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coff keep_relocs and keep_contents

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keep_relocs is set by pe_ILF_save_relocs but not used anywhere in the
coff/pe code.  It is tested by the xcoff backend but not set.

keep_contents is only used by the xcoff backend when dealing with
the .loader section, and it's easy enough to dispense with it there.
keep_contents is set in various places but that's fairly useless when
the contents aren't freed anyway until later linker support functions,
add_dynamic_symbols and check_dynamic_ar_symbols.  There the contents
were freed if keep_contents wasn't set.  I reckon we can free them
unconditionally.

	* coff-bfd.h (struct coff_section_tdata): Delete keep_relocs
	and keep_contents.
	* peicode.h (pe_ILF_save_relocs): Don't set keep_relocs.
	* xcofflink.c (xcoff_get_section_contents): Cache contents.
	Return the contents.  Update callers.
	(_bfd_xcoff_canonicalize_dynamic_symtab): Don't set
	keep_contents for .loader.
	(xcoff_link_add_dynamic_symbols): Free .loader contents
	unconditionally.
	(xcoff_link_check_dynamic_ar_symbols): Likewise.
This commit is contained in:
Alan Modra
2023-02-09 12:08:10 +10:30
parent 0d78a4c40e
commit c920e5cc60
3 changed files with 28 additions and 43 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
bfd/coff-bfd.h
View File

@ -43,12 +43,8 @@ struct coff_section_tdata
{
/* The relocs, swapped into COFF internal form. This may be NULL. */
struct internal_reloc *relocs;
/* If this is TRUE, the relocs entry may not be freed. */
bool keep_relocs;
/* The section contents. This may be NULL. */
bfd_byte *contents;
/* If this is TRUE, the contents entry may not be freed. */
bool keep_contents;
/* Information cached by coff_find_nearest_line. */
bool saved_bias;
bfd_signed_vma bias;

1
bfd/peicode.h
View File

@ -526,7 +526,6 @@ pe_ILF_save_relocs (pe_ILF_vars * vars,
abort ();
coff_section_data (vars->abfd, sec)->relocs = vars->int_reltab;
coff_section_data (vars->abfd, sec)->keep_relocs = true;
sec->relocation = vars->reltab;
sec->reloc_count = vars->relcount;

66
bfd/xcofflink.c
View File

@ -216,7 +216,7 @@ static bool xcoff_mark (struct bfd_link_info *, asection *);
/* Read the contents of a section. */
static bool
static bfd_byte *
xcoff_get_section_contents (bfd *abfd, asection *sec)
{
if (coff_section_data (abfd, sec) == NULL)
@ -225,22 +225,22 @@ xcoff_get_section_contents (bfd *abfd, asection *sec)
sec->used_by_bfd = bfd_zalloc (abfd, amt);
if (sec->used_by_bfd == NULL)
return false;
return NULL;
}
if (coff_section_data (abfd, sec)->contents == NULL)
bfd_byte *contents = coff_section_data (abfd, sec)->contents;
if (contents == NULL)
{
bfd_byte *contents;
if (! bfd_malloc_and_get_section (abfd, sec, &contents))
if (bfd_malloc_and_get_section (abfd, sec, &contents))
coff_section_data (abfd, sec)->contents = contents;
else
{
free (contents);
return false;
contents = NULL;
}
coff_section_data (abfd, sec)->contents = contents;
}
return true;
return contents;
}
/* Get the size required to hold the dynamic symbols. */
@ -265,9 +265,9 @@ _bfd_xcoff_get_dynamic_symtab_upper_bound (bfd *abfd)
return -1;
}
if (! xcoff_get_section_contents (abfd, lsec))
contents = xcoff_get_section_contents (abfd, lsec);
if (!contents)
return -1;
contents = coff_section_data (abfd, lsec)->contents;
bfd_xcoff_swap_ldhdr_in (abfd, (void *) contents, &ldhdr);
@ -299,11 +299,9 @@ _bfd_xcoff_canonicalize_dynamic_symtab (bfd *abfd, asymbol **psyms)
return -1;
}
if (! xcoff_get_section_contents (abfd, lsec))
contents = xcoff_get_section_contents (abfd, lsec);
if (!contents)
return -1;
contents = coff_section_data (abfd, lsec)->contents;
coff_section_data (abfd, lsec)->keep_contents = true;
bfd_xcoff_swap_ldhdr_in (abfd, contents, &ldhdr);
@ -386,9 +384,9 @@ _bfd_xcoff_get_dynamic_reloc_upper_bound (bfd *abfd)
return -1;
}
if (! xcoff_get_section_contents (abfd, lsec))
contents = xcoff_get_section_contents (abfd, lsec);
if (!contents)
return -1;
contents = coff_section_data (abfd, lsec)->contents;
bfd_xcoff_swap_ldhdr_in (abfd, (struct external_ldhdr *) contents, &ldhdr);
@ -421,9 +419,9 @@ _bfd_xcoff_canonicalize_dynamic_reloc (bfd *abfd,
return -1;
}
if (! xcoff_get_section_contents (abfd, lsec))
contents = xcoff_get_section_contents (abfd, lsec);
if (!contents)
return -1;
contents = coff_section_data (abfd, lsec)->contents;
bfd_xcoff_swap_ldhdr_in (abfd, contents, &ldhdr);
@ -915,9 +913,9 @@ xcoff_link_add_dynamic_symbols (bfd *abfd, struct bfd_link_info *info)
return false;
}
if (! xcoff_get_section_contents (abfd, lsec))
contents = xcoff_get_section_contents (abfd, lsec);
if (!contents)
return false;
contents = coff_section_data (abfd, lsec)->contents;
/* Remove the sections from this object, so that they do not get
included in the link. */
@ -1044,11 +1042,8 @@ xcoff_link_add_dynamic_symbols (bfd *abfd, struct bfd_link_info *info)
}
}
if (contents != NULL && ! coff_section_data (abfd, lsec)->keep_contents)
{
free (coff_section_data (abfd, lsec)->contents);
coff_section_data (abfd, lsec)->contents = NULL;
}
free (contents);
coff_section_data (abfd, lsec)->contents = NULL;
/* Record this file in the import files. */
n = bfd_alloc (abfd, (bfd_size_type) sizeof (struct xcoff_import_file));
@ -2306,8 +2301,7 @@ xcoff_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
/* If we are not keeping memory, free the reloc information. */
if (! info->keep_memory
&& coff_section_data (abfd, o) != NULL
&& ! coff_section_data (abfd, o)->keep_relocs)
&& coff_section_data (abfd, o) != NULL)
{
free (coff_section_data (abfd, o)->relocs);
coff_section_data (abfd, o)->relocs = NULL;
@ -2383,9 +2377,9 @@ xcoff_link_check_dynamic_ar_symbols (bfd *abfd,
/* There are no symbols, so don't try to include it. */
return true;
if (! xcoff_get_section_contents (abfd, lsec))
contents = xcoff_get_section_contents (abfd, lsec);
if (!contents)
return false;
contents = coff_section_data (abfd, lsec)->contents;
bfd_xcoff_swap_ldhdr_in (abfd, contents, &ldhdr);
@ -2434,12 +2428,9 @@ xcoff_link_check_dynamic_ar_symbols (bfd *abfd,
}
}
/* We do not need this shared object. */
if (contents != NULL && ! coff_section_data (abfd, lsec)->keep_contents)
{
free (coff_section_data (abfd, lsec)->contents);
coff_section_data (abfd, lsec)->contents = NULL;
}
/* We do not need this shared object's .loader section. */
free (contents);
coff_section_data (abfd, lsec)->contents = NULL;
return true;
}
@ -3142,8 +3133,7 @@ xcoff_mark (struct bfd_link_info *info, asection *sec)
}
if (! info->keep_memory
&& coff_section_data (sec->owner, sec) != NULL
&& ! coff_section_data (sec->owner, sec)->keep_relocs)
&& coff_section_data (sec->owner, sec) != NULL)
{
free (coff_section_data (sec->owner, sec)->relocs);
coff_section_data (sec->owner, sec)->relocs = NULL;