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http://sourceware.org/ml/gdb-cvs/2013-05/msg00141.html
### src/gdb/ChangeLog 2013/05/17 06:58:33 1.15565
### src/gdb/ChangeLog 2013/05/17 08:34:18 1.15566
## -1,3 +1,18 @@
+2013-05-17 Phil Muldoon <pmuldoon@redhat.com>
+
+ * frame.c (frame_stash): Convert to htab.
+ (frame_addr_hash): New function.
+ (frame_addr_hash_eq): New function.
+ (frame_stash_create): Convert function to create
+ a hash table.
+ (frame_stash_add): Convert function to add an entry to a hash
+ table.
+ (frame_stash_find): Convert function to search the hash table.
+ (frame_stash_invalidate): Convert function to empty the hash
+ table.
+ (get_frame_id): Only add to stash if a frame_id is created.
+ (_initialize_frame): Call frame_stash_create.
+
2013-05-16 Yue Lu <hacklu.newborn@gmail.com> (tiny change)
* configure.ac: Ensure MIG is available when building for GNU Hurd
--- src/gdb/frame.c 2013/04/10 15:11:11 1.317
+++ src/gdb/frame.c 2013/05/17 08:34:18 1.318
@@ -43,6 +43,7 @@
#include "block.h"
#include "inline-frame.h"
#include "tracepoint.h"
+#include "hashtab.h"
static struct frame_info *get_prev_frame_1 (struct frame_info *this_frame);
static struct frame_info *get_prev_frame_raw (struct frame_info *this_frame);
@@ -128,38 +129,107 @@
enum unwind_stop_reason stop_reason;
};
-/* A frame stash used to speed up frame lookups. */
+/* A frame stash used to speed up frame lookups. Create a hash table
+ to stash frames previously accessed from the frame cache for
+ quicker subsequent retrieval. The hash table is emptied whenever
+ the frame cache is invalidated. */
+
+static htab_t frame_stash;
+
+/* Internal function to calculate a hash from the frame_id addresses,
+ using as many valid addresses as possible. Frames below level 0
+ are not stored in the hash table. */
+
+static hashval_t
+frame_addr_hash (const void *ap)
+{
+ const struct frame_info *frame = ap;
+ const struct frame_id f_id = frame->this_id.value;
+ hashval_t hash = 0;
+
+ gdb_assert (f_id.stack_addr_p || f_id.code_addr_p
+ || f_id.special_addr_p);
+
+ if (f_id.stack_addr_p)
+ hash = iterative_hash (&f_id.stack_addr,
+ sizeof (f_id.stack_addr), hash);
+ if (f_id.code_addr_p)
+ hash = iterative_hash (&f_id.code_addr,
+ sizeof (f_id.code_addr), hash);
+ if (f_id.special_addr_p)
+ hash = iterative_hash (&f_id.special_addr,
+ sizeof (f_id.special_addr), hash);
-/* We currently only stash one frame at a time, as this seems to be
- sufficient for now. */
-static struct frame_info *frame_stash = NULL;
+ return hash;
+}
+
+/* Internal equality function for the hash table. This function
+ defers equality operations to frame_id_eq. */
+
+static int
+frame_addr_hash_eq (const void *a, const void *b)
+{
+ const struct frame_info *f_entry = a;
+ const struct frame_info *f_element = b;
-/* Add the following FRAME to the frame stash. */
+ return frame_id_eq (f_entry->this_id.value,
+ f_element->this_id.value);
+}
+
+/* Internal function to create the frame_stash hash table. 100 seems
+ to be a good compromise to start the hash table at. */
+
+static void
+frame_stash_create (void)
+{
+ frame_stash = htab_create (100,
+ frame_addr_hash,
+ frame_addr_hash_eq,
+ NULL);
+}
+
+/* Internal function to add a frame to the frame_stash hash table. Do
+ not store frames below 0 as they may not have any addresses to
+ calculate a hash. */
static void
frame_stash_add (struct frame_info *frame)
{
- frame_stash = frame;
+ /* Do not stash frames below level 0. */
+ if (frame->level >= 0)
+ {
+ struct frame_info **slot;
+
+ slot = (struct frame_info **) htab_find_slot (frame_stash,
+ frame,
+ INSERT);
+ *slot = frame;
+ }
}
-/* Search the frame stash for an entry with the given frame ID.
- If found, return that frame. Otherwise return NULL. */
+/* Internal function to search the frame stash for an entry with the
+ given frame ID. If found, return that frame. Otherwise return
+ NULL. */
static struct frame_info *
frame_stash_find (struct frame_id id)
{
- if (frame_stash && frame_id_eq (frame_stash->this_id.value, id))
- return frame_stash;
+ struct frame_info dummy;
+ struct frame_info *frame;
- return NULL;
+ dummy.this_id.value = id;
+ frame = htab_find (frame_stash, &dummy);
+ return frame;
}
-/* Invalidate the frame stash by removing all entries in it. */
+/* Internal function to invalidate the frame stash by removing all
+ entries in it. This only occurs when the frame cache is
+ invalidated. */
static void
frame_stash_invalidate (void)
{
- frame_stash = NULL;
+ htab_empty (frame_stash);
}
/* Flag to control debugging. */
@@ -345,10 +415,9 @@
fprint_frame_id (gdb_stdlog, fi->this_id.value);
fprintf_unfiltered (gdb_stdlog, " }\n");
}
+ frame_stash_add (fi);
}
- frame_stash_add (fi);
-
return fi->this_id.value;
}
@@ -2451,6 +2520,8 @@
{
obstack_init (&frame_cache_obstack);
+ frame_stash_create ();
+
observer_attach_target_changed (frame_observer_target_changed);
add_prefix_cmd ("backtrace", class_maintenance, set_backtrace_cmd, _("\