/*
* Try to load all classes in the specified DEX. If they have some sort
* of broken dependency, e.g. their superclass lives in a different DEX
* that wasn't previously loaded into the bootstrap class path, loading
* will fail. This is the desired behavior.
*
* We have no notion of class loader at this point, so we load all of
* the classes with the bootstrap class loader. It turns out this has
* exactly the behavior we want, and has no ill side effects because we're
* running in a separate process and anything we load here will be forgotten.
*
* We set the CLASS_MULTIPLE_DEFS flag here if we see multiple definitions.
* This works because we only call here as part of optimization / pre-verify,
* not during verification as part of loading a class into a running VM.
*
* This returns "false" if the world is too screwed up to do anything
* useful at all.
*/
static bool loadAllClasses(DvmDex* pDvmDex)
{
u4 count = pDvmDex->pDexFile->pHeader->classDefsSize;
u4 idx;
int loaded = 0;
LOGV("DexOpt: +++ trying to load %d classes\n", count);
dvmSetBootPathExtraDex(pDvmDex);
/*
* We have some circularity issues with Class and Object that are most
* easily avoided by ensuring that Object is never the first thing we
* try to find. Take care of that here. (We only need to do this when
* loading classes from the DEX file that contains Object, and only
* when Object comes first in the list, but it costs very little to
* do it in all cases.)
*/
if (dvmFindSystemClass("Ljava/lang/Class;") == NULL) {
LOGE("ERROR: java.lang.Class does not exist!\n");
return false;
}
for (idx = 0; idx < count; idx++) {
const DexClassDef* pClassDef;
const char* classDescriptor;
ClassObject* newClass;
pClassDef = dexGetClassDef(pDvmDex->pDexFile, idx);
classDescriptor =
dexStringByTypeIdx(pDvmDex->pDexFile, pClassDef->classIdx);
LOGV("+++ loading '%s'", classDescriptor);
//newClass = dvmDefineClass(pDexFile, classDescriptor,
// NULL);
newClass = dvmFindSystemClassNoInit(classDescriptor);
if (newClass == NULL) {
LOGV("DexOpt: failed loading '%s'\n", classDescriptor);
dvmClearOptException(dvmThreadSelf());
} else if (newClass->pDvmDex != pDvmDex) {
/*
* We don't load the new one, and we tag the first one found
* with the "multiple def" flag so the resolver doesn't try
* to make it available.
*/
LOGD("DexOpt: '%s' has an earlier definition; blocking out\n",
classDescriptor);
SET_CLASS_FLAG(newClass, CLASS_MULTIPLE_DEFS);
} else {
loaded++;
}
}
LOGV("DexOpt: +++ successfully loaded %d classes\n", loaded);
dvmSetBootPathExtraDex(NULL);
return true;
}
/*
* 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;
}
bool dvmGcStartupClasses()
{
ClassObject *klass = dvmFindSystemClass("Ljava/lang/Daemons;");
if (klass == NULL) {
return false;
}
Method *method = dvmFindDirectMethodByDescriptor(klass, "start", "()V");
if (method == NULL) {
return false;
}
Thread *self = dvmThreadSelf();
assert(self != NULL);
JValue unusedResult;
dvmCallMethod(self, method, NULL, &unusedResult);
return true;
}
/*
* Wrap the now-pending exception in a different exception. This is useful
* for reflection stuff that wants to hand a checked exception back from a
* method that doesn't declare it.
*
* If something fails, an (unchecked) exception related to that failure
* will be pending instead.
*/
void dvmWrapException(const char* newExcepStr)
{
Thread* self = dvmThreadSelf();
Object* origExcep;
ClassObject* iteClass;
origExcep = dvmGetException(self);
dvmAddTrackedAlloc(origExcep, self); // don't let the GC free it
dvmClearException(self); // clear before class lookup
iteClass = dvmFindSystemClass(newExcepStr);
if (iteClass != NULL) {
Object* iteExcep;
Method* initMethod;
iteExcep = dvmAllocObject(iteClass, ALLOC_DEFAULT);
if (iteExcep != NULL) {
initMethod = dvmFindDirectMethodByDescriptor(iteClass, "<init>",
"(Ljava/lang/Throwable;)V");
if (initMethod != NULL) {
JValue unused;
dvmCallMethod(self, initMethod, iteExcep, &unused,
origExcep);
/* if <init> succeeded, replace the old exception */
if (!dvmCheckException(self))
dvmSetException(self, iteExcep);
}
dvmReleaseTrackedAlloc(iteExcep, NULL);
/* if initMethod doesn't exist, or failed... */
if (!dvmCheckException(self))
dvmSetException(self, origExcep);
} else {
/* leave OutOfMemoryError pending */
}
} else {
/* leave ClassNotFoundException pending */
}
assert(dvmCheckException(self));
dvmReleaseTrackedAlloc(origExcep, self);
}
/*
* Create a wrapper object for a primitive data type. If "returnType" is
* not primitive, this just casts "value" to an object and returns it.
*
* We could invoke the "toValue" method on the box types to take
* advantage of pre-created values, but running that through the
* interpreter is probably less efficient than just allocating storage here.
*
* The caller must call dvmReleaseTrackedAlloc on the result.
*/
DataObject* dvmBoxPrimitive(JValue value, ClassObject* returnType)
{
ClassObject* wrapperClass;
DataObject* wrapperObj;
s4* dataPtr;
PrimitiveType typeIndex = returnType->primitiveType;
const char* classDescriptor;
if (typeIndex == PRIM_NOT) {
/* add to tracking table so return value is always in table */
if (value.l != NULL)
dvmAddTrackedAlloc((Object*)value.l, NULL);
return (DataObject*) value.l;
}
classDescriptor = dexGetBoxedTypeDescriptor(typeIndex);
if (classDescriptor == NULL) {
return NULL;
}
wrapperClass = dvmFindSystemClass(classDescriptor);
if (wrapperClass == NULL) {
ALOGW("Unable to find '%s'", classDescriptor);
assert(dvmCheckException(dvmThreadSelf()));
return NULL;
}
wrapperObj = (DataObject*) dvmAllocObject(wrapperClass, ALLOC_DEFAULT);
if (wrapperObj == NULL)
return NULL;
dataPtr = (s4*) wrapperObj->instanceData;
/* assumes value is stored in first instance field */
/* (see dvmValidateBoxClasses) */
if (typeIndex == PRIM_LONG || typeIndex == PRIM_DOUBLE)
*(s8*)dataPtr = value.j;
else
*dataPtr = value.i;
return wrapperObj;
}
/*
* Create a Throwable and throw an exception in the current thread (where
* "throwing" just means "set the thread's exception pointer").
*
* "msg" and/or "cause" may be NULL.
*
* If we have a bad exception hierarchy -- something in Throwable.<init>
* is missing -- then every attempt to throw an exception will result
* in another exception. Exceptions are generally allowed to "chain"
* to other exceptions, so it's hard to auto-detect this problem. It can
* only happen if the system classes are broken, so it's probably not
* worth spending cycles to detect it.
*
* We do have one case to worry about: if the classpath is completely
* wrong, we'll go into a death spin during startup because we can't find
* the initial class and then we can't find NoClassDefFoundError. We have
* to handle this case.
*
* [Do we want to cache pointers to common exception classes?]
*/
void dvmThrowChainedException(const char* exceptionDescriptor, const char* msg,
Object* cause)
{
ClassObject* excepClass;
LOGV("THROW '%s' msg='%s' cause=%s\n",
exceptionDescriptor, msg,
(cause != NULL) ? cause->clazz->descriptor : "(none)");
if (gDvm.initializing) {
if (++gDvm.initExceptionCount >= 2) {
LOGE("Too many exceptions during init (failed on '%s' '%s')\n",
exceptionDescriptor, msg);
dvmAbort();
}
}
excepClass = dvmFindSystemClass(exceptionDescriptor);
if (excepClass == NULL) {
/*
* We couldn't find the exception class. The attempt to find a
* nonexistent class should have raised an exception. If no
* exception is currently raised, then we're pretty clearly unable
* to throw ANY sort of exception, and we need to pack it in.
*
* If we were able to throw the "class load failed" exception,
* stick with that. Ideally we'd stuff the original exception
* into the "cause" field, but since we can't find it we can't
* do that. The exception class name should be in the "message"
* field.
*/
if (!dvmCheckException(dvmThreadSelf())) {
LOGE("FATAL: unable to throw exception (failed on '%s' '%s')\n",
exceptionDescriptor, msg);
dvmAbort();
}
return;
}
dvmThrowChainedExceptionByClass(excepClass, msg, cause);
}
static bool initFinalizerReference()
{
gDvm.classJavaLangRefFinalizerReference =
dvmFindSystemClass("Ljava/lang/ref/FinalizerReference;");
return gDvm.classJavaLangRefFinalizerReference != NULL;
}
