* configure: Support a gen-gc configuration variable which

causes CONFIG_GEN_GC to be defined as 1 in config.h.

* eval.c (op_defvar, dwim_loc, op_modplace, transform_op): Handle
mutating assignments via set macro.
(op_dohash): Inform gc about mutated variables. TODO here.

* filter.c (trie_add, trie_compress): Handle mutating assignments
via set macro.

* gc.c (BACKPTR_VEC_SIZE, FULL_GC_INTERVAL): New preprocessor symbols.
(backptr, backptr_idx, partial_gc_count, full): New static variables.
(make_obj): Initialize generation to zero.
(gc): Added logic for deciding between full and partial gc.
(gc_set, gc_mutated): New functions.

* gc.h (gc_set, gc_mutated): Declared.

* hash.c (hash_mark): Changed useless use of vecref_l to vecref.
(gethash_f): Use set when assigning through *found since it
is a possible mutation.

* lib.c (car_l, cdr_l, vecref_l): Got rid of loc macro uses. Using the
value properly is going to be the caller's responsibility.
(push): push may be a mutation, so use set.
(intern): Uset set to mutate a hash entry.
(acons_new_l, aconsq_new_l): Use set when replacing *list.

* lib.h (PTR_BIT): New preprocessor symbol.
(obj_common): New macro for defining common object fields.
type_t is split into two bitfields, half a pointer wide,
allowing for generation to be represented.
(struct any, struct cons, struct string, struct sym, struct package,
struct func, struct vec, struct lazy_cons, struct cobj, struct env,
struct bignum, struct flonum): Use obj_common macro to defined
common fields.
(loc): Macro removed.
(set, mut): Macros conditionally defined for real functionality.
(list_collect, list_collect_nconc, list_collect_append): Replace
mutating operations with set.

* match.c (dest_set, v_cat, v_output, v_filter): Replace
mutating operations with set.

* stream.c (string_in_get_line, string_in_get_char,
strlist_out_put_string, strlist_out_put_char): Replace mutating
operations with set.

* unwind.c (uw_register_subtype): Replace mutating operation with set.

1 files changed, 8 insertions, 0 deletions

diff --git a/gc.h b/gc.h
index 0ca2b20a..f82bfd15 100644
--- a/gc.h
+++ b/gc.h
@@ -23,6 +23,7 @@
  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  */
+
 void gc_init(val *stack_bottom);
 val prot1(val *loc);
 void rel1(val *loc);
@@ -33,8 +34,15 @@ void gc(void);
 int gc_state(int);
 void gc_mark(val);
 int gc_is_reachable(val);
+
+#if CONFIG_GEN_GC
+val gc_set(val *, val);
+void gc_mutated(val);
+#endif
+
 void unmark(void);
 void gc_hint_func(val *);
+
 #define gc_hint(var) gc_hint_func(&var)
 #define REACHABLE 0x100
 #define FREE      0x200