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'

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