@Override
public GuardedInvocation getGuardedInvocation(
final LinkRequest linkRequest, final LinkerServices linkerServices) throws Exception {
final LinkRequest request =
linkRequest.withoutRuntimeContext(); // Nashorn has no runtime context
final Object self = request.getReceiver();
if (self.getClass() != StaticClass.class) {
return null;
}
final Class<?> receiverClass = ((StaticClass) self).getRepresentedClass();
Bootstrap.checkReflectionAccess(receiverClass, true);
final CallSiteDescriptor desc = request.getCallSiteDescriptor();
// We intercept "new" on StaticClass instances to provide additional capabilities
if ("new".equals(desc.getNameToken(CallSiteDescriptor.OPERATOR))) {
if (!Modifier.isPublic(receiverClass.getModifiers())) {
throw ECMAErrors.typeError("new.on.nonpublic.javatype", receiverClass.getName());
}
// make sure new is on accessible Class
Context.checkPackageAccess(receiverClass);
// Is the class abstract? (This includes interfaces.)
if (NashornLinker.isAbstractClass(receiverClass)) {
// Change this link request into a link request on the adapter class.
final Object[] args = request.getArguments();
args[0] =
JavaAdapterFactory.getAdapterClassFor(
new Class<?>[] {receiverClass},
null,
linkRequest.getCallSiteDescriptor().getLookup());
final LinkRequest adapterRequest =
request.replaceArguments(request.getCallSiteDescriptor(), args);
final GuardedInvocation gi =
checkNullConstructor(delegate(linkerServices, adapterRequest), receiverClass);
// Finally, modify the guard to test for the original abstract class.
return gi.replaceMethods(gi.getInvocation(), Guards.getIdentityGuard(self));
}
// If the class was not abstract, just delegate linking to the standard StaticClass linker.
// Make an
// additional check to ensure we have a constructor. We could just fall through to the next
// "return"
// statement, except we also insert a call to checkNullConstructor() which throws an
// ECMAScript TypeError
// with a more intuitive message when no suitable constructor is found.
return checkNullConstructor(delegate(linkerServices, request), receiverClass);
}
// In case this was not a "new" operation, just delegate to the the standard StaticClass linker.
return delegate(linkerServices, request);
}
/**
* Takes a guarded invocation, and ensures its method and guard conform to the type of the call
* descriptor, using all type conversions allowed by the linker's services. This method is used by
* Nashorn's linkers as a last step before returning guarded invocations. Most of the code used to
* produce the guarded invocations does not make an effort to coordinate types of the methods, and
* so a final type adjustment before a guarded invocation is returned to the aggregating linker is
* the responsibility of the linkers themselves.
*
* @param inv the guarded invocation that needs to be type-converted. Can be null.
* @param linkerServices the linker services object providing the type conversions.
* @param desc the call site descriptor to whose method type the invocation needs to conform.
* @return the type-converted guarded invocation. If input is null, null is returned. If the input
* invocation already conforms to the requested type, it is returned unchanged.
*/
static GuardedInvocation asTypeSafeReturn(
final GuardedInvocation inv,
final LinkerServices linkerServices,
final CallSiteDescriptor desc) {
return inv == null ? null : inv.asTypeSafeReturn(linkerServices, desc.getMethodType());
}