1997-09-17 03:25:59 +08:00
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/*
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2000-10-05 21:00:17 +08:00
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** $Id: ltm.c,v 1.53 2000/10/05 12:14:08 roberto Exp roberto $
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1997-09-17 03:25:59 +08:00
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** Tag methods
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** See Copyright Notice in lua.h
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*/
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#include <stdio.h>
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#include <string.h>
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2000-06-12 21:52:05 +08:00
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#include "lua.h"
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2000-09-12 03:45:27 +08:00
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#include "ldo.h"
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1997-09-17 03:25:59 +08:00
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#include "lmem.h"
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#include "lobject.h"
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1997-11-20 01:29:23 +08:00
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#include "lstate.h"
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1997-09-17 03:25:59 +08:00
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#include "ltm.h"
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2000-10-05 21:00:17 +08:00
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const char *const luaT_eventname[] = { /* ORDER TM */
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2000-02-23 02:12:46 +08:00
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"gettable", "settable", "index", "getglobal", "setglobal", "add", "sub",
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2000-03-21 03:14:54 +08:00
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"mul", "div", "pow", "unm", "lt", "concat", "gc", "function",
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"le", "gt", "ge", /* deprecated options!! */
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NULL
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1997-09-17 03:25:59 +08:00
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};
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2000-09-12 04:29:27 +08:00
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static int findevent (const char *name) {
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int i;
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for (i=0; luaT_eventname[i]; i++)
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if (strcmp(luaT_eventname[i], name) == 0)
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return i;
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return -1; /* name not found */
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}
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2000-03-28 04:08:02 +08:00
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static int luaI_checkevent (lua_State *L, const char *name, int t) {
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2000-09-12 04:29:27 +08:00
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int e = findevent(name);
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2000-10-05 21:00:17 +08:00
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if (e >= TM_N)
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2000-09-12 04:29:27 +08:00
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luaO_verror(L, "event `%.50s' is deprecated", name);
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2000-10-05 21:00:17 +08:00
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if (e == TM_GC && t == LUA_TTABLE)
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2000-09-12 04:29:27 +08:00
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luaO_verror(L, "event `gc' for tables is deprecated");
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1997-09-17 03:25:59 +08:00
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if (e < 0)
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2000-09-12 04:29:27 +08:00
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luaO_verror(L, "`%.50s' is not a valid event name", name);
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1997-09-17 03:25:59 +08:00
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return e;
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}
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2000-10-05 20:14:08 +08:00
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/* events in LUA_TNIL are all allowed, since this is used as a
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1997-09-17 03:25:59 +08:00
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* 'placeholder' for "default" fallbacks
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*/
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2000-10-05 21:00:17 +08:00
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/* ORDER LUA_T, ORDER TM */
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static const char luaT_validevents[NUM_TAGS][TM_N] = {
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2000-10-05 20:14:08 +08:00
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{1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1}, /* LUA_TUSERDATA */
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{1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, /* LUA_TNIL */
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{1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1}, /* LUA_TNUMBER */
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{1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1}, /* LUA_TSTRING */
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{0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1}, /* LUA_TTABLE */
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{1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0} /* LUA_TFUNCTION */
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1997-09-17 03:25:59 +08:00
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};
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2000-03-31 00:41:51 +08:00
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int luaT_validevent (int t, int e) { /* ORDER LUA_T */
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2000-10-05 20:14:08 +08:00
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return (t >= NUM_TAGS) ? 1 : luaT_validevents[t][e];
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1997-09-17 03:25:59 +08:00
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}
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1999-11-22 21:12:07 +08:00
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static void init_entry (lua_State *L, int tag) {
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1997-09-17 03:25:59 +08:00
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int i;
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2000-10-05 21:00:17 +08:00
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for (i=0; i<TM_N; i++)
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luaT_gettm(L, tag, i) = NULL;
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L->TMtable[tag].collected = NULL;
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1997-09-17 03:25:59 +08:00
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}
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1997-11-04 23:27:53 +08:00
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1999-11-22 21:12:07 +08:00
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void luaT_init (lua_State *L) {
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1997-11-04 23:27:53 +08:00
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int t;
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2000-10-05 21:00:17 +08:00
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luaM_growvector(L, L->TMtable, 0, NUM_TAGS, struct TM, "", MAX_INT);
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L->nblocks += NUM_TAGS*sizeof(struct TM);
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2000-08-05 03:38:35 +08:00
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L->last_tag = NUM_TAGS-1;
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2000-03-21 03:14:54 +08:00
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for (t=0; t<=L->last_tag; t++)
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1999-11-22 21:12:07 +08:00
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init_entry(L, t);
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1997-11-04 23:27:53 +08:00
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}
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1999-11-22 21:12:07 +08:00
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int lua_newtag (lua_State *L) {
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2000-10-05 21:00:17 +08:00
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luaM_growvector(L, L->TMtable, L->last_tag, 1, struct TM,
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2000-05-24 21:54:49 +08:00
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"tag table overflow", MAX_INT);
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2000-10-05 21:00:17 +08:00
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L->nblocks += sizeof(struct TM);
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2000-08-05 03:38:35 +08:00
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L->last_tag++;
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1999-11-22 21:12:07 +08:00
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init_entry(L, L->last_tag);
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1997-11-20 01:29:23 +08:00
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return L->last_tag;
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1997-09-17 03:25:59 +08:00
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}
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1999-11-22 21:12:07 +08:00
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static void checktag (lua_State *L, int tag) {
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2000-03-21 03:14:54 +08:00
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if (!(0 <= tag && tag <= L->last_tag))
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2000-09-12 04:29:27 +08:00
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luaO_verror(L, "%d is not a valid tag", tag);
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1997-09-17 03:25:59 +08:00
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}
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1999-11-22 21:12:07 +08:00
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void luaT_realtag (lua_State *L, int tag) {
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2000-10-05 20:14:08 +08:00
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if (!validtag(tag))
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2000-09-12 04:29:27 +08:00
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luaO_verror(L, "tag %d was not created by `newtag'", tag);
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1997-09-17 03:25:59 +08:00
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}
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1999-11-22 21:12:07 +08:00
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int lua_copytagmethods (lua_State *L, int tagto, int tagfrom) {
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1997-12-12 01:21:11 +08:00
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int e;
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1999-11-22 21:12:07 +08:00
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checktag(L, tagto);
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checktag(L, tagfrom);
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2000-10-05 21:00:17 +08:00
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for (e=0; e<TM_N; e++) {
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1999-01-15 21:11:57 +08:00
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if (luaT_validevent(tagto, e))
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2000-10-05 21:00:17 +08:00
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luaT_gettm(L, tagto, e) = luaT_gettm(L, tagfrom, e);
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1997-12-12 01:21:11 +08:00
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}
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return tagto;
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}
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1997-09-17 03:25:59 +08:00
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2000-10-05 20:14:08 +08:00
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int luaT_tag (const TObject *o) {
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int t = ttype(o);
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2000-03-30 04:19:20 +08:00
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switch (t) {
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2000-10-05 20:14:08 +08:00
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case LUA_TUSERDATA: return tsvalue(o)->u.d.tag;
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case LUA_TTABLE: return hvalue(o)->htag;
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default: return t;
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1997-09-17 03:25:59 +08:00
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}
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}
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2000-09-06 03:33:32 +08:00
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void lua_gettagmethod (lua_State *L, int t, const char *event) {
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2000-02-23 02:12:46 +08:00
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int e;
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2000-03-28 04:08:02 +08:00
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e = luaI_checkevent(L, event, t);
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1999-11-22 21:12:07 +08:00
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checktag(L, t);
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2000-10-05 21:00:17 +08:00
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if (luaT_validevent(t, e) && luaT_gettm(L, t, e)) {
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clvalue(L->top) = luaT_gettm(L, t, e);
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ttype(L->top) = LUA_TFUNCTION;
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}
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1997-09-17 03:25:59 +08:00
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else
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2000-10-05 20:14:08 +08:00
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ttype(L->top) = LUA_TNIL;
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2000-09-12 03:45:27 +08:00
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incr_top;
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1997-09-17 03:25:59 +08:00
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}
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2000-09-06 03:33:32 +08:00
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void lua_settagmethod (lua_State *L, int t, const char *event) {
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2000-10-05 21:00:17 +08:00
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Closure *oldtm;
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int e = luaI_checkevent(L, event, t);
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1999-11-22 21:12:07 +08:00
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checktag(L, t);
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1999-01-15 21:11:57 +08:00
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if (!luaT_validevent(t, e))
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2000-09-12 04:29:27 +08:00
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luaO_verror(L, "cannot change `%.20s' tag method for type `%.20s'%.20s",
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2000-10-05 20:14:08 +08:00
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luaT_eventname[e], luaO_typenames[t],
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2000-10-05 21:00:17 +08:00
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(t == LUA_TTABLE || t == LUA_TUSERDATA) ?
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" with default tag" : "");
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oldtm = luaT_gettm(L, t, e);
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switch (ttype(L->top - 1)) {
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case LUA_TNIL:
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luaT_gettm(L, t, e) = NULL;
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break;
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case LUA_TFUNCTION:
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luaT_gettm(L, t, e) = clvalue(L->top - 1);
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break;
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default:
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lua_error(L, "tag method must be a function (or nil)");
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}
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clvalue(L->top - 1) = oldtm;
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ttype(L->top - 1) = (oldtm ? LUA_TFUNCTION : LUA_TNIL);
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1997-09-17 03:25:59 +08:00
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}
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