same author wrote a 50 language quine:
https://github.com/mame/quine-relay
Radiation-hardened quine
71–76 of 76 posts
Re: Radiation-hardened quine
#72Interesting! Does anyone know of a language or operating system that uses Reed–Solomon error correction on every file? https://en.wikipedia.org/wiki/Reed–Solomon_error_correction Or to top that, imagine a computer where the entire memory space, perhaps shared with persistent flash memory, was encoded in this manner, so that even the filesystem was protected against bit flips. When I was doing Mac repair a few years b…
In safety-related system you usually don't try to correct bit flips (at least in my niche), but you've got lots and lots of mechanisms ensuring that bit flips are discovered. Even more, hardware faults like stuck-at bits and so on need to be discovered, as well. The downside is that all those checks are slow .
For more info on this search for "defensive programming", "Immunity-aware programming" and "preventitive programming". Several hardware companies have manuals/rules for programming in harsh environments.
Even if you're not into hardware it's worth a look, lots of cool tips.
Re: Radiation-hardened quine
#73I looked at his git profile, I recognised the name: Yusuke Endoh - multiple IOCCC winner. Here is one of my favourites:
Re: Radiation-hardened quine
#74Earlier quoted context omitted.
The Japanese use Chinese characters. The Japanese also have alphabets. (At least two.) But Chinese characters aren't exactly an alphabet and the Japanese don't use Chinese characters directly as an alphabet, though many characters are based on Chinese ones.
Since we're being technical, Japanese does not have any alphabet as such; an alphabet has, by definition, a 1 to 1 correspondence between a single character and a sound. Japanese uses syllabaries ('kana' in Japanese), where almost all characters represent more than 1 sound. Hiragana is typically used to write Japanese words and grammatical particles, while katakana is typically used to write foreign words and for spe…
Continuing on,
Spoken Japanese and Chinese have little to no relation, except for Chinese words imported into Japanese.
Hiragana, however, is derived from Chinese characters thousands of years ago. The Chinese characters were used in Japanese writing to write words phonetically.
Re: Radiation-hardened quine
#75I can't read this code at all, but, does this code basically contain the same code twice, so if something from the first half is removed the second half saves it?
Yes, and I was thoroughly disappointed by this result. So - new challenge: a radiation hardened quine in less than two times the characters of the equivalent non-radiation hardened version.
Re: Radiation-hardened quine
#76i wonder how far this can be taken... e.g. flipping or setting a random string of bits that would be physically contiguous in hardware as if a real neutron came smashing into the memory... if doing it during run can be achieved etc. how about a real native app with instructions? i'd never expect something as high level and wooly as ruby in systems that will be exposed to radiation. that's just asking for failure imo.…
A friend of mine writes firmware for embedded devices like automatic door controls. Besides having very well designed and redundant hardware (multiple PSUs etc.) the software does a lot of things to keep itself running robustly. For example, the microcontroller regularly tests its own memory for bad blocks and compensates accordingly - similiar to what flash memory controllers do. So yeah, even if you don't go into s…
thats interesting to know... i think you misunderstand me though. neutrons rain down on your hardware right now from deep space with significant energies... nuclear reactors aside.
this is the primary reason afaik for things like ecc and encasing your hardware in boro-silicate glass...