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Diffstat (limited to 'LUFA/Common/Attributes.h')
| -rw-r--r-- | LUFA/Common/Attributes.h | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/LUFA/Common/Attributes.h b/LUFA/Common/Attributes.h new file mode 100644 index 0000000..053a9b8 --- /dev/null +++ b/LUFA/Common/Attributes.h @@ -0,0 +1,139 @@ +/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2010.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.lufa-lib.org
+*/
+
+/*
+ Copyright 2010 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 AVR-GCC special function/variable attribute macros.
+ *
+ * This file contains macros for applying GCC specific attributes to functions and variables to control various
+ * optimiser 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 compiler error when used.
+ *
+ * \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_GCCAttr Function/Variable Attributes
+ *
+ * Macros for easy access GCC function and variable attributes, which can be applied to function prototypes or
+ * variable attributes.
+ *
+ * @{
+ */
+
+#ifndef __FUNCATTR_H__
+#define __FUNCATTR_H__
+
+ /* Preprocessor Checks: */
+ #if !defined(__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 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 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 inlining. When applied, the given
+ * function will not be inlined under any circumstances.
+ */
+ #define ATTR_NO_INLINE __attribute__ ((noinline))
+
+ /** Forces the compiler to inline the specified function. When applied, the given function will be
+ * inlined 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))
+
+ /** 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
+ * behaviour 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")))
+ #endif
+
+ /** 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__ ((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 )))
+#endif
+
+/** @} */
+
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