From: "deivid (David Rodríguez)" <deivid.rodriguez@...>
Date: 2013-06-30T22:18:09+09:00
Subject: [ruby-core:55713] [ruby-trunk - Bug #8538] c method not pushed into the callstack when called, but popped when returned


Issue #8538 has been updated by deivid (David Rodr��guez).


=begin
Thanks, @ko1. I commented the other issue, I think it's not the same thing.

I'm adding the actual output versus the expected output to try make this more clear.

    tp = TracePoint.new do |tp|
      warn "%-8s %-11p %s" % [tp.event, tp.method_id, caller]
    end
    tp.enable

    raise "bang!"

    # Actual output

    # c_return :enable     ["bt_test.rb:4:in `<main>'"]
    # line     nil         ["bt_test.rb:6:in `<main>'"]
    # c_call   :raise      ["bt_test.rb:6:in `<main>'"]
    # c_call   :new        ["bt_test.rb:6:in `raise'", "bt_test.rb:6:in `<main>'"]
    # c_call   :initialize ["bt_test.rb:6:in `new'", "bt_test.rb:6:in `raise'", "bt_test.rb:6:in `<main>'"]
    # c_return :initialize ["bt_test.rb:6:in `new'", "bt_test.rb:6:in `raise'", "bt_test.rb:6:in `<main>'"]
    # c_return :new        ["bt_test.rb:6:in `raise'", "bt_test.rb:6:in `<main>'"]
    # c_call   :backtrace  ["bt_test.rb:6:in `<main>'"]
    # c_return :backtrace  ["bt_test.rb:6:in `<main>'"]
    # raise    nil         ["bt_test.rb:6:in `<main>'"]
    # c_return :raise      ["bt_test.rb:6:in `<main>'"]
    # bt_test.rb:6:in `<main>': bang! (RuntimeError)


    # Expected output

    # c_return :enable     ["bt_test.rb:4:in `<main>'"]
    # line     nil         ["bt_test.rb:6:in `<main>'"]
    # c_call   :raise      ["bt_test.rb:6:in `<main>'"]
    # c_call   :new        ["bt_test.rb:6:in `raise'", "bt_test.rb:6:in `<main>'"]
    # c_call   :initialize ["bt_test.rb:6:in `new'", "bt_test.rb:6:in `raise'", "bt_test.rb:6:in `<main>'"]
    # c_return :initialize ["bt_test.rb:6:in `initialize'", "bt_test.rb:6:in `new'", "bt_test.rb:6:in `raise'", "bt_test.rb:6:in `<main>'"]
    # c_return :new        ["bt_test.rb:6:in `new'", "bt_test.rb:6:in `raise'", "bt_test.rb:6:in `<main>'"]
    # c_call   :backtrace  ["bt_test.rb:6:in `raise'", "bt_test.rb:6:in `<main>'"]
    # c_return :backtrace  ["bt_test.rb:6:in `backtrace'", "bt_test.rb:6:in `raise'", "bt_test.rb:6:in `<main>'"]
    # raise    nil         ["bt_test.rb:6:in `raise'", "bt_test.rb:6:in `<main>'"]
    # c_return :raise      ["bt_test.rb:6:in `raise'", "bt_test.rb:6:in `<main>'"]
    # bt_test.rb:6:in `<main>': bang! (RuntimeError)
=end

----------------------------------------
Bug #8538: c method not pushed into the callstack when called, but popped when returned
https://bugs.ruby-lang.org/issues/8538#change-40207

Author: deivid (David Rodr��guez)
Status: Open
Priority: Normal
Assignee: ko1 (Koichi Sasada)
Category: core
Target version: current: 2.1.0
ruby -v: ruby 2.0.0p195 (2013-05-14) [i686-linux]
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN


See the following example:

    trace = TracePoint.new do |tp|
      puts "Event: #{tp.event}, Method: #{tp.method_id}\n"
      puts "Stack: #{caller}\n\n"
    end

    trace.enable

    fail "bang!"

The output shows:

    Event: c_return, Method: enable
    Stack: ["trace.rb:6:in `<main>'"]

    Event: line, Method: 
    Stack: ["trace.rb:8:in `<main>'"]

    Event: c_call, Method: fail
    Stack: ["trace.rb:8:in `<main>'"]

    Event: c_call, Method: new
    Stack: ["trace.rb:8:in `fail'", "trace.rb:8:in `<main>'"]

    Event: c_call, Method: initialize
    Stack: ["trace.rb:8:in `new'", "trace.rb:8:in `fail'", "trace.rb:8:in `<main>'"]

    Event: c_return, Method: initialize
    Stack: ["trace.rb:8:in `new'", "trace.rb:8:in `fail'", "trace.rb:8:in `<main>'"]

    Event: c_return, Method: new
    Stack: ["trace.rb:8:in `fail'", "trace.rb:8:in `<main>'"]

    Event: c_call, Method: backtrace
    Stack: ["trace.rb:8:in `<main>'"]

    Event: c_return, Method: backtrace
    Stack: ["trace.rb:8:in `<main>'"]

    Event: raise, Method: 
    Stack: ["trace.rb:8:in `<main>'"]

    Event: c_return, Method: fail
    Stack: ["trace.rb:8:in `<main>'"]

    trace.rb:8:in `<main>': bang! (RuntimeError)

It looks like the method "initialize" is not pushed into the stack when called, but something (the previous method call) is popped when returning from it.

Thanks a lot.


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