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annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/local/SLReadLocalVariableNode.java @ 13882:afd6fa5e8229

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SL: Feedback from reviewers
author Christian Wimmer <christian.wimmer@oracle.com>
date Wed, 05 Feb 2014 08:02:15 -0800
parents 64c77f0577bb
children 89ac75425681
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1 /*
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2 * Copyright (c) 2012, 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.local;
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24
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25 import com.oracle.truffle.api.dsl.*;
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26 import com.oracle.truffle.api.frame.*;
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27 import com.oracle.truffle.sl.nodes.*;
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28
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29 /**
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30 * Node to read a local variable from a function's {@link VirtualFrame frame}. The Truffle frame API
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31 * allows to store primitive values of all Java primitive types, and Object values. This means that
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32 * all SL types that are objects are handled by the {@link #readObject} method. When a local
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33 * variable changes its type, the frame access method throws an {@link FrameSlotTypeException},
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34 * which causes not rewriting. The rewriting code is generated by the Truffle DSL.
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35 */
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36 @NodeField(name = "slot", type = FrameSlot.class)
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37 public abstract class SLReadLocalVariableNode extends SLExpressionNode {
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38
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39 /**
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40 * Returns the descriptor of the accessed local variable. The implementation of this method is
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41 * created by the Truffle DSL based on the {@link NodeField} annotation on the class.
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42 */
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43 protected abstract FrameSlot getSlot();
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44
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45 @Specialization(rewriteOn = {FrameSlotTypeException.class})
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46 protected long readLong(VirtualFrame frame) throws FrameSlotTypeException {
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47 return frame.getLong(getSlot());
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48 }
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49
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50 @Specialization(rewriteOn = {FrameSlotTypeException.class})
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51 protected boolean readBoolean(VirtualFrame frame) throws FrameSlotTypeException {
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52 return frame.getBoolean(getSlot());
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53 }
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54
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55 @Specialization(order = 1, rewriteOn = {FrameSlotTypeException.class})
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56 protected Object readObject(VirtualFrame frame) throws FrameSlotTypeException {
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57 return frame.getObject(getSlot());
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58 }
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59
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60 /**
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61 * This is the generic case that always succeeds. Since we already have another specialization
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62 * with the same signature above, we need to order them explicitly with the order attribute.
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63 */
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64 @Specialization(order = 2)
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65 protected Object read(VirtualFrame frame) {
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66 return frame.getValue(getSlot());
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67 }
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68 }