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-/*
- LUFA Library
- Copyright (C) Dean Camera, 2012.
-
- dean [at] fourwalledcubicle [dot] com
- www.lufa-lib.org
-*/
-
-/*
- Copyright 2012 Dean Camera (dean [at] fourwalledcubicle [dot] com)
-
- Permission to use, copy, modify, distribute, and sell this
- software and its documentation for any purpose is hereby granted
- without fee, provided that the above copyright notice appear in
- all copies and that both that the copyright notice and this
- permission notice and warranty disclaimer appear in supporting
- documentation, and that the name of the author not be used in
- advertising or publicity pertaining to distribution of the
- software without specific, written prior permission.
-
- The author disclaim all warranties with regard to this
- software, including all implied warranties of merchantability
- and fitness. In no event shall the author be liable for any
- special, indirect or consequential damages or any damages
- whatsoever resulting from loss of use, data or profits, whether
- in an action of contract, negligence or other tortious action,
- arising out of or in connection with the use or performance of
- this software.
-*/
-
-/** \file
- * \brief Special function/variable attribute macros.
- *
- * \copydetails Group_FuncVarAttributes
- *
- * \note Do not include this file directly, rather include the Common.h header file instead to gain this file's
- * functionality.
- */
-
-/** \ingroup Group_Common
- * \defgroup Group_FuncVarAttributes Function/Variable Attributes
- * \brief Special function/variable attribute macros.
- *
- * This module contains macros for applying specific attributes to functions and variables to control various
- * optimizer and code generation features of the compiler. Attributes may be placed in the function prototype
- * or variable declaration in any order, and multiple attributes can be specified for a single item via a space
- * separated list.
- *
- * On incompatible versions of GCC or on other compilers, these macros evaluate to nothing unless they are
- * critical to the code's function and thus must throw a compile error when used.
- *
- * @{
- */
-
-#ifndef __LUFA_ATTR_H__
-#define __LUFA_ATTR_H__
-
- /* Preprocessor Checks: */
- #if !defined(__INCLUDE_FROM_COMMON_H)
- #error Do not include this file directly. Include LUFA/Common/Common.h instead to gain this functionality.
- #endif
-
- /* Public Interface - May be used in end-application: */
- /* Macros: */
- #if (__GNUC__ >= 3) || defined(__DOXYGEN__)
- /** Indicates to the compiler that the function can not ever return, so that any stack restoring or
- * return code may be omitted by the compiler in the resulting binary.
- */
- #define ATTR_NO_RETURN __attribute__ ((noreturn))
-
- /** Indicates that the function returns a value which should not be ignored by the user code. When
- * applied, any ignored return value from calling the function will produce a compiler warning.
- */
- #define ATTR_WARN_UNUSED_RESULT __attribute__ ((warn_unused_result))
-
- /** Indicates that the specified parameters of the function are pointers which should never be \c NULL.
- * When applied as a 1-based comma separated list the compiler will emit a warning if the specified
- * parameters are known at compiler time to be \c NULL at the point of calling the function.
- */
- #define ATTR_NON_NULL_PTR_ARG(...) __attribute__ ((nonnull (__VA_ARGS__)))
-
- /** Removes any preamble or postamble from the function. When used, the function will not have any
- * register or stack saving code. This should be used with caution, and when used the programmer
- * is responsible for maintaining stack and register integrity.
- */
- #define ATTR_NAKED __attribute__ ((naked))
-
- /** Prevents the compiler from considering a specified function for in-lining. When applied, the given
- * function will not be in-lined under any circumstances.
- */
- #define ATTR_NO_INLINE __attribute__ ((noinline))
-
- /** Forces the compiler to inline the specified function. When applied, the given function will be
- * in-lined under all circumstances.
- */
- #define ATTR_ALWAYS_INLINE __attribute__ ((always_inline))
-
- /** Indicates that the specified function is pure, in that it has no side-effects other than global
- * or parameter variable access.
- */
- #define ATTR_PURE __attribute__ ((pure))
-
- /** Indicates that the specified function is constant, in that it has no side effects other than
- * parameter access.
- */
- #define ATTR_CONST __attribute__ ((const))
-
- /** Marks a given function as deprecated, which produces a warning if the function is called. */
- #define ATTR_DEPRECATED __attribute__ ((deprecated))
-
- /** Marks a function as a weak reference, which can be overridden by other functions with an
- * identical name (in which case the weak reference is discarded at link time).
- */
- #define ATTR_WEAK __attribute__ ((weak))
- #endif
-
- /** Forces the compiler to not automatically zero the given global variable on startup, so that the
- * current RAM contents is retained. Under most conditions this value will be random due to the
- * behavior of volatile memory once power is removed, but may be used in some specific circumstances,
- * like the passing of values back after a system watchdog reset.
- */
- #define ATTR_NO_INIT __attribute__ ((section (".noinit")))
-
- /** Places the function in one of the initialization sections, which execute before the main function
- * of the application. Refer to the avr-libc manual for more information on the initialization sections.
- *
- * \param[in] SectionIndex Initialization section number where the function should be placed.
- */
- #define ATTR_INIT_SECTION(SectionIndex) __attribute__ ((used, naked, section (".init" #SectionIndex )))
-
- /** Marks a function as an alias for another function.
- *
- * \param[in] Func Name of the function which the given function name should alias.
- */
- #define ATTR_ALIAS(Func) __attribute__ ((alias( #Func )))
-
- /** Marks a variable or struct element for packing into the smallest space available, omitting any
- * alignment bytes usually added between fields to optimize field accesses.
- */
- #define ATTR_PACKED __attribute__ ((packed))
-
- /** Indicates the minimum alignment in bytes for a variable or struct element.
- *
- * \param[in] Bytes Minimum number of bytes the item should be aligned to.
- */
- #define ATTR_ALIGNED(Bytes) __attribute__ ((aligned(Bytes)))
-#endif
-
-/** @} */
-