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* lisp/emacs-lisp/debug.el (debugger-args): Give it a docstring.

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(debugger-return-value): Signal an error if the debugging context does
not await any return value.
This commit is contained in:
Stefan Monnier 2011-09-19 17:14:23 -04:00
parent 345083b2cb
commit e24e27be18
2 changed files with 45 additions and 26 deletions
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4
lisp/ChangeLog
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@ -1,5 +1,9 @@
2011-09-19 Stefan Monnier <monnier@iro.umontreal.ca>
* emacs-lisp/debug.el (debugger-args): Give it a docstring.
(debugger-return-value): Signal an error if the debugging context does
not await any return value.
* ps-mule.el (ps-mule-plot-string): Don't inf-loop (bug#5108).
* image-mode.el (image-toggle-display-text)
(image-toggle-display-image): Stay away from evil `intangible'.

67
lisp/emacs-lisp/debug.el
View file

@ -98,6 +98,16 @@ and `debugger-reenable' to temporarily disable debug-on-entry.")
(defvar inhibit-trace) ;Not yet implemented.
(defvar debugger-args nil
"Arguments with which the debugger was called.
It is a list expected to take the form (CAUSE . REST)
where CAUSE can be:
- debug: called for entry to a flagged function.
- t: called because of debug-on-next-call.
- lambda: same thing but via `funcall'.
- exit: called because of exit of a flagged function.
- error: called because of `debug-on-error'.")
;;;###autoload
(setq debugger 'debug)
;;;###autoload
@ -296,32 +306,33 @@ That buffer should be current already."
(insert "Debugger entered")
;; lambda is for debug-on-call when a function call is next.
;; debug is for debug-on-entry function called.
(cond ((memq (car debugger-args) '(lambda debug))
(insert "--entering a function:\n"))
;; Exiting a function.
((eq (car debugger-args) 'exit)
(insert "--returning value: ")
(setq debugger-value (nth 1 debugger-args))
(prin1 debugger-value (current-buffer))
(insert ?\n)
(delete-char 1)
(insert ? )
(beginning-of-line))
;; Debugger entered for an error.
((eq (car debugger-args) 'error)
(insert "--Lisp error: ")
(prin1 (nth 1 debugger-args) (current-buffer))
(insert ?\n))
;; debug-on-call, when the next thing is an eval.
((eq (car debugger-args) t)
(insert "--beginning evaluation of function call form:\n"))
;; User calls debug directly.
(t
(insert ": ")
(prin1 (if (eq (car debugger-args) 'nil)
(cdr debugger-args) debugger-args)
(current-buffer))
(insert ?\n)))
(pcase (car debugger-args)
((or `lambda `debug)
(insert "--entering a function:\n"))
;; Exiting a function.
(`exit
(insert "--returning value: ")
(setq debugger-value (nth 1 debugger-args))
(prin1 debugger-value (current-buffer))
(insert ?\n)
(delete-char 1)
(insert ? )
(beginning-of-line))
;; Debugger entered for an error.
(`error
(insert "--Lisp error: ")
(prin1 (nth 1 debugger-args) (current-buffer))
(insert ?\n))
;; debug-on-call, when the next thing is an eval.
(`t
(insert "--beginning evaluation of function call form:\n"))
;; User calls debug directly.
(_
(insert ": ")
(prin1 (if (eq (car debugger-args) 'nil)
(cdr debugger-args) debugger-args)
(current-buffer))
(insert ?\n)))
;; After any frame that uses eval-buffer,
;; insert a line that states the buffer position it's reading at.
(save-excursion
@ -439,6 +450,10 @@ Enter another debugger on next entry to eval, apply or funcall."
This is only useful when the value returned from the debugger
will be used, such as in a debug on exit from a frame."
(interactive "XReturn value (evaluated): ")
(when (memq (car debugger-args) '(t lambda error debug))
(error "Cannot return a value %s"
(if (eq (car debugger-args) 'error)
"from an error" "at function entrance")))
(setq debugger-value val)
(princ "Returning " t)
(prin1 debugger-value)