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debugedit.c: imported from rpm.org

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Recent changes:
7e7ca4b 2010-08-17 Anssi Hannula	debugedit: fix incorrect error messages regarding -b and -d
e6a0b0e 2010-05-10 Roland McGrath	Make debugedit -i recompute build ID only when any DWARF was actually changed.
c4b6362 2010-05-10 Roland McGrath	Whitespace fixups for tools/debugedit.c
71a7dd8 2009-06-16 Panu Matilainen	Add debugedit support for DWARF-3 (RhBug:505774)
This commit is contained in:
Alexey Tourbin 2011-01-08 09:03:05 +03:00
parent 351e5f71be
commit ce4f05af30
3 changed files with 2313 additions and 0 deletions
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/* An expandable hash tables datatype.
Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
Contributed by Vladimir Makarov (vmakarov@cygnus.com).
This file is part of the libiberty library.
Libiberty is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
Libiberty 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with libiberty; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* This package implements basic hash table functionality. It is possible
to search for an entry, create an entry and destroy an entry.
Elements in the table are generic pointers.
The size of the table is not fixed; if the occupancy of the table
grows too high the hash table will be expanded.
The abstract data implementation is based on generalized Algorithm D
from Knuth's book "The art of computer programming". Hash table is
expanded by creation of new hash table and transferring elements from
the old table to the new table. */
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "tools/hashtab.h"
/* This macro defines reserved value for empty table entry. */
#define EMPTY_ENTRY ((void *) 0)
/* This macro defines reserved value for table entry which contained
a deleted element. */
#define DELETED_ENTRY ((void *) 1)
static unsigned long higher_prime_number (unsigned long);
static hashval_t hash_pointer (const void *);
static int eq_pointer (const void *, const void *);
static int htab_expand (htab_t);
static void **find_empty_slot_for_expand (htab_t, hashval_t);
/* At some point, we could make these be NULL, and modify the
hash-table routines to handle NULL specially; that would avoid
function-call overhead for the common case of hashing pointers. */
htab_hash htab_hash_pointer = hash_pointer;
htab_eq htab_eq_pointer = eq_pointer;
/* The following function returns a nearest prime number which is
greater than N, and near a power of two. */
static unsigned long
higher_prime_number (n)
unsigned long n;
{
/* These are primes that are near, but slightly smaller than, a
power of two. */
static unsigned long primes[] = {
(unsigned long) 2,
(unsigned long) 7,
(unsigned long) 13,
(unsigned long) 31,
(unsigned long) 61,
(unsigned long) 127,
(unsigned long) 251,
(unsigned long) 509,
(unsigned long) 1021,
(unsigned long) 2039,
(unsigned long) 4093,
(unsigned long) 8191,
(unsigned long) 16381,
(unsigned long) 32749,
(unsigned long) 65521,
(unsigned long) 131071,
(unsigned long) 262139,
(unsigned long) 524287,
(unsigned long) 1048573,
(unsigned long) 2097143,
(unsigned long) 4194301,
(unsigned long) 8388593,
(unsigned long) 16777213,
(unsigned long) 33554393,
(unsigned long) 67108859,
(unsigned long) 134217689,
(unsigned long) 268435399,
(unsigned long) 536870909,
(unsigned long) 1073741789,
(unsigned long) 2147483647,
/* 4294967291L */
((unsigned long) 2147483647) + ((unsigned long) 2147483644),
};
unsigned long* low = &primes[0];
unsigned long* high = &primes[sizeof(primes) / sizeof(primes[0])];
while (low != high)
{
unsigned long* mid = low + (high - low) / 2;
if (n > *mid)
low = mid + 1;
else
high = mid;
}
/* If we've run out of primes, abort. */
if (n > *low)
{
fprintf (stderr, "Cannot find prime bigger than %lu\n", n);
abort ();
}
return *low;
}
/* Returns a hash code for P. */
static hashval_t
hash_pointer (p)
const void * p;
{
return (hashval_t) ((long)p >> 3);
}
/* Returns non-zero if P1 and P2 are equal. */
static int
eq_pointer (p1, p2)
const void * p1;
const void * p2;
{
return p1 == p2;
}
/* This function creates table with length slightly longer than given
source length. The created hash table is initiated as empty (all the
hash table entries are EMPTY_ENTRY). The function returns the created
hash table. Memory allocation may fail; it may return NULL. */
htab_t
htab_try_create (size, hash_f, eq_f, del_f)
size_t size;
htab_hash hash_f;
htab_eq eq_f;
htab_del del_f;
{
htab_t result;
size = higher_prime_number (size);
result = (htab_t) calloc (1, sizeof (struct htab));
if (result == NULL)
return NULL;
result->entries = (void **) calloc (size, sizeof (void *));
if (result->entries == NULL)
{
free (result);
return NULL;
}
result->size = size;
result->hash_f = hash_f;
result->eq_f = eq_f;
result->del_f = del_f;
result->return_allocation_failure = 1;
return result;
}
/* This function frees all memory allocated for given hash table.
Naturally the hash table must already exist. */
void
htab_delete (htab)
htab_t htab;
{
int i;
if (htab->del_f)
for (i = htab->size - 1; i >= 0; i--)
if (htab->entries[i] != EMPTY_ENTRY
&& htab->entries[i] != DELETED_ENTRY)
(*htab->del_f) (htab->entries[i]);
free (htab->entries);
free (htab);
}
/* This function clears all entries in the given hash table. */
void
htab_empty (htab)
htab_t htab;
{
int i;
if (htab->del_f)
for (i = htab->size - 1; i >= 0; i--)
if (htab->entries[i] != EMPTY_ENTRY
&& htab->entries[i] != DELETED_ENTRY)
(*htab->del_f) (htab->entries[i]);
memset (htab->entries, 0, htab->size * sizeof (void *));
}
/* Similar to htab_find_slot, but without several unwanted side effects:
- Does not call htab->eq_f when it finds an existing entry.
- Does not change the count of elements/searches/collisions in the
hash table.
This function also assumes there are no deleted entries in the table.
HASH is the hash value for the element to be inserted. */
static void **
find_empty_slot_for_expand (htab, hash)
htab_t htab;
hashval_t hash;
{
size_t size = htab->size;
hashval_t hash2 = 1 + hash % (size - 2);
unsigned int index = hash % size;
for (;;)
{
void **slot = htab->entries + index;
if (*slot == EMPTY_ENTRY)
return slot;
else if (*slot == DELETED_ENTRY)
abort ();
index += hash2;
if (index >= size)
index -= size;
}
}
/* The following function changes size of memory allocated for the
entries and repeatedly inserts the table elements. The occupancy
of the table after the call will be about 50%. Naturally the hash
table must already exist. Remember also that the place of the
table entries is changed. If memory allocation failures are allowed,
this function will return zero, indicating that the table could not be
expanded. If all goes well, it will return a non-zero value. */
static int
htab_expand (htab)
htab_t htab;
{
void **oentries;
void **olimit;
void **p;
oentries = htab->entries;
olimit = oentries + htab->size;
htab->size = higher_prime_number (htab->size * 2);
if (htab->return_allocation_failure)
{
void **nentries = (void **) calloc (htab->size, sizeof (void **));
if (nentries == NULL)
return 0;
htab->entries = nentries;
}
htab->n_elements -= htab->n_deleted;
htab->n_deleted = 0;
p = oentries;
do
{
void * x = *p;
if (x != EMPTY_ENTRY && x != DELETED_ENTRY)
{
void **q = find_empty_slot_for_expand (htab, (*htab->hash_f) (x));
*q = x;
}
p++;
}
while (p < olimit);
free (oentries);
return 1;
}
/* This function searches for a hash table entry equal to the given
element. It cannot be used to insert or delete an element. */
void *
htab_find_with_hash (htab, element, hash)
htab_t htab;
const void * element;
hashval_t hash;
{
unsigned int index;
hashval_t hash2;
size_t size;
void * entry;
htab->searches++;
size = htab->size;
index = hash % size;
entry = htab->entries[index];
if (entry == EMPTY_ENTRY
|| (entry != DELETED_ENTRY && (*htab->eq_f) (entry, element)))
return entry;
hash2 = 1 + hash % (size - 2);
for (;;)
{
htab->collisions++;
index += hash2;
if (index >= size)
index -= size;
entry = htab->entries[index];
if (entry == EMPTY_ENTRY
|| (entry != DELETED_ENTRY && (*htab->eq_f) (entry, element)))
return entry;
}
}
/* Like htab_find_slot_with_hash, but compute the hash value from the
element. */
void *
htab_find (htab, element)
htab_t htab;
const void * element;
{
return htab_find_with_hash (htab, element, (*htab->hash_f) (element));
}
/* This function searches for a hash table slot containing an entry
equal to the given element. To delete an entry, call this with
INSERT = 0, then call htab_clear_slot on the slot returned (possibly
after doing some checks). To insert an entry, call this with
INSERT = 1, then write the value you want into the returned slot.
When inserting an entry, NULL may be returned if memory allocation
fails. */
void **
htab_find_slot_with_hash (htab, element, hash, insert)
htab_t htab;
const void * element;
hashval_t hash;
enum insert_option insert;
{
void **first_deleted_slot;
unsigned int index;
hashval_t hash2;
size_t size;
if (insert == INSERT && htab->size * 3 <= htab->n_elements * 4
&& htab_expand (htab) == 0)
return NULL;
size = htab->size;
hash2 = 1 + hash % (size - 2);
index = hash % size;
htab->searches++;
first_deleted_slot = NULL;
for (;;)
{
void * entry = htab->entries[index];
if (entry == EMPTY_ENTRY)
{
if (insert == NO_INSERT)
return NULL;
htab->n_elements++;
if (first_deleted_slot)
{
*first_deleted_slot = EMPTY_ENTRY;
return first_deleted_slot;
}
return &htab->entries[index];
}
if (entry == DELETED_ENTRY)
{
if (!first_deleted_slot)
first_deleted_slot = &htab->entries[index];
}
else if ((*htab->eq_f) (entry, element))
return &htab->entries[index];
htab->collisions++;
index += hash2;
if (index >= size)
index -= size;
}
}
/* Like htab_find_slot_with_hash, but compute the hash value from the
element. */
void **
htab_find_slot (htab, element, insert)
htab_t htab;
const void * element;
enum insert_option insert;
{
return htab_find_slot_with_hash (htab, element, (*htab->hash_f) (element),
insert);
}
/* This function deletes an element with the given value from hash
table. If there is no matching element in the hash table, this
function does nothing. */
void
htab_remove_elt (htab, element)
htab_t htab;
void * element;
{
void **slot;
slot = htab_find_slot (htab, element, NO_INSERT);
if (*slot == EMPTY_ENTRY)
return;
if (htab->del_f)
(*htab->del_f) (*slot);
*slot = DELETED_ENTRY;
htab->n_deleted++;
}
/* This function clears a specified slot in a hash table. It is
useful when you've already done the lookup and don't want to do it
again. */
void
htab_clear_slot (htab, slot)
htab_t htab;
void **slot;
{
if (slot < htab->entries || slot >= htab->entries + htab->size
|| *slot == EMPTY_ENTRY || *slot == DELETED_ENTRY)
abort ();
if (htab->del_f)
(*htab->del_f) (*slot);
*slot = DELETED_ENTRY;
htab->n_deleted++;
}
/* This function scans over the entire hash table calling
CALLBACK for each live entry. If CALLBACK returns false,
the iteration stops. INFO is passed as CALLBACK's second
argument. */
void
htab_traverse (htab, callback, info)
htab_t htab;
htab_trav callback;
void * info;
{
void **slot = htab->entries;
void **limit = slot + htab->size;
do
{
void * x = *slot;
if (x != EMPTY_ENTRY && x != DELETED_ENTRY)
if (!(*callback) (slot, info))
break;
}
while (++slot < limit);
}
/* Return the current size of given hash table. */
size_t
htab_size (htab)
htab_t htab;
{
return htab->size;
}
/* Return the current number of elements in given hash table. */
size_t
htab_elements (htab)
htab_t htab;
{
return htab->n_elements - htab->n_deleted;
}
/* Return the fraction of fixed collisions during all work with given
hash table. */
double
htab_collisions (htab)
htab_t htab;
{
if (htab->searches == 0)
return 0.0;
return (double) htab->collisions / (double) htab->searches;
}

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/* An expandable hash tables datatype.
Copyright (C) 1999, 2000 Free Software Foundation, Inc.
Contributed by Vladimir Makarov (vmakarov@cygnus.com).
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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* This package implements basic hash table functionality. It is possible
to search for an entry, create an entry and destroy an entry.
Elements in the table are generic pointers.
The size of the table is not fixed; if the occupancy of the table
grows too high the hash table will be expanded.
The abstract data implementation is based on generalized Algorithm D
from Knuth's book "The art of computer programming". Hash table is
expanded by creation of new hash table and transferring elements from
the old table to the new table. */
#ifndef __HASHTAB_H__
#define __HASHTAB_H__
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/* The type for a hash code. */
typedef unsigned int hashval_t;
/* Callback function pointer types. */
/* Calculate hash of a table entry. */
typedef hashval_t (*htab_hash) (const void *);
/* Compare a table entry with a possible entry. The entry already in
the table always comes first, so the second element can be of a
different type (but in this case htab_find and htab_find_slot
cannot be used; instead the variants that accept a hash value
must be used). */
typedef int (*htab_eq) (const void *, const void *);
/* Cleanup function called whenever a live element is removed from
the hash table. */
typedef void (*htab_del) (void *);
/* Function called by htab_traverse for each live element. The first
arg is the slot of the element (which can be passed to htab_clear_slot
if desired), the second arg is the auxiliary pointer handed to
htab_traverse. Return 1 to continue scan, 0 to stop. */
typedef int (*htab_trav) (void **, void *);
/* Hash tables are of the following type. The structure
(implementation) of this type is not needed for using the hash
tables. All work with hash table should be executed only through
functions mentioned below. */
struct htab
{
/* Pointer to hash function. */
htab_hash hash_f;
/* Pointer to comparison function. */
htab_eq eq_f;
/* Pointer to cleanup function. */
htab_del del_f;
/* Table itself. */
void **entries;
/* Current size (in entries) of the hash table */
size_t size;
/* Current number of elements including also deleted elements */
size_t n_elements;
/* Current number of deleted elements in the table */
size_t n_deleted;
/* The following member is used for debugging. Its value is number
of all calls of `htab_find_slot' for the hash table. */
unsigned int searches;
/* The following member is used for debugging. Its value is number
of collisions fixed for time of work with the hash table. */
unsigned int collisions;
/* This is non-zero if we are allowed to return NULL for function calls
that allocate memory. */
int return_allocation_failure;
};
typedef struct htab *htab_t;
/* An enum saying whether we insert into the hash table or not. */
enum insert_option {NO_INSERT, INSERT};
/* The prototypes of the package functions. */
/* This function is like htab_create, but may return NULL if memory
allocation fails, and also signals that htab_find_slot_with_hash and
htab_find_slot are allowed to return NULL when inserting. */
extern htab_t htab_try_create (size_t, htab_hash, htab_eq, htab_del);
extern void htab_delete (htab_t);
extern void htab_empty (htab_t);
extern void *htab_find (htab_t, const void *);
extern void **htab_find_slot (htab_t, const void *, enum insert_option);
extern void *htab_find_with_hash (htab_t, const void *, hashval_t);
extern void **htab_find_slot_with_hash (htab_t, const void *, hashval_t,
enum insert_option);
extern void htab_clear_slot (htab_t, void **);
extern void htab_remove_elt (htab_t, void *);
extern void htab_traverse (htab_t, htab_trav, void *);
extern size_t htab_size (htab_t);
extern size_t htab_elements (htab_t);
extern double htab_collisions (htab_t);
/* A hash function for pointers. */
extern htab_hash htab_hash_pointer;
/* An equality function for pointers. */
extern htab_eq htab_eq_pointer;
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* __HASHTAB_H */