[slime-devel] Re: Automatic "semantic" indentation

[Luke Gorrie]

Bill_Clementson at peoplesoft.com writes:

> I downloaded the latest SLIME with the new macro indentation code from CVS.
> It seems to work under LW & CLISP on Windows; however, I get the following
> error under ACL on Windows:
>
> Received signal number 11 (Segmentation violation)
>    [Condition of type SYNCHRONOUS-OPERATING-SYSTEM-SIGNAL]

Jeepers. As a workaround you can set
swank:*configure-emacs-indentation* to NIL in ACL.

> Backtrace:
>   0: (SWANK::DEBUG-IN-EMACS #<SYNCHRONOUS-OPERATING-SYSTEM-SIGNAL @
> #x2064080a>)
>   1: ((FLET SWANK::SWANK-DEBUGGER-HOOK SWANK::DEBUG-IT))
>   2: (SWANK::SWANK-DEBUGGER-HOOK #<SYNCHRONOUS-OPERATING-SYSTEM-SIGNAL @
> #x2064080a> #<Function SWANK-DEBUGGER-HOOK>)
>   3: (EXCL::INTERNAL-INVOKE-DEBUGGER "Error"
> #<SYNCHRONOUS-OPERATING-SYSTEM-SIGNAL @ #x2064080a> T)
>   4: (ERROR SYNCHRONOUS-OPERATING-SYSTEM-SIGNAL :NAME #1="Segmentation
> violation" :NUMBER 11 :FORMAT-CONTROL "Received signal number ~s ~@[(~a)~]"
> :FORMAT-ARGUMENTS (11 #1#))
>   5: (EXCL::HANDLE-PENDING-SIGNAL 11)
>   6: (SYSTEM::..CONTEXT-SAVING-RUNTIME-OPERATION)
>   7: (EXCL::LIST-REMOVE-EQL &WHOLE ((COMPILER::VAR COMPILER::NEXT LIST) .
> COMPILER::BODY))
>   8: (SWANK::MACRO-INDENTATION ((COMPILER::VAR COMPILER::NEXT LIST) .
> COMPILER::BODY))

This is interesting. Do you get the same problem if you just directly
run this?

  (macro-indentation '((COMPILER::VAR COMPILER::NEXT LIST) . COMPILER::BODY))

>From the backtrace it looks like the error is triggered by:

  (remove '&whole '((COMPILER::VAR COMPILER::NEXT LIST) . COMPILER::BODY))

Which I imagine should generate an error because the list isn't
properly terminated, but a segfault seems a bit on the harsh side. Do
you have some kind of high-speed low-safety optimization setup?

Most importantly, is the return value of excl:arglist documented?
Hopefully we can patch it up in swank-allegro.lisp to return something
that looks like a proper lambda-list.

-Luke