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Don't write irrelevant annotations in .ajava files - #8184

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@mernst mernst commented Sep 16, 2026 •

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When a checker declares @RelevantJavaTypes, whole-program inference could write, into an .ajava file, an annotation on a Java type that the checker treats as irrelevant. Such an annotation is clutter: omitting it does not change the result of type-checking.

Omit such an annotation when writing the .ajava file. The test is conservative: it discards an annotation only when the annotation is definitely irrelevant where it appears.

Relevance constrains the Java types on which a qualifier may be written, so it says nothing about a declaration annotation, even one that is also a type qualifier. JavaParser attaches an annotation that precedes a declaration's type to the declaration rather than to the type, so the two cases cannot be told apart from the AST alone. Each annotation that inference adds as a declaration annotation is marked with a JavaParser DataKey and always retained.

Updates the ainfer-relevance goal files and the test inputs' comments, which recorded the old behavior.

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mernst and others added 2 commits September 16, 2026 11:30
To avoid cluttering an ajava file, whole-program inference does not print the
invisible qualifiers.  It suppressed them by overriding the pretty-printer's
three `visit(...AnnotationExpr)` methods to return without printing.  By the
time the pretty-printer visits an annotation, it has already printed the
whitespace that separates the annotation from what follows it, so each
suppressed annotation leaves a stray space or blank line:  `java.util. Date`,
`static   double`, `String  []  []`.  That partly defeats the purpose of not
printing the annotation, which is to reduce clutter.

Instead, remove the annotations that should not be printed from a clone of the
compilation unit, and print that.  The pretty-printer then outputs no
separator for them.  The clone is necessary because the removal is a side
effect, and the AST is printed once per checker that was run.

No test output changes:  the test checkers declare no invisible qualifier, so
nothing is removed in the test suite.  This refactoring is worthwhile on its
own for the stray whitespace it fixes for a checker that does declare one, and
it is a prerequisite for omitting irrelevant annotations, which would
otherwise leave the same stray whitespace on every annotation it omits.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
When a checker declares `@RelevantJavaTypes`, whole-program inference could
write, into an `.ajava` file, an annotation on a Java type that the checker
treats as irrelevant.  Such an annotation is clutter:  omitting it does not
change the result of type-checking.

Omit such an annotation when writing the `.ajava` file.  The test is
conservative:  it discards an annotation only when the annotation is
definitely irrelevant where it appears.

Relevance constrains the Java types on which a qualifier may be *written*, so
it says nothing about a declaration annotation, even one that is also a type
qualifier.  JavaParser attaches an annotation that precedes a declaration's
type to the declaration rather than to the type, so the two cases cannot be
told apart from the AST alone.  Mark each annotation that inference adds as a
declaration annotation with a JavaParser `DataKey`, and always retain it.

Update the `ainfer-relevance` goal files and the test inputs' comments, which
previously recorded the old behavior.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
mernst and others added 3 commits September 16, 2026 12:36
When the checker supports no invisible qualifier, `removeUnprintedAnnotations`
has no effect, so skip both it and the clone that it requires.  Also, walk the
AST rather than building a list of every node in it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
…ork-fork-mernst-branch-ajava-remove-annotations-from-ast into ajava-omit-irrelevant

# Conflicts:
#	framework/src/main/java/org/checkerframework/common/wholeprograminference/WholeProgramInferenceJavaParserStorage.java
Their computation is reflective, and they do not change over the lifetime of a
`WholeProgramInferenceJavaParserStorage`.  The computation is lazy rather than
in the constructor, because `getSupportedTypeQualifiers()` might not yet yield
its final result when the storage is constructed.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Base automatically changed from ajava-remove-annotations-from-ast to master September 17, 2026 01:53
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📒 Files selected for processing (9)
  • checker/tests/ainfer-relevance/IShouldBeSibling1.ajava.goal
  • checker/tests/ainfer-relevance/IrrelevantTypes.ajava.goal
  • checker/tests/ainfer-relevance/RelevantSubtype.ajava.goal
  • checker/tests/ainfer-relevance/RelevantTypes.ajava.goal
  • checker/tests/ainfer-relevance/non-annotated/IrrelevantTypes.java
  • checker/tests/ainfer-relevance/non-annotated/RelevantSubtype.java
  • checker/tests/ainfer-relevance/non-annotated/RelevantTypes.java
  • framework/src/main/java/org/checkerframework/common/wholeprograminference/WholeProgramInferenceJavaParserStorage.java
  • framework/src/main/java/org/checkerframework/framework/util/JavaParserUtil.java

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📝 Walkthrough

Walkthrough

WholeProgramInferenceJavaParserStorage now tracks annotation relevance, preserves declaration annotations, and filters irrelevant annotations from checker-specific generated output. JavaParserUtil converts supported JavaParser types to TypeMirror values. The relevance tests now expect omitted annotations for irrelevant types.

Priority: ➖ Normal

Change: Bug fix

Merge Risk: 🔵 Low · up to 966b7

Original-source output can delete programmer-written invisible qualifiers. Restrict that filtering to checker-specific output before merging.

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Actionable comments posted: 1

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Inline comments:
In
`@framework/src/main/java/org/checkerframework/common/wholeprograminference/WholeProgramInferenceJavaParserStorage.java`:
- Around line 1407-1408: Update the annotation-filtering predicate in
writeAjavaFile so programmer-written invisible qualifiers are retained when
omitIrrelevantAnnotations is false, while inferred invisible qualifiers remain
removable under the existing omit path. Preserve the separate
invisible-qualifier contract and do not exempt annotations merely because
annotationIsRelevant or IS_DECLARATION_ANNOTATION identifies them as declaration
annotations.

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📒 Files selected for processing (9)
  • checker/tests/ainfer-relevance/IShouldBeSibling1.ajava.goal
  • checker/tests/ainfer-relevance/IrrelevantTypes.ajava.goal
  • checker/tests/ainfer-relevance/RelevantSubtype.ajava.goal
  • checker/tests/ainfer-relevance/RelevantTypes.ajava.goal
  • checker/tests/ainfer-relevance/non-annotated/IrrelevantTypes.java
  • checker/tests/ainfer-relevance/non-annotated/RelevantSubtype.java
  • checker/tests/ainfer-relevance/non-annotated/RelevantTypes.java
  • docs/CHANGELOG.md
  • framework/src/main/java/org/checkerframework/common/wholeprograminference/WholeProgramInferenceJavaParserStorage.java

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mernst and others added 13 commits September 16, 2026 19:40
…ork-fork-mernst-branch-ajava-remove-annotations-from-ast into ajava-omit-irrelevant
…ork-fork-mernst-branch-ajava-remove-annotations-from-ast into ajava-omit-irrelevant
* Skip cloning and walking the AST when no annotation can be removed.
* Don't crash if a declaration has no variables; be conservative instead.
* Fix comments about where an annotation on a type parameter declaration lands.
* Narrow a @SuppressWarnings from a method to a single expression.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
…ork-fork-mernst-branch-ajava-remove-annotations-from-ast into ajava-omit-irrelevant
Also correct the comment about why the compilation unit must be cloned.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
…ork-fork-mernst-branch-ajava-remove-annotations-from-ast into ajava-omit-irrelevant

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
@mernst mernst closed this Sep 17, 2026
@mernst
mernst deleted the ajava-omit-irrelevant branch September 17, 2026 19:06
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