diff options
Diffstat (limited to 'lib/runtime_tools/src/dyntrace.erl')
| -rw-r--r-- | lib/runtime_tools/src/dyntrace.erl | 55 |
1 files changed, 9 insertions, 46 deletions
diff --git a/lib/runtime_tools/src/dyntrace.erl b/lib/runtime_tools/src/dyntrace.erl index 388c7679b9..3146a44350 100644 --- a/lib/runtime_tools/src/dyntrace.erl +++ b/lib/runtime_tools/src/dyntrace.erl @@ -6,23 +6,22 @@ %%% work on any operating system platform where user-space DTrace/Systemtap %%% (and in the future LttNG UST) probes are supported. %%% -%%% Use the `dyntrace:init()' function to load the NIF shared library and -%%% to initialize library's private state. -%%% %%% It is recommended that you use the `dyntrace:p()' function to add %%% Dynamic trace probes to your Erlang code. This function can accept up to %%% four integer arguments and four string arguments; the integer -%%% argument(s) must come before any string argument. For example: +%%% argument(s) must come before any string argument. +%%% +%%% If using DTrace, enable the dynamic trace probe using the 'dtrace' +%%% command, for example: +%%% +%%% dtrace -s /your/path/to/lib/runtime_tools-1.8.7/examples/user-probe.d +%%% +%%% Then, back at the Erlang shell, try this example: %%% ``` %%% 1> dyntrace:put_tag("GGOOOAAALL!!!!!"). %%% true -%%% 2> dyntrace:init(). -%%% ok -%%% -%%% % % % If using dtrace, enable the Dynamic trace probe using the 'dtrace' -%%% % % % command. %%% -%%% 3> dyntrace:p(7, 8, 9, "one", "four"). +%%% 2> dyntrace:p(7, 8, 9, "one", "four"). %%% true %%% ''' %%% @@ -41,7 +40,6 @@ p/0, p/1, p/2, p/3, p/4, p/5, p/6, p/7, p/8]). -export([put_tag/1, get_tag/0, get_tag_data/0, spread_tag/1, restore_tag/1]). --export([scaff/0]). % Development only -export([user_trace_i4s4/9]). % Know what you're doing! -on_load(on_load/0). @@ -242,38 +240,3 @@ restore_tag(T) -> erlang:dt_restore_tag(T). -%% Scaffolding to write tedious code: quick brute force and not 100% correct. - -scaff_int_args(N) -> - L = lists:sublist(["I1", "I2", "I3", "I4"], N), - [string:join(L, ", ")]. - -scaff_int_guards(N) -> - L = lists:sublist(["is_integer(I1)", "is_integer(I2)", "is_integer(I3)", - "is_integer(I4)"], N), - lists:flatten(string:join(L, ", ")). - -scaff_char_args(N) -> - L = lists:sublist(["S1", "S2", "S3", "S4"], N), - [string:join(L, ", ")]. - -scaff_fill(N) -> - [string:join(lists:duplicate(N, "undef"), ", ")]. - -scaff() -> - L = [begin - IntArgs = scaff_int_args(N_int), - IntGuards = scaff_int_guards(N_int), - IntFill = scaff_fill(4 - N_int), - CharArgs = scaff_char_args(N_char), - CharFill = scaff_fill(4 - N_char), - InArgs = string:join(IntArgs ++ CharArgs, ", "), - OutArgs = string:join(IntArgs ++ IntFill ++ CharArgs ++ CharFill, - ", "), - {N_int + N_char, - lists:flatten([io_lib:format("p(~s) when ~s ->\n", - [InArgs, IntGuards]), - io_lib:format(" user_trace_int(~s);\n", [OutArgs]) - ])} - end || N_int <- [0,1,2,3,4], N_char <- [0,1,2,3,4]], - [io:format("%%~p\n~s", [N, Str]) || {N, Str} <- lists:sort(L)]. |