Mercurial > hg > truffle
annotate src/share/vm/oops/instanceKlass.hpp @ 7459:cc6a617fffd2
8005494: SIGSEGV in Rewriter::relocate_and_link() when testing Weblogic with CompressedOops and KlassPtrs
Summary: Relocate functions with jsr's when rewriting so not repeated after reading shared archive
Reviewed-by: twisti, jrose
author | coleenp |
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date | Wed, 02 Jan 2013 20:28:09 -0500 |
parents | 35431a769282 |
children | 37a3e8b7a1e9 |
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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 friend class CompileReplay; |
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137 |
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138 protected: |
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139 // Constructor |
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140 InstanceKlass(int vtable_len, |
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141 int itable_len, |
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142 int static_field_size, |
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143 int nonstatic_oop_map_size, |
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144 ReferenceType rt, |
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145 AccessFlags access_flags, |
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146 bool is_anonymous); |
0 | 147 public: |
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148 static Klass* allocate_instance_klass(ClassLoaderData* loader_data, |
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149 int vtable_len, |
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150 int itable_len, |
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151 int static_field_size, |
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152 int nonstatic_oop_map_size, |
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153 ReferenceType rt, |
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154 AccessFlags access_flags, |
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155 Symbol* name, |
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156 Klass* super_klass, |
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157 KlassHandle host_klass, |
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158 TRAPS); |
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159 |
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160 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } |
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161 |
0 | 162 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description |
163 // of the class loading & initialization procedure, and the use of the states. | |
164 enum ClassState { | |
165 allocated, // allocated (but not yet linked) | |
166 loaded, // loaded and inserted in class hierarchy (but not linked yet) | |
167 linked, // successfully linked/verified (but not initialized yet) | |
168 being_initialized, // currently running class initializer | |
169 fully_initialized, // initialized (successfull final state) | |
170 initialization_error // error happened during initialization | |
171 }; | |
172 | |
173 protected: | |
174 // Protection domain. | |
175 oop _protection_domain; | |
176 // Class signers. | |
177 objArrayOop _signers; | |
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178 // Initialization lock. Must be one per class and it has to be a VM internal |
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179 // object so java code cannot lock it (like the mirror) |
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180 // It has to be an object not a Mutex because it's held through java calls. |
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181 volatile oop _init_lock; |
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182 |
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183 // Annotations for this class |
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184 Annotations* _annotations; |
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185 // Array classes holding elements of this class. |
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186 Klass* _array_klasses; |
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187 // Constant pool for this class. |
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188 ConstantPool* _constants; |
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189 // The InnerClasses attribute and EnclosingMethod attribute. The |
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190 // _inner_classes is an array of shorts. If the class has InnerClasses |
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191 // attribute, then the _inner_classes array begins with 4-tuples of shorts |
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192 // [inner_class_info_index, outer_class_info_index, |
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193 // inner_name_index, inner_class_access_flags] for the InnerClasses |
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194 // attribute. If the EnclosingMethod attribute exists, it occupies the |
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195 // last two shorts [class_index, method_index] of the array. If only |
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196 // the InnerClasses attribute exists, the _inner_classes array length is |
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197 // number_of_inner_classes * 4. If the class has both InnerClasses |
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198 // and EnclosingMethod attributes the _inner_classes array length is |
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199 // number_of_inner_classes * 4 + enclosing_method_attribute_size. |
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200 Array<jushort>* _inner_classes; |
0 | 201 |
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202 // Name of source file containing this klass, NULL if not specified. |
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203 Symbol* _source_file_name; |
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204 // the source debug extension for this klass, NULL if not specified. |
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205 // Specified as UTF-8 string without terminating zero byte in the classfile, |
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206 // it is stored in the instanceklass as a NULL-terminated UTF-8 string |
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207 char* _source_debug_extension; |
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208 // Generic signature, or null if none. |
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209 Symbol* _generic_signature; |
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210 // Array name derived from this class which needs unreferencing |
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211 // if this class is unloaded. |
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212 Symbol* _array_name; |
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213 |
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214 // Number of heapOopSize words used by non-static fields in this klass |
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215 // (including inherited fields but after header_size()). |
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216 int _nonstatic_field_size; |
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217 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass |
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218 u2 _static_oop_field_count;// number of static oop fields in this klass |
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219 u2 _java_fields_count; // The number of declared Java fields |
938 | 220 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks |
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221 |
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222 bool _is_marked_dependent; // used for marking during flushing and deoptimization |
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223 enum { |
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224 _misc_rewritten = 1 << 0, // methods rewritten. |
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225 _misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops |
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226 _misc_should_verify_class = 1 << 2, // allow caching of preverification |
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227 _misc_is_anonymous = 1 << 3 // has embedded _inner_classes field |
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228 }; |
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229 u2 _misc_flags; |
0 | 230 u2 _minor_version; // minor version number of class file |
231 u2 _major_version; // major version number of class file | |
232 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization) | |
233 int _vtable_len; // length of Java vtable (in words) | |
234 int _itable_len; // length of Java itable (in words) | |
235 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) | |
236 JNIid* _jni_ids; // First JNI identifier for static fields in this class | |
237 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none | |
238 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL | |
239 nmethodBucket* _dependencies; // list of dependent nmethods | |
240 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class | |
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241 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* |
0 | 242 // Array of interesting part(s) of the previous version(s) of this |
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243 // InstanceKlass. See PreviousVersionWalker below. |
0 | 244 GrowableArray<PreviousVersionNode *>* _previous_versions; |
245 // JVMTI fields can be moved to their own structure - see 6315920 | |
246 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH | |
247 jint _cached_class_file_len; // JVMTI: length of above | |
248 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration | |
6934 | 249 |
250 // true if class, superclass, or implemented interfaces have default methods | |
251 bool _has_default_methods; | |
252 | |
0 | 253 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change |
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254 // Method array. |
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255 Array<Method*>* _methods; |
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256 // Interface (Klass*s) this class declares locally to implement. |
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257 Array<Klass*>* _local_interfaces; |
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258 // Interface (Klass*s) this class implements transitively. |
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259 Array<Klass*>* _transitive_interfaces; |
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260 // Int array containing the original order of method in the class file (for JVMTI). |
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261 Array<int>* _method_ordering; |
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262 // Instance and static variable information, starts with 6-tuples of shorts |
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263 // [access, name index, sig index, initval index, low_offset, high_offset] |
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264 // for all fields, followed by the generic signature data at the end of |
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265 // the array. Only fields with generic signature attributes have the generic |
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266 // signature data set in the array. The fields array looks like following: |
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267 // |
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268 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] |
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269 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] |
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270 // ... |
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271 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] |
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272 // [generic signature index] |
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273 // [generic signature index] |
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274 // ... |
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275 Array<u2>* _fields; |
0 | 276 |
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277 // Class states are defined as ClassState (see above). |
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278 // Place the _init_state here to utilize the unused 2-byte after |
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279 // _idnum_allocated_count. |
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280 u1 _init_state; // state of class |
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281 |
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282 u1 _reference_type; // reference type |
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283 |
0 | 284 // embedded Java vtable follows here |
285 // embedded Java itables follows here | |
286 // embedded static fields follows here | |
287 // embedded nonstatic oop-map blocks follows here | |
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288 // embedded implementor of this interface follows here |
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289 // The embedded implementor only exists if the current klass is an |
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290 // iterface. The possible values of the implementor fall into following |
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291 // three cases: |
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292 // NULL: no implementor. |
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293 // A Klass* that's not itself: one implementor. |
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294 // Itsef: more than one implementors. |
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295 // embedded host klass follows here |
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296 // The embedded host klass only exists in an anonymous class for |
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297 // dynamic language support (JSR 292 enabled). The host class grants |
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298 // its access privileges to this class also. The host class is either |
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299 // named, or a previously loaded anonymous class. A non-anonymous class |
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300 // or an anonymous class loaded through normal classloading does not |
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301 // have this embedded field. |
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302 // |
0 | 303 |
304 friend class SystemDictionary; | |
305 | |
306 public: | |
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307 bool has_nonstatic_fields() const { |
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308 return (_misc_flags & _misc_has_nonstatic_fields) != 0; |
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309 } |
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310 void set_has_nonstatic_fields(bool b) { |
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311 if (b) { |
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312 _misc_flags |= _misc_has_nonstatic_fields; |
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313 } else { |
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314 _misc_flags &= ~_misc_has_nonstatic_fields; |
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315 } |
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316 } |
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317 |
0 | 318 // field sizes |
319 int nonstatic_field_size() const { return _nonstatic_field_size; } | |
320 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } | |
321 | |
322 int static_field_size() const { return _static_field_size; } | |
323 void set_static_field_size(int size) { _static_field_size = size; } | |
324 | |
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325 int static_oop_field_count() const { return (int)_static_oop_field_count; } |
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326 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } |
0 | 327 |
328 // Java vtable | |
329 int vtable_length() const { return _vtable_len; } | |
330 void set_vtable_length(int len) { _vtable_len = len; } | |
331 | |
332 // Java itable | |
333 int itable_length() const { return _itable_len; } | |
334 void set_itable_length(int len) { _itable_len = len; } | |
335 | |
336 // array klasses | |
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337 Klass* array_klasses() const { return _array_klasses; } |
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338 void set_array_klasses(Klass* k) { _array_klasses = k; } |
0 | 339 |
340 // methods | |
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341 Array<Method*>* methods() const { return _methods; } |
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342 void set_methods(Array<Method*>* a) { _methods = a; } |
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343 Method* method_with_idnum(int idnum); |
0 | 344 |
345 // method ordering | |
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346 Array<int>* method_ordering() const { return _method_ordering; } |
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347 void set_method_ordering(Array<int>* m) { _method_ordering = m; } |
0 | 348 |
349 // interfaces | |
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350 Array<Klass*>* local_interfaces() const { return _local_interfaces; } |
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351 void set_local_interfaces(Array<Klass*>* a) { |
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352 guarantee(_local_interfaces == NULL || a == NULL, "Just checking"); |
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353 _local_interfaces = a; } |
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354 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; } |
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355 void set_transitive_interfaces(Array<Klass*>* a) { |
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356 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking"); |
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357 _transitive_interfaces = a; } |
0 | 358 |
3938 | 359 private: |
360 friend class fieldDescriptor; | |
361 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } | |
362 | |
363 public: | |
364 int field_offset (int index) const { return field(index)->offset(); } | |
365 int field_access_flags(int index) const { return field(index)->access_flags(); } | |
366 Symbol* field_name (int index) const { return field(index)->name(constants()); } | |
367 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } | |
368 | |
369 // Number of Java declared fields | |
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370 int java_fields_count() const { return (int)_java_fields_count; } |
3938 | 371 |
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372 Array<u2>* fields() const { return _fields; } |
3938 | 373 |
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374 void set_fields(Array<u2>* f, u2 java_fields_count) { |
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375 guarantee(_fields == NULL || f == NULL, "Just checking"); |
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376 _fields = f; |
3938 | 377 _java_fields_count = java_fields_count; |
0 | 378 } |
379 | |
380 // inner classes | |
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381 Array<u2>* inner_classes() const { return _inner_classes; } |
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382 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } |
0 | 383 |
384 enum InnerClassAttributeOffset { | |
385 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 | |
386 inner_class_inner_class_info_offset = 0, | |
387 inner_class_outer_class_info_offset = 1, | |
388 inner_class_inner_name_offset = 2, | |
389 inner_class_access_flags_offset = 3, | |
390 inner_class_next_offset = 4 | |
391 }; | |
392 | |
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393 enum EnclosingMethodAttributeOffset { |
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394 enclosing_method_class_index_offset = 0, |
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395 enclosing_method_method_index_offset = 1, |
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396 enclosing_method_attribute_size = 2 |
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397 }; |
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398 |
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399 // method override check |
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400 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); |
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401 |
0 | 402 // package |
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403 bool is_same_class_package(Klass* class2); |
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404 bool is_same_class_package(oop classloader2, Symbol* classname2); |
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405 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2); |
0 | 406 |
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407 // find an enclosing class (defined where original code was, in jvm.cpp!) |
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408 Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) { |
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409 instanceKlassHandle self(THREAD, this); |
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410 return compute_enclosing_class_impl(self, inner_is_member, THREAD); |
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411 } |
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412 static Klass* compute_enclosing_class_impl(instanceKlassHandle self, |
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413 bool* inner_is_member, TRAPS); |
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414 |
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415 // tell if two classes have the same enclosing class (at package level) |
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416 bool is_same_package_member(Klass* class2, TRAPS) { |
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417 instanceKlassHandle self(THREAD, this); |
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418 return is_same_package_member_impl(self, class2, THREAD); |
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419 } |
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420 static bool is_same_package_member_impl(instanceKlassHandle self, |
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421 Klass* class2, TRAPS); |
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422 |
0 | 423 // initialization state |
424 bool is_loaded() const { return _init_state >= loaded; } | |
425 bool is_linked() const { return _init_state >= linked; } | |
426 bool is_initialized() const { return _init_state == fully_initialized; } | |
427 bool is_not_initialized() const { return _init_state < being_initialized; } | |
428 bool is_being_initialized() const { return _init_state == being_initialized; } | |
429 bool is_in_error_state() const { return _init_state == initialization_error; } | |
430 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } | |
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431 ClassState init_state() { return (ClassState)_init_state; } |
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432 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; } |
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433 |
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434 // defineClass specified verification |
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435 bool should_verify_class() const { |
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436 return (_misc_flags & _misc_should_verify_class) != 0; |
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437 } |
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438 void set_should_verify_class(bool value) { |
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439 if (value) { |
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440 _misc_flags |= _misc_should_verify_class; |
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441 } else { |
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442 _misc_flags &= ~_misc_should_verify_class; |
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443 } |
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444 } |
0 | 445 |
446 // marking | |
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447 bool is_marked_dependent() const { return _is_marked_dependent; } |
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448 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } |
0 | 449 |
450 // initialization (virtuals from Klass) | |
451 bool should_be_initialized() const; // means that initialize should be called | |
452 void initialize(TRAPS); | |
453 void link_class(TRAPS); | |
454 bool link_class_or_fail(TRAPS); // returns false on failure | |
455 void unlink_class(); | |
456 void rewrite_class(TRAPS); | |
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457 void link_methods(TRAPS); |
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458 Method* class_initializer(); |
0 | 459 |
460 // set the class to initialized if no static initializer is present | |
461 void eager_initialize(Thread *thread); | |
462 | |
463 // reference type | |
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464 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } |
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465 void set_reference_type(ReferenceType t) { |
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466 assert(t == (u1)t, "overflow"); |
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467 _reference_type = (u1)t; |
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468 } |
0 | 469 |
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470 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); } |
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471 |
0 | 472 // find local field, returns true if found |
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473 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; |
0 | 474 // find field in direct superinterfaces, returns the interface in which the field is defined |
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475 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; |
0 | 476 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined |
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477 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; |
0 | 478 // 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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479 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; |
0 | 480 |
481 // find a non-static or static field given its offset within the class. | |
482 bool contains_field_offset(int offset) { | |
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483 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); |
0 | 484 } |
485 | |
486 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; | |
487 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; | |
488 | |
489 // find a local method (returns NULL if not found) | |
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490 Method* find_method(Symbol* name, Symbol* signature) const; |
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491 static Method* find_method(Array<Method*>* methods, Symbol* name, Symbol* signature); |
0 | 492 |
493 // lookup operation (returns NULL if not found) | |
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494 Method* uncached_lookup_method(Symbol* name, Symbol* signature) const; |
0 | 495 |
496 // lookup a method in all the interfaces that this class implements | |
497 // (returns NULL if not found) | |
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498 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature) const; |
0 | 499 |
6934 | 500 // Find method indices by name. If a method with the specified name is |
501 // found the index to the first method is returned, and 'end' is filled in | |
502 // with the index of first non-name-matching method. If no method is found | |
503 // -1 is returned. | |
504 int find_method_by_name(Symbol* name, int* end); | |
505 static int find_method_by_name(Array<Method*>* methods, Symbol* name, int* end); | |
506 | |
0 | 507 // constant pool |
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508 ConstantPool* constants() const { return _constants; } |
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509 void set_constants(ConstantPool* c) { _constants = c; } |
0 | 510 |
511 // protection domain | |
512 oop protection_domain() { return _protection_domain; } | |
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513 void set_protection_domain(oop pd) { klass_oop_store(&_protection_domain, pd); } |
0 | 514 |
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515 // host class |
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516 Klass* host_klass() const { |
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517 Klass** hk = (Klass**)adr_host_klass(); |
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518 if (hk == NULL) { |
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519 return NULL; |
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520 } else { |
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521 return *hk; |
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522 } |
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523 } |
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524 void set_host_klass(Klass* host) { |
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525 assert(is_anonymous(), "not anonymous"); |
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526 Klass** addr = (Klass**)adr_host_klass(); |
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527 assert(addr != NULL, "no reversed space"); |
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528 *addr = host; |
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529 } |
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530 bool is_anonymous() const { |
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531 return (_misc_flags & _misc_is_anonymous) != 0; |
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532 } |
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533 void set_is_anonymous(bool value) { |
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534 if (value) { |
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535 _misc_flags |= _misc_is_anonymous; |
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536 } else { |
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537 _misc_flags &= ~_misc_is_anonymous; |
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538 } |
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539 } |
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540 |
7409 | 541 // Oop that keeps the metadata for this class from being unloaded |
542 // in places where the metadata is stored in other places, like nmethods | |
543 oop klass_holder() const { | |
544 return is_anonymous() ? java_mirror() : class_loader(); | |
545 } | |
546 | |
0 | 547 // signers |
548 objArrayOop signers() const { return _signers; } | |
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549 void set_signers(objArrayOop s) { klass_oop_store((oop*)&_signers, s); } |
0 | 550 |
551 // source file name | |
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552 Symbol* source_file_name() const { return _source_file_name; } |
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553 void set_source_file_name(Symbol* n); |
0 | 554 |
555 // minor and major version numbers of class file | |
556 u2 minor_version() const { return _minor_version; } | |
557 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } | |
558 u2 major_version() const { return _major_version; } | |
559 void set_major_version(u2 major_version) { _major_version = major_version; } | |
560 | |
561 // source debug extension | |
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562 char* source_debug_extension() const { return _source_debug_extension; } |
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563 void set_source_debug_extension(char* array, int length); |
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564 |
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565 // symbol unloading support (refcount already added) |
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566 Symbol* array_name() { return _array_name; } |
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567 void set_array_name(Symbol* name) { assert(_array_name == NULL, "name already created"); _array_name = name; } |
0 | 568 |
569 // nonstatic oop-map blocks | |
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570 static int nonstatic_oop_map_size(unsigned int oop_map_count) { |
938 | 571 return oop_map_count * OopMapBlock::size_in_words(); |
572 } | |
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573 unsigned int nonstatic_oop_map_count() const { |
938 | 574 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); |
575 } | |
576 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } | |
577 void set_nonstatic_oop_map_size(int words) { | |
578 _nonstatic_oop_map_size = words; | |
579 } | |
0 | 580 |
581 // RedefineClasses() support for previous versions: | |
582 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods, | |
583 int emcp_method_count); | |
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584 // If the _previous_versions array is non-NULL, then this klass |
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585 // has been redefined at least once even if we aren't currently |
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586 // tracking a previous version. |
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587 bool has_been_redefined() const { return _previous_versions != NULL; } |
0 | 588 bool has_previous_version() const; |
589 void init_previous_versions() { | |
590 _previous_versions = NULL; | |
591 } | |
592 GrowableArray<PreviousVersionNode *>* previous_versions() const { | |
593 return _previous_versions; | |
594 } | |
595 | |
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596 static void purge_previous_versions(InstanceKlass* ik); |
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597 |
0 | 598 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation |
599 void set_cached_class_file(unsigned char *class_file_bytes, | |
600 jint class_file_len) { _cached_class_file_len = class_file_len; | |
601 _cached_class_file_bytes = class_file_bytes; } | |
602 jint get_cached_class_file_len() { return _cached_class_file_len; } | |
603 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; } | |
604 | |
605 // JVMTI: Support for caching of field indices, types, and offsets | |
606 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { | |
607 _jvmti_cached_class_field_map = descriptor; | |
608 } | |
609 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { | |
610 return _jvmti_cached_class_field_map; | |
611 } | |
612 | |
6934 | 613 bool has_default_methods() const { return _has_default_methods; } |
614 void set_has_default_methods(bool b) { _has_default_methods = b; } | |
615 | |
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616 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available |
0 | 617 inline u2 next_method_idnum(); |
618 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } | |
619 | |
620 // generics support | |
2177
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621 Symbol* generic_signature() const { return _generic_signature; } |
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622 void set_generic_signature(Symbol* sig) { _generic_signature = sig; } |
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623 |
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624 u2 enclosing_method_data(int offset); |
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625 u2 enclosing_method_class_index() { |
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626 return enclosing_method_data(enclosing_method_class_index_offset); |
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627 } |
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628 u2 enclosing_method_method_index() { |
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629 return enclosing_method_data(enclosing_method_method_index_offset); |
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630 } |
0 | 631 void set_enclosing_method_indices(u2 class_index, |
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632 u2 method_index); |
0 | 633 |
634 // jmethodID support | |
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635 static jmethodID get_jmethod_id(instanceKlassHandle ik_h, |
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636 methodHandle method_h); |
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637 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h, |
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638 size_t idnum, jmethodID new_id, jmethodID* new_jmeths, |
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639 jmethodID* to_dealloc_id_p, |
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640 jmethodID** to_dealloc_jmeths_p); |
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641 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, |
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642 size_t *length_p, jmethodID* id_p); |
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643 jmethodID jmethod_id_or_null(Method* method); |
0 | 644 |
645 // cached itable index support | |
646 void set_cached_itable_index(size_t idnum, int index); | |
647 int cached_itable_index(size_t idnum); | |
648 | |
649 // annotations support | |
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650 Annotations* annotations() const { return _annotations; } |
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651 void set_annotations(Annotations* anno) { _annotations = anno; } |
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652 AnnotationArray* class_annotations() const { |
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653 if (annotations() == NULL) return NULL; |
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654 return annotations()->class_annotations(); |
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655 } |
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656 Array<AnnotationArray*>* fields_annotations() const { |
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657 if (annotations() == NULL) return NULL; |
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658 return annotations()->fields_annotations(); |
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659 } |
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660 Annotations* type_annotations() const { |
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661 if (annotations() == NULL) return NULL; |
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662 return annotations()->type_annotations(); |
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663 } |
0 | 664 |
665 // allocation | |
666 instanceOop allocate_instance(TRAPS); | |
667 | |
668 // additional member function to return a handle | |
669 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); } | |
670 | |
671 objArrayOop allocate_objArray(int n, int length, TRAPS); | |
672 // Helper function | |
673 static instanceOop register_finalizer(instanceOop i, TRAPS); | |
674 | |
675 // Check whether reflection/jni/jvm code is allowed to instantiate this class; | |
676 // if not, throw either an Error or an Exception. | |
677 virtual void check_valid_for_instantiation(bool throwError, TRAPS); | |
678 | |
679 // initialization | |
680 void call_class_initializer(TRAPS); | |
681 void set_initialization_state_and_notify(ClassState state, TRAPS); | |
682 | |
683 // OopMapCache support | |
684 OopMapCache* oop_map_cache() { return _oop_map_cache; } | |
685 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } | |
686 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry); | |
687 | |
688 // JNI identifier support (for static fields - for jni performance) | |
689 JNIid* jni_ids() { return _jni_ids; } | |
690 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } | |
691 JNIid* jni_id_for(int offset); | |
692 | |
693 // maintenance of deoptimization dependencies | |
694 int mark_dependent_nmethods(DepChange& changes); | |
695 void add_dependent_nmethod(nmethod* nm); | |
696 void remove_dependent_nmethod(nmethod* nm); | |
697 | |
698 // On-stack replacement support | |
699 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; | |
700 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; | |
701 void add_osr_nmethod(nmethod* n); | |
702 void remove_osr_nmethod(nmethod* n); | |
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703 nmethod* lookup_osr_nmethod(Method* const m, int bci, int level, bool match_level) const; |
0 | 704 |
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705 // Breakpoint support (see methods on Method* for details) |
0 | 706 BreakpointInfo* breakpoints() const { return _breakpoints; }; |
707 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; | |
708 | |
709 // support for stub routines | |
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710 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } |
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711 TRACE_DEFINE_OFFSET; |
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712 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } |
0 | 713 |
714 // subclass/subinterface checks | |
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715 bool implements_interface(Klass* k) const; |
0 | 716 |
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717 // Access to the implementor of an interface. |
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718 Klass* implementor() const |
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719 { |
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720 Klass** k = adr_implementor(); |
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721 if (k == NULL) { |
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722 return NULL; |
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723 } else { |
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724 return *k; |
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725 } |
0 | 726 } |
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727 |
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728 void set_implementor(Klass* k) { |
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729 assert(is_interface(), "not interface"); |
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730 Klass** addr = adr_implementor(); |
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731 *addr = k; |
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732 } |
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733 |
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734 int nof_implementors() const { |
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735 Klass* k = implementor(); |
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736 if (k == NULL) { |
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737 return 0; |
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738 } else if (k != this) { |
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739 return 1; |
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740 } else { |
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741 return 2; |
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742 } |
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743 } |
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744 |
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745 void add_implementor(Klass* k); // k is a new class that implements this interface |
0 | 746 void init_implementor(); // initialize |
747 | |
748 // link this class into the implementors list of every interface it implements | |
749 void process_interfaces(Thread *thread); | |
750 | |
751 // virtual operations from Klass | |
752 bool is_leaf_class() const { return _subklass == NULL; } | |
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753 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots); |
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754 bool compute_is_subtype_of(Klass* k); |
0 | 755 bool can_be_primary_super_slow() const; |
756 int oop_size(oop obj) const { return size_helper(); } | |
757 bool oop_is_instance_slow() const { return true; } | |
758 | |
759 // Iterators | |
760 void do_local_static_fields(FieldClosure* cl); | |
761 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields | |
762 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS); | |
763 | |
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764 void methods_do(void f(Method* method)); |
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765 void array_klasses_do(void f(Klass* k)); |
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766 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); |
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767 void with_array_klasses_do(void f(Klass* k)); |
0 | 768 bool super_types_do(SuperTypeClosure* blk); |
769 | |
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770 // Casting from Klass* |
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771 static InstanceKlass* cast(Klass* k) { |
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772 assert(k->is_klass(), "must be"); |
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773 assert(k->oop_is_instance(), "cast to InstanceKlass"); |
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774 return (InstanceKlass*) k; |
0 | 775 } |
776 | |
6934 | 777 InstanceKlass* java_super() const { |
778 return (super() == NULL) ? NULL : cast(super()); | |
779 } | |
780 | |
0 | 781 // Sizing (in words) |
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782 static int header_size() { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); } |
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783 static int size(int vtable_length, int itable_length, |
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784 int nonstatic_oop_map_size, |
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785 bool is_interface, bool is_anonymous) { |
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786 return align_object_size(header_size() + |
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787 align_object_offset(vtable_length) + |
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788 align_object_offset(itable_length) + |
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789 ((is_interface || is_anonymous) ? |
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790 align_object_offset(nonstatic_oop_map_size) : |
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791 nonstatic_oop_map_size) + |
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792 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) + |
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793 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0)); |
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794 } |
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795 int size() const { return size(vtable_length(), |
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796 itable_length(), |
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797 nonstatic_oop_map_size(), |
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798 is_interface(), |
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799 is_anonymous()); |
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800 } |
5998
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801 |
0 | 802 static int vtable_start_offset() { return header_size(); } |
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803 static int vtable_length_offset() { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; } |
0 | 804 |
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805 intptr_t* start_of_vtable() const { return ((intptr_t*)this) + vtable_start_offset(); } |
0 | 806 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); } |
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807 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; } |
0 | 808 |
809 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } | |
810 | |
2376
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811 address static_field_addr(int offset); |
113
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812 |
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813 OopMapBlock* start_of_nonstatic_oop_maps() const { |
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814 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length())); |
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815 } |
0 | 816 |
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817 Klass** adr_implementor() const { |
5998
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818 if (is_interface()) { |
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819 return (Klass**)(start_of_nonstatic_oop_maps() + |
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820 nonstatic_oop_map_count()); |
5998
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821 } else { |
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822 return NULL; |
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823 } |
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824 }; |
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825 |
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826 Klass** adr_host_klass() const { |
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827 if (is_anonymous()) { |
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828 Klass** adr_impl = adr_implementor(); |
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829 if (adr_impl != NULL) { |
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830 return adr_impl + 1; |
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831 } else { |
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832 return (Klass**)(start_of_nonstatic_oop_maps() + |
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833 nonstatic_oop_map_count()); |
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834 } |
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835 } else { |
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836 return NULL; |
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837 } |
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838 } |
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839 |
0 | 840 // Allocation profiling support |
841 juint alloc_size() const { return _alloc_count * size_helper(); } | |
842 void set_alloc_size(juint n) {} | |
843 | |
844 // Use this to return the size of an instance in heap words: | |
845 int size_helper() const { | |
846 return layout_helper_to_size_helper(layout_helper()); | |
847 } | |
848 | |
849 // This bit is initialized in classFileParser.cpp. | |
850 // It is false under any of the following conditions: | |
851 // - the class is abstract (including any interface) | |
852 // - the class has a finalizer (if !RegisterFinalizersAtInit) | |
853 // - the class size is larger than FastAllocateSizeLimit | |
854 // - the class is java/lang/Class, which cannot be allocated directly | |
855 bool can_be_fastpath_allocated() const { | |
856 return !layout_helper_needs_slow_path(layout_helper()); | |
857 } | |
858 | |
859 // Java vtable/itable | |
860 klassVtable* vtable() const; // return new klassVtable wrapper | |
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861 inline Method* method_at_vtable(int index); |
0 | 862 klassItable* itable() const; // return new klassItable wrapper |
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863 Method* method_at_itable(Klass* holder, int index, TRAPS); |
0 | 864 |
865 // Garbage collection | |
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866 virtual void oops_do(OopClosure* cl); |
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867 |
0 | 868 void oop_follow_contents(oop obj); |
869 int oop_adjust_pointers(oop obj); | |
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870 |
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871 void clean_implementors_list(BoolObjectClosure* is_alive); |
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872 void clean_method_data(BoolObjectClosure* is_alive); |
0 | 873 |
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874 // Explicit metaspace deallocation of fields |
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875 // For RedefineClasses, we need to deallocate instanceKlasses |
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876 void deallocate_contents(ClassLoaderData* loader_data); |
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877 |
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878 // The constant pool is on stack if any of the methods are executing or |
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879 // referenced by handles. |
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880 bool on_stack() const { return _constants->on_stack(); } |
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881 |
0 | 882 void release_C_heap_structures(); |
883 | |
884 // Parallel Scavenge and Parallel Old | |
885 PARALLEL_GC_DECLS | |
886 | |
887 // Naming | |
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888 const char* signature_name() const; |
0 | 889 |
890 // Iterators | |
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891 int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) { |
0 | 892 return oop_oop_iterate_v(obj, blk); |
893 } | |
894 | |
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895 int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) { |
0 | 896 return oop_oop_iterate_v_m(obj, blk, mr); |
897 } | |
898 | |
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899 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ |
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900 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ |
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901 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \ |
0 | 902 MemRegion mr); |
903 | |
904 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL) | |
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905 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL) |
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906 |
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907 #ifndef SERIALGC |
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908 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ |
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909 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk); |
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910 |
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911 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
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912 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
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913 #endif // !SERIALGC |
0 | 914 |
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915 u2 idnum_allocated_count() const { return _idnum_allocated_count; } |
0 | 916 private: |
917 // initialization state | |
918 #ifdef ASSERT | |
919 void set_init_state(ClassState state); | |
920 #else | |
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921 void set_init_state(ClassState state) { _init_state = (u1)state; } |
0 | 922 #endif |
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923 void set_rewritten() { _misc_flags |= _misc_rewritten; } |
0 | 924 void set_init_thread(Thread *thread) { _init_thread = thread; } |
925 | |
977
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926 // The RedefineClasses() API can cause new method idnums to be needed |
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927 // which will cause the caches to grow. Safety requires different |
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928 // cache management logic if the caches can grow instead of just |
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929 // going from NULL to non-NULL. |
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930 bool idnum_can_increment() const { return has_been_redefined(); } |
0 | 931 jmethodID* methods_jmethod_ids_acquire() const |
932 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); } | |
933 void release_set_methods_jmethod_ids(jmethodID* jmeths) | |
934 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); } | |
935 | |
936 int* methods_cached_itable_indices_acquire() const | |
937 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); } | |
938 void release_set_methods_cached_itable_indices(int* indices) | |
939 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); } | |
940 | |
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941 // Lock during initialization |
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942 volatile oop init_lock() const; |
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943 void set_init_lock(oop value) { klass_oop_store(&_init_lock, value); } |
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944 void fence_and_clear_init_lock(); // after fully_initialized |
0 | 945 |
946 // Offsets for memory management | |
947 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;} | |
948 oop* adr_signers() const { return (oop*)&this->_signers;} | |
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949 oop* adr_init_lock() const { return (oop*)&this->_init_lock;} |
0 | 950 |
951 // Static methods that are used to implement member methods where an exposed this pointer | |
952 // is needed due to possible GCs | |
953 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); | |
954 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); | |
955 static void initialize_impl (instanceKlassHandle this_oop, TRAPS); | |
956 static void eager_initialize_impl (instanceKlassHandle this_oop); | |
957 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS); | |
958 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS); | |
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959 static Klass* array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS); |
0 | 960 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS); |
961 /* jni_id_for_impl for jfieldID only */ | |
962 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset); | |
963 | |
964 // Returns the array class for the n'th dimension | |
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965 Klass* array_klass_impl(bool or_null, int n, TRAPS); |
0 | 966 |
967 // Returns the array class with this class as element type | |
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968 Klass* array_klass_impl(bool or_null, TRAPS); |
0 | 969 |
970 public: | |
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971 // CDS support - remove and restore oops from metadata. Oops are not shared. |
0 | 972 virtual void remove_unshareable_info(); |
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973 virtual void restore_unshareable_info(TRAPS); |
0 | 974 |
975 // jvm support | |
976 jint compute_modifier_flags(TRAPS) const; | |
977 | |
978 public: | |
979 // JVMTI support | |
980 jint jvmti_class_status() const; | |
981 | |
982 public: | |
983 // Printing | |
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984 #ifndef PRODUCT |
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985 void print_on(outputStream* st) const; |
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986 #endif |
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987 void print_value_on(outputStream* st) const; |
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988 |
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989 void oop_print_value_on(oop obj, outputStream* st); |
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990 |
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991 #ifndef PRODUCT |
0 | 992 void oop_print_on (oop obj, outputStream* st); |
993 | |
994 void print_dependent_nmethods(bool verbose = false); | |
995 bool is_dependent_nmethod(nmethod* nm); | |
996 #endif | |
997 | |
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998 const char* internal_name() const; |
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999 |
0 | 1000 // Verification |
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1001 void verify_on(outputStream* st); |
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1002 |
0 | 1003 void oop_verify_on(oop obj, outputStream* st); |
1004 }; | |
1005 | |
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1006 inline Method* InstanceKlass::method_at_vtable(int index) { |
0 | 1007 #ifndef PRODUCT |
1008 assert(index >= 0, "valid vtable index"); | |
1009 if (DebugVtables) { | |
1010 verify_vtable_index(index); | |
1011 } | |
1012 #endif | |
1013 vtableEntry* ve = (vtableEntry*)start_of_vtable(); | |
1014 return ve[index].method(); | |
1015 } | |
1016 | |
1017 // for adding methods | |
1018 // UNSET_IDNUM return means no more ids available | |
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1019 inline u2 InstanceKlass::next_method_idnum() { |
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1020 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { |
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1021 return ConstMethod::UNSET_IDNUM; // no more ids available |
0 | 1022 } else { |
1023 return _idnum_allocated_count++; | |
1024 } | |
1025 } | |
1026 | |
1027 | |
1028 /* JNIid class for jfieldIDs only */ | |
6197 | 1029 class JNIid: public CHeapObj<mtClass> { |
0 | 1030 friend class VMStructs; |
1031 private: | |
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1032 Klass* _holder; |
0 | 1033 JNIid* _next; |
1034 int _offset; | |
1035 #ifdef ASSERT | |
1036 bool _is_static_field_id; | |
1037 #endif | |
1038 | |
1039 public: | |
1040 // Accessors | |
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1041 Klass* holder() const { return _holder; } |
0 | 1042 int offset() const { return _offset; } |
1043 JNIid* next() { return _next; } | |
1044 // Constructor | |
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1045 JNIid(Klass* holder, int offset, JNIid* next); |
0 | 1046 // Identifier lookup |
1047 JNIid* find(int offset); | |
1048 | |
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1049 bool find_local_field(fieldDescriptor* fd) { |
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1050 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); |
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1051 } |
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1052 |
0 | 1053 static void deallocate(JNIid* id); |
1054 // Debugging | |
1055 #ifdef ASSERT | |
1056 bool is_static_field_id() const { return _is_static_field_id; } | |
1057 void set_is_static_field_id() { _is_static_field_id = true; } | |
1058 #endif | |
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1059 void verify(Klass* holder); |
0 | 1060 }; |
1061 | |
1062 | |
1063 // If breakpoints are more numerous than just JVMTI breakpoints, | |
1064 // consider compressing this data structure. | |
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1065 // It is currently a simple linked list defined in method.hpp. |
0 | 1066 |
1067 class BreakpointInfo; | |
1068 | |
1069 | |
1070 // A collection point for interesting information about the previous | |
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1071 // version(s) of an InstanceKlass. This class uses weak references to |
0 | 1072 // the information so that the information may be collected as needed |
47
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1073 // by the system. If the information is shared, then a regular |
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1074 // reference must be used because a weak reference would be seen as |
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1075 // collectible. A GrowableArray of PreviousVersionNodes is attached |
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1076 // to the InstanceKlass as needed. See PreviousVersionWalker below. |
6197 | 1077 class PreviousVersionNode : public CHeapObj<mtClass> { |
0 | 1078 private: |
47
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1079 // A shared ConstantPool is never collected so we'll always have |
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1080 // a reference to it so we can update items in the cache. We'll |
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1081 // have a weak reference to a non-shared ConstantPool until all |
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1082 // of the methods (EMCP or obsolete) have been collected; the |
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1083 // non-shared ConstantPool becomes collectible at that point. |
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1084 ConstantPool* _prev_constant_pool; // regular or weak reference |
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1085 bool _prev_cp_is_weak; // true if not a shared ConstantPool |
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1086 |
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1087 // If the previous version of the InstanceKlass doesn't have any |
0 | 1088 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the |
1089 // EMCP methods have been collected, then _prev_EMCP_methods can | |
1090 // have a length of zero. | |
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1091 GrowableArray<Method*>* _prev_EMCP_methods; |
0 | 1092 |
1093 public: | |
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1094 PreviousVersionNode(ConstantPool* prev_constant_pool, bool prev_cp_is_weak, |
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1095 GrowableArray<Method*>* prev_EMCP_methods); |
0 | 1096 ~PreviousVersionNode(); |
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1097 ConstantPool* prev_constant_pool() const { |
0 | 1098 return _prev_constant_pool; |
1099 } | |
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1100 GrowableArray<Method*>* prev_EMCP_methods() const { |
0 | 1101 return _prev_EMCP_methods; |
1102 } | |
1103 }; | |
1104 | |
1105 | |
1106 // A Handle-ized version of PreviousVersionNode. | |
1107 class PreviousVersionInfo : public ResourceObj { | |
1108 private: | |
1109 constantPoolHandle _prev_constant_pool_handle; | |
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1110 // If the previous version of the InstanceKlass doesn't have any |
0 | 1111 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the |
1112 // methods cannot be collected while we hold a handle, | |
1113 // _prev_EMCP_methods should never have a length of zero. | |
1114 GrowableArray<methodHandle>* _prev_EMCP_method_handles; | |
1115 | |
1116 public: | |
1117 PreviousVersionInfo(PreviousVersionNode *pv_node); | |
1118 ~PreviousVersionInfo(); | |
1119 constantPoolHandle prev_constant_pool_handle() const { | |
1120 return _prev_constant_pool_handle; | |
1121 } | |
1122 GrowableArray<methodHandle>* prev_EMCP_method_handles() const { | |
1123 return _prev_EMCP_method_handles; | |
1124 } | |
1125 }; | |
1126 | |
1127 | |
1128 // Helper object for walking previous versions. This helper cleans up | |
1129 // the Handles that it allocates when the helper object is destroyed. | |
1130 // The PreviousVersionInfo object returned by next_previous_version() | |
1131 // is only valid until a subsequent call to next_previous_version() or | |
1132 // the helper object is destroyed. | |
1133 class PreviousVersionWalker : public StackObj { | |
1134 private: | |
1135 GrowableArray<PreviousVersionNode *>* _previous_versions; | |
1136 int _current_index; | |
1137 // Fields for cleaning up when we are done walking the previous versions: | |
1138 // A HandleMark for the PreviousVersionInfo handles: | |
1139 HandleMark _hm; | |
1140 | |
1141 // It would be nice to have a ResourceMark field in this helper also, | |
1142 // but the ResourceMark code says to be careful to delete handles held | |
1143 // in GrowableArrays _before_ deleting the GrowableArray. Since we | |
1144 // can't guarantee the order in which the fields are destroyed, we | |
1145 // have to let the creator of the PreviousVersionWalker object do | |
1146 // the right thing. Also, adding a ResourceMark here causes an | |
1147 // include loop. | |
1148 | |
1149 // A pointer to the current info object so we can handle the deletes. | |
1150 PreviousVersionInfo * _current_p; | |
1151 | |
1152 public: | |
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1153 PreviousVersionWalker(InstanceKlass *ik); |
0 | 1154 ~PreviousVersionWalker(); |
1155 | |
1156 // Return the interesting information for the next previous version | |
1157 // of the klass. Returns NULL if there are no more previous versions. | |
1158 PreviousVersionInfo* next_previous_version(); | |
1159 }; | |
1972 | 1160 |
3939 | 1161 |
1162 // | |
1163 // nmethodBucket is used to record dependent nmethods for | |
1164 // deoptimization. nmethod dependencies are actually <klass, method> | |
1165 // pairs but we really only care about the klass part for purposes of | |
1166 // finding nmethods which might need to be deoptimized. Instead of | |
1167 // recording the method, a count of how many times a particular nmethod | |
1168 // was recorded is kept. This ensures that any recording errors are | |
1169 // noticed since an nmethod should be removed as many times are it's | |
1170 // added. | |
1171 // | |
6197 | 1172 class nmethodBucket: public CHeapObj<mtClass> { |
3939 | 1173 friend class VMStructs; |
1174 private: | |
1175 nmethod* _nmethod; | |
1176 int _count; | |
1177 nmethodBucket* _next; | |
1178 | |
1179 public: | |
1180 nmethodBucket(nmethod* nmethod, nmethodBucket* next) { | |
1181 _nmethod = nmethod; | |
1182 _next = next; | |
1183 _count = 1; | |
1184 } | |
1185 int count() { return _count; } | |
1186 int increment() { _count += 1; return _count; } | |
1187 int decrement() { _count -= 1; assert(_count >= 0, "don't underflow"); return _count; } | |
1188 nmethodBucket* next() { return _next; } | |
1189 void set_next(nmethodBucket* b) { _next = b; } | |
1190 nmethod* get_nmethod() { return _nmethod; } | |
1191 }; | |
1192 | |
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1193 // An iterator that's used to access the inner classes indices in the |
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1194 // InstanceKlass::_inner_classes array. |
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1195 class InnerClassesIterator : public StackObj { |
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1196 private: |
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1197 Array<jushort>* _inner_classes; |
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1198 int _length; |
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1199 int _idx; |
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1200 public: |
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1201 |
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1202 InnerClassesIterator(instanceKlassHandle k) { |
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1203 _inner_classes = k->inner_classes(); |
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1204 if (k->inner_classes() != NULL) { |
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1205 _length = _inner_classes->length(); |
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1206 // The inner class array's length should be the multiple of |
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1207 // inner_class_next_offset if it only contains the InnerClasses |
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1208 // attribute data, or it should be |
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1209 // n*inner_class_next_offset+enclosing_method_attribute_size |
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1210 // if it also contains the EnclosingMethod data. |
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1211 assert((_length % InstanceKlass::inner_class_next_offset == 0 || |
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1212 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), |
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1213 "just checking"); |
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1214 // Remove the enclosing_method portion if exists. |
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1215 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { |
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1216 _length -= InstanceKlass::enclosing_method_attribute_size; |
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1217 } |
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1218 } else { |
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1219 _length = 0; |
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1220 } |
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1221 _idx = 0; |
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1222 } |
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1223 |
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1224 int length() const { |
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1225 return _length; |
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1226 } |
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1227 |
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1228 void next() { |
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1229 _idx += InstanceKlass::inner_class_next_offset; |
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1230 } |
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1231 |
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1232 bool done() const { |
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1233 return (_idx >= _length); |
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1234 } |
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1235 |
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1236 u2 inner_class_info_index() const { |
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1237 return _inner_classes->at( |
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1238 _idx + InstanceKlass::inner_class_inner_class_info_offset); |
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1239 } |
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1240 |
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1241 void set_inner_class_info_index(u2 index) { |
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1242 _inner_classes->at_put( |
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1243 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); |
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1244 } |
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1245 |
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1246 u2 outer_class_info_index() const { |
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1247 return _inner_classes->at( |
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1248 _idx + InstanceKlass::inner_class_outer_class_info_offset); |
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1249 } |
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1250 |
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1251 void set_outer_class_info_index(u2 index) { |
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1252 _inner_classes->at_put( |
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1253 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); |
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1254 } |
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1255 |
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1256 u2 inner_name_index() const { |
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1257 return _inner_classes->at( |
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1258 _idx + InstanceKlass::inner_class_inner_name_offset); |
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1259 } |
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1260 |
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1261 void set_inner_name_index(u2 index) { |
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1262 _inner_classes->at_put( |
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1263 _idx + InstanceKlass::inner_class_inner_name_offset, index); |
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1264 } |
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1265 |
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1266 u2 inner_access_flags() const { |
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1267 return _inner_classes->at( |
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1268 _idx + InstanceKlass::inner_class_access_flags_offset); |
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1269 } |
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1270 }; |
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1271 |
1972 | 1272 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP |