1 /* 2 * Copyright (c) 1997, 2012, 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 #ifndef SHARE_VM_OOPS_TYPEARRAYOOP_HPP 26 #define SHARE_VM_OOPS_TYPEARRAYOOP_HPP 27 28 #include "gc/shared/barrierSet.hpp" 29 #include "oops/arrayOop.hpp" 30 #include "oops/typeArrayKlass.hpp" 31 #include "runtime/orderAccess.inline.hpp" 32 33 // A typeArrayOop is an array containing basic types (non oop elements). 34 // It is used for arrays of {characters, singles, doubles, bytes, shorts, integers, longs} 35 #include <limits.h> 36 37 class typeArrayOopDesc : public arrayOopDesc { 38 protected: 39 jchar* char_base() const { return (jchar*) base(T_CHAR); } 40 jboolean* bool_base() const { return (jboolean*)base(T_BOOLEAN); } 41 jbyte* byte_base() const { return (jbyte*) base(T_BYTE); } 42 jint* int_base() const { return (jint*) base(T_INT); } 43 jlong* long_base() const { return (jlong*) base(T_LONG); } 44 jshort* short_base() const { return (jshort*) base(T_SHORT); } 45 jfloat* float_base() const { return (jfloat*) base(T_FLOAT); } 46 jdouble* double_base() const { return (jdouble*) base(T_DOUBLE); } 47 48 friend class TypeArrayKlass; 49 50 public: 51 jbyte* byte_at_addr(int which) const { 52 assert(is_within_bounds(which), "index out of bounds"); 53 return &byte_base()[which]; 54 } 55 56 jboolean* bool_at_addr(int which) const { 57 assert(is_within_bounds(which), "index out of bounds"); 58 return &bool_base()[which]; 59 } 60 61 jchar* char_at_addr(int which) const { 62 assert(is_within_bounds(which), "index out of bounds"); 63 return &char_base()[which]; 64 } 65 66 jint* int_at_addr(int which) const { 67 assert(is_within_bounds(which), "index out of bounds"); 68 return &int_base()[which]; 69 } 70 71 jshort* short_at_addr(int which) const { 72 assert(is_within_bounds(which), "index out of bounds"); 73 return &short_base()[which]; 74 } 75 76 jushort* ushort_at_addr(int which) const { // for field descriptor arrays 77 assert(is_within_bounds(which), "index out of bounds"); 78 return (jushort*) &short_base()[which]; 79 } 80 81 jlong* long_at_addr(int which) const { 82 assert(is_within_bounds(which), "index out of bounds"); 83 return &long_base()[which]; 84 } 85 86 jfloat* float_at_addr(int which) const { 87 assert(is_within_bounds(which), "index out of bounds"); 88 return &float_base()[which]; 89 } 90 91 jdouble* double_at_addr(int which) const { 92 assert(is_within_bounds(which), "index out of bounds"); 93 return &double_base()[which]; 94 } 95 96 jbyte byte_at(int which) const { 97 typeArrayOop p = typeArrayOop(oopDesc::bs()->read_barrier((oop) this)); 98 return *p->byte_at_addr(which); 99 } 100 void byte_at_put(int which, jbyte contents) { 101 typeArrayOop p = typeArrayOop(oopDesc::bs()->write_barrier(this)); 102 *p->byte_at_addr(which) = contents; 103 } 104 105 jboolean bool_at(int which) const { 106 typeArrayOop p = typeArrayOop(oopDesc::bs()->read_barrier((oop) this)); 107 return *p->bool_at_addr(which); 108 } 109 void bool_at_put(int which, jboolean contents) { 110 typeArrayOop p = typeArrayOop(oopDesc::bs()->write_barrier(this)); 111 *p->bool_at_addr(which) = contents; 112 } 113 114 jchar char_at(int which) const { 115 typeArrayOop p = typeArrayOop(oopDesc::bs()->read_barrier((oop) this)); 116 return *p->char_at_addr(which); 117 } 118 void char_at_put(int which, jchar contents) { 119 typeArrayOop p = typeArrayOop(oopDesc::bs()->write_barrier(this)); 120 *p->char_at_addr(which) = contents; 121 } 122 123 jint int_at(int which) const { 124 typeArrayOop p = typeArrayOop(oopDesc::bs()->read_barrier((oop) this)); 125 return *p->int_at_addr(which); 126 } 127 void int_at_put(int which, jint contents) { 128 typeArrayOop p = typeArrayOop(oopDesc::bs()->write_barrier(this)); 129 *p->int_at_addr(which) = contents; 130 } 131 132 jshort short_at(int which) const { 133 typeArrayOop p = typeArrayOop(oopDesc::bs()->read_barrier((oop) this)); 134 return *p->short_at_addr(which); 135 } 136 void short_at_put(int which, jshort contents) { 137 typeArrayOop p = typeArrayOop(oopDesc::bs()->write_barrier(this)); 138 *p->short_at_addr(which) = contents; 139 } 140 141 jushort ushort_at(int which) const { 142 typeArrayOop p = typeArrayOop(oopDesc::bs()->read_barrier((oop) this)); 143 return *p->ushort_at_addr(which); 144 } 145 void ushort_at_put(int which, jushort contents) { 146 typeArrayOop p = typeArrayOop(oopDesc::bs()->write_barrier(this)); 147 *p->ushort_at_addr(which) = contents; 148 } 149 150 jlong long_at(int which) const { 151 typeArrayOop p = typeArrayOop(oopDesc::bs()->read_barrier((oop) this)); 152 return *p->long_at_addr(which); 153 } 154 void long_at_put(int which, jlong contents) { 155 typeArrayOop p = typeArrayOop(oopDesc::bs()->write_barrier(this)); 156 *p->long_at_addr(which) = contents; 157 } 158 159 jfloat float_at(int which) const { 160 typeArrayOop p = typeArrayOop(oopDesc::bs()->read_barrier((oop) this)); 161 return *p->float_at_addr(which); 162 } 163 void float_at_put(int which, jfloat contents) { 164 typeArrayOop p = typeArrayOop(oopDesc::bs()->write_barrier(this)); 165 *p->float_at_addr(which) = contents; 166 } 167 168 jdouble double_at(int which) const { 169 typeArrayOop p = typeArrayOop(oopDesc::bs()->read_barrier((oop) this)); 170 return *p->double_at_addr(which); 171 } 172 void double_at_put(int which, jdouble contents) { 173 typeArrayOop p = typeArrayOop(oopDesc::bs()->write_barrier(this)); 174 *p->double_at_addr(which) = contents; 175 } 176 177 jbyte byte_at_acquire(int which) const { 178 typeArrayOop p = typeArrayOop(oopDesc::bs()->read_barrier((oop) this)); 179 return OrderAccess::load_acquire(p->byte_at_addr(which)); 180 } 181 void release_byte_at_put(int which, jbyte contents) { 182 typeArrayOop p = typeArrayOop(oopDesc::bs()->write_barrier(this)); 183 OrderAccess::release_store(p->byte_at_addr(which), contents); 184 } 185 186 // Java thinks metadata arrays are just arrays of either long or int, since 187 // there doesn't seem to be T_ADDRESS, so this is a bit of unfortunate 188 // casting 189 #ifdef _LP64 190 Metadata* metadata_at(int which) const { 191 typeArrayOop p = typeArrayOop(oopDesc::bs()->read_barrier((oop) this)); 192 return (Metadata*)*p->long_at_addr(which); 193 } 194 void metadata_at_put(int which, Metadata* contents) { 195 typeArrayOop p = typeArrayOop(oopDesc::bs()->write_barrier(this)); 196 *p->long_at_addr(which) = (long)contents; 197 } 198 #else 199 Metadata* metadata_at(int which) const { 200 typeArrayOop p = typeArrayOop(oopDesc::bs()->read_barrier((oop) this)); 201 return (Metadata*)*p->int_at_addr(which); 202 } 203 void metadata_at_put(int which, Metadata* contents) { 204 typeArrayOop p = typeArrayOop(oopDesc::bs()->write_barrier(this)); 205 *p->int_at_addr(which) = (int)contents; 206 } 207 #endif // _LP64 208 209 // Sizing 210 211 // Returns the number of words necessary to hold an array of "len" 212 // elements each of the given "byte_size". 213 private: 214 static int object_size(int lh, int length) { 215 int instance_header_size = Klass::layout_helper_header_size(lh); 216 int element_shift = Klass::layout_helper_log2_element_size(lh); 217 DEBUG_ONLY(BasicType etype = Klass::layout_helper_element_type(lh)); 218 assert(length <= arrayOopDesc::max_array_length(etype), "no overflow"); 219 220 julong size_in_bytes = (juint)length; 221 size_in_bytes <<= element_shift; 222 size_in_bytes += instance_header_size; 223 julong size_in_words = ((size_in_bytes + (HeapWordSize-1)) >> LogHeapWordSize); 224 assert(size_in_words <= (julong)max_jint, "no overflow"); 225 226 return align_object_size((intptr_t)size_in_words); 227 } 228 229 public: 230 int object_size() { 231 TypeArrayKlass* tk = TypeArrayKlass::cast(klass()); 232 return object_size(tk->layout_helper(), length()); 233 } 234 }; 235 236 #endif // SHARE_VM_OOPS_TYPEARRAYOOP_HPP