Examples of org.ow2.asm.Label

org.ow2.asm.Label
A label represents a position in the bytecode of a method. Labels are used for jump, goto, and switch instructions, and for try catch blocks. A label designates the instruction that is just after. Note however that there can be other elements between a label and the instruction it designates (such as other labels, stack map frames, line numbers, etc.). @author Eric Bruneton

     */
    final class TryCatchRule extends Rule {


        @Override
        public final void begin(final String name, final Attributes attrs) {
            Label start = getLabel(attrs.getValue("start"));
            Label end = getLabel(attrs.getValue("end"));
            Label handler = getLabel(attrs.getValue("handler"));
            String type = attrs.getValue("type");
            getCodeVisitor().visitTryCatchBlock(start, end, handler, type);
        }

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    final class LineNumberRule extends Rule {


        @Override
        public final void begin(final String name, final Attributes attrs) {
            int line = Integer.parseInt(attrs.getValue("line"));
            Label start = getLabel(attrs.getValue("start"));
            getCodeVisitor().visitLineNumber(line, start);
        }

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        @Override
        public final void begin(final String element, final Attributes attrs) {
            String name = attrs.getValue("name");
            String desc = attrs.getValue("desc");
            String signature = attrs.getValue("signature");
            Label start = getLabel(attrs.getValue("start"));
            Label end = getLabel(attrs.getValue("end"));
            int var = Integer.parseInt(attrs.getValue("var"));
            getCodeVisitor().visitLocalVariable(name,
                    desc,
                    signature,
                    start,

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                    case '[':
                        p = storeP(mv, p);
                        d = storeD(mv, d);


                        Label ls = new Label();
                        Label le = new Label();
                        labels.push(ls);
                        labels.push(le);
                        mv.visitJumpInsn(GOTO, le);
                        mv.visitLabel(ls);
                        break;

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     * Creates a new {@link Label}.
     *
     * @return a new {@link Label}.
     */
    public Label newLabel() {
        return new Label();
    }

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     * Marks the current code position with a new label.
     *
     * @return the label that was created to mark the current code position.
     */
    public Label mark() {
        Label label = new Label();
        mv.visitLabel(label);
        return label;
    }

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        for (int i = 1; i < keys.length; ++i) {
            if (keys[i] < keys[i - 1]) {
                throw new IllegalArgumentException("keys must be sorted ascending");
            }
        }
        Label def = newLabel();
        Label end = newLabel();
        if (keys.length > 0) {
            int len = keys.length;
            int min = keys[0];
            int max = keys[len - 1];
            int range = max - min + 1;
            if (useTable) {
                Label[] labels = new Label[range];
                Arrays.fill(labels, def);
                for (int i = 0; i < len; ++i) {
                    labels[keys[i] - min] = newLabel();
                }
                mv.visitTableSwitchInsn(min, max, def, labels);
                for (int i = 0; i < range; ++i) {
                    Label label = labels[i];
                    if (label != def) {
                        mark(label);
                        generator.generateCase(i + min, end);
                    }
                }

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    @Override
    public void visitTypeInsn(final int opcode, final String type) {
        if (opcode == Opcodes.NEW) {
            if (labels == null) {
                Label l = new Label();
                labels = new ArrayList<Label>(3);
                labels.add(l);
                if (mv != null) {
                    mv.visitLabel(l);
                }

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        if (!classOptimizer.class$) {
            MethodVisitor mv = classOptimizer.visitMethod(ACC_STATIC | ACC_SYNTHETIC,
                    "class$", "(Ljava/lang/String;)Ljava/lang/Class;", null, null);
            mv.visitCode();
            Label l0 = new Label();
            Label l1 = new Label();
            Label l2 = new Label();
            mv.visitTryCatchBlock(l0, l1, l2, "java/lang/ClassNotFoundException");
            mv.visitLabel(l0);
            mv.visitVarInsn(ALOAD, 0);
            mv.visitMethodInsn(INVOKESTATIC,
                    "java/lang/Class",
                    "forName",
                    "(Ljava/lang/String;)Ljava/lang/Class;");
            mv.visitLabel(l1);
            mv.visitInsn(ARETURN);
            mv.visitLabel(l2);
            mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/ClassNotFoundException", "getMessage", "()Ljava/lang/String;");
            mv.visitVarInsn(ASTORE, 1);
            mv.visitTypeInsn(NEW, "java/lang/NoClassDefFoundError");
            mv.visitInsn(DUP);
            mv.visitVarInsn(ALOAD, 1);
            mv.visitMethodInsn(INVOKESPECIAL,
                    "java/lang/NoClassDefFoundError", "<init>", "(Ljava/lang/String;)V");
            mv.visitInsn(ATHROW);
            mv.visitMaxs(3, 2);
            mv.visitEnd();


            classOptimizer.class$ = true;
        }


        String clsName = classOptimizer.clsName;
        mv.visitFieldInsn(GETSTATIC, clsName, fieldName, "Ljava/lang/Class;");
        Label elseLabel = new Label();
        mv.visitJumpInsn(IFNONNULL, elseLabel);
        mv.visitLdcInsn(ldcName.replace('/', '.'));
        mv.visitMethodInsn(INVOKESTATIC,
                clsName,
                "class$",
                "(Ljava/lang/String;)Ljava/lang/Class;");
        mv.visitInsn(DUP);
        mv.visitFieldInsn(PUTSTATIC, clsName, fieldName, "Ljava/lang/Class;");
        Label endLabel = new Label();
        mv.visitJumpInsn(GOTO, endLabel);
        mv.visitLabel(elseLabel);
        mv.visitFieldInsn(GETSTATIC, clsName, fieldName, "Ljava/lang/Class;");
        mv.visitLabel(endLabel);
    }

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        return LABEL;
    }


    public Label getLabel() {
        if (label == null) {
            label = new Label();
        }
        return label;
    }

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