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/* hash.c -- hash table routines for BFD

   Copyright (C) 1993-2015 Free Software Foundation, Inc.

   Written by Steve Chamberlain 

   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 "objalloc.h"

#include "libiberty.h"

/*

SECTION

	Hash Tables

@cindex Hash tables

	BFD provides a simple set of hash table functions.  Routines

	are provided to initialize a hash table, to free a hash table,

	to look up a string in a hash table and optionally create an

	entry for it, and to traverse a hash table.  There is

	currently no routine to delete an string from a hash table.

	The basic hash table does not permit any data to be stored

	with a string.  However, a hash table is designed to present a

	base class from which other types of hash tables may be

	derived.  These derived types may store additional information

	with the string.  Hash tables were implemented in this way,

	rather than simply providing a data pointer in a hash table

	entry, because they were designed for use by the linker back

	ends.  The linker may create thousands of hash table entries,

	and the overhead of allocating private data and storing and

	following pointers becomes noticeable.

	The basic hash table code is in <>.

@menu

@* Creating and Freeing a Hash Table::

@* Looking Up or Entering a String::

@* Traversing a Hash Table::

@* Deriving a New Hash Table Type::

@end menu

INODE

Creating and Freeing a Hash Table, Looking Up or Entering a String, Hash Tables, Hash Tables

SUBSECTION

	Creating and freeing a hash table

@findex bfd_hash_table_init

@findex bfd_hash_table_init_n

	To create a hash table, create an instance of a <

	bfd_hash_table>> (defined in <>) and call

	<> (if you know approximately how many

	entries you will need, the function <>,

	which takes a @var{size} argument, may be used).

	<> returns <> if some sort of

	error occurs.

@findex bfd_hash_newfunc

	The function <> take as an argument a

	function to use to create new entries.  For a basic hash

	table, use the function <>.  @xref{Deriving

	a New Hash Table Type}, for why you would want to use a

	different value for this argument.

@findex bfd_hash_allocate

	<> will create an objalloc which will be

	used to allocate new entries.  You may allocate memory on this

	objalloc using <>.

@findex bfd_hash_table_free

	Use <> to free up all the memory that has

	been allocated for a hash table.  This will not free up the

	<> itself, which you must provide.

@findex bfd_hash_set_default_size

	Use <> to set the default size of

	hash table to use.

INODE

Looking Up or Entering a String, Traversing a Hash Table, Creating and Freeing a Hash Table, Hash Tables

SUBSECTION

	Looking up or entering a string

@findex bfd_hash_lookup

	The function <> is used both to look up a

	string in the hash table and to create a new entry.

	If the @var{create} argument is <>, <>

	will look up a string.  If the string is found, it will

	returns a pointer to a <>.  If the

	string is not found in the table <> will

	return <>.  You should not modify any of the fields in

	the returns <>.

	If the @var{create} argument is <>, the string will be

	entered into the hash table if it is not already there.

	Either way a pointer to a <> will be

	returned, either to the existing structure or to a newly

	created one.  In this case, a <> return means that an

	error occurred.

	If the @var{create} argument is <>, and a new entry is

	created, the @var{copy} argument is used to decide whether to

	copy the string onto the hash table objalloc or not.  If

	@var{copy} is passed as <>, you must be careful not to

	deallocate or modify the string as long as the hash table

	exists.

INODE

Traversing a Hash Table, Deriving a New Hash Table Type, Looking Up or Entering a String, Hash Tables

SUBSECTION

	Traversing a hash table

@findex bfd_hash_traverse

	The function <> may be used to traverse a

	hash table, calling a function on each element.  The traversal

	is done in a random order.

	<> takes as arguments a function and a

	generic <> pointer.  The function is called with a

	hash table entry (a <>) and the

	generic pointer passed to <>.  The function

	must return a <> value, which indicates whether to

	continue traversing the hash table.  If the function returns

	<>, <> will stop the traversal and

	return immediately.

INODE

Deriving a New Hash Table Type, , Traversing a Hash Table, Hash Tables

SUBSECTION

	Deriving a new hash table type

	Many uses of hash tables want to store additional information

	which each entry in the hash table.  Some also find it

	convenient to store additional information with the hash table

	itself.  This may be done using a derived hash table.

	Since C is not an object oriented language, creating a derived

	hash table requires sticking together some boilerplate

	routines with a few differences specific to the type of hash

	table you want to create.

	An example of a derived hash table is the linker hash table.

	The structures for this are defined in <>.  The

	functions are in <>.

	You may also derive a hash table from an already derived hash

	table.  For example, the a.out linker backend code uses a hash

	table derived from the linker hash table.

@menu

@* Define the Derived Structures::

@* Write the Derived Creation Routine::

@* Write Other Derived Routines::

@end menu

INODE

Define the Derived Structures, Write the Derived Creation Routine, Deriving a New Hash Table Type, Deriving a New Hash Table Type

SUBSUBSECTION

	Define the derived structures

	You must define a structure for an entry in the hash table,

	and a structure for the hash table itself.

	The first field in the structure for an entry in the hash

	table must be of the type used for an entry in the hash table

	you are deriving from.  If you are deriving from a basic hash

	table this is <>, which is defined in

	<>.  The first field in the structure for the hash

	table itself must be of the type of the hash table you are

	deriving from itself.  If you are deriving from a basic hash

	table, this is <>.

	For example, the linker hash table defines <

	bfd_link_hash_entry>> (in <>).  The first field,

	<>, is of type <>.  Similarly,

	the first field in <>, <>,

        
        

           

           

           

           
	is of type <>.
        
        

           

           

           

           
 
        
        

           

           

           

           
INODE
        
        

           

           

           

           
Write the Derived Creation Routine, Write Other Derived Routines, Define the Derived Structures, Deriving a New Hash Table Type
        
        

           

           

           

           
SUBSUBSECTION
        
        

           

           

           

           
	Write the derived creation routine
        
        

           

           

           

           
 
        
        

           

           

           

           
	You must write a routine which will create and initialize an
        
        

           

           

           

           
	entry in the hash table.  This routine is passed as the
        
        

           

           

           

           
	function argument to <>.
        
        

           

           

           

           
 
        
        

           

           

           

           
	In order to permit other hash tables to be derived from the
        
        

           

           

           

           
	hash table you are creating, this routine must be written in a
        
        

           

           

           

           
	standard way.
        
        

           

           

           

           
 
        
        

           

           

           

           
	The first argument to the creation routine is a pointer to a
        
        

           

           

           

           
	hash table entry.  This may be <>, in which case the
        
        

           

           

           

           
	routine should allocate the right amount of space.  Otherwise
        
        

           

           

           

           
	the space has already been allocated by a hash table type
        
        

           

           

           

           
	derived from this one.
        
        

           

           

           

           
 
        
        

           

           

           

           
	After allocating space, the creation routine must call the
        
        

           

           

           

           
	creation routine of the hash table type it is derived from,
        
        

           

           

           

           
	passing in a pointer to the space it just allocated.  This
        
        

           

           

           

           
	will initialize any fields used by the base hash table.
        
        

           

           

           

           
 
        
        

           

           

           

           
	Finally the creation routine must initialize any local fields
        
        

           

           

           

           
	for the new hash table type.
        
        

           

           

           

           
 
        
        

           

           

           

           
	Here is a boilerplate example of a creation routine.
        
        

           

           

           

           
	@var{function_name} is the name of the routine.
        
        

           

           

           

           
	@var{entry_type} is the type of an entry in the hash table you
        
        

           

           

           

           
	are creating.  @var{base_newfunc} is the name of the creation
        
        

           

           

           

           
	routine of the hash table type your hash table is derived
        
        

           

           

           

           
	from.
        
        

           

           

           

           
 
        
        

           

           

           

           
EXAMPLE
        
        

           

           

           

           
 
        
        

           

           

           

           
.struct bfd_hash_entry *
        
        

           

           

           

           
.@var{function_name} (struct bfd_hash_entry *entry,
        
        

           

           

           

           
.                     struct bfd_hash_table *table,
        
        

           

           

           

           
.                     const char *string)
        
        

           

           

           

           
.{
        
        

           

           

           

           
.  struct @var{entry_type} *ret = (@var{entry_type} *) entry;
        
        

           

           

           

           
.
        
        

           

           

           

           
. {* Allocate the structure if it has not already been allocated by a
        
        

           

           

           

           
.    derived class.  *}
        
        

           

           

           

           
.  if (ret == NULL)
        
        

           

           

           

           
.    {
        
        

           

           

           

           
.      ret = bfd_hash_allocate (table, sizeof (* ret));
        
        

           

           

           

           
.      if (ret == NULL)
        
        

           

           

           

           
.        return NULL;
        
        

           

           

           

           
.    }
        
        

           

           

           

           
.
        
        

           

           

           

           
. {* Call the allocation method of the base class.  *}
        
        

           

           

           

           
.  ret = ((@var{entry_type} *)
        
        

           

           

           

           
.	 @var{base_newfunc} ((struct bfd_hash_entry *) ret, table, string));
        
        

           

           

           

           
.
        
        

           

           

           

           
. {* Initialize the local fields here.  *}
        
        

           

           

           

           
.
        
        

           

           

           

           
.  return (struct bfd_hash_entry *) ret;
        
        

           

           

           

           
.}
        
        

           

           

           

           
 
        
        

           

           

           

           
DESCRIPTION
        
        

           

           

           

           
	The creation routine for the linker hash table, which is in
        
        

           

           

           

           
	<>, looks just like this example.
        
        

           

           

           

           
	@var{function_name} is <<_bfd_link_hash_newfunc>>.
        
        

           

           

           

           
	@var{entry_type} is <>.
        
        

           

           

           

           
	@var{base_newfunc} is <>, the creation
        
        

           

           

           

           
	routine for a basic hash table.
        
        

           

           

           

           
 
        
        

           

           

           

           
	<<_bfd_link_hash_newfunc>> also initializes the local fields
        
        

           

           

           

           
	in a linker hash table entry: <>, <> and
        
        

           

           

           

           
	<>.
        
        

           

           

           

           
 
        
        

           

           

           

           
INODE
        
        

           

           

           

           
Write Other Derived Routines, , Write the Derived Creation Routine, Deriving a New Hash Table Type
        
        

           

           

           

           
SUBSUBSECTION
        
        

           

           

           

           
	Write other derived routines
        
        

           

           

           

           
 
        
        

           

           

           

           
	You will want to write other routines for your new hash table,
        
        

           

           

           

           
	as well.
        
        

           

           

           

           
 
        
        

           

           

           

           
	You will want an initialization routine which calls the
        
        

           

           

           

           
	initialization routine of the hash table you are deriving from
        
        

           

           

           

           
	and initializes any other local fields.  For the linker hash
        
        

           

           

           

           
	table, this is <<_bfd_link_hash_table_init>> in <>.
        
        

           

           

           

           
 
        
        

           

           

           

           
	You will want a lookup routine which calls the lookup routine
        
        

           

           

           

           
	of the hash table you are deriving from and casts the result.
        
        

           

           

           

           
	The linker hash table uses <> in
        
        

           

           

           

           
	<> (this actually takes an additional argument which
        
        

           

           

           

           
	it uses to decide how to return the looked up value).
        
        

           

           

           

           
 
        
        

           

           

           

           
	You may want a traversal routine.  This should just call the
        
        

           

           

           

           
	traversal routine of the hash table you are deriving from with
        
        

           

           

           

           
	appropriate casts.  The linker hash table uses
        
        

           

           

           

           
	<> in <>.
        
        

           

           

           

           
 
        
        

           

           

           

           
	These routines may simply be defined as macros.  For example,
        
        

           

           

           

           
	the a.out backend linker hash table, which is derived from the
        
        

           

           

           

           
	linker hash table, uses macros for the lookup and traversal
        
        

           

           

           

           
	routines.  These are <> and
        
        

           

           

           

           
	<> in aoutx.h.
        
        

           

           

           

           
*/
        
        

           

           

           

           
 
        
        

           

           

           

           
/* The default number of entries to use when creating a hash table.  */
        
        

           

           

           

           
#define DEFAULT_SIZE 4051
        
        

           

           

           

           
 
        
        

           

           

           

           
/* The following function returns a nearest prime number which is
        
        

           

           

           

           
   greater than N, and near a power of two.  Copied from libiberty.
        
        

           

           

           

           
   Returns zero for ridiculously large N to signify an error.  */
        
        

           

           

           

           
 
        
        

           

           

           

           
static unsigned long
        
        

           

           

           

           
higher_prime_number (unsigned long n)
        
        

           

           

           

           
{
        
        

           

           

           

           
  /* These are primes that are near, but slightly smaller than, a
        
        

           

           

           

           
     power of two.  */
        
        

           

           

           

           
  static const unsigned long primes[] =
        
        

           

           

           

           
    {
        
        

           

           

           

           
      (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),
        
        

           

           

           

           
  };
        
        

           

           

           

           
 
        
        

           

           

           

           
  const unsigned long *low = &primes[0];
        
        

           

           

           

           
  const unsigned long *high = &primes[sizeof (primes) / sizeof (primes[0])];
        
        

           

           

           

           
 
        
        

           

           

           

           
  while (low != high)
        
        

           

           

           

           
    {
        
        

           

           

           

           
      const unsigned long *mid = low + (high - low) / 2;
        
        

           

           

           

           
      if (n >= *mid)
        
        

           

           

           

           
	low = mid + 1;
        
        

           

           

           

           
      else
        
        

           

           

           

           
	high = mid;
        
        

           

           

           

           
    }
        
        

           

           

           

           
 
        
        

           

           

           

           
  if (n >= *low)
        
        

           

           

           

           
    return 0;
        
        

           

           

           

           
 
        
        

           

           

           

           
  return *low;
        
        

           

           

           

           
}
        
        

           

           

           

           
 
        
        

           

           

           

           
static unsigned long bfd_default_hash_table_size = DEFAULT_SIZE;
        
        

           

           

           

           
 
        
        

           

           

           

           
/* Create a new hash table, given a number of entries.  */
        
        

           

           

           

           
 
        
        

           

           

           

           
bfd_boolean
        
        

           

           

           

           
bfd_hash_table_init_n (struct bfd_hash_table *table,
        
        

           

           

           

           
		       struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *,
        
        

           

           

           

           
							  struct bfd_hash_table *,
        
        

           

           

           

           
							  const char *),
        
        

           

           

           

           
		       unsigned int entsize,
        
        

           

           

           

           
		       unsigned int size)
        
        

           

           

           

           
{
        
        

           

           

           

           
  unsigned long alloc;
        
        

           

           

           

           
 
        
        

           

           

           

           
  alloc = size;
        
        

           

           

           

           
  alloc *= sizeof (struct bfd_hash_entry *);
        
        

           

           

           

           
  if (alloc / sizeof (struct bfd_hash_entry *) != size)
        
        

           

           

           

           
    {
        
        

           

           

           

           
      bfd_set_error (bfd_error_no_memory);
        
        

           

           

           

           
      return FALSE;
        
        

           

           

           

           
    }
        
        

           

           

           

           
 
        
        

           

           

           

           
  table->memory = (void *) objalloc_create ();
        
        

           

           

           

           
  if (table->memory == NULL)
        
        

           

           

           

           
    {
        
        

           

           

           

           
      bfd_set_error (bfd_error_no_memory);
        
        

           

           

           

           
      return FALSE;
        
        

           

           

           

           
    }
        
        

           

           

           

           
  table->table = (struct bfd_hash_entry **)
        
        

           

           

           

           
      objalloc_alloc ((struct objalloc *) table->memory, alloc);
        
        

           

           

           

           
  if (table->table == NULL)
        
        

           

           

           

           
    {
        
        

           

           
serge
           

           
      bfd_hash_table_free (table);
        
        

           

           
serge
           

           
      bfd_set_error (bfd_error_no_memory);
        
        

           

           

           

           
      return FALSE;
        
        

           

           

           

           
    }
        
        

           

           

           

           
  memset ((void *) table->table, 0, alloc);
        
        

           

           

           

           
  table->size = size;
        
        

           

           

           

           
  table->entsize = entsize;
        
        

           

           

           

           
  table->count = 0;
        
        

           

           

           

           
  table->frozen = 0;
        
        

           

           

           

           
  table->newfunc = newfunc;
        
        

           

           

           

           
  return TRUE;
        
        

           

           

           

           
}
        
        

           

           

           

           
 
        
        

           

           

           

           
/* Create a new hash table with the default number of entries.  */
        
        

           

           

           

           
 
        
        

           

           

           

           
bfd_boolean
        
        

           

           

           

           
bfd_hash_table_init (struct bfd_hash_table *table,
        
        

           

           

           

           
		     struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *,
        
        

           

           

           

           
							struct bfd_hash_table *,
        
        

           

           

           

           
							const char *),
        
        

           

           

           

           
		     unsigned int entsize)
        
        

           

           

           

           
{
        
        

           

           

           

           
  return bfd_hash_table_init_n (table, newfunc, entsize,
        
        

           

           

           

           
				bfd_default_hash_table_size);
        
        

           

           

           

           
}
        
        

           

           

           

           
 
        
        

           

           

           

           
/* Free a hash table.  */
        
        

           

           

           

           
 
        
        

           

           

           

           
void
        
        

           

           

           

           
bfd_hash_table_free (struct bfd_hash_table *table)
        
        

           

           

           

           
{
        
        

           

           

           

           
  objalloc_free ((struct objalloc *) table->memory);
        
        

           

           

           

           
  table->memory = NULL;
        
        

           

           

           

           
}
        
        

           

           

           

           
 
        
        

           

           

           

           
static inline unsigned long
        
        

           

           

           

           
bfd_hash_hash (const char *string, unsigned int *lenp)
        
        

           

           

           

           
{
        
        

           

           

           

           
  const unsigned char *s;
        
        

           

           

           

           
  unsigned long hash;
        
        

           

           

           

           
  unsigned int len;
        
        

           

           

           

           
  unsigned int c;
        
        

           

           

           

           
 
        
        

           

           

           

           
  hash = 0;
        
        

           

           

           

           
  len = 0;
        
        

           

           

           

           
  s = (const unsigned char *) string;
        
        

           

           

           

           
  while ((c = *s++) != '\0')
        
        

           

           

           

           
    {
        
        

           

           

           

           
      hash += c + (c << 17);
        
        

           

           

           

           
      hash ^= hash >> 2;
        
        

           

           

           

           
    }
        
        

           

           

           

           
  len = (s - (const unsigned char *) string) - 1;
        
        

           

           

           

           
  hash += len + (len << 17);
        
        

           

           

           

           
  hash ^= hash >> 2;
        
        

           

           

           

           
  if (lenp != NULL)
        
        

           

           

           

           
    *lenp = len;
        
        

           

           

           

           
  return hash;
        
        

           

           

           

           
}
        
        

           

           

           

           
 
        
        

           

           

           

           
/* Look up a string in a hash table.  */
        
        

           

           

           

           
 
        
        

           

           

           

           
struct bfd_hash_entry *
        
        

           

           

           

           
bfd_hash_lookup (struct bfd_hash_table *table,
        
        

           

           

           

           
		 const char *string,
        
        

           

           

           

           
		 bfd_boolean create,
        
        

           

           

           

           
		 bfd_boolean copy)
        
        

           

           

           

           
{
        
        

           

           

           

           
  unsigned long hash;
        
        

           

           

           

           
  struct bfd_hash_entry *hashp;
        
        

           

           

           

           
  unsigned int len;
        
        

           

           

           

           
  unsigned int _index;
        
        

           

           

           

           
 
        
        

           

           

           

           
  hash = bfd_hash_hash (string, &len);
        
        

           

           

           

           
  _index = hash % table->size;
        
        

           

           

           

           
  for (hashp = table->table[_index];
        
        

           

           

           

           
       hashp != NULL;
        
        

           

           

           

           
       hashp = hashp->next)
        
        

           

           

           

           
    {
        
        

           

           

           

           
      if (hashp->hash == hash
        
        

           

           

           

           
	  && strcmp (hashp->string, string) == 0)
        
        

           

           

           

           
	return hashp;
        
        

           

           

           

           
    }
        
        

           

           

           

           
 
        
        

           

           

           

           
  if (! create)
        
        

           

           

           

           
    return NULL;
        
        

           

           

           

           
 
        
        

           

           

           

           
  if (copy)
        
        

           

           

           

           
    {
        
        

           

           

           

           
      char *new_string;
        
        

           

           

           

           
 
        
        

           

           

           

           
      new_string = (char *) objalloc_alloc ((struct objalloc *) table->memory,
        
        

           

           

           

           
                                            len + 1);
        
        

           

           

           

           
      if (!new_string)
        
        

           

           

           

           
	{
        
        

           

           

           

           
	  bfd_set_error (bfd_error_no_memory);
        
        

           

           

           

           
	  return NULL;
        
        

           

           

           

           
	}
        
        

           

           

           

           
      memcpy (new_string, string, len + 1);
        
        

           

           

           

           
      string = new_string;
        
        

           

           

           

           
    }
        
        

           

           

           

           
 
        
        

           

           

           

           
  return bfd_hash_insert (table, string, hash);
        
        

           

           

           

           
}
        
        

           

           

           

           
 
        
        

           

           

           

           
/* Insert an entry in a hash table.  */
        
        

           

           

           

           
 
        
        

           

           

           

           
struct bfd_hash_entry *
        
        

           

           

           

           
bfd_hash_insert (struct bfd_hash_table *table,
        
        

           

           

           

           
		 const char *string,
        
        

           

           

           

           
		 unsigned long hash)
        
        

           

           

           

           
{
        
        

           

           

           

           
  struct bfd_hash_entry *hashp;
        
        

           

           

           

           
  unsigned int _index;
        
        

           

           

           

           
 
        
        

           

           

           

           
  hashp = (*table->newfunc) (NULL, table, string);
        
        

           

           

           

           
  if (hashp == NULL)
        
        

           

           

           

           
    return NULL;
        
        

           

           

           

           
  hashp->string = string;
        
        

           

           

           

           
  hashp->hash = hash;
        
        

           

           

           

           
  _index = hash % table->size;
        
        

           

           

           

           
  hashp->next = table->table[_index];
        
        

           

           

           

           
  table->table[_index] = hashp;
        
        

           

           

           

           
  table->count++;
        
        

           

           

           

           
 
        
        

           

           

           

           
  if (!table->frozen && table->count > table->size * 3 / 4)
        
        

           

           

           

           
    {
        
        

           

           

           

           
      unsigned long newsize = higher_prime_number (table->size);
        
        

           

           

           

           
      struct bfd_hash_entry **newtable;
        
        

           

           

           

           
      unsigned int hi;
        
        

           

           

           

           
      unsigned long alloc = newsize * sizeof (struct bfd_hash_entry *);
        
        

           

           

           

           
 
        
        

           

           

           

           
      /* If we can't find a higher prime, or we can't possibly alloc
        
        

           

           

           

           
	 that much memory, don't try to grow the table.  */
        
        

           

           

           

           
      if (newsize == 0 || alloc / sizeof (struct bfd_hash_entry *) != newsize)
        
        

           

           

           

           
	{
        
        

           

           

           

           
	  table->frozen = 1;
        
        

           

           

           

           
	  return hashp;
        
        

           

           

           

           
	}
        
        

           

           

           

           
 
        
        

           

           

           

           
      newtable = ((struct bfd_hash_entry **)
        
        

           

           

           

           
		  objalloc_alloc ((struct objalloc *) table->memory, alloc));
        
        

           

           

           

           
      if (newtable == NULL)
        
        

           

           

           

           
	{
        
        

           

           

           

           
	  table->frozen = 1;
        
        

           

           

           

           
	  return hashp;
        
        

           

           

           

           
	}
        
        

           

           

           

           
      memset (newtable, 0, alloc);
        
        

           

           

           

           
 
        
        

           

           

           

           
      for (hi = 0; hi < table->size; hi ++)
        
        

           

           

           

           
	while (table->table[hi])
        
        

           

           

           

           
	  {
        
        

           

           

           

           
	    struct bfd_hash_entry *chain = table->table[hi];
        
        

           

           

           

           
	    struct bfd_hash_entry *chain_end = chain;
        
        

           

           

           

           
 
        
        

           

           

           

           
	    while (chain_end->next && chain_end->next->hash == chain->hash)
        
        

           

           

           

           
	      chain_end = chain_end->next;
        
        

           

           

           

           
 
        
        

           

           

           

           
	    table->table[hi] = chain_end->next;
        
        

           

           

           

           
	    _index = chain->hash % newsize;
        
        

           

           

           

           
	    chain_end->next = newtable[_index];
        
        

           

           

           

           
	    newtable[_index] = chain;
        
        

           

           

           

           
	  }
        
        

           

           

           

           
      table->table = newtable;
        
        

           

           

           

           
      table->size = newsize;
        
        

           

           

           

           
    }
        
        

           

           

           

           
 
        
        

           

           

           

           
  return hashp;
        
        

           

           

           

           
}
        
        

           

           

           

           
 
        
        

           

           

           

           
/* Rename an entry in a hash table.  */
        
        

           

           

           

           
 
        
        

           

           

           

           
void
        
        

           

           

           

           
bfd_hash_rename (struct bfd_hash_table *table,
        
        

           

           

           

           
		 const char *string,
        
        

           

           

           

           
		 struct bfd_hash_entry *ent)
        
        

           

           

           

           
{
        
        

           

           

           

           
  unsigned int _index;
        
        

           

           

           

           
  struct bfd_hash_entry **pph;
        
        

           

           

           

           
 
        
        

           

           

           

           
  _index = ent->hash % table->size;
        
        

           

           

           

           
  for (pph = &table->table[_index]; *pph != NULL; pph = &(*pph)->next)
        
        

           

           

           

           
    if (*pph == ent)
        
        

           

           

           

           
      break;
        
        

           

           

           

           
  if (*pph == NULL)
        
        

           

           

           

           
    abort ();
        
        

           

           

           

           
 
        
        

           

           

           

           
  *pph = ent->next;
        
        

           

           

           

           
  ent->string = string;
        
        

           

           

           

           
  ent->hash = bfd_hash_hash (string, NULL);
        
        

           

           

           

           
  _index = ent->hash % table->size;
        
        

           

           

           

           
  ent->next = table->table[_index];
        
        

           

           

           

           
  table->table[_index] = ent;
        
        

           

           

           

           
}
        
        

           

           

           

           
 
        
        

           

           

           

           
/* Replace an entry in a hash table.  */
        
        

           

           

           

           
 
        
        

           

           

           

           
void
        
        

           

           

           

           
bfd_hash_replace (struct bfd_hash_table *table,
        
        

           

           

           

           
		  struct bfd_hash_entry *old,
        
        

           

           

           

           
		  struct bfd_hash_entry *nw)
        
        

           

           

           

           
{
        
        

           

           

           

           
  unsigned int _index;
        
        

           

           

           

           
  struct bfd_hash_entry **pph;
        
        

           

           

           

           
 
        
        

           

           

           

           
  _index = old->hash % table->size;
        
        

           

           

           

           
  for (pph = &table->table[_index];
        
        

           

           

           

           
       (*pph) != NULL;
        
        

           

           

           

           
       pph = &(*pph)->next)
        
        

           

           

           

           
    {
        
        

           

           

           

           
      if (*pph == old)
        
        

           

           

           

           
	{
        
        

           

           

           

           
	  *pph = nw;
        
        

           

           

           

           
	  return;
        
        

           

           

           

           
	}
        
        

           

           

           

           
    }
        
        

           

           

           

           
 
        
        

           

           

           

           
  abort ();
        
        

           

           

           

           
}
        
        

           

           

           

           
 
        
        

           

           

           

           
/* Allocate space in a hash table.  */
        
        

           

           

           

           
 
        
        

           

           

           

           
void *
        
        

           

           

           

           
bfd_hash_allocate (struct bfd_hash_table *table,
        
        

           

           

           

           
		   unsigned int size)
        
        

           

           

           

           
{
        
        

           

           

           

           
  void * ret;
        
        

           

           

           

           
 
        
        

           

           

           

           
  ret = objalloc_alloc ((struct objalloc *) table->memory, size);
        
        

           

           

           

           
  if (ret == NULL && size != 0)
        
        

           

           

           

           
    bfd_set_error (bfd_error_no_memory);
        
        

           

           

           

           
  return ret;
        
        

           

           

           

           
}
        
        

           

           

           

           
 
        
        

           

           

           

           
/* Base method for creating a new hash table entry.  */
        
        

           

           

           

           
 
        
        

           

           

           

           
struct bfd_hash_entry *
        
        

           

           

           

           
bfd_hash_newfunc (struct bfd_hash_entry *entry,
        
        

           

           

           

           
		  struct bfd_hash_table *table,
        
        

           

           

           

           
		  const char *string ATTRIBUTE_UNUSED)
        
        

           

           

           

           
{
        
        

           

           

           

           
  if (entry == NULL)
        
        

           

           

           

           
    entry = (struct bfd_hash_entry *) bfd_hash_allocate (table,
        
        

           

           

           

           
                                                         sizeof (* entry));
        
        

           

           

           

           
  return entry;
        
        

           

           

           

           
}
        
        

           

           

           

           
 
        
        

           

           

           

           
/* Traverse a hash table.  */
        
        

           

           

           

           
 
        
        

           

           

           

           
void
        
        

           

           

           

           
bfd_hash_traverse (struct bfd_hash_table *table,
        
        

           

           

           

           
		   bfd_boolean (*func) (struct bfd_hash_entry *, void *),
        
        

           

           

           

           
		   void * info)
        
        

           

           

           

           
{
        
        

           

           

           

           
  unsigned int i;
        
        

           

           

           

           
 
        
        

           

           

           

           
  table->frozen = 1;
        
        

           

           

           

           
  for (i = 0; i < table->size; i++)
        
        

           

           

           

           
    {
        
        

           

           

           

           
      struct bfd_hash_entry *p;
        
        

           

           

           

           
 
        
        

           

           

           

           
      for (p = table->table[i]; p != NULL; p = p->next)
        
        

           

           

           

           
	if (! (*func) (p, info))
        
        

           

           

           

           
	  goto out;
        
        

           

           

           

           
    }
        
        

           

           

           

           
 out:
        
        

           

           

           

           
  table->frozen = 0;
        
        

           

           

           

           
}
        
        

           

           

           

           
 
        
        

           

           

           

           
unsigned long
        
        

           

           

           

           
bfd_hash_set_default_size (unsigned long hash_size)
        
        

           

           

           

           
{
        
        

           

           

           

           
  /* Extend this prime list if you want more granularity of hash table size.  */
        
        

           

           

           

           
  static const unsigned long hash_size_primes[] =
        
        

           

           

           

           
    {
        
        

           

           

           

           
      31, 61, 127, 251, 509, 1021, 2039, 4091, 8191, 16381, 32749, 65537
        
        

           

           

           

           
    };
        
        

           

           

           

           
  unsigned int _index;
        
        

           

           

           

           
 
        
        

           

           

           

           
  /* Work out best prime number near the hash_size.  */
        
        

           

           

           

           
  for (_index = 0; _index < ARRAY_SIZE (hash_size_primes) - 1; ++_index)
        
        

           

           

           

           
    if (hash_size <= hash_size_primes[_index])
        
        

           

           

           

           
      break;
        
        

           

           

           

           
 
        
        

           

           

           

           
  bfd_default_hash_table_size = hash_size_primes[_index];
        
        

           

           

           

           
  return bfd_default_hash_table_size;
        
        

           

           

           

           
}
        
        

           

           

           

           
 
        
        

           

           

           

           
/* A few different object file formats (a.out, COFF, ELF) use a string
        
        

           

           

           

           
   table.  These functions support adding strings to a string table,
        
        

           

           

           

           
   returning the byte offset, and writing out the table.
        
        

           

           

           

           
 
        
        

           

           

           

           
   Possible improvements:
        
        

           

           

           

           
   + look for strings matching trailing substrings of other strings
        
        

           

           

           

           
   + better data structures?  balanced trees?
        
        

           

           

           

           
   + look at reducing memory use elsewhere -- maybe if we didn't have
        
        

           

           

           

           
     to construct the entire symbol table at once, we could get by
        
        

           

           

           

           
     with smaller amounts of VM?  (What effect does that have on the
        
        

           

           

           

           
     string table reductions?)  */
        
        

           

           

           

           
 
        
        

           

           

           

           
/* An entry in the strtab hash table.  */
        
        

           

           

           

           
 
        
        

           

           

           

           
struct strtab_hash_entry
        
        

           

           

           

           
{
        
        

           

           

           

           
  struct bfd_hash_entry root;
        
        

           

           

           

           
  /* Index in string table.  */
        
        

           

           

           

           
  bfd_size_type index;
        
        

           

           

           

           
  /* Next string in strtab.  */
        
        

           

           

           

           
  struct strtab_hash_entry *next;
        
        

           

           

           

           
};
        
        

           

           

           

           
 
        
        

           

           

           

           
/* The strtab hash table.  */
        
        

           

           

           

           
 
        
        

           

           

           

           
struct bfd_strtab_hash
        
        

           

           

           

           
{
        
        

           

           

           

           
  struct bfd_hash_table table;
        
        

           

           

           

           
  /* Size of strtab--also next available index.  */
        
        

           

           

           

           
  bfd_size_type size;
        
        

           

           

           

           
  /* First string in strtab.  */
        
        

           

           

           

           
  struct strtab_hash_entry *first;
        
        

           

           

           

           
  /* Last string in strtab.  */
        
        

           

           

           

           
  struct strtab_hash_entry *last;
        
        

           

           

           

           
  /* Whether to precede strings with a two byte length, as in the
        
        

           

           

           

           
     XCOFF .debug section.  */
        
        

           

           

           

           
  bfd_boolean xcoff;
        
        

           

           

           

           
};
        
        

           

           

           

           
 
        
        

           

           

           

           
/* Routine to create an entry in a strtab.  */
        
        

           

           

           

           
 
        
        

           

           

           

           
static struct bfd_hash_entry *
        
        

           

           

           

           
strtab_hash_newfunc (struct bfd_hash_entry *entry,
        
        

           

           

           

           
		     struct bfd_hash_table *table,
        
        

           

           

           

           
		     const char *string)
        
        

           

           

           

           
{
        
        

           

           

           

           
  struct strtab_hash_entry *ret = (struct strtab_hash_entry *) entry;
        
        

           

           

           

           
 
        
        

           

           

           

           
  /* Allocate the structure if it has not already been allocated by a
        
        

           

           

           

           
     subclass.  */
        
        

           

           

           

           
  if (ret == NULL)
        
        

           

           

           

           
    ret = (struct strtab_hash_entry *) bfd_hash_allocate (table,
        
        

           

           

           

           
                                                          sizeof (* ret));
        
        

           

           

           

           
  if (ret == NULL)
        
        

           

           

           

           
    return NULL;
        
        

           

           

           

           
 
        
        

           

           

           

           
  /* Call the allocation method of the superclass.  */
        
        

           

           

           

           
  ret = (struct strtab_hash_entry *)
        
        

           

           

           

           
	 bfd_hash_newfunc ((struct bfd_hash_entry *) ret, table, string);
        
        

           

           

           

           
 
        
        

           

           

           

           
  if (ret)
        
        

           

           

           

           
    {
        
        

           

           

           

           
      /* Initialize the local fields.  */
        
        

           

           

           

           
      ret->index = (bfd_size_type) -1;
        
        

           

           

           

           
      ret->next = NULL;
        
        

           

           

           

           
    }
        
        

           

           

           

           
 
        
        

           

           

           

           
  return (struct bfd_hash_entry *) ret;
        
        

           

           

           

           
}
        
        

           

           

           

           
 
        
        

           

           

           

           
/* Look up an entry in an strtab.  */
        
        

           

           

           

           
 
        
        

           

           

           

           
#define strtab_hash_lookup(t, string, create, copy) \
        
        

           

           

           

           
  ((struct strtab_hash_entry *) \
        
        

           

           

           

           
   bfd_hash_lookup (&(t)->table, (string), (create), (copy)))
        
        

           

           

           

           
 
        
        

           

           

           

           
/* Create a new strtab.  */
        
        

           

           

           

           
 
        
        

           

           

           

           
struct bfd_strtab_hash *
        
        

           

           

           

           
_bfd_stringtab_init (void)
        
        

           

           

           

           
{
        
        

           

           

           

           
  struct bfd_strtab_hash *table;
        
        

           

           

           

           
  bfd_size_type amt = sizeof (* table);
        
        

           

           

           

           
 
        
        

           

           

           

           
  table = (struct bfd_strtab_hash *) bfd_malloc (amt);
        
        

           

           

           

           
  if (table == NULL)
        
        

           

           

           

           
    return NULL;
        
        

           

           

           

           
 
        
        

           

           

           

           
  if (!bfd_hash_table_init (&table->table, strtab_hash_newfunc,
        
        

           

           

           

           
			    sizeof (struct strtab_hash_entry)))
        
        

           

           

           

           
    {
        
        

           

           

           

           
      free (table);
        
        

           

           

           

           
      return NULL;
        
        

           

           

           

           
    }
        
        

           

           

           

           
 
        
        

           

           

           

           
  table->size = 0;
        
        

           

           

           

           
  table->first = NULL;
        
        

           

           

           

           
  table->last = NULL;
        
        

           

           

           

           
  table->xcoff = FALSE;
        
        

           

           

           

           
 
        
        

           

           

           

           
  return table;
        
        

           

           

           

           
}
        
        

           

           

           

           
 
        
        

           

           

           

           
/* Create a new strtab in which the strings are output in the format
        
        

           

           

           

           
   used in the XCOFF .debug section: a two byte length precedes each
        
        

           

           

           

           
   string.  */
        
        

           

           

           

           
 
        
        

           

           

           

           
struct bfd_strtab_hash *
        
        

           

           

           

           
_bfd_xcoff_stringtab_init (void)
        
        

           

           

           

           
{
        
        

           

           

           

           
  struct bfd_strtab_hash *ret;
        
        

           

           

           

           
 
        
        

           

           

           

           
  ret = _bfd_stringtab_init ();
        
        

           

           

           

           
  if (ret != NULL)
        
        

           

           

           

           
    ret->xcoff = TRUE;
        
        

           

           

           

           
  return ret;
        
        

           

           

           

           
}
        
        

           

           

           

           
 
        
        

           

           

           

           
/* Free a strtab.  */
        
        

           

           

           

           
 
        
        

           

           

           

           
void
        
        

           

           

           

           
_bfd_stringtab_free (struct bfd_strtab_hash *table)
        
        

           

           

           

           
{
        
        

           

           

           

           
  bfd_hash_table_free (&table->table);
        
        

           

           

           

           
  free (table);
        
        

           

           

           

           
}
        
        

           

           

           

           
 
        
        

           

           

           

           
/* Get the index of a string in a strtab, adding it if it is not
        
        

           

           

           

           
   already present.  If HASH is FALSE, we don't really use the hash
        
        

           

           

           

           
   table, and we don't eliminate duplicate strings.  If COPY is true
        
        

           

           

           

           
   then store a copy of STR if creating a new entry.  */
        
        

           

           

           

           
 
        
        

           

           

           

           
bfd_size_type
        
        

           

           

           

           
_bfd_stringtab_add (struct bfd_strtab_hash *tab,
        
        

           

           

           

           
		    const char *str,
        
        

           

           

           

           
		    bfd_boolean hash,
        
        

           

           

           

           
		    bfd_boolean copy)
        
        

           

           

           

           
{
        
        

           

           

           

           
  struct strtab_hash_entry *entry;
        
        

           

           

           

           
 
        
        

           

           

           

           
  if (hash)
        
        

           

           

           

           
    {
        
        

           

           

           

           
      entry = strtab_hash_lookup (tab, str, TRUE, copy);
        
        

           

           

           

           
      if (entry == NULL)
        
        

           

           

           

           
	return (bfd_size_type) -1;
        
        

           

           

           

           
    }
        
        

           

           

           

           
  else
        
        

           

           

           

           
    {
        
        

           

           

           

           
      entry = (struct strtab_hash_entry *) bfd_hash_allocate (&tab->table,
        
        

           

           

           

           
                                                              sizeof (* entry));
        
        

           

           

           

           
      if (entry == NULL)
        
        

           

           

           

           
	return (bfd_size_type) -1;
        
        

           

           

           

           
      if (! copy)
        
        

           

           

           

           
	entry->root.string = str;
        
        

           

           

           

           
      else
        
        

           

           

           

           
	{
        
        

           

           

           

           
	  size_t len = strlen (str) + 1;
        
        

           

           

           

           
	  char *n;
        
        

           

           

           

           
 
        
        

           

           

           

           
	  n = (char *) bfd_hash_allocate (&tab->table, len);
        
        

           

           

           

           
	  if (n == NULL)
        
        

           

           

           

           
	    return (bfd_size_type) -1;
        
        

           

           

           

           
          memcpy (n, str, len);
        
        

           

           

           

           
	  entry->root.string = n;
        
        

           

           

           

           
	}
        
        

           

           

           

           
      entry->index = (bfd_size_type) -1;
        
        

           

           

           

           
      entry->next = NULL;
        
        

           

           

           

           
    }
        
        

           

           

           

           
 
        
        

           

           

           

           
  if (entry->index == (bfd_size_type) -1)
        
        

           

           

           

           
    {
        
        

           

           

           

           
      entry->index = tab->size;
        
        

           

           

           

           
      tab->size += strlen (str) + 1;
        
        

           

           

           

           
      if (tab->xcoff)
        
        

           

           

           

           
	{
        
        

           

           

           

           
	  entry->index += 2;
        
        

           

           

           

           
	  tab->size += 2;
        
        

           

           

           

           
	}
        
        

           

           

           

           
      if (tab->first == NULL)
        
        

           

           

           

           
	tab->first = entry;
        
        

           

           

           

           
      else
        
        

           

           

           

           
	tab->last->next = entry;
        
        

           

           

           

           
      tab->last = entry;
        
        

           

           

           

           
    }
        
        

           

           

           

           
 
        
        

           

           

           

           
  return entry->index;
        
        

           

           

           

           
}
        
        

           

           

           

           
 
        
        

           

           

           

           
/* Get the number of bytes in a strtab.  */
        
        

           

           

           

           
 
        
        

           

           

           

           
bfd_size_type
        
        

           

           

           

           
_bfd_stringtab_size (struct bfd_strtab_hash *tab)
        
        

           

           

           

           
{
        
        

           

           

           

           
  return tab->size;
        
        

           

           

           

           
}
        
        

           

           

           

           
 
        
        

           

           

           

           
/* Write out a strtab.  ABFD must already be at the right location in
        
        

           

           

           

           
   the file.  */
        
        

           

           

           

           
 
        
        

           

           

           

           
bfd_boolean
        
        

           

           

           

           
_bfd_stringtab_emit (bfd *abfd, struct bfd_strtab_hash *tab)
        
        

           

           

           

           
{
        
        

           

           

           

           
  bfd_boolean xcoff;
        
        

           

           

           

           
  struct strtab_hash_entry *entry;
        
        

           

           

           

           
 
        
        

           

           

           

           
  xcoff = tab->xcoff;
        
        

           

           

           

           
 
        
        

           

           

           

           
  for (entry = tab->first; entry != NULL; entry = entry->next)
        
        

           

           

           

           
    {
        
        

           

           

           

           
      const char *str;
        
        

           

           

           

           
      size_t len;
        
        

           

           

           

           
 
        
        

           

           

           

           
      str = entry->root.string;
        
        

           

           

           

           
      len = strlen (str) + 1;
        
        

           

           

           

           
 
        
        

           

           

           

           
      if (xcoff)
        
        

           

           

           

           
	{
        
        

           

           

           

           
	  bfd_byte buf[2];
        
        

           

           

           

           
 
        
        

           

           

           

           
	  /* The output length includes the null byte.  */
        
        

           

           

           

           
	  bfd_put_16 (abfd, (bfd_vma) len, buf);
        
        

           

           

           

           
	  if (bfd_bwrite ((void *) buf, (bfd_size_type) 2, abfd) != 2)
        
        

           

           

           

           
	    return FALSE;
        
        

           

           

           

           
	}
        
        

           

           

           

           
 
        
        

           

           

           

           
      if (bfd_bwrite ((void *) str, (bfd_size_type) len, abfd) != len)
        
        

           

           

           

           
	return FALSE;
        
        

           

           

           

           
    }
        
        

           

           

           

           
 
        
        

           

           

           

           
  return TRUE;
        
        

           

           

           

           
}