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* [binutils-gdb] Inline abbrev lookup
@ 2020-05-27 17:49 Tom Tromey
0 siblings, 0 replies; only message in thread
From: Tom Tromey @ 2020-05-27 17:49 UTC (permalink / raw)
To: gdb-cvs
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=af0b2a3e85df9f49a3528e5b7578fcf9412f1acc
commit af0b2a3e85df9f49a3528e5b7578fcf9412f1acc
Author: Tom Tromey <tromey@adacore.com>
Date: Wed May 27 11:48:18 2020 -0600
Inline abbrev lookup
Profiling showed that calls to abbrev_table::lookup_abbrev were "too
visible". As these are just forwarding calls to the hash table, this
patch inlines the lookup. Also, htab_find_with_hash is used, avoiding
another call.
The run previous to this had times of (see the first patch in the
series for an explanation):
gdb 1.69
libxul 2.02
Ada 2.52
This patch improves the times to:
gdb 1.64
libxul 1.99
Ada 2.47
gdb/ChangeLog
2020-05-27 Tom Tromey <tromey@adacore.com>
* dwarf2/abbrev.h (struct abbrev_table) <lookup_abbrev>: Inline.
Use htab_find_with_hash.
<add_abbrev>: Remove "abbrev_number" parameter.
* dwarf2/abbrev.c (abbrev_table::add_abbrev): Remove
"abbrev_number" parameter. Use htab_find_slot_with_hash.
(hash_abbrev): Add comment.
(abbrev_table::lookup_abbrev): Move to header file.
(abbrev_table::read): Update.
Diff:
---
gdb/ChangeLog | 11 +++++++++++
gdb/dwarf2/abbrev.c | 22 ++++++----------------
gdb/dwarf2/abbrev.h | 13 +++++++++++--
3 files changed, 28 insertions(+), 18 deletions(-)
diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 74b329b8b62..2548ccdbf63 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,14 @@
+2020-05-27 Tom Tromey <tromey@adacore.com>
+
+ * dwarf2/abbrev.h (struct abbrev_table) <lookup_abbrev>: Inline.
+ Use htab_find_with_hash.
+ <add_abbrev>: Remove "abbrev_number" parameter.
+ * dwarf2/abbrev.c (abbrev_table::add_abbrev): Remove
+ "abbrev_number" parameter. Use htab_find_slot_with_hash.
+ (hash_abbrev): Add comment.
+ (abbrev_table::lookup_abbrev): Move to header file.
+ (abbrev_table::read): Update.
+
2020-05-27 Tom Tromey <tromey@adacore.com>
* dwarf2/read.c (struct partial_die_info) <name>: Declare new
diff --git a/gdb/dwarf2/abbrev.c b/gdb/dwarf2/abbrev.c
index b85018060fa..1552594efb5 100644
--- a/gdb/dwarf2/abbrev.c
+++ b/gdb/dwarf2/abbrev.c
@@ -36,6 +36,8 @@ static hashval_t
hash_abbrev (const void *item)
{
const struct abbrev_info *info = (const struct abbrev_info *) item;
+ /* Warning: if you change this next line, you must also update the
+ other code in this class using the _with_hash functions. */
return info->number;
}
@@ -79,25 +81,13 @@ abbrev_table::alloc_abbrev ()
/* Add an abbreviation to the table. */
void
-abbrev_table::add_abbrev (unsigned int abbrev_number,
- struct abbrev_info *abbrev)
+abbrev_table::add_abbrev (struct abbrev_info *abbrev)
{
- void **slot = htab_find_slot (m_abbrevs.get (), abbrev, INSERT);
+ void **slot = htab_find_slot_with_hash (m_abbrevs.get (), abbrev,
+ abbrev->number, INSERT);
*slot = abbrev;
}
-/* Look up an abbrev in the table.
- Returns NULL if the abbrev is not found. */
-
-struct abbrev_info *
-abbrev_table::lookup_abbrev (unsigned int abbrev_number)
-{
- struct abbrev_info search;
- search.number = abbrev_number;
-
- return (struct abbrev_info *) htab_find (m_abbrevs.get (), &search);
-}
-
/* Read in an abbrev table. */
abbrev_table_up
@@ -172,7 +162,7 @@ abbrev_table::read (struct objfile *objfile,
memcpy (cur_abbrev->attrs, cur_attrs.data (),
cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
- abbrev_table->add_abbrev (abbrev_number, cur_abbrev);
+ abbrev_table->add_abbrev (cur_abbrev);
/* Get next abbreviation.
Under Irix6 the abbreviations for a compilation unit are not
diff --git a/gdb/dwarf2/abbrev.h b/gdb/dwarf2/abbrev.h
index b9ace64b448..888f04ebebb 100644
--- a/gdb/dwarf2/abbrev.h
+++ b/gdb/dwarf2/abbrev.h
@@ -27,6 +27,8 @@
#ifndef GDB_DWARF2_ABBREV_H
#define GDB_DWARF2_ABBREV_H
+#include "hashtab.h"
+
/* This data structure holds the information of an abbrev. */
struct abbrev_info
{
@@ -60,8 +62,15 @@ struct abbrev_table
/* Look up an abbrev in the table.
Returns NULL if the abbrev is not found. */
- struct abbrev_info *lookup_abbrev (unsigned int abbrev_number);
+ struct abbrev_info *lookup_abbrev (unsigned int abbrev_number)
+ {
+ struct abbrev_info search;
+ search.number = abbrev_number;
+ return (struct abbrev_info *) htab_find_with_hash (m_abbrevs.get (),
+ &search,
+ abbrev_number);
+ }
/* Where the abbrev table came from.
This is used as a sanity check when the table is used. */
@@ -78,7 +87,7 @@ private:
struct abbrev_info *alloc_abbrev ();
/* Add an abbreviation to the table. */
- void add_abbrev (unsigned int abbrev_number, struct abbrev_info *abbrev);
+ void add_abbrev (struct abbrev_info *abbrev);
/* Hash table of abbrevs. */
htab_up m_abbrevs;
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