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github.com/moarvm/moarvm | IRC logs at colabti.org/irclogger/irclogger_logs/moarvm Set by AlexDaniel on 12 June 2018. |
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| Geth | MoarVM: Kaiepi++ created pull request #1001: Include system library paths in Configure.pl if configured to use them |
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| samcv | Kaiepi, reviewed your PR | 05:40 | |
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| brrt | ohai #moarvm | 17:43 | |
| yoleaux | 23 Nov 2018 19:18Z <nine> brrt: I sure hope I can help :) | ||
| brrt | I can't seem to find the concentration to actually get to work on it :-( | 17:44 | |
| (it being, the implementation of nativecallinvoke in the expr jit, especially testing that it is correct) | |||
| lucasb | is there any way to segfault moarvm on purpose from Perl 6 code? | 17:49 | |
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| lucasb | and if there isn't, can't one exist? | 17:50 | |
| I remember seeing this "feature" in some environment/language | 17:51 | ||
| japhb | lucasb: Do you want to *actually* segfault, or do you just want to send it sig 11 or so? | 17:52 | |
| lucasb | just for the purposes of learning what a legit segfault looks like in a debubging tool | ||
| japhb | Oh, I see. | ||
| brrt | write a C program, you'll get one | ||
| lucasb | oh, then bind it with Nativecall? | ||
| brrt | I'm not sure why you want to hurt moarvm so much | ||
| japhb | lucasb: Yeah, it shouldn't be hard to do it with nativecall | ||
| brrt | :-P | 17:53 | |
| japhb | brrt: He wants to learn how to debug a segfault. | ||
| lucasb | I don't want a standalone C program, I want to segfault from within Perl 6 code | ||
| japhb | So cause one and look at the crash in a debugger | ||
| brrt | hehe | ||
| well, i'll make one for you, no problem | |||
| lucasb | brrt: you will? :-) | ||
| brrt | just wait, they'll pop up soon enough | 17:55 | |
| but we try not to have segfaults. I'm not sure we're right about that, but that's what we do | |||
| lucasb | you are not sure moarvm should have *no* segfaults? (Just trying to learn/understand :-) | 17:57 | |
| brrt | well, something like java will not emit checks for null pointers, but translate a segmentation vialotion to a null pointer to a NullPointerException | 18:00 | |
| that makes the code quite a bit smaller for the common case that a pointer is indeed not null | |||
| there's another school of thought that says all UB is a safety problem. I'm not so sure what my position on that is | 18:02 | ||
| lucasb | but a NullPointerException is "catchable", right? (dunno Java) | ||
| brrt | yes | ||
| but that's not a problem. | |||
| when a SEGV is raised, and it happens to be caused by access of a null pointer, it is really not all that hard to write a signal handler to catch it and translate to a catchable exception | 18:03 | ||
| I forgot which signals could not be caught, but SIGSEGV is not one of them | 18:04 | ||
| lucasb | ah, I remembered where I've seen it: Redis! | 18:05 | |
| redis.io/commands/debug-segfault | |||
| DEBUG SEGFAULT performs an invalid memory access that crashes Redis. It is used to simulate bugs during the development. | |||
| I think this could be useful, can I haz it in moarvm? | |||
| brrt | 'no' | 18:07 | |
| timotimo | easy to build a module that does it | 18:08 | |
| brrt | :-P | ||
| lucasb | hehe, ok. I'll push this project into my todo list :) | 18:09 | |
| timotimo | it'll be two lines | 18:11 | |
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| Geth | MoarVM: c0799ec146 | (Ben Davies)++ | Configure.pl Include system library paths in Configure.pl if configured to use them Fixes #1000 |
19:48 | |
| MoarVM: 6307866af8 | (Samantha McVey)++ (committed using GitHub Web editor) | Configure.pl Merge pull request #1001 from Kaiepi/configure2 Include system library paths in Configure.pl if configured to use them |
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| lucasb | What was "s/\n/ /g" before, became "s/\n//g", but maybe pkg-config never outputs more than one line, so probably harmless, otherwise things could get concatenated. | 20:02 | |
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| travis-ci | MoarVM build passed. Samantha McVey 'Merge pull request #1001 from Kaiepi/configure2 | 20:10 | |
| travis-ci.org/MoarVM/MoarVM/builds/459918511 github.com/MoarVM/MoarVM/compare/6...07866af856 | |||
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| brrt | .tell jnthn you were right, .net is much superior to java / jvm | 21:37 | |
| yoleaux | brrt: I'll pass your message to jnthn. | ||
| brrt | as I am learning the hard way | 21:40 | |
| timotimo | i don't see where exactly spesh logs are freed | 22:07 | |
| oh | 22:09 | ||
| maybe i see where it happens | |||
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| lizmat | And another Perl 6 weekly hits the Net: p6weekly.wordpress.com/2018/11/26/...onga-grep/ | 22:57 | |
| jnthn | Quite a few things for a slow week :) | 23:06 | |
| yoleaux | 21:37Z <brrt> jnthn: you were right, .net is much superior to java / jvm | ||
| jnthn | lizmat++ | ||
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| timotimo | jnthn: the spesh worker and threads are supposed to recycle spesh logs, right? | 23:38 | |
| because i'm seeing MVM_spesh_log_create be called over and over | 23:42 | ||
| hum. my idea that maybe it's not running gc was not supported by evidence | 23:47 | ||
| bleh. the watched pot never boils | 23:55 | ||