Admin CliCours
Extrait du cours the virtual machine of lua 5.0
WHAT IS LUA ?
• Yet another scripting language
• Conventional syntax:
function fact (n)
if n == 0 then
return 1
else
return n * fact(n – 1)
end
end
function map (a, f)
local res = {}
for i, v in ipairs(a) do
res[i] = f(v)
end
return res
end
WHAT IS LUA ? ( CONT .)
• Associative arrays as single data structure
◦ first-class values
◦ any value allowed as index (not only strings)
◦ very efficient implementation
◦ syntactic sugar: a.x for a[« x »]
• Several not-so-conventional features
◦ first-class functions, lexical scoping, proper tail call, coroutines,
“dynamic overloading”
WHY LUA ?
• Light
◦ simple and small language, with few concepts
◦ core with approximately 60K, complete executable with 140K
• Portable
◦ written in “clean C”
◦ runs in PalmOS, EPOC (Symbian), Brew (Qualcomm), Playstation II, XBox, embedded systems, mainframes, etc.
• Efficient
◦ see benchmarks
• Easy to embed
◦ C/C++, Java, Fortran, Ruby, OPL (EPOC), C#
SOME APPLICATIONS
• Games
◦ LucasArts, BioWare, Microsoft, Relic Entertainment, Absolute Studios, Monkeystone Games, etc.
• Other Uses
◦ tomsrtbt – ”The most Linux on one floppy disk”
◦ Crazy Ivan Robot (champion of RoboCup 2000/2001 in Denmark)
◦ chip layouts (Intel)
◦ APT-RPM (Conectiva & United Linux)
◦ Space Shuttle Hazardous Gas Detection System (ASRC Aerospace)
VIRTUAL MACHINE
• Most virtual machines use a stack model
◦ heritage from Pascal p-code, followed by Java, etc.
………
Si le lien ne fonctionne pas correctement, veuillez nous contacter (mentionner le lien dans votre message)Cours the virtual machine of lua 5.0 (210 KO) (Cours PDF)
