Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-8273392

Improve usability of stack-less exceptions due to -XX:+OmitStackTraceInFastThrow

    XMLWordPrintable

Details

    • Enhancement
    • Resolution: Unresolved
    • P4
    • tbd
    • 18, 19
    • hotspot
    • Fix Understood
    • generic
    • generic

    Description

      If running with -XX:+OmitStackTraceInFastThrow (which is the default) C2 will optimize certain "hot" implicit exceptions (i.e. AIOOBE, NullPointerExceptions,..) and replace them by a static, pre-allocated exception without any stacktrace.

      However, we can actually do better. Instead of using a single, pre-allocated exception object for all method we can let the compiler allocate specific exceptions for each method and fill them with at least one stack frame with the method /line-number information of the currently compiled method. If the method in question is being inlined, we can add stackframes for all callers up to the inlining depth of the method in question.

      This optimization comes at no run-time costs because all the extra work will be done at compile time.

      Attachments

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. JDK-8169685 C2: ClassCastException with empty message

          • P3 - Major loss of function.
          • Closed

          Enhancement - null JDK-8046503 Ability to reset OmitStackTraceInFastThrow counter

          • P3 - Major loss of function.
          • Open

          Enhancement - null JDK-8273563 Improve performance of implicit exceptions with -XX:-OmitStackTraceInFastThrow

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • In Progress

          Enhancement - null JDK-4292742 NullPointerException with no stack trace

          • P3 - Major loss of function.
          • Resolved

          Enhancement - null JDK-8073432 Object.getClass() throws stackless NPE, due to C2 intrinsic

          • P3 - Major loss of function.
          • Resolved
          links to

          Review Review openjdk/jdk/5392

          Activity

            People

              simonis Volker Simonis
              simonis Volker Simonis
              Votes:
              0 Vote for this issue
              Watchers:
              3 Start watching this issue

              Dates

                Created:
                Updated: