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ARRAY_SIZE: check that argument is an array
It's a familiar pattern: some code uses ARRAY_SIZE, then refactoring changes the argument from an array to a pointer to a dynamically allocated buffer. Code keeps compiling but any ARRAY_SIZE calls now return the size of the pointer divided by element size. Let's add build time checks to ARRAY_SIZE before we allow more of these in the code-base. Backports commit ed63ec0d22ccdce3b2222d9a514423b7fbba3a0d from qemu
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@ -184,8 +184,20 @@
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#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
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#endif
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#ifdef _MSC_VER
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#define QEMU_IS_ARRAY(x) (x)
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#else
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/*
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* &(x)[0] is always a pointer - if it's same type as x then the argument is a
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* pointer, not an array.
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*/
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#define QEMU_IS_ARRAY(x) (!__builtin_types_compatible_p(typeof(x), \
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typeof(&(x)[0])))
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#endif
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#ifndef ARRAY_SIZE
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#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
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#define ARRAY_SIZE(x) ((sizeof(x) / sizeof((x)[0])) + \
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QEMU_BUILD_BUG_ON_ZERO(!QEMU_IS_ARRAY(x)))
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#endif
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void *qemu_try_memalign(size_t alignment, size_t size);
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