Mercurial > hg > graal-jvmci-8
view graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/call/SLUninitializedDispatchNode.java @ 13943:89ac75425681
SL: small cleanups
author | Christian Wimmer <christian.wimmer@oracle.com> |
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date | Wed, 12 Feb 2014 10:30:42 -0800 |
parents | 64c77f0577bb |
children | 96bd95f62d92 |
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/* * Copyright (c) 2013, 2014, 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.sl.nodes.call; import com.oracle.truffle.api.*; import com.oracle.truffle.api.frame.*; import com.oracle.truffle.api.nodes.*; import com.oracle.truffle.sl.*; import com.oracle.truffle.sl.runtime.*; /** * The last entry of a polymorphic inline cache. */ final class SLUninitializedDispatchNode extends SLAbstractDispatchNode { /** * When we reach this method, all the previous cache entries did not match the function. If the * cache is still small enough, we extend it by adding another {@link SLDirectDispatchNode}. If * the cache reached its maximum size, we replace the whole dispatch chain with a * {@link SLGenericDispatchNode}. */ @Override protected Object executeDispatch(VirtualFrame frame, SLFunction function, SLArguments arguments) { /* The following code modifies the AST, so compiled code must be invalidated. */ CompilerDirectives.transferToInterpreterAndInvalidate(); /* * Count the number of SLDirectDispatchNodes we already have in the cache. We walk the chain * of parent nodes until we hit the SLCallNode. We know that a SLCallNode is always present. */ Node cur = this; int depth = 0; while (cur.getParent() instanceof SLAbstractDispatchNode) { cur = cur.getParent(); depth++; } SLInvokeNode invokeNode = (SLInvokeNode) cur.getParent(); SLAbstractDispatchNode specialized; if (function.getCallTarget() == null) { /* Corner case: the function is not defined, so report an error to the user. */ throw new SLException("Call of undefined function: " + function.getName()); } else if (depth < INLINE_CACHE_SIZE) { /* Extend the inline cache. Allocate the new cache entry, and the new end of the cache. */ SLAbstractDispatchNode next = new SLUninitializedDispatchNode(); SLAbstractDispatchNode direct = new SLDirectDispatchNode(next, function); /* Replace ourself with the new cache entry. */ specialized = replace(direct); } else { /* Cache size exceeded, fall back to a single generic dispatch node. */ SLAbstractDispatchNode generic = new SLGenericDispatchNode(); /* Replace the whole chain, not just ourself, with the new generic node. */ specialized = invokeNode.dispatchNode.replace(generic); } /* * Execute the newly created node perform the actual dispatch. That saves us from * duplicating the actual call logic here. */ return specialized.executeDispatch(frame, function, arguments); } }