C++ rvmFindClassUsingLoader函数代码示例

Class* rvmFindClassByDescriptor(Env* env, const char* desc, ClassLoader* classLoader) {
    switch (desc[0]) {
    case 'Z':
        return prim_Z;
    case 'B':
        return prim_B;
    case 'C':
        return prim_C;
    case 'S':
        return prim_S;
    case 'I':
        return prim_I;
    case 'J':
        return prim_J;
    case 'F':
        return prim_F;
    case 'D':
        return prim_D;
    case 'V':
        return prim_V;
    case '[':
        return rvmFindClassUsingLoader(env, desc, classLoader);
    }
    // desc[0] == 'L'
    jint length = strlen(desc);
    char* className = rvmAllocateMemoryAtomic(env, length - 2 + 1);
    if (!className) return NULL;
    strncpy(className, &desc[1], length - 2);
    return rvmFindClassUsingLoader(env, className, classLoader);
}

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;
}

jboolean rvmInitMethods(Env* env) {
    if (rvmInitMutex(&nativeLibsLock) != 0) {
        return FALSE;
    }
    if (rvmInitMutex(&threadStackTraceLock) != 0) {
        return FALSE;
    }
    java_lang_StackTraceElement = rvmFindClassUsingLoader(env, "java/lang/StackTraceElement", NULL);
    if (!java_lang_StackTraceElement) {
        return FALSE;
    }
    java_lang_StackTraceElement_constructor = rvmGetInstanceMethod(env, java_lang_StackTraceElement, "<init>", 
                                      "(Ljava/lang/Class;Ljava/lang/String;Ljava/lang/String;I)V");
    if (!java_lang_StackTraceElement_constructor) {
        return FALSE;
    }
    empty_java_lang_StackTraceElement_array = rvmNewObjectArray(env, 0, java_lang_StackTraceElement, NULL, NULL);
    if (!empty_java_lang_StackTraceElement_array) {
        return FALSE;
    }
    if (!rvmAddObjectGCRoot(env, (Object*) empty_java_lang_StackTraceElement_array)) {
        return FALSE;
    }

    return TRUE;
}

Object* Java_java_lang_ClassCache_loadReflectionAccess(Env* env, JClass* c) {
    JClass* ao = rvmFindClassUsingLoader(env, "java/lang/reflect/AccessibleObject", NULL);
    if (!ao) return NULL;
    ClassField* f = rvmGetClassField(env, ao, "REFLECTION_ACCESS", "Lorg/robovm/rt/ReflectionAccess;");
    if (!f) return NULL;
    return rvmGetObjectClassFieldValue(env, ao, f);
}

jboolean rvmRun(Env* env) {
    Options* options = env->vm->options;
    Class* clazz = NULL;
    clazz = rvmFindClassUsingLoader(env, options->mainClass, systemClassLoader);
    if (clazz) {
        Method* method = rvmGetClassMethod(env, clazz, "main", "([Ljava/lang/String;)V");
        if (method) {
            ObjectArray* args = rvmNewObjectArray(env, options->commandLineArgsCount, java_lang_String, NULL, NULL);
            if (args) {
                jint i = 0;
                for (i = 0; i < args->length; i++) {
                    // TODO: Don't assume modified UTF-8
                    args->values[i] = rvmNewStringUTF(env, options->commandLineArgs[i], -1);
                    if (!args->values[i]) {
                        args = NULL;
                        break;
                    }
                }
                if (args) rvmCallVoidClassMethod(env, clazz, method, args);
            }
        }
    }

    Object* throwable = rvmExceptionOccurred(env);
    rvmDetachCurrentThread(env->vm, TRUE);
    return throwable == NULL ? TRUE : FALSE;
}

static Interface* loadInterfaces(Env* env, Class* clazz) {
    ClassInfoHeader* header = lookupClassInfo(env, clazz->name, 
        !clazz->classLoader || !clazz->classLoader->parent ? _bcBootClassesHash : _bcClassesHash);
    if (!header) return NULL;

    ClassInfo ci;
    jint i;
    void* p = header;
    readClassInfo(&p, &ci);

    Interface* first = NULL;
    for (i = 0; i < ci.interfaceCount; i++) {
        const char* interfaceName = readInterfaceName(&p);
        Class* interfaceClass = rvmFindClassUsingLoader(env, interfaceName, clazz->classLoader);
        if (!interfaceClass) goto error;
        Interface* interf = rvmAllocateInterface(env, interfaceClass);
        if (!interf) goto error;
        LL_APPEND(first, interf); // Interfaces has to be in the correct order so we need to use the slower LL_APPEND
    }
    return first;
error:
    while (first) {
        Interface* next = first->next;
        rvmFreeMemoryUncollectable(env, first);
        first = next;
    }
    return NULL;
}

jboolean rvmRun(Env* env) {
    Options* options = env->vm->options;
    Class* clazz = NULL;

    rvmHookBeforeAppEntryPoint(env, options->mainClass);
    clazz = rvmFindClassUsingLoader(env, options->mainClass, systemClassLoader);
    if (clazz) {
        Method* method = rvmGetClassMethod(env, clazz, "main", "([Ljava/lang/String;)V");
        if (method) {
            ObjectArray* args = rvmNewObjectArray(env, options->commandLineArgsCount, java_lang_String, NULL, NULL);
            if (args) {
                jint i = 0;
                for (i = 0; i < args->length; i++) {
                    // TODO: Don't assume modified UTF-8
                    args->values[i] = rvmNewStringUTF(env, options->commandLineArgs[i], -1);
                    if (!args->values[i]) {
                        args = NULL;
                        break;
                    }
                }
                if (args) {
                    rvmCallVoidClassMethod(env, clazz, method, args);
                }
            }
        }
    }

    return rvmDestroyVM(env->vm);
}

ClassLoader* rvmGetSystemClassLoader(Env* env) {
    Class* holder = rvmFindClassUsingLoader(env, "java/lang/ClassLoader$SystemClassLoader", NULL);
    if (!holder) return NULL;
    ClassField* field = rvmGetClassField(env, holder, "loader", "Ljava/lang/ClassLoader;");
    if (!field) return NULL;
    return (ClassLoader*) rvmGetObjectClassFieldValue(env, holder, field);
}

static Class* createClass(Env* env, ClassInfoHeader* header, ClassLoader* classLoader) {
    ClassInfo ci;
    void* p = header;
    readClassInfo(&p, &ci);

    Class* superclass = NULL;
    if (ci.superclassName) {
        superclass = rvmFindClassUsingLoader(env, ci.superclassName, classLoader);
        if (!superclass) return NULL;
    }

    rvmObtainClassLock(env);

    Class* clazz = rvmAllocateClass(env, header->className, superclass, classLoader, ci.access, header->typeInfo, header->vitable, header->itables,
            header->classDataSize, header->instanceDataSize, header->instanceDataOffset, header->classRefCount, 
            header->instanceRefCount, ci.attributes, header->initializer);

    if (clazz) {
        if (!rvmRegisterClass(env, clazz)) {
            rvmReleaseClassLock(env);
            return NULL;
        }
        header->clazz = clazz;
        rvmHookClassLoaded(env, clazz, (void*)header);
    }

    rvmReleaseClassLock(env);
    
    return clazz;
}

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);
    }
}

ObjectArray* Java_java_lang_reflect_Method_getExceptionTypes(Env* env, Class* clazz, jlong methodPtr) {
    Method* method = (Method*) LONG_TO_PTR(methodPtr);
    Class* java_lang_reflect_Proxy = rvmFindClassUsingLoader(env, "java/lang/reflect/Proxy", NULL);
    if (method->clazz->superclass == java_lang_reflect_Proxy) {
        return rvmAttributeGetExceptions(env, ((ProxyMethod*) method)->proxiedMethod);
    }
    return rvmAttributeGetExceptions(env, method);
}

static jboolean getDeclaringClassIterator(Env* env, char* innerClass, char* outerClass, char* innerName, jint access, void* data) {
    Class** result = (Class**) ((void**) data)[0];
    Class* clazz = (Class*) ((void**) data)[1];
    if (innerClass && outerClass && !strcmp(innerClass, clazz->name)) {
        *result = rvmFindClassUsingLoader(env, outerClass, clazz->classLoader);
        return FALSE; // Stop iterating
    }
    return TRUE; // Continue with next attribute
}

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);
}

Method* getMethodFromMethodObject(Env* env, Object* methodObject) {
    if (!java_lang_reflect_Method) {
        java_lang_reflect_Method = rvmFindClassUsingLoader(env, "java/lang/reflect/Method", NULL);
        if (!java_lang_reflect_Method) return NULL;
    }
    if (!java_lang_reflect_Method_method) {
        java_lang_reflect_Method_method = rvmGetInstanceField(env, java_lang_reflect_Method, "method", "J");
        if (!java_lang_reflect_Method_method) return NULL;
    }
    return (Method*) LONG_TO_PTR(rvmGetLongInstanceFieldValue(env, methodObject, java_lang_reflect_Method_method));
}

Field* getFieldFromFieldObject(Env* env, Object* fieldObject) {
    if (!java_lang_reflect_Field) {
        java_lang_reflect_Field = rvmFindClassUsingLoader(env, "java/lang/reflect/Field", NULL);
        if (!java_lang_reflect_Field) return NULL;
    }
    if (!java_lang_reflect_Field_field) {
        java_lang_reflect_Field_field = rvmGetInstanceField(env, java_lang_reflect_Field, "field", "J");
        if (!java_lang_reflect_Field_field) return NULL;
    }
    return (Field*) LONG_TO_PTR(rvmGetLongInstanceFieldValue(env, fieldObject, java_lang_reflect_Field_field));
}