Mercurial > hg > truffle
annotate src/share/vm/classfile/systemDictionary.hpp @ 2044:06f017f7daa7
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author | Thomas Wuerthinger <wuerthinger@ssw.jku.at> |
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date | Fri, 07 Jan 2011 18:18:08 +0100 |
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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) \ | |
132
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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) \ | |
132
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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) \ | |
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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 \ |
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185 template(HotSpotTypeResolved_klass, com_sun_hotspot_c1x_HotSpotTypeResolved, Opt) \ |
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186 template(HotSpotField_klass, com_sun_hotspot_c1x_HotSpotField, Opt) \ |
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187 template(HotSpotMethodResolved_klass, com_sun_hotspot_c1x_HotSpotMethodResolved, Opt) \ |
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188 template(HotSpotTargetMethod_klass, com_sun_hotspot_c1x_HotSpotTargetMethod, Opt) \ |
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189 template(HotSpotExceptionHandler_klass,com_sun_hotspot_c1x_HotSpotExceptionHandler, Opt) \ |
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190 template(HotSpotProxy_klass, com_sun_hotspot_c1x_HotSpotProxy, Opt) \ |
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191 template(CiTargetMethod_klass, com_sun_cri_ci_CiTargetMethod, Opt) \ |
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192 template(CiTargetMethod_Site_klass, com_sun_cri_ci_CiTargetMethod_Site, Opt) \ |
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193 template(CiTargetMethod_Call_klass, com_sun_cri_ci_CiTargetMethod_Call, Opt) \ |
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194 template(CiTargetMethod_DataPatch_klass, com_sun_cri_ci_CiTargetMethod_DataPatch, Opt) \ |
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195 template(CiTargetMethod_Safepoint_klass, com_sun_cri_ci_CiTargetMethod_Safepoint, Opt) \ |
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196 template(CiTargetMethod_ExceptionHandler_klass, com_sun_cri_ci_CiTargetMethod_ExceptionHandler, Opt) \ |
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197 template(CiTargetMethod_Mark_klass, com_sun_cri_ci_CiTargetMethod_Mark, Opt) \ |
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198 template(CiBitMap_klass, com_sun_cri_ci_CiBitMap, Opt) \ |
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199 template(CiDebugInfo_klass, com_sun_cri_ci_CiDebugInfo, Opt) \ |
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200 template(CiDebugInfo_Frame_klass, com_sun_cri_ci_CiDebugInfo_Frame, Opt) \ |
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201 template(CiValue_klass, com_sun_cri_ci_CiValue, Opt) \ |
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202 template(CiStackSlot_klass, com_sun_cri_ci_CiStackSlot, Opt) \ |
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203 template(CiRegisterValue_klass, com_sun_cri_ci_CiRegisterValue, Opt) \ |
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204 template(CiRegister_klass, com_sun_cri_ci_CiRegister, Opt) \ |
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205 template(CiCodePos_klass, com_sun_cri_ci_CiCodePos, Opt) \ |
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206 template(CiConstant_klass, com_sun_cri_ci_CiConstant, Opt) \ |
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207 template(CiKind_klass, com_sun_cri_ci_CiKind, Opt) \ |
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208 template(CiRuntimeCall_klass, com_sun_cri_ci_CiRuntimeCall, Opt) \ |
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209 template(RiMethod_klass, com_sun_cri_ri_RiMethod, Opt) \ |
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210 template(RiExceptionHandler_klass, com_sun_cri_ri_RiExceptionHandler, Opt) \ |
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211 |
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212 /*end*/ |
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213 |
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214 |
0 | 215 class SystemDictionary : AllStatic { |
216 friend class VMStructs; | |
217 friend class CompactingPermGenGen; | |
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218 friend class SystemDictionaryHandles; |
0 | 219 NOT_PRODUCT(friend class instanceKlassKlass;) |
220 | |
221 public: | |
132
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222 enum WKID { |
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223 NO_WKID = 0, |
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224 |
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225 #define WK_KLASS_ENUM(name, ignore_s, ignore_o) WK_KLASS_ENUM_NAME(name), |
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226 WK_KLASSES_DO(WK_KLASS_ENUM) |
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227 #undef WK_KLASS_ENUM |
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228 |
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229 WKID_LIMIT, |
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230 |
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231 FIRST_WKID = NO_WKID + 1 |
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232 }; |
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233 |
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234 enum InitOption { |
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235 Pre, // preloaded; error if not present |
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236 |
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237 // Order is significant. Options before this point require resolve_or_fail. |
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238 // Options after this point will use resolve_or_null instead. |
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239 |
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240 Opt, // preload tried; NULL if not present |
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241 Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection |
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242 Opt_Only_JDK15, // preload tried; use only with JDK1.5+ |
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243 Opt_Kernel, // preload tried only #ifdef KERNEL |
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244 OPTION_LIMIT, |
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245 CEIL_LG_OPTION_LIMIT = 4 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT) |
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246 }; |
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247 |
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248 |
0 | 249 // Returns a class with a given class name and class loader. Loads the |
250 // class if needed. If not found a NoClassDefFoundError or a | |
251 // ClassNotFoundException is thrown, depending on the value on the | |
252 // throw_error flag. For most uses the throw_error argument should be set | |
253 // to true. | |
254 | |
255 static klassOop resolve_or_fail(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS); | |
256 // Convenient call for null loader and protection domain. | |
257 static klassOop resolve_or_fail(symbolHandle class_name, bool throw_error, TRAPS); | |
258 private: | |
259 // handle error translation for resolve_or_null results | |
260 static klassOop handle_resolution_exception(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS); | |
261 | |
262 public: | |
263 | |
264 // Returns a class with a given class name and class loader. | |
265 // Loads the class if needed. If not found NULL is returned. | |
266 static klassOop resolve_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS); | |
267 // Version with null loader and protection domain | |
268 static klassOop resolve_or_null(symbolHandle class_name, TRAPS); | |
269 | |
270 // Resolve a superclass or superinterface. Called from ClassFileParser, | |
271 // parse_interfaces, resolve_instance_class_or_null, load_shared_class | |
272 // "child_name" is the class whose super class or interface is being resolved. | |
273 static klassOop resolve_super_or_fail(symbolHandle child_name, | |
274 symbolHandle class_name, | |
275 Handle class_loader, | |
276 Handle protection_domain, | |
277 bool is_superclass, | |
278 TRAPS); | |
279 | |
280 // Parse new stream. This won't update the system dictionary or | |
281 // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses. | |
282 static klassOop parse_stream(symbolHandle class_name, | |
283 Handle class_loader, | |
284 Handle protection_domain, | |
285 ClassFileStream* st, | |
431
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286 TRAPS) { |
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287 KlassHandle nullHandle; |
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288 return parse_stream(class_name, class_loader, protection_domain, st, nullHandle, NULL, THREAD); |
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289 } |
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290 static klassOop parse_stream(symbolHandle class_name, |
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291 Handle class_loader, |
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292 Handle protection_domain, |
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293 ClassFileStream* st, |
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294 KlassHandle host_klass, |
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295 GrowableArray<Handle>* cp_patches, |
0 | 296 TRAPS); |
297 | |
298 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass) | |
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299 static klassOop resolve_from_stream(symbolHandle class_name, Handle class_loader, |
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300 Handle protection_domain, |
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301 ClassFileStream* st, bool verify, TRAPS); |
0 | 302 |
303 // Lookup an already loaded class. If not found NULL is returned. | |
304 static klassOop find(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS); | |
305 | |
306 // Lookup an already loaded instance or array class. | |
307 // Do not make any queries to class loaders; consult only the cache. | |
308 // If not found NULL is returned. | |
309 static klassOop find_instance_or_array_klass(symbolHandle class_name, | |
310 Handle class_loader, | |
311 Handle protection_domain, | |
312 TRAPS); | |
313 | |
132
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314 // If the given name is known to vmSymbols, return the well-know klass: |
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315 static klassOop find_well_known_klass(symbolOop class_name); |
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316 |
0 | 317 // Lookup an instance or array class that has already been loaded |
318 // either into the given class loader, or else into another class | |
319 // loader that is constrained (via loader constraints) to produce | |
320 // a consistent class. Do not take protection domains into account. | |
321 // Do not make any queries to class loaders; consult only the cache. | |
322 // Return NULL if the class is not found. | |
323 // | |
324 // This function is a strict superset of find_instance_or_array_klass. | |
325 // This function (the unchecked version) makes a conservative prediction | |
326 // of the result of the checked version, assuming successful lookup. | |
327 // If both functions return non-null, they must return the same value. | |
328 // Also, the unchecked version may sometimes be non-null where the | |
329 // checked version is null. This can occur in several ways: | |
330 // 1. No query has yet been made to the class loader. | |
331 // 2. The class loader was queried, but chose not to delegate. | |
332 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain. | |
333 // 4. Loading was attempted, but there was a linkage error of some sort. | |
334 // In all of these cases, the loader constraints on this type are | |
335 // satisfied, and it is safe for classes in the given class loader | |
336 // to manipulate strongly-typed values of the found class, subject | |
337 // to local linkage and access checks. | |
338 static klassOop find_constrained_instance_or_array_klass(symbolHandle class_name, | |
339 Handle class_loader, | |
340 TRAPS); | |
341 | |
342 // Iterate over all klasses in dictionary | |
343 // Just the classes from defining class loaders | |
344 static void classes_do(void f(klassOop)); | |
345 // Added for initialize_itable_for_klass to handle exceptions | |
346 static void classes_do(void f(klassOop, TRAPS), TRAPS); | |
347 // All classes, and their class loaders | |
348 static void classes_do(void f(klassOop, oop)); | |
349 // All classes, and their class loaders | |
350 // (added for helpers that use HandleMarks and ResourceMarks) | |
351 static void classes_do(void f(klassOop, oop, TRAPS), TRAPS); | |
352 // All entries in the placeholder table and their class loaders | |
353 static void placeholders_do(void f(symbolOop, oop)); | |
354 | |
355 // Iterate over all methods in all klasses in dictionary | |
356 static void methods_do(void f(methodOop)); | |
357 | |
358 // Garbage collection support | |
359 | |
360 // This method applies "blk->do_oop" to all the pointers to "system" | |
361 // classes and loaders. | |
362 static void always_strong_oops_do(OopClosure* blk); | |
363 static void always_strong_classes_do(OopClosure* blk); | |
364 // This method applies "blk->do_oop" to all the placeholders. | |
365 static void placeholders_do(OopClosure* blk); | |
366 | |
367 // Unload (that is, break root links to) all unmarked classes and | |
368 // loaders. Returns "true" iff something was unloaded. | |
369 static bool do_unloading(BoolObjectClosure* is_alive); | |
370 | |
371 // Applies "f->do_oop" to all root oops in the system dictionary. | |
372 static void oops_do(OopClosure* f); | |
373 | |
374 // System loader lock | |
375 static oop system_loader_lock() { return _system_loader_lock_obj; } | |
376 | |
377 private: | |
378 // Traverses preloaded oops: various system classes. These are | |
379 // guaranteed to be in the perm gen. | |
380 static void preloaded_oops_do(OopClosure* f); | |
381 static void lazily_loaded_oops_do(OopClosure* f); | |
382 | |
383 public: | |
384 // Sharing support. | |
385 static void reorder_dictionary(); | |
386 static void copy_buckets(char** top, char* end); | |
387 static void copy_table(char** top, char* end); | |
388 static void reverse(); | |
389 static void set_shared_dictionary(HashtableBucket* t, int length, | |
390 int number_of_entries); | |
391 // Printing | |
392 static void print() PRODUCT_RETURN; | |
393 static void print_class_statistics() PRODUCT_RETURN; | |
394 static void print_method_statistics() PRODUCT_RETURN; | |
395 | |
396 // Number of contained klasses | |
397 // This is both fully loaded classes and classes in the process | |
398 // of being loaded | |
399 static int number_of_classes(); | |
400 | |
401 // Monotonically increasing counter which grows as classes are | |
402 // loaded or modifications such as hot-swapping or setting/removing | |
403 // of breakpoints are performed | |
404 static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; } | |
405 // Needed by evolution and breakpoint code | |
406 static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; } | |
407 | |
408 // Verification | |
409 static void verify(); | |
410 | |
411 #ifdef ASSERT | |
412 static bool is_internal_format(symbolHandle class_name); | |
413 #endif | |
414 | |
415 // Verify class is in dictionary | |
416 static void verify_obj_klass_present(Handle obj, | |
417 symbolHandle class_name, | |
418 Handle class_loader); | |
419 | |
420 // Initialization | |
421 static void initialize(TRAPS); | |
422 | |
423 // Fast access to commonly used classes (preloaded) | |
424 static klassOop check_klass(klassOop k) { | |
425 assert(k != NULL, "preloaded klass not initialized"); | |
426 return k; | |
427 } | |
428 | |
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429 static klassOop check_klass_Pre(klassOop k) { return check_klass(k); } |
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430 static klassOop check_klass_Opt(klassOop k) { return k; } |
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431 static klassOop check_klass_Opt_Kernel(klassOop k) { return k; } //== Opt |
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432 static klassOop check_klass_Opt_Only_JDK15(klassOop k) { |
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433 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only"); |
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434 return k; |
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435 } |
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436 static klassOop check_klass_Opt_Only_JDK14NewRef(klassOop k) { |
0 | 437 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only"); |
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438 // despite the optional loading, if you use this it must be present: |
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439 return check_klass(k); |
0 | 440 } |
441 | |
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442 static bool initialize_wk_klass(WKID id, int init_opt, TRAPS); |
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443 static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS); |
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444 static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) { |
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445 int limit = (int)end_id + 1; |
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446 initialize_wk_klasses_until((WKID) limit, start_id, THREAD); |
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447 } |
0 | 448 |
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449 public: |
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450 #define WK_KLASS_DECLARE(name, ignore_symbol, option) \ |
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451 static klassOop name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } |
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452 WK_KLASSES_DO(WK_KLASS_DECLARE); |
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453 #undef WK_KLASS_DECLARE |
0 | 454 |
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455 // Local definition for direct access to the private array: |
147 | 456 #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)] |
0 | 457 |
458 static klassOop box_klass(BasicType t) { | |
459 assert((uint)t < T_VOID+1, "range check"); | |
460 return check_klass(_box_klasses[t]); | |
461 } | |
462 static BasicType box_klass_type(klassOop k); // inverse of box_klass | |
463 | |
464 // methods returning lazily loaded klasses | |
465 // The corresponding method to load the class must be called before calling them. | |
466 static klassOop abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); } | |
467 | |
468 static void load_abstract_ownable_synchronizer_klass(TRAPS); | |
469 | |
470 private: | |
471 // Tells whether ClassLoader.loadClassInternal is present | |
472 static bool has_loadClassInternal() { return _has_loadClassInternal; } | |
473 | |
474 public: | |
475 // Tells whether ClassLoader.checkPackageAccess is present | |
476 static bool has_checkPackageAccess() { return _has_checkPackageAccess; } | |
477 | |
1142 | 478 static bool Class_klass_loaded() { return WK_KLASS(Class_klass) != NULL; } |
479 static bool Cloneable_klass_loaded() { return WK_KLASS(Cloneable_klass) != NULL; } | |
0 | 480 |
481 // Returns default system loader | |
482 static oop java_system_loader(); | |
483 | |
484 // Compute the default system loader | |
485 static void compute_java_system_loader(TRAPS); | |
486 | |
487 private: | |
488 // Mirrors for primitive classes (created eagerly) | |
489 static oop check_mirror(oop m) { | |
490 assert(m != NULL, "mirror not initialized"); | |
491 return m; | |
492 } | |
493 | |
494 public: | |
495 // Note: java_lang_Class::primitive_type is the inverse of java_mirror | |
496 | |
497 // Check class loader constraints | |
498 static bool add_loader_constraint(symbolHandle name, Handle loader1, | |
499 Handle loader2, TRAPS); | |
500 static char* check_signature_loaders(symbolHandle signature, Handle loader1, | |
501 Handle loader2, bool is_method, TRAPS); | |
502 | |
710 | 503 // JSR 292 |
504 // find the java.dyn.MethodHandles::invoke method for a given signature | |
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505 static methodOop find_method_handle_invoke(symbolHandle name, |
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506 symbolHandle signature, |
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507 KlassHandle accessing_klass, |
710 | 508 TRAPS); |
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509 // ask Java to compute a java.dyn.MethodType object for a given signature |
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510 static Handle find_method_handle_type(symbolHandle signature, |
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511 KlassHandle accessing_klass, |
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512 bool for_invokeGeneric, |
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513 bool& return_bcp_flag, |
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514 TRAPS); |
1602 | 515 // ask Java to compute a java.dyn.MethodHandle object for a given CP entry |
516 static Handle link_method_handle_constant(KlassHandle caller, | |
517 int ref_kind, //e.g., JVM_REF_invokeVirtual | |
518 KlassHandle callee, | |
519 symbolHandle name, | |
520 symbolHandle signature, | |
521 TRAPS); | |
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522 // ask Java to create a dynamic call site, while linking an invokedynamic op |
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523 static Handle make_dynamic_call_site(Handle bootstrap_method, |
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524 // Callee information: |
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525 symbolHandle name, |
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526 methodHandle signature_invoker, |
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527 Handle info, |
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528 // Caller information: |
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529 methodHandle caller_method, |
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530 int caller_bci, |
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531 TRAPS); |
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532 |
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533 // coordinate with Java about bootstrap methods |
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534 static Handle find_bootstrap_method(methodHandle caller_method, |
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535 int caller_bci, // N.B. must be an invokedynamic |
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536 int cache_index, // must be corresponding main_entry |
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537 Handle &argument_info_result, // static BSM arguments, if any |
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538 TRAPS); |
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539 |
0 | 540 // Utility for printing loader "name" as part of tracing constraints |
541 static const char* loader_name(oop loader) { | |
542 return ((loader) == NULL ? "<bootloader>" : | |
543 instanceKlass::cast((loader)->klass())->name()->as_C_string() ); | |
544 } | |
545 | |
546 // Record the error when the first attempt to resolve a reference from a constant | |
547 // pool entry to a class fails. | |
548 static void add_resolution_error(constantPoolHandle pool, int which, symbolHandle error); | |
549 static symbolOop find_resolution_error(constantPoolHandle pool, int which); | |
550 | |
551 private: | |
552 | |
553 enum Constants { | |
554 _loader_constraint_size = 107, // number of entries in constraint table | |
555 _resolution_error_size = 107, // number of entries in resolution error table | |
710 | 556 _invoke_method_size = 139, // number of entries in invoke method table |
0 | 557 _nof_buckets = 1009 // number of buckets in hash table |
558 }; | |
559 | |
560 | |
561 // Static variables | |
562 | |
563 // Hashtable holding loaded classes. | |
564 static Dictionary* _dictionary; | |
565 | |
566 // Hashtable holding placeholders for classes being loaded. | |
567 static PlaceholderTable* _placeholders; | |
568 | |
569 // Hashtable holding classes from the shared archive. | |
570 static Dictionary* _shared_dictionary; | |
571 | |
572 // Monotonically increasing counter which grows with | |
573 // _number_of_classes as well as hot-swapping and breakpoint setting | |
574 // and removal. | |
575 static int _number_of_modifications; | |
576 | |
577 // Lock object for system class loader | |
578 static oop _system_loader_lock_obj; | |
579 | |
580 // Constraints on class loaders | |
581 static LoaderConstraintTable* _loader_constraints; | |
582 | |
583 // Resolution errors | |
584 static ResolutionErrorTable* _resolution_errors; | |
585 | |
710 | 586 // Invoke methods (JSR 292) |
587 static SymbolPropertyTable* _invoke_method_table; | |
588 | |
0 | 589 public: |
590 // for VM_CounterDecay iteration support | |
591 friend class CounterDecay; | |
592 static klassOop try_get_next_class(); | |
593 | |
594 private: | |
595 static void validate_protection_domain(instanceKlassHandle klass, | |
596 Handle class_loader, | |
597 Handle protection_domain, TRAPS); | |
598 | |
599 friend class VM_PopulateDumpSharedSpace; | |
600 friend class TraversePlaceholdersClosure; | |
601 static Dictionary* dictionary() { return _dictionary; } | |
602 static Dictionary* shared_dictionary() { return _shared_dictionary; } | |
603 static PlaceholderTable* placeholders() { return _placeholders; } | |
604 static LoaderConstraintTable* constraints() { return _loader_constraints; } | |
605 static ResolutionErrorTable* resolution_errors() { return _resolution_errors; } | |
710 | 606 static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; } |
0 | 607 |
608 // Basic loading operations | |
609 static klassOop resolve_instance_class_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS); | |
610 static klassOop resolve_array_class_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS); | |
611 static instanceKlassHandle handle_parallel_super_load(symbolHandle class_name, symbolHandle supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS); | |
612 // Wait on SystemDictionary_lock; unlocks lockObject before | |
613 // waiting; relocks lockObject with correct recursion count | |
614 // after waiting, but before reentering SystemDictionary_lock | |
615 // to preserve lock order semantics. | |
616 static void double_lock_wait(Handle lockObject, TRAPS); | |
617 static void define_instance_class(instanceKlassHandle k, TRAPS); | |
618 static instanceKlassHandle find_or_define_instance_class(symbolHandle class_name, | |
619 Handle class_loader, | |
620 instanceKlassHandle k, TRAPS); | |
621 static instanceKlassHandle load_shared_class(symbolHandle class_name, | |
622 Handle class_loader, TRAPS); | |
623 static instanceKlassHandle load_shared_class(instanceKlassHandle ik, | |
624 Handle class_loader, TRAPS); | |
625 static instanceKlassHandle load_instance_class(symbolHandle class_name, Handle class_loader, TRAPS); | |
626 static Handle compute_loader_lock_object(Handle class_loader, TRAPS); | |
627 static void check_loader_lock_contention(Handle loader_lock, TRAPS); | |
514 | 628 static bool is_parallelCapable(Handle class_loader); |
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629 static bool is_parallelDefine(Handle class_loader); |
0 | 630 |
631 static klassOop find_shared_class(symbolHandle class_name); | |
632 | |
633 // Setup link to hierarchy | |
634 static void add_to_hierarchy(instanceKlassHandle k, TRAPS); | |
635 | |
636 private: | |
637 // We pass in the hashtable index so we can calculate it outside of | |
638 // the SystemDictionary_lock. | |
639 | |
640 // Basic find on loaded classes | |
641 static klassOop find_class(int index, unsigned int hash, | |
642 symbolHandle name, Handle loader); | |
643 | |
644 // Basic find on classes in the midst of being loaded | |
645 static symbolOop find_placeholder(int index, unsigned int hash, | |
646 symbolHandle name, Handle loader); | |
647 | |
648 // Basic find operation of loaded classes and classes in the midst | |
649 // of loading; used for assertions and verification only. | |
650 static oop find_class_or_placeholder(symbolHandle class_name, | |
651 Handle class_loader); | |
652 | |
653 // Updating entry in dictionary | |
654 // Add a completely loaded class | |
655 static void add_klass(int index, symbolHandle class_name, | |
656 Handle class_loader, KlassHandle obj); | |
657 | |
658 // Add a placeholder for a class being loaded | |
659 static void add_placeholder(int index, | |
660 symbolHandle class_name, | |
661 Handle class_loader); | |
662 static void remove_placeholder(int index, | |
663 symbolHandle class_name, | |
664 Handle class_loader); | |
665 | |
666 // Performs cleanups after resolve_super_or_fail. This typically needs | |
667 // to be called on failure. | |
668 // Won't throw, but can block. | |
669 static void resolution_cleanups(symbolHandle class_name, | |
670 Handle class_loader, | |
671 TRAPS); | |
672 | |
673 // Initialization | |
674 static void initialize_preloaded_classes(TRAPS); | |
675 | |
676 // Class loader constraints | |
677 static void check_constraints(int index, unsigned int hash, | |
678 instanceKlassHandle k, Handle loader, | |
679 bool defining, TRAPS); | |
680 static void update_dictionary(int d_index, unsigned int d_hash, | |
681 int p_index, unsigned int p_hash, | |
682 instanceKlassHandle k, Handle loader, TRAPS); | |
683 | |
684 // Variables holding commonly used klasses (preloaded) | |
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685 static klassOop _well_known_klasses[]; |
0 | 686 |
687 // Lazily loaded klasses | |
688 static volatile klassOop _abstract_ownable_synchronizer_klass; | |
689 | |
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690 // table of box klasses (int_klass, etc.) |
0 | 691 static klassOop _box_klasses[T_VOID+1]; |
692 | |
693 static oop _java_system_loader; | |
694 | |
695 static bool _has_loadClassInternal; | |
696 static bool _has_checkPackageAccess; | |
697 }; | |
665
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698 |
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699 // Cf. vmSymbols vs. vmSymbolHandles |
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700 class SystemDictionaryHandles : AllStatic { |
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701 public: |
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702 #define WK_KLASS_HANDLE_DECLARE(name, ignore_symbol, option) \ |
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703 static KlassHandle name() { \ |
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704 SystemDictionary::name(); \ |
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705 klassOop* loc = &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \ |
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706 return KlassHandle(loc, true); \ |
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707 } |
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708 WK_KLASSES_DO(WK_KLASS_HANDLE_DECLARE); |
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709 #undef WK_KLASS_HANDLE_DECLARE |
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710 |
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711 static KlassHandle box_klass(BasicType t); |
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712 }; |
1972 | 713 |
714 #endif // SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP |