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