Mercurial > hg > graal-compiler
annotate src/share/vm/oops/instanceKlass.hpp @ 6781:b711844284e2
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date | Fri, 21 Sep 2012 10:56:28 +0200 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, 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_OOPS_INSTANCEKLASS_HPP |
26 #define SHARE_VM_OOPS_INSTANCEKLASS_HPP | |
27 | |
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28 #include "classfile/classLoaderData.hpp" |
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29 #include "oops/annotations.hpp" |
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30 #include "oops/constMethod.hpp" |
3938 | 31 #include "oops/fieldInfo.hpp" |
1972 | 32 #include "oops/instanceOop.hpp" |
33 #include "oops/klassVtable.hpp" | |
34 #include "runtime/handles.hpp" | |
35 #include "runtime/os.hpp" | |
36 #include "utilities/accessFlags.hpp" | |
37 #include "utilities/bitMap.inline.hpp" | |
38 | |
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39 // An InstanceKlass is the VM level representation of a Java class. |
0 | 40 // It contains all information needed for at class at execution runtime. |
41 | |
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42 // InstanceKlass layout: |
0 | 43 // [C++ vtbl pointer ] Klass |
44 // [subtype cache ] Klass | |
45 // [instance size ] Klass | |
46 // [java mirror ] Klass | |
47 // [super ] Klass | |
48 // [access_flags ] Klass | |
49 // [name ] Klass | |
50 // [first subklass ] Klass | |
51 // [next sibling ] Klass | |
52 // [array klasses ] | |
53 // [methods ] | |
54 // [local interfaces ] | |
55 // [transitive interfaces ] | |
56 // [fields ] | |
57 // [constants ] | |
58 // [class loader ] | |
59 // [protection domain ] | |
60 // [signers ] | |
61 // [source file name ] | |
62 // [inner classes ] | |
63 // [static field size ] | |
64 // [nonstatic field size ] | |
65 // [static oop fields size ] | |
66 // [nonstatic oop maps size ] | |
67 // [has finalize method ] | |
68 // [deoptimization mark bit ] | |
69 // [initialization state ] | |
70 // [initializing thread ] | |
71 // [Java vtable length ] | |
72 // [oop map cache (stack maps) ] | |
73 // [EMBEDDED Java vtable ] size in words = vtable_len | |
74 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size | |
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75 // The embedded nonstatic oop-map blocks are short pairs (offset, length) |
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76 // indicating where oops are located in instances of this klass. |
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77 // [EMBEDDED implementor of the interface] only exist for interface |
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78 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled) |
0 | 79 |
80 | |
81 // forward declaration for class -- see below for definition | |
82 class SuperTypeClosure; | |
83 class JNIid; | |
84 class jniIdMapBase; | |
85 class BreakpointInfo; | |
86 class fieldDescriptor; | |
87 class DepChange; | |
88 class nmethodBucket; | |
89 class PreviousVersionNode; | |
90 class JvmtiCachedClassFieldMap; | |
91 | |
92 // This is used in iterators below. | |
93 class FieldClosure: public StackObj { | |
94 public: | |
95 virtual void do_field(fieldDescriptor* fd) = 0; | |
96 }; | |
97 | |
98 #ifndef PRODUCT | |
99 // Print fields. | |
100 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields. | |
101 class FieldPrinter: public FieldClosure { | |
102 oop _obj; | |
103 outputStream* _st; | |
104 public: | |
105 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {} | |
106 void do_field(fieldDescriptor* fd); | |
107 }; | |
108 #endif // !PRODUCT | |
109 | |
938 | 110 // ValueObjs embedded in klass. Describes where oops are located in instances of |
111 // this klass. | |
112 class OopMapBlock VALUE_OBJ_CLASS_SPEC { | |
113 public: | |
114 // Byte offset of the first oop mapped by this block. | |
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115 int offset() const { return _offset; } |
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116 void set_offset(int offset) { _offset = offset; } |
938 | 117 |
118 // Number of oops in this block. | |
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119 uint count() const { return _count; } |
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120 void set_count(uint count) { _count = count; } |
938 | 121 |
122 // sizeof(OopMapBlock) in HeapWords. | |
123 static const int size_in_words() { | |
124 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >> | |
125 LogHeapWordSize; | |
126 } | |
127 | |
128 private: | |
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129 int _offset; |
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130 uint _count; |
938 | 131 }; |
132 | |
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133 class InstanceKlass: public Klass { |
0 | 134 friend class VMStructs; |
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135 friend class ClassFileParser; |
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136 |
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137 protected: |
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138 // Constructor |
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139 InstanceKlass(int vtable_len, |
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140 int itable_len, |
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141 int static_field_size, |
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142 int nonstatic_oop_map_size, |
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143 ReferenceType rt, |
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144 AccessFlags access_flags, |
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145 bool is_anonymous); |
0 | 146 public: |
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147 static Klass* allocate_instance_klass(ClassLoaderData* loader_data, |
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148 int vtable_len, |
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149 int itable_len, |
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150 int static_field_size, |
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151 int nonstatic_oop_map_size, |
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152 ReferenceType rt, |
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153 AccessFlags access_flags, |
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154 Symbol* name, |
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155 Klass* super_klass, |
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156 KlassHandle host_klass, |
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157 TRAPS); |
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158 |
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159 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } |
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160 |
0 | 161 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description |
162 // of the class loading & initialization procedure, and the use of the states. | |
163 enum ClassState { | |
164 allocated, // allocated (but not yet linked) | |
165 loaded, // loaded and inserted in class hierarchy (but not linked yet) | |
166 linked, // successfully linked/verified (but not initialized yet) | |
167 being_initialized, // currently running class initializer | |
168 fully_initialized, // initialized (successfull final state) | |
169 initialization_error // error happened during initialization | |
170 }; | |
171 | |
172 protected: | |
173 // Protection domain. | |
174 oop _protection_domain; | |
175 // Class signers. | |
176 objArrayOop _signers; | |
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177 // Initialization lock. Must be one per class and it has to be a VM internal |
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178 // object so java code cannot lock it (like the mirror) |
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179 // It has to be an object not a Mutex because it's held through java calls. |
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180 volatile oop _init_lock; |
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181 |
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182 // Annotations for this class |
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183 Annotations* _annotations; |
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184 // Array classes holding elements of this class. |
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185 Klass* _array_klasses; |
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186 // Constant pool for this class. |
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187 ConstantPool* _constants; |
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188 // The InnerClasses attribute and EnclosingMethod attribute. The |
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189 // _inner_classes is an array of shorts. If the class has InnerClasses |
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190 // attribute, then the _inner_classes array begins with 4-tuples of shorts |
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191 // [inner_class_info_index, outer_class_info_index, |
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192 // inner_name_index, inner_class_access_flags] for the InnerClasses |
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193 // attribute. If the EnclosingMethod attribute exists, it occupies the |
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194 // last two shorts [class_index, method_index] of the array. If only |
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195 // the InnerClasses attribute exists, the _inner_classes array length is |
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196 // number_of_inner_classes * 4. If the class has both InnerClasses |
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197 // and EnclosingMethod attributes the _inner_classes array length is |
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198 // number_of_inner_classes * 4 + enclosing_method_attribute_size. |
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199 Array<jushort>* _inner_classes; |
0 | 200 |
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201 // Name of source file containing this klass, NULL if not specified. |
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202 Symbol* _source_file_name; |
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203 // the source debug extension for this klass, NULL if not specified. |
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204 // Specified as UTF-8 string without terminating zero byte in the classfile, |
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205 // it is stored in the instanceklass as a NULL-terminated UTF-8 string |
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206 char* _source_debug_extension; |
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207 // Generic signature, or null if none. |
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208 Symbol* _generic_signature; |
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209 // Array name derived from this class which needs unreferencing |
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210 // if this class is unloaded. |
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211 Symbol* _array_name; |
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212 |
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213 // Number of heapOopSize words used by non-static fields in this klass |
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214 // (including inherited fields but after header_size()). |
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215 int _nonstatic_field_size; |
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216 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass |
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217 u2 _static_oop_field_count;// number of static oop fields in this klass |
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218 u2 _java_fields_count; // The number of declared Java fields |
938 | 219 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks |
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220 |
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221 bool _is_marked_dependent; // used for marking during flushing and deoptimization |
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222 enum { |
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223 _misc_rewritten = 1 << 0, // methods rewritten. |
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224 _misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops |
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225 _misc_should_verify_class = 1 << 2, // allow caching of preverification |
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226 _misc_is_anonymous = 1 << 3 // has embedded _inner_classes field |
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227 }; |
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228 u2 _misc_flags; |
0 | 229 u2 _minor_version; // minor version number of class file |
230 u2 _major_version; // major version number of class file | |
231 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization) | |
232 int _vtable_len; // length of Java vtable (in words) | |
233 int _itable_len; // length of Java itable (in words) | |
234 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) | |
235 JNIid* _jni_ids; // First JNI identifier for static fields in this class | |
236 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none | |
237 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL | |
238 nmethodBucket* _dependencies; // list of dependent nmethods | |
239 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class | |
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240 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* |
0 | 241 // Array of interesting part(s) of the previous version(s) of this |
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242 // InstanceKlass. See PreviousVersionWalker below. |
0 | 243 GrowableArray<PreviousVersionNode *>* _previous_versions; |
244 // JVMTI fields can be moved to their own structure - see 6315920 | |
245 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH | |
246 jint _cached_class_file_len; // JVMTI: length of above | |
247 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration | |
248 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change | |
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249 // Method array. |
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250 Array<Method*>* _methods; |
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251 // Interface (Klass*s) this class declares locally to implement. |
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252 Array<Klass*>* _local_interfaces; |
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253 // Interface (Klass*s) this class implements transitively. |
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254 Array<Klass*>* _transitive_interfaces; |
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255 // Int array containing the original order of method in the class file (for JVMTI). |
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256 Array<int>* _method_ordering; |
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257 // Instance and static variable information, starts with 6-tuples of shorts |
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258 // [access, name index, sig index, initval index, low_offset, high_offset] |
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259 // for all fields, followed by the generic signature data at the end of |
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260 // the array. Only fields with generic signature attributes have the generic |
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261 // signature data set in the array. The fields array looks like following: |
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262 // |
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263 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] |
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264 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] |
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265 // ... |
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266 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] |
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267 // [generic signature index] |
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268 // [generic signature index] |
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269 // ... |
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270 Array<u2>* _fields; |
0 | 271 |
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272 // Class states are defined as ClassState (see above). |
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273 // Place the _init_state here to utilize the unused 2-byte after |
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274 // _idnum_allocated_count. |
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275 u1 _init_state; // state of class |
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276 |
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277 u1 _reference_type; // reference type |
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278 |
0 | 279 // embedded Java vtable follows here |
280 // embedded Java itables follows here | |
281 // embedded static fields follows here | |
282 // embedded nonstatic oop-map blocks follows here | |
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283 // embedded implementor of this interface follows here |
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284 // The embedded implementor only exists if the current klass is an |
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285 // iterface. The possible values of the implementor fall into following |
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286 // three cases: |
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287 // NULL: no implementor. |
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288 // A Klass* that's not itself: one implementor. |
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289 // Itsef: more than one implementors. |
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290 // embedded host klass follows here |
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291 // The embedded host klass only exists in an anonymous class for |
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292 // dynamic language support (JSR 292 enabled). The host class grants |
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293 // its access privileges to this class also. The host class is either |
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294 // named, or a previously loaded anonymous class. A non-anonymous class |
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295 // or an anonymous class loaded through normal classloading does not |
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296 // have this embedded field. |
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297 // |
0 | 298 |
299 friend class SystemDictionary; | |
300 | |
301 public: | |
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302 bool has_nonstatic_fields() const { |
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303 return (_misc_flags & _misc_has_nonstatic_fields) != 0; |
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304 } |
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305 void set_has_nonstatic_fields(bool b) { |
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306 if (b) { |
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307 _misc_flags |= _misc_has_nonstatic_fields; |
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308 } else { |
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309 _misc_flags &= ~_misc_has_nonstatic_fields; |
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310 } |
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311 } |
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312 |
0 | 313 // field sizes |
314 int nonstatic_field_size() const { return _nonstatic_field_size; } | |
315 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } | |
316 | |
317 int static_field_size() const { return _static_field_size; } | |
318 void set_static_field_size(int size) { _static_field_size = size; } | |
319 | |
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320 int static_oop_field_count() const { return (int)_static_oop_field_count; } |
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321 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } |
0 | 322 |
323 // Java vtable | |
324 int vtable_length() const { return _vtable_len; } | |
325 void set_vtable_length(int len) { _vtable_len = len; } | |
326 | |
327 // Java itable | |
328 int itable_length() const { return _itable_len; } | |
329 void set_itable_length(int len) { _itable_len = len; } | |
330 | |
331 // array klasses | |
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332 Klass* array_klasses() const { return _array_klasses; } |
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333 void set_array_klasses(Klass* k) { _array_klasses = k; } |
0 | 334 |
335 // methods | |
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336 Array<Method*>* methods() const { return _methods; } |
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337 void set_methods(Array<Method*>* a) { _methods = a; } |
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338 Method* method_with_idnum(int idnum); |
0 | 339 |
340 // method ordering | |
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341 Array<int>* method_ordering() const { return _method_ordering; } |
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342 void set_method_ordering(Array<int>* m) { _method_ordering = m; } |
0 | 343 |
344 // interfaces | |
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345 Array<Klass*>* local_interfaces() const { return _local_interfaces; } |
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346 void set_local_interfaces(Array<Klass*>* a) { |
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347 guarantee(_local_interfaces == NULL || a == NULL, "Just checking"); |
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348 _local_interfaces = a; } |
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349 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; } |
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350 void set_transitive_interfaces(Array<Klass*>* a) { |
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351 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking"); |
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352 _transitive_interfaces = a; } |
0 | 353 |
3938 | 354 private: |
355 friend class fieldDescriptor; | |
356 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } | |
357 | |
358 public: | |
359 int field_offset (int index) const { return field(index)->offset(); } | |
360 int field_access_flags(int index) const { return field(index)->access_flags(); } | |
361 Symbol* field_name (int index) const { return field(index)->name(constants()); } | |
362 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } | |
363 | |
364 // Number of Java declared fields | |
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365 int java_fields_count() const { return (int)_java_fields_count; } |
3938 | 366 |
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367 Array<u2>* fields() const { return _fields; } |
3938 | 368 |
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369 void set_fields(Array<u2>* f, u2 java_fields_count) { |
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370 guarantee(_fields == NULL || f == NULL, "Just checking"); |
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371 _fields = f; |
3938 | 372 _java_fields_count = java_fields_count; |
0 | 373 } |
374 | |
375 // inner classes | |
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376 Array<u2>* inner_classes() const { return _inner_classes; } |
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377 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } |
0 | 378 |
379 enum InnerClassAttributeOffset { | |
380 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 | |
381 inner_class_inner_class_info_offset = 0, | |
382 inner_class_outer_class_info_offset = 1, | |
383 inner_class_inner_name_offset = 2, | |
384 inner_class_access_flags_offset = 3, | |
385 inner_class_next_offset = 4 | |
386 }; | |
387 | |
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388 enum EnclosingMethodAttributeOffset { |
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389 enclosing_method_class_index_offset = 0, |
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390 enclosing_method_method_index_offset = 1, |
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391 enclosing_method_attribute_size = 2 |
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392 }; |
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393 |
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394 // method override check |
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395 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); |
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396 |
0 | 397 // package |
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398 bool is_same_class_package(Klass* class2); |
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399 bool is_same_class_package(oop classloader2, Symbol* classname2); |
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400 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2); |
0 | 401 |
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402 // find an enclosing class (defined where original code was, in jvm.cpp!) |
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403 Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) { |
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404 instanceKlassHandle self(THREAD, this); |
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405 return compute_enclosing_class_impl(self, inner_is_member, THREAD); |
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406 } |
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407 static Klass* compute_enclosing_class_impl(instanceKlassHandle self, |
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408 bool* inner_is_member, TRAPS); |
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409 |
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410 // tell if two classes have the same enclosing class (at package level) |
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411 bool is_same_package_member(Klass* class2, TRAPS) { |
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412 instanceKlassHandle self(THREAD, this); |
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413 return is_same_package_member_impl(self, class2, THREAD); |
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414 } |
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415 static bool is_same_package_member_impl(instanceKlassHandle self, |
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416 Klass* class2, TRAPS); |
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417 |
0 | 418 // initialization state |
419 bool is_loaded() const { return _init_state >= loaded; } | |
420 bool is_linked() const { return _init_state >= linked; } | |
421 bool is_initialized() const { return _init_state == fully_initialized; } | |
422 bool is_not_initialized() const { return _init_state < being_initialized; } | |
423 bool is_being_initialized() const { return _init_state == being_initialized; } | |
424 bool is_in_error_state() const { return _init_state == initialization_error; } | |
425 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } | |
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426 ClassState init_state() { return (ClassState)_init_state; } |
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427 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; } |
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428 |
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429 // defineClass specified verification |
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430 bool should_verify_class() const { |
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431 return (_misc_flags & _misc_should_verify_class) != 0; |
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432 } |
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433 void set_should_verify_class(bool value) { |
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434 if (value) { |
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435 _misc_flags |= _misc_should_verify_class; |
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436 } else { |
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437 _misc_flags &= ~_misc_should_verify_class; |
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438 } |
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439 } |
0 | 440 |
441 // marking | |
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442 bool is_marked_dependent() const { return _is_marked_dependent; } |
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443 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } |
0 | 444 |
445 // initialization (virtuals from Klass) | |
446 bool should_be_initialized() const; // means that initialize should be called | |
447 void initialize(TRAPS); | |
448 void link_class(TRAPS); | |
449 bool link_class_or_fail(TRAPS); // returns false on failure | |
450 void unlink_class(); | |
451 void rewrite_class(TRAPS); | |
3748 | 452 void relocate_and_link_methods(TRAPS); |
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453 Method* class_initializer(); |
0 | 454 |
455 // set the class to initialized if no static initializer is present | |
456 void eager_initialize(Thread *thread); | |
457 | |
458 // reference type | |
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459 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } |
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460 void set_reference_type(ReferenceType t) { |
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461 assert(t == (u1)t, "overflow"); |
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462 _reference_type = (u1)t; |
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463 } |
0 | 464 |
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465 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); } |
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466 |
0 | 467 // find local field, returns true if found |
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468 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; |
0 | 469 // find field in direct superinterfaces, returns the interface in which the field is defined |
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470 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; |
0 | 471 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined |
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472 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; |
0 | 473 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined |
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474 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; |
0 | 475 |
476 // find a non-static or static field given its offset within the class. | |
477 bool contains_field_offset(int offset) { | |
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478 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); |
0 | 479 } |
480 | |
481 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; | |
482 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; | |
483 | |
484 // find a local method (returns NULL if not found) | |
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485 Method* find_method(Symbol* name, Symbol* signature) const; |
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486 static Method* find_method(Array<Method*>* methods, Symbol* name, Symbol* signature); |
0 | 487 |
488 // lookup operation (returns NULL if not found) | |
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489 Method* uncached_lookup_method(Symbol* name, Symbol* signature) const; |
0 | 490 |
491 // lookup a method in all the interfaces that this class implements | |
492 // (returns NULL if not found) | |
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493 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature) const; |
0 | 494 |
495 // constant pool | |
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496 ConstantPool* constants() const { return _constants; } |
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497 void set_constants(ConstantPool* c) { _constants = c; } |
0 | 498 |
499 // protection domain | |
500 oop protection_domain() { return _protection_domain; } | |
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501 void set_protection_domain(oop pd) { klass_oop_store(&_protection_domain, pd); } |
0 | 502 |
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503 // host class |
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504 Klass* host_klass() const { |
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505 Klass** hk = (Klass**)adr_host_klass(); |
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506 if (hk == NULL) { |
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507 return NULL; |
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508 } else { |
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509 return *hk; |
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510 } |
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511 } |
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512 void set_host_klass(Klass* host) { |
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513 assert(is_anonymous(), "not anonymous"); |
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514 Klass** addr = (Klass**)adr_host_klass(); |
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515 assert(addr != NULL, "no reversed space"); |
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516 *addr = host; |
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517 } |
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518 bool is_anonymous() const { |
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519 return (_misc_flags & _misc_is_anonymous) != 0; |
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520 } |
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521 void set_is_anonymous(bool value) { |
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522 if (value) { |
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523 _misc_flags |= _misc_is_anonymous; |
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524 } else { |
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525 _misc_flags &= ~_misc_is_anonymous; |
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526 } |
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527 } |
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528 |
0 | 529 // signers |
530 objArrayOop signers() const { return _signers; } | |
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531 void set_signers(objArrayOop s) { klass_oop_store((oop*)&_signers, s); } |
0 | 532 |
533 // source file name | |
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534 Symbol* source_file_name() const { return _source_file_name; } |
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535 void set_source_file_name(Symbol* n); |
0 | 536 |
537 // minor and major version numbers of class file | |
538 u2 minor_version() const { return _minor_version; } | |
539 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } | |
540 u2 major_version() const { return _major_version; } | |
541 void set_major_version(u2 major_version) { _major_version = major_version; } | |
542 | |
543 // source debug extension | |
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544 char* source_debug_extension() const { return _source_debug_extension; } |
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545 void set_source_debug_extension(char* array, int length); |
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546 |
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547 // symbol unloading support (refcount already added) |
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548 Symbol* array_name() { return _array_name; } |
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549 void set_array_name(Symbol* name) { assert(_array_name == NULL, "name already created"); _array_name = name; } |
0 | 550 |
551 // nonstatic oop-map blocks | |
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552 static int nonstatic_oop_map_size(unsigned int oop_map_count) { |
938 | 553 return oop_map_count * OopMapBlock::size_in_words(); |
554 } | |
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555 unsigned int nonstatic_oop_map_count() const { |
938 | 556 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); |
557 } | |
558 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } | |
559 void set_nonstatic_oop_map_size(int words) { | |
560 _nonstatic_oop_map_size = words; | |
561 } | |
0 | 562 |
563 // RedefineClasses() support for previous versions: | |
564 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods, | |
565 int emcp_method_count); | |
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566 // If the _previous_versions array is non-NULL, then this klass |
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567 // has been redefined at least once even if we aren't currently |
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568 // tracking a previous version. |
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569 bool has_been_redefined() const { return _previous_versions != NULL; } |
0 | 570 bool has_previous_version() const; |
571 void init_previous_versions() { | |
572 _previous_versions = NULL; | |
573 } | |
574 GrowableArray<PreviousVersionNode *>* previous_versions() const { | |
575 return _previous_versions; | |
576 } | |
577 | |
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578 static void purge_previous_versions(InstanceKlass* ik); |
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579 |
0 | 580 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation |
581 void set_cached_class_file(unsigned char *class_file_bytes, | |
582 jint class_file_len) { _cached_class_file_len = class_file_len; | |
583 _cached_class_file_bytes = class_file_bytes; } | |
584 jint get_cached_class_file_len() { return _cached_class_file_len; } | |
585 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; } | |
586 | |
587 // JVMTI: Support for caching of field indices, types, and offsets | |
588 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { | |
589 _jvmti_cached_class_field_map = descriptor; | |
590 } | |
591 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { | |
592 return _jvmti_cached_class_field_map; | |
593 } | |
594 | |
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595 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available |
0 | 596 inline u2 next_method_idnum(); |
597 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } | |
598 | |
599 // generics support | |
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600 Symbol* generic_signature() const { return _generic_signature; } |
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601 void set_generic_signature(Symbol* sig) { _generic_signature = sig; } |
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602 |
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603 u2 enclosing_method_data(int offset); |
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604 u2 enclosing_method_class_index() { |
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605 return enclosing_method_data(enclosing_method_class_index_offset); |
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606 } |
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607 u2 enclosing_method_method_index() { |
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608 return enclosing_method_data(enclosing_method_method_index_offset); |
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609 } |
0 | 610 void set_enclosing_method_indices(u2 class_index, |
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611 u2 method_index); |
0 | 612 |
613 // jmethodID support | |
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614 static jmethodID get_jmethod_id(instanceKlassHandle ik_h, |
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615 methodHandle method_h); |
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616 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h, |
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617 size_t idnum, jmethodID new_id, jmethodID* new_jmeths, |
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618 jmethodID* to_dealloc_id_p, |
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619 jmethodID** to_dealloc_jmeths_p); |
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620 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, |
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621 size_t *length_p, jmethodID* id_p); |
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622 jmethodID jmethod_id_or_null(Method* method); |
0 | 623 |
624 // cached itable index support | |
625 void set_cached_itable_index(size_t idnum, int index); | |
626 int cached_itable_index(size_t idnum); | |
627 | |
628 // annotations support | |
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629 Annotations* annotations() const { return _annotations; } |
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630 void set_annotations(Annotations* anno) { _annotations = anno; } |
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631 AnnotationArray* class_annotations() const { |
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632 if (annotations() == NULL) return NULL; |
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633 return annotations()->class_annotations(); |
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634 } |
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635 Array<AnnotationArray*>* fields_annotations() const { |
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636 if (annotations() == NULL) return NULL; |
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637 return annotations()->fields_annotations(); |
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638 } |
0 | 639 |
640 // allocation | |
641 instanceOop allocate_instance(TRAPS); | |
642 | |
643 // additional member function to return a handle | |
644 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); } | |
645 | |
646 objArrayOop allocate_objArray(int n, int length, TRAPS); | |
647 // Helper function | |
648 static instanceOop register_finalizer(instanceOop i, TRAPS); | |
649 | |
650 // Check whether reflection/jni/jvm code is allowed to instantiate this class; | |
651 // if not, throw either an Error or an Exception. | |
652 virtual void check_valid_for_instantiation(bool throwError, TRAPS); | |
653 | |
654 // initialization | |
655 void call_class_initializer(TRAPS); | |
656 void set_initialization_state_and_notify(ClassState state, TRAPS); | |
657 | |
658 // OopMapCache support | |
659 OopMapCache* oop_map_cache() { return _oop_map_cache; } | |
660 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } | |
661 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry); | |
662 | |
663 // JNI identifier support (for static fields - for jni performance) | |
664 JNIid* jni_ids() { return _jni_ids; } | |
665 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } | |
666 JNIid* jni_id_for(int offset); | |
667 | |
668 // maintenance of deoptimization dependencies | |
669 int mark_dependent_nmethods(DepChange& changes); | |
670 void add_dependent_nmethod(nmethod* nm); | |
671 void remove_dependent_nmethod(nmethod* nm); | |
672 | |
673 // On-stack replacement support | |
674 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; | |
675 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; | |
676 void add_osr_nmethod(nmethod* n); | |
677 void remove_osr_nmethod(nmethod* n); | |
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678 nmethod* lookup_osr_nmethod(Method* const m, int bci, int level, bool match_level) const; |
0 | 679 |
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680 // Breakpoint support (see methods on Method* for details) |
0 | 681 BreakpointInfo* breakpoints() const { return _breakpoints; }; |
682 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; | |
683 | |
684 // support for stub routines | |
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685 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } |
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686 TRACE_DEFINE_OFFSET; |
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687 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } |
0 | 688 |
689 // subclass/subinterface checks | |
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690 bool implements_interface(Klass* k) const; |
0 | 691 |
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692 // Access to the implementor of an interface. |
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693 Klass* implementor() const |
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694 { |
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695 Klass** k = adr_implementor(); |
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696 if (k == NULL) { |
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697 return NULL; |
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698 } else { |
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699 return *k; |
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700 } |
0 | 701 } |
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702 |
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703 void set_implementor(Klass* k) { |
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704 assert(is_interface(), "not interface"); |
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705 Klass** addr = adr_implementor(); |
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706 *addr = k; |
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707 } |
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708 |
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709 int nof_implementors() const { |
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710 Klass* k = implementor(); |
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711 if (k == NULL) { |
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712 return 0; |
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713 } else if (k != this) { |
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714 return 1; |
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715 } else { |
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716 return 2; |
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717 } |
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718 } |
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719 |
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720 void add_implementor(Klass* k); // k is a new class that implements this interface |
0 | 721 void init_implementor(); // initialize |
722 | |
723 // link this class into the implementors list of every interface it implements | |
724 void process_interfaces(Thread *thread); | |
725 | |
726 // virtual operations from Klass | |
727 bool is_leaf_class() const { return _subklass == NULL; } | |
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728 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots); |
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729 bool compute_is_subtype_of(Klass* k); |
0 | 730 bool can_be_primary_super_slow() const; |
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731 Klass* java_super() const { return super(); } |
0 | 732 int oop_size(oop obj) const { return size_helper(); } |
733 bool oop_is_instance_slow() const { return true; } | |
734 | |
735 // Iterators | |
736 void do_local_static_fields(FieldClosure* cl); | |
737 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields | |
738 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS); | |
739 | |
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740 void methods_do(void f(Method* method)); |
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741 void array_klasses_do(void f(Klass* k)); |
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742 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); |
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743 void with_array_klasses_do(void f(Klass* k)); |
0 | 744 bool super_types_do(SuperTypeClosure* blk); |
745 | |
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746 // Casting from Klass* |
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747 static InstanceKlass* cast(Klass* k) { |
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748 assert(k->is_klass(), "must be"); |
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749 assert(k->oop_is_instance(), "cast to InstanceKlass"); |
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750 return (InstanceKlass*) k; |
0 | 751 } |
752 | |
753 // Sizing (in words) | |
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754 static int header_size() { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); } |
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755 static int size(int vtable_length, int itable_length, |
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756 int nonstatic_oop_map_size, |
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757 bool is_interface, bool is_anonymous) { |
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758 return align_object_size(header_size() + |
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759 align_object_offset(vtable_length) + |
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760 align_object_offset(itable_length) + |
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761 ((is_interface || is_anonymous) ? |
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762 align_object_offset(nonstatic_oop_map_size) : |
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763 nonstatic_oop_map_size) + |
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764 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) + |
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765 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0)); |
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766 } |
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767 int size() const { return size(vtable_length(), |
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768 itable_length(), |
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769 nonstatic_oop_map_size(), |
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770 is_interface(), |
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771 is_anonymous()); |
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772 } |
5998
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773 |
0 | 774 static int vtable_start_offset() { return header_size(); } |
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775 static int vtable_length_offset() { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; } |
0 | 776 |
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777 intptr_t* start_of_vtable() const { return ((intptr_t*)this) + vtable_start_offset(); } |
0 | 778 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); } |
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779 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; } |
0 | 780 |
781 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } | |
782 | |
2376
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783 address static_field_addr(int offset); |
113
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784 |
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785 OopMapBlock* start_of_nonstatic_oop_maps() const { |
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786 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length())); |
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787 } |
0 | 788 |
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789 Klass** adr_implementor() const { |
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790 if (is_interface()) { |
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791 return (Klass**)(start_of_nonstatic_oop_maps() + |
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792 nonstatic_oop_map_count()); |
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793 } else { |
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794 return NULL; |
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795 } |
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796 }; |
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797 |
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798 Klass** adr_host_klass() const { |
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799 if (is_anonymous()) { |
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800 Klass** adr_impl = adr_implementor(); |
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801 if (adr_impl != NULL) { |
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802 return adr_impl + 1; |
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803 } else { |
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804 return (Klass**)(start_of_nonstatic_oop_maps() + |
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805 nonstatic_oop_map_count()); |
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806 } |
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807 } else { |
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808 return NULL; |
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809 } |
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810 } |
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811 |
0 | 812 // Allocation profiling support |
813 juint alloc_size() const { return _alloc_count * size_helper(); } | |
814 void set_alloc_size(juint n) {} | |
815 | |
816 // Use this to return the size of an instance in heap words: | |
817 int size_helper() const { | |
818 return layout_helper_to_size_helper(layout_helper()); | |
819 } | |
820 | |
821 // This bit is initialized in classFileParser.cpp. | |
822 // It is false under any of the following conditions: | |
823 // - the class is abstract (including any interface) | |
824 // - the class has a finalizer (if !RegisterFinalizersAtInit) | |
825 // - the class size is larger than FastAllocateSizeLimit | |
826 // - the class is java/lang/Class, which cannot be allocated directly | |
827 bool can_be_fastpath_allocated() const { | |
828 return !layout_helper_needs_slow_path(layout_helper()); | |
829 } | |
830 | |
831 // Java vtable/itable | |
832 klassVtable* vtable() const; // return new klassVtable wrapper | |
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833 inline Method* method_at_vtable(int index); |
0 | 834 klassItable* itable() const; // return new klassItable wrapper |
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835 Method* method_at_itable(Klass* holder, int index, TRAPS); |
0 | 836 |
837 // Garbage collection | |
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838 virtual void oops_do(OopClosure* cl); |
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839 |
0 | 840 void oop_follow_contents(oop obj); |
841 int oop_adjust_pointers(oop obj); | |
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842 |
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843 void clean_implementors_list(BoolObjectClosure* is_alive); |
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844 void clean_method_data(BoolObjectClosure* is_alive); |
0 | 845 |
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846 // Explicit metaspace deallocation of fields |
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847 // For RedefineClasses, we need to deallocate instanceKlasses |
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848 void deallocate_contents(ClassLoaderData* loader_data); |
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849 |
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850 // The constant pool is on stack if any of the methods are executing or |
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851 // referenced by handles. |
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852 bool on_stack() const { return _constants->on_stack(); } |
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853 |
0 | 854 void release_C_heap_structures(); |
855 | |
856 // Parallel Scavenge and Parallel Old | |
857 PARALLEL_GC_DECLS | |
858 | |
859 // Naming | |
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860 const char* signature_name() const; |
0 | 861 |
862 // Iterators | |
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863 int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) { |
0 | 864 return oop_oop_iterate_v(obj, blk); |
865 } | |
866 | |
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867 int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) { |
0 | 868 return oop_oop_iterate_v_m(obj, blk, mr); |
869 } | |
870 | |
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871 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ |
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872 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ |
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873 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \ |
0 | 874 MemRegion mr); |
875 | |
876 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL) | |
342
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877 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL) |
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878 |
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879 #ifndef SERIALGC |
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880 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ |
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881 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk); |
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882 |
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883 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
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884 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
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885 #endif // !SERIALGC |
0 | 886 |
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887 u2 idnum_allocated_count() const { return _idnum_allocated_count; } |
0 | 888 private: |
889 // initialization state | |
890 #ifdef ASSERT | |
891 void set_init_state(ClassState state); | |
892 #else | |
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893 void set_init_state(ClassState state) { _init_state = (u1)state; } |
0 | 894 #endif |
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895 void set_rewritten() { _misc_flags |= _misc_rewritten; } |
0 | 896 void set_init_thread(Thread *thread) { _init_thread = thread; } |
897 | |
977
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898 // The RedefineClasses() API can cause new method idnums to be needed |
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899 // which will cause the caches to grow. Safety requires different |
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900 // cache management logic if the caches can grow instead of just |
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901 // going from NULL to non-NULL. |
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902 bool idnum_can_increment() const { return has_been_redefined(); } |
0 | 903 jmethodID* methods_jmethod_ids_acquire() const |
904 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); } | |
905 void release_set_methods_jmethod_ids(jmethodID* jmeths) | |
906 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); } | |
907 | |
908 int* methods_cached_itable_indices_acquire() const | |
909 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); } | |
910 void release_set_methods_cached_itable_indices(int* indices) | |
911 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); } | |
912 | |
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913 // Lock during initialization |
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914 volatile oop init_lock() const; |
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915 void set_init_lock(oop value) { klass_oop_store(&_init_lock, value); } |
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916 void fence_and_clear_init_lock(); // after fully_initialized |
0 | 917 |
918 // Offsets for memory management | |
919 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;} | |
920 oop* adr_signers() const { return (oop*)&this->_signers;} | |
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921 oop* adr_init_lock() const { return (oop*)&this->_init_lock;} |
0 | 922 |
923 // Static methods that are used to implement member methods where an exposed this pointer | |
924 // is needed due to possible GCs | |
925 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); | |
926 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); | |
927 static void initialize_impl (instanceKlassHandle this_oop, TRAPS); | |
928 static void eager_initialize_impl (instanceKlassHandle this_oop); | |
929 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS); | |
930 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS); | |
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931 static Klass* array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS); |
0 | 932 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS); |
933 /* jni_id_for_impl for jfieldID only */ | |
934 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset); | |
935 | |
936 // Returns the array class for the n'th dimension | |
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937 Klass* array_klass_impl(bool or_null, int n, TRAPS); |
0 | 938 |
939 // Returns the array class with this class as element type | |
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940 Klass* array_klass_impl(bool or_null, TRAPS); |
0 | 941 |
942 public: | |
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943 // CDS support - remove and restore oops from metadata. Oops are not shared. |
0 | 944 virtual void remove_unshareable_info(); |
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945 virtual void restore_unshareable_info(TRAPS); |
0 | 946 |
947 // jvm support | |
948 jint compute_modifier_flags(TRAPS) const; | |
949 | |
950 public: | |
951 // JVMTI support | |
952 jint jvmti_class_status() const; | |
953 | |
954 public: | |
955 // Printing | |
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956 #ifndef PRODUCT |
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957 void print_on(outputStream* st) const; |
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958 #endif |
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959 void print_value_on(outputStream* st) const; |
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960 |
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961 void oop_print_value_on(oop obj, outputStream* st); |
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962 |
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963 #ifndef PRODUCT |
0 | 964 void oop_print_on (oop obj, outputStream* st); |
965 | |
966 void print_dependent_nmethods(bool verbose = false); | |
967 bool is_dependent_nmethod(nmethod* nm); | |
968 #endif | |
969 | |
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970 const char* internal_name() const; |
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971 |
0 | 972 // Verification |
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973 void verify_on(outputStream* st); |
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974 |
0 | 975 void oop_verify_on(oop obj, outputStream* st); |
976 }; | |
977 | |
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978 inline Method* InstanceKlass::method_at_vtable(int index) { |
0 | 979 #ifndef PRODUCT |
980 assert(index >= 0, "valid vtable index"); | |
981 if (DebugVtables) { | |
982 verify_vtable_index(index); | |
983 } | |
984 #endif | |
985 vtableEntry* ve = (vtableEntry*)start_of_vtable(); | |
986 return ve[index].method(); | |
987 } | |
988 | |
989 // for adding methods | |
990 // UNSET_IDNUM return means no more ids available | |
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991 inline u2 InstanceKlass::next_method_idnum() { |
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992 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { |
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993 return ConstMethod::UNSET_IDNUM; // no more ids available |
0 | 994 } else { |
995 return _idnum_allocated_count++; | |
996 } | |
997 } | |
998 | |
999 | |
1000 /* JNIid class for jfieldIDs only */ | |
6197 | 1001 class JNIid: public CHeapObj<mtClass> { |
0 | 1002 friend class VMStructs; |
1003 private: | |
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1004 Klass* _holder; |
0 | 1005 JNIid* _next; |
1006 int _offset; | |
1007 #ifdef ASSERT | |
1008 bool _is_static_field_id; | |
1009 #endif | |
1010 | |
1011 public: | |
1012 // Accessors | |
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1013 Klass* holder() const { return _holder; } |
0 | 1014 int offset() const { return _offset; } |
1015 JNIid* next() { return _next; } | |
1016 // Constructor | |
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1017 JNIid(Klass* holder, int offset, JNIid* next); |
0 | 1018 // Identifier lookup |
1019 JNIid* find(int offset); | |
1020 | |
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1021 bool find_local_field(fieldDescriptor* fd) { |
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1022 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); |
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1023 } |
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1024 |
0 | 1025 static void deallocate(JNIid* id); |
1026 // Debugging | |
1027 #ifdef ASSERT | |
1028 bool is_static_field_id() const { return _is_static_field_id; } | |
1029 void set_is_static_field_id() { _is_static_field_id = true; } | |
1030 #endif | |
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1031 void verify(Klass* holder); |
0 | 1032 }; |
1033 | |
1034 | |
1035 // If breakpoints are more numerous than just JVMTI breakpoints, | |
1036 // consider compressing this data structure. | |
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1037 // It is currently a simple linked list defined in method.hpp. |
0 | 1038 |
1039 class BreakpointInfo; | |
1040 | |
1041 | |
1042 // A collection point for interesting information about the previous | |
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1043 // version(s) of an InstanceKlass. This class uses weak references to |
0 | 1044 // the information so that the information may be collected as needed |
47
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1045 // by the system. If the information is shared, then a regular |
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1046 // reference must be used because a weak reference would be seen as |
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1047 // collectible. A GrowableArray of PreviousVersionNodes is attached |
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1048 // to the InstanceKlass as needed. See PreviousVersionWalker below. |
6197 | 1049 class PreviousVersionNode : public CHeapObj<mtClass> { |
0 | 1050 private: |
47
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1051 // A shared ConstantPool is never collected so we'll always have |
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1052 // a reference to it so we can update items in the cache. We'll |
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1053 // have a weak reference to a non-shared ConstantPool until all |
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1054 // of the methods (EMCP or obsolete) have been collected; the |
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1055 // non-shared ConstantPool becomes collectible at that point. |
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1056 ConstantPool* _prev_constant_pool; // regular or weak reference |
47
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1057 bool _prev_cp_is_weak; // true if not a shared ConstantPool |
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1058 |
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1059 // If the previous version of the InstanceKlass doesn't have any |
0 | 1060 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the |
1061 // EMCP methods have been collected, then _prev_EMCP_methods can | |
1062 // have a length of zero. | |
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1063 GrowableArray<Method*>* _prev_EMCP_methods; |
0 | 1064 |
1065 public: | |
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1066 PreviousVersionNode(ConstantPool* prev_constant_pool, bool prev_cp_is_weak, |
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1067 GrowableArray<Method*>* prev_EMCP_methods); |
0 | 1068 ~PreviousVersionNode(); |
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1069 ConstantPool* prev_constant_pool() const { |
0 | 1070 return _prev_constant_pool; |
1071 } | |
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1072 GrowableArray<Method*>* prev_EMCP_methods() const { |
0 | 1073 return _prev_EMCP_methods; |
1074 } | |
1075 }; | |
1076 | |
1077 | |
1078 // A Handle-ized version of PreviousVersionNode. | |
1079 class PreviousVersionInfo : public ResourceObj { | |
1080 private: | |
1081 constantPoolHandle _prev_constant_pool_handle; | |
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1082 // If the previous version of the InstanceKlass doesn't have any |
0 | 1083 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the |
1084 // methods cannot be collected while we hold a handle, | |
1085 // _prev_EMCP_methods should never have a length of zero. | |
1086 GrowableArray<methodHandle>* _prev_EMCP_method_handles; | |
1087 | |
1088 public: | |
1089 PreviousVersionInfo(PreviousVersionNode *pv_node); | |
1090 ~PreviousVersionInfo(); | |
1091 constantPoolHandle prev_constant_pool_handle() const { | |
1092 return _prev_constant_pool_handle; | |
1093 } | |
1094 GrowableArray<methodHandle>* prev_EMCP_method_handles() const { | |
1095 return _prev_EMCP_method_handles; | |
1096 } | |
1097 }; | |
1098 | |
1099 | |
1100 // Helper object for walking previous versions. This helper cleans up | |
1101 // the Handles that it allocates when the helper object is destroyed. | |
1102 // The PreviousVersionInfo object returned by next_previous_version() | |
1103 // is only valid until a subsequent call to next_previous_version() or | |
1104 // the helper object is destroyed. | |
1105 class PreviousVersionWalker : public StackObj { | |
1106 private: | |
1107 GrowableArray<PreviousVersionNode *>* _previous_versions; | |
1108 int _current_index; | |
1109 // Fields for cleaning up when we are done walking the previous versions: | |
1110 // A HandleMark for the PreviousVersionInfo handles: | |
1111 HandleMark _hm; | |
1112 | |
1113 // It would be nice to have a ResourceMark field in this helper also, | |
1114 // but the ResourceMark code says to be careful to delete handles held | |
1115 // in GrowableArrays _before_ deleting the GrowableArray. Since we | |
1116 // can't guarantee the order in which the fields are destroyed, we | |
1117 // have to let the creator of the PreviousVersionWalker object do | |
1118 // the right thing. Also, adding a ResourceMark here causes an | |
1119 // include loop. | |
1120 | |
1121 // A pointer to the current info object so we can handle the deletes. | |
1122 PreviousVersionInfo * _current_p; | |
1123 | |
1124 public: | |
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1125 PreviousVersionWalker(InstanceKlass *ik); |
0 | 1126 ~PreviousVersionWalker(); |
1127 | |
1128 // Return the interesting information for the next previous version | |
1129 // of the klass. Returns NULL if there are no more previous versions. | |
1130 PreviousVersionInfo* next_previous_version(); | |
1131 }; | |
1972 | 1132 |
3939 | 1133 |
1134 // | |
1135 // nmethodBucket is used to record dependent nmethods for | |
1136 // deoptimization. nmethod dependencies are actually <klass, method> | |
1137 // pairs but we really only care about the klass part for purposes of | |
1138 // finding nmethods which might need to be deoptimized. Instead of | |
1139 // recording the method, a count of how many times a particular nmethod | |
1140 // was recorded is kept. This ensures that any recording errors are | |
1141 // noticed since an nmethod should be removed as many times are it's | |
1142 // added. | |
1143 // | |
6197 | 1144 class nmethodBucket: public CHeapObj<mtClass> { |
3939 | 1145 friend class VMStructs; |
1146 private: | |
1147 nmethod* _nmethod; | |
1148 int _count; | |
1149 nmethodBucket* _next; | |
1150 | |
1151 public: | |
1152 nmethodBucket(nmethod* nmethod, nmethodBucket* next) { | |
1153 _nmethod = nmethod; | |
1154 _next = next; | |
1155 _count = 1; | |
1156 } | |
1157 int count() { return _count; } | |
1158 int increment() { _count += 1; return _count; } | |
1159 int decrement() { _count -= 1; assert(_count >= 0, "don't underflow"); return _count; } | |
1160 nmethodBucket* next() { return _next; } | |
1161 void set_next(nmethodBucket* b) { _next = b; } | |
1162 nmethod* get_nmethod() { return _nmethod; } | |
1163 }; | |
1164 | |
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1165 // An iterator that's used to access the inner classes indices in the |
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1166 // InstanceKlass::_inner_classes array. |
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1167 class InnerClassesIterator : public StackObj { |
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1168 private: |
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1169 Array<jushort>* _inner_classes; |
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1170 int _length; |
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1171 int _idx; |
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1172 public: |
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1173 |
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1174 InnerClassesIterator(instanceKlassHandle k) { |
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1175 _inner_classes = k->inner_classes(); |
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1176 if (k->inner_classes() != NULL) { |
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1177 _length = _inner_classes->length(); |
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1178 // The inner class array's length should be the multiple of |
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1179 // inner_class_next_offset if it only contains the InnerClasses |
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1180 // attribute data, or it should be |
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1181 // n*inner_class_next_offset+enclosing_method_attribute_size |
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1182 // if it also contains the EnclosingMethod data. |
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1183 assert((_length % InstanceKlass::inner_class_next_offset == 0 || |
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1184 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), |
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1185 "just checking"); |
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1186 // Remove the enclosing_method portion if exists. |
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1187 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { |
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1188 _length -= InstanceKlass::enclosing_method_attribute_size; |
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1189 } |
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1190 } else { |
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1191 _length = 0; |
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1192 } |
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1193 _idx = 0; |
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1194 } |
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1195 |
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1196 int length() const { |
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1197 return _length; |
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1198 } |
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1199 |
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1200 void next() { |
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1201 _idx += InstanceKlass::inner_class_next_offset; |
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1202 } |
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1203 |
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1204 bool done() const { |
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1205 return (_idx >= _length); |
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1206 } |
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1207 |
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1208 u2 inner_class_info_index() const { |
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1209 return _inner_classes->at( |
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1210 _idx + InstanceKlass::inner_class_inner_class_info_offset); |
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1211 } |
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1212 |
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1213 void set_inner_class_info_index(u2 index) { |
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1214 _inner_classes->at_put( |
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1215 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); |
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1216 } |
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1217 |
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1218 u2 outer_class_info_index() const { |
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1219 return _inner_classes->at( |
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1220 _idx + InstanceKlass::inner_class_outer_class_info_offset); |
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1221 } |
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1222 |
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1223 void set_outer_class_info_index(u2 index) { |
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1224 _inner_classes->at_put( |
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1225 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); |
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1226 } |
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1227 |
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1228 u2 inner_name_index() const { |
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1229 return _inner_classes->at( |
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1230 _idx + InstanceKlass::inner_class_inner_name_offset); |
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1231 } |
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1232 |
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1233 void set_inner_name_index(u2 index) { |
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1234 _inner_classes->at_put( |
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1235 _idx + InstanceKlass::inner_class_inner_name_offset, index); |
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1236 } |
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1237 |
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1238 u2 inner_access_flags() const { |
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1239 return _inner_classes->at( |
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1240 _idx + InstanceKlass::inner_class_access_flags_offset); |
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1241 } |
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1242 }; |
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1243 |
1972 | 1244 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP |