+/*\r
+ LUFA Library\r
+ Copyright (C) Dean Camera, 2010.\r
+ \r
+ dean [at] fourwalledcubicle [dot] com\r
+ www.fourwalledcubicle.com\r
+*/\r
+\r
+/*\r
+ Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)\r
+\r
+ Permission to use, copy, modify, distribute, and sell this \r
+ software and its documentation for any purpose is hereby granted\r
+ without fee, provided that the above copyright notice appear in \r
+ all copies and that both that the copyright notice and this\r
+ permission notice and warranty disclaimer appear in supporting \r
+ documentation, and that the name of the author not be used in \r
+ advertising or publicity pertaining to distribution of the \r
+ software without specific, written prior permission.\r
+\r
+ The author disclaim all warranties with regard to this\r
+ software, including all implied warranties of merchantability\r
+ and fitness. In no event shall the author be liable for any\r
+ special, indirect or consequential damages or any damages\r
+ whatsoever resulting from loss of use, data or profits, whether\r
+ in an action of contract, negligence or other tortious action,\r
+ arising out of or in connection with the use or performance of\r
+ this software.\r
+*/\r
+\r
+/** \file\r
+ * \brief AVR-GCC special function/variable attribute macros.\r
+ *\r
+ * This file contains macros for applying GCC specific attributes to functions and variables to control various\r
+ * optimizer and code generation features of the compiler. Attributes may be placed in the function prototype \r
+ * or variable declaration in any order, and multiple attributes can be specified for a single item via a space\r
+ * separated list.\r
+ *\r
+ * On incompatible versions of GCC or on other compilers, these macros evaluate to nothing unless they are\r
+ * critical to the code's function and thus must throw a compiler error when used.\r
+ *\r
+ * \note Do not include this file directly, rather include the Common.h header file instead to gain this file's\r
+ * functionality.\r
+ */\r
+ \r
+/** \ingroup Group_Common\r
+ * @defgroup Group_GCCAttr Function/Variable Attributes\r
+ *\r
+ * Macros for easy access GCC function and variable attributes, which can be applied to function prototypes or\r
+ * variable attributes.\r
+ *\r
+ * @{\r
+ */\r
+\r
+#ifndef __FUNCATTR_H__\r
+#define __FUNCATTR_H__\r
+\r
+ /* Preprocessor Checks: */\r
+ #if !defined(__COMMON_H__)\r
+ #error Do not include this file directly. Include LUFA/Common/Common.h instead to gain this functionality.\r
+ #endif\r
+\r
+ /* Public Interface - May be used in end-application: */\r
+ /* Macros: */\r
+ #if (__GNUC__ >= 3) || defined(__DOXYGEN__)\r
+ /** Indicates to the compiler that the function can not ever return, so that any stack restoring or\r
+ * return code may be omitted by the compiler in the resulting binary.\r
+ */\r
+ #define ATTR_NO_RETURN __attribute__ ((noreturn))\r
+ \r
+ /** Indicates that the function returns a value which should not be ignored by the user code. When\r
+ * applied, any ignored return value from calling the function will produce a compiler warning.\r
+ */\r
+ #define ATTR_WARN_UNUSED_RESULT __attribute__ ((warn_unused_result))\r
+\r
+ /** Indicates that the specified parameters of the function are pointers which should never be NULL.\r
+ * When applied as a 1-based comma separated list the compiler will emit a warning if the specified\r
+ * parameters are known at compiler time to be NULL at the point of calling the function.\r
+ */\r
+ #define ATTR_NON_NULL_PTR_ARG(...) __attribute__ ((nonnull (__VA_ARGS__)))\r
+\r
+ /** Removes any preamble or postamble from the function. When used, the function will not have any\r
+ * register or stack saving code. This should be used with caution, and when used the programmer\r
+ * is responsible for maintaining stack and register integrity.\r
+ */\r
+ #define ATTR_NAKED __attribute__ ((naked))\r
+ \r
+ /** Prevents the compiler from considering a specified function for inlining. When applied, the given\r
+ * function will not be inlined under any circumstances.\r
+ */\r
+ #define ATTR_NO_INLINE __attribute__ ((noinline))\r
+\r
+ /** Forces the compiler to inline the specified function. When applied, the given function will be\r
+ * inlined under all circumstances.\r
+ */\r
+ #define ATTR_ALWAYS_INLINE __attribute__ ((always_inline))\r
+ \r
+ /** Indicates that the specified function is pure, in that it has no side-effects other than global\r
+ * or parameter variable access.\r
+ */\r
+ #define ATTR_PURE __attribute__ ((pure))\r
+ \r
+ /** Indicates that the specified function is constant, in that it has no side effects other than\r
+ * parameter access.\r
+ */\r
+ #define ATTR_CONST __attribute__ ((const))\r
+ \r
+ /** Marks a given function as deprecated, which produces a warning if the function is called. */\r
+ #define ATTR_DEPRECATED __attribute__ ((deprecated))\r
+ \r
+ /** Marks a function as a weak reference, which can be overridden by other functions with an\r
+ * identical name (in which case the weak reference is discarded at link time).\r
+ */\r
+ #define ATTR_WEAK __attribute__ ((weak))\r
+ \r
+ /** Forces the compiler to not automatically zero the given global variable on startup, so that the\r
+ * current RAM contents is retained. Under most conditions this value will be random due to the\r
+ * behaviour of volatile memory once power is removed, but may be used in some specific circumstances,\r
+ * like the passing of values back after a system watchdog reset.\r
+ */\r
+ #define ATTR_NO_INIT __attribute__ ((section (".noinit")))\r
+ #endif\r
+\r
+ /** Places the function in one of the initialization sections, which execute before the main function\r
+ * of the application. The init function number can be specified as "x", as an integer. Refer to the\r
+ * avr-libc manual for more information on the initialization sections.\r
+ */\r
+ #define ATTR_INIT_SECTION(x) __attribute__ ((naked, section (".init" #x )))\r
+ \r
+ /** Marks a function as an alias for another function of name "x". */\r
+ #define ATTR_ALIAS(x) __attribute__ ((alias( #x )))\r
+#endif\r
+\r
+/** @} */\r
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