30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "interpreter/linkResolver.hpp"
33 #include "memory/heapInspection.hpp"
34 #include "memory/metadataFactory.hpp"
35 #include "memory/oopFactory.hpp"
36 #include "memory/resourceArea.hpp"
37 #include "oops/constantPool.hpp"
38 #include "oops/instanceKlass.hpp"
39 #include "oops/objArrayKlass.hpp"
40 #include "oops/objArrayOop.inline.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "runtime/fieldType.hpp"
43 #include "runtime/init.hpp"
44 #include "runtime/javaCalls.hpp"
45 #include "runtime/signature.hpp"
46 #include "runtime/vframe.hpp"
47 #include "utilities/copy.hpp"
48
49 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
50 // Tags are RW but comment below applies to tags also.
51 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL);
52
53 int size = ConstantPool::size(length);
54
55 // CDS considerations:
56 // Allocate read-write but may be able to move to read-only at dumping time
57 // if all the klasses are resolved. The only other field that is writable is
58 // the resolved_references array, which is recreated at startup time.
59 // But that could be moved to InstanceKlass (although a pain to access from
60 // assembly code). Maybe it could be moved to the cpCache which is RW.
61 return new (loader_data, size, false, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags);
62 }
63
64 #ifdef ASSERT
65
66 // MetaspaceObj allocation invariant is calloc equivalent memory
67 // simple verification of this here (JVM_CONSTANT_Invalid == 0 )
68 static bool tag_array_is_zero_initialized(Array<u1>* tags) {
69 assert(tags != NULL, "invariant");
70 const int length = tags->length();
71 for (int index = 0; index < length; ++index) {
72 if (JVM_CONSTANT_Invalid != tags->at(index)) {
73 return false;
74 }
75 }
76 return true;
77 }
78
79 #endif
80
81 ConstantPool::ConstantPool(Array<u1>* tags) :
82 _tags(tags),
83 _length(tags->length()),
84 _flags(0) {
85
86 assert(_tags != NULL, "invariant");
87 assert(tags->length() == _length, "invariant");
88 assert(tag_array_is_zero_initialized(tags), "invariant");
89 assert(0 == _flags, "invariant");
90 assert(0 == version(), "invariant");
91 assert(NULL == _pool_holder, "invariant");
92 }
93
94 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) {
95 MetadataFactory::free_metadata(loader_data, cache());
96 set_cache(NULL);
97 MetadataFactory::free_array<u2>(loader_data, reference_map());
98 set_reference_map(NULL);
99
100 MetadataFactory::free_array<jushort>(loader_data, operands());
101 set_operands(NULL);
102
103 release_C_heap_structures();
104
105 // free tag array
106 MetadataFactory::free_array<u1>(loader_data, tags());
107 set_tags(NULL);
108 }
109
110 void ConstantPool::release_C_heap_structures() {
111 // walk constant pool and decrement symbol reference counts
112 unreference_symbols();
113 }
114
115 objArrayOop ConstantPool::resolved_references() const {
116 return (objArrayOop)JNIHandles::resolve(_resolved_references);
117 }
118
119 // Create resolved_references array and mapping array for original cp indexes
120 // The ldc bytecode was rewritten to have the resolved reference array index so need a way
121 // to map it back for resolving and some unlikely miscellaneous uses.
122 // The objects created by invokedynamic are appended to this list.
123 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
124 const intStack& reference_map,
125 int constant_pool_map_length,
126 TRAPS) {
127 // Initialized the resolved object cache.
128 int map_length = reference_map.length();
129 if (map_length > 0) {
130 // Only need mapping back to constant pool entries. The map isn't used for
131 // invokedynamic resolved_reference entries. For invokedynamic entries,
132 // the constant pool cache index has the mapping back to both the constant
133 // pool and to the resolved reference index.
134 if (constant_pool_map_length > 0) {
135 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK);
136
137 for (int i = 0; i < constant_pool_map_length; i++) {
138 int x = reference_map.at(i);
139 assert(x == (int)(jushort) x, "klass index is too big");
140 om->at_put(i, (jushort)x);
141 }
142 set_reference_map(om);
143 }
144
145 // Create Java array for holding resolved strings, methodHandles,
146 // methodTypes, invokedynamic and invokehandle appendix objects, etc.
147 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
148 Handle refs_handle (THREAD, (oop)stom); // must handleize.
149 set_resolved_references(loader_data->add_handle(refs_handle));
150 }
151 }
152
153 // CDS support. Create a new resolved_references array.
154 void ConstantPool::restore_unshareable_info(TRAPS) {
155 assert(is_constantPool(), "ensure C++ vtable is restored");
156
157 // Only create the new resolved references array if it hasn't been attempted before
158 if (resolved_references() != NULL) return;
159
160 // restore the C++ vtable from the shared archive
161 restore_vtable();
162
163 if (SystemDictionary::Object_klass_loaded()) {
164 // Recreate the object array and add to ClassLoaderData.
165 int map_length = resolved_reference_length();
166 if (map_length > 0) {
167 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
168 Handle refs_handle (THREAD, (oop)stom); // must handleize.
169
170 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
171 set_resolved_references(loader_data->add_handle(refs_handle));
172 }
173 }
174 }
175
176 void ConstantPool::remove_unshareable_info() {
177 // Resolved references are not in the shared archive.
178 // Save the length for restoration. It is not necessarily the same length
179 // as reference_map.length() if invokedynamic is saved.
180 set_resolved_reference_length(
181 resolved_references() != NULL ? resolved_references()->length() : 0);
182 set_resolved_references(NULL);
183 }
184
185 int ConstantPool::cp_to_object_index(int cp_index) {
186 // this is harder don't do this so much.
187 int i = reference_map()->find(cp_index);
188 // We might not find the index for jsr292 call.
189 return (i < 0) ? _no_index_sentinel : i;
190 }
191
192 void ConstantPool::string_at_put(int which, int obj_index, oop str) {
193 resolved_references()->obj_at_put(obj_index, str);
194 }
195
196 void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, Klass* k) {
197 ResourceMark rm;
198 int line_number = -1;
199 const char * source_file = NULL;
200 if (JavaThread::current()->has_last_Java_frame()) {
201 // try to identify the method which called this function.
202 vframeStream vfst(JavaThread::current());
212 // only print something if the classes are different
213 if (source_file != NULL) {
214 log_debug(class, resolve)("%s %s %s:%d",
215 this_cp->pool_holder()->external_name(),
216 k->external_name(), source_file, line_number);
217 } else {
218 log_debug(class, resolve)("%s %s",
219 this_cp->pool_holder()->external_name(),
220 k->external_name());
221 }
222 }
223 }
224
225 Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int which,
226 bool save_resolution_error, TRAPS) {
227 assert(THREAD->is_Java_thread(), "must be a Java thread");
228
229 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
230 // It is not safe to rely on the tag bit's here, since we don't have a lock, and
231 // the entry and tag is not updated atomicly.
232 CPSlot entry = this_cp->slot_at(which);
233 if (entry.is_resolved()) {
234 assert(entry.get_klass()->is_klass(), "must be");
235 // Already resolved - return entry.
236 return entry.get_klass();
237 }
238
239 // This tag doesn't change back to unresolved class unless at a safepoint.
240 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) {
241 // The original attempt to resolve this constant pool entry failed so find the
242 // class of the original error and throw another error of the same class
243 // (JVMS 5.4.3).
244 // If there is a detail message, pass that detail message to the error.
245 // The JVMS does not strictly require us to duplicate the same detail message,
246 // or any internal exception fields such as cause or stacktrace. But since the
247 // detail message is often a class name or other literal string, we will repeat it
248 // if we can find it in the symbol table.
249 throw_resolution_error(this_cp, which, CHECK_0);
250 ShouldNotReachHere();
251 }
252
253 Handle mirror_handle;
254 Symbol* name = entry.get_symbol();
255 Handle loader (THREAD, this_cp->pool_holder()->class_loader());
256 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain());
257 Klass* k = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD);
258 if (!HAS_PENDING_EXCEPTION) {
259 // preserve the resolved klass from unloading
260 mirror_handle = Handle(THREAD, k->java_mirror());
261 // Do access check for klasses
262 verify_constant_pool_resolve(this_cp, k, THREAD);
263 }
264
265 // Failed to resolve class. We must record the errors so that subsequent attempts
266 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
267 if (HAS_PENDING_EXCEPTION) {
268 if (save_resolution_error) {
269 save_and_throw_exception(this_cp, which, constantTag(JVM_CONSTANT_UnresolvedClass), CHECK_NULL);
270 // If CHECK_NULL above doesn't return the exception, that means that
271 // some other thread has beaten us and has resolved the class.
272 // To preserve old behavior, we return the resolved class.
273 entry = this_cp->resolved_klass_at(which);
274 assert(entry.is_resolved(), "must be resolved if exception was cleared");
275 assert(entry.get_klass()->is_klass(), "must be resolved to a klass");
276 return entry.get_klass();
277 } else {
278 return NULL; // return the pending exception
279 }
280 }
281
282 // Make this class loader depend upon the class loader owning the class reference
283 ClassLoaderData* this_key = this_cp->pool_holder()->class_loader_data();
284 this_key->record_dependency(k, CHECK_NULL); // Can throw OOM
285
286 // logging for class+resolve.
287 if (log_is_enabled(Debug, class, resolve)){
288 trace_class_resolution(this_cp, k);
289 }
290 this_cp->klass_at_put(which, k);
291 entry = this_cp->resolved_klass_at(which);
292 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point");
293 return entry.get_klass();
294 }
295
296
297 // Does not update ConstantPool* - to avoid any exception throwing. Used
298 // by compiler and exception handling. Also used to avoid classloads for
299 // instanceof operations. Returns NULL if the class has not been loaded or
300 // if the verification of constant pool failed
301 Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) {
302 CPSlot entry = this_cp->slot_at(which);
303 if (entry.is_resolved()) {
304 assert(entry.get_klass()->is_klass(), "must be");
305 return entry.get_klass();
306 } else {
307 assert(entry.is_unresolved(), "must be either symbol or klass");
308 Thread *thread = Thread::current();
309 Symbol* name = entry.get_symbol();
310 oop loader = this_cp->pool_holder()->class_loader();
311 oop protection_domain = this_cp->pool_holder()->protection_domain();
312 Handle h_prot (thread, protection_domain);
313 Handle h_loader (thread, loader);
314 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread);
315
316 if (k != NULL) {
317 // Make sure that resolving is legal
318 EXCEPTION_MARK;
319 // return NULL if verification fails
320 verify_constant_pool_resolve(this_cp, k, THREAD);
321 if (HAS_PENDING_EXCEPTION) {
322 CLEAR_PENDING_EXCEPTION;
323 return NULL;
324 }
325 return k;
326 } else {
327 return k;
328 }
329 }
471 int ConstantPool::name_ref_index_at(int which_nt) {
472 jint ref_index = name_and_type_at(which_nt);
473 return extract_low_short_from_int(ref_index);
474 }
475
476
477 int ConstantPool::signature_ref_index_at(int which_nt) {
478 jint ref_index = name_and_type_at(which_nt);
479 return extract_high_short_from_int(ref_index);
480 }
481
482
483 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
484 return klass_at(klass_ref_index_at(which), THREAD);
485 }
486
487
488 Symbol* ConstantPool::klass_name_at(int which) const {
489 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
490 "Corrupted constant pool");
491 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
492 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
493 // tag is not updated atomicly.
494 CPSlot entry = slot_at(which);
495 if (entry.is_resolved()) {
496 // Already resolved - return entry's name.
497 assert(entry.get_klass()->is_klass(), "must be");
498 return entry.get_klass()->name();
499 } else {
500 assert(entry.is_unresolved(), "must be either symbol or klass");
501 return entry.get_symbol();
502 }
503 }
504
505 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
506 jint ref_index = klass_ref_index_at(which);
507 return klass_at_noresolve(ref_index);
508 }
509
510 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
511 jint ref_index = uncached_klass_ref_index_at(which);
512 return klass_at_noresolve(ref_index);
513 }
514
515 char* ConstantPool::string_at_noresolve(int which) {
516 return unresolved_string_at(which)->as_C_string();
517 }
518
519 BasicType ConstantPool::basic_type_for_signature_at(int which) const {
520 return FieldType::basic_type(symbol_at(which));
521 }
522
833 // If the string has already been interned, this entry will be non-null
834 oop str = this_cp->resolved_references()->obj_at(obj_index);
835 if (str != NULL) return str;
836 Symbol* sym = this_cp->unresolved_string_at(which);
837 str = StringTable::intern(sym, CHECK_(NULL));
838 this_cp->string_at_put(which, obj_index, str);
839 assert(java_lang_String::is_instance(str), "must be string");
840 return str;
841 }
842
843
844 bool ConstantPool::klass_name_at_matches(const InstanceKlass* k, int which) {
845 // Names are interned, so we can compare Symbol*s directly
846 Symbol* cp_name = klass_name_at(which);
847 return (cp_name == k->name());
848 }
849
850
851 // Iterate over symbols and decrement ones which are Symbol*s
852 // This is done during GC.
853 // Only decrement the UTF8 symbols. Unresolved classes and strings point to
854 // these symbols but didn't increment the reference count.
855 void ConstantPool::unreference_symbols() {
856 for (int index = 1; index < length(); index++) { // Index 0 is unused
857 constantTag tag = tag_at(index);
858 if (tag.is_symbol()) {
859 symbol_at(index)->decrement_refcount();
860 }
861 }
862 }
863
864
865 // Compare this constant pool's entry at index1 to the constant pool
866 // cp2's entry at index2.
867 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2,
868 int index2, TRAPS) {
869
870 // The error tags are equivalent to non-error tags when comparing
871 jbyte t1 = tag_at(index1).non_error_value();
872 jbyte t2 = cp2->tag_at(index2).non_error_value();
873
1214 default:
1215 // all others take one constant pool entry
1216 src_i++;
1217 dest_i++;
1218 break;
1219 }
1220 }
1221 copy_operands(from_cp, to_cp, CHECK);
1222
1223 } // end copy_cp_to_impl()
1224
1225
1226 // Copy this constant pool's entry at from_i to the constant pool
1227 // to_cp's entry at to_i.
1228 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i,
1229 const constantPoolHandle& to_cp, int to_i,
1230 TRAPS) {
1231
1232 int tag = from_cp->tag_at(from_i).value();
1233 switch (tag) {
1234 case JVM_CONSTANT_Class:
1235 {
1236 Klass* k = from_cp->klass_at(from_i, CHECK);
1237 to_cp->klass_at_put(to_i, k);
1238 } break;
1239
1240 case JVM_CONSTANT_ClassIndex:
1241 {
1242 jint ki = from_cp->klass_index_at(from_i);
1243 to_cp->klass_index_at_put(to_i, ki);
1244 } break;
1245
1246 case JVM_CONSTANT_Double:
1247 {
1248 jdouble d = from_cp->double_at(from_i);
1249 to_cp->double_at_put(to_i, d);
1250 // double takes two constant pool entries so init second entry's tag
1251 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1252 } break;
1253
1254 case JVM_CONSTANT_Fieldref:
1255 {
1256 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1257 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1258 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1259 } break;
1288 case JVM_CONSTANT_Methodref:
1289 {
1290 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1291 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1292 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1293 } break;
1294
1295 case JVM_CONSTANT_NameAndType:
1296 {
1297 int name_ref_index = from_cp->name_ref_index_at(from_i);
1298 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1299 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1300 } break;
1301
1302 case JVM_CONSTANT_StringIndex:
1303 {
1304 jint si = from_cp->string_index_at(from_i);
1305 to_cp->string_index_at_put(to_i, si);
1306 } break;
1307
1308 case JVM_CONSTANT_UnresolvedClass:
1309 case JVM_CONSTANT_UnresolvedClassInError:
1310 {
1311 // Can be resolved after checking tag, so check the slot first.
1312 CPSlot entry = from_cp->slot_at(from_i);
1313 if (entry.is_resolved()) {
1314 assert(entry.get_klass()->is_klass(), "must be");
1315 // Already resolved
1316 to_cp->klass_at_put(to_i, entry.get_klass());
1317 } else {
1318 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol());
1319 }
1320 } break;
1321
1322 case JVM_CONSTANT_String:
1323 {
1324 Symbol* s = from_cp->unresolved_string_at(from_i);
1325 to_cp->unresolved_string_at_put(to_i, s);
1326 } break;
1327
1328 case JVM_CONSTANT_Utf8:
1329 {
1330 Symbol* s = from_cp->symbol_at(from_i);
1331 // Need to increase refcount, the old one will be thrown away and deferenced
1332 s->increment_refcount();
1333 to_cp->symbol_at_put(to_i, s);
1334 } break;
1335
1336 case JVM_CONSTANT_MethodType:
1337 case JVM_CONSTANT_MethodTypeInError:
1338 {
1339 jint k = from_cp->method_type_index_at(from_i);
1351 case JVM_CONSTANT_InvokeDynamic:
1352 {
1353 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
1354 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
1355 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1356 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1357 } break;
1358
1359 // Invalid is used as the tag for the second constant pool entry
1360 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1361 // not be seen by itself.
1362 case JVM_CONSTANT_Invalid: // fall through
1363
1364 default:
1365 {
1366 ShouldNotReachHere();
1367 } break;
1368 }
1369 } // end copy_entry_to()
1370
1371
1372 // Search constant pool search_cp for an entry that matches this
1373 // constant pool's entry at pattern_i. Returns the index of a
1374 // matching entry or zero (0) if there is no matching entry.
1375 int ConstantPool::find_matching_entry(int pattern_i,
1376 const constantPoolHandle& search_cp, TRAPS) {
1377
1378 // index zero (0) is not used
1379 for (int i = 1; i < search_cp->length(); i++) {
1380 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1381 if (found) {
1382 return i;
1383 }
1384 }
1385
1386 return 0; // entry not found; return unused index zero (0)
1387 } // end find_matching_entry()
1388
1389
1390 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool
1391 // cp2's bootstrap specifier at idx2.
1807 }
1808 }
1809 DBG(printf("\n"));
1810 bytes += ent_size;
1811 size += ent_size;
1812 }
1813 assert(size == cpool_size, "Size mismatch");
1814
1815 // Keep temorarily for debugging until it's stable.
1816 DBG(print_cpool_bytes(cnt, start_bytes));
1817 return (int)(bytes - start_bytes);
1818 } /* end copy_cpool_bytes */
1819
1820 #undef DBG
1821
1822
1823 void ConstantPool::set_on_stack(const bool value) {
1824 if (value) {
1825 // Only record if it's not already set.
1826 if (!on_stack()) {
1827 _flags |= _on_stack;
1828 MetadataOnStackMark::record(this);
1829 }
1830 } else {
1831 // Clearing is done single-threadedly.
1832 _flags &= ~_on_stack;
1833 }
1834 }
1835
1836 // JSR 292 support for patching constant pool oops after the class is linked and
1837 // the oop array for resolved references are created.
1838 // We can't do this during classfile parsing, which is how the other indexes are
1839 // patched. The other patches are applied early for some error checking
1840 // so only defer the pseudo_strings.
1841 void ConstantPool::patch_resolved_references(GrowableArray<Handle>* cp_patches) {
1842 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
1843 Handle patch = cp_patches->at(index);
1844 if (patch.not_null()) {
1845 assert (tag_at(index).is_string(), "should only be string left");
1846 // Patching a string means pre-resolving it.
1847 // The spelling in the constant pool is ignored.
1848 // The constant reference may be any object whatever.
1849 // If it is not a real interned string, the constant is referred
1850 // to as a "pseudo-string", and must be presented to the CP
1851 // explicitly, because it may require scavenging.
1852 int obj_index = cp_to_object_index(index);
1853 pseudo_string_at_put(index, obj_index, patch());
1888 #endif
1889
1890
1891 // Printing
1892
1893 void ConstantPool::print_on(outputStream* st) const {
1894 assert(is_constantPool(), "must be constantPool");
1895 st->print_cr("%s", internal_name());
1896 if (flags() != 0) {
1897 st->print(" - flags: 0x%x", flags());
1898 if (has_preresolution()) st->print(" has_preresolution");
1899 if (on_stack()) st->print(" on_stack");
1900 st->cr();
1901 }
1902 if (pool_holder() != NULL) {
1903 st->print_cr(" - holder: " INTPTR_FORMAT, p2i(pool_holder()));
1904 }
1905 st->print_cr(" - cache: " INTPTR_FORMAT, p2i(cache()));
1906 st->print_cr(" - resolved_references: " INTPTR_FORMAT, p2i(resolved_references()));
1907 st->print_cr(" - reference_map: " INTPTR_FORMAT, p2i(reference_map()));
1908
1909 for (int index = 1; index < length(); index++) { // Index 0 is unused
1910 ((ConstantPool*)this)->print_entry_on(index, st);
1911 switch (tag_at(index).value()) {
1912 case JVM_CONSTANT_Long :
1913 case JVM_CONSTANT_Double :
1914 index++; // Skip entry following eigth-byte constant
1915 }
1916
1917 }
1918 st->cr();
1919 }
1920
1921 // Print one constant pool entry
1922 void ConstantPool::print_entry_on(const int index, outputStream* st) {
1923 EXCEPTION_MARK;
1924 st->print(" - %3d : ", index);
1925 tag_at(index).print_on(st);
1926 st->print(" : ");
1927 switch (tag_at(index).value()) {
1949 break;
1950 case JVM_CONSTANT_Integer :
1951 st->print("%d", int_at(index));
1952 break;
1953 case JVM_CONSTANT_Float :
1954 st->print("%f", float_at(index));
1955 break;
1956 case JVM_CONSTANT_Long :
1957 st->print_jlong(long_at(index));
1958 break;
1959 case JVM_CONSTANT_Double :
1960 st->print("%lf", double_at(index));
1961 break;
1962 case JVM_CONSTANT_NameAndType :
1963 st->print("name_index=%d", name_ref_index_at(index));
1964 st->print(" signature_index=%d", signature_ref_index_at(index));
1965 break;
1966 case JVM_CONSTANT_Utf8 :
1967 symbol_at(index)->print_value_on(st);
1968 break;
1969 case JVM_CONSTANT_UnresolvedClass : // fall-through
1970 case JVM_CONSTANT_UnresolvedClassInError: {
1971 CPSlot entry = slot_at(index);
1972 if (entry.is_resolved()) {
1973 entry.get_klass()->print_value_on(st);
1974 } else {
1975 entry.get_symbol()->print_value_on(st);
1976 }
1977 }
1978 break;
1979 case JVM_CONSTANT_MethodHandle :
1980 case JVM_CONSTANT_MethodHandleInError :
1981 st->print("ref_kind=%d", method_handle_ref_kind_at(index));
1982 st->print(" ref_index=%d", method_handle_index_at(index));
1983 break;
1984 case JVM_CONSTANT_MethodType :
1985 case JVM_CONSTANT_MethodTypeInError :
1986 st->print("signature_index=%d", method_type_index_at(index));
1987 break;
1988 case JVM_CONSTANT_InvokeDynamic :
1989 {
1990 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index));
1991 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index));
1992 int argc = invoke_dynamic_argument_count_at(index);
1993 if (argc > 0) {
1994 for (int arg_i = 0; arg_i < argc; arg_i++) {
1995 int arg = invoke_dynamic_argument_index_at(index, arg_i);
2027 // Size Statistics
2028 void ConstantPool::collect_statistics(KlassSizeStats *sz) const {
2029 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this));
2030 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags()));
2031 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache()));
2032 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands()));
2033 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map()));
2034
2035 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes +
2036 sz->_cp_refmap_bytes;
2037 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes;
2038 }
2039 #endif // INCLUDE_SERVICES
2040
2041 // Verification
2042
2043 void ConstantPool::verify_on(outputStream* st) {
2044 guarantee(is_constantPool(), "object must be constant pool");
2045 for (int i = 0; i< length(); i++) {
2046 constantTag tag = tag_at(i);
2047 CPSlot entry = slot_at(i);
2048 if (tag.is_klass()) {
2049 if (entry.is_resolved()) {
2050 guarantee(entry.get_klass()->is_klass(), "should be klass");
2051 }
2052 } else if (tag.is_unresolved_klass()) {
2053 if (entry.is_resolved()) {
2054 guarantee(entry.get_klass()->is_klass(), "should be klass");
2055 }
2056 } else if (tag.is_symbol()) {
2057 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2058 } else if (tag.is_string()) {
2059 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2060 }
2061 }
2062 if (cache() != NULL) {
2063 // Note: cache() can be NULL before a class is completely setup or
2064 // in temporary constant pools used during constant pool merging
2065 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache");
2066 }
2067 if (pool_holder() != NULL) {
2068 // Note: pool_holder() can be NULL in temporary constant pools
2069 // used during constant pool merging
2070 guarantee(pool_holder()->is_klass(), "should be klass");
2071 }
2072 }
2073
2074
2075 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
2076 char *str = sym->as_utf8();
2077 unsigned int hash = compute_hash(str, sym->utf8_length());
2078 unsigned int index = hash % table_size();
|
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "interpreter/linkResolver.hpp"
33 #include "memory/heapInspection.hpp"
34 #include "memory/metadataFactory.hpp"
35 #include "memory/oopFactory.hpp"
36 #include "memory/resourceArea.hpp"
37 #include "oops/constantPool.hpp"
38 #include "oops/instanceKlass.hpp"
39 #include "oops/objArrayKlass.hpp"
40 #include "oops/objArrayOop.inline.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "runtime/fieldType.hpp"
43 #include "runtime/init.hpp"
44 #include "runtime/javaCalls.hpp"
45 #include "runtime/signature.hpp"
46 #include "runtime/vframe.hpp"
47 #include "utilities/copy.hpp"
48
49 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
50 // Add one extra element to tags for storing ConstantPool::flags().
51 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length+1, 0, CHECK_NULL);
52 int size = ConstantPool::size(length);
53 return new (loader_data, size, true, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags);
54 }
55
56 #ifdef ASSERT
57
58 // MetaspaceObj allocation invariant is calloc equivalent memory
59 // simple verification of this here (JVM_CONSTANT_Invalid == 0 )
60 static bool tag_array_is_zero_initialized(Array<u1>* tags) {
61 assert(tags != NULL, "invariant");
62 const int length = tags->length();
63 for (int index = 0; index < length; ++index) {
64 if (JVM_CONSTANT_Invalid != tags->at(index)) {
65 return false;
66 }
67 }
68 return true;
69 }
70
71 #endif
72
73 ConstantPool::ConstantPool(Array<u1>* tags) :
74 _tags(tags),
75 _length(tags->length()-1) {
76
77 assert(_tags != NULL, "invariant");
78 assert(tags->length()-1 == _length, "invariant"); // tags->at(_length) is flags()
79 assert(tag_array_is_zero_initialized(tags), "invariant");
80 assert(0 == flags(), "invariant");
81 assert(0 == version(), "invariant");
82 assert(NULL == _pool_holder, "invariant");
83 }
84
85 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) {
86 if (cache() != NULL) {
87 MetadataFactory::free_array<u2>(loader_data, reference_map());
88 set_reference_map(NULL);
89 MetadataFactory::free_metadata(loader_data, cache());
90 set_cache(NULL);
91 }
92
93 MetadataFactory::free_array<Klass*>(loader_data, resolved_klasses());
94 set_resolved_klasses(NULL);
95
96 MetadataFactory::free_array<jushort>(loader_data, operands());
97 set_operands(NULL);
98
99 release_C_heap_structures();
100
101 // free tag array
102 MetadataFactory::free_array<u1>(loader_data, tags());
103 set_tags(NULL);
104 }
105
106 void ConstantPool::release_C_heap_structures() {
107 // walk constant pool and decrement symbol reference counts
108 unreference_symbols();
109 }
110
111 objArrayOop ConstantPool::resolved_references() const {
112 return (objArrayOop)JNIHandles::resolve(_cache->resolved_references());
113 }
114
115 // Create resolved_references array and mapping array for original cp indexes
116 // The ldc bytecode was rewritten to have the resolved reference array index so need a way
117 // to map it back for resolving and some unlikely miscellaneous uses.
118 // The objects created by invokedynamic are appended to this list.
119 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
120 const intStack& reference_map,
121 int constant_pool_map_length,
122 TRAPS) {
123 // Initialized the resolved object cache.
124 int map_length = reference_map.length();
125 if (map_length > 0) {
126 // Only need mapping back to constant pool entries. The map isn't used for
127 // invokedynamic resolved_reference entries. For invokedynamic entries,
128 // the constant pool cache index has the mapping back to both the constant
129 // pool and to the resolved reference index.
130 if (constant_pool_map_length > 0) {
131 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK);
132
133 for (int i = 0; i < constant_pool_map_length; i++) {
134 int x = reference_map.at(i);
135 assert(x == (int)(jushort) x, "klass index is too big");
136 om->at_put(i, (jushort)x);
137 }
138 set_reference_map(om);
139 }
140
141 // Create Java array for holding resolved strings, methodHandles,
142 // methodTypes, invokedynamic and invokehandle appendix objects, etc.
143 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
144 Handle refs_handle (THREAD, (oop)stom); // must handleize.
145 set_resolved_references(loader_data->add_handle(refs_handle));
146 }
147 }
148
149 void ConstantPool::allocate_resolved_klasses(ClassLoaderData* loader_data, int num_klasses, TRAPS) {
150 // A ConstantPool can't possibly have 0xffff valid class entries,
151 // because entry #0 must be CONSTANT_Invalid, and each class entry must refer to a UTF8
152 // entry for the class's name. So at most we will have 0xfffe class entries.
153 // This allows us to use 0xffff (ConstantPool::_invalid_resolved_klass_index) to indicate
154 // UnresolvedKlass entries that are temporarily created during class redefinition.
155 assert(num_klasses < _invalid_resolved_klass_index, "sanity");
156 assert(resolved_klasses() == NULL, "sanity");
157 Array<Klass*>* rk = MetadataFactory::new_writeable_array<Klass*>(loader_data, num_klasses, CHECK);
158 set_resolved_klasses(rk);
159 }
160
161 void ConstantPool::initialize_unresolved_klasses(ClassLoaderData* loader_data, TRAPS) {
162 int len = length();
163 int num_klasses = 0;
164 for (int i = 1; i <len; i++) {
165 switch (tag_at(i).value()) {
166 case JVM_CONSTANT_ClassIndex:
167 {
168 const int class_index = klass_index_at(i);
169 unresolved_klass_at_put(i, class_index, num_klasses++);
170 }
171 break;
172 #ifndef PRODUCT
173 case JVM_CONSTANT_Class:
174 case JVM_CONSTANT_UnresolvedClass:
175 case JVM_CONSTANT_UnresolvedClassInError:
176 // All of these should have been reverted back to ClassIndex before calling
177 // this function.
178 ShouldNotReachHere();
179 #endif
180 }
181 }
182 allocate_resolved_klasses(loader_data, num_klasses, THREAD);
183 }
184
185 void ConstantPool::klass_at_put(int which, int name_index, int resolved_klass_index, Klass* k, Symbol* name) {
186 assert(is_within_bounds(which), "index out of bounds");
187 assert(is_within_bounds(name_index), "index out of bounds");
188 assert((resolved_klass_index & 0xffff0000) == 0, "must be");
189 *int_at_addr(which) =
190 build_int_from_shorts((jushort)resolved_klass_index, (jushort)name_index);
191
192 symbol_at_put(name_index, name);
193 name->increment_refcount();
194 Klass** adr = resolved_klasses()->adr_at(resolved_klass_index);
195 OrderAccess::release_store_ptr((Klass* volatile *)adr, k);
196
197 // The interpreter assumes when the tag is stored, the klass is resolved
198 // and the Klass* non-NULL, so we need hardware store ordering here.
199 if (k != NULL) {
200 release_tag_at_put(which, JVM_CONSTANT_Class);
201 } else {
202 release_tag_at_put(which, JVM_CONSTANT_UnresolvedClass);
203 }
204 }
205
206 // CDS support. Create a new resolved_references array.
207 void ConstantPool::restore_unshareable_info(TRAPS) {
208 assert(is_constantPool(), "ensure C++ vtable is restored");
209 assert(on_stack(), "should always be set for shared constant pools");
210 assert(is_shared_quick(), "should always be set for shared constant pools");
211
212 // Only create the new resolved references array if it hasn't been attempted before
213 if (resolved_references() != NULL) return;
214
215 // restore the C++ vtable from the shared archive
216 restore_vtable();
217
218 if (SystemDictionary::Object_klass_loaded()) {
219 // Recreate the object array and add to ClassLoaderData.
220 int map_length = resolved_reference_length();
221 if (map_length > 0) {
222 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
223 Handle refs_handle (THREAD, (oop)stom); // must handleize.
224
225 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
226 set_resolved_references(loader_data->add_handle(refs_handle));
227 }
228 }
229 }
230
231 void ConstantPool::remove_unshareable_info() {
232 // Resolved references are not in the shared archive.
233 // Save the length for restoration. It is not necessarily the same length
234 // as reference_map.length() if invokedynamic is saved.
235 set_resolved_reference_length(
236 resolved_references() != NULL ? resolved_references()->length() : 0);
237 set_resolved_references(NULL);
238
239 // Shared ConstantPools are in the RO region, so the _flags cannot be modified.
240 // The _on_stack flag is used to prevent ConstantPools from deallocation during
241 // class redefinition. Since shared ConstantPools cannot be deallocated anyway,
242 // we always set _on_stack to true to avoid having to change _flags during runtime.
243 _flags |= (_on_stack | _is_shared_quick);
244 }
245
246 int ConstantPool::cp_to_object_index(int cp_index) {
247 // this is harder don't do this so much.
248 int i = reference_map()->find(cp_index);
249 // We might not find the index for jsr292 call.
250 return (i < 0) ? _no_index_sentinel : i;
251 }
252
253 void ConstantPool::string_at_put(int which, int obj_index, oop str) {
254 resolved_references()->obj_at_put(obj_index, str);
255 }
256
257 void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, Klass* k) {
258 ResourceMark rm;
259 int line_number = -1;
260 const char * source_file = NULL;
261 if (JavaThread::current()->has_last_Java_frame()) {
262 // try to identify the method which called this function.
263 vframeStream vfst(JavaThread::current());
273 // only print something if the classes are different
274 if (source_file != NULL) {
275 log_debug(class, resolve)("%s %s %s:%d",
276 this_cp->pool_holder()->external_name(),
277 k->external_name(), source_file, line_number);
278 } else {
279 log_debug(class, resolve)("%s %s",
280 this_cp->pool_holder()->external_name(),
281 k->external_name());
282 }
283 }
284 }
285
286 Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int which,
287 bool save_resolution_error, TRAPS) {
288 assert(THREAD->is_Java_thread(), "must be a Java thread");
289
290 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
291 // It is not safe to rely on the tag bit's here, since we don't have a lock, and
292 // the entry and tag is not updated atomicly.
293 int value = *this_cp->int_at_addr(which);
294 int resolved_klass_index = extract_low_short_from_int(value);
295 int name_index = extract_high_short_from_int(value);
296 assert(this_cp->tag_at(name_index).is_symbol(), "sanity");
297
298 Klass* klass = this_cp->resolved_klasses()->at(resolved_klass_index);
299 if (klass != NULL) {
300 return klass;
301 }
302
303 // This tag doesn't change back to unresolved class unless at a safepoint.
304 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) {
305 // The original attempt to resolve this constant pool entry failed so find the
306 // class of the original error and throw another error of the same class
307 // (JVMS 5.4.3).
308 // If there is a detail message, pass that detail message to the error.
309 // The JVMS does not strictly require us to duplicate the same detail message,
310 // or any internal exception fields such as cause or stacktrace. But since the
311 // detail message is often a class name or other literal string, we will repeat it
312 // if we can find it in the symbol table.
313 throw_resolution_error(this_cp, which, CHECK_0);
314 ShouldNotReachHere();
315 }
316
317 Handle mirror_handle;
318 Symbol* name = this_cp->symbol_at(name_index);
319 Handle loader (THREAD, this_cp->pool_holder()->class_loader());
320 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain());
321 Klass* k = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD);
322 if (!HAS_PENDING_EXCEPTION) {
323 // preserve the resolved klass from unloading
324 mirror_handle = Handle(THREAD, k->java_mirror());
325 // Do access check for klasses
326 verify_constant_pool_resolve(this_cp, k, THREAD);
327 }
328
329 // Failed to resolve class. We must record the errors so that subsequent attempts
330 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
331 if (HAS_PENDING_EXCEPTION) {
332 if (save_resolution_error) {
333 save_and_throw_exception(this_cp, which, constantTag(JVM_CONSTANT_UnresolvedClass), CHECK_NULL);
334 // If CHECK_NULL above doesn't return the exception, that means that
335 // some other thread has beaten us and has resolved the class.
336 // To preserve old behavior, we return the resolved class.
337 klass = this_cp->resolved_klasses()->at(resolved_klass_index);
338 assert(klass != NULL, "must be resolved if exception was cleared");
339 return klass;
340 } else {
341 return NULL; // return the pending exception
342 }
343 }
344
345 // Make this class loader depend upon the class loader owning the class reference
346 ClassLoaderData* this_key = this_cp->pool_holder()->class_loader_data();
347 this_key->record_dependency(k, CHECK_NULL); // Can throw OOM
348
349 // logging for class+resolve.
350 if (log_is_enabled(Debug, class, resolve)){
351 trace_class_resolution(this_cp, k);
352 }
353 Klass** adr = this_cp->resolved_klasses()->adr_at(resolved_klass_index);
354 OrderAccess::release_store_ptr((Klass* volatile *)adr, k);
355 // The interpreter assumes when the tag is stored, the klass is resolved
356 // and the Klass* is a klass rather than a Symbol*, so we need
357 // hardware store ordering here.
358 this_cp->release_tag_at_put(which, JVM_CONSTANT_Class);
359 return k;
360 }
361
362
363 // Does not update ConstantPool* - to avoid any exception throwing. Used
364 // by compiler and exception handling. Also used to avoid classloads for
365 // instanceof operations. Returns NULL if the class has not been loaded or
366 // if the verification of constant pool failed
367 Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) {
368 int value = *this_cp->int_at_addr(which);
369 int resolved_klass_index = extract_low_short_from_int(value);
370 int name_index = extract_high_short_from_int(value);
371 assert(this_cp->tag_at(name_index).is_symbol(), "sanity");
372
373 Klass* k = this_cp->resolved_klasses()->at(resolved_klass_index);
374 if (k != NULL) {
375 return k;
376 } else {
377 Thread *thread = Thread::current();
378 Symbol* name = this_cp->symbol_at(name_index);
379 oop loader = this_cp->pool_holder()->class_loader();
380 oop protection_domain = this_cp->pool_holder()->protection_domain();
381 Handle h_prot (thread, protection_domain);
382 Handle h_loader (thread, loader);
383 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread);
384
385 if (k != NULL) {
386 // Make sure that resolving is legal
387 EXCEPTION_MARK;
388 // return NULL if verification fails
389 verify_constant_pool_resolve(this_cp, k, THREAD);
390 if (HAS_PENDING_EXCEPTION) {
391 CLEAR_PENDING_EXCEPTION;
392 return NULL;
393 }
394 return k;
395 } else {
396 return k;
397 }
398 }
540 int ConstantPool::name_ref_index_at(int which_nt) {
541 jint ref_index = name_and_type_at(which_nt);
542 return extract_low_short_from_int(ref_index);
543 }
544
545
546 int ConstantPool::signature_ref_index_at(int which_nt) {
547 jint ref_index = name_and_type_at(which_nt);
548 return extract_high_short_from_int(ref_index);
549 }
550
551
552 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
553 return klass_at(klass_ref_index_at(which), THREAD);
554 }
555
556
557 Symbol* ConstantPool::klass_name_at(int which) const {
558 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
559 "Corrupted constant pool");
560 int name_index = extract_high_short_from_int(*int_at_addr(which));
561 return symbol_at(name_index);
562 }
563
564 int ConstantPool::klass_name_index_at(int which) const {
565 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
566 "Corrupted constant pool");
567 int name_index = extract_high_short_from_int(*int_at_addr(which));
568 return name_index;
569 }
570
571 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
572 jint ref_index = klass_ref_index_at(which);
573 return klass_at_noresolve(ref_index);
574 }
575
576 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
577 jint ref_index = uncached_klass_ref_index_at(which);
578 return klass_at_noresolve(ref_index);
579 }
580
581 char* ConstantPool::string_at_noresolve(int which) {
582 return unresolved_string_at(which)->as_C_string();
583 }
584
585 BasicType ConstantPool::basic_type_for_signature_at(int which) const {
586 return FieldType::basic_type(symbol_at(which));
587 }
588
899 // If the string has already been interned, this entry will be non-null
900 oop str = this_cp->resolved_references()->obj_at(obj_index);
901 if (str != NULL) return str;
902 Symbol* sym = this_cp->unresolved_string_at(which);
903 str = StringTable::intern(sym, CHECK_(NULL));
904 this_cp->string_at_put(which, obj_index, str);
905 assert(java_lang_String::is_instance(str), "must be string");
906 return str;
907 }
908
909
910 bool ConstantPool::klass_name_at_matches(const InstanceKlass* k, int which) {
911 // Names are interned, so we can compare Symbol*s directly
912 Symbol* cp_name = klass_name_at(which);
913 return (cp_name == k->name());
914 }
915
916
917 // Iterate over symbols and decrement ones which are Symbol*s
918 // This is done during GC.
919 // Only decrement the UTF8 symbols. Strings point to
920 // these symbols but didn't increment the reference count.
921 void ConstantPool::unreference_symbols() {
922 for (int index = 1; index < length(); index++) { // Index 0 is unused
923 constantTag tag = tag_at(index);
924 if (tag.is_symbol()) {
925 symbol_at(index)->decrement_refcount();
926 }
927 }
928 }
929
930
931 // Compare this constant pool's entry at index1 to the constant pool
932 // cp2's entry at index2.
933 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2,
934 int index2, TRAPS) {
935
936 // The error tags are equivalent to non-error tags when comparing
937 jbyte t1 = tag_at(index1).non_error_value();
938 jbyte t2 = cp2->tag_at(index2).non_error_value();
939
1280 default:
1281 // all others take one constant pool entry
1282 src_i++;
1283 dest_i++;
1284 break;
1285 }
1286 }
1287 copy_operands(from_cp, to_cp, CHECK);
1288
1289 } // end copy_cp_to_impl()
1290
1291
1292 // Copy this constant pool's entry at from_i to the constant pool
1293 // to_cp's entry at to_i.
1294 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i,
1295 const constantPoolHandle& to_cp, int to_i,
1296 TRAPS) {
1297
1298 int tag = from_cp->tag_at(from_i).value();
1299 switch (tag) {
1300 case JVM_CONSTANT_ClassIndex:
1301 {
1302 jint ki = from_cp->klass_index_at(from_i);
1303 to_cp->klass_index_at_put(to_i, ki);
1304 } break;
1305
1306 case JVM_CONSTANT_Double:
1307 {
1308 jdouble d = from_cp->double_at(from_i);
1309 to_cp->double_at_put(to_i, d);
1310 // double takes two constant pool entries so init second entry's tag
1311 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1312 } break;
1313
1314 case JVM_CONSTANT_Fieldref:
1315 {
1316 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1317 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1318 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1319 } break;
1348 case JVM_CONSTANT_Methodref:
1349 {
1350 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1351 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1352 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1353 } break;
1354
1355 case JVM_CONSTANT_NameAndType:
1356 {
1357 int name_ref_index = from_cp->name_ref_index_at(from_i);
1358 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1359 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1360 } break;
1361
1362 case JVM_CONSTANT_StringIndex:
1363 {
1364 jint si = from_cp->string_index_at(from_i);
1365 to_cp->string_index_at_put(to_i, si);
1366 } break;
1367
1368 case JVM_CONSTANT_Class:
1369 case JVM_CONSTANT_UnresolvedClass:
1370 case JVM_CONSTANT_UnresolvedClassInError:
1371 {
1372 // Revert to JVM_CONSTANT_ClassIndex
1373 int name_index = extract_high_short_from_int(*from_cp->int_at_addr(from_i));
1374 assert(from_cp->tag_at(name_index).is_symbol(), "sanity");
1375 to_cp->klass_index_at_put(to_i, name_index);
1376 } break;
1377
1378 case JVM_CONSTANT_String:
1379 {
1380 Symbol* s = from_cp->unresolved_string_at(from_i);
1381 to_cp->unresolved_string_at_put(to_i, s);
1382 } break;
1383
1384 case JVM_CONSTANT_Utf8:
1385 {
1386 Symbol* s = from_cp->symbol_at(from_i);
1387 // Need to increase refcount, the old one will be thrown away and deferenced
1388 s->increment_refcount();
1389 to_cp->symbol_at_put(to_i, s);
1390 } break;
1391
1392 case JVM_CONSTANT_MethodType:
1393 case JVM_CONSTANT_MethodTypeInError:
1394 {
1395 jint k = from_cp->method_type_index_at(from_i);
1407 case JVM_CONSTANT_InvokeDynamic:
1408 {
1409 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
1410 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
1411 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1412 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1413 } break;
1414
1415 // Invalid is used as the tag for the second constant pool entry
1416 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1417 // not be seen by itself.
1418 case JVM_CONSTANT_Invalid: // fall through
1419
1420 default:
1421 {
1422 ShouldNotReachHere();
1423 } break;
1424 }
1425 } // end copy_entry_to()
1426
1427 // Search constant pool search_cp for an entry that matches this
1428 // constant pool's entry at pattern_i. Returns the index of a
1429 // matching entry or zero (0) if there is no matching entry.
1430 int ConstantPool::find_matching_entry(int pattern_i,
1431 const constantPoolHandle& search_cp, TRAPS) {
1432
1433 // index zero (0) is not used
1434 for (int i = 1; i < search_cp->length(); i++) {
1435 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1436 if (found) {
1437 return i;
1438 }
1439 }
1440
1441 return 0; // entry not found; return unused index zero (0)
1442 } // end find_matching_entry()
1443
1444
1445 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool
1446 // cp2's bootstrap specifier at idx2.
1862 }
1863 }
1864 DBG(printf("\n"));
1865 bytes += ent_size;
1866 size += ent_size;
1867 }
1868 assert(size == cpool_size, "Size mismatch");
1869
1870 // Keep temorarily for debugging until it's stable.
1871 DBG(print_cpool_bytes(cnt, start_bytes));
1872 return (int)(bytes - start_bytes);
1873 } /* end copy_cpool_bytes */
1874
1875 #undef DBG
1876
1877
1878 void ConstantPool::set_on_stack(const bool value) {
1879 if (value) {
1880 // Only record if it's not already set.
1881 if (!on_stack()) {
1882 assert(!is_shared_quick(), "should always be set for shared constant pools");
1883 _flags |= _on_stack;
1884 MetadataOnStackMark::record(this);
1885 }
1886 } else {
1887 // Clearing is done single-threadedly.
1888 if (!is_shared_quick()) {
1889 _flags &= ~_on_stack;
1890 }
1891 }
1892 }
1893
1894 // JSR 292 support for patching constant pool oops after the class is linked and
1895 // the oop array for resolved references are created.
1896 // We can't do this during classfile parsing, which is how the other indexes are
1897 // patched. The other patches are applied early for some error checking
1898 // so only defer the pseudo_strings.
1899 void ConstantPool::patch_resolved_references(GrowableArray<Handle>* cp_patches) {
1900 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
1901 Handle patch = cp_patches->at(index);
1902 if (patch.not_null()) {
1903 assert (tag_at(index).is_string(), "should only be string left");
1904 // Patching a string means pre-resolving it.
1905 // The spelling in the constant pool is ignored.
1906 // The constant reference may be any object whatever.
1907 // If it is not a real interned string, the constant is referred
1908 // to as a "pseudo-string", and must be presented to the CP
1909 // explicitly, because it may require scavenging.
1910 int obj_index = cp_to_object_index(index);
1911 pseudo_string_at_put(index, obj_index, patch());
1946 #endif
1947
1948
1949 // Printing
1950
1951 void ConstantPool::print_on(outputStream* st) const {
1952 assert(is_constantPool(), "must be constantPool");
1953 st->print_cr("%s", internal_name());
1954 if (flags() != 0) {
1955 st->print(" - flags: 0x%x", flags());
1956 if (has_preresolution()) st->print(" has_preresolution");
1957 if (on_stack()) st->print(" on_stack");
1958 st->cr();
1959 }
1960 if (pool_holder() != NULL) {
1961 st->print_cr(" - holder: " INTPTR_FORMAT, p2i(pool_holder()));
1962 }
1963 st->print_cr(" - cache: " INTPTR_FORMAT, p2i(cache()));
1964 st->print_cr(" - resolved_references: " INTPTR_FORMAT, p2i(resolved_references()));
1965 st->print_cr(" - reference_map: " INTPTR_FORMAT, p2i(reference_map()));
1966 st->print_cr(" - resolved_klasses: " INTPTR_FORMAT, p2i(resolved_klasses()));
1967
1968 for (int index = 1; index < length(); index++) { // Index 0 is unused
1969 ((ConstantPool*)this)->print_entry_on(index, st);
1970 switch (tag_at(index).value()) {
1971 case JVM_CONSTANT_Long :
1972 case JVM_CONSTANT_Double :
1973 index++; // Skip entry following eigth-byte constant
1974 }
1975
1976 }
1977 st->cr();
1978 }
1979
1980 // Print one constant pool entry
1981 void ConstantPool::print_entry_on(const int index, outputStream* st) {
1982 EXCEPTION_MARK;
1983 st->print(" - %3d : ", index);
1984 tag_at(index).print_on(st);
1985 st->print(" : ");
1986 switch (tag_at(index).value()) {
2008 break;
2009 case JVM_CONSTANT_Integer :
2010 st->print("%d", int_at(index));
2011 break;
2012 case JVM_CONSTANT_Float :
2013 st->print("%f", float_at(index));
2014 break;
2015 case JVM_CONSTANT_Long :
2016 st->print_jlong(long_at(index));
2017 break;
2018 case JVM_CONSTANT_Double :
2019 st->print("%lf", double_at(index));
2020 break;
2021 case JVM_CONSTANT_NameAndType :
2022 st->print("name_index=%d", name_ref_index_at(index));
2023 st->print(" signature_index=%d", signature_ref_index_at(index));
2024 break;
2025 case JVM_CONSTANT_Utf8 :
2026 symbol_at(index)->print_value_on(st);
2027 break;
2028 case JVM_CONSTANT_ClassIndex: {
2029 int name_index = *int_at_addr(index);
2030 st->print("klass_index=%d ", name_index);
2031 symbol_at(name_index)->print_value_on(st);
2032 }
2033 break;
2034 case JVM_CONSTANT_UnresolvedClass : // fall-through
2035 case JVM_CONSTANT_UnresolvedClassInError: {
2036 int value = *int_at_addr(index);
2037 int resolved_klass_index = extract_low_short_from_int(value);
2038 int name_index = extract_high_short_from_int(value);
2039 assert(tag_at(name_index).is_symbol(), "sanity");
2040
2041 Klass* klass = resolved_klasses()->at(resolved_klass_index);
2042 if (klass != NULL) {
2043 klass->print_value_on(st);
2044 } else {
2045 symbol_at(name_index)->print_value_on(st);
2046 }
2047 }
2048 break;
2049 case JVM_CONSTANT_MethodHandle :
2050 case JVM_CONSTANT_MethodHandleInError :
2051 st->print("ref_kind=%d", method_handle_ref_kind_at(index));
2052 st->print(" ref_index=%d", method_handle_index_at(index));
2053 break;
2054 case JVM_CONSTANT_MethodType :
2055 case JVM_CONSTANT_MethodTypeInError :
2056 st->print("signature_index=%d", method_type_index_at(index));
2057 break;
2058 case JVM_CONSTANT_InvokeDynamic :
2059 {
2060 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index));
2061 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index));
2062 int argc = invoke_dynamic_argument_count_at(index);
2063 if (argc > 0) {
2064 for (int arg_i = 0; arg_i < argc; arg_i++) {
2065 int arg = invoke_dynamic_argument_index_at(index, arg_i);
2097 // Size Statistics
2098 void ConstantPool::collect_statistics(KlassSizeStats *sz) const {
2099 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this));
2100 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags()));
2101 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache()));
2102 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands()));
2103 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map()));
2104
2105 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes +
2106 sz->_cp_refmap_bytes;
2107 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes;
2108 }
2109 #endif // INCLUDE_SERVICES
2110
2111 // Verification
2112
2113 void ConstantPool::verify_on(outputStream* st) {
2114 guarantee(is_constantPool(), "object must be constant pool");
2115 for (int i = 0; i< length(); i++) {
2116 constantTag tag = tag_at(i);
2117 if (tag.is_klass() || tag.is_unresolved_klass()) {
2118 guarantee(klass_name_at(i)->refcount() != 0, "should have nonzero reference count");
2119 } else if (tag.is_symbol()) {
2120 CPSlot entry = slot_at(i);
2121 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2122 } else if (tag.is_string()) {
2123 CPSlot entry = slot_at(i);
2124 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2125 }
2126 }
2127 if (cache() != NULL) {
2128 // Note: cache() can be NULL before a class is completely setup or
2129 // in temporary constant pools used during constant pool merging
2130 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache");
2131 }
2132 if (pool_holder() != NULL) {
2133 // Note: pool_holder() can be NULL in temporary constant pools
2134 // used during constant pool merging
2135 guarantee(pool_holder()->is_klass(), "should be klass");
2136 }
2137 }
2138
2139
2140 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
2141 char *str = sym->as_utf8();
2142 unsigned int hash = compute_hash(str, sym->utf8_length());
2143 unsigned int index = hash % table_size();
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