Small corrections in the manual

The call to 'luaL_newmetatable' in 'newbox' can leave an incomplete
metatable in the registry, if 'luaL_setfuncs' raises a memory error.

lapi.c

@@ -1089,6 +1089,7 @@ LUA_API int lua_load (lua_State *L, lua_Reader reader, void *data,
   ZIO z;
   int status;
   lua_lock(L);
+  luaC_checkGC(L);
   if (!chunkname) chunkname = "?";
   luaZ_init(L, &z, reader, data);
   status = luaD_protectedparser(L, &z, chunkname, mode);
@@ -1343,7 +1344,7 @@ void lua_warning (lua_State *L, const char *msg, int tocont) {
 LUA_API void *lua_newuserdatauv (lua_State *L, size_t size, int nuvalue) {
   Udata *u;
   lua_lock(L);
-  api_check(L, 0 <= nuvalue && nuvalue < USHRT_MAX, "invalid value");
+  api_check(L, 0 <= nuvalue && nuvalue < SHRT_MAX, "invalid value");
   u = luaS_newudata(L, size, nuvalue);
   setuvalue(L, s2v(L->top.p), u);
   api_incr_top(L);

lauxlib.c

@@ -80,6 +80,7 @@ static int pushglobalfuncname (lua_State *L, lua_Debug *ar) {
   int top = lua_gettop(L);
   lua_getinfo(L, "f", ar);  /* push function */
   lua_getfield(L, LUA_REGISTRYINDEX, LUA_LOADED_TABLE);
+  luaL_checkstack(L, 6, "not enough stack");  /* slots for 'findfield' */
   if (findfield(L, top + 1, 2)) {
     const char *name = lua_tostring(L, -1);
     if (strncmp(name, LUA_GNAME ".", 3) == 0) {  /* name start with '_G.'? */
@@ -249,11 +250,13 @@ LUALIB_API int luaL_fileresult (lua_State *L, int stat, const char *fname) {
     return 1;
   }
   else {
+    const char *msg;
     luaL_pushfail(L);
+    msg = (en != 0) ? strerror(en) : "(no extra info)";
     if (fname)
-      lua_pushfstring(L, "%s: %s", fname, strerror(en));
+      lua_pushfstring(L, "%s: %s", fname, msg);
     else
-      lua_pushstring(L, strerror(en));
+      lua_pushstring(L, msg);
     lua_pushinteger(L, en);
     return 3;
   }
@@ -498,12 +501,25 @@ static const luaL_Reg boxmt[] = {  /* box metamethods */
 };
 
 
+/*
+** 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);
 }
 
@@ -732,9 +748,12 @@ static const char *getF (lua_State *L, void *ud, size_t *size) {
 
 
 static int errfile (lua_State *L, const char *what, int fnameindex) {
-  const char *serr = strerror(errno);
+  int err = errno;
   const char *filename = lua_tostring(L, fnameindex) + 1;
-  lua_pushfstring(L, "cannot %s %s: %s", what, filename, serr);
+  if (err != 0)
+    lua_pushfstring(L, "cannot %s %s: %s", what, filename, strerror(err));
+  else
+    lua_pushfstring(L, "cannot %s %s", what, filename);
   lua_remove(L, fnameindex);
   return LUA_ERRFILE;
 }
@@ -787,6 +806,7 @@ LUALIB_API int luaL_loadfilex (lua_State *L, const char *filename,
   }
   else {
     lua_pushfstring(L, "@%s", filename);
+    errno = 0;
     lf.f = fopen(filename, "r");
     if (lf.f == NULL) return errfile(L, "open", fnameindex);
   }
@@ -796,6 +816,7 @@ LUALIB_API int luaL_loadfilex (lua_State *L, const char *filename,
   if (c == LUA_SIGNATURE[0]) {  /* binary file? */
     lf.n = 0;  /* remove possible newline */
     if (filename) {  /* "real" file? */
+      errno = 0;
       lf.f = freopen(filename, "rb", lf.f);  /* reopen in binary mode */
       if (lf.f == NULL) return errfile(L, "reopen", fnameindex);
       skipcomment(lf.f, &c);  /* re-read initial portion */
@@ -803,6 +824,7 @@ LUALIB_API int luaL_loadfilex (lua_State *L, const char *filename,
   }
   if (c != EOF)
     lf.buff[lf.n++] = c;  /* 'c' is the first character of the stream */
+  errno = 0;
   status = lua_load(L, getF, &lf, lua_tostring(L, -1), mode);
   readstatus = ferror(lf.f);
   if (filename) fclose(lf.f);  /* close file (even in case of errors) */
@@ -933,7 +955,7 @@ LUALIB_API const char *luaL_tolstring (lua_State *L, int idx, size_t *len) {
 LUALIB_API void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup) {
   luaL_checkstack(L, nup, "too many upvalues");
   for (; l->name != NULL; l++) {  /* fill the table with given functions */
-    if (l->func == NULL)  /* place holder? */
+    if (l->func == NULL)  /* placeholder? */
       lua_pushboolean(L, 0);
     else {
       int i;

lcode.c

@@ -35,6 +35,7 @@
 #define MAXREGS		255
 
 
+/* (note that expressions VJMP also have jumps.) */
 #define hasjumps(e)	((e)->t != (e)->f)
 
 
@@ -776,7 +777,8 @@ void luaK_dischargevars (FuncState *fs, expdesc *e) {
       break;
     }
     case VLOCAL: {  /* already in a register */
-      e->u.info = e->u.var.ridx;
+      int temp = e->u.var.ridx;
+      e->u.info = temp;  /* (can't do a direct assignment; values overlap) */
       e->k = VNONRELOC;  /* becomes a non-relocatable value */
       break;
     }
@@ -984,7 +986,7 @@ void luaK_exp2anyregup (FuncState *fs, expdesc *e) {
 ** or it is a constant.
 */
 void luaK_exp2val (FuncState *fs, expdesc *e) {
-  if (hasjumps(e))
+  if (e->k == VJMP || hasjumps(e))
     luaK_exp2anyreg(fs, e);
   else
     luaK_dischargevars(fs, e);
@@ -1283,8 +1285,9 @@ void luaK_indexed (FuncState *fs, expdesc *t, expdesc *k) {
   if (t->k == VUPVAL && !isKstr(fs, k))  /* upvalue indexed by non 'Kstr'? */
     luaK_exp2anyreg(fs, t);  /* put it in a register */
   if (t->k == VUPVAL) {
+    int temp = t->u.info;  /* upvalue index */
     lua_assert(isKstr(fs, k));
-    t->u.ind.t = t->u.info;  /* upvalue index */
+    t->u.ind.t = temp;  /* (can't do a direct assignment; values overlap) */
     t->u.ind.idx = k->u.info;  /* literal short string */
     t->k = VINDEXUP;
   }

ldebug.c

@@ -31,12 +31,15 @@
 
 
 
-#define noLuaClosure(f)		((f) == NULL || (f)->c.tt == LUA_VCCL)
+#define LuaClosure(f)		((f) != NULL && (f)->c.tt == LUA_VLCL)
 
 
 static const char *funcnamefromcall (lua_State *L, CallInfo *ci,
                                                    const char **name);
 
+static const char strlocal[] = "local";
+static const char strupval[] = "upvalue";
+
 
 static int currentpc (CallInfo *ci) {
   lua_assert(isLua(ci));
@@ -254,7 +257,7 @@ LUA_API const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n) {
 
 
 static void funcinfo (lua_Debug *ar, Closure *cl) {
-  if (noLuaClosure(cl)) {
+  if (!LuaClosure(cl)) {
     ar->source = "=[C]";
     ar->srclen = LL("=[C]");
     ar->linedefined = -1;
@@ -288,29 +291,31 @@ static int nextline (const Proto *p, int currentline, int pc) {
 
 
 static void collectvalidlines (lua_State *L, Closure *f) {
-  if (noLuaClosure(f)) {
+  if (!LuaClosure(f)) {
     setnilvalue(s2v(L->top.p));
     api_incr_top(L);
   }
   else {
-    int i;
-    TValue v;
     const Proto *p = f->l.p;
     int currentline = p->linedefined;
     Table *t = luaH_new(L);  /* new table to store active lines */
     sethvalue2s(L, L->top.p, t);  /* push it on stack */
     api_incr_top(L);
-    setbtvalue(&v);  /* boolean 'true' to be the value of all indices */
-    if (!p->is_vararg)  /* regular function? */
-      i = 0;  /* consider all instructions */
-    else {  /* vararg function */
-      lua_assert(GET_OPCODE(p->code[0]) == OP_VARARGPREP);
-      currentline = nextline(p, currentline, 0);
-      i = 1;  /* skip first instruction (OP_VARARGPREP) */
-    }
-    for (; i < p->sizelineinfo; i++) {  /* for each instruction */
-      currentline = nextline(p, currentline, i);  /* get its line */
-      luaH_setint(L, t, currentline, &v);  /* table[line] = true */
+    if (p->lineinfo != NULL) {  /* proto with debug information? */
+      int i;
+      TValue v;
+      setbtvalue(&v);  /* boolean 'true' to be the value of all indices */
+      if (!p->is_vararg)  /* regular function? */
+        i = 0;  /* consider all instructions */
+      else {  /* vararg function */
+        lua_assert(GET_OPCODE(p->code[0]) == OP_VARARGPREP);
+        currentline = nextline(p, currentline, 0);
+        i = 1;  /* skip first instruction (OP_VARARGPREP) */
+      }
+      for (; i < p->sizelineinfo; i++) {  /* for each instruction */
+        currentline = nextline(p, currentline, i);  /* get its line */
+        luaH_setint(L, t, currentline, &v);  /* table[line] = true */
+      }
     }
   }
 }
@@ -339,7 +344,7 @@ static int auxgetinfo (lua_State *L, const char *what, lua_Debug *ar,
       }
       case 'u': {
         ar->nups = (f == NULL) ? 0 : f->c.nupvalues;
-        if (noLuaClosure(f)) {
+        if (!LuaClosure(f)) {
           ar->isvararg = 1;
           ar->nparams = 0;
         }
@@ -495,7 +500,7 @@ static const char *basicgetobjname (const Proto *p, int *ppc, int reg,
   int pc = *ppc;
   *name = luaF_getlocalname(p, reg + 1, pc);
   if (*name)  /* is a local? */
-    return "local";
+    return strlocal;
   /* else try symbolic execution */
   *ppc = pc = findsetreg(p, pc, reg);
   if (pc != -1) {  /* could find instruction? */
@@ -510,7 +515,7 @@ static const char *basicgetobjname (const Proto *p, int *ppc, int reg,
       }
       case OP_GETUPVAL: {
         *name = upvalname(p, GETARG_B(i));
-        return "upvalue";
+        return strupval;
       }
       case OP_LOADK: return kname(p, GETARG_Bx(i), name);
       case OP_LOADKX: return kname(p, GETARG_Ax(p->code[pc + 1]), name);
@@ -545,15 +550,21 @@ static void rkname (const Proto *p, int pc, Instruction i, const char **name) {
 
 /*
 ** Check whether table being indexed by instruction 'i' is the
-** environment '_ENV'
+** environment '_ENV'. If the table is an upvalue, get its name;
+** otherwise, find some "name" for the table and check whether
+** that name is the name of a local variable (and not, for instance,
+** a string). Then check that, if there is a name, it is '_ENV'.
 */
 static const char *isEnv (const Proto *p, int pc, Instruction i, int isup) {
   int t = GETARG_B(i);  /* table index */
   const char *name;  /* name of indexed variable */
   if (isup)  /* is 't' an upvalue? */
     name = upvalname(p, t);
-  else  /* 't' is a register */
-    basicgetobjname(p, &pc, t, &name);
+  else {  /* 't' is a register */
+    const char *what = basicgetobjname(p, &pc, t, &name);
+    if (what != strlocal && what != strupval)
+      name = NULL;  /* cannot be the variable _ENV */
+  }
   return (name && strcmp(name, LUA_ENV) == 0) ? "global" : "field";
 }
 
@@ -699,7 +710,7 @@ static const char *getupvalname (CallInfo *ci, const TValue *o,
   for (i = 0; i < c->nupvalues; i++) {
     if (c->upvals[i]->v.p == o) {
       *name = upvalname(c->p, i);
-      return "upvalue";
+      return strupval;
     }
   }
   return NULL;

ldo.c

@@ -94,10 +94,6 @@ void luaD_seterrorobj (lua_State *L, int errcode, StkId oldtop) {
       setsvalue2s(L, oldtop, G(L)->memerrmsg); /* reuse preregistered msg. */
       break;
     }
-    case LUA_ERRERR: {
-      setsvalue2s(L, oldtop, luaS_newliteral(L, "error in error handling"));
-      break;
-    }
     case LUA_OK: {  /* special case only for closing upvalues */
       setnilvalue(s2v(oldtop));  /* no error message */
       break;
@@ -120,6 +116,7 @@ l_noret luaD_throw (lua_State *L, int errcode) {
   else {  /* thread has no error handler */
     global_State *g = G(L);
     errcode = luaE_resetthread(L, errcode);  /* close all upvalues */
+    L->status = errcode;
     if (g->mainthread->errorJmp) {  /* main thread has a handler? */
       setobjs2s(L, g->mainthread->top.p++, L->top.p - 1);  /* copy error obj. */
       luaD_throw(g->mainthread, errcode);  /* re-throw in main thread */
@@ -198,6 +195,35 @@ static void correctstack (lua_State *L) {
 /* some space for error handling */
 #define ERRORSTACKSIZE	(LUAI_MAXSTACK + 200)
 
+
+/* raise an error while running the message handler */
+l_noret luaD_errerr (lua_State *L) {
+  TString *msg = luaS_newliteral(L, "error in error handling");
+  setsvalue2s(L, L->top.p, msg);
+  L->top.p++;  /* assume EXTRA_STACK */
+  luaD_throw(L, LUA_ERRERR);
+}
+
+
+/*
+** 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) {
+  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);
+}
+
+
 /*
 ** Reallocate the stack to a new size, correcting all pointers into it.
 ** In ISO C, any pointer use after the pointer has been deallocated is
@@ -247,7 +273,7 @@ int luaD_growstack (lua_State *L, int n, int raiseerror) {
        a stack error; cannot grow further than that. */
     lua_assert(stacksize(L) == ERRORSTACKSIZE);
     if (raiseerror)
-      luaD_throw(L, LUA_ERRERR);  /* error inside message handler */
+      luaD_errerr(L);  /* error inside message handler */
     return 0;  /* if not 'raiseerror', just signal it */
   }
   else if (n < LUAI_MAXSTACK) {  /* avoids arithmetic overflows */
@@ -496,7 +522,7 @@ void luaD_poscall (lua_State *L, CallInfo *ci, int nres) {
 
 
 
-#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))
 
 
 l_sinline CallInfo *prepCallInfo (lua_State *L, StkId func, int nret,

ldo.h

@@ -60,6 +60,7 @@
 /* type of protected functions, to be ran by 'runprotected' */
 typedef void (*Pfunc) (lua_State *L, void *ud);
 
+LUAI_FUNC l_noret luaD_errerr (lua_State *L);
 LUAI_FUNC void luaD_seterrorobj (lua_State *L, int errcode, StkId oldtop);
 LUAI_FUNC int luaD_protectedparser (lua_State *L, ZIO *z, const char *name,
                                                   const char *mode);
@@ -79,6 +80,7 @@ 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 l_noret luaD_throw (lua_State *L, int errcode);
 LUAI_FUNC int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud);

lgc.c

@@ -553,8 +553,12 @@ static lu_mem traversetable (global_State *g, Table *h) {
       traverseweakvalue(g, h);
     else if (!weakvalue)  /* strong values? */
       traverseephemeron(g, h, 0);
-    else  /* all weak */
-      linkgclist(h, g->allweak);  /* nothing to traverse now */
+    else {  /* all weak */
+      if (g->gcstate == GCSpropagate)
+        linkgclist(h, g->grayagain);  /* must visit again its metatable */
+      else
+        linkgclist(h, g->allweak);  /* must clear collected entries */
+    }
   }
   else  /* not weak */
     traversestrongtable(g, h);
@@ -1238,7 +1242,7 @@ static void finishgencycle (lua_State *L, global_State *g) {
   correctgraylists(g);
   checkSizes(L, g);
   g->gcstate = GCSpropagate;  /* skip restart */
-  if (!g->gcemergency)
+  if (g->tobefnz != NULL && !g->gcemergency && luaD_checkminstack(L))
     callallpendingfinalizers(L);
 }
 
@@ -1628,11 +1632,12 @@ static lu_mem singlestep (lua_State *L) {
       break;
     }
     case GCScallfin: {  /* call remaining finalizers */
-      if (g->tobefnz && !g->gcemergency) {
+      if (g->tobefnz && !g->gcemergency && luaD_checkminstack(L)) {
         g->gcstopem = 0;  /* ok collections during finalizers */
         work = runafewfinalizers(L, GCFINMAX) * GCFINALIZECOST;
       }
-      else {  /* emergency mode or no more finalizers */
+      else {  /* no more finalizers or emergency mode or no enough stack
+                 to run finalizers */
         g->gcstate = GCSpause;  /* finish collection */
         work = 0;
       }
@@ -1713,7 +1718,7 @@ static void fullinc (lua_State *L, global_State *g) {
   /* finish any pending sweep phase to start a new cycle */
   luaC_runtilstate(L, bitmask(GCSpause));
   luaC_runtilstate(L, bitmask(GCSpropagate));  /* start new cycle */
-  g->gcstate = GCSenteratomic;  /* go straight to atomic phase ??? */
+  g->gcstate = GCSenteratomic;  /* go straight to atomic phase */
   luaC_runtilstate(L, bitmask(GCScallfin));  /* run up to finalizers */
   /* estimate must be correct after a full GC cycle */
   lua_assert(g->GCestimate == gettotalbytes(g));

liolib.c

@@ -245,8 +245,8 @@ static int f_gc (lua_State *L) {
 */
 static int io_fclose (lua_State *L) {
   LStream *p = tolstream(L);
-  int res = fclose(p->f);
-  return luaL_fileresult(L, (res == 0), NULL);
+  errno = 0;
+  return luaL_fileresult(L, (fclose(p->f) == 0), NULL);
 }
 
 
@@ -272,6 +272,7 @@ static int io_open (lua_State *L) {
   LStream *p = newfile(L);
   const char *md = mode;  /* to traverse/check mode */
   luaL_argcheck(L, l_checkmode(md), 2, "invalid mode");
+  errno = 0;
   p->f = fopen(filename, mode);
   return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;
 }
@@ -292,6 +293,7 @@ static int io_popen (lua_State *L) {
   const char *mode = luaL_optstring(L, 2, "r");
   LStream *p = newprefile(L);
   luaL_argcheck(L, l_checkmodep(mode), 2, "invalid mode");
+  errno = 0;
   p->f = l_popen(L, filename, mode);
   p->closef = &io_pclose;
   return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;
@@ -300,6 +302,7 @@ static int io_popen (lua_State *L) {
 
 static int io_tmpfile (lua_State *L) {
   LStream *p = newfile(L);
+  errno = 0;
   p->f = tmpfile();
   return (p->f == NULL) ? luaL_fileresult(L, 0, NULL) : 1;
 }
@@ -567,6 +570,7 @@ static int g_read (lua_State *L, FILE *f, int first) {
   int nargs = lua_gettop(L) - 1;
   int n, success;
   clearerr(f);
+  errno = 0;
   if (nargs == 0) {  /* no arguments? */
     success = read_line(L, f, 1);
     n = first + 1;  /* to return 1 result */
@@ -660,6 +664,7 @@ static int io_readline (lua_State *L) {
 static int g_write (lua_State *L, FILE *f, int arg) {
   int nargs = lua_gettop(L) - arg;
   int status = 1;
+  errno = 0;
   for (; nargs--; arg++) {
     if (lua_type(L, arg) == LUA_TNUMBER) {
       /* optimization: could be done exactly as for strings */
@@ -678,7 +683,8 @@ static int g_write (lua_State *L, FILE *f, int arg) {
   }
   if (l_likely(status))
     return 1;  /* file handle already on stack top */
-  else return luaL_fileresult(L, status, NULL);
+  else
+    return luaL_fileresult(L, status, NULL);
 }
 
 
@@ -703,6 +709,7 @@ static int f_seek (lua_State *L) {
   l_seeknum offset = (l_seeknum)p3;
   luaL_argcheck(L, (lua_Integer)offset == p3, 3,
                   "not an integer in proper range");
+  errno = 0;
   op = l_fseek(f, offset, mode[op]);
   if (l_unlikely(op))
     return luaL_fileresult(L, 0, NULL);  /* error */
@@ -719,19 +726,25 @@ static int f_setvbuf (lua_State *L) {
   FILE *f = tofile(L);
   int op = luaL_checkoption(L, 2, NULL, modenames);
   lua_Integer sz = luaL_optinteger(L, 3, LUAL_BUFFERSIZE);
-  int res = setvbuf(f, NULL, mode[op], (size_t)sz);
+  int res;
+  errno = 0;
+  res = setvbuf(f, NULL, mode[op], (size_t)sz);
   return luaL_fileresult(L, res == 0, NULL);
 }
 
 
 
 static int io_flush (lua_State *L) {
-  return luaL_fileresult(L, fflush(getiofile(L, IO_OUTPUT)) == 0, NULL);
+  FILE *f = getiofile(L, IO_OUTPUT);
+  errno = 0;
+  return luaL_fileresult(L, fflush(f) == 0, NULL);
 }
 
 
 static int f_flush (lua_State *L) {
-  return luaL_fileresult(L, fflush(tofile(L)) == 0, NULL);
+  FILE *f = tofile(L);
+  errno = 0;
+  return luaL_fileresult(L, fflush(f) == 0, NULL);
 }
 
 
@@ -773,7 +786,7 @@ static const luaL_Reg meth[] = {
 ** metamethods for file handles
 */
 static const luaL_Reg metameth[] = {
-  {"__index", NULL},  /* place holder */
+  {"__index", NULL},  /* placeholder */
   {"__gc", f_gc},
   {"__close", f_gc},
   {"__tostring", f_tostring},

lmathlib.c

@@ -352,7 +352,7 @@ static lua_Number I2d (Rand64 x) {
   SRand64 sx = (SRand64)(trim64(x) >> shift64_FIG);
   lua_Number res = (lua_Number)(sx) * scaleFIG;
   if (sx < 0)
-    res += 1.0;  /* correct the two's complement if negative */
+    res += l_mathop(1.0);  /* correct the two's complement if negative */
   lua_assert(0 <= res && res < 1);
   return res;
 }

loslib.c

@@ -155,6 +155,7 @@ static int os_execute (lua_State *L) {
 
 static int os_remove (lua_State *L) {
   const char *filename = luaL_checkstring(L, 1);
+  errno = 0;
   return luaL_fileresult(L, remove(filename) == 0, filename);
 }
 
@@ -162,6 +163,7 @@ static int os_remove (lua_State *L) {
 static int os_rename (lua_State *L) {
   const char *fromname = luaL_checkstring(L, 1);
   const char *toname = luaL_checkstring(L, 2);
+  errno = 0;
   return luaL_fileresult(L, rename(fromname, toname) == 0, NULL);
 }
 

lparser.c

@@ -198,7 +198,7 @@ static int new_localvar (LexState *ls, TString *name) {
   checklimit(fs, dyd->actvar.n + 1 - fs->firstlocal,
                  MAXVARS, "local variables");
   luaM_growvector(L, dyd->actvar.arr, dyd->actvar.n + 1,
-                  dyd->actvar.size, Vardesc, USHRT_MAX, "local variables");
+                  dyd->actvar.size, Vardesc, SHRT_MAX, "local variables");
   var = &dyd->actvar.arr[dyd->actvar.n++];
   var->vd.kind = VDKREG;  /* default */
   var->vd.name = name;
@@ -849,12 +849,11 @@ static void recfield (LexState *ls, ConsControl *cc) {
   FuncState *fs = ls->fs;
   int reg = ls->fs->freereg;
   expdesc tab, key, val;
-  if (ls->t.token == TK_NAME) {
-    checklimit(fs, cc->nh, MAX_INT, "items in a constructor");
+  if (ls->t.token == TK_NAME)
     codename(ls, &key);
-  }
   else  /* ls->t.token == '[' */
     yindex(ls, &key);
+  checklimit(fs, cc->nh, MAX_INT, "items in a constructor");
   cc->nh++;
   checknext(ls, '=');
   tab = *cc->t;
@@ -941,6 +940,8 @@ static void constructor (LexState *ls, expdesc *t) {
     if (ls->t.token == '}') break;
     closelistfield(fs, &cc);
     field(ls, &cc);
+    checklimit(fs, cc.tostore + cc.na + cc.nh, INT_MAX/2,
+               "items in a constructor");
   } while (testnext(ls, ',') || testnext(ls, ';'));
   check_match(ls, '}', '{', line);
   lastlistfield(fs, &cc);

lstate.c

@@ -102,14 +102,19 @@ LUA_API int lua_setcstacklimit (lua_State *L, unsigned int limit) {
 }
 
 
-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;
@@ -166,7 +171,7 @@ void luaE_checkcstack (lua_State *L) {
   if (getCcalls(L) == LUAI_MAXCCALLS)
     luaG_runerror(L, "C stack overflow");
   else if (getCcalls(L) >= (LUAI_MAXCCALLS / 10 * 11))
-    luaD_throw(L, LUA_ERRERR);  /* error while handling stack error */
+    luaD_errerr(L);  /* error while handling stack error */
 }
 
 
@@ -272,7 +277,9 @@ static void close_state (lua_State *L) {
     luaC_freeallobjects(L);  /* just collect its objects */
   else {  /* closing a fully built state */
     L->ci = &L->base_ci;  /* unwind CallInfo list */
+    L->errfunc = 0;   /* stack unwind can "throw away" the error function */
     luaD_closeprotected(L, 1, LUA_OK);  /* close all upvalues */
+    L->top.p = L->stack.p + 1;  /* empty the stack to run finalizers */
     luaC_freeallobjects(L);  /* collect all objects */
     luai_userstateclose(L);
   }
@@ -328,6 +335,7 @@ int luaE_resetthread (lua_State *L, int status) {
   if (status == LUA_YIELD)
     status = LUA_OK;
   L->status = LUA_OK;  /* so it can run __close metamethods */
+  L->errfunc = 0;   /* stack unwind can "throw away" the error function */
   status = luaD_closeprotected(L, 1, status);
   if (status != LUA_OK)  /* errors? */
     luaD_seterrorobj(L, status, L->stack.p + 1);

lstate.h

@@ -395,7 +395,7 @@ union GCUnion {
 
 LUAI_FUNC void luaE_setdebt (global_State *g, l_mem debt);
 LUAI_FUNC void luaE_freethread (lua_State *L, lua_State *L1);
-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);

lstrlib.c

@@ -757,7 +757,6 @@ static int nospecials (const char *p, size_t l) {
 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;
@@ -765,8 +764,8 @@ static void prepstate (MatchState *ms, lua_State *L,
 
 
 static void reprepstate (MatchState *ms) {
+  ms->matchdepth = MAXCCALLS;
   ms->level = 0;
-  lua_assert(ms->matchdepth == MAXCCALLS);
 }
 
 

ltests.c

@@ -1650,6 +1650,14 @@ static int runC (lua_State *L, lua_State *L1, const char *pc) {
       int nres;
       status = lua_resume(lua_tothread(L1, i), L, getnum, &nres);
     }
+    else if EQ("traceback") {
+      const char *msg = getstring;
+      int level = getnum;
+      luaL_traceback(L1, L1, msg, level);
+    }
+    else if EQ("threadstatus") {
+      lua_pushstring(L1, statcodes[lua_status(L1)]);
+    }
     else if EQ("return") {
       int n = getnum;
       if (L1 != L) {

lua.c

@@ -115,12 +115,13 @@ static void l_message (const char *pname, const char *msg) {
 
 /*
 ** Check whether 'status' is not OK and, if so, prints the error
-** message on the top of the stack. It assumes that the error object
-** is a string, as it was either generated by Lua or by 'msghandler'.
+** message on the top of the stack.
 */
 static int report (lua_State *L, int status) {
   if (status != LUA_OK) {
     const char *msg = lua_tostring(L, -1);
+    if (msg == NULL)
+      msg = "(error message not a string)";
     l_message(progname, msg);
     lua_pop(L, 1);  /* remove message */
   }
@@ -211,7 +212,7 @@ static int dostring (lua_State *L, const char *s, const char *name) {
 /*
 ** Receives 'globname[=modname]' and runs 'globname = require(modname)'.
 ** If there is no explicit modname and globname contains a '-', cut
-** the sufix after '-' (the "version") to make the global name.
+** the suffix after '-' (the "version") to make the global name.
 */
 static int dolibrary (lua_State *L, char *globname) {
   int status;
@@ -230,7 +231,7 @@ static int dolibrary (lua_State *L, char *globname) {
   status = docall(L, 1, 1);  /* call 'require(modname)' */
   if (status == LUA_OK) {
     if (suffix != NULL)  /* is there a suffix mark? */
-      *suffix = '\0';  /* remove sufix from global name */
+      *suffix = '\0';  /* remove suffix from global name */
     lua_setglobal(L, globname);  /* globname = require(modname) */
   }
   return report(L, status);
@@ -301,7 +302,8 @@ static int collectargs (char **argv, int *first) {
       case '-':  /* '--' */
         if (argv[i][2] != '\0')  /* extra characters after '--'? */
           return has_error;  /* invalid option */
-        *first = i + 1;
+        /* if there is a script name, it comes after '--' */
+        *first = (argv[i + 1] != NULL) ? i + 1 : 0;
         return args;
       case '\0':  /* '-' */
         return args;  /* script "name" is '-' */
@@ -489,10 +491,8 @@ static int incomplete (lua_State *L, int status) {
   if (status == LUA_ERRSYNTAX) {
     size_t lmsg;
     const char *msg = lua_tolstring(L, -1, &lmsg);
-    if (lmsg >= marklen && strcmp(msg + lmsg - marklen, EOFMARK) == 0) {
-      lua_pop(L, 1);
+    if (lmsg >= marklen && strcmp(msg + lmsg - marklen, EOFMARK) == 0)
       return 1;
-    }
   }
   return 0;  /* else... */
 }
@@ -507,9 +507,9 @@ static int pushline (lua_State *L, int firstline) {
   size_t l;
   const char *prmt = get_prompt(L, firstline);
   int readstatus = lua_readline(L, b, prmt);
-  if (readstatus == 0)
-    return 0;  /* no input (prompt will be popped by caller) */
   lua_pop(L, 1);  /* remove prompt */
+  if (readstatus == 0)
+    return 0;  /* no input */
   l = strlen(b);
   if (l > 0 && b[l-1] == '\n')  /* line ends with newline? */
     b[--l] = '\0';  /* remove it */
@@ -551,8 +551,9 @@ static int multiline (lua_State *L) {
     int status = luaL_loadbuffer(L, line, len, "=stdin");  /* try it */
     if (!incomplete(L, status) || !pushline(L, 0)) {
       lua_saveline(L, line);  /* keep history */
-      return status;  /* cannot or should not try to add continuation line */
+      return status;  /* should not or cannot try to add continuation line */
     }
+    lua_remove(L, -2);  /* remove error message (from incomplete line) */
     lua_pushliteral(L, "\n");  /* add newline... */
     lua_insert(L, -2);  /* ...between the two lines */
     lua_concat(L, 3);  /* join them */

lua.h

@@ -1,7 +1,7 @@
 /*
 ** $Id: lua.h $
 ** Lua - A Scripting Language
-** Lua.org, PUC-Rio, Brazil (www.lua.org)
+** Lua.org, PUC-Rio, Brazil (http://www.lua.org)
 ** See Copyright Notice at the end of this file
 */
 
@@ -13,21 +13,22 @@
 #include <stddef.h>
 
 
-#define LUA_COPYRIGHT	LUA_RELEASE "  Copyright (C) 1994-2023 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	4
-#define LUA_VERSION_RELEASE_N	6
-
-#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)
-
-
 #include "luaconf.h"
 
 
+#define LUA_VERSION_MAJOR	"5"
+#define LUA_VERSION_MINOR	"4"
+#define LUA_VERSION_RELEASE	"9"
+
+#define LUA_VERSION_NUM			504
+#define LUA_VERSION_RELEASE_NUM		(LUA_VERSION_NUM * 100 + 9)
+
+#define LUA_VERSION	"Lua " LUA_VERSION_MAJOR "." LUA_VERSION_MINOR
+#define LUA_RELEASE	LUA_VERSION "." LUA_VERSION_RELEASE
+#define LUA_COPYRIGHT	LUA_RELEASE "  Copyright (C) 1994-2026 Lua.org, PUC-Rio"
+#define LUA_AUTHORS	"R. Ierusalimschy, L. H. de Figueiredo, W. Celes"
+
+
 /* mark for precompiled code ('<esc>Lua') */
 #define LUA_SIGNATURE	"\x1bLua"
 
@@ -495,19 +496,8 @@ struct lua_Debug {
 /* }====================================================================== */
 
 
-#define LUAI_TOSTRAUX(x)	#x
-#define LUAI_TOSTR(x)		LUAI_TOSTRAUX(x)
-
-#define LUA_VERSION_MAJOR	LUAI_TOSTR(LUA_VERSION_MAJOR_N)
-#define LUA_VERSION_MINOR	LUAI_TOSTR(LUA_VERSION_MINOR_N)
-#define LUA_VERSION_RELEASE	LUAI_TOSTR(LUA_VERSION_RELEASE_N)
-
-#define LUA_VERSION	"Lua " LUA_VERSION_MAJOR "." LUA_VERSION_MINOR
-#define LUA_RELEASE	LUA_VERSION "." LUA_VERSION_RELEASE
-
-
 /******************************************************************************
-* Copyright (C) 1994-2023 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

luaconf.h

@@ -261,7 +261,7 @@
 /*
 ** LUA_IGMARK is a mark to ignore all after it when building the
 ** module name (e.g., used to build the luaopen_ function name).
-** Typically, the sufix after the mark is the module version,
+** Typically, the suffix after the mark is the module version,
 ** as in "mod-v1.2.so".
 */
 #define LUA_IGMARK		"-"

lundump.h

@@ -21,7 +21,7 @@
 /*
 ** Encode major-minor version in one byte, one nibble for each
 */
-#define LUAC_VERSION	(LUA_VERSION_MAJOR_N*16+LUA_VERSION_MINOR_N)
+#define LUAC_VERSION  (((LUA_VERSION_NUM / 100) * 16) + LUA_VERSION_NUM % 100)
 
 #define LUAC_FORMAT	0	/* this is the official format */
 

lutf8lib.c

@@ -65,6 +65,8 @@ static const char *utf8_decode (const char *s, utfint *val, int strict) {
   utfint 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... */
@@ -74,7 +76,7 @@ static const char *utf8_decode (const char *s, utfint *val, int strict) {
       res = (res << 6) | (cc & 0x3F);  /* add lower 6 bits from cont. byte */
     }
     res |= ((utfint)(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 */
   }

lvm.c

@@ -92,7 +92,7 @@ static int l_strton (const TValue *obj, TValue *result) {
   if (!cvt2num(obj))  /* is object not a string? */
     return 0;
   else {
-  TString *st = tsvalue(obj);
+    TString *st = tsvalue(obj);
     return (luaO_str2num(getstr(st), result) == tsslen(st) + 1);
   }
 }
@@ -339,7 +339,10 @@ void luaV_finishset (lua_State *L, const TValue *t, TValue *key,
       lua_assert(isempty(slot));  /* slot must be empty */
       tm = fasttm(L, h->metatable, TM_NEWINDEX);  /* get metamethod */
       if (tm == NULL) {  /* no metamethod? */
+        sethvalue2s(L, L->top.p, h);  /* anchor 't' */
+        L->top.p++;  /* assume EXTRA_STACK */
         luaH_finishset(L, h, key, slot, val);  /* set new value */
+        L->top.p--;
         invalidateTMcache(h);
         luaC_barrierback(L, obj2gco(h), val);
         return;
@@ -358,7 +361,12 @@ void luaV_finishset (lua_State *L, const TValue *t, TValue *key,
     }
     t = tm;  /* else repeat assignment over 'tm' */
     if (luaV_fastget(L, t, key, slot, luaH_get)) {
-      luaV_finishfastset(L, t, slot, val);
+      /* execute 'luaV_finishfastset', but preserving the original 't'
+         for the barrier. 't' and 'slot' can point to the same value,
+         and so the assignment can change 't' value */
+      GCObject *h = gcvalue(t);
+      setobj2t(L, cast(TValue *,slot), val);
+      luaC_barrierback(L, h, val);
       return;  /* done */
     }
     /* else 'return luaV_finishset(L, t, key, val, slot)' (loop) */

manual/2html

@@ -30,7 +30,7 @@ by Roberto Ierusalimschy, Luiz Henrique de Figueiredo, Waldemar Celes
 <p>
 <small>
 <a href="http://www.lua.org/copyright.html">Copyright</a>
-&copy; 2023 Lua.org, PUC-Rio.  All rights reserved.
+&copy; 2026 Lua.org, PUC-Rio.  All rights reserved.
 </small>
 <hr>
 
@@ -58,7 +58,7 @@ end
 
 local function compose (f,g)
   assert(f and g)
-  return function (s) return g(f(s)) end
+  return function (...) return g(f(...)) end
 end
 
 local function concat (f, g)
@@ -395,9 +395,10 @@ APIEntry = function (e)
   local apiicmd, ne = string.match(e, "^(.-</span>)(.*)")
 --io.stderr:write(e)
   if not apiicmd then
-    return antipara(Tag.hr() .. Tag.h3(a)) .. Tag.pre(h) .. e
+    return antipara(Tag.hr() .. Tag.h3(a)) .. Tag.pre(h, {class="api"}) .. e
   else
-    return antipara(Tag.hr() .. Tag.h3(a)) .. apiicmd .. Tag.pre(h) .. ne
+    return antipara(Tag.hr() .. Tag.h3(a)) .. apiicmd ..
+                    Tag.pre(h, {class="api"}) .. ne
   end
 end,
 

manual/manual.of

@@ -107,7 +107,7 @@ for small machines and embedded systems.
 
 Unless stated otherwise,
 any overflow when manipulating integer values @def{wrap around},
-according to the usual rules of two-complement arithmetic.
+according to the usual rules of two's complement arithmetic.
 (In other words,
 the actual result is the unique representable integer
 that is equal modulo @M{2@sp{n}} to the mathematical result,
@@ -289,7 +289,7 @@ Whenever there is an error,
 an @def{error object}
 is propagated with information about the error.
 Lua itself only generates errors whose error object is a string,
-but programs may generate errors with
+but programs can generate errors with
 any value as the error object.
 It is up to the Lua program or its host to handle such error objects.
 For historical reasons,
@@ -298,7 +298,7 @@ even though it does not have to be a string.
 
 
 When you use @Lid{xpcall} (or @Lid{lua_pcall}, in C)
-you may give a @def{message handler}
+you can give a @def{message handler}
 to be called in case of errors.
 This function is called with the original error object
 and returns a new error object.
@@ -343,7 +343,7 @@ which is then called a @def{metamethod}.
 In the previous example, the key is the string @St{__add}
 and the metamethod is the function that performs the addition.
 Unless stated otherwise,
-a metamethod may in fact be any @x{callable value},
+a metamethod can in fact be any @x{callable value},
 which is either a function or a value with a @idx{__call} metamethod.
 
 You can query the metatable of any value
@@ -609,7 +609,7 @@ as soon as the collector can be sure the object
 will not be accessed again in the normal execution of the program.
 (@Q{Normal execution} here excludes finalizers,
 which can resurrect dead objects @see{finalizers},
-and excludes also operations using the debug library.)
+and it excludes also operations using the debug library.)
 Note that the time when the collector can be sure that an object
 is dead may not coincide with the programmer's expectations.
 The only guarantees are that Lua will not collect an object
@@ -1417,7 +1417,7 @@ labels in Lua are considered statements too:
 
 A label is visible in the entire block where it is defined,
 except inside nested functions.
-A goto may jump to any visible label as long as it does not
+A goto can jump to any visible label as long as it does not
 enter into the scope of a local variable.
 A label should not be declared
 where a label with the same name is visible,
@@ -1950,12 +1950,12 @@ Note that keys that are not positive integers
 do not interfere with borders.
 
 A table with exactly one border is called a @def{sequence}.
-For instance, the table @T{{10, 20, 30, 40, 50}} is a sequence,
+For instance, the table @T{{10,20,30,40,50}} is a sequence,
 as it has only one border (5).
-The table @T{{10, 20, 30, nil, 50}} has two borders (3 and 5),
+The table @T{{10,20,30,nil,50}} has two borders (3 and 5),
 and therefore it is not a sequence.
 (The @nil at index 4 is called a @emphx{hole}.)
-The table @T{{nil, 20, 30, nil, nil, 60, nil}}
+The table @T{{nil,20,30,nil,nil,60,nil}}
 has three borders (0, 3, and 6),
 so it is not a sequence, too.
 The table @T{{}} is a sequence with border 0.
@@ -2318,7 +2318,7 @@ we recommend assigning the vararg expression
 to a single variable and using that variable
 in its place.
 
-Here are some examples of uses of mutlres expressions.
+Here are some examples of uses of multires expressions.
 In all cases, when the construction needs
 @Q{the n-th result} and there is no such result,
 it uses a @nil.
@@ -3471,9 +3471,9 @@ because a pseudo-index is not an actual stack position.
 The type of integers in Lua.
 
 By default this type is @id{long long},
-(usually a 64-bit two-complement integer),
+(usually a 64-bit two's complement integer),
 but that can be changed to @id{long} or @id{int}
-(usually a 32-bit two-complement integer).
+(usually a 32-bit two's complement integer).
 (See @id{LUA_INT_TYPE} in @id{luaconf.h}.)
 
 Lua also defines the constants
@@ -3689,7 +3689,7 @@ passes to the allocator in every call.
 @apii{0,1,m}
 
 Creates a new empty table and pushes it onto the stack.
-It is equivalent to @T{lua_createtable(L, 0, 0)}.
+It is equivalent to @T{lua_createtable(L,0,0)}.
 
 }
 
@@ -4416,7 +4416,7 @@ otherwise, returns @id{NULL}.
 }
 
 @APIEntry{void lua_toclose (lua_State *L, int index);|
-@apii{0,0,m}
+@apii{0,0,v}
 
 Marks the given index in the stack as a
 to-be-closed slot @see{to-be-closed}.
@@ -4433,6 +4433,9 @@ A slot marked as to-be-closed should not be removed from the stack
 by any other function in the API except @Lid{lua_settop} or @Lid{lua_pop},
 unless previously deactivated by @Lid{lua_closeslot}.
 
+This function raises an error if the value at the given slot
+neither has a @idx{__close} metamethod nor is a false value.
+
 This function should not be called for an index
 that is equal to or below an active to-be-closed slot.
 
@@ -4488,7 +4491,7 @@ but can contain other zeros in its body.
 
 This function can raise memory errors only
 when converting a number to a string
-(as then it has to create a new string).
+(as then it may create a new string).
 
 }
 
@@ -8773,13 +8776,13 @@ The returned table can contain all the fields returned by @Lid{lua_getinfo},
 with the string @id{what} describing which fields to fill in.
 The default for @id{what} is to get all information available,
 except the table of valid lines.
-If present,
-the option @Char{f}
+The option @Char{f}
 adds a field named @id{func} with the function itself.
-If present,
-the option @Char{L}
-adds a field named @id{activelines} with the table of
-valid lines.
+The option @Char{L} adds a field named @id{activelines}
+with the table of valid lines,
+provided the function is a Lua function.
+If the function has no debug information,
+the table is empty.
 
 For instance, the expression @T{debug.getinfo(1,"n").name} returns
 a name for the current function,

testes/all.lua

@@ -287,7 +287,7 @@ print("final OK !!!")
 
 --[[
 *****************************************************************************
-* Copyright (C) 1994-2016 Lua.org, PUC-Rio.
+* Copyright (C) 1994-2025 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

testes/api.lua

@@ -399,6 +399,10 @@ do
   -- trivial error
   assert(T.checkpanic("pushstring hi; error") == "hi")
 
+ -- thread status inside panic (bug in 5.4.4)
+  assert(T.checkpanic("pushstring hi; error", "threadstatus; return 2") ==
+         "ERRRUN")
+
   -- using the stack inside panic
   assert(T.checkpanic("pushstring hi; error;",
     [[checkstack 5 XX

testes/closure.lua

@@ -3,6 +3,14 @@
 
 print "testing closures"
 
+do  -- bug in 5.4.7
+  _ENV[true] = 10
+  local function aux () return _ENV[1 < 2] end
+  assert(aux() == 10)
+  _ENV[true] = nil
+end
+
+
 local A,B = 0,{g=10}
 local function f(x)
   local a = {}

testes/coroutine.lua

@@ -493,6 +493,25 @@ assert(not pcall(a, a))
 a = nil
 
 
+do
+  -- bug in 5.4: thread can use message handler higher in the stack
+  -- than the variable being closed
+  local c = coroutine.create(function()
+    local clo <close> = setmetatable({}, {__close=function()
+      local x = 134   -- will overwrite message handler
+      error(x)
+    end})
+    -- yields coroutine but leaves a new message handler for it,
+    -- that would be used when closing the coroutine (except that it
+    -- will be overwritten)
+    xpcall(coroutine.yield, function() return "XXX" end)
+  end)
+
+  assert(coroutine.resume(c))   -- start coroutine
+  local st, msg = coroutine.close(c)
+  assert(not st and msg == 134)
+end
+
 -- access to locals of erroneous coroutines
 local x = coroutine.create (function ()
             local a = 10

testes/db.lua

@@ -49,6 +49,15 @@ do
 end
 
 
+--  bug in 5.4.4-5.4.6: activelines in vararg functions
+--  without debug information
+do
+  local func = load(string.dump(load("print(10)"), true))
+  local actl = debug.getinfo(func, "L").activelines
+  assert(#actl == 0)   -- no line info
+end
+
+
 -- test file and string names truncation
 local a = "function f () end"
 local function dostring (s, x) return load(s, x)() end

testes/errors.lua

@@ -91,7 +91,7 @@ end
 
 if not T then
   (Message or print)
-    ('\n >>> testC not active: skipping memory message test <<<\n')
+    ('\n >>> testC not active: skipping tests for messages in C <<<\n')
 else
   print "testing memory error message"
   local a = {}
@@ -104,6 +104,19 @@ else
   end)
   T.totalmem(0)
   assert(not st and msg == "not enough" .. " memory")
+
+  -- stack space for luaL_traceback (bug in 5.4.6)
+  local res = T.testC[[
+    # push 16 elements on the stack
+    pushnum 1; pushnum 1; pushnum 1; pushnum 1; pushnum 1;
+    pushnum 1; pushnum 1; pushnum 1; pushnum 1; pushnum 1;
+    pushnum 1; pushnum 1; pushnum 1; pushnum 1; pushnum 1;
+    pushnum 1;
+    # traceback should work with 4 remaining slots
+    traceback xuxu 1;
+    return 1
+  ]]
+  assert(string.find(res, "xuxu.-main chunk"))
 end
 
 
@@ -124,6 +137,10 @@ checkmessage("aaa=(1)..{}", "a table value")
 -- bug in 5.4.6
 checkmessage("a = {_ENV = {}}; print(a._ENV.x + 1)", "field 'x'")
 
+-- a similar bug in 5.4.7, since 5.4.0
+checkmessage("print(('_ENV').x + 1)", "field 'x'")
+
+
 _G.aaa, _G.bbbb = nil
 
 -- calls

testes/events.lua

@@ -370,6 +370,29 @@ x = 0 .."a".."b"..c..d.."e".."f".."g"
 assert(x.val == "0abcdefg")
 
 
+do
+  -- bug since 5.4.1
+  local mt = setmetatable({__newindex={}}, {__mode='v'})
+  local t = setmetatable({}, mt)
+
+  if T then T.allocfailnext() end
+
+  -- seg. fault
+  for i=1, 10 do t[i] = 1 end
+end
+
+
+do   -- bug in 5.4
+  local parent = {}
+  parent.__newindex = parent
+  collectgarbage()
+  local child = setmetatable({}, parent)
+  child.__newindex = {x = "hello"}
+  collectgarbage("step")
+  assert(parent.__newindex.x == "hello")
+end
+
+
 -- concat metamethod x numbers (bug in 5.1.1)
 c = {}
 local x

testes/gc.lua

@@ -301,6 +301,16 @@ collectgarbage()
 assert(next(a) == string.rep('$', 11))
 
 
+if T then   -- bug since 5.3: all-weak tables are not being revisited
+  T.gcstate("propagate")
+  local t = setmetatable({}, {__mode = "kv"})
+  T.gcstate("atomic")   -- 't' was visited
+  setmetatable(t, {__mode = "kv"})
+  T.gcstate("pause")  -- its new metatable is not being visited
+  assert(getmetatable(t).__mode == "kv")
+end
+
+
 -- 'bug' in 5.1
 a = {}
 local t = {x = 10}

testes/main.lua

@@ -90,7 +90,7 @@ prepfile[[
 1, a
 )
 ]]
-RUN('lua - < %s > %s', prog, out)
+RUN('lua - -- < %s > %s', prog, out)
 checkout("1\tnil\n")
 
 RUN('echo "print(10)\nprint(2)\n" | lua > %s', out)
@@ -133,7 +133,7 @@ checkout("-h\n")
 prepfile("print(package.path)")
 
 -- test LUA_PATH
-RUN('env LUA_INIT= LUA_PATH=x lua %s > %s', prog, out)
+RUN('env LUA_INIT= LUA_PATH=x lua --  %s > %s', prog, out)
 checkout("x\n")
 
 -- test LUA_PATH_version
@@ -346,9 +346,14 @@ RUN([[lua -e"_PROMPT='' _PROMPT2=''" -i < %s > %s]], prog, out)
 checkprogout("6\n10\n10\n\n")
 
 prepfile("a = [[b\nc\nd\ne]]\n=a")
-RUN([[lua -e"_PROMPT='' _PROMPT2=''" -i < %s > %s]], prog, out)
+RUN([[lua -e"_PROMPT='' _PROMPT2=''" -i --  < %s > %s]], prog, out)
 checkprogout("b\nc\nd\ne\n\n")
 
+-- input interrupted in continuation line
+prepfile("a.\n")
+RUN([[lua -i < %s > /dev/null 2> %s]], prog, out)
+checkprogout("near <eof>\n")
+
 local prompt = "alo"
 prepfile[[ --
 a = 2
@@ -473,12 +478,14 @@ assert(not os.remove(out))
 -- invalid options
 NoRun("unrecognized option '-h'", "lua -h")
 NoRun("unrecognized option '---'", "lua ---")
-NoRun("unrecognized option '-Ex'", "lua -Ex")
+NoRun("unrecognized option '-Ex'", "lua -Ex --")
 NoRun("unrecognized option '-vv'", "lua -vv")
 NoRun("unrecognized option '-iv'", "lua -iv")
 NoRun("'-e' needs argument", "lua -e")
 NoRun("syntax error", "lua -e a")
 NoRun("'-l' needs argument", "lua -l")
+NoRun("-i", "lua -- -i")   -- handles -i as a script name
+
 
 
 if T then   -- test library?

testes/pm.lua

@@ -56,7 +56,8 @@ assert(f("  \n\r*&\n\r   xuxu  \n\n", "%g%g%g+") == "xuxu")
 
 -- Adapt a pattern to UTF-8
 local function PU (p)
-  -- break '?' into each individual byte of a character
+  -- reapply '?' into each individual byte of a character.
+  -- (For instance, "á?" becomes "\195?\161?".)
   p = string.gsub(p, "(" .. utf8.charpattern .. ")%?", function (c)
     return string.gsub(c, ".", "%0?")
   end)