diff options
Diffstat (limited to 'erts/emulator/beam/erl_db_util.c')
| -rw-r--r-- | erts/emulator/beam/erl_db_util.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/erts/emulator/beam/erl_db_util.c b/erts/emulator/beam/erl_db_util.c index a78623f490..957762d4b0 100644 --- a/erts/emulator/beam/erl_db_util.c +++ b/erts/emulator/beam/erl_db_util.c @@ -497,6 +497,7 @@ static erts_atomic32_t trace_control_word; /* This needs to be here, before the bif table... */ static Eterm db_set_trace_control_word_fake_1(BIF_ALIST_1); +static Eterm db_length_1(BIF_ALIST_1); /* ** The table of callable bif's, i e guard bif's and @@ -603,7 +604,7 @@ static DMCGuardBif guard_tab[] = }, { am_length, - &length_1, + &db_length_1, 1, DBIF_ALL }, @@ -971,6 +972,26 @@ BIF_RETTYPE db_set_trace_control_word_1(BIF_ALIST_1) BIF_RET(db_set_trace_control_word(BIF_P, BIF_ARG_1)); } +/* + * Implementation of length/1 for match specs (non-trapping). + */ +static Eterm db_length_1(BIF_ALIST_1) +{ + Eterm list; + Uint i; + + list = BIF_ARG_1; + i = 0; + while (is_list(list)) { + i++; + list = CDR(list_val(list)); + } + if (is_not_nil(list)) { + BIF_ERROR(BIF_P, BADARG); + } + BIF_RET(make_small(i)); +} + static Eterm db_set_trace_control_word_fake_1(BIF_ALIST_1) { Process *p = BIF_P; |