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Strykker ,

Except the C++ “Core dumped” line is telling you it just wrote a file out with the full state of the program at the time of the crash, you can load it up and see where it crashed and then go and look at what every local variable was at the time of the crash.

Pretty sure you can even step backwards in time with a good debugger to find out exactly how you got to the state you’re currently in.

neosheo ,
@neosheo@discuss.tchncs.de avatar

Where does it write the file

Plasma ,
@Plasma@lemmy.ml avatar

I believe it’s /var/lib/apport/coredump on Ubuntu.

Swedneck ,
@Swedneck@discuss.tchncs.de avatar

imagine if it, like, told you this so you didn’t have to find out about it via a post on lemmy

current ,

i mean you’re expected to know the basic functioning of the compiler when you use it

PotatoesFall ,

imagine if it like, read that file and gave you a stack trace

ysjet ,

gdb gives you waaaaaaaaaaaaaaay more than a stack trace.

TarantulaFudge ,

I love gdb! I recently had to do a debug and wow its so cool! On gentoo I can compile everything with symbols and source and can do a complete stack trace.

TangledHyphae ,

Am I the only one in this thread who uses VSCode + GDB together? The inspection panes and ability to breakpoint and hover over variables to drill down in them is just great, seems like everyone should set up their own c_cpp_properties.json && tasks.json files and give it a try.

inetknght ,

…unless you build the executable with optimizations that remove the stack frame. Good luck debugging that sucker!

ysjet ,

Imagine if you knew the most basic foundational features of the language you were using.

Next we’ll teach you about this neat thing called the compiler.

russjr08 ,

I’m not a C/C++ dev, but isn’t apport Ubuntu’s crash reporter? Why would dumps be going into there?

Though on a rhetorical thought, I am aware of systemd’s coredumptctl so perhaps its collecting dumps the same way systemd does.

ysjet ,

wiki.ubuntu.com/Apport

It intentionally acts as an intercept for such things, so that core dumps can be nicely packaged up and sent to maintainers in a GUI-friendly way so maintainers can get valuable debugging information even from non-tech-savvy users. If you’re running something on the terminal, it won’t be intercepted and the core dump will be put in the working directory of the binary, but if you executed it through the GUI it will.

Assuming, of course, you turn crash interception on- it’s off by default since it might contain sensitive info. Apport itself is always on and running to handle Ubuntu errors, but the crash interception needs enabled.

russjr08 ,

Ah I see, that’s actually pretty cool - thanks!

ysjet ,

np

Agent641 ,

Nobody knows

unionagainstdhmo ,
@unionagainstdhmo@aussie.zone avatar

Probably the same place as failed sudo reports

flashgnash ,

On a secret FBI server somewhere where they watch your failures and laugh

unionagainstdhmo ,
@unionagainstdhmo@aussie.zone avatar

When you apply for a home loan or a passport:

“Unfortunately we will have to reject your application”

“Why?”

“We have received several reports of failed sudo attempts and segmentation faults”

elxeno ,

you can set it

tl;dw: writes to the path in /proc/sys/kernel/core_pattern

soulsource ,
@soulsource@discuss.tchncs.de avatar

If you are using systemd, there’s a tool called coredumpctl.

lowleveldata ,

let’s not act like Java’s error log is useful

skullgiver , (edited )
@skullgiver@popplesburger.hilciferous.nl avatar

deleted_by_author

    •
    kbal ,
    @kbal@fedia.io avatar

    Super-advanced java devs like me do it like try{} catch (Exception e) { System.out.println("something went wrong"); e.printStackTrace(); }

    skullgiver , (edited )
    @skullgiver@popplesburger.hilciferous.nl avatar

    deleted_by_author

    •
    xmunk ,

    On Error Resume Next never before have more terrible words been spoken.

    tool ,
    @tool@lemmy.world avatar

    On Error Resume Next never before have more terrible words been spoken.

    Every time I’m reading a PowerShell script at work and see -ErrorAction SilentlyContinue I want to scream into a pillow and forcefully revert their commit.

    I’ve actually done it a few times, but I want to do it every time.

    xmunk ,

    And that’s why you’re a hero.

    kaffiene ,

    Yeah cos everyone knows other languages are impossible to write bad code with

    lowleveldata ,

    you can follow any exception down to the exact line of code

    Which is usually not a piece of code written by us and is caused by another piece of code not written by us either

    MyNameIsRichard ,
    @MyNameIsRichard@lemmy.ml avatar

    Does your IDE not highlight the lines written by you in a different colour? Of course that doesn’t help when it’s an error in production!

    BangersAndMash ,

    Is it possible to make intelliJ do this?

    MyNameIsRichard ,
    @MyNameIsRichard@lemmy.ml avatar

    I thought it highlighted the line number in blue when it was your code. I use eclipse so can’t properly remember

    merc ,

    but you can follow any exception down to the exact line of code (or JNI call, I guess) where the problem occurs.

    But, it’s not really where the problem occurred. How often do you get a stack trace and the bug fix is at the line referenced by the stack trace? Almost never. It’s more that it takes you down to the exact line of code where the effects of the problem are bad enough to affect the running of the program. But, the actual problem happened earlier, sometimes much earlier.

    For example, NullPointerException isn’t actually the problem, it’s a symptom of the problem. Something didn’t get initialized properly, and nobody noticed for a while, until we tried to use it, and got a null pointer. Sometimes it’s easy to go from the effect (null pointer) to the cause (uninitialized thing). But, other times that “thing” was passed in, so you have to work backwards to try to figure out where that thing comes from, and why it’s in that broken state.

    Sure, it’s better than nothing, but it’s still frustrating.

    Aurenkin ,

    I think it’s pretty useful, be interested to hear your hangups with it though because it’s definitely not perfect.

    If something goes wrong and I have a stack trace, that plus the type of exception will almost always be enough for me to figure out what’s wrong at least as a starting point. I’ve worked mostly with JVM languages in my career though so maybe I just don’t know how bad it actually is.

    kaffiene ,

    It’s not bad. It’s better than what most languages give you

    Fades ,

    skill issue

    marcos ,

    The same applies to using the core dump.

    In fact, the Python one is the lest useful of the trio.

    xmunk ,

    When the day comes that you need gdb you will indeed be amazed at how fucking powerful it is. If your server crashes grab that core dump!

    Omega_Haxors ,

    Implying you can’t consistently go to the same line every time and it always has what you need.

    kaffiene ,

    It’s extraordinarily useful

    FlatFootFox ,
    @FlatFootFox@lemmy.world avatar

    My favorite compile error happened while I was taking a Haskell class.

    ghc: panic! (the ‘impossible’ happened)

    The issue is plainly stated, and it provides clear next steps to the developer.

    ignotum ,

    I had a similar error, though not from the compiler
    Error message just read this should never happen

    RedBauble ,

    Ah, good old PlarformIO

    Dirk ,
    @Dirk@lemmy.ml avatar

    Python: So you used spaces and tabs for indentation? NOW DIE!

    xigoi ,
    @xigoi@lemmy.sdf.org avatar

    Good. Spaces and tabs for indentation should never be mixed in any language other than Whitespace.

    Dirk ,
    @Dirk@lemmy.ml avatar

    Raw adjust with tabs, fine adjust with spaces.

    Don’t laugh, people are actually doing that.

    Faresh , (edited )

    Some people use tabs for indentation and spaces for alignment. It kind of gets the pros of tabs (user configurable indent-width) and the pros of spaces (alignment). That doesn’t work in Python where you can’t align stuff and the interpreter doesn’t allow mixing tabs with spaces, but in other languages it is a possible style.

    BeardedGingerWonder ,

    There are no pros to tabs. Configure tabs to a number of spaces.

    brettvitaz ,

    Are you ok?

    WhiteHawk ,

    Mixing spaces and tabs should be a warcrime.

    merc ,

    Find me anyone who claims they use tabs for indentation, and I bet I’ll find at least one case where they’re using both tabs and spaces.

    The only safe way to avoid war crimes is to avoid tabs.

    dotMonkey ,

    I use the tab key but I’m pretty sure vs code converts that to spaces

    gears ,

    Depends on your settings, but yeah typically it does

    merc ,

    It worries me that a programmer wouldn’t know for sure what’s happening when they hit tab, and that it’s a setting that can be changed.

    dotMonkey ,

    I mean I was 99% sure it convert to spaces, I cannot say I was certain. The default settings are fine for what I do, I only ever had to change the spacing from 4 to 2 spaces once when dealing with someone else’s files

    HopFlop ,

    Why would I use spaces if I use tabs? Also, it seemd like a huge waste of time hitting the space bar so many times…

    merc , (edited )

    Why would I use spaces if I use tabs?

    To comply with Python’s best practices:

    peps.python.org/pep-0008/

    Also, if you work on the Linux Kernel, you’ll see a mix of tabs and spaces:

    elixir.bootlin.com/linux/latest/…/bfq-iosched.c#L…

    Also, it seemd like a huge waste of time hitting the space bar so many times…

    You use an editor that doesn’t auto-indent?

    FlorianSimon ,

    I assume this was a joke 😁

    BeardedGingerWonder ,

    I use vi without syntax highlighting.

    FlorianSimon ,

    Please don’t hack me, mister FBI

    BeardedGingerWonder ,

    To be fair you can totally bind an arbitrary number of spaces to tab in vi. I’ll dig out the syntax highlighting file some time. Oh and I use vim really.

    FlorianSimon ,

    I do use neovim myself too 😁

    Holzkohlen ,

    Don’t IDEs just replace any tab with 4 spaces anyways? Pretty sure VSCode does

    _dev_null ,
    @_dev_null@lemmy.zxcvn.xyz avatar

    I don’t use an ide, but I wrote a script that replaces any space I type with four.

    I haven’t worked out all the use cases yet, though.

    merc ,

    That’s a setting in the editor.

    ramsay ,

    Linux kernel?

    www.kernel.org/doc/html/…/coding-style.html#inden…

    edit: oh python, nevermind

    merc ,

    The kernel definitely mixes tabs and spaces:

    elixir.bootlin.com/linux/latest/…/bfq-iosched.c#L…

    pingveno ,

    And in Python, it’s merely a SyntaxCrime.

    malle_yeno ,
    @malle_yeno@pawb.social avatar

    Mixing tabs and white spaces in 2024 is categorically a you problem lmao

    ElCanut , (edited )

    Rust developer: I’d like to compile some code

    Rust compiler: the fuck you are

    malle_yeno ,
    @malle_yeno@pawb.social avatar

    The rust compiler holds your hand, wraps you in blankets, makes you hot chocolate, kisses you on the forehead before it gently and politely points out what you did wrong and how you can solve it step-by-step. It would never think of something as heinous as swearing at you, shame on you for insulting my wife’s honour like this.

    BautAufWasEuchAufbaut ,
    @BautAufWasEuchAufbaut@lemmy.blahaj.zone avatar

    I need a rust compiler in my life 😍

    theherk ,

    Damn right. And once it compiles… it works.

    django ,

    Meet my friend: .unwrap()

    theherk ,

    Fair.

    ElCanut ,

    Rust compiler is passive agressive, like:

    “There’s an error at line 286 because you still don’t know how to use the borrow checker after all this time ♥️”

    deur ,

    its a compiler. That is at best projection, especially considering how the compiler’s error feedback is designed to be firm yet gentle.

    planish ,

    The rust compiler produces a flawless understanding of your code, and then quits out because understanding that code is a Nightly-only feature and you’re using the stable build.

    _xDEADBEEF ,

    except when it gives errors about lifetimes of some object.

    boy, that makes my brain hurt

    hector ,

    I don’t know from where this legend comes from but lifetimes/concurrency/macros errors are brain-hurting.

    Most of the time I find myself dropping project because I wrote my program in a correct way but Rust just does not like how it is designed lol. I can’t get shit done with this language

    crispy_kilt ,

    gdb: Am I a joke to you?

    henfredemars , (edited )

    Yes. It’s a surprisingly bad debugger the more you think about it. I use it largely in assembly and it loves to spit out random errors about memory it tried to access based on the current register state. The shortcuts are kind of dumb.

    It certainly works but I wouldn’t call it a pleasure to use.

    Ex: try disp x/1i $eip often just doesn’t work.

    TunaCowboy ,

    I use gdb with great success for x64, rv64, and c:

    info registers rip or just setup tui:

    
<span style="color:#323232;"># ~/.config/gdb/gdbinit:
</span><span style="color:#323232;">tui new-layout default regs 1 {-horizontal src 1 asm 1} 2 status 0 cmd 1
</span><span style="color:#323232;">tui layout default
</span><span style="color:#323232;">tui enable
</span>
    xan1242 ,
    @xan1242@lemmy.ml avatar

    I honestly vastly prefer using IDA and Windows specific tools (x64dbg) over gdb. IDA can interface with gdb so it can act as a frontend which can be handy for visualization.

    ScreamingFirehawk ,

    Embedded C entered the chat

    flubba86 ,

    Your loop had a race condition, so we let the smoke out for you.

    Trarmp ,

    Ho hoo, that isn’t smoke, it’s steam, from the steamed rams we’re having! Mmm, steamed rams.

    TheGalacticVoid ,

    Can’t believe that my code is racist smh

    mindbleach ,

    // I am responsible for every byte of this code and still don’t know why this line breaks everything.

    Socsa ,

    Imagine unironically praising Java.

    kogasa ,
    @kogasa@programming.dev avatar

    Java good

    Socsa ,

    Opinion bad

    pingveno ,

    Java: Not all poo poo.

    flubba86 ,

    The one thing I can say about java; the kinds of people who like Java tend to really like Java. Everyone else just leaves them to it.

    Lemzlez ,

    And the people hating on it somehow never used any version above 8, which is 10 years old and EOL.

    flubba86 ,

    Oh I’m firmly in the second camp. They can use whatever version they like, as long as I don’t have to go near it.

    towerful ,

    Same could be said about PHP

    thtroyer ,

    Having used PHP and Java extensively in my career, it’s always entertaining to read what people think about these languages.

    zalgotext ,

    I haven’t touched PHP since college, so about a decade, but back then I compared it to a very disorganized but well equipped toolbox. Everything you need to do your projects is there, but it’s scattered through 12 different unorganized drawers and cubbies, there’s an annoying mix of metric and imperial stuff, plus some random bits and bobs you inherited from your grandfather that you have no idea what they do.

    QuaternionsRock ,

    I’ve used Java 21 pretty extensively, and it’s still comically bad compared to various alternatives, even apples-to-apples alternatives like C#. The only reason to use Java is that you’ve already been using Java.

    Lemzlez ,

    it’s still comically bad compared to various alternatives, even apples-to-apples alternatives like C#.

    I’d be interested to hear why. IMO Java has the superior ecosystem, runtime(s!), and community. The best part is that you don’t even HAVE to use java to access all this - you can just use kotlin, groovy, scala,… instead.

    In terms of the language itself, while it (still) lacks some more modern language features, it has improved massively in that area as well, and they’re improving at a significant rate still. It also suffers from similar issues as PHP, where it has some old APIs that they don’t want to get rid of (yet?), but overall it’s a solid language.

    mindbleach ,

    All the ideas are good.

    Only the ideas are good.

    kaffiene ,

    Java is awesome. There ya go

    wathek ,

    Oh yes, let’s pick on the weak programming languages because haha funi

    humbletightband ,

    Java is good. Supporting Java legacy is bad

    spacebanana , (edited )
    @spacebanana@lemmy.world avatar

    Java is a traditional and conservative language, which has its strong upsides, like the syntax being familiar to many people who haven’t used the language before. It’s a language that brought us the JVM, gave a job to many people and established fundamentals for other languages to inspire and improve on. If you don’t like Java, you can just use another language for the JVM, like Scala, Kotlin or Clojure.

    KammicRelief ,

    and inspired C#, which is pretty rad! (humble opinion… preparing for downvotes because I don’t get the feeling lemmy is where M$ devs hang out)

    deur ,

    Only a fool could miss the value C# has when used to solve the proper problems :)

    KammicRelief ,

    Totally! Thanks 😊

    docAvid ,

    You only named one upside, I can’t think of any other, and C-like syntax is pretty common, so it’s not much of an upside. It’s at least debatable whether the JVM is a good thing at all - the majority of languages get along perfectly well without it, and there’s no reason to believe the ones that do target it wouldn’t be doing just fine if it didn’t exist. It’s weird to say Java gave a job to anybody - the demand to have software written resulted in programmers being hired; if Java hadn’t been pushed on the market by Sun, it would have just been another language. Java didn’t establish any fundamentals at all, it just borrowed from other places. While all three of the other languages you mention are interesting, for sure, I’m not sure why somebody who doesn’t like Java should limit themselves to JVM languages.

    elxeno ,

    heh

    marcos ,

    The guy is testing the result of malloc and you are complaining about how?

    TheDudeV2 , (edited )

    www.youtube.com/

    If you’re a programmer, or think you might want to be one, I highly recommend this channel. He’s a savant at all sorts of low level things, quite funny and entertaining, and does a fantastic job of explaining what’s going on.

    russjr08 ,

    tsoding’s channel is one I look forward to watching every single day, never a dull moment in his streams/videos.

    If you’re someone who likes to watch things live, his Twitch channel is available here.

    towerful ,

    Good gods, a long-form content creator! Will be checking this out later

    vox ,
    @vox@sopuli.xyz avatar

    he’s russian tho

    Flxibit ,

    This C++ message has an urgency vibes to it:

    “Segmentation fault!! Drop the Nuclear Reactor quick!!”

    FiskFisk33 ,

    Average C++ error

    Average C++ error

    vox ,
    @vox@sopuli.xyz avatar 
    
<span style="color:#323232;">gdb ./fuck
</span><span style="color:#323232;">r
</span><span style="color:#323232;">where
</span>

    you should get a complete stack trace (complete with values of some function arguments)

    Subverb ,

    Nevermind that the C++ program is two orders of magnitude faster when completed.

    I would love to learn and use Rust but I’m a embedded systems guy. Everything of consequence is C and C++.

    T156 ,

    If the embedded system is old or poorly-maintained enough, there might be more Rust than you’d think.

    cucumber_sandwich ,

    There’s embedded rust for a few platforms. Using it on ESPs is fun

    Knock_Knock_Lemmy_In ,

    Rust seems pretty performant

    …pages.debian.net/…/rust-gpp.html

    Subverb ,

    I meant faster than Python, not faster than Rust. Rust is fast.

    Knock_Knock_Lemmy_In ,

    Ah. OK. Makes more sense.

    ooterness ,

    No bounds checking, only fast.

    OpenStars ,
    @OpenStars@startrek.website avatar

    This right here - C++ iirc is used mostly for microprocessor code in an industry setting, where EXTENSIVE testing is done so that bloated code doesn’t need to constantly check for programmer errors every single time, i.e. where execution speed is prioritized over programmer development time. And whenever that is not the case, well, as OP pointed out, other higher-level languages also exist (implication: to choose from).

    BaardFigur ,

    deleted_by_author

    •
    tool ,
    @tool@lemmy.world avatar

    Lots of those in C# now, especially with Unity coming along like it did.

    Backslash ,

    C++ iirc is used mostly for microprocessor code

    lol no, it’s used almost everywhere where performance is important and people want(ed) OOP, from tiny projects to web browsers (Chrome, Firefox) to game engines (Unreal, CryEngine). Many of these are hugely complex and do encounter segfaults on a somewhat frequent basis.

    Saying C++ is mostly used for embedded applications is like saying C# is mostly used for scripting games, i.e. it doesn’t nearly cover all the use cases.

    higher-level languages also exist

    This depends on your definition of “higher-level”, but many people would argue that C++ is on a similar level to Java or C# in terms of abstraction. The latter two do, however, have a garbage collector, which vastly simplifies memory management for the programmer(generally anyway).

    scrion ,

    I also currently use it for a new project since all needed 3rd party libraries are from a very specific domain and the project has a deadline, so writing and testing wrappers for Rust that would provide me with any meaningful advantages down the road are too costly to budget for before the deadline.

    That could become part of a future refactoring, though.

    tunetardis ,

    There is bounds checking, but it’s opt-in. I often enable it on debug builds.

    repungnant_canary ,

    Joke on you until the python program segfaults

    Bene7rddso ,

    If it does it’s because of C/C++ code

    AMDIsOurLord ,

    The developer must either provide the logging and attach a debugger or go get fucked when a runtime error happens

    kureta ,

    are you c++?

    Faresh ,

    That’s not true though. You can get the backtrace and other useful information from the coredump mentioned by the error message by loading it with gdb. Not as good as attaching it to a living process, since you can’t see step-by-step what happens leading up to the error, but still quite useful.

    AMDIsOurLord ,

    Well yes, that’s a pretty good way of debugging a third party app but if you are developing something you can have more ease with gdb attached

    drolex ,

    You can also debug post-mortem with the minidump or the core dump file with WDT on Windows. Great fun and a good way to brush up on your assembly skills

    marcos ,

    Great fun and a good way to brush up on your assembly skills

    Just load it on the debugger and leave your asm skill gather patina.

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