On Thu, 12 May 2022 16:58:36 GMT, Jorn Vernee <jver...@openjdk.org> wrote:
>> Hi, >> >> This PR updates the VM implementation of the foreign linker, by bringing >> over commits from the panama-foreign repo. >> >> This is split off from the main JEP integration for 19, since we have >> limited resources to handle this. As such, this PR might fall over to 20, >> but it would be nice if we could get it into 19. >> >> I've written up an overview of the Linker architecture here: >> http://cr.openjdk.java.net/~jvernee/docs/FL_Overview.html it might be useful >> to read that first. >> >> This patch moves from the "legacy" implementation, to what is currently >> implemented in the panama-foreign repo, except for replacing the use of >> method handle combinators with ASM. That will come in a later path. To >> recap. This PR contains the following changes: >> >> 1. VM stubs for downcalls are now generated up front, instead of lazily by >> C2 [1]. >> 2. the VM support for upcalls/downcalls now support all possible call >> shapes. And VM stubs and Java code implementing the buffered invocation >> strategy has been removed [2], [3], [4], [5]. >> 3. The existing C2 intrinsification support for the `linkToNative` method >> handle linker was no longer needed and has been removed [6] (support might >> be re-added in another form later). >> 4. Some other cleanups, such as: OptimizedEntryBlob (for upcalls) now >> implements RuntimeBlob directly. Binding to java classes has been rewritten >> to use javaClasses.h/cpp (this wasn't previously possible due to these java >> classes being in an incubator module) [7], [8], [9]. >> >> While the patch mostly consists of VM changes, there are also some Java >> changes to support (2). >> >> The original commit structure has been mostly retained, so it might be >> useful to look at a specific commit, or the corresponding patch in the >> [panama-foreign](https://github.com/openjdk/panama-foreign/pulls?q=is%3Apr) >> repo as well. I've also left some inline comments to explain some of the >> changes, which will hopefully make reviewing easier. >> >> Testing: Tier1-4 >> >> Thanks, >> Jorn >> >> [1]: >> https://github.com/openjdk/jdk/pull/7959/commits/048b88156814579dca1f70742061ad24942fd358 >> [2]: >> https://github.com/openjdk/jdk/pull/7959/commits/2fbbef472b4c2b4fee5ede2f18cd81ab61e88f49 >> [3]: >> https://github.com/openjdk/jdk/pull/7959/commits/8a957a4ed9cc8d1f708ea8777212eb51ab403dc3 >> [4]: >> https://github.com/openjdk/jdk/pull/7959/commits/35ba1d964f1de4a77345dc58debe0565db4b0ff3 >> [5]: >> https://github.com/openjdk/jdk/pull/7959/commits/4e72aae22920300c5ffa16fed805b62ed9092120 >> [6]: >> https://github.com/openjdk/jdk/pull/7959/commits/08e22e1b468c5c8f0cfd7135c72849944068aa7a >> [7]: >> https://github.com/openjdk/jdk/pull/7959/commits/451cd9edf54016c182dab21a8b26bd8b609fc062 >> [8]: >> https://github.com/openjdk/jdk/pull/7959/commits/4c851d2795afafec3a3ab17f4142ee098692068f >> [9]: >> https://github.com/openjdk/jdk/pull/7959/commits/d025377799424f31512dca2ffe95491cd5ae22f9 > > Jorn Vernee has updated the pull request with a new target base due to a > merge or a rebase. The pull request now contains 98 commits: > > - Merge branch 'master' into JEP-19-VM-IMPL2 > - Undo spurious changes. > - Merge branch 'JEP-19-VM-IMPL2' of https://github.com/JornVernee/jdk into > JEP-19-VM-IMPL2 > - Apply copyright year updates per request of @nick-arm > > Co-authored-by: Nick Gasson <nick.gas...@arm.com> > - Fix overwritten copyright years. > - Missed 2 years > - Update Oracle copyright years > - Revert "Block async exceptions during upcalls" > > This reverts commit b29ad8f46732666f2d07e63ce8701b1eb7bed790. > - Block async exceptions during upcalls > - Merge branch 'foreign-preview-m' into JEP-19-VM-IMPL2 > - ... and 88 more: > https://git.openjdk.java.net/jdk/compare/2c5d1362...f55b6c59 Looks good. src/hotspot/cpu/aarch64/macroAssembler_aarch64.cpp line 5531: > 5529: } > 5530: > 5531: // On64 bit we will store integer like items to the stack as Missing space. src/hotspot/cpu/x86/macroAssembler_x86.cpp line 933: > 931: } else { > 932: assert(dst.is_single_reg(), "not a stack pair: (%s, %s), (%s, %s)", > 933: src.first()->name(), src.second()->name(), dst.first()->name(), > dst.second()->name()); Still not indented properly. ------------- Marked as reviewed by vlivanov (Reviewer). PR: https://git.openjdk.java.net/jdk/pull/7959
