Commit Graph

16 Commits

Author SHA1 Message Date
Glenn Strauss f7018e3d39 [core] sock_addr_set_port() 2021-09-08 15:06:07 -04:00
Glenn Strauss af3df29ae8 [multiple] reduce redundant NULL buffer checks
This commit is a large set of code changes and results in removal of
hundreds, perhaps thousands, of CPU instructions, a portion of which
are on hot code paths.

Most (buffer *) used by lighttpd are not NULL, especially since buffers
were inlined into numerous larger structs such as request_st and chunk.

In the small number of instances where that is not the case, a NULL
check is often performed earlier in a function where that buffer is
later used with a buffer_* func.  In the handful of cases that remained,
a NULL check was added, e.g. with r->http_host and r->conf.server_tag.

- check for empty strings at config time and set value to NULL if blank
  string will be ignored at runtime; at runtime, simple pointer check
  for NULL can be used to check for a value that has been set and is not
  blank ("")
- use buffer_is_blank() instead of buffer_string_is_empty(),
  and use buffer_is_unset() instead of buffer_is_empty(),
  where buffer is known not to be NULL so that NULL check can be skipped
- use buffer_clen() instead of buffer_string_length() when buffer is
  known not to be NULL (to avoid NULL check at runtime)
- use buffer_truncate() instead of buffer_string_set_length() to
  truncate string, and use buffer_extend() to extend

Examples where buffer known not to be NULL:
  - cpv->v.b from config_plugin_values_init is not NULL if T_CONFIG_BOOL
    (though we might set it to NULL if buffer_is_blank(cpv->v.b))
  - address of buffer is arg (&foo)
    (compiler optimizer detects this in most, but not all, cases)
  - buffer is checked for NULL earlier in func
  - buffer is accessed in same scope without a NULL check (e.g. b->ptr)

internal behavior change:
  callers must not pass a NULL buffer to some funcs.
  - buffer_init_buffer() requires non-null args
  - buffer_copy_buffer() requires non-null args
  - buffer_append_string_buffer() requires non-null args
  - buffer_string_space() requires non-null arg
2021-08-27 02:16:53 -04:00
Glenn Strauss db853f9c05 [core] sock_addr_from_buffer_hints_numeric unused
comment out sock_addr_from_buffer_hints_numeric(); currently unused
2021-08-27 02:16:53 -04:00
Glenn Strauss dc01487ea6 [multiple] use buffer_append_* aggregates
reduces the number of round-trips into some frequently-called routines
2021-04-02 01:16:40 -04:00
Glenn Strauss 89a3987ce7 [core] prefer IPv6+IPv4 func vs IPv4-specific func 2020-12-23 03:50:13 -05:00
Glenn Strauss 76faed9145 [multiple] replace fall through comment with attr
replace /* fall through */ comment with __attribute_fallthrough__ macro

Note: not adding attribute to code with external origins:
  xxhash.h (algo_xxhash.h)
so to avoid warnings, may need to compile with -Wno-implicit-fallthrough
2020-12-16 05:16:25 -05:00
Glenn Strauss c18f442a63 [multiple] add summaries to top of some modules 2020-07-08 22:51:31 -04:00
Glenn Strauss 9914bb297b [core] C99 restrict on some base funcs
buffer.[ch], chunk.[ch], request.[ch], sock_addr.[ch]
2020-07-08 19:54:29 -04:00
Glenn Strauss 2c18090216 [core] remove include base.h where unused 2020-07-08 19:54:29 -04:00
Glenn Strauss 0ff60d8218 [multiple] rename r to rc rv rd wr to be different
variable rename
2020-07-08 19:54:28 -04:00
Glenn Strauss 010c28949c [multiple] prefer (connection *) to (srv *)
convert all log_error_write() to log_error() and pass (log_error_st *)

use con->errh in preference to srv->errh (even though currently same)

avoid passing (server *) when previously used only for logging (errh)
2020-07-08 19:54:28 -04:00
Glenn Strauss 851728c6a1 [core] avoid freeaddrinfo() on NULL ptr (fixes #2984)
getaddrinfo() should return non-empty result list (res)
or else should return EAI_NONAME or some other error

(musl C library does not check for NULL argument to freeaddrinfo())

  "Segmentation fault in mod_extforward with libmusl"
2020-01-26 00:14:28 -05:00
Glenn Strauss 186ce8a2b1 [core] allocate unix socket paths with SUN_LEN()+1 (fixes #2962)
(thx lighthouse2)

  "SUN_LEN in sock_addr.c (1.4.53, 1.4.54)"
2019-06-25 00:39:24 -04:00
Glenn Strauss 0257c822c0 [core] quiet coverity false positive 2018-09-25 20:40:36 -04:00
Glenn Strauss da6b2dc1b6 [core] quiet coverity false positive 2017-11-03 23:51:37 -04:00
Glenn Strauss 1367f60626 [core] isolate sock_addr manipulation 2017-10-29 01:23:19 -04:00