Mercurial > hg > truffle
annotate src/share/vm/classfile/systemDictionary.hpp @ 665:c89f86385056
6814659: separable cleanups and subroutines for 6655638
Summary: preparatory but separable changes for method handles
Reviewed-by: kvn, never
author | jrose |
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date | Fri, 20 Mar 2009 23:19:36 -0700 |
parents | 0fbdb4381b99 |
children | e5b0439ef4ae |
rev | line source |
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0 | 1 /* |
579 | 2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 // The system dictionary stores all loaded classes and maps: | |
26 // | |
27 // [class name,class loader] -> class i.e. [symbolOop,oop] -> klassOop | |
28 // | |
29 // Classes are loaded lazily. The default VM class loader is | |
30 // represented as NULL. | |
31 | |
32 // The underlying data structure is an open hash table with a fixed number | |
33 // of buckets. During loading the loader object is locked, (for the VM loader | |
34 // a private lock object is used). Class loading can thus be done concurrently, | |
35 // but only by different loaders. | |
36 // | |
37 // During loading a placeholder (name, loader) is temporarily placed in | |
38 // a side data structure, and is used to detect ClassCircularityErrors | |
39 // and to perform verification during GC. A GC can occur in the midst | |
40 // of class loading, as we call out to Java, have to take locks, etc. | |
41 // | |
42 // When class loading is finished, a new entry is added to the system | |
43 // dictionary and the place holder is removed. Note that the protection | |
44 // domain field of the system dictionary has not yet been filled in when | |
45 // the "real" system dictionary entry is created. | |
46 // | |
47 // Clients of this class who are interested in finding if a class has | |
48 // been completely loaded -- not classes in the process of being loaded -- | |
49 // can read the SystemDictionary unlocked. This is safe because | |
50 // - entries are only deleted at safepoints | |
51 // - readers cannot come to a safepoint while actively examining | |
52 // an entry (an entry cannot be deleted from under a reader) | |
53 // - entries must be fully formed before they are available to concurrent | |
54 // readers (we must ensure write ordering) | |
55 // | |
56 // Note that placeholders are deleted at any time, as they are removed | |
57 // when a class is completely loaded. Therefore, readers as well as writers | |
58 // of placeholders must hold the SystemDictionary_lock. | |
59 // | |
60 | |
61 class Dictionary; | |
62 class PlaceholderTable; | |
63 class LoaderConstraintTable; | |
64 class HashtableBucket; | |
65 class ResolutionErrorTable; | |
66 | |
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67 // Certain classes are preloaded, such as java.lang.Object and java.lang.String. |
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68 // They are all "well-known", in the sense that no class loader is allowed |
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69 // to provide a different definition. |
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70 // |
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71 // These klasses must all have names defined in vmSymbols. |
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72 |
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73 #define WK_KLASS_ENUM_NAME(kname) kname##_knum |
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74 |
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75 // Each well-known class has a short klass name (like object_klass), |
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76 // a vmSymbol name (like java_lang_Object), and a flag word |
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77 // that makes some minor distinctions, like whether the klass |
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78 // is preloaded, optional, release-specific, etc. |
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79 // The order of these definitions is significant; it is the order in which |
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80 // preloading is actually performed by initialize_preloaded_classes. |
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81 |
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82 #define WK_KLASSES_DO(template) \ |
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83 /* well-known classes */ \ |
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84 template(object_klass, java_lang_Object, Pre) \ |
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85 template(string_klass, java_lang_String, Pre) \ |
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86 template(class_klass, java_lang_Class, Pre) \ |
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87 template(cloneable_klass, java_lang_Cloneable, Pre) \ |
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88 template(classloader_klass, java_lang_ClassLoader, Pre) \ |
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89 template(serializable_klass, java_io_Serializable, Pre) \ |
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90 template(system_klass, java_lang_System, Pre) \ |
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91 template(throwable_klass, java_lang_Throwable, Pre) \ |
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92 template(error_klass, java_lang_Error, Pre) \ |
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93 template(threaddeath_klass, java_lang_ThreadDeath, Pre) \ |
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94 template(exception_klass, java_lang_Exception, Pre) \ |
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95 template(runtime_exception_klass, java_lang_RuntimeException, Pre) \ |
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96 template(protectionDomain_klass, java_security_ProtectionDomain, Pre) \ |
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97 template(AccessControlContext_klass, java_security_AccessControlContext, Pre) \ |
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98 template(classNotFoundException_klass, java_lang_ClassNotFoundException, Pre) \ |
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99 template(noClassDefFoundError_klass, java_lang_NoClassDefFoundError, Pre) \ |
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100 template(linkageError_klass, java_lang_LinkageError, Pre) \ |
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101 template(ClassCastException_klass, java_lang_ClassCastException, Pre) \ |
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102 template(ArrayStoreException_klass, java_lang_ArrayStoreException, Pre) \ |
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103 template(virtualMachineError_klass, java_lang_VirtualMachineError, Pre) \ |
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104 template(OutOfMemoryError_klass, java_lang_OutOfMemoryError, Pre) \ |
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105 template(StackOverflowError_klass, java_lang_StackOverflowError, Pre) \ |
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106 template(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre) \ |
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107 template(reference_klass, java_lang_ref_Reference, Pre) \ |
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108 \ |
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109 /* Preload ref klasses and set reference types */ \ |
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110 template(soft_reference_klass, java_lang_ref_SoftReference, Pre) \ |
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111 template(weak_reference_klass, java_lang_ref_WeakReference, Pre) \ |
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112 template(final_reference_klass, java_lang_ref_FinalReference, Pre) \ |
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113 template(phantom_reference_klass, java_lang_ref_PhantomReference, Pre) \ |
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114 template(finalizer_klass, java_lang_ref_Finalizer, Pre) \ |
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115 \ |
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116 template(thread_klass, java_lang_Thread, Pre) \ |
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117 template(threadGroup_klass, java_lang_ThreadGroup, Pre) \ |
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118 template(properties_klass, java_util_Properties, Pre) \ |
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119 template(reflect_accessible_object_klass, java_lang_reflect_AccessibleObject, Pre) \ |
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120 template(reflect_field_klass, java_lang_reflect_Field, Pre) \ |
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121 template(reflect_method_klass, java_lang_reflect_Method, Pre) \ |
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122 template(reflect_constructor_klass, java_lang_reflect_Constructor, Pre) \ |
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123 \ |
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124 /* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \ |
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125 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \ |
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126 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \ |
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127 template(reflect_magic_klass, sun_reflect_MagicAccessorImpl, Opt) \ |
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128 template(reflect_method_accessor_klass, sun_reflect_MethodAccessorImpl, Opt_Only_JDK14NewRef) \ |
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129 template(reflect_constructor_accessor_klass, sun_reflect_ConstructorAccessorImpl, Opt_Only_JDK14NewRef) \ |
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130 template(reflect_delegating_classloader_klass, sun_reflect_DelegatingClassLoader, Opt) \ |
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131 template(reflect_constant_pool_klass, sun_reflect_ConstantPool, Opt_Only_JDK15) \ |
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132 template(reflect_unsafe_static_field_accessor_impl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15) \ |
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133 \ |
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134 template(vector_klass, java_util_Vector, Pre) \ |
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135 template(hashtable_klass, java_util_Hashtable, Pre) \ |
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136 template(stringBuffer_klass, java_lang_StringBuffer, Pre) \ |
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137 \ |
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138 /* It's NULL in non-1.4 JDKs. */ \ |
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139 template(stackTraceElement_klass, java_lang_StackTraceElement, Opt) \ |
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140 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \ |
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141 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \ |
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142 template(java_nio_Buffer_klass, java_nio_Buffer, Opt) \ |
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143 \ |
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144 /* If this class isn't present, it won't be referenced. */ \ |
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145 template(sun_misc_AtomicLongCSImpl_klass, sun_misc_AtomicLongCSImpl, Opt) \ |
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146 \ |
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147 template(sun_jkernel_DownloadManager_klass, sun_jkernel_DownloadManager, Opt_Kernel) \ |
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148 \ |
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149 /* Preload boxing klasses */ \ |
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150 template(boolean_klass, java_lang_Boolean, Pre) \ |
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151 template(char_klass, java_lang_Character, Pre) \ |
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152 template(float_klass, java_lang_Float, Pre) \ |
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153 template(double_klass, java_lang_Double, Pre) \ |
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154 template(byte_klass, java_lang_Byte, Pre) \ |
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155 template(short_klass, java_lang_Short, Pre) \ |
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156 template(int_klass, java_lang_Integer, Pre) \ |
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157 template(long_klass, java_lang_Long, Pre) \ |
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158 /*end*/ |
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159 |
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160 |
0 | 161 class SystemDictionary : AllStatic { |
162 friend class VMStructs; | |
163 friend class CompactingPermGenGen; | |
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164 friend class SystemDictionaryHandles; |
0 | 165 NOT_PRODUCT(friend class instanceKlassKlass;) |
166 | |
167 public: | |
132
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168 enum WKID { |
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169 NO_WKID = 0, |
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170 |
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171 #define WK_KLASS_ENUM(name, ignore_s, ignore_o) WK_KLASS_ENUM_NAME(name), |
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172 WK_KLASSES_DO(WK_KLASS_ENUM) |
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173 #undef WK_KLASS_ENUM |
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174 |
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175 WKID_LIMIT, |
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176 |
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177 FIRST_WKID = NO_WKID + 1 |
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178 }; |
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179 |
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180 enum InitOption { |
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181 Pre, // preloaded; error if not present |
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182 |
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183 // Order is significant. Options before this point require resolve_or_fail. |
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184 // Options after this point will use resolve_or_null instead. |
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185 |
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186 Opt, // preload tried; NULL if not present |
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187 Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection |
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188 Opt_Only_JDK15, // preload tried; use only with JDK1.5+ |
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189 Opt_Kernel, // preload tried only #ifdef KERNEL |
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190 OPTION_LIMIT, |
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191 CEIL_LG_OPTION_LIMIT = 4 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT) |
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192 }; |
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193 |
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194 |
0 | 195 // Returns a class with a given class name and class loader. Loads the |
196 // class if needed. If not found a NoClassDefFoundError or a | |
197 // ClassNotFoundException is thrown, depending on the value on the | |
198 // throw_error flag. For most uses the throw_error argument should be set | |
199 // to true. | |
200 | |
201 static klassOop resolve_or_fail(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS); | |
202 // Convenient call for null loader and protection domain. | |
203 static klassOop resolve_or_fail(symbolHandle class_name, bool throw_error, TRAPS); | |
204 private: | |
205 // handle error translation for resolve_or_null results | |
206 static klassOop handle_resolution_exception(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS); | |
207 | |
208 public: | |
209 | |
210 // Returns a class with a given class name and class loader. | |
211 // Loads the class if needed. If not found NULL is returned. | |
212 static klassOop resolve_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS); | |
213 // Version with null loader and protection domain | |
214 static klassOop resolve_or_null(symbolHandle class_name, TRAPS); | |
215 | |
216 // Resolve a superclass or superinterface. Called from ClassFileParser, | |
217 // parse_interfaces, resolve_instance_class_or_null, load_shared_class | |
218 // "child_name" is the class whose super class or interface is being resolved. | |
219 static klassOop resolve_super_or_fail(symbolHandle child_name, | |
220 symbolHandle class_name, | |
221 Handle class_loader, | |
222 Handle protection_domain, | |
223 bool is_superclass, | |
224 TRAPS); | |
225 | |
226 // Parse new stream. This won't update the system dictionary or | |
227 // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses. | |
228 static klassOop parse_stream(symbolHandle class_name, | |
229 Handle class_loader, | |
230 Handle protection_domain, | |
231 ClassFileStream* st, | |
431
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232 TRAPS) { |
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233 KlassHandle nullHandle; |
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234 return parse_stream(class_name, class_loader, protection_domain, st, nullHandle, NULL, THREAD); |
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235 } |
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236 static klassOop parse_stream(symbolHandle class_name, |
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237 Handle class_loader, |
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238 Handle protection_domain, |
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239 ClassFileStream* st, |
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240 KlassHandle host_klass, |
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241 GrowableArray<Handle>* cp_patches, |
0 | 242 TRAPS); |
243 | |
244 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass) | |
245 static klassOop resolve_from_stream(symbolHandle class_name, Handle class_loader, Handle protection_domain, ClassFileStream* st, TRAPS); | |
246 | |
247 // Lookup an already loaded class. If not found NULL is returned. | |
248 static klassOop find(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS); | |
249 | |
250 // Lookup an already loaded instance or array class. | |
251 // Do not make any queries to class loaders; consult only the cache. | |
252 // If not found NULL is returned. | |
253 static klassOop find_instance_or_array_klass(symbolHandle class_name, | |
254 Handle class_loader, | |
255 Handle protection_domain, | |
256 TRAPS); | |
257 | |
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258 // If the given name is known to vmSymbols, return the well-know klass: |
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259 static klassOop find_well_known_klass(symbolOop class_name); |
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260 |
0 | 261 // Lookup an instance or array class that has already been loaded |
262 // either into the given class loader, or else into another class | |
263 // loader that is constrained (via loader constraints) to produce | |
264 // a consistent class. Do not take protection domains into account. | |
265 // Do not make any queries to class loaders; consult only the cache. | |
266 // Return NULL if the class is not found. | |
267 // | |
268 // This function is a strict superset of find_instance_or_array_klass. | |
269 // This function (the unchecked version) makes a conservative prediction | |
270 // of the result of the checked version, assuming successful lookup. | |
271 // If both functions return non-null, they must return the same value. | |
272 // Also, the unchecked version may sometimes be non-null where the | |
273 // checked version is null. This can occur in several ways: | |
274 // 1. No query has yet been made to the class loader. | |
275 // 2. The class loader was queried, but chose not to delegate. | |
276 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain. | |
277 // 4. Loading was attempted, but there was a linkage error of some sort. | |
278 // In all of these cases, the loader constraints on this type are | |
279 // satisfied, and it is safe for classes in the given class loader | |
280 // to manipulate strongly-typed values of the found class, subject | |
281 // to local linkage and access checks. | |
282 static klassOop find_constrained_instance_or_array_klass(symbolHandle class_name, | |
283 Handle class_loader, | |
284 TRAPS); | |
285 | |
286 // Iterate over all klasses in dictionary | |
287 // Just the classes from defining class loaders | |
288 static void classes_do(void f(klassOop)); | |
289 // Added for initialize_itable_for_klass to handle exceptions | |
290 static void classes_do(void f(klassOop, TRAPS), TRAPS); | |
291 // All classes, and their class loaders | |
292 static void classes_do(void f(klassOop, oop)); | |
293 // All classes, and their class loaders | |
294 // (added for helpers that use HandleMarks and ResourceMarks) | |
295 static void classes_do(void f(klassOop, oop, TRAPS), TRAPS); | |
296 // All entries in the placeholder table and their class loaders | |
297 static void placeholders_do(void f(symbolOop, oop)); | |
298 | |
299 // Iterate over all methods in all klasses in dictionary | |
300 static void methods_do(void f(methodOop)); | |
301 | |
302 // Garbage collection support | |
303 | |
304 // This method applies "blk->do_oop" to all the pointers to "system" | |
305 // classes and loaders. | |
306 static void always_strong_oops_do(OopClosure* blk); | |
307 static void always_strong_classes_do(OopClosure* blk); | |
308 // This method applies "blk->do_oop" to all the placeholders. | |
309 static void placeholders_do(OopClosure* blk); | |
310 | |
311 // Unload (that is, break root links to) all unmarked classes and | |
312 // loaders. Returns "true" iff something was unloaded. | |
313 static bool do_unloading(BoolObjectClosure* is_alive); | |
314 | |
315 // Applies "f->do_oop" to all root oops in the system dictionary. | |
316 static void oops_do(OopClosure* f); | |
317 | |
318 // System loader lock | |
319 static oop system_loader_lock() { return _system_loader_lock_obj; } | |
320 | |
321 private: | |
322 // Traverses preloaded oops: various system classes. These are | |
323 // guaranteed to be in the perm gen. | |
324 static void preloaded_oops_do(OopClosure* f); | |
325 static void lazily_loaded_oops_do(OopClosure* f); | |
326 | |
327 public: | |
328 // Sharing support. | |
329 static void reorder_dictionary(); | |
330 static void copy_buckets(char** top, char* end); | |
331 static void copy_table(char** top, char* end); | |
332 static void reverse(); | |
333 static void set_shared_dictionary(HashtableBucket* t, int length, | |
334 int number_of_entries); | |
335 // Printing | |
336 static void print() PRODUCT_RETURN; | |
337 static void print_class_statistics() PRODUCT_RETURN; | |
338 static void print_method_statistics() PRODUCT_RETURN; | |
339 | |
340 // Number of contained klasses | |
341 // This is both fully loaded classes and classes in the process | |
342 // of being loaded | |
343 static int number_of_classes(); | |
344 | |
345 // Monotonically increasing counter which grows as classes are | |
346 // loaded or modifications such as hot-swapping or setting/removing | |
347 // of breakpoints are performed | |
348 static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; } | |
349 // Needed by evolution and breakpoint code | |
350 static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; } | |
351 | |
352 // Verification | |
353 static void verify(); | |
354 | |
355 #ifdef ASSERT | |
356 static bool is_internal_format(symbolHandle class_name); | |
357 #endif | |
358 | |
359 // Verify class is in dictionary | |
360 static void verify_obj_klass_present(Handle obj, | |
361 symbolHandle class_name, | |
362 Handle class_loader); | |
363 | |
364 // Initialization | |
365 static void initialize(TRAPS); | |
366 | |
367 // Fast access to commonly used classes (preloaded) | |
368 static klassOop check_klass(klassOop k) { | |
369 assert(k != NULL, "preloaded klass not initialized"); | |
370 return k; | |
371 } | |
372 | |
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373 static klassOop check_klass_Pre(klassOop k) { return check_klass(k); } |
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374 static klassOop check_klass_Opt(klassOop k) { return k; } |
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375 static klassOop check_klass_Opt_Kernel(klassOop k) { return k; } //== Opt |
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376 static klassOop check_klass_Opt_Only_JDK15(klassOop k) { |
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377 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only"); |
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378 return k; |
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379 } |
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380 static klassOop check_klass_Opt_Only_JDK14NewRef(klassOop k) { |
0 | 381 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only"); |
132
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382 // despite the optional loading, if you use this it must be present: |
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383 return check_klass(k); |
0 | 384 } |
385 | |
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386 static bool initialize_wk_klass(WKID id, int init_opt, TRAPS); |
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387 static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS); |
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388 static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) { |
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389 int limit = (int)end_id + 1; |
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390 initialize_wk_klasses_until((WKID) limit, start_id, THREAD); |
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391 } |
0 | 392 |
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393 public: |
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394 #define WK_KLASS_DECLARE(name, ignore_symbol, option) \ |
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395 static klassOop name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } |
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396 WK_KLASSES_DO(WK_KLASS_DECLARE); |
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397 #undef WK_KLASS_DECLARE |
0 | 398 |
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399 // Local definition for direct access to the private array: |
147 | 400 #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)] |
0 | 401 |
402 static klassOop box_klass(BasicType t) { | |
403 assert((uint)t < T_VOID+1, "range check"); | |
404 return check_klass(_box_klasses[t]); | |
405 } | |
406 static BasicType box_klass_type(klassOop k); // inverse of box_klass | |
407 | |
408 // methods returning lazily loaded klasses | |
409 // The corresponding method to load the class must be called before calling them. | |
410 static klassOop abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); } | |
411 | |
412 static void load_abstract_ownable_synchronizer_klass(TRAPS); | |
413 | |
414 private: | |
415 // Tells whether ClassLoader.loadClassInternal is present | |
416 static bool has_loadClassInternal() { return _has_loadClassInternal; } | |
417 | |
418 public: | |
419 // Tells whether ClassLoader.checkPackageAccess is present | |
420 static bool has_checkPackageAccess() { return _has_checkPackageAccess; } | |
421 | |
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422 static bool class_klass_loaded() { return WK_KLASS(class_klass) != NULL; } |
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423 static bool cloneable_klass_loaded() { return WK_KLASS(cloneable_klass) != NULL; } |
0 | 424 |
425 // Returns default system loader | |
426 static oop java_system_loader(); | |
427 | |
428 // Compute the default system loader | |
429 static void compute_java_system_loader(TRAPS); | |
430 | |
431 private: | |
432 // Mirrors for primitive classes (created eagerly) | |
433 static oop check_mirror(oop m) { | |
434 assert(m != NULL, "mirror not initialized"); | |
435 return m; | |
436 } | |
437 | |
438 public: | |
439 // Note: java_lang_Class::primitive_type is the inverse of java_mirror | |
440 | |
441 // Check class loader constraints | |
442 static bool add_loader_constraint(symbolHandle name, Handle loader1, | |
443 Handle loader2, TRAPS); | |
444 static char* check_signature_loaders(symbolHandle signature, Handle loader1, | |
445 Handle loader2, bool is_method, TRAPS); | |
446 | |
447 // Utility for printing loader "name" as part of tracing constraints | |
448 static const char* loader_name(oop loader) { | |
449 return ((loader) == NULL ? "<bootloader>" : | |
450 instanceKlass::cast((loader)->klass())->name()->as_C_string() ); | |
451 } | |
452 | |
453 // Record the error when the first attempt to resolve a reference from a constant | |
454 // pool entry to a class fails. | |
455 static void add_resolution_error(constantPoolHandle pool, int which, symbolHandle error); | |
456 static symbolOop find_resolution_error(constantPoolHandle pool, int which); | |
457 | |
458 private: | |
459 | |
460 enum Constants { | |
461 _loader_constraint_size = 107, // number of entries in constraint table | |
462 _resolution_error_size = 107, // number of entries in resolution error table | |
463 _nof_buckets = 1009 // number of buckets in hash table | |
464 }; | |
465 | |
466 | |
467 // Static variables | |
468 | |
469 // Hashtable holding loaded classes. | |
470 static Dictionary* _dictionary; | |
471 | |
472 // Hashtable holding placeholders for classes being loaded. | |
473 static PlaceholderTable* _placeholders; | |
474 | |
475 // Hashtable holding classes from the shared archive. | |
476 static Dictionary* _shared_dictionary; | |
477 | |
478 // Monotonically increasing counter which grows with | |
479 // _number_of_classes as well as hot-swapping and breakpoint setting | |
480 // and removal. | |
481 static int _number_of_modifications; | |
482 | |
483 // Lock object for system class loader | |
484 static oop _system_loader_lock_obj; | |
485 | |
486 // Constraints on class loaders | |
487 static LoaderConstraintTable* _loader_constraints; | |
488 | |
489 // Resolution errors | |
490 static ResolutionErrorTable* _resolution_errors; | |
491 | |
492 public: | |
493 // for VM_CounterDecay iteration support | |
494 friend class CounterDecay; | |
495 static klassOop try_get_next_class(); | |
496 | |
497 private: | |
498 static void validate_protection_domain(instanceKlassHandle klass, | |
499 Handle class_loader, | |
500 Handle protection_domain, TRAPS); | |
501 | |
502 friend class VM_PopulateDumpSharedSpace; | |
503 friend class TraversePlaceholdersClosure; | |
504 static Dictionary* dictionary() { return _dictionary; } | |
505 static Dictionary* shared_dictionary() { return _shared_dictionary; } | |
506 static PlaceholderTable* placeholders() { return _placeholders; } | |
507 static LoaderConstraintTable* constraints() { return _loader_constraints; } | |
508 static ResolutionErrorTable* resolution_errors() { return _resolution_errors; } | |
509 | |
510 // Basic loading operations | |
511 static klassOop resolve_instance_class_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS); | |
512 static klassOop resolve_array_class_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS); | |
513 static instanceKlassHandle handle_parallel_super_load(symbolHandle class_name, symbolHandle supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS); | |
514 // Wait on SystemDictionary_lock; unlocks lockObject before | |
515 // waiting; relocks lockObject with correct recursion count | |
516 // after waiting, but before reentering SystemDictionary_lock | |
517 // to preserve lock order semantics. | |
518 static void double_lock_wait(Handle lockObject, TRAPS); | |
519 static void define_instance_class(instanceKlassHandle k, TRAPS); | |
520 static instanceKlassHandle find_or_define_instance_class(symbolHandle class_name, | |
521 Handle class_loader, | |
522 instanceKlassHandle k, TRAPS); | |
523 static instanceKlassHandle load_shared_class(symbolHandle class_name, | |
524 Handle class_loader, TRAPS); | |
525 static instanceKlassHandle load_shared_class(instanceKlassHandle ik, | |
526 Handle class_loader, TRAPS); | |
527 static instanceKlassHandle load_instance_class(symbolHandle class_name, Handle class_loader, TRAPS); | |
528 static Handle compute_loader_lock_object(Handle class_loader, TRAPS); | |
529 static void check_loader_lock_contention(Handle loader_lock, TRAPS); | |
514 | 530 static bool is_parallelCapable(Handle class_loader); |
0 | 531 |
532 static klassOop find_shared_class(symbolHandle class_name); | |
533 | |
534 // Setup link to hierarchy | |
535 static void add_to_hierarchy(instanceKlassHandle k, TRAPS); | |
536 | |
537 private: | |
538 // We pass in the hashtable index so we can calculate it outside of | |
539 // the SystemDictionary_lock. | |
540 | |
541 // Basic find on loaded classes | |
542 static klassOop find_class(int index, unsigned int hash, | |
543 symbolHandle name, Handle loader); | |
544 | |
545 // Basic find on classes in the midst of being loaded | |
546 static symbolOop find_placeholder(int index, unsigned int hash, | |
547 symbolHandle name, Handle loader); | |
548 | |
549 // Basic find operation of loaded classes and classes in the midst | |
550 // of loading; used for assertions and verification only. | |
551 static oop find_class_or_placeholder(symbolHandle class_name, | |
552 Handle class_loader); | |
553 | |
554 // Updating entry in dictionary | |
555 // Add a completely loaded class | |
556 static void add_klass(int index, symbolHandle class_name, | |
557 Handle class_loader, KlassHandle obj); | |
558 | |
559 // Add a placeholder for a class being loaded | |
560 static void add_placeholder(int index, | |
561 symbolHandle class_name, | |
562 Handle class_loader); | |
563 static void remove_placeholder(int index, | |
564 symbolHandle class_name, | |
565 Handle class_loader); | |
566 | |
567 // Performs cleanups after resolve_super_or_fail. This typically needs | |
568 // to be called on failure. | |
569 // Won't throw, but can block. | |
570 static void resolution_cleanups(symbolHandle class_name, | |
571 Handle class_loader, | |
572 TRAPS); | |
573 | |
574 // Initialization | |
575 static void initialize_preloaded_classes(TRAPS); | |
576 | |
577 // Class loader constraints | |
578 static void check_constraints(int index, unsigned int hash, | |
579 instanceKlassHandle k, Handle loader, | |
580 bool defining, TRAPS); | |
581 static void update_dictionary(int d_index, unsigned int d_hash, | |
582 int p_index, unsigned int p_hash, | |
583 instanceKlassHandle k, Handle loader, TRAPS); | |
584 | |
585 // Variables holding commonly used klasses (preloaded) | |
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586 static klassOop _well_known_klasses[]; |
0 | 587 |
588 // Lazily loaded klasses | |
589 static volatile klassOop _abstract_ownable_synchronizer_klass; | |
590 | |
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591 // table of box klasses (int_klass, etc.) |
0 | 592 static klassOop _box_klasses[T_VOID+1]; |
593 | |
594 static oop _java_system_loader; | |
595 | |
596 static bool _has_loadClassInternal; | |
597 static bool _has_checkPackageAccess; | |
598 }; | |
665
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599 |
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600 // Cf. vmSymbols vs. vmSymbolHandles |
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601 class SystemDictionaryHandles : AllStatic { |
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602 public: |
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603 #define WK_KLASS_HANDLE_DECLARE(name, ignore_symbol, option) \ |
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604 static KlassHandle name() { \ |
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605 SystemDictionary::name(); \ |
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606 klassOop* loc = &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \ |
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607 return KlassHandle(loc, true); \ |
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608 } |
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609 WK_KLASSES_DO(WK_KLASS_HANDLE_DECLARE); |
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610 #undef WK_KLASS_HANDLE_DECLARE |
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611 |
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612 static KlassHandle box_klass(BasicType t); |
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613 }; |