From: kazuki@...
Date: 2015-01-02T09:49:43+00:00
Subject: [ruby-dev:48797] [ruby-trunk - Bug #10689] [Open] `unexpected break' occurs when TracePoint#binding is called

Issue #10689 has been reported by Kazuki Tsujimoto.

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Bug #10689: `unexpected break' occurs when TracePoint#binding is called
https://bugs.ruby-lang.org/issues/10689

* Author: Kazuki Tsujimoto
* Status: Open
* Priority: Normal
* Assignee: 
* Category: core
* Target version: 
* ruby -v: ruby 2.3.0dev (2015-01-02 trunk 49102) [x86_64-linux]
* Backport: 2.0.0: REQUIRED, 2.1: REQUIRED, 2.2: REQUIRED
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以下のコードでunexpected breakになります。

~~~ruby
class Bug
  include Enumerable

  def each
    [0].each do 
      yield
    end
  end
end

TracePoint.trace(:c_return) do |tp|
  tp.binding
end

Bug.new.all? { false }
~~~

all?中のrb_iter_breakによってth->errinfoがセットされた後に、
TracePoint#binding呼び出しによってcfpのepがヒープを指すようになってしまうのが原因です。

とりあえずTracePoint呼び出し後にth->errinfoのepを書き換えるようにしてみたパッチを添付します。


---Files--------------------------------
fix-unexpected-break.patch (3.32 KB)


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