/* Error in context of caller. */
LJ_NOINLINE void lj_err_callermsg(lua_State *L, const char *msg)
{
TValue *frame = L->base-1;
TValue *pframe = NULL;
if (frame_islua(frame)) {
pframe = frame_prevl(frame);
} else if (frame_iscont(frame)) {
#if LJ_HASFFI
if ((frame-1)->u32.lo == LJ_CONT_FFI_CALLBACK) {
pframe = frame;
frame = NULL;
} else
#endif
{
pframe = frame_prevd(frame);
#if LJ_HASFFI
/* Remove frame for FFI metamethods. */
if (frame_func(frame)->c.ffid >= FF_ffi_meta___index &&
frame_func(frame)->c.ffid <= FF_ffi_meta___tostring) {
L->base = pframe+1;
L->top = frame;
setcframe_pc(cframe_raw(L->cframe), frame_contpc(frame));
}
#endif
}
}
lj_debug_addloc(L, msg, pframe, frame);
lj_err_run(L);
}
/* Add frame links at the end of the snapshot. */
static BCReg snapshot_framelinks(jit_State *J, SnapEntry *map)
{
cTValue *frame = J->L->base - 1;
cTValue *lim = J->L->base - J->baseslot;
GCfunc *fn = frame_func(frame);
cTValue *ftop = isluafunc(fn) ? (frame+funcproto(fn)->framesize) : J->L->top;
MSize f = 0;
lua_assert(!LJ_FR2); /* TODO_FR2: store 64 bit PCs. */
map[f++] = SNAP_MKPC(J->pc); /* The current PC is always the first entry. */
while (frame > lim) { /* Backwards traversal of all frames above base. */
if (frame_islua(frame)) {
map[f++] = SNAP_MKPC(frame_pc(frame));
frame = frame_prevl(frame);
} else if (frame_iscont(frame)) {
map[f++] = SNAP_MKFTSZ(frame_ftsz(frame));
map[f++] = SNAP_MKPC(frame_contpc(frame));
frame = frame_prevd(frame);
} else {
lua_assert(!frame_isc(frame));
map[f++] = SNAP_MKFTSZ(frame_ftsz(frame));
frame = frame_prevd(frame);
continue;
}
if (frame + funcproto(frame_func(frame))->framesize > ftop)
ftop = frame + funcproto(frame_func(frame))->framesize;
}
lua_assert(f == (MSize)(1 + J->framedepth));
return (BCReg)(ftop - lim);
}
/* Error in context of caller. */
LJ_NOINLINE void lj_err_callermsg(lua_State *L, const char *msg)
{
TValue *frame = L->base-1;
TValue *pframe = NULL;
if (frame_islua(frame)) {
pframe = frame_prevl(frame);
} else if (frame_iscont(frame)) {
pframe = frame_prevd(frame);
#if LJ_HASFFI
/* Remove frame for FFI metamethods. */
if (frame_func(frame)->c.ffid >= FF_ffi_meta___index &&
frame_func(frame)->c.ffid <= FF_ffi_meta___tostring) {
L->base = pframe+1;
L->top = frame;
}
#endif
}
lj_debug_addloc(L, msg, pframe, frame);
lj_err_run(L);
}
/* Find error function for runtime errors. Requires an extra stack traversal. */
static ptrdiff_t finderrfunc(lua_State *L)
{
cTValue *frame = L->base-1, *bot = tvref(L->stack)+LJ_FR2;
void *cf = L->cframe;
while (frame > bot && cf) {
while (cframe_nres(cframe_raw(cf)) < 0) { /* cframe without frame? */
if (frame >= restorestack(L, -cframe_nres(cf)))
break;
if (cframe_errfunc(cf) >= 0) /* Error handler not inherited (-1)? */
return cframe_errfunc(cf);
cf = cframe_prev(cf); /* Else unwind cframe and continue searching. */
if (cf == NULL)
return 0;
}
switch (frame_typep(frame)) {
case FRAME_LUA:
case FRAME_LUAP:
frame = frame_prevl(frame);
break;
case FRAME_C:
cf = cframe_prev(cf);
/* fallthrough */
case FRAME_VARG:
frame = frame_prevd(frame);
break;
case FRAME_CONT:
if (frame_iscont_fficb(frame))
cf = cframe_prev(cf);
frame = frame_prevd(frame);
break;
case FRAME_CP:
if (cframe_canyield(cf)) return 0;
if (cframe_errfunc(cf) >= 0)
return cframe_errfunc(cf);
frame = frame_prevd(frame);
break;
case FRAME_PCALL:
case FRAME_PCALLH:
if (frame_func(frame_prevd(frame))->c.ffid == FF_xpcall)
return savestack(L, frame_prevd(frame)+1); /* xpcall's errorfunc. */
return 0;
default:
lua_assert(0);
return 0;
}
}
return 0;
}
