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annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/call/SLUninitializedDispatchNode.java @ 13836:64c77f0577bb

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More documentation and improvements of Simple Language
author Christian Wimmer <christian.wimmer@oracle.com>
date Thu, 30 Jan 2014 17:53:27 -0800
parents b16ec83edc73
children 89ac75425681
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1 /*
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2 * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.truffle.sl.nodes.call;
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24
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25 import com.oracle.truffle.api.*;
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26 import com.oracle.truffle.api.frame.*;
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27 import com.oracle.truffle.api.nodes.*;
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28 import com.oracle.truffle.sl.*;
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29 import com.oracle.truffle.sl.runtime.*;
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30
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31 /**
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32 * The last entry of a polymorphic inline cache.
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33 */
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34 final class SLUninitializedDispatchNode extends SLAbstractDispatchNode {
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35
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36 /**
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37 * When we reach this method, all the previous cache entries did not match the function. If the
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38 * cache is still small enough, we extend it by adding another {@link SLDirectDispatchNode}. If
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39 * the cache reached its maximum size, we replace the whole dispatch chain with a
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40 * {@link SLGenericDispatchNode}.
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41 */
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42 @Override
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43 protected Object executeDispatch(VirtualFrame frame, SLFunction function, SLArguments arguments) {
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44 /* The following code modifies the AST, so compiled code must be invalidated. */
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45 CompilerDirectives.transferToInterpreterAndInvalidate();
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46
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47 /*
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48 * Count the number of SLDirectDispatchNodes we already have in the cache. We walk the chain
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49 * of parent nodes until we hit the SLCallNode. We know that a SLCallNode is always present.
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50 */
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51 Node cur = this;
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52 int depth = 0;
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53 while (cur.getParent() instanceof SLAbstractDispatchNode) {
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54 cur = cur.getParent();
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55 depth++;
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56 }
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57 SLCallNode callNode = (SLCallNode) cur.getParent();
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58
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59 SLAbstractDispatchNode specialized;
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60 if (function.getCallTarget() == null) {
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61 /* Corner case: the function is not defined, so report an error to the user. */
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62 throw new SLException("Call of undefined function: " + function.getName());
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63
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64 } else if (depth < INLINE_CACHE_SIZE) {
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65 /* Extend the inline cache. Allocate the new cache entry, and the new end of the cache. */
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66 SLAbstractDispatchNode next = new SLUninitializedDispatchNode();
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67 SLAbstractDispatchNode direct = new SLDirectDispatchNode(next, function);
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68 /* Replace ourself with the new cache entry. */
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69 specialized = replace(direct);
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70
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71 } else {
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72 /* Cache size exceeded, fall back to a single generic dispatch node. */
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73 SLAbstractDispatchNode generic = new SLGenericDispatchNode();
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74 /* Replace the whole chain, not just ourself, with the new generic node. */
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75 specialized = callNode.dispatchNode.replace(generic);
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76 }
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77
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78 /*
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79 * Execute the newly created node perform the actual dispatch. That saves us from
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80 * duplicating the actual call logic here.
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81 */
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82 return specialized.executeDispatch(frame, function, arguments);
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83 }
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84 }