1 /*
2 * Copyright (c) 2015, 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 * @test
26 * @bug 8076188
27 * @summary arraycopy to non escaping destination may be eliminated
28 * @library /
29 *
30 * @run main/othervm -ea -XX:-BackgroundCompilation -XX:-UseOnStackReplacement
31 * -XX:CompileCommand=dontinline,compiler.arraycopy.TestEliminateArrayCopy*::m*
32 * compiler.arraycopy.TestEliminateArrayCopy
33 *
34 */
35
36 package compiler.arraycopy;
37
38 public class TestEliminateArrayCopy {
39
40 static class CloneTests extends TestInstanceCloneUtils {
41 // object allocation and ArrayCopyNode should be eliminated
42 static void m1(E src) throws CloneNotSupportedException {
43 src.clone();
44 }
45
46 // both object allocations and ArrayCopyNode should be eliminated
47 static void m2(Object dummy) throws CloneNotSupportedException {
48 E src = new E(false);
49 src.clone();
50 }
51
52 // object allocation and ArrayCopyNode should be eliminated. Fields should be loaded from src.
53 static int m3(E src) throws CloneNotSupportedException {
54 E dest = (E)src.clone();
55 return dest.i1 + dest.i2 + dest.i3 + dest.i4 + dest.i5 +
56 dest.i6 + dest.i7 + dest.i8 + dest.i9;
57 }
58 }
59
60 static class ArrayCopyTests extends TestArrayCopyUtils {
61
62 // object allocation and ArrayCopyNode should be eliminated.
63 @Args(src=ArraySrc.LARGE)
64 static int m1() throws CloneNotSupportedException {
65 int[] array_clone = (int[])large_int_src.clone();
66 return array_clone[0] + array_clone[1] + array_clone[2] +
67 array_clone[3] + array_clone[4] + array_clone[5] +
68 array_clone[6] + array_clone[7] + array_clone[8] +
69 array_clone[9];
70 }
71
72 // object allocation and ArrayCopyNode should be eliminated.
73 @Args(src=ArraySrc.LARGE)
74 static int m2() {
75 int[] dest = new int[10];
76 System.arraycopy(large_int_src, 0, dest, 0, 10);
77 return dest[0] + dest[1] + dest[2] + dest[3] + dest[4] +
78 dest[5] + dest[6] + dest[7] + dest[8] + dest[9];
79 }
80
81 // object allocations and ArrayCopyNodes should be eliminated.
82 @Args(src=ArraySrc.LARGE)
83 static int m3() {
84 int[] dest1 = new int[10];
85 System.arraycopy(large_int_src, 0, dest1, 0, 10);
86
87 int[] dest2 = new int[10];
88 System.arraycopy(dest1, 0, dest2, 0, 10);
89
90 return dest2[0] + dest2[1] + dest2[2] + dest2[3] + dest2[4] +
91 dest2[5] + dest2[6] + dest2[7] + dest2[8] + dest2[9];
92 }
93
94 static class m4_class {
95 Object f;
96 }
97
98 static void m4_helper() {}
99
100 // allocations eliminated and arraycopy optimized out
101 @Args(src=ArraySrc.LARGE)
102 static int m4() {
103 int[] dest = new int[10];
104 m4_class o = new m4_class();
105 o.f = dest;
106 m4_helper();
107 System.arraycopy(large_int_src, 0, o.f, 0, 10);
108 return dest[0] + dest[1] + dest[2] + dest[3] + dest[4] +
109 dest[5] + dest[6] + dest[7] + dest[8] + dest[9];
110 }
111
112 static void m5_helper() {}
113
114 // Small copy cannot be converted to loads/stores because
115 // allocation is not close enough to arraycopy but arraycopy
116 // itself can be eliminated
117 @Args(src=ArraySrc.SMALL, dst=ArrayDst.NEW)
118 static void m5(A[] src, A[] dest) {
119 A[] temp = new A[5];
120 m5_helper();
121 System.arraycopy(src, 0, temp, 0, 5);
122 dest[0] = temp[0];
123 dest[1] = temp[1];
124 dest[2] = temp[2];
125 dest[3] = temp[3];
126 dest[4] = temp[4];
127 }
128
129 // object allocation and ArrayCopyNode should be eliminated.
130 @Args(src=ArraySrc.LARGE)
131 static int m6(int [] src) {
132 int res = src[0] + src[1] + src[2] + src[3] + src[4] +
133 src[5] + src[6] + src[7] + src[8] + src[9];
134
135 int[] dest = new int[10];
136
137 System.arraycopy(src, 0, dest, 0, 10);
138
139 res += dest[0] + dest[1] + dest[2] + dest[3] + dest[4] +
140 dest[5] + dest[6] + dest[7] + dest[8] + dest[9];
141 return res/2;
142 }
143
144 @Args(src=ArraySrc.LARGE)
145 static int m7() {
146 int[] dest = new int[10];
147 dest[0] = large_int_src[8];
148 dest[1] = large_int_src[9];
149 System.arraycopy(large_int_src, 0, dest, 2, 8);
150 return dest[0] + dest[1] + dest[2] + dest[3] + dest[4] +
151 dest[5] + dest[6] + dest[7] + dest[8] + dest[9];
152 }
153 }
154
155 // test that OptimizePtrCompare still works
156 static final Object[] m1_array = new Object[10];
157 static boolean m1_array_null_element = false;
158 static void m1(int i) {
159 Object[] array_clone = (Object[])m1_array.clone();
160 if (array_clone[i] == null) {
161 m1_array_null_element = true;
162 }
163 }
164
165 static public void main(String[] args) throws Exception {
166 CloneTests clone_tests = new CloneTests();
167
168 clone_tests.doTest(clone_tests.e, "m1");
169 clone_tests.doTest(null, "m2");
170 clone_tests.doTest(clone_tests.e, "m3");
171
172 ArrayCopyTests ac_tests = new ArrayCopyTests();
173
174 ac_tests.doTest("m1");
175 ac_tests.doTest("m2");
176 ac_tests.doTest("m3");
177 ac_tests.doTest("m4");
178 ac_tests.doTest("m5");
179 ac_tests.doTest("m6");
180 ac_tests.doTest("m7");
181
182 if (!clone_tests.success || !ac_tests.success) {
183 throw new RuntimeException("some tests failed");
184 }
185
186 // Make sure both branches of the if in m1() appear taken
187 for (int i = 0; i < 7000; i++) {
188 m1(0);
189 }
190 m1_array[0] = new Object();
191 for (int i = 0; i < 20000; i++) {
192 m1(0);
193 }
194 m1_array_null_element = false;
195 m1(0);
196 if (m1_array_null_element) {
197 throw new RuntimeException("OptimizePtrCompare test failed");
198 }
199 }
200 }