diff options
Diffstat (limited to 'Source/Core/AbsyType.cs')
| -rw-r--r-- | Source/Core/AbsyType.cs | 214 |
1 files changed, 212 insertions, 2 deletions
diff --git a/Source/Core/AbsyType.cs b/Source/Core/AbsyType.cs index 2953f15e..96de5c0b 100644 --- a/Source/Core/AbsyType.cs +++ b/Source/Core/AbsyType.cs @@ -244,6 +244,11 @@ namespace Microsoft.Boogie { return false; } } + public virtual bool IsFloat { + get { + return false; + } + } public virtual bool IsBool { get { return false; @@ -320,6 +325,29 @@ namespace Microsoft.Boogie { } } + public virtual bool isFloat { + get { + return false; + } + } + public virtual int FloatExponent + { + get + { + { + Contract.Assert(false); + throw new cce.UnreachableException(); + } // Type.FloatExponent should never be called + } + } + public virtual int FloatMantissa { + get { + { + Contract.Assert(false); + throw new cce.UnreachableException(); + } // Type.FloatMantissa should never be called + } + } public virtual bool IsBv { get { return false; @@ -358,6 +386,14 @@ namespace Microsoft.Boogie { } } + static public FloatType GetFloatType(int exp, int man) { + Contract.Requires(0 <= exp); + Contract.Requires(0 <= man); + Contract.Ensures(Contract.Result<FloatType>() != null); + + return new FloatType(exp, man); + } + //------------ Match formal argument types on actual argument types //------------ and return the resulting substitution of type variables @@ -1008,6 +1044,165 @@ namespace Microsoft.Boogie { //===================================================================== + //Note that the functions in this class were directly copied from the BV class just below + public class FloatType : Type { + public readonly int Mantissa; //Size of mantissa in bits + public readonly int Exponent; //Size of exponent in bits + + public FloatType(IToken token, int exponent, int mantissa) + : base(token) { + Contract.Requires(token != null); + Exponent = exponent; + Mantissa = mantissa; + } + + public FloatType(int exponent, int mantissa) + : base(Token.NoToken) { + Exponent = exponent; + Mantissa = mantissa; + } + + //----------- Cloning ---------------------------------- + // We implement our own clone-method, because bound type variables + // have to be created in the right way. It is /not/ ok to just clone + // everything recursively. + + public override Type Clone(IDictionary<TypeVariable/*!*/, TypeVariable/*!*/>/*!*/ varMap) + { + //Contract.Requires(cce.NonNullElements(varMap)); + Contract.Ensures(Contract.Result<Type>() != null); + // FloatTypes are immutable anyway, we do not clone + return this; + } + + public override Type CloneUnresolved() + { + Contract.Ensures(Contract.Result<Type>() != null); + return this; + } + + //----------- Linearisation ---------------------------------- + + public override void Emit(TokenTextWriter stream, int contextBindingStrength) + { + //Contract.Requires(stream != null); + // no parentheses are necessary for bitvector-types + stream.SetToken(this); + stream.Write("{0}", this); + } + + public override string ToString() + { + Contract.Ensures(Contract.Result<string>() != null); + return "float (" + Exponent + " " + Mantissa + ")"; + } + + //----------- Equality ---------------------------------- + + [Pure] + public override bool Equals(Type/*!*/ that, + List<TypeVariable>/*!*/ thisBoundVariables, + List<TypeVariable>/*!*/ thatBoundVariables) + { + FloatType thatFloatType = TypeProxy.FollowProxy(that.Expanded) as FloatType; + return thatFloatType != null && this.Mantissa == thatFloatType.Mantissa && this.Exponent == thatFloatType.Exponent; + } + + //----------- Unification of types ----------- + + public override bool Unify(Type/*!*/ that, + List<TypeVariable>/*!*/ unifiableVariables, + // an idempotent substitution that describes the + // unification result up to a certain point + IDictionary<TypeVariable/*!*/, Type/*!*/>/*!*/ unifier) + { + //Contract.Requires(that != null); + //Contract.Requires(unifiableVariables != null); + //Contract.Requires(cce.NonNullElements(unifier)); + that = that.Expanded; + if (that is TypeProxy || that is TypeVariable) { + return that.Unify(this, unifiableVariables, unifier); + } + else { + return this.Equals(that); + } + } + + //----------- Substitution of free variables with types not containing bound variables ----------------- + + public override Type Substitute(IDictionary<TypeVariable/*!*/, Type/*!*/>/*!*/ subst) + { + Contract.Ensures(Contract.Result<Type>() != null); + return this; + } + + //----------- Hashcodes ---------------------------------- + + [Pure] + public override int GetHashCode(List<TypeVariable> boundVariables) + { + return this.Mantissa.GetHashCode() + this.Exponent.GetHashCode(); + } + + //----------- Resolution ---------------------------------- + + public override Type ResolveType(ResolutionContext rc) + { + //Contract.Requires(rc != null); + Contract.Ensures(Contract.Result<Type>() != null); + // nothing to resolve + return this; + } + + // determine the free variables in a type, in the order in which the variables occur + public override List<TypeVariable>/*!*/ FreeVariables + { + get + { + Contract.Ensures(Contract.Result<List<TypeVariable>>() != null); + + return new List<TypeVariable>(); // bitvector-type are closed + } + } + + public override List<TypeProxy/*!*/>/*!*/ FreeProxies + { + get + { + Contract.Ensures(cce.NonNullElements(Contract.Result<List<TypeProxy>>())); + return new List<TypeProxy/*!*/>(); + } + } + + //----------- Getters/Issers ---------------------------------- + + public override bool IsFloat { + get { + return true; + } + } + public override int FloatMantissa { + get { + return Mantissa; + } + } + public override int FloatExponent { + get { + return Exponent; + } + } + + public override Absy StdDispatch(StandardVisitor visitor) + { + //Contract.Requires(visitor != null); + Contract.Ensures(Contract.Result<Absy>() != null); + return visitor.VisitFloatType(this); + } + + } + + //===================================================================== + public class BvType : Type { public readonly int Bits; @@ -1899,6 +2094,12 @@ Contract.Requires(that != null); return p != null && p.IsReal; } } + public override bool IsFloat { + get { + Type p = ProxyFor; + return p != null && p.IsFloat; + } + } public override bool IsBool { get { Type p = ProxyFor; @@ -2747,11 +2948,20 @@ Contract.Requires(that != null); return ExpandedType.IsInt; } } - public override bool IsReal { - get { + public override bool IsReal + { + get + { return ExpandedType.IsReal; } } + public override bool IsFloat + { + get + { + return ExpandedType.IsFloat; + } + } public override bool IsBool { get { return ExpandedType.IsBool; |