C++ dvmReleaseTrackedAlloc函数代码示例

/*
 * Create some "stock" exceptions.  These can be thrown when the system is
 * too screwed up to allocate and initialize anything, or when we don't
 * need a meaningful stack trace.
 *
 * We can't do this during the initial startup because we need to execute
 * the constructors.
 */
bool dvmCreateStockExceptions()
{
    /*
     * Pre-allocate some throwables.  These need to be explicitly added
     * to the GC's root set (see dvmHeapMarkRootSet()).
     */
    gDvm.outOfMemoryObj = createStockException("Ljava/lang/OutOfMemoryError;",
        "[memory exhausted]");
    dvmReleaseTrackedAlloc(gDvm.outOfMemoryObj, NULL);
    gDvm.internalErrorObj = createStockException("Ljava/lang/InternalError;",
        "[pre-allocated]");
    dvmReleaseTrackedAlloc(gDvm.internalErrorObj, NULL);
    gDvm.noClassDefFoundErrorObj =
        createStockException("Ljava/lang/NoClassDefFoundError;",
            "[generic]");
    dvmReleaseTrackedAlloc(gDvm.noClassDefFoundErrorObj, NULL);

    if (gDvm.outOfMemoryObj == NULL || gDvm.internalErrorObj == NULL ||
        gDvm.noClassDefFoundErrorObj == NULL)
    {
        LOGW("Unable to create stock exceptions");
        return false;
    }

    return true;
}

/*
 * 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;
}

/*
 * Create a "stock instance" of an exception class.
 */
static Object* createStockException(const char* descriptor, const char* msg)
{
    Thread* self = dvmThreadSelf();
    StringObject* msgStr = NULL;
    ClassObject* clazz;
    Method* init;
    Object* obj;

    /* find class, initialize if necessary */
    clazz = dvmFindSystemClass(descriptor);
    if (clazz == NULL) {
        LOGE("Unable to find %s", descriptor);
        return NULL;
    }

    init = dvmFindDirectMethodByDescriptor(clazz, "<init>",
            "(Ljava/lang/String;)V");
    if (init == NULL) {
        LOGE("Unable to find String-arg constructor for %s", descriptor);
        return NULL;
    }

    obj = dvmAllocObject(clazz, ALLOC_DEFAULT);
    if (obj == NULL)
        return NULL;

    if (msg == NULL) {
        msgStr = NULL;
    } else {
        msgStr = dvmCreateStringFromCstr(msg);
        if (msgStr == NULL) {
            LOGW("Could not allocate message string \"%s\"", msg);
            dvmReleaseTrackedAlloc(obj, self);
            return NULL;
        }
    }

    JValue unused;
    dvmCallMethod(self, init, obj, &unused, msgStr);
    if (dvmCheckException(self)) {
        dvmReleaseTrackedAlloc((Object*) msgStr, self);
        dvmReleaseTrackedAlloc(obj, self);
        return NULL;
    }

    dvmReleaseTrackedAlloc((Object*) msgStr, self);     // okay if msgStr NULL
    return obj;
}

java_lang_String_ap fastiva_Dalvik_dalvik_system_VMRuntime_properties(dalvik_system_VMRuntime_p self) {
#endif

    ArrayObject* result = dvmCreateStringArray(*gDvm.properties);
    dvmReleaseTrackedAlloc((Object*) result, dvmThreadSelf());
    RETURN_PTR((java_lang_String_ap)result);
}

java_lang_String_p fastiva_Dalvik_java_lang_System_mapLibraryName(java_lang_String_p nameObj) {
#endif

	StringObject* result = NULL;
    char* name;
    char* mappedName;

    if (nameObj == NULL) {
        dvmThrowNullPointerException("userLibName == null");
        THROW_V();
    }

    name = dvmCreateCstrFromString(nameObj);

#ifdef _DEBUG
	assert(strstr(name, "cfb") == NULL);
#endif


    mappedName = dvmCreateSystemLibraryName(name);
    if (mappedName != NULL) {
        result = dvmCreateStringFromCstr(mappedName);
        dvmReleaseTrackedAlloc((Object*) result, NULL);
    }

    free(name);
    free(mappedName);
    RETURN_PTR((java_lang_String_p)result);
}

static void Dalvik_dalvik_system_VMRuntime_properties(const u4* args,
    JValue* pResult)
{
    ArrayObject* result = dvmCreateStringArray(*gDvm.properties);
    dvmReleaseTrackedAlloc((Object*) result, dvmThreadSelf());
    RETURN_PTR(result);
}

java_lang_Object_p fastiva_Dalvik_dalvik_system_VMRuntime_newNonMovableArray(dalvik_system_VMRuntime_p self, java_lang_Class_p elementClass, jint length) {
#endif

	if (elementClass == NULL) {
        dvmThrowNullPointerException("elementClass == null");
        THROW_V();
    }
    if (length < 0) {
        dvmThrowNegativeArraySizeException(length);
        THROW_V();
    }

    // TODO: right now, we don't have a copying collector, so there's no need
    // to do anything special here, but we ought to pass the non-movability
    // through to the allocator.
    ClassObject* arrayClass = dvmFindArrayClassForElement(elementClass);
    ArrayObject* newArray = dvmAllocArrayByClass(arrayClass,
                                                 length,
                                                 ALLOC_NON_MOVING);
    if (newArray == NULL) {
        assert(dvmCheckException(dvmThreadSelf()));
        THROW_V();
    }
    dvmReleaseTrackedAlloc((Object*) newArray, NULL);

    RETURN_PTR(newArray);
}

static void Dalvik_dalvik_system_VMRuntime_newNonMovableArray(const u4* args,
    JValue* pResult)
{
    ClassObject* elementClass = (ClassObject*) args[1];
    int length = args[2];

    if (elementClass == NULL) {
        dvmThrowNullPointerException("elementClass == null");
        RETURN_VOID();
    }
    if (length < 0) {
        dvmThrowNegativeArraySizeException(length);
        RETURN_VOID();
    }

    // TODO: right now, we don't have a copying collector, so there's no need
    // to do anything special here, but we ought to pass the non-movability
    // through to the allocator.
    ClassObject* arrayClass = dvmFindArrayClassForElement(elementClass);
    ArrayObject* newArray = dvmAllocArrayByClass(arrayClass,
                                                 length,
                                                 ALLOC_NON_MOVING);
    if (newArray == NULL) {
        assert(dvmCheckException(dvmThreadSelf()));
        RETURN_VOID();
    }
    dvmReleaseTrackedAlloc((Object*) newArray, NULL);

    RETURN_PTR(newArray);
}

/*
 * private Object getField(Object o, Class declaringClass, Class type,
 *     int slot, boolean noAccessCheck)
 *
 * Primitive types need to be boxed.
 */
static void Dalvik_java_lang_reflect_Field_getField(const u4* args,
        JValue* pResult)
{
    // ignore thisPtr in args[0]
    Object* obj = (Object*) args[1];
    ClassObject* declaringClass = (ClassObject*) args[2];
    ClassObject* fieldType = (ClassObject*) args[3];
    int slot = args[4];
    bool noAccessCheck = (args[5] != 0);
    JValue value;
    const JValue* fieldPtr;
    DataObject* result;

    //dvmDumpClass(obj->clazz, kDumpClassFullDetail);

    /* get a pointer to the field's data; performs access checks */
    fieldPtr = getFieldDataAddr(obj, declaringClass, slot, false,noAccessCheck);
    if (fieldPtr == NULL)
        RETURN_VOID();

    /* copy 4 or 8 bytes out */
    if (fieldType->primitiveType == PRIM_LONG ||
            fieldType->primitiveType == PRIM_DOUBLE)
    {
        value.j = fieldPtr->j;
    } else {
        value.i = fieldPtr->i;
    }

    result = dvmWrapPrimitive(value, fieldType);
    dvmReleaseTrackedAlloc((Object*) result, NULL);
    RETURN_PTR(result);
}

/*
 * 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;
}

/*
 * private static String[] getClassNameList(int cookie)
 *
 * Returns a String array that holds the names of all classes in the
 * specified DEX file.
 */
static void Dalvik_dalvik_system_DexFile_getClassNameList(const u4* args,
    JValue* pResult)
{
    int cookie = args[0];
    DexOrJar* pDexOrJar = (DexOrJar*) cookie;
    DvmDex* pDvmDex;
    DexFile* pDexFile;
    ArrayObject* stringArray;
    Thread* self = dvmThreadSelf();

    if (!validateCookie(cookie))
        RETURN_VOID();

    if (pDexOrJar->isDex)
        pDvmDex = dvmGetRawDexFileDex(pDexOrJar->pRawDexFile);
    else
        pDvmDex = dvmGetJarFileDex(pDexOrJar->pJarFile);
    assert(pDvmDex != NULL);
    pDexFile = pDvmDex->pDexFile;

    int count = pDexFile->pHeader->classDefsSize;
    stringArray = dvmAllocObjectArray(gDvm.classJavaLangString, count,
                    ALLOC_DEFAULT);
    if (stringArray == NULL) {
        /* probably OOM */
        ALOGD("Failed allocating array of %d strings\n", count);
        assert(dvmCheckException(self));
        RETURN_VOID();
    }

    int i;
    for (i = 0; i < count; i++) {
        const DexClassDef* pClassDef = dexGetClassDef(pDexFile, i);
        const char* descriptor =
            dexStringByTypeIdx(pDexFile, pClassDef->classIdx);

        char* className = dvmDescriptorToDot(descriptor);
        StringObject* str = dvmCreateStringFromCstr(className);
        dvmSetObjectArrayElement(stringArray, i, (Object *)str);
        dvmReleaseTrackedAlloc((Object *)str, self);
        free(className);
    }

    dvmReleaseTrackedAlloc((Object*)stringArray, self);
    RETURN_PTR(stringArray);
}

/*
 * Convert an array of char* into a String[].
 *
 * Returns NULL on failure, with an exception raised.
 */
static ArrayObject* convertStringArray(char** strings, size_t count)
{
    Thread* self = dvmThreadSelf();

    /*
     * Allocate an array to hold the String objects.
     */
    ClassObject* stringArrayClass =
        dvmFindArrayClass("[Ljava/lang/String;", NULL);
    if (stringArrayClass == NULL) {
        /* shouldn't happen */
        LOGE("Unable to find [Ljava/lang/String;\n");
        dvmAbort();
    }

    ArrayObject* stringArray =
        dvmAllocArrayByClass(stringArrayClass, count, ALLOC_DEFAULT);
    if (stringArray == NULL) {
        /* probably OOM */
        LOGD("Failed allocating array of %d strings\n", count);
        assert(dvmCheckException(self));
        return NULL;
    }

    /*
     * Create the individual String objects and add them to the array.
     */
    size_t i;
    for (i = 0; i < count; i++) {
        Object *str =
            (Object *)dvmCreateStringFromCstr(strings[i]);
        if (str == NULL) {
            /* probably OOM; drop out now */
            assert(dvmCheckException(self));
            dvmReleaseTrackedAlloc((Object*)stringArray, self);
            return NULL;
        }
        dvmSetObjectArrayElement(stringArray, i, str);
        /* stored in tracked array, okay to release */
        dvmReleaseTrackedAlloc(str, self);
    }

    dvmReleaseTrackedAlloc((Object*)stringArray, self);
    return stringArray;
}

/*
 * public static byte[] getThreadStats()
 *
 * Get a buffer full of thread info.
 */
static void Dalvik_org_apache_harmony_dalvik_ddmc_DdmVmInternal_getThreadStats(
    const u4* args, JValue* pResult)
{
    UNUSED_PARAMETER(args);

    ArrayObject* result = dvmDdmGenerateThreadStats();
    dvmReleaseTrackedAlloc((Object*) result, NULL);
    RETURN_PTR(result);
}

/*
 * private Object internalClone()
 *
 * Implements most of Object.clone().
 */
static void Dalvik_java_lang_Object_internalClone(const u4* args,
    JValue* pResult)
{
    Object* thisPtr = (Object*) args[0];
    Object* clone = dvmCloneObject(thisPtr);

    dvmReleaseTrackedAlloc(clone, NULL);
    RETURN_PTR(clone);
}

/*
 * private static Object[] getClassSignatureAnnotation(Class clazz)
 *
 * Return the Signature annotation for the specified class.  Equivalent to
 * Class.getSignatureAnnotation(), but available to java.lang.reflect.
 */
static void Dalvik_java_lang_reflect_AccessibleObject_getClassSignatureAnnotation(
    const u4* args, JValue* pResult)
{
    ClassObject* clazz = (ClassObject*) args[0];
    ArrayObject* arr = dvmGetClassSignatureAnnotation(clazz);

    dvmReleaseTrackedAlloc((Object*) arr, NULL);
    RETURN_PTR(arr);
}