1 files changed, 65 insertions, 8 deletions

diff --git a/gdb/bcache.c b/gdb/bcache.c
index 73b86e8..c5173e1 100644
--- a/gdb/bcache.c
+++ b/gdb/bcache.c
@@ -29,6 +29,50 @@
 #include <stddef.h>
 #include <stdlib.h>
 
+/* The type used to hold a single bcache string.  The user data is
+   stored in d.data.  Since it can be any type, it needs to have the
+   same alignment as the most strict alignment of any type on the host
+   machine.  I don't know of any really correct way to do this in
+   stock ANSI C, so just do it the same way obstack.h does.  */
+
+struct bstring
+{
+  struct bstring *next;
+  size_t length;
+
+  union
+  {
+    char data[1];
+    double dummy;
+  }
+  d;
+};
+
+
+/* The structure for a bcache itself.  The bcache is initialized, in
+   bcache_xmalloc(), by filling it with zeros and then setting the
+   corresponding obstack's malloc() and free() methods.  */
+
+struct bcache
+{
+  /* All the bstrings are allocated here.  */
+  struct obstack cache;
+
+  /* How many hash buckets we're using.  */
+  unsigned int num_buckets;
+  
+  /* Hash buckets.  This table is allocated using malloc, so when we
+     grow the table we can return the old table to the system.  */
+  struct bstring **bucket;
+
+  /* Statistics.  */
+  unsigned long unique_count;	/* number of unique strings */
+  long total_count;	/* total number of strings cached, including dups */
+  long unique_size;	/* size of unique strings, in bytes */
+  long total_size;      /* total number of bytes cached, including dups */
+  long structure_size;	/* total size of bcache, including infrastructure */
+};
+
 /* The old hash function was stolen from SDBM. This is what DB 3.0 uses now,
  * and is better than the old one. 
  */
@@ -166,19 +210,26 @@ bcache (const void *addr, int length, struct bcache *bcache)
 }
 
 
-/* Freeing bcaches.  */
+/* Allocating and freeing bcaches.  */
+
+struct bcache *
+bcache_xmalloc (void)
+{
+  /* Allocate the bcache pre-zeroed.  */
+  struct bcache *b = XCALLOC (1, struct bcache);
+  obstack_specify_allocation (&b->cache, 0, 0, xmalloc, xfree);
+  return b;
+}
 
 /* Free all the storage associated with BCACHE.  */
 void
-free_bcache (struct bcache *bcache)
+bcache_xfree (struct bcache *bcache)
 {
+  if (bcache == NULL)
+    return;
   obstack_free (&bcache->cache, 0);
-  if (bcache->bucket)
-    xfree (bcache->bucket);
-
-  /* This isn't necessary, but at least the bcache is always in a
-     consistent state.  */
-  memset (bcache, 0, sizeof (*bcache));
+  xfree (bcache->bucket);
+  xfree (bcache);
 }
 
 
@@ -291,3 +342,9 @@ print_bcache_statistics (struct bcache *c, char *type)
   printf_filtered ("    Maximum hash chain length: %3d\n", max_chain_length);
   printf_filtered ("\n");
 }
+
+int
+bcache_memory_used (struct bcache *bcache)
+{
+  return obstack_memory_used (&bcache->cache);
+}