1 files changed, 343 insertions, 117 deletions

diff --git a/apps/plugins/lua/lobject.h b/apps/plugins/lua/lobject.h
index 93288fe0fb..3a630b944c 100644
--- a/apps/plugins/lua/lobject.h
+++ b/apps/plugins/lua/lobject.h
@@ -1,5 +1,5 @@
 /*
-** $Id$
+** $Id: lobject.h,v 2.71.1.1 2013/04/12 18:48:47 roberto Exp $
 ** Type definitions for Lua objects
 ** See Copyright Notice in lua.h
 */
@@ -16,18 +16,52 @@
 #include "lua.h"
 
 
-/* tags for values visible from Lua */
-#define LAST_TAG        LUA_TTHREAD
+/*
+** Extra tags for non-values
+*/
+#define LUA_TPROTO      LUA_NUMTAGS
+#define LUA_TUPVAL      (LUA_NUMTAGS+1)
+#define LUA_TDEADKEY    (LUA_NUMTAGS+2)
 
-#define NUM_TAGS        (LAST_TAG+1)
+/*
+** number of all possible tags (including LUA_TNONE but excluding DEADKEY)
+*/
+#define LUA_TOTALTAGS   (LUA_TUPVAL+2)
 
 
 /*
-** Extra tags for non-values
+** 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
 */
-#define LUA_TPROTO      (LAST_TAG+1)
-#define LUA_TUPVAL      (LAST_TAG+2)
-#define LUA_TDEADKEY    (LAST_TAG+3)
+
+#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)
 
 
 /*
@@ -52,120 +86,165 @@ typedef struct GCheader {
 
 
 
-
 /*
 ** Union of all Lua values
 */
-typedef union {
-  GCObject *gc;
-  void *p;
-  lua_Number n;
-  int b;
-} Value;
+typedef union Value Value;
+
+
+#define numfield        lua_Number n;    /* numbers */
+
 
 
 /*
-** Tagged Values
+** Tagged Values. This is the basic representation of values in Lua,
+** an actual value plus a tag with its type.
 */
 
-#define TValuefields    Value value; int tt
+#define TValuefields    Value value_; int tt_
 
-typedef struct lua_TValue {
-  TValuefields;
-} TValue;
+typedef struct lua_TValue TValue;
+
+
+/* macro defining a nil value */
+#define NILCONSTANT     {NULL}, LUA_TNIL
+
+
+#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)))
 
 
 /* Macros to test type */
-#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)
+#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))
 
 /* Macros to access values */
-#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 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 tsvalue(o)      (&rawtsvalue(o)->tsv)
-#define rawuvalue(o)    check_exp(ttisuserdata(o), &(o)->value.gc->u)
+#define rawuvalue(o)    check_exp(ttisuserdata(o), &val_(o).gc->u)
 #define uvalue(o)       (&rawuvalue(o)->uv)
-#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 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 l_isfalse(o)    (ttisnil(o) || (ttisboolean(o) && bvalue(o) == 0))
 
-/*
-** for internal debug only
-*/
-#define checkconsistency(obj) \
-  lua_assert(!iscollectable(obj) || (ttype(obj) == (obj)->value.gc->gch.tt))
+
+#define iscollectable(o)        (rttype(o) & BIT_ISCOLLECTABLE)
+
+
+/* Macros for internal tests */
+#define righttt(obj)            (ttype(obj) == gcvalue(obj)->gch.tt)
 
 #define checkliveness(g,obj) \
-  lua_assert(!iscollectable(obj) || \
-  ((ttype(obj) == (obj)->value.gc->gch.tt) && !isdead(g, (obj)->value.gc)))
+        lua_longassert(!iscollectable(obj) || \
+                        (righttt(obj) && !isdead(g,gcvalue(obj))))
 
 
 /* Macros to set values */
-#define setnilvalue(obj) ((obj)->tt=LUA_TNIL)
+#define settt_(o,t)     ((o)->tt_=(t))
 
 #define setnvalue(obj,x) \
-  { TValue *i_o=(obj); i_o->value.n=(x); i_o->tt=LUA_TNUMBER; }
+  { 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); }
 
 #define setpvalue(obj,x) \
-  { TValue *i_o=(obj); i_o->value.p=(x); i_o->tt=LUA_TLIGHTUSERDATA; }
+  { TValue *io=(obj); val_(io).p=(x); settt_(io, LUA_TLIGHTUSERDATA); }
 
 #define setbvalue(obj,x) \
-  { TValue *i_o=(obj); i_o->value.b=(x); i_o->tt=LUA_TBOOLEAN; }
+  { 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)); }
 
 #define setsvalue(L,obj,x) \
-  { TValue *i_o=(obj); \
-    i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TSTRING; \
-    checkliveness(G(L),i_o); }
+  { TValue *io=(obj); \
+    TString *x_ = (x); \
+    val_(io).gc=cast(GCObject *, x_); settt_(io, ctb(x_->tsv.tt)); \
+    checkliveness(G(L),io); }
 
 #define setuvalue(L,obj,x) \
-  { TValue *i_o=(obj); \
-    i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TUSERDATA; \
-    checkliveness(G(L),i_o); }
+  { TValue *io=(obj); \
+    val_(io).gc=cast(GCObject *, (x)); settt_(io, ctb(LUA_TUSERDATA)); \
+    checkliveness(G(L),io); }
 
 #define setthvalue(L,obj,x) \
-  { TValue *i_o=(obj); \
-    i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TTHREAD; \
-    checkliveness(G(L),i_o); }
+  { TValue *io=(obj); \
+    val_(io).gc=cast(GCObject *, (x)); settt_(io, ctb(LUA_TTHREAD)); \
+    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 setclLvalue(L,obj,x) \
+  { TValue *io=(obj); \
+    val_(io).gc=cast(GCObject *, (x)); settt_(io, ctb(LUA_TLCL)); \
+    checkliveness(G(L),io); }
 
-#define sethvalue(L,obj,x) \
-  { TValue *i_o=(obj); \
-    i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TTABLE; \
-    checkliveness(G(L),i_o); }
+#define setclCvalue(L,obj,x) \
+  { TValue *io=(obj); \
+    val_(io).gc=cast(GCObject *, (x)); settt_(io, ctb(LUA_TCCL)); \
+    checkliveness(G(L),io); }
 
-#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 sethvalue(L,obj,x) \
+  { TValue *io=(obj); \
+    val_(io).gc=cast(GCObject *, (x)); settt_(io, ctb(LUA_TTABLE)); \
+    checkliveness(G(L),io); }
 
+#define setdeadvalue(obj)       settt_(obj, LUA_TDEADKEY)
 
 
 
 #define setobj(L,obj1,obj2) \
-  { const TValue *o2=(obj2); TValue *o1=(obj1); \
-    o1->value = o2->value; o1->tt=o2->tt; \
-    checkliveness(G(L),o1); }
+        { const TValue *io2=(obj2); TValue *io1=(obj1); \
+          io1->value_ = io2->value_; io1->tt_ = io2->tt_; \
+          checkliveness(G(L),io1); }
 
 
 /*
-** different types of sets, according to destination
+** different types of assignments, according to destination
 */
 
 /* from stack to (same) stack */
@@ -183,47 +262,204 @@ typedef struct lua_TValue {
 #define setobj2n        setobj
 #define setsvalue2n     setsvalue
 
-#define setttype(obj, tt) (ttype(obj) = (tt))
+
+/* 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 iscollectable(o)        (ttype(o) >= LUA_TSTRING)
+/* correspondence with standard representation */
+#undef val_
+#define val_(o)         v_(o)
+#undef num_
+#define num_(o)         d_(o)
 
 
+#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 */
 
 
+
+
 /*
-** String headers for string table
+** Header for string value; string bytes follow the end of this structure
 */
 typedef union TString {
   L_Umaxalign dummy;  /* ensures maximum alignment for strings */
   struct {
     CommonHeader;
-    lu_byte reserved;
+    lu_byte extra;  /* reserved words for short strings; "has hash" for longs */
     unsigned int hash;
-    size_t len;
+    size_t len;  /* number of characters in string */
   } tsv;
 } TString;
 
 
+/* get the actual string (array of bytes) from a TString */
 #define getstr(ts)      cast(const char *, (ts) + 1)
-#define svalue(o)       getstr(rawtsvalue(o))
 
+/* 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;
+    size_t len;  /* number of bytes */
   } 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
@@ -233,11 +469,12 @@ 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 */
-  struct LocVar *locvars;  /* information about local variables */
-  TString **upvalues;  /* upvalue names */
-  TString  *source;
-  int sizeupvalues;
+  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 sizek;  /* size of `k' */
   int sizecode;
   int sizelineinfo;
@@ -246,31 +483,16 @@ typedef struct Proto {
   int linedefined;
   int lastlinedefined;
   GCObject *gclist;
-  lu_byte nups;  /* number of upvalues */
-  lu_byte numparams;
+  lu_byte numparams;  /* number of fixed parameters */
   lu_byte is_vararg;
-  lu_byte maxstacksize;
+  lu_byte maxstacksize;  /* maximum stack used by this function */
 } 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;
-
-
 
 /*
-** Upvalues
+** Lua Upvalues
 */
-
 typedef struct UpVal {
   CommonHeader;
   TValue *v;  /* points to stack or to its own value */
@@ -289,20 +511,19 @@ typedef struct UpVal {
 */
 
 #define ClosureHeader \
-        CommonHeader; lu_byte isC; lu_byte nupvalues; GCObject *gclist; \
-        struct Table *env
+        CommonHeader; lu_byte nupvalues; GCObject *gclist
 
 typedef struct CClosure {
   ClosureHeader;
   lua_CFunction f;
-  TValue upvalue[1];
+  TValue upvalue[1];  /* list of upvalues */
 } CClosure;
 
 
 typedef struct LClosure {
   ClosureHeader;
   struct Proto *p;
-  UpVal *upvals[1];
+  UpVal *upvals[1];  /* list of upvalues */
 } LClosure;
 
 
@@ -312,8 +533,9 @@ typedef union Closure {
 } Closure;
 
 
-#define iscfunction(o)  (ttype(o) == LUA_TFUNCTION && clvalue(o)->c.isC)
-#define isLfunction(o)  (ttype(o) == LUA_TFUNCTION && !clvalue(o)->c.isC)
+#define isLfunction(o)  ttisLclosure(o)
+
+#define getproto(o)     (clLvalue(o)->p)
 
 
 /*
@@ -337,7 +559,7 @@ 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 */
@@ -360,17 +582,21 @@ 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_;
 
-#define ceillog2(x)     (luaO_log2((x)-1) + 1)
+LUAI_DDEC const TValue luaO_nilobject_;
+
 
-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_rawequalObj (const TValue *t1, const TValue *t2);
-LUAI_FUNC int luaO_str2d (const char *s, lua_Number *result);
+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 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, ...);