Mercurial > hg > truffle
annotate src/share/vm/classfile/systemDictionary.hpp @ 3763:e66f38dd58a9
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date | Wed, 08 Jun 2011 08:39:53 -0700 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. 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 * | |
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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. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP |
26 #define SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP | |
27 | |
28 #include "classfile/classFileStream.hpp" | |
29 #include "classfile/classLoader.hpp" | |
30 #include "oops/objArrayOop.hpp" | |
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31 #include "oops/symbol.hpp" |
1972 | 32 #include "runtime/java.hpp" |
33 #include "runtime/reflectionUtils.hpp" | |
34 #include "utilities/hashtable.hpp" | |
35 | |
0 | 36 // The system dictionary stores all loaded classes and maps: |
37 // | |
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38 // [class name,class loader] -> class i.e. [Symbol*,oop] -> klassOop |
0 | 39 // |
40 // Classes are loaded lazily. The default VM class loader is | |
41 // represented as NULL. | |
42 | |
43 // The underlying data structure is an open hash table with a fixed number | |
44 // of buckets. During loading the loader object is locked, (for the VM loader | |
45 // a private lock object is used). Class loading can thus be done concurrently, | |
46 // but only by different loaders. | |
47 // | |
48 // During loading a placeholder (name, loader) is temporarily placed in | |
49 // a side data structure, and is used to detect ClassCircularityErrors | |
50 // and to perform verification during GC. A GC can occur in the midst | |
51 // of class loading, as we call out to Java, have to take locks, etc. | |
52 // | |
53 // When class loading is finished, a new entry is added to the system | |
54 // dictionary and the place holder is removed. Note that the protection | |
55 // domain field of the system dictionary has not yet been filled in when | |
56 // the "real" system dictionary entry is created. | |
57 // | |
58 // Clients of this class who are interested in finding if a class has | |
59 // been completely loaded -- not classes in the process of being loaded -- | |
60 // can read the SystemDictionary unlocked. This is safe because | |
61 // - entries are only deleted at safepoints | |
62 // - readers cannot come to a safepoint while actively examining | |
63 // an entry (an entry cannot be deleted from under a reader) | |
64 // - entries must be fully formed before they are available to concurrent | |
65 // readers (we must ensure write ordering) | |
66 // | |
67 // Note that placeholders are deleted at any time, as they are removed | |
68 // when a class is completely loaded. Therefore, readers as well as writers | |
69 // of placeholders must hold the SystemDictionary_lock. | |
70 // | |
71 | |
72 class Dictionary; | |
73 class PlaceholderTable; | |
74 class LoaderConstraintTable; | |
75 class HashtableBucket; | |
76 class ResolutionErrorTable; | |
710 | 77 class SymbolPropertyTable; |
0 | 78 |
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79 // Certain classes are preloaded, such as java.lang.Object and java.lang.String. |
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80 // They are all "well-known", in the sense that no class loader is allowed |
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81 // to provide a different definition. |
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82 // |
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83 // These klasses must all have names defined in vmSymbols. |
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84 |
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85 #define WK_KLASS_ENUM_NAME(kname) kname##_knum |
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86 |
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87 // Each well-known class has a short klass name (like object_klass), |
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88 // a vmSymbol name (like java_lang_Object), and a flag word |
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89 // that makes some minor distinctions, like whether the klass |
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90 // is preloaded, optional, release-specific, etc. |
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91 // The order of these definitions is significant; it is the order in which |
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92 // preloading is actually performed by initialize_preloaded_classes. |
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93 |
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94 #define WK_KLASSES_DO(template) \ |
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95 /* well-known classes */ \ |
1142 | 96 template(Object_klass, java_lang_Object, Pre) \ |
97 template(String_klass, java_lang_String, Pre) \ | |
98 template(Class_klass, java_lang_Class, Pre) \ | |
99 template(Cloneable_klass, java_lang_Cloneable, Pre) \ | |
100 template(ClassLoader_klass, java_lang_ClassLoader, Pre) \ | |
101 template(Serializable_klass, java_io_Serializable, Pre) \ | |
102 template(System_klass, java_lang_System, Pre) \ | |
103 template(Throwable_klass, java_lang_Throwable, Pre) \ | |
104 template(Error_klass, java_lang_Error, Pre) \ | |
105 template(ThreadDeath_klass, java_lang_ThreadDeath, Pre) \ | |
106 template(Exception_klass, java_lang_Exception, Pre) \ | |
107 template(RuntimeException_klass, java_lang_RuntimeException, Pre) \ | |
108 template(ProtectionDomain_klass, java_security_ProtectionDomain, Pre) \ | |
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109 template(AccessControlContext_klass, java_security_AccessControlContext, Pre) \ |
1142 | 110 template(ClassNotFoundException_klass, java_lang_ClassNotFoundException, Pre) \ |
111 template(NoClassDefFoundError_klass, java_lang_NoClassDefFoundError, Pre) \ | |
112 template(LinkageError_klass, java_lang_LinkageError, Pre) \ | |
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113 template(ClassCastException_klass, java_lang_ClassCastException, Pre) \ |
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114 template(ArrayStoreException_klass, java_lang_ArrayStoreException, Pre) \ |
1142 | 115 template(VirtualMachineError_klass, java_lang_VirtualMachineError, Pre) \ |
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116 template(OutOfMemoryError_klass, java_lang_OutOfMemoryError, Pre) \ |
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117 template(StackOverflowError_klass, java_lang_StackOverflowError, Pre) \ |
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118 template(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre) \ |
1142 | 119 template(Reference_klass, java_lang_ref_Reference, Pre) \ |
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120 \ |
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121 /* Preload ref klasses and set reference types */ \ |
1142 | 122 template(SoftReference_klass, java_lang_ref_SoftReference, Pre) \ |
123 template(WeakReference_klass, java_lang_ref_WeakReference, Pre) \ | |
124 template(FinalReference_klass, java_lang_ref_FinalReference, Pre) \ | |
125 template(PhantomReference_klass, java_lang_ref_PhantomReference, Pre) \ | |
126 template(Finalizer_klass, java_lang_ref_Finalizer, Pre) \ | |
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127 \ |
1142 | 128 template(Thread_klass, java_lang_Thread, Pre) \ |
129 template(ThreadGroup_klass, java_lang_ThreadGroup, Pre) \ | |
130 template(Properties_klass, java_util_Properties, Pre) \ | |
131 template(reflect_AccessibleObject_klass, java_lang_reflect_AccessibleObject, Pre) \ | |
132 template(reflect_Field_klass, java_lang_reflect_Field, Pre) \ | |
133 template(reflect_Method_klass, java_lang_reflect_Method, Pre) \ | |
134 template(reflect_Constructor_klass, java_lang_reflect_Constructor, Pre) \ | |
132
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135 \ |
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136 /* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \ |
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137 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \ |
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138 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \ |
1142 | 139 template(reflect_MagicAccessorImpl_klass, sun_reflect_MagicAccessorImpl, Opt) \ |
140 template(reflect_MethodAccessorImpl_klass, sun_reflect_MethodAccessorImpl, Opt_Only_JDK14NewRef) \ | |
141 template(reflect_ConstructorAccessorImpl_klass, sun_reflect_ConstructorAccessorImpl, Opt_Only_JDK14NewRef) \ | |
142 template(reflect_DelegatingClassLoader_klass, sun_reflect_DelegatingClassLoader, Opt) \ | |
143 template(reflect_ConstantPool_klass, sun_reflect_ConstantPool, Opt_Only_JDK15) \ | |
144 template(reflect_UnsafeStaticFieldAccessorImpl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15) \ | |
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145 \ |
710 | 146 /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \ |
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147 template(MethodHandle_klass, java_lang_invoke_MethodHandle, Pre_JSR292) \ |
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148 template(MemberName_klass, java_lang_invoke_MemberName, Pre_JSR292) \ |
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149 template(MethodHandleNatives_klass, java_lang_invoke_MethodHandleNatives, Pre_JSR292) \ |
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150 template(AdapterMethodHandle_klass, java_lang_invoke_AdapterMethodHandle, Pre_JSR292) \ |
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151 template(BoundMethodHandle_klass, java_lang_invoke_BoundMethodHandle, Pre_JSR292) \ |
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152 template(DirectMethodHandle_klass, java_lang_invoke_DirectMethodHandle, Pre_JSR292) \ |
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153 template(MethodType_klass, java_lang_invoke_MethodType, Pre_JSR292) \ |
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154 template(MethodTypeForm_klass, java_lang_invoke_MethodTypeForm, Pre_JSR292) \ |
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155 template(BootstrapMethodError_klass, java_lang_BootstrapMethodError, Pre_JSR292) \ |
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156 template(WrongMethodTypeException_klass, java_lang_invoke_WrongMethodTypeException, Pre_JSR292) \ |
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157 template(CallSite_klass, java_lang_invoke_CallSite, Pre_JSR292) \ |
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158 /* Note: MethodHandle must be first, and CallSite last in group */ \ |
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159 \ |
1142 | 160 template(StringBuffer_klass, java_lang_StringBuffer, Pre) \ |
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161 template(StringBuilder_klass, java_lang_StringBuilder, Pre) \ |
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162 \ |
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163 /* It's NULL in non-1.4 JDKs. */ \ |
1142 | 164 template(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 template(java_nio_Buffer_klass, java_nio_Buffer, Opt) \ |
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168 \ |
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169 /* If this class isn't present, it won't be referenced. */ \ |
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170 template(sun_misc_AtomicLongCSImpl_klass, sun_misc_AtomicLongCSImpl, Opt) \ |
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171 \ |
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172 template(sun_jkernel_DownloadManager_klass, sun_jkernel_DownloadManager, Opt_Kernel) \ |
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173 \ |
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174 template(sun_misc_PostVMInitHook_klass, sun_misc_PostVMInitHook, Opt) \ |
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175 \ |
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176 /* Preload boxing klasses */ \ |
1142 | 177 template(Boolean_klass, java_lang_Boolean, Pre) \ |
178 template(Character_klass, java_lang_Character, Pre) \ | |
179 template(Float_klass, java_lang_Float, Pre) \ | |
180 template(Double_klass, java_lang_Double, Pre) \ | |
181 template(Byte_klass, java_lang_Byte, Pre) \ | |
182 template(Short_klass, java_lang_Short, Pre) \ | |
183 template(Integer_klass, java_lang_Integer, Pre) \ | |
184 template(Long_klass, java_lang_Long, Pre) \ | |
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185 /*end*/ |
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186 |
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187 |
0 | 188 class SystemDictionary : AllStatic { |
189 friend class VMStructs; | |
190 friend class CompactingPermGenGen; | |
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191 friend class SystemDictionaryHandles; |
0 | 192 NOT_PRODUCT(friend class instanceKlassKlass;) |
193 | |
194 public: | |
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195 enum WKID { |
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196 NO_WKID = 0, |
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197 |
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198 #define WK_KLASS_ENUM(name, ignore_s, ignore_o) WK_KLASS_ENUM_NAME(name), |
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199 WK_KLASSES_DO(WK_KLASS_ENUM) |
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200 #undef WK_KLASS_ENUM |
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201 |
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202 WKID_LIMIT, |
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203 |
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204 FIRST_WKID = NO_WKID + 1 |
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205 }; |
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206 |
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207 enum InitOption { |
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208 Pre, // preloaded; error if not present |
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209 Pre_JSR292, // preloaded if EnableInvokeDynamic |
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210 |
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211 // Order is significant. Options before this point require resolve_or_fail. |
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212 // Options after this point will use resolve_or_null instead. |
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213 |
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214 Opt, // preload tried; NULL if not present |
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215 Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection |
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216 Opt_Only_JDK15, // preload tried; use only with JDK1.5+ |
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217 Opt_Kernel, // preload tried only #ifdef KERNEL |
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218 OPTION_LIMIT, |
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219 CEIL_LG_OPTION_LIMIT = 4 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT) |
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220 }; |
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221 |
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222 |
0 | 223 // Returns a class with a given class name and class loader. Loads the |
224 // class if needed. If not found a NoClassDefFoundError or a | |
225 // ClassNotFoundException is thrown, depending on the value on the | |
226 // throw_error flag. For most uses the throw_error argument should be set | |
227 // to true. | |
228 | |
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229 static klassOop resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS); |
0 | 230 // Convenient call for null loader and protection domain. |
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231 static klassOop resolve_or_fail(Symbol* class_name, bool throw_error, TRAPS); |
0 | 232 private: |
233 // handle error translation for resolve_or_null results | |
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234 static klassOop handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS); |
0 | 235 |
236 public: | |
237 | |
238 // Returns a class with a given class name and class loader. | |
239 // Loads the class if needed. If not found NULL is returned. | |
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240 static klassOop resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
0 | 241 // Version with null loader and protection domain |
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242 static klassOop resolve_or_null(Symbol* class_name, TRAPS); |
0 | 243 |
244 // Resolve a superclass or superinterface. Called from ClassFileParser, | |
245 // parse_interfaces, resolve_instance_class_or_null, load_shared_class | |
246 // "child_name" is the class whose super class or interface is being resolved. | |
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247 static klassOop resolve_super_or_fail(Symbol* child_name, |
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248 Symbol* class_name, |
0 | 249 Handle class_loader, |
250 Handle protection_domain, | |
251 bool is_superclass, | |
252 TRAPS); | |
253 | |
254 // Parse new stream. This won't update the system dictionary or | |
255 // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses. | |
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256 static klassOop parse_stream(Symbol* class_name, |
0 | 257 Handle class_loader, |
258 Handle protection_domain, | |
259 ClassFileStream* st, | |
431
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260 TRAPS) { |
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261 KlassHandle nullHandle; |
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262 return parse_stream(class_name, class_loader, protection_domain, st, nullHandle, NULL, THREAD); |
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263 } |
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264 static klassOop parse_stream(Symbol* class_name, |
431
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265 Handle class_loader, |
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266 Handle protection_domain, |
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267 ClassFileStream* st, |
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268 KlassHandle host_klass, |
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269 GrowableArray<Handle>* cp_patches, |
0 | 270 TRAPS); |
271 | |
272 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass) | |
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273 static klassOop resolve_from_stream(Symbol* class_name, Handle class_loader, |
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274 Handle protection_domain, |
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275 ClassFileStream* st, bool verify, TRAPS); |
0 | 276 |
277 // Lookup an already loaded class. If not found NULL is returned. | |
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278 static klassOop find(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
0 | 279 |
280 // Lookup an already loaded instance or array class. | |
281 // Do not make any queries to class loaders; consult only the cache. | |
282 // If not found NULL is returned. | |
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283 static klassOop find_instance_or_array_klass(Symbol* class_name, |
0 | 284 Handle class_loader, |
285 Handle protection_domain, | |
286 TRAPS); | |
287 | |
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288 // If the given name is known to vmSymbols, return the well-know klass: |
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289 static klassOop find_well_known_klass(Symbol* class_name); |
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290 |
0 | 291 // Lookup an instance or array class that has already been loaded |
292 // either into the given class loader, or else into another class | |
293 // loader that is constrained (via loader constraints) to produce | |
294 // a consistent class. Do not take protection domains into account. | |
295 // Do not make any queries to class loaders; consult only the cache. | |
296 // Return NULL if the class is not found. | |
297 // | |
298 // This function is a strict superset of find_instance_or_array_klass. | |
299 // This function (the unchecked version) makes a conservative prediction | |
300 // of the result of the checked version, assuming successful lookup. | |
301 // If both functions return non-null, they must return the same value. | |
302 // Also, the unchecked version may sometimes be non-null where the | |
303 // checked version is null. This can occur in several ways: | |
304 // 1. No query has yet been made to the class loader. | |
305 // 2. The class loader was queried, but chose not to delegate. | |
306 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain. | |
307 // 4. Loading was attempted, but there was a linkage error of some sort. | |
308 // In all of these cases, the loader constraints on this type are | |
309 // satisfied, and it is safe for classes in the given class loader | |
310 // to manipulate strongly-typed values of the found class, subject | |
311 // to local linkage and access checks. | |
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312 static klassOop find_constrained_instance_or_array_klass(Symbol* class_name, |
0 | 313 Handle class_loader, |
314 TRAPS); | |
315 | |
316 // Iterate over all klasses in dictionary | |
317 // Just the classes from defining class loaders | |
318 static void classes_do(void f(klassOop)); | |
319 // Added for initialize_itable_for_klass to handle exceptions | |
320 static void classes_do(void f(klassOop, TRAPS), TRAPS); | |
321 // All classes, and their class loaders | |
322 static void classes_do(void f(klassOop, oop)); | |
323 // All classes, and their class loaders | |
324 // (added for helpers that use HandleMarks and ResourceMarks) | |
325 static void classes_do(void f(klassOop, oop, TRAPS), TRAPS); | |
326 // All entries in the placeholder table and their class loaders | |
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327 static void placeholders_do(void f(Symbol*, oop)); |
0 | 328 |
329 // Iterate over all methods in all klasses in dictionary | |
330 static void methods_do(void f(methodOop)); | |
331 | |
332 // Garbage collection support | |
333 | |
334 // This method applies "blk->do_oop" to all the pointers to "system" | |
335 // classes and loaders. | |
336 static void always_strong_oops_do(OopClosure* blk); | |
337 static void always_strong_classes_do(OopClosure* blk); | |
338 // This method applies "blk->do_oop" to all the placeholders. | |
339 static void placeholders_do(OopClosure* blk); | |
340 | |
341 // Unload (that is, break root links to) all unmarked classes and | |
342 // loaders. Returns "true" iff something was unloaded. | |
343 static bool do_unloading(BoolObjectClosure* is_alive); | |
344 | |
345 // Applies "f->do_oop" to all root oops in the system dictionary. | |
346 static void oops_do(OopClosure* f); | |
347 | |
348 // System loader lock | |
349 static oop system_loader_lock() { return _system_loader_lock_obj; } | |
350 | |
351 private: | |
352 // Traverses preloaded oops: various system classes. These are | |
353 // guaranteed to be in the perm gen. | |
354 static void preloaded_oops_do(OopClosure* f); | |
355 static void lazily_loaded_oops_do(OopClosure* f); | |
356 | |
357 public: | |
358 // Sharing support. | |
359 static void reorder_dictionary(); | |
360 static void copy_buckets(char** top, char* end); | |
361 static void copy_table(char** top, char* end); | |
362 static void reverse(); | |
363 static void set_shared_dictionary(HashtableBucket* t, int length, | |
364 int number_of_entries); | |
365 // Printing | |
366 static void print() PRODUCT_RETURN; | |
367 static void print_class_statistics() PRODUCT_RETURN; | |
368 static void print_method_statistics() PRODUCT_RETURN; | |
369 | |
370 // Number of contained klasses | |
371 // This is both fully loaded classes and classes in the process | |
372 // of being loaded | |
373 static int number_of_classes(); | |
374 | |
375 // Monotonically increasing counter which grows as classes are | |
376 // loaded or modifications such as hot-swapping or setting/removing | |
377 // of breakpoints are performed | |
378 static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; } | |
379 // Needed by evolution and breakpoint code | |
380 static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; } | |
381 | |
382 // Verification | |
383 static void verify(); | |
384 | |
385 #ifdef ASSERT | |
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386 static bool is_internal_format(Symbol* class_name); |
0 | 387 #endif |
388 | |
389 // Verify class is in dictionary | |
390 static void verify_obj_klass_present(Handle obj, | |
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391 Symbol* class_name, |
0 | 392 Handle class_loader); |
393 | |
394 // Initialization | |
395 static void initialize(TRAPS); | |
396 | |
397 // Fast access to commonly used classes (preloaded) | |
398 static klassOop check_klass(klassOop k) { | |
399 assert(k != NULL, "preloaded klass not initialized"); | |
400 return k; | |
401 } | |
402 | |
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403 static klassOop check_klass_Pre(klassOop k) { return check_klass(k); } |
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404 static klassOop check_klass_Pre_JSR292(klassOop k) { return EnableInvokeDynamic ? check_klass(k) : k; } |
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405 static klassOop check_klass_Opt(klassOop k) { return k; } |
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406 static klassOop check_klass_Opt_Kernel(klassOop k) { return k; } //== Opt |
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407 static klassOop check_klass_Opt_Only_JDK15(klassOop k) { |
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408 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only"); |
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409 return k; |
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410 } |
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411 static klassOop check_klass_Opt_Only_JDK14NewRef(klassOop k) { |
0 | 412 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only"); |
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413 // despite the optional loading, if you use this it must be present: |
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414 return check_klass(k); |
0 | 415 } |
416 | |
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417 static bool initialize_wk_klass(WKID id, int init_opt, TRAPS); |
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418 static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS); |
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419 static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) { |
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420 int limit = (int)end_id + 1; |
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421 initialize_wk_klasses_until((WKID) limit, start_id, THREAD); |
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422 } |
0 | 423 |
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424 public: |
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425 #define WK_KLASS_DECLARE(name, ignore_symbol, option) \ |
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426 static klassOop name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } |
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427 WK_KLASSES_DO(WK_KLASS_DECLARE); |
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428 #undef WK_KLASS_DECLARE |
0 | 429 |
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430 // Local definition for direct access to the private array: |
147 | 431 #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)] |
0 | 432 |
433 static klassOop box_klass(BasicType t) { | |
434 assert((uint)t < T_VOID+1, "range check"); | |
435 return check_klass(_box_klasses[t]); | |
436 } | |
437 static BasicType box_klass_type(klassOop k); // inverse of box_klass | |
438 | |
439 // methods returning lazily loaded klasses | |
440 // The corresponding method to load the class must be called before calling them. | |
441 static klassOop abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); } | |
442 | |
443 static void load_abstract_ownable_synchronizer_klass(TRAPS); | |
444 | |
445 private: | |
446 // Tells whether ClassLoader.loadClassInternal is present | |
447 static bool has_loadClassInternal() { return _has_loadClassInternal; } | |
448 | |
449 public: | |
450 // Tells whether ClassLoader.checkPackageAccess is present | |
451 static bool has_checkPackageAccess() { return _has_checkPackageAccess; } | |
452 | |
1142 | 453 static bool Class_klass_loaded() { return WK_KLASS(Class_klass) != NULL; } |
454 static bool Cloneable_klass_loaded() { return WK_KLASS(Cloneable_klass) != NULL; } | |
0 | 455 |
456 // Returns default system loader | |
457 static oop java_system_loader(); | |
458 | |
459 // Compute the default system loader | |
460 static void compute_java_system_loader(TRAPS); | |
461 | |
462 private: | |
463 // Mirrors for primitive classes (created eagerly) | |
464 static oop check_mirror(oop m) { | |
465 assert(m != NULL, "mirror not initialized"); | |
466 return m; | |
467 } | |
468 | |
469 public: | |
470 // Note: java_lang_Class::primitive_type is the inverse of java_mirror | |
471 | |
472 // Check class loader constraints | |
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473 static bool add_loader_constraint(Symbol* name, Handle loader1, |
0 | 474 Handle loader2, TRAPS); |
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475 static char* check_signature_loaders(Symbol* signature, Handle loader1, |
0 | 476 Handle loader2, bool is_method, TRAPS); |
477 | |
710 | 478 // JSR 292 |
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479 // find the java.lang.invoke.MethodHandles::invoke method for a given signature |
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480 static methodOop find_method_handle_invoke(Symbol* name, |
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481 Symbol* signature, |
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482 KlassHandle accessing_klass, |
710 | 483 TRAPS); |
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484 // ask Java to compute a java.lang.invoke.MethodType object for a given signature |
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485 static Handle find_method_handle_type(Symbol* signature, |
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486 KlassHandle accessing_klass, |
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487 bool for_invokeGeneric, |
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488 bool& return_bcp_flag, |
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489 TRAPS); |
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490 // ask Java to compute a java.lang.invoke.MethodHandle object for a given CP entry |
1602 | 491 static Handle link_method_handle_constant(KlassHandle caller, |
492 int ref_kind, //e.g., JVM_REF_invokeVirtual | |
493 KlassHandle callee, | |
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494 Symbol* name, |
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495 Symbol* signature, |
1602 | 496 TRAPS); |
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497 // ask Java to create a dynamic call site, while linking an invokedynamic op |
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498 static Handle make_dynamic_call_site(Handle bootstrap_method, |
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499 // Callee information: |
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500 Symbol* name, |
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501 methodHandle signature_invoker, |
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502 Handle info, |
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503 // Caller information: |
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504 methodHandle caller_method, |
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505 int caller_bci, |
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506 TRAPS); |
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507 |
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508 // coordinate with Java about bootstrap methods |
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509 static Handle find_bootstrap_method(methodHandle caller_method, |
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510 int caller_bci, // N.B. must be an invokedynamic |
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511 int cache_index, // must be corresponding main_entry |
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512 Handle &argument_info_result, // static BSM arguments, if any |
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513 TRAPS); |
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514 |
0 | 515 // Utility for printing loader "name" as part of tracing constraints |
516 static const char* loader_name(oop loader) { | |
517 return ((loader) == NULL ? "<bootloader>" : | |
518 instanceKlass::cast((loader)->klass())->name()->as_C_string() ); | |
519 } | |
520 | |
521 // Record the error when the first attempt to resolve a reference from a constant | |
522 // pool entry to a class fails. | |
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523 static void add_resolution_error(constantPoolHandle pool, int which, Symbol* error); |
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524 static Symbol* find_resolution_error(constantPoolHandle pool, int which); |
0 | 525 |
526 private: | |
527 | |
528 enum Constants { | |
529 _loader_constraint_size = 107, // number of entries in constraint table | |
530 _resolution_error_size = 107, // number of entries in resolution error table | |
710 | 531 _invoke_method_size = 139, // number of entries in invoke method table |
0 | 532 _nof_buckets = 1009 // number of buckets in hash table |
533 }; | |
534 | |
535 | |
536 // Static variables | |
537 | |
538 // Hashtable holding loaded classes. | |
539 static Dictionary* _dictionary; | |
540 | |
541 // Hashtable holding placeholders for classes being loaded. | |
542 static PlaceholderTable* _placeholders; | |
543 | |
544 // Hashtable holding classes from the shared archive. | |
545 static Dictionary* _shared_dictionary; | |
546 | |
547 // Monotonically increasing counter which grows with | |
548 // _number_of_classes as well as hot-swapping and breakpoint setting | |
549 // and removal. | |
550 static int _number_of_modifications; | |
551 | |
552 // Lock object for system class loader | |
553 static oop _system_loader_lock_obj; | |
554 | |
555 // Constraints on class loaders | |
556 static LoaderConstraintTable* _loader_constraints; | |
557 | |
558 // Resolution errors | |
559 static ResolutionErrorTable* _resolution_errors; | |
560 | |
710 | 561 // Invoke methods (JSR 292) |
562 static SymbolPropertyTable* _invoke_method_table; | |
563 | |
0 | 564 public: |
565 // for VM_CounterDecay iteration support | |
566 friend class CounterDecay; | |
567 static klassOop try_get_next_class(); | |
568 | |
569 private: | |
570 static void validate_protection_domain(instanceKlassHandle klass, | |
571 Handle class_loader, | |
572 Handle protection_domain, TRAPS); | |
573 | |
574 friend class VM_PopulateDumpSharedSpace; | |
575 friend class TraversePlaceholdersClosure; | |
576 static Dictionary* dictionary() { return _dictionary; } | |
577 static Dictionary* shared_dictionary() { return _shared_dictionary; } | |
578 static PlaceholderTable* placeholders() { return _placeholders; } | |
579 static LoaderConstraintTable* constraints() { return _loader_constraints; } | |
580 static ResolutionErrorTable* resolution_errors() { return _resolution_errors; } | |
710 | 581 static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; } |
0 | 582 |
583 // Basic loading operations | |
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584 static klassOop resolve_instance_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
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585 static klassOop resolve_array_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
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586 static instanceKlassHandle handle_parallel_super_load(Symbol* class_name, Symbol* supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS); |
0 | 587 // Wait on SystemDictionary_lock; unlocks lockObject before |
588 // waiting; relocks lockObject with correct recursion count | |
589 // after waiting, but before reentering SystemDictionary_lock | |
590 // to preserve lock order semantics. | |
591 static void double_lock_wait(Handle lockObject, TRAPS); | |
592 static void define_instance_class(instanceKlassHandle k, TRAPS); | |
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593 static instanceKlassHandle find_or_define_instance_class(Symbol* class_name, |
0 | 594 Handle class_loader, |
595 instanceKlassHandle k, TRAPS); | |
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596 static instanceKlassHandle load_shared_class(Symbol* class_name, |
0 | 597 Handle class_loader, TRAPS); |
598 static instanceKlassHandle load_shared_class(instanceKlassHandle ik, | |
599 Handle class_loader, TRAPS); | |
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600 static instanceKlassHandle load_instance_class(Symbol* class_name, Handle class_loader, TRAPS); |
0 | 601 static Handle compute_loader_lock_object(Handle class_loader, TRAPS); |
602 static void check_loader_lock_contention(Handle loader_lock, TRAPS); | |
514 | 603 static bool is_parallelCapable(Handle class_loader); |
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604 static bool is_parallelDefine(Handle class_loader); |
0 | 605 |
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606 static klassOop find_shared_class(Symbol* class_name); |
0 | 607 |
608 // Setup link to hierarchy | |
609 static void add_to_hierarchy(instanceKlassHandle k, TRAPS); | |
610 | |
611 private: | |
612 // We pass in the hashtable index so we can calculate it outside of | |
613 // the SystemDictionary_lock. | |
614 | |
615 // Basic find on loaded classes | |
616 static klassOop find_class(int index, unsigned int hash, | |
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617 Symbol* name, Handle loader); |
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618 static klassOop find_class(Symbol* class_name, Handle class_loader); |
0 | 619 |
620 // Basic find on classes in the midst of being loaded | |
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621 static Symbol* find_placeholder(Symbol* name, Handle loader); |
0 | 622 |
623 // Updating entry in dictionary | |
624 // Add a completely loaded class | |
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625 static void add_klass(int index, Symbol* class_name, |
0 | 626 Handle class_loader, KlassHandle obj); |
627 | |
628 // Add a placeholder for a class being loaded | |
629 static void add_placeholder(int index, | |
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630 Symbol* class_name, |
0 | 631 Handle class_loader); |
632 static void remove_placeholder(int index, | |
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633 Symbol* class_name, |
0 | 634 Handle class_loader); |
635 | |
636 // Performs cleanups after resolve_super_or_fail. This typically needs | |
637 // to be called on failure. | |
638 // Won't throw, but can block. | |
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639 static void resolution_cleanups(Symbol* class_name, |
0 | 640 Handle class_loader, |
641 TRAPS); | |
642 | |
643 // Initialization | |
644 static void initialize_preloaded_classes(TRAPS); | |
645 | |
646 // Class loader constraints | |
647 static void check_constraints(int index, unsigned int hash, | |
648 instanceKlassHandle k, Handle loader, | |
649 bool defining, TRAPS); | |
650 static void update_dictionary(int d_index, unsigned int d_hash, | |
651 int p_index, unsigned int p_hash, | |
652 instanceKlassHandle k, Handle loader, TRAPS); | |
653 | |
654 // Variables holding commonly used klasses (preloaded) | |
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655 static klassOop _well_known_klasses[]; |
0 | 656 |
657 // Lazily loaded klasses | |
658 static volatile klassOop _abstract_ownable_synchronizer_klass; | |
659 | |
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660 // table of box klasses (int_klass, etc.) |
0 | 661 static klassOop _box_klasses[T_VOID+1]; |
662 | |
663 static oop _java_system_loader; | |
664 | |
665 static bool _has_loadClassInternal; | |
666 static bool _has_checkPackageAccess; | |
667 }; | |
665
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668 |
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669 class SystemDictionaryHandles : AllStatic { |
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670 public: |
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671 #define WK_KLASS_HANDLE_DECLARE(name, ignore_symbol, option) \ |
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672 static KlassHandle name() { \ |
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673 SystemDictionary::name(); \ |
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674 klassOop* loc = &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \ |
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675 return KlassHandle(loc, true); \ |
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676 } |
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677 WK_KLASSES_DO(WK_KLASS_HANDLE_DECLARE); |
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678 #undef WK_KLASS_HANDLE_DECLARE |
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679 |
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680 static KlassHandle box_klass(BasicType t); |
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681 }; |
1972 | 682 |
683 #endif // SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP |