public void AssumeEqual(ISymValue v1, ISymValue v2)
{
WorkList wl = new WorkList();
SymbolicValue v1rep = Find(v1);
SymbolicValue v2rep = Find(v2);
PushEquality(wl, v1rep, v2rep);
if (!wl.IsEmpty())
{
// TODO: there's an opportunity for optimizing the number
// of necessary updates that we need to record, since the induced
// updates of the equality may end up as duplicates.
AddEqualityUpdate(v1rep, v2rep);
}
DrainEqualityWorkList(wl);
}
private void DrainEqualityWorkList(WorkList wl)
{
while (!wl.IsEmpty())
{
EqPair eqpair = (EqPair)wl.Pull();
SymbolicValue v1rep = Find(eqpair.v1);
SymbolicValue v2rep = Find(eqpair.v2);
if (v1rep == v2rep)
{
continue;
}
// always map new to older var
if (v1rep.UniqueId < v2rep.UniqueId)
{
SymbolicValue temp = v1rep;
v1rep = v2rep;
v2rep = temp;
}
// perform congruence closure here:
foreach (IUniqueKey f in this.Functions(v1rep))
{
SymbolicValue target = this.LookupWithoutManifesting(v2rep, f);
if (target == null)
{
this[v2rep, f] = this[v1rep, f];
}
else
{
PushEquality(wl, this[v1rep, f], target);
}
}
MathematicalLattice.Element av1 = this[v1rep];
MathematicalLattice.Element av2 = this[v2rep];
// merge term map of v1 into v2
foreach (IUniqueKey eterm in this.eqTermMap.Keys2(v1rep))
{
this.eqTermMap = this.eqTermMap.Add(v2rep, eterm, null);
}
this.forwMap = this.forwMap.Add(v1rep, v2rep);
this[v2rep] = this.elementLattice.Meet(av1, av2);
}
}
public void Dump(TextWriter tw)
{
HashSet seen = new HashSet();
WorkList wl = new WorkList();
Console.WriteLine("LastSymbolId:{0}", this.idCounter);
foreach (IUniqueKey function in this.termMap.Keys2(this.constRoot))
{
SymbolicValue target = this[this.constRoot, function];
tw.WriteLine("{0} = {1}", Function2String(function), target);
wl.Add(target);
}
while (!wl.IsEmpty())
{
SymbolicValue v = (SymbolicValue)wl.Pull();
if (!seen.Add(v))
{
continue;
}
foreach (IUniqueKey function in this.termMap.Keys2(v))
{
SymbolicValue target = this[v, function];
tw.WriteLine("{0}({2}) = {1}", Function2String(function), target, v);
wl.Add(target);
}
}
tw.WriteLine("**Abstract value map");
foreach (SymbolicValue v in seen)
{
AbstractValue aval = this[v];
if (!this.elementLattice.IsTop(aval))
{
tw.WriteLine("{0} -> {1}", v, aval);
}
}
}
private void DrainEqualityWorkList(WorkList <EqualityPair <TFunc, TADomain> > workList)
{
while (!workList.IsEmpty())
{
EqualityPair <TFunc, TADomain> equalityPair = workList.Pull();
SymValue sv1 = Find(equalityPair.Sv1);
SymValue sv2 = Find(equalityPair.Sv2);
if (sv1 != sv2)
{
if (sv1.UniqueId < sv2.UniqueId)
{
SymValue tmp = sv1;
sv1 = sv2;
sv2 = tmp;
}
foreach (TFunc function in Functions(sv1))
{
SymValue v2 = LookupWithoutManifesting(sv2, function);
if (v2 == null)
{
this [sv2, function] = this [sv1, function];
}
else
{
TryPushEquality(workList, this [sv1, function], v2);
}
}
TADomain thisValue = this [sv1];
TADomain thatValue = this [sv2];
foreach (var elem in EqualTermsMap[sv1].AsEnumerable())
{
EqualTermsMap = EqualTermsMap.Add(sv2, EqualTermsMap [sv2].Cons(elem));
}
this.forw_map = this.forw_map.Add(sv1, sv2);
this [sv2] = thisValue.Meet(thatValue);
}
}
}
/// <summary>
/// Must follow field edges of value types backwards as well
/// </summary>
public Variable GetLocalMappingToLoc(ISymValue loc) {
WorkList refparams = new WorkList();
WorkList fields = new WorkList();
fields.Add(loc);
while (! fields.IsEmpty()) {
ISymValue sv = (ISymValue)fields.Pull();
foreach (EGraphTerm eterm in egraph.EqTerms(sv)) {
if ( !(eterm.Function is StackVariable)) {
Variable v = eterm.Function as Variable;
if (v != null) {
return v;
}
Field f = eterm.Function as Field;
if (f != null && f.DeclaringType.IsValueType) {
if (eterm.Args.Length>0) {
fields.Add(eterm.Args[0]);
}
}
if (eterm.Function == ValueOf && eterm.Args.Length>0) {
// could be that we are looking at a ref parameter
refparams.Add(eterm.Args[0]);
}
}
}
}
while (! refparams.IsEmpty()) {
ISymValue sv = (ISymValue)refparams.Pull();
foreach (EGraphTerm eterm in egraph.EqTerms(sv)) {
if ( !(eterm.Function is StackVariable)) {
Variable v = eterm.Function as Variable;
if (v != null && (v.Type is Reference || v.Type is Pointer)) {
return v;
}
}
}
}
return null;
}
private static bool InternalLessEqual(SymGraph <TFunc, TADomain> thisG, SymGraph <TFunc, TADomain> thatG,
out IImmutableMap <SymValue, Sequence <SymValue> > forward,
out IImmutableMap <SymValue, SymValue> backward)
{
int updateSize;
SymGraph <TFunc, TADomain> commonTail = ComputeCommonTail(thisG, thatG, out updateSize);
if (thisG.IsImmutable)
{
thisG = thisG.Clone();
}
var workList = new WorkList <EqualityPair <TFunc, TADomain> > ();
workList.Add(new EqualityPair <TFunc, TADomain> (thisG.const_root, thatG.const_root));
IImmutableSet <SymValue> backwardManifested = ImmutableSet <SymValue> .Empty(SymValue.GetUniqueKey);
IImmutableMap <SymValue, SymValue> backwardMap = ImmutableIntKeyMap <SymValue, SymValue> .Empty(SymValue.GetUniqueKey);
IImmutableMap <SymValue, Sequence <SymValue> > forwardMap = ImmutableIntKeyMap <SymValue, Sequence <SymValue> > .Empty(SymValue.GetUniqueKey);
IImmutableMap <SymValue, int> triggers = ImmutableIntKeyMap <SymValue, int> .Empty(SymValue.GetUniqueKey);
while (!workList.IsEmpty())
{
EqualityPair <TFunc, TADomain> equalityPair = workList.Pull();
SymValue sv1 = equalityPair.Sv1;
SymValue sv2 = equalityPair.Sv2;
SymValue s;
if (VisitedBefore(sv2, backwardManifested, backwardMap, out s))
{
if (s != null && s == sv1)
{
continue;
}
if (DebugOptions.Debug)
{
Console.WriteLine("---LessEqual fails due to pre-existing relation: {0} <- {1}", s, sv2);
}
forward = null;
backward = null;
return(false);
}
TADomain val1 = sv1 == null?thisG.UnderlyingTopValue.ForManifestedField() : thisG [sv1];
TADomain val2 = thatG [sv2];
if (!val1.LessEqual(val2))
{
if (DebugOptions.Debug)
{
Console.WriteLine("---LessEqual fails due to abstract values: !({0} <= {1})", val1, val2);
}
forward = null;
backward = null;
return(false);
}
if (sv1 != null)
{
backwardMap = backwardMap.Add(sv2, sv1);
forwardMap = forwardMap.Add(sv1, forwardMap [sv1].Cons(sv2));
}
else
{
backwardManifested = backwardManifested.Add(sv2);
}
if (thisG.HasAllBottomFields(sv1))
{
continue;
}
if (thatG.HasAllBottomFields(sv2))
{
if (DebugOptions.Debug)
{
Console.WriteLine("---LessEqual fails due to bottom field difference");
}
forward = null;
backward = null;
return(false);
}
foreach (TFunc function in thatG.Functions(sv2))
{
SymValue v1 = thisG [function, sv1];
SymValue v2 = thatG [function, sv2];
if (DebugOptions.Debug)
{
Console.WriteLine(" {0}-{1}->{2} <=? {3}-{4}->{5}", sv1, function, v1, sv2, function, v2);
}
workList.Add(new EqualityPair <TFunc, TADomain> (v1, v2));
}
foreach (var e in thatG.MultiEdges(sv2))
{
foreach (SymValue sv in thatG.MultiEdgeMap[sv2, e].AsEnumerable())
{
if (!UpdateTrigger(sv, e, ref triggers))
{
continue;
}
SymGraphTerm <TFunc> term = thatG.EqualMultiTermsMap [sv];
var args = new SymValue[term.Args.Length];
for (int i = 0; i < args.Length; i++)
{
args [i] = backwardMap [term.Args [i]];
}
SymValue v1 = thisG.LookupWithoutManifesting(args, e.Function);
if (v1 == null)
{
if (DebugOptions.Debug)
{
Console.WriteLine("---LessEqual fails due to missing multi term {0}({1})",
e.Function,
string.Join(", ", term.Args.Select(it => it.ToString())));
}
forward = null;
backward = null;
return(false);
}
workList.Add(new EqualityPair <TFunc, TADomain> (v1, sv));
}
}
}
forward = forwardMap;
backward = CompleteWithCommon(backwardMap, thisG, commonTail.IdGenerator);
return(true);
}
public void Dump(TextWriter tw)
{
var set = new HashSet <SymValue> ();
var workList = new WorkList <SymValue> ();
IImmutableMap <SymValue, int> triggers = ImmutableIntKeyMap <SymValue, int> .Empty(SymValue.GetUniqueKey);
tw.WriteLine("EGraphId: {0}", this.egraph_id);
tw.WriteLine("LastSymbolId: {0}", LastSymbolId);
foreach (TFunc function in TermMap.Keys2(this.const_root))
{
SymValue sv = this [this.const_root, function];
tw.WriteLine("{0} = {1}", function, sv);
workList.Add(sv);
}
while (!workList.IsEmpty())
{
SymValue sv = workList.Pull();
if (!set.Add(sv))
{
continue;
}
foreach (TFunc function in TermMap.Keys2(sv))
{
SymValue target = this [sv, function];
tw.WriteLine("{0}({2}) = {1})", function, target, sv);
workList.Add(target);
}
foreach (var edge in MultiEdgeMap.Keys2(sv))
{
foreach (SymValue target in MultiEdgeMap[sv, edge].AsEnumerable())
{
if (!UpdateTrigger(target, edge, ref triggers))
{
continue;
}
SymGraphTerm <TFunc> term = EqualMultiTermsMap [target];
if (term.Args != null)
{
tw.WriteLine("{0}({1}) = {2}",
term.Function,
term.Args.ToString(", "), target);
workList.Add(target);
}
}
}
}
tw.WriteLine("**Abstract value map");
foreach (SymValue sv in set)
{
TADomain abstractValue = this [sv];
if (!abstractValue.IsTop)
{
tw.WriteLine("{0} -> {1}", sv, abstractValue);
}
}
}
private void DrainEqualityWorkList(WorkList wl) {
while ( ! wl.IsEmpty() ) {
EqPair eqpair = (EqPair)wl.Pull();
SymbolicValue v1rep = Find(eqpair.v1);
SymbolicValue v2rep = Find(eqpair.v2);
if (v1rep == v2rep) continue;
// always map new to older var
if (v1rep.UniqueId < v2rep.UniqueId) {
SymbolicValue temp = v1rep;
v1rep = v2rep;
v2rep = temp;
}
// perform congruence closure here:
foreach(IUniqueKey f in this.Functions(v1rep)) {
SymbolicValue target = this.LookupWithoutManifesting(v2rep, f);
if (target == null) {
this[v2rep, f] = this[v1rep,f];
}
else {
PushEquality(wl, this[v1rep,f], target);
}
}
MathematicalLattice.Element av1 = this[v1rep];
MathematicalLattice.Element av2 = this[v2rep];
// merge term map of v1 into v2
foreach(IUniqueKey eterm in this.eqTermMap.Keys2(v1rep)) {
this.eqTermMap = this.eqTermMap.Add(v2rep, eterm, null);
}
this.forwMap = this.forwMap.Add(v1rep, v2rep);
this[v2rep] = this.elementLattice.Meet(av1,av2);
}
}
public void AssumeEqual(ISymValue v1, ISymValue v2) {
WorkList wl = new WorkList();
SymbolicValue v1rep = Find(v1);
SymbolicValue v2rep = Find(v2);
PushEquality(wl, v1rep, v2rep);
if (!wl.IsEmpty()) {
// TODO: there's an opportunity for optimizing the number
// of necessary updates that we need to record, since the induced
// updates of the equality may end up as duplicates.
AddEqualityUpdate(v1rep, v2rep);
}
DrainEqualityWorkList(wl);
}
public void Dump(TextWriter tw) {
HashSet seen = new HashSet();
WorkList wl = new WorkList();
Console.WriteLine("LastSymbolId:{0}", this.idCounter);
foreach(IUniqueKey function in this.termMap.Keys2(this.constRoot)) {
SymbolicValue target = this[this.constRoot, function];
tw.WriteLine("{0} = {1}", Function2String(function), target);
wl.Add(target);
}
while ( ! wl.IsEmpty() ) {
SymbolicValue v = (SymbolicValue)wl.Pull();
if ( ! seen.Add(v)) continue;
foreach(IUniqueKey function in this.termMap.Keys2(v)) {
SymbolicValue target = this[v, function];
tw.WriteLine("{0}({2}) = {1}", Function2String(function), target, v);
wl.Add(target);
}
}
tw.WriteLine("**Abstract value map");
foreach (SymbolicValue v in seen) {
AbstractValue aval = this[v];
if (!this.elementLattice.IsTop(aval)) {
tw.WriteLine("{0} -> {1}", v, aval);
}
}
}