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13514
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1 /*
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2 * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved. This
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3 * code is released under a tri EPL/GPL/LGPL license. You can use it,
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4 * redistribute it and/or modify it under the terms of the:
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5 *
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6 * Eclipse Public License version 1.0
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7 * GNU General Public License version 2
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8 * GNU Lesser General Public License version 2.1
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9 */
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10 package com.oracle.truffle.ruby.nodes.objects.instancevariables;
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11
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12 import com.oracle.truffle.api.*;
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13 import com.oracle.truffle.api.frame.*;
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14 import com.oracle.truffle.ruby.nodes.*;
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15 import com.oracle.truffle.ruby.runtime.*;
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16 import com.oracle.truffle.ruby.runtime.objects.*;
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17
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18 public abstract class ReadInstanceVariableNode extends RubyNode implements ReadNode {
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19
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20 protected final String name;
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21 @Child protected RubyNode receiver;
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22
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23 public ReadInstanceVariableNode(RubyContext context, SourceSection sourceSection, String name, RubyNode receiver) {
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24 super(context, sourceSection);
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25 this.name = name;
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26 this.receiver = adoptChild(receiver);
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27 }
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28
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29 public ReadInstanceVariableNode respecialize(RubyBasicObject receiverObject) {
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30 final StorageLocation storageLocation = receiverObject.getUpdatedObjectLayout().findStorageLocation(name);
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31
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32 if (storageLocation == null) {
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33 return new ReadMissingInstanceVariableNode(getSourceSection(), name, receiver, receiverObject.getObjectLayout(), getContext());
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34 }
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35
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36 if (storageLocation instanceof FixnumStorageLocation) {
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37 return new ReadFixnumInstanceVariableNode(getContext(), getSourceSection(), name, receiver, storageLocation.getObjectLayout(), (FixnumStorageLocation) storageLocation);
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38 } else if (storageLocation instanceof FloatStorageLocation) {
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39 return new ReadFloatInstanceVariableNode(getContext(), getSourceSection(), name, receiver, storageLocation.getObjectLayout(), (FloatStorageLocation) storageLocation);
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40 } else {
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41 return new ReadObjectInstanceVariableNode(getContext(), getSourceSection(), name, receiver, storageLocation.getObjectLayout(), (ObjectStorageLocation) storageLocation);
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42 }
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43 }
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44
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45 public WriteInstanceVariableNode makeWriteNode(RubyNode rhs) {
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46 return new UninitializedWriteInstanceVariableNode(getContext(), getEncapsulatingSourceSection(), name, (RubyNode) receiver.copy(), rhs);
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47 }
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48
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49 public String getName() {
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50 return name;
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51 }
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52
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53 public RubyNode getReceiver() {
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54 return receiver;
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55 }
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56
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57 @Override
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58 public Object isDefined(VirtualFrame frame) {
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59 final RubyContext context = getContext();
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60
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61 try {
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62 final Object receiverObject = receiver.execute(frame);
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63 final RubyBasicObject receiverRubyObject = context.getCoreLibrary().box(receiverObject);
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64
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65 final ObjectLayout layout = receiverRubyObject.getObjectLayout();
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66 final StorageLocation storageLocation = layout.findStorageLocation(name);
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67
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68 if (storageLocation.isSet(receiverRubyObject)) {
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69 return context.makeString("instance-variable");
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70 } else {
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71 return NilPlaceholder.INSTANCE;
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72 }
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73 } catch (Exception e) {
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74 return NilPlaceholder.INSTANCE;
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75 }
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76 }
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77 }
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