Michal Jires <mji...@suse.cz> writes:
> Check that must_remain_in_tu is partitioned correctly, and that
> refereced_from_asm is not renamed.
>
> gcc/lto/ChangeLog:
>
> * lto-partition.cc (lto_1_to_1_map): must_remain_in_tu check.
> (privatize_symbol_name_1): refereced_from_asm check.
I get this when trying out the patches:
# LDFINAL vmlinux.o
sh
/var/tmp/portage/sys-kernel/gentoo-kernel-6.16.4/work/linux-6.16/scripts/gcc-ld
-flinker-output=nolto-rel -flto=jobserver -flto-partition=1to1 -fwhole-program
-m elf_x86_64 --compre
ss-debug-sections=zlib -z noexecstack --no-warn-rwx-segments -r -o vmlinux.o
--whole-archive vmlinux.a --no-whole-archive --start-group --end-group ;
./tools/objtool/objtool --hacks=
jump_label --hacks=noinstr --ibt --orc --retpoline --rethunk --sls
--static-call --uaccess --link vmlinux.o
x86_64-pc-linux-gnu-gcc -nostdlib -flinker-output=nolto-rel -flto=jobserver
-flto-partition=1to1 -fwhole-program -Wl,-m,elf_x86_64
-Wl,--compress-debug-sections=zlib -Wl,-z,noexecstack -
Wl,--no-warn-rwx-segments -r -o vmlinux.o -Wl,--whole-archive vmlinux.a
-Wl,--no-whole-archive -Wl,--start-group -Wl,--end-group
lto1: fatal error: Tried to privatize symbol sp_mod_init.
compilation terminated.
lto-wrapper: fatal error: x86_64-pc-linux-gnu-gcc returned 1 exit status
compilation terminated.
I haven't tried to figure out why though.
> ---
> gcc/lto/lto-partition.cc | 43 ++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 43 insertions(+)
>
> diff --git a/gcc/lto/lto-partition.cc b/gcc/lto/lto-partition.cc
> index b87ca440bc9..484a9ea9d94 100644
> --- a/gcc/lto/lto-partition.cc
> +++ b/gcc/lto/lto-partition.cc
> @@ -393,6 +393,42 @@ lto_1_to_1_map (void)
> /* Order partitions by order of symbols because they are linked into binary
> that way. */
> ltrans_partitions.qsort (cmp_partitions_order);
> +
> + /* Check that symbols with must_remain_in_tu are partitioned correctly. */
> + if (flag_checking)
> + {
> + unsigned partitions = ltrans_partitions.length ();
> + for (unsigned i = 0; i < partitions ; i++)
> + {
> + ltrans_partition p = ltrans_partitions[i];
> + lto_symtab_encoder_iterator lsei;
> + for (lsei = lsei_start_in_partition (p->encoder);
> + !lsei_end_p (lsei);
> + lsei_next_in_partition (&lsei))
> + {
> + symtab_node *node = dyn_cast<symtab_node*> (lsei_node (lsei));
> + if (!node)
> + continue;
> + if (!node->must_remain_in_tu)
> + continue;
> + if (!lto_symtab_encoder_in_partition_p (p->encoder, node))
> + continue;
> + if (node->asm_name ()[0] == '*')
> + continue;
> + if (!node->lto_file_data)
> + continue;
> +
> + ltrans_partition *slot = pmap.get (node->lto_file_data);
> + if (!slot || *(slot) != p)
> + {
> + const char* fname = node->lto_file_data->file_name;
> + fatal_error (input_location, "Symbol %s from file %s"
> + "cannot be in partition %s",
> + node->asm_name (), fname, p->name);
> + }
> + }
> + }
> + }
> }
>
> /* Creates partition with all toplevel assembly.
> @@ -1691,6 +1727,13 @@ privatize_symbol_name_1 (symtab_node *node, tree decl)
> if (must_not_rename (node, name0))
> return false;
>
> + if (node->referenced_from_asm)
> + {
> + /* Symbols referenced from asm should not change their name. */
> + fatal_error (input_location, "Tried to privatize symbol %s.",
> + node->asm_name ());
> + }
> +
> const char *name = maybe_rewrite_identifier (name0);
> unsigned &clone_number = lto_clone_numbers->get_or_insert (name);
> symtab->change_decl_assembler_name (decl,
