author | richk |
Tue, 17 Jun 2008 13:22:13 +0000 | |
branch | NewGRF_ports |
changeset 10994 | cd9968b6f96b |
parent 10274 | b3c58f3df92b |
permissions | -rw-r--r-- |
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/* $Id$ */ |
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/** @file alloc_func.hpp Functions related to the allocation of memory */ |
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#ifndef ALLOC_FUNC_HPP |
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#define ALLOC_FUNC_HPP |
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/** |
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* Functions to exit badly with an error message. |
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* It has to be linked so the error messages are not |
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* duplicated in each object file making the final |
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* binary needlessly large. |
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*/ |
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void NORETURN MallocError(size_t size); |
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void NORETURN ReallocError(size_t size); |
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/** |
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* Simplified allocation function that allocates the specified number of |
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* elements of the given type. It also explicitly casts it to the requested |
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* type. |
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* @note throws an error when there is no memory anymore. |
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* @note the memory contains garbage data (i.e. possibly non-zero values). |
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* @param T the type of the variable(s) to allocation. |
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* @param num_elements the number of elements to allocate of the given type. |
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* @return NULL when num_elements == 0, non-NULL otherwise. |
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*/ |
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template <typename T> FORCEINLINE T* MallocT(size_t num_elements) |
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{ |
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/* |
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* MorphOS cannot handle 0 elements allocations, or rather that always |
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* returns NULL. So we do that for *all* allocations, thus causing it |
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* to behave the same on all OSes. |
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*/ |
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if (num_elements == 0) return NULL; |
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T *t_ptr = (T*)malloc(num_elements * sizeof(T)); |
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if (t_ptr == NULL) MallocError(num_elements * sizeof(T)); |
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return t_ptr; |
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} |
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/** |
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* Simplified allocation function that allocates the specified number of |
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* elements of the given type. It also explicitly casts it to the requested |
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* type. |
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* @note throws an error when there is no memory anymore. |
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* @note the memory contains all zero values. |
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* @param T the type of the variable(s) to allocation. |
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* @param num_elements the number of elements to allocate of the given type. |
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* @return NULL when num_elements == 0, non-NULL otherwise. |
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*/ |
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template <typename T> FORCEINLINE T* CallocT(size_t num_elements) |
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{ |
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/* |
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* MorphOS cannot handle 0 elements allocations, or rather that always |
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* returns NULL. So we do that for *all* allocations, thus causing it |
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* to behave the same on all OSes. |
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*/ |
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if (num_elements == 0) return NULL; |
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T *t_ptr = (T*)calloc(num_elements, sizeof(T)); |
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if (t_ptr == NULL) MallocError(num_elements * sizeof(T)); |
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return t_ptr; |
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} |
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/** |
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* Simplified reallocation function that allocates the specified number of |
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* elements of the given type. It also explicitly casts it to the requested |
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* type. It extends/shrinks the memory allocation given in t_ptr. |
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* @note throws an error when there is no memory anymore. |
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* @note the memory contains all zero values. |
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* @param T the type of the variable(s) to allocation. |
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* @param t_ptr the previous allocation to extend/shrink. |
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* @param num_elements the number of elements to allocate of the given type. |
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* @return NULL when num_elements == 0, non-NULL otherwise. |
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*/ |
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template <typename T> FORCEINLINE T* ReallocT(T *t_ptr, size_t num_elements) |
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{ |
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/* |
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* MorphOS cannot handle 0 elements allocations, or rather that always |
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* returns NULL. So we do that for *all* allocations, thus causing it |
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* to behave the same on all OSes. |
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*/ |
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if (num_elements == 0) { |
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free(t_ptr); |
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return NULL; |
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} |
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t_ptr = (T*)realloc(t_ptr, num_elements * sizeof(T)); |
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if (t_ptr == NULL) ReallocError(num_elements * sizeof(T)); |
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return t_ptr; |
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} |
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/** alloca() has to be called in the parent function, so define AllocaM() as a macro */ |
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#define AllocaM(T, num_elements) ((T*)alloca((num_elements) * sizeof(T))) |
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#endif /* ALLOC_FUNC_HPP */ |