Introducing structs.

* args.c (args_cat_zap): New function.

* args.h: (args_cat_zap): Declared.

* eval.c (struct_lit_s): New symbol variable.
(eval_init): Initialize struct_lit_s.

* eval.h (struct_lit_s): Declared.

* gc.c (finalize): If a symbol has a struct slot
hash attached to it, we must free it when
the symbol is reclaimed.

* lib.c (make_sym): Initialize symbol's slot_cache pointer
to null.
(copy): Copy structure objects.
(init): Call struct_init to initialize struct module.

* lib.h (SLOT_CACHE_SIZE): New preprocessor symbol
(slot_cache_line_t, slot_cache_t): New typedefs.
(struct sym): New member, slot_cache.

* lisplib.c (struct_set_entries, struct_instantiate):  New
static functions.
(liplib_init): Register new functions in dl_table.

parser.y (HASH_S): New terminal symbol.
(struct): New grammar rule.
(n_expr): Derive struct.
(yybadtoken): Map HASH_S to #S string.

parser.l (grammar): Recognize #S and return HASH_S token.

share/txr/stdlib/place.tl (slot): New defplace.

share/txr/stdlib/struct.tl: New file.

struct.c: New file.

struct.h: New file.

* Makefile (OBJS): Adding struct.o.

1 files changed, 24 insertions, 0 deletions

diff --git a/lisplib.c b/lisplib.c
index 8a98a23e..0e70d7b4 100644
--- a/lisplib.c
+++ b/lisplib.c
@@ -166,6 +166,29 @@ static val path_test_instantiate(val set_fun)
   return nil;
 }
 
+static val struct_set_entries(val dlt, val fun)
+{
+  val name[] = {
+    lit("defstruct"), lit("qref"), lit("new"), nil
+  };
+
+  set_dlt_entries(dlt, name, fun);
+
+  if (fun)
+    sethash(dlt, struct_lit_s, fun);
+  else
+    remhash(dlt, struct_lit_s);
+
+  return nil;
+}
+
+static val struct_instantiate(val set_fun)
+{
+  funcall1(set_fun, nil);
+  load(format(nil, lit("~a/struct.tl"), stdlib_path, nao));
+  return nil;
+}
+
 val dlt_register(val dlt,
                  val (*instantiate)(val),
                  val (*set_entries)(val, val))
@@ -183,6 +206,7 @@ void lisplib_init(void)
   dlt_register(dl_table, txr_case_instantiate, txr_case_set_entries);
   dlt_register(dl_table, with_resources_instantiate, with_resources_set_entries);
   dlt_register(dl_table, path_test_instantiate, path_test_set_entries);
+  dlt_register(dl_table, struct_instantiate, struct_set_entries);
 }
 
 val lisplib_try_load(val sym)