134 lines
4.1 KiB
C#
134 lines
4.1 KiB
C#
//
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// BasicFacts.cs
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//
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// Authors:
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// Alexander Chebaturkin (chebaturkin@gmail.com)
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//
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// Copyright (C) 2011 Alexander Chebaturkin
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using Mono.CodeContracts.Static.Analysis;
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using Mono.CodeContracts.Static.ControlFlow;
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using Mono.CodeContracts.Static.DataStructures;
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using Mono.CodeContracts.Static.Lattices;
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namespace Mono.CodeContracts.Static.Proving {
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class BasicFacts<Expression, Variable> : IFactQuery<BoxedExpression, Variable> {
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protected IExpressionContextProvider<Expression, Variable> ContextProvider;
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protected IFactBase<Variable> FactBase;
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protected Predicate<APC> isUnreachable;
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public BasicFacts (IExpressionContextProvider<Expression, Variable> contextProvider, IFactBase<Variable> factBase, Predicate<APC> isUnreachable)
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{
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this.ContextProvider = contextProvider;
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this.FactBase = factBase;
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this.isUnreachable = isUnreachable;
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}
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#region Implementation of IFactBase<Variable>
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public FlatDomain<bool> IsNull(APC pc, Variable variable)
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{
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return this.FactBase.IsNull (pc, variable);
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}
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public FlatDomain<bool> IsNonNull(APC pc, Variable variable)
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{
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return this.FactBase.IsNonNull (pc, variable);
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}
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public bool IsUnreachable (APC pc)
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{
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if (this.isUnreachable != null && this.isUnreachable (pc))
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return true;
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return this.FactBase.IsUnreachable (pc);
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}
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protected static bool TryVariable (BoxedExpression e, out Variable v)
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{
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object underlyingVariable = e.UnderlyingVariable;
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if (underlyingVariable is Variable) {
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v = (Variable) underlyingVariable;
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return true;
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}
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v = default(Variable);
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return false;
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}
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#endregion
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#region Implementation of IFactQuery<BoxedExpression,Variable>
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public virtual FlatDomain<bool> IsNull(APC pc, BoxedExpression expr)
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{
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Variable v;
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if (TryVariable (expr, out v)) {
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FlatDomain<bool> outcome = this.FactBase.IsNull(pc, v);
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if (!outcome.IsTop)
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return outcome;
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}
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return ProofOutcome.Top;
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}
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public virtual FlatDomain<bool> IsNonNull(APC pc, BoxedExpression expr)
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{
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Variable v;
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if (TryVariable (expr, out v)) {
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FlatDomain<bool> outcome = this.FactBase.IsNonNull(pc, v);
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if (!outcome.IsTop)
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return outcome;
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}
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return ProofOutcome.Top;
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}
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public FlatDomain<bool> IsTrue(APC pc, BoxedExpression expr)
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{
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return IsNonZero (pc, expr);
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}
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public FlatDomain<bool> IsTrueImply(APC pc, Sequence<BoxedExpression> positiveAssumptions, Sequence<BoxedExpression> negativeAssumptions, BoxedExpression goal)
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{
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FlatDomain<bool> outcome = IsTrue(pc, goal);
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if (outcome.IsTrue() || outcome.IsBottom)
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return outcome;
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return ProofOutcome.Top;
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}
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public FlatDomain<bool> IsGreaterEqualToZero(APC pc, BoxedExpression expr)
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{
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return ProofOutcome.Top;
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}
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public FlatDomain<bool> IsLessThan(APC pc, BoxedExpression expr, BoxedExpression right)
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{
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return ProofOutcome.Top;
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}
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public FlatDomain<bool> IsNonZero(APC pc, BoxedExpression expr)
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{
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return IsNonNull (pc, expr);
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}
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#endregion
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}
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}
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