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Conf: Improve handling of keywords

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For whatever reason, parser allocated a symbol for every parsed keyword
in each scope. That wasted time and memory. The effect is worsened with
recent changes allowing local scopes, so keywords often promote soft
scopes (with no symbols) to real scopes.

Do not allocate a symbol for a keyword. Take care of keywords that could
be promoted to symbols (kw_sym) and do it explicitly.
This commit is contained in:
Ondrej Zajicek 2023-04-27 18:20:49 +02:00
parent 9b471e72d7
commit a8a64ca0fe
6 changed files with 24 additions and 8 deletions
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17
conf/cf-lex.l
View File

@ -601,6 +601,10 @@ cf_new_symbol(const byte *c)
return s; return s;
} }
struct symbol *
cf_symbol_from_keyword(const struct keyword *kw)
{ return cf_new_symbol(kw->name); }
/** /**
* cf_find_local_symbol - find a symbol by name * cf_find_local_symbol - find a symbol by name
* @cfg: specificed config * @cfg: specificed config
@ -692,18 +696,23 @@ static enum yytokentype
cf_lex_symbol(const char *data) cf_lex_symbol(const char *data)
{ {
/* Have we defined such a symbol? */ /* Have we defined such a symbol? */
struct symbol *sym = cf_get_symbol(data); struct symbol *sym = cf_find_local_symbol(new_config, conf_this_scope, data);
cf_lval.s = sym;
if (sym->class != SYM_VOID) if (sym && (sym->class != SYM_VOID))
{
cf_lval.s = sym;
return CF_SYM_KNOWN; return CF_SYM_KNOWN;
}
/* Is it a keyword? */ /* Is it a keyword? */
struct keyword *k = HASH_FIND(kw_hash, KW, data); struct keyword *k = HASH_FIND(kw_hash, KW, data);
if (k) if (k)
{ {
if (k->value > 0) if (k->value > 0)
{
cf_lval.kw = k;
return k->value; return k->value;
}
else else
{ {
cf_lval.i = -k->value; cf_lval.i = -k->value;
@ -712,7 +721,7 @@ cf_lex_symbol(const char *data)
} }
/* OK, undefined symbol */ /* OK, undefined symbol */
cf_lval.s = sym; cf_lval.s = cf_new_symbol(data);
return CF_SYM_UNDEFINED; return CF_SYM_UNDEFINED;
} }

3
conf/conf.h
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@ -191,6 +191,9 @@ struct symbol *cf_find_local_symbol(const struct config *cfg, const struct sym_s
static inline struct symbol *cf_find_symbol(const struct config *cfg, const byte *c) static inline struct symbol *cf_find_symbol(const struct config *cfg, const byte *c)
{ return cf_find_local_symbol(cfg, cfg->root_scope, c); } { return cf_find_local_symbol(cfg, cfg->root_scope, c); }
struct keyword;
struct symbol *cf_symbol_from_keyword(const struct keyword *kw);
struct symbol *cf_get_symbol(const byte *c); struct symbol *cf_get_symbol(const byte *c);
struct symbol *cf_default_name(char *template, int *counter); struct symbol *cf_default_name(char *template, int *counter);
struct symbol *cf_localize_symbol(struct symbol *sym); struct symbol *cf_localize_symbol(struct symbol *sym);

4
conf/confbase.Y
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@ -61,6 +61,7 @@ CF_DECLS
net_addr net; net_addr net;
net_addr *net_ptr; net_addr *net_ptr;
struct symbol *s; struct symbol *s;
struct keyword *kw;
const char *t; const char *t;
struct rtable_config *r; struct rtable_config *r;
struct channel_config *cc; struct channel_config *cc;
@ -117,6 +118,7 @@ CF_DECLS
%type <t> text opttext %type <t> text opttext
%type <s> symbol %type <s> symbol
%type <kw> kw_sym
%nonassoc PREFIX_DUMMY %nonassoc PREFIX_DUMMY
%left AND OR %left AND OR
@ -172,7 +174,7 @@ expr_us:
| expr US { $$ = $1 US_; } | expr US { $$ = $1 US_; }
; ;
symbol: CF_SYM_UNDEFINED | CF_SYM_KNOWN ; symbol: CF_SYM_UNDEFINED | CF_SYM_KNOWN | kw_sym { $$ = cf_symbol_from_keyword($1); } ;
/* Switches */ /* Switches */

4
conf/gen_parser.m4
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@ -29,9 +29,9 @@ m4_define(CF_END, `m4_divert(-1)')
m4_define(CF_itera, `m4_ifelse($#, 1, [[CF_iter($1)]], [[CF_iter($1)[[]]CF_itera(m4_shift($@))]])') m4_define(CF_itera, `m4_ifelse($#, 1, [[CF_iter($1)]], [[CF_iter($1)[[]]CF_itera(m4_shift($@))]])')
m4_define(CF_iterate, `m4_define([[CF_iter]], m4_defn([[$1]]))CF_itera($2)') m4_define(CF_iterate, `m4_define([[CF_iter]], m4_defn([[$1]]))CF_itera($2)')
# Keywords act as untyped %token # Keywords act as %token<kw>
m4_define(CF_keywd, `m4_ifdef([[CF_tok_$1]],,[[m4_define([[CF_tok_$1]],1)m4_define([[CF_toks]],CF_toks $1)]])') m4_define(CF_keywd, `m4_ifdef([[CF_tok_$1]],,[[m4_define([[CF_tok_$1]],1)m4_define([[CF_toks]],CF_toks $1)]])')
m4_define(CF_KEYWORDS, `m4_define([[CF_toks]],[[]])CF_iterate([[CF_keywd]], [[$@]])m4_ifelse(CF_toks,,,%token<s>[[]]CF_toks m4_define(CF_KEYWORDS, `m4_define([[CF_toks]],[[]])CF_iterate([[CF_keywd]], [[$@]])m4_ifelse(CF_toks,,,%token<kw>[[]]CF_toks
)DNL') )DNL')
# CLI commands # CLI commands

2
nest/config.Y
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@ -154,6 +154,8 @@ CF_ENUM_PX(T_ENUM_AF, AF_, AFI_, IPV4, IPV6)
CF_GRAMMAR CF_GRAMMAR
kw_sym: MIN MAX ;
/* Setting of router ID */ /* Setting of router ID */
conf: rtrid ; conf: rtrid ;

2
proto/bgp/config.Y
View File

@ -46,7 +46,7 @@ CF_KEYWORDS(CEASE, PREFIX, LIMIT, HIT, ADMINISTRATIVE, SHUTDOWN, RESET, PEER,
CF_GRAMMAR CF_GRAMMAR
/* Workaround for collisions between keywords and symbols */ /* Workaround for collisions between keywords and symbols */
symbol: ROLE | PEER | PROVIDER | CUSTOMER | RS_SERVER | RS_CLIENT ; kw_sym: ROLE | PEER | PROVIDER | CUSTOMER | RS_SERVER | RS_CLIENT ;
proto: bgp_proto '}' ; proto: bgp_proto '}' ;