Re: jsdIStackFrame.pc semantics

Ok now I am starting over.  I realize this may all be too complicated to 
sort out.

Here is my new example, a .js file:
---
var dynamic = "var m = 'm';\nvar a;\na = 1 + 2;\na += b;  // line 4";
function first() {
	dump("enter first\n");
	second();  // line 4
	var x1  = 1;
	var y1 = 1;
	var z1 = x1 + y1;
	return z1;
}
function second() {
	dump("enter second\n");
	eval(dynamic);  // line 12
	var x2  = 1;
	var y2 = 1;
	var z2 = x2 + y2;
	return z2;
}
---
I call first() in window.onload.  Here is my stack trace, the format is
Each frame:
<this>.<function>() baseline-extent@pcToLine: line[pcToLine - 2]
where all these values are from frame.script.
Each source line:
(lineToPC)line: lines[line]
where the lines array is from frame.script.functionSource.split('\n');
When I see a line number equal to delta baseline +1 I print >
When I print > and the line contains "eval", I print a line =-=-=
When I see a line number equal to pcToLine I print !

Things to notice:
   1) line[pcToLine - 2] correctly identifies the call except in eval; in
that case its off by one.
   2) line[pcToLine - 1] is too high by one except in eval body ('!' 
lines). (lines is zero based so lines[pcToLine - 1] is the line numbered
pcToline.
   3) The difference in base lines ('>') identifies the eval. (BTW also 
true for nested eval).
   4) The lineToPc gives zero if the line is before the call point.


---
FireclipseErrorReporter.dumpStack: PRETTYPRINT
Window.second() 12-4@4:     a = 3;
(0)1:    var m = "m";
(3)2:    var a;
(20)3:    a = 3;
(30)!:    a += b;
(30)5:
Window.second() 10-7@4:         eval(dynamic);
(0)1:    function second() {
(0)2:        dump("enter second\n");
(0)>:        eval(dynamic);
=-=-= eval =-=-=
(11)!:        var x2 = 1;
(22)5:        var y2 = 1;
(27)6:        var z2 = x2 + y2;
(32)7:        return z2;
(43)8:    }
Window.first() 2-7@4:         second();
(0)1:    function first() {
(0)2:        dump("enter first\n");
(0)3:        second();
(11)!:        var x1 = 1;
(19)5:        var y1 = 1;
(24)6:        var z1 = x1 + y1;
(29)7:        return z1;
(40)8:    }
---