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  1. JDK
  2. JDK-8241825

Make compressed oops and compressed class pointers independent (x86_64, PPC, S390)

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Details

    • Enhancement
    • Status: Resolved
    • P4
    • Resolution: Fixed
    • None
    • 15
    • hotspot
    • gc
    • b23

    Description

      Today, the use of compressed class pointers assumes the use of compressed oops. This is an unnecessary restriction that for example causes each object to waste 32 bits with ZGC. The restriction should be removed.

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        Issue Links

          relates to

          Enhancement - null JDK-8244943 Improve Class Space placement

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

          Enhancement - null JDK-8246689 [aarch64] Enable independent compressed oops/class ptrs on Aarch64

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

          Enhancement - null JDK-8253910 UseCompressedClassPointers depends on UseCompressedOops in vmError.cpp

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

          Enhancement - null JDK-8259368 Zero: UseCompressedClassPointers does not depend on UseCompressedOops

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8244971 Zero VM is broken after JDK-8241825 (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS not defined)

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8283249 CompressedClassPointers.java fails on ppc with 'Narrow klass shift: 0' missing

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8277172 Remove stray comment mentioning instr_size_for_decode_klass_not_null on x64

          • P5 - Cosmetic problem like misspelt words or misaligned text.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-8254252 Generic arraycopy stub overwrites callee-save rdi register on 64-bit Windows

          • P2 - Crashes, loss of data, severe memory leak.
          • Closed

          Enhancement - null JDK-8221249 x86: make r12_heapbase register available when compressed oops do not require it

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

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              eosterlund Erik Österlund
              eosterlund Erik Österlund
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              Dates

                Created:
                Updated:
                Resolved: