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view graal/com.oracle.truffle.api.dsl.test/src/com/oracle/truffle/api/dsl/test/examples/StableDispatch.java @ 19315:5664cadb3cee
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author | Doug Simon <doug.simon@oracle.com> |
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date | Thu, 12 Feb 2015 12:00:20 +0100 |
parents | a79a3e467245 |
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/* * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.oracle.truffle.api.dsl.test.examples; import com.oracle.truffle.api.*; import com.oracle.truffle.api.dsl.*; import com.oracle.truffle.api.frame.*; import com.oracle.truffle.api.nodes.*; import com.oracle.truffle.api.utilities.*; /** * This example is based on the SLDispatchNode of SimpleLanguage. It shows how to implement a simple * inline cache with an assumption that needs to be checked. * * Note that if an assumption is invalidated the specialization instantiation is removed. */ @SuppressWarnings("unused") @NodeChildren({@NodeChild("function"), @NodeChild("arguments")}) public class StableDispatch { public static class StableDispatchNode extends ExampleNode { @Specialization(guards = "function == cachedFunction", assumptions = "cachedFunction.getCallTargetStable()") protected static Object directDispatch(VirtualFrame frame, SLFunction function, Object[] arguments, // @Cached("function") SLFunction cachedFunction, // @Cached("create(cachedFunction.getCallTarget())") DirectCallNode callNode) { return callNode.call(frame, arguments); } @Specialization(contains = "directDispatch") protected static Object indirectDispatch(VirtualFrame frame, SLFunction function, Object[] arguments, // @Cached("create()") IndirectCallNode callNode) { return callNode.call(frame, function.getCallTarget(), arguments); } } public static final class SLFunction { private CallTarget callTarget; private final CyclicAssumption callTargetStable; protected SLFunction(String name) { this.callTargetStable = new CyclicAssumption(name); } protected void setCallTarget(CallTarget callTarget) { this.callTarget = callTarget; this.callTargetStable.invalidate(); } public CallTarget getCallTarget() { return callTarget; } public Assumption getCallTargetStable() { return callTargetStable.getAssumption(); } } }