mirror of
https://github.com/qmk/qmk_firmware.git
synced 2024-11-30 23:15:51 +00:00
151 lines
6.6 KiB
C
151 lines
6.6 KiB
C
/*
|
|
LUFA Library
|
|
Copyright (C) Dean Camera, 2017.
|
|
|
|
dean [at] fourwalledcubicle [dot] com
|
|
www.lufa-lib.org
|
|
*/
|
|
|
|
/*
|
|
Copyright 2017 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 disclaims 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
|
|
|
|
/** @} */
|
|
|