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