1 /*
  2  * Copyright (c) 2021, 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 8262912
 27  * @library / /test/lib
 28  * @summary Test class resolution based on whitelist created by ciInstanceKlass entries in replay file.
 29  * @requires vm.flightRecorder != true & vm.compMode != "Xint" & vm.debug == true & vm.compiler2.enabled
 30  * @modules java.base/jdk.internal.misc
 31  * @build jdk.test.whitebox.WhiteBox
 32  * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
 33  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
 34  *      compiler.ciReplay.TestUnresolvedClasses
 35  */
 36 
 37 package compiler.ciReplay;
 38 
 39 import jdk.test.lib.Asserts;
 40 
 41 import java.io.IOException;
 42 import java.nio.file.Files;
 43 import java.nio.file.Paths;
 44 import java.nio.file.Path;
 45 import java.nio.file.StandardOpenOption;
 46 import java.util.ArrayList;
 47 import java.util.List;
 48 
 49 public class TestUnresolvedClasses extends CiReplayBase {
 50     private static final String LOG_FILE = "hotspot.log";
 51     private static final String[] COMMAND_LINE = new String[] {"-XX:LogFile='" + LOG_FILE + "'", "-XX:+LogCompilation", "-XX:+PrintIdeal",
 52                                                                "-XX:CompileCommand=dontinline,compiler.ciReplay.Test::dontInline"};
 53     public static void main(String[] args) {
 54         new TestUnresolvedClasses().runTest(false, TIERED_DISABLED_VM_OPTION);
 55     }
 56 
 57     @Override
 58     public String getTestClass() {
 59         return Test.class.getName();
 60     }
 61 
 62     @Override
 63     public void testAction() {
 64         positiveTest(COMMAND_LINE);




 65         // Should find CallStaticJava node for dontInline() as f.bar() is resolved and parsing completes.
 66         checkLogFile(true);
 67 

 68         // Remove ciInstanceKlass entry for Foo in replay file.
 69         try {
 70             Path replayFilePath = Paths.get(REPLAY_FILE_NAME);
 71             List<String> replayContent = Files.readAllLines(replayFilePath);
 72             List<String> newReplayContent = new ArrayList<>();
 73             boolean foundFoo = false;
 74             for (String line : replayContent) {
 75                 if (!line.startsWith("ciInstanceKlass compiler/ciReplay/Foo")) {
 76                     newReplayContent.add(line);
 77                 } else {
 78                     foundFoo = true;
 79                 }
 80             }
 81             Asserts.assertTrue(foundFoo, "Did not find ciInstanceKlass compiler/ciReplay/Foo entry");
 82             Files.write(replayFilePath, newReplayContent, StandardOpenOption.TRUNCATE_EXISTING);
 83         } catch (IOException ioe) {
 84             throw new Error("Failed to read/write replay data: " + ioe, ioe);
 85         }
 86 
 87         positiveTest(COMMAND_LINE);

 88         // No ciInstanceKlass entry for Foo is found in the replay. Replay compilation simulates that Foo is unresolved.
 89         // Therefore, C2 cannot resolve f.bar() at parsing time. It emits an UCT to resolve Foo and stops parsing.
 90         // The call to dontInline() will not be parsed and thus we should not find a CallStaticJava node for it.
 91         checkLogFile(false);
 92         remove(LOG_FILE);
 93     }
 94 
 95     // Parse <ideal> entry in hotspot.log file and try to find the call for dontInline().
 96     private void checkLogFile(boolean shouldMatch) {
 97         String toMatch = "Test::dontInline";
 98         try (var br = Files.newBufferedReader(Paths.get(LOG_FILE))) {
 99             String line;
100             boolean printIdealLine = false;
101             while ((line = br.readLine()) != null) {
102                 if (printIdealLine) {
103                     if (line.startsWith("</ideal")) {
104                         break;
105                     }
106                     if (line.contains(toMatch)) {
107                         Asserts.assertTrue(line.contains("CallStaticJava"), "must be CallStaticJava node");
108                         Asserts.assertTrue(shouldMatch, "Should not have found " + toMatch);
109                         return;
110                     }
111                 } else {
112                     printIdealLine = line.startsWith("<ideal");
113                 }
114             }
115         } catch (IOException e) {
116             throw new Error("Failed to read " + LOG_FILE + " data: " + e, e);
117         }
118         Asserts.assertFalse(shouldMatch, "Should have found " + toMatch);
119     }
120 }
121 
122 class Test {
123     static Foo f = new Foo();
124 
125     public static void main(String[] args) {
126         for (int i = 0; i < 10000; i++) {
127             test();

128         }
129     }
130 
131     public static void test() {
132         f.bar();
133         // At replay compilation: Should emit UCT for f.bar() because class Foo is unloaded. Parsing stops here.
134         // dontInline() is not parsed anymore.
135         dontInline();
136     }
137 
138     // Not inlined
139     public static void dontInline() {

140     }
141 }
142 
143 class Foo {
144     public int bar() {
145         return 3;

146     }
147 }
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