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  1. JDK
  2. JDK-8155635

C2: Mixed unsafe oop accesses break alias analysis

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    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

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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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                Assignee:
                vlivanov Vladimir Ivanov
                Reporter:
                vlivanov Vladimir Ivanov
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                  Dates

                  Created:
                  Updated:
                  Resolved: