Add more missing function attributes to the TWI peripheral driver.

[pub/USBasp.git] / LUFA / Common / Attributes.h

diff --git a/LUFA/Common/Attributes.h b/LUFA/Common/Attributes.h
index bcac84c..d6722a2 100644 (file)
--- a/LUFA/Common/Attributes.h
+++ b/LUFA/Common/Attributes.h
@@ -1,21 +1,21 @@
 /*
              LUFA Library
 /*
              LUFA Library

-     Copyright (C) Dean Camera, 2010.
-              
+     Copyright (C) Dean Camera, 2011.
+

   dean [at] fourwalledcubicle [dot] com
   dean [at] fourwalledcubicle [dot] com

-      www.fourwalledcubicle.com
+           www.lufa-lib.org

 */
 
 /*
 */
 
 /*

-  Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)
+  Copyright 2011  Dean Camera (dean [at] fourwalledcubicle [dot] com)

 
 

-  Permission to use, copy, modify, distribute, and sell this 
+  Permission to use, copy, modify, distribute, and sell this

   software and its documentation for any purpose is hereby granted
   software and its documentation for any purpose is hereby granted

-  without fee, provided that the above copyright notice appear in 
+  without fee, provided that the above copyright notice appear in

   all copies and that both that the copyright notice and this
   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 
+  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 without specific, written prior permission.
 
   The author disclaim all warranties with regard to this


@@ -29,34 +29,34 @@
 */
 
 /** \file
 */
 
 /** \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.
+ *  \brief Special function/variable attribute macros.

  *
  *

- *  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.
+ *  \copydetails Group_FuncVarAttributes

  *
  *  \note Do not include this file directly, rather include the Common.h header file instead to gain this file's
  *        functionality.
  */
  *
  *  \note Do not include this file directly, rather include the Common.h header file instead to gain this file's
  *        functionality.
  */

- 
+

 /** \ingroup Group_Common
 /** \ingroup Group_Common

- *  @defgroup Group_GCCAttr Function/Variable Attributes
+ *  \defgroup Group_FuncVarAttributes Function/Variable Attributes
+ *  \brief Special function/variable attribute macros.

  *
  *

- *  Macros for easy access GCC function and variable attributes, which can be applied to function prototypes or
- *  variable attributes.
+ *  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 __FUNCATTR_H__
-#define __FUNCATTR_H__
+#ifndef __LUFA_FUNCATTR_H__
+#define __LUFA_FUNCATTR_H__

 
        /* Preprocessor Checks: */
 
        /* Preprocessor Checks: */

-               #if !defined(__COMMON_H__)
+               #if !defined(__INCLUDE_FROM_COMMON_H)

                        #error Do not include this file directly. Include LUFA/Common/Common.h instead to gain this functionality.
                #endif
 
                        #error Do not include this file directly. Include LUFA/Common/Common.h instead to gain this functionality.
                #endif
 


@@ -67,15 +67,15 @@
                                 *  return code may be omitted by the compiler in the resulting binary.
                                 */
                                #define ATTR_NO_RETURN              __attribute__ ((noreturn))
                                 *  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 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.
+                               /** 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
                                 *  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.
+                                *  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__)))
 
                                 */
                                #define ATTR_NON_NULL_PTR_ARG(...)  __attribute__ ((nonnull (__VA_ARGS__)))
 


@@ -84,35 +84,35 @@
                                 *  is responsible for maintaining stack and register integrity.
                                 */
                                #define ATTR_NAKED                  __attribute__ ((naked))
                                 *  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.
+
+                               /** 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
                                 */
                                #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.
+                                *  in-lined under all circumstances.

                                 */
                                #define ATTR_ALWAYS_INLINE          __attribute__ ((always_inline))
                                 */
                                #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 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))
                                /** 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 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))
                                /** 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,
                                /** 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,


@@ -127,12 +127,24 @@
                         *  \param[in] SectionIndex  Initialization section number where the function should be placed.
                         */
                        #define ATTR_INIT_SECTION(SectionIndex) __attribute__ ((naked, section (".init" #SectionIndex )))
                         *  \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 )))
                        /** 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
 
 /** @} */
 #endif
 
 /** @} */

+