Examples with Klass com.oracle.truffle.espresso.impl.Klass used on opensource projects

Example 6 with Klass

use of com.oracle.truffle.espresso.impl.Klass in project graal by oracle.

the class JniEnv method FindClass.

/**
 * <h3>jclass FindClass(JNIEnv *env, const char *name);</h3>
 *
 * <p>
 * FindClass locates the class loader associated with the current native method; that is, the
 * class loader of the class that declared the native method. If the native method belongs to a
 * system class, no class loader will be involved. Otherwise, the proper class loader will be
 * invoked to load and link the named class. Since Java 2 SDK release 1.2, when FindClass is
 * called through the Invocation Interface, there is no current native method or its associated
 * class loader. In that case, the result of {@link ClassLoader#getSystemClassLoader} is used.
 * This is the class loader the virtual machine creates for applications, and is able to locate
 * classes listed in the java.class.path property. The name argument is a fully-qualified class
 * name or an array type signature .
 * <p>
 * For example, the fully-qualified class name for the {@code java.lang.String} class is:
 *
 * <pre>
 * "java/lang/String"}
 * </pre>
 *
 * <p>
 * The array type signature of the array class {@code java.lang.Object[]} is:
 *
 * <pre>
 * "[Ljava/lang/Object;"
 * </pre>
 *
 * @param namePtr a fully-qualified class name (that is, a package name, delimited by "/",
 *            followed by the class name). If the name begins with "[" (the array signature
 *            character), it returns an array class. The string is encoded in modified UTF-8.
 * @return Returns a class object from a fully-qualified name, or NULL if the class cannot be
 *         found.
 * @throws ClassFormatError if the class data does not specify a valid class.
 * @throws ClassCircularityError if a class or interface would be its own superclass or
 *             superinterface.
 * @throws NoClassDefFoundError if no definition for a requested class or interface can be
 *             found.
 * @throws OutOfMemoryError if the system runs out of memory.
 */
@TruffleBoundary
@JniImpl
@JavaType(Class.class)
public StaticObject FindClass(@Pointer TruffleObject namePtr, @Inject SubstitutionProfiler profiler) {
    String name = NativeUtils.interopPointerToString(namePtr);
    Meta meta = getMeta();
    if (name == null || (name.indexOf('.') > -1)) {
        profiler.profile(7);
        throw meta.throwExceptionWithMessage(meta.java_lang_NoClassDefFoundError, name);
    }
    String internalName = name;
    if (!name.startsWith("[")) {
        // Force 'L' type.
        internalName = "L" + name + ";";
    }
    if (!Validation.validTypeDescriptor(ByteSequence.create(internalName), true)) {
        profiler.profile(6);
        throw meta.throwExceptionWithMessage(meta.java_lang_NoClassDefFoundError, name);
    }
    StaticObject protectionDomain = StaticObject.NULL;
    StaticObject loader = StaticObject.NULL;
    // security stack walk
    StaticObject caller = getVM().JVM_GetCallerClass(0, profiler);
    if (StaticObject.notNull(caller)) {
        Klass callerKlass = caller.getMirrorKlass();
        loader = callerKlass.getDefiningClassLoader();
        if (StaticObject.isNull(loader) && Type.java_lang_ClassLoader$NativeLibrary.equals(callerKlass.getType())) {
            StaticObject result = (StaticObject) getMeta().java_lang_ClassLoader$NativeLibrary_getFromClass.invokeDirect(null);
            loader = result.getMirrorKlass().getDefiningClassLoader();
            protectionDomain = getVM().JVM_GetProtectionDomain(result);
        }
    } else {
        loader = (StaticObject) getMeta().java_lang_ClassLoader_getSystemClassLoader.invokeDirect(null);
    }
    StaticObject guestClass = StaticObject.NULL;
    try {
        String dotName = name.replace('/', '.');
        guestClass = (StaticObject) getMeta().java_lang_Class_forName_String_boolean_ClassLoader.invokeDirect(null, meta.toGuestString(dotName), false, loader);
        EspressoError.guarantee(StaticObject.notNull(guestClass), "Class.forName returned null");
    } catch (EspressoException e) {
        profiler.profile(5);
        if (InterpreterToVM.instanceOf(e.getGuestException(), meta.java_lang_ClassNotFoundException)) {
            profiler.profile(4);
            throw meta.throwExceptionWithMessage(meta.java_lang_NoClassDefFoundError, name);
        }
        throw e;
    }
    meta.HIDDEN_PROTECTION_DOMAIN.setHiddenObject(guestClass, protectionDomain);
    // FindClass should initialize the class.
    guestClass.getMirrorKlass().safeInitialize();
    return guestClass;
}

Example 7 with Klass

use of com.oracle.truffle.espresso.impl.Klass in project graal by oracle.

the class JniEnv method NewObjectVarargs.

@JniImpl
@JavaType(Object.class)
public StaticObject NewObjectVarargs(@JavaType(Class.class) StaticObject clazz, @Handle(Method.class) long methodId, @Pointer TruffleObject varargsPtr) {
    Method method = methodIds.getObject(methodId);
    assert method.isConstructor();
    Klass klass = clazz.getMirrorKlass();
    if (klass.isInterface() || klass.isAbstract()) {
        Meta meta = getMeta();
        throw meta.throwException(meta.java_lang_InstantiationException);
    }
    klass.initialize();
    StaticObject instance;
    if (CompilerDirectives.isPartialEvaluationConstant(klass)) {
        instance = klass.allocateInstance();
    } else {
        instance = allocateBoundary(klass);
    }
    method.invokeDirect(instance, popVarArgs(varargsPtr, method.getParsedSignature()));
    return instance;
}

Example 8 with Klass

use of com.oracle.truffle.espresso.impl.Klass in project graal by oracle.

the class JniEnv method GetFieldID.

// Checkstyle: stop method name check
// region Get*ID
/**
 * <h3>jfieldID GetFieldID(JNIEnv *env, jclass clazz, const char *name, const char *sig);</h3>
 * <p>
 * Returns the field ID for an instance (nonstatic) field of a class. The field is specified by
 * its name and signature. The Get<type>Field and Set<type>Field families of accessor functions
 * use field IDs to retrieve object fields. GetFieldID() causes an uninitialized class to be
 * initialized. GetFieldID() cannot be used to obtain the length field of an array. Use
 * GetArrayLength() instead.
 *
 * @param clazz a Java class object.
 * @param namePtr the field name in a 0-terminated modified UTF-8 string.
 * @param typePtr the field signature in a 0-terminated modified UTF-8 string.
 * @return a field ID, or NULL if the operation fails.
 * @throws NoSuchFieldError: if the specified field cannot be found.
 * @throws ExceptionInInitializerError: if the class initializer fails due to an exception.
 * @throws OutOfMemoryError: if the system runs out of memory.
 */
@JniImpl
@Handle(Field.class)
public long GetFieldID(@JavaType(Class.class) StaticObject clazz, @Pointer TruffleObject namePtr, @Pointer TruffleObject typePtr) {
    String name = NativeUtils.interopPointerToString(namePtr);
    String type = NativeUtils.interopPointerToString(typePtr);
    assert name != null && type != null;
    Klass klass = clazz.getMirrorKlass();
    Field field = null;
    Symbol<Name> fieldName = getNames().lookup(name);
    if (fieldName != null) {
        Symbol<Type> fieldType = getTypes().lookup(type);
        if (fieldType != null) {
            // Lookup only if name and type are known symbols.
            klass.safeInitialize();
            field = klass.lookupField(fieldName, fieldType);
            assert field == null || field.getType().equals(fieldType);
        }
    }
    if (field == null || field.isStatic()) {
        Meta meta = getMeta();
        throw meta.throwExceptionWithMessage(meta.java_lang_NoSuchFieldError, name);
    }
    assert !field.isStatic();
    return fieldIds.handlify(field);
}

Example 9 with Klass

use of com.oracle.truffle.espresso.impl.Klass in project graal by oracle.

the class VM method createDummyACC.

@JavaType(AccessControlContext.class)
private StaticObject createDummyACC() {
    Klass pdKlass = getMeta().java_security_ProtectionDomain;
    StaticObject pd = pdKlass.allocateInstance();
    getMeta().java_security_ProtectionDomain_init_CodeSource_PermissionCollection.invokeDirect(pd, StaticObject.NULL, StaticObject.NULL);
    StaticObject context = StaticObject.wrap(new StaticObject[] { pd }, getMeta());
    return createACC(context, false, StaticObject.NULL);
}

Example 10 with Klass

use of com.oracle.truffle.espresso.impl.Klass in project graal by oracle.

the class VM method JVM_GetClassName.

@VmImpl(isJni = true)
@JavaType(String.class)
public StaticObject JVM_GetClassName(@JavaType(Class.class) StaticObject self) {
    Klass klass = self.getMirrorKlass();
    // Conversion from internal form.
    String externalName = klass.getExternalName();
    // Class names must be interned.
    StaticObject guestString = getMeta().toGuestString(externalName);
    return getStrings().intern(guestString);
}