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  1. JDK
  2. JDK-8155635

C2: Mixed unsafe oop accesses break alias analysis

    Details

    • Type: Bug
    • Status: Closed
    • Priority: P1
    • Resolution: Fixed
    • Affects Version/s: 9
    • Fix Version/s: 9
    • Component/s: hotspot
    • Labels:
    • Subcomponent:
    • Resolved In Build:
      b137
    • Verification:
      Verified

      Backports

        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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                • Assignee:
                  vlivanov Vladimir Ivanov
                  Reporter:
                  vlivanov Vladimir Ivanov
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                  Dates

                  • Created:
                    Updated:
                    Resolved: