Mercurial > hg > graal-compiler
view graal/com.oracle.truffle.ruby.nodes/src/com/oracle/truffle/ruby/nodes/control/ElidableResultNode.java @ 13792:9e7acc9cad8e
kill unused frame states when loop exits are removed
thanks to Gilles
author | Andreas Woess <andreas.woess@jku.at> |
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date | Tue, 28 Jan 2014 23:38:22 +0100 |
parents | 0fbee3eb71f0 |
children |
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/* * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved. This * code is released under a tri EPL/GPL/LGPL license. You can use it, * redistribute it and/or modify it under the terms of the: * * Eclipse Public License version 1.0 * GNU General Public License version 2 * GNU Lesser General Public License version 2.1 */ package com.oracle.truffle.ruby.nodes.control; import com.oracle.truffle.api.*; import com.oracle.truffle.api.frame.*; import com.oracle.truffle.api.nodes.*; import com.oracle.truffle.ruby.nodes.*; import com.oracle.truffle.ruby.runtime.*; /** * This node has a pair of children - one required and one elidable result. The required node is * always executed, but its result is discarded. Therefore it should perform some useful side * effects. The elidable node is executed, and its result value returned, if an execute method with * a non-void type is used. It is not executed at all if a void typed execute method is used. * Therefore it should not perform any observable side effects. */ @NodeInfo(shortName = "elidable-result") public class ElidableResultNode extends RubyNode { @Child protected RubyNode required; @Child protected RubyNode elidableResult; public ElidableResultNode(RubyContext context, SourceSection sourceSection, RubyNode required, RubyNode elidableResult) { super(context, sourceSection); this.required = adoptChild(required); this.elidableResult = adoptChild(elidableResult); } @Override public int executeFixnum(VirtualFrame frame) throws UnexpectedResultException { required.executeVoid(frame); return elidableResult.executeFixnum(frame); } @Override public double executeFloat(VirtualFrame frame) throws UnexpectedResultException { required.executeVoid(frame); return elidableResult.executeFloat(frame); } @Override public Object execute(VirtualFrame frame) { required.executeVoid(frame); return elidableResult.execute(frame); } @Override public void executeVoid(VirtualFrame frame) { required.execute(frame); } @Override public Object isDefined(VirtualFrame frame) { return elidableResult.isDefined(frame); } }