1 // Copyright 2003 Adam Megacz, see the COPYING file for licensing [GPL]
7 // FIXME: could use some cleaning up
8 /** a JavaScript function, compiled into bytecode */
9 class CompiledFunctionImpl extends JS.Callable implements ByteCodes, Tokens {
11 // Fields and Accessors ///////////////////////////////////////////////
13 /** the source code file that this block was drawn from */
14 private String sourceName;
15 public String getSourceName() throws JS.Exn { return sourceName; }
17 /** the line numbers */
18 private int[] line = new int[10];
20 /** the instructions */
21 private int[] op = new int[10];
23 /** the arguments to the instructions */
24 private Object[] arg = new Object[10];
26 /** the number of instruction/argument pairs */
28 int size() { return size; }
30 /** the scope in which this function was declared; by default this function is called in a fresh subscope of the parentScope */
31 private JS.Scope parentScope;
34 // Constructors ////////////////////////////////////////////////////////
36 private CompiledFunctionImpl cloneWithNewParentScope(JS.Scope s) throws IOException {
37 CompiledFunctionImpl ret = new JS.CompiledFunction(sourceName, firstLine, null, s);
42 protected CompiledFunctionImpl(String sourceName, int firstLine, Reader sourceCode, JS.Scope parentScope) throws IOException {
43 this.sourceName = sourceName;
44 this.firstLine = firstLine;
45 this.parentScope = parentScope;
46 if (sourceCode == null) return;
47 Parser p = new Parser(sourceCode, sourceName, firstLine);
51 p.parseStatement(this, null);
52 if (s == size()) break;
54 add(-1, Tokens.RETURN);
55 } catch (Exception e) {
56 if (Log.on) Log.log(Parser.class, e);
60 public Object call(JS.Array args) throws JS.Exn { return call(args, new FunctionScope(sourceName, parentScope)); }
61 public Object call(JS.Array args, JS.Scope scope) throws JS.Exn {
62 JS.Thread cx = JS.Thread.fromJavaThread(java.lang.Thread.currentThread());
63 CompiledFunction saved = cx.currentCompiledFunction;
65 cx.currentCompiledFunction = (CompiledFunction)this;
66 int size = cx.stack.size();
67 cx.stack.push(new CallMarker());
70 Object ret = cx.stack.pop();
71 if (cx.stack.size() > size) Log.logJS(this, "warning, stack grew by " + (cx.stack.size() - size) + " elements during call");
74 cx.currentCompiledFunction = saved;
79 // Adding and Altering Bytecodes ///////////////////////////////////////////////////
81 int get(int pos) { return op[pos]; }
82 void set(int pos, int op_, Object arg_) { op[pos] = op_; arg[pos] = arg_; }
83 void set(int pos, Object arg_) { arg[pos] = arg_; }
84 void paste(CompiledFunctionImpl other) { for(int i=0; i<other.size; i++) add(other.line[i], other.op[i], other.arg[i]); }
85 CompiledFunctionImpl add(int line, int op_) { return add(line, op_, null); }
86 CompiledFunctionImpl add(int line, int op_, Object arg_) {
87 if (size == op.length - 1) {
88 int[] line2 = new int[op.length * 2]; System.arraycopy(this.line, 0, line2, 0, op.length); this.line = line2;
89 Object[] arg2 = new Object[op.length * 2]; System.arraycopy(arg, 0, arg2, 0, arg.length); arg = arg2;
90 int[] op2 = new int[op.length * 2]; System.arraycopy(op, 0, op2, 0, op.length); op = op2;
92 this.line[size] = line;
100 // Invoking the Bytecode ///////////////////////////////////////////////////////
103 void eval(JS.Scope s) {
104 final JS.Thread cx = JS.Thread.fromJavaThread(java.lang.Thread.currentThread());
105 final Vec t = cx.stack;
106 OUTER: for(pc=0; pc<size; pc++) {
110 case LITERAL: t.push(arg[pc]); break;
111 case OBJECT: t.push(new JS.Obj()); break;
112 case ARRAY: t.push(new JS.Array(JS.toNumber(arg[pc]).intValue())); break;
113 case DECLARE: s.declare((String)t.pop()); break;
114 case TOPSCOPE: t.push(s); break;
115 case JT: if (JS.toBoolean(t.pop())) pc += JS.toNumber(arg[pc]).intValue() - 1; break;
116 case JF: if (!JS.toBoolean(t.pop())) pc += JS.toNumber(arg[pc]).intValue() - 1; break;
117 case JMP: pc += JS.toNumber(arg[pc]).intValue() - 1; break;
118 case POP: t.pop(); break;
119 case SWAP: { Object o1 = t.pop(); Object o2 = t.pop(); t.push(o1); t.push(o2); break; }
120 case DUP: t.push(t.peek()); break;
121 case NEWSCOPE: /*s = new JS.Scope(s);*/ break;
122 case OLDSCOPE: /*s = s.getParentScope();*/ break;
123 case ASSERT: if (!JS.toBoolean(t.pop())) throw je("assertion failed"); break;
124 case BITNOT: t.push(new Long(~JS.toLong(t.pop()))); break;
125 case BANG: t.push(new Boolean(!JS.toBoolean(t.pop()))); break;
129 if (o == null) t.push(null);
130 else if (o instanceof org.xwt.Box) t.push("Box");
131 else if (o instanceof JS) t.push("Object");
132 else if (o instanceof String) t.push("String");
133 else if (o instanceof Number) t.push("Number");
134 else if (o.getClass().getName().startsWith("org.xwt.js.")) t.push(o.getClass().getName().substring(11));
135 else t.push("unknown");
141 t.push(((CompiledFunctionImpl)arg[pc]).cloneWithNewParentScope(s));
142 } catch (IOException e) {
143 throw new Error("this should never happen");
150 Object[] keys = ((JS)o).keys();
151 JS.Array a = new JS.Array();
152 a.setSize(keys.length);
153 for(int j=0; j<keys.length; j++) a.setElementAt(keys[j], j);
161 t.push(new LoopMarker(pc, pc > 0 && op[pc - 1] == LABEL ? (String)arg[pc - 1] : (String)null));
162 t.push(Boolean.TRUE);
168 while(t.size() > 0) {
170 if (o instanceof CallMarker) ee("break or continue not within a loop");
171 if (o != null && o instanceof LoopMarker) {
172 if (arg[pc] == null || arg[pc].equals(((LoopMarker)o).label)) {
173 int loopInstructionLocation = ((LoopMarker)o).location;
174 int endOfLoop = ((Integer)arg[loopInstructionLocation]).intValue() + loopInstructionLocation;
175 s = (JS.Scope)t.pop();
176 if (op[pc] == CONTINUE) { t.push(s); t.push(o); t.push(Boolean.FALSE); }
177 pc = op[pc] == BREAK ? endOfLoop - 1 : loopInstructionLocation;
182 throw new Error("CONTINUE/BREAK invoked but couldn't find a LoopMarker at " + sourceName + ":" + line);
185 t.push(new TryMarker(pc + ((Integer)arg[pc]).intValue(), s));
190 Object retval = t.pop();
191 while(t.size() > 0) {
193 if (o != null && o instanceof CallMarker) {
198 throw new Error("error: RETURN invoked but couldn't find a CallMarker!");
202 Object val = t.pop();
203 Object key = t.pop();
204 Object target = t.peek();
206 throw je("tried to put a value to the " + key + " property on the null value");
207 if (!(target instanceof JS))
208 throw je("tried to put a value to the " + key + " property on a " + target.getClass().getName());
209 ((JS)target).put(key, val);
226 if (o == null) throw je("tried to get property \"" + v + "\" from the null value");
227 if (v == null) throw je("tried to get the null key from " + v);
228 if (o instanceof String) {
229 ret = getFromString((String)o, v);
230 } else if (o instanceof Boolean) {
231 throw je("Not Implemented: properties on Boolean objects");
232 } else if (o instanceof Number) {
233 Log.log(this, "Not Implemented: properties on Number objects");
234 } else if (o instanceof JS) {
235 ret = ((JS)o).get(v);
242 JS.Array arguments = new JS.Array();
243 int numArgs = JS.toNumber(arg[pc]).intValue();
244 arguments.setSize(numArgs);
245 for(int j=numArgs - 1; j >= 0; j--) arguments.setElementAt(t.pop(), j);
246 JS.Callable f = (JS.Callable)t.pop();
247 if (f == null) throw je("attempted to call null");
249 t.push(f.call(arguments));
255 // fall through if exception was thrown
257 Object exn = t.pop();
258 while(t.size() > 0) {
260 if (o instanceof TryMarker) {
262 pc = ((TryMarker)o).location - 1;
263 s = ((TryMarker)o).scope;
267 throw new JS.Exn(exn);
270 case INC: case DEC: {
271 boolean isPrefix = JS.toBoolean(arg[pc]);
272 Object key = t.pop();
273 JS obj = (JS)t.pop();
274 Number num = JS.toNumber(obj.get(key));
275 Number val = new Double(op[pc] == INC ? num.doubleValue() + 1.0 : num.doubleValue() - 1.0);
277 t.push(isPrefix ? val : num);
282 Object right = t.pop();
283 Object left = t.pop();
289 if (l instanceof String || r instanceof String) {
290 if (l == null) l = "null";
291 if (r == null) r = "null";
292 if (l instanceof Number && ((Number)l).doubleValue() == ((Number)l).longValue())
293 l = new Long(((Number)l).longValue());
294 if (r instanceof Number && ((Number)r).doubleValue() == ((Number)r).longValue())
295 r = new Long(((Number)r).longValue());
296 t.push(l.toString() + r.toString()); break;
298 t.push(new Double(JS.toDouble(l) + JS.toDouble(r))); break;
301 case BITOR: t.push(new Long(JS.toLong(left) | JS.toLong(right))); break;
302 case BITXOR: t.push(new Long(JS.toLong(left) ^ JS.toLong(right))); break;
303 case BITAND: t.push(new Long(JS.toLong(left) & JS.toLong(right))); break;
305 case SUB: t.push(new Double(JS.toDouble(left) - JS.toDouble(right))); break;
306 case MUL: t.push(new Double(JS.toDouble(left) * JS.toDouble(right))); break;
307 case DIV: t.push(new Double(JS.toDouble(left) / JS.toDouble(right))); break;
308 case MOD: t.push(new Double(JS.toDouble(left) % JS.toDouble(right))); break;
310 case LSH: t.push(new Long(JS.toLong(left) << JS.toLong(right))); break;
311 case RSH: t.push(new Long(JS.toLong(left) >> JS.toLong(right))); break;
312 case URSH: t.push(new Long(JS.toLong(left) >>> JS.toLong(right))); break;
314 case LT: case LE: case GT: case GE: {
315 if (left == null) left = new Integer(0);
316 if (right == null) right = new Integer(0);
318 if (left instanceof String || right instanceof String) {
319 result = left.toString().compareTo(right.toString());
321 result = (int)java.lang.Math.ceil(JS.toDouble(left) - JS.toDouble(right));
323 t.push(new Boolean((op[pc] == LT && result < 0) || (op[pc] == LE && result <= 0) ||
324 (op[pc] == GT && result > 0) || (op[pc] == GE && result >= 0)));
333 if (l == null) { Object tmp = r; r = l; l = tmp; }
334 if (l == null && r == null) ret = true;
335 else if (l instanceof Boolean) ret = new Boolean(JS.toBoolean(r)).equals(l);
336 else if (l instanceof Number) ret = JS.toNumber(r).doubleValue() == JS.toNumber(l).doubleValue();
337 else if (l instanceof String) ret = r != null && l.equals(r.toString());
338 else ret = l.equals(r);
339 t.push(new Boolean(op[pc] == EQ ? ret : !ret)); break;
342 default: throw new Error("unknown opcode " + op[pc]);
349 // Helpers for Number, String, and Boolean ////////////////////////////////////////
351 private Object getFromString(final String o, final Object v) {
352 if (v.equals("length")) return new Integer(((String)o).length());
353 else if (v.equals("substring")) return new JS.Callable() {
354 public Object call(JS.Array args) {
355 if (args.length() == 1) return ((String)o).substring(JS.toNumber(args.elementAt(0)).intValue());
356 else if (args.length() == 2) return ((String)o).substring(JS.toNumber(args.elementAt(0)).intValue(),
357 JS.toNumber(args.elementAt(1)).intValue());
358 else throw je("String.substring() can only take one or two arguments");
361 else if (v.equals("toLowerCase")) return new JS.Callable() {
362 public Object call(JS.Array args) {
363 return ((String)o).toLowerCase();
365 else if (v.equals("toUpperCase")) return new JS.Callable() {
366 public Object call(JS.Array args) {
367 return ((String)o).toString().toUpperCase();
369 else if (v.equals("charAt")) return new JS.Callable() {
370 public Object call(JS.Array args) {
371 return ((String)o).charAt(JS.toNumber(args.elementAt(0)).intValue()) + "";
373 else if (v.equals("lastIndexOf")) return new JS.Callable() {
374 public Object call(JS.Array args) {
375 if (args.length() != 1) return null;
376 return new Integer(((String)o).lastIndexOf(args.elementAt(0).toString()));
378 else if (v.equals("indexOf")) return new JS.Callable() {
379 public Object call(JS.Array args) {
380 if (args.length() != 1) return null;
381 return new Integer(((String)o).indexOf(args.elementAt(0).toString()));
383 throw je("Not Implemented: propery " + v + " on String objects");
387 // Exception Stuff ////////////////////////////////////////////////////////////////
389 static class EvaluatorException extends RuntimeException { public EvaluatorException(String s) { super(s); } }
390 EvaluatorException ee(String s) { throw new EvaluatorException(sourceName + ":" + line[pc] + " " + s); }
391 JS.Exn je(String s) { throw new JS.Exn(sourceName + ":" + line[pc] + " " + s); }
394 // FunctionScope /////////////////////////////////////////////////////////////////
396 private class FunctionScope extends JS.Scope {
398 public FunctionScope(String sourceName, Scope parentScope) { super(parentScope); this.sourceName = sourceName; }
399 public String getSourceName() { return sourceName; }
400 public Object get(Object key) throws JS.Exn {
401 if (key.equals("trapee")) return org.xwt.Trap.currentTrapee();
402 else if (key.equals("cascade")) return org.xwt.Trap.cascadeFunction;
403 return super.get(key);
408 // Markers //////////////////////////////////////////////////////////////////////
410 public static class CallMarker { public CallMarker() { } }
411 public static class LoopMarker {
414 public LoopMarker(int location, String label) {
415 this.location = location;
419 public static class TryMarker {
421 public JS.Scope scope;
422 public TryMarker(int location, JS.Scope scope) {
423 this.location = location;