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libcpp: preprocessor speedup patches from mainline.

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* lex.c (_cpp_clean_line): Add uses of __builtin_expect.  Don't
look backward at the end of the line unless we saw a backslash.

* internal.h (struct cpp_reader): Add new fields:
nonexistent_file_hash and nonexistent_file_ob.
* files.c: Include "obstack.h".
(find_file_in_dir): Before trying to open the file, look up the
path name in the hash table of nonexistent files.  After failing
to open the file, add the path name to the hash table.
(_cpp_find_file): Cache the results of looking up the file name
starting with the quote and bracket chain heads, if we can.
(nonexistent_file_hash_eq): New static function.
(_cpp_init_files): Initialize pfile->nonexistent_file_hash and
pfile->nonexistent_file_ob.
(_cpp_cleanup_files): Free pfile->nonexistent_file_hash and
pfile->nonexistent_file_ob.

Obtained from:	gcc 4.3 (rev. 120263, 124929 ; GPLv2)
MFC after:	3 weeks
This commit is contained in:
Pedro F. Giffuni 2013-11-16 01:07:02 +00:00
parent 007acff069
commit 966b6fbbae
3 changed files with 98 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

75
contrib/gcclibs/libcpp/files.c
View File

@ -1,6 +1,7 @@
/* Part of CPP library. File handling.
Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1998,
1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
Free Software Foundation, Inc.
Written by Per Bothner, 1994.
Based on CCCP program by Paul Rubin, June 1986
Adapted to ANSI C, Richard Stallman, Jan 1987
@ -26,6 +27,7 @@ Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
#include "cpplib.h"
#include "internal.h"
#include "mkdeps.h"
#include "obstack.h"
#include "hashtab.h"
#include "md5.h"
#include <dirent.h>
@ -322,6 +324,16 @@ find_file_in_dir (cpp_reader *pfile, _cpp_file *file, bool *invalid_pch)
if (path)
{
hashval_t hv = htab_hash_string (path);
char *copy;
void **pp;
if (htab_find_with_hash (pfile->nonexistent_file_hash, path, hv) != NULL)
{
file->err_no = ENOENT;
return false;
}
file->path = path;
if (pch_open_file (pfile, file, invalid_pch))
return true;
@ -335,7 +347,16 @@ find_file_in_dir (cpp_reader *pfile, _cpp_file *file, bool *invalid_pch)
return true;
}
/* We copy the path name onto an obstack partly so that we don't
leak the memory, but mostly so that we don't fragment the
heap. */
copy = obstack_copy0 (&pfile->nonexistent_file_ob, path,
strlen (path));
free (path);
pp = htab_find_slot_with_hash (pfile->nonexistent_file_hash,
copy, hv, INSERT);
*pp = copy;
file->path = file->name;
}
else
@ -396,6 +417,9 @@ _cpp_find_file (cpp_reader *pfile, const char *fname, cpp_dir *start_dir, bool f
struct file_hash_entry *entry, **hash_slot;
_cpp_file *file;
bool invalid_pch = false;
bool saw_bracket_include = false;
bool saw_quote_include = false;
struct cpp_dir *found_in_cache = NULL;
/* Ensure we get no confusion between cached files and directories. */
if (start_dir == NULL)
@ -448,14 +472,20 @@ _cpp_find_file (cpp_reader *pfile, const char *fname, cpp_dir *start_dir, bool f
/* Only check the cache for the starting location (done above)
and the quote and bracket chain heads because there are no
other possible starting points for searches. */
if (file->dir != pfile->bracket_include
&& file->dir != pfile->quote_include)
if (file->dir == pfile->bracket_include)
saw_bracket_include = true;
else if (file->dir == pfile->quote_include)
saw_quote_include = true;
else
continue;
entry = search_cache (*hash_slot, file->dir);
if (entry)
{
found_in_cache = file->dir;
break;
}
}
if (entry)
{
@ -478,6 +508,29 @@ _cpp_find_file (cpp_reader *pfile, const char *fname, cpp_dir *start_dir, bool f
entry->u.file = file;
*hash_slot = entry;
/* If we passed the quote or bracket chain heads, cache them also.
This speeds up processing if there are lots of -I options. */
if (saw_bracket_include
&& pfile->bracket_include != start_dir
&& found_in_cache != pfile->bracket_include)
{
entry = new_file_hash_entry (pfile);
entry->next = *hash_slot;
entry->start_dir = pfile->bracket_include;
entry->u.file = file;
*hash_slot = entry;
}
if (saw_quote_include
&& pfile->quote_include != start_dir
&& found_in_cache != pfile->quote_include)
{
entry = new_file_hash_entry (pfile);
entry->next = *hash_slot;
entry->start_dir = pfile->quote_include;
entry->u.file = file;
*hash_slot = entry;
}
return file;
}
@ -997,6 +1050,14 @@ file_hash_eq (const void *p, const void *q)
return strcmp (hname, fname) == 0;
}
/* Compare entries in the nonexistent file hash table. These are just
strings. */
static int
nonexistent_file_hash_eq (const void *p, const void *q)
{
return strcmp (p, q) == 0;
}
/* Initialize everything in this source file. */
void
_cpp_init_files (cpp_reader *pfile)
@ -1006,6 +1067,12 @@ _cpp_init_files (cpp_reader *pfile)
pfile->dir_hash = htab_create_alloc (127, file_hash_hash, file_hash_eq,
NULL, xcalloc, free);
allocate_file_hash_entries (pfile);
pfile->nonexistent_file_hash = htab_create_alloc (127, htab_hash_string,
nonexistent_file_hash_eq,
NULL, xcalloc, free);
_obstack_begin (&pfile->nonexistent_file_ob, 0, 0,
(void *(*) (long)) xmalloc,
(void (*) (void *)) free);
}
/* Finalize everything in this source file. */
@ -1014,6 +1081,8 @@ _cpp_cleanup_files (cpp_reader *pfile)
{
htab_delete (pfile->file_hash);
htab_delete (pfile->dir_hash);
htab_delete (pfile->nonexistent_file_hash);
obstack_free (&pfile->nonexistent_file_ob, 0);
}
/* Enter a file name in the hash for the sake of cpp_included. */

4
contrib/gcclibs/libcpp/internal.h
View File

@ -355,6 +355,10 @@ struct cpp_reader
struct file_hash_entry *file_hash_entries;
unsigned int file_hash_entries_allocated, file_hash_entries_used;
/* Negative path lookup hash table. */
struct htab *nonexistent_file_hash;
struct obstack nonexistent_file_ob;
/* Nonzero means don't look for #include "foo" the source-file
directory. */
bool quote_ignores_source_dir;

28
contrib/gcclibs/libcpp/lex.c
View File

@ -111,31 +111,39 @@ _cpp_clean_line (cpp_reader *pfile)
if (!buffer->from_stage3)
{
const uchar *pbackslash = NULL;
/* Short circuit for the common case of an un-escaped line with
no trigraphs. The primary win here is by not writing any
data back to memory until we have to. */
for (;;)
{
c = *++s;
if (c == '\n' || c == '\r')
if (__builtin_expect (c == '\n', false)
|| __builtin_expect (c == '\r', false))
{
d = (uchar *) s;
if (s == buffer->rlimit)
if (__builtin_expect (s == buffer->rlimit, false))
goto done;
/* DOS line ending? */
if (c == '\r' && s[1] == '\n')
if (__builtin_expect (c == '\r', false)
&& s[1] == '\n')
{
s++;
if (s == buffer->rlimit)
goto done;
}
/* check for escaped newline */
if (__builtin_expect (pbackslash == NULL, true))
goto done;
/* Check for escaped newline. */
p = d;
while (p != buffer->next_line && is_nvspace (p[-1]))
while (is_nvspace (p[-1]))
p--;
if (p == buffer->next_line || p[-1] != '\\')
if (p - 1 != pbackslash)
goto done;
/* Have an escaped newline; process it and proceed to
@ -145,7 +153,11 @@ _cpp_clean_line (cpp_reader *pfile)
buffer->next_line = p - 1;
break;
}
if (c == '?' && s[1] == '?' && _cpp_trigraph_map[s[2]])
if (__builtin_expect (c == '\\', false))
pbackslash = s;
else if (__builtin_expect (c == '?', false)
&& __builtin_expect (s[1] == '?', false)
&& _cpp_trigraph_map[s[2]])
{
/* Have a trigraph. We may or may not have to convert
it. Add a line note regardless, for -Wtrigraphs. */