Examples with JavaClass com.ibm.dtfj.java.JavaClass used on opensource projects

Example 56 with JavaClass

use of com.ibm.dtfj.java.JavaClass in project openj9 by eclipse.

the class PHDJavaRuntime method initClassCache.

private void initClassCache() {
    for (PHDJavaClassLoader ldr : loaders.values()) {
        for (Iterator<JavaClass> it = ldr.getDefinedClasses(); it.hasNext(); ) {
            JavaClass cls = it.next();
            ImagePointer ip = cls.getID();
            if (ip != null) {
                classIdCache.put(ip.getAddress(), cls);
            } else {
                // Some classes have pseudo ids
                for (long l = 1; l <= lastDummyClassAddr(); ++l) {
                    if (cls.equals(ldr.findClass(l))) {
                        classIdCache.put(l, cls);
                    }
                }
            }
        }
    }
}

Example 57 with JavaClass

use of com.ibm.dtfj.java.JavaClass in project openj9 by eclipse.

the class PHDJavaRuntime method getObjectAtAddress.

public JavaObject getObjectAtAddress(ImagePointer address) throws CorruptDataException, IllegalArgumentException, MemoryAccessException, DataUnavailable {
    // Is it a class object?
    final long addr = address.getAddress();
    JavaClass cls = findClass(addr);
    JavaObject jo;
    if (cls != null) {
        jo = cls.getObject();
        if (jo != null && address.equals(jo.getID()))
            return jo;
    }
    if ((jo = extraObjectsCache.get(addr)) != null) {
        return jo;
    } else {
        // See if we already have this object
        for (PHDJavaHeap heap : heaps) {
            try {
                jo = heap.getCachedObjectAtAddress(address, false);
            } catch (IOException e) {
                throw new DataUnavailable("The requested object could not be read from the PHD file");
            }
            if (jo != null)
                return jo;
        }
        // Return a place holder object, may return corrupt data later
        jo = new PHDJavaObject.Builder(heaps.get(0), addr, null, PHDJavaObject.NO_HASHCODE, -1).build();
    }
    return jo;
}

Example 58 with JavaClass

use of com.ibm.dtfj.java.JavaClass in project openj9 by eclipse.

the class HeapdumpCommand method getClassReferences.

/* Reference code reimplemented (rather than using the DTFJ getReferences() API)
	 * because we are trying to match the behaviour of the runtime heapdump rather than
	 * the GC spec. The set of references we're trying to create is different.
	 */
/**
 * Gets the references for the supplied class
 *
 * @param thisJavaClass Class being examined
 */
private ReferenceIterator getClassReferences(JavaClass thisJavaClass) {
    List references = new LinkedList();
    try {
        // Class object instance references
        addReferences(thisJavaClass.getObject(), references);
        // Statics
        addStaticReferences(thisJavaClass, references);
        addProtectionDomainReference(thisJavaClass, references);
        // Constant pool class references
        Iterator constantPoolIt = thisJavaClass.getConstantPoolReferences();
        while (constantPoolIt.hasNext()) {
            Object cpObject = constantPoolIt.next();
            if (cpObject instanceof JavaClass) {
                // Found a class reference, add it to the list
                JavaClass cpJavaClass = (JavaClass) cpObject;
                references.add(new Long(cpJavaClass.getObject().getID().getAddress()));
            }
        }
        // Superclass references
        JavaClass superClass = thisJavaClass.getSuperclass();
        while (null != superClass) {
            references.add(new Long(superClass.getObject().getID().getAddress()));
            superClass = superClass.getSuperclass();
        }
        // Classloader
        JavaClassLoader loader = thisJavaClass.getClassLoader();
        if (loader != null) {
            JavaObject loaderObject = loader.getObject();
            if (loaderObject != null) {
                references.add(new Long(loaderObject.getID().getAddress()));
            } else {
                reportError("Null loader object returned for class: " + thisJavaClass.getName() + "(" + thisJavaClass.getID() + ")", null);
                _numberOfErrors++;
            }
        } else {
            reportError("Null classloader returned for class: " + thisJavaClass.getName() + "(" + thisJavaClass.getID() + ")", null);
            _numberOfErrors++;
        }
    } catch (DTFJException ex) {
        reportError(null, ex);
        _numberOfErrors++;
    }
    return new LongListReferenceIterator(references);
}

Example 59 with JavaClass

use of com.ibm.dtfj.java.JavaClass in project openj9 by eclipse.

the class HeapdumpCommand method dumpClasses.

/**
 * Walks the runtime classes and passes them through the formatter interface
 */
private void dumpClasses(HeapDumpFormatter formatter, JavaRuntime runtime) throws IOException {
    Iterator classLoaderIt = runtime.getJavaClassLoaders();
    int numberOfClasses = 0;
    ITERATING_LOADERS: while (classLoaderIt.hasNext()) {
        Object potential = classLoaderIt.next();
        if (potential instanceof CorruptData) {
            _numberOfErrors++;
            reportError("CorruptData found in classloader list at address: " + ((CorruptData) potential).getAddress(), null);
            continue ITERATING_LOADERS;
        }
        JavaClassLoader thisClassLoader = (JavaClassLoader) potential;
        Iterator classesIt = thisClassLoader.getDefinedClasses();
        ITERATING_CLASSES: while (classesIt.hasNext()) {
            potential = classesIt.next();
            numberOfClasses++;
            try {
                if (potential instanceof CorruptData) {
                    _numberOfErrors++;
                    reportError("CorruptData found in class list for classloader " + Long.toHexString(thisClassLoader.getObject().getID().getAddress()) + " at address: " + ((CorruptData) potential).getAddress(), null);
                    continue ITERATING_CLASSES;
                }
                JavaClass thisJavaClass = (JavaClass) potential;
                JavaClass superClass = thisJavaClass.getSuperclass();
                JavaObject classObject = thisJavaClass.getObject();
                long instanceSize;
                if (thisJavaClass.isArray()) {
                    instanceSize = 0;
                } else {
                    instanceSize = thisJavaClass.getInstanceSize();
                }
                int hashcode = 0;
                if (_is32BitHash) {
                    // JVMs from 2.6 on, optional 32-bit hashcodes, if object was hashed
                    try {
                        hashcode = classObject != null ? (int) classObject.getPersistentHashcode() : 0;
                    } catch (DataUnavailable ex) {
                    // no persistent hashcode for this object, pass hashcode=0 to the heapdump formatter
                    }
                } else {
                    // JVMs prior to 2.6, all objects should have a 16-bit hashcode
                    hashcode = classObject != null ? (int) classObject.getHashcode() : 0;
                }
                formatter.addClass(classObject.getID().getAddress(), thisJavaClass.getName(), superClass != null ? superClass.getID().getAddress() : 0, classObject != null ? (int) classObject.getSize() : 0, instanceSize, hashcode, getClassReferences(thisJavaClass));
            } catch (DTFJException ex) {
                // Handle CorruptDataException and DataUnavailableException the same way
                _numberOfErrors++;
                reportError(null, ex);
                continue ITERATING_CLASSES;
            }
        }
    }
    _numberOfClasses = numberOfClasses;
    if ((pdSkipCount > 0) && _verbose) {
        out.println("Warning : The protection domain information was not available for " + pdSkipCount + " classes");
    }
}

Example 60 with JavaClass

use of com.ibm.dtfj.java.JavaClass in project openj9 by eclipse.

the class HeapdumpCommand method addReferences.

/**
 * Extracts the instance references from an object
 * @param object Object being walked
 * @param references List<Long> to add references to
 * @param thisClass Class of object
 */
private void addReferences(JavaObject object, List<Long> references) throws CorruptDataException, MemoryAccessException {
    Iterator it = object.getReferences();
    Object ref = null;
    // discard the first reference which is always to the class
    if (it.hasNext()) {
        // test hasNext() to be on the safe side.
        ref = it.next();
    }
    while (it.hasNext()) {
        ref = it.next();
        if (ref instanceof CorruptData) {
            // can sometimes get a nasty surprise in the list - e.g. a J9DDRCorruptData
            _numberOfErrors++;
            reportError("Corrupt data found at address " + ((CorruptData) ref).getAddress() + " getting references from object at address: " + Long.toHexString(object.getID().getAddress()) + " of class " + object.getJavaClass().getName() + "(" + object.getJavaClass().getID() + ")", null);
            continue;
        }
        if (!(ref instanceof JavaReference)) {
            _numberOfErrors++;
            reportError("Object of unexpected type " + ref.getClass() + " found within references from object at address: " + object.getID().getAddress() + " of class " + object.getJavaClass().getName() + "(" + object.getJavaClass().getID() + ")", null);
            continue;
        } else {
            Object target;
            try {
                target = ((JavaReference) ref).getTarget();
            } catch (DataUnavailable e) {
                _numberOfErrors++;
                reportError("DataUnavailable thrown from call to getTarget() on reference: " + ref, null);
                continue;
            }
            // the following ugliness is necessary as JavaObject and JavaClass both support getID() but do not inherit from a common parent
            if (target instanceof JavaObject) {
                references.add(new Long(((JavaObject) target).getID().getAddress()));
            } else if (target instanceof JavaClass) {
                references.add(new Long(((JavaClass) target).getID().getAddress()));
            } else {
                _numberOfErrors++;
                reportError("Object of unexpected type " + target.getClass() + " returned from call to getTarget() on reference " + ref, null);
            }
        }
    }
}