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  1. JDK
  2. JDK-8217874

Shenandoah: AArch64: Clobbered register in ShenandoahBarrierSetAssembler::cmpxchg_oop()

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    Details

    • Subcomponent:
    • Introduced In Version:
      13
    • Resolved In Build:
      b08
    • CPU:
      aarch64
    • OS:
      generic

      Backports

        Description

        When called from C2, in ShenandoahBarrierSetAssembler::cmpxchg_oop() the result register may overlap with other input argument registers and thus fail the leading assert, and lead to clobbered registers. In the body of the code block, a temporary register should be used instead, and result should only get filled in at the end.

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            backported by

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8219670 Shenandoah: AArch64: Clobbered register in ShenandoahBarrierSetAssembler::cmpxchg_oop()

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

            Enhancement - null JDK-8217016 Shenandoah: Streamline generation of CAS barriers

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

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                Assignee:
                rkennke Roman Kennke
                Reporter:
                rkennke Roman Kennke
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                  Dates

                  Created:
                  Updated:
                  Resolved: