mirror of https://github.com/rusefi/lua.git
368 lines
8.4 KiB
C
368 lines
8.4 KiB
C
/*
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** fallback.c
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** TecCGraf - PUC-Rio
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*/
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char *rcs_fallback="$Id: fallback.c,v 2.7 1997/06/16 18:43:19 roberto Exp roberto $";
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#include <stdio.h>
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#include <string.h>
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#include "auxlib.h"
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#include "luamem.h"
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#include "fallback.h"
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#include "opcode.h"
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#include "lua.h"
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#include "table.h"
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#include "tree.h"
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#include "hash.h"
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/* -------------------------------------------
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** Reference routines
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*/
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static struct ref {
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TObject o;
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enum {LOCK, HOLD, FREE, COLLECTED} status;
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} *refArray = NULL;
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static int refSize = 0;
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int luaI_ref (TObject *object, int lock)
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{
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int i;
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int oldSize;
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if (ttype(object) == LUA_T_NIL)
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return -1; /* special ref for nil */
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for (i=0; i<refSize; i++)
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if (refArray[i].status == FREE)
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goto found;
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/* no more empty spaces */
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oldSize = refSize;
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refSize = growvector(&refArray, refSize, struct ref, refEM, MAX_WORD);
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for (i=oldSize; i<refSize; i++)
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refArray[i].status = FREE;
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i = oldSize;
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found:
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refArray[i].o = *object;
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refArray[i].status = lock ? LOCK : HOLD;
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return i;
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}
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void lua_unref (int ref)
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{
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if (ref >= 0 && ref < refSize)
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refArray[ref].status = FREE;
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}
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TObject *luaI_getref (int ref)
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{
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static TObject nul = {LUA_T_NIL, {0}};
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if (ref == -1)
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return &nul;
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if (ref >= 0 && ref < refSize &&
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(refArray[ref].status == LOCK || refArray[ref].status == HOLD))
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return &refArray[ref].o;
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else
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return NULL;
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}
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void luaI_travlock (int (*fn)(TObject *))
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{
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int i;
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for (i=0; i<refSize; i++)
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if (refArray[i].status == LOCK)
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fn(&refArray[i].o);
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}
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void luaI_invalidaterefs (void)
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{
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int i;
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for (i=0; i<refSize; i++)
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if (refArray[i].status == HOLD && !luaI_ismarked(&refArray[i].o))
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refArray[i].status = COLLECTED;
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}
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/* -------------------------------------------
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* Internal Methods
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*/
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char *luaI_eventname[] = { /* ORDER IM */
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"gettable", "settable", "index", "getglobal", "setglobal", "add",
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"sub", "mul", "div", "pow", "unm", "lt", "le", "gt", "ge",
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"concat", "gc", "function",
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NULL
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};
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static int luaI_checkevent (char *name, char *list[])
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{
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int e = luaI_findstring(name, list);
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if (e < 0)
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luaL_verror("`%s' is not a valid event name", name);
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return e;
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}
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struct IM *luaI_IMtable = NULL;
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static int IMtable_size = 0;
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static int last_tag = LUA_T_NIL; /* ORDER LUA_T */
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/* events in LUA_T_LINE are all allowed, since this is used as a
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* 'placeholder' for "default" fallbacks
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*/
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static char validevents[NUM_TYPES][IM_N] = { /* ORDER LUA_T, ORDER IM */
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{1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1}, /* LUA_T_USERDATA */
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{1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, /* LUA_T_LINE */
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{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, /* LUA_T_CMARK */
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{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, /* LUA_T_MARK */
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{1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0}, /* LUA_T_CFUNCTION */
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{1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0}, /* LUA_T_FUNCTION */
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{0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, /* LUA_T_ARRAY */
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{1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1}, /* LUA_T_STRING */
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{1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1}, /* LUA_T_NUMBER */
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{1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1} /* LUA_T_NIL */
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};
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static int validevent (lua_Type t, int e)
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{ /* ORDER LUA_T */
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return (t < LUA_T_NIL) ? 1 : validevents[-t][e];
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}
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static void init_entry (int tag)
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{
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int i;
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for (i=0; i<IM_N; i++)
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ttype(luaI_getim(tag, i)) = LUA_T_NIL;
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}
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void luaI_initfallbacks (void)
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{
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if (luaI_IMtable == NULL) {
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int i;
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IMtable_size = NUM_TYPES+10;
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luaI_IMtable = newvector(IMtable_size, struct IM);
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for (i=LUA_T_NIL; i<=LUA_T_USERDATA; i++)
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init_entry(i);
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}
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}
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int lua_newtag (void)
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{
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--last_tag;
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if ((-last_tag) >= IMtable_size) {
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luaI_initfallbacks();
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IMtable_size = growvector(&luaI_IMtable, IMtable_size,
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struct IM, memEM, MAX_INT);
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}
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init_entry(last_tag);
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return last_tag;
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}
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static void checktag (int tag)
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{
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if (!(last_tag <= tag && tag <= 0))
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luaL_verror("%d is not a valid tag", tag);
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}
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void luaI_realtag (int tag)
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{
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if (!(last_tag <= tag && tag < LUA_T_NIL))
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luaL_verror("tag %d is not result of `newtag'", tag);
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}
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void luaI_settag (int tag, TObject *o)
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{
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luaI_realtag(tag);
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switch (ttype(o)) {
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case LUA_T_ARRAY:
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o->value.a->htag = tag;
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break;
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case LUA_T_USERDATA:
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o->value.ts->tag = tag;
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break;
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default:
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luaL_verror("cannot change the tag of a %s", luaI_typenames[-ttype(o)]);
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}
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}
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int luaI_efectivetag (TObject *o)
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{
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lua_Type t = ttype(o);
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if (t == LUA_T_USERDATA) {
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int tag = o->value.ts->tag;
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return (tag >= 0) ? LUA_T_USERDATA : tag;
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}
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else if (t == LUA_T_ARRAY)
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return o->value.a->htag;
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else return t;
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}
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void luaI_gettagmethod (void)
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{
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int t = (int)luaL_check_number(1);
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int e = luaI_checkevent(luaL_check_string(2), luaI_eventname);
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checktag(t);
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if (validevent(t, e))
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luaI_pushobject(luaI_getim(t,e));
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}
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void luaI_settagmethod (void)
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{
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int t = (int)luaL_check_number(1);
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int e = luaI_checkevent(luaL_check_string(2), luaI_eventname);
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lua_Object func = lua_getparam(3);
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checktag(t);
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if (!validevent(t, e))
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luaL_verror("cannot change internal method `%s' for tag %d",
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luaI_eventname[e], t);
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luaL_arg_check(lua_isnil(func) || lua_isfunction(func),
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3, "function expected");
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luaI_pushobject(luaI_getim(t,e));
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*luaI_getim(t, e) = *luaI_Address(func);
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}
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static void stderrorim (void)
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{
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lua_Object s = lua_getparam(1);
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if (lua_isstring(s))
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fprintf(stderr, "lua: %s\n", lua_getstring(s));
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}
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static TObject errorim = {LUA_T_CFUNCTION, {stderrorim}};
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TObject *luaI_geterrorim (void)
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{
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return &errorim;
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}
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void luaI_seterrormethod (void)
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{
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lua_Object func = lua_getparam(1);
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luaL_arg_check(lua_isnil(func) || lua_isfunction(func),
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1, "function expected");
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luaI_pushobject(&errorim);
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errorim = *luaI_Address(func);
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}
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char *luaI_travfallbacks (int (*fn)(TObject *))
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{
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int e;
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if (fn(&errorim))
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return "error";
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for (e=IM_GETTABLE; e<=IM_FUNCTION; e++) { /* ORDER IM */
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int t;
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for (t=0; t>=last_tag; t--)
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if (fn(luaI_getim(t,e)))
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return luaI_eventname[e];
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}
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return NULL;
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}
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/*
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* ===================================================================
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* compatibility with old fallback system
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*/
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static void errorFB (void)
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{
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lua_Object o = lua_getparam(1);
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if (lua_isstring(o))
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fprintf (stderr, "lua: %s\n", lua_getstring(o));
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else
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fprintf(stderr, "lua: unknown error\n");
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}
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static void nilFB (void) { }
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static void typeFB (void)
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{
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lua_error("unexpected type");
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}
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static void fillvalids (IMS e, TObject *func)
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{
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int t;
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for (t=LUA_T_NIL; t<=LUA_T_USERDATA; t++)
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if (validevent(t, e))
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*luaI_getim(t, e) = *func;
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}
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void luaI_setfallback (void)
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{
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static char *oldnames [] = {"error", "getglobal", "arith", "order", NULL};
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TObject oldfunc;
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lua_CFunction replace;
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char *name = luaL_check_string(1);
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lua_Object func = lua_getparam(2);
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luaI_initfallbacks();
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luaL_arg_check(lua_isfunction(func), 2, "function expected");
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switch (luaI_findstring(name, oldnames)) {
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case 0: /* old error fallback */
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oldfunc = errorim;
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errorim = *luaI_Address(func);
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replace = errorFB;
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break;
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case 1: /* old getglobal fallback */
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oldfunc = *luaI_getim(LUA_T_NIL, IM_GETGLOBAL);
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*luaI_getim(LUA_T_NIL, IM_GETGLOBAL) = *luaI_Address(func);
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replace = nilFB;
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break;
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case 2: { /* old arith fallback */
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int i;
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oldfunc = *luaI_getim(LUA_T_NUMBER, IM_POW);
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for (i=IM_ADD; i<=IM_UNM; i++) /* ORDER IM */
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fillvalids(i, luaI_Address(func));
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replace = typeFB;
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break;
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}
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case 3: { /* old order fallback */
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int i;
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oldfunc = *luaI_getim(LUA_T_LINE, IM_LT);
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for (i=IM_LT; i<=IM_GE; i++) /* ORDER IM */
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fillvalids(i, luaI_Address(func));
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replace = typeFB;
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break;
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}
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default: {
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int e;
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if ((e = luaI_findstring(name, luaI_eventname)) >= 0) {
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oldfunc = *luaI_getim(LUA_T_LINE, e);
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fillvalids(e, luaI_Address(func));
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replace = (e == IM_GC || e == IM_INDEX) ? nilFB : typeFB;
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}
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else {
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luaL_verror("`%s' is not a valid fallback name", name);
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replace = NULL; /* to avoid warnings */
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}
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}
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}
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if (oldfunc.ttype != LUA_T_NIL)
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luaI_pushobject(&oldfunc);
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else
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lua_pushcfunction(replace);
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}
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