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86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
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#ifndef COMPILER_H
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#define COMPILER_H
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include "config.h"
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#if HAVE_UNALIGNED_ACCESS
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#define alignment_ok(p, n) 1
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#else
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#define alignment_ok(p, n) ((size_t)(p) % (n) == 0)
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#endif
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#define UNUSED __attribute__((__unused__))
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/**
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* BUILD_ASSERT - assert a build-time dependency.
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* @cond: the compile-time condition which must be true.
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*
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* Your compile will fail if the condition isn't true, or can't be evaluated
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* by the compiler. This can only be used within a function.
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*
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* Example:
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* #include <stddef.h>
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* ...
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* static char *foo_to_char(struct foo *foo)
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* {
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* // This code needs string to be at start of foo.
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* BUILD_ASSERT(offsetof(struct foo, string) == 0);
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* return (char *)foo;
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* }
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*/
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#define BUILD_ASSERT(cond) \
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do { (void) sizeof(char [1 - 2*!(cond)]); } while(0)
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/**
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* BUILD_ASSERT_OR_ZERO - assert a build-time dependency, as an expression.
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* @cond: the compile-time condition which must be true.
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*
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* Your compile will fail if the condition isn't true, or can't be evaluated
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* by the compiler. This can be used in an expression: its value is "0".
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*
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* Example:
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* #define foo_to_char(foo) \
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* ((char *)(foo) \
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* + BUILD_ASSERT_OR_ZERO(offsetof(struct foo, string) == 0))
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*/
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#define BUILD_ASSERT_OR_ZERO(cond) \
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(sizeof(char [1 - 2*!(cond)]) - 1)
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#define memclear(mem, size) memset(mem, 0, size)
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#define memclear_2(m1, s1, m2, s2) { memclear(m1, s1); memclear(m2, s2); }
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#define memclear_3(m1, s1, m2, s2, m3, s3) { memclear(m1, s1); memclear(m2, s2); memclear(m3, s3); }
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static inline void *memcheck_(const void *data, size_t len)
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{
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(void)len;
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return (void *)data;
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}
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#if HAVE_TYPEOF
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/**
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* memcheck - check that a memory region is initialized
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* @data: start of region
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* @len: length in bytes
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*
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* When running under valgrind, this causes an error to be printed
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* if the entire region is not defined. Otherwise valgrind only
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* reports an error when an undefined value is used for a branch, or
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* written out.
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*
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* Example:
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* // Search for space, but make sure it's all initialized.
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* if (memchr(memcheck(somebytes, bytes_len), ' ', bytes_len)) {
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* printf("space was found!\n");
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* }
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*/
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#define memcheck(data, len) ((__typeof__((data)+0))memcheck_((data), (len)))
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#else
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#define memcheck(data, len) memcheck_((data), (len))
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#endif
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#endif /* COMPILER_H */
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