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2013-05-17 Phil Muldoon <pmuldoon@redhat.com>

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* 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.
This commit is contained in:
Phil Muldoon 2013-05-17 08:34:18 +00:00
parent bb4168a9a7
commit 3de661e642
2 changed files with 101 additions and 15 deletions
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15
gdb/ChangeLog
View File

@ -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

101
gdb/frame.c
View File

@ -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 @@ struct frame_info
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. */
/* We currently only stash one frame at a time, as this seems to be
sufficient for now. */
static struct frame_info *frame_stash = NULL;
static htab_t frame_stash;
/* Add the following FRAME to the 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);
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;
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 @@ get_frame_id (struct frame_info *fi)
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 @@ _initialize_frame (void)
{
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, _("\