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luau/VM/src/ltable.cpp
Arseny Kapoulkine d50b079325
Sync to upstream/release/509 (#303) 
- Rework transaction log used for type checking which should result in more robust type checking internals with fewer bugs
- Reduce the amount of memory consumed by type checker on large module graphs
- Type checker now errors on attempts to change the type of imported module fields
- The return type of newproxy is now any (fixes #296)
- Implement new number printing algorithm (Schubfach) which makes tostring() produce precise (round-trippable) and short decimal output up to 10x faster
- Fix lua_Debug::linedefined to point to the line with the function definition instead of the first statement (fixes #265)
- Fix minor bugs in Tab completion in Repl
- Repl now saves/restores command history in ~/.luau_history
2022-01-06 17:46:53 -08:00

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// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
// This code is based on Lua 5.x implementation licensed under MIT License; see lua_LICENSE.txt for details
/*
** 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.
** 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.
** Hence even when the load factor reaches 100%, performance remains good.
*/
#include "ltable.h"
#include "lstate.h"
#include "ldebug.h"
#include "lgc.h"
#include "lmem.h"
#include "lnumutils.h"
#include <string.h>
// max size of both array and hash part is 2^MAXBITS
#define MAXBITS 26
#define MAXSIZE (1 << MAXBITS)
static_assert(offsetof(LuaNode, val) == 0, "Unexpected Node memory layout, pointer cast in gval2slot is incorrect");
// TKey is bitpacked for memory efficiency so we need to validate bit counts for worst case
static_assert(TKey{{NULL}, {0}, LUA_TDEADKEY, 0}.tt == LUA_TDEADKEY, "not enough bits for tt");
static_assert(TKey{{NULL}, {0}, LUA_TNIL, MAXSIZE - 1}.next == MAXSIZE - 1, "not enough bits for next");
static_assert(TKey{{NULL}, {0}, LUA_TNIL, -(MAXSIZE - 1)}.next == -(MAXSIZE - 1), "not enough bits for next");
// reset cache of absent metamethods, cache is updated in luaT_gettm
#define invalidateTMcache(t) t->flags = 0
// empty hash data points to dummynode so that we can always dereference it
const LuaNode luaH_dummynode = {
{{NULL}, {0}, LUA_TNIL}, /* value */
{{NULL}, {0}, LUA_TNIL, 0} /* key */
};
#define dummynode (&luaH_dummynode)
// hash is always reduced mod 2^k
#define hashpow2(t, n) (gnode(t, lmod((n), sizenode(t))))
#define hashstr(t, str) hashpow2(t, (str)->hash)
#define hashboolean(t, p) hashpow2(t, p)
static LuaNode* hashpointer(const Table* t, const void* p)
{
// we discard the high 32-bit portion of the pointer on 64-bit platforms as it doesn't carry much entropy anyway
unsigned int h = unsigned(uintptr_t(p));
// MurmurHash3 32-bit finalizer
h ^= h >> 16;
h *= 0x85ebca6bu;
h ^= h >> 13;
h *= 0xc2b2ae35u;
h ^= h >> 16;
return hashpow2(t, h);
}
static LuaNode* hashnum(const Table* t, double n)
{
static_assert(sizeof(double) == sizeof(unsigned int) * 2, "expected a 8-byte double");
unsigned int i[2];
memcpy(i, &n, sizeof(i));
// mask out sign bit to make sure -0 and 0 hash to the same value
uint32_t h1 = i[0];
uint32_t h2 = i[1] & 0x7fffffff;
// finalizer from MurmurHash64B
const uint32_t m = 0x5bd1e995;
h1 ^= h2 >> 18;
h1 *= m;
h2 ^= h1 >> 22;
h2 *= m;
h1 ^= h2 >> 17;
h1 *= m;
h2 ^= h1 >> 19;
h2 *= m;
// ... truncated to 32-bit output (normally hash is equal to (uint64_t(h1) << 32) | h2, but we only really need the lower 32-bit half)
return hashpow2(t, h2);
}
static LuaNode* hashvec(const Table* t, const float* v)
{
unsigned int i[LUA_VECTOR_SIZE];
memcpy(i, v, sizeof(i));
// convert -0 to 0 to make sure they hash to the same value
i[0] = (i[0] == 0x8000000) ? 0 : i[0];
i[1] = (i[1] == 0x8000000) ? 0 : i[1];
i[2] = (i[2] == 0x8000000) ? 0 : i[2];
// scramble bits to make sure that integer coordinates have entropy in lower bits
i[0] ^= i[0] >> 17;
i[1] ^= i[1] >> 17;
i[2] ^= i[2] >> 17;
// Optimized Spatial Hashing for Collision Detection of Deformable Objects
unsigned int h = (i[0] * 73856093) ^ (i[1] * 19349663) ^ (i[2] * 83492791);
#if LUA_VECTOR_SIZE == 4
i[3] = (i[3] == 0x8000000) ? 0 : i[3];
i[3] ^= i[3] >> 17;
h ^= i[3] * 39916801;
#endif
return hashpow2(t, h);
}
/*
** returns the `main' position of an element in a table (that is, the index
** of its hash value)
*/
static LuaNode* mainposition(const Table* t, const TValue* key)
{
switch (ttype(key))
{
case LUA_TNUMBER:
return hashnum(t, nvalue(key));
case LUA_TVECTOR:
return hashvec(t, vvalue(key));
case LUA_TSTRING:
return hashstr(t, tsvalue(key));
case LUA_TBOOLEAN:
return hashboolean(t, bvalue(key));
case LUA_TLIGHTUSERDATA:
return hashpointer(t, pvalue(key));
default:
return hashpointer(t, gcvalue(key));
}
}
/*
** 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(double key)
{
int i;
luai_num2int(i, key);
return luai_numeq(cast_num(i), key) ? i : -1;
}
/*
** returns the index of a `key' for table traversals. First goes all
** elements in the array part, then elements in the hash part. The
** beginning of a traversal is signalled by -1.
*/
static int findindex(lua_State* L, Table* t, StkId key)
{
int i;
if (ttisnil(key))
return -1; /* first iteration */
i = ttisnumber(key) ? arrayindex(nvalue(key)) : -1;
if (0 < i && i <= t->sizearray) /* is `key' inside array part? */
return i - 1; /* yes; that's the index (corrected to C) */
else
{
LuaNode* n = mainposition(t, key);
for (;;)
{ /* check whether `key' is somewhere in the chain */
/* key may be dead already, but it is ok to use it in `next' */
if (luaO_rawequalKey(gkey(n), key) || (ttype(gkey(n)) == LUA_TDEADKEY && iscollectable(key) && gcvalue(gkey(n)) == gcvalue(key)))
{
i = cast_int(n - gnode(t, 0)); /* key index in hash table */
/* hash elements are numbered after array ones */
return i + t->sizearray;
}
if (gnext(n) == 0)
break;
n += gnext(n);
}
luaG_runerror(L, "invalid key to 'next'"); /* key not found */
}
}
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));
setobj2s(L, key + 1, &t->array[i]);
return 1;
}
}
for (i -= t->sizearray; i < sizenode(t); i++)
{ /* then hash part */
if (!ttisnil(gval(gnode(t, i))))
{ /* a non-nil value? */
getnodekey(L, key, gnode(t, i));
setobj2s(L, key + 1, gval(gnode(t, i)));
return 1;
}
}
return 0; /* no more elements */
}
/*
** {=============================================================
** Rehash
** ==============================================================
*/
#define maybesetaboundary(t, boundary) \
{ \
if (t->aboundary <= 0) \
t->aboundary = -int(boundary); \
}
#define getaboundary(t) (t->aboundary < 0 ? -t->aboundary : t->sizearray)
static int computesizes(int nums[], int* narray)
{
int i;
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)
{
if (nums[i] > 0)
{
a += nums[i];
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 */
}
}
if (a == *narray)
break; /* all elements already counted */
}
*narray = n;
LUAU_ASSERT(*narray / 2 <= na && na <= *narray);
return na;
}
static int countint(double key, int* nums)
{
int k = arrayindex(key);
if (0 < k && k <= MAXSIZE)
{ /* is `key' an appropriate array index? */
nums[ceillog2(k)]++; /* count as such */
return 1;
}
else
return 0;
}
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 */
}
/* count elements in range (2^(lg-1), 2^lg] */
for (; i <= lim; i++)
{
if (!ttisnil(&t->array[i - 1]))
lc++;
}
nums[lg] += lc;
ause += lc;
}
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);
while (i--)
{
LuaNode* n = &t->node[i];
if (!ttisnil(gval(n)))
{
if (ttisnumber(gkey(n)))
ause += countint(nvalue(gkey(n)), nums);
totaluse++;
}
}
*pnasize += ause;
return totaluse;
}
static void setarrayvector(lua_State* L, Table* t, int size)
{
if (size > MAXSIZE)
luaG_runerror(L, "table overflow");
luaM_reallocarray(L, t->array, t->sizearray, size, TValue, t->memcat);
TValue* array = t->array;
for (int i = t->sizearray; i < size; i++)
setnilvalue(&array[i]);
t->sizearray = size;
}
static void setnodevector(lua_State* L, Table* t, int size)
{
int lsize;
if (size == 0)
{ /* no elements to hash part? */
t->node = cast_to(LuaNode*, dummynode); /* use common `dummynode' */
lsize = 0;
}
else
{
int i;
lsize = ceillog2(size);
if (lsize > MAXBITS)
luaG_runerror(L, "table overflow");
size = twoto(lsize);
t->node = luaM_newarray(L, size, LuaNode, t->memcat);
for (i = 0; i < size; i++)
{
LuaNode* n = gnode(t, i);
gnext(n) = 0;
setnilvalue(gkey(n));
setnilvalue(gval(n));
}
}
t->lsizenode = cast_byte(lsize);
t->nodemask8 = cast_byte((1 << lsize) - 1);
t->lastfree = size; /* all positions are free */
}
static void resize(lua_State* L, Table* t, int nasize, int nhsize)
{
if (nasize > MAXSIZE || nhsize > MAXSIZE)
luaG_runerror(L, "table overflow");
int oldasize = t->sizearray;
int oldhsize = t->lsizenode;
LuaNode* nold = t->node; /* save old hash ... */
if (nasize > oldasize) /* array part must grow? */
setarrayvector(L, t, nasize);
/* create new hash part with appropriate size */
setnodevector(L, t, nhsize);
if (nasize < oldasize)
{ /* array part must shrink? */
t->sizearray = nasize;
/* re-insert elements from vanishing slice */
for (int i = nasize; i < oldasize; i++)
{
if (!ttisnil(&t->array[i]))
setobjt2t(L, luaH_setnum(L, t, i + 1), &t->array[i]);
}
/* shrink array */
luaM_reallocarray(L, t->array, oldasize, nasize, TValue, t->memcat);
}
/* re-insert elements from hash part */
for (int i = twoto(oldhsize) - 1; i >= 0; i--)
{
LuaNode* old = nold + i;
if (!ttisnil(gval(old)))
{
TValue ok;
getnodekey(L, &ok, old);
setobjt2t(L, luaH_set(L, t, &ok), gval(old));
}
}
if (nold != dummynode)
luaM_freearray(L, nold, twoto(oldhsize), LuaNode, t->memcat); /* free old array */
}
void luaH_resizearray(lua_State* L, Table* t, int nasize)
{
int nsize = (t->node == dummynode) ? 0 : sizenode(t);
resize(L, t, nasize, nsize);
}
void luaH_resizehash(lua_State* L, Table* t, int nhsize)
{
resize(L, t, t->sizearray, nhsize);
}
static void rehash(lua_State* L, Table* t, const TValue* ek)
{
int nums[MAXBITS + 1]; /* nums[i] = number of keys between 2^(i-1) and 2^i */
for (int i = 0; i <= MAXBITS; i++)
nums[i] = 0; /* reset counts */
int nasize = numusearray(t, nums); /* count keys in array part */
int totaluse = nasize; /* all those keys are integer keys */
totaluse += numusehash(t, nums, &nasize); /* count keys in hash part */
/* count extra key */
if (ttisnumber(ek))
nasize += countint(nvalue(ek), nums);
totaluse++;
/* compute new size for array part */
int na = computesizes(nums, &nasize);
/* resize the table to new computed sizes */
resize(L, t, nasize, totaluse - na);
}
/*
** }=============================================================
*/
Table* luaH_new(lua_State* L, int narray, int nhash)
{
Table* t = luaM_new(L, Table, sizeof(Table), L->activememcat);
luaC_link(L, t, LUA_TTABLE);
t->metatable = NULL;
t->flags = cast_byte(~0);
t->array = NULL;
t->sizearray = 0;
t->lastfree = 0;
t->lsizenode = 0;
t->readonly = 0;
t->safeenv = 0;
t->nodemask8 = 0;
t->node = cast_to(LuaNode*, dummynode);
if (narray > 0)
setarrayvector(L, t, narray);
if (nhash > 0)
setnodevector(L, t, nhash);
return t;
}
void luaH_free(lua_State* L, Table* t)
{
if (t->node != dummynode)
luaM_freearray(L, t->node, sizenode(t), LuaNode, t->memcat);
luaM_freearray(L, t->array, t->sizearray, TValue, t->memcat);
luaM_free(L, t, sizeof(Table), t->memcat);
}
static LuaNode* getfreepos(Table* t)
{
while (t->lastfree > 0)
{
t->lastfree--;
LuaNode* n = gnode(t, t->lastfree);
if (ttisnil(gkey(n)))
return n;
}
return NULL; /* could not find a free place */
}
/*
** inserts a new key into a hash table; first, check whether key's main
** 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
** put new key in its main position; otherwise (colliding node is in its main
** position), new key goes to an empty position.
*/
static TValue* newkey(lua_State* L, Table* t, const TValue* key)
{
LuaNode* mp = mainposition(t, key);
if (!ttisnil(gval(mp)) || mp == dummynode)
{
LuaNode* othern;
LuaNode* n = getfreepos(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 */
}
LUAU_ASSERT(n != dummynode);
TValue mk;
getnodekey(L, &mk, mp);
othern = mainposition(t, &mk);
if (othern != mp)
{ /* is colliding node out of its main position? */
/* yes; move colliding node into free position */
while (othern + gnext(othern) != mp)
othern += gnext(othern); /* find previous */
gnext(othern) = cast_int(n - othern); /* redo the chain with `n' in place of `mp' */
*n = *mp; /* copy colliding node into free pos. (mp->next also goes) */
if (gnext(mp) != 0)
{
gnext(n) += cast_int(mp - n); /* correct 'next' */
gnext(mp) = 0; /* now 'mp' is free */
}
setnilvalue(gval(mp));
}
else
{ /* colliding node is in its own main position */
/* new node will go into free position */
if (gnext(mp) != 0)
gnext(n) = cast_int((mp + gnext(mp)) - n); /* chain new position */
else
LUAU_ASSERT(gnext(n) == 0);
gnext(mp) = cast_int(n - mp);
mp = n;
}
}
setnodekey(L, mp, key);
luaC_barriert(L, t, key);
LUAU_ASSERT(ttisnil(gval(mp)));
return gval(mp);
}
/*
** search function for integers
*/
const TValue* luaH_getnum(Table* t, int key)
{
/* (1 <= key && key <= t->sizearray) */
if (cast_to(unsigned int, key - 1) < cast_to(unsigned int, t->sizearray))
return &t->array[key - 1];
else if (t->node != dummynode)
{
double nk = cast_num(key);
LuaNode* n = hashnum(t, nk);
for (;;)
{ /* check whether `key' is somewhere in the chain */
if (ttisnumber(gkey(n)) && luai_numeq(nvalue(gkey(n)), nk))
return gval(n); /* that's it */
if (gnext(n) == 0)
break;
n += gnext(n);
}
return luaO_nilobject;
}
else
return luaO_nilobject;
}
/*
** search function for strings
*/
const TValue* luaH_getstr(Table* t, TString* key)
{
LuaNode* n = hashstr(t, key);
for (;;)
{ /* check whether `key' is somewhere in the chain */
if (ttisstring(gkey(n)) && tsvalue(gkey(n)) == key)
return gval(n); /* that's it */
if (gnext(n) == 0)
break;
n += gnext(n);
}
return luaO_nilobject;
}
/*
** main search function
*/
const TValue* luaH_get(Table* t, const TValue* key)
{
switch (ttype(key))
{
case LUA_TNIL:
return luaO_nilobject;
case LUA_TSTRING:
return luaH_getstr(t, tsvalue(key));
case LUA_TNUMBER:
{
int k;
double n = nvalue(key);
luai_num2int(k, n);
if (luai_numeq(cast_num(k), nvalue(key))) /* index is int? */
return luaH_getnum(t, k); /* use specialized version */
/* else go through */
}
default:
{
LuaNode* n = mainposition(t, key);
for (;;)
{ /* check whether `key' is somewhere in the chain */
if (luaO_rawequalKey(gkey(n), key))
return gval(n); /* that's it */
if (gnext(n) == 0)
break;
n += gnext(n);
}
return luaO_nilobject;
}
}
}
TValue* luaH_set(lua_State* L, Table* t, const TValue* key)
{
const TValue* p = luaH_get(t, key);
invalidateTMcache(t);
if (p != luaO_nilobject)
return cast_to(TValue*, p);
else
{
if (ttisnil(key))
luaG_runerror(L, "table index is nil");
else if (ttisnumber(key) && luai_numisnan(nvalue(key)))
luaG_runerror(L, "table index is NaN");
else if (ttisvector(key) && luai_vecisnan(vvalue(key)))
luaG_runerror(L, "table index contains NaN");
return newkey(L, t, key);
}
}
TValue* luaH_setnum(lua_State* L, Table* t, int key)
{
/* (1 <= key && key <= t->sizearray) */
if (cast_to(unsigned int, key - 1) < cast_to(unsigned int, t->sizearray))
return &t->array[key - 1];
/* hash fallback */
const TValue* p = luaH_getnum(t, key);
if (p != luaO_nilobject)
return cast_to(TValue*, p);
else
{
TValue k;
setnvalue(&k, cast_num(key));
return newkey(L, t, &k);
}
}
TValue* luaH_setstr(lua_State* L, Table* t, TString* key)
{
const TValue* p = luaH_getstr(t, key);
invalidateTMcache(t);
if (p != luaO_nilobject)
return cast_to(TValue*, p);
else
{
TValue k;
setsvalue(L, &k, key);
return newkey(L, t, &k);
}
}
static LUAU_NOINLINE int unbound_search(Table* t, unsigned int j)
{
unsigned int i = j; /* i is zero or a present index */
j++;
/* find `i' and `j' such that i is present and j is not */
while (!ttisnil(luaH_getnum(t, j)))
{
i = j;
j *= 2;
if (j > cast_to(unsigned int, INT_MAX))
{ /* overflow? */
/* table was built with bad purposes: resort to linear search */
i = 1;
while (!ttisnil(luaH_getnum(t, i)))
i++;
return i - 1;
}
}
/* now do a binary search between them */
while (j - i > 1)
{
unsigned int m = (i + j) / 2;
if (ttisnil(luaH_getnum(t, m)))
j = m;
else
i = m;
}
return i;
}
static int updateaboundary(Table* t, int boundary)
{
if (boundary < t->sizearray && ttisnil(&t->array[boundary - 1]))
{
if (boundary >= 2 && !ttisnil(&t->array[boundary - 2]))
{
maybesetaboundary(t, boundary - 1);
return boundary - 1;
}
}
else if (boundary + 1 < t->sizearray && !ttisnil(&t->array[boundary]) && ttisnil(&t->array[boundary + 1]))
{
maybesetaboundary(t, boundary + 1);
return boundary + 1;
}
return 0;
}
/*
** Try to find a boundary in table `t'. A `boundary' is an integer index
** such that t[i] is non-nil and t[i+1] is nil (and 0 if t[1] is nil).
*/
int luaH_getn(Table* t)
{
int boundary = getaboundary(t);
if (boundary > 0)
{
if (!ttisnil(&t->array[t->sizearray - 1]) && t->node == dummynode)
return t->sizearray; /* fast-path: the end of the array in `t' already refers to a boundary */
if (boundary < t->sizearray && !ttisnil(&t->array[boundary - 1]) && ttisnil(&t->array[boundary]))
return boundary; /* fast-path: boundary already refers to a boundary in `t' */
int foundboundary = updateaboundary(t, boundary);
if (foundboundary > 0)
return foundboundary;
}
int j = t->sizearray;
if (j > 0 && ttisnil(&t->array[j - 1]))
{
// "branchless" binary search from Array Layouts for Comparison-Based Searching, Paul Khuong, Pat Morin, 2017.
// note that clang is cmov-shy on cmovs around memory operands, so it will compile this to a branchy loop.
TValue* base = t->array;
int rest = j;
while (int half = rest >> 1)
{
base = ttisnil(&base[half]) ? base : base + half;
rest -= half;
}
int boundary = !ttisnil(base) + int(base - t->array);
maybesetaboundary(t, boundary);
return boundary;
}
/* else must find a boundary in hash part */
else if (t->node == dummynode) /* hash part is empty? */
return j; /* that is easy... */
else
return unbound_search(t, j);
}
Table* luaH_clone(lua_State* L, Table* tt)
{
Table* t = luaM_new(L, Table, sizeof(Table), L->activememcat);
luaC_link(L, t, LUA_TTABLE);
t->metatable = tt->metatable;
t->flags = tt->flags;
t->array = NULL;
t->sizearray = 0;
t->lsizenode = 0;
t->nodemask8 = 0;
t->readonly = 0;
t->safeenv = 0;
t->node = cast_to(LuaNode*, dummynode);
t->lastfree = 0;
if (tt->sizearray)
{
t->array = luaM_newarray(L, tt->sizearray, TValue, t->memcat);
maybesetaboundary(t, getaboundary(tt));
t->sizearray = tt->sizearray;
memcpy(t->array, tt->array, t->sizearray * sizeof(TValue));
}
if (tt->node != dummynode)
{
int size = 1 << tt->lsizenode;
t->node = luaM_newarray(L, size, LuaNode, t->memcat);
t->lsizenode = tt->lsizenode;
t->nodemask8 = tt->nodemask8;
memcpy(t->node, tt->node, size * sizeof(LuaNode));
t->lastfree = tt->lastfree;
}
return t;
}
void luaH_clear(Table* tt)
{
/* clear array part */
for (int i = 0; i < tt->sizearray; ++i)
{
setnilvalue(&tt->array[i]);
}
maybesetaboundary(tt, 0);
/* clear hash part */
if (tt->node != dummynode)
{
int size = sizenode(tt);
tt->lastfree = size;
for (int i = 0; i < size; ++i)
{
LuaNode* n = gnode(tt, i);
setnilvalue(gkey(n));
setnilvalue(gval(n));
gnext(n) = 0;
}
}
/* back to empty -> no tag methods present */
tt->flags = cast_byte(~0);
}
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