RFR: 8279699: Parallel: More precise boundary in ObjectStartArray::object_starts_in_range

[Stefan Johansson]

On Mon, 10 Jan 2022 15:50:21 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple change in boundary condition checking and updating the API doc.
> 
> Test: hotspot_gc

src/hotspot/share/gc/parallel/objectStartArray.hpp line 172:

> 170:   // where
> 171:   //   start_addr_aligned_down = align_down(start_addr, _card_size)
> 172:   //   end_addr_aligned_up = align_up(end_addr, _card_size)

The code doesn't do align_down on start, but looking at the callers it looks like start_addr will always be card size aligned. Would it make sense to assert this?

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PR: https://git.openjdk.java.net/jdk/pull/7012