cml/libcm
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Kods Problēmas Izmaiņu pieprasījumi Laidieni Vikivietne Aktivitāte
2d85218c4b
libcm/cmMem.c

719 rindas
20 KiB
C
Neapstrādāts Vainot Vēsture

#include "cmPrefix.h"
#include "cmGlobal.h"
#include "cmRpt.h"
#include "cmErr.h"
#include "cmMem.h"
#include "cmFloatTypes.h"
#include "cmMath.h"
#include "cmThread.h"
// Block layout
//
// |a |b |c |d |e |f
// |xx...xxx|yyyy|zzzz|gggggggg|ddd...ddd|gggggggg|
//
//
// xxxx = alignment (prefix) bytes - size is given by yyyy (may contain up to alignByteCnt-1 bytes).
// yyyy = count of bytes preceding yyyy
// zzzz = count of data bytes
// gggg = guard area (size is fixed by guardByteCnt arg. to cmMemInitialize())
// dddd = data area
//
// d = e - guardByteCnt
// c = d - sizeof(unsigned)
// b = c - sizeof(unsigned)
// a = b - yyyy
//
// Notes:
// 1) The smallest allocation is dataByteCnt + (2*sizeof(unsigned)
// 2) If allocByteCnt > 0 then the smallest allocation is allocByteCnt + (2*sizeof(unsigned)) + dataByteCnt.
//
#define _cmMmDataToByteCntPtr( dp, gbc ) (dp==NULL?NULL:(((char*)(dp))-(gbc)-sizeof(unsigned)))
#define _cmMmDataToByteCnt( dp, gbc ) (dp==NULL?0 :(*(unsigned*)_cmMmDataToByteCntPtr(dp,gbc)))
#define _cmMmDataToPrefixCntPtr( dp, gbc ) (dp==NULL?NULL:( _cmMmDataToByteCntPtr(dp,gbc) - sizeof(unsigned)))
#define _cmMmDataToPrefixCnt( dp, gbc ) (dp==NULL?0 :(*(unsigned*)_cmMmDataToPrefixCntPtr(dp,gbc)))
#define _cmMmDataToBasePtr( dp, gbc ) (dp==NULL?NULL:(_cmMmDataToPrefixCntPtr(dp,gbc) - _cmMmDataToPrefixCnt(dp,gbc)))
#define _cmMmDataToTotalByteCnt( dp, gbc ) (dp==NULL?0 :(sizeof(unsigned) + (2*gbc) + _cmMmDataToByteCnt(dp,gbc) + (_cmMmDataToPrefixCnt(dp,gbc) + sizeof(unsigned))))
#define _cmMmDataToPreGuardPtr( dp, gbc ) (dp==NULL?NULL:(((char*)(dp))-(gbc)))
#define _cmMmDataToPostGuardPtr( dp, gbc ) (dp==NULL?NULL:(((char*)(dp))+_cmMmDataToByteCnt(dp,gbc)))
enum
{
kFreedMmFl = 0x01,
kDblFreeMmFl = 0x02
};
typedef struct cmMmRecd_str
{
unsigned uniqueId; //
void* dataPtr; // dataPtr may be NULL if the assoc'd alloc request was for 0 bytes.
unsigned dataByteCnt; // data area bytes on original allocation
unsigned fileLine;
const char* fileNameStr;
const char* funcNameStr;
unsigned flags;
struct cmMmRecd_str* linkPtr;
} cmMmRecd_t;
typedef struct
{
cmRpt_t* rpt;
cmErr_t err;
cmMmRecd_t* listPtr;
unsigned nextId;
unsigned alignByteCnt;
unsigned guardByteCnt;
cmAllocMmFunc_t allocFunc;
cmFreeMmFunc_t freeFunc;
void* funcArgPtr;
char uninitChar;
char freeChar;
char guardChar;
unsigned flags;
} cmMm_t;
cmMmH_t cmMmNullHandle = { NULL };
cmMm_t* _cmMmHandleToPtr( cmMmH_t h )
{
assert(h.h != NULL );
return (cmMm_t*)h.h;
}
cmMmRC_t _cmMmCheckGuards( cmMm_t* p, cmMmRecd_t* rp )
{
// it is possible that dataPtr is NULL if zero bytes was requested at allocation
if( rp->dataPtr == NULL )
return kOkMmRC;
// check the pre data area guard space
char* pp = _cmMmDataToPreGuardPtr( rp->dataPtr, p->guardByteCnt );
char* ep = pp + p->guardByteCnt;
for(;pp<ep; ++pp)
if( *pp != p->guardChar )
return kGuardCorruptMmRC;
// check the post data area guard space
pp = _cmMmDataToPostGuardPtr( rp->dataPtr, p->guardByteCnt );
ep = pp + p->guardByteCnt;
for(;pp<ep; ++pp)
if( *pp != p->guardChar )
return kGuardCorruptMmRC;
// if this block was freed and the kFillFreedMmFl was set then check for write-after-free
if( cmIsFlag(rp->flags,kFreedMmFl) && cmIsFlag(p->flags,kFillFreedMmFl) )
{
pp = rp->dataPtr;
ep = pp + _cmMmDataToByteCnt(pp,p->guardByteCnt);
for(; pp<ep; ++pp)
if( *pp != p->freeChar )
return kWriteAfterFreeMmRC;
}
return kOkMmRC;
}
cmMmRecd_t* _cmMmFindRecd( cmMm_t* p, const void* dataPtr )
{
cmMmRecd_t* rp = p->listPtr;
while( rp != NULL )
{
if( rp->dataPtr == dataPtr )
break;
rp = rp->linkPtr;
}
return rp;
}
cmMmRC_t _cmMmFree( cmMm_t* p, void* dataPtr, cmMmRecd_t* rp )
{
cmMmRC_t rc = kOkMmRC;
if( p->freeFunc(p->funcArgPtr, _cmMmDataToBasePtr(dataPtr,p->guardByteCnt)) == false )
{
if( rp == NULL )
rc = cmErrMsg(&p->err,kFreeFailMmRC,"Memory free failed on data area at %p.",dataPtr);
else
rc = cmErrMsg(&p->err,kFreeFailMmRC,"Memory free failed on data area at %p. Allocated with id:%i at %s line:%i %s.",dataPtr, rp->uniqueId,rp->funcNameStr,rp->fileLine,rp->fileNameStr);
}
return rc;
}
cmMmRC_t _cmMmFreeP( cmMm_t* p, void* dataPtr )
{
if( dataPtr == NULL )
return kOkMmRC;
cmMmRecd_t* rp = p->listPtr;
cmMmRC_t rc = kOkMmRC;
// if we are tracking alloc's and free's
if( cmIsFlag(p->flags,kTrackMmFl) )
{
// locate the tracking recd
rp = _cmMmFindRecd(p,dataPtr);
// if no tracking recd was found
if( rp == NULL )
return cmErrMsg(&p->err,kMissingRecdMmRC,"Unable to locate a tracking record associated with released data area pointer:%p.",dataPtr);
/*
if( rp->uniqueId == 176690 )
{
cmErrMsg(&p->err,kOkMmRC,"Breakpoint for memory free id:%i.",rp->uniqueId);
}
*/
// if this block was already freed then this is a double free
if( cmIsFlag(rp->flags,kFreedMmFl) )
rp->flags = cmSetFlag(rp->flags,kDblFreeMmFl);
else
// otherwise fill the freed block with the freeChar (if requested)
if( cmIsFlag(p->flags,kFillFreedMmFl) )
memset(dataPtr, p->freeChar, _cmMmDataToByteCnt(dataPtr,p->guardByteCnt));
// mark the block as having been freed
rp->flags = cmSetFlag(rp->flags,kFreedMmFl);
}
// if we are not deferring free to the finalize stage ... then free the memory here
if( cmIsFlag(p->flags,kDeferFreeMmFl) == false)
rc = _cmMmFree(p,dataPtr,rp);
return rc;
}
void* _cmMmAllocate(cmMm_t* p, void* orgDataPtr, unsigned newByteCnt, unsigned flags )
{
unsigned abc = cmIsFlag(flags,kAlignMmFl) ? p->alignByteCnt : 0;
unsigned gbc = p->guardByteCnt;
char* bp = NULL;
char* dp = NULL;
char* idp = NULL;
unsigned orgByteCnt = 0;
unsigned prefixByteCnt = 0;
// Determine the total allocation block size including the auxillary data.
//
// alignment bytes + data_byte_cnt + guard bytes + actual data
unsigned ttlByteCnt = abc+sizeof(unsigned) + sizeof(unsigned) + (2*gbc) + newByteCnt;
// if this is a reallocation
if( orgDataPtr != NULL )
{
// asking to reallocate a block with zero bytes free's the original block and returns NULL
// (this is in keeping with realloc() behaviour)
if( newByteCnt == 0 )
{
_cmMmFreeP(p,orgDataPtr);
return NULL;
}
// get the size of the currently allocated block
orgByteCnt = _cmMmDataToByteCnt(orgDataPtr,gbc);
// if the requested data area is <= the alloc'd data area
if( newByteCnt <= orgByteCnt)
{
// if preservation was requested simply return with the original data area ptr
if( cmIsFlag(flags,kPreserveMmFl) )
return orgDataPtr;
// otherwise initialze the data area
dp = orgDataPtr;
goto initLabel;
}
// expansion was requested
}
// if an empty data area was requested
if( newByteCnt == 0 )
return NULL;
//
// A new data block must be allocated
//
// allocate the memory block via a callback
if((bp = p->allocFunc(p->funcArgPtr,ttlByteCnt)) == NULL )
{
cmErrMsg(&p->err,kAllocFailMmRC,"Attempt to allocate %i bytes failed.",ttlByteCnt);
goto errLabel;
}
// make the data area offset: data_byte_cnt + guard bytes
dp = bp + (2*sizeof(unsigned)) + gbc;
if( abc )
{
unsigned long alignMask = abc - 1;
// alignment requires an additional offset
dp += abc;
// align the data area to the specified boundary
char* ndp = ((char*)((unsigned long)dp & (~alignMask)));
prefixByteCnt = abc - (dp - ndp);
dp = ndp;
}
// set the prefix byteCnt
*(unsigned*)_cmMmDataToPrefixCntPtr(dp,gbc) = prefixByteCnt;
// set the data area byte cnt
*(unsigned*)_cmMmDataToByteCntPtr(dp,gbc) = newByteCnt;
// uncomment this line to print memory layout information for each block
//printf("prefix:%i prefix*:%p bytes:%i bytes*:%p base:%p==%p data:%p\n",_cmMmDataToPrefixCnt(dp,gbc),_cmMmDataToPrefixCntPtr(dp,gbc),_cmMmDataToByteCnt(dp,gbc),_cmMmDataToByteCntPtr(dp,gbc),_cmMmDataToBasePtr(dp,gbc),bp,dp);
// set the guard bytes
if( gbc )
{
void* gp = _cmMmDataToPreGuardPtr( dp,gbc);
if( gp != NULL )
memset(gp, p->guardChar, gbc);
gp = _cmMmDataToPostGuardPtr( dp,gbc);
if( gp != NULL )
memset(gp, p->guardChar, gbc);
}
initLabel:
//
// initialize the new data area
//
idp = dp;
// if this is a reallocation with expansion ...
if( orgDataPtr != NULL && newByteCnt > orgByteCnt )
{
// ... and preservation was requested
if( cmIsFlag(flags,kPreserveMmFl) )
{
// copy original data into the new block
memcpy(idp,orgDataPtr,orgByteCnt);
idp += orgByteCnt;
newByteCnt -= orgByteCnt;
}
_cmMmFreeP(p,orgDataPtr); // free the original data block
}
// if zeroing was requested
if( cmIsFlag(flags,kZeroMmFl))
memset(idp,0,newByteCnt);
else
// if uninitialized data should be set to a known character
if( cmIsFlag(p->flags,kFillUninitMmFl) )
memset(idp,p->uninitChar,newByteCnt);
return dp;
errLabel:
return NULL;
}
cmMmRC_t cmMmInitialize(
cmMmH_t* hp,
cmAllocMmFunc_t allocFunc,
cmFreeMmFunc_t freeFunc,
void* funcArgPtr,
unsigned guardByteCnt,
unsigned alignByteCnt,
unsigned flags,
cmRpt_t* rpt )
{
cmMm_t* p;
cmErr_t err;
cmErrSetup(&err,rpt,"Memory Manager");
// validate alignByteCnt
if(alignByteCnt>0 && cmIsPowerOfTwo(alignByteCnt)==false)
return cmErrMsg(&err,kParamErrMmRC,"The 'alignByteCnt' parameter must be a power of two.");
// allocate the main object
if((p= calloc(1,sizeof(cmMm_t))) == NULL )
return cmErrMsg(&err,kObjAllocFailMmRC,"Object allocation failed.");
// setting kDeferFreeMmFl only makes sense when kTrackMmFl is also set
if(cmIsFlag(flags,kTrackMmFl)==false && cmIsFlag(flags,kDeferFreeMmFl)==true)
{
cmErrMsg(&err,kParamErrMmRC,"The flag 'kDeferFreeMmFl' may only be set if the 'kTrackMmFl' is also set. 'kDeferFreeMmFl' is begin disabled.");
flags = cmClrFlag(flags,kDeferFreeMmFl);
}
cmErrClone(&p->err,&err);
p->rpt = rpt;
p->alignByteCnt = alignByteCnt;
p->guardByteCnt = guardByteCnt;
p->allocFunc = allocFunc;
p->freeFunc = freeFunc;
p->funcArgPtr = funcArgPtr;
p->uninitChar = 0x55; // non-zeroed data areas are automatically filled w/ this value on allocation
p->freeChar = 0x33; // data areas are overwritten with this value on free
p->guardChar = 0xAA; // guard areas are set with this value
p->flags = flags;
hp->h = p;
return kOkMmRC;
}
cmMmRC_t cmMmFinalize( cmMmH_t* hp )
{
cmMm_t* p;
cmMmRC_t rc = kOkMmRC;
if( hp == NULL || cmMmIsValid(*hp)==false )
return kOkMmRC;
p = _cmMmHandleToPtr(*hp);
cmMmRecd_t* rp = p->listPtr;
while( rp != NULL )
{
cmMmRecd_t* tp = rp->linkPtr;
cmMmRC_t rrc;
if( cmIsFlag(p->flags,kDeferFreeMmFl) )
if((rrc = _cmMmFree(p,rp->dataPtr,rp)) != kOkMmRC )
rc = rrc;
free(rp);
rp = tp;
}
free(p);
hp->h = NULL;
return rc;
}
unsigned cmMmGuardByteCount( cmMmH_t h )
{
cmMm_t* p = _cmMmHandleToPtr(h);
return p->guardByteCnt;
}
unsigned cmMmAlignByteCount( cmMmH_t h )
{
cmMm_t* p = _cmMmHandleToPtr(h);
return p->alignByteCnt;
}
unsigned cmMmInitializeFlags( cmMmH_t h )
{
cmMm_t* p = _cmMmHandleToPtr(h);
return p->flags;
}
bool cmMmIsValid( cmMmH_t h )
{ return h.h != NULL; }
void* cmMmAllocate(
cmMmH_t h,
void* orgDataPtr,
unsigned newEleCnt,
unsigned newEleByteCnt,
enum cmMmAllocFlags_t flags,
const char* fileName,
const char* funcName,
unsigned fileLine )
{
cmMm_t* p = _cmMmHandleToPtr(h);
unsigned newByteCnt = newEleCnt * newEleByteCnt;
void* ndp = _cmMmAllocate(p,orgDataPtr,newByteCnt,flags);
/*
if( p->nextId == 189114 )
{
cmErrMsg(&p->err,kOkMmRC,"Breakpoint for memory allocation id:%i.",p->nextId);
}
if( (long long)_cmMmDataToBasePtr(ndp,p->guardByteCnt) == 0x7fffed8d0b40 )
{
cmErrMsg(&p->err,kOkMmRC,"Breakpoint for memory allocation id:%i.",p->nextId);
}
*/
// if we are tracking changes
if( cmIsFlag(p->flags,kTrackMmFl) )
{
//
// NOTE: it is possible that ndp is NULL if newByteCnt == 0.
//
cmMmRecd_t* rp = NULL;
// if a new memory block was allocated
if( orgDataPtr == NULL || orgDataPtr != ndp )
{
// allocate a new tracking recd
if( (rp = calloc(1,sizeof(cmMmRecd_t))) == NULL )
{
cmErrMsg(&p->err,kTrkAllocFailMmRC,"Unable to allocate a tracking record for %s line:%i %s.",funcName,fileLine,fileName);
return ndp;
}
cmThUIntIncr(&p->nextId,1);
// initialize the new tracking recd
rp->dataPtr = ndp;
rp->dataByteCnt = newByteCnt;
rp->fileLine = fileLine;
rp->fileNameStr = fileName;
rp->funcNameStr = funcName;
rp->flags = 0;
rp->uniqueId = p->nextId;
cmMmRecd_t *oldp, *newp;
do
{
oldp = p->listPtr;
newp = rp;
rp->linkPtr = p->listPtr;
}while(!cmThPtrCAS(&p->listPtr,oldp,newp));
assert( _cmMmCheckGuards(p,rp) == kOkMmRC );
}
else // a reallocation occurred.
if( orgDataPtr == ndp )
{
if((rp = _cmMmFindRecd(p,orgDataPtr)) == NULL )
cmErrMsg(&p->err,kMissingRecdMmRC,"Unable to locate a tracking record associated with reallocation data area pointer:%p.",orgDataPtr);
}
}
return ndp;
}
cmMmRC_t cmMmFree( cmMmH_t h, void* dataPtr )
{
cmMm_t* p = _cmMmHandleToPtr(h);
return _cmMmFreeP(p,dataPtr);
}
cmMmRC_t cmMmFreeDebug( cmMmH_t h, void* dataPtr, const char* fileName, const char* funcName, unsigned fileLine )
{
cmMmRC_t rc;
if((rc = cmMmFree(h,dataPtr)) != kOkMmRC )
cmErrMsg(&_cmMmHandleToPtr(h)->err,rc,"Memory free failed at %s() line:%i %s",funcName,fileLine,fileName);
return rc;
}
cmMmRC_t cmMmFreePtr( cmMmH_t h, void** dataPtrPtr )
{
assert(dataPtrPtr != NULL );
cmMmRC_t rc = cmMmFree(h,*dataPtrPtr);
*dataPtrPtr = NULL;
return rc;
}
cmMmRC_t cmMmFreePtrDebug( cmMmH_t h, void* dataPtr, const char* fileName, const char* funcName, unsigned fileLine )
{
cmMmRC_t rc;
if((rc = cmMmFreePtr(h,dataPtr)) != kOkMmRC )
cmErrMsg(&_cmMmHandleToPtr(h)->err,rc,"Memory free failed at %s() line:%i %s",funcName,fileLine,fileName);
return rc;
}
unsigned cmMmByteCount( cmMmH_t h, const void* dataPtr )
{
cmMm_t* p = _cmMmHandleToPtr(h);
return _cmMmDataToByteCnt(dataPtr,p->guardByteCnt);
}
unsigned cmMmDebugId( cmMmH_t h, const void* dataPtr)
{
cmMm_t* p = _cmMmHandleToPtr(h);
const cmMmRecd_t* rp = NULL;
// if we are tracking alloc's and free's
if( cmIsFlag(p->flags,kTrackMmFl) )
{
// locate the tracking recd
rp = _cmMmFindRecd(p,dataPtr);
}
return rp==NULL ? cmInvalidId : rp->uniqueId;
}
cmMmRC_t _cmMmError( cmMm_t* p, cmMmRC_t rc, const cmMmRecd_t* rp, const char* msg )
{
return cmErrMsg(&p->err,rc,"%s detected on block id:%i from %s() line:%i %s.",msg,rp->uniqueId,rp->funcNameStr,rp->fileLine,rp->fileNameStr);
}
cmMmRC_t _cmMmRecdPrint( cmMm_t* p, cmMmRecd_t* rp, cmMmRC_t rc )
{
void* dp = rp->dataPtr;
unsigned gbc = p->guardByteCnt;
char* lbl = NULL;
switch( rc )
{
case kOkMmRC: lbl = "Ok "; break;
case kLeakDetectedMmRC: lbl = "Memory Leak "; break;
case kWriteAfterFreeMmRC: lbl = "Write After Free"; break;
case kDblFreeDetectedMmRC: lbl = "Double Free "; break;
case kGuardCorruptMmRC: lbl = "Guard Corrupt "; break;
default:
lbl = "Unknown Status ";
}
cmRptPrintf(p->err.rpt,"%s id:%5i data:%p : data:%5i prefix:%5i total:%5i base:%p : %5i %s %s\n",
lbl,rp->uniqueId,rp->dataPtr,
_cmMmDataToByteCnt(dp,gbc),
_cmMmDataToPrefixCnt(dp,gbc),
_cmMmDataToTotalByteCnt(dp,gbc),
_cmMmDataToBasePtr(dp,gbc),
rp->fileLine,rp->funcNameStr,rp->fileNameStr );
return rc;
}
cmMmRC_t cmMmReport( cmMmH_t h, unsigned flags )
{
cmMm_t* p = _cmMmHandleToPtr(h);
unsigned allocByteCnt = 0;
unsigned ttlByteCnt = 0;
unsigned dataFrByteCnt = 0;
unsigned ttlFrByteCnt = 0;
unsigned dataLkByteCnt = 0;
unsigned ttlLkByteCnt = 0;
unsigned allocBlkCnt = 0;
unsigned freeBlkCnt = 0;
unsigned leakBlkCnt = 0;
cmMmRecd_t* rp = p->listPtr;
cmMmRC_t ret_rc = kOkMmRC;
for(; rp != NULL; rp = rp->linkPtr,++allocBlkCnt )
{
cmMmRC_t rc = kOkMmRC;
unsigned blkDataByteCnt = _cmMmDataToByteCnt(rp->dataPtr,p->guardByteCnt);
unsigned blkTtlByteCnt = _cmMmDataToTotalByteCnt(rp->dataPtr,p->guardByteCnt);
allocByteCnt += blkDataByteCnt;
ttlByteCnt += blkTtlByteCnt;
// if this block was freed or never alloc'd
if( cmIsFlag(rp->flags,kFreedMmFl) || rp->dataPtr == NULL )
{
++freeBlkCnt;
dataFrByteCnt += blkDataByteCnt;
ttlFrByteCnt += blkTtlByteCnt;
}
else // if this block leaked
{
++leakBlkCnt;
dataLkByteCnt += blkDataByteCnt;
ttlLkByteCnt += blkTtlByteCnt;
if( cmIsFlag(flags,kIgnoreLeaksMmFl) == false )
rc = _cmMmRecdPrint(p,rp,kLeakDetectedMmRC);
}
// if this block was double freed
if( cmIsFlag(rp->flags,kDblFreeMmFl) )
rc = _cmMmRecdPrint(p,rp,kDblFreeDetectedMmRC);
// check for guard corruption and write-after-free
cmMmRC_t t_rc = _cmMmCheckGuards(p,rp);
switch( t_rc )
{
case kOkMmRC:
break;
case kGuardCorruptMmRC:
rc = _cmMmRecdPrint(p,rp,t_rc);
break;
case kWriteAfterFreeMmRC:
rc = _cmMmRecdPrint(p,rp,t_rc);
break;
default:
assert(0);
break;
}
if( rc != kOkMmRC )
ret_rc = rc;
else
{
if( cmIsFlag(flags,kIgnoreNormalMmFl)==false )
_cmMmRecdPrint(p,rp,rc);
}
}
if( p->listPtr != NULL && cmIsFlag(flags,kSuppressSummaryMmFl)==false )
{
cmRptPrintf(p->err.rpt,"Blocks Allocated:%i Freed:%i Leaked:%i\n",allocBlkCnt,freeBlkCnt,leakBlkCnt);
cmRptPrintf(p->err.rpt,"Bytes Allocated: data=%i total=%i Freed: data=%i total=%i Leaked: data=%i total=%i\n",allocByteCnt,ttlByteCnt,dataFrByteCnt,ttlFrByteCnt,dataLkByteCnt,ttlLkByteCnt);
}
return ret_rc;
}
cmMmRC_t cmMmIsGuardCorrupt( cmMmH_t h, unsigned id )
{
cmMm_t* p = _cmMmHandleToPtr(h);
cmMmRecd_t* rp = p->listPtr;
while(rp != NULL )
{
if( rp->uniqueId == id )
break;
rp = rp->linkPtr;
}
if( rp == NULL )
return cmErrMsg(&p->err,kMissingRecdMmRC,"Unable to locate the tracking record associated with id %i.",id);
return _cmMmCheckGuards(p,rp);
}
cmMmRC_t cmMmCheckAllGuards( cmMmH_t h )
{
cmMm_t* p = _cmMmHandleToPtr(h);
cmMmRecd_t* rp = p->listPtr;
cmMmRC_t rc = kOkMmRC;
while(rp != NULL )
{
if((rc = _cmMmCheckGuards(p,rp)) != kOkMmRC )
rc = cmErrMsg(&p->err,rc,"A corrupt guard or 'write after free' was detected in the data area allocated with id:%i at %s (line:%i) %s.",rp->uniqueId,rp->funcNameStr,rp->fileLine,rp->fileNameStr);
rp = rp->linkPtr;
}
return rc;
}
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