<AWT Dev> RFR [9] Modular Source Code

Magnus Ihse Bursie magnus.ihse.bursie at oracle.com
Thu Aug 28 09:00:05 UTC 2014

On 2014-08-27 12:57, Anthony Petrov wrote:
> Hi Magnus,
> Those look like reasonable suggestions. Could you please file separate 
> bugs for each of these issues? Also, please note that most of them 
> belong to 2D, not AWT (e.g. the font-, color-, d3d-, and 
> opengl-related files) even though they're compiled into the awt native 
> libraries.

I created JDK-8056209, JDK-8056210, JDK-8056212, JDK-8056213, 
JDK-8056214, JDK-8056215, JDK-8056216 and JDK-8056217 for these. After 
some consideration, I choose to put them on the infrastructure/build 
category, since I believe the build part (changes to the makefiles) 
requires most of the work (compared to e.g. removing a file), and that 
we are probably more keen on having them solved :), but they need to be 
resolved in cooperation with the 2D team.

The issue regarding the medialib directories was already reported in 


> -- 
> best regards,
> Anthony
> On 8/25/2014 1:14 PM, Magnus Ihse Bursie wrote:
>> On 2014-08-20 11:14, Magnus Ihse Bursie wrote:
>>> On 2014-08-18 16:15, Anthony Petrov wrote:
>>>> So I'm not sure if the current set of AWT libraries could be
>>>> simplified any further.
>>>> Hope this helps.
>>> Thank you for the clarification, it was very helpful!
>>> While the set of AWT libraries probably cannot be simplified as you
>>> say, my gut feeling is still that the current layout of files on disk
>>> does not optimally match the actual libraries we build. Armed with the
>>> help of your description, I'll look into them once again and see if I
>>> can make that statement more concrete.
>> This is my suggestions based on what I found when trying to remove the
>> last unnecessary entanglement. Note that all paths are relative to the
>> java.desktop module, and  that I have at this stage only looked at
>> compiled sources (*.c), not header files.
>> * The following files are in the windows directory tree, but are
>> explicitly excluded on Windows. Thus they will never be built, and
>> should be removed instead:
>>    ./windows/native/libawt/sun/java2d/d3d/D3DPipeline.cpp
>>    ./windows/native/libawt/sun/java2d/d3d/D3DShaderGen.c
>>    ./windows/native/libawt/sun/windows/WBufferStrategy.cpp
>> * The following file is in the share directory tree, but is only used on
>> Windows. It should be moved to the corresponding windows directory 
>> instead:
>>    ./share/native/libawt/sun/java2d/ShaderList.c
>> * The following directory is in the unix directory tree, but is only
>> used on Solaris. It should be moved to the corresponding solaris
>> directory instead:
>>    ./unix/native/libawt/sun/java2d/loops
>> * The directory ./unix/native/common/sun/awt contains five more or less
>> unrelated .c files. Three of them are only used in libawt_xawt, and
>> should be moved there:
>>    ./unix/native/common/sun/awt/awt_Font.c
>>    ./unix/native/common/sun/awt/fontpath.c
>>    ./unix/native/common/sun/awt/X11Color.c
>> Of the remaining two CUPSfuncs.c seems correctly placed, since it is
>> shared between libawt_xawt and libawt_lwawt. However, I'm wondering
>> about initIDs.c. It is compiled in libawt as well as libawt_xawt, but
>> when I checked some random functions, they are exported (via the
>> mapfile) for libawt only. So I believe it is a mistake to include it in
>> libawt_xawt, and that it should be moved to the libawt directory. This
>> will need verification from someone on the AWT team.
>> * The directory ./unix/native/libjawt is included in libawt_xawt (and in
>> libjawt, of course). This seems suspicious to me. There is just a single
>> file with a single function, JAWT_GetAWT(), which is exported in libjawt
>> (via a mapfile), but not in libawt_xawt. I believe it is a mistake to
>> include it in libawt_xawt. This will need verification from someone on
>> the AWT team.
>> * All of the awt-related directories (libawt_* and common) include an
>> unnecessary extra layer, the "sun" directory. It is not needed anymore,
>> and just makes all paths extra long. I suggest that we remove that layer
>> and move everything up one step.
>> * The makefiles include too specific directories. Instead of including
>> e.g. ./*/native/common/sun/java2d/opengl and
>> ./*/native/common/sun/java2d/x11, we should just include
>> ./*/native/common/sun/java2d. This level corresponds to a logical
>> grouping of the source code, and not the directory structure in that
>> grouping.
>> * The file ./windows/native/common/awt_makecube.cpp is a bit strange. It
>> is not a shared file; instead it's a stand-alone binary with a main()
>> function. It is not compiled by any makefile targets. If this file is
>> actually used, I suggest moving it to a better location
>> (windows/native/launchers?), and starting to compile it with the build.
>> (Stuff that's not built regularly is doomed to bit rot.) It if is not
>> used, I suggest we remove it.
>> * And as I stated before, the medlialib directories are typically not
>> used by libawt and friends. It is used by libmlib_image and
>> libmlib_image_v, and should move away from the awt directory.
>> /Magnus

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