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authorMartin Mares <mj@ucw.cz>1999-11-30 15:03:36 +0100
committerMartin Mares <mj@ucw.cz>1999-11-30 15:03:36 +0100
commitc9aae7f47fd7ad71b80cbc86c01a26c504ba08d0 (patch)
treee12cc810a25c7f829c86d69801202d87f6dce9e8
parentf0474f207061151183bb85d59f09422e7bb7e2ee (diff)
downloadbird-c9aae7f47fd7ad71b80cbc86c01a26c504ba08d0.tar
bird-c9aae7f47fd7ad71b80cbc86c01a26c504ba08d0.zip
Lexer supports fallback symbol tables and uses them to recognize
symbols from global config when parsing CLI commands. cf_lex_init_tables() is now called automatically inside the lexer.
-rw-r--r--conf/cf-lex.l59
-rw-r--r--conf/conf.c2
-rw-r--r--conf/conf.h3
3 files changed, 38 insertions, 26 deletions
diff --git a/conf/cf-lex.l b/conf/cf-lex.l
index 5959e70..dadc833 100644
--- a/conf/cf-lex.l
+++ b/conf/cf-lex.l
@@ -29,12 +29,12 @@ static struct keyword {
{ NULL, -1 } };
#define KW_HASH_SIZE 64
+static struct keyword *kw_hash[KW_HASH_SIZE];
+static int kw_hash_inited;
+
#define SYM_HASH_SIZE 128
#define SYM_MAX_LEN 32
-static struct keyword *kw_hash[KW_HASH_SIZE];
-static struct symbol **sym_hash;
-
struct sym_scope {
struct sym_scope *next; /* Next on scope stack */
struct symbol *name; /* Name of this scope */
@@ -192,21 +192,30 @@ static struct symbol *
cf_find_sym(byte *c, unsigned int h0)
{
unsigned int h = h0 & (SYM_HASH_SIZE-1);
- struct symbol *s;
+ struct symbol *s, **ht;
int l;
- if (!sym_hash)
- sym_hash = cfg_allocz(SYM_HASH_SIZE * sizeof(struct keyword *));
- else
- for(s = sym_hash[h]; s; s=s->next)
+ if (ht = new_config->sym_hash)
+ {
+ for(s = ht[h]; s; s=s->next)
+ if (!strcmp(s->name, c) && s->scope->active)
+ return s;
+ }
+ if (new_config->sym_fallback)
+ {
+ /* We know only top-level scope is active */
+ for(s = new_config->sym_fallback[h]; s; s=s->next)
if (!strcmp(s->name, c) && s->scope->active)
return s;
+ }
+ if (!ht)
+ ht = new_config->sym_hash = cfg_allocz(SYM_HASH_SIZE * sizeof(struct keyword *));
l = strlen(c);
if (l > SYM_MAX_LEN)
cf_error("Symbol too long");
s = cfg_alloc(sizeof(struct symbol) + l);
- s->next = sym_hash[h];
- sym_hash[h] = s;
+ s->next = ht[h];
+ ht[h] = s;
s->scope = conf_this_scope;
s->class = SYM_VOID;
s->def = NULL;
@@ -246,10 +255,25 @@ cf_define_symbol(struct symbol *sym, int type, void *def)
sym->def = def;
}
+static void
+cf_lex_init_kh(void)
+{
+ struct keyword *k;
+
+ for(k=keyword_list; k->name; k++)
+ {
+ unsigned h = cf_hash(k->name) & (KW_HASH_SIZE-1);
+ k->next = kw_hash[h];
+ kw_hash[h] = k;
+ }
+ kw_hash_inited = 1;
+}
+
void
cf_lex_init(int is_cli)
{
- sym_hash = NULL;
+ if (!kw_hash_inited)
+ cf_lex_init_kh();
conf_lino = 1;
yyrestart(NULL);
if (is_cli)
@@ -261,19 +285,6 @@ cf_lex_init(int is_cli)
}
void
-cf_lex_init_tables(void)
-{
- struct keyword *k;
-
- for(k=keyword_list; k->name; k++)
- {
- unsigned h = cf_hash(k->name) & (KW_HASH_SIZE-1);
- k->next = kw_hash[h];
- kw_hash[h] = k;
- }
-}
-
-void
cf_push_scope(struct symbol *sym)
{
struct sym_scope *s = cfg_alloc(sizeof(struct sym_scope));
diff --git a/conf/conf.c b/conf/conf.c
index 47d4db4..4e2f920 100644
--- a/conf/conf.c
+++ b/conf/conf.c
@@ -45,7 +45,6 @@ config_parse(struct config *c)
if (setjmp(conf_jmpbuf))
return 0;
cf_lex_init(0);
- cf_lex_init_tables();
protos_preconfig(c);
rt_preconfig(c);
cf_parse();
@@ -62,6 +61,7 @@ int
cli_parse(struct config *c)
{
new_config = c;
+ c->sym_fallback = config->sym_hash;
cfg_mem = c->mem;
if (setjmp(conf_jmpbuf))
return 0;
diff --git a/conf/conf.h b/conf/conf.h
index ec8be40..957ce44 100644
--- a/conf/conf.h
+++ b/conf/conf.h
@@ -23,6 +23,8 @@ struct config {
char *err_msg; /* Parser error message */
int err_lino; /* Line containing error */
char *file_name; /* Name of configuration file */
+ struct symbol **sym_hash; /* Lexer: symbol hash table */
+ struct symbol **sym_fallback; /* Lexer: fallback symbol hash table */
};
extern struct config *config, *new_config;
@@ -69,7 +71,6 @@ struct symbol {
extern int conf_lino;
-void cf_lex_init_tables(void);
int cf_lex(void);
void cf_lex_init(int is_cli);
struct symbol *cf_find_symbol(byte *c);