[Bug java/53982] New: gij built for x32 can't run a simple Hello World class

[Bug java/53982] New: gij built for x32 can't run a simple Hello World class

[dschepler at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53982

             Bug #: 53982
           Summary: gij built for x32 can't run a simple Hello World class
    Classification: Unclassified
           Product: gcc
           Version: 4.7.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: java
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: dschepler@gmail.com


Built and installed gcc from hjl/x32/gcc-4_7-branch (in a test chroot), after
running "git merge origin/branches/gcc-4_7-branch", using
../src/configure --prefix=/usr --with-abi=mx32 --enable-languages=c,c++,java

With this configuration, I imported a HelloWorld.class file built outside the
chroot (since "gcj -C HelloWorld.java" inside the chroot complains about
missing ecj1), and tried running "gij HelloWorld".  This gave an error:
Exception in thread "main" java.lang.NullPointerException
   at java.lang.String.charAt(libgcj.so.13)
   at gnu.gcj.convert.Output_ASCII.write(libgcj.so.13)
   at java.io.PrintStream.writeChars(libgcj.so.13)
   at java.io.PrintStream.print(libgcj.so.13)
   at java.io.PrintStream.println(libgcj.so.13)
   at HelloWorld.main(HelloWorld.java:3)

The Java source is just the prototypical Java hello-world example:
public class HelloWorld {
    public static void main(String args[]) {
        System.out.println("Hello World!");
    }
}

On the other hand, if I compile the .class file into a native executable using
"gcj -O2 HelloWorld.class --main=HelloWorld -o ./HelloWorld"
then that executable runs just fine.

But I'm not entirely convinced gcj-compiled native executables work without
problems, either.  For example, with ecj compiled from the Debian libecj-java
binary package's jar file into native code, I can run gcj -C HelloWorld.java OK
in the Debian x32 chroot I'm bootstrapping.  But on most source packages of any
size, it bails out sooner or later with a heap corruption message
ecj1: arena.c:661: heap_trim: Assertion `p->size == (0|0x1)' failed.
gcj-4.7: internal compiler error: Aborted (program ecj1)

[Bug java/53982] gij built for x32 can't run a simple Hello World class

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53982

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2012-07-16
     Ever Confirmed|0                           |1

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> 2012-07-16 14:53:25 UTC ---
Please show us how to reproduce it.

[Bug java/53982] gij built for x32 can't run a simple Hello World class

[dschepler at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53982

--- Comment #2 from Daniel Schepler <dschepler at gmail dot com> 2012-07-16 15:53:41 UTC ---
(In reply to comment #1)
> Please show us how to reproduce it.

I assume you mean the heap corruption issue in ecj1?  To pick a Debian package
at random which is running into this... download the source package from
http://ftp.egr.msu.edu/debian/pool/main/libj/libjpedal-jbig2-java/libjpedal-jbig2-java_20100117.orig.tar.gz
and unpack.  Then run
gcj -C -Wall `find org -name *.java | LC_COLLATE=C sort`

Here, the output ends with
org/jpedal/jbig2/decoders/MMRDecoder.java:189: warning: The declared exception
IOException is not acecj1: arena.c:661: heap_trim: Assertion `p->size ==
(0|0x1)' failed.
gcj: internal compiler error: Aborted (program ecj1)
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcj-4.7/README.Bugs> for instructions.

[Bug java/53982] gij built for x32 can't run a simple Hello World class

[dschepler at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53982

--- Comment #3 from Daniel Schepler <dschepler at gmail dot com> 2012-07-16 16:04:47 UTC ---
Update on comment #2:

Running through the java files one at a time, I found that just
gcj -C -Wall org/jpedal/jbig2/examples/viewer/NavigationToolbar.java
fails by itself.  The first time, it creates a bunch of dependent .class files
and outputs warnings for the sources, but subsequent times, I get just

ecj1: arena.c:661: heap_trim: Assertion `p->size == (0|0x1)' failed.
gcj: internal compiler error: Aborted (program ecj1)
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcj-4.7/README.Bugs> for instructions.

But oddly, that's not 100% reproducible.  When I just ran that command 10 times
in a row, it failed 6 times out of the 10.

[Bug java/53982] gij built for x32 can't run a simple Hello World class

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53982

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |NEW
                URL|                            |http://gcc.gnu.org/ml/gcc-p
                   |                            |atches/2012-07/msg00686.htm
                   |                            |l

--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> 2012-07-16 20:15:23 UTC ---
A patch is posted at

http://gcc.gnu.org/ml/gcc-patches/2012-07/msg00686.html

[Bug java/53982] gij built for x32 can't run a simple Hello World class

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53982

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |DUPLICATE

--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> 2012-07-18 19:13:30 UTC ---
Dup.

*** This bug has been marked as a duplicate of bug 53973 ***

[Bug java/53982] gij built for x32 can't run a simple Hello World class

[hjl at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53982

--- Comment #6 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> 2012-07-18 19:19:40 UTC ---
Author: hjl
Date: Wed Jul 18 19:19:34 2012
New Revision: 189626

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=189626
Log:
Define FFI_SIZEOF_JAVA_RAW to 4 for x32


    PR libffi/53982
    PR libffi/53973
    * src/x86/ffitarget.h: Check __ILP32__ instead of __LP64__ for
    x32.
    (FFI_SIZEOF_JAVA_RAW): Defined to 4 for x32.

Modified:
    trunk/libffi/ChangeLog.libgcj
    trunk/libffi/src/x86/ffitarget.h