public override StatementList WriteAddr(Addressable addr, Expression expr)
{
if (addr is InstanceField instanceField)
{
var instanceName = instanceField.Instance;
var fieldName = FieldTranslator.GetFieldName(instanceField.Field);
if (Settings.SplitFieldsEnabled())
{
return(SplitFieldUpdate.ForKeyValue(instanceField, expr));
}
else
{
return(HeapUpdate.ForKeyValue(instanceField, expr));
}
}
else if (addr is StaticField staticField)
{
var boogieVar = BoogieVariable.From(staticField);
return(bg.VariableAssignment(boogieVar, expr));
}
else if (addr is DotNetVariable v)
{
return(BoogieStatement.VariableAssignment(BoogieVariable.FromDotNetVariable(v.Var), expr));
}
else
{
throw new NotImplementedException();
}
}
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 override StatementList AllocLocalVariables(IList <IVariable> variables)
{
StatementList stmts = new StatementList();
// we allocate an address for all local variables
// except they are a pointer, we are assuming that you can't take the address of a pointer
foreach (var v in variables)
{
if (!(v.Type is IManagedPointerType))
{
stmts.Add(dispatcher.AllocAddr(v));
}
}
// load values into stack space
foreach (var paramVariable in variables.Where(v => v.IsParameter))
{
// paramValue are variables in the three address code
// however in boogie they are treated as values
// those values are loaded into the stack memory space
/*
* void foo(int x){
* }
*
* procedure foo(x : int){
* var _x : Addr; // stack space (done in previous loop)
* x_ := AllocAddr();
*
* data(_x) := x; // we are doing this conceptually
* }
*/
var boogieParamVariable = BoogieParameter.FromDotNetVariable(paramVariable);
if (paramVariable.Type is IManagedPointerType)
{
stmts.Add(BoogieStatement.VariableAssignment(BoogieVariable.AddressVar(paramVariable), boogieParamVariable));
continue;
}
Addressable paramAddress = dispatcher.AddressOf(paramVariable);
// boogie generator knows that must fetch paramVariable's address (_x and not x)
stmts.Add(dispatcher.WriteAddr(paramAddress, boogieParamVariable));
if (Helpers.GetBoogieType(paramVariable).Equals(Helpers.BoogieType.Object))
{
stmts.Add(BoogieStatement.AllocObjectAxiom(paramVariable));
}
else if (Helpers.GetBoogieType(paramVariable).Equals(Helpers.BoogieType.Addr))
{
stmts.Add(BoogieStatement.AllocAddrAxiom(paramVariable));
}
}
return(stmts);
}
public override StatementList VariableAssignment(IVariable variableA, IValue value)
{
Constant cons = value as Constant;
BoogieLiteral boogieConstant = null;
if (cons != null)
{
boogieConstant = BoogieLiteral.FromDotNetConstant(cons);
}
var boogieType = Helpers.GetBoogieType(variableA);
if (value is Constant)
{
if (boogieConstant != null)
{
return(bg.VariableAssignment(variableA, boogieConstant));
}
else
{
throw new NotImplementedException();
// return WriteAddr(variableA, value.ToString());
}
}
else if (value is IVariable && !(value.Type is IManagedPointerType))
{ // right operand is not a pointer (therefore left operand is not a pointer)
return(dispatcher.WriteAddr(dispatcher.AddressOf(variableA), dispatcher.ReadAddr(value as IVariable)));
}
else if (value is Dereference)
{
var dereference = value as Dereference;
var content = dispatcher.ReadAddr(dereference.Reference);
return(dispatcher.WriteAddr(dispatcher.AddressOf(variableA), content));
}
else if (value.Type is IManagedPointerType)
{
// if the right operand is a pointer also the left one is a pointer
// there are two cases for value:
// 1) value has the form &<something> (in analysis-net this is a Reference object)
// 2) value is just a variable (static, instance, local, array element) with pointer type
// for 1) we want to take the allocated address of something and assign it to the boogie variable of the left operand
// for 2) we just want to make a boogie assignment between the boogie variables of the left and right operands
// AddressOf will do the work to separate case 1) and 2)
var addr = dispatcher.AddressOf(value) as AddressExpression;
Contract.Assume(addr != null);
return(BoogieStatement.VariableAssignment(BoogieVariable.AddressVar(variableA), addr.Expr));
}
Contract.Assert(false);
// This shouldn't be reachable.
throw new NotImplementedException();
}
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 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 override StatementList DeclareLocalVariables(IList <IVariable> variables, Dictionary <string, BoogieVariable> temporalVariables)
{
StatementList stmts = new StatementList();
foreach (var v in variables.Where(v => !v.IsParameter))
{
stmts.Add(BoogieStatement.VariableDeclaration(v));
}
foreach (var kv in temporalVariables)
{
stmts.Add(BoogieStatement.VariableDeclaration(kv.Value));
}
return(stmts);
}
// hides implementation in super class
//public new string VariableAssignment(string variableA, string expr)
//{
// return string.Format("{0} := {1};", variableA, expr);
//}
public override StatementList DeclareLocalVariables(IList <IVariable> variables, Dictionary <string, BoogieVariable> temporalVariables)
{
var stmts = new StatementList();
foreach (var v in variables)
{
stmts.Add(BoogieStatement.VariableDeclaration(BoogieVariable.AddressVar(v)));
}
foreach (var kv in temporalVariables)
{
stmts.Add(BoogieStatement.VariableDeclaration(kv.Value));
}
return(stmts);
}
public override StatementList AllocLocalVariables(IList <IVariable> variables)
{
StatementList stmts = new StatementList();
// only allocate an address for variables that are referenced
foreach (var v in variables)
{
if (RequiresAllocation(v))
{
stmts.Add(AllocAddr(v));
}
}
foreach (var paramVariable in variables.Where(v => v.IsParameter && (RequiresAllocation(v) || (v.Type is IManagedPointerType))))
{
var boogieParamVariable = BoogieParameter.FromDotNetVariable(paramVariable);
//if (!RequiresAllocation(paramVariable))
if (paramVariable.Type is IManagedPointerType)
{
//BoogieVariable target = RequiresAllocation(paramVariable) || (paramVariable.Type is IManagedPointerType) ?
// BoogieVariable.AddressVar(paramVariable) : BoogieVariable.FromDotNetVariable(paramVariable);
BoogieVariable target = BoogieVariable.AddressVar(paramVariable);
stmts.Add(BoogieStatement.VariableAssignment(target, boogieParamVariable));
continue;
}
Addressable paramAddress = AddressOf(paramVariable);
// boogie generator knows that must fetch paramVariable's address (_x and not x)
stmts.Add(WriteAddr(paramAddress, boogieParamVariable));
if (Helpers.GetBoogieType(paramVariable).Equals(Helpers.BoogieType.Object))
{
stmts.Add(BoogieStatement.AllocObjectAxiom(paramVariable));
}
else if (Helpers.GetBoogieType(paramVariable).Equals(Helpers.BoogieType.Addr))
{
stmts.Add(BoogieStatement.AllocAddrAxiom(paramVariable));
}
}
return(stmts);
}
public string AsyncStubsScheduleTask(bool genericVersion = false)
{
StatementList localVars = new StatementList();
localVars.Add(BoogieStatement.FromString("var state : bool;"));
StatementList instructions = new StatementList();
var param0 = new BoogieVariable(Helpers.BoogieType.Object, "sm");
var procIsCompleted = genericVersion ? BoogieMethod.AsyncStubsTaskAwaiterIsCompletedGeneric : BoogieMethod.AsyncStubsTaskAwaiterIsCompleted;
var awaiterVar = new BoogieVariable(Helpers.BoogieType.Object, "awaiter");
var stateVar = new BoogieVariable(Helpers.BoogieType.Bool, "state");
var argsList = new List <Expression>();
argsList.Add(awaiterVar);
var resList = new List <BoogieVariable>();
resList.Add(stateVar);
var callIsCompleted = BoogieStatement.ProcedureCall(procIsCompleted, argsList, resList, stateVar);
var assume = BoogieStatement.Assume(Expression.BinaryOperationExpression(stateVar, new Expression(Helpers.BoogieType.Bool, "true"), Backend.ThreeAddressCode.Instructions.BinaryOperation.Eq));
var yield = BoogieStatement.FromString("yield;");
// it is crucial to yield before anything else
instructions.Add(yield);
instructions.Add(callIsCompleted);
instructions.Add(assume);
var moveNextMethods = stateMachinesTypes.Select(t => t.Members.Where(m => m.Name.Value.Contains("MoveNext")).First()).Cast <IMethodDefinition>();
var ifCases = moveNextMethods.Select(m => Invoke(m, param0));
foreach (var ifCase in ifCases)
{
instructions.Add(ifCase);
}
string procedureName = genericVersion ? "$AsyncStubs`1$ScheduleTask" : "$AsyncStubs$ScheduleTask";
var procedureTemplate = new BoogieProcedureTemplate(procedureName, "", localVars, instructions, "awaiter : Object, sm : Object", String.Empty, false);
return(procedureTemplate.TransformText());
}
public static void CreateAllAsyncMethods(StreamWriter sw)
{
StatementList stmts = new StatementList();
Action <StatementList> fStmt = (s => stmts.Add(s));
Action <string> fStr = (s => fStmt(BoogieStatement.FromString(s)));
var taskVar = BoogieVariable.GetTempVar(Helpers.ObjectType(), null, "task");
var objectTypeStr = Helpers.ObjectType().FirstUppercase();
fStr($"var resultAsync : [{objectTypeStr}] {objectTypeStr};");
fStr($"var builder2task: [{objectTypeStr}] {objectTypeStr};");
fStr($"procedure {{:extern}} System.Threading.Tasks.Task`1.get_Result(this : {objectTypeStr}) returns ($result : {objectTypeStr}) {{");
fStr("$result := resultAsync[this];");
fStr("}");
fStr("");
fStr($"procedure {{:extern}} System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1.Create() returns ($result : {objectTypeStr}) {{");
fStmt(BoogieStatement.VariableDeclaration(taskVar));
var bg = BoogieGenerator.Instance();
fStmt(bg.AllocObject(taskVar));
fStmt(BoogieStatement.Assume(Expression.IsTask(taskVar)));
var resultVar = BoogieVariable.ResultVar(Helpers.ObjectType());
fStmt(bg.AllocObject(resultVar));
fStmt(BoogieStatement.Assume(Expression.IsAsyncTaskMethodBuilder(resultVar)));
fStr($"builder2task[$result] := {taskVar.Expr};");
fStr("}");
fStr($"procedure {{:extern}} System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1.get_Task(this : {objectTypeStr}) returns ($result : {objectTypeStr}) {{");
fStr("$result := builder2task[this];");
fStr("}");
fStr($"procedure {{:extern}} System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1.SetResult$`0(this : {objectTypeStr},result : {objectTypeStr}) {{");
fStr($"var task : {objectTypeStr};");
fStr("task := builder2task[this];");
fStr($"resultAsync[task] := result;");
fStr("}");
foreach (var stmt in stmts)
{
sw.WriteLine(stmt.Stmt);
}
CreateAsyncStartMethod(sw);
}
public override StatementList WriteAddr(Addressable addr, Expression expr)
{
if (addr is AddressExpression addrExpr)
{
if (expr.Type.Equals(Helpers.BoogieType.Addr))
{
// pointer = pointer does not require map indexing in boogie
// it is just a variable assignment
BoogieVariable v = new BoogieVariable(expr.Type, addrExpr.Expr.Expr);
return(BoogieStatement.VariableAssignment(v, expr));
}
return(TypedMemoryMapUpdate.ForKeyValue(addrExpr, expr));
}
else
{
throw new NotImplementedException();
}
}
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 override StatementList DeclareLocalVariables(IList <IVariable> variables, Dictionary <string, BoogieVariable> temporalVariables)
{
var stmts = new StatementList();
foreach (var v in variables)
{
if (RequiresAllocation(v) || v.Type is IManagedPointerType)
{
stmts.Add(BoogieStatement.VariableDeclaration(BoogieVariable.AddressVar(v)));
}
else if (!v.IsParameter)
{
stmts.Add(BoogieStatement.VariableDeclaration(v));
}
}
foreach (var kv in temporalVariables)
{
stmts.Add(BoogieStatement.VariableDeclaration(kv.Value));
}
return(stmts);
}