/**
* Returns a class which has a static method with the same name as 'method', whose body creates an
* new instance of 'specimen' and invokes 'method' upon it via an invokevirtual instruction with
* 'args' as function call parameters.
*
* <p>'returns' is a dummy return value that need only match 'methods' return type (it is only
* used in the dummy class when compiling IV).
*/
private Class invokeVirtualHarness(
Class specimen, ConcreteMethod method, String returns, String... args) {
Method cm =
new ConcreteMethod(
method.getReturnType(),
method.getName(),
"return " + returns + ";",
method.getElements());
Class stub = new Class(specimen.getName(), cm);
String params = toJoinedString(args, ", ");
ConcreteMethod sm =
new ConcreteMethod(
method.getReturnType(),
method.getName(),
String.format(
"return (new %s()).%s(%s);", specimen.getName(), method.getName(), params),
new AccessFlag("public"),
new AccessFlag("static"));
Class iv = new Class("IV_" + specimen.getName(), sm);
iv.addCompilationDependency(stub);
iv.addCompilationDependency(cm);
return iv;
}
/**
* Creates a class which calls target::method(args) via invokevirtual, compiles and loads both the
* new class and 'target', and then invokes the method. If the returned value does not match
* 'value' then a test failure is indicated.
*/
public void assertInvokeVirtualEquals(
Object value, Class target, ConcreteMethod method, String returns, String... args) {
Compiler compiler = compilerLocal.get();
compiler.setFlags(compilerFlags());
Class iv = invokeVirtualHarness(target, method, returns, args);
ClassLoader loader = compiler.compile(iv, target);
assertStaticCallEquals(loader, iv, method.getName(), value);
compiler.cleanup();
}
/**
* Creates a class which calls target::method(args) via invokevirtual, compiles and loads both the
* new class and 'target', and then invokes the method. If an exception of type 'exceptionType' is
* not thrown, then a test failure is indicated.
*/
public void assertThrows(
java.lang.Class<?> exceptionType,
Class target,
ConcreteMethod method,
String returns,
String... args) {
Compiler compiler = compilerLocal.get();
compiler.setFlags(compilerFlags());
Class iv = invokeVirtualHarness(target, method, returns, args);
ClassLoader loader = compiler.compile(iv, target);
java.lang.Class<?> cls = null;
try {
cls = java.lang.Class.forName(iv.getName(), true, loader);
} catch (ClassNotFoundException e) {
}
assertNotNull(cls);
java.lang.reflect.Method m = null;
try {
m = cls.getMethod(method.getName());
} catch (NoSuchMethodException e) {
}
assertNotNull(m);
try {
m.invoke(null);
fail("Exception should have been thrown");
} catch (InvocationTargetException | IllegalAccessException e) {
if (verboseLocal.get() == Boolean.TRUE) {
System.out.println(e.getCause());
}
assertTrue(exceptionType.isAssignableFrom(e.getCause().getClass()));
}
compiler.cleanup();
}
