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1 /* |
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2 * Copyright (c) 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 */ |
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24 |
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25 #include "precompiled.hpp" |
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26 #include "opto/narrowptrnode.hpp" |
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27 #include "opto/phaseX.hpp" |
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28 |
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29 Node* DecodeNNode::Identity(PhaseGVN* phase) { |
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30 const Type *t = phase->type( in(1) ); |
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31 if( t == Type::TOP ) return in(1); |
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32 |
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33 if (in(1)->is_EncodeP()) { |
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34 // (DecodeN (EncodeP p)) -> p |
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35 return in(1)->in(1); |
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36 } |
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37 return this; |
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38 } |
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39 |
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40 const Type* DecodeNNode::Value(PhaseGVN* phase) const { |
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41 const Type *t = phase->type( in(1) ); |
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42 if (t == Type::TOP) return Type::TOP; |
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43 if (t == TypeNarrowOop::NULL_PTR) return TypePtr::NULL_PTR; |
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44 |
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45 assert(t->isa_narrowoop(), "only narrowoop here"); |
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46 return t->make_ptr(); |
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47 } |
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48 |
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49 Node* EncodePNode::Identity(PhaseGVN* phase) { |
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50 const Type *t = phase->type( in(1) ); |
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51 if( t == Type::TOP ) return in(1); |
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52 |
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53 if (in(1)->is_DecodeN()) { |
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54 // (EncodeP (DecodeN p)) -> p |
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55 return in(1)->in(1); |
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56 } |
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57 return this; |
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58 } |
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59 |
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60 const Type* EncodePNode::Value(PhaseGVN* phase) const { |
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61 const Type *t = phase->type( in(1) ); |
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62 if (t == Type::TOP) return Type::TOP; |
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63 if (t == TypePtr::NULL_PTR) return TypeNarrowOop::NULL_PTR; |
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64 |
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65 assert(t->isa_oop_ptr(), "only oopptr here"); |
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66 return t->make_narrowoop(); |
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67 } |
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68 |
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69 |
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70 Node* DecodeNKlassNode::Identity(PhaseGVN* phase) { |
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71 const Type *t = phase->type( in(1) ); |
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72 if( t == Type::TOP ) return in(1); |
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73 |
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74 if (in(1)->is_EncodePKlass()) { |
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75 // (DecodeNKlass (EncodePKlass p)) -> p |
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76 return in(1)->in(1); |
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77 } |
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78 return this; |
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79 } |
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80 |
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81 const Type* DecodeNKlassNode::Value(PhaseGVN* phase) const { |
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82 const Type *t = phase->type( in(1) ); |
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83 if (t == Type::TOP) return Type::TOP; |
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84 assert(t != TypeNarrowKlass::NULL_PTR, "null klass?"); |
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85 |
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86 assert(t->isa_narrowklass(), "only narrow klass ptr here"); |
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87 return t->make_ptr(); |
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88 } |
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89 |
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90 Node* EncodePKlassNode::Identity(PhaseGVN* phase) { |
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91 const Type *t = phase->type( in(1) ); |
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92 if( t == Type::TOP ) return in(1); |
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93 |
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94 if (in(1)->is_DecodeNKlass()) { |
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95 // (EncodePKlass (DecodeNKlass p)) -> p |
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96 return in(1)->in(1); |
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97 } |
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98 return this; |
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99 } |
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100 |
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101 const Type* EncodePKlassNode::Value(PhaseGVN* phase) const { |
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102 const Type *t = phase->type( in(1) ); |
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103 if (t == Type::TOP) return Type::TOP; |
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104 assert (t != TypePtr::NULL_PTR, "null klass?"); |
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105 |
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106 assert(UseCompressedClassPointers && t->isa_klassptr(), "only klass ptr here"); |
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107 return t->make_narrowklass(); |
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108 } |
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109 |