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