1 /*
2 * Copyright (c) 2016, 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 #include "precompiled.hpp"
25 #include "gc/z/zAddress.inline.hpp"
26 #include "gc/z/zForwarding.inline.hpp"
27 #include "gc/z/zGlobals.hpp"
28 #include "gc/z/zPage.inline.hpp"
29 #include "unittest.hpp"
30
31 using namespace testing;
32
33 #define CAPTURE_DELIM "\n"
34 #define CAPTURE1(expression) #expression << " evaluates to " << expression
35 #define CAPTURE2(e0, e1) CAPTURE1(e0) << CAPTURE_DELIM << CAPTURE1(e1)
36
37 #define CAPTURE(expression) CAPTURE1(expression)
38
39 class ZForwardingTest : public Test {
40 public:
41 // Helper functions
42
43 static bool is_power_of_2(size_t value) {
44 return ::is_power_of_2((intptr_t)value);
45 }
46
47 class SequenceToFromIndex : AllStatic {
48 public:
49 static uintptr_t even(size_t sequence_number) {
50 return sequence_number * 2;
51 }
52 static uintptr_t odd(size_t sequence_number) {
53 return even(sequence_number) + 1;
54 }
55 static uintptr_t one_to_one(size_t sequence_number) {
56 return sequence_number;
57 }
58 };
59
60 // Test functions
61
62 static void setup(ZForwarding* forwarding) {
63 EXPECT_PRED1(is_power_of_2, forwarding->_entries.length()) << CAPTURE(forwarding->_entries.length());
64 }
65
66 static void find_empty(ZForwarding* forwarding) {
67 size_t size = forwarding->_entries.length();
68 size_t entries_to_check = size * 2;
69
70 for (size_t i = 0; i < entries_to_check; i++) {
71 uintptr_t from_index = SequenceToFromIndex::one_to_one(i);
72
73 EXPECT_FALSE(forwarding->find(from_index).populated()) << CAPTURE2(from_index, size);
74 }
75 }
76
77 static void find_full(ZForwarding* forwarding) {
78 size_t size = forwarding->_entries.length();
79 size_t entries_to_populate = size;
80
81 // Populate
82 for (size_t i = 0; i < entries_to_populate; i++) {
83 uintptr_t from_index = SequenceToFromIndex::one_to_one(i);
84
85 ZForwardingCursor cursor;
86 ZForwardingEntry entry = forwarding->find(from_index, &cursor);
87 ASSERT_FALSE(entry.populated()) << CAPTURE2(from_index, size);
88
89 forwarding->insert(from_index, from_index, &cursor);
90 }
91
92 // Verify
93 for (size_t i = 0; i < entries_to_populate; i++) {
94 uintptr_t from_index = SequenceToFromIndex::one_to_one(i);
95
96 ZForwardingEntry entry = forwarding->find(from_index);
97 ASSERT_TRUE(entry.populated()) << CAPTURE2(from_index, size);
98
99 ASSERT_EQ(entry.from_index(), from_index) << CAPTURE(size);
100 ASSERT_EQ(entry.to_offset(), from_index) << CAPTURE(size);
101 }
102 }
103
104 static void find_every_other(ZForwarding* forwarding) {
105 size_t size = forwarding->_entries.length();
106 size_t entries_to_populate = size / 2;
107
108 // Populate even from indices
109 for (size_t i = 0; i < entries_to_populate; i++) {
110 uintptr_t from_index = SequenceToFromIndex::even(i);
111
112 ZForwardingCursor cursor;
113 ZForwardingEntry entry = forwarding->find(from_index, &cursor);
114 ASSERT_FALSE(entry.populated()) << CAPTURE2(from_index, size);
115
116 forwarding->insert(from_index, from_index, &cursor);
117 }
118
119 // Verify populated even indices
120 for (size_t i = 0; i < entries_to_populate; i++) {
121 uintptr_t from_index = SequenceToFromIndex::even(i);
122
123 ZForwardingCursor cursor;
124 ZForwardingEntry entry = forwarding->find(from_index, &cursor);
125 ASSERT_TRUE(entry.populated()) << CAPTURE2(from_index, size);
126
127 ASSERT_EQ(entry.from_index(), from_index) << CAPTURE(size);
128 ASSERT_EQ(entry.to_offset(), from_index) << CAPTURE(size);
129 }
130
131 // Verify empty odd indices
132 //
133 // This check could be done on a larger range of sequence numbers,
134 // but currently entries_to_populate is used.
135 for (size_t i = 0; i < entries_to_populate; i++) {
136 uintptr_t from_index = SequenceToFromIndex::odd(i);
137
138 ZForwardingEntry entry = forwarding->find(from_index);
139
140 ASSERT_FALSE(entry.populated()) << CAPTURE2(from_index, size);
141 }
142 }
143
144 static void test(void (*function)(ZForwarding*), uint32_t size) {
145 // Create page
146 const ZVirtualMemory vmem(0, ZPageSizeSmall);
147 const ZPhysicalMemory pmem(ZPhysicalMemorySegment(0, ZPageSizeSmall));
148 ZPage page(ZPageTypeSmall, vmem, pmem);
149
150 page.reset();
151
152 const size_t object_size = 16;
153 const uintptr_t object = page.alloc_object(object_size);
154
155 ZGlobalSeqNum++;
156
157 bool dummy = false;
158 page.mark_object(ZAddress::marked(object), dummy, dummy);
159
160 const uint32_t live_objects = size;
161 const size_t live_bytes = live_objects * object_size;
162 page.inc_live(live_objects, live_bytes);
163
164 // Setup forwarding
165 ZForwarding* const forwarding = ZForwarding::create(&page);
166
167 // Actual test function
168 (*function)(forwarding);
169
170 // Teardown forwarding
171 ZForwarding::destroy(forwarding);
172 }
173
174 // Run the given function with a few different input values.
175 static void test(void (*function)(ZForwarding*)) {
176 test(function, 1);
177 test(function, 2);
178 test(function, 3);
179 test(function, 4);
180 test(function, 7);
181 test(function, 8);
182 test(function, 1023);
183 test(function, 1024);
184 test(function, 1025);
185 }
186 };
187
188 TEST_F(ZForwardingTest, setup) {
189 test(&ZForwardingTest::setup);
190 }
191
192 TEST_F(ZForwardingTest, find_empty) {
193 test(&ZForwardingTest::find_empty);
194 }
195
196 TEST_F(ZForwardingTest, find_full) {
197 test(&ZForwardingTest::find_full);
198 }
199
200 TEST_F(ZForwardingTest, find_every_other) {
201 test(&ZForwardingTest::find_every_other);
202 }