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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/_ciObject.cpp.incl"
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27
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28 // ciObject
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29 //
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30 // This class represents an oop in the HotSpot virtual machine.
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31 // Its subclasses are structured in a hierarchy which mirrors
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32 // an aggregate of the VM's oop and klass hierarchies (see
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33 // oopHierarchy.hpp). Each instance of ciObject holds a handle
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34 // to a corresponding oop on the VM side and provides routines
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35 // for accessing the information in its oop. By using the ciObject
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36 // hierarchy for accessing oops in the VM, the compiler ensures
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37 // that it is safe with respect to garbage collection; that is,
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38 // GC and compilation can proceed independently without
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39 // interference.
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40 //
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41 // Within the VM, the oop and klass hierarchies are separate.
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42 // The compiler interface does not preserve this separation --
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43 // the distinction between `klassOop' and `Klass' are not
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44 // reflected in the interface and instead the Klass hierarchy
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45 // is directly modeled as the subclasses of ciKlass.
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46
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47 // ------------------------------------------------------------------
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48 // ciObject::ciObject
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49 ciObject::ciObject(oop o) {
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50 ASSERT_IN_VM;
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51 if (ciObjectFactory::is_initialized()) {
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52 _handle = JNIHandles::make_local(o);
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53 } else {
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54 _handle = JNIHandles::make_global(o);
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55 }
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56 _klass = NULL;
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57 _ident = 0;
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58 }
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59
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60 // ------------------------------------------------------------------
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61 // ciObject::ciObject
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62 //
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63 ciObject::ciObject(Handle h) {
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64 ASSERT_IN_VM;
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65 if (ciObjectFactory::is_initialized()) {
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66 _handle = JNIHandles::make_local(h());
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67 } else {
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68 _handle = JNIHandles::make_global(h);
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69 }
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70 _klass = NULL;
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71 _ident = 0;
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72 }
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73
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74 // ------------------------------------------------------------------
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75 // ciObject::ciObject
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76 //
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77 // Unloaded klass/method variant. `klass' is the klass of the unloaded
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78 // klass/method, if that makes sense.
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79 ciObject::ciObject(ciKlass* klass) {
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80 ASSERT_IN_VM;
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81 assert(klass != NULL, "must supply klass");
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82 _handle = NULL;
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83 _klass = klass;
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84 _ident = 0;
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85 }
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86
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87 // ------------------------------------------------------------------
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88 // ciObject::ciObject
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89 //
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90 // NULL variant. Used only by ciNullObject.
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91 ciObject::ciObject() {
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92 ASSERT_IN_VM;
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93 _handle = NULL;
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94 _klass = NULL;
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95 _ident = 0;
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96 }
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97
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98 // ------------------------------------------------------------------
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99 // ciObject::klass
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100 //
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101 // Get the ciKlass of this ciObject.
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102 ciKlass* ciObject::klass() {
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103 if (_klass == NULL) {
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104 if (_handle == NULL) {
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105 // When both _klass and _handle are NULL, we are dealing
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106 // with the distinguished instance of ciNullObject.
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107 // No one should ask it for its klass.
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108 assert(is_null_object(), "must be null object");
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109 ShouldNotReachHere();
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110 return NULL;
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111 }
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112
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113 GUARDED_VM_ENTRY(
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114 oop o = get_oop();
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115 _klass = CURRENT_ENV->get_object(o->klass())->as_klass();
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116 );
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117 }
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118 return _klass;
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119 }
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120
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121 // ------------------------------------------------------------------
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122 // ciObject::set_ident
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123 //
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124 // Set the unique identity number of a ciObject.
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125 void ciObject::set_ident(uint id) {
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126 assert((_ident >> FLAG_BITS) == 0, "must only initialize once");
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127 assert( id < ((uint)1 << (BitsPerInt-FLAG_BITS)), "id too big");
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128 _ident = _ident + (id << FLAG_BITS);
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129 }
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130
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131 // ------------------------------------------------------------------
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132 // ciObject::ident
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133 //
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134 // Report the unique identity number of a ciObject.
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135 uint ciObject::ident() {
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136 uint id = _ident >> FLAG_BITS;
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137 assert(id != 0, "must be initialized");
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138 return id;
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139 }
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140
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141 // ------------------------------------------------------------------
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142 // ciObject::equals
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143 //
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144 // Are two ciObjects equal?
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145 bool ciObject::equals(ciObject* obj) {
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146 return (this == obj);
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147 }
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148
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149 // ------------------------------------------------------------------
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150 // ciObject::hash
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151 //
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152 // A hash value for the convenience of compilers.
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153 //
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154 // Implementation note: we use the address of the ciObject as the
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155 // basis for the hash. Use the _ident field, which is well-behaved.
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156 int ciObject::hash() {
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157 return ident() * 31;
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158 }
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159
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160 // ------------------------------------------------------------------
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161 // ciObject::encoding
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162 //
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163 // The address which the compiler should embed into the
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164 // generated code to represent this oop. This address
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165 // is not the true address of the oop -- it will get patched
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166 // during nmethod creation.
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167 //
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168 //
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169 //
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170 // Implementation note: we use the handle as the encoding. The
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171 // nmethod constructor resolves the handle and patches in the oop.
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172 //
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173 // This method should be changed to return an generified address
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174 // to discourage use of the JNI handle.
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175 jobject ciObject::encoding() {
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176 assert(is_null_object() || handle() != NULL, "cannot embed null pointer");
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177 assert(has_encoding(), "oop must be NULL or perm");
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178 return handle();
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179 }
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180
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181 // ------------------------------------------------------------------
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182 // ciObject::has_encoding
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183 bool ciObject::has_encoding() {
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184 return handle() == NULL || is_perm();
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185 }
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186
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187
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188 // ------------------------------------------------------------------
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189 // ciObject::print
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190 //
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191 // Print debugging output about this ciObject.
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192 //
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193 // Implementation note: dispatch to the virtual print_impl behavior
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194 // for this ciObject.
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195 void ciObject::print(outputStream* st) {
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196 st->print("<%s", type_string());
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197 GUARDED_VM_ENTRY(print_impl(st);)
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198 st->print(" ident=%d %s address=0x%x>", ident(),
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199 is_perm() ? "PERM" : "",
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200 (address)this);
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201 }
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202
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203 // ------------------------------------------------------------------
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204 // ciObject::print_oop
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205 //
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206 // Print debugging output about the oop this ciObject represents.
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207 void ciObject::print_oop(outputStream* st) {
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208 if (is_null_object()) {
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209 st->print_cr("NULL");
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210 } else if (!is_loaded()) {
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211 st->print_cr("UNLOADED");
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212 } else {
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213 GUARDED_VM_ENTRY(get_oop()->print_on(st);)
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214 }
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215 }
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