diff -Nru lua-5.5.0/Makefile lua-5.5.1/Makefile --- lua-5.5.0/Makefile 2025-06-26 10:04:37.000000000 -0300 +++ lua-5.5.1/Makefile 2026-07-14 15:25:18.594547846 -0300 @@ -36,7 +36,7 @@ # == END OF USER SETTINGS -- NO NEED TO CHANGE ANYTHING BELOW THIS LINE ======= # Convenience platforms targets. -PLATS= guess aix bsd c89 freebsd generic ios linux macosx mingw posix solaris +PLATS= guess aix bsd c89 freebsd generic ios linux linux-readline macosx mingw posix solaris # What to install. TO_BIN= lua luac @@ -46,7 +46,7 @@ # Lua version and release. V= 5.5 -R= $V.0 +R= $V.1 # Targets start here. all: $(PLAT) diff -Nru lua-5.5.0/README lua-5.5.1/README --- lua-5.5.0/README 2025-12-15 18:03:48.000000000 -0300 +++ lua-5.5.1/README 2026-07-15 17:29:58.617776036 -0300 @@ -1,5 +1,5 @@ -This is Lua 5.5.0, released on 15 Dec 2025. +This is Lua 5.5.1, released on 15 Jul 2026. For installation instructions, license details, and further information about Lua, see doc/readme.html. diff -Nru lua-5.5.0/doc/contents.html lua-5.5.1/doc/contents.html --- lua-5.5.0/doc/contents.html 2025-12-04 14:32:26.000000000 -0300 +++ lua-5.5.1/doc/contents.html 2026-07-13 18:19:59.669124761 -0300 @@ -32,7 +32,7 @@

-Copyright © 2020–2025 Lua.org, PUC-Rio. +Copyright © 2020–2026 Lua.org, PUC-Rio. Freely available under the terms of the Lua license. @@ -705,10 +705,10 @@

Last update: -Thu Dec 4 17:32:26 UTC 2025 +Mon Jul 13 21:19:58 UTC 2026

diff -Nru lua-5.5.0/doc/manual.html lua-5.5.1/doc/manual.html --- lua-5.5.0/doc/manual.html 2025-12-15 18:02:05.000000000 -0300 +++ lua-5.5.1/doc/manual.html 2026-07-15 17:19:12.878067499 -0300 @@ -19,7 +19,7 @@

-Copyright © 2020–2025 Lua.org, PUC-Rio. +Copyright © 2020–2026 Lua.org, PUC-Rio. Freely available under the terms of the Lua license. @@ -3263,7 +3263,21 @@

4.1.3 – Pointers to Strings

-Several functions in the API return pointers (const char*) +Several functions in the API have parameters +that are pointers to C strings (const char*). +Some of these parameters have an associated length (size_t). +Unless stated otherwise, +when there is an associated length, +the string can contain embedded zeros; +moreover, the pointer can be NULL if the length is zero. +When there is no associated length, +the pointer must point to a zero-terminated string. +In any case, the string contents should remain unchanged +until the function returns. + + +

+Several functions in the API also return pointers (const char*) to Lua strings in the stack. (See lua_pushfstring, lua_pushlstring, lua_pushstring, and lua_tolstring. @@ -4814,8 +4828,14 @@ This function creates and pushes on the stack a new full userdata, with nuvalue associated Lua values, called user values, plus an associated block of raw memory with size bytes. -(The user values can be set and read with the functions -lua_setiuservalue and lua_getiuservalue.) + + +

+The user values can be set and read with the functions +lua_setiuservalue and lua_getiuservalue. +The block of memory is suitably aligned for any ISO C object. +(See macro LUAI_MAXALIGN in file luaconf.h for other +alignment requirements.)

@@ -4869,8 +4889,10 @@

This function may raise an error if the given key is neither nil nor present in the table. -See function next for the caveats of modifying -the table during its traversal. + + +

+See function next for more details about the traversal. @@ -5540,7 +5562,7 @@ To start a coroutine, you push the main function plus any arguments onto the empty stack of the thread. -then you call lua_resume, +Then you call lua_resume, with nargs being the number of arguments. The function returns when the coroutine suspends, finishes its execution, or raises an unprotected error. @@ -5790,7 +5812,7 @@

lua_stringtonumber

-[-0, +1, –] +[-0, +(0|1), –] 

size_t lua_stringtonumber (lua_State *L, const char *s);

@@ -6241,7 +6263,7 @@ the execution of the C function that yielded (see §4.5). This continuation function receives the same stack from the previous function, -with the n results removed and +with all the results (nresults) removed and replaced by the arguments passed to lua_resume. Moreover, the continuation function receives the value ctx @@ -6342,7 +6364,7 @@

  • srclen: -The length of the string source. +the length of the string source.
  • short_src: @@ -6528,7 +6550,7 @@
  • 'S': -fills in the fields source, short_src, +fills in the fields source, srclen, short_src, linedefined, lastlinedefined, and what;
    • @@ -6759,7 +6781,9 @@

    -Parameters ar and n are as in the function lua_getlocal. +Parameters ar and n are as in the function lua_getlocal, +except that ar cannot be NULL, +as lua_setlocal only operates on activation records. @@ -8654,8 +8678,7 @@

    -See function next for the caveats of modifying -the table during its traversal. +See function next for more details about the traversal. @@ -11681,6 +11704,9 @@

    This library provides the functionality of the debug interface (§4.7) to Lua programs. + + +

    You should exert care when using this library. Several of its functions violate basic assumptions about Lua code @@ -11690,6 +11716,8 @@ that Lua programs do not crash) and therefore can compromise otherwise secure code. Moreover, some functions in this library may be slow. +It is good practice to always require this library explicitly +before using it.

    @@ -12306,6 +12334,11 @@

  • The word global is a reserved word. Do not use it as a regular name. + + +

    +The compilation option LUA_COMPAT_GLOBAL (see luaconf.h) +makes global a regular word.

  • @@ -12435,7 +12468,7 @@ local function Name funcbody | global function Name funcbody | local attnamelist [‘=’ explist] | - global attnamelist | + global attnamelist [‘=’ explist] | global [attrib] ‘*’ attnamelist ::= [attrib] Name [attrib] {‘,’ Name [attrib]} @@ -12499,10 +12532,10 @@

    Last update: -Mon Dec 15 21:02:05 UTC 2025 +Wed Jul 15 20:19:12 UTC 2026

    diff -Nru lua-5.5.0/doc/readme.html lua-5.5.1/doc/readme.html --- lua-5.5.0/doc/readme.html 2025-12-10 08:37:24.000000000 -0300 +++ lua-5.5.1/doc/readme.html 2026-07-13 18:20:34.956862199 -0300 @@ -109,7 +109,7 @@
    1. Open a terminal window and move to -the top-level directory, which is named lua-5.5.0. +the top-level directory, which is named lua-5.5.1. The Makefile there controls both the build process and the installation process.

    2. @@ -263,6 +263,7 @@

      Main changes

      • declarations for global variables +
      • named vararg tables
      • for-loop variables are read only
      • floats are printed in decimal with enough digits to be read back correctly.
      • more levels for constructors @@ -296,7 +297,7 @@ license page.
        -Copyright © 1994–2025 Lua.org, PUC-Rio. +Copyright © 1994–2026 Lua.org, PUC-Rio.

        Permission is hereby granted, free of charge, to any person obtaining a copy @@ -323,10 +324,10 @@

        Last update: -Wed Dec 10 11:37:23 UTC 2025 +Mon Jul 13 21:20:24 UTC 2026

        diff -Nru lua-5.5.0/src/Makefile lua-5.5.1/src/Makefile --- lua-5.5.0/src/Makefile 2025-07-06 21:19:14.000000000 -0300 +++ lua-5.5.1/src/Makefile 2026-07-15 17:17:33.493649641 -0300 @@ -30,7 +30,7 @@ # == END OF USER SETTINGS -- NO NEED TO CHANGE ANYTHING BELOW THIS LINE ======= -PLATS= guess aix bsd c89 freebsd generic ios linux macosx mingw posix solaris +PLATS= guess aix bsd c89 freebsd generic ios linux linux-readline macosx mingw posix solaris LUA_A= liblua.a CORE_O= lapi.o lcode.o lctype.o ldebug.o ldo.o ldump.o lfunc.o lgc.o llex.o lmem.o lobject.o lopcodes.o lparser.o lstate.o lstring.o ltable.o ltm.o lundump.o lvm.o lzio.o @@ -123,8 +123,11 @@ Linux linux: $(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_LINUX" SYSLIBS="-Wl,-E -ldl" +linux-readline: + $(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_LINUX -DLUA_USE_READLINE" SYSLIBS="-Wl,-E -ldl -lreadline" + Darwin macos macosx: - $(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_MACOSX -DLUA_USE_READLINE" SYSLIBS="-lreadline" + $(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_MACOSX" SYSLIBS="-lreadline" mingw: $(MAKE) "LUA_A=lua55.dll" "LUA_T=lua.exe" \ diff -Nru lua-5.5.0/src/lapi.c lua-5.5.1/src/lapi.c --- lua-5.5.0/src/lapi.c 2025-12-15 07:44:39.000000000 -0300 +++ lua-5.5.1/src/lapi.c 2026-07-15 17:17:08.227940150 -0300 @@ -187,7 +187,7 @@ api_check(L, idx <= ci->top.p - (func + 1), "new top too large"); diff = ((func + 1) + idx) - L->top.p; for (; diff > 0; diff--) - setnilvalue(s2v(L->top.p++)); /* clear new slots */ + setnilvalue2s(L->top.p++); /* clear new slots */ } else { api_check(L, -(idx+1) <= (L->top.p - (func + 1)), "invalid new top"); @@ -210,7 +210,7 @@ api_check(L, (L->ci->callstatus & CIST_TBC) && (L->tbclist.p == level), "no variable to close at given level"); level = luaF_close(L, level, CLOSEKTOP, 0); - setnilvalue(s2v(level)); + setnilvalue2s(level); lua_unlock(L); } @@ -366,7 +366,7 @@ } -LUA_API unsigned (lua_numbertocstring) (lua_State *L, int idx, char *buff) { +LUA_API unsigned lua_numbertocstring (lua_State *L, int idx, char *buff) { const TValue *o = index2value(L, idx); if (ttisnumber(o)) { unsigned len = luaO_tostringbuff(o, buff); @@ -513,7 +513,7 @@ LUA_API void lua_pushnil (lua_State *L) { lua_lock(L); - setnilvalue(s2v(L->top.p)); + setnilvalue2s(L->top.p); api_incr_top(L); lua_unlock(L); } @@ -570,7 +570,7 @@ LUA_API const char *lua_pushstring (lua_State *L, const char *s) { lua_lock(L); if (s == NULL) - setnilvalue(s2v(L->top.p)); + setnilvalue2s(L->top.p); else { TString *ts; ts = luaS_new(L, s); @@ -743,7 +743,7 @@ static int finishrawget (lua_State *L, lu_byte tag) { if (tagisempty(tag)) /* avoid copying empty items to the stack */ - setnilvalue(s2v(L->top.p)); + setnilvalue2s(L->top.p); api_incr_top(L); lua_unlock(L); return novariant(tag); @@ -836,7 +836,7 @@ o = index2value(L, idx); api_check(L, ttisfulluserdata(o), "full userdata expected"); if (n <= 0 || n > uvalue(o)->nuvalue) { - setnilvalue(s2v(L->top.p)); + setnilvalue2s(L->top.p); t = LUA_TNONE; } else { @@ -1122,6 +1122,7 @@ ZIO z; TStatus status; lua_lock(L); + luaC_checkGC(L); if (!chunkname) chunkname = "?"; luaZ_init(L, &z, reader, data); status = luaD_protectedparser(L, &z, chunkname, mode); @@ -1201,11 +1202,16 @@ case LUA_GCSTEP: { lu_byte oldstp = g->gcstp; l_mem n = cast(l_mem, va_arg(argp, size_t)); + l_mem newdebt; int work = 0; /* true if GC did some work */ g->gcstp = 0; /* allow GC to run (other bits must be zero here) */ if (n <= 0) - n = g->GCdebt; /* force to run one basic step */ - luaE_setdebt(g, g->GCdebt - n); + newdebt = 0; /* force to run one basic step */ + else if (g->GCdebt >= n - MAX_LMEM) /* no overflow? */ + newdebt = g->GCdebt - n; + else /* overflow */ + newdebt = -MAX_LMEM; /* set debt to miminum value */ + luaE_setdebt(g, newdebt); luaC_condGC(L, (void)0, work = 1); if (work && g->gcstate == GCSpause) /* end of cycle? */ res = 1; /* signal it */ diff -Nru lua-5.5.0/src/lauxlib.c lua-5.5.1/src/lauxlib.c --- lua-5.5.0/src/lauxlib.c 2025-12-15 07:44:39.000000000 -0300 +++ lua-5.5.1/src/lauxlib.c 2026-07-15 17:17:08.261939918 -0300 @@ -513,12 +513,25 @@ }; +/* +** Get/create metatable (MT) for boxes +*/ +static void getBoxMT (lua_State *L) { + const char *BOXMT = "_UBOX*"; /* key for the metatable */ + if (luaL_getmetatable(L, BOXMT) == LUA_TNIL) { /* MT not created yet? */ + luaL_newlibtable(L, boxmt); /* create it */ + luaL_setfuncs(L, boxmt, 0); /* initialize it */ + lua_copy(L, -1, -2); /* change stack from nil,MT to MT,MT */ + lua_setfield(L, LUA_REGISTRYINDEX, BOXMT); /* store MT in the registry */ + } +} + + static void newbox (lua_State *L) { UBox *box = (UBox *)lua_newuserdatauv(L, sizeof(UBox), 0); box->box = NULL; box->bsize = 0; - if (luaL_newmetatable(L, "_UBOX*")) /* creating metatable? */ - luaL_setfuncs(L, boxmt, 0); /* set its metamethods */ + getBoxMT(L); lua_setmetatable(L, -2); } @@ -874,7 +887,7 @@ LUALIB_API int luaL_loadstring (lua_State *L, const char *s) { - return luaL_loadbuffer(L, s, strlen(s), s); + return luaL_loadbufferx(L, s, strlen(s), s, "t"); } /* }====================================================== */ diff -Nru lua-5.5.0/src/lauxlib.h lua-5.5.1/src/lauxlib.h --- lua-5.5.0/src/lauxlib.h 2025-12-15 07:44:39.000000000 -0300 +++ lua-5.5.1/src/lauxlib.h 2026-07-15 17:17:08.330939447 -0300 @@ -81,8 +81,8 @@ LUALIB_API int (luaL_fileresult) (lua_State *L, int stat, const char *fname); LUALIB_API int (luaL_execresult) (lua_State *L, int stat); -LUALIB_API void *luaL_alloc (void *ud, void *ptr, size_t osize, - size_t nsize); +LUALIB_API void *(luaL_alloc) (void *ud, void *ptr, size_t osize, + size_t nsize); /* predefined references */ @@ -103,7 +103,7 @@ LUALIB_API lua_State *(luaL_newstate) (void); -LUALIB_API unsigned luaL_makeseed (lua_State *L); +LUALIB_API unsigned (luaL_makeseed) (lua_State *L); LUALIB_API lua_Integer (luaL_len) (lua_State *L, int idx); diff -Nru lua-5.5.0/src/lbaselib.c lua-5.5.1/src/lbaselib.c --- lua-5.5.0/src/lbaselib.c 2025-12-15 07:44:39.000000000 -0300 +++ lua-5.5.1/src/lbaselib.c 2026-07-15 17:17:08.347939330 -0300 @@ -340,9 +340,11 @@ static const char *getMode (lua_State *L, int idx) { - const char *mode = luaL_optstring(L, idx, "bt"); - if (strchr(mode, 'B') != NULL) /* Lua code cannot use fixed buffers */ + const char *mode = luaL_optstring(L, idx, NULL); + if (mode != NULL && strchr(mode, 'B') != NULL) { + /* Lua code cannot use fixed buffers */ luaL_argerror(L, idx, "invalid mode"); + } return mode; } @@ -364,33 +366,24 @@ /* -** reserved slot, above all arguments, to hold a copy of the returned -** string to avoid it being collected while parsed. 'load' has four -** optional arguments (chunk, source name, mode, and environment). -*/ -#define RESERVEDSLOT 5 - - -/* -** Reader for generic 'load' function: 'lua_load' uses the -** stack for internal stuff, so the reader cannot change the -** stack top. Instead, it keeps its resulting string in a -** reserved slot inside the stack. +** Reader for generic 'load' function. */ static const char *generic_reader (lua_State *L, void *ud, size_t *size) { - (void)(ud); /* not used */ + int *firstcall = cast(int *, ud); luaL_checkstack(L, 2, "too many nested functions"); + if (*firstcall) + *firstcall = 0; + else + lua_pop(L, 1); /* remove previous result */ lua_pushvalue(L, 1); /* get function */ lua_call(L, 0, 1); /* call it */ if (lua_isnil(L, -1)) { - lua_pop(L, 1); /* pop result */ *size = 0; return NULL; } else if (l_unlikely(!lua_isstring(L, -1))) luaL_error(L, "reader function must return a string"); - lua_replace(L, RESERVEDSLOT); /* save string in reserved slot */ - return lua_tolstring(L, RESERVEDSLOT, size); + return lua_tolstring(L, -1, size); } @@ -405,10 +398,10 @@ status = luaL_loadbufferx(L, s, l, chunkname, mode); } else { /* loading from a reader function */ + int firstcall = 1; /* userdata for generic_reader */ const char *chunkname = luaL_optstring(L, 2, "=(load)"); luaL_checktype(L, 1, LUA_TFUNCTION); - lua_settop(L, RESERVEDSLOT); /* create reserved slot */ - status = lua_load(L, generic_reader, NULL, chunkname, mode); + status = lua_load(L, generic_reader, &firstcall, chunkname, mode); } return load_aux(L, status, env); } @@ -425,7 +418,7 @@ static int luaB_dofile (lua_State *L) { const char *fname = luaL_optstring(L, 1, NULL); lua_settop(L, 1); - if (l_unlikely(luaL_loadfile(L, fname) != LUA_OK)) + if (l_unlikely(luaL_loadfilex(L, fname, "bt") != LUA_OK)) return lua_error(L); lua_callk(L, 0, LUA_MULTRET, 0, dofilecont); return dofilecont(L, 0, 0); diff -Nru lua-5.5.0/src/lcode.c lua-5.5.1/src/lcode.c --- lua-5.5.0/src/lcode.c 2025-12-15 07:44:39.000000000 -0300 +++ lua-5.5.1/src/lcode.c 2026-07-15 17:17:08.354939282 -0300 @@ -663,11 +663,11 @@ ** Add nil to list of constants and return its index. */ static int nilK (FuncState *fs) { - TValue k, v; - setnilvalue(&v); + lua_State *L = fs->ls->L; + TValue k; /* cannot use nil as key; instead use table itself */ - sethvalue(fs->ls->L, &k, fs->kcache); - return k2proto(fs, &k, &v); + sethvalue(L, &k, fs->kcache); + return k2proto(fs, &k, &G(L)->nilvalue); } @@ -827,7 +827,7 @@ } /* FALLTHROUGH */ case VLOCAL: { /* already in a register */ int temp = e->u.var.ridx; - e->u.info = temp; /* (can't do a direct assignment; values overlap) */ + e->u.info = temp; /* (avoid a direct assignment; values overlap) */ e->k = VNONRELOC; /* becomes a non-relocatable value */ break; } @@ -1365,7 +1365,7 @@ luaK_exp2anyreg(fs, t); /* put it in a register */ if (t->k == VUPVAL) { lu_byte temp = cast_byte(t->u.info); /* upvalue index */ - t->u.ind.t = temp; /* (can't do a direct assignment; values overlap) */ + t->u.ind.t = temp; /* (avoid a direct assignment; values overlap) */ lua_assert(isKstr(fs, k)); fillidxk(t, k->u.info, VINDEXUP); /* literal short string */ } @@ -1373,12 +1373,13 @@ int kreg = luaK_exp2anyreg(fs, k); /* put key in some register */ lu_byte vreg = cast_byte(t->u.var.ridx); /* register with vararg param. */ lua_assert(vreg == fs->f->numparams); - t->u.ind.t = vreg; /* (avoid a direct assignment; values may overlap) */ + t->u.ind.t = vreg; /* (avoid a direct assignment; values may overlap?) */ fillidxk(t, kreg, VVARGIND); /* 't' represents 'vararg[k]' */ } else { /* register index of the table */ - t->u.ind.t = cast_byte((t->k == VLOCAL) ? t->u.var.ridx: t->u.info); + lu_byte temp = cast_byte((t->k == VLOCAL) ? t->u.var.ridx: t->u.info); + t->u.ind.t = temp; /* (avoid a direct assignment; values may overlap?) */ if (isKstr(fs, k)) fillidxk(t, k->u.info, VINDEXSTR); /* literal short string */ else if (isCint(k)) /* int. constant in proper range? */ @@ -1933,8 +1934,6 @@ p->flag &= cast_byte(~PF_VAHID); /* then it will not use hidden args. */ for (i = 0; i < fs->pc; i++) { Instruction *pc = &p->code[i]; - /* avoid "not used" warnings when assert is off (for 'onelua.c') */ - (void)luaP_isOT; (void)luaP_isIT; lua_assert(i == 0 || luaP_isOT(*(pc - 1)) == luaP_isIT(*pc)); switch (GET_OPCODE(*pc)) { case OP_RETURN0: case OP_RETURN1: { diff -Nru lua-5.5.0/src/ldblib.c lua-5.5.1/src/ldblib.c --- lua-5.5.0/src/ldblib.c 2025-12-15 07:44:39.000000000 -0300 +++ lua-5.5.1/src/ldblib.c 2026-07-15 17:17:08.459938564 -0300 @@ -427,7 +427,7 @@ if (fgets(buffer, sizeof(buffer), stdin) == NULL || strcmp(buffer, "cont\n") == 0) return 0; - if (luaL_loadbuffer(L, buffer, strlen(buffer), "=(debug command)") || + if (luaL_loadbufferx(L, buffer, strlen(buffer), "=(debug command)", "t") || lua_pcall(L, 0, 0, 0)) lua_writestringerror("%s\n", luaL_tolstring(L, -1, NULL)); lua_settop(L, 0); /* remove eventual returns */ diff -Nru lua-5.5.0/src/ldebug.c lua-5.5.1/src/ldebug.c --- lua-5.5.0/src/ldebug.c 2025-12-15 07:44:39.000000000 -0300 +++ lua-5.5.1/src/ldebug.c 2026-07-15 17:17:08.473938468 -0300 @@ -291,7 +291,7 @@ static void collectvalidlines (lua_State *L, Closure *f) { if (!LuaClosure(f)) { - setnilvalue(s2v(L->top.p)); + setnilvalue2s(L->top.p); api_incr_top(L); } else { @@ -580,7 +580,7 @@ kname(p, k, name); return isEnv(p, lastpc, i, 1); } - case OP_GETTABLE: { + case OP_GETTABLE: case OP_GETVARG: { int k = GETARG_C(i); /* key index */ rname(p, lastpc, k, name); return isEnv(p, lastpc, i, 0); diff -Nru lua-5.5.0/src/ldo.c lua-5.5.1/src/ldo.c --- lua-5.5.0/src/ldo.c 2025-12-15 07:44:39.000000000 -0300 +++ lua-5.5.1/src/ldo.c 2026-07-15 17:17:08.493938332 -0300 @@ -221,13 +221,21 @@ /* -** Check whether stack has enough space to run a simple function (such -** as a finalizer): At least BASIC_STACK_SIZE in the Lua stack and -** 2 slots in the C stack. +** Check whether stacks have enough space to run a simple function (such +** as a finalizer): At least BASIC_STACK_SIZE in the Lua stack, two +** available CallInfos, and two "slots" in the C stack. */ int luaD_checkminstack (lua_State *L) { - return ((stacksize(L) < MAXSTACK - BASIC_STACK_SIZE) && - (getCcalls(L) < LUAI_MAXCCALLS - 2)); + if (getCcalls(L) >= LUAI_MAXCCALLS - 2) + return 0; /* not enough C-stack slots */ + if (L->ci->next == NULL && luaE_extendCI(L, 0) == NULL) + return 0; /* unable to allocate first ci */ + if (L->ci->next->next == NULL && luaE_extendCI(L, 0) == NULL) + return 0; /* unable to allocate second ci */ + if (L->stack_last.p - L->top.p >= BASIC_STACK_SIZE) + return 1; /* enough (BASIC_STACK_SIZE) free slots in the Lua stack */ + else /* try to grow stack to a size with enough free slots */ + return luaD_growstack(L, BASIC_STACK_SIZE, 0); } @@ -341,7 +349,7 @@ correctstack(L, oldstack); /* change offsets back to pointers */ L->stack_last.p = L->stack.p + newsize; for (i = oldsize + EXTRA_STACK; i < newsize + EXTRA_STACK; i++) - setnilvalue(s2v(newstack + i)); /* erase new segment */ + setnilvalue2s(newstack + i); /* erase new segment */ return 1; } @@ -422,12 +430,6 @@ luaE_shrinkCI(L); /* shrink CI list */ } - -void luaD_inctop (lua_State *L) { - L->top.p++; - luaD_checkstack(L, 1); -} - /* }================================================================== */ @@ -546,7 +548,7 @@ for (i = 0; i < nres; i++) /* move all results to correct place */ setobjs2s(L, res + i, firstresult + i); for (; i < wanted; i++) /* complete wanted number of results */ - setnilvalue(s2v(res + i)); + setnilvalue2s(res + i); L->top.p = res + wanted; /* top points after the last result */ } @@ -566,7 +568,7 @@ return; case 1 + 1: /* one value needed */ if (nres == 0) /* no results? */ - setnilvalue(s2v(res)); /* adjust with nil */ + setnilvalue2s(res); /* adjust with nil */ else /* at least one result */ setobjs2s(L, res, L->top.p - nres); /* move it to proper place */ L->top.p = res + 1; @@ -616,7 +618,7 @@ -#define next_ci(L) (L->ci->next ? L->ci->next : luaE_extendCI(L)) +#define next_ci(L) (L->ci->next ? L->ci->next : luaE_extendCI(L, 1)) /* @@ -686,7 +688,7 @@ setobjs2s(L, ci->func.p + i, func + i); func = ci->func.p; /* moved-down function */ for (; narg1 <= nfixparams; narg1++) - setnilvalue(s2v(func + narg1)); /* complete missing arguments */ + setnilvalue2s(func + narg1); /* complete missing arguments */ ci->top.p = func + 1 + fsize; /* top for new function */ lua_assert(ci->top.p <= L->stack_last.p); ci->u.l.savedpc = p->code; /* starting point */ @@ -733,7 +735,7 @@ L->ci = ci = prepCallInfo(L, func, status, func + 1 + fsize); ci->u.l.savedpc = p->code; /* starting point */ for (; narg < nfixparams; narg++) - setnilvalue(s2v(L->top.p++)); /* complete missing arguments */ + setnilvalue2s(L->top.p++); /* complete missing arguments */ lua_assert(ci->top.p <= L->stack_last.p); return ci; } @@ -1120,28 +1122,54 @@ } +/* +** Before the first call to the reader function, Lua reserves a slot +** with a table for anchoring stuff. +*/ static void f_parser (lua_State *L, void *ud) { LClosure *cl; struct SParser *p = cast(struct SParser *, ud); const char *mode = p->mode ? p->mode : "bt"; - int c = zgetc(p->z); /* read first character */ + int c; + Table *anchor; + ptrdiff_t otop = savestack(L, L->top.p); /* original top */ + luaD_checkstack(L, 2); + anchor = luaH_new(L); /* create the anchor table */ + sethvalue2s(L, L->top.p++, anchor); /* anchor the anchor table */ + c = zgetc(p->z); /* read first character */ if (c == LUA_SIGNATURE[0]) { int fixed = 0; if (strchr(mode, 'B') != NULL) fixed = 1; else checkmode(L, mode, "binary"); - cl = luaU_undump(L, p->z, p->name, fixed); + cl = luaU_undump(L, p->z, anchor, p->name, fixed); } else { checkmode(L, mode, "text"); - cl = luaY_parser(L, p->z, &p->buff, &p->dyd, p->name, c); + cl = luaY_parser(L, p->z, anchor, &p->buff, &p->dyd, p->name, c); } + L->top.p = restorestack(L, otop); /* restore stack */ + setclLvalue2s(L, L->top.p++, cl); /* push closure */ lua_assert(cl->nupvalues == cl->p->sizeupvalues); luaF_initupvals(L, cl); } +/* +** Anchor an object in a table in the stack. First, anchor the object +** temporarily in the stack, as luaH_set may call an emergency GC. +** Then, add it in the table with itself as its key. +*/ +void luaD_anchorobj (lua_State *L, Table *anchor, GCObject *obj) { + setgcovalue(L, s2v(L->top.p++), obj); /* temporary anchor in the stack */ + luaH_set(L, anchor, s2v(L->top.p - 1), s2v(L->top.p - 1)); + /* Because this is a new key, luaH_set will call the GC barrier, so + we don't need to call the barrier again here */ + L->top.p--; +} + + TStatus luaD_protectedparser (lua_State *L, ZIO *z, const char *name, const char *mode) { struct SParser p; diff -Nru lua-5.5.0/src/ldo.h lua-5.5.1/src/ldo.h --- lua-5.5.0/src/ldo.h 2025-12-15 07:44:39.000000000 -0300 +++ lua-5.5.1/src/ldo.h 2026-07-15 17:17:08.527938098 -0300 @@ -88,8 +88,8 @@ LUAI_FUNC int luaD_reallocstack (lua_State *L, int newsize, int raiseerror); LUAI_FUNC int luaD_growstack (lua_State *L, int n, int raiseerror); LUAI_FUNC void luaD_shrinkstack (lua_State *L); -LUAI_FUNC void luaD_inctop (lua_State *L); LUAI_FUNC int luaD_checkminstack (lua_State *L); +LUAI_FUNC void luaD_anchorobj (lua_State *L, Table *anchor, GCObject *obj); LUAI_FUNC l_noret luaD_throw (lua_State *L, TStatus errcode); LUAI_FUNC l_noret luaD_throwbaselevel (lua_State *L, TStatus errcode); diff -Nru lua-5.5.0/src/lgc.c lua-5.5.1/src/lgc.c --- lua-5.5.0/src/lgc.c 2025-12-15 07:44:39.000000000 -0300 +++ lua-5.5.1/src/lgc.c 2026-07-15 17:17:08.611937524 -0300 @@ -709,7 +709,7 @@ if (!g->gcemergency) luaD_shrinkstack(th); /* do not change stack in emergency cycle */ for (o = th->top.p; o < th->stack_last.p + EXTRA_STACK; o++) - setnilvalue(s2v(o)); /* clear dead stack slice */ + setnilvalue2s(o); /* clear dead stack slice */ /* 'remarkupvals' may have removed thread from 'twups' list */ if (!isintwups(th) && th->openupval != NULL) { th->twups = g->twups; /* link it back to the list */ @@ -1293,7 +1293,7 @@ correctgraylists(g); checkSizes(L, g); g->gcstate = GCSpropagate; /* skip restart */ - if (!g->gcemergency && luaD_checkminstack(L)) + if (g->tobefnz != NULL && !g->gcemergency && luaD_checkminstack(L)) callallpendingfinalizers(L); } @@ -1672,7 +1672,7 @@ GCTM(L); /* call one finalizer */ stepresult = CWUFIN; } - else { /* no more finalizers or emergency mode or no enough stack + else { /* no more finalizers or emergency mode or not enough stack to run finalizers */ g->gcstate = GCSpause; /* finish collection */ stepresult = step2pause; diff -Nru lua-5.5.0/src/llex.c lua-5.5.1/src/llex.c --- lua-5.5.0/src/llex.c 2025-12-15 07:44:39.000000000 -0300 +++ lua-5.5.1/src/llex.c 2026-07-15 17:17:08.762936491 -0300 @@ -188,7 +188,7 @@ so they cannot be collected */ ls->envn = luaS_newliteral(L, LUA_ENV); /* get env string */ ls->brkn = luaS_newliteral(L, "break"); /* get "break" string */ -#if defined(LUA_COMPAT_GLOBAL) +#if LUA_COMPAT_GLOBAL /* compatibility mode: "global" is not a reserved word */ ls->glbn = luaS_newliteral(L, "global"); /* get "global" string */ ls->glbn->extra = 0; /* mark it as not reserved */ diff -Nru lua-5.5.0/src/llimits.h lua-5.5.1/src/llimits.h --- lua-5.5.0/src/llimits.h 2025-12-15 07:44:39.000000000 -0300 +++ lua-5.5.1/src/llimits.h 2026-07-15 17:17:08.791936292 -0300 @@ -234,12 +234,12 @@ /* floor division (defined as 'floor(a/b)') */ #if !defined(luai_numidiv) -#define luai_numidiv(L,a,b) ((void)L, l_floor(luai_numdiv(L,a,b))) +#define luai_numidiv(L,a,b) l_floor(luai_numdiv(L,a,b)) #endif /* float division */ #if !defined(luai_numdiv) -#define luai_numdiv(L,a,b) ((a)/(b)) +#define luai_numdiv(L,a,b) ((void)L, (a)/(b)) #endif /* @@ -267,10 +267,10 @@ /* the others are quite standard operations */ #if !defined(luai_numadd) -#define luai_numadd(L,a,b) ((a)+(b)) -#define luai_numsub(L,a,b) ((a)-(b)) -#define luai_nummul(L,a,b) ((a)*(b)) -#define luai_numunm(L,a) (-(a)) +#define luai_numadd(L,a,b) ((void)L, (a)+(b)) +#define luai_numsub(L,a,b) ((void)L, (a)-(b)) +#define luai_nummul(L,a,b) ((void)L, (a)*(b)) +#define luai_numunm(L,a) ((void)L, -(a)) #define luai_numeq(a,b) ((a)==(b)) #define luai_numlt(a,b) ((a)<(b)) #define luai_numle(a,b) ((a)<=(b)) diff -Nru lua-5.5.0/src/loadlib.c lua-5.5.1/src/loadlib.c --- lua-5.5.0/src/loadlib.c 2025-12-15 07:44:40.000000000 -0300 +++ lua-5.5.1/src/loadlib.c 2026-07-15 17:17:08.894935589 -0300 @@ -541,7 +541,7 @@ const char *name = luaL_checkstring(L, 1); filename = findfile(L, name, "path", LUA_LSUBSEP); if (filename == NULL) return 1; /* module not found in this path */ - return checkload(L, (luaL_loadfile(L, filename) == LUA_OK), filename); + return checkload(L, (luaL_loadfilex(L, filename, "bt") == LUA_OK), filename); } diff -Nru lua-5.5.0/src/lobject.h lua-5.5.1/src/lobject.h --- lua-5.5.0/src/lobject.h 2025-12-15 07:44:40.000000000 -0300 +++ lua-5.5.1/src/lobject.h 2026-07-15 17:17:08.908935493 -0300 @@ -208,7 +208,8 @@ #define ttisstrictnil(o) checktag((o), LUA_VNIL) -#define setnilvalue(obj) settt_(obj, LUA_VNIL) +#define setnilvalue(obj) settt_(obj, LUA_VNIL) +#define setnilvalue2s(stk) setnilvalue(s2v(stk)) #define isabstkey(v) checktag((v), LUA_VABSTKEY) diff -Nru lua-5.5.0/src/lopcodes.c lua-5.5.1/src/lopcodes.c --- lua-5.5.0/src/lopcodes.c 2025-12-15 07:44:40.000000000 -0300 +++ lua-5.5.1/src/lopcodes.c 2026-07-15 17:17:08.915935444 -0300 @@ -104,35 +104,26 @@ ,opmode(0, 1, 0, 0, 1, iABC) /* OP_VARARG */ ,opmode(0, 0, 0, 0, 1, iABC) /* OP_GETVARG */ ,opmode(0, 0, 0, 0, 0, iABx) /* OP_ERRNNIL */ - ,opmode(0, 0, 1, 0, 1, iABC) /* OP_VARARGPREP */ + ,opmode(0, 0, 0, 0, 0, iABC) /* OP_VARARGPREP */ ,opmode(0, 0, 0, 0, 0, iAx) /* OP_EXTRAARG */ }; - -/* -** Check whether instruction sets top for next instruction, that is, -** it results in multiple values. -*/ -int luaP_isOT (Instruction i) { - OpCode op = GET_OPCODE(i); - switch (op) { - case OP_TAILCALL: return 1; - default: - return testOTMode(op) && GETARG_C(i) == 0; - } -} +#define testITMode(m) (luaP_opmodes[m] & (1 << 5)) /* -** Check whether instruction uses top from previous instruction, that is, -** it accepts multiple results. +** Check whether instruction uses top. That happens for OP_VARARGPREP +** and for instructions that use multiple values set by the previous +** instruction. */ int luaP_isIT (Instruction i) { OpCode op = GET_OPCODE(i); switch (op) { case OP_SETLIST: - return testITMode(GET_OPCODE(i)) && GETARG_vB(i) == 0; + return GETARG_vB(i) == 0; + case OP_VARARGPREP: + return 1; default: return testITMode(GET_OPCODE(i)) && GETARG_B(i) == 0; } diff -Nru lua-5.5.0/src/lopcodes.h lua-5.5.1/src/lopcodes.h --- lua-5.5.0/src/lopcodes.h 2025-12-15 07:44:40.000000000 -0300 +++ lua-5.5.1/src/lopcodes.h 2026-07-15 17:17:08.935935308 -0300 @@ -417,8 +417,8 @@ ** bits 0-2: op mode ** bit 3: instruction set register A ** bit 4: operator is a test (next instruction must be a jump) -** bit 5: instruction uses 'L->top' set by previous instruction (when B == 0) -** bit 6: instruction sets 'L->top' for next instruction (when C == 0) +** bit 5: used by 'luaP_isIT' +** bit 6: used by 'luaP_isOT' ** bit 7: instruction is an MM instruction (call a metamethod) */ @@ -427,12 +427,17 @@ #define getOpMode(m) (cast(enum OpMode, luaP_opmodes[m] & 7)) #define testAMode(m) (luaP_opmodes[m] & (1 << 3)) #define testTMode(m) (luaP_opmodes[m] & (1 << 4)) -#define testITMode(m) (luaP_opmodes[m] & (1 << 5)) -#define testOTMode(m) (luaP_opmodes[m] & (1 << 6)) #define testMMMode(m) (luaP_opmodes[m] & (1 << 7)) -LUAI_FUNC int luaP_isOT (Instruction i); +/* Check whether instruction sets top for next instruction, that is, +** it results in multiple values. Used only for tests. +*/ +#define luaP_isOT(i) \ + (GET_OPCODE(i) == OP_TAILCALL || \ + ((luaP_opmodes[GET_OPCODE(i)] & (1 << 6)) && GETARG_C(i) == 0)) + + LUAI_FUNC int luaP_isIT (Instruction i); diff -Nru lua-5.5.0/src/lparser.c lua-5.5.1/src/lparser.c --- lua-5.5.0/src/lparser.c 2025-12-15 07:44:40.000000000 -0300 +++ lua-5.5.1/src/lparser.c 2026-07-15 17:17:09.038934603 -0300 @@ -821,8 +821,7 @@ luaC_objbarrier(L, f, f->source); f->maxstacksize = 2; /* registers 0/1 are always valid */ fs->kcache = luaH_new(L); /* create table for function */ - sethvalue2s(L, L->top.p, fs->kcache); /* anchor it */ - luaD_inctop(L); + luaD_anchorobj(L, ls->h, obj2gco(fs->kcache)); /* anchor it */ enterblock(fs, bl, 0); } @@ -831,6 +830,7 @@ lua_State *L = ls->L; FuncState *fs = ls->fs; Proto *f = fs->f; + TValue temp; luaK_ret(fs, luaY_nvarstack(fs), 0); /* final return */ leaveblock(fs); lua_assert(fs->bl == NULL); @@ -843,8 +843,10 @@ luaM_shrinkvector(L, f->p, f->sizep, fs->np, Proto *); luaM_shrinkvector(L, f->locvars, f->sizelocvars, fs->ndebugvars, LocVar); luaM_shrinkvector(L, f->upvalues, f->sizeupvalues, fs->nups, Upvaldesc); + /* remove kcache table from scanner table ("weigh" its anchor) */ + sethvalue(L, &temp, fs->kcache); /* key to be set to nil */ + luaH_set(L, ls->h, &temp, &G(L)->nilvalue); ls->fs = fs->prev; - L->top.p--; /* pop kcache table */ luaC_checkGC(L); } @@ -1164,6 +1166,7 @@ } default: { luaX_syntaxerror(ls, "function arguments expected"); + return; /* to avoid warnings */ } } lua_assert(f->k == VNONRELOC); @@ -2111,7 +2114,7 @@ gotostat(ls, line); break; } -#if defined(LUA_COMPAT_GLOBAL) +#if LUA_COMPAT_GLOBAL case TK_NAME: { /* compatibility code to parse global keyword when "global" is not reserved */ @@ -2165,16 +2168,14 @@ } -LClosure *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff, +LClosure *luaY_parser (lua_State *L, ZIO *z, Table *anchor, Mbuffer *buff, Dyndata *dyd, const char *name, int firstchar) { LexState lexstate; FuncState funcstate; - LClosure *cl = luaF_newLclosure(L, 1); /* create main closure */ - setclLvalue2s(L, L->top.p, cl); /* anchor it (to avoid being collected) */ - luaD_inctop(L); - lexstate.h = luaH_new(L); /* create table for scanner */ - sethvalue2s(L, L->top.p, lexstate.h); /* anchor it */ - luaD_inctop(L); + LClosure *cl; + lexstate.h = anchor; /* table for scanner */ + cl = luaF_newLclosure(L, 1); /* create main closure */ + luaD_anchorobj(L, anchor, obj2gco(cl)); /* anchor it in scanner table */ funcstate.f = cl->p = luaF_newproto(L); luaC_objbarrier(L, cl, cl->p); funcstate.f->source = luaS_new(L, name); /* create and anchor TString */ @@ -2187,7 +2188,6 @@ lua_assert(!funcstate.prev && funcstate.nups == 1 && !lexstate.fs); /* all scopes should be correctly finished */ lua_assert(dyd->actvar.n == 0 && dyd->gt.n == 0 && dyd->label.n == 0); - L->top.p--; /* remove scanner's table */ - return cl; /* closure is on the stack, too */ + return cl; } diff -Nru lua-5.5.0/src/lparser.h lua-5.5.1/src/lparser.h --- lua-5.5.0/src/lparser.h 2025-12-15 07:44:40.000000000 -0300 +++ lua-5.5.1/src/lparser.h 2026-07-15 17:17:09.055934486 -0300 @@ -189,8 +189,9 @@ LUAI_FUNC lu_byte luaY_nvarstack (FuncState *fs); LUAI_FUNC void luaY_checklimit (FuncState *fs, int v, int l, const char *what); -LUAI_FUNC LClosure *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff, - Dyndata *dyd, const char *name, int firstchar); +LUAI_FUNC LClosure *luaY_parser (lua_State *L, ZIO *z, Table *anchor, + Mbuffer *buff, Dyndata *dyd, + const char *name, int firstchar); #endif diff -Nru lua-5.5.0/src/lstate.c lua-5.5.1/src/lstate.c --- lua-5.5.0/src/lstate.c 2025-12-15 07:44:40.000000000 -0300 +++ lua-5.5.1/src/lstate.c 2026-07-15 17:17:09.087934268 -0300 @@ -68,14 +68,19 @@ } -CallInfo *luaE_extendCI (lua_State *L) { +CallInfo *luaE_extendCI (lua_State *L, int err) { CallInfo *ci; - lua_assert(L->ci->next == NULL); - ci = luaM_new(L, CallInfo); - lua_assert(L->ci->next == NULL); - L->ci->next = ci; + ci = luaM_reallocvector(L, NULL, 0, 1, CallInfo); + if (l_unlikely(ci == NULL)) { /* allocation failed? */ + if (err) + luaM_error(L); /* raise the error */ + return NULL; /* else only report it */ + } + ci->next = L->ci->next; ci->previous = L->ci; - ci->next = NULL; + L->ci->next = ci; + if (ci->next) + ci->next->previous = ci; ci->u.l.trap = 0; L->nci++; return ci; @@ -146,7 +151,7 @@ static void resetCI (lua_State *L) { CallInfo *ci = L->ci = &L->base_ci; ci->func.p = L->stack.p; - setnilvalue(s2v(ci->func.p)); /* 'function' entry for basic 'ci' */ + setnilvalue2s(ci->func.p); /* 'function' entry for basic 'ci' */ ci->top.p = ci->func.p + 1 + LUA_MINSTACK; /* +1 for 'function' entry */ ci->u.c.k = NULL; ci->callstatus = CIST_C; @@ -161,7 +166,7 @@ L1->stack.p = luaM_newvector(L, BASIC_STACK_SIZE + EXTRA_STACK, StackValue); L1->tbclist.p = L1->stack.p; for (i = 0; i < BASIC_STACK_SIZE + EXTRA_STACK; i++) - setnilvalue(s2v(L1->stack.p + i)); /* erase new stack */ + setnilvalue2s(L1->stack.p + i); /* erase new stack */ L1->stack_last.p = L1->stack.p + BASIC_STACK_SIZE; /* initialize first ci */ resetCI(L1); diff -Nru lua-5.5.0/src/lstate.h lua-5.5.1/src/lstate.h --- lua-5.5.0/src/lstate.h 2025-12-15 07:44:40.000000000 -0300 +++ lua-5.5.1/src/lstate.h 2026-07-15 17:17:09.111934104 -0300 @@ -438,7 +438,7 @@ LUAI_FUNC void luaE_setdebt (global_State *g, l_mem debt); LUAI_FUNC void luaE_freethread (lua_State *L, lua_State *L1); LUAI_FUNC lu_mem luaE_threadsize (lua_State *L); -LUAI_FUNC CallInfo *luaE_extendCI (lua_State *L); +LUAI_FUNC CallInfo *luaE_extendCI (lua_State *L, int err); LUAI_FUNC void luaE_shrinkCI (lua_State *L); LUAI_FUNC void luaE_checkcstack (lua_State *L); LUAI_FUNC void luaE_incCstack (lua_State *L); diff -Nru lua-5.5.0/src/lstrlib.c lua-5.5.1/src/lstrlib.c --- lua-5.5.0/src/lstrlib.c 2025-12-15 07:44:40.000000000 -0300 +++ lua-5.5.1/src/lstrlib.c 2026-07-15 17:17:09.176933659 -0300 @@ -141,8 +141,8 @@ const char *s = luaL_checklstring(L, 1, &len); lua_Integer n = luaL_checkinteger(L, 2); const char *sep = luaL_optlstring(L, 3, "", &lsep); - if (n <= 0) - lua_pushliteral(L, ""); + if (n <= 0 || (len | lsep) == 0) + lua_pushliteral(L, ""); /* no repetitions or both strings empty */ else if (l_unlikely(len > MAX_SIZE - lsep || cast_st2S(len + lsep) > cast_st2S(MAX_SIZE) / n)) return luaL_error(L, "resulting string too large"); @@ -757,19 +757,25 @@ } +/* +** Prepare state for matches. These fields are not affected by each match. +*/ static void prepstate (MatchState *ms, lua_State *L, const char *s, size_t ls, const char *p, size_t lp) { ms->L = L; - ms->matchdepth = MAXCCALLS; ms->src_init = s; ms->src_end = s + ls; ms->p_end = p + lp; } +/* +** (Re)prepare state for a match, setting fields that change during +** each match. +*/ static void reprepstate (MatchState *ms) { + ms->matchdepth = MAXCCALLS; ms->level = 0; - lua_assert(ms->matchdepth == MAXCCALLS); } @@ -968,7 +974,7 @@ reprepstate(&ms); /* (re)prepare state for new match */ if ((e = match(&ms, src, p)) != NULL && e != lastmatch) { /* match? */ n++; - changed = add_value(&ms, &b, src, e, tr) | changed; + changed = add_value(&ms, &b, src, e, tr) || changed; src = lastmatch = e; } else if (src < ms.src_end) /* otherwise, skip one character */ @@ -1726,7 +1732,7 @@ luaL_argcheck(L, opt != Kstring && opt != Kzstr, 1, "variable-length format"); size += ntoalign; /* total space used by option */ - luaL_argcheck(L, totalsize <= LUA_MAXINTEGER - size, + luaL_argcheck(L, totalsize <= MAX_SIZE - size, 1, "format result too large"); totalsize += size; } diff -Nru lua-5.5.0/src/ltable.c lua-5.5.1/src/ltable.c --- lua-5.5.0/src/ltable.c 2025-12-15 07:44:40.000000000 -0300 +++ lua-5.5.1/src/ltable.c 2026-07-15 17:17:09.192933549 -0300 @@ -651,10 +651,9 @@ /* -** Exchange the hash part of 't1' and 't2'. (In 'flags', only the -** dummy bit must be exchanged: The 'isrealasize' is not related -** to the hash part, and the metamethod bits do not change during -** a resize, so the "real" table can keep their values.) +** Exchange the hash part of 't1' and 't2'. (In 'flags', only the dummy +** bit must be exchanged: The metamethod bits do not change during a +** resize, so the "real" table can keep their values.) */ static void exchangehashpart (Table *t1, Table *t2) { lu_byte lsizenode = t1->lsizenode; @@ -1156,14 +1155,15 @@ lua_assert(hres != HOK); if (hres == HNOTFOUND) { TValue aux; + const TValue *actk = key; /* actual key to insert */ if (l_unlikely(ttisnil(key))) luaG_runerror(L, "table index is nil"); else if (ttisfloat(key)) { lua_Number f = fltvalue(key); lua_Integer k; - if (luaV_flttointeger(f, &k, F2Ieq)) { - setivalue(&aux, k); /* key is equal to an integer */ - key = &aux; /* insert it as an integer */ + if (luaV_flttointeger(f, &k, F2Ieq)) { /* is key equal to an integer? */ + setivalue(&aux, k); + actk = &aux; /* use the integer as the key */ } else if (l_unlikely(luai_numisnan(f))) luaG_runerror(L, "table index is NaN"); @@ -1176,7 +1176,7 @@ L->top.p--; return; } - luaH_newkey(L, t, key, value); + luaH_newkey(L, t, actk, value); } else if (hres > 0) { /* regular Node? */ setobj2t(L, gval(gnode(t, hres - HFIRSTNODE)), value); diff -Nru lua-5.5.0/src/ltablib.c lua-5.5.1/src/ltablib.c --- lua-5.5.0/src/ltablib.c 2025-12-15 07:44:40.000000000 -0300 +++ lua-5.5.1/src/ltablib.c 2026-07-15 17:17:09.224933331 -0300 @@ -42,15 +42,17 @@ /* ** Check that 'arg' either is a table or can behave like one (that is, -** has a metatable with the required metamethods) +** has a metatable with the required metamethods). */ static void checktab (lua_State *L, int arg, int what) { - if (lua_type(L, arg) != LUA_TTABLE) { /* is it not a table? */ + int tp = lua_type(L, arg); + if (tp != LUA_TTABLE) { /* is it not a table? */ int n = 1; /* number of elements to pop */ if (lua_getmetatable(L, arg) && /* must have metatable */ (!(what & TAB_R) || checkfield(L, "__index", ++n)) && (!(what & TAB_W) || checkfield(L, "__newindex", ++n)) && - (!(what & TAB_L) || checkfield(L, "__len", ++n))) { + (!(what & TAB_L) || /* strings don't need '__len' to have a length */ + tp == LUA_TSTRING || checkfield(L, "__len", ++n))) { lua_pop(L, n); /* pop metatable and tested metamethods */ } else @@ -204,8 +206,9 @@ static int tunpack (lua_State *L) { lua_Unsigned n; + lua_Integer len = aux_getn(L, 1, TAB_R); lua_Integer i = luaL_optinteger(L, 2, 1); - lua_Integer e = luaL_opt(L, luaL_checkinteger, 3, luaL_len(L, 1)); + lua_Integer e = luaL_opt(L, luaL_checkinteger, 3, len); if (i > e) return 0; /* empty range */ n = l_castS2U(e) - l_castS2U(i); /* number of elements minus 1 */ if (l_unlikely(n >= (unsigned int)INT_MAX || diff -Nru lua-5.5.0/src/ltm.c lua-5.5.1/src/ltm.c --- lua-5.5.0/src/ltm.c 2025-12-15 07:44:40.000000000 -0300 +++ lua-5.5.1/src/ltm.c 2026-07-15 17:17:09.263933064 -0300 @@ -262,7 +262,7 @@ /* move fixed parameters to after the copied function */ for (i = 1; i <= nfixparams; i++) { setobjs2s(L, L->top.p++, ci->func.p + i); - setnilvalue(s2v(ci->func.p + i)); /* erase original parameter (for GC) */ + setnilvalue2s(ci->func.p + i); /* erase original parameter (for GC) */ } ci->func.p += totalargs + 1; /* 'func' now lives after hidden arguments */ ci->top.p += totalargs + 1; @@ -283,7 +283,7 @@ lua_assert(p->flag & PF_VAHID); buildhiddenargs(L, ci, p, totalargs, nfixparams, nextra); /* set vararg parameter to nil */ - setnilvalue(s2v(ci->func.p + nfixparams + 1)); + setnilvalue2s(ci->func.p + nfixparams + 1); lua_assert(L->top.p <= ci->top.p && ci->top.p <= L->stack_last.p); } } @@ -307,7 +307,7 @@ return; } } - setnilvalue(s2v(ra)); /* else produce nil */ + setnilvalue2s(ra); /* else produce nil */ } @@ -355,10 +355,10 @@ for (i = 0; i < touse; i++) { lu_byte tag = luaH_getint(h, i + 1, s2v(where + i)); if (tagisempty(tag)) - setnilvalue(s2v(where + i)); + setnilvalue2s(where + i); } } for (; i < wanted; i++) /* complete required results with nil */ - setnilvalue(s2v(where + i)); + setnilvalue2s(where + i); } diff -Nru lua-5.5.0/src/ltm.h lua-5.5.1/src/ltm.h --- lua-5.5.0/src/ltm.h 2025-12-15 07:44:40.000000000 -0300 +++ lua-5.5.1/src/ltm.h 2026-07-15 17:17:09.285932914 -0300 @@ -49,7 +49,7 @@ ** Mask with 1 in all fast-access methods. A 1 in any of these bits ** in the flag of a (meta)table means the metatable does not have the ** corresponding metamethod field. (Bit 6 of the flag indicates that -** the table is using the dummy node; bit 7 is used for 'isrealasize'.) +** the table is using the dummy node.) */ #define maskflags cast_byte(~(~0u << (TM_EQ + 1))) diff -Nru lua-5.5.0/src/lua.c lua-5.5.1/src/lua.c --- lua-5.5.0/src/lua.c 2025-12-15 07:44:40.000000000 -0300 +++ lua-5.5.1/src/lua.c 2026-07-15 17:17:09.292932865 -0300 @@ -30,6 +30,12 @@ #define LUA_INIT_VAR "LUA_INIT" #endif +/* Name of the environment variable with the name of the readline library */ +#if !defined(LUA_RLLIB_VAR) +#define LUA_RLLIB_VAR "LUA_READLINELIB" +#endif + + #define LUA_INITVARVERSION LUA_INIT_VAR LUA_VERSUFFIX @@ -201,12 +207,12 @@ static int dofile (lua_State *L, const char *name) { - return dochunk(L, luaL_loadfile(L, name)); + return dochunk(L, luaL_loadfilex(L, name, "bt")); } static int dostring (lua_State *L, const char *s, const char *name) { - return dochunk(L, luaL_loadbuffer(L, s, strlen(s), name)); + return dochunk(L, luaL_loadbufferx(L, s, strlen(s), name, "t")); } @@ -260,7 +266,7 @@ const char *fname = argv[0]; if (strcmp(fname, "-") == 0 && strcmp(argv[-1], "--") != 0) fname = NULL; /* stdin */ - status = luaL_loadfile(L, fname); + status = luaL_loadfilex(L, fname, "bt"); if (status == LUA_OK) { int n = pushargs(L); /* push arguments to script */ status = docall(L, n, LUA_MULTRET); @@ -374,12 +380,21 @@ } +static char *(*l_getenv)(const char *name); + +/* Function to ignore environment variables, used by option -E */ +static char *no_getenv (const char *name) { + UNUSED(name); + return NULL; +} + + static int handle_luainit (lua_State *L) { const char *name = "=" LUA_INITVARVERSION; - const char *init = getenv(name + 1); + const char *init = l_getenv(name + 1); if (init == NULL) { name = "=" LUA_INIT_VAR; - init = getenv(name + 1); /* try alternative name */ + init = l_getenv(name + 1); /* try alternative name */ } if (init == NULL) return LUA_OK; else if (init[0] == '@') @@ -498,18 +513,24 @@ #include static void lua_initreadline (lua_State *L) { - void *lib = dlopen(LUA_READLINELIB, RTLD_NOW | RTLD_LOCAL); - if (lib == NULL) - lua_warning(L, "library '" LUA_READLINELIB "' not found", 0); - else { + const char *rllib = l_getenv(LUA_RLLIB_VAR); /* name of readline library */ + void *lib; /* library handle */ + if (rllib == NULL) /* no environment variable? */ + rllib = LUA_READLINELIB; /* use default name */ + lib = dlopen(rllib, RTLD_NOW | RTLD_LOCAL); + if (lib != NULL) { const char **name = cast(const char**, dlsym(lib, "rl_readline_name")); if (name != NULL) *name = "lua"; l_readline = cast(l_readlineT, cast_func(dlsym(lib, "readline"))); l_addhist = cast(l_addhistT, cast_func(dlsym(lib, "add_history"))); - if (l_readline == NULL) - lua_warning(L, "unable to load 'readline'", 0); - } + if (l_readline != NULL) /* could load readline function? */ + return; /* everything ok */ + /* else emit a warning */ + } + lua_warning(L, "unable to load readline library '", 1); + lua_warning(L, rllib, 1); + lua_warning(L, "'", 0); } #else /* }{ */ @@ -588,11 +609,11 @@ static int addreturn (lua_State *L) { const char *line = lua_tostring(L, -1); /* original line */ const char *retline = lua_pushfstring(L, "return %s;", line); - int status = luaL_loadbuffer(L, retline, strlen(retline), "=stdin"); + int status = luaL_loadbufferx(L, retline, strlen(retline), "=stdin", "t"); if (status == LUA_OK) lua_remove(L, -2); /* remove modified line */ else - lua_pop(L, 2); /* pop result from 'luaL_loadbuffer' and modified line */ + lua_pop(L, 2); /* pop result from 'luaL_loadbufferx' and modified line */ return status; } @@ -619,7 +640,7 @@ const char *line = lua_tolstring(L, 1, &len); /* get first line */ checklocal(line); for (;;) { /* repeat until gets a complete statement */ - int status = luaL_loadbuffer(L, line, len, "=stdin"); /* try it */ + int status = luaL_loadbufferx(L, line, len, "=stdin", "t"); /* try it */ if (!incomplete(L, status) || !pushline(L, 0)) return status; /* should not or cannot try to add continuation line */ lua_remove(L, -2); /* remove error message (from incomplete line) */ @@ -693,7 +714,13 @@ /* }================================================================== */ #if !defined(luai_openlibs) -#define luai_openlibs(L) luaL_openselectedlibs(L, ~0, 0) +#if defined(LUA_NODEBUGLIB) +/* With this option, code must require the debug library before using it */ +#define luai_openlibs(L) luaL_openselectedlibs(L, ~LUA_DBLIBK, LUA_DBLIBK) +#else +/* The default is to open all standard libraries */ +#define luai_openlibs(L) luaL_openselectedlibs(L, ~0, 0) +#endif #endif @@ -715,17 +742,18 @@ if (args & has_v) /* option '-v'? */ print_version(); if (args & has_E) { /* option '-E'? */ + l_getenv = &no_getenv; /* program will ignore environment variables */ lua_pushboolean(L, 1); /* signal for libraries to ignore env. vars. */ lua_setfield(L, LUA_REGISTRYINDEX, "LUA_NOENV"); } + else + l_getenv = &getenv; luai_openlibs(L); /* open standard libraries */ createargtable(L, argv, argc, script); /* create table 'arg' */ lua_gc(L, LUA_GCRESTART); /* start GC... */ lua_gc(L, LUA_GCGEN); /* ...in generational mode */ - if (!(args & has_E)) { /* no option '-E'? */ - if (handle_luainit(L) != LUA_OK) /* run LUA_INIT */ - return 0; /* error running LUA_INIT */ - } + if (handle_luainit(L) != LUA_OK) /* run LUA_INIT */ + return 0; /* error running LUA_INIT */ if (!runargs(L, argv, optlim)) /* execute arguments -e, -l, and -W */ return 0; /* something failed */ if (script > 0) { /* execute main script (if there is one) */ diff -Nru lua-5.5.0/src/lua.h lua-5.5.1/src/lua.h --- lua-5.5.0/src/lua.h 2025-12-15 07:44:40.000000000 -0300 +++ lua-5.5.1/src/lua.h 2026-07-15 17:17:09.324932647 -0300 @@ -13,13 +13,13 @@ #include -#define LUA_COPYRIGHT LUA_RELEASE " Copyright (C) 1994-2025 Lua.org, PUC-Rio" +#define LUA_COPYRIGHT LUA_RELEASE " Copyright (C) 1994-2026 Lua.org, PUC-Rio" #define LUA_AUTHORS "R. Ierusalimschy, L. H. de Figueiredo, W. Celes" #define LUA_VERSION_MAJOR_N 5 #define LUA_VERSION_MINOR_N 5 -#define LUA_VERSION_RELEASE_N 0 +#define LUA_VERSION_RELEASE_N 1 #define LUA_VERSION_NUM (LUA_VERSION_MAJOR_N * 100 + LUA_VERSION_MINOR_N) #define LUA_VERSION_RELEASE_NUM (LUA_VERSION_NUM * 100 + LUA_VERSION_RELEASE_N) @@ -521,7 +521,7 @@ /****************************************************************************** -* Copyright (C) 1994-2025 Lua.org, PUC-Rio. +* Copyright (C) 1994-2026 Lua.org, PUC-Rio. * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the diff -Nru lua-5.5.0/src/luaconf.h lua-5.5.1/src/luaconf.h --- lua-5.5.0/src/luaconf.h 2025-12-15 07:44:40.000000000 -0300 +++ lua-5.5.1/src/luaconf.h 2026-07-15 17:17:09.360932401 -0300 @@ -70,14 +70,16 @@ #if defined(LUA_USE_LINUX) #define LUA_USE_POSIX #define LUA_USE_DLOPEN /* needs an extra library: -ldl */ +#if !defined(LUA_READLINELIB) #define LUA_READLINELIB "libreadline.so" #endif +#endif #if defined(LUA_USE_MACOSX) #define LUA_USE_POSIX #define LUA_USE_DLOPEN /* macOS does not need -ldl */ -#define LUA_READLINELIB "libedit.dylib" +#define LUA_USE_READLINE #endif @@ -224,17 +226,17 @@ #if !defined(LUA_PATH_DEFAULT) #define LUA_PATH_DEFAULT \ - LUA_LDIR"?.lua;" LUA_LDIR"?\\init.lua;" \ - LUA_CDIR"?.lua;" LUA_CDIR"?\\init.lua;" \ - LUA_SHRDIR"?.lua;" LUA_SHRDIR"?\\init.lua;" \ + LUA_LDIR "?.lua;" LUA_LDIR "?\\init.lua;" \ + LUA_CDIR "?.lua;" LUA_CDIR "?\\init.lua;" \ + LUA_SHRDIR "?.lua;" LUA_SHRDIR "?\\init.lua;" \ ".\\?.lua;" ".\\?\\init.lua" #endif #if !defined(LUA_CPATH_DEFAULT) #define LUA_CPATH_DEFAULT \ - LUA_CDIR"?.dll;" \ - LUA_CDIR"..\\lib\\lua\\" LUA_VDIR "\\?.dll;" \ - LUA_CDIR"loadall.dll;" ".\\?.dll" + LUA_CDIR "?.dll;" \ + LUA_CDIR "..\\lib\\lua\\" LUA_VDIR "\\?.dll;" \ + LUA_CDIR "loadall.dll;" ".\\?.dll" #endif #else /* }{ */ @@ -245,14 +247,14 @@ #if !defined(LUA_PATH_DEFAULT) #define LUA_PATH_DEFAULT \ - LUA_LDIR"?.lua;" LUA_LDIR"?/init.lua;" \ - LUA_CDIR"?.lua;" LUA_CDIR"?/init.lua;" \ + LUA_LDIR "?.lua;" LUA_LDIR "?/init.lua;" \ + LUA_CDIR "?.lua;" LUA_CDIR "?/init.lua;" \ "./?.lua;" "./?/init.lua" #endif #if !defined(LUA_CPATH_DEFAULT) #define LUA_CPATH_DEFAULT \ - LUA_CDIR"?.so;" LUA_CDIR"loadall.so;" "./?.so" + LUA_CDIR "?.so;" LUA_CDIR "loadall.so;" "./?.so" #endif #endif /* } */ @@ -339,7 +341,9 @@ /* @@ LUA_COMPAT_GLOBAL avoids 'global' being a reserved word */ -#define LUA_COMPAT_GLOBAL +#if !defined(LUA_COMPAT_GLOBAL) +#define LUA_COMPAT_GLOBAL 1 +#endif /* @@ -649,7 +653,7 @@ */ #if !defined(luai_likely) -#if defined(__GNUC__) && !defined(LUA_NOBUILTIN) +#if !defined(LUA_NOBUILTIN) && defined(__GNUC__) && (__GNUC__ >= 3) #define luai_likely(x) (__builtin_expect(((x) != 0), 1)) #define luai_unlikely(x) (__builtin_expect(((x) != 0), 0)) #else @@ -721,10 +725,17 @@ /* -@@ LUAI_MAXALIGN defines fields that, when used in a union, ensure -** maximum alignment for the other items in that union. +@@ LUAI_MAXALIGN defines fields that ensure proper alignment for +** memory areas offered by Lua (e.g., userdata memory). +** Add fields to it if you need alignment for non-ISO objects. */ +#if defined(LLONG_MAX) +/* use ISO C99 stuff */ +#define LUAI_MAXALIGN long double u; void *s; long long l +#else +/* use only C89 stuff */ #define LUAI_MAXALIGN lua_Number n; double u; void *s; lua_Integer i; long l +#endif /* }================================================================== */ diff -Nru lua-5.5.0/src/lundump.c lua-5.5.1/src/lundump.c --- lua-5.5.0/src/lundump.c 2025-12-15 07:44:40.000000000 -0300 +++ lua-5.5.1/src/lundump.c 2026-07-15 17:17:09.409932066 -0300 @@ -392,7 +392,8 @@ /* ** Load precompiled chunk. */ -LClosure *luaU_undump (lua_State *L, ZIO *Z, const char *name, int fixed) { +LClosure *luaU_undump (lua_State *L, ZIO *Z, Table *anchor, const char *name, + int fixed) { LoadState S; LClosure *cl; if (*name == '@' || *name == '=') @@ -405,20 +406,16 @@ S.fixed = cast_byte(fixed); S.offset = 1; /* fist byte was already read */ checkHeader(&S); - cl = luaF_newLclosure(L, loadByte(&S)); - setclLvalue2s(L, L->top.p, cl); - luaD_inctop(L); - S.h = luaH_new(L); /* create list of saved strings */ + S.h = anchor; S.nstr = 0; - sethvalue2s(L, L->top.p, S.h); /* anchor it */ - luaD_inctop(L); + cl = luaF_newLclosure(L, loadByte(&S)); + luaD_anchorobj(L, anchor, obj2gco(cl)); cl->p = luaF_newproto(L); luaC_objbarrier(L, cl, cl->p); loadFunction(&S, cl->p); if (cl->nupvalues != cl->p->sizeupvalues) error(&S, "corrupted chunk"); luai_verifycode(L, cl->p); - L->top.p--; /* pop table */ return cl; } diff -Nru lua-5.5.0/src/lundump.h lua-5.5.1/src/lundump.h --- lua-5.5.0/src/lundump.h 2025-12-15 07:44:40.000000000 -0300 +++ lua-5.5.1/src/lundump.h 2026-07-15 17:17:09.461931710 -0300 @@ -30,8 +30,8 @@ /* load one chunk; from lundump.c */ -LUAI_FUNC LClosure* luaU_undump (lua_State* L, ZIO* Z, const char* name, - int fixed); +LUAI_FUNC LClosure* luaU_undump (lua_State* L, ZIO* Z, Table *anchor, + const char* name, int fixed); /* dump one chunk; from ldump.c */ LUAI_FUNC int luaU_dump (lua_State* L, const Proto* f, lua_Writer w, diff -Nru lua-5.5.0/src/lutf8lib.c lua-5.5.1/src/lutf8lib.c --- lua-5.5.0/src/lutf8lib.c 2025-12-15 07:44:40.000000000 -0300 +++ lua-5.5.1/src/lutf8lib.c 2026-07-15 17:17:09.487931532 -0300 @@ -56,6 +56,8 @@ l_uint32 res = 0; /* final result */ if (c < 0x80) /* ASCII? */ res = c; + else if (c >= 0xfe) /* c >= 1111 1110b ? */ + return NULL; /* would need six or more continuation bytes */ else { int count = 0; /* to count number of continuation bytes */ for (; c & 0x40; c <<= 1) { /* while it needs continuation bytes... */ @@ -64,8 +66,9 @@ return NULL; /* invalid byte sequence */ res = (res << 6) | (cc & 0x3F); /* add lower 6 bits from cont. byte */ } + lua_assert(count <= 5); res |= ((l_uint32)(c & 0x7F) << (count * 5)); /* add first byte */ - if (count > 5 || res > MAXUTF || res < limits[count]) + if (res > MAXUTF || res < limits[count]) return NULL; /* invalid byte sequence */ s += count; /* skip continuation bytes read */ } @@ -146,7 +149,7 @@ static void pushutfchar (lua_State *L, int arg) { lua_Unsigned code = (lua_Unsigned)luaL_checkinteger(L, arg); luaL_argcheck(L, code <= MAXUTF, arg, "value out of range"); - lua_pushfstring(L, "%U", (long)code); + lua_pushfstring(L, "%U", cast(unsigned long, code)); } diff -Nru lua-5.5.0/src/lvm.c lua-5.5.1/src/lvm.c --- lua-5.5.0/src/lvm.c 2025-12-15 07:44:40.000000000 -0300 +++ lua-5.5.1/src/lvm.c 2026-07-15 17:17:09.493931490 -0300 @@ -268,9 +268,9 @@ /* ** Execute a step of a float numerical for loop, returning ** true iff the loop must continue. (The integer case is -** written online with opcode OP_FORLOOP, for performance.) +** written inline with opcode OP_FORLOOP, for performance.) */ -static int floatforloop (StkId ra) { +static int floatforloop (lua_State *L, StkId ra) { lua_Number step = fltvalue(s2v(ra + 1)); lua_Number limit = fltvalue(s2v(ra)); lua_Number idx = fltvalue(s2v(ra + 2)); /* control variable */ @@ -303,7 +303,7 @@ else { /* 't' is a table */ tm = fasttm(L, hvalue(t)->metatable, TM_INDEX); /* table's metamethod */ if (tm == NULL) { /* no metamethod? */ - setnilvalue(s2v(val)); /* result is nil */ + setnilvalue2s(val); /* result is nil */ return LUA_VNIL; } /* else will try the metamethod */ @@ -360,13 +360,19 @@ luaT_callTM(L, tm, t, key, val); return; } - t = tm; /* else repeat assignment over 'tm' */ - luaV_fastset(t, key, val, hres, luaH_pset); - if (hres == HOK) { - luaV_finishfastset(L, t, val); - return; /* done */ + t = tm; /* else must repeat assignment over 'tm' */ + /* do the equivalent to 'luaV_fastset', but saving 'h' */ + if (!ttistable(t)) + hres = HNOTATABLE; + else { + Table *h = hvalue(t); /* next call can change the value at 't' */ + hres = luaH_pset(h, key, val); + if (hres == HOK) { + luaC_barrierback(L, obj2gco(h), val); /* luaV_finishfastset */ + return; /* done */ + } } - /* else 'return luaV_finishset(L, t, key, val, slot)' (loop) */ + /* else 'return luaV_finishset(L, t, key, val, hres)' (loop) */ } luaG_runerror(L, "'__newindex' chain too long; possible loop"); } @@ -1841,7 +1847,7 @@ pc -= GETARG_Bx(i); /* jump back */ } } - else if (floatforloop(ra)) /* float loop */ + else if (floatforloop(L, ra)) /* float loop */ pc -= GETARG_Bx(i); /* jump back */ updatetrap(ci); /* allows a signal to break the loop */ vmbreak;