Examples of br.com.caelum.vraptor.asm.Label

br.com.caelum.vraptor.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. @author Eric Bruneton


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

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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 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, end, var);
        }

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            }
            return sb.toString();
        }


        protected final Label getLabel(final Object label) {
            Label lbl = (Label) labels.get(label);
            if (lbl == null) {
                lbl = new Label();
                labels.put(label, lbl);
            }
            return lbl;
        }

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        return LABEL;
    }


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

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        @Override
        public final void end(final String name) {
            Map vals = (HashMap) pop();
            int min = Integer.parseInt((String) vals.get("min"));
            int max = Integer.parseInt((String) vals.get("max"));
            Label dflt = getLabel(vals.get("dflt"));
            List lbls = (List) vals.get("labels");
            Label[] labels = (Label[]) lbls.toArray(new Label[lbls.size()]);
            getCodeVisitor().visitTableSwitchInsn(min, max, dflt, labels);
        }

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        }


        @Override
        public final void end(final String name) {
            Map vals = (HashMap) pop();
            Label dflt = getLabel(vals.get("dflt"));
            List keyList = (List) vals.get("keys");
            List lbls = (List) vals.get("labels");
            Label[] labels = (Label[]) lbls.toArray(new Label[lbls.size()]);
            int[] keys = new int[keyList.size()];
            for (int i = 0; i < keys.length; i++) {

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     */
    private 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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br.com.caelum.vraptor.asm.xml.ASMContentHandler$LineNumberRule

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br.com.caelum.vraptor.asm.xml.ASMContentHandler$TableSwitchRule

br.com.caelum.vraptor.asm.xml.ASMContentHandler$TryCatchRule

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