Show HN: Online C/C++ to assembly visualizer [Weekend Project]

http://assembly.ynh.io/

by ynh • 14 years ago

149 44 14 years ago

assembly.ynh.io

Nice project. Will be more useful if there is an explanation of code generated. For example, making the various assembly instructions clickable and displaying information about them. Also a tiny bit of explanation about code and data sections might be of help too :)

ynh11• 14 years ago

Ok added to the todo list

wutwot• 14 years ago

You don't filter out CPP macro's. I would skip that and only allow C code. Or run this thing in a proper jail because at the moment:

- doing an include #include "/dev/random" will block the thread. - including "/etc/passwd" is also possible although I don't see a direct way to turn this into password disclosure.

Seriously; even if it's a weekend project, letting people run all kinds of potentially bad code on your machine is never a good idea. Even though you don't run the binaries yourself there's so many ways to mess around with a compiler. You just don't know what's going to happen.

Ubiquite• 14 years ago

I could have made the same comment. Good project, could be useful to me. A peace of asm documentation would be tasty.

alpb• 14 years ago

Try this on iPad. Generated assembly looks very bad in terms of layout.

Zenst• 14 years ago

Apple safari browser? Is it also the case with opera or Chrome on the iPad?

jurre• 14 years ago

I would guess it will be the same, Chrome on iPad is basically just an iOS webkit wrapper

icefox• 14 years ago

And you can't load any of the examples

berkut2• 14 years ago

Side by side would be a better layout like: http://gcc.godbolt.org/

vvnraman• 14 years ago

This really removes any hurdle I might have of inspecting the assembly code due to sheer laziness of opening up my Visual Studio and start debugging. Awesome work. If you add some type of interactivity to the generated assembly, it can be made more visual.

mappu• 14 years ago

Can i recommend adding -masm=intel to your gcc flags? I know AT&T syntax is the default for gcc and gas, but not why. Intel syntax seems clearer to read and is used by most assembly tutorials.

ynh11• 14 years ago

OK I will let the user choose between both syntax

winter_blue• 14 years ago

This could be a great educational tool! It could be used to teach Introductory Computer Organization at the college level.

I have a suggestion:

- Would you be able to separate the web interface, so that it could used to display Java -> JVM assembly, or any other language. Basically, so that it would be re-usable.

- Putting this up on GitHub would be great.

Finally, great work for just a weekend!

ynh11• 14 years ago

The code is available on github https://github.com/ynh/cpp-to-assembly

tisme• 14 years ago

Very neat! Suggestion: add a 'flags' field where you can specify stuff like -std=c99 and any other flags you might need for your code to compile, and a horizontal rule or something like that after every line of input code.

If you do the 'flags' thing make sure you filter it to avoid escapes to the underlying shell.

unix-dude• 14 years ago

Definitely interesting! Lots of us unix people would just run objdump -d for a quick ASM extraction, but this is probably much friendlier to the user just starting to learn C/ASM.

Overall, Good Job!

ajhai• 14 years ago

Interesting project. As an improvement to the UI, you can consider adding syntax highlighting to the editor. Take a look at ACE editor (http://ace.ajax.org/).

daurnimator• 14 years ago

Error: Command failed: /bin/sh: 1: c-preload/compiler-wrapper: Permission denied

xymostech• 14 years ago

I'm getting this too.

ynh11• 14 years ago

Fixed

gtklocker• 14 years ago

Error: Command failed: /tmp/test969394043.c:1:0: fatal error: can’t open /root/assembler/ccMEBJ3B.s for writing: Permission denied compilation terminated. The bug is not reproducible, so it is likely a hardware or OS problem.

Really.

ynh11• 14 years ago

Just fixed

jrajav• 14 years ago

Silently fails if you make a syntax error. I accidentally pasted this without newlines and at first I thought it wasn't responding:

  #include <stdio.h>int main() { printf("Hello World"); }

b3b0p• 14 years ago

I love it!

My only suggestion right now is to have it so you can have the assembly on the left or right side. Maybe it's just me, but my focus seems to be on the left side more than the right.

Since this is a focused on assembly it seems, wouldn't you want the focus on the assembly, not the C? It could be different for different people though.

munin• 14 years ago

LLVM has a similar page: http://llvm.org/demo

you can compile C/C++ to LLVM IR and also 32 or 64 bit intel assembler. you can also see the effects of different optimizations, etc

akavi• 14 years ago

Does anyone have a link to a good beginner's guide explaining the output?

Aardwolf• 14 years ago

In the hello world example, no matter what text you put there, the assembly is the same. Where does the string content go?

berkut2• 14 years ago

Static data in the binary.

bostko• 14 years ago

Can't you add a function for memorizing the code written?

Thank you!

ynh11• 14 years ago

Yes I could add some thing like a permanent link creator.

pgbovine• 14 years ago

excellent -- my unsolicited advice is for you to ping some professors and TAs who teach low-level programming to get them interested in using this in their teaching.

jheriko• 14 years ago

don't work really - some guidance on use might be acceptable. does it need to be a whole program? my snippets give confusing errors about variable identifiers not being types o_0

ynh11• 14 years ago

It must be a valid c/c++ program. Just wrap your code in a function

erichocean• 14 years ago

It'd be nice to make, e.g. the for loop clickable, so that it "stuck" and you could scroll down and see where it ended.

As it is now, as soon as you move your mouse, it unhighlights.

Show HN: Online C/C++ to assembly visualizer [Weekend Project]

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