private void GenerateDownLevelLockStatement(ILockStatement lockStatement)
{
var systemThreading = new NestedUnitNamespaceReference(this.host.PlatformType.SystemObject.ContainingUnitNamespace,
this.host.NameTable.GetNameFor("Threading"));
var systemThreadingMonitor = new NamespaceTypeReference(this.host, systemThreading, this.host.NameTable.GetNameFor("Monitor"), 0,
isEnum: false, isValueType: false, typeCode: PrimitiveTypeCode.NotPrimitive);
var parameters = new IParameterTypeInformation[2];
var monitorEnter = new MethodReference(this.host, systemThreadingMonitor, CallingConvention.Default, this.host.PlatformType.SystemVoid,
this.host.NameTable.GetNameFor("Enter"), 0, this.host.PlatformType.SystemObject);
var monitorExit = new MethodReference(this.host, systemThreadingMonitor, CallingConvention.Default, this.host.PlatformType.SystemVoid,
this.host.NameTable.GetNameFor("Exit"), 0, this.host.PlatformType.SystemObject);
this.EmitSequencePoint(lockStatement.Locations);
var guardObject = new TemporaryVariable(lockStatement.Guard.Type, this.method);
this.Traverse(lockStatement.Guard);
this.generator.Emit(OperationCode.Dup); this.StackSize++;
this.VisitAssignmentTo(guardObject);
this.generator.Emit(OperationCode.Call, monitorEnter);
this.StackSize--;
//try
var savedCurrentTryCatch = this.currentTryCatch;
this.currentTryCatch = lockStatement;
var savedCurrentTryCatchFinallyEnd = this.currentTryCatchFinallyEnd;
this.currentTryCatchFinallyEnd = new ILGeneratorLabel();
this.generator.BeginTryBody();
this.Traverse(lockStatement.Body);
if (!this.lastStatementWasUnconditionalTransfer)
this.generator.Emit(OperationCode.Leave, this.currentTryCatchFinallyEnd);
//finally
this.generator.BeginFinallyBlock();
//if (status)
this.LoadLocal(guardObject);
this.generator.Emit(OperationCode.Call, monitorExit);
this.StackSize--;
//monitor exit
this.generator.Emit(OperationCode.Endfinally);
this.generator.EndTryBody();
this.generator.MarkLabel(this.currentTryCatchFinallyEnd);
this.currentTryCatchFinallyEnd = savedCurrentTryCatchFinallyEnd;
this.currentTryCatch = savedCurrentTryCatch;
this.lastStatementWasUnconditionalTransfer = false;
}
/// <summary>
/// Generates IL for the specified lock statement.
/// </summary>
/// <param name="lockStatement">The lock statement.</param>
public override void TraverseChildren(ILockStatement lockStatement)
{
if (this.host.SystemCoreAssemblySymbolicIdentity.Version.Major < 4) {
this.GenerateDownLevelLockStatement(lockStatement);
return;
}
var systemThreading = new NestedUnitNamespaceReference(this.host.PlatformType.SystemObject.ContainingUnitNamespace,
this.host.NameTable.GetNameFor("Threading"));
var systemThreadingMonitor = new NamespaceTypeReference(this.host, systemThreading, this.host.NameTable.GetNameFor("Monitor"), 0,
isEnum: false, isValueType: false, typeCode: PrimitiveTypeCode.NotPrimitive);
var parameters = new IParameterTypeInformation[2];
var monitorEnter = new MethodReference(this.host, systemThreadingMonitor, CallingConvention.Default, this.host.PlatformType.SystemVoid,
this.host.NameTable.GetNameFor("Enter"), 0, parameters);
parameters[0] = new SimpleParameterTypeInformation(monitorEnter, 0, this.host.PlatformType.SystemObject);
parameters[1] = new SimpleParameterTypeInformation(monitorEnter, 1, this.host.PlatformType.SystemBoolean, isByReference: true);
var monitorExit = new MethodReference(this.host, systemThreadingMonitor, CallingConvention.Default, this.host.PlatformType.SystemVoid,
this.host.NameTable.GetNameFor("Exit"), 0, this.host.PlatformType.SystemObject);
this.EmitSequencePoint(lockStatement.Locations);
var guardObject = new TemporaryVariable(lockStatement.Guard.Type, this.method);
var lockTaken = new TemporaryVariable(this.host.PlatformType.SystemBoolean, this.method);
//try
var savedCurrentTryCatch = this.currentTryCatch;
this.currentTryCatch = lockStatement;
var savedCurrentTryCatchFinallyEnd = this.currentTryCatchFinallyEnd;
this.currentTryCatchFinallyEnd = new ILGeneratorLabel();
this.generator.BeginTryBody();
this.Traverse(lockStatement.Guard);
this.generator.Emit(OperationCode.Dup); this.StackSize++;
this.VisitAssignmentTo(guardObject);
this.LoadAddressOf(lockTaken, null);
this.generator.Emit(OperationCode.Call, monitorEnter);
this.StackSize-=2;
this.Traverse(lockStatement.Body);
if (!this.lastStatementWasUnconditionalTransfer)
this.generator.Emit(OperationCode.Leave, this.currentTryCatchFinallyEnd);
//finally
this.generator.BeginFinallyBlock();
//if (status)
var endIf = new ILGeneratorLabel();
this.LoadLocal(lockTaken);
this.generator.Emit(OperationCode.Brfalse_S, endIf);
this.StackSize--;
this.LoadLocal(guardObject);
this.generator.Emit(OperationCode.Call, monitorExit);
this.StackSize--;
this.generator.MarkLabel(endIf);
//monitor exit
this.generator.Emit(OperationCode.Endfinally);
this.generator.EndTryBody();
this.generator.MarkLabel(this.currentTryCatchFinallyEnd);
this.currentTryCatchFinallyEnd = savedCurrentTryCatchFinallyEnd;
this.currentTryCatch = savedCurrentTryCatch;
this.lastStatementWasUnconditionalTransfer = false;
}
