Fix byte and short annotation elements in annotation files - #8218
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In `AnnotationFileParser.convert`, binary numeric promotion made the BYTE
and SHORT cases produce an `int`, so the boxed result was an `Integer`
rather than a `Byte` or `Short`. `AnnotationBuilder.setValue` then threw
`BugInCF` because the value's run-time class did not match the declared
element type. Cast each product back to the expected type.
Also add the missing `Byte` case to `builderSetValue`, which otherwise
falls through to `throw new BugInCF("Unexpected builder value: %s", ...)`.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughThe change adds Priority: ⬇️ Low Change: Bug fix Merge Risk: 🔵 Low · up to Invalid byte and short annotation literals can silently produce incorrect annotation values. The fix is localized, but this edge case should be addressed before merge. 🚥 Pre-merge checks | ✅ 3✅ Passed checks (3 passed)
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Inline comments:
In
`@framework/src/main/java/org/checkerframework/framework/stub/AnnotationFileParser.java`:
- Around line 2673-2674: Update the BYTE and SHORT branches in the annotation
value conversion logic to apply scalefactor to the original number in a wider
numeric type before narrowing. Validate the scaled result against the byte or
short range first, then perform the narrowing conversion so out-of-range
literals are rejected rather than wrapped.
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checker/jtreg/stubs/issue1542/ExampleAnno.javachecker/jtreg/stubs/issue1542/Stub.astubchecker/jtreg/stubs/issue1542/Stub.javaframework/src/main/java/org/checkerframework/framework/stub/AnnotationFileParser.java
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`AnnotationFileParser.getValueOfExpressionInAnnotation` returned a `Double` for a `DoubleLiteralExpr` without converting it, so a `float` annotation element such as `@FloatExample(1.0f)` crashed with `BugInCF: found: java.lang.Double; expected: java.lang.Float`. JavaParser represents both `float` and `double` literals as a `DoubleLiteralExpr`, so the value must be converted to the element's declared type. A floating-point literal for an integral element is now reported rather than truncated. `AnnotationFileParser.convert` narrowed an integral value by casting, so `@Anno(200)` for a `byte` element silently stored `-56` even though javac rejects the equivalent source annotation. Range-check the value and report an out-of-range value as a warning. To make the range check possible, the unary-minus case obtains its operand's value as a `long` or `double` rather than as the element's declared type; the negated value is then range-checked. This also replaces the `BugInCF` for a negated `char` with a warning.
1 participant
In
AnnotationFileParser.convert, binary numeric promotion made theBYTEandSHORTcases produce anint, so the boxed result was anIntegerrather than aByteorShort:builderSetValuethen dispatched toAnnotationBuilder.setValue(name, (Integer) value), whosecheckSubtypethrewBugInCF: given value differs from expected; found: java.lang.Integer; expected: java.lang.Byte. So a stub file containing a byte- or short-valued annotation element, such as@Anno(1)whereAnnodeclaresbyte value(), crashed the compiler.builderSetValuealso had noBytecase, so even a correctly-typedBytefell through tothrow new BugInCF("Unexpected builder value: %s", value). Both problems had to be fixed together for a byte-valued annotation element to work at all.The jtreg test
checker/jtreg/stubs/Issue1542Driver.javanow exercises byte and short annotation elements, in both scalar and array form and with both positive and negative values (includingByte.MIN_VALUEandShort.MIN_VALUE). That test crashes without the fix and passes with it.🤖 Generated with Claude Code