1 files changed, 13 insertions, 53 deletions

diff --git a/libs/liblua/src/lparser.c b/libs/liblua/src/lparser.c
index bc7d9a4f2d..77813a74e9 100644
--- a/libs/liblua/src/lparser.c
+++ b/libs/liblua/src/lparser.c
@@ -489,12 +489,10 @@ static void adjust_assign (LexState *ls, int nvars, int nexps, expdesc *e) {
 }
 
 
-/*
-** Macros to limit the maximum recursion depth while parsing
-*/
-#define enterlevel(ls)	luaE_enterCcall((ls)->L)
+#define enterlevel(ls)	luaE_incCstack(ls->L)
+
 
-#define leavelevel(ls)	luaE_exitCcall((ls)->L)
+#define leavelevel(ls) ((ls)->L->nCcalls--)
 
 
 /*
@@ -947,7 +945,7 @@ static void setvararg (FuncState *fs, int nparams) {
 
 
 static void parlist (LexState *ls) {
-  /* parlist -> [ param { ',' param } ] */
+  /* parlist -> [ {NAME ','} (NAME | '...') ] */
   FuncState *fs = ls->fs;
   Proto *f = fs->f;
   int nparams = 0;
@@ -955,12 +953,12 @@ static void parlist (LexState *ls) {
   if (ls->t.token != ')') {  /* is 'parlist' not empty? */
     do {
       switch (ls->t.token) {
-        case TK_NAME: {  /* param -> NAME */
+        case TK_NAME: {
           new_localvar(ls, str_checkname(ls));
           nparams++;
           break;
         }
-        case TK_DOTS: {  /* param -> '...' */
+        case TK_DOTS: {
           luaX_next(ls);
           isvararg = 1;
           break;
@@ -1625,59 +1623,21 @@ static void forstat (LexState *ls, int line) {
 }
 
 
-/*
-** Check whether next instruction is a single jump (a 'break', a 'goto'
-** to a forward label, or a 'goto' to a backward label with no variable
-** to close). If so, set the name of the 'label' it is jumping to
-** ("break" for a 'break') or to where it is jumping to ('target') and
-** return true. If not a single jump, leave input unchanged, to be
-** handled as a regular statement.
-*/
-static int issinglejump (LexState *ls, TString **label, int *target) {
-  if (testnext(ls, TK_BREAK)) {  /* a break? */
-    *label = luaS_newliteral(ls->L, "break");
-    return 1;
-  }
-  else if (ls->t.token != TK_GOTO || luaX_lookahead(ls) != TK_NAME)
-    return 0;  /* not a valid goto */
-  else {
-    TString *lname = ls->lookahead.seminfo.ts;  /* label's id */
-    Labeldesc *lb = findlabel(ls, lname);
-    if (lb) {  /* a backward jump? */
-      /* does it need to close variables? */
-      if (luaY_nvarstack(ls->fs) > stacklevel(ls->fs, lb->nactvar))
-        return 0;  /* not a single jump; cannot optimize */
-      *target = lb->pc;
-    }
-    else  /* jump forward */
-      *label = lname;
-    luaX_next(ls);  /* skip goto */
-    luaX_next(ls);  /* skip name */
-    return 1;
-  }
-}
-
-
 static void test_then_block (LexState *ls, int *escapelist) {
   /* test_then_block -> [IF | ELSEIF] cond THEN block */
   BlockCnt bl;
-  int line;
   FuncState *fs = ls->fs;
-  TString *jlb = NULL;
-  int target = NO_JUMP;
   expdesc v;
   int jf;  /* instruction to skip 'then' code (if condition is false) */
   luaX_next(ls);  /* skip IF or ELSEIF */
   expr(ls, &v);  /* read condition */
   checknext(ls, TK_THEN);
-  line = ls->linenumber;
-  if (issinglejump(ls, &jlb, &target)) {  /* 'if x then goto' ? */
-    luaK_goiffalse(ls->fs, &v);  /* will jump to label if condition is true */
+  if (ls->t.token == TK_BREAK) {  /* 'if x then break' ? */
+    int line = ls->linenumber;
+    luaK_goiffalse(ls->fs, &v);  /* will jump if condition is true */
+    luaX_next(ls);  /* skip 'break' */
     enterblock(fs, &bl, 0);  /* must enter block before 'goto' */
-    if (jlb != NULL)  /* forward jump? */
-      newgotoentry(ls, jlb, line, v.t);  /* will be resolved later */
-    else  /* backward jump */
-      luaK_patchlist(fs, v.t, target);  /* jump directly to 'target' */
+    newgotoentry(ls, luaS_newliteral(ls->L, "break"), line, v.t);
     while (testnext(ls, ';')) {}  /* skip semicolons */
     if (block_follow(ls, 0)) {  /* jump is the entire block? */
       leaveblock(fs);
@@ -1686,7 +1646,7 @@ static void test_then_block (LexState *ls, int *escapelist) {
     else  /* must skip over 'then' part if condition is false */
       jf = luaK_jump(fs);
   }
-  else {  /* regular case (not a jump) */
+  else {  /* regular case (not a break) */
     luaK_goiftrue(ls->fs, &v);  /* skip over block if condition is false */
     enterblock(fs, &bl, 0);
     jf = v.f;
@@ -1754,7 +1714,7 @@ static void checktoclose (LexState *ls, int level) {
 
 
 static void localstat (LexState *ls) {
-  /* stat -> LOCAL ATTRIB NAME {',' ATTRIB NAME} ['=' explist] */
+  /* stat -> LOCAL NAME ATTRIB { ',' NAME ATTRIB } ['=' explist] */
   FuncState *fs = ls->fs;
   int toclose = -1;  /* index of to-be-closed variable (if any) */
   Vardesc *var;  /* last variable */