1 /* 2 * Copyright (c) 2015, 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/symbolTable.hpp" 27 #include "classfile/systemDictionary.hpp" 28 #include "classfile/vmSymbols.hpp" 29 #include "gc/shared/collectedHeap.hpp" 30 #include "gc/shared/collectedHeap.inline.hpp" 31 #include "memory/metadataFactory.hpp" 32 #include "memory/resourceArea.hpp" 33 #include "memory/universe.hpp" 34 #include "memory/universe.inline.hpp" 35 #include "oops/instanceKlass.hpp" 36 #include "oops/klass.inline.hpp" 37 #include "oops/objArrayKlass.hpp" 38 #include "oops/oop.inline.hpp" 39 #include "oops/arrayKlass.hpp" 40 #include "oops/arrayOop.hpp" 41 #include "oops/valueKlass.hpp" 42 #include "oops/valueArrayOop.hpp" 43 #include "runtime/handles.inline.hpp" 44 #include "runtime/orderAccess.inline.hpp" 45 #include "utilities/macros.hpp" 46 47 #include "oops/valueArrayKlass.hpp" 48 49 // Allocation... 50 51 ValueArrayKlass::ValueArrayKlass(KlassHandle element_klass_handle, Symbol* name) : ArrayKlass(name) { 52 Klass* k = element_klass_handle(); 53 assert(k->is_value(), "Expected Value"); 54 set_element_klass(ValueKlass::cast(k)); 55 set_class_loader_data(k->class_loader_data()); 56 57 set_layout_helper(array_layout_helper(element_klass())); 58 assert(is_array_klass(), "sanity"); 59 assert(is_valueArray_klass(), "sanity"); 60 61 CMH("tweak name symbol refcnt ?") 62 #ifndef PRODUCT 63 if (PrintValueArrayLayout) { 64 print(); 65 } 66 #endif 67 } 68 69 ValueArrayKlass* ValueArrayKlass::allocate_klass(KlassHandle element_klass, 70 Symbol* name, 71 TRAPS) { 72 assert(ValueArrayFlatten, "Flatten array not allowed"); 73 assert(ValueKlass::cast(element_klass())->is_atomic() || (!ValueArrayAtomicAccess), "Atomic by-default"); 74 75 ClassLoaderData* loader_data = element_klass->class_loader_data(); 76 int size = ArrayKlass::static_size(ValueArrayKlass::header_size()); 77 ValueArrayKlass* vak = new (loader_data, size, THREAD) ValueArrayKlass(element_klass, name); 78 if (vak == NULL) { 79 return NULL; 80 } 81 loader_data->add_class(vak); 82 complete_create_array_klass(vak, vak->super(), CHECK_NULL); 83 return vak; 84 } 85 86 ValueArrayKlass* ValueArrayKlass::allocate_klass(KlassHandle element_klass, TRAPS) { 87 Symbol* name = ArrayKlass::create_element_klass_array_name(element_klass, CHECK_NULL); 88 return allocate_klass(element_klass, name, THREAD); 89 } 90 91 // Oops allocation... 92 valueArrayOop ValueArrayKlass::allocate_array(int length, 93 bool do_zero, 94 TRAPS) { 95 CMH("this is virtually identical in all arrayKlasses, refactor") 96 if (length < 0) { 97 THROW_0(vmSymbols::java_lang_NegativeArraySizeException()); 98 } 99 if (length > max_elements()) { 100 report_java_out_of_memory("Requested array size exceeds VM limit"); 101 JvmtiExport::post_array_size_exhausted(); 102 THROW_OOP_0(Universe::out_of_memory_error_array_size()); 103 } 104 105 size_t size = valueArrayOopDesc::object_size(layout_helper(), length); 106 KlassHandle h_k(THREAD, this); 107 valueArrayOop array; 108 CollectedHeap* ch = Universe::heap(); 109 if (do_zero) { 110 array = (valueArrayOop)CollectedHeap::array_allocate(h_k, (int)size, length, CHECK_NULL); 111 } else { 112 array = (valueArrayOop)CollectedHeap::array_allocate_nozero(h_k, (int)size, length, CHECK_NULL); 113 } 114 return array; 115 } 116 117 118 oop ValueArrayKlass::multi_allocate(int rank, jint* last_size, TRAPS) { 119 // For valueArrays this is only called for the last dimension 120 assert(rank == 1, "just checking"); 121 int length = *last_size; 122 return allocate_array(length, true, THREAD); 123 } 124 125 jint ValueArrayKlass::array_layout_helper(ValueKlass* vk) { 126 BasicType etype = T_VALUETYPE; 127 int atag = _lh_array_tag_type_value; 128 int esize = upper_log2(vk->raw_value_byte_size()); 129 int hsize = arrayOopDesc::base_offset_in_bytes(etype); 130 131 int lh = (atag << _lh_array_tag_shift) 132 | (1 << _lh_valuetype_bit) 133 | (hsize << _lh_header_size_shift) 134 | ((int)etype << _lh_element_type_shift) 135 | (esize); 136 137 #ifdef DEBUG 138 assert(lh < (int)_lh_neutral_value, "must look like an array layout"); 139 assert(layout_helper_is_array(lh), "correct kind"); 140 assert(layout_helper_is_valueArray(lh), "correct kind"); 141 assert(layout_helper_header_size(lh) == hsize, "correct decode"); 142 assert(layout_helper_element_type(lh) == etype, "correct decode"); 143 assert(layout_helper_is_typeArray(lh), "correct kind"); 144 assert(1 << layout_helper_log2_element_size(lh) == esize, "correct decode"); 145 #endif 146 return lh; 147 } 148 149 int ValueArrayKlass::oop_size(oop obj) const { 150 assert(obj->is_valueArray(),"must be a value array"); 151 valueArrayOop array = valueArrayOop(obj); 152 return array->object_size(); 153 } 154 155 jint ValueArrayKlass::max_elements() const { 156 return arrayOopDesc::max_array_length(arrayOopDesc::header_size(T_VALUETYPE), element_byte_size()); 157 } 158 159 oop ValueArrayKlass::protection_domain() const { 160 return element_klass()->protection_domain(); 161 } 162 163 void ValueArrayKlass::copy_array(arrayOop s, int src_pos, 164 arrayOop d, int dst_pos, int length, TRAPS) { 165 assert(s->is_valueArray(), "must be value array"); 166 167 // Check destination 168 if (!d->is_valueArray() || element_klass() != ValueArrayKlass::cast(d->klass())->element_klass()) { 169 THROW(vmSymbols::java_lang_ArrayStoreException()); 170 } 171 172 // Check is all offsets and lengths are non negative 173 if (src_pos < 0 || dst_pos < 0 || length < 0) { 174 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException()); 175 } 176 // Check if the ranges are valid 177 if ( (((unsigned int) length + (unsigned int) src_pos) > (unsigned int) s->length()) 178 || (((unsigned int) length + (unsigned int) dst_pos) > (unsigned int) d->length()) ) { 179 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException()); 180 } 181 // Check zero copy 182 if (length == 0) 183 return; 184 185 valueArrayOop da = valueArrayOop(d); 186 valueArrayOop sa = valueArrayOop(s); 187 int end_src_pos = src_pos + length; 188 while (src_pos < end_src_pos) { 189 element_klass()->value_store(sa->value_at_addr(src_pos++, layout_helper()), 190 da->value_at_addr(dst_pos++, layout_helper()), 191 true, 192 false); 193 } 194 } 195 196 197 Klass* ValueArrayKlass::array_klass_impl(bool or_null, int n, TRAPS) { 198 199 assert(dimension() <= n, "check order of chain"); 200 int dim = dimension(); 201 if (dim == n) return this; 202 203 if (higher_dimension() == NULL) { 204 if (or_null) return NULL; 205 206 ResourceMark rm; 207 JavaThread *jt = (JavaThread *)THREAD; 208 { 209 MutexLocker mc(Compile_lock, THREAD); // for vtables 210 // Ensure atomic creation of higher dimensions 211 MutexLocker mu(MultiArray_lock, THREAD); 212 213 // Check if another thread beat us 214 if (higher_dimension() == NULL) { 215 216 // Create multi-dim klass object and link them together 217 Klass* k = 218 ObjArrayKlass::allocate_objArray_klass(class_loader_data(), dim + 1, this, CHECK_NULL); 219 ObjArrayKlass* ak = ObjArrayKlass::cast(k); 220 ak->set_lower_dimension(this); 221 OrderAccess::storestore(); 222 set_higher_dimension(ak); 223 assert(ak->is_objArray_klass(), "incorrect initialization of ObjArrayKlass"); 224 } 225 } 226 } else { 227 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 228 } 229 230 ObjArrayKlass *ak = ObjArrayKlass::cast(higher_dimension()); 231 if (or_null) { 232 return ak->array_klass_or_null(n); 233 } 234 return ak->array_klass(n, THREAD); 235 } 236 237 Klass* ValueArrayKlass::array_klass_impl(bool or_null, TRAPS) { 238 return array_klass_impl(or_null, dimension() + 1, THREAD); 239 } 240 241 void ValueArrayKlass::print_on(outputStream* st) const { 242 #ifndef PRODUCT 243 assert(!is_objArray_klass(), "Unimplemented"); 244 245 st->print("Value Type Array: "); 246 Klass::print_on(st); 247 248 st->print(" - element klass: "); 249 element_klass()->print_value_on(st); 250 st->cr(); 251 252 int elem_size = element_byte_size(); 253 st->print(" - element size %i ", elem_size); 254 st->print("aligned layout size %i", 1 << layout_helper_log2_element_size(layout_helper())); 255 st->cr(); 256 #endif //PRODUCT 257 } 258 259 #ifndef PRODUCT 260 void ValueArrayKlass::oop_print_on(oop obj, outputStream* st) { 261 ArrayKlass::oop_print_on(obj, st); 262 valueArrayOop va = valueArrayOop(obj); 263 int print_len = MIN2((intx) va->length(), MaxElementPrintSize); 264 for(int index = 0; index < print_len; index++) { 265 st->print(" - %3d : ", index); 266 CMH("CMH: helper method for valueOop/valorind printing") 267 st->print(" CMH: helper method for valueOop/valorind printing"); 268 st->cr(); 269 } 270 int remaining = va->length() - print_len; 271 if (remaining > 0) { 272 st->print_cr(" - <%d more elements, increase MaxElementPrintSize to print>", remaining); 273 } 274 } 275 #endif //PRODUCT 276