public static Boolean IsCurrentlyMissing(IMethodReference methodReference)
{
// The value of this condition can change throughout the execution of the translation.
// For that reason, it should be called at the end of the translation again to confirm
// the method is actually missing from the binary.
return(!methodsTranslated.Contains(BoogieMethod.From(methodReference).Name));
}
public static void CreateAsyncStartMethod(StreamWriter sw)
{
StatementList stmts = new StatementList();
var boogieGetTypeRes = BoogieVariable.GetTempVar(Helpers.ObjectType(), null /* need dict with used var names*/, prefix: "asyncType");
var stateMachineVar = BoogieVariable.GetTempVar(Helpers.ObjectType(), null /* need dict with used var names*/, prefix: "stateMachineCopy");
stmts.Add(BoogieStatement.VariableDeclaration(stateMachineVar));
stmts.Add(BoogieStatement.VariableDeclaration(boogieGetTypeRes));
stmts.Add(BoogieStatement.FromString($"{stateMachineVar.Expr} := stateMachine;"));
foreach (var asyncMethod in Helpers.asyncMoveNexts)
{
var asyncType = asyncMethod.ContainingTypeDefinition;
var bg = BoogieGenerator.Instance();
stmts.Add(bg.ProcedureCall(BoogieMethod.GetTypeMethod, new List <Expression> {
stateMachineVar
}, boogieGetTypeRes));
StatementList ifStmts = new StatementList();
ifStmts.Add(BoogieGenerator.Instance().ProcedureCall(BoogieMethod.From(asyncMethod), new List <Expression> {
stateMachineVar
}));
stmts.Add(BoogieStatement.If(Expression.Subtype(boogieGetTypeRes, asyncType), ifStmts));
}
stmts.Add(BoogieStatement.FromString($"v0$out := {stateMachineVar.Expr};"));
sw.WriteLine(@"procedure {:extern} System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1.Start``1$``0$(this : Ref,stateMachine : Ref) returns (v0$out : Ref) {");
foreach (var stmt in stmts)
{
sw.WriteLine(stmt.Stmt);
}
sw.WriteLine("}");
}
public static string CreateInitializeGlobals()
{
StringBuilder sb
= new StringBuilder();
sb.AppendLine("procedure {:ProgramInitialization} $initialize_globals()");
sb.AppendLine("{");
sb.AppendLine("\t//this procedure initializes global exception variables and calls static constructors");
sb.AppendLine("\t$Exception := null;");
sb.AppendLine("\t$ExceptionType := null;");
sb.AppendLine("\t$ExceptionInCatchHandler := null;");
sb.AppendLine("\t$ExceptionInCatchHandlerType := null;");
foreach (var staticConstructor in staticConstructors)
{
var signature = BoogieMethod.From(staticConstructor).Name;
sb.AppendLine(String.Format("\tcall {0}();", signature));
sb.AppendLine("\tif ($Exception != null)");
sb.AppendLine("\t{");
sb.AppendLine("\t\treturn;");
sb.AppendLine("\t}");
}
sb.AppendLine("}");
return(sb.ToString());
}
public static string CreateMainWrappers()
{
StringBuilder sb
= new StringBuilder();
foreach (var mainMethodTuple in mainMethods)
{
var mainMethod = mainMethodTuple.Item1;
var assembly = mainMethodTuple.Item2;
var disassembler = new Disassembler(assembly.Host, mainMethod, assembly.PdbReader);
disassembler.Execute();
var methodName = BoogieMethod.From(mainMethod).Name;
var parameters = Helpers.GetParametersWithBoogieType(disassembler.MethodBody.Parameters);
var returnType = Helpers.GetMethodBoogieReturnType(mainMethod).Equals(Helpers.BoogieType.Void) ? String.Empty : ("returns ($result :" + Helpers.GetMethodBoogieReturnType(mainMethod) + ")");
sb.AppendLine(String.Format("procedure {{:entrypoint}} $Main_Wrapper_{0}({1}) {2}", methodName, parameters, returnType));
sb.AppendLine("{");
var variables = String.Empty;
IMethodDefinition methodDef = mainMethod as IMethodDefinition;
if (methodDef != null)
{
variables = String.Join(",", methodDef.Parameters.Select(v => v.Name));
}
else
{
variables = String.Join(",", mainMethod.Parameters.Select(v => String.Format("param{0}", v.Index)));
}
if (mainMethod.CallingConvention.HasFlag(Microsoft.Cci.CallingConvention.HasThis))
{
variables = String.Format("this", mainMethod.ParameterCount > 0 ? "," : String.Empty, parameters);
}
variables = Helpers.Strings.NormalizeStringForCorral(variables);
sb.AppendLine("\tcall $allocate_static_fields();");
sb.AppendLine("\tcall $default_values_static_fields();");
sb.AppendLine("\tcall $initialize_globals();");
sb.AppendLine("\tcall $call_static_constructors();");
if (String.IsNullOrEmpty(returnType))
{
sb.AppendLine(String.Format("\tcall {0}({1});", methodName, variables));
}
else
{
sb.AppendLine(String.Format("\tcall $result := {0}({1});", methodName, variables));
}
sb.AppendLine("\tif ($Exception != null)");
sb.AppendLine("\t{");
sb.AppendLine("\t\treturn;");
sb.AppendLine("\t}");
sb.AppendLine("}");
}
return(sb.ToString());
}
public StatementList CallStringProcedure(BoogieMethod method, IVariable op1, IInmediateValue op2, BoogieVariable boogieVariable)
{
Contract.Assert(!(op2 is Constant c) || c.Value == null);
var arg1 = BoogieGenerator.Instance().ReadAddr(op1);
Expression arg2 = null;
if (op2 is Constant constant && constant.Value == null)
{
arg2 = BoogieGenerator.Instance().NullObject();
}
public static String GetExternalMethodDefinition(IMethodReference methodRef)
{
var methodName = BoogieMethod.From(methodRef).Name;
if (Helpers.IsCurrentlyMissing(methodRef))
{
// TODO(rcastano): Add logger. Print this as INFO or WARNING level.
Console.WriteLine("WARNING: Creating non-deterministic definition for missing method: " + methodName);
}
var parameters = Helpers.GetParametersWithBoogieType(methodRef);
var returnType = String.Empty;
if (Settings.NewAddrModelling)
{
#region Return variables in NewAddrModelling. We should only add the return variable type from CCI
if (Helpers.GetMethodBoogieReturnType(methodRef).Equals(Helpers.BoogieType.Void))
{
returnType = "returns ()";
}
else
{
var returnVariables = new List <String>();
returnVariables.Add(String.Format("$result : {0}", Helpers.GetMethodBoogieReturnType(methodRef)));
returnType = String.Format("returns ({0})", String.Join(",", returnVariables));
}
#endregion
}
else
{
#region Return variables in old memory model. We need to add 'ref' parameters as return variables (in addition to the return variable from CCI).
if (Helpers.GetMethodBoogieReturnType(methodRef).Equals(Helpers.BoogieType.Void))
{
if (methodRef.Parameters.Any(p => p.IsByReference))
{
var returnVariables = new List <String>();
returnVariables = methodRef.Parameters.Where(p => p.IsByReference).Select(p => String.Format("v{0}$out : {1}", p.Index, Helpers.GetBoogieType(p))).ToList();
returnType = String.Format("returns ({0})", String.Join(",", returnVariables));
}
}
else
{
var returnVariables = new List <String>();
returnVariables = methodRef.Parameters.Where(p => p.IsByReference).Select(p => String.Format("v{0}$out : {1}", p.Index, Helpers.GetBoogieType(p))).ToList();
returnVariables.Add(String.Format("$result : {0}", Helpers.GetMethodBoogieReturnType(methodRef)));
returnType = String.Format("returns ({0})", String.Join(",", returnVariables));
}
#endregion
}
var t = new BoogieProcedureTemplate(methodName, " {:extern} ", StatementList.Empty, StatementList.Empty, parameters, returnType, true);
return(t.TransformText());
}
public static BoogieMethod GetBinaryMethod(BranchOperation op)
{
BoogieMethod method = null;
switch (op)
{
case BranchOperation.Eq: method = BoogieMethod.StringEquality; break;
case BranchOperation.Neq: method = BoogieMethod.StringInequality; break;
}
Contract.Assert(method != null);
return(method);
}
public string GetProcedureStub(IMethodReference method)
{
FieldTranslator field = new FieldTranslator();
var boogieName = field.BoogieNameForField(method.ContainingType, GetFieldName(method));
var boogieType = Helpers.GetBoogieType(method.Type);
var get = new StatementList();
get.Add(BoogieStatement.FromString("$result := " + boogieName + "[obj];"));
var t = new BoogieProcedureTemplate(BoogieMethod.From(method).Name, "", StatementList.Empty, get, "obj : Ref", String.Format(" returns ( $result : {0})", boogieType.ToString()), false);
return(t.TransformText());
}
public string SetProcedureStub(IMethodReference method)
{
FieldTranslator field = new FieldTranslator();
var boogieName = field.BoogieNameForField(method.ContainingType, GetFieldName(method));
var paramType = Helpers.GetBoogieType(method.Parameters.ElementAt(0));
var get = new StatementList();
get.Add(BoogieStatement.FromString(boogieName + "[obj] := " + "val;"));
var t = new BoogieProcedureTemplate(BoogieMethod.From(method).Name, "", StatementList.Empty, get, "obj : Ref, val : " + paramType, String.Empty, false);
return(t.TransformText());
}
public String Translate()
{
// instructions must be translated before local variables
// modification to local variables can ocurr while instruction translation is done
// for example when delegate creation is detected some local variables are deleted.
var ins = TranslateInstructions(out Dictionary <string, BoogieVariable> temporalVariables);
var localVariables = TranslateLocalVariables(temporalVariables);
var methodName = BoogieMethod.From(methodDefinition).Name;
var attr = TranslateAttr();
var parametersWithTypes = Helpers.GetParametersWithBoogieType(methodDefinition);
var returnTypeIfAny = TranslateReturnTypeIfAny();
var boogieProcedureTemplate = new BoogieProcedureTemplate(methodName, attr, localVariables, ins, parametersWithTypes, returnTypeIfAny, Helpers.IsExternal(methodDefinition));
return(boogieProcedureTemplate.TransformText());
}
// workaround
public static Boolean IsExternal(IMethodDefinition methodDefinition)
{
if (methodDefinition.IsConstructor)
{
var methodName = BoogieMethod.From(methodDefinition).Name;
if (methodName.Equals("System.Object.#ctor"))
{
return(true);
}
}
if (methodDefinition.IsExternal)
{
return(true);
}
return(false);
}
public static string CreateStaticConstructorsCallsProcedure()
{
StatementList body = new StatementList();
foreach (var staticConstructor in staticConstructors)
{
var ctor = BoogieMethod.From(staticConstructor);
body.Add(BoogieGenerator.Instance().ProcedureCall(ctor, new List <Expression>(), null));
}
string procedureName = "$call_static_constructors";
string attributes = String.Empty;
StatementList localVariables = new StatementList();
String parametersWithTypes = String.Empty;
String returnTypeIfAny = String.Empty;
BoogieProcedureTemplate temp = new BoogieProcedureTemplate(procedureName, attributes, localVariables, body, parametersWithTypes, returnTypeIfAny, false);
return(temp.TransformText());
}
private StatementList Invoke(IMethodDefinition member, BoogieVariable receiver)
{
Expression receiverObject = receiver;
if (receiver.Type.Equals(Helpers.BoogieType.Addr))
{
AddressExpression addrExpr = new AddressExpression(member.ContainingType, receiver);
receiverObject = BoogieGenerator.Instance().ReadAddr(addrExpr);
}
Expression subtype = Expression.Subtype(Expression.DynamicType(receiverObject), member.ContainingType);
StatementList body = new StatementList();
List <Expression> argumentList = new List <Expression>();
argumentList.Add(receiverObject);
body.Add(BoogieGenerator.Instance().ProcedureCall(BoogieMethod.From(member), argumentList));
body.Add(BoogieStatement.ReturnStatement);
var ifExpr = BoogieStatement.If(subtype, body);
return(ifExpr);
}
public static void Start(ProgramOptions programOptions)
{
Console.WriteLine(programOptions);
Settings.SetProgramOptions(programOptions);
var outputPath = SetupOutputFile();
streamWriter.WriteLine(Resource.GetResourceAsString("TinyBCT.Resources.Prelude.bpl"));
if (Settings.AsyncSupport || Settings.AsyncSupportGenerics)
{
streamWriter.WriteLine(Resource.GetResourceAsString("TinyBCT.Resources.CommonAsyncPrelude.bpl"));
}
if (Settings.AsyncSupport)
{
streamWriter.WriteLine(Resource.GetResourceAsString("TinyBCT.Resources.AsyncPrelude.bpl"));
}
if (Settings.AsyncSupportGenerics)
{
streamWriter.WriteLine(Resource.GetResourceAsString("TinyBCT.Resources.AsyncPreludeGeneric.bpl"));
}
using (var host = new PeReader.DefaultHost())
{
#region Load assemblies
ISet <Assembly> inputAssemblies = new HashSet <Assembly>();
foreach (string inputFile in Settings.InputFiles)
{
Assembly assembly = new Assembly(host);
assembly.Load(inputFile);
inputAssemblies.Add(assembly);
}
#endregion
#region Execute CHA
var CHAnalysis = new ClassHierarchyAnalysis(host);
CHAnalysis.Analyze();
#endregion
#region Initialize host types
Types.Initialize(host);
#endregion
// TODO(diegog): Analysis not integrated yet
// This can be used to obtain the allocated types and delegates
//var allocationsAndDelelegatesAnalysis = new TypesAndDelegatesCollector(host);
#region Write three address code for debugging
TACWriter.WriteTAC(inputAssemblies);
#endregion
#region Look for references (used in mixed memory model)
if (Settings.MemoryModel == ProgramOptions.MemoryModelOption.Mixed)
{
ReferenceFinder.TraverseForFields(inputAssemblies);
}
#endregion
#region Translate defined types and add axioms about subtyping
TypeDefinitionTranslator.TranslateTypes(inputAssemblies);
#endregion
#region Translate defined methods
MethodTranslator.TranslateAssemblies(inputAssemblies, CHAnalysis);
#endregion
#region Create main wrapper with static fields initialization and static constructors calls
StaticInitializer.SearchStaticConstructorsAndMain(inputAssemblies);
streamWriter.WriteLine(StaticInitializer.CreateInitializeGlobals());
streamWriter.WriteLine(StaticInitializer.CreateMainWrappers());
streamWriter.WriteLine(StaticInitializer.CreateStaticVariablesAllocProcedure());
streamWriter.WriteLine(StaticInitializer.CreateDefaultValuesStaticVariablesProcedure());
streamWriter.WriteLine(StaticInitializer.CreateStaticConstructorsCallsProcedure());
#endregion
#region Translate types that are referenced but not defined in the input assemblies
TypeDefinitionTranslator.DefineUndeclaredSuperClasses();
TypeDefinitionTranslator.ParametricTypeDeclarations();
#endregion
#region Translate string constants
BoogieLiteral.Strings.WriteStringConsts(streamWriter);
#endregion
#region Translate delegates
streamWriter.WriteLine(DelegateStore.DefineMethodsIdentifiers());
streamWriter.WriteLine(DelegateStore.CreateDelegateMethod());
streamWriter.WriteLine(DelegateStore.InvokeDelegateMethod());
#endregion
// CreateAllAsyncMethods(streamWriter);
#region Heuristic to catch getters & setters. If they are in our input assemblies we generate a body using a field associated to that property
IEnumerable <IMethodReference> usedProperties = new List <IMethodReference>();
if (Settings.StubGettersSetters || Settings.StubGettersSettersWhitelist.Count > 0)
{
GetterSetterStub getterSetterStub = new GetterSetterStub();
usedProperties = getterSetterStub.Stub(inputAssemblies, streamWriter);
}
#endregion
#region Generate stubs for async methods
if (Settings.AsyncSupport)
{
AsyncStubs asyncStubs = new AsyncStubs(inputAssemblies);
streamWriter.WriteLine(asyncStubs.AsyncMethodBuilderStartStub(false));
streamWriter.WriteLine(asyncStubs.AsyncStubsScheduleTask(false));
}
if (Settings.AsyncSupportGenerics)
{
AsyncStubs asyncStubs = new AsyncStubs(inputAssemblies);
streamWriter.WriteLine(asyncStubs.AsyncMethodBuilderStartStub(true));
streamWriter.WriteLine(asyncStubs.AsyncStubsScheduleTask(true));
}
if (!Settings.AsyncSupport && Settings.AsyncSupportGenerics)
{
// this is only in AsyncSupport prelude
// we can't add it to AsyncSupportGenerics because we are not always sure there will be all defined types and functions
bool hasEventually = inputAssemblies.GetAllDefinedMethods().Any(m => m.Name.Value.Equals("Eventually"));
if (hasEventually)
{
AsyncStubs asyncStubs = new AsyncStubs(inputAssemblies);
streamWriter.WriteLine(asyncStubs.EventuallyStub());
}
}
#endregion
streamWriter.WriteLine(StringTranslator.Stubs());
#region Translate called methods as extern (bodyless methods or methods not present in our input assemblies)
var externMethods = InstructionTranslator.CalledMethods.Except(inputAssemblies.GetAllDefinedMethods().Where(m => m.Body.Size > 0)).Except(usedProperties);
externMethods = externMethods.Where(m => !StringTranslator.GetBoogieNamesForStubs().Contains(BoogieMethod.From(m).Name));
foreach (var methodRef in externMethods)
{
var head = Helpers.GetExternalMethodDefinition(Helpers.GetUnspecializedVersion(methodRef));
streamWriter.WriteLine(head);
}
#endregion
#region Translate class fields
// we declare read or written fields
foreach (var field in FieldTranslator.GetFieldDefinitions())
{
streamWriter.WriteLine(field);
}
#endregion
streamWriter.Close();
#region Append bpl input files
foreach (var bplInputFile in Settings.BplInputFiles)
{
var output = new FileStream(outputPath, FileMode.Append, FileAccess.Write);
using (var inputStream = File.OpenRead(bplInputFile))
{
inputStream.CopyTo(output);
}
output.Close();
}
#endregion
}
}
// called from Traverser
// set in Main
public static void TranslateAssemblies(ISet <Assembly> assemblies, ClassHierarchyAnalysis CHA)
{
foreach (Assembly assembly in assemblies)
{
foreach (IMethodDefinition methodDefinition in assembly.GetAllDefinedMethods())
{
if (!methodDefinition.IsExternal)
{
try
{
var disassembler = new Disassembler(assembly.Host, methodDefinition, assembly.PdbReader);
disassembler.Execute();
MethodBody mB = disassembler.MethodBody;
ControlFlowGraph cfg = disassembler.ControlFlowGraph;
// it would be faster to do this while we do
// the global search for field references
if (Settings.MemoryModel == ProgramOptions.MemoryModelOption.Mixed)
{
ReferenceFinder reference = new ReferenceFinder();
reference.CollectLocalVariables(mB);
}
MethodTranslator methodTranslator = new MethodTranslator(methodDefinition, mB, CHA, cfg, assembly, assemblies);
// todo: improve this piece of code
StreamWriter streamWriter = Program.streamWriter;
streamWriter.WriteLine(methodTranslator.Translate());
Helpers.addTranslatedMethod(methodDefinition);
}
catch (InvalidOperationException ex)
{
Console.WriteLine("WARNING: Exception thrown while translating method (omitting): " + BoogieMethod.From(methodDefinition).Name);
if (!Settings.SilentExceptionsForMethods)
{
throw ex;
}
}
}
}
}
}
public static void addTranslatedMethod(IMethodDefinition methodDefinition)
{
methodsTranslated.Add(BoogieMethod.From(methodDefinition).Name);
}
// this method returns all method references that have been stubbed
public IEnumerable <IMethodReference> Stub(ISet <Assembly> inputAssemblies, StreamWriter streamWriter)
{
PropertiesFinder propertiesFinder = new PropertiesFinder();
var nonExternMethods = inputAssemblies.GetAllDefinedMethods().Where(m => m.Body.Size > 0);
var usedProperties = propertiesFinder.FindPropertiesCalls(inputAssemblies).Except(nonExternMethods);
if (Settings.StubGettersSettersWhitelist.Count > 0)
{
usedProperties = usedProperties.Where(p => Settings.StubGettersSettersWhitelist.Contains(BoogieMethod.From(p).Name));
}
var propertyFields = usedProperties.Select(propertyMethod => GetFieldDef(propertyMethod)).ToList().Distinct();
foreach (var propertyDefinition in propertyFields)
{
streamWriter.WriteLine(propertyDefinition);
}
foreach (var property in usedProperties)
{
//streamWriter.WriteLine(GetFieldDef(property));
var proc = property.Name.Value.StartsWith("get_") ? GetProcedureStub(property) : SetProcedureStub(property);
streamWriter.WriteLine(proc);
}
return(usedProperties);
}
// called from Traverser
// set in Main
public static void IMethodDefinitionTraverse(IMethodDefinition mD, IMetadataHost host, ISourceLocationProvider sourceLocationProvider)
{
if (!mD.IsExternal)
{
try
{
var disassembler = new Disassembler(host, mD, sourceLocationProvider);
MethodBody mB = disassembler.Execute();
MethodTranslator.transformBody(mB);
TACWriter.AddMethod(mB);
TACWriter.Write();
}
catch (InvalidOperationException ex)
{
Console.WriteLine("WARNING: Exception thrown while translating method (omitting): " + BoogieMethod.From(mD).Name);
if (!Settings.SilentExceptionsForMethods)
{
throw ex;
}
}
}
}
// called from Traverser
// set in Main
public static void IMethodDefinitionTraverse(IMethodDefinition mD, IMetadataHost host, ISourceLocationProvider sourceLocationProvider)
{
// TODO: Hack to for treating a method as nondet
var method = mD.ResolvedMethod;
var methodName = method.ContainingType.FullName() + "." + method.Name.Value;
if (methodName.Equals("SVX.ContractBase.getNondet"))
{
InstructionTranslator.AddToExternalMethods(method);
return;
}
// End Hack
if (!mD.IsExternal)
{
try
{
if (whitelistContains(mD.ContainingType.FullName()))
{
var disassembler = new Disassembler(host, mD, sourceLocationProvider);
MethodBody mB = disassembler.Execute();
transformBody(mB);
MethodTranslator methodTranslator = new MethodTranslator(mD, mB, Traverser.CHA);
// todo: improve this piece of code
StreamWriter streamWriter = Program.streamWriter;
streamWriter.WriteLine(methodTranslator.Translate());
Helpers.addTranslatedMethod(mD);
}
}
catch (InvalidOperationException ex)
{
Console.WriteLine("WARNING: Exception thrown while translating method (omitting): " + BoogieMethod.From(mD).Name);
if (!Settings.SilentExceptionsForMethods)
{
throw ex;
}
}
}
}
