Mercurial > hg > truffle
annotate src/share/vm/classfile/systemDictionary.hpp @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
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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 | |
25 // The system dictionary stores all loaded classes and maps: | |
26 // | |
27 // [class name,class loader] -> class i.e. [symbolOop,oop] -> klassOop | |
28 // | |
29 // Classes are loaded lazily. The default VM class loader is | |
30 // represented as NULL. | |
31 | |
32 // The underlying data structure is an open hash table with a fixed number | |
33 // of buckets. During loading the loader object is locked, (for the VM loader | |
34 // a private lock object is used). Class loading can thus be done concurrently, | |
35 // but only by different loaders. | |
36 // | |
37 // During loading a placeholder (name, loader) is temporarily placed in | |
38 // a side data structure, and is used to detect ClassCircularityErrors | |
39 // and to perform verification during GC. A GC can occur in the midst | |
40 // of class loading, as we call out to Java, have to take locks, etc. | |
41 // | |
42 // When class loading is finished, a new entry is added to the system | |
43 // dictionary and the place holder is removed. Note that the protection | |
44 // domain field of the system dictionary has not yet been filled in when | |
45 // the "real" system dictionary entry is created. | |
46 // | |
47 // Clients of this class who are interested in finding if a class has | |
48 // been completely loaded -- not classes in the process of being loaded -- | |
49 // can read the SystemDictionary unlocked. This is safe because | |
50 // - entries are only deleted at safepoints | |
51 // - readers cannot come to a safepoint while actively examining | |
52 // an entry (an entry cannot be deleted from under a reader) | |
53 // - entries must be fully formed before they are available to concurrent | |
54 // readers (we must ensure write ordering) | |
55 // | |
56 // Note that placeholders are deleted at any time, as they are removed | |
57 // when a class is completely loaded. Therefore, readers as well as writers | |
58 // of placeholders must hold the SystemDictionary_lock. | |
59 // | |
60 | |
61 class Dictionary; | |
62 class PlaceholderTable; | |
63 class LoaderConstraintTable; | |
64 class HashtableBucket; | |
65 class ResolutionErrorTable; | |
710 | 66 class SymbolPropertyTable; |
0 | 67 |
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68 // Certain classes are preloaded, such as java.lang.Object and java.lang.String. |
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69 // They are all "well-known", in the sense that no class loader is allowed |
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70 // to provide a different definition. |
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71 // |
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72 // These klasses must all have names defined in vmSymbols. |
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73 |
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74 #define WK_KLASS_ENUM_NAME(kname) kname##_knum |
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75 |
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76 // Each well-known class has a short klass name (like object_klass), |
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77 // a vmSymbol name (like java_lang_Object), and a flag word |
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78 // that makes some minor distinctions, like whether the klass |
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79 // is preloaded, optional, release-specific, etc. |
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80 // The order of these definitions is significant; it is the order in which |
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81 // preloading is actually performed by initialize_preloaded_classes. |
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82 |
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83 #define WK_KLASSES_DO(template) \ |
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84 /* well-known classes */ \ |
1142 | 85 template(Object_klass, java_lang_Object, Pre) \ |
86 template(String_klass, java_lang_String, Pre) \ | |
87 template(Class_klass, java_lang_Class, Pre) \ | |
88 template(Cloneable_klass, java_lang_Cloneable, Pre) \ | |
89 template(ClassLoader_klass, java_lang_ClassLoader, Pre) \ | |
90 template(Serializable_klass, java_io_Serializable, Pre) \ | |
91 template(System_klass, java_lang_System, Pre) \ | |
92 template(Throwable_klass, java_lang_Throwable, Pre) \ | |
93 template(Error_klass, java_lang_Error, Pre) \ | |
94 template(ThreadDeath_klass, java_lang_ThreadDeath, Pre) \ | |
95 template(Exception_klass, java_lang_Exception, Pre) \ | |
96 template(RuntimeException_klass, java_lang_RuntimeException, Pre) \ | |
97 template(ProtectionDomain_klass, java_security_ProtectionDomain, Pre) \ | |
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98 template(AccessControlContext_klass, java_security_AccessControlContext, Pre) \ |
1142 | 99 template(ClassNotFoundException_klass, java_lang_ClassNotFoundException, Pre) \ |
100 template(NoClassDefFoundError_klass, java_lang_NoClassDefFoundError, Pre) \ | |
101 template(LinkageError_klass, java_lang_LinkageError, Pre) \ | |
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102 template(ClassCastException_klass, java_lang_ClassCastException, Pre) \ |
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103 template(ArrayStoreException_klass, java_lang_ArrayStoreException, Pre) \ |
1142 | 104 template(VirtualMachineError_klass, java_lang_VirtualMachineError, Pre) \ |
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105 template(OutOfMemoryError_klass, java_lang_OutOfMemoryError, Pre) \ |
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106 template(StackOverflowError_klass, java_lang_StackOverflowError, Pre) \ |
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107 template(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre) \ |
1142 | 108 template(Reference_klass, java_lang_ref_Reference, Pre) \ |
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109 \ |
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110 /* Preload ref klasses and set reference types */ \ |
1142 | 111 template(SoftReference_klass, java_lang_ref_SoftReference, Pre) \ |
112 template(WeakReference_klass, java_lang_ref_WeakReference, Pre) \ | |
113 template(FinalReference_klass, java_lang_ref_FinalReference, Pre) \ | |
114 template(PhantomReference_klass, java_lang_ref_PhantomReference, Pre) \ | |
115 template(Finalizer_klass, java_lang_ref_Finalizer, Pre) \ | |
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116 \ |
1142 | 117 template(Thread_klass, java_lang_Thread, Pre) \ |
118 template(ThreadGroup_klass, java_lang_ThreadGroup, Pre) \ | |
119 template(Properties_klass, java_util_Properties, Pre) \ | |
120 template(reflect_AccessibleObject_klass, java_lang_reflect_AccessibleObject, Pre) \ | |
121 template(reflect_Field_klass, java_lang_reflect_Field, Pre) \ | |
122 template(reflect_Method_klass, java_lang_reflect_Method, Pre) \ | |
123 template(reflect_Constructor_klass, java_lang_reflect_Constructor, Pre) \ | |
132
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124 \ |
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125 /* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \ |
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126 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \ |
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127 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \ |
1142 | 128 template(reflect_MagicAccessorImpl_klass, sun_reflect_MagicAccessorImpl, Opt) \ |
129 template(reflect_MethodAccessorImpl_klass, sun_reflect_MethodAccessorImpl, Opt_Only_JDK14NewRef) \ | |
130 template(reflect_ConstructorAccessorImpl_klass, sun_reflect_ConstructorAccessorImpl, Opt_Only_JDK14NewRef) \ | |
131 template(reflect_DelegatingClassLoader_klass, sun_reflect_DelegatingClassLoader, Opt) \ | |
132 template(reflect_ConstantPool_klass, sun_reflect_ConstantPool, Opt_Only_JDK15) \ | |
133 template(reflect_UnsafeStaticFieldAccessorImpl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15) \ | |
132
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134 \ |
710 | 135 /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \ |
136 template(MethodHandle_klass, java_dyn_MethodHandle, Opt) \ | |
137 template(MemberName_klass, sun_dyn_MemberName, Opt) \ | |
138 template(MethodHandleImpl_klass, sun_dyn_MethodHandleImpl, Opt) \ | |
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139 template(MethodHandleNatives_klass, sun_dyn_MethodHandleNatives, Opt) \ |
710 | 140 template(AdapterMethodHandle_klass, sun_dyn_AdapterMethodHandle, Opt) \ |
141 template(BoundMethodHandle_klass, sun_dyn_BoundMethodHandle, Opt) \ | |
142 template(DirectMethodHandle_klass, sun_dyn_DirectMethodHandle, Opt) \ | |
143 template(MethodType_klass, java_dyn_MethodType, Opt) \ | |
144 template(MethodTypeForm_klass, java_dyn_MethodTypeForm, Opt) \ | |
145 template(WrongMethodTypeException_klass, java_dyn_WrongMethodTypeException, Opt) \ | |
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146 template(Linkage_klass, java_dyn_Linkage, Opt) \ |
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147 template(CallSite_klass, java_dyn_CallSite, Opt) \ |
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148 template(InvokeDynamic_klass, java_dyn_InvokeDynamic, Opt) \ |
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149 /* Note: MethodHandle must be first, and InvokeDynamic last in group */ \ |
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150 \ |
1142 | 151 template(StringBuffer_klass, java_lang_StringBuffer, Pre) \ |
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152 template(StringBuilder_klass, java_lang_StringBuilder, Pre) \ |
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153 \ |
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154 /* It's NULL in non-1.4 JDKs. */ \ |
1142 | 155 template(StackTraceElement_klass, java_lang_StackTraceElement, Opt) \ |
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156 /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \ |
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157 /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \ |
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158 template(java_nio_Buffer_klass, java_nio_Buffer, Opt) \ |
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159 \ |
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160 /* If this class isn't present, it won't be referenced. */ \ |
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161 template(sun_misc_AtomicLongCSImpl_klass, sun_misc_AtomicLongCSImpl, Opt) \ |
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162 \ |
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163 template(sun_jkernel_DownloadManager_klass, sun_jkernel_DownloadManager, Opt_Kernel) \ |
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164 \ |
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165 /* Preload boxing klasses */ \ |
1142 | 166 template(Boolean_klass, java_lang_Boolean, Pre) \ |
167 template(Character_klass, java_lang_Character, Pre) \ | |
168 template(Float_klass, java_lang_Float, Pre) \ | |
169 template(Double_klass, java_lang_Double, Pre) \ | |
170 template(Byte_klass, java_lang_Byte, Pre) \ | |
171 template(Short_klass, java_lang_Short, Pre) \ | |
172 template(Integer_klass, java_lang_Integer, Pre) \ | |
173 template(Long_klass, java_lang_Long, Pre) \ | |
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174 /*end*/ |
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175 |
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176 |
0 | 177 class SystemDictionary : AllStatic { |
178 friend class VMStructs; | |
179 friend class CompactingPermGenGen; | |
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180 friend class SystemDictionaryHandles; |
0 | 181 NOT_PRODUCT(friend class instanceKlassKlass;) |
182 | |
183 public: | |
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184 enum WKID { |
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185 NO_WKID = 0, |
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186 |
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187 #define WK_KLASS_ENUM(name, ignore_s, ignore_o) WK_KLASS_ENUM_NAME(name), |
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188 WK_KLASSES_DO(WK_KLASS_ENUM) |
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189 #undef WK_KLASS_ENUM |
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190 |
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191 WKID_LIMIT, |
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192 |
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193 FIRST_WKID = NO_WKID + 1 |
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194 }; |
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195 |
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196 enum InitOption { |
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197 Pre, // preloaded; error if not present |
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198 |
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199 // Order is significant. Options before this point require resolve_or_fail. |
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200 // Options after this point will use resolve_or_null instead. |
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201 |
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202 Opt, // preload tried; NULL if not present |
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203 Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection |
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204 Opt_Only_JDK15, // preload tried; use only with JDK1.5+ |
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205 Opt_Kernel, // preload tried only #ifdef KERNEL |
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206 OPTION_LIMIT, |
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207 CEIL_LG_OPTION_LIMIT = 4 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT) |
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208 }; |
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209 |
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210 |
0 | 211 // Returns a class with a given class name and class loader. Loads the |
212 // class if needed. If not found a NoClassDefFoundError or a | |
213 // ClassNotFoundException is thrown, depending on the value on the | |
214 // throw_error flag. For most uses the throw_error argument should be set | |
215 // to true. | |
216 | |
217 static klassOop resolve_or_fail(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS); | |
218 // Convenient call for null loader and protection domain. | |
219 static klassOop resolve_or_fail(symbolHandle class_name, bool throw_error, TRAPS); | |
220 private: | |
221 // handle error translation for resolve_or_null results | |
222 static klassOop handle_resolution_exception(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS); | |
223 | |
224 public: | |
225 | |
226 // Returns a class with a given class name and class loader. | |
227 // Loads the class if needed. If not found NULL is returned. | |
228 static klassOop resolve_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS); | |
229 // Version with null loader and protection domain | |
230 static klassOop resolve_or_null(symbolHandle class_name, TRAPS); | |
231 | |
232 // Resolve a superclass or superinterface. Called from ClassFileParser, | |
233 // parse_interfaces, resolve_instance_class_or_null, load_shared_class | |
234 // "child_name" is the class whose super class or interface is being resolved. | |
235 static klassOop resolve_super_or_fail(symbolHandle child_name, | |
236 symbolHandle class_name, | |
237 Handle class_loader, | |
238 Handle protection_domain, | |
239 bool is_superclass, | |
240 TRAPS); | |
241 | |
242 // Parse new stream. This won't update the system dictionary or | |
243 // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses. | |
244 static klassOop parse_stream(symbolHandle class_name, | |
245 Handle class_loader, | |
246 Handle protection_domain, | |
247 ClassFileStream* st, | |
431
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248 TRAPS) { |
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249 KlassHandle nullHandle; |
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250 return parse_stream(class_name, class_loader, protection_domain, st, nullHandle, NULL, THREAD); |
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251 } |
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252 static klassOop parse_stream(symbolHandle class_name, |
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253 Handle class_loader, |
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254 Handle protection_domain, |
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255 ClassFileStream* st, |
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256 KlassHandle host_klass, |
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257 GrowableArray<Handle>* cp_patches, |
0 | 258 TRAPS); |
259 | |
260 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass) | |
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261 static klassOop resolve_from_stream(symbolHandle class_name, Handle class_loader, |
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262 Handle protection_domain, |
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263 ClassFileStream* st, bool verify, TRAPS); |
0 | 264 |
265 // Lookup an already loaded class. If not found NULL is returned. | |
266 static klassOop find(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS); | |
267 | |
268 // Lookup an already loaded instance or array class. | |
269 // Do not make any queries to class loaders; consult only the cache. | |
270 // If not found NULL is returned. | |
271 static klassOop find_instance_or_array_klass(symbolHandle class_name, | |
272 Handle class_loader, | |
273 Handle protection_domain, | |
274 TRAPS); | |
275 | |
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276 // If the given name is known to vmSymbols, return the well-know klass: |
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277 static klassOop find_well_known_klass(symbolOop class_name); |
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278 |
0 | 279 // Lookup an instance or array class that has already been loaded |
280 // either into the given class loader, or else into another class | |
281 // loader that is constrained (via loader constraints) to produce | |
282 // a consistent class. Do not take protection domains into account. | |
283 // Do not make any queries to class loaders; consult only the cache. | |
284 // Return NULL if the class is not found. | |
285 // | |
286 // This function is a strict superset of find_instance_or_array_klass. | |
287 // This function (the unchecked version) makes a conservative prediction | |
288 // of the result of the checked version, assuming successful lookup. | |
289 // If both functions return non-null, they must return the same value. | |
290 // Also, the unchecked version may sometimes be non-null where the | |
291 // checked version is null. This can occur in several ways: | |
292 // 1. No query has yet been made to the class loader. | |
293 // 2. The class loader was queried, but chose not to delegate. | |
294 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain. | |
295 // 4. Loading was attempted, but there was a linkage error of some sort. | |
296 // In all of these cases, the loader constraints on this type are | |
297 // satisfied, and it is safe for classes in the given class loader | |
298 // to manipulate strongly-typed values of the found class, subject | |
299 // to local linkage and access checks. | |
300 static klassOop find_constrained_instance_or_array_klass(symbolHandle class_name, | |
301 Handle class_loader, | |
302 TRAPS); | |
303 | |
304 // Iterate over all klasses in dictionary | |
305 // Just the classes from defining class loaders | |
306 static void classes_do(void f(klassOop)); | |
307 // Added for initialize_itable_for_klass to handle exceptions | |
308 static void classes_do(void f(klassOop, TRAPS), TRAPS); | |
309 // All classes, and their class loaders | |
310 static void classes_do(void f(klassOop, oop)); | |
311 // All classes, and their class loaders | |
312 // (added for helpers that use HandleMarks and ResourceMarks) | |
313 static void classes_do(void f(klassOop, oop, TRAPS), TRAPS); | |
314 // All entries in the placeholder table and their class loaders | |
315 static void placeholders_do(void f(symbolOop, oop)); | |
316 | |
317 // Iterate over all methods in all klasses in dictionary | |
318 static void methods_do(void f(methodOop)); | |
319 | |
320 // Garbage collection support | |
321 | |
322 // This method applies "blk->do_oop" to all the pointers to "system" | |
323 // classes and loaders. | |
324 static void always_strong_oops_do(OopClosure* blk); | |
325 static void always_strong_classes_do(OopClosure* blk); | |
326 // This method applies "blk->do_oop" to all the placeholders. | |
327 static void placeholders_do(OopClosure* blk); | |
328 | |
329 // Unload (that is, break root links to) all unmarked classes and | |
330 // loaders. Returns "true" iff something was unloaded. | |
331 static bool do_unloading(BoolObjectClosure* is_alive); | |
332 | |
333 // Applies "f->do_oop" to all root oops in the system dictionary. | |
334 static void oops_do(OopClosure* f); | |
335 | |
336 // System loader lock | |
337 static oop system_loader_lock() { return _system_loader_lock_obj; } | |
338 | |
339 private: | |
340 // Traverses preloaded oops: various system classes. These are | |
341 // guaranteed to be in the perm gen. | |
342 static void preloaded_oops_do(OopClosure* f); | |
343 static void lazily_loaded_oops_do(OopClosure* f); | |
344 | |
345 public: | |
346 // Sharing support. | |
347 static void reorder_dictionary(); | |
348 static void copy_buckets(char** top, char* end); | |
349 static void copy_table(char** top, char* end); | |
350 static void reverse(); | |
351 static void set_shared_dictionary(HashtableBucket* t, int length, | |
352 int number_of_entries); | |
353 // Printing | |
354 static void print() PRODUCT_RETURN; | |
355 static void print_class_statistics() PRODUCT_RETURN; | |
356 static void print_method_statistics() PRODUCT_RETURN; | |
357 | |
358 // Number of contained klasses | |
359 // This is both fully loaded classes and classes in the process | |
360 // of being loaded | |
361 static int number_of_classes(); | |
362 | |
363 // Monotonically increasing counter which grows as classes are | |
364 // loaded or modifications such as hot-swapping or setting/removing | |
365 // of breakpoints are performed | |
366 static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; } | |
367 // Needed by evolution and breakpoint code | |
368 static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; } | |
369 | |
370 // Verification | |
371 static void verify(); | |
372 | |
373 #ifdef ASSERT | |
374 static bool is_internal_format(symbolHandle class_name); | |
375 #endif | |
376 | |
377 // Verify class is in dictionary | |
378 static void verify_obj_klass_present(Handle obj, | |
379 symbolHandle class_name, | |
380 Handle class_loader); | |
381 | |
382 // Initialization | |
383 static void initialize(TRAPS); | |
384 | |
385 // Fast access to commonly used classes (preloaded) | |
386 static klassOop check_klass(klassOop k) { | |
387 assert(k != NULL, "preloaded klass not initialized"); | |
388 return k; | |
389 } | |
390 | |
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391 static klassOop check_klass_Pre(klassOop k) { return check_klass(k); } |
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392 static klassOop check_klass_Opt(klassOop k) { return k; } |
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393 static klassOop check_klass_Opt_Kernel(klassOop k) { return k; } //== Opt |
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394 static klassOop check_klass_Opt_Only_JDK15(klassOop k) { |
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395 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only"); |
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396 return k; |
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397 } |
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398 static klassOop check_klass_Opt_Only_JDK14NewRef(klassOop k) { |
0 | 399 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only"); |
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400 // despite the optional loading, if you use this it must be present: |
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401 return check_klass(k); |
0 | 402 } |
403 | |
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404 static bool initialize_wk_klass(WKID id, int init_opt, TRAPS); |
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405 static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS); |
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406 static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) { |
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407 int limit = (int)end_id + 1; |
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408 initialize_wk_klasses_until((WKID) limit, start_id, THREAD); |
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409 } |
0 | 410 |
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411 public: |
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412 #define WK_KLASS_DECLARE(name, ignore_symbol, option) \ |
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413 static klassOop name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } |
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414 WK_KLASSES_DO(WK_KLASS_DECLARE); |
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415 #undef WK_KLASS_DECLARE |
0 | 416 |
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417 // Local definition for direct access to the private array: |
147 | 418 #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)] |
0 | 419 |
420 static klassOop box_klass(BasicType t) { | |
421 assert((uint)t < T_VOID+1, "range check"); | |
422 return check_klass(_box_klasses[t]); | |
423 } | |
424 static BasicType box_klass_type(klassOop k); // inverse of box_klass | |
425 | |
426 // methods returning lazily loaded klasses | |
427 // The corresponding method to load the class must be called before calling them. | |
428 static klassOop abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); } | |
429 | |
430 static void load_abstract_ownable_synchronizer_klass(TRAPS); | |
431 | |
432 private: | |
433 // Tells whether ClassLoader.loadClassInternal is present | |
434 static bool has_loadClassInternal() { return _has_loadClassInternal; } | |
435 | |
436 public: | |
437 // Tells whether ClassLoader.checkPackageAccess is present | |
438 static bool has_checkPackageAccess() { return _has_checkPackageAccess; } | |
439 | |
1142 | 440 static bool Class_klass_loaded() { return WK_KLASS(Class_klass) != NULL; } |
441 static bool Cloneable_klass_loaded() { return WK_KLASS(Cloneable_klass) != NULL; } | |
0 | 442 |
443 // Returns default system loader | |
444 static oop java_system_loader(); | |
445 | |
446 // Compute the default system loader | |
447 static void compute_java_system_loader(TRAPS); | |
448 | |
449 private: | |
450 // Mirrors for primitive classes (created eagerly) | |
451 static oop check_mirror(oop m) { | |
452 assert(m != NULL, "mirror not initialized"); | |
453 return m; | |
454 } | |
455 | |
456 public: | |
457 // Note: java_lang_Class::primitive_type is the inverse of java_mirror | |
458 | |
459 // Check class loader constraints | |
460 static bool add_loader_constraint(symbolHandle name, Handle loader1, | |
461 Handle loader2, TRAPS); | |
462 static char* check_signature_loaders(symbolHandle signature, Handle loader1, | |
463 Handle loader2, bool is_method, TRAPS); | |
464 | |
710 | 465 // JSR 292 |
466 // find the java.dyn.MethodHandles::invoke method for a given signature | |
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467 static methodOop find_method_handle_invoke(symbolHandle name, |
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468 symbolHandle signature, |
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469 KlassHandle accessing_klass, |
710 | 470 TRAPS); |
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471 // ask Java to compute a java.dyn.MethodType object for a given signature |
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472 static Handle find_method_handle_type(symbolHandle signature, |
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473 KlassHandle accessing_klass, |
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474 bool& return_bcp_flag, |
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475 TRAPS); |
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476 // ask Java to create a dynamic call site, while linking an invokedynamic op |
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477 static Handle make_dynamic_call_site(Handle bootstrap_method, |
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478 // Callee information: |
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479 symbolHandle name, |
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480 methodHandle signature_invoker, |
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481 Handle info, |
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482 // Caller information: |
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483 methodHandle caller_method, |
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484 int caller_bci, |
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485 TRAPS); |
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486 |
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487 // coordinate with Java about bootstrap methods |
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488 static Handle find_bootstrap_method(KlassHandle caller, TRAPS); |
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489 |
0 | 490 // Utility for printing loader "name" as part of tracing constraints |
491 static const char* loader_name(oop loader) { | |
492 return ((loader) == NULL ? "<bootloader>" : | |
493 instanceKlass::cast((loader)->klass())->name()->as_C_string() ); | |
494 } | |
495 | |
496 // Record the error when the first attempt to resolve a reference from a constant | |
497 // pool entry to a class fails. | |
498 static void add_resolution_error(constantPoolHandle pool, int which, symbolHandle error); | |
499 static symbolOop find_resolution_error(constantPoolHandle pool, int which); | |
500 | |
501 private: | |
502 | |
503 enum Constants { | |
504 _loader_constraint_size = 107, // number of entries in constraint table | |
505 _resolution_error_size = 107, // number of entries in resolution error table | |
710 | 506 _invoke_method_size = 139, // number of entries in invoke method table |
0 | 507 _nof_buckets = 1009 // number of buckets in hash table |
508 }; | |
509 | |
510 | |
511 // Static variables | |
512 | |
513 // Hashtable holding loaded classes. | |
514 static Dictionary* _dictionary; | |
515 | |
516 // Hashtable holding placeholders for classes being loaded. | |
517 static PlaceholderTable* _placeholders; | |
518 | |
519 // Hashtable holding classes from the shared archive. | |
520 static Dictionary* _shared_dictionary; | |
521 | |
522 // Monotonically increasing counter which grows with | |
523 // _number_of_classes as well as hot-swapping and breakpoint setting | |
524 // and removal. | |
525 static int _number_of_modifications; | |
526 | |
527 // Lock object for system class loader | |
528 static oop _system_loader_lock_obj; | |
529 | |
530 // Constraints on class loaders | |
531 static LoaderConstraintTable* _loader_constraints; | |
532 | |
533 // Resolution errors | |
534 static ResolutionErrorTable* _resolution_errors; | |
535 | |
710 | 536 // Invoke methods (JSR 292) |
537 static SymbolPropertyTable* _invoke_method_table; | |
538 | |
0 | 539 public: |
540 // for VM_CounterDecay iteration support | |
541 friend class CounterDecay; | |
542 static klassOop try_get_next_class(); | |
543 | |
544 private: | |
545 static void validate_protection_domain(instanceKlassHandle klass, | |
546 Handle class_loader, | |
547 Handle protection_domain, TRAPS); | |
548 | |
549 friend class VM_PopulateDumpSharedSpace; | |
550 friend class TraversePlaceholdersClosure; | |
551 static Dictionary* dictionary() { return _dictionary; } | |
552 static Dictionary* shared_dictionary() { return _shared_dictionary; } | |
553 static PlaceholderTable* placeholders() { return _placeholders; } | |
554 static LoaderConstraintTable* constraints() { return _loader_constraints; } | |
555 static ResolutionErrorTable* resolution_errors() { return _resolution_errors; } | |
710 | 556 static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; } |
0 | 557 |
558 // Basic loading operations | |
559 static klassOop resolve_instance_class_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS); | |
560 static klassOop resolve_array_class_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS); | |
561 static instanceKlassHandle handle_parallel_super_load(symbolHandle class_name, symbolHandle supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS); | |
562 // Wait on SystemDictionary_lock; unlocks lockObject before | |
563 // waiting; relocks lockObject with correct recursion count | |
564 // after waiting, but before reentering SystemDictionary_lock | |
565 // to preserve lock order semantics. | |
566 static void double_lock_wait(Handle lockObject, TRAPS); | |
567 static void define_instance_class(instanceKlassHandle k, TRAPS); | |
568 static instanceKlassHandle find_or_define_instance_class(symbolHandle class_name, | |
569 Handle class_loader, | |
570 instanceKlassHandle k, TRAPS); | |
571 static instanceKlassHandle load_shared_class(symbolHandle class_name, | |
572 Handle class_loader, TRAPS); | |
573 static instanceKlassHandle load_shared_class(instanceKlassHandle ik, | |
574 Handle class_loader, TRAPS); | |
575 static instanceKlassHandle load_instance_class(symbolHandle class_name, Handle class_loader, TRAPS); | |
576 static Handle compute_loader_lock_object(Handle class_loader, TRAPS); | |
577 static void check_loader_lock_contention(Handle loader_lock, TRAPS); | |
514 | 578 static bool is_parallelCapable(Handle class_loader); |
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579 static bool is_parallelDefine(Handle class_loader); |
0 | 580 |
581 static klassOop find_shared_class(symbolHandle class_name); | |
582 | |
583 // Setup link to hierarchy | |
584 static void add_to_hierarchy(instanceKlassHandle k, TRAPS); | |
585 | |
586 private: | |
587 // We pass in the hashtable index so we can calculate it outside of | |
588 // the SystemDictionary_lock. | |
589 | |
590 // Basic find on loaded classes | |
591 static klassOop find_class(int index, unsigned int hash, | |
592 symbolHandle name, Handle loader); | |
593 | |
594 // Basic find on classes in the midst of being loaded | |
595 static symbolOop find_placeholder(int index, unsigned int hash, | |
596 symbolHandle name, Handle loader); | |
597 | |
598 // Basic find operation of loaded classes and classes in the midst | |
599 // of loading; used for assertions and verification only. | |
600 static oop find_class_or_placeholder(symbolHandle class_name, | |
601 Handle class_loader); | |
602 | |
603 // Updating entry in dictionary | |
604 // Add a completely loaded class | |
605 static void add_klass(int index, symbolHandle class_name, | |
606 Handle class_loader, KlassHandle obj); | |
607 | |
608 // Add a placeholder for a class being loaded | |
609 static void add_placeholder(int index, | |
610 symbolHandle class_name, | |
611 Handle class_loader); | |
612 static void remove_placeholder(int index, | |
613 symbolHandle class_name, | |
614 Handle class_loader); | |
615 | |
616 // Performs cleanups after resolve_super_or_fail. This typically needs | |
617 // to be called on failure. | |
618 // Won't throw, but can block. | |
619 static void resolution_cleanups(symbolHandle class_name, | |
620 Handle class_loader, | |
621 TRAPS); | |
622 | |
623 // Initialization | |
624 static void initialize_preloaded_classes(TRAPS); | |
625 | |
626 // Class loader constraints | |
627 static void check_constraints(int index, unsigned int hash, | |
628 instanceKlassHandle k, Handle loader, | |
629 bool defining, TRAPS); | |
630 static void update_dictionary(int d_index, unsigned int d_hash, | |
631 int p_index, unsigned int p_hash, | |
632 instanceKlassHandle k, Handle loader, TRAPS); | |
633 | |
634 // Variables holding commonly used klasses (preloaded) | |
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635 static klassOop _well_known_klasses[]; |
0 | 636 |
637 // Lazily loaded klasses | |
638 static volatile klassOop _abstract_ownable_synchronizer_klass; | |
639 | |
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640 // table of box klasses (int_klass, etc.) |
0 | 641 static klassOop _box_klasses[T_VOID+1]; |
642 | |
643 static oop _java_system_loader; | |
644 | |
645 static bool _has_loadClassInternal; | |
646 static bool _has_checkPackageAccess; | |
647 }; | |
665
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648 |
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649 // Cf. vmSymbols vs. vmSymbolHandles |
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650 class SystemDictionaryHandles : AllStatic { |
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651 public: |
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652 #define WK_KLASS_HANDLE_DECLARE(name, ignore_symbol, option) \ |
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653 static KlassHandle name() { \ |
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654 SystemDictionary::name(); \ |
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655 klassOop* loc = &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \ |
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656 return KlassHandle(loc, true); \ |
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657 } |
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658 WK_KLASSES_DO(WK_KLASS_HANDLE_DECLARE); |
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659 #undef WK_KLASS_HANDLE_DECLARE |
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660 |
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661 static KlassHandle box_klass(BasicType t); |
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662 }; |