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Diffstat (limited to 'lib/lufa/LUFA/Common/Attributes.h')
| -rw-r--r-- | lib/lufa/LUFA/Common/Attributes.h | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/lib/lufa/LUFA/Common/Attributes.h b/lib/lufa/LUFA/Common/Attributes.h new file mode 100644 index 000000000..c8e4104d7 --- /dev/null +++ b/lib/lufa/LUFA/Common/Attributes.h @@ -0,0 +1,150 @@ +/* + 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 + +/** @} */ + |