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32 lines
1.3 KiB
Markdown
32 lines
1.3 KiB
Markdown
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# Debug Adapter Protocol
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[Debug Adapter Protocol](https://www.graalvm.org/latest/tools/dap/) is yet
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another instrument available for a Truffle language. The DAP is a native
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protocol for VSCode and as such, works only via VSCode. To start Enso with DAP
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server waiting for a client to attach, launch enso via:
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```
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env JAVA_OPTS='-Dpolyglot.dap' ./built-distribution/enso-engine-*/enso-*/bin/enso --run *.enso
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```
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Once DAP server is started and ready for a client to be attached, the following
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output will be printed:
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```
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[Graal DAP] Starting server and listening on /127.0.0.1:4711
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```
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There is a
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[Launch configuration](https://code.visualstudio.com/docs/editor/debugging#_launch-configurations)
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in the repository in
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[.vscode/launch.json](https://github.com/enso-org/enso/blob/a123cd0d9f4b04d05aae7a5231efba554062188f/.vscode/launch.json#L13-L16)
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with name `Debug Adapter Protocol`, you can start debugging via
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[Run and Debug view](https://code.visualstudio.com/docs/editor/debugging#_run-and-debug-view)
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by selecting the `Debug adapter protocol` configuration and pressing play:
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Another screenshot showing the DAP in action:
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Note that the port 4711 is the default port for DAP.
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