Z3
Public Member Functions | Data Fields
Tactic Class Reference

Public Member Functions

def __init__ (self, tactic, ctx=None)
 
def __deepcopy__ (self, memo={})
 
def __del__ (self)
 
def solver (self, logFile=None)
 
def apply (self, goal, *arguments, **keywords)
 
def __call__ (self, goal, *arguments, **keywords)
 
def help (self)
 
def param_descrs (self)
 

Data Fields

 ctx
 
 tactic
 

Detailed Description

Tactics transform, solver and/or simplify sets of constraints (Goal). A Tactic can be converted into a Solver using the method solver().

Several combinators are available for creating new tactics using the built-in ones: Then(), OrElse(), FailIf(), Repeat(), When(), Cond().

Definition at line 7683 of file z3py.py.

Constructor & Destructor Documentation

◆ __init__()

def __init__ (   self,
  tactic,
  ctx = None 
)

Definition at line 7688 of file z3py.py.

7688  def __init__(self, tactic, ctx=None):
7689  self.ctx = _get_ctx(ctx)
7690  self.tactic = None
7691  if isinstance(tactic, TacticObj):
7692  self.tactic = tactic
7693  else:
7694  if z3_debug():
7695  _z3_assert(isinstance(tactic, str), "tactic name expected")
7696  try:
7697  self.tactic = Z3_mk_tactic(self.ctx.ref(), str(tactic))
7698  except Z3Exception:
7699  raise Z3Exception("unknown tactic '%s'" % tactic)
7700  Z3_tactic_inc_ref(self.ctx.ref(), self.tactic)
7701 

◆ __del__()

def __del__ (   self)

Definition at line 7705 of file z3py.py.

7705  def __del__(self):
7706  if self.tactic is not None and self.ctx.ref() is not None:
7707  Z3_tactic_dec_ref(self.ctx.ref(), self.tactic)
7708 

Member Function Documentation

◆ __call__()

def __call__ (   self,
  goal,
arguments,
**  keywords 
)
Apply tactic `self` to the given goal or Z3 Boolean expression using the given options.

>>> x, y = Ints('x y')
>>> t = Tactic('solve-eqs')
>>> t(And(x == 0, y >= x + 1))
[[y >= 1]]

Definition at line 7743 of file z3py.py.

7743  def __call__(self, goal, *arguments, **keywords):
7744  """Apply tactic `self` to the given goal or Z3 Boolean expression using the given options.
7745 
7746  >>> x, y = Ints('x y')
7747  >>> t = Tactic('solve-eqs')
7748  >>> t(And(x == 0, y >= x + 1))
7749  [[y >= 1]]
7750  """
7751  return self.apply(goal, *arguments, **keywords)
7752 

◆ __deepcopy__()

def __deepcopy__ (   self,
  memo = {} 
)

Definition at line 7702 of file z3py.py.

7702  def __deepcopy__(self, memo={}):
7703  return Tactic(self.tactic, self.ctx)
7704 

◆ apply()

def apply (   self,
  goal,
arguments,
**  keywords 
)
Apply tactic `self` to the given goal or Z3 Boolean expression using the given options.

>>> x, y = Ints('x y')
>>> t = Tactic('solve-eqs')
>>> t.apply(And(x == 0, y >= x + 1))
[[y >= 1]]

Definition at line 7726 of file z3py.py.

7726  def apply(self, goal, *arguments, **keywords):
7727  """Apply tactic `self` to the given goal or Z3 Boolean expression using the given options.
7728 
7729  >>> x, y = Ints('x y')
7730  >>> t = Tactic('solve-eqs')
7731  >>> t.apply(And(x == 0, y >= x + 1))
7732  [[y >= 1]]
7733  """
7734  if z3_debug():
7735  _z3_assert(isinstance(goal, Goal) or isinstance(goal, BoolRef), "Z3 Goal or Boolean expressions expected")
7736  goal = _to_goal(goal)
7737  if len(arguments) > 0 or len(keywords) > 0:
7738  p = args2params(arguments, keywords, self.ctx)
7739  return ApplyResult(Z3_tactic_apply_ex(self.ctx.ref(), self.tactic, goal.goal, p.params), self.ctx)
7740  else:
7741  return ApplyResult(Z3_tactic_apply(self.ctx.ref(), self.tactic, goal.goal), self.ctx)
7742 

Referenced by Tactic.__call__().

◆ help()

def help (   self)
Display a string containing a description of the available options for the `self` tactic.

Definition at line 7753 of file z3py.py.

7753  def help(self):
7754  """Display a string containing a description of the available options for the `self` tactic."""
7755  print(Z3_tactic_get_help(self.ctx.ref(), self.tactic))
7756 

◆ param_descrs()

def param_descrs (   self)
Return the parameter description set.

Definition at line 7757 of file z3py.py.

7757  def param_descrs(self):
7758  """Return the parameter description set."""
7759  return ParamDescrsRef(Z3_tactic_get_param_descrs(self.ctx.ref(), self.tactic), self.ctx)
7760 

◆ solver()

def solver (   self,
  logFile = None 
)
Create a solver using the tactic `self`.

The solver supports the methods `push()` and `pop()`, but it
will always solve each `check()` from scratch.

>>> t = Then('simplify', 'nlsat')
>>> s = t.solver()
>>> x = Real('x')
>>> s.add(x**2 == 2, x > 0)
>>> s.check()
sat
>>> s.model()
[x = 1.4142135623?]

Definition at line 7709 of file z3py.py.

7709  def solver(self, logFile=None):
7710  """Create a solver using the tactic `self`.
7711 
7712  The solver supports the methods `push()` and `pop()`, but it
7713  will always solve each `check()` from scratch.
7714 
7715  >>> t = Then('simplify', 'nlsat')
7716  >>> s = t.solver()
7717  >>> x = Real('x')
7718  >>> s.add(x**2 == 2, x > 0)
7719  >>> s.check()
7720  sat
7721  >>> s.model()
7722  [x = 1.4142135623?]
7723  """
7724  return Solver(Z3_mk_solver_from_tactic(self.ctx.ref(), self.tactic), self.ctx, logFile)
7725 

Field Documentation

◆ ctx

ctx

◆ tactic

tactic
Z3_mk_solver_from_tactic
Z3_solver Z3_API Z3_mk_solver_from_tactic(Z3_context c, Z3_tactic t)
Create a new solver that is implemented using the given tactic. The solver supports the commands Z3_s...
z3py.UserPropagateBase.__init__
def __init__(self, s, ctx=None)
Definition: z3py.py:10582
Z3_tactic_inc_ref
void Z3_API Z3_tactic_inc_ref(Z3_context c, Z3_tactic t)
Increment the reference counter of the given tactic.
Z3_mk_tactic
Z3_tactic Z3_API Z3_mk_tactic(Z3_context c, Z3_string name)
Return a tactic associated with the given name. The complete list of tactics may be obtained using th...
Z3_tactic_dec_ref
void Z3_API Z3_tactic_dec_ref(Z3_context c, Z3_tactic g)
Decrement the reference counter of the given tactic.
z3py.UserPropagateBase.__del__
def __del__(self)
Definition: z3py.py:10607
Z3_tactic_apply
Z3_apply_result Z3_API Z3_tactic_apply(Z3_context c, Z3_tactic t, Z3_goal g)
Apply tactic t to the goal g.
z3py.z3_debug
def z3_debug()
Definition: z3py.py:56
z3py.UserPropagateBase.solver
solver
Definition: z3py.py:10585
Z3_tactic_get_param_descrs
Z3_param_descrs Z3_API Z3_tactic_get_param_descrs(Z3_context c, Z3_tactic t)
Return the parameter description set for the given tactic object.
Z3_tactic_get_help
Z3_string Z3_API Z3_tactic_get_help(Z3_context c, Z3_tactic t)
Return a string containing a description of parameters accepted by the given tactic.
Z3_tactic_apply_ex
Z3_apply_result Z3_API Z3_tactic_apply_ex(Z3_context c, Z3_tactic t, Z3_goal g, Z3_params p)
Apply tactic t to the goal g using the parameter set p.
z3py.args2params
def args2params(arguments, keywords, ctx=None)
Definition: z3py.py:5111