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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.core;
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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.dsl.*;
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14 import com.oracle.truffle.api.nodes.*;
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15 import com.oracle.truffle.ruby.nodes.*;
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16 import com.oracle.truffle.ruby.runtime.*;
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17 import com.oracle.truffle.ruby.runtime.core.array.*;
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18
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19 /**
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20 * Index an array, without using any method lookup. This isn't a call - it's an operation on a core
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21 * class.
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22 */
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23 @NodeInfo(shortName = "array-index")
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24 @NodeChildren({@NodeChild(value = "array", type = RubyNode.class)})
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25 public abstract class ArrayIndexNode extends RubyNode {
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26
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27 final int index;
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28
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29 public ArrayIndexNode(RubyContext context, SourceSection sourceSection, int index) {
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30 super(context, sourceSection);
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31 this.index = index;
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32 }
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33
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34 public ArrayIndexNode(ArrayIndexNode prev) {
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35 super(prev);
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36 index = prev.index;
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37 }
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38
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39 @Specialization(guards = "isEmptyStore", order = 1)
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40 public NilPlaceholder indexEmpty(@SuppressWarnings("unused") RubyArray array) {
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41 return NilPlaceholder.INSTANCE;
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42 }
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43
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44 @Specialization(guards = "isFixnumStore", rewriteOn = UnexpectedResultException.class, order = 2)
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45 public int indexFixnum(RubyArray array) throws UnexpectedResultException {
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46 final FixnumArrayStore store = (FixnumArrayStore) array.getArrayStore();
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47 return store.getFixnum(ArrayUtilities.normaliseIndex(store.size(), index));
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48 }
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49
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50 @Specialization(guards = "isFixnumStore", order = 3)
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51 public Object indexMaybeFixnum(RubyArray array) {
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52 final FixnumArrayStore store = (FixnumArrayStore) array.getArrayStore();
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53
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54 try {
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55 return store.getFixnum(ArrayUtilities.normaliseIndex(store.size(), index));
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56 } catch (UnexpectedResultException e) {
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57 return e.getResult();
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58 }
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59 }
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60
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61 @Specialization(guards = "isFixnumImmutablePairStore", rewriteOn = UnexpectedResultException.class, order = 4)
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62 public int indexFixnumImmutablePair(RubyArray array) throws UnexpectedResultException {
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63 final FixnumImmutablePairArrayStore store = (FixnumImmutablePairArrayStore) array.getArrayStore();
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64 return store.getFixnum(ArrayUtilities.normaliseIndex(store.size(), index));
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65 }
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66
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67 @Specialization(guards = "isFixnumImmutablePairStore", order = 5)
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68 public Object indexMaybeFixnumImmutablePair(RubyArray array) {
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69 final FixnumImmutablePairArrayStore store = (FixnumImmutablePairArrayStore) array.getArrayStore();
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70
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71 try {
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72 return store.getFixnum(ArrayUtilities.normaliseIndex(store.size(), index));
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73 } catch (UnexpectedResultException e) {
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74 return e.getResult();
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75 }
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76 }
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77
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78 @Specialization(guards = "isObjectStore", order = 6)
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79 public Object indexObject(RubyArray array) {
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80 final ObjectArrayStore store = (ObjectArrayStore) array.getArrayStore();
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81 return store.get(ArrayUtilities.normaliseIndex(store.size(), index));
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82 }
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83
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84 @Specialization(guards = "isObjectImmutablePairStore", order = 7)
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85 public Object indexObjectImmutablePair(RubyArray array) {
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86 final ObjectImmutablePairArrayStore store = (ObjectImmutablePairArrayStore) array.getArrayStore();
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87 return store.get(ArrayUtilities.normaliseIndex(store.size(), index));
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88 }
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89
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90 protected boolean isEmptyStore(RubyArray receiver) {
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91 return receiver.getArrayStore() instanceof EmptyArrayStore;
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92 }
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93
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94 protected boolean isFixnumStore(RubyArray receiver) {
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95 return receiver.getArrayStore() instanceof FixnumArrayStore;
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96 }
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97
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98 protected boolean isFixnumImmutablePairStore(RubyArray receiver) {
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99 return receiver.getArrayStore() instanceof FixnumImmutablePairArrayStore;
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100 }
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101
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102 protected boolean isObjectStore(RubyArray receiver) {
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103 return receiver.getArrayStore() instanceof ObjectArrayStore;
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104 }
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105
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106 protected boolean isObjectImmutablePairStore(RubyArray receiver) {
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107 return receiver.getArrayStore() instanceof ObjectImmutablePairArrayStore;
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108 }
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109
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110 }
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