Example usage for org.objectweb.asm Label Label

List of usage examples for org.objectweb.asm Label Label

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Introduction

In this page you can find the example usage for org.objectweb.asm Label Label.

Prototype

public Label()

Source Link

Document

Constructs a new label.

Usage

From source file:com.nginious.http.xsp.XspCompiler.java

License:Apache License

/**
 * Creates subclass of {@link XspService} for the XSP file represented by the specified document
 * tree node structure./* w w w  .j a  va 2 s.co m*/
 * 
 * @param document the document tree node structure
 * @param srcFilePath the XSP file source path
 * @return a descriptor for the generated subclass
 * @throws XspException if unable to create subclass
 */
private ClassDescriptor compileService(DocumentPart document, String srcFilePath) throws XspException {
    ClassWriter writer = new ClassWriter(0);

    // Create class
    String packageName = document.getMetaContent("package");
    String intServiceClazzName = createIntServiceClassName(packageName, srcFilePath);
    String serviceClazzName = createServiceClassName(packageName, srcFilePath);
    writer.visit(Opcodes.V1_6, Opcodes.ACC_PUBLIC, intServiceClazzName, "Lcom/nginious/http/xsp/XspService;",
            "com/nginious/http/xsp/XspService", null);

    // Create constructor
    createConstructor(writer, "com/nginious/http/xsp/XspService");

    // Create xsp service method
    MethodVisitor visitor = createXspMethod(writer);

    Label tryLabel = new Label();
    Label startCatchLabel = new Label();
    Label endCatchLabel = new Label();

    // Start try block
    visitor.visitTryCatchBlock(tryLabel, startCatchLabel, endCatchLabel, "java/lang/Throwable");

    visitor.visitLabel(tryLabel);

    visitor.visitTypeInsn(Opcodes.NEW, "com/nginious/http/xsp/expr/HttpRequestVariables");
    visitor.visitInsn(Opcodes.DUP);
    visitor.visitVarInsn(Opcodes.ALOAD, 1);
    visitor.visitMethodInsn(Opcodes.INVOKESPECIAL, "com/nginious/http/xsp/expr/HttpRequestVariables", "<init>",
            "(Lcom/nginious/http/HttpRequest;)V");
    visitor.visitMethodInsn(Opcodes.INVOKESTATIC, "com/nginious/http/xsp/expr/Expression", "setVariables",
            "(Lcom/nginious/http/xsp/expr/Variables;)V");

    document.compile(intServiceClazzName, writer, visitor);

    visitor.visitLabel(startCatchLabel);
    visitor.visitMethodInsn(Opcodes.INVOKESTATIC, "com/nginious/http/xsp/expr/Expression", "removeVariables",
            "()V");

    visitor.visitLdcInsn(true);
    visitor.visitInsn(Opcodes.IRETURN);

    // Start finally block
    visitor.visitLabel(endCatchLabel);
    visitor.visitMethodInsn(Opcodes.INVOKESTATIC, "com/nginious/http/xsp/expr/Expression", "removeVariables",
            "()V");
    visitor.visitInsn(Opcodes.ATHROW);

    visitor.visitMaxs(12, 12);
    visitor.visitEnd();

    document.compileMethod(intServiceClazzName, writer);

    writer.visitEnd();
    byte[] clazzBytes = writer.toByteArray();
    return new ClassDescriptor(serviceClazzName, clazzBytes);
}

From source file:com.nway.spring.jdbc.bean.AsmBeanProcessor.java

License:Apache License

/**
 *
 *
 * @param mv/*w w w. ja  v a  2  s .  c o m*/
 * @param beanName com/nway/commons/dbutils/test/User
 * @param lineNumber
 * @return
 */
private Label firstLabel(MethodVisitor mv, String beanName, int lineNumber) {

    Label label = new Label();
    mv.visitLabel(label);
    mv.visitLineNumber(lineNumber, label);

    return label;
}

From source file:com.nway.spring.jdbc.bean.AsmBeanProcessor.java

License:Apache License

private void visitLabel(MethodVisitor mv, int lineNumber) {

    Label label = new Label();
    mv.visitLabel(label);//w  w  w  .j  av a  2  s  .c  om
    mv.visitLineNumber(lineNumber, label);
}

From source file:com.nway.spring.jdbc.bean.AsmBeanProcessor.java

License:Apache License

/**
 *
 * /*from ww  w. jav a 2  s . c om*/
 *
 * @param cw
 * @param mv
 * @param processorName com/nway/commons/dbutils/DynamicBeanProcessorImpl
 * @param beanName com/nway/commons/dbutils/test/User
 * @return [0]:bean[1]createBean
 */
private Object[] prepScript(ClassWriter cw, MethodVisitor mv, String processorName, String beanName) {

    Object[] lab = new Object[2];

    cw.visit(Opcodes.V1_5, Opcodes.ACC_PUBLIC + Opcodes.ACC_SUPER, processorName, null,
            "com/nway/spring/jdbc/bean/DbBeanFactory", null);

    cw.visitSource(processorName.substring(processorName.lastIndexOf('/') + 1) + ".java", null);

    {
        mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "<init>", "()V", null, null);
        mv.visitCode();
        Label l0 = new Label();
        mv.visitLabel(l0);
        mv.visitLineNumber(6, l0);
        mv.visitVarInsn(Opcodes.ALOAD, 0);
        mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "com/nway/spring/jdbc/bean/DbBeanFactory", "<init>", "()V",
                false);
        mv.visitInsn(Opcodes.RETURN);
        Label l1 = new Label();
        mv.visitLabel(l1);
        mv.visitLocalVariable("this", "L" + processorName + ";", null, l0, l1, 0);
        mv.visitMaxs(1, 1);
        mv.visitEnd();
    }
    {
        mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "createBean",
                "(Ljava/sql/ResultSet;Ljava/lang/Class;)Ljava/lang/Object;",
                "<T:Ljava/lang/Object;>(Ljava/sql/ResultSet;Ljava/lang/Class<TT;>;)TT;",
                new String[] { "java/sql/SQLException" });
        mv.visitCode();
        Label l0 = new Label();
        mv.visitLabel(l0);
        mv.visitLineNumber(10, l0);
        mv.visitTypeInsn(Opcodes.NEW, beanName);
        mv.visitInsn(Opcodes.DUP);
        mv.visitMethodInsn(Opcodes.INVOKESPECIAL, beanName, "<init>", "()V", false);
        mv.visitVarInsn(Opcodes.ASTORE, 3);

        lab[0] = l0;
        lab[1] = mv;
    }

    return lab;
}

From source file:com.nway.spring.jdbc.bean.AsmBeanProcessor.java

License:Apache License

/**
 *
 * //from  www.ja v  a  2 s  . c o  m
 *
 * @param mv MethodVisitor
 * @param processorName com/nway/commons/dbutils/DynamicBeanProcessorImpl
 * @param beanName com/nway/commons/dbutils/test/User
 */
private void endScript(MethodVisitor mv, Label processorLabel, Label beanStart, int lineNumber,
        String processorName, String beanName) {

    Label l10 = new Label();
    mv.visitLabel(l10);
    mv.visitLineNumber(lineNumber, l10);
    mv.visitVarInsn(Opcodes.ALOAD, 3);
    mv.visitInsn(Opcodes.ARETURN);
    Label l11 = new Label();
    mv.visitLabel(l11);
    mv.visitLocalVariable("this", "L" + processorName + ";", null, processorLabel, l11, 0);
    mv.visitLocalVariable("rs", "Ljava/sql/ResultSet;", null, processorLabel, l11, 1);
    mv.visitLocalVariable("type", "Ljava/lang/Class;", "Ljava/lang/Class<TT;>;", processorLabel, l11, 2);
    mv.visitLocalVariable("bean", "L" + beanName + ";", null, beanStart, l11, 3);
    mv.visitMaxs(5, 4);
    mv.visitEnd();
}

From source file:com.peergreen.jartransformer.adapter.expiration.ExpirationDateMethodAdapter.java

License:Apache License

/**
 * Adds instruction just after the start of the method code.
 *///from w  w w  .j a v  a2  s. c o m
@Override
public void visitCode() {

    // Adds the following code
    // static {
    //    if (System.currentTimeMillis() < "NOW" || System.currentTimeMillis() > 1364376812157L) {
    //        throw new IllegalStateException("This Peergreen Server has expired. Please download a new version on http://www.peergreen.com");
    //    }
    // }

    mv.visitMethodInsn(INVOKESTATIC, "java/lang/System", "currentTimeMillis", "()J");
    mv.visitLdcInsn(System.currentTimeMillis());
    mv.visitInsn(LCMP);
    Label l1 = new Label();
    mv.visitJumpInsn(IFLT, l1);
    mv.visitMethodInsn(INVOKESTATIC, "java/lang/System", "currentTimeMillis", "()J");
    mv.visitLdcInsn(Long.valueOf(expirationDate));
    mv.visitInsn(LCMP);
    Label l2 = new Label();
    mv.visitJumpInsn(IFLE, l2);
    mv.visitLabel(l1);
    mv.visitFrame(F_SAME, 0, null, 0, null);
    mv.visitTypeInsn(NEW, "java/lang/IllegalStateException");
    mv.visitInsn(DUP);
    mv.visitLdcInsn(
            "The Peergreen Server has expired. Please download a new version on http://www.peergreen.com");
    mv.visitMethodInsn(INVOKESPECIAL, "java/lang/IllegalStateException", "<init>", "(Ljava/lang/String;)V");
    mv.visitInsn(ATHROW);
    mv.visitLabel(l2);
    mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
    super.visitCode();
}

From source file:com.quartercode.jtimber.rh.agent.util.ASMUtils.java

License:Open Source License

/**
 * Generates the instructions to call the {@code addParent()} or {@code removeParent()} method on an object using {@code this} as the parent.
 * Note that an instanceof check is be executed beforehand in order to check whether the object is non-null and parent-aware.<br>
 * <br>//from   w ww.j  a va  2 s  . c o m
 * The object the operation should be performed on needs to be the topmost value on the stack when the generated instructions are entered.
 * The rest of the stack is ignored by the generated instructions.
 * 
 * @param mv The {@link MethodVisitor} that should be used to generate the instructions.
 * @param methodName The name of the method to call ({@code "addParent"} or {@code "removeParent"}).
 */
public static void generateAddOrRemoveThisAsParent(MethodVisitor mv, String methodName) {

    // Skip the if-block if the condition below isn't true
    Label endIf = new Label();
    mv.visitInsn(DUP);
    mv.visitTypeInsn(INSTANCEOF, PARENT_AWARE_CLASS);
    mv.visitJumpInsn(IFEQ, endIf);

    /* if (object instanceof ParentAware) */
    {
        // Push a copy of the value because the parent watcher method will be invoked on it
        mv.visitInsn(DUP);

        // Push "this" because it will be used as the first argument for the following method call
        mv.visitVarInsn(ALOAD, 0);

        // Invoke the parent watcher method on the value (which implements the "ParentAware" interface) using "this" as the first argument
        mv.visitMethodInsn(INVOKEINTERFACE, PARENT_AWARE_CLASS, methodName, "(" + NODE_DESC + ")V", true);
    }

    mv.visitLabel(endIf);
}

From source file:com.retroduction.carma.transformer.CharacterRangeTable.java

License:Open Source License

@Override
protected Attribute read(ClassReader cr, int off, int len, char[] buf, int codeOff, Label[] labels) {

    CharacterRangeTable crt = new CharacterRangeTable();

    ByteBuffer bb = ByteBuffer.wrap(cr.b, off, len);
    bb.order(ByteOrder.BIG_ENDIAN);

    int characterRangeTableLength = bb.getChar();

    CRTLookup lookup = new CRTLookup();

    List<CRTEntry> entries = new ArrayList<CRTEntry>();

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

        CRTEntry entry = new CRTEntry();
        entry.setStartPC(bb.getChar());/*from w  ww  . j  ava 2 s.c om*/
        entry.setEndPC(bb.getChar());
        entry.setStartPos(bb.getInt());
        entry.setEndPos(bb.getInt() + 1);
        entry.setFlags(bb.getChar());

        entries.add(entry);
        lookup.addCRTEntry(entry);

    }

    crt.labelOffsets = new HashMap<Label, CRTEntry>();

    for (Map.Entry<Integer, CRTEntry> entry : lookup.getEntries().entrySet()) {

        int startPC = entry.getValue().getStartPC();
        int endPC = entry.getValue().getEndPC();

        for (int pc = startPC; pc <= endPC; pc++) {

            if (labels[pc] == null) {
                labels[pc] = new Label();
            }
            crt.labelOffsets.put(labels[pc], entry.getValue());
        }
    }

    return crt;
}

From source file:com.seovic.pof.PortableTypeGenerator.java

License:Apache License

private void implementReadExternal() {
    int index = 0;

    MethodNode mn = new MethodNode(ACC_PRIVATE, "readExternal", "(Lcom/tangosol/io/pof/PofReader;)V", null,
            new String[] { "java/io/IOException" });
    mn.visitCode();/*w  w w.j  a  v  a2  s . c  o  m*/

    for (int version : properties.keySet()) {
        mn.visitVarInsn(ALOAD, 1);
        mn.visitMethodInsn(INVOKEINTERFACE, "com/tangosol/io/pof/PofReader", "getVersionId", "()I");
        mn.visitIntInsn(BIPUSH, version);
        Label l = new Label();
        mn.visitJumpInsn(IF_ICMPLT, l);

        SortedSet<FieldNode> fields = properties.get(version);
        for (FieldNode fn : fields) {
            Type type = Type.getType(fn.desc);

            if (isDebugEnabled()) {
                mn.visitLdcInsn("reading attribute " + index + " (" + fn.name + ") from POF stream");
                mn.visitIntInsn(BIPUSH, 7);
                mn.visitMethodInsn(INVOKESTATIC, "com/tangosol/net/CacheFactory", "log",
                        "(Ljava/lang/String;I)V");
            }
            mn.visitVarInsn(ALOAD, 0);
            mn.visitVarInsn(ALOAD, 1);
            mn.visitIntInsn(BIPUSH, index++);

            ReadMethod readMethod = getReadMethod(fn, type);
            readMethod.createTemplate(mn, fn, type);
            mn.visitMethodInsn(INVOKEINTERFACE, "com/tangosol/io/pof/PofReader", readMethod.getName(),
                    readMethod.getDescriptor());
            if (type.getSort() == Type.OBJECT || "readObjectArray".equals(readMethod.getName())) {
                mn.visitTypeInsn(CHECKCAST, type.getInternalName());
            }
            mn.visitFieldInsn(PUTFIELD, cn.name, fn.name, fn.desc);
        }

        mn.visitLabel(l);
        mn.visitFrame(F_SAME, 0, null, 0, null);
    }

    mn.visitInsn(RETURN);
    mn.visitMaxs(0, 0);
    mn.visitEnd();

    if (!hasMethod(mn)) {
        cn.methods.add(mn);
    }
    LOG.debug("Implemented method: " + mn.name);
}

From source file:com.sun.fortress.compiler.asmbytecodeoptimizer.Inlining.java

License:Open Source License

public static List<Insn> convertInsns(MethodInsn mi, List<Insn> insns, int[] args, int _index, Label end) {
    List<Insn> result = new ArrayList<Insn>();
    HashMap labels = new HashMap();
    int index = _index;
    for (Insn i : insns) {
        if (i.isExpanded()) {
            MethodInsn expanded = (MethodInsn) i;
            // This use of end should be OK because all returns should have been removed when inlined before.
            // What could go wrong?
            result.addAll(convertInsns(expanded, expanded.inlineExpansionInsns, args, _index, end));
        } else if (i instanceof SingleInsn) {
            SingleInsn si = (SingleInsn) i;
            switch (si.opcode) {
            case Opcodes.IRETURN:
            case Opcodes.LRETURN:
            case Opcodes.FRETURN:
            case Opcodes.DRETURN:
            case Opcodes.ARETURN:
            case Opcodes.RETURN:
                result.add(new JumpInsn("RETURN->GOTO", Opcodes.GOTO, end, newIndex(mi, index++)));
                break;
            default:
                result.add(i.copy(newIndex(mi, index++)));
            }//from  w ww . jav a  2 s  .  c om
        } else if (i instanceof VarInsn) {
            VarInsn vi = (VarInsn) i;
            switch (vi.opcode) {
            case Opcodes.ILOAD:
            case Opcodes.LLOAD:
            case Opcodes.FLOAD:
            case Opcodes.DLOAD:
            case Opcodes.ALOAD:
            case Opcodes.ISTORE:
            case Opcodes.LSTORE:
            case Opcodes.FSTORE:
            case Opcodes.DSTORE:
            case Opcodes.ASTORE:
                VarInsn newVarInsn = new VarInsn(vi.name, vi.opcode, args[vi.var], newIndex(mi, index++));
                result.add(newVarInsn);
                break;
            default:
                result.add(i.copy(newIndex(mi, index++)));
            }
        } else if (i instanceof VisitMaxs) {
        } else if (i instanceof VisitEnd) {
        } else if (i instanceof VisitCode) {
        } else if (i instanceof VisitFrame) {
        } else if (i instanceof LabelInsn) {
            LabelInsn li = (LabelInsn) i;
            if (labels.containsKey(li.label))
                result.add(new LabelInsn(li.name, (Label) labels.get(li.label), newIndex(mi, index++)));
            else {
                Label l = new Label();
                labels.put(li.label, l);
                result.add(new LabelInsn(li.name, l, newIndex(mi, index++)));
            }
        } else if (i instanceof JumpInsn) {
            JumpInsn ji = (JumpInsn) i;
            if (labels.containsKey(ji.label))
                result.add(
                        new JumpInsn(ji.name, ji.opcode, (Label) labels.get(ji.label), newIndex(mi, index++)));
            else {
                Label l = new Label();
                labels.put(ji.label, l);
                result.add(new JumpInsn(ji.name, ji.opcode, l, newIndex(mi, index++)));
            }
        } else if (i instanceof VisitLineNumberInsn) {
            VisitLineNumberInsn vlni = (VisitLineNumberInsn) i;
            if (labels.containsKey(vlni.start))
                result.add(new VisitLineNumberInsn(vlni.name, vlni.line, (Label) labels.get(vlni.start),
                        newIndex(mi, index++)));
            else {
                Label l = new Label();
                labels.put(vlni.start, l);
                result.add(new VisitLineNumberInsn(vlni.name, vlni.line, l, newIndex(mi, index++)));
            }
        } else if (i instanceof LocalVariableInsn) {
            LocalVariableInsn lvi = (LocalVariableInsn) i;
            if (labels.containsKey(lvi.start) && labels.containsKey(lvi.end)) {
                result.add(new LocalVariableInsn(lvi.name, lvi._name, lvi.desc, lvi.sig,
                        (Label) labels.get(lvi.start), (Label) labels.get(lvi.end), args[lvi._index],
                        newIndex(mi, index++)));
            } else
                throw new RuntimeException("NYI");
        } else if (i instanceof TryCatchBlock) {
            TryCatchBlock tcb = (TryCatchBlock) i;
            if (labels.containsKey(tcb.start) && labels.containsKey(tcb.end)
                    && labels.containsKey(tcb.handler)) {
                result.add(
                        new TryCatchBlock(tcb.name, (Label) labels.get(tcb.start), (Label) labels.get(tcb.end),
                                (Label) labels.get(tcb.handler), tcb.type, newIndex(mi, index++)));
            } else if (!labels.containsKey(tcb.start) && !labels.containsKey(tcb.end)
                    && !labels.containsKey(tcb.handler)) {
                Label s = new Label();
                Label e = new Label();
                Label h = new Label();
                labels.put(tcb.start, s);
                labels.put(tcb.end, e);
                labels.put(tcb.handler, h);
                result.add(new TryCatchBlock(tcb.name, s, e, h, tcb.type, newIndex(mi, index++)));
            } else
                throw new RuntimeException("NYI");
            // Need to add TableSwitch, LookupSwitch
        } else {
            result.add(i.copy(newIndex(mi, index++)));
        }
    }
    return result;
}