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

Example 16 with JavaClass

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

the class Utils method getStringVal.

private static String getStringVal(JavaObject jo) {
    JavaClass jc;
    try {
        jc = jo.getJavaClass();
    } catch (CorruptDataException e) {
        return "<cannot get String class from String object (" + Exceptions.getCorruptDataExceptionString() + ")>";
    }
    Iterator itJavaField = jc.getDeclaredFields();
    JavaField jf = null;
    while (itJavaField.hasNext()) {
        jf = (JavaField) itJavaField.next();
        try {
            if (jf.getSignature().equals("[C") && !Modifier.isStatic(jf.getModifiers()))
                break;
        } catch (CorruptDataException e) {
        // if we have an exception, do nothing and go onto the next field
        }
    }
    if (jf == null) {
        // empty field iterator (occurs e.g. when reading PHD heapdumps), can't get the char array
        return "<cannot get char array out of String>";
    }
    JavaObject charArray = null;
    try {
        charArray = (JavaObject) jf.get(jo);
    } catch (CorruptDataException e) {
        return "<cannot get char array out of String (" + Exceptions.getCorruptDataExceptionString() + ")>";
    } catch (MemoryAccessException e) {
        return "<cannot get char array out of String (" + Exceptions.getMemoryAccessExceptionString() + ")>";
    }
    int arraySize;
    try {
        arraySize = charArray.getArraySize();
    } catch (CorruptDataException e) {
        return "<cannot determine the size of the array (" + Exceptions.getCorruptDataExceptionString() + ")>";
    }
    char[] dst = new char[arraySize];
    try {
        charArray.arraycopy(0, dst, 0, arraySize);
    } catch (CorruptDataException e) {
        return "<cannot copy data from the array (" + Exceptions.getCorruptDataExceptionString() + ")>";
    } catch (MemoryAccessException e) {
        return "<cannot copy data from the array (" + Exceptions.getMemoryAccessExceptionString() + ")>";
    }
    return "\"" + Utils.getPrintable(new String(dst)) + "\"";
}

Example 17 with JavaClass

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

the class InfoClassCommand method printClassDetails.

private void printClassDetails(JavaRuntime jr, String className, JavaClass jc) {
    String spaces = "    ";
    String cdeInfo = "N/A (CorruptDataException occurred)";
    try {
        out.print("name = " + jc.getName());
    } catch (CorruptDataException dce) {
        out.print("name = " + cdeInfo);
    }
    out.print("\n\n\t");
    out.print("ID = " + Utils.toHex(jc.getID()));
    String superClassId;
    try {
        JavaClass superClass = jc.getSuperclass();
        if (null == superClass) {
            superClassId = "<no superclass>";
        } else {
            superClassId = Utils.toHex(superClass.getID());
        }
    } catch (CorruptDataException dce) {
        superClassId = cdeInfo;
    }
    out.print(spaces);
    out.print("superID = " + superClassId);
    // Omitting size of class because that might differ between instances (i.e. arrays)
    String classLoaderId;
    try {
        JavaClassLoader jClassLoader = jc.getClassLoader();
        JavaObject jo = jClassLoader.getObject();
        if (jo != null) {
            classLoaderId = Utils.toHex(jo.getID());
        } else {
            classLoaderId = "<data unavailable>";
        }
    } catch (CorruptDataException cde) {
        classLoaderId = cdeInfo;
    }
    out.print(spaces);
    out.print("\n\t");
    out.print("classLoader = " + classLoaderId);
    String modifiersInfo;
    try {
        modifiersInfo = Utils.getClassModifierString(jc);
    } catch (CorruptDataException cde) {
        modifiersInfo = cdeInfo;
    }
    out.print(spaces);
    out.print("modifiers: " + modifiersInfo);
    out.print("\n\n");
    ClassStatistics d = getClassStatisticsFor(jr, jc);
    out.print("\tnumber of instances:     " + d.getCount() + "\n");
    out.print("\ttotal size of instances on the heap: " + d.getSize() + " bytes");
    out.print("\n\n");
    printClassHierarchy(jc);
    out.print("\n");
    printFields(jc);
    out.print("\n");
    printMethods(jc);
}

Example 18 with JavaClass

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

the class InfoClassCommand method countClassInstances.

private void countClassInstances() {
    JavaRuntime runtime = ctx.getRuntime();
    Map<JavaClass, ClassStatistics> thisRuntimeClasses = classInstanceCounts.get(runtime);
    final Collection<JavaClass> javaClasses = getRuntimeClasses(runtime);
    long corruptObjectCount = 0;
    long corruptClassCount = 0;
    long corruptClassNameCount = 0;
    Iterator itHeap = runtime.getHeaps();
    while (itHeap.hasNext()) {
        Object heap = itHeap.next();
        if (heap instanceof CorruptData) {
            out.println("[skipping corrupt heap]");
            continue;
        }
        JavaHeap jh = (JavaHeap) heap;
        Iterator itObject = jh.getObjects();
        // Walk through all objects in this heap, accumulating counts and total memory size by class
        while (itObject.hasNext()) {
            Object next = itObject.next();
            // JavaHeap, we don't attempt to count these as instances of known classes).
            if (next instanceof JavaObject) {
                JavaObject jo = (JavaObject) next;
                ClassStatistics stats = null;
                try {
                    // Check whether we found this class in the classloaders walk earlier
                    JavaClass jc = jo.getJavaClass();
                    if (javaClasses.contains(jc)) {
                        stats = thisRuntimeClasses.get(jc);
                    } else {
                        // Class not found in the classloaders, create a statistic for it now, and issue a warning message
                        stats = new ClassStatistics();
                        thisRuntimeClasses.put(jc, stats);
                        String classname;
                        try {
                            classname = jc.getName();
                            out.println("Warning, class: " + classname + " found when walking the heap was missing from classloader walk");
                        } catch (CorruptDataException cde) {
                            corruptClassNameCount++;
                        }
                    }
                    // Increment the statistic for objects of this class (accumulated count and size)
                    stats.incrementCount();
                    try {
                        stats.addToSize(jo.getSize());
                    } catch (CorruptDataException cde) {
                        // bad size, count object as corrupt
                        corruptObjectCount++;
                    }
                } catch (CorruptDataException cde) {
                    corruptClassCount++;
                }
            } else {
                corruptObjectCount++;
            }
        }
    }
    if (corruptObjectCount != 0) {
        out.println("Warning, found " + corruptObjectCount + " corrupt objects during heap walk");
    }
    if (corruptClassCount != 0) {
        out.println("Warning, found " + corruptClassCount + " corrupt class references during heap walk");
    }
    if (corruptClassNameCount != 0) {
        out.println("Warning, found " + corruptClassNameCount + " corrupt class names during heap walk");
    }
}

Example 19 with JavaClass

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

the class JavaThread method getPriority.

/* (non-Javadoc)
	 * @see com.ibm.dtfj.java.JavaThread#getPriority()
	 */
public int getPriority() throws CorruptDataException {
    JavaObject theObject = getObject();
    if (null != theObject) {
        JavaClass threadClass = _javaLangThreadSuperclass();
        Iterator fields = threadClass.getDeclaredFields();
        while (fields.hasNext()) {
            JavaField oneField = (JavaField) fields.next();
            if (oneField.getName().equals("priority")) {
                try {
                    return oneField.getInt(theObject);
                } catch (MemoryAccessException e) {
                    throw new CorruptDataException(new CorruptData("unable to read memory for 'priority' field", null));
                }
            }
        }
        throw new CorruptDataException(new CorruptData("unable to find 'priority' field", null));
    } else {
        // TODO:  have a good exception for this sort of thing
        return -1;
    }
}

Example 20 with JavaClass

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

the class PHDJavaRuntime method saveExtraObject.

private void saveExtraObject(final PHDJavaClassLoader boot, JavaObject jo) {
    if (jo != null) {
        long addr = jo.getID().getAddress();
        JavaClass cls;
        try {
            cls = boot.findClassUnique(jo.getJavaClass().getName());
        } catch (CorruptDataException e) {
            cls = null;
        }
        // Construct a dummy object with little information in case the object is not in the heap
        JavaObject jo2 = new PHDJavaObject.Builder(heaps.get(0), addr, cls, PHDJavaObject.NO_HASHCODE, -1).refsAsArray(NOREFS, 0).length(PHDJavaObject.UNKNOWN_TYPE).build();
        extraObjectsCache.put(addr, jo2);
    }
}