Retain type refinements across calls to @SideEffectsOnly methods - #7973
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After a call to a method annotated @SideEffectsOnly, discard only what the annotation's expressions could have changed, rather than every refinement. A checker discards what it knows about an expression `e` if `e` contains a listed expression, and also if `e` contains a call through whose receiver or arguments a listed expression is reachable: a @pure method's result depends on state that no annotation declares, so approximate that state by what is reachable from the call's receiver and arguments. If a listed expression cannot be represented at the call site -- because viewpoint adaptation yields an Unknown, or because it cannot be parsed -- then return null, which makes the caller discard every refinement. Omitting the expression instead would treat the method as side-effecting less than it was declared to. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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@SideEffectsOnly methods
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Actionable comments posted: 7
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Inline comments:
In `@docs/manual/called-methods-checker.tex`:
- Around line 222-224: Document `@SideEffectsOnly` based on affected expressions
rather than annotation presence: in docs/manual/called-methods-checker.tex lines
222-224, qualify the sock.close() example with preservation only when no
viewpoint-adapted listed expression can affect it; apply the same condition to
the proposed annotation fix at lines 232-234. In
docs/manual/nullness-checker.tex lines 242-243, replace “for non-listed
expressions” with “for expressions not affected by any listed expression.” In
docs/manual/troubleshooting.tex line 350, state that `@SideEffectsOnly` alone does
not preserve currentOutgoing.
In
`@framework/src/main/java/org/checkerframework/common/basetype/BaseTypeVisitor.java`:
- Around line 246-248: Remove the unused sideEffectsOnlyValueElement field from
BaseTypeVisitor and delete its constructor lookup, while preserving the existing
element lookup used by AnnotatedTypeFactory.
In
`@framework/src/main/java/org/checkerframework/framework/flow/CFAbstractStore.java`:
- Around line 493-495: Update the Javadoc paragraph for
sideEffectsOnlyExpressions near isSideEffected to state that information is
removed for fields whose value one of the listed expressions may change,
covering direct matches, contained expressions, and calls that may alter the
field’s value.
- Around line 397-409: Reorder the parameters of mayReach to (input,
seOnlyExpr), matching mayChangeValue and callMayChangeValue, while preserving
its existing logic. Update all three mayReach call sites to pass the input
expression first and the se-only expression second.
- Around line 355-395: Update the Javadoc for callMayChangeValue to document
that static method calls cannot have their read state approximated from receiver
or arguments, so unrelated state may not invalidate their refinements. Add a
cross-class regression test covering a pure static call such as Util.get()
reading Other.field and verify that `@SideEffectsOnly`("Other.field") invalidates
the stored refinement.
- Around line 263-271: Update the thisIsSideEffected predicate in
CFAbstractStore so its stream match recognizes both ThisReference and
SuperReference expressions. Preserve the existing sideEffectsUnrefineAliases and
unrefinable-receiver checks, ensuring super references independently mark
thisValue as side-effected.
In
`@framework/src/main/java/org/checkerframework/framework/flow/CFAbstractTransfer.java`:
- Around line 1083-1084: Update visitObjectCreation to invoke
store.updateForMethodCall for constructors, matching the side-effect handling in
visitMethodInvocation, while preserving the existing processPostconditions
behavior. Ensure constructor annotations such as `@SideEffectsOnly` invalidate
affected refinements at new expressions.
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📒 Files selected for processing (25)
checker/src/test/java/org/checkerframework/checker/test/junit/OptionalSideEffectsTest.javachecker/src/test/java/org/checkerframework/checker/test/junit/SideEffectsOnlyTest.javachecker/tests/nullness/SetIteratorTest.javachecker/tests/nullness/SideEffectsOnlySuper.javachecker/tests/optional-side-effects/OptionalSideEffectsLambda.javachecker/tests/optional-side-effects/OptionalSideEffectsPrecondition.javachecker/tests/sideeffectsonly/PureMethodCallRefinement.javachecker/tests/sideeffectsonly/SideEffectsMultiple.javachecker/tests/sideeffectsonly/SideEffectsOnlyField.javachecker/tests/sideeffectsonly/SideEffectsOnlyTest1.javachecker/tests/sideeffectsonly/SideEffectsOnlyTest2.javachecker/tests/sideeffectsonly/SideEffectsTest1.javachecker/tests/sideeffectsonly/StaticIteratorSE.javachecker/tests/sideeffectsonly/UnrepresentableArgument.javadocs/manual/advanced-features.texdocs/manual/called-methods-checker.texdocs/manual/introduction.texdocs/manual/nullness-checker.texdocs/manual/purity-checker.texdocs/manual/troubleshooting.texframework/src/main/java/org/checkerframework/common/basetype/BaseTypeVisitor.javaframework/src/main/java/org/checkerframework/framework/flow/CFAbstractAnalysis.javaframework/src/main/java/org/checkerframework/framework/flow/CFAbstractStore.javaframework/src/main/java/org/checkerframework/framework/flow/CFAbstractTransfer.javaframework/src/main/java/org/checkerframework/framework/type/AnnotatedTypeFactory.java
💤 Files with no reviewable changes (1)
- checker/tests/nullness/SetIteratorTest.java
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Inline comments:
In
`@framework/src/main/java/org/checkerframework/framework/flow/CFAbstractStore.java`:
- Around line 346-350: Update mayChangeValue in CFAbstractStore so two
ArrayAccess values return true when their array operands may alias, unless their
index expressions are proven unequal; preserve non-array handling and existing
disjointness checks. Add a regression test covering a[i] versus a[0] with i
equal to 0 and verifying the refinement is invalidated after the side-effecting
call.
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📒 Files selected for processing (1)
framework/src/main/java/org/checkerframework/framework/flow/CFAbstractStore.java
smillst
approved these changes
Aug 14, 2026
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This pull request trusts the
@SideEffectsOnlyannotation; a subsequent PR will check it.After a call to a method annotated @SideEffectsOnly, discard only what the annotation's expressions could have changed, rather than every refinement.
A checker discards what it knows about an expression
eifecontains a listed expression, and also ifecontains a call through whose receiver or arguments a listed expression is reachable: a@Puremethod's result depends on state that no annotation declares, so approximate that state by what is reachable from the call's receiver and arguments.If a listed expression cannot be represented at the call site -- because viewpoint adaptation yields an Unknown, or because it cannot be parsed -- then return null, which makes the caller discard every refinement. Omitting the expression instead would treat the method as side-effecting less than it was declared to.