/**
* 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;
}
/**
* 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;
}
/**
* Uses 'loader' to load class 'clzz', and calls the static method 'method'. If the return value
* does not equal 'value' (or if an exception is thrown), then a test failure is indicated.
*
* <p>If 'value' is null, then no equality check is performed -- the assertion fails only if an
* exception is thrown.
*/
protected void assertStaticCallEquals(
ClassLoader loader, Class clzz, String method, Object value) {
java.lang.Class<?> cls = null;
try {
cls = java.lang.Class.forName(clzz.getName(), true, loader);
} catch (ClassNotFoundException e) {
}
assertNotNull(cls);
java.lang.reflect.Method m = null;
try {
m = cls.getMethod(method);
} catch (NoSuchMethodException e) {
}
assertNotNull(m);
try {
Object res = m.invoke(null);
assertNotNull(res);
if (value != null) {
assertEquals(res, value);
}
} catch (InvocationTargetException | IllegalAccessException e) {
fail("Unexpected exception thrown: " + e.getCause(), e.getCause());
}
}
/**
* 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();
}