Mercurial > hg > truffle
annotate src/share/vm/oops/klass.hpp @ 8003:3c9bc17b9403
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author | bpittore |
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date | Thu, 07 Feb 2013 16:05:48 -0500 |
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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 // [verify_count ] - not in product |
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83 // [alloc_count ] |
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84 // [_modified_oops] |
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85 // [_accumulated_modified_oops] |
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86 // [trace_id] |
0 | 87 |
88 | |
89 // Forward declarations. | |
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90 template <class T> class Array; |
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91 template <class T> class GrowableArray; |
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92 class ClassLoaderData; |
0 | 93 class klassVtable; |
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94 class ParCompactionManager; |
7956 | 95 class KlassSizeStats; |
0 | 96 |
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97 class Klass : public Metadata { |
0 | 98 friend class VMStructs; |
99 protected: | |
100 // note: put frequently-used fields together at start of klass structure | |
101 // for better cache behavior (may not make much of a difference but sure won't hurt) | |
102 enum { _primary_super_limit = 8 }; | |
103 | |
104 // The "layout helper" is a combined descriptor of object layout. | |
105 // For klasses which are neither instance nor array, the value is zero. | |
106 // | |
107 // For instances, layout helper is a positive number, the instance size. | |
108 // This size is already passed through align_object_size and scaled to bytes. | |
109 // The low order bit is set if instances of this class cannot be | |
110 // allocated using the fastpath. | |
111 // | |
112 // For arrays, layout helper is a negative number, containing four | |
113 // distinct bytes, as follows: | |
114 // MSB:[tag, hsz, ebt, log2(esz)]:LSB | |
115 // where: | |
116 // tag is 0x80 if the elements are oops, 0xC0 if non-oops | |
117 // hsz is array header size in bytes (i.e., offset of first element) | |
118 // ebt is the BasicType of the elements | |
119 // esz is the element size in bytes | |
120 // This packed word is arranged so as to be quickly unpacked by the | |
121 // various fast paths that use the various subfields. | |
122 // | |
123 // The esz bits can be used directly by a SLL instruction, without masking. | |
124 // | |
125 // Note that the array-kind tag looks like 0x00 for instance klasses, | |
126 // since their length in bytes is always less than 24Mb. | |
127 // | |
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128 // Final note: This comes first, immediately after C++ vtable, |
0 | 129 // because it is frequently queried. |
130 jint _layout_helper; | |
131 | |
132 // The fields _super_check_offset, _secondary_super_cache, _secondary_supers | |
133 // and _primary_supers all help make fast subtype checks. See big discussion | |
134 // in doc/server_compiler/checktype.txt | |
135 // | |
136 // Where to look to observe a supertype (it is &_secondary_super_cache for | |
137 // secondary supers, else is &_primary_supers[depth()]. | |
138 juint _super_check_offset; | |
139 | |
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140 // Class name. Instance classes: java/lang/String, etc. Array classes: [I, |
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141 // [Ljava/lang/String;, etc. Set to zero for all other kinds of classes. |
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142 Symbol* _name; |
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143 |
0 | 144 // Cache of last observed secondary supertype |
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145 Klass* _secondary_super_cache; |
0 | 146 // Array of all secondary supertypes |
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147 Array<Klass*>* _secondary_supers; |
0 | 148 // Ordered list of all primary supertypes |
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149 Klass* _primary_supers[_primary_super_limit]; |
0 | 150 // java/lang/Class instance mirroring this class |
151 oop _java_mirror; | |
152 // Superclass | |
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153 Klass* _super; |
0 | 154 // First subclass (NULL if none); _subklass->next_sibling() is next one |
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155 Klass* _subklass; |
0 | 156 // Sibling link (or NULL); links all subklasses of a klass |
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157 Klass* _next_sibling; |
0 | 158 |
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159 // All klasses loaded by a class loader are chained through these links |
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160 Klass* _next_link; |
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161 |
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162 // The VM's representation of the ClassLoader used to load this class. |
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163 // Provide access the corresponding instance java.lang.ClassLoader. |
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164 ClassLoaderData* _class_loader_data; |
0 | 165 |
166 jint _modifier_flags; // Processed access flags, for use by Class.getModifiers. | |
167 AccessFlags _access_flags; // Access flags. The class/interface distinction is stored here. | |
168 | |
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169 // Biased locking implementation and statistics |
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170 // (the 64-bit chunk goes first, to avoid some fragmentation) |
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171 jlong _last_biased_lock_bulk_revocation_time; |
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172 markOop _prototype_header; // Used when biased locking is both enabled and disabled for this type |
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173 jint _biased_lock_revocation_count; |
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174 |
0 | 175 #ifndef PRODUCT |
176 int _verify_count; // to avoid redundant verifies | |
177 #endif | |
178 | |
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179 juint _alloc_count; // allocation profiling support |
0 | 180 |
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181 TRACE_DEFINE_KLASS_TRACE_ID; |
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182 |
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183 // Remembered sets support for the oops in the klasses. |
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184 jbyte _modified_oops; // Card Table Equivalent (YC/CMS support) |
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185 jbyte _accumulated_modified_oops; // Mod Union Equivalent (CMS support) |
0 | 186 |
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187 // Constructor |
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188 Klass(); |
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189 |
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190 void* operator new(size_t size, ClassLoaderData* loader_data, size_t word_size, TRAPS); |
0 | 191 |
192 public: | |
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193 bool is_klass() const volatile { return true; } |
0 | 194 |
195 // super | |
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196 Klass* super() const { return _super; } |
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197 void set_super(Klass* k) { _super = k; } |
0 | 198 |
199 // initializes _super link, _primary_supers & _secondary_supers arrays | |
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200 void initialize_supers(Klass* k, TRAPS); |
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201 void initialize_supers_impl1(Klass* k); |
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202 void initialize_supers_impl2(Klass* k); |
0 | 203 |
204 // klass-specific helper for initializing _secondary_supers | |
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205 virtual GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots); |
0 | 206 |
207 // java_super is the Java-level super type as specified by Class.getSuperClass. | |
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208 virtual Klass* java_super() const { return NULL; } |
0 | 209 |
210 juint super_check_offset() const { return _super_check_offset; } | |
211 void set_super_check_offset(juint o) { _super_check_offset = o; } | |
212 | |
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213 Klass* secondary_super_cache() const { return _secondary_super_cache; } |
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214 void set_secondary_super_cache(Klass* k) { _secondary_super_cache = k; } |
0 | 215 |
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216 Array<Klass*>* secondary_supers() const { return _secondary_supers; } |
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217 void set_secondary_supers(Array<Klass*>* k) { _secondary_supers = k; } |
0 | 218 |
219 // Return the element of the _super chain of the given depth. | |
220 // If there is no such element, return either NULL or this. | |
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221 Klass* primary_super_of_depth(juint i) const { |
0 | 222 assert(i < primary_super_limit(), "oob"); |
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223 Klass* super = _primary_supers[i]; |
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224 assert(super == NULL || super->super_depth() == i, "correct display"); |
0 | 225 return super; |
226 } | |
227 | |
228 // Can this klass be a primary super? False for interfaces and arrays of | |
229 // interfaces. False also for arrays or classes with long super chains. | |
230 bool can_be_primary_super() const { | |
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231 const juint secondary_offset = in_bytes(secondary_super_cache_offset()); |
0 | 232 return super_check_offset() != secondary_offset; |
233 } | |
234 virtual bool can_be_primary_super_slow() const; | |
235 | |
236 // Returns number of primary supers; may be a number in the inclusive range [0, primary_super_limit]. | |
237 juint super_depth() const { | |
238 if (!can_be_primary_super()) { | |
239 return primary_super_limit(); | |
240 } else { | |
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241 juint d = (super_check_offset() - in_bytes(primary_supers_offset())) / sizeof(Klass*); |
0 | 242 assert(d < primary_super_limit(), "oob"); |
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243 assert(_primary_supers[d] == this, "proper init"); |
0 | 244 return d; |
245 } | |
246 } | |
247 | |
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248 // store an oop into a field of a Klass |
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249 void klass_oop_store(oop* p, oop v); |
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250 void klass_oop_store(volatile oop* p, oop v); |
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251 |
0 | 252 // java mirror |
253 oop java_mirror() const { return _java_mirror; } | |
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254 void set_java_mirror(oop m) { klass_oop_store(&_java_mirror, m); } |
0 | 255 |
256 // modifier flags | |
257 jint modifier_flags() const { return _modifier_flags; } | |
258 void set_modifier_flags(jint flags) { _modifier_flags = flags; } | |
259 | |
260 // size helper | |
261 int layout_helper() const { return _layout_helper; } | |
262 void set_layout_helper(int lh) { _layout_helper = lh; } | |
263 | |
264 // Note: for instances layout_helper() may include padding. | |
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265 // Use InstanceKlass::contains_field_offset to classify field offsets. |
0 | 266 |
267 // sub/superklass links | |
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268 InstanceKlass* superklass() const; |
0 | 269 Klass* subklass() const; |
270 Klass* next_sibling() const; | |
271 void append_to_sibling_list(); // add newly created receiver to superklass' subklass list | |
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272 |
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273 void set_next_link(Klass* k) { _next_link = k; } |
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274 Klass* next_link() const { return _next_link; } // The next klass defined by the class loader. |
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275 |
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276 // class loader data |
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277 ClassLoaderData* class_loader_data() const { return _class_loader_data; } |
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278 void set_class_loader_data(ClassLoaderData* loader_data) { _class_loader_data = loader_data; } |
0 | 279 |
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280 // The Klasses are not placed in the Heap, so the Card Table or |
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281 // the Mod Union Table can't be used to mark when klasses have modified oops. |
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282 // The CT and MUT bits saves this information for the individual Klasses. |
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283 void record_modified_oops() { _modified_oops = 1; } |
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284 void clear_modified_oops() { _modified_oops = 0; } |
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285 bool has_modified_oops() { return _modified_oops == 1; } |
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286 |
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287 void accumulate_modified_oops() { if (has_modified_oops()) _accumulated_modified_oops = 1; } |
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288 void clear_accumulated_modified_oops() { _accumulated_modified_oops = 0; } |
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289 bool has_accumulated_modified_oops() { return _accumulated_modified_oops == 1; } |
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290 |
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291 protected: // internal accessors |
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292 Klass* subklass_oop() const { return _subklass; } |
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293 Klass* next_sibling_oop() const { return _next_sibling; } |
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294 void set_subklass(Klass* s); |
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295 void set_next_sibling(Klass* s); |
0 | 296 |
297 public: | |
298 // Allocation profiling support | |
299 juint alloc_count() const { return _alloc_count; } | |
300 void set_alloc_count(juint n) { _alloc_count = n; } | |
301 virtual juint alloc_size() const = 0; | |
302 virtual void set_alloc_size(juint n) = 0; | |
303 | |
304 // Compiler support | |
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305 static ByteSize super_offset() { return in_ByteSize(offset_of(Klass, _super)); } |
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306 static ByteSize super_check_offset_offset() { return in_ByteSize(offset_of(Klass, _super_check_offset)); } |
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307 static ByteSize primary_supers_offset() { return in_ByteSize(offset_of(Klass, _primary_supers)); } |
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308 static ByteSize secondary_super_cache_offset() { return in_ByteSize(offset_of(Klass, _secondary_super_cache)); } |
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309 static ByteSize secondary_supers_offset() { return in_ByteSize(offset_of(Klass, _secondary_supers)); } |
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310 static ByteSize java_mirror_offset() { return in_ByteSize(offset_of(Klass, _java_mirror)); } |
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311 static ByteSize modifier_flags_offset() { return in_ByteSize(offset_of(Klass, _modifier_flags)); } |
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312 static ByteSize layout_helper_offset() { return in_ByteSize(offset_of(Klass, _layout_helper)); } |
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313 static ByteSize access_flags_offset() { return in_ByteSize(offset_of(Klass, _access_flags)); } |
0 | 314 |
315 // Unpacking layout_helper: | |
316 enum { | |
317 _lh_neutral_value = 0, // neutral non-array non-instance value | |
318 _lh_instance_slow_path_bit = 0x01, | |
319 _lh_log2_element_size_shift = BitsPerByte*0, | |
320 _lh_log2_element_size_mask = BitsPerLong-1, | |
321 _lh_element_type_shift = BitsPerByte*1, | |
322 _lh_element_type_mask = right_n_bits(BitsPerByte), // shifted mask | |
323 _lh_header_size_shift = BitsPerByte*2, | |
324 _lh_header_size_mask = right_n_bits(BitsPerByte), // shifted mask | |
325 _lh_array_tag_bits = 2, | |
326 _lh_array_tag_shift = BitsPerInt - _lh_array_tag_bits, | |
327 _lh_array_tag_type_value = ~0x00, // 0xC0000000 >> 30 | |
328 _lh_array_tag_obj_value = ~0x01 // 0x80000000 >> 30 | |
329 }; | |
330 | |
331 static int layout_helper_size_in_bytes(jint lh) { | |
332 assert(lh > (jint)_lh_neutral_value, "must be instance"); | |
333 return (int) lh & ~_lh_instance_slow_path_bit; | |
334 } | |
335 static bool layout_helper_needs_slow_path(jint lh) { | |
336 assert(lh > (jint)_lh_neutral_value, "must be instance"); | |
337 return (lh & _lh_instance_slow_path_bit) != 0; | |
338 } | |
339 static bool layout_helper_is_instance(jint lh) { | |
340 return (jint)lh > (jint)_lh_neutral_value; | |
341 } | |
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342 static bool layout_helper_is_array(jint lh) { |
0 | 343 return (jint)lh < (jint)_lh_neutral_value; |
344 } | |
345 static bool layout_helper_is_typeArray(jint lh) { | |
346 // _lh_array_tag_type_value == (lh >> _lh_array_tag_shift); | |
347 return (juint)lh >= (juint)(_lh_array_tag_type_value << _lh_array_tag_shift); | |
348 } | |
349 static bool layout_helper_is_objArray(jint lh) { | |
350 // _lh_array_tag_obj_value == (lh >> _lh_array_tag_shift); | |
351 return (jint)lh < (jint)(_lh_array_tag_type_value << _lh_array_tag_shift); | |
352 } | |
353 static int layout_helper_header_size(jint lh) { | |
354 assert(lh < (jint)_lh_neutral_value, "must be array"); | |
355 int hsize = (lh >> _lh_header_size_shift) & _lh_header_size_mask; | |
356 assert(hsize > 0 && hsize < (int)sizeof(oopDesc)*3, "sanity"); | |
357 return hsize; | |
358 } | |
359 static BasicType layout_helper_element_type(jint lh) { | |
360 assert(lh < (jint)_lh_neutral_value, "must be array"); | |
361 int btvalue = (lh >> _lh_element_type_shift) & _lh_element_type_mask; | |
362 assert(btvalue >= T_BOOLEAN && btvalue <= T_OBJECT, "sanity"); | |
363 return (BasicType) btvalue; | |
364 } | |
365 static int layout_helper_log2_element_size(jint lh) { | |
366 assert(lh < (jint)_lh_neutral_value, "must be array"); | |
367 int l2esz = (lh >> _lh_log2_element_size_shift) & _lh_log2_element_size_mask; | |
368 assert(l2esz <= LogBitsPerLong, "sanity"); | |
369 return l2esz; | |
370 } | |
371 static jint array_layout_helper(jint tag, int hsize, BasicType etype, int log2_esize) { | |
372 return (tag << _lh_array_tag_shift) | |
373 | (hsize << _lh_header_size_shift) | |
374 | ((int)etype << _lh_element_type_shift) | |
375 | (log2_esize << _lh_log2_element_size_shift); | |
376 } | |
377 static jint instance_layout_helper(jint size, bool slow_path_flag) { | |
378 return (size << LogHeapWordSize) | |
379 | (slow_path_flag ? _lh_instance_slow_path_bit : 0); | |
380 } | |
381 static int layout_helper_to_size_helper(jint lh) { | |
382 assert(lh > (jint)_lh_neutral_value, "must be instance"); | |
383 // Note that the following expression discards _lh_instance_slow_path_bit. | |
384 return lh >> LogHeapWordSize; | |
385 } | |
386 // Out-of-line version computes everything based on the etype: | |
387 static jint array_layout_helper(BasicType etype); | |
388 | |
389 // What is the maximum number of primary superclasses any klass can have? | |
390 #ifdef PRODUCT | |
391 static juint primary_super_limit() { return _primary_super_limit; } | |
392 #else | |
393 static juint primary_super_limit() { | |
394 assert(FastSuperclassLimit <= _primary_super_limit, "parameter oob"); | |
395 return FastSuperclassLimit; | |
396 } | |
397 #endif | |
398 | |
399 // vtables | |
400 virtual klassVtable* vtable() const { return NULL; } | |
401 | |
402 // subclass check | |
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403 bool is_subclass_of(Klass* k) const; |
0 | 404 // subtype check: true if is_subclass_of, or if k is interface and receiver implements it |
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405 bool is_subtype_of(Klass* k) const { |
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406 juint off = k->super_check_offset(); |
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407 Klass* sup = *(Klass**)( (address)this + off ); |
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408 const juint secondary_offset = in_bytes(secondary_super_cache_offset()); |
0 | 409 if (sup == k) { |
410 return true; | |
411 } else if (off != secondary_offset) { | |
412 return false; | |
413 } else { | |
414 return search_secondary_supers(k); | |
415 } | |
416 } | |
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417 bool search_secondary_supers(Klass* k) const; |
0 | 418 |
605 | 419 // Find LCA in class hierarchy |
0 | 420 Klass *LCA( Klass *k ); |
421 | |
422 // Check whether reflection/jni/jvm code is allowed to instantiate this class; | |
423 // if not, throw either an Error or an Exception. | |
424 virtual void check_valid_for_instantiation(bool throwError, TRAPS); | |
425 | |
426 // array copying | |
427 virtual void copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS); | |
428 | |
429 // tells if the class should be initialized | |
430 virtual bool should_be_initialized() const { return false; } | |
431 // initializes the klass | |
432 virtual void initialize(TRAPS); | |
433 // lookup operation for MethodLookupCache | |
434 friend class MethodLookupCache; | |
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435 virtual Method* uncached_lookup_method(Symbol* name, Symbol* signature) const; |
0 | 436 public: |
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437 Method* lookup_method(Symbol* name, Symbol* signature) const { |
0 | 438 return uncached_lookup_method(name, signature); |
439 } | |
440 | |
441 // array class with specific rank | |
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442 Klass* array_klass(int rank, TRAPS) { return array_klass_impl(false, rank, THREAD); } |
0 | 443 |
444 // array class with this klass as element type | |
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445 Klass* array_klass(TRAPS) { return array_klass_impl(false, THREAD); } |
0 | 446 |
447 // These will return NULL instead of allocating on the heap: | |
448 // NB: these can block for a mutex, like other functions with TRAPS arg. | |
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449 Klass* array_klass_or_null(int rank); |
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450 Klass* array_klass_or_null(); |
0 | 451 |
452 virtual oop protection_domain() { return NULL; } | |
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453 |
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454 oop class_loader() const; |
0 | 455 |
7409 | 456 virtual oop klass_holder() const { return class_loader(); } |
457 | |
0 | 458 protected: |
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459 virtual Klass* array_klass_impl(bool or_null, int rank, TRAPS); |
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460 virtual Klass* array_klass_impl(bool or_null, TRAPS); |
0 | 461 |
462 public: | |
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463 // CDS support - remove and restore oops from metadata. Oops are not shared. |
0 | 464 virtual void remove_unshareable_info(); |
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465 virtual void restore_unshareable_info(TRAPS); |
0 | 466 |
467 protected: | |
468 // computes the subtype relationship | |
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469 virtual bool compute_is_subtype_of(Klass* k); |
0 | 470 public: |
471 // subclass accessor (here for convenience; undefined for non-klass objects) | |
472 virtual bool is_leaf_class() const { fatal("not a class"); return false; } | |
473 public: | |
474 // ALL FUNCTIONS BELOW THIS POINT ARE DISPATCHED FROM AN OOP | |
475 // These functions describe behavior for the oop not the KLASS. | |
476 | |
477 // actual oop size of obj in memory | |
478 virtual int oop_size(oop obj) const = 0; | |
479 | |
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480 // Size of klass in word size. |
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481 virtual int size() const = 0; |
7956 | 482 #if INCLUDE_SERVICES |
483 virtual void collect_statistics(KlassSizeStats *sz) const; | |
484 #endif | |
0 | 485 |
486 // Returns the Java name for a class (Resource allocated) | |
487 // For arrays, this returns the name of the element with a leading '['. | |
488 // For classes, this returns the name with the package separators | |
489 // turned into '.'s. | |
490 const char* external_name() const; | |
491 // Returns the name for a class (Resource allocated) as the class | |
492 // would appear in a signature. | |
493 // For arrays, this returns the name of the element with a leading '['. | |
494 // For classes, this returns the name with a leading 'L' and a trailing ';' | |
495 // and the package separators as '/'. | |
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496 virtual const char* signature_name() const; |
0 | 497 |
498 // garbage collection support | |
499 virtual void oop_follow_contents(oop obj) = 0; | |
500 virtual int oop_adjust_pointers(oop obj) = 0; | |
501 | |
502 // Parallel Scavenge and Parallel Old | |
503 PARALLEL_GC_DECLS_PV | |
504 | |
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505 // type testing operations |
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506 protected: |
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507 virtual bool oop_is_instance_slow() const { return false; } |
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508 virtual bool oop_is_array_slow() const { return false; } |
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509 virtual bool oop_is_objArray_slow() const { return false; } |
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510 virtual bool oop_is_typeArray_slow() const { return false; } |
0 | 511 public: |
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512 virtual bool oop_is_instanceMirror() const { return false; } |
0 | 513 virtual bool oop_is_instanceRef() const { return false; } |
514 | |
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515 // Fast non-virtual versions |
0 | 516 #ifndef ASSERT |
517 #define assert_same_query(xval, xcheck) xval | |
518 #else | |
519 private: | |
520 static bool assert_same_query(bool xval, bool xslow) { | |
521 assert(xval == xslow, "slow and fast queries agree"); | |
522 return xval; | |
523 } | |
524 public: | |
525 #endif | |
526 inline bool oop_is_instance() const { return assert_same_query( | |
527 layout_helper_is_instance(layout_helper()), | |
528 oop_is_instance_slow()); } | |
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529 inline bool oop_is_array() const { return assert_same_query( |
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530 layout_helper_is_array(layout_helper()), |
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531 oop_is_array_slow()); } |
0 | 532 inline bool oop_is_objArray() const { return assert_same_query( |
533 layout_helper_is_objArray(layout_helper()), | |
534 oop_is_objArray_slow()); } | |
535 inline bool oop_is_typeArray() const { return assert_same_query( | |
536 layout_helper_is_typeArray(layout_helper()), | |
537 oop_is_typeArray_slow()); } | |
538 #undef assert_same_query | |
539 | |
540 // Access flags | |
541 AccessFlags access_flags() const { return _access_flags; } | |
542 void set_access_flags(AccessFlags flags) { _access_flags = flags; } | |
543 | |
544 bool is_public() const { return _access_flags.is_public(); } | |
545 bool is_final() const { return _access_flags.is_final(); } | |
546 bool is_interface() const { return _access_flags.is_interface(); } | |
547 bool is_abstract() const { return _access_flags.is_abstract(); } | |
548 bool is_super() const { return _access_flags.is_super(); } | |
549 bool is_synthetic() const { return _access_flags.is_synthetic(); } | |
550 void set_is_synthetic() { _access_flags.set_is_synthetic(); } | |
551 bool has_finalizer() const { return _access_flags.has_finalizer(); } | |
552 bool has_final_method() const { return _access_flags.has_final_method(); } | |
553 void set_has_finalizer() { _access_flags.set_has_finalizer(); } | |
554 void set_has_final_method() { _access_flags.set_has_final_method(); } | |
555 bool is_cloneable() const { return _access_flags.is_cloneable(); } | |
556 void set_is_cloneable() { _access_flags.set_is_cloneable(); } | |
557 bool has_vanilla_constructor() const { return _access_flags.has_vanilla_constructor(); } | |
558 void set_has_vanilla_constructor() { _access_flags.set_has_vanilla_constructor(); } | |
559 bool has_miranda_methods () const { return access_flags().has_miranda_methods(); } | |
560 void set_has_miranda_methods() { _access_flags.set_has_miranda_methods(); } | |
561 | |
562 // Biased locking support | |
563 // Note: the prototype header is always set up to be at least the | |
564 // prototype markOop. If biased locking is enabled it may further be | |
565 // biasable and have an epoch. | |
566 markOop prototype_header() const { return _prototype_header; } | |
567 // NOTE: once instances of this klass are floating around in the | |
568 // system, this header must only be updated at a safepoint. | |
569 // NOTE 2: currently we only ever set the prototype header to the | |
570 // biasable prototype for instanceKlasses. There is no technical | |
571 // reason why it could not be done for arrayKlasses aside from | |
572 // wanting to reduce the initial scope of this optimization. There | |
573 // are potential problems in setting the bias pattern for | |
574 // JVM-internal oops. | |
575 inline void set_prototype_header(markOop header); | |
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576 static ByteSize prototype_header_offset() { return in_ByteSize(offset_of(Klass, _prototype_header)); } |
0 | 577 |
578 int biased_lock_revocation_count() const { return (int) _biased_lock_revocation_count; } | |
579 // Atomically increments biased_lock_revocation_count and returns updated value | |
580 int atomic_incr_biased_lock_revocation_count(); | |
581 void set_biased_lock_revocation_count(int val) { _biased_lock_revocation_count = (jint) val; } | |
582 jlong last_biased_lock_bulk_revocation_time() { return _last_biased_lock_bulk_revocation_time; } | |
583 void set_last_biased_lock_bulk_revocation_time(jlong cur_time) { _last_biased_lock_bulk_revocation_time = cur_time; } | |
584 | |
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585 TRACE_DEFINE_KLASS_METHODS; |
0 | 586 |
587 // garbage collection support | |
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588 virtual void oops_do(OopClosure* cl); |
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589 |
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590 // Iff the class loader (or mirror for anonymous classes) is alive the |
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591 // Klass is considered alive. |
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592 // The is_alive closure passed in depends on the Garbage Collector used. |
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593 bool is_loader_alive(BoolObjectClosure* is_alive); |
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594 |
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595 static void clean_weak_klass_links(BoolObjectClosure* is_alive); |
0 | 596 |
597 // Prefetch within oop iterators. This is a macro because we | |
598 // can't guarantee that the compiler will inline it. In 64-bit | |
599 // it generally doesn't. Signature is | |
600 // | |
601 // static void prefetch_beyond(oop* const start, | |
602 // oop* const end, | |
603 // const intx foffset, | |
604 // const Prefetch::style pstyle); | |
605 #define prefetch_beyond(start, end, foffset, pstyle) { \ | |
606 const intx foffset_ = (foffset); \ | |
607 const Prefetch::style pstyle_ = (pstyle); \ | |
608 assert(foffset_ > 0, "prefetch beyond, not behind"); \ | |
609 if (pstyle_ != Prefetch::do_none) { \ | |
610 oop* ref = (start); \ | |
611 if (ref < (end)) { \ | |
612 switch (pstyle_) { \ | |
613 case Prefetch::do_read: \ | |
614 Prefetch::read(*ref, foffset_); \ | |
615 break; \ | |
616 case Prefetch::do_write: \ | |
617 Prefetch::write(*ref, foffset_); \ | |
618 break; \ | |
619 default: \ | |
620 ShouldNotReachHere(); \ | |
621 break; \ | |
622 } \ | |
623 } \ | |
624 } \ | |
625 } | |
626 | |
627 // iterators | |
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628 virtual int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) = 0; |
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629 virtual int oop_oop_iterate_v(oop obj, ExtendedOopClosure* blk) { |
0 | 630 return oop_oop_iterate(obj, blk); |
631 } | |
632 | |
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633 #if INCLUDE_ALL_GCS |
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634 // In case we don't have a specialized backward scanner use forward |
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635 // iteration. |
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636 virtual int oop_oop_iterate_backwards_v(oop obj, ExtendedOopClosure* blk) { |
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637 return oop_oop_iterate_v(obj, blk); |
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638 } |
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639 #endif // INCLUDE_ALL_GCS |
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640 |
0 | 641 // Iterates "blk" over all the oops in "obj" (of type "this") within "mr". |
642 // (I don't see why the _m should be required, but without it the Solaris | |
643 // C++ gives warning messages about overridings of the "oop_oop_iterate" | |
644 // defined above "hiding" this virtual function. (DLD, 6/20/00)) */ | |
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645 virtual int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) = 0; |
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646 virtual int oop_oop_iterate_v_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) { |
0 | 647 return oop_oop_iterate_m(obj, blk, mr); |
648 } | |
649 | |
650 // Versions of the above iterators specialized to particular subtypes | |
651 // of OopClosure, to avoid closure virtual calls. | |
652 #define Klass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ | |
653 virtual int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk) { \ | |
654 /* Default implementation reverts to general version. */ \ | |
655 return oop_oop_iterate(obj, blk); \ | |
656 } \ | |
657 \ | |
658 /* Iterates "blk" over all the oops in "obj" (of type "this") within "mr". \ | |
659 (I don't see why the _m should be required, but without it the Solaris \ | |
660 C++ gives warning messages about overridings of the "oop_oop_iterate" \ | |
661 defined above "hiding" this virtual function. (DLD, 6/20/00)) */ \ | |
662 virtual int oop_oop_iterate##nv_suffix##_m(oop obj, \ | |
663 OopClosureType* blk, \ | |
664 MemRegion mr) { \ | |
665 return oop_oop_iterate_m(obj, blk, mr); \ | |
666 } | |
667 | |
668 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_1(Klass_OOP_OOP_ITERATE_DECL) | |
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669 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_2(Klass_OOP_OOP_ITERATE_DECL) |
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670 |
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671 #if INCLUDE_ALL_GCS |
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672 #define Klass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ |
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673 virtual int oop_oop_iterate_backwards##nv_suffix(oop obj, \ |
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674 OopClosureType* blk) { \ |
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675 /* Default implementation reverts to general version. */ \ |
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676 return oop_oop_iterate_backwards_v(obj, blk); \ |
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677 } |
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678 |
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679 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_1(Klass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
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680 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_2(Klass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
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681 #endif // INCLUDE_ALL_GCS |
0 | 682 |
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683 virtual void array_klasses_do(void f(Klass* k)) {} |
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684 virtual void with_array_klasses_do(void f(Klass* k)); |
0 | 685 |
686 // Return self, except for abstract classes with exactly 1 | |
687 // implementor. Then return the 1 concrete implementation. | |
688 Klass *up_cast_abstract(); | |
689 | |
690 // klass name | |
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691 Symbol* name() const { return _name; } |
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692 void set_name(Symbol* n); |
0 | 693 |
694 public: | |
695 // jvm support | |
696 virtual jint compute_modifier_flags(TRAPS) const; | |
697 | |
698 // JVMTI support | |
699 virtual jint jvmti_class_status() const; | |
700 | |
701 // Printing | |
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702 virtual void print_on(outputStream* st) const; |
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703 |
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704 virtual void oop_print_value_on(oop obj, outputStream* st); |
0 | 705 virtual void oop_print_on (oop obj, outputStream* st); |
706 | |
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707 virtual const char* internal_name() const = 0; |
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708 |
0 | 709 // Verification |
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710 virtual void verify_on(outputStream* st); |
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711 void verify() { verify_on(tty); } |
0 | 712 |
713 #ifndef PRODUCT | |
714 void verify_vtable_index(int index); | |
715 #endif | |
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716 |
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717 virtual void oop_verify_on(oop obj, outputStream* st); |
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718 |
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719 private: |
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720 // barriers used by klass_oop_store |
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721 void klass_update_barrier_set(oop v); |
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722 void klass_update_barrier_set_pre(void* p, oop v); |
0 | 723 }; |
1972 | 724 |
725 #endif // SHARE_VM_OOPS_KLASS_HPP |