mirrors/z3
3
0
Fork 0
mirror of https://github.com/Z3Prover/z3 synced 2025-04-08 18:31:49 +00:00
Code Activity

add .NET interface and finish C interface for optimization

Browse source 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2013-12-03 20:20:24 -08:00
parent 9e2908c3f5
commit e3fe80fd4d
5 changed files with 261 additions and 32 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

18
src/api/api_opt.cpp
View file

@ -147,14 +147,24 @@ extern "C" {
// get lower value or current approximation
Z3_ast Z3_API Z3_optimize_get_lower(Z3_context c, Z3_optimize o, unsigned idx) {
NOT_IMPLEMENTED_YET();
return 0;
Z3_TRY;
LOG_Z3_optimize_get_lower(c, o, idx);
RESET_ERROR_CODE();
expr_ref e = to_optimize_ref(o).get_lower(idx);
mk_c(c)->save_ast_trail(e);
RETURN_Z3(of_expr(e));
Z3_CATCH_RETURN(0);
}
// get upper or current approximation
Z3_ast Z3_API Z3_optimize_get_upper(Z3_context c, Z3_optimize o, unsigned idx) {
NOT_IMPLEMENTED_YET();
return 0;
Z3_TRY;
LOG_Z3_optimize_get_upper(c, o, idx);
RESET_ERROR_CODE();
expr_ref e = to_optimize_ref(o).get_upper(idx);
mk_c(c)->save_ast_trail(e);
RETURN_Z3(of_expr(e));
Z3_CATCH_RETURN(0);
}
#if 0

16
src/api/dotnet/Context.cs
View file

@ -3466,6 +3466,18 @@ namespace Microsoft.Z3
}
#endregion
#region Optimization
/// <summary>
/// Create an Optimization context.
/// </summary>
public Optimize MkOptimize()
{
Contract.Ensures(Contract.Result<Optimize>() != null);
return new Optimize(this);
}
#endregion
#region Miscellaneous
/// <summary>
@ -3639,6 +3651,7 @@ namespace Microsoft.Z3
Contract.Invariant(m_Statistics_DRQ != null);
Contract.Invariant(m_Tactic_DRQ != null);
Contract.Invariant(m_Fixedpoint_DRQ != null);
Contract.Invariant(m_Optimize_DRQ != null);
}
readonly private AST.DecRefQueue m_AST_DRQ = new AST.DecRefQueue();
@ -3656,6 +3669,7 @@ namespace Microsoft.Z3
readonly private Statistics.DecRefQueue m_Statistics_DRQ = new Statistics.DecRefQueue();
readonly private Tactic.DecRefQueue m_Tactic_DRQ = new Tactic.DecRefQueue();
readonly private Fixedpoint.DecRefQueue m_Fixedpoint_DRQ = new Fixedpoint.DecRefQueue();
readonly private Optimize.DecRefQueue m_Optimize_DRQ = new Optimize.DecRefQueue();
internal AST.DecRefQueue AST_DRQ { get { Contract.Ensures(Contract.Result<AST.DecRefQueue>() != null); return m_AST_DRQ; } }
internal ASTMap.DecRefQueue ASTMap_DRQ { get { Contract.Ensures(Contract.Result<ASTMap.DecRefQueue>() != null); return m_ASTMap_DRQ; } }
@ -3672,6 +3686,7 @@ namespace Microsoft.Z3
internal Statistics.DecRefQueue Statistics_DRQ { get { Contract.Ensures(Contract.Result<Statistics.DecRefQueue>() != null); return m_Statistics_DRQ; } }
internal Tactic.DecRefQueue Tactic_DRQ { get { Contract.Ensures(Contract.Result<Tactic.DecRefQueue>() != null); return m_Tactic_DRQ; } }
internal Fixedpoint.DecRefQueue Fixedpoint_DRQ { get { Contract.Ensures(Contract.Result<Fixedpoint.DecRefQueue>() != null); return m_Fixedpoint_DRQ; } }
internal Optimize.DecRefQueue Optimize_DRQ { get { Contract.Ensures(Contract.Result<Optimize.DecRefQueue>() != null); return m_Optimize_DRQ; } }
internal uint refCount = 0;
@ -3715,6 +3730,7 @@ namespace Microsoft.Z3
Statistics_DRQ.Clear(this);
Tactic_DRQ.Clear(this);
Fixedpoint_DRQ.Clear(this);
Optimize_DRQ.Clear(this);
m_boolSort = null;
m_intSort = null;

166
src/api/dotnet/Optimize.cs Normal file
View file

@ -0,0 +1,166 @@
/*++
Copyright (c) 2012 Microsoft Corporation
Module Name:
Optimize.cs
Abstract:
Z3 Managed API: Optimizes
Author:
Nikolaj Bjorner (nbjorner) 2013-12-03
Notes:
--*/
using System;
using System.Diagnostics.Contracts;
namespace Microsoft.Z3
{
/// <summary>
/// Object for managing optimizization context
/// </summary>
[ContractVerification(true)]
public class Optimize : Z3Object
{
#if false
/// <summary>
/// A string that describes all available optimize solver parameters.
/// </summary>
public string Help
{
get
{
Contract.Ensures(Contract.Result<string>() != null);
return Native.Z3_optimize_get_help(Context.nCtx, NativeObject);
}
}
#endif
/// <summary>
/// Sets the optimize solver parameters.
/// </summary>
public Params Parameters
{
set
{
Contract.Requires(value != null);
Context.CheckContextMatch(value);
Native.Z3_optimize_set_params(Context.nCtx, NativeObject, value.NativeObject);
}
}
/// <summary>
/// Retrieves parameter descriptions for Optimize solver.
/// </summary>
public ParamDescrs ParameterDescriptions
{
get { return new ParamDescrs(Context, Native.Z3_optimize_get_param_descrs(Context.nCtx, NativeObject)); }
}
/// <summary>
/// Assert a constraint (or multiple) into the optimize solver.
/// </summary>
public void Assert(params BoolExpr[] constraints)
{
Contract.Requires(constraints != null);
Contract.Requires(Contract.ForAll(constraints, c => c != null));
Context.CheckContextMatch(constraints);
foreach (BoolExpr a in constraints)
{
Native.Z3_optimize_assert(Context.nCtx, NativeObject, a.NativeObject);
}
}
/// <summary>
/// Alias for Assert.
/// </summary>
public void Add(params BoolExpr[] constraints)
{
Assert(constraints);
}
/// <summary>
/// Assert soft constraint
/// </summary>
public void AssertSoft(BoolExpr constraint, uint weight, string group)
{
Context.CheckContextMatch(constraint);
Symbol s = Context.MkSymbol(group);
Native.Z3_optimize_assert_soft(Context.nCtx, NativeObject, constraint.NativeObject, weight.ToString(), s.NativeObject);
}
public Status Check() {
Z3_lbool r = (Z3_lbool)Native.Z3_optimize_check(Context.nCtx, NativeObject);
switch (r)
{
case Z3_lbool.Z3_L_TRUE: return Status.SATISFIABLE;
case Z3_lbool.Z3_L_FALSE: return Status.UNSATISFIABLE;
default: return Status.UNKNOWN;
}
}
public void Maximize(ArithExpr e) {
Native.Z3_optimize_maximize(Context.nCtx, NativeObject, e.NativeObject);
}
public void Minimize(ArithExpr e) {
Native.Z3_optimize_minimize(Context.nCtx, NativeObject, e.NativeObject);
}
public ArithExpr GetLower(uint index) {
return new ArithExpr(Context, Native.Z3_optimize_get_lower(Context.nCtx, NativeObject, index));
}
public ArithExpr GetUpper(uint index) {
return new ArithExpr(Context, Native.Z3_optimize_get_upper(Context.nCtx, NativeObject, index));
}
#region Internal
internal Optimize(Context ctx, IntPtr obj)
: base(ctx, obj)
{
Contract.Requires(ctx != null);
}
internal Optimize(Context ctx)
: base(ctx, Native.Z3_mk_optimize(ctx.nCtx))
{
Contract.Requires(ctx != null);
}
internal class DecRefQueue : IDecRefQueue
{
public override void IncRef(Context ctx, IntPtr obj)
{
Native.Z3_optimize_inc_ref(ctx.nCtx, obj);
}
public override void DecRef(Context ctx, IntPtr obj)
{
Native.Z3_optimize_dec_ref(ctx.nCtx, obj);
}
};
internal override void IncRef(IntPtr o)
{
Context.Optimize_DRQ.IncAndClear(Context, o);
base.IncRef(o);
}
internal override void DecRef(IntPtr o)
{
Context.Optimize_DRQ.Add(o);
base.DecRef(o);
}
#endregion
}
}

81
src/opt/opt_context.cpp
View file

@ -21,6 +21,7 @@ Notes:
#include "ast_pp.h"
#include "opt_solver.h"
#include "opt_params.hpp"
#include "arith_decl_plugin.h"
namespace opt {
@ -52,8 +53,10 @@ namespace opt {
}
void context::add_objective(app* t, bool is_max) {
app_ref tr(m);
m_objectives.push_back(objective(is_max, tr));
app_ref tr(t, m);
unsigned index = m_optsmt.get_num_objectives();
m_optsmt.add(t, is_max);
m_objectives.push_back(objective(is_max, tr, index));
}
lbool context::optimize() {
@ -79,27 +82,26 @@ namespace opt {
}
}
lbool context::execute_min_max(app* obj, bool committed, bool is_max) {
// HACK: reuse m_optsmt but add only a single objective each round
m_optsmt.add(obj, is_max);
lbool context::execute_min_max(unsigned index, bool committed, bool is_max) {
// HACK: reuse m_optsmt without regard for box reuse and not considering
// use-case of lex.
lbool result = m_optsmt(get_solver());
if (committed) m_optsmt.commit_assignment(0);
if (committed) m_optsmt.commit_assignment(index);
return result;
}
lbool context::execute_maxsat(symbol const& id, bool committed) {
maxsmt* ms;
VERIFY(m_maxsmts.find(id, ms));
lbool result = (*ms)(get_solver());
if (committed) ms->commit_assignment();
maxsmt& ms = *m_maxsmts.find(id);
lbool result = ms(get_solver());
if (committed) ms.commit_assignment();
return result;
}
lbool context::execute(objective const& obj, bool committed) {
switch(obj.m_type) {
case O_MAXIMIZE: return execute_min_max(obj.m_term, committed, true);
case O_MINIMIZE: return execute_min_max(obj.m_term, committed, false);
case O_MAXIMIZE: return execute_min_max(obj.m_index, committed, true);
case O_MINIMIZE: return execute_min_max(obj.m_index, committed, false);
case O_MAXSMT: return execute_maxsat(obj.m_id, committed);
default: UNREACHABLE(); return l_undef;
}
@ -181,28 +183,59 @@ namespace opt {
}
expr_ref context::get_lower(unsigned idx) {
NOT_IMPLEMENTED_YET();
if (idx > m_objectives.size()) {
throw default_exception("index out of bounds");
}
objective const& obj = m_objectives[idx];
switch(obj.m_type) {
case O_MAXSMT: {
maxsmt* ms = m_maxsmts.find(obj.m_id);
inf_eps l = ms->get_lower();
break;
}
case O_MAXIMIZE:
case O_MAXSMT:
return to_expr(m_maxsmts.find(obj.m_id)->get_lower());
case O_MINIMIZE:
break;
case O_MAXIMIZE:
return to_expr(m_optsmt.get_lower(obj.m_index));
default:
UNREACHABLE();
return expr_ref(m);
}
return expr_ref(0,m);
}
expr_ref context::get_upper(unsigned idx) {
NOT_IMPLEMENTED_YET();
return expr_ref(0, m);
if (idx > m_objectives.size()) {
throw default_exception("index out of bounds");
}
objective const& obj = m_objectives[idx];
switch(obj.m_type) {
case O_MAXSMT:
return to_expr(m_maxsmts.find(obj.m_id)->get_upper());
case O_MINIMIZE:
case O_MAXIMIZE:
return to_expr(m_optsmt.get_upper(obj.m_index));
default:
UNREACHABLE();
return expr_ref(m);
}
}
expr_ref context::to_expr(inf_eps const& n) {
rational inf = n.get_infinity();
rational r = n.get_rational();
rational eps = n.get_infinitesimal();
expr_ref_vector args(m);
arith_util a(m);
if (!inf.is_zero()) {
args.push_back(a.mk_mul(a.mk_numeral(inf, inf.is_int()), m.mk_const(symbol("oo"), a.mk_int())));
}
if (!r.is_zero()) {
args.push_back(a.mk_numeral(r, r.is_int()));
}
if (!eps.is_zero()) {
args.push_back(a.mk_mul(a.mk_numeral(eps, eps.is_int()), m.mk_const(symbol("epsilon"), a.mk_int())));
}
switch(args.size()) {
case 0: return expr_ref(a.mk_numeral(rational(0), true), m);
case 1: return expr_ref(args[0].get(), m);
default: return expr_ref(a.mk_add(args.size(), args.c_ptr()), m);
}
}
void context::set_cancel(bool f) {

12
src/opt/opt_context.h
View file

@ -45,15 +45,18 @@ namespace opt {
objective_t m_type;
app_ref m_term; // for maximize, minimize
symbol m_id; // for maxsmt
objective(bool is_max, app_ref& t):
unsigned m_index;
objective(bool is_max, app_ref& t, unsigned idx):
m_type(is_max?O_MAXIMIZE:O_MINIMIZE),
m_term(t),
m_id()
m_id(),
m_index(idx)
{}
objective(ast_manager& m, symbol id):
m_type(O_MAXSMT),
m_term(m),
m_id(id)
m_id(id),
m_index(0)
{}
};
ast_manager& m;
@ -88,11 +91,12 @@ namespace opt {
void validate_feasibility(maxsmt& ms);
lbool execute(objective const& obj, bool committed);
lbool execute_min_max(app* obj, bool committed, bool is_max);
lbool execute_min_max(unsigned index, bool committed, bool is_max);
lbool execute_maxsat(symbol const& s, bool committed);
lbool execute_lex();
lbool execute_box();
lbool execute_pareto();
expr_ref to_expr(inf_eps const& n);
void push();
void pop(unsigned sz);