diff options
Diffstat (limited to 'src/fallback.c')
| -rw-r--r-- | src/fallback.c | 368 |
1 files changed, 0 insertions, 368 deletions
diff --git a/src/fallback.c b/src/fallback.c deleted file mode 100644 index 5a0b5a5b..00000000 --- a/src/fallback.c +++ /dev/null @@ -1,368 +0,0 @@ -/* -** fallback.c -** TecCGraf - PUC-Rio -*/ - -char *rcs_fallback="$Id: fallback.c,v 2.9 1997/06/23 18:27:53 roberto Exp $"; - -#include <stdio.h> -#include <string.h> - -#include "auxlib.h" -#include "luamem.h" -#include "fallback.h" -#include "opcode.h" -#include "lua.h" -#include "table.h" -#include "tree.h" -#include "hash.h" - - - -/* ------------------------------------------- -** Reference routines -*/ - -static struct ref { - TObject o; - enum {LOCK, HOLD, FREE, COLLECTED} status; -} *refArray = NULL; -static int refSize = 0; - -int luaI_ref (TObject *object, int lock) -{ - int i; - int oldSize; - if (ttype(object) == LUA_T_NIL) - return -1; /* special ref for nil */ - for (i=0; i<refSize; i++) - if (refArray[i].status == FREE) - goto found; - /* no more empty spaces */ - oldSize = refSize; - refSize = growvector(&refArray, refSize, struct ref, refEM, MAX_WORD); - for (i=oldSize; i<refSize; i++) - refArray[i].status = FREE; - i = oldSize; - found: - refArray[i].o = *object; - refArray[i].status = lock ? LOCK : HOLD; - return i; -} - - -void lua_unref (int ref) -{ - if (ref >= 0 && ref < refSize) - refArray[ref].status = FREE; -} - - -TObject *luaI_getref (int ref) -{ - static TObject nul = {LUA_T_NIL, {0}}; - if (ref == -1) - return &nul; - if (ref >= 0 && ref < refSize && - (refArray[ref].status == LOCK || refArray[ref].status == HOLD)) - return &refArray[ref].o; - else - return NULL; -} - - -void luaI_travlock (int (*fn)(TObject *)) -{ - int i; - for (i=0; i<refSize; i++) - if (refArray[i].status == LOCK) - fn(&refArray[i].o); -} - - -void luaI_invalidaterefs (void) -{ - int i; - for (i=0; i<refSize; i++) - if (refArray[i].status == HOLD && !luaI_ismarked(&refArray[i].o)) - refArray[i].status = COLLECTED; -} - - -/* ------------------------------------------- -* Internal Methods -*/ - -char *luaI_eventname[] = { /* ORDER IM */ - "gettable", "settable", "index", "getglobal", "setglobal", "add", - "sub", "mul", "div", "pow", "unm", "lt", "le", "gt", "ge", - "concat", "gc", "function", - NULL -}; - - - -static int luaI_checkevent (char *name, char *list[]) -{ - int e = luaI_findstring(name, list); - if (e < 0) - luaL_verror("`%s' is not a valid event name", name); - return e; -} - - -struct IM *luaI_IMtable = NULL; - -static int IMtable_size = 0; -static int last_tag = LUA_T_NIL; /* ORDER LUA_T */ - - -/* events in LUA_T_LINE are all allowed, since this is used as a -* 'placeholder' for "default" fallbacks -*/ -static char validevents[NUM_TYPES][IM_N] = { /* ORDER LUA_T, ORDER IM */ -{1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1}, /* LUA_T_USERDATA */ -{1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, /* LUA_T_LINE */ -{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, /* LUA_T_CMARK */ -{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, /* LUA_T_MARK */ -{1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0}, /* LUA_T_CFUNCTION */ -{1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0}, /* LUA_T_FUNCTION */ -{0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, /* LUA_T_ARRAY */ -{1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1}, /* LUA_T_STRING */ -{1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1}, /* LUA_T_NUMBER */ -{1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1} /* LUA_T_NIL */ -}; - -static int validevent (lua_Type t, int e) -{ /* ORDER LUA_T */ - return (t < LUA_T_NIL) ? 1 : validevents[-t][e]; -} - - -static void init_entry (int tag) -{ - int i; - for (i=0; i<IM_N; i++) - ttype(luaI_getim(tag, i)) = LUA_T_NIL; -} - -void luaI_initfallbacks (void) -{ - if (luaI_IMtable == NULL) { - int i; - IMtable_size = NUM_TYPES+10; - luaI_IMtable = newvector(IMtable_size, struct IM); - for (i=LUA_T_NIL; i<=LUA_T_USERDATA; i++) - init_entry(i); - } -} - -int lua_newtag (void) -{ - --last_tag; - if ((-last_tag) >= IMtable_size) { - luaI_initfallbacks(); - IMtable_size = growvector(&luaI_IMtable, IMtable_size, - struct IM, memEM, MAX_INT); - } - init_entry(last_tag); - return last_tag; -} - - -static void checktag (int tag) -{ - if (!(last_tag <= tag && tag <= 0)) - luaL_verror("%d is not a valid tag", tag); -} - -void luaI_realtag (int tag) -{ - if (!(last_tag <= tag && tag < LUA_T_NIL)) - luaL_verror("tag %d is not result of `newtag'", tag); -} - - -void luaI_settag (int tag, TObject *o) -{ - luaI_realtag(tag); - switch (ttype(o)) { - case LUA_T_ARRAY: - o->value.a->htag = tag; - break; - case LUA_T_USERDATA: - o->value.ts->tag = tag; - break; - default: - luaL_verror("cannot change the tag of a %s", luaI_typenames[-ttype(o)]); - } -} - - -int luaI_efectivetag (TObject *o) -{ - lua_Type t = ttype(o); - if (t == LUA_T_USERDATA) { - int tag = o->value.ts->tag; - return (tag >= 0) ? LUA_T_USERDATA : tag; - } - else if (t == LUA_T_ARRAY) - return o->value.a->htag; - else return t; -} - - -void luaI_gettagmethod (void) -{ - int t = (int)luaL_check_number(1); - int e = luaI_checkevent(luaL_check_string(2), luaI_eventname); - checktag(t); - if (validevent(t, e)) - luaI_pushobject(luaI_getim(t,e)); -} - - -void luaI_settagmethod (void) -{ - int t = (int)luaL_check_number(1); - int e = luaI_checkevent(luaL_check_string(2), luaI_eventname); - lua_Object func = lua_getparam(3); - checktag(t); - if (!validevent(t, e)) - luaL_verror("cannot change internal method `%s' for tag %d", - luaI_eventname[e], t); - luaL_arg_check(lua_isnil(func) || lua_isfunction(func), - 3, "function expected"); - luaI_pushobject(luaI_getim(t,e)); - *luaI_getim(t, e) = *luaI_Address(func); -} - - -static void stderrorim (void) -{ - lua_Object s = lua_getparam(1); - if (lua_isstring(s)) - fprintf(stderr, "lua: %s\n", lua_getstring(s)); -} - -static TObject errorim = {LUA_T_CFUNCTION, {stderrorim}}; - - -TObject *luaI_geterrorim (void) -{ - return &errorim; -} - -void luaI_seterrormethod (void) -{ - lua_Object func = lua_getparam(1); - luaL_arg_check(lua_isnil(func) || lua_isfunction(func), - 1, "function expected"); - luaI_pushobject(&errorim); - errorim = *luaI_Address(func); -} - -char *luaI_travfallbacks (int (*fn)(TObject *)) -{ - int e; - if (fn(&errorim)) - return "error"; - for (e=IM_GETTABLE; e<=IM_FUNCTION; e++) { /* ORDER IM */ - int t; - for (t=0; t>=last_tag; t--) - if (fn(luaI_getim(t,e))) - return luaI_eventname[e]; - } - return NULL; -} - - -/* -* =================================================================== -* compatibility with old fallback system -*/ -#if LUA_COMPAT2_5 - -static void errorFB (void) -{ - lua_Object o = lua_getparam(1); - if (lua_isstring(o)) - fprintf (stderr, "lua: %s\n", lua_getstring(o)); - else - fprintf(stderr, "lua: unknown error\n"); -} - - -static void nilFB (void) { } - - -static void typeFB (void) -{ - lua_error("unexpected type"); -} - - -static void fillvalids (IMS e, TObject *func) -{ - int t; - for (t=LUA_T_NIL; t<=LUA_T_USERDATA; t++) - if (validevent(t, e)) - *luaI_getim(t, e) = *func; -} - - -void luaI_setfallback (void) -{ - static char *oldnames [] = {"error", "getglobal", "arith", "order", NULL}; - TObject oldfunc; - lua_CFunction replace; - char *name = luaL_check_string(1); - lua_Object func = lua_getparam(2); - luaI_initfallbacks(); - luaL_arg_check(lua_isfunction(func), 2, "function expected"); - switch (luaI_findstring(name, oldnames)) { - case 0: /* old error fallback */ - oldfunc = errorim; - errorim = *luaI_Address(func); - replace = errorFB; - break; - case 1: /* old getglobal fallback */ - oldfunc = *luaI_getim(LUA_T_NIL, IM_GETGLOBAL); - *luaI_getim(LUA_T_NIL, IM_GETGLOBAL) = *luaI_Address(func); - replace = nilFB; - break; - case 2: { /* old arith fallback */ - int i; - oldfunc = *luaI_getim(LUA_T_NUMBER, IM_POW); - for (i=IM_ADD; i<=IM_UNM; i++) /* ORDER IM */ - fillvalids(i, luaI_Address(func)); - replace = typeFB; - break; - } - case 3: { /* old order fallback */ - int i; - oldfunc = *luaI_getim(LUA_T_LINE, IM_LT); - for (i=IM_LT; i<=IM_GE; i++) /* ORDER IM */ - fillvalids(i, luaI_Address(func)); - replace = typeFB; - break; - } - default: { - int e; - if ((e = luaI_findstring(name, luaI_eventname)) >= 0) { - oldfunc = *luaI_getim(LUA_T_LINE, e); - fillvalids(e, luaI_Address(func)); - replace = (e == IM_GC || e == IM_INDEX) ? nilFB : typeFB; - } - else { - luaL_verror("`%s' is not a valid fallback name", name); - replace = NULL; /* to avoid warnings */ - } - } - } - if (oldfunc.ttype != LUA_T_NIL) - luaI_pushobject(&oldfunc); - else - lua_pushcfunction(replace); -} -#endif |