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-rw-r--r--erts/doc/src/erlang.xml20
-rw-r--r--erts/preloaded/src/erlang.erl3
-rw-r--r--erts/preloaded/src/erts_internal.erl3
-rw-r--r--lib/dialyzer/test/small_SUITE_data/src/ms.erl8
4 files changed, 32 insertions, 2 deletions
diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml
index b0d25389fd..9646953518 100644
--- a/erts/doc/src/erlang.xml
+++ b/erts/doc/src/erlang.xml
@@ -9529,6 +9529,10 @@ timestamp() ->
<type name="trace_info_item_result"/>
<type name="trace_info_flag"/>
<type name="trace_match_spec"/>
+ <type name="match_variable"/>
+ <type_desc name="match_variable">
+ Approximation of '$1' | '$2' | '$3' | ...
+ </type_desc>
<desc>
<p>Returns trace information about a port, process, function, or
event.</p>
@@ -9660,6 +9664,10 @@ timestamp() ->
</fsummary>
<type name="trace_pattern_mfa"/>
<type name="trace_match_spec"/>
+ <type_desc name="match_variable">
+ Approximation of '$1' | '$2' | '$3' | ...
+ </type_desc>
+ <type name="match_variable"/>
<desc>
<p>The same as
<seealso marker="#trace_pattern/3">
@@ -9672,6 +9680,10 @@ timestamp() ->
<name name="trace_pattern" arity="3" clause_i="1"/>
<fsummary>Set trace pattern for message sending.</fsummary>
<type name="trace_match_spec"/>
+ <type name="match_variable"/>
+ <type_desc name="match_variable">
+ Approximation of '$1' | '$2' | '$3' | ...
+ </type_desc>
<desc>
<p>Sets trace pattern for <em>message sending</em>.
Must be combined with
@@ -9739,6 +9751,10 @@ timestamp() ->
<name name="trace_pattern" arity="3" clause_i="2"/>
<fsummary>Set trace pattern for tracing of message receiving.</fsummary>
<type name="trace_match_spec"/>
+ <type name="match_variable"/>
+ <type_desc name="match_variable">
+ Approximation of '$1' | '$2' | '$3' | ...
+ </type_desc>
<desc>
<p>Sets trace pattern for <em>message receiving</em>.
Must be combined with
@@ -9809,6 +9825,10 @@ timestamp() ->
<type name="trace_pattern_mfa"/>
<type name="trace_match_spec"/>
<type name="trace_pattern_flag"/>
+ <type name="match_variable"/>
+ <type_desc name="match_variable">
+ Approximation of '$1' | '$2' | '$3' | ...
+ </type_desc>
<desc>
<p>Enables or disables <em>call tracing</em> for one or more functions.
Must be combined with
diff --git a/erts/preloaded/src/erlang.erl b/erts/preloaded/src/erlang.erl
index 652a954807..8771089b65 100644
--- a/erts/preloaded/src/erlang.erl
+++ b/erts/preloaded/src/erlang.erl
@@ -2408,10 +2408,11 @@ term_to_binary(_Term, _Options) ->
tl(_List) ->
erlang:nif_error(undefined).
+-type match_variable() :: atom(). % Approximation of '$1' | '$2' | ...
-type trace_pattern_mfa() ::
{atom(),atom(),arity() | '_'} | on_load.
-type trace_match_spec() ::
- [{[term()] | '_' ,[term()],[term()]}].
+ [{[term()] | '_' | match_variable() ,[term()],[term()]}].
-spec erlang:trace_pattern(MFA, MatchSpec) -> non_neg_integer() when
MFA :: trace_pattern_mfa() | send | 'receive',
diff --git a/erts/preloaded/src/erts_internal.erl b/erts/preloaded/src/erts_internal.erl
index 6aae5ba38c..f4518c4008 100644
--- a/erts/preloaded/src/erts_internal.erl
+++ b/erts/preloaded/src/erts_internal.erl
@@ -438,10 +438,11 @@ microstate_accounting(Ref, Threads) ->
trace(_PidSpec, _How, _FlagList) ->
erlang:nif_error(undefined).
+-type match_variable() :: atom(). % Approximation of '$1' | '$2' | ...
-type trace_pattern_mfa() ::
{atom(),atom(),arity() | '_'} | on_load.
-type trace_match_spec() ::
- [{[term()] | '_' ,[term()],[term()]}].
+ [{[term()] | '_' | match_variable() ,[term()],[term()]}].
-spec trace_pattern(MFA, MatchSpec, FlagList) -> non_neg_integer() when
MFA :: trace_pattern_mfa(),
diff --git a/lib/dialyzer/test/small_SUITE_data/src/ms.erl b/lib/dialyzer/test/small_SUITE_data/src/ms.erl
new file mode 100644
index 0000000000..47a5e886cf
--- /dev/null
+++ b/lib/dialyzer/test/small_SUITE_data/src/ms.erl
@@ -0,0 +1,8 @@
+-module(ms).
+-export([t/0]).
+
+-include_lib("stdlib/include/ms_transform.hrl").
+
+t() ->
+ MS = dbg:fun2ms(fun(All) -> message(All) end),
+ erlang:trace_pattern({m, f, '_'}, MS).