Examples with ObjectReference org.vmmagic.unboxed.ObjectReference used on opensource projects

Example 36 with ObjectReference

use of org.vmmagic.unboxed.ObjectReference in project JikesRVM by JikesRVM.

the class ScanThread method checkReference.

/**
 * Check that a reference encountered during scanning is valid.  If
 * the reference is invalid, dump stack and die.
 *
 * @param refaddr The address of the reference in question.
 * @param verbosity The level of verbosity to be used when
 * performing the scan.
 */
private void checkReference(Address refaddr, int verbosity) {
    ObjectReference ref = refaddr.loadObjectReference();
    if (!MemoryManager.validRef(ref)) {
        Log.writeln();
        Log.writeln("Invalid ref reported while scanning stack");
        printMethodHeader();
        Log.write(refaddr);
        Log.write(":");
        Log.flush();
        MemoryManager.dumpRef(ref);
        dumpStackFrame(verbosity);
        Log.writeln();
        Log.writeln("Dumping stack starting at frame with bad ref:");
        RVMThread.dumpStack(ip, fp);
        /* dump stack starting at top */
        Address top_ip = thread.getContextRegisters().getInnermostInstructionAddress();
        Address top_fp = thread.getContextRegisters().getInnermostFramePointer();
        RVMThread.dumpStack(top_ip, top_fp);
        Log.writeln("Failing iterators:");
        Offset offset = compiledMethod.getInstructionOffset(ip);
        iterator = iteratorGroup.selectIterator(compiledMethod);
        iterator.setupIterator(compiledMethod, offset, fp);
        int i = 0;
        for (Address addr = iterator.getNextReferenceAddress(); !addr.isZero(); addr = iterator.getNextReferenceAddress()) {
            ObjectReference ref2 = addr.loadObjectReference();
            Log.write("Iterator ");
            Log.write(i++);
            Log.write(": ");
            Log.write(addr);
            Log.write(": ");
            Log.flush();
            MemoryManager.dumpRef(ref2);
        }
        VM.sysFail("\n\nScanStack: Detected bad GC map; exiting RVM with fatal error");
    }
}

Example 37 with ObjectReference

use of org.vmmagic.unboxed.ObjectReference in project JikesRVM by JikesRVM.

the class ScanThread method getHWExceptionRegisters.

/**
 * When an exception occurs, registers are saved temporarily.  If
 * the stack being scanned is in this state, we need to scan those
 * registers for code pointers.  If the codeLocations deque is null,
 * then scanning for code pointers is not required, so we don't need
 * to do anything. (SB: Why only code pointers?).
 * <p>
 * Dave G:  The contents of the GPRs of the exceptionRegisters
 * are handled during normal stack scanning
 * (@see org.jikesrvm.runtime.compilers.common.HardwareTrapCompiledMethod.
 * It looks to me like the main goal of this method is to ensure that the
 * method in which the trap happened isn't treated as dead code and collected
 * (if it's been marked as obsolete, we are setting its activeOnStackFlag below).
 */
private void getHWExceptionRegisters() {
    AbstractRegisters exReg = thread.getExceptionRegisters();
    if (processCodeLocations && exReg.getInUse()) {
        Address ip = exReg.getIP();
        CompiledMethod compiledMethod = CompiledMethods.findMethodForInstruction(ip);
        if (VM.VerifyAssertions) {
            VM._assert(compiledMethod != null);
            VM._assert(compiledMethod.containsReturnAddress(ip));
        }
        compiledMethod.setActiveOnStack();
        ObjectReference code = ObjectReference.fromObject(compiledMethod.getEntryCodeArray());
        Address ipLoc = exReg.getIPLocation();
        if (VM.VerifyAssertions)
            VM._assert(ip.EQ(ipLoc.loadAddress()));
        processCodeLocation(code, ipLoc);
    }
}

Example 38 with ObjectReference

use of org.vmmagic.unboxed.ObjectReference in project JikesRVM by JikesRVM.

the class Mutator method alloc.

/**
 * Allocate an object and return a reference to it.
 *
 * @param refCount The number of reference fields.
 * @param dataCount The number of data fields.
 * @param doubleAlign Is this an 8 byte aligned object?
 * @param allocSite Allocation site
 * @return The object reference.
 */
public ObjectReference alloc(int refCount, int dataCount, boolean doubleAlign, int allocSite) {
    if (!(refCount >= 0))
        fail("Non-negative reference field count required");
    if (!(refCount <= ObjectModel.MAX_REF_FIELDS))
        fail(("Maximum of " + ObjectModel.MAX_REF_FIELDS + " reference fields per object"));
    if (!(dataCount >= 0))
        fail("Non-negative data field count required");
    if (!(dataCount <= ObjectModel.MAX_DATA_FIELDS))
        fail(("Maximum of " + ObjectModel.MAX_DATA_FIELDS + " data fields per object"));
    ObjectReference result = ObjectModel.allocateObject(context, refCount, dataCount, doubleAlign, allocSite);
    if (Trace.isEnabled(Item.ALLOC) || ObjectModel.isWatched(result)) {
        Clock.stop();
        Trace.printf(Item.ALLOC, "alloc(%d,%d,%b) -> [%s]%n", refCount, dataCount, doubleAlign, ObjectModel.getString(result));
        Clock.start();
    }
    if (result == null || result.isNull())
        fail("Allocation returned null");
    return result;
}

Example 39 with ObjectReference

use of org.vmmagic.unboxed.ObjectReference in project JikesRVM by JikesRVM.

the class FinalizableProcessor method forward.

/**
 * {@inheritDoc}.
 * <p>
 * Currently ignores the nursery hint.
 * <p>
 * TODO parallelise this code?
 *
 * @param trace The trace
 * @param nursery Is this a nursery collection ?
 */
@Override
public void forward(TraceLocal trace, boolean nursery) {
    for (int i = 0; i < maxIndex; i++) {
        ObjectReference ref = table.get(i).toObjectReference();
        table.set(i, trace.getForwardedFinalizable(ref).toAddress());
    }
}

Example 40 with ObjectReference

use of org.vmmagic.unboxed.ObjectReference in project JikesRVM by JikesRVM.

the class AllocUserOp method exec.

@Override
public void exec(Env env) {
    StackFrame frame = env.top();
    ObjectReference object;
    try {
        object = env.alloc(refCount, dataCount, getDoubleAlign(frame), site);
    } catch (OutOfMemory e) {
        throw e;
    } catch (Exception e) {
        throw new RuntimeException("Error allocating object id:" + ObjectModel.lastObjectId() + " refs:" + refCount + " ints: " + dataCount + " align:" + getDoubleAlign(frame) + " site:" + site, e);
    }
    setResult(frame, new ObjectValue(object));
    if (Harness.gcEveryAlloc()) {
        env.gc();
    }
}