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Re: [Rhino in Java] compiling .js to class file gives "bad local" error
Date:
Wed, 31 Jan 2001 09:41:45 +0100
From:
"Sylvia E. Schleutermann" <ses@h-m-s.com>
Organization:
.hms Health Management Systems
Newsgroups:
netscape.public.mozilla.jseng
References:
1 , 2
I have found out some more. Looking really quickly over the JVM specs, I
found that
indeed the astore-command requires that the variables index be below 128.
However,
the book also said that if more index space is needed, a "wide" command can
be used to
be able to address up to 65xxx variables.
Question: is there a possibility to integrate this "wide"-command into the
class compiler?
Some option, that can be set? Or am I on the wrong tracks?
Please help, since I want to avoid spreading the script over many classes to
avoid the
size limitation. Cheers, Sylvia
Sylvia E. Schleutermann <ses@h-m-s.com> wrote in message
news:956sv9$9g53@secnews.netscape.com...
> I have found out that it is definitely the number of variables.
> I removed all variables and then the script compiled into class files
> with one base class and inner classes for each function in the script.
>
> What is the limitation exactly, i.e. does anyone know how many (global)
> variables
> I can use? Or is there some other kind of work around?
>
> Cheers, Sylvia
>
>
> Sylvia E. Schleutermann <ses@h-m-s.com> wrote in message
> news:956qtv$6kh3@secnews.netscape.com...
> > Hello,
> > when compiling a *.js file to class file, I get a "bad local" runtime
> > exception.
> > Stepping through the source, the following happens in reverse order:
> >
> > Codegen.xstore (75, 58, 209)
> > -> in the switch - default case, there is a comparison
> > for local (=209), which is compared to Byte.MAX_VALUE (=127).
> > When greater, the above exception is thrown.
> >
> > Codegen.astore (209)
> > -> calls Codegen.xstore (ByteCode.ASTORE_0, ByteCode.ASTORE, 209)
> >
> > Codegen.generatePrologue (<context>, <tree>, true, -1) // -1 is
> > directParameterCount
> > -> sets itsZeroArgArray = getNewWordLocal(); // here, the 209 is
> > produced
> > -> calls astore (itsZeroArgArray)
> >
> > From what I can read from the source code, the 209 seems to be a counter
> for
> > "locals", perhaps
> > local variables?? The function that is being compiled does initialize
many
> > variables - would it help
> > to move the initialize code out of the function into separate code
blocks?
> >
> > The function looks like this
> >
> > function rule_Disclaimer()
> > {
> > try { VAR1 = <init code 1>;} catch (exception) { VAR1 = <default
init
> > code 1>; }
> > try { VAR2 = <init code 2>;} catch (exception) { VAR2 = <default
init
> > code 2>;}
> > ... (about 58 such variables)
> >
> > var cond = true;
> >
> > < rest of code>
> > }
> >
> > When I compile the script for interpreted mode, all works well. The
> > variables VAR1 to VAR58 are to be global
> > variables (global to the whole script).
> >
> > I appreciate any help! Thanks, Sylvia
> >
> >
>
>
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| .. | ||
| examples | ||
| macbuild | ||
| org/mozilla | ||
| src/org/mozilla | ||
| toolsrc/org/mozilla/javascript/tools | ||
| Makefile | ||
| README.html | ||
| apiClasses.properties | ||
| build.xml | ||
| built-on-date | ||
| manifest | ||
README.html
<html> <!-- - The contents of this file are subject to the Netscape Public - License Version 1.1 (the "License"); you may not use this file - except in compliance with the License. You may obtain a copy of - the License at http://www.mozilla.org/NPL/ - - Software distributed under the License is distributed on an "AS - IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or - implied. See the License for the specific language governing - rights and limitations under the License. - - The Original Code is Rhino code, released - May 6, 1999. - - The Initial Developer of the Original Code is Netscape - Communications Corporation. Portions created by Netscape are - Copyright (C) 1998-1999 Netscape Communications Corporation. All - Rights Reserved. - - Contributor(s): - Norris Boyd - - Alternatively, the contents of this file may be used under the - terms of the GNU Public License (the "GPL"), in which case the - provisions of the GPL are applicable instead of those above. - If you wish to allow use of your version of this file only - under the terms of the GPL and not to allow others to use your - version of this file under the NPL, indicate your decision by - deleting the provisions above and replace them with the notice - and other provisions required by the GPL. If you do not delete - the provisions above, a recipient may use your version of this - file under either the NPL or the GPL. --> <body> <h1> <span CLASS=LXRSHORTDESC> Rhino: JavaScript in Java<p> </span> </h1> <span CLASS=LXRLONGDESC> Rhino is an implementation of JavaScript in Java. Documentation can be found <a href="http://www.mozilla.org/js/rhino/rhino.html">here</a>. </span> </body> </html>