Update Lua 5.4 to 5.4.0-rc4 and bump version to 535.0.4+540rc4

Author: khvzak

Cargo.toml

@@ -1,14 +1,14 @@
 [package]
 name = "lua-src"
-version = "535.0.3+540rc3"
+version = "535.0.4+540rc4"
 authors = ["Aleksandr Orlenko <zxteam@protonmail.com>"]
 edition = "2018"
 repository = "https://github.com/khvzak/lua-src-rs"
 keywords = ["lua", "lua51", "lua52", "lua53", "lua54"]
 readme = "README.md"
 license = "MIT"
 description = """
-Sources of Lua 5.1/5.2/5.3/5.4(rc3) and logic to build them.
+Sources of Lua 5.1/5.2/5.3/5.4(rc4) and logic to build them.
 """
 
 [workspace]

README.md

@@ -4,7 +4,7 @@
 [Build Status]: https://github.com/khvzak/lua-src-rs/workflows/CI/badge.svg
 [github-actions]: https://github.com/khvzak/lua-src-rs/actions
 
-This crate contains the sources of Lua 5.1/5.2/5.3/5.4(rc3) and logic to build them.
+This crate contains the sources of Lua 5.1/5.2/5.3/5.4(rc4) and logic to build them.
 Intended to be consumed by the [mlua](https://crates.io/crates/mlua) crate.
 
 # License

lua-5.4.0/lauxlib.c

@@ -284,7 +284,7 @@ LUALIB_API int luaL_fileresult (lua_State *L, int stat, const char *fname) {
 
 LUALIB_API int luaL_execresult (lua_State *L, int stat) {
   const char *what = "exit";  /* type of termination */
-  if (stat == -1)  /* error? */
+  if (stat != 0 && errno != 0)  /* error with an 'errno'? */
     return luaL_fileresult(L, 0, NULL);
   else {
     l_inspectstat(stat, what);  /* interpret result */
@@ -476,7 +476,7 @@ static void *resizebox (lua_State *L, int idx, size_t newsize) {
   UBox *box = (UBox *)lua_touserdata(L, idx);
   void *temp = allocf(ud, box->box, box->bsize, newsize);
   if (temp == NULL && newsize > 0)  /* allocation error? */
-    luaL_error(L, "not enough memory for buffer allocation");
+    luaL_error(L, "not enough memory");
   box->box = temp;
   box->bsize = newsize;
   return temp;

lua-5.4.0/ldebug.c

@@ -107,13 +107,15 @@ static int getcurrentline (CallInfo *ci) {
 
 
 /*
-** This function can be called asynchronously (e.g. during a signal),
-** under "reasonable" assumptions. A new 'ci' is completely linked
-** in the list before it becomes part of the "active" list, and
-** we assume that pointers are atomic (see comment in next function).
-** (If we traverse one more item, there is no problem. If we traverse
-** one less item, the worst that can happen is that the signal will
-** not interrupt the script.)
+** Set 'trap' for all active Lua frames.
+** This function can be called during a signal, under "reasonable"
+** assumptions. A new 'ci' is completely linked in the list before it
+** becomes part of the "active" list, and we assume that pointers are
+** atomic; see comment in next function.
+** (A compiler doing interprocedural optimizations could, theoretically,
+** reorder memory writes in such a way that the list could be
+** temporarily broken while inserting a new element. We simply assume it
+** has no good reasons to do that.)
 */
 static void settraps (CallInfo *ci) {
   for (; ci != NULL; ci = ci->previous)
@@ -123,8 +125,8 @@ static void settraps (CallInfo *ci) {
 
 
 /*
-** This function can be called asynchronously (e.g. during a signal),
-** under "reasonable" assumptions.
+** This function can be called during a signal, under "reasonable"
+** assumptions.
 ** Fields 'oldpc', 'basehookcount', and 'hookcount' (set by
 ** 'resethookcount') are for debug only, and it is no problem if they
 ** get arbitrary values (causes at most one wrong hook call). 'hookmask'

lua-5.4.0/ldo.c

@@ -422,7 +422,7 @@ void luaD_poscall (lua_State *L, CallInfo *ci, int nres) {
 
 
 
-#define next_ci(L)  (L->ci = (L->ci->next ? L->ci->next : luaE_extendCI(L)))
+#define next_ci(L)  (L->ci->next ? L->ci->next : luaE_extendCI(L))
 
 
 /*
@@ -466,13 +466,13 @@ void luaD_call (lua_State *L, StkId func, int nresults) {
       f = fvalue(s2v(func));
      Cfunc: {
       int n;  /* number of returns */
-      CallInfo *ci;
+      CallInfo *ci = next_ci(L);
       checkstackp(L, LUA_MINSTACK, func);  /* ensure minimum stack size */
-      ci = next_ci(L);
       ci->nresults = nresults;
       ci->callstatus = CIST_C;
       ci->top = L->top + LUA_MINSTACK;
       ci->func = func;
+      L->ci = ci;
       lua_assert(ci->top <= L->stack_last);
       if (L->hookmask & LUA_MASKCALL) {
         int narg = cast_int(L->top - func) - 1;
@@ -486,18 +486,18 @@ void luaD_call (lua_State *L, StkId func, int nresults) {
       break;
     }
     case LUA_VLCL: {  /* Lua function */
-      CallInfo *ci;
+      CallInfo *ci = next_ci(L);
       Proto *p = clLvalue(s2v(func))->p;
       int narg = cast_int(L->top - func) - 1;  /* number of real arguments */
       int nfixparams = p->numparams;
       int fsize = p->maxstacksize;  /* frame size */
       checkstackp(L, fsize, func);
-      ci = next_ci(L);
       ci->nresults = nresults;
       ci->u.l.savedpc = p->code;  /* starting point */
       ci->callstatus = 0;
       ci->top = func + 1 + fsize;
       ci->func = func;
+      L->ci = ci;
       for (; narg < nfixparams; narg++)
         setnilvalue(s2v(L->top++));  /* complete missing arguments */
       lua_assert(ci->top <= L->stack_last);

lua-5.4.0/liolib.c

@@ -270,6 +270,7 @@ static int io_open (lua_State *L) {
 */
 static int io_pclose (lua_State *L) {
   LStream *p = tolstream(L);
+  errno = 0;
   return luaL_execresult(L, l_pclose(L, p->f));
 }
 

lua-5.4.0/lobject.h

@@ -356,7 +356,7 @@ typedef struct GCObject {
 
 
 /*
-** Header for string value; string bytes follow the end of this structure.
+** Header for a string value.
 */
 typedef struct TString {
   CommonHeader;
@@ -367,16 +367,15 @@ typedef struct TString {
     size_t lnglen;  /* length for long strings */
     struct TString *hnext;  /* linked list for hash table */
   } u;
+  char contents[1];
 } TString;
 
 
 
 /*
 ** Get the actual string (array of bytes) from a 'TString'.
-** (Access to 'extra' ensures that value is really a 'TString'.)
 */
-#define getstr(ts)  \
-  check_exp(sizeof((ts)->extra), cast_charp((ts)) + sizeof(TString))
+#define getstr(ts)  ((ts)->contents)
 
 
 /* get the actual string (array of bytes) from a Lua value */

lua-5.4.0/loslib.c

@@ -10,6 +10,7 @@
 #include "lprefix.h"
 
 
+#include <errno.h>
 #include <locale.h>
 #include <stdlib.h>
 #include <string.h>
@@ -138,10 +139,11 @@
 
 
 
-
 static int os_execute (lua_State *L) {
   const char *cmd = luaL_optstring(L, 1, NULL);
-  int stat = system(cmd);
+  int stat;
+  errno = 0;
+  stat = system(cmd);
   if (cmd != NULL)
     return luaL_execresult(L, stat);
   else {

lua-5.4.0/lparser.c

@@ -212,27 +212,28 @@ static int new_localvar (LexState *ls, TString *name) {
 
 
 /*
-** Return the "variable description" (Vardesc) of a given
-** variable
+** Return the "variable description" (Vardesc) of a given variable.
+** (Unless noted otherwise, all variables are referred to by their
+** compiler indices.)
 */
-static Vardesc *getlocalvardesc (FuncState *fs, int i) {
-  return &fs->ls->dyd->actvar.arr[fs->firstlocal + i];
+static Vardesc *getlocalvardesc (FuncState *fs, int vidx) {
+  return &fs->ls->dyd->actvar.arr[fs->firstlocal + vidx];
 }
 
 
 /*
-** Convert 'nvar' (number of active variables at some point) to
-** number of variables in the stack at that point.
+** Convert 'nvar', a compiler index level, to it corresponding
+** stack index level. For that, search for the highest variable
+** below that level that is in the stack and uses its stack
+** index ('sidx').
 */
 static int stacklevel (FuncState *fs, int nvar) {
-  while (nvar > 0) {
-    Vardesc *vd = getlocalvardesc(fs, nvar - 1);
+  while (nvar-- > 0) {
+    Vardesc *vd = getlocalvardesc(fs, nvar);  /* get variable */
     if (vd->vd.kind != RDKCTC)  /* is in the stack? */
       return vd->vd.sidx + 1;
-    else
-      nvar--;  /* try previous variable */
   }
-  return 0;  /* no variables */
+  return 0;  /* no variables in the stack */
 }
 
 
@@ -245,10 +246,10 @@ int luaY_nvarstack (FuncState *fs) {
 
 
 /*
-** Get the debug-information entry for current variable 'i'.
+** Get the debug-information entry for current variable 'vidx'.
 */
-static LocVar *localdebuginfo (FuncState *fs, int i) {
-  Vardesc *vd = getlocalvardesc(fs, i);
+static LocVar *localdebuginfo (FuncState *fs, int vidx) {
+  Vardesc *vd = getlocalvardesc(fs,  vidx);
   if (vd->vd.kind == RDKCTC)
     return NULL;  /* no debug info. for constants */
   else {
@@ -259,14 +260,20 @@ static LocVar *localdebuginfo (FuncState *fs, int i) {
 }
 
 
-static void init_var (FuncState *fs, expdesc *e, int i) {
+/*
+** Create an expression representing variable 'vidx'
+*/
+static void init_var (FuncState *fs, expdesc *e, int vidx) {
   e->f = e->t = NO_JUMP;
   e->k = VLOCAL;
-  e->u.var.vidx = i;
-  e->u.var.sidx = getlocalvardesc(fs, i)->vd.sidx;
+  e->u.var.vidx = vidx;
+  e->u.var.sidx = getlocalvardesc(fs, vidx)->vd.sidx;
 }
 
 
+/*
+** Raises an error if variable described by 'e' is read only
+*/
 static void check_readonly (LexState *ls, expdesc *e) {
   FuncState *fs = ls->fs;
   TString *varname = NULL;  /* to be set if variable is const */
@@ -306,8 +313,8 @@ static void adjustlocalvars (LexState *ls, int nvars) {
   int stklevel = luaY_nvarstack(fs);
   int i;
   for (i = 0; i < nvars; i++) {
-    int varidx = fs->nactvar++;
-    Vardesc *var = getlocalvardesc(fs, varidx);
+    int vidx = fs->nactvar++;
+    Vardesc *var = getlocalvardesc(fs, vidx);
     var->vd.sidx = stklevel++;
     var->vd.pidx = registerlocalvar(ls, fs, var->vd.name);
   }
@@ -377,7 +384,8 @@ static int newupvalue (FuncState *fs, TString *name, expdesc *v) {
 
 /*
 ** Look for an active local variable with the name 'n' in the
-** function 'fs'.
+** function 'fs'. If found, initialize 'var' with it and return
+** its expression kind; otherwise return -1.
 */
 static int searchvar (FuncState *fs, TString *n, expdesc *var) {
   int i;
@@ -1592,7 +1600,7 @@ static void forlist (LexState *ls, TString *indexname) {
   line = ls->linenumber;
   adjust_assign(ls, 4, explist(ls, &e), &e);
   adjustlocalvars(ls, 4);  /* control variables */
-  markupval(fs, luaY_nvarstack(fs));  /* state may create an upvalue */
+  markupval(fs, fs->nactvar);  /* last control var. must be closed */
   luaK_checkstack(fs, 3);  /* extra space to call generator */
   forbody(ls, base, line, nvars - 4, 1);
 }
@@ -1730,7 +1738,7 @@ static int getlocalattribute (LexState *ls) {
       luaK_semerror(ls,
         luaO_pushfstring(ls->L, "unknown attribute '%s'", attr));
   }
-  return VDKREG;
+  return VDKREG;  /* regular variable */
 }
 
 
@@ -1739,7 +1747,7 @@ static void checktoclose (LexState *ls, int level) {
     FuncState *fs = ls->fs;
     markupval(fs, level + 1);
     fs->bl->insidetbc = 1;  /* in the scope of a to-be-closed variable */
-    luaK_codeABC(fs, OP_TBC, level, 0, 0);
+    luaK_codeABC(fs, OP_TBC, stacklevel(fs, level), 0, 0);
   }
 }
 
@@ -1749,18 +1757,18 @@ static void localstat (LexState *ls) {
   FuncState *fs = ls->fs;
   int toclose = -1;  /* index of to-be-closed variable (if any) */
   Vardesc *var;  /* last variable */
-  int ivar, kind;  /* index and kind of last variable */
+  int vidx, kind;  /* index and kind of last variable */
   int nvars = 0;
   int nexps;
   expdesc e;
   do {
-    ivar = new_localvar(ls, str_checkname(ls));
+    vidx = new_localvar(ls, str_checkname(ls));
     kind = getlocalattribute(ls);
-    getlocalvardesc(fs, ivar)->vd.kind = kind;
+    getlocalvardesc(fs, vidx)->vd.kind = kind;
     if (kind == RDKTOCLOSE) {  /* to-be-closed? */
       if (toclose != -1)  /* one already present? */
         luaK_semerror(ls, "multiple to-be-closed variables in local list");
-      toclose = luaY_nvarstack(fs) + nvars;
+      toclose = fs->nactvar + nvars;
     }
     nvars++;
   } while (testnext(ls, ','));
@@ -1770,7 +1778,7 @@ static void localstat (LexState *ls) {
     e.k = VVOID;
     nexps = 0;
   }
-  var = getlocalvardesc(fs, ivar);  /* get last variable */
+  var = getlocalvardesc(fs, vidx);  /* get last variable */
   if (nvars == nexps &&  /* no adjustments? */
       var->vd.kind == RDKCONST &&  /* last variable is const? */
       luaK_exp2const(fs, &e, &var->k)) {  /* compile-time constant? */

lua-5.4.0/lparser.h

@@ -77,7 +77,7 @@ typedef struct expdesc {
     } ind;
     struct {  /* for local variables */
       lu_byte sidx;  /* index in the stack */
-      unsigned short vidx;  /* index in 'actvar.arr'  */
+      unsigned short vidx;  /* compiler index (in 'actvar.arr')  */
     } var;
   } u;
   int t;  /* patch list of 'exit when true' */
@@ -125,7 +125,7 @@ typedef struct Labellist {
 
 /* dynamic structures used by the parser */
 typedef struct Dyndata {
-  struct {  /* list of active local variables */
+  struct {  /* list of all active local variables */
     Vardesc *arr;
     int n;
     int size;