RFR(L) - 2nd round: 8024854: Basic changes and files to build the class library on AIX

Volker Simonis volker.simonis at gmail.com
Wed Nov 20 10:26:35 PST 2013


Hi,

this is the second review round for "8024854: Basic changes and files to
build the class library on
AIX<https://bugs.openjdk.java.net/browse/JDK-8024854>".
The previous reviews can be found at the end of this mail in the references
section.

I've tried to address all the comments and suggestions from the first round
and to further streamline the patch (it perfectly builds on Linux/x86_64,
Linux/PPC664, AIX, Solaris/SPARC and Windows/x86_64). The biggest change
compared to the first review round is the new "aix/" subdirectory which
I've now created under "jdk/src" and which contains AIX-only code.

The webrev is against our
http://hg.openjdk.java.net/ppc-aix-port/stagerepository which has been
recently synchronised with the jdk8 master:

http://cr.openjdk.java.net/~simonis/webrevs/8024854.v2/

Below (and in the webrev) you can find some comments which explain the
changes to each file. In order to be able to push this big change, I need
the approval of reviewers from the lib, net, svc, 2d, awt and sec groups.
So please don't hesitate to jump at it - there are enough changes for
everybody:)

Thank you and best regards,
Volker

*References:*

The following reviews have been posted so far (thanks Iris for collecting
them :)

- Alan Bateman (lib): Initial comments (16 Sep [2])
- Chris Hegarty (lib/net): Initial comments (20 Sep [3])
- Michael McMahon (net): Initial comments (20 Sept [4])
- Steffan Larsen (svc): APPROVED (20 Sept [5])
- Phil Race (2d): Initial comments  (18 Sept [6]); Additional comments (15
Oct [7])
- Sean Mullan (sec): Initial comments (26 Sept [8])

[2]:
http://mail.openjdk.java.net/pipermail/ppc-aix-port-dev/2013-September/001045.html
[3]:
http://mail.openjdk.java.net/pipermail/ppc-aix-port-dev/2013-September/001078.html
[4]:
http://mail.openjdk.java.net/pipermail/ppc-aix-port-dev/2013-September/001079.html
[5]:
http://mail.openjdk.java.net/pipermail/ppc-aix-port-dev/2013-September/001077.html
[6]:
http://mail.openjdk.java.net/pipermail/ppc-aix-port-dev/2013-September/001069.html
[7]: http://mail.openjdk.java.net/pipermail/2d-dev/2013-October/003826.html
[8]:
http://mail.openjdk.java.net/pipermail/ppc-aix-port-dev/2013-September/001081.html


*Detailed change description:*

The new "jdk/src/aix" subdirectory contains the following new and
AIX-specific files for now:

 src/aix/classes/sun/awt/fontconfigs/aix.fontconfig.properties
 src/aix/classes/sun/nio/ch/AixAsynchronousChannelProvider.java
 src/aix/classes/sun/nio/ch/AixPollPort.java
 src/aix/classes/sun/nio/fs/AixFileStore.java
 src/aix/classes/sun/nio/fs/AixFileSystem.java
 src/aix/classes/sun/nio/fs/AixFileSystemProvider.java
 src/aix/classes/sun/nio/fs/AixNativeDispatcher.java
 src/aix/classes/sun/tools/attach/AixAttachProvider.java
 src/aix/classes/sun/tools/attach/AixVirtualMachine.java
 src/aix/native/java/net/aix_close.c
 src/aix/native/sun/nio/ch/AixPollPort.c
 src/aix/native/sun/nio/fs/AixNativeDispatcher.c
 src/aix/native/sun/tools/attach/AixVirtualMachine.c
 src/aix/porting/porting_aix.c
 src/aix/porting/porting_aix.h

src/aix/porting/porting_aix.c
src/aix/porting/porting_aix.h

   - Added these two files for AIX relevant utility code.
   - Currently these files only contain an implementation of dladdr which
   is not available on AIX.
   - In the first review round the existing dladdr users in the code either
   called the version from the HotSpot on AIX (
   src/solaris/native/sun/awt/awt_LoadLibrary.c) or had a private copy of
   the whole implementation (src/solaris/demo/jvmti/hprof/hprof_md.c). This
   is now not necessary any more.

 The new file layout required some small changes to the makefiles to make
them aware of the new directory locations:

makefiles/CompileDemos.gmk

   - Add an extra argument to SetupJVMTIDemo which can be used to pass
   additional source locations.
   - Currently this is only used on AIX for the AIX porting utilities which
   are required by hprof.

makefiles/lib/Awt2dLibraries.gmk
makefiles/lib/ServiceabilityLibraries.gmk

   - On AIX add the sources of the AIX porting utilities to the build. They
   are required by src/solaris/native/sun/awt/awt_LoadLibrary.c and
   src/solaris/demo/jvmti/hprof/hprof_md.c because dladdr is not available
   on AIX.

makefiles/lib/NioLibraries.gmk

   - Make the AIX-build aware of the new NIO source locations under
   src/aix/native/sun/nio/.

makefiles/lib/NetworkingLibraries.gmk

   - Make the AIX-build aware of the new aix_close.c source location under
   src/aix/native/java/net/.

src/share/bin/jli_util.h

   - Define JLI_Lseek on AIX.

src/share/lib/security/java.security-aix

   - Provide default java.security-aix for AIX based on the latest Linux
   version as suggested by Sean Mullan.

src/share/native/common/check_code.c

   - On AIX malloc(0) and calloc(0, ...) return a NULL pointer, which is
   legal, but the code in check_code.c does not handles this properly. So
   we wrap the two methods on AIX and return a non-NULL pointer even if we
   allocate 0 bytes.

src/share/native/sun/awt/medialib/mlib_sys.c

   - malloc always returns 8-byte aligned pointers on AIX as well.

src/share/native/sun/awt/medialib/mlib_types.h

   - Add AIX to the list of known platforms.

src/share/native/sun/font/layout/KernTable.cpp

   - Rename the macro DEBUG to DEBUG_KERN_TABLE because DEBUG is too common
   and may be defined in other headers as well as on the command line and
   xlc bails out on macro redefinitions with a different value.

src/share/native/sun/security/ec/impl/ecc_impl.h

   - Define required types and macros on AIX.

src/solaris/back/exec_md.c

   - AIX behaves like Linux in this case so check for it in the Linux
   branch.

src/solaris/bin/java_md_solinux.c,
src/solaris/bin/java_md_solinux.h

   - On AIX LD_LIBRARY_PATH is called LIBPATH
   - Always use LD_LIBRARY_PATH macro instead of using the string "
   LD_LIBRARY_PATH" directly to cope with different library path names.
   - Add jre/lib/<arch>/jli to the standard library search path on AIX
   because the AIX linker doesn't support the -rpath option.
   - Replace #ifdef __linux__ by #ifndef __solaris__ because in this case,
   AIX behaves like Linux.
   - Removed the definition of JVM_DLL, JAVA_DLL and LD_LIBRARY_PATH from
   java_md_solinux.h because the macros are redefined in the corresponding
   .c files anyway.

src/aix/classes/sun/awt/fontconfigs/aix.fontconfig.properties

   - Provide basic fontconfig.propertiesfor AIX.

src/solaris/classes/java/lang/UNIXProcess.java.aix,
src/aix/classes/sun/tools/attach/AixAttachProvider.java,
src/aix/classes/sun/tools/attach/AixVirtualMachine.java,
src/aix/native/sun/tools/attach/AixVirtualMachine.c

   - Provide AIX specific Java versions, mostly based on the corresponding
   Linux versions.

src/solaris/classes/sun/nio/ch/DefaultAsynchronousChannelProvider.java
src/solaris/classes/sun/nio/fs/DefaultFileSystemProvider.java

   - Detect AIX operating system and return the corresponding channel and
   file system providers.

src/solaris/classes/sun/nio/ch/Port.java

   - Add a callback function unregisterImpl(int fd) for implementations
   that need special handling when fd is removed and call it from
unregister(int
   fd). By default the implementation of unregisterImpl(int fd) is empty
   except for the derived AixPollPort class on AIX.

src/solaris/demo/jvmti/hprof/hprof_md.c

   - Add AIX support. AIX mostly behaves like Linux, with the one exception
   that it has no dladdr functionality.
   - Use the dladdr implementation from porting_aix.{c,h} on AIX.

src/solaris/native/com/sun/management/UnixOperatingSystem_md.c

   - Adapt for AIX (i.e. use libperfstat on AIX to query OS memory).

src/solaris/native/common/jdk_util_md.h

   - Add AIX definitions of the ISNANF and ISNAND macros.

src/solaris/native/java/io/io_util_md.c

   - AIX behaves like Linux in this case so check for it in the Linux
   branch.

src/solaris/native/java/lang/UNIXProcess_md.c

   - AIX behaves mostly like Solraris in this case so adjust the ifdefs
   accordingly.

src/solaris/native/java/lang/childproc.c

   - AIX does not understand '/proc/self' - it requires the real process ID
   to query the proc file system for the current process.

src/solaris/native/java/net/NetworkInterface.c

   - Add AIX support into the Linux branch because AIX mostly behaves like
   AIX for IPv4.
   - AIX needs a special function to enumerate IPv6 interfaces and to query
   the MAC address.
   - Moved the declaration of siocgifconfRequest to the beginning a the
   function (as recommend by Michael McMahon) to remain C89 compatible.

src/solaris/native/java/net/PlainSocketImpl.c

   - On AIX (like on Solaris) setsockopt will set errno to EINVAL if the
   socket is closed. The default error message is then confusing.

src/aix/native/java/net/aix_close.c,
src/share/native/java/net/net_util.c

   - As recommended by Michael McMahon and Alan Bateman I've move an
   adapted version of linux_close.c to
src/aix/native/java/net/aix_close.cbecause we also need the file and
socket wrappers on AIX.
   - Compared to the Linux version, we've added the initialization of some
   previously uninitialized data structures.
   - Also, on AIX we don't have __attribute((constructor)) so we need to
   initialize manually (from JNI_OnLoad() in
   src/share/native/java/net/net_util.c.

src/solaris/native/java/net/net_util_md.h

   - AIX needs the same workaround for I/O cancellation like Linux and
   MacOSX.

src/solaris/native/java/net/net_util_md.c

   - SO_REUSEADDR is called SO_REUSEPORT on AIX.
   - On AIX we have to ignore failures due to ENOBUFS when setting the
   SO_SNDBUF/SO_RCVBUF socket options.

src/solaris/native/java/util/TimeZone_md.c

   - Currently on AIX the only way to get the platform time zone is to read
   it from the TZ environment variable.

src/solaris/native/sun/awt/awt_LoadLibrary.c

   - Use the dladdr from porting_aix.{c,h} on AIX.

src/solaris/native/sun/awt/fontpath.c

   - Changed some macros from if !defined(__linux__) to if
   defined(__solaris__) because that's their real meaning.
   - Add AIX specific fontpath settings and library search paths for
   libfontconfig.so.

src/solaris/native/sun/java2d/x11/X11SurfaceData.c

   - Rename the MIN and MAX macros to XSD_MIN and XSD_MAX to avoid name
   clashes (MIN and MAX are much too common and thexy are already defined
   in some AIX system headers).

src/solaris/native/sun/java2d/x11/XRBackendNative.c

   - Handle AIX like Solaris.

src/solaris/native/sun/nio/ch/Net.c

   - Add AIX-specific includes and constant definitions.
   - On AIX "socket extensions for multicast source filters" support
   depends on the OS version. Check for this and throw appropriate exceptions
   if it is requested but not supported. This is needed to pass
   JCK-api/java_nio/channels/DatagramChannel/DatagramChannel.html#Multicast

src/solaris/native/sun/nio/fs/UnixNativeDispatcher.c

   - On AIX strerror() is not thread-safe so we have to use strerror_r()instead.
   - On AIX readdir_r() returns EBADF (i.e. '9') and sets 'result' to NULL
   for the directory stream end. Otherwise, 'errno' will contain the error
   code.
   - Handle some AIX corner cases for the results of the statvfs64() call.
   - On AIX getgrgid_r() returns ESRCH if group does not exist.

src/solaris/native/sun/security/pkcs11/j2secmod_md.c

   - Use RTLD_LAZY instead of RTLD_NOLOAD on AIX.

test/java/lang/ProcessBuilder/Basic.java
test/java/lang/ProcessBuilder/DestroyTest.java

   - Port this test to AIX and make it more robust (i.e. recognize the "C"
   locale as isEnglish(), ignore VM-warnings in the output, make sure the
   "grandchild" processes created by the test don't run too long (60s vs.
   6666s) because in the case of test problems these processes will pollute
   the process space, make sure the test fails with an error and doesn't hang
   indefinitley in the case of a problem).

 *Q (Michael McMahon):* Seems to be two macros _AIX and AIX. Is this
intended?

Well, _AIX is defined in some system headers while AIX is defined by the
build system. This is already used inconsistently (i.e. __linux__ vs. LINUX)
and in general I try to be consistent with the style of the file where I
the changes are. That said, I changes most of the occurences of AIX to _AIX.


*Q (Alan Bateman):* There are a few changes for OS/400 in the patch, are
they supposed to be there?

We currently don't support OS/400 (later renamed into i5/OS and currently
called IBM i) in our OpenJDK port but we do support it in our internel, SAP
JVM build. We stripped out all the extra OS/400 functionality from the port
but in some places where there is common functionality needd by both, AIX
and OS/400 the OS/400 support may still be visible in the OpenJDK port. I
don't think this is a real problem and it helps us to keep our internel
sources in sync with the OpenJDK port. That said, I think I've removed all
the references to OS/400 now.
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