RFR(M) 8072383: resolve conflicts between open and closed ports

[Volker Simonis]

I've tested the jdk9 patch now and it's good that I did it :)

It works on AIX [3] but there's a subtle problem in your patch which
lets the build fail on Linux/ppc64 (and caused my quite some headache
:)

The failure is because of a peculiarity introduced by 8046471 [1,2]
(done by Mikael which is on CC now). After that change ARCH will be
set to "ppc" for complete top-level builds but it will be "ppc64" for
hotspot-only builds started from the hotspot/make subdirectory. I
don't remember the exact reasoning why 8046471 changed the value of
OPENJDK_TARGET_CPU_ARCH from "ppc64" to "ppc" spec.gmk (maybe Mikael
can help) which finally led to the definition of ARCH=ppc in
hotspot-spec.gmk.

But because of that change, which was only applied to jdk9 and not
down-ported to jdk8u, the build now fails on Linux/ppc64 with your
change applied. It can be easily fixed by the following small patch
(which actually just reverts two of your changes):

 diff -r f1881e4d4ad6 make/defs.make
--- a/make/defs.make    Fri Feb 20 14:53:58 2015 +0100
+++ b/make/defs.make    Fri Feb 20 18:17:27 2015 +0100
@@ -286,7 +286,7 @@

   # Use uname output for SRCARCH, but deal with platform differences. If ARCH
   # is not explicitly listed below, it is treated as x86.
-  SRCARCH    ?= $(ARCH/$(filter sparc sparc64 ia64 amd64 x86_64 ppc64
aarch64 zero,$(ARCH)))
+  SRCARCH    ?= $(ARCH/$(filter sparc sparc64 ia64 amd64 x86_64 ppc
ppc64 aarch64 zero,$(ARCH)))
   ARCH/       = x86
   ARCH/sparc  = sparc
   ARCH/sparc64= sparc
@@ -294,6 +294,7 @@
   ARCH/amd64  = x86
   ARCH/x86_64 = x86
   ARCH/ppc64  = ppc
+  ARCH/ppc    = ppc
   ARCH/aarch64= aarch64
   ARCH/zero   = zero

I'd propose to incorporate this small patch into your change. If
that's not acceptable for you, we would have to change the top-level
arch-detection and possibly revert 8046471 for ppc which seems much
more complicated to me.

Regards,
Volker

[1] https://bugs.openjdk.java.net/browse/JDK-8046471
[2] http://hg.openjdk.java.net/jdk9/hs-rt/hotspot/rev/0a039fc78645
[3] because we unconditionally set ARCH to "ppc64" in
make/aix/makefiles/defs.make and ignore the ARCH value from the
top-level hotspot-spec.gmk file.

On Fri, Feb 20, 2015 at 2:32 PM, Volker Simonis
<volker.simonis at gmail.com> wrote:
> Hi Dean,
>
> I've only looked at the 8u60 changes until now but it's actually a
> good idea to also check the aarch-stage repo on our platforms.
> I'll run the builds and let you know.
>
> Regards,
> Volker
>
>
> On Thu, Feb 19, 2015 at 10:40 PM, Dean Long <dean.long at oracle.com> wrote:
>> Thanks Volker, I will list you as a reviewer for 8u60.  Did you also look at
>> the 9
>> changes?  If so I will list you as a reviewer for 9 as well.
>>
>> dl
>>
>>
>> On 2/19/2015 2:27 AM, Volker Simonis wrote:
>>>
>>> Hi Dean,
>>>
>>> I've just checked webrev.8u60.01 on Linux/PPC64. It cleanly builds and
>>> runs so thumbs up from me.
>>>
>>> Regards,
>>> Volker
>>>
>>>
>>> On Thu, Feb 19, 2015 at 5:12 AM, Dean Long <dean.long at oracle.com> wrote:
>>>>
>>>> Yes, good catch.  I've update the webrev to webrev.8u60.01.  Thanks for
>>>> the
>>>> review.
>>>>
>>>> dl
>>>>
>>>>
>>>> On 2/18/2015 4:45 PM, Vladimir Kozlov wrote:
>>>>>
>>>>> Did you missed to remove #elif ppc_32 in 8u60 changes in
>>>>> src/share/vm/interpreter/templateTable.hpp?
>>>>>
>>>>> Otherwise both versions look good.
>>>>>
>>>>> Thanks,
>>>>> Vlaidmir
>>>>>
>>>>> On 2/18/15 4:26 PM, Dean Long wrote:
>>>>>>
>>>>>> Just to avoid confusion, let me clarify that the jdk9 changes below
>>>>>> can't be pushed until after the open aarch64 port is merged into the
>>>>>> main jdk9, as they are based on the staging repo.
>>>>>>
>>>>>> dl
>>>>>>
>>>>>> On 2/18/2015 4:02 PM, Dean Long wrote:
>>>>>>>
>>>>>>> These changes resolve some issues with references to closed ports in
>>>>>>> open hotspot code,
>>>>>>> primarily by removing those references completely.  I have included
>>>>>>> the 8u60 backport
>>>>>>> as well because it won't apply cleanly, and I may push it first
>>>>>>> because the 9 changes are
>>>>>>> blocked by JEP 237: Linux/AArch64 Port.
>>>>>>>
>>>>>>> http://cr.openjdk.java.net/~dlong/8072383/webrev.8u60.00/
>>>>>>> http://cr.openjdk.java.net/~dlong/8072383/webrev.9.00/
>>>>>>>
>>>>>>> dl
>>>>>>
>>>>>>
>>