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From: "ibrbulat at yandex dot ru" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/99858] New: Wrong throw-expression behaviour with reference to pointer Date: Wed, 31 Mar 2021 21:21:36 +0000 [thread overview] Message-ID: <bug-99858-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99858 Bug ID: 99858 Summary: Wrong throw-expression behaviour with reference to pointer Product: gcc Version: 10.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: ibrbulat at yandex dot ru Target Milestone: --- If you catch an exception of pointer type by reference to pointer, change the value of the pointer inside this catch block and then rethrow it via *throw* with no operand, compiler will create a copy of initial exception(!) and no changes will be seen in the next handler. Minimal example is here https://godbolt.org/z/T11939EYM This behavior is contrary to the C ++ language standard (e.g. C++17): [expr.throw]: "... 3. A throw-expression with no operand rethrows the currently handled exception (18.3). The exception is reactivated with the existing exception object; no new exception object is created. ..." [except.throw]: "... If a handler exits by rethrowing, control is passed to another handler for the same exception object. ..." However it works well with other (non-pointer) types - no additional copy is created, all handlers work with the same object and see each other changes (example: https://godbolt.org/z/Ea6r1z7rE)
next reply other threads:[~2021-03-31 21:21 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-03-31 21:21 ibrbulat at yandex dot ru [this message] 2021-04-01 7:38 ` [Bug c++/99858] " rguenth at gcc dot gnu.org 2021-04-01 10:50 ` redi at gcc dot gnu.org 2022-06-10 21:40 ` foom at fuhm dot net 2023-11-19 19:14 ` pinskia at gcc dot gnu.org
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