On 1/9/2013 11:53 AM, David Barbour wrote:
On Wed, Jan 9, 2013 at 9:37 AM, John Carlson yottz...@gmail.com
mailto:yottz...@gmail.com wrote:
I've been collecting references to game POLs on:
http://en.wikipedia.org/wiki/Domain-specific_entertainment_language
That's neat. I'll definitely peruse.
interesting...
my own language may loosely fit in there, being mostly developed in
conjunction with a 3D engine, and not particularly intended for
general-purpose programming tasks...
like, beyond just ripping off JS and AS3 and similar, has some amount of
specialized constructs mostly for 3D game related stuff (like
vector-math and similar).
well, and some just plain obscure stuff, ...
BTW: recently (mostly over the past few days), I went and wrote a
simplistic JIT for the thing (I have not otherwise had a working JIT for
several years).
it turns out if one factors out most of the hard-parts in advance,
writing a JIT isn't actually all that difficult (*1).
in my case it gave an approx 20x speedup, bringing it from around 60x
slower than C with (plain C) threaded code, to around 3x slower than C,
or at least for my selection-sort test and similar... (the recursive
Fibonacci test is still fairly slow though, at around 240x slower than
C). as-is, it mostly just directly compiles a few misc things, like
arithmetic operators and variable loads/stores and similar, leaving most
everything else as call-threaded code (where the ASM code mostly just
directly calls C functions to carry out operations).
in the selection sort test, the goal is basically to sort an array using
selection sort. for a 64k element array, this is currently about 15s for
C, and around 49s for BS. with the interpreter, this operation takes
takes a good number of minutes.
*1:
current JIT, 1.2 kloc;
rest of core interpreter, 18 kloc;
rest of script interpreter (parser, front-end bytecode compiler, ...),
32 kloc;
VM runtime (dynamic typesystem, OO facilities, C FFI, ...) +
assembler/linker + GC: 291 kloc;
entire project, 1.32 Mloc.
so, yes, vs 291 kloc (or 1.32 Mloc), 1.2 kloc looks pretty small.
language rankings in project (excluding tools) by total kloc:
C (1.32 Mloc), BGBScript (16.33 kloc), C++ (16.29 kloc).
there may be some amount more script-code embedded in data files or
procedurally generated, but this is harder to measure.
or such...
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