Examples with MethodVisitor org.objectweb.asm.MethodVisitor used on opensource projects

Example 71 with MethodVisitor

use of org.objectweb.asm.MethodVisitor in project groovy by apache.

the class MopWriter method generateMopCalls.

/**
     * generates a Meta Object Protocol method, that is used to call a non public
     * method, or to make a call to super.
     *
     * @param mopCalls list of methods a mop call method should be generated for
     * @param useThis  true if "this" should be used for the naming
     */
protected void generateMopCalls(LinkedList<MethodNode> mopCalls, boolean useThis) {
    for (MethodNode method : mopCalls) {
        String name = getMopMethodName(method, useThis);
        Parameter[] parameters = method.getParameters();
        String methodDescriptor = BytecodeHelper.getMethodDescriptor(method.getReturnType(), method.getParameters());
        MethodVisitor mv = controller.getClassVisitor().visitMethod(ACC_PUBLIC | ACC_SYNTHETIC, name, methodDescriptor, null, null);
        controller.setMethodVisitor(mv);
        mv.visitVarInsn(ALOAD, 0);
        int newRegister = 1;
        OperandStack operandStack = controller.getOperandStack();
        for (Parameter parameter : parameters) {
            ClassNode type = parameter.getType();
            operandStack.load(parameter.getType(), newRegister);
            // increment to next register, double/long are using two places
            newRegister++;
            if (type == ClassHelper.double_TYPE || type == ClassHelper.long_TYPE)
                newRegister++;
        }
        operandStack.remove(parameters.length);
        ClassNode declaringClass = method.getDeclaringClass();
        // JDK 8 support for default methods in interfaces
        // this should probably be strenghtened when we support the A.super.foo() syntax
        int opcode = declaringClass.isInterface() ? INVOKEINTERFACE : INVOKESPECIAL;
        mv.visitMethodInsn(opcode, BytecodeHelper.getClassInternalName(declaringClass), method.getName(), methodDescriptor, opcode == INVOKEINTERFACE);
        BytecodeHelper.doReturn(mv, method.getReturnType());
        mv.visitMaxs(0, 0);
        mv.visitEnd();
        controller.getClassNode().addMethod(name, ACC_PUBLIC | ACC_SYNTHETIC, method.getReturnType(), parameters, null, null);
    }
}

Example 72 with MethodVisitor

use of org.objectweb.asm.MethodVisitor in project groovy by apache.

the class OperandStack method popDownTo.

public void popDownTo(int elements) {
    int last = stack.size();
    MethodVisitor mv = controller.getMethodVisitor();
    while (last > elements) {
        last--;
        ClassNode element = popWithMessage(last);
        if (isTwoSlotType(element)) {
            mv.visitInsn(POP2);
        } else {
            mv.visitInsn(POP);
        }
    }
}

Example 73 with MethodVisitor

use of org.objectweb.asm.MethodVisitor in project groovy by apache.

the class OperandStack method storeVar.

public void storeVar(BytecodeVariable variable) {
    MethodVisitor mv = controller.getMethodVisitor();
    int idx = variable.getIndex();
    ClassNode type = variable.getType();
    // value is on stack
    if (variable.isHolder()) {
        doGroovyCast(type);
        box();
        mv.visitVarInsn(ALOAD, idx);
        mv.visitTypeInsn(CHECKCAST, "groovy/lang/Reference");
        mv.visitInsn(SWAP);
        mv.visitMethodInsn(INVOKEVIRTUAL, "groovy/lang/Reference", "set", "(Ljava/lang/Object;)V", false);
    } else {
        doGroovyCast(type);
        if (type == ClassHelper.double_TYPE) {
            mv.visitVarInsn(DSTORE, idx);
        } else if (type == ClassHelper.float_TYPE) {
            mv.visitVarInsn(FSTORE, idx);
        } else if (type == ClassHelper.long_TYPE) {
            mv.visitVarInsn(LSTORE, idx);
        } else if (type == ClassHelper.boolean_TYPE || type == ClassHelper.char_TYPE || type == ClassHelper.byte_TYPE || type == ClassHelper.int_TYPE || type == ClassHelper.short_TYPE) {
            mv.visitVarInsn(ISTORE, idx);
        } else {
            mv.visitVarInsn(ASTORE, idx);
        }
    }
    // remove RHS value from operand stack
    remove(1);
}

Example 74 with MethodVisitor

use of org.objectweb.asm.MethodVisitor in project groovy by apache.

the class OperandStack method box.

public ClassNode box() {
    MethodVisitor mv = controller.getMethodVisitor();
    int size = stack.size();
    ClassNode type = stack.get(size - 1);
    if (ClassHelper.isPrimitiveType(type) && ClassHelper.VOID_TYPE != type) {
        ClassNode wrapper = ClassHelper.getWrapper(type);
        BytecodeHelper.doCastToWrappedType(mv, type, wrapper);
        type = wrapper;
    }
    // else nothing to box
    stack.set(size - 1, type);
    return type;
}

Example 75 with MethodVisitor

use of org.objectweb.asm.MethodVisitor in project groovy by apache.

the class OperandStack method pushConstant.

/**
     * load the constant on the operand stack. 
     */
public void pushConstant(ConstantExpression expression) {
    MethodVisitor mv = controller.getMethodVisitor();
    Object value = expression.getValue();
    ClassNode origType = expression.getType().redirect();
    ClassNode type = ClassHelper.getUnwrapper(origType);
    boolean boxing = origType != type;
    boolean asPrimitive = boxing || ClassHelper.isPrimitiveType(type);
    if (value == null) {
        mv.visitInsn(ACONST_NULL);
    } else if (boxing && value instanceof Boolean) {
        // special path for boxed boolean
        Boolean bool = (Boolean) value;
        String text = bool ? "TRUE" : "FALSE";
        mv.visitFieldInsn(GETSTATIC, "java/lang/Boolean", text, "Ljava/lang/Boolean;");
        boxing = false;
        type = origType;
    } else if (asPrimitive) {
        pushPrimitiveConstant(mv, value, type);
    } else if (value instanceof BigDecimal) {
        String className = BytecodeHelper.getClassInternalName(value.getClass().getName());
        mv.visitTypeInsn(NEW, className);
        mv.visitInsn(DUP);
        mv.visitLdcInsn(value.toString());
        mv.visitMethodInsn(INVOKESPECIAL, className, "<init>", "(Ljava/lang/String;)V", false);
    } else if (value instanceof BigInteger) {
        String className = BytecodeHelper.getClassInternalName(value.getClass().getName());
        mv.visitTypeInsn(NEW, className);
        mv.visitInsn(DUP);
        mv.visitLdcInsn(value.toString());
        mv.visitMethodInsn(INVOKESPECIAL, className, "<init>", "(Ljava/lang/String;)V", false);
    } else if (value instanceof String) {
        mv.visitLdcInsn(value);
    } else {
        throw new ClassGeneratorException("Cannot generate bytecode for constant: " + value + " of type: " + type.getName());
    }
    push(type);
    if (boxing)
        box();
}