first steps in the support of integers: basic representation + table indexing + basic API ops (tointeger/pushinteger) + equality + a few extra stuff

lobject.h

@@ -1,5 +1,5 @@
 /*
-** $Id: lobject.h,v 2.71 2012/09/11 18:21:44 roberto Exp roberto $
+** $Id: lobject.h,v 2.70 2012/05/11 14:10:50 roberto Exp $
 ** Type definitions for Lua objects
 ** See Copyright Notice in lua.h
 */
@@ -57,6 +57,11 @@
 #define LUA_TLNGSTR	(LUA_TSTRING | (1 << 4))  /* long strings */
 
 
+/* Variant tags for numbers */
+#define LUA_TNUMFLT	(LUA_TNUMBER | (0 << 4))  /* float numbers */
+#define LUA_TNUMINT	(LUA_TNUMBER | (1 << 4))  /* integer numbers */
+
+
 /* Bit mark for collectable types */
 #define BIT_ISCOLLECTABLE	(1 << 6)
 
@@ -92,8 +97,6 @@ typedef struct GCheader {
 typedef union Value Value;
 
 
-#define numfield	lua_Number n;    /* numbers */
-
 
 
 /*
@@ -111,7 +114,6 @@ typedef struct lua_TValue TValue;
 
 
 #define val_(o)		((o)->value_)
-#define num_(o)		(val_(o).n)
 
 
 /* raw type tag of a TValue */
@@ -130,7 +132,9 @@ typedef struct lua_TValue TValue;
 /* Macros to test type */
 #define checktag(o,t)		(rttype(o) == (t))
 #define checktype(o,t)		(ttnov(o) == (t))
-#define ttisnumber(o)		checktag((o), LUA_TNUMBER)
+#define ttisnumber(o)		checktype((o), LUA_TNUMBER)
+#define ttisfloat(o)		checktag((o), LUA_TNUMFLT)
+#define ttisinteger(o)		checktag((o), LUA_TNUMINT)
 #define ttisnil(o)		checktag((o), LUA_TNIL)
 #define ttisboolean(o)		checktag((o), LUA_TBOOLEAN)
 #define ttislightuserdata(o)	checktag((o), LUA_TLIGHTUSERDATA)
@@ -147,10 +151,13 @@ typedef struct lua_TValue TValue;
 #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 nvalue(o)	check_exp(ttisnumber(o), num_(o))
+#define nvalue(o)  \
+  check_exp(ttisnumber(o), (ttisfloat(o) ? val_(o).n : cast_num(val_(o).i)))
+
+#define ivalue(o)	check_exp(ttisinteger(o), val_(o).i)
+#define fltvalue(o)	check_exp(ttisfloat(o), val_(o).n)
 #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)
@@ -185,7 +192,10 @@ typedef struct lua_TValue TValue;
 #define settt_(o,t)	((o)->tt_=(t))
 
 #define setnvalue(obj,x) \
-  { TValue *io=(obj); num_(io)=(x); settt_(io, LUA_TNUMBER); }
+  { TValue *io=(obj); val_(io).n=(x); settt_(io, LUA_TNUMFLT); }
+
+#define setivalue(obj,x) \
+  { TValue *io=(obj); val_(io).i=(x); settt_(io, LUA_TNUMINT); }
 
 #define setnilvalue(obj) settt_(obj, LUA_TNIL)
 
@@ -267,115 +277,6 @@ typedef struct lua_TValue TValue;
 #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			/* } */
-
-
-/* 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
-/* }====================================================== */
-
 
 
 /*
@@ -390,7 +291,8 @@ union Value {
   void *p;         /* light userdata */
   int b;           /* booleans */
   lua_CFunction f; /* light C functions */
-  numfield         /* numbers */
+  lua_Integer i;   /* integer numbers */
+  lua_Number n;    /* float numbers */
 };
 
 

ltable.c

@@ -1,5 +1,5 @@
 /*
-** $Id: ltable.c,v 2.71 2012/05/23 15:37:09 roberto Exp roberto $
+** $Id: ltable.c,v 2.71 2012/05/23 15:37:09 roberto Exp $
 ** Lua tables (hash)
 ** See Copyright Notice in lua.h
 */
@@ -52,6 +52,7 @@
 
 #define hashstr(t,str)		hashpow2(t, (str)->tsv.hash)
 #define hashboolean(t,p)	hashpow2(t, p)
+#define hashint(t,i)		hashpow2(t, i)
 
 
 /*
@@ -96,8 +97,12 @@ static Node *hashnum (const Table *t, lua_Number n) {
 */
 static Node *mainposition (const Table *t, const TValue *key) {
   switch (ttype(key)) {
-    case LUA_TNUMBER:
-      return hashnum(t, nvalue(key));
+    case LUA_TNUMINT:
+      return hashint(t, ivalue(key));
+    case LUA_TNUMFLT:
+      return hashnum(t, fltvalue(key));
+    case LUA_TSHRSTR:
+      return hashstr(t, rawtsvalue(key));
     case LUA_TLNGSTR: {
       TString *s = rawtsvalue(key);
       if (s->tsv.extra == 0) {  /* no hash? */
@@ -106,8 +111,6 @@ static Node *mainposition (const Table *t, const TValue *key) {
       }
       return hashstr(t, rawtsvalue(key));
     }
-    case LUA_TSHRSTR:
-      return hashstr(t, rawtsvalue(key));
     case LUA_TBOOLEAN:
       return hashboolean(t, bvalue(key));
     case LUA_TLIGHTUSERDATA:
@@ -120,19 +123,24 @@ static Node *mainposition (const Table *t, const TValue *key) {
 }
 
 
+static int numisint (lua_Number n, int *p) {
+  int k;
+  lua_number2int(k, n);
+  if (luai_numeq(cast_num(k), n)) {  /* 'k' is int? */
+    *p = k;
+    return 1;
+  }
+  return 0;
+}
+
+
 /*
 ** returns the index for `key' if `key' is an appropriate key to live in
 ** the array part of the table, -1 otherwise.
 */
 static int arrayindex (const TValue *key) {
-  if (ttisnumber(key)) {
-    lua_Number n = nvalue(key);
-    int k;
-    lua_number2int(k, n);
-    if (luai_numeq(cast_num(k), n))
-      return k;
-  }
-  return -1;  /* `key' did not match some condition */
+  if (ttisinteger(key)) return ivalue(key);
+  else return -1;  /* `key' did not match some condition */
 }
 
 
@@ -170,7 +178,7 @@ int luaH_next (lua_State *L, Table *t, StkId key) {
   int i = findindex(L, t, key);  /* find original element */
   for (i++; i < t->sizearray; i++) {  /* try first array part */
     if (!ttisnil(&t->array[i])) {  /* a non-nil value? */
-      setnvalue(key, cast_num(i+1));
+      setivalue(key, i + 1);
       setobj2s(L, key+1, &t->array[i]);
       return 1;
     }
@@ -404,9 +412,18 @@ static Node *getfreepos (Table *t) {
 */
 TValue *luaH_newkey (lua_State *L, Table *t, const TValue *key) {
   Node *mp;
+  TValue aux;
   if (ttisnil(key)) luaG_runerror(L, "table index is nil");
-  else if (ttisnumber(key) && luai_numisnan(L, nvalue(key)))
-    luaG_runerror(L, "table index is NaN");
+  else if (ttisfloat(key)) {
+    lua_Number n = fltvalue(key);
+    int k;
+    if (luai_numisnan(L, n))
+      luaG_runerror(L, "table index is NaN");
+    if (numisint(n, &k)) {  /* index is int? */
+      setivalue(&aux, k); 
+      key = &aux;  /* insert it as an integer */
+    }
+  }
   mp = mainposition(t, key);
   if (!ttisnil(gval(mp)) || isdummy(mp)) {  /* main position is taken? */
     Node *othern;
@@ -448,10 +465,9 @@ const TValue *luaH_getint (Table *t, int key) {
   if (cast(unsigned int, key-1) < cast(unsigned int, t->sizearray))
     return &t->array[key-1];
   else {
-    lua_Number nk = cast_num(key);
-    Node *n = hashnum(t, nk);
+    Node *n = hashint(t, key);
     do {  /* check whether `key' is somewhere in the chain */
-      if (ttisnumber(gkey(n)) && luai_numeq(nvalue(gkey(n)), nk))
+      if (ttisinteger(gkey(n)) && ivalue(gkey(n)) == key)
         return gval(n);  /* that's it */
       else n = gnext(n);
     } while (n);
@@ -481,12 +497,11 @@ const TValue *luaH_getstr (Table *t, TString *key) {
 const TValue *luaH_get (Table *t, const TValue *key) {
   switch (ttype(key)) {
     case LUA_TSHRSTR: return luaH_getstr(t, rawtsvalue(key));
+    case LUA_TNUMINT: return luaH_getint(t, ivalue(key));
     case LUA_TNIL: return luaO_nilobject;
-    case LUA_TNUMBER: {
+    case LUA_TNUMFLT: {
       int k;
-      lua_Number n = nvalue(key);
-      lua_number2int(k, n);
-      if (luai_numeq(cast_num(k), n)) /* index is int? */
+      if (numisint(fltvalue(key), &k)) /* index is int? */
         return luaH_getint(t, k);  /* use specialized version */
       /* else go through */
     }
@@ -522,7 +537,7 @@ void luaH_setint (lua_State *L, Table *t, int key, TValue *value) {
     cell = cast(TValue *, p);
   else {
     TValue k;
-    setnvalue(&k, cast_num(key));
+    setivalue(&k, key);
     cell = luaH_newkey(L, t, &k);
   }
   setobj2t(L, cell, value);

lvm.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lvm.c,v 2.155 2013/03/16 21:10:18 roberto Exp roberto $
+** $Id: lvm.c,v 2.154 2012/08/16 17:34:28 roberto Exp $
 ** Lua virtual machine
 ** See Copyright Notice in lua.h
 */
@@ -34,7 +34,11 @@
 
 const TValue *luaV_tonumber (const TValue *obj, TValue *n) {
   lua_Number num;
-  if (ttisnumber(obj)) return obj;
+  if (ttisfloat(obj)) return obj;
+  if (ttisinteger(obj)) {
+    setnvalue(n, cast_num(ivalue(obj)));
+    return n;
+  }
   if (ttisstring(obj) && luaO_str2d(svalue(obj), tsvalue(obj)->len, &num)) {
     setnvalue(n, num);
     return n;
@@ -257,12 +261,19 @@ int luaV_lessequal (lua_State *L, const TValue *l, const TValue *r) {
 /*
 ** equality of Lua values. L == NULL means raw equality (no metamethods)
 */
-int luaV_equalobj_ (lua_State *L, const TValue *t1, const TValue *t2) {
+int luaV_equalobj (lua_State *L, const TValue *t1, const TValue *t2) {
   const TValue *tm;
-  lua_assert(ttisequal(t1, t2));
+  if (ttype(t1) != ttype(t2)) {
+    if (ttnov(t1) != ttnov(t2) || ttnov(t1) != LUA_TNUMBER)
+      return 0;  /* only numbers can be equal with different variants */
+    else  /* two numbers with different variants */
+      return luai_numeq(nvalue(t1), nvalue(t2));
+  }
+  /* values have same type and same variant */
   switch (ttype(t1)) {
     case LUA_TNIL: return 1;
-    case LUA_TNUMBER: return luai_numeq(nvalue(t1), nvalue(t2));
+    case LUA_TNUMINT: return (ivalue(t1) == ivalue(t2));
+    case LUA_TNUMFLT: return luai_numeq(fltvalue(t1), fltvalue(t2));
     case LUA_TBOOLEAN: return bvalue(t1) == bvalue(t2);  /* true must be 1 !! */
     case LUA_TLIGHTUSERDATA: return pvalue(t1) == pvalue(t2);
     case LUA_TLCF: return fvalue(t1) == fvalue(t2);
@@ -281,7 +292,6 @@ int luaV_equalobj_ (lua_State *L, const TValue *t1, const TValue *t2) {
       break;  /* will try TM */
     }
     default:
-      lua_assert(iscollectable(t1));
       return gcvalue(t1) == gcvalue(t2);
   }
   if (tm == NULL) return 0;  /* no TM? */
@@ -615,7 +625,13 @@ void luaV_execute (lua_State *L) {
         Protect(luaV_gettable(L, rb, RKC(i), ra));
       )
       vmcase(OP_ADD,
-        arith_op(luai_numadd, TM_ADD);
+        TValue *rb1 = RKB(i);
+        TValue *rc1 = RKC(i);
+        if (ttisinteger(rb1) && ttisinteger(rc1)) {
+          lua_Integer ib = ivalue(rb1); lua_Integer ic = ivalue(rc1);
+          setivalue(ra, ib + ic);
+        }
+        else arith_op(luai_numadd, TM_ADD);
       )
       vmcase(OP_SUB,
         arith_op(luai_numsub, TM_SUB);
@@ -669,7 +685,7 @@ void luaV_execute (lua_State *L) {
         TValue *rb = RKB(i);
         TValue *rc = RKC(i);
         Protect(
-          if (cast_int(equalobj(L, rb, rc)) != GETARG_A(i))
+          if (cast_int(luaV_equalobj(L, rb, rc)) != GETARG_A(i))
             ci->u.l.savedpc++;
           else
             donextjump(ci);

lvm.h

@@ -1,5 +1,5 @@
 /*
-** $Id: lvm.h,v 2.17 2011/05/31 18:27:56 roberto Exp roberto $
+** $Id: lvm.h,v 2.17 2011/05/31 18:27:56 roberto Exp $
 ** Lua virtual machine
 ** See Copyright Notice in lua.h
 */
@@ -15,17 +15,13 @@
 
 #define tostring(L,o) (ttisstring(o) || (luaV_tostring(L, o)))
 
-#define tonumber(o,n)	(ttisnumber(o) || (((o) = luaV_tonumber(o,n)) != NULL))
+#define tonumber(o,n)	(ttisfloat(o) || (((o) = luaV_tonumber(o,n)) != NULL))
 
-#define equalobj(L,o1,o2)  (ttisequal(o1, o2) && luaV_equalobj_(L, o1, o2))
 
-#define luaV_rawequalobj(o1,o2)		equalobj(NULL,o1,o2)
-
-
-/* not to called directly */
-LUAI_FUNC int luaV_equalobj_ (lua_State *L, const TValue *t1, const TValue *t2);
+#define luaV_rawequalobj(t1,t2)		luaV_equalobj(NULL,t1,t2)
 
 
+LUAI_FUNC int luaV_equalobj (lua_State *L, const TValue *t1, const TValue *t2);
 LUAI_FUNC int luaV_lessthan (lua_State *L, const TValue *l, const TValue *r);
 LUAI_FUNC int luaV_lessequal (lua_State *L, const TValue *l, const TValue *r);
 LUAI_FUNC const TValue *luaV_tonumber (const TValue *obj, TValue *n);