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//
// BlockStartGatherer.cs
//
// Authors:
// Alexander Chebaturkin (chebaturkin@gmail.com)
//
// Copyright (C) 2011 Alexander Chebaturkin
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using Mono.CodeContracts.Static.AST;
using Mono.CodeContracts.Static.AST.Visitors;
using Mono.CodeContracts.Static.DataStructures;
using Mono.CodeContracts.Static.Providers;
namespace Mono.CodeContracts.Static.ControlFlow.Subroutines.Builders {
class BlockStartGatherer<Label> : ILVisitorBase<Label, Dummy, Dummy, Dummy, bool>,
IAggregateVisitor<Label, Dummy, bool> {
private readonly SubroutineBuilder<Label> parent;
public BlockStartGatherer (SubroutineBuilder<Label> parent)
{
this.parent = parent;
}
#region IAggregateVisitor<Label,Dummy,bool> Members
public override bool Branch (Label pc, Label target, bool leavesExceptionBlock, Dummy data)
{
AddTargetLabel (target);
return true;
}
public override bool BranchCond (Label pc, Label target, BranchOperator bop, Dummy value1, Dummy value2, Dummy data)
{
AddTargetLabel (target);
return true;
}
public override bool BranchFalse (Label pc, Label target, Dummy cond, Dummy data)
{
AddTargetLabel (target);
return true;
}
public override bool BranchTrue (Label pc, Label target, Dummy cond, Dummy data)
{
AddTargetLabel (target);
return true;
}
public override bool EndFinally (Label pc, Dummy data)
{
return true;
}
public override bool Return (Label pc, Dummy source, Dummy data)
{
return true;
}
public override bool Rethrow (Label pc, Dummy data)
{
return true;
}
public override bool Throw (Label pc, Dummy exception, Dummy data)
{
return true;
}
public override bool Call<TypeList, ArgList> (Label pc, Method method, bool virt, TypeList extraVarargs, Dummy dest, ArgList args, Dummy data)
{
return CallHelper (pc, method, false, virt);
}
public override bool ConstrainedCallvirt<TypeList, ArgList> (Label pc, Method method, TypeNode constraint, TypeList extraVarargs, Dummy dest, ArgList args, Dummy data)
{
return CallHelper (pc, method, false, true);
}
public override bool NewObj<ArgList> (Label pc, Method ctor, Dummy dest, ArgList args, Dummy data)
{
return CallHelper (pc, ctor, true, false);
}
public override bool BeginOld (Label pc, Label matchingEnd, Dummy data)
{
AddTargetLabel (pc);
this.parent.BeginOldHook (pc);
return false;
}
public override bool EndOld (Label pc, Label matchingBegin, TypeNode type, Dummy dest, Dummy source, Dummy data)
{
this.parent.EndOldHook (pc);
return true;
}
public bool Aggregate (Label pc, Label aggregateStart, bool canBeTargetOfBranch, Dummy data)
{
return TraceAggregateSequentally (aggregateStart);
}
#endregion
public override bool DefaultVisit (Label pc, Dummy data)
{
return false;
}
private bool CallHelper (Label pc, Method method, bool isNewObj, bool isVirtual)
{
AddBlockStart (pc);
if (isNewObj)
this.parent.AddNewObjSite (pc, method);
else
this.parent.AddMethodCallSite (pc, new Pair<Method, bool> (method, isVirtual));
return true;
}
public bool TraceAggregateSequentally (Label current)
{
bool isCurrentBranches;
bool isCurrentHasSuccessor;
do {
ICodeProvider<Label> codeProvider = this.parent.CodeProvider;
isCurrentBranches = codeProvider.Decode<BlockStartGatherer<Label>, Dummy, bool> (current, this, Dummy.Value);
isCurrentHasSuccessor = codeProvider.Next (current, out current);
if (isCurrentBranches && isCurrentHasSuccessor)
AddBlockStart (current);
} while (isCurrentHasSuccessor);
return isCurrentBranches;
}
private void AddBlockStart (Label target)
{
this.parent.AddBlockStart (target);
}
private void AddTargetLabel (Label target)
{
this.parent.AddTargetLabel (target);
}
}
}
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