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:ldapbeans.bean.LdapBeanClassManager.java

License:LGPL

/**
 * Generate code to convert ldapAttribute witch is on the to of the stack to
 * Boolean/*  ww  w .j  ava2  s. co  m*/
 * 
 * @param p_MethodVisitor
 *            The {@link MethodVisitor} of the generated method
 * @param p_ClassName
 *            Name of the generated class
 * @param p_LdapAttribute
 *            The LdapAttribute that will be used for generating the method
 * @param p_ReturnType
 *            The type of the result
 * @param p_Object
 *            Index of the object to convert on the stack
 * @param p_Result
 *            Index of the converted object on the stack
 */
private void generateConvertToBoolean(MethodVisitor p_MethodVisitor, String p_ClassName,
        LdapAttribute p_LdapAttribute, Class<?> p_ReturnType, int p_Object, int p_Result) {
    MethodVisitor mv = p_MethodVisitor;
    Label l0 = new Label();
    // return true or false instead of result
    generateConvertToBoolean(mv, p_ReturnType, p_LdapAttribute.trueValue(), true, p_Object, p_Result, l0);
    generateConvertToBoolean(mv, p_ReturnType, p_LdapAttribute.falseValue(), false, p_Object, p_Result, l0);
    // Can't convert attribute to boolean
    // throw new IllegalArgumentException(object +
    // " cannot be converted into boolean");
    mv.visitTypeInsn(NEW, "java/lang/IllegalArgumentException");
    mv.visitInsn(DUP);
    mv.visitTypeInsn(NEW, "java/lang/StringBuilder");
    mv.visitInsn(DUP);
    mv.visitMethodInsn(INVOKESPECIAL, "java/lang/StringBuilder", "<init>", "()V");
    mv.visitVarInsn(ALOAD, p_Object);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append",
            "(Ljava/lang/Object;)Ljava/lang/StringBuilder;");
    mv.visitLdcInsn(" cannot be converted into boolean");
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append",
            "(Ljava/lang/String;)Ljava/lang/StringBuilder;");
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "toString", "()Ljava/lang/String;");
    mv.visitMethodInsn(INVOKESPECIAL, "java/lang/IllegalArgumentException", "<init>", "(Ljava/lang/String;)V");
    mv.visitInsn(ATHROW);
    mv.visitLabel(l0);
}

From source file:ldapbeans.bean.LdapBeanClassManager.java

License:LGPL

/**
 * Generate code to convert ldapAttribute witch is on the to of the stack to
 * Boolean//from w  w w.jav  a  2  s.  c  o  m
 * 
 * @param p_MethodVisitor
 *            The {@link MethodVisitor} of the generated method
 * @param p_ReturnType
 *            The type of the result
 * @param p_BValues
 *            Possible values for the attribute
 * @param p_BValue
 *            Boolean value
 * @param p_Object
 *            Index of the object to convert on the stack
 * @param p_Result
 *            Index of the converted object on the stack
 * @param p_End
 *            Destination if the conversion success
 */
private void generateConvertToBoolean(MethodVisitor p_MethodVisitor, Class<?> p_ReturnType, String[] p_BValues,
        boolean p_BValue, int p_Object, int p_Result, Label p_End) {
    MethodVisitor mv = p_MethodVisitor;
    {
        // if(trueValue.equals(result))
        Label l0 = new Label();
        for (String bValue : p_BValues) {
            mv.visitLdcInsn(bValue);
            mv.visitVarInsn(ALOAD, p_Object);
            mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Object", "toString", "()Ljava/lang/String;");
            mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "equalsIgnoreCase", "(Ljava/lang/String;)Z");
            mv.visitJumpInsn(IFNE, l0);
        }
        Label l1 = new Label();
        mv.visitJumpInsn(GOTO, l1);
        // {
        mv.visitLabel(l0);
        if (boolean.class.equals(p_ReturnType)) {
            // return true|false;
            mv.visitInsn(p_BValue ? ICONST_1 : ICONST_0);
            mv.visitVarInsn(ISTORE, p_Result);
        } else {
            // return Boolean.TRUE|Boolean.FALSE;
            mv.visitFieldInsn(GETSTATIC, "java/lang/Boolean", p_BValue ? "TRUE" : "FALSE",
                    "Ljava/lang/Boolean;");
            mv.visitVarInsn(ASTORE, p_Result);
        }
        mv.visitJumpInsn(GOTO, p_End);
        // }
        mv.visitLabel(l1);
    }
}

From source file:lombok.patcher.scripts.SetSymbolDuringMethodCallScript.java

License:Open Source License

private void makeWrapperMethod(ClassVisitor cv, WrapperMethodDescriptor wmd) {
    MethodVisitor mv = cv.visitMethod(Opcodes.ACC_SYNTHETIC | Opcodes.ACC_PRIVATE | Opcodes.ACC_STATIC,
            wmd.getWrapperName(), wmd.getWrapperDescriptor(), null, null);

    MethodLogistics logistics = new MethodLogistics(Opcodes.ACC_STATIC, wmd.getWrapperDescriptor());

    mv.visitCode();//from w w  w.  j a  va  2  s .  c  o m
    Label start = new Label();
    Label end = new Label();
    Label handler = new Label();
    mv.visitTryCatchBlock(start, end, handler, null);
    mv.visitLabel(start);
    mv.visitLdcInsn(symbol);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, "lombok/patcher/Symbols", "push", "(Ljava/lang/String;)V", false);
    for (int i = 0; i < logistics.getParamCount(); i++) {
        logistics.generateLoadOpcodeForParam(i, mv);
    }
    mv.visitMethodInsn(wmd.getOpcode(), wmd.getOwner(), wmd.getName(), wmd.getTargetDescriptor(), wmd.isItf());
    mv.visitLabel(end);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, "lombok/patcher/Symbols", "pop", "()V", false);
    logistics.generateReturnOpcode(mv);
    mv.visitLabel(handler);
    mv.visitFrame(Opcodes.F_FULL, 0, null, 1, new Object[] { "java/lang/Throwable" });
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, "lombok/patcher/Symbols", "pop", "()V", false);
    mv.visitInsn(Opcodes.ATHROW);
    mv.visitMaxs(Math.max(1, logistics.getParamCount()), logistics.getParamCount());
    mv.visitEnd();
}

From source file:me.rojo8399.placeholderapi.impl.placeholder.gen.ClassPlaceholderFactory.java

License:Open Source License

private static void nullCheck(MethodVisitor mv, boolean nullable, Consumer<MethodVisitor> success,
        boolean throwError) {
    if (nullable) {
        return;//  w ww. j  a  v  a2s.  c o  m
    }
    // assume null check obj already loaded to stack
    Label no = new Label();
    mv.visitJumpInsn(IFNONNULL, no);
    if (throwError) {
        mv.visitTypeInsn(Opcodes.NEW, Type.getInternalName(NoValueException.class));
        mv.visitVarInsn(ASTORE, 7);
        mv.visitVarInsn(ALOAD, 7);
        mv.visitMethodInsn(Opcodes.INVOKESPECIAL, Type.getInternalName(NoValueException.class), "<init>", "()V",
                false);
        mv.visitVarInsn(ALOAD, 7);
        mv.visitInsn(Opcodes.ATHROW);
    } else {
        mv.visitInsn(ACONST_NULL);
        mv.visitInsn(ARETURN);
    }
    mv.visitLabel(no);
    success.accept(mv);
}

From source file:me.rojo8399.placeholderapi.impl.placeholder.gen.ClassPlaceholderFactory.java

License:Open Source License

private static void skipIfNull(MethodVisitor mv, Consumer<MethodVisitor> success) {
    // assume null check obj already loaded to stack
    Label no = new Label();
    mv.visitJumpInsn(IFNULL, no);//from w ww .  jav a2s .c  om
    success.accept(mv);
    mv.visitLabel(no);
}

From source file:me.rojo8399.placeholderapi.impl.placeholder.gen.ClassPlaceholderFactory.java

License:Open Source License

private static void tryCatch(MethodVisitor mv, Consumer<MethodVisitor> t, Consumer<MethodVisitor> c) {
    Label st = new Label(), et = new Label(), sc = new Label(), ec = new Label();
    mv.visitTryCatchBlock(st, et, sc, "java/lang/Exception");
    mv.visitLabel(st);
    t.accept(mv);// w  w w.  j a v a 2s  .  c  om
    mv.visitLabel(et);
    mv.visitJumpInsn(GOTO, ec);
    mv.visitLabel(sc);
    c.accept(mv);
    mv.visitLabel(ec);
}

From source file:mt.swift.Deserializer.java

License:Apache License

private void compileDeserializeMethod(StructureType type, ClassVisitor writer, String targetClassName,
        Class targetClass) {/*from   www.  j av  a2 s  . com*/
    MethodVisitor methodVisitor = writer.visitMethod(
            ACC_PUBLIC, "deserialize", "(L" + Util.getInternalName(Deserializer.class)
                    + ";Lcom/facebook/thrift/protocol/TProtocol;)L" + targetClassName + ";",
            null, new String[] { "com/facebook/thrift/TException" });

    FrameRegisterManager context = new FrameRegisterManager();
    context.bindSlot("this", 0);
    context.bindSlot("deserializer", 1);
    context.bindSlot("protocol", 2);
    context.newSlot("target");
    context.newSlot("tfield");

    methodVisitor.visitCode();

    // <target> result = new <target>()
    methodVisitor.visitTypeInsn(NEW, targetClassName);
    methodVisitor.visitInsn(DUP);
    methodVisitor.visitMethodInsn(INVOKESPECIAL, targetClassName, "<init>", "()V");
    methodVisitor.visitVarInsn(ASTORE, context.getSlot("target"));

    // protocol.readStructBegin()
    methodVisitor.visitVarInsn(ALOAD, context.getSlot("protocol"));
    methodVisitor.visitMethodInsn(INVOKEVIRTUAL, "com/facebook/thrift/protocol/TProtocol", "readStructBegin",
            "()Lcom/facebook/thrift/protocol/TStruct;");
    methodVisitor.visitInsn(POP); // discard return value

    // while (true)
    Label whileLabel = new Label();
    methodVisitor.visitLabel(whileLabel);

    // TField tfield = protocol.readFieldBegin()
    methodVisitor.visitVarInsn(ALOAD, context.getSlot("protocol"));
    methodVisitor.visitMethodInsn(INVOKEVIRTUAL, "com/facebook/thrift/protocol/TProtocol", "readFieldBegin",
            "()Lcom/facebook/thrift/protocol/TField;");
    methodVisitor.visitVarInsn(ASTORE, context.getSlot("tfield"));

    // tfield.type
    methodVisitor.visitVarInsn(ALOAD, context.getSlot("tfield"));
    methodVisitor.visitFieldInsn(GETFIELD, "com/facebook/thrift/protocol/TField", "type", "B");

    methodVisitor.visitFieldInsn(GETSTATIC, "com/facebook/thrift/protocol/TType", "STOP", "B");

    // if (tfield.type == TType.STOP) { break; }
    Label endWhile = new Label();
    methodVisitor.visitJumpInsn(IF_ICMPEQ, endWhile);

    // tfield.id
    methodVisitor.visitVarInsn(ALOAD, context.getSlot("tfield"));
    methodVisitor.visitFieldInsn(GETFIELD, "com/facebook/thrift/protocol/TField", "id", "S");

    List<Field> fields = new ArrayList<Field>(type.getFields());
    int[] ids = new int[fields.size()];
    Label[] labels = new Label[fields.size()];
    for (int i = 0; i < fields.size(); ++i) {
        ids[i] = fields.get(i).getId();
        labels[i] = new Label();
    }

    Label fieldSkipped = new Label();

    methodVisitor.visitLookupSwitchInsn(fieldSkipped, ids, labels);

    for (int i = 0; i < fields.size(); ++i) {
        Field field = fields.get(i);

        methodVisitor.visitLabel(labels[i]);

        // if (tfield.type == ###)
        methodVisitor.visitVarInsn(ALOAD, context.getSlot("tfield"));
        methodVisitor.visitFieldInsn(GETFIELD, "com/facebook/thrift/protocol/TField", "type", "B");
        methodVisitor.visitIntInsn(BIPUSH, field.getType().getTType());
        methodVisitor.visitJumpInsn(IF_ICMPNE, fieldSkipped);

        methodVisitor.visitVarInsn(ALOAD, context.getSlot("target"));
        if (Map.class.isAssignableFrom(targetClass)) {
            methodVisitor.visitLdcInsn(field.getName());
            generateReadElement(methodVisitor, context, field.getType());
            generateAddToMap(targetClassName, methodVisitor, context, field);
        } else {
            generateReadElement(methodVisitor, context, field.getType());
            generateSetTargetField(targetClassName, methodVisitor, context, field);
        }

        methodVisitor.visitJumpInsn(GOTO, whileLabel);
    }

    methodVisitor.visitLabel(fieldSkipped);
    methodVisitor.visitVarInsn(ALOAD, context.getSlot("protocol"));
    methodVisitor.visitVarInsn(ALOAD, context.getSlot("tfield"));
    methodVisitor.visitFieldInsn(GETFIELD, "com/facebook/thrift/protocol/TField", "type", "B");
    methodVisitor.visitMethodInsn(INVOKESTATIC, "com/facebook/thrift/protocol/TProtocolUtil", "skip",
            "(Lcom/facebook/thrift/protocol/TProtocol;B)V");

    // end while
    methodVisitor.visitJumpInsn(GOTO, whileLabel);

    methodVisitor.visitLabel(endWhile);

    // protocol.readStructEnd()
    methodVisitor.visitVarInsn(ALOAD, context.getSlot("protocol"));
    methodVisitor.visitMethodInsn(INVOKEVIRTUAL, "com/facebook/thrift/protocol/TProtocol", "readStructEnd",
            "()V");

    // return result
    methodVisitor.visitVarInsn(ALOAD, context.getSlot("target"));
    methodVisitor.visitInsn(ARETURN);

    methodVisitor.visitMaxs(1, 1); // TODO: what should these be?
    methodVisitor.visitEnd();
}

From source file:mt.swift.Deserializer.java

License:Apache License

private void generateReadList(MethodVisitor methodVisitor, FrameRegisterManager context, ListType listType) {
    // protocol.readListBegin()
    int tlistSizeLocal = context.newAnonymousSlot();
    int loopCounterLocal = context.newAnonymousSlot();

    methodVisitor.visitVarInsn(ALOAD, context.getSlot("protocol"));
    methodVisitor.visitMethodInsn(INVOKEVIRTUAL, "com/facebook/thrift/protocol/TProtocol", "readListBegin",
            "()Lcom/facebook/thrift/protocol/TList;");
    methodVisitor.visitFieldInsn(GETFIELD, "com/facebook/thrift/protocol/TList", "size", "I");
    methodVisitor.visitVarInsn(ISTORE, tlistSizeLocal);

    // result = new ArrayList(tlist.size)
    methodVisitor.visitTypeInsn(NEW, "java/util/ArrayList");
    methodVisitor.visitInsn(DUP);//from  w  ww .ja  v a2 s.c o  m
    methodVisitor.visitVarInsn(ILOAD, tlistSizeLocal);
    methodVisitor.visitMethodInsn(INVOKESPECIAL, "java/util/ArrayList", "<init>", "(I)V");

    // i = 0
    methodVisitor.visitInsn(ICONST_0);
    methodVisitor.visitVarInsn(ISTORE, loopCounterLocal); // #4 = loop counter

    Label done = new Label();
    Label loop = new Label();
    methodVisitor.visitLabel(loop);
    methodVisitor.visitVarInsn(ILOAD, loopCounterLocal);
    methodVisitor.visitVarInsn(ILOAD, tlistSizeLocal);
    methodVisitor.visitJumpInsn(IF_ICMPGE, done);

    methodVisitor.visitInsn(DUP); // ArrayList

    generateReadElement(methodVisitor, context, listType.getValueType());
    generateConvertToObject(methodVisitor, listType.getValueType());

    // entry is left on stack(0). Add to list
    methodVisitor.visitMethodInsn(INVOKEVIRTUAL, "java/util/ArrayList", "add", "(Ljava/lang/Object;)Z");
    methodVisitor.visitInsn(POP);

    methodVisitor.visitIincInsn(loopCounterLocal, 1);
    methodVisitor.visitJumpInsn(GOTO, loop);

    methodVisitor.visitLabel(done);
    methodVisitor.visitVarInsn(ALOAD, context.getSlot("protocol"));
    methodVisitor.visitMethodInsn(INVOKEVIRTUAL, "com/facebook/thrift/protocol/TProtocol", "readListEnd",
            "()V");

    context.release(tlistSizeLocal);
    context.release(loopCounterLocal);
}

From source file:mt.swift.Deserializer.java

License:Apache License

private void generateReadSet(MethodVisitor methodVisitor, FrameRegisterManager context, SetType type) {
    // protocol.readListBegin()
    int tsetSizeLocal = context.newAnonymousSlot();
    int loopCounterLocal = context.newAnonymousSlot();

    methodVisitor.visitVarInsn(ALOAD, context.getSlot("protocol"));
    methodVisitor.visitMethodInsn(INVOKEVIRTUAL, "com/facebook/thrift/protocol/TProtocol", "readSetBegin",
            "()Lcom/facebook/thrift/protocol/TSet;");
    methodVisitor.visitFieldInsn(GETFIELD, "com/facebook/thrift/protocol/TSet", "size", "I");
    methodVisitor.visitVarInsn(ISTORE, tsetSizeLocal);

    // result = new ArrayList(tlist.size)
    methodVisitor.visitTypeInsn(NEW, "java/util/HashSet");
    methodVisitor.visitInsn(DUP);/*from   w  w  w  .  jav a  2 s . c om*/
    methodVisitor.visitVarInsn(ILOAD, tsetSizeLocal);
    methodVisitor.visitMethodInsn(INVOKESPECIAL, "java/util/HashSet", "<init>", "(I)V");

    // i = 0
    methodVisitor.visitInsn(ICONST_0);
    methodVisitor.visitVarInsn(ISTORE, loopCounterLocal); // #4 = loop counter

    Label done = new Label();
    Label loop = new Label();
    methodVisitor.visitLabel(loop);
    methodVisitor.visitVarInsn(ILOAD, loopCounterLocal);
    methodVisitor.visitVarInsn(ILOAD, tsetSizeLocal);
    methodVisitor.visitJumpInsn(IF_ICMPGE, done);

    methodVisitor.visitInsn(DUP); // ArrayList

    generateReadElement(methodVisitor, context, type.getValueType());
    generateConvertToObject(methodVisitor, type.getValueType());

    // entry is left on stack(0). Add to list
    methodVisitor.visitMethodInsn(INVOKEVIRTUAL, "java/util/HashSet", "add", "(Ljava/lang/Object;)Z");
    methodVisitor.visitInsn(POP);

    methodVisitor.visitIincInsn(loopCounterLocal, 1);
    methodVisitor.visitJumpInsn(GOTO, loop);

    methodVisitor.visitLabel(done);
    methodVisitor.visitVarInsn(ALOAD, context.getSlot("protocol"));
    methodVisitor.visitMethodInsn(INVOKEVIRTUAL, "com/facebook/thrift/protocol/TProtocol", "readSetEnd", "()V");

    context.release(tsetSizeLocal);
    context.release(loopCounterLocal);
}

From source file:mt.swift.Deserializer.java

License:Apache License

private void generateReadMap(MethodVisitor methodVisitor, FrameRegisterManager context, MapType type) {
    // protocol.readListBegin()
    int tmapSizeLocal = context.newAnonymousSlot();
    int loopCounterLocal = context.newAnonymousSlot();

    methodVisitor.visitVarInsn(ALOAD, context.getSlot("protocol"));
    methodVisitor.visitMethodInsn(INVOKEVIRTUAL, "com/facebook/thrift/protocol/TProtocol", "readMapBegin",
            "()Lcom/facebook/thrift/protocol/TMap;");
    methodVisitor.visitFieldInsn(GETFIELD, "com/facebook/thrift/protocol/TMap", "size", "I");
    methodVisitor.visitVarInsn(ISTORE, tmapSizeLocal);

    // result = new ArrayList(tlist.size)
    methodVisitor.visitTypeInsn(NEW, "java/util/LinkedHashMap");
    methodVisitor.visitInsn(DUP);/*from w  ww .  j  a va 2  s  . c  o m*/
    methodVisitor.visitVarInsn(ILOAD, tmapSizeLocal);
    methodVisitor.visitInsn(ICONST_2); // allocate 2 * tmap.size to avoid rehashing while building map
    methodVisitor.visitInsn(IMUL);
    methodVisitor.visitMethodInsn(INVOKESPECIAL, "java/util/LinkedHashMap", "<init>", "(I)V");

    // i = 0
    methodVisitor.visitInsn(ICONST_0);
    methodVisitor.visitVarInsn(ISTORE, loopCounterLocal); // #4 = loop counter

    Label done = new Label();
    Label loop = new Label();
    methodVisitor.visitLabel(loop);
    methodVisitor.visitVarInsn(ILOAD, loopCounterLocal);
    methodVisitor.visitVarInsn(ILOAD, tmapSizeLocal);
    methodVisitor.visitJumpInsn(IF_ICMPGE, done);

    methodVisitor.visitInsn(DUP); // Map

    generateReadElement(methodVisitor, context, type.getKeyType());
    generateConvertToObject(methodVisitor, type.getKeyType());
    generateReadElement(methodVisitor, context, type.getValueType());
    generateConvertToObject(methodVisitor, type.getValueType());

    // entry is left on stack(0). Add to list
    methodVisitor.visitMethodInsn(INVOKEVIRTUAL, "java/util/LinkedHashMap", "put",
            "(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;");
    methodVisitor.visitInsn(POP);

    methodVisitor.visitIincInsn(loopCounterLocal, 1);
    methodVisitor.visitJumpInsn(GOTO, loop);

    methodVisitor.visitLabel(done);
    methodVisitor.visitVarInsn(ALOAD, context.getSlot("protocol"));
    methodVisitor.visitMethodInsn(INVOKEVIRTUAL, "com/facebook/thrift/protocol/TProtocol", "readMapEnd", "()V");

    context.release(tmapSizeLocal);
    context.release(loopCounterLocal);
}