C++ rvmExceptionCheck函数代码示例

static void wrapClassNotFoundException(Env* env, const char* className) {
    Object* exception = rvmExceptionOccurred(env);
    if (exception && exception->clazz == java_lang_ClassNotFoundException) {
        // If ClassNotFoundException is thrown we have to wrap it in a NoClassDefFoundError
        exception = rvmExceptionClear(env);
        Method* constructor = rvmGetInstanceMethod(env, java_lang_NoClassDefFoundError, "<init>", "(Ljava/lang/String;)V");
        if (!constructor) return;
        Object* message = rvmNewStringUTF(env, className, -1);
        if (!message) return;
        Object* wrappedException = rvmNewObject(env, java_lang_NoClassDefFoundError, constructor, message);
        if (!wrappedException) return;
        Class* java_lang_StackTraceElement = rvmFindClassUsingLoader(env, "java/lang/StackTraceElement", NULL);
        if (!java_lang_StackTraceElement) return;
        ObjectArray* stackTrace = rvmNewObjectArray(env, 0, java_lang_StackTraceElement, NULL, NULL);
        if (!stackTrace) return;
        Method* setStackTrace = rvmGetInstanceMethod(env, java_lang_Throwable, "setStackTrace", "([Ljava/lang/StackTraceElement;)V");
        if (!setStackTrace) return;
        rvmCallVoidInstanceMethod(env, wrappedException, setStackTrace, stackTrace);
        if (rvmExceptionCheck(env)) return;
        Method* initCause = rvmGetInstanceMethod(env, java_lang_NoClassDefFoundError, "initCause", "(Ljava/lang/Throwable;)Ljava/lang/Throwable;");
        if (!initCause) return;
        rvmCallObjectInstanceMethod(env, wrappedException, initCause, exception);
        if (!rvmExceptionCheck(env)) rvmThrow(env, wrappedException);
    }
}

void _bcSetObjectArrayElement(Env* env, ObjectArray* array, jint index, Object* value) {
    if (!value) {
        array->values[index] = value;
        return;        
    }
    ENTER;
    Class* componentType = array->object.clazz->componentType;
    jboolean assignable = rvmIsAssignableFrom(env, value->clazz, componentType);
    if (!rvmExceptionCheck(env) && !assignable) {
        rvmThrowArrayStoreException(env, value->clazz, array->object.clazz);
    }
    if (!rvmExceptionCheck(env)) array->values[index] = value;
    LEAVEV;
}

/**
 * Implements all abstract methods in {@code proxyClass}. This should be called after
 * {@link #addProxyMethods()} which will override all methods defined by the proxy's
 * ancestor classes (abstract or concrete).
 */
static jboolean implementAbstractInterfaceMethods(Env* env, Class* proxyClass, Interface* interface, ProxyClassData* proxyClassData) {
    if (!interface) return TRUE;

    Method* method = rvmGetMethods(env, interface->interface);
    if (rvmExceptionOccurred(env)) return FALSE;
    for (; method != NULL; method = method->next) {
        if (!METHOD_IS_CLASS_INITIALIZER(method)) {
            ProxyMethod* proxyMethod = hasMethod(env, proxyClass, method->name, method->desc);
            if (rvmExceptionOccurred(env)) return FALSE;
            if (!proxyMethod) { 
                jint access = (method->access & (~ACC_ABSTRACT)) | ACC_FINAL;
                proxyMethod = addProxyMethod(env, proxyClass, method, access, _proxy0);
                if (!proxyMethod) return FALSE;
            }
            // Record the lookup function in proxyClassData
            LookupEntry* entry = rvmAllocateMemory(env, sizeof(LookupEntry));
            if (!entry) return FALSE;
            entry->key.name = method->name;
            entry->key.desc = method->desc;
            entry->method = proxyMethod;
            HASH_ADD(hh, proxyClassData->lookupsHash, key, sizeof(LookupKey), entry);
        }
    }

    if (!implementAbstractInterfaceMethods(env, proxyClass, interface->next, proxyClassData)) return FALSE;
    Interface* interfaceInterfaces = rvmGetInterfaces(env, interface->interface);
    if (rvmExceptionCheck(env)) return FALSE;
    if (!implementAbstractInterfaceMethods(env, proxyClass, interfaceInterfaces, proxyClassData)) return FALSE;

    return TRUE;
}

static jboolean getRuntimeVisibleAnnotationsIterator(Env* env, jbyte type, void* attributes, void* data) {
    ObjectArray** result = (ObjectArray**) ((void**) data)[0];
    Object* classLoader = (Object*) ((void**) data)[1];
    if (type == RUNTIME_VISIBLE_ANNOTATIONS) {
        jint length = getInt(&attributes);
        ObjectArray* annotations = rvmNewObjectArray(env, length, java_lang_annotation_Annotation, NULL, NULL);
        if (!annotations) return FALSE;
        jint i = 0;
        jint actualLength = 0;
        for (i = 0; i < length; i++) {
            jvalue value = {0};
            if (getAnnotationValue(env, &attributes, NULL, classLoader, &value, TRUE)) {
                annotations->values[actualLength++] = (Object*) value.l;
            } else if (rvmExceptionCheck(env)) {
                return FALSE;
            }
        }
        if (actualLength != length) {
            // One or more annotations could not be loaded due to a missing class.
            // Reallocate the result array and copy over the non null values.
            ObjectArray* annotations2 = rvmNewObjectArray(env, actualLength, java_lang_annotation_Annotation, NULL, NULL);
            if (!annotations2) return FALSE;
            memcpy(annotations2->values, annotations->values, actualLength * sizeof(Object*));
            annotations = annotations2;
        }
        *result = annotations;
        return FALSE; // Stop iterating
    }
    return TRUE; // Continue with next attribute
}

void* lookupInterfaceMethod(Env* env, ClassInfoHeader* header, Object* thiz, char* name, char* desc) {
    initializeClass(env, header);
    if (rvmExceptionCheck(env)) return NULL;
    Class* ownerInterface = header->clazz;
    if (!rvmIsInstanceOf(env, thiz, ownerInterface)) {
        char message[256];
        snprintf(message, 256, "Class %s does not implement the requested interface %s", 
            rvmToBinaryClassName(env, thiz->clazz->name), rvmToBinaryClassName(env, ownerInterface->name));
        rvmThrowIncompatibleClassChangeError(env, message);
        return NULL;
    }
    Method* method = rvmGetInstanceMethod(env, thiz->clazz, name, desc);
    Object* throwable = rvmExceptionClear(env);
    if (!method && throwable->clazz != java_lang_NoSuchMethodError) { 
        rvmThrow(env, throwable);
        return NULL;
    }
    if (!method || METHOD_IS_ABSTRACT(method)) {
        rvmThrowAbstractMethodError(env, ""); // TODO: Message
        return NULL;
    }
    if (!METHOD_IS_PUBLIC(method)) {
        rvmThrowIllegalAccessError(env, ""); // TODO: Message
        return NULL;
    }
    return method->synchronizedImpl ? method->synchronizedImpl : method->impl;
}

Class* rvmProxyCreateProxyClass(Env* env, Class* superclass, ClassLoader* classLoader, char* className, jint interfacesCount, Class** interfaces, 
        jint instanceDataSize, jint instanceDataOffset, unsigned short instanceRefCount, ProxyHandler handler) {

    // Allocate the proxy class.
    Class* proxyClass = rvmAllocateClass(env, className, superclass, classLoader, CLASS_TYPE_PROXY | ACC_PUBLIC | ACC_FINAL, 
        offsetof(Class, data) + sizeof(ProxyClassData), instanceDataSize, instanceDataOffset, 1, instanceRefCount, NULL, NULL);
    if (!proxyClass) return NULL;

    ProxyClassData* proxyClassData = (ProxyClassData*) proxyClass->data;
    proxyClassData->handler = handler;

    // Add interfaces
    jint i;
    for (i = 0; i < interfacesCount; i++) {
        if (!rvmAddInterface(env, proxyClass, (Class*) interfaces[i])) return NULL;
    }

    // Initialize methods to NULL to prevent rvmGetMethods() from trying to load the methods if called with this proxy class
    proxyClass->_methods = NULL;

    Class* c = proxyClass;
    while (c) {
        Interface* interface = rvmGetInterfaces(env, c);
        if (rvmExceptionCheck(env)) return NULL;
        if (!implementAbstractInterfaceMethods(env, proxyClass, interface, proxyClassData)) return NULL;
        c = c->superclass;
    }

    if (!addProxyMethods(env, proxyClass, superclass, proxyClassData)) return NULL;

    if (!rvmRegisterClass(env, proxyClass)) return NULL;

    return proxyClass;
}

Class* Java_java_lang_Class_classForName(Env* env, Class* cls, Object* className, jboolean initializeBoolean,
            ClassLoader* classLoader) {

    if (!className) {
        rvmThrowNullPointerException(env);
        return NULL;
    }
    char* classNameUTF = toBinaryName(env, className);
    if (!classNameUTF) return NULL;
    Class* clazz = rvmFindClassUsingLoader(env, classNameUTF, classLoader);
    if (!clazz) {
        char* p = classNameUTF;
        while (*p != '\0') {
            if (*p == '/') *p = '.';
            p++;
        }
        WARNF("Class.forName() failed to load '%s'. "
              "Use the -forcelinkclasses command line option "
              "or add <forceLinkClasses><pattern>%s</pattern></forceLinkClasses> "
              "to your robovm.xml file to link it in.",
              classNameUTF, classNameUTF);
        return NULL;
    }
    if (initializeBoolean) {
        rvmInitialize(env, clazz);
        if (rvmExceptionCheck(env)) return NULL;
    }
    return clazz;
}

ObjectArray* Java_java_lang_Class_getDeclaredFields0(Env* env, Class* clazz, jboolean publicOnly) {
    if (CLASS_IS_PRIMITIVE(clazz) || CLASS_IS_ARRAY(clazz)) return NULL;

    Field* fields = rvmGetFields(env, clazz);
    if (rvmExceptionCheck(env)) return NULL;

    Field* field;
    jint length = 0;
    for (field = fields; field != NULL; field = field->next) {
        if (!publicOnly || FIELD_IS_PUBLIC(field)) {
            length++;
        }
    }

    ObjectArray* result = NULL;
    jint i = 0;
    for (field = fields; field != NULL; field = field->next) {
        if (!publicOnly || FIELD_IS_PUBLIC(field)) {
            Object* c = createFieldObject(env, field);
            if (!c) return NULL;
            if (!result) {
                result = rvmNewObjectArray(env, length, c->clazz, NULL, NULL);
                if (!result) return NULL;
            }
            result->values[i++] = c;
        }
    }

    return result;
}

ObjectArray* Java_java_lang_Class_getDeclaredMethods0(Env* env, Class* clazz, jboolean publicOnly) {
    if (CLASS_IS_PRIMITIVE(clazz) || CLASS_IS_ARRAY(clazz)) return NULL;

    Method* methods = rvmGetMethods(env, clazz);
    if (rvmExceptionCheck(env)) return NULL;

    Method* method;
    jint length = 0;
    for (method = methods; method != NULL; method = method->next) {
        if (!METHOD_IS_CONSTRUCTOR(method) && !METHOD_IS_CLASS_INITIALIZER(method)) {
            if (!publicOnly || METHOD_IS_PUBLIC(method)) {
                length++;
            }
        }
    }

    ObjectArray* result = NULL;
    jint i = 0;
    for (method = methods; method != NULL; method = method->next) {
        if (!METHOD_IS_CONSTRUCTOR(method) && !METHOD_IS_CLASS_INITIALIZER(method)) {
            if (!publicOnly || METHOD_IS_PUBLIC(method)) {
                Object* c = createMethodObject(env, method);
                if (!c) return NULL;
                if (!result) {
                    result = rvmNewObjectArray(env, length, c->clazz, NULL, NULL);
                    if (!result) return NULL;
                }
                result->values[i++] = c;
            }
        }
    }

    return result;
}

Method* rvmGetMethods(Env* env, Class* clazz) {
    if (clazz->_methods != &METHODS_NOT_LOADED) return clazz->_methods;

    // TODO: Double checked locking
    obtainClassLock();
    if (clazz->_methods == &METHODS_NOT_LOADED) {
        env->vm->options->loadMethods(env, clazz);
        if (clazz->_methods == &METHODS_NOT_LOADED) {
            // The class has no methods
            clazz->_methods = NULL;
        }
    }
    if (rvmExceptionCheck(env)) clazz->_methods = &METHODS_NOT_LOADED;
    releaseClassLock();
    if (rvmExceptionCheck(env)) return NULL;
    return clazz->_methods;
}

Interface* rvmGetInterfaces(Env* env, Class* clazz) {
    if (clazz->_interfaces != &INTERFACES_NOT_LOADED) return clazz->_interfaces;

    // TODO: Double checked locking
    obtainClassLock();
    if (clazz->_interfaces == &INTERFACES_NOT_LOADED) {
        env->vm->options->loadInterfaces(env, clazz);
        if (clazz->_interfaces == &INTERFACES_NOT_LOADED) {
            // The class has no interfaces
            clazz->_interfaces = NULL;
        }
    }
    if (rvmExceptionCheck(env)) clazz->_interfaces = &INTERFACES_NOT_LOADED;
    releaseClassLock();
    if (rvmExceptionCheck(env)) return NULL;
    return clazz->_interfaces;
}

Object* _bcCheckcastArray(Env* env, Class* arrayClass, Object* o) {
    if (!o) return o;
    ENTER;
    jboolean b = rvmIsAssignableFrom(env, o->clazz, arrayClass);
    if (!rvmExceptionCheck(env) && !b) {
        rvmThrowClassCastException(env, arrayClass, o->clazz);
    }
    LEAVE(o);
}

Method* rvmGetMethod(Env* env, Class* clazz, const char* name, const char* desc) {
    Method* method = getMethod(env, clazz, name, desc);
    if (rvmExceptionCheck(env)) return NULL;
    if (!method) {
        rvmThrowNoSuchMethodError(env, name);
        return NULL;
    }
    return method;
}

static Method* findMethod(Env* env, Class* clazz, const char* name, const char* desc) {
    Method* method = rvmGetMethods(env, clazz);
    if (rvmExceptionCheck(env)) return NULL;
    for (; method != NULL; method = method->next) {
        if (!strcmp(method->name, name) && !strcmp(method->desc, desc)) {
            return method;
        }
    }
    return NULL;
}

Object* _bcLdcArrayClass(Env* env, Class** arrayClassPtr, char* name) {
    Class* arrayClass = *arrayClassPtr;
    if (arrayClass) return (Object*) arrayClass;
    ENTER;
    arrayClass = rvmFindClassUsingLoader(env, name, systemClassLoader);
    wrapClassNotFoundException(env, name);
    if (!rvmExceptionCheck(env)) {
        *arrayClassPtr = arrayClass;
    }
    LEAVE((Object*) arrayClass);
}