| /* |
| * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| import java.lang.reflect.Constructor; |
| import java.lang.reflect.Method; |
| |
| import jdk.internal.org.objectweb.asm.ClassWriter; |
| import jdk.internal.org.objectweb.asm.Label; |
| import jdk.internal.org.objectweb.asm.MethodVisitor; |
| import static jdk.internal.org.objectweb.asm.Opcodes.*; |
| |
| /** |
| * @test |
| * @bug 8051344 |
| * @summary Force OSR compilation with non-empty stack at the OSR entry point. |
| * @compile -XDignore.symbol.file TestOSRWithNonEmptyStack.java |
| * @run main/othervm -XX:CompileOnly=TestCase.test TestOSRWithNonEmptyStack |
| */ |
| public class TestOSRWithNonEmptyStack extends ClassLoader { |
| private static final int CLASS_FILE_VERSION = 52; |
| private static final String CLASS_NAME = "TestCase"; |
| private static final String METHOD_NAME = "test"; |
| private static final int ITERATIONS = 1_000_000; |
| |
| private static byte[] generateTestClass() { |
| ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES); |
| |
| cw.visit(TestOSRWithNonEmptyStack.CLASS_FILE_VERSION, ACC_PUBLIC, |
| TestOSRWithNonEmptyStack.CLASS_NAME, null, "java/lang/Object", |
| null); |
| |
| TestOSRWithNonEmptyStack.generateConstructor(cw); |
| TestOSRWithNonEmptyStack.generateTestMethod(cw); |
| |
| cw.visitEnd(); |
| return cw.toByteArray(); |
| } |
| |
| private static void generateConstructor(ClassWriter classWriter) { |
| MethodVisitor mv = classWriter.visitMethod(ACC_PUBLIC, "<init>", "()V", |
| null, null); |
| |
| mv.visitCode(); |
| |
| mv.visitVarInsn(ALOAD, 0); |
| mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", |
| false); |
| mv.visitInsn(RETURN); |
| |
| mv.visitMaxs(0, 0); |
| mv.visitEnd(); |
| } |
| |
| private static void generateTestMethod(ClassWriter classWriter) { |
| MethodVisitor mv = classWriter.visitMethod(ACC_PUBLIC, |
| TestOSRWithNonEmptyStack.METHOD_NAME, "()V", null, null); |
| Label osrEntryPoint = new Label(); |
| |
| mv.visitCode(); |
| // Push 'this' into stack before OSR entry point to bail out compilation |
| mv.visitVarInsn(ALOAD, 0); |
| // Setup loop counter |
| mv.visitInsn(ICONST_0); |
| mv.visitVarInsn(ISTORE, 1); |
| // Begin loop |
| mv.visitLabel(osrEntryPoint); |
| // Increment loop counter |
| mv.visitVarInsn(ILOAD, 1); |
| mv.visitInsn(ICONST_1); |
| mv.visitInsn(IADD); |
| // Duplicate it for loop condition check |
| mv.visitInsn(DUP); |
| mv.visitVarInsn(ISTORE, 1); |
| // Check loop condition |
| mv.visitLdcInsn(TestOSRWithNonEmptyStack.ITERATIONS); |
| mv.visitJumpInsn(IF_ICMPLT, osrEntryPoint); |
| // Pop 'this'. |
| mv.visitInsn(POP); |
| mv.visitInsn(RETURN); |
| |
| mv.visitMaxs(0, 0); |
| mv.visitEnd(); |
| } |
| |
| private void run() { |
| byte[] bytecode = TestOSRWithNonEmptyStack.generateTestClass(); |
| |
| try { |
| Class klass = defineClass(TestOSRWithNonEmptyStack.CLASS_NAME, |
| bytecode, 0, bytecode.length); |
| |
| Constructor ctor = klass.getConstructor(); |
| Method method = klass.getDeclaredMethod( |
| TestOSRWithNonEmptyStack.METHOD_NAME); |
| |
| Object testCase = ctor.newInstance(); |
| method.invoke(testCase); |
| } catch (Exception e) { |
| throw new RuntimeException( |
| "Test bug: generated class should be valid.", e); |
| } |
| } |
| |
| public static void main(String args[]) { |
| new TestOSRWithNonEmptyStack().run(); |
| } |
| } |