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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_exprtto_byte_extract_expr (const exprt &expr)
 
byte_extract_exprtto_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_exprtto_byte_update_expr (const exprt &expr)
 
byte_update_exprtto_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
srcByte extract expression
nsNamespace
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
srcInput expression
nsNamespace
Returns
Semantically equivalent expression that does not contain any byte_extract_exprt or byte_update_exprt.

Definition at line 2640 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
srcByte update expression
nsNamespace
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 2547 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.