import org.xwt.util.*;
import java.io.*;
-// FIXME: could use some cleaning up
/** a JavaScript function, compiled into bytecode */
-class CompiledFunctionImpl extends JSCallable implements ByteCodes, Tokens {
+class CompiledFunctionImpl extends JS.Obj implements ByteCodes, Tokens {
// Fields and Accessors ///////////////////////////////////////////////
+ /** the number of formal arguments */
+ int numFormalArgs = 20;
+
/** the source code file that this block was drawn from */
- private String sourceName;
+ String sourceName;
public String getSourceName() throws JS.Exn { return sourceName; }
/** the line numbers */
- private int[] line = new int[10];
+ int[] line = new int[10];
/** the first line of this script */
private int firstLine = -1;
/** the instructions */
- private int[] op = new int[10];
+ int[] op = new int[10];
/** the arguments to the instructions */
- private Object[] arg = new Object[10];
+ Object[] arg = new Object[10];
/** the number of instruction/argument pairs */
- private int size = 0;
+ int size = 0;
int size() { return size; }
/** the scope in which this function was declared; by default this function is called in a fresh subscope of the parentScope */
- private JS.Scope parentScope;
-
+ JS.Scope parentScope;
// Constructors ////////////////////////////////////////////////////////
private CompiledFunctionImpl cloneWithNewParentScope(JS.Scope s) throws IOException {
CompiledFunctionImpl ret = new JS.CompiledFunction(sourceName, firstLine, null, s);
- ret.paste(this);
+ // Reuse the same op, arg, line, and size variables for the new "instance" of the function
+ // NOTE: Neither *this* function nor the new function should be modified after this call
+ ret.op = this.op;
+ ret.arg = this.arg;
+ ret.line = this.line;
+ ret.size = this.size;
+ ret.numFormalArgs = this.numFormalArgs;
return ret;
}
p.parseStatement(this, null);
if (s == size()) break;
}
- add(-1, Tokens.RETURN);
+ add(-1, LITERAL, null);
+ add(-1, RETURN);
}
- public Object call(JS.Array args) throws JS.Exn { return call(args, new FunctionScope(sourceName, parentScope)); }
- public Object call(JS.Array args, JS.Scope scope) throws JS.Exn {
- JS.Thread cx = JS.Thread.fromJavaThread(java.lang.Thread.currentThread());
- CompiledFunction saved = cx.currentCompiledFunction;
- try {
- cx.currentCompiledFunction = (CompiledFunction)this;
- int size = cx.stack.size();
- cx.stack.push(new CallMarker());
- cx.stack.push(args);
- eval(scope);
- Object ret = cx.stack.pop();
- if (cx.stack.size() > size) Log.logJS(this, "warning, stack grew by " + (cx.stack.size() - size) + " elements during call");
- return ret;
- } finally {
- cx.currentCompiledFunction = saved;
- }
- }
// Adding and Altering Bytecodes ///////////////////////////////////////////////////
int get(int pos) { return op[pos]; }
+ Object getArg(int pos) { return arg[pos]; }
void set(int pos, int op_, Object arg_) { op[pos] = op_; arg[pos] = arg_; }
void set(int pos, Object arg_) { arg[pos] = arg_; }
+ int pop() { size--; arg[size] = null; return op[size]; }
void paste(CompiledFunctionImpl other) { for(int i=0; i<other.size; i++) add(other.line[i], other.op[i], other.arg[i]); }
CompiledFunctionImpl add(int line, int op_) { return add(line, op_, null); }
CompiledFunctionImpl add(int line, int op_, Object arg_) {
size++;
return this;
}
+
+ public static int getLine(JS.Thread cx) {
+ if(cx.pc < 0 || cx.pc >= ((CompiledFunctionImpl)cx.currentCompiledFunction).size) return -1;
+ return ((CompiledFunctionImpl)cx.currentCompiledFunction).line[cx.pc];
+ }
// Invoking the Bytecode ///////////////////////////////////////////////////////
-
- int pc = 0;
- void eval(JS.Scope s) {
- final JS.Thread cx = JS.Thread.fromJavaThread(java.lang.Thread.currentThread());
- final Vec t = cx.stack;
- OUTER: for(pc=0; pc<size; pc++) {
+
+ /** returns false if the thread has been paused */
+ static Object eval(final JS.Thread cx) throws JS.Exn {
+ OUTER: for(;; cx.pc++) {
+ try {
+ if (cx.paused) return null;
+ cx.bind();
+ if (cx.tailCallFunction != null) {
+ cx.stack.pop(); // discard actual return value
+ cx.pc -= 2;
+ cx.stack.push(new CallMarker(cx));
+ cx.stack.push(cx.tailCallArgs);
+ cx.currentCompiledFunction = cx.tailCallFunction;
+ cx.tailCallFunction = null;
+ cx.tailCallArgs = null;
+ cx.scope = new FunctionScope("unknown", cx.currentCompiledFunction.parentScope);
+ cx.pc = 0;
+ }
+ if (cx.currentCompiledFunction == null) return cx.stack.pop();
+ if (cx.pc >= ((CompiledFunctionImpl)cx.currentCompiledFunction).size) return cx.stack.pop();
String label = null;
- cx.line = line[pc];
- switch(op[pc]) {
- case LITERAL: t.push(arg[pc]); break;
- case OBJECT: t.push(new JS.Obj()); break;
- case ARRAY: t.push(new JS.Array(JS.toNumber(arg[pc]).intValue())); break;
- case DECLARE: s.declare((String)t.pop()); break;
- case TOPSCOPE: t.push(s); break;
- case JT: if (JS.toBoolean(t.pop())) pc += JS.toNumber(arg[pc]).intValue() - 1; break;
- case JF: if (!JS.toBoolean(t.pop())) pc += JS.toNumber(arg[pc]).intValue() - 1; break;
- case JMP: pc += JS.toNumber(arg[pc]).intValue() - 1; break;
- case POP: t.pop(); break;
- case SWAP: { Object o1 = t.pop(); Object o2 = t.pop(); t.push(o1); t.push(o2); break; }
- case DUP: t.push(t.peek()); break;
- case NEWSCOPE: /*s = new JS.Scope(s);*/ break;
- case OLDSCOPE: /*s = s.getParentScope();*/ break;
- case ASSERT: if (!JS.toBoolean(t.pop())) throw je("assertion failed"); break;
- case BITNOT: t.push(new Long(~JS.toLong(t.pop()))); break;
- case BANG: t.push(new Boolean(!JS.toBoolean(t.pop()))); break;
+ int curOP = cx.currentCompiledFunction.op[cx.pc];
+ Object curArg = cx.currentCompiledFunction.arg[cx.pc];
+ if(curOP == FINALLY_DONE) {
+ FinallyData fd = (FinallyData) cx.stack.pop();
+ if(fd == null) continue OUTER; // NOP
+ curOP = fd.op;
+ curArg = fd.arg;
+ }
+ switch(curOP) {
+ case LITERAL: cx.stack.push(curArg); break;
+ case OBJECT: cx.stack.push(new JS.Obj()); break;
+ case ARRAY: cx.stack.push(new JS.Array(JS.toNumber(curArg).intValue())); break;
+ case DECLARE: cx.scope.declare((String)(curArg==null ? cx.stack.peek() : curArg)); if(curArg != null) cx.stack.push(curArg); break;
+ case TOPSCOPE: cx.stack.push(cx.scope); break;
+ case JT: if (JS.toBoolean(cx.stack.pop())) cx.pc += JS.toNumber(curArg).intValue() - 1; break;
+ case JF: if (!JS.toBoolean(cx.stack.pop())) cx.pc += JS.toNumber(curArg).intValue() - 1; break;
+ case JMP: cx.pc += JS.toNumber(curArg).intValue() - 1; break;
+ case POP: cx.stack.pop(); break;
+ case SWAP: { Object o1 = cx.stack.pop(); Object o2 = cx.stack.pop(); cx.stack.push(o1); cx.stack.push(o2); break; }
+ case DUP: cx.stack.push(cx.stack.peek()); break;
+ case NEWSCOPE: cx.scope = new JS.Scope(cx.scope); break;
+ case OLDSCOPE: cx.scope = cx.scope.getParentScope(); break;
+ case ASSERT: if (!JS.toBoolean(cx.stack.pop())) throw je("assertion failed"); break;
+ case BITNOT: cx.stack.push(new Long(~JS.toLong(cx.stack.pop()))); break;
+ case BANG: cx.stack.push(new Boolean(!JS.toBoolean(cx.stack.pop()))); break;
case TYPEOF: {
- Object o = t.pop();
- if (o == null) t.push(null);
- else if (o instanceof org.xwt.Box) t.push("Box");
- else if (o instanceof JS) t.push("Object");
- else if (o instanceof String) t.push("String");
- else if (o instanceof Number) t.push("Number");
- else if (o.getClass().getName().startsWith("org.xwt.js.")) t.push(o.getClass().getName().substring(11));
- else t.push("unknown");
+ Object o = cx.stack.pop();
+ if (o == null) cx.stack.push(null);
+ else if (o instanceof JS) cx.stack.push(((JS)o).typeName());
+ else if (o instanceof String) cx.stack.push("string");
+ else if (o instanceof Number) cx.stack.push("number");
+ else if (o instanceof Boolean) cx.stack.push("boolean");
+ else cx.stack.push("unknown");
break;
}
case NEWFUNCTION: {
try {
- t.push(((CompiledFunctionImpl)arg[pc]).cloneWithNewParentScope(s));
+ cx.stack.push(((CompiledFunctionImpl)curArg).cloneWithNewParentScope(cx.scope));
} catch (IOException e) {
throw new Error("this should never happen");
}
}
case PUSHKEYS: {
- Object o = t.peek();
+ Object o = cx.stack.peek();
Object[] keys = ((JS)o).keys();
JS.Array a = new JS.Array();
a.setSize(keys.length);
for(int j=0; j<keys.length; j++) a.setElementAt(keys[j], j);
- t.push(a);
+ cx.stack.push(a);
break;
}
case LABEL: break;
case LOOP: {
- t.push(s);
- t.push(new LoopMarker(pc, pc > 0 && op[pc - 1] == LABEL ? (String)arg[pc - 1] : (String)null));
- t.push(Boolean.TRUE);
+ cx.stack.push(new LoopMarker(cx.pc, cx.pc > 0 && cx.currentCompiledFunction.op[cx.pc - 1] == LABEL ? (String)cx.currentCompiledFunction.arg[cx.pc - 1] : (String)null, cx.scope));
+ cx.stack.push(Boolean.TRUE);
break;
}
case BREAK:
case CONTINUE:
- while(t.size() > 0) {
- Object o = t.pop();
+ while(cx.stack.size() > 0) {
+ Object o = cx.stack.pop();
if (o instanceof CallMarker) ee("break or continue not within a loop");
- if (o != null && o instanceof LoopMarker) {
- if (arg[pc] == null || arg[pc].equals(((LoopMarker)o).label)) {
+ if (o instanceof TryMarker) {
+ if(((TryMarker)o).finallyLoc < 0) continue; // no finally block, keep going
+ cx.stack.push(new FinallyData(curOP, curArg));
+ cx.scope = ((TryMarker)o).scope;
+ cx.pc = ((TryMarker)o).finallyLoc - 1;
+ continue OUTER;
+ }
+ if (o instanceof LoopMarker) {
+ if (curArg == null || curArg.equals(((LoopMarker)o).label)) {
int loopInstructionLocation = ((LoopMarker)o).location;
- int endOfLoop = ((Integer)arg[loopInstructionLocation]).intValue() + loopInstructionLocation;
- s = (JS.Scope)t.pop();
- if (op[pc] == CONTINUE) { t.push(s); t.push(o); t.push(Boolean.FALSE); }
- pc = op[pc] == BREAK ? endOfLoop - 1 : loopInstructionLocation;
+ int endOfLoop = ((Integer)cx.currentCompiledFunction.arg[loopInstructionLocation]).intValue() + loopInstructionLocation;
+ cx.scope = ((LoopMarker)o).scope;
+ if (curOP == CONTINUE) { cx.stack.push(o); cx.stack.push(Boolean.FALSE); }
+ cx.pc = curOP == BREAK ? endOfLoop - 1 : loopInstructionLocation;
continue OUTER;
}
}
}
- throw new Error("CONTINUE/BREAK invoked but couldn't find a LoopMarker at " + sourceName + ":" + line);
+ throw new Error("CONTINUE/BREAK invoked but couldn't find a LoopMarker at " + ((CompiledFunctionImpl)cx.currentCompiledFunction).sourceName + ":" + getLine(cx));
case TRY: {
- t.push(new TryMarker(pc + ((Integer)arg[pc]).intValue(), s));
+ int[] jmps = (int[]) curArg;
+ // jmps[0] is how far away the catch block is, jmps[1] is how far away the finally block is
+ // each can be < 0 if the specified block does not exist
+ cx.stack.push(new TryMarker(jmps[0] < 0 ? -1 : cx.pc + jmps[0], jmps[1] < 0 ? -1 : cx.pc + jmps[1], cx.scope));
break;
}
case RETURN: {
- Object retval = t.pop();
- while(t.size() > 0) {
- Object o = t.pop();
- if (o != null && o instanceof CallMarker) {
- t.push(retval);
- return;
+ Object retval = cx.stack.pop();
+ while(cx.stack.size() > 0) {
+ Object o = cx.stack.pop();
+ if (o instanceof TryMarker) {
+ if(((TryMarker)o).finallyLoc < 0) continue;
+ cx.stack.push(retval);
+ cx.stack.push(new FinallyData(RETURN));
+ cx.scope = ((TryMarker)o).scope;
+ cx.pc = ((TryMarker)o).finallyLoc - 1;
+ continue OUTER;
+ }
+ if (o instanceof CallMarker) {
+ cx.scope = ((CallMarker)o).scope;
+ cx.pc = ((CallMarker)o).pc;
+ cx.currentCompiledFunction = (CompiledFunction)((CallMarker)o).currentCompiledFunction;
+ cx.stack.push(retval);
+ continue OUTER;
}
}
throw new Error("error: RETURN invoked but couldn't find a CallMarker!");
}
case PUT: {
- Object val = t.pop();
- Object key = t.pop();
- Object target = t.peek();
+ Object val = cx.stack.pop();
+ Object key = cx.stack.pop();
+ Object target = cx.stack.peek();
if (target == null)
throw je("tried to put a value to the " + key + " property on the null value");
if (!(target instanceof JS))
throw je("tried to put a value to the " + key + " property on a " + target.getClass().getName());
+ if (key == null)
+ throw je("tried to assign \"" + (val==null?"(null)":val.toString()) + "\" to the null key");
((JS)target).put(key, val);
- t.push(val);
+ cx.stack.push(val);
break;
}
case GET:
case GET_PRESERVE: {
Object o, v;
- if (op[pc] == GET) {
- v = t.pop();
- o = t.pop();
+ if (curOP == GET) {
+ v = curArg == null ? cx.stack.pop() : curArg;
+ o = cx.stack.pop();
} else {
- v = t.pop();
- o = t.peek();
- t.push(v);
+ v = cx.stack.pop();
+ o = cx.stack.peek();
+ cx.stack.push(v);
}
Object ret = null;
if (o == null) throw je("tried to get property \"" + v + "\" from the null value");
- if (v == null) throw je("tried to get the null key from " + v);
- if (o instanceof String) {
- ret = getFromString((String)o, v);
- } else if (o instanceof Boolean) {
- throw je("Not Implemented: properties on Boolean objects");
- } else if (o instanceof Number) {
- Log.log(this, "Not Implemented: properties on Number objects");
- } else if (o instanceof JS) {
+ if (v == null) throw je("tried to get the null key from " + o);
+ if (o instanceof String || o instanceof Number || o instanceof Boolean)
+ ret = Internal.getFromPrimitive(o,v);
+ else if (o instanceof JS) {
ret = ((JS)o).get(v);
- }
- t.push(ret);
+ } else
+ throw je("tried to get property " + v + " from a " + o.getClass().getName());
+ cx.stack.push(ret);
break;
}
-
- case CALL: {
+
+ case CALLMETHOD:
+ case CALL:
+ {
JS.Array arguments = new JS.Array();
- int numArgs = JS.toNumber(arg[pc]).intValue();
+ int numArgs = JS.toNumber(curArg).intValue();
arguments.setSize(numArgs);
- for(int j=numArgs - 1; j >= 0; j--) arguments.setElementAt(t.pop(), j);
- JS.Callable f = (JS.Callable)t.pop();
- if (f == null) throw je("attempted to call null");
- try {
- t.push(f.call(arguments));
+ for(int j=numArgs - 1; j >= 0; j--) arguments.setElementAt(cx.stack.pop(), j);
+ Object o = cx.stack.pop();
+ if(o == null) throw je("attempted to call null");
+ Object ret;
+ if(curOP == CALLMETHOD) {
+ Object method = o;
+ o = cx.stack.pop();
+ if(o instanceof String || o instanceof Number || o instanceof Boolean) {
+ ret = Internal.callMethodOnPrimitive(o,method,arguments);
+ cx.stack.push(ret);
+ break;
+ } else if (o instanceof JS) {
+ if (((JS)o).callMethod(method, arguments, true) == Boolean.TRUE) {
+ ret = ((JS)o).callMethod(method,arguments,false);
+ cx.stack.push(ret);
+ break;
+ } else {
+ o = ((JS)o).get(method);
+ }
+ } else {
+ throw new JS.Exn("Tried to call a method on an object that isn't a JS object: " + o);
+ }
+ }
+
+ if (o instanceof CompiledFunctionImpl) {
+ cx.stack.push(new CallMarker(cx));
+ cx.stack.push(arguments);
+ cx.currentCompiledFunction = (CompiledFunction)o;
+ cx.scope = new FunctionScope("unknown", cx.currentCompiledFunction.parentScope);
+ cx.pc = -1;
break;
- } catch (JS.Exn e) {
- t.push(e);
+
+ } else {
+ ret = ((JS.Callable)o).call(arguments);
}
+ cx.stack.push(ret);
+ break;
}
// fall through if exception was thrown
case THROW: {
- Object exn = t.pop();
- while(t.size() > 0) {
- Object o = t.pop();
- if (o instanceof TryMarker) {
- t.push(exn);
- pc = ((TryMarker)o).location - 1;
- s = ((TryMarker)o).scope;
- continue OUTER;
- }
- }
- throw new JS.Exn(exn);
+ Object o = cx.stack.pop();
+ if(o instanceof JS.Exn) throw (JS.Exn)o;
+ throw new JS.Exn(o);
}
case INC: case DEC: {
- boolean isPrefix = JS.toBoolean(arg[pc]);
- Object key = t.pop();
- JS obj = (JS)t.pop();
+ boolean isPrefix = JS.toBoolean(curArg);
+ Object key = cx.stack.pop();
+ JS obj = (JS)cx.stack.pop();
Number num = JS.toNumber(obj.get(key));
- Number val = new Double(op[pc] == INC ? num.doubleValue() + 1.0 : num.doubleValue() - 1.0);
+ Number val = new Double(curOP == INC ? num.doubleValue() + 1.0 : num.doubleValue() - 1.0);
obj.put(key, val);
- t.push(isPrefix ? val : num);
+ cx.stack.push(isPrefix ? val : num);
+ break;
+ }
+
+ case ASSIGN_SUB: case ASSIGN_ADD: {
+ Object val = cx.stack.pop();
+ Object old = cx.stack.pop();
+ Object key = cx.stack.pop();
+ Object obj = cx.stack.peek();
+ if (val instanceof CompiledFunction) {
+ if (obj instanceof JS.Scope) {
+ JS.Scope parent = (JS.Scope)obj;
+ while(parent.getParentScope() != null) parent = parent.getParentScope();
+ if (parent instanceof org.xwt.Box) {
+ if (curOP == ASSIGN_ADD) {
+ ((org.xwt.Box)parent).addTrap(key, val);
+ } else {
+ ((org.xwt.Box)parent).delTrap(key, val);
+ }
+ // skip over the "normal" implementation of +=/-=
+ cx.pc += ((Integer)curArg).intValue() - 1;
+ break;
+ }
+ }
+ }
+ // use the "normal" implementation
+ cx.stack.push(key);
+ cx.stack.push(old);
+ cx.stack.push(val);
break;
}
- default: {
- Object right = t.pop();
- Object left = t.pop();
- switch(op[pc]) {
-
- case ADD: {
- Object l = left;
- Object r = right;
- if (l instanceof String || r instanceof String) {
- if (l == null) l = "null";
- if (r == null) r = "null";
- if (l instanceof Number && ((Number)l).doubleValue() == ((Number)l).longValue())
- l = new Long(((Number)l).longValue());
- if (r instanceof Number && ((Number)r).doubleValue() == ((Number)r).longValue())
- r = new Long(((Number)r).longValue());
- t.push(l.toString() + r.toString()); break;
+ case ADD: {
+ int count = ((Number)curArg).intValue();
+ if(count < 2) throw new Error("this should never happen");
+ if(count == 2) {
+ // common case
+ Object right = cx.stack.pop();
+ Object left = cx.stack.pop();
+ if(left instanceof String || right instanceof String) cx.stack.push(JS.toString(left).concat(JS.toString(right)));
+ else cx.stack.push(new Double(JS.toDouble(left) + JS.toDouble(right)));
+ } else {
+ Object[] args = new Object[count];
+ while(--count >= 0) args[count] = cx.stack.pop();
+ if(args[0] instanceof String) {
+ StringBuffer sb = new StringBuffer(64);
+ for(int i=0;i<args.length;i++) sb.append(JS.toString(args[i]));
+ cx.stack.push(sb.toString());
+ } else {
+ int numStrings = 0;
+ for(int i=0;i<args.length;i++) if(args[i] instanceof String) numStrings++;
+ if(numStrings == 0) {
+ double d = 0.0;
+ for(int i=0;i<args.length;i++) d += JS.toDouble(args[i]);
+ cx.stack.push(new Double(d));
+ } else {
+ int i=0;
+ StringBuffer sb = new StringBuffer(64);
+ if(!(args[0] instanceof String || args[1] instanceof String)) {
+ double d=0.0;
+ do {
+ d += JS.toDouble(args[i++]);
+ } while(!(args[i] instanceof String));
+ sb.append(JS.toString(new Double(d)));
+ }
+ while(i < args.length) sb.append(JS.toString(args[i++]));
+ cx.stack.push(sb.toString());
+ }
}
- t.push(new Double(JS.toDouble(l) + JS.toDouble(r))); break;
}
+ break;
+ }
+
+ default: {
+ Object right = cx.stack.pop();
+ Object left = cx.stack.pop();
+ switch(curOP) {
- case BITOR: t.push(new Long(JS.toLong(left) | JS.toLong(right))); break;
- case BITXOR: t.push(new Long(JS.toLong(left) ^ JS.toLong(right))); break;
- case BITAND: t.push(new Long(JS.toLong(left) & JS.toLong(right))); break;
-
- case SUB: t.push(new Double(JS.toDouble(left) - JS.toDouble(right))); break;
- case MUL: t.push(new Double(JS.toDouble(left) * JS.toDouble(right))); break;
- case DIV: t.push(new Double(JS.toDouble(left) / JS.toDouble(right))); break;
- case MOD: t.push(new Double(JS.toDouble(left) % JS.toDouble(right))); break;
+ case BITOR: cx.stack.push(new Long(JS.toLong(left) | JS.toLong(right))); break;
+ case BITXOR: cx.stack.push(new Long(JS.toLong(left) ^ JS.toLong(right))); break;
+ case BITAND: cx.stack.push(new Long(JS.toLong(left) & JS.toLong(right))); break;
+
+ case SUB: cx.stack.push(new Double(JS.toDouble(left) - JS.toDouble(right))); break;
+ case MUL: cx.stack.push(new Double(JS.toDouble(left) * JS.toDouble(right))); break;
+ case DIV: cx.stack.push(new Double(JS.toDouble(left) / JS.toDouble(right))); break;
+ case MOD: cx.stack.push(new Double(JS.toDouble(left) % JS.toDouble(right))); break;
- case LSH: t.push(new Long(JS.toLong(left) << JS.toLong(right))); break;
- case RSH: t.push(new Long(JS.toLong(left) >> JS.toLong(right))); break;
- case URSH: t.push(new Long(JS.toLong(left) >>> JS.toLong(right))); break;
+ case LSH: cx.stack.push(new Long(JS.toLong(left) << JS.toLong(right))); break;
+ case RSH: cx.stack.push(new Long(JS.toLong(left) >> JS.toLong(right))); break;
+ case URSH: cx.stack.push(new Long(JS.toLong(left) >>> JS.toLong(right))); break;
case LT: case LE: case GT: case GE: {
if (left == null) left = new Integer(0);
} else {
result = (int)java.lang.Math.ceil(JS.toDouble(left) - JS.toDouble(right));
}
- t.push(new Boolean((op[pc] == LT && result < 0) || (op[pc] == LE && result <= 0) ||
- (op[pc] == GT && result > 0) || (op[pc] == GE && result >= 0)));
+ cx.stack.push(new Boolean((curOP == LT && result < 0) || (curOP == LE && result <= 0) ||
+ (curOP == GT && result > 0) || (curOP == GE && result >= 0)));
break;
}
boolean ret;
if (l == null) { Object tmp = r; r = l; l = tmp; }
if (l == null && r == null) ret = true;
+ else if (r == null) ret = false; // l != null, so its false
else if (l instanceof Boolean) ret = new Boolean(JS.toBoolean(r)).equals(l);
else if (l instanceof Number) ret = JS.toNumber(r).doubleValue() == JS.toNumber(l).doubleValue();
else if (l instanceof String) ret = r != null && l.equals(r.toString());
else ret = l.equals(r);
- t.push(new Boolean(op[pc] == EQ ? ret : !ret)); break;
+ cx.stack.push(new Boolean(curOP == EQ ? ret : !ret)); break;
}
- default: throw new Error("unknown opcode " + op[pc]);
+ default: throw new Error("unknown opcode " + curOP);
} }
}
- }
- }
-
-
- // Helpers for Number, String, and Boolean ////////////////////////////////////////
-
- private static Object getFromString(final String o, final Object v) {
- if (v.equals("length")) return new Integer(((String)o).length());
- else if (v.equals("substring")) return new JS.Callable() {
- public Object call(JS.Array args) {
- if (args.length() == 1) return ((String)o).substring(JS.toNumber(args.elementAt(0)).intValue());
- else if (args.length() == 2) return ((String)o).substring(JS.toNumber(args.elementAt(0)).intValue(),
- JS.toNumber(args.elementAt(1)).intValue());
- else throw new JS.Exn("String.substring() can only take one or two arguments");
+ } catch(JS.Exn e) {
+ while(cx.stack.size() > 0) {
+ Object o = cx.stack.pop();
+ if (o instanceof CatchMarker || o instanceof TryMarker) {
+ boolean inCatch = o instanceof CatchMarker;
+ if(inCatch) {
+ o = cx.stack.pop();
+ if(((TryMarker)o).finallyLoc < 0) continue; // no finally block, keep going
+ }
+ if(!inCatch && ((TryMarker)o).catchLoc >= 0) {
+ // run the catch block, this will implicitly run the finally block, if it exists
+ cx.stack.push(o);
+ cx.stack.push(catchMarker);
+ cx.stack.push(e.getObject());
+ cx.scope = ((TryMarker)o).scope;
+ cx.pc = ((TryMarker)o).catchLoc - 1;
+ continue OUTER;
+ } else {
+ cx.stack.push(e);
+ cx.stack.push(new FinallyData(THROW));
+ cx.scope = ((TryMarker)o).scope;
+ cx.pc = ((TryMarker)o).finallyLoc - 1;
+ continue OUTER;
+ }
}
- };
- else if (v.equals("toLowerCase")) return new JS.Callable() {
- public Object call(JS.Array args) {
- return ((String)o).toLowerCase();
- } };
- else if (v.equals("toUpperCase")) return new JS.Callable() {
- public Object call(JS.Array args) {
- return ((String)o).toString().toUpperCase();
- } };
- else if (v.equals("charAt")) return new JS.Callable() {
- public Object call(JS.Array args) {
- return ((String)o).charAt(JS.toNumber(args.elementAt(0)).intValue()) + "";
- } };
- else if (v.equals("lastIndexOf")) return new JS.Callable() {
- public Object call(JS.Array args) {
- if (args.length() != 1) return null;
- return new Integer(((String)o).lastIndexOf(args.elementAt(0).toString()));
- } };
- else if (v.equals("indexOf")) return new JS.Callable() {
- public Object call(JS.Array args) {
- if (args.length() != 1) return null;
- return new Integer(((String)o).indexOf(args.elementAt(0).toString()));
- } };
- throw new JS.Exn("Not Implemented: propery " + v + " on String objects");
+ // no handler found within this func
+ if(o instanceof CallMarker) throw e;
+ }
+ throw e;
+ } // end try/catch
+ } // end for
}
+ // Debugging //////////////////////////////////////////////////////////////////////
+
+ public String toString() {
+ StringBuffer sb = new StringBuffer(1024);
+ sb.append("\n" + sourceName + ": " + firstLine + "\n");
+ for (int i=0; i < size; i++) {
+ sb.append(i);
+ sb.append(": ");
+ if (op[i] < 0)
+ sb.append(bytecodeToString[-op[i]]);
+ else
+ sb.append(codeToString[op[i]]);
+ sb.append(" ");
+ sb.append(arg[i] == null ? "(no arg)" : arg[i]);
+ if((op[i] == JF || op[i] == JT || op[i] == JMP) && arg[i] != null && arg[i] instanceof Number) {
+ sb.append(" jump to ").append(i+((Number) arg[i]).intValue());
+ } else if(op[i] == TRY) {
+ int[] jmps = (int[]) arg[i];
+ sb.append(" catch: ").append(jmps[0] < 0 ? "No catch block" : ""+(i+jmps[0]));
+ sb.append(" finally: ").append(jmps[1] < 0 ? "No finally block" : ""+(i+jmps[1]));
+ }
+ sb.append("\n");
+ }
+ return sb.toString();
+ }
// Exception Stuff ////////////////////////////////////////////////////////////////
static class EvaluatorException extends RuntimeException { public EvaluatorException(String s) { super(s); } }
- EvaluatorException ee(String s) { throw new EvaluatorException(sourceName + ":" + line[pc] + " " + s); }
- JS.Exn je(String s) { throw new JS.Exn(sourceName + ":" + line[pc] + " " + s); }
+ static EvaluatorException ee(String s) { throw new EvaluatorException(((CompiledFunctionImpl)(JS.Thread.current()).currentCompiledFunction).sourceName + ":" + JS.Thread.current().getLine() + " " + s); }
+ static JS.Exn je(String s) { throw new JS.Exn(((CompiledFunctionImpl)(JS.Thread.current()).currentCompiledFunction).sourceName + ":" + JS.Thread.current().getLine() + " " + s); }
// FunctionScope /////////////////////////////////////////////////////////////////
- private class FunctionScope extends JS.Scope {
+ static class FunctionScope extends JS.Scope {
String sourceName;
public FunctionScope(String sourceName, Scope parentScope) { super(parentScope); this.sourceName = sourceName; }
public String getSourceName() { return sourceName; }
- public Object get(Object key) throws JS.Exn {
- if (key.equals("trapee")) return org.xwt.Trap.currentTrapee();
- else if (key.equals("cascade")) return org.xwt.Trap.cascadeFunction;
- return super.get(key);
- }
}
// Markers //////////////////////////////////////////////////////////////////////
- public static class CallMarker { public CallMarker() { } }
+ public static class CallMarker {
+ int pc;
+ Scope scope;
+ CompiledFunctionImpl currentCompiledFunction;
+ public CallMarker(JS.Thread cx) { pc = cx.pc + 1; scope = cx.scope; currentCompiledFunction = cx.currentCompiledFunction; }
+ }
+
+ public static class CatchMarker { public CatchMarker() { } }
+ private static CatchMarker catchMarker = new CatchMarker();
+
public static class LoopMarker {
public int location;
public String label;
- public LoopMarker(int location, String label) {
+ public JS.Scope scope;
+ public LoopMarker(int location, String label, JS.Scope scope) {
this.location = location;
this.label = label;
+ this.scope = scope;
}
}
public static class TryMarker {
- public int location;
+ public int catchLoc;
+ public int finallyLoc;
public JS.Scope scope;
- public TryMarker(int location, JS.Scope scope) {
- this.location = location;
+ public TryMarker(int catchLoc, int finallyLoc, JS.Scope scope) {
+ this.catchLoc = catchLoc;
+ this.finallyLoc = finallyLoc;
this.scope = scope;
}
}
-
+ public static class FinallyData {
+ public int op;
+ public Object arg;
+ public FinallyData(int op, Object arg) { this.op = op; this.arg = arg; }
+ public FinallyData(int op) { this(op,null); }
+ }
}
+/** this class exists solely to work around a GCJ bug */
abstract class JSCallable extends JS.Callable {
public abstract Object call(JS.Array args) throws JS.Exn;
}