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| author | John Högberg <[email protected]> | 2018-02-26 16:27:39 +0100 |
|---|---|---|
| committer | John Högberg <[email protected]> | 2018-02-26 17:47:07 +0100 |
| commit | 2627297ad239697c7df297b8fde35f9827fa962f (patch) | |
| tree | 524ecae6919dfd8316a0066eba7f0d466513ba40 /lib/stdlib | |
| parent | 7914843737e490c49b0918b67a093e68415b3beb (diff) | |
| download | otp-2627297ad239697c7df297b8fde35f9827fa962f.tar.gz otp-2627297ad239697c7df297b8fde35f9827fa962f.tar.bz2 otp-2627297ad239697c7df297b8fde35f9827fa962f.zip | |
Replace binary:bin_to_list CIF implementation with binary_to_list
binary:bin_to_list had a poor implementation that resulted in
excessive garbage collection. binary_to_list is almost identical and
has a generally better implementation, so I've replaced
binary:bin_to_list's CIF with a thin wrapper around binary_to_list.
Granted, binary_to_list has a deprecated indexing scheme, but we're
unlikely to ever remote it entirely and it's somewhat easy to move
it to the 'binary' module later on.
Diffstat (limited to 'lib/stdlib')
| -rw-r--r-- | lib/stdlib/src/binary.erl | 28 |
1 files changed, 22 insertions, 6 deletions
diff --git a/lib/stdlib/src/binary.erl b/lib/stdlib/src/binary.erl index 6a64133b45..7d0e42489e 100644 --- a/lib/stdlib/src/binary.erl +++ b/lib/stdlib/src/binary.erl @@ -47,23 +47,39 @@ at(_, _) -> -spec bin_to_list(Subject) -> [byte()] when Subject :: binary(). -bin_to_list(_) -> - erlang:nif_error(undef). +bin_to_list(Subject) -> + binary_to_list(Subject). -spec bin_to_list(Subject, PosLen) -> [byte()] when Subject :: binary(), PosLen :: part(). -bin_to_list(_, _) -> - erlang:nif_error(undef). +bin_to_list(Subject, {Pos, Len}) -> + bin_to_list(Subject, Pos, Len); +bin_to_list(_Subject, _BadArg) -> + erlang:error(badarg). -spec bin_to_list(Subject, Pos, Len) -> [byte()] when Subject :: binary(), Pos :: non_neg_integer(), Len :: integer(). -bin_to_list(_, _, _) -> - erlang:nif_error(undef). +bin_to_list(Subject, Pos, Len) when not is_binary(Subject); + not is_integer(Pos); + not is_integer(Len) -> + %% binary_to_list/3 allows bitstrings as long as the slice fits, and we + %% want to badarg when Pos/Len aren't integers instead of raising badarith + %% when adjusting args for binary_to_list/3. + erlang:error(badarg); +bin_to_list(Subject, Pos, 0) when Pos >= 0, Pos =< byte_size(Subject) -> + %% binary_to_list/3 doesn't handle this case. + []; +bin_to_list(_Subject, _Pos, 0) -> + erlang:error(badarg); +bin_to_list(Subject, Pos, Len) when Len < 0 -> + bin_to_list(Subject, Pos + Len, -Len); +bin_to_list(Subject, Pos, Len) when Len > 0 -> + binary_to_list(Subject, Pos + 1, Pos + Len). -spec compile_pattern(Pattern) -> cp() when Pattern :: binary() | [binary()]. |