[google][4.7]Port function reordering via linker plugin from google/gcc-4_6 branch (issue6195099)

[Sriraman Tallam]

Patch committed. I am preparing to send to trunk by splitting this
into multiple patches.

Thanks,
-Sri.

On Wed, May 16, 2012 at 9:23 PM, Xinliang David Li <davidxl@google.com> wrote:
> ok for google-4_7 branch. This should also be pushed to trunk.
>
> Thanks,
>
> David
>
> On Wed, May 16, 2012 at 6:56 PM, Sriraman Tallam <tmsriram@google.com> wrote:
>> Patch too large to be attached, rejected by gcc-patches. Please see:
>>
>> http://codereview.appspot.com/download/issue6195099_1.diff
>>
>> Thanks,
>> -Sri.
>>
>> On Wed, May 16, 2012 at 6:52 PM, Sriraman Tallam <tmsriram@google.com> wrote:
>>> Hi,
>>>
>>>  This patch ports function reordering support into google/gcc-4_7 branch
>>>  from google/gcc-4_6 branch.  There are 3 parts which are combined:
>>>
>>>  * Adding option -freoder-functions=callgraph.
>>>  * Dumping callgraph profiles in separate sections.
>>>  * The linker plugin itself.
>>>
>>>  Port revisions from google/gcc-4_6
>>>  r177289, r177308, r179104, r179289, r179303, r179404, r182447
>>>
>>>  into google/gcc-4_7
>>>
>>>  adding function reordering support via linker plugin invoked with option
>>>  -freorder-functions=callgraph.
>>>
>>> Patch also can be reviewed here: http://codereview.appspot.com/6195099
>>>
>>> function_reordering_plugin:
>>>
>>>       * config.h.in: Generate.
>>>       * configure: Generate.
>>>       * Makefile.in: New file.
>>>       * configure.ac: New file.
>>>       * callgraph.h: New file.
>>>       * callgraph.c: New file.
>>>       * function_reordering_plugin.c: New file.
>>>       * Makefile.am: Generate.
>>>       * aclocal.m4: Generate.
>>>
>>> gcc:
>>>       * doc/invoke.texi: Document -freorder-functions=*
>>>       * cgraphbuild.c (remove_cgraph_callee_edges): Preserve
>>>       callgraph till pass_final.
>>>       * configure: Regenerate.
>>>       * final.c (dump_cgraph_profiles): New function.
>>>       (rest_of_handle_final): Call dumping of cgraph profiles in
>>>       .gnu.text.callgraph sections.
>>>       * gcc.c (LINK_COMMAND_SPEC): Process -freorder-functions=
>>>       (set_func_reorder_linker_plugin_spec): New function.
>>>       (main): Call function reorder plugin.
>>>       * testsuite/lib/target-supports-dg.exp
>>>       (dg-require-section-exclude): New proc.
>>>       (dg-require-linker-function-reordering-plugin): New proc.
>>>       * testsuite/lib/target-supports.exp
>>>       (check_section_exclude_available): New proc.
>>>       (check_linker_function_reordering_plugin_supported): New proc.
>>>       * testsuite/g++.dg/tree-prof/callgraph-profiles.C: New test.
>>>       * config.in: undef FRPLUGINSONAME
>>>       * opts.c
>>>       * configure.ac (FRPLUGINSONAME): Define
>>>       * common.opt (fcallgraph-profiles-sections): Remove.
>>>       (freorder-functions=): New option.
>>>       * tree-optimize.c (gate_all_optimizations): Mark last cleanup of
>>>       callgraph.
>>>       * config.host: Set function reordering plugin.
>>>       * params.def (PARAM_NOTE_CGRAPH_SECTION_EDGE_THRESHOLD): Remove.
>>>       (PARAM_GNU_CGRAPH_SECTION_EDGE_THRESHOLD): Add.
>>>
>>> toplevel:
>>>       * Makefile.in: Regenerate.
>>>       * Makefile.def: Build function reordering plugin.
>>>       * configure.ac: Build function reordering plugin.
>>>       * configure: Regenerate.
>>>
>>> Patch attached.
>>>
>>> Thanks,
>>> -Sri.