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 8299 of file z3py.py.

Constructor & Destructor Documentation

def __init__ (   self,
  tactic,
  ctx = None 
)

Definition at line 8307 of file z3py.py.

8307  def __init__(self, tactic, ctx=None):
8308  self.ctx = _get_ctx(ctx)
8309  self.tactic = None
8310  if isinstance(tactic, TacticObj):
8311  self.tactic = tactic
8312  else:
8313  if z3_debug():
8314  _z3_assert(isinstance(tactic, str), "tactic name expected")
8315  try:
8316  self.tactic = Z3_mk_tactic(self.ctx.ref(), str(tactic))
8317  except Z3Exception:
8318  raise Z3Exception("unknown tactic '%s'" % tactic)
8319  Z3_tactic_inc_ref(self.ctx.ref(), self.tactic)
8320 
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:8307
def z3_debug()
Definition: z3py.py:62
def __del__ (   self)

Definition at line 8324 of file z3py.py.

8324  def __del__(self):
8325  if self.tactic is not None and self.ctx.ref() is not None and Z3_tactic_dec_ref is not None:
8326  Z3_tactic_dec_ref(self.ctx.ref(), self.tactic)
8327 
def __del__(self)
Definition: z3py.py:8324
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 8362 of file z3py.py.

8362  def __call__(self, goal, *arguments, **keywords):
8363  """Apply tactic `self` to the given goal or Z3 Boolean expression using the given options.
8364 
8365  >>> x, y = Ints('x y')
8366  >>> t = Tactic('solve-eqs')
8367  >>> t(And(x == 0, y >= x + 1))
8368  [[y >= 1]]
8369  """
8370  return self.apply(goal, *arguments, **keywords)
8371 
def apply(self, goal, arguments, keywords)
Definition: z3py.py:8345
def __call__(self, goal, arguments, keywords)
Definition: z3py.py:8362
def __deepcopy__ (   self,
  memo = {} 
)

Definition at line 8321 of file z3py.py.

8321  def __deepcopy__(self, memo={}):
8322  return Tactic(self.tactic, self.ctx)
8323 
def __deepcopy__
Definition: z3py.py:8321
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 8345 of file z3py.py.

Referenced by Tactic.__call__().

8345  def apply(self, goal, *arguments, **keywords):
8346  """Apply tactic `self` to the given goal or Z3 Boolean expression using the given options.
8347 
8348  >>> x, y = Ints('x y')
8349  >>> t = Tactic('solve-eqs')
8350  >>> t.apply(And(x == 0, y >= x + 1))
8351  [[y >= 1]]
8352  """
8353  if z3_debug():
8354  _z3_assert(isinstance(goal, (Goal, BoolRef)), "Z3 Goal or Boolean expressions expected")
8355  goal = _to_goal(goal)
8356  if len(arguments) > 0 or len(keywords) > 0:
8357  p = args2params(arguments, keywords, self.ctx)
8358  return ApplyResult(Z3_tactic_apply_ex(self.ctx.ref(), self.tactic, goal.goal, p.params), self.ctx)
8359  else:
8360  return ApplyResult(Z3_tactic_apply(self.ctx.ref(), self.tactic, goal.goal), self.ctx)
8361 
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:5512
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:8345
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 8372 of file z3py.py.

8372  def help(self):
8373  """Display a string containing a description of the available options for the `self` tactic."""
8374  print(Z3_tactic_get_help(self.ctx.ref(), self.tactic))
8375 
def help(self)
Definition: z3py.py:8372
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 8376 of file z3py.py.

8376  def param_descrs(self):
8377  """Return the parameter description set."""
8378  return ParamDescrsRef(Z3_tactic_get_param_descrs(self.ctx.ref(), self.tactic), self.ctx)
8379 
8380 
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:8376
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 8328 of file z3py.py.

8328  def solver(self, logFile=None):
8329  """Create a solver using the tactic `self`.
8330 
8331  The solver supports the methods `push()` and `pop()`, but it
8332  will always solve each `check()` from scratch.
8333 
8334  >>> t = Then('simplify', 'nlsat')
8335  >>> s = t.solver()
8336  >>> x = Real('x')
8337  >>> s.add(x**2 == 2, x > 0)
8338  >>> s.check()
8339  sat
8340  >>> s.model()
8341  [x = 1.4142135623?]
8342  """
8343  return Solver(Z3_mk_solver_from_tactic(self.ctx.ref(), self.tactic), self.ctx, logFile)
8344 
def solver
Definition: z3py.py:8328
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