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1 /* |
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2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 * |
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23 */ |
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24 |
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25 #ifndef SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP |
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26 #define SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP |
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27 |
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28 #include "classfile/classFileStream.hpp" |
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29 #include "classfile/classLoader.hpp" |
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30 #include "oops/objArrayOop.hpp" |
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31 #include "oops/symbol.hpp" |
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32 #include "runtime/java.hpp" |
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33 #include "runtime/reflectionUtils.hpp" |
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34 #include "utilities/hashtable.hpp" |
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35 #include "utilities/hashtable.inline.hpp" |
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36 |
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37 |
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38 // The system dictionary stores all loaded classes and maps: |
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39 // |
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40 // [class name,class loader] -> class i.e. [Symbol*,oop] -> Klass* |
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41 // |
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42 // Classes are loaded lazily. The default VM class loader is |
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43 // represented as NULL. |
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44 |
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45 // The underlying data structure is an open hash table with a fixed number |
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46 // of buckets. During loading the loader object is locked, (for the VM loader |
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47 // a private lock object is used). Class loading can thus be done concurrently, |
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48 // but only by different loaders. |
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49 // |
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50 // During loading a placeholder (name, loader) is temporarily placed in |
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51 // a side data structure, and is used to detect ClassCircularityErrors |
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52 // and to perform verification during GC. A GC can occur in the midst |
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53 // of class loading, as we call out to Java, have to take locks, etc. |
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54 // |
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55 // When class loading is finished, a new entry is added to the system |
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56 // dictionary and the place holder is removed. Note that the protection |
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57 // domain field of the system dictionary has not yet been filled in when |
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58 // the "real" system dictionary entry is created. |
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59 // |
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60 // Clients of this class who are interested in finding if a class has |
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61 // been completely loaded -- not classes in the process of being loaded -- |
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62 // can read the SystemDictionary unlocked. This is safe because |
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63 // - entries are only deleted at safepoints |
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64 // - readers cannot come to a safepoint while actively examining |
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65 // an entry (an entry cannot be deleted from under a reader) |
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66 // - entries must be fully formed before they are available to concurrent |
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67 // readers (we must ensure write ordering) |
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68 // |
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69 // Note that placeholders are deleted at any time, as they are removed |
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70 // when a class is completely loaded. Therefore, readers as well as writers |
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71 // of placeholders must hold the SystemDictionary_lock. |
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72 // |
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73 |
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74 class Dictionary; |
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75 class PlaceholderTable; |
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76 class LoaderConstraintTable; |
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77 template <MEMFLAGS F> class HashtableBucket; |
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78 class ResolutionErrorTable; |
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79 class SymbolPropertyTable; |
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80 class Ticks; |
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81 |
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82 // Certain classes are preloaded, such as java.lang.Object and java.lang.String. |
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83 // They are all "well-known", in the sense that no class loader is allowed |
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84 // to provide a different definition. |
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85 // |
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86 // These klasses must all have names defined in vmSymbols. |
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87 |
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88 #define WK_KLASS_ENUM_NAME(kname) kname##_knum |
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89 |
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90 // Each well-known class has a short klass name (like object_klass), |
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91 // a vmSymbol name (like java_lang_Object), and a flag word |
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92 // that makes some minor distinctions, like whether the klass |
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93 // is preloaded, optional, release-specific, etc. |
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94 // The order of these definitions is significant; it is the order in which |
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95 // preloading is actually performed by initialize_preloaded_classes. |
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96 |
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97 #define WK_KLASSES_DO(do_klass) \ |
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98 /* well-known classes */ \ |
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99 do_klass(Object_klass, java_lang_Object, Pre ) \ |
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100 do_klass(String_klass, java_lang_String, Pre ) \ |
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101 do_klass(Class_klass, java_lang_Class, Pre ) \ |
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102 do_klass(Cloneable_klass, java_lang_Cloneable, Pre ) \ |
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103 do_klass(ClassLoader_klass, java_lang_ClassLoader, Pre ) \ |
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104 do_klass(Serializable_klass, java_io_Serializable, Pre ) \ |
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105 do_klass(System_klass, java_lang_System, Pre ) \ |
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106 do_klass(Throwable_klass, java_lang_Throwable, Pre ) \ |
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107 do_klass(Error_klass, java_lang_Error, Pre ) \ |
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108 do_klass(ThreadDeath_klass, java_lang_ThreadDeath, Pre ) \ |
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109 do_klass(Exception_klass, java_lang_Exception, Pre ) \ |
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110 do_klass(RuntimeException_klass, java_lang_RuntimeException, Pre ) \ |
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111 do_klass(SecurityManager_klass, java_lang_SecurityManager, Pre ) \ |
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112 do_klass(ProtectionDomain_klass, java_security_ProtectionDomain, Pre ) \ |
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113 do_klass(AccessControlContext_klass, java_security_AccessControlContext, Pre ) \ |
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114 do_klass(ClassNotFoundException_klass, java_lang_ClassNotFoundException, Pre ) \ |
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115 do_klass(NoClassDefFoundError_klass, java_lang_NoClassDefFoundError, Pre ) \ |
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116 do_klass(LinkageError_klass, java_lang_LinkageError, Pre ) \ |
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117 do_klass(ClassCastException_klass, java_lang_ClassCastException, Pre ) \ |
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118 do_klass(ArrayStoreException_klass, java_lang_ArrayStoreException, Pre ) \ |
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119 do_klass(VirtualMachineError_klass, java_lang_VirtualMachineError, Pre ) \ |
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120 do_klass(OutOfMemoryError_klass, java_lang_OutOfMemoryError, Pre ) \ |
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121 do_klass(StackOverflowError_klass, java_lang_StackOverflowError, Pre ) \ |
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122 do_klass(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre ) \ |
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123 do_klass(Reference_klass, java_lang_ref_Reference, Pre ) \ |
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124 \ |
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125 /* Preload ref klasses and set reference types */ \ |
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126 do_klass(SoftReference_klass, java_lang_ref_SoftReference, Pre ) \ |
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127 do_klass(WeakReference_klass, java_lang_ref_WeakReference, Pre ) \ |
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128 do_klass(FinalReference_klass, java_lang_ref_FinalReference, Pre ) \ |
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129 do_klass(PhantomReference_klass, java_lang_ref_PhantomReference, Pre ) \ |
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130 do_klass(Finalizer_klass, java_lang_ref_Finalizer, Pre ) \ |
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131 \ |
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132 do_klass(Thread_klass, java_lang_Thread, Pre ) \ |
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133 do_klass(ThreadGroup_klass, java_lang_ThreadGroup, Pre ) \ |
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134 do_klass(Properties_klass, java_util_Properties, Pre ) \ |
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135 do_klass(reflect_AccessibleObject_klass, java_lang_reflect_AccessibleObject, Pre ) \ |
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136 do_klass(reflect_Field_klass, java_lang_reflect_Field, Pre ) \ |
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137 do_klass(reflect_Parameter_klass, java_lang_reflect_Parameter, Opt ) \ |
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138 do_klass(reflect_Method_klass, java_lang_reflect_Method, Pre ) \ |
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139 do_klass(reflect_Constructor_klass, java_lang_reflect_Constructor, Pre ) \ |
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140 \ |
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141 /* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \ |
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142 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \ |
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143 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \ |
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144 do_klass(reflect_MagicAccessorImpl_klass, sun_reflect_MagicAccessorImpl, Opt ) \ |
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145 do_klass(reflect_MethodAccessorImpl_klass, sun_reflect_MethodAccessorImpl, Opt_Only_JDK14NewRef) \ |
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146 do_klass(reflect_ConstructorAccessorImpl_klass, sun_reflect_ConstructorAccessorImpl, Opt_Only_JDK14NewRef) \ |
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147 do_klass(reflect_DelegatingClassLoader_klass, sun_reflect_DelegatingClassLoader, Opt ) \ |
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148 do_klass(reflect_ConstantPool_klass, sun_reflect_ConstantPool, Opt_Only_JDK15 ) \ |
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149 do_klass(reflect_UnsafeStaticFieldAccessorImpl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15 ) \ |
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150 do_klass(reflect_CallerSensitive_klass, sun_reflect_CallerSensitive, Opt ) \ |
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151 \ |
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152 /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \ |
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153 do_klass(DirectMethodHandle_klass, java_lang_invoke_DirectMethodHandle, Opt ) \ |
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154 do_klass(MethodHandle_klass, java_lang_invoke_MethodHandle, Pre_JSR292 ) \ |
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155 do_klass(MemberName_klass, java_lang_invoke_MemberName, Pre_JSR292 ) \ |
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156 do_klass(MethodHandleNatives_klass, java_lang_invoke_MethodHandleNatives, Pre_JSR292 ) \ |
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157 do_klass(LambdaForm_klass, java_lang_invoke_LambdaForm, Opt ) \ |
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158 do_klass(MethodType_klass, java_lang_invoke_MethodType, Pre_JSR292 ) \ |
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159 do_klass(BootstrapMethodError_klass, java_lang_BootstrapMethodError, Pre_JSR292 ) \ |
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160 do_klass(CallSite_klass, java_lang_invoke_CallSite, Pre_JSR292 ) \ |
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161 do_klass(ConstantCallSite_klass, java_lang_invoke_ConstantCallSite, Pre_JSR292 ) \ |
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162 do_klass(MutableCallSite_klass, java_lang_invoke_MutableCallSite, Pre_JSR292 ) \ |
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163 do_klass(VolatileCallSite_klass, java_lang_invoke_VolatileCallSite, Pre_JSR292 ) \ |
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164 /* Note: MethodHandle must be first, and VolatileCallSite last in group */ \ |
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165 \ |
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166 do_klass(StringBuffer_klass, java_lang_StringBuffer, Pre ) \ |
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167 do_klass(StringBuilder_klass, java_lang_StringBuilder, Pre ) \ |
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168 do_klass(misc_Unsafe_klass, sun_misc_Unsafe, Pre ) \ |
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169 \ |
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170 /* It's NULL in non-1.4 JDKs. */ \ |
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171 do_klass(StackTraceElement_klass, java_lang_StackTraceElement, Opt ) \ |
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172 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \ |
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173 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \ |
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174 do_klass(nio_Buffer_klass, java_nio_Buffer, Opt ) \ |
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175 \ |
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176 /* Preload boxing klasses */ \ |
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177 do_klass(Boolean_klass, java_lang_Boolean, Pre ) \ |
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178 do_klass(Character_klass, java_lang_Character, Pre ) \ |
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179 do_klass(Float_klass, java_lang_Float, Pre ) \ |
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180 do_klass(Double_klass, java_lang_Double, Pre ) \ |
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181 do_klass(Byte_klass, java_lang_Byte, Pre ) \ |
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182 do_klass(Short_klass, java_lang_Short, Pre ) \ |
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183 do_klass(Integer_klass, java_lang_Integer, Pre ) \ |
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184 do_klass(Long_klass, java_lang_Long, Pre ) \ |
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185 /*end*/ |
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186 |
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187 |
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188 class SystemDictionary : AllStatic { |
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189 friend class VMStructs; |
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190 friend class SystemDictionaryHandles; |
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191 |
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192 public: |
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193 enum WKID { |
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194 NO_WKID = 0, |
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195 |
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196 #define WK_KLASS_ENUM(name, symbol, ignore_o) WK_KLASS_ENUM_NAME(name), WK_KLASS_ENUM_NAME(symbol) = WK_KLASS_ENUM_NAME(name), |
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197 WK_KLASSES_DO(WK_KLASS_ENUM) |
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198 #undef WK_KLASS_ENUM |
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199 |
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200 WKID_LIMIT, |
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201 |
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202 FIRST_WKID = NO_WKID + 1 |
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203 }; |
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204 |
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205 enum InitOption { |
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206 Pre, // preloaded; error if not present |
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207 Pre_JSR292, // preloaded if EnableInvokeDynamic |
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208 |
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209 // Order is significant. Options before this point require resolve_or_fail. |
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210 // Options after this point will use resolve_or_null instead. |
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211 |
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212 Opt, // preload tried; NULL if not present |
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213 Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection |
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214 Opt_Only_JDK15, // preload tried; use only with JDK1.5+ |
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215 OPTION_LIMIT, |
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216 CEIL_LG_OPTION_LIMIT = 4 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT) |
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217 }; |
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218 |
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219 |
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220 // Returns a class with a given class name and class loader. Loads the |
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221 // class if needed. If not found a NoClassDefFoundError or a |
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222 // ClassNotFoundException is thrown, depending on the value on the |
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223 // throw_error flag. For most uses the throw_error argument should be set |
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224 // to true. |
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225 |
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226 static Klass* resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS); |
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227 // Convenient call for null loader and protection domain. |
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228 static Klass* resolve_or_fail(Symbol* class_name, bool throw_error, TRAPS); |
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229 private: |
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230 // handle error translation for resolve_or_null results |
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231 static Klass* handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS); |
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232 |
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233 public: |
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234 |
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235 // Returns a class with a given class name and class loader. |
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236 // Loads the class if needed. If not found NULL is returned. |
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237 static Klass* resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
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238 // Version with null loader and protection domain |
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239 static Klass* resolve_or_null(Symbol* class_name, TRAPS); |
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240 |
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241 // Resolve a superclass or superinterface. Called from ClassFileParser, |
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242 // parse_interfaces, resolve_instance_class_or_null, load_shared_class |
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243 // "child_name" is the class whose super class or interface is being resolved. |
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244 static Klass* resolve_super_or_fail(Symbol* child_name, |
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245 Symbol* class_name, |
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246 Handle class_loader, |
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247 Handle protection_domain, |
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248 bool is_superclass, |
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249 TRAPS); |
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250 |
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251 // Parse new stream. This won't update the system dictionary or |
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252 // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses. |
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253 static Klass* parse_stream(Symbol* class_name, |
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254 Handle class_loader, |
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255 Handle protection_domain, |
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256 ClassFileStream* st, |
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257 TRAPS) { |
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258 KlassHandle nullHandle; |
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259 return parse_stream(class_name, class_loader, protection_domain, st, nullHandle, NULL, THREAD); |
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260 } |
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261 static Klass* parse_stream(Symbol* class_name, |
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262 Handle class_loader, |
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263 Handle protection_domain, |
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264 ClassFileStream* st, |
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265 KlassHandle host_klass, |
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266 GrowableArray<Handle>* cp_patches, |
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267 TRAPS); |
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268 |
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269 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass) |
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270 static Klass* resolve_from_stream(Symbol* class_name, Handle class_loader, |
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271 Handle protection_domain, |
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272 ClassFileStream* st, bool verify, TRAPS); |
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273 |
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274 // Lookup an already loaded class. If not found NULL is returned. |
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275 static Klass* find(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
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276 |
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277 // Lookup an already loaded instance or array class. |
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278 // Do not make any queries to class loaders; consult only the cache. |
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279 // If not found NULL is returned. |
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280 static Klass* find_instance_or_array_klass(Symbol* class_name, |
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281 Handle class_loader, |
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282 Handle protection_domain, |
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283 TRAPS); |
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284 |
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285 // Lookup an instance or array class that has already been loaded |
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286 // either into the given class loader, or else into another class |
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287 // loader that is constrained (via loader constraints) to produce |
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288 // a consistent class. Do not take protection domains into account. |
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289 // Do not make any queries to class loaders; consult only the cache. |
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290 // Return NULL if the class is not found. |
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291 // |
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292 // This function is a strict superset of find_instance_or_array_klass. |
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293 // This function (the unchecked version) makes a conservative prediction |
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294 // of the result of the checked version, assuming successful lookup. |
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295 // If both functions return non-null, they must return the same value. |
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296 // Also, the unchecked version may sometimes be non-null where the |
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297 // checked version is null. This can occur in several ways: |
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298 // 1. No query has yet been made to the class loader. |
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299 // 2. The class loader was queried, but chose not to delegate. |
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300 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain. |
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301 // 4. Loading was attempted, but there was a linkage error of some sort. |
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302 // In all of these cases, the loader constraints on this type are |
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303 // satisfied, and it is safe for classes in the given class loader |
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304 // to manipulate strongly-typed values of the found class, subject |
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305 // to local linkage and access checks. |
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306 static Klass* find_constrained_instance_or_array_klass(Symbol* class_name, |
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307 Handle class_loader, |
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308 TRAPS); |
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309 |
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310 // Iterate over all klasses in dictionary |
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311 // Just the classes from defining class loaders |
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312 static void classes_do(void f(Klass*)); |
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313 // Added for initialize_itable_for_klass to handle exceptions |
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314 static void classes_do(void f(Klass*, TRAPS), TRAPS); |
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315 // All classes, and their class loaders |
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316 static void classes_do(void f(Klass*, ClassLoaderData*)); |
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317 |
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318 static void placeholders_do(void f(Symbol*)); |
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319 |
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320 // Iterate over all methods in all klasses in dictionary |
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321 static void methods_do(void f(Method*)); |
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322 |
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323 // Garbage collection support |
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324 |
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325 // This method applies "blk->do_oop" to all the pointers to "system" |
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326 // classes and loaders. |
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327 static void always_strong_oops_do(OopClosure* blk); |
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328 static void always_strong_classes_do(KlassClosure* closure); |
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329 |
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330 // Unload (that is, break root links to) all unmarked classes and |
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331 // loaders. Returns "true" iff something was unloaded. |
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332 static bool do_unloading(BoolObjectClosure* is_alive); |
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333 |
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334 static int calculate_systemdictionary_size(int loadedclasses); |
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335 |
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336 // Applies "f->do_oop" to all root oops in the system dictionary. |
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337 static void oops_do(OopClosure* f); |
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338 |
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339 // System loader lock |
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340 static oop system_loader_lock() { return _system_loader_lock_obj; } |
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341 |
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342 private: |
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343 // Extended Redefine classes support (tbi) |
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344 static void preloaded_classes_do(KlassClosure* f); |
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345 static void lazily_loaded_classes_do(KlassClosure* f); |
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346 public: |
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347 // Sharing support. |
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348 static void reorder_dictionary(); |
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349 static void copy_buckets(char** top, char* end); |
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350 static void copy_table(char** top, char* end); |
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351 static void reverse(); |
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352 static void set_shared_dictionary(HashtableBucket<mtClass>* t, int length, |
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353 int number_of_entries); |
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354 // Printing |
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355 static void print() PRODUCT_RETURN; |
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356 static void print_class_statistics() PRODUCT_RETURN; |
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357 static void print_method_statistics() PRODUCT_RETURN; |
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358 |
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359 // Number of contained klasses |
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360 // This is both fully loaded classes and classes in the process |
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361 // of being loaded |
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362 static int number_of_classes(); |
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363 |
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364 // Monotonically increasing counter which grows as classes are |
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365 // loaded or modifications such as hot-swapping or setting/removing |
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366 // of breakpoints are performed |
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367 static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; } |
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368 // Needed by evolution and breakpoint code |
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369 static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; } |
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370 |
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371 // Verification |
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372 static void verify(); |
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373 |
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374 #ifdef ASSERT |
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375 static bool is_internal_format(Symbol* class_name); |
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376 #endif |
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377 |
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378 // Initialization |
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379 static void initialize(TRAPS); |
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380 |
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381 // Fast access to commonly used classes (preloaded) |
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382 static Klass* check_klass(Klass* k) { |
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383 assert(k != NULL, "preloaded klass not initialized"); |
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384 return k; |
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385 } |
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386 |
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387 static Klass* check_klass_Pre( Klass* k) { return check_klass(k); } |
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388 static Klass* check_klass_Pre_JSR292(Klass* k) { return EnableInvokeDynamic ? check_klass(k) : k; } |
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389 static Klass* check_klass_Opt( Klass* k) { return k; } |
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390 static Klass* check_klass_Opt_Only_JDK15(Klass* k) { |
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391 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only"); |
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392 return k; |
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393 } |
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394 static Klass* check_klass_Opt_Only_JDK14NewRef(Klass* k) { |
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395 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only"); |
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396 // despite the optional loading, if you use this it must be present: |
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397 return check_klass(k); |
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398 } |
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399 |
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400 static bool initialize_wk_klass(WKID id, int init_opt, TRAPS); |
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401 static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS); |
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402 static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) { |
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403 int limit = (int)end_id + 1; |
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404 initialize_wk_klasses_until((WKID) limit, start_id, THREAD); |
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405 } |
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406 |
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407 public: |
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408 #define WK_KLASS_DECLARE(name, symbol, option) \ |
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409 static Klass* name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } \ |
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410 static Klass** name##_addr() { \ |
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411 return &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \ |
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412 } |
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413 WK_KLASSES_DO(WK_KLASS_DECLARE); |
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414 #undef WK_KLASS_DECLARE |
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415 |
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416 static Klass* well_known_klass(WKID id) { |
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417 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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418 return _well_known_klasses[id]; |
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419 } |
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420 |
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421 static Klass** well_known_klass_addr(WKID id) { |
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422 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
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423 return &_well_known_klasses[id]; |
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424 } |
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425 |
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426 // Local definition for direct access to the private array: |
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427 #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)] |
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428 |
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429 static Klass* box_klass(BasicType t) { |
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430 assert((uint)t < T_VOID+1, "range check"); |
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431 return check_klass(_box_klasses[t]); |
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432 } |
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433 static BasicType box_klass_type(Klass* k); // inverse of box_klass |
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434 |
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435 // methods returning lazily loaded klasses |
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436 // The corresponding method to load the class must be called before calling them. |
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437 static Klass* abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); } |
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438 |
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439 static void load_abstract_ownable_synchronizer_klass(TRAPS); |
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440 |
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441 private: |
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442 // Tells whether ClassLoader.loadClassInternal is present |
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443 static bool has_loadClassInternal() { return _has_loadClassInternal; } |
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444 |
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445 // Returns the class loader data to be used when looking up/updating the |
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446 // system dictionary. |
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447 static ClassLoaderData *class_loader_data(Handle class_loader) { |
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448 return ClassLoaderData::class_loader_data(class_loader()); |
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449 } |
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450 |
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451 public: |
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452 // Tells whether ClassLoader.checkPackageAccess is present |
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453 static bool has_checkPackageAccess() { return _has_checkPackageAccess; } |
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454 |
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455 static bool Parameter_klass_loaded() { return WK_KLASS(reflect_Parameter_klass) != NULL; } |
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456 static bool Class_klass_loaded() { return WK_KLASS(Class_klass) != NULL; } |
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457 static bool Cloneable_klass_loaded() { return WK_KLASS(Cloneable_klass) != NULL; } |
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458 static bool Object_klass_loaded() { return WK_KLASS(Object_klass) != NULL; } |
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459 static bool ClassLoader_klass_loaded() { return WK_KLASS(ClassLoader_klass) != NULL; } |
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460 |
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461 // Returns default system loader |
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462 static oop java_system_loader(); |
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463 |
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464 // Compute the default system loader |
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465 static void compute_java_system_loader(TRAPS); |
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466 |
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467 // Register a new class loader |
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468 static ClassLoaderData* register_loader(Handle class_loader, TRAPS); |
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469 private: |
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470 // Mirrors for primitive classes (created eagerly) |
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471 static oop check_mirror(oop m) { |
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472 assert(m != NULL, "mirror not initialized"); |
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473 return m; |
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474 } |
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475 |
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476 public: |
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477 // Note: java_lang_Class::primitive_type is the inverse of java_mirror |
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478 |
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479 // Check class loader constraints |
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480 static bool add_loader_constraint(Symbol* name, Handle loader1, |
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481 Handle loader2, TRAPS); |
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482 static Symbol* check_signature_loaders(Symbol* signature, Handle loader1, |
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483 Handle loader2, bool is_method, TRAPS); |
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484 |
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485 // JSR 292 |
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486 // find a java.lang.invoke.MethodHandle.invoke* method for a given signature |
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487 // (asks Java to compute it if necessary, except in a compiler thread) |
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488 static methodHandle find_method_handle_invoker(Symbol* name, |
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489 Symbol* signature, |
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490 KlassHandle accessing_klass, |
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491 Handle *appendix_result, |
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492 Handle *method_type_result, |
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493 TRAPS); |
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494 // for a given signature, find the internal MethodHandle method (linkTo* or invokeBasic) |
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495 // (does not ask Java, since this is a low-level intrinsic defined by the JVM) |
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496 static methodHandle find_method_handle_intrinsic(vmIntrinsics::ID iid, |
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497 Symbol* signature, |
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498 TRAPS); |
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499 // find a java.lang.invoke.MethodType object for a given signature |
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500 // (asks Java to compute it if necessary, except in a compiler thread) |
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501 static Handle find_method_handle_type(Symbol* signature, |
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502 KlassHandle accessing_klass, |
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503 TRAPS); |
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504 |
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505 // ask Java to compute a java.lang.invoke.MethodHandle object for a given CP entry |
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506 static Handle link_method_handle_constant(KlassHandle caller, |
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507 int ref_kind, //e.g., JVM_REF_invokeVirtual |
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508 KlassHandle callee, |
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509 Symbol* name, |
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510 Symbol* signature, |
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511 TRAPS); |
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512 |
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513 // ask Java to create a dynamic call site, while linking an invokedynamic op |
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514 static methodHandle find_dynamic_call_site_invoker(KlassHandle caller, |
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515 Handle bootstrap_method, |
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516 Symbol* name, |
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517 Symbol* type, |
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518 Handle *appendix_result, |
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519 Handle *method_type_result, |
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520 TRAPS); |
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521 |
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522 // Utility for printing loader "name" as part of tracing constraints |
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523 static const char* loader_name(oop loader) { |
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524 return ((loader) == NULL ? "<bootloader>" : |
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525 InstanceKlass::cast((loader)->klass())->name()->as_C_string() ); |
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526 } |
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527 static const char* loader_name(ClassLoaderData* loader_data) { |
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528 return (loader_data->class_loader() == NULL ? "<bootloader>" : |
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529 InstanceKlass::cast((loader_data->class_loader())->klass())->name()->as_C_string() ); |
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530 } |
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531 |
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532 // Record the error when the first attempt to resolve a reference from a constant |
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533 // pool entry to a class fails. |
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534 static void add_resolution_error(constantPoolHandle pool, int which, Symbol* error); |
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535 static void delete_resolution_error(ConstantPool* pool); |
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536 static Symbol* find_resolution_error(constantPoolHandle pool, int which); |
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537 |
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538 private: |
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539 |
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540 enum Constants { |
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541 _loader_constraint_size = 107, // number of entries in constraint table |
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542 _resolution_error_size = 107, // number of entries in resolution error table |
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543 _invoke_method_size = 139, // number of entries in invoke method table |
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544 _nof_buckets = 1009, // number of buckets in hash table for placeholders |
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545 _old_default_sdsize = 1009, // backward compat for system dictionary size |
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546 _prime_array_size = 8, // array of primes for system dictionary size |
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547 _average_depth_goal = 3 // goal for lookup length |
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548 }; |
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549 |
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550 |
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551 // Static variables |
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552 |
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553 // hashtable sizes for system dictionary to allow growth |
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554 // prime numbers for system dictionary size |
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555 static int _sdgeneration; |
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556 static const int _primelist[_prime_array_size]; |
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557 |
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558 // Hashtable holding loaded classes. |
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559 static Dictionary* _dictionary; |
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560 |
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561 // Hashtable holding placeholders for classes being loaded. |
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562 static PlaceholderTable* _placeholders; |
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563 |
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564 // Hashtable holding classes from the shared archive. |
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565 static Dictionary* _shared_dictionary; |
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566 |
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567 // Monotonically increasing counter which grows with |
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568 // _number_of_classes as well as hot-swapping and breakpoint setting |
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569 // and removal. |
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570 static int _number_of_modifications; |
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571 |
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572 // Lock object for system class loader |
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573 static oop _system_loader_lock_obj; |
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574 |
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575 // Constraints on class loaders |
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576 static LoaderConstraintTable* _loader_constraints; |
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577 |
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578 // Resolution errors |
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579 static ResolutionErrorTable* _resolution_errors; |
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580 |
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581 // Invoke methods (JSR 292) |
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582 static SymbolPropertyTable* _invoke_method_table; |
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583 |
|
584 public: |
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585 // for VM_CounterDecay iteration support |
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586 friend class CounterDecay; |
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587 static Klass* try_get_next_class(); |
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588 |
|
589 private: |
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590 static void validate_protection_domain(instanceKlassHandle klass, |
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591 Handle class_loader, |
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592 Handle protection_domain, TRAPS); |
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593 |
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594 friend class VM_PopulateDumpSharedSpace; |
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595 friend class TraversePlaceholdersClosure; |
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596 static Dictionary* dictionary() { return _dictionary; } |
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597 static Dictionary* shared_dictionary() { return _shared_dictionary; } |
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598 static PlaceholderTable* placeholders() { return _placeholders; } |
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599 static LoaderConstraintTable* constraints() { return _loader_constraints; } |
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600 static ResolutionErrorTable* resolution_errors() { return _resolution_errors; } |
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601 static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; } |
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602 |
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603 // Basic loading operations |
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604 static Klass* resolve_instance_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
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605 static Klass* resolve_array_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
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606 static instanceKlassHandle handle_parallel_super_load(Symbol* class_name, Symbol* supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS); |
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607 // Wait on SystemDictionary_lock; unlocks lockObject before |
|
608 // waiting; relocks lockObject with correct recursion count |
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609 // after waiting, but before reentering SystemDictionary_lock |
|
610 // to preserve lock order semantics. |
|
611 static void double_lock_wait(Handle lockObject, TRAPS); |
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612 static void define_instance_class(instanceKlassHandle k, TRAPS); |
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613 static instanceKlassHandle find_or_define_instance_class(Symbol* class_name, |
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614 Handle class_loader, |
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615 instanceKlassHandle k, TRAPS); |
|
616 static instanceKlassHandle load_shared_class(Symbol* class_name, |
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617 Handle class_loader, TRAPS); |
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618 static instanceKlassHandle load_shared_class(instanceKlassHandle ik, |
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619 Handle class_loader, TRAPS); |
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620 static instanceKlassHandle load_instance_class(Symbol* class_name, Handle class_loader, TRAPS); |
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621 static Handle compute_loader_lock_object(Handle class_loader, TRAPS); |
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622 static void check_loader_lock_contention(Handle loader_lock, TRAPS); |
|
623 static bool is_parallelCapable(Handle class_loader); |
|
624 static bool is_parallelDefine(Handle class_loader); |
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625 |
|
626 public: |
|
627 static bool is_ext_class_loader(Handle class_loader); |
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628 |
|
629 private: |
|
630 static Klass* find_shared_class(Symbol* class_name); |
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631 |
|
632 // Setup link to hierarchy |
|
633 static void add_to_hierarchy(instanceKlassHandle k, TRAPS); |
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634 |
|
635 // event based tracing |
|
636 static void post_class_load_event(const Ticks& start_time, instanceKlassHandle k, |
|
637 Handle initiating_loader); |
|
638 // We pass in the hashtable index so we can calculate it outside of |
|
639 // the SystemDictionary_lock. |
|
640 |
|
641 // Basic find on loaded classes |
|
642 static Klass* find_class(int index, unsigned int hash, |
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643 Symbol* name, ClassLoaderData* loader_data); |
|
644 static Klass* find_class(Symbol* class_name, ClassLoaderData* loader_data); |
|
645 |
|
646 // Basic find on classes in the midst of being loaded |
|
647 static Symbol* find_placeholder(Symbol* name, ClassLoaderData* loader_data); |
|
648 |
|
649 // Updating entry in dictionary |
|
650 // Add a completely loaded class |
|
651 static void add_klass(int index, Symbol* class_name, |
|
652 ClassLoaderData* loader_data, KlassHandle obj); |
|
653 |
|
654 // Add a placeholder for a class being loaded |
|
655 static void add_placeholder(int index, |
|
656 Symbol* class_name, |
|
657 ClassLoaderData* loader_data); |
|
658 static void remove_placeholder(int index, |
|
659 Symbol* class_name, |
|
660 ClassLoaderData* loader_data); |
|
661 |
|
662 // Performs cleanups after resolve_super_or_fail. This typically needs |
|
663 // to be called on failure. |
|
664 // Won't throw, but can block. |
|
665 static void resolution_cleanups(Symbol* class_name, |
|
666 ClassLoaderData* loader_data, |
|
667 TRAPS); |
|
668 |
|
669 // Initialization |
|
670 static void initialize_preloaded_classes(TRAPS); |
|
671 |
|
672 // Class loader constraints |
|
673 static void check_constraints(int index, unsigned int hash, |
|
674 instanceKlassHandle k, Handle loader, |
|
675 bool defining, TRAPS); |
|
676 static void update_dictionary(int d_index, unsigned int d_hash, |
|
677 int p_index, unsigned int p_hash, |
|
678 instanceKlassHandle k, Handle loader, |
|
679 TRAPS); |
|
680 |
|
681 // Variables holding commonly used klasses (preloaded) |
|
682 static Klass* _well_known_klasses[]; |
|
683 |
|
684 // Lazily loaded klasses |
|
685 static Klass* volatile _abstract_ownable_synchronizer_klass; |
|
686 |
|
687 // table of box klasses (int_klass, etc.) |
|
688 static Klass* _box_klasses[T_VOID+1]; |
|
689 |
|
690 static oop _java_system_loader; |
|
691 |
|
692 static bool _has_loadClassInternal; |
|
693 static bool _has_checkPackageAccess; |
|
694 }; |
|
695 |
|
696 #endif // SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP |