public bpl.Expr guardWithExistConst(bpl.Expr expr)
{
var existsConst = new bpl.Constant(bpl.Token.NoToken, new bpl.TypedIdent(bpl.Token.NoToken, existsConstName + (numExistsConst++), bpl.Type.Bool));
existsConsts.Add(existsConst);
return(bpl.NAryExpr.Imp(new bpl.IdentifierExpr(bpl.Token.NoToken, existsConst), expr));
}
/// <summary>
/// Creates a fresh BPL variable to represent <paramref name="type"/>, deciding
/// on its type based on the heap representation. I.e., the value of this
/// variable represents the value of the expression "typeof(type)".
/// </summary>
public Bpl.Variable CreateTypeVariable(ITypeReference type, List <Bpl.ConstantParent> parents)
{
string typename = TypeHelper.GetTypeName(type, NameFormattingOptions.DocumentationId);
typename = TranslationHelper.TurnStringIntoValidIdentifier(typename);
Bpl.IToken tok = type.Token();
Bpl.TypedIdent tident = new Bpl.TypedIdent(tok, typename, this.TypeType);
Bpl.Constant v = new Bpl.Constant(tok, tident, true /*unique*/, parents, false, null);
return(v);
}
public bpl.Declaration getExistConstDeclaration(bpl.Variable vbl)
{
var res = new bpl.Constant(bpl.Token.NoToken, new bpl.TypedIdent(bpl.Token.NoToken, vbl.Name, vbl.TypedIdent.Type), false);
var paramList = new List <object>();
paramList.Add(new bpl.LiteralExpr(bpl.Token.NoToken, true));
var attr = new bpl.QKeyValue(bpl.Token.NoToken, existsConstAttr, paramList, null);
attr.Next = res.Attributes;
res.Attributes = attr;
return(res);
}
private void trackPhonePageNameVariableName(ITypeDefinition typeDef)
{
if (PhoneCodeHelper.instance().PhonePlugin != null && typeDef.isPhoneApplicationPageClass(sink.host))
{
INamespaceTypeDefinition namedTypeDef = typeDef as INamespaceTypeDefinition;
string fullyQualifiedName = namedTypeDef.ToString();
string xamlForClass = PhoneCodeHelper.instance().getXAMLForPage(fullyQualifiedName);
if (xamlForClass != null) // if not it is possibly an abstract page
{
string uriName = UriHelper.getURIBase(xamlForClass);
Bpl.Constant uriConstant = sink.FindOrCreateConstant(uriName);
PhoneCodeHelper.instance().setBoogieStringPageNameForPageClass(fullyQualifiedName, uriConstant.Name);
}
}
}
public override Bpl.Variable CreateEventVariable(IEventDefinition e)
{
Bpl.Variable v;
string fieldname = MemberHelper.GetMemberSignature(e, NameFormattingOptions.DocumentationId);
fieldname = TranslationHelper.TurnStringIntoValidIdentifier(fieldname);
Bpl.IToken tok = e.Token();
if (e.Adder.ResolvedMethod.IsStatic)
{
Bpl.Type t = this.sink.CciTypeToBoogie(e.Type.ResolvedType);
Bpl.TypedIdent tident = new Bpl.TypedIdent(tok, fieldname, t);
v = new Bpl.GlobalVariable(tok, tident);
}
else
{
Bpl.Type t = this.FieldType;
Bpl.TypedIdent tident = new Bpl.TypedIdent(tok, fieldname, t);
v = new Bpl.Constant(tok, tident, true);
}
return(v);
}
public virtual Constant VisitConstant(Constant node) {
Contract.Requires(node != null);
Contract.Ensures(Contract.Result<Constant>() != null);
return node;
}
// Generate the axiom ensuring that the sub-dags underneath unique
// child-parent edges are all disjoint
private VCExpr GenUniqueParentConstraint(Constant child, Constant parent) {
Contract.Requires(child != null);
Contract.Requires(parent != null);
Contract.Requires(child.TypedIdent.Type.Equals(parent.TypedIdent.Type));
Contract.Ensures(Contract.Result<VCExpr>() != null);
VCExprVar w = Gen.Variable("w", child.TypedIdent.Type);
Contract.Assert(w != null);
VCExpr antecedent =
Gen.AtMost(w, Translator.LookupVariable(child));
Contract.Assert(antecedent != null);
VCExpr succedent =
Gen.Eq(Gen.Function(OneStepFunFor(child.TypedIdent.Type),
Translator.LookupVariable(parent), w),
Translator.LookupVariable(child));
Contract.Assert(succedent != null);
return Gen.Forall(w,
Gen.Trigger(true, antecedent),
Gen.Implies(antecedent, succedent));
}
// Generate axioms that state that all direct children of c are
// specified; this is the dual of the axiom stating that all direct
// ancestors of a constant are known
private VCExpr GenCompleteChildrenConstraints(Constant c) {
Contract.Requires(c != null);
Contract.Requires(c.ChildrenComplete);
Contract.Ensures(Contract.Result<VCExpr>() != null);
VCExprVar cAsVar = Translator.LookupVariable(c);
VCExprVar w = Gen.Variable("w", c.TypedIdent.Type);
VCExpr maxDescendants = Gen.Eq(cAsVar, w);
foreach (Constant d in Constants) {
Contract.Assert(d != null);
if (d.Parents != null && d.Parents.Any(p => c.Equals(p.Parent.Decl)))
maxDescendants = Gen.Or(maxDescendants,
Gen.AtMost(w, Translator.LookupVariable(d)));
}
VCExpr antecedent = Gen.AtMost(w, cAsVar);
Contract.Assert(antecedent != null);
return Gen.Forall(w,
Gen.Trigger(true, antecedent),
Gen.Implies(antecedent, maxDescendants));
}
// Generate the constraints telling that parents of a constant are
// strictly greater than the constant itself, and are the minimal
// elements with this property
private VCExpr GenParentConstraints(Constant c) {
Contract.Requires(c != null);
Contract.Ensures(Contract.Result<VCExpr>() != null);
VCExpr res = VCExpressionGenerator.True;
if (c.Parents == null)
return res;
VCExprVar cAsVar = Translator.LookupVariable(c);
VCExprVar w = Gen.Variable("w", c.TypedIdent.Type);
// Parents of c are proper ancestors of c
foreach (ConstantParent p in c.Parents) {
Contract.Assert(p != null);
VCExprVar par = Translator.LookupVariable(cce.NonNull(p.Parent.Decl));
res = Gen.AndSimp(res, Gen.Neq(cAsVar, par));
res = Gen.AndSimp(res, Gen.AtMost(cAsVar, par));
}
// Parents are direct ancestors of c (no other elements are in
// between c and a parent)
foreach (ConstantParent p in c.Parents) {
Contract.Assert(p != null);
VCExprVar par = Translator.LookupVariable(cce.NonNull(p.Parent.Decl));
Contract.Assert(par != null);
VCExpr antecedent1 = Gen.AtMost(cAsVar, w);
Contract.Assert(antecedent1 != null);
VCExpr antecedent2 = Gen.AtMost(w, par);
Contract.Assert(antecedent2 != null);
VCExpr body = Gen.Implies(Gen.And(antecedent1, antecedent2),
Gen.Or(Gen.Eq(cAsVar, w), Gen.Eq(par, w)));
Contract.Assert(body != null);
res = Gen.AndSimp(res,
Gen.Forall(w,
Gen.Trigger(true, antecedent1, antecedent2),
body));
}
// Ancestors of c are only c itself and the ancestors of the
// parents of c
VCExpr minAncestors = Gen.Eq(cAsVar, w);
Contract.Assert(minAncestors != null);
foreach (ConstantParent p in c.Parents) {
Contract.Assert(p != null);
minAncestors =
Gen.Or(minAncestors,
Gen.AtMost(Translator.LookupVariable(cce.NonNull(p.Parent.Decl)), w));
}
VCExpr antecedent = Gen.AtMost(cAsVar, w);
Contract.Assert(antecedent != null);
res = Gen.AndSimp(res,
Gen.Forall(w,
Gen.Trigger(true, antecedent),
Gen.Implies(antecedent, minAncestors)));
// Constraints for unique child-parent edges
foreach (ConstantParent p in c.Parents) {
Contract.Assert(p != null);
if (p.Unique)
res =
Gen.AndSimp(res,
GenUniqueParentConstraint(c, cce.NonNull((Constant)p.Parent.Decl)));
}
return res;
}
////////////////////////////////////////////////////////////////////////////
public void AddConstant(Constant c) {
Contract.Requires(c != null);
AddAxiom(GenParentConstraints(c));
Constants.Add(c);
if (c.ChildrenComplete)
CompleteConstantsOpen.Add(c);
// ensure that no further children are added to closed
// children-complete constants
Contract.Assert(!(c.Parents != null && Contract.Exists(c.Parents, p => cce.NonNull((Constant)p.Parent.Decl).ChildrenComplete && !CompleteConstantsOpen.Contains((Constant)p.Parent.Decl))));
}
public LazyInliningInfo(Implementation impl, Program program, ProverContext ctxt, int uniqueId, GlobalVariable errorVariable)
{
Contract.Requires(impl != null);
Contract.Requires(program != null);
Procedure proc = cce.NonNull(impl.Proc);
this.impl = impl;
this.uniqueId = uniqueId;
this.controlFlowVariable = new LocalVariable(Token.NoToken, new TypedIdent(Token.NoToken, "cfc", Microsoft.Boogie.Type.Int));
impl.LocVars.Add(controlFlowVariable);
List<Variable> interfaceVars = new List<Variable>();
Expr assertExpr = new LiteralExpr(Token.NoToken, true);
Contract.Assert(assertExpr != null);
foreach (Variable v in program.GlobalVariables())
{
Contract.Assert(v != null);
interfaceVars.Add(v);
if (v.Name == "error")
inputErrorVariable = v;
}
// InParams must be obtained from impl and not proc
foreach (Variable v in impl.InParams)
{
Contract.Assert(v != null);
interfaceVars.Add(v);
}
// OutParams must be obtained from impl and not proc
foreach (Variable v in impl.OutParams)
{
Contract.Assert(v != null);
Constant c = new Constant(Token.NoToken,
new TypedIdent(Token.NoToken, impl.Name + "_" + v.Name, v.TypedIdent.Type));
interfaceVars.Add(c);
Expr eqExpr = Expr.Eq(new IdentifierExpr(Token.NoToken, c), new IdentifierExpr(Token.NoToken, v));
assertExpr = Expr.And(assertExpr, eqExpr);
}
if (errorVariable != null)
{
proc.Modifies.Add(new IdentifierExpr(Token.NoToken, errorVariable));
}
foreach (IdentifierExpr e in proc.Modifies)
{
Contract.Assert(e != null);
if (e.Decl == null)
continue;
Variable v = e.Decl;
Constant c = new Constant(Token.NoToken, new TypedIdent(Token.NoToken, impl.Name + "_" + v.Name, v.TypedIdent.Type));
interfaceVars.Add(c);
if (v.Name == "error")
{
outputErrorVariable = c;
continue;
}
Expr eqExpr = Expr.Eq(new IdentifierExpr(Token.NoToken, c), new IdentifierExpr(Token.NoToken, v));
assertExpr = Expr.And(assertExpr, eqExpr);
}
this.interfaceVars = interfaceVars;
this.assertExpr = Expr.Not(assertExpr);
List<Variable> functionInterfaceVars = new List<Variable>();
foreach (Variable v in interfaceVars)
{
Contract.Assert(v != null);
functionInterfaceVars.Add(new Formal(Token.NoToken, new TypedIdent(Token.NoToken, v.Name, v.TypedIdent.Type), true));
}
TypedIdent ti = new TypedIdent(Token.NoToken, "", Microsoft.Boogie.Type.Bool);
Contract.Assert(ti != null);
Formal returnVar = new Formal(Token.NoToken, ti, false);
Contract.Assert(returnVar != null);
this.function = new Function(Token.NoToken, proc.Name, functionInterfaceVars, returnVar);
ctxt.DeclareFunction(this.function, "");
interfaceVarCopies = new List<List<Variable>>();
int temp = 0;
for (int i = 0; i < /* CommandLineOptions.Clo.ProcedureCopyBound */ 0; i++)
{
interfaceVarCopies.Add(new List<Variable>());
foreach (Variable v in interfaceVars)
{
Constant constant = new Constant(Token.NoToken, new TypedIdent(Token.NoToken, v.Name + temp++, v.TypedIdent.Type));
interfaceVarCopies[i].Add(constant);
//program.TopLevelDeclarations.Add(constant);
}
}
}
public Constant MakeExistentialBoolean(int StageId) {
Constant ExistentialBooleanConstant = new Constant(Token.NoToken, new TypedIdent(tok, "_b" + invariantGenerationCounter, Microsoft.Boogie.Type.Bool), false);
invariantGenerationCounter++;
ExistentialBooleanConstant.AddAttribute("existential", new object[] { Expr.True });
ExistentialBooleanConstant.AddAttribute("stage_id", new object[] { new LiteralExpr(Token.NoToken, Microsoft.Basetypes.BigNum.FromInt(StageId)) });
TopLevelDeclarations.Add(ExistentialBooleanConstant);
return ExistentialBooleanConstant;
}
public virtual void DeclareConstant(Constant c, bool uniq, string attributes)
{
Contract.Requires(c != null); ProcessDeclaration(c);
}
public override Constant VisitConstant(Constant node)
{
Contract.Ensures(Contract.Result<Constant>() == node);
return node;
}
public override Constant VisitConstant(Constant node)
{
node.tok = Token.NoToken;
TokenCount++;
return base.VisitConstant(node);
}
public override Bpl.Variable CreateEventVariable(IEventDefinition e) {
Bpl.Variable v;
string fieldname = MemberHelper.GetMemberSignature(e, NameFormattingOptions.DocumentationId);
fieldname = TranslationHelper.TurnStringIntoValidIdentifier(fieldname);
Bpl.IToken tok = e.Token();
if (e.Adder.ResolvedMethod.IsStatic) {
Bpl.Type t = this.sink.CciTypeToBoogie(e.Type.ResolvedType);
Bpl.TypedIdent tident = new Bpl.TypedIdent(tok, fieldname, t);
v = new Bpl.GlobalVariable(tok, tident);
}
else {
Bpl.Type t = this.FieldType;
Bpl.TypedIdent tident = new Bpl.TypedIdent(tok, fieldname, t);
v = new Bpl.Constant(tok, tident, true);
}
return v;
}
private static void CreateDispatchMethod(Sink sink, ITypeDefinition type, HashSet <IMethodDefinition> delegates)
{
Contract.Assert(type.IsDelegate);
IMethodDefinition invokeMethod = null;
foreach (IMethodDefinition m in type.Methods)
{
if (m.Name.Value == "Invoke")
{
invokeMethod = m;
break;
}
}
try {
IMethodDefinition unspecializedInvokeMethod = Sink.Unspecialize(invokeMethod).ResolvedMethod;
Sink.ProcedureInfo invokeProcedureInfo = sink.FindOrCreateProcedure(unspecializedInvokeMethod);
Bpl.Procedure invokeProcedure = (Bpl.Procedure)invokeProcedureInfo.Decl;
invokeProcedure.AddAttribute("inline", Bpl.Expr.Literal(1));
Bpl.Formal delegateVariable = invokeProcedureInfo.ThisVariable;
Bpl.IToken token = invokeMethod.Token();
List <Bpl.Variable> dispatchProcInExprs = new List <Bpl.Variable>();
for (int i = 1; i < invokeProcedure.InParams.Count; i++)
{
Bpl.Variable v = invokeProcedure.InParams[i];
dispatchProcInExprs.Add(v);
}
List <Bpl.Variable> dispatchProcOutExprs = new List <Bpl.Variable>();
foreach (Bpl.Variable v in invokeProcedure.OutParams)
{
dispatchProcOutExprs.Add(v);
}
List <Bpl.Variable> localVariables = new List <Bpl.Variable>();
Bpl.StmtListBuilder stmtBuilder = new Bpl.StmtListBuilder();
int localCounter = 0;
foreach (IMethodDefinition defn in delegates)
{
Bpl.Constant c = sink.FindOrCreateDelegateMethodConstant(defn);
Sink.ProcedureInfo delegateProcedureInfo = sink.FindOrCreateProcedure(defn);
Bpl.Procedure delegateProcedure = (Bpl.Procedure)delegateProcedureInfo.Decl;
Bpl.Formal thisVariable = delegateProcedureInfo.ThisVariable;
int numArguments = defn.ParameterCount;
List <Bpl.Variable> tempInputs = new List <Bpl.Variable>();
List <Bpl.Variable> tempOutputs = new List <Bpl.Variable>();
for (int i = 0; i < defn.ParameterCount; i++)
{
Bpl.Variable v = delegateProcedure.InParams[(thisVariable == null ? 0 : 1) + i];
Bpl.LocalVariable localVariable = new Bpl.LocalVariable(Bpl.Token.NoToken,
new Bpl.TypedIdent(Bpl.Token.NoToken, "local" + localCounter++, v.TypedIdent.Type));
localVariables.Add(localVariable);
tempInputs.Add(localVariable);
}
for (int i = 0; i < delegateProcedure.OutParams.Count; i++)
{
Bpl.Variable v = delegateProcedure.OutParams[i];
Bpl.LocalVariable localVariable = new Bpl.LocalVariable(Bpl.Token.NoToken,
new Bpl.TypedIdent(Bpl.Token.NoToken, "local" + localCounter++, v.TypedIdent.Type));
localVariables.Add(localVariable);
tempOutputs.Add(localVariable);
}
List <Bpl.Expr> ins = new List <Bpl.Expr>();
List <Bpl.IdentifierExpr> outs = new List <Bpl.IdentifierExpr>();
if (!defn.IsStatic)
{
ins.Add(sink.ReadReceiver(Bpl.Expr.Ident(c), Bpl.Expr.Ident(delegateVariable)));
}
for (int i = 0; i < tempInputs.Count; i++)
{
ins.Add(Bpl.Expr.Ident(tempInputs[i]));
}
if (defn.IsGeneric)
{
for (int i = 0; i < defn.GenericParameterCount; i++)
{
ins.Add(new Bpl.NAryExpr(Bpl.Token.NoToken,
new Bpl.FunctionCall(sink.FindOrCreateTypeParameterFunction(i)),
new List <Bpl.Expr>(new Bpl.Expr[] { sink.ReadTypeParameters(Bpl.Expr.Ident(c), Bpl.Expr.Ident(delegateVariable)) })));
}
}
if (defn.IsStatic)
{
int numTypeParameters = Sink.ConsolidatedGenericParameterCount(defn.ContainingType);
for (int i = 0; i < numTypeParameters; i++)
{
ins.Add(new Bpl.NAryExpr(Bpl.Token.NoToken,
new Bpl.FunctionCall(sink.FindOrCreateTypeParameterFunction(i)),
new List <Bpl.Expr>(new Bpl.Expr[] { sink.ReadTypeParameters(Bpl.Expr.Ident(c), Bpl.Expr.Ident(delegateVariable)) })));
}
}
for (int i = 0; i < tempOutputs.Count; i++)
{
outs.Add(Bpl.Expr.Ident(tempOutputs[i]));
}
Bpl.Expr bexpr = sink.ReadMethod(Bpl.Expr.Ident(c), Bpl.Expr.Ident(delegateVariable));
Bpl.StmtListBuilder ifStmtBuilder = new Bpl.StmtListBuilder();
System.Diagnostics.Debug.Assert(tempInputs.Count == dispatchProcInExprs.Count);
if (tempInputs.Count > 0)
{
BuildAssignment(sink, ifStmtBuilder, tempInputs, dispatchProcInExprs);
}
ifStmtBuilder.Add(EmitDummySourceContext());
ifStmtBuilder.Add(new Bpl.CallCmd(token, delegateProcedure.Name, ins, outs));
System.Diagnostics.Debug.Assert(tempOutputs.Count == dispatchProcOutExprs.Count);
if (tempOutputs.Count > 0)
{
BuildAssignment(sink, ifStmtBuilder, dispatchProcOutExprs, tempOutputs);
}
stmtBuilder.Add(new Bpl.IfCmd(bexpr.tok, bexpr, ifStmtBuilder.Collect(bexpr.tok), null, null));
}
Bpl.Implementation dispatchImpl =
new Bpl.Implementation(token,
invokeProcedure.Name,
new List <Bpl.TypeVariable>(),
invokeProcedure.InParams,
invokeProcedure.OutParams,
localVariables,
stmtBuilder.Collect(token)
);
dispatchImpl.Proc = invokeProcedure;
dispatchImpl.AddAttribute("inline", Bpl.Expr.Literal(1));
sink.TranslatedProgram.AddTopLevelDeclaration(dispatchImpl);
} catch (TranslationException te) {
throw new NotImplementedException(te.ToString());
} catch {
throw;
} finally {
// Maybe this is a good place to add the procedure to the toplevel declarations
}
}
public override void DeclareConstant(Constant c, bool uniq, string attributes)
{
//Contract.Requires(c != null);
base.DeclareConstant(c, uniq, attributes);
orderingAxiomBuilder.AddConstant(c);
// TODO: make separate distinct lists for names coming from different types
// e.g., one for strings, one for ints, one for program types.
if (uniq){
distincts.Add(c);
}
}
/// <summary>
/// Creates a fresh BPL variable to represent <paramref name="type"/>, deciding
/// on its type based on the heap representation. I.e., the value of this
/// variable represents the value of the expression "typeof(type)".
/// </summary>
public Bpl.Variable CreateTypeVariable(ITypeReference type, List<Bpl.ConstantParent> parents)
{
string typename = TypeHelper.GetTypeName(type, NameFormattingOptions.DocumentationId);
typename = TranslationHelper.TurnStringIntoValidIdentifier(typename);
Bpl.IToken tok = type.Token();
Bpl.TypedIdent tident = new Bpl.TypedIdent(tok, typename, this.TypeType);
Bpl.Constant v = new Bpl.Constant(tok, tident, true /*unique*/, parents, false, null);
return v;
}
public override Constant VisitConstant(Constant node) {
//Contract.Requires(node != null);
Contract.Ensures(Contract.Result<Constant>() != null);
return base.VisitConstant((Constant)node.Clone());
}
private Tuple<Variable, Variable> createNewExplainConstants(Variable v)
{
Contract.Assert(impl != null);
Contract.Assert(CommandLineOptions.Clo.ExplainHoudini);
Variable v1 = new Constant(Token.NoToken, new TypedIdent(Token.NoToken, string.Format("{0}_{1}_{2}", v.Name, impl.Name, "pos"), Microsoft.Boogie.BasicType.Bool));
Variable v2 = new Constant(Token.NoToken, new TypedIdent(Token.NoToken, string.Format("{0}_{1}_{2}", v.Name, impl.Name, "neg"), Microsoft.Boogie.BasicType.Bool));
return Tuple.Create(v1, v2);
}
