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
34 // Abstract value classes can also have declared fields.
35 ciInstanceKlass* super_klass = super();
36 GrowableArray<ciField*>* super_klass_fields = nullptr;
37 if (super_klass != nullptr && super_klass->has_nonstatic_fields()) {
38 int super_flen = super_klass->nof_nonstatic_fields();
39 super_klass_fields = super_klass->_nonstatic_fields;
40 assert(super_flen == 0 || super_klass_fields != nullptr, "first get nof_fields");
41 }
42
43 // Compute declared non-static fields (without flattening of inline type fields)
44 GrowableArray<ciField*>* fields = nullptr;
45 GUARDED_VM_ENTRY(fields = compute_nonstatic_fields_impl(super_klass_fields, false /* no flattening */);)
46 Arena* arena = CURRENT_ENV->arena();
47 _declared_nonstatic_fields = (fields != nullptr) ? fields : new (arena) GrowableArray<ciField*>(arena, 0, 0, 0);
48 return result;
49 }
50
51 // Offset of the first field in the inline type
52 int ciInlineKlass::first_field_offset() const {
53 GUARDED_VM_ENTRY(return to_InlineKlass()->first_field_offset();)
54 }
55
56 // Returns the index of the field with the given offset. If the field at 'offset'
57 // belongs to a flat field, return the index of the field in the inline type of the flat field.
58 int ciInlineKlass::field_index_by_offset(int offset) {
59 assert(contains_field_offset(offset), "invalid field offset");
60 int best_offset = 0;
61 int best_index = -1;
62 // Search the field with the given offset
63 for (int i = 0; i < nof_declared_nonstatic_fields(); ++i) {
64 int field_offset = _declared_nonstatic_fields->at(i)->offset_in_bytes();
65 if (field_offset == offset) {
66 // Exact match
67 return i;
68 } else if (field_offset < offset && field_offset > best_offset) {
69 // No exact match. Save the index of the field with the closest offset that
70 // is smaller than the given field offset. This index corresponds to the
71 // flat field that holds the field we are looking for.
72 best_offset = field_offset;
73 best_index = i;
74 }
75 }
76 assert(best_index >= 0, "field not found");
77 assert(best_offset == offset || _declared_nonstatic_fields->at(best_index)->type()->is_inlinetype(), "offset should match for non-inline types");
78 return best_index;
79 }
80
81 // Are arrays containing this inline type flat arrays?
82 bool ciInlineKlass::flat_in_array() const {
83 GUARDED_VM_ENTRY(return to_InlineKlass()->flat_array();)
84 }
85
86 // Can this inline type be passed as multiple values?
87 bool ciInlineKlass::can_be_passed_as_fields() const {
88 GUARDED_VM_ENTRY(return to_InlineKlass()->can_be_passed_as_fields();)
89 }
90
91 // Can this inline type be returned as multiple values?
92 bool ciInlineKlass::can_be_returned_as_fields() const {
93 GUARDED_VM_ENTRY(return to_InlineKlass()->can_be_returned_as_fields();)
94 }
95
96 bool ciInlineKlass::is_empty() {
97 // Do not use InlineKlass::is_empty_inline_type here because it does
98 // consider the container empty even if fields of empty inline types
99 // are not flat
100 return nof_nonstatic_fields() == 0;
101 }
102
103 // When passing an inline type's fields as arguments, count the number
104 // of argument slots that are needed
105 int ciInlineKlass::inline_arg_slots() {
106 int slots = 0;
107 for (int j = 0; j < nof_nonstatic_fields(); j++) {
108 ciField* field = nonstatic_field_at(j);
109 slots += type2size[field->type()->basic_type()];
110 }
111 return slots;
112 }
113
114 ciInstance* ciInlineKlass::default_instance() const {
115 GUARDED_VM_ENTRY(
116 oop default_value = to_InlineKlass()->default_value();
117 return CURRENT_ENV->get_instance(default_value);
118 )
119 }
120
121 bool ciInlineKlass::contains_oops() const {
122 GUARDED_VM_ENTRY(return get_InlineKlass()->contains_oops();)
123 }
124
125 int ciInlineKlass::oop_count() const {
126 GUARDED_VM_ENTRY(return get_InlineKlass()->nonstatic_oop_count();)
127 }
128
129 address ciInlineKlass::pack_handler() const {
130 GUARDED_VM_ENTRY(return get_InlineKlass()->pack_handler();)
131 }
132
133 address ciInlineKlass::unpack_handler() const {
134 GUARDED_VM_ENTRY(return get_InlineKlass()->unpack_handler();)
135 }
136
137 InlineKlass* ciInlineKlass::get_InlineKlass() const {
138 GUARDED_VM_ENTRY(return to_InlineKlass();)
139 }
140