@Uninterruptible
public static void dumpRef(ObjectReference ref) {
VM.sysWrite("REF=");
if (ref.isNull()) {
VM.sysWrite("NULL\n");
return;
}
VM.sysWrite(ref);
if (!mappedVMRef(ref)) {
VM.sysWrite(" (REF OUTSIDE OF HEAP OR NOT MAPPED)\n");
return;
}
ObjectModel.dumpHeader(ref);
ObjectReference tib = ObjectReference.fromObject(ObjectModel.getTIB(ref));
if (!MemoryManager.mightBeTIB(tib)) {
VM.sysWrite(" (INVALID TIB: CLASS NOT ACCESSIBLE)\n");
return;
}
RVMType type = Magic.getObjectType(ref.toObject());
ObjectReference itype = ObjectReference.fromObject(type);
VM.sysWrite(" TYPE=");
VM.sysWrite(itype);
if (!validType(itype)) {
VM.sysWrite(" (INVALID TYPE: CLASS NOT ACCESSIBLE)\n");
return;
}
VM.sysWrite(" CLASS=");
VM.sysWrite(type.getDescriptor());
VM.sysWrite("\n");
}
@Interruptible
static void boot(BootRecord theBootRecord) {
// get addresses of TIBs for RVMArray & RVMClass used for testing Type ptrs
RVMType t = RVMArray.IntArray;
tibForArrayType = ObjectModel.getTIB(t);
tibForPrimitiveType = ObjectModel.getTIB(RVMType.IntType);
t = Magic.getObjectType(BootRecord.the_boot_record);
tibForClassType = ObjectModel.getTIB(t);
}
/** Fallback */
public static void fallback(Object object, TransitiveClosure trace) {
ObjectReference objectRef = ObjectReference.fromObject(object);
RVMType type = ObjectModel.getObjectType(objectRef.toObject());
if (type.isClassType()) {
RVMClass klass = type.asClass();
int[] offsets = klass.getReferenceOffsets();
for (int i = 0; i < offsets.length; i++) {
trace.processEdge(objectRef, objectRef.toAddress().plus(offsets[i]));
}
} else if (type.isArrayType() && type.asArray().getElementType().isReferenceType()) {
for (int i = 0; i < ObjectModel.getArrayLength(objectRef.toObject()); i++) {
trace.processEdge(objectRef, objectRef.toAddress().plus(i << LOG_BYTES_IN_ADDRESS));
}
}
}
/** Reports the state of a heavy-weight lock, via {@link VM#sysWrite}. */
private void dump() {
if (!active) {
return;
}
VM.sysWrite("Lock ");
VM.sysWriteInt(index);
VM.sysWrite(":\n");
VM.sysWrite(" lockedObject: ");
VM.sysWriteHex(Magic.objectAsAddress(lockedObject));
VM.sysWrite(" thin lock = ");
VM.sysWriteHex(
Magic.objectAsAddress(lockedObject).loadAddress(ObjectModel.defaultThinLockOffset()));
VM.sysWrite(" object type = ");
VM.sysWrite(Magic.getObjectType(lockedObject).getDescriptor());
VM.sysWriteln();
VM.sysWrite(" ownerId: ");
VM.sysWriteInt(ownerId);
VM.sysWrite(" (");
VM.sysWriteInt(ownerId >>> ThinLockConstants.TL_THREAD_ID_SHIFT);
VM.sysWrite(") recursionCount: ");
VM.sysWriteInt(recursionCount);
VM.sysWriteln();
dumpBlockedThreads();
dumpWaitingThreads();
VM.sysWrite(" mutexLatestContender: ");
if (mutex.latestContender == null) {
VM.sysWrite("<null>");
} else {
VM.sysWriteInt(mutex.latestContender.getThreadSlot());
}
VM.sysWrite("\n");
}
/** Reference Arrays */
public static void referenceArray(Object object, TransitiveClosure trace) {
Address base = Magic.objectAsAddress(object);
int length = ObjectModel.getArrayLength(object);
for (int i = 0; i < length; i++) {
trace.processEdge(ObjectReference.fromObject(object), base.plus(i << LOG_BYTES_IN_ADDRESS));
}
}
/** All Scalars */
public static void scalar(Object object, TransitiveClosure trace) {
Address base = Magic.objectAsAddress(object);
int[] offsets = ObjectModel.getObjectType(object).asClass().getReferenceOffsets();
for (int i = 0; i < offsets.length; i++) {
trace.processEdge(ObjectReference.fromObject(object), base.plus(offsets[i]));
}
}
/**
* Check if an address appears to point to an instance of RVMType
*
* @param typeAddress the address to check
* @return {@code true} if and only if the address appears to be an an instance of RVMType
*/
@Uninterruptible
public static boolean validType(ObjectReference typeAddress) {
if (!Space.isMappedObject(typeAddress)) {
return false; // type address is outside of heap
}
// check if types tib is one of three possible values
TIB typeTib = ObjectModel.getTIB(typeAddress);
return ((typeTib == tibForClassType)
|| (typeTib == tibForArrayType)
|| (typeTib == tibForPrimitiveType));
}
@Uninterruptible
public static boolean validRef(ObjectReference ref) {
if (ref.isNull()) return true;
if (!Space.isMappedObject(ref)) {
VM.sysWrite("validRef: REF outside heap, ref = ");
VM.sysWrite(ref);
VM.sysWrite("\n");
Space.printVMMap();
return false;
}
if (MOVES_OBJECTS) {
/*
TODO: Work out how to check if forwarded
if (Plan.isForwardedOrBeingForwarded(ref)) {
// TODO: actually follow forwarding pointer
// (need to bound recursion when things are broken!!)
return true;
}
*/
}
TIB tib = ObjectModel.getTIB(ref);
Address tibAddr = Magic.objectAsAddress(tib);
if (!Space.isMappedObject(ObjectReference.fromObject(tib))) {
VM.sysWrite("validRef: TIB outside heap, ref = ");
VM.sysWrite(ref);
VM.sysWrite(" tib = ");
VM.sysWrite(tibAddr);
VM.sysWrite("\n");
ObjectModel.dumpHeader(ref);
return false;
}
if (tibAddr.isZero()) {
VM.sysWrite("validRef: TIB is Zero! ");
VM.sysWrite(ref);
VM.sysWrite("\n");
ObjectModel.dumpHeader(ref);
return false;
}
if (tib.length() == 0) {
VM.sysWrite("validRef: TIB length zero, ref = ");
VM.sysWrite(ref);
VM.sysWrite(" tib = ");
VM.sysWrite(tibAddr);
VM.sysWrite("\n");
ObjectModel.dumpHeader(ref);
return false;
}
ObjectReference type = ObjectReference.fromObject(tib.getType());
if (!validType(type)) {
VM.sysWrite("validRef: invalid TYPE, ref = ");
VM.sysWrite(ref);
VM.sysWrite(" tib = ");
VM.sysWrite(Magic.objectAsAddress(tib));
VM.sysWrite(" type = ");
VM.sysWrite(type);
VM.sysWrite("\n");
ObjectModel.dumpHeader(ref);
return false;
}
return true;
} // validRef
