nietaki
commented
6 years ago Here's some preliminary research on what the print function gets:
iex(2)> pf = fn(t) ->
...(2)> IO.puts "term:"
...(2)> IO.inspect t
...(2)> end
#Function<6.118419387/1 in :erl_eval.expr/5>
iex(3)> opts = [print_fun: pf]
iex(4)> Rexbug.start("URI.parse/1", opts)
{82, 1}
iex(5)> URI.parse("https://example.com")
term:
{:call, {{URI, :parse, ["https://example.com"]}, ""},
{#PID<0.150.0>, {IEx.Evaluator, :init, 4}}, {21, 49, 20, 152927}}
%URI{authority: "example.com", fragment: nil, host: "example.com", path: nil,
port: 443, query: nil, scheme: "https", userinfo: nil}
redbug done, timeout - 1
iex(7)> Rexbug.start("URI.parse/1 :: return", opts)
{82, 1}
iex(8)> URI.parse("https://example.com")
term:
{:call, {{URI, :parse, ["https://example.com"]}, ""},
{#PID<0.150.0>, {IEx.Evaluator, :init, 4}}, {21, 50, 9, 106586}}
%URI{authority: "example.com", fragment: nil, host: "example.com", path: nil,
port: 443, query: nil, scheme: "https", userinfo: nil}
term:
{:retn,
{{URI, :parse, 1},
%URI{authority: "example.com", fragment: nil, host: "example.com", path: nil,
port: 443, query: nil, scheme: "https", userinfo: nil}},
{#PID<0.150.0>, {IEx.Evaluator, :init, 4}}, {21, 50, 9, 106655}}
redbug done, timeout - 1
iex(12)> Rexbug.start("URI.parse/1 :: stack", opts)
{82, 1}
iex(13)> spawn fn() -> URI.parse("https://example.com") end
term:
#PID<0.187.0>
{:call,
{{URI, :parse, ["https://example.com"]},
"=proc:<0.187.0>\nState: Running\nSpawned as: erlang:apply/2\nLast scheduled in for: erlang:apply/2\nSpawned by: <0.150.0>\nStarted: Wed Feb 7 21:52:42 2018\nMessage queue length: 0\nNumber of heap fragments: 0\nHeap fragment data: 0\nReductions: 0\nStack+heap: 233\nOldHeap: 0\nHeap unused: 21\nOldHeap unused: 0\nMemory: 2704\nStack dump:\nProgram counter: 0x0000000016adace0 (unknown function)\nCP: 0x0000000016adace8 (<terminate process normally>)\nInternal State: ACT_PRIO_NORMAL | USR_PRIO_NORMAL | PRQ_PRIO_NORMAL | ACTIVE | RUNNING | ON_HEAP_MSGQ\n"},
{#PID<0.187.0>, :dead}, {21, 52, 42, 71458}}
redbug done, timeout - 1
iex(14)> Rexbug.start("URI.parse/1 :: stack,return", opts)
{82, 1}
iex(15)> spawn fn() -> URI.parse("https://example.com") end
#PID<0.194.0>
term:
{:call,
{{URI, :parse, ["https://example.com"]},
"=proc:<0.194.0>\nState: Running\nSpawned as: erlang:apply/2\nLast scheduled in for: erlang:apply/2\nSpawned by: <0.150.0>\nStarted: Wed Feb 7 21:53:07 2018\nMessage queue length: 0\nNumber of heap fragments: 0\nHeap fragment data: 0\nReductions: 0\nStack+heap: 233\nOldHeap: 0\nHeap unused: 21\nOldHeap unused: 0\nMemory: 2704\nStack dump:\nProgram counter: 0x0000000016adace0 (unknown function)\nCP: 0x0000000016adace8 (<terminate process normally>)\nInternal State: ACT_PRIO_NORMAL | USR_PRIO_NORMAL | PRQ_PRIO_NORMAL | ACTIVE | RUNNING | ON_HEAP_MSGQ\n"},
{#PID<0.194.0>, :dead}, {21, 53, 7, 178108}}
term:
{:retn,
{{URI, :parse, 1},
%URI{authority: "example.com", fragment: nil, host: "example.com", path: nil,
port: 443, query: nil, scheme: "https", userinfo: nil}},
{#PID<0.194.0>, :dead}, {21, 53, 7, 178179}}
redbug done, timeout - 1
iex(18)> Rexbug.start(:send, [procs: :new] ++ opts)
{0, 0}
term:
{:send,
{{:io_request, #PID<0.210.0>, #Reference<0.0.2.1324>,
{:get_line, :unicode, "iex(19)> "}}, {#PID<0.50.0>, {:group, :server, 3}}},
{#PID<0.210.0>, {:erlang, :apply, 2}}, {21, 59, 39, 113386}}
iex(19)> spawn fn() -> send(self(), :wat) end
term:
{:send,
{{:input, #PID<0.210.0>, "spawn fn() -> send(self(), :wat) end\n"},
{#PID<0.51.0>, {:erlang, :apply, 2}}}, {#PID<0.210.0>, :dead},
{21, 59, 42, 769092}}
#PID<0.211.0>
term:
{:send, {:wat, {#PID<0.211.0>, :dead}}, {#PID<0.211.0>, :dead},
{21, 59, 42, 769563}}
term:
{:send,
{{:io_request, #PID<0.212.0>, #Reference<0.0.1.70>,
{:get_line, :unicode, "iex(20)> "}}, {#PID<0.50.0>, {:group, :server, 3}}},
{#PID<0.212.0>, {:erlang, :apply, 2}}, {21, 59, 42, 769809}}
redbug done, timeout - 4
iex(22)> Rexbug.start(:receive, opts)
term:
{82, 0}
{:recv, {:running, 82, 0}, {#PID<0.150.0>, {IEx.Evaluator, :init, 4}},
{22, 3, 29, 89757}}
term:
{:recv,
{:io_request, #PID<0.150.0>, #Reference<0.0.1.78>, {:get_geometry, :columns}},
{#PID<0.50.0>, {:group, :server, 3}}, {22, 3, 29, 89833}}
Currently Rexbug prints trace messages in Erlang syntax:
If
:redbuggot injected with the rightprint_funoption, it could be printing it in Elixir syntax.