From 22ccb8495447fa2ea31b1f1dea7e94eecf97475d Mon Sep 17 00:00:00 2001 From: Nick Alcock Date: Sat, 13 Jul 2019 21:47:30 +0100 Subject: [PATCH] bfd: new functions for getting strings out of a strtab The CTF linking process wants to deduplicate the CTF strtab against the ELF strtab, for which it needs to know the number of strings in the strtab and it needs to be able to extract them one by one. The BFD strtab functions only support returning the size-or-section-length of the strtab (with _bfd_elf_strtab_size) and returning the offset (but not string!) and decrementing the refcount at the same time. So add new functions _bfd_elf_strtab_len (that just returns the length in strings of the strtab, never the section size) and bfd_elf_strtab_str (which returns the string at a given strtab index, and its offset, without touching the refcount). It is probably a mistake to use _bfd_elf_strtab_str in particular before _bfd_elf_strtab_finalize is called, and will not produce useful output if you do so. v5: fix tabdamage. bfd/ * elf-strtab.c (_bfd_elf_strtab_len): New. (_bfd_elf_strtab_str): Likewise. * bfd-elf.h: Declare them. --- bfd/ChangeLog | 6 ++++++ bfd/elf-bfd.h | 4 ++++ bfd/elf-strtab.c | 19 +++++++++++++++++++ 3 files changed, 29 insertions(+) diff --git a/bfd/ChangeLog b/bfd/ChangeLog index 42300c111a6..420b13dd101 100644 --- a/bfd/ChangeLog +++ b/bfd/ChangeLog @@ -1,3 +1,9 @@ +2019-07-13 Nick Alcock + + * elf-strtab.c (_bfd_elf_strtab_len): New. + (_bfd_elf_strtab_str): Likewise. + * bfd-elf.h: Declare them. + 2019-07-13 Nick Alcock * elf-bfd.h (bfd_elf_get_str_section): Add. diff --git a/bfd/elf-bfd.h b/bfd/elf-bfd.h index a9e2d3eeaf1..4240d97a429 100644 --- a/bfd/elf-bfd.h +++ b/bfd/elf-bfd.h @@ -2252,8 +2252,12 @@ extern void _bfd_elf_strtab_restore (struct elf_strtab_hash *, void *); extern bfd_size_type _bfd_elf_strtab_size (struct elf_strtab_hash *); +extern bfd_size_type _bfd_elf_strtab_len + (struct elf_strtab_hash *); extern bfd_size_type _bfd_elf_strtab_offset (struct elf_strtab_hash *, size_t); +extern const char * _bfd_elf_strtab_str + (struct elf_strtab_hash *, size_t idx, size_t *offset); extern bfd_boolean _bfd_elf_strtab_emit (bfd *, struct elf_strtab_hash *); extern void _bfd_elf_strtab_finalize diff --git a/bfd/elf-strtab.c b/bfd/elf-strtab.c index ec9002fae7b..cc1dcb3f50a 100644 --- a/bfd/elf-strtab.c +++ b/bfd/elf-strtab.c @@ -270,6 +270,12 @@ _bfd_elf_strtab_size (struct elf_strtab_hash *tab) return tab->sec_size ? tab->sec_size : tab->size; } +bfd_size_type +_bfd_elf_strtab_len (struct elf_strtab_hash *tab) +{ + return tab->size; +} + bfd_size_type _bfd_elf_strtab_offset (struct elf_strtab_hash *tab, size_t idx) { @@ -285,6 +291,19 @@ _bfd_elf_strtab_offset (struct elf_strtab_hash *tab, size_t idx) return tab->array[idx]->u.index; } +const char * +_bfd_elf_strtab_str (struct elf_strtab_hash *tab, size_t idx, + bfd_size_type *offset) +{ + if (idx == 0) + return 0; + BFD_ASSERT (idx < tab->size); + BFD_ASSERT (tab->sec_size); + if (offset) + *offset = tab->array[idx]->u.index; + return tab->array[idx]->root.string; +} + bfd_boolean _bfd_elf_strtab_emit (register bfd *abfd, struct elf_strtab_hash *tab) { -- 2.30.2