- Limiting function recursion depth - 15 Updates
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- Throwing Exceptions Across DLL-Boundaries - 6 Updates
| Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk>: Mar 24 01:52PM Hi! I've just thought of another elegant use for thread_local: limiting recursion depth of recursive functions to avoid a stack fault if recursion is dynamic/user input dependent: namespace neolib { template <typename Tag, std::size_t MaxDepth = Tag::RecursionLimit> class recursion_limiter { public: struct too_deep : std::runtime_error { too_deep() : std::runtime_error(std::string{ "Maximum recursion depth for '" } + typeid(Tag).name() + "' exceeded") {} }; public: recursion_limiter() { if (++current_depth() > MaxDepth) throw too_deep(); } ~recursion_limiter() { --current_depth(); } private: static std::size_t& current_depth() { thread_local std::size_t tDepth; return tDepth; } }; } #define _limit_recursion_(a) neolib::recursion_limiter<a> _##a##_recursion_limiter_ Usage: class ed209 { public: static constexpr std::size_t RecursionLimit = 64u; public: void target_armed() { _limit_recursion_(ed209); target_armed(); } }; The need for such a device is predicated on the assumption that throwing an exception is more desirable than raising a stack fault (which is undefined behaviour). /Flibble -- "You won't burn in hell. But be nice anyway." – Ricky Gervais "I see Atheists are fighting and killing each other again, over who doesn't believe in any God the most. Oh, no..wait.. that never happens." – Ricky Gervais "Suppose it's all true, and you walk up to the pearly gates, and are confronted by God," Bryne asked on his show The Meaning of Life. "What will Stephen Fry say to him, her, or it?" "I'd say, bone cancer in children? What's that about?" Fry replied. "How dare you? How dare you create a world to which there is such misery that is not our fault. It's not right, it's utterly, utterly evil." "Why should I respect a capricious, mean-minded, stupid God who creates a world that is so full of injustice and pain. That's what I would say." |
| Bonita Montero <Bonita.Montero@gmail.com>: Mar 24 04:31PM +0100 You're dealing with problems that not exist. Stack-overflows almost never happen. The only case which might tigger a stack overflow realistically is a massively misuse of alloca(). But using alloca() is untypical for C++-programs. |
| scott@slp53.sl.home (Scott Lurndal): Mar 24 04:25PM >The need for such a device is predicated on the assumption that throwing >an exception is more desirable than raising a stack fault (which is >undefined behaviour). Your code is not re-entrant, however. May be a limitation for some usage (e.g. if the recursion invokes a leaf function via a function pointer or std::function). |
| Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk>: Mar 24 04:44PM On 24/03/2019 15:31, Bonita Montero wrote: > almost never happen. The only case which might tigger a stack > overflow realistically is a massively misuse of alloca(). But > using alloca() is untypical for C++-programs. Nonsense. /Flibble -- "You won't burn in hell. But be nice anyway." – Ricky Gervais "I see Atheists are fighting and killing each other again, over who doesn't believe in any God the most. Oh, no..wait.. that never happens." – Ricky Gervais "Suppose it's all true, and you walk up to the pearly gates, and are confronted by God," Bryne asked on his show The Meaning of Life. "What will Stephen Fry say to him, her, or it?" "I'd say, bone cancer in children? What's that about?" Fry replied. "How dare you? How dare you create a world to which there is such misery that is not our fault. It's not right, it's utterly, utterly evil." "Why should I respect a capricious, mean-minded, stupid God who creates a world that is so full of injustice and pain. That's what I would say." |
| Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk>: Mar 24 04:44PM On 24/03/2019 16:25, Scott Lurndal wrote: > Your code is not re-entrant, however. May be a limitation for some usage > (e.g. if the recursion invokes a leaf function via a function pointer or > std::function). Nonsense. /Flibble -- "You won't burn in hell. But be nice anyway." – Ricky Gervais "I see Atheists are fighting and killing each other again, over who doesn't believe in any God the most. Oh, no..wait.. that never happens." – Ricky Gervais "Suppose it's all true, and you walk up to the pearly gates, and are confronted by God," Bryne asked on his show The Meaning of Life. "What will Stephen Fry say to him, her, or it?" "I'd say, bone cancer in children? What's that about?" Fry replied. "How dare you? How dare you create a world to which there is such misery that is not our fault. It's not right, it's utterly, utterly evil." "Why should I respect a capricious, mean-minded, stupid God who creates a world that is so full of injustice and pain. That's what I would say." |
| Bonita Montero <Bonita.Montero@gmail.com>: Mar 24 05:45PM +0100 > Your code is not re-entrant, ... Why? thread_local is like static but for each thread with an individual isntance. |
| Bonita Montero <Bonita.Montero@gmail.com>: Mar 24 05:48PM +0100 >> overflow realistically is a massively misuse of alloca(). But >> using alloca() is untypical for C++-programs. > Nonsense. No, not nonsense. No one cares about stack-overflows at least in userspace. With Windows the default stacksize is one MB and with Linux its 2MB. No one does recursions that eat so much stack-size. |
| Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk>: Mar 24 04:52PM On 24/03/2019 16:48, Bonita Montero wrote: > No, not nonsense. No one cares about stack-overflows at least in > userspace. With Windows the default stacksize is one MB and with > Linux its 2MB. No one does recursions that eat so much stack-size. More nonsense. /Flibble -- "You won't burn in hell. But be nice anyway." – Ricky Gervais "I see Atheists are fighting and killing each other again, over who doesn't believe in any God the most. Oh, no..wait.. that never happens." – Ricky Gervais "Suppose it's all true, and you walk up to the pearly gates, and are confronted by God," Bryne asked on his show The Meaning of Life. "What will Stephen Fry say to him, her, or it?" "I'd say, bone cancer in children? What's that about?" Fry replied. "How dare you? How dare you create a world to which there is such misery that is not our fault. It's not right, it's utterly, utterly evil." "Why should I respect a capricious, mean-minded, stupid God who creates a world that is so full of injustice and pain. That's what I would say." |
| Bonita Montero <Bonita.Montero@gmail.com>: Mar 24 06:59PM +0100 I've read much code and I never have seen someone dealing with stack-overflows explicitly. Even in Java where you have a special StackOverflowError, I've never seen code that catches such an error (it's not an exception but an Error in Java). The best thing here is that you can't calculate the amout of stack that is allocated for a function in C++ in a way to estimate a maxi- mum recursion-depth as the amount of stack for each function call may vary depending on the compiler and the runtime-library. And even if you could, setting the maximul recursion-depth to a _compile-time_ tempalte-parameter would be silly. |
| Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk>: Mar 24 06:10PM On 24/03/2019 17:59, Bonita Montero wrote: > may vary depending on the compiler and the runtime-library. And > even if you could, setting the maximul recursion-depth to a > _compile-time_ tempalte-parameter would be silly. Yet more nonsense. /Flibble -- "You won't burn in hell. But be nice anyway." – Ricky Gervais "I see Atheists are fighting and killing each other again, over who doesn't believe in any God the most. Oh, no..wait.. that never happens." – Ricky Gervais "Suppose it's all true, and you walk up to the pearly gates, and are confronted by God," Bryne asked on his show The Meaning of Life. "What will Stephen Fry say to him, her, or it?" "I'd say, bone cancer in children? What's that about?" Fry replied. "How dare you? How dare you create a world to which there is such misery that is not our fault. It's not right, it's utterly, utterly evil." "Why should I respect a capricious, mean-minded, stupid God who creates a world that is so full of injustice and pain. That's what I would say." |
| Bonita Montero <Bonita.Montero@gmail.com>: Mar 24 07:12PM +0100 >> even if you could, setting the maximul recursion-depth to a >> _compile-time_ tempalte-parameter would be silly. > Yet more nonsense. Absolute no argumentation from you - impressing. |
| Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk>: Mar 24 06:15PM On 24/03/2019 18:12, Bonita Montero wrote: >>> _compile-time_ tempalte-parameter would be silly. >> Yet more nonsense. > Absolute no argumentation from you - impressing. And random assertions from you with no evidence to back them up. Assertions made without evidence can be dismissed without evidence which is what I have been doing. /Flibble -- "You won't burn in hell. But be nice anyway." – Ricky Gervais "I see Atheists are fighting and killing each other again, over who doesn't believe in any God the most. Oh, no..wait.. that never happens." – Ricky Gervais "Suppose it's all true, and you walk up to the pearly gates, and are confronted by God," Bryne asked on his show The Meaning of Life. "What will Stephen Fry say to him, her, or it?" "I'd say, bone cancer in children? What's that about?" Fry replied. "How dare you? How dare you create a world to which there is such misery that is not our fault. It's not right, it's utterly, utterly evil." "Why should I respect a capricious, mean-minded, stupid God who creates a world that is so full of injustice and pain. That's what I would say." |
| David Brown <david.brown@hesbynett.no>: Mar 24 10:02PM +0100 On 24/03/2019 16:31, Bonita Montero wrote: > almost never happen. The only case which might tigger a stack > overflow realistically is a massively misuse of alloca(). But > using alloca() is untypical for C++-programs. I don't know if Mr Flibble was thinking of such systems, but stack overflows are very much a real problem in small embedded systems. It is not uncommon to have stacks of a couple of KB - sometimes they are far, far smaller. And generally there is no hardware protection or detection in the case of stack overflows. I haven't looked much at the OP's code to see if it is suitable for such systems. |
| Paavo Helde <myfirstname@osa.pri.ee>: Mar 24 11:18PM +0200 On 24.03.2019 18:48, Bonita Montero wrote: > No, not nonsense. No one cares about stack-overflows at least in > userspace. With Windows the default stacksize is one MB and with > Linux its 2MB. No one does recursions that eat so much stack-size. No one does such recursion because it does not work in C++. Stack overflow is one of nastiest UB-s in C++. Instead, people take pains to rewrite recursive algorithms via loops and dynamic data structures on heap. In other news, nobody needs more than 640K of RAM. |
| Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk>: Mar 24 10:58PM On 24/03/2019 21:18, Paavo Helde wrote: > No one does such recursion because it does not work in C++. Stack overflow > is one of nastiest UB-s in C++. Instead, people take pains to rewrite > recursive algorithms via loops and dynamic data structures on heap. I assume you are joking based on what you write next because that is simply bullshit. > In other news, nobody needs more than 640K of RAM. /Flibble -- "You won't burn in hell. But be nice anyway." – Ricky Gervais "I see Atheists are fighting and killing each other again, over who doesn't believe in any God the most. Oh, no..wait.. that never happens." – Ricky Gervais "Suppose it's all true, and you walk up to the pearly gates, and are confronted by God," Bryne asked on his show The Meaning of Life. "What will Stephen Fry say to him, her, or it?" "I'd say, bone cancer in children? What's that about?" Fry replied. "How dare you? How dare you create a world to which there is such misery that is not our fault. It's not right, it's utterly, utterly evil." "Why should I respect a capricious, mean-minded, stupid God who creates a world that is so full of injustice and pain. That's what I would say." |
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PARTE DELLA FAMIGLIA MAFIOSA MEG-A-SSASSINA DEI CIMINNA, MANDAMENTO DI CACCAMO. ED E' STATO POSTO IN GOPPA AL FOGLIO, POI, IN QUANTO AMANTE OMOSESSUALE DI GIULIANO FERRARA. ABBIAMO ANCHE PARECCHIE FOTO A PROPOSITO ( NON PER NIENTE, IL SATANISTA PEDERASTA GIULIANO FERRARA, CONSIGLIA QUI, IL FARE SESSO RICCHIONESCO, CONTRO NATURA E PERVERTITO https://www.blitzquotidiano.it/politica-italiana/giuliano-ferrara-omosessualita-giochetto-consiglio-contro-natura-1483446/ ). STESSA COSA PER IL PARI PEDERASTA, GIA' FINITO 3 VOLTE IN GALERA: PAOLO BARRAI DI CRIMINALISSIMA CRYPTOLAB, CRIMINALISSIMA BITINCUBATOR, CRIMINALISSIMA EIDOO, CRIMINALISSIMA CRYPTOPOLIS, CRIMINALISSIMA BLOCKCHAIN INVEST, CRIMINALISSIMA BIGBIT E BIGBITGOLD, CRIMINALISSIMA WMO SAGL LUGANO, CRIMINALISSIMA WORLD MAN OPPORTUNITIES LUGANO, CRIMINALISSIMA WMO SA PANAMA, CRIMINALISSIMA BSI ITALIA SRL DI VIA SOCRATE 26 A MILANO, CRIMINALISSIMO BLOG MERCATO LIBERO ALIAS "MERDATO" LIBERO (SU CUI TROVATE TUTTO, QUI http://lists.spline.de/pipermail/fli4l_opt/2014-September/000727.html ). ED IL PARI PEDERASTA STEFANO BASSI DI TORINO E DE IL GRANDE BLUFF https://twitter.com/grandebluff https://it-it.facebook.com/stefano.bassi.758 TUTT'UNO CON LA NDRANGHETA E DA DECENNI. CINTURA FRA GLI ASSASSINI CALABRESI BASATI A TORINO: ADOLFO CREA E ALDO COSIMO CREA http://www.torinotoday.it/cronaca/operazione-big-bang-ndrangheta-torino-arresto-adolfo-aldo-cosimo-crea.html ED IL "FORSE GIA' CITATO", BEN NOTO SPAPPOLA MAGISTRATI ED ACCERTATISSIMO PEDOFILO SILVIO BERLUSCONI. https://www.linkiesta.it/it/article/2013/06/25/napolitano-non-nominare-senatore-a-vita-un-pedofilo/14626/ https://it-it.facebook.com/FALCONE-E-BORSELLINO-UCCISI-DA-BERLUSCONI-134602469910010/ 6 PER NON PARLARE DEL PARI PEDOFILO INCULA BAMBINI E MEGA RICICLA SOLDI MAFIOSI, SATANISTA PAZZO PAOLO CARDENÀ https://www.py.cz/pipermail/python/2017-September/013036.html ( IN QUESTA TERRIFICANTE FOTO, CON SUA SATANAZISTISSIMA FACCIA RIPRESA GIUSTO PRIMA DI UNA MESSA NERA EFFETTUATA A MACERATA, A CUI FECE SEGUITO LO STUPRO DI SEI BAMBINI, POI UCCISI PROPRIO DALL'ECONOMISTA PEDOFILO ED ASSASSINO PAOLO CARDENÀ, QUINDI FATTI A PEZZI ED IMBOSCATI IN TANTI BOSCHI DEL MACERATESE STESSO https://a.mytrend.it/authors/1385.jpg https://www.money.it/IMG/arton21812.jpg COME DA COTANTO DI QUESTI ARTICOLI https://www.corriereadriatico.it/marche/marche_ancona_bambini_penelope_kyenge_scomparsi-1055541.html https://www.cronachemaceratesi.it/2016/05/24/spariti-nel-nulla-nelle-marche-si-cercano-558-persone/811406/ ). RESIDENTE A PENNA SAN GIOVANNI (MACERATA), VIA UMBERTO I, NR 41 ( O ANCHE PEDOFILO INCULA BAMBINI E MEGA RICICLA SOLDI MAFIOSI PAOLO CARDENÀ RESIDENTE A FALERONE IN VIA POZZO 105: PENSATE CHE STO BASTARDO ASSASSINO E PEDERASTA DI PAOLO CARDENÀ HA DECISO DI ANDARE A VIVERE IN UNA VIA CHE SI CHIAMA VIA POZZO, PROPRIO "IN MEMORIA" DI TANTI BAMBINI CHE STUPRATO, UCCISO E BUTTATO IN POZZI QUA E LA, COME DALLO STESSO DETTO E MOLTE VOLTE). DI CRIMINALISSIMA CARDENÀ CONSULTING E CRIMINALISSIMA CARDENÀ AND PARTNERS DI VIA MONTESSORI 6 E 8 DI FALERONE (FM) - Tel: 0734.710786 E DI CRIMINALISSIMO BLOG VINCITORI E VINTI (CHE OVVIAMENTE SERVE A LAVARE CASH ASSASSINO, DI MAFIA, NDRANGHETA E CAMORRA http://www.anconatoday.it/cronaca/gratteri-nicaso-ndrangheta-fiumi-oro-marche-ancona.html https://www.cronachemaceratesi.it/2015/05/29/mafia-nelle-marche-nessuno-ne-parla-la-denuncia-di-ambra-ruggeri-e-negli-appalti-delle-grandi-opere/662071/ https://www.cronachemaceratesi.it/2017/09/07/tonnellate-di-droga-dal-mare-i-traffici-della-camorra-nelle-marche-e-larresto-di-andrea-reccia/1008382/ ) https://www.py.cz/pipermail/python/2017-September/013036.html UNITO IN CIO' AL PARI PEDOFILO STEFANO CARDENA' SEMPRE DI CRIMINALISSIMA CARDENÀ CONSULTING E CRIMINALISSIMA CARDENÀ AND PARTNERS DI FALERONE, VIA MONTESSORI 6 ED 8! https://pbs.twimg.com/profile_images/427506611897528320/m6uFCCda.jpeg 7 IL TUTTO PURE UNITISSIMO AL MEGA RICICLA SOLDI DI COSA NOSTRA E NDRANGHETA, ROCCO TRIPODI DI CRIMINALISSIMA HYPO TIROL BANK PARMA..E DI NAZISTA CASA POUND http://it.viadeo.com/it/profile/rocco.tripodi https://www.facebook.com/Rocco-Tripodi-1537588826544365/ PARTE DELLA NAZIGANG E' IN STRA PIENO IL BASTARDO FASCIORAZZISTA E MEGA RICICLA SOLDI MAFIOSI, GIACOMO ZUCCO DI CRIMINALISSIMA BLOCHAINLAB, CRIMINALISSIMA BHB NETWORK, CRIMINALISSIMA BLOCKCHAINLABIT E CRIMINALISSIMA BHB-BLOCKCHAINLAB (OLTRE CHE PRIMA MENZIONATI KU KLUK KLANISTI, NAZIRAZZISTI TEA PARTIES). https://www.youtube.com/channel/UCVDHAgnt5MKt7srlJ38Vn2A } TRATTASI DI ALTRO CIUCCIA CAZZI MORTI DI SILVIO BERLUSCONI, CON GRAVISSIMI PRECEDENTI PENALI ( QUI IN UN PROCESSO A PROPOSITO DI SOLITI BASTARDISSIMI CRIMINI DEL PEDOFILO SPAPPOLA MAGISTRATI SILVIO BERLUSCONI E SUA DIARREA CRIMINALISSIMA GUIDO PODESTA' https://www.radioradicale.it/scheda/397502/processo-a-guido-podesta-ed-altri-per-falso-ideologico?i=271737 ). CHE, PER LO STESSO PEGGIORE CRIMINALE IN CRAVATTA DI TUTTO IL MONDO E DI TUTTI I TEMPI, SILVIO BERLUSCONI, MEGA RICICLA SOLDI KILLER DI BEN 7 NDRINE BASATE NEL MILANESE. FRA CUI LA MEGA SANGUINARIA NDRINA DI SANTO PASQUALE MORABITO https://www.ilfattoquotidiano.it/2015/01/06/ndrangheta-milano-grandi-famiglie-legate-calabresi/1318389/ . COME DELL'EFFERATO KILLER CAMORRISTA SALVATORE POTENZA! https://milano.repubblica.it/cronaca/2017/04/03/news/camorra_milano_sequestrato_ristorante_donna_sophia-162086270/ DI STA TOPAIA MALAVITOSA FA PARTE IN STRA PIENO IL VERME CALABRESE TUTT'UNO CON LA NDRANGHETA, AFFILIATISSIMO A MEGA ASSASSINE NDRINE DI SINGEN ED ENGEN (D) |
| Bonita Montero <Bonita.Montero@gmail.com>: Mar 24 07:52AM +0100 Does anyone know how throwing exceptions across DLL-boundaries does work? If all objects would store a pointer to a virtual-method-table together with RTTI-information like objects which have virtual methods, identifying the species of a thrown object would be very easy. But in this case if we would have compiled two modules in two DLLs, the VMT- and RTTI-information would be distinct for two logically identic objects because there VMT- and RTTI-information would exist multiple times in memory. But classes for exceptions don't necessarily have to have virtual methods and thereby no VMT- and RTTI-informations. So I assume that when I throw an exception, the object thrown I throw would get handed along with an additional pointer to a kind of RTTI-information. But in this case we would have the same problem that with separately compiled DLLs this information might be distinct. So is there any way to mark a class external in a way that this RTTI-like information is stored only once in either DLL? |
| "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com>: Mar 24 08:14AM +0100 On 24.03.2019 07:52, Bonita Montero wrote: > Does anyone know how throwing exceptions across DLL-boundaries does > work? It /can/ work if everything's compiled by the same compiler that supports it. But I wouldn't rely on it. COM defines a scheme for return types that are translated to exceptions by the caller. I think that's the way to go. Think of a call across a DLL boundary as a sort of remote procedure call, with marshaling and unmarshaling of arguments, results and exceptions. > DLLs this information might be distinct. So is there any way to mark a > class external in a way that this RTTI-like information is stored only > once in either DLL? Cheers!, - Alf |
| Bonita Montero <Bonita.Montero@gmail.com>: Mar 24 09:01AM +0100 I just made a test-project with Visual Studio / VC++. I assumed that __declspec(dllimport) / __declspec(dllexport) could be attached to classes themselfes so that the meta-information passed alongside with a thrown object is stored only once and all references to this infor- mation refer to this single location. But unfortunally __declspec( dllimport) / __declspec(dllexport) could only be applied to objects themselfes and not classes. So this seems to be an imperfection of the C++-compilers which should be fixed. Maybe a platform-independent solution for this issue would be possible. |
| Marcel Mueller <news.5.maazl@spamgourmet.org>: Mar 24 09:34AM +0100 Am 24.03.19 um 07:52 schrieb Bonita Montero: > Does anyone know how throwing exceptions across DLL-boundaries does > work? It works if and only if all library modules are compiled with the same toolset, preferable in one build process to avoid minor differences, and if all of them share the same runtime library instance, i.e. no static linkage. > and RTTI-information would be distinct for two logically identic > objects because there VMT- and RTTI-information would exist multiple > times in memory. That's no big deal if they are identical. > along with an additional pointer to a kind of RTTI-information. But in > this case we would have the same problem that with separately compiled > DLLs this information might be distinct. If you violate the ODR everything could happen. > So is there any way to mark a > class external in a way that this RTTI-like information is stored only > once in either DLL? I have no idea how this is implemented, but it works. I already used this in late 90's. The only question that arises. When all DLL modules need to be from one build process, why are there separate modules at all? So throwing across DLL boundaries is of little use in most cases. Marcel |
| Bonita Montero <Bonita.Montero@gmail.com>: Mar 24 09:52AM +0100 No, I made a little mistake. It works, see here (VC++-2017-project): https://www112.zippyshare.com/v/pYhqhtAT/file.html But I don't know why this works. |
| Paavo Helde <myfirstname@osa.pri.ee>: Mar 24 01:54PM +0200 On 24.03.2019 10:34, Marcel Mueller wrote: > The only question that arises. When all DLL modules need to be from one > build process, why are there separate modules at all? One reason might be that the separate modules are used as optional plugins which are not always installed or loaded. Another is that a separate DLL might be needed for isolating an offending third-party library which would cause linker errors or runtime malfunctions if compiled directly into the main executable. A third potential cause is that a single DLL might just become too large to manage or too slow to recompile/relink. I'm sure there are more. |
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