Subj : Re: Exception in SpiderMonkey v1.6 pr 6a
To   : Rob Swindell
From : Brendan Eich
Date : Mon May 02 2005 11:14 am

Rob Swindell wrote:
> Here's a call-stack from a recent crash of a script using js32.dll
> (JavaScript-C 1.5 pre-release 6a 2004-06-09):
> 
> js_LookupPropertyWithFlags(JSContext * 0x00a32010, JSObject * 0x015a2cf8,
> long 0x01cbc3f0, unsigned int 0x00000000, JSObject * * 0x0012e39c,
> JSProperty * * 0x0012e318) line 2442 + 34 bytes
> js_LookupProperty(JSContext * 0x00a32010, JSObject * 0x015a2cf8, long
> 0x01cbc3f0, JSObject * * 0x0012e39c, JSProperty * * 0x0012e318) line 2417 +
> 27 bytes
> js_Interpret(JSContext * 0x00a32010, unsigned char * 0x015f2913, long *
> 0x0012e4ec) line 2426 + 43 bytes

In RC6a, this line is the starred one below:

                 str = js_ConcatStrings(cx, str, str2);
*               if (!str) {
                     ok = JS_FALSE;
                     goto out;
                 }


Have you hacked on jsinterp.c by any chance?


> js_Invoke(JSContext * 0x00a32010, unsigned int 0x00000001, unsigned int
> 0x00000000) line 1313 + 22 bytes
> js_Interpret(JSContext * 0x00a32010, unsigned char * 0x015aa75f, long *
> 0x0012f5b0) line 3566 + 15 bytes
> js_Execute(JSContext * 0x00a32010, JSObject * 0x010e93a8, JSScript *
> 0x016772c0, JSStackFrame * 0x00000000, unsigned int 0x00000000, long *
> 0x0012f6cc) line 1523 + 19 bytes
> JS_ExecuteScript(JSContext * 0x00a32010, JSObject * 0x010e93a8, JSScript *
> 0x016772c0, long * 0x0012f6cc) line 3630 + 25 bytes
> js_exec(const char * 0x00a50c21, char * * 0x00a50bd4) line 721 + 36 bytes
> main(int 0x0000000a, char * * 0x00a50bb0, char * * 0x00a50c58) line 976 + 25
> bytes
> mainCRTStartup() line 206 + 25 bytes
> KERNEL32! 7c59893d()
> 
> Line 2442 in jsobj.c is simple a call to this (rather extensive) macro:
> 
>     CHECK_FOR_FUNNY_INDEX(id);
> 
> Any clues as the cause/solution would be appreciate,


It's really impossible to say without accurate source line numbers 
referring to source I can check out, along with debugger information 
such as id's value in hex, memory it references, etc.  Find me on 
irc.mozilla.org #developers some time.

/be

> 
> -Rob
> 
>

.