1 /*
2 * Copyright (c) 1999, 2017, 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 "precompiled.hpp"
26 #include "ci/ciArray.hpp"
27 #include "ci/ciArrayKlass.hpp"
28 #include "ci/ciConstant.hpp"
29 #include "ci/ciKlass.hpp"
30 #include "ci/ciUtilities.inline.hpp"
31 #include "oops/objArrayOop.inline.hpp"
32 #include "oops/oop.inline.hpp"
33 #include "oops/typeArrayOop.inline.hpp"
34
35 // ciArray
36 //
37 // This class represents an arrayOop in the HotSpot virtual
38 // machine.
fixup_element_type(BasicType bt)39 static BasicType fixup_element_type(BasicType bt) {
40 if (bt == T_ARRAY) return T_OBJECT;
41 if (bt == T_BOOLEAN) return T_BYTE;
42 return bt;
43 }
44
element_value_impl(BasicType elembt,arrayOop ary,int index)45 ciConstant ciArray::element_value_impl(BasicType elembt,
46 arrayOop ary,
47 int index) {
48 if (ary == NULL)
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 ciEnv* env = CURRENT_ENV;
66 ciObject* box = env->get_object(elem);
67 return ciConstant(T_OBJECT, box);
68 }
69 default:
70 break;
71 }
72 assert(ary->is_typeArray(), "");
73 typeArrayOop tary = (typeArrayOop) ary;
74 jint value = 0;
75 switch (elembt) {
76 case T_LONG: return ciConstant(tary->long_at(index));
77 case T_FLOAT: return ciConstant(tary->float_at(index));
78 case T_DOUBLE: return ciConstant(tary->double_at(index));
79 default: return ciConstant();
80 case T_BYTE: value = tary->byte_at(index); break;
81 case T_BOOLEAN: value = tary->byte_at(index) & 1; break;
82 case T_SHORT: value = tary->short_at(index); break;
83 case T_CHAR: value = tary->char_at(index); break;
84 case T_INT: value = tary->int_at(index); break;
85 }
86 return ciConstant(elembt, value);
87 }
88
89 // ------------------------------------------------------------------
90 // ciArray::element_value
91 //
92 // Current value of an element.
93 // Returns T_ILLEGAL if there is no element at the given index.
element_value(int index)94 ciConstant ciArray::element_value(int index) {
95 BasicType elembt = element_basic_type();
96 GUARDED_VM_ENTRY(
97 return element_value_impl(elembt, get_arrayOop(), index);
98 )
99 }
100
101 // ------------------------------------------------------------------
102 // ciArray::element_value_by_offset
103 //
104 // Current value of an element at the specified offset.
105 // Returns T_ILLEGAL if there is no element at the given offset.
element_value_by_offset(intptr_t element_offset)106 ciConstant ciArray::element_value_by_offset(intptr_t element_offset) {
107 BasicType elembt = element_basic_type();
108 intptr_t shift = exact_log2(type2aelembytes(elembt));
109 intptr_t header = arrayOopDesc::base_offset_in_bytes(elembt);
110 intptr_t index = (element_offset - header) >> shift;
111 intptr_t offset = header + ((intptr_t)index << shift);
112 if (offset != element_offset || index != (jint)index || index < 0 || index >= length()) {
113 return ciConstant();
114 }
115 return element_value((jint) index);
116 }
117
118 // ------------------------------------------------------------------
119 // ciArray::print_impl
120 //
121 // Implementation of the print method.
print_impl(outputStream * st)122 void ciArray::print_impl(outputStream* st) {
123 st->print(" length=%d type=", length());
124 klass()->print(st);
125 }
126