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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134/*** String table (keeps all strings handled by Lua)** See Copyright Notice in lua.h** luaS_newllocstr is adapted from "elua -- pseudo RO strings"** by bogdanm, distributed under a MIT license.*/
#include <string.h>
#define lstring_c#define LUA_CORE
#include "lua.h"
#include "lmem.h"#include "lobject.h"#include "lstate.h"#include "lstring.h"
void luaS_resize (lua_State *L, int newsize) { stringtable *tb; int i; tb = &G(L)->strt; if (luaC_sweepstrgc(L) || newsize == tb->size || is_resizing_strings_gc(L)) return; /* cannot resize during GC traverse or doesn't need to be resized */ set_resizing_strings_gc(L); if (newsize > tb->size) { luaM_reallocvector(L, tb->hash, tb->size, newsize, GCObject *); for (i=tb->size; i<newsize; i++) tb->hash[i] = NULL; } /* rehash */ for (i=0; i<tb->size; i++) { GCObject *p = tb->hash[i]; tb->hash[i] = NULL; while (p) { /* for each node in the list */ GCObject *next = p->gch.next; /* save next */ unsigned int h = gco2ts(p)->hash; int h1 = lmod(h, newsize); /* new position */ lua_assert(cast_int(h%newsize) == lmod(h, newsize)); p->gch.next = tb->hash[h1]; /* chain it */ tb->hash[h1] = p; p = next; } } if (newsize < tb->size) luaM_reallocvector(L, tb->hash, tb->size, newsize, GCObject *); tb->size = newsize; unset_resizing_strings_gc(L);}
static TString *newlstr (lua_State *L, const char *str, size_t l, unsigned int h, char type) { TString *ts; stringtable *tb; if (l > ((MAX_SIZET - sizeof(TString))/sizeof(char)) - sizeof("")) luaM_toobig(L); tb = &G(L)->strt; if ((tb->nuse + 1) > cast(lu_int32, tb->size) && tb->size <= MAX_INT/2) luaS_resize(L, tb->size*2); /* too crowded */ ts = cast(TString *, luaM_malloc(L, sizetstring(type, l))); ts->tsv.len = l; ts->tsv.hash = h; ts->tsv.marked = luaC_white(G(L)); if (testbits(type, TSTR_FIXED)) luaS_fix(ts); ts->tsv.tt = LUA_TSTRING; ts->tsv.reserved = 0; ts->tsv.type = cast_byte(type); if (testbits(type, TSTR_INBIN)) /* ROCKLUA ADDED */ *(const char **)(ts+1) = str; /* store a pointer to the string instead */ else { memcpy(ts+1, str, l*sizeof(char)); ((char *)(ts+1))[l] = '\0'; /* ending 0 */ } h = lmod(h, tb->size); ts->tsv.next = tb->hash[h]; /* chain new entry */ tb->hash[h] = obj2gco(ts); tb->nuse++; return ts;}
TString *luaS_newllocstr (lua_State *L, const char *str, size_t l, char type) { GCObject *o; if (testbits(type, TSTR_CHKSZ)) l = strlen(str);#ifdef INBINARYSTRINGS else if (!testbits(type, TSTR_ISLIT))#else if (true)#endif resetbits(type, TSTR_INBIN); /* only whole strings can be used inbin */ unsigned int h = cast(unsigned int, l); /* seed */ size_t step = (l>>5)+1; /* if string is too long, don't hash all its chars */ size_t l1; for (l1=l; l1>=step; l1-=step) /* compute hash */ h = h ^ ((h<<5)+(h>>2)+cast(unsigned char, str[l1-1])); for (o = G(L)->strt.hash[lmod(h, G(L)->strt.size)]; o != NULL; o = o->gch.next) { TString *ts = rawgco2ts(o); if (ts->tsv.len == l && (memcmp(str, getstr(ts), l) == 0)) { /* string may be dead */ if (isdead(G(L), o)) changewhite(o); if (testbits(type, TSTR_FIXED)) luaS_fix(ts); return ts; } } return newlstr(L, str, l, h, type); /* not found */}
Udata *luaS_newudata (lua_State *L, size_t s, Table *e) { Udata *u; if (s > MAX_SIZET - sizeof(Udata)) luaM_toobig(L); u = cast(Udata *, luaM_malloc(L, s + sizeof(Udata))); u->uv.marked = luaC_white(G(L)); /* is not finalized */ u->uv.tt = LUA_TUSERDATA; u->uv.len = s; u->uv.metatable = NULL; u->uv.env = e; /* chain it on udata list (after main thread) */ u->uv.next = G(L)->mainthread->next; G(L)->mainthread->next = obj2gco(u); return u;}