Z3
Public Member Functions | Data Fields
Tactic Class Reference

Public Member Functions

def __init__
 
def __deepcopy__
 
def __del__ (self)
 
def solver
 
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 8231 of file z3py.py.

Constructor & Destructor Documentation

def __init__ (   self,
  tactic,
  ctx = None 
)

Definition at line 8239 of file z3py.py.

8239  def __init__(self, tactic, ctx=None):
8240  self.ctx = _get_ctx(ctx)
8241  self.tactic = None
8242  if isinstance(tactic, TacticObj):
8243  self.tactic = tactic
8244  else:
8245  if z3_debug():
8246  _z3_assert(isinstance(tactic, str), "tactic name expected")
8247  try:
8248  self.tactic = Z3_mk_tactic(self.ctx.ref(), str(tactic))
8249  except Z3Exception:
8250  raise Z3Exception("unknown tactic '%s'" % tactic)
8251  Z3_tactic_inc_ref(self.ctx.ref(), self.tactic)
8252 
void Z3_API Z3_tactic_inc_ref(Z3_context c, Z3_tactic t)
Increment the reference counter of the given 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...
def __init__
Definition: z3py.py:8239
def z3_debug()
Definition: z3py.py:62
def __del__ (   self)

Definition at line 8256 of file z3py.py.

8256  def __del__(self):
8257  if self.tactic is not None and self.ctx.ref() is not None and Z3_tactic_dec_ref is not None:
8258  Z3_tactic_dec_ref(self.ctx.ref(), self.tactic)
8259 
def __del__(self)
Definition: z3py.py:8256
void Z3_API Z3_tactic_dec_ref(Z3_context c, Z3_tactic g)
Decrement the reference counter of the given tactic.

Member Function Documentation

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 8294 of file z3py.py.

8294  def __call__(self, goal, *arguments, **keywords):
8295  """Apply tactic `self` to the given goal or Z3 Boolean expression using the given options.
8296 
8297  >>> x, y = Ints('x y')
8298  >>> t = Tactic('solve-eqs')
8299  >>> t(And(x == 0, y >= x + 1))
8300  [[y >= 1]]
8301  """
8302  return self.apply(goal, *arguments, **keywords)
8303 
def apply(self, goal, arguments, keywords)
Definition: z3py.py:8277
def __call__(self, goal, arguments, keywords)
Definition: z3py.py:8294
def __deepcopy__ (   self,
  memo = {} 
)

Definition at line 8253 of file z3py.py.

8253  def __deepcopy__(self, memo={}):
8254  return Tactic(self.tactic, self.ctx)
8255 
def __deepcopy__
Definition: z3py.py:8253
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 8277 of file z3py.py.

Referenced by Tactic.__call__().

8277  def apply(self, goal, *arguments, **keywords):
8278  """Apply tactic `self` to the given goal or Z3 Boolean expression using the given options.
8279 
8280  >>> x, y = Ints('x y')
8281  >>> t = Tactic('solve-eqs')
8282  >>> t.apply(And(x == 0, y >= x + 1))
8283  [[y >= 1]]
8284  """
8285  if z3_debug():
8286  _z3_assert(isinstance(goal, (Goal, BoolRef)), "Z3 Goal or Boolean expressions expected")
8287  goal = _to_goal(goal)
8288  if len(arguments) > 0 or len(keywords) > 0:
8289  p = args2params(arguments, keywords, self.ctx)
8290  return ApplyResult(Z3_tactic_apply_ex(self.ctx.ref(), self.tactic, goal.goal, p.params), self.ctx)
8291  else:
8292  return ApplyResult(Z3_tactic_apply(self.ctx.ref(), self.tactic, goal.goal), self.ctx)
8293 
Z3_apply_result Z3_API Z3_tactic_apply(Z3_context c, Z3_tactic t, Z3_goal g)
Apply tactic t to the goal g.
def args2params
Definition: z3py.py:5458
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.
def apply(self, goal, arguments, keywords)
Definition: z3py.py:8277
def z3_debug()
Definition: z3py.py:62
def help (   self)
Display a string containing a description of the available options for the `self` tactic.

Definition at line 8304 of file z3py.py.

8304  def help(self):
8305  """Display a string containing a description of the available options for the `self` tactic."""
8306  print(Z3_tactic_get_help(self.ctx.ref(), self.tactic))
8307 
def help(self)
Definition: z3py.py:8304
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.
def param_descrs (   self)
Return the parameter description set.

Definition at line 8308 of file z3py.py.

8308  def param_descrs(self):
8309  """Return the parameter description set."""
8310  return ParamDescrsRef(Z3_tactic_get_param_descrs(self.ctx.ref(), self.tactic), self.ctx)
8311 
8312 
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.
def param_descrs(self)
Definition: z3py.py:8308
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 8260 of file z3py.py.

8260  def solver(self, logFile=None):
8261  """Create a solver using the tactic `self`.
8262 
8263  The solver supports the methods `push()` and `pop()`, but it
8264  will always solve each `check()` from scratch.
8265 
8266  >>> t = Then('simplify', 'nlsat')
8267  >>> s = t.solver()
8268  >>> x = Real('x')
8269  >>> s.add(x**2 == 2, x > 0)
8270  >>> s.check()
8271  sat
8272  >>> s.model()
8273  [x = 1.4142135623?]
8274  """
8275  return Solver(Z3_mk_solver_from_tactic(self.ctx.ref(), self.tactic), self.ctx, logFile)
8276 
def solver
Definition: z3py.py:8260
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...

Field Documentation

ctx
tactic