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show args to subr calls in backtraces

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* module/system/vm/frame.scm (frame-arguments): For subrs, we don't get
  names in the lambda-list, we get #f instead. But still, parse out the
  args in that case, assuming they are on the stack in that order.
This commit is contained in:
Andy Wingo 2010-01-10 23:10:24 +01:00
parent cf8ec359cc
commit ecdf15573b
1 changed files with 11 additions and 6 deletions
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17
module/system/vm/frame.scm
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@ -1,6 +1,6 @@
;;; Guile VM frame functions
;;; Copyright (C) 2001, 2005, 2009 Free Software Foundation, Inc.
;;; Copyright (C) 2001, 2005, 2009, 2010 Free Software Foundation, Inc.
;;;
;;; This library is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU Lesser General Public
@ -74,16 +74,21 @@
(frame-instruction-pointer frame))
;; case 1
=> (lambda (formals)
(let lp ((formals formals))
(let lp ((formals formals) (i 0))
(pmatch formals
(() '())
((,x . ,rest) (guard (symbol? x))
(cons (frame-binding-ref frame x) (lp rest)))
((,x . ,rest)
;; could be a keyword
(cons x (lp rest)))
(cons (frame-binding-ref frame x) (lp rest (1+ i))))
((,x . ,rest) (guard (keyword? x))
(cons x (lp rest i)))
((,x . ,rest) (guard (not x) (< i (frame-num-locals frame)))
;; an arg, but we don't know the name. ref by index.
(cons (frame-local-ref frame i) (lp rest (1+ i))))
(,rest (guard (symbol? rest))
(frame-binding-ref frame rest))
(,rest (guard (not rest) (< i (frame-num-locals frame)))
;; again, no name.
(frame-local-ref frame i))
;; let's not error here, as we are called during
;; backtraces...
(else '???)))))