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annotate src/share/vm/classfile/systemDictionary.hpp @ 6847:65d07d9ee446

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8000263: JSR 292: signature types may appear to be unloaded Reviewed-by: kvn, jrose
author twisti
date Mon, 08 Oct 2012 17:04:00 -0700
parents f6b0eb4e44cf
children 19eb999cb72c
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1 /*
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2 * Copyright (c) 1997, 2012, 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 // The system dictionary stores all loaded classes and maps:
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38 //
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39 // [class name,class loader] -> class i.e. [Symbol*,oop] -> Klass*
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40 //
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41 // Classes are loaded lazily. The default VM class loader is
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42 // represented as NULL.
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43
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44 // The underlying data structure is an open hash table with a fixed number
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45 // of buckets. During loading the loader object is locked, (for the VM loader
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46 // a private lock object is used). Class loading can thus be done concurrently,
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47 // but only by different loaders.
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48 //
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49 // During loading a placeholder (name, loader) is temporarily placed in
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50 // a side data structure, and is used to detect ClassCircularityErrors
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51 // and to perform verification during GC. A GC can occur in the midst
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52 // of class loading, as we call out to Java, have to take locks, etc.
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53 //
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54 // When class loading is finished, a new entry is added to the system
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55 // dictionary and the place holder is removed. Note that the protection
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56 // domain field of the system dictionary has not yet been filled in when
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57 // the "real" system dictionary entry is created.
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58 //
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59 // Clients of this class who are interested in finding if a class has
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60 // been completely loaded -- not classes in the process of being loaded --
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61 // can read the SystemDictionary unlocked. This is safe because
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62 // - entries are only deleted at safepoints
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63 // - readers cannot come to a safepoint while actively examining
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64 // an entry (an entry cannot be deleted from under a reader)
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65 // - entries must be fully formed before they are available to concurrent
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66 // readers (we must ensure write ordering)
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67 //
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68 // Note that placeholders are deleted at any time, as they are removed
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69 // when a class is completely loaded. Therefore, readers as well as writers
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70 // of placeholders must hold the SystemDictionary_lock.
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71 //
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72
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73 class Dictionary;
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74 class PlaceholderTable;
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75 class LoaderConstraintTable;
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76 template <MEMFLAGS F> class HashtableBucket;
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77 class ResolutionErrorTable;
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78 class SymbolPropertyTable;
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79
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80 // Certain classes are preloaded, such as java.lang.Object and java.lang.String.
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81 // They are all "well-known", in the sense that no class loader is allowed
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82 // to provide a different definition.
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83 //
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84 // These klasses must all have names defined in vmSymbols.
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85
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86 #define WK_KLASS_ENUM_NAME(kname) kname##_knum
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87
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88 // Each well-known class has a short klass name (like object_klass),
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89 // a vmSymbol name (like java_lang_Object), and a flag word
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90 // that makes some minor distinctions, like whether the klass
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91 // is preloaded, optional, release-specific, etc.
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92 // The order of these definitions is significant; it is the order in which
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93 // preloading is actually performed by initialize_preloaded_classes.
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94
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95 #define WK_KLASSES_DO(do_klass) \
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96 /* well-known classes */ \
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97 do_klass(Object_klass, java_lang_Object, Pre_Link ) \
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98 do_klass(String_klass, java_lang_String, Pre_Link ) \
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99 do_klass(Class_klass, java_lang_Class, Pre_Link ) \
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100 do_klass(Cloneable_klass, java_lang_Cloneable, Pre_Link ) \
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101 do_klass(ClassLoader_klass, java_lang_ClassLoader, Pre_Link ) \
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102 do_klass(Serializable_klass, java_io_Serializable, Pre_Link ) \
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103 do_klass(System_klass, java_lang_System, Pre_Link ) \
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104 do_klass(Throwable_klass, java_lang_Throwable, Pre_Link ) \
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105 do_klass(Error_klass, java_lang_Error, Pre_Link ) \
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106 do_klass(ThreadDeath_klass, java_lang_ThreadDeath, Pre_Link ) \
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107 do_klass(Exception_klass, java_lang_Exception, Pre_Link ) \
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108 do_klass(RuntimeException_klass, java_lang_RuntimeException, Pre_Link ) \
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109 do_klass(ProtectionDomain_klass, java_security_ProtectionDomain, Pre_Link ) \
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110 do_klass(AccessControlContext_klass, java_security_AccessControlContext, Pre_Link ) \
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111 do_klass(ClassNotFoundException_klass, java_lang_ClassNotFoundException, Pre_Link ) \
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112 do_klass(NoClassDefFoundError_klass, java_lang_NoClassDefFoundError, Pre_Link ) \
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113 do_klass(LinkageError_klass, java_lang_LinkageError, Pre_Link ) \
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114 do_klass(ClassCastException_klass, java_lang_ClassCastException, Pre_Link ) \
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115 do_klass(ArrayStoreException_klass, java_lang_ArrayStoreException, Pre_Link ) \
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116 do_klass(VirtualMachineError_klass, java_lang_VirtualMachineError, Pre_Link ) \
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117 do_klass(OutOfMemoryError_klass, java_lang_OutOfMemoryError, Pre_Link ) \
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118 do_klass(StackOverflowError_klass, java_lang_StackOverflowError, Pre_Link ) \
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119 do_klass(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre_Link ) \
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120 do_klass(Reference_klass, java_lang_ref_Reference, Pre_Link ) \
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121 \
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122 /* Preload ref klasses and set reference types */ \
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123 do_klass(SoftReference_klass, java_lang_ref_SoftReference, Pre_Link ) \
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124 do_klass(WeakReference_klass, java_lang_ref_WeakReference, Pre_Link ) \
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125 do_klass(FinalReference_klass, java_lang_ref_FinalReference, Pre ) \
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126 do_klass(PhantomReference_klass, java_lang_ref_PhantomReference, Pre_Link ) \
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127 do_klass(Finalizer_klass, java_lang_ref_Finalizer, Pre ) \
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128 \
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129 do_klass(Thread_klass, java_lang_Thread, Pre_Link ) \
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130 do_klass(ThreadGroup_klass, java_lang_ThreadGroup, Pre_Link ) \
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131 do_klass(Properties_klass, java_util_Properties, Pre_Link ) \
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132 do_klass(reflect_AccessibleObject_klass, java_lang_reflect_AccessibleObject, Pre_Link ) \
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133 do_klass(reflect_Field_klass, java_lang_reflect_Field, Pre_Link ) \
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134 do_klass(reflect_Method_klass, java_lang_reflect_Method, Pre_Link ) \
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135 do_klass(reflect_Constructor_klass, java_lang_reflect_Constructor, Pre_Link ) \
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136 \
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137 /* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \
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138 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
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139 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
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140 do_klass(reflect_MagicAccessorImpl_klass, sun_reflect_MagicAccessorImpl, Opt ) \
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141 do_klass(reflect_MethodAccessorImpl_klass, sun_reflect_MethodAccessorImpl, Opt_Only_JDK14NewRef) \
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142 do_klass(reflect_ConstructorAccessorImpl_klass, sun_reflect_ConstructorAccessorImpl, Opt_Only_JDK14NewRef) \
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143 do_klass(reflect_DelegatingClassLoader_klass, sun_reflect_DelegatingClassLoader, Opt ) \
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144 do_klass(reflect_ConstantPool_klass, sun_reflect_ConstantPool, Opt_Only_JDK15 ) \
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145 do_klass(reflect_UnsafeStaticFieldAccessorImpl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15 ) \
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146 \
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147 /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \
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148 do_klass(MethodHandle_klass, java_lang_invoke_MethodHandle, Pre_Link ) \
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149 do_klass(MemberName_klass, java_lang_invoke_MemberName, Pre ) \
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150 do_klass(MethodHandleNatives_klass, java_lang_invoke_MethodHandleNatives, Pre ) \
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151 do_klass(LambdaForm_klass, java_lang_invoke_LambdaForm, Opt ) \
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152 do_klass(MethodType_klass, java_lang_invoke_MethodType, Pre_Link ) \
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153 do_klass(BootstrapMethodError_klass, java_lang_BootstrapMethodError, Pre_Link ) \
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154 do_klass(CallSite_klass, java_lang_invoke_CallSite, Pre_Link ) \
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155 do_klass(ConstantCallSite_klass, java_lang_invoke_ConstantCallSite, Pre_Link ) \
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156 do_klass(MutableCallSite_klass, java_lang_invoke_MutableCallSite, Pre_Link ) \
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157 do_klass(VolatileCallSite_klass, java_lang_invoke_VolatileCallSite, Pre_Link ) \
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158 /* Note: MethodHandle must be first, and VolatileCallSite last in group */ \
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159 \
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160 do_klass(StringBuffer_klass, java_lang_StringBuffer, Pre_Link ) \
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161 do_klass(StringBuilder_klass, java_lang_StringBuilder, Pre_Link ) \
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162 \
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163 /* It's NULL in non-1.4 JDKs. */ \
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164 do_klass(StackTraceElement_klass, java_lang_StackTraceElement, Opt ) \
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165 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
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166 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
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167 do_klass(nio_Buffer_klass, java_nio_Buffer, Opt ) \
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168 \
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169 do_klass(DownloadManager_klass, sun_jkernel_DownloadManager, Opt_Kernel ) \
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170 \
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171 do_klass(PostVMInitHook_klass, sun_misc_PostVMInitHook, Opt ) \
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172 \
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173 /* Preload boxing klasses */ \
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174 do_klass(Boolean_klass, java_lang_Boolean, Pre_Link ) \
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175 do_klass(Character_klass, java_lang_Character, Pre_Link ) \
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176 do_klass(Float_klass, java_lang_Float, Pre_Link ) \
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177 do_klass(Double_klass, java_lang_Double, Pre_Link ) \
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178 do_klass(Byte_klass, java_lang_Byte, Pre_Link ) \
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179 do_klass(Short_klass, java_lang_Short, Pre_Link ) \
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180 do_klass(Integer_klass, java_lang_Integer, Pre_Link ) \
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181 do_klass(Long_klass, java_lang_Long, Pre_Link ) \
132
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182 /*end*/
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183
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184
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185 class SystemDictionary : AllStatic {
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186 friend class VMStructs;
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187 friend class SystemDictionaryHandles;
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188
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189 public:
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190 enum WKID {
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191 NO_WKID = 0,
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192
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193 #define WK_KLASS_ENUM(name, symbol, ignore_o) WK_KLASS_ENUM_NAME(name), WK_KLASS_ENUM_NAME(symbol) = WK_KLASS_ENUM_NAME(name),
132
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194 WK_KLASSES_DO(WK_KLASS_ENUM)
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195 #undef WK_KLASS_ENUM
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196
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197 WKID_LIMIT,
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198
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199 FIRST_WKID = NO_WKID + 1
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200 };
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201
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202 enum InitOption {
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203 Pre, // preloaded; error if not present
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204 Pre_Link, // preloaded; error if not present; link as well-known
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205
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206 // Order is significant. Options before this point require resolve_or_fail.
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207 // Options after this point will use resolve_or_null instead.
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208
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209 Opt, // preload tried; NULL if not present
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210 Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection
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211 Opt_Only_JDK15, // preload tried; use only with JDK1.5+
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212 Opt_Kernel, // preload tried only #ifdef KERNEL
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213 OPTION_LIMIT,
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214 CEIL_LG_OPTION_LIMIT = 4 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT)
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215 };
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216
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217
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218 // Returns a class with a given class name and class loader. Loads the
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219 // class if needed. If not found a NoClassDefFoundError or a
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220 // ClassNotFoundException is thrown, depending on the value on the
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221 // throw_error flag. For most uses the throw_error argument should be set
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222 // to true.
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223
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224 static Klass* resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS);
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225 // Convenient call for null loader and protection domain.
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226 static Klass* resolve_or_fail(Symbol* class_name, bool throw_error, TRAPS);
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227 private:
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228 // handle error translation for resolve_or_null results
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229 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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230
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231 public:
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232
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233 // Returns a class with a given class name and class loader.
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234 // Loads the class if needed. If not found NULL is returned.
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235 static Klass* resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
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236 // Version with null loader and protection domain
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237 static Klass* resolve_or_null(Symbol* class_name, TRAPS);
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238
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239 // Resolve a superclass or superinterface. Called from ClassFileParser,
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240 // parse_interfaces, resolve_instance_class_or_null, load_shared_class
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241 // "child_name" is the class whose super class or interface is being resolved.
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242 static Klass* resolve_super_or_fail(Symbol* child_name,
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243 Symbol* class_name,
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244 Handle class_loader,
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245 Handle protection_domain,
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246 bool is_superclass,
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247 TRAPS);
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248
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249 // Parse new stream. This won't update the system dictionary or
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250 // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses.
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251 static Klass* parse_stream(Symbol* class_name,
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252 Handle class_loader,
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253 Handle protection_domain,
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254 ClassFileStream* st,
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255 TRAPS) {
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256 KlassHandle nullHandle;
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257 return parse_stream(class_name, class_loader, protection_domain, st, nullHandle, NULL, THREAD);
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258 }
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259 static Klass* parse_stream(Symbol* class_name,
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260 Handle class_loader,
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261 Handle protection_domain,
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262 ClassFileStream* st,
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263 KlassHandle host_klass,
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264 GrowableArray<Handle>* cp_patches,
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265 TRAPS);
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266
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267 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass)
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268 static Klass* resolve_from_stream(Symbol* class_name, Handle class_loader,
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269 Handle protection_domain,
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270 ClassFileStream* st, bool verify, TRAPS);
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271
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272 // Lookup an already loaded class. If not found NULL is returned.
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273 static Klass* find(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
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274
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275 // Lookup an already loaded instance or array class.
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276 // Do not make any queries to class loaders; consult only the cache.
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277 // If not found NULL is returned.
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278 static Klass* find_instance_or_array_klass(Symbol* class_name,
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279 Handle class_loader,
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280 Handle protection_domain,
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281 TRAPS);
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282
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283 // If the given name is known to vmSymbols, return the well-know klass:
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284 static Klass* find_well_known_klass(Symbol* class_name);
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285
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286 // Lookup an instance or array class that has already been loaded
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287 // either into the given class loader, or else into another class
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288 // loader that is constrained (via loader constraints) to produce
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289 // a consistent class. Do not take protection domains into account.
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290 // Do not make any queries to class loaders; consult only the cache.
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291 // Return NULL if the class is not found.
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292 //
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293 // This function is a strict superset of find_instance_or_array_klass.
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294 // This function (the unchecked version) makes a conservative prediction
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295 // of the result of the checked version, assuming successful lookup.
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296 // If both functions return non-null, they must return the same value.
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297 // Also, the unchecked version may sometimes be non-null where the
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298 // checked version is null. This can occur in several ways:
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299 // 1. No query has yet been made to the class loader.
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300 // 2. The class loader was queried, but chose not to delegate.
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301 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain.
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302 // 4. Loading was attempted, but there was a linkage error of some sort.
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303 // In all of these cases, the loader constraints on this type are
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304 // satisfied, and it is safe for classes in the given class loader
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305 // to manipulate strongly-typed values of the found class, subject
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306 // to local linkage and access checks.
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307 static Klass* find_constrained_instance_or_array_klass(Symbol* class_name,
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308 Handle class_loader,
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309 TRAPS);
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310
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311 // Iterate over all klasses in dictionary
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312 // Just the classes from defining class loaders
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313 static void classes_do(void f(Klass*));
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314 // Added for initialize_itable_for_klass to handle exceptions
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315 static void classes_do(void f(Klass*, TRAPS), TRAPS);
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316 // All classes, and their class loaders
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317 static void classes_do(void f(Klass*, ClassLoaderData*));
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318 // All classes, and their class loaders
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319 // (added for helpers that use HandleMarks and ResourceMarks)
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320 static void classes_do(void f(Klass*, ClassLoaderData*, TRAPS), TRAPS);
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321 // All entries in the placeholder table and their class loaders
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322 static void placeholders_do(void f(Symbol*));
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323
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324 // Iterate over all methods in all klasses in dictionary
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325 static void methods_do(void f(Method*));
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326
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327 // Garbage collection support
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328
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329 // This method applies "blk->do_oop" to all the pointers to "system"
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330 // classes and loaders.
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331 static void always_strong_oops_do(OopClosure* blk);
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332 static void always_strong_classes_do(KlassClosure* closure);
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333
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334 // Unload (that is, break root links to) all unmarked classes and
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335 // loaders. Returns "true" iff something was unloaded.
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336 static bool do_unloading(BoolObjectClosure* is_alive);
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337
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338 static int calculate_systemdictionary_size(int loadedclasses);
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339
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340 // Applies "f->do_oop" to all root oops in the system dictionary.
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341 static void oops_do(OopClosure* f);
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342
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343 // System loader lock
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344 static oop system_loader_lock() { return _system_loader_lock_obj; }
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345
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346 private:
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347 // Extended Redefine classes support (tbi)
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348 static void preloaded_classes_do(KlassClosure* f);
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349 static void lazily_loaded_classes_do(KlassClosure* f);
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350 public:
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351 // Sharing support.
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352 static void reorder_dictionary();
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353 static void copy_buckets(char** top, char* end);
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354 static void copy_table(char** top, char* end);
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355 static void reverse();
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356 static void set_shared_dictionary(HashtableBucket<mtClass>* t, int length,
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357 int number_of_entries);
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358 // Printing
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359 static void print() PRODUCT_RETURN;
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360 static void print_class_statistics() PRODUCT_RETURN;
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361 static void print_method_statistics() PRODUCT_RETURN;
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362
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363 // Number of contained klasses
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364 // This is both fully loaded classes and classes in the process
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365 // of being loaded
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366 static int number_of_classes();
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367
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368 // Monotonically increasing counter which grows as classes are
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369 // loaded or modifications such as hot-swapping or setting/removing
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370 // of breakpoints are performed
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371 static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; }
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372 // Needed by evolution and breakpoint code
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373 static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; }
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374
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375 // Verification
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376 static void verify();
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377
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378 #ifdef ASSERT
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379 static bool is_internal_format(Symbol* class_name);
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380 #endif
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381
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382 // Verify class is in dictionary
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383 static void verify_obj_klass_present(Symbol* class_name,
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384 ClassLoaderData* loader_data);
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385
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386 // Initialization
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387 static void initialize(TRAPS);
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388
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389 // Fast access to commonly used classes (preloaded)
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390 static Klass* check_klass(Klass* k) {
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391 assert(k != NULL, "preloaded klass not initialized");
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392 return k;
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393 }
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394
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395 static Klass* check_klass_Pre( Klass* k) { return check_klass(k); }
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396 static Klass* check_klass_Pre_Link( Klass* k) { return check_klass(k); }
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397 static Klass* check_klass_Opt( Klass* k) { return k; }
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398 static Klass* check_klass_Opt_Kernel(Klass* k) { return k; } //== Opt
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399 static Klass* check_klass_Opt_Only_JDK15(Klass* k) {
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400 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only");
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401 return k;
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402 }
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403 static Klass* check_klass_Opt_Only_JDK14NewRef(Klass* k) {
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404 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only");
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405 // despite the optional loading, if you use this it must be present:
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406 return check_klass(k);
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407 }
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408
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409 static bool initialize_wk_klass(WKID id, int init_opt, TRAPS);
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410 static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS);
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411 static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) {
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412 int limit = (int)end_id + 1;
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413 initialize_wk_klasses_until((WKID) limit, start_id, THREAD);
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414 }
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415
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416 static void check_wk_pre_link_klasses() NOT_DEBUG_RETURN;
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417
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418 public:
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419 #define WK_KLASS_DECLARE(name, symbol, option) \
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420 static Klass* name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } \
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421 static Klass** name##_addr() { \
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422 return &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \
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423 }
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424 WK_KLASSES_DO(WK_KLASS_DECLARE);
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425 #undef WK_KLASS_DECLARE
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426
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427 static Klass* well_known_klass(WKID id) {
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428 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob");
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429 return _well_known_klasses[id];
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430 }
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431
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432 static Klass** well_known_klass_addr(WKID id) {
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433 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob");
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434 return &_well_known_klasses[id];
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435 }
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436
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437 // Local definition for direct access to the private array:
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438 #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]
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439
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440 static Klass* box_klass(BasicType t) {
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441 assert((uint)t < T_VOID+1, "range check");
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442 return check_klass(_box_klasses[t]);
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443 }
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444 static BasicType box_klass_type(Klass* k); // inverse of box_klass
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445
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446 // methods returning lazily loaded klasses
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447 // The corresponding method to load the class must be called before calling them.
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448 static Klass* abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); }
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449
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450 static void load_abstract_ownable_synchronizer_klass(TRAPS);
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451
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452 private:
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453 // Tells whether ClassLoader.loadClassInternal is present
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454 static bool has_loadClassInternal() { return _has_loadClassInternal; }
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455
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456 // Returns the class loader data to be used when looking up/updating the
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457 // system dictionary.
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458 static ClassLoaderData *class_loader_data(Handle class_loader) {
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459 return ClassLoaderData::class_loader_data(class_loader());
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460 }
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461
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462 public:
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463 // Tells whether ClassLoader.checkPackageAccess is present
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464 static bool has_checkPackageAccess() { return _has_checkPackageAccess; }
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465
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466 static bool Class_klass_loaded() { return WK_KLASS(Class_klass) != NULL; }
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467 static bool Cloneable_klass_loaded() { return WK_KLASS(Cloneable_klass) != NULL; }
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468 static bool Object_klass_loaded() { return WK_KLASS(Object_klass) != NULL; }
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469 static bool ClassLoader_klass_loaded() { return WK_KLASS(ClassLoader_klass) != NULL; }
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470
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471 // Returns default system loader
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472 static oop java_system_loader();
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473
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474 // Compute the default system loader
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475 static void compute_java_system_loader(TRAPS);
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476
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477 // Register a new class loader
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478 static ClassLoaderData* register_loader(Handle class_loader);
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479 private:
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480 // Mirrors for primitive classes (created eagerly)
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481 static oop check_mirror(oop m) {
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482 assert(m != NULL, "mirror not initialized");
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483 return m;
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484 }
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485
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486 public:
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487 // Note: java_lang_Class::primitive_type is the inverse of java_mirror
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488
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489 // Check class loader constraints
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490 static bool add_loader_constraint(Symbol* name, Handle loader1,
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491 Handle loader2, TRAPS);
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492 static char* check_signature_loaders(Symbol* signature, Handle loader1,
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493 Handle loader2, bool is_method, TRAPS);
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494
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495 // JSR 292
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496 // find a java.lang.invoke.MethodHandle.invoke* method for a given signature
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497 // (asks Java to compute it if necessary, except in a compiler thread)
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498 static methodHandle find_method_handle_invoker(Symbol* name,
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499 Symbol* signature,
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500 KlassHandle accessing_klass,
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501 Handle *appendix_result,
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502 Handle *method_type_result,
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503 TRAPS);
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504 // for a given signature, find the internal MethodHandle method (linkTo* or invokeBasic)
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505 // (does not ask Java, since this is a low-level intrinsic defined by the JVM)
1d7922586cf6 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 6197
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506 static methodHandle find_method_handle_intrinsic(vmIntrinsics::ID iid,
1d7922586cf6 7023639: JSR 292 method handle invocation needs a fast path for compiled code
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parents: 6197
diff changeset
507 Symbol* signature,
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twisti
parents: 6197
diff changeset
508 TRAPS);
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twisti
parents: 6197
diff changeset
509 // find a java.lang.invoke.MethodType object for a given signature
1d7922586cf6 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 6197
diff changeset
510 // (asks Java to compute it if necessary, except in a compiler thread)
2177
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coleenp
parents: 2129
diff changeset
511 static Handle find_method_handle_type(Symbol* signature,
1508
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jrose
parents: 1507
diff changeset
512 KlassHandle accessing_klass,
1507
cd5dbf694d45 6939134: JSR 292 adjustments to method handle invocation
jrose
parents: 1152
diff changeset
513 TRAPS);
6266
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parents: 6197
diff changeset
514
2357
8033953d67ff 7012648: move JSR 292 to package java.lang.invoke and adjust names
jrose
parents: 2356
diff changeset
515 // ask Java to compute a java.lang.invoke.MethodHandle object for a given CP entry
1602
136b78722a08 6939203: JSR 292 needs method handle constants
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diff changeset
516 static Handle link_method_handle_constant(KlassHandle caller,
136b78722a08 6939203: JSR 292 needs method handle constants
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517 int ref_kind, //e.g., JVM_REF_invokeVirtual
136b78722a08 6939203: JSR 292 needs method handle constants
jrose
parents: 1552
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518 KlassHandle callee,
2177
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coleenp
parents: 2129
diff changeset
519 Symbol* name,
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coleenp
parents: 2129
diff changeset
520 Symbol* signature,
1602
136b78722a08 6939203: JSR 292 needs method handle constants
jrose
parents: 1552
diff changeset
521 TRAPS);
6266
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twisti
parents: 6197
diff changeset
522
726
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jrose
parents: 710
diff changeset
523 // ask Java to create a dynamic call site, while linking an invokedynamic op
6266
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parents: 6197
diff changeset
524 static methodHandle find_dynamic_call_site_invoker(KlassHandle caller,
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parents: 6197
diff changeset
525 Handle bootstrap_method,
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twisti
parents: 6197
diff changeset
526 Symbol* name,
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twisti
parents: 6197
diff changeset
527 Symbol* type,
1d7922586cf6 7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents: 6197
diff changeset
528 Handle *appendix_result,
6822
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twisti
parents: 6725
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529 Handle *method_type_result,
6266
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twisti
parents: 6197
diff changeset
530 TRAPS);
726
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jrose
parents: 710
diff changeset
531
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532 // Utility for printing loader "name" as part of tracing constraints
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533 static const char* loader_name(oop loader) {
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534 return ((loader) == NULL ? "<bootloader>" :
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diff changeset
535 InstanceKlass::cast((loader)->klass())->name()->as_C_string() );
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coleenp
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diff changeset
536 }
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537 static const char* loader_name(ClassLoaderData* loader_data) {
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coleenp
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diff changeset
538 return (loader_data->is_the_null_class_loader_data() ? "<bootloader>" :
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diff changeset
539 InstanceKlass::cast((loader_data->class_loader())->klass())->name()->as_C_string() );
0
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540 }
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541
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542 // Record the error when the first attempt to resolve a reference from a constant
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543 // pool entry to a class fails.
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544 static void add_resolution_error(constantPoolHandle pool, int which, Symbol* error);
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545 static void delete_resolution_error(ConstantPool* pool);
2177
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546 static Symbol* find_resolution_error(constantPoolHandle pool, int which);
0
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547
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548 private:
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549
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550 enum Constants {
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551 _loader_constraint_size = 107, // number of entries in constraint table
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552 _resolution_error_size = 107, // number of entries in resolution error table
710
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parents: 665
diff changeset
553 _invoke_method_size = 139, // number of entries in invoke method table
4864
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parents: 3938
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554 _nof_buckets = 1009, // number of buckets in hash table for placeholders
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555 _old_default_sdsize = 1009, // backward compat for system dictionary size
b2cd0ee8f778 7114376: Make system dictionary hashtable bucket array size configurable
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diff changeset
556 _prime_array_size = 8, // array of primes for system dictionary size
b2cd0ee8f778 7114376: Make system dictionary hashtable bucket array size configurable
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diff changeset
557 _average_depth_goal = 3 // goal for lookup length
0
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558 };
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559
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560
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561 // Static variables
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562
4864
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acorn
parents: 3938
diff changeset
563 // hashtable sizes for system dictionary to allow growth
b2cd0ee8f778 7114376: Make system dictionary hashtable bucket array size configurable
acorn
parents: 3938
diff changeset
564 // prime numbers for system dictionary size
b2cd0ee8f778 7114376: Make system dictionary hashtable bucket array size configurable
acorn
parents: 3938
diff changeset
565 static int _sdgeneration;
b2cd0ee8f778 7114376: Make system dictionary hashtable bucket array size configurable
acorn
parents: 3938
diff changeset
566 static const int _primelist[_prime_array_size];
b2cd0ee8f778 7114376: Make system dictionary hashtable bucket array size configurable
acorn
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diff changeset
567
0
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568 // Hashtable holding loaded classes.
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569 static Dictionary* _dictionary;
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570
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parents:
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571 // Hashtable holding placeholders for classes being loaded.
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572 static PlaceholderTable* _placeholders;
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573
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parents:
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574 // Hashtable holding classes from the shared archive.
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575 static Dictionary* _shared_dictionary;
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parents:
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576
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577 // Monotonically increasing counter which grows with
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parents:
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578 // _number_of_classes as well as hot-swapping and breakpoint setting
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parents:
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579 // and removal.
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parents:
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580 static int _number_of_modifications;
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parents:
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581
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parents:
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582 // Lock object for system class loader
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583 static oop _system_loader_lock_obj;
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584
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parents:
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585 // Constraints on class loaders
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586 static LoaderConstraintTable* _loader_constraints;
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587
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588 // Resolution errors
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589 static ResolutionErrorTable* _resolution_errors;
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590
710
e5b0439ef4ae 6655638: dynamic languages need method handles
jrose
parents: 665
diff changeset
591 // Invoke methods (JSR 292)
e5b0439ef4ae 6655638: dynamic languages need method handles
jrose
parents: 665
diff changeset
592 static SymbolPropertyTable* _invoke_method_table;
e5b0439ef4ae 6655638: dynamic languages need method handles
jrose
parents: 665
diff changeset
593
0
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594 public:
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595 // for VM_CounterDecay iteration support
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596 friend class CounterDecay;
6725
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coleenp
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597 static Klass* try_get_next_class();
0
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598
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599 private:
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600 static void validate_protection_domain(instanceKlassHandle klass,
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601 Handle class_loader,
a61af66fc99e Initial load
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602 Handle protection_domain, TRAPS);
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603
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604 friend class VM_PopulateDumpSharedSpace;
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605 friend class TraversePlaceholdersClosure;
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606 static Dictionary* dictionary() { return _dictionary; }
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607 static Dictionary* shared_dictionary() { return _shared_dictionary; }
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608 static PlaceholderTable* placeholders() { return _placeholders; }
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609 static LoaderConstraintTable* constraints() { return _loader_constraints; }
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610 static ResolutionErrorTable* resolution_errors() { return _resolution_errors; }
710
e5b0439ef4ae 6655638: dynamic languages need method handles
jrose
parents: 665
diff changeset
611 static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; }
0
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parents:
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612
a61af66fc99e Initial load
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parents:
diff changeset
613 // Basic loading operations
6725
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6266
diff changeset
614 static Klass* resolve_instance_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6266
diff changeset
615 static Klass* resolve_array_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 2129
diff changeset
616 static instanceKlassHandle handle_parallel_super_load(Symbol* class_name, Symbol* supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS);
0
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diff changeset
617 // Wait on SystemDictionary_lock; unlocks lockObject before
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parents:
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618 // waiting; relocks lockObject with correct recursion count
a61af66fc99e Initial load
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parents:
diff changeset
619 // after waiting, but before reentering SystemDictionary_lock
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parents:
diff changeset
620 // to preserve lock order semantics.
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parents:
diff changeset
621 static void double_lock_wait(Handle lockObject, TRAPS);
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622 static void define_instance_class(instanceKlassHandle k, TRAPS);
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 2129
diff changeset
623 static instanceKlassHandle find_or_define_instance_class(Symbol* class_name,
0
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parents:
diff changeset
624 Handle class_loader,
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parents:
diff changeset
625 instanceKlassHandle k, TRAPS);
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 2129
diff changeset
626 static instanceKlassHandle load_shared_class(Symbol* class_name,
0
a61af66fc99e Initial load
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diff changeset
627 Handle class_loader, TRAPS);
a61af66fc99e Initial load
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parents:
diff changeset
628 static instanceKlassHandle load_shared_class(instanceKlassHandle ik,
a61af66fc99e Initial load
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parents:
diff changeset
629 Handle class_loader, TRAPS);
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 2129
diff changeset
630 static instanceKlassHandle load_instance_class(Symbol* class_name, Handle class_loader, TRAPS);
0
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parents:
diff changeset
631 static Handle compute_loader_lock_object(Handle class_loader, TRAPS);
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diff changeset
632 static void check_loader_lock_contention(Handle loader_lock, TRAPS);
514
c81d2ef51ca3 4670071: loadClassInternal is too restrictive.
acorn
parents: 431
diff changeset
633 static bool is_parallelCapable(Handle class_loader);
1075
a75edfd400ea 6893504: LinkageError for bootstrap duplicate class definitions.
acorn
parents: 973
diff changeset
634 static bool is_parallelDefine(Handle class_loader);
0
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parents:
diff changeset
635
6725
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coleenp
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diff changeset
636 static Klass* find_shared_class(Symbol* class_name);
0
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diff changeset
637
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parents:
diff changeset
638 // Setup link to hierarchy
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diff changeset
639 static void add_to_hierarchy(instanceKlassHandle k, TRAPS);
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diff changeset
640
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641 private:
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parents:
diff changeset
642 // We pass in the hashtable index so we can calculate it outside of
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parents:
diff changeset
643 // the SystemDictionary_lock.
a61af66fc99e Initial load
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parents:
diff changeset
644
a61af66fc99e Initial load
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parents:
diff changeset
645 // Basic find on loaded classes
6725
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6266
diff changeset
646 static Klass* find_class(int index, unsigned int hash,
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6266
diff changeset
647 Symbol* name, ClassLoaderData* loader_data);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6266
diff changeset
648 static Klass* find_class(Symbol* class_name, ClassLoaderData* loader_data);
0
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diff changeset
649
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parents:
diff changeset
650 // Basic find on classes in the midst of being loaded
6725
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6266
diff changeset
651 static Symbol* find_placeholder(Symbol* name, ClassLoaderData* loader_data);
0
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diff changeset
652
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653 // Updating entry in dictionary
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parents:
diff changeset
654 // Add a completely loaded class
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 2129
diff changeset
655 static void add_klass(int index, Symbol* class_name,
6725
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6266
diff changeset
656 ClassLoaderData* loader_data, KlassHandle obj);
0
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diff changeset
657
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parents:
diff changeset
658 // Add a placeholder for a class being loaded
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diff changeset
659 static void add_placeholder(int index,
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 2129
diff changeset
660 Symbol* class_name,
6725
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6266
diff changeset
661 ClassLoaderData* loader_data);
0
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diff changeset
662 static void remove_placeholder(int index,
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 2129
diff changeset
663 Symbol* class_name,
6725
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6266
diff changeset
664 ClassLoaderData* loader_data);
0
a61af66fc99e Initial load
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parents:
diff changeset
665
a61af66fc99e Initial load
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diff changeset
666 // Performs cleanups after resolve_super_or_fail. This typically needs
a61af66fc99e Initial load
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parents:
diff changeset
667 // to be called on failure.
a61af66fc99e Initial load
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parents:
diff changeset
668 // Won't throw, but can block.
2177
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents: 2129
diff changeset
669 static void resolution_cleanups(Symbol* class_name,
6725
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6266
diff changeset
670 ClassLoaderData* loader_data,
0
a61af66fc99e Initial load
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parents:
diff changeset
671 TRAPS);
a61af66fc99e Initial load
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parents:
diff changeset
672
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parents:
diff changeset
673 // Initialization
a61af66fc99e Initial load
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parents:
diff changeset
674 static void initialize_preloaded_classes(TRAPS);
a61af66fc99e Initial load
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parents:
diff changeset
675
a61af66fc99e Initial load
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parents:
diff changeset
676 // Class loader constraints
a61af66fc99e Initial load
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parents:
diff changeset
677 static void check_constraints(int index, unsigned int hash,
a61af66fc99e Initial load
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parents:
diff changeset
678 instanceKlassHandle k, Handle loader,
a61af66fc99e Initial load
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parents:
diff changeset
679 bool defining, TRAPS);
a61af66fc99e Initial load
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parents:
diff changeset
680 static void update_dictionary(int d_index, unsigned int d_hash,
a61af66fc99e Initial load
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parents:
diff changeset
681 int p_index, unsigned int p_hash,
6725
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6266
diff changeset
682 instanceKlassHandle k, Handle loader,
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6266
diff changeset
683 TRAPS);
0
a61af66fc99e Initial load
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parents:
diff changeset
684
a61af66fc99e Initial load
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parents:
diff changeset
685 // Variables holding commonly used klasses (preloaded)
6725
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6266
diff changeset
686 static Klass* _well_known_klasses[];
0
a61af66fc99e Initial load
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parents:
diff changeset
687
a61af66fc99e Initial load
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parents:
diff changeset
688 // Lazily loaded klasses
6725
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 6266
diff changeset
689 static Klass* volatile _abstract_ownable_synchronizer_klass;
0
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690
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691 // table of box klasses (int_klass, etc.)
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692 static Klass* _box_klasses[T_VOID+1];
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693
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694 static oop _java_system_loader;
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695
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696 static bool _has_loadClassInternal;
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697 static bool _has_checkPackageAccess;
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698 };
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699
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700 #endif // SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP