-This is a list of changes between the released versions of LuaJIT.
-The current development version is LuaJIT 2.0.0-beta9.
-The current stable version is LuaJIT 1.1.7.
-
-Please check the -» Online Change History -to see whether newer versions are available. -
- -LuaJIT 2.0.0-beta9 — 2011-12-14
--
-
- New features:
-
-
-
- PPC port of LuaJIT is complete. Default is the dual-number port -(usually faster). Single-number port selectable via src/Makefile -at build time. -
- Add FFI callback support. -
- Extend -b to generate .c, .h or .obj/.o -files with embedded bytecode. -
- Allow loading embedded bytecode with require(). -
- From Lua 5.2: Change to '\z' escape. Reject undefined escape -sequences. -
- - Correctness and completeness:
-
-
-
- Fix OSX 10.7 build. Fix install_name and versioning on OSX. -
- Fix iOS build. -
- Install dis_arm.lua, too. -
- Mark installed shared library as executable. -
- Add debug option to msvcbuild.bat and improve error handling. -
- Fix data-flow analysis for iterators. -
- Fix forced unwinding triggered by external unwinder. -
- Record missing for loop slot loads (return to lower frame). -
- Always use ANSI variants of Windows system functions. -
- Fix GC barrier for multi-result table constructor (TSETM). -
- Fix/add various FOLD rules. -
- Add potential PHI for number conversions due to type instability. -
- Do not eliminate PHIs only referenced from other PHIs. -
- Correctly anchor implicit number to string conversions in Lua/C API. -
- Fix various stack limit checks. -
- x64: Use thread-safe exceptions for external unwinding (GCC platforms). -
- x64: Fix result type of cdata index conversions. -
- x64: Fix math.random() and bit.bswap() code generation. -
- x64: Fix lightuserdata comparisons. -
- x64: Always extend stack-passed arguments to pointer size. -
- ARM: Many fixes to code generation backend. -
- PPC/e500: Fix dispatch for binop metamethods. -
- PPC/e500: Save/restore condition registers when entering/leaving the VM. -
- PPC/e500: Fix write barrier in stores of strings to upvalues. -
- - FFI library:
-
-
-
- Fix C comment parsing. -
- Fix snapshot optimization for cdata comparisons. -
- Fix recording of const/enum lookups in namespaces. -
- Fix call argument and return handling for I8/U8/I16/U16 types. -
- Fix unfused loads of float fields. -
- Fix ffi.string() recording. -
- Save GetLastError() around ffi.load() and symbol -resolving, too. -
- Improve ld script detection in ffi.load(). -
- Record loads/stores to external variables in namespaces. -
- Compile calls to stdcall, fastcall and vararg functions. -
- Treat function ctypes like pointers in comparisons. -
- Resolve __call metamethod for pointers, too. -
- Record C function calls with bool return values. -
- Record ffi.errno(). -
- x86: Fix number to uint32_t conversion rounding. -
- x86: Fix 64 bit arithmetic in assembler backend. -
- x64: Fix struct-by-value calling conventions. -
- ARM: Ensure invocation of SPLIT pass for float conversions. -
- - Structural and performance enhancements:
-
-
-
- Display trace types with -jv and -jdump. -
- Record isolated calls. But prefer recording loops over calls. -
- Specialize to prototype for non-monomorphic functions. Solves the -trace-explosion problem for closure-heavy programming styles. -
- Always generate a portable vmdef.lua. Easier for distros. -
-
LuaJIT 2.0.0-beta8 — 2011-06-23
--
-
- New features:
-
-
-
- Soft-float ARM port of LuaJIT is complete. -
- Add support for bytecode loading/saving and -b command line -option. -
- From Lua 5.2: __len metamethod for tables -(disabled by default). -
- - Correctness and completeness:
-
-
-
- ARM: Misc. fixes for interpreter. -
- x86/x64: Fix bit.* argument checking in interpreter. -
- Catch early out-of-memory in memory allocator initialization. -
- Fix data-flow analysis for paths leading to an upvalue close. -
- Fix check for missing arguments in string.format(). -
- Fix Solaris/x86 build (note: not a supported target). -
- Fix recording of loops with instable directions in side traces. -
- x86/x64: Fix fusion of comparisons with u8/u16 -XLOAD. -
- x86/x64: Fix register allocation for variable shifts. -
- - FFI library:
-
-
-
- Add ffi.errno(). Save errno/GetLastError() -around allocations etc. -
- Fix __gc for VLA/VLS cdata objects. -
- Fix recording of casts from 32 bit cdata pointers to integers. -
- tonumber(cdata) returns nil for non-numbers. -
- Show address pointed to for tostring(pointer). -
- Print NULL pointers as "cdata<... *>: NULL". -
- Support __tostring metamethod for pointers to structs, too. -
- - Structural and performance enhancements:
-
-
-
- More tuning for loop unrolling heuristics. -
- Flatten and compress in-memory debug info (saves ~70%). -
-
LuaJIT 2.0.0-beta7 — 2011-05-05
--
-
- New features:
-
-
-
- ARM port of the LuaJIT interpreter is complete. -
- FFI library: Add ffi.gc(), ffi.metatype(), -ffi.istype(). -
- FFI library: Resolve ld script redirection in ffi.load(). -
- From Lua 5.2: package.searchpath(), fp:read("*L"), -load(string). -
- From Lua 5.2, disabled by default: empty statement, -table.unpack(), modified coroutine.running(). -
- - Correctness and completeness:
-
-
-
- FFI library: numerous fixes. -
- Fix type mismatches in store-to-load forwarding. -
- Fix error handling within metamethods. -
- Fix table.maxn(). -
- Improve accuracy of x^-k on x64. -
- Fix code generation for Intel Atom in x64 mode. -
- Fix narrowing of POW. -
- Fix recording of retried fast functions. -
- Fix code generation for bit.bnot() and multiplies. -
- Fix error location within cpcall frames. -
- Add workaround for old libgcc unwind bug. -
- Fix lua_yield() and getmetatable(lightuserdata) on x64. -
- Misc. fixes for PPC/e500 interpreter. -
- Fix stack slot updates for down-recursion. -
- - Structural and performance enhancements:
-
-
-
- Add dual-number mode (int/double) for the VM. Enabled for ARM. -
- Improve narrowing of arithmetic operators and for loops. -
- Tune loop unrolling heuristics and increase trace recorder limits. -
- Eliminate dead slots in snapshots using bytecode data-flow analysis. -
- Avoid phantom stores to proxy tables. -
- Optimize lookups in empty proxy tables. -
- Improve bytecode optimization of and/or operators. -
-
LuaJIT 2.0.0-beta6 — 2011-02-11
--
-
- New features:
-
-
-
- PowerPC/e500v2 port of the LuaJIT interpreter is complete. -
- Various minor features from Lua 5.2: Hex escapes in literals, -'\*' escape, reversible string.format("%q",s), -"%g" pattern, table.sort checks callbacks, -os.exit(status|true|false[,close]). -
- Lua 5.2 __pairs and __ipairs metamethods -(disabled by default). -
- Initial release of the FFI library. -
- - Correctness and completeness:
-
-
-
- Fix string.format() for non-finite numbers. -
- Fix memory leak when compiled to use the built-in allocator. -
- x86/x64: Fix unnecessary resize in TSETM bytecode. -
- Fix various GC issues with traces and jit.flush(). -
- x64: Fix fusion of indexes for array references. -
- x86/x64: Fix stack overflow handling for coroutine results. -
- Enable low-2GB memory allocation on FreeBSD/x64. -
- Fix collectgarbage("count") result if more than 2GB is in use. -
- Fix parsing of hex floats. -
- x86/x64: Fix loop branch inversion with trailing -HREF+NE/EQ. -
- Add jit.os string. -
- coroutine.create() permits running C functions, too. -
- Fix OSX build to work with newer ld64 versions. -
- Fix bytecode optimization of and/or operators. -
- - Structural and performance enhancements:
-
-
-
- Emit specialized bytecode for pairs()/next(). -
- Improve bytecode coalescing of nil constants. -
- Compile calls to vararg functions. -
- Compile select(). -
- Improve alias analysis, esp. for loads from allocations. -
- Tuning of various compiler heuristics. -
- Refactor and extend IR conversion instructions. -
- x86/x64: Various backend enhancements related to the FFI. -
- Add SPLIT pass to split 64 bit IR instructions for 32 bit CPUs. -
-
LuaJIT 2.0.0-beta5 — 2010-08-24
--
-
- Correctness and completeness:
-
-
-
- Fix trace exit dispatch to function headers. -
- Fix Windows and OSX builds with LUAJIT_DISABLE_JIT. -
- Reorganize and fix placement of generated machine code on x64. -
- Fix TNEW in x64 interpreter. -
- Do not eliminate PHIs for values only referenced from side exits. -
- OS-independent canonicalization of strings for non-finite numbers. -
- Fix string.char() range check on x64. -
- Fix tostring() resolving within print(). -
- Fix error handling for next(). -
- Fix passing of constant arguments to external calls on x64. -
- Fix interpreter argument check for two-argument SSE math functions. -
- Fix C frame chain corruption caused by lua_cpcall(). -
- Fix return from pcall() within active hook. -
- - Structural and performance enhancements:
-
-
-
- Replace on-trace GC frame syncing with interpreter exit. -
- Improve hash lookup specialization by not removing dead keys during GC. -
- Turn traces into true GC objects. -
- Avoid starting a GC cycle immediately after library init. -
- Add weak guards to improve dead-code elimination. -
- Speed up string interning. -
-
LuaJIT 2.0.0-beta4 — 2010-03-28
--
-
- Correctness and completeness:
-
-
-
- Fix precondition for on-trace creation of table keys. -
- Fix {f()} on x64 when table is resized. -
- Fix folding of ordered comparisons with same references. -
- Fix snapshot restores for multi-result bytecodes. -
- Fix potential hang when recording bytecode with nested closures. -
- Fix recording of getmetatable(), tonumber() and bad argument types. -
- Fix SLOAD fusion across returns to lower frames. -
- - Structural and performance enhancements:
-
-
-
- Add array bounds check elimination. -Oabc is enabled by default. -
- More tuning for x64, e.g. smaller table objects. -
-
LuaJIT 2.0.0-beta3 — 2010-03-07
--
-
- LuaJIT x64 port:
-
-
-
- Port integrated memory allocator to Linux/x64, Windows/x64 and OSX/x64. -
- Port interpreter and JIT compiler to x64. -
- Port DynASM to x64. -
- Many 32/64 bit cleanups in the VM. -
- Allow building the interpreter with either x87 or SSE2 arithmetics. -
- Add external unwinding and C++ exception interop (default on x64). -
- - Correctness and completeness:
-
-
-
- Fix constructor bytecode generation for certain conditional values. -
- Fix some cases of ordered string comparisons. -
- Fix lua_tocfunction(). -
- Fix cutoff register in JMP bytecode for some conditional expressions. -
- Fix PHI marking algorithm for references from variant slots. -
- Fix package.cpath for non-default PREFIX. -
- Fix DWARF2 frame unwind information for interpreter on OSX. -
- Drive the GC forward on string allocations in the parser. -
- Implement call/return hooks (zero-cost if disabled). -
- Implement yield from C hooks. -
- Disable JIT compiler on older non-SSE2 CPUs instead of aborting. -
- - Structural and performance enhancements:
-
-
-
- Compile recursive code (tail-, up- and down-recursion). -
- Improve heuristics for bytecode penalties and blacklisting. -
- Split CALL/FUNC recording and clean up fast function call semantics. -
- Major redesign of internal function call handling. -
- Improve FOR loop const specialization and integerness checks. -
- Switch to pre-initialized stacks. Avoid frame-clearing. -
- Colocation of prototypes and related data: bytecode, constants, debug info. -
- Cleanup parser and streamline bytecode generation. -
- Add support for weak IR references to register allocator. -
- Switch to compressed, extensible snapshots. -
- Compile returns to frames below the start frame. -
- Improve alias analysis of upvalues using a disambiguation hash value. -
- Compile floor/ceil/trunc to SSE2 helper calls or SSE4.1 instructions. -
- Add generic C call handling to IR and backend. -
- Improve KNUM fuse vs. load heuristics. -
- Compile various io.*() functions. -
- Compile math.sinh(), math.cosh(), math.tanh() -and math.random(). -
-
LuaJIT 2.0.0-beta2 — 2009-11-09
--
-
- Reorganize build system. Build static+shared library on POSIX. -
- Allow C++ exception conversion on all platforms -using a wrapper function. -
- Automatically catch C++ exceptions and rethrow Lua error -(DWARF2 only). -
- Check for the correct x87 FPU precision at strategic points. -
- Always use wrappers for libm functions. -
- Resurrect metamethod name strings before copying them. -
- Mark current trace, even if compiler is idle. -
- Ensure FILE metatable is created only once. -
- Fix type comparisons when different integer types are involved. -
- Fix getmetatable() recording. -
- Fix TDUP with dead keys in template table. -
- jit.flush(tr) returns status. -Prevent manual flush of a trace that's still linked. -
- Improve register allocation heuristics for invariant references. -
- Compile the push/pop variants of table.insert() and -table.remove(). -
- Compatibility with MSVC link /debug. -
- Fix lua_iscfunction(). -
- Fix math.random() when compiled with -fpic (OSX). -
- Fix table.maxn(). -
- Bump MACOSX_DEPLOYMENT_TARGET to 10.4 -
- luaL_check*() and luaL_opt*() now support
-negative arguments, too.
-This matches the behavior of Lua 5.1, but not the specification.
-
LuaJIT 2.0.0-beta1 — 2009-10-31
--
-
- This is the first public release of LuaJIT 2.0. -
- The whole VM has been rewritten from the ground up, so there's -no point in listing differences over earlier versions. -
LuaJIT 1.1.7 — 2011-05-05
--
-
- Added fixes for the -» currently known bugs in Lua 5.1.4. -
LuaJIT 1.1.6 — 2010-03-28
--
-
- Added fixes for the -» currently known bugs in Lua 5.1.4. -
- Removed wrong GC check in jit_createstate(). -Thanks to Tim Mensch. -
- Fixed bad assertions while compiling table.insert() and -table.remove(). -
LuaJIT 1.1.5 — 2008-10-25
--
-
- Merged with Lua 5.1.4. Fixes all -» known bugs in Lua 5.1.3. -
LuaJIT 1.1.4 — 2008-02-05
--
-
- Merged with Lua 5.1.3. Fixes all -» known bugs in Lua 5.1.2. -
- Fixed possible (but unlikely) stack corruption while compiling -k^x expressions. -
- Fixed DynASM template for cmpss instruction. -
LuaJIT 1.1.3 — 2007-05-24
--
-
- Merged with Lua 5.1.2. Fixes all -» known bugs in Lua 5.1.1. -
- Merged pending Lua 5.1.x fixes: "return -nil" bug, spurious count hook call. -
- Remove a (sometimes) wrong assertion in luaJIT_findpc(). -
- DynASM now allows labels for displacements and .aword. -
- Fix some compiler warnings for DynASM glue (internal API change). -
- Correct naming for SSSE3 (temporarily known as SSE4) in DynASM and x86 disassembler. -
- The loadable debug modules now handle redirection to stdout -(e.g. -j trace=-). -
LuaJIT 1.1.2 — 2006-06-24
--
-
- Fix MSVC inline assembly: use only local variables with -lua_number2int(). -
- Fix "attempt to call a thread value" bug on Mac OS X: -make values of consts used as lightuserdata keys unique -to avoid joining by the compiler/linker. -
LuaJIT 1.1.1 — 2006-06-20
--
-
- Merged with Lua 5.1.1. Fixes all -» known bugs in Lua 5.1. -
- Enforce (dynamic) linker error for EXE/DLL version mismatches. -
- Minor changes to DynASM: faster pre-processing, smaller encoding -for some immediates. -
-This release is in sync with Coco 1.1.1 (see the -» Coco Change History). -
- -LuaJIT 1.1.0 — 2006-03-13
--
-
- Merged with Lua 5.1 (final). - -
- New JIT call frame setup:
-
-
-
- The C stack is kept 16 byte aligned (faster). -Mandatory for Mac OS X on Intel, too. -
- Faster calling conventions for internal C helper functions. -
- Better instruction scheduling for function prologue, OP_CALL and -OP_RETURN. -
-
- - Miscellaneous optimizations:
-
-
-
- Faster loads of FP constants. Remove narrow-to-wide store-to-load -forwarding stalls. -
- Use (scalar) SSE2 ops (if the CPU supports it) to speed up slot moves -and FP to integer conversions. -
- Optimized the two-argument form of OP_CONCAT (a..b). -
- Inlined OP_MOD (a%b). -With better accuracy than the C variant, too. -
- Inlined OP_POW (a^b). Unroll x^k or -use k^x = 2^(log2(k)*x) or call pow(). -
-
- - Changes in the optimizer:
-
-
-
- Improved hinting for table keys derived from table values -(t1[t2[x]]). -
- Lookup hinting now works with arbitrary object types and -supports index chains, too. -
- Generate type hints for arithmetic and comparison operators, -OP_LEN, OP_CONCAT and OP_FORPREP. -
- Remove several hint definitions in favour of a generic COMBINE hint. -
- Complete rewrite of jit.opt_inline module -(ex jit.opt_lib). -
-
- - Use adaptive deoptimization:
-
-
-
- If runtime verification of a contract fails, the affected -instruction is recompiled and patched on-the-fly. -Regular programs will trigger deoptimization only occasionally. -
- This avoids generating code for uncommon fallback cases -most of the time. Generated code is up to 30% smaller compared to -LuaJIT 1.0.3. -
- Deoptimization is used for many opcodes and contracts:
-
-
-
- OP_CALL, OP_TAILCALL: type mismatch for callable. -
- Inlined calls: closure mismatch, parameter number and type mismatches. -
- OP_GETTABLE, OP_SETTABLE: table or key type and range mismatches. -
- All arithmetic and comparison operators, OP_LEN, OP_CONCAT, -OP_FORPREP: operand type and range mismatches. -
- - Complete redesign of the debug and traceback info -(bytecode ↔ mcode) to support deoptimization. -Much more flexible and needs only 50% of the space. -
- The modules jit.trace, jit.dumphints and -jit.dump handle deoptimization. -
-
- - Inlined many popular library functions
-(for commonly used arguments only):
-
-
-
- Most math.* functions (the 18 most used ones) -[2x-10x faster]. -
- string.len, string.sub and string.char -[2x-10x faster]. -
- table.insert, table.remove and table.getn -[3x-5x faster]. -
- coroutine.yield and coroutine.resume -[3x-5x faster]. -
- pairs, ipairs and the corresponding iterators -[8x-15x faster]. -
-
- - Changes in the core and loadable modules and the stand-alone executable:
-
-
-
- Added jit.version, jit.version_num -and jit.arch. -
- Reorganized some internal API functions (jit.util.*mcode*). -
- The -j dump output now shows JSUB names, too. -
- New x86 disassembler module written in pure Lua. No dependency -on ndisasm anymore. Flexible API, very compact (500 lines) -and complete (x87, MMX, SSE, SSE2, SSE3, SSSE3, privileged instructions). -
- luajit -v prints the LuaJIT version and copyright -on a separate line. -
-
- - Added SSE, SSE2, SSE3 and SSSE3 support to DynASM. -
- Miscellaneous doc changes. Added a section about -embedding LuaJIT. -
-This release is in sync with Coco 1.1.0 (see the -» Coco Change History). -
-LuaJIT 1.0.3 — 2005-09-08
--
-
- Even more docs. -
- Unified closure checks in jit.*. -
- Fixed some range checks in jit.util.*. -
- Fixed __newindex call originating from jit_settable_str(). -
- Merged with Lua 5.1 alpha (including early bug fixes). -
-This is the first public release of LuaJIT. -
- -LuaJIT 1.0.2 — 2005-09-02
--
-
- Add support for flushing the Valgrind translation cache
-(MYCFLAGS= -DUSE_VALGRIND).
- - Add support for freeing executable mcode memory to the mmap()-based -variant for POSIX systems. -
- Reorganized the C function signature handling in -jit.opt_lib. -
- Changed to index-based hints for inlining C functions. -Still no support in the backend for inlining. -
- Hardcode HEAP_CREATE_ENABLE_EXECUTE value if undefined. -
- Misc. changes to the jit.* modules. -
- Misc. changes to the Makefiles. -
- Lots of new docs. -
- Complete doc reorg. -
-Not released because Lua 5.1 alpha came out today. -
- -LuaJIT 1.0.1 — 2005-08-31
--
-
- Missing GC step in OP_CONCAT. -
- Fix result handling for C –> JIT calls. -
- Detect CPU feature bits. -
- Encode conditional moves (fucomip) only when supported. -
- Add fallback instructions for FP compares. -
- Add support for LUA_COMPAT_VARARG. Still disabled by default. -
- MSVC needs a specific place for the CALLBACK attribute -(David Burgess). -
- Misc. doc updates. -
-Interim non-public release. -Special thanks to Adam D. Moss for reporting most of the bugs. -
- -LuaJIT 1.0.0 — 2005-08-29
--This is the initial non-public release of LuaJIT. -
--