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<p class="MsoNormal"><span lang="EN-US">As far as I see:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">- a function calling only `noexcept` operations that does not throw can be marked noexcept<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">possible<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">- a function that has a `throw` statement not within a `try/catch` block can be marked noexcept(false)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Not possible<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">- a function calling a function that is not marked noexcept can not be marked noexcept<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> but it could be noexecpt with deeper analysis on what exception could be thrown and what exceptions are handled<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">not possible<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> cfe-dev [mailto:cfe-dev-bounces@lists.llvm.org]
<b>On Behalf Of </b>Jonas Toth via cfe-dev<br>
<b>Sent:</b> Thursday, March 16, 2017 10:08 AM<br>
<b>To:</b> via cfe-dev<br>
<b>Subject:</b> [cfe-dev] clang-tidy and static analysis for exception safety<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hello everybody,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I want to implement an check for proper exception specification (noexcept correctness). In code review aaron.ballman pointed out that there is path sensitive analysis necessary. Since i have no experience and knowledge on that I would like
to have some input from experienced programmers on that topic.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">What should be possible with AST - Matching in clang-tidy:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">- a function calling only `noexcept` operations that does not throw can be marked noexcept<o:p></o:p></p>
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<p class="MsoNormal">- a function that has a `throw` statement not within a `try/catch` block can be marked noexcept(false)<o:p></o:p></p>
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<p class="MsoNormal">- a function calling a function that is not marked noexcept can not be marked noexcept<o:p></o:p></p>
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<p class="MsoNormal"> but it could be noexecpt with deeper analysis on what exception could be thrown and what exceptions are handled<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Having logic for these cases would allow to automatically improve noexcept-correctness.<o:p></o:p></p>
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<p class="MsoNormal">Maybe more importantly it would be possible to find destructors and deallocation functions that could throw but never should.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Is there already functionality for such analysis, is my model even correct and how hard would the analysis be?<o:p></o:p></p>
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<p class="MsoNormal">I have no experience in CSA development but iam fairly interested in it and would like to learn if reasonably complicated.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">All the best<o:p></o:p></p>
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<p class="MsoNormal">Jonas<o:p></o:p></p>
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