Mercurial > hg > truffle
annotate src/share/vm/classfile/systemDictionary.hpp @ 2001:f2da85a9b08e
7001363: java/dyn/InvokeDynamic should not be a well-known class in the JVM
Summary: Because of the removal of language support, the JDK 7 API for JSR 292 no longer includes a public class named java/dyn/InvokeDynamic.
Reviewed-by: jrose, kvn
author | twisti |
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date | Tue, 30 Nov 2010 09:53:04 -0800 |
parents | f95d63e2154a |
children | 06f017f7daa7 8f8dfba37802 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2010, 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" | |
31 #include "oops/symbolOop.hpp" | |
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 // | |
38 // [class name,class loader] -> class i.e. [symbolOop,oop] -> klassOop | |
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) \ | |
132
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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) \ | |
132
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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 */ \ |
147 template(MethodHandle_klass, java_dyn_MethodHandle, Opt) \ | |
148 template(MemberName_klass, sun_dyn_MemberName, Opt) \ | |
149 template(MethodHandleImpl_klass, sun_dyn_MethodHandleImpl, Opt) \ | |
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150 template(MethodHandleNatives_klass, sun_dyn_MethodHandleNatives, Opt) \ |
710 | 151 template(AdapterMethodHandle_klass, sun_dyn_AdapterMethodHandle, Opt) \ |
152 template(BoundMethodHandle_klass, sun_dyn_BoundMethodHandle, Opt) \ | |
153 template(DirectMethodHandle_klass, sun_dyn_DirectMethodHandle, Opt) \ | |
154 template(MethodType_klass, java_dyn_MethodType, Opt) \ | |
155 template(MethodTypeForm_klass, java_dyn_MethodTypeForm, Opt) \ | |
156 template(WrongMethodTypeException_klass, java_dyn_WrongMethodTypeException, Opt) \ | |
726
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157 template(Linkage_klass, java_dyn_Linkage, Opt) \ |
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158 template(CallSite_klass, java_dyn_CallSite, Opt) \ |
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159 /* Note: MethodHandle must be first, and CallSite last in group */ \ |
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160 \ |
1142 | 161 template(StringBuffer_klass, java_lang_StringBuffer, Pre) \ |
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162 template(StringBuilder_klass, java_lang_StringBuilder, Pre) \ |
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163 \ |
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164 /* It's NULL in non-1.4 JDKs. */ \ |
1142 | 165 template(StackTraceElement_klass, java_lang_StackTraceElement, Opt) \ |
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166 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \ |
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167 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \ |
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168 template(java_nio_Buffer_klass, java_nio_Buffer, Opt) \ |
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169 \ |
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170 /* If this class isn't present, it won't be referenced. */ \ |
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171 template(sun_misc_AtomicLongCSImpl_klass, sun_misc_AtomicLongCSImpl, Opt) \ |
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172 \ |
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173 template(sun_jkernel_DownloadManager_klass, sun_jkernel_DownloadManager, Opt_Kernel) \ |
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174 \ |
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175 /* Preload boxing klasses */ \ |
1142 | 176 template(Boolean_klass, java_lang_Boolean, Pre) \ |
177 template(Character_klass, java_lang_Character, Pre) \ | |
178 template(Float_klass, java_lang_Float, Pre) \ | |
179 template(Double_klass, java_lang_Double, Pre) \ | |
180 template(Byte_klass, java_lang_Byte, Pre) \ | |
181 template(Short_klass, java_lang_Short, Pre) \ | |
182 template(Integer_klass, java_lang_Integer, Pre) \ | |
183 template(Long_klass, java_lang_Long, Pre) \ | |
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184 /*end*/ |
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185 |
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186 |
0 | 187 class SystemDictionary : AllStatic { |
188 friend class VMStructs; | |
189 friend class CompactingPermGenGen; | |
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190 friend class SystemDictionaryHandles; |
0 | 191 NOT_PRODUCT(friend class instanceKlassKlass;) |
192 | |
193 public: | |
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194 enum WKID { |
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195 NO_WKID = 0, |
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196 |
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197 #define WK_KLASS_ENUM(name, ignore_s, ignore_o) WK_KLASS_ENUM_NAME(name), |
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198 WK_KLASSES_DO(WK_KLASS_ENUM) |
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199 #undef WK_KLASS_ENUM |
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200 |
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201 WKID_LIMIT, |
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202 |
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203 FIRST_WKID = NO_WKID + 1 |
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204 }; |
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205 |
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206 enum InitOption { |
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207 Pre, // preloaded; error if not present |
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208 |
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209 // Order is significant. Options before this point require resolve_or_fail. |
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210 // Options after this point will use resolve_or_null instead. |
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211 |
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212 Opt, // preload tried; NULL if not present |
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213 Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection |
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214 Opt_Only_JDK15, // preload tried; use only with JDK1.5+ |
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215 Opt_Kernel, // preload tried only #ifdef KERNEL |
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216 OPTION_LIMIT, |
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217 CEIL_LG_OPTION_LIMIT = 4 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT) |
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218 }; |
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219 |
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220 |
0 | 221 // Returns a class with a given class name and class loader. Loads the |
222 // class if needed. If not found a NoClassDefFoundError or a | |
223 // ClassNotFoundException is thrown, depending on the value on the | |
224 // throw_error flag. For most uses the throw_error argument should be set | |
225 // to true. | |
226 | |
227 static klassOop resolve_or_fail(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS); | |
228 // Convenient call for null loader and protection domain. | |
229 static klassOop resolve_or_fail(symbolHandle class_name, bool throw_error, TRAPS); | |
230 private: | |
231 // handle error translation for resolve_or_null results | |
232 static klassOop handle_resolution_exception(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS); | |
233 | |
234 public: | |
235 | |
236 // Returns a class with a given class name and class loader. | |
237 // Loads the class if needed. If not found NULL is returned. | |
238 static klassOop resolve_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS); | |
239 // Version with null loader and protection domain | |
240 static klassOop resolve_or_null(symbolHandle class_name, TRAPS); | |
241 | |
242 // Resolve a superclass or superinterface. Called from ClassFileParser, | |
243 // parse_interfaces, resolve_instance_class_or_null, load_shared_class | |
244 // "child_name" is the class whose super class or interface is being resolved. | |
245 static klassOop resolve_super_or_fail(symbolHandle child_name, | |
246 symbolHandle class_name, | |
247 Handle class_loader, | |
248 Handle protection_domain, | |
249 bool is_superclass, | |
250 TRAPS); | |
251 | |
252 // Parse new stream. This won't update the system dictionary or | |
253 // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses. | |
254 static klassOop parse_stream(symbolHandle class_name, | |
255 Handle class_loader, | |
256 Handle protection_domain, | |
257 ClassFileStream* st, | |
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258 TRAPS) { |
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259 KlassHandle nullHandle; |
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260 return parse_stream(class_name, class_loader, protection_domain, st, nullHandle, NULL, THREAD); |
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261 } |
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262 static klassOop parse_stream(symbolHandle class_name, |
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263 Handle class_loader, |
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264 Handle protection_domain, |
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265 ClassFileStream* st, |
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266 KlassHandle host_klass, |
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267 GrowableArray<Handle>* cp_patches, |
0 | 268 TRAPS); |
269 | |
270 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass) | |
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271 static klassOop resolve_from_stream(symbolHandle class_name, Handle class_loader, |
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272 Handle protection_domain, |
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273 ClassFileStream* st, bool verify, TRAPS); |
0 | 274 |
275 // Lookup an already loaded class. If not found NULL is returned. | |
276 static klassOop find(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS); | |
277 | |
278 // Lookup an already loaded instance or array class. | |
279 // Do not make any queries to class loaders; consult only the cache. | |
280 // If not found NULL is returned. | |
281 static klassOop find_instance_or_array_klass(symbolHandle class_name, | |
282 Handle class_loader, | |
283 Handle protection_domain, | |
284 TRAPS); | |
285 | |
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286 // If the given name is known to vmSymbols, return the well-know klass: |
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287 static klassOop find_well_known_klass(symbolOop class_name); |
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288 |
0 | 289 // Lookup an instance or array class that has already been loaded |
290 // either into the given class loader, or else into another class | |
291 // loader that is constrained (via loader constraints) to produce | |
292 // a consistent class. Do not take protection domains into account. | |
293 // Do not make any queries to class loaders; consult only the cache. | |
294 // Return NULL if the class is not found. | |
295 // | |
296 // This function is a strict superset of find_instance_or_array_klass. | |
297 // This function (the unchecked version) makes a conservative prediction | |
298 // of the result of the checked version, assuming successful lookup. | |
299 // If both functions return non-null, they must return the same value. | |
300 // Also, the unchecked version may sometimes be non-null where the | |
301 // checked version is null. This can occur in several ways: | |
302 // 1. No query has yet been made to the class loader. | |
303 // 2. The class loader was queried, but chose not to delegate. | |
304 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain. | |
305 // 4. Loading was attempted, but there was a linkage error of some sort. | |
306 // In all of these cases, the loader constraints on this type are | |
307 // satisfied, and it is safe for classes in the given class loader | |
308 // to manipulate strongly-typed values of the found class, subject | |
309 // to local linkage and access checks. | |
310 static klassOop find_constrained_instance_or_array_klass(symbolHandle class_name, | |
311 Handle class_loader, | |
312 TRAPS); | |
313 | |
314 // Iterate over all klasses in dictionary | |
315 // Just the classes from defining class loaders | |
316 static void classes_do(void f(klassOop)); | |
317 // Added for initialize_itable_for_klass to handle exceptions | |
318 static void classes_do(void f(klassOop, TRAPS), TRAPS); | |
319 // All classes, and their class loaders | |
320 static void classes_do(void f(klassOop, oop)); | |
321 // All classes, and their class loaders | |
322 // (added for helpers that use HandleMarks and ResourceMarks) | |
323 static void classes_do(void f(klassOop, oop, TRAPS), TRAPS); | |
324 // All entries in the placeholder table and their class loaders | |
325 static void placeholders_do(void f(symbolOop, oop)); | |
326 | |
327 // Iterate over all methods in all klasses in dictionary | |
328 static void methods_do(void f(methodOop)); | |
329 | |
330 // Garbage collection support | |
331 | |
332 // This method applies "blk->do_oop" to all the pointers to "system" | |
333 // classes and loaders. | |
334 static void always_strong_oops_do(OopClosure* blk); | |
335 static void always_strong_classes_do(OopClosure* blk); | |
336 // This method applies "blk->do_oop" to all the placeholders. | |
337 static void placeholders_do(OopClosure* blk); | |
338 | |
339 // Unload (that is, break root links to) all unmarked classes and | |
340 // loaders. Returns "true" iff something was unloaded. | |
341 static bool do_unloading(BoolObjectClosure* is_alive); | |
342 | |
343 // Applies "f->do_oop" to all root oops in the system dictionary. | |
344 static void oops_do(OopClosure* f); | |
345 | |
346 // System loader lock | |
347 static oop system_loader_lock() { return _system_loader_lock_obj; } | |
348 | |
349 private: | |
350 // Traverses preloaded oops: various system classes. These are | |
351 // guaranteed to be in the perm gen. | |
352 static void preloaded_oops_do(OopClosure* f); | |
353 static void lazily_loaded_oops_do(OopClosure* f); | |
354 | |
355 public: | |
356 // Sharing support. | |
357 static void reorder_dictionary(); | |
358 static void copy_buckets(char** top, char* end); | |
359 static void copy_table(char** top, char* end); | |
360 static void reverse(); | |
361 static void set_shared_dictionary(HashtableBucket* t, int length, | |
362 int number_of_entries); | |
363 // Printing | |
364 static void print() PRODUCT_RETURN; | |
365 static void print_class_statistics() PRODUCT_RETURN; | |
366 static void print_method_statistics() PRODUCT_RETURN; | |
367 | |
368 // Number of contained klasses | |
369 // This is both fully loaded classes and classes in the process | |
370 // of being loaded | |
371 static int number_of_classes(); | |
372 | |
373 // Monotonically increasing counter which grows as classes are | |
374 // loaded or modifications such as hot-swapping or setting/removing | |
375 // of breakpoints are performed | |
376 static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; } | |
377 // Needed by evolution and breakpoint code | |
378 static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; } | |
379 | |
380 // Verification | |
381 static void verify(); | |
382 | |
383 #ifdef ASSERT | |
384 static bool is_internal_format(symbolHandle class_name); | |
385 #endif | |
386 | |
387 // Verify class is in dictionary | |
388 static void verify_obj_klass_present(Handle obj, | |
389 symbolHandle class_name, | |
390 Handle class_loader); | |
391 | |
392 // Initialization | |
393 static void initialize(TRAPS); | |
394 | |
395 // Fast access to commonly used classes (preloaded) | |
396 static klassOop check_klass(klassOop k) { | |
397 assert(k != NULL, "preloaded klass not initialized"); | |
398 return k; | |
399 } | |
400 | |
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401 static klassOop check_klass_Pre(klassOop k) { return check_klass(k); } |
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402 static klassOop check_klass_Opt(klassOop k) { return k; } |
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403 static klassOop check_klass_Opt_Kernel(klassOop k) { return k; } //== Opt |
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404 static klassOop check_klass_Opt_Only_JDK15(klassOop k) { |
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405 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only"); |
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406 return k; |
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407 } |
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408 static klassOop check_klass_Opt_Only_JDK14NewRef(klassOop k) { |
0 | 409 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only"); |
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410 // despite the optional loading, if you use this it must be present: |
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411 return check_klass(k); |
0 | 412 } |
413 | |
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414 static bool initialize_wk_klass(WKID id, int init_opt, TRAPS); |
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415 static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS); |
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416 static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) { |
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417 int limit = (int)end_id + 1; |
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418 initialize_wk_klasses_until((WKID) limit, start_id, THREAD); |
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419 } |
0 | 420 |
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421 public: |
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422 #define WK_KLASS_DECLARE(name, ignore_symbol, option) \ |
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423 static klassOop name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } |
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424 WK_KLASSES_DO(WK_KLASS_DECLARE); |
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425 #undef WK_KLASS_DECLARE |
0 | 426 |
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427 // Local definition for direct access to the private array: |
147 | 428 #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)] |
0 | 429 |
430 static klassOop box_klass(BasicType t) { | |
431 assert((uint)t < T_VOID+1, "range check"); | |
432 return check_klass(_box_klasses[t]); | |
433 } | |
434 static BasicType box_klass_type(klassOop k); // inverse of box_klass | |
435 | |
436 // methods returning lazily loaded klasses | |
437 // The corresponding method to load the class must be called before calling them. | |
438 static klassOop abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); } | |
439 | |
440 static void load_abstract_ownable_synchronizer_klass(TRAPS); | |
441 | |
442 private: | |
443 // Tells whether ClassLoader.loadClassInternal is present | |
444 static bool has_loadClassInternal() { return _has_loadClassInternal; } | |
445 | |
446 public: | |
447 // Tells whether ClassLoader.checkPackageAccess is present | |
448 static bool has_checkPackageAccess() { return _has_checkPackageAccess; } | |
449 | |
1142 | 450 static bool Class_klass_loaded() { return WK_KLASS(Class_klass) != NULL; } |
451 static bool Cloneable_klass_loaded() { return WK_KLASS(Cloneable_klass) != NULL; } | |
0 | 452 |
453 // Returns default system loader | |
454 static oop java_system_loader(); | |
455 | |
456 // Compute the default system loader | |
457 static void compute_java_system_loader(TRAPS); | |
458 | |
459 private: | |
460 // Mirrors for primitive classes (created eagerly) | |
461 static oop check_mirror(oop m) { | |
462 assert(m != NULL, "mirror not initialized"); | |
463 return m; | |
464 } | |
465 | |
466 public: | |
467 // Note: java_lang_Class::primitive_type is the inverse of java_mirror | |
468 | |
469 // Check class loader constraints | |
470 static bool add_loader_constraint(symbolHandle name, Handle loader1, | |
471 Handle loader2, TRAPS); | |
472 static char* check_signature_loaders(symbolHandle signature, Handle loader1, | |
473 Handle loader2, bool is_method, TRAPS); | |
474 | |
710 | 475 // JSR 292 |
476 // find the java.dyn.MethodHandles::invoke method for a given signature | |
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477 static methodOop find_method_handle_invoke(symbolHandle name, |
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478 symbolHandle signature, |
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479 KlassHandle accessing_klass, |
710 | 480 TRAPS); |
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481 // ask Java to compute a java.dyn.MethodType object for a given signature |
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482 static Handle find_method_handle_type(symbolHandle signature, |
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483 KlassHandle accessing_klass, |
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484 bool for_invokeGeneric, |
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485 bool& return_bcp_flag, |
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486 TRAPS); |
1602 | 487 // ask Java to compute a java.dyn.MethodHandle object for a given CP entry |
488 static Handle link_method_handle_constant(KlassHandle caller, | |
489 int ref_kind, //e.g., JVM_REF_invokeVirtual | |
490 KlassHandle callee, | |
491 symbolHandle name, | |
492 symbolHandle signature, | |
493 TRAPS); | |
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494 // ask Java to create a dynamic call site, while linking an invokedynamic op |
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495 static Handle make_dynamic_call_site(Handle bootstrap_method, |
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496 // Callee information: |
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497 symbolHandle name, |
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498 methodHandle signature_invoker, |
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499 Handle info, |
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500 // Caller information: |
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501 methodHandle caller_method, |
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502 int caller_bci, |
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503 TRAPS); |
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504 |
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505 // coordinate with Java about bootstrap methods |
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506 static Handle find_bootstrap_method(methodHandle caller_method, |
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507 int caller_bci, // N.B. must be an invokedynamic |
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508 int cache_index, // must be corresponding main_entry |
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509 Handle &argument_info_result, // static BSM arguments, if any |
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510 TRAPS); |
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511 |
0 | 512 // Utility for printing loader "name" as part of tracing constraints |
513 static const char* loader_name(oop loader) { | |
514 return ((loader) == NULL ? "<bootloader>" : | |
515 instanceKlass::cast((loader)->klass())->name()->as_C_string() ); | |
516 } | |
517 | |
518 // Record the error when the first attempt to resolve a reference from a constant | |
519 // pool entry to a class fails. | |
520 static void add_resolution_error(constantPoolHandle pool, int which, symbolHandle error); | |
521 static symbolOop find_resolution_error(constantPoolHandle pool, int which); | |
522 | |
523 private: | |
524 | |
525 enum Constants { | |
526 _loader_constraint_size = 107, // number of entries in constraint table | |
527 _resolution_error_size = 107, // number of entries in resolution error table | |
710 | 528 _invoke_method_size = 139, // number of entries in invoke method table |
0 | 529 _nof_buckets = 1009 // number of buckets in hash table |
530 }; | |
531 | |
532 | |
533 // Static variables | |
534 | |
535 // Hashtable holding loaded classes. | |
536 static Dictionary* _dictionary; | |
537 | |
538 // Hashtable holding placeholders for classes being loaded. | |
539 static PlaceholderTable* _placeholders; | |
540 | |
541 // Hashtable holding classes from the shared archive. | |
542 static Dictionary* _shared_dictionary; | |
543 | |
544 // Monotonically increasing counter which grows with | |
545 // _number_of_classes as well as hot-swapping and breakpoint setting | |
546 // and removal. | |
547 static int _number_of_modifications; | |
548 | |
549 // Lock object for system class loader | |
550 static oop _system_loader_lock_obj; | |
551 | |
552 // Constraints on class loaders | |
553 static LoaderConstraintTable* _loader_constraints; | |
554 | |
555 // Resolution errors | |
556 static ResolutionErrorTable* _resolution_errors; | |
557 | |
710 | 558 // Invoke methods (JSR 292) |
559 static SymbolPropertyTable* _invoke_method_table; | |
560 | |
0 | 561 public: |
562 // for VM_CounterDecay iteration support | |
563 friend class CounterDecay; | |
564 static klassOop try_get_next_class(); | |
565 | |
566 private: | |
567 static void validate_protection_domain(instanceKlassHandle klass, | |
568 Handle class_loader, | |
569 Handle protection_domain, TRAPS); | |
570 | |
571 friend class VM_PopulateDumpSharedSpace; | |
572 friend class TraversePlaceholdersClosure; | |
573 static Dictionary* dictionary() { return _dictionary; } | |
574 static Dictionary* shared_dictionary() { return _shared_dictionary; } | |
575 static PlaceholderTable* placeholders() { return _placeholders; } | |
576 static LoaderConstraintTable* constraints() { return _loader_constraints; } | |
577 static ResolutionErrorTable* resolution_errors() { return _resolution_errors; } | |
710 | 578 static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; } |
0 | 579 |
580 // Basic loading operations | |
581 static klassOop resolve_instance_class_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS); | |
582 static klassOop resolve_array_class_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS); | |
583 static instanceKlassHandle handle_parallel_super_load(symbolHandle class_name, symbolHandle supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS); | |
584 // Wait on SystemDictionary_lock; unlocks lockObject before | |
585 // waiting; relocks lockObject with correct recursion count | |
586 // after waiting, but before reentering SystemDictionary_lock | |
587 // to preserve lock order semantics. | |
588 static void double_lock_wait(Handle lockObject, TRAPS); | |
589 static void define_instance_class(instanceKlassHandle k, TRAPS); | |
590 static instanceKlassHandle find_or_define_instance_class(symbolHandle class_name, | |
591 Handle class_loader, | |
592 instanceKlassHandle k, TRAPS); | |
593 static instanceKlassHandle load_shared_class(symbolHandle class_name, | |
594 Handle class_loader, TRAPS); | |
595 static instanceKlassHandle load_shared_class(instanceKlassHandle ik, | |
596 Handle class_loader, TRAPS); | |
597 static instanceKlassHandle load_instance_class(symbolHandle class_name, Handle class_loader, TRAPS); | |
598 static Handle compute_loader_lock_object(Handle class_loader, TRAPS); | |
599 static void check_loader_lock_contention(Handle loader_lock, TRAPS); | |
514 | 600 static bool is_parallelCapable(Handle class_loader); |
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601 static bool is_parallelDefine(Handle class_loader); |
0 | 602 |
603 static klassOop find_shared_class(symbolHandle class_name); | |
604 | |
605 // Setup link to hierarchy | |
606 static void add_to_hierarchy(instanceKlassHandle k, TRAPS); | |
607 | |
608 private: | |
609 // We pass in the hashtable index so we can calculate it outside of | |
610 // the SystemDictionary_lock. | |
611 | |
612 // Basic find on loaded classes | |
613 static klassOop find_class(int index, unsigned int hash, | |
614 symbolHandle name, Handle loader); | |
615 | |
616 // Basic find on classes in the midst of being loaded | |
617 static symbolOop find_placeholder(int index, unsigned int hash, | |
618 symbolHandle name, Handle loader); | |
619 | |
620 // Basic find operation of loaded classes and classes in the midst | |
621 // of loading; used for assertions and verification only. | |
622 static oop find_class_or_placeholder(symbolHandle class_name, | |
623 Handle class_loader); | |
624 | |
625 // Updating entry in dictionary | |
626 // Add a completely loaded class | |
627 static void add_klass(int index, symbolHandle class_name, | |
628 Handle class_loader, KlassHandle obj); | |
629 | |
630 // Add a placeholder for a class being loaded | |
631 static void add_placeholder(int index, | |
632 symbolHandle class_name, | |
633 Handle class_loader); | |
634 static void remove_placeholder(int index, | |
635 symbolHandle class_name, | |
636 Handle class_loader); | |
637 | |
638 // Performs cleanups after resolve_super_or_fail. This typically needs | |
639 // to be called on failure. | |
640 // Won't throw, but can block. | |
641 static void resolution_cleanups(symbolHandle class_name, | |
642 Handle class_loader, | |
643 TRAPS); | |
644 | |
645 // Initialization | |
646 static void initialize_preloaded_classes(TRAPS); | |
647 | |
648 // Class loader constraints | |
649 static void check_constraints(int index, unsigned int hash, | |
650 instanceKlassHandle k, Handle loader, | |
651 bool defining, TRAPS); | |
652 static void update_dictionary(int d_index, unsigned int d_hash, | |
653 int p_index, unsigned int p_hash, | |
654 instanceKlassHandle k, Handle loader, TRAPS); | |
655 | |
656 // Variables holding commonly used klasses (preloaded) | |
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657 static klassOop _well_known_klasses[]; |
0 | 658 |
659 // Lazily loaded klasses | |
660 static volatile klassOop _abstract_ownable_synchronizer_klass; | |
661 | |
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662 // table of box klasses (int_klass, etc.) |
0 | 663 static klassOop _box_klasses[T_VOID+1]; |
664 | |
665 static oop _java_system_loader; | |
666 | |
667 static bool _has_loadClassInternal; | |
668 static bool _has_checkPackageAccess; | |
669 }; | |
665
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670 |
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671 // Cf. vmSymbols vs. vmSymbolHandles |
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672 class SystemDictionaryHandles : AllStatic { |
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673 public: |
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674 #define WK_KLASS_HANDLE_DECLARE(name, ignore_symbol, option) \ |
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675 static KlassHandle name() { \ |
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676 SystemDictionary::name(); \ |
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677 klassOop* loc = &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \ |
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678 return KlassHandle(loc, true); \ |
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679 } |
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680 WK_KLASSES_DO(WK_KLASS_HANDLE_DECLARE); |
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681 #undef WK_KLASS_HANDLE_DECLARE |
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682 |
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683 static KlassHandle box_klass(BasicType t); |
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684 }; |
1972 | 685 |
686 #endif // SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP |