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src: simplify embedder entry point execution. #51557

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merged 2 commits into from
Feb 23, 2024

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Previously we wrapped the embedder entry point callback into a binding and then invoke the binding from JS land which was a bit convoluted. Now we just call it directly from C++. The main scripts that needed to tail call the embedder callback now return the arguments in an array so that the C++ land can extract the arguments and pass them to the callback. We also set PauseOnNextJavascriptStatement() for --inspect-brk and mark the bootstrap complete milestone directly in C++ for these execution modes.

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Review requested:

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@nodejs-github-bot nodejs-github-bot added c++ Issues and PRs that require attention from people who are familiar with C++. lib / src Issues and PRs related to general changes in the lib or src directory. needs-ci PRs that need a full CI run. labels Jan 24, 2024
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@nodejs/startup @nodejs/cpp-reviewers Can I get some reviews please? Thanks!

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Previously we wrapped the embedder entry point callback into a
binding and then invoke the binding from JS land which was a bit
convoluted. Now we just call it directly from C++.
The main scripts that needed to tail call the embedder callback now
return the arguments in an array so that the C++ land can extract
the arguments and pass them to the callback. We also set
`PauseOnNextJavascriptStatement()` for --inspect-brk and mark
the bootstrap complete milestone directly in C++ for these
execution modes.
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return scope.EscapeMaybe(StartExecution(env, entry));
env->performance_state()->Mark(
performance::NODE_PERFORMANCE_MILESTONE_BOOTSTRAP_COMPLETE);
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I think this can still be marked in JS with markBootstrapComplete, similar to other entry points.

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The other entry points don't take callbacks. I think it's less convoluted to mark this right before we invoke the callback, otherwise it's quite difficult to wrap your head around things going back and forth between C++ and JS for these entry points that take callbacks (that's what I feel whenever I looked at these two, and I even reviewed the original changes).

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@joyeecheung joyeecheung added the request-ci Add this label to start a Jenkins CI on a PR. label Feb 22, 2024
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@joyeecheung joyeecheung added commit-queue Add this label to land a pull request using GitHub Actions. commit-queue-squash Add this label to instruct the Commit Queue to squash all the PR commits into the first one. labels Feb 23, 2024
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@nodejs-github-bot nodejs-github-bot merged commit f29d2b7 into nodejs:main Feb 23, 2024
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Landed in f29d2b7

marco-ippolito pushed a commit that referenced this pull request Feb 26, 2024
Previously we wrapped the embedder entry point callback into a
binding and then invoke the binding from JS land which was a bit
convoluted. Now we just call it directly from C++.
The main scripts that needed to tail call the embedder callback now
return the arguments in an array so that the C++ land can extract
the arguments and pass them to the callback. We also set
`PauseOnNextJavascriptStatement()` for --inspect-brk and mark
the bootstrap complete milestone directly in C++ for these
execution modes.

PR-URL: #51557
Reviewed-By: Daniel Lemire <[email protected]>
Reviewed-By: Chengzhong Wu <[email protected]>
marco-ippolito pushed a commit that referenced this pull request Feb 26, 2024
Previously we wrapped the embedder entry point callback into a
binding and then invoke the binding from JS land which was a bit
convoluted. Now we just call it directly from C++.
The main scripts that needed to tail call the embedder callback now
return the arguments in an array so that the C++ land can extract
the arguments and pass them to the callback. We also set
`PauseOnNextJavascriptStatement()` for --inspect-brk and mark
the bootstrap complete milestone directly in C++ for these
execution modes.

PR-URL: #51557
Reviewed-By: Daniel Lemire <[email protected]>
Reviewed-By: Chengzhong Wu <[email protected]>
marco-ippolito pushed a commit that referenced this pull request Feb 27, 2024
Previously we wrapped the embedder entry point callback into a
binding and then invoke the binding from JS land which was a bit
convoluted. Now we just call it directly from C++.
The main scripts that needed to tail call the embedder callback now
return the arguments in an array so that the C++ land can extract
the arguments and pass them to the callback. We also set
`PauseOnNextJavascriptStatement()` for --inspect-brk and mark
the bootstrap complete milestone directly in C++ for these
execution modes.

PR-URL: #51557
Reviewed-By: Daniel Lemire <[email protected]>
Reviewed-By: Chengzhong Wu <[email protected]>
@marco-ippolito marco-ippolito mentioned this pull request Mar 1, 2024
richardlau pushed a commit that referenced this pull request Mar 25, 2024
Previously we wrapped the embedder entry point callback into a
binding and then invoke the binding from JS land which was a bit
convoluted. Now we just call it directly from C++.
The main scripts that needed to tail call the embedder callback now
return the arguments in an array so that the C++ land can extract
the arguments and pass them to the callback. We also set
`PauseOnNextJavascriptStatement()` for --inspect-brk and mark
the bootstrap complete milestone directly in C++ for these
execution modes.

PR-URL: #51557
Reviewed-By: Daniel Lemire <[email protected]>
Reviewed-By: Chengzhong Wu <[email protected]>
richardlau pushed a commit that referenced this pull request Mar 25, 2024
Previously we wrapped the embedder entry point callback into a
binding and then invoke the binding from JS land which was a bit
convoluted. Now we just call it directly from C++.
The main scripts that needed to tail call the embedder callback now
return the arguments in an array so that the C++ land can extract
the arguments and pass them to the callback. We also set
`PauseOnNextJavascriptStatement()` for --inspect-brk and mark
the bootstrap complete milestone directly in C++ for these
execution modes.

PR-URL: #51557
Reviewed-By: Daniel Lemire <[email protected]>
Reviewed-By: Chengzhong Wu <[email protected]>
@richardlau richardlau mentioned this pull request Mar 25, 2024
rdw-msft pushed a commit to rdw-msft/node that referenced this pull request Mar 26, 2024
Previously we wrapped the embedder entry point callback into a
binding and then invoke the binding from JS land which was a bit
convoluted. Now we just call it directly from C++.
The main scripts that needed to tail call the embedder callback now
return the arguments in an array so that the C++ land can extract
the arguments and pass them to the callback. We also set
`PauseOnNextJavascriptStatement()` for --inspect-brk and mark
the bootstrap complete milestone directly in C++ for these
execution modes.

PR-URL: nodejs#51557
Reviewed-By: Daniel Lemire <[email protected]>
Reviewed-By: Chengzhong Wu <[email protected]>
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4 participants