Examples of org.objectweb.asm.MethodVisitor.visitVarInsn()

org.objectweb.asm.MethodVisitor.visitVarInsn()
Visits a local variable instruction. A local variable instruction is an instruction that loads or stores the value of a local variable. @param opcode the opcode of the local variable instruction to be visited.This opcode is either ILOAD, LLOAD, FLOAD, DLOAD, ALOAD, ISTORE, LSTORE, FSTORE, DSTORE, ASTORE or RET. @param var the operand of the instruction to be visited. This operand isthe index of a local variable.

        int varSvc = freeRoom; 
        freeRoom = freeRoom + 1; // Object Reference.
        mv.visitVarInsn(ASTORE, varSvc); // Store the service object.
                
        // Invoke the method on the service object.
        mv.visitVarInsn(ALOAD, varSvc);
        // Push argument on the stack.
        int i = 1; // Arguments. (non static method)
        for (int t = 0; t < types.length; t++) {
            mv.visitVarInsn(types[t].getOpcode(ILOAD), i); 
            i = i + types[t].getSize();

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        // Invoke the method on the service object.
        mv.visitVarInsn(ALOAD, varSvc);
        // Push argument on the stack.
        int i = 1; // Arguments. (non static method)
        for (int t = 0; t < types.length; t++) {
            mv.visitVarInsn(types[t].getOpcode(ILOAD), i); 
            i = i + types[t].getSize();
        }
        // Invocation
        mv.visitMethodInsn(INVOKEINTERFACE, itfName, methodName, desc);

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     */
    private static void generateConstructor(ClassWriter cw, String className) {
        MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "<init>", '(' + DEPENDENCY_DESC + ")V", null, null);
        mv.visitCode();


        mv.visitVarInsn(ALOAD, 0); // Load this
        mv.visitInsn(DUP); // Dup
        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V"); // Call  super
        mv.visitVarInsn(ALOAD, 1); // Load the argument
        mv.visitFieldInsn(PUTFIELD, className, DEPENDENCY, DEPENDENCY_DESC); // Assign the dependency field
        mv.visitInsn(RETURN); // Return void

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        mv.visitCode();


        mv.visitVarInsn(ALOAD, 0); // Load this
        mv.visitInsn(DUP); // Dup
        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V"); // Call  super
        mv.visitVarInsn(ALOAD, 1); // Load the argument
        mv.visitFieldInsn(PUTFIELD, className, DEPENDENCY, DEPENDENCY_DESC); // Assign the dependency field
        mv.visitInsn(RETURN); // Return void


        mv.visitMaxs(0, 0);
        mv.visitEnd();

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    private static void createMethod(final ClassWriter cw, final String className, final String referenceName, final String fieldName, final String typeName, final boolean bind) {
        final org.objectweb.asm.Type type = org.objectweb.asm.Type.getType("L" + typeName.replace('.', '/') + ";");
        final String methodName = (bind ? "" : "un") + "bind" + referenceName.substring(0, 1).toUpperCase() + referenceName.substring(1);
        final MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PROTECTED, methodName, "(" + type.toString() + ")V", null, null);
        mv.visitVarInsn(Opcodes.ALOAD, 0);
        if ( bind ) {
            mv.visitVarInsn(type.getOpcode(Opcodes.ILOAD), 1);
            mv.visitFieldInsn(Opcodes.PUTFIELD, className.replace('.', '/'), fieldName, type.toString());
        } else {
            mv.visitFieldInsn(Opcodes.GETFIELD, className.replace('.', '/'), fieldName, type.toString());

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        final org.objectweb.asm.Type type = org.objectweb.asm.Type.getType("L" + typeName.replace('.', '/') + ";");
        final String methodName = (bind ? "" : "un") + "bind" + referenceName.substring(0, 1).toUpperCase() + referenceName.substring(1);
        final MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PROTECTED, methodName, "(" + type.toString() + ")V", null, null);
        mv.visitVarInsn(Opcodes.ALOAD, 0);
        if ( bind ) {
            mv.visitVarInsn(type.getOpcode(Opcodes.ILOAD), 1);
            mv.visitFieldInsn(Opcodes.PUTFIELD, className.replace('.', '/'), fieldName, type.toString());
        } else {
            mv.visitFieldInsn(Opcodes.GETFIELD, className.replace('.', '/'), fieldName, type.toString());
            mv.visitVarInsn(Opcodes.ALOAD, 1);
            final Label jmpLabel = new Label();

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        if ( bind ) {
            mv.visitVarInsn(type.getOpcode(Opcodes.ILOAD), 1);
            mv.visitFieldInsn(Opcodes.PUTFIELD, className.replace('.', '/'), fieldName, type.toString());
        } else {
            mv.visitFieldInsn(Opcodes.GETFIELD, className.replace('.', '/'), fieldName, type.toString());
            mv.visitVarInsn(Opcodes.ALOAD, 1);
            final Label jmpLabel = new Label();
            mv.visitJumpInsn(Opcodes.IF_ACMPNE, jmpLabel);
            mv.visitVarInsn(Opcodes.ALOAD, 0);
            mv.visitInsn(Opcodes.ACONST_NULL);
            mv.visitFieldInsn(Opcodes.PUTFIELD, className.replace('.', '/'), fieldName, type.toString());

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        } else {
            mv.visitFieldInsn(Opcodes.GETFIELD, className.replace('.', '/'), fieldName, type.toString());
            mv.visitVarInsn(Opcodes.ALOAD, 1);
            final Label jmpLabel = new Label();
            mv.visitJumpInsn(Opcodes.IF_ACMPNE, jmpLabel);
            mv.visitVarInsn(Opcodes.ALOAD, 0);
            mv.visitInsn(Opcodes.ACONST_NULL);
            mv.visitFieldInsn(Opcodes.PUTFIELD, className.replace('.', '/'), fieldName, type.toString());
            mv.visitLabel(jmpLabel);
        }
        mv.visitInsn(Opcodes.RETURN);

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    mv.visitMethodInsn(Opcodes.INVOKESPECIAL, this_class_name, "<init>",
        "()V");


    for (int i = 0; i < arity; i++) {
      mv.visitInsn(Opcodes.DUP);
      mv.visitVarInsn(Opcodes.ALOAD, i);
      mv.visitFieldInsn(Opcodes.PUTFIELD, this_class_name, "elem"+(i+1), EOBJECT_DESC);
    }
    
    mv.visitInsn(Opcodes.ARETURN);

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    MethodVisitor mv;
    mv = cw.visitMethod(Opcodes.ACC_PUBLIC | Opcodes.ACC_SYNTHETIC
        | Opcodes.ACC_BRIDGE, "blank", "()L" + super_class_name + ";",
        null, null);
    mv.visitCode();
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, this_class_name, "blank",
        "()L" + this_class_name + ";");
    mv.visitInsn(Opcodes.ARETURN);
    mv.visitMaxs(1, 1);
    mv.visitEnd();

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