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1351c2dba5
* module/ice-9/boot-9.scm (default-pre-unwind-handler): Since we were tail-called by pre-unwind-handler-dispatch, we can't use pre-unwind-handler-dispatch as a narrowing argument. Instead just narrow by one frame. (pre-unwind-handler-dispatch): Deprecate. (error-catching-loop): Remove crack comment and code, and just use default-pre-unwind-handler as our pre-unwind handler. * module/ice-9/stack-catch.scm (stack-catch): * module/system/repl/repl.scm (call-with-backtrace): Use default-pre-unwind-handler directly.
43 lines
1.8 KiB
Scheme
43 lines
1.8 KiB
Scheme
;;; installed-scm-file
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;;;; Copyright (C) 2001, 2006 Free Software Foundation, Inc.
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;;;;
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;;;; This library is free software; you can redistribute it and/or
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;;;; modify it under the terms of the GNU Lesser General Public
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;;;; License as published by the Free Software Foundation; either
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;;;; version 2.1 of the License, or (at your option) any later version.
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;;;;
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;;;; This library is distributed in the hope that it will be useful,
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;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;;;; Lesser General Public License for more details.
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;;;;
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;;;; You should have received a copy of the GNU Lesser General Public
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;;;; License along with this library; if not, write to the Free Software
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;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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;;;;
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(define-module (ice-9 stack-catch)
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:export (stack-catch))
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(define (stack-catch key thunk handler)
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"Like @code{catch}, invoke @var{thunk} in the dynamic context of
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@var{handler} for exceptions matching @var{key}, but also save the
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current stack state in the @var{the-last-stack} fluid, for the purpose
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of debugging or re-throwing of an error. If thunk throws to the
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symbol @var{key}, then @var{handler} is invoked this way:\n
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@example
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(handler key args ...)
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@end example\n
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@var{key} is a symbol or #t.\n
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@var{thunk} takes no arguments. If @var{thunk} returns normally, that
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is the return value of @code{catch}.\n
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Handler is invoked outside the scope of its own @code{catch}. If
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@var{handler} again throws to the same key, a new handler from further
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up the call chain is invoked.\n
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If the key is @code{#t}, then a throw to @emph{any} symbol will match
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this call to @code{catch}."
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(catch key
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thunk
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handler
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default-pre-unwind-handler))
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