[CEDET-devel] error: Method semantic-analyze-type-constraint called on nil

[Daniel C. <dcl...@ya...>]

  Hi.
  I follow an old thread where I sent some backtraces.

>
>    Same here. With the new code, I get the no-method-definition at some places (see below), but not where it was failing when I wrote the first message (e.g.: semanticdb-save-all-dbs).
>    Now I get it for instance if I do „F10 s a S“ (Senator smart completion dump) at the start of a file (e.g. Emacs' font.c):
>
> -------------
> Debugger entered--Lisp error: (no-method-definition semantic-analyze-type-constraint (nil))
>   signal(no-method-definition (semantic-analyze-type-constraint (nil)))
>   eieio-generic-call(semantic-analyze-type-constraint (nil))
>   semantic-analyze-type-constraint(nil)
>   semantic-analyze-possible-completions-default(nil)
>   semantic-analyze-possible-completions(218)
>   call-interactively(semantic-analyze-possible-completions)
> -------------
>

  If, with latest CEDET and Emacs, I open font.c (from Emacs) and press „F10 s a S“ (Senator smart completion dump), I get the following error:

Debugger entered--Lisp error: (error "Method semantic-analyze-type-constraint called on nil")
  signal(error ("Method semantic-analyze-type-constraint called on nil"))
  error("Method %s called on nil" semantic-analyze-type-constraint)
  eieio-generic-call-primary-only(semantic-analyze-type-constraint (nil))
  semantic-analyze-type-constraint(nil)
  semantic-analyze-possible-completions-default(nil)
  semantic-analyze-possible-completions(1)
  call-interactively(semantic-analyze-possible-completions)
  tmm-prompt(………………………………………………)
  tmm-prompt(……………………………)
  tmm-prompt(………………)
  tmm-menubar()
  x-menu-bar-open(nil)
  menu-bar-open()
  call-interactively(menu-bar-open nil nil)



  I saw that in semantic-analyze-complete.el, in the (define-overloadable-function semantic-analyze-possible-completions (context) … ), in following code:

  (with-syntax-table semantic-lex-syntax-table
    (let* ((context (if (semantic-analyze-context-child-p context)
                        context
                      (semantic-analyze-current-context context)))
	   (ans (:override)))

   … context is set to nil because the if fails and (semantic-analyze-current-context 1) is nil. If I eval this in the buffer, I also get nil.
  Other data:
- at position 1, (semantic-get-cache-data 'current-context) returns nil
- (semantic-analyze-current-context-default 1) → nil
- (semantic-ctxt-current-symbol-and-bounds 1) → (nil nil nil)
- ...

  Well, at this point I realized that that the problem is that I in position 1 of the buffer there was no symbol (and therefore no smart completion), just a comment:
/* font.c -- "Font" primitives.
   Copyright (C) 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
…

  In other places, „F10 s a S“ works: it displays some info.


  The error and the stack traces had confused me. Can we get a friendlier error message if there is no smart completion available? Like „no smart completion information available at this point“.



  Thanks,

Daniel