Re: [PATCH] Add debug support for merging identical functions (aka ICF)

[Cary Coutant <ccoutant at google dot com>]

Ping...

-cary


On Sat, Aug 15, 2009 at 5:05 PM, Cary Coutant<ccoutant@google.com> wrote:
>> http://gcc.gnu.org/ml/gcc-patches/2009-07/msg01702.html
>
> Here's a refresh of this patch, with a small change I added to the
> direct call table to record a pointer to the caller's debug info,
> which I found is necessary to handle a recursive case where a pair of
> routines C and D get folded together, thus enabling a second pair of
> routines A and B to be folded, where A calls C and B calls D.
>
> -cary
>
>
> gcc/ChangeLog:
> ? ? ? ?Add support for debugging with ICF (Identical Code Folding).
> ? ? ? ?* calls.c (debug.h): New #include.
> ? ? ? ?(emit_call_1): Call virtual_call_token debug hook.
> ? ? ? ?* common.opt (-fenable-icf-debug): New option.
> ? ? ? ?* dwarf2out.c (dwarf2_debug_hooks): Add entries for new hooks (two
> ? ? ? ?locations in the source).
> ? ? ? ?(poc_label_num): New variable.
> ? ? ? ?(dcall_entry, vcall_entry): New typedefs.
> ? ? ? ?(dcall_table, vcall_table): New variables.
> ? ? ? ?(struct vcall_insn): New type.
> ? ? ? ?(vcall_insn_table): New variable.
> ? ? ? ?(DEBUG_DCALL_SECTION, DEBUG_VCALL_SECTION): New macros.
> ? ? ? ?(size_of_dcall_table): New function.
> ? ? ? ?(output_dcall_table): New function.
> ? ? ? ?(size_of_vcall_table): New function.
> ? ? ? ?(output_vcall_table): New function.
> ? ? ? ?(dwarf2out_direct_call): New function.
> ? ? ? ?(vcall_insn_table_hash): New function.
> ? ? ? ?(vcall_insn_table_eq): New function.
> ? ? ? ?(dwarf2out_virtual_call_token): New function.
> ? ? ? ?(dwarf2out_virtual_call): New function.
> ? ? ? ?(dwarf2out_init): Allocate new tables and sections.
> ? ? ? ?(prune_unused_types): Mark DIEs referenced from direct call table.
> ? ? ? ?(dwarf2out_finish): Output direct and virtual call tables.
> ? ? ? ?* final.c (final_scan_insn): Call direct_call and virtual_call
> ? ? ? ?debug hooks.
> ? ? ? ?* debug.h (struct gcc_debug_hooks): Add direct_call,
> ? ? ? ?virtual_call_token, virtual_call hooks.
> ? ? ? ?(debug_nothing_uid): New function.
> ? ? ? ?* debug.c (do_nothing_debug_hooks): Add dummy entries for new hooks.
> ? ? ? ?(debug_nothing_uid): New function.
> ? ? ? ?* dbxout.c (dbx_debug_hooks): Add dummy entries for new hooks.
> ? ? ? ?* sdbout.c (sdb_debug_hooks): Likewise.
> ? ? ? ?* vmsdbgout.c (vmsdbg_debug_hooks): Likewise.
> ? ? ? ?* doc/invoke.texi (-fenable-icf-debug): New option.
>
> gcc/testsuite/ChangeLog:
> ? ? ? ?Add support for debugging with ICF (Identical Code Folding).
> ? ? ? ?* g++.dg/debug/dwarf2/icf.C: New test.
>