[ruby-core:100688] [Ruby master Bug#17302] The TracePoint API does not allow setting multiple line traces within the same method (ISEQ)

Issue #17302 has been updated by [e-mail] (Liran Haimovitch).


[e-mail] (Liran Haimovitch) wrote in #note-1:
> [e-mail] (Liran Haimovitch) wrote:
> > When setting a second line tracepoint within a method the first one will be turned off.
> > 
> > I believe this is due to the fact that the encoded_iseq_trace_instrument function resets the trace value of an instruction rather then just turn it on if needed - https://github.com/ruby/ruby/blob/799253dc46e96518687dcd4fdca42582251ccffe/iseq.c#L3178
> > 
> > And it is unconditionally called, not limited to the correct line: https://github.com/ruby/ruby/blob/799253dc46e96518687dcd4fdca42582251ccffe/iseq.c#L3219
> 
> Attaching a short file to reproduce the bug, based on the existing `enable_spec.rb` in the Ruby repo.


After some additional investigation, it seems that when adding multiple breakpoints to the same method (ISEQ) only the last one will apply. BUT, if I disable even one of them, all the breakpoints that are left enabled will work simultaneously. 

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Bug #17302: The TracePoint API does not allow setting multiple line traces within the same method (ISEQ)
https://bugs.ruby-lang.org/issues/17302#change-88329

* Author: [e-mail] (Liran Haimovitch)
* Status: Open
* Priority: Normal
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
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When setting a second line tracepoint within a method the first one will be turned off.

I believe this is due to the fact that the encoded_iseq_trace_instrument function resets the trace value of an instruction rather then just turn it on if needed - https://github.com/ruby/ruby/blob/799253dc46e96518687dcd4fdca42582251ccffe/iseq.c#L3178

And it is unconditionally called, not limited to the correct line: https://github.com/ruby/ruby/blob/799253dc46e96518687dcd4fdca42582251ccffe/iseq.c#L3219

---Files--------------------------------
my_test.rb (790 Bytes)


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