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1 /*
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2 ** $Id: lstring.c,v 2.8.1.1 2007/12/27 13:02:25 roberto Exp $
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3 ** String table (keeps all strings handled by Lua)
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4 ** See Copyright Notice in lua.h
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5 */
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6
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7
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8 #include <string.h>
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9
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10 #define lstring_c
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11 #define LUA_CORE
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12
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13 #include "lua.h"
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14
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15 #include "lmem.h"
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16 #include "lobject.h"
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17 #include "lstate.h"
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18 #include "lstring.h"
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19
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20
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21
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22 void luaS_resize (lua_State *L, int newsize) {
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23 GCObject **newhash;
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24 stringtable *tb;
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25 int i;
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26 if (G(L)->gcstate == GCSsweepstring)
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27 return; /* cannot resize during GC traverse */
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28 newhash = luaM_newvector(L, newsize, GCObject *);
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29 tb = &G(L)->strt;
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30 for (i=0; i<newsize; i++) newhash[i] = NULL;
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31 /* rehash */
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32 for (i=0; i<tb->size; i++) {
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33 GCObject *p = tb->hash[i];
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34 while (p) { /* for each node in the list */
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35 GCObject *next = p->gch.next; /* save next */
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36 unsigned int h = gco2ts(p)->hash;
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37 int h1 = lmod(h, newsize); /* new position */
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38 lua_assert(cast_int(h%newsize) == lmod(h, newsize));
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39 p->gch.next = newhash[h1]; /* chain it */
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40 newhash[h1] = p;
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41 p = next;
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42 }
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43 }
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44 luaM_freearray(L, tb->hash, tb->size, TString *);
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45 tb->size = newsize;
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46 tb->hash = newhash;
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47 }
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48
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49
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50 static TString *newlstr (lua_State *L, const char *str, size_t l,
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51 unsigned int h) {
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52 TString *ts;
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53 stringtable *tb;
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54 if (l+1 > (MAX_SIZET - sizeof(TString))/sizeof(char))
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55 luaM_toobig(L);
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56 ts = cast(TString *, luaM_malloc(L, (l+1)*sizeof(char)+sizeof(TString)));
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57 ts->tsv.len = l;
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58 ts->tsv.hash = h;
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59 ts->tsv.marked = luaC_white(G(L));
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60 ts->tsv.tt = LUA_TSTRING;
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61 ts->tsv.reserved = 0;
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62 memcpy(ts+1, str, l*sizeof(char));
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63 ((char *)(ts+1))[l] = '\0'; /* ending 0 */
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64 tb = &G(L)->strt;
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65 h = lmod(h, tb->size);
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66 ts->tsv.next = tb->hash[h]; /* chain new entry */
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67 tb->hash[h] = obj2gco(ts);
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68 tb->nuse++;
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69 if (tb->nuse > cast(lu_int32, tb->size) && tb->size <= MAX_INT/2)
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70 luaS_resize(L, tb->size*2); /* too crowded */
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71 return ts;
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72 }
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73
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74
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75 TString *luaS_newlstr (lua_State *L, const char *str, size_t l) {
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76 GCObject *o;
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77 unsigned int h = cast(unsigned int, l); /* seed */
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78 size_t step = (l>>5)+1; /* if string is too long, don't hash all its chars */
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79 size_t l1;
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80 for (l1=l; l1>=step; l1-=step) /* compute hash */
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81 h = h ^ ((h<<5)+(h>>2)+cast(unsigned char, str[l1-1]));
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82 for (o = G(L)->strt.hash[lmod(h, G(L)->strt.size)];
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83 o != NULL;
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84 o = o->gch.next) {
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85 TString *ts = rawgco2ts(o);
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86 if (ts->tsv.len == l && (memcmp(str, getstr(ts), l) == 0)) {
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87 /* string may be dead */
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88 if (isdead(G(L), o)) changewhite(o);
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89 return ts;
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90 }
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91 }
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92 return newlstr(L, str, l, h); /* not found */
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93 }
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94
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95
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96 Udata *luaS_newudata (lua_State *L, size_t s, Table *e) {
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97 Udata *u;
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98 if (s > MAX_SIZET - sizeof(Udata))
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99 luaM_toobig(L);
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100 u = cast(Udata *, luaM_malloc(L, s + sizeof(Udata)));
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101 u->uv.marked = luaC_white(G(L)); /* is not finalized */
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102 u->uv.tt = LUA_TUSERDATA;
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103 u->uv.len = s;
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104 u->uv.metatable = NULL;
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105 u->uv.env = e;
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106 /* chain it on udata list (after main thread) */
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107 u->uv.next = G(L)->mainthread->next;
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108 G(L)->mainthread->next = obj2gco(u);
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109 return u;
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110 }
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111
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