windows-server-2003/base/crts/crtw32/heap/new.cpp

/***
*new.cxx - defines C++ new routine
*
*       Copyright (c) 1990-2001, Microsoft Corporation.  All rights reserved.
*
*Purpose:
*       Defines C++ new routine.
*
*Revision History:
*       05-07-90  WAJ   Initial version.
*       08-30-90  WAJ   new now takes unsigned ints.
*       08-08-91  JCR   call _halloc/_hfree, not halloc/hfree
*       08-13-91  KRS   Change new.hxx to new.h.  Fix copyright.
*       08-13-91  JCR   ANSI-compatible _set_new_handler names
*       10-30-91  JCR   Split new, delete, and handler into seperate sources
*       11-13-91  JCR   32-bit version
*       02-16-94  SKS   Move set_new_handler functionality here from malloc()
*       03-01-94  SKS   _pnhHeap must be declared in malloc.c, not here
*       03-03-94  SKS   New handler functionality moved to malloc.c but under
*                       a new name, _nh_malloc().
*       02-01-95  GJF   #ifdef out the change above for the Mac (temporary).
*       05-01-95  GJF   Spliced on winheap version.
*       05-08-95  CFW   Turn on new handling for Mac.
*       05-22-98  JWM   Support for KFrei's RTC work, and operator new[].
*       07-28-98  JWM   RTC update.
*       11-04-98  JWM   Split off new[] to new2.cpp for better granularity.
*       12-18-98  GJF   Changes for 64-bit size_t.
*       05-26-99  KBF   Updated RTC hook func params
*       02-20-02  BWT   Reduce the call frame by calling heap_alloc directly (better DW traces)
*
*******************************************************************************/


#include <cruntime.h>
#include <malloc.h>
#include <new.h>
#include <stdlib.h>
#include <winheap.h>
#include <rtcsup.h>
#include <internal.h>

void * operator new( size_t cb )
{
    void *res;

    //  validate size
    if (cb > _HEAP_MAXREQ)
        res = NULL;
    else {
        for (;;) {
    
            //  allocate memory block
            res = _heap_alloc(cb);
    
            //  if successful allocation, return pointer to memory
    
            if (res)
                break;
    
            //  call installed new handler
            if (!_callnewh(cb))
                break;
    
            //  new handler was successful -- try to allocate again
        }
    }

    RTCCALLBACK(_RTC_Allocate_hook, (res, cb, 0));

    return res;
}