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Initial import of Jolverine 1.0 sources.
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Jolverine | ||
========= | ||
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Language version 1.0 | ||
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The Jolverine language was devised as a conscious attempt to expand the | ||
genre of turning tarpit by adding the feature of modifying the instruction | ||
wheel during execution. It is not dissimilar to Wunnel, and was influenced | ||
slightly by Half-Broken Car in Heavy Traffic. | ||
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The name is either a portmanteau of "jolly wolverine" (where "jolly" is a | ||
euphemism for "drunk",) which is an attempt to capture, in a noun phrase, the | ||
language's vicious, erratic nature. | ||
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Program Structure | ||
----------------- | ||
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A Jolverine program consists of a two-dimensional grid of symbols. An | ||
instruction pointer (IP) traverses the grid, starting in the upper-left | ||
corner (x=0, y=0) travelling right (dx=1, dy=0). dx and dy have only | ||
three possible values, -1, 0, and 1, like values on the tape (see below.) | ||
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Execution | ||
--------- | ||
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On each tick, if the symbol under the IP is a `*`, the current instruction on | ||
the instruction wheel is executed. The instruction wheel is then advanced to | ||
the next instruction, regardless of what the symbols under the IP contains. | ||
(All symbols that are not `*` have the same meaning, that is to say, no | ||
meaning besides taking up space.) The IP is then advanced to the next | ||
position in the playfield, and the next tick begins. Execution halts when | ||
the IP travels beyond the extent of the playfield (i.e. when it can be proved | ||
that, in its direction of travel, it will never again hit a `*`.) | ||
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Storage | ||
------- | ||
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There is an unbounded tape, with a single head which can be moved left | ||
and right. Each cell on the tape may contain one of the three values -1, 0, | ||
or 1. Initially, all tape cells contain 0. Addition and subtraction of these | ||
values is always "mod 3 - 1": incrementing 1 yields -1 and decrementing -1 | ||
yields 1. | ||
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Instruction Wheel | ||
----------------- | ||
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The instruction wheel contains seven instructions. Initially, the wheel looks | ||
like this: | ||
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left <-- | ||
right | ||
rot | ||
adddx | ||
adddy | ||
input | ||
output | ||
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The arrow indicates the current instruction on the wheel. Each time the | ||
wheel is advanced, the arrow moves down one row, wrapping around back | ||
to the top once it advances past the bottom of the wheel. | ||
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Each time an instruction is executed from the wheel, it is removed from the | ||
wheel and re-inserted at a different position. The first time this happens, it | ||
is re-inserted at the top of the wheel; the second time, it is re-inserted at | ||
the bottom; the third time, at the top again; the fourth time, at the bottom | ||
again; and so forth. | ||
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Instructions | ||
------------ | ||
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* `left`: moves the tape head left one tape cell. | ||
* `right`: moves the tape head right one tape cell. | ||
* `rot`: increments the current tape cell. | ||
* `adddx`: adds the contents of the current tape cell to the IP's dx. | ||
* `adddy`: adds the contents of the current tape cell to the IP's dy. | ||
* `input`: inputs a single bit (I/O is bitwise, and implementation-defined.) | ||
* `output`: if the current tape cell is 0, output a 0; if the current tape | ||
cell is 1, output a 1; otherwise RESERVED for future expansion. | ||
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Notes | ||
----- | ||
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It is entirely possible for `*` to execute `adddx` or `adddy` with the result | ||
of both dx and dy being zero. In this case, execution does not halt, but | ||
the same `*` will be executed again, and again, until dx or dy changes. | ||
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Computational Class | ||
------------------- | ||
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Jolverine may or may not be Turing-complete. If it is not, it is not because | ||
it has insufficient storage, or no way to execute an instruction it has | ||
previously executed; it will be because there is no way to predictably | ||
execute the same series of instructions as was previously executed. | ||
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Discussion | ||
---------- | ||
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I have yet to write a proper loop in Jolverine. I have only attempted to | ||
write an infinite loop, executing `adddx` and `adddy` alternately after | ||
`rot`ing a cell on the tape. After a few iterations, you can guarantee | ||
that `adddx` is at the top of the wheel, and `adddy` at the bottom, so you | ||
can choose to execute the next one, as appropriate, and it will not change | ||
the position of these instructions on the wheel (because they're already at | ||
the top and bottom.) However, I suspect even this technique really requires | ||
some number theory to do effectively -- probably finding the LCM of 7 (the | ||
number of instructions on the wheel) and a couple of other numbers (the | ||
amount you can change the x and y positions on each spin around the | ||
playfield.) | ||
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Happy wheel-mangling! | ||
Chris Pressey | ||
September 11, 2012 | ||
Montréal, Québec |
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This is free and unencumbered software released into the public domain. | ||
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Anyone is free to copy, modify, publish, use, compile, sell, or | ||
distribute this software, either in source code form or as a compiled | ||
binary, for any purpose, commercial or non-commercial, and by any | ||
means. | ||
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In jurisdictions that recognize copyright laws, the author or authors | ||
of this software dedicate any and all copyright interest in the | ||
software to the public domain. We make this dedication for the benefit | ||
of the public at large and to the detriment of our heirs and | ||
successors. We intend this dedication to be an overt act of | ||
relinquishment in perpetuity of all present and future rights to this | ||
software under copyright law. | ||
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | ||
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | ||
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. | ||
IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR | ||
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | ||
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | ||
OTHER DEALINGS IN THE SOFTWARE. | ||
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For more information, please refer to <http://unlicense.org/> |
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--*-* | ||
\ | ||
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\ * | ||
\ / | ||
\ / | ||
\ / | ||
* / | ||
\ / | ||
*-*---* |
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--*----------------------* | ||
\ | ||
* *------------*\ | ||
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* |
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--*----------------------* | ||
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--*----------------------* | ||
\ | ||
*------------*\ | ||
*------------* \\ | ||
|*---------* \ \\ | ||
* / | \ \ \\ | ||
/ /| | \ \ \* | ||
/ * | | \ \ /\ | ||
* | | | \ \ / \ | ||
| | | | * \/ \ | ||
| | | | / /\ * | ||
| | | | / / * / | ||
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| * | | / / / / | ||
* | | | / / / / | ||
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* \* / * / / | ||
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\ X / | ||
\ / \ / | ||
\ / * | ||
* |
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