mirrors/z3
3
0
Fork 0
mirror of https://github.com/Z3Prover/z3 synced 2025-04-23 09:05:31 +00:00
Code Activity

expose bounds as vector expressions instead of containing ad-hoc expressions. Issue #911

Browse source 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2017-02-24 11:07:40 -08:00
parent e744d0f271
commit e02160c674
11 changed files with 158 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

28
src/api/api_opt.cpp
View file

@ -218,6 +218,34 @@ extern "C" {
Z3_CATCH_RETURN(0);
}
// get lower value or current approximation
Z3_ast_vector Z3_API Z3_optimize_get_lower_as_vector(Z3_context c, Z3_optimize o, unsigned idx) {
Z3_TRY;
LOG_Z3_optimize_get_lower_as_vector(c, o, idx);
RESET_ERROR_CODE();
expr_ref_vector es(mk_c(c)->m());
to_optimize_ptr(o)->get_lower(idx, es);
Z3_ast_vector_ref * v = alloc(Z3_ast_vector_ref, *mk_c(c), mk_c(c)->m());
mk_c(c)->save_object(v);
v->m_ast_vector.append(es.size(), (ast*const*)es.c_ptr());
RETURN_Z3(of_ast_vector(v));
Z3_CATCH_RETURN(0);
}
// get upper or current approximation
Z3_ast_vector Z3_API Z3_optimize_get_upper_as_vector(Z3_context c, Z3_optimize o, unsigned idx) {
Z3_TRY;
LOG_Z3_optimize_get_upper_as_vector(c, o, idx);
RESET_ERROR_CODE();
expr_ref_vector es(mk_c(c)->m());
to_optimize_ptr(o)->get_upper(idx, es);
Z3_ast_vector_ref * v = alloc(Z3_ast_vector_ref, *mk_c(c), mk_c(c)->m());
mk_c(c)->save_object(v);
v->m_ast_vector.append(es.size(), (ast*const*)es.c_ptr());
RETURN_Z3(of_ast_vector(v));
Z3_CATCH_RETURN(0);
}
Z3_string Z3_API Z3_optimize_to_string(Z3_context c, Z3_optimize o) {
Z3_TRY;
LOG_Z3_optimize_to_string(c, o);

36
src/api/dotnet/Optimize.cs
View file

@ -144,6 +144,23 @@ namespace Microsoft.Z3
{
get { return Lower; }
}
/// <summary>
/// Retrieve a lower bound for the objective handle.
/// </summary>
public ArithExpr[] LowerAsVector
{
get { return opt.GetLowerAsVector(handle); }
}
/// <summary>
/// Retrieve an upper bound for the objective handle.
/// </summary>
public ArithExpr[] UpperAsVector
{
get { return opt.GetUpperAsVector(handle); }
}
}
/// <summary>
@ -255,6 +272,25 @@ namespace Microsoft.Z3
return (ArithExpr)Expr.Create(Context, Native.Z3_optimize_get_upper(Context.nCtx, NativeObject, index));
}
/// <summary>
/// Retrieve a lower bound for the objective handle.
/// </summary>
private ArithExpr[] GetLowerAsVector(uint index)
{
ASTVector v = new ASTVector(Context, Native.Z3_optimize_get_lower_as_vector(Context.nCtx, NativeObject, index));
return v.ToArithExprArray();
}
/// <summary>
/// Retrieve an upper bound for the objective handle.
/// </summary>
private ArithExpr[] GetUpperAsVector(uint index)
{
ASTVector v = new ASTVector(Context, Native.Z3_optimize_get_upper_as_vector(Context.nCtx, NativeObject, index));
return v.ToArithExprArray();
}
/// <summary>
/// Return a string the describes why the last to check returned unknown
/// </summary>

22
src/api/python/z3/z3.py
View file

@ -6719,12 +6719,24 @@ class OptimizeObjective:
opt = self._opt
return _to_expr_ref(Z3_optimize_get_upper(opt.ctx.ref(), opt.optimize, self._value), opt.ctx)
def lower_values(self):
opt = self._opt
return AstVector(Z3_optimize_get_lower_as_vector(opt.ctx.ref(), opt.optimize, self._value), opt.ctx)
def upper_values(self):
opt = self._opt
return AstVector(Z3_optimize_get_upper_as_vector(opt.ctx.ref(), opt.optimize, self._value), opt.ctx)
def value(self):
if self._is_max:
return self.upper()
else:
return self.lower()
def __str__(self):
return "%s:%s" % (self._value, self._is_max)
class Optimize(Z3PPObject):
"""Optimize API provides methods for solving using objective functions and weighted soft constraints"""
@ -6829,6 +6841,16 @@ class Optimize(Z3PPObject):
raise Z3Exception("Expecting objective handle returned by maximize/minimize")
return obj.upper()
def lower_values(self, obj):
if not isinstance(obj, OptimizeObjective):
raise Z3Exception("Expecting objective handle returned by maximize/minimize")
return obj.lower_values()
def upper_values(self, obj):
if not isinstance(obj, OptimizeObjective):
raise Z3Exception("Expecting objective handle returned by maximize/minimize")
return obj.upper_values()
def from_file(self, filename):
"""Parse assertions and objectives from a file"""
Z3_optimize_from_file(self.ctx.ref(), self.optimize, filename)

27
src/api/z3_optimization.h
View file

@ -186,6 +186,33 @@ extern "C" {
*/
Z3_ast Z3_API Z3_optimize_get_upper(Z3_context c, Z3_optimize o, unsigned idx);
/**
\brief Retrieve lower bound value or approximation for the i'th optimization objective.
The returned vector is of length 3. It always contains numerals.
The three numerals are coefficients a, b, c and encode the result of \c Z3_optimize_get_lower
a * infinity + b + c * epsilon.
\param c - context
\param o - optimization context
\param idx - index of optimization objective
def_API('Z3_optimize_get_lower_as_vector', AST_VECTOR, (_in(CONTEXT), _in(OPTIMIZE), _in(UINT)))
*/
Z3_ast_vector Z3_API Z3_optimize_get_lower_as_vector(Z3_context c, Z3_optimize o, unsigned idx);
/**
\brief Retrieve upper bound value or approximation for the i'th optimization objective.
\param c - context
\param o - optimization context
\param idx - index of optimization objective
def_API('Z3_optimize_get_upper_as_vector', AST_VECTOR, (_in(CONTEXT), _in(OPTIMIZE), _in(UINT)))
*/
Z3_ast_vector Z3_API Z3_optimize_get_upper_as_vector(Z3_context c, Z3_optimize o, unsigned idx);
/**
\brief Print the current context as a string.
\param c - context.