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//
// OldScanStateMachine.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.Collections.Generic;
using Mono.CodeContracts.Static.AST;
using Mono.CodeContracts.Static.AST.Visitors;
using Mono.CodeContracts.Static.ControlFlow.Blocks;
using Mono.CodeContracts.Static.DataStructures;
namespace Mono.CodeContracts.Static.ControlFlow.Subroutines {
class OldScanStateMachine<Label> : ILVisitorBase<Label, Dummy, Dummy, int, bool>,
IAggregateVisitor<Label, int, bool> {
private readonly Dictionary<CFGBlock, ScanState> block_start_state = new Dictionary<CFGBlock, ScanState> ();
private readonly EnsuresSubroutine<Label> subroutine;
private EnsuresBlock<Label> current_block;
private TypeNode next_end_old_type;
private ScanState state;
public OldScanStateMachine (EnsuresSubroutine<Label> ensuresSubroutine)
{
this.subroutine = ensuresSubroutine;
this.state = ScanState.OutsideOld;
}
#region Overrides of ILVisitorBase<Label,Local,Parameter,Method,Field,Type,Dummy,Dummy,int,bool>
public override bool DefaultVisit (Label pc, int index)
{
if (this.state != ScanState.InsertingOld)
return this.current_block.UsesOverriding;
this.state = ScanState.OutsideOld;
this.current_block.EndOldWithoutInstruction (this.subroutine.SubroutineFacade.MetaDataProvider.ManagedPointer (this.next_end_old_type));
return true;
}
#endregion
#region Implementation of ICodeQuery<Label,Local,Parameter,Method,Field,Type,int,bool>
public bool Aggregate (Label pc, Label aggregateStart, bool canBeTargetOfBranch, int data)
{
return Nop (pc, data);
}
#endregion
#region IAggregateVisitor<Label,int,bool> Members
public override bool Nop (Label pc, int data)
{
return this.current_block.UsesOverriding;
}
public override bool BeginOld (Label pc, Label matchingEnd, int data)
{
this.state = ScanState.InsideOld;
return this.current_block.UsesOverriding;
}
public override bool EndOld (Label pc, Label matchingEnd, TypeNode type, Dummy dest, Dummy source, int data)
{
this.state = ScanState.OutsideOld;
return this.current_block.UsesOverriding;
}
public override bool LoadField (Label pc, Field field, Dummy dest, Dummy obj, int data)
{
if (this.state != ScanState.InsertingOld)
return this.current_block.UsesOverriding;
this.state = ScanState.OutsideOld;
this.current_block.EndOld (data, this.subroutine.SubroutineFacade.MetaDataProvider.FieldType (field));
return false;
}
public override bool LoadFieldAddress (Label pc, Field field, Dummy dest, Dummy obj, int data)
{
if (this.state == ScanState.InsertingOld)
this.next_end_old_type = this.subroutine.SubroutineFacade.MetaDataProvider.FieldType (field);
return this.current_block.UsesOverriding;
}
public override bool Call<TypeList, ArgList> (Label pc, Method method, bool virt, TypeList extraVarargs, Dummy dest, ArgList args, int data)
{
return false;
}
#endregion
public void HandlePotentialCallBlock (MethodCallBlock<Label> block, EnsuresBlock<Label> priorBlock)
{
if (block == null || this.state != ScanState.InsertingOld)
return;
int count = this.subroutine.SubroutineFacade.MetaDataProvider.Parameters (block.CalledMethod).Count;
if (!this.subroutine.SubroutineFacade.MetaDataProvider.IsStatic (block.CalledMethod))
++count;
if (count > 1) {
this.state = ScanState.OutsideOld;
TypeNode mp = this.subroutine.SubroutineFacade.MetaDataProvider.ManagedPointer (this.next_end_old_type);
priorBlock.EndOldWithoutInstruction (mp);
} else {
this.state = ScanState.InsertingOldAfterCall;
this.next_end_old_type = this.subroutine.SubroutineFacade.MetaDataProvider.ReturnType (block.CalledMethod);
}
}
public void StartBlock (EnsuresBlock<Label> block)
{
if (!this.block_start_state.TryGetValue (block, out this.state)) {
this.state = ScanState.OutsideOld;
this.block_start_state.Add (block, this.state);
}
if (this.state == ScanState.InsertingOld)
block.StartOverridingLabels ();
if (this.state == ScanState.InsertingOldAfterCall) {
block.StartOverridingLabels ();
block.EndOldWithoutInstruction (this.next_end_old_type);
this.state = ScanState.OutsideOld;
}
this.current_block = block;
}
public void SetStartState (CFGBlock succ)
{
ScanState sstate;
if (!this.block_start_state.TryGetValue (succ, out sstate))
this.block_start_state.Add (succ, this.state);
}
#region Nested type: ScanState
private enum ScanState {
OutsideOld,
InsideOld,
InsertingOld,
InsertingOldAfterCall
}
#endregion
}
}
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