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fast-export: avoid NULL pointer arithmetic
Clang 6 reports the following warning, which is turned into an error in a DEVELOPER build: builtin/fast-export.c:162:28: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic] return ((uint32_t *)NULL) + mark; ~~~~~~~~~~~~~~~~~~ ^ 1 error generated. The compiler is correct, and the error message speaks for itself. There is no need for any undefined operation -- just cast mark to void * or uint32_t after an intermediate cast to uintptr_t. That encodes the integer value into a pointer and later decodes it as intended. While at it remove an outdated comment -- intptr_t has been used since ffe659f94d (parse-options: make some arguments optional, add callbacks), committed in October 2007. Signed-off-by: Rene Scharfe <l.s.r@web.de> Acked-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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@ -154,15 +154,14 @@ static void anonymize_path(struct strbuf *out, const char *path,
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/* Since intptr_t is C99, we do not use it here */
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static inline void *mark_to_ptr(uint32_t mark)
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static inline uint32_t *mark_to_ptr(uint32_t mark)
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{
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{
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return ((uint32_t *)NULL) + mark;
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return (void *)(uintptr_t)mark;
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}
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}
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static inline uint32_t ptr_to_mark(void * mark)
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static inline uint32_t ptr_to_mark(void * mark)
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{
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{
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return (uint32_t *)mark - (uint32_t *)NULL;
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return (uint32_t)(uintptr_t)mark;
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}
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}
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static inline void mark_object(struct object *object, uint32_t mark)
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static inline void mark_object(struct object *object, uint32_t mark)
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