/*** $Id: lstring.c,v 2.24 2012/05/11 14:14:42 roberto Exp $** String table (keeps all strings handled by Lua)** See Copyright Notice in lua.h*/ #include <string.h> #define lstring_c#define LUA_CORE #include "lua.h" #include "lmem.h"#include "lobject.h"#include "lstate.h"#include "lstring.h" /*** Lua will use at most ~(2^LUAI_HASHLIMIT) bytes from a string to** compute its hash*/#if !defined(LUAI_HASHLIMIT)#define LUAI_HASHLIMIT 5#endif /*** equality for long strings*/int luaS_eqlngstr (TString *a, TString *b) { size_t len = a->tsv.len; lua_assert(a->tsv.tt == LUA_TLNGSTR && b->tsv.tt == LUA_TLNGSTR); return (a == b) || /* same instance or... */ ((len == b->tsv.len) && /* equal length and ... */ (memcmp(getstr(a), getstr(b), len) == 0)); /* equal contents */} /*** equality for strings*/int luaS_eqstr (TString *a, TString *b) { return (a->tsv.tt == b->tsv.tt) && (a->tsv.tt == LUA_TSHRSTR ? eqshrstr(a, b) : luaS_eqlngstr(a, b));} unsigned int luaS_hash (const char *str, size_t l, unsigned int seed) { unsigned int h = seed ^ l; size_t l1; size_t step = (l >> LUAI_HASHLIMIT) + 1; for (l1 = l; l1 >= step; l1 -= step) h = h ^ ((h<<5) + (h>>2) + cast_byte(str[l1 - 1])); return h;} /*** resizes the string table*/void luaS_resize (lua_State *L, int newsize) { int i; stringtable *tb = &G(L)->strt; /* cannot resize while GC is traversing strings */ luaC_runtilstate(L, ~bitmask(GCSsweepstring)); 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 = gch(p)->next; /* save next */ unsigned int h = lmod(gco2ts(p)->hash, newsize); /* new position */ gch(p)->next = tb->hash[h]; /* chain it */ tb->hash[h] = p; resetoldbit(p); /* see MOVE OLD rule */ p = next; } } if (newsize < tb->size) { /* shrinking slice must be empty */ lua_assert(tb->hash[newsize] == NULL && tb->hash[tb->size - 1] == NULL); luaM_reallocvector(L, tb->hash, tb->size, newsize, GCObject *); } tb->size = newsize;} /*** creates a new string object*/static TString *createstrobj (lua_State *L, const char *str, size_t l, int tag, unsigned int h, GCObject **list) { TString *ts; size_t totalsize; /* total size of TString object */ totalsize = sizeof(TString) + ((l + 1) * sizeof(char)); ts = &luaC_newobj(L, tag, totalsize, list, 0)->ts; ts->tsv.len = l; ts->tsv.hash = h; ts->tsv.extra = 0; memcpy(ts+1, str, l*sizeof(char)); ((char *)(ts+1))[l] = '\0'; /* ending 0 */ return ts;} /*** creates a new short string, inserting it into string table*/static TString *newshrstr (lua_State *L, const char *str, size_t l, unsigned int h) { GCObject **list; /* (pointer to) list where it will be inserted */ stringtable *tb = &G(L)->strt; TString *s; if (tb->nuse >= cast(lu_int32, tb->size) && tb->size <= MAX_INT/2) luaS_resize(L, tb->size*2); /* too crowded */ list = &tb->hash[lmod(h, tb->size)]; s = createstrobj(L, str, l, LUA_TSHRSTR, h, list); tb->nuse++; return s;} /*** checks whether short string exists and reuses it or creates a new one*/static TString *internshrstr (lua_State *L, const char *str, size_t l) { GCObject *o; global_State *g = G(L); unsigned int h = luaS_hash(str, l, g->seed); for (o = g->strt.hash[lmod(h, g->strt.size)]; o != NULL; o = gch(o)->next) { TString *ts = rawgco2ts(o); if (h == ts->tsv.hash && ts->tsv.len == l && (memcmp(str, getstr(ts), l * sizeof(char)) == 0)) { if (isdead(G(L), o)) /* string is dead (but was not collected yet)? */ changewhite(o); /* resurrect it */ return ts; } } return newshrstr(L, str, l, h); /* not found; create a new string */} /*** new string (with explicit length)*/TString *luaS_newlstr (lua_State *L, const char *str, size_t l) { if (l <= LUAI_MAXSHORTLEN) /* short string? */ return internshrstr(L, str, l); else { if (l + 1 > (MAX_SIZET - sizeof(TString))/sizeof(char)) luaM_toobig(L); return createstrobj(L, str, l, LUA_TLNGSTR, G(L)->seed, NULL); }} /*** new zero-terminated string*/TString *luaS_new (lua_State *L, const char *str) { return luaS_newlstr(L, str, strlen(str));} Udata *luaS_newudata (lua_State *L, size_t s, Table *e) { Udata *u; if (s > MAX_SIZET - sizeof(Udata)) luaM_toobig(L); u = &luaC_newobj(L, LUA_TUSERDATA, sizeof(Udata) + s, NULL, 0)->u; u->uv.len = s; u->uv.metatable = NULL; u->uv.env = e; return u;}
/*
** $Id: lstring.c,v 2.24 2012/05/11 14:14:42 roberto Exp $
** String table (keeps all strings handled by Lua)
** See Copyright Notice in lua.h
*/
#include <string.h>
#define lstring_c
#define LUA_CORE
#include "lua.h"
#include "lmem.h"
#include "lobject.h"
#include "lstate.h"
#include "lstring.h"
/*
** Lua will use at most ~(2^LUAI_HASHLIMIT) bytes from a string to
** compute its hash
*/
#if !defined(LUAI_HASHLIMIT)
#define LUAI_HASHLIMIT 5
#endif
/*
** equality for long strings
*/
int luaS_eqlngstr (TString *a, TString *b) {
size_t len = a->tsv.len;
lua_assert(a->tsv.tt == LUA_TLNGSTR && b->tsv.tt == LUA_TLNGSTR);
return (a == b) || /* same instance or... */
((len == b->tsv.len) && /* equal length and ... */
(memcmp(getstr(a), getstr(b), len) == 0)); /* equal contents */
}
/*
** equality for strings
*/
int luaS_eqstr (TString *a, TString *b) {
return (a->tsv.tt == b->tsv.tt) &&
(a->tsv.tt == LUA_TSHRSTR ? eqshrstr(a, b) : luaS_eqlngstr(a, b));
}
unsigned int luaS_hash (const char *str, size_t l, unsigned int seed) {
unsigned int h = seed ^ l;
size_t l1;
size_t step = (l >> LUAI_HASHLIMIT) + 1;
for (l1 = l; l1 >= step; l1 -= step)
h = h ^ ((h<<5) + (h>>2) + cast_byte(str[l1 - 1]));
return h;
}
/*
** resizes the string table
*/
void luaS_resize (lua_State *L, int newsize) {
int i;
stringtable *tb = &G(L)->strt;
/* cannot resize while GC is traversing strings */
luaC_runtilstate(L, ~bitmask(GCSsweepstring));
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 = gch(p)->next; /* save next */
unsigned int h = lmod(gco2ts(p)->hash, newsize); /* new position */
gch(p)->next = tb->hash[h]; /* chain it */
tb->hash[h] = p;
resetoldbit(p); /* see MOVE OLD rule */
p = next;
}
}
if (newsize < tb->size) {
/* shrinking slice must be empty */
lua_assert(tb->hash[newsize] == NULL && tb->hash[tb->size - 1] == NULL);
luaM_reallocvector(L, tb->hash, tb->size, newsize, GCObject *);
}
tb->size = newsize;
}
/*
** creates a new string object
*/
static TString *createstrobj (lua_State *L, const char *str, size_t l,
int tag, unsigned int h, GCObject **list) {
TString *ts;
size_t totalsize; /* total size of TString object */
totalsize = sizeof(TString) + ((l + 1) * sizeof(char));
ts = &luaC_newobj(L, tag, totalsize, list, 0)->ts;
ts->tsv.len = l;
ts->tsv.hash = h;
ts->tsv.extra = 0;
memcpy(ts+1, str, l*sizeof(char));
((char *)(ts+1))[l] = '\0'; /* ending 0 */
return ts;
}
/*
** creates a new short string, inserting it into string table
*/
static TString *newshrstr (lua_State *L, const char *str, size_t l,
unsigned int h) {
GCObject **list; /* (pointer to) list where it will be inserted */
stringtable *tb = &G(L)->strt;
TString *s;
if (tb->nuse >= cast(lu_int32, tb->size) && tb->size <= MAX_INT/2)
luaS_resize(L, tb->size*2); /* too crowded */
list = &tb->hash[lmod(h, tb->size)];
s = createstrobj(L, str, l, LUA_TSHRSTR, h, list);
tb->nuse++;
return s;
}
/*
** checks whether short string exists and reuses it or creates a new one
*/
static TString *internshrstr (lua_State *L, const char *str, size_t l) {
GCObject *o;
global_State *g = G(L);
unsigned int h = luaS_hash(str, l, g->seed);
for (o = g->strt.hash[lmod(h, g->strt.size)];
o != NULL;
o = gch(o)->next) {
TString *ts = rawgco2ts(o);
if (h == ts->tsv.hash &&
ts->tsv.len == l &&
(memcmp(str, getstr(ts), l * sizeof(char)) == 0)) {
if (isdead(G(L), o)) /* string is dead (but was not collected yet)? */
changewhite(o); /* resurrect it */
return ts;
}
}
return newshrstr(L, str, l, h); /* not found; create a new string */
}
/*
** new string (with explicit length)
*/
TString *luaS_newlstr (lua_State *L, const char *str, size_t l) {
if (l <= LUAI_MAXSHORTLEN) /* short string? */
return internshrstr(L, str, l);
else {
if (l + 1 > (MAX_SIZET - sizeof(TString))/sizeof(char))
luaM_toobig(L);
return createstrobj(L, str, l, LUA_TLNGSTR, G(L)->seed, NULL);
}
}
/*
** new zero-terminated string
*/
TString *luaS_new (lua_State *L, const char *str) {
return luaS_newlstr(L, str, strlen(str));
}
Udata *luaS_newudata (lua_State *L, size_t s, Table *e) {
Udata *u;
if (s > MAX_SIZET - sizeof(Udata))
luaM_toobig(L);
u = &luaC_newobj(L, LUA_TUSERDATA, sizeof(Udata) + s, NULL, 0)->u;
u->uv.len = s;
u->uv.metatable = NULL;
u->uv.env = e;
return u;
}