1 /*
2 * Copyright (c) 2017, 2019, 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/ciField.hpp"
27 #include "ci/ciInlineKlass.hpp"
28 #include "ci/ciUtilities.inline.hpp"
29 #include "oops/inlineKlass.inline.hpp"
30
31 int ciInlineKlass::compute_nonstatic_fields() {
32 int result = ciInstanceKlass::compute_nonstatic_fields();
33 assert(super() == nullptr || !super()->has_nonstatic_fields(), "an inline type must not inherit fields from its superclass");
34
35 // Compute declared non-static fields (without flattening of inline type fields)
36 GrowableArray<ciField*>* fields = nullptr;
37 GUARDED_VM_ENTRY(fields = compute_nonstatic_fields_impl(nullptr, false /* no flattening */);)
38 Arena* arena = CURRENT_ENV->arena();
39 _declared_nonstatic_fields = (fields != nullptr) ? fields : new (arena) GrowableArray<ciField*>(arena, 0, 0, 0);
40 return result;
41 }
42
43 // Offset of the first field in the inline type
44 int ciInlineKlass::first_field_offset() const {
45 GUARDED_VM_ENTRY(return to_InlineKlass()->first_field_offset();)
46 }
47
48 // Returns the index of the field with the given offset. If the field at 'offset'
49 // belongs to a flat field, return the index of the field in the inline type of the flat field.
50 int ciInlineKlass::field_index_by_offset(int offset) {
51 assert(contains_field_offset(offset), "invalid field offset");
52 int best_offset = 0;
53 int best_index = -1;
54 // Search the field with the given offset
55 for (int i = 0; i < nof_declared_nonstatic_fields(); ++i) {
56 int field_offset = _declared_nonstatic_fields->at(i)->offset_in_bytes();
57 if (field_offset == offset) {
58 // Exact match
59 return i;
60 } else if (field_offset < offset && field_offset > best_offset) {
61 // No exact match. Save the index of the field with the closest offset that
62 // is smaller than the given field offset. This index corresponds to the
63 // flat field that holds the field we are looking for.
64 best_offset = field_offset;
65 best_index = i;
66 }
67 }
68 assert(best_index >= 0, "field not found");
69 assert(best_offset == offset || _declared_nonstatic_fields->at(best_index)->type()->is_inlinetype(), "offset should match for non-inline types");
70 return best_index;
71 }
72
73 // Are arrays containing this inline type flat arrays?
74 bool ciInlineKlass::flat_in_array() const {
75 GUARDED_VM_ENTRY(return to_InlineKlass()->flat_array();)
76 }
77
78 // Can this inline type be passed as multiple values?
79 bool ciInlineKlass::can_be_passed_as_fields() const {
80 GUARDED_VM_ENTRY(return to_InlineKlass()->can_be_passed_as_fields();)
81 }
82
83 // Can this inline type be returned as multiple values?
84 bool ciInlineKlass::can_be_returned_as_fields() const {
85 GUARDED_VM_ENTRY(return to_InlineKlass()->can_be_returned_as_fields();)
86 }
87
88 bool ciInlineKlass::is_empty() {
89 // Do not use InlineKlass::is_empty_inline_type here because it does
90 // consider the container empty even if fields of empty inline types
91 // are not flat
92 return nof_nonstatic_fields() == 0;
93 }
94
95 // When passing an inline type's fields as arguments, count the number
96 // of argument slots that are needed
97 int ciInlineKlass::inline_arg_slots() {
98 int slots = 0;
99 for (int j = 0; j < nof_nonstatic_fields(); j++) {
100 ciField* field = nonstatic_field_at(j);
101 slots += type2size[field->type()->basic_type()];
102 }
103 return slots;
104 }
105
106 // Offset of the default oop in the mirror
107 int ciInlineKlass::default_value_offset() const {
108 GUARDED_VM_ENTRY(return to_InlineKlass()->default_value_offset();)
109 }
110
111 ciInstance* ciInlineKlass::default_instance() const {
112 GUARDED_VM_ENTRY(
113 oop default_value = to_InlineKlass()->default_value();
114 return CURRENT_ENV->get_instance(default_value);
115 )
116 }
117
118 bool ciInlineKlass::contains_oops() const {
119 GUARDED_VM_ENTRY(return get_InlineKlass()->contains_oops();)
120 }
121
122 int ciInlineKlass::oop_count() const {
123 GUARDED_VM_ENTRY(return get_InlineKlass()->nonstatic_oop_count();)
124 }
125
126 address ciInlineKlass::pack_handler() const {
127 GUARDED_VM_ENTRY(return get_InlineKlass()->pack_handler();)
128 }
129
130 address ciInlineKlass::unpack_handler() const {
131 GUARDED_VM_ENTRY(return get_InlineKlass()->unpack_handler();)
132 }
133
134 InlineKlass* ciInlineKlass::get_InlineKlass() const {
135 GUARDED_VM_ENTRY(return to_InlineKlass();)
136 }
137