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Feature #5016

Kernel#caller with negative limit should limit result to N initial frames

Added by now (Nikolai Weibull) about 8 years ago. Updated about 7 years ago.

Status:
Closed
Priority:
Normal
Target version:
[ruby-core:37988]

Description

Calling Kernel#caller with a negative limit should limit result to N initial frames. When using Kernel#caller you often only want the first element of the result to get the information of the immediate caller. Generating the whole backtrace in this case is wasteful and time-consuming. Allowing Kernel#caller to take a negative limit to only return the first -N initial stack frames would allow for this.


Related issues

Related to Ruby master - Feature #1906: Kernel#backtrace: Objectifying Kernel#callerClosed08/07/2009Actions
Related to Ruby master - Feature #3917: [proposal] called_from() which is much faster than caller()Closed10/08/2010Actions

History

Updated by now (Nikolai Weibull) about 8 years ago

I wouldn’t say “dup”, but it’s certainly related. This interface can be used instead of adding Kernel#called_from, if we want to keep the number of methods down. Also, even if we objectify the backtrace as per #1906 that still doesn’t mean that we shouldn’t have the limit as per this feature request.

Updated by mame (Yusuke Endoh) over 7 years ago

  • Status changed from Open to Assigned
  • Assignee set to ko1 (Koichi Sasada)

Updated by ko1 (Koichi Sasada) over 7 years ago

Calling Kernel#caller with a negative limit should limit result to N initial frames. When using Kernel#caller you often only want the first element of the result to get the information of the immediate caller. Generating the whole backtrace in this case is wasteful and time-consuming. Allowing Kernel#caller to take a negative limit to only return the first -N initial stack frames would allow for this.

There are similar proposals.
https://bugs.ruby-lang.org/issues/3917

Maybe there are other proposals. I want to summarize and implement 2.0.
At first, I want to know other alternative proposals. Please let me know.

--
// SASADA Koichi at atdot dot net

Updated by ko1 (Koichi Sasada) about 7 years ago

  • Status changed from Assigned to Closed

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