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  1. JDK
  2. JDK-8300197

Freeze/thaw an interpreter frame using a single copy_to_chunk() call

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    • Enhancement
    • Resolution: Fixed
    • P4
    • 21
    • 21
    • hotspot
    • b21

    Description

      On certain architectures (like AARCH64) padding may be inserted between the locals and the rest of the stack frame in order to keep the frame pointer 16-byte-aligned.

      This padding is currently not freezed, instead freezing of a single interpreter stack frame is done using two separate copy_to_chunk() calls (see recurse_freeze_interpreted_frame). Likewise, thawing is done using two separate copy_from_chunk() calls.

      This poses a bit of a problem when trying to relativize stack addresses in interpreter frames (JDK-8289296). Since relative offsets may need to be changed during freezing and thawing.

      By both freezing and thawing the padding we remove the need to change any relative offsets in runtime.

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              fbredberg Fredrik Bredberg
              fbredberg Fredrik Bredberg
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                Updated:
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