1 /* 2 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. 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 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/moduleEntry.hpp" 27 #include "classfile/packageEntry.hpp" 28 #include "classfile/symbolTable.hpp" 29 #include "classfile/systemDictionary.hpp" 30 #include "classfile/vmSymbols.hpp" 31 #include "gc/shared/collectedHeap.hpp" 32 #include "gc/shared/collectedHeap.inline.hpp" 33 #include "memory/metadataFactory.hpp" 34 #include "memory/resourceArea.hpp" 35 #include "memory/universe.hpp" 36 #include "memory/universe.inline.hpp" 37 #include "oops/instanceKlass.hpp" 38 #include "oops/klass.inline.hpp" 39 #include "oops/objArrayKlass.hpp" 40 #include "oops/oop.inline.hpp" 41 #include "oops/arrayKlass.hpp" 42 #include "oops/arrayOop.hpp" 43 #include "oops/valueKlass.hpp" 44 #include "oops/valueArrayOop.hpp" 45 #include "oops/verifyOopClosure.hpp" 46 #include "runtime/handles.inline.hpp" 47 #include "runtime/orderAccess.inline.hpp" 48 #include "utilities/macros.hpp" 49 50 #include "oops/valueArrayKlass.hpp" 51 52 // Allocation... 53 54 ValueArrayKlass::ValueArrayKlass(Klass* element_klass, Symbol* name) : ArrayKlass(name) { 55 assert(element_klass->is_value(), "Expected Value"); 56 57 set_element_klass(ValueKlass::cast(element_klass)); 58 set_class_loader_data(element_klass->class_loader_data()); 59 set_layout_helper(array_layout_helper(ValueKlass::cast(element_klass))); 60 61 assert((1 << Klass::layout_helper_log2_element_size(layout_helper())) >= 62 element_value_store_size(), "sanity"); 63 assert(is_array_klass(), "sanity"); 64 assert(is_valueArray_klass(), "sanity"); 65 66 CMH("tweak name symbol refcnt ?") 67 #ifndef PRODUCT 68 if (PrintValueArrayLayout) { 69 print(); 70 } 71 #endif 72 } 73 74 ValueKlass* ValueArrayKlass::element_klass() const { 75 return ValueKlass::cast(_element_klass); 76 } 77 78 void ValueArrayKlass::set_element_klass(Klass* k) { 79 _element_klass = k; 80 _element_value_store_size = ValueKlass::cast(k)->raw_value_byte_size(); 81 } 82 83 ValueArrayKlass* ValueArrayKlass::allocate_klass(Klass* element_klass, 84 Symbol* name, 85 TRAPS) { 86 assert(ValueArrayFlatten, "Flatten array required"); 87 assert(ValueKlass::cast(element_klass)->is_atomic() || (!ValueArrayAtomicAccess), "Atomic by-default"); 88 89 ClassLoaderData* loader_data = element_klass->class_loader_data(); 90 int size = ArrayKlass::static_size(ValueArrayKlass::header_size()); 91 ValueArrayKlass* vak = new (loader_data, size, THREAD) ValueArrayKlass(element_klass, name); 92 if (vak == NULL) { 93 return NULL; 94 } 95 loader_data->add_class(vak); 96 complete_create_array_klass(vak, vak->super(), vak->module(), CHECK_NULL); 97 return vak; 98 } 99 100 ValueArrayKlass* ValueArrayKlass::allocate_klass(Klass* element_klass, TRAPS) { 101 Symbol* name = ArrayKlass::create_element_klass_array_name(element_klass, CHECK_NULL); 102 return allocate_klass(element_klass, name, THREAD); 103 } 104 105 void ValueArrayKlass::initialize(TRAPS) { 106 element_klass()->initialize(THREAD); 107 } 108 109 // Oops allocation... 110 oop ValueArrayKlass::allocate(int length, bool do_zero, TRAPS) { 111 if (length < 0) { 112 THROW_0(vmSymbols::java_lang_NegativeArraySizeException()); 113 } 114 if (length > max_elements()) { 115 report_java_out_of_memory("Requested array size exceeds VM limit"); 116 JvmtiExport::post_array_size_exhausted(); 117 THROW_OOP_0(Universe::out_of_memory_error_array_size()); 118 } 119 120 size_t size = valueArrayOopDesc::object_size(layout_helper(), length); 121 if (do_zero) { 122 return CollectedHeap::array_allocate(this, (int)size, length, CHECK_NULL); 123 } else { 124 return CollectedHeap::array_allocate_nozero(this, (int)size, length, CHECK_NULL); 125 } 126 } 127 128 129 oop ValueArrayKlass::multi_allocate(int rank, jint* last_size, TRAPS) { 130 // For valueArrays this is only called for the last dimension 131 assert(rank == 1, "just checking"); 132 int length = *last_size; 133 return allocate(length, true, THREAD); 134 } 135 136 jint ValueArrayKlass::array_layout_helper(ValueKlass* vk) { 137 BasicType etype = T_VALUETYPE; 138 int atag = _lh_array_tag_vt_value; 139 int esize = upper_log2(vk->raw_value_byte_size()); 140 int hsize = arrayOopDesc::base_offset_in_bytes(etype); 141 142 int lh = (atag << _lh_array_tag_shift) 143 | (hsize << _lh_header_size_shift) 144 | ((int)etype << _lh_element_type_shift) 145 | ((esize) << _lh_log2_element_size_shift); 146 147 assert(lh < (int)_lh_neutral_value, "must look like an array layout"); 148 assert(layout_helper_is_array(lh), "correct kind"); 149 assert(layout_helper_is_valueArray(lh), "correct kind"); 150 assert(!layout_helper_is_typeArray(lh), "correct kind"); 151 assert(!layout_helper_is_objArray(lh), "correct kind"); 152 assert(layout_helper_header_size(lh) == hsize, "correct decode"); 153 assert(layout_helper_element_type(lh) == etype, "correct decode"); 154 assert(layout_helper_log2_element_size(lh) == esize, "correct decode"); 155 assert((1 << esize) < BytesPerLong || is_size_aligned(hsize, HeapWordsPerLong), "unaligned base"); 156 157 return lh; 158 } 159 160 int ValueArrayKlass::oop_size(oop obj) const { 161 assert(obj->is_valueArray(),"must be a value array"); 162 valueArrayOop array = valueArrayOop(obj); 163 return array->object_size(); 164 } 165 166 jint ValueArrayKlass::max_elements() const { 167 return arrayOopDesc::max_array_length(arrayOopDesc::header_size(T_VALUETYPE), element_byte_size()); 168 } 169 170 oop ValueArrayKlass::protection_domain() const { 171 return element_klass()->protection_domain(); 172 } 173 174 void ValueArrayKlass::copy_array(arrayOop s, int src_pos, 175 arrayOop d, int dst_pos, int length, TRAPS) { 176 assert(s->is_valueArray(), "must be value array"); 177 178 // Check destination 179 if (!d->is_valueArray() || element_klass() != ValueArrayKlass::cast(d->klass())->element_klass()) { 180 THROW(vmSymbols::java_lang_ArrayStoreException()); 181 } 182 183 // Check is all offsets and lengths are non negative 184 if (src_pos < 0 || dst_pos < 0 || length < 0) { 185 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException()); 186 } 187 // Check if the ranges are valid 188 if ( (((unsigned int) length + (unsigned int) src_pos) > (unsigned int) s->length()) 189 || (((unsigned int) length + (unsigned int) dst_pos) > (unsigned int) d->length()) ) { 190 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException()); 191 } 192 // Check zero copy 193 if (length == 0) 194 return; 195 196 valueArrayOop sa = valueArrayOop(s); 197 valueArrayOop da = valueArrayOop(d); 198 address src = (address) sa->value_at_addr(src_pos, layout_helper()); 199 address dst = (address) da->value_at_addr(dst_pos, layout_helper()); 200 if (contains_oops()) { 201 int elem_incr = 1 << log2_element_size(); 202 address src_end = src + (length << log2_element_size()); 203 while (src < src_end) { 204 element_klass()->value_store(src, dst, element_value_store_size(), true, false); 205 src += elem_incr; 206 dst += elem_incr; 207 } 208 } else { 209 // we are basically a type array...don't bother limiting element copy 210 // it would have to be a lot wasted space to be worth value_store() calls, need a setting here ? 211 Copy::conjoint_memory_atomic(src, dst, (size_t)length << log2_element_size()); 212 } 213 } 214 215 216 Klass* ValueArrayKlass::array_klass_impl(bool or_null, int n, TRAPS) { 217 218 assert(dimension() <= n, "check order of chain"); 219 int dim = dimension(); 220 if (dim == n) return this; 221 222 if (higher_dimension() == NULL) { 223 if (or_null) return NULL; 224 225 ResourceMark rm; 226 JavaThread *jt = (JavaThread *)THREAD; 227 { 228 MutexLocker mc(Compile_lock, THREAD); // for vtables 229 // Ensure atomic creation of higher dimensions 230 MutexLocker mu(MultiArray_lock, THREAD); 231 232 // Check if another thread beat us 233 if (higher_dimension() == NULL) { 234 235 // Create multi-dim klass object and link them together 236 Klass* k = 237 ObjArrayKlass::allocate_objArray_klass(class_loader_data(), dim + 1, this, CHECK_NULL); 238 ObjArrayKlass* ak = ObjArrayKlass::cast(k); 239 ak->set_lower_dimension(this); 240 OrderAccess::storestore(); 241 set_higher_dimension(ak); 242 assert(ak->is_objArray_klass(), "incorrect initialization of ObjArrayKlass"); 243 } 244 } 245 } else { 246 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 247 } 248 249 ObjArrayKlass *ak = ObjArrayKlass::cast(higher_dimension()); 250 if (or_null) { 251 return ak->array_klass_or_null(n); 252 } 253 return ak->array_klass(n, THREAD); 254 } 255 256 Klass* ValueArrayKlass::array_klass_impl(bool or_null, TRAPS) { 257 return array_klass_impl(or_null, dimension() + 1, THREAD); 258 } 259 260 ModuleEntry* ValueArrayKlass::module() const { 261 assert(element_klass() != NULL, "ObjArrayKlass returned unexpected NULL bottom_klass"); 262 // The array is defined in the module of its bottom class 263 return element_klass()->module(); 264 } 265 266 PackageEntry* ValueArrayKlass::package() const { 267 assert(element_klass() != NULL, "ObjArrayKlass returned unexpected NULL bottom_klass"); 268 return element_klass()->package(); 269 } 270 271 void ValueArrayKlass::print_on(outputStream* st) const { 272 #ifndef PRODUCT 273 assert(!is_objArray_klass(), "Unimplemented"); 274 275 st->print("Value Type Array: "); 276 Klass::print_on(st); 277 278 st->print(" - element klass: "); 279 element_klass()->print_value_on(st); 280 st->cr(); 281 282 int elem_size = element_byte_size(); 283 st->print(" - element size %i ", elem_size); 284 st->print("aligned layout size %i", 1 << layout_helper_log2_element_size(layout_helper())); 285 st->cr(); 286 #endif //PRODUCT 287 } 288 289 void ValueArrayKlass::print_value_on(outputStream* st) const { 290 assert(is_klass(), "must be klass"); 291 292 element_klass()->print_value_on(st); 293 st->print("[]"); 294 } 295 296 297 #ifndef PRODUCT 298 void ValueArrayKlass::oop_print_on(oop obj, outputStream* st) { 299 ArrayKlass::oop_print_on(obj, st); 300 valueArrayOop va = valueArrayOop(obj); 301 ValueKlass* vk = element_klass(); 302 int print_len = MIN2((intx) va->length(), MaxElementPrintSize); 303 for(int index = 0; index < print_len; index++) { 304 int off = (address) va->value_at_addr(index, layout_helper()) - (address) obj; 305 st->print_cr(" - Index %3d offset %3d: ", index, off); 306 oop obj = (oop) ((address)va->value_at_addr(index, layout_helper()) - vk->first_field_offset()); 307 FieldPrinter print_field(st, obj); 308 vk->do_nonstatic_fields(&print_field); 309 st->cr(); 310 } 311 int remaining = va->length() - print_len; 312 if (remaining > 0) { 313 st->print_cr(" - <%d more elements, increase MaxElementPrintSize to print>", remaining); 314 } 315 } 316 #endif //PRODUCT 317 318 void ValueArrayKlass::oop_print_value_on(oop obj, outputStream* st) { 319 assert(obj->is_valueArray(), "must be valueArray"); 320 st->print("a "); 321 element_klass()->print_value_on(st); 322 int len = valueArrayOop(obj)->length(); 323 st->print("[%d] ", len); 324 obj->print_address_on(st); 325 if (PrintMiscellaneous && (WizardMode || Verbose)) { 326 int lh = layout_helper(); 327 st->print("{"); 328 for (int i = 0; i < len; i++) { 329 if (i > 4) { 330 st->print("..."); break; 331 } 332 st->print(" " INTPTR_FORMAT, (intptr_t)(void*)valueArrayOop(obj)->value_at_addr(i , lh)); 333 } 334 st->print(" }"); 335 } 336 } 337 338 // Verification 339 340 void ValueArrayKlass::oop_verify_on(oop obj, outputStream* st) { 341 ArrayKlass::oop_verify_on(obj, st); 342 guarantee(obj->is_valueArray(), "must be valueArray"); 343 344 if (element_klass()->contains_oops()) { 345 valueArrayOop va = valueArrayOop(obj); 346 NoHeaderExtendedOopClosure wrapClosure(&VerifyOopClosure::verify_oop); 347 va->oop_iterate(&wrapClosure); 348 } 349 } 350 351 void ValueArrayKlass::verify_on(outputStream* st) { 352 ArrayKlass::verify_on(st); 353 guarantee(element_klass()->is_value(), "should be value type klass"); 354 }