1 files changed, 117 insertions, 343 deletions

diff --git a/apps/plugins/lua/lobject.h b/apps/plugins/lua/lobject.h
index 3a630b944c..93288fe0fb 100644
--- a/apps/plugins/lua/lobject.h
+++ b/apps/plugins/lua/lobject.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lobject.h,v 2.71.1.1 2013/04/12 18:48:47 roberto Exp $
+** $Id$
 ** Type definitions for Lua objects
 ** See Copyright Notice in lua.h
 */
@@ -16,52 +16,18 @@
 #include "lua.h"
 
 
-/*
-** Extra tags for non-values
-*/
-#define LUA_TPROTO      LUA_NUMTAGS
-#define LUA_TUPVAL      (LUA_NUMTAGS+1)
-#define LUA_TDEADKEY    (LUA_NUMTAGS+2)
+/* tags for values visible from Lua */
+#define LAST_TAG        LUA_TTHREAD
 
-/*
-** number of all possible tags (including LUA_TNONE but excluding DEADKEY)
-*/
-#define LUA_TOTALTAGS   (LUA_TUPVAL+2)
+#define NUM_TAGS        (LAST_TAG+1)
 
 
 /*
-** tags for Tagged Values have the following use of bits:
-** bits 0-3: actual tag (a LUA_T* value)
-** bits 4-5: variant bits
-** bit 6: whether value is collectable
+** Extra tags for non-values
 */
-
-#define VARBITS         (3 << 4)
-
-
-/*
-** LUA_TFUNCTION variants:
-** 0 - Lua function
-** 1 - light C function
-** 2 - regular C function (closure)
-*/
-
-/* Variant tags for functions */
-#define LUA_TLCL        (LUA_TFUNCTION | (0 << 4))  /* Lua closure */
-#define LUA_TLCF        (LUA_TFUNCTION | (1 << 4))  /* light C function */
-#define LUA_TCCL        (LUA_TFUNCTION | (2 << 4))  /* C closure */
-
-
-/* Variant tags for strings */
-#define LUA_TSHRSTR     (LUA_TSTRING | (0 << 4))  /* short strings */
-#define LUA_TLNGSTR     (LUA_TSTRING | (1 << 4))  /* long strings */
-
-
-/* Bit mark for collectable types */
-#define BIT_ISCOLLECTABLE       (1 << 6)
-
-/* mark a tag as collectable */
-#define ctb(t)                  ((t) | BIT_ISCOLLECTABLE)
+#define LUA_TPROTO      (LAST_TAG+1)
+#define LUA_TUPVAL      (LAST_TAG+2)
+#define LUA_TDEADKEY    (LAST_TAG+3)
 
 
 /*
@@ -86,165 +52,120 @@ typedef struct GCheader {
 
 
 
+
 /*
 ** Union of all Lua values
 */
-typedef union Value Value;
-
-
-#define numfield        lua_Number n;    /* numbers */
-
+typedef union {
+  GCObject *gc;
+  void *p;
+  lua_Number n;
+  int b;
+} Value;
 
 
 /*
-** Tagged Values. This is the basic representation of values in Lua,
-** an actual value plus a tag with its type.
+** Tagged Values
 */
 
-#define TValuefields    Value value_; int tt_
-
-typedef struct lua_TValue TValue;
-
-
-/* macro defining a nil value */
-#define NILCONSTANT     {NULL}, LUA_TNIL
+#define TValuefields    Value value; int tt
 
-
-#define val_(o)         ((o)->value_)
-#define num_(o)         (val_(o).n)
-
-
-/* raw type tag of a TValue */
-#define rttype(o)       ((o)->tt_)
-
-/* tag with no variants (bits 0-3) */
-#define novariant(x)    ((x) & 0x0F)
-
-/* type tag of a TValue (bits 0-3 for tags + variant bits 4-5) */
-#define ttype(o)        (rttype(o) & 0x3F)
-
-/* type tag of a TValue with no variants (bits 0-3) */
-#define ttypenv(o)      (novariant(rttype(o)))
+typedef struct lua_TValue {
+  TValuefields;
+} TValue;
 
 
 /* Macros to test type */
-#define checktag(o,t)           (rttype(o) == (t))
-#define checktype(o,t)          (ttypenv(o) == (t))
-#define ttisnumber(o)           checktag((o), LUA_TNUMBER)
-#define ttisnil(o)              checktag((o), LUA_TNIL)
-#define ttisboolean(o)          checktag((o), LUA_TBOOLEAN)
-#define ttislightuserdata(o)    checktag((o), LUA_TLIGHTUSERDATA)
-#define ttisstring(o)           checktype((o), LUA_TSTRING)
-#define ttisshrstring(o)        checktag((o), ctb(LUA_TSHRSTR))
-#define ttislngstring(o)        checktag((o), ctb(LUA_TLNGSTR))
-#define ttistable(o)            checktag((o), ctb(LUA_TTABLE))
-#define ttisfunction(o)         checktype(o, LUA_TFUNCTION)
-#define ttisclosure(o)          ((rttype(o) & 0x1F) == LUA_TFUNCTION)
-#define ttisCclosure(o)         checktag((o), ctb(LUA_TCCL))
-#define ttisLclosure(o)         checktag((o), ctb(LUA_TLCL))
-#define ttislcf(o)              checktag((o), LUA_TLCF)
-#define ttisuserdata(o)         checktag((o), ctb(LUA_TUSERDATA))
-#define ttisthread(o)           checktag((o), ctb(LUA_TTHREAD))
-#define ttisdeadkey(o)          checktag((o), LUA_TDEADKEY)
-
-#define ttisequal(o1,o2)        (rttype(o1) == rttype(o2))
+#define ttisnil(o)      (ttype(o) == LUA_TNIL)
+#define ttisnumber(o)   (ttype(o) == LUA_TNUMBER)
+#define ttisstring(o)   (ttype(o) == LUA_TSTRING)
+#define ttistable(o)    (ttype(o) == LUA_TTABLE)
+#define ttisfunction(o) (ttype(o) == LUA_TFUNCTION)
+#define ttisboolean(o)  (ttype(o) == LUA_TBOOLEAN)
+#define ttisuserdata(o) (ttype(o) == LUA_TUSERDATA)
+#define ttisthread(o)   (ttype(o) == LUA_TTHREAD)
+#define ttislightuserdata(o)    (ttype(o) == LUA_TLIGHTUSERDATA)
 
 /* Macros to access values */
-#define nvalue(o)       check_exp(ttisnumber(o), num_(o))
-#define gcvalue(o)      check_exp(iscollectable(o), val_(o).gc)
-#define pvalue(o)       check_exp(ttislightuserdata(o), val_(o).p)
-#define rawtsvalue(o)   check_exp(ttisstring(o), &val_(o).gc->ts)
+#define ttype(o)        ((o)->tt)
+#define gcvalue(o)      check_exp(iscollectable(o), (o)->value.gc)
+#define pvalue(o)       check_exp(ttislightuserdata(o), (o)->value.p)
+#define nvalue(o)       check_exp(ttisnumber(o), (o)->value.n)
+#define rawtsvalue(o)   check_exp(ttisstring(o), &(o)->value.gc->ts)
 #define tsvalue(o)      (&rawtsvalue(o)->tsv)
-#define rawuvalue(o)    check_exp(ttisuserdata(o), &val_(o).gc->u)
+#define rawuvalue(o)    check_exp(ttisuserdata(o), &(o)->value.gc->u)
 #define uvalue(o)       (&rawuvalue(o)->uv)
-#define clvalue(o)      check_exp(ttisclosure(o), &val_(o).gc->cl)
-#define clLvalue(o)     check_exp(ttisLclosure(o), &val_(o).gc->cl.l)
-#define clCvalue(o)     check_exp(ttisCclosure(o), &val_(o).gc->cl.c)
-#define fvalue(o)       check_exp(ttislcf(o), val_(o).f)
-#define hvalue(o)       check_exp(ttistable(o), &val_(o).gc->h)
-#define bvalue(o)       check_exp(ttisboolean(o), val_(o).b)
-#define thvalue(o)      check_exp(ttisthread(o), &val_(o).gc->th)
-/* a dead value may get the 'gc' field, but cannot access its contents */
-#define deadvalue(o)    check_exp(ttisdeadkey(o), cast(void *, val_(o).gc))
+#define clvalue(o)      check_exp(ttisfunction(o), &(o)->value.gc->cl)
+#define hvalue(o)       check_exp(ttistable(o), &(o)->value.gc->h)
+#define bvalue(o)       check_exp(ttisboolean(o), (o)->value.b)
+#define thvalue(o)      check_exp(ttisthread(o), &(o)->value.gc->th)
 
 #define l_isfalse(o)    (ttisnil(o) || (ttisboolean(o) && bvalue(o) == 0))
 
-
-#define iscollectable(o)        (rttype(o) & BIT_ISCOLLECTABLE)
-
-
-/* Macros for internal tests */
-#define righttt(obj)            (ttype(obj) == gcvalue(obj)->gch.tt)
+/*
+** for internal debug only
+*/
+#define checkconsistency(obj) \
+  lua_assert(!iscollectable(obj) || (ttype(obj) == (obj)->value.gc->gch.tt))
 
 #define checkliveness(g,obj) \
-        lua_longassert(!iscollectable(obj) || \
-                        (righttt(obj) && !isdead(g,gcvalue(obj))))
+  lua_assert(!iscollectable(obj) || \
+  ((ttype(obj) == (obj)->value.gc->gch.tt) && !isdead(g, (obj)->value.gc)))
 
 
 /* Macros to set values */
-#define settt_(o,t)     ((o)->tt_=(t))
+#define setnilvalue(obj) ((obj)->tt=LUA_TNIL)
 
 #define setnvalue(obj,x) \
-  { TValue *io=(obj); num_(io)=(x); settt_(io, LUA_TNUMBER); }
-
-#define setnilvalue(obj) settt_(obj, LUA_TNIL)
-
-#define setfvalue(obj,x) \
-  { TValue *io=(obj); val_(io).f=(x); settt_(io, LUA_TLCF); }
+  { TValue *i_o=(obj); i_o->value.n=(x); i_o->tt=LUA_TNUMBER; }
 
 #define setpvalue(obj,x) \
-  { TValue *io=(obj); val_(io).p=(x); settt_(io, LUA_TLIGHTUSERDATA); }
+  { TValue *i_o=(obj); i_o->value.p=(x); i_o->tt=LUA_TLIGHTUSERDATA; }
 
 #define setbvalue(obj,x) \
-  { TValue *io=(obj); val_(io).b=(x); settt_(io, LUA_TBOOLEAN); }
-
-#define setgcovalue(L,obj,x) \
-  { TValue *io=(obj); GCObject *i_g=(x); \
-    val_(io).gc=i_g; settt_(io, ctb(gch(i_g)->tt)); }
+  { TValue *i_o=(obj); i_o->value.b=(x); i_o->tt=LUA_TBOOLEAN; }
 
 #define setsvalue(L,obj,x) \
-  { TValue *io=(obj); \
-    TString *x_ = (x); \
-    val_(io).gc=cast(GCObject *, x_); settt_(io, ctb(x_->tsv.tt)); \
-    checkliveness(G(L),io); }
+  { TValue *i_o=(obj); \
+    i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TSTRING; \
+    checkliveness(G(L),i_o); }
 
 #define setuvalue(L,obj,x) \
-  { TValue *io=(obj); \
-    val_(io).gc=cast(GCObject *, (x)); settt_(io, ctb(LUA_TUSERDATA)); \
-    checkliveness(G(L),io); }
+  { TValue *i_o=(obj); \
+    i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TUSERDATA; \
+    checkliveness(G(L),i_o); }
 
 #define setthvalue(L,obj,x) \
-  { TValue *io=(obj); \
-    val_(io).gc=cast(GCObject *, (x)); settt_(io, ctb(LUA_TTHREAD)); \
-    checkliveness(G(L),io); }
+  { TValue *i_o=(obj); \
+    i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TTHREAD; \
+    checkliveness(G(L),i_o); }
 
-#define setclLvalue(L,obj,x) \
-  { TValue *io=(obj); \
-    val_(io).gc=cast(GCObject *, (x)); settt_(io, ctb(LUA_TLCL)); \
-    checkliveness(G(L),io); }
-
-#define setclCvalue(L,obj,x) \
-  { TValue *io=(obj); \
-    val_(io).gc=cast(GCObject *, (x)); settt_(io, ctb(LUA_TCCL)); \
-    checkliveness(G(L),io); }
+#define setclvalue(L,obj,x) \
+  { TValue *i_o=(obj); \
+    i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TFUNCTION; \
+    checkliveness(G(L),i_o); }
 
 #define sethvalue(L,obj,x) \
-  { TValue *io=(obj); \
-    val_(io).gc=cast(GCObject *, (x)); settt_(io, ctb(LUA_TTABLE)); \
-    checkliveness(G(L),io); }
+  { TValue *i_o=(obj); \
+    i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TTABLE; \
+    checkliveness(G(L),i_o); }
+
+#define setptvalue(L,obj,x) \
+  { TValue *i_o=(obj); \
+    i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TPROTO; \
+    checkliveness(G(L),i_o); }
 
-#define setdeadvalue(obj)       settt_(obj, LUA_TDEADKEY)
 
 
 
 #define setobj(L,obj1,obj2) \
-        { const TValue *io2=(obj2); TValue *io1=(obj1); \
-          io1->value_ = io2->value_; io1->tt_ = io2->tt_; \
-          checkliveness(G(L),io1); }
+  { const TValue *o2=(obj2); TValue *o1=(obj1); \
+    o1->value = o2->value; o1->tt=o2->tt; \
+    checkliveness(G(L),o1); }
 
 
 /*
-** different types of assignments, according to destination
+** different types of sets, according to destination
 */
 
 /* from stack to (same) stack */
@@ -262,204 +183,47 @@ typedef struct lua_TValue TValue;
 #define setobj2n        setobj
 #define setsvalue2n     setsvalue
 
-
-/* check whether a number is valid (useful only for NaN trick) */
-#define luai_checknum(L,o,c)    { /* empty */ }
-
-
-/*
-** {======================================================
-** NaN Trick
-** =======================================================
-*/
-#if defined(LUA_NANTRICK)
-
-/*
-** numbers are represented in the 'd_' field. All other values have the
-** value (NNMARK | tag) in 'tt__'. A number with such pattern would be
-** a "signaled NaN", which is never generated by regular operations by
-** the CPU (nor by 'strtod')
-*/
-
-/* allows for external implementation for part of the trick */
-#if !defined(NNMARK)    /* { */
-
-
-#if !defined(LUA_IEEEENDIAN)
-#error option 'LUA_NANTRICK' needs 'LUA_IEEEENDIAN'
-#endif
-
-
-#define NNMARK          0x7FF7A500
-#define NNMASK          0x7FFFFF00
-
-#undef TValuefields
-#undef NILCONSTANT
-
-#if (LUA_IEEEENDIAN == 0)       /* { */
-
-/* little endian */
-#define TValuefields  \
-        union { struct { Value v__; int tt__; } i; double d__; } u
-#define NILCONSTANT     {{{NULL}, tag2tt(LUA_TNIL)}}
-/* field-access macros */
-#define v_(o)           ((o)->u.i.v__)
-#define d_(o)           ((o)->u.d__)
-#define tt_(o)          ((o)->u.i.tt__)
-
-#else                           /* }{ */
-
-/* big endian */
-#define TValuefields  \
-        union { struct { int tt__; Value v__; } i; double d__; } u
-#define NILCONSTANT     {{tag2tt(LUA_TNIL), {NULL}}}
-/* field-access macros */
-#define v_(o)           ((o)->u.i.v__)
-#define d_(o)           ((o)->u.d__)
-#define tt_(o)          ((o)->u.i.tt__)
-
-#endif                          /* } */
-
-#endif                  /* } */
+#define setttype(obj, tt) (ttype(obj) = (tt))
 
 
-/* correspondence with standard representation */
-#undef val_
-#define val_(o)         v_(o)
-#undef num_
-#define num_(o)         d_(o)
+#define iscollectable(o)        (ttype(o) >= LUA_TSTRING)
 
 
-#undef numfield
-#define numfield        /* no such field; numbers are the entire struct */
-
-/* basic check to distinguish numbers from non-numbers */
-#undef ttisnumber
-#define ttisnumber(o)   ((tt_(o) & NNMASK) != NNMARK)
-
-#define tag2tt(t)       (NNMARK | (t))
-
-#undef rttype
-#define rttype(o)       (ttisnumber(o) ? LUA_TNUMBER : tt_(o) & 0xff)
-
-#undef settt_
-#define settt_(o,t)     (tt_(o) = tag2tt(t))
-
-#undef setnvalue
-#define setnvalue(obj,x) \
-        { TValue *io_=(obj); num_(io_)=(x); lua_assert(ttisnumber(io_)); }
-
-#undef setobj
-#define setobj(L,obj1,obj2) \
-        { const TValue *o2_=(obj2); TValue *o1_=(obj1); \
-          o1_->u = o2_->u; \
-          checkliveness(G(L),o1_); }
-
-
-/*
-** these redefinitions are not mandatory, but these forms are more efficient
-*/
-
-#undef checktag
-#undef checktype
-#define checktag(o,t)   (tt_(o) == tag2tt(t))
-#define checktype(o,t)  (ctb(tt_(o) | VARBITS) == ctb(tag2tt(t) | VARBITS))
-
-#undef ttisequal
-#define ttisequal(o1,o2)  \
-        (ttisnumber(o1) ? ttisnumber(o2) : (tt_(o1) == tt_(o2)))
-
-
-#undef luai_checknum
-#define luai_checknum(L,o,c)    { if (!ttisnumber(o)) c; }
-
-#endif
-/* }====================================================== */
-
-
-
-/*
-** {======================================================
-** types and prototypes
-** =======================================================
-*/
-
-
-union Value {
-  GCObject *gc;    /* collectable objects */
-  void *p;         /* light userdata */
-  int b;           /* booleans */
-  lua_CFunction f; /* light C functions */
-  numfield         /* numbers */
-};
-
-
-struct lua_TValue {
-  TValuefields;
-};
-
 
 typedef TValue *StkId;  /* index to stack elements */
 
 
-
-
 /*
-** Header for string value; string bytes follow the end of this structure
+** String headers for string table
 */
 typedef union TString {
   L_Umaxalign dummy;  /* ensures maximum alignment for strings */
   struct {
     CommonHeader;
-    lu_byte extra;  /* reserved words for short strings; "has hash" for longs */
+    lu_byte reserved;
     unsigned int hash;
-    size_t len;  /* number of characters in string */
+    size_t len;
   } tsv;
 } TString;
 
 
-/* get the actual string (array of bytes) from a TString */
 #define getstr(ts)      cast(const char *, (ts) + 1)
-
-/* get the actual string (array of bytes) from a Lua value */
 #define svalue(o)       getstr(rawtsvalue(o))
 
 
-/*
-** Header for userdata; memory area follows the end of this structure
-*/
+
 typedef union Udata {
   L_Umaxalign dummy;  /* ensures maximum alignment for `local' udata */
   struct {
     CommonHeader;
     struct Table *metatable;
     struct Table *env;
-    size_t len;  /* number of bytes */
+    size_t len;
   } uv;
 } Udata;
 
 
 
-/*
-** Description of an upvalue for function prototypes
-*/
-typedef struct Upvaldesc {
-  TString *name;  /* upvalue name (for debug information) */
-  lu_byte instack;  /* whether it is in stack */
-  lu_byte idx;  /* index of upvalue (in stack or in outer function's list) */
-} Upvaldesc;
-
-
-/*
-** Description of a local variable for function prototypes
-** (used for debug information)
-*/
-typedef struct LocVar {
-  TString *varname;
-  int startpc;  /* first point where variable is active */
-  int endpc;    /* first point where variable is dead */
-} LocVar;
-
 
 /*
 ** Function Prototypes
@@ -469,12 +233,11 @@ typedef struct Proto {
   TValue *k;  /* constants used by the function */
   Instruction *code;
   struct Proto **p;  /* functions defined inside the function */
-  int *lineinfo;  /* map from opcodes to source lines (debug information) */
-  LocVar *locvars;  /* information about local variables (debug information) */
-  Upvaldesc *upvalues;  /* upvalue information */
-  union Closure *cache;  /* last created closure with this prototype */
-  TString  *source;  /* used for debug information */
-  int sizeupvalues;  /* size of 'upvalues' */
+  int *lineinfo;  /* map from opcodes to source lines */
+  struct LocVar *locvars;  /* information about local variables */
+  TString **upvalues;  /* upvalue names */
+  TString  *source;
+  int sizeupvalues;
   int sizek;  /* size of `k' */
   int sizecode;
   int sizelineinfo;
@@ -483,16 +246,31 @@ typedef struct Proto {
   int linedefined;
   int lastlinedefined;
   GCObject *gclist;
-  lu_byte numparams;  /* number of fixed parameters */
+  lu_byte nups;  /* number of upvalues */
+  lu_byte numparams;
   lu_byte is_vararg;
-  lu_byte maxstacksize;  /* maximum stack used by this function */
+  lu_byte maxstacksize;
 } Proto;
 
 
+/* masks for new-style vararg */
+#define VARARG_HASARG           1
+#define VARARG_ISVARARG         2
+#define VARARG_NEEDSARG         4
+
+
+typedef struct LocVar {
+  TString *varname;
+  int startpc;  /* first point where variable is active */
+  int endpc;    /* first point where variable is dead */
+} LocVar;
+
+
 
 /*
-** Lua Upvalues
+** Upvalues
 */
+
 typedef struct UpVal {
   CommonHeader;
   TValue *v;  /* points to stack or to its own value */
@@ -511,19 +289,20 @@ typedef struct UpVal {
 */
 
 #define ClosureHeader \
-        CommonHeader; lu_byte nupvalues; GCObject *gclist
+        CommonHeader; lu_byte isC; lu_byte nupvalues; GCObject *gclist; \
+        struct Table *env
 
 typedef struct CClosure {
   ClosureHeader;
   lua_CFunction f;
-  TValue upvalue[1];  /* list of upvalues */
+  TValue upvalue[1];
 } CClosure;
 
 
 typedef struct LClosure {
   ClosureHeader;
   struct Proto *p;
-  UpVal *upvals[1];  /* list of upvalues */
+  UpVal *upvals[1];
 } LClosure;
 
 
@@ -533,9 +312,8 @@ typedef union Closure {
 } Closure;
 
 
-#define isLfunction(o)  ttisLclosure(o)
-
-#define getproto(o)     (clLvalue(o)->p)
+#define iscfunction(o)  (ttype(o) == LUA_TFUNCTION && clvalue(o)->c.isC)
+#define isLfunction(o)  (ttype(o) == LUA_TFUNCTION && !clvalue(o)->c.isC)
 
 
 /*
@@ -559,7 +337,7 @@ typedef struct Node {
 
 typedef struct Table {
   CommonHeader;
-  lu_byte flags;  /* 1<<p means tagmethod(p) is not present */
+  lu_byte flags;  /* 1<<p means tagmethod(p) is not present */ 
   lu_byte lsizenode;  /* log2 of size of `node' array */
   struct Table *metatable;
   TValue *array;  /* array part */
@@ -582,21 +360,17 @@ typedef struct Table {
 #define sizenode(t)     (twoto((t)->lsizenode))
 
 
-/*
-** (address of) a fixed nil value
-*/
 #define luaO_nilobject          (&luaO_nilobject_)
 
+LUAI_DATA const TValue luaO_nilobject_;
 
-LUAI_DDEC const TValue luaO_nilobject_;
-
+#define ceillog2(x)     (luaO_log2((x)-1) + 1)
 
+LUAI_FUNC int luaO_log2 (unsigned int x);
 LUAI_FUNC int luaO_int2fb (unsigned int x);
 LUAI_FUNC int luaO_fb2int (int x);
-LUAI_FUNC int luaO_ceillog2 (unsigned int x);
-LUAI_FUNC lua_Number luaO_arith (int op, lua_Number v1, lua_Number v2);
-LUAI_FUNC int luaO_str2d (const char *s, size_t len, lua_Number *result);
-LUAI_FUNC int luaO_hexavalue (int c);
+LUAI_FUNC int luaO_rawequalObj (const TValue *t1, const TValue *t2);
+LUAI_FUNC int luaO_str2d (const char *s, lua_Number *result);
 LUAI_FUNC const char *luaO_pushvfstring (lua_State *L, const char *fmt,
                                                        va_list argp);
 LUAI_FUNC const char *luaO_pushfstring (lua_State *L, const char *fmt, ...);