/*
* FML interpreter. Europagate, 1995
*
- * fmlsym.c,v
+ * $Log: fmlsym.c,v $
+ * Revision 1.4 1995/03/02 08:06:09 adam
+ * Fml function strsub implemented. New test files marc[45].fml.
+ * New test options in fmltest.
+ *
+ * Revision 1.3 1995/02/23 08:32:06 adam
+ * Changed header.
+ *
* Revision 1.1.1.1 1995/02/06 13:48:10 adam
* First version of the FML interpreter. It's slow and memory isn't
* freed properly. In particular, the FML nodes aren't released yet.
#include "fmlp.h"
+#define SYM_CHUNK 128
+
struct fml_sym {
struct fml_sym_info info;
struct fml_sym *next;
int level;
char *name;
+ struct fml_sym *level_link;
};
struct fml_sym_tab {
int level;
int hash;
struct fml_sym **array;
+ struct fml_sym *level_link_0;
+ struct fml_sym *level_link_n;
+ struct fml_sym *free_list;
};
+static struct fml_sym *sym_alloc (struct fml_sym_tab *tab)
+{
+ struct fml_sym *p = tab->free_list;
+ if (!p)
+ {
+ int i;
+
+ tab->free_list = p = malloc (sizeof(*p) * SYM_CHUNK);
+ assert (p);
+ for (i = 0; i<SYM_CHUNK-1; i++)
+ p[i].next = p+i+1;
+ p[i].next = NULL;
+ }
+ tab->free_list = p->next;
+ return p;
+}
+
+static void sym_release (struct fml_sym_tab *tab, struct fml_sym *p)
+{
+ p->next = tab->free_list;
+ tab->free_list = p;
+}
+
struct fml_sym_tab *fml_sym_open (void)
{
struct fml_sym_tab *tab;
if (!tab)
return NULL;
tab->level = 1;
- tab->hash = 101;
+ tab->level_link_0 = NULL;
+ tab->level_link_n = NULL;
+ tab->free_list = NULL;
+ tab->hash = 41;
tab->array = malloc (sizeof(*tab->array) * tab->hash);
if (!tab->array)
{
(*ph)(&fs->info);
*fsp = (*fsp)->next;
free (fs->name);
- free (fs);
+ sym_release (tab, fs);
}
else
fsp = &(*fsp)->next;
return NULL;
strcpy (cp, s);
- sym = malloc (sizeof (*sym));
- if (!sym)
- {
- free (cp);
- return NULL;
- }
+ sym = sym_alloc (tab);
+
sym_entry = tab->array + fml_sym_hash (s, tab->hash);
sym->name = cp;
sym->next = *sym_entry;
*sym_entry = sym;
sym->level = level;
+ if (level)
+ {
+ sym->level_link = tab->level_link_n;
+ tab->level_link_n = sym;
+ }
+ else
+ {
+ sym->level_link = tab->level_link_0;
+ tab->level_link_0 = sym;
+ }
return &sym->info;
}