1 /* 2 * Copyright (c) 1997, 2021, 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 #include <type_traits> 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 namespace TypeToBT { 38 template<typename T> BasicType to_basic_type(); 39 template<> inline BasicType to_basic_type<jboolean>() { return T_BOOLEAN; } 40 template<> inline BasicType to_basic_type<jbyte>() { return T_BYTE; } 41 template<> inline BasicType to_basic_type<jchar>() { return T_CHAR; } 42 template<> inline BasicType to_basic_type<jshort>() { return T_SHORT; } 43 template<> inline BasicType to_basic_type<jint>() { return T_INT; } 44 template<> inline BasicType to_basic_type<jlong>() { return T_LONG; } 45 template<> inline BasicType to_basic_type<jfloat>() { return T_FLOAT; } 46 template<> inline BasicType to_basic_type<jdouble>() { return T_DOUBLE; } 47 }; 48 49 class typeArrayOopDesc : public arrayOopDesc { 50 private: 51 template <typename T> 52 static BasicType bt() { return TypeToBT::to_basic_type<T>(); } 53 54 protected: 55 jchar* char_base() const; 56 jboolean* bool_base() const; 57 jbyte* byte_base() const; 58 jint* int_base() const; 59 jlong* long_base() const; 60 jshort* short_base() const; 61 jfloat* float_base() const; 62 jdouble* double_base() const; 63 64 friend class TypeArrayKlass; 65 66 public: 67 template <typename T> 68 static ptrdiff_t element_offset(int index) { 69 return arrayOopDesc::base_offset_in_bytes(bt<T>()) + sizeof(T) * index; 70 } 71 72 jbyte* byte_at_addr(int which) const; 73 jboolean* bool_at_addr(int which) const; 74 jchar* char_at_addr(int which) const; 75 jint* int_at_addr(int which) const; 76 jshort* short_at_addr(int which) const; 77 jushort* ushort_at_addr(int which) const; 78 jlong* long_at_addr(int which) const; 79 jfloat* float_at_addr(int which) const; 80 jdouble* double_at_addr(int which) const; 81 82 jbyte byte_at(int which) const; 83 void byte_at_put(int which, jbyte contents); 84 85 jboolean bool_at(int which) const; 86 void bool_at_put(int which, jboolean contents); 87 88 jchar char_at(int which) const; 89 void char_at_put(int which, jchar contents); 90 91 jint int_at(int which) const; 92 void int_at_put(int which, jint contents); 93 94 jshort short_at(int which) const; 95 void short_at_put(int which, jshort contents); 96 97 jushort ushort_at(int which) const; 98 void ushort_at_put(int which, jushort contents); 99 100 jlong long_at(int which) const; 101 void long_at_put(int which, jlong contents); 102 103 jfloat float_at(int which) const; 104 void float_at_put(int which, jfloat contents); 105 106 jdouble double_at(int which) const; 107 void double_at_put(int which, jdouble contents); 108 109 jbyte byte_at_acquire(int which) const; 110 void release_byte_at_put(int which, jbyte contents); 111 112 Symbol* symbol_at(int which) const; 113 void symbol_at_put(int which, Symbol* contents); 114 115 // Sizing 116 117 // Returns the number of words necessary to hold an array of "len" 118 // elements each of the given "byte_size". 119 private: 120 static size_t object_size(int lh, int length) { 121 int instance_header_size = Klass::layout_helper_header_size(lh); 122 int element_shift = Klass::layout_helper_log2_element_size(lh); 123 DEBUG_ONLY(BasicType etype = Klass::layout_helper_element_type(lh)); 124 assert(length <= arrayOopDesc::max_array_length(etype), "no overflow"); 125 126 julong size_in_bytes = (juint)length; 127 size_in_bytes <<= element_shift; 128 size_in_bytes += instance_header_size; 129 julong size_in_words = ((size_in_bytes + (HeapWordSize-1)) >> LogHeapWordSize); 130 assert(size_in_words <= (julong)max_jint, "no overflow"); 131 132 return align_object_size((size_t)size_in_words); 133 } 134 135 public: 136 inline size_t object_size(const TypeArrayKlass* tk) const; 137 }; 138 139 // See similar requirement for oopDesc. 140 static_assert(std::is_trivially_default_constructible<typeArrayOopDesc>::value, "required"); 141 142 #endif // SHARE_OOPS_TYPEARRAYOOP_HPP