From dc8e8b07bdf1baa52dc5c1bd1ea4dd839aa6cb55 Mon Sep 17 00:00:00 2001 From: Gerd Moellmann Date: Sat, 6 Oct 2001 23:25:06 +0000 Subject: [PATCH] (MOST_NEGATIVE_FIXNUM, MOST_POSITIVE_FIXNUM) (FIXNUM_OVERFLOW_P): New macros. --- src/lisp.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/src/lisp.h b/src/lisp.h index e7de504f464..2080cf6b4e2 100644 --- a/src/lisp.h +++ b/src/lisp.h @@ -387,6 +387,10 @@ extern size_t pure_size; #define make_number(N) \ ((((EMACS_INT) (N)) & VALMASK) | ((EMACS_INT) Lisp_Int) << VALBITS) +#define make_fixnum(x) make_number (x) +#define MOST_NEGATIVE_FIXNUM ((EMACS_INT) 1 << (VALBITS - 1)) +#define MOST_POSITIVE_FIXNUM (MOST_NEGATIVE_FIXNUM - 1) + /* During garbage collection, XGCTYPE must be used for extracting types so that the mark bit is ignored. XMARKBIT accesses the markbit. Markbits are used only in particular slots of particular structure types. @@ -468,6 +472,16 @@ extern Lisp_Object make_number (); #endif /* NO_UNION_TYPE */ +/* Largest and smallest representable fixnum values. */ + +#define MOST_NEGATIVE_FIXNUM ((EMACS_INT) 1 << (VALBITS - 1)) +#define MOST_POSITIVE_FIXNUM (MOST_NEGATIVE_FIXNUM - 1) + +/* Value is non-zero if C integer I doesn't fit into a Lisp fixnum. */ + +#define FIXNUM_OVERFLOW_P(i) \ + ((i) > MOST_POSITIVE_FIXNUM || (i) < MOST_NEGATIVE_FIXNUM) + /* Extract a value or address from a Lisp_Object. */ #define XCONS(a) (eassert (GC_CONSP(a)),(struct Lisp_Cons *) XPNTR(a)) -- 2.39.2