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 7664 of file z3py.py.

Constructor & Destructor Documentation

◆ __init__()

def __init__ (   self,
  tactic,
  ctx = None 
)

Definition at line 7669 of file z3py.py.

7669  def __init__(self, tactic, ctx=None):
7670  self.ctx = _get_ctx(ctx)
7671  self.tactic = None
7672  if isinstance(tactic, TacticObj):
7673  self.tactic = tactic
7674  else:
7675  if z3_debug():
7676  _z3_assert(isinstance(tactic, str), "tactic name expected")
7677  try:
7678  self.tactic = Z3_mk_tactic(self.ctx.ref(), str(tactic))
7679  except Z3Exception:
7680  raise Z3Exception("unknown tactic '%s'" % tactic)
7681  Z3_tactic_inc_ref(self.ctx.ref(), self.tactic)
7682 

◆ __del__()

def __del__ (   self)

Definition at line 7686 of file z3py.py.

7686  def __del__(self):
7687  if self.tactic is not None and self.ctx.ref() is not None:
7688  Z3_tactic_dec_ref(self.ctx.ref(), self.tactic)
7689 

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 7724 of file z3py.py.

7724  def __call__(self, goal, *arguments, **keywords):
7725  """Apply tactic `self` to the given goal or Z3 Boolean expression using the given options.
7726 
7727  >>> x, y = Ints('x y')
7728  >>> t = Tactic('solve-eqs')
7729  >>> t(And(x == 0, y >= x + 1))
7730  [[y >= 1]]
7731  """
7732  return self.apply(goal, *arguments, **keywords)
7733 

◆ __deepcopy__()

def __deepcopy__ (   self,
  memo = {} 
)

Definition at line 7683 of file z3py.py.

7683  def __deepcopy__(self, memo={}):
7684  return Tactic(self.tactic, self.ctx)
7685 

◆ 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 7707 of file z3py.py.

7707  def apply(self, goal, *arguments, **keywords):
7708  """Apply tactic `self` to the given goal or Z3 Boolean expression using the given options.
7709 
7710  >>> x, y = Ints('x y')
7711  >>> t = Tactic('solve-eqs')
7712  >>> t.apply(And(x == 0, y >= x + 1))
7713  [[y >= 1]]
7714  """
7715  if z3_debug():
7716  _z3_assert(isinstance(goal, Goal) or isinstance(goal, BoolRef), "Z3 Goal or Boolean expressions expected")
7717  goal = _to_goal(goal)
7718  if len(arguments) > 0 or len(keywords) > 0:
7719  p = args2params(arguments, keywords, self.ctx)
7720  return ApplyResult(Z3_tactic_apply_ex(self.ctx.ref(), self.tactic, goal.goal, p.params), self.ctx)
7721  else:
7722  return ApplyResult(Z3_tactic_apply(self.ctx.ref(), self.tactic, goal.goal), self.ctx)
7723 

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 7734 of file z3py.py.

7734  def help(self):
7735  """Display a string containing a description of the available options for the `self` tactic."""
7736  print(Z3_tactic_get_help(self.ctx.ref(), self.tactic))
7737 

◆ param_descrs()

def param_descrs (   self)
Return the parameter description set.

Definition at line 7738 of file z3py.py.

7738  def param_descrs(self):
7739  """Return the parameter description set."""
7740  return ParamDescrsRef(Z3_tactic_get_param_descrs(self.ctx.ref(), self.tactic), self.ctx)
7741 

◆ 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 7690 of file z3py.py.

7690  def solver(self, logFile=None):
7691  """Create a solver using the tactic `self`.
7692 
7693  The solver supports the methods `push()` and `pop()`, but it
7694  will always solve each `check()` from scratch.
7695 
7696  >>> t = Then('simplify', 'nlsat')
7697  >>> s = t.solver()
7698  >>> x = Real('x')
7699  >>> s.add(x**2 == 2, x > 0)
7700  >>> s.check()
7701  sat
7702  >>> s.model()
7703  [x = 1.4142135623?]
7704  """
7705  return Solver(Z3_mk_solver_from_tactic(self.ctx.ref(), self.tactic), self.ctx, logFile)
7706 

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...
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.
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
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:5093