Package org.ow2.asm

Examples of org.ow2.asm.ClassWriter

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        return cw.toByteArray();
    }

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

        cw.visit(V1_1, ACC_PUBLIC, "pkg/JSR2", null, "java/lang/Object", null);

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

        mv = cw.visitMethod(ACC_PUBLIC, "backwardJSR", "([I)V", null, null);
        mv.visitCode();
        Label l0 = new Label();
        Label l1 = new Label();
        Label l2 = new Label();
        Label l3 = new Label();
        Label l4 = new Label();
        Label l5 = new Label();
        Label l6 = new Label();
        mv.visitTryCatchBlock(l0, l1, l2, null);
        mv.visitTryCatchBlock(l2, l3, l2, null);
        mv.visitInsn(ICONST_0);
        mv.visitVarInsn(ISTORE, 4);
        mv.visitJumpInsn(GOTO, l0);
        mv.visitLabel(l4);
        mv.visitVarInsn(ASTORE, 3);
        mv.visitIincInsn(4, 1);
        mv.visitVarInsn(RET, 3);

        /* extra instructions only used to trigger method resizing */
        mv.visitLabel(l0);
        mv.visitInsn(ACONST_NULL);
        mv.visitJumpInsn(IFNULL, l6); // will give wide IFNULL
        // many NOPs will be introduced here by the method resizing test
        mv.visitJumpInsn(GOTO, l6);
        mv.visitLabel(l6);

        mv.visitJumpInsn(JSR, l4); // backward JSR, will give JSR_W
        mv.visitLabel(l1);
        mv.visitJumpInsn(GOTO, l5);
        mv.visitLabel(l2);
        mv.visitVarInsn(ASTORE, 2);
        mv.visitJumpInsn(JSR, l4);
        mv.visitLabel(l3);
        mv.visitVarInsn(ALOAD, 2);
        mv.visitInsn(ATHROW);
        mv.visitLabel(l5);
        mv.visitInsn(RETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();

        cw.visitEnd();

        return cw.toByteArray();
    }
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        generate(dir, "pkg/Annotation.class", dumpAnnotation());
        generate(dir, "pkg/Annotated.class", dumpAnnotated());
    }

    public byte[] dumpAnnotation() {
        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
        MethodVisitor mv;
        AnnotationVisitor av0, av1;

        cw.visit(V1_5,
                ACC_PUBLIC + ACC_ANNOTATION + ACC_ABSTRACT + ACC_INTERFACE,
                "pkg/Annotation",
                null,
                "java/lang/Object",
                new String[] { "java/lang/annotation/Annotation" });

        mv = cw.visitMethod(M, "byteValue", "()B", null, null);
        av0 = mv.visitAnnotationDefault();
        av0.visit(null, new Byte((byte) 1));
        av0.visitEnd();
        mv.visitEnd();

        mv = cw.visitMethod(M, "charValue", "()C", null, null);
        av0 = mv.visitAnnotationDefault();
        av0.visit(null, new Character((char) 1));
        av0.visitEnd();
        mv.visitEnd();

        mv = cw.visitMethod(M, "booleanValue", "()Z", null, null);
        av0 = mv.visitAnnotationDefault();
        av0.visit(null, Boolean.TRUE);
        av0.visitEnd();
        mv.visitEnd();

        mv = cw.visitMethod(M, "intValue", "()I", null, null);
        av0 = mv.visitAnnotationDefault();
        av0.visit(null, new Integer(1));
        av0.visitEnd();
        mv.visitEnd();

        mv = cw.visitMethod(M, "shortValue", "()S", null, null);
        av0 = mv.visitAnnotationDefault();
        av0.visit(null, new Short((short) 1));
        av0.visitEnd();
        mv.visitEnd();

        mv = cw.visitMethod(M, "longValue", "()J", null, null);
        av0 = mv.visitAnnotationDefault();
        av0.visit(null, new Long(1L));
        av0.visitEnd();
        mv.visitEnd();

        mv = cw.visitMethod(M, "floatValue", "()F", null, null);
        av0 = mv.visitAnnotationDefault();
        av0.visit(null, new Float("1.0"));
        av0.visitEnd();
        mv.visitEnd();

        mv = cw.visitMethod(M, "doubleValue", "()D", null, null);
        av0 = mv.visitAnnotationDefault();
        av0.visit(null, new Double("1.0"));
        av0.visitEnd();
        mv.visitEnd();

        mv = cw.visitMethod(M, "stringValue", "()" + STRING, null, null);
        av0 = mv.visitAnnotationDefault();
        av0.visit(null, "1");
        av0.visitEnd();
        mv.visitEnd();

        mv = cw.visitMethod(M, "classValue", "()" + CLASS, null, null);
        av0 = mv.visitAnnotationDefault();
        av0.visit(null, Type.getType("Lpkg/Annotation;"));
        av0.visitEnd();
        mv.visitEnd();

        mv = cw.visitMethod(M, "enumValue", "()Lpkg/Enum;", null, null);
        av0 = mv.visitAnnotationDefault();
        av0.visitEnum(null, "Lpkg/Enum;", "V1");
        av0.visitEnd();
        mv.visitEnd();

        mv = cw.visitMethod(M, "annotationValue", "()" + DOC, null, null);
        av0 = mv.visitAnnotationDefault();
        av1 = av0.visitAnnotation(null, DOC);
        av1.visitEnd();
        av0.visitEnd();
        mv.visitEnd();

        mv = cw.visitMethod(M, "byteArrayValue", "()[B", null, null);
        av0 = mv.visitAnnotationDefault();
        av0.visit(null, new byte[] { 0, 1 });
        av0.visitEnd();
        mv.visitEnd();

        mv = cw.visitMethod(M, "charArrayValue", "()[C", null, null);
        av0 = mv.visitAnnotationDefault();
        av0.visit(null, new char[] { '0', '1' });
        av0.visitEnd();
        mv.visitEnd();

        mv = cw.visitMethod(M, "booleanArrayValue", "()[Z", null, null);
        av0 = mv.visitAnnotationDefault();
        av0.visit(null, new boolean[] { false, true });
        av0.visitEnd();
        mv.visitEnd();

        mv = cw.visitMethod(M, "intArrayValue", "()[I", null, null);
        av0 = mv.visitAnnotationDefault();
        av0.visit(null, new int[] { 0, 1 });
        av0.visitEnd();
        mv.visitEnd();

        mv = cw.visitMethod(M, "shortArrayValue", "()[S", null, null);
        av0 = mv.visitAnnotationDefault();
        av0.visit(null, new short[] { (short) 0, (short) 1 });
        av0.visitEnd();
        mv.visitEnd();

        mv = cw.visitMethod(M, "longArrayValue", "()[J", null, null);
        av0 = mv.visitAnnotationDefault();
        av0.visit(null, new long[] { 0L, 1L });
        av0.visitEnd();
        mv.visitEnd();

        mv = cw.visitMethod(M, "floatArrayValue", "()[F", null, null);
        av0 = mv.visitAnnotationDefault();
        av0.visit(null, new float[] { 0.0f, 1.0f });
        av0.visitEnd();
        mv.visitEnd();

        mv = cw.visitMethod(M, "doubleArrayValue", "()[D", null, null);
        av0 = mv.visitAnnotationDefault();
        av0.visit(null, new double[] { 0.0d, 1.0d });
        av0.visitEnd();
        mv.visitEnd();

        mv = cw.visitMethod(M, "stringArrayValue", "()" + STRING, null, null);
        av0 = mv.visitAnnotationDefault();
        av1 = av0.visitArray(null);
        av1.visit(null, "0");
        av1.visit(null, "1");
        av1.visitEnd();
        av0.visitEnd();
        mv.visitEnd();

        mv = cw.visitMethod(M, "classArrayValue", "()[" + CLASS, null, null);
        av0 = mv.visitAnnotationDefault();
        av1 = av0.visitArray(null);
        av1.visit(null, Type.getType("Lpkg/Annotation;"));
        av1.visit(null, Type.getType("Lpkg/Annotation;"));
        av1.visitEnd();
        av0.visitEnd();
        mv.visitEnd();

        mv = cw.visitMethod(M, "enumArrayValue", "()[Lpkg/Enum;", null, null);
        av0 = mv.visitAnnotationDefault();
        av1 = av0.visitArray(null);
        av1.visitEnum(null, "Lpkg/Enum;", "V0");
        av1.visitEnum(null, "Lpkg/Enum;", "V1");
        av1.visitEnd();
        av0.visitEnd();
        mv.visitEnd();

        mv = cw.visitMethod(M, "annotationArrayValue", "()[" + DOC, null, null);
        av0 = mv.visitAnnotationDefault();
        av1 = av0.visitArray(null);
        av1.visitAnnotation(null, DOC).visitEnd();
        av1.visitAnnotation(null, DOC).visitEnd();
        av1.visitEnd();
        av0.visitEnd();
        mv.visitEnd();

        cw.visitEnd();

        return cw.toByteArray();
    }
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        return cw.toByteArray();
    }

    public byte[] dumpAnnotated() {
        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
        FieldVisitor fv;
        MethodVisitor mv;
        AnnotationVisitor av0, av1;

        cw.visit(V1_5,
                ACC_PUBLIC + ACC_SUPER,
                "pkg/Annotated",
                null,
                "java/lang/Object",
                null);

        // visible class annotation
        cw.visitAnnotation(DEPRECATED, true).visitEnd();

        // invisible class annotation, with values of all types
        av0 = cw.visitAnnotation("Lpkg/Annotation;", false);
        av0.visit("byteValue", new Byte((byte) 0));
        av0.visit("charValue", new Character((char) 48));
        av0.visit("booleanValue", Boolean.FALSE);
        av0.visit("intValue", new Integer(0));
        av0.visit("shortValue", new Short((short) 0));
        av0.visit("longValue", new Long(0L));
        av0.visit("floatValue", new Float("0.0"));
        av0.visit("doubleValue", new Double("0.0"));
        av0.visit("stringValue", "0");
        av0.visitEnum("enumValue", "Lpkg/Enum;", "V0");
        av0.visitAnnotation("annotationValue", DOC).visitEnd();
        av0.visit("classValue", Type.getType("Lpkg/Annotation;"));
        av0.visit("byteArrayValue", new byte[] { 1, 0 });
        av0.visit("charArrayValue", new char[] { '1', '0' });
        av0.visit("booleanArrayValue", new boolean[] { true, false });
        av0.visit("intArrayValue", new int[] { 1, 0 });
        av0.visit("shortArrayValue", new short[] { (short) 1, (short) 0 });
        av0.visit("longArrayValue", new long[] { 1L, 0L });
        av0.visit("floatArrayValue", new float[] { 1.0f, 0.0f });
        av0.visit("doubleArrayValue", new double[] { 1.0d, 0.0d });
        av1 = av0.visitArray("stringArrayValue");
        av1.visit(null, "1");
        av1.visit(null, "0");
        av1.visitEnd();
        av0.visitArray("classArrayValue").visitEnd();
        av1 = av0.visitArray("enumArrayValue");
        av1.visitEnum(null, "Lpkg/Enum;", "V1");
        av1.visitEnum(null, "Lpkg/Enum;", "V2");
        av1.visitEnd();
        av0.visitArray("annotationArrayValue").visitEnd();
        av0.visitEnd();

        fv = cw.visitField(ACC_PUBLIC, "f", "I", null, null);
        // visible field annotation
        fv.visitAnnotation(DEPRECATED, true).visitEnd();
        // invisible field annotation
        av0 = fv.visitAnnotation("Lpkg/Annotation;", false);
        av0.visitEnum("enumValue", "Lpkg/Enum;", "V0");
        av0.visitEnd();
        fv.visitEnd();

        mv = cw.visitMethod(ACC_PUBLIC, "<init>", "(IIIIIIIIII)V", null, null);
        // visible method annotation
        mv.visitAnnotation(DEPRECATED, true).visitEnd();
        // invisible method annotation
        av0 = mv.visitAnnotation("Lpkg/Annotation;", false);
        av0.visitAnnotation("annotationValue", DOC).visitEnd();
        av0.visitEnd();
        // synthetic parameter annotation
        mv.visitParameterAnnotation(0, "Ljava/lang/Synthetic;", false);
        // visible parameter annotation
        mv.visitParameterAnnotation(8, DEPRECATED, true).visitEnd();
        // invisible parameter annotation
        av0 = mv.visitParameterAnnotation(8, "Lpkg/Annotation;", false);
        av0.visitArray("stringArrayValue").visitEnd();
        av0.visitEnd();
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
        mv.visitInsn(RETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();

        return cw.toByteArray();
    }
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        ClassReader cr = new ClassReader(getClass().getName());
        CheckClassAdapter.verify(cr, true, new PrintWriter(System.err));
    }

    public void testVerifyInvalidClass() {
        ClassWriter cw = new ClassWriter(0);
        cw.visit(V1_1, ACC_PUBLIC, "C", null, "java/lang/Object", null);
        MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "m", "()V", null, null);
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 0);
        mv.visitVarInsn(ISTORE, 30);
        mv.visitInsn(RETURN);
        mv.visitMaxs(1, 31);
        mv.visitEnd();
        cw.visitEnd();
        ClassReader cr = new ClassReader(cw.toByteArray());
        CheckClassAdapter.verify(cr, true, new PrintWriter(System.err));
    }
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        }
    }
   
    public void testIllegalDebugLabelUse() throws IOException {
        ClassReader cr = new ClassReader("java.lang.Object");
        ClassWriter cw = new ClassWriter(cr, ClassWriter.COMPUTE_MAXS);
        ClassVisitor cv = new ClassAdapter(cw) {
            @Override
            public MethodVisitor visitMethod(
                int access,
                String name,
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    public void generate(final String dir) throws IOException {
        generate(dir, "pkg/Wide.class", dump());
    }

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

        cw.visit(V1_2, ACC_PUBLIC, "pkg/Wide", null, "java/lang/Object", null);

        mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
        for (int i = 0; i < 256; ++i) {
            mv.visitLdcInsn(Integer.toString(i)); // wide form
            mv.visitInsn(POP);
        }
        mv.visitInsn(RETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();

        mv = cw.visitMethod(ACC_PUBLIC, "wideLocals", "(I)I", null, null);
        mv.visitCode();
        Label l0 = new Label();
        Label l1 = new Label();
        mv.visitJumpInsn(GOTO, l1); // will give GOTO_W

        mv.visitLabel(l0);
        mv.visitIincInsn(300, 1); // covers 'update maxlocals' in MethodWriter
        mv.visitVarInsn(ILOAD, 300); // will give wide form
        mv.visitJumpInsn(IFEQ, l1); // will give long forward jump

        // many NOPs will be introduced here by the method resizing test

        mv.visitVarInsn(ILOAD, 300); // will give wide form
        mv.visitInsn(IRETURN);

        mv.visitLabel(l1);
        for (int i = 1; i < 300; ++i) {
            mv.visitVarInsn(ILOAD, i);
            if (i <= 5) {
                mv.visitInsn(ICONST_0 + i);
            } else if (i <= Byte.MAX_VALUE) {
                mv.visitIntInsn(BIPUSH, i);
            } else {
                mv.visitIntInsn(SIPUSH, i);
            }
            mv.visitInsn(IADD);
            mv.visitVarInsn(ISTORE, i + 1);
        }
        mv.visitInsn(ICONST_0);
        mv.visitJumpInsn(IFEQ, l0); // will give long backward jump
        mv.visitJumpInsn(GOTO, l0); // will give long backward goto

        mv.visitMaxs(0, 0);
        mv.visitEnd();

        cw.visitEnd();

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

    public byte[] dump() {
        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);

        cw.visit(V1_5,
                ACC_PUBLIC + ACC_SUPER,
                "pkg/Debug",
                null,
                "java/lang/Object",
                new String[] { "java/io/Serializable" });

        cw.visitSource("Debug.java", "source-debug");

        FieldVisitor fv = cw.visitField(ACC_FINAL + ACC_STATIC,
                "serialVersionUID",
                "J",
                null,
                new Long(1L));
        fv.visitEnd();

        MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
                "<init>",
                "()V",
                null,
                null);
        mv.visitCode();
        Label l0 = new Label();
        Label l1 = new Label();
        Label l2 = new Label();
        mv.visitLabel(l0);
        mv.visitLineNumber(3, l0);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
        mv.visitInsn(ICONST_0);
        mv.visitJumpInsn(IFEQ, l1);
        mv.visitJumpInsn(GOTO, l1);
        mv.visitLabel(l1);
        mv.visitLineNumber(3, l1);
        mv.visitInsn(RETURN);
        mv.visitLabel(l2);
        mv.visitLocalVariable("this", "Lpkg/Debug;", "Lpkg/Debug;", l0, l2, 0);
        mv.visitMaxs(0, 0);
        mv.visitEnd();

        cw.visitEnd();

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

    public byte[] dump() {
        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);

        cw.visit(1 << 16 | V1_5,
                ACC_PUBLIC + ACC_ABSTRACT + ACC_INTERFACE,
                "Interface",
                "<E:Ljava/lang/Object;>Ljava/lang/Object;",
                "java/lang/Object",
                null);

        MethodVisitor mv = cw.visitMethod(ACC_PUBLIC + ACC_ABSTRACT,
                "m",
                "(ZBCSIFJDLjava/lang/Object;)Ljava/lang/Object;",
                "(ZBCSIFJDTE;)TE;",
                null);
        mv.visitEnd();

        cw.visitEnd();

        return cw.toByteArray();
    }
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        /*
         * Returns the byte code of a class corresponding to this expression.
         */
        byte[] compile(final String name) {
            // class header
            ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
            cw.visit(V1_7,
                    ACC_PUBLIC,
                    name,
                    null,
                    "java/lang/Object",
                    null);

            // eval method type
            StringBuilder desc = new StringBuilder("(");
            for (int i = 0; i <= getMaxVarIndex(); ++i) {
                desc.append("Ljava/lang/Object;");
            }
            desc.append(")Ljava/lang/Object;");
           
            // eval method
            MethodVisitor mv = cw.visitMethod(ACC_PUBLIC | ACC_STATIC,
                    "eval",
                    desc.toString(),
                    null,
                    null);
            compile(mv);
            mv.visitInsn(ARETURN);
            // max stack and max locals automatically computed
            mv.visitMaxs(0, 0);
            mv.visitEnd();

            return cw.toByteArray();
        }
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public class Attributes extends ClassLoader {

    public static void main(final String args[]) throws Exception {
        // loads the original class and adapts it
        ClassReader cr = new ClassReader("CommentAttribute");
        ClassWriter cw = new ClassWriter(0);
        ClassVisitor cv = new AddCommentClassAdapter(cw);
        cr.accept(cv, new Attribute[] { new CommentAttribute("") }, 0);
        byte[] b = cw.toByteArray();

        // stores the adapted class on disk
        FileOutputStream fos = new FileOutputStream("CommentAttribute.class.new");
        try {
            fos.write(b);
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