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annotate src/share/vm/utilities/constantTag.cpp @ 20543:e7d0505c8a30

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8059758: Footprint regressions with JDK-8038423 Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything. Reviewed-by: jwilhelm, brutisso
author tschatzl
date Fri, 10 Oct 2014 15:51:58 +0200
parents 78bbf4d43a14
children
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1 /*
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2 * Copyright (c) 1997, 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 "utilities/constantTag.hpp"
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27
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28 #ifndef PRODUCT
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29
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30 void constantTag::print_on(outputStream* st) const {
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31 st->print("%s", internal_name());
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32 }
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34 #endif // PRODUCT
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35
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36 BasicType constantTag::basic_type() const {
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37 switch (_tag) {
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38 case JVM_CONSTANT_Integer :
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39 return T_INT;
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40 case JVM_CONSTANT_Float :
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41 return T_FLOAT;
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42 case JVM_CONSTANT_Long :
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43 return T_LONG;
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44 case JVM_CONSTANT_Double :
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45 return T_DOUBLE;
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46
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47 case JVM_CONSTANT_Class :
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48 case JVM_CONSTANT_String :
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49 case JVM_CONSTANT_UnresolvedClass :
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50 case JVM_CONSTANT_UnresolvedClassInError :
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51 case JVM_CONSTANT_ClassIndex :
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52 case JVM_CONSTANT_StringIndex :
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53 case JVM_CONSTANT_MethodHandle :
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54 case JVM_CONSTANT_MethodHandleInError :
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55 case JVM_CONSTANT_MethodType :
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56 case JVM_CONSTANT_MethodTypeInError :
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57 return T_OBJECT;
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58 default:
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59 ShouldNotReachHere();
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60 return T_ILLEGAL;
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61 }
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62 }
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63
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64
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65 jbyte constantTag::non_error_value() const {
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66 switch (_tag) {
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67 case JVM_CONSTANT_UnresolvedClassInError:
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68 return JVM_CONSTANT_UnresolvedClass;
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69 case JVM_CONSTANT_MethodHandleInError:
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70 return JVM_CONSTANT_MethodHandle;
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71 case JVM_CONSTANT_MethodTypeInError:
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72 return JVM_CONSTANT_MethodType;
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73 default:
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74 return _tag;
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75 }
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76 }
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77
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79 const char* constantTag::internal_name() const {
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80 switch (_tag) {
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81 case JVM_CONSTANT_Invalid :
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82 return "Invalid index";
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83 case JVM_CONSTANT_Class :
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84 return "Class";
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85 case JVM_CONSTANT_Fieldref :
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86 return "Field";
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87 case JVM_CONSTANT_Methodref :
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88 return "Method";
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89 case JVM_CONSTANT_InterfaceMethodref :
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90 return "InterfaceMethod";
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91 case JVM_CONSTANT_String :
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92 return "String";
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93 case JVM_CONSTANT_Integer :
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94 return "Integer";
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95 case JVM_CONSTANT_Float :
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96 return "Float";
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97 case JVM_CONSTANT_Long :
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98 return "Long";
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99 case JVM_CONSTANT_Double :
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100 return "Double";
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101 case JVM_CONSTANT_NameAndType :
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102 return "NameAndType";
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103 case JVM_CONSTANT_MethodHandle :
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104 return "MethodHandle";
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105 case JVM_CONSTANT_MethodHandleInError :
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106 return "MethodHandle Error";
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107 case JVM_CONSTANT_MethodType :
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108 return "MethodType";
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109 case JVM_CONSTANT_MethodTypeInError :
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110 return "MethodType Error";
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111 case JVM_CONSTANT_InvokeDynamic :
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112 return "InvokeDynamic";
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113 case JVM_CONSTANT_Utf8 :
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114 return "Utf8";
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115 case JVM_CONSTANT_UnresolvedClass :
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116 return "Unresolved Class";
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117 case JVM_CONSTANT_UnresolvedClassInError :
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118 return "Unresolved Class Error";
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119 case JVM_CONSTANT_ClassIndex :
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120 return "Unresolved Class Index";
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121 case JVM_CONSTANT_StringIndex :
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122 return "Unresolved String Index";
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123 default:
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124 ShouldNotReachHere();
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125 return "Illegal";
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126 }
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127 }