Mercurial > hg > graal-compiler
annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/local/SLReadLocalVariableNode.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 |
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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 } |