1 /* 2 * Copyright (c) 1997, 2019, 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_OOPS_TYPEARRAYOOP_HPP 26 #define SHARE_OOPS_TYPEARRAYOOP_HPP 27 28 #include "oops/arrayOop.hpp" 29 #include "oops/typeArrayKlass.hpp" 30 31 // A typeArrayOop is an array containing basic types (non oop elements). 32 // It is used for arrays of {characters, singles, doubles, bytes, shorts, integers, longs} 33 #include <limits.h> 34 35 namespace TypeToBT { 36 template<typename T> BasicType to_basic_type(); 37 template<> inline BasicType to_basic_type<jboolean>() { return T_BOOLEAN; } 38 template<> inline BasicType to_basic_type<jbyte>() { return T_BYTE; } 39 template<> inline BasicType to_basic_type<jchar>() { return T_CHAR; } 40 template<> inline BasicType to_basic_type<jshort>() { return T_SHORT; } 41 template<> inline BasicType to_basic_type<jint>() { return T_INT; } 42 template<> inline BasicType to_basic_type<jlong>() { return T_LONG; } 43 template<> inline BasicType to_basic_type<jfloat>() { return T_FLOAT; } 44 template<> inline BasicType to_basic_type<jdouble>() { return T_DOUBLE; } 45 }; 46 47 class typeArrayOopDesc : public arrayOopDesc { 48 private: 49 template <typename T> 50 static BasicType bt() { return TypeToBT::to_basic_type<T>(); } 51 52 protected: 53 jchar* char_base() const; 54 jboolean* bool_base() const; 55 jbyte* byte_base() const; 56 jint* int_base() const; 57 jlong* long_base() const; 58 jshort* short_base() const; 59 jfloat* float_base() const; 60 jdouble* double_base() const; 61 62 friend class TypeArrayKlass; 63 64 public: 65 template <typename T> 66 static ptrdiff_t element_offset(int index) { 67 return arrayOopDesc::base_offset_in_bytes(bt<T>()) + sizeof(T) * index; 68 } 69 70 jbyte* byte_at_addr(int which) const; 71 jboolean* bool_at_addr(int which) const; 72 jchar* char_at_addr(int which) const; 73 jint* int_at_addr(int which) const; 74 jshort* short_at_addr(int which) const; 75 jushort* ushort_at_addr(int which) const; 76 jlong* long_at_addr(int which) const; 77 jfloat* float_at_addr(int which) const; 78 jdouble* double_at_addr(int which) const; 79 80 jbyte byte_at(int which) const; 81 void byte_at_put(int which, jbyte contents); 82 83 jboolean bool_at(int which) const; 84 void bool_at_put(int which, jboolean contents); 85 86 jchar char_at(int which) const; 87 void char_at_put(int which, jchar contents); 88 89 jint int_at(int which) const; 90 void int_at_put(int which, jint contents); 91 92 jshort short_at(int which) const; 93 void short_at_put(int which, jshort contents); 94 95 jushort ushort_at(int which) const; 96 void ushort_at_put(int which, jushort contents); 97 98 jlong long_at(int which) const; 99 void long_at_put(int which, jlong contents); 100 101 jfloat float_at(int which) const; 102 void float_at_put(int which, jfloat contents); 103 104 jdouble double_at(int which) const; 105 void double_at_put(int which, jdouble contents); 106 107 jbyte byte_at_acquire(int which) const; 108 void release_byte_at_put(int which, jbyte contents); 109 110 Symbol* symbol_at(int which) const; 111 void symbol_at_put(int which, Symbol* contents); 112 113 // Sizing 114 115 // Returns the number of words necessary to hold an array of "len" 116 // elements each of the given "byte_size". 117 private: 118 static int object_size(int lh, int length) { 119 int instance_header_size = Klass::layout_helper_header_size(lh); 120 int element_shift = Klass::layout_helper_log2_element_size(lh); 121 DEBUG_ONLY(BasicType etype = Klass::layout_helper_element_type(lh)); 122 assert(length <= arrayOopDesc::max_array_length(etype), "no overflow"); 123 124 julong size_in_bytes = (juint)length; 125 size_in_bytes <<= element_shift; 126 size_in_bytes += instance_header_size; 127 julong size_in_words = ((size_in_bytes + (HeapWordSize-1)) >> LogHeapWordSize); 128 assert(size_in_words <= (julong)max_jint, "no overflow"); 129 130 return align_object_size((intptr_t)size_in_words); 131 } 132 133 public: 134 inline int object_size(const TypeArrayKlass* tk) const; 135 }; 136 137 #endif // SHARE_OOPS_TYPEARRAYOOP_HPP