[ruby-core:94339] [Ruby master Feature#15912] Allow some reentrancy during TracePoint events

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Issue #15912 has been updated by ko1 (Koichi Sasada). > But then I thought that we could even allow events of the same type, as l= ong as we forbid handlers currently being run from being triggered. > So in my example, line_handler2 executions in lines 5 and 7 would not run= line_handler1, but the execution in line 8 would run it (twice, actually). ... > The idea is running any possible relevant event handler as long as it's n= ot already in the stack of event handlers currently being run. Why line 5, line 7 would not invoked? I can't understand the rule. And how about line 10, 12? ---------------------------------------- Feature #15912: Allow some reentrancy during TracePoint events https://bugs.ruby-lang.org/issues/15912#change-80738 * Author: deivid (David Rodr=EDguez) * Status: Assigned * Priority: Normal * Assignee: ko1 (Koichi Sasada) * Target version: = ---------------------------------------- I got a report in byebug about byebug being incompatible with zeitwerk. Thi= s one: https://github.com/deivid-rodriguez/byebug/issues/564. This is a pro= blem because zeitwerk is the default Rails code loader, and byebug is the d= efault Rails debugger. Both of these tools rely on the TracePoint API: * Byebug uses a bunch of TracePoint events to stop execution at certain poi= nts in your program. * Zeitwek uses `:class` events to be able to resolve some circular edge cas= es. I investigated the problem and I think the issue is that while stopped at t= he byebug prompt, we're actually in the middle of processing a TracePoint e= vent. That means that further TracePoint events triggered at the byebug's p= rompt will be ignored, because otherwise we could get into an infinite loop= where the handling of events would trigger more events that trigger themse= lves the execution of handlers again. I understand why the TracePoint API does this, but if we could allow some l= evel of reentrancy here, we could probably make these tools play nice toget= her. I figure if we kept a stack of TracePoint event handlers being run, an= d check that the current event type is not already in the stack, we would a= llow :class events to be triggered from :line events, and I think that woul= d allow Zeitwerk to work within byebug. What do you think about this, @ko1? -- = https://bugs.ruby-lang.org/ Unsubscribe: <mailto:ruby-core-request / ruby-lang.org?subject=3Dunsubscribe> <http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core>