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macros: add wrappers for more GCC/Clang attributes/pragmas/builtins

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This commit is contained in:
Craig Barnes 2021-01-03 08:47:12 +00:00
parent 5cc2f94668
commit 2559a9711c
1 changed files with 70 additions and 7 deletions
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77
macros.h
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@ -1,5 +1,6 @@
#pragma once
#define DO_PRAGMA(x) _Pragma(#x)
#define VERCMP(x, y, cx, cy) ((cx > x) || ((cx == x) && (cy >= y)))
#if defined(__GNUC__) && defined(__GNUC_MINOR__)
@ -8,6 +9,12 @@
#define GNUC_AT_LEAST(x, y) 0
#endif
#if defined(__clang_major__) && defined(__clang_minor__)
#define CLANG_AT_LEAST(x, y) VERCMP(x, y, __clang_major__, __clang_minor__)
#else
#define CLANG_AT_LEAST(x, y) 0
#endif
#ifdef __has_attribute
#define HAS_ATTRIBUTE(x) __has_attribute(x)
#else
@ -26,13 +33,7 @@
#define UNUSED
#endif
#if HAS_ATTRIBUTE(noinline)
#define NOINLINE __attribute__((noinline))
#else
#define NOINLINE
#endif
#if HAS_ATTRIBUTE(const)
#if GNUC_AT_LEAST(3, 0) || HAS_ATTRIBUTE(const)
#define CONST __attribute__((__const__))
#else
#define CONST
@ -60,6 +61,18 @@
#define unlikely(x) (x)
#endif
#if GNUC_AT_LEAST(3, 1) || HAS_ATTRIBUTE(noinline)
#define NOINLINE __attribute__((__noinline__))
#else
#define NOINLINE
#endif
#if GNUC_AT_LEAST(3, 1) || HAS_ATTRIBUTE(always_inline)
#define ALWAYS_INLINE __attribute__((__always_inline__))
#else
#define ALWAYS_INLINE
#endif
#if GNUC_AT_LEAST(3, 3) || HAS_ATTRIBUTE(nonnull)
#define NONNULL_ARGS __attribute__((__nonnull__))
#define NONNULL_ARG(...) __attribute__((__nonnull__(__VA_ARGS__)))
@ -74,18 +87,42 @@
#define WARN_UNUSED_RESULT
#endif
#if GNUC_AT_LEAST(4, 1) || HAS_ATTRIBUTE(flatten)
#define FLATTEN __attribute__((__flatten__))
#else
#define FLATTEN
#endif
#if GNUC_AT_LEAST(4, 3) || HAS_ATTRIBUTE(hot)
#define HOT __attribute__((__hot__))
#else
#define HOT
#endif
#if GNUC_AT_LEAST(4, 3) || HAS_ATTRIBUTE(cold)
#define COLD __attribute__((__cold__))
#else
#define COLD
#endif
#if GNUC_AT_LEAST(4, 5) || HAS_BUILTIN(__builtin_unreachable)
#define UNREACHABLE() __builtin_unreachable()
#else
#define UNREACHABLE()
#endif
#if GNUC_AT_LEAST(5, 0) || HAS_ATTRIBUTE(returns_nonnull)
#define RETURNS_NONNULL __attribute__((__returns_nonnull__))
#else
#define RETURNS_NONNULL
#endif
#if HAS_ATTRIBUTE(diagnose_if)
#define DIAGNOSE_IF(x) __attribute__((diagnose_if((x), (#x), "error")))
#else
#define DIAGNOSE_IF(x)
#endif
#define XMALLOC MALLOC RETURNS_NONNULL WARN_UNUSED_RESULT
#define XSTRDUP XMALLOC NONNULL_ARGS
@ -96,3 +133,29 @@
#else
#define NORETURN
#endif
#if CLANG_AT_LEAST(3, 6)
#define UNROLL_LOOP(n) DO_PRAGMA(clang loop unroll_count(n))
#elif GNUC_AT_LEAST(8, 0)
#define UNROLL_LOOP(n) DO_PRAGMA(GCC unroll (n))
#else
#define UNROLL_LOOP(n)
#endif
#ifdef __clang__
#define IGNORE_WARNING(wflag) \
DO_PRAGMA(clang diagnostic push) \
DO_PRAGMA(clang diagnostic ignored "-Wunknown-pragmas") \
DO_PRAGMA(clang diagnostic ignored "-Wunknown-warning-option") \
DO_PRAGMA(clang diagnostic ignored wflag)
#define UNIGNORE_WARNINGS DO_PRAGMA(clang diagnostic pop)
#elif GNUC_AT_LEAST(4, 6)
#define IGNORE_WARNING(wflag) \
DO_PRAGMA(GCC diagnostic push) \
DO_PRAGMA(GCC diagnostic ignored "-Wpragmas") \
DO_PRAGMA(GCC diagnostic ignored wflag)
#define UNIGNORE_WARNINGS DO_PRAGMA(GCC diagnostic pop)
#else
#define IGNORE_WARNING(wflag)
#define UNIGNORE_WARNINGS
#endif