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|
/*
* Copyright © 2001 Novell, Inc. All Rights Reserved.
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/
/*
* FILENAME : NWVMem.h
* DESCRIPTION : Memory management for Perl Interpreter on NetWare.
* Watcom's hash table is used to store memory pointers.
* All malloc's, realloc's, free's go through this.
* Author : HYAK, SGP
* Date : January 2001.
*
*/
#ifndef ___NWVMEM_H_INC___
#define ___NWVMEM_H_INC___
#include "win32ish.h" // For "BOOL", "TRUE" and "FALSE"
#include <nwhashcls.h> // CW changes
#include <nwmalloc.h>
#include "string.h"
class VMem
{
public:
VMem();
virtual ~VMem();
virtual void* Malloc(size_t size);
virtual void* Realloc(void* pMem, size_t size);
virtual void Free(void* pMem);
virtual void* Calloc(size_t num, size_t size);
protected:
BOOL m_dontTouchHashLists;
// WCValHashTable<void*>* m_allocList;
NWPerlHashList *m_allocList; // CW changes
};
/*============================================================================================
Function : fnAllocListHash
Description : Hashing function for hash table of memory allocations.
Parameters : invalue (IN).
Returns : unsigned.
==============================================================================================*/
unsigned fnAllocListHash(void* const& invalue)
{
return (((unsigned) invalue & 0x0000ff00) >> 8);
}
/*============================================================================================
Function : fnFreeMemEntry
Description : Called for each outstanding memory allocation at the end of a script run.
Frees the outstanding allocations
Parameters : ptr (IN).
context (IN)
Returns : Nothing.
==============================================================================================*/
void fnFreeMemEntry(void* ptr, void* context)
{
VMem* pVMem = (VMem*) context;
if(ptr && pVMem)
{
pVMem->Free(ptr);
ptr=NULL;
pVMem = NULL;
context = NULL;
}
}
/*============================================================================================
Function : VMem Constructor
Description :
Parameters :
Returns :
==============================================================================================*/
VMem::VMem()
{
//Constructor
m_dontTouchHashLists = FALSE;
m_allocList = NULL;
// m_allocList = new WCValHashTable<void*> (fnAllocListHash, 256);
m_allocList = new NWPerlHashList(); // CW changes
}
/*============================================================================================
Function : VMem Destructor
Description :
Parameters :
Returns :
==============================================================================================*/
VMem::~VMem(void)
{
//Destructor
m_dontTouchHashLists = TRUE;
if (m_allocList)
{
m_allocList->forAll(fnFreeMemEntry, (void*) this);
delete m_allocList;
m_allocList = NULL;
}
m_dontTouchHashLists = FALSE;
}
/*============================================================================================
Function : VMem::Malloc
Description : Allocates memory.
Parameters : size (IN) - Size of memory to be allocated.
Returns : Pointer to the allocated memory block.
==============================================================================================*/
void* VMem::Malloc(size_t size)
{
void *ptr = NULL;
if (size <= 0)
return NULL;
ptr = malloc(size);
if (ptr)
{
if(m_allocList)
m_allocList->insert(ptr);
}
else
{
m_dontTouchHashLists = TRUE;
if (m_allocList)
{
m_allocList->forAll(fnFreeMemEntry, (void*) this);
delete m_allocList;
m_allocList = NULL;
}
m_dontTouchHashLists = FALSE;
// Serious error since memory allocation falied. So, exiting...
ExitThread(TSR_THREAD, 1);
}
return(ptr);
}
/*============================================================================================
Function : VMem::Realloc
Description : Reallocates block of memory.
Parameters : block (IN) - Points to a previously allocated memory block.
size (IN) - Size of memory to be allocated.
Returns : Pointer to the allocated memory block.
==============================================================================================*/
void* VMem::Realloc(void* block, size_t size)
{
void *ptr = NULL;
if (size <= 0)
return NULL;
ptr = realloc(block, size);
if (ptr)
{
if (block)
{
if (m_allocList)
m_allocList->remove(block);
}
if (m_allocList)
m_allocList->insert(ptr);
}
else
{
m_dontTouchHashLists = TRUE;
if (m_allocList)
{
m_allocList->forAll(fnFreeMemEntry, (void*) this);
delete m_allocList;
m_allocList = NULL;
}
m_dontTouchHashLists = FALSE;
// Serious error since memory allocation falied. So, exiting...
ExitThread(TSR_THREAD, 1);
}
return(ptr);
}
/*============================================================================================
Function : VMem::Calloc
Description : Allocates and clears memory space for an array of objects.
Parameters : num (IN) - Specifies the number of objects.
size (IN) - Size of each object.
Returns : Pointer to the allocated memory block.
==============================================================================================*/
void* VMem::Calloc(size_t num, size_t size)
{
void *ptr = NULL;
if (size <= 0)
return NULL;
ptr = calloc(num, size);
if (ptr)
{
if(m_allocList)
m_allocList->insert(ptr);
}
else
{
m_dontTouchHashLists = TRUE;
if (m_allocList)
{
m_allocList->forAll(fnFreeMemEntry, (void*) this);
delete m_allocList;
m_allocList = NULL;
}
m_dontTouchHashLists = FALSE;
// Serious error since memory allocation falied. So, exiting...
ExitThread(TSR_THREAD, 1);
}
return(ptr);
}
/*============================================================================================
Function : VMem::Free
Description : Frees allocated memory.
Parameters : p (IN) - Points to the allocated memory.
Returns : Nothing.
==============================================================================================*/
void VMem::Free(void* p)
{
// Final clean up, free all the nodes from the hash list
if (m_dontTouchHashLists)
{
if(p)
{
free(p);
p = NULL;
}
}
else
{
if(p && m_allocList)
{
if (m_allocList->remove(p))
{
free(p);
p = NULL;
}
else
{
// If it comes here, that means that the memory pointer is not contained in the hash list.
// But no need to free now, since if is deleted here, it will result in an abend!!
// If the memory is still there, it will be cleaned during final cleanup anyway.
}
}
}
return;
}
#endif //___NWVMEM_H_INC___
|
