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-rw-r--r--erts/emulator/beam/erl_nif.c12
-rw-r--r--erts/emulator/test/nif_SUITE.erl17
-rw-r--r--erts/emulator/test/nif_SUITE_data/nif_SUITE.c21
-rw-r--r--system/doc/efficiency_guide/binaryhandling.xml7
4 files changed, 54 insertions, 3 deletions
diff --git a/erts/emulator/beam/erl_nif.c b/erts/emulator/beam/erl_nif.c
index 1414744763..1caea6dcf8 100644
--- a/erts/emulator/beam/erl_nif.c
+++ b/erts/emulator/beam/erl_nif.c
@@ -472,6 +472,18 @@ int enif_inspect_binary(ErlNifEnv* env, Eterm bin_term, ErlNifBinary* bin)
struct enif_tmp_obj_t* tmp;
byte* raw_ptr;
}u;
+
+ if (is_boxed(bin_term) && *binary_val(bin_term) == HEADER_SUB_BIN) {
+ ErlSubBin* sb = (ErlSubBin*) binary_val(bin_term);
+ if (sb->is_writable) {
+ ProcBin* pb = (ProcBin*) binary_val(sb->orig);
+ ASSERT(pb->thing_word == HEADER_PROC_BIN);
+ if (pb->flags) {
+ erts_emasculate_writable_binary(pb);
+ sb->is_writable = 0;
+ }
+ }
+ }
u.tmp = NULL;
bin->data = erts_get_aligned_binary_bytes_extra(bin_term, &u.raw_ptr, allocator,
sizeof(struct enif_tmp_obj_t));
diff --git a/erts/emulator/test/nif_SUITE.erl b/erts/emulator/test/nif_SUITE.erl
index 01ee71c4fa..14e6585220 100644
--- a/erts/emulator/test/nif_SUITE.erl
+++ b/erts/emulator/test/nif_SUITE.erl
@@ -37,6 +37,7 @@
threading/1, send/1, send2/1, send3/1, send_threaded/1, neg/1,
is_checks/1,
get_length/1, make_atom/1, make_string/1, reverse_list_test/1,
+ otp_9828/1,
otp_9668/1, consume_timeslice/1, dirty_nif/1, dirty_nif_send/1,
dirty_nif_exception/1, nif_schedule/1
]).
@@ -65,6 +66,7 @@ all() ->
resource_takeover, threading, send, send2, send3,
send_threaded, neg, is_checks, get_length, make_atom,
make_string,reverse_list_test,
+ otp_9828,
otp_9668, consume_timeslice,
nif_schedule, dirty_nif, dirty_nif_send, dirty_nif_exception
].
@@ -1442,6 +1444,20 @@ otp_9668(Config) ->
?line verify_tmpmem(TmpMem),
ok.
+otp_9828(doc) -> ["Copy of writable binary"];
+otp_9828(Config) ->
+ ensure_lib_loaded(Config, 1),
+
+ otp_9828_loop(<<"I'm alive!">>, 1000).
+
+otp_9828_loop(Bin, 0) ->
+ ok;
+otp_9828_loop(Bin, Val) ->
+ WrtBin = <<Bin/binary, Val:32>>,
+ ok = otp_9828_nif(WrtBin),
+ otp_9828_loop(WrtBin, Val-1).
+
+
consume_timeslice(Config) when is_list(Config) ->
CONTEXT_REDS = 2000,
Me = self(),
@@ -1718,6 +1734,7 @@ reverse_list(_) -> ?nif_stub.
echo_int(_) -> ?nif_stub.
type_sizes() -> ?nif_stub.
otp_9668_nif(_) -> ?nif_stub.
+otp_9828_nif(_) -> ?nif_stub.
consume_timeslice_nif(_,_) -> ?nif_stub.
call_nif_schedule(_,_) -> ?nif_stub.
call_dirty_nif(_,_,_) -> ?nif_stub.
diff --git a/erts/emulator/test/nif_SUITE_data/nif_SUITE.c b/erts/emulator/test/nif_SUITE_data/nif_SUITE.c
index ad9d5d9254..ff5fb8c5af 100644
--- a/erts/emulator/test/nif_SUITE_data/nif_SUITE.c
+++ b/erts/emulator/test/nif_SUITE_data/nif_SUITE.c
@@ -1473,6 +1473,26 @@ static ERL_NIF_TERM otp_9668_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM ar
return atom_ok;
}
+static ERL_NIF_TERM otp_9828_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{
+ /* copy a writable binary could reallocate it due to "emasculation"
+ and thereby render a previous inspection invalid.
+ */
+ ErlNifBinary bin1;
+ ErlNifEnv* myenv;
+
+ if (!enif_inspect_binary(env, argv[0], &bin1)) {
+ return enif_make_badarg(env);
+ }
+
+ myenv = enif_alloc_env();
+ enif_make_copy(myenv, argv[0]);
+ enif_free_env(myenv);
+
+ return memcmp(bin1.data, "I'm alive!", 10)==0 ? atom_ok : atom_false;
+}
+
+
static ERL_NIF_TERM consume_timeslice_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
int percent;
@@ -1772,6 +1792,7 @@ static ErlNifFunc nif_funcs[] =
{"echo_int", 1, echo_int},
{"type_sizes", 0, type_sizes},
{"otp_9668_nif", 1, otp_9668_nif},
+ {"otp_9828_nif", 1, otp_9828_nif},
{"consume_timeslice_nif", 2, consume_timeslice_nif},
{"call_nif_schedule", 2, call_nif_schedule},
#ifdef ERL_NIF_DIRTY_SCHEDULER_SUPPORT
diff --git a/system/doc/efficiency_guide/binaryhandling.xml b/system/doc/efficiency_guide/binaryhandling.xml
index 6b0df49011..4ba1378059 100644
--- a/system/doc/efficiency_guide/binaryhandling.xml
+++ b/system/doc/efficiency_guide/binaryhandling.xml
@@ -5,7 +5,7 @@
<header>
<copyright>
<year>2007</year>
- <year>2013</year>
+ <year>2014</year>
<holder>Ericsson AB, All Rights Reserved</holder>
</copyright>
<legalnotice>
@@ -237,8 +237,9 @@ Bin = <<Bin1,...>> %% Bin1 will be COPIED
<p><c>Bin1</c> will be copied in the third line.</p>
<p>The same thing happens if you insert a binary into an <em>ets</em>
- table or send it to a port using <c>erlang:port_command/2</c>.</p>
-
+ table or send it to a port using <c>erlang:port_command/2</c> or pass it to
+ <seealso marker="erts:erl_nif#enif_inspect_binary">enif_inspect_binary</seealso>
+ in a NIF.</p>
<p>Matching a binary will also cause it to shrink and the next append
operation will copy the binary data:</p>