1 /* 2 * Copyright (c) 1999, 2025, 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 "ci/ciArray.hpp" 26 #include "ci/ciArrayKlass.hpp" 27 #include "ci/ciConstant.hpp" 28 #include "ci/ciKlass.hpp" 29 #include "ci/ciUtilities.inline.hpp" 30 #include "oops/objArrayOop.inline.hpp" 31 #include "oops/oop.inline.hpp" 32 #include "oops/typeArrayOop.inline.hpp" 33 #include "utilities/powerOfTwo.hpp" 34 35 // ciArray 36 // 37 // This class represents an arrayOop in the HotSpot virtual 38 // machine. 39 static BasicType fixup_element_type(BasicType bt) { 40 if (bt == T_FLAT_ELEMENT) return T_OBJECT; 41 if (is_reference_type(bt)) return T_OBJECT; 42 if (bt == T_BOOLEAN) return T_BYTE; 43 return bt; 44 } 45 46 ciConstant ciArray::element_value_impl(BasicType elembt, 47 arrayOop ary, 48 int index) { 49 if (ary == nullptr) 50 return ciConstant(); 51 assert(ary->is_array(), ""); 52 if (index < 0 || index >= ary->length()) 53 return ciConstant(); 54 ArrayKlass* ak = (ArrayKlass*) ary->klass(); 55 BasicType abt = ak->element_type(); 56 if (fixup_element_type(elembt) != 57 fixup_element_type(abt)) 58 return ciConstant(); 59 switch (elembt) { 60 case T_ARRAY: 61 case T_OBJECT: 62 { 63 assert(ary->is_objArray(), ""); 64 objArrayOop objary = (objArrayOop) ary; 65 oop elem = objary->obj_at(index); 66 return ciConstant(elembt, CURRENT_ENV->get_object(elem)); 67 } 68 default: 69 break; 70 } 71 assert(ary->is_typeArray(), ""); 72 typeArrayOop tary = (typeArrayOop) ary; 73 jint value = 0; 74 switch (elembt) { 75 case T_LONG: return ciConstant(tary->long_at(index)); 76 case T_FLOAT: return ciConstant(tary->float_at(index)); 77 case T_DOUBLE: return ciConstant(tary->double_at(index)); 78 default: return ciConstant(); 79 case T_BYTE: value = tary->byte_at(index); break; 80 case T_BOOLEAN: value = tary->byte_at(index) & 1; break; 81 case T_SHORT: value = tary->short_at(index); break; 82 case T_CHAR: value = tary->char_at(index); break; 83 case T_INT: value = tary->int_at(index); break; 84 } 85 return ciConstant(elembt, value); 86 } 87 88 // ------------------------------------------------------------------ 89 // ciArray::element_value 90 // 91 // Current value of an element. 92 // Returns T_ILLEGAL if there is no element at the given index. 93 ciConstant ciArray::element_value(int index) { 94 BasicType elembt = element_basic_type(); 95 ciConstant value = check_constant_value_cache(index, elembt); 96 if (value.is_valid()) { 97 return value; 98 } 99 GUARDED_VM_ENTRY( 100 value = element_value_impl(elembt, get_arrayOop(), index); 101 ) 102 add_to_constant_value_cache(index, value); 103 return value; 104 } 105 106 // ------------------------------------------------------------------ 107 // ciArray::element_value_by_offset 108 // 109 // Current value of an element at the specified offset. 110 // Returns T_ILLEGAL if there is no element at the given offset. 111 ciConstant ciArray::element_value_by_offset(intptr_t element_offset) { 112 BasicType elembt = element_basic_type(); 113 intptr_t shift = exact_log2(type2aelembytes(elembt)); 114 intptr_t header = arrayOopDesc::base_offset_in_bytes(elembt); 115 intptr_t index = (element_offset - header) >> shift; 116 intptr_t offset = header + ((intptr_t)index << shift); 117 if (offset != element_offset || index != (jint)index || index < 0 || index >= length()) { 118 return ciConstant(); 119 } 120 return element_value((jint) index); 121 } 122 123 bool ciArray::is_null_free() { 124 VM_ENTRY_MARK; 125 return get_oop()->is_null_free_array(); 126 } 127 128 bool ciArray::is_atomic() { 129 VM_ENTRY_MARK; 130 arrayOop oop = get_arrayOop(); 131 if (oop->is_refArray()) { 132 return oop->klass()->is_inline_klass(); 133 } 134 if (oop->is_flatArray()) { 135 FlatArrayKlass* fak = FlatArrayKlass::cast(oop->klass()); 136 if (fak->element_klass()->is_naturally_atomic() || fak->layout_kind() == LayoutKind::ATOMIC_FLAT || fak->layout_kind() == LayoutKind::NULLABLE_ATOMIC_FLAT) { 137 return true; 138 } 139 } 140 return false; 141 } 142 143 // ------------------------------------------------------------------ 144 // ciArray::print_impl 145 // 146 // Implementation of the print method. 147 void ciArray::print_impl(outputStream* st) { 148 st->print(" length=%d type=", length()); 149 klass()->print(st); 150 }