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//
// SubroutineBuilder.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.ControlFlow.Blocks;
using Mono.CodeContracts.Static.DataStructures;
using Mono.CodeContracts.Static.Providers;
namespace Mono.CodeContracts.Static.ControlFlow.Subroutines.Builders {
abstract class SubroutineBuilder<Label> {
public readonly SubroutineFacade SubroutineFacade;
private readonly Dictionary<Label, Pair<Method, bool>> labels_for_call_sites = new Dictionary<Label, Pair<Method, bool>> ();
private readonly Dictionary<Label, Method> labels_for_new_obj_sites = new Dictionary<Label, Method> ();
private readonly HashSet<Label> labels_starting_blocks = new HashSet<Label> ();
private readonly HashSet<Label> target_labels = new HashSet<Label> ();
protected SubroutineBuilder (ICodeProvider<Label> codeProvider,
SubroutineFacade subroutineFacade,
Label entry)
{
this.SubroutineFacade = subroutineFacade;
CodeProvider = codeProvider;
AddTargetLabel (entry);
}
public ICodeProvider<Label> CodeProvider { get; private set; }
public abstract SubroutineBase<Label> CurrentSubroutine { get; }
public IMetaDataProvider MetaDataProvider
{
get { return this.SubroutineFacade.MetaDataProvider; }
}
protected IContractProvider ContractProvider
{
get { return this.SubroutineFacade.ContractProvider; }
}
public void AddTargetLabel (Label target)
{
AddBlockStart (target);
this.target_labels.Add (target);
}
public void AddBlockStart (Label target)
{
this.labels_starting_blocks.Add (target);
}
protected void Initialize (Label entry)
{
new BlockStartGatherer<Label> (this).TraceAggregateSequentally (entry);
}
public bool IsBlockStart (Label label)
{
return this.labels_starting_blocks.Contains (label);
}
public bool IsTargetLabel (Label label)
{
return this.target_labels.Contains (label);
}
public bool IsMethodCallSite (Label label, out Pair<Method, bool> methodVirtPair)
{
return this.labels_for_call_sites.TryGetValue (label, out methodVirtPair);
}
public bool IsNewObjSite (Label label, out Method constructor)
{
return this.labels_for_new_obj_sites.TryGetValue (label, out constructor);
}
protected BlockWithLabels<Label> BuildBlocks (Label entry)
{
return BlockBuilder<Label>.BuildBlocks (entry, this);
}
public virtual void RecordInformationSameAsOtherBlock (BlockWithLabels<Label> newBlock, BlockWithLabels<Label> currentBlock)
{
}
public virtual BlockWithLabels<Label> RecordInformationForNewBlock (Label currentLabel, BlockWithLabels<Label> previousBlock)
{
BlockWithLabels<Label> block = CurrentSubroutine.GetBlock (currentLabel);
if (previousBlock != null) {
BlockWithLabels<Label> newBlock = block;
BlockWithLabels<Label> prevBlock = previousBlock;
if (block is MethodCallBlock<Label> && previousBlock is MethodCallBlock<Label>) {
BlockWithLabels<Label> ab = CurrentSubroutine.NewBlock ();
RecordInformationSameAsOtherBlock (ab, previousBlock);
newBlock = ab;
prevBlock = ab;
CurrentSubroutine.AddSuccessor (previousBlock, EdgeTag.FallThrough, ab);
CurrentSubroutine.AddSuccessor (ab, EdgeTag.FallThrough, block);
} else
CurrentSubroutine.AddSuccessor (previousBlock, EdgeTag.FallThrough, block);
InsertPostConditionEdges (previousBlock, newBlock);
InsertPreConditionEdges (prevBlock, block);
}
return block;
}
protected void InsertPreConditionEdges (BlockWithLabels<Label> previousBlock, BlockWithLabels<Label> newBlock)
{
var methodCallBlock = newBlock as MethodCallBlock<Label>;
if (methodCallBlock == null || CurrentSubroutine.IsContract || CurrentSubroutine.IsOldValue)
return;
if (CurrentSubroutine.IsMethod) {
var methodInfo = CurrentSubroutine as IMethodInfo;
Property property;
if (methodInfo != null && MetaDataProvider.IsConstructor (methodInfo.Method)
&& MetaDataProvider.IsPropertySetter (methodCallBlock.CalledMethod, out property)
&& MetaDataProvider.IsAutoPropertyMember (methodCallBlock.CalledMethod))
return;
}
EdgeTag callTag = methodCallBlock.IsNewObj ? EdgeTag.BeforeNewObj : EdgeTag.BeforeCall;
Subroutine requires = this.SubroutineFacade.GetRequires (methodCallBlock.CalledMethod);
CurrentSubroutine.AddEdgeSubroutine (previousBlock, newBlock, requires, callTag);
}
protected void InsertPostConditionEdges (BlockWithLabels<Label> previousBlock, BlockWithLabels<Label> newBlock)
{
var methodCallBlock = previousBlock as MethodCallBlock<Label>;
if (methodCallBlock == null)
return;
if (CurrentSubroutine.IsMethod) {
var methodInfo = CurrentSubroutine as IMethodInfo;
Property property;
if (methodInfo != null && MetaDataProvider.IsConstructor (methodInfo.Method)
&& MetaDataProvider.IsPropertyGetter (methodCallBlock.CalledMethod, out property)
&& MetaDataProvider.IsAutoPropertyMember (methodCallBlock.CalledMethod))
return;
}
EdgeTag callTag = methodCallBlock.IsNewObj ? EdgeTag.AfterNewObj : EdgeTag.AfterCall;
Subroutine ensures = this.SubroutineFacade.GetEnsures (methodCallBlock.CalledMethod);
CurrentSubroutine.AddEdgeSubroutine (previousBlock, newBlock, ensures, callTag);
}
public virtual void BeginOldHook (Label label)
{
}
public virtual void EndOldHook (Label label)
{
}
public void AddMethodCallSite (Label pc, Pair<Method, bool> methodVirtPair)
{
this.labels_for_call_sites [pc] = methodVirtPair;
}
public void AddNewObjSite (Label pc, Method method)
{
this.labels_for_new_obj_sites [pc] = method;
}
}
}
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