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ILSpy/ICSharpCode.Decompiler/Ast/AstMethodBodyBuilder.cs

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using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading;
using ICSharpCode.Decompiler.Ast.Transforms;
using ICSharpCode.Decompiler.ILAst;
using ICSharpCode.NRefactory.CSharp;
using ICSharpCode.NRefactory.PatternMatching;
using ICSharpCode.NRefactory.Utils;
using Mono.Cecil;
using Mono.Cecil.Cil;
namespace ICSharpCode.Decompiler.Ast
{
using Ast = ICSharpCode.NRefactory.CSharp;
using Cecil = Mono.Cecil;
public class AstMethodBodyBuilder
{
MethodDefinition methodDef;
TypeSystem typeSystem;
DecompilerContext context;
HashSet<ILVariable> localVariablesToDefine = new HashSet<ILVariable>(); // local variables that are missing a definition
/// <summary>
/// Creates the body for the method definition.
/// </summary>
/// <param name="methodDef">Method definition to decompile.</param>
/// <param name="context">Decompilation context.</param>
/// <param name="parameters">Parameter declarations of the method being decompiled.
/// These are used to update the parameter names when the decompiler generates names for the parameters.</param>
/// <param name="localVariables">Local variables storage that will be filled/updated with the local variables.</param>
/// <returns>Block for the method body</returns>
public static BlockStatement CreateMethodBody(MethodDefinition methodDef,
DecompilerContext context,
IEnumerable<ParameterDeclaration> parameters = null,
ConcurrentDictionary<int, IEnumerable<ILVariable>> localVariables = null)
{
if (localVariables == null)
localVariables = new ConcurrentDictionary<int, IEnumerable<ILVariable>>();
MethodDefinition oldCurrentMethod = context.CurrentMethod;
Debug.Assert(oldCurrentMethod == null || oldCurrentMethod == methodDef);
context.CurrentMethod = methodDef;
try {
AstMethodBodyBuilder builder = new AstMethodBodyBuilder();
builder.methodDef = methodDef;
builder.context = context;
builder.typeSystem = methodDef.Module.TypeSystem;
if (Debugger.IsAttached) {
return builder.CreateMethodBody(parameters, localVariables);
} else {
try {
return builder.CreateMethodBody(parameters, localVariables);
} catch (OperationCanceledException) {
throw;
} catch (Exception ex) {
throw new ICSharpCode.Decompiler.DecompilerException(methodDef, ex);
}
}
} finally {
context.CurrentMethod = oldCurrentMethod;
}
}
public BlockStatement CreateMethodBody(IEnumerable<ParameterDeclaration> parameters,
ConcurrentDictionary<int, IEnumerable<ILVariable>> localVariables)
{
if (methodDef.Body == null) return null;
if (localVariables == null)
throw new ArgumentException("localVariables must be instantiated");
context.CancellationToken.ThrowIfCancellationRequested();
ILBlock ilMethod = new ILBlock();
ILAstBuilder astBuilder = new ILAstBuilder();
ilMethod.Body = astBuilder.Build(methodDef, true);
context.CancellationToken.ThrowIfCancellationRequested();
ILAstOptimizer bodyGraph = new ILAstOptimizer();
bodyGraph.Optimize(context, ilMethod);
context.CancellationToken.ThrowIfCancellationRequested();
var allVariables = ilMethod.GetSelfAndChildrenRecursive<ILExpression>().Select(e => e.Operand as ILVariable)
.Where(v => v != null && !v.IsParameter).Distinct();
Debug.Assert(context.CurrentMethod == methodDef);
NameVariables.AssignNamesToVariables(context, astBuilder.Parameters, allVariables, ilMethod);
if (parameters != null) {
foreach (var pair in (from p in parameters
join v in astBuilder.Parameters on p.Annotation<ParameterDefinition>() equals v.OriginalParameter
select new { p, v.Name }))
{
pair.p.Name = pair.Name;
}
}
context.CancellationToken.ThrowIfCancellationRequested();
Ast.BlockStatement astBlock = TransformBlock(ilMethod);
CommentStatement.ReplaceAll(astBlock); // convert CommentStatements to Comments
Statement insertionPoint = astBlock.Statements.FirstOrDefault();
foreach (ILVariable v in localVariablesToDefine) {
AstType type;
if (v.Type.ContainsAnonymousType())
type = new SimpleType("var");
else
type = AstBuilder.ConvertType(v.Type);
var newVarDecl = new VariableDeclarationStatement(type, v.Name);
astBlock.Statements.InsertBefore(insertionPoint, newVarDecl);
}
// store the variables - used for debugger
int token = methodDef.MetadataToken.ToInt32();
localVariables.AddOrUpdate(token, allVariables, (key, oldValue) => allVariables);
return astBlock;
}
Ast.BlockStatement TransformBlock(ILBlock block)
{
Ast.BlockStatement astBlock = new BlockStatement();
if (block != null) {
foreach(ILNode node in block.GetChildren()) {
astBlock.AddRange(TransformNode(node));
}
}
return astBlock;
}
IEnumerable<Statement> TransformNode(ILNode node)
{
if (node is ILLabel) {
yield return new Ast.LabelStatement { Label = ((ILLabel)node).Name };
} else if (node is ILExpression) {
List<ILRange> ilRanges = ILRange.OrderAndJoint(node.GetSelfAndChildrenRecursive<ILExpression>().SelectMany(e => e.ILRanges));
AstNode codeExpr = TransformExpression((ILExpression)node);
if (codeExpr != null) {
codeExpr = codeExpr.WithAnnotation(ilRanges);
if (codeExpr is Ast.Expression) {
yield return new Ast.ExpressionStatement { Expression = (Ast.Expression)codeExpr };
} else if (codeExpr is Ast.Statement) {
yield return (Ast.Statement)codeExpr;
} else {
throw new Exception();
}
}
} else if (node is ILWhileLoop) {
ILWhileLoop ilLoop = (ILWhileLoop)node;
WhileStatement whileStmt = new WhileStatement() {
Condition = ilLoop.Condition != null ? (Expression)TransformExpression(ilLoop.Condition) : new PrimitiveExpression(true),
EmbeddedStatement = TransformBlock(ilLoop.BodyBlock)
};
yield return whileStmt;
} else if (node is ILCondition) {
ILCondition conditionalNode = (ILCondition)node;
bool hasFalseBlock = conditionalNode.FalseBlock.EntryGoto != null || conditionalNode.FalseBlock.Body.Count > 0;
yield return new Ast.IfElseStatement {
Condition = (Expression)TransformExpression(conditionalNode.Condition),
TrueStatement = TransformBlock(conditionalNode.TrueBlock),
FalseStatement = hasFalseBlock ? TransformBlock(conditionalNode.FalseBlock) : null
};
} else if (node is ILSwitch) {
ILSwitch ilSwitch = (ILSwitch)node;
SwitchStatement switchStmt = new SwitchStatement() { Expression = (Expression)TransformExpression(ilSwitch.Condition) };
foreach (var caseBlock in ilSwitch.CaseBlocks) {
SwitchSection section = new SwitchSection();
if (caseBlock.Values != null) {
section.CaseLabels.AddRange(caseBlock.Values.Select(i => new CaseLabel() { Expression = AstBuilder.MakePrimitive(i, ilSwitch.Condition.InferredType) }));
} else {
section.CaseLabels.Add(new CaseLabel());
}
section.Statements.Add(TransformBlock(caseBlock));
switchStmt.SwitchSections.Add(section);
}
yield return switchStmt;
} else if (node is ILTryCatchBlock) {
ILTryCatchBlock tryCatchNode = ((ILTryCatchBlock)node);
var tryCatchStmt = new Ast.TryCatchStatement();
tryCatchStmt.TryBlock = TransformBlock(tryCatchNode.TryBlock);
foreach (var catchClause in tryCatchNode.CatchBlocks) {
if (catchClause.ExceptionVariable == null
&& (catchClause.ExceptionType == null || catchClause.ExceptionType.MetadataType == MetadataType.Object))
{
tryCatchStmt.CatchClauses.Add(new Ast.CatchClause { Body = TransformBlock(catchClause) });
} else {
tryCatchStmt.CatchClauses.Add(
new Ast.CatchClause {
Type = AstBuilder.ConvertType(catchClause.ExceptionType),
VariableName = catchClause.ExceptionVariable == null ? null : catchClause.ExceptionVariable.Name,
Body = TransformBlock(catchClause)
});
}
}
if (tryCatchNode.FinallyBlock != null)
tryCatchStmt.FinallyBlock = TransformBlock(tryCatchNode.FinallyBlock);
if (tryCatchNode.FaultBlock != null) {
CatchClause cc = new CatchClause();
cc.Body = TransformBlock(tryCatchNode.FaultBlock);
cc.Body.Add(new ThrowStatement()); // rethrow
tryCatchStmt.CatchClauses.Add(cc);
}
yield return tryCatchStmt;
} else if (node is ILFixedStatement) {
ILFixedStatement fixedNode = (ILFixedStatement)node;
FixedStatement fixedStatement = new FixedStatement();
foreach (ILExpression initializer in fixedNode.Initializers) {
Debug.Assert(initializer.Code == ILCode.Stloc);
ILVariable v = (ILVariable)initializer.Operand;
fixedStatement.Variables.Add(
new VariableInitializer {
Name = v.Name,
Initializer = (Expression)TransformExpression(initializer.Arguments[0])
}.WithAnnotation(v));
}
fixedStatement.Type = AstBuilder.ConvertType(((ILVariable)fixedNode.Initializers[0].Operand).Type);
fixedStatement.EmbeddedStatement = TransformBlock(fixedNode.BodyBlock);
yield return fixedStatement;
} else if (node is ILBlock) {
yield return TransformBlock((ILBlock)node);
} else {
throw new Exception("Unknown node type");
}
}
AstNode TransformExpression(ILExpression expr)
{
AstNode node = TransformByteCode(expr);
Expression astExpr = node as Expression;
// get IL ranges - used in debugger
List<ILRange> ilRanges = ILRange.OrderAndJoint(expr.GetSelfAndChildrenRecursive<ILExpression>().SelectMany(e => e.ILRanges));
AstNode result;
if (astExpr != null)
result = Convert(astExpr, expr.InferredType, expr.ExpectedType);
else
result = node;
if (result != null)
return result.WithAnnotation(ilRanges);
return result;
}
AstNode TransformByteCode(ILExpression byteCode)
{
object operand = byteCode.Operand;
AstType operandAsTypeRef = AstBuilder.ConvertType(operand as Cecil.TypeReference);
List<Ast.Expression> args = new List<Expression>();
foreach(ILExpression arg in byteCode.Arguments) {
args.Add((Ast.Expression)TransformExpression(arg));
}
Ast.Expression arg1 = args.Count >= 1 ? args[0] : null;
Ast.Expression arg2 = args.Count >= 2 ? args[1] : null;
Ast.Expression arg3 = args.Count >= 3 ? args[2] : null;
switch (byteCode.Code) {
#region Arithmetic
case ILCode.Add:
case ILCode.Add_Ovf:
case ILCode.Add_Ovf_Un:
{
BinaryOperatorExpression boe;
if (byteCode.InferredType is PointerType) {
if (byteCode.Arguments[0].ExpectedType is PointerType) {
arg2 = DivideBySize(arg2, ((PointerType)byteCode.InferredType).ElementType);
boe = new Ast.BinaryOperatorExpression(arg1, BinaryOperatorType.Add, arg2);
boe.AddAnnotation(IntroduceUnsafeModifier.PointerArithmeticAnnotation);
} else if (byteCode.Arguments[1].ExpectedType is PointerType) {
arg1 = DivideBySize(arg1, ((PointerType)byteCode.InferredType).ElementType);
boe = new Ast.BinaryOperatorExpression(arg1, BinaryOperatorType.Add, arg2);
boe.AddAnnotation(IntroduceUnsafeModifier.PointerArithmeticAnnotation);
} else {
boe = new Ast.BinaryOperatorExpression(arg1, BinaryOperatorType.Add, arg2);
}
} else {
boe = new Ast.BinaryOperatorExpression(arg1, BinaryOperatorType.Add, arg2);
}
boe.AddAnnotation(byteCode.Code == ILCode.Add ? AddCheckedBlocks.UncheckedAnnotation : AddCheckedBlocks.CheckedAnnotation);
return boe;
}
case ILCode.Sub:
case ILCode.Sub_Ovf:
case ILCode.Sub_Ovf_Un:
{
BinaryOperatorExpression boe;
if (byteCode.InferredType is PointerType) {
if (byteCode.Arguments[0].ExpectedType is PointerType) {
arg2 = DivideBySize(arg2, ((PointerType)byteCode.InferredType).ElementType);
boe = new Ast.BinaryOperatorExpression(arg1, BinaryOperatorType.Subtract, arg2);
boe.WithAnnotation(IntroduceUnsafeModifier.PointerArithmeticAnnotation);
} else {
boe = new Ast.BinaryOperatorExpression(arg1, BinaryOperatorType.Subtract, arg2);
}
} else {
boe = new Ast.BinaryOperatorExpression(arg1, BinaryOperatorType.Subtract, arg2);
}
boe.AddAnnotation(byteCode.Code == ILCode.Sub ? AddCheckedBlocks.UncheckedAnnotation : AddCheckedBlocks.CheckedAnnotation);
return boe;
}
case ILCode.Div: return new Ast.BinaryOperatorExpression(arg1, BinaryOperatorType.Divide, arg2);
case ILCode.Div_Un: return new Ast.BinaryOperatorExpression(arg1, BinaryOperatorType.Divide, arg2);
case ILCode.Mul: return new Ast.BinaryOperatorExpression(arg1, BinaryOperatorType.Multiply, arg2).WithAnnotation(AddCheckedBlocks.UncheckedAnnotation);
case ILCode.Mul_Ovf: return new Ast.BinaryOperatorExpression(arg1, BinaryOperatorType.Multiply, arg2).WithAnnotation(AddCheckedBlocks.CheckedAnnotation);
case ILCode.Mul_Ovf_Un: return new Ast.BinaryOperatorExpression(arg1, BinaryOperatorType.Multiply, arg2).WithAnnotation(AddCheckedBlocks.CheckedAnnotation);
case ILCode.Rem: return new Ast.BinaryOperatorExpression(arg1, BinaryOperatorType.Modulus, arg2);
case ILCode.Rem_Un: return new Ast.BinaryOperatorExpression(arg1, BinaryOperatorType.Modulus, arg2);
case ILCode.And: return new Ast.BinaryOperatorExpression(arg1, BinaryOperatorType.BitwiseAnd, arg2);
case ILCode.Or: return new Ast.BinaryOperatorExpression(arg1, BinaryOperatorType.BitwiseOr, arg2);
case ILCode.Xor: return new Ast.BinaryOperatorExpression(arg1, BinaryOperatorType.ExclusiveOr, arg2);
case ILCode.Shl: return new Ast.BinaryOperatorExpression(arg1, BinaryOperatorType.ShiftLeft, arg2);
case ILCode.Shr: return new Ast.BinaryOperatorExpression(arg1, BinaryOperatorType.ShiftRight, arg2);
case ILCode.Shr_Un: return new Ast.BinaryOperatorExpression(arg1, BinaryOperatorType.ShiftRight, arg2);
case ILCode.Neg: return new Ast.UnaryOperatorExpression(UnaryOperatorType.Minus, arg1).WithAnnotation(AddCheckedBlocks.UncheckedAnnotation);
case ILCode.Not: return new Ast.UnaryOperatorExpression(UnaryOperatorType.BitNot, arg1);
case ILCode.PostIncrement:
case ILCode.PostIncrement_Ovf:
case ILCode.PostIncrement_Ovf_Un:
{
if (arg1 is DirectionExpression)
arg1 = ((DirectionExpression)arg1).Expression.Detach();
var uoe = new Ast.UnaryOperatorExpression(
(int)byteCode.Operand > 0 ? UnaryOperatorType.PostIncrement : UnaryOperatorType.PostDecrement, arg1);
uoe.AddAnnotation((byteCode.Code == ILCode.PostIncrement) ? AddCheckedBlocks.UncheckedAnnotation : AddCheckedBlocks.CheckedAnnotation);
return uoe;
}
#endregion
#region Arrays
case ILCode.Newarr:
case ILCode.InitArray: {
var ace = new Ast.ArrayCreateExpression();
ace.Type = operandAsTypeRef;
ComposedType ct = operandAsTypeRef as ComposedType;
if (ct != null) {
// change "new (int[,])[10] to new int[10][,]"
ct.ArraySpecifiers.MoveTo(ace.AdditionalArraySpecifiers);
}
if (byteCode.Code == ILCode.InitArray) {
ace.Initializer = new ArrayInitializerExpression();
ace.Initializer.Elements.AddRange(args);
} else {
ace.Arguments.Add(arg1);
}
return ace;
}
case ILCode.Ldlen: return arg1.Member("Length");
case ILCode.Ldelem_I:
case ILCode.Ldelem_I1:
case ILCode.Ldelem_I2:
case ILCode.Ldelem_I4:
case ILCode.Ldelem_I8:
case ILCode.Ldelem_U1:
case ILCode.Ldelem_U2:
case ILCode.Ldelem_U4:
case ILCode.Ldelem_R4:
case ILCode.Ldelem_R8:
case ILCode.Ldelem_Ref:
case ILCode.Ldelem_Any:
return arg1.Indexer(arg2);
case ILCode.Ldelema:
return MakeRef(arg1.Indexer(arg2));
case ILCode.Stelem_I:
case ILCode.Stelem_I1:
case ILCode.Stelem_I2:
case ILCode.Stelem_I4:
case ILCode.Stelem_I8:
case ILCode.Stelem_R4:
case ILCode.Stelem_R8:
case ILCode.Stelem_Ref:
case ILCode.Stelem_Any:
return new Ast.AssignmentExpression(arg1.Indexer(arg2), arg3);
case ILCode.CompoundAssignment:
{
CastExpression cast = arg1 as CastExpression;
BinaryOperatorExpression boe = (BinaryOperatorExpression)(cast != null ? cast.Expression : arg1);
var assignment = new Ast.AssignmentExpression {
Left = boe.Left.Detach(),
Operator = ReplaceMethodCallsWithOperators.GetAssignmentOperatorForBinaryOperator(boe.Operator),
Right = boe.Right.Detach()
}.CopyAnnotationsFrom(boe);
// We do not mark the resulting assignment as RestoreOriginalAssignOperatorAnnotation, because
// the operator cannot be translated back to the expanded form (as the left-hand expression
// would be evaluated twice, and might have side-effects)
if (cast != null) {
cast.Expression = assignment;
return cast;
} else {
return assignment;
}
}
#endregion
#region Comparison
case ILCode.Ceq: return new Ast.BinaryOperatorExpression(arg1, BinaryOperatorType.Equality, arg2);
case ILCode.Cgt: return new Ast.BinaryOperatorExpression(arg1, BinaryOperatorType.GreaterThan, arg2);
case ILCode.Cgt_Un: {
// can also mean Inequality, when used with object references
TypeReference arg1Type = byteCode.Arguments[0].InferredType;
if (arg1Type != null && !arg1Type.IsValueType)
return new Ast.BinaryOperatorExpression(arg1, BinaryOperatorType.InEquality, arg2);
else
return new Ast.BinaryOperatorExpression(arg1, BinaryOperatorType.GreaterThan, arg2);
}
case ILCode.Clt: return new Ast.BinaryOperatorExpression(arg1, BinaryOperatorType.LessThan, arg2);
case ILCode.Clt_Un: return new Ast.BinaryOperatorExpression(arg1, BinaryOperatorType.LessThan, arg2);
#endregion
#region Logical
case ILCode.LogicNot: return new Ast.UnaryOperatorExpression(UnaryOperatorType.Not, arg1);
case ILCode.LogicAnd: return new Ast.BinaryOperatorExpression(arg1, BinaryOperatorType.ConditionalAnd, arg2);
case ILCode.LogicOr: return new Ast.BinaryOperatorExpression(arg1, BinaryOperatorType.ConditionalOr, arg2);
case ILCode.TernaryOp: return new Ast.ConditionalExpression() { Condition = arg1, TrueExpression = arg2, FalseExpression = arg3 };
case ILCode.NullCoalescing: return new Ast.BinaryOperatorExpression(arg1, BinaryOperatorType.NullCoalescing, arg2);
#endregion
#region Branch
case ILCode.Br: return new Ast.GotoStatement(((ILLabel)byteCode.Operand).Name);
case ILCode.Brtrue:
return new Ast.IfElseStatement() {
Condition = arg1,
TrueStatement = new BlockStatement() {
new Ast.GotoStatement(((ILLabel)byteCode.Operand).Name)
}
};
case ILCode.LoopOrSwitchBreak: return new Ast.BreakStatement();
case ILCode.LoopContinue: return new Ast.ContinueStatement();
#endregion
#region Conversions
case ILCode.Conv_I1:
case ILCode.Conv_I2:
case ILCode.Conv_I4:
case ILCode.Conv_I8:
case ILCode.Conv_U1:
case ILCode.Conv_U2:
case ILCode.Conv_U4:
case ILCode.Conv_U8:
case ILCode.Conv_I:
case ILCode.Conv_U:
{
// conversion was handled by Convert() function using the info from type analysis
CastExpression cast = arg1 as CastExpression;
if (cast != null) {
cast.AddAnnotation(AddCheckedBlocks.UncheckedAnnotation);
}
return arg1;
}
case ILCode.Conv_R4:
case ILCode.Conv_R8:
case ILCode.Conv_R_Un: // TODO
return arg1;
case ILCode.Conv_Ovf_I1:
case ILCode.Conv_Ovf_I2:
case ILCode.Conv_Ovf_I4:
case ILCode.Conv_Ovf_I8:
case ILCode.Conv_Ovf_U1:
case ILCode.Conv_Ovf_U2:
case ILCode.Conv_Ovf_U4:
case ILCode.Conv_Ovf_U8:
case ILCode.Conv_Ovf_I1_Un:
case ILCode.Conv_Ovf_I2_Un:
case ILCode.Conv_Ovf_I4_Un:
case ILCode.Conv_Ovf_I8_Un:
case ILCode.Conv_Ovf_U1_Un:
case ILCode.Conv_Ovf_U2_Un:
case ILCode.Conv_Ovf_U4_Un:
case ILCode.Conv_Ovf_U8_Un:
{
// conversion was handled by Convert() function using the info from type analysis
CastExpression cast = arg1 as CastExpression;
if (cast != null) {
cast.AddAnnotation(AddCheckedBlocks.CheckedAnnotation);
}
return arg1;
}
case ILCode.Conv_Ovf_I: return arg1.CastTo(typeof(IntPtr)); // TODO
case ILCode.Conv_Ovf_U: return arg1.CastTo(typeof(UIntPtr));
case ILCode.Conv_Ovf_I_Un: return arg1.CastTo(typeof(IntPtr));
case ILCode.Conv_Ovf_U_Un: return arg1.CastTo(typeof(UIntPtr));
case ILCode.Castclass: return arg1.CastTo(operandAsTypeRef);
case ILCode.Unbox_Any:
// unboxing does not require a cast if the argument was an isinst instruction
if (arg1 is AsExpression && byteCode.Arguments[0].Code == ILCode.Isinst && TypeAnalysis.IsSameType(operand as TypeReference, byteCode.Arguments[0].Operand as TypeReference))
return arg1;
else
return arg1.CastTo(operandAsTypeRef);
case ILCode.Isinst:
return arg1.CastAs(operandAsTypeRef);
case ILCode.Box:
return arg1;
case ILCode.Unbox:
return MakeRef(arg1.CastTo(operandAsTypeRef));
#endregion
#region Indirect
case ILCode.Ldind_Ref:
case ILCode.Ldobj:
if (arg1 is DirectionExpression)
return ((DirectionExpression)arg1).Expression.Detach();
else
return new UnaryOperatorExpression(UnaryOperatorType.Dereference, arg1);
case ILCode.Stind_Ref:
case ILCode.Stobj:
if (arg1 is DirectionExpression)
return new AssignmentExpression(((DirectionExpression)arg1).Expression.Detach(), arg2);
else
return new AssignmentExpression(new UnaryOperatorExpression(UnaryOperatorType.Dereference, arg1), arg2);
#endregion
case ILCode.Arglist:
return new UndocumentedExpression { UndocumentedExpressionType = UndocumentedExpressionType.ArgListAccess };
case ILCode.Break: return InlineAssembly(byteCode, args);
case ILCode.Call:
case ILCode.CallGetter:
case ILCode.CallSetter:
return TransformCall(false, byteCode, args);
case ILCode.Callvirt:
case ILCode.CallvirtGetter:
case ILCode.CallvirtSetter:
return TransformCall(true, byteCode, args);
case ILCode.Ldftn: {
Cecil.MethodReference cecilMethod = ((MethodReference)operand);
var expr = new Ast.IdentifierExpression(cecilMethod.Name);
expr.TypeArguments.AddRange(ConvertTypeArguments(cecilMethod));
expr.AddAnnotation(cecilMethod);
return new IdentifierExpression("ldftn").Invoke(expr)
.WithAnnotation(new Transforms.DelegateConstruction.Annotation(false));
}
case ILCode.Ldvirtftn: {
Cecil.MethodReference cecilMethod = ((MethodReference)operand);
var expr = new Ast.IdentifierExpression(cecilMethod.Name);
expr.TypeArguments.AddRange(ConvertTypeArguments(cecilMethod));
expr.AddAnnotation(cecilMethod);
return new IdentifierExpression("ldvirtftn").Invoke(expr)
.WithAnnotation(new Transforms.DelegateConstruction.Annotation(true));
}
case ILCode.Calli: return InlineAssembly(byteCode, args);
case ILCode.Ckfinite: return InlineAssembly(byteCode, args);
case ILCode.Constrained: return InlineAssembly(byteCode, args);
case ILCode.Cpblk: return InlineAssembly(byteCode, args);
case ILCode.Cpobj: return InlineAssembly(byteCode, args);
case ILCode.Dup: return arg1;
case ILCode.Endfilter: return InlineAssembly(byteCode, args);
case ILCode.Endfinally: return null;
case ILCode.Initblk: return InlineAssembly(byteCode, args);
case ILCode.Initobj: return InlineAssembly(byteCode, args);
case ILCode.DefaultValue:
return MakeDefaultValue((TypeReference)operand);
case ILCode.Jmp: return InlineAssembly(byteCode, args);
case ILCode.Ldc_I4:
return AstBuilder.MakePrimitive((int)operand, byteCode.InferredType);
case ILCode.Ldc_I8:
return AstBuilder.MakePrimitive((long)operand, byteCode.InferredType);
case ILCode.Ldc_R4:
case ILCode.Ldc_R8:
case ILCode.Ldc_Decimal:
return new Ast.PrimitiveExpression(operand);
case ILCode.Ldfld:
if (arg1 is DirectionExpression)
arg1 = ((DirectionExpression)arg1).Expression.Detach();
return arg1.Member(((FieldReference) operand).Name).WithAnnotation(operand);
case ILCode.Ldsfld:
return AstBuilder.ConvertType(((FieldReference)operand).DeclaringType)
.Member(((FieldReference)operand).Name).WithAnnotation(operand);
case ILCode.Stfld:
if (arg1 is DirectionExpression)
arg1 = ((DirectionExpression)arg1).Expression.Detach();
return new AssignmentExpression(arg1.Member(((FieldReference) operand).Name).WithAnnotation(operand), arg2);
case ILCode.Stsfld:
return new AssignmentExpression(
AstBuilder.ConvertType(((FieldReference)operand).DeclaringType)
.Member(((FieldReference)operand).Name).WithAnnotation(operand),
arg1);
case ILCode.Ldflda:
if (arg1 is DirectionExpression)
arg1 = ((DirectionExpression)arg1).Expression.Detach();
return MakeRef(arg1.Member(((FieldReference) operand).Name).WithAnnotation(operand));
case ILCode.Ldsflda:
return MakeRef(
AstBuilder.ConvertType(((FieldReference)operand).DeclaringType)
.Member(((FieldReference)operand).Name).WithAnnotation(operand));
case ILCode.Ldloc: {
ILVariable v = (ILVariable)operand;
if (!v.IsParameter)
localVariablesToDefine.Add((ILVariable)operand);
Expression expr;
if (v.IsParameter && v.OriginalParameter.Index < 0)
expr = new ThisReferenceExpression();
else
expr = new Ast.IdentifierExpression(((ILVariable)operand).Name).WithAnnotation(operand);
return v.IsParameter && v.Type is ByReferenceType ? MakeRef(expr) : expr;
}
case ILCode.Ldloca: {
ILVariable v = (ILVariable)operand;
if (v.IsParameter && v.OriginalParameter.Index < 0)
return MakeRef(new ThisReferenceExpression());
if (!v.IsParameter)
localVariablesToDefine.Add((ILVariable)operand);
return MakeRef(new Ast.IdentifierExpression(((ILVariable)operand).Name).WithAnnotation(operand));
}
case ILCode.Ldnull: return new Ast.NullReferenceExpression();
case ILCode.Ldstr: return new Ast.PrimitiveExpression(operand);
case ILCode.Ldtoken:
if (operand is Cecil.TypeReference) {
return new Ast.TypeOfExpression { Type = AddEmptyTypeArgumentsForUnboundGenerics(operandAsTypeRef) }.Member("TypeHandle");
} else {
return InlineAssembly(byteCode, args);
}
case ILCode.Leave: return new GotoStatement() { Label = ((ILLabel)operand).Name };
case ILCode.Localloc:
{
PointerType ptrType = byteCode.InferredType as PointerType;
TypeReference type;
if (ptrType != null) {
type = ptrType.ElementType;
} else {
type = typeSystem.Byte;
}
return new StackAllocExpression {
Type = AstBuilder.ConvertType(type),
CountExpression = DivideBySize(arg1, type)
};
}
case ILCode.Mkrefany:
{
DirectionExpression dir = arg1 as DirectionExpression;
if (dir != null) {
return new UndocumentedExpression {
UndocumentedExpressionType = UndocumentedExpressionType.MakeRef,
Arguments = { dir.Expression.Detach() }
};
} else {
return InlineAssembly(byteCode, args);
}
}
case ILCode.Refanytype:
return new UndocumentedExpression {
UndocumentedExpressionType = UndocumentedExpressionType.RefType,
Arguments = { arg1 }
}.Member("TypeHandle");
case ILCode.Refanyval:
return MakeRef(
new UndocumentedExpression {
UndocumentedExpressionType = UndocumentedExpressionType.RefValue,
Arguments = { arg1, new TypeReferenceExpression(operandAsTypeRef) }
});
case ILCode.Newobj: {
Cecil.TypeReference declaringType = ((MethodReference)operand).DeclaringType;
if (declaringType is ArrayType) {
ComposedType ct = AstBuilder.ConvertType((ArrayType)declaringType) as ComposedType;
if (ct != null && ct.ArraySpecifiers.Count >= 1) {
var ace = new Ast.ArrayCreateExpression();
ct.ArraySpecifiers.First().Remove();
ct.ArraySpecifiers.MoveTo(ace.AdditionalArraySpecifiers);
ace.Type = ct;
ace.Arguments.AddRange(args);
return ace;
}
}
var oce = new Ast.ObjectCreateExpression();
if (declaringType.IsAnonymousType()) {
MethodDefinition ctor = ((MethodReference)operand).Resolve();
if (methodDef != null) {
oce.Initializer = new ArrayInitializerExpression();
for (int i = 0; i < args.Count; i++) {
oce.Initializer.Elements.Add(
new NamedArgumentExpression {
Identifier = ctor.Parameters[i].Name,
Expression = args[i]
});
}
}
return oce;
}
oce.Type = AstBuilder.ConvertType(declaringType);
oce.Arguments.AddRange(args);
return oce.WithAnnotation(operand);
}
case ILCode.No: return InlineAssembly(byteCode, args);
case ILCode.Nop: return null;
case ILCode.Pop: return arg1;
case ILCode.Readonly: return InlineAssembly(byteCode, args);
case ILCode.Ret:
if (methodDef.ReturnType.FullName != "System.Void") {
return new Ast.ReturnStatement { Expression = arg1 };
} else {
return new Ast.ReturnStatement();
}
case ILCode.Rethrow: return new Ast.ThrowStatement();
case ILCode.Sizeof: return new Ast.SizeOfExpression { Type = operandAsTypeRef };
case ILCode.Stloc: {
ILVariable locVar = (ILVariable)operand;
if (!locVar.IsParameter)
localVariablesToDefine.Add(locVar);
return new Ast.AssignmentExpression(new Ast.IdentifierExpression(locVar.Name).WithAnnotation(locVar), arg1);
}
case ILCode.Switch: return InlineAssembly(byteCode, args);
case ILCode.Tail: return InlineAssembly(byteCode, args);
case ILCode.Throw: return new Ast.ThrowStatement { Expression = arg1 };
case ILCode.Unaligned: return InlineAssembly(byteCode, args);
case ILCode.Volatile: return InlineAssembly(byteCode, args);
case ILCode.YieldBreak:
return new Ast.YieldBreakStatement();
case ILCode.YieldReturn:
return new Ast.YieldStatement { Expression = arg1 };
case ILCode.InitObject:
case ILCode.InitCollection:
{
ArrayInitializerExpression initializer = new ArrayInitializerExpression();
for (int i = 1; i < args.Count; i++) {
Match m = objectInitializerPattern.Match(args[i]);
if (m.Success) {
MemberReferenceExpression mre = m.Get<MemberReferenceExpression>("left").Single();
initializer.Elements.Add(
new NamedArgumentExpression {
Identifier = mre.MemberName,
Expression = m.Get<Expression>("right").Single().Detach()
}.CopyAnnotationsFrom(mre));
} else {
m = collectionInitializerPattern.Match(args[i]);
if (m.Success) {
if (m.Get("arg").Count() == 1) {
initializer.Elements.Add(m.Get<Expression>("arg").Single().Detach());
} else {
ArrayInitializerExpression argList = new ArrayInitializerExpression();
foreach (var expr in m.Get<Expression>("arg")) {
argList.Elements.Add(expr.Detach());
}
initializer.Elements.Add(argList);
}
} else {
initializer.Elements.Add(args[i]);
}
}
}
ObjectCreateExpression oce = arg1 as ObjectCreateExpression;
if (oce != null) {
oce.Initializer = initializer;
return oce;
} else {
return new AssignmentExpression(arg1, initializer);
}
}
case ILCode.InitializedObject:
return new InitializedObjectExpression();
case ILCode.AddressOf:
return MakeRef(arg1);
default:
throw new Exception("Unknown OpCode: " + byteCode.Code);
}
}
AstType AddEmptyTypeArgumentsForUnboundGenerics(AstType type)
{
TypeReference typeRef = type.Annotation<TypeReference>();
if (typeRef == null)
return type;
TypeDefinition typeDef = typeRef.Resolve(); // need to resolve to figure out the number of type parameters
if (typeDef == null || !typeDef.HasGenericParameters)
return type;
SimpleType sType = type as SimpleType;
MemberType mType = type as MemberType;
if (sType != null) {
while (typeDef.GenericParameters.Count > sType.TypeArguments.Count) {
sType.TypeArguments.Add(new SimpleType(""));
}
}
if (mType != null) {
AddEmptyTypeArgumentsForUnboundGenerics(mType.Target);
int outerTypeParamCount = typeDef.DeclaringType == null ? 0 : typeDef.DeclaringType.GenericParameters.Count;
while (typeDef.GenericParameters.Count - outerTypeParamCount > mType.TypeArguments.Count) {
mType.TypeArguments.Add(new SimpleType(""));
}
}
return type;
}
static readonly AstNode objectInitializerPattern = new AssignmentExpression(
new MemberReferenceExpression {
Target = new InitializedObjectExpression()
}.WithName("left"),
new AnyNode("right")
);
static readonly AstNode collectionInitializerPattern = new InvocationExpression {
Target = new MemberReferenceExpression {
Target = new InitializedObjectExpression(),
MemberName = "Add"
},
Arguments = { new Repeat(new AnyNode("arg")) }
};
sealed class InitializedObjectExpression : IdentifierExpression
{
public InitializedObjectExpression() : base("__initialized_object__") {}
protected override bool DoMatch(AstNode other, Match match)
{
return other is InitializedObjectExpression;
}
}
/// <summary>
/// Divides expr by the size of 'type'.
/// </summary>
Expression DivideBySize(Expression expr, TypeReference type)
{
CastExpression cast = expr as CastExpression;
if (cast != null && cast.Type is PrimitiveType && ((PrimitiveType)cast.Type).Keyword == "int")
expr = cast.Expression.Detach();
Expression sizeOfExpression;
switch (TypeAnalysis.GetInformationAmount(type)) {
case 1:
case 8:
sizeOfExpression = new PrimitiveExpression(1);
break;
case 16:
sizeOfExpression = new PrimitiveExpression(2);
break;
case 32:
sizeOfExpression = new PrimitiveExpression(4);
break;
case 64:
sizeOfExpression = new PrimitiveExpression(8);
break;
default:
sizeOfExpression = new SizeOfExpression { Type = AstBuilder.ConvertType(type) };
break;
}
BinaryOperatorExpression boe = expr as BinaryOperatorExpression;
if (boe != null && boe.Operator == BinaryOperatorType.Multiply && sizeOfExpression.IsMatch(boe.Right))
return boe.Left.Detach();
if (sizeOfExpression.IsMatch(expr))
return new PrimitiveExpression(1);
return new BinaryOperatorExpression(expr, BinaryOperatorType.Divide, sizeOfExpression);
}
Expression MakeDefaultValue(TypeReference type)
{
TypeDefinition typeDef = type.Resolve();
if (typeDef != null) {
if (TypeAnalysis.IsIntegerOrEnum(typeDef))
return AstBuilder.MakePrimitive(0, typeDef);
else if (!typeDef.IsValueType)
return new NullReferenceExpression();
switch (typeDef.FullName) {
case "System.Nullable`1":
return new NullReferenceExpression();
case "System.Single":
return new PrimitiveExpression(0f);
case "System.Double":
return new PrimitiveExpression(0.0);
case "System.Decimal":
return new PrimitiveExpression(0m);
}
}
return new DefaultValueExpression { Type = AstBuilder.ConvertType(type) };
}
AstNode TransformCall(bool isVirtual, ILExpression byteCode, List<Ast.Expression> args)
{
Cecil.MethodReference cecilMethod = (MethodReference)byteCode.Operand;
Cecil.MethodDefinition cecilMethodDef = cecilMethod.Resolve();
Ast.Expression target;
List<Ast.Expression> methodArgs = new List<Ast.Expression>(args);
if (cecilMethod.HasThis) {
target = methodArgs[0];
methodArgs.RemoveAt(0);
// Unpack any DirectionExpression that is used as target for the call
// (calling methods on value types implicitly passes the first argument by reference)
if (target is DirectionExpression) {
target = ((DirectionExpression)target).Expression;
target.Remove(); // detach from DirectionExpression
}
if (cecilMethodDef != null && cecilMethodDef.DeclaringType.IsInterface) {
TypeReference tr = byteCode.Arguments[0].InferredType;
if (tr != null) {
TypeDefinition td = tr.Resolve();
if (td != null && !td.IsInterface) {
// Calling an interface method on a non-interface object:
// we need to introduce an explicit cast
target = target.CastTo(AstBuilder.ConvertType(cecilMethod.DeclaringType));
}
}
}
} else {
target = new TypeReferenceExpression { Type = AstBuilder.ConvertType(cecilMethod.DeclaringType) };
}
if (target is ThisReferenceExpression && !isVirtual) {
// a non-virtual call on "this" might be a "base"-call.
if (cecilMethod.DeclaringType.GetElementType() != methodDef.DeclaringType) {
// If we're not calling a method in the current class; we must be calling one in the base class.
target = new BaseReferenceExpression();
}
}
if (cecilMethod.Name == ".ctor" && cecilMethod.DeclaringType.IsValueType) {
// On value types, the constructor can be called.
// This is equivalent to 'target = new ValueType(args);'.
ObjectCreateExpression oce = new ObjectCreateExpression();
oce.Type = AstBuilder.ConvertType(cecilMethod.DeclaringType);
AdjustArgumentsForMethodCall(cecilMethod, methodArgs);
oce.Arguments.AddRange(methodArgs);
return new AssignmentExpression(target, oce);
}
if (cecilMethod.Name == "Get" && cecilMethod.DeclaringType is ArrayType && methodArgs.Count > 1) {
return target.Indexer(methodArgs);
} else if (cecilMethod.Name == "Set" && cecilMethod.DeclaringType is ArrayType && methodArgs.Count > 2) {
return new AssignmentExpression(target.Indexer(methodArgs.GetRange(0, methodArgs.Count - 1)), methodArgs.Last());
}
// Test whether the method is an accessor:
if (cecilMethodDef != null) {
if (cecilMethodDef.IsGetter && methodArgs.Count == 0) {
foreach (var prop in cecilMethodDef.DeclaringType.Properties) {
if (prop.GetMethod == cecilMethodDef)
return target.Member(prop.Name).WithAnnotation(prop);
}
} else if (cecilMethodDef.IsGetter) { // with parameters
PropertyDefinition indexer = GetIndexer(cecilMethodDef);
if (indexer != null)
return target.Indexer(methodArgs).WithAnnotation(indexer);
} else if (cecilMethodDef.IsSetter && methodArgs.Count == 1) {
foreach (var prop in cecilMethodDef.DeclaringType.Properties) {
if (prop.SetMethod == cecilMethodDef)
return new Ast.AssignmentExpression(target.Member(prop.Name).WithAnnotation(prop), methodArgs[0]);
}
} else if (cecilMethodDef.IsSetter && methodArgs.Count > 1) {
PropertyDefinition indexer = GetIndexer(cecilMethodDef);
if (indexer != null)
return new AssignmentExpression(
target.Indexer(methodArgs.GetRange(0, methodArgs.Count - 1)).WithAnnotation(indexer),
methodArgs[methodArgs.Count - 1]
);
} else if (cecilMethodDef.IsAddOn && methodArgs.Count == 1) {
foreach (var ev in cecilMethodDef.DeclaringType.Events) {
if (ev.AddMethod == cecilMethodDef) {
return new Ast.AssignmentExpression {
Left = target.Member(ev.Name).WithAnnotation(ev),
Operator = AssignmentOperatorType.Add,
Right = methodArgs[0]
};
}
}
} else if (cecilMethodDef.IsRemoveOn && methodArgs.Count == 1) {
foreach (var ev in cecilMethodDef.DeclaringType.Events) {
if (ev.RemoveMethod == cecilMethodDef) {
return new Ast.AssignmentExpression {
Left = target.Member(ev.Name).WithAnnotation(ev),
Operator = AssignmentOperatorType.Subtract,
Right = methodArgs[0]
};
}
}
} else if (cecilMethodDef.Name == "Invoke" && cecilMethodDef.DeclaringType.BaseType != null && cecilMethodDef.DeclaringType.BaseType.FullName == "System.MulticastDelegate") {
AdjustArgumentsForMethodCall(cecilMethod, methodArgs);
return target.Invoke(methodArgs);
}
}
// Default invocation
AdjustArgumentsForMethodCall(cecilMethodDef ?? cecilMethod, methodArgs);
return target.Invoke(cecilMethod.Name, ConvertTypeArguments(cecilMethod), methodArgs).WithAnnotation(cecilMethod);
}
static void AdjustArgumentsForMethodCall(MethodReference cecilMethod, List<Expression> methodArgs)
{
// Convert 'ref' into 'out' where necessary
for (int i = 0; i < methodArgs.Count && i < cecilMethod.Parameters.Count; i++) {
DirectionExpression dir = methodArgs[i] as DirectionExpression;
if (dir != null && cecilMethod.Parameters[i].IsOut)
dir.FieldDirection = FieldDirection.Out;
}
}
static PropertyDefinition GetIndexer(MethodDefinition cecilMethodDef)
{
TypeDefinition typeDef = cecilMethodDef.DeclaringType;
string indexerName = null;
foreach (CustomAttribute ca in typeDef.CustomAttributes) {
if (ca.Constructor.FullName == "System.Void System.Reflection.DefaultMemberAttribute::.ctor(System.String)") {
indexerName = ca.ConstructorArguments.Single().Value as string;
break;
}
}
if (indexerName == null)
return null;
foreach (PropertyDefinition prop in typeDef.Properties) {
if (prop.Name == indexerName) {
if (prop.GetMethod == cecilMethodDef || prop.SetMethod == cecilMethodDef)
return prop;
}
}
return null;
}
#if DEBUG
static readonly ConcurrentDictionary<ILCode, int> unhandledOpcodes = new ConcurrentDictionary<ILCode, int>();
#endif
[Conditional("DEBUG")]
public static void ClearUnhandledOpcodes()
{
#if DEBUG
unhandledOpcodes.Clear();
#endif
}
[Conditional("DEBUG")]
public static void PrintNumberOfUnhandledOpcodes()
{
#if DEBUG
foreach (var pair in unhandledOpcodes) {
Debug.WriteLine("AddMethodBodyBuilder unhandled opcode: {1}x {0}", pair.Key, pair.Value);
}
#endif
}
static Expression InlineAssembly(ILExpression byteCode, List<Ast.Expression> args)
{
#if DEBUG
unhandledOpcodes.AddOrUpdate(byteCode.Code, c => 1, (c, n) => n+1);
#endif
// Output the operand of the unknown IL code as well
if (byteCode.Operand != null) {
args.Insert(0, new IdentifierExpression(FormatByteCodeOperand(byteCode.Operand)));
}
return new IdentifierExpression(byteCode.Code.GetName()).Invoke(args);
}
static string FormatByteCodeOperand(object operand)
{
if (operand == null) {
return string.Empty;
//} else if (operand is ILExpression) {
// return string.Format("IL_{0:X2}", ((ILExpression)operand).Offset);
} else if (operand is MethodReference) {
return ((MethodReference)operand).Name + "()";
} else if (operand is Cecil.TypeReference) {
return ((Cecil.TypeReference)operand).FullName;
} else if (operand is VariableDefinition) {
return ((VariableDefinition)operand).Name;
} else if (operand is ParameterDefinition) {
return ((ParameterDefinition)operand).Name;
} else if (operand is FieldReference) {
return ((FieldReference)operand).Name;
} else if (operand is string) {
return "\"" + operand + "\"";
} else if (operand is int) {
return operand.ToString();
} else {
return operand.ToString();
}
}
static IEnumerable<AstType> ConvertTypeArguments(MethodReference cecilMethod)
{
GenericInstanceMethod g = cecilMethod as GenericInstanceMethod;
if (g == null)
return null;
if (g.GenericArguments.Any(ta => ta.ContainsAnonymousType()))
return null;
return g.GenericArguments.Select(t => AstBuilder.ConvertType(t));
}
static Ast.DirectionExpression MakeRef(Ast.Expression expr)
{
return new DirectionExpression { Expression = expr, FieldDirection = FieldDirection.Ref };
}
Ast.Expression Convert(Ast.Expression expr, Cecil.TypeReference actualType, Cecil.TypeReference reqType)
{
if (actualType == null || reqType == null || TypeAnalysis.IsSameType(actualType, reqType)) {
return expr;
} else if (actualType is ByReferenceType && reqType is PointerType && expr is DirectionExpression) {
return Convert(
new UnaryOperatorExpression(UnaryOperatorType.AddressOf, ((DirectionExpression)expr).Expression.Detach()),
new PointerType(((ByReferenceType)actualType).ElementType),
reqType);
} else if (actualType is PointerType && reqType is ByReferenceType) {
expr = Convert(expr, actualType, new PointerType(((ByReferenceType)reqType).ElementType));
return new DirectionExpression {
FieldDirection = FieldDirection.Ref,
Expression = new UnaryOperatorExpression(UnaryOperatorType.Dereference, expr)
};
} else if (actualType is PointerType && reqType is PointerType) {
if (actualType.FullName != reqType.FullName)
return expr.CastTo(AstBuilder.ConvertType(reqType));
else
return expr;
} else {
bool actualIsIntegerOrEnum = TypeAnalysis.IsIntegerOrEnum(actualType);
bool requiredIsIntegerOrEnum = TypeAnalysis.IsIntegerOrEnum(reqType);
if (TypeAnalysis.IsBoolean(reqType)) {
if (TypeAnalysis.IsBoolean(actualType))
return expr;
if (actualIsIntegerOrEnum) {
return new BinaryOperatorExpression(expr, BinaryOperatorType.InEquality, AstBuilder.MakePrimitive(0, actualType));
} else {
return new BinaryOperatorExpression(expr, BinaryOperatorType.InEquality, new NullReferenceExpression());
}
}
if (TypeAnalysis.IsBoolean(actualType) && requiredIsIntegerOrEnum) {
return new ConditionalExpression {
Condition = expr,
TrueExpression = AstBuilder.MakePrimitive(1, reqType),
FalseExpression = AstBuilder.MakePrimitive(0, reqType)
};
}
if (expr is PrimitiveExpression && !requiredIsIntegerOrEnum && TypeAnalysis.IsEnum(actualType))
{
return expr.CastTo(AstBuilder.ConvertType(actualType));
}
bool actualIsPrimitiveType = actualIsIntegerOrEnum
|| actualType.MetadataType == MetadataType.Single || actualType.MetadataType == MetadataType.Double;
bool requiredIsPrimitiveType = requiredIsIntegerOrEnum
|| reqType.MetadataType == MetadataType.Single || reqType.MetadataType == MetadataType.Double;
if (actualIsPrimitiveType && requiredIsPrimitiveType) {
return expr.CastTo(AstBuilder.ConvertType(reqType));
}
return expr;
}
}
}
}