Mercurial > hg > truffle
annotate src/share/vm/classfile/systemDictionary.hpp @ 1930:2d26b0046e0d
Merge.
author | Thomas Wuerthinger <wuerthinger@ssw.jku.at> |
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date | Tue, 30 Nov 2010 14:53:30 +0100 |
parents | 6b7001391c97 3b2dea75431e |
children | 06f017f7daa7 |
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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 | |
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) \ | |
132
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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 \ |
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175 template(HotSpotTypeResolved_klass, com_sun_hotspot_c1x_HotSpotTypeResolved, Opt) \ |
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176 template(HotSpotField_klass, com_sun_hotspot_c1x_HotSpotField, Opt) \ |
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177 template(HotSpotMethodResolved_klass, com_sun_hotspot_c1x_HotSpotMethodResolved, Opt) \ |
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178 template(HotSpotTargetMethod_klass, com_sun_hotspot_c1x_HotSpotTargetMethod, Opt) \ |
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179 template(HotSpotExceptionHandler_klass,com_sun_hotspot_c1x_HotSpotExceptionHandler, Opt) \ |
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180 template(HotSpotProxy_klass, com_sun_hotspot_c1x_HotSpotProxy, Opt) \ |
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181 template(CiTargetMethod_klass, com_sun_cri_ci_CiTargetMethod, Opt) \ |
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182 template(CiTargetMethod_Site_klass, com_sun_cri_ci_CiTargetMethod_Site, Opt) \ |
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183 template(CiTargetMethod_Call_klass, com_sun_cri_ci_CiTargetMethod_Call, Opt) \ |
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184 template(CiTargetMethod_DataPatch_klass, com_sun_cri_ci_CiTargetMethod_DataPatch, Opt) \ |
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185 template(CiTargetMethod_Safepoint_klass, com_sun_cri_ci_CiTargetMethod_Safepoint, Opt) \ |
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186 template(CiTargetMethod_ExceptionHandler_klass, com_sun_cri_ci_CiTargetMethod_ExceptionHandler, Opt) \ |
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187 template(CiTargetMethod_Mark_klass, com_sun_cri_ci_CiTargetMethod_Mark, Opt) \ |
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188 template(CiBitMap_klass, com_sun_cri_ci_CiBitMap, Opt) \ |
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189 template(CiDebugInfo_klass, com_sun_cri_ci_CiDebugInfo, Opt) \ |
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190 template(CiDebugInfo_Frame_klass, com_sun_cri_ci_CiDebugInfo_Frame, Opt) \ |
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191 template(CiValue_klass, com_sun_cri_ci_CiValue, Opt) \ |
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192 template(CiStackSlot_klass, com_sun_cri_ci_CiStackSlot, Opt) \ |
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193 template(CiRegisterValue_klass, com_sun_cri_ci_CiRegisterValue, Opt) \ |
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194 template(CiRegister_klass, com_sun_cri_ci_CiRegister, Opt) \ |
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195 template(CiCodePos_klass, com_sun_cri_ci_CiCodePos, Opt) \ |
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196 template(CiConstant_klass, com_sun_cri_ci_CiConstant, Opt) \ |
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197 template(CiKind_klass, com_sun_cri_ci_CiKind, Opt) \ |
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198 template(CiRuntimeCall_klass, com_sun_cri_ci_CiRuntimeCall, Opt) \ |
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199 template(RiMethod_klass, com_sun_cri_ri_RiMethod, Opt) \ |
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200 template(RiExceptionHandler_klass, com_sun_cri_ri_RiExceptionHandler, Opt) \ |
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201 |
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202 /*end*/ |
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203 |
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204 |
0 | 205 class SystemDictionary : AllStatic { |
206 friend class VMStructs; | |
207 friend class CompactingPermGenGen; | |
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208 friend class SystemDictionaryHandles; |
0 | 209 NOT_PRODUCT(friend class instanceKlassKlass;) |
210 | |
211 public: | |
132
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212 enum WKID { |
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213 NO_WKID = 0, |
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214 |
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215 #define WK_KLASS_ENUM(name, ignore_s, ignore_o) WK_KLASS_ENUM_NAME(name), |
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216 WK_KLASSES_DO(WK_KLASS_ENUM) |
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217 #undef WK_KLASS_ENUM |
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218 |
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219 WKID_LIMIT, |
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220 |
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221 FIRST_WKID = NO_WKID + 1 |
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222 }; |
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223 |
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224 enum InitOption { |
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225 Pre, // preloaded; error if not present |
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226 |
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227 // Order is significant. Options before this point require resolve_or_fail. |
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228 // Options after this point will use resolve_or_null instead. |
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229 |
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230 Opt, // preload tried; NULL if not present |
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231 Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection |
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232 Opt_Only_JDK15, // preload tried; use only with JDK1.5+ |
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233 Opt_Kernel, // preload tried only #ifdef KERNEL |
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234 OPTION_LIMIT, |
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235 CEIL_LG_OPTION_LIMIT = 4 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT) |
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236 }; |
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237 |
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238 |
0 | 239 // Returns a class with a given class name and class loader. Loads the |
240 // class if needed. If not found a NoClassDefFoundError or a | |
241 // ClassNotFoundException is thrown, depending on the value on the | |
242 // throw_error flag. For most uses the throw_error argument should be set | |
243 // to true. | |
244 | |
245 static klassOop resolve_or_fail(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS); | |
246 // Convenient call for null loader and protection domain. | |
247 static klassOop resolve_or_fail(symbolHandle class_name, bool throw_error, TRAPS); | |
248 private: | |
249 // handle error translation for resolve_or_null results | |
250 static klassOop handle_resolution_exception(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS); | |
251 | |
252 public: | |
253 | |
254 // Returns a class with a given class name and class loader. | |
255 // Loads the class if needed. If not found NULL is returned. | |
256 static klassOop resolve_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS); | |
257 // Version with null loader and protection domain | |
258 static klassOop resolve_or_null(symbolHandle class_name, TRAPS); | |
259 | |
260 // Resolve a superclass or superinterface. Called from ClassFileParser, | |
261 // parse_interfaces, resolve_instance_class_or_null, load_shared_class | |
262 // "child_name" is the class whose super class or interface is being resolved. | |
263 static klassOop resolve_super_or_fail(symbolHandle child_name, | |
264 symbolHandle class_name, | |
265 Handle class_loader, | |
266 Handle protection_domain, | |
267 bool is_superclass, | |
268 TRAPS); | |
269 | |
270 // Parse new stream. This won't update the system dictionary or | |
271 // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses. | |
272 static klassOop parse_stream(symbolHandle class_name, | |
273 Handle class_loader, | |
274 Handle protection_domain, | |
275 ClassFileStream* st, | |
431
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276 TRAPS) { |
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277 KlassHandle nullHandle; |
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278 return parse_stream(class_name, class_loader, protection_domain, st, nullHandle, NULL, THREAD); |
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279 } |
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280 static klassOop parse_stream(symbolHandle class_name, |
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281 Handle class_loader, |
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282 Handle protection_domain, |
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283 ClassFileStream* st, |
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284 KlassHandle host_klass, |
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285 GrowableArray<Handle>* cp_patches, |
0 | 286 TRAPS); |
287 | |
288 // Resolve from stream (called by jni_DefineClass and JVM_DefineClass) | |
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289 static klassOop resolve_from_stream(symbolHandle class_name, Handle class_loader, |
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290 Handle protection_domain, |
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291 ClassFileStream* st, bool verify, TRAPS); |
0 | 292 |
293 // Lookup an already loaded class. If not found NULL is returned. | |
294 static klassOop find(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS); | |
295 | |
296 // Lookup an already loaded instance or array class. | |
297 // Do not make any queries to class loaders; consult only the cache. | |
298 // If not found NULL is returned. | |
299 static klassOop find_instance_or_array_klass(symbolHandle class_name, | |
300 Handle class_loader, | |
301 Handle protection_domain, | |
302 TRAPS); | |
303 | |
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304 // If the given name is known to vmSymbols, return the well-know klass: |
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305 static klassOop find_well_known_klass(symbolOop class_name); |
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306 |
0 | 307 // Lookup an instance or array class that has already been loaded |
308 // either into the given class loader, or else into another class | |
309 // loader that is constrained (via loader constraints) to produce | |
310 // a consistent class. Do not take protection domains into account. | |
311 // Do not make any queries to class loaders; consult only the cache. | |
312 // Return NULL if the class is not found. | |
313 // | |
314 // This function is a strict superset of find_instance_or_array_klass. | |
315 // This function (the unchecked version) makes a conservative prediction | |
316 // of the result of the checked version, assuming successful lookup. | |
317 // If both functions return non-null, they must return the same value. | |
318 // Also, the unchecked version may sometimes be non-null where the | |
319 // checked version is null. This can occur in several ways: | |
320 // 1. No query has yet been made to the class loader. | |
321 // 2. The class loader was queried, but chose not to delegate. | |
322 // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain. | |
323 // 4. Loading was attempted, but there was a linkage error of some sort. | |
324 // In all of these cases, the loader constraints on this type are | |
325 // satisfied, and it is safe for classes in the given class loader | |
326 // to manipulate strongly-typed values of the found class, subject | |
327 // to local linkage and access checks. | |
328 static klassOop find_constrained_instance_or_array_klass(symbolHandle class_name, | |
329 Handle class_loader, | |
330 TRAPS); | |
331 | |
332 // Iterate over all klasses in dictionary | |
333 // Just the classes from defining class loaders | |
334 static void classes_do(void f(klassOop)); | |
335 // Added for initialize_itable_for_klass to handle exceptions | |
336 static void classes_do(void f(klassOop, TRAPS), TRAPS); | |
337 // All classes, and their class loaders | |
338 static void classes_do(void f(klassOop, oop)); | |
339 // All classes, and their class loaders | |
340 // (added for helpers that use HandleMarks and ResourceMarks) | |
341 static void classes_do(void f(klassOop, oop, TRAPS), TRAPS); | |
342 // All entries in the placeholder table and their class loaders | |
343 static void placeholders_do(void f(symbolOop, oop)); | |
344 | |
345 // Iterate over all methods in all klasses in dictionary | |
346 static void methods_do(void f(methodOop)); | |
347 | |
348 // Garbage collection support | |
349 | |
350 // This method applies "blk->do_oop" to all the pointers to "system" | |
351 // classes and loaders. | |
352 static void always_strong_oops_do(OopClosure* blk); | |
353 static void always_strong_classes_do(OopClosure* blk); | |
354 // This method applies "blk->do_oop" to all the placeholders. | |
355 static void placeholders_do(OopClosure* blk); | |
356 | |
357 // Unload (that is, break root links to) all unmarked classes and | |
358 // loaders. Returns "true" iff something was unloaded. | |
359 static bool do_unloading(BoolObjectClosure* is_alive); | |
360 | |
361 // Applies "f->do_oop" to all root oops in the system dictionary. | |
362 static void oops_do(OopClosure* f); | |
363 | |
364 // System loader lock | |
365 static oop system_loader_lock() { return _system_loader_lock_obj; } | |
366 | |
367 private: | |
368 // Traverses preloaded oops: various system classes. These are | |
369 // guaranteed to be in the perm gen. | |
370 static void preloaded_oops_do(OopClosure* f); | |
371 static void lazily_loaded_oops_do(OopClosure* f); | |
372 | |
373 public: | |
374 // Sharing support. | |
375 static void reorder_dictionary(); | |
376 static void copy_buckets(char** top, char* end); | |
377 static void copy_table(char** top, char* end); | |
378 static void reverse(); | |
379 static void set_shared_dictionary(HashtableBucket* t, int length, | |
380 int number_of_entries); | |
381 // Printing | |
382 static void print() PRODUCT_RETURN; | |
383 static void print_class_statistics() PRODUCT_RETURN; | |
384 static void print_method_statistics() PRODUCT_RETURN; | |
385 | |
386 // Number of contained klasses | |
387 // This is both fully loaded classes and classes in the process | |
388 // of being loaded | |
389 static int number_of_classes(); | |
390 | |
391 // Monotonically increasing counter which grows as classes are | |
392 // loaded or modifications such as hot-swapping or setting/removing | |
393 // of breakpoints are performed | |
394 static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; } | |
395 // Needed by evolution and breakpoint code | |
396 static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; } | |
397 | |
398 // Verification | |
399 static void verify(); | |
400 | |
401 #ifdef ASSERT | |
402 static bool is_internal_format(symbolHandle class_name); | |
403 #endif | |
404 | |
405 // Verify class is in dictionary | |
406 static void verify_obj_klass_present(Handle obj, | |
407 symbolHandle class_name, | |
408 Handle class_loader); | |
409 | |
410 // Initialization | |
411 static void initialize(TRAPS); | |
412 | |
413 // Fast access to commonly used classes (preloaded) | |
414 static klassOop check_klass(klassOop k) { | |
415 assert(k != NULL, "preloaded klass not initialized"); | |
416 return k; | |
417 } | |
418 | |
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419 static klassOop check_klass_Pre(klassOop k) { return check_klass(k); } |
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420 static klassOop check_klass_Opt(klassOop k) { return k; } |
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421 static klassOop check_klass_Opt_Kernel(klassOop k) { return k; } //== Opt |
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422 static klassOop check_klass_Opt_Only_JDK15(klassOop k) { |
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423 assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only"); |
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424 return k; |
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425 } |
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426 static klassOop check_klass_Opt_Only_JDK14NewRef(klassOop k) { |
0 | 427 assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only"); |
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428 // despite the optional loading, if you use this it must be present: |
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429 return check_klass(k); |
0 | 430 } |
431 | |
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432 static bool initialize_wk_klass(WKID id, int init_opt, TRAPS); |
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433 static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS); |
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434 static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) { |
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435 int limit = (int)end_id + 1; |
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436 initialize_wk_klasses_until((WKID) limit, start_id, THREAD); |
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437 } |
0 | 438 |
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439 public: |
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440 #define WK_KLASS_DECLARE(name, ignore_symbol, option) \ |
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441 static klassOop name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } |
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442 WK_KLASSES_DO(WK_KLASS_DECLARE); |
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443 #undef WK_KLASS_DECLARE |
0 | 444 |
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445 // Local definition for direct access to the private array: |
147 | 446 #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)] |
0 | 447 |
448 static klassOop box_klass(BasicType t) { | |
449 assert((uint)t < T_VOID+1, "range check"); | |
450 return check_klass(_box_klasses[t]); | |
451 } | |
452 static BasicType box_klass_type(klassOop k); // inverse of box_klass | |
453 | |
454 // methods returning lazily loaded klasses | |
455 // The corresponding method to load the class must be called before calling them. | |
456 static klassOop abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); } | |
457 | |
458 static void load_abstract_ownable_synchronizer_klass(TRAPS); | |
459 | |
460 private: | |
461 // Tells whether ClassLoader.loadClassInternal is present | |
462 static bool has_loadClassInternal() { return _has_loadClassInternal; } | |
463 | |
464 public: | |
465 // Tells whether ClassLoader.checkPackageAccess is present | |
466 static bool has_checkPackageAccess() { return _has_checkPackageAccess; } | |
467 | |
1142 | 468 static bool Class_klass_loaded() { return WK_KLASS(Class_klass) != NULL; } |
469 static bool Cloneable_klass_loaded() { return WK_KLASS(Cloneable_klass) != NULL; } | |
0 | 470 |
471 // Returns default system loader | |
472 static oop java_system_loader(); | |
473 | |
474 // Compute the default system loader | |
475 static void compute_java_system_loader(TRAPS); | |
476 | |
477 private: | |
478 // Mirrors for primitive classes (created eagerly) | |
479 static oop check_mirror(oop m) { | |
480 assert(m != NULL, "mirror not initialized"); | |
481 return m; | |
482 } | |
483 | |
484 public: | |
485 // Note: java_lang_Class::primitive_type is the inverse of java_mirror | |
486 | |
487 // Check class loader constraints | |
488 static bool add_loader_constraint(symbolHandle name, Handle loader1, | |
489 Handle loader2, TRAPS); | |
490 static char* check_signature_loaders(symbolHandle signature, Handle loader1, | |
491 Handle loader2, bool is_method, TRAPS); | |
492 | |
710 | 493 // JSR 292 |
494 // find the java.dyn.MethodHandles::invoke method for a given signature | |
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495 static methodOop find_method_handle_invoke(symbolHandle name, |
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496 symbolHandle signature, |
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497 KlassHandle accessing_klass, |
710 | 498 TRAPS); |
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499 // ask Java to compute a java.dyn.MethodType object for a given signature |
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500 static Handle find_method_handle_type(symbolHandle signature, |
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501 KlassHandle accessing_klass, |
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502 bool for_invokeGeneric, |
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503 bool& return_bcp_flag, |
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504 TRAPS); |
1602 | 505 // ask Java to compute a java.dyn.MethodHandle object for a given CP entry |
506 static Handle link_method_handle_constant(KlassHandle caller, | |
507 int ref_kind, //e.g., JVM_REF_invokeVirtual | |
508 KlassHandle callee, | |
509 symbolHandle name, | |
510 symbolHandle signature, | |
511 TRAPS); | |
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512 // ask Java to create a dynamic call site, while linking an invokedynamic op |
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513 static Handle make_dynamic_call_site(Handle bootstrap_method, |
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514 // Callee information: |
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515 symbolHandle name, |
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516 methodHandle signature_invoker, |
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517 Handle info, |
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518 // Caller information: |
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519 methodHandle caller_method, |
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520 int caller_bci, |
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521 TRAPS); |
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522 |
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523 // coordinate with Java about bootstrap methods |
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524 static Handle find_bootstrap_method(methodHandle caller_method, |
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525 int caller_bci, // N.B. must be an invokedynamic |
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526 int cache_index, // must be corresponding main_entry |
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527 Handle &argument_info_result, // static BSM arguments, if any |
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528 TRAPS); |
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529 |
0 | 530 // Utility for printing loader "name" as part of tracing constraints |
531 static const char* loader_name(oop loader) { | |
532 return ((loader) == NULL ? "<bootloader>" : | |
533 instanceKlass::cast((loader)->klass())->name()->as_C_string() ); | |
534 } | |
535 | |
536 // Record the error when the first attempt to resolve a reference from a constant | |
537 // pool entry to a class fails. | |
538 static void add_resolution_error(constantPoolHandle pool, int which, symbolHandle error); | |
539 static symbolOop find_resolution_error(constantPoolHandle pool, int which); | |
540 | |
541 private: | |
542 | |
543 enum Constants { | |
544 _loader_constraint_size = 107, // number of entries in constraint table | |
545 _resolution_error_size = 107, // number of entries in resolution error table | |
710 | 546 _invoke_method_size = 139, // number of entries in invoke method table |
0 | 547 _nof_buckets = 1009 // number of buckets in hash table |
548 }; | |
549 | |
550 | |
551 // Static variables | |
552 | |
553 // Hashtable holding loaded classes. | |
554 static Dictionary* _dictionary; | |
555 | |
556 // Hashtable holding placeholders for classes being loaded. | |
557 static PlaceholderTable* _placeholders; | |
558 | |
559 // Hashtable holding classes from the shared archive. | |
560 static Dictionary* _shared_dictionary; | |
561 | |
562 // Monotonically increasing counter which grows with | |
563 // _number_of_classes as well as hot-swapping and breakpoint setting | |
564 // and removal. | |
565 static int _number_of_modifications; | |
566 | |
567 // Lock object for system class loader | |
568 static oop _system_loader_lock_obj; | |
569 | |
570 // Constraints on class loaders | |
571 static LoaderConstraintTable* _loader_constraints; | |
572 | |
573 // Resolution errors | |
574 static ResolutionErrorTable* _resolution_errors; | |
575 | |
710 | 576 // Invoke methods (JSR 292) |
577 static SymbolPropertyTable* _invoke_method_table; | |
578 | |
0 | 579 public: |
580 // for VM_CounterDecay iteration support | |
581 friend class CounterDecay; | |
582 static klassOop try_get_next_class(); | |
583 | |
584 private: | |
585 static void validate_protection_domain(instanceKlassHandle klass, | |
586 Handle class_loader, | |
587 Handle protection_domain, TRAPS); | |
588 | |
589 friend class VM_PopulateDumpSharedSpace; | |
590 friend class TraversePlaceholdersClosure; | |
591 static Dictionary* dictionary() { return _dictionary; } | |
592 static Dictionary* shared_dictionary() { return _shared_dictionary; } | |
593 static PlaceholderTable* placeholders() { return _placeholders; } | |
594 static LoaderConstraintTable* constraints() { return _loader_constraints; } | |
595 static ResolutionErrorTable* resolution_errors() { return _resolution_errors; } | |
710 | 596 static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; } |
0 | 597 |
598 // Basic loading operations | |
599 static klassOop resolve_instance_class_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS); | |
600 static klassOop resolve_array_class_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS); | |
601 static instanceKlassHandle handle_parallel_super_load(symbolHandle class_name, symbolHandle supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS); | |
602 // Wait on SystemDictionary_lock; unlocks lockObject before | |
603 // waiting; relocks lockObject with correct recursion count | |
604 // after waiting, but before reentering SystemDictionary_lock | |
605 // to preserve lock order semantics. | |
606 static void double_lock_wait(Handle lockObject, TRAPS); | |
607 static void define_instance_class(instanceKlassHandle k, TRAPS); | |
608 static instanceKlassHandle find_or_define_instance_class(symbolHandle class_name, | |
609 Handle class_loader, | |
610 instanceKlassHandle k, TRAPS); | |
611 static instanceKlassHandle load_shared_class(symbolHandle class_name, | |
612 Handle class_loader, TRAPS); | |
613 static instanceKlassHandle load_shared_class(instanceKlassHandle ik, | |
614 Handle class_loader, TRAPS); | |
615 static instanceKlassHandle load_instance_class(symbolHandle class_name, Handle class_loader, TRAPS); | |
616 static Handle compute_loader_lock_object(Handle class_loader, TRAPS); | |
617 static void check_loader_lock_contention(Handle loader_lock, TRAPS); | |
514 | 618 static bool is_parallelCapable(Handle class_loader); |
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619 static bool is_parallelDefine(Handle class_loader); |
0 | 620 |
621 static klassOop find_shared_class(symbolHandle class_name); | |
622 | |
623 // Setup link to hierarchy | |
624 static void add_to_hierarchy(instanceKlassHandle k, TRAPS); | |
625 | |
626 private: | |
627 // We pass in the hashtable index so we can calculate it outside of | |
628 // the SystemDictionary_lock. | |
629 | |
630 // Basic find on loaded classes | |
631 static klassOop find_class(int index, unsigned int hash, | |
632 symbolHandle name, Handle loader); | |
633 | |
634 // Basic find on classes in the midst of being loaded | |
635 static symbolOop find_placeholder(int index, unsigned int hash, | |
636 symbolHandle name, Handle loader); | |
637 | |
638 // Basic find operation of loaded classes and classes in the midst | |
639 // of loading; used for assertions and verification only. | |
640 static oop find_class_or_placeholder(symbolHandle class_name, | |
641 Handle class_loader); | |
642 | |
643 // Updating entry in dictionary | |
644 // Add a completely loaded class | |
645 static void add_klass(int index, symbolHandle class_name, | |
646 Handle class_loader, KlassHandle obj); | |
647 | |
648 // Add a placeholder for a class being loaded | |
649 static void add_placeholder(int index, | |
650 symbolHandle class_name, | |
651 Handle class_loader); | |
652 static void remove_placeholder(int index, | |
653 symbolHandle class_name, | |
654 Handle class_loader); | |
655 | |
656 // Performs cleanups after resolve_super_or_fail. This typically needs | |
657 // to be called on failure. | |
658 // Won't throw, but can block. | |
659 static void resolution_cleanups(symbolHandle class_name, | |
660 Handle class_loader, | |
661 TRAPS); | |
662 | |
663 // Initialization | |
664 static void initialize_preloaded_classes(TRAPS); | |
665 | |
666 // Class loader constraints | |
667 static void check_constraints(int index, unsigned int hash, | |
668 instanceKlassHandle k, Handle loader, | |
669 bool defining, TRAPS); | |
670 static void update_dictionary(int d_index, unsigned int d_hash, | |
671 int p_index, unsigned int p_hash, | |
672 instanceKlassHandle k, Handle loader, TRAPS); | |
673 | |
674 // Variables holding commonly used klasses (preloaded) | |
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675 static klassOop _well_known_klasses[]; |
0 | 676 |
677 // Lazily loaded klasses | |
678 static volatile klassOop _abstract_ownable_synchronizer_klass; | |
679 | |
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680 // table of box klasses (int_klass, etc.) |
0 | 681 static klassOop _box_klasses[T_VOID+1]; |
682 | |
683 static oop _java_system_loader; | |
684 | |
685 static bool _has_loadClassInternal; | |
686 static bool _has_checkPackageAccess; | |
687 }; | |
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688 |
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689 // Cf. vmSymbols vs. vmSymbolHandles |
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690 class SystemDictionaryHandles : AllStatic { |
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691 public: |
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692 #define WK_KLASS_HANDLE_DECLARE(name, ignore_symbol, option) \ |
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693 static KlassHandle name() { \ |
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694 SystemDictionary::name(); \ |
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695 klassOop* loc = &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \ |
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696 return KlassHandle(loc, true); \ |
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697 } |
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698 WK_KLASSES_DO(WK_KLASS_HANDLE_DECLARE); |
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699 #undef WK_KLASS_HANDLE_DECLARE |
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700 |
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701 static KlassHandle box_klass(BasicType t); |
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702 }; |