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//-----------------------------------------------------------------------------
//
// Copyright (C) Microsoft Corporation. All Rights Reserved.
//
//-----------------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Cci;
using Microsoft.Cci.MetadataReader;
using Microsoft.Cci.MutableCodeModel;
using Microsoft.Cci.Contracts;
using Microsoft.Cci.ILToCodeModel;
using Bpl = Microsoft.Boogie;
namespace BytecodeTranslator
{
internal class StatementTraverser : BaseCodeTraverser {
public readonly MethodTraverser MethodTraverser;
public readonly Bpl.Variable HeapVariable;
public readonly Bpl.StmtListBuilder StmtBuilder = new Bpl.StmtListBuilder();
#region Constructors
public StatementTraverser(MethodTraverser mt) {
HeapVariable = mt.HeapVariable;
MethodTraverser = mt;
}
public StatementTraverser(MethodTraverser mt, Bpl.Variable heapvar) {
HeapVariable = heapvar;
MethodTraverser = mt;
}
#endregion
public override void Visit(IBlockStatement block) {
BasicBlock b = (BasicBlock)block;
this.Visit(b);
}
#region Basic Statements
/// <summary>
/// Visit all statements in a single block
/// </summary>
/// <param name="b"></param>
private void Visit(BasicBlock b) {
Bpl.StmtListBuilder slb = new Bpl.StmtListBuilder();
foreach (IStatement st in b.Statements) {
this.Visit(st);
}
}
/// <summary>
///
/// </summary>
/// <remarks>(mschaef) Works, but still a stub</remarks>
/// <param name="conditionalStatement"></param>
public override void Visit(IConditionalStatement conditionalStatement) {
StatementTraverser thenTraverser = new StatementTraverser(this.MethodTraverser);
StatementTraverser elseTraverser = new StatementTraverser(this.MethodTraverser);
ExpressionTraverser condTraverser = new ExpressionTraverser(this);
condTraverser.Visit(conditionalStatement.Condition);
thenTraverser.Visit(conditionalStatement.TrueBranch);
elseTraverser.Visit(conditionalStatement.FalseBranch);
Bpl.IfCmd ifcmd = new Bpl.IfCmd(TranslationHelper.CciLocationToBoogieToken(conditionalStatement.Locations),
condTraverser.TranslatedExpressions.Pop(),
thenTraverser.StmtBuilder.Collect(TranslationHelper.CciLocationToBoogieToken(conditionalStatement.TrueBranch.Locations)),
null,
elseTraverser.StmtBuilder.Collect(TranslationHelper.CciLocationToBoogieToken(conditionalStatement.FalseBranch.Locations))
);
StmtBuilder.Add(ifcmd);
}
/// <summary>
///
/// </summary>
/// <param name="expressionStatement"></param>
/// <remarks> TODO: might be wrong for the general case</remarks>
public override void Visit(IExpressionStatement expressionStatement) {
ExpressionTraverser etrav = new ExpressionTraverser(this);
etrav.Visit(expressionStatement.Expression);
}
/// <summary>
///
/// </summary>
/// <remarks>(mschaef) Not Implemented</remarks>
/// <param name="breakStatement"></param>
public override void Visit(IBreakStatement breakStatement) {
StmtBuilder.Add(new Bpl.BreakCmd(TranslationHelper.CciLocationToBoogieToken(breakStatement.Locations), "I dont know"));
}
/// <summary>
///
/// </summary>
/// <remarks>(mschaef) not implemented</remarks>
/// <param name="returnStatement"></param>
public override void Visit(IReturnStatement returnStatement) {
Bpl.IToken tok = TranslationHelper.CciLocationToBoogieToken(returnStatement.Locations);
#region Copy values of all out parameters to outvariables
foreach (MethodTraverser.MethodParameter mp in MethodTraverser.OutVars) {
StmtBuilder.Add(Bpl.Cmd.SimpleAssign(tok,
new Bpl.IdentifierExpr(tok, mp.outParameterCopy), new Bpl.IdentifierExpr(tok, mp.localParameter)));
}
#endregion
if (returnStatement.Expression != null) {
ExpressionTraverser etrav = new ExpressionTraverser(this);
etrav.Visit(returnStatement.Expression);
if (this.MethodTraverser.RetVariable == null || etrav.TranslatedExpressions.Count < 1) {
throw new TranslationException(String.Format("{0} returns a value that is not supported by the function", returnStatement.ToString()));
}
StmtBuilder.Add(Bpl.Cmd.SimpleAssign(tok,
new Bpl.IdentifierExpr(tok, this.MethodTraverser.RetVariable), etrav.TranslatedExpressions.Pop()));
}
StmtBuilder.Add(new Bpl.ReturnCmd(TranslationHelper.CciLocationToBoogieToken(returnStatement.Locations)));
}
#endregion
#region Goto and Labels
/// <summary>
///
/// </summary>
/// <remarks> STUB </remarks>
/// <param name="gotoStatement"></param>
public override void Visit(IGotoStatement gotoStatement) {
String[] target = new String[1];
target[0] = gotoStatement.TargetStatement.Label.Value;
Bpl.GotoCmd gotocmd = new Microsoft.Boogie.GotoCmd(TranslationHelper.CciLocationToBoogieToken(gotoStatement.Locations),
new Bpl.StringSeq(target));
StmtBuilder.Add(gotocmd);
}
/// <summary>
///
/// </summary>
/// <remarks> (mschaef) not sure if there is more work to do</remarks>
/// <param name="labeledStatement"></param>
public override void Visit(ILabeledStatement labeledStatement) {
StmtBuilder.AddLabelCmd(labeledStatement.Label.Value);
base.Visit(labeledStatement.Statement);
}
#endregion
#region Looping Statements
public override void Visit(IWhileDoStatement whileDoStatement) {
throw new NotImplementedException("While Statements are not implemented");
}
#endregion
}
}
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