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|
//-----------------------------------------------------------------------------
//
// Copyright (C) Microsoft Corporation. All Rights Reserved.
//
//-----------------------------------------------------------------------------
//---------------------------------------------------------------------------------------------
// BoogiePL - Absy.cs
//---------------------------------------------------------------------------------------------
namespace Microsoft.Boogie.AbstractInterpretation {
using System.Diagnostics;
using System.Diagnostics.Contracts;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
public class CallSite {
public readonly Implementation/*!*/ Impl;
public readonly Block/*!*/ Block;
public readonly int Statement; // invariant: Block[Statement] is CallCmd
public readonly ProcedureSummaryEntry/*!*/ SummaryEntry;
[ContractInvariantMethod]
void ObjectInvariant() {
Contract.Invariant(Impl != null);
Contract.Invariant(Block != null);
Contract.Invariant(SummaryEntry != null);
}
public CallSite(Implementation impl, Block b, int stmt, ProcedureSummaryEntry summaryEntry) {
Contract.Requires(summaryEntry != null);
Contract.Requires(b != null);
Contract.Requires(impl != null);
this.Impl = impl;
this.Block = b;
this.Statement = stmt;
this.SummaryEntry = summaryEntry;
}
}
public class ProcedureSummaryEntry {
public HashSet<CallSite>/*!*/ ReturnPoints; // whenever OnExit changes, we start analysis again at all the ReturnPoints
[ContractInvariantMethod]
void ObjectInvariant() {
Contract.Invariant(ReturnPoints != null);
}
public ProcedureSummaryEntry() {
this.ReturnPoints = new HashSet<CallSite>();
}
} // class
public class ProcedureSummary : ArrayList/*<ProcedureSummaryEntry>*/
{
[ContractInvariantMethod]
void ObjectInvariant() {
Contract.Invariant(
!IsReadOnly && !IsFixedSize);
}
public new ProcedureSummaryEntry/*!*/ this[int i] {
get {
Contract.Requires(0 <= i && i < Count);
Contract.Ensures(Contract.Result<ProcedureSummaryEntry>() != null);
return cce.NonNull((ProcedureSummaryEntry/*!*/)base[i]);
}
}
} // class
} // namespace
namespace Microsoft.Boogie {
using System;
using System.Linq;
using System.Collections;
using System.Diagnostics;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using Microsoft.Boogie.AbstractInterpretation;
using Microsoft.Boogie.GraphUtil;
using Set = GSet<object>;
[ContractClass(typeof(AbsyContracts))]
public abstract class Absy {
public IToken/*!*/ tok;
private int uniqueId;
[ContractInvariantMethod]
void ObjectInvariant() {
Contract.Invariant(tok != null);
}
public int Line {
get {
return tok != null ? tok.line : -1;
}
}
public int Col {
get {
return tok != null ? tok.col : -1;
}
}
public Absy(IToken tok) {
Contract.Requires(tok != null);
this.tok = tok;
this.uniqueId = AbsyNodeCount++;
}
private static int AbsyNodeCount = 0;
// We uniquely number every AST node to make them
// suitable for our implementation of functional maps.
//
public int UniqueId {
get {
return this.uniqueId;
}
}
private const int indent_size = 2;
protected static string Indent(int level) {
return new string(' ', (indent_size * level));
}
[NeedsContracts]
public abstract void Resolve(ResolutionContext/*!*/ rc);
/// <summary>
/// Requires the object to have been successfully resolved.
/// </summary>
/// <param name="tc"></param>
[NeedsContracts]
public abstract void Typecheck(TypecheckingContext/*!*/ tc);
/// <summary>
/// Intorduced this so the uniqueId is not the same on a cloned object.
/// </summary>
/// <param name="tc"></param>
public virtual Absy Clone() {
Contract.Ensures(Contract.Result<Absy>() != null);
Absy/*!*/ result = cce.NonNull((Absy/*!*/)this.MemberwiseClone());
result.uniqueId = AbsyNodeCount++; // BUGBUG??
return result;
}
public virtual Absy StdDispatch(StandardVisitor visitor) {
Contract.Requires(visitor != null);
Contract.Ensures(Contract.Result<Absy>() != null);
System.Diagnostics.Debug.Fail("Unknown Absy node type: " + this.GetType());
throw new System.NotImplementedException();
}
}
[ContractClassFor(typeof(Absy))]
public abstract class AbsyContracts : Absy {
public override void Resolve(ResolutionContext rc) {
Contract.Requires(rc != null);
throw new NotImplementedException();
}
public AbsyContracts() :base(null){
}
public override void Typecheck(TypecheckingContext tc) {
Contract.Requires(tc != null);
throw new NotImplementedException();
}
}
// TODO: Ideally, this would use generics.
public interface IPotentialErrorNode {
object ErrorData {
get;
set;
}
}
public class Program : Absy {
[Rep]
public List<Declaration/*!*/>/*!*/ TopLevelDeclarations;
[ContractInvariantMethod]
void ObjectInvariant() {
Contract.Invariant(cce.NonNullElements(TopLevelDeclarations));
Contract.Invariant(globals == null || cce.NonNullElements(globals));
}
public Program()
: base(Token.NoToken) {
this.TopLevelDeclarations = new List<Declaration>();
}
public void Emit(TokenTextWriter stream) {
Contract.Requires(stream != null);
stream.SetToken(this);
this.TopLevelDeclarations.Emit(stream);
}
public void ProcessDatatypeConstructors() {
Dictionary<string, DatatypeConstructor> constructors = new Dictionary<string, DatatypeConstructor>();
List<Declaration> prunedTopLevelDeclarations = new List<Declaration>();
foreach (Declaration decl in TopLevelDeclarations) {
Function func = decl as Function;
if (func == null || !QKeyValue.FindBoolAttribute(decl.Attributes, "constructor")) {
prunedTopLevelDeclarations.Add(decl);
continue;
}
if (constructors.ContainsKey(func.Name)) continue;
DatatypeConstructor constructor = new DatatypeConstructor(func);
constructors.Add(func.Name, constructor);
prunedTopLevelDeclarations.Add(constructor);
}
TopLevelDeclarations = prunedTopLevelDeclarations;
foreach (DatatypeConstructor f in constructors.Values) {
for (int i = 0; i < f.InParams.Count; i++) {
DatatypeSelector selector = new DatatypeSelector(f, i);
f.selectors.Add(selector);
TopLevelDeclarations.Add(selector);
}
DatatypeMembership membership = new DatatypeMembership(f);
f.membership = membership;
TopLevelDeclarations.Add(membership);
}
}
/// <summary>
/// Returns the number of name resolution errors.
/// </summary>
/// <returns></returns>
public int Resolve() {
return Resolve((IErrorSink)null);
}
public int Resolve(IErrorSink errorSink) {
ResolutionContext rc = new ResolutionContext(errorSink);
Resolve(rc);
return rc.ErrorCount;
}
public override void Resolve(ResolutionContext rc) {
//Contract.Requires(rc != null);
Helpers.ExtraTraceInformation("Starting resolution");
foreach (Declaration d in TopLevelDeclarations) {
d.Register(rc);
}
ResolveTypes(rc);
var prunedTopLevelDecls = new List<Declaration/*!*/>();
foreach (Declaration d in TopLevelDeclarations) {
if (QKeyValue.FindBoolAttribute(d.Attributes, "ignore")) {
continue;
}
// resolve all the non-type-declarations
if (d is TypeCtorDecl || d is TypeSynonymDecl) {
} else {
int e = rc.ErrorCount;
d.Resolve(rc);
if (CommandLineOptions.Clo.OverlookBoogieTypeErrors && rc.ErrorCount != e && d is Implementation) {
// ignore this implementation
System.Console.WriteLine("Warning: Ignoring implementation {0} because of translation resolution errors", ((Implementation)d).Name);
rc.ErrorCount = e;
continue;
}
}
prunedTopLevelDecls.Add(d);
}
TopLevelDeclarations = prunedTopLevelDecls;
foreach (Declaration d in TopLevelDeclarations) {
Variable v = d as Variable;
if (v != null) {
v.ResolveWhere(rc);
}
}
}
private void ResolveTypes(ResolutionContext rc) {
Contract.Requires(rc != null);
// first resolve type constructors
foreach (Declaration d in TopLevelDeclarations) {
if (d is TypeCtorDecl && !QKeyValue.FindBoolAttribute(d.Attributes, "ignore"))
d.Resolve(rc);
}
// collect type synonym declarations
List<TypeSynonymDecl/*!*/>/*!*/ synonymDecls = new List<TypeSynonymDecl/*!*/>();
foreach (Declaration d in TopLevelDeclarations) {
Contract.Assert(d != null);
if (d is TypeSynonymDecl && !QKeyValue.FindBoolAttribute(d.Attributes, "ignore"))
synonymDecls.Add((TypeSynonymDecl)d);
}
// then resolve the type synonyms by a simple
// fixed-point iteration
TypeSynonymDecl.ResolveTypeSynonyms(synonymDecls, rc);
}
public int Typecheck() {
return this.Typecheck((IErrorSink)null);
}
public int Typecheck(IErrorSink errorSink) {
TypecheckingContext tc = new TypecheckingContext(errorSink);
Typecheck(tc);
return tc.ErrorCount;
}
public override void Typecheck(TypecheckingContext tc) {
//Contract.Requires(tc != null);
Helpers.ExtraTraceInformation("Starting typechecking");
int oldErrorCount = tc.ErrorCount;
foreach (Declaration d in TopLevelDeclarations) {
d.Typecheck(tc);
}
if (oldErrorCount == tc.ErrorCount) {
// check whether any type proxies have remained uninstantiated
TypeAmbiguitySeeker/*!*/ seeker = new TypeAmbiguitySeeker(tc);
foreach (Declaration d in TopLevelDeclarations) {
seeker.Visit(d);
}
}
}
public void ComputeStronglyConnectedComponents() {
foreach (Declaration d in this.TopLevelDeclarations) {
d.ComputeStronglyConnectedComponents();
}
}
/// <summary>
/// Reset the abstract stated computed before
/// </summary>
public void ResetAbstractInterpretationState() {
foreach (Declaration d in this.TopLevelDeclarations) {
d.ResetAbstractInterpretationState();
}
}
public void UnrollLoops(int n, bool uc) {
Contract.Requires(0 <= n);
foreach (Declaration d in this.TopLevelDeclarations) {
Implementation impl = d as Implementation;
if (impl != null && impl.Blocks != null && impl.Blocks.Count > 0) {
cce.BeginExpose(impl);
{
Block start = impl.Blocks[0];
Contract.Assume(start != null);
Contract.Assume(cce.IsConsistent(start));
impl.Blocks = LoopUnroll.UnrollLoops(start, n, uc);
}
cce.EndExpose();
}
}
}
void CreateProceduresForLoops(Implementation impl, Graph<Block/*!*/>/*!*/ g,
List<Implementation/*!*/>/*!*/ loopImpls,
Dictionary<string, Dictionary<string, Block>> fullMap) {
Contract.Requires(impl != null);
Contract.Requires(cce.NonNullElements(loopImpls));
// Enumerate the headers
// for each header h:
// create implementation p_h with
// inputs = inputs, outputs, and locals of impl
// outputs = outputs and locals of impl
// locals = empty set
// add call o := p_h(i) at the beginning of the header block
// break the back edges whose target is h
// Enumerate the headers again to create the bodies of p_h
// for each header h:
// compute the loop corresponding to h
// make copies of all blocks in the loop for h
// delete all target edges that do not go to a block in the loop
// create a new entry block and a new return block
// add edges from entry block to the loop header and the return block
// add calls o := p_h(i) at the end of the blocks that are sources of back edges
foreach (Block block in impl.Blocks)
{
AddToFullMap(fullMap, impl.Name, block.Label, block);
}
bool detLoopExtract = CommandLineOptions.Clo.DeterministicExtractLoops;
Dictionary<Block/*!*/, List<Variable>/*!*/>/*!*/ loopHeaderToInputs = new Dictionary<Block/*!*/, List<Variable>/*!*/>();
Dictionary<Block/*!*/, List<Variable>/*!*/>/*!*/ loopHeaderToOutputs = new Dictionary<Block/*!*/, List<Variable>/*!*/>();
Dictionary<Block/*!*/, Dictionary<Variable, Expr>/*!*/>/*!*/ loopHeaderToSubstMap = new Dictionary<Block/*!*/, Dictionary<Variable, Expr>/*!*/>();
Dictionary<Block/*!*/, LoopProcedure/*!*/>/*!*/ loopHeaderToLoopProc = new Dictionary<Block/*!*/, LoopProcedure/*!*/>();
Dictionary<Block/*!*/, CallCmd/*!*/>/*!*/ loopHeaderToCallCmd1 = new Dictionary<Block/*!*/, CallCmd/*!*/>();
Dictionary<Block, CallCmd> loopHeaderToCallCmd2 = new Dictionary<Block, CallCmd>();
Dictionary<Block, AssignCmd> loopHeaderToAssignCmd = new Dictionary<Block, AssignCmd>();
foreach (Block/*!*/ header in g.Headers) {
Contract.Assert(header != null);
Contract.Assert(header != null);
List<Variable> inputs = new List<Variable>();
List<Variable> outputs = new List<Variable>();
List<Expr> callInputs1 = new List<Expr>();
List<IdentifierExpr> callOutputs1 = new List<IdentifierExpr>();
List<Expr> callInputs2 = new List<Expr>();
List<IdentifierExpr> callOutputs2 = new List<IdentifierExpr>();
List<AssignLhs> lhss = new List<AssignLhs>();
List<Expr> rhss = new List<Expr>();
Dictionary<Variable, Expr> substMap = new Dictionary<Variable, Expr>(); // Variable -> IdentifierExpr
List<Variable>/*!*/ targets = new List<Variable>();
HashSet<Variable> footprint = new HashSet<Variable>();
foreach (Block/*!*/ b in g.BackEdgeNodes(header))
{
Contract.Assert(b != null);
foreach (Block/*!*/ block in g.NaturalLoops(header, b))
{
Contract.Assert(block != null);
foreach (Cmd/*!*/ cmd in block.Cmds)
{
Contract.Assert(cmd != null);
cmd.AddAssignedVariables(targets);
VariableCollector c = new VariableCollector();
c.Visit(cmd);
footprint.UnionWith(c.usedVars);
}
}
}
List<IdentifierExpr>/*!*/ globalMods = new List<IdentifierExpr>();
Set targetSet = new Set();
foreach (Variable/*!*/ v in targets)
{
Contract.Assert(v != null);
if (targetSet.Contains(v))
continue;
targetSet.Add(v);
if (v is GlobalVariable)
globalMods.Add(new IdentifierExpr(Token.NoToken, v));
}
foreach (Variable v in impl.InParams) {
Contract.Assert(v != null);
if (!footprint.Contains(v)) continue;
callInputs1.Add(new IdentifierExpr(Token.NoToken, v));
Formal f = new Formal(Token.NoToken, new TypedIdent(Token.NoToken, "in_" + v.Name, v.TypedIdent.Type), true);
inputs.Add(f);
callInputs2.Add(new IdentifierExpr(Token.NoToken, f));
substMap[v] = new IdentifierExpr(Token.NoToken, f);
}
foreach (Variable v in impl.OutParams) {
Contract.Assert(v != null);
if (!footprint.Contains(v)) continue;
callInputs1.Add(new IdentifierExpr(Token.NoToken, v));
Formal f1 = new Formal(Token.NoToken, new TypedIdent(Token.NoToken, "in_" + v.Name, v.TypedIdent.Type), true);
inputs.Add(f1);
if (targetSet.Contains(v))
{
callOutputs1.Add(new IdentifierExpr(Token.NoToken, v));
Formal f2 = new Formal(Token.NoToken, new TypedIdent(Token.NoToken, "out_" + v.Name, v.TypedIdent.Type), false);
outputs.Add(f2);
callInputs2.Add(new IdentifierExpr(Token.NoToken, f2));
callOutputs2.Add(new IdentifierExpr(Token.NoToken, f2));
lhss.Add(new SimpleAssignLhs(Token.NoToken, new IdentifierExpr(Token.NoToken, f2)));
rhss.Add(new IdentifierExpr(Token.NoToken, f1));
substMap[v] = new IdentifierExpr(Token.NoToken, f2);
}
else
{
callInputs2.Add(new IdentifierExpr(Token.NoToken, f1));
substMap[v] = new IdentifierExpr(Token.NoToken, f1);
}
}
foreach (Variable v in impl.LocVars) {
Contract.Assert(v != null);
if (!footprint.Contains(v)) continue;
callInputs1.Add(new IdentifierExpr(Token.NoToken, v));
Formal f1 = new Formal(Token.NoToken, new TypedIdent(Token.NoToken, "in_" + v.Name, v.TypedIdent.Type), true);
inputs.Add(f1);
if (targetSet.Contains(v))
{
callOutputs1.Add(new IdentifierExpr(Token.NoToken, v));
Formal f2 = new Formal(Token.NoToken, new TypedIdent(Token.NoToken, "out_" + v.Name, v.TypedIdent.Type), false);
outputs.Add(f2);
callInputs2.Add(new IdentifierExpr(Token.NoToken, f2));
callOutputs2.Add(new IdentifierExpr(Token.NoToken, f2));
lhss.Add(new SimpleAssignLhs(Token.NoToken, new IdentifierExpr(Token.NoToken, f2)));
rhss.Add(new IdentifierExpr(Token.NoToken, f1));
substMap[v] = new IdentifierExpr(Token.NoToken, f2);
}
else
{
callInputs2.Add(new IdentifierExpr(Token.NoToken, f1));
substMap[v] = new IdentifierExpr(Token.NoToken, f1);
}
}
loopHeaderToInputs[header] = inputs;
loopHeaderToOutputs[header] = outputs;
loopHeaderToSubstMap[header] = substMap;
LoopProcedure loopProc = new LoopProcedure(impl, header, inputs, outputs, globalMods);
loopHeaderToLoopProc[header] = loopProc;
CallCmd callCmd1 = new CallCmd(Token.NoToken, loopProc.Name, callInputs1, callOutputs1);
callCmd1.Proc = loopProc;
loopHeaderToCallCmd1[header] = callCmd1;
CallCmd callCmd2 = new CallCmd(Token.NoToken, loopProc.Name, callInputs2, callOutputs2);
callCmd2.Proc = loopProc;
loopHeaderToCallCmd2[header] = callCmd2;
Debug.Assert(lhss.Count == rhss.Count);
if (lhss.Count > 0)
{
AssignCmd assignCmd = new AssignCmd(Token.NoToken, lhss, rhss);
loopHeaderToAssignCmd[header] = assignCmd;
}
}
// Keep track of the new blocks created: maps a header node to the
// header_last block that was created because of splitting header.
Dictionary<Block, Block> newBlocksCreated = new Dictionary<Block, Block>();
bool headRecursion = false; // testing an option to put recursive call before loop body
IEnumerable<Block> sortedHeaders = g.SortHeadersByDominance();
foreach (Block/*!*/ header in sortedHeaders)
{
Contract.Assert(header != null);
LoopProcedure loopProc = loopHeaderToLoopProc[header];
Dictionary<Block, Block> blockMap = new Dictionary<Block, Block>();
HashSet<string> dummyBlocks = new HashSet<string>();
CodeCopier codeCopier = new CodeCopier(loopHeaderToSubstMap[header]); // fix me
List<Variable> inputs = loopHeaderToInputs[header];
List<Variable> outputs = loopHeaderToOutputs[header];
int si_unique_loc = 1; // Added by AL: to distinguish the back edges
foreach (Block/*!*/ source in g.BackEdgeNodes(header)) {
Contract.Assert(source != null);
foreach (Block/*!*/ block in g.NaturalLoops(header, source)) {
Contract.Assert(block != null);
if (blockMap.ContainsKey(block))
continue;
Block newBlock = new Block();
newBlock.Label = block.Label;
if (headRecursion && block == header)
{
CallCmd callCmd = (CallCmd)(loopHeaderToCallCmd2[header]).Clone();
addUniqueCallAttr(si_unique_loc, callCmd);
si_unique_loc++;
newBlock.Cmds.Add(callCmd); // add the recursive call at head of loop
var rest = codeCopier.CopyCmdSeq(block.Cmds);
newBlock.Cmds.AddRange(rest);
}
else
newBlock.Cmds = codeCopier.CopyCmdSeq(block.Cmds);
blockMap[block] = newBlock;
if (newBlocksCreated.ContainsKey(block))
{
Block newBlock2 = new Block();
newBlock2.Label = newBlocksCreated[block].Label;
newBlock2.Cmds = codeCopier.CopyCmdSeq(newBlocksCreated[block].Cmds);
blockMap[newBlocksCreated[block]] = newBlock2;
}
//for detLoopExtract, need the immediate successors even outside the loop
if (detLoopExtract) {
GotoCmd auxGotoCmd = block.TransferCmd as GotoCmd;
Contract.Assert(auxGotoCmd != null && auxGotoCmd.labelNames != null &&
auxGotoCmd.labelTargets != null && auxGotoCmd.labelTargets.Count >= 1);
foreach(var bl in auxGotoCmd.labelTargets) {
bool found = false;
foreach(var n in g.NaturalLoops(header, source)) { //very expensive, can we do a contains?
if (bl == n) { //clarify: is this the right comparison?
found = true;
break;
}
}
if (!found) {
Block auxNewBlock = new Block();
auxNewBlock.Label = ((Block)bl).Label;
auxNewBlock.Cmds = codeCopier.CopyCmdSeq(((Block)bl).Cmds);
//add restoration code for such blocks
if (loopHeaderToAssignCmd.ContainsKey(header))
{
AssignCmd assignCmd = loopHeaderToAssignCmd[header];
auxNewBlock.Cmds.Add(assignCmd);
}
List<AssignLhs> lhsg = new List<AssignLhs>();
List<IdentifierExpr>/*!*/ globalsMods = loopHeaderToLoopProc[header].Modifies;
foreach (IdentifierExpr gl in globalsMods)
lhsg.Add(new SimpleAssignLhs(Token.NoToken, gl));
List<Expr> rhsg = new List<Expr>();
foreach (IdentifierExpr gl in globalsMods)
rhsg.Add(new OldExpr(Token.NoToken, gl));
if (lhsg.Count != 0)
{
AssignCmd globalAssignCmd = new AssignCmd(Token.NoToken, lhsg, rhsg);
auxNewBlock.Cmds.Add(globalAssignCmd);
}
blockMap[(Block)bl] = auxNewBlock;
}
}
}
}
List<Cmd> cmdSeq;
if (headRecursion)
cmdSeq = new List<Cmd>();
else
{
CallCmd callCmd = (CallCmd)(loopHeaderToCallCmd2[header]).Clone();
addUniqueCallAttr(si_unique_loc, callCmd);
si_unique_loc++;
cmdSeq = new List<Cmd> { callCmd };
}
Block/*!*/ block1 = new Block(Token.NoToken, source.Label + "_dummy",
new List<Cmd>{ new AssumeCmd(Token.NoToken, Expr.False) }, new ReturnCmd(Token.NoToken));
Block/*!*/ block2 = new Block(Token.NoToken, block1.Label,
cmdSeq, new ReturnCmd(Token.NoToken));
impl.Blocks.Add(block1);
dummyBlocks.Add(block1.Label);
GotoCmd gotoCmd = source.TransferCmd as GotoCmd;
Contract.Assert(gotoCmd != null && gotoCmd.labelNames != null && gotoCmd.labelTargets != null && gotoCmd.labelTargets.Count >= 1);
List<String>/*!*/ newLabels = new List<String>();
List<Block>/*!*/ newTargets = new List<Block>();
for (int i = 0; i < gotoCmd.labelTargets.Count; i++) {
if (gotoCmd.labelTargets[i] == header)
continue;
newTargets.Add(gotoCmd.labelTargets[i]);
newLabels.Add(gotoCmd.labelNames[i]);
}
newTargets.Add(block1);
newLabels.Add(block1.Label);
gotoCmd.labelNames = newLabels;
gotoCmd.labelTargets = newTargets;
blockMap[block1] = block2;
}
List<Block/*!*/>/*!*/ blocks = new List<Block/*!*/>();
Block exit = new Block(Token.NoToken, "exit", new List<Cmd>(), new ReturnCmd(Token.NoToken));
GotoCmd cmd = new GotoCmd(Token.NoToken,
new List<String> { cce.NonNull(blockMap[header]).Label, exit.Label },
new List<Block> { blockMap[header], exit });
if (detLoopExtract) //cutting the non-determinism
cmd = new GotoCmd(Token.NoToken,
new List<String> { cce.NonNull(blockMap[header]).Label },
new List<Block> { blockMap[header] });
Block entry;
List<Cmd> initCmds = new List<Cmd>();
if (loopHeaderToAssignCmd.ContainsKey(header)) {
AssignCmd assignCmd = loopHeaderToAssignCmd[header];
initCmds.Add(assignCmd);
}
entry = new Block(Token.NoToken, "entry", initCmds, cmd);
blocks.Add(entry);
foreach (Block/*!*/ block in blockMap.Keys) {
Contract.Assert(block != null);
Block/*!*/ newBlock = cce.NonNull(blockMap[block]);
GotoCmd gotoCmd = block.TransferCmd as GotoCmd;
if (gotoCmd == null) {
newBlock.TransferCmd = new ReturnCmd(Token.NoToken);
} else {
Contract.Assume(gotoCmd.labelNames != null && gotoCmd.labelTargets != null);
List<String> newLabels = new List<String>();
List<Block> newTargets = new List<Block>();
for (int i = 0; i < gotoCmd.labelTargets.Count; i++) {
Block target = gotoCmd.labelTargets[i];
if (blockMap.ContainsKey(target)) {
newLabels.Add(gotoCmd.labelNames[i]);
newTargets.Add(blockMap[target]);
}
}
if (newTargets.Count == 0) {
if (!detLoopExtract)
newBlock.Cmds.Add(new AssumeCmd(Token.NoToken, Expr.False));
newBlock.TransferCmd = new ReturnCmd(Token.NoToken);
} else {
newBlock.TransferCmd = new GotoCmd(Token.NoToken, newLabels, newTargets);
}
}
blocks.Add(newBlock);
}
blocks.Add(exit);
Implementation loopImpl =
new Implementation(Token.NoToken, loopProc.Name,
new List<TypeVariable>(), inputs, outputs, new List<Variable>(), blocks);
loopImpl.Proc = loopProc;
loopImpls.Add(loopImpl);
// Make a (shallow) copy of the header before splitting it
Block origHeader = new Block(header.tok, header.Label, header.Cmds, header.TransferCmd);
// Finally, add call to the loop in the containing procedure
string lastIterBlockName = header.Label + "_last";
Block lastIterBlock = new Block(Token.NoToken, lastIterBlockName, header.Cmds, header.TransferCmd);
newBlocksCreated[header] = lastIterBlock;
header.Cmds = new List<Cmd> { loopHeaderToCallCmd1[header] };
header.TransferCmd = new GotoCmd(Token.NoToken, new List<String> { lastIterBlockName }, new List<Block> { lastIterBlock });
impl.Blocks.Add(lastIterBlock);
blockMap[origHeader] = blockMap[header];
blockMap.Remove(header);
Contract.Assert(fullMap[impl.Name][header.Label] == header);
fullMap[impl.Name][header.Label] = origHeader;
foreach (Block block in blockMap.Keys)
{
// Don't add dummy blocks to the map
if (dummyBlocks.Contains(blockMap[block].Label)) continue;
// Following two statements are for nested loops: compose map
if (!fullMap[impl.Name].ContainsKey(block.Label)) continue;
var target = fullMap[impl.Name][block.Label];
AddToFullMap(fullMap, loopProc.Name, blockMap[block].Label, target);
}
fullMap[impl.Name].Remove(header.Label);
fullMap[impl.Name][lastIterBlockName] = origHeader;
}
}
private void addUniqueCallAttr(int val, CallCmd cmd)
{
var a = new List<object>();
a.Add(new LiteralExpr(Token.NoToken, Microsoft.Basetypes.BigNum.FromInt(val)));
cmd.Attributes = new QKeyValue(Token.NoToken, "si_unique_call", a, cmd.Attributes);
}
private void AddToFullMap(Dictionary<string, Dictionary<string, Block>> fullMap, string procName, string blockName, Block block)
{
if (!fullMap.ContainsKey(procName))
fullMap[procName] = new Dictionary<string, Block>();
fullMap[procName][blockName] = block;
}
public static Graph<Implementation> BuildCallGraph(Program program) {
Graph<Implementation> callGraph = new Graph<Implementation>();
Dictionary<Procedure, HashSet<Implementation>> procToImpls = new Dictionary<Procedure, HashSet<Implementation>>();
foreach (Declaration decl in program.TopLevelDeclarations) {
Procedure proc = decl as Procedure;
if (proc == null) continue;
procToImpls[proc] = new HashSet<Implementation>();
}
foreach (Declaration decl in program.TopLevelDeclarations) {
Implementation impl = decl as Implementation;
if (impl == null || impl.SkipVerification) continue;
callGraph.AddSource(impl);
procToImpls[impl.Proc].Add(impl);
}
foreach (Declaration decl in program.TopLevelDeclarations) {
Implementation impl = decl as Implementation;
if (impl == null || impl.SkipVerification) continue;
foreach (Block b in impl.Blocks) {
foreach (Cmd c in b.Cmds) {
CallCmd cc = c as CallCmd;
if (cc == null) continue;
foreach (Implementation callee in procToImpls[cc.Proc]) {
callGraph.AddEdge(impl, callee);
}
}
}
}
return callGraph;
}
public static Graph<Block/*!*/>/*!*/ GraphFromImpl(Implementation impl) {
Contract.Requires(impl != null);
Contract.Ensures(cce.NonNullElements(Contract.Result<Graph<Block>>().TopologicalSort()));
Contract.Ensures(Contract.Result<Graph<Block>>() != null);
Graph<Block/*!*/> g = new Graph<Block/*!*/>();
g.AddSource(impl.Blocks[0]); // there is always at least one node in the graph
foreach (Block b in impl.Blocks) {
Contract.Assert(b != null);
GotoCmd gtc = b.TransferCmd as GotoCmd;
if (gtc != null) {
foreach (Block/*!*/ dest in cce.NonNull(gtc.labelTargets)) {
Contract.Assert(dest != null);
g.AddEdge(b, dest);
}
}
}
return g;
}
public class IrreducibleLoopException : Exception {}
public Graph<Block> ProcessLoops(Implementation impl) {
while (true) {
impl.PruneUnreachableBlocks();
impl.ComputePredecessorsForBlocks();
Graph<Block/*!*/>/*!*/ g = GraphFromImpl(impl);
g.ComputeLoops();
if (g.Reducible) {
return g;
}
throw new IrreducibleLoopException();
#if USED_CODE
System.Diagnostics.Debug.Assert(g.SplitCandidates.Count > 0);
Block splitCandidate = null;
foreach (Block b in g.SplitCandidates) {
if (b.Predecessors.Length > 1) {
splitCandidate = b;
break;
}
}
System.Diagnostics.Debug.Assert(splitCandidate != null);
int count = 0;
foreach (Block b in splitCandidate.Predecessors) {
GotoCmd gotoCmd = (GotoCmd)b.TransferCmd;
gotoCmd.labelNames.Remove(splitCandidate.Label);
gotoCmd.labelTargets.Remove(splitCandidate);
CodeCopier codeCopier = new CodeCopier(new Hashtable(), new Hashtable());
List<Cmd> newCmdSeq = codeCopier.CopyCmdSeq(splitCandidate.Cmds);
TransferCmd newTransferCmd;
GotoCmd splitGotoCmd = splitCandidate.TransferCmd as GotoCmd;
if (splitGotoCmd == null) {
newTransferCmd = new ReturnCmd(splitCandidate.tok);
}
else {
List<String> newLabelNames = new List<String>();
newLabelNames.AddRange(splitGotoCmd.labelNames);
List<Block> newLabelTargets = new List<Block>();
newLabelTargets.AddRange(splitGotoCmd.labelTargets);
newTransferCmd = new GotoCmd(splitCandidate.tok, newLabelNames, newLabelTargets);
}
Block copy = new Block(splitCandidate.tok, splitCandidate.Label + count++, newCmdSeq, newTransferCmd);
impl.Blocks.Add(copy);
gotoCmd.AddTarget(copy);
}
#endif
}
}
public Dictionary<string, Dictionary<string, Block>> ExtractLoops()
{
HashSet<string> procsWithIrreducibleLoops = null;
return ExtractLoops(out procsWithIrreducibleLoops);
}
public Dictionary<string, Dictionary<string, Block>> ExtractLoops(out HashSet<string> procsWithIrreducibleLoops)
{
procsWithIrreducibleLoops = new HashSet<string>();
List<Implementation/*!*/>/*!*/ loopImpls = new List<Implementation/*!*/>();
Dictionary<string, Dictionary<string, Block>> fullMap = new Dictionary<string, Dictionary<string, Block>>();
foreach (Declaration d in this.TopLevelDeclarations)
{
Implementation impl = d as Implementation;
if (impl != null && impl.Blocks != null && impl.Blocks.Count > 0)
{
try
{
Graph<Block> g = ProcessLoops(impl);
CreateProceduresForLoops(impl, g, loopImpls, fullMap);
}
catch (IrreducibleLoopException)
{
System.Diagnostics.Debug.Assert(!fullMap.ContainsKey(impl.Name));
fullMap[impl.Name] = null;
procsWithIrreducibleLoops.Add(impl.Name);
// statically unroll loops in this procedure
// First, build a map of the current blocks
var origBlocks = new Dictionary<string, Block>();
foreach (var blk in impl.Blocks) origBlocks.Add(blk.Label, blk);
// unroll
Block start = impl.Blocks[0];
impl.Blocks = LoopUnroll.UnrollLoops(start, CommandLineOptions.Clo.RecursionBound, false);
// Now construct the "map back" information
// Resulting block label -> original block
var blockMap = new Dictionary<string, Block>();
foreach (var blk in impl.Blocks)
{
var sl = LoopUnroll.sanitizeLabel(blk.Label);
if (sl == blk.Label) blockMap.Add(blk.Label, blk);
else
{
Contract.Assert(origBlocks.ContainsKey(sl));
blockMap.Add(blk.Label, origBlocks[sl]);
}
}
fullMap[impl.Name] = blockMap;
}
}
}
foreach (Implementation/*!*/ loopImpl in loopImpls)
{
Contract.Assert(loopImpl != null);
TopLevelDeclarations.Add(loopImpl);
TopLevelDeclarations.Add(loopImpl.Proc);
}
return fullMap;
}
public override Absy StdDispatch(StandardVisitor visitor) {
//Contract.Requires(visitor != null);
Contract.Ensures(Contract.Result<Absy>() != null);
return visitor.VisitProgram(this);
}
private List<GlobalVariable/*!*/> globals = null;
public List<GlobalVariable/*!*/>/*!*/ GlobalVariables() {
Contract.Ensures(cce.NonNullElements(Contract.Result<List<GlobalVariable>>()));
if (globals != null)
return globals;
globals = new List<GlobalVariable/*!*/>();
foreach (Declaration d in TopLevelDeclarations) {
GlobalVariable gvar = d as GlobalVariable;
if (gvar != null)
globals.Add(gvar);
}
return globals;
}
private int invariantGenerationCounter = 0;
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 PredicateCmd CreateCandidateInvariant(Expr e, string tag = null, int StageId = 0) {
Constant ExistentialBooleanConstant = MakeExistentialBoolean(StageId);
IdentifierExpr ExistentialBoolean = new IdentifierExpr(Token.NoToken, ExistentialBooleanConstant);
PredicateCmd invariant = new AssertCmd(Token.NoToken, Expr.Imp(ExistentialBoolean, e));
if (tag != null)
invariant.Attributes = new QKeyValue(Token.NoToken, "tag", new List<object>(new object[] { tag }), null);
return invariant;
}
}
//---------------------------------------------------------------------
// Declarations
[ContractClass(typeof(DeclarationContracts))]
public abstract class Declaration : Absy {
public QKeyValue Attributes;
public Declaration(IToken tok)
: base(tok) {
Contract.Requires(tok != null);
}
protected void EmitAttributes(TokenTextWriter stream) {
Contract.Requires(stream != null);
for (QKeyValue kv = this.Attributes; kv != null; kv = kv.Next) {
kv.Emit(stream);
stream.Write(" ");
}
}
protected void ResolveAttributes(ResolutionContext rc) {
Contract.Requires(rc != null);
for (QKeyValue kv = this.Attributes; kv != null; kv = kv.Next) {
kv.Resolve(rc);
}
}
protected void TypecheckAttributes(TypecheckingContext rc) {
Contract.Requires(rc != null);
for (QKeyValue kv = this.Attributes; kv != null; kv = kv.Next) {
kv.Typecheck(rc);
}
}
/// <summary>
/// If the declaration has an attribute {:name} or {:name true}, then set "result" to "true" and return "true".
/// If the declaration has an attribute {:name false}, then set "result" to "false" and return "true".
/// Otherwise, return "false" and leave "result" unchanged (which gives the caller an easy way to indicate
/// a default value if the attribute is not mentioned).
/// If there is more than one attribute called :name, then the last attribute rules.
/// </summary>
public bool CheckBooleanAttribute(string name, ref bool result) {
Contract.Requires(name != null);
var kv = FindAttribute(name);
if (kv != null) {
if (kv.Params.Count == 0) {
result = true;
return true;
} else if (kv.Params.Count == 1) {
var lit = kv.Params[0] as LiteralExpr;
if (lit != null && lit.isBool) {
result = lit.asBool;
return true;
}
}
}
return false;
}
/// <summary>
/// Find and return the last occurrence of an attribute with the name "name", if any. If none, return null.
/// </summary>
public QKeyValue FindAttribute(string name) {
Contract.Requires(name != null);
QKeyValue res = null;
for (QKeyValue kv = this.Attributes; kv != null; kv = kv.Next) {
if (kv.Key == name) {
res = kv;
}
}
return res;
}
// Look for {:name expr} in list of attributes.
public Expr FindExprAttribute(string name) {
Contract.Requires(name != null);
Expr res = null;
for (QKeyValue kv = this.Attributes; kv != null; kv = kv.Next) {
if (kv.Key == name) {
if (kv.Params.Count == 1 && kv.Params[0] is Expr) {
res = (Expr)kv.Params[0];
}
}
}
return res;
}
// Look for {:name string} in list of attributes.
public string FindStringAttribute(string name) {
Contract.Requires(name != null);
return QKeyValue.FindStringAttribute(this.Attributes, name);
}
// Look for {:name N} or {:name N} in list of attributes. Return result in 'result'
// (which is not touched if there is no attribute specified).
//
// Returns false is there was an error processing the flag, true otherwise.
public bool CheckIntAttribute(string name, ref int result) {
Contract.Requires(name != null);
Expr expr = FindExprAttribute(name);
if (expr != null) {
if (expr is LiteralExpr && ((LiteralExpr)expr).isBigNum) {
result = ((LiteralExpr)expr).asBigNum.ToInt;
} else {
return false;
}
}
return true;
}
public void AddAttribute(string name, params object[] vals) {
Contract.Requires(name != null);
QKeyValue kv;
for (kv = this.Attributes; kv != null; kv = kv.Next) {
if (kv.Key == name) {
kv.Params.AddRange(vals);
break;
}
}
if (kv == null) {
Attributes = new QKeyValue(tok, name, new List<object/*!*/>(vals), Attributes);
}
}
public abstract void Emit(TokenTextWriter/*!*/ stream, int level);
public abstract void Register(ResolutionContext/*!*/ rc);
/// <summary>
/// Compute the strongly connected components of the declaration.
/// By default, it does nothing
/// </summary>
public virtual void ComputeStronglyConnectedComponents() { /* Does nothing */
}
/// <summary>
/// Reset the abstract stated computed before
/// </summary>
public virtual void ResetAbstractInterpretationState() { /* does nothing */
}
}
[ContractClassFor(typeof(Declaration))]
public abstract class DeclarationContracts : Declaration {
public DeclarationContracts() :base(null){
}
public override void Register(ResolutionContext rc) {
Contract.Requires(rc != null);
throw new NotImplementedException();
}
public override void Emit(TokenTextWriter stream, int level) {
Contract.Requires(stream != null);
throw new NotImplementedException();
}
}
public class Axiom : Declaration {
public Expr/*!*/ Expr;
[ContractInvariantMethod]
void ExprInvariant() {
Contract.Invariant(Expr != null);
}
public string Comment;
public Axiom(IToken tok, Expr expr)
: this(tok, expr, null) {
Contract.Requires(expr != null);
Contract.Requires(tok != null);
}
public Axiom(IToken/*!*/ tok, Expr/*!*/ expr, string comment)
: base(tok) {
Contract.Requires(tok != null);
Contract.Requires(expr != null);
Expr = expr;
Comment = comment;
}
public Axiom(IToken tok, Expr expr, string comment, QKeyValue kv)
: this(tok, expr, comment) {
Contract.Requires(expr != null);
Contract.Requires(tok != null);
this.Attributes = kv;
}
public override void Emit(TokenTextWriter stream, int level) {
//Contract.Requires(stream != null);
if (Comment != null) {
stream.WriteLine(this, level, "// " + Comment);
}
stream.Write(this, level, "axiom ");
EmitAttributes(stream);
this.Expr.Emit(stream);
stream.WriteLine(";");
}
public override void Register(ResolutionContext rc) {
//Contract.Requires(rc != null);
rc.AddAxiom(this);
}
public override void Resolve(ResolutionContext rc) {
//Contract.Requires(rc != null);
ResolveAttributes(rc);
rc.StateMode = ResolutionContext.State.StateLess;
Expr.Resolve(rc);
rc.StateMode = ResolutionContext.State.Single;
}
public override void Typecheck(TypecheckingContext tc) {
//Contract.Requires(tc != null);
TypecheckAttributes(tc);
Expr.Typecheck(tc);
Contract.Assert(Expr.Type != null); // follows from postcondition of Expr.Typecheck
if (!Expr.Type.Unify(Type.Bool)) {
tc.Error(this, "axioms must be of type bool");
}
}
public override Absy StdDispatch(StandardVisitor visitor) {
//Contract.Requires(visitor != null);
Contract.Ensures(Contract.Result<Absy>() != null);
return visitor.VisitAxiom(this);
}
}
public abstract class NamedDeclaration : Declaration {
private string/*!*/ name;
[ContractInvariantMethod]
void ObjectInvariant() {
Contract.Invariant(name != null);
}
public string/*!*/ Name {
get {
Contract.Ensures(Contract.Result<string>() != null);
return this.name;
}
set {
Contract.Requires(value != null);
this.name = value;
}
}
public int TimeLimit
{
get
{
int tl = CommandLineOptions.Clo.ProverKillTime;
CheckIntAttribute("timeLimit", ref tl);
return tl;
}
}
public NamedDeclaration(IToken/*!*/ tok, string/*!*/ name)
: base(tok) {
Contract.Requires(tok != null);
Contract.Requires(name != null);
this.name = name;
}
[Pure]
public override string ToString() {
Contract.Ensures(Contract.Result<string>() != null);
return cce.NonNull(Name);
}
}
public class TypeCtorDecl : NamedDeclaration {
public readonly int Arity;
public TypeCtorDecl(IToken/*!*/ tok, string/*!*/ name, int Arity)
: base(tok, name) {
Contract.Requires(tok != null);
Contract.Requires(name != null);
this.Arity = Arity;
}
public TypeCtorDecl(IToken/*!*/ tok, string/*!*/ name, int Arity, QKeyValue kv)
: base(tok, name) {
Contract.Requires(tok != null);
Contract.Requires(name != null);
this.Arity = Arity;
this.Attributes = kv;
}
public override void Emit(TokenTextWriter stream, int level) {
//Contract.Requires(stream != null);
stream.Write(this, level, "type ");
EmitAttributes(stream);
stream.Write("{0}", TokenTextWriter.SanitizeIdentifier(Name));
for (int i = 0; i < Arity; ++i)
stream.Write(" _");
stream.WriteLine(";");
}
public override void Register(ResolutionContext rc) {
//Contract.Requires(rc != null);
rc.AddType(this);
}
public override void Resolve(ResolutionContext rc) {
//Contract.Requires(rc != null);
ResolveAttributes(rc);
}
public override void Typecheck(TypecheckingContext tc) {
//Contract.Requires(tc != null);
TypecheckAttributes(tc);
}
public override Absy StdDispatch(StandardVisitor visitor) {
//Contract.Requires(visitor != null);
Contract.Ensures(Contract.Result<Absy>() != null);
return visitor.VisitTypeCtorDecl(this);
}
}
public class TypeSynonymDecl : NamedDeclaration {
public List<TypeVariable>/*!*/ TypeParameters;
public Type/*!*/ Body;
[ContractInvariantMethod]
void ObjectInvariant() {
Contract.Invariant(TypeParameters != null);
Contract.Invariant(Body != null);
}
public TypeSynonymDecl(IToken/*!*/ tok, string/*!*/ name,
List<TypeVariable>/*!*/ typeParams, Type/*!*/ body)
: base(tok, name) {
Contract.Requires(tok != null);
Contract.Requires(name != null);
Contract.Requires(typeParams != null);
Contract.Requires(body != null);
this.TypeParameters = typeParams;
this.Body = body;
}
public TypeSynonymDecl(IToken/*!*/ tok, string/*!*/ name,
List<TypeVariable>/*!*/ typeParams, Type/*!*/ body, QKeyValue kv)
: base(tok, name) {
Contract.Requires(tok != null);
Contract.Requires(name != null);
Contract.Requires(typeParams != null);
Contract.Requires(body != null);
this.TypeParameters = typeParams;
this.Body = body;
this.Attributes = kv;
}
public override void Emit(TokenTextWriter stream, int level) {
//Contract.Requires(stream != null);
stream.Write(this, level, "type ");
EmitAttributes(stream);
stream.Write("{0}", TokenTextWriter.SanitizeIdentifier(Name));
if (TypeParameters.Count > 0)
stream.Write(" ");
TypeParameters.Emit(stream, " ");
stream.Write(" = ");
Body.Emit(stream);
stream.WriteLine(";");
}
public override void Register(ResolutionContext rc) {
//Contract.Requires(rc != null);
rc.AddType(this);
}
public override void Resolve(ResolutionContext rc) {
//Contract.Requires(rc != null);
ResolveAttributes(rc);
int previousState = rc.TypeBinderState;
try {
foreach (TypeVariable/*!*/ v in TypeParameters) {
Contract.Assert(v != null);
rc.AddTypeBinder(v);
}
Body = Body.ResolveType(rc);
} finally {
rc.TypeBinderState = previousState;
}
}
public override void Typecheck(TypecheckingContext tc) {
//Contract.Requires(tc != null);
TypecheckAttributes(tc);
}
public static void ResolveTypeSynonyms(List<TypeSynonymDecl/*!*/>/*!*/ synonymDecls, ResolutionContext/*!*/ rc) {
Contract.Requires(cce.NonNullElements(synonymDecls));
Contract.Requires(rc != null);
// then discover all dependencies between type synonyms
IDictionary<TypeSynonymDecl/*!*/, List<TypeSynonymDecl/*!*/>/*!*/>/*!*/ deps =
new Dictionary<TypeSynonymDecl/*!*/, List<TypeSynonymDecl/*!*/>/*!*/>();
foreach (TypeSynonymDecl/*!*/ decl in synonymDecls) {
Contract.Assert(decl != null);
List<TypeSynonymDecl/*!*/>/*!*/ declDeps = new List<TypeSynonymDecl/*!*/>();
FindDependencies(decl.Body, declDeps, rc);
deps.Add(decl, declDeps);
}
List<TypeSynonymDecl/*!*/>/*!*/ resolved = new List<TypeSynonymDecl/*!*/>();
int unresolved = synonymDecls.Count - resolved.Count;
while (unresolved > 0) {
foreach (TypeSynonymDecl/*!*/ decl in synonymDecls) {
Contract.Assert(decl != null);
if (!resolved.Contains(decl) &&
deps[decl].All(d => resolved.Contains(d))) {
decl.Resolve(rc);
resolved.Add(decl);
}
}
int newUnresolved = synonymDecls.Count - resolved.Count;
if (newUnresolved < unresolved) {
// we are making progress
unresolved = newUnresolved;
} else {
// there have to be cycles in the definitions
foreach (TypeSynonymDecl/*!*/ decl in synonymDecls) {
Contract.Assert(decl != null);
if (!resolved.Contains(decl)) {
rc.Error(decl,
"type synonym could not be resolved because of cycles: {0}" +
" (replacing body with \"bool\" to continue resolving)",
decl.Name);
// we simply replace the bodies of all remaining type
// synonyms with "bool" so that resolution can continue
decl.Body = Type.Bool;
decl.Resolve(rc);
}
}
unresolved = 0;
}
}
}
// determine a list of all type synonyms that occur in "type"
private static void FindDependencies(Type/*!*/ type, List<TypeSynonymDecl/*!*/>/*!*/ deps, ResolutionContext/*!*/ rc) {
Contract.Requires(type != null);
Contract.Requires(cce.NonNullElements(deps));
Contract.Requires(rc != null);
if (type.IsVariable || type.IsBasic) {
// nothing
} else if (type.IsUnresolved) {
UnresolvedTypeIdentifier/*!*/ unresType = type.AsUnresolved;
Contract.Assert(unresType != null);
TypeSynonymDecl dep = rc.LookUpTypeSynonym(unresType.Name);
if (dep != null)
deps.Add(dep);
foreach (Type/*!*/ subtype in unresType.Arguments) {
Contract.Assert(subtype != null);
FindDependencies(subtype, deps, rc);
}
} else if (type.IsMap) {
MapType/*!*/ mapType = type.AsMap;
Contract.Assert(mapType != null);
foreach (Type/*!*/ subtype in mapType.Arguments) {
Contract.Assert(subtype != null);
FindDependencies(subtype, deps, rc);
}
FindDependencies(mapType.Result, deps, rc);
} else if (type.IsCtor) {
// this can happen because we allow types to be resolved multiple times
CtorType/*!*/ ctorType = type.AsCtor;
Contract.Assert(ctorType != null);
foreach (Type/*!*/ subtype in ctorType.Arguments) {
Contract.Assert(subtype != null);
FindDependencies(subtype, deps, rc);
}
} else {
System.Diagnostics.Debug.Fail("Did not expect this type during resolution: "
+ type);
}
}
public override Absy StdDispatch(StandardVisitor visitor) {
//Contract.Requires(visitor != null);
Contract.Ensures(Contract.Result<Absy>() != null);
return visitor.VisitTypeSynonymDecl(this);
}
}
public abstract class Variable : NamedDeclaration {
public TypedIdent/*!*/ TypedIdent;
[ContractInvariantMethod]
void ObjectInvariant() {
Contract.Invariant(TypedIdent != null);
}
public Variable(IToken/*!*/ tok, TypedIdent/*!*/ typedIdent)
: base(tok, typedIdent.Name) {
Contract.Requires(tok != null);
Contract.Requires(typedIdent != null);
this.TypedIdent = typedIdent;
}
public Variable(IToken/*!*/ tok, TypedIdent/*!*/ typedIdent, QKeyValue kv)
: base(tok, typedIdent.Name) {
Contract.Requires(tok != null);
Contract.Requires(typedIdent != null);
this.TypedIdent = typedIdent;
this.Attributes = kv;
}
public abstract bool IsMutable {
get;
}
public override void Emit(TokenTextWriter stream, int level) {
//Contract.Requires(stream != null);
stream.Write(this, level, "var ");
EmitVitals(stream, level, true);
stream.WriteLine(";");
}
public void EmitVitals(TokenTextWriter stream, int level, bool emitAttributes) {
Contract.Requires(stream != null);
if (emitAttributes) {
EmitAttributes(stream);
}
if (CommandLineOptions.Clo.PrintWithUniqueASTIds && this.TypedIdent.HasName) {
stream.Write("h{0}^^", this.GetHashCode()); // the idea is that this will prepend the name printed by TypedIdent.Emit
}
this.TypedIdent.Emit(stream);
}
public override void Resolve(ResolutionContext rc) {
//Contract.Requires(rc != null);
this.TypedIdent.Resolve(rc);
}
public void ResolveWhere(ResolutionContext rc) {
Contract.Requires(rc != null);
if (this.TypedIdent.WhereExpr != null) {
this.TypedIdent.WhereExpr.Resolve(rc);
}
ResolveAttributes(rc);
}
public override void Typecheck(TypecheckingContext tc) {
//Contract.Requires(tc != null);
TypecheckAttributes(tc);
this.TypedIdent.Typecheck(tc);
}
}
public class VariableComparer : IComparer {
public int Compare(object a, object b) {
Variable A = a as Variable;
Variable B = b as Variable;
if (A == null || B == null) {
throw new ArgumentException("VariableComparer works only on objects of type Variable");
}
return cce.NonNull(A.Name).CompareTo(B.Name);
}
}
// class to specify the <:-parents of the values of constants
public class ConstantParent {
public readonly IdentifierExpr/*!*/ Parent;
[ContractInvariantMethod]
void ObjectInvariant() {
Contract.Invariant(Parent != null);
}
// if true, the sub-dag underneath this constant-parent edge is
// disjoint from all other unique sub-dags
public readonly bool Unique;
public ConstantParent(IdentifierExpr parent, bool unique) {
Contract.Requires(parent != null);
Parent = parent;
Unique = unique;
}
}
public class Constant : Variable {
// when true, the value of this constant is meant to be distinct
// from all other constants.
public readonly bool Unique;
// the <:-parents of the value of this constant. If the field is
// null, no information about the parents is provided, which means
// that the parental situation is unconstrained.
public readonly List<ConstantParent/*!*/> Parents;
[ContractInvariantMethod]
void ObjectInvariant() {
Contract.Invariant(cce.NonNullElements(Parents, true));
}
// if true, it is assumed that the immediate <:-children of the
// value of this constant are completely specified
public readonly bool ChildrenComplete;
public Constant(IToken/*!*/ tok, TypedIdent/*!*/ typedIdent)
: base(tok, typedIdent) {
Contract.Requires(tok != null);
Contract.Requires(typedIdent != null);
Contract.Requires(typedIdent.Name != null && (!typedIdent.HasName || typedIdent.Name.Length > 0));
Contract.Requires(typedIdent.WhereExpr == null);
this.Unique = true;
this.Parents = null;
this.ChildrenComplete = false;
}
public Constant(IToken/*!*/ tok, TypedIdent/*!*/ typedIdent, bool unique)
: base(tok, typedIdent) {
Contract.Requires(tok != null);
Contract.Requires(typedIdent != null);
Contract.Requires(typedIdent.Name != null && typedIdent.Name.Length > 0);
Contract.Requires(typedIdent.WhereExpr == null);
this.Unique = unique;
this.Parents = null;
this.ChildrenComplete = false;
}
public Constant(IToken/*!*/ tok, TypedIdent/*!*/ typedIdent,
bool unique,
List<ConstantParent/*!*/> parents, bool childrenComplete,
QKeyValue kv)
: base(tok, typedIdent, kv) {
Contract.Requires(tok != null);
Contract.Requires(typedIdent != null);
Contract.Requires(parents == null || cce.NonNullElements(parents));
Contract.Requires(typedIdent.Name != null && typedIdent.Name.Length > 0);
Contract.Requires(typedIdent.WhereExpr == null);
this.Unique = unique;
this.Parents = parents;
this.ChildrenComplete = childrenComplete;
}
public override bool IsMutable {
get {
return false;
}
}
public override void Emit(TokenTextWriter stream, int level) {
//Contract.Requires(stream != null);
stream.Write(this, level, "const ");
EmitAttributes(stream);
if (this.Unique) {
stream.Write(this, level, "unique ");
}
EmitVitals(stream, level, false);
if (Parents != null || ChildrenComplete) {
stream.Write(this, level, " extends");
string/*!*/ sep = " ";
foreach (ConstantParent/*!*/ p in cce.NonNull(Parents)) {
Contract.Assert(p != null);
stream.Write(this, level, sep);
sep = ", ";
if (p.Unique)
stream.Write(this, level, "unique ");
p.Parent.Emit(stream);
}
if (ChildrenComplete)
stream.Write(this, level, " complete");
}
stream.WriteLine(";");
}
public override void Register(ResolutionContext rc) {
//Contract.Requires(rc != null);
rc.AddVariable(this, true);
}
public override void Resolve(ResolutionContext rc) {
//Contract.Requires(rc != null);
base.Resolve(rc);
if (Parents != null) {
foreach (ConstantParent/*!*/ p in Parents) {
Contract.Assert(p != null);
p.Parent.Resolve(rc);
if (p.Parent.Decl != null && !(p.Parent.Decl is Constant))
rc.Error(p.Parent, "the parent of a constant has to be a constant");
if (this.Equals(p.Parent.Decl))
rc.Error(p.Parent, "constant cannot be its own parent");
}
}
// check that no parent occurs twice
// (could be optimised)
if (Parents != null) {
for (int i = 0; i < Parents.Count; ++i) {
if (Parents[i].Parent.Decl != null) {
for (int j = i + 1; j < Parents.Count; ++j) {
if (Parents[j].Parent.Decl != null &&
cce.NonNull(Parents[i].Parent.Decl).Equals(Parents[j].Parent.Decl))
rc.Error(Parents[j].Parent,
"{0} occurs more than once as parent",
Parents[j].Parent.Decl);
}
}
}
}
}
public override void Typecheck(TypecheckingContext tc) {
//Contract.Requires(tc != null);
base.Typecheck(tc);
if (Parents != null) {
foreach (ConstantParent/*!*/ p in Parents) {
Contract.Assert(p != null);
p.Parent.Typecheck(tc);
if (!cce.NonNull(p.Parent.Decl).TypedIdent.Type.Unify(this.TypedIdent.Type))
tc.Error(p.Parent,
"parent of constant has incompatible type ({0} instead of {1})",
p.Parent.Decl.TypedIdent.Type, this.TypedIdent.Type);
}
}
}
public override Absy StdDispatch(StandardVisitor visitor) {
//Contract.Requires(visitor != null);
Contract.Ensures(Contract.Result<Absy>() != null);
return visitor.VisitConstant(this);
}
}
public class GlobalVariable : Variable {
public GlobalVariable(IToken/*!*/ tok, TypedIdent/*!*/ typedIdent)
: base(tok, typedIdent) {
Contract.Requires(tok != null);
Contract.Requires(typedIdent != null);
}
public GlobalVariable(IToken/*!*/ tok, TypedIdent/*!*/ typedIdent, QKeyValue kv)
: base(tok, typedIdent, kv) {
Contract.Requires(tok != null);
Contract.Requires(typedIdent != null);
}
public override bool IsMutable {
get {
return true;
}
}
public override void Register(ResolutionContext rc) {
//Contract.Requires(rc != null);
rc.AddVariable(this, true);
}
public override Absy StdDispatch(StandardVisitor visitor) {
//Contract.Requires(visitor != null);
Contract.Ensures(Contract.Result<Absy>() != null);
return visitor.VisitGlobalVariable(this);
}
}
public class Formal : Variable {
public bool InComing;
public Formal(IToken tok, TypedIdent typedIdent, bool incoming, QKeyValue kv)
: base(tok, typedIdent, kv) {
Contract.Requires(typedIdent != null);
Contract.Requires(tok != null);
InComing = incoming;
}
public Formal(IToken tok, TypedIdent typedIdent, bool incoming)
: this(tok, typedIdent, incoming, null) {
Contract.Requires(typedIdent != null);
Contract.Requires(tok != null);
}
public override bool IsMutable {
get {
return !InComing;
}
}
public override void Register(ResolutionContext rc) {
//Contract.Requires(rc != null);
rc.AddVariable(this, false);
}
/// <summary>
/// Given a sequence of Formal declarations, returns sequence of Formals like the given one but without where clauses
/// and without any attributes.
/// The Type of each Formal is cloned.
/// </summary>
public static List<Variable> StripWhereClauses(List<Variable> w) {
Contract.Requires(w != null);
Contract.Ensures(Contract.Result<List<Variable>>() != null);
List<Variable> s = new List<Variable>();
foreach (Variable/*!*/ v in w) {
Contract.Assert(v != null);
Formal f = (Formal)v;
TypedIdent ti = f.TypedIdent;
s.Add(new Formal(f.tok, new TypedIdent(ti.tok, ti.Name, ti.Type.CloneUnresolved()), f.InComing, null));
}
return s;
}
public override Absy StdDispatch(StandardVisitor visitor) {
//Contract.Requires(visitor != null);
Contract.Ensures(Contract.Result<Absy>() != null);
return visitor.VisitFormal(this);
}
}
public class LocalVariable : Variable {
public LocalVariable(IToken tok, TypedIdent typedIdent, QKeyValue kv)
: base(tok, typedIdent, kv) {
Contract.Requires(typedIdent != null);
Contract.Requires(tok != null);
}
public LocalVariable(IToken tok, TypedIdent typedIdent)
: base(tok, typedIdent, null) {
Contract.Requires(typedIdent != null);
Contract.Requires(tok != null);
}
public override bool IsMutable {
get {
return true;
}
}
public override void Register(ResolutionContext rc) {
//Contract.Requires(rc != null);
rc.AddVariable(this, false);
}
public override Absy StdDispatch(StandardVisitor visitor) {
//Contract.Requires(visitor != null);
Contract.Ensures(Contract.Result<Absy>() != null);
return visitor.VisitLocalVariable(this);
}
}
public class Incarnation : LocalVariable {
public int incarnationNumber;
public Incarnation(Variable/*!*/ var, int i) :
base(
var.tok,
new TypedIdent(var.TypedIdent.tok, var.TypedIdent.Name + "@" + i, var.TypedIdent.Type)
) {
Contract.Requires(var != null);
incarnationNumber = i;
}
}
public class BoundVariable : Variable {
public BoundVariable(IToken tok, TypedIdent typedIdent)
: base(tok, typedIdent) {
Contract.Requires(typedIdent != null);
Contract.Requires(tok != null);
Contract.Requires(typedIdent.WhereExpr == null);
}
public BoundVariable(IToken tok, TypedIdent typedIdent, QKeyValue kv)
: base(tok, typedIdent, kv) {
Contract.Requires(typedIdent != null);
Contract.Requires(tok != null);
Contract.Requires(typedIdent.WhereExpr == null);
}
public override bool IsMutable {
get {
return false;
}
}
public override void Register(ResolutionContext rc) {
//Contract.Requires(rc != null);
rc.AddVariable(this, false);
}
public override Absy StdDispatch(StandardVisitor visitor) {
//Contract.Requires(visitor != null);
Contract.Ensures(Contract.Result<Absy>() != null);
return visitor.VisitBoundVariable(this);
}
}
public abstract class DeclWithFormals : NamedDeclaration {
public List<TypeVariable>/*!*/ TypeParameters;
public /*readonly--except in StandardVisitor*/ List<Variable>/*!*/ InParams, OutParams;
[ContractInvariantMethod]
void ObjectInvariant() {
Contract.Invariant(TypeParameters != null);
Contract.Invariant(InParams != null);
Contract.Invariant(OutParams != null);
}
public DeclWithFormals(IToken tok, string name, List<TypeVariable> typeParams,
List<Variable> inParams, List<Variable> outParams)
: base(tok, name) {
Contract.Requires(inParams != null);
Contract.Requires(outParams != null);
Contract.Requires(typeParams != null);
Contract.Requires(name != null);
Contract.Requires(tok != null);
this.TypeParameters = typeParams;
this.InParams = inParams;
this.OutParams = outParams;
}
protected DeclWithFormals(DeclWithFormals that)
: base(that.tok, cce.NonNull(that.Name)) {
Contract.Requires(that != null);
this.TypeParameters = that.TypeParameters;
this.InParams = that.InParams;
this.OutParams = that.OutParams;
}
public string Checksum
{
get
{
return FindStringAttribute("checksum");
}
}
public string DependenciesChecksum { get; set; }
protected void EmitSignature(TokenTextWriter stream, bool shortRet) {
Contract.Requires(stream != null);
Type.EmitOptionalTypeParams(stream, TypeParameters);
stream.Write("(");
InParams.Emit(stream, true);
stream.Write(")");
if (shortRet) {
Contract.Assert(OutParams.Count == 1);
stream.Write(" : ");
cce.NonNull(OutParams[0]).TypedIdent.Type.Emit(stream);
} else if (OutParams.Count > 0) {
stream.Write(" returns (");
OutParams.Emit(stream, true);
stream.Write(")");
}
}
// Register all type parameters at the resolution context
protected void RegisterTypeParameters(ResolutionContext rc) {
Contract.Requires(rc != null);
foreach (TypeVariable/*!*/ v in TypeParameters) {
Contract.Assert(v != null);
rc.AddTypeBinder(v);
}
}
protected void SortTypeParams() {
List<Type>/*!*/ allTypes = new List<Type>(InParams.Select(Item => Item.TypedIdent.Type).ToArray());
Contract.Assert(allTypes != null);
allTypes.AddRange(new List<Type>(OutParams.Select(Item => Item.TypedIdent.Type).ToArray()));
TypeParameters = Type.SortTypeParams(TypeParameters, allTypes, null);
}
/// <summary>
/// Adds the given formals to the current variable context, and then resolves
/// the types of those formals. Does NOT resolve the where clauses of the
/// formals.
/// Relies on the caller to first create, and later tear down, that variable
/// context.
/// </summary>
/// <param name="rc"></param>
protected void RegisterFormals(List<Variable> formals, ResolutionContext rc) {
Contract.Requires(rc != null);
Contract.Requires(formals != null);
foreach (Formal/*!*/ f in formals) {
Contract.Assert(f != null);
if (f.Name != TypedIdent.NoName) {
rc.AddVariable(f, false);
}
f.Resolve(rc);
}
}
/// <summary>
/// Resolves the where clauses (and attributes) of the formals.
/// </summary>
/// <param name="rc"></param>
protected void ResolveFormals(List<Variable> formals, ResolutionContext rc) {
Contract.Requires(rc != null);
Contract.Requires(formals != null);
foreach (Formal/*!*/ f in formals) {
Contract.Assert(f != null);
f.ResolveWhere(rc);
}
}
public override void Typecheck(TypecheckingContext tc) {
//Contract.Requires(tc != null);
TypecheckAttributes(tc);
foreach (Formal/*!*/ p in InParams) {
Contract.Assert(p != null);
p.Typecheck(tc);
}
foreach (Formal/*!*/ p in OutParams) {
Contract.Assert(p != null);
p.Typecheck(tc);
}
}
}
public class DatatypeConstructor : Function {
public List<DatatypeSelector> selectors;
public DatatypeMembership membership;
public DatatypeConstructor(Function func)
: base(func.tok, func.Name, func.TypeParameters, func.InParams, func.OutParams[0], func.Comment, func.Attributes)
{
selectors = new List<DatatypeSelector>();
}
public override void Resolve(ResolutionContext rc) {
HashSet<string> selectorNames = new HashSet<string>();
foreach (DatatypeSelector selector in selectors) {
if (selector.Name.StartsWith("#")) {
rc.Error(selector.tok, "The selector must be a non-empty string");
}
else {
if (selectorNames.Contains(selector.Name))
rc.Error(this.tok, "The selectors for a constructor must be distinct strings");
else
selectorNames.Add(selector.Name);
}
}
base.Resolve(rc);
}
public override void Typecheck(TypecheckingContext tc) {
CtorType outputType = this.OutParams[0].TypedIdent.Type as CtorType;
if (outputType == null || !outputType.IsDatatype()) {
tc.Error(tok, "The output type of a constructor must be a datatype");
}
base.Typecheck(tc);
}
}
public class DatatypeSelector : Function {
public Function constructor;
public int index;
public DatatypeSelector(Function constructor, int index)
: base(constructor.InParams[index].tok,
constructor.InParams[index].Name + "#" + constructor.Name,
new List<Variable> { new Formal(constructor.tok, new TypedIdent(constructor.tok, "", constructor.OutParams[0].TypedIdent.Type), true) },
new Formal(constructor.tok, new TypedIdent(constructor.tok, "", constructor.InParams[index].TypedIdent.Type), false))
{
this.constructor = constructor;
this.index = index;
}
public override void Emit(TokenTextWriter stream, int level) { }
}
public class DatatypeMembership : Function {
public Function constructor;
public DatatypeMembership(Function constructor)
: base(constructor.tok,
"is#" + constructor.Name,
new List<Variable> { new Formal(constructor.tok, new TypedIdent(constructor.tok, "", constructor.OutParams[0].TypedIdent.Type), true) },
new Formal(constructor.tok, new TypedIdent(constructor.tok, "", Type.Bool), false))
{
this.constructor = constructor;
}
public override void Emit(TokenTextWriter stream, int level) { }
}
public class Function : DeclWithFormals {
public string Comment;
// the body is only set if the function is declared with {:inline}
public Expr Body;
public Axiom DefinitionAxiom;
public bool doingExpansion;
private bool neverTrigger;
private bool neverTriggerComputed;
public Function(IToken tok, string name, List<Variable> args, Variable result)
: this(tok, name, new List<TypeVariable>(), args, result, null) {
Contract.Requires(result != null);
Contract.Requires(args != null);
Contract.Requires(name != null);
Contract.Requires(tok != null);
//:this(tok, name, new List<TypeVariable>(), args, result, null);
}
public Function(IToken tok, string name, List<TypeVariable> typeParams, List<Variable> args, Variable result)
: this(tok, name, typeParams, args, result, null) {
Contract.Requires(result != null);
Contract.Requires(args != null);
Contract.Requires(typeParams != null);
Contract.Requires(name != null);
Contract.Requires(tok != null);
//:this(tok, name, typeParams, args, result, null);
}
public Function(IToken tok, string name, List<Variable> args, Variable result, string comment)
: this(tok, name, new List<TypeVariable>(), args, result, comment) {
Contract.Requires(result != null);
Contract.Requires(args != null);
Contract.Requires(name != null);
Contract.Requires(tok != null);
//:this(tok, name, new List<TypeVariable>(), args, result, comment);
}
public Function(IToken tok, string name, List<TypeVariable> typeParams, List<Variable> args, Variable/*!*/ result, string comment)
: base(tok, name, typeParams, args, new List<Variable> { result }) {
Contract.Requires(result != null);
Contract.Requires(args != null);
Contract.Requires(typeParams != null);
Contract.Requires(name != null);
Contract.Requires(tok != null);
Comment = comment;
}
public Function(IToken tok, string name, List<TypeVariable> typeParams, List<Variable> args, Variable result,
string comment, QKeyValue kv)
: this(tok, name, typeParams, args, result, comment) {
Contract.Requires(args != null);
Contract.Requires(result != null);
Contract.Requires(typeParams != null);
Contract.Requires(name != null);
Contract.Requires(tok != null);
//:this(tok, name, typeParams, args, result, comment);
this.Attributes = kv;
}
public override void Emit(TokenTextWriter stream, int level) {
//Contract.Requires(stream != null);
if (Comment != null) {
stream.WriteLine(this, level, "// " + Comment);
}
stream.Write(this, level, "function ");
EmitAttributes(stream);
if (Body != null && !QKeyValue.FindBoolAttribute(Attributes, "inline")) {
// Boogie inlines any function whose .Body field is non-null. The parser populates the .Body field
// is the :inline attribute is present, but if someone creates the Boogie file directly as an AST, then
// the :inline attribute may not be there. We'll make sure it's printed, so one can see that this means
// that the body will be inlined.
stream.Write("{:inline} ");
}
if (CommandLineOptions.Clo.PrintWithUniqueASTIds) {
stream.Write("h{0}^^{1}", this.GetHashCode(), TokenTextWriter.SanitizeIdentifier(this.Name));
} else {
stream.Write("{0}", TokenTextWriter.SanitizeIdentifier(this.Name));
}
EmitSignature(stream, true);
if (Body != null) {
stream.WriteLine();
stream.WriteLine("{");
stream.Write(level + 1, "");
Body.Emit(stream);
stream.WriteLine();
stream.WriteLine("}");
} else {
stream.WriteLine(";");
}
}
public override void Register(ResolutionContext rc) {
//Contract.Requires(rc != null);
rc.AddProcedure(this);
}
public override void Resolve(ResolutionContext rc) {
//Contract.Requires(rc != null);
int previousTypeBinderState = rc.TypeBinderState;
try {
RegisterTypeParameters(rc);
rc.PushVarContext();
RegisterFormals(InParams, rc);
RegisterFormals(OutParams, rc);
ResolveAttributes(rc);
if (Body != null)
{
rc.StateMode = ResolutionContext.State.StateLess;
Body.Resolve(rc);
rc.StateMode = ResolutionContext.State.Single;
}
rc.PopVarContext();
Type.CheckBoundVariableOccurrences(TypeParameters,
new List<Type>(InParams.Select(Item => Item.TypedIdent.Type).ToArray()),
new List<Type>(OutParams.Select(Item => Item.TypedIdent.Type).ToArray()),
this.tok, "function arguments",
rc);
} finally {
rc.TypeBinderState = previousTypeBinderState;
}
SortTypeParams();
}
public override void Typecheck(TypecheckingContext tc) {
//Contract.Requires(tc != null);
// PR: why was the base call left out previously?
base.Typecheck(tc);
// TypecheckAttributes(tc);
if (Body != null) {
Body.Typecheck(tc);
if (!cce.NonNull(Body.Type).Unify(cce.NonNull(OutParams[0]).TypedIdent.Type))
tc.Error(Body,
"function body with invalid type: {0} (expected: {1})",
Body.Type, cce.NonNull(OutParams[0]).TypedIdent.Type);
}
}
public bool NeverTrigger {
get {
if (!neverTriggerComputed) {
this.CheckBooleanAttribute("never_pattern", ref neverTrigger);
neverTriggerComputed = true;
}
return neverTrigger;
}
}
public override Absy StdDispatch(StandardVisitor visitor) {
//Contract.Requires(visitor != null);
Contract.Ensures(Contract.Result<Absy>() != null);
return visitor.VisitFunction(this);
}
public Axiom CreateDefinitionAxiom(Expr definition, QKeyValue kv = null) {
Contract.Requires(definition != null);
List<Variable> dummies = new List<Variable>();
List<Expr> callArgs = new List<Expr>();
int i = 0;
foreach (Formal/*!*/ f in InParams) {
Contract.Assert(f != null);
string nm = f.TypedIdent.HasName ? f.TypedIdent.Name : "_" + i;
dummies.Add(new BoundVariable(f.tok, new TypedIdent(f.tok, nm, f.TypedIdent.Type)));
callArgs.Add(new IdentifierExpr(f.tok, nm));
i++;
}
List<TypeVariable>/*!*/ quantifiedTypeVars = new List<TypeVariable>();
foreach (TypeVariable/*!*/ t in TypeParameters) {
Contract.Assert(t != null);
quantifiedTypeVars.Add(new TypeVariable(Token.NoToken, t.Name));
}
Expr call = new NAryExpr(tok, new FunctionCall(new IdentifierExpr(tok, Name)), callArgs);
// specify the type of the function, because it might be that
// type parameters only occur in the output type
call = Expr.CoerceType(tok, call, (Type)OutParams[0].TypedIdent.Type.Clone());
Expr def = Expr.Eq(call, definition);
if (quantifiedTypeVars.Count != 0 || dummies.Count != 0) {
def = new ForallExpr(tok, quantifiedTypeVars, dummies,
kv,
new Trigger(tok, true, new List<Expr> { call }, null),
def);
}
DefinitionAxiom = new Axiom(tok, def);
return DefinitionAxiom;
}
}
public class Macro : Function {
public Macro(IToken tok, string name, List<Variable> args, Variable result)
: base(tok, name, args, result) { }
}
public class Requires : Absy, IPotentialErrorNode {
public readonly bool Free;
public Expr/*!*/ Condition;
public string Comment;
[ContractInvariantMethod]
void ObjectInvariant() {
Contract.Invariant(Condition != null);
Contract.Invariant(errorData == null || errorData is string);
}
// TODO: convert to use generics
private object errorData;
public object ErrorData {
get {
return errorData;
}
set {
errorData = value;
}
}
private MiningStrategy errorDataEnhanced;
public MiningStrategy ErrorDataEnhanced {
get {
return errorDataEnhanced;
}
set {
errorDataEnhanced = value;
}
}
public QKeyValue Attributes;
public String ErrorMessage {
get {
return QKeyValue.FindStringAttribute(Attributes, "msg");
}
}
public Requires(IToken token, bool free, Expr condition, string comment, QKeyValue kv)
: base(token) {
Contract.Requires(condition != null);
Contract.Requires(token != null);
this.Free = free;
this.Condition = condition;
this.Comment = comment;
this.Attributes = kv;
}
public Requires(IToken token, bool free, Expr condition, string comment)
: this(token, free, condition, comment, null) {
Contract.Requires(condition != null);
Contract.Requires(token != null);
//:this(token, free, condition, comment, null);
}
public Requires(bool free, Expr condition)
: this(Token.NoToken, free, condition, null) {
Contract.Requires(condition != null);
//:this(Token.NoToken, free, condition, null);
}
public Requires(bool free, Expr condition, string comment)
: this(Token.NoToken, free, condition, comment) {
Contract.Requires(condition != null);
//:this(Token.NoToken, free, condition, comment);
}
public void Emit(TokenTextWriter stream, int level) {
Contract.Requires(stream != null);
if (Comment != null) {
stream.WriteLine(this, level, "// " + Comment);
}
stream.Write(this, level, "{0}requires ", Free ? "free " : "");
Cmd.EmitAttributes(stream, Attributes);
this.Condition.Emit(stream);
stream.WriteLine(";");
}
public override void Resolve(ResolutionContext rc) {
//Contract.Requires(rc != null);
this.Condition.Resolve(rc);
}
public override void Typecheck(TypecheckingContext tc) {
//Contract.Requires(tc != null);
this.Condition.Typecheck(tc);
Contract.Assert(this.Condition.Type != null); // follows from postcondition of Expr.Typecheck
if (!this.Condition.Type.Unify(Type.Bool)) {
tc.Error(this, "preconditions must be of type bool");
}
}
}
public class Ensures : Absy, IPotentialErrorNode {
public readonly bool Free;
public Expr/*!*/ Condition;
[ContractInvariantMethod]
void ObjectInvariant() {
Contract.Invariant(Condition != null);
Contract.Invariant(errorData == null || errorData is string);
}
public string Comment;
// TODO: convert to use generics
private object errorData;
public object ErrorData {
get {
return errorData;
}
set {
errorData = value;
}
}
private MiningStrategy errorDataEnhanced;
public MiningStrategy ErrorDataEnhanced {
get {
return errorDataEnhanced;
}
set {
errorDataEnhanced = value;
}
}
public String ErrorMessage {
get {
return QKeyValue.FindStringAttribute(Attributes, "msg");
}
}
public QKeyValue Attributes;
public Ensures(IToken token, bool free, Expr/*!*/ condition, string comment, QKeyValue kv)
: base(token) {
Contract.Requires(condition != null);
Contract.Requires(token != null);
this.Free = free;
this.Condition = condition;
this.Comment = comment;
this.Attributes = kv;
}
public Ensures(IToken token, bool free, Expr condition, string comment)
: this(token, free, condition, comment, null) {
Contract.Requires(condition != null);
Contract.Requires(token != null);
//:this(token, free, condition, comment, null);
}
public Ensures(bool free, Expr condition)
: this(Token.NoToken, free, condition, null) {
Contract.Requires(condition != null);
//:this(Token.NoToken, free, condition, null);
}
public Ensures(bool free, Expr condition, string comment)
: this(Token.NoToken, free, condition, comment) {
Contract.Requires(condition != null);
//:this(Token.NoToken, free, condition, comment);
}
public void Emit(TokenTextWriter stream, int level) {
Contract.Requires(stream != null);
if (Comment != null) {
stream.WriteLine(this, level, "// " + Comment);
}
stream.Write(this, level, "{0}ensures ", Free ? "free " : "");
Cmd.EmitAttributes(stream, Attributes);
this.Condition.Emit(stream);
stream.WriteLine(";");
}
public override void Resolve(ResolutionContext rc) {
//Contract.Requires(rc != null);
this.Condition.Resolve(rc);
}
public override void Typecheck(TypecheckingContext tc) {
//Contract.Requires(tc != null);
this.Condition.Typecheck(tc);
Contract.Assert(this.Condition.Type != null); // follows from postcondition of Expr.Typecheck
if (!this.Condition.Type.Unify(Type.Bool)) {
tc.Error(this, "postconditions must be of type bool");
}
}
}
public class Procedure : DeclWithFormals {
public List<Requires>/*!*/ Requires;
public List<IdentifierExpr>/*!*/ Modifies;
public List<Ensures>/*!*/ Ensures;
[ContractInvariantMethod]
void ObjectInvariant() {
Contract.Invariant(Requires != null);
Contract.Invariant(Modifies != null);
Contract.Invariant(Ensures != null);
Contract.Invariant(Summary != null);
}
// Abstract interpretation: Procedure-specific invariants...
[Rep]
public readonly ProcedureSummary/*!*/ Summary;
public Procedure(IToken/*!*/ tok, string/*!*/ name, List<TypeVariable>/*!*/ typeParams, List<Variable>/*!*/ inParams, List<Variable>/*!*/ outParams,
List<Requires>/*!*/ requires, List<IdentifierExpr>/*!*/ modifies, List<Ensures>/*!*/ ensures)
: this(tok, name, typeParams, inParams, outParams, requires, modifies, ensures, null) {
Contract.Requires(tok != null);
Contract.Requires(name != null);
Contract.Requires(typeParams != null);
Contract.Requires(inParams != null);
Contract.Requires(outParams != null);
Contract.Requires(requires != null);
Contract.Requires(modifies != null);
Contract.Requires(ensures != null);
//:this(tok, name, typeParams, inParams, outParams, requires, modifies, ensures, null);
}
public Procedure(IToken/*!*/ tok, string/*!*/ name, List<TypeVariable>/*!*/ typeParams, List<Variable>/*!*/ inParams, List<Variable>/*!*/ outParams,
List<Requires>/*!*/ @requires, List<IdentifierExpr>/*!*/ @modifies, List<Ensures>/*!*/ @ensures, QKeyValue kv
)
: base(tok, name, typeParams, inParams, outParams) {
Contract.Requires(tok != null);
Contract.Requires(name != null);
Contract.Requires(typeParams != null);
Contract.Requires(inParams != null);
Contract.Requires(outParams != null);
Contract.Requires(@requires != null);
Contract.Requires(@modifies != null);
Contract.Requires(@ensures != null);
this.Requires = @requires;
this.Modifies = @modifies;
this.Ensures = @ensures;
this.Summary = new ProcedureSummary();
this.Attributes = kv;
}
public override void Emit(TokenTextWriter stream, int level) {
//Contract.Requires(stream != null);
stream.Write(this, level, "procedure ");
EmitAttributes(stream);
stream.Write(this, level, "{0}", TokenTextWriter.SanitizeIdentifier(this.Name));
EmitSignature(stream, false);
stream.WriteLine(";");
level++;
foreach (Requires/*!*/ e in this.Requires) {
Contract.Assert(e != null);
e.Emit(stream, level);
}
if (this.Modifies.Count > 0) {
stream.Write(level, "modifies ");
this.Modifies.Emit(stream, false);
stream.WriteLine(";");
}
foreach (Ensures/*!*/ e in this.Ensures) {
Contract.Assert(e != null);
e.Emit(stream, level);
}
if (!CommandLineOptions.Clo.IntraproceduralInfer) {
for (int s = 0; s < this.Summary.Count; s++) {
ProcedureSummaryEntry/*!*/ entry = cce.NonNull(this.Summary[s]);
stream.Write(level + 1, "// ");
stream.WriteLine();
}
}
stream.WriteLine();
stream.WriteLine();
}
public override void Register(ResolutionContext rc) {
//Contract.Requires(rc != null);
rc.AddProcedure(this);
}
public override void Resolve(ResolutionContext rc) {
//Contract.Requires(rc != null);
rc.PushVarContext();
foreach (IdentifierExpr/*!*/ ide in Modifies) {
Contract.Assert(ide != null);
ide.Resolve(rc);
}
int previousTypeBinderState = rc.TypeBinderState;
try {
RegisterTypeParameters(rc);
RegisterFormals(InParams, rc);
ResolveFormals(InParams, rc); // "where" clauses of in-parameters are resolved without the out-parameters in scope
foreach (Requires/*!*/ e in Requires) {
Contract.Assert(e != null);
e.Resolve(rc);
}
RegisterFormals(OutParams, rc);
ResolveFormals(OutParams, rc); // "where" clauses of out-parameters are resolved with both in- and out-parametes in scope
rc.StateMode = ResolutionContext.State.Two;
foreach (Ensures/*!*/ e in Ensures) {
Contract.Assert(e != null);
e.Resolve(rc);
}
rc.StateMode = ResolutionContext.State.Single;
ResolveAttributes(rc);
Type.CheckBoundVariableOccurrences(TypeParameters,
new List<Type>(InParams.Select(Item => Item.TypedIdent.Type).ToArray()),
new List<Type>(OutParams.Select(Item => Item.TypedIdent.Type).ToArray()),
this.tok, "procedure arguments",
rc);
} finally {
rc.TypeBinderState = previousTypeBinderState;
}
rc.PopVarContext();
SortTypeParams();
}
public override void Typecheck(TypecheckingContext tc) {
//Contract.Requires(tc != null);
base.Typecheck(tc);
foreach (IdentifierExpr/*!*/ ide in Modifies) {
Contract.Assert(ide != null);
Contract.Assume(ide.Decl != null);
if (!ide.Decl.IsMutable) {
tc.Error(this, "modifies list contains constant: {0}", ide.Name);
}
ide.Typecheck(tc);
}
foreach (Requires/*!*/ e in Requires) {
Contract.Assert(e != null);
e.Typecheck(tc);
}
foreach (Ensures/*!*/ e in Ensures) {
Contract.Assert(e != null);
e.Typecheck(tc);
}
}
public override Absy StdDispatch(StandardVisitor visitor) {
//Contract.Requires(visitor != null);
Contract.Ensures(Contract.Result<Absy>() != null);
return visitor.VisitProcedure(this);
}
}
public class LoopProcedure : Procedure
{
public Implementation enclosingImpl;
private Dictionary<Block, Block> blockMap;
private Dictionary<string, Block> blockLabelMap;
public LoopProcedure(Implementation impl, Block header,
List<Variable> inputs, List<Variable> outputs, List<IdentifierExpr> globalMods)
: base(Token.NoToken, impl.Name + "_loop_" + header.ToString(),
new List<TypeVariable>(), inputs, outputs,
new List<Requires>(), globalMods, new List<Ensures>())
{
enclosingImpl = impl;
}
public void setBlockMap(Dictionary<Block, Block> bm)
{
blockMap = bm;
blockLabelMap = new Dictionary<string, Block>();
foreach (var kvp in bm)
{
blockLabelMap.Add(kvp.Key.Label, kvp.Value);
}
}
public Block getBlock(string label)
{
if (blockLabelMap.ContainsKey(label)) return blockLabelMap[label];
return null;
}
}
public class Implementation : DeclWithFormals {
public List<Variable>/*!*/ LocVars;
[Rep]
public StmtList StructuredStmts;
[Rep]
public List<Block/*!*/>/*!*/ Blocks;
public Procedure Proc;
// Blocks before applying passification etc.
// Both are used only when /inline is set.
public List<Block/*!*/> OriginalBlocks;
public List<Variable> OriginalLocVars;
// Strongly connected components
private StronglyConnectedComponents<Block/*!*/> scc;
[ContractInvariantMethod]
void ObjectInvariant() {
Contract.Invariant(LocVars != null);
Contract.Invariant(cce.NonNullElements(Blocks));
Contract.Invariant(cce.NonNullElements(OriginalBlocks, true));
Contract.Invariant(cce.NonNullElements(scc, true));
}
private bool BlockPredecessorsComputed;
public bool StronglyConnectedComponentsComputed {
get {
return this.scc != null;
}
}
public bool SkipVerification {
get {
bool verify = true;
cce.NonNull(this.Proc).CheckBooleanAttribute("verify", ref verify);
this.CheckBooleanAttribute("verify", ref verify);
if (!verify) {
return true;
}
if (CommandLineOptions.Clo.ProcedureInlining == CommandLineOptions.Inlining.Assert ||
CommandLineOptions.Clo.ProcedureInlining == CommandLineOptions.Inlining.Assume) {
Expr inl = this.FindExprAttribute("inline");
if (inl == null)
inl = this.Proc.FindExprAttribute("inline");
if (inl != null && inl is LiteralExpr && ((LiteralExpr)inl).isBigNum && ((LiteralExpr)inl).asBigNum.Signum > 0) {
return true;
}
}
if (CommandLineOptions.Clo.StratifiedInlining > 0) {
return !QKeyValue.FindBoolAttribute(Attributes, "entrypoint");
}
return false;
}
}
public string Id
{
get
{
var id = FindStringAttribute("id");
if (id == null)
{
id = Name + GetHashCode().ToString() + ":0";
}
return id;
}
}
public int Priority
{
get
{
int priority = 0;
CheckIntAttribute("priority", ref priority);
if (priority <= 0)
{
priority = 1;
}
return priority;
}
}
public Implementation(IToken tok, string name, List<TypeVariable> typeParams, List<Variable> inParams, List<Variable> outParams, List<Variable> localVariables, [Captured] StmtList structuredStmts, QKeyValue kv)
: this(tok, name, typeParams, inParams, outParams, localVariables, structuredStmts, kv, new Errors()) {
Contract.Requires(structuredStmts != null);
Contract.Requires(localVariables != null);
Contract.Requires(outParams != null);
Contract.Requires(inParams != null);
Contract.Requires(typeParams != null);
Contract.Requires(name != null);
Contract.Requires(tok != null);
//:this(tok, name, typeParams, inParams, outParams, localVariables, structuredStmts, null, new Errors());
}
public Implementation(IToken tok, string name, List<TypeVariable> typeParams, List<Variable> inParams, List<Variable> outParams, List<Variable> localVariables, [Captured] StmtList structuredStmts)
: this(tok, name, typeParams, inParams, outParams, localVariables, structuredStmts, null, new Errors()) {
Contract.Requires(structuredStmts != null);
Contract.Requires(localVariables != null);
Contract.Requires(outParams != null);
Contract.Requires(inParams != null);
Contract.Requires(typeParams != null);
Contract.Requires(name != null);
Contract.Requires(tok != null);
//:this(tok, name, typeParams, inParams, outParams, localVariables, structuredStmts, null, new Errors());
}
public Implementation(IToken tok, string name, List<TypeVariable> typeParams, List<Variable> inParams, List<Variable> outParams, List<Variable> localVariables, [Captured] StmtList structuredStmts, Errors errorHandler)
: this(tok, name, typeParams, inParams, outParams, localVariables, structuredStmts, null, errorHandler) {
Contract.Requires(errorHandler != null);
Contract.Requires(structuredStmts != null);
Contract.Requires(localVariables != null);
Contract.Requires(outParams != null);
Contract.Requires(inParams != null);
Contract.Requires(typeParams != null);
Contract.Requires(name != null);
Contract.Requires(tok != null);
//:this(tok, name, typeParams, inParams, outParams, localVariables, structuredStmts, null, errorHandler);
}
public Implementation(IToken/*!*/ tok,
string/*!*/ name,
List<TypeVariable>/*!*/ typeParams,
List<Variable>/*!*/ inParams,
List<Variable>/*!*/ outParams,
List<Variable>/*!*/ localVariables,
[Captured] StmtList/*!*/ structuredStmts,
QKeyValue kv,
Errors/*!*/ errorHandler)
: base(tok, name, typeParams, inParams, outParams) {
Contract.Requires(tok != null);
Contract.Requires(name != null);
Contract.Requires(typeParams != null);
Contract.Requires(inParams != null);
Contract.Requires(outParams != null);
Contract.Requires(localVariables != null);
Contract.Requires(structuredStmts != null);
Contract.Requires(errorHandler != null);
LocVars = localVariables;
StructuredStmts = structuredStmts;
BigBlocksResolutionContext ctx = new BigBlocksResolutionContext(structuredStmts, errorHandler);
Blocks = ctx.Blocks;
BlockPredecessorsComputed = false;
scc = null;
Attributes = kv;
}
public Implementation(IToken tok, string name, List<TypeVariable> typeParams, List<Variable> inParams, List<Variable> outParams, List<Variable> localVariables, [Captured] List<Block/*!*/> block)
: this(tok, name, typeParams, inParams, outParams, localVariables, block, null) {
Contract.Requires(cce.NonNullElements(block));
Contract.Requires(localVariables != null);
Contract.Requires(outParams != null);
Contract.Requires(inParams != null);
Contract.Requires(typeParams != null);
Contract.Requires(name != null);
Contract.Requires(tok != null);
//:this(tok, name, typeParams, inParams, outParams, localVariables, block, null);
}
public Implementation(IToken/*!*/ tok,
string/*!*/ name,
List<TypeVariable>/*!*/ typeParams,
List<Variable>/*!*/ inParams,
List<Variable>/*!*/ outParams,
List<Variable>/*!*/ localVariables,
[Captured] List<Block/*!*/>/*!*/ blocks,
QKeyValue kv)
: base(tok, name, typeParams, inParams, outParams) {
Contract.Requires(name != null);
Contract.Requires(inParams != null);
Contract.Requires(outParams != null);
Contract.Requires(localVariables != null);
Contract.Requires(cce.NonNullElements(blocks));
LocVars = localVariables;
Blocks = blocks;
BlockPredecessorsComputed = false;
scc = null;
Attributes = kv;
}
public override void Emit(TokenTextWriter stream, int level) {
//Contract.Requires(stream != null);
stream.Write(this, level, "implementation ");
EmitAttributes(stream);
stream.Write(this, level, "{0}", TokenTextWriter.SanitizeIdentifier(this.Name));
EmitSignature(stream, false);
stream.WriteLine();
stream.WriteLine(level, "{0}", '{');
foreach (Variable/*!*/ v in this.LocVars) {
Contract.Assert(v != null);
v.Emit(stream, level + 1);
}
if (this.StructuredStmts != null && !CommandLineOptions.Clo.PrintInstrumented && !CommandLineOptions.Clo.PrintInlined) {
if (this.LocVars.Count > 0) {
stream.WriteLine();
}
if (CommandLineOptions.Clo.PrintUnstructured < 2) {
if (CommandLineOptions.Clo.PrintUnstructured == 1) {
stream.WriteLine(this, level + 1, "/*** structured program:");
}
this.StructuredStmts.Emit(stream, level + 1);
if (CommandLineOptions.Clo.PrintUnstructured == 1) {
stream.WriteLine(level + 1, "**** end structured program */");
}
}
}
if (this.StructuredStmts == null || 1 <= CommandLineOptions.Clo.PrintUnstructured ||
CommandLineOptions.Clo.PrintInstrumented || CommandLineOptions.Clo.PrintInlined) {
foreach (Block b in this.Blocks) {
b.Emit(stream, level + 1);
}
}
stream.WriteLine(level, "{0}", '}');
stream.WriteLine();
stream.WriteLine();
}
public override void Register(ResolutionContext rc) {
//Contract.Requires(rc != null);
// nothing to register
}
public override void Resolve(ResolutionContext rc) {
//Contract.Requires(rc != null);
if (Proc != null) {
// already resolved
return;
}
DeclWithFormals dwf = rc.LookUpProcedure(cce.NonNull(this.Name));
Proc = dwf as Procedure;
if (dwf == null) {
rc.Error(this, "implementation given for undeclared procedure: {0}", this.Name);
} else if (Proc == null) {
rc.Error(this, "implementations given for function, not procedure: {0}", this.Name);
}
int previousTypeBinderState = rc.TypeBinderState;
try {
RegisterTypeParameters(rc);
rc.PushVarContext();
RegisterFormals(InParams, rc);
RegisterFormals(OutParams, rc);
foreach (Variable/*!*/ v in LocVars) {
Contract.Assert(v != null);
v.Register(rc);
v.Resolve(rc);
}
foreach (Variable/*!*/ v in LocVars) {
Contract.Assert(v != null);
v.ResolveWhere(rc);
}
rc.PushProcedureContext();
foreach (Block b in Blocks) {
b.Register(rc);
}
ResolveAttributes(rc);
rc.StateMode = ResolutionContext.State.Two;
foreach (Block b in Blocks) {
b.Resolve(rc);
}
rc.StateMode = ResolutionContext.State.Single;
rc.PopProcedureContext();
rc.PopVarContext();
Type.CheckBoundVariableOccurrences(TypeParameters,
new List<Type>(InParams.Select(Item => Item.TypedIdent.Type).ToArray()),
new List<Type>(OutParams.Select(Item => Item.TypedIdent.Type).ToArray()),
this.tok, "implementation arguments",
rc);
} finally {
rc.TypeBinderState = previousTypeBinderState;
}
SortTypeParams();
}
public override void Typecheck(TypecheckingContext tc) {
//Contract.Requires(tc != null);
base.Typecheck(tc);
Contract.Assume(this.Proc != null);
if (this.TypeParameters.Count != Proc.TypeParameters.Count) {
tc.Error(this, "mismatched number of type parameters in procedure implementation: {0}",
this.Name);
} else {
// if the numbers of type parameters are different, it is
// difficult to compare the argument types
MatchFormals(this.InParams, Proc.InParams, "in", tc);
MatchFormals(this.OutParams, Proc.OutParams, "out", tc);
}
foreach (Variable/*!*/ v in LocVars) {
Contract.Assert(v != null);
v.Typecheck(tc);
}
List<IdentifierExpr> oldFrame = tc.Frame;
tc.Frame = Proc.Modifies;
foreach (Block b in Blocks) {
b.Typecheck(tc);
}
Contract.Assert(tc.Frame == Proc.Modifies);
tc.Frame = oldFrame;
}
void MatchFormals(List<Variable>/*!*/ implFormals, List<Variable>/*!*/ procFormals, string/*!*/ inout, TypecheckingContext/*!*/ tc) {
Contract.Requires(implFormals != null);
Contract.Requires(procFormals != null);
Contract.Requires(inout != null);
Contract.Requires(tc != null);
if (implFormals.Count != procFormals.Count) {
tc.Error(this, "mismatched number of {0}-parameters in procedure implementation: {1}",
inout, this.Name);
} else {
// unify the type parameters so that types can be compared
Contract.Assert(Proc != null);
Contract.Assert(this.TypeParameters.Count == Proc.TypeParameters.Count);
IDictionary<TypeVariable/*!*/, Type/*!*/>/*!*/ subst1 =
new Dictionary<TypeVariable/*!*/, Type/*!*/>();
IDictionary<TypeVariable/*!*/, Type/*!*/>/*!*/ subst2 =
new Dictionary<TypeVariable/*!*/, Type/*!*/>();
for (int i = 0; i < this.TypeParameters.Count; ++i) {
TypeVariable/*!*/ newVar =
new TypeVariable(Token.NoToken, Proc.TypeParameters[i].Name);
Contract.Assert(newVar != null);
subst1.Add(Proc.TypeParameters[i], newVar);
subst2.Add(this.TypeParameters[i], newVar);
}
for (int i = 0; i < implFormals.Count; i++) {
// the names of the formals are allowed to change from the proc to the impl
// but types must be identical
Type t = cce.NonNull((Variable)implFormals[i]).TypedIdent.Type.Substitute(subst2);
Type u = cce.NonNull((Variable)procFormals[i]).TypedIdent.Type.Substitute(subst1);
if (!t.Equals(u)) {
string/*!*/ a = cce.NonNull((Variable)implFormals[i]).Name;
Contract.Assert(a != null);
string/*!*/ b = cce.NonNull((Variable)procFormals[i]).Name;
Contract.Assert(b != null);
string/*!*/ c;
if (a == b) {
c = a;
} else {
c = String.Format("{0} (named {1} in implementation)", b, a);
}
tc.Error(this, "mismatched type of {0}-parameter in implementation {1}: {2}", inout, this.Name, c);
}
}
}
}
private Dictionary<Variable, Expr>/*?*/ formalMap = null;
public void ResetImplFormalMap() {
this.formalMap = null;
}
public Dictionary<Variable, Expr>/*!*/ GetImplFormalMap() {
Contract.Ensures(Contract.Result<Dictionary<Variable, Expr>>() != null);
if (this.formalMap != null)
return this.formalMap;
else {
Dictionary<Variable, Expr>/*!*/ map = new Dictionary<Variable, Expr> (InParams.Count + OutParams.Count);
Contract.Assume(this.Proc != null);
Contract.Assume(InParams.Count == Proc.InParams.Count);
for (int i = 0; i < InParams.Count; i++) {
Variable/*!*/ v = InParams[i];
Contract.Assert(v != null);
IdentifierExpr ie = new IdentifierExpr(v.tok, v);
Variable/*!*/ pv = Proc.InParams[i];
Contract.Assert(pv != null);
map.Add(pv, ie);
}
System.Diagnostics.Debug.Assert(OutParams.Count == Proc.OutParams.Count);
for (int i = 0; i < OutParams.Count; i++) {
Variable/*!*/ v = cce.NonNull(OutParams[i]);
IdentifierExpr ie = new IdentifierExpr(v.tok, v);
Variable pv = cce.NonNull(Proc.OutParams[i]);
map.Add(pv, ie);
}
this.formalMap = map;
if (CommandLineOptions.Clo.PrintWithUniqueASTIds) {
Console.WriteLine("Implementation.GetImplFormalMap on {0}:", this.Name);
using (TokenTextWriter stream = new TokenTextWriter("<console>", Console.Out, false)) {
foreach (var e in map) {
Console.Write(" ");
cce.NonNull((Variable/*!*/)e.Key).Emit(stream, 0);
Console.Write(" --> ");
cce.NonNull((Expr)e.Value).Emit(stream);
Console.WriteLine();
}
}
}
return map;
}
}
/// <summary>
/// Return a collection of blocks that are reachable from the block passed as a parameter.
/// The block must be defined in the current implementation
/// </summary>
public ICollection<Block/*!*/> GetConnectedComponents(Block startingBlock) {
Contract.Requires(startingBlock != null);
Contract.Ensures(cce.NonNullElements(Contract.Result<ICollection<Block>>(), true));
Contract.Assert(this.Blocks.Contains(startingBlock));
if (!this.BlockPredecessorsComputed)
ComputeStronglyConnectedComponents();
#if DEBUG_PRINT
System.Console.WriteLine("* Strongly connected components * \n{0} \n ** ", scc);
#endif
foreach (ICollection<Block/*!*/> component in cce.NonNull(this.scc)) {
foreach (Block/*!*/ b in component) {
Contract.Assert(b != null);
if (b == startingBlock) // We found the compontent that owns the startingblock
{
return component;
}
}
}
{
Contract.Assert(false);
throw new cce.UnreachableException();
} // if we are here, it means that the block is not in one of the components. This is an error.
}
/// <summary>
/// Compute the strongly connected compontents of the blocks in the implementation.
/// As a side effect, it also computes the "predecessor" relation for the block in the implementation
/// </summary>
override public void ComputeStronglyConnectedComponents() {
if (!this.BlockPredecessorsComputed)
ComputePredecessorsForBlocks();
Adjacency<Block/*!*/> next = new Adjacency<Block/*!*/>(Successors);
Adjacency<Block/*!*/> prev = new Adjacency<Block/*!*/>(Predecessors);
this.scc = new StronglyConnectedComponents<Block/*!*/>(this.Blocks, next, prev);
scc.Compute();
foreach (Block/*!*/ block in this.Blocks) {
Contract.Assert(block != null);
block.Predecessors = new List<Block>();
}
}
/// <summary>
/// Reset the abstract stated computed before
/// </summary>
override public void ResetAbstractInterpretationState() {
foreach (Block/*!*/ b in this.Blocks) {
Contract.Assert(b != null);
b.ResetAbstractInterpretationState();
}
}
/// <summary>
/// A private method used as delegate for the strongly connected components.
/// It return, given a node, the set of its successors
/// </summary>
private IEnumerable/*<Block!>*//*!*/ Successors(Block node) {
Contract.Requires(node != null);
Contract.Ensures(Contract.Result<IEnumerable>() != null);
GotoCmd gotoCmd = node.TransferCmd as GotoCmd;
if (gotoCmd != null) { // If it is a gotoCmd
Contract.Assert(gotoCmd.labelTargets != null);
return gotoCmd.labelTargets;
} else { // otherwise must be a ReturnCmd
Contract.Assert(node.TransferCmd is ReturnCmd);
return new List<Block/*!*/>();
}
}
/// <summary>
/// A private method used as delegate for the strongly connected components.
/// It return, given a node, the set of its predecessors
/// </summary>
private IEnumerable/*<Block!>*//*!*/ Predecessors(Block node) {
Contract.Requires(node != null);
Contract.Ensures(Contract.Result<IEnumerable>() != null);
Contract.Assert(this.BlockPredecessorsComputed);
return node.Predecessors;
}
/// <summary>
/// Compute the predecessor informations for the blocks
/// </summary>
public void ComputePredecessorsForBlocks() {
foreach (Block b in this.Blocks) {
b.Predecessors = new List<Block>();
}
foreach (Block b in this.Blocks) {
GotoCmd gtc = b.TransferCmd as GotoCmd;
if (gtc != null) {
Contract.Assert(gtc.labelTargets != null);
foreach (Block/*!*/ dest in gtc.labelTargets) {
Contract.Assert(dest != null);
dest.Predecessors.Add(b);
}
}
}
this.BlockPredecessorsComputed = true;
}
public void PruneUnreachableBlocks() {
ArrayList /*Block!*/ visitNext = new ArrayList /*Block!*/ ();
List<Block/*!*/> reachableBlocks = new List<Block/*!*/>();
HashSet<Block> reachable = new HashSet<Block>(); // the set of elements in "reachableBlocks"
visitNext.Add(this.Blocks[0]);
while (visitNext.Count != 0) {
Block b = cce.NonNull((Block)visitNext[visitNext.Count - 1]);
visitNext.RemoveAt(visitNext.Count - 1);
if (!reachable.Contains(b)) {
reachableBlocks.Add(b);
reachable.Add(b);
if (b.TransferCmd is GotoCmd) {
if (CommandLineOptions.Clo.PruneInfeasibleEdges) {
foreach (Cmd/*!*/ s in b.Cmds) {
Contract.Assert(s != null);
if (s is PredicateCmd) {
LiteralExpr e = ((PredicateCmd)s).Expr as LiteralExpr;
if (e != null && e.IsFalse) {
// This statement sequence will never reach the end, because of this "assume false" or "assert false".
// Hence, it does not reach its successors.
b.TransferCmd = new ReturnCmd(b.TransferCmd.tok);
goto NEXT_BLOCK;
}
}
}
}
// it seems that the goto statement at the end may be reached
foreach (Block succ in cce.NonNull((GotoCmd)b.TransferCmd).labelTargets) {
Contract.Assume(succ != null);
visitNext.Add(succ);
}
}
}
NEXT_BLOCK: {
}
}
this.Blocks = reachableBlocks;
}
public override Absy StdDispatch(StandardVisitor visitor) {
//Contract.Requires(visitor != null);
Contract.Ensures(Contract.Result<Absy>() != null);
return visitor.VisitImplementation(this);
}
}
public class TypedIdent : Absy {
public const string NoName = "";
public string/*!*/ Name;
public Type/*!*/ Type;
[ContractInvariantMethod]
void ObjectInvariant() {
Contract.Invariant(Name != null);
Contract.Invariant(Type != null);
}
public Expr WhereExpr;
// [NotDelayed]
public TypedIdent(IToken/*!*/ tok, string/*!*/ name, Type/*!*/ type)
: this(tok, name, type, null) {
Contract.Requires(tok != null);
Contract.Requires(name != null);
Contract.Requires(type != null);
Contract.Ensures(this.WhereExpr == null); //PM: needed to verify BoogiePropFactory.FreshBoundVariable
//:this(tok, name, type, null); // here for aesthetic reasons
}
// [NotDelayed]
public TypedIdent(IToken/*!*/ tok, string/*!*/ name, Type/*!*/ type, Expr whereExpr)
: base(tok) {
Contract.Requires(tok != null);
Contract.Requires(name != null);
Contract.Requires(type != null);
Contract.Ensures(this.WhereExpr == whereExpr);
this.Name = name;
this.Type = type;
this.WhereExpr = whereExpr;
}
public bool HasName {
get {
return this.Name != NoName;
}
}
public void Emit(TokenTextWriter stream) {
Contract.Requires(stream != null);
stream.SetToken(this);
if (this.Name != NoName) {
stream.Write("{0}: ", TokenTextWriter.SanitizeIdentifier(this.Name));
}
this.Type.Emit(stream);
if (this.WhereExpr != null) {
stream.Write(" where ");
this.WhereExpr.Emit(stream);
}
}
public override void Resolve(ResolutionContext rc) {
//Contract.Requires(rc != null);
// NOTE: WhereExpr needs to be resolved by the caller, because the caller must provide a modified ResolutionContext
this.Type = this.Type.ResolveType(rc);
}
public override void Typecheck(TypecheckingContext tc) {
//Contract.Requires(tc != null);
// type variables can occur when working with polymorphic functions/procedures
// if (!this.Type.IsClosed)
// tc.Error(this, "free variables in type of an identifier: {0}",
// this.Type.FreeVariables);
if (this.WhereExpr != null) {
this.WhereExpr.Typecheck(tc);
Contract.Assert(this.WhereExpr.Type != null); // follows from postcondition of Expr.Typecheck
if (!this.WhereExpr.Type.Unify(Type.Bool)) {
tc.Error(this, "where clauses must be of type bool");
}
}
}
public override Absy StdDispatch(StandardVisitor visitor) {
//Contract.Requires(visitor != null);
Contract.Ensures(Contract.Result<Absy>() != null);
return visitor.VisitTypedIdent(this);
}
}
#region Helper methods for generic Sequences
public static class TypeVariableSeqAlgorithms {
public static void AppendWithoutDups(this List<TypeVariable> tvs, List<TypeVariable> s1) {
Contract.Requires(s1 != null);
for (int i = 0; i < s1.Count; i++) {
TypeVariable/*!*/ next = s1[i];
Contract.Assert(next != null);
if (!tvs.Contains(next))
tvs.Add(next);
}
}
}
public static class Emitter {
public static void Emit(this List<Declaration/*!*/>/*!*/ decls, TokenTextWriter stream) {
Contract.Requires(stream != null);
Contract.Requires(cce.NonNullElements(decls));
bool first = true;
foreach (Declaration d in decls) {
if (d == null)
continue;
if (first) {
first = false;
} else {
stream.WriteLine();
}
d.Emit(stream, 0);
}
}
public static void Emit(this List<String> ss, TokenTextWriter stream) {
Contract.Requires(stream != null);
string sep = "";
foreach (string/*!*/ s in ss) {
Contract.Assert(s != null);
stream.Write(sep);
sep = ", ";
stream.Write(s);
}
}
public static void Emit(this List<Expr> ts, TokenTextWriter stream) {
Contract.Requires(stream != null);
string sep = "";
foreach (Expr/*!*/ e in ts) {
Contract.Assert(e != null);
stream.Write(sep);
sep = ", ";
e.Emit(stream);
}
}
public static void Emit(this List<IdentifierExpr> ids, TokenTextWriter stream, bool printWhereComments) {
Contract.Requires(stream != null);
string sep = "";
foreach (IdentifierExpr/*!*/ e in ids) {
Contract.Assert(e != null);
stream.Write(sep);
sep = ", ";
e.Emit(stream);
if (printWhereComments && e.Decl != null && e.Decl.TypedIdent.WhereExpr != null) {
stream.Write(" /* where ");
e.Decl.TypedIdent.WhereExpr.Emit(stream);
stream.Write(" */");
}
}
}
public static void Emit(this List<Variable> vs, TokenTextWriter stream, bool emitAttributes) {
Contract.Requires(stream != null);
string sep = "";
foreach (Variable/*!*/ v in vs) {
Contract.Assert(v != null);
stream.Write(sep);
sep = ", ";
v.EmitVitals(stream, 0, emitAttributes);
}
}
public static void Emit(this List<Type> tys, TokenTextWriter stream, string separator) {
Contract.Requires(separator != null);
Contract.Requires(stream != null);
string sep = "";
foreach (Type/*!*/ v in tys) {
Contract.Assert(v != null);
stream.Write(sep);
sep = separator;
v.Emit(stream);
}
}
public static void Emit(this List<TypeVariable> tvs, TokenTextWriter stream, string separator) {
Contract.Requires(separator != null);
Contract.Requires(stream != null);
string sep = "";
foreach (TypeVariable/*!*/ v in tvs) {
Contract.Assert(v != null);
stream.Write(sep);
sep = separator;
v.Emit(stream);
}
}
}
#endregion
#region Regular Expressions
// a data structure to recover the "program structure" from the flow graph
public abstract class RE : Cmd {
public RE()
: base(Token.NoToken) {
}
public override void AddAssignedVariables(List<Variable> vars) {
//Contract.Requires(vars != null);
throw new NotImplementedException();
}
}
public class AtomicRE : RE {
public Block/*!*/ b;
[ContractInvariantMethod]
void ObjectInvariant() {
Contract.Invariant(b != null);
}
public AtomicRE(Block block) {
Contract.Requires(block != null);
b = block;
}
public override void Resolve(ResolutionContext rc) {
//Contract.Requires(rc != null);
b.Resolve(rc);
}
public override void Typecheck(TypecheckingContext tc) {
//Contract.Requires(tc != null);
b.Typecheck(tc);
}
public override void Emit(TokenTextWriter stream, int level) {
//Contract.Requires(stream != null);
b.Emit(stream, level);
}
public override Absy StdDispatch(StandardVisitor visitor) {
//Contract.Requires(visitor != null);
Contract.Ensures(Contract.Result<Absy>() != null);
return visitor.VisitAtomicRE(this);
}
}
public abstract class CompoundRE : RE {
public override void Resolve(ResolutionContext rc) {
//Contract.Requires(rc != null);
return;
}
public override void Typecheck(TypecheckingContext tc) {
//Contract.Requires(tc != null);
return;
}
}
public class Sequential : CompoundRE {
public RE/*!*/ first;
public RE/*!*/ second;
[ContractInvariantMethod]
void ObjectInvariant() {
Contract.Invariant(first != null);
Contract.Invariant(second != null);
}
public Sequential(RE a, RE b) {
Contract.Requires(b != null);
Contract.Requires(a != null);
first = a;
second = b;
}
public override void Emit(TokenTextWriter stream, int level) {
//Contract.Requires(stream != null);
stream.WriteLine();
stream.WriteLine("{0};", Indent(level));
first.Emit(stream, level + 1);
second.Emit(stream, level + 1);
}
public override Absy StdDispatch(StandardVisitor visitor) {
//Contract.Requires(visitor != null);
Contract.Ensures(Contract.Result<Absy>() != null);
return visitor.VisitSequential(this);
}
}
public class Choice : CompoundRE {
[ContractInvariantMethod]
void ObjectInvariant() {
Contract.Invariant(rs != null);
}
public List<RE>/*!*/ rs;
public Choice(List<RE> operands) {
Contract.Requires(operands != null);
rs = operands;
}
public override void Emit(TokenTextWriter stream, int level) {
//Contract.Requires(stream != null);
stream.WriteLine();
stream.WriteLine("{0}[]", Indent(level));
foreach (RE/*!*/ r in rs) {
Contract.Assert(r != null);
r.Emit(stream, level + 1);
}
}
public override Absy StdDispatch(StandardVisitor visitor) {
//Contract.Requires(visitor != null);
Contract.Ensures(Contract.Result<Absy>() != null);
return visitor.VisitChoice(this);
}
}
public class DAG2RE {
public static RE Transform(Block b) {
Contract.Requires(b != null);
Contract.Ensures(Contract.Result<RE>() != null);
TransferCmd tc = b.TransferCmd;
if (tc is ReturnCmd) {
return new AtomicRE(b);
} else if (tc is GotoCmd) {
GotoCmd/*!*/ g = (GotoCmd)tc;
Contract.Assert(g != null);
Contract.Assume(g.labelTargets != null);
if (g.labelTargets.Count == 1) {
return new Sequential(new AtomicRE(b), Transform(cce.NonNull(g.labelTargets[0])));
} else {
List<RE> rs = new List<RE>();
foreach (Block/*!*/ target in g.labelTargets) {
Contract.Assert(target != null);
RE r = Transform(target);
rs.Add(r);
}
RE second = new Choice(rs);
return new Sequential(new AtomicRE(b), second);
}
} else {
Contract.Assume(false);
throw new cce.UnreachableException();
}
}
}
#endregion
// NOTE: This class is here for convenience, since this file's
// classes are used pretty much everywhere.
public class BoogieDebug {
public static bool DoPrinting = false;
public static void Write(string format, params object[] args) {
Contract.Requires(args != null);
Contract.Requires(format != null);
if (DoPrinting) {
Console.Error.Write(format, args);
}
}
public static void WriteLine(string format, params object[] args) {
Contract.Requires(args != null);
Contract.Requires(format != null);
if (DoPrinting) {
Console.Error.WriteLine(format, args);
}
}
public static void WriteLine() {
if (DoPrinting) {
Console.Error.WriteLine();
}
}
}
}
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