[ruby-core:122410] [Ruby Bug#21395] Please backport 8d49c05c134702c321198b70fbbf34dd80cc1ba6

Issue #21395 has been updated by Eregon (Benoit Daloze).

Subject changed from Please backport caa6ba1a46afa1bc696adc5fe91ee992f9570c89 to Please backport 8d49c05c134702c321198b70fbbf34dd80cc1ba6
Description updated

8d49c05c134702c321198b70fbbf34dd80cc1ba6 seems to only change the `debug` gem version, I guess you mean some other commit to backport?
Probably https://github.com/ruby/ruby/commit/caa6ba1a46afa1bc696adc5fe91ee992f9570c89

> As a result, the indices in this array became inconsistent with the indices expected by rb_debug_inspector_frame_binding_get(index) and similar functions.

Interesting, so that means rb_debug_inspector_frame_binding_get() doesn't actually use that array to get the information but some other internal data structure: https://github.com/ruby/ruby/blob/2cce628721728409a26c2d4732f63419785c7fd8/vm_backtrace.c#L1499-L1500
IOW the `backtrace` and `contexts` lengths should match, it would be good to add a check for that.

The second fix seems better (longer-term) as such internal frames shouldn't be exposed and it causes an inconsistency between `rb_debug_inspector_backtrace_locations()` and `caller_locations`, and the former documents to be equivalent to the latter.

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Bug #21395: Please backport 8d49c05c134702c321198b70fbbf34dd80cc1ba6
https://bugs.ruby-lang.org/issues/21395#change-113588

* Author: mame (Yusuke Endoh)
* Status: Closed
* Backport: 3.2: DONTNEED, 3.3: DONTNEED, 3.4: REQUIRED
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In Ruby 3.4, debug.gem raises an exception when stepping into a rescue clause:

https://github.com/ruby/debug/pull/1142

I discussed with @ko1, and we decided to resolve this by modifying `rb_debug_inspector_backtrace_locations` to return a raw array of `Thread::Backtrace::Location`.

This ticket is to request backporting commit:8d49c05c134702c321198b70fbbf34dd80cc1ba6, which implements that change, into Ruby 3.4.

---

As a record, here is a more detailed explanation of the issue:

Starting from Ruby 3.4, rescue and ensure frames have been excluded from backtraces (see #20275).
This change broke the assumption of the debug inspector API.

The debug inspector API is designed to be used as follows:

1. Obtain an array of `Thread::Backtrace::Location` using `rb_debug_inspector_backtrace_locations`
2. For each index in that array, obtain more detailed information using functions like `rb_debug_inspector_frame_binding_get(index)`

Due to the changes in #20275, rescue/ensure frames were removed from the array returned by `rb_debug_inspector_backtrace_locations`.
As a result, the indices in this array became inconsistent with the indices expected by `rb_debug_inspector_frame_binding_get(index)` and similar functions.

There are two possible directions for fixing this:

1. Modify `rb_debug_inspector_backtrace_locations` to return the raw backtrace without removing rescue/ensure frames.
2. Modify `rb_debug_inspector_frame_binding_get(index)` to take into account the removal of rescue/ensure frames and return the corresponding data accordingly.

@ko1 is interested in trying (2) in the future, but for now, commit 8d49c05c134702c321198b70fbbf34dd80cc1ba6 implements the simpler fix, (1).










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