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  1. JDK
  2. JDK-8155635

C2: Mixed unsafe oop accesses break alias analysis

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Details

    • Bug
    • Resolution: Fixed
    • P1
    • 9
    • 9
    • hotspot
    • b137
    • Verified

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      Description

        Unsafe accesses can produce untyped pointers:

        # Internal Error (/Users/vlivanov/ws/jdk/hs-comp9/hotspot/src/share/vm/opto/compile.cpp:1712), pid=61943, tid=22531
        # assert(flat != TypePtr::BOTTOM) failed: cannot alias-analyze an untyped ptr

        ILW = MLH = P4
        I = M: assert
        L = L: observed only with modified JVM
        W = H: no workaround

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                vlivanov Vladimir Ivanov
                vlivanov Vladimir Ivanov
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                  Created:
                  Updated:
                  Resolved: