TemporaryReturn() public method

ReturnValue creates on demand the LocalBuilder for the return value from the function. By default this is not used. This is only required when returns are found inside Try or Catch statements. This method is typically invoked from the Emit phase, so we allow the creation of a return label if it was not requested during the resolution phase. Could be cleaned up, but it would replicate a lot of logic in the Emit phase of the code that uses it.
public TemporaryReturn ( ) : LocalBuilder
return System.Reflection.Emit.LocalBuilder
EmitContext Class Documentation
Esempio n. 1
0
		protected override void DoEmit (EmitContext ec)
		{
			if (Expr != null) {
				Expr.Emit (ec);

				if (unwind_protect)
					ec.Emit (OpCodes.Stloc, ec.TemporaryReturn ());
			}

			if (unwind_protect)
				ec.Emit (OpCodes.Leave, ec.ReturnLabel);
			else
				ec.Emit (OpCodes.Ret);
		}
Esempio n. 2
0
		public override void Emit (EmitContext ec)
		{
			if (Report.Errors > 0)
				return;

#if PRODUCTION
			try {
#endif
			if (ec.HasReturnLabel)
				ec.ReturnLabel = ec.DefineLabel ();

			base.Emit (ec);

			ec.Mark (EndLocation);

			if (ec.HasReturnLabel)
				ec.MarkLabel (ec.ReturnLabel);

			if (ec.return_value != null) {
				ec.Emit (OpCodes.Ldloc, ec.return_value);
				ec.Emit (OpCodes.Ret);
			} else {
				//
				// If `HasReturnLabel' is set, then we already emitted a
				// jump to the end of the method, so we must emit a `ret'
				// there.
				//
				// Unfortunately, System.Reflection.Emit automatically emits
				// a leave to the end of a finally block.  This is a problem
				// if no code is following the try/finally block since we may
				// jump to a point after the end of the method.
				// As a workaround, we're always creating a return label in
				// this case.
				//

				if (ec.HasReturnLabel || !unreachable) {
					if (ec.ReturnType != TypeManager.void_type)
						ec.Emit (OpCodes.Ldloc, ec.TemporaryReturn ());
					ec.Emit (OpCodes.Ret);
				}
			}

#if PRODUCTION
			} catch (Exception e){
				Console.WriteLine ("Exception caught by the compiler while emitting:");
				Console.WriteLine ("   Block that caused the problem begin at: " + block.loc);
					
				Console.WriteLine (e.GetType ().FullName + ": " + e.Message);
				throw;
			}
#endif
		}