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//
// BoxedExpressionEncoder.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.Providers;
using Mono.CodeContracts.Static.Proving;
namespace Mono.CodeContracts.Static.Analysis.Numerical {
class BoxedExpressionEncoder<TVar> : IExpressionEncoder<BoxedVariable<TVar>, BoxedExpression> {
readonly IMetaDataProvider metadata;
public BoxedExpressionEncoder (IMetaDataProvider metadata)
{
this.metadata = metadata;
}
public void ResetFreshVariableCounter ()
{
BoxedVariable<TVar>.ResetFreshVariableCounter ();
}
public BoxedVariable<TVar> FreshVariable ()
{
return BoxedVariable<TVar>.SlackVariable ();
}
public BoxedExpression VariableFor (BoxedVariable<TVar> var)
{
return BoxedExpression.Var (var);
}
public BoxedExpression ConstantFor (object value)
{
if (value is int)
return BoxedExpression.Const (value, metadata.System_Int32);
if (value is long) {
var val = (long) value;
return val < int.MaxValue && val > int.MinValue
? BoxedExpression.Const (val, metadata.System_Int32)
: BoxedExpression.Const (val, metadata.System_Int64);
}
if (value is short)
return BoxedExpression.Const (value, metadata.System_Int16);
if (value is sbyte)
return BoxedExpression.Const (value, metadata.System_Int8);
if (value is bool)
return BoxedExpression.Const (value, metadata.System_Boolean);
throw new NotSupportedException ();
}
public BoxedExpression CompoundFor (ExpressionType type, ExpressionOperator op, BoxedExpression arg)
{
return BoxedExpression.Unary (ToUnaryOperator (op), arg);
}
public BoxedExpression CompoundFor (ExpressionType type, ExpressionOperator op, BoxedExpression left,
BoxedExpression right)
{
return BoxedExpression.Binary (ToBinaryOperator (op), left, right);
}
public static IExpressionEncoder<BoxedVariable<TVar>, BoxedExpression> Encoder (
IMetaDataProvider provider)
{
return new BoxedExpressionEncoder<TVar> (provider);
}
BinaryOperator ToBinaryOperator (ExpressionOperator op)
{
switch (op) {
case ExpressionOperator.And:
return BinaryOperator.And;
case ExpressionOperator.Or:
return BinaryOperator.Or;
case ExpressionOperator.Xor:
return BinaryOperator.Xor;
case ExpressionOperator.Equal:
return BinaryOperator.Ceq;
case ExpressionOperator.Equal_Obj:
return BinaryOperator.Cobjeq;
case ExpressionOperator.NotEqual:
return BinaryOperator.Cne_Un;
case ExpressionOperator.LessThan:
return BinaryOperator.Clt;
case ExpressionOperator.LessEqualThan:
return BinaryOperator.Cle_Un;
case ExpressionOperator.GreaterThan:
return BinaryOperator.Cgt;
case ExpressionOperator.GreaterEqualThan:
return BinaryOperator.Cge;
case ExpressionOperator.Add:
return BinaryOperator.Add;
case ExpressionOperator.Sub:
return BinaryOperator.Sub;
case ExpressionOperator.Mult:
return BinaryOperator.Mul;
case ExpressionOperator.Div:
return BinaryOperator.Div;
case ExpressionOperator.Mod:
return BinaryOperator.Rem;
default:
throw new ArgumentOutOfRangeException ("op");
}
}
UnaryOperator ToUnaryOperator (ExpressionOperator op)
{
switch (op) {
case ExpressionOperator.Not:
return UnaryOperator.Not;
case ExpressionOperator.UnaryMinus:
return UnaryOperator.Neg;
default:
throw new ArgumentOutOfRangeException ("op");
}
}
}
}
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