binutils-gdb/bfd/elf-strtab.c
Alan Modra 07d6d2b834 BFD whitespace fixes
Binutils is supposed to use tabs.  In my git config I have
whitespace = indent-with-non-tab,space-before-tab,trailing-space
and I got annoyed enough seeing red in "git diff" output to fix
the problems.

	* doc/header.sed: Trim trailing space when splitting lines.
	* aix386-core.c, * aout-adobe.c, * aout-arm.c, * aout-cris.c,
	* aout-ns32k.c, * aout-target.h, * aout-tic30.c, * aoutf1.h, * aoutx.h,
	* arc-got.h, * arc-plt.def, * arc-plt.h, * archive.c, * archive64.c,
	* archures.c, * armnetbsd.c, * bfd-in.h, * bfd.c, * bfdio.c, * binary.c,
	* bout.c, * cache.c, * cisco-core.c, * coff-alpha.c, * coff-apollo.c,
	* coff-arm.c, * coff-h8300.c, * coff-i386.c, * coff-i860.c,
	* coff-i960.c, * coff-m68k.c, * coff-m88k.c, * coff-mcore.c,
	* coff-mips.c, * coff-ppc.c, * coff-rs6000.c, * coff-sh.c,
	* coff-stgo32.c, * coff-tic4x.c, * coff-tic54x.c, * coff-tic80.c,
	* coff-we32k.c, * coff-x86_64.c, * coff-z80.c, * coff-z8k.c,
	* coff64-rs6000.c, * coffcode.h, * coffgen.c, * cofflink.c,
	* coffswap.h, * compress.c, * corefile.c, * cpu-alpha.c, * cpu-arm.c,
	* cpu-avr.c, * cpu-bfin.c, * cpu-cr16.c, * cpu-cr16c.c, * cpu-crx.c,
	* cpu-d10v.c, * cpu-frv.c, * cpu-ft32.c, * cpu-i370.c, * cpu-i960.c,
	* cpu-ia64-opc.c, * cpu-ip2k.c, * cpu-lm32.c, * cpu-m32r.c,
	* cpu-mcore.c, * cpu-microblaze.c, * cpu-mips.c, * cpu-moxie.c,
	* cpu-mt.c, * cpu-nios2.c, * cpu-ns32k.c, * cpu-or1k.c, * cpu-powerpc.c,
	* cpu-pru.c, * cpu-sh.c, * cpu-spu.c, * cpu-v850.c, * cpu-v850_rh850.c,
	* cpu-xgate.c, * cpu-z80.c, * dwarf1.c, * dwarf2.c, * ecoff.c,
	* ecofflink.c, * ecoffswap.h, * elf-bfd.h, * elf-eh-frame.c,
	* elf-hppa.h, * elf-m10200.c, * elf-m10300.c, * elf-s390-common.c,
	* elf-strtab.c, * elf-vxworks.c, * elf.c, * elf32-am33lin.c,
	* elf32-arc.c, * elf32-arm.c, * elf32-avr.c, * elf32-avr.h,
	* elf32-bfin.c, * elf32-cr16.c, * elf32-cr16c.c, * elf32-cris.c,
	* elf32-crx.c, * elf32-d10v.c, * elf32-d30v.c, * elf32-dlx.c,
	* elf32-epiphany.c, * elf32-fr30.c, * elf32-frv.c, * elf32-ft32.c,
	* elf32-h8300.c, * elf32-hppa.c, * elf32-i386.c, * elf32-i860.c,
	* elf32-i960.c, * elf32-ip2k.c, * elf32-lm32.c, * elf32-m32c.c,
	* elf32-m32r.c, * elf32-m68hc11.c, * elf32-m68hc12.c, * elf32-m68hc1x.c,
	* elf32-m68hc1x.h, * elf32-m68k.c, * elf32-m88k.c, * elf32-mcore.c,
	* elf32-mep.c, * elf32-metag.c, * elf32-microblaze.c, * elf32-mips.c,
	* elf32-moxie.c, * elf32-msp430.c, * elf32-mt.c, * elf32-nds32.c,
	* elf32-nds32.h, * elf32-nios2.c, * elf32-or1k.c, * elf32-pj.c,
	* elf32-ppc.c, * elf32-ppc.h, * elf32-pru.c, * elf32-rl78.c,
	* elf32-rx.c, * elf32-s390.c, * elf32-score.c, * elf32-score.h,
	* elf32-score7.c, * elf32-sh-symbian.c, * elf32-sh.c, * elf32-sh64.c,
	* elf32-sparc.c, * elf32-spu.c, * elf32-tic6x.c, * elf32-tilegx.c,
	* elf32-tilegx.h, * elf32-tilepro.c, * elf32-tilepro.h, * elf32-v850.c,
	* elf32-vax.c, * elf32-wasm32.c, * elf32-xc16x.c, * elf32-xgate.c,
	* elf32-xgate.h, * elf32-xstormy16.c, * elf32-xtensa.c, * elf64-alpha.c,
	* elf64-hppa.c, * elf64-ia64-vms.c, * elf64-mips.c, * elf64-mmix.c,
	* elf64-ppc.c, * elf64-s390.c, * elf64-sh64.c, * elf64-sparc.c,
	* elf64-tilegx.c, * elf64-tilegx.h, * elf64-x86-64.c, * elfcore.h,
	* elflink.c, * elfn32-mips.c, * elfnn-aarch64.c, * elfnn-ia64.c,
	* elfnn-riscv.c, * elfxx-aarch64.c, * elfxx-aarch64.h, * elfxx-ia64.c,
	* elfxx-ia64.h, * elfxx-mips.c, * elfxx-riscv.c, * elfxx-sparc.c,
	* elfxx-tilegx.c, * elfxx-x86.c, * elfxx-x86.h, * freebsd.h, * hash.c,
	* host-aout.c, * hp300hpux.c, * hppabsd-core.c, * hpux-core.c,
	* i386aout.c, * i386linux.c, * i386lynx.c, * i386mach3.c, * i386msdos.c,
	* i386netbsd.c, * ieee.c, * ihex.c, * irix-core.c, * libaout.h,
	* libbfd-in.h, * libbfd.c, * libcoff-in.h, * libnlm.h, * libpei.h,
	* libxcoff.h, * linker.c, * lynx-core.c, * m68k4knetbsd.c,
	* m68klinux.c, * m68knetbsd.c, * m88kmach3.c, * mach-o-aarch64.c,
	* mach-o-arm.c, * mach-o-i386.c, * mach-o-target.c, * mach-o-x86-64.c,
	* mach-o.c, * mach-o.h, * merge.c, * mipsbsd.c, * mmo.c, * netbsd.h,
	* netbsd-core.c, * newsos3.c, * nlm-target.h, * nlm32-ppc.c,
	* nlm32-sparc.c, * nlmcode.h, * ns32k.h, * ns32knetbsd.c, * oasys.c,
	* opncls.c, * pc532-mach.c, * pdp11.c, * pe-arm.c, * pe-i386.c,
	* pe-mcore.c, * pe-mips.c, * pe-x86_64.c, * peXXigen.c, * pef.c,
	* pef.h, * pei-arm.c, * pei-i386.c, * pei-mcore.c, * pei-x86_64.c,
	* peicode.h, * plugin.c, * ppcboot.c, * ptrace-core.c, * reloc.c,
	* riscix.c, * rs6000-core.c, * section.c, * som.c, * som.h,
	* sparclinux.c, * sparcnetbsd.c, * srec.c, * stabs.c, * sunos.c,
	* syms.c, * targets.c, * tekhex.c, * trad-core.c, * vax1knetbsd.c,
	* vaxnetbsd.c, * verilog.c, * versados.c, * vms-alpha.c, * vms-lib.c,
	* vms-misc.c, * wasm-module.c, * wasm-module.h, * xcofflink.c,
	* xsym.c, * xsym.h: Whitespace fixes.
	* bfd-in2.h, * libbfd.h, * libcoff.h: Regenerate.
2017-12-06 17:51:43 +10:30

447 lines
10 KiB
C

/* ELF strtab with GC and suffix merging support.
Copyright (C) 2001-2017 Free Software Foundation, Inc.
Written by Jakub Jelinek <jakub@redhat.com>.
This file is part of BFD, the Binary File Descriptor library.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#include "sysdep.h"
#include "bfd.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "hashtab.h"
#include "libiberty.h"
/* An entry in the strtab hash table. */
struct elf_strtab_hash_entry
{
struct bfd_hash_entry root;
/* Length of this entry. This includes the zero terminator. */
int len;
unsigned int refcount;
union {
/* Index within the merged section. */
bfd_size_type index;
/* Entry this is a suffix of (if len < 0). */
struct elf_strtab_hash_entry *suffix;
} u;
};
/* The strtab hash table. */
struct elf_strtab_hash
{
struct bfd_hash_table table;
/* Next available index. */
size_t size;
/* Number of array entries alloced. */
size_t alloced;
/* Final strtab size. */
bfd_size_type sec_size;
/* Array of pointers to strtab entries. */
struct elf_strtab_hash_entry **array;
};
/* Routine to create an entry in a section merge hashtab. */
static struct bfd_hash_entry *
elf_strtab_hash_newfunc (struct bfd_hash_entry *entry,
struct bfd_hash_table *table,
const char *string)
{
/* Allocate the structure if it has not already been allocated by a
subclass. */
if (entry == NULL)
entry = (struct bfd_hash_entry *)
bfd_hash_allocate (table, sizeof (struct elf_strtab_hash_entry));
if (entry == NULL)
return NULL;
/* Call the allocation method of the superclass. */
entry = bfd_hash_newfunc (entry, table, string);
if (entry)
{
/* Initialize the local fields. */
struct elf_strtab_hash_entry *ret;
ret = (struct elf_strtab_hash_entry *) entry;
ret->u.index = -1;
ret->refcount = 0;
ret->len = 0;
}
return entry;
}
/* Create a new hash table. */
struct elf_strtab_hash *
_bfd_elf_strtab_init (void)
{
struct elf_strtab_hash *table;
bfd_size_type amt = sizeof (struct elf_strtab_hash);
table = (struct elf_strtab_hash *) bfd_malloc (amt);
if (table == NULL)
return NULL;
if (!bfd_hash_table_init (&table->table, elf_strtab_hash_newfunc,
sizeof (struct elf_strtab_hash_entry)))
{
free (table);
return NULL;
}
table->sec_size = 0;
table->size = 1;
table->alloced = 64;
amt = sizeof (struct elf_strtab_hasn_entry *);
table->array = ((struct elf_strtab_hash_entry **)
bfd_malloc (table->alloced * amt));
if (table->array == NULL)
{
free (table);
return NULL;
}
table->array[0] = NULL;
return table;
}
/* Free a strtab. */
void
_bfd_elf_strtab_free (struct elf_strtab_hash *tab)
{
bfd_hash_table_free (&tab->table);
free (tab->array);
free (tab);
}
/* Get the index of an entity in a hash table, adding it if it is not
already present. */
size_t
_bfd_elf_strtab_add (struct elf_strtab_hash *tab,
const char *str,
bfd_boolean copy)
{
register struct elf_strtab_hash_entry *entry;
/* We handle this specially, since we don't want to do refcounting
on it. */
if (*str == '\0')
return 0;
BFD_ASSERT (tab->sec_size == 0);
entry = (struct elf_strtab_hash_entry *)
bfd_hash_lookup (&tab->table, str, TRUE, copy);
if (entry == NULL)
return (size_t) -1;
entry->refcount++;
if (entry->len == 0)
{
entry->len = strlen (str) + 1;
/* 2G strings lose. */
BFD_ASSERT (entry->len > 0);
if (tab->size == tab->alloced)
{
bfd_size_type amt = sizeof (struct elf_strtab_hash_entry *);
tab->alloced *= 2;
tab->array = (struct elf_strtab_hash_entry **)
bfd_realloc_or_free (tab->array, tab->alloced * amt);
if (tab->array == NULL)
return (size_t) -1;
}
entry->u.index = tab->size++;
tab->array[entry->u.index] = entry;
}
return entry->u.index;
}
void
_bfd_elf_strtab_addref (struct elf_strtab_hash *tab, size_t idx)
{
if (idx == 0 || idx == (size_t) -1)
return;
BFD_ASSERT (tab->sec_size == 0);
BFD_ASSERT (idx < tab->size);
++tab->array[idx]->refcount;
}
void
_bfd_elf_strtab_delref (struct elf_strtab_hash *tab, size_t idx)
{
if (idx == 0 || idx == (size_t) -1)
return;
BFD_ASSERT (tab->sec_size == 0);
BFD_ASSERT (idx < tab->size);
BFD_ASSERT (tab->array[idx]->refcount > 0);
--tab->array[idx]->refcount;
}
unsigned int
_bfd_elf_strtab_refcount (struct elf_strtab_hash *tab, size_t idx)
{
return tab->array[idx]->refcount;
}
void
_bfd_elf_strtab_clear_all_refs (struct elf_strtab_hash *tab)
{
size_t idx;
for (idx = 1; idx < tab->size; idx++)
tab->array[idx]->refcount = 0;
}
/* Save strtab refcounts prior to adding --as-needed library. */
struct strtab_save
{
size_t size;
unsigned int refcount[1];
};
void *
_bfd_elf_strtab_save (struct elf_strtab_hash *tab)
{
struct strtab_save *save;
size_t idx, size;
size = sizeof (*save) + (tab->size - 1) * sizeof (save->refcount[0]);
save = bfd_malloc (size);
if (save == NULL)
return save;
save->size = tab->size;
for (idx = 1; idx < tab->size; idx++)
save->refcount[idx] = tab->array[idx]->refcount;
return save;
}
/* Restore strtab refcounts on finding --as-needed library not needed. */
void
_bfd_elf_strtab_restore (struct elf_strtab_hash *tab, void *buf)
{
size_t idx, curr_size = tab->size;
struct strtab_save *save = (struct strtab_save *) buf;
BFD_ASSERT (tab->sec_size == 0);
BFD_ASSERT (save->size <= curr_size);
tab->size = save->size;
for (idx = 1; idx < save->size; ++idx)
tab->array[idx]->refcount = save->refcount[idx];
for (; idx < curr_size; ++idx)
{
/* We don't remove entries from the hash table, just set their
REFCOUNT to zero. Setting LEN zero will result in the size
growing if the entry is added again. See _bfd_elf_strtab_add. */
tab->array[idx]->refcount = 0;
tab->array[idx]->len = 0;
}
}
bfd_size_type
_bfd_elf_strtab_size (struct elf_strtab_hash *tab)
{
return tab->sec_size ? tab->sec_size : tab->size;
}
bfd_size_type
_bfd_elf_strtab_offset (struct elf_strtab_hash *tab, size_t idx)
{
struct elf_strtab_hash_entry *entry;
if (idx == 0)
return 0;
BFD_ASSERT (idx < tab->size);
BFD_ASSERT (tab->sec_size);
entry = tab->array[idx];
BFD_ASSERT (entry->refcount > 0);
entry->refcount--;
return tab->array[idx]->u.index;
}
bfd_boolean
_bfd_elf_strtab_emit (register bfd *abfd, struct elf_strtab_hash *tab)
{
bfd_size_type off = 1;
size_t i;
if (bfd_bwrite ("", 1, abfd) != 1)
return FALSE;
for (i = 1; i < tab->size; ++i)
{
register const char *str;
register unsigned int len;
BFD_ASSERT (tab->array[i]->refcount == 0);
len = tab->array[i]->len;
if ((int) len < 0)
continue;
str = tab->array[i]->root.string;
if (bfd_bwrite (str, len, abfd) != len)
return FALSE;
off += len;
}
BFD_ASSERT (off == tab->sec_size);
return TRUE;
}
/* Compare two elf_strtab_hash_entry structures. Called via qsort. */
static int
strrevcmp (const void *a, const void *b)
{
struct elf_strtab_hash_entry *A = *(struct elf_strtab_hash_entry **) a;
struct elf_strtab_hash_entry *B = *(struct elf_strtab_hash_entry **) b;
unsigned int lenA = A->len;
unsigned int lenB = B->len;
const unsigned char *s = (const unsigned char *) A->root.string + lenA - 1;
const unsigned char *t = (const unsigned char *) B->root.string + lenB - 1;
int l = lenA < lenB ? lenA : lenB;
while (l)
{
if (*s != *t)
return (int) *s - (int) *t;
s--;
t--;
l--;
}
return lenA - lenB;
}
static inline int
is_suffix (const struct elf_strtab_hash_entry *A,
const struct elf_strtab_hash_entry *B)
{
if (A->len <= B->len)
/* B cannot be a suffix of A unless A is equal to B, which is guaranteed
not to be equal by the hash table. */
return 0;
return memcmp (A->root.string + (A->len - B->len),
B->root.string, B->len - 1) == 0;
}
/* This function assigns final string table offsets for used strings,
merging strings matching suffixes of longer strings if possible. */
void
_bfd_elf_strtab_finalize (struct elf_strtab_hash *tab)
{
struct elf_strtab_hash_entry **array, **a, *e;
bfd_size_type amt, sec_size;
size_t size, i;
/* Sort the strings by suffix and length. */
amt = tab->size;
amt *= sizeof (struct elf_strtab_hash_entry *);
array = (struct elf_strtab_hash_entry **) bfd_malloc (amt);
if (array == NULL)
goto alloc_failure;
for (i = 1, a = array; i < tab->size; ++i)
{
e = tab->array[i];
if (e->refcount)
{
*a++ = e;
/* Adjust the length to not include the zero terminator. */
e->len -= 1;
}
else
e->len = 0;
}
size = a - array;
if (size != 0)
{
qsort (array, size, sizeof (struct elf_strtab_hash_entry *), strrevcmp);
/* Loop over the sorted array and merge suffixes. Start from the
end because we want eg.
s1 -> "d"
s2 -> "bcd"
s3 -> "abcd"
to end up as
s3 -> "abcd"
s2 _____^
s1 _______^
ie. we don't want s1 pointing into the old s2. */
e = *--a;
e->len += 1;
while (--a >= array)
{
struct elf_strtab_hash_entry *cmp = *a;
cmp->len += 1;
if (is_suffix (e, cmp))
{
cmp->u.suffix = e;
cmp->len = -cmp->len;
}
else
e = cmp;
}
}
alloc_failure:
if (array)
free (array);
/* Assign positions to the strings we want to keep. */
sec_size = 1;
for (i = 1; i < tab->size; ++i)
{
e = tab->array[i];
if (e->refcount && e->len > 0)
{
e->u.index = sec_size;
sec_size += e->len;
}
}
tab->sec_size = sec_size;
/* Adjust the rest. */
for (i = 1; i < tab->size; ++i)
{
e = tab->array[i];
if (e->refcount && e->len < 0)
e->u.index = e->u.suffix->u.index + (e->u.suffix->len + e->len);
}
}