/* Handle ctype __index/__newindex metamethods. */
static int ffi_index_meta(lua_State *L, CTState *cts, CType *ct, MMS mm)
{
CTypeID id = ctype_typeid(cts, ct);
cTValue *tv = lj_ctype_meta(cts, id, mm);
TValue *base = L->base;
if (!tv) {
const char *s;
err_index:
s = strdata(lj_ctype_repr(L, id, NULL));
if (tvisstr(L->base+1))
lj_err_callerv(L, LJ_ERR_FFI_BADMEMBER, s, strVdata(L->base+1));
else
lj_err_callerv(L, LJ_ERR_FFI_BADIDX, s);
}
if (!tvisfunc(tv)) {
if (mm == MM_index) {
cTValue *o = lj_meta_tget(L, tv, base+1);
if (o) {
if (tvisnil(o)) goto err_index;
copyTV(L, L->top-1, o);
return 1;
}
} else {
TValue *o = lj_meta_tset(L, tv, base+1);
if (o) {
copyTV(L, o, base+2);
return 0;
}
}
tv = L->top-1;
}
return lj_meta_tailcall(L, tv);
}
static int lj_cf_package_module(lua_State *L)
{
const char *modname = luaL_checkstring(L, 1);
int loaded = lua_gettop(L) + 1; /* index of _LOADED table */
lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
lua_getfield(L, loaded, modname); /* get _LOADED[modname] */
if (!lua_istable(L, -1)) { /* not found? */
lua_pop(L, 1); /* remove previous result */
/* try global variable (and create one if it does not exist) */
if (luaL_findtable(L, LUA_GLOBALSINDEX, modname, 1) != NULL)
lj_err_callerv(L, LJ_ERR_BADMODN, modname);
lua_pushvalue(L, -1);
lua_setfield(L, loaded, modname); /* _LOADED[modname] = new table */
}
/* check whether table already has a _NAME field */
lua_getfield(L, -1, "_NAME");
if (!lua_isnil(L, -1)) { /* is table an initialized module? */
lua_pop(L, 1);
} else { /* no; initialize it */
lua_pop(L, 1);
modinit(L, modname);
}
lua_pushvalue(L, -1);
setfenv(L);
dooptions(L, loaded - 1);
return 0;
}
LUALIB_API void luaL_openlib(lua_State *L, const char *libname,
const luaL_Reg *l, int nup)
{
lj_lib_checkfpu(L);
if (libname) {
int size = libsize(l);
/* check whether lib already exists */
luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 16);
lua_getfield(L, -1, libname); /* get _LOADED[libname] */
if (!lua_istable(L, -1)) { /* not found? */
lua_pop(L, 1); /* remove previous result */
/* try global variable (and create one if it does not exist) */
if (luaL_findtable(L, LUA_GLOBALSINDEX, libname, size) != NULL)
lj_err_callerv(L, LJ_ERR_BADMODN, libname);
lua_pushvalue(L, -1);
lua_setfield(L, -3, libname); /* _LOADED[libname] = new table */
}
lua_remove(L, -2); /* remove _LOADED table */
lua_insert(L, -(nup+1)); /* move library table to below upvalues */
}
for (; l->name; l++) {
int i;
for (i = 0; i < nup; i++) /* copy upvalues to the top */
lua_pushvalue(L, -nup);
lua_pushcclosure(L, l->func, nup);
lua_setfield(L, -(nup+2), l->name);
}
lua_pop(L, nup); /* remove upvalues */
}
/* Bad conversion from TValue. */
LJ_NORET static void cconv_err_convtv(CTState *cts, CType *d, TValue *o,
CTInfo flags)
{
const char *dst = strdata(lj_ctype_repr(cts->L, ctype_typeid(cts, d), NULL));
const char *src = lj_typename(o);
if (CCF_GETARG(flags))
lj_err_argv(cts->L, CCF_GETARG(flags), LJ_ERR_FFI_BADCONV, src, dst);
else
lj_err_callerv(cts->L, LJ_ERR_FFI_BADCONV, src, dst);
}
static int getfield(lua_State *L, const char *key, int d)
{
int res;
lua_getfield(L, -1, key);
if (lua_isnumber(L, -1)) {
res = (int)lua_tointeger(L, -1);
} else {
if (d < 0)
lj_err_callerv(L, LJ_ERR_OSDATEF, key);
res = d;
}
lua_pop(L, 1);
return res;
}
/* Index a C library by name. */
TValue *lj_clib_index(lua_State *L, CLibrary *cl, GCstr *name)
{
TValue *tv = lj_tab_setstr(L, cl->cache, name);
if (LJ_UNLIKELY(tvisnil(tv))) {
CTState *cts = ctype_cts(L);
CType *ct;
CTypeID id = lj_ctype_getname(cts, &ct, name, CLNS_INDEX);
if (!id)
lj_err_callerv(L, LJ_ERR_FFI_NODECL, strdata(name));
if (ctype_isconstval(ct->info)) {
CType *ctt = ctype_child(cts, ct);
lua_assert(ctype_isinteger(ctt->info) && ctt->size <= 4);
if ((ctt->info & CTF_UNSIGNED) && (int32_t)ct->size < 0)
setnumV(tv, (lua_Number)(uint32_t)ct->size);
else
setintV(tv, (int32_t)ct->size);
} else {
const char *sym = clib_extsym(cts, ct, name);
#if LJ_TARGET_WINDOWS
DWORD oldwerr = GetLastError();
#endif
void *p = clib_getsym(cl, sym);
GCcdata *cd;
lua_assert(ctype_isfunc(ct->info) || ctype_isextern(ct->info));
#if LJ_TARGET_X86 && LJ_ABI_WIN
/* Retry with decorated name for fastcall/stdcall functions. */
if (!p && ctype_isfunc(ct->info)) {
CTInfo cconv = ctype_cconv(ct->info);
if (cconv == CTCC_FASTCALL || cconv == CTCC_STDCALL) {
CTSize sz = clib_func_argsize(cts, ct);
const char *symd = lj_str_pushf(L,
cconv == CTCC_FASTCALL ? "@%s@%d" : "_%s@%d",
sym, sz);
L->top--;
p = clib_getsym(cl, symd);
}
}
#endif
if (!p)
clib_error(L, "cannot resolve symbol " LUA_QS ": %s", sym);
#if LJ_TARGET_WINDOWS
SetLastError(oldwerr);
#endif
cd = lj_cdata_new(cts, id, CTSIZE_PTR);
*(void **)cdataptr(cd) = p;
setcdataV(L, tv, cd);
}
}
return tv;
}
/* Bad conversion. */
LJ_NORET static void cconv_err_conv(CTState *cts, CType *d, CType *s,
CTInfo flags)
{
const char *dst = strdata(lj_ctype_repr(cts->L, ctype_typeid(cts, d), NULL));
const char *src;
if ((flags & CCF_FROMTV))
src = lj_obj_typename[1+(ctype_isnum(s->info) ? LUA_TNUMBER :
ctype_isarray(s->info) ? LUA_TSTRING : LUA_TNIL)];
else
src = strdata(lj_ctype_repr(cts->L, ctype_typeid(cts, s), NULL));
if (CCF_GETARG(flags))
lj_err_argv(cts->L, CCF_GETARG(flags), LJ_ERR_FFI_BADCONV, src, dst);
else
lj_err_callerv(cts->L, LJ_ERR_FFI_BADCONV, src, dst);
}
static GCtab *lib_create_table(lua_State *L, const char *libname, int hsize)
{
if (libname) {
luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 16);
lua_getfield(L, -1, libname);
if (!tvistab(L->top-1)) {
L->top--;
if (luaL_findtable(L, LUA_GLOBALSINDEX, libname, hsize) != NULL)
lj_err_callerv(L, LJ_ERR_BADMODN, libname);
settabV(L, L->top, tabV(L->top-1));
L->top++;
lua_setfield(L, -3, libname); /* _LOADED[libname] = new table */
}
L->top--;
settabV(L, L->top-1, tabV(L->top));
} else {
lua_createtable(L, 0, hsize);
}
return tabV(L->top-1);
}
/* Initializer overflow. */
LJ_NORET static void cconv_err_initov(CTState *cts, CType *d)
{
const char *dst = strdata(lj_ctype_repr(cts->L, ctype_typeid(cts, d), NULL));
lj_err_callerv(cts->L, LJ_ERR_FFI_INITOV, dst);
}
