HCIUnit get(HClass hc) {
HCIUnit hciu;
HClass superclass;
HCIUnit superclassInfo;
hciu = (HCIUnit) m_table.get(hc);
if (hciu == null) {
if (hc.isArray()) { // Treat arrays differently
int dims = HClassUtil.dims(hc);
HClass baseclass = HClassUtil.baseClass(hc);
// hc is not primitive, so hc.getLinker() is safe.
superclass =
baseclass.isPrimitive()
? hc.getLinker().forName("java.lang.Object")
: (baseclass.getDescriptor().equals("Ljava/lang/Object;")
? (HClassUtil.arrayClass(hc.getLinker(), baseclass, dims - 1))
: HClassUtil.arrayClass(hc.getLinker(), baseclass.getSuperclass(), dims));
} else {
superclass = hc.getSuperclass();
}
if (superclass != null) {
superclassInfo = get(superclass);
hciu = new HCIUnit(hc, superclassInfo);
} else {
hciu = new HCIUnit(hc);
}
m_table.put(hc, hciu);
}
return hciu;
}
/**
* create a new objectref with default field values.
*
* @exception InterpretedThrowable if class initializer throws an exception.
*/
ObjectRef(StaticState ss, HClass type) {
super(ss, type);
this.fields = null;
this.closure = null;
// Initialize our fields.
for (HClass sc = type; sc != null; sc = sc.getSuperclass()) {
HField[] fl = sc.getDeclaredFields();
for (int i = 0; i < fl.length; i++) if (!fl[i].isStatic()) update(fl[i], defaultValue(fl[i]));
}
// yay, done.
}
private void extend(HClass hc) {
HField[] hFields = hc.getDeclaredFields();
for (int i = 0; i < hFields.length; i++) {
if (hFields[i].isStatic())
m_currentStaticFieldOffset = m_memberMap.map(hFields[i], m_currentStaticFieldOffset);
else m_currentFieldOffset = m_memberMap.map(hFields[i], m_currentFieldOffset);
}
HMethod[] hMethods = hc.getDeclaredMethods();
for (int i = 0; i < hMethods.length; i++) {
m_currentMethodOffset = m_memberMap.map(hMethods[i], m_currentMethodOffset);
}
}
/** Find fields which are *not* subclass-final. */
private Set findBadFields(HCodeFactory hcf, ClassHierarchy ch) {
Set badFields = new HashSet();
// for each callable method...
for (Iterator it = ch.callableMethods().iterator(); it.hasNext(); ) {
HMethod hm = (HMethod) it.next();
HCode hc = hcf.convert(hm);
if (hc == null) continue; // xxx: native methods may write fields!
// construct a must-param oracle for constructors.
MustParamOracle mpo = isConstructor(hm) ? new MustParamOracle(hc) : null;
// examine this method for writes
HClass thisClass = hc.getMethod().getDeclaringClass();
for (Iterator it2 = hc.getElementsI(); it2.hasNext(); ) {
Quad q = (Quad) it2.next();
if (q instanceof SET) {
SET qq = (SET) q;
// ignore writes of static fields.
if (qq.isStatic()) continue;
// if this is a constructor, than it may write only
// to fields of 'this'
if (isConstructor(hm)
&& mpo.isMustParam(qq.objectref())
&& mpo.whichMustParam(qq.objectref()) == 0) continue; // this is a permitted write.
// writes by subclass methods to superclass fields are
// okay. (but not writes by 'this' methods to 'this'
// fields, unless the method is a constructor)
if (qq.field().getDeclaringClass().isInstanceOf(thisClass)
&&
// XXX i think the presence of the 'isConstructor'
// clause here is a bug. constructor writes
// should be taken care of by clause above.
(isConstructor(hm) || !thisClass.equals(qq.field().getDeclaringClass())))
continue; // subclass writes are permitted.
// non-permitted write!
badFields.add(qq.field());
}
}
// on to the next!
}
// done! we have set of all bad (not subclass-final) fields.
return Collections.unmodifiableSet(badFields);
}
static final Object defaultValue(HClass ty) {
if (!ty.isPrimitive()) return null;
if (ty == HClass.Boolean) return new Boolean(false);
if (ty == HClass.Byte) return new Byte((byte) 0);
if (ty == HClass.Char) return new Character((char) 0);
if (ty == HClass.Double) return new Double(0);
if (ty == HClass.Float) return new Float(0);
if (ty == HClass.Int) return new Integer(0);
if (ty == HClass.Long) return new Long(0);
if (ty == HClass.Short) return new Short((short) 0);
throw new Error("Ack! What kinda default value is this?!");
}
// make a wrapped 'zero' value of the specified type.
private Object makeZero(HClass hc) {
if (!hc.isPrimitive()) return null;
if (hc == HClass.Boolean
|| hc == HClass.Byte
|| hc == HClass.Short
|| hc == HClass.Char
|| hc == HClass.Int) return new Integer(0);
if (hc == HClass.Long) return new Long(0);
if (hc == HClass.Float) return new Float(0);
if (hc == HClass.Double) return new Double(0);
assert false : ("unknown type: " + hc);
return null;
}