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| -rw-r--r-- | doc/zjit.md | 8 |
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diff --git a/doc/zjit.md b/doc/zjit.md index 3d7ee33abf..bb20b9f692 100644 --- a/doc/zjit.md +++ b/doc/zjit.md @@ -162,6 +162,14 @@ A file called `zjit_exits_{pid}.dump` will be created in the same directory as ` stackprof path/to/zjit_exits_{pid}.dump ``` +### Viewing HIR in Iongraph + +Using `--zjit-dump-hir-iongraph` will dump all compiled functions into a directory named `/tmp/zjit-iongraph-{PROCESS_PID}`. Each file will be named `func_{ZJIT_FUNC_NAME}.json`. In order to use them in the Iongraph viewer, you'll need to use `jq` to collate them to a single file. An example invocation of `jq` is shown below for reference. + +`jq --slurp --null-input '.functions=inputs | .version=2' /tmp/zjit-iongraph-{PROCESS_PID}/func*.json > ~/Downloads/ion.json` + +From there, you can use https://mozilla-spidermonkey.github.io/iongraph/ to view your trace. + ### Printing ZJIT Errors `--zjit-debug` prints ZJIT compilation errors and other diagnostics: |