Mercurial > hg > truffle
diff truffle/com.oracle.truffle.api.dsl.test/src/com/oracle/truffle/api/dsl/test/examples/StableDispatch.java @ 21951:9c8c0937da41
Moving all sources into truffle subdirectory
author | Jaroslav Tulach <jaroslav.tulach@oracle.com> |
---|---|
date | Wed, 17 Jun 2015 10:58:08 +0200 |
parents | graal/com.oracle.truffle.api.dsl.test/src/com/oracle/truffle/api/dsl/test/examples/StableDispatch.java@a79a3e467245 |
children | dc83cc1f94f2 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/truffle/com.oracle.truffle.api.dsl.test/src/com/oracle/truffle/api/dsl/test/examples/StableDispatch.java Wed Jun 17 10:58:08 2015 +0200 @@ -0,0 +1,80 @@ +/* + * 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(); + } + } + +}