private Implementation processImplementation(Implementation node)
{
varsRead = new VarsUsed();
// Gather the set of vars used
foreach (var b in node.Blocks)
{
base.VisitBlock(b);
}
globalsRead.UnionWith(varsRead.globalsUsed);
// Get rid of declarations (before variable slice adds new variables)
var newvars = new List <Variable>();
foreach (Variable v in node.LocVars)
{
if (varsRead.localsUsed.Contains(v.Name))
{
newvars.Add(v);
}
}
node.LocVars = newvars;
// Do VariableSlicing
VariableSlicing slice = new VariableSlicing(new VarSet(new HashSet <string>(varsRead.localsUsed), node.Name), ltinfo, node);
for (int i = 0; i < node.Blocks.Count; i++)
{
node.Blocks[i] = slice.VisitBlock(node.Blocks[i]);
}
varsRead = null;
return(node);
}
public UnReadVarEliminator(bool onlyLocals)
{
this.onlyLocals = onlyLocals;
varsRead = null;
globalsRead = null;
ltinfo = new ModifyTrans();
gtinfo = new ModifyTrans();
sliceGlobals = null;
}
public Program run(Program node)
{
globalsRead = new HashSet <string>();
// Typecheck -- needed for variable abstraction
if (node.Typecheck() != 0)
{
BoogieUtil.PrintProgram(node, "error.bpl");
throw new InternalError("Type errors");
}
// Go through all procedures and implementations (slice locals)
var TopLevelDeclarations = node.TopLevelDeclarations.ToList();
for (int i = 0; i < TopLevelDeclarations.Count; i++)
{
if (TopLevelDeclarations[i] is Implementation)
{
TopLevelDeclarations[i] = processImplementation(TopLevelDeclarations[i] as Implementation);
}
else if (TopLevelDeclarations[i] is Procedure)
{
processProcedure(TopLevelDeclarations[i] as Procedure);
}
}
node.TopLevelDeclarations = TopLevelDeclarations;
if (onlyLocals)
{
return(node);
}
sliceGlobals = new VariableSlicing(VarSet.ToVarSet(globalsRead, node), gtinfo);
node = sliceGlobals.VisitProgram(node);
BoogieUtil.DoModSetAnalysis(node);
return(node);
}
public VariableSlicePass(VarSet v)
{
tinfo = new ModifyTrans();
vslice = new VariableSlicing(v, tinfo);
passName = "Variable Slicing";
}