Laria Carolin Chabowski
ebf3fc89ff
We now no longer call malloc/free/... directly, but use an allocator object that is passed around. This was mainly done as a preparation for a garbage collector: The collector will need to know, how much memory we're using, introducing the collector abstraction will allow the GC to hook into the memory allocation and observe the memory usage. This has other potential applications: - We could now be embedded into applications that can't use the libc allocator. - There could be an allocator that limits the total amount of used memory, e.g. for sandboxing purposes. - In our tests we could use this to simulate out of memory conditions (implement an allocator that fails at the n-th allocation, increase n by one and restart the test until there are no more faked OOM conditions). The function signature of the allocator is basically exactly the same as the one Lua uses.
29 lines
807 B
C
29 lines
807 B
C
#ifndef APFL_ALLOC_H
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#define APFL_ALLOC_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stddef.h>
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#define ALLOCATOR_CALL(a, oldptr, oldsize, newsize) \
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((a).alloc((a).opaque, (oldptr), (oldsize), (newsize)))
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#define ALLOC_BYTES(a, n) (((n) == 0) ? NULL : ALLOCATOR_CALL(a, NULL, 0, (n)))
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#define REALLOC_BYTES(a, ptr, old, new) ALLOCATOR_CALL(a, ptr, old, new)
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#define FREE_BYTES(a, ptr, n) ALLOCATOR_CALL(a, ptr, n, 0)
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#define REALLOC_LIST(a, ptr, old, new) REALLOC_BYTES(a, ptr, sizeof(*ptr) * (old), sizeof(*ptr) * (new))
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#define ALLOC_LIST(a, T, len) (T *)ALLOC_BYTES(a, sizeof(T) * (len))
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#define FREE_LIST(a, ptr, len) FREE_BYTES(a, ptr, sizeof(*ptr) * (len))
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#define ALLOC_OBJ(a, T) ALLOC_LIST(a, T, 1)
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#define FREE_OBJ(a, ptr) FREE_LIST(a, ptr, 1)
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#ifdef __cplusplus
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}
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#endif
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#endif
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