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Location: cpp/openttd-patchpack/source/src/core/alloc_type.hpp - annotation
r10554:611efc1f7583
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(svn r14811) -Fix: off-by-one causing possible out-of-bounds reads.
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/** @file alloc_type.hpp Helper types related to the allocation of memory */
#ifndef ALLOC_TYPE_HPP
#define ALLOC_TYPE_HPP
#include "alloc_func.hpp"
/**
* A small 'wrapper' for allocations that can be done on most OSes on the
* stack, but are just too large to fit in the stack on devices with a small
* stack such as the NDS.
* So when it is possible a stack allocation is made, otherwise a heap
* allocation is made and this is freed once the struct goes out of scope.
* @param T the type to make the allocation for
* @param length the amount of items to allocate
*/
template <typename T, size_t length>
struct SmallStackSafeStackAlloc {
#if !defined(__NDS__)
/** Storing the data on the stack */
T data[length];
#else
/** Storing it on the heap */
T *data;
/** The length (in elements) of data in this allocator. */
size_t len;
/** Allocating the memory */
SmallStackSafeStackAlloc() : data(MallocT<T>(length)), len(length) {}
/** And freeing when it goes out of scope */
~SmallStackSafeStackAlloc()
{
free(data);
}
#endif
/**
* Gets a pointer to the data stored in this wrapper.
* @return the pointer.
*/
FORCEINLINE operator T* ()
{
return data;
}
/**
* Gets a pointer to the data stored in this wrapper.
* @return the pointer.
*/
FORCEINLINE T* operator -> ()
{
return data;
}
/**
* Gets a pointer to the last data element stored in this wrapper.
* @note needed because endof does not work properly for pointers.
* @return the 'endof' pointer.
*/
FORCEINLINE T* EndOf()
{
#if !defined(__NDS__)
return endof(data);
#else
return &data[len];
#endif
}
};
/**
* Base class that provides memory initialization on dynamically created objects.
* All allocated memory will be zeroed.
*/
class ZeroedMemoryAllocator
{
public:
ZeroedMemoryAllocator() {}
virtual ~ZeroedMemoryAllocator() {}
/**
* Memory allocator for a single class instance.
* @param size the amount of bytes to allocate.
* @return the given amounts of bytes zeroed.
*/
FORCEINLINE void *operator new(size_t size) { return CallocT<byte>(size); }
/**
* Memory allocator for an array of class instances.
* @param size the amount of bytes to allocate.
* @return the given amounts of bytes zeroed.
*/
FORCEINLINE void *operator new[](size_t size) { return CallocT<byte>(size); }
/**
* Memory release for a single class instance.
* @param ptr the memory to free.
* @param size the amount of allocated memory (unused).
*
* @warning The value of the \a size parameter can only be trusted for
* classes that have their own (virtual) destructor method.
*/
FORCEINLINE void operator delete(void *ptr, size_t size) { free(ptr); }
/**
* Memory release for an array of class instances.
* @param ptr the memory to free.
* @param size the amount of allocated memory (unused).
*
* @warning The value of the \a size parameter can only be trusted for
* classes that have their own (virtual) destructor method.
*/
FORCEINLINE void operator delete[](void *ptr, size_t size) { free(ptr); }
};
#endif /* ALLOC_TYPE_HPP */
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