Package org.ow2.asm

Examples of org.ow2.asm.ClassWriter

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        });
    }

    static byte[] transformClass(final byte[] clazz) {
        ClassReader cr = new ClassReader(clazz);
        ClassWriter cw = new ClassWriter(0);
        cr.accept(new ClassAdapter(cw) {

            @Override
            public MethodVisitor visitMethod(
                final int access,
                final String name,
                final String desc,
                final String signature,
                final String[] exceptions)
            {
                return new LocalVariablesSorter(access,
                        desc,
                        cv.visitMethod(access,
                                name,
                                desc,
                                signature,
                                exceptions));
            }

        }, ClassReader.EXPAND_FRAMES);
        return cw.toByteArray();
    }
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    public void generate(final String dir) throws IOException {
        generate(dir, "pkg/Attribute.class", dump());
    }

    public byte[] dump() {
        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
        FieldVisitor fv;
        MethodVisitor mv;

        cw.visit(V1_3,
                ACC_PUBLIC + ACC_SYNTHETIC,
                "pkg/Attribute",
                null,
                "java/lang/Object",
                null);

        cw.visitAttribute(new Comment());

        fv = cw.visitField(ACC_PUBLIC, "f", "I", null, null);
        fv.visitAttribute(new Comment());
        fv.visitEnd();

        mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
        mv.visitAttribute(new Comment());
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");

        /*
         * the following instructions are designed so that this method will be
         * resized by the method resizing test, in order to cover the code that
         * recomputes the code attribute labels in the resizeInstructions method
         * (see MethodWriter).
         */
        Label l0 = new Label();
        mv.visitInsn(ICONST_0);
        mv.visitJumpInsn(IFEQ, l0);
        // many NOPs will be introduced here by the method resizing test
        mv.visitJumpInsn(GOTO, l0);
        mv.visitLabel(l0);

        mv.visitInsn(RETURN);
        mv.visitMaxs(0, 0);
        mv.visitAttribute(new CodeComment());
        mv.visitEnd();

        cw.visitEnd();
        return cw.toByteArray();
    }
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    public void generate(final String dir) throws IOException {
        generate(dir, "pkg/Enum.class", dump());
    }

    public byte[] dump() {
        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
        FieldVisitor fv;
        MethodVisitor mv;

        cw.visit(V1_5,
                ACC_PUBLIC + ACC_FINAL + ACC_SUPER + ACC_ENUM,
                "pkg/Enum",
                "Ljava/lang/Enum<Lpkg/Enum;>;",
                "java/lang/Enum",
                null);

        fv = cw.visitField(ACC_PUBLIC + ACC_FINAL + ACC_STATIC + ACC_ENUM,
                "V0",
                "Lpkg/Enum;",
                null,
                null);
        fv.visitEnd();

        fv = cw.visitField(ACC_PUBLIC + ACC_FINAL + ACC_STATIC + ACC_ENUM,
                "V1",
                "Lpkg/Enum;",
                null,
                null);
        fv.visitEnd();

        fv = cw.visitField(ACC_PUBLIC + ACC_FINAL + ACC_STATIC + ACC_ENUM,
                "V2",
                "Lpkg/Enum;",
                null,
                null);
        fv.visitEnd();

        fv = cw.visitField(ACC_PRIVATE + ACC_FINAL + ACC_STATIC + ACC_SYNTHETIC,
                "$VALUES",
                "[Lpkg/Enum;",
                null,
                null);
        fv.visitEnd();

        mv = cw.visitMethod(ACC_PUBLIC + ACC_FINAL + ACC_STATIC,
                "values",
                "()[Lpkg/Enum;",
                null,
                null);
        mv.visitCode();
        mv.visitFieldInsn(GETSTATIC, "pkg/Enum", "$VALUES", "[Lpkg/Enum;");
        mv.visitMethodInsn(INVOKEVIRTUAL,
                "[Lpkg/Enum;",
                "clone",
                "()Ljava/lang/Object;");
        mv.visitTypeInsn(CHECKCAST, "[Lpkg/Enum;");
        mv.visitInsn(ARETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();

        mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC,
                "valueOf",
                "(Ljava/lang/String;)Lpkg/Enum;",
                null,
                null);
        mv.visitCode();
        mv.visitLdcInsn(Type.getType("Lpkg/Enum;"));
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKESTATIC,
                "java/lang/Enum",
                "valueOf",
                "(Ljava/lang/Class;Ljava/lang/String;)Ljava/lang/Enum;");
        mv.visitTypeInsn(CHECKCAST, "pkg/Enum");
        mv.visitInsn(ARETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();

        mv = cw.visitMethod(ACC_PRIVATE,
                "<init>",
                "(Ljava/lang/String;I)V",
                "()V",
                null);
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 0);
        mv.visitVarInsn(ALOAD, 1);
        mv.visitVarInsn(ILOAD, 2);
        mv.visitMethodInsn(INVOKESPECIAL,
                "java/lang/Enum",
                "<init>",
                "(Ljava/lang/String;I)V");
        mv.visitInsn(RETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();

        mv = cw.visitMethod(ACC_STATIC, "<clinit>", "()V", null, null);
        mv.visitCode();
        mv.visitTypeInsn(NEW, "pkg/Enum");
        mv.visitInsn(DUP);
        mv.visitLdcInsn("V0");
        mv.visitInsn(ICONST_0);
        mv.visitMethodInsn(INVOKESPECIAL,
                "pkg/Enum",
                "<init>",
                "(Ljava/lang/String;I)V");
        mv.visitFieldInsn(PUTSTATIC, "pkg/Enum", "V0", "Lpkg/Enum;");
        mv.visitTypeInsn(NEW, "pkg/Enum");
        mv.visitInsn(DUP);
        mv.visitLdcInsn("V1");
        mv.visitInsn(ICONST_1);
        mv.visitMethodInsn(INVOKESPECIAL,
                "pkg/Enum",
                "<init>",
                "(Ljava/lang/String;I)V");
        mv.visitFieldInsn(PUTSTATIC, "pkg/Enum", "V1", "Lpkg/Enum;");
        mv.visitTypeInsn(NEW, "pkg/Enum");
        mv.visitInsn(DUP);
        mv.visitLdcInsn("V2");
        mv.visitInsn(ICONST_2);
        mv.visitMethodInsn(INVOKESPECIAL,
                "pkg/Enum",
                "<init>",
                "(Ljava/lang/String;I)V");
        mv.visitFieldInsn(PUTSTATIC, "pkg/Enum", "V2", "Lpkg/Enum;");
        mv.visitInsn(ICONST_3);
        mv.visitTypeInsn(ANEWARRAY, "pkg/Enum");
        mv.visitInsn(DUP);
        mv.visitInsn(ICONST_0);
        mv.visitFieldInsn(GETSTATIC, "pkg/Enum", "V0", "Lpkg/Enum;");
        mv.visitInsn(AASTORE);
        mv.visitInsn(DUP);
        mv.visitInsn(ICONST_1);
        mv.visitFieldInsn(GETSTATIC, "pkg/Enum", "V1", "Lpkg/Enum;");
        mv.visitInsn(AASTORE);
        mv.visitInsn(DUP);
        mv.visitInsn(ICONST_2);
        mv.visitFieldInsn(GETSTATIC, "pkg/Enum", "V2", "Lpkg/Enum;");
        mv.visitInsn(AASTORE);
        mv.visitFieldInsn(PUTSTATIC, "pkg/Enum", "$VALUES", "[Lpkg/Enum;");
        mv.visitInsn(RETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();

        cw.visitEnd();

        return cw.toByteArray();
    }
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    @Override
    public void test() throws Exception {
        ClassReader cr = new ClassReader(is);
        if (cr.readInt(4) != Opcodes.V1_6) {
            try {
                ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
                cr.accept(cw, 0);
                cr = new ClassReader(cw.toByteArray());
            } catch (Exception e) {
                skipTest();
                return;
            }
        }
        ClassWriter cw = new ClassWriter(0);
        ClassVisitor cv = new ClassAdapter(cw) {

            private String owner;

            @Override
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    }

    @Override
    public void test() throws Exception {
        ClassReader cr = new ClassReader(is);
        ClassWriter cw = new ClassWriter(0);
        cr.accept(new ClassAdapter(cw) {
            @Override
            public MethodVisitor visitMethod(
                final int access,
                final String name,
                final String desc,
                final String signature,
                final String[] exceptions)
            {
                MethodVisitor mv = super.visitMethod(access,
                        name,
                        desc,
                        signature,
                        exceptions);
                return new JSRInlinerAdapter(mv,
                        access,
                        name,
                        desc,
                        signature,
                        exceptions);
            }
        }, 0);
        byte[] b = cw.toByteArray();
        try {
            LOADER.defineClass(n, b);
        } catch (ClassFormatError cfe) {
            fail(cfe.getMessage());
        } catch (Throwable ignored) {
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public class StaticInitMergerTest extends TestCase implements Opcodes {

    private final static TestClassLoader LOADER = new TestClassLoader();

    public void test() throws Exception {
        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
        ClassVisitor cv = new StaticInitMerger("$clinit$", cw);
        cv.visit(V1_1, ACC_PUBLIC, "A", null, "java/lang/Object", null);
        cv.visitField(ACC_PUBLIC + ACC_STATIC, "counter", "I", null, null);
        for (int i = 0; i < 5; ++i) {
            MethodVisitor mv = cv.visitMethod(ACC_PUBLIC,
                    "<clinit>",
                    "()V",
                    null,
                    null);
            mv.visitFieldInsn(GETSTATIC, "A", "counter", "I");
            mv.visitInsn(ICONST_1);
            mv.visitInsn(IADD);
            mv.visitFieldInsn(PUTSTATIC, "A", "counter", "I");
            mv.visitInsn(RETURN);
            mv.visitMaxs(0, 0);
        }
        MethodVisitor mv = cv.visitMethod(ACC_PUBLIC,
                "<init>",
                "()V",
                null,
                null);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
        mv.visitInsn(RETURN);
        mv.visitMaxs(0, 0);
        cv.visitEnd();

        Class<?> c = LOADER.defineClass("A", cw.toByteArray());
        assertEquals(c.getField("counter").getInt(c.newInstance()), 5);
    }
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        @Override
        public Class<?> loadClass(final String name) throws ClassNotFoundException
        {
            if (name.startsWith(prefix)) {
                try {
                    ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
                    ClassReader cr = new ClassReader(getClass().getResourceAsStream("/"
                            + name.replace('.', '/') + ".class"));
                    cr.accept(new AdviceClassAdapter(cw),
                            ClassReader.EXPAND_FRAMES);
                    byte[] bytecode = cw.toByteArray();
                    return super.defineClass(name, bytecode, 0, bytecode.length);
                } catch (IOException ex) {
                    throw new ClassNotFoundException("Load error: "
                            + ex.toString(), ex);
                }
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        return new RemappingClassAdapterTest2().getSuite();
    }

    @Override
    public void test() throws Exception {
        ClassWriter cw = new ClassWriter(0);
        ClassReader cr = new ClassReader(is);
        Map<String, String> map = new HashMap<String, String>() {
            @Override
            public String get(Object key) {
                return "Foo";
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    }

    @Override
    public void test() throws Exception {
        ClassReader cr = new ClassReader(is);
        ClassWriter cw = new ClassWriter(0);
        ClassVisitor cv = new TraceClassVisitor(cw,
                new PrintWriter(new CharArrayWriter()));
        cr.accept(cv, new Attribute[] { new Comment(), new CodeComment() }, 0);
        assertEquals(cr, new ClassReader(cw.toByteArray()));
    }
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    public void generate(final String dir) throws IOException {
        generate(dir, "pkg/Insns.class", dump());
    }

    public byte[] dump() {
        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
        FieldVisitor fv;
        MethodVisitor mv;

        cw.visit(V1_5,
                ACC_PUBLIC + ACC_SUPER,
                "pkg/Insns",
                "<E:Ljava/lang/Object;F:Ljava/lang/Exception;>Ljava/util/ArrayList<Ljava/lang/String;>;LInterface<TE;>;",
                "java/util/ArrayList",
                new String[] { "Interface" });

        fv = cw.visitField(ACC_PRIVATE + ACC_FINAL,
                "z",
                "Z",
                null,
                new Integer(1));
        fv.visitEnd();

        fv = cw.visitField(ACC_PROTECTED, "b", "B", null, null);
        fv.visitEnd();

        fv = cw.visitField(ACC_PUBLIC, "c", "C", null, null);
        fv.visitEnd();

        fv = cw.visitField(ACC_STATIC, "s", "S", null, null);
        fv.visitEnd();

        fv = cw.visitField(ACC_PRIVATE + ACC_TRANSIENT, "i", "I", null, null);
        fv.visitEnd();

        fv = cw.visitField(ACC_PRIVATE + ACC_VOLATILE, "l", "J", null, null);
        fv.visitEnd();

        fv = cw.visitField(0, "f", "F", null, null);
        fv.visitEnd();

        fv = cw.visitField(0, "d", "D", null, null);
        fv.visitEnd();

        fv = cw.visitField(0, "str", "Ljava/lang/String;", null, "");
        fv.visitEnd();

        fv = cw.visitField(0, "e", "Ljava/lang/Object;", "TE;", null);
        fv.visitEnd();

        mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKESPECIAL,
                "java/util/ArrayList",
                "<init>",
                "()V");
        mv.visitInsn(RETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();

        mv = cw.visitMethod(ACC_PUBLIC + ACC_SYNCHRONIZED,
                "m",
                "(ZBCSIFJDLjava/lang/Object;)Ljava/lang/Object;",
                "(ZBCSIFJDTE;)TE;",
                null);
        mv.visitCode();
        mv.visitInsn(ACONST_NULL);
        mv.visitInsn(ARETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();

        // instruction types
        constInsns(cw);
        varInsns(cw);
        arrayInsns(cw);
        stackInsns(cw);
        mathInsns(cw);
        castInsns(cw);
        jumpInsns(cw);
        returnInsns(cw);
        fieldInsns(cw);
        methodInsns(cw);
        monitorInsns(cw);

        // various method types not covered by other test cases
        varargMethod(cw);
        bridgeMethod(cw);
        nativeMethod(cw);
        clinitMethod(cw);

        cw.visitEnd();

        return cw.toByteArray();
    }
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