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annotate src/share/vm/ci/ciInstanceKlass.cpp @ 2044:06f017f7daa7

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Merge.
author Thomas Wuerthinger <wuerthinger@ssw.jku.at>
date Fri, 07 Jan 2011 18:18:08 +0100
parents 2d26b0046e0d f95d63e2154a
children d25d4ca69222
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1 /*
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2 * Copyright (c) 1999, 2010, 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 "ci/ciField.hpp"
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27 #include "ci/ciInstance.hpp"
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28 #include "ci/ciInstanceKlass.hpp"
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29 #include "ci/ciUtilities.hpp"
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30 #include "classfile/systemDictionary.hpp"
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31 #include "memory/allocation.hpp"
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32 #include "memory/allocation.inline.hpp"
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33 #include "oops/oop.inline.hpp"
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34 #include "runtime/fieldDescriptor.hpp"
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35
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36 // ciInstanceKlass
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37 //
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38 // This class represents a klassOop in the HotSpot virtual machine
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39 // whose Klass part in an instanceKlass.
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40
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41 // ------------------------------------------------------------------
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42 // ciInstanceKlass::ciInstanceKlass
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43 //
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44 // Loaded instance klass.
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45 ciInstanceKlass::ciInstanceKlass(KlassHandle h_k) :
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46 ciKlass(h_k), _non_static_fields(NULL)
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47 {
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48 assert(get_Klass()->oop_is_instance(), "wrong type");
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49 instanceKlass* ik = get_instanceKlass();
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50
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51 AccessFlags access_flags = ik->access_flags();
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52 _flags = ciFlags(access_flags);
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53 _has_finalizer = access_flags.has_finalizer();
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54 _has_subklass = ik->subklass() != NULL;
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55 _init_state = (instanceKlass::ClassState)ik->get_init_state();
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56 _nonstatic_field_size = ik->nonstatic_field_size();
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57 _has_nonstatic_fields = ik->has_nonstatic_fields();
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58 _nonstatic_fields = NULL; // initialized lazily by compute_nonstatic_fields:
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59
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60 _nof_implementors = ik->nof_implementors();
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61 for (int i = 0; i < implementors_limit; i++) {
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62 _implementors[i] = NULL; // we will fill these lazily
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63 }
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64
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65 Thread *thread = Thread::current();
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66 if (ciObjectFactory::is_initialized() && !UseC1X) {
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67 _loader = JNIHandles::make_local(thread, ik->class_loader());
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68 _protection_domain = JNIHandles::make_local(thread, ik->protection_domain());
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69 _is_shared = false;
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70 } else {
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71 Handle h_loader(thread, ik->class_loader());
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72 Handle h_protection_domain(thread, ik->protection_domain());
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73 _loader = JNIHandles::make_global(h_loader);
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74 _protection_domain = JNIHandles::make_global(h_protection_domain);
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75 _is_shared = !ciObjectFactory::is_initialized();
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76 }
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77
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78 // Lazy fields get filled in only upon request.
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79 _super = NULL;
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80 _java_mirror = NULL;
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81
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82 if (is_shared()) {
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83 if (h_k() != SystemDictionary::Object_klass()) {
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84 super();
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85 }
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86 java_mirror();
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87 //compute_nonstatic_fields(); // done outside of constructor
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88 }
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89
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90 _field_cache = NULL;
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91 }
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92
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93 // Version for unloaded classes:
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94 ciInstanceKlass::ciInstanceKlass(ciSymbol* name,
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95 jobject loader, jobject protection_domain)
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96 : ciKlass(name, ciInstanceKlassKlass::make())
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97 {
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98 assert(name->byte_at(0) != '[', "not an instance klass");
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99 _init_state = (instanceKlass::ClassState)0;
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100 _nonstatic_field_size = -1;
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101 _has_nonstatic_fields = false;
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102 _nonstatic_fields = NULL;
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103 _nof_implementors = -1;
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104 _loader = loader;
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105 _protection_domain = protection_domain;
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106 _is_shared = false;
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107 _super = NULL;
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108 _java_mirror = NULL;
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109 _field_cache = NULL;
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110 }
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111
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112
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114 // ------------------------------------------------------------------
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115 // ciInstanceKlass::compute_shared_is_initialized
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116 void ciInstanceKlass::compute_shared_init_state() {
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117 GUARDED_VM_ENTRY(
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118 instanceKlass* ik = get_instanceKlass();
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119 _init_state = (instanceKlass::ClassState)ik->get_init_state();
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120 )
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121 }
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122
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123 // ------------------------------------------------------------------
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124 // ciInstanceKlass::compute_shared_has_subklass
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125 bool ciInstanceKlass::compute_shared_has_subklass() {
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126 GUARDED_VM_ENTRY(
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127 instanceKlass* ik = get_instanceKlass();
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128 _has_subklass = ik->subklass() != NULL;
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129 return _has_subklass;
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130 )
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131 }
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132
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133 // ------------------------------------------------------------------
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134 // ciInstanceKlass::compute_shared_nof_implementors
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135 int ciInstanceKlass::compute_shared_nof_implementors() {
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136 // We requery this property, since it is a very old ciObject.
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137 GUARDED_VM_ENTRY(
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138 instanceKlass* ik = get_instanceKlass();
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139 _nof_implementors = ik->nof_implementors();
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140 return _nof_implementors;
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141 )
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142 }
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143
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144 // ------------------------------------------------------------------
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145 // ciInstanceKlass::loader
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146 oop ciInstanceKlass::loader() {
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147 ASSERT_IN_VM;
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148 return JNIHandles::resolve(_loader);
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149 }
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150
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151 // ------------------------------------------------------------------
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152 // ciInstanceKlass::loader_handle
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153 jobject ciInstanceKlass::loader_handle() {
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154 return _loader;
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155 }
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156
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157 // ------------------------------------------------------------------
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158 // ciInstanceKlass::protection_domain
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159 oop ciInstanceKlass::protection_domain() {
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160 ASSERT_IN_VM;
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161 return JNIHandles::resolve(_protection_domain);
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162 }
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163
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164 // ------------------------------------------------------------------
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165 // ciInstanceKlass::protection_domain_handle
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166 jobject ciInstanceKlass::protection_domain_handle() {
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167 return _protection_domain;
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168 }
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169
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170 // ------------------------------------------------------------------
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171 // ciInstanceKlass::field_cache
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172 //
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173 // Get the field cache associated with this klass.
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174 ciConstantPoolCache* ciInstanceKlass::field_cache() {
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175 if (is_shared()) {
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176 return NULL;
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177 }
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178 if (_field_cache == NULL) {
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179 assert(!is_java_lang_Object(), "Object has no fields");
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180 Arena* arena = CURRENT_ENV->arena();
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181 _field_cache = new (arena) ciConstantPoolCache(arena, 5);
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182 }
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183 return _field_cache;
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184 }
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185
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186 // ------------------------------------------------------------------
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187 // ciInstanceKlass::get_canonical_holder
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188 //
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189 ciInstanceKlass* ciInstanceKlass::get_canonical_holder(int offset) {
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190 #ifdef ASSERT
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191 if (!(offset >= 0 && offset < layout_helper())) {
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192 tty->print("*** get_canonical_holder(%d) on ", offset);
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193 this->print();
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194 tty->print_cr(" ***");
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195 };
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196 assert(offset >= 0 && offset < layout_helper(), "offset must be tame");
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197 #endif
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198
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199 if (offset < instanceOopDesc::base_offset_in_bytes()) {
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200 // All header offsets belong properly to java/lang/Object.
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201 return CURRENT_ENV->Object_klass();
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202 }
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203
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204 ciInstanceKlass* self = this;
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205 for (;;) {
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206 assert(self->is_loaded(), "must be loaded to have size");
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207 ciInstanceKlass* super = self->super();
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208 if (super == NULL || super->nof_nonstatic_fields() == 0 ||
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209 !super->contains_field_offset(offset)) {
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210 return self;
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211 } else {
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212 self = super; // return super->get_canonical_holder(offset)
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213 }
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214 }
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215 }
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216
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217 // ------------------------------------------------------------------
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218 // ciInstanceKlass::is_java_lang_Object
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219 //
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220 // Is this klass java.lang.Object?
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221 bool ciInstanceKlass::is_java_lang_Object() {
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222 return equals(CURRENT_ENV->Object_klass());
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223 }
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224
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225 // ------------------------------------------------------------------
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226 // ciInstanceKlass::uses_default_loader
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227 bool ciInstanceKlass::uses_default_loader() {
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228 // Note: We do not need to resolve the handle or enter the VM
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229 // in order to test null-ness.
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230 return _loader == NULL;
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231 }
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232
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233 // ------------------------------------------------------------------
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234 // ciInstanceKlass::is_in_package
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235 //
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236 // Is this klass in the given package?
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237 bool ciInstanceKlass::is_in_package(const char* packagename, int len) {
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238 // To avoid class loader mischief, this test always rejects application classes.
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239 if (!uses_default_loader())
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240 return false;
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241 GUARDED_VM_ENTRY(
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242 return is_in_package_impl(packagename, len);
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243 )
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244 }
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245
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246 bool ciInstanceKlass::is_in_package_impl(const char* packagename, int len) {
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247 ASSERT_IN_VM;
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248
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249 // If packagename contains trailing '/' exclude it from the
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250 // prefix-test since we test for it explicitly.
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251 if (packagename[len - 1] == '/')
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252 len--;
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253
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254 if (!name()->starts_with(packagename, len))
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255 return false;
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256
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257 // Test if the class name is something like "java/lang".
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258 if ((len + 1) > name()->utf8_length())
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259 return false;
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260
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261 // Test for trailing '/'
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262 if ((char) name()->byte_at(len) != '/')
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263 return false;
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264
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265 // Make sure it's not actually in a subpackage:
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266 if (name()->index_of_at(len+1, "/", 1) >= 0)
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267 return false;
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268
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269 return true;
0
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270 }
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271
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272 // ------------------------------------------------------------------
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273 // ciInstanceKlass::print_impl
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274 //
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275 // Implementation of the print method.
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276 void ciInstanceKlass::print_impl(outputStream* st) {
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277 ciKlass::print_impl(st);
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278 GUARDED_VM_ENTRY(st->print(" loader=0x%x", (address)loader());)
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279 if (is_loaded()) {
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280 st->print(" loaded=true initialized=%s finalized=%s subklass=%s size=%d flags=",
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281 bool_to_str(is_initialized()),
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282 bool_to_str(has_finalizer()),
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283 bool_to_str(has_subklass()),
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284 layout_helper());
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285
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286 _flags.print_klass_flags();
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287
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288 if (_super) {
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289 st->print(" super=");
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290 _super->print_name();
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291 }
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292 if (_java_mirror) {
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293 st->print(" mirror=PRESENT");
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294 }
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295 } else {
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296 st->print(" loaded=false");
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297 }
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298 }
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299
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300 // ------------------------------------------------------------------
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301 // ciInstanceKlass::super
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302 //
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303 // Get the superklass of this klass.
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304 ciInstanceKlass* ciInstanceKlass::super() {
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305 assert(is_loaded(), "must be loaded");
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306 if (_super == NULL && !is_java_lang_Object()) {
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307 GUARDED_VM_ENTRY(
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308 klassOop super_klass = get_instanceKlass()->super();
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309 _super = CURRENT_ENV->get_object(super_klass)->as_instance_klass();
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310 )
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311 }
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312 return _super;
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313 }
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314
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315 // ------------------------------------------------------------------
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316 // ciInstanceKlass::java_mirror
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317 //
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318 // Get the instance of java.lang.Class corresponding to this klass.
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319 // Cache it on this->_java_mirror.
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320 ciInstance* ciInstanceKlass::java_mirror() {
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321 if (_java_mirror == NULL) {
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322 _java_mirror = ciKlass::java_mirror();
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323 }
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324 return _java_mirror;
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325 }
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326
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327 // ------------------------------------------------------------------
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328 // ciInstanceKlass::unique_concrete_subklass
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329 ciInstanceKlass* ciInstanceKlass::unique_concrete_subklass() {
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330 if (!is_loaded()) return NULL; // No change if class is not loaded
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331 if (!is_abstract()) return NULL; // Only applies to abstract classes.
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332 if (!has_subklass()) return NULL; // Must have at least one subklass.
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333 VM_ENTRY_MARK;
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334 instanceKlass* ik = get_instanceKlass();
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335 Klass* up = ik->up_cast_abstract();
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336 assert(up->oop_is_instance(), "must be instanceKlass");
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337 if (ik == up) {
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338 return NULL;
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339 }
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340 return CURRENT_THREAD_ENV->get_object(up->as_klassOop())->as_instance_klass();
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341 }
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342
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343 // ------------------------------------------------------------------
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344 // ciInstanceKlass::has_finalizable_subclass
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345 bool ciInstanceKlass::has_finalizable_subclass() {
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346 if (!is_loaded()) return true;
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347 VM_ENTRY_MARK;
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348 return Dependencies::find_finalizable_subclass(get_instanceKlass()) != NULL;
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349 }
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350
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351 // ------------------------------------------------------------------
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352 // ciInstanceKlass::get_field_by_offset
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353 ciField* ciInstanceKlass::get_field_by_offset(int field_offset, bool is_static) {
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354 if (!is_static) {
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355 for (int i = 0, len = nof_nonstatic_fields(); i < len; i++) {
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356 ciField* field = _nonstatic_fields->at(i);
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357 int field_off = field->offset_in_bytes();
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358 if (field_off == field_offset)
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359 return field;
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360 if (field_off > field_offset)
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361 break;
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362 // could do binary search or check bins, but probably not worth it
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363 }
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364 return NULL;
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365 }
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366 VM_ENTRY_MARK;
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367 instanceKlass* k = get_instanceKlass();
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368 fieldDescriptor fd;
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369 if (!k->find_field_from_offset(field_offset, is_static, &fd)) {
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370 return NULL;
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371 }
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372 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
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373 return field;
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374 }
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375
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376 // ------------------------------------------------------------------
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377 // ciInstanceKlass::get_field_by_name
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378 ciField* ciInstanceKlass::get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static) {
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379 VM_ENTRY_MARK;
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380 instanceKlass* k = get_instanceKlass();
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381 fieldDescriptor fd;
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382 klassOop def = k->find_field(name->get_symbolOop(), signature->get_symbolOop(), is_static, &fd);
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diff changeset
383 if (def == NULL) {
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diff changeset
384 return NULL;
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diff changeset
385 }
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386 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
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387 return field;
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388 }
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389
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390 // ------------------------------------------------------------------
44
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391 // ciInstanceKlass::non_static_fields.
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392
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393 class NonStaticFieldFiller: public FieldClosure {
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394 GrowableArray<ciField*>* _arr;
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395 ciEnv* _curEnv;
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396 public:
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397 NonStaticFieldFiller(ciEnv* curEnv, GrowableArray<ciField*>* arr) :
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398 _curEnv(curEnv), _arr(arr)
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399 {}
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400 void do_field(fieldDescriptor* fd) {
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401 ciField* field = new (_curEnv->arena()) ciField(fd);
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402 _arr->append(field);
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403 }
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404 };
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405
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406 GrowableArray<ciField*>* ciInstanceKlass::non_static_fields() {
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407 if (_non_static_fields == NULL) {
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408 VM_ENTRY_MARK;
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409 ciEnv* curEnv = ciEnv::current();
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410 instanceKlass* ik = get_instanceKlass();
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parents: 0
diff changeset
411 int max_n_fields = ik->fields()->length()/instanceKlass::next_offset;
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kvn
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diff changeset
412
1685
0e35fa8ebccd 6973963: SEGV in ciBlock::start_bci() with EA
kvn
parents: 1645
diff changeset
413 Arena* arena = curEnv->arena();
44
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kvn
parents: 0
diff changeset
414 _non_static_fields =
1685
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kvn
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diff changeset
415 new (arena) GrowableArray<ciField*>(arena, max_n_fields, 0, NULL);
44
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kvn
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diff changeset
416 NonStaticFieldFiller filler(curEnv, _non_static_fields);
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417 ik->do_nonstatic_fields(&filler);
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parents: 0
diff changeset
418 }
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419 return _non_static_fields;
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diff changeset
420 }
52fed2ec0afb 6667620: (Escape Analysis) fix deoptimization for scalar replaced objects
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421
0
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422 static int sort_field_by_offset(ciField** a, ciField** b) {
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423 return (*a)->offset_in_bytes() - (*b)->offset_in_bytes();
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424 // (no worries about 32-bit overflow...)
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425 }
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426
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parents:
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427 // ------------------------------------------------------------------
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428 // ciInstanceKlass::compute_nonstatic_fields
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429 int ciInstanceKlass::compute_nonstatic_fields() {
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430 assert(is_loaded(), "must be loaded");
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431
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432 if (_nonstatic_fields != NULL)
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433 return _nonstatic_fields->length();
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434
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diff changeset
435 if (!has_nonstatic_fields()) {
0
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436 Arena* arena = CURRENT_ENV->arena();
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437 _nonstatic_fields = new (arena) GrowableArray<ciField*>(arena, 0, 0, NULL);
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438 return 0;
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439 }
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diff changeset
440 assert(!is_java_lang_Object(), "bootstrap OK");
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441
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442 // Size in bytes of my fields, including inherited fields.
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443 int fsize = nonstatic_field_size() * heapOopSize;
113
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444
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445 ciInstanceKlass* super = this->super();
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446 GrowableArray<ciField*>* super_fields = NULL;
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447 if (super != NULL && super->has_nonstatic_fields()) {
165
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448 int super_fsize = super->nonstatic_field_size() * heapOopSize;
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449 int super_flen = super->nof_nonstatic_fields();
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450 super_fields = super->_nonstatic_fields;
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451 assert(super_flen == 0 || super_fields != NULL, "first get nof_fields");
113
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452 // See if I am no larger than my super; if so, I can use his fields.
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453 if (fsize == super_fsize) {
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diff changeset
454 _nonstatic_fields = super_fields;
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455 return super_fields->length();
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456 }
0
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457 }
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458
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459 GrowableArray<ciField*>* fields = NULL;
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parents:
diff changeset
460 GUARDED_VM_ENTRY({
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461 fields = compute_nonstatic_fields_impl(super_fields);
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462 });
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463
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464 if (fields == NULL) {
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465 // This can happen if this class (java.lang.Class) has invisible fields.
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466 _nonstatic_fields = super_fields;
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467 return super_fields->length();
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468 }
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469
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470 int flen = fields->length();
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471
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472 // Now sort them by offset, ascending.
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473 // (In principle, they could mix with superclass fields.)
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474 fields->sort(sort_field_by_offset);
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475 #ifdef ASSERT
113
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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476 int last_offset = instanceOopDesc::base_offset_in_bytes();
0
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477 for (int i = 0; i < fields->length(); i++) {
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478 ciField* field = fields->at(i);
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479 int offset = field->offset_in_bytes();
113
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diff changeset
480 int size = (field->_type == NULL) ? heapOopSize : field->size_in_bytes();
1846
d55217dc206f 6829194: JSR 292 needs to support compressed oops
twisti
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diff changeset
481 assert(last_offset <= offset, err_msg("no field overlap: %d <= %d", last_offset, offset));
0
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482 if (last_offset > (int)sizeof(oopDesc))
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483 assert((offset - last_offset) < BytesPerLong, "no big holes");
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484 // Note: Two consecutive T_BYTE fields will be separated by wordSize-1
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485 // padding bytes if one of them is declared by a superclass.
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parents:
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486 // This is a minor inefficiency classFileParser.cpp.
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487 last_offset = offset + size;
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488 }
165
437d03ea40b1 6703888: Compressed Oops: use the 32-bits gap after klass in a object
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diff changeset
489 assert(last_offset <= (int)instanceOopDesc::base_offset_in_bytes() + fsize, "no overflow");
0
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490 #endif
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491
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492 _nonstatic_fields = fields;
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493 return flen;
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494 }
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495
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496 GrowableArray<ciField*>*
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diff changeset
497 ciInstanceKlass::compute_nonstatic_fields_impl(GrowableArray<ciField*>*
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498 super_fields) {
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499 ASSERT_IN_VM;
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500 Arena* arena = CURRENT_ENV->arena();
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501 int flen = 0;
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502 GrowableArray<ciField*>* fields = NULL;
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503 instanceKlass* k = get_instanceKlass();
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504 typeArrayOop fields_array = k->fields();
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diff changeset
505 for (int pass = 0; pass <= 1; pass++) {
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506 for (int i = 0, alen = fields_array->length(); i < alen; i += instanceKlass::next_offset) {
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diff changeset
507 fieldDescriptor fd;
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diff changeset
508 fd.initialize(k->as_klassOop(), i);
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509 if (fd.is_static()) continue;
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510 if (pass == 0) {
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511 flen += 1;
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512 } else {
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diff changeset
513 ciField* field = new (arena) ciField(&fd);
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514 fields->append(field);
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515 }
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diff changeset
516 }
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diff changeset
517
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518 // Between passes, allocate the array:
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parents:
diff changeset
519 if (pass == 0) {
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520 if (flen == 0) {
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521 return NULL; // return nothing if none are locally declared
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parents:
diff changeset
522 }
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523 if (super_fields != NULL) {
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diff changeset
524 flen += super_fields->length();
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525 }
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diff changeset
526 fields = new (arena) GrowableArray<ciField*>(arena, flen, 0, NULL);
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parents:
diff changeset
527 if (super_fields != NULL) {
a61af66fc99e Initial load
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diff changeset
528 fields->appendAll(super_fields);
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diff changeset
529 }
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diff changeset
530 }
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parents:
diff changeset
531 }
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diff changeset
532 assert(fields->length() == flen, "sanity");
a61af66fc99e Initial load
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diff changeset
533 return fields;
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diff changeset
534 }
a61af66fc99e Initial load
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diff changeset
535
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diff changeset
536 // ------------------------------------------------------------------
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parents:
diff changeset
537 // ciInstanceKlass::find_method
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diff changeset
538 //
a61af66fc99e Initial load
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parents:
diff changeset
539 // Find a method in this klass.
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parents:
diff changeset
540 ciMethod* ciInstanceKlass::find_method(ciSymbol* name, ciSymbol* signature) {
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diff changeset
541 VM_ENTRY_MARK;
a61af66fc99e Initial load
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parents:
diff changeset
542 instanceKlass* k = get_instanceKlass();
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parents:
diff changeset
543 symbolOop name_sym = name->get_symbolOop();
a61af66fc99e Initial load
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diff changeset
544 symbolOop sig_sym= signature->get_symbolOop();
a61af66fc99e Initial load
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diff changeset
545
a61af66fc99e Initial load
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diff changeset
546 methodOop m = k->find_method(name_sym, sig_sym);
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diff changeset
547 if (m == NULL) return NULL;
a61af66fc99e Initial load
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parents:
diff changeset
548
a61af66fc99e Initial load
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parents:
diff changeset
549 return CURRENT_THREAD_ENV->get_object(m)->as_method();
a61af66fc99e Initial load
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parents:
diff changeset
550 }
a61af66fc99e Initial load
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parents:
diff changeset
551
a61af66fc99e Initial load
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parents:
diff changeset
552 // ------------------------------------------------------------------
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parents:
diff changeset
553 // ciInstanceKlass::is_leaf_type
a61af66fc99e Initial load
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parents:
diff changeset
554 bool ciInstanceKlass::is_leaf_type() {
a61af66fc99e Initial load
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parents:
diff changeset
555 assert(is_loaded(), "must be loaded");
a61af66fc99e Initial load
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parents:
diff changeset
556 if (is_shared()) {
a61af66fc99e Initial load
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parents:
diff changeset
557 return is_final(); // approximately correct
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parents:
diff changeset
558 } else {
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parents:
diff changeset
559 return !_has_subklass && (_nof_implementors == 0);
a61af66fc99e Initial load
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parents:
diff changeset
560 }
a61af66fc99e Initial load
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parents:
diff changeset
561 }
a61af66fc99e Initial load
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diff changeset
562
a61af66fc99e Initial load
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parents:
diff changeset
563 // ------------------------------------------------------------------
a61af66fc99e Initial load
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diff changeset
564 // ciInstanceKlass::implementor
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diff changeset
565 //
a61af66fc99e Initial load
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parents:
diff changeset
566 // Report an implementor of this interface.
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parents:
diff changeset
567 // Returns NULL if exact information is not available.
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parents:
diff changeset
568 // Note that there are various races here, since my copy
a61af66fc99e Initial load
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parents:
diff changeset
569 // of _nof_implementors might be out of date with respect
a61af66fc99e Initial load
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parents:
diff changeset
570 // to results returned by instanceKlass::implementor.
a61af66fc99e Initial load
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parents:
diff changeset
571 // This is OK, since any dependencies we decide to assert
a61af66fc99e Initial load
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parents:
diff changeset
572 // will be checked later under the Compile_lock.
a61af66fc99e Initial load
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parents:
diff changeset
573 ciInstanceKlass* ciInstanceKlass::implementor(int n) {
1924
b0e6879e48fa 6839891: Array overrun in vm ci
kvn
parents: 1846
diff changeset
574 if (n >= implementors_limit) {
0
a61af66fc99e Initial load
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parents:
diff changeset
575 return NULL;
a61af66fc99e Initial load
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parents:
diff changeset
576 }
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parents:
diff changeset
577 ciInstanceKlass* impl = _implementors[n];
a61af66fc99e Initial load
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parents:
diff changeset
578 if (impl == NULL) {
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parents:
diff changeset
579 if (_nof_implementors > implementors_limit) {
a61af66fc99e Initial load
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parents:
diff changeset
580 return NULL;
a61af66fc99e Initial load
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parents:
diff changeset
581 }
a61af66fc99e Initial load
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parents:
diff changeset
582 // Go into the VM to fetch the implementor.
a61af66fc99e Initial load
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parents:
diff changeset
583 {
a61af66fc99e Initial load
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parents:
diff changeset
584 VM_ENTRY_MARK;
a61af66fc99e Initial load
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parents:
diff changeset
585 klassOop k = get_instanceKlass()->implementor(n);
a61af66fc99e Initial load
duke
parents:
diff changeset
586 if (k != NULL) {
a61af66fc99e Initial load
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parents:
diff changeset
587 impl = CURRENT_THREAD_ENV->get_object(k)->as_instance_klass();
a61af66fc99e Initial load
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parents:
diff changeset
588 }
a61af66fc99e Initial load
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parents:
diff changeset
589 }
a61af66fc99e Initial load
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parents:
diff changeset
590 // Memoize this result.
a61af66fc99e Initial load
duke
parents:
diff changeset
591 if (!is_shared()) {
a61af66fc99e Initial load
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parents:
diff changeset
592 _implementors[n] = (impl == NULL)? this: impl;
a61af66fc99e Initial load
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parents:
diff changeset
593 }
a61af66fc99e Initial load
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parents:
diff changeset
594 } else if (impl == this) {
a61af66fc99e Initial load
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parents:
diff changeset
595 impl = NULL; // memoized null result from a VM query
a61af66fc99e Initial load
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parents:
diff changeset
596 }
a61af66fc99e Initial load
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parents:
diff changeset
597 return impl;
a61af66fc99e Initial load
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parents:
diff changeset
598 }