This group contains basic macros and defines to give access to compiler-specific features. More...

Macros
#define	RTEMS_ALIAS(_target)
	Instructs the compiler to generate an alias to the target function.

#define	RTEMS_ALIGN_DOWN(_value, _alignment) ( ( _value ) & ~( ( _alignment ) - 1 ) )
	Aligns down the value to the alignment.

#define	RTEMS_ALIGN_UP(_value, _alignment) ( ( ( _value ) + ( _alignment ) - 1 ) & ~( ( _alignment ) - 1 ) )
	Aligns up the value to the alignment.

#define	RTEMS_ALIGNED(_alignment)
	Instructs the compiler in a declaration or definition to enforce the alignment.

#define	RTEMS_ALIGNOF(_type_name) sizeof( _type_name )
	Gets the alignment requirement of the type.

#define	RTEMS_ALLOC_ALIGN(_index)
	Tells the compiler in a declaration that the memory allocation alignment parameter of this function is similar to aligned_alloc().

#define	RTEMS_ALLOC_SIZE(_index)
	Tells the compiler in a declaration that the memory allocation size parameter of this function is similar to malloc().

#define	RTEMS_ALLOC_SIZE_2(_count_index, _size_index)
	Tells the compiler in a declaration that the memory allocation item count and item size parameter of this function is similar to calloc().

#define	RTEMS_ARRAY_SIZE(_array) ( sizeof( _array ) / sizeof( ( _array )[ 0 ] ) )
	Gets the element count of the array.

#define	RTEMS_COMPILER_MEMORY_BARRIER() do { } while ( 0 )
	This macro forbids the compiler to reorder read and write commands around it.

#define	RTEMS_CONCAT(_x, _y) _x##_y
	Concatenates _x and _y without expanding.

#define	RTEMS_CONST
	Tells the compiler in a function declaration that this function has no effect except the return value and that the return value depends only on the value of parameters.

#define	RTEMS_CONTAINER_OF(_m, _type, _member_name) ( (_type *) ( (uintptr_t) ( _m ) - offsetof( _type, _member_name ) ) )
	Gets the container of a member.

#define	RTEMS_DECLARE_GLOBAL_SYMBOL(_name) extern char _name[]
	Declares a global symbol with the name.

#define	RTEMS_DEPRECATED
	Instructs the compiler in a declaration to issue a warning whenever a variable, function, or type using this declaration will be used.

#define	RTEMS_COMPILER_DEPRECATED_ATTRIBUTE RTEMS_DEPRECATED
	Provided for backward compatibility.

#define	RTEMS_EXPAND(_token) _token
	Helper macro to perform a macro expansion on the token.

#define	RTEMS_FUNCTION_NAME __func__
	Expands to the name of the function containing the use of this define.

#define	RTEMS_NO_RETURN
	Tells the compiler in a function declaration that this function does not return.

#define	RTEMS_COMPILER_NO_RETURN_ATTRIBUTE RTEMS_NO_RETURN
	Provided for backward compatibility.

#define	RTEMS_SECTION(_section)
	Instructs the compiler to place the variable or function in the section.

#define	RTEMS_STRING(...) #__VA_ARGS__
	Stringifies the arguments without expanding them.

#define	RTEMS_TYPEOF_REFX(_level, _target)
	Gets the pointer reference type.

#define	RTEMS_XCONCAT(_x, _y) RTEMS_CONCAT( _x, _y )
	Concatenates expansion of _x and expansion of _y.

#define	RTEMS_DEQUALIFY_DEPTHX(_ptr_level, _type, _var) ( (_type) (uintptr_t) (const volatile void *)( _var ) )
	Performs a type cast which removes qualifiers without warnings to the type for the variable.

#define	RTEMS_DECONST(_type, _var) RTEMS_DEQUALIFY_DEPTHX( *, _type, _var )
	Performs a type cast which removes const qualifiers without warnings to the type for the pointer variable.

#define	RTEMS_DEQUALIFY(_type, _var) RTEMS_DEQUALIFY_DEPTHX( *, _type, _var )
	Performs a type cast which removes all qualifiers without warnings to the type for the pointer variable.

#define	RTEMS_DEVOLATILE(_type, _var) RTEMS_DEQUALIFY_DEPTHX( *, _type, _var )
	Performs a type cast which removes volatile qualifiers without warnings to the type for the pointer variable.

#define	FALSE 0
	If FALSE is undefined, then FALSE is defined to 0.

#define	RTEMS_HAVE_MEMBER_SAME_TYPE(_t_lhs, _m_lhs, _t_rhs, _m_rhs) true
	Checks if members of two types have compatible types.

#define	RTEMS_INLINE_ROUTINE static inline
	Gives a hint to the compiler in a function declaration to inline this function.

#define	RTEMS_MALLOCLIKE
	Tells the compiler in a declaration that this function is a memory allocation function similar to malloc().

#define	RTEMS_NO_INLINE
	Instructs the compiler in a function declaration to not inline this function.

#define	RTEMS_NOINIT RTEMS_SECTION( ".noinit" )
	Instructs the compiler to place the variable in a section which is not initialized.

#define	RTEMS_OBFUSCATE_VARIABLE(_var) (void) ( _var )
	Obfuscates the variable so that the compiler cannot perform optimizations based on the variable value.

#define	RTEMS_PACKED
	Instructs the compiler in a type definition to place members of a structure or union so that the memory required is minimized.

#define	RTEMS_COMPILER_PACKED_ATTRIBUTE RTEMS_PACKED
	Provided for backward compatibility.

#define	RTEMS_PREDICT_FALSE(_exp) ( _exp )
	Evaluates the integral expression and tells the compiler that the predicted value is false (0).

#define	RTEMS_PREDICT_TRUE(_exp) ( _exp )
	Evaluates the integral expression and tells the compiler that the predicted value is true (1).

#define	RTEMS_PRINTFLIKE(_format_pos, _ap_pos)
	Tells the compiler in a declaration that this function expects printf()-like arguments.

#define	RTEMS_PURE
	Tells the compiler in a function declaration that this function has no effect except the return value and that the return value depends only on the value of parameters and/or global variables.

#define	RTEMS_COMPILER_PURE_ATTRIBUTE RTEMS_PURE
	Provided for backward compatibility.

#define	RTEMS_RETURN_ADDRESS() NULL
	Gets the return address of the current function.

#define	RTEMS_STATIC_ASSERT(_cond, _msg)
	It is defined if a static analysis run is performed.

#define	RTEMS_SYMBOL_NAME(_name) RTEMS_EXPAND( _name )
	Maps the name to the associated symbol name.

#define	TRUE 1
	If TRUE is undefined, then TRUE is defined to 1.

#define	RTEMS_UNREACHABLE() do { } while ( 0 )
	Tells the compiler that this program point is unreachable.

#define	RTEMS_UNUSED
	Tells the compiler that the variable or function is deliberately unused.

#define	RTEMS_COMPILER_UNUSED_ATTRIBUTE RTEMS_UNUSED
	Provided for backward compatibility.

#define	RTEMS_USED
	Tells the compiler that the variable or function is used.

#define	RTEMS_WARN_UNUSED_RESULT
	Tells the compiler in a declaration that the result of this function should be used.

#define	RTEMS_WEAK
	Tells the compiler in a function definition that this function should be weak.

#define	RTEMS_WEAK_ALIAS(_target)
	Instructs the compiler to generate a weak alias to the target function.

#define	RTEMS_XSTRING(...) RTEMS_STRING( __VA_ARGS__ )
	Stringifies the expansion of the arguments.

#define	RTEMS_DEFINE_GLOBAL_SYMBOL(_name, _value)
	Defines a global symbol with the name and value.

#define	RTEMS_ZERO_LENGTH_ARRAY 0
	This constant represents the element count of a zero-length array.

Detailed Description

This group contains basic macros and defines to give access to compiler-specific features.

Macro Definition Documentation

◆ RTEMS_ALIAS

#define RTEMS_ALIAS ( _target )

Instructs the compiler to generate an alias to the target function.

Parameters

_target is the target function name.

◆ RTEMS_ALIGN_DOWN

#define RTEMS_ALIGN_DOWN	(	_value,
		_alignment
	)	( ( _value ) & ~( ( _alignment ) - 1 ) )

Aligns down the value to the alignment.

Parameters

_value	is the value to align down.
_alignment	is the desired alignment in bytes. The alignment shall be a power of two, otherwise the returned value is undefined. The alignment parameter is evaluated twice.

Returns: Returns the value aligned down to the alignment.

◆ RTEMS_ALIGN_UP

#define RTEMS_ALIGN_UP	(	_value,
		_alignment
	)	( ( ( _value ) + ( _alignment ) - 1 ) & ~( ( _alignment ) - 1 ) )

Aligns up the value to the alignment.

Parameters

_value	is the value to align up.
_alignment	is the desired alignment in bytes. The alignment shall be a power of two, otherwise the returned value is undefined. The alignment parameter is evaluated twice.

Returns: Returns the value aligned up to the alignment.

◆ RTEMS_ALIGNED

#define RTEMS_ALIGNED ( _alignment )

Instructs the compiler in a declaration or definition to enforce the alignment.

Parameters

_alignment is the desired alignment in bytes.

◆ RTEMS_ALIGNOF

#define RTEMS_ALIGNOF ( _type_name ) sizeof( _type_name )

Gets the alignment requirement of the type.

Parameters

_type_name is the type name to get the alignment requirement for.

Returns: Returns the alignment requirement of the type.

◆ RTEMS_ALLOC_ALIGN

#define RTEMS_ALLOC_ALIGN ( _index )

Tells the compiler in a declaration that the memory allocation alignment parameter of this function is similar to aligned_alloc().

Parameters

_index is the allocation alignment parameter index (starting with one).

◆ RTEMS_ALLOC_SIZE

#define RTEMS_ALLOC_SIZE ( _index )

Tells the compiler in a declaration that the memory allocation size parameter of this function is similar to malloc().

Parameters

_index is the allocation size parameter index (starting with one).

◆ RTEMS_ALLOC_SIZE_2

#define RTEMS_ALLOC_SIZE_2	(	_count_index,
		_size_index
	)

Tells the compiler in a declaration that the memory allocation item count and item size parameter of this function is similar to calloc().

Parameters

_count_index	is the allocation item count parameter index (starting with one).
_size_index	is the allocation item size parameter index (starting with one).

◆ RTEMS_ARRAY_SIZE

#define RTEMS_ARRAY_SIZE ( _array ) ( sizeof( _array ) / sizeof( ( _array )[ 0 ] ) )

Gets the element count of the array.

Parameters

_array is the name of the array. This parameter is evaluated twice.

Returns: Returns the element count of the array.

◆ RTEMS_CONCAT

#define RTEMS_CONCAT	(	_x,
		_y
	)	_x##_y

Concatenates _x and _y without expanding.

Parameters

_x	is the left hand side token of the concatenation.
_y	is the right hand side token of the concatenation.

Returns: Returns the concatenation of the tokens _x and _y.

◆ RTEMS_CONTAINER_OF

#define RTEMS_CONTAINER_OF	(	_m,
		_type,
		_member_name
	)	( (_type *) ( (uintptr_t) ( _m ) - offsetof( _type, _member_name ) ) )

Gets the container of a member.

Parameters

_m	is the pointer to a member of the container.
_type	is the type of the container.
_member_name	is the designator name of the container member.

Returns: Returns the pointer to the container of a member pointer.

◆ RTEMS_DECLARE_GLOBAL_SYMBOL

#define RTEMS_DECLARE_GLOBAL_SYMBOL ( _name ) extern char _name[]

Declares a global symbol with the name.

Parameters

_name is the name of the global symbol. It shall be a valid designator.

This macro must be placed at file scope.

◆ RTEMS_DECONST

#define RTEMS_DECONST	(	_type,
		_var
	)	RTEMS_DEQUALIFY_DEPTHX( *, _type, _var )

Performs a type cast which removes const qualifiers without warnings to the type for the pointer variable.

Parameters

_type	is the target type of the cast.
_var	is the pointer variable.

◆ RTEMS_DEFINE_GLOBAL_SYMBOL

#define RTEMS_DEFINE_GLOBAL_SYMBOL	(	_name,
		_value
	)

Defines a global symbol with the name and value.

Parameters

_name	is the user defined name of the symbol. The name shall be a valid designator. On the name a macro expansion is performed and afterwards it is stringified.
_value	is the value of the symbol. On the value a macro expansion is performed and afterwards it is stringified. It shall expand to an integer expression understood by the assembler. The value shall be representable in the code model of the target architecture.

This macro shall be placed at file scope.

◆ RTEMS_DEQUALIFY

#define RTEMS_DEQUALIFY	(	_type,
		_var
	)	RTEMS_DEQUALIFY_DEPTHX( *, _type, _var )

Performs a type cast which removes all qualifiers without warnings to the type for the pointer variable.

Parameters

_type	is the target type of the cast.
_var	is the pointer variable.

◆ RTEMS_DEQUALIFY_DEPTHX

#define RTEMS_DEQUALIFY_DEPTHX	(	_ptr_level,
		_type,
		_var
	)	( (_type) (uintptr_t) (const volatile void *)( _var ) )

Performs a type cast which removes qualifiers without warnings to the type for the variable.

Parameters

_ptr_level	is the pointer indirection level expressed in `*`.
_type	is the target type of the cast.
_var	is the variable.

◆ RTEMS_DEVOLATILE

#define RTEMS_DEVOLATILE	(	_type,
		_var
	)	RTEMS_DEQUALIFY_DEPTHX( *, _type, _var )

Performs a type cast which removes volatile qualifiers without warnings to the type for the pointer variable.

Parameters

_type	is the target type of the cast.
_var	is the pointer variable.

◆ RTEMS_EXPAND

#define RTEMS_EXPAND ( _token ) _token

Helper macro to perform a macro expansion on the token.

Parameters

_token is the token to expand.

◆ RTEMS_HAVE_MEMBER_SAME_TYPE

#define RTEMS_HAVE_MEMBER_SAME_TYPE	(	_t_lhs,
		_m_lhs,
		_t_rhs,
		_m_rhs
	)	true

Checks if members of two types have compatible types.

Parameters

_t_lhs	is the left hand side type.
_m_lhs	is the left hand side member.
_t_rhs	is the right hand side type.
_m_rhs	is the right hand side member.

Returns: Returns to true, if the members of two types have compatible types, otherwise false.

◆ RTEMS_OBFUSCATE_VARIABLE

#define RTEMS_OBFUSCATE_VARIABLE ( _var ) (void) ( _var )

Obfuscates the variable so that the compiler cannot perform optimizations based on the variable value.

Parameters

_var	is the variable to obfuscate.

The variable must be simple enough to fit into a register.

◆ RTEMS_PREDICT_FALSE

#define RTEMS_PREDICT_FALSE ( _exp ) ( _exp )

Evaluates the integral expression and tells the compiler that the predicted value is false (0).

Parameters

_exp	is the integral expression.

Returns: Returns the value of the integral expression and tells the compiler that the predicted value is false (0).

◆ RTEMS_PREDICT_TRUE

#define RTEMS_PREDICT_TRUE ( _exp ) ( _exp )

Evaluates the integral expression and tells the compiler that the predicted value is true (1).

Parameters

_exp	is the integral expression.

Returns: Returns the value of the integral expression and tells the compiler that the predicted value is true (1).

◆ RTEMS_PRINTFLIKE

#define RTEMS_PRINTFLIKE	(	_format_pos,
		_ap_pos
	)

Tells the compiler in a declaration that this function expects printf()-like arguments.

Parameters

_format_pos	is the position of the format parameter index (starting with one).
_ap_pos	is the position of the argument pointer parameter index (starting with one).

◆ RTEMS_RETURN_ADDRESS

#define RTEMS_RETURN_ADDRESS ( ) NULL

Gets the return address of the current function.

Returns: Returns the return address of the current function.

◆ RTEMS_SECTION

#define RTEMS_SECTION ( _section )

Instructs the compiler to place the variable or function in the section.

Parameters

_section is the section name as a string.

◆ RTEMS_STATIC_ASSERT

#define RTEMS_STATIC_ASSERT	(	_cond,
		_msg
	)

Value:

struct rtems_static_assert_ ## _msg \

{ int rtems_static_assert_ ## _msg : ( _cond ) ? 1 : -1; }

It is defined if a static analysis run is performed.

Asserts at compile time that the condition is satisfied.

Parameters

_cond	is the condition this static assertion shall satisfy.
_msg	is the error message in case the static assertion fails.

◆ RTEMS_STRING

#define RTEMS_STRING ( ... ) #__VA_ARGS__

Stringifies the arguments without expanding them.

Parameters

...	are the arguments to stringify.

Returns: Returns the stringification of the arguments. In case of several arguments a single string is returned not several.

◆ RTEMS_SYMBOL_NAME

#define RTEMS_SYMBOL_NAME ( _name ) RTEMS_EXPAND( _name )

Maps the name to the associated symbol name.

Parameters

_name is the user defined name of the symbol. The name shall be a valid designator. On the name a macro expansion is performed.

Returns: Returns the symbol name associated with the name.

◆ RTEMS_TYPEOF_REFX

#define RTEMS_TYPEOF_REFX	(	_level,
		_target
	)

Gets the pointer reference type.

Parameters

_level	is the pointer indirection level expressed in `*`.
_target	is the reference target type.

The reference type idea is based on libHX by Jan Engelhardt.

Returns: Returns the type of a pointer reference of the specified level to the specified type.

◆ RTEMS_WEAK

#define RTEMS_WEAK

Tells the compiler in a function definition that this function should be weak.

Use this attribute for function definitions. Do not use it for function declarations.

◆ RTEMS_WEAK_ALIAS

#define RTEMS_WEAK_ALIAS ( _target )

Instructs the compiler to generate a weak alias to the target function.

Parameters

_target is the target function name.

◆ RTEMS_XCONCAT

#define RTEMS_XCONCAT	(	_x,
		_y
	)	RTEMS_CONCAT( _x, _y )

Concatenates expansion of _x and expansion of _y.

Parameters

_x	is expanded first and then used as the left hand side token of the concatenation.
_y	is expanded first and then used as the right hand side token of the concatenation.

Returns: Returns the concatenation of the expansions of tokens _x and _y.

◆ RTEMS_XSTRING

#define RTEMS_XSTRING ( ... ) RTEMS_STRING( __VA_ARGS__ )

Stringifies the expansion of the arguments.

Parameters

...	are the arguments to expand and stringify.

Returns: Returns the stringification of the expansion of the arguments. In case of several arguments a single string is returned not several.

◆ RTEMS_ZERO_LENGTH_ARRAY

#define RTEMS_ZERO_LENGTH_ARRAY 0

This constant represents the element count of a zero-length array.

Zero-length arrays are valid in C99 as flexible array members. C++11 does not allow flexible array members. Use the GNU extension which is also supported by other compilers.

Macros

Detailed Description

Macro Definition Documentation

◆ RTEMS_ALIAS

◆ RTEMS_ALIGN_DOWN

◆ RTEMS_ALIGN_UP

◆ RTEMS_ALIGNED

◆ RTEMS_ALIGNOF

◆ RTEMS_ALLOC_ALIGN

◆ RTEMS_ALLOC_SIZE

◆ RTEMS_ALLOC_SIZE_2

◆ RTEMS_ARRAY_SIZE

◆ RTEMS_CONCAT

◆ RTEMS_CONTAINER_OF

◆ RTEMS_DECLARE_GLOBAL_SYMBOL

◆ RTEMS_DECONST

◆ RTEMS_DEFINE_GLOBAL_SYMBOL

◆ RTEMS_DEQUALIFY

◆ RTEMS_DEQUALIFY_DEPTHX

◆ RTEMS_DEVOLATILE

◆ RTEMS_EXPAND

◆ RTEMS_HAVE_MEMBER_SAME_TYPE

◆ RTEMS_OBFUSCATE_VARIABLE

◆ RTEMS_PREDICT_FALSE

◆ RTEMS_PREDICT_TRUE

◆ RTEMS_PRINTFLIKE

◆ RTEMS_RETURN_ADDRESS

◆ RTEMS_SECTION

◆ RTEMS_STATIC_ASSERT

◆ RTEMS_STRING

◆ RTEMS_SYMBOL_NAME

◆ RTEMS_TYPEOF_REFX

◆ RTEMS_WEAK

◆ RTEMS_WEAK_ALIAS

◆ RTEMS_XCONCAT

◆ RTEMS_XSTRING

◆ RTEMS_ZERO_LENGTH_ARRAY