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#rockbox log for 2021-08-04

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07:35:57_bilgusI think I spent around 3 minutes changing config to get the arm cc to work with coverity and then around 2 hours of waiting for full compiles to verify it worked
07:36:43_bilgusI need to get my rig put back together :/
07:47:29_bilgusUp to 14 builds per week, with a maximum of 2 build per day, for projects with 500K to 1 million lines of code
08:13:46speachywe've over 1M, but maybe not any one individual build
08:15:49speachy200 new defects, 47 fixed. ugh. different target maybe?
08:16:05speachyyep, this time with SDL
08:23:13speachyany objections if we tell coverity to just ignore the SDL games?
08:25:11speachydone. and fixed the path to doom too.
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08:39:44***Started Dancer V4.16
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09:07:36_bilgusoh we are prob fighting each other :)
09:14:37_bilgusthats silly to use descent parsing and not give a way to reorder
09:17:27_bilguswell they did remove and place at the end
09:24:31speachyshould that be *data2_16++ instead?
09:25:57speachyno, I guess it's correct. but
09:26:15_bilgusthat would make it the same as the one below
09:26:28speachyconfusing code construct.
09:26:59speachymarked it as a false positive
09:27:12_bilgusI saw some stuff in the bug list that I can't grok
09:28:19_bilgusI don't know if its a bug or not gonna have to find someone smarter to decide if we can ignore it :P
09:28:50speachybut back to the mpegplayer; it dates to the archos days, and is full of horrid horrid hacks and convolution. it's also the only user of some of the more esoteric plugin API stuff.
09:29:29speachyI have a hard time seeing how anyone would choose to convert video to mpeg1 and play it back on these tiny screens when compared to the ubitiquous smartphone now.
09:33:40_bilgusI see no reason to keep it
09:37:59*speachy rubs his hands together and cackles.
09:38:43_bilgusso I guess it takes the defect density of the ignored components and applies them towards the calc using the valid component line count?
09:38:50_bilgusdefect density 2.19
09:38:55edhelas_bilgus time to add H264/HEVC support then :p ?
09:39:24_bilguspatches welcome? :p
09:39:25speachyedhelas: on couple-hundred-mhz ARMv4t? :)
09:53:03speachyso.. g#3650 :D
09:53:05rb-bluebotGerrit review #3650 at : RFC: Get rid of mpegplayer plugin by Solomon Peachy
09:53:39edhelasThat's a lot of red
09:54:22speachy21KLOC removed
09:58:33rb-bluebotBuild Server message: New build round started. Revision 37bfcab23f, 303 builds, 9 clients.
10:04:23speachymost of that is libmpeg2
10:04:43speachyor at least 50%
10:06:22_bilgusFor future reference you have to add the cross compilers to coverity 'cov-configure −−comptype gcc −−compiler arm-elf-eabi-gcc −−template' & 'cov-configure −−comptype gcc −−compiler mipsel-rockbox-linux-gnu-gcc −−template'
10:07:00_bilgusit appears it shares them but it also keeps them in the build directory
10:07:23_bilgusalso arm has cached building I think I had to remove that
10:08:52gevaertsI'd say it might make sense sense to ask on the forums first. People use all sorts of things that don't seem to make sense
10:09:52speachyI'm sure there's _someone_ out there using it. just like there were still someones using archos builds.
10:10:17gevaertsWell, I'd expect mpegplayer to be more common than archos builds
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10:11:46rb-bluebotBuild Server message: Revision 37bfcab23f result: All green
10:14:00gevaertsMost recent topic about it on the forums is from 2019. There was one newer one, but that turned out to be spam :)
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10:36:04speachy_bilgus: I think we should separate the actual codecs from rockbox-specific stuff (eg the metadata parsers)
10:36:55_bilgusyeah more granular
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10:56:27rb-bluebotBuild Server message: New build round started. Revision c522917644, 303 builds, 9 clients.
10:56:45speachyit's only showing 229 defects in the non-ignored stuff now.
10:57:14_bilgusmetadata .*/rockbox/lib/rbcodec/metadata/.* No 7,464 10.05
10:57:38_bilgus10 defects per 1000 lines
10:58:09speachynow that's what I'd expect
10:58:17_bilgusi'll need to un ignore doom for builtin to look at it
11:05:12speachyamachronic: Is g#3612 in submittable state? would be good to get those fixes in
11:05:16rb-bluebotGerrit review #3612 at : Document intentional fallthroughs + fix harmless unintended ones by Aidan MacDonald
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12:07:16_bilguslooks like 60% of the doom bugs are returning -1 on error and later using it as an index
12:07:45_bilgusill try to knock them out this eve
12:23:28speachyit's preferable to try and update to a newer upstream snapshot first
12:23:55speachy... we don't want to diverge from upstream any more than necessary
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12:43:22bluebrotheroh, Rockbox on coverity? Nice.
12:43:51*bluebrother requests access
12:44:52speachybluebrother: done
12:45:59braewoodsspeachy: why do they always seem to consider switch fallthrough as an error? that can be a feature if you design for it...
12:46:38speachybecause in practice, it nearly always is an error
12:47:26braewoodsone of the legit uses it duffman's device
12:47:43braewoodswas the name something else
12:49:53gevaertsIs that legit though?
12:50:12braewoodsat one time probably
12:50:19braewoodsmost of the time memcpy is a far better option today
12:51:26gevaertsAs I remember it, that example was provided with the comment "I don't know if this is an argument for or against" or something like that
12:52:22braewoodsit seems like a clever way to handle copying the "remainder" of a copy function
12:52:40braewoodsbefore switching to a larger block copy mechanism
12:52:56bluebrotheris that analysis running on _bilgus machine?
12:53:10braewoodsin any case i've never used duff's device
12:54:00gevaertsDuff's device also uses a somewhat counterintuitive interleaving of switch and while, which I think is actually the more special bit about it. Its use of fallthrough is kind of minor compared to that
12:55:52braewoodsit's not the kind of thing you'd use in normal C code but it might end up in low level code that needs to optimize for speed and something better doesn't exist.
12:55:59braewoodslike libc code
12:56:26braewoodsi've seen a lot of hack jobs in libc
12:56:55gevaertsI've definitely used fallthrough in code in what I would consider more "normal" ways, but these days I tend to agree that things going wrong due to missing break;s are more annoying than the gains from easy fallthrough
12:57:26braewoodsi also use goto when i need to do something not really possible any other way
12:57:28gevaerts(imagine that said in a better sentence)
12:57:58gevaertsThe difference is that you can't accidentally introduce a goto by forgetting something else
12:59:17braewoodsand it doesn't have nasty surprises like longjmp
12:59:36bluebrotherthe approach I know (and use) is to always add a comment stating /* fallthrough */ if I explicitly want one. No break and no comment? Bug.
12:59:58braewoodsi've never used longjmp aside from libraries that require it
13:00:09braewoodslongjmp is tricky when you have system resources to free
13:02:34gevaertsI once had a bit of code with horrible macros that added try, catch, and throw using longjmp. That code didn't do dynamic resource allocation which helped, but even so, I kind of want to repress the memory :)
13:03:27gevaertsI was young then and didn't know I had to be scared of certain things
13:04:06braewoodsleave that in C++ land.
13:04:39braewoodsi ended up implementing my new inflate module as a single function so i could use goto to simplify errors
13:04:49braewoodsand also benefit from code inlining
13:05:06braewoodsit's really long and one of the rare cases where i had reason to do that
13:05:41braewoodssince i can't really use longjmp in rockbox this was the next best thing
13:05:50braewoods(longjmp isn't available everywhere from what i saw)
13:06:35braewoodsi still need to do a review to make sure i didn't miss anything
13:07:15braewoodscurrent draft
13:08:33braewoodsin theory it could also be paired with microtar to support basic compressed tarballs
13:09:06braewoodsnot that i can see a reason to
13:09:41braewoodsi do no resource allocation in inflate so i don't need to bother with freeing anything
13:09:51*gevaerts finds the code again and decides to claim it's company-confidential and he can't share it :)
13:09:58braewoodsthat's all on the caller to setup
13:10:22braewoodsit also allows them to reuse the same allocation if they need to decompress more than one stream
13:10:40braewoodsIO is entirely done through callbacks
13:10:57rb-bluebotBuild Server message: New build round started. Revision ef41cc6623, 303 builds, 9 clients.
13:11:17braewoodsmakes for a simple and clean interface
13:11:43braewoodsexpose the struct size through a constant global variable
13:11:56braewoodsso it can be allocated by a third party
13:14:07braewoodsto be honest i didn't even know it was possible to split a loop across multiple case statements
13:14:17braewoodsit's weird to see.
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13:22:09rb-bluebotBuild Server message: Revision ef41cc6623 result: All green
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14:28:15bilgus_phBluebrother yeah I ran those builds on my laptop my rig is still in a box even if I had a place to set it up
14:29:08bilgus_phCoverity recognized /* fall through */ but it doesn't recognize while () ;;
14:29:23bluebrotherwould it make sense to use github actions for this?
14:29:41bluebrotheroh, I saw a while () ;; getting flagged earlier :)
14:31:17bilgus_phYou mean to submit builds automatically?
14:32:35bilgus_phCoverity also fails at seeing through a ternary statement too
14:34:26bluebrotheryeah, kinda. So it isn't tied to someones gear.
14:34:55bluebrotherand then it can get triggered automatically like once per day.
14:39:02speachyI don't like that while () ;; thing; always preferred to use {} instead
14:39:02speachyI can tie it into the server's nightly cron/etc builds.
14:39:38bluebrotheralso an option :)
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14:40:31bluebrotherI did play around with gh actions like half a year back so that came into mind. But having it on the nightly builds is less external dependencies
14:40:49bilgus_phThat's probably the best bet but it makes builds take a lot longer
14:41:29bilgus_phIt says they have a Travis ci hook but iirc that's no longer free
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14:42:37bilgus_phYeah it does special processing on the build
14:42:37bertrikI used to use travis for arduino projects and java projects, but something broke
14:44:14speachyspeaking of servers, the last of the "new" parts arrived and passed the initial smoke test.
14:45:03speachy(and coincidentally, one of the other servers in the rack let the magic smoke out last night)
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14:59:48rb-bluebotBuild Server message: New build round started. Revision 005c414e5f, 303 builds, 9 clients.
15:07:11amachronicspeachy: that's 3612 merged... i think 2048 was the only genuine fallthrough bug I found.
15:07:37speachyamachronic: awesome, thank you
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17:02:06speachyso the new server hardware survived smoke testing in its final configuration (huzzah), which means it's time to work out when to take things offline for the motherboard swap.
17:02:38speachyshould take under an hour.
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20:13:03dconradah yes, 20 year old pcm code">
20:13:38_bilgusspeachy do it as you see fit :)
20:34:27_bilgusalso what do you consider upstream?
20:34:35_bilgusre DOOM
20:37:38speachyprboom, apparently
20:38:35speachybut our sources have likely diverged heavily
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20:51:34_bilguswell coverity has the big bunch still blocked but next upload itll be back to 2.6 or w/e
21:05:07_bilgusour source is prboom based i'm sure __builtin knows whats up
21:43:29braewoods_bilgus: would a macro library have value for rockbox? thanks to advances in the C standard it's now possible to create alternatives for simple variadic functions that have none of their conventional drawbacks.
21:44:39braewoodsit works by using variadic macros to wrap the arguments into an array via compound literals.
21:45:02braewoodspossibly also specifying the size of it via some CPP behavioral quirks
21:45:18braewoodsit does limit the practical arguments to like 60 or so
21:45:52braewoodsbut for something simple where you are literally working with an array of a single type
21:46:05braewoodsit works somewhat well and has better type checking than variadics ever could manage
21:46:45braewoodsthis has been possible since C99
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22:09:34_bilgusbraewoods, no clue? sounds more those other guys alley
22:17:14braewoods_bilgus: indeed. i'll give it a spin later on. i understand how to make it all work.
22:17:29braewoodsit's really ugly but that's well hidden in the headers.
22:17:46_bilgusthat complexity makes it a bitch later
22:17:53braewoodsit can greatly simplify some types of code.
22:18:11braewoodsi've used it to string together string concatenations one after the other
22:18:15braewoodsas an example
22:19:12braewoodsthe ugliest part is the hack for "counting" the number of arguments
22:19:31braewoodsotherwise it tends to be pretty clean
22:19:32_bilgusyeah its every combo
22:20:06braewoodsindeed, and it's capped at 63 args ish since the standard only allows macros to have up to 127 arguments
22:20:10_bilgus() - (,,,,,,bleh) Ive seen the idea elsewhere
22:20:12braewoods(minimum you can count on)
22:20:36braewoodsbut it could be useful for hiding the details of how to call this alternative to variadic functions
22:20:47braewoodssince it's technically all compile time info
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23:45:29_bilgusoh hmm apparently different builds change the count on the front of coverity
23:46:07_bilgusI wonder how that will play out with it doing builds off the buildfarm
23:48:03_bilgusfixed all the defects with a bootloader build yay!

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