my tiny LuaJIT 2.1 fork

Overview

I've worked in order to fill the compatibility gap between LuaJIT 2.1 and Lua 5.2/5.3/5.4.

Some of my Pull Requests were merged upstream by Mike Pall.

My unmerged work is available in the branch tiny_fork on https://github.com/fperrad/LuaJIT. It contains:

• PR#269 : backport string.*pack* from 5.3
• PR#327 : backport lua_rawlen, lua_len & luaL_len from 5.2
• PR#364 : patterns better compatibility with 5.2 ('\0' in pattern)
• optional utf8 modules (5.3 & 5.4 variants) (rework of PR#270)
• an optional math integer module (rework of PR#313)

Pull Requests

• PR#265 : backport package.searchers from 5.2

  status : Merged in v2.1.0-beta3

• PR#266 : io:read compat with 5.3

  status : Merged in v2.1.0-beta3

• PR#267 : backport table.move from 5.3

  status : Merged in v2.1.0-beta3 (fully reworked by Mike Pall)

• PR#268 : backport coroutine.isyieldable from 5.3

  status : Merged in v2.1.0-beta3

• PR#269 : backport string.*pack* from 5.3

  status : Rejected / Included in my fork

• PR#270 : backport utf8 library from 5.3

  status : Rejected / Reworked in my fork as optional Lua modules (5.3 & 5.4 variants)

• PR#273 : refactor table.maxn with LJLIB_LUA

  status : Rejected

• PR#302 : remove compatibility with Lua 5.0

  status : Merged in v2.1.0-beta3

• PR#307 : remove old compatibility macros

  status : Merged in v2.1.0-beta3

• PR#309 : package/module better compatibility with Lua 5.2

  status : Merged in v2.1.0-beta3

• PR#312 : backport operators from 5.3

  status : Pending (huge change, break bytecode compatibility, waiting for v2.2)

• PR#313 : backport math.type and math.tointeger from 5.3

  status : Rejected (incompatible numeric model) / Reworked in my fork as an optional Lua module

• PR#314 : backport some C/API from 5.2/5.3

  status : Merged in v2.1.0-beta3

• PR#315 : extract lib_coro from lib_base

  status : Rejected (break binary compatibility)

• PR#317 : add 5.3 operators as syntax sugar

  status : Bugged / needs some rework

• PR#327 : backport lua_rawlen, lua_len & luaL_len from 5.2

  status : Pending / Included in my fork

• PR#364 : patterns better compatibility with 5.2 ('\0' in pattern)

  status : Pending / Included in my fork

• PR#404 : add luaJIT_compat52 symbol

  status : Pending (no feedback)

• PR#423 : allow assert to take a table object as error

  status : Merged in v2.1.0-??? (fully reworked by Mike Pall)

• PR#525 : backport more C/API from 5.2/5.4

  status : Pending (no feedback)

• PR#590 : backport warning system from 5.4

  status : Rejected

• PR#591 : backport 31bits utf8 from lexico 5.4

  status : Rejected

Build / Install Instructions

From source, like with LuaJIT, see http://luajit.org/install.html.

Note: hererocks could be used like this :

$ hererocks somewhere --luajit https://github.com/fperrad/LuaJIT.git@tiny_fork --compat 5.2

Usage and Limitations

The optional utf8 module must be explicitly loaded by:

utf8 = require'compat53.utf8'

or

utf8 = require'compat54.utf8'

After require'compat53.math', the following functions and numbers are added in the math module:

• math.maxinteger
• math.mininteger
• math.tointeger (n)
• math.type (n)
• math.ult (m, n)

LuaJIT uses the same numeric type model as Lua 5.1 which is incompatible with Lua 5.3. As a result, these functions work only in the range [-2^53, 2^53]. math.maxinteger and math.mininteger thus give the limits of this range.

TODO

• Fix PR#317 : add 5.3 operators as syntax sugar