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[fcxml.c] Embed a static 64-byte attr buffer in FcPStack 

Reduces number of mallocs called from FcConfigSaveAttr in my small test
from 160 down to 6.
This commit is contained in:
Behdad Esfahbod 2009-03-12 12:31:57 -04:00
parent 39861b7d9c
commit de69ee14d3
2 changed files with 17 additions and 10 deletions
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4
src/fcstr.c
View File

@ -716,8 +716,8 @@ FcStrBufInit (FcStrBuf *buf, FcChar8 *init, int size)
buf->size = size;
} else
{
buf->buf = buf->static_buf;
buf->size = sizeof (buf->static_buf);
buf->buf = buf->buf_static;
buf->size = sizeof (buf->buf_static);
}
buf->allocated = FcFalse;
buf->failed = FcFalse;

23
src/fcxml.c
View File

@ -414,6 +414,7 @@ typedef struct _FcPStack {
FcElement element;
FcChar8 **attr;
FcStrBuf str;
FcChar8 *attr_buf_static[16];
} FcPStack;
typedef enum _FcVStackTag {
@ -920,7 +921,7 @@ FcVStackElements (FcConfigParse *parse)
}
static FcChar8 **
FcConfigSaveAttr (const XML_Char **attr)
FcConfigSaveAttr (const XML_Char **attr, FcChar8 **buf, int size_bytes)
{
int slen;
int i;
@ -934,13 +935,19 @@ FcConfigSaveAttr (const XML_Char **attr)
slen += strlen ((char *) attr[i]) + 1;
if (i == 0)
return 0;
new = malloc ((i + 1) * sizeof (FcChar8 *) + slen);
if (!new)
slen += (i + 1) * sizeof (FcChar8 *);
if (slen <= size_bytes)
new = buf;
else
{
FcConfigMessage (0, FcSevereError, "out of memory");
return 0;
new = malloc (slen);
if (!new)
{
FcConfigMessage (0, FcSevereError, "out of memory");
return 0;
}
FcMemAlloc (FC_MEM_ATTR, 1); /* size is too expensive */
}
FcMemAlloc (FC_MEM_ATTR, 1); /* size is too expensive */
s = (FcChar8 *) (new + (i + 1));
for (i = 0; attr[i]; i++)
{
@ -969,7 +976,7 @@ FcPStackPush (FcConfigParse *parse, FcElement element, const XML_Char **attr)
new->prev = parse->pstack;
new->element = element;
new->attr = FcConfigSaveAttr (attr);
new->attr = FcConfigSaveAttr (attr, new->attr_buf_static, sizeof (new->attr_buf_static));
FcStrBufInit (&new->str, 0, 0);
parse->pstack = new;
return FcTrue;
@ -989,7 +996,7 @@ FcPStackPop (FcConfigParse *parse)
old = parse->pstack;
parse->pstack = old->prev;
FcStrBufDestroy (&old->str);
if (old->attr)
if (old->attr && old->attr != old->attr_buf_static)
{
FcMemFree (FC_MEM_ATTR, 1); /* size is to expensive */
free (old->attr);