The version of Node.js I used is 10.21.0. I modified BUILD.gn under deps/v8 folder: I set V8_TRACE_IGNITION=true and I rebuilt Node.js using ./configure after that. Then I run "node --trace-ignition xx.js". I expected to trace the ignition's behavior. But it said bad option. I was wondering where I did wrong.
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Does this answer your question? [How can i trace bytecode instructions in v8 library](https://stackoverflow.com/questions/49899664/how-can-i-trace-bytecode-instructions-in-v8-library) – 273K Aug 15 '22 at 15:08
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thanks for replying. I didn't find args.gn file in v8. I modified build.gn in v8. I think they work the same but maybe I am wrong. Still getting the same error – Zhe Li Aug 15 '22 at 16:19
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You seemed to misread it, and used the wrong option, but focused on the file name in that answer. – 273K Aug 15 '22 at 17:34
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I was wondering where I did wrong.
To get an answer to that, you'd have to describe exactly what you've done, e.g. by posting the patch showing your edits to the file.
That said, modifying BUILD.gn is not necessary to get --trace-ignition to work. Simply use gn args out/<your_output_dir> to edit your build settings as usual, and add v8_enable_trace_ignition = true.
jmrk
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