//
// Memory allocators for CssmHeap objects.
// This implementation stores a pointer to the allocator used into memory
// *after* the object's proper storage block. This allows the usual free()
// functions to safely free our (hidden) pointer without knowing about it.
// An allocator argument of NULL is interpreted as the standard allocator.
//
void *CssmHeap::operator new (size_t size, Allocator *alloc) throw(std::bad_alloc)
{
if (alloc == NULL)
alloc = &Allocator::standard();
size = alignUp(size, alignof_template<Allocator *>());
size_t totalSize = size + sizeof(Allocator *);
void *addr = alloc->malloc(totalSize);
*(Allocator **)increment(addr, size) = alloc;
return addr;
}
void CssmHeap::operator delete (void *addr, size_t size) throw()
{
void *end = increment(addr, alignUp(size, alignof_template<Allocator *>()));
(*(Allocator **)end)->free(addr);
}