52 lines
1.8 KiB
C
52 lines
1.8 KiB
C
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#ifndef VTR_MEMORY_H
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#define VTR_MEMORY_H
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#include <cstddef>
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namespace vtr {
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struct t_linked_vptr; //Forward declaration
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/* This structure is to keep track of chunks of memory that is being *
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* allocated to save overhead when allocating very small memory pieces. *
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* For a complete description, please see the comment in chunk_malloc*/
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struct t_chunk {
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t_linked_vptr *chunk_ptr_head = nullptr;
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/* chunk_ptr_head->data_vptr: head of the entire linked
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* list of allocated "chunk" memory;
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* chunk_ptr_head->next: pointer to the next chunk on the linked list*/
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int mem_avail = 0; /* number of bytes left in the current chunk */
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char *next_mem_loc_ptr = nullptr;/* pointer to the first available (free) *
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* byte in the current chunk */
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};
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void* free(void *some);
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void* calloc(size_t nelem, size_t size);
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void* malloc(size_t size);
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void* realloc(void *ptr, size_t size);
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void* chunk_malloc(size_t size, t_chunk *chunk_info);
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void free_chunk_memory(t_chunk *chunk_info);
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//Like chunk_malloc, but with proper C++ object initialization
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template<typename T>
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T* chunk_new(t_chunk *chunk_info) {
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void* block = chunk_malloc(sizeof(T), chunk_info);
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return new (block) T(); //Placement new
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}
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//Call the destructor of an obj which must have been allocated in the specified chunk
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template<typename T>
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void chunk_delete(T* obj, t_chunk * /*chunk_info*/) {
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if (obj) {
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obj->~T(); //Manually call destructor
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//Currently we don't mark the unused memory as free
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}
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}
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//Cross platform wrapper around GNU's malloc_trim()
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// TODO: This is only used in one place within VPR, consider removing it
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int malloc_trim(size_t pad);
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}
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#endif
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