Reuse a static field's tag id instead of reallocating it - #843
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(Reported by CodeRabbit in review of PR 838) build_field_to_offset_map walks the superclass chain, so it revisits a superclass's static fields once for every subclass that is instrumented. Outside the JDK build it allocated a new id each time, leaving the accessors already emitted for the declaring class reading a different DCRuntime.static_tags slot than those emitted for the subclass: one field's tag split across two slots. The JDK-build branch already checked for an existing id; do the same here. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01A1De2wQi77Zz4pnapvnFJz
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In `@java/daikon/dcomp/DCInstrumentTest24.java`:
- Around line 2809-2810: Update
superclassStaticFieldKeepsItsIdWhenSubclassIsInstrumented to snapshot
DCInstrument24.static_field_id and DCRuntime.static_tags, clear static_field_id
before instrumentation, and restore both collections in its finally block
alongside the existing instrumentation flags.
- Around line 2809-2818: Extend the relevant superclass/subclass static-field
test to repeat the base-then-derived instrumentation assertion using
DCInstrument, not only DCInstrument24. After instrumenting the base class,
verify DCInstrument.static_field_id contains the expected key and retain the
derived-class instrumentation assertion, matching the existing idAfterBase
validation.
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java/daikon/dcomp/DCInstrument.javajava/daikon/dcomp/DCInstrument24.javajava/daikon/dcomp/DCInstrumentTest24.java
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Restore the global allocation state the test touches: instrumenting adds to static_field_id and grows DCRuntime.static_tags, neither of which was reset. Clearing the map first also makes the ids independent of what earlier tests allocated. Add the same check against DCInstrument. The two instrumenters have separate copies of both the allocation logic and the map, so testing one does not cover the other; reverting the fix in DCInstrument alone now fails only the new test. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01A1De2wQi77Zz4pnapvnFJz
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(Reported by CodeRabbit in review of PR 838)
build_field_to_offset_map walks the superclass chain, so it revisits a superclass's static fields once for every subclass that is instrumented. Outside the JDK build it allocated a new id each time, leaving the accessors already emitted for the declaring class reading a different DCRuntime.static_tags slot than those emitted for the subclass: one field's tag split across two slots. The JDK-build branch already checked for an existing id; do the same here.
Claude-Session: https://claude.ai/code/session_01A1De2wQi77Zz4pnapvnFJz