private bool OnlyRefersToConstants(Expr e)
{
VariableCollector vc = new VariableCollector();
vc.Visit(e);
return(vc.usedVars.OfType <Constant>().Count() == vc.usedVars.Count());
}
private IEnumerable <VariableDescriptor> GetReferencedVariables(Absy node, string proc)
{
var VarCollector = new VariableCollector();
VarCollector.Visit(node);
return(VarCollector.usedVars.Where(Item => VariableRelevantToAnalysis(Item, proc)).
Select(Item => MakeDescriptor(proc, Item)));
}
public override Expr VisitIdentifierExpr(IdentifierExpr node)
{
VariableCollector vc = new VariableCollector();
vc.Visit(node);
var existConsts = vc.usedVars.Where(x => QKeyValue.FindBoolAttribute(x.Attributes, "existential"));
existConsts.Iter(x => usedExistentialConstants.Add(x));
return(base.VisitIdentifierExpr(node));
}
private void MergeIgnoredAnnotations()
{
var IgnoredAnnotationsToVariables = new Dictionary <string, HashSet <Variable> >();
foreach (var c in AllAnnotationIdentifiers())
{
IgnoredAnnotationsToVariables[c] = new HashSet <Variable>();
}
foreach (var ci in AnnotationInstances())
{
if (!IgnoredAnnotationsToVariables.ContainsKey(ci.AnnotationIdentifier))
{
continue;
}
VariableCollector vc = new VariableCollector();
vc.Visit(ci.Expr);
if (vc.usedVars.Select(Item => varDepAnalyser.VariableRelevantToAnalysis(Item, ci.Proc)).Count() != 0)
{
continue;
}
foreach (var v in vc.usedVars)
{
if (varDepAnalyser.Ignoring(v, ci.Proc))
{
IgnoredAnnotationsToVariables[ci.AnnotationIdentifier].Add(v);
}
}
}
foreach (var c in IgnoredAnnotationsToVariables.Keys)
{
foreach (var d in IgnoredAnnotationsToVariables.Keys)
{
if (c == d)
{
continue;
}
if (IgnoredAnnotationsToVariables[c].Equals(IgnoredAnnotationsToVariables[d]))
{
AnnotationDependences.AddEdge(c, d);
}
}
}
}
public Tuple <string, IEnumerable <LemmaDecl> > GenerateTactic(Expr e)
{
var varCollector = new VariableCollector();
varCollector.Visit(e);
var lookupTyThms = new List <string>();
var funMemThms = new List <string>();
foreach (var v in varCollector.usedVars)
{
try
{
lookupTyThms.Add(programAccessor.LookupVarTyLemma(v));
}
catch
{
//variable not found, possible if, for example, v is bound
}
}
var usedFuncs = functionCollector.UsedFunctions(e);
foreach (var f in usedFuncs)
{
funMemThms.Add(programAccessor.MembershipLemma(f));
}
var hintLemmas = equalityHintGenerator.GetHints(e);
var hintsML = MLUtil.IsaToMLThms(hintLemmas.Select(lemma => lemma.Name));
var lookupTyML = MLUtil.IsaToMLThms(lookupTyThms);
var funMemML = MLUtil.IsaToMLThms(funMemThms);
var args = new List <string>
{
MLUtil.ContextAntiquotation(),
hintsML,
lookupTyML,
funMemML
};
var tactic = ProofUtil.Apply(ProofUtil.MLTactic("typing_tac " + string.Join(" ", args), 1));
return(Tuple.Create(tactic, hintLemmas));
}
private HashSet <VariableDescriptor> UsedVars(Expr e)
{
VariableCollector vc = new VariableCollector();
vc.Visit(e);
HashSet <VariableDescriptor> result = new HashSet <VariableDescriptor>();
foreach (var v in vc.usedVars)
{
var vd = MakeDescriptor(v);
if (vd != null)
{
result.Add(vd);
}
}
return(result);
}
public override Expr VisitNAryExpr(NAryExpr node)
{
if (node.Fun is FunctionCall)
{
var collector = new VariableCollector();
collector.Visit(node);
if (existentialExpr != null && existentialExpr.Dummies.Intersect(collector.usedVars).Any())
{
functionsUsed.Add(Tuple.Create((node.Fun as FunctionCall).Func, existentialExpr));
}
else
{
functionsUsed.Add(Tuple.Create <Function, ExistsExpr>((node.Fun as FunctionCall).Func, null));
}
}
return(base.VisitNAryExpr(node));
}
private static void PropagateCall(CallCmd cc, HashSet <Variable> liveVarsAfter, Program program)
{
// globals U in-params U (after - out-params)
cc.Outs.Where(ie => ie != null).Iter(ie => liveVarsAfter.Remove(ie.Decl));
if (program != null)
{
program.TopLevelDeclarations
.OfType <GlobalVariable>()
.Iter(v => liveVarsAfter.Add(v));
}
VariableCollector /*!*/ collector = new VariableCollector();
cc.Ins.Where(e => e != null).Iter(e => collector.Visit(e));
if (program == null)
{
liveVarsAfter.UnionWith(collector.usedVars.Where(v => v is LocalVariable || v is Formal));
}
else
{
liveVarsAfter.UnionWith(collector.usedVars);
}
}
private static void UpdateLiveSet(Cmd cmd, HashSet <Variable> liveVars)
{
if (cmd is AssignCmd assignCmd)
{
foreach (var lhs in assignCmd.Lhss)
{
liveVars.Remove(lhs.DeepAssignedVariable);
}
foreach (var rhs in assignCmd.Rhss)
{
var collector = new VariableCollector();
collector.Visit(rhs);
//we neglect that the corresponding lhs may be dead
liveVars.UnionWith(collector.usedVars);
}
}
else if (cmd is HavocCmd havocCmd)
{
foreach (var ie in havocCmd.Vars)
{
liveVars.Remove(ie.Decl);
}
}
else if (cmd is PredicateCmd predicateCmd)
{
//live set is not cleared when reaching "assert false" or "assume false"
var collector = new VariableCollector();
collector.Visit(predicateCmd.Expr);
liveVars.UnionWith(collector.usedVars);
}
else
{
throw new ProofGenUnexpectedStateException(
"Unsupported command in program right before passification.");
}
}
public AtomicActionInfo(Procedure proc, Ensures ensures, MoverType moverType, int layerNum, int availableUptoLayerNum)
: base(proc, layerNum, availableUptoLayerNum)
{
this.ensures = ensures;
this.moverType = moverType;
this.gate = new List <AssertCmd>();
this.action = ensures.Condition as CodeExpr;
this.thisGate = new List <AssertCmd>();
this.thisInParams = new List <Variable>();
this.thisOutParams = new List <Variable>();
this.thatGate = new List <AssertCmd>();
this.thatInParams = new List <Variable>();
this.thatOutParams = new List <Variable>();
this.hasAssumeCmd = false;
this.thisMap = new Dictionary <Variable, Expr>();
this.thatMap = new Dictionary <Variable, Expr>();
foreach (Block block in this.action.Blocks)
{
block.Cmds.ForEach(x => this.hasAssumeCmd = this.hasAssumeCmd || x is AssumeCmd);
}
foreach (Block block in this.action.Blocks)
{
if (block.TransferCmd is ReturnExprCmd)
{
block.TransferCmd = new ReturnCmd(block.TransferCmd.tok);
}
}
var cmds = this.action.Blocks[0].Cmds;
for (int i = 0; i < cmds.Count; i++)
{
AssertCmd assertCmd = cmds[i] as AssertCmd;
if (assertCmd == null)
{
break;
}
this.gate.Add(assertCmd);
cmds[i] = new AssumeCmd(assertCmd.tok, Expr.True);
}
foreach (Variable x in proc.InParams)
{
Variable thisx = new Formal(Token.NoToken, new TypedIdent(Token.NoToken, "this_" + x.Name, x.TypedIdent.Type), true, x.Attributes);
this.thisInParams.Add(thisx);
this.thisMap[x] = Expr.Ident(thisx);
Variable thatx = new Formal(Token.NoToken, new TypedIdent(Token.NoToken, "that_" + x.Name, x.TypedIdent.Type), true, x.Attributes);
this.thatInParams.Add(thatx);
this.thatMap[x] = Expr.Ident(thatx);
}
foreach (Variable x in proc.OutParams)
{
Variable thisx = new Formal(Token.NoToken, new TypedIdent(Token.NoToken, "this_" + x.Name, x.TypedIdent.Type), false, x.Attributes);
this.thisOutParams.Add(thisx);
this.thisMap[x] = Expr.Ident(thisx);
Variable thatx = new Formal(Token.NoToken, new TypedIdent(Token.NoToken, "that_" + x.Name, x.TypedIdent.Type), false, x.Attributes);
this.thatOutParams.Add(thatx);
this.thatMap[x] = Expr.Ident(thatx);
}
List <Variable> thisLocVars = new List <Variable>();
List <Variable> thatLocVars = new List <Variable>();
foreach (Variable x in this.action.LocVars)
{
Variable thisx = new Formal(Token.NoToken, new TypedIdent(Token.NoToken, "this_" + x.Name, x.TypedIdent.Type), false);
thisMap[x] = Expr.Ident(thisx);
thisLocVars.Add(thisx);
Variable thatx = new Formal(Token.NoToken, new TypedIdent(Token.NoToken, "that_" + x.Name, x.TypedIdent.Type), false);
thatMap[x] = Expr.Ident(thatx);
thatLocVars.Add(thatx);
}
Contract.Assume(proc.TypeParameters.Count == 0);
Substitution thisSubst = Substituter.SubstitutionFromHashtable(this.thisMap);
Substitution thatSubst = Substituter.SubstitutionFromHashtable(this.thatMap);
foreach (AssertCmd assertCmd in this.gate)
{
this.thisGate.Add((AssertCmd)Substituter.Apply(thisSubst, assertCmd));
this.thatGate.Add((AssertCmd)Substituter.Apply(thatSubst, assertCmd));
}
this.thisAction = new CodeExpr(thisLocVars, SubstituteBlocks(this.action.Blocks, thisSubst, "this_"));
this.thatAction = new CodeExpr(thatLocVars, SubstituteBlocks(this.action.Blocks, thatSubst, "that_"));
{
VariableCollector collector = new VariableCollector();
collector.Visit(this.action);
this.actionUsedGlobalVars = new HashSet <Variable>(collector.usedVars.Where(x => x is GlobalVariable));
}
List <Variable> modifiedVars = new List <Variable>();
foreach (Block block in this.action.Blocks)
{
block.Cmds.ForEach(cmd => cmd.AddAssignedVariables(modifiedVars));
}
this.modifiedGlobalVars = new HashSet <Variable>(modifiedVars.Where(x => x is GlobalVariable));
{
VariableCollector collector = new VariableCollector();
this.gate.ForEach(assertCmd => collector.Visit(assertCmd));
this.gateUsedGlobalVars = new HashSet <Variable>(collector.usedVars.Where(x => x is GlobalVariable));
}
}
private void MergeIgnoredCandidates()
{
var IgnoredCandidatesToVariables = new Dictionary<string, HashSet<Variable>>();
foreach(var c in candidates) {
IgnoredCandidatesToVariables[c] = new HashSet<Variable>();
}
foreach(var ci in CandidateInstances()) {
if(!IgnoredCandidatesToVariables.ContainsKey(ci.Candidate)) {
continue;
}
VariableCollector vc = new VariableCollector();
vc.Visit(ci.Expr);
if(vc.usedVars.Select(Item => varDepAnalyser.VariableRelevantToAnalysis(Item, ci.Proc)).Count() != 0) {
continue;
}
foreach(var v in vc.usedVars) {
if(varDepAnalyser.Ignoring(v, ci.Proc)) {
IgnoredCandidatesToVariables[ci.Candidate].Add(v);
}
}
}
foreach(var c in IgnoredCandidatesToVariables.Keys) {
foreach(var d in IgnoredCandidatesToVariables.Keys) {
if(c == d) {
continue;
}
if(IgnoredCandidatesToVariables[c].Equals(IgnoredCandidatesToVariables[d])) {
CandidateDependences.AddEdge(c, d);
}
}
}
}
// perform in place update of liveSet
public static void Propagate(Cmd cmd, HashSet <Variable /*!*/> /*!*/ liveSet, bool allGlobalsAreLive)
{
Contract.Requires(cmd != null);
Contract.Requires(cce.NonNullElements(liveSet));
if (cmd is AssignCmd)
{
AssignCmd /*!*/ assignCmd = (AssignCmd)cce.NonNull(cmd);
// I must first iterate over all the targets and remove the live ones.
// After the removals are done, I must add the variables referred on
// the right side of the removed targets
AssignCmd simpleAssignCmd = assignCmd.AsSimpleAssignCmd;
HashSet <int> indexSet = new HashSet <int>();
int index = 0;
foreach (AssignLhs /*!*/ lhs in simpleAssignCmd.Lhss)
{
Contract.Assert(lhs != null);
SimpleAssignLhs salhs = lhs as SimpleAssignLhs;
Contract.Assert(salhs != null);
Variable var = salhs.DeepAssignedVariable;
if (var != null && (liveSet.Contains(var) || (allGlobalsAreLive && var is GlobalVariable)))
{
indexSet.Add(index);
liveSet.Remove(var);
}
index++;
}
index = 0;
foreach (Expr /*!*/ expr in simpleAssignCmd.Rhss)
{
Contract.Assert(expr != null);
if (indexSet.Contains(index))
{
VariableCollector /*!*/ collector = new VariableCollector();
collector.Visit(expr);
if (allGlobalsAreLive)
{
liveSet.UnionWith(collector.usedVars.Where(v => v is LocalVariable || v is Formal));
}
else
{
liveSet.UnionWith(collector.usedVars);
}
}
index++;
}
}
else if (cmd is HavocCmd)
{
HavocCmd /*!*/ havocCmd = (HavocCmd)cmd;
foreach (IdentifierExpr /*!*/ expr in havocCmd.Vars)
{
Contract.Assert(expr != null);
if (expr.Decl != null)
{
liveSet.Remove(expr.Decl);
}
}
}
else if (cmd is PredicateCmd)
{
Contract.Assert((cmd is AssertCmd || cmd is AssumeCmd));
PredicateCmd /*!*/ predicateCmd = (PredicateCmd)cce.NonNull(cmd);
if (predicateCmd.Expr is LiteralExpr)
{
LiteralExpr le = (LiteralExpr)predicateCmd.Expr;
if (le.IsFalse)
{
liveSet.Clear();
}
}
else
{
VariableCollector /*!*/ collector = new VariableCollector();
collector.Visit(predicateCmd.Expr);
if (allGlobalsAreLive)
{
liveSet.UnionWith(collector.usedVars.Where(v => v is LocalVariable || v is Formal));
}
else
{
liveSet.UnionWith(collector.usedVars);
}
}
}
else if (cmd is CommentCmd)
{
// comments are just for debugging and don't affect verification
}
else if (cmd is SugaredCmd)
{
SugaredCmd /*!*/ sugCmd = (SugaredCmd)cce.NonNull(cmd);
Propagate(sugCmd.Desugaring, liveSet, allGlobalsAreLive);
}
else if (cmd is StateCmd)
{
StateCmd /*!*/ stCmd = (StateCmd)cce.NonNull(cmd);
List <Cmd> /*!*/ cmds = cce.NonNull(stCmd.Cmds);
int len = cmds.Count;
for (int i = len - 1; i >= 0; i--)
{
Propagate(cmds[i], liveSet, allGlobalsAreLive);
}
foreach (Variable /*!*/ v in stCmd.Locals)
{
Contract.Assert(v != null);
liveSet.Remove(v);
}
}
else
{
{
Contract.Assert(false);
throw new cce.UnreachableException();
}
}
}
public AtomicActionInfo(Procedure proc, Ensures ensures, MoverType moverType, int layerNum, int availableUptoLayerNum)
: base(proc, layerNum, availableUptoLayerNum)
{
CodeExpr codeExpr = ensures.Condition as CodeExpr;
this.ensures = ensures;
this.moverType = moverType;
this.thisGate = new List <AssertCmd>();
this.thisAction = codeExpr;
this.thisInParams = new List <Variable>();
this.thisOutParams = new List <Variable>();
this.thatGate = new List <AssertCmd>();
this.thatInParams = new List <Variable>();
this.thatOutParams = new List <Variable>();
this.hasAssumeCmd = false;
foreach (Block block in codeExpr.Blocks)
{
block.Cmds.ForEach(x => this.hasAssumeCmd = this.hasAssumeCmd || x is AssumeCmd);
}
var cmds = thisAction.Blocks[0].Cmds;
for (int i = 0; i < cmds.Count; i++)
{
AssertCmd assertCmd = cmds[i] as AssertCmd;
if (assertCmd == null)
{
break;
}
thisGate.Add(assertCmd);
cmds[i] = new AssumeCmd(assertCmd.tok, Expr.True);
}
Dictionary <Variable, Expr> map = new Dictionary <Variable, Expr>();
foreach (Variable x in proc.InParams)
{
this.thisInParams.Add(x);
Variable y = new Formal(Token.NoToken, new TypedIdent(Token.NoToken, "that_" + x.Name, x.TypedIdent.Type), true, x.Attributes);
this.thatInParams.Add(y);
map[x] = Expr.Ident(y);
}
foreach (Variable x in proc.OutParams)
{
this.thisOutParams.Add(x);
Variable y = new Formal(Token.NoToken, new TypedIdent(Token.NoToken, "that_" + x.Name, x.TypedIdent.Type), false, x.Attributes);
this.thatOutParams.Add(y);
map[x] = Expr.Ident(y);
}
List <Variable> thatLocVars = new List <Variable>();
foreach (Variable x in thisAction.LocVars)
{
Variable y = new Formal(Token.NoToken, new TypedIdent(Token.NoToken, "that_" + x.Name, x.TypedIdent.Type), false);
map[x] = Expr.Ident(y);
thatLocVars.Add(y);
}
Contract.Assume(proc.TypeParameters.Count == 0);
Substitution subst = Substituter.SubstitutionFromHashtable(map);
foreach (AssertCmd assertCmd in thisGate)
{
thatGate.Add((AssertCmd)Substituter.Apply(subst, assertCmd));
}
Dictionary <Block, Block> blockMap = new Dictionary <Block, Block>();
List <Block> thatBlocks = new List <Block>();
foreach (Block block in thisAction.Blocks)
{
List <Cmd> otherCmds = new List <Cmd>();
foreach (Cmd cmd in block.Cmds)
{
otherCmds.Add(Substituter.Apply(subst, cmd));
}
Block thatBlock = new Block();
thatBlock.Cmds = otherCmds;
thatBlock.Label = "that_" + block.Label;
block.Label = "this_" + block.Label;
thatBlocks.Add(thatBlock);
blockMap[block] = thatBlock;
if (block.TransferCmd is GotoCmd)
{
GotoCmd gotoCmd = block.TransferCmd as GotoCmd;
for (int i = 0; i < gotoCmd.labelNames.Count; i++)
{
gotoCmd.labelNames[i] = "this_" + gotoCmd.labelNames[i];
}
}
}
foreach (Block block in thisAction.Blocks)
{
if (block.TransferCmd is ReturnExprCmd)
{
block.TransferCmd = new ReturnCmd(block.TransferCmd.tok);
blockMap[block].TransferCmd = new ReturnCmd(block.TransferCmd.tok);
continue;
}
List <Block> thatGotoCmdLabelTargets = new List <Block>();
List <string> thatGotoCmdLabelNames = new List <string>();
GotoCmd gotoCmd = block.TransferCmd as GotoCmd;
foreach (Block target in gotoCmd.labelTargets)
{
thatGotoCmdLabelTargets.Add(blockMap[target]);
thatGotoCmdLabelNames.Add(blockMap[target].Label);
}
blockMap[block].TransferCmd = new GotoCmd(block.TransferCmd.tok, thatGotoCmdLabelNames, thatGotoCmdLabelTargets);
}
this.thatAction = new CodeExpr(thatLocVars, thatBlocks);
{
VariableCollector collector = new VariableCollector();
collector.Visit(codeExpr);
this.actionUsedGlobalVars = new HashSet <Variable>(collector.usedVars.Where(x => x is GlobalVariable));
}
List <Variable> modifiedVars = new List <Variable>();
foreach (Block block in codeExpr.Blocks)
{
block.Cmds.ForEach(cmd => cmd.AddAssignedVariables(modifiedVars));
}
this.modifiedGlobalVars = new HashSet <Variable>(modifiedVars.Where(x => x is GlobalVariable));
{
VariableCollector collector = new VariableCollector();
this.thisGate.ForEach(assertCmd => collector.Visit(assertCmd));
this.gateUsedGlobalVars = new HashSet <Variable>(collector.usedVars.Where(x => x is GlobalVariable));
}
}
private bool OnlyRefersToConstants(Expr e) {
VariableCollector vc = new VariableCollector();
vc.Visit(e);
return vc.usedVars.OfType<Constant>().Count() == vc.usedVars.Count();
}