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// Copyright (c) 2010 Daniel Grunwald
//
// 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 System.Collections.ObjectModel;
using System.Diagnostics;
using System.Linq;
using ICSharpCode.NRefactory.Utils;
using Mono.Cecil;
using Mono.Cecil.Cil;
namespace ICSharpCode.Decompiler.FlowAnalysis
{
/// <summary>
/// Represents a graph of SsaBlocks.
/// </summary>
public sealed class SsaForm
{
readonly SsaVariable[] parameters;
readonly SsaVariable[] locals;
public readonly ReadOnlyCollection<SsaVariable> OriginalVariables;
public readonly ReadOnlyCollection<SsaBlock> Blocks;
readonly bool methodHasThis;
public SsaBlock EntryPoint {
get { return Blocks[0]; }
}
public SsaBlock RegularExit {
get { return Blocks[1]; }
}
public SsaBlock ExceptionalExit {
get { return Blocks[2]; }
}
internal SsaForm(SsaBlock[] blocks, SsaVariable[] parameters, SsaVariable[] locals, SsaVariable[] stackLocations, bool methodHasThis)
{
this.parameters = parameters;
this.locals = locals;
Blocks = new ReadOnlyCollection<SsaBlock>(blocks);
OriginalVariables = new ReadOnlyCollection<SsaVariable>(parameters.Concat(locals).Concat(stackLocations).ToList());
this.methodHasThis = methodHasThis;
Debug.Assert(EntryPoint.NodeType == ControlFlowNodeType.EntryPoint);
Debug.Assert(RegularExit.NodeType == ControlFlowNodeType.RegularExit);
Debug.Assert(ExceptionalExit.NodeType == ControlFlowNodeType.ExceptionalExit);
for (int i = 0; i < OriginalVariables.Count; i++) {
OriginalVariables[i].OriginalVariableIndex = i;
}
}
public GraphVizGraph ExportBlockGraph(Func<SsaBlock, string> labelProvider = null)
{
if (labelProvider == null)
labelProvider = b => b.ToString();
GraphVizGraph graph = new GraphVizGraph();
foreach (SsaBlock block in Blocks) {
graph.AddNode(new GraphVizNode(block.BlockIndex) { label = labelProvider(block), shape = "box" });
}
foreach (SsaBlock block in Blocks) {
foreach (SsaBlock s in block.Successors) {
graph.AddEdge(new GraphVizEdge(block.BlockIndex, s.BlockIndex));
}
}
return graph;
}
public GraphVizGraph ExportVariableGraph(Func<SsaVariable, string> labelProvider = null)
{
if (labelProvider == null)
labelProvider = v => v.ToString();
GraphVizGraph graph = new GraphVizGraph();
foreach (SsaVariable v in AllVariables) {
graph.AddNode(new GraphVizNode(v.Name) { label = labelProvider(v) });
}
int instructionIndex = 0;
foreach (SsaBlock block in Blocks) {
foreach (SsaInstruction inst in block.Instructions) {
if (inst.Operands.Length == 0 && inst.Target == null)
continue;
string id = "instruction" + (++instructionIndex);
graph.AddNode(new GraphVizNode(id) { label = inst.ToString(), shape = "box" });
foreach (SsaVariable op in inst.Operands)
graph.AddEdge(new GraphVizEdge(op.Name, id));
if (inst.Target != null)
graph.AddEdge(new GraphVizEdge(id, inst.Target.Name));
}
}
return graph;
}
public SsaVariable GetOriginalVariable(ParameterReference parameter)
{
if (methodHasThis)
return parameters[parameter.Index + 1];
else
return parameters[parameter.Index];
}
public SsaVariable GetOriginalVariable(VariableReference variable)
{
return locals[variable.Index];
}
#region ComputeVariableUsage
public void ComputeVariableUsage()
{
// clear data from previous runs
foreach (SsaBlock block in Blocks) {
foreach (SsaInstruction inst in block.Instructions) {
foreach (SsaVariable v in inst.Operands) {
if (v.Usage != null)
v.Usage.Clear();
}
if (inst.Target != null && inst.Target.Usage != null)
inst.Target.Usage.Clear();
}
}
foreach (SsaBlock block in Blocks) {
foreach (SsaInstruction inst in block.Instructions) {
foreach (SsaVariable v in inst.Operands) {
if (v.Usage == null)
v.Usage = new List<SsaInstruction>();
v.Usage.Add(inst);
}
if (inst.Target != null && inst.Target.Usage == null)
inst.Target.Usage = new List<SsaInstruction>();
}
}
}
#endregion
public IEnumerable<SsaVariable> AllVariables {
get {
return (
from block in Blocks
from instruction in block.Instructions
where instruction.Target != null
select instruction.Target
).Distinct();
}
}
}
}
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