public override void Emit()
{
//MarkSequencePoint(context);
IL.BeginCatchBlock(exType.SharpType);
EmitHelper.StormVar(IL, exSymbol.VarBuilder);
StmtBody.Emit();
IL.EndExceptionBlock();
}
/// <summary>
/// Begins a catch block for the given exception type in the given exception block.
///
/// The given exception block must still be open.
/// </summary>
public CatchBlock BeginCatchBlock(ExceptionBlock forTry, Type exceptionType)
{
if (exceptionType == null)
{
throw new ArgumentNullException("exceptionType");
}
if (forTry == null)
{
throw new ArgumentNullException("forTry");
}
if (((IOwned)forTry).Owner != this)
{
FailOwnership(forTry);
}
if (CurrentExceptionBlock.Count > 0 && forTry != CurrentExceptionBlock.Peek())
{
throw new InvalidOperationException("Cannot start CatchBlock on " + forTry + " while inner ExceptionBlock is still open");
}
if (!typeof(Exception).IsAssignableFrom(exceptionType))
{
throw new ArgumentException("BeginCatchBlock expects a type descending from Exception, found " + exceptionType, "exceptionType");
}
var currentlyOpen = CatchBlocks.Where(c => c.Key.ExceptionBlock == forTry && c.Value.Item2 == -1).Select(s => s.Key).SingleOrDefault();
if (currentlyOpen != null)
{
throw new InvalidOperationException("Cannot start a new catch block, " + currentlyOpen + " has not been ended");
}
if (MustMark)
{
MarkLabel(DefineLabel(AutoNamer.Next(this, "__autolabel")));
}
UpdateState(Wrap(new[] { new StackTransition(0) }, "BeginCatchBlock"));
var tryBlock = TryBlocks[forTry];
if (tryBlock.Item2 != -1)
{
throw new SigilVerificationException("BeginCatchBlock expects an unclosed exception block, but " + forTry + " is already closed", IL.Instructions(AllLocals));
}
IL.BeginCatchBlock(exceptionType);
UpdateState(Wrap(StackTransition.Push(exceptionType), "BeginCatchBlock"));
var ret = new CatchBlock(exceptionType, forTry);
CatchBlocks[ret] = SigilTuple.Create(IL.Index, -1);
return(ret);
}
private void Catch()
{
var ex = IL.DeclareLocal(typeof(Exception));
IL.BeginCatchBlock(typeof(Exception)); // catch
IL.Emit(OpCodes.Stloc_S, ex); // (Exception ex) {
InvokeOnError(ex); // _callHandler.AfterCall(obj, methodInfo, args);
IL.EndExceptionBlock(); // }
}
private void EmitCatchStart(CatchBlock cb)
{
if (cb.Filter == null)
{
EmitSaveExceptionOrPop(cb);
return;
}
// emit filter block. Filter blocks are untyped so we need to do
// the type check ourselves.
var endFilter = IL.DefineLabel();
var rightType = IL.DefineLabel();
// skip if it's not our exception type, but save
// the exception if it is so it's available to the
// filter
IL.Emit(OpCodes.Isinst, cb.Test);
IL.Emit(OpCodes.Dup);
IL.Emit(OpCodes.Brtrue, rightType);
IL.Emit(OpCodes.Pop);
IL.Emit(OpCodes.Ldc_I4_0);
IL.Emit(OpCodes.Br, endFilter);
// it's our type, save it and emit the filter.
IL.MarkLabel(rightType);
EmitSaveExceptionOrPop(cb);
var parent = _labelBlock;
_labelBlock = new LabelScopeInfo(parent, LabelScopeKind.Filter);
EmitExpression(cb.Filter);
_labelBlock = parent;
// begin the catch, clear the exception, we've
// already saved it
IL.MarkLabel(endFilter);
IL.BeginCatchBlock(null);
IL.Emit(OpCodes.Pop);
}
private void EmitTryExpression(Expression expr)
{
var node = (TryExpression)expr;
CheckTry();
//******************************************************************
// 1. ENTERING TRY
//******************************************************************
PushLabelBlock(LabelScopeKind.Try);
IL.BeginExceptionBlock();
//******************************************************************
// 2. Emit the try statement body
//******************************************************************
EmitExpression(node.Body);
var tryType = node.Type;
LocalBuilder value = null;
if (tryType != typeof(void))
{
//store the value of the try body
value = GetLocal(tryType);
IL.Emit(OpCodes.Stloc, value);
}
//******************************************************************
// 3. Emit the catch blocks
//******************************************************************
foreach (var cb in node.Handlers)
{
PushLabelBlock(LabelScopeKind.Catch);
// Begin the strongly typed exception block
if (cb.Filter == null)
{
IL.BeginCatchBlock(cb.Test);
}
else
{
IL.BeginExceptFilterBlock();
}
EnterScope(cb);
EmitCatchStart(cb);
//
// Emit the catch block body
//
EmitExpression(cb.Body);
if (tryType != typeof(void))
{
//store the value of the catch block body
// ReSharper disable once AssignNullToNotNullAttribute
IL.Emit(OpCodes.Stloc, value);
}
ExitScope(cb);
PopLabelBlock(LabelScopeKind.Catch);
}
//******************************************************************
// 4. Emit the finally block
//******************************************************************
if (node.Finally != null || node.Fault != null)
{
PushLabelBlock(LabelScopeKind.Finally);
if (node.Finally != null)
{
IL.BeginFinallyBlock();
}
else
{
IL.BeginFaultBlock();
}
// Emit the body
EmitExpressionAsVoid(node.Finally ?? node.Fault);
IL.EndExceptionBlock();
PopLabelBlock(LabelScopeKind.Finally);
}
else
{
IL.EndExceptionBlock();
}
if (tryType != typeof(void))
{
// ReSharper disable once AssignNullToNotNullAttribute
IL.Emit(OpCodes.Ldloc, value);
FreeLocal(value);
}
PopLabelBlock(LabelScopeKind.Try);
}
private void EmitTryExpression(Expression expr)
{
var node = (TryExpression)expr;
CheckTry(_labelBlock);
//******************************************************************
// 1. ENTERING TRY
//******************************************************************
var parent = _labelBlock;
_labelBlock = new LabelScopeInfo(parent, LabelScopeKind.Try);
IL.BeginExceptionBlock();
//******************************************************************
// 2. Emit the try statement body
//******************************************************************
EmitExpression(node.Body);
var tryType = node.Type;
LocalBuilder?value = null;
if (tryType != typeof(void))
{
//store the value of the try body
value = GetLocal(tryType);
IL.Emit(OpCodes.Stloc, value);
}
//******************************************************************
// 3. Emit the catch blocks
//******************************************************************
foreach (var cb in node.Handlers)
{
var tmpParent = _labelBlock;
_labelBlock = new LabelScopeInfo(tmpParent, LabelScopeKind.Catch);
// Begin the strongly typed exception block
if (cb.Filter == null)
{
IL.BeginCatchBlock(cb.Test);
}
else
{
IL.BeginExceptFilterBlock();
}
var innerScopeInfo = GetInnerScope(node, _scope);
if (innerScopeInfo.HasValue)
{
_scope = innerScopeInfo.Value.child.Enter(this, innerScopeInfo.Value.parent);
}
EmitCatchStart(cb);
//
// Emit the catch block body
//
EmitExpression(cb.Body);
if (tryType != typeof(void))
{
//store the value of the catch block body
// ReSharper disable once AssignNullToNotNullAttribute
IL.Emit(OpCodes.Stloc, value);
}
if (innerScopeInfo.HasValue)
{
innerScopeInfo.Value.child.Exit();
_scope = innerScopeInfo.Value.parent;
}
_labelBlock = tmpParent;
}
//******************************************************************
// 4. Emit the finally block
//******************************************************************
if (node.Finally != null || node.Fault != null)
{
var tmpParent = _labelBlock;
_labelBlock = new LabelScopeInfo(tmpParent, LabelScopeKind.Finally);
if (node.Finally != null)
{
IL.BeginFinallyBlock();
}
else
{
IL.BeginFaultBlock();
}
// Emit the body
EmitExpressionAsVoid(node.Finally ?? node.Fault !);
IL.EndExceptionBlock();
_labelBlock = tmpParent;
}
else
{
IL.EndExceptionBlock();
}
if (value != null)
{
// ReSharper disable once AssignNullToNotNullAttribute
IL.Emit(OpCodes.Ldloc, value);
FreeLocal(value);
}
_labelBlock = parent;
}