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string: Optimize g_string_append(_len)

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Add static inline versions of these functions
that boil down to just an memcpy. ag_string_append_len
is used quite a bit in GMarkup and GTK's css parser.
This commit is contained in:
Matthias Clasen 2023-01-13 22:21:01 -05:00
parent 0cc74d5a37
commit 9810803358
2 changed files with 38 additions and 8 deletions
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7
glib/gstring.c
View File

@ -539,7 +539,7 @@ g_string_append_uri_escaped (GString *string,
* Returns: (transfer none): @string
*/
GString *
g_string_append (GString *string,
(g_string_append) (GString *string,
const gchar *val)
{
return g_string_insert_len (string, -1, val, -1);
@ -564,7 +564,7 @@ g_string_append (GString *string,
* Returns: (transfer none): @string
*/
GString *
g_string_append_len (GString *string,
(g_string_append_len) (GString *string,
const gchar *val,
gssize len)
{
@ -581,9 +581,8 @@ g_string_append_len (GString *string,
*
* Returns: (transfer none): @string
*/
#undef g_string_append_c
GString *
g_string_append_c (GString *string,
(g_string_append_c) (GString *string,
gchar c)
{
g_return_val_if_fail (string != NULL, NULL);

31
glib/gstring.h
View File

@ -35,6 +35,7 @@
#include <glib/gunicode.h>
#include <glib/gbytes.h>
#include <glib/gutils.h> /* for G_CAN_INLINE */
#include <string.h>
G_BEGIN_DECLS
@ -178,6 +179,36 @@ g_string_append_c_inline (GString *gstring,
return gstring;
}
#define g_string_append_c(gstr,c) g_string_append_c_inline (gstr, c)
static inline GString *
g_string_append_len_inline (GString *gstring,
const char *val,
gssize len)
{
if (len < 0)
len = strlen (val);
if (G_LIKELY (gstring->len + len < gstring->allocated_len))
{
char *end = gstring->str + gstring->len;
if (G_LIKELY (val + len <= end || val > end + len))
memcpy (end, val, len);
else
memmove (end, val, len);
gstring->len += len;
gstring->str[gstring->len] = 0;
return gstring;
}
else
return g_string_insert_len (gstring, -1, val, len);
}
#define g_string_append_len(gstr,val,len) g_string_append_len_inline (gstr, val, len)
#if G_GNUC_CHECK_VERSION (2, 0)
#define g_string_append(gstr,val) g_string_append_len (gstr, val, __builtin_constant_p (val) ? (gssize) strlen (val) : (gssize) -1)
#endif
#endif /* G_CAN_INLINE */