Example usage for org.objectweb.asm MethodVisitor visitLabel

List of usage examples for org.objectweb.asm MethodVisitor visitLabel

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Introduction

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

Prototype

public void visitLabel(final Label label)

Source Link

Document

Visits a label.

Usage

From source file:org.apache.s4.core.gen.OverloadDispatcherGenerator.java

License:Apache License

public Class<?> generate() {
    Random rand = new Random(System.currentTimeMillis());
    String dispatcherClassName = "OverloadDispatcher" + (Math.abs(rand.nextInt() % 3256));

    // class headers
    ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
    // CheckClassAdapter cw = new CheckClassAdapter(cw1);
    cw.visit(V1_6, ACC_PUBLIC + ACC_SUPER, dispatcherClassName, null, Type.getInternalName(Object.class),
            new String[] { Type.getInternalName(OverloadDispatcher.class) });

    // constructor
    MethodVisitor mv1 = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
    mv1.visitCode();/*w w  w  .  jav a2  s .  com*/
    Label l0 = new Label();
    mv1.visitLabel(l0);
    mv1.visitVarInsn(ALOAD, 0);
    mv1.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
    Label l1 = new Label();
    mv1.visitLabel(l1);
    mv1.visitInsn(RETURN);
    Label l2 = new Label();
    mv1.visitLabel(l2);
    mv1.visitLocalVariable("this", "Lio/s4/core/" + dispatcherClassName + ";", null, l0, l2, 0);
    mv1.visitMaxs(1, 1);

    mv1.visitEnd();

    // dispatch input events method
    generateEventDispatchMethod(cw, "dispatchEvent", inputEventHierarchies, "onEvent");
    // dispatch output events method
    generateEventDispatchMethod(cw, "dispatchTrigger", outputEventHierarchies, "onTrigger");

    cw.visitEnd();

    if (DUMP) {
        try {
            LoggerFactory.getLogger(getClass())
                    .debug("Dumping generated overload dispatcher class for PE of class [" + targetClass + "]");
            Files.write(cw.toByteArray(),
                    new File(System.getProperty("java.io.tmpdir") + "/" + dispatcherClassName + ".class"));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return new OverloadDispatcherClassLoader(targetClass.getClassLoader())
            .loadClassFromBytes(dispatcherClassName, cw.toByteArray());

}

From source file:org.apache.s4.core.gen.OverloadDispatcherGenerator.java

License:Apache License

private void generateEventDispatchMethod(ClassWriter cw, String dispatchMethodName,
        List<Hierarchy> eventHierarchies, String processEventMethodName) {
    MethodVisitor mv2 = cw.visitMethod(ACC_PUBLIC, dispatchMethodName,
            "(" + Type.getType(ProcessingElement.class).getDescriptor()
                    + Type.getType(Event.class).getDescriptor() + ")V",
            null, null);/*from  w  w w .  java 2  s .  c  o m*/
    mv2.visitCode();
    Label l3 = new Label();
    mv2.visitLabel(l3);
    mv2.visitVarInsn(ALOAD, 1);
    mv2.visitTypeInsn(CHECKCAST, Type.getInternalName(targetClass));
    mv2.visitVarInsn(ASTORE, 3);
    boolean first = true;
    Label aroundLabel = new Label();
    for (Hierarchy hierarchy : eventHierarchies) {
        if (first) {
            Label l4 = new Label();
            mv2.visitLabel(l4);
        }
        mv2.visitVarInsn(ALOAD, 2);
        mv2.visitTypeInsn(INSTANCEOF, Type.getInternalName(hierarchy.getTop()));

        Label l5 = new Label();
        mv2.visitJumpInsn(IFEQ, l5);

        Label l6 = new Label();
        mv2.visitLabel(l6);
        mv2.visitVarInsn(ALOAD, 3);
        mv2.visitVarInsn(ALOAD, 2);
        mv2.visitTypeInsn(CHECKCAST, Type.getInternalName(hierarchy.getTop()));
        mv2.visitMethodInsn(INVOKEVIRTUAL, Type.getInternalName(targetClass), processEventMethodName,
                "(" + Type.getDescriptor(hierarchy.getTop()) + ")V");
        mv2.visitJumpInsn(Opcodes.GOTO, aroundLabel);
        mv2.visitLabel(l5);

        if (first) {
            mv2.visitFrame(F_APPEND, 1, new Object[] { Type.getInternalName(targetClass) }, 0, null);
            first = false;
        } else {
            mv2.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
        }
    }
    addErrorLogStatement(mv2);
    if (eventHierarchies.size() > 0) {
        mv2.visitLabel(aroundLabel);
        mv2.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
    }
    mv2.visitInsn(RETURN);
    Label l8 = new Label();
    mv2.visitLabel(l8);
    mv2.visitLocalVariable("pe", Type.getDescriptor(ProcessingElement.class), null, l3, l8, 1);
    mv2.visitLocalVariable("event", Type.getDescriptor(Event.class), null, l3, l8, 2);
    mv2.visitLocalVariable("typedPE", Type.getDescriptor(targetClass), null, l3, l8, 3);
    mv2.visitMaxs(4, 4);
    mv2.visitEnd();
}

From source file:org.apache.tuscany.sca.interfacedef.java.jaxrs.RootResourceClassGenerator.java

License:Apache License

private static void declareConstructor(ClassWriter cw, String className) {
    MethodVisitor mv;
    mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
    mv.visitCode();//from   w ww  .j a v a  2  s .c  o  m
    Label l0 = new Label();
    mv.visitLabel(l0);
    // mv.visitLineNumber(37, l0);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
    mv.visitInsn(RETURN);
    Label l1 = new Label();
    mv.visitLabel(l1);
    mv.visitLocalVariable("this", getSignature(className), null, l0, l1, 0);
    mv.visitMaxs(1, 1);
    mv.visitEnd();
}

From source file:org.apache.tuscany.sca.interfacedef.java.jaxws.BaseBeanGenerator.java

License:Apache License

protected void declareSetter(ClassWriter cw, String classDescriptor, String classSignature, String propName,
        String propClassSignature, String propTypeSignature) {
    if ("Ljava/util/List;".equals(propClassSignature)) {
        return;//  w ww. j a  v a2  s. co  m
    }
    MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "set" + capitalize(propName), "(" + propClassSignature + ")V",
            propTypeSignature == null ? null : "(" + propTypeSignature + ")V", null);
    mv.visitCode();
    Label l0 = new Label();
    mv.visitLabel(l0);
    // mv.visitLineNumber(57, l0);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitVarInsn(CodeGenerationHelper.getLoadOPCode(propClassSignature), 1);
    mv.visitFieldInsn(PUTFIELD, classDescriptor, getFieldName(propName), propClassSignature);
    Label l1 = new Label();
    mv.visitLabel(l1);
    // mv.visitLineNumber(58, l1);
    mv.visitInsn(RETURN);
    Label l2 = new Label();
    mv.visitLabel(l2);
    mv.visitLocalVariable("this", classSignature, null, l0, l2, 0);
    mv.visitLocalVariable(getFieldName(propName), propClassSignature, propTypeSignature, l0, l2, 1);
    mv.visitMaxs(3, 3);
    mv.visitEnd();

}

From source file:org.apache.tuscany.sca.interfacedef.java.jaxws.BaseBeanGenerator.java

License:Apache License

protected void decalreGetter(ClassWriter cw, String classDescriptor, String classSignature, String propName,
        String propClassSignature, String propTypeSignature) {
    String collectionImplClass = COLLECTION_CLASSES.get(propClassSignature);
    if (collectionImplClass != null) {
        decalreCollectionGetter(cw, classDescriptor, classSignature, propName, propClassSignature,
                propTypeSignature, collectionImplClass);
        return;//  w  w  w  . j  av  a2s  . c  o m
    }

    String getterName = ("Z".equals(propClassSignature) ? "is" : "get") + capitalize(propName);
    MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, getterName, "()" + propClassSignature,
            propTypeSignature == null ? null : "()" + propTypeSignature, null);
    mv.visitCode();
    Label l0 = new Label();
    mv.visitLabel(l0);
    // mv.visitLineNumber(48, l0);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, classDescriptor, getFieldName(propName), propClassSignature);
    mv.visitInsn(CodeGenerationHelper.getReturnOPCode(propClassSignature));
    Label l1 = new Label();
    mv.visitLabel(l1);
    mv.visitLocalVariable("this", classSignature, null, l0, l1, 0);
    mv.visitMaxs(2, 1);
    mv.visitEnd();
}

From source file:org.apache.tuscany.sca.interfacedef.java.jaxws.BaseBeanGenerator.java

License:Apache License

protected void decalreCollectionGetter(ClassWriter cw, String classDescriptor, String classSignature,
        String propName, String propClassSignature, String propTypeSignature, String collectionImplClass) {
    String getterName = "get" + capitalize(propName);
    String fieldName = getFieldName(propName);
    MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, getterName, "()" + propClassSignature,
            propTypeSignature == null ? null : "()" + propTypeSignature, null);
    mv.visitCode();/*  w w w.jav  a2 s .  co  m*/
    Label l0 = new Label();
    mv.visitLabel(l0);
    mv.visitLineNumber(63, l0);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, classDescriptor, fieldName, propClassSignature);
    Label l1 = new Label();
    mv.visitJumpInsn(IFNONNULL, l1);
    Label l2 = new Label();
    mv.visitLabel(l2);
    mv.visitLineNumber(64, l2);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitTypeInsn(NEW, collectionImplClass);
    mv.visitInsn(DUP);
    mv.visitMethodInsn(INVOKESPECIAL, collectionImplClass, "<init>", "()V");
    mv.visitFieldInsn(PUTFIELD, classDescriptor, fieldName, propClassSignature);
    mv.visitLabel(l1);
    mv.visitLineNumber(66, l1);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, classDescriptor, fieldName, propClassSignature);
    mv.visitInsn(ARETURN);
    Label l3 = new Label();
    mv.visitLabel(l3);
    mv.visitLocalVariable("this", classSignature, null, l0, l3, 0);
    mv.visitMaxs(3, 1);
    mv.visitEnd();
}

From source file:org.apache.tuscany.sca.interfacedef.java.jaxws.BaseBeanGenerator.java

License:Apache License

protected void declareConstructor(ClassWriter cw, String classSignature) {
    MethodVisitor mv;
    mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
    mv.visitCode();//w w  w .ja  v  a 2  s.  c  o m
    Label l0 = new Label();
    mv.visitLabel(l0);
    // mv.visitLineNumber(37, l0);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
    mv.visitInsn(RETURN);
    Label l1 = new Label();
    mv.visitLabel(l1);
    mv.visitLocalVariable("this", classSignature, null, l0, l1, 0);
    mv.visitMaxs(1, 1);
    mv.visitEnd();
}

From source file:org.ballerinalang.nativeimpl.jvm.methodvisitor.VisitLabel.java

License:Open Source License

public static void visitLabel(Strand strand, ObjectValue oMv, ObjectValue oLabel) {
    MethodVisitor mv = ASMUtil.getRefArgumentNativeData(oMv);
    Label label = ASMUtil.getRefArgumentNativeData(oLabel);
    mv.visitLabel(label);
}

From source file:org.batoo.jpa.core.impl.instance.Enhancer.java

License:Open Source License

private static void createContainerConstructor(final String enhancingClassName, final String enhancedClassName,
        final String descEnhancer, final ClassWriter cw) {
    final MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC, Enhancer.CONSTRUCTOR_INIT,
            Enhancer.makeDescription(Void.TYPE, Class.class, SessionImpl.class, Object.class, Boolean.TYPE),
            null, null);//from ww  w  .j a v a2s .  c o m
    mv.visitCode();

    final Label l0 = new Label();
    mv.visitLabel(l0);
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitMethodInsn(Opcodes.INVOKESPECIAL, enhancingClassName, Enhancer.CONSTRUCTOR_INIT,
            Enhancer.makeDescription(Void.TYPE));

    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitVarInsn(Opcodes.ALOAD, 1);
    mv.visitFieldInsn(Opcodes.PUTFIELD, enhancedClassName, Enhancer.FIELD_ENHANCED_TYPE,
            Enhancer.DESCRIPTOR_CLASS);

    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitVarInsn(Opcodes.ALOAD, 2);
    mv.visitFieldInsn(Opcodes.PUTFIELD, enhancedClassName, Enhancer.FIELD_ENHANCED_SESSION,
            Enhancer.DESCRIPTOR_SESSION);

    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitVarInsn(Opcodes.ALOAD, 3);
    mv.visitFieldInsn(Opcodes.PUTFIELD, enhancedClassName, Enhancer.FIELD_ENHANCED_ID,
            Enhancer.DESCRIPTOR_OBJECT);

    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitVarInsn(Opcodes.ILOAD, 4);
    mv.visitFieldInsn(Opcodes.PUTFIELD, enhancedClassName, Enhancer.FIELD_ENHANCED_INITIALIZED,
            Enhancer.DESCRIPTOR_BOOLEAN);

    mv.visitInsn(Opcodes.RETURN);

    final Label l1 = new Label();
    mv.visitLabel(l1);
    mv.visitLocalVariable(Enhancer.THIS, descEnhancer, null, l0, l1, 0);
    mv.visitLocalVariable("type", Enhancer.DESCRIPTOR_CLASS, null, l0, l1, 1);
    mv.visitLocalVariable("session", Enhancer.DESCRIPTOR_SESSION, null, l0, l1, 2);
    mv.visitLocalVariable("id", Enhancer.DESCRIPTOR_OBJECT, null, l0, l1, 3);
    mv.visitLocalVariable("initialized", Enhancer.DESCRIPTOR_BOOLEAN, null, l0, l1, 4);
    mv.visitMaxs(0, 0);

    mv.visitEnd();
}

From source file:org.batoo.jpa.core.impl.instance.Enhancer.java

License:Open Source License

private static void createMethodCheck(final String enhancedClassName, final String descEnhancer,
        final ClassWriter cw) {
    final MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PRIVATE, Enhancer.METHOD_ENHANCED_CHECK,
            Enhancer.makeDescription(Void.TYPE), null, null);
    mv.visitCode();/*from   w ww.  j  av  a  2 s.c  om*/

    final Label lCheckInternal = new Label();
    final Label lCheckInitialized = new Label();
    final Label lReturn = new Label();
    final Label lFind = new Label();
    final Label lInitialized = new Label();
    final Label lChanged = new Label();
    final Label lOut = new Label();

    // if (!this.__enhanced__$$__internal) { return }
    mv.visitLabel(lCheckInternal);
    mv.visitFrame(Opcodes.F_NEW, 1, new Object[] { enhancedClassName }, 0, new Object[] {});
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitFieldInsn(Opcodes.GETFIELD, enhancedClassName, Enhancer.FIELD_ENHANCED_INTERNAL,
            Enhancer.DESCRIPTOR_BOOLEAN);
    mv.visitJumpInsn(Opcodes.IFEQ, lCheckInitialized);
    mv.visitInsn(Opcodes.RETURN);

    // if (!this.__enhanced__$$__initialized) {
    mv.visitLabel(lCheckInitialized);
    mv.visitFrame(Opcodes.F_NEW, 1, new Object[] { enhancedClassName }, 0, new Object[] {});
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitFieldInsn(Opcodes.GETFIELD, enhancedClassName, Enhancer.FIELD_ENHANCED_INITIALIZED,
            Enhancer.DESCRIPTOR_BOOLEAN);
    mv.visitJumpInsn(Opcodes.IFNE, lChanged);

    //     if (this.__enhanced_$$__session == null)
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitFieldInsn(Opcodes.GETFIELD, enhancedClassName, Enhancer.FIELD_ENHANCED_SESSION,
            Enhancer.DESCRIPTOR_SESSION);
    mv.visitJumpInsn(Opcodes.IFNONNULL, lFind);

    //         throw new PersistenceException("No session to initialize the instance");
    mv.visitTypeInsn(Opcodes.NEW, Enhancer.INTERNAL_PERSISTENCE_EXCEPTION);
    mv.visitInsn(Opcodes.DUP);
    mv.visitLdcInsn("No session to initialize the instance");
    mv.visitMethodInsn(Opcodes.INVOKESPECIAL, Enhancer.INTERNAL_PERSISTENCE_EXCEPTION,
            Enhancer.CONSTRUCTOR_INIT, Enhancer.makeDescription(Void.TYPE, String.class));
    mv.visitInsn(Opcodes.ATHROW);

    //       this.__enhanced_$$__session.getEntityManager().find(this.__enhanced_$$__type, this.__enhanced__$$__id);
    mv.visitLabel(lFind);
    mv.visitFrame(Opcodes.F_NEW, 1, new Object[] { enhancedClassName }, 0, new Object[] {});
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitFieldInsn(Opcodes.GETFIELD, enhancedClassName, Enhancer.FIELD_ENHANCED_SESSION,
            Enhancer.DESCRIPTOR_SESSION);
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Enhancer.INTERNAL_SESSION, Enhancer.METHOD_GET_ENTITY_MANAGER,
            Enhancer.makeDescription(EntityManagerImpl.class));
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitFieldInsn(Opcodes.GETFIELD, enhancedClassName, Enhancer.FIELD_ENHANCED_TYPE,
            Enhancer.DESCRIPTOR_CLASS);
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitFieldInsn(Opcodes.GETFIELD, enhancedClassName, Enhancer.FIELD_ENHANCED_ID,
            Enhancer.DESCRIPTOR_OBJECT);
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Enhancer.INTERNAL_ENTITY_MANAGER, Enhancer.METHOD_FIND,
            Enhancer.makeDescription(Object.class, Class.class, Object.class));
    mv.visitInsn(Opcodes.POP);

    //   this.__enhanced__$$__initialized = true;
    mv.visitLabel(lInitialized);
    mv.visitFrame(Opcodes.F_NEW, 1, new Object[] { enhancedClassName }, 0, new Object[] {});
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitInsn(Opcodes.ICONST_1);
    mv.visitFieldInsn(Opcodes.PUTFIELD, enhancedClassName, Enhancer.FIELD_ENHANCED_INITIALIZED,
            Enhancer.DESCRIPTOR_BOOLEAN);

    // if (this.__enhanced_$$__session != null)
    mv.visitLabel(lChanged);
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitFieldInsn(Opcodes.GETFIELD, enhancedClassName, Enhancer.FIELD_ENHANCED_SESSION,
            Enhancer.DESCRIPTOR_SESSION);
    mv.visitJumpInsn(Opcodes.IFNULL, lReturn);

    //     this.__enhanced__$$__managedInstance.changed();
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitFieldInsn(Opcodes.GETFIELD, enhancedClassName, Enhancer.FIELD_ENHANCED_MANAGED_INSTANCE,
            Enhancer.DESCRIPTOR_MANAGED_INSTANCE);
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Enhancer.INTERNAL_MANAGED_INSTANCE, Enhancer.METHOD_CHANGED,
            Enhancer.makeDescription(Void.TYPE));

    // return;
    mv.visitLabel(lReturn);
    mv.visitFrame(Opcodes.F_NEW, 1, new Object[] { enhancedClassName }, 0, new Object[] {});
    mv.visitInsn(Opcodes.RETURN);

    mv.visitLabel(lOut);
    mv.visitLocalVariable(Enhancer.THIS, descEnhancer, null, lCheckInternal, lOut, 0);
    mv.visitMaxs(0, 0);
    mv.visitEnd();
}