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/*
* Copyright (c) 2014, 2015, 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.
*/
/**
* @test
* @bug 8051344
* @summary Force OSR compilation with non-empty stack at the OSR entry point.
* @modules java.base/jdk.internal.org.objectweb.asm
* @run main/othervm -XX:CompileCommand=compileonly,TestCase::test
* compiler.osr.TestOSRWithNonEmptyStack
*/
package compiler.osr;
import jdk.internal.org.objectweb.asm.ClassWriter;
import jdk.internal.org.objectweb.asm.Label;
import jdk.internal.org.objectweb.asm.MethodVisitor;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import static jdk.internal.org.objectweb.asm.Opcodes.ACC_PUBLIC;
import static jdk.internal.org.objectweb.asm.Opcodes.ALOAD;
import static jdk.internal.org.objectweb.asm.Opcodes.DUP;
import static jdk.internal.org.objectweb.asm.Opcodes.IADD;
import static jdk.internal.org.objectweb.asm.Opcodes.ICONST_0;
import static jdk.internal.org.objectweb.asm.Opcodes.ICONST_1;
import static jdk.internal.org.objectweb.asm.Opcodes.IF_ICMPLT;
import static jdk.internal.org.objectweb.asm.Opcodes.ILOAD;
import static jdk.internal.org.objectweb.asm.Opcodes.INVOKESPECIAL;
import static jdk.internal.org.objectweb.asm.Opcodes.ISTORE;
import static jdk.internal.org.objectweb.asm.Opcodes.POP;
import static jdk.internal.org.objectweb.asm.Opcodes.RETURN;
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();
}
}
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