/**
* 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);
}
}
}
}
/**
* Read the fields table
*
* @param cls
* @param fieldDatas
* @param sharedStatics
* @param isolatedStatics
* @param slotSize
* @param pragmaFlags
*/
private static void createFields(
VmType<?> cls,
FieldData[] fieldDatas,
VmSharedStatics sharedStatics,
VmIsolatedStatics isolatedStatics,
int slotSize,
int pragmaFlags) {
final int fcount = fieldDatas.length;
final VmField[] ftable = new VmField[fcount];
int objectSize = 0;
for (int i = 0; i < fcount; i++) {
final FieldData fd = fieldDatas[i];
final boolean wide;
int modifiers = fd.modifiers;
final String name = fd.name;
final String signature = fd.signature;
switch (signature.charAt(0)) {
case 'J':
case 'D':
modifiers = modifiers | Modifier.ACC_WIDE;
wide = true;
break;
default:
wide = false;
}
final boolean isstatic = (modifiers & Modifier.ACC_STATIC) != 0;
final int staticsIdx;
final VmField fs;
final VmStatics statics;
if (isstatic) {
// Determine if the static field should be shared.
final boolean shared = cls.isSharedStatics();
if (shared) {
statics = sharedStatics;
} else {
statics = isolatedStatics;
}
// If static allocate space for it.
switch (signature.charAt(0)) {
case 'B':
staticsIdx = statics.allocIntField();
break;
case 'C':
staticsIdx = statics.allocIntField();
break;
case 'D':
staticsIdx = statics.allocLongField();
break;
case 'F':
staticsIdx = statics.allocIntField();
break;
case 'I':
staticsIdx = statics.allocIntField();
break;
case 'J':
staticsIdx = statics.allocLongField();
break;
case 'S':
staticsIdx = statics.allocIntField();
break;
case 'Z':
staticsIdx = statics.allocIntField();
break;
default:
{
if (Modifier.isAddressType(signature)) {
staticsIdx = statics.allocAddressField();
} else {
staticsIdx = statics.allocObjectField();
// System.out.println(NumberUtils.hex(staticsIdx)
// + "\t" + cls.getName() + "." + name);
}
break;
}
}
fs = new VmStaticField(name, signature, modifiers, staticsIdx, cls, slotSize, shared);
} else {
staticsIdx = -1;
statics = null;
final int fieldOffset;
// Set the offset (keep in mind that this will be fixed
// by ClassResolver with respect to the objectsize of the
// super-class.
fieldOffset = objectSize;
// Increment the objectSize
if (wide) objectSize += 8;
else if (Modifier.isPrimitive(signature)) {
objectSize += 4;
} else {
objectSize += slotSize;
}
fs = new VmInstanceField(name, signature, modifiers, fieldOffset, cls, slotSize);
}
ftable[i] = fs;
// Read field attributes
if (isstatic && (fd.constantValue != null)) {
switch (signature.charAt(0)) {
case 'B':
case 'C':
case 'I':
case 'S':
case 'Z':
statics.setInt(staticsIdx, ((VmConstInt) fd.constantValue).intValue());
break;
case 'D':
final long lval =
Double.doubleToRawLongBits(((VmConstDouble) fd.constantValue).doubleValue());
statics.setLong(staticsIdx, lval);
break;
case 'F':
final int ival =
Float.floatToRawIntBits(((VmConstFloat) fd.constantValue).floatValue());
statics.setInt(staticsIdx, ival);
break;
case 'J':
statics.setLong(staticsIdx, ((VmConstLong) fd.constantValue).longValue());
break;
default:
// throw new IllegalArgumentException("signature "
// + signature);
statics.setObject(staticsIdx, fd.constantValue);
break;
}
}
fs.setRuntimeAnnotations(fd.rVisAnn);
fs.setRawAnnotations(fd.rawAnnotations);
}
// Align the instance fields for minimal object size.
if ((pragmaFlags & TypePragmaFlags.NO_FIELD_ALIGNMENT) == 0) {
objectSize = alignInstanceFields(ftable, slotSize);
}
cls.setFieldTable(ftable);
if (objectSize > 0) {
((VmNormalClass<?>) cls).setObjectSize(objectSize);
}
}
