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0
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1 /*
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2 * Copyright 1999-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any 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) : ciKlass(h_k) {
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38 assert(get_Klass()->oop_is_instance(), "wrong type");
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39 instanceKlass* ik = get_instanceKlass();
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40
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41 AccessFlags access_flags = ik->access_flags();
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42 _flags = ciFlags(access_flags);
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43 _has_finalizer = access_flags.has_finalizer();
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44 _has_subklass = ik->subklass() != NULL;
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45 _is_initialized = ik->is_initialized();
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46 // Next line must follow and use the result of the previous line:
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47 _is_linked = _is_initialized || ik->is_linked();
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48 _nonstatic_field_size = ik->nonstatic_field_size();
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49 _nonstatic_fields = NULL; // initialized lazily by compute_nonstatic_fields:
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50
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51 _nof_implementors = ik->nof_implementors();
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52 for (int i = 0; i < implementors_limit; i++) {
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53 _implementors[i] = NULL; // we will fill these lazily
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54 }
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55
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56 Thread *thread = Thread::current();
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57 if (ciObjectFactory::is_initialized()) {
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58 _loader = JNIHandles::make_local(thread, ik->class_loader());
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59 _protection_domain = JNIHandles::make_local(thread,
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60 ik->protection_domain());
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61 _is_shared = false;
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62 } else {
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63 Handle h_loader(thread, ik->class_loader());
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64 Handle h_protection_domain(thread, ik->protection_domain());
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65 _loader = JNIHandles::make_global(h_loader);
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66 _protection_domain = JNIHandles::make_global(h_protection_domain);
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67 _is_shared = true;
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68 }
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69
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70 // Lazy fields get filled in only upon request.
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71 _super = NULL;
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72 _java_mirror = NULL;
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73
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74 if (is_shared()) {
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75 if (h_k() != SystemDictionary::object_klass()) {
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76 super();
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77 }
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78 java_mirror();
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79 //compute_nonstatic_fields(); // done outside of constructor
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80 }
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81
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82 _field_cache = NULL;
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83 }
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84
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85 // Version for unloaded classes:
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86 ciInstanceKlass::ciInstanceKlass(ciSymbol* name,
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87 jobject loader, jobject protection_domain)
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88 : ciKlass(name, ciInstanceKlassKlass::make())
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89 {
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90 assert(name->byte_at(0) != '[', "not an instance klass");
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91 _is_initialized = false;
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92 _is_linked = false;
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93 _nonstatic_field_size = -1;
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94 _nonstatic_fields = NULL;
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95 _nof_implementors = -1;
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96 _loader = loader;
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97 _protection_domain = protection_domain;
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98 _is_shared = false;
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99 _super = NULL;
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100 _java_mirror = NULL;
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101 _field_cache = NULL;
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102 }
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103
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104
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105
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106 // ------------------------------------------------------------------
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107 // ciInstanceKlass::compute_shared_is_initialized
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108 bool ciInstanceKlass::compute_shared_is_initialized() {
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109 GUARDED_VM_ENTRY(
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110 instanceKlass* ik = get_instanceKlass();
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111 _is_initialized = ik->is_initialized();
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112 return _is_initialized;
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113 )
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114 }
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115
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116 // ------------------------------------------------------------------
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117 // ciInstanceKlass::compute_shared_is_linked
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118 bool ciInstanceKlass::compute_shared_is_linked() {
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119 GUARDED_VM_ENTRY(
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120 instanceKlass* ik = get_instanceKlass();
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121 _is_linked = ik->is_linked();
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122 return _is_linked;
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123 )
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124 }
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125
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126 // ------------------------------------------------------------------
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127 // ciInstanceKlass::compute_shared_has_subklass
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128 bool ciInstanceKlass::compute_shared_has_subklass() {
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129 GUARDED_VM_ENTRY(
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130 instanceKlass* ik = get_instanceKlass();
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131 _has_subklass = ik->subklass() != NULL;
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132 return _has_subklass;
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133 )
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134 }
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135
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136 // ------------------------------------------------------------------
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137 // ciInstanceKlass::compute_shared_nof_implementors
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138 int ciInstanceKlass::compute_shared_nof_implementors() {
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139 // We requery this property, since it is a very old ciObject.
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140 GUARDED_VM_ENTRY(
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141 instanceKlass* ik = get_instanceKlass();
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142 _nof_implementors = ik->nof_implementors();
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143 return _nof_implementors;
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144 )
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145 }
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146
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147 // ------------------------------------------------------------------
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148 // ciInstanceKlass::loader
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149 oop ciInstanceKlass::loader() {
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150 ASSERT_IN_VM;
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151 return JNIHandles::resolve(_loader);
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152 }
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153
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154 // ------------------------------------------------------------------
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155 // ciInstanceKlass::loader_handle
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156 jobject ciInstanceKlass::loader_handle() {
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157 return _loader;
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158 }
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159
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160 // ------------------------------------------------------------------
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161 // ciInstanceKlass::protection_domain
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162 oop ciInstanceKlass::protection_domain() {
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163 ASSERT_IN_VM;
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164 return JNIHandles::resolve(_protection_domain);
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165 }
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166
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167 // ------------------------------------------------------------------
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168 // ciInstanceKlass::protection_domain_handle
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169 jobject ciInstanceKlass::protection_domain_handle() {
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170 return _protection_domain;
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171 }
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172
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173 // ------------------------------------------------------------------
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174 // ciInstanceKlass::field_cache
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175 //
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176 // Get the field cache associated with this klass.
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177 ciConstantPoolCache* ciInstanceKlass::field_cache() {
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178 if (is_shared()) {
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179 return NULL;
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180 }
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181 if (_field_cache == NULL) {
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182 assert(!is_java_lang_Object(), "Object has no fields");
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183 Arena* arena = CURRENT_ENV->arena();
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184 _field_cache = new (arena) ciConstantPoolCache(arena, 5);
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185 }
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186 return _field_cache;
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187 }
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188
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189 // ------------------------------------------------------------------
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190 // ciInstanceKlass::get_canonical_holder
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191 //
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192 ciInstanceKlass* ciInstanceKlass::get_canonical_holder(int offset) {
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193 #ifdef ASSERT
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194 if (!(offset >= 0 && offset < layout_helper())) {
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195 tty->print("*** get_canonical_holder(%d) on ", offset);
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196 this->print();
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197 tty->print_cr(" ***");
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198 };
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199 assert(offset >= 0 && offset < layout_helper(), "offset must be tame");
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200 #endif
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201
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202 if (offset < (instanceOopDesc::header_size() * wordSize)) {
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203 // All header offsets belong properly to java/lang/Object.
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204 return CURRENT_ENV->Object_klass();
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205 }
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206
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207 ciInstanceKlass* self = this;
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208 for (;;) {
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209 assert(self->is_loaded(), "must be loaded to have size");
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210 ciInstanceKlass* super = self->super();
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211 if (super == NULL || !super->contains_field_offset(offset)) {
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212 return self;
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213 } else {
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214 self = super; // return super->get_canonical_holder(offset)
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215 }
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216 }
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217 }
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218
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219 // ------------------------------------------------------------------
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220 // ciInstanceKlass::is_java_lang_Object
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221 //
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222 // Is this klass java.lang.Object?
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223 bool ciInstanceKlass::is_java_lang_Object() {
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224 return equals(CURRENT_ENV->Object_klass());
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225 }
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226
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227 // ------------------------------------------------------------------
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228 // ciInstanceKlass::uses_default_loader
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229 bool ciInstanceKlass::uses_default_loader() {
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230 VM_ENTRY_MARK;
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231 return loader() == NULL;
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232 }
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233
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234 // ------------------------------------------------------------------
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235 // ciInstanceKlass::print_impl
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236 //
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237 // Implementation of the print method.
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238 void ciInstanceKlass::print_impl(outputStream* st) {
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239 ciKlass::print_impl(st);
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240 GUARDED_VM_ENTRY(st->print(" loader=0x%x", (address)loader());)
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241 if (is_loaded()) {
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242 st->print(" loaded=true initialized=%s finalized=%s subklass=%s size=%d flags=",
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243 bool_to_str(is_initialized()),
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244 bool_to_str(has_finalizer()),
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245 bool_to_str(has_subklass()),
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246 layout_helper());
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247
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248 _flags.print_klass_flags();
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249
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250 if (_super) {
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251 st->print(" super=");
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252 _super->print_name();
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253 }
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254 if (_java_mirror) {
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255 st->print(" mirror=PRESENT");
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256 }
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257 } else {
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258 st->print(" loaded=false");
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259 }
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260 }
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261
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262 // ------------------------------------------------------------------
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263 // ciInstanceKlass::super
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264 //
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265 // Get the superklass of this klass.
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266 ciInstanceKlass* ciInstanceKlass::super() {
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267 assert(is_loaded(), "must be loaded");
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268 if (_super == NULL && !is_java_lang_Object()) {
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269 GUARDED_VM_ENTRY(
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270 klassOop super_klass = get_instanceKlass()->super();
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271 _super = CURRENT_ENV->get_object(super_klass)->as_instance_klass();
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272 )
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273 }
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274 return _super;
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275 }
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276
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277 // ------------------------------------------------------------------
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278 // ciInstanceKlass::java_mirror
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279 //
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280 // Get the instance of java.lang.Class corresponding to this klass.
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281 ciInstance* ciInstanceKlass::java_mirror() {
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282 assert(is_loaded(), "must be loaded");
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283 if (_java_mirror == NULL) {
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284 _java_mirror = ciKlass::java_mirror();
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285 }
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286 return _java_mirror;
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287 }
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288
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289 // ------------------------------------------------------------------
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290 // ciInstanceKlass::unique_concrete_subklass
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291 ciInstanceKlass* ciInstanceKlass::unique_concrete_subklass() {
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292 if (!is_loaded()) return NULL; // No change if class is not loaded
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293 if (!is_abstract()) return NULL; // Only applies to abstract classes.
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294 if (!has_subklass()) return NULL; // Must have at least one subklass.
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295 VM_ENTRY_MARK;
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296 instanceKlass* ik = get_instanceKlass();
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297 Klass* up = ik->up_cast_abstract();
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298 assert(up->oop_is_instance(), "must be instanceKlass");
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299 if (ik == up) {
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300 return NULL;
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301 }
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302 return CURRENT_THREAD_ENV->get_object(up->as_klassOop())->as_instance_klass();
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303 }
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304
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305 // ------------------------------------------------------------------
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306 // ciInstanceKlass::has_finalizable_subclass
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307 bool ciInstanceKlass::has_finalizable_subclass() {
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308 if (!is_loaded()) return true;
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309 VM_ENTRY_MARK;
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310 return Dependencies::find_finalizable_subclass(get_instanceKlass()) != NULL;
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311 }
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312
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313 // ------------------------------------------------------------------
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314 // ciInstanceKlass::get_field_by_offset
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315 ciField* ciInstanceKlass::get_field_by_offset(int field_offset, bool is_static) {
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316 if (!is_static) {
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317 for (int i = 0, len = nof_nonstatic_fields(); i < len; i++) {
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318 ciField* field = _nonstatic_fields->at(i);
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319 int field_off = field->offset_in_bytes();
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320 if (field_off == field_offset)
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321 return field;
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322 if (field_off > field_offset)
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323 break;
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324 // could do binary search or check bins, but probably not worth it
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325 }
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326 return NULL;
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327 }
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328 VM_ENTRY_MARK;
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329 instanceKlass* k = get_instanceKlass();
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330 fieldDescriptor fd;
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331 if (!k->find_field_from_offset(field_offset, is_static, &fd)) {
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332 return NULL;
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333 }
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334 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
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335 return field;
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336 }
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337
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338 static int sort_field_by_offset(ciField** a, ciField** b) {
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339 return (*a)->offset_in_bytes() - (*b)->offset_in_bytes();
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340 // (no worries about 32-bit overflow...)
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341 }
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342
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343 // ------------------------------------------------------------------
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344 // ciInstanceKlass::compute_nonstatic_fields
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345 int ciInstanceKlass::compute_nonstatic_fields() {
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346 assert(is_loaded(), "must be loaded");
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347
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348 if (_nonstatic_fields != NULL)
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349 return _nonstatic_fields->length();
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350
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351 // Size in bytes of my fields, including inherited fields.
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352 // About equal to size_helper() - sizeof(oopDesc).
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353 int fsize = nonstatic_field_size() * wordSize;
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354 if (fsize == 0) { // easy shortcut
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355 Arena* arena = CURRENT_ENV->arena();
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356 _nonstatic_fields = new (arena) GrowableArray<ciField*>(arena, 0, 0, NULL);
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357 return 0;
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358 }
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359 assert(!is_java_lang_Object(), "bootstrap OK");
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360
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361 ciInstanceKlass* super = this->super();
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362 int super_fsize = 0;
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363 int super_flen = 0;
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364 GrowableArray<ciField*>* super_fields = NULL;
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365 if (super != NULL) {
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366 super_fsize = super->nonstatic_field_size() * wordSize;
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367 super_flen = super->nof_nonstatic_fields();
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368 super_fields = super->_nonstatic_fields;
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369 assert(super_flen == 0 || super_fields != NULL, "first get nof_fields");
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370 }
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371
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372 // See if I am no larger than my super; if so, I can use his fields.
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373 if (fsize == super_fsize) {
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374 _nonstatic_fields = super_fields;
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375 return super_fields->length();
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376 }
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377
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378 GrowableArray<ciField*>* fields = NULL;
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379 GUARDED_VM_ENTRY({
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380 fields = compute_nonstatic_fields_impl(super_fields);
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381 });
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382
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383 if (fields == NULL) {
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384 // This can happen if this class (java.lang.Class) has invisible fields.
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385 _nonstatic_fields = super_fields;
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386 return super_fields->length();
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387 }
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388
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389 int flen = fields->length();
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390
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391 // Now sort them by offset, ascending.
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392 // (In principle, they could mix with superclass fields.)
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393 fields->sort(sort_field_by_offset);
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394 #ifdef ASSERT
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395 int last_offset = sizeof(oopDesc);
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396 for (int i = 0; i < fields->length(); i++) {
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397 ciField* field = fields->at(i);
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398 int offset = field->offset_in_bytes();
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399 int size = (field->_type == NULL) ? oopSize : field->size_in_bytes();
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400 assert(last_offset <= offset, "no field overlap");
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401 if (last_offset > (int)sizeof(oopDesc))
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402 assert((offset - last_offset) < BytesPerLong, "no big holes");
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403 // Note: Two consecutive T_BYTE fields will be separated by wordSize-1
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404 // padding bytes if one of them is declared by a superclass.
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405 // This is a minor inefficiency classFileParser.cpp.
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406 last_offset = offset + size;
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407 }
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408 assert(last_offset <= (int)sizeof(oopDesc) + fsize, "no overflow");
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409 #endif
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410
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411 _nonstatic_fields = fields;
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412 return flen;
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413 }
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414
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415 GrowableArray<ciField*>*
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416 ciInstanceKlass::compute_nonstatic_fields_impl(GrowableArray<ciField*>*
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417 super_fields) {
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418 ASSERT_IN_VM;
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419 Arena* arena = CURRENT_ENV->arena();
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420 int flen = 0;
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421 GrowableArray<ciField*>* fields = NULL;
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422 instanceKlass* k = get_instanceKlass();
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423 typeArrayOop fields_array = k->fields();
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424 for (int pass = 0; pass <= 1; pass++) {
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425 for (int i = 0, alen = fields_array->length(); i < alen; i += instanceKlass::next_offset) {
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426 fieldDescriptor fd;
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427 fd.initialize(k->as_klassOop(), i);
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428 if (fd.is_static()) continue;
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429 if (pass == 0) {
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430 flen += 1;
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|
|
431 } else {
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432 ciField* field = new (arena) ciField(&fd);
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433 fields->append(field);
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434 }
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435 }
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436
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437 // Between passes, allocate the array:
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|
438 if (pass == 0) {
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|
439 if (flen == 0) {
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|
440 return NULL; // return nothing if none are locally declared
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|
441 }
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|
|
442 if (super_fields != NULL) {
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443 flen += super_fields->length();
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|
|
444 }
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|
|
445 fields = new (arena) GrowableArray<ciField*>(arena, flen, 0, NULL);
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|
|
446 if (super_fields != NULL) {
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|
447 fields->appendAll(super_fields);
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|
|
448 }
|
|
|
449 }
|
|
|
450 }
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|
|
451 assert(fields->length() == flen, "sanity");
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|
|
452 return fields;
|
|
|
453 }
|
|
|
454
|
|
|
455 // ------------------------------------------------------------------
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|
|
456 // ciInstanceKlass::find_method
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|
|
457 //
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|
|
458 // Find a method in this klass.
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|
|
459 ciMethod* ciInstanceKlass::find_method(ciSymbol* name, ciSymbol* signature) {
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|
|
460 VM_ENTRY_MARK;
|
|
|
461 instanceKlass* k = get_instanceKlass();
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|
|
462 symbolOop name_sym = name->get_symbolOop();
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|
|
463 symbolOop sig_sym= signature->get_symbolOop();
|
|
|
464
|
|
|
465 methodOop m = k->find_method(name_sym, sig_sym);
|
|
|
466 if (m == NULL) return NULL;
|
|
|
467
|
|
|
468 return CURRENT_THREAD_ENV->get_object(m)->as_method();
|
|
|
469 }
|
|
|
470
|
|
|
471 // ------------------------------------------------------------------
|
|
|
472 // ciInstanceKlass::is_leaf_type
|
|
|
473 bool ciInstanceKlass::is_leaf_type() {
|
|
|
474 assert(is_loaded(), "must be loaded");
|
|
|
475 if (is_shared()) {
|
|
|
476 return is_final(); // approximately correct
|
|
|
477 } else {
|
|
|
478 return !_has_subklass && (_nof_implementors == 0);
|
|
|
479 }
|
|
|
480 }
|
|
|
481
|
|
|
482 // ------------------------------------------------------------------
|
|
|
483 // ciInstanceKlass::implementor
|
|
|
484 //
|
|
|
485 // Report an implementor of this interface.
|
|
|
486 // Returns NULL if exact information is not available.
|
|
|
487 // Note that there are various races here, since my copy
|
|
|
488 // of _nof_implementors might be out of date with respect
|
|
|
489 // to results returned by instanceKlass::implementor.
|
|
|
490 // This is OK, since any dependencies we decide to assert
|
|
|
491 // will be checked later under the Compile_lock.
|
|
|
492 ciInstanceKlass* ciInstanceKlass::implementor(int n) {
|
|
|
493 if (n > implementors_limit) {
|
|
|
494 return NULL;
|
|
|
495 }
|
|
|
496 ciInstanceKlass* impl = _implementors[n];
|
|
|
497 if (impl == NULL) {
|
|
|
498 if (_nof_implementors > implementors_limit) {
|
|
|
499 return NULL;
|
|
|
500 }
|
|
|
501 // Go into the VM to fetch the implementor.
|
|
|
502 {
|
|
|
503 VM_ENTRY_MARK;
|
|
|
504 klassOop k = get_instanceKlass()->implementor(n);
|
|
|
505 if (k != NULL) {
|
|
|
506 impl = CURRENT_THREAD_ENV->get_object(k)->as_instance_klass();
|
|
|
507 }
|
|
|
508 }
|
|
|
509 // Memoize this result.
|
|
|
510 if (!is_shared()) {
|
|
|
511 _implementors[n] = (impl == NULL)? this: impl;
|
|
|
512 }
|
|
|
513 } else if (impl == this) {
|
|
|
514 impl = NULL; // memoized null result from a VM query
|
|
|
515 }
|
|
|
516 return impl;
|
|
|
517 }
|
