arith_tools.cpp File Reference

#include "arith_tools.h"
#include "c_types.h"
#include "expr_util.h"
#include "fixedbv.h"
#include "ieee_float.h"
#include "invariant.h"
#include "std_expr.h"
#include <algorithm>

Include dependency graph for arith_tools.cpp:

Go to the source code of this file.

Functions
bool	to_integer (const constant_exprt &expr, mp_integer &int_value)
	Convert a constant expression expr to an arbitrary-precision integer. More...
constant_exprt	from_integer (const mp_integer &int_value, const typet &type)
std::size_t	address_bits (const mp_integer &size)
	ceil(log2(size)) More...
mp_integer	power (const mp_integer &base, const mp_integer &exponent)
	A multi-precision implementation of the power operator. More...
void	mp_min (mp_integer &a, const mp_integer &b)
void	mp_max (mp_integer &a, const mp_integer &b)
bool	get_bvrep_bit (const irep_idt &src, std::size_t width, std::size_t bit_index)
	Get a bit with given index from bit-vector representation. More...
static char	nibble2hex (unsigned char nibble)
	turn a value 0...15 into '0'-'9', 'A'-'Z' More...
irep_idt	make_bvrep (const std::size_t width, const std::function< bool(std::size_t)> f)
	construct a bit-vector representation from a functor More...
irep_idt	bvrep_bitwise_op (const irep_idt &a, const irep_idt &b, const std::size_t width, const std::function< bool(bool, bool)> f)
	perform a binary bit-wise operation, given as a functor, on a bit-vector representation More...
irep_idt	bvrep_bitwise_op (const irep_idt &a, const std::size_t width, const std::function< bool(bool)> f)
	perform a unary bit-wise operation, given as a functor, on a bit-vector representation More...
irep_idt	integer2bvrep (const mp_integer &src, std::size_t width)
	convert an integer to bit-vector representation with given width This uses two's complement for negative numbers. More...
mp_integer	bvrep2integer (const irep_idt &src, std::size_t width, bool is_signed)
	convert a bit-vector representation (possibly signed) to integer More...

Function Documentation

address_bits()

std::size_t address_bits

(

const mp_integer &

size

)

ceil(log2(size))

Definition at line 183 of file arith_tools.cpp.

bvrep2integer()

mp_integer bvrep2integer	(	const irep_idt &	src,
		std::size_t	width,
		bool	is_signed
	)

convert a bit-vector representation (possibly signed) to integer

Definition at line 408 of file arith_tools.cpp.

bvrep_bitwise_op() [1/2]

irep_idt bvrep_bitwise_op	(	const irep_idt &	a,
		const irep_idt &	b,
		const std::size_t	width,
		const std::function< bool(bool, bool)>	f
	)

perform a binary bit-wise operation, given as a functor, on a bit-vector representation

Parameters

a	the representation of the first bit vector
b	the representation of the second bit vector
width	the width of the bit-vector
f	the functor

Returns

new bitvector representation

Definition at line 356 of file arith_tools.cpp.

bvrep_bitwise_op() [2/2]

irep_idt bvrep_bitwise_op	(	const irep_idt &	a,
		const std::size_t	width,
		const std::function< bool(bool)>	f
	)

perform a unary bit-wise operation, given as a functor, on a bit-vector representation

Parameters

a	the bit-vector representation
width	the width of the bit-vector
f	the functor

Returns

new bitvector representation

Definition at line 373 of file arith_tools.cpp.

from_integer()

constant_exprt from_integer	(	const mp_integer &	int_value,
		const typet &	type
	)

Definition at line 99 of file arith_tools.cpp.

get_bvrep_bit()

bool get_bvrep_bit	(	const irep_idt &	src,
		std::size_t	width,
		std::size_t	bit_index
	)

Get a bit with given index from bit-vector representation.

Parameters

src	the bitvector representation
width	the number of bits in the bitvector
bit_index	index (0 is the least significant)

Definition at line 268 of file arith_tools.cpp.

integer2bvrep()

irep_idt integer2bvrep	(	const mp_integer &	src,
		std::size_t	width
	)

convert an integer to bit-vector representation with given width This uses two's complement for negative numbers.

If the value is out of range, it is 'wrapped around'.

Definition at line 386 of file arith_tools.cpp.

make_bvrep()

irep_idt make_bvrep	(	const std::size_t	width,
		const std::function< bool(std::size_t)>	f
	)

construct a bit-vector representation from a functor

Parameters

width	the width of the bit-vector
f	the functor – the parameter is the bit index

Returns

new bitvector representation

Definition at line 312 of file arith_tools.cpp.

mp_max()

void mp_max	(	mp_integer &	a,
		const mp_integer &	b
	)

Definition at line 258 of file arith_tools.cpp.

mp_min()

void mp_min	(	mp_integer &	a,
		const mp_integer &	b
	)

Definition at line 252 of file arith_tools.cpp.

nibble2hex()

static char nibble2hex ( unsigned char  nibble )

static

turn a value 0...15 into '0'-'9', 'A'-'Z'

Definition at line 297 of file arith_tools.cpp.

power()

mp_integer power	(	const mp_integer &	base,
		const mp_integer &	exponent
	)

A multi-precision implementation of the power operator.

parameters: Two mp_integers, base and exponent

Returns

One mp_integer with the value base^{exponent}

Definition at line 201 of file arith_tools.cpp.

to_integer()

bool to_integer	(	const constant_exprt &	expr,
		mp_integer &	int_value
	)

Convert a constant expression expr to an arbitrary-precision integer.

Parameters

	expr	Source expression
[out]	int_value	Integer value (only modified if conversion succeeds)

Returns

False if, and only if, the conversion was successful.

Definition at line 20 of file arith_tools.cpp.