diff options
Diffstat (limited to 'conf/cf-lex.l')
-rw-r--r-- | conf/cf-lex.l | 174 |
1 files changed, 139 insertions, 35 deletions
diff --git a/conf/cf-lex.l b/conf/cf-lex.l index c9d2f5a5..7ce457fe 100644 --- a/conf/cf-lex.l +++ b/conf/cf-lex.l @@ -42,7 +42,7 @@ #define PARSER 1 #include "nest/bird.h" -#include "nest/route.h" +#include "nest/rt.h" #include "nest/protocol.h" #include "filter/filter.h" #include "filter/f-inst.h" @@ -77,19 +77,22 @@ static uint cf_hash(const byte *c); #define SYM_NEXT(n) n->next #define SYM_EQ(a,s1,b,s2) !strcmp(a,b) && s1 == s2 #define SYM_FN(k,s) cf_hash(k) -#define SYM_ORDER 6 /* Initial */ +#define SYM_ORDER 4 /* Initial */ #define SYM_REHASH sym_rehash -#define SYM_PARAMS /8, *1, 2, 2, 6, 20 +#define SYM_PARAMS /8, *1, 2, 2, 4, 20 HASH_DEFINE_REHASH_FN(SYM, struct symbol) HASH(struct keyword) kw_hash; - +HASH(struct ea_class) ea_name_hash; struct sym_scope *conf_this_scope; +static struct sym_scope global_root_scope__init = { .active = 1, }; +struct sym_scope *global_root_scope = &global_root_scope__init; + linpool *cfg_mem; int (*cf_read_hook)(byte *buf, unsigned int max, int fd); @@ -347,7 +350,7 @@ else: { return DDOT; } -[={}:;,.()+*/%<>~\[\]?!\|-] { +[={}:;,.()+*/%<>~\[\]?!\|&-] { return yytext[0]; } @@ -574,6 +577,8 @@ check_eof(void) return 0; } +static inline void cf_swap_soft_scope(void); + static struct symbol * cf_new_symbol(const byte *c) { @@ -583,45 +588,64 @@ cf_new_symbol(const byte *c) if (l > SYM_MAX_LEN) cf_error("Symbol too long"); + cf_swap_soft_scope(); + s = cfg_allocz(sizeof(struct symbol) + l + 1); *s = (struct symbol) { .scope = conf_this_scope, .class = SYM_VOID, }; strcpy(s->name, c); - if (!new_config->sym_hash.data) - HASH_INIT(new_config->sym_hash, new_config->pool, SYM_ORDER); + if (!conf_this_scope->hash.data) + HASH_INIT(conf_this_scope->hash, new_config->pool, SYM_ORDER); + + HASH_INSERT2(conf_this_scope->hash, SYM, new_config->pool, s); + + if (conf_this_scope == new_config->root_scope) + add_tail(&(new_config->symbols), &(s->n)); + + return s; +} + +static struct symbol * +cf_root_symbol(const byte *c) +{ + uint l = strlen(c); + if (l > SYM_MAX_LEN) + bug("Root symbol %s too long", c); - HASH_INSERT2(new_config->sym_hash, SYM, new_config->pool, s); + struct symbol *s = mb_alloc(&root_pool, sizeof(struct symbol) + l + 1); + *s = (struct symbol) { .scope = global_root_scope, .class = SYM_VOID, }; + memcpy(s->name, c, l+1); - add_tail(&(new_config->symbols), &(s->n)); + if (!global_root_scope->hash.data) + HASH_INIT(global_root_scope->hash, &root_pool, SYM_ORDER); + HASH_INSERT2(global_root_scope->hash, SYM, &root_pool, s); return s; } + /** - * cf_find_symbol - find a symbol by name - * @cfg: specificed config + * cf_find_symbol_scope - find a symbol by name + * @scope: config scope * @c: symbol name * - * This functions searches the symbol table in the config @cfg for a symbol of - * given name. First it examines the current scope, then the second recent one + * This functions searches the symbol table in the scope @scope for a symbol of + * given name. First it examines the current scope, then the underlying one * and so on until it either finds the symbol and returns a pointer to its * &symbol structure or reaches the end of the scope chain and returns %NULL to * signify no match. */ struct symbol * -cf_find_symbol(const struct config *cfg, const byte *c) +cf_find_symbol_scope(const struct sym_scope *scope, const byte *c) { struct symbol *s; - if (cfg->sym_hash.data && - (s = HASH_FIND(cfg->sym_hash, SYM, c, 1))) - return s; - - /* In CLI command parsing, fallback points to the current config, otherwise it is NULL. */ - if (cfg->fallback && - cfg->fallback->sym_hash.data && - (s = HASH_FIND(cfg->fallback->sym_hash, SYM, c, 1))) - return s; + /* Find the symbol here or anywhere below */ + while (scope) + if (scope->hash.data && (s = HASH_FIND(scope->hash, SYM, c, 1))) + return s; + else + scope = scope->next; return NULL; } @@ -638,7 +662,7 @@ cf_find_symbol(const struct config *cfg, const byte *c) struct symbol * cf_get_symbol(const byte *c) { - return cf_find_symbol(new_config, c) ?: cf_new_symbol(c); + return cf_find_symbol_scope(conf_this_scope, c) ?: cf_new_symbol(c); } /** @@ -654,10 +678,10 @@ cf_localize_symbol(struct symbol *sym) /* If the symbol type is void, it has been recently allocated just in this scope. */ if (!sym->class) return sym; - + /* If the scope is the current, it is already defined in this scope. */ - if (sym->scope == conf_this_scope) - cf_error("Symbol already defined"); + if (cf_symbol_is_local(sym)) + cf_error("Symbol '%s' already defined", sym->name); /* Not allocated here yet, doing it now. */ return cf_new_symbol(sym->name); @@ -689,10 +713,7 @@ cf_lex_symbol(const char *data) struct symbol *sym = cf_get_symbol(data); cf_lval.s = sym; - if (sym->class != SYM_VOID) - return CF_SYM_KNOWN; - - /* Is it a keyword? */ + /* Is it a keyword? Prefer the keyword. */ struct keyword *k = HASH_FIND(kw_hash, KW, data); if (k) { @@ -705,21 +726,51 @@ cf_lex_symbol(const char *data) } } - /* OK, undefined symbol */ - cf_lval.s = sym; - return CF_SYM_UNDEFINED; + /* OK, only a symbol. */ + if (sym->class == SYM_VOID) + return CF_SYM_UNDEFINED; + else + return CF_SYM_KNOWN; } static void cf_lex_init_kh(void) { - HASH_INIT(kw_hash, &root_pool, KW_ORDER); + HASH_INIT(kw_hash, config_pool, KW_ORDER); struct keyword *k; for (k=keyword_list; k->name; k++) HASH_INSERT(kw_hash, KW, k); } +void +ea_lex_register(struct ea_class *def) +{ + struct symbol *sym = cf_root_symbol(def->name); + sym->class = SYM_ATTRIBUTE; + sym->attribute = def; + def->sym = sym; +} + +void +ea_lex_unregister(struct ea_class *def) +{ + struct symbol *sym = def->sym; + HASH_REMOVE2(global_root_scope->hash, SYM, &root_pool, sym); + mb_free(sym); + def->sym = NULL; +} + +struct ea_class * +ea_class_find_by_name(const char *name) +{ + struct symbol *sym = cf_find_symbol(global_root_scope, name); + if (!sym || (sym->class != SYM_ATTRIBUTE)) + return NULL; + else + return sym->attribute; +} + /** * cf_lex_init - initialize the lexer * @is_cli: true if we're going to parse CLI command, false for configuration @@ -753,6 +804,11 @@ cf_lex_init(int is_cli, struct config *c) c->root_scope = cfg_allocz(sizeof(struct sym_scope)); conf_this_scope = c->root_scope; conf_this_scope->active = 1; + + if (is_cli) + conf_this_scope->next = config->root_scope; + else + conf_this_scope->next = global_root_scope; } /** @@ -787,6 +843,8 @@ cf_push_scope(struct symbol *sym) void cf_pop_scope(void) { + ASSERT(!conf_this_scope->soft_scopes); + conf_this_scope->active = 0; conf_this_scope = conf_this_scope->next; @@ -794,6 +852,52 @@ cf_pop_scope(void) } /** + * cf_push_soft_scope - enter new soft scope + * + * If we want to enter a new anonymous scope that most likely will not contain + * any symbols, we can use cf_push_soft_scope() insteas of cf_push_scope(). + * Such scope will be converted to a regular scope on first use. + */ +void +cf_push_soft_scope(void) +{ + if (conf_this_scope->soft_scopes < 0xfe) + conf_this_scope->soft_scopes++; + else + cf_push_block_scope(); +} + +/** + * cf_pop_soft_scope - leave a soft scope + * + * Leave a soft scope entered by cf_push_soft_scope(). + */ +void +cf_pop_soft_scope(void) +{ + if (conf_this_scope->soft_scopes) + conf_this_scope->soft_scopes--; + else + cf_pop_block_scope(); +} + +/** + * cf_swap_soft_scope - convert soft scope to regular scope + * + * Soft scopes cannot hold symbols, so they must be converted to regular scopes + * on first use. It is done automatically by cf_new_symbol(). + */ +static inline void +cf_swap_soft_scope(void) +{ + if (conf_this_scope->soft_scopes) + { + conf_this_scope->soft_scopes--; + cf_push_block_scope(); + } +} + +/** * cf_symbol_class_name - get name of a symbol class * @sym: symbol * |