Examples of org.vmmagic.unboxed.ObjectReference

org.vmmagic.unboxed.ObjectReference
The object reference type is used by the runtime system and collector to represent a type that holds a reference to a single object. We use a separate type instead of the Java Object type for coding clarity, to make a clear distinction between objects the VM is written in, and objects that the VM is managing. No operations that can not be completed in pure Java should be allowed on Object.

JNode specific notes : This class contains some "magic" methods that are interpreted by the VM itself, instead of being executed as normal java methods. The actual method bodies are never used. See {@link org.jnode.vm.classmgr.VmType VmType} to get the list of "magic" classesand see {@link org.jnode.vm.compiler.BaseMagicHelper.MagicMethod MagicMethod}to get the list of "magic" methods @author Daniel Frampton

        size += this.headerSize;
        final Address ptr = alloc(size, align, this.headerSize, allocator);


        // Initialize the header
        final Address objPtr = ptr.add(headerSize);
        final ObjectReference tibRef = ObjectReference.fromObject(vmClass
                .getTIB());
        objPtr.store(tibRef, tibOffset);
        objPtr.store((int) 0, flagsOffset);


        // Post allocation

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            // We already own this lock, increment the lock count.
            lockCount = lockCount.add(Word.one());
        } else {
            final Address ownerAddr = ObjectReference.fromObject(this)
                .toAddress();
            final ObjectReference procRef = ObjectReference.fromObject(VmMagic
                .currentProcessor());
            while (!ownerAddr.attempt(null, procRef)) {
                // Busy wait
            }
            // Now I'm the owner

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        println("getSelector point A");
        if (obj == null)
            return -1;


        println("getSelector point B");
        ObjectReference objRef = ObjectReference.fromObject(obj);


        println("getSelector point C");
        return (objRef == null) ? null : getSelector(objRef.toAddress());
    }

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    }


    @Inline
    private final void verifyChild(Object child, Object parent, String where) {
        if (child != null) {
            final ObjectReference childRef = ObjectReference.fromObject(child);
            if (!heapManager.isObject(childRef.toAddress())) {
                Unsafe.debug("GCVerifyError: in ");
                Unsafe.debug(where);
                Unsafe.debug(", parent type ");
                Unsafe.debug(VmMagic.getObjectType(parent).getName());
                Unsafe.debug(VmMagic.getObjectColor(parent));
                Unsafe.debug("; child (");
                Unsafe.debug(childRef.toAddress().toInt());
                Unsafe.debug(") is not an object ");
                Unsafe.debug(VmMagic.getObjectColor(childRef));
                errorCount++;
            }
        }

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            if ((offset < 0) || (offset >= size)) {
                Unsafe.debug("reference offset out of range!");
                Unsafe.debug(vmClass.getName());
                helper.die("Class internal error");
            } else {
                final ObjectReference child = objAddr.loadObjectReference(Offset.fromIntZeroExtend(offset));
                if (child != null) {
                    // Enable the following in the case of heap corruption
                    if (false) {
                        verifyChild(child, object, "object child", i, offset);
                    }

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    }


    @Inline
    private final void verifyChild(Object child, Object parent, String where, int i, int offset) {
        if (child != null) {
            final ObjectReference childRef = ObjectReference.fromObject(child);
            if (!heapManager.isObject(childRef.toAddress())) {
                Unsafe.debug("GCMarkError: in ");
                Unsafe.debug(where);
                Unsafe.debug(", i ");
                Unsafe.debug(i);
                Unsafe.debug(", offset ");
                Unsafe.debug(offset);
                Unsafe.debug(", parent type ");
                Unsafe.debug(VmMagic.getObjectType(parent).getName());
                Unsafe.debug(VmMagic.getObjectColor(parent));
                Unsafe.debug("; child (");
                Unsafe.debug(childRef.toAddress().toInt());
                Unsafe.debug(") is not an object ");
                Unsafe.debug(VmMagic.getObjectColor(childRef));
                helper.die("Corrupted heap");
            }
        }

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Related Classes of org.vmmagic.unboxed.ObjectReference

org.jnode.driver.video.vesa.VESACommand

org.jnode.vm.memmgr.def.GCMarkVisitor

org.jnode.vm.memmgr.def.GCVerifyVisitor

org.jnode.vm.memmgr.mmtk.BaseMmtkHeapManager

org.jnode.vm.scheduler.ProcessorLock

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