Example usage for org.objectweb.asm MethodVisitor visitMaxs

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

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Introduction

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

Prototype

public void visitMaxs(final int maxStack, final int maxLocals)

Source Link

Document

Visits the maximum stack size and the maximum number of local variables of the method.

Usage

From source file:net.minecrell.quartz.event.EventHandlerClassFactory.java

License:MIT License

private static byte[] generateClass(String name, Class<?> handle, Method method, Class<?> eventClass) {
    name = name.replace('.', '/');

    final String handleName = Type.getInternalName(handle);
    final String handleDescriptor = Type.getDescriptor(handle);
    final String eventName = Type.getInternalName(eventClass);

    ClassWriter cw = new ClassWriter(0);
    FieldVisitor fv;//from  w  w  w.j ava2s  . c  o m
    MethodVisitor mv;

    cw.visit(V1_8, ACC_PUBLIC + ACC_FINAL + ACC_SUPER, name, null, "java/lang/Object",
            new String[] { EVENT_HANDLER_CLASS });

    {
        fv = cw.visitField(ACC_PRIVATE + ACC_FINAL, "handle", handleDescriptor, null, null);
        fv.visitEnd();
    }
    {
        mv = cw.visitMethod(ACC_PUBLIC, "<init>", '(' + handleDescriptor + ")V", null, null);
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitVarInsn(ALOAD, 1);
        mv.visitFieldInsn(PUTFIELD, name, "handle", handleDescriptor);
        mv.visitInsn(RETURN);
        mv.visitMaxs(2, 2);
        mv.visitEnd();
    }
    {
        mv = cw.visitMethod(ACC_PUBLIC, "getHandle", "()Ljava/lang/Object;", null, null);
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, name, "handle", handleDescriptor);
        mv.visitInsn(ARETURN);
        mv.visitMaxs(1, 1);
        mv.visitEnd();
    }
    {
        mv = cw.visitMethod(ACC_PUBLIC, "handle", EVENT_HANDLER_METHOD, null, null);
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, name, "handle", handleDescriptor);
        mv.visitVarInsn(ALOAD, 1);
        mv.visitTypeInsn(CHECKCAST, eventName);
        mv.visitMethodInsn(INVOKEVIRTUAL, handleName, method.getName(), "(L" + eventName + ";)V", false);
        mv.visitInsn(RETURN);
        mv.visitMaxs(2, 2);
        mv.visitEnd();
    }
    cw.visitEnd();

    return cw.toByteArray();
}

From source file:net.openhft.smoothie.SegmentClassGenerator.java

License:Open Source License

private static byte[] classBytes(String segmentClassName, int allocationCapacity) {
    ClassWriter cw = new ClassWriter(0);
    String segmentClassNameWithSlashes = segmentClassName.replace('.', '/');
    cw.visit(52, ACC_PUBLIC + ACC_SUPER, segmentClassNameWithSlashes + allocationCapacity, null,
            segmentClassNameWithSlashes, null);

    for (int i = 1; i < allocationCapacity; i++) {
        FieldVisitor fv;/*from  ww w  .ja  v a2  s  . c  om*/
        fv = cw.visitField(0, "k" + i, "Ljava/lang/Object;", null, null);
        fv.visitEnd();
        fv = cw.visitField(0, "v" + i, "Ljava/lang/Object;", null, null);
        fv.visitEnd();
    }
    {
        MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKESPECIAL, segmentClassNameWithSlashes, "<init>", "()V", false);
        mv.visitInsn(RETURN);
        mv.visitMaxs(1, 1);
        mv.visitEnd();
    }
    cw.visitEnd();

    return cw.toByteArray();
}

From source file:net.orfjackal.dimdwarf.aop.AddEqualsAndHashCodeMethodsForEntities.java

License:Open Source License

private void addEqualsMethod() {
    MethodVisitor mv = cv.visitMethod(ACC_PUBLIC, "equals", "(Ljava/lang/Object;)Z", null, null);
    mv.visitCode();//from w  w  w  . j av a2 s  .c om
    mv.visitVarInsn(ALOAD, 0);
    mv.visitVarInsn(ALOAD, 1);
    mv.visitMethodInsn(INVOKESTATIC, entityHelperClass, "equals", "(Ljava/lang/Object;Ljava/lang/Object;)Z");
    mv.visitInsn(IRETURN);
    mv.visitMaxs(2, 2);
    mv.visitEnd();
}

From source file:net.orfjackal.dimdwarf.aop.AddEqualsAndHashCodeMethodsForEntities.java

License:Open Source License

private void addHashCodeMethod() {
    MethodVisitor mv = cv.visitMethod(ACC_PUBLIC, "hashCode", "()I", null, null);
    mv.visitCode();// w w w.  ja va2s .com
    mv.visitVarInsn(ALOAD, 0);
    mv.visitMethodInsn(INVOKESTATIC, entityHelperClass, "hashCode", "(Ljava/lang/Object;)I");
    mv.visitInsn(IRETURN);
    mv.visitMaxs(1, 1);
    mv.visitEnd();
}

From source file:net.orfjackal.retrolambda.defaultmethods.ClassModifier.java

License:Open Source License

@Override
public void visitEnd() {
    for (MethodContainer m : defaultMethods) {
        if (visitedMethods.contains(new VisitedMethod(m.methodName, m.methodDesc))) {
            continue;
        }/*w w w  .  j  av  a 2 s  .  c o m*/
        System.out.println("VISITEND, CREATING PROXY " + m);
        MethodVisitor tmp = super.visitMethod(ACC_PUBLIC, m.methodName, m.methodDesc, m.signature,
                m.exceptions);
        tmp.visitVarInsn(ALOAD, 0);
        int i = 1;
        for (Type arg : Type.getArgumentTypes(m.methodDesc)) {
            tmp.visitVarInsn(arg.getOpcode(ILOAD), i++);
        }
        String rightInterface = findRightInterace(m, interfaces);
        System.out.println("It thinks that the right interface is " + rightInterface);
        String mDesc = Helpers.addParam(m.methodDesc, rightInterface);
        tmp.visitMethodInsn(INVOKESTATIC, rightInterface + "$helper", m.methodName, mDesc, false);
        tmp.visitInsn(Type.getReturnType(m.methodDesc).getOpcode(IRETURN));
        tmp.visitMaxs(0, 0);
        tmp.visitEnd();
    }
    super.visitEnd();
}

From source file:net.orfjackal.retrolambda.defaultmethods.InterfaceModifier.java

License:Open Source License

private void createBridge(Method meth, MethodContainer m) {
    int access = ACC_PUBLIC | ACC_STATIC | ACC_BRIDGE;
    String desc = Helpers.addParam(m.methodDesc, className);
    String returnType = Type.getReturnType(meth).getInternalName();
    desc = Helpers.changeReturnType(desc, returnType);
    MethodVisitor tmp = getHelperClassVisitor().visitMethod(access, m.methodName, desc, m.signature,
            m.exceptions);/*from  w  w  w.  j a v  a 2s .c  om*/
    tmp.visitVarInsn(ALOAD, 0);
    int i = 1;
    for (Type arg : Type.getArgumentTypes(m.methodDesc)) {
        tmp.visitVarInsn(arg.getOpcode(ILOAD), i++);
    }
    String mDesc = Helpers.addParam(m.methodDesc, className);
    tmp.visitMethodInsn(INVOKESTATIC, className + "$helper", m.methodName, mDesc, false);
    tmp.visitInsn(ARETURN);
    tmp.visitMaxs(0, 0);
    tmp.visitEnd();
}

From source file:net.orfjackal.retrolambda.defaultmethods.InterfaceModifier.java

License:Open Source License

private ClassWriter mkHelperClassVisitor() {
    ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
    cw.visit(targetByteCode, ACC_PUBLIC + ACC_SUPER, helperClassName(), null, "java/lang/Object", null);
    MethodVisitor mv = cw.visitMethod(ACC_PRIVATE, "<init>", "()V", null, null);
    mv.visitVarInsn(ALOAD, 0);/*from   w w w . j a va2s .c  om*/
    mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
    mv.visitInsn(RETURN);
    mv.visitMaxs(0, 0);
    mv.visitEnd();
    return cw;
}

From source file:net.orfjackal.retrolambda.lambdas.BackportLambdaClass.java

License:Open Source License

private void makeSingleton() {
    FieldVisitor fv = super.visitField(ACC_PRIVATE | ACC_STATIC | ACC_FINAL, SINGLETON_FIELD_NAME,
            singletonFieldDesc(), null, null);
    fv.visitEnd();//w ww  . j  a  v  a2s  .  c  o  m

    MethodVisitor mv = super.visitMethod(ACC_STATIC, "<clinit>", "()V", null, null);
    mv.visitCode();
    mv.visitTypeInsn(NEW, lambdaClass);
    mv.visitInsn(DUP);
    mv.visitMethodInsn(INVOKESPECIAL, lambdaClass, "<init>", "()V", false);
    mv.visitFieldInsn(PUTSTATIC, lambdaClass, SINGLETON_FIELD_NAME, singletonFieldDesc());
    mv.visitInsn(RETURN);
    mv.visitMaxs(-1, -1); // rely on ClassWriter.COMPUTE_MAXS
    mv.visitEnd();
}

From source file:net.orfjackal.retrolambda.lambdas.BackportLambdaClass.java

License:Open Source License

private void generateFactoryMethod() {
    MethodVisitor mv = cv.visitMethod(ACC_PUBLIC | ACC_STATIC, factoryMethod.getName(), factoryMethod.getDesc(),
            null, null);//w w  w . j  av  a 2 s  .com
    mv.visitCode();

    if (isStateless()) {
        mv.visitFieldInsn(GETSTATIC, lambdaClass, SINGLETON_FIELD_NAME, singletonFieldDesc());
        mv.visitInsn(ARETURN);

    } else {
        mv.visitTypeInsn(NEW, lambdaClass);
        mv.visitInsn(DUP);
        int varIndex = 0;
        for (Type type : constructor.getArgumentTypes()) {
            mv.visitVarInsn(type.getOpcode(ILOAD), varIndex);
            varIndex += type.getSize();
        }
        mv.visitMethodInsn(INVOKESPECIAL, lambdaClass, "<init>", constructor.getDescriptor(), false);
        mv.visitInsn(ARETURN);
    }

    mv.visitMaxs(-1, -1); // rely on ClassWriter.COMPUTE_MAXS
    mv.visitEnd();
}

From source file:net.orfjackal.retrolambda.util.Bytecode.java

License:Open Source License

public static void generateDelegateMethod(ClassVisitor cv, int access, Handle method, Handle target) {
    MethodVisitor mv = cv.visitMethod(access, method.getName(), method.getDesc(), null, null);
    mv.visitCode();/*from   ww  w. ja v  a 2  s  .  c  o m*/

    // if the target method is constructor, then we must NEW up the instance inside the delegate method
    if (target.getTag() == H_NEWINVOKESPECIAL) {
        mv.visitTypeInsn(NEW, target.getOwner());
        mv.visitInsn(DUP);
    }

    // we assume one of the methods to be static and the other virtual, i.e. it has an implicit 'this' argument
    Type[] args = longest(Type.getArgumentTypes(method.getDesc()), Type.getArgumentTypes(target.getDesc()));
    int varIndex = 0;
    for (Type arg : args) {
        mv.visitVarInsn(arg.getOpcode(ILOAD), varIndex);
        varIndex += arg.getSize();
    }
    mv.visitMethodInsn(Handles.getOpcode(target), target.getOwner(), target.getName(), target.getDesc(),
            target.getTag() == H_INVOKEINTERFACE);
    mv.visitInsn(Type.getReturnType(method.getDesc()).getOpcode(IRETURN));
    mv.visitMaxs(-1, -1); // rely on ClassWriter.COMPUTE_MAXS
    mv.visitEnd();
}