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//
// BoxedExpressionDecoder.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.Analysis.ExpressionAnalysis.Decoding;
using Mono.CodeContracts.Static.DataStructures;
using Mono.CodeContracts.Static.Proving;
namespace Mono.CodeContracts.Static.Analysis.Numerical {
class BoxedExpressionDecoder<TVar, TExpr> : IExpressionDecoder<BoxedVariable<TVar>, BoxedExpression> {
public IFullExpressionDecoder<TVar, TExpr> ExternalDecoder { get; private set; }
public BoxedExpressionDecoder (IFullExpressionDecoder<TVar, TExpr> externalDecoder)
{
ExternalDecoder = externalDecoder;
}
public ExpressionOperator OperatorFor (BoxedExpression expr)
{
if (expr.IsVariable)
return ExpressionOperator.Variable;
if (expr.IsConstant)
return ExpressionOperator.Constant;
if (expr.IsSizeof)
return ExpressionOperator.SizeOf;
if (expr.IsUnary)
switch (expr.UnaryOperator) {
case UnaryOperator.Conv_i:
case UnaryOperator.Conv_i4:
case UnaryOperator.Conv_i8:
return ExpressionOperator.ConvertToInt32;
case UnaryOperator.Neg:
return ExpressionOperator.UnaryMinus;
case UnaryOperator.Not:
return ExpressionOperator.Not;
default:
return ExpressionOperator.Unknown;
}
if (!expr.IsBinary)
return ExpressionOperator.Unknown;
switch (expr.BinaryOperator) {
case BinaryOperator.Add:
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:
return ExpressionOperator.GreaterEqualThan;
case BinaryOperator.Cgt:
return ExpressionOperator.GreaterThan;
case BinaryOperator.Cle:
return ExpressionOperator.LessEqualThan;
case BinaryOperator.Clt:
return ExpressionOperator.LessThan;
case BinaryOperator.Div:
return ExpressionOperator.Div;
case BinaryOperator.LogicalAnd:
return ExpressionOperator.LogicalAnd;
case BinaryOperator.LogicalOr:
return ExpressionOperator.LogicalOr;
case BinaryOperator.Mul:
return ExpressionOperator.Mult;
case BinaryOperator.Or:
return ExpressionOperator.Or;
case BinaryOperator.Rem:
return ExpressionOperator.Mod;
case BinaryOperator.Sub:
return ExpressionOperator.Sub;
case BinaryOperator.Xor:
return ExpressionOperator.Xor;
default:
return ExpressionOperator.Unknown;
}
}
public BoxedExpression LeftExpressionFor (BoxedExpression expr)
{
if (expr.IsBinary)
return expr.BinaryLeftArgument;
if (expr.IsUnary)
return expr.UnaryArgument;
throw new InvalidOperationException ();
}
public BoxedExpression RightExpressionFor (BoxedExpression expr)
{
if (expr.IsBinary)
return expr.BinaryRightArgument;
throw new InvalidOperationException ();
}
public ExpressionType TypeOf (BoxedExpression expr)
{
if (expr.IsConstant) {
var constant = expr.Constant;
if (constant == null)
return ExpressionType.Unknown;
var convertible = constant as IConvertible;
if (convertible != null)
switch (convertible.GetTypeCode ()) {
case TypeCode.Boolean:
return ExpressionType.Bool;
case TypeCode.Int32:
return ExpressionType.Int32;
case TypeCode.Single:
return ExpressionType.Float32;
case TypeCode.Double:
return ExpressionType.Float64;
}
return ExpressionType.Unknown;
}
if (expr.IsUnary) {
switch (expr.UnaryOperator) {
case UnaryOperator.Conv_i4:
return ExpressionType.Int32;
case UnaryOperator.Conv_r4:
return ExpressionType.Float32;
case UnaryOperator.Conv_r8:
case UnaryOperator.Conv_r_un:
return ExpressionType.Float64;
case UnaryOperator.Not:
return ExpressionType.Bool;
default:
return ExpressionType.Int32;
}
}
if (expr.IsBinary)
switch (expr.BinaryOperator) {
case BinaryOperator.Add:
case BinaryOperator.Add_Ovf:
case BinaryOperator.Add_Ovf_Un:
case BinaryOperator.Div:
case BinaryOperator.Div_Un:
case BinaryOperator.Mul:
case BinaryOperator.Mul_Ovf:
case BinaryOperator.Mul_Ovf_Un:
case BinaryOperator.Rem:
case BinaryOperator.Rem_Un:
case BinaryOperator.Sub:
case BinaryOperator.Sub_Ovf:
case BinaryOperator.Sub_Ovf_Un:
return Join (TypeOf (expr.BinaryLeftArgument),
TypeOf (expr.BinaryRightArgument));
case BinaryOperator.Ceq:
case BinaryOperator.Cobjeq:
case BinaryOperator.Cne_Un:
case BinaryOperator.Cge:
case BinaryOperator.Cge_Un:
case BinaryOperator.Cgt:
case BinaryOperator.Cgt_Un:
case BinaryOperator.Cle:
case BinaryOperator.Cle_Un:
case BinaryOperator.Clt:
case BinaryOperator.Clt_Un:
return ExpressionType.Bool;
default:
return ExpressionType.Int32;
}
return ExpressionType.Unknown;
}
public BoxedVariable<TVar> UnderlyingVariable (BoxedExpression expr)
{
var uv = expr.UnderlyingVariable;
if (uv is TVar)
return new BoxedVariable<TVar> ((TVar) expr.UnderlyingVariable);
var boxed = uv as BoxedVariable<TVar>;
return boxed ?? BoxedVariable<TVar>.SlackVariable ();
}
public bool IsConstant (BoxedExpression expr)
{
return expr.IsConstant;
}
public bool IsVariable (BoxedExpression expr)
{
return expr.IsVariable;
}
public bool TryValueOf<T> (BoxedExpression expr, ExpressionType type, out T result)
{
if (!expr.IsConstant)
return false.Without (out result);
var constant = expr.Constant;
if (constant == null)
return false.Without (out result);
if (constant is T)
return true.With ((T) constant, out result);
if (constant is string)
return false.Without (out result);
var convertible = constant as IConvertible;
if (convertible != null)
try {
return true.With ((T) convertible.ToType (typeof (T), null), out result);
}
catch {
}
return false.Without (out result);
}
public bool TrySizeOf (BoxedExpression expr, out int size)
{
return expr.Sizeof (out size);
}
public bool IsNull (BoxedExpression expr)
{
return expr.IsConstant && expr.IsNull;
}
public bool IsConstantInt (BoxedExpression expr, out int value)
{
return expr.IsConstantIntOrNull (out value);
}
public string NameOf (BoxedVariable<TVar> variable)
{
return variable.ToString ();
}
public bool IsBinaryExpression (BoxedExpression expr)
{
return expr.IsBinary;
}
ExpressionType Join (ExpressionType left, ExpressionType right)
{
if (left == right)
return left;
if (left == ExpressionType.Unknown)
return right;
if (right == ExpressionType.Unknown)
return left;
if (left == ExpressionType.Float32 || right == ExpressionType.Float32)
return ExpressionType.Float32;
if (left == ExpressionType.Float64 || right == ExpressionType.Float64)
return ExpressionType.Float64;
return left;
}
}
}
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