RFR: 8280872: Reorder code cache segments to improve code density [v8]

[Vladimir Kozlov]

On Mon, 28 Mar 2022 20:57:17 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Boris Ulasevich has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains eight commits:
>> 
>>  - Merge branch 'openjdk:master' into codecache_segments_order
>>  - review findings: use instruction_size istead of raw constant, strengthen the assert, check alignment, move comments, segments order: profiled - non_method - non_profiled
>>  - rename, adding test
>>  - moving nops out of far_jump
>>  - minor renaming
>>  - review comments. remove far_call limit. undo trampoline-to-farcall. add trampoline_needs_far_jump func
>>  - fix name: is_non_nmethod, adding target_needs_far_branch func
>>  - change codecache segments order: nonprofiled-nonmethod-profiled
>>    increase far jump threshold: sideof(codecache)=128M -> sizeof(nonprofiled+nonmethod)=128M
>
> test/hotspot/jtreg/compiler/c2/aarch64/TestFarJump.java line 41:
> 
>> 39:  * @requires vm.compiler2.enabled
>> 40:  *
>> 41:  * @run driver compiler.c2.TestFarJump
> 
> Package name `compiler.c2.aarch64` is different from `compiler.c2.TestFarJump`.
> Got testing failure:
> 
> java.lang.ClassNotFoundException: compiler.c2.TestFarJump
> 	at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:445)

After I fixed test name I got next failure:

[Exception Handler]
  0x0000fffe40140490: b3d5 9bd2 | 4201 80d2 | a4d5 9bd2 | a5d5 9bd2 

----------System.err:(11/622)----------
java.lang.RuntimeException: ADRP instruction is expected on far jump
	at compiler.c2.aarch64.TestFarJump.runVM(TestFarJump.java:112)
	at compiler.c2.aarch64.TestFarJump.main(TestFarJump.java:126)

-------------

PR: https://git.openjdk.java.net/jdk/pull/7517