annotate src/share/vm/ci/ciInstanceKlass.hpp @ 17524:89152779163c

Merge with jdk8-b132
author Gilles Duboscq <duboscq@ssw.jku.at>
date Wed, 15 Oct 2014 11:59:32 +0200
parents 4ca6dc0799b6
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1 /*
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Gilles Duboscq <duboscq@ssw.jku.at>
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2 * Copyright (c) 1999, 2013, 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 #ifndef SHARE_VM_CI_CIINSTANCEKLASS_HPP
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26 #define SHARE_VM_CI_CIINSTANCEKLASS_HPP
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27
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28 #include "ci/ciConstantPoolCache.hpp"
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29 #include "ci/ciFlags.hpp"
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30 #include "ci/ciKlass.hpp"
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31 #include "ci/ciSymbol.hpp"
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32
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33 // ciInstanceKlass
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34 //
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35 // This class represents a Klass* in the HotSpot virtual machine
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36 // whose Klass part is an InstanceKlass. It may or may not
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37 // be loaded.
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38 class ciInstanceKlass : public ciKlass {
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39 CI_PACKAGE_ACCESS
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40 friend class ciBytecodeStream;
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41 friend class ciEnv;
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42 friend class ciExceptionHandler;
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43 friend class ciMethod;
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44 friend class ciField;
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45
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46 private:
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47 jobject _loader;
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48 jobject _protection_domain;
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49
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50 InstanceKlass::ClassState _init_state; // state of class
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51 bool _is_shared;
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52 bool _has_finalizer;
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53 bool _has_subklass;
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54 bool _has_nonstatic_fields;
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55 bool _has_default_methods;
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56
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57 ciFlags _flags;
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58 jint _nonstatic_field_size;
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59 jint _nonstatic_oop_map_size;
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60
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61 // Lazy fields get filled in only upon request.
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62 ciInstanceKlass* _super;
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63 ciInstance* _java_mirror;
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64
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65 ciConstantPoolCache* _field_cache; // cached map index->field
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66 GrowableArray<ciField*>* _nonstatic_fields;
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67
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68 // The possible values of the _implementor fall into following three cases:
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69 // NULL: no implementor.
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70 // A ciInstanceKlass that's not itself: one implementor.
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71 // Itsef: more than one implementors.
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72 ciInstanceKlass* _implementor;
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74 GrowableArray<ciField*>* _non_static_fields;
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75
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76 protected:
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77 ciInstanceKlass(KlassHandle h_k);
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78 ciInstanceKlass(ciSymbol* name, jobject loader, jobject protection_domain);
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79
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80 InstanceKlass* get_instanceKlass() const {
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81 return (InstanceKlass*)get_Klass();
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82 }
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83
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84 oop loader();
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85 jobject loader_handle();
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86
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87 oop protection_domain();
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88 jobject protection_domain_handle();
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89
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90 const char* type_string() { return "ciInstanceKlass"; }
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91
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92 bool is_in_package_impl(const char* packagename, int len);
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93
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94 void print_impl(outputStream* st);
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95
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96 ciConstantPoolCache* field_cache();
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97
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98 bool is_shared() { return _is_shared; }
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99
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100 void compute_shared_init_state();
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101 bool compute_shared_has_subklass();
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102 int compute_nonstatic_fields();
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103 GrowableArray<ciField*>* compute_nonstatic_fields_impl(GrowableArray<ciField*>* super_fields);
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104
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105 // Update the init_state for shared klasses
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106 void update_if_shared(InstanceKlass::ClassState expected) {
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107 if (_is_shared && _init_state != expected) {
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108 if (is_loaded()) compute_shared_init_state();
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109 }
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110 }
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111
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112 public:
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113 // Has this klass been initialized?
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114 bool is_initialized() {
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115 update_if_shared(InstanceKlass::fully_initialized);
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116 return _init_state == InstanceKlass::fully_initialized;
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117 }
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118 // Is this klass being initialized?
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119 bool is_being_initialized() {
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120 update_if_shared(InstanceKlass::being_initialized);
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121 return _init_state == InstanceKlass::being_initialized;
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122 }
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123 // Has this klass been linked?
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124 bool is_linked() {
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125 update_if_shared(InstanceKlass::linked);
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126 return _init_state >= InstanceKlass::linked;
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127 }
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128
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129 // General klass information.
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130 ciFlags flags() {
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131 assert(is_loaded(), "must be loaded");
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132 return _flags;
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133 }
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134 bool has_finalizer() {
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135 assert(is_loaded(), "must be loaded");
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136 return _has_finalizer; }
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137 bool has_subklass() {
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138 assert(is_loaded(), "must be loaded");
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139 if (_is_shared && !_has_subklass) {
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140 if (flags().is_final()) {
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141 return false;
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142 } else {
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143 return compute_shared_has_subklass();
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144 }
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145 }
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146 return _has_subklass;
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147 }
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148 jint size_helper() {
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149 return (Klass::layout_helper_size_in_bytes(layout_helper())
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150 >> LogHeapWordSize);
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151 }
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152 jint nonstatic_field_size() {
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153 assert(is_loaded(), "must be loaded");
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154 return _nonstatic_field_size; }
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155 jint has_nonstatic_fields() {
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156 assert(is_loaded(), "must be loaded");
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157 return _has_nonstatic_fields; }
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158 jint nonstatic_oop_map_size() {
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159 assert(is_loaded(), "must be loaded");
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160 return _nonstatic_oop_map_size; }
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161 ciInstanceKlass* super();
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162 jint nof_implementors() {
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163 ciInstanceKlass* impl;
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164 assert(is_loaded(), "must be loaded");
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165 impl = implementor();
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166 if (impl == NULL) {
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167 return 0;
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168 } else if (impl != this) {
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169 return 1;
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170 } else {
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171 return 2;
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172 }
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173 }
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174
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175 bool has_default_methods() {
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176 assert(is_loaded(), "must be loaded");
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177 return _has_default_methods;
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178 }
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179
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180 ciInstanceKlass* get_canonical_holder(int offset);
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181 ciField* get_field_by_offset(int field_offset, bool is_static);
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182 ciField* get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static);
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183
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184 GrowableArray<ciField*>* non_static_fields();
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185
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186 // total number of nonstatic fields (including inherited):
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187 int nof_nonstatic_fields() {
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188 if (_nonstatic_fields == NULL)
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189 return compute_nonstatic_fields();
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190 else
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191 return _nonstatic_fields->length();
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192 }
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193 // nth nonstatic field (presented by ascending address)
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194 ciField* nonstatic_field_at(int i) {
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195 assert(_nonstatic_fields != NULL, "");
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196 return _nonstatic_fields->at(i);
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197 }
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198
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199 ciInstanceKlass* unique_concrete_subklass();
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200 bool has_finalizable_subclass();
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201
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202 bool contains_field_offset(int offset) {
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203 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
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204 }
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205
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206 // Get the instance of java.lang.Class corresponding to
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207 // this klass. This instance is used for locking of
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208 // synchronized static methods of this klass.
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209 ciInstance* java_mirror();
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210
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211 // Java access flags
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212 bool is_public () { return flags().is_public(); }
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213 bool is_final () { return flags().is_final(); }
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214 bool is_super () { return flags().is_super(); }
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215 bool is_interface () { return flags().is_interface(); }
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216 bool is_abstract () { return flags().is_abstract(); }
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217
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218 ciMethod* find_method(ciSymbol* name, ciSymbol* signature);
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219 // Note: To find a method from name and type strings, use ciSymbol::make,
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220 // but consider adding to vmSymbols.hpp instead.
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221
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222 bool is_leaf_type();
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223 ciInstanceKlass* implementor();
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224
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225 // Is the defining class loader of this class the default loader?
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226 bool uses_default_loader() const;
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227
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228 bool is_java_lang_Object() const;
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229
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230 BasicType box_klass_type() const;
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231 bool is_box_klass() const;
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232 bool is_boxed_value_offset(int offset) const;
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233
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234 // Is this klass in the given package?
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235 bool is_in_package(const char* packagename) {
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236 return is_in_package(packagename, (int) strlen(packagename));
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237 }
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238 bool is_in_package(const char* packagename, int len);
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239
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240 // What kind of ciObject is this?
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241 bool is_instance_klass() const { return true; }
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242 bool is_java_klass() const { return true; }
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243
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244 virtual ciKlass* exact_klass() {
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245 if (is_loaded() && is_final() && !is_interface()) {
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246 return this;
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247 }
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248 return NULL;
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249 }
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250
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251 // Dump the current state of this klass for compilation replay.
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252 virtual void dump_replay_data(outputStream* out);
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253 };
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254
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255 #endif // SHARE_VM_CI_CIINSTANCEKLASS_HPP