1997-09-16 23:25:59 +04:00
|
|
|
/*
|
2005-01-05 21:20:51 +03:00
|
|
|
** $Id: ltable.c,v 2.13 2005/01/04 15:55:12 roberto Exp roberto $
|
1997-09-16 23:25:59 +04:00
|
|
|
** Lua tables (hash)
|
|
|
|
** See Copyright Notice in lua.h
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
1999-10-14 23:13:31 +04:00
|
|
|
/*
|
2001-10-25 23:14:14 +04:00
|
|
|
** Implementation of tables (aka arrays, objects, or hash tables).
|
|
|
|
** Tables keep its elements in two parts: an array part and a hash part.
|
|
|
|
** Non-negative integer keys are all candidates to be kept in the array
|
|
|
|
** part. The actual size of the array is the largest `n' such that at
|
|
|
|
** least half the slots between 0 and n are in use.
|
|
|
|
** Hash uses a mix of chained scatter table with Brent's variation.
|
1999-10-14 23:13:31 +04:00
|
|
|
** A main invariant of these tables is that, if an element is not
|
|
|
|
** in its main position (i.e. the `original' position that its hash gives
|
|
|
|
** to it), then the colliding element is in its own main position.
|
2003-11-27 21:05:14 +03:00
|
|
|
** Hence even when the load factor reaches 100%, performance remains good.
|
1999-10-14 23:13:31 +04:00
|
|
|
*/
|
|
|
|
|
2003-03-24 17:18:42 +03:00
|
|
|
#include <string.h>
|
1999-10-14 23:13:31 +04:00
|
|
|
|
2002-12-04 20:38:31 +03:00
|
|
|
#define ltable_c
|
2004-05-01 00:13:38 +04:00
|
|
|
#define LUA_CORE
|
2001-10-25 23:14:14 +04:00
|
|
|
|
2000-06-12 17:52:05 +04:00
|
|
|
#include "lua.h"
|
|
|
|
|
2002-05-15 22:57:44 +04:00
|
|
|
#include "ldebug.h"
|
2001-01-24 18:45:33 +03:00
|
|
|
#include "ldo.h"
|
2002-08-30 23:09:21 +04:00
|
|
|
#include "lgc.h"
|
1997-09-16 23:25:59 +04:00
|
|
|
#include "lmem.h"
|
|
|
|
#include "lobject.h"
|
1997-11-19 20:29:23 +03:00
|
|
|
#include "lstate.h"
|
1997-09-16 23:25:59 +04:00
|
|
|
#include "ltable.h"
|
|
|
|
|
|
|
|
|
2001-10-25 23:14:14 +04:00
|
|
|
/*
|
|
|
|
** max size of array part is 2^MAXBITS
|
|
|
|
*/
|
2004-05-01 00:13:38 +04:00
|
|
|
#if LUA_BITSINT > 26
|
2004-11-24 21:55:42 +03:00
|
|
|
#define MAXBITS 26
|
2001-10-25 23:14:14 +04:00
|
|
|
#else
|
2004-05-01 00:13:38 +04:00
|
|
|
#define MAXBITS (LUA_BITSINT-2)
|
2001-10-25 23:14:14 +04:00
|
|
|
#endif
|
|
|
|
|
2003-04-28 17:31:46 +04:00
|
|
|
#define MAXASIZE (1 << MAXBITS)
|
2001-10-25 23:14:14 +04:00
|
|
|
|
1997-09-16 23:25:59 +04:00
|
|
|
|
2003-03-24 17:18:42 +03:00
|
|
|
#define hashpow2(t,n) (gnode(t, lmod((n), sizenode(t))))
|
2003-03-20 23:26:33 +03:00
|
|
|
|
2003-03-24 17:18:42 +03:00
|
|
|
#define hashstr(t,str) hashpow2(t, (str)->tsv.hash)
|
|
|
|
#define hashboolean(t,p) hashpow2(t, p)
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
** for some types, it is better to avoid modulus by power of 2, as
|
|
|
|
** they tend to have many 2 factors.
|
|
|
|
*/
|
|
|
|
#define hashmod(t,n) (gnode(t, ((n) % ((sizenode(t)-1)|1))))
|
|
|
|
|
|
|
|
|
|
|
|
#define hashpointer(t,p) hashmod(t, IntPoint(p))
|
|
|
|
|
2002-02-15 00:41:08 +03:00
|
|
|
|
|
|
|
/*
|
2003-03-24 17:18:42 +03:00
|
|
|
** number of ints inside a lua_Number
|
2002-02-15 00:41:08 +03:00
|
|
|
*/
|
2003-03-24 17:18:42 +03:00
|
|
|
#define numints cast(int, sizeof(lua_Number)/sizeof(int))
|
|
|
|
|
|
|
|
|
2005-01-05 21:20:51 +03:00
|
|
|
|
|
|
|
const Node luaH_dummynode = {
|
|
|
|
{{NULL}, LUA_TNIL}, /* value */
|
|
|
|
{{NULL}, LUA_TNIL, NULL} /* key */
|
|
|
|
};
|
|
|
|
|
|
|
|
|
2003-03-24 17:18:42 +03:00
|
|
|
/*
|
|
|
|
** hash for lua_Numbers
|
|
|
|
*/
|
|
|
|
static Node *hashnum (const Table *t, lua_Number n) {
|
|
|
|
unsigned int a[numints];
|
|
|
|
int i;
|
|
|
|
n += 1; /* normalize number (avoid -0) */
|
|
|
|
lua_assert(sizeof(a) <= sizeof(n));
|
|
|
|
memcpy(a, &n, sizeof(a));
|
|
|
|
for (i = 1; i < numints; i++) a[0] += a[i];
|
2003-04-28 23:26:16 +04:00
|
|
|
return hashmod(t, a[0]);
|
2003-03-24 17:18:42 +03:00
|
|
|
}
|
|
|
|
|
2001-01-10 21:56:11 +03:00
|
|
|
|
1997-09-16 23:25:59 +04:00
|
|
|
|
1999-10-14 23:13:31 +04:00
|
|
|
/*
|
|
|
|
** returns the `main' position of an element in a table (that is, the index
|
|
|
|
** of its hash value)
|
|
|
|
*/
|
2003-12-10 15:13:36 +03:00
|
|
|
Node *luaH_mainposition (const Table *t, const TValue *key) {
|
2001-07-06 00:31:14 +04:00
|
|
|
switch (ttype(key)) {
|
2003-03-24 17:18:42 +03:00
|
|
|
case LUA_TNUMBER:
|
|
|
|
return hashnum(t, nvalue(key));
|
2000-10-05 16:14:08 +04:00
|
|
|
case LUA_TSTRING:
|
2003-12-10 15:13:36 +03:00
|
|
|
return hashstr(t, rawtsvalue(key));
|
2001-12-12 01:48:44 +03:00
|
|
|
case LUA_TBOOLEAN:
|
|
|
|
return hashboolean(t, bvalue(key));
|
2002-07-17 20:25:13 +04:00
|
|
|
case LUA_TLIGHTUSERDATA:
|
2002-04-05 22:54:31 +04:00
|
|
|
return hashpointer(t, pvalue(key));
|
2002-09-02 23:54:49 +04:00
|
|
|
default:
|
|
|
|
return hashpointer(t, gcvalue(key));
|
1997-09-16 23:25:59 +04:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2001-10-25 23:14:14 +04:00
|
|
|
/*
|
|
|
|
** returns the index for `key' if `key' is an appropriate key to live in
|
|
|
|
** the array part of the table, -1 otherwise.
|
|
|
|
*/
|
2004-09-27 22:54:45 +04:00
|
|
|
static int arrayindex (const TValue *key) {
|
2002-08-05 18:50:39 +04:00
|
|
|
if (ttisnumber(key)) {
|
2003-04-28 17:31:46 +04:00
|
|
|
lua_Number n = nvalue(key);
|
2002-03-18 21:18:35 +03:00
|
|
|
int k;
|
2003-04-28 17:31:46 +04:00
|
|
|
lua_number2int(k, n);
|
|
|
|
if (cast(lua_Number, k) == nvalue(key))
|
2001-10-25 23:14:14 +04:00
|
|
|
return k;
|
|
|
|
}
|
|
|
|
return -1; /* `key' did not match some condition */
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
** returns the index of a `key' for table traversals. First goes all
|
|
|
|
** elements in the array part, then elements in the hash part. The
|
2004-12-04 21:10:22 +03:00
|
|
|
** beginning of a traversal is signalled by -1.
|
2001-10-25 23:14:14 +04:00
|
|
|
*/
|
2004-12-03 23:50:25 +03:00
|
|
|
static int findindex (lua_State *L, Table *t, StkId key) {
|
2000-08-31 18:08:27 +04:00
|
|
|
int i;
|
2002-08-05 18:50:39 +04:00
|
|
|
if (ttisnil(key)) return -1; /* first iteration */
|
2004-09-27 22:54:45 +04:00
|
|
|
i = arrayindex(key);
|
|
|
|
if (0 < i && i <= t->sizearray) /* is `key' inside array part? */
|
2001-11-16 19:29:51 +03:00
|
|
|
return i-1; /* yes; that's the index (corrected to C) */
|
2000-08-31 18:08:27 +04:00
|
|
|
else {
|
2004-12-04 21:10:22 +03:00
|
|
|
Node *n = luaH_mainposition(t, key);
|
|
|
|
do { /* check whether `key' is somewhere in the chain */
|
|
|
|
/* key may be dead already, but it is ok to use it in `next' */
|
|
|
|
if (luaO_rawequalObj(key2tval(n), key) ||
|
|
|
|
(ttype(gkey(n)) == LUA_TDEADKEY && iscollectable(key) &&
|
|
|
|
gcvalue(gkey(n)) == gcvalue(key))) {
|
|
|
|
i = n - gnode(t, 0); /* key index in hash table */
|
|
|
|
/* hash elements are numbered after array ones */
|
|
|
|
return i + t->sizearray;
|
|
|
|
}
|
|
|
|
else n = gnext(n);
|
|
|
|
} while (n);
|
|
|
|
luaG_runerror(L, "invalid key for `next'"); /* key not found */
|
|
|
|
return 0; /* to avoid warnings */
|
2000-08-31 18:08:27 +04:00
|
|
|
}
|
1997-09-16 23:25:59 +04:00
|
|
|
}
|
|
|
|
|
2000-08-31 18:08:27 +04:00
|
|
|
|
2002-11-07 18:37:10 +03:00
|
|
|
int luaH_next (lua_State *L, Table *t, StkId key) {
|
2004-12-03 23:50:25 +03:00
|
|
|
int i = findindex(L, t, key); /* find original element */
|
2001-10-25 23:14:14 +04:00
|
|
|
for (i++; i < t->sizearray; i++) { /* try first array part */
|
2002-08-05 18:50:39 +04:00
|
|
|
if (!ttisnil(&t->array[i])) { /* a non-nil value? */
|
2003-04-03 17:35:34 +04:00
|
|
|
setnvalue(key, cast(lua_Number, i+1));
|
2003-12-10 15:13:36 +03:00
|
|
|
setobj2s(L, key+1, &t->array[i]);
|
2002-02-15 00:41:08 +03:00
|
|
|
return 1;
|
2001-10-25 23:14:14 +04:00
|
|
|
}
|
|
|
|
}
|
|
|
|
for (i -= t->sizearray; i < sizenode(t); i++) { /* then hash part */
|
2003-03-18 15:50:04 +03:00
|
|
|
if (!ttisnil(gval(gnode(t, i)))) { /* a non-nil value? */
|
2004-10-06 22:34:16 +04:00
|
|
|
setobj2s(L, key, key2tval(gnode(t, i)));
|
2003-12-10 15:13:36 +03:00
|
|
|
setobj2s(L, key+1, gval(gnode(t, i)));
|
2002-02-15 00:41:08 +03:00
|
|
|
return 1;
|
2001-10-25 23:14:14 +04:00
|
|
|
}
|
2001-01-29 16:14:49 +03:00
|
|
|
}
|
2002-02-15 00:41:08 +03:00
|
|
|
return 0; /* no more elements */
|
2001-01-29 16:14:49 +03:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2001-02-20 21:15:33 +03:00
|
|
|
/*
|
2001-10-25 23:14:14 +04:00
|
|
|
** {=============================================================
|
|
|
|
** Rehash
|
|
|
|
** ==============================================================
|
2001-02-20 21:15:33 +03:00
|
|
|
*/
|
2001-10-25 23:14:14 +04:00
|
|
|
|
|
|
|
|
2005-01-05 21:20:51 +03:00
|
|
|
static int computesizes (int nums[], int *narray) {
|
2002-01-26 00:51:33 +03:00
|
|
|
int i;
|
2005-01-05 21:20:51 +03:00
|
|
|
int twotoi; /* 2^i */
|
|
|
|
int a = 0; /* number of elements smaller than 2^i */
|
|
|
|
int na = 0; /* number of elements to go to array part */
|
|
|
|
int n = 0; /* optimal size for array part */
|
|
|
|
for (i = 0, twotoi = 1; twotoi/2 < *narray; i++, twotoi *= 2) {
|
2002-05-08 21:34:00 +04:00
|
|
|
if (nums[i] > 0) {
|
|
|
|
a += nums[i];
|
2005-01-05 21:20:51 +03:00
|
|
|
if (a > twotoi/2) { /* more than half elements present? */
|
|
|
|
n = twotoi; /* optimal size (till now) */
|
|
|
|
na = a; /* all elements smaller than n will go to array part */
|
2002-05-08 21:34:00 +04:00
|
|
|
}
|
2001-10-25 23:14:14 +04:00
|
|
|
}
|
2005-01-05 21:20:51 +03:00
|
|
|
if (a == *narray) break; /* all elements already counted */
|
2001-10-25 23:14:14 +04:00
|
|
|
}
|
2005-01-05 21:20:51 +03:00
|
|
|
*narray = n;
|
|
|
|
lua_assert(*narray/2 <= na && na <= *narray);
|
|
|
|
return na;
|
2001-10-25 23:14:14 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2005-01-04 18:55:12 +03:00
|
|
|
static int countint (const TValue *key, int *nums) {
|
|
|
|
int k = arrayindex(key);
|
|
|
|
if (0 < k && k <= MAXASIZE) { /* is `key' an appropriate array index? */
|
2005-01-05 21:20:51 +03:00
|
|
|
nums[ceillog2(k)]++; /* count as such */
|
2005-01-04 18:55:12 +03:00
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2005-01-05 21:20:51 +03:00
|
|
|
static int numusearray (const Table *t, int *nums) {
|
|
|
|
int lg;
|
|
|
|
int ttlg; /* 2^lg */
|
|
|
|
int ause = 0; /* summation of `nums' */
|
|
|
|
int i = 1; /* count to traverse all array keys */
|
|
|
|
for (lg=0, ttlg=1; lg<=MAXBITS; lg++, ttlg*=2) { /* for each slice */
|
|
|
|
int lc = 0; /* counter */
|
|
|
|
int lim = ttlg;
|
|
|
|
if (lim > t->sizearray) {
|
|
|
|
lim = t->sizearray; /* adjust upper limit */
|
|
|
|
if (i > lim)
|
|
|
|
break; /* no more elements to count */
|
2003-02-13 19:08:32 +03:00
|
|
|
}
|
2005-01-05 21:20:51 +03:00
|
|
|
/* count elements in range (2^(lg-1), 2^lg] */
|
|
|
|
for (; i <= lim; i++) {
|
|
|
|
if (!ttisnil(&t->array[i-1]))
|
|
|
|
lc++;
|
2003-02-13 19:08:32 +03:00
|
|
|
}
|
2005-01-05 21:20:51 +03:00
|
|
|
nums[lg] += lc;
|
|
|
|
ause += lc;
|
2001-10-25 23:14:14 +04:00
|
|
|
}
|
2005-01-05 21:20:51 +03:00
|
|
|
return ause;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static int numusehash (const Table *t, int *nums, int *pnasize) {
|
|
|
|
int totaluse = 0; /* total number of elements */
|
|
|
|
int ause = 0; /* summation of `nums' */
|
|
|
|
int i = sizenode(t);
|
2001-10-25 23:14:14 +04:00
|
|
|
while (i--) {
|
2003-02-20 23:12:39 +03:00
|
|
|
Node *n = &t->node[i];
|
2003-03-18 15:50:04 +03:00
|
|
|
if (!ttisnil(gval(n))) {
|
2005-01-05 21:20:51 +03:00
|
|
|
ause += countint(key2tval(n), nums);
|
2001-10-25 23:14:14 +04:00
|
|
|
totaluse++;
|
|
|
|
}
|
2001-02-20 21:15:33 +03:00
|
|
|
}
|
2005-01-05 21:20:51 +03:00
|
|
|
*pnasize += ause;
|
|
|
|
return totaluse;
|
2001-02-20 21:15:33 +03:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2001-10-25 23:14:14 +04:00
|
|
|
static void setarrayvector (lua_State *L, Table *t, int size) {
|
|
|
|
int i;
|
2003-12-10 15:13:36 +03:00
|
|
|
luaM_reallocvector(L, t->array, t->sizearray, size, TValue);
|
2001-10-25 23:14:14 +04:00
|
|
|
for (i=t->sizearray; i<size; i++)
|
|
|
|
setnilvalue(&t->array[i]);
|
|
|
|
t->sizearray = size;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2005-01-05 21:20:51 +03:00
|
|
|
static void setnodevector (lua_State *L, Table *t, int size) {
|
|
|
|
int lsize;
|
|
|
|
if (size == 0) { /* no elements to hash part? */
|
|
|
|
t->node = cast(Node *, &luaH_dummynode); /* use common `dummynode' */
|
|
|
|
lsize = 0;
|
2002-04-23 19:04:39 +04:00
|
|
|
}
|
|
|
|
else {
|
2005-01-05 21:20:51 +03:00
|
|
|
int i;
|
|
|
|
lsize = ceillog2(size);
|
|
|
|
if (lsize > MAXBITS)
|
|
|
|
luaG_runerror(L, "table overflow");
|
|
|
|
size = twoto(lsize);
|
2002-04-23 19:04:39 +04:00
|
|
|
t->node = luaM_newvector(L, size, Node);
|
|
|
|
for (i=0; i<size; i++) {
|
2004-10-06 22:34:16 +04:00
|
|
|
gnext(&t->node[i]) = NULL;
|
2003-03-18 15:50:04 +03:00
|
|
|
setnilvalue(gkey(gnode(t, i)));
|
|
|
|
setnilvalue(gval(gnode(t, i)));
|
2002-04-23 19:04:39 +04:00
|
|
|
}
|
1999-10-14 23:13:31 +04:00
|
|
|
}
|
2001-10-25 23:14:14 +04:00
|
|
|
t->lsizenode = cast(lu_byte, lsize);
|
2005-01-05 21:20:51 +03:00
|
|
|
t->lastfree = gnode(t, size); /* all positions are free */
|
1999-10-14 23:13:31 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2005-01-05 21:20:51 +03:00
|
|
|
static void resize (lua_State *L, Table *t, int nasize, int nhsize) {
|
2001-10-25 23:14:14 +04:00
|
|
|
int i;
|
2002-04-23 19:04:39 +04:00
|
|
|
int oldasize = t->sizearray;
|
|
|
|
int oldhsize = t->lsizenode;
|
2005-01-05 21:20:51 +03:00
|
|
|
Node *nold = t->node; /* save old hash ... */
|
2002-05-13 17:38:59 +04:00
|
|
|
if (nasize > oldasize) /* array part must grow? */
|
2001-10-25 23:14:14 +04:00
|
|
|
setarrayvector(L, t, nasize);
|
|
|
|
/* create new hash part with appropriate size */
|
2001-12-11 01:12:08 +03:00
|
|
|
setnodevector(L, t, nhsize);
|
2001-10-25 23:14:14 +04:00
|
|
|
if (nasize < oldasize) { /* array part must shrink? */
|
|
|
|
t->sizearray = nasize;
|
|
|
|
/* re-insert elements from vanishing slice */
|
|
|
|
for (i=nasize; i<oldasize; i++) {
|
2002-08-05 18:50:39 +04:00
|
|
|
if (!ttisnil(&t->array[i]))
|
2003-12-10 15:13:36 +03:00
|
|
|
setobjt2t(L, luaH_setnum(L, t, i+1), &t->array[i]);
|
2001-10-25 23:14:14 +04:00
|
|
|
}
|
2002-05-13 17:38:59 +04:00
|
|
|
/* shrink array */
|
2003-12-10 15:13:36 +03:00
|
|
|
luaM_reallocvector(L, t->array, oldasize, nasize, TValue);
|
2001-10-25 23:14:14 +04:00
|
|
|
}
|
2005-01-05 21:20:51 +03:00
|
|
|
/* re-insert elements from hash part */
|
2002-05-13 17:38:59 +04:00
|
|
|
for (i = twoto(oldhsize) - 1; i >= 0; i--) {
|
2001-10-25 23:14:14 +04:00
|
|
|
Node *old = nold+i;
|
2003-03-18 15:50:04 +03:00
|
|
|
if (!ttisnil(gval(old)))
|
2004-10-06 22:34:16 +04:00
|
|
|
setobjt2t(L, luaH_set(L, t, key2tval(old)), gval(old));
|
2001-10-25 23:14:14 +04:00
|
|
|
}
|
2005-01-05 21:20:51 +03:00
|
|
|
if (nold != &luaH_dummynode)
|
2002-04-23 19:04:39 +04:00
|
|
|
luaM_freearray(L, nold, twoto(oldhsize), Node); /* free old array */
|
2001-10-25 23:14:14 +04:00
|
|
|
}
|
|
|
|
|
2001-12-11 01:12:08 +03:00
|
|
|
|
2005-01-04 18:55:12 +03:00
|
|
|
void luaH_resizearray (lua_State *L, Table *t, int nasize) {
|
2005-01-05 21:20:51 +03:00
|
|
|
int nsize = (t->node == &luaH_dummynode) ? 0 : sizenode(t);
|
|
|
|
resize(L, t, nasize, nsize);
|
2005-01-04 18:55:12 +03:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static void rehash (lua_State *L, Table *t, const TValue *ek) {
|
2005-01-05 21:20:51 +03:00
|
|
|
int nasize, na;
|
|
|
|
int nums[MAXBITS+1]; /* nums[i] = number of keys between 2^(i-1) and 2^i */
|
|
|
|
int i;
|
|
|
|
int totaluse;
|
|
|
|
for (i=0; i<=MAXBITS; i++) nums[i] = 0; /* reset counts */
|
|
|
|
nasize = numusearray(t, nums); /* count keys in array part */
|
|
|
|
totaluse = nasize; /* all those keys are integer keys */
|
|
|
|
totaluse += numusehash(t, nums, &nasize); /* count keys in hash part */
|
|
|
|
/* count extra key */
|
|
|
|
nasize += countint(ek, nums);
|
|
|
|
totaluse++;
|
|
|
|
/* compute new size for array part */
|
|
|
|
na = computesizes(nums, &nasize);
|
2005-01-04 18:55:12 +03:00
|
|
|
/* resize the table to new computed sizes */
|
2005-01-05 21:20:51 +03:00
|
|
|
resize(L, t, nasize, totaluse - na);
|
2001-12-11 01:12:08 +03:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
2001-10-25 23:14:14 +04:00
|
|
|
/*
|
|
|
|
** }=============================================================
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
2005-01-04 18:55:12 +03:00
|
|
|
Table *luaH_new (lua_State *L, int narray, int nhash) {
|
2001-10-25 23:14:14 +04:00
|
|
|
Table *t = luaM_new(L, Table);
|
2003-12-10 15:13:36 +03:00
|
|
|
luaC_link(L, obj2gco(t), LUA_TTABLE);
|
2003-12-01 21:22:56 +03:00
|
|
|
t->metatable = NULL;
|
2002-06-25 00:18:38 +04:00
|
|
|
t->flags = cast(lu_byte, ~0);
|
2001-10-25 23:14:14 +04:00
|
|
|
/* temporary values (kept only if some malloc fails) */
|
|
|
|
t->array = NULL;
|
|
|
|
t->sizearray = 0;
|
|
|
|
t->lsizenode = 0;
|
2005-01-05 21:20:51 +03:00
|
|
|
t->node = cast(Node *, &luaH_dummynode);
|
2001-10-25 23:14:14 +04:00
|
|
|
setarrayvector(L, t, narray);
|
2005-01-05 21:20:51 +03:00
|
|
|
setnodevector(L, t, nhash);
|
1997-09-16 23:25:59 +04:00
|
|
|
return t;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2001-10-25 23:14:14 +04:00
|
|
|
void luaH_free (lua_State *L, Table *t) {
|
2005-01-05 21:20:51 +03:00
|
|
|
if (t->node != &luaH_dummynode)
|
2001-10-25 23:14:14 +04:00
|
|
|
luaM_freearray(L, t->node, sizenode(t), Node);
|
2003-12-10 15:13:36 +03:00
|
|
|
luaM_freearray(L, t->array, t->sizearray, TValue);
|
2004-11-24 22:20:21 +03:00
|
|
|
luaM_free(L, t);
|
1999-10-04 21:51:04 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2005-01-05 21:20:51 +03:00
|
|
|
static Node *getfreepos (lua_State *L, Table *t) {
|
|
|
|
while (t->lastfree-- > t->node) {
|
|
|
|
if (ttisnil(gkey(t->lastfree)))
|
|
|
|
return t->lastfree;
|
|
|
|
}
|
|
|
|
return NULL; /* could not find a free place */
|
|
|
|
}
|
|
|
|
|
|
|
|
|
1997-09-16 23:25:59 +04:00
|
|
|
|
1999-10-14 23:13:31 +04:00
|
|
|
/*
|
2001-01-10 21:56:11 +03:00
|
|
|
** inserts a new key into a hash table; first, check whether key's main
|
2001-01-26 17:16:35 +03:00
|
|
|
** position is free. If not, check whether colliding node is in its main
|
|
|
|
** position or not: if it is not, move colliding node to an empty place and
|
2001-01-10 21:56:11 +03:00
|
|
|
** put new key in its main position; otherwise (colliding node is in its main
|
|
|
|
** position), new key goes to an empty position.
|
1999-10-14 23:13:31 +04:00
|
|
|
*/
|
2003-12-10 15:13:36 +03:00
|
|
|
static TValue *newkey (lua_State *L, Table *t, const TValue *key) {
|
2001-07-06 00:31:14 +04:00
|
|
|
Node *mp = luaH_mainposition(t, key);
|
2005-01-05 21:20:51 +03:00
|
|
|
if (!ttisnil(gval(mp)) || mp == &luaH_dummynode) {
|
|
|
|
Node *othern;
|
|
|
|
Node *n = getfreepos(L, t); /* get a free place */
|
|
|
|
if (n == NULL) { /* cannot find a free place? */
|
|
|
|
rehash(L, t, key); /* grow table */
|
|
|
|
return luaH_set(L, t, key); /* re-insert key into grown table */
|
|
|
|
}
|
|
|
|
lua_assert(n != &luaH_dummynode);
|
|
|
|
othern = luaH_mainposition(t, key2tval(mp));
|
2001-01-10 21:56:11 +03:00
|
|
|
if (othern != mp) { /* is colliding node out of its main position? */
|
1999-10-14 23:13:31 +04:00
|
|
|
/* yes; move colliding node into free position */
|
2004-10-06 22:34:16 +04:00
|
|
|
while (gnext(othern) != mp) othern = gnext(othern); /* find previous */
|
|
|
|
gnext(othern) = n; /* redo the chain with `n' in place of `mp' */
|
1999-10-14 23:13:31 +04:00
|
|
|
*n = *mp; /* copy colliding node into free pos. (mp->next also goes) */
|
2004-10-06 22:34:16 +04:00
|
|
|
gnext(mp) = NULL; /* now `mp' is free */
|
2003-03-18 15:50:04 +03:00
|
|
|
setnilvalue(gval(mp));
|
1999-10-14 23:13:31 +04:00
|
|
|
}
|
|
|
|
else { /* colliding node is in its own main position */
|
|
|
|
/* new node will go into free position */
|
2004-10-06 22:34:16 +04:00
|
|
|
gnext(n) = gnext(mp); /* chain new position */
|
|
|
|
gnext(mp) = n;
|
1999-10-14 23:13:31 +04:00
|
|
|
mp = n;
|
|
|
|
}
|
|
|
|
}
|
2004-10-06 22:34:16 +04:00
|
|
|
gkey(mp)->value = key->value; gkey(mp)->tt = key->tt;
|
2004-08-10 23:17:23 +04:00
|
|
|
luaC_barriert(L, t, key);
|
2003-03-18 15:50:04 +03:00
|
|
|
lua_assert(ttisnil(gval(mp)));
|
2005-01-05 21:20:51 +03:00
|
|
|
return gval(mp);
|
1997-09-16 23:25:59 +04:00
|
|
|
}
|
1998-07-12 20:15:19 +04:00
|
|
|
|
|
|
|
|
2001-07-06 00:31:14 +04:00
|
|
|
/*
|
|
|
|
** search function for integers
|
|
|
|
*/
|
2003-12-10 15:13:36 +03:00
|
|
|
const TValue *luaH_getnum (Table *t, int key) {
|
2004-09-27 22:54:45 +04:00
|
|
|
/* (1 <= key && key <= t->sizearray) */
|
2004-11-24 22:16:03 +03:00
|
|
|
if (cast(unsigned int, key-1) < cast(unsigned int, t->sizearray))
|
2001-10-25 23:14:14 +04:00
|
|
|
return &t->array[key-1];
|
|
|
|
else {
|
2003-03-24 17:18:42 +03:00
|
|
|
lua_Number nk = cast(lua_Number, key);
|
|
|
|
Node *n = hashnum(t, nk);
|
2001-10-25 23:14:14 +04:00
|
|
|
do { /* check whether `key' is somewhere in the chain */
|
2003-03-24 17:18:42 +03:00
|
|
|
if (ttisnumber(gkey(n)) && nvalue(gkey(n)) == nk)
|
2003-03-18 15:50:04 +03:00
|
|
|
return gval(n); /* that's it */
|
2004-10-06 22:34:16 +04:00
|
|
|
else n = gnext(n);
|
2001-10-25 23:14:14 +04:00
|
|
|
} while (n);
|
|
|
|
return &luaO_nilobject;
|
|
|
|
}
|
1998-07-12 20:15:19 +04:00
|
|
|
}
|
|
|
|
|
2000-05-08 23:32:53 +04:00
|
|
|
|
2001-01-26 17:16:35 +03:00
|
|
|
/*
|
|
|
|
** search function for strings
|
|
|
|
*/
|
2003-12-10 15:13:36 +03:00
|
|
|
const TValue *luaH_getstr (Table *t, TString *key) {
|
2001-07-06 00:31:14 +04:00
|
|
|
Node *n = hashstr(t, key);
|
2001-01-10 21:56:11 +03:00
|
|
|
do { /* check whether `key' is somewhere in the chain */
|
2003-12-10 15:13:36 +03:00
|
|
|
if (ttisstring(gkey(n)) && rawtsvalue(gkey(n)) == key)
|
2003-03-18 15:50:04 +03:00
|
|
|
return gval(n); /* that's it */
|
2004-10-06 22:34:16 +04:00
|
|
|
else n = gnext(n);
|
2001-01-10 21:56:11 +03:00
|
|
|
} while (n);
|
2001-07-06 00:31:14 +04:00
|
|
|
return &luaO_nilobject;
|
2000-06-06 00:15:33 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2001-01-26 17:16:35 +03:00
|
|
|
/*
|
2001-07-06 00:31:14 +04:00
|
|
|
** main search function
|
2001-01-26 17:16:35 +03:00
|
|
|
*/
|
2003-12-10 15:13:36 +03:00
|
|
|
const TValue *luaH_get (Table *t, const TValue *key) {
|
2001-07-06 00:31:14 +04:00
|
|
|
switch (ttype(key)) {
|
2004-08-31 21:57:33 +04:00
|
|
|
case LUA_TNIL: return &luaO_nilobject;
|
2003-12-10 15:13:36 +03:00
|
|
|
case LUA_TSTRING: return luaH_getstr(t, rawtsvalue(key));
|
2001-07-06 00:31:14 +04:00
|
|
|
case LUA_TNUMBER: {
|
2002-03-18 21:18:35 +03:00
|
|
|
int k;
|
|
|
|
lua_number2int(k, (nvalue(key)));
|
2001-08-31 23:46:07 +04:00
|
|
|
if (cast(lua_Number, k) == nvalue(key)) /* is an integer index? */
|
2001-07-06 00:31:14 +04:00
|
|
|
return luaH_getnum(t, k); /* use specialized version */
|
|
|
|
/* else go through */
|
|
|
|
}
|
2004-08-31 21:57:33 +04:00
|
|
|
default: {
|
|
|
|
Node *n = luaH_mainposition(t, key);
|
|
|
|
do { /* check whether `key' is somewhere in the chain */
|
2004-10-06 22:34:16 +04:00
|
|
|
if (luaO_rawequalObj(key2tval(n), key))
|
|
|
|
return gval(n); /* that's it */
|
|
|
|
else n = gnext(n);
|
2004-08-31 21:57:33 +04:00
|
|
|
} while (n);
|
|
|
|
return &luaO_nilobject;
|
|
|
|
}
|
2001-07-06 00:31:14 +04:00
|
|
|
}
|
2001-01-26 17:16:35 +03:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2003-12-10 15:13:36 +03:00
|
|
|
TValue *luaH_set (lua_State *L, Table *t, const TValue *key) {
|
|
|
|
const TValue *p = luaH_get(t, key);
|
2002-05-28 00:35:40 +04:00
|
|
|
t->flags = 0;
|
|
|
|
if (p != &luaO_nilobject)
|
2003-12-10 15:13:36 +03:00
|
|
|
return cast(TValue *, p);
|
2001-10-25 23:14:14 +04:00
|
|
|
else {
|
2002-08-05 18:50:39 +04:00
|
|
|
if (ttisnil(key)) luaG_runerror(L, "table index is nil");
|
|
|
|
else if (ttisnumber(key) && nvalue(key) != nvalue(key))
|
2002-07-02 21:54:23 +04:00
|
|
|
luaG_runerror(L, "table index is NaN");
|
2002-05-28 00:35:40 +04:00
|
|
|
return newkey(L, t, key);
|
2001-08-31 00:56:43 +04:00
|
|
|
}
|
2001-07-06 00:31:14 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2003-12-10 15:13:36 +03:00
|
|
|
TValue *luaH_setnum (lua_State *L, Table *t, int key) {
|
|
|
|
const TValue *p = luaH_getnum(t, key);
|
2002-05-28 00:35:40 +04:00
|
|
|
if (p != &luaO_nilobject)
|
2003-12-10 15:13:36 +03:00
|
|
|
return cast(TValue *, p);
|
2001-10-25 23:14:14 +04:00
|
|
|
else {
|
2003-12-10 15:13:36 +03:00
|
|
|
TValue k;
|
2003-04-03 17:35:34 +04:00
|
|
|
setnvalue(&k, cast(lua_Number, key));
|
2002-05-28 00:35:40 +04:00
|
|
|
return newkey(L, t, &k);
|
2001-01-10 21:56:11 +03:00
|
|
|
}
|
2000-05-08 23:32:53 +04:00
|
|
|
}
|
2000-05-24 17:54:49 +04:00
|
|
|
|
2003-08-26 16:04:13 +04:00
|
|
|
|
2003-12-10 15:13:36 +03:00
|
|
|
TValue *luaH_setstr (lua_State *L, Table *t, TString *key) {
|
|
|
|
const TValue *p = luaH_getstr(t, key);
|
2003-08-26 16:04:13 +04:00
|
|
|
if (p != &luaO_nilobject)
|
2003-12-10 15:13:36 +03:00
|
|
|
return cast(TValue *, p);
|
2003-08-26 16:04:13 +04:00
|
|
|
else {
|
2003-12-10 15:13:36 +03:00
|
|
|
TValue k;
|
|
|
|
setsvalue(L, &k, key);
|
2003-08-26 16:04:13 +04:00
|
|
|
return newkey(L, t, &k);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|