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Pavel Chromy: performance tweak of gdb_put_packet_inner() removing malloc and avoiding memcpy of larger blocks of data, 

git-svn-id: svn://svn.berlios.de/openocd/trunk@453 b42882b7-edfa-0310-969c-e2dbd0fdcd60
This commit is contained in:
oharboe 2008-03-06 12:04:27 +00:00
parent 209d7c0edc
commit 652a5b18b4
1 changed files with 32 additions and 36 deletions
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40
src/server/gdb_server.c
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@ -314,31 +314,27 @@ int gdb_put_packet_inner(connection_t *connection, char *buffer, int len)
free(debug_buffer);
#endif
void *allocated = NULL;
char stackAlloc[1024];
char *t = stackAlloc;
int totalLen = 1 + len + 1 + 2;
if (totalLen > sizeof(stackAlloc))
char local_buffer[1024];
local_buffer[0] = '$';
if (len+4 <= sizeof(local_buffer))
{
allocated = malloc(totalLen);
t = allocated;
if (allocated == NULL)
{
ERROR("Ran out of memory trying to reply packet %d\n", totalLen);
exit(-1);
/* performance gain on smaller packets by only a single call to gdb_write() */
memcpy(local_buffer+1, buffer, len++);
local_buffer[len++] = '#';
local_buffer[len++] = DIGITS[(my_checksum >> 4) & 0xf];
local_buffer[len++] = DIGITS[my_checksum & 0xf];
gdb_write(connection, local_buffer, len);
}
}
t[0] = '$';
memcpy(t + 1, buffer, len);
t[1 + len] = '#';
t[1 + len + 1] = DIGITS[(my_checksum >> 4) & 0xf];
t[1 + len + 2] = DIGITS[my_checksum & 0xf];
gdb_write(connection, t, totalLen);
if (allocated)
else
{
free(allocated);
/* larger packets are transmitted directly from caller supplied buffer
by several calls to gdb_write() to avoid dynamic allocation */
local_buffer[1] = '#';
local_buffer[2] = DIGITS[(my_checksum >> 4) & 0xf];
local_buffer[3] = DIGITS[my_checksum & 0xf];
gdb_write(connection, local_buffer, 1);
gdb_write(connection, buffer, len);
gdb_write(connection, local_buffer+1, 3);
}
if ((retval = gdb_get_char(connection, &reply)) != ERROR_OK)