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/*
* Oracle Linux DTrace.
* Copyright (c) 2011, 2024, Oracle and/or its affiliates. All rights reserved.
* Licensed under the Universal Permissive License v 1.0 as shown at
* http://oss.oracle.com/licenses/upl.
*/
#ifndef _SYS_COMPILER_H
#define _SYS_COMPILER_H
/*
* Attributes that vary on a compiler-by-compiler basis.
*/
#if defined (__GNUC__)
/*
* GCC. We assume that all compilers claiming to be GCC support sufficiently
* many GCC attributes that the code below works. If some non-GCC compilers
* masquerading as GCC in fact do not implement these attributes, version checks
* may be required.
*/
/*
* We use the _dt_*_ pattern to avoid clashes with any future macros glibc may
* introduce, which have names of the pattern __attribute_blah__.
*/
/*
* We need a very low priority number to ensure that the constructor
* for USDT DOF loading is executed as early as possible. Meanwhile,
* constructor priorities from 0 to 100 are reserved for the implementation.
* So the constructor priority may trigger a gcc compiler warning.
*/
#define _dt_constructor_(x) __attribute__((__constructor__(0)))
#define _dt_destructor_(x) __attribute__((__destructor__))
#define _dt_printflike_(string_index,first_to_check) __attribute__((__format__(__printf__,(string_index),(first_to_check))))
#define _dt_unused_ __attribute__((__unused__))
#define _dt_noreturn_ __attribute__((__noreturn__))
#define _dt_weak_ __attribute__((__weak__))
#define _dt_unlikely_(x) __builtin_expect((x),0)
#define _dt_barrier_(x) __asm__ __volatile__("": :"r"(x):"memory")
#elif defined (__SUNPRO_C)
#define _dt_constructor_(x) _Pragma("init(" #x ")")
#define _dt_destructor_(x) _Pragma("fini(" #x ")")
#define _dt_noreturn_
#define _dt_weak_
#define _dt_unlikely_(x) (x)
#define _dt_barrier_(x)
/*
* These are lint comments with no compiler equivalent.
*/
#define _dt_printflike_(string_index,first_to_check)
#define _dt_unused_
#endif
#endif
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