8000 Support `ivar_set` TracePoint event by st0012 · Pull Request #13369 · ruby/ruby · GitHub
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Support ivar_set TracePoint event #13369

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Support ivar_set TracePoint event #13369

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@st0012 st0012 commented May 18, 2025 •
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Feature #15854

This PR introduces:

  • A new ivar_set event to TracePoint, which will be triggered when a instance variable is set through:
    • Direct assignment, like @a = 1 8000
    • Attribute setters, like Foo.a = 1
    • instance_variable_set
  • A new ivar_name method to TracePoint instances that's only available for this event to retrieve the ivar's name in Symbol
    • The value can be retrieved through TracePoint#return_value

Example

TracePoint.trace(:ivar_set) do |tp|
  puts "ivar_set: #{tp.ivar_name.inspect}, value: #{tp.return_value.inspect}"
end

class Foo
  attr_accessor :b

  def initialize
    @a = 1
  end
end

foo = Foo.new
foo.b = 2
foo.instance_variable_set(:@c, 3)
# ivar_set: :@a, value: 1, lineno: 9
# ivar_set: :@b, value: 2, lineno: 14
# ivar_set: :@c, value: 3, lineno: 15

@launchable-app Launchable app

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@st0012 st0012 force-pushed the tp-ivar-set branch 2 times, most recently from 825ac0f to d77b090 Compare June 5, 2025 21:31
@st0012 st0012 changed the title [WIP] Support ivar_set TracePoint event Support ivar_set TracePoint event Jun 5, 2025
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