/**
* Returns a class which has a static method with the same name as 'method', whose body creates an
* new instance of 'specimen', casts it to 'iface' (including the type parameters) and invokes
* 'method' upon it via an invokeinterface instruction with 'args' as function call parameters.
*/
private Class invokeInterfaceHarness(
Class specimen, Extends iface, AbstractMethod method, String... args) {
Interface istub =
new Interface(
iface.getType().getName(),
iface.getType().getAccessFlags(),
iface.getType().getParameters(),
null,
Arrays.asList((Method) method));
Class cstub = new Class(specimen.getName());
String params = toJoinedString(args, ", ");
ConcreteMethod sm =
new ConcreteMethod(
"int",
SourceModel.stdMethodName,
String.format(
"return ((%s)(new %s())).%s(%s);",
iface.toString(), specimen.getName(), method.getName(), params),
new AccessFlag("public"),
new AccessFlag("static"));
sm.suppressWarnings();
Class ii = new Class("II_" + specimen.getName() + "_" + iface.getType().getName(), sm);
ii.addCompilationDependency(istub);
ii.addCompilationDependency(cstub);
ii.addCompilationDependency(method);
return ii;
}
/**
* Creates a class which calls target::method(args) via invokeinterface through 'iface', compiles
* and loads both it and 'target', and then invokes the method. If the returned value does not
* match 'value' then a test failure is indicated.
*/
public void assertInvokeInterfaceEquals(
Object value, Class target, Extends iface, AbstractMethod method, String... args) {
Compiler compiler = compilerLocal.get();
compiler.setFlags(compilerFlags());
Class ii = invokeInterfaceHarness(target, iface, method, args);
ClassLoader loader = compiler.compile(ii, target);
assertStaticCallEquals(loader, ii, method.getName(), value);
compiler.cleanup();
}