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using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.Boogie;
using System.Diagnostics;
using System.Diagnostics.Contracts;
namespace Microsoft.Boogie
{
class ProcedureInfo
{
// containsYield is true iff there is an implementation that contains a yield statement
public bool containsYield;
// isThreadStart is true iff there is an async call to the procedure
public bool isThreadStart;
// isEntrypoint is true iff the procedure is an entrypoint
public bool isEntrypoint;
// isAtomic is true if there are no yields transitively in any implementation
public bool isAtomic;
// inParallelCall is true iff this procedure is involved in some parallel call
public bool inParallelCall;
public ProcedureInfo()
{
containsYield = false;
isThreadStart = false;
isAtomic = true;
inParallelCall = false;
}
}
class AsyncAndYieldTraverser : StandardVisitor
{
Dictionary<string, ProcedureInfo> procNameToInfo = new Dictionary<string, ProcedureInfo>();
Implementation currentImpl = null;
public static Dictionary<string, ProcedureInfo> Traverse(Program program)
{
AsyncAndYieldTraverser traverser = new AsyncAndYieldTraverser();
traverser.VisitProgram(program);
return traverser.procNameToInfo;
}
public override Procedure VisitProcedure(Procedure node)
{
if (!procNameToInfo.ContainsKey(node.Name))
{
procNameToInfo[node.Name] = new ProcedureInfo();
}
if (QKeyValue.FindBoolAttribute(node.Attributes, "entrypoint"))
{
procNameToInfo[node.Name].isEntrypoint = true;
}
if (QKeyValue.FindBoolAttribute(node.Attributes, "yields"))
{
procNameToInfo[node.Name].isAtomic = false;
}
return base.VisitProcedure(node);
}
public override Implementation VisitImplementation(Implementation node)
{
currentImpl = node;
if (!procNameToInfo.ContainsKey(node.Name))
{
procNameToInfo[node.Name] = new ProcedureInfo();
}
if (QKeyValue.FindBoolAttribute(node.Attributes, "entrypoint"))
{
procNameToInfo[node.Name].isEntrypoint = true;
}
return base.VisitImplementation(node);
}
public override YieldCmd VisitYieldCmd(YieldCmd node)
{
procNameToInfo[currentImpl.Name].containsYield = true;
procNameToInfo[currentImpl.Name].isAtomic = false;
return base.VisitYieldCmd(node);
}
public override Cmd VisitCallCmd(CallCmd node)
{
if (!procNameToInfo.ContainsKey(node.Proc.Name))
{
procNameToInfo[node.Proc.Name] = new ProcedureInfo();
}
if (node.IsAsync)
{
procNameToInfo[node.Proc.Name].isThreadStart = true;
}
if (node.InParallelWith != null)
{
CallCmd iter = node;
while (iter != null)
{
if (!procNameToInfo.ContainsKey(iter.Proc.Name))
{
procNameToInfo[iter.Proc.Name] = new ProcedureInfo();
}
procNameToInfo[iter.Proc.Name].isThreadStart = true;
procNameToInfo[iter.Proc.Name].inParallelCall = true;
iter = iter.InParallelWith;
}
}
return base.VisitCallCmd(node);
}
}
class AtomicTraverser : StandardVisitor
{
Implementation currentImpl;
static Dictionary<string, ProcedureInfo> procNameToInfo;
static bool moreProcessingRequired;
public static void Traverse(Program program, Dictionary<string, ProcedureInfo> procNameToInfo)
{
AtomicTraverser.procNameToInfo = procNameToInfo;
do
{
moreProcessingRequired = false;
AtomicTraverser traverser = new AtomicTraverser();
traverser.VisitProgram(program);
} while (moreProcessingRequired);
}
public override Implementation VisitImplementation(Implementation node)
{
if (!procNameToInfo[node.Name].isAtomic)
return node;
currentImpl = node;
return base.VisitImplementation(node);
}
public override Cmd VisitCallCmd(CallCmd node)
{
ProcedureInfo info = procNameToInfo[node.callee];
if (node.InParallelWith != null || node.IsAsync || !info.isAtomic)
{
procNameToInfo[currentImpl.Name].isAtomic = false;
moreProcessingRequired = true;
}
return base.VisitCallCmd(node);
}
}
public class OwickiGriesTransform
{
Dictionary<string, ProcedureInfo> procNameToInfo;
List<IdentifierExpr> globalMods;
LinearTypechecker linearTypechecker;
Dictionary<string, Procedure> asyncAndParallelCallDesugarings;
List<Procedure> yieldCheckerProcs;
List<Implementation> yieldCheckerImpls;
Procedure yieldProc;
public OwickiGriesTransform(LinearTypechecker linearTypechecker)
{
this.linearTypechecker = linearTypechecker;
Program program = linearTypechecker.program;
procNameToInfo = AsyncAndYieldTraverser.Traverse(program);
AtomicTraverser.Traverse(program, procNameToInfo);
globalMods = new List<IdentifierExpr>();
foreach (Variable g in program.GlobalVariables())
{
globalMods.Add(new IdentifierExpr(Token.NoToken, g));
}
asyncAndParallelCallDesugarings = new Dictionary<string, Procedure>();
yieldCheckerProcs = new List<Procedure>();
yieldCheckerImpls = new List<Implementation>();
List<Variable> inputs = new List<Variable>();
foreach (string domainName in linearTypechecker.linearDomains.Keys)
{
var domain = linearTypechecker.linearDomains[domainName];
Formal f = new Formal(Token.NoToken, new TypedIdent(Token.NoToken, domainName + "_in", new MapType(Token.NoToken, new List<TypeVariable>(), new List<Type> { domain.elementType }, Type.Bool)), true);
inputs.Add(f);
}
foreach (IdentifierExpr ie in globalMods)
{
Formal f = new Formal(Token.NoToken, new TypedIdent(Token.NoToken, string.Format("og_global_old_{0}", ie.Decl.Name), ie.Decl.TypedIdent.Type), true);
inputs.Add(f);
}
yieldProc = new Procedure(Token.NoToken, "og_yield", new List<TypeVariable>(), inputs, new List<Variable>(), new List<Requires>(), new List<IdentifierExpr>(), new List<Ensures>());
yieldProc.AddAttribute("inline", new LiteralExpr(Token.NoToken, Microsoft.Basetypes.BigNum.FromInt(1)));
}
private void AddCallToYieldProc(List<Cmd> newCmds, Dictionary<Variable, Variable> ogOldGlobalMap, Dictionary<string, Variable> domainNameToLocalVar)
{
List<Expr> exprSeq = new List<Expr>();
foreach (string domainName in linearTypechecker.linearDomains.Keys)
{
exprSeq.Add(Expr.Ident(domainNameToLocalVar[domainName]));
}
foreach (IdentifierExpr ie in globalMods)
{
exprSeq.Add(Expr.Ident(ogOldGlobalMap[ie.Decl]));
}
CallCmd yieldCallCmd = new CallCmd(Token.NoToken, yieldProc.Name, exprSeq, new List<IdentifierExpr>());
yieldCallCmd.Proc = yieldProc;
newCmds.Add(yieldCallCmd);
}
private Dictionary<string, Expr> ComputeAvailableExprs(HashSet<Variable> availableLocalLinearVars, Dictionary<string, Variable> domainNameToInputVar)
{
Dictionary<string, Expr> domainNameToExpr = new Dictionary<string, Expr>();
foreach (var domainName in linearTypechecker.linearDomains.Keys)
{
var expr = new IdentifierExpr(Token.NoToken, domainNameToInputVar[domainName]);
expr.Resolve(new ResolutionContext(null));
expr.Typecheck(new TypecheckingContext(null));
domainNameToExpr[domainName] = expr;
}
foreach (Variable v in availableLocalLinearVars)
{
var domainName = linearTypechecker.FindDomainName(v);
var domain = linearTypechecker.linearDomains[domainName];
IdentifierExpr ie = new IdentifierExpr(Token.NoToken, v);
var expr = new NAryExpr(Token.NoToken, new FunctionCall(domain.mapOrBool), new List<Expr> { v.TypedIdent.Type is MapType ? ie : linearTypechecker.Singleton(ie, domainName), domainNameToExpr[domainName] });
expr.Resolve(new ResolutionContext(null));
expr.Typecheck(new TypecheckingContext(null));
domainNameToExpr[domainName] = expr;
}
return domainNameToExpr;
}
private void AddUpdatesToOldGlobalVars(List<Cmd> newCmds, Dictionary<Variable, Variable> ogOldGlobalMap, Dictionary<string, Variable> domainNameToLocalVar, Dictionary<string, Expr> domainNameToExpr)
{
List<AssignLhs> lhss = new List<AssignLhs>();
List<Expr> rhss = new List<Expr>();
foreach (var domainName in linearTypechecker.linearDomains.Keys)
{
lhss.Add(new SimpleAssignLhs(Token.NoToken, new IdentifierExpr(Token.NoToken, domainNameToLocalVar[domainName])));
rhss.Add(domainNameToExpr[domainName]);
}
foreach (Variable g in ogOldGlobalMap.Keys)
{
lhss.Add(new SimpleAssignLhs(Token.NoToken, Expr.Ident(ogOldGlobalMap[g])));
rhss.Add(new IdentifierExpr(Token.NoToken, g));
}
if (lhss.Count > 0)
{
newCmds.Add(new AssignCmd(Token.NoToken, lhss, rhss));
}
}
private void DesugarYield(YieldCmd yieldCmd, List<Cmd> cmds, List<Cmd> newCmds, Dictionary<Variable, Variable> ogOldGlobalMap, Dictionary<string, Variable> domainNameToInputVar, Dictionary<string, Variable> domainNameToLocalVar)
{
AddCallToYieldProc(newCmds, ogOldGlobalMap, domainNameToLocalVar);
if (globalMods.Count > 0)
{
newCmds.Add(new HavocCmd(Token.NoToken, globalMods));
}
Dictionary<string, Expr> domainNameToExpr = ComputeAvailableExprs(linearTypechecker.availableLocalLinearVars[yieldCmd], domainNameToInputVar);
AddUpdatesToOldGlobalVars(newCmds, ogOldGlobalMap, domainNameToLocalVar, domainNameToExpr);
for (int j = 0; j < cmds.Count; j++)
{
PredicateCmd predCmd = (PredicateCmd)cmds[j];
newCmds.Add(new AssumeCmd(Token.NoToken, predCmd.Expr));
}
}
public Procedure DesugarParallelCallCmd(CallCmd callCmd, out List<Expr> ins, out List<IdentifierExpr> outs)
{
List<string> parallelCalleeNames = new List<string>();
CallCmd iter = callCmd;
ins = new List<Expr>();
outs = new List<IdentifierExpr>();
while (iter != null)
{
parallelCalleeNames.Add(iter.Proc.Name);
ins.AddRange(iter.Ins);
outs.AddRange(iter.Outs);
iter = iter.InParallelWith;
}
parallelCalleeNames.Sort();
string procName = "og";
foreach (string calleeName in parallelCalleeNames)
{
procName = procName + "_" + calleeName;
}
if (asyncAndParallelCallDesugarings.ContainsKey(procName))
return asyncAndParallelCallDesugarings[procName];
List<Variable> inParams = new List<Variable>();
List<Variable> outParams = new List<Variable>();
List<Requires> requiresSeq = new List<Requires>();
List<Ensures> ensuresSeq = new List<Ensures>();
List<IdentifierExpr> ieSeq = new List<IdentifierExpr>();
int count = 0;
while (callCmd != null)
{
Dictionary<Variable, Expr> map = new Dictionary<Variable, Expr>();
foreach (Variable x in callCmd.Proc.InParams)
{
Variable y = new Formal(Token.NoToken, new TypedIdent(Token.NoToken, "og_" + count + x.Name, x.TypedIdent.Type), true);
inParams.Add(y);
map[x] = new IdentifierExpr(Token.NoToken, y);
}
foreach (Variable x in callCmd.Proc.OutParams)
{
Variable y = new Formal(Token.NoToken, new TypedIdent(Token.NoToken, "og_" + count + x.Name, x.TypedIdent.Type), false);
outParams.Add(y);
map[x] = new IdentifierExpr(Token.NoToken, y);
}
Contract.Assume(callCmd.Proc.TypeParameters.Count == 0);
Substitution subst = Substituter.SubstitutionFromHashtable(map);
foreach (Requires req in callCmd.Proc.Requires)
{
requiresSeq.Add(new Requires(req.Free, Substituter.Apply(subst, req.Condition)));
}
foreach (IdentifierExpr ie in callCmd.Proc.Modifies)
{
ieSeq.Add(ie);
}
foreach (Ensures ens in callCmd.Proc.Ensures)
{
ensuresSeq.Add(new Ensures(ens.Free, Substituter.Apply(subst, ens.Condition)));
}
count++;
callCmd = callCmd.InParallelWith;
}
Procedure proc = new Procedure(Token.NoToken, procName, new List<TypeVariable>(), inParams, outParams, requiresSeq, ieSeq, ensuresSeq);
asyncAndParallelCallDesugarings[procName] = proc;
return proc;
}
private void CreateYieldCheckerImpl(DeclWithFormals decl, List<List<Cmd>> yields, Dictionary<Variable, Expr> map)
{
if (yields.Count == 0) return;
Program program = linearTypechecker.program;
ProcedureInfo info = procNameToInfo[decl.Name];
List<Variable> locals = new List<Variable>();
List<Variable> inputs = new List<Variable>();
foreach (IdentifierExpr ie in map.Values)
{
locals.Add(ie.Decl);
}
for (int i = 0; i < decl.InParams.Count - linearTypechecker.linearDomains.Count; i++)
{
Variable inParam = decl.InParams[i];
Variable copy = new LocalVariable(Token.NoToken, new TypedIdent(Token.NoToken, inParam.Name, inParam.TypedIdent.Type));
locals.Add(copy);
map[decl.InParams[i]] = new IdentifierExpr(Token.NoToken, copy);
}
{
int i = decl.InParams.Count - linearTypechecker.linearDomains.Count;
foreach (string domainName in linearTypechecker.linearDomains.Keys)
{
Variable inParam = decl.InParams[i];
Variable copy = new Formal(Token.NoToken, new TypedIdent(Token.NoToken, inParam.Name, inParam.TypedIdent.Type), true);
inputs.Add(copy);
map[decl.InParams[i]] = new IdentifierExpr(Token.NoToken, copy);
i++;
}
}
for (int i = 0; i < decl.OutParams.Count; i++)
{
Variable outParam = decl.OutParams[i];
var copy = new LocalVariable(Token.NoToken, new TypedIdent(Token.NoToken, outParam.Name, outParam.TypedIdent.Type));
locals.Add(copy);
map[decl.OutParams[i]] = new IdentifierExpr(Token.NoToken, copy);
}
Dictionary<Variable, Expr> ogOldLocalMap = new Dictionary<Variable, Expr>();
Dictionary<Variable, Expr> assumeMap = new Dictionary<Variable, Expr>(map);
foreach (IdentifierExpr ie in globalMods)
{
Variable g = ie.Decl;
var copy = new LocalVariable(Token.NoToken, new TypedIdent(Token.NoToken, string.Format("og_local_old_{0}", g.Name), g.TypedIdent.Type));
locals.Add(copy);
ogOldLocalMap[g] = Expr.Ident(copy);
Formal f = new Formal(Token.NoToken, new TypedIdent(Token.NoToken, string.Format("og_global_old_{0}", g.Name), g.TypedIdent.Type), true);
inputs.Add(f);
assumeMap[g] = Expr.Ident(f);
}
Substitution assumeSubst = Substituter.SubstitutionFromHashtable(assumeMap);
Substitution oldSubst = Substituter.SubstitutionFromHashtable(ogOldLocalMap);
Substitution subst = Substituter.SubstitutionFromHashtable(map);
List<Block> yieldCheckerBlocks = new List<Block>();
List<String> labels = new List<String>();
List<Block> labelTargets = new List<Block>();
Block yieldCheckerBlock = new Block(Token.NoToken, "exit", new List<Cmd>(), new ReturnCmd(Token.NoToken));
labels.Add(yieldCheckerBlock.Label);
labelTargets.Add(yieldCheckerBlock);
yieldCheckerBlocks.Add(yieldCheckerBlock);
int yieldCount = 0;
foreach (List<Cmd> cs in yields)
{
var linearDomains = linearTypechecker.linearDomains;
List<Cmd> newCmds = new List<Cmd>();
foreach (Cmd cmd in cs)
{
PredicateCmd predCmd = (PredicateCmd)cmd;
newCmds.Add(new AssumeCmd(Token.NoToken, Substituter.ApplyReplacingOldExprs(assumeSubst, oldSubst, predCmd.Expr)));
}
foreach (Cmd cmd in cs)
{
PredicateCmd predCmd = (PredicateCmd)cmd;
var newExpr = Substituter.ApplyReplacingOldExprs(subst, oldSubst, predCmd.Expr);
if (predCmd is AssertCmd)
newCmds.Add(new AssertCmd(predCmd.tok, newExpr));
else
newCmds.Add(new AssumeCmd(Token.NoToken, newExpr));
}
newCmds.Add(new AssumeCmd(Token.NoToken, Expr.False));
yieldCheckerBlock = new Block(Token.NoToken, "L" + yieldCount++, newCmds, new ReturnCmd(Token.NoToken));
labels.Add(yieldCheckerBlock.Label);
labelTargets.Add(yieldCheckerBlock);
yieldCheckerBlocks.Add(yieldCheckerBlock);
}
yieldCheckerBlocks.Insert(0, new Block(Token.NoToken, "enter", new List<Cmd>(), new GotoCmd(Token.NoToken, labels, labelTargets)));
// Create the yield checker procedure
var yieldCheckerName = string.Format("{0}_YieldChecker_{1}", decl is Procedure ? "Proc" : "Impl", decl.Name);
var yieldCheckerProc = new Procedure(Token.NoToken, yieldCheckerName, decl.TypeParameters, inputs, new List<Variable>(), new List<Requires>(), new List<IdentifierExpr>(), new List<Ensures>());
yieldCheckerProc.AddAttribute("inline", new LiteralExpr(Token.NoToken, Microsoft.Basetypes.BigNum.FromInt(1)));
yieldCheckerProcs.Add(yieldCheckerProc);
// Create the yield checker implementation
var yieldCheckerImpl = new Implementation(Token.NoToken, yieldCheckerName, decl.TypeParameters, inputs, new List<Variable>(), locals, yieldCheckerBlocks);
yieldCheckerImpl.Proc = yieldCheckerProc;
yieldCheckerImpl.AddAttribute("inline", new LiteralExpr(Token.NoToken, Microsoft.Basetypes.BigNum.FromInt(1)));
yieldCheckerImpls.Add(yieldCheckerImpl);
}
private void TransformImpl(Implementation impl)
{
Program program = linearTypechecker.program;
ProcedureInfo info = procNameToInfo[impl.Name];
Dictionary<Variable, Expr> map = new Dictionary<Variable, Expr>();
foreach (Variable local in impl.LocVars)
{
var copy = new LocalVariable(Token.NoToken, new TypedIdent(Token.NoToken, local.Name, local.TypedIdent.Type));
map[local] = new IdentifierExpr(Token.NoToken, copy);
}
Dictionary<Variable, Variable> ogOldGlobalMap = new Dictionary<Variable, Variable>();
foreach (IdentifierExpr ie in globalMods)
{
Variable g = ie.Decl;
LocalVariable l = new LocalVariable(Token.NoToken, new TypedIdent(Token.NoToken, string.Format("og_global_old_{0}", g.Name), g.TypedIdent.Type));
ogOldGlobalMap[g] = l;
impl.LocVars.Add(l);
}
Dictionary<string, Variable> domainNameToInputVar = new Dictionary<string, Variable>();
Dictionary<string, Variable> domainNameToLocalVar = new Dictionary<string, Variable>();
{
int i = impl.InParams.Count - linearTypechecker.linearDomains.Count;
foreach (string domainName in linearTypechecker.linearDomains.Keys)
{
Variable inParam = impl.InParams[i];
domainNameToInputVar[domainName] = inParam;
Variable l = new LocalVariable(Token.NoToken, new TypedIdent(Token.NoToken, inParam.Name + "_local", inParam.TypedIdent.Type));
domainNameToLocalVar[domainName] = l;
impl.LocVars.Add(l);
i++;
}
}
// Collect the yield predicates and desugar yields
List<List<Cmd>> yields = new List<List<Cmd>>();
List<Cmd> cmds = new List<Cmd>();
foreach (Block b in impl.Blocks)
{
YieldCmd yieldCmd = null;
List<Cmd> newCmds = new List<Cmd>();
for (int i = 0; i < b.Cmds.Count; i++)
{
Cmd cmd = b.Cmds[i];
if (cmd is YieldCmd)
{
yieldCmd = (YieldCmd)cmd;
continue;
}
if (yieldCmd != null)
{
PredicateCmd pcmd = cmd as PredicateCmd;
if (pcmd == null)
{
DesugarYield(yieldCmd, cmds, newCmds, ogOldGlobalMap, domainNameToInputVar, domainNameToLocalVar);
if (cmds.Count > 0)
{
yields.Add(cmds);
cmds = new List<Cmd>();
}
yieldCmd = null;
}
else
{
cmds.Add(pcmd);
}
}
CallCmd callCmd = cmd as CallCmd;
if (callCmd != null)
{
if (callCmd.InParallelWith != null || callCmd.IsAsync || !procNameToInfo[callCmd.callee].isAtomic)
{
AddCallToYieldProc(newCmds, ogOldGlobalMap, domainNameToLocalVar);
}
if (callCmd.InParallelWith != null)
{
List<Expr> ins;
List<IdentifierExpr> outs;
Procedure dummyParallelCallDesugaring = DesugarParallelCallCmd(callCmd, out ins, out outs);
CallCmd dummyCallCmd = new CallCmd(Token.NoToken, dummyParallelCallDesugaring.Name, ins, outs);
dummyCallCmd.Proc = dummyParallelCallDesugaring;
newCmds.Add(dummyCallCmd);
}
else if (callCmd.IsAsync)
{
if (!asyncAndParallelCallDesugarings.ContainsKey(callCmd.Proc.Name))
{
asyncAndParallelCallDesugarings[callCmd.Proc.Name] = new Procedure(Token.NoToken, string.Format("DummyAsyncTarget_{0}", callCmd.Proc.Name), callCmd.Proc.TypeParameters, callCmd.Proc.InParams, callCmd.Proc.OutParams, callCmd.Proc.Requires, new List<IdentifierExpr>(), new List<Ensures>());
}
var dummyAsyncTargetProc = asyncAndParallelCallDesugarings[callCmd.Proc.Name];
CallCmd dummyCallCmd = new CallCmd(Token.NoToken, dummyAsyncTargetProc.Name, callCmd.Ins, callCmd.Outs);
dummyCallCmd.Proc = dummyAsyncTargetProc;
newCmds.Add(dummyCallCmd);
}
else
{
newCmds.Add(callCmd);
}
if (callCmd.InParallelWith != null || callCmd.IsAsync || !procNameToInfo[callCmd.callee].isAtomic)
{
HashSet<Variable> availableLocalLinearVars = new HashSet<Variable>(linearTypechecker.availableLocalLinearVars[callCmd]);
foreach (IdentifierExpr ie in callCmd.Outs)
{
if (linearTypechecker.FindDomainName(ie.Decl) == null) continue;
availableLocalLinearVars.Add(ie.Decl);
}
Dictionary<string, Expr> domainNameToExpr = ComputeAvailableExprs(availableLocalLinearVars, domainNameToInputVar);
AddUpdatesToOldGlobalVars(newCmds, ogOldGlobalMap, domainNameToLocalVar, domainNameToExpr);
}
}
else
{
newCmds.Add(cmd);
}
}
if (yieldCmd != null)
{
DesugarYield(yieldCmd, cmds, newCmds, ogOldGlobalMap, domainNameToInputVar, domainNameToLocalVar);
if (cmds.Count > 0)
{
yields.Add(cmds);
cmds = new List<Cmd>();
}
}
if (b.TransferCmd is ReturnCmd && (!info.isAtomic || info.isEntrypoint || info.isThreadStart))
{
AddCallToYieldProc(newCmds, ogOldGlobalMap, domainNameToLocalVar);
}
b.Cmds = newCmds;
}
if (!info.isAtomic)
{
// Loops
impl.PruneUnreachableBlocks();
impl.ComputePredecessorsForBlocks();
GraphUtil.Graph<Block> g = Program.GraphFromImpl(impl);
g.ComputeLoops();
if (g.Reducible)
{
foreach (Block header in g.Headers)
{
Dictionary<string, Expr> domainNameToExpr = ComputeAvailableExprs(linearTypechecker.availableLocalLinearVars[header], domainNameToInputVar);
foreach (Block pred in header.Predecessors)
{
AddCallToYieldProc(pred.Cmds, ogOldGlobalMap, domainNameToLocalVar);
AddUpdatesToOldGlobalVars(pred.Cmds, ogOldGlobalMap, domainNameToLocalVar, domainNameToExpr);
}
List<Cmd> newCmds = new List<Cmd>();
foreach (string domainName in linearTypechecker.linearDomains.Keys)
{
newCmds.Add(new AssumeCmd(Token.NoToken, Expr.Binary(BinaryOperator.Opcode.Eq, Expr.Ident(domainNameToLocalVar[domainName]), domainNameToExpr[domainName])));
}
foreach (Variable v in ogOldGlobalMap.Keys)
{
newCmds.Add(new AssumeCmd(Token.NoToken, Expr.Binary(BinaryOperator.Opcode.Eq, new IdentifierExpr(Token.NoToken, v), Expr.Ident(ogOldGlobalMap[v]))));
}
newCmds.AddRange(header.Cmds);
header.Cmds = newCmds;
}
}
}
if (!info.isAtomic || info.isEntrypoint || info.isThreadStart)
{
// Add initial block
List<AssignLhs> lhss = new List<AssignLhs>();
List<Expr> rhss = new List<Expr>();
Dictionary<string, Expr> domainNameToExpr = new Dictionary<string, Expr>();
foreach (var domainName in linearTypechecker.linearDomains.Keys)
{
domainNameToExpr[domainName] = new IdentifierExpr(Token.NoToken, domainNameToInputVar[domainName]);
}
for (int i = 0; i < impl.InParams.Count - linearTypechecker.linearDomains.Count; i++)
{
Variable v = impl.InParams[i];
var domainName = linearTypechecker.FindDomainName(v);
if (domainName == null) continue;
var domain = linearTypechecker.linearDomains[domainName];
IdentifierExpr ie = new IdentifierExpr(Token.NoToken, v);
domainNameToExpr[domainName] = new NAryExpr(Token.NoToken, new FunctionCall(domain.mapOrBool), new List<Expr> { v.TypedIdent.Type is MapType ? ie : linearTypechecker.Singleton(ie, domainName), domainNameToExpr[domainName] });
}
foreach (string domainName in linearTypechecker.linearDomains.Keys)
{
lhss.Add(new SimpleAssignLhs(Token.NoToken, new IdentifierExpr(Token.NoToken, domainNameToLocalVar[domainName])));
rhss.Add(domainNameToExpr[domainName]);
}
foreach (Variable g in ogOldGlobalMap.Keys)
{
lhss.Add(new SimpleAssignLhs(Token.NoToken, Expr.Ident(ogOldGlobalMap[g])));
rhss.Add(Expr.Ident(g));
}
if (lhss.Count > 0)
{
Block initBlock = new Block(Token.NoToken, "og_init", new List<Cmd> { new AssignCmd(Token.NoToken, lhss, rhss) }, new GotoCmd(Token.NoToken, new List<String> { impl.Blocks[0].Label }, new List<Block> { impl.Blocks[0] }));
impl.Blocks.Insert(0, initBlock);
}
}
CreateYieldCheckerImpl(impl, yields, map);
}
public void TransformProc(Procedure proc)
{
Program program = linearTypechecker.program;
ProcedureInfo info = procNameToInfo[proc.Name];
if (!info.isThreadStart) return;
Dictionary<string, Variable> domainNameToInputVar = new Dictionary<string, Variable>();
{
int i = proc.InParams.Count - linearTypechecker.linearDomains.Count;
foreach (string domainName in linearTypechecker.linearDomains.Keys)
{
Variable inParam = proc.InParams[i];
domainNameToInputVar[domainName] = inParam;
i++;
}
}
// Collect the yield predicates and desugar yields
List<List<Cmd>> yields = new List<List<Cmd>>();
List<Cmd> cmds = new List<Cmd>();
if (proc.Requires.Count > 0)
{
Dictionary<string, HashSet<Variable>> domainNameToScope = new Dictionary<string, HashSet<Variable>>();
foreach (var domainName in linearTypechecker.linearDomains.Keys)
{
domainNameToScope[domainName] = new HashSet<Variable>();
domainNameToScope[domainName].Add(domainNameToInputVar[domainName]);
}
foreach (Variable v in program.GlobalVariables())
{
var domainName = linearTypechecker.FindDomainName(v);
if (domainName == null) continue;
domainNameToScope[domainName].Add(v);
}
for (int i = 0; i < proc.InParams.Count - linearTypechecker.linearDomains.Count; i++)
{
Variable v = proc.InParams[i];
var domainName = linearTypechecker.FindDomainName(v);
if (domainName == null) continue;
domainNameToScope[domainName].Add(v);
}
foreach (string domainName in linearTypechecker.linearDomains.Keys)
{
cmds.Add(new AssumeCmd(Token.NoToken, linearTypechecker.DisjointnessExpr(domainName, domainNameToScope[domainName])));
}
foreach (Requires r in proc.Requires)
{
if (r.Free)
{
cmds.Add(new AssumeCmd(r.tok, r.Condition));
}
else
{
cmds.Add(new AssertCmd(r.tok, r.Condition));
}
}
yields.Add(cmds);
cmds = new List<Cmd>();
}
if (info.inParallelCall && proc.Ensures.Count > 0)
{
Dictionary<string, HashSet<Variable>> domainNameToScope = new Dictionary<string, HashSet<Variable>>();
foreach (var domainName in linearTypechecker.linearDomains.Keys)
{
domainNameToScope[domainName] = new HashSet<Variable>();
domainNameToScope[domainName].Add(domainNameToInputVar[domainName]);
}
foreach (Variable v in program.GlobalVariables())
{
var domainName = linearTypechecker.FindDomainName(v);
if (domainName == null) continue;
domainNameToScope[domainName].Add(v);
}
for (int i = 0; i < proc.OutParams.Count; i++)
{
Variable v = proc.OutParams[i];
var domainName = linearTypechecker.FindDomainName(v);
if (domainName == null) continue;
domainNameToScope[domainName].Add(v);
}
foreach (string domainName in linearTypechecker.linearDomains.Keys)
{
cmds.Add(new AssumeCmd(Token.NoToken, linearTypechecker.DisjointnessExpr(domainName, domainNameToScope[domainName])));
}
foreach (Ensures e in proc.Ensures)
{
if (e.Free)
{
cmds.Add(new AssumeCmd(e.tok, e.Condition));
}
else
{
cmds.Add(new AssertCmd(e.tok, e.Condition));
}
}
yields.Add(cmds);
cmds = new List<Cmd>();
}
CreateYieldCheckerImpl(proc, yields, new Dictionary<Variable, Expr>());
}
private void AddYieldProcAndImpl()
{
Program program = linearTypechecker.program;
List<Variable> inputs = new List<Variable>();
foreach (string domainName in linearTypechecker.linearDomains.Keys)
{
var domain = linearTypechecker.linearDomains[domainName];
Formal f = new Formal(Token.NoToken, new TypedIdent(Token.NoToken, domainName + "_in", new MapType(Token.NoToken, new List<TypeVariable>(), new List<Type> { domain.elementType }, Type.Bool)), true);
inputs.Add(f);
}
foreach (IdentifierExpr ie in globalMods)
{
Formal f = new Formal(Token.NoToken, new TypedIdent(Token.NoToken, string.Format("og_global_old_{0}", ie.Decl.Name), ie.Decl.TypedIdent.Type), true);
inputs.Add(f);
}
List<Block> blocks = new List<Block>();
TransferCmd transferCmd = new ReturnCmd(Token.NoToken);
if (yieldCheckerProcs.Count > 0)
{
List<Block> blockTargets = new List<Block>();
List<String> labelTargets = new List<String>();
int labelCount = 0;
foreach (Procedure proc in yieldCheckerProcs)
{
List<Expr> exprSeq = new List<Expr>();
foreach (Variable v in inputs)
{
exprSeq.Add(new IdentifierExpr(Token.NoToken, v));
}
CallCmd callCmd = new CallCmd(Token.NoToken, proc.Name, exprSeq, new List<IdentifierExpr>());
callCmd.Proc = proc;
string label = string.Format("L_{0}", labelCount++);
Block block = new Block(Token.NoToken, label, new List<Cmd> { callCmd }, new ReturnCmd(Token.NoToken));
labelTargets.Add(label);
blockTargets.Add(block);
blocks.Add(block);
}
transferCmd = new GotoCmd(Token.NoToken, labelTargets, blockTargets);
}
blocks.Insert(0, new Block(Token.NoToken, "enter", new List<Cmd>(), transferCmd));
var yieldImpl = new Implementation(Token.NoToken, yieldProc.Name, new List<TypeVariable>(), inputs, new List<Variable>(), new List<Variable>(), blocks);
yieldImpl.Proc = yieldProc;
yieldImpl.AddAttribute("inline", new LiteralExpr(Token.NoToken, Microsoft.Basetypes.BigNum.FromInt(1)));
program.TopLevelDeclarations.Add(yieldProc);
program.TopLevelDeclarations.Add(yieldImpl);
}
public void Transform()
{
Program program = linearTypechecker.program;
foreach (var decl in program.TopLevelDeclarations)
{
Procedure proc = decl as Procedure;
if (proc == null) continue;
TransformProc(proc);
}
foreach (var decl in program.TopLevelDeclarations)
{
Implementation impl = decl as Implementation;
if (impl == null) continue;
TransformImpl(impl);
}
foreach (Procedure proc in yieldCheckerProcs)
{
program.TopLevelDeclarations.Add(proc);
}
foreach (Implementation impl in yieldCheckerImpls)
{
program.TopLevelDeclarations.Add(impl);
}
foreach (Procedure proc in asyncAndParallelCallDesugarings.Values)
{
program.TopLevelDeclarations.Add(proc);
}
AddYieldProcAndImpl();
Microsoft.Boogie.ModSetCollector.DoModSetAnalysis(program);
}
}
}
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