1 /*
2 * Copyright (c) 2014, 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 8051344
27 * @summary Force OSR compilation with non-empty stack at the OSR entry point.
28 * @modules java.base/jdk.internal.org.objectweb.asm
29 * @run main/othervm -XX:CompileCommand=compileonly,TestCase::test
30 * compiler.osr.TestOSRWithNonEmptyStack
31 */
32
33 package compiler.osr;
34
35 import jdk.internal.org.objectweb.asm.ClassWriter;
36 import jdk.internal.org.objectweb.asm.Label;
37 import jdk.internal.org.objectweb.asm.MethodVisitor;
38
39 import java.lang.reflect.Constructor;
40 import java.lang.reflect.Method;
41
42 import static jdk.internal.org.objectweb.asm.Opcodes.ACC_PUBLIC;
43 import static jdk.internal.org.objectweb.asm.Opcodes.ALOAD;
44 import static jdk.internal.org.objectweb.asm.Opcodes.DUP;
45 import static jdk.internal.org.objectweb.asm.Opcodes.IADD;
46 import static jdk.internal.org.objectweb.asm.Opcodes.ICONST_0;
47 import static jdk.internal.org.objectweb.asm.Opcodes.ICONST_1;
48 import static jdk.internal.org.objectweb.asm.Opcodes.IF_ICMPLT;
49 import static jdk.internal.org.objectweb.asm.Opcodes.ILOAD;
50 import static jdk.internal.org.objectweb.asm.Opcodes.INVOKESPECIAL;
51 import static jdk.internal.org.objectweb.asm.Opcodes.ISTORE;
52 import static jdk.internal.org.objectweb.asm.Opcodes.POP;
53 import static jdk.internal.org.objectweb.asm.Opcodes.RETURN;
54
55 public class TestOSRWithNonEmptyStack extends ClassLoader {
56 private static final int CLASS_FILE_VERSION = 52;
57 private static final String CLASS_NAME = "TestCase";
58 private static final String METHOD_NAME = "test";
59 private static final int ITERATIONS = 1_000_000;
60
61 private static byte[] generateTestClass() {
62 ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
63
64 cw.visit(TestOSRWithNonEmptyStack.CLASS_FILE_VERSION, ACC_PUBLIC,
65 TestOSRWithNonEmptyStack.CLASS_NAME, null, "java/lang/Object",
66 null);
67
68 TestOSRWithNonEmptyStack.generateConstructor(cw);
69 TestOSRWithNonEmptyStack.generateTestMethod(cw);
70
71 cw.visitEnd();
72 return cw.toByteArray();
73 }
74
75 private static void generateConstructor(ClassWriter classWriter) {
76 MethodVisitor mv = classWriter.visitMethod(ACC_PUBLIC, "<init>", "()V",
77 null, null);
78
79 mv.visitCode();
80
81 mv.visitVarInsn(ALOAD, 0);
82 mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V",
83 false);
84 mv.visitInsn(RETURN);
85
86 mv.visitMaxs(0, 0);
87 mv.visitEnd();
88 }
89
90 private static void generateTestMethod(ClassWriter classWriter) {
91 MethodVisitor mv = classWriter.visitMethod(ACC_PUBLIC,
92 TestOSRWithNonEmptyStack.METHOD_NAME, "()V", null, null);
93 Label osrEntryPoint = new Label();
94
95 mv.visitCode();
96 // Push 'this' into stack before OSR entry point to bail out compilation
97 mv.visitVarInsn(ALOAD, 0);
98 // Setup loop counter
99 mv.visitInsn(ICONST_0);
100 mv.visitVarInsn(ISTORE, 1);
101 // Begin loop
102 mv.visitLabel(osrEntryPoint);
103 // Increment loop counter
104 mv.visitVarInsn(ILOAD, 1);
105 mv.visitInsn(ICONST_1);
106 mv.visitInsn(IADD);
107 // Duplicate it for loop condition check
108 mv.visitInsn(DUP);
109 mv.visitVarInsn(ISTORE, 1);
110 // Check loop condition
111 mv.visitLdcInsn(TestOSRWithNonEmptyStack.ITERATIONS);
112 mv.visitJumpInsn(IF_ICMPLT, osrEntryPoint);
113 // Pop 'this'.
114 mv.visitInsn(POP);
115 mv.visitInsn(RETURN);
116
117 mv.visitMaxs(0, 0);
118 mv.visitEnd();
119 }
120
121 private void run() {
122 byte[] bytecode = TestOSRWithNonEmptyStack.generateTestClass();
123
124 try {
125 Class klass = defineClass(TestOSRWithNonEmptyStack.CLASS_NAME,
126 bytecode, 0, bytecode.length);
127
128 Constructor ctor = klass.getConstructor();
129 Method method = klass.getDeclaredMethod(
130 TestOSRWithNonEmptyStack.METHOD_NAME);
131
132 Object testCase = ctor.newInstance();
133 method.invoke(testCase);
134 } catch (Exception e) {
135 throw new RuntimeException(
136 "Test bug: generated class should be valid.", e);
137 }
138 }
139
140 public static void main(String args[]) {
141 new TestOSRWithNonEmptyStack().run();
142 }
143 }