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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.
This commit is contained in:
Tom Tromey 2020-05-27 11:48:18 -06:00
parent 7d00ffecd2
commit af0b2a3e85
3 changed files with 28 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
gdb/ChangeLog
View File

@ -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

22
gdb/dwarf2/abbrev.c
View File

@ -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

13
gdb/dwarf2/abbrev.h
View File

@ -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;