"printable x86" is actually the best esoteric programming language

@nokkonokko

4 жыл бұрын

Good luck golfing with it...

@want-diversecontent3887

3 жыл бұрын

I don't know x86 but I'll try with 6502

@tissuepaper9962

2 жыл бұрын

@@nokkonokko invent a new form of code golfing called "novelwriting" and see who can write the longest readable book that is also a useful program.

@ex5392

Жыл бұрын

@ilkemincraft753 and then actually perform the play

@ashleybyrd2015

Жыл бұрын

@@tissuepaper9962 what defines a useful program? because it certainly seems hard

"Outside of this region is a bunch of hooey." Might be the best description of UTF-8 I've ever heard of.

@simonmultiverse6349

3 жыл бұрын

3:53

@dragonridertechnologies

Жыл бұрын

Well, yes, but it's still better than the other UTF representations.

@gloverelaxis

Жыл бұрын

i'd argue that UTF-8 is one of the most beautifully elegant ideas in all of computer science, up there with the Y combinator, but its genius lies in its simplicity and its social impact rather than logical gymnastics. having one dead-simple encoding for all historical and current human written language is a truly *marvelous* thing. i can speak the word "duck" to you in ancient Egyptian hieroglyphs very directly and literally: "𓅬", right here in this comment box. all blame for the hooey code points which don't represent written text, like BEL/BELL, lies with ASCII and the other historical ancestors. i fully support a version 2 that drops ASCII back-compat

@josephenders1893

11 ай бұрын

​@@gloverelaxisthe backwards compatibility of UTF8 is what makes it really interesting (and useful). Almost every source code file is representable with it in an incredibly clever way it allows the expansion into every other character you can want.

@kargaroc386

5 ай бұрын

Except for stuff like shift-jis which isn't compatible at all (aside that it uses ASCII for the first 127 code points like everything except ebcdic) and appears frequently enough to not just be completely forgotten but infrequently enough that people who need to know, don't know about it.

14:38 "This kind of fractal structure shows up a lot in computer science and mathematics and Hyrule."

@porky1118

6 жыл бұрын

I didn't hear that the first time, even if I didn't skip that part ^^

@EnderLord99

2 жыл бұрын

I mean, he's not wrong.

@MCRuCr

2 жыл бұрын

AND drinking games

@lollllloro

2 жыл бұрын

I wasn't sure it was "Hyrule" and I brushed the word off as some word I don't know.

@vieilatome2257

Жыл бұрын

Only link can defeat ganon

this video was good up until 25:03 at which point it was a masterpiece

@otesunki

5 жыл бұрын

haha

@TheJamie109

5 жыл бұрын

That was such a huge setup for that reveal. Im impressed. "Haha got you! I spent so long jumping through hoops to write this code to troll you!"

@dimkir100

5 жыл бұрын

My jaw dropped when it revealed the infamous image! :D :D LOL Great job! Amazing video and research! :)

@avieus

5 жыл бұрын

And better than the masterpiece was at 25:42

@FosukeLordOfError

3 жыл бұрын

I saw it coming at the last second, and I loved it. I wept tears of joy.

i love how you explained assembly without mentioning assembly

@Mmouse_

Жыл бұрын

People tend to learn to code at a fairly high level then wander down to lower levels. Whilst I was on that path, I couldn't help but think "this can't be how that's done, it's uglier than my most hacky code" - but sure enough, that is how it's done. Some people then wander down to hardware level and it's somehow even worse, after starting with a high level language and writing beautiful, Indented code then discovering that eventually it ends up as what can only be described as absolute shite it's pretty jarring.

@important9836

4 ай бұрын

Akin to submitting a proofread manuscript detailing how to build a rocket to reach the moon, and the caveman executing it just farts really hard and gets there. Your screen still shows a rocket.@@Mmouse_

@Doodoofart725

3 ай бұрын

​@@Mmouse_It's somehow relieving. Even the best code I write ends up as unintelligble gibberish so whatever lol

@xavierrodriguez2463

25 күн бұрын

​@@Mmouse_just because something is meant to be human readable doesn't mean it's good, and just because something is ugly doesn't mean it's bad

@xavierrodriguez2463

25 күн бұрын

Imma be honest there's something incredibly beautiful about how a computer actually functions at a low level, abstract languages are cool but imo they're not more beautiful than machine code

"This kind of fractal structure shows up a lot in computer science, mathematics, and Hyrule" Gold

This is my favorite flavor of art. I don't know if you have won any modern art prizes but imo you deserve many. There was a guy who came to my uni to give a talk who did stuff like this but only a fraction as labour intensive (and therefore exponentially less cool), and he was a big time, famous conceptual artist. I can't remember his name but he did one piece where he threw colored sticks in the air and took pictures of them because hypothetically they could randomly happen to arrange themselves into a perfect representation of a hypercube (the pictures are wonderful). He did another one where he got every possible attachment for his camera and several pairs of glasses and things to improve vision and then took the shittiest bluriest self portraits (because it was basically impossible to operate with this many "upgrades"). And the last one that I remember which was also very beautiful, he took 2 super long exposure photos of him laying on his back and then his front while listening to the whole back and then front of a public enemy record. He was one of my favs but after watching several of my videos you've definitely usurped him (and the others who shall remain nameless because of my shit memory). In about a decade look out for my comment on someone else's video where I detail my vague memory of your work hahaha. Anyway, sorry for the ramble, great stuff as usual, I'm off to watch the rest.

@tom7

Жыл бұрын

Thank you! I'm content with becoming a vague memory in a decade :)

@kasparpoland9803

9 ай бұрын

Couldn't have put it into words any better myself. It's really inspiring :)

@viniciusmv7727

5 ай бұрын

​@@kasparpoland9803 That's a great pun considering the video

I'd love to see a video of you creating a blank text file, typing the program in, saving it as a .exe, and running it. It would really drive the point of this exercise home.

@tom7

7 жыл бұрын

Are you sure? :) Unfortunately due to constraints in the header, these EXEs have to be 400k. Did you see that video of a guy live-streaming pressing his mouse button a million times? It'd basically be like that!

@waxt0n

3 жыл бұрын

@@tom7 could you have a macro that does it?

@ccgarciab

3 жыл бұрын

@@waxt0n well, he has the compiler that he described in the video

@randomblogger2835

3 жыл бұрын

@@tom7 make .coms instead of .exes.

@__lasevix_

2 жыл бұрын

@@tom7 pay someone to do it

The huge step here is when you realized that it is in fact impossible to write a regular program without any of the 8-bit bytes, and then decided to use an entire 64 KB block as your program, with wraparound at the end. I did the opposite back around 1992, by deciding to write an executable ascii program that used an even smaller character set: Just the 70+ chars that are blessed by MIME as passing transparently through any email gateway. This is the 65 MIME Base-64 set plus a handful of others that don't need any quoting. My final result does the absolute minimum possible amount of self-modification: A single 2-byte backwards JMP opcode is sufficient to enable the primary bootloader (two 64-byte lines, with optionally one or two line separator chars) to run. This boot loader decodes pairs of Base-64 chars to generate any byte value, so it encodes a maximally dense Base64 decoder which is used to decode and optionally either save to disk or execute the actual payload.

@yairmorgenstern416

18 күн бұрын

Sounds like a video in of itself :)

@TerjeMathisen

18 күн бұрын

@@yairmorgenstern416 The part I'm really proud of is that I wrote that program on paper only, while on an Easter ski break, and it all worked as soon as I typed it in. 🙂I did bring a printout of all the legal opcodes/opcode combinations.

you terrify me

This is just brilliant! Do you have any source for your inspiration, or is it just plain craziness?

@tom7

7 жыл бұрын

Thanks! :) I just write down silly ideas I have, then spend months executing them...

@ster2600

3 жыл бұрын

@@tom7 I wish I was as dedicated to my actual life as you are to these seemingly pointless yet fascinating projects

@imperatusmauser7096

3 жыл бұрын

@Ibrahim Braydon wow, bots

@devhypercoder2522

3 жыл бұрын

@@imperatusmauser7096 and even a reply bot lol

@imperatusmauser7096

3 жыл бұрын

@@devhypercoder2522 I've been seeing these bots everywhere, especially in CodeVault's videos

I've played enough TIS-100 to know how impressive this is.

@MultipleObjectSelector

6 жыл бұрын

car keys TIS has basically no instructions compared to IA or even ARM. IA is more complicated than most languages that target it.

@unflexian

5 жыл бұрын

GET SHENZHEN IO ALSO EXAPUNKS LOOKS FUN MHRD TOO

@BradenBest

5 жыл бұрын

@@unflexian MHRD is hard as shit. The furthest I could get without looking up schematics was the full-adder.

@Huntracony

5 жыл бұрын

@@unflexian Oh fuck, I already thought the Zachtronics games were next level but MHDR looks another few levels beyond that and now I have to play it.

@123sleepygamer

Жыл бұрын

This video made me think of that game. I suck at it so bad. Was better at Exapunks.

Did I just got rickrolled?

@tarberd

7 жыл бұрын

I... guess .... ??? I mean ... I'm confused ...

@niklasgransjen684

7 жыл бұрын

In a 25 min video, even.

@batfan1939

6 жыл бұрын

It's been so long since it happened to me, it took me a second to recognize it. Well, that, and it's 2:25 a.m.

@robertcullipher3492

6 жыл бұрын

The most elaborate rick roll ever!

@SreenikethanI

6 жыл бұрын

wait this comment has 256 likes... I don't wanna spoil it...

Man, "boring"? Tom7, I LIVE to see you post a new video, because it's always super interesting each and every time. I really hope that's not the *sole* reason you only make videos on things like, twice a year, if that, because I would be ECSTATIC if you had slightly more video content to share, WHATEVER it is.

@tom7

7 жыл бұрын

Well, thanks for saying that. :) The main reason I don't share more stuff is that I usually put a lot of work into the setup (this project was my main programming hobby for a few months) and since I have a full-time job, there's only so many hours in the day (and only so many brain-sugars in the brain)!

@TheMaplestrip

7 жыл бұрын

suckerpinch I was really happy when you said you wouldn't be explaining bytes and byte code and all that. I was worried I would be forced to sit through a lot of stuff I already knew. You ended up not explaining a lot of stuff I didn't know, but that was completely fine because you explained everything that was needed to understand the video. It's this kind of editorial control that makes your videos a joy to watch.

14:33 You already had me in, but man... BTW: I didn't think I'd ever see a Numberphile parody. Very nice

@tom7

7 жыл бұрын

Thanks for watching! :)

You may find Ladder Diagram an interesting “programming language”. It is widely used in industrial automation on programmable logic controllers (PLC). It follows like your ladder idea and evolved out of industrial machinery using hardwired relay logic.

@123sleepygamer

Жыл бұрын

That is very interesting.

This needs to be printed in a book with one of those misleading 80s qbasic 'games, puzzles and more!' covers. Because nothing is better than OPLrolling yourself after typing for several hours.

@hobbified

Жыл бұрын

There was no QBasic in the 80s.

@ValeBridges

Жыл бұрын

@@hobbified Well, I suppose that's what makes them so misleading

Tom, as a young CS major, this channel is incredibly interesting. Thanks for all you do!

@tom7

7 жыл бұрын

You're welcome and thanks for saying so! :)

that was the most elaborate rickroll ever

@Hexcede

3 жыл бұрын

I didn't watch the full video. I set up DOSBox just to run the file to see what it does after trying to compile a different 16 bit emulator. I just went through so much effort to get rick rolled by a text file.

This was the most elaborate Rick Roll I've ever seen. You've earned my like and subscribe, good sir!

@davidmikan7925

3 жыл бұрын

you're kinda spoiling it for other people since it’s the top comment :/

@lucas29476

3 жыл бұрын

@@davidmikan7925 tbh KZread mobile app is to blame for displaying the top comment prominently. This functionality is included in the past few months

Oh how I love this channel! This video reminds me most of glitch abusers of video games like _Pokémon_ and _Super Mario 64,_ using the compiled-level code in ways it was never supposed to be used. What you did is absolutely gorgeous.

@tom7

7 жыл бұрын

aw thanks :)

@a_grin_without_a_cat

Ай бұрын

I recently saw some Zelda speedrun that uses the fucking arbitrary code execution to teleport through levels. It is slow and tedious to set up, it is extremely boring to watch (that's why it lives in a separate category now), but on a conceptual level it is just amazing.

"This kind of fractal structure shows up a lot in computer science and mathematics and Hyrule". Brilliant. Excellent video too. Absolutely inspired.

I was floored by the elegance of addition as a bridge between AND and XOR into OR

This is still my favorite KZread channel of all time. I really wish Tom would upload more often, but at least what he does upload is always gold!

@tom7

7 жыл бұрын

thank you (:

YOU'RE BACK! Excited to watch this video. I was kind of hoping for a unibicle kickstarter video but this will do I guess.

I'm proud to say that this video really made me understand what compilers are and how that kinda stuff works. Even around 3-4 years later I still occasionally come back

The most elegantly executed rick roll of all time. I salute you, sir.

I remember seeing programs that would work identically in some variation of unix shell, perl, and/or C, but doing one that's both valid plain text and DOS-executable is MENTAL. I love it!

the stuff you make consistently makes me want to cry while also being extremely impressed

Tom. You are a son of a bitch. I have waited for this day for almost a year now. How on earth did you find a way to outdo yourself. This is phenomenal.

@tom7

7 жыл бұрын

Hey be nice to my mommy! :)

@onradioactivewaves

Жыл бұрын

That's just how he rolls

It's a sad testament to the difficulty of collaborative filtering that for all the effort you put into this, only 150k people (if that, as I've seen it twice) have ever gotten to enjoy it.

@tom7

4 жыл бұрын

The important thing is that the RIGHT 150,000 people see it!

Hey, just wanted you to know that I found your channel a matter of days ago and have watched almost everything that you've posted. You're my hero! Working on amazingly unnecessary projects for their own sake is something that I heavily aspire to do.

Finally, only so many times i can watch your old stuff.

These videos are the most original programming videos on KZread. Always interesting and a pleasure to watch, and the length isn't really a problem! Still hope you'll do something more in the field of AI, though :)

I come back to this vid every couple of years, and every time I get to the end (after the first time) I *know* what's coming, and yet it still gets me.

The compiler analogy got me, every detail in this video is awesome.

Two vids in one years time? I love it :) Im honestly blown away so consistently by your work. Your enjoyment of wrestling with senseless problems is beautiful. I used to get excited over lots of channels new vids as a kid, but now i only get excited at your channel

@tom7

7 жыл бұрын

Aw thanks, I'm glad you enjoyed it :)

Tom, as a larval web designer with *just* enough experience playing TIS-100 to follow this, I have to say I'm pretty blown away by what you did here, not only with the 'what' but also with the way you explained things. I'm not a CS major by any means, and I wasn't really lost anywhere. Great job, and I'll be mentioning your channel to my developer friends when I go to class tomorrow. Looking forward to seeing your next video!

It's always a joy to see that you've posted something new. This is simply amazing, Tom. :D

@tom7

7 жыл бұрын

thanks for the encouragement! :)

I’m doing that thing every year where I rewatch all your videos and the Numberphile paper always delights me.

I heard a lot that self-limitations improve creativity and help finding new handy way to do something. But when you said "we can't just load a value to the register" a was just shocked. This video has insane amount of hilarious stuff and I totally enjoy it. Fantastic!

I have no words. This is incredibly amazing.

I've learned most of this stuff at school but before this video I always tought it was useless for most programmers, it was a good reality check thank you

Best video I've seen in a while. Such a great mix of entertainment, jokes and information. 25 minutes passed so fast!

Your deep knowledge of computer science, and your ability to communicate so effectively is absolutely brilliant and extremely inspiring. Your videos have captured my imagination, so thank you 😌

Couldn't you OR two numbers by doing (A XOR B) XOR (A AND B)? Seems like it would be easier than doing the 2's complement math...

@tom7

7 жыл бұрын

Yes, and good eye. Somehow I missed this option. Plus is a nice segue in the presentation, at least.

@asp-uwu

7 жыл бұрын

Cool! Did you have to write all of this assembly by hand? Or did you just be _very specific_ to the compiler what you wanted? Not sure which would be easier, actually...

@tom7

7 жыл бұрын

I wrote the compiler, so it's sort of a mix. At each stage (intermediate language) I get to pick what operations are available, but then I have to pay for that by implementing them (basically 'hand writing' code) in the next lower-level language. OR sticks around until the conversion to the "LLVMNOP" language, where it decomposes into AND, MOV, and XOR, and then I implement those three in printable x86 more-or-less by hand.

@asp-uwu

7 жыл бұрын

Hmmm, seems tedious. But then again, the process for making everyone of your entries so far does! Great stuff, man!

@rich1051414

5 жыл бұрын

@@tom7 "LLVMNOP" sounds like your toddler confidently trying to finish your sentence.

Honestly, between this and the running video, you give me a clear impression of what a person can get done in a single lifetime

Idk how I missed this one when it dropped, but fantastic stuff. I totally understood it, I swear. That said, as soon as you said "music", I knew where this was going, and you did not disappoint.

Awesome stuff! Though, quick question: Wouldn't (A xor B ) xor (A and B) also net you (A or B) ? ;)

@jurjenbos228

2 жыл бұрын

Of course

@MatheusAugustodaSilva

2 жыл бұрын

The "how dare you not save a couple instructions in a project that took you months to accomplish and yielded you a research paper" strikes again.

@bacicinvatteneaca

2 жыл бұрын

@@MatheusAugustodaSilva well, cutting in half the number of operations needed for a simple AND is kind of a big deal

I was literally just stalking your page today looking for more content.

I'm not sure what impresses me most: the absolutely bonkers thing you decided to do, how well you both pulled it off and explained it, or your absolutely deadpan sense of humor. I will be sharing this video with everyone I know who I believe has even a *modicum* of a chance of following it.

I can't believe this video was 25 minutes long, it flew by. Great idea, execution and presentation. I need to up my geek game!

Always a pleasure Tom

@kevinpaz3142

7 жыл бұрын

mick maus I saw what date it was and thought "Hey, Sigbovik (sic) is tomorrow, wonder if Tom7 got anything?"

@tom7

7 жыл бұрын

Glad you enjoyed it and thanks for watching! (:

This is crazy! I love this project. (Edit after 10 min: Absolutely Love This)

Holy rickroll batman! Excellent video. I pondered showing this to my family because of how well you described the compilation process and get into the meat of assembling without making it complicated. Great stuff.

I must give credence to this video for the exquisite and elaborate way that it plays itself out, 10/10.

See you again in 6 months

@tom7

7 жыл бұрын

hehe cya!

@AdrianCastravete

7 жыл бұрын

OMG! Hahahaha, That totally “terminated” the thread.

@ThePharphis

6 жыл бұрын

Hi there

I had the duck tales theme stuck in my head all day, and here you are with that shirt. Not important, coincidence is statistically inevitable.

Awesome...love the concept and the fact you actually managed to get it all to work. I would be interested in seeing another video on the c compiler you wrote. I looked forward to your next video :D

INCREDIBLE! This is the kind of work that founds new words to describe the nature or kind of work. I feel like an executable, printable, fully paper-a-fileable thingie needs a new word to describe it.

Don't worry about the pace. I like this setup. A frosty pint, a drawing board, some pleasantly scratchy markers, and x86 assembly explained by someone who still cares. It's perfect. keep doin the thing also your doodles would kick my doodles dad's ass.

This thing is a masterpiece at the level of the orobouros quine. Astounding

I enjoyed this video way too much. More than expected. You hit the sweet spot in keeping both knowledgeable and newbie audiences, good job. Take my sub.

This is so cool. Hard to find good content like this.

YOU'RE SO SMART AND FUNNY AND GOOD AT EXPLAINING THINGS IN A FUN AND ENGAGING WAY I WANT TO BE YOU How did you become such a wizard?

@tom7

7 жыл бұрын

Thanks! :) I don't know if I have a short answer for that, but I can say that behind the scenes there's a lot of hard work and anxiety and struggling with motivation and so on. Of course I don't present that part, because it's not that fun to watch, but it's certainly not effortless!

@AssailantLF

7 жыл бұрын

As an aspiring and amateur developer myself, that's reassuring to hear (not to delight in your struggles ;P)! I worked through most of "C Programming: A Modern Approach" and then about 1/4th of the way through K&R before I got really stumped at some problem and lost my drive a few months ago. I guess it's as simple as getting back on the horse, and staying on until I tame that mofo. Sorry for fangasming, but you're definitely a wizard-tier developer and I can't help but be enthralled when I get a taste of the work that you do at the level you're at. Seeing your videos and people like you who are both intellectual and playfully fun is really inspiring, so thanks a ton for your content and explanations and just bein' a cool dude.

@velocityra

7 жыл бұрын

Starting an actual project you're interested in is a much better way to learn a programming, or a specific language. Books are only good as a reference IMO, programming is really one of those things that you have to actually *do* to learn it. You will forget most things you read from the book, whereas if you start an actual project, you'll remember more, you'll be more motivated, and it'll be way more fun experience overall.

@marksmod

7 жыл бұрын

smoke crack

@josephroblesjr.8944

3 жыл бұрын

@@marksmod lol

As a security professional (but not a programmer yet), I imagine this concept could be used to hide payloads in viruses. It could even help social engineers breach firewalls. Very interesting.

@CrushedAsian255

Жыл бұрын

I think ASCII shell code is an actual thing

I was just waiting for you to mention self-modifying code, such that you would transform any executable (executable A) into a printable executable (executable A') that would reproduce executable A in memory and then jump to it. But then I noticed that you explicitly forswore the use of self-modifying code, because that would be too easy or something. Hats off to you, my good sir, then!

I love how this is just barely possible, yet you make it work anyways. Your videos are very inspiring

@tom7

Ай бұрын

Survivor bias at work!

You, sir, are a genius.

OH SHIT HE'S BACK

You're a cool person, I hope to see more content of this nature on your channel in the future. Awesome work!

Thanks for that bit about llvm c compiler, it's godsend right now. Always was curious about it, but never took time to properly learn it.

That is the hardest rickroll ever my friend.

Why is the compiler a toilet though?

@Architector_4

7 жыл бұрын

Why not? He drew it really nicely, actually .-.

@tom7

7 жыл бұрын

It is a totally obscure in-joke for a few friends, relating to this cartoon: www.cs.cmu.edu/~tom7/csnotes/spring03/compiler-time.gif

@gafeht

7 жыл бұрын

oh god lol

@Architector_4

7 жыл бұрын

Woah, removing "compiler-time.gif" from the end of that link reveals more images... That my brain can't make any logical sense of... ._.

@TimoSluis

7 жыл бұрын

It takes in some shit, does some magical things with it, and still comes out as something that sort of still represents what came into it

Amazing! Thanks for another humorous and fascinating video, Tom!

You have truly outdone yourself. So elegant.

At 9:10 ish, why can't we do (A & B) XOR (A XOR B)?

@gafeht

7 жыл бұрын

(1000) XOR (0110) = 1110... Seems to do the same thing in the same amount of steps (3)

@Architector_4

7 жыл бұрын

+gafeht But he said that we don't have + operation so he needed to make it with other stuff, so just putting XOR in the middle is actually better. Or maybe he knew about it and used + to demonstrate that he will need to make that + from other operations aswell.

@gafeht

7 жыл бұрын

+Architector #4 Ah, you're right. I missed that the second time through. Nice thinking +contrl31

@tom7

7 жыл бұрын

It's better for the narrative of the video to use plus, so I'm glad I did, but XOR is definitely faster. Fixed the compiler. A few people have pointed this out, and I'm kinda ashamed I didn't spot it. Good eyes :)

@CosmiaNebula

7 жыл бұрын

Don't worry. (I spotted that too.)

Very impressive presentation. You packed a fantastic amount of information and creativity into 25 minutes?

@tom7

7 жыл бұрын

Glad it came out okay (for you at least). I felt like it was really difficult to get through it all, since there was so much more to say about everything, and yet 25 minutes seems way too long to hold someone's attention? Thank you for watching :)

@MeriaDuck

3 жыл бұрын

@@tom7 you would've had my attention even if it was a few hours. See also Ben Eater

@raghavrao5221

3 жыл бұрын

@@tom7 To a very select audience your videos are like nerd crack

This guy put the most effort ever into a rickroll in a fun and creative way. I love it.

Only halfway through the video but I love that graph theory shows up here where you wouldn't really expect it to. Maybe it's pretty common when developing compiler, I don't have a ton of experience with that, but something about practical applications of graph theory is so intuitive and satisfying to me.

16:00 I love how HIS notion her of bad things to execute in case the EIP goes out of program, are non printable things... Not scary system breaking instructions that could be somewhere there xD

I was so hoping that your paper would actually be the compiler

This is honestly a master-piece.

Thoroughly amusing. Explained in expert mode as well.

Science, mathematics and Hyrule

As soon as he said it would play music I knew what was coming.

This channel is incredible. I will follow you forever

Excellent, man. Loved all of the puzzle solving here, great work.

Fuck yes, new content

Longest set up for a Rick Roll I've seen

Love this project. Nice to see a new video from you

I loved every second of this. Very well explained demonstration of the most useless yet fascinating thing to do with your paper.

As a developer, I'm now wondering how often you ran this manually and rick-rolled yourself in the course of making this.

@tom7

7 жыл бұрын

Not to mention the times I subconsciously rickrolled myself from having it stuck in my head and humming it...

@darren8453

7 жыл бұрын

suckerpinch now I have it stuck in my head again!!!

16:56 That's not a typo (unless you'd like to show a counterexample). "fi" is a common way to end if statements. It even appears in bash (bourne again shell). Look, there's three of them. I do seem to see an error in the second "fi", though. It's indented incorrectly which makes the flow confusing. It should be indented eight more spaces inward to match the "IF EIP Actually, looking at it again, the shown psuedocode is a huge mess. Given what I can make of the syntax without any context, and removing ugly GNU-isms[1], it should be: IF condition THEN EIP := EIP + SignExtend(DEST); IF OperandSize = 16 THEN EIP := EIP AND 0000FFFFH; FI; (* IF OperandSize = 16 *) ELSE (* indented back for clarity; matches previous IF block; implied: OperandSize = 32 *) IF EIP CS.Limit THEN (* Logical and Bitwise operators using the same keywords? This language must be strongly-typed. *) #GP FI; (* IF EIP FI; (* ELSE (IF OperandSize = 16) *) FI; (* IF condition *) 1. GNU-ism: Horrible formatting choices made by maintainers of GNU software, e.g. using tabs instead of spaces, or putting the bracket on the next line and indenting it between the parent statement and body instead of aligning it with the parent or leaving it on the same line, which has the effect of making code bleed together and making it much harder to tell what indentation level any given line is at. And that latter example is usually combined with two-space indents or tabs. Example: if(cond) { do_stuff(); } Now imagine 5,000 lines of that and realize that GNU is not afraid to nest 6+ levels deep or write 400-line functions. Oh yeah, it's bad.

@yaroslavpanych2067

5 жыл бұрын

No dude, you actually failed here :D Why do you assume he is to aware of meaning of FI? He spent probably hundreds hours staring in this book. In this case, that particular FI in question is a error, it mustn't be there. Look into recent intel instruction set reference, you will find exactly this description, but correct - without first FI. It is just editor mistake.

@BradenBest

5 жыл бұрын

@@yaroslavpanych2067 So what you're saying is that not only is it my fault that he pointed to the FI, called it a typo, and didn't clarify what he was referring to, but I was somehow supposed to know, without any context, that by "typo", he was referring to a structural logic error and not a spelling/indentation error? So it's safe to assume, then, that if I show you a random snippet of code without any context, I can expect you to know everything about that snippet of code just from looking at it? Well that's just unrealistic.

@BradenBest

5 жыл бұрын

@@yaroslavpanych2067 Or are you saying that the FI is an error because it precedes the matching ELSE? That is an unreasonable assumption to make without a visible counterexample to show that self-consistency has been compromised. There is no other example in that snippet of an if/else compound, so it's safe to assume that 'FI' is analogous to '}' from C-like languages. What I am claiming: IF cond THEN ... FI; IF cond THEN ... FI; ELSE ... FI; are analogous to if (cond) { ... } if (cond) { ... } else { ... } and are thus perfectly valid. And I claim this without the context of the entire book to show any counter examples. There is only the snippet in the video, and what is visible in that moment in time. Therefore, this is what I can _reasonably_ conclude with the given information. The problem here is that the guy in the video does NOT attempt to show any counter examples or explain why what he's pointing at is a typo. Instead, he just claims its a typo, and, again without any context, all I can _reasonably_ conclude with the given information is that he must be unfamiliar with "fi" and just said it was a typo in the moment. You, on the other hand, are making conclusions that may be drawn from outside information or speculation, conclusions that are specifically not supported by the visible snippet. Therefore, it is unreasonable to claim that I "failed", just as it would be unreasonable to claim that Einstein "failed" in the event that some future discovery demonstrates a massive hole in general relativity. In fact, given what can be known from the visible snippet, I can go so far as to say that my assertion was _ostensibly correct,_ as the innermost IF lacks a matching FI, which contradicts the rest of the visible pseudocode, and that therefore _you_ are the one who "failed". I'm not claiming you're wrong, but I _am_ claiming that your expectations are unreasonable. That said, I went ahead and edited the OP to be less matter of fact since I was also guilty of speculation.

@tom7

5 жыл бұрын

@@BradenBest The typo is that the FI; should not be there. It isn't used to end THEN clauses in the book (I think this syntax would be problematic because it would then be ambiguous whether a following ELSE went with that IF or a containing one, which seems contrary to the purpose of using FI in the first place). I wasn't trying to explain the error in the video; I was simply trying to make the case that this stuff is tricky because even the official reference manuals are fallible.

@BradenBest

5 жыл бұрын

@@tom7 As crappy as 'IF THEN FI ELSE FI' would be (versus IF THEN ELSE FI) design-wise, I have to disagree on the point about ambiguity: "I think this syntax would be problematic because it would then be ambiguous whether a following ELSE went with that IF or a containing one[...]" There is no ambiguity here. This is what I assume you must be thinking: IF A THEN IF B THEN do_thing_ab FI ELSE (does this match the inner or outer if?) do_thing_a FI ... But again, if FI is analogous to '}', and ends both if and else statements, then it can only mean one thing. IF A THEN (nest level 0->1) IF B THEN (1->2) do_thing_ab FI (2->1) ELSE *(matches inner if)* (1->2) do_thing_a FI (2->1) FI (ends outer if) (1->0) It's crappy, but it's not ambiguous. IF A THEN IF B THEN do_thing_ab FI ELSE (matches inner if) do_thing_a FI FI IF A THEN IF B THEN do_thing_ab FI FI ELSE (matches outer if) do_thing_c FI And the same things but with the THEN's replaced with {, FI's replaced with }, and the implicit open statement on each ELSE replaced with {: IF A { IF B { do_thing_ab } ELSE { do_thing_a } } IF A { IF B { do_thing_ab } } ELSE { do_thing_c }

This is such a fun idea, I love it! Great explanation and presentation too

I knew this video was gonna be good, and you never let me down!

EDIT: SPOILERS STOP READING COMMENTS BEFORE THE VIDEO ... original comment: This has got to be the most intense, in-depth rick roll I've ever seen...

@killmepls7865

5 жыл бұрын

Yeah god damn im shook

@nightchicken3517

3 жыл бұрын

Thank you for the warning

@kgallchobhair

3 жыл бұрын

Way to spoil it for every mobile user :c

@voxelfusion9894

3 жыл бұрын

@@kgallchobhair your fault for reading comments before the video.

@Damaniel3

3 жыл бұрын

Yep. Ran it in DOSbox before I even watched the video - wasn't expecting that.

I really wanted you to end the video by saying "cya!"

YOU'RE BACK

Watching this video made my brain light up like a christmas tree. Thank you, it was a pleasure to learn lots of new stuff.