From 86bdf117148388a39f5d0c24e5259314f3e29fb5 Mon Sep 17 00:00:00 2001 From: Thomas Haller Date: Mon, 5 Dec 2022 23:11:13 +0100 Subject: fundamental: add CAST_ALIGN_PTR() macro --- src/fundamental/macro-fundamental.h | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/src/fundamental/macro-fundamental.h b/src/fundamental/macro-fundamental.h index 65c9e042cd..db778c7609 100644 --- a/src/fundamental/macro-fundamental.h +++ b/src/fundamental/macro-fundamental.h @@ -354,6 +354,16 @@ static inline size_t ALIGN_TO(size_t l, size_t ali) { ((l) + (ali) - 1) & ~((ali) - 1), \ VOID_0) +/* Similar to ((t *) (void *) (p)) to cast a pointer. The macro asserts that the pointer has a suitable + * alignment for type "t". This exists for places where otherwise "-Wcast-align=strict" would issue a + * warning or if you want to assert that the cast gives a pointer of suitable alignment. */ +#define CAST_ALIGN_PTR(t, p) \ + ({ \ + const void *_p = (p); \ + assert(((uintptr_t) _p) % __alignof__(t) == 0); \ + (t *) _p; \ + }) + #define UPDATE_FLAG(orig, flag, b) \ ((b) ? ((orig) | (flag)) : ((orig) & ~(flag))) #define SET_FLAG(v, flag, b) \ -- cgit v1.2.1