Java Code Examples for jdk.internal.dynalink.CallSiteDescriptor#changeMethodType()

private GuardedInvocation createVarArgApplyOrCallCall(final boolean isApply, final CallSiteDescriptor desc,
        final LinkRequest request, final Object[] args) {
    final MethodType descType = desc.getMethodType();
    final int paramCount = descType.parameterCount();
    final Object[] varArgs = (Object[]) args[paramCount - 1];
    // -1 'cause we're not passing the vararg array itself
    final int copiedArgCount = args.length - 1;
    final int varArgCount = varArgs.length;

    // Spread arguments for the delegate createApplyOrCallCall invocation.
    final Object[] spreadArgs = new Object[copiedArgCount + varArgCount];
    System.arraycopy(args, 0, spreadArgs, 0, copiedArgCount);
    System.arraycopy(varArgs, 0, spreadArgs, copiedArgCount, varArgCount);

    // Spread call site descriptor for the delegate createApplyOrCallCall invocation. We drop vararg array and
    // replace it with a list of Object.class.
    final MethodType spreadType = descType.dropParameterTypes(paramCount - 1, paramCount).appendParameterTypes(
            Collections.<Class<?>>nCopies(varArgCount, Object.class));
    final CallSiteDescriptor spreadDesc = desc.changeMethodType(spreadType);

    // Delegate back to createApplyOrCallCall with the spread (that is, reverted to non-vararg) request/
    final LinkRequest spreadRequest = request.replaceArguments(spreadDesc, spreadArgs);
    final GuardedInvocation spreadInvocation = createApplyOrCallCall(isApply, spreadDesc, spreadRequest, spreadArgs);

    // Add spreader combinators to returned invocation and guard.
    return spreadInvocation.replaceMethods(
            // Use standard ScriptObject.pairArguments on the invocation
            pairArguments(spreadInvocation.getInvocation(), descType),
            // Use our specialized spreadGuardArguments on the guard (see below).
            spreadGuardArguments(spreadInvocation.getGuard(), descType));
}
 

private GuardedInvocation createVarArgApplyOrCallCall(final boolean isApply, final CallSiteDescriptor desc,
        final LinkRequest request, final Object[] args) {
    final MethodType descType = desc.getMethodType();
    final int paramCount = descType.parameterCount();
    final Object[] varArgs = (Object[]) args[paramCount - 1];
    // -1 'cause we're not passing the vararg array itself
    final int copiedArgCount = args.length - 1;
    final int varArgCount = varArgs.length;

    // Spread arguments for the delegate createApplyOrCallCall invocation.
    final Object[] spreadArgs = new Object[copiedArgCount + varArgCount];
    System.arraycopy(args, 0, spreadArgs, 0, copiedArgCount);
    System.arraycopy(varArgs, 0, spreadArgs, copiedArgCount, varArgCount);

    // Spread call site descriptor for the delegate createApplyOrCallCall invocation. We drop vararg array and
    // replace it with a list of Object.class.
    final MethodType spreadType = descType.dropParameterTypes(paramCount - 1, paramCount).appendParameterTypes(
            Collections.<Class<?>>nCopies(varArgCount, Object.class));
    final CallSiteDescriptor spreadDesc = desc.changeMethodType(spreadType);

    // Delegate back to createApplyOrCallCall with the spread (that is, reverted to non-vararg) request/
    final LinkRequest spreadRequest = request.replaceArguments(spreadDesc, spreadArgs);
    final GuardedInvocation spreadInvocation = createApplyOrCallCall(isApply, spreadDesc, spreadRequest, spreadArgs);

    // Add spreader combinators to returned invocation and guard.
    return spreadInvocation.replaceMethods(
            // Use standard ScriptObject.pairArguments on the invocation
            pairArguments(spreadInvocation.getInvocation(), descType),
            // Use our specialized spreadGuardArguments on the guard (see below).
            spreadGuardArguments(spreadInvocation.getGuard(), descType));
}
 

private GuardedInvocation createVarArgApplyOrCallCall(final boolean isApply, final CallSiteDescriptor desc,
        final LinkRequest request, final Object[] args) {
    final MethodType descType = desc.getMethodType();
    final int paramCount = descType.parameterCount();
    final Object[] varArgs = (Object[])args[paramCount - 1];
    // -1 'cause we're not passing the vararg array itself
    final int copiedArgCount = args.length - 1;
    final int varArgCount = varArgs.length;

    // Spread arguments for the delegate createApplyOrCallCall invocation.
    final Object[] spreadArgs = new Object[copiedArgCount + varArgCount];
    System.arraycopy(args, 0, spreadArgs, 0, copiedArgCount);
    System.arraycopy(varArgs, 0, spreadArgs, copiedArgCount, varArgCount);

    // Spread call site descriptor for the delegate createApplyOrCallCall invocation. We drop vararg array and
    // replace it with a list of Object.class.
    final MethodType spreadType = descType.dropParameterTypes(paramCount - 1, paramCount).appendParameterTypes(
            Collections.<Class<?>>nCopies(varArgCount, Object.class));
    final CallSiteDescriptor spreadDesc = desc.changeMethodType(spreadType);

    // Delegate back to createApplyOrCallCall with the spread (that is, reverted to non-vararg) request/
    final LinkRequest spreadRequest = request.replaceArguments(spreadDesc, spreadArgs);
    final GuardedInvocation spreadInvocation = createApplyOrCallCall(isApply, spreadDesc, spreadRequest, spreadArgs);

    // Add spreader combinators to returned invocation and guard.
    return spreadInvocation.replaceMethods(
            // Use standard ScriptObject.pairArguments on the invocation
            pairArguments(spreadInvocation.getInvocation(), descType),
            // Use our specialized spreadGuardArguments on the guard (see below).
            spreadGuardArguments(spreadInvocation.getGuard(), descType));
}
 

@Override
public GuardedInvocation getGuardedInvocation(final LinkRequest linkRequest, final LinkerServices linkerServices) throws Exception {
    final Object objBoundCallable = linkRequest.getReceiver();
    if(!(objBoundCallable instanceof BoundCallable)) {
        return null;
    }

    final CallSiteDescriptor descriptor = linkRequest.getCallSiteDescriptor();
    if (descriptor.getNameTokenCount() < 2 || !"dyn".equals(descriptor.getNameToken(CallSiteDescriptor.SCHEME))) {
        return null;
    }
    final String operation = descriptor.getNameToken(CallSiteDescriptor.OPERATOR);
    // We need to distinguish "dyn:new" from "dyn:call" because "dyn:call" sites have parameter list of the form
    // "callee, this, args", while "dyn:call" sites have "callee, args" -- they lack the "this" parameter.
    final boolean isCall;
    if ("new".equals(operation)) {
        isCall = false;
    } else if ("call".equals(operation)) {
        isCall = true;
    } else {
        // Only dyn:call and dyn:new are supported.
        return null;
    }
    final BoundCallable boundCallable = (BoundCallable)objBoundCallable;
    final Object callable = boundCallable.getCallable();
    final Object boundThis = boundCallable.getBoundThis();

    // We need to ask the linker services for a delegate invocation on the target callable.

    // Replace arguments (boundCallable[, this], args) => (callable[, boundThis], boundArgs, args) when delegating
    final Object[] args = linkRequest.getArguments();
    final Object[] boundArgs = boundCallable.getBoundArgs();
    final int argsLen = args.length;
    final int boundArgsLen = boundArgs.length;
    final Object[] newArgs = new Object[argsLen + boundArgsLen];
    newArgs[0] = callable;
    final int firstArgIndex;
    if (isCall) {
        newArgs[1] = boundThis;
        firstArgIndex = 2;
    } else {
        firstArgIndex = 1;
    }
    System.arraycopy(boundArgs, 0, newArgs, firstArgIndex, boundArgsLen);
    System.arraycopy(args, firstArgIndex, newArgs, firstArgIndex + boundArgsLen, argsLen - firstArgIndex);

    // Use R(T0, T1, T2, ...) => R(callable.class, boundThis.class, boundArg0.class, ..., boundArgn.class, T2, ...)
    // call site type when delegating to underlying linker (for dyn:new, there's no this).
    final MethodType type = descriptor.getMethodType();
    // Use R(T0, ...) => R(callable.class, ...)
    MethodType newMethodType = descriptor.getMethodType().changeParameterType(0, callable.getClass());
    if (isCall) {
        // R(callable.class, T1, ...) => R(callable.class, boundThis.class, ...)
        newMethodType = newMethodType.changeParameterType(1, boundThis == null? Object.class : boundThis.getClass());
    }
    // R(callable.class[, boundThis.class], T2, ...) => R(callable.class[, boundThis.class], boundArg0.class, ..., boundArgn.class, T2, ...)
    for(int i = boundArgs.length; i-- > 0;) {
        newMethodType = newMethodType.insertParameterTypes(firstArgIndex, boundArgs[i] == null ? Object.class : boundArgs[i].getClass());
    }
    final CallSiteDescriptor newDescriptor = descriptor.changeMethodType(newMethodType);

    // Delegate to target's linker
    final GuardedInvocation inv = linkerServices.getGuardedInvocation(linkRequest.replaceArguments(newDescriptor, newArgs));
    if(inv == null) {
        return null;
    }

    // Bind (callable[, boundThis], boundArgs) to the delegate handle
    final MethodHandle boundHandle = MethodHandles.insertArguments(inv.getInvocation(), 0,
            Arrays.copyOf(newArgs, firstArgIndex + boundArgs.length));
    final Class<?> p0Type = type.parameterType(0);
    final MethodHandle droppingHandle;
    if (isCall) {
        // Ignore incoming boundCallable and this
        droppingHandle = MethodHandles.dropArguments(boundHandle, 0, p0Type, type.parameterType(1));
    } else {
        // Ignore incoming boundCallable
        droppingHandle = MethodHandles.dropArguments(boundHandle, 0, p0Type);
    }
    // Identity guard on boundCallable object
    final MethodHandle newGuard = Guards.getIdentityGuard(boundCallable);
    return inv.replaceMethods(droppingHandle, newGuard.asType(newGuard.type().changeParameterType(0, p0Type)));
}
 

@Override
public GuardedInvocation getGuardedInvocation(LinkRequest linkRequest, LinkerServices linkerServices) throws Exception {
    final Object objBoundDynamicMethod = linkRequest.getReceiver();
    if(!(objBoundDynamicMethod instanceof BoundDynamicMethod)) {
        return null;
    }

    final BoundDynamicMethod boundDynamicMethod = (BoundDynamicMethod)objBoundDynamicMethod;
    final Object dynamicMethod = boundDynamicMethod.getDynamicMethod();
    final Object boundThis = boundDynamicMethod.getBoundThis();

    // Replace arguments (boundDynamicMethod, this, ...) => (dynamicMethod, boundThis, ...) when delegating to
    // BeansLinker
    final Object[] args = linkRequest.getArguments();
    args[0] = dynamicMethod;
    args[1] = boundThis;

    // Use R(T0, T1, ...) => R(dynamicMethod.class, boundThis.class, ...) call site type when delegating to
    // BeansLinker.
    final CallSiteDescriptor descriptor = linkRequest.getCallSiteDescriptor();
    final MethodType type = descriptor.getMethodType();
    final Class<?> dynamicMethodClass = dynamicMethod.getClass();
    final CallSiteDescriptor newDescriptor = descriptor.changeMethodType(
            type.changeParameterType(0, dynamicMethodClass).changeParameterType(1, boundThis.getClass()));

    // Delegate to BeansLinker
    final GuardedInvocation inv = NashornBeansLinker.getGuardedInvocation(BeansLinker.getLinkerForClass(dynamicMethodClass),
            linkRequest.replaceArguments(newDescriptor, args), linkerServices);
    if(inv == null) {
        return null;
    }

    // Bind (dynamicMethod, boundThis) to the handle
    final MethodHandle boundHandle = MethodHandles.insertArguments(inv.getInvocation(), 0, dynamicMethod, boundThis);
    final Class<?> p0Type = type.parameterType(0);
    // Ignore incoming (boundDynamicMethod, this)
    final MethodHandle droppingHandle = MethodHandles.dropArguments(boundHandle, 0, p0Type, type.parameterType(1));
    // Identity guard on boundDynamicMethod object
    final MethodHandle newGuard = Guards.getIdentityGuard(boundDynamicMethod);

    return inv.replaceMethods(droppingHandle, newGuard.asType(newGuard.type().changeParameterType(0, p0Type)));
}
 

@Override
public GuardedInvocation getGuardedInvocation(final LinkRequest linkRequest, final LinkerServices linkerServices) throws Exception {
    final Object objBoundCallable = linkRequest.getReceiver();
    if(!(objBoundCallable instanceof BoundCallable)) {
        return null;
    }

    final CallSiteDescriptor descriptor = linkRequest.getCallSiteDescriptor();
    if (descriptor.getNameTokenCount() < 2 || !"dyn".equals(descriptor.getNameToken(CallSiteDescriptor.SCHEME))) {
        return null;
    }
    final String operation = descriptor.getNameToken(CallSiteDescriptor.OPERATOR);
    // We need to distinguish "dyn:new" from "dyn:call" because "dyn:call" sites have parameter list of the form
    // "callee, this, args", while "dyn:call" sites have "callee, args" -- they lack the "this" parameter.
    final boolean isCall;
    if ("new".equals(operation)) {
        isCall = false;
    } else if ("call".equals(operation)) {
        isCall = true;
    } else {
        // Only dyn:call and dyn:new are supported.
        return null;
    }
    final BoundCallable boundCallable = (BoundCallable)objBoundCallable;
    final Object callable = boundCallable.getCallable();
    final Object boundThis = boundCallable.getBoundThis();

    // We need to ask the linker services for a delegate invocation on the target callable.

    // Replace arguments (boundCallable[, this], args) => (callable[, boundThis], boundArgs, args) when delegating
    final Object[] args = linkRequest.getArguments();
    final Object[] boundArgs = boundCallable.getBoundArgs();
    final int argsLen = args.length;
    final int boundArgsLen = boundArgs.length;
    final Object[] newArgs = new Object[argsLen + boundArgsLen];
    newArgs[0] = callable;
    final int firstArgIndex;
    if (isCall) {
        newArgs[1] = boundThis;
        firstArgIndex = 2;
    } else {
        firstArgIndex = 1;
    }
    System.arraycopy(boundArgs, 0, newArgs, firstArgIndex, boundArgsLen);
    System.arraycopy(args, firstArgIndex, newArgs, firstArgIndex + boundArgsLen, argsLen - firstArgIndex);

    // Use R(T0, T1, T2, ...) => R(callable.class, boundThis.class, boundArg0.class, ..., boundArgn.class, T2, ...)
    // call site type when delegating to underlying linker (for dyn:new, there's no this).
    final MethodType type = descriptor.getMethodType();
    // Use R(T0, ...) => R(callable.class, ...)
    MethodType newMethodType = descriptor.getMethodType().changeParameterType(0, callable.getClass());
    if (isCall) {
        // R(callable.class, T1, ...) => R(callable.class, boundThis.class, ...)
        newMethodType = newMethodType.changeParameterType(1, boundThis == null? Object.class : boundThis.getClass());
    }
    // R(callable.class[, boundThis.class], T2, ...) => R(callable.class[, boundThis.class], boundArg0.class, ..., boundArgn.class, T2, ...)
    for(int i = boundArgs.length; i-- > 0;) {
        newMethodType = newMethodType.insertParameterTypes(firstArgIndex, boundArgs[i] == null ? Object.class : boundArgs[i].getClass());
    }
    final CallSiteDescriptor newDescriptor = descriptor.changeMethodType(newMethodType);

    // Delegate to target's linker
    final GuardedInvocation inv = linkerServices.getGuardedInvocation(linkRequest.replaceArguments(newDescriptor, newArgs));
    if(inv == null) {
        return null;
    }

    // Bind (callable[, boundThis], boundArgs) to the delegate handle
    final MethodHandle boundHandle = MethodHandles.insertArguments(inv.getInvocation(), 0,
            Arrays.copyOf(newArgs, firstArgIndex + boundArgs.length));
    final Class<?> p0Type = type.parameterType(0);
    final MethodHandle droppingHandle;
    if (isCall) {
        // Ignore incoming boundCallable and this
        droppingHandle = MethodHandles.dropArguments(boundHandle, 0, p0Type, type.parameterType(1));
    } else {
        // Ignore incoming boundCallable
        droppingHandle = MethodHandles.dropArguments(boundHandle, 0, p0Type);
    }
    // Identity guard on boundCallable object
    final MethodHandle newGuard = Guards.getIdentityGuard(boundCallable);
    return inv.replaceMethods(droppingHandle, newGuard.asType(newGuard.type().changeParameterType(0, p0Type)));
}
 

@Override
public GuardedInvocation getGuardedInvocation(LinkRequest linkRequest, LinkerServices linkerServices) throws Exception {
    final Object objBoundDynamicMethod = linkRequest.getReceiver();
    if(!(objBoundDynamicMethod instanceof BoundDynamicMethod)) {
        return null;
    }

    final BoundDynamicMethod boundDynamicMethod = (BoundDynamicMethod)objBoundDynamicMethod;
    final Object dynamicMethod = boundDynamicMethod.getDynamicMethod();
    final Object boundThis = boundDynamicMethod.getBoundThis();

    // Replace arguments (boundDynamicMethod, this, ...) => (dynamicMethod, boundThis, ...) when delegating to
    // BeansLinker
    final Object[] args = linkRequest.getArguments();
    args[0] = dynamicMethod;
    args[1] = boundThis;

    // Use R(T0, T1, ...) => R(dynamicMethod.class, boundThis.class, ...) call site type when delegating to
    // BeansLinker.
    final CallSiteDescriptor descriptor = linkRequest.getCallSiteDescriptor();
    final MethodType type = descriptor.getMethodType();
    final Class<?> dynamicMethodClass = dynamicMethod.getClass();
    final CallSiteDescriptor newDescriptor = descriptor.changeMethodType(
            type.changeParameterType(0, dynamicMethodClass).changeParameterType(1, boundThis.getClass()));

    // Delegate to BeansLinker
    final GuardedInvocation inv = NashornBeansLinker.getGuardedInvocation(BeansLinker.getLinkerForClass(dynamicMethodClass),
            linkRequest.replaceArguments(newDescriptor, args), linkerServices);
    if(inv == null) {
        return null;
    }

    // Bind (dynamicMethod, boundThis) to the handle
    final MethodHandle boundHandle = MethodHandles.insertArguments(inv.getInvocation(), 0, dynamicMethod, boundThis);
    final Class<?> p0Type = type.parameterType(0);
    // Ignore incoming (boundDynamicMethod, this)
    final MethodHandle droppingHandle = MethodHandles.dropArguments(boundHandle, 0, p0Type, type.parameterType(1));
    // Identity guard on boundDynamicMethod object
    final MethodHandle newGuard = Guards.getIdentityGuard(boundDynamicMethod);

    return inv.replaceMethods(droppingHandle, newGuard.asType(newGuard.type().changeParameterType(0, p0Type)));
}
 

/**
 * Returns a new call site descriptor that is identical to the passed one, except that it has additional parameter
 * types inserted into its method type.
 * @param desc the original call site descriptor
 * @param num index at which the new parameters are inserted
 * @param ptypesToInsert the new types to insert
 * @return a new call site descriptor with modified method type
 */
public static CallSiteDescriptor insertParameterTypes(final CallSiteDescriptor desc, final int num, final Class<?>... ptypesToInsert) {
    return desc.changeMethodType(desc.getMethodType().insertParameterTypes(num, ptypesToInsert));
}
 

/**
 * Returns a new call site descriptor that is identical to the passed one, except that it has a single parameter
 * type changed in its method type.
 * @param desc the original call site descriptor
 * @param num index of the parameter to change
 * @param nptype the new parameter type
 * @return a new call site descriptor with modified method type
 */
public static CallSiteDescriptor changeParameterType(CallSiteDescriptor desc, int num, Class<?> nptype) {
    return desc.changeMethodType(desc.getMethodType().changeParameterType(num, nptype));
}
 

/**
 * Returns a new call site descriptor that is identical to the passed one, except that it has additional parameter
 * types inserted into its method type.
 * @param desc the original call site descriptor
 * @param num index at which the new parameters are inserted
 * @param ptypesToInsert the new types to insert
 * @return a new call site descriptor with modified method type
 */
public static CallSiteDescriptor insertParameterTypes(final CallSiteDescriptor desc, final int num, final List<Class<?>> ptypesToInsert) {
    return desc.changeMethodType(desc.getMethodType().insertParameterTypes(num, ptypesToInsert));
}
 

/**
 * Returns a new call site descriptor that is identical to the passed one, except that it has additional parameter
 * types inserted into its method type.
 * @param desc the original call site descriptor
 * @param num index at which the new parameters are inserted
 * @param ptypesToInsert the new types to insert
 * @return a new call site descriptor with modified method type
 */
public static CallSiteDescriptor insertParameterTypes(CallSiteDescriptor desc, int num, Class<?>... ptypesToInsert) {
    return desc.changeMethodType(desc.getMethodType().insertParameterTypes(num, ptypesToInsert));
}
 

/**
 * Returns a new call site descriptor that is identical to the passed one, except that it has some parameter types
 * removed from its method type.
 * @param desc the original call site descriptor
 * @param start index of the first parameter to remove
 * @param end index of the first parameter to not remove
 * @return a new call site descriptor with modified method type
 */
public static CallSiteDescriptor dropParameterTypes(final CallSiteDescriptor desc, final int start, final int end) {
    return desc.changeMethodType(desc.getMethodType().dropParameterTypes(start, end));
}
 

/**
 * Returns a new call site descriptor that is identical to the passed one, except that it has some parameter types
 * removed from its method type.
 * @param desc the original call site descriptor
 * @param start index of the first parameter to remove
 * @param end index of the first parameter to not remove
 * @return a new call site descriptor with modified method type
 */
public static CallSiteDescriptor dropParameterTypes(final CallSiteDescriptor desc, final int start, final int end) {
    return desc.changeMethodType(desc.getMethodType().dropParameterTypes(start, end));
}
 

/**
 * Returns a new call site descriptor that is identical to the passed one, except that it has the return type
 * changed in its method type.
 * @param desc the original call site descriptor
 * @param nrtype the new return type
 * @return a new call site descriptor with modified method type
 */
public static CallSiteDescriptor changeReturnType(final CallSiteDescriptor desc, final Class<?> nrtype) {
    return desc.changeMethodType(desc.getMethodType().changeReturnType(nrtype));
}
 

/**
 * Returns a new call site descriptor that is identical to the passed one, except that it has some parameter types
 * removed from its method type.
 * @param desc the original call site descriptor
 * @param start index of the first parameter to remove
 * @param end index of the first parameter to not remove
 * @return a new call site descriptor with modified method type
 */
public static CallSiteDescriptor dropParameterTypes(CallSiteDescriptor desc, int start, int end) {
    return desc.changeMethodType(desc.getMethodType().dropParameterTypes(start, end));
}
 

/**
 * Returns a new call site descriptor that is identical to the passed one, except that it has additional parameter
 * types inserted into its method type.
 * @param desc the original call site descriptor
 * @param num index at which the new parameters are inserted
 * @param ptypesToInsert the new types to insert
 * @return a new call site descriptor with modified method type
 */
public static CallSiteDescriptor insertParameterTypes(final CallSiteDescriptor desc, final int num, final List<Class<?>> ptypesToInsert) {
    return desc.changeMethodType(desc.getMethodType().insertParameterTypes(num, ptypesToInsert));
}
 

/**
 * Returns a new call site descriptor that is identical to the passed one, except that it has additional parameter
 * types inserted into its method type.
 * @param desc the original call site descriptor
 * @param num index at which the new parameters are inserted
 * @param ptypesToInsert the new types to insert
 * @return a new call site descriptor with modified method type
 */
public static CallSiteDescriptor insertParameterTypes(final CallSiteDescriptor desc, final int num, final Class<?>... ptypesToInsert) {
    return desc.changeMethodType(desc.getMethodType().insertParameterTypes(num, ptypesToInsert));
}
 

/**
 * Returns a new call site descriptor that is identical to the passed one, except that it has additional parameter
 * types inserted into its method type.
 * @param desc the original call site descriptor
 * @param num index at which the new parameters are inserted
 * @param ptypesToInsert the new types to insert
 * @return a new call site descriptor with modified method type
 */
public static CallSiteDescriptor insertParameterTypes(final CallSiteDescriptor desc, final int num, final Class<?>... ptypesToInsert) {
    return desc.changeMethodType(desc.getMethodType().insertParameterTypes(num, ptypesToInsert));
}
 

/**
 * Returns a new call site descriptor that is identical to the passed one, except that it has additional parameter
 * types inserted into its method type.
 * @param desc the original call site descriptor
 * @param num index at which the new parameters are inserted
 * @param ptypesToInsert the new types to insert
 * @return a new call site descriptor with modified method type
 */
public static CallSiteDescriptor insertParameterTypes(CallSiteDescriptor desc, int num, Class<?>... ptypesToInsert) {
    return desc.changeMethodType(desc.getMethodType().insertParameterTypes(num, ptypesToInsert));
}
 

/**
 * Returns a new call site descriptor that is identical to the passed one, except that it has a single parameter
 * type changed in its method type.
 * @param desc the original call site descriptor
 * @param num index of the parameter to change
 * @param nptype the new parameter type
 * @return a new call site descriptor with modified method type
 */
public static CallSiteDescriptor changeParameterType(CallSiteDescriptor desc, int num, Class<?> nptype) {
    return desc.changeMethodType(desc.getMethodType().changeParameterType(num, nptype));
}