Mercurial > hg > truffle
annotate src/share/vm/oops/klass.hpp @ 8600:c423a5fd8ac7
Cull frame states before lowering.
author | Roland Schatz <roland.schatz@oracle.com> |
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date | Tue, 02 Apr 2013 11:47:56 +0200 |
parents | 5fc51c1ecdeb |
children | b9a918201d47 |
rev | line source |
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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; | |
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152 #ifdef GRAAL |
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153 // com/oracle/graal/hotspot/HotSpotResolvedObjectType mirroring this class |
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154 oop _graal_mirror; |
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155 #endif |
0 | 156 // Superclass |
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157 Klass* _super; |
0 | 158 // First subclass (NULL if none); _subklass->next_sibling() is next one |
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159 Klass* _subklass; |
0 | 160 // Sibling link (or NULL); links all subklasses of a klass |
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161 Klass* _next_sibling; |
0 | 162 |
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163 // All klasses loaded by a class loader are chained through these links |
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164 Klass* _next_link; |
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165 |
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166 // The VM's representation of the ClassLoader used to load this class. |
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167 // Provide access the corresponding instance java.lang.ClassLoader. |
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168 ClassLoaderData* _class_loader_data; |
0 | 169 |
170 jint _modifier_flags; // Processed access flags, for use by Class.getModifiers. | |
171 AccessFlags _access_flags; // Access flags. The class/interface distinction is stored here. | |
172 | |
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173 // Biased locking implementation and statistics |
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174 // (the 64-bit chunk goes first, to avoid some fragmentation) |
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175 jlong _last_biased_lock_bulk_revocation_time; |
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176 markOop _prototype_header; // Used when biased locking is both enabled and disabled for this type |
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177 jint _biased_lock_revocation_count; |
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178 |
0 | 179 #ifndef PRODUCT |
180 int _verify_count; // to avoid redundant verifies | |
181 #endif | |
182 | |
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183 juint _alloc_count; // allocation profiling support |
0 | 184 |
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185 TRACE_DEFINE_KLASS_TRACE_ID; |
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186 |
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187 // Remembered sets support for the oops in the klasses. |
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188 jbyte _modified_oops; // Card Table Equivalent (YC/CMS support) |
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189 jbyte _accumulated_modified_oops; // Mod Union Equivalent (CMS support) |
0 | 190 |
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191 // Constructor |
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192 Klass(); |
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193 |
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194 void* operator new(size_t size, ClassLoaderData* loader_data, size_t word_size, TRAPS); |
0 | 195 |
196 public: | |
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197 bool is_klass() const volatile { return true; } |
0 | 198 |
199 // super | |
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200 Klass* super() const { return _super; } |
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201 void set_super(Klass* k) { _super = k; } |
0 | 202 |
203 // initializes _super link, _primary_supers & _secondary_supers arrays | |
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204 void initialize_supers(Klass* k, TRAPS); |
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205 void initialize_supers_impl1(Klass* k); |
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206 void initialize_supers_impl2(Klass* k); |
0 | 207 |
208 // klass-specific helper for initializing _secondary_supers | |
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209 virtual GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots); |
0 | 210 |
211 // java_super is the Java-level super type as specified by Class.getSuperClass. | |
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212 virtual Klass* java_super() const { return NULL; } |
0 | 213 |
214 juint super_check_offset() const { return _super_check_offset; } | |
215 void set_super_check_offset(juint o) { _super_check_offset = o; } | |
216 | |
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217 Klass* secondary_super_cache() const { return _secondary_super_cache; } |
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218 void set_secondary_super_cache(Klass* k) { _secondary_super_cache = k; } |
0 | 219 |
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220 Array<Klass*>* secondary_supers() const { return _secondary_supers; } |
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221 void set_secondary_supers(Array<Klass*>* k) { _secondary_supers = k; } |
0 | 222 |
223 // Return the element of the _super chain of the given depth. | |
224 // If there is no such element, return either NULL or this. | |
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225 Klass* primary_super_of_depth(juint i) const { |
0 | 226 assert(i < primary_super_limit(), "oob"); |
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227 Klass* super = _primary_supers[i]; |
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228 assert(super == NULL || super->super_depth() == i, "correct display"); |
0 | 229 return super; |
230 } | |
231 | |
232 // Can this klass be a primary super? False for interfaces and arrays of | |
233 // interfaces. False also for arrays or classes with long super chains. | |
234 bool can_be_primary_super() const { | |
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235 const juint secondary_offset = in_bytes(secondary_super_cache_offset()); |
0 | 236 return super_check_offset() != secondary_offset; |
237 } | |
238 virtual bool can_be_primary_super_slow() const; | |
239 | |
240 // Returns number of primary supers; may be a number in the inclusive range [0, primary_super_limit]. | |
241 juint super_depth() const { | |
242 if (!can_be_primary_super()) { | |
243 return primary_super_limit(); | |
244 } else { | |
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245 juint d = (super_check_offset() - in_bytes(primary_supers_offset())) / sizeof(Klass*); |
0 | 246 assert(d < primary_super_limit(), "oob"); |
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247 assert(_primary_supers[d] == this, "proper init"); |
0 | 248 return d; |
249 } | |
250 } | |
251 | |
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252 // store an oop into a field of a Klass |
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253 void klass_oop_store(oop* p, oop v); |
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254 void klass_oop_store(volatile oop* p, oop v); |
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255 |
0 | 256 // java mirror |
257 oop java_mirror() const { return _java_mirror; } | |
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258 void set_java_mirror(oop m) { klass_oop_store(&_java_mirror, m); } |
0 | 259 |
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260 #ifdef GRAAL |
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261 // Graal mirror |
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262 oop graal_mirror() const { return _graal_mirror; } |
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263 void set_graal_mirror(oop m) { oop_store((oop*) &_graal_mirror, m); } |
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264 #endif |
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265 |
0 | 266 // modifier flags |
267 jint modifier_flags() const { return _modifier_flags; } | |
268 void set_modifier_flags(jint flags) { _modifier_flags = flags; } | |
269 | |
270 // size helper | |
271 int layout_helper() const { return _layout_helper; } | |
272 void set_layout_helper(int lh) { _layout_helper = lh; } | |
273 | |
274 // Note: for instances layout_helper() may include padding. | |
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275 // Use InstanceKlass::contains_field_offset to classify field offsets. |
0 | 276 |
277 // sub/superklass links | |
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278 InstanceKlass* superklass() const; |
0 | 279 Klass* subklass() const; |
280 Klass* next_sibling() const; | |
281 void append_to_sibling_list(); // add newly created receiver to superklass' subklass list | |
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282 |
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283 void set_next_link(Klass* k) { _next_link = k; } |
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284 Klass* next_link() const { return _next_link; } // The next klass defined by the class loader. |
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285 |
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286 // class loader data |
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287 ClassLoaderData* class_loader_data() const { return _class_loader_data; } |
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288 void set_class_loader_data(ClassLoaderData* loader_data) { _class_loader_data = loader_data; } |
0 | 289 |
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290 // The Klasses are not placed in the Heap, so the Card Table or |
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291 // the Mod Union Table can't be used to mark when klasses have modified oops. |
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292 // The CT and MUT bits saves this information for the individual Klasses. |
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293 void record_modified_oops() { _modified_oops = 1; } |
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294 void clear_modified_oops() { _modified_oops = 0; } |
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295 bool has_modified_oops() { return _modified_oops == 1; } |
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296 |
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297 void accumulate_modified_oops() { if (has_modified_oops()) _accumulated_modified_oops = 1; } |
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298 void clear_accumulated_modified_oops() { _accumulated_modified_oops = 0; } |
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299 bool has_accumulated_modified_oops() { return _accumulated_modified_oops == 1; } |
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300 |
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301 protected: // internal accessors |
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302 Klass* subklass_oop() const { return _subklass; } |
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303 Klass* next_sibling_oop() const { return _next_sibling; } |
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304 void set_subklass(Klass* s); |
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305 void set_next_sibling(Klass* s); |
0 | 306 |
307 public: | |
308 // Allocation profiling support | |
309 juint alloc_count() const { return _alloc_count; } | |
310 void set_alloc_count(juint n) { _alloc_count = n; } | |
311 virtual juint alloc_size() const = 0; | |
312 virtual void set_alloc_size(juint n) = 0; | |
313 | |
314 // Compiler support | |
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315 static ByteSize super_offset() { return in_ByteSize(offset_of(Klass, _super)); } |
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316 static ByteSize super_check_offset_offset() { return in_ByteSize(offset_of(Klass, _super_check_offset)); } |
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317 static ByteSize primary_supers_offset() { return in_ByteSize(offset_of(Klass, _primary_supers)); } |
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318 static ByteSize secondary_super_cache_offset() { return in_ByteSize(offset_of(Klass, _secondary_super_cache)); } |
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319 static ByteSize secondary_supers_offset() { return in_ByteSize(offset_of(Klass, _secondary_supers)); } |
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320 static ByteSize java_mirror_offset() { return in_ByteSize(offset_of(Klass, _java_mirror)); } |
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321 static ByteSize modifier_flags_offset() { return in_ByteSize(offset_of(Klass, _modifier_flags)); } |
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322 static ByteSize layout_helper_offset() { return in_ByteSize(offset_of(Klass, _layout_helper)); } |
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323 static ByteSize access_flags_offset() { return in_ByteSize(offset_of(Klass, _access_flags)); } |
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324 #ifdef GRAAL |
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325 static ByteSize graal_mirror_offset() { return in_ByteSize(offset_of(Klass, _graal_mirror)); } |
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326 static ByteSize next_sibling_offset() { return in_ByteSize(offset_of(Klass, _next_sibling)); } |
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327 static ByteSize subklass_offset() { return in_ByteSize(offset_of(Klass, _subklass)); } |
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328 #endif |
0 | 329 |
330 // Unpacking layout_helper: | |
331 enum { | |
332 _lh_neutral_value = 0, // neutral non-array non-instance value | |
333 _lh_instance_slow_path_bit = 0x01, | |
334 _lh_log2_element_size_shift = BitsPerByte*0, | |
335 _lh_log2_element_size_mask = BitsPerLong-1, | |
336 _lh_element_type_shift = BitsPerByte*1, | |
337 _lh_element_type_mask = right_n_bits(BitsPerByte), // shifted mask | |
338 _lh_header_size_shift = BitsPerByte*2, | |
339 _lh_header_size_mask = right_n_bits(BitsPerByte), // shifted mask | |
340 _lh_array_tag_bits = 2, | |
341 _lh_array_tag_shift = BitsPerInt - _lh_array_tag_bits, | |
342 _lh_array_tag_type_value = ~0x00, // 0xC0000000 >> 30 | |
343 _lh_array_tag_obj_value = ~0x01 // 0x80000000 >> 30 | |
344 }; | |
345 | |
346 static int layout_helper_size_in_bytes(jint lh) { | |
347 assert(lh > (jint)_lh_neutral_value, "must be instance"); | |
348 return (int) lh & ~_lh_instance_slow_path_bit; | |
349 } | |
350 static bool layout_helper_needs_slow_path(jint lh) { | |
351 assert(lh > (jint)_lh_neutral_value, "must be instance"); | |
352 return (lh & _lh_instance_slow_path_bit) != 0; | |
353 } | |
354 static bool layout_helper_is_instance(jint lh) { | |
355 return (jint)lh > (jint)_lh_neutral_value; | |
356 } | |
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357 static bool layout_helper_is_array(jint lh) { |
0 | 358 return (jint)lh < (jint)_lh_neutral_value; |
359 } | |
360 static bool layout_helper_is_typeArray(jint lh) { | |
361 // _lh_array_tag_type_value == (lh >> _lh_array_tag_shift); | |
362 return (juint)lh >= (juint)(_lh_array_tag_type_value << _lh_array_tag_shift); | |
363 } | |
364 static bool layout_helper_is_objArray(jint lh) { | |
365 // _lh_array_tag_obj_value == (lh >> _lh_array_tag_shift); | |
366 return (jint)lh < (jint)(_lh_array_tag_type_value << _lh_array_tag_shift); | |
367 } | |
368 static int layout_helper_header_size(jint lh) { | |
369 assert(lh < (jint)_lh_neutral_value, "must be array"); | |
370 int hsize = (lh >> _lh_header_size_shift) & _lh_header_size_mask; | |
371 assert(hsize > 0 && hsize < (int)sizeof(oopDesc)*3, "sanity"); | |
372 return hsize; | |
373 } | |
374 static BasicType layout_helper_element_type(jint lh) { | |
375 assert(lh < (jint)_lh_neutral_value, "must be array"); | |
376 int btvalue = (lh >> _lh_element_type_shift) & _lh_element_type_mask; | |
377 assert(btvalue >= T_BOOLEAN && btvalue <= T_OBJECT, "sanity"); | |
378 return (BasicType) btvalue; | |
379 } | |
380 static int layout_helper_log2_element_size(jint lh) { | |
381 assert(lh < (jint)_lh_neutral_value, "must be array"); | |
382 int l2esz = (lh >> _lh_log2_element_size_shift) & _lh_log2_element_size_mask; | |
383 assert(l2esz <= LogBitsPerLong, "sanity"); | |
384 return l2esz; | |
385 } | |
386 static jint array_layout_helper(jint tag, int hsize, BasicType etype, int log2_esize) { | |
387 return (tag << _lh_array_tag_shift) | |
388 | (hsize << _lh_header_size_shift) | |
389 | ((int)etype << _lh_element_type_shift) | |
390 | (log2_esize << _lh_log2_element_size_shift); | |
391 } | |
392 static jint instance_layout_helper(jint size, bool slow_path_flag) { | |
393 return (size << LogHeapWordSize) | |
394 | (slow_path_flag ? _lh_instance_slow_path_bit : 0); | |
395 } | |
396 static int layout_helper_to_size_helper(jint lh) { | |
397 assert(lh > (jint)_lh_neutral_value, "must be instance"); | |
398 // Note that the following expression discards _lh_instance_slow_path_bit. | |
399 return lh >> LogHeapWordSize; | |
400 } | |
401 // Out-of-line version computes everything based on the etype: | |
402 static jint array_layout_helper(BasicType etype); | |
403 | |
404 // What is the maximum number of primary superclasses any klass can have? | |
405 #ifdef PRODUCT | |
406 static juint primary_super_limit() { return _primary_super_limit; } | |
407 #else | |
408 static juint primary_super_limit() { | |
409 assert(FastSuperclassLimit <= _primary_super_limit, "parameter oob"); | |
410 return FastSuperclassLimit; | |
411 } | |
412 #endif | |
413 | |
414 // vtables | |
415 virtual klassVtable* vtable() const { return NULL; } | |
416 | |
417 // subclass check | |
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418 bool is_subclass_of(Klass* k) const; |
0 | 419 // subtype check: true if is_subclass_of, or if k is interface and receiver implements it |
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420 bool is_subtype_of(Klass* k) const { |
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421 juint off = k->super_check_offset(); |
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422 Klass* sup = *(Klass**)( (address)this + off ); |
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423 const juint secondary_offset = in_bytes(secondary_super_cache_offset()); |
0 | 424 if (sup == k) { |
425 return true; | |
426 } else if (off != secondary_offset) { | |
427 return false; | |
428 } else { | |
429 return search_secondary_supers(k); | |
430 } | |
431 } | |
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432 bool search_secondary_supers(Klass* k) const; |
0 | 433 |
605 | 434 // Find LCA in class hierarchy |
0 | 435 Klass *LCA( Klass *k ); |
436 | |
437 // Check whether reflection/jni/jvm code is allowed to instantiate this class; | |
438 // if not, throw either an Error or an Exception. | |
439 virtual void check_valid_for_instantiation(bool throwError, TRAPS); | |
440 | |
441 // array copying | |
442 virtual void copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS); | |
443 | |
444 // tells if the class should be initialized | |
445 virtual bool should_be_initialized() const { return false; } | |
446 // initializes the klass | |
447 virtual void initialize(TRAPS); | |
448 // lookup operation for MethodLookupCache | |
449 friend class MethodLookupCache; | |
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450 virtual Method* uncached_lookup_method(Symbol* name, Symbol* signature) const; |
0 | 451 public: |
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452 Method* lookup_method(Symbol* name, Symbol* signature) const { |
0 | 453 return uncached_lookup_method(name, signature); |
454 } | |
455 | |
456 // array class with specific rank | |
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457 Klass* array_klass(int rank, TRAPS) { return array_klass_impl(false, rank, THREAD); } |
0 | 458 |
459 // array class with this klass as element type | |
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460 Klass* array_klass(TRAPS) { return array_klass_impl(false, THREAD); } |
0 | 461 |
462 // These will return NULL instead of allocating on the heap: | |
463 // NB: these can block for a mutex, like other functions with TRAPS arg. | |
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464 Klass* array_klass_or_null(int rank); |
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465 Klass* array_klass_or_null(); |
0 | 466 |
467 virtual oop protection_domain() { return NULL; } | |
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468 |
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469 oop class_loader() const; |
0 | 470 |
7409 | 471 virtual oop klass_holder() const { return class_loader(); } |
472 | |
0 | 473 protected: |
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474 virtual Klass* array_klass_impl(bool or_null, int rank, TRAPS); |
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475 virtual Klass* array_klass_impl(bool or_null, TRAPS); |
0 | 476 |
477 public: | |
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478 // CDS support - remove and restore oops from metadata. Oops are not shared. |
0 | 479 virtual void remove_unshareable_info(); |
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480 virtual void restore_unshareable_info(TRAPS); |
0 | 481 |
482 protected: | |
483 // computes the subtype relationship | |
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484 virtual bool compute_is_subtype_of(Klass* k); |
0 | 485 public: |
486 // ALL FUNCTIONS BELOW THIS POINT ARE DISPATCHED FROM AN OOP | |
487 // These functions describe behavior for the oop not the KLASS. | |
488 | |
489 // actual oop size of obj in memory | |
490 virtual int oop_size(oop obj) const = 0; | |
491 | |
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492 // Size of klass in word size. |
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493 virtual int size() const = 0; |
7956 | 494 #if INCLUDE_SERVICES |
495 virtual void collect_statistics(KlassSizeStats *sz) const; | |
496 #endif | |
0 | 497 |
498 // Returns the Java name for a class (Resource allocated) | |
499 // For arrays, this returns the name of the element with a leading '['. | |
500 // For classes, this returns the name with the package separators | |
501 // turned into '.'s. | |
502 const char* external_name() const; | |
503 // Returns the name for a class (Resource allocated) as the class | |
504 // would appear in a signature. | |
505 // For arrays, this returns the name of the element with a leading '['. | |
506 // For classes, this returns the name with a leading 'L' and a trailing ';' | |
507 // and the package separators as '/'. | |
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508 virtual const char* signature_name() const; |
0 | 509 |
510 // garbage collection support | |
511 virtual void oop_follow_contents(oop obj) = 0; | |
512 virtual int oop_adjust_pointers(oop obj) = 0; | |
513 | |
514 // Parallel Scavenge and Parallel Old | |
515 PARALLEL_GC_DECLS_PV | |
516 | |
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517 // type testing operations |
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518 protected: |
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519 virtual bool oop_is_instance_slow() const { return false; } |
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520 virtual bool oop_is_array_slow() const { return false; } |
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521 virtual bool oop_is_objArray_slow() const { return false; } |
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522 virtual bool oop_is_typeArray_slow() const { return false; } |
0 | 523 public: |
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524 virtual bool oop_is_instanceMirror() const { return false; } |
0 | 525 virtual bool oop_is_instanceRef() const { return false; } |
526 | |
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527 // Fast non-virtual versions |
0 | 528 #ifndef ASSERT |
529 #define assert_same_query(xval, xcheck) xval | |
530 #else | |
531 private: | |
532 static bool assert_same_query(bool xval, bool xslow) { | |
533 assert(xval == xslow, "slow and fast queries agree"); | |
534 return xval; | |
535 } | |
536 public: | |
537 #endif | |
538 inline bool oop_is_instance() const { return assert_same_query( | |
539 layout_helper_is_instance(layout_helper()), | |
540 oop_is_instance_slow()); } | |
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541 inline bool oop_is_array() const { return assert_same_query( |
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542 layout_helper_is_array(layout_helper()), |
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543 oop_is_array_slow()); } |
0 | 544 inline bool oop_is_objArray() const { return assert_same_query( |
545 layout_helper_is_objArray(layout_helper()), | |
546 oop_is_objArray_slow()); } | |
547 inline bool oop_is_typeArray() const { return assert_same_query( | |
548 layout_helper_is_typeArray(layout_helper()), | |
549 oop_is_typeArray_slow()); } | |
550 #undef assert_same_query | |
551 | |
552 // Access flags | |
553 AccessFlags access_flags() const { return _access_flags; } | |
554 void set_access_flags(AccessFlags flags) { _access_flags = flags; } | |
555 | |
556 bool is_public() const { return _access_flags.is_public(); } | |
557 bool is_final() const { return _access_flags.is_final(); } | |
558 bool is_interface() const { return _access_flags.is_interface(); } | |
559 bool is_abstract() const { return _access_flags.is_abstract(); } | |
560 bool is_super() const { return _access_flags.is_super(); } | |
561 bool is_synthetic() const { return _access_flags.is_synthetic(); } | |
562 void set_is_synthetic() { _access_flags.set_is_synthetic(); } | |
563 bool has_finalizer() const { return _access_flags.has_finalizer(); } | |
564 bool has_final_method() const { return _access_flags.has_final_method(); } | |
565 void set_has_finalizer() { _access_flags.set_has_finalizer(); } | |
566 void set_has_final_method() { _access_flags.set_has_final_method(); } | |
567 bool is_cloneable() const { return _access_flags.is_cloneable(); } | |
568 void set_is_cloneable() { _access_flags.set_is_cloneable(); } | |
569 bool has_vanilla_constructor() const { return _access_flags.has_vanilla_constructor(); } | |
570 void set_has_vanilla_constructor() { _access_flags.set_has_vanilla_constructor(); } | |
571 bool has_miranda_methods () const { return access_flags().has_miranda_methods(); } | |
572 void set_has_miranda_methods() { _access_flags.set_has_miranda_methods(); } | |
573 | |
574 // Biased locking support | |
575 // Note: the prototype header is always set up to be at least the | |
576 // prototype markOop. If biased locking is enabled it may further be | |
577 // biasable and have an epoch. | |
578 markOop prototype_header() const { return _prototype_header; } | |
579 // NOTE: once instances of this klass are floating around in the | |
580 // system, this header must only be updated at a safepoint. | |
581 // NOTE 2: currently we only ever set the prototype header to the | |
582 // biasable prototype for instanceKlasses. There is no technical | |
583 // reason why it could not be done for arrayKlasses aside from | |
584 // wanting to reduce the initial scope of this optimization. There | |
585 // are potential problems in setting the bias pattern for | |
586 // JVM-internal oops. | |
587 inline void set_prototype_header(markOop header); | |
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588 static ByteSize prototype_header_offset() { return in_ByteSize(offset_of(Klass, _prototype_header)); } |
0 | 589 |
590 int biased_lock_revocation_count() const { return (int) _biased_lock_revocation_count; } | |
591 // Atomically increments biased_lock_revocation_count and returns updated value | |
592 int atomic_incr_biased_lock_revocation_count(); | |
593 void set_biased_lock_revocation_count(int val) { _biased_lock_revocation_count = (jint) val; } | |
594 jlong last_biased_lock_bulk_revocation_time() { return _last_biased_lock_bulk_revocation_time; } | |
595 void set_last_biased_lock_bulk_revocation_time(jlong cur_time) { _last_biased_lock_bulk_revocation_time = cur_time; } | |
596 | |
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597 TRACE_DEFINE_KLASS_METHODS; |
0 | 598 |
599 // garbage collection support | |
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600 virtual void oops_do(OopClosure* cl); |
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601 |
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602 // Iff the class loader (or mirror for anonymous classes) is alive the |
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603 // Klass is considered alive. |
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604 // The is_alive closure passed in depends on the Garbage Collector used. |
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605 bool is_loader_alive(BoolObjectClosure* is_alive); |
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606 |
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607 static void clean_weak_klass_links(BoolObjectClosure* is_alive); |
0 | 608 |
609 // Prefetch within oop iterators. This is a macro because we | |
610 // can't guarantee that the compiler will inline it. In 64-bit | |
611 // it generally doesn't. Signature is | |
612 // | |
613 // static void prefetch_beyond(oop* const start, | |
614 // oop* const end, | |
615 // const intx foffset, | |
616 // const Prefetch::style pstyle); | |
617 #define prefetch_beyond(start, end, foffset, pstyle) { \ | |
618 const intx foffset_ = (foffset); \ | |
619 const Prefetch::style pstyle_ = (pstyle); \ | |
620 assert(foffset_ > 0, "prefetch beyond, not behind"); \ | |
621 if (pstyle_ != Prefetch::do_none) { \ | |
622 oop* ref = (start); \ | |
623 if (ref < (end)) { \ | |
624 switch (pstyle_) { \ | |
625 case Prefetch::do_read: \ | |
626 Prefetch::read(*ref, foffset_); \ | |
627 break; \ | |
628 case Prefetch::do_write: \ | |
629 Prefetch::write(*ref, foffset_); \ | |
630 break; \ | |
631 default: \ | |
632 ShouldNotReachHere(); \ | |
633 break; \ | |
634 } \ | |
635 } \ | |
636 } \ | |
637 } | |
638 | |
639 // iterators | |
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640 virtual int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) = 0; |
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641 virtual int oop_oop_iterate_v(oop obj, ExtendedOopClosure* blk) { |
0 | 642 return oop_oop_iterate(obj, blk); |
643 } | |
644 | |
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645 #if INCLUDE_ALL_GCS |
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646 // In case we don't have a specialized backward scanner use forward |
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647 // iteration. |
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648 virtual int oop_oop_iterate_backwards_v(oop obj, ExtendedOopClosure* blk) { |
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649 return oop_oop_iterate_v(obj, blk); |
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650 } |
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651 #endif // INCLUDE_ALL_GCS |
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652 |
0 | 653 // Iterates "blk" over all the oops in "obj" (of type "this") within "mr". |
654 // (I don't see why the _m should be required, but without it the Solaris | |
655 // C++ gives warning messages about overridings of the "oop_oop_iterate" | |
656 // defined above "hiding" this virtual function. (DLD, 6/20/00)) */ | |
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657 virtual int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) = 0; |
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658 virtual int oop_oop_iterate_v_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) { |
0 | 659 return oop_oop_iterate_m(obj, blk, mr); |
660 } | |
661 | |
662 // Versions of the above iterators specialized to particular subtypes | |
663 // of OopClosure, to avoid closure virtual calls. | |
664 #define Klass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ | |
665 virtual int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk) { \ | |
666 /* Default implementation reverts to general version. */ \ | |
667 return oop_oop_iterate(obj, blk); \ | |
668 } \ | |
669 \ | |
670 /* Iterates "blk" over all the oops in "obj" (of type "this") within "mr". \ | |
671 (I don't see why the _m should be required, but without it the Solaris \ | |
672 C++ gives warning messages about overridings of the "oop_oop_iterate" \ | |
673 defined above "hiding" this virtual function. (DLD, 6/20/00)) */ \ | |
674 virtual int oop_oop_iterate##nv_suffix##_m(oop obj, \ | |
675 OopClosureType* blk, \ | |
676 MemRegion mr) { \ | |
677 return oop_oop_iterate_m(obj, blk, mr); \ | |
678 } | |
679 | |
680 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_1(Klass_OOP_OOP_ITERATE_DECL) | |
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681 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_2(Klass_OOP_OOP_ITERATE_DECL) |
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682 |
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683 #if INCLUDE_ALL_GCS |
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684 #define Klass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ |
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685 virtual int oop_oop_iterate_backwards##nv_suffix(oop obj, \ |
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686 OopClosureType* blk) { \ |
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687 /* Default implementation reverts to general version. */ \ |
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688 return oop_oop_iterate_backwards_v(obj, blk); \ |
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689 } |
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690 |
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691 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_1(Klass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
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692 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_2(Klass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
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693 #endif // INCLUDE_ALL_GCS |
0 | 694 |
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695 virtual void array_klasses_do(void f(Klass* k)) {} |
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696 virtual void with_array_klasses_do(void f(Klass* k)); |
0 | 697 |
698 // Return self, except for abstract classes with exactly 1 | |
699 // implementor. Then return the 1 concrete implementation. | |
700 Klass *up_cast_abstract(); | |
701 | |
702 // klass name | |
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703 Symbol* name() const { return _name; } |
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704 void set_name(Symbol* n); |
0 | 705 |
706 public: | |
707 // jvm support | |
708 virtual jint compute_modifier_flags(TRAPS) const; | |
709 | |
710 // JVMTI support | |
711 virtual jint jvmti_class_status() const; | |
712 | |
713 // Printing | |
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714 virtual void print_on(outputStream* st) const; |
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715 |
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716 virtual void oop_print_value_on(oop obj, outputStream* st); |
0 | 717 virtual void oop_print_on (oop obj, outputStream* st); |
718 | |
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719 virtual const char* internal_name() const = 0; |
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720 |
0 | 721 // Verification |
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722 virtual void verify_on(outputStream* st); |
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723 void verify() { verify_on(tty); } |
0 | 724 |
725 #ifndef PRODUCT | |
726 void verify_vtable_index(int index); | |
727 #endif | |
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728 |
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729 virtual void oop_verify_on(oop obj, outputStream* st); |
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730 |
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731 private: |
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732 // barriers used by klass_oop_store |
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733 void klass_update_barrier_set(oop v); |
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734 void klass_update_barrier_set_pre(void* p, oop v); |
0 | 735 }; |
1972 | 736 |
737 #endif // SHARE_VM_OOPS_KLASS_HPP |