/* 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; }
/* Free a C data object. */ void LJ_FASTCALL lj_cdata_free(global_State *g, GCcdata *cd) { if (LJ_UNLIKELY(cd->marked & LJ_GC_CDATA_FIN)) { GCobj *root; makewhite(g, obj2gco(cd)); markfinalized(obj2gco(cd)); if ((root = gcref(g->gc.mmudata)) != NULL) { setgcrefr(cd->nextgc, root->gch.nextgc); setgcref(root->gch.nextgc, obj2gco(cd)); setgcref(g->gc.mmudata, obj2gco(cd)); } else { setgcref(cd->nextgc, obj2gco(cd)); setgcref(g->gc.mmudata, obj2gco(cd)); } } else if (LJ_LIKELY(!cdataisv(cd))) { CType *ct = ctype_raw(ctype_ctsG(g), cd->ctypeid); CTSize sz = ctype_hassize(ct->info) ? ct->size : CTSIZE_PTR; lua_assert(ctype_hassize(ct->info) || ctype_isfunc(ct->info) || ctype_isextern(ct->info)); lj_mem_free(g, cd, sizeof(GCcdata) + sz); } else { lj_mem_free(g, memcdatav(cd), sizecdatav(cd)); } }