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f4ca107f7f
* libguile/exceptions.c:
* libguile/exceptions.h: New files.
* libguile.h: Add exceptions.h.
* libguile/Makefile.am (libguile_@GUILE_EFFECTIVE_VERSION@_la_SOURCES):
(DOT_X_FILES, DOT_DOC_FILES, modinclude_HEADERS): Add exceptions.c and
exceptions.h.
* libguile/init.c (scm_i_init_guile): Initialize exceptions.
* libguile/threads.c (scm_spawn_thread): Use new names for
scm_i_make_catch_handler and scm_c_make_thunk.
* libguile/throw.c: Rewrite to be implemented in terms of
with-exception-handler / raise-exception.
* libguile/throw.h: Use data types from exceptions.h. Move
scm_report_stack_overflow and scm_report_out_of_memory to
exceptions.[ch].
* module/ice-9/boot-9.scm (&error, &programming-error)
(&non-continuable, make-exception-from-throw, raise-exception)
(with-exception-handler): New top-level definitions.
(throw, catch, with-throw-handler): Rewrite in terms of
with-exception-handler and raise-exception.
: New top-level definitions.
* module/ice-9/exceptions.scm: Adapt to re-export &error,
&programming-error, &non-continuable, raise-exception, and
with-exception-handler from boot-9.
(make-quit-exception, guile-quit-exception-converter): New exception
converters.
(make-exception-from-throw): Override core binding.
* test-suite/tests/eval.test ("inner trim with prompt tag"): Adapt to
"with-exception-handler" being the procedure on the stack.
("outer trim with prompt tag"): Likewise.
* test-suite/tests/exceptions.test (throw-test): Use pass-if-equal.
* module/srfi/srfi-34.scm: Reimplement in terms of core exceptions, and
make "guard" actually re-raise continuations with the original "raise"
continuation.
394 lines
9.8 KiB
Scheme
394 lines
9.8 KiB
Scheme
;;;; exceptions.test --- tests for Guile's exception handling -*- scheme -*-
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;;;; Copyright (C) 2001, 2003, 2004, 2006, 2010 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 3 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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(define-module (test-suite exceptions)
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#:use-module (test-suite lib))
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(define-syntax-parameter push
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(lambda (stx)
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(syntax-violation 'push "push used outside of throw-test" stx)))
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(define-syntax-rule (throw-test title result expr ...)
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(pass-if-equal title result
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(let ((stack '()))
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(syntax-parameterize ((push (syntax-rules ()
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((push val)
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(set! stack (cons val stack))))))
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expr ...
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;;(format #t "~a: ~s~%" title (reverse stack))
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(reverse stack)))))
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(with-test-prefix "throw/catch"
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(with-test-prefix "wrong type argument"
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(pass-if-exception "(throw 1)"
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exception:wrong-type-arg
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(throw 1)))
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(with-test-prefix "wrong number of arguments"
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(pass-if-exception "(throw)"
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exception:wrong-num-args
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(throw))
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(pass-if-exception "throw 1 / catch 0"
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exception:wrong-num-args
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(catch 'a
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(lambda () (throw 'a))
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(lambda () #f)))
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(pass-if-exception "throw 2 / catch 1"
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exception:wrong-num-args
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(catch 'a
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(lambda () (throw 'a 2))
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(lambda (x) #f)))
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(pass-if-exception "throw 1 / catch 2"
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exception:wrong-num-args
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(catch 'a
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(lambda () (throw 'a))
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(lambda (x y) #f)))
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(pass-if-exception "throw 3 / catch 2"
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exception:wrong-num-args
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(catch 'a
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(lambda () (throw 'a 2 3))
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(lambda (y x) #f)))
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(pass-if-exception "throw 1 / catch 2+"
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exception:wrong-num-args
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(catch 'a
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(lambda () (throw 'a))
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(lambda (x y . rest) #f))))
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(with-test-prefix "with pre-unwind handler"
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(pass-if "pre-unwind fluid state"
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(equal? '(inner outer arg)
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(let ((fluid-parm (make-fluid))
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(inner-val #f))
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(fluid-set! fluid-parm 'outer)
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(catch 'misc-exc
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(lambda ()
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(with-fluids ((fluid-parm 'inner))
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(throw 'misc-exc 'arg)))
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(lambda (key . args)
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(list inner-val
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(fluid-ref fluid-parm)
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(car args)))
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(lambda (key . args)
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(set! inner-val (fluid-ref fluid-parm))))))))
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(throw-test "normal catch"
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'(1 2)
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(catch 'a
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(lambda ()
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(push 1)
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(throw 'a))
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(lambda (key . args)
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(push 2))))
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(throw-test "catch and with-throw-handler"
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'(1 2 3 4)
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(catch 'a
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(lambda ()
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(push 1)
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(with-throw-handler
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'a
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(lambda ()
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(push 2)
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(throw 'a))
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(lambda (key . args)
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(push 3))))
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(lambda (key . args)
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(push 4))))
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(throw-test "catch with rethrowing throw-handler"
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'(1 2 3 4)
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(catch 'a
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(lambda ()
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(push 1)
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(with-throw-handler
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'a
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(lambda ()
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(push 2)
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(throw 'a))
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(lambda (key . args)
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(push 3)
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(apply throw key args))))
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(lambda (key . args)
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(push 4))))
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(throw-test "catch with pre-unwind handler"
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'(1 3 2)
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(catch 'a
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(lambda ()
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(push 1)
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(throw 'a))
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(lambda (key . args)
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(push 2))
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(lambda (key . args)
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(push 3))))
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(throw-test "catch with rethrowing pre-unwind handler"
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'(1 3 2)
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(catch 'a
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(lambda ()
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(push 1)
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(throw 'a))
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(lambda (key . args)
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(push 2))
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(lambda (key . args)
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(push 3)
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(apply throw key args))))
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(throw-test "catch with throw handler"
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'(1 2 3 4)
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(catch 'a
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(lambda ()
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(push 1)
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(with-throw-handler 'a
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(lambda ()
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(push 2)
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(throw 'a))
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(lambda (key . args)
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(push 3))))
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(lambda (key . args)
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(push 4))))
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(throw-test "catch with rethrowing throw handler"
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'(1 2 3 4)
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(catch 'a
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(lambda ()
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(push 1)
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(with-throw-handler 'a
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(lambda ()
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(push 2)
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(throw 'a))
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(lambda (key . args)
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(push 3)
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(apply throw key args))))
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(lambda (key . args)
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(push 4))))
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(throw-test "effect of with-throw-handler not-unwinding on throw to another key"
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'(1 2 3 5 4 6)
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(catch 'a
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(lambda ()
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(push 1)
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(with-throw-handler 'b
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(lambda ()
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(push 2)
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(catch 'a
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(lambda ()
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(push 3)
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(throw 'b))
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(lambda (key . args)
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(push 4))))
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(lambda (key . args)
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(push 5)
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(throw 'a)))
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(push 6))
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(lambda (key . args)
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(push 7))))
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(throw-test "with-throw-handler chaining"
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'(1 2 3 4 6 8)
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(catch 'a
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(lambda ()
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(push 1)
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(with-throw-handler 'a
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(lambda ()
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(push 2)
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(with-throw-handler 'a
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(lambda ()
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(push 3)
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(throw 'a))
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(lambda (key . args)
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(push 4)))
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(push 5))
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(lambda (key . args)
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(push 6)))
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(push 7))
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(lambda (key . args)
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(push 8))))
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(throw-test "throw handlers throwing to each other recursively"
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'(1 2 3 4 8 6 10 12)
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(catch #t
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(lambda ()
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(push 1)
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(with-throw-handler 'a
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(lambda ()
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(push 2)
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(with-throw-handler 'b
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(lambda ()
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(push 3)
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(with-throw-handler 'c
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(lambda ()
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(push 4)
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(throw 'b)
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(push 5))
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(lambda (key . args)
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(push 6)
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(throw 'a)))
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(push 7))
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(lambda (key . args)
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(push 8)
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(throw 'c)))
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(push 9))
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(lambda (key . args)
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(push 10)
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(throw 'b)))
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(push 11))
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(lambda (key . args)
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(push 12))))
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(throw-test "throw handler throwing to lexically inside catch"
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'(1 2 7 5 4 6 9)
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(with-throw-handler 'a
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(lambda ()
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(push 1)
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(catch 'b
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(lambda ()
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(push 2)
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(throw 'a)
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(push 3))
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(lambda (key . args)
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(push 4))
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(lambda (key . args)
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(push 5)))
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(push 6))
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(lambda (key . args)
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(push 7)
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(throw 'b)
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(push 8)))
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(push 9))
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(throw-test "reuse of same throw handler after lexically inside catch"
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'(0 1 2 7 5 4 6 7 10)
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(catch 'b
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(lambda ()
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(push 0)
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(with-throw-handler 'a
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(lambda ()
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(push 1)
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(catch 'b
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(lambda ()
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(push 2)
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(throw 'a)
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(push 3))
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(lambda (key . args)
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(push 4))
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(lambda (key . args)
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(push 5)))
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(push 6)
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(throw 'a))
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(lambda (key . args)
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(push 7)
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(throw 'b)
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(push 8)))
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(push 9))
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(lambda (key . args)
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(push 10))))
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(throw-test "again but with two chained throw handlers"
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'(0 1 11 2 13 7 5 4 12 13 7 10)
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(catch 'b
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(lambda ()
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(push 0)
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(with-throw-handler 'a
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(lambda ()
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(push 1)
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(with-throw-handler 'a
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(lambda ()
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(push 11)
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(catch 'b
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(lambda ()
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(push 2)
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(throw 'a)
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(push 3))
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(lambda (key . args)
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(push 4))
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(lambda (key . args)
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(push 5)))
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(push 12)
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(throw 'a))
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(lambda (key . args)
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(push 13)))
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(push 6))
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(lambda (key . args)
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(push 7)
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(throw 'b)))
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(push 9))
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(lambda (key . args)
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(push 10))))
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)
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(with-test-prefix "false-if-exception"
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(pass-if (false-if-exception #t))
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(pass-if (not (false-if-exception #f)))
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(pass-if (not (false-if-exception (error "xxx"))))
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;; Not yet working.
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;;
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;; (with-test-prefix "in empty environment"
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;; ;; an environment with no bindings at all
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;; (define empty-environment
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;; (make-module 1))
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;;
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;; (pass-if "#t"
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;; (eval `(,false-if-exception #t)
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;; empty-environment))
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;; (pass-if "#f"
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;; (not (eval `(,false-if-exception #f)
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;; empty-environment)))
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;; (pass-if "exception"
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;; (not (eval `(,false-if-exception (,error "xxx"))
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;; empty-environment))))
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)
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(with-test-prefix "delimited exception handlers"
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(define (catch* key thunk)
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(let ((tag (make-prompt-tag)))
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(call-with-prompt tag
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(lambda ()
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(catch key
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(lambda ()
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(abort-to-prompt tag)
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(thunk))
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(lambda args args)))
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(lambda (k) k))))
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(pass-if-equal '(foo)
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(let ((thunk (catch* 'foo (lambda () (throw 'foo)))))
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(thunk)))
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(pass-if-equal '(foo)
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(let* ((thunk1 (catch* 'foo (lambda () (throw 'foo))))
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(thunk2 (catch* 'bar (lambda () (thunk1)))))
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(thunk1)))
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(pass-if-equal '(foo)
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(let* ((thunk1 (catch* 'foo (lambda () (throw 'foo))))
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(thunk2 (catch* 'bar (lambda () (thunk1)))))
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(thunk2)))
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(pass-if-equal '(bar)
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(let* ((thunk1 (catch* 'foo (lambda () (throw 'bar))))
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(thunk2 (catch* 'bar (lambda () (thunk1)))))
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(thunk2))))
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