1/*
2** FFI library.
3** Copyright (C) 2005-2021 Mike Pall. See Copyright Notice in luajit.h
4*/
5
6#define lib_ffi_c
7#define LUA_LIB
8
9#include <errno.h>
10
11#include "lua.h"
12#include "lauxlib.h"
13#include "lualib.h"
14
15#include "lj_obj.h"
16
17#if LJ_HASFFI
18
19#include "lj_gc.h"
20#include "lj_err.h"
21#include "lj_str.h"
22#include "lj_tab.h"
23#include "lj_meta.h"
24#include "lj_ctype.h"
25#include "lj_cparse.h"
26#include "lj_cdata.h"
27#include "lj_cconv.h"
28#include "lj_carith.h"
29#include "lj_ccall.h"
30#include "lj_ccallback.h"
31#include "lj_clib.h"
32#include "lj_strfmt.h"
33#include "lj_ff.h"
34#include "lj_lib.h"
35
36/* -- C type checks ------------------------------------------------------- */
37
38/* Check first argument for a C type and returns its ID. */
39static CTypeID ffi_checkctype(lua_State *L, CTState *cts, TValue *param)
40{
41 TValue *o = L->base;
42 if (!(o < L->top)) {
43 err_argtype:
44 lj_err_argtype(L, 1, "C type");
45 }
46 if (tvisstr(o)) { /* Parse an abstract C type declaration. */
47 GCstr *s = strV(o);
48 CPState cp;
49 int errcode;
50 cp.L = L;
51 cp.cts = cts;
52 cp.srcname = strdata(s);
53 cp.p = strdata(s);
54 cp.param = param;
55 cp.mode = CPARSE_MODE_ABSTRACT|CPARSE_MODE_NOIMPLICIT;
56 errcode = lj_cparse(&cp);
57 if (errcode) lj_err_throw(L, errcode); /* Propagate errors. */
58 return cp.val.id;
59 } else {
60 GCcdata *cd;
61 if (!tviscdata(o)) goto err_argtype;
62 if (param && param < L->top) lj_err_arg(L, 1, LJ_ERR_FFI_NUMPARAM);
63 cd = cdataV(o);
64 return cd->ctypeid == CTID_CTYPEID ? *(CTypeID *)cdataptr(cd) : cd->ctypeid;
65 }
66}
67
68/* Check argument for C data and return it. */
69static GCcdata *ffi_checkcdata(lua_State *L, int narg)
70{
71 TValue *o = L->base + narg-1;
72 if (!(o < L->top && tviscdata(o)))
73 lj_err_argt(L, narg, LUA_TCDATA);
74 return cdataV(o);
75}
76
77/* Convert argument to C pointer. */
78static void *ffi_checkptr(lua_State *L, int narg, CTypeID id)
79{
80 CTState *cts = ctype_cts(L);
81 TValue *o = L->base + narg-1;
82 void *p;
83 if (o >= L->top)
84 lj_err_arg(L, narg, LJ_ERR_NOVAL);
85 lj_cconv_ct_tv(cts, ctype_get(cts, id), (uint8_t *)&p, o, CCF_ARG(narg));
86 return p;
87}
88
89/* Convert argument to int32_t. */
90static int32_t ffi_checkint(lua_State *L, int narg)
91{
92 CTState *cts = ctype_cts(L);
93 TValue *o = L->base + narg-1;
94 int32_t i;
95 if (o >= L->top)
96 lj_err_arg(L, narg, LJ_ERR_NOVAL);
97 lj_cconv_ct_tv(cts, ctype_get(cts, CTID_INT32), (uint8_t *)&i, o,
98 CCF_ARG(narg));
99 return i;
100}
101
102/* -- C type metamethods -------------------------------------------------- */
103
104#define LJLIB_MODULE_ffi_meta
105
106/* Handle ctype __index/__newindex metamethods. */
107static int ffi_index_meta(lua_State *L, CTState *cts, CType *ct, MMS mm)
108{
109 CTypeID id = ctype_typeid(cts, ct);
110 cTValue *tv = lj_ctype_meta(cts, id, mm);
111 TValue *base = L->base;
112 if (!tv) {
113 const char *s;
114 err_index:
115 s = strdata(lj_ctype_repr(L, id, NULL));
116 if (tvisstr(L->base+1)) {
117 lj_err_callerv(L, LJ_ERR_FFI_BADMEMBER, s, strVdata(L->base+1));
118 } else {
119 const char *key = tviscdata(L->base+1) ?
120 strdata(lj_ctype_repr(L, cdataV(L->base+1)->ctypeid, NULL)) :
121 lj_typename(L->base+1);
122 lj_err_callerv(L, LJ_ERR_FFI_BADIDXW, s, key);
123 }
124 }
125 if (!tvisfunc(tv)) {
126 if (mm == MM_index) {
127 cTValue *o = lj_meta_tget(L, tv, base+1);
128 if (o) {
129 if (tvisnil(o)) goto err_index;
130 copyTV(L, L->top-1, o);
131 return 1;
132 }
133 } else {
134 TValue *o = lj_meta_tset(L, tv, base+1);
135 if (o) {
136 copyTV(L, o, base+2);
137 return 0;
138 }
139 }
140 copyTV(L, base, L->top);
141 tv = L->top-1-LJ_FR2;
142 }
143 return lj_meta_tailcall(L, tv);
144}
145
146LJLIB_CF(ffi_meta___index) LJLIB_REC(cdata_index 0)
147{
148 CTState *cts = ctype_cts(L);
149 CTInfo qual = 0;
150 CType *ct;
151 uint8_t *p;
152 TValue *o = L->base;
153 if (!(o+1 < L->top && tviscdata(o))) /* Also checks for presence of key. */
154 lj_err_argt(L, 1, LUA_TCDATA);
155 ct = lj_cdata_index(cts, cdataV(o), o+1, &p, &qual);
156 if ((qual & 1))
157 return ffi_index_meta(L, cts, ct, MM_index);
158 if (lj_cdata_get(cts, ct, L->top-1, p))
159 lj_gc_check(L);
160 return 1;
161}
162
163LJLIB_CF(ffi_meta___newindex) LJLIB_REC(cdata_index 1)
164{
165 CTState *cts = ctype_cts(L);
166 CTInfo qual = 0;
167 CType *ct;
168 uint8_t *p;
169 TValue *o = L->base;
170 if (!(o+2 < L->top && tviscdata(o))) /* Also checks for key and value. */
171 lj_err_argt(L, 1, LUA_TCDATA);
172 ct = lj_cdata_index(cts, cdataV(o), o+1, &p, &qual);
173 if ((qual & 1)) {
174 if ((qual & CTF_CONST))
175 lj_err_caller(L, LJ_ERR_FFI_WRCONST);
176 return ffi_index_meta(L, cts, ct, MM_newindex);
177 }
178 lj_cdata_set(cts, ct, p, o+2, qual);
179 return 0;
180}
181
182/* Common handler for cdata arithmetic. */
183static int ffi_arith(lua_State *L)
184{
185 MMS mm = (MMS)(curr_func(L)->c.ffid - (int)FF_ffi_meta___eq + (int)MM_eq);
186 return lj_carith_op(L, mm);
187}
188
189/* The following functions must be in contiguous ORDER MM. */
190LJLIB_CF(ffi_meta___eq) LJLIB_REC(cdata_arith MM_eq)
191{
192 return ffi_arith(L);
193}
194
195LJLIB_CF(ffi_meta___len) LJLIB_REC(cdata_arith MM_len)
196{
197 return ffi_arith(L);
198}
199
200LJLIB_CF(ffi_meta___lt) LJLIB_REC(cdata_arith MM_lt)
201{
202 return ffi_arith(L);
203}
204
205LJLIB_CF(ffi_meta___le) LJLIB_REC(cdata_arith MM_le)
206{
207 return ffi_arith(L);
208}
209
210LJLIB_CF(ffi_meta___concat) LJLIB_REC(cdata_arith MM_concat)
211{
212 return ffi_arith(L);
213}
214
215/* Forward declaration. */
216static int lj_cf_ffi_new(lua_State *L);
217
218LJLIB_CF(ffi_meta___call) LJLIB_REC(cdata_call)
219{
220 CTState *cts = ctype_cts(L);
221 GCcdata *cd = ffi_checkcdata(L, 1);
222 CTypeID id = cd->ctypeid;
223 CType *ct;
224 cTValue *tv;
225 MMS mm = MM_call;
226 if (cd->ctypeid == CTID_CTYPEID) {
227 id = *(CTypeID *)cdataptr(cd);
228 mm = MM_new;
229 } else {
230 int ret = lj_ccall_func(L, cd);
231 if (ret >= 0)
232 return ret;
233 }
234 /* Handle ctype __call/__new metamethod. */
235 ct = ctype_raw(cts, id);
236 if (ctype_isptr(ct->info)) id = ctype_cid(ct->info);
237 tv = lj_ctype_meta(cts, id, mm);
238 if (tv)
239 return lj_meta_tailcall(L, tv);
240 else if (mm == MM_call)
241 lj_err_callerv(L, LJ_ERR_FFI_BADCALL, strdata(lj_ctype_repr(L, id, NULL)));
242 return lj_cf_ffi_new(L);
243}
244
245LJLIB_CF(ffi_meta___add) LJLIB_REC(cdata_arith MM_add)
246{
247 return ffi_arith(L);
248}
249
250LJLIB_CF(ffi_meta___sub) LJLIB_REC(cdata_arith MM_sub)
251{
252 return ffi_arith(L);
253}
254
255LJLIB_CF(ffi_meta___mul) LJLIB_REC(cdata_arith MM_mul)
256{
257 return ffi_arith(L);
258}
259
260LJLIB_CF(ffi_meta___div) LJLIB_REC(cdata_arith MM_div)
261{
262 return ffi_arith(L);
263}
264
265LJLIB_CF(ffi_meta___mod) LJLIB_REC(cdata_arith MM_mod)
266{
267 return ffi_arith(L);
268}
269
270LJLIB_CF(ffi_meta___pow) LJLIB_REC(cdata_arith MM_pow)
271{
272 return ffi_arith(L);
273}
274
275LJLIB_CF(ffi_meta___unm) LJLIB_REC(cdata_arith MM_unm)
276{
277 return ffi_arith(L);
278}
279/* End of contiguous ORDER MM. */
280
281LJLIB_CF(ffi_meta___tostring)
282{
283 GCcdata *cd = ffi_checkcdata(L, 1);
284 const char *msg = "cdata<%s>: %p";
285 CTypeID id = cd->ctypeid;
286 void *p = cdataptr(cd);
287 if (id == CTID_CTYPEID) {
288 msg = "ctype<%s>";
289 id = *(CTypeID *)p;
290 } else {
291 CTState *cts = ctype_cts(L);
292 CType *ct = ctype_raw(cts, id);
293 if (ctype_isref(ct->info)) {
294 p = *(void **)p;
295 ct = ctype_rawchild(cts, ct);
296 }
297 if (ctype_iscomplex(ct->info)) {
298 setstrV(L, L->top-1, lj_ctype_repr_complex(L, cdataptr(cd), ct->size));
299 goto checkgc;
300 } else if (ct->size == 8 && ctype_isinteger(ct->info)) {
301 setstrV(L, L->top-1, lj_ctype_repr_int64(L, *(uint64_t *)cdataptr(cd),
302 (ct->info & CTF_UNSIGNED)));
303 goto checkgc;
304 } else if (ctype_isfunc(ct->info)) {
305 p = *(void **)p;
306 } else if (ctype_isenum(ct->info)) {
307 msg = "cdata<%s>: %d";
308 p = (void *)(uintptr_t)*(uint32_t **)p;
309 } else {
310 if (ctype_isptr(ct->info)) {
311 p = cdata_getptr(p, ct->size);
312 ct = ctype_rawchild(cts, ct);
313 }
314 if (ctype_isstruct(ct->info) || ctype_isvector(ct->info)) {
315 /* Handle ctype __tostring metamethod. */
316 cTValue *tv = lj_ctype_meta(cts, ctype_typeid(cts, ct), MM_tostring);
317 if (tv)
318 return lj_meta_tailcall(L, tv);
319 }
320 }
321 }
322 lj_strfmt_pushf(L, msg, strdata(lj_ctype_repr(L, id, NULL)), p);
323checkgc:
324 lj_gc_check(L);
325 return 1;
326}
327
328static int ffi_pairs(lua_State *L, MMS mm)
329{
330 CTState *cts = ctype_cts(L);
331 CTypeID id = ffi_checkcdata(L, 1)->ctypeid;
332 CType *ct = ctype_raw(cts, id);
333 cTValue *tv;
334 if (ctype_isptr(ct->info)) id = ctype_cid(ct->info);
335 tv = lj_ctype_meta(cts, id, mm);
336 if (!tv)
337 lj_err_callerv(L, LJ_ERR_FFI_BADMM, strdata(lj_ctype_repr(L, id, NULL)),
338 strdata(mmname_str(G(L), mm)));
339 return lj_meta_tailcall(L, tv);
340}
341
342LJLIB_CF(ffi_meta___pairs)
343{
344 return ffi_pairs(L, MM_pairs);
345}
346
347LJLIB_CF(ffi_meta___ipairs)
348{
349 return ffi_pairs(L, MM_ipairs);
350}
351
352LJLIB_PUSH("ffi") LJLIB_SET(__metatable)
353
354#include "lj_libdef.h"
355
356/* -- C library metamethods ----------------------------------------------- */
357
358#define LJLIB_MODULE_ffi_clib
359
360/* Index C library by a name. */
361static TValue *ffi_clib_index(lua_State *L)
362{
363 TValue *o = L->base;
364 CLibrary *cl;
365 if (!(o < L->top && tvisudata(o) && udataV(o)->udtype == UDTYPE_FFI_CLIB))
366 lj_err_argt(L, 1, LUA_TUSERDATA);
367 cl = (CLibrary *)uddata(udataV(o));
368 if (!(o+1 < L->top && tvisstr(o+1)))
369 lj_err_argt(L, 2, LUA_TSTRING);
370 return lj_clib_index(L, cl, strV(o+1));
371}
372
373LJLIB_CF(ffi_clib___index) LJLIB_REC(clib_index 1)
374{
375 TValue *tv = ffi_clib_index(L);
376 if (tviscdata(tv)) {
377 CTState *cts = ctype_cts(L);
378 GCcdata *cd = cdataV(tv);
379 CType *s = ctype_get(cts, cd->ctypeid);
380 if (ctype_isextern(s->info)) {
381 CTypeID sid = ctype_cid(s->info);
382 void *sp = *(void **)cdataptr(cd);
383 CType *ct = ctype_raw(cts, sid);
384 if (lj_cconv_tv_ct(cts, ct, sid, L->top-1, sp))
385 lj_gc_check(L);
386 return 1;
387 }
388 }
389 copyTV(L, L->top-1, tv);
390 return 1;
391}
392
393LJLIB_CF(ffi_clib___newindex) LJLIB_REC(clib_index 0)
394{
395 TValue *tv = ffi_clib_index(L);
396 TValue *o = L->base+2;
397 if (o < L->top && tviscdata(tv)) {
398 CTState *cts = ctype_cts(L);
399 GCcdata *cd = cdataV(tv);
400 CType *d = ctype_get(cts, cd->ctypeid);
401 if (ctype_isextern(d->info)) {
402 CTInfo qual = 0;
403 for (;;) { /* Skip attributes and collect qualifiers. */
404 d = ctype_child(cts, d);
405 if (!ctype_isattrib(d->info)) break;
406 if (ctype_attrib(d->info) == CTA_QUAL) qual |= d->size;
407 }
408 if (!((d->info|qual) & CTF_CONST)) {
409 lj_cconv_ct_tv(cts, d, *(void **)cdataptr(cd), o, 0);
410 return 0;
411 }
412 }
413 }
414 lj_err_caller(L, LJ_ERR_FFI_WRCONST);
415 return 0; /* unreachable */
416}
417
418LJLIB_CF(ffi_clib___gc)
419{
420 TValue *o = L->base;
421 if (o < L->top && tvisudata(o) && udataV(o)->udtype == UDTYPE_FFI_CLIB)
422 lj_clib_unload((CLibrary *)uddata(udataV(o)));
423 return 0;
424}
425
426#include "lj_libdef.h"
427
428/* -- Callback function metamethods --------------------------------------- */
429
430#define LJLIB_MODULE_ffi_callback
431
432static int ffi_callback_set(lua_State *L, GCfunc *fn)
433{
434 GCcdata *cd = ffi_checkcdata(L, 1);
435 CTState *cts = ctype_cts(L);
436 CType *ct = ctype_raw(cts, cd->ctypeid);
437 if (ctype_isptr(ct->info) && (LJ_32 || ct->size == 8)) {
438 MSize slot = lj_ccallback_ptr2slot(cts, *(void **)cdataptr(cd));
439 if (slot < cts->cb.sizeid && cts->cb.cbid[slot] != 0) {
440 GCtab *t = cts->miscmap;
441 TValue *tv = lj_tab_setint(L, t, (int32_t)slot);
442 if (fn) {
443 setfuncV(L, tv, fn);
444 lj_gc_anybarriert(L, t);
445 } else {
446 setnilV(tv);
447 cts->cb.cbid[slot] = 0;
448 cts->cb.topid = slot < cts->cb.topid ? slot : cts->cb.topid;
449 }
450 return 0;
451 }
452 }
453 lj_err_caller(L, LJ_ERR_FFI_BADCBACK);
454 return 0;
455}
456
457LJLIB_CF(ffi_callback_free)
458{
459 return ffi_callback_set(L, NULL);
460}
461
462LJLIB_CF(ffi_callback_set)
463{
464 GCfunc *fn = lj_lib_checkfunc(L, 2);
465 return ffi_callback_set(L, fn);
466}
467
468LJLIB_PUSH(top-1) LJLIB_SET(__index)
469
470#include "lj_libdef.h"
471
472/* -- FFI library functions ----------------------------------------------- */
473
474#define LJLIB_MODULE_ffi
475
476LJLIB_CF(ffi_cdef)
477{
478 GCstr *s = lj_lib_checkstr(L, 1);
479 CPState cp;
480 int errcode;
481 cp.L = L;
482 cp.cts = ctype_cts(L);
483 cp.srcname = strdata(s);
484 cp.p = strdata(s);
485 cp.param = L->base+1;
486 cp.mode = CPARSE_MODE_MULTI|CPARSE_MODE_DIRECT;
487 errcode = lj_cparse(&cp);
488 if (errcode) lj_err_throw(L, errcode); /* Propagate errors. */
489 lj_gc_check(L);
490 return 0;
491}
492
493LJLIB_CF(ffi_new) LJLIB_REC(.)
494{
495 CTState *cts = ctype_cts(L);
496 CTypeID id = ffi_checkctype(L, cts, NULL);
497 CType *ct = ctype_raw(cts, id);
498 CTSize sz;
499 CTInfo info = lj_ctype_info(cts, id, &sz);
500 TValue *o = L->base+1;
501 GCcdata *cd;
502 if ((info & CTF_VLA)) {
503 o++;
504 sz = lj_ctype_vlsize(cts, ct, (CTSize)ffi_checkint(L, 2));
505 }
506 if (sz == CTSIZE_INVALID)
507 lj_err_arg(L, 1, LJ_ERR_FFI_INVSIZE);
508 cd = lj_cdata_newx(cts, id, sz, info);
509 setcdataV(L, o-1, cd); /* Anchor the uninitialized cdata. */
510 lj_cconv_ct_init(cts, ct, sz, cdataptr(cd),
511 o, (MSize)(L->top - o)); /* Initialize cdata. */
512 if (ctype_isstruct(ct->info)) {
513 /* Handle ctype __gc metamethod. Use the fast lookup here. */
514 cTValue *tv = lj_tab_getinth(cts->miscmap, -(int32_t)id);
515 if (tv && tvistab(tv) && (tv = lj_meta_fast(L, tabV(tv), MM_gc))) {
516 GCtab *t = cts->finalizer;
517 if (gcref(t->metatable)) {
518 /* Add to finalizer table, if still enabled. */
519 copyTV(L, lj_tab_set(L, t, o-1), tv);
520 lj_gc_anybarriert(L, t);
521 cd->marked |= LJ_GC_CDATA_FIN;
522 }
523 }
524 }
525 L->top = o; /* Only return the cdata itself. */
526 lj_gc_check(L);
527 return 1;
528}
529
530LJLIB_CF(ffi_cast) LJLIB_REC(ffi_new)
531{
532 CTState *cts = ctype_cts(L);
533 CTypeID id = ffi_checkctype(L, cts, NULL);
534 CType *d = ctype_raw(cts, id);
535 TValue *o = lj_lib_checkany(L, 2);
536 L->top = o+1; /* Make sure this is the last item on the stack. */
537 if (!(ctype_isnum(d->info) || ctype_isptr(d->info) || ctype_isenum(d->info)))
538 lj_err_arg(L, 1, LJ_ERR_FFI_INVTYPE);
539 if (!(tviscdata(o) && cdataV(o)->ctypeid == id)) {
540 GCcdata *cd = lj_cdata_new(cts, id, d->size);
541 lj_cconv_ct_tv(cts, d, cdataptr(cd), o, CCF_CAST);
542 setcdataV(L, o, cd);
543 lj_gc_check(L);
544 }
545 return 1;
546}
547
548LJLIB_CF(ffi_typeof) LJLIB_REC(.)
549{
550 CTState *cts = ctype_cts(L);
551 CTypeID id = ffi_checkctype(L, cts, L->base+1);
552 GCcdata *cd = lj_cdata_new(cts, CTID_CTYPEID, 4);
553 *(CTypeID *)cdataptr(cd) = id;
554 setcdataV(L, L->top-1, cd);
555 lj_gc_check(L);
556 return 1;
557}
558
559/* Internal and unsupported API. */
560LJLIB_CF(ffi_typeinfo)
561{
562 CTState *cts = ctype_cts(L);
563 CTypeID id = (CTypeID)ffi_checkint(L, 1);
564 if (id > 0 && id < cts->top) {
565 CType *ct = ctype_get(cts, id);
566 GCtab *t;
567 lua_createtable(L, 0, 4); /* Increment hash size if fields are added. */
568 t = tabV(L->top-1);
569 setintV(lj_tab_setstr(L, t, lj_str_newlit(L, "info")), (int32_t)ct->info);
570 if (ct->size != CTSIZE_INVALID)
571 setintV(lj_tab_setstr(L, t, lj_str_newlit(L, "size")), (int32_t)ct->size);
572 if (ct->sib)
573 setintV(lj_tab_setstr(L, t, lj_str_newlit(L, "sib")), (int32_t)ct->sib);
574 if (gcref(ct->name)) {
575 GCstr *s = gco2str(gcref(ct->name));
576 setstrV(L, lj_tab_setstr(L, t, lj_str_newlit(L, "name")), s);
577 }
578 lj_gc_check(L);
579 return 1;
580 }
581 return 0;
582}
583
584LJLIB_CF(ffi_istype) LJLIB_REC(.)
585{
586 CTState *cts = ctype_cts(L);
587 CTypeID id1 = ffi_checkctype(L, cts, NULL);
588 TValue *o = lj_lib_checkany(L, 2);
589 int b = 0;
590 if (tviscdata(o)) {
591 GCcdata *cd = cdataV(o);
592 CTypeID id2 = cd->ctypeid == CTID_CTYPEID ? *(CTypeID *)cdataptr(cd) :
593 cd->ctypeid;
594 CType *ct1 = lj_ctype_rawref(cts, id1);
595 CType *ct2 = lj_ctype_rawref(cts, id2);
596 if (ct1 == ct2) {
597 b = 1;
598 } else if (ctype_type(ct1->info) == ctype_type(ct2->info) &&
599 ct1->size == ct2->size) {
600 if (ctype_ispointer(ct1->info))
601 b = lj_cconv_compatptr(cts, ct1, ct2, CCF_IGNQUAL);
602 else if (ctype_isnum(ct1->info) || ctype_isvoid(ct1->info))
603 b = (((ct1->info ^ ct2->info) & ~(CTF_QUAL|CTF_LONG)) == 0);
604 } else if (ctype_isstruct(ct1->info) && ctype_isptr(ct2->info) &&
605 ct1 == ctype_rawchild(cts, ct2)) {
606 b = 1;
607 }
608 }
609 setboolV(L->top-1, b);
610 setboolV(&G(L)->tmptv2, b); /* Remember for trace recorder. */
611 return 1;
612}
613
614LJLIB_CF(ffi_sizeof) LJLIB_REC(ffi_xof FF_ffi_sizeof)
615{
616 CTState *cts = ctype_cts(L);
617 CTypeID id = ffi_checkctype(L, cts, NULL);
618 CTSize sz;
619 if (LJ_UNLIKELY(tviscdata(L->base) && cdataisv(cdataV(L->base)))) {
620 sz = cdatavlen(cdataV(L->base));
621 } else {
622 CType *ct = lj_ctype_rawref(cts, id);
623 if (ctype_isvltype(ct->info))
624 sz = lj_ctype_vlsize(cts, ct, (CTSize)ffi_checkint(L, 2));
625 else
626 sz = ctype_hassize(ct->info) ? ct->size : CTSIZE_INVALID;
627 if (LJ_UNLIKELY(sz == CTSIZE_INVALID)) {
628 setnilV(L->top-1);
629 return 1;
630 }
631 }
632 setintV(L->top-1, (int32_t)sz);
633 return 1;
634}
635
636LJLIB_CF(ffi_alignof) LJLIB_REC(ffi_xof FF_ffi_alignof)
637{
638 CTState *cts = ctype_cts(L);
639 CTypeID id = ffi_checkctype(L, cts, NULL);
640 CTSize sz = 0;
641 CTInfo info = lj_ctype_info(cts, id, &sz);
642 setintV(L->top-1, 1 << ctype_align(info));
643 return 1;
644}
645
646LJLIB_CF(ffi_offsetof) LJLIB_REC(ffi_xof FF_ffi_offsetof)
647{
648 CTState *cts = ctype_cts(L);
649 CTypeID id = ffi_checkctype(L, cts, NULL);
650 GCstr *name = lj_lib_checkstr(L, 2);
651 CType *ct = lj_ctype_rawref(cts, id);
652 CTSize ofs;
653 if (ctype_isstruct(ct->info) && ct->size != CTSIZE_INVALID) {
654 CType *fct = lj_ctype_getfield(cts, ct, name, &ofs);
655 if (fct) {
656 setintV(L->top-1, ofs);
657 if (ctype_isfield(fct->info)) {
658 return 1;
659 } else if (ctype_isbitfield(fct->info)) {
660 setintV(L->top++, ctype_bitpos(fct->info));
661 setintV(L->top++, ctype_bitbsz(fct->info));
662 return 3;
663 }
664 }
665 }
666 return 0;
667}
668
669LJLIB_CF(ffi_errno) LJLIB_REC(.)
670{
671 int err = errno;
672 if (L->top > L->base)
673 errno = ffi_checkint(L, 1);
674 setintV(L->top++, err);
675 return 1;
676}
677
678LJLIB_CF(ffi_string) LJLIB_REC(.)
679{
680 CTState *cts = ctype_cts(L);
681 TValue *o = lj_lib_checkany(L, 1);
682 const char *p;
683 size_t len;
684 if (o+1 < L->top && !tvisnil(o+1)) {
685 len = (size_t)ffi_checkint(L, 2);
686 lj_cconv_ct_tv(cts, ctype_get(cts, CTID_P_CVOID), (uint8_t *)&p, o,
687 CCF_ARG(1));
688 } else {
689 lj_cconv_ct_tv(cts, ctype_get(cts, CTID_P_CCHAR), (uint8_t *)&p, o,
690 CCF_ARG(1));
691 len = strlen(p);
692 }
693 L->top = o+1; /* Make sure this is the last item on the stack. */
694 setstrV(L, o, lj_str_new(L, p, len));
695 lj_gc_check(L);
696 return 1;
697}
698
699LJLIB_CF(ffi_copy) LJLIB_REC(.)
700{
701 void *dp = ffi_checkptr(L, 1, CTID_P_VOID);
702 void *sp = ffi_checkptr(L, 2, CTID_P_CVOID);
703 TValue *o = L->base+1;
704 CTSize len;
705 if (tvisstr(o) && o+1 >= L->top)
706 len = strV(o)->len+1; /* Copy Lua string including trailing '\0'. */
707 else
708 len = (CTSize)ffi_checkint(L, 3);
709 memcpy(dp, sp, len);
710 return 0;
711}
712
713LJLIB_CF(ffi_fill) LJLIB_REC(.)
714{
715 void *dp = ffi_checkptr(L, 1, CTID_P_VOID);
716 CTSize len = (CTSize)ffi_checkint(L, 2);
717 int32_t fill = 0;
718 if (L->base+2 < L->top && !tvisnil(L->base+2)) fill = ffi_checkint(L, 3);
719 memset(dp, fill, len);
720 return 0;
721}
722
723/* Test ABI string. */
724LJLIB_CF(ffi_abi) LJLIB_REC(.)
725{
726 GCstr *s = lj_lib_checkstr(L, 1);
727 int b = lj_cparse_case(s,
728#if LJ_64
729 "\00564bit"
730#else
731 "\00532bit"
732#endif
733#if LJ_ARCH_HASFPU
734 "\003fpu"
735#endif
736#if LJ_ABI_SOFTFP
737 "\006softfp"
738#else
739 "\006hardfp"
740#endif
741#if LJ_ABI_EABI
742 "\004eabi"
743#endif
744#if LJ_ABI_WIN
745 "\003win"
746#endif
747#if LJ_TARGET_UWP
748 "\003uwp"
749#endif
750#if LJ_LE
751 "\002le"
752#else
753 "\002be"
754#endif
755#if LJ_GC64
756 "\004gc64"
757#endif
758 ) >= 0;
759 setboolV(L->top-1, b);
760 setboolV(&G(L)->tmptv2, b); /* Remember for trace recorder. */
761 return 1;
762}
763
764LJLIB_PUSH(top-8) LJLIB_SET(!) /* Store reference to miscmap table. */
765
766LJLIB_CF(ffi_metatype)
767{
768 CTState *cts = ctype_cts(L);
769 CTypeID id = ffi_checkctype(L, cts, NULL);
770 GCtab *mt = lj_lib_checktab(L, 2);
771 GCtab *t = cts->miscmap;
772 CType *ct = ctype_get(cts, id); /* Only allow raw types. */
773 TValue *tv;
774 GCcdata *cd;
775 if (!(ctype_isstruct(ct->info) || ctype_iscomplex(ct->info) ||
776 ctype_isvector(ct->info)))
777 lj_err_arg(L, 1, LJ_ERR_FFI_INVTYPE);
778 tv = lj_tab_setinth(L, t, -(int32_t)id);
779 if (!tvisnil(tv))
780 lj_err_caller(L, LJ_ERR_PROTMT);
781 settabV(L, tv, mt);
782 lj_gc_anybarriert(L, t);
783 cd = lj_cdata_new(cts, CTID_CTYPEID, 4);
784 *(CTypeID *)cdataptr(cd) = id;
785 setcdataV(L, L->top-1, cd);
786 lj_gc_check(L);
787 return 1;
788}
789
790LJLIB_PUSH(top-7) LJLIB_SET(!) /* Store reference to finalizer table. */
791
792LJLIB_CF(ffi_gc) LJLIB_REC(.)
793{
794 GCcdata *cd = ffi_checkcdata(L, 1);
795 TValue *fin = lj_lib_checkany(L, 2);
796 CTState *cts = ctype_cts(L);
797 CType *ct = ctype_raw(cts, cd->ctypeid);
798 if (!(ctype_isptr(ct->info) || ctype_isstruct(ct->info) ||
799 ctype_isrefarray(ct->info)))
800 lj_err_arg(L, 1, LJ_ERR_FFI_INVTYPE);
801 lj_cdata_setfin(L, cd, gcval(fin), itype(fin));
802 L->top = L->base+1; /* Pass through the cdata object. */
803 return 1;
804}
805
806LJLIB_PUSH(top-5) LJLIB_SET(!) /* Store clib metatable in func environment. */
807
808LJLIB_CF(ffi_load)
809{
810 GCstr *name = lj_lib_checkstr(L, 1);
811 int global = (L->base+1 < L->top && tvistruecond(L->base+1));
812 lj_clib_load(L, tabref(curr_func(L)->c.env), name, global);
813 return 1;
814}
815
816LJLIB_PUSH(top-4) LJLIB_SET(C)
817LJLIB_PUSH(top-3) LJLIB_SET(os)
818LJLIB_PUSH(top-2) LJLIB_SET(arch)
819
820#include "lj_libdef.h"
821
822/* ------------------------------------------------------------------------ */
823
824/* Create special weak-keyed finalizer table. */
825static GCtab *ffi_finalizer(lua_State *L)
826{
827 /* NOBARRIER: The table is new (marked white). */
828 GCtab *t = lj_tab_new(L, 0, 1);
829 settabV(L, L->top++, t);
830 setgcref(t->metatable, obj2gco(t));
831 setstrV(L, lj_tab_setstr(L, t, lj_str_newlit(L, "__mode")),
832 lj_str_newlit(L, "k"));
833 t->nomm = (uint8_t)(~(1u<<MM_mode));
834 return t;
835}
836
837/* Register FFI module as loaded. */
838static void ffi_register_module(lua_State *L)
839{
840 cTValue *tmp = lj_tab_getstr(tabV(registry(L)), lj_str_newlit(L, "_LOADED"));
841 if (tmp && tvistab(tmp)) {
842 GCtab *t = tabV(tmp);
843 copyTV(L, lj_tab_setstr(L, t, lj_str_newlit(L, LUA_FFILIBNAME)), L->top-1);
844 lj_gc_anybarriert(L, t);
845 }
846}
847
848LUALIB_API int luaopen_ffi(lua_State *L)
849{
850 CTState *cts = lj_ctype_init(L);
851 settabV(L, L->top++, (cts->miscmap = lj_tab_new(L, 0, 1)));
852 cts->finalizer = ffi_finalizer(L);
853 LJ_LIB_REG(L, NULL, ffi_meta);
854 /* NOBARRIER: basemt is a GC root. */
855 setgcref(basemt_it(G(L), LJ_TCDATA), obj2gco(tabV(L->top-1)));
856 LJ_LIB_REG(L, NULL, ffi_clib);
857 LJ_LIB_REG(L, NULL, ffi_callback);
858 /* NOBARRIER: the key is new and lj_tab_newkey() handles the barrier. */
859 settabV(L, lj_tab_setstr(L, cts->miscmap, &cts->g->strempty), tabV(L->top-1));
860 L->top--;
861 lj_clib_default(L, tabV(L->top-1)); /* Create ffi.C default namespace. */
862 lua_pushliteral(L, LJ_OS_NAME);
863 lua_pushliteral(L, LJ_ARCH_NAME);
864 LJ_LIB_REG(L, NULL, ffi); /* Note: no global "ffi" created! */
865 ffi_register_module(L);
866 return 1;
867}
868
869#endif
870