/* 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); 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 LJ_HASFFI if ((frame-1)->u32.lo == LJ_CONT_FFI_CALLBACK) cf = cframe_prev(cf); #endif 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_ftsz(frame) >= (ptrdiff_t)(2*sizeof(TValue))) /* xpcall? */ return savestack(L, frame-1); /* Point to xpcall's errorfunc. */ return 0; default: lua_assert(0); return 0; } } return 0; }
/* 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; }
static TValue *cpparser(lua_State *L, lua_CFunction dummy, void *ud) { LexState *ls = (LexState *)ud; GCproto *pt; GCfunc *fn; int bc; UNUSED(dummy); cframe_errfunc(L->cframe) = -1; /* Inherit error function. */ bc = lj_lex_setup(L, ls); if (ls->mode && !strchr(ls->mode, bc ? 'b' : 't')) { setstrV(L, L->top++, lj_err_str(L, LJ_ERR_XMODE)); lj_err_throw(L, LUA_ERRSYNTAX); } pt = bc ? lj_bcread(ls) : lj_parse(ls); fn = lj_func_newL_empty(L, pt, tabref(L->env)); /* Don't combine above/below into one statement. */ setfuncV(L, L->top++, fn); return NULL; }