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//-----------------------------------------------------------------------------
//
// Copyright (C) Microsoft Corporation. All Rights Reserved.
//
//-----------------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics.Contracts;
using System.IO;
using System.Text.RegularExpressions;
namespace Microsoft.Boogie.SMTLib
{
class Z3
{
static string _proverPath;
static string CodebaseString()
{
Contract.Ensures(Contract.Result<string>() != null);
return Path.GetDirectoryName(cce.NonNull(System.Reflection.Assembly.GetExecutingAssembly().Location));
}
public static string ExecutablePath()
{
if (_proverPath == null)
FindExecutable();
return _proverPath;
}
static void FindExecutable()
// throws ProverException, System.IO.FileNotFoundException;
{
Contract.Ensures(_proverPath != null);
// Command line option 'z3exe' always has priority if set
if (CommandLineOptions.Clo.Z3ExecutablePath != null) {
_proverPath = CommandLineOptions.Clo.Z3ExecutablePath;
if (!File.Exists(_proverPath)) {
throw new ProverException("Cannot find prover specified with z3exe: " + _proverPath);
}
if (CommandLineOptions.Clo.Trace) {
Console.WriteLine("[TRACE] Using prover: " + _proverPath);
}
return;
}
var proverExe = "z3.exe";
if (_proverPath == null) {
// Initialize '_proverPath'
_proverPath = Path.Combine(CodebaseString(), proverExe);
string firstTry = _proverPath;
if (File.Exists(firstTry)) {
if (CommandLineOptions.Clo.Trace) {
Console.WriteLine("[TRACE] Using prover: " + _proverPath);
}
return;
}
List<string> z3Dirs = new List<string>();
string programFiles = Environment.GetEnvironmentVariable("ProgramFiles");
if (programFiles != null) {
string programFilesX86 = Environment.GetEnvironmentVariable("ProgramFiles(x86)");
if (programFiles.Equals(programFilesX86)) {
// If both %ProgramFiles% and %ProgramFiles(x86)% point to "ProgramFiles (x86)", use %ProgramW6432% instead.
programFiles = Environment.GetEnvironmentVariable("ProgramW6432");
}
if (Directory.Exists(programFiles + @"\Microsoft Research\")) {
string msrDir = programFiles + @"\Microsoft Research\";
z3Dirs.AddRange(Directory.GetDirectories(msrDir, "Z3-*"));
}
if (Directory.Exists(programFilesX86 + @"\Microsoft Research\")) {
string msrDir = programFilesX86 + @"\Microsoft Research\";
z3Dirs.AddRange(Directory.GetDirectories(msrDir, "Z3-*"));
}
}
int minMajor = 3, minMinor = 2;
// Look for the most recent version of Z3.
int minor = 0, major = 0;
string winner = null;
Regex r = new Regex(@"^Z3-(\d+)\.(\d+)$");
foreach (string d in z3Dirs) {
string name = new DirectoryInfo(d).Name;
foreach (Match m in r.Matches(name)) {
int ma, mi;
ma = int.Parse(m.Groups[1].ToString());
mi = int.Parse(m.Groups[2].ToString());
if (major < ma || (major == ma && minor < mi)) {
major = ma;
minor = mi;
winner = d;
}
}
}
if (major == 0 && minor == 0) {
throw new ProverException("Cannot find executable: " + firstTry);
}
Contract.Assert(winner != null);
_proverPath = Path.Combine(Path.Combine(winner, "bin"), proverExe);
if (!File.Exists(_proverPath)) {
throw new ProverException("Cannot find prover: " + _proverPath);
}
if (CommandLineOptions.Clo.Trace) {
Console.WriteLine("[TRACE] Using prover: " + _proverPath);
}
if (major < minMajor || (major == minMajor && minor < minMinor)) {
throw new ProverException(string.Format("Found version {0}.{1} of Z3. Please install version {2}.{3} or later. " +
"(More conservative users might opt to supply -prover:Z3 option instead to get the historic Simplify back-end)",
major, minor, minMajor, minMinor));
}
}
}
// options that work only on the command line
static string[] commandLineOnly = { "TRACE", "PROOF_MODE" };
public static void SetupOptions(SMTLibProverOptions options)
{
// don't bother with auto-config - it would disable explicit settings for eager threshold and so on
options.AddWeakSmtOption("AUTO_CONFIG", "false");
//options.AddWeakSmtOption("MODEL_PARTIAL", "true");
//options.WeakAddSmtOption("MODEL_VALUE_COMPLETION", "false");
options.AddWeakSmtOption("MODEL_HIDE_UNUSED_PARTITIONS", "false");
options.AddWeakSmtOption("MODEL_V2", "true");
options.AddWeakSmtOption("ASYNC_COMMANDS", "false");
if (!options.OptimizeForBv) {
// Phase selection means to always try the negative literal polarity first, seems to be good for Boogie.
// The restart parameters change the restart behavior to match Z3 v1, which also seems to be good.
options.AddWeakSmtOption("PHASE_SELECTION", "0");
options.AddWeakSmtOption("RESTART_STRATEGY", "0");
options.AddWeakSmtOption("RESTART_FACTOR", "|1.5|");
// Make the integer model more diverse by default, speeds up some benchmarks a lot.
options.AddWeakSmtOption("ARITH_RANDOM_INITIAL_VALUE", "true");
// The left-to-right structural case-splitting strategy.
//options.AddWeakSmtOption("SORT_AND_OR", "false"); // always false now
options.AddWeakSmtOption("CASE_SPLIT", "3");
// In addition delay adding unit conflicts.
options.AddWeakSmtOption("DELAY_UNITS", "true");
options.AddWeakSmtOption("DELAY_UNITS_THRESHOLD", "16");
}
// This is used by VCC, but could be also useful for others, if sk_hack(foo(x)) is included as trigger,
// the foo(x0) will be activated for e-matching when x is skolemized to x0.
options.AddWeakSmtOption("NNF_SK_HACK", "true");
// don't use model-based quantifier instantiation; it never finishes on non-trivial Boogie problems
options.AddWeakSmtOption("MBQI", "false");
// More or less like MAM=0.
options.AddWeakSmtOption("QI_EAGER_THRESHOLD", "100");
// Complex proof attempts in VCC (and likely elsewhere) require matching depth of 20 or more.
// the following will make the :weight option more usable
options.AddWeakSmtOption("QI_COST", "|\"(+ weight generation)\"|");
//if (options.Inspector != null)
// options.WeakAddSmtOption("PROGRESS_SAMPLING_FREQ", "100");
options.AddWeakSmtOption("TYPE_CHECK", "true");
options.AddWeakSmtOption("BV_REFLECT", "true");
if (options.TimeLimit > 0) {
options.AddWeakSmtOption("SOFT_TIMEOUT", options.TimeLimit.ToString());
// This kills the Z3 *instance* after the specified time, not a particular query, so we cannot use it.
// options.AddSolverArgument("/T:" + (options.TimeLimit + 1000) / 1000);
}
if (options.Inspector != null)
options.AddWeakSmtOption("PROGRESS_SAMPLING_FREQ", "200");
// legacy option handling
if (!CommandLineOptions.Clo.z3AtFlag)
options.MultiTraces = true;
foreach (string opt in CommandLineOptions.Clo.Z3Options) {
Contract.Assert(opt != null);
int eq = opt.IndexOf("=");
if (eq > 0 && 'A' <= opt[0] && opt[0] <= 'Z' && !commandLineOnly.Contains(opt.Substring(0, eq))) {
options.AddSmtOption(opt.Substring(0, eq), opt.Substring(eq + 1));
} else {
options.AddSolverArgument(opt);
}
}
}
}
}
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