gdb/fortran: Add new 'info modules' command

[deliverable/binutils-gdb.git] / gas / hash.c

diff --git a/gas/hash.c b/gas/hash.c
index a7b82987b20fab32b90b277581d451c433452a8a..cfffede7e2e909648894c2aacafa28318b32b93b 100644 (file)
--- a/gas/hash.c
+++ b/gas/hash.c
@@ -1,13 +1,11 @@
 /* hash.c -- gas hash table code
 /* hash.c -- gas hash table code

-   Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999,
-   2000, 2001, 2002
-   Free Software Foundation, Inc.
+   Copyright (C) 1987-2019 Free Software Foundation, Inc.

 
    This file is part of GAS, the GNU Assembler.
 
    GAS is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
 
    This file is part of GAS, the GNU Assembler.
 
    GAS 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, or (at your option)
+   the Free Software Foundation; either version 3, or (at your option)

    any later version.
 
    GAS is distributed in the hope that it will be useful,
    any later version.
 
    GAS is distributed in the hope that it will be useful,


@@ -17,8 +15,8 @@
 
    You should have received a copy of the GNU General Public License
    along with GAS; see the file COPYING.  If not, write to the Free
 
    You should have received a copy of the GNU General Public License
    along with GAS; see the file COPYING.  If not, write to the Free

-   Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+   Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
+   02110-1301, USA.  */

 
 /* This version of the hash table code is a wholescale replacement of
    the old hash table code, which was fairly bad.  This is based on
 
 /* This version of the hash table code is a wholescale replacement of
    the old hash table code, which was fairly bad.  This is based on


@@ -33,10 +31,6 @@
 #include "safe-ctype.h"
 #include "obstack.h"
 
 #include "safe-ctype.h"
 #include "obstack.h"
 

-/* The default number of entries to use when creating a hash table.  */
-
-#define DEFAULT_SIZE (4051)
-

 /* An entry in a hash table.  */
 
 struct hash_entry {
 /* An entry in a hash table.  */
 
 struct hash_entry {


@@ -48,7 +42,7 @@ struct hash_entry {
      table.  */
   unsigned long hash;
   /* Pointer being stored in the hash table.  */
      table.  */
   unsigned long hash;
   /* Pointer being stored in the hash table.  */

-  PTR data;
+  void *data;

 };
 
 /* A hash table.  */
 };
 
 /* A hash table.  */


@@ -72,18 +66,28 @@ struct hash_control {
 #endif /* HASH_STATISTICS */
 };
 
 #endif /* HASH_STATISTICS */
 };
 

+/* The default number of entries to use when creating a hash table.
+   Note this value can be reduced to 4051 by using the command line
+   switch --reduce-memory-overheads, or set to other values by using
+   the --hash-size=<NUMBER> switch.  */
+
+static unsigned long gas_hash_table_size = 65537;
+
+void
+set_gas_hash_table_size (unsigned long size)
+{
+  gas_hash_table_size = bfd_hash_set_default_size (size);
+}
+

 /* Create a hash table.  This return a control block.  */
 
 struct hash_control *
 /* Create a hash table.  This return a control block.  */
 
 struct hash_control *

-hash_new (void)
+hash_new_sized (unsigned long size)

 {
 {

-  unsigned int size;
+  unsigned long alloc;

   struct hash_control *ret;
   struct hash_control *ret;

-  unsigned int alloc;

 
 

-  size = DEFAULT_SIZE;
-
-  ret = (struct hash_control *) xmalloc (sizeof *ret);
+  ret = XNEW (struct hash_control);

   obstack_begin (&ret->memory, chunksize);
   alloc = size * sizeof (struct hash_entry *);
   ret->table = (struct hash_entry **) obstack_alloc (&ret->memory, alloc);
   obstack_begin (&ret->memory, chunksize);
   alloc = size * sizeof (struct hash_entry *);
   ret->table = (struct hash_entry **) obstack_alloc (&ret->memory, alloc);


@@ -102,6 +106,12 @@ hash_new (void)
   return ret;
 }
 
   return ret;
 }
 

+struct hash_control *
+hash_new (void)
+{
+  return hash_new_sized (gas_hash_table_size);
+}
+

 /* Delete a hash table, freeing all allocated memory.  */
 
 void
 /* Delete a hash table, freeing all allocated memory.  */
 
 void


@@ -120,20 +130,14 @@ hash_die (struct hash_control *table)
    Each time we look up a string, we move it to the start of the list
    for its hash code, to take advantage of referential locality.  */
 
    Each time we look up a string, we move it to the start of the list
    for its hash code, to take advantage of referential locality.  */
 

-static struct hash_entry *hash_lookup (struct hash_control *,
-                                      const char *,
-                                      struct hash_entry ***,
-                                      unsigned long *);
-

 static struct hash_entry *
 static struct hash_entry *

-hash_lookup (struct hash_control *table, const char *key,
+hash_lookup (struct hash_control *table, const char *key, size_t len,

             struct hash_entry ***plist, unsigned long *phash)
 {
             struct hash_entry ***plist, unsigned long *phash)
 {

-  register unsigned long hash;
-  unsigned int len;
-  register const unsigned char *s;
-  register unsigned int c;
-  unsigned int index;
+  unsigned long hash;
+  size_t n;
+  unsigned int c;
+  unsigned int hindex;

   struct hash_entry **list;
   struct hash_entry *p;
   struct hash_entry *prev;
   struct hash_entry **list;
   struct hash_entry *p;
   struct hash_entry *prev;


@@ -143,13 +147,11 @@ hash_lookup (struct hash_control *table, const char *key,
 #endif
 
   hash = 0;
 #endif
 
   hash = 0;

-  len = 0;
-  s = (const unsigned char *) key;
-  while ((c = *s++) != '\0')
+  for (n = 0; n < len; n++)

     {
     {

+      c = key[n];

       hash += c + (c << 17);
       hash ^= hash >> 2;
       hash += c + (c << 17);
       hash ^= hash >> 2;

-      ++len;

     }
   hash += len + (len << 17);
   hash ^= hash >> 2;
     }
   hash += len + (len << 17);
   hash ^= hash >> 2;


@@ -157,8 +159,8 @@ hash_lookup (struct hash_control *table, const char *key,
   if (phash != NULL)
     *phash = hash;
 
   if (phash != NULL)
     *phash = hash;
 

-  index = hash % table->size;
-  list = table->table + index;
+  hindex = hash % table->size;
+  list = table->table + hindex;

 
   if (plist != NULL)
     *plist = list;
 
   if (plist != NULL)
     *plist = list;


@@ -176,7 +178,7 @@ hash_lookup (struct hash_control *table, const char *key,
          ++table->string_compares;
 #endif
 
          ++table->string_compares;
 #endif
 

-         if (strcmp (p->string, key) == 0)
+         if (strncmp (p->string, key, len) == 0 && p->string[len] == '\0')

            {
              if (prev != NULL)
                {
            {
              if (prev != NULL)
                {


@@ -201,13 +203,13 @@ hash_lookup (struct hash_control *table, const char *key,
    hash table.  */
 
 const char *
    hash table.  */
 
 const char *

-hash_insert (struct hash_control *table, const char *key, PTR value)
+hash_insert (struct hash_control *table, const char *key, void *val)

 {
   struct hash_entry *p;
   struct hash_entry **list;
   unsigned long hash;
 
 {
   struct hash_entry *p;
   struct hash_entry **list;
   unsigned long hash;
 

-  p = hash_lookup (table, key, &list, &hash);
+  p = hash_lookup (table, key, strlen (key), &list, &hash);

   if (p != NULL)
     return "exists";
 
   if (p != NULL)
     return "exists";
 


@@ -218,7 +220,7 @@ hash_insert (struct hash_control *table, const char *key, PTR value)
   p = (struct hash_entry *) obstack_alloc (&table->memory, sizeof (*p));
   p->string = key;
   p->hash = hash;
   p = (struct hash_entry *) obstack_alloc (&table->memory, sizeof (*p));
   p->string = key;
   p->hash = hash;

-  p->data = value;
+  p->data = val;

 
   p->next = *list;
   *list = p;
 
   p->next = *list;
   *list = p;


@@ -231,20 +233,20 @@ hash_insert (struct hash_control *table, const char *key, PTR value)
    error.  If an entry already exists, its value is replaced.  */
 
 const char *
    error.  If an entry already exists, its value is replaced.  */
 
 const char *

-hash_jam (struct hash_control *table, const char *key, PTR value)
+hash_jam (struct hash_control *table, const char *key, void *val)

 {
   struct hash_entry *p;
   struct hash_entry **list;
   unsigned long hash;
 
 {
   struct hash_entry *p;
   struct hash_entry **list;
   unsigned long hash;
 

-  p = hash_lookup (table, key, &list, &hash);
+  p = hash_lookup (table, key, strlen (key), &list, &hash);

   if (p != NULL)
     {
 #ifdef HASH_STATISTICS
       ++table->replacements;
 #endif
 
   if (p != NULL)
     {
 #ifdef HASH_STATISTICS
       ++table->replacements;
 #endif
 

-      p->data = value;
+      p->data = val;

     }
   else
     {
     }
   else
     {


@@ -255,7 +257,7 @@ hash_jam (struct hash_control *table, const char *key, PTR value)
       p = (struct hash_entry *) obstack_alloc (&table->memory, sizeof (*p));
       p->string = key;
       p->hash = hash;
       p = (struct hash_entry *) obstack_alloc (&table->memory, sizeof (*p));
       p->string = key;
       p->hash = hash;

-      p->data = value;
+      p->data = val;

 
       p->next = *list;
       *list = p;
 
       p->next = *list;
       *list = p;


@@ -268,13 +270,13 @@ hash_jam (struct hash_control *table, const char *key, PTR value)
    value stored for the entry.  If the entry is not found in the hash
    table, this does nothing and returns NULL.  */
 
    value stored for the entry.  If the entry is not found in the hash
    table, this does nothing and returns NULL.  */
 

-PTR
-hash_replace (struct hash_control *table, const char *key, PTR value)
+void *
+hash_replace (struct hash_control *table, const char *key, void *value)

 {
   struct hash_entry *p;
 {
   struct hash_entry *p;

-  PTR ret;
+  void *ret;

 
 

-  p = hash_lookup (table, key, NULL, NULL);
+  p = hash_lookup (table, key, strlen (key), NULL, NULL);

   if (p == NULL)
     return NULL;
 
   if (p == NULL)
     return NULL;
 


@@ -292,12 +294,27 @@ hash_replace (struct hash_control *table, const char *key, PTR value)
 /* Find an entry in a hash table, returning its value.  Returns NULL
    if the entry is not found.  */
 
 /* Find an entry in a hash table, returning its value.  Returns NULL
    if the entry is not found.  */
 

-PTR
+void *

 hash_find (struct hash_control *table, const char *key)
 {
   struct hash_entry *p;
 
 hash_find (struct hash_control *table, const char *key)
 {
   struct hash_entry *p;
 

-  p = hash_lookup (table, key, NULL, NULL);
+  p = hash_lookup (table, key, strlen (key), NULL, NULL);
+  if (p == NULL)
+    return NULL;
+
+  return p->data;
+}
+
+/* As hash_find, but KEY is of length LEN and is not guaranteed to be
+   NUL-terminated.  */
+
+void *
+hash_find_n (struct hash_control *table, const char *key, size_t len)
+{
+  struct hash_entry *p;
+
+  p = hash_lookup (table, key, len, NULL, NULL);

   if (p == NULL)
     return NULL;
 
   if (p == NULL)
     return NULL;
 


@@ -307,13 +324,13 @@ hash_find (struct hash_control *table, const char *key)
 /* Delete an entry from a hash table.  This returns the value stored
    for that entry, or NULL if there is no such entry.  */
 
 /* Delete an entry from a hash table.  This returns the value stored
    for that entry, or NULL if there is no such entry.  */
 

-PTR
-hash_delete (struct hash_control *table, const char *key)
+void *
+hash_delete (struct hash_control *table, const char *key, int freeme)

 {
   struct hash_entry *p;
   struct hash_entry **list;
 
 {
   struct hash_entry *p;
   struct hash_entry **list;
 

-  p = hash_lookup (table, key, &list, NULL);
+  p = hash_lookup (table, key, strlen (key), &list, NULL);

   if (p == NULL)
     return NULL;
 
   if (p == NULL)
     return NULL;
 


@@ -326,9 +343,8 @@ hash_delete (struct hash_control *table, const char *key)
 
   *list = p->next;
 
 
   *list = p->next;
 

-  /* Note that we never reclaim the memory for this entry.  If gas
-     ever starts deleting hash table entries in a big way, this will
-     have to change.  */
+  if (freeme)
+    obstack_free (&table->memory, p);

 
   return p->data;
 }
 
   return p->data;
 }


@@ -338,7 +354,7 @@ hash_delete (struct hash_control *table, const char *key)
 
 void
 hash_traverse (struct hash_control *table,
 
 void
 hash_traverse (struct hash_control *table,

-              void (*pfn) (const char *key, PTR value))
+              void (*pfn) (const char *key, void *value))

 {
   unsigned int i;
 
 {
   unsigned int i;