/*
 * Resolve a native method and invoke it.
 *
 * This is executed as if it were a native bridge or function.  If the
 * resolution succeeds, method->insns is replaced, and we don't go through
 * here again.
 *
 * Initializes method's class if necessary.
 *
 * An exception is thrown on resolution failure.
 */
void dvmResolveNativeMethod(const u4* args, JValue* pResult,
    const Method* method, Thread* self)
{
    ClassObject* clazz = method->clazz;
    void* func;

    /*
     * If this is a static method, it could be called before the class
     * has been initialized.
     */
    if (dvmIsStaticMethod(method)) {
        if (!dvmIsClassInitialized(clazz) && !dvmInitClass(clazz)) {
            assert(dvmCheckException(dvmThreadSelf()));
            return;
        }
    } else {
        assert(dvmIsClassInitialized(clazz) ||
               dvmIsClassInitializing(clazz));
    }

    /* start with our internal-native methods */
    func = dvmLookupInternalNativeMethod(method);
    if (func != NULL) {
        /* resolution always gets the same answer, so no race here */
        IF_LOGVV() {
            char* desc = dexProtoCopyMethodDescriptor(&method->prototype);
            LOGVV("+++ resolved native %s.%s %s, invoking\n",
                clazz->descriptor, method->name, desc);
            free(desc);
        }
Exemplo n.º 2
0
/*
 * Get an array with all constructors declared by a class.
 */
ArrayObject* dvmGetDeclaredConstructors(ClassObject* clazz, bool publicOnly)
{
    if (!dvmIsClassInitialized(gDvm.classJavaLangReflectConstructor))
        dvmInitClass(gDvm.classJavaLangReflectConstructor);

    /*
     * Ordinarily we init the class the first time we resolve a method.
     * We're bypassing the normal resolution mechanism, so we init it here.
     */
    if (!dvmIsClassInitialized(clazz))
        dvmInitClass(clazz);

    /*
     * Count up the #of relevant methods.
     */
    size_t count = 0;
    for (int i = 0; i < clazz->directMethodCount; ++i) {
        Method* meth = &clazz->directMethods[i];
        if ((!publicOnly || dvmIsPublicMethod(meth)) &&
            dvmIsConstructorMethod(meth) && !dvmIsStaticMethod(meth))
        {
            count++;
        }
    }

    /*
     * Create an array of Constructor objects.
     */
    ClassObject* arrayClass = gDvm.classJavaLangReflectConstructorArray;
    ArrayObject* ctorArray = dvmAllocArrayByClass(arrayClass, count, ALLOC_DEFAULT);
    if (ctorArray == NULL)
        return NULL;

    /*
     * Fill out the array.
     */
    size_t ctorObjCount = 0;
    for (int i = 0; i < clazz->directMethodCount; ++i) {
        Method* meth = &clazz->directMethods[i];
        if ((!publicOnly || dvmIsPublicMethod(meth)) &&
            dvmIsConstructorMethod(meth) && !dvmIsStaticMethod(meth))
        {
            Object* ctorObj = createConstructorObject(meth);
            if (ctorObj == NULL) {
              dvmReleaseTrackedAlloc((Object*) ctorArray, NULL);
              return NULL;
            }
            dvmSetObjectArrayElement(ctorArray, ctorObjCount, ctorObj);
            ++ctorObjCount;
            dvmReleaseTrackedAlloc(ctorObj, NULL);
        }
    }

    assert(ctorObjCount == ctorArray->length);

    /* caller must call dvmReleaseTrackedAlloc */
    return ctorArray;
}
Exemplo n.º 3
0
/*
 * Resolve a static field reference.  The DexFile format doesn't distinguish
 * between static and instance field references, so the "resolved" pointer
 * in the Dex struct will have the wrong type.  We trivially cast it here.
 *
 * Causes the field's class to be initialized.
 */
StaticField* dvmResolveStaticField(const ClassObject* referrer, u4 sfieldIdx)
{
    DvmDex* pDvmDex = referrer->pDvmDex;
    ClassObject* resClass;
    const DexFieldId* pFieldId;
    StaticField* resField;

    pFieldId = dexGetFieldId(pDvmDex->pDexFile, sfieldIdx);

    /*
     * Find the field's class.
     */
    resClass = dvmResolveClass(referrer, pFieldId->classIdx, false);
    if (resClass == NULL) {
        assert(dvmCheckException(dvmThreadSelf()));
        return NULL;
    }

    resField = dvmFindStaticFieldHier(resClass,
                dexStringById(pDvmDex->pDexFile, pFieldId->nameIdx),
                dexStringByTypeIdx(pDvmDex->pDexFile, pFieldId->typeIdx));
    if (resField == NULL) {
        dvmThrowNoSuchFieldError(
            dexStringById(pDvmDex->pDexFile, pFieldId->nameIdx));
        return NULL;
    }

    /*
     * If we're the first to resolve the field in which this class resides,
     * we need to do it now.  Note that, if the field was inherited from
     * a superclass, it is not necessarily the same as "resClass".
     */
    if (!dvmIsClassInitialized(resField->clazz) &&
        !dvmInitClass(resField->clazz))
    {
        assert(dvmCheckException(dvmThreadSelf()));
        return NULL;
    }

    /*
     * If the class has been initialized, add a pointer to our data structure
     * so we don't have to jump through the hoops again.  If it's still
     * initializing (i.e. this thread is executing <clinit>), don't do
     * the store, otherwise other threads could use the field without waiting
     * for class init to finish.
     */
    if (dvmIsClassInitialized(resField->clazz)) {
        dvmDexSetResolvedField(pDvmDex, sfieldIdx, (Field*) resField);
    } else {
        LOGVV("--- not caching resolved field %s.%s (class init=%d/%d)",
            resField->clazz->descriptor, resField->name,
            dvmIsClassInitializing(resField->clazz),
            dvmIsClassInitialized(resField->clazz));
    }

    return resField;
}
Exemplo n.º 4
0
/*
 * Get the named field.
 */
Object* dvmGetDeclaredField(ClassObject* clazz, StringObject* nameObj)
{
    int i;
    Object* fieldObj = NULL;
    char* name = dvmCreateCstrFromString(nameObj);

    if (!dvmIsClassInitialized(gDvm.classJavaLangReflectField))
        dvmInitClass(gDvm.classJavaLangReflectField);

    for (i = 0; i < clazz->sfieldCount; i++) {
        Field* field = &clazz->sfields[i];
        if (strcmp(name, field->name) == 0) {
            fieldObj = createFieldObject(field, clazz);
            break;
        }
    }
    if (fieldObj == NULL) {
        for (i = 0; i < clazz->ifieldCount; i++) {
            Field* field = &clazz->ifields[i];
            if (strcmp(name, field->name) == 0) {
                fieldObj = createFieldObject(field, clazz);
                break;
            }
        }
    }

    free(name);
    return fieldObj;
}
Exemplo n.º 5
0
/*
 * Create an instance of the specified class.
 *
 * Returns NULL and throws an exception on failure.
 */
Object* dvmAllocObject(ClassObject* clazz, int flags)
{
    Object* newObj;

    assert(clazz != NULL);
    assert(dvmIsClassInitialized(clazz) || dvmIsClassInitializing(clazz));

    /* allocate on GC heap; memory is zeroed out */
    newObj = (Object*)dvmMalloc(clazz->objectSize, flags);
    if (newObj != NULL) {
        DVM_OBJECT_INIT(newObj, clazz);
        dvmTrackAllocation(clazz, clazz->objectSize);   /* notify DDMS */
    }

    //SVM CODE SUPPORT
    //init the tag of an object to 0
    newObj->tag = 0;
    pthread_mutex_lock(&gDvm.s_mtx);
    if(gDvm.newObjHook){
        gDvm.newObjHook(newObj);
    }
    pthread_mutex_unlock(&gDvm.s_mtx);
    //SVM CODE SUPPORT END

    return newObj;
}
Exemplo n.º 6
0
/*
 * Create an instance of the specified class.
 *
 * Returns NULL and throws an exception on failure.
 */
Object* dvmAllocObject(ClassObject* clazz, int flags)
{
    Object* newObj;

    assert(dvmIsClassInitialized(clazz) || dvmIsClassInitializing(clazz));

    if (IS_CLASS_FLAG_SET(clazz, CLASS_ISFINALIZABLE)) {
        flags |= ALLOC_FINALIZABLE;
    }

    /* allocate on GC heap; memory is zeroed out */
    newObj = dvmMalloc(clazz->objectSize, flags);
    if (newObj != NULL) {
        DVM_OBJECT_INIT(newObj, clazz);

		Monitor* mon = NULL;//dvmCreateMonitor(newObj);
		newObj->lock = (u4)mon | LW_SHAPE_FAT;

        LOGVV("AllocObject: %s (%d)\n", clazz->descriptor,
            (int) clazz->objectSize);
#if WITH_HPROF && WITH_HPROF_STACK
        hprofFillInStackTrace(newObj);
#endif
        dvmTrackAllocation(clazz, clazz->objectSize);
    }

    return newObj;
}
Exemplo n.º 7
0
// Based on dvmResolveInstField/dvmResolveStaticField.
static void preloadDexCachesResolveField(DvmDex* pDvmDex, uint32_t fieldIdx, bool instance) {
    Field* field = dvmDexGetResolvedField(pDvmDex, fieldIdx);
    if (field != NULL) {
        return;
    }
    const DexFile* pDexFile = pDvmDex->pDexFile;
    const DexFieldId* pFieldId = dexGetFieldId(pDexFile, fieldIdx);
    ClassObject* clazz = dvmDexGetResolvedClass(pDvmDex, pFieldId->classIdx);
    if (clazz == NULL) {
        return;
    }
    // Skip static fields for uninitialized classes because a filled
    // cache entry implies the class is initialized.
    if (!instance && !dvmIsClassInitialized(clazz)) {
        return;
    }
    const char* fieldName = dexStringById(pDexFile, pFieldId->nameIdx);
    const char* signature = dexStringByTypeIdx(pDexFile, pFieldId->typeIdx);
    if (instance) {
        field = dvmFindInstanceFieldHier(clazz, fieldName, signature);
    } else {
        field = dvmFindStaticFieldHier(clazz, fieldName, signature);
    }
    if (field == NULL) {
        return;
    }
    // ALOGI("VMRuntime.preloadDexCaches found field %s %s.%s",
    //       signature, clazz->descriptor, fieldName);
    dvmDexSetResolvedField(pDvmDex, fieldIdx, field);
}
Exemplo n.º 8
0
/*
 * JNI reflection support: convert Method to reflection object.
 *
 * The returned object will be either a java.lang.reflect.Method or
 * .Constructor, depending on whether "method" is a constructor.
 *
 * This is also used for certain "system" annotations.
 *
 * Caller must call dvmReleaseTrackedAlloc().
 */
Object* dvmCreateReflectObjForMethod(const ClassObject* clazz, Method* method)
{
    UNUSED_PARAMETER(clazz);

    if (strcmp(method->name, "<init>") == 0) {
        if (!dvmIsClassInitialized(gDvm.classJavaLangReflectConstructor))
            dvmInitClass(gDvm.classJavaLangReflectConstructor);

        return createConstructorObject(method);
    } else {
        if (!dvmIsClassInitialized(gDvm.classJavaLangReflectMethod))
            dvmInitClass(gDvm.classJavaLangReflectMethod);

        return dvmCreateReflectMethodObject(method);
    }
}
Exemplo n.º 9
0
/*
 * JNI reflection support: convert Field to reflection object.
 *
 * The return value is a java.lang.reflect.Field.
 *
 * Caller must call dvmReleaseTrackedAlloc().
 */
Object* dvmCreateReflectObjForField(const ClassObject* clazz, Field* field)
{
    if (!dvmIsClassInitialized(gDvm.classJavaLangReflectField))
        dvmInitClass(gDvm.classJavaLangReflectField);

    /* caller must dvmReleaseTrackedAlloc(result) */
    return createFieldObject(field, clazz);
}
Exemplo n.º 10
0
/*
 * Resolve an instance field reference.
 *
 * Returns NULL and throws an exception on error (no such field, illegal
 * access).
 */
InstField* dvmResolveInstField(const ClassObject* referrer, u4 ifieldIdx)
{
    DvmDex* pDvmDex = referrer->pDvmDex;
    ClassObject* resClass;
    const DexFieldId* pFieldId;
    InstField* resField;

    LOGVV("--- resolving field %u (referrer=%s cl=%p)",
        ifieldIdx, referrer->descriptor, referrer->classLoader);

    pFieldId = dexGetFieldId(pDvmDex->pDexFile, ifieldIdx);

    /*
     * Find the field's class.
     */
    resClass = dvmResolveClass(referrer, pFieldId->classIdx, false);
    if (resClass == NULL) {
        assert(dvmCheckException(dvmThreadSelf()));
        return NULL;
    }

    resField = dvmFindInstanceFieldHier(resClass,
        dexStringById(pDvmDex->pDexFile, pFieldId->nameIdx),
        dexStringByTypeIdx(pDvmDex->pDexFile, pFieldId->typeIdx));
    if (resField == NULL) {
        dvmThrowNoSuchFieldError(
            dexStringById(pDvmDex->pDexFile, pFieldId->nameIdx));
        return NULL;
    }

    /*
     * Class must be initialized by now (unless verifier is buggy).  We
     * could still be in the process of initializing it if the field
     * access is from a static initializer.
     */
    assert(dvmIsClassInitialized(resField->clazz) ||
           dvmIsClassInitializing(resField->clazz));

    /*
     * The class is initialized (or initializing), the field has been
     * found.  Add a pointer to our data structure so we don't have to
     * jump through the hoops again.
     *
     * Anything that uses the resolved table entry must have an instance
     * of the class, so any class init activity has already happened (or
     * been deliberately bypassed when <clinit> created an instance).
     * So it's always okay to update the table.
     */
    dvmDexSetResolvedField(pDvmDex, ifieldIdx, (Field*)resField);
    LOGVV("    field %u is %s.%s",
        ifieldIdx, resField->clazz->descriptor, resField->name);

    return resField;
}
Exemplo n.º 11
0
/*
 * Resolve an instance field reference.
 *
 * Returns NULL and throws an exception on error (no such field, illegal
 * access).
 */
InstField* dvmResolveInstField(const ClassObject* referrer, u4 ifieldIdx)
{
    DvmDex* pDvmDex = referrer->pDvmDex;
    ClassObject* resClass;
    const DexFieldId* pFieldId;
    InstField* resField;

    LOGVV("--- resolving field %u (referrer=%s cl=%p)\n",
          ifieldIdx, referrer->descriptor, referrer->classLoader);

    pFieldId = dexGetFieldId(pDvmDex->pDexFile, ifieldIdx);

    /*
     * Find the field's class.
     */
    resClass = dvmResolveClass(referrer, pFieldId->classIdx, false);
    if (resClass == NULL) {
        assert(dvmCheckException(dvmThreadSelf()));
        return NULL;
    }

    resField = dvmFindInstanceFieldHier(resClass,
                                        dexStringById(pDvmDex->pDexFile, pFieldId->nameIdx),
                                        dexStringByTypeIdx(pDvmDex->pDexFile, pFieldId->typeIdx));
    if (resField == NULL) {
        dvmThrowException("Ljava/lang/NoSuchFieldError;",
                          dexStringById(pDvmDex->pDexFile, pFieldId->nameIdx));
        return NULL;
    }

    /*
     * Class must be initialized by now (unless verifier is buggy).  We
     * could still be in the process of initializing it if the field
     * access is from a static initializer.
     */
    assert(dvmIsClassInitialized(resField->field.clazz) ||
           dvmIsClassInitializing(resField->field.clazz));

    /*
     * The class is initialized, the method has been found.  Add a pointer
     * to our data structure so we don't have to jump through the hoops again.
     */
    dvmDexSetResolvedField(pDvmDex, ifieldIdx, (Field*)resField);
    LOGVV("    field %u is %s.%s\n",
          ifieldIdx, resField->field.clazz->descriptor, resField->field.name);

    return resField;
}
Exemplo n.º 12
0
/*
 * Create an instance of the specified class.
 *
 * Returns NULL and throws an exception on failure.
 */
Object* dvmAllocObject(ClassObject* clazz, int flags)
{
    Object* newObj;

    assert(clazz != NULL);
    assert(dvmIsClassInitialized(clazz) || dvmIsClassInitializing(clazz));

    /* allocate on GC heap; memory is zeroed out */
    newObj = (Object*)dvmMalloc(clazz->objectSize, flags);
    if (newObj != NULL) {
        DVM_OBJECT_INIT(newObj, clazz);
        dvmTrackAllocation(clazz, clazz->objectSize);   /* notify DDMS */
    }

    return newObj;
}
Exemplo n.º 13
0
/*
 * Resolve a static field reference.  The DexFile format doesn't distinguish
 * between static and instance field references, so the "resolved" pointer
 * in the Dex struct will have the wrong type.  We trivially cast it here.
 *
 * Causes the field's class to be initialized.
 */
StaticField* dvmResolveStaticField(const ClassObject* referrer, u4 sfieldIdx)
{
    DvmDex* pDvmDex = referrer->pDvmDex;
    ClassObject* resClass;
    const DexFieldId* pFieldId;
    StaticField* resField;

    pFieldId = dexGetFieldId(pDvmDex->pDexFile, sfieldIdx);

    /*
     * Find the field's class.
     */
    resClass = dvmResolveClass(referrer, pFieldId->classIdx, false);
    if (resClass == NULL) {
        assert(dvmCheckException(dvmThreadSelf()));
        return NULL;
    }

    resField = dvmFindStaticFieldHier(resClass,
                                      dexStringById(pDvmDex->pDexFile, pFieldId->nameIdx),
                                      dexStringByTypeIdx(pDvmDex->pDexFile, pFieldId->typeIdx));
    if (resField == NULL) {
        dvmThrowException("Ljava/lang/NoSuchFieldError;",
                          dexStringById(pDvmDex->pDexFile, pFieldId->nameIdx));
        return NULL;
    }

    /*
     * If we're the first to resolve the field in which this class resides,
     * we need to do it now.  Note that, if the field was inherited from
     * a superclass, it is not necessarily the same as "resClass".
     */
    if (!dvmIsClassInitialized(resField->field.clazz) &&
            !dvmInitClass(resField->field.clazz))
    {
        assert(dvmCheckException(dvmThreadSelf()));
        return NULL;
    }

    /*
     * The class is initialized, the method has been found.  Add a pointer
     * to our data structure so we don't have to jump through the hoops again.
     */
    dvmDexSetResolvedField(pDvmDex, sfieldIdx, (Field*) resField);

    return resField;
}
Exemplo n.º 14
0
/*
 * Create a new java.lang.reflect.Field object from "field".
 *
 * The Field spec doesn't specify the constructor.  We're going to use the
 * one from our existing class libs:
 *
 *  private Field(Class declaringClass, Class type, String name, int slot)
 */
static Object* createFieldObject(Field* field, const ClassObject* clazz)
{
    Object* result = NULL;
    Object* fieldObj = NULL;
    StringObject* nameObj = NULL;
    ClassObject* type;
    char* mangle;
    char* cp;
    int slot, field_idx;

    assert(dvmIsClassInitialized(gDvm.classJavaLangReflectField));

    fieldObj = dvmAllocObject(gDvm.classJavaLangReflectField, ALLOC_DEFAULT);
    if (fieldObj == NULL)
        goto bail;

    cp = mangle = strdup(field->signature);
    type = convertSignaturePartToClass(&cp, clazz);
    free(mangle);
    if (type == NULL)
        goto bail;

    nameObj = dvmCreateStringFromCstr(field->name);
    if (nameObj == NULL)
        goto bail;

    slot = fieldToSlot(field, clazz);
    field_idx = dvmGetFieldIdx(field);

    JValue unused;
    dvmCallMethod(dvmThreadSelf(), gDvm.methJavaLangReflectField_init,
        fieldObj, &unused, clazz, type, nameObj, slot, field_idx);
    if (dvmCheckException(dvmThreadSelf())) {
        ALOGD("Field class init threw exception");
        goto bail;
    }

    result = fieldObj;

bail:
    dvmReleaseTrackedAlloc((Object*) nameObj, NULL);
    if (result == NULL)
        dvmReleaseTrackedAlloc((Object*) fieldObj, NULL);
    /* caller must dvmReleaseTrackedAlloc(result) */
    return result;
}
Exemplo n.º 15
0
/*
 * Create an instance of the specified class.
 *
 * Returns NULL and throws an exception on failure.
 */
Object* dvmAllocObject(ClassObject* clazz, int flags)
{
    Object* newObj;

    assert(dvmIsClassInitialized(clazz) || dvmIsClassInitializing(clazz));

    if (IS_CLASS_FLAG_SET(clazz, CLASS_ISFINALIZABLE)) {
        flags |= ALLOC_FINALIZABLE;
    }

    /* allocate on GC heap; memory is zeroed out */
    newObj = dvmMalloc(clazz->objectSize, flags);
    if (newObj != NULL) {
        DVM_OBJECT_INIT(newObj, clazz);
#if WITH_HPROF && WITH_HPROF_STACK
        hprofFillInStackTrace(newObj);
#endif
        dvmTrackAllocation(clazz, clazz->objectSize);
    }

    return newObj;
}
Exemplo n.º 16
0
/*
 * public int constructNative(Object[] args, Class declaringClass,
 *     Class[] parameterTypes, int slot, boolean noAccessCheck)
 *
 * We get here through Constructor.newInstance().  The Constructor object
 * would not be available if the constructor weren't public (per the
 * definition of Class.getConstructor), so we can skip the method access
 * check.  We can also safely assume the constructor isn't associated
 * with an interface, array, or primitive class.
 */
static void Dalvik_java_lang_reflect_Constructor_constructNative(
    const u4* args, JValue* pResult)
{
    // ignore thisPtr in args[0]
    ArrayObject* argList = (ArrayObject*) args[1];
    ClassObject* declaringClass = (ClassObject*) args[2];
    ArrayObject* params = (ArrayObject*) args[3];
    int slot = args[4];
    bool noAccessCheck = (args[5] != 0);
    Object* newObj;
    Method* meth;

    if (dvmIsAbstractClass(declaringClass)) {
        dvmThrowInstantiationException(declaringClass, NULL);
        RETURN_VOID();
    }

    /* initialize the class if it hasn't been already */
    if (!dvmIsClassInitialized(declaringClass)) {
        if (!dvmInitClass(declaringClass)) {
            ALOGW("Class init failed in Constructor.constructNative (%s)",
                declaringClass->descriptor);
            assert(dvmCheckException(dvmThreadSelf()));
            RETURN_VOID();
        }
    }

    newObj = dvmAllocObject(declaringClass, ALLOC_DEFAULT);
    if (newObj == NULL)
        RETURN_PTR(NULL);

    meth = dvmSlotToMethod(declaringClass, slot);
    assert(meth != NULL);

    (void) dvmInvokeMethod(newObj, meth, argList, params, NULL, noAccessCheck);
    dvmReleaseTrackedAlloc(newObj, NULL);
    RETURN_PTR(newObj);
}
Exemplo n.º 17
0
/*
 * Allocate a new instance of the class String, performing first-use
 * initialization of the class if necessary. Upon success, the
 * returned value will have all its fields except hashCode already
 * filled in, including a reference to a newly-allocated char[] for
 * the contents, sized as given. Additionally, a reference to the
 * chars array is stored to the pChars pointer. Callers must
 * subsequently call dvmReleaseTrackedAlloc() on the result pointer.
 * This function returns NULL on failure.
 */
static StringObject* makeStringObject(u4 charsLength, ArrayObject** pChars)
{
    /*
     * The String class should have already gotten found (but not
     * necessarily initialized) before making it here. We assert it
     * explicitly, since historically speaking, we have had bugs with
     * regard to when the class String gets set up. The assert helps
     * make any regressions easier to diagnose.
     */
    assert(gDvm.classJavaLangString != NULL);

    if (!dvmIsClassInitialized(gDvm.classJavaLangString)) {
        /* Perform first-time use initialization of the class. */
        if (!dvmInitClass(gDvm.classJavaLangString)) {
            LOGE("FATAL: Could not initialize class String");
            dvmAbort();
        }
    }

    Object* result = dvmAllocObject(gDvm.classJavaLangString, ALLOC_DEFAULT);
    if (result == NULL) {
        return NULL;
    }

    ArrayObject* chars = dvmAllocPrimitiveArray('C', charsLength, ALLOC_DEFAULT);
    if (chars == NULL) {
        dvmReleaseTrackedAlloc(result, NULL);
        return NULL;
    }

    dvmSetFieldInt(result, STRING_FIELDOFF_COUNT, charsLength);
    dvmSetFieldObject(result, STRING_FIELDOFF_VALUE, (Object*) chars);
    dvmReleaseTrackedAlloc((Object*) chars, NULL);
    /* Leave offset and hashCode set to zero. */

    *pChars = chars;
    return (StringObject*) result;
}
Exemplo n.º 18
0
/*
 * Get all interfaces a class implements. If this is unable to allocate
 * the result array, this raises an OutOfMemoryError and returns NULL.
 */
ArrayObject* dvmGetInterfaces(ClassObject* clazz)
{
    if (!dvmIsClassInitialized(gDvm.classJavaLangReflectMethod))
        dvmInitClass(gDvm.classJavaLangReflectMethod);

    /*
     * Create an array of Class objects.
     */
    size_t count = clazz->interfaceCount;
    ArrayObject* interfaceArray =
        dvmAllocArrayByClass(gDvm.classJavaLangClassArray, count, ALLOC_DEFAULT);
    if (interfaceArray == NULL)
        return NULL;

    /*
     * Fill out the array.
     */
    memcpy(interfaceArray->contents, clazz->interfaces,
           count * sizeof(Object *));
    dvmWriteBarrierArray(interfaceArray, 0, count);

    /* caller must call dvmReleaseTrackedAlloc */
    return interfaceArray;
}
Exemplo n.º 19
0
// Based on dvmResolveMethod.
static void preloadDexCachesResolveMethod(DvmDex* pDvmDex,
                                          uint32_t methodIdx,
                                          MethodType methodType) {
    Method* method = dvmDexGetResolvedMethod(pDvmDex, methodIdx);
    if (method != NULL) {
        return;
    }
    const DexFile* pDexFile = pDvmDex->pDexFile;
    const DexMethodId* pMethodId = dexGetMethodId(pDexFile, methodIdx);
    ClassObject* clazz = dvmDexGetResolvedClass(pDvmDex, pMethodId->classIdx);
    if (clazz == NULL) {
        return;
    }
    // Skip static methods for uninitialized classes because a filled
    // cache entry implies the class is initialized.
    if ((methodType == METHOD_STATIC) && !dvmIsClassInitialized(clazz)) {
        return;
    }
    const char* methodName = dexStringById(pDexFile, pMethodId->nameIdx);
    DexProto proto;
    dexProtoSetFromMethodId(&proto, pDexFile, pMethodId);

    if (methodType == METHOD_DIRECT) {
        method = dvmFindDirectMethod(clazz, methodName, &proto);
    } else if (methodType == METHOD_STATIC) {
        method = dvmFindDirectMethodHier(clazz, methodName, &proto);
    } else {
        method = dvmFindVirtualMethodHier(clazz, methodName, &proto);
    }
    if (method == NULL) {
        return;
    }
    // ALOGI("VMRuntime.preloadDexCaches found method %s.%s",
    //        clazz->descriptor, methodName);
    dvmDexSetResolvedMethod(pDvmDex, methodIdx, method);
}
Exemplo n.º 20
0
// Based on dvmResolveClass.
static void preloadDexCachesResolveType(DvmDex* pDvmDex, uint32_t typeIdx) {
    ClassObject* clazz = dvmDexGetResolvedClass(pDvmDex, typeIdx);
    if (clazz != NULL) {
        return;
    }
    const DexFile* pDexFile = pDvmDex->pDexFile;
    const char* className = dexStringByTypeIdx(pDexFile, typeIdx);
    if (className[0] != '\0' && className[1] == '\0') {
        /* primitive type */
        clazz = dvmFindPrimitiveClass(className[0]);
    } else {
        clazz = dvmLookupClass(className, NULL, true);
    }
    if (clazz == NULL) {
        return;
    }
    // Skip uninitialized classes because filled cache entry implies it is initialized.
    if (!dvmIsClassInitialized(clazz)) {
        // ALOGI("VMRuntime.preloadDexCaches uninitialized clazz=%s", className);
        return;
    }
    // ALOGI("VMRuntime.preloadDexCaches found clazz=%s", className);
    dvmDexSetResolvedClass(pDvmDex, typeIdx, clazz);
}
Exemplo n.º 21
0
/*
 * Start/continue throwing process now that we have a class reference.
 */
void dvmThrowChainedExceptionByClass(ClassObject* excepClass, const char* msg,
    Object* cause)
{
    Thread* self = dvmThreadSelf();
    Object* exception;

    /* make sure the exception is initialized */
    if (!dvmIsClassInitialized(excepClass) && !dvmInitClass(excepClass)) {
        LOGE("ERROR: unable to initialize exception class '%s'\n",
            excepClass->descriptor);
        if (strcmp(excepClass->descriptor, "Ljava/lang/InternalError;") == 0)
            dvmAbort();
        dvmThrowChainedException("Ljava/lang/InternalError;",
            "failed to init original exception class", cause);
        return;
    }

    exception = dvmAllocObject(excepClass, ALLOC_DEFAULT);
    if (exception == NULL) {
        /*
         * We're in a lot of trouble.  We might be in the process of
         * throwing an out-of-memory exception, in which case the
         * pre-allocated object will have been thrown when our object alloc
         * failed.  So long as there's an exception raised, return and
         * allow the system to try to recover.  If not, something is broken
         * and we need to bail out.
         */
        if (dvmCheckException(self))
            goto bail;
        LOGE("FATAL: unable to allocate exception '%s' '%s'\n",
            excepClass->descriptor, msg != NULL ? msg : "(no msg)");
        dvmAbort();
    }

    /*
     * Init the exception.
     */
    if (gDvm.optimizing) {
        /* need the exception object, but can't invoke interpreted code */
        LOGV("Skipping init of exception %s '%s'\n",
            excepClass->descriptor, msg);
    } else {
        assert(excepClass == exception->clazz);
        if (!initException(exception, msg, cause, self)) {
            /*
             * Whoops.  If we can't initialize the exception, we can't use
             * it.  If there's an exception already set, the constructor
             * probably threw an OutOfMemoryError.
             */
            if (!dvmCheckException(self)) {
                /*
                 * We're required to throw something, so we just
                 * throw the pre-constructed internal error.
                 */
                self->exception = gDvm.internalErrorObj;
            }
            goto bail;
        }
    }

    self->exception = exception;

bail:
    dvmReleaseTrackedAlloc(exception, self);
}
Exemplo n.º 22
0
GOTO_TARGET(filledNewArray, bool methodCallRange)
    {
        ClassObject* arrayClass;
        ArrayObject* newArray;
        u4* contents;
        char typeCh;
        int i;
        u4 arg5;

        EXPORT_PC();

        ref = FETCH(1);             /* class ref */
        vdst = FETCH(2);            /* first 4 regs -or- range base */

        if (methodCallRange) {
            vsrc1 = INST_AA(inst);  /* #of elements */
            arg5 = -1;              /* silence compiler warning */
            ILOGV("|filled-new-array-range args=%d @0x%04x {regs=v%d-v%d}",
                vsrc1, ref, vdst, vdst+vsrc1-1);
        } else {
            arg5 = INST_A(inst);
            vsrc1 = INST_B(inst);   /* #of elements */
            ILOGV("|filled-new-array args=%d @0x%04x {regs=0x%04x %x}",
                vsrc1, ref, vdst, arg5);
        }

        /*
         * Resolve the array class.
         */
        arrayClass = dvmDexGetResolvedClass(methodClassDex, ref);
        if (arrayClass == NULL) {
            arrayClass = dvmResolveClass(curMethod->clazz, ref, false);
            if (arrayClass == NULL)
                GOTO_exceptionThrown();
        }
        /*
        if (!dvmIsArrayClass(arrayClass)) {
            dvmThrowException("Ljava/lang/RuntimeError;",
                "filled-new-array needs array class");
            GOTO_exceptionThrown();
        }
        */
        /* verifier guarantees this is an array class */
        assert(dvmIsArrayClass(arrayClass));
        assert(dvmIsClassInitialized(arrayClass));

        /*
         * Create an array of the specified type.
         */
        LOGVV("+++ filled-new-array type is '%s'\n", arrayClass->descriptor);
        typeCh = arrayClass->descriptor[1];
        if (typeCh == 'D' || typeCh == 'J') {
            /* category 2 primitives not allowed */
            dvmThrowException("Ljava/lang/RuntimeError;",
                "bad filled array req");
            GOTO_exceptionThrown();
        } else if (typeCh != 'L' && typeCh != '[' && typeCh != 'I') {
            /* TODO: requires multiple "fill in" loops with different widths */
            LOGE("non-int primitives not implemented\n");
            dvmThrowException("Ljava/lang/InternalError;",
                "filled-new-array not implemented for anything but 'int'");
            GOTO_exceptionThrown();
        }

        newArray = dvmAllocArrayByClass(arrayClass, vsrc1, ALLOC_DONT_TRACK);
        if (newArray == NULL)
            GOTO_exceptionThrown();

        /*
         * Fill in the elements.  It's legal for vsrc1 to be zero.
         */
        contents = (u4*) newArray->contents;
        if (methodCallRange) {
            for (i = 0; i < vsrc1; i++)
                contents[i] = GET_REGISTER(vdst+i);
        } else {
            assert(vsrc1 <= 5);
            if (vsrc1 == 5) {
                contents[4] = GET_REGISTER(arg5);
                vsrc1--;
            }
            for (i = 0; i < vsrc1; i++) {
                contents[i] = GET_REGISTER(vdst & 0x0f);
                vdst >>= 4;
            }
        }

        retval.l = newArray;
    }
Exemplo n.º 23
0
/*
 * Find the method corresponding to "methodRef".
 *
 * We use "referrer" to find the DexFile with the constant pool that
 * "methodRef" is an index into.  We also use its class loader.  The method
 * being resolved may very well be in a different DEX file.
 *
 * If this is a static method, we ensure that the method's class is
 * initialized.
 */
Method* dvmResolveMethod(const ClassObject* referrer, u4 methodIdx,
                         MethodType methodType)
{
    DvmDex* pDvmDex = referrer->pDvmDex;
    ClassObject* resClass;
    const DexMethodId* pMethodId;
    Method* resMethod;

    assert(methodType != METHOD_INTERFACE);

    LOGVV("--- resolving method %u (referrer=%s)\n", methodIdx,
          referrer->descriptor);
    pMethodId = dexGetMethodId(pDvmDex->pDexFile, methodIdx);

    resClass = dvmResolveClass(referrer, pMethodId->classIdx, false);
    if (resClass == NULL) {
        /* can't find the class that the method is a part of */
        assert(dvmCheckException(dvmThreadSelf()));
        return NULL;
    }
    if (dvmIsInterfaceClass(resClass)) {
        /* method is part of an interface */
        dvmThrowExceptionWithClassMessage(
            "Ljava/lang/IncompatibleClassChangeError;",
            resClass->descriptor);
        return NULL;
    }

    const char* name = dexStringById(pDvmDex->pDexFile, pMethodId->nameIdx);
    DexProto proto;
    dexProtoSetFromMethodId(&proto, pDvmDex->pDexFile, pMethodId);

    /*
     * We need to chase up the class hierarchy to find methods defined
     * in super-classes.  (We only want to check the current class
     * if we're looking for a constructor; since DIRECT calls are only
     * for constructors and private methods, we don't want to walk up.)
     */
    if (methodType == METHOD_DIRECT) {
        resMethod = dvmFindDirectMethod(resClass, name, &proto);
    } else if (methodType == METHOD_STATIC) {
        resMethod = dvmFindDirectMethodHier(resClass, name, &proto);
    } else {
        resMethod = dvmFindVirtualMethodHier(resClass, name, &proto);
    }

    if (resMethod == NULL) {
        dvmThrowException("Ljava/lang/NoSuchMethodError;", name);
        return NULL;
    }

    LOGVV("--- found method %d (%s.%s)\n",
          methodIdx, resClass->descriptor, resMethod->name);

    /* see if this is a pure-abstract method */
    if (dvmIsAbstractMethod(resMethod) && !dvmIsAbstractClass(resClass)) {
        dvmThrowException("Ljava/lang/AbstractMethodError;", name);
        return NULL;
    }

    /*
     * If we're the first to resolve this class, we need to initialize
     * it now.  Only necessary for METHOD_STATIC.
     */
    if (methodType == METHOD_STATIC) {
        if (!dvmIsClassInitialized(resMethod->clazz) &&
                !dvmInitClass(resMethod->clazz))
        {
            assert(dvmCheckException(dvmThreadSelf()));
            return NULL;
        } else {
            assert(!dvmCheckException(dvmThreadSelf()));
        }
    } else {
        /*
         * Edge case: if the <clinit> for a class creates an instance
         * of itself, we will call <init> on a class that is still being
         * initialized by us.
         */
        assert(dvmIsClassInitialized(resMethod->clazz) ||
               dvmIsClassInitializing(resMethod->clazz));
    }

    /*
     * The class is initialized, the method has been found.  Add a pointer
     * to our data structure so we don't have to jump through the hoops again.
     */
    dvmDexSetResolvedMethod(pDvmDex, methodIdx, resMethod);

    return resMethod;
}
Exemplo n.º 24
0
/*
 * Get an array with all methods declared by a class.
 *
 * This includes both static and virtual methods, and can include private
 * members if "publicOnly" is false.  It does not include Miranda methods,
 * since those weren't declared in the class, or constructors.
 */
ArrayObject* dvmGetDeclaredMethods(ClassObject* clazz, bool publicOnly)
{
    if (!dvmIsClassInitialized(gDvm.classJavaLangReflectMethod))
        dvmInitClass(gDvm.classJavaLangReflectMethod);

    /*
     * Count up the #of relevant methods.
     *
     * Ignore virtual Miranda methods and direct class/object constructors.
     */
    size_t count = 0;
    Method* meth = clazz->virtualMethods;
    for (int i = 0; i < clazz->virtualMethodCount; i++, meth++) {
        if ((!publicOnly || dvmIsPublicMethod(meth)) &&
            !dvmIsMirandaMethod(meth))
        {
            count++;
        }
    }
    meth = clazz->directMethods;
    for (int i = 0; i < clazz->directMethodCount; i++, meth++) {
        if ((!publicOnly || dvmIsPublicMethod(meth)) && meth->name[0] != '<') {
            count++;
        }
    }

    /*
     * Create an array of Method objects.
     */
    ArrayObject* methodArray =
        dvmAllocArrayByClass(gDvm.classJavaLangReflectMethodArray, count, ALLOC_DEFAULT);
    if (methodArray == NULL)
        return NULL;

    /*
     * Fill out the array.
     */
    meth = clazz->virtualMethods;
    size_t methObjCount = 0;
    for (int i = 0; i < clazz->virtualMethodCount; i++, meth++) {
        if ((!publicOnly || dvmIsPublicMethod(meth)) &&
            !dvmIsMirandaMethod(meth))
        {
            Object* methObj = dvmCreateReflectMethodObject(meth);
            if (methObj == NULL)
                goto fail;
            dvmSetObjectArrayElement(methodArray, methObjCount, methObj);
            ++methObjCount;
            dvmReleaseTrackedAlloc(methObj, NULL);
        }
    }
    meth = clazz->directMethods;
    for (int i = 0; i < clazz->directMethodCount; i++, meth++) {
        if ((!publicOnly || dvmIsPublicMethod(meth)) &&
            meth->name[0] != '<')
        {
            Object* methObj = dvmCreateReflectMethodObject(meth);
            if (methObj == NULL)
                goto fail;
            dvmSetObjectArrayElement(methodArray, methObjCount, methObj);
            ++methObjCount;
            dvmReleaseTrackedAlloc(methObj, NULL);
        }
    }

    assert(methObjCount == methodArray->length);

    /* caller must call dvmReleaseTrackedAlloc */
    return methodArray;

fail:
    dvmReleaseTrackedAlloc((Object*) methodArray, NULL);
    return NULL;
}
/*
 * Get the address of a field from an object.  This can be used with "get"
 * or "set".
 *
 * "declaringClass" is the class in which the field was declared.  For an
 * instance field, "obj" is the object that holds the field data; for a
 * static field its value is ignored.
 *
 * "If the underlying field is static, the class that declared the
 * field is initialized if it has not already been initialized."
 *
 * On failure, throws an exception and returns NULL.
 *
 * The documentation lists exceptional conditions and the exceptions that
 * should be thrown, but doesn't say which exception previals when two or
 * more exceptional conditions exist at the same time.  For example,
 * attempting to set a protected field from an unrelated class causes an
 * IllegalAccessException, while passing in a data type that doesn't match
 * the field causes an IllegalArgumentException.  If code does both at the
 * same time, we have to choose one or othe other.
 *
 * The expected order is:
 *  (1) Check for illegal access. Throw IllegalAccessException.
 *  (2) Make sure the object actually has the field.  Throw
 *      IllegalArgumentException.
 *  (3) Make sure the field matches the expected type, e.g. if we issued
 *      a "getInteger" call make sure the field is an integer or can be
 *      converted to an int with a widening conversion.  Throw
 *      IllegalArgumentException.
 *  (4) Make sure "obj" is not null.  Throw NullPointerException.
 *
 * TODO: we're currently handling #3 after #4, because we don't check the
 * widening conversion until we're actually extracting the value from the
 * object (which won't work well if it's a null reference).
 */
static JValue* getFieldDataAddr(Object* obj, ClassObject* declaringClass,
                                int slot, bool isSetOperation, bool noAccessCheck)
{
    Field* field;
    JValue* result;

    field = dvmSlotToField(declaringClass, slot);
    assert(field != NULL);

    /* verify access */
    if (!noAccessCheck) {
        if (isSetOperation && dvmIsFinalField(field)) {
            dvmThrowException("Ljava/lang/IllegalAccessException;",
                              "field is marked 'final'");
            return NULL;
        }

        ClassObject* callerClass =
            dvmGetCaller2Class(dvmThreadSelf()->curFrame);

        /*
         * We need to check two things:
         *  (1) Would an instance of the calling class have access to the field?
         *  (2) If the field is "protected", is the object an instance of the
         *      calling class, or is the field's declaring class in the same
         *      package as the calling class?
         *
         * #1 is basic access control.  #2 ensures that, just because
         * you're a subclass of Foo, you can't mess with protected fields
         * in arbitrary Foo objects from other packages.
         */
        if (!dvmCheckFieldAccess(callerClass, field)) {
            dvmThrowException("Ljava/lang/IllegalAccessException;",
                              "access to field not allowed");
            return NULL;
        }
        if (dvmIsProtectedField(field)) {
            bool isInstance, samePackage;

            if (obj != NULL)
                isInstance = dvmInstanceof(obj->clazz, callerClass);
            else
                isInstance = false;
            samePackage = dvmInSamePackage(declaringClass, callerClass);

            if (!isInstance && !samePackage) {
                dvmThrowException("Ljava/lang/IllegalAccessException;",
                                  "access to protected field not allowed");
                return NULL;
            }
        }
    }

    if (dvmIsStaticField(field)) {
        /* init class if necessary, then return ptr to storage in "field" */
        if (!dvmIsClassInitialized(declaringClass)) {
            if (!dvmInitClass(declaringClass)) {
                assert(dvmCheckException(dvmThreadSelf()));
                return NULL;
            }
        }

        result = dvmStaticFieldPtr((StaticField*) field);
    } else {
        /*
         * Verify object is of correct type (i.e. it actually has the
         * expected field in it), then grab a pointer to obj storage.
         * The call to dvmVerifyObjectInClass throws an NPE if "obj" is NULL.
         */
        if (!dvmVerifyObjectInClass(obj, declaringClass)) {
            assert(dvmCheckException(dvmThreadSelf()));
            if (obj != NULL) {
                LOGD("Wrong type of object for field lookup: %s %s\n",
                     obj->clazz->descriptor, declaringClass->descriptor);
            }
            return NULL;
        }
        result = dvmFieldPtr(obj, ((InstField*) field)->byteOffset);
    }

    return result;
}
Exemplo n.º 26
0
/*
 * Create a new java/lang/reflect/Method object, using the contents of
 * "meth" to construct it.
 *
 * The spec doesn't specify the constructor.  We're going to use the
 * one from our existing class libs:
 *
 *  private Method(Class declaring, Class[] paramTypes, Class[] exceptTypes,
 *      Class returnType, String name, int slot)
 *
 * The caller must call dvmReleaseTrackedAlloc() on the result.
 */
Object* dvmCreateReflectMethodObject(const Method* meth)
{
    Object* result = NULL;
    ArrayObject* params = NULL;
    ArrayObject* exceptions = NULL;
    StringObject* nameObj = NULL;
    Object* methObj;
    ClassObject* returnType;
    DexStringCache mangle;
    char* cp;
    int slot, method_idx;

    if (dvmCheckException(dvmThreadSelf())) {
        ALOGW("WARNING: dvmCreateReflectMethodObject called with "
             "exception pending");
        return NULL;
    }

    dexStringCacheInit(&mangle);

    /* parent should guarantee init so we don't have to check on every call */
    assert(dvmIsClassInitialized(gDvm.classJavaLangReflectMethod));

    methObj = dvmAllocObject(gDvm.classJavaLangReflectMethod, ALLOC_DEFAULT);
    if (methObj == NULL)
        goto bail;

    /*
     * Convert the signature string into an array of classes representing
     * the arguments, and a class for the return type.
     */
    cp = dvmCopyDescriptorStringFromMethod(meth, &mangle);
    params = convertSignatureToClassArray(&cp, meth->clazz);
    if (params == NULL)
        goto bail;
    assert(*cp == ')');
    cp++;
    returnType = convertSignaturePartToClass(&cp, meth->clazz);
    if (returnType == NULL)
        goto bail;

    /*
     * Create an array with one entry for every exception that the class
     * is declared to throw.
     */
    exceptions = dvmGetMethodThrows(meth);
    if (dvmCheckException(dvmThreadSelf()))
        goto bail;

    /* method name */
    nameObj = dvmCreateStringFromCstr(meth->name);
    if (nameObj == NULL)
        goto bail;

    slot = methodToSlot(meth);
    method_idx = dvmGetMethodIdx(meth);

    JValue unused;
    dvmCallMethod(dvmThreadSelf(), gDvm.methJavaLangReflectMethod_init,
        methObj, &unused, meth->clazz, params, exceptions, returnType,
        nameObj, slot, method_idx);
    if (dvmCheckException(dvmThreadSelf())) {
        ALOGD("Method class init threw exception");
        goto bail;
    }

    result = methObj;

bail:
    dexStringCacheRelease(&mangle);
    if (result == NULL) {
        assert(dvmCheckException(dvmThreadSelf()));
    }
    dvmReleaseTrackedAlloc((Object*) nameObj, NULL);
    dvmReleaseTrackedAlloc((Object*) params, NULL);
    dvmReleaseTrackedAlloc((Object*) exceptions, NULL);
    if (result == NULL)
        dvmReleaseTrackedAlloc(methObj, NULL);
    return result;
}
/*
 * private Object invokeNative(Object obj, Object[] args, Class declaringClass,
 *   Class[] parameterTypes, Class returnType, int slot, boolean noAccessCheck)
 *
 * Invoke a static or virtual method via reflection.
 */
static void Dalvik_java_lang_reflect_Method_invokeNative(const u4* args,
    JValue* pResult)
{
    // ignore thisPtr in args[0]
    Object* methObj = (Object*) args[1];        // null for static methods
    ArrayObject* argList = (ArrayObject*) args[2];
    ClassObject* declaringClass = (ClassObject*) args[3];
    ArrayObject* params = (ArrayObject*) args[4];
    ClassObject* returnType = (ClassObject*) args[5];
    int slot = args[6];
    bool noAccessCheck = (args[7] != 0);
    const Method* meth;
    Object* result;

    /*
     * "If the underlying method is static, the class that declared the
     * method is initialized if it has not already been initialized."
     */
    meth = dvmSlotToMethod(declaringClass, slot);
    assert(meth != NULL);

    if (dvmIsStaticMethod(meth)) {
        if (!dvmIsClassInitialized(declaringClass)) {
            if (!dvmInitClass(declaringClass))
                goto init_failed;
        }
    } else {
        /* looks like interfaces need this too? */
        if (dvmIsInterfaceClass(declaringClass) &&
            !dvmIsClassInitialized(declaringClass))
        {
            if (!dvmInitClass(declaringClass))
                goto init_failed;
        }

        /* make sure the object is an instance of the expected class */
        if (!dvmVerifyObjectInClass(methObj, declaringClass)) {
            assert(dvmCheckException(dvmThreadSelf()));
            RETURN_VOID();
        }

        /* do the virtual table lookup for the method */
        meth = dvmGetVirtualizedMethod(methObj->clazz, meth);
        if (meth == NULL) {
            assert(dvmCheckException(dvmThreadSelf()));
            RETURN_VOID();
        }
    }

    /*
     * If the method has a return value, "result" will be an object or
     * a boxed primitive.
     */
    result = dvmInvokeMethod(methObj, meth, argList, params, returnType,
                noAccessCheck);

    RETURN_PTR(result);

init_failed:
    /*
     * If initialization failed, an exception will be raised.
     */
    ALOGD("Method.invoke() on bad class %s failed",
        declaringClass->descriptor);
    assert(dvmCheckException(dvmThreadSelf()));
    RETURN_VOID();
}
Exemplo n.º 28
0
/*
 * Create a new java/lang/reflect/Constructor object, using the contents of
 * "meth" to construct it.
 *
 * The spec doesn't specify the constructor.  We're going to use the
 * one from our existing class libs:
 *
 *  private Constructor (Class declaringClass, Class[] ptypes, Class[] extypes,
 *      int slot)
 */
static Object* createConstructorObject(Method* meth)
{
    Object* result = NULL;
    ArrayObject* params = NULL;
    ArrayObject* exceptions = NULL;
    Object* consObj;
    DexStringCache mangle;
    char* cp;
    int slot, method_idx;

    dexStringCacheInit(&mangle);

    /* parent should guarantee init so we don't have to check on every call */
    assert(dvmIsClassInitialized(gDvm.classJavaLangReflectConstructor));

    consObj = dvmAllocObject(gDvm.classJavaLangReflectConstructor,
                ALLOC_DEFAULT);
    if (consObj == NULL)
        goto bail;

    /*
     * Convert the signature string into an array of classes representing
     * the arguments.
     */
    cp = dvmCopyDescriptorStringFromMethod(meth, &mangle);
    params = convertSignatureToClassArray(&cp, meth->clazz);
    if (params == NULL)
        goto bail;
    assert(*cp == ')');
    assert(*(cp+1) == 'V');

    /*
     * Create an array with one entry for every exception that the class
     * is declared to throw.
     */
    exceptions = dvmGetMethodThrows(meth);
    if (dvmCheckException(dvmThreadSelf()))
        goto bail;

    slot = methodToSlot(meth);
    method_idx = dvmGetMethodIdx(meth);

    JValue unused;
    dvmCallMethod(dvmThreadSelf(), gDvm.methJavaLangReflectConstructor_init,
        consObj, &unused, meth->clazz, params, exceptions, slot, method_idx);
    if (dvmCheckException(dvmThreadSelf())) {
        ALOGD("Constructor class init threw exception");
        goto bail;
    }

    result = consObj;

bail:
    dexStringCacheRelease(&mangle);
    dvmReleaseTrackedAlloc((Object*) params, NULL);
    dvmReleaseTrackedAlloc((Object*) exceptions, NULL);
    if (result == NULL) {
        assert(dvmCheckException(dvmThreadSelf()));
        dvmReleaseTrackedAlloc(consObj, NULL);
    }
    /* caller must dvmReleaseTrackedAlloc(result) */
    return result;
}
Exemplo n.º 29
0
/*
 *
 * Get an array with all fields declared by a class.
 *
 * This includes both static and instance fields.
 */
ArrayObject* dvmGetDeclaredFields(ClassObject* clazz, bool publicOnly)
{
    if (!dvmIsClassInitialized(gDvm.classJavaLangReflectField))
        dvmInitClass(gDvm.classJavaLangReflectField);

    /* count #of fields */
    size_t count;
    if (!publicOnly)
        count = clazz->sfieldCount + clazz->ifieldCount;
    else {
        count = 0;
        for (int i = 0; i < clazz->sfieldCount; i++) {
            if ((clazz->sfields[i].accessFlags & ACC_PUBLIC) != 0)
                count++;
        }
        for (int i = 0; i < clazz->ifieldCount; i++) {
            if ((clazz->ifields[i].accessFlags & ACC_PUBLIC) != 0)
                count++;
        }
    }

    /* create the Field[] array */
    ArrayObject* fieldArray =
        dvmAllocArrayByClass(gDvm.classJavaLangReflectFieldArray, count, ALLOC_DEFAULT);
    if (fieldArray == NULL)
        return NULL;

    /* populate */
    size_t fieldCount = 0;
    for (int i = 0; i < clazz->sfieldCount; i++) {
        if (!publicOnly ||
            (clazz->sfields[i].accessFlags & ACC_PUBLIC) != 0)
        {
            Object* field = createFieldObject(&clazz->sfields[i], clazz);
            if (field == NULL) {
                goto fail;
            }
            dvmSetObjectArrayElement(fieldArray, fieldCount, field);
            dvmReleaseTrackedAlloc(field, NULL);
            ++fieldCount;
        }
    }
    for (int i = 0; i < clazz->ifieldCount; i++) {
        if (!publicOnly ||
            (clazz->ifields[i].accessFlags & ACC_PUBLIC) != 0)
        {
            Object* field = createFieldObject(&clazz->ifields[i], clazz);
            if (field == NULL) {
                goto fail;
            }
            dvmSetObjectArrayElement(fieldArray, fieldCount, field);
            dvmReleaseTrackedAlloc(field, NULL);
            ++fieldCount;
        }
    }

    assert(fieldCount == fieldArray->length);

    /* caller must call dvmReleaseTrackedAlloc */
    return fieldArray;

fail:
    dvmReleaseTrackedAlloc((Object*) fieldArray, NULL);
    return NULL;
}
Exemplo n.º 30
0
/*
 * Generate an array of StackTraceElement objects from the raw integer
 * data encoded by dvmFillInStackTrace().
 *
 * "intVals" points to the first {method,pc} pair.
 *
 * The returned array is not added to the "local refs" list.
 */
ArrayObject* dvmGetStackTraceRaw(const int* intVals, int stackDepth)
{
    ArrayObject* steArray = NULL;
    int i;

    /* init this if we haven't yet */
    if (!dvmIsClassInitialized(gDvm.classJavaLangStackTraceElement))
        dvmInitClass(gDvm.classJavaLangStackTraceElement);

    /* allocate a StackTraceElement array */
    steArray = dvmAllocArray(gDvm.classJavaLangStackTraceElementArray,
                    stackDepth, kObjectArrayRefWidth, ALLOC_DEFAULT);
    if (steArray == NULL)
        goto bail;

    /*
     * Allocate and initialize a StackTraceElement for each stack frame.
     * We use the standard constructor to configure the object.
     */
    for (i = 0; i < stackDepth; i++) {
        Object* ste;
        Method* meth;
        StringObject* className;
        StringObject* methodName;
        StringObject* fileName;
        int lineNumber, pc;
        const char* sourceFile;
        char* dotName;

        ste = dvmAllocObject(gDvm.classJavaLangStackTraceElement,ALLOC_DEFAULT);
        if (ste == NULL)
            goto bail;

        meth = (Method*) *intVals++;
        pc = *intVals++;

        if (pc == -1)      // broken top frame?
            lineNumber = 0;
        else
            lineNumber = dvmLineNumFromPC(meth, pc);

        dotName = dvmDescriptorToDot(meth->clazz->descriptor);
        className = dvmCreateStringFromCstr(dotName);
        free(dotName);

        methodName = dvmCreateStringFromCstr(meth->name);
        sourceFile = dvmGetMethodSourceFile(meth);
        if (sourceFile != NULL)
            fileName = dvmCreateStringFromCstr(sourceFile);
        else
            fileName = NULL;

        /*
         * Invoke:
         *  public StackTraceElement(String declaringClass, String methodName,
         *      String fileName, int lineNumber)
         * (where lineNumber==-2 means "native")
         */
        JValue unused;
        dvmCallMethod(dvmThreadSelf(), gDvm.methJavaLangStackTraceElement_init,
            ste, &unused, className, methodName, fileName, lineNumber);

        dvmReleaseTrackedAlloc(ste, NULL);
        dvmReleaseTrackedAlloc((Object*) className, NULL);
        dvmReleaseTrackedAlloc((Object*) methodName, NULL);
        dvmReleaseTrackedAlloc((Object*) fileName, NULL);

        if (dvmCheckException(dvmThreadSelf()))
            goto bail;

        dvmSetObjectArrayElement(steArray, i, ste);
    }

bail:
    dvmReleaseTrackedAlloc((Object*) steArray, NULL);
    return steArray;
}