public Enumeration keys() throws JSExn { throw new JSExn("you can't enumerate the keys of this object (class=" + getClass().getName() +")"); }
public JS get(JS key) throws JSExn { return null; }
public void put(JS key, JS val) throws JSExn { throw new JSExn("" + key + " is read only (class=" + getClass().getName() +")"); }
+
+ public InputStream getInputStream() throws IOException {
+ throw new IOException("this object doesn't have a stream associated with it " + getClass().getName() + ")");
+ }
public final boolean hasTrap(JS key) { return getTrap(key) != null; }
public JS callMethod(JS method, JS a0, JS a1, JS a2, JS[] rest, int nargs) throws JSExn {
throw new JSExn("method not found (" + JS.debugToString(method) + ")");
- }
+ }
// FIXME: JSArgs objects, pointers into stack frame
public JS call(JS a0, JS a1, JS a2, JS[] rest, int nargs) throws JSExn {
public final int indexNode(Object o) { return bt().indexNode(o); }
}
+ // FEATURE: JS.StringKeys
+ /* public static StringKeys extends JS {
+ public JS get(JS key) { return JS.isString(key) ? get(JS.toString(key) : null; }
+ ...
+ */
+
JS _unclone() { return this; }
public interface Cloneable { }
JS _unclone() { return clonee.unclone(); }
public JS getClonee() { return clonee; }
public Clone(JS clonee) throws JSExn {
- if(!(clonee instanceof Cloneable)) throw new JSExn("" + getClass().getName() + " isn't cloneable");
+ if(!(clonee instanceof Cloneable)) throw new JSExn("" + clonee.getClass().getName() + " isn't cloneable");
this.clonee = clonee;
}
public boolean jsequals(JS o) { return unclone().jsequals(o.unclone()); }
public JS call(JS a0, JS a1, JS a2, JS[] rest, int nargs) throws JSExn {
return clonee.call(a0, a1, a2, rest, nargs);
}
+ public InputStream getInputStream() throws IOException { return clonee.getInputStream(); }
}
// Static Interpreter Control Methods ///////////////////////////////////////////////////////////////
public static UnpauseCallback pause() throws NotPauseableException {
Interpreter i = Interpreter.current();
if (i.pausecount == -1) throw new NotPauseableException();
+ boolean get;
+ switch(i.f.op[i.pc]) {
+ case Tokens.RETURN: case ByteCodes.PUT: get = false; break;
+ case ByteCodes.GET: get = true; break;
+ default: throw new Error("should never happen");
+ }
i.pausecount++;
- return new JS.UnpauseCallback(i);
+ return new JS.UnpauseCallback(i,get);
}
public static class UnpauseCallback implements Task {
- Interpreter i;
- UnpauseCallback(Interpreter i) { this.i = i; }
- public void perform() throws JSExn { unpause((JS)null); }
- public void unpause(JS o) throws JSExn {
- i.stack.push(o);
- i.resume();
+ private Interpreter i;
+ private boolean get;
+ UnpauseCallback(Interpreter i, boolean get) { this.i = i; this.get = get; }
+ public void perform() throws JSExn { unpause(); }
+ public JS unpause() throws JSExn { return unpause((JS)null); }
+ public JS unpause(JS o) throws JSExn {
+ if (o == JS.METHOD) throw new JSExn("can't return a method to a paused context");
+ if(get) i.stack.push(o);
+ return i.resume();
}
- public void unpause(JSExn e) {
- // FIXME: Throw the JSExn into the js world
- throw new Error("Exception " + e + " thrown from background task");
+ public JS unpause(JSExn e) throws JSExn {
+ i.catchException(e);
+ return i.resume();
}
}
public static final JS B(boolean b) { return b ? T : F; }
public static final JS B(int i) { return i==0 ? F : T; }
- public static final JS S(String s) { return new JSString(s); }
+ private static final int CACHE_SIZE = 65536 / 4; // must be a power of two
+ private static final JSString[] stringCache = new JSString[CACHE_SIZE];
+ public static final JS S(String s) {
+ if(s == null) return null;
+ int slot = s.hashCode()&(CACHE_SIZE-1);
+ JSString ret = stringCache[slot];
+ if(ret == null || !ret.s.equals(s)) stringCache[slot] = ret = new JSString(s);
+ return ret;
+ }
public static final JS N(double d) { return new JSNumber.D(d); }
public static final JS N(long l) { return new JSNumber.L(l); }
return N(n.doubleValue());
}
- private static final JSNumber.I[] smallIntCache = new JSNumber.I[65535 / 4];
- private static final JSNumber.I[] largeIntCache = new JSNumber.I[65535 / 4];
+ private static final JSNumber.I[] smallIntCache = new JSNumber.I[CACHE_SIZE];
+ private static final JSNumber.I[] largeIntCache = new JSNumber.I[CACHE_SIZE];
public static final JS N(int i) {
JSNumber.I ret = null;
int idx = i + smallIntCache.length / 2;
- if (idx < smallIntCache.length && idx > 0) {
+ if (idx < CACHE_SIZE && idx > 0) {
ret = smallIntCache[idx];
if (ret != null) return ret;
}
- else ret = largeIntCache[Math.abs(idx % largeIntCache.length)];
+ else ret = largeIntCache[Math.abs(idx % CACHE_SIZE)];
if (ret == null || ret.i != i) {
ret = new JSNumber.I(i);
if (idx < smallIntCache.length && idx > 0) smallIntCache[idx] = ret;
- else largeIntCache[Math.abs(idx % largeIntCache.length)] = ret;
+ else largeIntCache[Math.abs(idx % CACHE_SIZE)] = ret;
}
return ret;
}