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/* Every class defined here represents a single bit value of a variable.
Every variable will be represented as a vector of these classes which later
will be used for bit-level symbolic execution. */
#ifndef SYM_EXEC_EXPRESSION_H
#define SYM_EXEC_EXPRESSION_H
#include "stddef.h"
/* Base class for single bit value. */
class value {
protected:
/* This will help us to understand where is moved the bit
from its initial position. */
const size_t index;
public:
value () : index (0)
{};
value (size_t i) : index (i)
{};
value (value &val) : index (val.index)
{};
size_t get_index () const;
/* This will support deep copy of objects' values. */
virtual value *copy () const = 0;
virtual ~value ()
{};
};
/* Represents value of a single bit of symbolic marked variables. */
class symbolic_bit : public value {
public:
symbolic_bit (size_t i) : value (i)
{};
symbolic_bit (const symbolic_bit &sym_bit) : symbolic_bit (sym_bit.index)
{};
value *copy () const;
};
/* Represents value of a single bit. */
class bit : public value {
private:
/* This is the value of a bit. It must be either 1 or 0. */
unsigned char val = 0;
public:
bit (unsigned char i) : val (i)
{};
bit (const bit &b) : bit (b.val)
{};
unsigned char get_val () const;
void set_val (unsigned char new_val);
value *copy () const;
};
/* Bit-level base expression class. In general expressions consist of
two operands. Here we named them left and right. */
class bit_expression : public value {
protected:
value *left = nullptr;
value *right = nullptr;
public:
bit_expression () : left (nullptr), right (nullptr)
{};
bit_expression (value *left, value *right);
bit_expression (const bit_expression &expr);
value *get_left ();
value *get_right ();
void set_left (value *expr);
void set_right (value *expr);
value *copy () const;
virtual ~bit_expression ();
};
/* Bit-level XOR expression. XOR operation on two variables (when one of
them is symbolic) can be represented by XOR operations on
each of their bits. */
class bit_xor_expression : public bit_expression {
public:
bit_xor_expression (value *left, value *right) : bit_expression (left, right)
{};
bit_xor_expression (const bit_xor_expression &expr) : bit_expression (expr)
{};
value *copy () const;
};
/* Bit-level AND expression. AND operation on two variables (when one of
them is symbolic) can be represented by AND operations on
each of their bits. */
class bit_and_expression : public bit_expression {
public:
bit_and_expression (value *left, value *right) : bit_expression (left, right)
{};
bit_and_expression (const bit_and_expression &expr) : bit_expression (expr)
{};
value *copy () const;
};
/* Bit-level OR expression. OR operation on two variables (when one of
them is symbolic) can be represented by OR operations on
each of their bits. */
class bit_or_expression : public bit_expression {
public:
bit_or_expression (value *left, value *right) : bit_expression (left, right)
{};
bit_or_expression (bit_or_expression &expr) : bit_expression (expr)
{};
value *copy () const;
};
/* SHIFT_RIGHT expression. Result must be stored bit by bit. */
class shift_right_expression : public bit_expression {
public:
shift_right_expression (value *left, value *right) : bit_expression (left,
right)
{};
shift_right_expression (const shift_right_expression &expr)
: bit_expression (expr)
{};
value *copy () const;
};
/* SHIFT_LEFT expression. Result must be stored bit by bit. */
class shift_left_expression : public bit_expression {
public:
shift_left_expression (value *left, value *right) : bit_expression (left,
right)
{};
shift_left_expression (const shift_left_expression &expr)
: bit_expression (expr)
{};
value *copy () const;
};
/* ADD expression. Result must be stored bit by bit. */
class add_expression : public bit_expression {
public:
add_expression (value *left, value *right) : bit_expression (left, right)
{};
add_expression (const add_expression &expr) : bit_expression (expr)
{};
value *copy () const;
};
/* SUB expression. Result must be stored bit by bit. */
class sub_expression : public bit_expression {
public:
sub_expression (value *left, value *right) : bit_expression (left, right)
{};
sub_expression (const sub_expression &expr) : bit_expression (expr)
{};
value *copy () const;
};
/* Bit-level negation expression. */
class bit_complement_expression : public bit_expression {
public:
bit_complement_expression (value *right);
bit_complement_expression (const bit_complement_expression &expr)
: bit_expression (expr)
{};
value *copy () const;
};
#endif /* SYM_EXEC_EXPRESSION_H. */
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