byte_operators.h File Reference

Expression classes for byte-level operators. More...

#include "invariant.h"
#include "std_expr.h"

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Classes
class	byte_extract_exprt
	Expression of type type extracted from some object op starting at position offset (given in number of bytes). More...
class	byte_update_exprt
	Expression corresponding to op() where the bytes starting at position offset (given in number of bytes) have been updated with value. More...

Functions
template<>
bool	can_cast_expr< byte_extract_exprt > (const exprt &base)
const byte_extract_exprt &	to_byte_extract_expr (const exprt &expr)
byte_extract_exprt &	to_byte_extract_expr (exprt &expr)
void	validate_expr (const byte_extract_exprt &value)
template<>
bool	can_cast_expr< byte_update_exprt > (const exprt &base)
const byte_update_exprt &	to_byte_update_expr (const exprt &expr)
byte_update_exprt &	to_byte_update_expr (exprt &expr)
byte_extract_exprt	make_byte_extract (const exprt &_op, const exprt &_offset, const typet &_type)
	Construct a byte_extract_exprt with endianness and byte width matching the current configuration. More...
byte_update_exprt	make_byte_update (const exprt &_op, const exprt &_offset, const exprt &_value)
	Construct a byte_update_exprt with endianness and byte width matching the current configuration. More...
bool	has_byte_operator (const exprt &src)
	Return true iff src or one of its operands contain a byte extract or byte update expression. More...
exprt	lower_byte_extract (const byte_extract_exprt &src, const namespacet &ns)
	Rewrite a byte extract expression to more fundamental operations. More...
exprt	lower_byte_update (const byte_update_exprt &src, const namespacet &ns)
	Rewrite a byte update expression to more fundamental operations. More...
exprt	lower_byte_operators (const exprt &src, const namespacet &ns)
	Rewrite an expression possibly containing byte-extract or -update expressions to more fundamental operations. More...

Detailed Description

Expression classes for byte-level operators.

Author

Daniel Kroening kroen.nosp@m.ing@.nosp@m.kroen.nosp@m.ing..nosp@m.com

Date

Sun Jul 31 21:54:44 BST 2011

Definition in file byte_operators.h.

Function Documentation

can_cast_expr< byte_extract_exprt >()

template<>

bool can_cast_expr< byte_extract_exprt > ( const exprt &  base )

inline

Definition at line 64 of file byte_operators.h.

can_cast_expr< byte_update_exprt >()

template<>

bool can_cast_expr< byte_update_exprt > ( const exprt &  base )

inline

Definition at line 137 of file byte_operators.h.

has_byte_operator()

bool has_byte_operator

(

const exprt &

src

)

Return true iff src or one of its operands contain a byte extract or byte update expression.

Definition at line 61 of file byte_operators.cpp.

lower_byte_extract()

exprt lower_byte_extract	(	const byte_extract_exprt &	src,
		const namespacet &	ns
	)

Rewrite a byte extract expression to more fundamental operations.

Parameters

src	Byte extract expression
ns	Namespace

Returns

Semantically equivalent expression such that the top-level expression no longer is a byte_extract_exprt or byte_update_exprt. Use lower_byte_operators to also remove all byte operators from any operands of src.

Rewrite a byte extract expression to more fundamental operations.

Definition at line 1215 of file lower_byte_operators.cpp.

lower_byte_operators()

exprt lower_byte_operators	(	const exprt &	src,
		const namespacet &	ns
	)

Rewrite an expression possibly containing byte-extract or -update expressions to more fundamental operations.

Parameters

src	Input expression
ns	Namespace

Returns

Semantically equivalent expression that does not contain any byte_extract_exprt or byte_update_exprt.

Definition at line 2641 of file lower_byte_operators.cpp.

lower_byte_update()

exprt lower_byte_update	(	const byte_update_exprt &	src,
		const namespacet &	ns
	)

Rewrite a byte update expression to more fundamental operations.

Parameters

src	Byte update expression
ns	Namespace

Returns

Semantically equivalent expression such that the top-level expression no longer is a byte_extract_exprt or byte_update_exprt. Use lower_byte_operators to also remove all byte operators from any operands of src.

Definition at line 2548 of file lower_byte_operators.cpp.

make_byte_extract()

byte_extract_exprt make_byte_extract	(	const exprt &	_op,
		const exprt &	_offset,
		const typet &	_type
	)

Construct a byte_extract_exprt with endianness and byte width matching the current configuration.

Definition at line 48 of file byte_operators.cpp.

make_byte_update()

byte_update_exprt make_byte_update	(	const exprt &	_op,
		const exprt &	_offset,
		const exprt &	_value
	)

Construct a byte_update_exprt with endianness and byte width matching the current configuration.

Definition at line 55 of file byte_operators.cpp.

to_byte_extract_expr() [1/2]

const byte_extract_exprt& to_byte_extract_expr ( const exprt &  expr )

inline

Definition at line 70 of file byte_operators.h.

to_byte_extract_expr() [2/2]

byte_extract_exprt& to_byte_extract_expr ( exprt &  expr )

inline

Definition at line 76 of file byte_operators.h.

to_byte_update_expr() [1/2]

const byte_update_exprt& to_byte_update_expr ( const exprt &  expr )

inline

Definition at line 143 of file byte_operators.h.

to_byte_update_expr() [2/2]

byte_update_exprt& to_byte_update_expr ( exprt &  expr )

inline

Definition at line 149 of file byte_operators.h.

validate_expr()

void validate_expr ( const byte_extract_exprt &  value )

inline

Definition at line 82 of file byte_operators.h.