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annotate src/share/vm/ci/ciInstanceKlass.cpp @ 1602:136b78722a08

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6939203: JSR 292 needs method handle constants Summary: Add new CP types CONSTANT_MethodHandle, CONSTANT_MethodType; extend 'ldc' bytecode. Reviewed-by: twisti, never
author jrose
date Wed, 09 Jun 2010 18:50:45 -0700
parents c18cbe5936b8
children b918d354830a
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1 /*
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2 * Copyright (c) 1999, 2008, 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 "incls/_precompiled.incl"
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26 #include "incls/_ciInstanceKlass.cpp.incl"
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27
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28 // ciInstanceKlass
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29 //
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30 // This class represents a klassOop in the HotSpot virtual machine
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31 // whose Klass part in an instanceKlass.
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32
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33 // ------------------------------------------------------------------
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34 // ciInstanceKlass::ciInstanceKlass
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35 //
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36 // Loaded instance klass.
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37 ciInstanceKlass::ciInstanceKlass(KlassHandle h_k) :
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38 ciKlass(h_k), _non_static_fields(NULL)
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39 {
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40 assert(get_Klass()->oop_is_instance(), "wrong type");
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41 instanceKlass* ik = get_instanceKlass();
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42
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43 AccessFlags access_flags = ik->access_flags();
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44 _flags = ciFlags(access_flags);
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45 _has_finalizer = access_flags.has_finalizer();
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46 _has_subklass = ik->subklass() != NULL;
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47 _is_initialized = ik->is_initialized();
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48 // Next line must follow and use the result of the previous line:
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49 _is_linked = _is_initialized || ik->is_linked();
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50 _nonstatic_field_size = ik->nonstatic_field_size();
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51 _has_nonstatic_fields = ik->has_nonstatic_fields();
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52 _nonstatic_fields = NULL; // initialized lazily by compute_nonstatic_fields:
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53
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54 _nof_implementors = ik->nof_implementors();
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55 for (int i = 0; i < implementors_limit; i++) {
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56 _implementors[i] = NULL; // we will fill these lazily
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57 }
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58
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59 Thread *thread = Thread::current();
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60 if (ciObjectFactory::is_initialized()) {
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61 _loader = JNIHandles::make_local(thread, ik->class_loader());
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62 _protection_domain = JNIHandles::make_local(thread,
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63 ik->protection_domain());
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64 _is_shared = false;
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65 } else {
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66 Handle h_loader(thread, ik->class_loader());
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67 Handle h_protection_domain(thread, ik->protection_domain());
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68 _loader = JNIHandles::make_global(h_loader);
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69 _protection_domain = JNIHandles::make_global(h_protection_domain);
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70 _is_shared = true;
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71 }
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72
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73 // Lazy fields get filled in only upon request.
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74 _super = NULL;
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75 _java_mirror = NULL;
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76
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77 if (is_shared()) {
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78 if (h_k() != SystemDictionary::Object_klass()) {
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79 super();
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80 }
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81 java_mirror();
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82 //compute_nonstatic_fields(); // done outside of constructor
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83 }
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84
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85 _field_cache = NULL;
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86 }
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87
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88 // Version for unloaded classes:
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89 ciInstanceKlass::ciInstanceKlass(ciSymbol* name,
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90 jobject loader, jobject protection_domain)
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91 : ciKlass(name, ciInstanceKlassKlass::make())
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92 {
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93 assert(name->byte_at(0) != '[', "not an instance klass");
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94 _is_initialized = false;
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95 _is_linked = false;
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96 _nonstatic_field_size = -1;
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97 _has_nonstatic_fields = false;
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98 _nonstatic_fields = NULL;
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99 _nof_implementors = -1;
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100 _loader = loader;
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101 _protection_domain = protection_domain;
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102 _is_shared = false;
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103 _super = NULL;
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104 _java_mirror = NULL;
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105 _field_cache = NULL;
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106 }
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107
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108
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109
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110 // ------------------------------------------------------------------
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111 // ciInstanceKlass::compute_shared_is_initialized
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112 bool ciInstanceKlass::compute_shared_is_initialized() {
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113 GUARDED_VM_ENTRY(
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114 instanceKlass* ik = get_instanceKlass();
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115 _is_initialized = ik->is_initialized();
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116 return _is_initialized;
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117 )
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118 }
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119
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120 // ------------------------------------------------------------------
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121 // ciInstanceKlass::compute_shared_is_linked
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122 bool ciInstanceKlass::compute_shared_is_linked() {
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123 GUARDED_VM_ENTRY(
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124 instanceKlass* ik = get_instanceKlass();
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125 _is_linked = ik->is_linked();
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126 return _is_linked;
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127 )
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128 }
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129
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130 // ------------------------------------------------------------------
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131 // ciInstanceKlass::compute_shared_has_subklass
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132 bool ciInstanceKlass::compute_shared_has_subklass() {
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133 GUARDED_VM_ENTRY(
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134 instanceKlass* ik = get_instanceKlass();
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135 _has_subklass = ik->subklass() != NULL;
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136 return _has_subklass;
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137 )
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138 }
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139
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140 // ------------------------------------------------------------------
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141 // ciInstanceKlass::compute_shared_nof_implementors
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142 int ciInstanceKlass::compute_shared_nof_implementors() {
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143 // We requery this property, since it is a very old ciObject.
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144 GUARDED_VM_ENTRY(
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145 instanceKlass* ik = get_instanceKlass();
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146 _nof_implementors = ik->nof_implementors();
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147 return _nof_implementors;
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148 )
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149 }
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150
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151 // ------------------------------------------------------------------
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152 // ciInstanceKlass::loader
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153 oop ciInstanceKlass::loader() {
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154 ASSERT_IN_VM;
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155 return JNIHandles::resolve(_loader);
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156 }
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157
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158 // ------------------------------------------------------------------
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159 // ciInstanceKlass::loader_handle
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160 jobject ciInstanceKlass::loader_handle() {
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161 return _loader;
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162 }
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163
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164 // ------------------------------------------------------------------
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165 // ciInstanceKlass::protection_domain
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166 oop ciInstanceKlass::protection_domain() {
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167 ASSERT_IN_VM;
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168 return JNIHandles::resolve(_protection_domain);
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169 }
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170
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171 // ------------------------------------------------------------------
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172 // ciInstanceKlass::protection_domain_handle
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173 jobject ciInstanceKlass::protection_domain_handle() {
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174 return _protection_domain;
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175 }
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176
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177 // ------------------------------------------------------------------
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178 // ciInstanceKlass::field_cache
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179 //
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180 // Get the field cache associated with this klass.
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181 ciConstantPoolCache* ciInstanceKlass::field_cache() {
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182 if (is_shared()) {
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183 return NULL;
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184 }
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185 if (_field_cache == NULL) {
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186 assert(!is_java_lang_Object(), "Object has no fields");
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187 Arena* arena = CURRENT_ENV->arena();
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188 _field_cache = new (arena) ciConstantPoolCache(arena, 5);
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189 }
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190 return _field_cache;
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191 }
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192
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193 // ------------------------------------------------------------------
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194 // ciInstanceKlass::get_canonical_holder
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195 //
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196 ciInstanceKlass* ciInstanceKlass::get_canonical_holder(int offset) {
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197 #ifdef ASSERT
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198 if (!(offset >= 0 && offset < layout_helper())) {
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199 tty->print("*** get_canonical_holder(%d) on ", offset);
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200 this->print();
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201 tty->print_cr(" ***");
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202 };
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203 assert(offset >= 0 && offset < layout_helper(), "offset must be tame");
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204 #endif
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205
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206 if (offset < instanceOopDesc::base_offset_in_bytes()) {
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207 // All header offsets belong properly to java/lang/Object.
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208 return CURRENT_ENV->Object_klass();
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209 }
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210
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211 ciInstanceKlass* self = this;
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212 for (;;) {
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213 assert(self->is_loaded(), "must be loaded to have size");
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214 ciInstanceKlass* super = self->super();
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215 if (super == NULL || super->nof_nonstatic_fields() == 0 ||
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216 !super->contains_field_offset(offset)) {
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217 return self;
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218 } else {
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219 self = super; // return super->get_canonical_holder(offset)
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220 }
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221 }
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222 }
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223
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224 // ------------------------------------------------------------------
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225 // ciInstanceKlass::is_java_lang_Object
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226 //
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227 // Is this klass java.lang.Object?
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228 bool ciInstanceKlass::is_java_lang_Object() {
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229 return equals(CURRENT_ENV->Object_klass());
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230 }
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231
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232 // ------------------------------------------------------------------
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233 // ciInstanceKlass::uses_default_loader
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234 bool ciInstanceKlass::uses_default_loader() {
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235 // Note: We do not need to resolve the handle or enter the VM
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236 // in order to test null-ness.
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237 return _loader == NULL;
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238 }
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239
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240 // ------------------------------------------------------------------
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241 // ciInstanceKlass::is_in_package
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242 //
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243 // Is this klass in the given package?
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244 bool ciInstanceKlass::is_in_package(const char* packagename, int len) {
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245 // To avoid class loader mischief, this test always rejects application classes.
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246 if (!uses_default_loader())
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247 return false;
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248 GUARDED_VM_ENTRY(
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249 return is_in_package_impl(packagename, len);
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250 )
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251 }
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252
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253 bool ciInstanceKlass::is_in_package_impl(const char* packagename, int len) {
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254 ASSERT_IN_VM;
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255
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256 // If packagename contains trailing '/' exclude it from the
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257 // prefix-test since we test for it explicitly.
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258 if (packagename[len - 1] == '/')
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259 len--;
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260
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261 if (!name()->starts_with(packagename, len))
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262 return false;
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263
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264 // Test if the class name is something like "java/lang".
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265 if ((len + 1) > name()->utf8_length())
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266 return false;
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267
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268 // Test for trailing '/'
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269 if ((char) name()->byte_at(len) != '/')
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270 return false;
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271
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272 // Make sure it's not actually in a subpackage:
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273 if (name()->index_of_at(len+1, "/", 1) >= 0)
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274 return false;
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275
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276 return true;
0
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277 }
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278
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279 // ------------------------------------------------------------------
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280 // ciInstanceKlass::print_impl
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281 //
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282 // Implementation of the print method.
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283 void ciInstanceKlass::print_impl(outputStream* st) {
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284 ciKlass::print_impl(st);
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285 GUARDED_VM_ENTRY(st->print(" loader=0x%x", (address)loader());)
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286 if (is_loaded()) {
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287 st->print(" loaded=true initialized=%s finalized=%s subklass=%s size=%d flags=",
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288 bool_to_str(is_initialized()),
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289 bool_to_str(has_finalizer()),
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290 bool_to_str(has_subklass()),
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291 layout_helper());
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292
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293 _flags.print_klass_flags();
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294
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295 if (_super) {
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296 st->print(" super=");
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297 _super->print_name();
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298 }
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299 if (_java_mirror) {
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300 st->print(" mirror=PRESENT");
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301 }
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302 } else {
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303 st->print(" loaded=false");
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304 }
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305 }
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306
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307 // ------------------------------------------------------------------
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308 // ciInstanceKlass::super
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309 //
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310 // Get the superklass of this klass.
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311 ciInstanceKlass* ciInstanceKlass::super() {
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312 assert(is_loaded(), "must be loaded");
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313 if (_super == NULL && !is_java_lang_Object()) {
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314 GUARDED_VM_ENTRY(
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315 klassOop super_klass = get_instanceKlass()->super();
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316 _super = CURRENT_ENV->get_object(super_klass)->as_instance_klass();
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317 )
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318 }
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319 return _super;
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320 }
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321
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322 // ------------------------------------------------------------------
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323 // ciInstanceKlass::java_mirror
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324 //
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325 // Get the instance of java.lang.Class corresponding to this klass.
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326 ciInstance* ciInstanceKlass::java_mirror() {
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327 if (_java_mirror == NULL) {
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328 if (!is_loaded())
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329 _java_mirror = ciEnv::current()->get_unloaded_klass_mirror(this);
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330 else
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331 _java_mirror = ciKlass::java_mirror();
0
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332 }
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333 return _java_mirror;
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334 }
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335
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336 // ------------------------------------------------------------------
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337 // ciInstanceKlass::unique_concrete_subklass
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338 ciInstanceKlass* ciInstanceKlass::unique_concrete_subklass() {
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339 if (!is_loaded()) return NULL; // No change if class is not loaded
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340 if (!is_abstract()) return NULL; // Only applies to abstract classes.
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341 if (!has_subklass()) return NULL; // Must have at least one subklass.
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342 VM_ENTRY_MARK;
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343 instanceKlass* ik = get_instanceKlass();
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344 Klass* up = ik->up_cast_abstract();
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345 assert(up->oop_is_instance(), "must be instanceKlass");
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346 if (ik == up) {
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347 return NULL;
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348 }
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349 return CURRENT_THREAD_ENV->get_object(up->as_klassOop())->as_instance_klass();
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350 }
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351
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352 // ------------------------------------------------------------------
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353 // ciInstanceKlass::has_finalizable_subclass
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354 bool ciInstanceKlass::has_finalizable_subclass() {
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355 if (!is_loaded()) return true;
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356 VM_ENTRY_MARK;
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357 return Dependencies::find_finalizable_subclass(get_instanceKlass()) != NULL;
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358 }
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359
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360 // ------------------------------------------------------------------
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361 // ciInstanceKlass::get_field_by_offset
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362 ciField* ciInstanceKlass::get_field_by_offset(int field_offset, bool is_static) {
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363 if (!is_static) {
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364 for (int i = 0, len = nof_nonstatic_fields(); i < len; i++) {
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365 ciField* field = _nonstatic_fields->at(i);
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366 int field_off = field->offset_in_bytes();
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367 if (field_off == field_offset)
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368 return field;
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369 if (field_off > field_offset)
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370 break;
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371 // could do binary search or check bins, but probably not worth it
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372 }
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373 return NULL;
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374 }
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375 VM_ENTRY_MARK;
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376 instanceKlass* k = get_instanceKlass();
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377 fieldDescriptor fd;
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378 if (!k->find_field_from_offset(field_offset, is_static, &fd)) {
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379 return NULL;
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380 }
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381 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
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382 return field;
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383 }
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384
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385 // ------------------------------------------------------------------
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386 // ciInstanceKlass::get_field_by_name
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387 ciField* ciInstanceKlass::get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static) {
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388 VM_ENTRY_MARK;
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389 instanceKlass* k = get_instanceKlass();
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390 fieldDescriptor fd;
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391 klassOop def = k->find_field(name->get_symbolOop(), signature->get_symbolOop(), is_static, &fd);
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392 if (def == NULL) {
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393 return NULL;
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diff changeset
394 }
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395 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
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396 return field;
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397 }
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398
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399 // ------------------------------------------------------------------
44
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400 // ciInstanceKlass::non_static_fields.
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401
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402 class NonStaticFieldFiller: public FieldClosure {
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403 GrowableArray<ciField*>* _arr;
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404 ciEnv* _curEnv;
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405 public:
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406 NonStaticFieldFiller(ciEnv* curEnv, GrowableArray<ciField*>* arr) :
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407 _curEnv(curEnv), _arr(arr)
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408 {}
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409 void do_field(fieldDescriptor* fd) {
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410 ciField* field = new (_curEnv->arena()) ciField(fd);
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411 _arr->append(field);
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412 }
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413 };
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414
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415 GrowableArray<ciField*>* ciInstanceKlass::non_static_fields() {
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416 if (_non_static_fields == NULL) {
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417 VM_ENTRY_MARK;
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418 ciEnv* curEnv = ciEnv::current();
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419 instanceKlass* ik = get_instanceKlass();
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420 int max_n_fields = ik->fields()->length()/instanceKlass::next_offset;
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421
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422 _non_static_fields =
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diff changeset
423 new (curEnv->arena()) GrowableArray<ciField*>(max_n_fields);
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424 NonStaticFieldFiller filler(curEnv, _non_static_fields);
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425 ik->do_nonstatic_fields(&filler);
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426 }
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diff changeset
427 return _non_static_fields;
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diff changeset
428 }
52fed2ec0afb 6667620: (Escape Analysis) fix deoptimization for scalar replaced objects
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diff changeset
429
0
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diff changeset
430 static int sort_field_by_offset(ciField** a, ciField** b) {
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431 return (*a)->offset_in_bytes() - (*b)->offset_in_bytes();
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432 // (no worries about 32-bit overflow...)
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433 }
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434
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435 // ------------------------------------------------------------------
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diff changeset
436 // ciInstanceKlass::compute_nonstatic_fields
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437 int ciInstanceKlass::compute_nonstatic_fields() {
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438 assert(is_loaded(), "must be loaded");
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439
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440 if (_nonstatic_fields != NULL)
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441 return _nonstatic_fields->length();
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442
113
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443 if (!has_nonstatic_fields()) {
0
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444 Arena* arena = CURRENT_ENV->arena();
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445 _nonstatic_fields = new (arena) GrowableArray<ciField*>(arena, 0, 0, NULL);
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446 return 0;
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447 }
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448 assert(!is_java_lang_Object(), "bootstrap OK");
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449
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450 // Size in bytes of my fields, including inherited fields.
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451 int fsize = nonstatic_field_size() * heapOopSize;
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452
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453 ciInstanceKlass* super = this->super();
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454 GrowableArray<ciField*>* super_fields = NULL;
113
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455 if (super != NULL && super->has_nonstatic_fields()) {
165
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456 int super_fsize = super->nonstatic_field_size() * heapOopSize;
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diff changeset
457 int super_flen = super->nof_nonstatic_fields();
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458 super_fields = super->_nonstatic_fields;
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459 assert(super_flen == 0 || super_fields != NULL, "first get nof_fields");
113
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diff changeset
460 // See if I am no larger than my super; if so, I can use his fields.
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diff changeset
461 if (fsize == super_fsize) {
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462 _nonstatic_fields = super_fields;
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diff changeset
463 return super_fields->length();
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464 }
0
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465 }
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466
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467 GrowableArray<ciField*>* fields = NULL;
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diff changeset
468 GUARDED_VM_ENTRY({
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469 fields = compute_nonstatic_fields_impl(super_fields);
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470 });
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diff changeset
471
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472 if (fields == NULL) {
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parents:
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473 // This can happen if this class (java.lang.Class) has invisible fields.
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474 _nonstatic_fields = super_fields;
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475 return super_fields->length();
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476 }
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477
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parents:
diff changeset
478 int flen = fields->length();
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479
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480 // Now sort them by offset, ascending.
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481 // (In principle, they could mix with superclass fields.)
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482 fields->sort(sort_field_by_offset);
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483 #ifdef ASSERT
113
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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diff changeset
484 int last_offset = instanceOopDesc::base_offset_in_bytes();
0
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485 for (int i = 0; i < fields->length(); i++) {
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486 ciField* field = fields->at(i);
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diff changeset
487 int offset = field->offset_in_bytes();
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diff changeset
488 int size = (field->_type == NULL) ? heapOopSize : field->size_in_bytes();
0
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diff changeset
489 assert(last_offset <= offset, "no field overlap");
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490 if (last_offset > (int)sizeof(oopDesc))
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diff changeset
491 assert((offset - last_offset) < BytesPerLong, "no big holes");
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492 // Note: Two consecutive T_BYTE fields will be separated by wordSize-1
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493 // padding bytes if one of them is declared by a superclass.
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494 // This is a minor inefficiency classFileParser.cpp.
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495 last_offset = offset + size;
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496 }
165
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497 assert(last_offset <= (int)instanceOopDesc::base_offset_in_bytes() + fsize, "no overflow");
0
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498 #endif
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499
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500 _nonstatic_fields = fields;
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501 return flen;
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502 }
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503
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504 GrowableArray<ciField*>*
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diff changeset
505 ciInstanceKlass::compute_nonstatic_fields_impl(GrowableArray<ciField*>*
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506 super_fields) {
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507 ASSERT_IN_VM;
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diff changeset
508 Arena* arena = CURRENT_ENV->arena();
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509 int flen = 0;
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510 GrowableArray<ciField*>* fields = NULL;
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diff changeset
511 instanceKlass* k = get_instanceKlass();
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diff changeset
512 typeArrayOop fields_array = k->fields();
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513 for (int pass = 0; pass <= 1; pass++) {
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514 for (int i = 0, alen = fields_array->length(); i < alen; i += instanceKlass::next_offset) {
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diff changeset
515 fieldDescriptor fd;
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diff changeset
516 fd.initialize(k->as_klassOop(), i);
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517 if (fd.is_static()) continue;
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518 if (pass == 0) {
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diff changeset
519 flen += 1;
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520 } else {
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521 ciField* field = new (arena) ciField(&fd);
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522 fields->append(field);
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523 }
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diff changeset
524 }
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diff changeset
525
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parents:
diff changeset
526 // Between passes, allocate the array:
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diff changeset
527 if (pass == 0) {
a61af66fc99e Initial load
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528 if (flen == 0) {
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diff changeset
529 return NULL; // return nothing if none are locally declared
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diff changeset
530 }
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parents:
diff changeset
531 if (super_fields != NULL) {
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diff changeset
532 flen += super_fields->length();
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parents:
diff changeset
533 }
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diff changeset
534 fields = new (arena) GrowableArray<ciField*>(arena, flen, 0, NULL);
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diff changeset
535 if (super_fields != NULL) {
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diff changeset
536 fields->appendAll(super_fields);
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diff changeset
537 }
a61af66fc99e Initial load
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parents:
diff changeset
538 }
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parents:
diff changeset
539 }
a61af66fc99e Initial load
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parents:
diff changeset
540 assert(fields->length() == flen, "sanity");
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parents:
diff changeset
541 return fields;
a61af66fc99e Initial load
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parents:
diff changeset
542 }
a61af66fc99e Initial load
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diff changeset
543
a61af66fc99e Initial load
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diff changeset
544 // ------------------------------------------------------------------
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parents:
diff changeset
545 // ciInstanceKlass::find_method
a61af66fc99e Initial load
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diff changeset
546 //
a61af66fc99e Initial load
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parents:
diff changeset
547 // Find a method in this klass.
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parents:
diff changeset
548 ciMethod* ciInstanceKlass::find_method(ciSymbol* name, ciSymbol* signature) {
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diff changeset
549 VM_ENTRY_MARK;
a61af66fc99e Initial load
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parents:
diff changeset
550 instanceKlass* k = get_instanceKlass();
a61af66fc99e Initial load
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parents:
diff changeset
551 symbolOop name_sym = name->get_symbolOop();
a61af66fc99e Initial load
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parents:
diff changeset
552 symbolOop sig_sym= signature->get_symbolOop();
a61af66fc99e Initial load
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diff changeset
553
a61af66fc99e Initial load
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parents:
diff changeset
554 methodOop m = k->find_method(name_sym, sig_sym);
a61af66fc99e Initial load
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parents:
diff changeset
555 if (m == NULL) return NULL;
a61af66fc99e Initial load
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parents:
diff changeset
556
a61af66fc99e Initial load
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parents:
diff changeset
557 return CURRENT_THREAD_ENV->get_object(m)->as_method();
a61af66fc99e Initial load
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parents:
diff changeset
558 }
a61af66fc99e Initial load
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parents:
diff changeset
559
a61af66fc99e Initial load
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parents:
diff changeset
560 // ------------------------------------------------------------------
a61af66fc99e Initial load
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parents:
diff changeset
561 // ciInstanceKlass::is_leaf_type
a61af66fc99e Initial load
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parents:
diff changeset
562 bool ciInstanceKlass::is_leaf_type() {
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parents:
diff changeset
563 assert(is_loaded(), "must be loaded");
a61af66fc99e Initial load
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parents:
diff changeset
564 if (is_shared()) {
a61af66fc99e Initial load
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parents:
diff changeset
565 return is_final(); // approximately correct
a61af66fc99e Initial load
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parents:
diff changeset
566 } else {
a61af66fc99e Initial load
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parents:
diff changeset
567 return !_has_subklass && (_nof_implementors == 0);
a61af66fc99e Initial load
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parents:
diff changeset
568 }
a61af66fc99e Initial load
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parents:
diff changeset
569 }
a61af66fc99e Initial load
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parents:
diff changeset
570
a61af66fc99e Initial load
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parents:
diff changeset
571 // ------------------------------------------------------------------
a61af66fc99e Initial load
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parents:
diff changeset
572 // ciInstanceKlass::implementor
a61af66fc99e Initial load
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parents:
diff changeset
573 //
a61af66fc99e Initial load
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parents:
diff changeset
574 // Report an implementor of this interface.
a61af66fc99e Initial load
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parents:
diff changeset
575 // Returns NULL if exact information is not available.
a61af66fc99e Initial load
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parents:
diff changeset
576 // Note that there are various races here, since my copy
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parents:
diff changeset
577 // of _nof_implementors might be out of date with respect
a61af66fc99e Initial load
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parents:
diff changeset
578 // to results returned by instanceKlass::implementor.
a61af66fc99e Initial load
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parents:
diff changeset
579 // This is OK, since any dependencies we decide to assert
a61af66fc99e Initial load
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parents:
diff changeset
580 // will be checked later under the Compile_lock.
a61af66fc99e Initial load
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parents:
diff changeset
581 ciInstanceKlass* ciInstanceKlass::implementor(int n) {
a61af66fc99e Initial load
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parents:
diff changeset
582 if (n > implementors_limit) {
a61af66fc99e Initial load
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parents:
diff changeset
583 return NULL;
a61af66fc99e Initial load
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parents:
diff changeset
584 }
a61af66fc99e Initial load
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parents:
diff changeset
585 ciInstanceKlass* impl = _implementors[n];
a61af66fc99e Initial load
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parents:
diff changeset
586 if (impl == NULL) {
a61af66fc99e Initial load
duke
parents:
diff changeset
587 if (_nof_implementors > implementors_limit) {
a61af66fc99e Initial load
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parents:
diff changeset
588 return NULL;
a61af66fc99e Initial load
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parents:
diff changeset
589 }
a61af66fc99e Initial load
duke
parents:
diff changeset
590 // Go into the VM to fetch the implementor.
a61af66fc99e Initial load
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parents:
diff changeset
591 {
a61af66fc99e Initial load
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parents:
diff changeset
592 VM_ENTRY_MARK;
a61af66fc99e Initial load
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parents:
diff changeset
593 klassOop k = get_instanceKlass()->implementor(n);
a61af66fc99e Initial load
duke
parents:
diff changeset
594 if (k != NULL) {
a61af66fc99e Initial load
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parents:
diff changeset
595 impl = CURRENT_THREAD_ENV->get_object(k)->as_instance_klass();
a61af66fc99e Initial load
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parents:
diff changeset
596 }
a61af66fc99e Initial load
duke
parents:
diff changeset
597 }
a61af66fc99e Initial load
duke
parents:
diff changeset
598 // Memoize this result.
a61af66fc99e Initial load
duke
parents:
diff changeset
599 if (!is_shared()) {
a61af66fc99e Initial load
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parents:
diff changeset
600 _implementors[n] = (impl == NULL)? this: impl;
a61af66fc99e Initial load
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parents:
diff changeset
601 }
a61af66fc99e Initial load
duke
parents:
diff changeset
602 } else if (impl == this) {
a61af66fc99e Initial load
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parents:
diff changeset
603 impl = NULL; // memoized null result from a VM query
a61af66fc99e Initial load
duke
parents:
diff changeset
604 }
a61af66fc99e Initial load
duke
parents:
diff changeset
605 return impl;
a61af66fc99e Initial load
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parents:
diff changeset
606 }