ModelRef Class Reference

Inheritance diagram for ModelRef:

Public Member Functions
def	__init__ (self, m, ctx)
def	__del__ (self)
def	__repr__ (self)
def	sexpr (self)
def	eval
def	evaluate
def	__len__ (self)
def	get_interp (self, decl)
def	num_sorts (self)
def	get_sort (self, idx)
def	sorts (self)
def	get_universe (self, s)
def	__getitem__ (self, idx)
def	decls (self)
def	update_value (self, x, value)
def	translate (self, target)
def	project (self, vars, fml)
def	project_with_witness (self, vars, fml)
def	__copy__ (self)
def	__deepcopy__
Public Member Functions inherited from Z3PPObject
def	use_pp (self)

Data Fields
	model
	ctx

Detailed Description

Model/Solution of a satisfiability problem (aka system of constraints).

Definition at line 6600 of file z3py.py.

Constructor & Destructor Documentation

def __init__	(		self,
			m,
			ctx
	)

Definition at line 6603 of file z3py.py.

    def __init__(self, m, ctx):
        assert ctx is not None
        self.model = m
        self.ctx = ctx
        Z3_model_inc_ref(self.ctx.ref(), self.model)

def __del__

(

self

)

Definition at line 6609 of file z3py.py.

    def __del__(self):
        if self.ctx.ref() is not None and Z3_model_dec_ref is not None:
            Z3_model_dec_ref(self.ctx.ref(), self.model)

Member Function Documentation

def __copy__

(

self

)

Definition at line 6941 of file z3py.py.

    def __copy__(self):
        return self.translate(self.ctx)

def __deepcopy__	(		self,
			memo = {}
	)

Definition at line 6944 of file z3py.py.

    def __deepcopy__(self, memo={}):
        return self.translate(self.ctx)

def __getitem__	(		self,
			idx
	)

If `idx` is an integer, then the declaration at position `idx` in the model `self` is returned.
If `idx` is a declaration, then the actual interpretation is returned.

The elements can be retrieved using position or the actual declaration.

>>> f = Function('f', IntSort(), IntSort())
>>> x = Int('x')
>>> s = Solver()
>>> s.add(x > 0, x < 2, f(x) == 0)
>>> s.check()
sat
>>> m = s.model()
>>> len(m)
2
>>> m[0]
x
>>> m[1]
f
>>> m[x]
1
>>> m[f]
[else -> 0]
>>> for d in m: print("%s -> %s" % (d, m[d]))
x -> 1
f -> [else -> 0]

Definition at line 6821 of file z3py.py.

    def __getitem__(self, idx):
        """If `idx` is an integer, then the declaration at position `idx` in the model `self` is returned.
        If `idx` is a declaration, then the actual interpretation is returned.

        The elements can be retrieved using position or the actual declaration.

        >>> f = Function('f', IntSort(), IntSort())
        >>> x = Int('x')
        >>> s = Solver()
        >>> s.add(x > 0, x < 2, f(x) == 0)
        >>> s.check()
        sat
        >>> m = s.model()
        >>> len(m)
        2
        >>> m[0]
        x
        >>> m[1]
        f
        >>> m[x]
        1
        >>> m[f]
        [else -> 0]
        >>> for d in m: print("%s -> %s" % (d, m[d]))
        x -> 1
        f -> [else -> 0]
        """
        if _is_int(idx):
            if idx < 0:
                idx += len(self)
            if idx < 0 or idx >= len(self):
                raise IndexError
            num_consts = Z3_model_get_num_consts(self.ctx.ref(), self.model)
            if (idx < num_consts):
                return FuncDeclRef(Z3_model_get_const_decl(self.ctx.ref(), self.model, idx), self.ctx)
            else:
                return FuncDeclRef(Z3_model_get_func_decl(self.ctx.ref(), self.model, idx - num_consts), self.ctx)
        if isinstance(idx, FuncDeclRef):
            return self.get_interp(idx)
        if is_const(idx):
            return self.get_interp(idx.decl())
        if isinstance(idx, SortRef):
            return self.get_universe(idx)
        if z3_debug():
            _z3_assert(False, "Integer, Z3 declaration, or Z3 constant expected. Use model.eval instead for complicated expressions")
        return None

def __len__

(

self

)

Return the number of constant and function declarations in the model `self`.

>>> f = Function('f', IntSort(), IntSort())
>>> x = Int('x')
>>> s = Solver()
>>> s.add(x > 0, f(x) != x)
>>> s.check()
sat
>>> m = s.model()
>>> len(m)
2

Definition at line 6677 of file z3py.py.

    def __len__(self):
        """Return the number of constant and function declarations in the model `self`.

        >>> f = Function('f', IntSort(), IntSort())
        >>> x = Int('x')
        >>> s = Solver()
        >>> s.add(x > 0, f(x) != x)
        >>> s.check()
        sat
        >>> m = s.model()
        >>> len(m)
        2
        """
        num_consts = int(Z3_model_get_num_consts(self.ctx.ref(), self.model))
        num_funcs = int(Z3_model_get_num_funcs(self.ctx.ref(), self.model))
        return num_consts + num_funcs

def __repr__

(

self

)

Definition at line 6613 of file z3py.py.

    def __repr__(self):
        return obj_to_string(self)

def decls

(

self

)

Return a list with all symbols that have an interpretation in the model `self`.
>>> f = Function('f', IntSort(), IntSort())
>>> x = Int('x')
>>> s = Solver()
>>> s.add(x > 0, x < 2, f(x) == 0)
>>> s.check()
sat
>>> m = s.model()
>>> m.decls()
[x, f]

Definition at line 6868 of file z3py.py.

    def decls(self):
        """Return a list with all symbols that have an interpretation in the model `self`.
        >>> f = Function('f', IntSort(), IntSort())
        >>> x = Int('x')
        >>> s = Solver()
        >>> s.add(x > 0, x < 2, f(x) == 0)
        >>> s.check()
        sat
        >>> m = s.model()
        >>> m.decls()
        [x, f]
        """
        r = []
        for i in range(Z3_model_get_num_consts(self.ctx.ref(), self.model)):
            r.append(FuncDeclRef(Z3_model_get_const_decl(self.ctx.ref(), self.model, i), self.ctx))
        for i in range(Z3_model_get_num_funcs(self.ctx.ref(), self.model)):
            r.append(FuncDeclRef(Z3_model_get_func_decl(self.ctx.ref(), self.model, i), self.ctx))
        return r

def eval	(		self,
			t,
			model_completion = False
	)

Evaluate the expression `t` in the model `self`.
If `model_completion` is enabled, then a default interpretation is automatically added
for symbols that do not have an interpretation in the model `self`.

>>> x = Int('x')
>>> s = Solver()
>>> s.add(x > 0, x < 2)
>>> s.check()
sat
>>> m = s.model()
>>> m.eval(x + 1)
2
>>> m.eval(x == 1)
True
>>> y = Int('y')
>>> m.eval(y + x)
1 + y
>>> m.eval(y)
y
>>> m.eval(y, model_completion=True)
0
>>> # Now, m contains an interpretation for y
>>> m.eval(y + x)
1

Definition at line 6620 of file z3py.py.

    def eval(self, t, model_completion=False):
        """Evaluate the expression `t` in the model `self`.
        If `model_completion` is enabled, then a default interpretation is automatically added
        for symbols that do not have an interpretation in the model `self`.

        >>> x = Int('x')
        >>> s = Solver()
        >>> s.add(x > 0, x < 2)
        >>> s.check()
        sat
        >>> m = s.model()
        >>> m.eval(x + 1)
        2
        >>> m.eval(x == 1)
        True
        >>> y = Int('y')
        >>> m.eval(y + x)
        1 + y
        >>> m.eval(y)
        y
        >>> m.eval(y, model_completion=True)
        0
        >>> # Now, m contains an interpretation for y
        >>> m.eval(y + x)
        1
        """
        r = (Ast * 1)()
        if Z3_model_eval(self.ctx.ref(), self.model, t.as_ast(), model_completion, r):
            return _to_expr_ref(r[0], self.ctx)
        raise Z3Exception("failed to evaluate expression in the model")

def evaluate	(		self,
			t,
			model_completion = False
	)

Alias for `eval`.

>>> x = Int('x')
>>> s = Solver()
>>> s.add(x > 0, x < 2)
>>> s.check()
sat
>>> m = s.model()
>>> m.evaluate(x + 1)
2
>>> m.evaluate(x == 1)
True
>>> y = Int('y')
>>> m.evaluate(y + x)
1 + y
>>> m.evaluate(y)
y
>>> m.evaluate(y, model_completion=True)
0
>>> # Now, m contains an interpretation for y
>>> m.evaluate(y + x)
1

Definition at line 6651 of file z3py.py.

    def evaluate(self, t, model_completion=False):
        """Alias for `eval`.

        >>> x = Int('x')
        >>> s = Solver()
        >>> s.add(x > 0, x < 2)
        >>> s.check()
        sat
        >>> m = s.model()
        >>> m.evaluate(x + 1)
        2
        >>> m.evaluate(x == 1)
        True
        >>> y = Int('y')
        >>> m.evaluate(y + x)
        1 + y
        >>> m.evaluate(y)
        y
        >>> m.evaluate(y, model_completion=True)
        0
        >>> # Now, m contains an interpretation for y
        >>> m.evaluate(y + x)
        1
        """
        return self.eval(t, model_completion)

def get_interp	(		self,
			decl
	)

Return the interpretation for a given declaration or constant.

>>> f = Function('f', IntSort(), IntSort())
>>> x = Int('x')
>>> s = Solver()
>>> s.add(x > 0, x < 2, f(x) == 0)
>>> s.check()
sat
>>> m = s.model()
>>> m[x]
1
>>> m[f]
[else -> 0]

Definition at line 6694 of file z3py.py.

Referenced by ModelRef.__getitem__().

    def get_interp(self, decl):
        """Return the interpretation for a given declaration or constant.

        >>> f = Function('f', IntSort(), IntSort())
        >>> x = Int('x')
        >>> s = Solver()
        >>> s.add(x > 0, x < 2, f(x) == 0)
        >>> s.check()
        sat
        >>> m = s.model()
        >>> m[x]
        1
        >>> m[f]
        [else -> 0]
        """
        if z3_debug():
            _z3_assert(isinstance(decl, FuncDeclRef) or is_const(decl), "Z3 declaration expected")
        if is_const(decl):
            decl = decl.decl()
        try:
            if decl.arity() == 0:
                _r = Z3_model_get_const_interp(self.ctx.ref(), self.model, decl.ast)
                if _r.value is None:
                    return None
                r = _to_expr_ref(_r, self.ctx)
                if is_as_array(r):
                    fi = self.get_interp(get_as_array_func(r))
                    if fi is None:
                        return fi                    
                    e = fi.else_value()
                    if e is None:
                        return fi
                    if fi.arity() != 1:
                        return fi
                    srt = decl.range()
                    dom =  srt.domain()
                    e = K(dom, e)
                    i = 0
                    sz = fi.num_entries()
                    n = fi.arity()
                    while i < sz:
                        fe = fi.entry(i)
                        e = Store(e, fe.arg_value(0), fe.value())
                        i += 1
                    return e
                else:
                    return r
            else:
                return FuncInterp(Z3_model_get_func_interp(self.ctx.ref(), self.model, decl.ast), self.ctx)
        except Z3Exception:
            return None

def get_sort	(		self,
			idx
	)

Return the uninterpreted sort at position `idx` < self.num_sorts().

>>> A = DeclareSort('A')
>>> B = DeclareSort('B')
>>> a1, a2 = Consts('a1 a2', A)
>>> b1, b2 = Consts('b1 b2', B)
>>> s = Solver()
>>> s.add(a1 != a2, b1 != b2)
>>> s.check()
sat
>>> m = s.model()
>>> m.num_sorts()
2
>>> m.get_sort(0)
A
>>> m.get_sort(1)
B

Definition at line 6761 of file z3py.py.

    def get_sort(self, idx):
        """Return the uninterpreted sort at position `idx` < self.num_sorts().

        >>> A = DeclareSort('A')
        >>> B = DeclareSort('B')
        >>> a1, a2 = Consts('a1 a2', A)
        >>> b1, b2 = Consts('b1 b2', B)
        >>> s = Solver()
        >>> s.add(a1 != a2, b1 != b2)
        >>> s.check()
        sat
        >>> m = s.model()
        >>> m.num_sorts()
        2
        >>> m.get_sort(0)
        A
        >>> m.get_sort(1)
        B
        """
        if idx >= self.num_sorts():
            raise IndexError
        return _to_sort_ref(Z3_model_get_sort(self.ctx.ref(), self.model, idx), self.ctx)

def get_universe	(		self,
			s
	)

Return the interpretation for the uninterpreted sort `s` in the model `self`.

>>> A = DeclareSort('A')
>>> a, b = Consts('a b', A)
>>> s = Solver()
>>> s.add(a != b)
>>> s.check()
sat
>>> m = s.model()
>>> m.get_universe(A)
[A!val!1, A!val!0]

Definition at line 6801 of file z3py.py.

Referenced by ModelRef.__getitem__().

    def get_universe(self, s):
        """Return the interpretation for the uninterpreted sort `s` in the model `self`.

        >>> A = DeclareSort('A')
        >>> a, b = Consts('a b', A)
        >>> s = Solver()
        >>> s.add(a != b)
        >>> s.check()
        sat
        >>> m = s.model()
        >>> m.get_universe(A)
        [A!val!1, A!val!0]
        """
        if z3_debug():
            _z3_assert(isinstance(s, SortRef), "Z3 sort expected")
        try:
            return AstVector(Z3_model_get_sort_universe(self.ctx.ref(), self.model, s.ast), self.ctx)
        except Z3Exception:
            return None

def num_sorts

(

self

)

Return the number of uninterpreted sorts that contain an interpretation in the model `self`.

>>> A = DeclareSort('A')
>>> a, b = Consts('a b', A)
>>> s = Solver()
>>> s.add(a != b)
>>> s.check()
sat
>>> m = s.model()
>>> m.num_sorts()
1

Definition at line 6746 of file z3py.py.

Referenced by ModelRef.get_sort().

    def num_sorts(self):
        """Return the number of uninterpreted sorts that contain an interpretation in the model `self`.

        >>> A = DeclareSort('A')
        >>> a, b = Consts('a b', A)
        >>> s = Solver()
        >>> s.add(a != b)
        >>> s.check()
        sat
        >>> m = s.model()
        >>> m.num_sorts()
        1
        """
        return int(Z3_model_get_num_sorts(self.ctx.ref(), self.model))

def project	(		self,
			vars,
			fml
	)

Perform model-based projection on fml with respect to vars.
Assume that the model satisfies fml. Then compute a projection fml_p, such
that vars do not occur free in fml_p, fml_p is true in the model and
fml_p => exists vars . fml

Definition at line 6917 of file z3py.py.

    def project(self, vars, fml):
        """Perform model-based projection on fml with respect to vars.
        Assume that the model satisfies fml. Then compute a projection fml_p, such
        that vars do not occur free in fml_p, fml_p is true in the model and
        fml_p => exists vars . fml
        """
        ctx = self.ctx.ref()
        _vars = (Ast * len(vars))()
        for i in range(len(vars)):
            _vars[i] = vars[i].as_ast()
        return _to_expr_ref(Z3_qe_model_project(ctx, self.model, len(vars), _vars, fml.ast), self.ctx)

def project_with_witness	(		self,
			vars,
			fml
	)

Perform model-based projection, but also include realizer terms for the projected variables

Definition at line 6929 of file z3py.py.

    def project_with_witness(self, vars, fml):
        """Perform model-based projection, but also include realizer terms for the projected variables"""
        ctx = self.ctx.ref()
        _vars = (Ast * len(vars))()
        for i in range(len(vars)):
            _vars[i] = vars[i].as_ast()
        defs = AstMap()
        result = Z3_qe_model_project_with_witness(ctx, self.model, len(vars), _vars, fml.ast, defs.map)
        result = _to_expr_ref(result, self.ctx)
        return result, defs

def sexpr

(

self

)

Return a textual representation of the s-expression representing the model.

Definition at line 6616 of file z3py.py.

Referenced by Fixedpoint.__repr__(), and Optimize.__repr__().

    def sexpr(self):
        """Return a textual representation of the s-expression representing the model."""
        return Z3_model_to_string(self.ctx.ref(), self.model)

def sorts

(

self

)

Return all uninterpreted sorts that have an interpretation in the model `self`.

>>> A = DeclareSort('A')
>>> B = DeclareSort('B')
>>> a1, a2 = Consts('a1 a2', A)
>>> b1, b2 = Consts('b1 b2', B)
>>> s = Solver()
>>> s.add(a1 != a2, b1 != b2)
>>> s.check()
sat
>>> m = s.model()
>>> m.sorts()
[A, B]

Definition at line 6784 of file z3py.py.

    def sorts(self):
        """Return all uninterpreted sorts that have an interpretation in the model `self`.

        >>> A = DeclareSort('A')
        >>> B = DeclareSort('B')
        >>> a1, a2 = Consts('a1 a2', A)
        >>> b1, b2 = Consts('b1 b2', B)
        >>> s = Solver()
        >>> s.add(a1 != a2, b1 != b2)
        >>> s.check()
        sat
        >>> m = s.model()
        >>> m.sorts()
        [A, B]
        """
        return [self.get_sort(i) for i in range(self.num_sorts())]

def translate	(		self,
			target
	)

Translate `self` to the context `target`. That is, return a copy of `self` in the context `target`.

Definition at line 6909 of file z3py.py.

Referenced by ModelRef.__copy__(), and ModelRef.__deepcopy__().

    def translate(self, target):
        """Translate `self` to the context `target`. That is, return a copy of `self` in the context `target`.
        """
        if z3_debug():
            _z3_assert(isinstance(target, Context), "argument must be a Z3 context")
        model = Z3_model_translate(self.ctx.ref(), self.model, target.ref())
        return ModelRef(model, target)

def update_value	(		self,
			x,
			value
	)

Update the interpretation of a constant

Definition at line 6887 of file z3py.py.

    def update_value(self, x, value):
        """Update the interpretation of a constant"""
        if is_expr(x):
            x = x.decl()
        if is_func_decl(x) and x.arity() != 0 and isinstance(value, FuncInterp):
            fi1 = value.f
            fi2 = Z3_add_func_interp(x.ctx_ref(), self.model, x.ast, value.else_value().ast);
            fi2 = FuncInterp(fi2, x.ctx)
            for i in range(value.num_entries()):
                e = value.entry(i)
                n = Z3_func_entry_get_num_args(x.ctx_ref(), e.entry)
                v = AstVector()
                for j in range(n):
                    v.push(e.arg_value(j))                    
                val = Z3_func_entry_get_value(x.ctx_ref(), e.entry)
                Z3_func_interp_add_entry(x.ctx_ref(), fi2.f, v.vector, val)
            return
        if not is_func_decl(x) or x.arity() != 0:
            raise Z3Exception("Expecting 0-ary function or constant expression")
        value = _py2expr(value)
        Z3_add_const_interp(x.ctx_ref(), self.model, x.ast, value.ast)

Field Documentation

ctx

Definition at line 6606 of file z3py.py.

Referenced by ModelRef.__copy__(), ModelRef.__deepcopy__(), Fixedpoint.__deepcopy__(), Optimize.__deepcopy__(), ApplyResult.__deepcopy__(), Simplifier.__deepcopy__(), Tactic.__deepcopy__(), Probe.__deepcopy__(), Probe.__eq__(), Probe.__ge__(), ModelRef.__getitem__(), ApplyResult.__getitem__(), Probe.__gt__(), Probe.__le__(), Probe.__lt__(), Probe.__ne__(), Simplifier.add(), Fixedpoint.add_rule(), Optimize.add_soft(), Tactic.apply(), ApplyResult.as_expr(), Optimize.assert_and_track(), Fixedpoint.assert_exprs(), Optimize.assert_exprs(), Optimize.assertions(), ModelRef.decls(), ModelRef.eval(), ParserContext.from_string(), Fixedpoint.get_answer(), Fixedpoint.get_assertions(), Fixedpoint.get_cover_delta(), Fixedpoint.get_ground_sat_answer(), ModelRef.get_interp(), Fixedpoint.get_rule_names_along_trace(), Fixedpoint.get_rules(), Fixedpoint.get_rules_along_trace(), ModelRef.get_sort(), ModelRef.get_universe(), Optimize.model(), Optimize.objectives(), Fixedpoint.param_descrs(), Optimize.param_descrs(), Simplifier.param_descrs(), Tactic.param_descrs(), Fixedpoint.parse_file(), Fixedpoint.parse_string(), ModelRef.project(), ModelRef.project_with_witness(), Fixedpoint.query(), Fixedpoint.set(), Optimize.set(), Optimize.set_on_model(), Tactic.solver(), Fixedpoint.statistics(), Optimize.statistics(), Solver.to_smt2(), Optimize.unsat_core(), Fixedpoint.update_rule(), and Simplifier.using_params().

model

Definition at line 6605 of file z3py.py.

Referenced by ModelRef.__del__(), ModelRef.__getitem__(), ModelRef.__len__(), ModelRef.decls(), ModelRef.eval(), ModelRef.get_interp(), ModelRef.get_sort(), ModelRef.get_universe(), ModelRef.num_sorts(), ModelRef.project(), ModelRef.project_with_witness(), ModelRef.sexpr(), FuncInterp.translate(), ModelRef.translate(), and ModelRef.update_value().