Moonjit Files

Moonjit is a Just-In-Time Compiler (JIT) for the Lua programming language. Lua is a powerful, dynamic and light-weight programming language. It may be embedded or used as a general-purpose, stand-alone language.

The v2.2 release of moonjit brings many new features that bring the project closer to its aim of unifying LuaJIT forks and compatibility with Lua. Following are some major features implemented in this release.

Lua 5.2 extensions

The following Lua 5.2 functions and behaviours are now implemented in moonjit.

• lua_len
• lua_rawlen
• lua_absindex
• lua_pushglobal
• luaL_len
• luaL_getsubtable
• luaL_pushresultsize
• luaL_tolstring
• String matching patterns may contain \0 as a regular character.

Lua 5.3 extensions

The following Lua 5.3 functions and behaviours are now supported:

• string.pack, string.packsize and string.unpack
• math.maxinteger, max.mininteger, math.tointeger(x), math.type(x), math.ult(m, n) Note: moonjit 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. A future release may remedy this.
• utf8.char(...), utf8.charpattern, utf8.codepoints(s [, i [, j]]), utf8.codes(s), utf8.len(s [, i [, j]]), utf8.offset(s, n [, i])
• Lua/C API extensions: lua_isyieldable(), luaopen_utf8()

Faster string hashing

moonjit incorporates the fast CRC hash for string hashing from OpenResty's luajit2 to significantly speed up string hashing on platforms that support it, i.e. platforms with SSE4.2 support. Further, moonjit adds capability to detect SSE4.2 support at runtime and deploy the suitable hash function instead of having to recompile the binary.

OpenResty Extensions

The following OpenResty luajit extensions were incorporated into moonjit:

• thread.exdata to embedding user data into a thread (lua_State). This cannot be used by from within OpenResty context since it is used by OpenResty core.
• jit.prngstate to manage the PRNG state (a Lua number) used by the JIT compiler
• -bl flag for jit.dump to display the constant tables of each Lua prototype
• bytecode option L to display lua source line numbers
• Internal memory-buffer-based trace entry/exit/start-recording event logging, mainly for debugging bugs in the JIT compiler. it requires -DLUA_USE_TRACE_LOGS when building

Contributors

This release was made possible due to contributions from the following people:

• abhay1722
• Badger
• doujiang24
• Francois Perrad
• fsfod
• Girish Joshi
• Gustavo L F Walbon
• Guy Menanteau
• Johannes
• Julien Desgats
• ketank-new
• Luka Blaskovic
• Manuel BACHMANN
• mcc
• Michael Munday
• Mike Pall
• myfreeweb
• niravthakkar
• Patrick Galizia
• preetikhorjuvenkar
• Priya Seth
• Sameera Deshpande
• Shuxin Yang
• Siddhesh Poyarekar
• s.ostanevich
• Stefan Schulze Frielinghaus
• Thibault Charbonnier
• Vitaly Novichkov
• Vivien HENRIET
• Vyacheslav Egorov
• xiabin
• Yichun Zhang (agentzh)