private bool ExtractFromClump(StatementList contractClump, Method method, GatherLocals gatherLocals, RequiresList Preconditions, EnsuresList Postconditions, RequiresList validations, EnsuresList modelPostconditions, SourceContext defaultContext, Method originalMethod, Block contractInitializer, ref HelperMethods.StackDepthTracker dupStackTracker) { // set the state so that the contract clump is used for extraction (as opposed to the method body as it used to) StatementList stmts = contractClump; int beginning = 0; int n = stmts.Count; int seginning = HelperMethods.FindNextRealStatement(((Block) stmts[beginning]).Statements, 0); bool endContractFound = false; bool postConditionFound = false; SourceContext currentSourceContext; for (int i = beginning; i < n; i++) { Block b = (Block) stmts[i]; if (b == null) continue; for (int j = 0, m = b.Statements == null ? 0 : b.Statements.Count; j < m; j++) { if (dupStackTracker.IsValid && dupStackTracker.Depth >= 0) { b.Statements[j] = dupStackTracker.Visit(b.Statements[j]); } Statement s = b.Statements[j]; if (s == null) continue; Block currentClump; Throw t = null; t = s as Throw; Method calledMethod = HelperMethods.IsMethodCall(s); if ((t != null || (calledMethod != null && calledMethod.DeclaringType != null && calledMethod.DeclaringType != this.contractNodes.ContractClass && HelperMethods.IsVoidType(calledMethod.ReturnType) && !this.contractNodes.IsContractOrValidatorOrAbbreviatorMethod(calledMethod)))) { // Treat throw statements as (part of) a precondition // don't accept "throw ..." unless it comes in the "precondition section" // then treat the current clump as a precondition, but need to massage it a bit: // all branches to the block just after the throw should be modified to be branches to // a new manufactured block that sets a fresh local to "true". The // throw itself should be changed to set the same local to "false". That way the // clump can be treated as the value of precondition (because the branch polarity has // already been negated as part of the code gen). // This test was supposed to be a sanity check that the current block contained // only "throw ..." or else "nop; throw ...". But I've also seen "ThrowHelper.Throw(...); nop", // so I'm just going to comment this out for now. //if (!((m == 1 && j == 0) || (m == 2 && j == 1))) { // Preconditions = new RequiresList(); // Postconditions = new EnsuresList(); // return; // throw new ExtractorException(); //} Expression exception; // The clump being extracted may contain code/blocks that represent (part of) // the expression that is being thrown (if the original throw expression had // control flow in it from boolean expressions and/or ternary expressions). b.Statements[j] = null; // wipe out throw statement currentClump = new Block(HelperMethods.ExtractClump(stmts, beginning, seginning, i, j)); int currentClumpLength = i - beginning + 1; // there better be a next block because that must have been the target for all of the branches // that didn't cause the throw to happen if (!(i < n - 1)) { this.HandleError(method, 1027, "Malformed contract.", s.SourceContext); return false; } Block nextBlock = (Block) stmts[i + 1]; // cast succeeds because body is clump Local valueOfPrecondition = new Local(Identifier.For("_preConditionHolds"), SystemTypes.Boolean); Block preconditionHolds = new Block(new StatementList(new AssignmentStatement(valueOfPrecondition, Literal.True))); ReplaceBranchTarget rbt = new ReplaceBranchTarget(nextBlock, preconditionHolds); rbt.VisitBlock(currentClump); int ILOffset; CountPopExpressions cpe = new CountPopExpressions(); currentSourceContext = s.SourceContext; cpe.Visit(s); if (0 < cpe.PopOccurrences) { // then there is a set of blocks that represent the exception: the Reader // was not able to decompile it back into an expression. Extract the set // from the current clump and make it into a block expression // Find the last block that has a branch to "preconditionHolds". After that are all of the blocks // that represent the evaluation of the exception int branchBlockIndex = currentClumpLength - 2; // can't be the current block: that has the throw in it while (0 <= branchBlockIndex) { Block possibleBranchBlock = currentClump.Statements[branchBlockIndex] as Block; Branch br = possibleBranchBlock.Statements[possibleBranchBlock.Statements.Count - 1] as Branch; if (br != null && br.Target == preconditionHolds) { break; } branchBlockIndex--; } if (branchBlockIndex < 0) { this.HandleError(method, 1028, "Malformed exception constructor in contract.", defaultContext); return false; } Block exceptionBlock = new Block(HelperMethods.ExtractClump(currentClump.Statements, branchBlockIndex + 1, 0, currentClumpLength - 1, ((Block) currentClump.Statements[currentClumpLength - 1]).Statements.Count - 1)); exceptionBlock.Statements.Add(new ExpressionStatement(t.Expression)); SourceContext sctx = ((Block) exceptionBlock.Statements[0]).Statements[0].SourceContext; if (sctx.IsValid) { currentSourceContext = sctx; } else { SourceContext tmp; bool foundContext = HelperMethods.GetLastSourceContext(exceptionBlock.Statements, out tmp); if (foundContext) currentSourceContext = tmp; } if (!CheckClump(method, gatherLocals, currentSourceContext, exceptionBlock)) return false; exception = new BlockExpression(exceptionBlock, SystemTypes.Exception); ILOffset = t.ILOffset; } else { currentSourceContext = s.SourceContext; if (t != null) { // then the statement is "throw ..." exception = t.Expression; ILOffset = t.ILOffset; } else { ExpressionStatement throwHelperCall = s as ExpressionStatement; Debug.Assert(throwHelperCall != null); exception = throwHelperCall.Expression; ILOffset = s.ILOffset; } exception.SourceContext = currentSourceContext; SourceContext tmp; bool foundContext = HelperMethods.GetLastSourceContext(currentClump.Statements, out tmp); if (foundContext) currentSourceContext = tmp; } Block returnValueOfPrecondition = new Block(new StatementList(new ExpressionStatement(valueOfPrecondition))); Statement extraAssumeFalse = this.ExtraAssumeFalseOnThrow(); Block preconditionFails = new Block(new StatementList(new AssignmentStatement(valueOfPrecondition, Literal.False), extraAssumeFalse, new Branch(null, returnValueOfPrecondition, true, false, false))); //Block preconditionFails = new Block(new StatementList(new AssignmentStatement(valueOfPrecondition, Literal.False), new Branch(null, returnValueOfPrecondition, true, false, false))); currentClump.Statements.Add(preconditionFails); // replace throw statement currentClump.Statements.Add(preconditionHolds); currentClump.Statements.Add(returnValueOfPrecondition); if (!CheckClump(originalMethod, gatherLocals, currentSourceContext, currentClump)) return false; BlockExpression be = new BlockExpression(currentClump, SystemTypes.Boolean); be.SourceContext = currentSourceContext; var ro = new RequiresOtherwise(be, exception); ro.ILOffset = ILOffset; ro.SourceContext = currentSourceContext; if (postConditionFound) { HandleError(originalMethod, 1013, "Precondition found after postcondition.", currentSourceContext); return false; } validations.Add(ro); var req = new RequiresPlain(be, FindExceptionThrown.Find(exception)); req.IsFromValidation = true; req.ILOffset = ro.ILOffset; req.SourceContext = ro.SourceContext; Preconditions.Add(req); } else { if (contractNodes.IsContractMethod(calledMethod)) { // Treat calls to contract methods if (endContractFound) { HandleError(originalMethod, 1012, "Contract call found after prior EndContractBlock.", s.SourceContext); break; } if (contractNodes.IsEndContract(calledMethod)) { endContractFound = true; continue; } MethodCall mc = ((ExpressionStatement) s).Expression as MethodCall; Expression arg = mc.Operands[0]; arg.SourceContext = s.SourceContext; MethodContractElement mce; currentSourceContext = s.SourceContext; Expression condition; if (beginning == i && seginning == j) { // Deal with the simple case: the reader decompiled the call into a single statement condition = arg; } else { b.Statements[j] = new ExpressionStatement(arg); // construct a clump from // methodBody.Statements[beginning].Statements[seginning] to // methodBody.Statements[i].Statements[j] currentClump = new Block(HelperMethods.ExtractClump(stmts, beginning, seginning, i, j)); if (!currentSourceContext.IsValid) { // then a good source context has not been found yet. Grovel around in the clump // to see if there is a better one SourceContext sctx; if (HelperMethods.FindContext(currentClump, currentSourceContext, out sctx)) currentSourceContext = sctx; } if (!CheckClump(originalMethod, gatherLocals, currentSourceContext, currentClump)) return false; BlockExpression be = new BlockExpression(currentClump); condition = be; } condition.SourceContext = currentSourceContext; if (contractNodes.IsPlainPrecondition(calledMethod)) { var req = new RequiresPlain(condition); contractNodes.IsRequiresWithException(calledMethod, out req.ExceptionType); mce = req; } else if (this.contractNodes.IsPostcondition(calledMethod)) { mce = new EnsuresNormal(condition); } else if (contractNodes.IsExceptionalPostcondition(calledMethod)) { EnsuresExceptional ee = new EnsuresExceptional(condition); // Extract the type of exception. ee.Type = calledMethod.TemplateArguments[0]; mce = ee; } else { throw new InvalidOperationException("Cannot recognize contract method"); } mce.SourceContext = currentSourceContext; mce.ILOffset = mc.ILOffset; if (1 < mc.Operands.Count) { var candidate = SanitizeUserMessage(method, mc.Operands[1], currentSourceContext); mce.UserMessage = candidate; } if (2 < mc.Operands.Count) { Literal lit = mc.Operands[2] as Literal; if (lit != null) { mce.SourceConditionText = lit; } } // determine Model status mce.UsesModels = CodeInspector.UsesModel(mce.Assertion, this.contractNodes); // Check context rules switch (mce.NodeType) { case NodeType.RequiresPlain: if (postConditionFound) { this.HandleError(originalMethod, 1014, "Precondition found after postcondition.", currentSourceContext); return false; } if (mce.UsesModels) { this.HandleError(originalMethod, 1073, "Preconditions may not refer to model members.", currentSourceContext); return false; } var rp = (RequiresPlain) mce; Preconditions.Add(rp); validations.Add(rp); // also add to the internal validation list break; // TODO: check visibility of post conditions based on visibility of possible implementation case NodeType.EnsuresNormal: case NodeType.EnsuresExceptional: Ensures ensures = (Ensures) mce; if (mce.UsesModels) { if (this.IncludeModels) { modelPostconditions.Add(ensures); } } else { Postconditions.Add(ensures); } postConditionFound = true; break; } } else if (ContractNodes.IsValidatorMethod(calledMethod)) { // Treat calls to Contract validators if (endContractFound) { this.HandleError(originalMethod, 1012, "Contract call found after prior EndContractBlock.", s.SourceContext); break; } MethodCall mc = ((ExpressionStatement) s).Expression as MethodCall; var memberBinding = (MemberBinding) mc.Callee; currentSourceContext = s.SourceContext; Statement validation; Block validationPrefix; if (beginning == i && seginning == j) { // Deal with the simple case: the reader decompiled the call into a single statement validation = s; validationPrefix = null; } else { // The clump may contain multiple statements ending in the validator call. // to extract the code as Requires<E>, we need to keep the statements preceeding // the validator call, as they may contain local initialization etc. These should go // into the first Requires<E> that the validator expands to. This way, if there are // no Requires<E> expanded from the validator, then the statements can be omitted. // At the same time, the statements won't be duplicated when validations are emitted. // // If the validator call contains any pops, then the extraction must fail saying it // is too complicated. // must null out statement with call before extract clump b.Statements[j] = null; // we have a copy in mc, s validationPrefix = new Block(HelperMethods.ExtractClump(stmts, beginning, seginning, i, j)); if (!currentSourceContext.IsValid) { // then a good source context has not been found yet. Grovel around in the clump // to see if there is a better one SourceContext sctx; if (HelperMethods.FindContext(validationPrefix, currentSourceContext, out sctx)) currentSourceContext = sctx; } if (CountPopExpressions.Count(mc) > 0) { this.HandleError(method, 1071, "Arguments to contract validator call are too complicated. Please simplify.", currentSourceContext); return false; } if (!CheckClump(originalMethod, gatherLocals, currentSourceContext, validationPrefix)) return false; validation = new Block(new StatementList(validationPrefix, s)); validation.SourceContext = currentSourceContext; } var ro = new RequiresOtherwise(null, new BlockExpression(new Block(new StatementList(validation)))); validations.Add(ro); CopyValidatorContracts( method, calledMethod, memberBinding.TargetObject, mc.Operands, Preconditions, currentSourceContext, validationPrefix); } else if (ContractNodes.IsAbbreviatorMethod(calledMethod)) { // Treat calls to Contract abbreviators if (endContractFound) { this.HandleError(originalMethod, 1012, "Contract call found after prior EndContractBlock.", s.SourceContext); break; } MethodCall mc = ((ExpressionStatement) s).Expression as MethodCall; var memberBinding = (MemberBinding) mc.Callee; currentSourceContext = s.SourceContext; if (beginning == i && seginning == j) { // Deal with the simple case: the reader decompiled the call into a single statement // nothing to do. All is in the call and its arguments } else { // The clump may contain multiple statements ending in the abbreviator call. // We need to keep the statements preceeding the abbreviator call and add them to the // contract initializer block. The reason we cannot add them to the first expansion contract // of the abbreviator is that the abbreviator may give rise to closure initialization which will // be hoisted into the closure initializer block. This closure initializer may refer to the // locals initialized by the present statement sequence, so it must precede it. // // If the abbreviator call contains any pops, then the extraction must fail saying it // is too complicated. // grab prefix of clump minus last call statement. // must null out current call statement before we extract clump (ow. it stays in body) b.Statements[j] = null; currentClump = new Block(HelperMethods.ExtractClump(stmts, beginning, seginning, i, j)); if (!currentSourceContext.IsValid) { // then a good source context has not been found yet. Grovel around in the clump // to see if there is a better one SourceContext sctx; if (HelperMethods.FindContext(currentClump, currentSourceContext, out sctx)) currentSourceContext = sctx; } if (CountPopExpressions.Count(mc) > 0) { this.HandleError(method, 1070, "Arguments to contract abbreviator call are too complicated. Please simplify.", currentSourceContext); return false; } if (!CheckClump(originalMethod, gatherLocals, currentSourceContext, currentClump)) return false; if (HelperMethods.IsNonTrivial(currentClump)) { contractInitializer.Statements.Add(currentClump); } } CopyAbbreviatorContracts(method, calledMethod, memberBinding.TargetObject, mc.Operands, Preconditions, Postconditions, currentSourceContext, validations, contractInitializer); } else { // important to continue here and accumulate blocks/statements for next contract! if (i == beginning && j == seginning && s.NodeType == NodeType.Nop) { // nop following contract is often associated with previous code, so skip it seginning = j + 1; } continue; } } // Re-initialize current state after contract has been found beginning = i; seginning = j + 1; //seginning = HelperMethods.FindNextRealStatement(((Block)stmts[i]).Statements, j + 1); if (seginning < 0) seginning = 0; //b = (Block)stmts[i]; // IMPORTANT! Need this to keep "b" in sync } } if (this.verbose) { Console.WriteLine("\tNumber of Preconditions: " + Preconditions.Count); Console.WriteLine("\tNumber of Postconditions: " + Postconditions.Count); } return true; }
private StatementList GetContractClumpFromMoveNext(Method iteratorMethod, Method moveNext, ContractNodes contractNodes, StatementList contractInitializer, out SourceContext defaultSourceContext, ref HelperMethods.StackDepthTracker dupStackTracker, out AssumeBlock originalContractPosition) { Contract.Requires(moveNext != null); Contract.Requires(moveNext.Body != null); Contract.Requires(moveNext.Body.Statements != null); Contract.Requires(contractInitializer != null); Contract.Requires(iteratorMethod != null); var linkerVersion = 0; if (iteratorMethod.DeclaringType != null && iteratorMethod.DeclaringType.DeclaringModule != null) { linkerVersion = iteratorMethod.DeclaringType.DeclaringModule.LinkerMajorVersion; } var initialState = moveNext.IsAsync ? -1 : 0; moveNext.MoveNextStartState = initialState; originalContractPosition = null; int statementIndex; Contract.Assume(moveNext.Body != null); Contract.Assume(moveNext.Body.Statements != null); int blockIndex = ContractStartInMoveNext(this.contractNodes, moveNext, out statementIndex, iteratorMethod); Contract.Assert(statementIndex >= 0, "should follow from the postcondiiton"); if (blockIndex < 0) { // Couldn't find state 0 in MoveNext method // This can happen if the iterator is trivial (like yield break; ) defaultSourceContext = default(SourceContext); return null; } int beginning = blockIndex; // the block number in the body of movenext int sbeginning = statementIndex; // the statement no. in the beginnning block after the preamble int blast = -1; // the block number in the body of movenext, of the last block where there is a contract call int slast = -1; // the statement no. in the blast block // Next we move sbeginning past the preamble area sbeginning = MovePastPreamble(iteratorMethod, moveNext, beginning, sbeginning, contractInitializer, contractNodes, ref dupStackTracker); Contract.Assert(moveNext.Body != null, "should be provable"); Contract.Assert(moveNext.Body.Statements != null, "should be provable"); if (sbeginning < 0 || !this.FindLastBlockWithContracts(moveNext.Body.Statements, beginning, out blast, out slast)) { if (verbose) { if (moveNext.Name != null) { Console.WriteLine("Method {0} doesnt have a contract method invocation at the right place.", moveNext.Name.Name); } } defaultSourceContext = default(SourceContext); return null; } Block methodBody = moveNext.Body; Block lastBlock = methodBody.Statements[blast] as Block; SourceContext lastContractSourceContext; if (lastBlock != null) { lastContractSourceContext = lastBlock.SourceContext; // probably not a good context, what to do if one can't be found? if (lastBlock.Statements != null && 0 <= slast && slast < lastBlock.Statements.Count) { if (lastBlock.Statements[slast] != null) { lastContractSourceContext = lastBlock.Statements[slast].SourceContext; } } } else { lastContractSourceContext = default(SourceContext); } // TODO: check the clump is not in a try-catch block. originalContractPosition = new AssumeBlock(new StatementList()); StatementList result = HelperMethods.ExtractClump( moveNext.Body.Statements, beginning, sbeginning, blast, slast, assumeBlock: originalContractPosition); defaultSourceContext = lastContractSourceContext; return result; }
private static int MovePastPreamble([Pure] Method iteratorMethod, [Pure] Method moveNext, int beginning, int currentIndex, StatementList contractInitializer, ContractNodes contractNodes, ref HelperMethods.StackDepthTracker dupStackTracker) { Contract.Requires(moveNext != null); Contract.Requires(moveNext.Body != null); Contract.Requires(moveNext.Body.Statements != null); Contract.Requires(beginning >= 0); Contract.Requires(beginning < moveNext.Body.Statements.Count); Contract.Requires(currentIndex >= 0); Contract.Requires(contractInitializer != null); var state0Block = moveNext.Body.Statements[beginning] as Block; while (state0Block == null && beginning + 1 < moveNext.Body.Statements.Count) { state0Block = moveNext.Body.Statements[++beginning] as Block; if (state0Block != null && (state0Block.Statements == null || state0Block.Statements.Count == 0)) { // skip empty blocks state0Block = null; } } if (state0Block == null) return -1; if (state0Block.Statements == null) return -1; #if true TypeNode closureType; currentIndex = HelperMethods.MovePastClosureInit(iteratorMethod, state0Block, contractNodes, contractInitializer, null, currentIndex, ref dupStackTracker, out closureType); #else int indexForClosureCreationStatement = currentIndex; TypeNode closureType = null; while (indexForClosureCreationStatement < state0Block.Statements.Count) { closureType = HelperMethods.IsClosureCreation(iteratorMethod, state0Block.Statements[indexForClosureCreationStatement]); if (closureType != null) { break; } indexForClosureCreationStatement++; } if (closureType != null && indexForClosureCreationStatement < state0Block.Statements.Count) { // then there is a set of statements to add to the preamble block // up to and including "this.<>local := new ClosureClass();" for (int i = currentIndex; i <= indexForClosureCreationStatement; i++) { // preambleBlock.Statements.Add(state0Block.Statements[i]); if (state0Block.Statements[i] == null) continue; contractInitializer.Add((Statement)state0Block.Statements[i].Clone()); // state0Block.Statements[i] = null; } // Some number of assignment statements of the form "this.local.f := f;" where "f" is a parameter // Or of the form local.f := f; // that is captured by the closure. int endOfAssignmentsToClosureFields = indexForClosureCreationStatement + 1; for (; endOfAssignmentsToClosureFields < state0Block.Statements.Count; endOfAssignmentsToClosureFields++) { Statement s = state0Block.Statements[endOfAssignmentsToClosureFields]; if (s == null) continue; if (s.NodeType == NodeType.Nop) continue; AssignmentStatement assign = s as AssignmentStatement; if (assign == null) break; MemberBinding mb = assign.Target as MemberBinding; if (mb == null) break; if (mb.TargetObject == null) break; if (mb.TargetObject.Type != closureType) break; } for (int i = indexForClosureCreationStatement + 1; i < endOfAssignmentsToClosureFields; i++) { // preambleBlock.Statements.Add(state0Block.Statements[i]); if (state0Block.Statements[i] == null) continue; contractInitializer.Add((Statement)state0Block.Statements[i].Clone()); // state0Block.Statements[i] = null; // need to null them out so search below can be done starting at beginning of m's body } currentIndex = endOfAssignmentsToClosureFields; } #endif return currentIndex; }
// Ensures: // Preconditions != null // && ForAll{Requires r in Preconditions; // r.Condition is BlockExpression // && r.Condition.Type == Void // && IsClump(r.Condition.Block.Statements) // Postconditions != null // && ForAll{Ensures e in Posconditions; // e.PostCondition is BlockExpression // && e.PostCondition.Type == Void // && IsClump(e.PostCondition.Block.Statements) // (In addition, each Requires is a RequiresPlain when the contract // call is Contract.Requires and is a RequiresOtherwise when the // contract call is Critical.Requires. In the latter case, the // ThrowException is filled in correctly.) // /// <summary> /// /// </summary> /// <param name="method"></param> /// <param name="Preconditions"></param> /// <param name="Postconditions"></param> /// <param name="Validations"></param> /// <param name="contractInitializerBlock">used to store extra closure initializations from abbrevs and validators</param> public void CheapAndDirty( Method method, ref RequiresList Preconditions, ref EnsuresList Postconditions, ref RequiresList Validations, ref EnsuresList modelPostConditions, Block contractInitializerBlock, ref HelperMethods.StackDepthTracker dupStackTracker) { if (this.verbose) { Console.WriteLine("Method : " + method.FullName); } if (method == null || method.Body == null || method.Body.Statements == null || method.Body.Statements.Count <= 0) { return; } Block methodBody = method.Body; int n = methodBody.Statements.Count; int beginning = 0; while (beginning < n && methodBody.Statements[beginning] is PreambleBlock) { beginning++; } int lastBlockContainingContract; int lastStatementContainingContract; bool anyContractCall = FindLastBlockWithContracts(methodBody.Statements, beginning, out lastBlockContainingContract, out lastStatementContainingContract); // Make sure any locals in the contracts are disjoint from the locals in the rest of the body // can use the same one throughout GatherLocals gatherLocals = new GatherLocals(); SourceContext lastContractSourceContext = method.SourceContext; if (!anyContractCall) { if (this.verbose) { Console.WriteLine("\tNo contracts found"); } // still need to check for bad other contract calls in method body goto CheckBody; } Block lastBlock = methodBody.Statements[lastBlockContainingContract] as Block; lastContractSourceContext = lastBlock.SourceContext; // probably not a good context, what to do if one can't be found? if (lastBlock.Statements != null && 0 <= lastStatementContainingContract && lastStatementContainingContract < lastBlock.Statements.Count) { lastContractSourceContext = lastBlock.Statements[lastStatementContainingContract].SourceContext; } // Make sure contract section is not in any try-catch region TrivialHashtable<int> block2Index = new TrivialHashtable<int>(methodBody.Statements.Count); for (int i = 0, nn = methodBody.Statements.Count; i < nn; i++) { if (methodBody.Statements[i] == null) continue; block2Index[methodBody.Statements[i].UniqueKey] = i; } // Check each exception handler and see if any overlap with the contract section for (int i = 0, nn = method.ExceptionHandlers == null ? 0 : method.ExceptionHandlers.Count; i < nn; i++) { ExceptionHandler eh = method.ExceptionHandlers[i]; if (eh == null) continue; if (((int) block2Index[eh.BlockAfterTryEnd.UniqueKey]) < beginning || lastBlockContainingContract < ((int) block2Index[eh.TryStartBlock.UniqueKey])) { continue; // can't overlap } this.HandleError(method, 1024, "Contract section within try block.", lastContractSourceContext); return; } // Extract <beginning,0> to <lastBlockContainingContract,lastStatmentContainingContract> StatementList contractClump = HelperMethods.ExtractClump(methodBody.Statements, beginning, 0, lastBlockContainingContract, lastStatementContainingContract); // Look for bad stuff BadStuff(method, contractClump, lastContractSourceContext); // Make sure that the entire contract section is closed. if (!CheckClump(method, gatherLocals, currentMethodSourceContext, new Block(contractClump))) { return; } // Checking that had the side effect of populating the hashtable, but now each contract will be individually visited. // That process needs to start with a fresh table. gatherLocals.Locals = new TrivialHashtable(); Preconditions = new RequiresList(); Postconditions = new EnsuresList(); Validations = new RequiresList(); modelPostConditions = new EnsuresList(); if (!ExtractFromClump( contractClump, method, gatherLocals, Preconditions, Postconditions, Validations, modelPostConditions, lastContractSourceContext, method, contractInitializerBlock, ref dupStackTracker)) { return; } CheckBody: // Check "real" method body for use of any locals used in contracts // var checkMethodBody = new CheckForBadContractStuffInMethodBody(gatherLocals, this.CallErrorFound, method); var checkMethodBody = new CheckLocals(gatherLocals); checkMethodBody.Visit(methodBody); if (!this.fSharp && checkMethodBody.reUseOfExistingLocal != null) { SourceContext sc = lastContractSourceContext; this.HandleError(method, 1025, "After contract block, found use of local variable '" + checkMethodBody.reUseOfExistingLocal.Name.Name + "' defined in contract block", sc); } }