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annotate src/share/vm/classfile/systemDictionary.hpp @ 12888:4a2acfb16e97
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Reviewed-by: kvn, twisti
author | rbackman |
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date | Fri, 11 Oct 2013 12:06:14 +0200 |
parents | ca0165daa6ec |
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0 | 1 /* |
7951 | 2 * Copyright (c) 1997, 2013, 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" | |
10405 | 34 #include "trace/traceTime.hpp" |
1972 | 35 #include "utilities/hashtable.hpp" |
6197 | 36 #include "utilities/hashtable.inline.hpp" |
1972 | 37 |
10405 | 38 |
0 | 39 // The system dictionary stores all loaded classes and maps: |
40 // | |
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41 // [class name,class loader] -> class i.e. [Symbol*,oop] -> Klass* |
0 | 42 // |
43 // Classes are loaded lazily. The default VM class loader is | |
44 // represented as NULL. | |
45 | |
46 // The underlying data structure is an open hash table with a fixed number | |
47 // of buckets. During loading the loader object is locked, (for the VM loader | |
48 // a private lock object is used). Class loading can thus be done concurrently, | |
49 // but only by different loaders. | |
50 // | |
51 // During loading a placeholder (name, loader) is temporarily placed in | |
52 // a side data structure, and is used to detect ClassCircularityErrors | |
53 // and to perform verification during GC. A GC can occur in the midst | |
54 // of class loading, as we call out to Java, have to take locks, etc. | |
55 // | |
56 // When class loading is finished, a new entry is added to the system | |
57 // dictionary and the place holder is removed. Note that the protection | |
58 // domain field of the system dictionary has not yet been filled in when | |
59 // the "real" system dictionary entry is created. | |
60 // | |
61 // Clients of this class who are interested in finding if a class has | |
62 // been completely loaded -- not classes in the process of being loaded -- | |
63 // can read the SystemDictionary unlocked. This is safe because | |
64 // - entries are only deleted at safepoints | |
65 // - readers cannot come to a safepoint while actively examining | |
66 // an entry (an entry cannot be deleted from under a reader) | |
67 // - entries must be fully formed before they are available to concurrent | |
68 // readers (we must ensure write ordering) | |
69 // | |
70 // Note that placeholders are deleted at any time, as they are removed | |
71 // when a class is completely loaded. Therefore, readers as well as writers | |
72 // of placeholders must hold the SystemDictionary_lock. | |
73 // | |
74 | |
75 class Dictionary; | |
76 class PlaceholderTable; | |
77 class LoaderConstraintTable; | |
6197 | 78 template <MEMFLAGS F> class HashtableBucket; |
0 | 79 class ResolutionErrorTable; |
710 | 80 class SymbolPropertyTable; |
0 | 81 |
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82 // Certain classes are preloaded, such as java.lang.Object and java.lang.String. |
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83 // They are all "well-known", in the sense that no class loader is allowed |
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84 // to provide a different definition. |
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85 // |
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86 // These klasses must all have names defined in vmSymbols. |
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87 |
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88 #define WK_KLASS_ENUM_NAME(kname) kname##_knum |
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89 |
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90 // Each well-known class has a short klass name (like object_klass), |
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91 // a vmSymbol name (like java_lang_Object), and a flag word |
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92 // that makes some minor distinctions, like whether the klass |
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93 // is preloaded, optional, release-specific, etc. |
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94 // The order of these definitions is significant; it is the order in which |
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95 // preloading is actually performed by initialize_preloaded_classes. |
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96 |
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97 #define WK_KLASSES_DO(do_klass) \ |
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98 /* well-known classes */ \ |
6852 | 99 do_klass(Object_klass, java_lang_Object, Pre ) \ |
100 do_klass(String_klass, java_lang_String, Pre ) \ | |
101 do_klass(Class_klass, java_lang_Class, Pre ) \ | |
102 do_klass(Cloneable_klass, java_lang_Cloneable, Pre ) \ | |
103 do_klass(ClassLoader_klass, java_lang_ClassLoader, Pre ) \ | |
104 do_klass(Serializable_klass, java_io_Serializable, Pre ) \ | |
105 do_klass(System_klass, java_lang_System, Pre ) \ | |
106 do_klass(Throwable_klass, java_lang_Throwable, Pre ) \ | |
107 do_klass(Error_klass, java_lang_Error, Pre ) \ | |
108 do_klass(ThreadDeath_klass, java_lang_ThreadDeath, Pre ) \ | |
109 do_klass(Exception_klass, java_lang_Exception, Pre ) \ | |
110 do_klass(RuntimeException_klass, java_lang_RuntimeException, Pre ) \ | |
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111 do_klass(SecurityManager_klass, java_lang_SecurityManager, Pre ) \ |
6852 | 112 do_klass(ProtectionDomain_klass, java_security_ProtectionDomain, Pre ) \ |
113 do_klass(AccessControlContext_klass, java_security_AccessControlContext, Pre ) \ | |
114 do_klass(ClassNotFoundException_klass, java_lang_ClassNotFoundException, Pre ) \ | |
115 do_klass(NoClassDefFoundError_klass, java_lang_NoClassDefFoundError, Pre ) \ | |
116 do_klass(LinkageError_klass, java_lang_LinkageError, Pre ) \ | |
117 do_klass(ClassCastException_klass, java_lang_ClassCastException, Pre ) \ | |
118 do_klass(ArrayStoreException_klass, java_lang_ArrayStoreException, Pre ) \ | |
119 do_klass(VirtualMachineError_klass, java_lang_VirtualMachineError, Pre ) \ | |
120 do_klass(OutOfMemoryError_klass, java_lang_OutOfMemoryError, Pre ) \ | |
121 do_klass(StackOverflowError_klass, java_lang_StackOverflowError, Pre ) \ | |
122 do_klass(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre ) \ | |
123 do_klass(Reference_klass, java_lang_ref_Reference, Pre ) \ | |
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124 \ |
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125 /* Preload ref klasses and set reference types */ \ |
6852 | 126 do_klass(SoftReference_klass, java_lang_ref_SoftReference, Pre ) \ |
127 do_klass(WeakReference_klass, java_lang_ref_WeakReference, Pre ) \ | |
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128 do_klass(FinalReference_klass, java_lang_ref_FinalReference, Pre ) \ |
6852 | 129 do_klass(PhantomReference_klass, java_lang_ref_PhantomReference, Pre ) \ |
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130 do_klass(Finalizer_klass, java_lang_ref_Finalizer, Pre ) \ |
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131 \ |
6852 | 132 do_klass(Thread_klass, java_lang_Thread, Pre ) \ |
133 do_klass(ThreadGroup_klass, java_lang_ThreadGroup, Pre ) \ | |
134 do_klass(Properties_klass, java_util_Properties, Pre ) \ | |
135 do_klass(reflect_AccessibleObject_klass, java_lang_reflect_AccessibleObject, Pre ) \ | |
136 do_klass(reflect_Field_klass, java_lang_reflect_Field, Pre ) \ | |
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137 do_klass(reflect_Parameter_klass, java_lang_reflect_Parameter, Opt ) \ |
6852 | 138 do_klass(reflect_Method_klass, java_lang_reflect_Method, Pre ) \ |
139 do_klass(reflect_Constructor_klass, java_lang_reflect_Constructor, Pre ) \ | |
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140 \ |
3938 | 141 /* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \ |
142 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \ | |
143 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \ | |
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144 do_klass(lambda_MagicLambdaImpl_klass, java_lang_invoke_MagicLambdaImpl, Opt ) \ |
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145 do_klass(reflect_MagicAccessorImpl_klass, sun_reflect_MagicAccessorImpl, Opt ) \ |
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146 do_klass(reflect_MethodAccessorImpl_klass, sun_reflect_MethodAccessorImpl, Opt_Only_JDK14NewRef) \ |
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147 do_klass(reflect_ConstructorAccessorImpl_klass, sun_reflect_ConstructorAccessorImpl, Opt_Only_JDK14NewRef) \ |
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148 do_klass(reflect_DelegatingClassLoader_klass, sun_reflect_DelegatingClassLoader, Opt ) \ |
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149 do_klass(reflect_ConstantPool_klass, sun_reflect_ConstantPool, Opt_Only_JDK15 ) \ |
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150 do_klass(reflect_UnsafeStaticFieldAccessorImpl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15 ) \ |
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151 do_klass(reflect_CallerSensitive_klass, sun_reflect_CallerSensitive, Opt ) \ |
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152 \ |
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153 /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \ |
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154 do_klass(DirectMethodHandle_klass, java_lang_invoke_DirectMethodHandle, Opt ) \ |
6852 | 155 do_klass(MethodHandle_klass, java_lang_invoke_MethodHandle, Pre_JSR292 ) \ |
156 do_klass(MemberName_klass, java_lang_invoke_MemberName, Pre_JSR292 ) \ | |
157 do_klass(MethodHandleNatives_klass, java_lang_invoke_MethodHandleNatives, Pre_JSR292 ) \ | |
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158 do_klass(LambdaForm_klass, java_lang_invoke_LambdaForm, Opt ) \ |
6852 | 159 do_klass(MethodType_klass, java_lang_invoke_MethodType, Pre_JSR292 ) \ |
160 do_klass(BootstrapMethodError_klass, java_lang_BootstrapMethodError, Pre_JSR292 ) \ | |
161 do_klass(CallSite_klass, java_lang_invoke_CallSite, Pre_JSR292 ) \ | |
162 do_klass(ConstantCallSite_klass, java_lang_invoke_ConstantCallSite, Pre_JSR292 ) \ | |
163 do_klass(MutableCallSite_klass, java_lang_invoke_MutableCallSite, Pre_JSR292 ) \ | |
164 do_klass(VolatileCallSite_klass, java_lang_invoke_VolatileCallSite, Pre_JSR292 ) \ | |
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165 /* Note: MethodHandle must be first, and VolatileCallSite last in group */ \ |
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166 \ |
6852 | 167 do_klass(StringBuffer_klass, java_lang_StringBuffer, Pre ) \ |
168 do_klass(StringBuilder_klass, java_lang_StringBuilder, Pre ) \ | |
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169 \ |
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170 /* It's NULL in non-1.4 JDKs. */ \ |
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171 do_klass(StackTraceElement_klass, java_lang_StackTraceElement, Opt ) \ |
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172 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \ |
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173 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \ |
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174 do_klass(nio_Buffer_klass, java_nio_Buffer, Opt ) \ |
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175 \ |
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176 do_klass(PostVMInitHook_klass, sun_misc_PostVMInitHook, Opt ) \ |
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177 \ |
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178 /* Preload boxing klasses */ \ |
6852 | 179 do_klass(Boolean_klass, java_lang_Boolean, Pre ) \ |
180 do_klass(Character_klass, java_lang_Character, Pre ) \ | |
181 do_klass(Float_klass, java_lang_Float, Pre ) \ | |
182 do_klass(Double_klass, java_lang_Double, Pre ) \ | |
183 do_klass(Byte_klass, java_lang_Byte, Pre ) \ | |
184 do_klass(Short_klass, java_lang_Short, Pre ) \ | |
185 do_klass(Integer_klass, java_lang_Integer, Pre ) \ | |
186 do_klass(Long_klass, java_lang_Long, Pre ) \ | |
132
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187 /*end*/ |
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188 |
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189 |
0 | 190 class SystemDictionary : AllStatic { |
191 friend class VMStructs; | |
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192 friend class SystemDictionaryHandles; |
0 | 193 |
194 public: | |
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195 enum WKID { |
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196 NO_WKID = 0, |
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197 |
3938 | 198 #define WK_KLASS_ENUM(name, symbol, ignore_o) WK_KLASS_ENUM_NAME(name), WK_KLASS_ENUM_NAME(symbol) = WK_KLASS_ENUM_NAME(name), |
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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 |
6852 | 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 OPTION_LIMIT, |
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218 CEIL_LG_OPTION_LIMIT = 4 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT) |
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219 }; |
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220 |
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221 |
0 | 222 // Returns a class with a given class name and class loader. Loads the |
223 // class if needed. If not found a NoClassDefFoundError or a | |
224 // ClassNotFoundException is thrown, depending on the value on the | |
225 // throw_error flag. For most uses the throw_error argument should be set | |
226 // to true. | |
227 | |
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228 static Klass* resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS); |
0 | 229 // Convenient call for null loader and protection domain. |
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230 static Klass* resolve_or_fail(Symbol* class_name, bool throw_error, TRAPS); |
0 | 231 private: |
232 // handle error translation for resolve_or_null results | |
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233 static Klass* handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS); |
0 | 234 |
235 public: | |
236 | |
237 // Returns a class with a given class name and class loader. | |
238 // Loads the class if needed. If not found NULL is returned. | |
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239 static Klass* resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
0 | 240 // Version with null loader and protection domain |
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241 static Klass* resolve_or_null(Symbol* class_name, TRAPS); |
0 | 242 |
243 // Resolve a superclass or superinterface. Called from ClassFileParser, | |
244 // parse_interfaces, resolve_instance_class_or_null, load_shared_class | |
245 // "child_name" is the class whose super class or interface is being resolved. | |
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246 static Klass* resolve_super_or_fail(Symbol* child_name, |
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247 Symbol* class_name, |
0 | 248 Handle class_loader, |
249 Handle protection_domain, | |
250 bool is_superclass, | |
251 TRAPS); | |
252 | |
253 // Parse new stream. This won't update the system dictionary or | |
254 // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses. | |
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255 static Klass* parse_stream(Symbol* class_name, |
0 | 256 Handle class_loader, |
257 Handle protection_domain, | |
258 ClassFileStream* st, | |
431
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259 TRAPS) { |
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260 KlassHandle nullHandle; |
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261 return parse_stream(class_name, class_loader, protection_domain, st, nullHandle, NULL, THREAD); |
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262 } |
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263 static Klass* parse_stream(Symbol* class_name, |
431
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264 Handle class_loader, |
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265 Handle protection_domain, |
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266 ClassFileStream* st, |
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267 KlassHandle host_klass, |
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268 GrowableArray<Handle>* cp_patches, |
0 | 269 TRAPS); |
270 | |
271 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass) | |
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272 static Klass* resolve_from_stream(Symbol* class_name, Handle class_loader, |
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273 Handle protection_domain, |
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274 ClassFileStream* st, bool verify, TRAPS); |
0 | 275 |
276 // Lookup an already loaded class. If not found NULL is returned. | |
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277 static Klass* find(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
0 | 278 |
279 // Lookup an already loaded instance or array class. | |
280 // Do not make any queries to class loaders; consult only the cache. | |
281 // If not found NULL is returned. | |
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282 static Klass* find_instance_or_array_klass(Symbol* class_name, |
0 | 283 Handle class_loader, |
284 Handle protection_domain, | |
285 TRAPS); | |
286 | |
287 // Lookup an instance or array class that has already been loaded | |
288 // either into the given class loader, or else into another class | |
289 // loader that is constrained (via loader constraints) to produce | |
290 // a consistent class. Do not take protection domains into account. | |
291 // Do not make any queries to class loaders; consult only the cache. | |
292 // Return NULL if the class is not found. | |
293 // | |
294 // This function is a strict superset of find_instance_or_array_klass. | |
295 // This function (the unchecked version) makes a conservative prediction | |
296 // of the result of the checked version, assuming successful lookup. | |
297 // If both functions return non-null, they must return the same value. | |
298 // Also, the unchecked version may sometimes be non-null where the | |
299 // checked version is null. This can occur in several ways: | |
300 // 1. No query has yet been made to the class loader. | |
301 // 2. The class loader was queried, but chose not to delegate. | |
302 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain. | |
303 // 4. Loading was attempted, but there was a linkage error of some sort. | |
304 // In all of these cases, the loader constraints on this type are | |
305 // satisfied, and it is safe for classes in the given class loader | |
306 // to manipulate strongly-typed values of the found class, subject | |
307 // to local linkage and access checks. | |
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308 static Klass* find_constrained_instance_or_array_klass(Symbol* class_name, |
0 | 309 Handle class_loader, |
310 TRAPS); | |
311 | |
312 // Iterate over all klasses in dictionary | |
313 // Just the classes from defining class loaders | |
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314 static void classes_do(void f(Klass*)); |
0 | 315 // Added for initialize_itable_for_klass to handle exceptions |
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316 static void classes_do(void f(Klass*, TRAPS), TRAPS); |
0 | 317 // All classes, and their class loaders |
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318 static void classes_do(void f(Klass*, ClassLoaderData*)); |
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319 |
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320 static void placeholders_do(void f(Symbol*)); |
0 | 321 |
322 // Iterate over all methods in all klasses in dictionary | |
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323 static void methods_do(void f(Method*)); |
0 | 324 |
325 // Garbage collection support | |
326 | |
327 // This method applies "blk->do_oop" to all the pointers to "system" | |
328 // classes and loaders. | |
329 static void always_strong_oops_do(OopClosure* blk); | |
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330 static void always_strong_classes_do(KlassClosure* closure); |
0 | 331 |
332 // Unload (that is, break root links to) all unmarked classes and | |
333 // loaders. Returns "true" iff something was unloaded. | |
334 static bool do_unloading(BoolObjectClosure* is_alive); | |
335 | |
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336 static int calculate_systemdictionary_size(int loadedclasses); |
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337 |
0 | 338 // Applies "f->do_oop" to all root oops in the system dictionary. |
339 static void oops_do(OopClosure* f); | |
340 | |
341 // System loader lock | |
342 static oop system_loader_lock() { return _system_loader_lock_obj; } | |
343 | |
344 private: | |
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345 // Extended Redefine classes support (tbi) |
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346 static void preloaded_classes_do(KlassClosure* f); |
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347 static void lazily_loaded_classes_do(KlassClosure* f); |
0 | 348 public: |
349 // Sharing support. | |
350 static void reorder_dictionary(); | |
351 static void copy_buckets(char** top, char* end); | |
352 static void copy_table(char** top, char* end); | |
353 static void reverse(); | |
6197 | 354 static void set_shared_dictionary(HashtableBucket<mtClass>* t, int length, |
0 | 355 int number_of_entries); |
356 // Printing | |
357 static void print() PRODUCT_RETURN; | |
358 static void print_class_statistics() PRODUCT_RETURN; | |
359 static void print_method_statistics() PRODUCT_RETURN; | |
360 | |
361 // Number of contained klasses | |
362 // This is both fully loaded classes and classes in the process | |
363 // of being loaded | |
364 static int number_of_classes(); | |
365 | |
366 // Monotonically increasing counter which grows as classes are | |
367 // loaded or modifications such as hot-swapping or setting/removing | |
368 // of breakpoints are performed | |
369 static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; } | |
370 // Needed by evolution and breakpoint code | |
371 static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; } | |
372 | |
373 // Verification | |
374 static void verify(); | |
375 | |
376 #ifdef ASSERT | |
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377 static bool is_internal_format(Symbol* class_name); |
0 | 378 #endif |
379 | |
380 // Verify class is in dictionary | |
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381 static void verify_obj_klass_present(Symbol* class_name, |
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382 ClassLoaderData* loader_data); |
0 | 383 |
384 // Initialization | |
385 static void initialize(TRAPS); | |
386 | |
387 // Fast access to commonly used classes (preloaded) | |
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388 static Klass* check_klass(Klass* k) { |
0 | 389 assert(k != NULL, "preloaded klass not initialized"); |
390 return k; | |
391 } | |
392 | |
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393 static Klass* check_klass_Pre( Klass* k) { return check_klass(k); } |
6852 | 394 static Klass* check_klass_Pre_JSR292(Klass* k) { return EnableInvokeDynamic ? check_klass(k) : k; } |
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395 static Klass* check_klass_Opt( Klass* k) { return k; } |
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396 static Klass* check_klass_Opt_Only_JDK15(Klass* k) { |
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397 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only"); |
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398 return k; |
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399 } |
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400 static Klass* check_klass_Opt_Only_JDK14NewRef(Klass* k) { |
0 | 401 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only"); |
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402 // despite the optional loading, if you use this it must be present: |
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403 return check_klass(k); |
0 | 404 } |
405 | |
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406 static bool initialize_wk_klass(WKID id, int init_opt, TRAPS); |
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407 static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS); |
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408 static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) { |
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409 int limit = (int)end_id + 1; |
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410 initialize_wk_klasses_until((WKID) limit, start_id, THREAD); |
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411 } |
0 | 412 |
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413 public: |
3938 | 414 #define WK_KLASS_DECLARE(name, symbol, option) \ |
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415 static Klass* name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } \ |
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416 static Klass** name##_addr() { \ |
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417 return &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \ |
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418 } |
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419 WK_KLASSES_DO(WK_KLASS_DECLARE); |
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420 #undef WK_KLASS_DECLARE |
0 | 421 |
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422 static Klass* well_known_klass(WKID id) { |
3938 | 423 assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); |
424 return _well_known_klasses[id]; | |
425 } | |
426 | |
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427 static Klass** well_known_klass_addr(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 // Local definition for direct access to the private array: |
147 | 433 #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)] |
0 | 434 |
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435 static Klass* box_klass(BasicType t) { |
0 | 436 assert((uint)t < T_VOID+1, "range check"); |
437 return check_klass(_box_klasses[t]); | |
438 } | |
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439 static BasicType box_klass_type(Klass* k); // inverse of box_klass |
0 | 440 |
441 // methods returning lazily loaded klasses | |
442 // The corresponding method to load the class must be called before calling them. | |
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443 static Klass* abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); } |
0 | 444 |
445 static void load_abstract_ownable_synchronizer_klass(TRAPS); | |
446 | |
447 private: | |
448 // Tells whether ClassLoader.loadClassInternal is present | |
449 static bool has_loadClassInternal() { return _has_loadClassInternal; } | |
450 | |
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451 // Returns the class loader data to be used when looking up/updating the |
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452 // system dictionary. |
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453 static ClassLoaderData *class_loader_data(Handle class_loader) { |
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454 return ClassLoaderData::class_loader_data(class_loader()); |
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455 } |
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456 |
0 | 457 public: |
458 // Tells whether ClassLoader.checkPackageAccess is present | |
459 static bool has_checkPackageAccess() { return _has_checkPackageAccess; } | |
460 | |
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461 static bool Parameter_klass_loaded() { return WK_KLASS(reflect_Parameter_klass) != NULL; } |
1142 | 462 static bool Class_klass_loaded() { return WK_KLASS(Class_klass) != NULL; } |
463 static bool Cloneable_klass_loaded() { return WK_KLASS(Cloneable_klass) != NULL; } | |
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464 static bool Object_klass_loaded() { return WK_KLASS(Object_klass) != NULL; } |
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465 static bool ClassLoader_klass_loaded() { return WK_KLASS(ClassLoader_klass) != NULL; } |
0 | 466 |
467 // Returns default system loader | |
468 static oop java_system_loader(); | |
469 | |
470 // Compute the default system loader | |
471 static void compute_java_system_loader(TRAPS); | |
472 | |
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473 // Register a new class loader |
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474 static ClassLoaderData* register_loader(Handle class_loader, TRAPS); |
0 | 475 private: |
476 // Mirrors for primitive classes (created eagerly) | |
477 static oop check_mirror(oop m) { | |
478 assert(m != NULL, "mirror not initialized"); | |
479 return m; | |
480 } | |
481 | |
482 public: | |
483 // Note: java_lang_Class::primitive_type is the inverse of java_mirror | |
484 | |
485 // Check class loader constraints | |
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486 static bool add_loader_constraint(Symbol* name, Handle loader1, |
0 | 487 Handle loader2, TRAPS); |
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488 static Symbol* check_signature_loaders(Symbol* signature, Handle loader1, |
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489 Handle loader2, bool is_method, TRAPS); |
0 | 490 |
710 | 491 // JSR 292 |
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492 // find a java.lang.invoke.MethodHandle.invoke* method for a given signature |
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493 // (asks Java to compute it if necessary, except in a compiler thread) |
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494 static methodHandle find_method_handle_invoker(Symbol* name, |
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495 Symbol* signature, |
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496 KlassHandle accessing_klass, |
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497 Handle *appendix_result, |
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498 Handle *method_type_result, |
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499 TRAPS); |
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500 // for a given signature, find the internal MethodHandle method (linkTo* or invokeBasic) |
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501 // (does not ask Java, since this is a low-level intrinsic defined by the JVM) |
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502 static methodHandle find_method_handle_intrinsic(vmIntrinsics::ID iid, |
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503 Symbol* signature, |
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504 TRAPS); |
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505 // find a java.lang.invoke.MethodType object for a given signature |
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506 // (asks Java to compute it if necessary, except in a compiler thread) |
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507 static Handle find_method_handle_type(Symbol* signature, |
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508 KlassHandle accessing_klass, |
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509 TRAPS); |
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510 |
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511 // ask Java to compute a java.lang.invoke.MethodHandle object for a given CP entry |
1602 | 512 static Handle link_method_handle_constant(KlassHandle caller, |
513 int ref_kind, //e.g., JVM_REF_invokeVirtual | |
514 KlassHandle callee, | |
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515 Symbol* name, |
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516 Symbol* signature, |
1602 | 517 TRAPS); |
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518 |
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519 // ask Java to create a dynamic call site, while linking an invokedynamic op |
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520 static methodHandle find_dynamic_call_site_invoker(KlassHandle caller, |
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521 Handle bootstrap_method, |
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522 Symbol* name, |
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523 Symbol* type, |
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524 Handle *appendix_result, |
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525 Handle *method_type_result, |
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526 TRAPS); |
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527 |
0 | 528 // Utility for printing loader "name" as part of tracing constraints |
529 static const char* loader_name(oop loader) { | |
530 return ((loader) == NULL ? "<bootloader>" : | |
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531 InstanceKlass::cast((loader)->klass())->name()->as_C_string() ); |
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532 } |
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533 static const char* loader_name(ClassLoaderData* loader_data) { |
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534 return (loader_data->class_loader() == NULL ? "<bootloader>" : |
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535 InstanceKlass::cast((loader_data->class_loader())->klass())->name()->as_C_string() ); |
0 | 536 } |
537 | |
538 // Record the error when the first attempt to resolve a reference from a constant | |
539 // pool entry to a class fails. | |
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540 static void add_resolution_error(constantPoolHandle pool, int which, Symbol* error); |
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541 static void delete_resolution_error(ConstantPool* pool); |
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542 static Symbol* find_resolution_error(constantPoolHandle pool, int which); |
0 | 543 |
544 private: | |
545 | |
546 enum Constants { | |
547 _loader_constraint_size = 107, // number of entries in constraint table | |
548 _resolution_error_size = 107, // number of entries in resolution error table | |
710 | 549 _invoke_method_size = 139, // number of entries in invoke method table |
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550 _nof_buckets = 1009, // number of buckets in hash table for placeholders |
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551 _old_default_sdsize = 1009, // backward compat for system dictionary size |
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552 _prime_array_size = 8, // array of primes for system dictionary size |
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553 _average_depth_goal = 3 // goal for lookup length |
0 | 554 }; |
555 | |
556 | |
557 // Static variables | |
558 | |
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559 // hashtable sizes for system dictionary to allow growth |
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560 // prime numbers for system dictionary size |
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561 static int _sdgeneration; |
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562 static const int _primelist[_prime_array_size]; |
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563 |
0 | 564 // Hashtable holding loaded classes. |
565 static Dictionary* _dictionary; | |
566 | |
567 // Hashtable holding placeholders for classes being loaded. | |
568 static PlaceholderTable* _placeholders; | |
569 | |
570 // Hashtable holding classes from the shared archive. | |
571 static Dictionary* _shared_dictionary; | |
572 | |
573 // Monotonically increasing counter which grows with | |
574 // _number_of_classes as well as hot-swapping and breakpoint setting | |
575 // and removal. | |
576 static int _number_of_modifications; | |
577 | |
578 // Lock object for system class loader | |
579 static oop _system_loader_lock_obj; | |
580 | |
581 // Constraints on class loaders | |
582 static LoaderConstraintTable* _loader_constraints; | |
583 | |
584 // Resolution errors | |
585 static ResolutionErrorTable* _resolution_errors; | |
586 | |
710 | 587 // Invoke methods (JSR 292) |
588 static SymbolPropertyTable* _invoke_method_table; | |
589 | |
0 | 590 public: |
591 // for VM_CounterDecay iteration support | |
592 friend class CounterDecay; | |
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593 static Klass* try_get_next_class(); |
0 | 594 |
595 private: | |
596 static void validate_protection_domain(instanceKlassHandle klass, | |
597 Handle class_loader, | |
598 Handle protection_domain, TRAPS); | |
599 | |
600 friend class VM_PopulateDumpSharedSpace; | |
601 friend class TraversePlaceholdersClosure; | |
602 static Dictionary* dictionary() { return _dictionary; } | |
603 static Dictionary* shared_dictionary() { return _shared_dictionary; } | |
604 static PlaceholderTable* placeholders() { return _placeholders; } | |
605 static LoaderConstraintTable* constraints() { return _loader_constraints; } | |
606 static ResolutionErrorTable* resolution_errors() { return _resolution_errors; } | |
710 | 607 static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; } |
0 | 608 |
609 // Basic loading operations | |
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610 static Klass* resolve_instance_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
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611 static Klass* resolve_array_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); |
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612 static instanceKlassHandle handle_parallel_super_load(Symbol* class_name, Symbol* supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS); |
0 | 613 // Wait on SystemDictionary_lock; unlocks lockObject before |
614 // waiting; relocks lockObject with correct recursion count | |
615 // after waiting, but before reentering SystemDictionary_lock | |
616 // to preserve lock order semantics. | |
617 static void double_lock_wait(Handle lockObject, TRAPS); | |
618 static void define_instance_class(instanceKlassHandle k, TRAPS); | |
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619 static instanceKlassHandle find_or_define_instance_class(Symbol* class_name, |
0 | 620 Handle class_loader, |
621 instanceKlassHandle k, TRAPS); | |
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622 static instanceKlassHandle load_shared_class(Symbol* class_name, |
0 | 623 Handle class_loader, TRAPS); |
624 static instanceKlassHandle load_shared_class(instanceKlassHandle ik, | |
625 Handle class_loader, TRAPS); | |
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626 static void clean_up_shared_class(instanceKlassHandle ik, Handle class_loader, TRAPS); |
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627 static instanceKlassHandle load_instance_class(Symbol* class_name, Handle class_loader, TRAPS); |
0 | 628 static Handle compute_loader_lock_object(Handle class_loader, TRAPS); |
629 static void check_loader_lock_contention(Handle loader_lock, TRAPS); | |
514 | 630 static bool is_parallelCapable(Handle class_loader); |
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631 static bool is_parallelDefine(Handle class_loader); |
0 | 632 |
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633 public: |
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634 static bool is_ext_class_loader(Handle class_loader); |
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635 |
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636 private: |
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637 static Klass* find_shared_class(Symbol* class_name); |
0 | 638 |
639 // Setup link to hierarchy | |
640 static void add_to_hierarchy(instanceKlassHandle k, TRAPS); | |
641 | |
10405 | 642 // event based tracing |
643 static void post_class_load_event(TracingTime start_time, instanceKlassHandle k, | |
644 Handle initiating_loader); | |
0 | 645 // We pass in the hashtable index so we can calculate it outside of |
646 // the SystemDictionary_lock. | |
647 | |
648 // Basic find on loaded classes | |
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649 static Klass* find_class(int index, unsigned int hash, |
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650 Symbol* name, ClassLoaderData* loader_data); |
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651 static Klass* find_class(Symbol* class_name, ClassLoaderData* loader_data); |
0 | 652 |
653 // Basic find on classes in the midst of being loaded | |
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654 static Symbol* find_placeholder(Symbol* name, ClassLoaderData* loader_data); |
0 | 655 |
656 // Updating entry in dictionary | |
657 // Add a completely loaded class | |
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658 static void add_klass(int index, Symbol* class_name, |
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659 ClassLoaderData* loader_data, KlassHandle obj); |
0 | 660 |
661 // Add a placeholder for a class being loaded | |
662 static void add_placeholder(int index, | |
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663 Symbol* class_name, |
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664 ClassLoaderData* loader_data); |
0 | 665 static void remove_placeholder(int index, |
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666 Symbol* class_name, |
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667 ClassLoaderData* loader_data); |
0 | 668 |
669 // Performs cleanups after resolve_super_or_fail. This typically needs | |
670 // to be called on failure. | |
671 // Won't throw, but can block. | |
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672 static void resolution_cleanups(Symbol* class_name, |
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673 ClassLoaderData* loader_data, |
0 | 674 TRAPS); |
675 | |
676 // Initialization | |
677 static void initialize_preloaded_classes(TRAPS); | |
678 | |
679 // Class loader constraints | |
680 static void check_constraints(int index, unsigned int hash, | |
681 instanceKlassHandle k, Handle loader, | |
682 bool defining, TRAPS); | |
683 static void update_dictionary(int d_index, unsigned int d_hash, | |
684 int p_index, unsigned int p_hash, | |
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685 instanceKlassHandle k, Handle loader, |
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686 TRAPS); |
0 | 687 |
688 // Variables holding commonly used klasses (preloaded) | |
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689 static Klass* _well_known_klasses[]; |
0 | 690 |
691 // Lazily loaded klasses | |
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692 static Klass* volatile _abstract_ownable_synchronizer_klass; |
0 | 693 |
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694 // table of box klasses (int_klass, etc.) |
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695 static Klass* _box_klasses[T_VOID+1]; |
0 | 696 |
697 static oop _java_system_loader; | |
698 | |
699 static bool _has_loadClassInternal; | |
700 static bool _has_checkPackageAccess; | |
701 }; | |
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702 |
1972 | 703 #endif // SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP |