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Bug
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Resolution: Fixed
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P3
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23, 24, 25
| Issue | Fix Version | Assignee | Priority | Status | Resolution | Resolved In Build |
|---|---|---|---|---|---|---|
| JDK-8350168 | 24.0.2 | Tobias Hartmann | P3 | Resolved | Fixed | b01 |
The attached test file TestC2Miscompile.java prints:
$ java TestC2Miscompile.java
true
true
false
false
true
true
false
true
true
true
false
true
false
true
false
true
NullPointerException: Cannot invoke "TestC2Miscompile$Class0.Class0_method1()"
true
false
false
Examination of the code shows that the receiver can never be null here. Goes away with either of -Xint or -XX:TieredStopAtLevel=3, so I think this must be a C2 bug.
Reproduced today with OracleJDK 25+5, but goes back at least half a year.
$ java TestC2Miscompile.java
true
true
false
false
true
true
false
true
true
true
false
true
false
true
false
true
NullPointerException: Cannot invoke "TestC2Miscompile$Class0.Class0_method1()"
true
false
false
Examination of the code shows that the receiver can never be null here. Goes away with either of -Xint or -XX:TieredStopAtLevel=3, so I think this must be a C2 bug.
Reproduced today with OracleJDK 25+5, but goes back at least half a year.
- backported by
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JDK-8350168 Unexpected NullPointerException in C2 compiled code due to ReduceAllocationMerges
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- Resolved
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- relates to
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JDK-8316991 Reduce nullable allocation merges
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- Resolved
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- links to
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Commit(master)
openjdk/jdk24u/d8feb0f3
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Commit(master)
openjdk/jdk/9f4d3de4
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Review(master)
openjdk/jdk24u/65
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Review(master)
openjdk/jdk/23312
(1 links to)