root/software/fss-parallel-tools/common/simplest-defs.h @ 191d89ea
| 7e8045d8 | David Sorber | #ifndef __SIMPLEST_DEFS_H__
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#define __SIMPLEST_DEFS_H__
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#include <stddef.h>
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#include <stdint.h>
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#include "sparse.h"
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/* FIXME [matteof 2017-06-16] The name of this type is wrong. */
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/* BOOLINT intends to provide a type that can be stored in
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structs without worrying about alignment, and is compatible
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with C's rules, so that
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boolint foo = (1 != 0);
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foo && (...)
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work.
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*/
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typedef ptrdiff_t boolint;
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#define FMTboolint "%td"
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#if defined(__clang__)
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#define __enum64
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#define ENUM_AS_UINT64(e) uint64_t
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#else
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#define __enum64 __attribute__((mode(DI)))
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#define ENUM_AS_UINT64(e) e
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#endif
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#define UNUSED(x) ((void)(x))
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#define STATIC_ASSERT(truth) \
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extern char \
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(*static_assert_test_array__(void))[sizeof(char[(2 * !!(truth)) - 1])]
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// See
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// https://gcc.gnu.org/onlinedocs/gcc-4.7.0/cpp/Stringification.html
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// for an explanation of why the extra level of macro expansion might
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// be needed.
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//
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#define STRINGIFY(x) #x
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#define XSTRINGIFY(x) STRINGIFY(x)
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#define SAME_TYPE(a, b) (__builtin_types_compatible_p(typeof(a), typeof(b)))
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#define POINTER_IS_ARRAY(a) (!SAME_TYPE((a), &(a)[0]))
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// Statically calculate size of array
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// Provide compile error if
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// - a is not a pointer
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// - a is not an array (e.g. regular pointer, "array" function parameter)
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// Casting to ssize_t is necessary because y and z in (x?y:z) need to be the
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// same type and we need the -1 to get the compile error
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//
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// ({STATIC_ASSERT(POINTER_IS_ARRAY(a)); sizeof(a)/sizeof((a)[0]);})
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// does not work because our STATIC_ASSERT is not smart enough to be nested
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// (NELEM is often used inside STATIC_ASSERT)
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//
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// The type of X in char[X] should be ptrdiff_t, but we want to avoid forcing
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// the gratuitous inclusion of <stddef.h>. "long" is good enough for the
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// purpose.
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//
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#define NELEM(a) \
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(sizeof(char[POINTER_IS_ARRAY(a) ? \
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(__force long)(sizeof(a) / sizeof((a)[0])) : \
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(long)-1]))
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#endif // !__SIMPLEST_DEFS_H__
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