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ZJIT: Create delta debugging script to narrow JIT failures (#14041)

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Add support for `--zjit-allowed-iseqs=SomeFile` and
`--zjit-log-compiled-iseqs=SomeFile` so we can restrict and inspect
which ISEQs get compiled.

Then add `jit_bisect.rb` which we can run to try and narrow a failing
script. For example:

    plum% ../tool/zjit_bisect.rb ../build-dev/miniruby "test.rb"
    I, [2025-07-29T12:41:18.657177 #96899]  INFO -- : Starting with JIT list of 4 items.
    I, [2025-07-29T12:41:18.657229 #96899]  INFO -- : Verifying items
    I, [2025-07-29T12:41:18.726213 #96899]  INFO -- : step fixed[0] and items[4]
    I, [2025-07-29T12:41:18.726246 #96899]  INFO -- : 4 candidates
    I, [2025-07-29T12:41:18.797212 #96899]  INFO -- : 2 candidates
    Reduced JIT list:
    bar@test.rb:8
    plum%

We start with 4 compiled functions and shrink to just one.
This commit is contained in:
Max Bernstein 2025-07-29 12:43:14 -07:00 • committed by GitHub
parent b07e214bf1
commit 039f4139f8
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5 changed files with 182 additions and 2 deletions
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4
zjit/src/codegen.rs
View file

@ -284,6 +284,10 @@ fn gen_function(cb: &mut CodeBlock, iseq: IseqPtr, function: &Function) -> Optio
let iseq_name = iseq_get_location(iseq, 0);
register_with_perf(iseq_name, start_usize, code_size);
}
if ZJITState::should_log_compiled_iseqs() {
let iseq_name = iseq_get_location(iseq, 0);
ZJITState::log_compile(iseq_name);
}
}
result
}