-// Copyright 2003 Adam Megacz, see the COPYING file for licensing [GPL]
+// Copyright 2004 Adam Megacz, see the COPYING file for licensing [GPL]
package org.xwt.js;
import org.xwt.util.*;
import java.io.*;
/** A JavaScript function, compiled into bytecode */
-public class JSFunction extends JSCallable implements ByteCodes, Tokens {
+class JSFunction extends JS implements ByteCodes, Tokens, org.xwt.Scheduler.Task {
// Fields and Accessors ///////////////////////////////////////////////
int numFormalArgs = 0; ///< the number of formal arguments
+
String sourceName; ///< the source code file that this block was drawn from
- int[] line = new int[10]; ///< the line numbers
private int firstLine = -1; ///< the first line of this script
+
+ int[] line = new int[10]; ///< the line numbers
int[] op = new int[10]; ///< the instructions
Object[] arg = new Object[10]; ///< the arguments to the instructions
int size = 0; ///< the number of instruction/argument pairs
- JSScope parentJSScope; ///< the default scope to use as a parent scope when executing this
+ JSScope parentScope; ///< the default scope to use as a parent scope when executing this
+
+
+ // Public //////////////////////////////////////////////////////////////////////////////
+
+ // FEATURE: make sure that this can only be called from the Scheduler...
+ /** if you enqueue a function, it gets invoked in its own pauseable context */
+ public void perform() throws JSExn {
+ Interpreter i = new Interpreter(this, true, new JSArray());
+ int oldpausecount = i.pausecount;
+ i.resume();
+ }
- // Constructors ////////////////////////////////////////////////////////
+ /** parse and compile a function */
+ public static JSFunction _fromReader(String sourceName, int firstLine, Reader sourceCode) throws IOException {
+ JSFunction ret = new JSFunction(sourceName, firstLine, null);
+ if (sourceCode == null) return ret;
+ Parser p = new Parser(sourceCode, sourceName, firstLine);
+ while(true) {
+ int s = ret.size;
+ p.parseStatement(ret, null);
+ if (s == ret.size) break;
+ }
+ ret.add(-1, LITERAL, null);
+ ret.add(-1, RETURN);
+ return ret;
+ }
- public JSFunction cloneWithNewParentJSScope(JSScope s) {
+ public JSFunction _cloneWithNewParentScope(JSScope s) {
JSFunction ret = new JSFunction(sourceName, firstLine, s);
// 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
return ret;
}
- JSFunction(String sourceName, int firstLine, JSScope parentJSScope) {
- this.sourceName = sourceName;
- this.firstLine = firstLine;
- this.parentJSScope = parentJSScope;
- }
-
- protected JSFunction(String sourceName, int firstLine, Reader sourceCode, JSScope parentJSScope) throws IOException {
- this(sourceName, firstLine, parentJSScope);
- if (sourceCode == null) return;
- Parser p = new Parser(sourceCode, sourceName, firstLine);
- while(true) {
- int s = size;
- p.parseStatement(this, null);
- if (s == size) break;
- }
- add(-1, LITERAL, null);
- add(-1, RETURN);
- }
-
/** Note: code gets run in an <i>unpauseable</i> context. */
- public Object call(Object a0, Object a1, Object a2, Object[] rest, int nargs) {
- JSContext cx = new JSContext(this, false);
+ public Object call(Object a0, Object a1, Object a2, Object[] rest, int nargs) throws JSExn {
JSArray args = new JSArray();
if (nargs > 0) args.addElement(a0);
if (nargs > 1) args.addElement(a1);
if (nargs > 2) args.addElement(a2);
for(int i=3; i<nargs; i++) args.addElement(rest[i-3]);
- cx.invoke(args);
- return cx.stack.pop();
+ Interpreter cx = new Interpreter(this, false, args);
+ return cx.resume();
}
+ public JSScope getParentScope() { return parentScope; }
// Adding and Altering Bytecodes ///////////////////////////////////////////////////
+ JSFunction(String sourceName, int firstLine, JSScope parentScope) {
+ this.sourceName = sourceName;
+ this.firstLine = firstLine;
+ this.parentScope = parentScope;
+ }
+
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_; }
// Debugging //////////////////////////////////////////////////////////////////////
public String toString() { return "JSFunction [" + sourceName + ":" + firstLine + "]"; }
+
public String dump() {
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]]);
+ 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) {