Mercurial > hg > truffle
annotate src/share/vm/oops/klass.hpp @ 11034:e0c9a1d29eb4
8016325: JVM hangs verifying system dictionary
Summary: Minimize redundant verifications of Klasses.
Reviewed-by: hseigel, jmasa
| author | coleenp |
|---|---|
| date | Mon, 24 Jun 2013 18:55:46 -0400 |
| parents | 6bd680e9ea35 |
| children | 71180a6e5080 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 7956 | 2 * Copyright (c) 1997, 2013, 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_KLASS_HPP |
| 26 #define SHARE_VM_OOPS_KLASS_HPP | |
| 27 | |
| 28 #include "memory/genOopClosures.hpp" | |
| 29 #include "memory/iterator.hpp" | |
| 30 #include "memory/memRegion.hpp" | |
| 31 #include "memory/specialized_oop_closures.hpp" | |
| 32 #include "oops/klassPS.hpp" | |
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33 #include "oops/metadata.hpp" |
| 1972 | 34 #include "oops/oop.hpp" |
| 35 #include "runtime/orderAccess.hpp" | |
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36 #include "trace/traceMacros.hpp" |
| 1972 | 37 #include "utilities/accessFlags.hpp" |
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38 #include "utilities/macros.hpp" |
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39 #if INCLUDE_ALL_GCS |
| 1972 | 40 #include "gc_implementation/concurrentMarkSweep/cmsOopClosures.hpp" |
| 41 #include "gc_implementation/g1/g1OopClosures.hpp" | |
| 42 #include "gc_implementation/parNew/parOopClosures.hpp" | |
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43 #endif // INCLUDE_ALL_GCS |
| 1972 | 44 |
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45 // |
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46 // A Klass provides: |
| 0 | 47 // 1: language level class object (method dictionary etc.) |
| 48 // 2: provide vm dispatch behavior for the object | |
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49 // Both functions are combined into one C++ class. |
| 0 | 50 |
| 51 // One reason for the oop/klass dichotomy in the implementation is | |
| 52 // that we don't want a C++ vtbl pointer in every object. Thus, | |
| 53 // normal oops don't have any virtual functions. Instead, they | |
| 54 // forward all "virtual" functions to their klass, which does have | |
| 55 // a vtbl and does the C++ dispatch depending on the object's | |
| 56 // actual type. (See oop.inline.hpp for some of the forwarding code.) | |
| 57 // ALL FUNCTIONS IMPLEMENTING THIS DISPATCH ARE PREFIXED WITH "oop_"! | |
| 58 | |
| 59 // Klass layout: | |
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60 // [C++ vtbl ptr ] (contained in Metadata) |
| 0 | 61 // [layout_helper ] |
| 62 // [super_check_offset ] for fast subtype checks | |
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63 // [name ] |
| 0 | 64 // [secondary_super_cache] for fast subtype checks |
| 65 // [secondary_supers ] array of 2ndary supertypes | |
| 66 // [primary_supers 0] | |
| 67 // [primary_supers 1] | |
| 68 // [primary_supers 2] | |
| 69 // ... | |
| 70 // [primary_supers 7] | |
| 71 // [java_mirror ] | |
| 72 // [super ] | |
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73 // [subklass ] first subclass |
| 0 | 74 // [next_sibling ] link to chain additional subklasses |
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75 // [next_link ] |
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76 // [class_loader_data] |
| 0 | 77 // [modifier_flags] |
| 78 // [access_flags ] | |
| 79 // [last_biased_lock_bulk_revocation_time] (64 bits) | |
| 80 // [prototype_header] | |
| 81 // [biased_lock_revocation_count] | |
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82 // [alloc_count ] |
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83 // [_modified_oops] |
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84 // [_accumulated_modified_oops] |
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85 // [trace_id] |
| 0 | 86 |
| 87 | |
| 88 // Forward declarations. | |
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89 template <class T> class Array; |
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90 template <class T> class GrowableArray; |
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91 class ClassLoaderData; |
| 0 | 92 class klassVtable; |
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93 class ParCompactionManager; |
| 7956 | 94 class KlassSizeStats; |
| 0 | 95 |
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96 class Klass : public Metadata { |
| 0 | 97 friend class VMStructs; |
| 98 protected: | |
| 99 // note: put frequently-used fields together at start of klass structure | |
| 100 // for better cache behavior (may not make much of a difference but sure won't hurt) | |
| 101 enum { _primary_super_limit = 8 }; | |
| 102 | |
| 103 // The "layout helper" is a combined descriptor of object layout. | |
| 104 // For klasses which are neither instance nor array, the value is zero. | |
| 105 // | |
| 106 // For instances, layout helper is a positive number, the instance size. | |
| 107 // This size is already passed through align_object_size and scaled to bytes. | |
| 108 // The low order bit is set if instances of this class cannot be | |
| 109 // allocated using the fastpath. | |
| 110 // | |
| 111 // For arrays, layout helper is a negative number, containing four | |
| 112 // distinct bytes, as follows: | |
| 113 // MSB:[tag, hsz, ebt, log2(esz)]:LSB | |
| 114 // where: | |
| 115 // tag is 0x80 if the elements are oops, 0xC0 if non-oops | |
| 116 // hsz is array header size in bytes (i.e., offset of first element) | |
| 117 // ebt is the BasicType of the elements | |
| 118 // esz is the element size in bytes | |
| 119 // This packed word is arranged so as to be quickly unpacked by the | |
| 120 // various fast paths that use the various subfields. | |
| 121 // | |
| 122 // The esz bits can be used directly by a SLL instruction, without masking. | |
| 123 // | |
| 124 // Note that the array-kind tag looks like 0x00 for instance klasses, | |
| 125 // since their length in bytes is always less than 24Mb. | |
| 126 // | |
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127 // Final note: This comes first, immediately after C++ vtable, |
| 0 | 128 // because it is frequently queried. |
| 129 jint _layout_helper; | |
| 130 | |
| 131 // The fields _super_check_offset, _secondary_super_cache, _secondary_supers | |
| 132 // and _primary_supers all help make fast subtype checks. See big discussion | |
| 133 // in doc/server_compiler/checktype.txt | |
| 134 // | |
| 135 // Where to look to observe a supertype (it is &_secondary_super_cache for | |
| 136 // secondary supers, else is &_primary_supers[depth()]. | |
| 137 juint _super_check_offset; | |
| 138 | |
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139 // Class name. Instance classes: java/lang/String, etc. Array classes: [I, |
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140 // [Ljava/lang/String;, etc. Set to zero for all other kinds of classes. |
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141 Symbol* _name; |
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142 |
| 0 | 143 // Cache of last observed secondary supertype |
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144 Klass* _secondary_super_cache; |
| 0 | 145 // Array of all secondary supertypes |
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146 Array<Klass*>* _secondary_supers; |
| 0 | 147 // Ordered list of all primary supertypes |
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148 Klass* _primary_supers[_primary_super_limit]; |
| 0 | 149 // java/lang/Class instance mirroring this class |
| 150 oop _java_mirror; | |
| 151 // Superclass | |
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152 Klass* _super; |
| 0 | 153 // First subclass (NULL if none); _subklass->next_sibling() is next one |
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154 Klass* _subklass; |
| 0 | 155 // Sibling link (or NULL); links all subklasses of a klass |
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156 Klass* _next_sibling; |
| 0 | 157 |
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158 // All klasses loaded by a class loader are chained through these links |
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159 Klass* _next_link; |
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160 |
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161 // The VM's representation of the ClassLoader used to load this class. |
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162 // Provide access the corresponding instance java.lang.ClassLoader. |
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163 ClassLoaderData* _class_loader_data; |
| 0 | 164 |
| 165 jint _modifier_flags; // Processed access flags, for use by Class.getModifiers. | |
| 166 AccessFlags _access_flags; // Access flags. The class/interface distinction is stored here. | |
| 167 | |
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168 // Biased locking implementation and statistics |
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169 // (the 64-bit chunk goes first, to avoid some fragmentation) |
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170 jlong _last_biased_lock_bulk_revocation_time; |
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171 markOop _prototype_header; // Used when biased locking is both enabled and disabled for this type |
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172 jint _biased_lock_revocation_count; |
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173 |
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174 juint _alloc_count; // allocation profiling support |
| 0 | 175 |
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176 TRACE_DEFINE_KLASS_TRACE_ID; |
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177 |
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178 // Remembered sets support for the oops in the klasses. |
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179 jbyte _modified_oops; // Card Table Equivalent (YC/CMS support) |
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180 jbyte _accumulated_modified_oops; // Mod Union Equivalent (CMS support) |
| 0 | 181 |
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182 // Constructor |
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183 Klass(); |
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184 |
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185 void* operator new(size_t size, ClassLoaderData* loader_data, size_t word_size, TRAPS); |
| 0 | 186 |
| 187 public: | |
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188 bool is_klass() const volatile { return true; } |
| 0 | 189 |
| 190 // super | |
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191 Klass* super() const { return _super; } |
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192 void set_super(Klass* k) { _super = k; } |
| 0 | 193 |
| 194 // initializes _super link, _primary_supers & _secondary_supers arrays | |
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195 void initialize_supers(Klass* k, TRAPS); |
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196 void initialize_supers_impl1(Klass* k); |
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197 void initialize_supers_impl2(Klass* k); |
| 0 | 198 |
| 199 // klass-specific helper for initializing _secondary_supers | |
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200 virtual GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots); |
| 0 | 201 |
| 202 // java_super is the Java-level super type as specified by Class.getSuperClass. | |
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203 virtual Klass* java_super() const { return NULL; } |
| 0 | 204 |
| 205 juint super_check_offset() const { return _super_check_offset; } | |
| 206 void set_super_check_offset(juint o) { _super_check_offset = o; } | |
| 207 | |
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208 Klass* secondary_super_cache() const { return _secondary_super_cache; } |
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209 void set_secondary_super_cache(Klass* k) { _secondary_super_cache = k; } |
| 0 | 210 |
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211 Array<Klass*>* secondary_supers() const { return _secondary_supers; } |
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212 void set_secondary_supers(Array<Klass*>* k) { _secondary_supers = k; } |
| 0 | 213 |
| 214 // Return the element of the _super chain of the given depth. | |
| 215 // If there is no such element, return either NULL or this. | |
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216 Klass* primary_super_of_depth(juint i) const { |
| 0 | 217 assert(i < primary_super_limit(), "oob"); |
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218 Klass* super = _primary_supers[i]; |
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219 assert(super == NULL || super->super_depth() == i, "correct display"); |
| 0 | 220 return super; |
| 221 } | |
| 222 | |
| 223 // Can this klass be a primary super? False for interfaces and arrays of | |
| 224 // interfaces. False also for arrays or classes with long super chains. | |
| 225 bool can_be_primary_super() const { | |
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226 const juint secondary_offset = in_bytes(secondary_super_cache_offset()); |
| 0 | 227 return super_check_offset() != secondary_offset; |
| 228 } | |
| 229 virtual bool can_be_primary_super_slow() const; | |
| 230 | |
| 231 // Returns number of primary supers; may be a number in the inclusive range [0, primary_super_limit]. | |
| 232 juint super_depth() const { | |
| 233 if (!can_be_primary_super()) { | |
| 234 return primary_super_limit(); | |
| 235 } else { | |
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236 juint d = (super_check_offset() - in_bytes(primary_supers_offset())) / sizeof(Klass*); |
| 0 | 237 assert(d < primary_super_limit(), "oob"); |
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238 assert(_primary_supers[d] == this, "proper init"); |
| 0 | 239 return d; |
| 240 } | |
| 241 } | |
| 242 | |
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243 // store an oop into a field of a Klass |
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244 void klass_oop_store(oop* p, oop v); |
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245 void klass_oop_store(volatile oop* p, oop v); |
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246 |
| 0 | 247 // java mirror |
| 248 oop java_mirror() const { return _java_mirror; } | |
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249 void set_java_mirror(oop m) { klass_oop_store(&_java_mirror, m); } |
| 0 | 250 |
| 251 // modifier flags | |
| 252 jint modifier_flags() const { return _modifier_flags; } | |
| 253 void set_modifier_flags(jint flags) { _modifier_flags = flags; } | |
| 254 | |
| 255 // size helper | |
| 256 int layout_helper() const { return _layout_helper; } | |
| 257 void set_layout_helper(int lh) { _layout_helper = lh; } | |
| 258 | |
| 259 // Note: for instances layout_helper() may include padding. | |
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260 // Use InstanceKlass::contains_field_offset to classify field offsets. |
| 0 | 261 |
| 262 // sub/superklass links | |
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263 InstanceKlass* superklass() const; |
| 0 | 264 Klass* subklass() const; |
| 265 Klass* next_sibling() const; | |
| 266 void append_to_sibling_list(); // add newly created receiver to superklass' subklass list | |
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267 |
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268 void set_next_link(Klass* k) { _next_link = k; } |
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269 Klass* next_link() const { return _next_link; } // The next klass defined by the class loader. |
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270 |
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271 // class loader data |
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272 ClassLoaderData* class_loader_data() const { return _class_loader_data; } |
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273 void set_class_loader_data(ClassLoaderData* loader_data) { _class_loader_data = loader_data; } |
| 0 | 274 |
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275 // The Klasses are not placed in the Heap, so the Card Table or |
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276 // the Mod Union Table can't be used to mark when klasses have modified oops. |
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277 // The CT and MUT bits saves this information for the individual Klasses. |
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278 void record_modified_oops() { _modified_oops = 1; } |
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279 void clear_modified_oops() { _modified_oops = 0; } |
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280 bool has_modified_oops() { return _modified_oops == 1; } |
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281 |
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282 void accumulate_modified_oops() { if (has_modified_oops()) _accumulated_modified_oops = 1; } |
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283 void clear_accumulated_modified_oops() { _accumulated_modified_oops = 0; } |
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284 bool has_accumulated_modified_oops() { return _accumulated_modified_oops == 1; } |
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285 |
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286 protected: // internal accessors |
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287 Klass* subklass_oop() const { return _subklass; } |
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288 Klass* next_sibling_oop() const { return _next_sibling; } |
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289 void set_subklass(Klass* s); |
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290 void set_next_sibling(Klass* s); |
| 0 | 291 |
| 292 public: | |
| 293 // Allocation profiling support | |
| 294 juint alloc_count() const { return _alloc_count; } | |
| 295 void set_alloc_count(juint n) { _alloc_count = n; } | |
| 296 virtual juint alloc_size() const = 0; | |
| 297 virtual void set_alloc_size(juint n) = 0; | |
| 298 | |
| 299 // Compiler support | |
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300 static ByteSize super_offset() { return in_ByteSize(offset_of(Klass, _super)); } |
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301 static ByteSize super_check_offset_offset() { return in_ByteSize(offset_of(Klass, _super_check_offset)); } |
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302 static ByteSize primary_supers_offset() { return in_ByteSize(offset_of(Klass, _primary_supers)); } |
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303 static ByteSize secondary_super_cache_offset() { return in_ByteSize(offset_of(Klass, _secondary_super_cache)); } |
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304 static ByteSize secondary_supers_offset() { return in_ByteSize(offset_of(Klass, _secondary_supers)); } |
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305 static ByteSize java_mirror_offset() { return in_ByteSize(offset_of(Klass, _java_mirror)); } |
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306 static ByteSize modifier_flags_offset() { return in_ByteSize(offset_of(Klass, _modifier_flags)); } |
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307 static ByteSize layout_helper_offset() { return in_ByteSize(offset_of(Klass, _layout_helper)); } |
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308 static ByteSize access_flags_offset() { return in_ByteSize(offset_of(Klass, _access_flags)); } |
| 0 | 309 |
| 310 // Unpacking layout_helper: | |
| 311 enum { | |
| 312 _lh_neutral_value = 0, // neutral non-array non-instance value | |
| 313 _lh_instance_slow_path_bit = 0x01, | |
| 314 _lh_log2_element_size_shift = BitsPerByte*0, | |
| 315 _lh_log2_element_size_mask = BitsPerLong-1, | |
| 316 _lh_element_type_shift = BitsPerByte*1, | |
| 317 _lh_element_type_mask = right_n_bits(BitsPerByte), // shifted mask | |
| 318 _lh_header_size_shift = BitsPerByte*2, | |
| 319 _lh_header_size_mask = right_n_bits(BitsPerByte), // shifted mask | |
| 320 _lh_array_tag_bits = 2, | |
| 321 _lh_array_tag_shift = BitsPerInt - _lh_array_tag_bits, | |
| 322 _lh_array_tag_type_value = ~0x00, // 0xC0000000 >> 30 | |
| 323 _lh_array_tag_obj_value = ~0x01 // 0x80000000 >> 30 | |
| 324 }; | |
| 325 | |
| 326 static int layout_helper_size_in_bytes(jint lh) { | |
| 327 assert(lh > (jint)_lh_neutral_value, "must be instance"); | |
| 328 return (int) lh & ~_lh_instance_slow_path_bit; | |
| 329 } | |
| 330 static bool layout_helper_needs_slow_path(jint lh) { | |
| 331 assert(lh > (jint)_lh_neutral_value, "must be instance"); | |
| 332 return (lh & _lh_instance_slow_path_bit) != 0; | |
| 333 } | |
| 334 static bool layout_helper_is_instance(jint lh) { | |
| 335 return (jint)lh > (jint)_lh_neutral_value; | |
| 336 } | |
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337 static bool layout_helper_is_array(jint lh) { |
| 0 | 338 return (jint)lh < (jint)_lh_neutral_value; |
| 339 } | |
| 340 static bool layout_helper_is_typeArray(jint lh) { | |
| 341 // _lh_array_tag_type_value == (lh >> _lh_array_tag_shift); | |
| 342 return (juint)lh >= (juint)(_lh_array_tag_type_value << _lh_array_tag_shift); | |
| 343 } | |
| 344 static bool layout_helper_is_objArray(jint lh) { | |
| 345 // _lh_array_tag_obj_value == (lh >> _lh_array_tag_shift); | |
| 346 return (jint)lh < (jint)(_lh_array_tag_type_value << _lh_array_tag_shift); | |
| 347 } | |
| 348 static int layout_helper_header_size(jint lh) { | |
| 349 assert(lh < (jint)_lh_neutral_value, "must be array"); | |
| 350 int hsize = (lh >> _lh_header_size_shift) & _lh_header_size_mask; | |
| 351 assert(hsize > 0 && hsize < (int)sizeof(oopDesc)*3, "sanity"); | |
| 352 return hsize; | |
| 353 } | |
| 354 static BasicType layout_helper_element_type(jint lh) { | |
| 355 assert(lh < (jint)_lh_neutral_value, "must be array"); | |
| 356 int btvalue = (lh >> _lh_element_type_shift) & _lh_element_type_mask; | |
| 357 assert(btvalue >= T_BOOLEAN && btvalue <= T_OBJECT, "sanity"); | |
| 358 return (BasicType) btvalue; | |
| 359 } | |
| 360 static int layout_helper_log2_element_size(jint lh) { | |
| 361 assert(lh < (jint)_lh_neutral_value, "must be array"); | |
| 362 int l2esz = (lh >> _lh_log2_element_size_shift) & _lh_log2_element_size_mask; | |
| 363 assert(l2esz <= LogBitsPerLong, "sanity"); | |
| 364 return l2esz; | |
| 365 } | |
| 366 static jint array_layout_helper(jint tag, int hsize, BasicType etype, int log2_esize) { | |
| 367 return (tag << _lh_array_tag_shift) | |
| 368 | (hsize << _lh_header_size_shift) | |
| 369 | ((int)etype << _lh_element_type_shift) | |
| 370 | (log2_esize << _lh_log2_element_size_shift); | |
| 371 } | |
| 372 static jint instance_layout_helper(jint size, bool slow_path_flag) { | |
| 373 return (size << LogHeapWordSize) | |
| 374 | (slow_path_flag ? _lh_instance_slow_path_bit : 0); | |
| 375 } | |
| 376 static int layout_helper_to_size_helper(jint lh) { | |
| 377 assert(lh > (jint)_lh_neutral_value, "must be instance"); | |
| 378 // Note that the following expression discards _lh_instance_slow_path_bit. | |
| 379 return lh >> LogHeapWordSize; | |
| 380 } | |
| 381 // Out-of-line version computes everything based on the etype: | |
| 382 static jint array_layout_helper(BasicType etype); | |
| 383 | |
| 384 // What is the maximum number of primary superclasses any klass can have? | |
| 385 #ifdef PRODUCT | |
| 386 static juint primary_super_limit() { return _primary_super_limit; } | |
| 387 #else | |
| 388 static juint primary_super_limit() { | |
| 389 assert(FastSuperclassLimit <= _primary_super_limit, "parameter oob"); | |
| 390 return FastSuperclassLimit; | |
| 391 } | |
| 392 #endif | |
| 393 | |
| 394 // vtables | |
| 395 virtual klassVtable* vtable() const { return NULL; } | |
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396 virtual int vtable_length() const { return 0; } |
| 0 | 397 |
| 398 // subclass check | |
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399 bool is_subclass_of(const Klass* k) const; |
| 0 | 400 // subtype check: true if is_subclass_of, or if k is interface and receiver implements it |
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401 bool is_subtype_of(Klass* k) const { |
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402 juint off = k->super_check_offset(); |
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403 Klass* sup = *(Klass**)( (address)this + off ); |
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404 const juint secondary_offset = in_bytes(secondary_super_cache_offset()); |
| 0 | 405 if (sup == k) { |
| 406 return true; | |
| 407 } else if (off != secondary_offset) { | |
| 408 return false; | |
| 409 } else { | |
| 410 return search_secondary_supers(k); | |
| 411 } | |
| 412 } | |
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413 bool search_secondary_supers(Klass* k) const; |
| 0 | 414 |
| 605 | 415 // Find LCA in class hierarchy |
| 0 | 416 Klass *LCA( Klass *k ); |
| 417 | |
| 418 // Check whether reflection/jni/jvm code is allowed to instantiate this class; | |
| 419 // if not, throw either an Error or an Exception. | |
| 420 virtual void check_valid_for_instantiation(bool throwError, TRAPS); | |
| 421 | |
| 422 // array copying | |
| 423 virtual void copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS); | |
| 424 | |
| 425 // tells if the class should be initialized | |
| 426 virtual bool should_be_initialized() const { return false; } | |
| 427 // initializes the klass | |
| 428 virtual void initialize(TRAPS); | |
| 429 // lookup operation for MethodLookupCache | |
| 430 friend class MethodLookupCache; | |
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431 virtual Method* uncached_lookup_method(Symbol* name, Symbol* signature) const; |
| 0 | 432 public: |
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433 Method* lookup_method(Symbol* name, Symbol* signature) const { |
| 0 | 434 return uncached_lookup_method(name, signature); |
| 435 } | |
| 436 | |
| 437 // array class with specific rank | |
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438 Klass* array_klass(int rank, TRAPS) { return array_klass_impl(false, rank, THREAD); } |
| 0 | 439 |
| 440 // array class with this klass as element type | |
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441 Klass* array_klass(TRAPS) { return array_klass_impl(false, THREAD); } |
| 0 | 442 |
| 443 // These will return NULL instead of allocating on the heap: | |
| 444 // NB: these can block for a mutex, like other functions with TRAPS arg. | |
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445 Klass* array_klass_or_null(int rank); |
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446 Klass* array_klass_or_null(); |
| 0 | 447 |
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448 virtual oop protection_domain() const = 0; |
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449 |
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450 oop class_loader() const; |
| 0 | 451 |
| 7409 | 452 virtual oop klass_holder() const { return class_loader(); } |
| 453 | |
| 0 | 454 protected: |
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455 virtual Klass* array_klass_impl(bool or_null, int rank, TRAPS); |
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456 virtual Klass* array_klass_impl(bool or_null, TRAPS); |
| 0 | 457 |
| 458 public: | |
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459 // CDS support - remove and restore oops from metadata. Oops are not shared. |
| 0 | 460 virtual void remove_unshareable_info(); |
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461 virtual void restore_unshareable_info(TRAPS); |
| 0 | 462 |
| 463 protected: | |
| 464 // computes the subtype relationship | |
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465 virtual bool compute_is_subtype_of(Klass* k); |
| 0 | 466 public: |
| 467 // subclass accessor (here for convenience; undefined for non-klass objects) | |
| 468 virtual bool is_leaf_class() const { fatal("not a class"); return false; } | |
| 469 public: | |
| 470 // ALL FUNCTIONS BELOW THIS POINT ARE DISPATCHED FROM AN OOP | |
| 471 // These functions describe behavior for the oop not the KLASS. | |
| 472 | |
| 473 // actual oop size of obj in memory | |
| 474 virtual int oop_size(oop obj) const = 0; | |
| 475 | |
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476 // Size of klass in word size. |
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477 virtual int size() const = 0; |
| 7956 | 478 #if INCLUDE_SERVICES |
| 479 virtual void collect_statistics(KlassSizeStats *sz) const; | |
| 480 #endif | |
| 0 | 481 |
| 482 // Returns the Java name for a class (Resource allocated) | |
| 483 // For arrays, this returns the name of the element with a leading '['. | |
| 484 // For classes, this returns the name with the package separators | |
| 485 // turned into '.'s. | |
| 486 const char* external_name() const; | |
| 487 // Returns the name for a class (Resource allocated) as the class | |
| 488 // would appear in a signature. | |
| 489 // For arrays, this returns the name of the element with a leading '['. | |
| 490 // For classes, this returns the name with a leading 'L' and a trailing ';' | |
| 491 // and the package separators as '/'. | |
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492 virtual const char* signature_name() const; |
| 0 | 493 |
| 494 // garbage collection support | |
| 495 virtual void oop_follow_contents(oop obj) = 0; | |
| 496 virtual int oop_adjust_pointers(oop obj) = 0; | |
| 497 | |
| 498 // Parallel Scavenge and Parallel Old | |
| 499 PARALLEL_GC_DECLS_PV | |
| 500 | |
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501 // type testing operations |
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502 protected: |
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503 virtual bool oop_is_instance_slow() const { return false; } |
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504 virtual bool oop_is_array_slow() const { return false; } |
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505 virtual bool oop_is_objArray_slow() const { return false; } |
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506 virtual bool oop_is_typeArray_slow() const { return false; } |
| 0 | 507 public: |
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508 virtual bool oop_is_instanceMirror() const { return false; } |
| 0 | 509 virtual bool oop_is_instanceRef() const { return false; } |
| 510 | |
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511 // Fast non-virtual versions |
| 0 | 512 #ifndef ASSERT |
| 513 #define assert_same_query(xval, xcheck) xval | |
| 514 #else | |
| 515 private: | |
| 516 static bool assert_same_query(bool xval, bool xslow) { | |
| 517 assert(xval == xslow, "slow and fast queries agree"); | |
| 518 return xval; | |
| 519 } | |
| 520 public: | |
| 521 #endif | |
| 522 inline bool oop_is_instance() const { return assert_same_query( | |
| 523 layout_helper_is_instance(layout_helper()), | |
| 524 oop_is_instance_slow()); } | |
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525 inline bool oop_is_array() const { return assert_same_query( |
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526 layout_helper_is_array(layout_helper()), |
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527 oop_is_array_slow()); } |
| 0 | 528 inline bool oop_is_objArray() const { return assert_same_query( |
| 529 layout_helper_is_objArray(layout_helper()), | |
| 530 oop_is_objArray_slow()); } | |
| 531 inline bool oop_is_typeArray() const { return assert_same_query( | |
| 532 layout_helper_is_typeArray(layout_helper()), | |
| 533 oop_is_typeArray_slow()); } | |
| 534 #undef assert_same_query | |
| 535 | |
| 536 // Access flags | |
| 537 AccessFlags access_flags() const { return _access_flags; } | |
| 538 void set_access_flags(AccessFlags flags) { _access_flags = flags; } | |
| 539 | |
| 540 bool is_public() const { return _access_flags.is_public(); } | |
| 541 bool is_final() const { return _access_flags.is_final(); } | |
| 542 bool is_interface() const { return _access_flags.is_interface(); } | |
| 543 bool is_abstract() const { return _access_flags.is_abstract(); } | |
| 544 bool is_super() const { return _access_flags.is_super(); } | |
| 545 bool is_synthetic() const { return _access_flags.is_synthetic(); } | |
| 546 void set_is_synthetic() { _access_flags.set_is_synthetic(); } | |
| 547 bool has_finalizer() const { return _access_flags.has_finalizer(); } | |
| 548 bool has_final_method() const { return _access_flags.has_final_method(); } | |
| 549 void set_has_finalizer() { _access_flags.set_has_finalizer(); } | |
| 550 void set_has_final_method() { _access_flags.set_has_final_method(); } | |
| 551 bool is_cloneable() const { return _access_flags.is_cloneable(); } | |
| 552 void set_is_cloneable() { _access_flags.set_is_cloneable(); } | |
| 553 bool has_vanilla_constructor() const { return _access_flags.has_vanilla_constructor(); } | |
| 554 void set_has_vanilla_constructor() { _access_flags.set_has_vanilla_constructor(); } | |
| 555 bool has_miranda_methods () const { return access_flags().has_miranda_methods(); } | |
| 556 void set_has_miranda_methods() { _access_flags.set_has_miranda_methods(); } | |
| 557 | |
| 558 // Biased locking support | |
| 559 // Note: the prototype header is always set up to be at least the | |
| 560 // prototype markOop. If biased locking is enabled it may further be | |
| 561 // biasable and have an epoch. | |
| 562 markOop prototype_header() const { return _prototype_header; } | |
| 563 // NOTE: once instances of this klass are floating around in the | |
| 564 // system, this header must only be updated at a safepoint. | |
| 565 // NOTE 2: currently we only ever set the prototype header to the | |
| 566 // biasable prototype for instanceKlasses. There is no technical | |
| 567 // reason why it could not be done for arrayKlasses aside from | |
| 568 // wanting to reduce the initial scope of this optimization. There | |
| 569 // are potential problems in setting the bias pattern for | |
| 570 // JVM-internal oops. | |
| 571 inline void set_prototype_header(markOop header); | |
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572 static ByteSize prototype_header_offset() { return in_ByteSize(offset_of(Klass, _prototype_header)); } |
| 0 | 573 |
| 574 int biased_lock_revocation_count() const { return (int) _biased_lock_revocation_count; } | |
| 575 // Atomically increments biased_lock_revocation_count and returns updated value | |
| 576 int atomic_incr_biased_lock_revocation_count(); | |
| 577 void set_biased_lock_revocation_count(int val) { _biased_lock_revocation_count = (jint) val; } | |
| 578 jlong last_biased_lock_bulk_revocation_time() { return _last_biased_lock_bulk_revocation_time; } | |
| 579 void set_last_biased_lock_bulk_revocation_time(jlong cur_time) { _last_biased_lock_bulk_revocation_time = cur_time; } | |
| 580 | |
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581 TRACE_DEFINE_KLASS_METHODS; |
| 0 | 582 |
| 583 // garbage collection support | |
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584 virtual void oops_do(OopClosure* cl); |
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585 |
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586 // Iff the class loader (or mirror for anonymous classes) is alive the |
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587 // Klass is considered alive. |
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588 // The is_alive closure passed in depends on the Garbage Collector used. |
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589 bool is_loader_alive(BoolObjectClosure* is_alive); |
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590 |
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591 static void clean_weak_klass_links(BoolObjectClosure* is_alive); |
| 0 | 592 |
| 593 // Prefetch within oop iterators. This is a macro because we | |
| 594 // can't guarantee that the compiler will inline it. In 64-bit | |
| 595 // it generally doesn't. Signature is | |
| 596 // | |
| 597 // static void prefetch_beyond(oop* const start, | |
| 598 // oop* const end, | |
| 599 // const intx foffset, | |
| 600 // const Prefetch::style pstyle); | |
| 601 #define prefetch_beyond(start, end, foffset, pstyle) { \ | |
| 602 const intx foffset_ = (foffset); \ | |
| 603 const Prefetch::style pstyle_ = (pstyle); \ | |
| 604 assert(foffset_ > 0, "prefetch beyond, not behind"); \ | |
| 605 if (pstyle_ != Prefetch::do_none) { \ | |
| 606 oop* ref = (start); \ | |
| 607 if (ref < (end)) { \ | |
| 608 switch (pstyle_) { \ | |
| 609 case Prefetch::do_read: \ | |
| 610 Prefetch::read(*ref, foffset_); \ | |
| 611 break; \ | |
| 612 case Prefetch::do_write: \ | |
| 613 Prefetch::write(*ref, foffset_); \ | |
| 614 break; \ | |
| 615 default: \ | |
| 616 ShouldNotReachHere(); \ | |
| 617 break; \ | |
| 618 } \ | |
| 619 } \ | |
| 620 } \ | |
| 621 } | |
| 622 | |
| 623 // iterators | |
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624 virtual int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) = 0; |
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625 virtual int oop_oop_iterate_v(oop obj, ExtendedOopClosure* blk) { |
| 0 | 626 return oop_oop_iterate(obj, blk); |
| 627 } | |
| 628 | |
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629 #if INCLUDE_ALL_GCS |
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630 // In case we don't have a specialized backward scanner use forward |
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631 // iteration. |
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632 virtual int oop_oop_iterate_backwards_v(oop obj, ExtendedOopClosure* blk) { |
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633 return oop_oop_iterate_v(obj, blk); |
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634 } |
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635 #endif // INCLUDE_ALL_GCS |
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636 |
| 0 | 637 // Iterates "blk" over all the oops in "obj" (of type "this") within "mr". |
| 638 // (I don't see why the _m should be required, but without it the Solaris | |
| 639 // C++ gives warning messages about overridings of the "oop_oop_iterate" | |
| 640 // defined above "hiding" this virtual function. (DLD, 6/20/00)) */ | |
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641 virtual int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) = 0; |
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642 virtual int oop_oop_iterate_v_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) { |
| 0 | 643 return oop_oop_iterate_m(obj, blk, mr); |
| 644 } | |
| 645 | |
| 646 // Versions of the above iterators specialized to particular subtypes | |
| 647 // of OopClosure, to avoid closure virtual calls. | |
| 648 #define Klass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ | |
| 649 virtual int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk) { \ | |
| 650 /* Default implementation reverts to general version. */ \ | |
| 651 return oop_oop_iterate(obj, blk); \ | |
| 652 } \ | |
| 653 \ | |
| 654 /* Iterates "blk" over all the oops in "obj" (of type "this") within "mr". \ | |
| 655 (I don't see why the _m should be required, but without it the Solaris \ | |
| 656 C++ gives warning messages about overridings of the "oop_oop_iterate" \ | |
| 657 defined above "hiding" this virtual function. (DLD, 6/20/00)) */ \ | |
| 658 virtual int oop_oop_iterate##nv_suffix##_m(oop obj, \ | |
| 659 OopClosureType* blk, \ | |
| 660 MemRegion mr) { \ | |
| 661 return oop_oop_iterate_m(obj, blk, mr); \ | |
| 662 } | |
| 663 | |
| 664 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_1(Klass_OOP_OOP_ITERATE_DECL) | |
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665 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_2(Klass_OOP_OOP_ITERATE_DECL) |
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666 |
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667 #if INCLUDE_ALL_GCS |
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668 #define Klass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ |
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669 virtual int oop_oop_iterate_backwards##nv_suffix(oop obj, \ |
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670 OopClosureType* blk) { \ |
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671 /* Default implementation reverts to general version. */ \ |
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672 return oop_oop_iterate_backwards_v(obj, blk); \ |
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673 } |
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674 |
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675 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_1(Klass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
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676 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_2(Klass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
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677 #endif // INCLUDE_ALL_GCS |
| 0 | 678 |
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679 virtual void array_klasses_do(void f(Klass* k)) {} |
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680 virtual void with_array_klasses_do(void f(Klass* k)); |
| 0 | 681 |
| 682 // Return self, except for abstract classes with exactly 1 | |
| 683 // implementor. Then return the 1 concrete implementation. | |
| 684 Klass *up_cast_abstract(); | |
| 685 | |
| 686 // klass name | |
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687 Symbol* name() const { return _name; } |
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688 void set_name(Symbol* n); |
| 0 | 689 |
| 690 public: | |
| 691 // jvm support | |
| 692 virtual jint compute_modifier_flags(TRAPS) const; | |
| 693 | |
| 694 // JVMTI support | |
| 695 virtual jint jvmti_class_status() const; | |
| 696 | |
| 697 // Printing | |
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698 virtual void print_on(outputStream* st) const; |
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699 |
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700 virtual void oop_print_value_on(oop obj, outputStream* st); |
| 0 | 701 virtual void oop_print_on (oop obj, outputStream* st); |
| 702 | |
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703 virtual const char* internal_name() const = 0; |
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704 |
| 0 | 705 // Verification |
| 11034 | 706 virtual void verify_on(outputStream* st, bool check_dictionary); |
| 707 void verify(bool check_dictionary = true) { verify_on(tty, check_dictionary); } | |
| 0 | 708 |
| 709 #ifndef PRODUCT | |
| 710 void verify_vtable_index(int index); | |
| 711 #endif | |
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712 |
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713 virtual void oop_verify_on(oop obj, outputStream* st); |
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714 |
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715 private: |
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716 // barriers used by klass_oop_store |
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717 void klass_update_barrier_set(oop v); |
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718 void klass_update_barrier_set_pre(void* p, oop v); |
| 0 | 719 }; |
| 1972 | 720 |
| 721 #endif // SHARE_VM_OOPS_KLASS_HPP |