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//
// EnsuresSubroutine.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 System;
using System.Collections.Generic;
using Mono.CodeContracts.Static.AST;
using Mono.CodeContracts.Static.ControlFlow.Blocks;
using Mono.CodeContracts.Static.ControlFlow.Subroutines.Builders;
using Mono.CodeContracts.Static.DataStructures;
namespace Mono.CodeContracts.Static.ControlFlow.Subroutines {
sealed class EnsuresSubroutine<Label> : MethodContractSubroutine<Label>, IEquatable<EnsuresSubroutine<Label>> {
private readonly Dictionary<int, Pair<CFGBlock, TypeNode>> inferred_old_label_reverse_map;
public EnsuresSubroutine (SubroutineFacade subroutineFacade,
Method method, IImmutableSet<Subroutine> inherited) : base (subroutineFacade, method)
{
this.inferred_old_label_reverse_map = new Dictionary<int, Pair<CFGBlock, TypeNode>> ();
AddSuccessor (Entry, EdgeTag.Entry, Exit);
AddBaseEnsures (Entry, Exit, inherited);
Commit ();
}
public EnsuresSubroutine (SubroutineFacade subroutineFacade,
Method method,
SimpleSubroutineBuilder<Label> builder, Label startLabel, IImmutableSet<Subroutine> inherited)
: base (subroutineFacade, method, builder, startLabel)
{
this.inferred_old_label_reverse_map = new Dictionary<int, Pair<CFGBlock, TypeNode>> ();
AddBaseEnsures (Entry, GetTargetBlock (startLabel), inherited);
}
public override SubroutineKind Kind
{
get { return SubroutineKind.Ensures; }
}
public override bool IsEnsures
{
get { return true; }
}
public override bool IsContract
{
get { return true; }
}
#region IEquatable<EnsuresSubroutine<Label>> Members
public bool Equals (EnsuresSubroutine<Label> other)
{
return Id == other.Id;
}
#endregion
private void AddBaseEnsures (CFGBlock from, CFGBlock to, IImmutableSet<Subroutine> inherited)
{
if (inherited == null)
return;
foreach (Subroutine subroutine in inherited.Elements)
AddEdgeSubroutine (from, to, subroutine, EdgeTag.Inherited);
}
public override void Initialize ()
{
if (Builder == null)
return;
Builder.BuildBlocks (this.StartLabel, this);
Commit ();
Builder = null;
}
public override BlockWithLabels<Label> NewBlock ()
{
return new EnsuresBlock<Label> (this, ref this.BlockIdGenerator);
}
public override void Commit ()
{
base.Commit ();
var visitor = new OldScanStateMachine<Label> (this);
EnsuresBlock<Label> priorBlock = null;
foreach (CFGBlock block in Blocks) {
var ensuresBlock = block as EnsuresBlock<Label>;
if (ensuresBlock != null) {
priorBlock = ensuresBlock;
int count = ensuresBlock.Count;
visitor.StartBlock (ensuresBlock);
for (int i = 0; i < count; i++) {
if (ensuresBlock.OriginalForwardDecode<int, Boolean, OldScanStateMachine<Label>> (i, visitor, i))
ensuresBlock.AddInstruction (i);
}
} else
visitor.HandlePotentialCallBlock (block as MethodCallBlock<Label>, priorBlock);
foreach (CFGBlock succ in SuccessorBlocks (block))
visitor.SetStartState (succ);
}
}
public void AddInferredOldMap (int blockIndex, int instructionIndex, CFGBlock otherBlock, TypeNode endOldType)
{
this.inferred_old_label_reverse_map.Add (OverlayInstructionKey (blockIndex, instructionIndex), new Pair<CFGBlock, TypeNode> (otherBlock, endOldType));
}
private static int OverlayInstructionKey (int blockIndex, int instructionIndex)
{
return (instructionIndex << 16) + blockIndex;
}
public CFGBlock InferredBeginEndBijection (APC pc)
{
TypeNode endOldType;
return InferredBeginEndBijection (pc, out endOldType);
}
public CFGBlock InferredBeginEndBijection (APC pc, out TypeNode endOldType)
{
Pair<CFGBlock, TypeNode> pair;
if (!this.inferred_old_label_reverse_map.TryGetValue (OverlayInstructionKey (pc.Block.Index, pc.Index), out pair))
throw new InvalidOperationException ("Fatal bug in ensures CFG begin/end old map");
endOldType = pair.Value;
return pair.Key;
}
}
}
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