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151 lines
6.6 KiB
151 lines
6.6 KiB
7 years ago
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/*
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LUFA Library
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Copyright (C) Dean Camera, 2017.
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dean [at] fourwalledcubicle [dot] com
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www.lufa-lib.org
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*/
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/*
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Copyright 2017 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaims all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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* \brief Special function/variable attribute macros.
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*
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* \copydetails Group_FuncVarAttributes
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*
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* \note Do not include this file directly, rather include the Common.h header file instead to gain this file's
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* functionality.
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*/
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/** \ingroup Group_Common
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* \defgroup Group_FuncVarAttributes Function/Variable Attributes
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* \brief Special function/variable attribute macros.
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*
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* This module contains macros for applying specific attributes to functions and variables to control various
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* optimizer and code generation features of the compiler. Attributes may be placed in the function prototype
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* or variable declaration in any order, and multiple attributes can be specified for a single item via a space
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* separated list.
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*
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* On incompatible versions of GCC or on other compilers, these macros evaluate to nothing unless they are
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* critical to the code's function and thus must throw a compile error when used.
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*
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* @{
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*/
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#ifndef __LUFA_ATTR_H__
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#define __LUFA_ATTR_H__
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/* Preprocessor Checks: */
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#if !defined(__INCLUDE_FROM_COMMON_H)
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#error Do not include this file directly. Include LUFA/Common/Common.h instead to gain this functionality.
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#endif
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/* Public Interface - May be used in end-application: */
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/* Macros: */
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#if (__GNUC__ >= 3) || defined(__DOXYGEN__)
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/** Indicates to the compiler that the function can not ever return, so that any stack restoring or
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* return code may be omitted by the compiler in the resulting binary.
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*/
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#define ATTR_NO_RETURN __attribute__ ((noreturn))
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/** Indicates that the function returns a value which should not be ignored by the user code. When
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* applied, any ignored return value from calling the function will produce a compiler warning.
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*/
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#define ATTR_WARN_UNUSED_RESULT __attribute__ ((warn_unused_result))
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/** Indicates that the specified parameters of the function are pointers which should never be \c NULL.
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* When applied as a 1-based comma separated list the compiler will emit a warning if the specified
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* parameters are known at compiler time to be \c NULL at the point of calling the function.
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*/
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#define ATTR_NON_NULL_PTR_ARG(...) __attribute__ ((nonnull (__VA_ARGS__)))
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/** Removes any preamble or postamble from the function. When used, the function will not have any
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* register or stack saving code. This should be used with caution, and when used the programmer
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* is responsible for maintaining stack and register integrity.
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*/
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#define ATTR_NAKED __attribute__ ((naked))
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/** Prevents the compiler from considering a specified function for in-lining. When applied, the given
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* function will not be in-lined under any circumstances.
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*/
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#define ATTR_NO_INLINE __attribute__ ((noinline))
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/** Forces the compiler to inline the specified function. When applied, the given function will be
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* in-lined under all circumstances.
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*/
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#define ATTR_ALWAYS_INLINE __attribute__ ((always_inline))
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/** Indicates that the specified function is pure, in that it has no side-effects other than global
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* or parameter variable access.
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*/
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#define ATTR_PURE __attribute__ ((pure))
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/** Indicates that the specified function is constant, in that it has no side effects other than
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* parameter access.
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*/
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#define ATTR_CONST __attribute__ ((const))
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/** Marks a given function as deprecated, which produces a warning if the function is called. */
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#define ATTR_DEPRECATED __attribute__ ((deprecated))
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/** Marks a function as a weak reference, which can be overridden by other functions with an
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* identical name (in which case the weak reference is discarded at link time).
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*/
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#define ATTR_WEAK __attribute__ ((weak))
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#endif
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/** Forces the compiler to not automatically zero the given global variable on startup, so that the
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* current RAM contents is retained. Under most conditions this value will be random due to the
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* behavior of volatile memory once power is removed, but may be used in some specific circumstances,
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* like the passing of values back after a system watchdog reset.
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*/
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#define ATTR_NO_INIT __attribute__ ((section (".noinit")))
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/** Places the function in one of the initialization sections, which execute before the main function
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* of the application. Refer to the avr-libc manual for more information on the initialization sections.
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*
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* \param[in] SectionIndex Initialization section number where the function should be placed.
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*/
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#define ATTR_INIT_SECTION(SectionIndex) __attribute__ ((used, naked, section (".init" #SectionIndex )))
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/** Marks a function as an alias for another function.
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*
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* \param[in] Func Name of the function which the given function name should alias.
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*/
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#define ATTR_ALIAS(Func) __attribute__ ((alias( #Func )))
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/** Marks a variable or struct element for packing into the smallest space available, omitting any
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* alignment bytes usually added between fields to optimize field accesses.
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*/
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#define ATTR_PACKED __attribute__ ((packed))
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/** Indicates the minimum alignment in bytes for a variable or struct element.
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*
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* \param[in] Bytes Minimum number of bytes the item should be aligned to.
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*/
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#define ATTR_ALIGNED(Bytes) __attribute__ ((aligned(Bytes)))
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#endif
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/** @} */
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