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//
// ValueExpressionDecoder.cs
//
// Authors:
// Alexander Chebaturkin (chebaturkin@gmail.com)
//
// Copyright (C) 2012 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;
using Mono.CodeContracts.Static.AST;
using Mono.CodeContracts.Static.AST.Visitors;
using Mono.CodeContracts.Static.Analysis.ExpressionAnalysis.Decoding;
using Mono.CodeContracts.Static.DataStructures;
using Mono.CodeContracts.Static.Lattices;
using Mono.CodeContracts.Static.Providers;
namespace Mono.CodeContracts.Static.Analysis.Numerical {
class ValueExpressionDecoder<TVar, TExpr> : FullExpressionDecoder<TVar, TExpr>, IExpressionDecoder<TVar, TExpr>
where TVar : IEquatable<TVar>
where TExpr : IEquatable<TExpr> {
readonly VisitorForOperatorFor operator_for;
readonly VisitorForTypeOf type_of;
public ValueExpressionDecoder (IMetaDataProvider metaDataProvider, IExpressionContextProvider<TExpr, TVar> contextProvider)
: base (metaDataProvider, contextProvider)
{
operator_for = new VisitorForOperatorFor ();
type_of = new VisitorForTypeOf ();
}
IExpressionContext<TExpr, TVar> ExpressionContext { get { return ContextProvider.ExpressionContext; } }
#region IExpressionDecoder<TVar,TExpr> Members
public ExpressionOperator OperatorFor (TExpr expr)
{
return ExpressionContext.Decode<TExpr, ExpressionOperator, VisitorForOperatorFor> (expr, operator_for, expr);
}
public TExpr LeftExpressionFor (TExpr expr)
{
UnaryOperator op;
BinaryOperator bop;
TExpr left;
TExpr right;
if (IsUnaryExpression (expr, out op, out left) || IsBinaryExpression (expr, out bop, out left, out right))
return left;
throw new InvalidOperationException ();
}
public TExpr RightExpressionFor (TExpr expr)
{
BinaryOperator bop;
TExpr left;
TExpr right;
if (IsBinaryExpression (expr, out bop, out left, out right))
return right;
throw new InvalidOperationException ();
}
public bool IsConstant (TExpr expr)
{
return OperatorFor (expr) == ExpressionOperator.Constant;
}
public bool IsVariable (TExpr expr)
{
object variable;
return base.IsVariable (expr, out variable);
}
public bool TryValueOf<T> (TExpr e, ExpressionType expectedType, out T result)
{
object value;
TypeNode actualType;
if (base.IsConstant (e, out value, out actualType)) {
if (value is T)
return true.With ((T) value, out result);
if (value is int && expectedType == ExpressionType.Bool) {
result = (T) (object) ((int) value != 0);
return true;
}
}
return false.Without (out result);
}
public bool TrySizeOf (TExpr expr, out int size)
{
TypeNode type;
if (VisitorForSizeOf<TVar, TExpr>.IsSizeOf (expr, out type, this)) {
size = MetaDataProvider.TypeSize (type);
return size != -1;
}
return false.Without (out size);
}
public ExpressionType TypeOf (TExpr expr)
{
if (IsConstant (expr))
return ExpressionContext.Decode<Dummy, ExpressionType, VisitorForTypeOf> (expr, type_of, Dummy.Value);
var abstractType = ExpressionContext.GetType (expr);
if (abstractType.IsNormal ()) {
var type = abstractType.Value;
if (MetaDataProvider.IsPrimitive (type)) {
if (MetaDataProvider.Equal (type, MetaDataProvider.System_Int32))
return ExpressionType.Int32;
if (MetaDataProvider.Equal (type, MetaDataProvider.System_Single))
return ExpressionType.Float32;
if (MetaDataProvider.Equal (type, MetaDataProvider.System_Double))
return ExpressionType.Float64;
if (MetaDataProvider.Equal (type, MetaDataProvider.System_Boolean))
return ExpressionType.Bool;
}
}
return ExpressionType.Unknown;
}
public bool IsConstantInt (TExpr expr, out int value)
{
TypeNode type;
object objValue;
if (IsConstant (expr, out objValue, out type))
return true.With ((int) objValue, out value);
return false.Without (out value);
}
public string NameOf (TVar variable)
{
return variable.ToString ();
}
public bool IsBinaryExpression (TExpr expr)
{
BinaryOperator op;
TExpr left;
TExpr right;
return IsBinaryExpression (expr, out op, out left, out right);
}
#endregion
#region Nested type: VisitorForOperatorFor
class VisitorForOperatorFor : ISymbolicExpressionVisitor<TExpr, TExpr, TVar, TExpr, ExpressionOperator> {
#region ISymbolicExpressionVisitor<TExpr,TExpr,TVar,TExpr,ExpressionOperator> Members
public ExpressionOperator Binary (TExpr pc, BinaryOperator bop, TVar dest, TExpr src1, TExpr src2, TExpr data)
{
switch (bop) {
case BinaryOperator.Add:
case BinaryOperator.Add_Ovf:
case BinaryOperator.Add_Ovf_Un:
return ExpressionOperator.Add;
case BinaryOperator.And:
return ExpressionOperator.And;
case BinaryOperator.Ceq:
return ExpressionOperator.Equal;
case BinaryOperator.Cobjeq:
return ExpressionOperator.Equal_Obj;
case BinaryOperator.Cne_Un:
return ExpressionOperator.NotEqual;
case BinaryOperator.Cge:
case BinaryOperator.Cge_Un:
return ExpressionOperator.GreaterEqualThan;
case BinaryOperator.Cgt:
case BinaryOperator.Cgt_Un:
return ExpressionOperator.GreaterThan;
case BinaryOperator.Cle:
case BinaryOperator.Cle_Un:
return ExpressionOperator.LessEqualThan;
case BinaryOperator.Clt:
case BinaryOperator.Clt_Un:
return ExpressionOperator.LessThan;
case BinaryOperator.Div:
case BinaryOperator.Div_Un:
return ExpressionOperator.Div;
case BinaryOperator.LogicalAnd:
return ExpressionOperator.LogicalAnd;
case BinaryOperator.LogicalOr:
return ExpressionOperator.LogicalOr;
case BinaryOperator.Mul:
case BinaryOperator.Mul_Ovf:
case BinaryOperator.Mul_Ovf_Un:
return ExpressionOperator.Mult;
case BinaryOperator.Or:
return ExpressionOperator.Or;
case BinaryOperator.Rem:
case BinaryOperator.Rem_Un:
return ExpressionOperator.Mod;
case BinaryOperator.Sub:
case BinaryOperator.Sub_Ovf:
case BinaryOperator.Sub_Ovf_Un:
return ExpressionOperator.Sub;
case BinaryOperator.Xor:
return ExpressionOperator.Xor;
default:
return ExpressionOperator.Unknown;
}
}
public ExpressionOperator Unary (TExpr pc, UnaryOperator uop, bool unsigned, TVar dest, TExpr source, TExpr data)
{
switch (uop) {
case UnaryOperator.Conv_i:
case UnaryOperator.Conv_i1:
case UnaryOperator.Conv_i2:
case UnaryOperator.Conv_i4:
case UnaryOperator.Conv_i8:
return ExpressionOperator.ConvertToInt32;
case UnaryOperator.Neg:
return ExpressionOperator.Not;
case UnaryOperator.Not:
return ExpressionOperator.Not;
default:
return ExpressionOperator.Unknown;
}
}
public ExpressionOperator LoadNull (TExpr pc, TVar dest, TExpr polarity)
{
return ExpressionOperator.Constant;
}
public ExpressionOperator LoadConst (TExpr pc, TypeNode type, object constant, TVar dest, TExpr data)
{
return ExpressionOperator.Constant;
}
public ExpressionOperator Sizeof (TExpr pc, TypeNode type, TVar dest, TExpr data)
{
return ExpressionOperator.SizeOf;
}
public ExpressionOperator Isinst (TExpr pc, TypeNode type, TVar dest, TExpr obj, TExpr data)
{
return ExpressionOperator.Unknown;
}
public ExpressionOperator SymbolicConstant (TExpr pc, TVar variable, TExpr data)
{
return ExpressionOperator.Variable;
}
#endregion
}
#endregion
#region Nested type: VisitorForTypeOf
class VisitorForTypeOf : ISymbolicExpressionVisitor<TExpr, TExpr, TVar, Dummy, ExpressionType> {
#region ISymbolicExpressionVisitor<TExpr,TExpr,TVar,Dummy,ExpressionType> Members
public ExpressionType Binary (TExpr pc, BinaryOperator bop, TVar dest, TExpr src1, TExpr src2, Dummy data)
{
return ExpressionType.Unknown;
}
public ExpressionType Unary (TExpr pc, UnaryOperator uop, bool unsigned, TVar dest, TExpr source, Dummy data)
{
return ExpressionType.Unknown;
}
public ExpressionType LoadNull (TExpr pc, TVar dest, Dummy polarity)
{
return ExpressionType.Unknown;
}
public ExpressionType LoadConst (TExpr pc, TypeNode type, object constant, TVar dest, Dummy data)
{
if (constant is int)
return ExpressionType.Int32;
if (constant is float)
return ExpressionType.Float32;
if (constant is double)
return ExpressionType.Float64;
if (constant is bool)
return ExpressionType.Bool;
return ExpressionType.Unknown;
}
public ExpressionType Sizeof (TExpr pc, TypeNode type, TVar dest, Dummy data)
{
return ExpressionType.Int32;
}
public ExpressionType Isinst (TExpr pc, TypeNode type, TVar dest, TExpr obj, Dummy data)
{
return ExpressionType.Unknown;
}
public ExpressionType SymbolicConstant (TExpr pc, TVar variable, Dummy data)
{
return ExpressionType.Unknown;
}
#endregion
}
#endregion
}
}
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