Re: Difficulties byte-compiling very large .el file

[Andreas Schwab]

Aemon Cannon <address@hidden> writes:

> The generated parser for ActionScript 3 is over 30k lines long and
> fails to byte-compile with the message in Emacs 22:
> as3_elispParser.el:31515:33:Error: Invalid character: 256, #o400,
> #x100
>
> ..and this message in Emacs 23:
> ../test/grammars/as3_elispParser.el:31515:33:Error: Args out of range:
> 256, 0, 255

Probably the bytecode string is becoming too large so that a byte-goto
operand overflows.  Try this patch to verify:

--- lisp/emacs-lisp/bytecomp.el.~2.248.~        2009-08-06 13:15:39.000000000 
+0200
+++ lisp/emacs-lisp/bytecomp.el 2009-08-20 10:26:05.000000000 +0200
@@ -853,7 +853,8 @@ otherwise pop it")
              (t                        ; Absolute jump
               (setq pc (car (cdr (car bytes))))        ; Pick PC from tag
               (setcar (cdr bytes) (logand pc 255))
-              (setcar bytes (lsh pc -8))))
+              (setcar bytes (lsh pc -8))
+              (if (> (car bytes) 255) (error "Bytecode overflow"))))
        (setq patchlist (cdr patchlist))))
     (apply 'unibyte-string (nreverse bytes))))
 

Andreas.

-- 
Andreas Schwab, address@hidden
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