void EmitMoveNext_NoResumePoints(EmitContext ec)
{
ec.EmitThis();
ec.Emit(OpCodes.Ldfld, storey.PC.Spec);
ec.EmitThis();
ec.EmitInt((int)IteratorStorey.State.After);
ec.Emit(OpCodes.Stfld, storey.PC.Spec);
// We only care if the PC is zero (start executing) or non-zero (don't do anything)
ec.Emit(OpCodes.Brtrue, move_next_error);
BodyEnd = ec.DefineLabel();
var async_init = this as AsyncInitializer;
if (async_init != null)
{
ec.BeginExceptionBlock();
}
block.EmitEmbedded(ec);
if (async_init != null)
{
async_init.EmitCatchBlock(ec);
}
ec.MarkLabel(BodyEnd);
EmitMoveNextEpilogue(ec);
ec.MarkLabel(move_next_error);
if (ReturnType.Kind != MemberKind.Void)
{
ec.EmitInt(0);
ec.Emit(OpCodes.Ret);
}
ec.MarkLabel(move_next_ok);
}
void EmitMoveNext(EmitContext ec)
{
move_next_ok = ec.DefineLabel();
move_next_error = ec.DefineLabel();
if (resume_points == null)
{
EmitMoveNext_NoResumePoints(ec);
return;
}
current_pc = ec.GetTemporaryLocal(ec.BuiltinTypes.UInt);
ec.EmitThis();
ec.Emit(OpCodes.Ldfld, storey.PC.Spec);
ec.Emit(OpCodes.Stloc, current_pc);
// We're actually in state 'running', but this is as good a PC value as any if there's an abnormal exit
ec.EmitThis();
ec.EmitInt((int)IteratorStorey.State.After);
ec.Emit(OpCodes.Stfld, storey.PC.Spec);
Label[] labels = new Label[1 + resume_points.Count];
labels[0] = ec.DefineLabel();
bool need_skip_finally = false;
for (int i = 0; i < resume_points.Count; ++i)
{
ResumableStatement s = resume_points[i];
need_skip_finally |= s is ExceptionStatement;
labels[i + 1] = s.PrepareForEmit(ec);
}
if (need_skip_finally)
{
skip_finally = ec.GetTemporaryLocal(ec.BuiltinTypes.Bool);
ec.EmitInt(0);
ec.Emit(OpCodes.Stloc, skip_finally);
}
var async_init = this as AsyncInitializer;
if (async_init != null)
{
ec.BeginExceptionBlock();
}
ec.Emit(OpCodes.Ldloc, current_pc);
ec.Emit(OpCodes.Switch, labels);
ec.Emit(async_init != null ? OpCodes.Leave : OpCodes.Br, move_next_error);
ec.MarkLabel(labels[0]);
BodyEnd = ec.DefineLabel();
block.EmitEmbedded(ec);
ec.MarkLabel(BodyEnd);
if (async_init != null)
{
async_init.EmitCatchBlock(ec);
}
ec.Mark(Block.Original.EndLocation);
ec.EmitThis();
ec.EmitInt((int)IteratorStorey.State.After);
ec.Emit(OpCodes.Stfld, storey.PC.Spec);
EmitMoveNextEpilogue(ec);
ec.MarkLabel(move_next_error);
if (ReturnType.Kind != MemberKind.Void)
{
ec.EmitInt(0);
ec.Emit(OpCodes.Ret);
}
ec.MarkLabel(move_next_ok);
if (ReturnType.Kind != MemberKind.Void)
{
ec.EmitInt(1);
ec.Emit(OpCodes.Ret);
}
}
