/**
* Align the offsets of the fields in the class optimized for minimal object size.
*
* @param fields
* @return The objectsize taken by all the fields
*/
private static final int alignInstanceFields(VmField[] fields, int slotSize) {
int objectSize = 0;
for (byte currentTypeSize : TYPE_SIZES) {
boolean aligned = false;
for (VmField f : fields) {
if (!f.isStatic() && (f.getTypeSize() == currentTypeSize)) {
if (!aligned) {
// Align on the current type size
objectSize = align(objectSize, Math.min(currentTypeSize, slotSize));
aligned = true;
}
final VmInstanceField fld = (VmInstanceField) f;
fld.setOffset(objectSize);
objectSize += currentTypeSize;
}
}
}
// Make sure the object size is 32-bit aligned
return align(objectSize, 4);
}
/** Do the prepare action required to instantiate this object */
protected void prepareForInstantiation() {
// Step 3: Calculate the object size
final VmNormalClass superCls = getSuperClass();
int sc_size = (superCls != null) ? superCls.getObjectSize() : 0;
objectSize += sc_size;
// System.out.println(getName() + " objsz:" + objectSize + " sc_size:" + sc_size);
// Step 4a: Fix the offset for all declared non-static fields
final int cnt = getNoDeclaredFields();
final int[] superRefOffsets = (superCls != null) ? superCls.getReferenceOffsets() : null;
int refOffsetsSize = (superCls != null) ? superRefOffsets.length : 0;
int startRefIdx = refOffsetsSize;
for (int i = 0; i < cnt; i++) {
final VmField field = getDeclaredField(i);
// fs.resolve(loader);
if (!field.isStatic()) {
final VmInstanceField inf = (VmInstanceField) field;
inf.resolveOffset(sc_size);
if (!field.isPrimitive()) {
if (!field.isAddressType()) {
refOffsetsSize++;
} else {
// System.out.println("Found address in field " + fs.getName());
}
}
}
}
// Step 4b: Create the referenceOffsets field
referenceOffsets = new int[refOffsetsSize];
if (superCls != null) {
System.arraycopy(superRefOffsets, 0, referenceOffsets, 0, startRefIdx);
}
for (int i = 0; i < cnt; i++) {
final VmField field = getDeclaredField(i);
if (!field.isStatic()) {
final VmInstanceField inf = (VmInstanceField) field;
if (!field.isPrimitive()) {
if (!field.isAddressType()) {
referenceOffsets[startRefIdx++] = inf.getOffset();
}
}
final int off = inf.getOffset();
if (off + inf.getTypeSize() > objectSize) {
throw new Error(
"Invalid offset in class " + getName() + " ofs " + off + " size " + objectSize);
}
}
}
}
