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Aegisub/subprojects/luajit/src/lib_ffi.c

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/*
** FFI library.
** Copyright (C) 2005-2017 Mike Pall. See Copyright Notice in luajit.h
*/
#define lib_ffi_c
#define LUA_LIB
#include <errno.h>
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
#include "lj_obj.h"
#if LJ_HASFFI
#include "lj_gc.h"
#include "lj_err.h"
#include "lj_str.h"
#include "lj_tab.h"
#include "lj_meta.h"
#include "lj_ctype.h"
#include "lj_cparse.h"
#include "lj_cdata.h"
#include "lj_cconv.h"
#include "lj_carith.h"
#include "lj_ccall.h"
#include "lj_ccallback.h"
#include "lj_clib.h"
#include "lj_ff.h"
#include "lj_lib.h"
/* -- C type checks ------------------------------------------------------- */
/* Check first argument for a C type and returns its ID. */
static CTypeID ffi_checkctype(lua_State *L, CTState *cts, TValue *param)
{
TValue *o = L->base;
if (!(o < L->top)) {
err_argtype:
lj_err_argtype(L, 1, "C type");
}
if (tvisstr(o)) { /* Parse an abstract C type declaration. */
GCstr *s = strV(o);
CPState cp;
int errcode;
cp.L = L;
cp.cts = cts;
cp.srcname = strdata(s);
cp.p = strdata(s);
cp.param = param;
cp.mode = CPARSE_MODE_ABSTRACT|CPARSE_MODE_NOIMPLICIT;
errcode = lj_cparse(&cp);
if (errcode) lj_err_throw(L, errcode); /* Propagate errors. */
return cp.val.id;
} else {
GCcdata *cd;
if (!tviscdata(o)) goto err_argtype;
if (param && param < L->top) lj_err_arg(L, 1, LJ_ERR_FFI_NUMPARAM);
cd = cdataV(o);
return cd->ctypeid == CTID_CTYPEID ? *(CTypeID *)cdataptr(cd) : cd->ctypeid;
}
}
/* Check argument for C data and return it. */
static GCcdata *ffi_checkcdata(lua_State *L, int narg)
{
TValue *o = L->base + narg-1;
if (!(o < L->top && tviscdata(o)))
lj_err_argt(L, narg, LUA_TCDATA);
return cdataV(o);
}
/* Convert argument to C pointer. */
static void *ffi_checkptr(lua_State *L, int narg, CTypeID id)
{
CTState *cts = ctype_cts(L);
TValue *o = L->base + narg-1;
void *p;
if (o >= L->top)
lj_err_arg(L, narg, LJ_ERR_NOVAL);
lj_cconv_ct_tv(cts, ctype_get(cts, id), (uint8_t *)&p, o, CCF_ARG(narg));
return p;
}
/* Convert argument to int32_t. */
static int32_t ffi_checkint(lua_State *L, int narg)
{
CTState *cts = ctype_cts(L);
TValue *o = L->base + narg-1;
int32_t i;
if (o >= L->top)
lj_err_arg(L, narg, LJ_ERR_NOVAL);
lj_cconv_ct_tv(cts, ctype_get(cts, CTID_INT32), (uint8_t *)&i, o,
CCF_ARG(narg));
return i;
}
/* -- C type metamethods -------------------------------------------------- */
#define LJLIB_MODULE_ffi_meta
/* 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 {
const char *key = tviscdata(L->base+1) ?
strdata(lj_ctype_repr(L, cdataV(L->base+1)->ctypeid, NULL)) :
lj_typename(L->base+1);
lj_err_callerv(L, LJ_ERR_FFI_BADIDXW, s, key);
}
}
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;
}
}
copyTV(L, base, L->top);
tv = L->top-1;
}
return lj_meta_tailcall(L, tv);
}
LJLIB_CF(ffi_meta___index) LJLIB_REC(cdata_index 0)
{
CTState *cts = ctype_cts(L);
CTInfo qual = 0;
CType *ct;
uint8_t *p;
TValue *o = L->base;
if (!(o+1 < L->top && tviscdata(o))) /* Also checks for presence of key. */
lj_err_argt(L, 1, LUA_TCDATA);
ct = lj_cdata_index(cts, cdataV(o), o+1, &p, &qual);
if ((qual & 1))
return ffi_index_meta(L, cts, ct, MM_index);
if (lj_cdata_get(cts, ct, L->top-1, p))
lj_gc_check(L);
return 1;
}
LJLIB_CF(ffi_meta___newindex) LJLIB_REC(cdata_index 1)
{
CTState *cts = ctype_cts(L);
CTInfo qual = 0;
CType *ct;
uint8_t *p;
TValue *o = L->base;
if (!(o+2 < L->top && tviscdata(o))) /* Also checks for key and value. */
lj_err_argt(L, 1, LUA_TCDATA);
ct = lj_cdata_index(cts, cdataV(o), o+1, &p, &qual);
if ((qual & 1)) {
if ((qual & CTF_CONST))
lj_err_caller(L, LJ_ERR_FFI_WRCONST);
return ffi_index_meta(L, cts, ct, MM_newindex);
}
lj_cdata_set(cts, ct, p, o+2, qual);
return 0;
}
/* Common handler for cdata arithmetic. */
static int ffi_arith(lua_State *L)
{
MMS mm = (MMS)(curr_func(L)->c.ffid - (int)FF_ffi_meta___eq + (int)MM_eq);
return lj_carith_op(L, mm);
}
/* The following functions must be in contiguous ORDER MM. */
LJLIB_CF(ffi_meta___eq) LJLIB_REC(cdata_arith MM_eq)
{
return ffi_arith(L);
}
LJLIB_CF(ffi_meta___len) LJLIB_REC(cdata_arith MM_len)
{
return ffi_arith(L);
}
LJLIB_CF(ffi_meta___lt) LJLIB_REC(cdata_arith MM_lt)
{
return ffi_arith(L);
}
LJLIB_CF(ffi_meta___le) LJLIB_REC(cdata_arith MM_le)
{
return ffi_arith(L);
}
LJLIB_CF(ffi_meta___concat) LJLIB_REC(cdata_arith MM_concat)
{
return ffi_arith(L);
}
/* Forward declaration. */
static int lj_cf_ffi_new(lua_State *L);
LJLIB_CF(ffi_meta___call) LJLIB_REC(cdata_call)
{
CTState *cts = ctype_cts(L);
GCcdata *cd = ffi_checkcdata(L, 1);
CTypeID id = cd->ctypeid;
CType *ct;
cTValue *tv;
MMS mm = MM_call;
if (cd->ctypeid == CTID_CTYPEID) {
id = *(CTypeID *)cdataptr(cd);
mm = MM_new;
} else {
int ret = lj_ccall_func(L, cd);
if (ret >= 0)
return ret;
}
/* Handle ctype __call/__new metamethod. */
ct = ctype_raw(cts, id);
if (ctype_isptr(ct->info)) id = ctype_cid(ct->info);
tv = lj_ctype_meta(cts, id, mm);
if (tv)
return lj_meta_tailcall(L, tv);
else if (mm == MM_call)
lj_err_callerv(L, LJ_ERR_FFI_BADCALL, strdata(lj_ctype_repr(L, id, NULL)));
return lj_cf_ffi_new(L);
}
LJLIB_CF(ffi_meta___add) LJLIB_REC(cdata_arith MM_add)
{
return ffi_arith(L);
}
LJLIB_CF(ffi_meta___sub) LJLIB_REC(cdata_arith MM_sub)
{
return ffi_arith(L);
}
LJLIB_CF(ffi_meta___mul) LJLIB_REC(cdata_arith MM_mul)
{
return ffi_arith(L);
}
LJLIB_CF(ffi_meta___div) LJLIB_REC(cdata_arith MM_div)
{
return ffi_arith(L);
}
LJLIB_CF(ffi_meta___mod) LJLIB_REC(cdata_arith MM_mod)
{
return ffi_arith(L);
}
LJLIB_CF(ffi_meta___pow) LJLIB_REC(cdata_arith MM_pow)
{
return ffi_arith(L);
}
LJLIB_CF(ffi_meta___unm) LJLIB_REC(cdata_arith MM_unm)
{
return ffi_arith(L);
}
/* End of contiguous ORDER MM. */
LJLIB_CF(ffi_meta___tostring)
{
GCcdata *cd = ffi_checkcdata(L, 1);
const char *msg = "cdata<%s>: %p";
CTypeID id = cd->ctypeid;
void *p = cdataptr(cd);
if (id == CTID_CTYPEID) {
msg = "ctype<%s>";
id = *(CTypeID *)p;
} else {
CTState *cts = ctype_cts(L);
CType *ct = ctype_raw(cts, id);
if (ctype_isref(ct->info)) {
p = *(void **)p;
ct = ctype_rawchild(cts, ct);
}
if (ctype_iscomplex(ct->info)) {
setstrV(L, L->top-1, lj_ctype_repr_complex(L, cdataptr(cd), ct->size));
goto checkgc;
} else if (ct->size == 8 && ctype_isinteger(ct->info)) {
setstrV(L, L->top-1, lj_ctype_repr_int64(L, *(uint64_t *)cdataptr(cd),
(ct->info & CTF_UNSIGNED)));
goto checkgc;
} else if (ctype_isfunc(ct->info)) {
p = *(void **)p;
} else if (ctype_isenum(ct->info)) {
msg = "cdata<%s>: %d";
p = (void *)(uintptr_t)*(uint32_t **)p;
} else {
if (ctype_isptr(ct->info)) {
p = cdata_getptr(p, ct->size);
ct = ctype_rawchild(cts, ct);
}
if (ctype_isstruct(ct->info) || ctype_isvector(ct->info)) {
/* Handle ctype __tostring metamethod. */
cTValue *tv = lj_ctype_meta(cts, ctype_typeid(cts, ct), MM_tostring);
if (tv)
return lj_meta_tailcall(L, tv);
}
}
}
lj_str_pushf(L, msg, strdata(lj_ctype_repr(L, id, NULL)), p);
checkgc:
lj_gc_check(L);
return 1;
}
static int ffi_pairs(lua_State *L, MMS mm)
{
CTState *cts = ctype_cts(L);
CTypeID id = ffi_checkcdata(L, 1)->ctypeid;
CType *ct = ctype_raw(cts, id);
cTValue *tv;
if (ctype_isptr(ct->info)) id = ctype_cid(ct->info);
tv = lj_ctype_meta(cts, id, mm);
if (!tv)
lj_err_callerv(L, LJ_ERR_FFI_BADMM, strdata(lj_ctype_repr(L, id, NULL)),
strdata(mmname_str(G(L), mm)));
return lj_meta_tailcall(L, tv);
}
LJLIB_CF(ffi_meta___pairs)
{
return ffi_pairs(L, MM_pairs);
}
LJLIB_CF(ffi_meta___ipairs)
{
return ffi_pairs(L, MM_ipairs);
}
LJLIB_PUSH("ffi") LJLIB_SET(__metatable)
#include "lj_libdef.h"
/* -- C library metamethods ----------------------------------------------- */
#define LJLIB_MODULE_ffi_clib
/* Index C library by a name. */
static TValue *ffi_clib_index(lua_State *L)
{
TValue *o = L->base;
CLibrary *cl;
if (!(o < L->top && tvisudata(o) && udataV(o)->udtype == UDTYPE_FFI_CLIB))
lj_err_argt(L, 1, LUA_TUSERDATA);
cl = (CLibrary *)uddata(udataV(o));
if (!(o+1 < L->top && tvisstr(o+1)))
lj_err_argt(L, 2, LUA_TSTRING);
return lj_clib_index(L, cl, strV(o+1));
}
LJLIB_CF(ffi_clib___index) LJLIB_REC(clib_index 1)
{
TValue *tv = ffi_clib_index(L);
if (tviscdata(tv)) {
CTState *cts = ctype_cts(L);
GCcdata *cd = cdataV(tv);
CType *s = ctype_get(cts, cd->ctypeid);
if (ctype_isextern(s->info)) {
CTypeID sid = ctype_cid(s->info);
void *sp = *(void **)cdataptr(cd);
CType *ct = ctype_raw(cts, sid);
if (lj_cconv_tv_ct(cts, ct, sid, L->top-1, sp))
lj_gc_check(L);
return 1;
}
}
copyTV(L, L->top-1, tv);
return 1;
}
LJLIB_CF(ffi_clib___newindex) LJLIB_REC(clib_index 0)
{
TValue *tv = ffi_clib_index(L);
TValue *o = L->base+2;
if (o < L->top && tviscdata(tv)) {
CTState *cts = ctype_cts(L);
GCcdata *cd = cdataV(tv);
CType *d = ctype_get(cts, cd->ctypeid);
if (ctype_isextern(d->info)) {
CTInfo qual = 0;
for (;;) { /* Skip attributes and collect qualifiers. */
d = ctype_child(cts, d);
if (!ctype_isattrib(d->info)) break;
if (ctype_attrib(d->info) == CTA_QUAL) qual |= d->size;
}
if (!((d->info|qual) & CTF_CONST)) {
lj_cconv_ct_tv(cts, d, *(void **)cdataptr(cd), o, 0);
return 0;
}
}
}
lj_err_caller(L, LJ_ERR_FFI_WRCONST);
return 0; /* unreachable */
}
LJLIB_CF(ffi_clib___gc)
{
TValue *o = L->base;
if (o < L->top && tvisudata(o) && udataV(o)->udtype == UDTYPE_FFI_CLIB)
lj_clib_unload((CLibrary *)uddata(udataV(o)));
return 0;
}
#include "lj_libdef.h"
/* -- Callback function metamethods --------------------------------------- */
#define LJLIB_MODULE_ffi_callback
static int ffi_callback_set(lua_State *L, GCfunc *fn)
{
GCcdata *cd = ffi_checkcdata(L, 1);
CTState *cts = ctype_cts(L);
CType *ct = ctype_raw(cts, cd->ctypeid);
if (ctype_isptr(ct->info) && (LJ_32 || ct->size == 8)) {
MSize slot = lj_ccallback_ptr2slot(cts, *(void **)cdataptr(cd));
if (slot < cts->cb.sizeid && cts->cb.cbid[slot] != 0) {
GCtab *t = cts->miscmap;
TValue *tv = lj_tab_setint(L, t, (int32_t)slot);
if (fn) {
setfuncV(L, tv, fn);
lj_gc_anybarriert(L, t);
} else {
setnilV(tv);
cts->cb.cbid[slot] = 0;
cts->cb.topid = slot < cts->cb.topid ? slot : cts->cb.topid;
}
return 0;
}
}
lj_err_caller(L, LJ_ERR_FFI_BADCBACK);
return 0;
}
LJLIB_CF(ffi_callback_free)
{
return ffi_callback_set(L, NULL);
}
LJLIB_CF(ffi_callback_set)
{
GCfunc *fn = lj_lib_checkfunc(L, 2);
return ffi_callback_set(L, fn);
}
LJLIB_PUSH(top-1) LJLIB_SET(__index)
#include "lj_libdef.h"
/* -- FFI library functions ----------------------------------------------- */
#define LJLIB_MODULE_ffi
LJLIB_CF(ffi_cdef)
{
GCstr *s = lj_lib_checkstr(L, 1);
CPState cp;
int errcode;
cp.L = L;
cp.cts = ctype_cts(L);
cp.srcname = strdata(s);
cp.p = strdata(s);
cp.param = L->base+1;
cp.mode = CPARSE_MODE_MULTI|CPARSE_MODE_DIRECT;
errcode = lj_cparse(&cp);
if (errcode) lj_err_throw(L, errcode); /* Propagate errors. */
lj_gc_check(L);
return 0;
}
LJLIB_CF(ffi_new) LJLIB_REC(.)
{
CTState *cts = ctype_cts(L);
CTypeID id = ffi_checkctype(L, cts, NULL);
CType *ct = ctype_raw(cts, id);
CTSize sz;
CTInfo info = lj_ctype_info(cts, id, &sz);
TValue *o = L->base+1;
GCcdata *cd;
if ((info & CTF_VLA)) {
o++;
sz = lj_ctype_vlsize(cts, ct, (CTSize)ffi_checkint(L, 2));
}
if (sz == CTSIZE_INVALID)
lj_err_arg(L, 1, LJ_ERR_FFI_INVSIZE);
if (!(info & CTF_VLA) && ctype_align(info) <= CT_MEMALIGN)
cd = lj_cdata_new(cts, id, sz);
else
cd = lj_cdata_newv(cts, id, sz, ctype_align(info));
setcdataV(L, o-1, cd); /* Anchor the uninitialized cdata. */
lj_cconv_ct_init(cts, ct, sz, cdataptr(cd),
o, (MSize)(L->top - o)); /* Initialize cdata. */
if (ctype_isstruct(ct->info)) {
/* Handle ctype __gc metamethod. Use the fast lookup here. */
cTValue *tv = lj_tab_getinth(cts->miscmap, -(int32_t)id);
if (tv && tvistab(tv) && (tv = lj_meta_fast(L, tabV(tv), MM_gc))) {
GCtab *t = cts->finalizer;
if (gcref(t->metatable)) {
/* Add to finalizer table, if still enabled. */
copyTV(L, lj_tab_set(L, t, o-1), tv);
lj_gc_anybarriert(L, t);
cd->marked |= LJ_GC_CDATA_FIN;
}
}
}
L->top = o; /* Only return the cdata itself. */
lj_gc_check(L);
return 1;
}
LJLIB_CF(ffi_cast) LJLIB_REC(ffi_new)
{
CTState *cts = ctype_cts(L);
CTypeID id = ffi_checkctype(L, cts, NULL);
CType *d = ctype_raw(cts, id);
TValue *o = lj_lib_checkany(L, 2);
L->top = o+1; /* Make sure this is the last item on the stack. */
if (!(ctype_isnum(d->info) || ctype_isptr(d->info) || ctype_isenum(d->info)))
lj_err_arg(L, 1, LJ_ERR_FFI_INVTYPE);
if (!(tviscdata(o) && cdataV(o)->ctypeid == id)) {
GCcdata *cd = lj_cdata_new(cts, id, d->size);
lj_cconv_ct_tv(cts, d, cdataptr(cd), o, CCF_CAST);
setcdataV(L, o, cd);
lj_gc_check(L);
}
return 1;
}
LJLIB_CF(ffi_typeof) LJLIB_REC(.)
{
CTState *cts = ctype_cts(L);
CTypeID id = ffi_checkctype(L, cts, L->base+1);
GCcdata *cd = lj_cdata_new(cts, CTID_CTYPEID, 4);
*(CTypeID *)cdataptr(cd) = id;
setcdataV(L, L->top-1, cd);
lj_gc_check(L);
return 1;
}
LJLIB_CF(ffi_istype) LJLIB_REC(.)
{
CTState *cts = ctype_cts(L);
CTypeID id1 = ffi_checkctype(L, cts, NULL);
TValue *o = lj_lib_checkany(L, 2);
int b = 0;
if (tviscdata(o)) {
GCcdata *cd = cdataV(o);
CTypeID id2 = cd->ctypeid == CTID_CTYPEID ? *(CTypeID *)cdataptr(cd) :
cd->ctypeid;
CType *ct1 = lj_ctype_rawref(cts, id1);
CType *ct2 = lj_ctype_rawref(cts, id2);
if (ct1 == ct2) {
b = 1;
} else if (ctype_type(ct1->info) == ctype_type(ct2->info) &&
ct1->size == ct2->size) {
if (ctype_ispointer(ct1->info))
b = lj_cconv_compatptr(cts, ct1, ct2, CCF_IGNQUAL);
else if (ctype_isnum(ct1->info) || ctype_isvoid(ct1->info))
b = (((ct1->info ^ ct2->info) & ~(CTF_QUAL|CTF_LONG)) == 0);
} else if (ctype_isstruct(ct1->info) && ctype_isptr(ct2->info) &&
ct1 == ctype_rawchild(cts, ct2)) {
b = 1;
}
}
setboolV(L->top-1, b);
setboolV(&G(L)->tmptv2, b); /* Remember for trace recorder. */
return 1;
}
LJLIB_CF(ffi_sizeof) LJLIB_REC(ffi_xof FF_ffi_sizeof)
{
CTState *cts = ctype_cts(L);
CTypeID id = ffi_checkctype(L, cts, NULL);
CTSize sz;
if (LJ_UNLIKELY(tviscdata(L->base) && cdataisv(cdataV(L->base)))) {
sz = cdatavlen(cdataV(L->base));
} else {
CType *ct = lj_ctype_rawref(cts, id);
if (ctype_isvltype(ct->info))
sz = lj_ctype_vlsize(cts, ct, (CTSize)ffi_checkint(L, 2));
else
sz = ctype_hassize(ct->info) ? ct->size : CTSIZE_INVALID;
if (LJ_UNLIKELY(sz == CTSIZE_INVALID)) {
setnilV(L->top-1);
return 1;
}
}
setintV(L->top-1, (int32_t)sz);
return 1;
}
LJLIB_CF(ffi_alignof) LJLIB_REC(ffi_xof FF_ffi_alignof)
{
CTState *cts = ctype_cts(L);
CTypeID id = ffi_checkctype(L, cts, NULL);
CTSize sz = 0;
CTInfo info = lj_ctype_info(cts, id, &sz);
setintV(L->top-1, 1 << ctype_align(info));
return 1;
}
LJLIB_CF(ffi_offsetof) LJLIB_REC(ffi_xof FF_ffi_offsetof)
{
CTState *cts = ctype_cts(L);
CTypeID id = ffi_checkctype(L, cts, NULL);
GCstr *name = lj_lib_checkstr(L, 2);
CType *ct = lj_ctype_rawref(cts, id);
CTSize ofs;
if (ctype_isstruct(ct->info) && ct->size != CTSIZE_INVALID) {
CType *fct = lj_ctype_getfield(cts, ct, name, &ofs);
if (fct) {
setintV(L->top-1, ofs);
if (ctype_isfield(fct->info)) {
return 1;
} else if (ctype_isbitfield(fct->info)) {
setintV(L->top++, ctype_bitpos(fct->info));
setintV(L->top++, ctype_bitbsz(fct->info));
return 3;
}
}
}
return 0;
}
LJLIB_CF(ffi_errno) LJLIB_REC(.)
{
int err = errno;
if (L->top > L->base)
errno = ffi_checkint(L, 1);
setintV(L->top++, err);
return 1;
}
LJLIB_CF(ffi_string) LJLIB_REC(.)
{
CTState *cts = ctype_cts(L);
TValue *o = lj_lib_checkany(L, 1);
const char *p;
size_t len;
if (o+1 < L->top && !tvisnil(o+1)) {
len = (size_t)ffi_checkint(L, 2);
lj_cconv_ct_tv(cts, ctype_get(cts, CTID_P_CVOID), (uint8_t *)&p, o,
CCF_ARG(1));
} else {
lj_cconv_ct_tv(cts, ctype_get(cts, CTID_P_CCHAR), (uint8_t *)&p, o,
CCF_ARG(1));
len = strlen(p);
}
L->top = o+1; /* Make sure this is the last item on the stack. */
setstrV(L, o, lj_str_new(L, p, len));
lj_gc_check(L);
return 1;
}
LJLIB_CF(ffi_copy) LJLIB_REC(.)
{
void *dp = ffi_checkptr(L, 1, CTID_P_VOID);
void *sp = ffi_checkptr(L, 2, CTID_P_CVOID);
TValue *o = L->base+1;
CTSize len;
if (tvisstr(o) && o+1 >= L->top)
len = strV(o)->len+1; /* Copy Lua string including trailing '\0'. */
else
len = (CTSize)ffi_checkint(L, 3);
memcpy(dp, sp, len);
return 0;
}
LJLIB_CF(ffi_fill) LJLIB_REC(.)
{
void *dp = ffi_checkptr(L, 1, CTID_P_VOID);
CTSize len = (CTSize)ffi_checkint(L, 2);
int32_t fill = 0;
if (L->base+2 < L->top && !tvisnil(L->base+2)) fill = ffi_checkint(L, 3);
memset(dp, fill, len);
return 0;
}
#define H_(le, be) LJ_ENDIAN_SELECT(0x##le, 0x##be)
/* Test ABI string. */
LJLIB_CF(ffi_abi) LJLIB_REC(.)
{
GCstr *s = lj_lib_checkstr(L, 1);
int b = 0;
switch (s->hash) {
#if LJ_64
case H_(849858eb,ad35fd06): b = 1; break; /* 64bit */
#else
case H_(662d3c79,d0e22477): b = 1; break; /* 32bit */
#endif
#if LJ_ARCH_HASFPU
case H_(e33ee463,e33ee463): b = 1; break; /* fpu */
#endif
#if LJ_ABI_SOFTFP
case H_(61211a23,c2e8c81c): b = 1; break; /* softfp */
#else
case H_(539417a8,8ce0812f): b = 1; break; /* hardfp */
#endif
#if LJ_ABI_EABI
case H_(2182df8f,f2ed1152): b = 1; break; /* eabi */
#endif
#if LJ_ABI_WIN
case H_(4ab624a8,4ab624a8): b = 1; break; /* win */
#endif
case H_(3af93066,1f001464): b = 1; break; /* le/be */
default:
break;
}
setboolV(L->top-1, b);
setboolV(&G(L)->tmptv2, b); /* Remember for trace recorder. */
return 1;
}
#undef H_
LJLIB_PUSH(top-8) LJLIB_SET(!) /* Store reference to miscmap table. */
LJLIB_CF(ffi_metatype)
{
CTState *cts = ctype_cts(L);
CTypeID id = ffi_checkctype(L, cts, NULL);
GCtab *mt = lj_lib_checktab(L, 2);
GCtab *t = cts->miscmap;
CType *ct = ctype_get(cts, id); /* Only allow raw types. */
TValue *tv;
GCcdata *cd;
if (!(ctype_isstruct(ct->info) || ctype_iscomplex(ct->info) ||
ctype_isvector(ct->info)))
lj_err_arg(L, 1, LJ_ERR_FFI_INVTYPE);
tv = lj_tab_setinth(L, t, -(int32_t)id);
if (!tvisnil(tv))
lj_err_caller(L, LJ_ERR_PROTMT);
settabV(L, tv, mt);
lj_gc_anybarriert(L, t);
cd = lj_cdata_new(cts, CTID_CTYPEID, 4);
*(CTypeID *)cdataptr(cd) = id;
setcdataV(L, L->top-1, cd);
lj_gc_check(L);
return 1;
}
LJLIB_PUSH(top-7) LJLIB_SET(!) /* Store reference to finalizer table. */
LJLIB_CF(ffi_gc) LJLIB_REC(.)
{
GCcdata *cd = ffi_checkcdata(L, 1);
TValue *fin = lj_lib_checkany(L, 2);
CTState *cts = ctype_cts(L);
GCtab *t = cts->finalizer;
CType *ct = ctype_raw(cts, cd->ctypeid);
if (!(ctype_isptr(ct->info) || ctype_isstruct(ct->info) ||
ctype_isrefarray(ct->info)))
lj_err_arg(L, 1, LJ_ERR_FFI_INVTYPE);
if (gcref(t->metatable)) { /* Update finalizer table, if still enabled. */
copyTV(L, lj_tab_set(L, t, L->base), fin);
lj_gc_anybarriert(L, t);
if (!tvisnil(fin))
cd->marked |= LJ_GC_CDATA_FIN;
else
cd->marked &= ~LJ_GC_CDATA_FIN;
}
L->top = L->base+1; /* Pass through the cdata object. */
return 1;
}
LJLIB_PUSH(top-5) LJLIB_SET(!) /* Store clib metatable in func environment. */
LJLIB_CF(ffi_load)
{
GCstr *name = lj_lib_checkstr(L, 1);
int global = (L->base+1 < L->top && tvistruecond(L->base+1));
lj_clib_load(L, tabref(curr_func(L)->c.env), name, global);
return 1;
}
LJLIB_PUSH(top-4) LJLIB_SET(C)
LJLIB_PUSH(top-3) LJLIB_SET(os)
LJLIB_PUSH(top-2) LJLIB_SET(arch)
#include "lj_libdef.h"
/* ------------------------------------------------------------------------ */
/* Create special weak-keyed finalizer table. */
static GCtab *ffi_finalizer(lua_State *L)
{
/* NOBARRIER: The table is new (marked white). */
GCtab *t = lj_tab_new(L, 0, 1);
settabV(L, L->top++, t);
setgcref(t->metatable, obj2gco(t));
setstrV(L, lj_tab_setstr(L, t, lj_str_newlit(L, "__mode")),
lj_str_newlit(L, "k"));
t->nomm = (uint8_t)(~(1u<<MM_mode));
return t;
}
/* Register FFI module as loaded. */
static void ffi_register_module(lua_State *L)
{
cTValue *tmp = lj_tab_getstr(tabV(registry(L)), lj_str_newlit(L, "_LOADED"));
if (tmp && tvistab(tmp)) {
GCtab *t = tabV(tmp);
copyTV(L, lj_tab_setstr(L, t, lj_str_newlit(L, LUA_FFILIBNAME)), L->top-1);
lj_gc_anybarriert(L, t);
}
}
LUALIB_API int luaopen_ffi(lua_State *L)
{
CTState *cts = lj_ctype_init(L);
settabV(L, L->top++, (cts->miscmap = lj_tab_new(L, 0, 1)));
cts->finalizer = ffi_finalizer(L);
LJ_LIB_REG(L, NULL, ffi_meta);
/* NOBARRIER: basemt is a GC root. */
setgcref(basemt_it(G(L), LJ_TCDATA), obj2gco(tabV(L->top-1)));
LJ_LIB_REG(L, NULL, ffi_clib);
LJ_LIB_REG(L, NULL, ffi_callback);
/* NOBARRIER: the key is new and lj_tab_newkey() handles the barrier. */
settabV(L, lj_tab_setstr(L, cts->miscmap, &cts->g->strempty), tabV(L->top-1));
L->top--;
lj_clib_default(L, tabV(L->top-1)); /* Create ffi.C default namespace. */
lua_pushliteral(L, LJ_OS_NAME);
lua_pushliteral(L, LJ_ARCH_NAME);
LJ_LIB_REG(L, NULL, ffi); /* Note: no global "ffi" created! */
ffi_register_module(L);
return 1;
}
#endif
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