From: mame@... Date: 2018-06-03T22:54:48+00:00 Subject: [ruby-dev:50559] [Ruby trunk Bug#14817] TracePoint#parameters for bmethod's return event should return the same value as its Method#parameters Issue #14817 has been updated by mame (Yusuke Endoh). TracePoint#parameters の問題ではなく、define_method + TracePoint 全般の問題のようです。 ``` define_method(:bm) {|a|} trace = TracePoint.new(:call, :return){|tp| p [tp.event, tp.lineno] if tp.method_id == :bm } trace.enable{ bm(0) } ``` ``` $ ./miniruby test.rb [:call, 1] [:return, 7] #=> [:return, 1] になるべき? ``` ---------------------------------------- Bug #14817: TracePoint#parameters for bmethod's return event should return the same value as its Method#parameters https://bugs.ruby-lang.org/issues/14817#change-72354 * Author: ktsj (Kazuki Tsujimoto) * Status: Assigned * Priority: Normal * Assignee: mame (Yusuke Endoh) * Target version: 2.6 * ruby -v: ruby 2.6.0dev (2018-06-03 master 63562) [x86_64-linux] * Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN ---------------------------------------- define_methodしたメソッド(bmethod)のcall/returnイベント中にTracePoint#parametersを呼び出すと 以下の結果となります。 ``` $ cat t.rb define_method(:bm) {|a|} p method_parameters: method(:bm).parameters trace = TracePoint.new(:call, :return){|tp| mid = tp.method_id if mid == :bm p mid: mid, event: tp.event, tp_parameters: tp.parameters end } trace.enable{ bm(0) } $ ruby -v t.rb ruby 2.6.0dev (2018-06-03 master 63562) [x86_64-linux] {:method_parameters=>[[:req, :a]]} {:mid=>:bm, :event=>:call, :tp_parameters=>[[:req, :a]]} {:mid=>:bm, :event=>:return, :tp_parameters=>[]} #=> expected: {:mid=>:bm, :event=>:return, :tp_parameters=>[[:req, :a]]} ``` 現状、callイベントに限ってその戻り値がbmethodのMethod#parametersの呼び出し結果と一致しますが returnイベント時も同様となるべきだと思います。 -- https://bugs.ruby-lang.org/