Add javacutil utilities for reasoning about constructors and initializers

[mernst]

TreeUtils.getExplicitConstructorCall, TreePathUtil.getInstanceInitializers, and ElementUtils.getNoArgumentConstructor.

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Reviewing files that changed from the base of the PR and between df9c6f1 and fa8a58b.

📒 Files selected for processing (3)

• annotation-file-utilities/src/main/java/org/checkerframework/afu/annotator/scanner/TreePathUtil.java
• framework/src/test/java/org/checkerframework/framework/test/junit/TreePathUtilTest.java
• javacutil/src/main/java/org/checkerframework/javacutil/TreePathUtil.java

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📝 Walkthrough

Walkthrough

Added ElementUtils.getNoArgumentConstructor to locate a declared no-argument constructor. Added TreePathUtil.getInstanceInitializers to collect non-static field initializers and initializer blocks. Added TreeUtils.getExplicitConstructorCall to find explicit this(...) or super(...) calls in constructor bodies. Added tests for instance initializer collection. Annotated findEnclosingFieldInit as nullable.

Merge Risk: 🔵 Low · up to fa8a5

The initializer utility may incorrectly include implicitly static interface fields, which could cause downstream analyses to inspect the wrong members; the PR is mergeable with explicit owner awareness or a targeted fix or confirmation.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 72.22% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 18 functions across 5 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[mernst]

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Actionable comments posted: 1

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Inline comments:
In `@javacutil/src/main/java/org/checkerframework/javacutil/TreePathUtil.java`:
- Around line 116-118: Update the instance-initializer collection condition
around variable.getInitializer() to exclude interface fields even when static is
implicit; use TreeUtils.elementFromDeclaration(variable) with a null-safe
ElementUtils.hasReceiver check, or explicitly detect interface members. Add a
regression test covering an interface field without an explicit static modifier.

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📥 Commits

Reviewing files that changed from the base of the PR and between e309509 and 5acb0af.

📒 Files selected for processing (3)

• javacutil/src/main/java/org/checkerframework/javacutil/ElementUtils.java
• javacutil/src/main/java/org/checkerframework/javacutil/TreePathUtil.java
• javacutil/src/main/java/org/checkerframework/javacutil/TreeUtils.java

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