135 lines
4.9 KiB
C#
135 lines
4.9 KiB
C#
//
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// AssertionFinder.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 System.Collections.Generic;
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using Mono.CodeContracts.Static.AST.Visitors;
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using Mono.CodeContracts.Static.Analysis.Drivers;
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using Mono.CodeContracts.Static.ControlFlow;
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using Mono.CodeContracts.Static.Lattices;
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namespace Mono.CodeContracts.Static.Proving {
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static class AssertionFinder {
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public static void ValidateAssertions<TExpression, TVariable> (IFactQuery<BoxedExpression, TVariable> facts, IMethodDriver<TExpression, TVariable> driver, List<string> proofResults)
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where TExpression : IEquatable<TExpression>
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where TVariable : IEquatable<TVariable>
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{
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Bind<TExpression, TVariable>.ValidateAssertions (facts, driver, proofResults);
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}
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#region Nested type: Bind
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private static class Bind<TExpression, TVariable>
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where TExpression : IEquatable<TExpression>
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where TVariable : IEquatable<TVariable> {
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public static void ValidateAssertions (IFactQuery<BoxedExpression, TVariable> facts, IMethodDriver<TExpression, TVariable> driver, List<string> proofResults)
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{
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APC entryAfterRequires = driver.ContextProvider.MethodContext.CFG.EntryAfterRequires;
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if (facts.IsUnreachable (entryAfterRequires)) {
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proofResults.Add ("Method precondition is unsatisfiable");
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return;
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}
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object assertStats;
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foreach (AssertionObligation obl in GetAssertions (driver, out assertStats)) {
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FlatDomain<bool> outcome = facts.IsTrue (obl.Apc, BoxedExpression.For (driver.ContextProvider.ExpressionContext.Refine (obl.Apc, obl.Condition), driver.ExpressionDecoder));
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string pc = obl.Apc.ToString ();
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if (outcome.IsNormal ())
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proofResults.Add (string.Format ("Assertion at point {0} is {1}", pc, outcome.IsTrue () ? "true" : "false"));
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else if (outcome.IsTop)
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proofResults.Add ("Assertion at point " + pc + " is unproven");
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else
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proofResults.Add("Assertion at point " + pc + " is unreachable");
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}
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}
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private static IEnumerable<AssertionObligation> GetAssertions (IMethodDriver<TExpression, TVariable> driver, out object assertStats)
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{
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var analysis = new AssertionCrawlerAnalysis ();
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List<AssertionObligation> obligations = analysis.Gather (driver);
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assertStats = null;
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return obligations;
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}
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#region Nested type: AssertionCrawlerAnalysis
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private class AssertionCrawlerAnalysis : ValueCodeVisitor<TVariable> {
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private readonly List<AssertionObligation> Obligations = new List<AssertionObligation> ();
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public List<AssertionObligation> Gather (IMethodDriver<TExpression, TVariable> driver)
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{
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Run (driver.ValueLayer);
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return this.Obligations;
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}
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public override bool Assert (APC pc, EdgeTag tag, TVariable condition, bool data)
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{
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if (pc.InsideRequiresAtCallInsideContract)
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return data;
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this.Obligations.Add (new AssertionObligation (pc, tag, condition));
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return data;
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}
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public override bool Assume (APC pc, EdgeTag tag, TVariable condition, bool data)
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{
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if (!pc.InsideRequiresAtCallInsideContract && tag == EdgeTag.Assume)
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this.Obligations.Add (new AssertionObligation (pc, tag, condition, true));
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return data;
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}
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}
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#endregion
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#region Nested type: AssertionObligation
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private class AssertionObligation {
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public readonly APC Apc;
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public readonly TVariable Condition;
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public readonly bool IsAssume;
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public readonly EdgeTag Tag;
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public AssertionObligation (APC pc, EdgeTag tag, TVariable cond)
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: this (pc, tag, cond, false)
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{
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}
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public AssertionObligation (APC pc, EdgeTag tag, TVariable cond, bool isAssume)
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{
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this.Apc = pc;
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this.Tag = tag;
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this.Condition = cond;
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this.IsAssume = isAssume;
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}
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}
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#endregion
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}
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#endregion
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}
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}
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