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  1. JDK
  2. JDK-8038447

WB API should support multi version of nmethod

    Details

    • Type: Enhancement
    • Status: Open
    • Priority: P4
    • Resolution: Unresolved
    • Affects Version/s: 9, 11
    • Fix Version/s: tbd
    • Component/s: hotspot

      Description

      On 03/26/2014 01:01 AM, John Rose wrote:
      > The boolean parameter is not expressive enough. It will have to change as soon as we have more than two versions of a method.
      >
      > (In fact, we already do: There is potentially a different OSR method for each entry point BCI. The formulation you have returns just one of them.)
      >
      > I suggest you change "boolean isOsr" in the WB API to "long version" or even "Object version". The version enumeration can be evolved over time. Values 0 and 1 can be "normal at current compilation" and "first available OSR".
      >
      > Also, put the version number into the NMethod structure, so it can be requeried. For an OSR method, the entry BCI is important to know.
      >
      > ...But I see that there is already a use of booleans like this in the WB API. So I guess you should consistent with what you have.
      >
      > I filed a bug to track this issue of method versioning; there is technical debt here:
      > https://bugs.openjdk.java.net/browse/JDK-8038356
      >
      > — John

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              • Assignee:
                Unassigned
                Reporter:
                iignatyev Igor Ignatyev
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                • Created:
                  Updated: