class CPGen {
private final Hashtable entries = new Hashtable();
+ private Ent[] entriesByIndex; // only valid when stable
+
private int usedSlots = 1; // 0 is reserved
private int state = OPEN;
private static final int OPEN = 0;
/*
* Entries
*/
- abstract static class Ent {
+ public abstract static class Ent {
+ CPGen owner; // don't need this yet, but we will to implement ref() and unref()
int n; // this is the refcount if state == OPEN, index if >= STABLE
int tag;
- Ent(int tag) { this.tag = tag; }
+ Ent(CPGen owner, int tag) { this.owner = owner; this.tag = tag; }
void dump(DataOutput o) throws IOException { o.writeByte(tag); }
String debugToString() { return toString(); } // so we can remove this method when not debugging
+ abstract Object key() throws ClassGen.ClassReadExn; // be careful using this, it drags in a bunch of code
}
+ // INVARIANTS: tag == 3 || tag == 4
static class IntEnt extends Ent {
int i;
- IntEnt(int tag) { super(tag); }
+ IntEnt(CPGen owner, int tag) { super(owner,tag); }
void dump(DataOutput o) throws IOException { super.dump(o); o.writeInt(i); }
+ Object key() {
+ switch(tag) {
+ case 3: return new Integer(i);
+ case 4: return new Float(Float.intBitsToFloat(i));
+ default: throw new Error("should never happen");
+ }
+ }
}
+ // INVARIANTS: tag == 5 || tag == 6
static class LongEnt extends Ent {
long l;
- LongEnt(int tag) { super(tag); }
+ LongEnt(CPGen owner, int tag) { super(owner,tag); }
void dump(DataOutput o) throws IOException { super.dump(o); o.writeLong(l); }
+ Object key() {
+ switch(tag) {
+ case 5: return new Long(l);
+ case 6: return new Double(Double.longBitsToDouble(l));
+ default: throw new Error("should never happen");
+ }
+ }
}
+ /* INVARIANTS:
+ tag >= 7 && tag <= 12
+ if(tag == 7 || tag == 8) e0 instanceof Utf8Ent
+ if(tag == 9 || tag == 10 || tag == 11) {
+ e0 instanceof CPRefEnt && e0.tag == 7
+ e1 instanceof CPRefEnt && e0.tag == 12
+ }
+ if(tag == 12) {
+ e0 instanceof Utf8Ent
+ }
+ */
static class CPRefEnt extends Ent {
Ent e1;
Ent e2;
- CPRefEnt(int tag) { super(tag); }
+ CPRefEnt(CPGen owner, int tag) { super(owner,tag); }
String debugToString() { return "[" + e1.n + ":" + e1.debugToString() + (e2 == null ? "" : " + " + e2.n + ":" + e2.debugToString()) + "]"; }
void dump(DataOutput o) throws IOException {
super.dump(o);
- if(e1.n == 6 || (e2!=null && e2.n == 6)) System.err.println(debugToString() + " refs 6");
o.writeShort(e1.n);
if(e2 != null) o.writeShort(e2.n);
}
+
+ Object key() throws ClassGen.ClassReadExn {
+ switch(tag) {
+ case 7: return new Type.Object(((Utf8Ent)e0).s);
+ case 8: return (((Utf8Ent)e1).s);
+ case 9:
+ NameAndTypeKey nt = (NameAndTypeKey) e2.key();
+ Type t = Type.fromDescriptor(nt.type);
+ if(t == null) throw new ClassGen.ClassReadExn("invalid type descriptor");
+ return FieldRef((Type.Object)e1.key(), nt.name, t);
+ case 10:
+ NameAndTypeKey nt = (NameAndTypeKey) e2.key();
+ return MethodRef((Type.Object)e1.key(),throw new Error("fixme"));
+ }
+ }
}
static class Utf8Ent extends Ent {
String s;
- Utf8Ent() { super(1); }
+ Utf8Ent(CPGen owner) { super(owner,1); }
String debugToString() { return s; }
void dump(DataOutput o) throws IOException { super.dump(o); o.writeUTF(s); }
}
/*
* Cache Keys
*/
- static class Utf8Key {
+ public static class Utf8Key {
String s;
public Utf8Key(String s) { this.s = s; }
public boolean equals(Object o) { return o instanceof Utf8Key && ((Utf8Key)o).s.equals(s); }
public int hashCode() { return ~s.hashCode(); }
}
- static class NameAndTypeKey {
+ public static class NameAndTypeKey {
String name;
String type;
NameAndTypeKey(String name, String type) { this.name = name; this.type = type; }
if(state < STABLE) throw new IllegalStateException("constant pool is not stable");
return ent.n;
}
+
+ public final Ent getByIndex(int index) {
+ if(state < STABLE) throw new IllegalStateException("constant pool is not stable");
+ Ent e;
+ if(index >= 65536 || index >= entriesByIndex.length || (e = entriesByIndex[index]) == null)
+ throw new IllegalStateException("invalid cp index");
+ return e;
+ }
public final Ent addNameAndType(String name, String descriptor) { return add(new NameAndTypeKey(name,descriptor)); }
public final Ent addUtf8(String s) { return add(new Utf8Key(s)); }
}
if(o instanceof Type.Object) {
- CPRefEnt ce = new CPRefEnt(7);
+ CPRefEnt ce = new CPRefEnt(this,7);
ce.e1 = addUtf8(((Type.Object)o).internalForm());
ent = ce;
} else if(o instanceof String) {
- CPRefEnt ce = new CPRefEnt(8);
+ CPRefEnt ce = new CPRefEnt(this,8);
ce.e1 = addUtf8((String)o);
ent = ce;
} else if(o instanceof Integer) {
- IntEnt ue = new IntEnt(3);
+ IntEnt ue = new IntEnt(this,3);
ue.i = ((Integer)o).intValue();
ent = ue;
} else if(o instanceof Float) {
- IntEnt ue = new IntEnt(4);
+ IntEnt ue = new IntEnt(this,4);
ue.i = Float.floatToIntBits(((Float)o).floatValue());
ent = ue;
} else if(o instanceof Long) {
- LongEnt le = new LongEnt(5);
+ LongEnt le = new LongEnt(this,5);
le.l = ((Long)o).longValue();
ent = le;
} else if(o instanceof Double) {
- LongEnt le = new LongEnt(6);
+ LongEnt le = new LongEnt(this,6);
le.l = Double.doubleToLongBits(((Double)o).doubleValue());
ent = le;
} else if(o instanceof Utf8Key) {
- Utf8Ent ue = new Utf8Ent();
+ Utf8Ent ue = new Utf8Ent(this);
ue.s = ((Utf8Key)o).s;
ent = ue;
} else if(o instanceof NameAndTypeKey) {
- CPRefEnt ce = new CPRefEnt(12);
+ CPRefEnt ce = new CPRefEnt(this,12);
NameAndTypeKey key = (NameAndTypeKey) o;
ce.e1 = addUtf8(key.name);
ce.e2 = addUtf8(key.type);
ClassGen.FieldOrMethodRef key = (ClassGen.FieldOrMethodRef) o;
int tag = o instanceof FieldRef ? 9 : o instanceof MethodRef ? 10 : o instanceof MethodRef.I ? 11 : 0;
if(tag == 0) throw new Error("should never happen");
- CPRefEnt ce = new CPRefEnt(tag);
+ CPRefEnt ce = new CPRefEnt(this,tag);
ce.e1 = add(key.klass);
ce.e2 = addNameAndType(key.name,key.descriptor);
ent = ce;
return ents;
}
- private static void assignIndex(Ent[] ents) {
+ private void assignIndex(Ent[] ents) {
int index = 1;
+ entriesByIndex = new Ent[ents.length*2];
for(int i=0;i<ents.length;i++) {
Ent ent = ents[i];
ent.n = index;
+ entriesByIndex[index] = ent;
index += ent instanceof LongEnt ? 2 : 1;
}
}
assignIndex(ents);
}
+ public void unsafeReopen() {
+ if(state == OPEN) return;
+ for(int i=1;i<entriesByIndex.length;i++) {
+ Ent e = entriesByIndex[i];
+ if(e == null) continue;
+ e.n = 0;
+ }
+ entriesByIndex = null;
+ state = OPEN;
+ }
+
public void dump(DataOutput o) throws IOException {
Ent[] ents = asArray();
Sort.sort(ents,compareFunc);
+ o.writeShort(usedSlots);
for(int i=0;i<ents.length;i++) {
//System.err.println("" + ents[i].n + ": " + ents[i].debugToString());
ents[i].dump(o);
}
}
+
+ CPGen(DataInput in) throws ClassGen.ClassReadExn {
+ usedSlots = i.readUnsignedShort();
+ if(usedSlots==0) throw new ClassGen.ClassReadExn("invalid used slots");
+
+ // these are to remember the CPRefEnt e0 and e1s we have to fix up
+ int[] e1s = new int[usedSlots];
+ int[] e2s = new int[usedSlots];
+
+ entriesByIndex = new Ent[usedSlots];
+
+ for(int index=1;index<usedSlots;index++) {
+ byte tag = i.readByte();
+ Ent e;
+ switch(tag) {
+ case 7: // Object Type
+ case 8: // String
+ case 9: // FieldRef
+ case 10: // MethodRef
+ case 11: // Instance Method Ref
+ case 12: // NameAndType
+ {
+ e = new CPRefEnt(this,tag);
+ e1s[index] = i.readUnsignedShort();;
+ if(tag != 7 && tag != 8) e2s[index] = i.readUnsignedShort();
+ break;
+ }
+ case 3: // Integer
+ case 4: // Float
+ {
+ IntEnt ie;
+ e = ie = new IntEnt(this,tag);
+ ie.i = i.readInt();
+ break;
+ }
+ case 5: // Long
+ case 6: // Double
+ {
+ LongEnt le;
+ e = le = new LongEnt(this,tag);
+ le.l = i.readLong();
+ index++;
+ break;
+ }
+ case 1: // Utf8
+ {
+ Utf8Ent ue;
+ e = ue = new Utf8Ent(this);
+ ue.s = i.readUTF();
+ break;
+ }
+ default:
+ throw new ClassGen.ClassReadExn("invalid cp ent tag");
+ }
+ entriesByIndex[index] = e;
+ }
+
+ for(int index=1;index<usedSlots;index++) {
+ Ent e = entriesByIndex[index];
+ if(e == null) throw new Error("should never happen");
+ if(e instanceof CPRefEnt) {
+ CPRefEnt ce = (CPRefEnt) e;
+ if(e0s[i] == 0 || e0s[i] >= usedSlots) throw new ClassGen.ClassReadExn("invalid cp index");
+ ce.e0 = entriesByIndex[e0s[i]];
+ if(ce.e0 == null) throw new ClassGen.ClassReadExn("invalid cp index");
+ if(ce.tag != 7 && ce.tag != 8) {
+ if(e1s[i] == 0 || e1s[i] >= usedSlots) throw new ClassGen.ClassReadExn("invalid cp index");
+ ce.e1 = entriesByIndex[e1s[i]];
+ if(ce.e1 == null) throw new ClassGen.ClassReadExn("invalid cp index");
+ }
+ switch(ce.tag) {
+ case 7:
+ case 8:
+ if(!(ce.e0 instanceof Utf8Ent)) throw new ClassGen.ClassReadExn("expected a utf8 ent");
+ break;
+ case 9:
+ case 10:
+ case 11:
+ if(!(ce.e1 instanceof CPRefEnt) || ((CPRefEnt)ce.e1).tag != 7)
+ throw new ClassGen.ClassReadExn("expected a type ent");
+ if(!(ce.e2 instanceof CPRefEnt) || ((CPRefEnt)ce.e2).tag != 12)
+ throw new ClassGen.ClassReadExn("expected a name and type ent");
+ break;
+ case 12:
+ if(!(ce.e1 instanceof Utf8Ent)) throw new ClassGen.ClassReadExn("expected a utf8 ent");
+ if(!(ce.e2 instanceof Utf8Ent)) throw new ClassGen.ClassReadExn("expected a utf8 ent");
+ }
+ } else if(e instanceof LongEnt) {
+ index++;
+ }
+ entries.put(e.key(),e);
+ }
+ state = STABLE;
+ }
}
projects / org.ibex.classgen.git / commitdiff