mark: %s(%d), no mark for NULL:'%s' may be set\n", file, line, desc );
return p;
}
if( mwFirstMark != NULL && !mwIsReadAddr( mwFirstMark, sizeof( mwMarker ) ) )
{
mwWrite("mark: %s(%d), mwFirstMark (%p) is trashed, can't mark for %s\n",
file, line, mwFirstMark, desc );
return p;
}
for( mrk=mwFirstMark; mrk; mrk=mrk->next )
{
if( mrk->next != NULL && !mwIsReadAddr( mrk->next, sizeof( mwMarker ) ) )
{
mwWrite("mark: %s(%d), mark(%p)->next(%p) is trashed, can't mark for %s\n",
file, line, mrk, mrk->next, desc );
return p;
}
if( mrk->host == p ) break;
}
if( mrk == NULL ) {
isnew = 1;
mrk = (mwMarker*) malloc( sizeof( mwMarker ) );
if( mrk == NULL ) {
mwWrite("mark: %s(%d), no mark for %p:'%s', out of memory\n", file, line, p, desc );
return p;
}
mrk->next = NULL;
n = 0;
}
else {
isnew = 0;
n = strlen( mrk->text );
}
n += strlen( wherebuf );
buf = (char*) malloc( n+3 );
if( buf == NULL ) {
if( isnew ) free( mrk );
mwWrite("mark: %s(%d), no mark for %p:'%s', out of memory\n", file, line, p, desc );
return p;
}
if( isnew ) {
memcpy( buf, wherebuf, n+1 );
mrk->next = mwFirstMark;
mrk->host = p;
mrk->text = buf;
mrk->level = 1;
mwFirstMark = mrk;
}
else {
strcpy( buf, mrk->text );
strcat( buf, ", " );
strcat( buf, wherebuf );
free( mrk->text );
mrk->text = buf;
mrk->level ++;
}
if( oflow ) {
mwIncErr();
mwTrace( " [WARNING: OUTPUT BUFFER OVERFLOW - SYSTEM UNSTABLE]\n" );
}
return p;
}
void* mwUnmark( void *p, const char *file, unsigned line ) {
mwMarker *mrk, *prv;
mrk = mwFirstMark;
prv = NULL;
while( mrk ) {
if( mrk->host == p ) {
if( mrk->level < 2 ) {
if( prv ) prv->next = mrk->next;
else mwFirstMark = mrk->next;
free( mrk->text );
free( mrk );
return p;
}
mrk->level --;
return p;
}
prv = mrk;
mrk = mrk->next;
}
mwWrite("mark: %s(%d), no mark found for %p\n", file, line, p );
return p;
}
/***********************************************************************
** Safe memory checkers
**
** Using ifdefs, implement the operating-system specific mechanism
** of identifying a piece of memory as legal to access with read
** and write priviliges. Default: return nonzero for non-NULL pointers.
***********************************************************************/
static char mwDummy( char c )
{
return c;
}
#ifndef MW_SAFEADDR
#ifdef WIN32
#define MW_SAFEADDR
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
int mwIsReadAddr( const void *p, unsigned len )
{
if( p == NULL ) return 0;
if( IsBadReadPtr(p,len) ) return 0;
return 1;
}
int mwIsSafeAddr( void *p, unsigned len )
{
/* NOTE: For some reason, under Win95 the IsBad... */
/* can return false for invalid pointers. */
if( p == NULL ) return 0;
if( IsBadReadPtr(p,len) || IsBadWritePtr(p,len) ) return 0;
return 1;
}
#endif /* WIN32 */
#endif /* MW_SAFEADDR */
#ifndef MW_SAFEADDR
#ifdef SIGSEGV
#define MW_SAFEADDR
typedef void (*mwSignalHandlerPtr)( int );
mwSignalHandlerPtr mwOldSIGSEGV = (mwSignalHandlerPtr) 0;
jmp_buf mwSIGSEGVjump;
static void mwSIGSEGV( int n );
static void mwSIGSEGV( int n )
{
longjmp( mwSIGSEGVjump, 1 );
}
int mwIsReadAddr( const void *p, unsigned len )
{
const char *ptr;
if( p == NULL ) return 0;
if( !len ) return 1;
/* set up to catch the SIGSEGV signal */
mwOldSIGSEGV = signal( SIGSEGV, mwSIGSEGV );
if( setjmp( mwSIGSEGVjump ) )
{
signal( SIGSEGV, mwOldSIGSEGV );
return 0;
}
/* read all the bytes in the range */
ptr = (const char *)p;
ptr += len;
/* the reason for this rather strange construct is that */
/* we want to keep the number of used parameters and locals */
/* to a minimum. if we use len for a counter gcc will complain */
/* it may get clobbered by longjmp() at high warning levels. */
/* it's a harmless warning, but this way we don't have to see it. */
do
{
ptr --;
if( *ptr == 0x7C ) (void) mwDummy( (char)0 );
} while( ptr != p );
/* remove the handler */
signal( SIGSEGV, mwOldSIGSEGV );
return 1;
}
int mwIsSafeAddr( void *p, unsigned len )
{
char *ptr;
if( p == NULL ) return 0;
if( !len ) return 1;
/* set up to catch the SIGSEGV signal */
mwOldSIGSEGV = signal( SIGSEGV, mwSIGSEGV );
if( setjmp( mwSIGSEGVjump ) )
{
signal( SIGSEGV, mwOldSIGSEGV );
return 0;
}
/* read and write-back all the bytes in the range */
ptr = (char *)p;
ptr += len;
/* the reason for this rather strange construct is that */
/* we want to keep the number of used parameters and locals */
/* to a minimum. if we use len for a counter gcc will complain */
/* it may get clobbered by longjmp() at high warning levels. */
/* it's a harmless warning, but this way we don't have to see it. */
do
{
ptr --;
*ptr = mwDummy( *ptr );
} while( ptr != p );
/* remove the handler */
signal( SIGSEGV, mwOldSIGSEGV );
return 1;
}
#endif /* SIGSEGV */
#endif /* MW_SAFEADDR */
#ifndef MW_SAFEADDR
int mwIsReadAddr( const void *p, unsigned len )
{
if( p == NULL ) return 0;
if( len == 0 ) return 1;
return 1;
}
int mwIsSafeAddr( void *p, unsigned len )
{
if( p == NULL ) return 0;
if( len == 0 ) return 1;
return 1;
}
#endif
/***********************************************************************
** Abort/Retry/Ignore handlers
***********************************************************************/
static int mwARI( const char *estr ) {
char inbuf[81];
int c;
fprintf(mwSTDERR, "\n%s\nMEMWATCH: Abort, Retry or Ignore? ", estr);
(void) fgets(inbuf,sizeof(inbuf),stdin);
for( c=0; inbuf[c] && inbuf[c] <= ' '; c++ ) ;
c = inbuf[c];
if( c == 'R' || c == 'r' ) {
mwBreakOut( estr );
return MW_ARI_RETRY;
}
if( c == 'I' || c == 'i' ) return MW_ARI_IGNORE;
return MW_ARI_ABORT;
}
/* standard ARI handler (exported) */
int mwAriHandler( const char *estr ) {
mwAutoInit();
return mwARI( estr );
}
/* used to set the ARI function */
void mwSetAriFunc( int (*func)(const char *) ) {
mwAutoInit();
mwAriFunction = func;
}
/***********************************************************************
** Allocation handlers
***********************************************************************/
void* mwMalloc( size_t size, const char* file, int line) {
size_t needed;
mwData *mw;
char *ptr;
void *p;
mwAutoInit();
TESTS(file,line);
mwCounter ++;
needed = sizeof(mwData) + sizeof(long) + sizeof(long) + size;
/* if this allocation would violate the limit, fail it */
if( mwUseLimit && ((long)size + mwStatCurAlloc > mwAllocLimit) ) {
mwWrite( "limit fail: <%ld> %s(%d), %ld wanted %ld available\n",
mwCounter, file, line, (long)size, mwAllocLimit - mwStatCurAlloc );
mwIncErr();
FLUSH();
return NULL;
}
mw = (mwData*) malloc( needed );
if( mw == NULL ) {
if( mwFreeUp(needed,0) >= needed ) {
mw = (mwData*) malloc(needed);
if( mw == NULL ) {
mwWrite( "internal: mwFreeUp(%u) reported success, but malloc() fails\n", needed );
mwIncErr();
FLUSH();
}
}
if( mw == NULL ) {
mwWrite( "fail: <%ld> %s(%d), %ld wanted %ld allocated\n",
mwCounter, file, line, (long)size, mwStatCurAlloc );
mwIncErr();
FLUSH();
return NULL;
}
}
mw->count = mwCounter;
mw->prev = NULL;
mw->next = mwHead;
mw->file = file;
mw->size = size;
mw->line = line;
mw->flag = 0;
mw->check = CHKVAL(mw);
if( mwHead ) mwHead->prev = mw;
mwHead = mw;
if( mwTail == NULL ) mwTail = mw;
ptr = (char*)(void*)(mw+1);
PUTDWORD( PRECHK, ptr ); /* '*(long*)ptr = PRECHK;' */
ptr += sizeof(long);
p = ptr;
memset( ptr, MW_VAL_NEW, size );
ptr += size;
PUTDWORD( POSTCHK, ptr ); /* '*(long*)ptr = POSTCHK;' */
mwNumCurAlloc ++;
mwStatCurAlloc += (long) size;
mwStatTotAlloc += (long) size;
if( mwStatCurAlloc > mwStatMaxAlloc )
mwStatMaxAlloc = mwStatCurAlloc;
mwStatNumAlloc ++;
if( mwStatLevel ) mwStatAlloc( size, file, line );
return p;
}
void* mwRealloc( void *p, size_t size, const char* file, int line) {
int oldUseLimit, i;
mwData *mw;
char *ptr;
mwAutoInit();
if( p == NULL ) return mwMalloc( size, file, line );
if( size == 0 ) { mwFree( p, file, line ); return NULL; }
/* do the quick ownership test */
mw = (mwData*) ( ((char*)p)-sizeof(long)-sizeof(mwData) );
if( mwIsOwned( mw, file, line ) ) {
/* if the buffer is an NML, treat this as a double-free */
if( mw->flag & MW_NML )
{
mwIncErr();
if( *((unsigned char*)(mw+1)+sizeof(long)) != MW_VAL_NML )
{
mwWrite( "internal: <%ld> %s(%d), no-mans-land MW-%p is corrupted\n",
mwCounter, file, line, mw );
}
goto check_dbl_free;
}
/* if this allocation would violate the limit, fail it */
if( mwUseLimit && ((long)size + mwStatCurAlloc - (long)mw->size > mwAllocLimit) ) {
TESTS(file,line);
mwCounter ++;
mwWrite( "limit fail: <%ld> %s(%d), %ld wanted %ld available\n",
mwCounter, file, line, (unsigned long)size - mw->size, mwAllocLimit - mwStatCurAlloc );
mwIncErr();
FLUSH();
return NULL;
}
/* fake realloc operation */
oldUseLimit = mwUseLimit;
mwUseLimit = 0;
ptr = (char*) mwMalloc( size, file, line );
if( ptr != NULL ) {
if( size < mw->size )
memcpy( ptr, p, size );
else
memcpy( ptr, p, mw->size );
mwFree( p, file, line );
}
mwUseLimit = oldUseLimit;
return (void*) ptr;
}
/* Unknown pointer! */
/* using free'd pointer? */
check_dbl_free:
for(i=0;i<MW_FREE_LIST;i++) {
if( mwLastFree[i] == p ) {
mwIncErr();
mwWrite( "realloc: <%ld> %s(%d), %p was"
" freed from %s(%d)\n",
mwCounter, file, line, p,
mwLFfile[i], mwLFline[i] );
FLUSH();
return NULL;
}
}
/* some weird pointer */
mwIncErr();
mwWrite( "realloc: <%ld> %s(%d), unknown pointer %p\n",
mwCounter, file, line, p );
FLUSH();
return NULL;
}
char *mwStrdup( char* str, const char* file, int line ) {
size_t len;
char *newstring;
if( str == NULL ) {
mwIncErr();
mwWrite( "strdup: <%ld> %s(%d), strdup(NULL) called\n",
mwCounter, file, line );
FLUSH();
return NULL;
}
len = strlen( str ) + 1;
newstring = (char*) mwMalloc( len, file, line );
if( newstring != NULL ) memcpy( newstring, str, len );
return newstring;
}
void mwFree( void* p, const char* file, int line ) {
int i;
mwData* mw;
char buffer[ sizeof(mwData) + sizeof(long) + 64 ];
TESTS(file,line);
/* this code is in support of C++ delete */
if( file == NULL ) {
mwFree_( p );
return;
}
mwAutoInit();
mwCounter ++;
/* on NULL free, write a warning and return */
if( p == NULL ) {
mwWrite( "NULL free: <%ld> %s(%d), NULL pointer free'd\n",
mwCounter, file, line );
FLUSH();
return;
}
/* do the quick ownership test */
mw = (mwData*) ( ((char*)p)-sizeof(long)-sizeof(mwData) );
if( mwIsOwned( mw, file, line ) ) {
(void) mwTestBuf( mw, file, line );
/* if the buffer is an NML, treat this as a double-free */
if( mw->flag & MW_NML )
{
if( *((unsigned char*)(mw+1)+sizeof(long)) != MW_VAL_NML )
{
mwWrite( "internal: <%ld> %s(%d), no-mans-land MW-%p is corrupted\n",
mwCounter, file, line, mw );
}
goto check_dbl_free;
}
/* update the statistics */
mwNumCurAlloc --;
mwStatCurAlloc -= (long) mw->size;
if( mwStatLevel ) mwStatFree( mw->size, mw->file, mw->line );
/* we should either free the allocation or keep it as NML */
if( mwNML ) {
mw->flag |= MW_NML;
mwNmlNumAlloc ++;
mwNmlCurAlloc += (long) mw->size;
memset( (char*)(mw+1)+sizeof(long), MW_VAL_NML, mw->size );
}
else {
/* unlink the allocation, and enter the post-free data */
mwUnlink( mw, file, line );
memset( mw, MW_VAL_DEL,
mw->size + sizeof(mwData)+sizeof(long)+sizeof(long) );
if( mwFBI ) {
memset( mw, '.', sizeof(mwData) + sizeof(long) );
sprintf( buffer, "FBI<%ld>%s(%d)", mwCounter, file, line );
strncpy( (char*)(void*)mw, buffer, sizeof(mwData) + sizeof(long) );
}
free( mw );
}
/* add the pointer to the last-free track */
mwLFfile[ mwLFcur ] = file;
mwLFline[ mwLFcur ] = line;
mwLastFree[ mwLFcur++ ] = p;
if( mwLFcur == MW_FREE_LIST ) mwLFcur = 0;
return;
}
/* check for double-freeing */
check_dbl_free:
for(i=0;i<MW_FREE_LIST;i++) {
if( mwLastFree[i] == p ) {
mwIncErr();
mwWrite( "double-free: <%ld> %s(%d), %p was"
" freed from %s(%d)\n",
mwCounter, file, line, p,
mwLFfile[i], mwLFline[i] );
FLUSH();
return;
}
}
/* some weird pointer... block the free */
mwIncErr();
mwWrite( "WILD free: <%ld> %s(%d), unknown pointer %p\n",
mwCounter, file, line, p );
FLUSH();
return;
}
void* mwCalloc( size_t a, size_t b, const char *file, int line ) {
void *p;
size_t size = a * b;
p = mwMalloc( size, file, line );
if( p == NULL ) return NULL;
memset( p, 0, size );
return p;
}
void mwFree_( void *p ) {
TESTS(NULL,0);
free(p);
}
void* mwMalloc_( size_t size ) {
TESTS(NULL,0);
return malloc( size );
}
void* mwRealloc_( void *p, size_t size ) {
TESTS(NULL,0);
return realloc( p, size );
}
void* mwCalloc_( size_t a, size_t b ) {
TESTS(NULL,0);
return calloc( a, b );
}
void mwFlushNow( void ) {
if( mwLogR() ) fflush( mwLogR() );
return;
}
void mwDoFlush( int onoff ) {
mwFlushW( onoff<1?0:onoff );
if( onoff ) if( mwLogR() ) fflush( mwLogR() );
return;
}
void mwLimit( long lim ) {
TESTS(NULL,0);
mwWrite("limit: old limit = ");
if( !mwAllocLimit ) mwWrite( "none" );
else mwWrite( "%ld bytes", mwAllocLimit );
mwWrite( ", new limit = ");
if( !lim ) {
mwWrite( "none\n" );
mwUseLimit = 0;
}
else {
mwWrite( "%ld bytes\n", lim );
mwUseLimit = 1;
}
mwAllocLimit = lim;
FLUSH();
}
void mwSetAriAction( int action ) {
TESTS(NULL,0);
mwAriAction = action;
return;
}
int mwAssert( int exp, const char *exps, const char *fn, int ln ) {
int i;
char buffer[MW_TRACE_BUFFER+8];
TESTS(fn,ln);
if( exp ) return 0;
mwAutoInit();
mwIncErr();
mwCounter++;
mwWrite( "assert trap: <%ld> %s(%d), %s\n", mwCounter, fn, ln, exps );
if( mwAriFunction != NULL ) {
sprintf( buffer, "MEMWATCH: assert trap: %s(%d), %s", fn, ln, exps );
i = (*mwAriFunction)(buffer);
switch( i ) {
case MW_ARI_IGNORE:
mwWrite( "assert trap: <%ld> IGNORED - execution continues\n", mwCounter );
return 0;
case MW_ARI_RETRY:
mwWrite( "assert trap: <%ld> RETRY - executing again\n", mwCounter );
return 1;
}
}
else {
if( mwAriAction & MW_ARI_IGNORE ) {
mwWrite( "assert trap: <%ld> AUTO IGNORED - execution continues\n", mwCounter );
return 0;
}
fprintf(mwSTDERR,"\nMEMWATCH: assert trap: %s(%d), %s\n", fn, ln, exps );
}
FLUSH();
(void) mwTestNow( fn, ln, 1 );
FLUSH();
if( mwAriAction & MW_ARI_NULLREAD ) {
/* This is made in an attempt to kick in */
/* any debuggers or OS stack traces */
FLUSH();
/*lint -save -e413 */
i = *((int*)NULL);
mwDummy( (char)i );
/*lint -restore */
}
exit(255);
/* NOT REACHED - the return statement is in to keep */
/* stupid compilers from squeaking about differing return modes. */
/* Smart compilers instead say 'code unreachable...' */
/*lint -save -e527 */
return 0;
/*lint -restore */
}
int mwVerify( int exp, const char *exps, const char *fn, int ln ) {
int i;
char buffer[MW_TRACE_BUFFER+8];
TESTS(fn,ln);
if( exp ) return 0;
mwAutoInit();
mwIncErr();
mwCounter++;
mwWrite( "verify trap: <%ld> %s(%d), %s\n", mwCounter, fn, ln, exps );
if( mwAriFunction != NULL ) {
sprintf( buffer, "MEMWATCH: verify trap: %s(%d), %s", fn, ln, exps );
i = (*mwAriFunction)(buffer);
if( i == 0 ) {
mwWrite( "verify trap: <%ld> IGNORED - execution continues\n", mwCounter );
return 0;
}
if( i == 1 ) {
mwWrite( "verify trap: <%ld> RETRY - executing again\n", mwCounter );
return 1;
}
}
else {
if( mwAriAction & MW_ARI_NULLREAD ) {
/* This is made in an attempt to kick in */
/* any debuggers or OS stack traces */
FLUSH();
/*lint -save -e413 */
i = *((int*)NULL);
mwDummy( (char)i );
/*lint -restore */
}
if( mwAriAction & MW_ARI_IGNORE ) {
mwWrite( "verify trap: <%ld> AUTO IGNORED - execution continues\n", mwCounter );
return 0;
}
fprintf(mwSTDERR,"\nMEMWATCH: verify trap: %s(%d), %s\n", fn, ln, exps );
}
FLUSH();
(void) mwTestNow( fn, ln, 1 );
FLUSH();
exit(255);
/* NOT REACHED - the return statement is in to keep */
/* stupid compilers from squeaking about differing return modes. */
/* Smart compilers instead say 'code unreachable...' */
/*lint -save -e527 */
return 0;
/*lint -restore */
}
void mwTrace( const char *format, ... ) {
int tot, oflow = 0;
va_list mark;
mwAutoInit();
TESTS(NULL,0);
if( mwOutFunction == NULL ) mwOutFunction = mwDefaultOutFunc;
va_start( mark, format );
tot = vsprintf( mwPrintBuf, format, mark );
va_end( mark );
if( tot >= MW_TRACE_BUFFER ) { mwPrintBuf[MW_TRACE_BUFFER] = 0; oflow = 1; }
for(tot=0;mwPrintBuf[tot];tot++)
(*mwOutFunction)( mwPrintBuf[tot] );
if( oflow ) {
mwIncErr();
mwTrace( " [WARNING: OUTPUT BUFFER OVERFLOW - SYSTEM UNSTABLE]\n" );
}
FLUSH();
}
/***********************************************************************
** Grab & Drop
***********************************************************************/
unsigned mwGrab( unsigned kb ) {
TESTS(NULL,0);
return mwGrab_( kb, MW_VAL_GRB, 0 );
}
unsigned mwDrop( unsigned kb ) {
TESTS(NULL,0);
return mwDrop_( kb, MW_VAL_GRB, 0 );
}
static void mwDropAll() {
TESTS(NULL,0);
(void) mwDrop_( 0, MW_VAL_GRB, 0 );
(void) mwDrop_( 0, MW_VAL_NML, 0 );
if( mwGrabList != NULL )
mwWrite( "internal: the grab list is not empty after mwDropAll()\n");
}
static const char *mwGrabType( int type ) {
switch( type ) {
case MW_VAL_GRB:
return "grabbed";
case MW_VAL_NML:
return "no-mans-land";
default:
/* do nothing */
;
}
return "<unknown type>";
}
static unsigned mwGrab_( unsigned kb, int type, int silent ) {
unsigned i = kb;
mwGrabData *gd;
if( !kb ) i = kb = 65000U;
for(;kb;kb--) {
if( mwUseLimit &&
(mwStatCurAlloc + mwGrabSize + (long)sizeof(mwGrabData) > mwAllocLimit) ) {
if( !silent ) {
mwWrite("grabbed: all allowed memory to %s (%u kb)\n",
mwGrabType(type), i-kb);
FLUSH();
}
return i-kb;
}
gd = (mwGrabData*) malloc( sizeof(mwGrabData) );
if( gd == NULL ) {
if( !silent ) {
mwWrite("grabbed: all available memory to %s (%u kb)\n",
mwGrabType(type), i-kb);
FLUSH();
}
return i-kb;
}
mwGrabSize += (long) sizeof(mwGrabData);
gd->next = mwGrabList;
memset( gd->blob, type, sizeof(gd->blob) );
gd->type = type;
mwGrabList = gd;
}
if( !silent ) {
mwWrite("grabbed: %u kilobytes of %s memory\n", i, mwGrabType(type) );
FLUSH();
}
return i;
}
static unsigned mwDrop_( unsigned kb, int type, int silent ) {
unsigned i = kb;
mwGrabData *gd,*tmp,*pr;
const void *p;
if( mwGrabList == NULL && kb == 0 ) return 0;
if( !kb ) i = kb = 60000U;
pr = NULL;
gd = mwGrabList;
for(;kb;) {
if( gd == NULL ) {
if( i-kb > 0 && !silent ) {
mwWrite("dropped: all %s memory (%u kb)\n", mwGrabType(type), i-kb);
FLUSH();
}
return i-kb;
}
if( gd->type == type ) {
if( pr ) pr->next = gd->next;
kb --;
tmp = gd;
if( mwGrabList == gd ) mwGrabList = gd->next;
gd = gd->next;
p = mwTestMem( tmp->blob, sizeof( tmp->blob ), type );
if( p != NULL ) {
mwWrite( "wild pointer: <%ld> %s memory hit at %p\n",
mwCounter, mwGrabType(type), p );
FLUSH();
}
mwGrabSize -= (long) sizeof(mwGrabData);
free( tmp );
}
else {
pr = gd;
gd = gd->next;
}
}
if( !silent ) {
mwWrite("dropped: %u kilobytes of %s memory\n", i, mwGrabType(type) );
FLUSH();
}
return i;
}
/***********************************************************************
** No-Mans-Land
***********************************************************************/
void mwNoMansLand( int level ) {
mwAutoInit();
TESTS(NULL,0);
switch( level ) {
case MW_NML_NONE:
(void) mwDrop_( 0, MW_VAL_NML, 0 );
break;
case MW_NML_FREE:
break;
case MW_NML_ALL:
(void) mwGrab_( 0, MW_VAL_NML, 0 );
break;
default:
return;
}
mwNML = level;
}
/***********************************************************************
** Static functions
***********************************************************************/
static void mwAutoInit( void )
{
if( mwInited ) return;
mwUseAtexit = 1;
mwInit();
return;
}
static FILE *mwLogR() {
if( (mwLog == mwLogB1) && (mwLog == mwLogB2) ) return mwLog;
if( mwLog == mwLogB1 ) mwLogB2 = mwLog;
if( mwLog == mwLogB2 ) mwLogB1 = mwLog;
if( mwLogB1 == mwLogB2 ) mwLog = mwLogB1;
if( (mwLog == mwLogB1) && (mwLog == mwLogB2) ) {
mwWrite("internal: log file handle damaged and recovered\n");
FLUSH();
return mwLog;
}
fprintf(mwSTDERR,"\nMEMWATCH: log file handle destroyed, using mwSTDERR\n" );
mwLog = mwLogB1 = mwLogB2 = mwSTDERR;
return mwSTDERR;
}
static void mwLogW( FILE *p ) {
mwLog = mwLogB1 = mwLogB2 = p;
}
static int mwFlushR() {
if( (mwFlushing == mwFlushingB1) && (mwFlushing == mwFlushingB2) ) return mwFlushing;
if( mwFlushing == mwFlushingB1 ) mwFlushingB2 = mwFlushing;
if( mwFlushing == mwFlushingB2 ) mwFlushingB1 = mwFlushing;
if( mwFlushingB1 == mwFlushingB2 ) mwFlushing = mwFlushingB1;
if( (mwFlushing == mwFlushingB1) && (mwFlushing == mwFlushingB2) ) {
mwWrite("internal: flushing flag damaged and recovered\n");
FLUSH();
return mwFlushing;
}
mwWrite("internal: flushing flag destroyed, so set to true\n");
mwFlushing = mwFlushingB1 = mwFlushingB2 = 1;
return 1;
}
static void mwFlushW( int n ) {
mwFlushing = mwFlushingB1 = mwFlushingB2 = n;
}
static void mwIncErr() {
mwErrors++;
mwFlushW( mwFlushR()+1 );
FLUSH();
}
static void mwFlush() {
if( mwLogR() == NULL ) return;
#ifdef MW_FLUSH
fflush( mwLogR() );
#else
if( mwFlushR() ) fflush( mwLogR() );
#endif
return;
}
static void mwUnlink( mwData* mw, const char* file, int line ) {
if( mw->prev == NULL ) {
if( mwHead != mw )
mwWrite( "internal: <%ld> %s(%d), MW-%p: link1 NULL, but not head\n",
mwCounter, file, line, mw );
mwHead = mw->next;
}
else {
if( mw->prev->next != mw )
mwWrite( "internal: <%ld> %s(%d), MW-%p: link1 failure\n",
mwCounter, file, line, mw );
else mw->prev->next = mw->next;
}
if( mw->next == NULL ) {
if( mwTail != mw )
mwWrite( "internal: <%ld> %s(%d), MW-%p: link2 NULL, but not tail\n",
mwCounter, file, line, mw );
mwTail = mw->prev;
}
else {
if( mw->next->prev != mw )
mwWrite( "internal: <%ld> %s(%d), MW-%p: link2 failure\n",
mwCounter, file, line, mw );
else mw->next->prev = mw->prev;
}
}
/*
** Relinking tries to repair a damaged mw block.
** Returns nonzero if it thinks it successfully
** repaired the heap chain.
*/
static int mwRelink( mwData* mw, const char* file, int line ) {
int fails;
mwData *mw1, *mw2;
long count, size;
mwStat *ms;
if( file == NULL ) file = "unknown";
if( mw == NULL ) {
mwWrite("relink: cannot repair MW at NULL\n");
FLUSH();
goto emergency;
}
if( !mwIsSafeAddr(mw, sizeof(mwData)) ) {
mwWrite("relink: MW-%p is a garbage pointer\n");
FLUSH();
goto emergency;
}
mwWrite("relink: <%ld> %s(%d) attempting to repair MW-%p...\n", mwCounter, file, line, mw );
FLUSH();
fails = 0;
/* Repair from head */
if( mwHead != mw ) {
if( !mwIsSafeAddr( mwHead, sizeof(mwData) ) ) {
mwWrite("relink: failed for MW-%p; head pointer destroyed\n", mw );
FLUSH();
goto emergency;
}
for( mw1=mwHead; mw1; mw1=mw1->next ) {
if( mw1->next == mw ) {
mw->prev = mw1;
break;
}
if( mw1->next &&
( !mwIsSafeAddr(mw1->next, sizeof(mwData)) || mw1->next->prev != mw1) ) {
mwWrite("relink: failed for MW-%p; forward chain fragmented at MW-%p: 'next' is %p\n", mw, mw1, mw1->next );
FLUSH();
goto emergency;
}
}
if( mw1 == NULL ) {
mwWrite("relink: MW-%p not found in forward chain search\n", mw );
FLUSH();
fails ++;
}
}
else
{
mwWrite( "relink: MW-%p is the head (first) allocation\n", mw );
if( mw->prev != NULL )
{
mwWrite( "relink: MW-%p prev pointer is non-NULL, you have a wild pointer\n", mw );
mw->prev = NULL;
}
}
/* Repair from tail */
if( mwTail != mw ) {
if( !mwIsSafeAddr( mwTail, sizeof(mwData) ) ) {
mwWrite("relink: failed for MW-%p; tail pointer destroyed\n", mw );
FLUSH();
goto emergency;
}
for( mw1=mwTail; mw1; mw1=mw1->prev ) {
if( mw1->prev == mw ) {
mw->next = mw1;
break;
}
if( mw1->prev && (!mwIsSafeAddr(mw1->prev, sizeof(mwData)) || mw1->prev->next != mw1) ) {
mwWrite("relink: failed for MW-%p; reverse chain fragmented at MW-%p, 'prev' is %p\n", mw, mw1, mw1->prev );
FLUSH();
goto emergency;
}
}
if( mw1 == NULL ) {
mwWrite("relink: MW-%p not found in reverse chain search\n", mw );
FLUSH();
fails ++;
}
}
else
{
mwWrite( "relink: MW-%p is the tail (last) allocation\n", mw );
if( mw->next != NULL )
{
mwWrite( "relink: MW-%p next pointer is non-NULL, you have a wild pointer\n", mw );
mw->next = NULL;
}
}
if( fails > 1 ) {
mwWrite("relink: heap appears intact, MW-%p probably garbage pointer\n", mw );
FLUSH();
goto verifyok;
}
/* restore MW info where possible */
if( mwIsReadAddr( mw->file, 1 ) ) {
ms = mwStatGet( mw->file, -1, 0 );
if( ms == NULL ) mw->file = "<relinked>";
}
mw->check = CHKVAL(mw);
goto verifyok;
/* Emergency repair */
emergency:
if( mwHead == NULL && mwTail == NULL )
{
if( mwStatCurAlloc == 0 )
mwWrite("relink: <%ld> %s(%d) heap is empty, nothing to repair\n", mwCounter, file, line );
else
mwWrite("relink: <%ld> %s(%d) heap damaged beyond repair\n", mwCounter, file, line );
FLUSH();
return 0;
}
mwWrite("relink: <%ld> %s(%d) attempting emergency repairs...\n", mwCounter, file, line );
FLUSH();
if( mwHead == NULL || mwTail == NULL )
{
if( mwHead == NULL ) mwWrite("relink: mwHead is NULL, but mwTail is %p\n", mwTail );
else mwWrite("relink: mwTail is NULL, but mwHead is %p\n", mwHead );
}
mw1=NULL;
if( mwHead != NULL )
{
if( !mwIsReadAddr(mwHead,sizeof(mwData)) || mwHead->check != CHKVAL(mwHead) )
{
mwWrite("relink: mwHead (MW-%p) is damaged, skipping forward scan\n", mwHead );
mwHead = NULL;
goto scan_reverse;
}
if( mwHead->prev != NULL )
{
mwWrite("relink: the mwHead pointer's 'prev' member is %p, not NULL\n", mwHead->prev );
}
for( mw1=mwHead; mw1; mw1=mw1->next )
{
if( mw1->next )
{
if( !mwIsReadAddr(mw1->next,sizeof(mwData)) ||
!mw1->next->check != CHKVAL(mw1) ||
mw1->next->prev != mw1 )
{
mwWrite("relink: forward chain's last intact MW is MW-%p, %ld %sbytes at %s(%d)\n",
mw1, mw1->size, (mw->flag & MW_NML)?"NoMansLand ":"", mw1->file, mw1->line );
if( mwIsReadAddr(mw1->next,sizeof(mwData) ) )
{
mwWrite("relink: forward chain's first damaged MW is MW-%p, %ld %sbytes at %s(%d)\n",
mw1->next, mw1->size, (mw->flag & MW_NML)?"NoMansLand ":"",
mwIsReadAddr(mw1->file,16)?mw1->file:"<garbage-pointer>", mw1->line );
}
else
{
mwWrite("relink: the 'next' pointer of this MW points to %p, which is out-of-legal-access\n",
mw1->next );
}
break;
}
}
}
}
scan_reverse:
mw2=NULL;
if( mwTail != NULL )
{
if( !mwIsReadAddr(mwTail,sizeof(mwData)) || mwTail->check != CHKVAL(mwTail) )
{
mwWrite("relink: mwTail (%p) is damaged, skipping reverse scan\n", mwTail );
mwTail = NULL;
goto analyze;
}
if( mwTail->next != NULL )
{
mwWrite("relink: the mwTail pointer's 'next' member is %p, not NULL\n", mwTail->next );
}
for( mw2=mwTail; mw2; mw2=mw2->prev )
{
if( mw2->prev )
{
if( !mwIsReadAddr(mw2->prev,sizeof(mwData)) ||
!mw2->prev->check != CHKVAL(mw2) ||
mw2->prev->next != mw2 )
{
mwWrite("relink: reverse chain's last intact MW is MW-%p, %ld %sbytes at %s(%d)\n",
mw2, mw2->size, (mw->flag & MW_NML)?"NoMansLand ":"", mw2->file, mw2->line );
if( mwIsReadAddr(mw2->prev,sizeof(mwData) ) )
{
mwWrite("relink: reverse chain's first damaged MW is MW-%p, %ld %sbytes at %s(%d)\n",
mw2->prev, mw2->size, (mw->flag & MW_NML)?"NoMansLand ":"",
mwIsReadAddr(mw2->file,16)?mw2->file:"<garbage-pointer>", mw2->line );
}
else
{
mwWrite("relink: the 'prev' pointer of this MW points to %p, which is out-of-legal-access\n",
mw2->prev );
}
break;
}
}
}
}
analyze:
if( mwHead == NULL && mwTail == NULL )
{
mwWrite("relink: both head and tail pointers damaged, aborting program\n");
mwFlushW(1);
FLUSH();
abort();
}
if( mwHead == NULL )
{
mwHead = mw2;
mwWrite("relink: heap truncated, MW-%p designated as new mwHead\n", mw2 );
mw2->prev = NULL;
mw1 = mw2 = NULL;
}
if( mwTail == NULL )
{
mwTail = mw1;
mwWrite("relink: heap truncated, MW-%p designated as new mwTail\n", mw1 );
mw1->next = NULL;
mw1 = mw2 = NULL;
}
if( mw1 == NULL && mw2 == NULL &&
mwHead->prev == NULL && mwTail->next == NULL ) {
mwWrite("relink: verifying heap integrity...\n" );
FLUSH();
goto verifyok;
}
if( mw1 && mw2 && mw1 != mw2 ) {
mw1->next = mw2;
mw2->prev = mw1;
mwWrite("relink: emergency repairs successful, assessing damage...\n");
FLUSH();
}
else {
mwWrite("relink: heap totally destroyed, aborting program\n");
mwFlushW(1);
FLUSH();
abort();
}
/* Verify by checking that the number of active allocations */
/* match the number of entries in the chain */
verifyok:
if( !mwIsHeapOK( NULL ) ) {
mwWrite("relink: heap verification FAILS - aborting program\n");
mwFlushW(1);
FLUSH();
abort();
}
for( size=count=0, mw1=mwHead; mw1; mw1=mw1->next ) {
count ++;
size += (long) mw1->size;
}
if( count == mwNumCurAlloc ) {
mwWrite("relink: successful, ");
if( size == mwStatCurAlloc ) {
mwWrite("no allocations lost\n");
}
else {
if( mw != NULL ) {
mwWrite("size information lost for MW-%p\n", mw);
mw->size = 0;
}
}
}
else {
mwWrite("relink: partial, %ld MW-blocks of %ld bytes lost\n",
mwNmlNumAlloc+mwNumCurAlloc-count, mwNmlCurAlloc+mwStatCurAlloc-size );
return 0;
}
return 1;
}
/*
** If mwData* is NULL:
** Returns 0 if heap chain is broken.
** Returns 1 if heap chain is intact.
** If mwData* is not NULL:
** Returns 0 if mwData* is missing or if chain is broken.
** Returns 1 if chain is intact and mwData* is found.
*/
static int mwIsHeapOK( mwData *includes_mw ) {
int found = 0;
mwData *mw;
for( mw = mwHead; mw; mw=mw->next ) {
if( includes_mw == mw ) found++;
if( !mwIsSafeAddr( mw, sizeof(mwData) ) ) return 0;
if( mw->prev ) {
if( !mwIsSafeAddr( mw->prev, sizeof(mwData) ) ) return 0;
if( mw==mwHead || mw->prev->next != mw ) return 0;
}
if( mw->next ) {
if( !mwIsSafeAddr( mw->next, sizeof(mwData) ) ) return 0;
if( mw==mwTail || mw->next->prev != mw ) return 0;
}
else if( mw!=mwTail ) return 0;
}
if( includes_mw != NULL && !found ) return 0;
return 1;
}
static int mwIsOwned( mwData* mw, const char *file, int line ) {
int retv;
mwStat *ms;
/* see if the address is legal according to OS */
if( !mwIsSafeAddr( mw, sizeof(mwData) ) ) return 0;
/* make sure we have _anything_ allocated */
if( mwHead == NULL && mwTail == NULL && mwStatCurAlloc == 0 )
return 0;
/* calculate checksum */
if( mw->check != CHKVAL(mw) ) {
/* may be damaged checksum, see if block is in heap */
if( mwIsHeapOK( mw ) ) {
/* damaged checksum, repair it */
mwWrite( "internal: <%ld> %s(%d), checksum for MW-%p is incorrect\n",
mwCounter, file, line, mw );
mwIncErr();
if( mwIsReadAddr( mw->file, 1 ) ) {
ms = mwStatGet( mw->file, -1, 0 );
if( ms == NULL ) mw->file = "<relinked>";
}
else mw->file = "<unknown>";
mw->check = CHKVAL(mw);
return 1;
}
/* no, it's just some garbage data */
return 0;
}
/* check that the non-NULL pointers are safe */
if( mw->prev && !mwIsSafeAddr( mw->prev, sizeof(mwData) ) ) mwRelink( mw, file, line );
if( mw->next && !mwIsSafeAddr( mw->next, sizeof(mwData) ) ) mwRelink( mw, file, line );
/* safe address, checksum OK, proceed with heap checks */
/* see if the block is in the heap */
retv = 0;
if( mw->prev ) { if( mw->prev->next == mw ) retv ++; }
else { if( mwHead == mw ) retv++; }
if( mw->next ) { if( mw->next->prev == mw ) retv ++; }
else { if( mwTail == mw ) retv++; }
if( mw->check == CHKVAL(mw) ) retv ++;
if( retv > 2 ) return 1;
/* block not in heap, check heap for corruption */
if( !mwIsHeapOK( mw ) ) {
if( mwRelink( mw, file, line ) )
return 1;
}
/* unable to repair */
mwWrite( "internal: <%ld> %s(%d), mwIsOwned fails for MW-%p\n",
mwCounter, file, line, mw );
mwIncErr();
return 0;
}
/*
** mwTestBuf:
** Checks a buffers links and pre/postfixes.
** Writes errors found to the log.
** Returns zero if no errors found.
*/
static int mwTestBuf( mwData* mw, const char* file, int line ) {
int retv = 0;
char *p;
long chk;
if( file == NULL ) file = "unknown";
if( !mwIsSafeAddr( mw, sizeof(mwData) ) ) {
mwWrite( "internal: <%ld> %s(%d): pointer MW-%p is invalid\n",
mwCounter, file, line, mw );
mwIncErr();
return 2;
}
if( mw->check != CHKVAL(mw) ) {
mwWrite( "internal: <%ld> %s(%d), info trashed; relinking\n",
mwCounter, file, line );
mwIncErr();
if( !mwRelink( mw, file, line ) ) return 2;
}
if( mw->prev && mw->prev->next != mw ) {
mwWrite( "internal: <%ld> %s(%d), buffer <%ld> %s(%d) link1 broken\n",
mwCounter,file,line, (long)mw->size, mw->count, mw->file, mw->line );
mwIncErr();
if( !mwRelink( mw, file, line ) ) retv = 2;
}
if( mw->next && mw->next->prev != mw ) {
mwWrite( "internal: <%ld> %s(%d), buffer <%ld> %s(%d) link2 broken\n",
mwCounter,file,line, (long)mw->size, mw->count, mw->file, mw->line );
mwIncErr();
if( !mwRelink( mw, file, line ) ) retv = 2;
}
p = (char*)(mw+1);
GETDWORD( chk, p );
if( chk != PRECHK ) {
mwWrite( "underflow: <%ld> %s(%d), %ld bytes alloc'd at <%ld> %s(%d)\n",
mwCounter,file,line, (long)mw->size, mw->count, mw->file, mw->line );
mwIncErr();
retv = 1;
}
p += mw->size + sizeof(long);
GETDWORD( chk, p );
if( chk != POSTCHK ) {
mwWrite( "overflow: <%ld> %s(%d), %ld bytes alloc'd at <%ld> %s(%d)\n",
mwCounter,file,line, (long)mw->size, mw->count, mw->file, mw->line );
mwIncErr();
retv = 1;
}
return retv;
}
static void mwDefaultOutFunc( int c ) {
if( mwLogR() ) fputc( c, mwLogR() );
}
static void mwWrite( const char *format, ... ) {
int tot, oflow = 0;
va_list mark;
mwAutoInit();
if( mwOutFunction == NULL ) mwOutFunction = mwDefaultOutFunc;
va_start( mark, format );
tot = vsprintf( mwPrintBuf, format, mark );
va_end( mark );
if( tot >= MW_TRACE_BUFFER ) { mwPrintBuf[MW_TRACE_BUFFER] = 0; oflow = 1; }
for(tot=0;mwPrintBuf[tot];tot++)
(*mwOutFunction)( mwPrintBuf[tot] );
if( oflow ) {
mwWrite( "\ninternal: mwWrite(): WARNING! OUTPUT EXCEEDED %u CHARS: SYSTEM UNSTABLE\n", MW_TRACE_BUFFER-1 );
FLUSH();
}
return;
}
static void mwLogFile( const char *name ) {
time_t tid;
(void) time( &tid );
if( mwLogR() != NULL ) {
fclose( mwLogR() );
mwLogW( NULL );
}
if( name == NULL ) return;
mwLogW( fopen( name, "a" COMMIT ) );
if( mwLogR() == NULL )
mwWrite( "logfile: failed to open/create file '%s'\n", name );
}
/*
** Try to free NML memory until a contiguous allocation of
** 'needed' bytes can be satisfied. If this is not enough
** and the 'urgent' parameter is nonzero, grabbed memory is
** also freed.
*/
static size_t mwFreeUp( size_t needed, int urgent ) {
void *p;
mwData *mw, *mw2;
char *data;
/* free grabbed NML memory */
for(;;) {
if( mwDrop_( 1, MW_VAL_NML, 1 ) == 0 ) break;
p = malloc( needed );
if( p == NULL ) continue;
free( p );
return needed;
}
/* free normal NML memory */
mw = mwHead;
while( mw != NULL ) {
if( !(mw->flag & MW_NML) ) mw = mw->next;
else {
data = ((char*)(mw+1)) + sizeof(long);
if( mwTestMem( data, mw->size, MW_VAL_NML ) ) {
mwIncErr();
mwWrite( "wild pointer: <%ld> NoMansLand %p alloc'd at %s(%d)\n",
mw->count, data + sizeof(long), mw->file, mw->line );
}
mw2 = mw->next;
mwUnlink( mw, "mwFreeUp", 0 );
free( mw );
mw = mw2;
p = malloc( needed );
if( p == NULL ) continue;
free( p );
return needed;
}
}
/* if not urgent (for internal purposes), fail */
if( !urgent ) return 0;
/* free grabbed memory */
for(;;) {
if( mwDrop_( 1, MW_VAL_GRB, 1 ) == 0 ) break;
p = malloc( needed );
if( p == NULL ) continue;
free( p );
return needed;
}
return 0;
}
static const void * mwTestMem( const void *p, unsigned len, int c ) {
const unsigned char *ptr;
ptr = (const unsigned char *) p;
while( len-- ) {
if( *ptr != (unsigned char)c ) return (const void*)ptr;
ptr ++;
}
return NULL;
}
static int mwStrCmpI( const char *s1, const char *s2 ) {
if( s1 == NULL || s2 == NULL ) return 0;
while( *s1 ) {
if( toupper(*s2) == toupper(*s1) ) { s1++; s2++; continue; }
return 1;
}
return 0;
}
#define AIPH() if( always_invoked ) { mwWrite("autocheck: <%ld> %s(%d) ", mwCounter, file, line ); always_invoked = 0; }
static int mwTestNow( const char *file, int line, int always_invoked ) {
int retv = 0;
mwData *mw;
char *data;
if( file && !always_invoked )
mwWrite("check: <%ld> %s(%d), checking %s%s%s\n",
mwCounter, file, line,
(mwTestFlags & MW_TEST_CHAIN) ? "chain ": "",
(mwTestFlags & MW_TEST_ALLOC) ? "alloc ": "",
(mwTestFlags & MW_TEST_NML) ? "nomansland ": ""
);
if( mwTestFlags & MW_TEST_CHAIN ) {
for( mw = mwHead; mw; mw=mw->next ) {
if( !mwIsSafeAddr(mw, sizeof(mwData)) ) {
AIPH();
mwWrite("check: heap corruption detected\n");
mwIncErr();
return retv + 1;
}
if( mw->prev ) {
if( !mwIsSafeAddr(mw->prev, sizeof(mwData)) ) {
AIPH();
mwWrite("check: heap corruption detected\n");
mwIncErr();
return retv + 1;
}
if( mw==mwHead || mw->prev->next != mw ) {
AIPH();
mwWrite("check: heap chain broken, prev link incorrect\n");
mwIncErr();
retv ++;
}
}
if( mw->next ) {
if( !mwIsSafeAddr(mw->next, sizeof(mwData)) ) {
AIPH();
mwWrite("check: heap corruption detected\n");
mwIncErr();
return retv + 1;
}
if( mw==mwTail || mw->next->prev != mw ) {
AIPH();
mwWrite("check: heap chain broken, next link incorrect\n");
mwIncErr();
retv ++;
}
}
else if( mw!=mwTail ) {
AIPH();
mwWrite("check: heap chain broken, tail incorrect\n");
mwIncErr();
retv ++;
}
}
}
if( mwTestFlags & MW_TEST_ALLOC ) {
for( mw = mwHead; mw; mw=mw->next ) {
if( mwTestBuf( mw, file, line ) ) retv ++;
}
}
if( mwTestFlags & MW_TEST_NML ) {
for( mw = mwHead; mw; mw=mw->next ) {
if( (mw->flag & MW_NML) ) {
data = ((char*)(mw+1)) + sizeof(long);
if( mwTestMem( data, mw->size, MW_VAL_NML ) ) {
mwIncErr();
mwWrite( "wild pointer: <%ld> NoMansLand %p alloc'd at %s(%d)\n",
mw->count, data + sizeof(long), mw->file, mw->line );
}
}
}
}
if( file && !always_invoked && !retv )
mwWrite("check: <%ld> %s(%d), complete; no errors\n",
mwCounter, file, line );
return retv;
}
/**********************************************************************
** Statistics
**********************************************************************/
static void mwStatReport()
{
mwStat* ms, *ms2;
const char *modname;
int modnamelen;
/* global statistics report */
mwWrite( "\nMemory usage statistics (global):\n" );
mwWrite( " N)umber of allocations made: %ld\n", mwStatNumAlloc );
mwWrite( " L)argest memory usage : %ld\n", mwStatMaxAlloc );
mwWrite( " T)otal of all alloc() calls: %ld\n", mwStatTotAlloc );
mwWrite( " U)nfreed bytes totals : %ld\n", mwStatCurAlloc );
FLUSH();
if( mwStatLevel < 1 ) return;
/* on a per-module basis */
mwWrite( "\nMemory usage statistics (detailed):\n");
mwWrite( " Module/Line Number Largest Total Unfreed \n");
for( ms=mwStatList; ms; ms=ms->next )
{
if( ms->line == -1 )
{
if( ms->file == NULL || !mwIsReadAddr(ms->file,22) ) modname = "<unknown>";
else modname = ms->file;
modnamelen = strlen(modname);
if( modnamelen > 42 )
{
modname = modname + modnamelen - 42;
}
mwWrite(" %-42s %-8ld %-8ld %-8ld %-8ld\n",
modname, ms->num, ms->max, ms->total, ms->curr );
if( ms->file && mwStatLevel > 1 )
{
for( ms2=mwStatList; ms2; ms2=ms2->next )
{
if( ms2->line!=-1 && ms2->file!=NULL && !mwStrCmpI( ms2->file, ms->file ) )
{
mwWrite( " %-8d %-8ld %-8ld %-8ld %-8ld\n",
ms2->line, ms2->num, ms2->max, ms2->total, ms2->curr );
}
}
}
}
}
}
static mwStat* mwStatGet( const char *file, int line, int makenew ) {
mwStat* ms;
if( mwStatLevel < 2 ) line = -1;
for( ms=mwStatList; ms!=NULL; ms=ms->next ) {
if( line != ms->line ) continue;
if( file==NULL ) {
if( ms->file == NULL ) break;
continue;
}
if( ms->file == NULL ) continue;
if( !strcmp( ms->file, file ) ) break;
}
if( ms != NULL ) return ms;
if( !makenew ) return NULL;
ms = (mwStat*) malloc( sizeof(mwStat) );
if( ms == NULL ) {
if( mwFreeUp( sizeof(mwStat), 0 ) < sizeof(mwStat) ||
(ms=(mwStat*)malloc(sizeof(mwStat))) == NULL ) {
mwWrite("internal: memory low, statistics incomplete for '%s'\n", file );
return NULL;
}
}
ms->file = file;
ms->line = line;
ms->total = 0L;
ms->max = 0L;
ms->num = 0L;
ms->curr = 0L;
ms->next = mwStatList;
mwStatList = ms;
return ms;
}
static void mwStatAlloc( size_t size, const char* file, int line ) {
mwStat* ms;
/* update the module statistics */
ms = mwStatGet( file, -1, 1 );
if( ms != NULL ) {
ms->total += (long) size;
ms->curr += (long) size;
ms->num ++;
if( ms->curr > ms->max ) ms->max = ms->curr;
}
/* update the line statistics */
if( mwStatLevel > 1 && line != -1 && file ) {
ms = mwStatGet( file, line, 1 );
if( ms != NULL ) {
ms->total += (long) size;
ms->curr += (long) size;
ms->num ++;
if( ms->curr > ms->max ) ms->max = ms->curr;
}
}
}
static void mwStatFree( size_t size, const char* file, int line ) {
mwStat* ms;
/* update the module statistics */
ms = mwStatGet( file, -1, 1 );
if( ms != NULL ) ms->curr -= (long) size;
/* update the line statistics */
if( mwStatLevel > 1 && line != -1 && file ) {
ms = mwStatGet( file, line, 1 );
if( ms != NULL ) ms->curr -= (long) size;
}
}
#if 0 /* 980317: disabled C++ */
/**********************************************************************
** C++ new & delete
**********************************************************************/
#ifdef __cplusplus
#ifndef MEMWATCH_NOCPP
int mwNCur = 0;
const char *mwNFile = NULL;
int mwNLine = 0;
class MemWatch {
public:
MemWatch();
~MemWatch();
};
MemWatch::MemWatch() {
if( mwInited ) return;
mwUseAtexit = 0;
mwInit();
}
MemWatch::~MemWatch() {
if( mwUseAtexit ) return;
mwTerm();
}
/*
** This global new will catch all 'new' calls where MEMWATCH is
** not active.
*/
void* operator new( unsigned size ) {
mwNCur = 0;
return mwMalloc( size, "<unknown>", 0 );
}
/*
** This is the new operator that's called when a module uses mwNew.
*/
void* operator new( unsigned size, const char *file, int line ) {
mwNCur = 0;
return mwMalloc( size, file, line );
}
/*
** Since this delete operator will recieve ALL delete's
** even those from within libraries, we must accept
** delete's before we've been initialized. Nor can we
** reliably check for wild free's if the mwNCur variable
** is not set.
*/
void operator delete( void *p ) {
if( p == NULL ) return;
if( !mwInited ) {
free( p );
return;
}
if( mwNCur ) {
mwFree( p, mwNFile, mwNLine );
mwNCur = 0;
return;
}
mwFree_( p );
}
#endif /* MEMWATCH_NOCPP */
#endif /* __cplusplus */
#endif /* 980317: disabled C++ */
#endif /* MEMWATCH.C */
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