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Some optimizations, use a lookup table for character classes, pre-allocate

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2007-03-15  Matthias Clasen  <mclasen@redhat.com>

        * glib/gscanner.[hc]: Some optimizations, use a lookup
        table for character classes, pre-allocate GStrings with
        reasonable sizes.  (#415323, Charlie Brej)



svn path=/trunk/; revision=5405
This commit is contained in:
Matthias Clasen 2007-03-15 04:54:03 +00:00 committed by Matthias Clasen
parent b2eed3f16c
commit 57c2e6f751
3 changed files with 54 additions and 18 deletions
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6
ChangeLog
View File

@ -1,3 +1,9 @@
2007-03-15 Matthias Clasen <mclasen@redhat.com>
* glib/gscanner.[hc]: Some optimizations, use a lookup
table for character classes, pre-allocate GStrings with
reasonable sizes. (#415323, Charlie Brej)
2007-03-14 Matthias Clasen <mclasen@redhat.com>
* glib/gkeyfile.c (g_key_file_get_double): Fix a

64
glib/gscanner.c
View File

@ -61,6 +61,9 @@
)
#define READ_BUFFER_SIZE (4000)
#define CSET_SKIP_FLAG (1<<0)
#define CSET_IDENT_FIRST_FLAG (1<<1)
#define CSET_IDENT_NTH_FLAG (1<<2)
/* --- typedefs --- */
typedef struct _GScannerKey GScannerKey;
@ -168,6 +171,24 @@ g_scanner_char_2_num (guchar c,
return -1;
}
static void
g_scanner_cset_2_table (guint* table, guchar* cset, guint flag)
{
while (*cset)
{
table[*cset] |= flag;
cset++;
}
return;
}
static inline guint
g_scanner_cset_table_lookup (guint* table, guint c, guint mask)
{
if (c>=256) return 0;
return (table[c] & mask);
}
GScanner*
g_scanner_new (const GScannerConfig *config_templ)
{
@ -234,6 +255,12 @@ g_scanner_new (const GScannerConfig *config_templ)
scanner->msg_handler = g_scanner_msg_handler;
scanner->cset_table = g_new0(guint, 256);
g_scanner_cset_2_table (scanner->cset_table, (guchar*) scanner->config->cset_skip_characters, CSET_SKIP_FLAG);
g_scanner_cset_2_table (scanner->cset_table, (guchar*) scanner->config->cset_identifier_first, CSET_IDENT_FIRST_FLAG);
g_scanner_cset_2_table (scanner->cset_table, (guchar*) scanner->config->cset_identifier_nth, CSET_IDENT_NTH_FLAG);
return scanner;
}
@ -282,6 +309,7 @@ g_scanner_destroy (GScanner *scanner)
g_scanner_free_value (&scanner->next_token, &scanner->next_value);
g_free (scanner->config);
g_free (scanner->buffer);
g_free (scanner->cset_table);
g_free (scanner);
}
@ -865,8 +893,8 @@ g_scanner_unexp_token (GScanner *scanner,
if (scanner->token >= 1 && scanner->token <= 255)
{
if ((scanner->token >= ' ' && scanner->token <= '~') ||
strchr (scanner->config->cset_identifier_first, scanner->token) ||
strchr (scanner->config->cset_identifier_nth, scanner->token))
g_scanner_cset_table_lookup (scanner->cset_table, scanner->token,
CSET_IDENT_FIRST_FLAG | CSET_IDENT_NTH_FLAG))
_g_snprintf (token_string, token_string_len, "character `%c'", scanner->token);
else
_g_snprintf (token_string, token_string_len, "character `\\%o'", scanner->token);
@ -1010,8 +1038,8 @@ g_scanner_unexp_token (GScanner *scanner,
if (expected_token >= 1 && expected_token <= 255)
{
if ((expected_token >= ' ' && expected_token <= '~') ||
strchr (scanner->config->cset_identifier_first, expected_token) ||
strchr (scanner->config->cset_identifier_nth, expected_token))
g_scanner_cset_table_lookup (scanner->cset_table, scanner->token,
CSET_IDENT_FIRST_FLAG | CSET_IDENT_NTH_FLAG))
_g_snprintf (expected_string, expected_string_len, "character `%c'", expected_token);
else
_g_snprintf (expected_string, expected_string_len, "character `\\%o'", expected_token);
@ -1160,9 +1188,9 @@ g_scanner_get_token_i (GScanner *scanner,
g_scanner_get_token_ll (scanner, token_p, value_p, line_p, position_p);
}
while (((*token_p > 0 && *token_p < 256) &&
strchr (scanner->config->cset_skip_characters, *token_p)) ||
g_scanner_cset_table_lookup (scanner->cset_table, *token_p, CSET_SKIP_FLAG)) ||
(*token_p == G_TOKEN_CHAR &&
strchr (scanner->config->cset_skip_characters, value_p->v_char)) ||
g_scanner_cset_table_lookup (scanner->cset_table, value_p->v_char, CSET_SKIP_FLAG)) ||
(*token_p == G_TOKEN_COMMENT_MULTI &&
scanner->config->skip_comment_multi) ||
(*token_p == G_TOKEN_COMMENT_SINGLE &&
@ -1258,7 +1286,7 @@ g_scanner_get_token_ll (GScanner *scanner,
* might interfere with other key chars like slashes or numbers
*/
if (config->scan_identifier &&
ch && strchr (config->cset_identifier_first, ch))
ch && g_scanner_cset_table_lookup (scanner->cset_table, ch, CSET_IDENT_FIRST_FLAG))
goto identifier_precedence;
switch (ch)
@ -1276,7 +1304,7 @@ g_scanner_get_token_ll (GScanner *scanner,
g_scanner_get_char (scanner, line_p, position_p);
token = G_TOKEN_COMMENT_MULTI;
in_comment_multi = TRUE;
gstring = g_string_new (NULL);
gstring = g_string_sized_new (128);
while ((ch = g_scanner_get_char (scanner, line_p, position_p)) != 0)
{
if (ch == '*' && g_scanner_peek_next_char (scanner) == '/')
@ -1296,7 +1324,7 @@ g_scanner_get_token_ll (GScanner *scanner,
goto default_case;
token = G_TOKEN_STRING;
in_string_sq = TRUE;
gstring = g_string_new (NULL);
gstring = g_string_sized_new (32);
while ((ch = g_scanner_get_char (scanner, line_p, position_p)) != 0)
{
if (ch == '\'')
@ -1315,7 +1343,7 @@ g_scanner_get_token_ll (GScanner *scanner,
goto default_case;
token = G_TOKEN_STRING;
in_string_dq = TRUE;
gstring = g_string_new (NULL);
gstring = g_string_sized_new (32);
while ((ch = g_scanner_get_char (scanner, line_p, position_p)) != 0)
{
if (ch == '"')
@ -1477,7 +1505,9 @@ g_scanner_get_token_ll (GScanner *scanner,
if (token == G_TOKEN_NONE)
token = G_TOKEN_INT;
gstring = g_string_new (dotted_float ? "0." : "");
gstring = g_string_sized_new (16);
if (dotted_float)
gstring = g_string_append (gstring, "0.");
gstring = g_string_append_c (gstring, ch);
do /* while (in_number) */
@ -1621,7 +1651,7 @@ g_scanner_get_token_ll (GScanner *scanner,
{
token = G_TOKEN_COMMENT_SINGLE;
in_comment_single = TRUE;
gstring = g_string_new (NULL);
gstring = g_string_sized_new (128);
ch = g_scanner_get_char (scanner, line_p, position_p);
while (ch != 0)
{
@ -1641,16 +1671,16 @@ g_scanner_get_token_ll (GScanner *scanner,
in_comment_single = FALSE;
}
else if (config->scan_identifier && ch &&
strchr (config->cset_identifier_first, ch))
g_scanner_cset_table_lookup (scanner->cset_table, ch, CSET_IDENT_FIRST_FLAG))
{
identifier_precedence:
if (config->cset_identifier_nth && ch &&
strchr (config->cset_identifier_nth,
g_scanner_peek_next_char (scanner)))
g_scanner_cset_table_lookup (scanner->cset_table,
g_scanner_peek_next_char (scanner), CSET_IDENT_NTH_FLAG))
{
token = G_TOKEN_IDENTIFIER;
gstring = g_string_new (NULL);
gstring = g_string_sized_new (32);
gstring = g_string_append_c (gstring, ch);
do
{
@ -1658,7 +1688,7 @@ g_scanner_get_token_ll (GScanner *scanner,
gstring = g_string_append_c (gstring, ch);
ch = g_scanner_peek_next_char (scanner);
}
while (ch && strchr (config->cset_identifier_nth, ch));
while (ch && g_scanner_cset_table_lookup (scanner->cset_table, ch, CSET_IDENT_FIRST_FLAG));
ch = 0;
}
else if (config->scan_identifier_1char)

2
glib/gscanner.h
View File

@ -197,7 +197,7 @@ struct _GScanner
const gchar *text_end;
gchar *buffer;
guint scope_id;
guint *cset_table;
/* handler function for _warn and _error */
GScannerMsgFunc msg_handler;
};