private static long headerSize(BasicType type) {
if (Universe.elementTypeShouldBeAligned(type)) {
return alignObjectSize(headerSizeInBytes()) / VM.getVM().getHeapWordSize();
} else {
return headerSizeInBytes() / VM.getVM().getHeapWordSize();
}
}
private long lengthOffsetInBytes() {
if (lengthOffsetInBytes != 0) {
return lengthOffsetInBytes;
}
if (VM.getVM().isCompressedOopsEnabled()) {
lengthOffsetInBytes = typeSize - VM.getVM().getIntSize();
} else {
lengthOffsetInBytes = typeSize;
}
return lengthOffsetInBytes;
}
private static long headerSizeInBytes() {
if (headerSize != 0) {
return headerSize;
}
if (VM.getVM().isCompressedOopsEnabled()) {
headerSize = typeSize;
} else {
headerSize =
VM.getVM().alignUp(typeSize + VM.getVM().getIntSize(), VM.getVM().getHeapWordSize());
}
return headerSize;
}
// "size helper" == instance size in words
public long getSizeHelper() {
int lh = getLayoutHelper();
if (Assert.ASSERTS_ENABLED) {
Assert.that(lh > 0, "layout helper initialized for instance class");
}
return lh / VM.getVM().getAddressSize();
}
public void forEachObject(Object[] args) {
boolean subtypes = true;
Klass kls = null;
Callable func = null;
switch (args.length) {
case 3:
{
Object b = args[2];
if (b != null && b instanceof Boolean) {
subtypes = ((Boolean) b).booleanValue();
}
}
case 2:
{
Object k = args[1];
if (k == null) return;
if (k instanceof JSJavaKlass) {
kls = ((JSJavaKlass) k).getKlass();
} else if (k instanceof String) {
kls = SystemDictionaryHelper.findInstanceKlass((String) k);
if (kls == null) return;
}
}
case 1:
{
Object f = args[0];
if (f != null && f instanceof Callable) {
func = (Callable) f;
} else {
// unknown target - just return
return;
}
}
break;
default:
return;
}
final Callable finalFunc = func;
HeapVisitor visitor =
new DefaultHeapVisitor() {
public boolean doObj(Oop oop) {
JSJavaObject jo = factory.newJSJavaObject(oop);
if (jo != null) {
try {
finalFunc.call(new Object[] {jo});
} catch (ScriptException exp) {
throw new RuntimeException(exp);
}
}
return false;
}
};
ObjectHeap heap = VM.getVM().getObjectHeap();
if (kls == null) {
kls = SystemDictionaryHelper.findInstanceKlass("java.lang.Object");
}
heap.iterateObjectsOfKlass(visitor, kls, subtypes);
}
static {
VM.registerVMInitializedObserver(
new Observer() {
public void update(Observable o, Object data) {
initialize(VM.getVM().getTypeDataBase());
}
});
}
private static void initialize(TypeDataBase db) {
Type type = db.lookupType("oopDesc");
if (VM.getVM().isCompressedOopsEnabled()) {
klassField = type.getNarrowOopField("_metadata._compressed_klass");
} else {
klassField = type.getOopField("_metadata._klass");
}
}
/** Convenience routine taking Strings; lookup is done in SymbolTable. */
public Method findMethod(String name, String sig) {
SymbolTable syms = VM.getVM().getSymbolTable();
Symbol nameSym = syms.probe(name);
Symbol sigSym = syms.probe(sig);
if (nameSym == null || sigSym == null) {
return null;
}
return findMethod(nameSym, sigSym);
}
private void iterateOops(
final InstanceKlass ik, final ObjectVisitor visitor, boolean includeSubtypes) {
ObjectHeap oh = VM.getVM().getObjectHeap();
oh.iterateObjectsOfKlass(
new HeapVisitor() {
boolean filterExists;
public void prologue(long usedSize) {
filterExists = getScriptEngine().get("filter") != null;
}
public boolean doObj(Oop obj) {
dispatchObject(obj, visitor, filterExists);
return false;
}
public void epilogue() {}
},
ik,
includeSubtypes);
}
public static boolean oopLooksValid(OopHandle oop) {
if (oop == null) {
return false;
}
if (!VM.getVM().getUniverse().isIn(oop)) {
return false;
}
try {
for (int i = 0; i < 4; ++i) {
OopHandle next = klassField.getValue(oop);
if (next == null) {
return false;
}
if (next.equals(oop)) {
return true;
}
oop = next;
}
return false;
} catch (AddressException e) {
return false;
}
}
// Creates new field from index in fields TypeArray
private Field newField(int index) {
TypeArray fields = getFields();
short signatureIndex = fields.getShortAt(index + SIGNATURE_INDEX_OFFSET);
FieldType type = new FieldType((Symbol) getConstants().getObjAt(signatureIndex));
if (type.isOop()) {
if (VM.getVM().isCompressedOopsEnabled()) {
return new NarrowOopField(this, index);
} else {
return new OopField(this, index);
}
}
if (type.isByte()) {
return new ByteField(this, index);
}
if (type.isChar()) {
return new CharField(this, index);
}
if (type.isDouble()) {
return new DoubleField(this, index);
}
if (type.isFloat()) {
return new FloatField(this, index);
}
if (type.isInt()) {
return new IntField(this, index);
}
if (type.isLong()) {
return new LongField(this, index);
}
if (type.isShort()) {
return new ShortField(this, index);
}
if (type.isBoolean()) {
return new BooleanField(this, index);
}
throw new RuntimeException("Illegal field type at index " + index);
}
private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
Type type = db.lookupType("methodOopDesc");
constMethod = new OopField(type.getOopField("_constMethod"), 0);
constants = new OopField(type.getOopField("_constants"), 0);
methodSize = new CIntField(type.getCIntegerField("_method_size"), 0);
maxStack = new CIntField(type.getCIntegerField("_max_stack"), 0);
maxLocals = new CIntField(type.getCIntegerField("_max_locals"), 0);
sizeOfParameters = new CIntField(type.getCIntegerField("_size_of_parameters"), 0);
accessFlags = new CIntField(type.getCIntegerField("_access_flags"), 0);
code = type.getAddressField("_code");
vtableIndex = new CIntField(type.getCIntegerField("_vtable_index"), 0);
if (!VM.getVM().isCore()) {
invocationCounter = new CIntField(type.getCIntegerField("_invocation_counter"), 0);
}
bytecodeOffset = type.getSize();
/*
interpreterEntry = type.getAddressField("_interpreter_entry");
fromCompiledCodeEntryPoint = type.getAddressField("_from_compiled_code_entry_point");
*/
objectInitializerName = null;
classInitializerName = null;
}
private static Symbol javaLangCloneableName() {
if (javaLangCloneableName == null) {
javaLangCloneableName = VM.getVM().getSymbolTable().probe("java/lang/Cloneable");
}
return javaLangCloneableName;
}
private long getUsed() {
return VM.getVM().getUniverse().heap().used();
}
private static Symbol objectInitializerName() {
if (objectInitializerName == null) {
objectInitializerName = VM.getVM().getSymbolTable().probe("<init>");
}
return objectInitializerName;
}
// Accessors for declared fields
public long getLength() {
boolean isUnsigned = true;
return this.getHandle()
.getCIntegerAt(lengthOffsetInBytes(), VM.getVM().getIntSize(), isUnsigned);
}
private static Symbol classInitializerName() {
if (classInitializerName == null) {
classInitializerName = VM.getVM().getSymbolTable().probe("<clinit>");
}
return classInitializerName;
}
public long getInvocationCounter() {
if (Assert.ASSERTS_ENABLED) {
Assert.that(!VM.getVM().isCore(), "must not be used in core build");
}
return invocationCounter.getValue(this);
}
public static long baseOffsetInBytes(BasicType type) {
return headerSize(type) * VM.getVM().getHeapWordSize();
}
private long getCapacity() {
return VM.getVM().getUniverse().heap().capacity();
}
private static Symbol javaLangObjectName() {
if (javaLangObjectName == null) {
javaLangObjectName = VM.getVM().getSymbolTable().probe("java/lang/Object");
}
return javaLangObjectName;
}
private static Symbol javaIoSerializableName() {
if (javaIoSerializableName == null) {
javaIoSerializableName = VM.getVM().getSymbolTable().probe("java/io/Serializable");
}
return javaIoSerializableName;
}
/** Runs the analysis algorithm */
public void run() {
if (VM.getVM().getRevPtrs() != null) {
return; // Assume already done
}
VM vm = VM.getVM();
rp = new ReversePtrs();
vm.setRevPtrs(rp);
Universe universe = vm.getUniverse();
CollectedHeap collHeap = universe.heap();
usedSize = collHeap.used();
visitedSize = 0;
// Note that an experiment to iterate the heap linearly rather
// than in recursive-descent order has been done. It turns out
// that the recursive-descent algorithm is nearly twice as fast
// due to the fact that it scans only live objects and (currently)
// only a fraction of the perm gen, namely the static fields
// contained in instanceKlasses. (Iterating the heap linearly
// would also change the semantics of the result so that
// ReversePtrs.get() would return a non-null value even for dead
// objects.) Nonetheless, the reverse pointer computation is still
// quite slow and optimization in field iteration of objects
// should be done.
if (progressThunk != null) {
// Get it started
progressThunk.heapIterationFractionUpdate(0);
}
// Allocate mark bits for heap
markBits = new MarkBits(collHeap);
// Get a hold of the object heap
heap = vm.getObjectHeap();
// Do each thread's roots
for (JavaThread thread = VM.getVM().getThreads().first();
thread != null;
thread = thread.next()) {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
thread.printThreadIDOn(new PrintStream(bos));
String threadDesc =
" in thread \"" + thread.getThreadName() + "\" (id " + bos.toString() + ")";
doStack(thread, new RootVisitor("Stack root" + threadDesc));
doJNIHandleBlock(thread.activeHandles(), new RootVisitor("JNI handle root" + threadDesc));
}
// Do global JNI handles
JNIHandles handles = VM.getVM().getJNIHandles();
doJNIHandleBlock(handles.globalHandles(), new RootVisitor("Global JNI handle root"));
doJNIHandleBlock(handles.weakGlobalHandles(), new RootVisitor("Weak global JNI handle root"));
// Do Java-level static fields
SystemDictionary sysDict = VM.getVM().getSystemDictionary();
sysDict.allClassesDo(
new SystemDictionary.ClassVisitor() {
public void visit(Klass k) {
if (k instanceof InstanceKlass) {
final InstanceKlass ik = (InstanceKlass) k;
ik.iterateStaticFields(
new DefaultOopVisitor() {
public void doOop(OopField field, boolean isVMField) {
Oop next = field.getValue(getObj());
NamedFieldIdentifier nfi =
new NamedFieldIdentifier(
"Static field \""
+ field.getID().getName()
+ "\" in class \""
+ ik.getName().asString()
+ "\"");
LivenessPathElement lp = new LivenessPathElement(null, nfi);
rp.put(lp, next);
try {
markAndTraverse(next);
} catch (AddressException e) {
System.err.print(
"RevPtrs analysis: WARNING: AddressException at 0x"
+ Long.toHexString(e.getAddress())
+ " while traversing static fields of InstanceKlass ");
ik.printValueOn(System.err);
System.err.println();
} catch (UnknownOopException e) {
System.err.println(
"RevPtrs analysis: WARNING: UnknownOopException while "
+ "traversing static fields of InstanceKlass ");
ik.printValueOn(System.err);
System.err.println();
}
}
});
}
}
});
if (progressThunk != null) {
progressThunk.heapIterationComplete();
}
// Clear out markBits
markBits = null;
}
public Klass getJavaSuper() {
SystemDictionary sysDict = VM.getVM().getSystemDictionary();
return sysDict.getObjectKlass();
}
public void forEachClass(Object[] args) {
boolean withLoader = false;
Callable func = null;
switch (args.length) {
case 2:
{
Object b = args[1];
if (b instanceof Boolean) {
withLoader = ((Boolean) b).booleanValue();
}
}
case 1:
{
Object f = args[0];
if (f instanceof Callable) {
func = (Callable) f;
} else {
return;
}
}
break;
default:
return;
}
final Callable finalFunc = func;
SystemDictionary sysDict = VM.getVM().getSystemDictionary();
if (withLoader) {
sysDict.classesDo(
new SystemDictionary.ClassAndLoaderVisitor() {
public void visit(Klass kls, Oop loader) {
JSJavaKlass jk = factory.newJSJavaKlass(kls);
if (jk == null) {
return;
}
JSJavaObject k = jk.getJSJavaClass();
JSJavaObject l = factory.newJSJavaObject(loader);
if (k != null) {
if (k != null) {
try {
finalFunc.call(new Object[] {k, l});
} catch (ScriptException exp) {
throw new RuntimeException(exp);
}
}
}
}
});
} else {
sysDict.classesDo(
new SystemDictionary.ClassVisitor() {
public void visit(Klass kls) {
JSJavaKlass jk = factory.newJSJavaKlass(kls);
if (jk == null) {
return;
}
JSJavaClass k = jk.getJSJavaClass();
if (k != null) {
if (k != null) {
try {
finalFunc.call(new Object[] {k});
} catch (ScriptException exp) {
throw new RuntimeException(exp);
}
}
}
}
});
}
}