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Nested scopes could never have worked. My fault I wrote such a buggy code,

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Pavel's fault that he's never tested shadowing of declarations in the filters.

cf_define_symbol() has been modified to check the scope of the symbol it's
given and it if it's an already defined symbol, but in a different scope,
a copy is created in the current scope and redefined to the new meaning,
the consequence being that it cf_define_symbol() now returns the new symbol
you need to use when assigning aux and aux2.
This commit is contained in:
Martin Mares 2000-06-04 19:30:13 +00:00
parent dab6651916
commit 04dc62a011
2 changed files with 40 additions and 21 deletions
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59
conf/cf-lex.l
View file

@ -212,12 +212,34 @@ cf_hash(byte *c)
return h;
}
static struct symbol *
cf_new_sym(byte *c, unsigned int h)
{
struct symbol *s, **ht;
int l;
if (!new_config->sym_hash)
new_config->sym_hash = cfg_allocz(SYM_HASH_SIZE * sizeof(struct keyword *));
ht = new_config->sym_hash;
l = strlen(c);
if (l > SYM_MAX_LEN)
cf_error("Symbol too long");
s = cfg_alloc(sizeof(struct symbol) + l);
s->next = ht[h];
ht[h] = s;
s->scope = conf_this_scope;
s->class = SYM_VOID;
s->def = NULL;
s->aux = 0;
strcpy(s->name, c);
return s;
}
static struct symbol *
cf_find_sym(byte *c, unsigned int h0)
{
unsigned int h = h0 & (SYM_HASH_SIZE-1);
struct symbol *s, **ht;
int l;
if (ht = new_config->sym_hash)
{
@ -232,20 +254,7 @@ cf_find_sym(byte *c, unsigned int h0)
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 = ht[h];
ht[h] = s;
s->scope = conf_this_scope;
s->class = SYM_VOID;
s->def = NULL;
s->aux = 0;
strcpy(s->name, c);
return s;
return cf_new_sym(c, h);
}
/**
@ -291,17 +300,27 @@ cf_default_name(char *template, int *counter)
* @type: symbol class to assign
* @def: class dependent data
*
* This function takes a symbol, checks whether it's really
* an undefined one (else it raises an error) and assigns the
* given class and definition to it.
* Defines new meaning of a symbol. If the symbol is an undefined
* one (%SYM_VOID), it's just re-defined to the new type. If it's defined
* in different scope, a new symbol in current scope is created and the
* meaning is assigned to it. If it's already defined in the current scope,
* an error is reported via cf_error().
*
* Result: Pointer to the newly defined symbol. If we are in the top-level
* scope, it's the same @sym as passed to the function.
*/
void
struct symbol *
cf_define_symbol(struct symbol *sym, int type, void *def)
{
if (sym->class)
cf_error("Symbol already defined");
{
if (sym->scope == conf_this_scope)
cf_error("Symbol already defined");
sym = cf_new_sym(sym->name, cf_hash(sym->name) & (SYM_HASH_SIZE-1));
}
sym->class = type;
sym->def = def;
return sym;
}
static void

2
conf/conf.h
View file

@ -98,7 +98,7 @@ int cf_lex(void);
void cf_lex_init(int is_cli);
struct symbol *cf_find_symbol(byte *c);
struct symbol *cf_default_name(char *template, int *counter);
void cf_define_symbol(struct symbol *symbol, int type, void *def);
struct symbol *cf_define_symbol(struct symbol *symbol, int type, void *def);
void cf_push_scope(struct symbol *);
void cf_pop_scope(void);
struct symbol *cf_walk_symbols(struct config *cf, struct symbol *sym, int *pos);