[Bug c++/53061] [C/ObjC/C++/ObjC++] cleanup diagnostics initialization

["manu at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53061

--- Comment #2 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Author: manu
Date: Sun Oct 26 21:21:58 2014
New Revision: 216720

URL: https://gcc.gnu.org/viewcvs?rev=216720&root=gcc&view=rev
Log:
In cp/error.c, I separate the initialization of the diagnostic context
from the initialization of the scratch pretty-printer (cxx_pp).  This
was suggested by Gabriel in the last review of the patch and now I
realize it was a good idea. Now cxx_initialize_diagnostics is the
equivalent version of c_initialize_diagnostics.  To avoid having to
make extern a bunch of functions, I moved it from cp-objcp-common.c to
error.c.

I moved the setting of diagnostic_format_decoder (global_dc) =
c_tree_printer, from c_objc_common_init to c_initialize_diagnostics,
and right after c_common_diagnostics_set_defaults.  This
mimics what is done in cxx_initialize_diagnostics.

Moreover, in both c_initialize_diagnostics and
cxx_initialize_diagnostics, the FE-specific pretty-printer is
initialized first and then other settings are applied. This does not
make a difference right now, but if in the future one wishes to touch
something in the pretty-printer, it will not get overriden
immediately.

In fact, the code I removed in c_common_initialize_diagnostics, which
sets line_cutoff to 80, is useless because the pretty-printer created
here is actually never used, but overriden by the FE-specific
pretty-printers. This also means that doc/invoke.texi was wrong.

Finally, it is useless to set the maximum line length to 0 in the
constructor of cxx_pretty_printer.  It is the default anyway.

gcc/c/ChangeLog:

2014-10-26  Manuel López-Ibáñez  <manu@gcc.gnu.org>

    PR c++/53061
    * c-objc-common.c (c_objc_common_init): Do not do diagnostics
    initialization here...
    (c_initialize_diagnostics): ... but here. Set defaults after
    building pretty-printer.

gcc/ChangeLog:

2014-10-26  Manuel López-Ibáñez  <manu@gcc.gnu.org>

    PR c++/53061
    * doc/invoke.texi (fmessage-length): Update text to match reality.

gcc/cp/ChangeLog:

2014-10-26  Manuel López-Ibáñez  <manu@gcc.gnu.org>

    PR c++/53061
    * cp-objcp-common.c: Do not include new.
    (cxx_initialize_diagnostics): Move from here to ...
    * error.c (cxx_initialize_diagnostics): : ... here. Move
    diagnostics initialization here from init_error.
    (cxx_pp): Use a real pointer not a macro.
    (init_error): Just initialize cxx_pp.
    * cxx-pretty-print.c (cxx_pretty_printer::cxx_pretty_printer): Do
    not set maximum line length.

gcc/c-family/ChangeLog:

2014-10-26  Manuel López-Ibáñez  <manu@gcc.gnu.org>

    PR c++/53061
    * c-opts.c (c_common_diagnostics_set_defaults): Renamed from
    c_common_initialize_diagnostics.
    * c-common.h: Likewise.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/c-family/ChangeLog
    trunk/gcc/c-family/c-common.h
    trunk/gcc/c-family/c-opts.c
    trunk/gcc/c/ChangeLog
    trunk/gcc/c/c-objc-common.c
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/cp-objcp-common.c
    trunk/gcc/cp/cxx-pretty-print.c
    trunk/gcc/cp/error.c
    trunk/gcc/doc/invoke.texi
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Subject: [Bug c++/53061] [C/ObjC/C++/ObjC++] cleanup diagnostics initialization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53061

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |FIXED

--- Comment #3 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Fixed in GCC 5.0!
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Subject: [Bug target/55212] [SH] Switch to LRA
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idU212

--- Comment #78 from Kazumoto Kojima <kkojima at gcc dot gnu.org> ---
Created attachment 33813
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id3813&actioníit
a trial patch for the issue c#76

With it, the generated code for c#76 test case looks similar with
the one with non LRA compiler. The total code size regression for
CSiBE is reduced to 0.43%.
The patch introduces a new targetm function legitimize_address_display.
I've tested it on arm thumb with adding a similar new targetm function
to arm.c.  There is only one CSiBE test of which code size is changed
from 400 to 396 at -Os and there are no size changes at -O2 on thumb.
Although arm thumb is better than SH about those base+display addressing
because of 8-bit display for stack pointer register and no R0-ness,
it's a bit surprising to me.