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Improve objcopy's ability to merge build notes.

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* objcopy.c (merge_gnu_build_notes): Delete empty notes.  Merge
	identical function notes.
This commit is contained in:
Nick Clifton
2018-08-03 17:08:11 +01:00
parent 2688aab226
commit 4aae6e5abd
2 changed files with 40 additions and 3 deletions
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5
binutils/ChangeLog
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@ -1,3 +1,8 @@
2018-08-03 Nick Clifton <nickc@redhat.com>
* objcopy.c (merge_gnu_build_notes): Delete empty notes. Merge
identical function notes.
2018-08-01 Nick Clifton <nickc@redhat.com>
* README-how-to-make-a-release: Add note about regenerating the

38
binutils/objcopy.c
View File

@ -2177,7 +2177,7 @@ merge_gnu_build_notes (bfd * abfd, asection * sec, bfd_size_type size, bfd_byte
3. Eliminate any NT_GNU_BUILD_ATTRIBUTE_OPEN notes that have the same
full name field as the immediately preceeding note with the same type
of name and whose address ranges coincide.
IE - it there are gaps in the coverage of the notes, then these gaps
IE - if there are gaps in the coverage of the notes, then these gaps
must be preserved.
4. Combine the numeric value of any NT_GNU_BUILD_ATTRIBUTE_OPEN notes
of type GNU_BUILD_ATTRIBUTE_STACK_SIZE.
@ -2185,16 +2185,48 @@ merge_gnu_build_notes (bfd * abfd, asection * sec, bfd_size_type size, bfd_byte
its description field is empty then the nearest preceeding OPEN note
with a non-empty description field must also be preserved *OR* the
description field of the note must be changed to contain the starting
address to which it refers. */
address to which it refers.
6. Notes with the same start and end address can be deleted. */
for (pnote = pnotes + 1; pnote < pnotes_end; pnote ++)
{
int note_type;
objcopy_internal_note * back;
objcopy_internal_note * prev_open_with_range = NULL;
/* Rule 6 - delete 0-range notes. */
if (pnote->start == pnote->end)
{
duplicate_found = TRUE;
pnote->note.type = 0;
continue;
}
/* Rule 2 - preserve function notes. */
if (! is_open_note (pnote))
continue;
{
int iter;
/* Check to see if there is an identical previous function note.
This can happen with overlays for example. */
for (iter = 0, back = pnote -1; back >= pnotes; back --)
{
if (back->start == pnote->start
&& back->end == pnote->end
&& back->note.namesz == pnote->note.namesz
&& memcmp (back->note.namedata, pnote->note.namedata, pnote->note.namesz) == 0)
{
fprintf (stderr, "DUP FUNXC\n");
duplicate_found = TRUE;
pnote->note.type = 0;
break;
}
/* Don't scan too far back however. */
if (iter ++ > 16)
break;
}
continue;
}
note_type = pnote->note.namedata[attribute_type_byte];