public override Expr VisitCodeExpr(CodeExpr node)
{
//Contract.Requires(node != null);
Contract.Ensures(Contract.Result <Expr>() != null);
CodeExpr clone = (CodeExpr)base.VisitCodeExpr((CodeExpr)node.Clone());
// Before returning, fix up the resolved goto targets
Contract.Assert(node.Blocks.Count == clone.Blocks.Count);
Dictionary <Block, Block> subst = new Dictionary <Block, Block>();
for (int i = 0; i < node.Blocks.Count; i++)
{
subst.Add(node.Blocks[i], clone.Blocks[i]);
}
foreach (Block /*!*/ b in clone.Blocks)
{
Contract.Assert(b != null);
GotoCmd g = b.TransferCmd as GotoCmd;
if (g != null)
{
List <Block> targets = new List <Block>();
foreach (Block t in cce.NonNull(g.labelTargets))
{
Block nt = subst[t];
targets.Add(nt);
}
g.labelTargets = targets;
}
}
return(clone);
}
public override Expr VisitCodeExpr(CodeExpr node)
{
var clone = (CodeExpr)node.Clone();
clone.Blocks = new List <Block>(node.Blocks);
clone.LocVars = new List <Variable>(node.LocVars);
clone = (CodeExpr)base.VisitCodeExpr(clone);
// Before returning, fix up the resolved goto targets
Dictionary <Block, Block> subst = new Dictionary <Block, Block>();
for (int i = 0; i < node.Blocks.Count; i++)
{
subst.Add(node.Blocks[i], clone.Blocks[i]);
}
foreach (Block b in clone.Blocks)
{
GotoCmd g = b.TransferCmd as GotoCmd;
if (g != null)
{
List <Block> targets = new List <Block>();
foreach (Block t in g.labelTargets)
{
Block nt = subst[t];
targets.Add(nt);
}
g.labelTargets = targets;
}
}
return(clone);
}
public override Expr VisitCodeExpr(CodeExpr node)
{
Inliner codeExprInliner = new Inliner(program, inlineCallback, CommandLineOptions.Clo.InlineDepth);
codeExprInliner.newLocalVars.AddRange(node.LocVars);
codeExprInliner.inlinedProcLblMap = this.inlinedProcLblMap;
List<Block> newCodeExprBlocks = codeExprInliner.DoInlineBlocks(node.Blocks, ref inlinedSomething);
return new CodeExpr(codeExprInliner.newLocalVars, newCodeExprBlocks);
}
public virtual Expr VisitCodeExpr(CodeExpr node)
{
Contract.Requires(node != null);
Contract.Ensures(Contract.Result <Expr>() != null);
node.LocVars = this.VisitVariableSeq(node.LocVars);
node.Blocks = this.VisitBlockList(node.Blocks);
return(node);
}
public override Expr VisitCodeExpr(CodeExpr node)
{
Inliner codeExprInliner = new Inliner(program, inlineCallback, CommandLineOptions.Clo.InlineDepth);
codeExprInliner.newLocalVars.AddRange(node.LocVars);
codeExprInliner.inlinedProcLblMap = this.inlinedProcLblMap;
List<Block> newCodeExprBlocks = codeExprInliner.DoInlineBlocks(node.Blocks, ref inlinedSomething);
return new CodeExpr(codeExprInliner.newLocalVars, newCodeExprBlocks);
}
public ModelViewInfo(CodeExpr codeExpr)
{
Contract.Requires(codeExpr != null);
// TODO: also need all variables of enclosing scopes (the global variables of the program, the parameters
// and perhaps locals of the implementation (if any), any enclosing code expressions).
foreach (Variable v in codeExpr.LocVars)
{
AllVariables.Add(v);
}
}
public override Expr VisitCodeExpr(CodeExpr node) {
//Contract.Requires(node != null);
Contract.Ensures(Contract.Result<Expr>() != null);
CodeExpr clone = (CodeExpr)base.VisitCodeExpr((CodeExpr)node.Clone());
// Before returning, fix up the resolved goto targets
Contract.Assert(node.Blocks.Count == clone.Blocks.Count);
Dictionary<Block, Block> subst = new Dictionary<Block, Block>();
for (int i = 0; i < node.Blocks.Count; i++) {
subst.Add(node.Blocks[i], clone.Blocks[i]);
}
foreach (Block/*!*/ b in clone.Blocks) {
Contract.Assert(b != null);
GotoCmd g = b.TransferCmd as GotoCmd;
if (g != null) {
List<Block> targets = new List<Block>();
foreach (Block t in cce.NonNull(g.labelTargets)) {
Block nt = subst[t];
targets.Add(nt);
}
g.labelTargets = targets;
}
}
return clone;
}
public void TypeCheck()
{
foreach (Declaration decl in program.TopLevelDeclarations)
{
Procedure proc = decl as Procedure;
if (proc == null)
{
continue;
}
foreach (Ensures e in proc.Ensures)
{
int phaseNum;
MoverType moverType = MoverCheck.GetMoverType(e, out phaseNum);
if (moverType == MoverType.Top)
{
continue;
}
CodeExpr codeExpr = e.Condition as CodeExpr;
if (codeExpr == null)
{
Error(e, "An atomic action must be a CodeExpr");
continue;
}
if (procToActionInfo.ContainsKey(proc))
{
Error(proc, "A procedure can have at most one atomic action");
continue;
}
procToActionInfo[proc] = new ActionInfo(proc, codeExpr, moverType, phaseNum);
}
}
this.VisitProgram(program);
#if QED
YieldTypeChecker.PerformYieldTypeChecking(this);
#endif
}
public virtual Expr VisitCodeExpr(CodeExpr node) {
Contract.Requires(node != null);
Contract.Ensures(Contract.Result<Expr>() != null);
node.LocVars = this.VisitVariableSeq(node.LocVars);
node.Blocks = this.VisitBlockList(node.Blocks);
return node;
}
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>();
this.triggerFuns = new Dictionary<Variable, Function>();
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));
}
}
void AtomExpression(out Expr/*!*/ e) {
Contract.Ensures(Contract.ValueAtReturn(out e) != null); IToken/*!*/ x; int n; BigNum bn; BigDec bd; BigFloat bf;
List<Expr>/*!*/ es; List<Variable>/*!*/ ds; Trigger trig;
List<TypeVariable>/*!*/ typeParams;
IdentifierExpr/*!*/ id;
QKeyValue kv;
e = dummyExpr;
List<Variable>/*!*/ locals;
List<Block/*!*/>/*!*/ blocks;
switch (la.kind) {
case 83: {
Get();
e = new LiteralExpr(t, false);
break;
}
case 84: {
Get();
e = new LiteralExpr(t, true);
break;
}
case 3: {
Nat(out bn);
e = new LiteralExpr(t, bn);
break;
}
case 5: case 6: {
Dec(out bd);
e = new LiteralExpr(t, bd);
break;
}
case 7: {
Float(out bf);
e = new LiteralExpr(t, bf);
break;
}
case 2: {
BvLit(out bn, out n);
e = new LiteralExpr(t, bn, n);
break;
}
case 1: {
Ident(out x);
id = new IdentifierExpr(x, x.val); e = id;
if (la.kind == 10) {
Get();
if (StartOf(9)) {
Expressions(out es);
e = new NAryExpr(x, new FunctionCall(id), es);
} else if (la.kind == 11) {
e = new NAryExpr(x, new FunctionCall(id), new List<Expr>());
} else SynErr(124);
Expect(11);
}
break;
}
case 85: {
Get();
x = t;
Expect(10);
Expression(out e);
Expect(11);
e = new OldExpr(x, e);
break;
}
case 15: {
Get();
x = t;
Expect(10);
Expression(out e);
Expect(11);
e = new NAryExpr(x, new ArithmeticCoercion(x, ArithmeticCoercion.CoercionType.ToInt), new List<Expr>{ e });
break;
}
case 16: {
Get();
x = t;
Expect(10);
Expression(out e);
Expect(11);
e = new NAryExpr(x, new ArithmeticCoercion(x, ArithmeticCoercion.CoercionType.ToReal), new List<Expr>{ e });
break;
}
case 10: {
Get();
if (StartOf(9)) {
Expression(out e);
if (e is BvBounds)
this.SemErr("parentheses around bitvector bounds " +
"are not allowed");
} else if (la.kind == 89 || la.kind == 90) {
Forall();
x = t;
QuantifierBody(x, out typeParams, out ds, out kv, out trig, out e);
if (typeParams.Count + ds.Count > 0)
e = new ForallExpr(x, typeParams, ds, kv, trig, e);
} else if (la.kind == 91 || la.kind == 92) {
Exists();
x = t;
QuantifierBody(x, out typeParams, out ds, out kv, out trig, out e);
if (typeParams.Count + ds.Count > 0)
e = new ExistsExpr(x, typeParams, ds, kv, trig, e);
} else if (la.kind == 93 || la.kind == 94) {
Lambda();
x = t;
QuantifierBody(x, out typeParams, out ds, out kv, out trig, out e);
if (trig != null)
SemErr("triggers not allowed in lambda expressions");
if (typeParams.Count + ds.Count > 0)
e = new LambdaExpr(x, typeParams, ds, kv, e);
} else SynErr(125);
Expect(11);
break;
}
case 41: {
IfThenElseExpression(out e);
break;
}
case 86: {
CodeExpression(out locals, out blocks);
e = new CodeExpr(locals, blocks);
break;
}
default: SynErr(126); break;
}
}
public ActionInfo(Procedure proc, CodeExpr codeExpr, MoverType moverType, int phaseNum)
{
this.proc = proc;
this.moverType = moverType;
this.phaseNum = phaseNum;
this.callerPhaseNums = new HashSet <int>();
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>();
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, assertCmd.Expr);
}
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);
this.thatInParams.Add(y);
map[x] = new IdentifierExpr(Token.NoToken, 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);
this.thatOutParams.Add(y);
map[x] = new IdentifierExpr(Token.NoToken, y);
}
List <Variable> otherLocVars = 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] = new IdentifierExpr(Token.NoToken, y);
otherLocVars.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> otherBlocks = 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 otherBlock = new Block();
otherBlock.Cmds = otherCmds;
otherBlock.Label = "that_" + block.Label;
block.Label = "this_" + block.Label;
otherBlocks.Add(otherBlock);
blockMap[block] = otherBlock;
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> otherGotoCmdLabelTargets = new List <Block>();
List <string> otherGotoCmdLabelNames = new List <string>();
GotoCmd gotoCmd = block.TransferCmd as GotoCmd;
foreach (Block target in gotoCmd.labelTargets)
{
otherGotoCmdLabelTargets.Add(blockMap[target]);
otherGotoCmdLabelNames.Add(blockMap[target].Label);
}
blockMap[block].TransferCmd = new GotoCmd(block.TransferCmd.tok, otherGotoCmdLabelNames, otherGotoCmdLabelTargets);
}
this.thatAction = new CodeExpr(otherLocVars, otherBlocks);
}
public void TypeCheck()
{
foreach (var proc in program.Procedures)
{
if (!QKeyValue.FindBoolAttribute(proc.Attributes, "pure"))
{
continue;
}
if (QKeyValue.FindBoolAttribute(proc.Attributes, "yields"))
{
Error(proc, "Pure procedure must not yield");
continue;
}
if (QKeyValue.FindBoolAttribute(proc.Attributes, "layer"))
{
Error(proc, "Pure procedure must not have layers");
continue;
}
if (proc.Modifies.Count > 0)
{
Error(proc, "Pure procedure must not modify a global variable");
continue;
}
procToAtomicProcedureInfo[proc] = new AtomicProcedureInfo();
}
foreach (var proc in program.Procedures)
{
if (QKeyValue.FindBoolAttribute(proc.Attributes, "yields"))
{
continue;
}
var procLayerNums = FindLayers(proc.Attributes);
if (procLayerNums.Count == 0)
{
continue;
}
foreach (IdentifierExpr ie in proc.Modifies)
{
if (!globalVarToSharedVarInfo.ContainsKey(ie.Decl))
{
Error(proc, "Atomic procedure cannot modify a global variable without layer numbers");
continue;
}
}
int lower, upper;
if (procLayerNums.Count == 1)
{
lower = procLayerNums[0];
upper = procLayerNums[0];
}
else if (procLayerNums.Count == 2)
{
lower = procLayerNums[0];
upper = procLayerNums[1];
if (lower >= upper)
{
Error(proc, "Lower layer must be less than upper layer");
continue;
}
}
else
{
Error(proc, "Atomic procedure must specify a layer range");
continue;
}
LayerRange layerRange = new LayerRange(lower, upper);
procToAtomicProcedureInfo[proc] = new AtomicProcedureInfo(layerRange);
}
if (errorCount > 0)
{
return;
}
foreach (Implementation impl in program.Implementations)
{
if (!procToAtomicProcedureInfo.ContainsKey(impl.Proc))
{
continue;
}
var atomicProcedureInfo = procToAtomicProcedureInfo[impl.Proc];
if (atomicProcedureInfo.isPure)
{
this.enclosingImpl = impl;
(new PurityChecker(this)).VisitImplementation(impl);
}
else
{
this.enclosingImpl = impl;
this.sharedVarsAccessed = new HashSet <Variable>();
(new PurityChecker(this)).VisitImplementation(impl);
LayerRange upperBound = FindLayerRange();
LayerRange lowerBound = atomicProcedureInfo.layerRange;
if (!lowerBound.Subset(upperBound))
{
Error(impl, "Atomic procedure cannot access global variable");
}
this.sharedVarsAccessed = null;
}
}
if (errorCount > 0)
{
return;
}
foreach (var proc in program.Procedures)
{
if (!QKeyValue.FindBoolAttribute(proc.Attributes, "yields"))
{
continue;
}
int createdAtLayerNum; // must be initialized by the following code, otherwise it is an error
int availableUptoLayerNum = int.MaxValue;
List <int> attrs = FindLayers(proc.Attributes);
if (attrs.Count == 1)
{
createdAtLayerNum = attrs[0];
}
else if (attrs.Count == 2)
{
createdAtLayerNum = attrs[0];
availableUptoLayerNum = attrs[1];
}
else
{
Error(proc, "Incorrect number of layers");
continue;
}
foreach (Ensures e in proc.Ensures)
{
MoverType moverType = GetMoverType(e);
if (moverType == MoverType.Top)
{
continue;
}
CodeExpr codeExpr = e.Condition as CodeExpr;
if (codeExpr == null)
{
Error(e, "An atomic action must be a CodeExpr");
continue;
}
if (procToActionInfo.ContainsKey(proc))
{
Error(proc, "A procedure can have at most one atomic action");
continue;
}
if (availableUptoLayerNum <= createdAtLayerNum)
{
Error(proc, "Creation layer number must be less than the available upto layer number");
continue;
}
sharedVarsAccessed = new HashSet <Variable>();
enclosingProc = proc;
enclosingImpl = null;
base.VisitEnsures(e);
LayerRange upperBound = FindLayerRange();
LayerRange lowerBound = new LayerRange(createdAtLayerNum, availableUptoLayerNum);
if (lowerBound.Subset(upperBound))
{
procToActionInfo[proc] = new AtomicActionInfo(proc, e, moverType, createdAtLayerNum, availableUptoLayerNum);
}
else
{
Error(e, "A variable being accessed in this action is unavailable");
}
sharedVarsAccessed = null;
}
if (errorCount > 0)
{
continue;
}
if (!procToActionInfo.ContainsKey(proc))
{
if (availableUptoLayerNum < createdAtLayerNum)
{
Error(proc, "Creation layer number must be no more than the available upto layer number");
continue;
}
else
{
procToActionInfo[proc] = new ActionInfo(proc, createdAtLayerNum, availableUptoLayerNum);
}
}
}
if (errorCount > 0)
{
return;
}
foreach (var impl in program.Implementations)
{
if (!procToActionInfo.ContainsKey(impl.Proc))
{
continue;
}
ActionInfo actionInfo = procToActionInfo[impl.Proc];
procToActionInfo[impl.Proc].hasImplementation = true;
if (actionInfo.isExtern)
{
Error(impl.Proc, "Extern procedure cannot have an implementation");
}
}
if (errorCount > 0)
{
return;
}
foreach (Procedure proc in procToActionInfo.Keys)
{
for (int i = 0; i < proc.InParams.Count; i++)
{
Variable v = proc.InParams[i];
var layer = FindLocalVariableLayer(proc, v, procToActionInfo[proc].createdAtLayerNum);
if (layer == int.MinValue)
{
continue;
}
localVarToLocalVariableInfo[v] = new LocalVariableInfo(layer);
}
for (int i = 0; i < proc.OutParams.Count; i++)
{
Variable v = proc.OutParams[i];
var layer = FindLocalVariableLayer(proc, v, procToActionInfo[proc].createdAtLayerNum);
if (layer == int.MinValue)
{
continue;
}
localVarToLocalVariableInfo[v] = new LocalVariableInfo(layer);
}
}
foreach (Implementation node in program.Implementations)
{
if (!procToActionInfo.ContainsKey(node.Proc))
{
continue;
}
foreach (Variable v in node.LocVars)
{
var layer = FindLocalVariableLayer(node, v, procToActionInfo[node.Proc].createdAtLayerNum);
if (layer == int.MinValue)
{
continue;
}
localVarToLocalVariableInfo[v] = new LocalVariableInfo(layer);
}
for (int i = 0; i < node.Proc.InParams.Count; i++)
{
Variable v = node.Proc.InParams[i];
if (!localVarToLocalVariableInfo.ContainsKey(v))
{
continue;
}
var layer = localVarToLocalVariableInfo[v].layer;
localVarToLocalVariableInfo[node.InParams[i]] = new LocalVariableInfo(layer);
}
for (int i = 0; i < node.Proc.OutParams.Count; i++)
{
Variable v = node.Proc.OutParams[i];
if (!localVarToLocalVariableInfo.ContainsKey(v))
{
continue;
}
var layer = localVarToLocalVariableInfo[v].layer;
localVarToLocalVariableInfo[node.OutParams[i]] = new LocalVariableInfo(layer);
}
}
if (errorCount > 0)
{
return;
}
this.VisitProgram(program);
if (errorCount > 0)
{
return;
}
YieldTypeChecker.PerformYieldSafeCheck(this);
new LayerEraser().VisitProgram(program);
}
public override Expr VisitCodeExpr(CodeExpr node)
{
add(node);
return(base.VisitCodeExpr(node));
}
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));
}
}
//do not support code block expressions
public override Expr VisitCodeExpr(CodeExpr node)
{
problematicNode = node;
return(node);
}
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));
}
}
public void TypeCheck()
{
foreach (var proc in program.Procedures)
{
if (!QKeyValue.FindBoolAttribute(proc.Attributes, "yields"))
{
continue;
}
int createdAtLayerNum; // must be initialized by the following code, otherwise it is an error
int availableUptoLayerNum = int.MaxValue;
List <int> attrs = FindLayers(proc.Attributes);
if (attrs.Count == 1)
{
createdAtLayerNum = attrs[0];
}
else if (attrs.Count == 2)
{
createdAtLayerNum = attrs[0];
availableUptoLayerNum = attrs[1];
}
else
{
Error(proc, "Incorrect number of layers");
continue;
}
foreach (Ensures e in proc.Ensures)
{
MoverType moverType = GetMoverType(e);
if (moverType == MoverType.Top)
{
continue;
}
CodeExpr codeExpr = e.Condition as CodeExpr;
if (codeExpr == null)
{
Error(e, "An atomic action must be a CodeExpr");
continue;
}
if (procToActionInfo.ContainsKey(proc))
{
Error(proc, "A procedure can have at most one atomic action");
continue;
}
if (availableUptoLayerNum <= createdAtLayerNum)
{
Error(proc, "Creation layer number must be less than the available upto layer number");
continue;
}
minLayerNum = int.MaxValue;
maxLayerNum = -1;
canAccessSharedVars = true;
enclosingProc = proc;
enclosingImpl = null;
base.VisitEnsures(e);
canAccessSharedVars = false;
if (maxLayerNum > createdAtLayerNum)
{
Error(e, "A variable being accessed is introduced after this action is created");
}
else if (availableUptoLayerNum > minLayerNum)
{
Error(e, "A variable being accessed is hidden before this action becomes unavailable");
}
else
{
procToActionInfo[proc] = new AtomicActionInfo(proc, e, moverType, createdAtLayerNum, availableUptoLayerNum);
}
}
if (errorCount > 0)
{
continue;
}
if (!procToActionInfo.ContainsKey(proc))
{
if (availableUptoLayerNum < createdAtLayerNum)
{
Error(proc, "Creation layer number must be no more than the available upto layer number");
continue;
}
else
{
procToActionInfo[proc] = new ActionInfo(proc, createdAtLayerNum, availableUptoLayerNum);
}
}
}
if (errorCount > 0)
{
return;
}
foreach (var impl in program.Implementations)
{
if (!procToActionInfo.ContainsKey(impl.Proc))
{
continue;
}
procToActionInfo[impl.Proc].hasImplementation = true;
}
foreach (var proc in procToActionInfo.Keys)
{
ActionInfo actionInfo = procToActionInfo[proc];
if (actionInfo.isExtern && actionInfo.hasImplementation)
{
Error(proc, "Extern procedure cannot have an implementation");
continue;
}
if (actionInfo.isExtern || actionInfo.hasImplementation)
{
continue;
}
if (leastUnimplementedLayerNum == int.MaxValue)
{
leastUnimplementedLayerNum = actionInfo.createdAtLayerNum;
}
else if (leastUnimplementedLayerNum != actionInfo.createdAtLayerNum)
{
Error(proc, "All unimplemented atomic actions must be created at the same layer");
}
}
foreach (var g in this.globalVarToSharedVarInfo.Keys)
{
var info = globalVarToSharedVarInfo[g];
if (!this.AllCreatedLayerNums.Contains(info.introLayerNum))
{
Error(g, "Variable must be introduced with creation of some atomic action");
}
if (info.hideLayerNum != int.MaxValue && !this.AllCreatedLayerNums.Contains(info.hideLayerNum))
{
Error(g, "Variable must be hidden with creation of some atomic action");
}
}
if (errorCount > 0)
{
return;
}
this.VisitProgram(program);
foreach (Procedure proc in program.Procedures)
{
if (procToActionInfo.ContainsKey(proc))
{
continue;
}
foreach (var ie in proc.Modifies)
{
if (!SharedVariables.Contains(ie.Decl))
{
continue;
}
Error(proc, "A ghost procedure must not modify a global variable with layer annotation");
}
}
if (errorCount > 0)
{
return;
}
YieldTypeChecker.PerformYieldSafeCheck(this);
new LayerEraser().VisitProgram(program);
}
public override Expr VisitCodeExpr(CodeExpr node)
{
throw new NotImplementedException();
}
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));
}
}
public override Expr VisitCodeExpr(CodeExpr node)
{
Contract.Ensures(Contract.Result<Expr>() == node);
this.VisitVariableSeq(node.LocVars);
this.VisitBlockList(node.Blocks);
return node;
}
public ActionInfo(Procedure proc, CodeExpr codeExpr, MoverType moverType, int phaseNum)
{
this.proc = proc;
this.moverType = moverType;
this.phaseNum = phaseNum;
this.callerPhaseNums = new HashSet<int>();
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>();
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, assertCmd.Expr);
}
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);
this.thatInParams.Add(y);
map[x] = new IdentifierExpr(Token.NoToken, 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);
this.thatOutParams.Add(y);
map[x] = new IdentifierExpr(Token.NoToken, y);
}
List<Variable> otherLocVars = 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] = new IdentifierExpr(Token.NoToken, y);
otherLocVars.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> otherBlocks = 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 otherBlock = new Block();
otherBlock.Cmds = otherCmds;
otherBlock.Label = "that_" + block.Label;
block.Label = "this_" + block.Label;
otherBlocks.Add(otherBlock);
blockMap[block] = otherBlock;
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> otherGotoCmdLabelTargets = new List<Block>();
List<string> otherGotoCmdLabelNames = new List<string>();
GotoCmd gotoCmd = block.TransferCmd as GotoCmd;
foreach (Block target in gotoCmd.labelTargets)
{
otherGotoCmdLabelTargets.Add(blockMap[target]);
otherGotoCmdLabelNames.Add(blockMap[target].Label);
}
blockMap[block].TransferCmd = new GotoCmd(block.TransferCmd.tok, otherGotoCmdLabelNames, otherGotoCmdLabelTargets);
}
this.thatAction = new CodeExpr(otherLocVars, otherBlocks);
}
public Expr VisitCodeExpr(CodeExpr e)
{
throw new NotImplementedException();
}
public override Expr VisitCodeExpr(CodeExpr node) {
// don't recurse on subexpression
return node;
}
public override Expr VisitCodeExpr(CodeExpr node) {
// don't go into the code expression, since it can only modify variables local to the code expression,
// and the mod-set analysis is interested in global variables
return node;
}