/*

 * Copyright 2015 SAP AG.  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 8141551

 * @summary C2 can not handle returns with inccompatible interface arrays

 * @modules java.base/jdk.internal.org.objectweb.asm

 *          java.base/sun.misc

 * @library /testlibrary /../../test/lib

 * @build sun.hotspot.WhiteBox

 * @run main ClassFileInstaller sun.hotspot.WhiteBox

 *                              sun.hotspot.WhiteBox$WhiteBoxPermission

 * @run main/othervm

 *        -Xbootclasspath/a:.

 *        -XX:+UnlockDiagnosticVMOptions

 *        -XX:+WhiteBoxAPI

 *        -Xbatch

 *        -XX:CompileThreshold=1

 *        -XX:-TieredCompilation

 *        -XX:CICompilerCount=1

 *        -XX:+PrintCompilation

 *        -XX:+PrintInlining

 *        -XX:CompileCommand=compileonly,MeetIncompatibleInterfaceArrays*.run

 *        -XX:CompileCommand=dontinline,TestMeetIncompatibleInterfaceArrays$Helper.createI2*

 *        -XX:CompileCommand=quiet

 *        TestMeetIncompatibleInterfaceArrays 0

 * @run main/othervm

 *        -Xbootclasspath/a:.

 *        -XX:+UnlockDiagnosticVMOptions

 *        -XX:+WhiteBoxAPI

 *        -Xbatch

 *        -XX:CompileThreshold=1

 *        -XX:-TieredCompilation

 *        -XX:CICompilerCount=1

 *        -XX:+PrintCompilation

 *        -XX:+PrintInlining

 *        -XX:CompileCommand=compileonly,MeetIncompatibleInterfaceArrays*.run

 *        -XX:CompileCommand=inline,TestMeetIncompatibleInterfaceArrays$Helper.createI2*

 *        -XX:CompileCommand=quiet

 *        TestMeetIncompatibleInterfaceArrays 1

 * @run main/othervm

 *        -Xbootclasspath/a:.

 *        -XX:+UnlockDiagnosticVMOptions

 *        -XX:+WhiteBoxAPI

 *        -Xbatch

 *        -XX:CompileThreshold=1

 *        -XX:Tier0InvokeNotifyFreqLog=0 -XX:Tier2InvokeNotifyFreqLog=0 -XX:Tier3InvokeNotifyFreqLog=0 -XX:Tier23InlineeNotifyFreqLog=0

 *        -XX:Tier3InvocationThreshold=2 -XX:Tier3MinInvocationThreshold=2 -XX:Tier3CompileThreshold=2

 *        -XX:Tier4InvocationThreshold=1 -XX:Tier4MinInvocationThreshold=1 -XX:Tier4CompileThreshold=1

 *        -XX:+TieredCompilation

 *        -XX:CICompilerCount=2

 *        -XX:+PrintCompilation

 *        -XX:+PrintInlining

 *        -XX:CompileCommand=compileonly,MeetIncompatibleInterfaceArrays*.run

 *        -XX:CompileCommand=compileonly,TestMeetIncompatibleInterfaceArrays$Helper.createI2*

 *        -XX:CompileCommand=inline,TestMeetIncompatibleInterfaceArrays$Helper.createI2*

 *        -XX:CompileCommand=quiet

 *        TestMeetIncompatibleInterfaceArrays 2

 *

 * @author volker.simonis@gmail.com

 */

import java.io.FileOutputStream;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

import jdk.internal.org.objectweb.asm.ClassWriter;

import jdk.internal.org.objectweb.asm.MethodVisitor;

import static jdk.internal.org.objectweb.asm.Opcodes.*;

import sun.hotspot.WhiteBox;

public class TestMeetIncompatibleInterfaceArrays extends ClassLoader {

    private static final WhiteBox WB = WhiteBox.getWhiteBox();

    public static interface I1 { public String getName(); }

    public static interface I2 { public String getName(); }

    public static class I2C implements I2 { public String getName() { return "I2";} }

    public static class I21C implements I2, I1 { public String getName() { return "I2 and I1";} }

    public static class Helper {

        public static I2 createI2Array0() {

            return new I2C();

        }

        public static I2[] createI2Array1() {

            return new I2C[] { new I2C() };

        }

        public static I2[][] createI2Array2() {

            return new I2C[][] { new I2C[] { new I2C() } };

        }

        public static I2[][][] createI2Array3() {

            return new I2C[][][] { new I2C[][] { new I2C[] { new I2C() } } };

        }

        public static I2[][][][] createI2Array4() {

            return new I2C[][][][] { new I2C[][][] { new I2C[][] { new I2C[] { new I2C() } } } };

        }

        public static I2[][][][][] createI2Array5() {

            return new I2C[][][][][] { new I2C[][][][] { new I2C[][][] { new I2C[][] { new I2C[] { new I2C() } } } } };

        }

        public static I2 createI21Array0() {

            return new I21C();

        }

        public static I2[] createI21Array1() {

            return new I21C[] { new I21C() };

        }

        public static I2[][] createI21Array2() {

            return new I21C[][] { new I21C[] { new I21C() } };

        }

        public static I2[][][] createI21Array3() {

            return new I21C[][][] { new I21C[][] { new I21C[] { new I21C() } } };

        }

        public static I2[][][][] createI21Array4() {

            return new I21C[][][][] { new I21C[][][] { new I21C[][] { new I21C[] { new I21C() } } } };

        }

        public static I2[][][][][] createI21Array5() {

            return new I21C[][][][][] { new I21C[][][][] { new I21C[][][] { new I21C[][] { new I21C[] { new I21C() } } } } };

        }

    }

    // Location for the generated class files

    public static final String PATH = System.getProperty("test.classes", ".") + java.io.File.separator;

    /*

     * With 'good == false' this helper method creates the following classes

     * (using the nested 'Helper' class and the nested interfaces 'I1' and 'I2').

     * For brevity I omit the enclosing class 'TestMeetIncompatibleInterfaceArrays' in the

     * following examples:

     *

     * public class MeetIncompatibleInterfaceArrays0ASM {

     *   public static I1 run() {

     *     return Helper.createI2Array0(); // returns I2

     *   }

     *   public static void test() {

     *     I1 i1 = run();

     *     System.out.println(i1.getName());

     *   }

     * }

     * public class MeetIncompatibleInterfaceArrays1ASM {

     *   public static I1[] run() {

     *     return Helper.createI2Array1(); // returns I2[]

     *   }

     *   public static void test() {

     *     I1[] i1 = run();

     *     System.out.println(i1[0].getName());

     *   }

     * }

     * ...

     * // MeetIncompatibleInterfaceArrays4ASM is special because it creates

     * // an illegal class which will be rejected by the verifier.

     * public class MeetIncompatibleInterfaceArrays4ASM {

     *   public static I1[][][][] run() {

     *     return Helper.createI2Array3(); // returns I1[][][] which gives a verifier error because return expects I1[][][][]

     *   }

     *   public static void test() {

     *     I1[][][][][] i1 = run();

     *     System.out.println(i1[0][0][0][0][0].getName());

     *   }

     * ...

     * public class MeetIncompatibleInterfaceArrays5ASM {

     *   public static I1[][][][][] run() {

     *     return Helper.createI2Array5(); // returns I2[][][][][]

     *   }

     *   public static void test() {

     *     I1[][][][][] i1 = run();

     *     System.out.println(i1[0][0][0][0][0].getName());

     *   }

     * }

     *

     * Notice that this is not legal Java code. We would have to use a cast in "run()" to make it legal:

     *

     *   public static I1[] run() {

     *     return (I1[])Helper.createI2Array1(); // returns I2[]

     *   }

     *

     * But in pure bytecode, the "run()" methods are perfectly legal:

     *

     *   public static I1[] run();

     *     Code:

     *       0: invokestatic  #16  // Method Helper.createI2Array1:()[LI2;

     *       3: areturn

     *

     * The "test()" method calls the "getName()" function from I1 on the objects returned by "run()".

     * This will epectedly fail with an "IncompatibleClassChangeError" because the objects returned

     * by "run()" (and by createI2Array()) are actually of type "I2C" and only implement "I2" but not "I1".

     *

     *

     * With 'good == true' this helper method will create the following classes:

     *

     * public class MeetIncompatibleInterfaceArraysGood0ASM {

     *   public static I1 run() {

     *     return Helper.createI21Array0(); // returns I2

     *   }

     *   public static void test() {

     *     I1 i1 = run();

     *     System.out.println(i1.getName());

     *   }

     * }

     *

     * Calling "test()" on these objects will succeed and output "I2 and I1" because now the "run()"

     * method calls "createI21Array()" which actually return an object (or an array of objects) of

     * type "I21C" which implements both "I2" and "I1".

     *

     * Notice that at the bytecode level, the code for the "run()" and "test()" methods in

     * "MeetIncompatibleInterfaceArraysASM" and "MeetIncompatibleInterfaceArraysGoodASM" look exactly

     * the same. I.e. the verifier has no chance to verify if the I2 object returned by "createI1Array()"

     * or "createI21Array()" implements "I1" or not. That's actually the reason why both versions of

     * generated classes are legal from a verifier point of view.

     *

     */

    static void generateTestClass(int dim, boolean good) throws Exception {

        String baseClassName = "MeetIncompatibleInterfaceArrays";

        if (good)

            baseClassName += "Good";

        String createName = "createI2" + (good ? "1" : "") + "Array";

        String a = "";

        for (int i = 0; i < dim; i++)

            a += "[";

        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);

        cw.visit(V1_8, ACC_PUBLIC, baseClassName + dim + "ASM", null, "java/lang/Object", null);

        MethodVisitor constr = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);

        constr.visitCode();

        constr.visitVarInsn(ALOAD, 0);

        constr.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);

        constr.visitInsn(RETURN);

        constr.visitMaxs(0, 0);

        constr.visitEnd();

        MethodVisitor run = cw.visitMethod(ACC_PUBLIC | ACC_STATIC, "run",

                "()" + a + "LTestMeetIncompatibleInterfaceArrays$I1;", null, null);

        run.visitCode();

        if (dim == 4) {

            run.visitMethodInsn(INVOKESTATIC, "TestMeetIncompatibleInterfaceArrays$Helper", createName + 3,

                    "()" + "[[[" + "LTestMeetIncompatibleInterfaceArrays$I2;", false);

        } else {

            run.visitMethodInsn(INVOKESTATIC, "TestMeetIncompatibleInterfaceArrays$Helper", createName + dim,

                    "()" + a + "LTestMeetIncompatibleInterfaceArrays$I2;", false);

        }

        run.visitInsn(ARETURN);

        run.visitMaxs(0, 0);

        run.visitEnd();

        MethodVisitor test = cw.visitMethod(ACC_PUBLIC | ACC_STATIC, "test", "()V", null, null);

        test.visitCode();

        test.visitMethodInsn(INVOKESTATIC, baseClassName + dim + "ASM", "run",

                "()" + a + "LTestMeetIncompatibleInterfaceArrays$I1;", false);

        test.visitVarInsn(ASTORE, 0);

        if (dim > 0) {

            test.visitVarInsn(ALOAD, 0);

            for (int i = 1; i <= dim; i++) {

                test.visitInsn(ICONST_0);

                test.visitInsn(AALOAD);

            }

            test.visitVarInsn(ASTORE, 1);

        }

        test.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");

        test.visitVarInsn(ALOAD, dim > 0 ? 1 : 0);

        test.visitMethodInsn(INVOKEINTERFACE, "TestMeetIncompatibleInterfaceArrays$I1", "getName",

                "()Ljava/lang/String;", true);

        test.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/Object;)V", false);

        test.visitInsn(RETURN);

        test.visitMaxs(0, 0);

        test.visitEnd();

        // Get the bytes of the class..

        byte[] b = cw.toByteArray();

        // ..and write them into a class file (for debugging)

        FileOutputStream fos = new FileOutputStream(PATH + baseClassName + dim + "ASM.class");

        fos.write(b);

        fos.close();

    }

    public static String[][] tier = { { "interpreted", "C2 (tier 4) without inlining", "C2 (tier4) without inlining" },

            { "interpreted", "C2 (tier 4) with inlining", "C2 (tier4) with inlining" },

            { "interpreted", "C1 (tier 3) with inlining", "C2 (tier4) with inlining" } };

    public static void main(String[] args) throws Exception {

        final int pass = Integer.parseInt(args.length > 0 ? args[0] : "0");

        // Load and initialize some classes required for compilation

        Class.forName("TestMeetIncompatibleInterfaceArrays$I1");

        Class.forName("TestMeetIncompatibleInterfaceArrays$I2");

        Class.forName("TestMeetIncompatibleInterfaceArrays$Helper");

        for (int g = 0; g < 2; g++) {

            String baseClassName = "MeetIncompatibleInterfaceArrays";

            boolean good = (g == 0) ? false : true;

            if (good)

                baseClassName += "Good";

            for (int i = 0; i < 6; i++) {

                System.out.println();

                System.out.println("Creating " + baseClassName + i + "ASM.class");

                System.out.println("========================================" + "=" + "=========");

                // Create the "MeetIncompatibleInterfaceArrays<i>ASM" class

                generateTestClass(i, good);

                Class<?> c = null;

                try {

                    c = Class.forName(baseClassName + i + "ASM");

                } catch (VerifyError ve) {

                    if (i == 4) {

                        System.out.println("OK - must be (" + ve.getMessage() + ").");

                    } else {

                        throw ve;

                    }

                    continue;

                }

                // Call MeetIncompatibleInterfaceArrays<i>ASM.test()

                Method m = c.getMethod("test");

                Method r = c.getMethod("run");

                for (int j = 0; j < 3; j++) {

                    System.out.println((j + 1) + ". invokation of " + baseClassName + i + "ASM.test() [should be "

                            + tier[pass][j] + "]");

                    try {

                        m.invoke(null);

                    } catch (InvocationTargetException ite) {

                        if (good) {

                            throw ite;

                        } else {

                            if (ite.getCause() instanceof IncompatibleClassChangeError) {

                                System.out.println("  OK - catched InvocationTargetException("

                                        + ite.getCause().getMessage() + ").");

                            } else {

                                throw ite;

                            }

                        }

                    }

                }

                System.out.println("Method " + r + (WB.isMethodCompiled(r) ? " has" : " has not") + " been compiled.");

                if (!WB.isMethodCompiled(r)) {

                    throw new Exception("Method " + r + " must be compiled!");

                }

            }

        }

    }

}