Example usage for org.objectweb.asm.commons GeneratorAdapter loadArg

List of usage examples for org.objectweb.asm.commons GeneratorAdapter loadArg

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Introduction

In this page you can find the example usage for org.objectweb.asm.commons GeneratorAdapter loadArg.

Prototype

public void loadArg(final int arg)

Source Link

Document

Generates the instruction to load the given method argument on the stack.

Usage

From source file:co.cask.cdap.internal.app.runtime.batch.distributed.ContainerLauncherGenerator.java

License:Apache License

/**
 * Generates the bytecode for a main class and writes to the given {@link JarOutputStream}.
 * The generated class looks like this:// w ww . j  a v  a2s  .  c  o m
 *
 * <pre>{@code
 * class className {
 *   public static void main(String[] args) {
 *     MapReduceContainerLauncher.launch(launcherClassPath, classLoaderName, className, args);
 *   }
 * }
 * }
 * </pre>
 *
 * The {@code launcherClassPath}, {@code classLoaderName} and {@code className} are represented as
 * string literals in the generated class.
 */
private static void generateLauncherClass(String launcherClassPath, String classLoaderName, String className,
        JarOutputStream output) throws IOException {
    String internalName = className.replace('.', '/');

    ClassWriter classWriter = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
    classWriter.visit(Opcodes.V1_7, Opcodes.ACC_PUBLIC + Opcodes.ACC_SUPER, internalName, null,
            Type.getInternalName(Object.class), null);

    Method constructor = Methods.getMethod(void.class, "<init>");

    // Constructor
    // MRAppMaster()
    GeneratorAdapter mg = new GeneratorAdapter(Opcodes.ACC_PUBLIC, constructor, null, null, classWriter);

    mg.loadThis();
    mg.invokeConstructor(Type.getType(Object.class), constructor);
    mg.returnValue();
    mg.endMethod();

    // Main method.
    // public static void main(String[] args) {
    //   MapReduceContainerLauncher.launch(launcherClassPath, classLoaderName, className, args);
    // }
    Method mainMethod = Methods.getMethod(void.class, "main", String[].class);
    mg = new GeneratorAdapter(Opcodes.ACC_PUBLIC + Opcodes.ACC_STATIC, mainMethod, null,
            new Type[] { Type.getType(Exception.class) }, classWriter);

    mg.getStatic(Type.getType(System.class), "out", Type.getType(PrintStream.class));
    mg.visitLdcInsn("Launch class " + className);
    mg.invokeVirtual(Type.getType(PrintStream.class), Methods.getMethod(void.class, "println", String.class));

    // The Launcher classpath, classloader name and main classname are stored as string literal in the generated class
    mg.visitLdcInsn(launcherClassPath);
    mg.visitLdcInsn(classLoaderName);
    mg.visitLdcInsn(className);
    mg.loadArg(0);
    mg.invokeStatic(Type.getType(MapReduceContainerLauncher.class),
            Methods.getMethod(void.class, "launch", String.class, String.class, String.class, String[].class));
    mg.returnValue();
    mg.endMethod();

    classWriter.visitEnd();

    output.putNextEntry(new JarEntry(internalName + ".class"));
    output.write(classWriter.toByteArray());
}

From source file:co.cask.cdap.internal.app.runtime.batch.distributed.ContainerLauncherGenerator.java

License:Apache License

/**
 * Generates a class that has a static main method which delegates the call to a static method in the given delegator
 * class with method signature {@code public static void launch(String className, String[] args)}
 *
 * @param className the classname of the generated class
 * @param mainDelegator the class to delegate the main call to
 * @param output for writing the generated bytes
 *//*from   w  ww  .  jav  a  2 s.c o m*/
private static void generateMainClass(String className, Type mainDelegator, JarOutputStream output)
        throws IOException {
    String internalName = className.replace('.', '/');

    ClassWriter classWriter = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
    classWriter.visit(Opcodes.V1_7, Opcodes.ACC_PUBLIC + Opcodes.ACC_SUPER, internalName, null,
            Type.getInternalName(Object.class), null);

    // Generate the default constructor, which just call super()
    Method constructor = Methods.getMethod(void.class, "<init>");
    GeneratorAdapter mg = new GeneratorAdapter(Opcodes.ACC_PUBLIC, constructor, null, null, classWriter);
    mg.loadThis();
    mg.invokeConstructor(Type.getType(Object.class), constructor);
    mg.returnValue();
    mg.endMethod();

    // Generate the main method
    // public static void main(String[] args) {
    //   System.out.println("Launch class .....");
    //   <MainDelegator>.launch(<className>, args);
    // }
    Method mainMethod = Methods.getMethod(void.class, "main", String[].class);
    mg = new GeneratorAdapter(Opcodes.ACC_PUBLIC + Opcodes.ACC_STATIC, mainMethod, null,
            new Type[] { Type.getType(Exception.class) }, classWriter);

    mg.getStatic(Type.getType(System.class), "out", Type.getType(PrintStream.class));
    mg.visitLdcInsn("Launch class " + className + " by calling " + mainDelegator.getClassName() + ".launch");
    mg.invokeVirtual(Type.getType(PrintStream.class), Methods.getMethod(void.class, "println", String.class));

    // The main classname is stored as string literal in the generated class
    mg.visitLdcInsn(className);
    mg.loadArg(0);
    mg.invokeStatic(mainDelegator, Methods.getMethod(void.class, "launch", String.class, String[].class));
    mg.returnValue();
    mg.endMethod();

    classWriter.visitEnd();

    output.putNextEntry(new JarEntry(internalName + ".class"));
    output.write(classWriter.toByteArray());
}

From source file:co.cask.cdap.internal.app.runtime.service.http.HttpHandlerGenerator.java

License:Apache License

/**
 * Generates the constructor. The constructor generated has signature {@code (DelegatorContext, MetricsContext)}.
 *///from   w w w . j ava  2s .  c o  m
private void generateConstructor(TypeToken<? extends HttpServiceHandler> delegateType,
        ClassWriter classWriter) {
    Method constructor = Methods.getMethod(void.class, "<init>", DelegatorContext.class, MetricsContext.class);
    String signature = Signatures.getMethodSignature(constructor, getContextType(delegateType),
            TypeToken.of(MetricsContext.class));

    // Constructor(DelegatorContext, MetricsContext)
    GeneratorAdapter mg = new GeneratorAdapter(Opcodes.ACC_PUBLIC, constructor, signature, null, classWriter);

    // super(context, metricsContext);
    mg.loadThis();
    mg.loadArg(0);
    mg.loadArg(1);
    mg.invokeConstructor(Type.getType(AbstractHttpHandlerDelegator.class),
            Methods.getMethod(void.class, "<init>", DelegatorContext.class, MetricsContext.class));
    mg.returnValue();
    mg.endMethod();
}

From source file:co.cask.cdap.internal.io.DatumWriterGenerator.java

License:Apache License

/**
 * Generates the constructor. The constructor generated has signature {@code (Schema, FieldAccessorFactory)}.
 *//*w w  w  .  java2  s.c o  m*/
private void generateConstructor() {
    Method constructor = getMethod(void.class, "<init>", Schema.class, FieldAccessorFactory.class);

    // Constructor(Schema schema, FieldAccessorFactory accessorFactory)
    GeneratorAdapter mg = new GeneratorAdapter(Opcodes.ACC_PUBLIC, constructor, null, null, classWriter);

    // super(); // Calling Object constructor
    mg.loadThis();
    mg.invokeConstructor(Type.getType(Object.class), getMethod(void.class, "<init>"));

    // if (!SCHEMA_HASH.equals(schema.getSchemaHash().toString())) { throw IllegalArgumentException }
    mg.getStatic(classType, "SCHEMA_HASH", Type.getType(String.class));
    mg.loadArg(0);
    mg.invokeVirtual(Type.getType(Schema.class), getMethod(SchemaHash.class, "getSchemaHash"));
    mg.invokeVirtual(Type.getType(SchemaHash.class), getMethod(String.class, "toString"));
    mg.invokeVirtual(Type.getType(String.class), getMethod(boolean.class, "equals", Object.class));
    Label hashEquals = mg.newLabel();
    mg.ifZCmp(GeneratorAdapter.NE, hashEquals);
    mg.throwException(Type.getType(IllegalArgumentException.class), "Schema not match.");
    mg.mark(hashEquals);

    // this.schema = schema;
    mg.loadThis();
    mg.loadArg(0);
    mg.putField(classType, "schema", Type.getType(Schema.class));

    // For each record field that needs an accessor, get the accessor and store it in field.
    for (Map.Entry<TypeToken<?>, String> entry : fieldAccessorRequests.entries()) {
        String fieldAccessorName = getFieldAccessorName(entry.getKey(), entry.getValue());

        classWriter.visitField(Opcodes.ACC_PRIVATE + Opcodes.ACC_FINAL, fieldAccessorName,
                Type.getDescriptor(FieldAccessor.class), null, null);
        // this.fieldAccessorName
        //  = accessorFactory.getFieldAccessor(TypeToken.of(Class.forName("className")), "fieldName");
        mg.loadThis();
        mg.loadArg(1);
        mg.push(entry.getKey().getRawType().getName());
        mg.invokeStatic(Type.getType(Class.class), getMethod(Class.class, "forName", String.class));
        mg.invokeStatic(Type.getType(TypeToken.class), getMethod(TypeToken.class, "of", Class.class));
        mg.push(entry.getValue());
        mg.invokeInterface(Type.getType(FieldAccessorFactory.class),
                getMethod(FieldAccessor.class, "getFieldAccessor", TypeToken.class, String.class));
        mg.putField(classType, fieldAccessorName, Type.getType(FieldAccessor.class));
    }

    mg.returnValue();
    mg.endMethod();
}

From source file:co.cask.cdap.internal.io.DatumWriterGenerator.java

License:Apache License

/**
 * Generates the {@link DatumWriter#encode(Object, co.cask.cdap.common.io.Encoder)} method.
 * @param outputType Type information of the data type for output
 * @param schema Schema to use for output.
 *///www.jav  a2 s . c  o  m
private void generateEncode(TypeToken<?> outputType, Schema schema) {
    TypeToken<?> callOutputType = getCallTypeToken(outputType, schema);

    Method encodeMethod = getMethod(void.class, "encode", callOutputType.getRawType(), Encoder.class);

    if (!Object.class.equals(callOutputType.getRawType())) {
        // Generate the synthetic method for the bridging
        Method method = getMethod(void.class, "encode", Object.class, Encoder.class);
        GeneratorAdapter mg = new GeneratorAdapter(
                Opcodes.ACC_PUBLIC + Opcodes.ACC_BRIDGE + Opcodes.ACC_SYNTHETIC, method, null,
                new Type[] { Type.getType(IOException.class) }, classWriter);

        mg.loadThis();
        mg.loadArg(0);
        mg.checkCast(Type.getType(callOutputType.getRawType()));
        mg.loadArg(1);
        mg.invokeVirtual(classType, encodeMethod);
        mg.returnValue();
        mg.endMethod();
    }

    // Generate the top level public encode method
    String methodSignature = null;
    if (callOutputType.getType() instanceof ParameterizedType) {
        methodSignature = Signatures.getMethodSignature(encodeMethod, callOutputType, null);
    }
    GeneratorAdapter mg = new GeneratorAdapter(Opcodes.ACC_PUBLIC, encodeMethod, methodSignature,
            new Type[] { Type.getType(IOException.class) }, classWriter);

    // Delegate to the actual encode method(value, encoder, schema, Sets.newIdentityHashSet());
    mg.loadThis();
    mg.loadArg(0);
    mg.loadArg(1);
    mg.loadThis();
    mg.getField(classType, "schema", Type.getType(Schema.class));
    // seenRefs Set
    mg.invokeStatic(Type.getType(Sets.class), getMethod(Set.class, "newIdentityHashSet"));
    mg.invokeVirtual(classType, getEncodeMethod(outputType, schema));
    mg.returnValue();
    mg.endMethod();
}

From source file:co.cask.cdap.internal.io.DatumWriterGenerator.java

License:Apache License

/**
 * Generates method body for encoding an compile time int value.
 * @param mg Method body generator/*from   w  w  w . j a  va 2 s.  c  o  m*/
 * @param intValue The integer constant value to encode
 * @param encoder Method argument index of the encoder
 */
private void encodeInt(GeneratorAdapter mg, int intValue, int encoder) {
    mg.loadArg(encoder);
    mg.push(intValue);
    mg.invokeInterface(Type.getType(Encoder.class), getMethod(Encoder.class, "writeInt", int.class));
    mg.pop();
}

From source file:co.cask.cdap.internal.io.DatumWriterGenerator.java

License:Apache License

/**
 * Generates method body for encoding simple schema type by calling corresponding write method in Encoder.
 * @param mg Method body generator/*  w  w  w .ja  va 2 s .com*/
 * @param type Data type to encode
 * @param encodeMethod Name of the encode method to invoke on the given encoder.
 * @param value Argument index of the value to encode.
 * @param encoder Method argument index of the encoder
 */
private void encodeSimple(GeneratorAdapter mg, TypeToken<?> type, Schema schema, String encodeMethod, int value,
        int encoder) {
    // encoder.writeXXX(value);
    TypeToken<?> encodeType = type;
    mg.loadArg(encoder);
    mg.loadArg(value);
    if (Primitives.isWrapperType(encodeType.getRawType())) {
        encodeType = TypeToken.of(Primitives.unwrap(encodeType.getRawType()));
        mg.unbox(Type.getType(encodeType.getRawType()));
        // A special case since INT type represents (byte, char, short and int).
        if (schema.getType() == Schema.Type.INT && !int.class.equals(encodeType.getRawType())) {
            encodeType = TypeToken.of(int.class);
        }
    } else if (schema.getType() == Schema.Type.STRING && !String.class.equals(encodeType.getRawType())) {
        // For non-string object that has a String schema, invoke toString().
        mg.invokeVirtual(Type.getType(encodeType.getRawType()), getMethod(String.class, "toString"));
        encodeType = TypeToken.of(String.class);
    } else if (schema.getType() == Schema.Type.BYTES && UUID.class.equals(encodeType.getRawType())) {
        // Special case UUID, encode as byte array

        // ByteBuffer buf = ByteBuffer.allocate(Longs.BYTES * 2)
        //                            .putLong(uuid.getMostSignificantBits())
        //                            .putLong(uuid.getLeastSignificantBits());
        // encoder.writeBytes((ByteBuffer) buf.flip());

        Type byteBufferType = Type.getType(ByteBuffer.class);
        Type uuidType = Type.getType(UUID.class);

        mg.push(Longs.BYTES * 2);
        mg.invokeStatic(byteBufferType, getMethod(ByteBuffer.class, "allocate", int.class));
        mg.swap();

        mg.invokeVirtual(uuidType, getMethod(long.class, "getMostSignificantBits"));
        mg.invokeVirtual(byteBufferType, getMethod(ByteBuffer.class, "putLong", long.class));

        mg.loadArg(value);
        mg.invokeVirtual(uuidType, getMethod(long.class, "getLeastSignificantBits"));
        mg.invokeVirtual(byteBufferType, getMethod(ByteBuffer.class, "putLong", long.class));

        mg.invokeVirtual(Type.getType(Buffer.class), getMethod(Buffer.class, "flip"));
        mg.checkCast(byteBufferType);

        encodeType = TypeToken.of(ByteBuffer.class);
    }
    mg.invokeInterface(Type.getType(Encoder.class),
            getMethod(Encoder.class, encodeMethod, encodeType.getRawType()));
    mg.pop();
}

From source file:co.cask.cdap.internal.io.DatumWriterGenerator.java

License:Apache License

/**
 * Generates method body for encoding enum value.
 * @param mg Method body generator/*from  ww w  .  j  a va 2s.com*/
 * @param outputType
 * @param value
 * @param encoder
 * @param schemaLocal
 */
private void encodeEnum(GeneratorAdapter mg, TypeToken<?> outputType, int value, int encoder, int schemaLocal) {

    // Enum type might be defined by the user, hence need to preserve class loading of it
    preservedClasses.add(outputType.getRawType());
    // encoder.writeInt(this.schema.getEnumIndex(value.name()));
    mg.loadArg(encoder);
    mg.loadArg(schemaLocal);
    mg.loadArg(value);
    mg.invokeVirtual(Type.getType(outputType.getRawType()), getMethod(String.class, "name"));
    mg.invokeVirtual(Type.getType(Schema.class), getMethod(int.class, "getEnumIndex", String.class));
    mg.invokeInterface(Type.getType(Encoder.class), getMethod(Encoder.class, "writeInt", int.class));
    mg.pop();
}

From source file:co.cask.cdap.internal.io.DatumWriterGenerator.java

License:Apache License

/**
 * Generates method body for encoding Collection value. The logic is like this:
 *
 * <pre>/*from www  . ja  v a2 s  .c  om*/
 * {@code
 *
 * encoder.writeInt(collection.size());
 * for (T element : collection) {
 *   encodeElement(element, encoder, elementSchema, seenRefs);
 * }
 * if (collection.size() > 0) {
 *   encoder.writeInt(0);
 * }
 * }
 * </pre>
 * @param mg
 * @param componentType
 * @param componentSchema
 * @param value
 * @param encoder
 */
private void encodeCollection(GeneratorAdapter mg, TypeToken<?> componentType, Schema componentSchema,
        int value, int encoder, int schemaLocal, int seenRefs) {
    // Encode and store the collection length locally
    mg.loadArg(value);
    mg.invokeInterface(Type.getType(Collection.class), getMethod(int.class, "size"));
    int length = mg.newLocal(Type.INT_TYPE);
    mg.storeLocal(length);

    mg.loadArg(encoder);
    mg.loadLocal(length);
    mg.invokeInterface(Type.getType(Encoder.class), getMethod(Encoder.class, "writeInt", int.class));
    mg.pop();

    // Store the component schema
    mg.loadArg(schemaLocal);
    mg.invokeVirtual(Type.getType(Schema.class), getMethod(Schema.class, "getComponentSchema"));
    int componentSchemaLocal = mg.newLocal(Type.getType(Schema.class));
    mg.storeLocal(componentSchemaLocal);

    // Store the iterator
    int iterator = mg.newLocal(Type.getType(Iterator.class));
    mg.loadArg(value);
    mg.invokeInterface(Type.getType(Collection.class), getMethod(Iterator.class, "iterator"));
    mg.storeLocal(iterator);

    // For loop with iterator. Encode each component
    Label beginFor = mg.mark();
    Label endFor = mg.newLabel();
    mg.loadLocal(iterator);
    mg.invokeInterface(Type.getType(Iterator.class), getMethod(boolean.class, "hasNext"));
    mg.ifZCmp(GeneratorAdapter.EQ, endFor);

    // Call the encode method for encoding the element.
    mg.loadThis();

    mg.loadLocal(iterator);
    mg.invokeInterface(Type.getType(Iterator.class), getMethod(Object.class, "next"));
    doCast(mg, componentType, componentSchema);
    mg.loadArg(encoder);
    mg.loadLocal(componentSchemaLocal);
    mg.loadArg(seenRefs);
    mg.invokeVirtual(classType, getEncodeMethod(componentType, componentSchema));
    mg.goTo(beginFor);

    mg.mark(endFor);

    // if length > 0, write out 0 at the end of array.
    Label zeroLength = mg.newLabel();
    mg.loadLocal(length);
    mg.ifZCmp(GeneratorAdapter.LE, zeroLength);
    encodeInt(mg, 0, encoder);
    mg.mark(zeroLength);
}

From source file:co.cask.cdap.internal.io.DatumWriterGenerator.java

License:Apache License

/**
 * Generates method body for encoding array value. The logic is similar to the one in
 * {@link #encodeCollection}, with collection size replaced with array length.
 *
 * @param mg/*from  ww  w  . jav a2 s  . c o  m*/
 * @param componentType
 * @param componentSchema
 * @param value
 * @param encoder
 * @param schemaLocal
 * @param seenRefs
 */
private void encodeArray(GeneratorAdapter mg, TypeToken<?> componentType, Schema componentSchema, int value,
        int encoder, int schemaLocal, int seenRefs) {
    // Encode and store the array length locally
    mg.loadArg(value);
    mg.arrayLength();
    int length = mg.newLocal(Type.INT_TYPE);
    mg.storeLocal(length);

    mg.loadArg(encoder);
    mg.loadLocal(length);
    mg.invokeInterface(Type.getType(Encoder.class), getMethod(Encoder.class, "writeInt", int.class));
    mg.pop();

    // Store the component schema
    mg.loadArg(schemaLocal);
    mg.invokeVirtual(Type.getType(Schema.class), getMethod(Schema.class, "getComponentSchema"));
    int componentSchemaLocal = mg.newLocal(Type.getType(Schema.class));
    mg.storeLocal(componentSchemaLocal);

    // for (int idx = 0; idx < array.length; idx++)
    mg.push(0);
    int idx = mg.newLocal(Type.INT_TYPE);
    mg.storeLocal(idx);
    Label beginFor = mg.mark();
    Label endFor = mg.newLabel();
    mg.loadLocal(idx);
    mg.loadLocal(length);
    mg.ifICmp(GeneratorAdapter.GE, endFor);

    // Call encode method to encode array[idx]
    mg.loadThis();
    mg.loadArg(value);
    mg.loadLocal(idx);
    TypeToken<?> callTypeToken = getCallTypeToken(componentType, componentSchema);
    mg.arrayLoad(Type.getType(callTypeToken.getRawType()));
    mg.loadArg(encoder);
    mg.loadLocal(componentSchemaLocal);
    mg.loadArg(seenRefs);
    mg.invokeVirtual(classType, getEncodeMethod(componentType, componentSchema));

    mg.iinc(idx, 1);
    mg.goTo(beginFor);
    mg.mark(endFor);

    // if length > 0, write out 0 at the end of array.
    Label zeroLength = mg.newLabel();
    mg.loadLocal(length);
    mg.ifZCmp(GeneratorAdapter.LE, zeroLength);
    encodeInt(mg, 0, encoder);
    mg.mark(zeroLength);
}