Analyse escaping for local vars #4658
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…ir defining scope
…defining scope or which variables will escape its defining scope
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rewrite-java/src/test/java/org/openrewrite/java/search/FindEscapingVariablesTest.java
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rewrite-java/src/test/java/org/openrewrite/java/search/FindVariableEscapeLocationsTest.java
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Not specifically related to this PR, but thought that I'd share a bit simpler data flow API example given I too found rewrite-security-frameworks a bit difficult to follow originally. I ended up using the data flow API over in rewrite-feature-flags to great effect. |
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Thanks @shanman190 for the reference, I'll definitely have a look. I think the Dataflow API needs some introduction material. After I had a breakthrough I'll share some ;) |
…iableEscapeLocationsTest.java Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
rewrite-java/src/test/java/org/openrewrite/java/search/FindEscapingVariablesTest.java
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Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
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What's changed?
I added two visitors that help decide if variables escape and where.
What's your motivation?
When migrating existing code, the question "Is this instance ever leaking its defining scope?" raises from time to time.
Take the migration from
StringBuffertoStringBuilder.StringBuilderis generally in favor, if no synchronization is needed (see JavaDoc StringBuilder).Synchronization is not needed if the instance never escapes its defining scope.
These helping visitors enable such migration by answering the question of escaping vars.
Anything in particular you'd like reviewers to focus on?
Additional ways to leak an instance.
Anyone you would like to review specifically?
Have you considered any alternatives or workarounds?
I considered the Dataflow API, but I am not fluent enough to archive the same..
Any additional context
This visitor and its helper methods will help @mkarg to realize his migrations for the OpenJDK project.
Checklist