* reimplemented guardians (which now, incidentally, work).

bin/ikarus-collect.c

@@ -319,10 +319,10 @@ static ikp add_object_proc(gc_t* gc, ikp x);
 
 static void collect_stack(gc_t*, ikp top, ikp base);
 static void collect_loop(gc_t*);
-static void guardians_loop(gc_t*);
+static void forward_guardians(gc_t*);
 static void fix_weak_pointers(gc_t*);
 static void gc_add_tconcs(gc_t*);
-static void gc_add_guardians(gc_t*);
+static void empty_dropped_guardians(gc_t*);
 
 /* ik_collect is called from scheme under the following conditions:
  * 1. An attempt is made to allocate a small object and the ap is above
@@ -420,7 +420,16 @@ ik_collect(int mem_req, ikpcb* pcb){
   
   /* next we trace all guardian/guarded objects,
      the procedure does a collect_loop at the end */
-  guardians_loop(&gc);
+#ifndef NDEBUG
+  fprintf(stderr, "forwarding guardians ...\n");
+#endif
+  forward_guardians(&gc);
+#ifndef NDEBUG
+  fprintf(stderr, "done\n");
+#endif
+  collect_loop(&gc);
+
+  //guardians_loop_old(&gc);
 
   /* does not allocate, only bwp's dead pointers */
   fix_weak_pointers(&gc); 
@@ -429,8 +438,16 @@ ik_collect(int mem_req, ikpcb* pcb){
 
   fix_new_pages(&gc);
   pcb->allocation_pointer = pcb->heap_base;
+  /* does not allocate */
   gc_add_tconcs(&gc);
-  gc_add_guardians(&gc);
+  /* does not allocate */
+#ifndef NDEBUG
+  fprintf(stderr, "emptying guardians ...\n");
+#endif
+  empty_dropped_guardians(&gc);
+#ifndef NDEBUG
+  fprintf(stderr, "done\n");
+#endif
   pcb->weak_pairs_ap = 0;
   pcb->weak_pairs_ep = 0;
 
@@ -588,9 +605,155 @@ next_gen(int i){
   return ((i == generation_count) ? generation_count : (i+1));
 }
 
+static void 
+forward_guardians(gc_t* gc){
+  ikpcb* pcb = gc->pcb;
+  int gen;
+  for(gen = gc->collect_gen; gen>=0; gen--){
+    /* must move backwards from older to younger generations */
+    ikp todo = pcb->guardians[gen];
+    pcb->guardians[gen] = null_object;
+    ikp forward = pcb->guardians[next_gen(gen)];
+    ikp dropped = null_object;
+    while(todo != null_object){
+      ikp next = ref(todo, off_cdr);
+      ikp a = ref(todo, off_car);
+      /* ikp tc = ref(a, off_car); */
+      ikp obj = ref(a, off_cdr);
+      if(is_live(obj, gc)){
+        ref(todo, off_cdr) = forward;
+        forward = todo;
+      } else {
+        ref(todo, off_cdr) = dropped;
+        dropped = todo;
+      }
+      todo = next;
+    }
+    pcb->guardians[next_gen(gen)] = forward;
+    pcb->guardians_dropped[gen] = dropped;
+  }
+  for(gen = next_gen(gc->collect_gen); gen>=0; gen--){
+    pcb->guardians[gen] = add_object(gc, pcb->guardians[gen], "guardians");
+  }
+  for(gen = gc->collect_gen; gen>=0; gen--){
+    pcb->guardians_dropped[gen] = 
+      add_object(gc, pcb->guardians_dropped[gen], "guardians dropped");
+  }
 
+}
+
+static void 
+empty_dropped_guardians(gc_t* gc){
+  ikpcb* pcb = gc->pcb;
+  int gen;
+  for(gen = gc->collect_gen; gen>=0; gen--){
+    ikp ls = pcb->guardians_dropped[gen];
+    while(ls != null_object){
+      ikp next = ref(ls, off_cdr);
+      ikp a = ref(ls, off_car);
+      ikp tc = ref(a, off_car);
+      ikp obj = ref(a, off_cdr);
+      assert(tagof(tc) == pair_tag);
+      ikp d = ref(tc, off_cdr);
+      assert(tagof(d) == pair_tag);
+      ref(d, off_car) = obj;
+      ref(d, off_cdr) = a;
+      ref(a, off_car) = false_object;
+      ref(a, off_cdr) = false_object;
+      ref(tc, off_cdr) = a;
+      pcb->dirty_vector[page_index(tc)] = -1;
+      pcb->dirty_vector[page_index(d)] = -1;
+      ls = next;
+    }
+    pcb->guardians_dropped[gen] = null_object;
+  }
+}
+
+ 
+ 
+
+
+
+#if 0
+static void 
+forward_guardians(gc_t* gc){
+  ik_guardian_table* dropped_lists[generation_count];
+  ik_guardian_table* forward_lists[generation_count];
+  int collect_gen = gc->collect_gen;
+  ikpcb* pcb = gc->pcb;
+  /* split collected tc/obj pairs into ones to forward to next 
+     generation (live objs) and ones to drop (dead objects) */
+  int gen;
+  for(gen=0; gen<=collect_gen; gen++){
+    ik_guardian_table* todo = pcb->guardians[gen];
+    pcb->guardians[gen] = 0;
+    ik_guardian_table* forward_list = 0;
+    ik_guardian_table* dropped_list = 0;
+    while(todo){
+      int n = todo->count;
+      int i;
+      for(i=0; i<n; i++){
+        ikp tc = todo->p[i].tc;
+        ikp obj = todo->p[i].obj;
+        if(is_live(obj, gc)){
+          forward_list = move_guardian(tc, obj, forward_list);
+        } else {
+          dropped_list = move_guardian(tc, obj, forward_list);
+        }
+      }
+      ik_guardian_table* next = todo->next;
+      ik_munmap(todo, sizeof(ik_guardian_table));
+      todo = next;
+    }
+    forward_lists[gen] = forward_list;
+    dropped_lists[gen] = dropped_list;
+  }
+  /* next, everything in the forward_lists is forwarded to
+     the guardians list of the next generation.
+    FIXME: if tconc is dead, why are we forwarding it?
+   */
+  for(gen=0; gen<=collect_gen; gen++){
+    ik_guardian_table* src = forward_lists[gen];
+    ik_guardian_table* dst = pcb->guardians[next_gen(gen)];
+    while(src){
+      int n = src->count;
+      int i;
+      for(i=0; i<n; i++){
+        ikp tc = add_object(gc, src->p[i].tc, "guardian tc");
+        ikp obj = add_object(gc, src->p[i].obj, "guardian obj");
+        dst = move_guardian(tc, obj, dst);
+      }
+      ik_guardian_table* next = src->next;
+      ik_munmap(src, sizeof(ik_guardian_table));
+      src = next;
+    }
+  }
+  /* next, everything in the dropped_lists is forwarded to the
+     next generation (e.g. marked live).
+    FIXME: if tconc is dead, why are we forwarding it?
+   */
+  for(gen=0; gen<=collect_gen; gen++){
+    ik_guardian_table* src = dropped_lists[gen];
+    while(src){
+      int n = src->count;
+      int i;
+      for(i=0; i<n; i++){
+        src->p[i].tc = add_object(gc, src->p[i].tc, "guardian tc");
+        src->p[i].obj = add_object(gc, src->p[i].obj, "guardian obj");
+      }
+      src = src->next;
+    }
+  }
+   
+
+}
+#endif
+
+
+
+#if 0
 static void  
-guardians_loop(gc_t* gc){
+guardians_loop_old(gc_t* gc){
   ikpcb* pcb = gc->pcb;
   int gen = gc->collect_gen;
   ik_guardian_table* pending_hold[generation_count]; 
@@ -712,7 +875,7 @@ guardians_loop(gc_t* gc){
     }
   }
 }  
-
+#endif
 
 
 
@@ -1900,31 +2063,4 @@ gc_add_tconcs(gc_t* gc){
   }
 }
 
-static void
-gc_add_guardians(gc_t* gc){
-  ik_guardian_table* t = gc->final_guardians;
-  ikpcb* pcb = gc->pcb;
-  while(t){
-    int i;
-    int count = t->count;
-    for(i=0; i<count; i++){
-      ikp tc = t->p[i].tc;
-      ikp obj = t->p[i].obj;
-      assert(tagof(tc) == pair_tag);
-      ikp d = ref(tc, off_cdr);
-      assert(tagof(d) == pair_tag);
-      ikp new_pair = ik_alloc(pcb, pair_size) + pair_tag;
-      ref(d, off_car) = obj;
-      ref(d, off_cdr) = new_pair;
-      ref(new_pair, off_car) = false_object;
-      ref(new_pair, off_cdr) = false_object;
-      ref(tc, off_cdr) = new_pair;
-      pcb->dirty_vector[page_index(tc)] = -1;
-      pcb->dirty_vector[page_index(d)] = -1;
-    }
-    ik_guardian_table* next = t->next;
-    ik_munmap(t, sizeof(ik_guardian_table));
-    t = next;
-  }
-  gc->final_guardians = 0;
-}
+

bin/ikarus-runtime.c

@@ -264,6 +264,14 @@ ikpcb* ik_make_pcb(){
   ikpcb* pcb = ik_malloc(sizeof(ikpcb));
   bzero(pcb, sizeof(ikpcb));
   pcb->collect_key = false_object;
+  {
+    int i;
+    for(i=0; i<generation_count; i++){
+      pcb->guardians[i] = null_object;
+      pcb->guardians_forward[i] = null_object;
+      pcb->guardians_dropped[i] = null_object;
+    }
+  }
   #define HEAPSIZE (1024 * 4096)
   #define STAKSIZE (1024 * 4096)
   //#define STAKSIZE (256 * 4096)
@@ -885,12 +893,13 @@ ikrt_write_char(){
 
 
 
+#if 0
 ikp 
 ikrt_register_guardian(ikp tc, ikp obj, ikpcb* pcb){
   ik_guardian_table* g = pcb->guardians[0];
   if((!g) || (g->count == ik_guardian_table_size)){
     if(sizeof(ik_guardian_table) != pagesize){
-      fprintf(stderr, "ERR: invaldi guardian table size\n");
+      fprintf(stderr, "ERR: invalid guardian table size\n");
       exit(-1);
     }
     ik_guardian_table* p = 
@@ -906,6 +915,21 @@ ikrt_register_guardian(ikp tc, ikp obj, ikpcb* pcb){
   g->count++;
   return 0;
 }
+#endif
+
+ikp 
+ikrt_register_guardian(ikp tc, ikp obj, ikpcb* pcb){
+  ikp p0 = ik_alloc(pcb, pair_size) + pair_tag;
+  ikp p1 = ik_alloc(pcb, pair_size) + pair_tag;
+  ref(p0, off_car) = tc;
+  ref(p0, off_cdr) = obj;
+  ref(p1, off_car) = p0;
+  ref(p1, off_cdr) = pcb->guardians[0];
+  pcb->guardians[0] = p1;
+  return void_object;
+}
+
+
 
 
 ikp 

bin/ikarus.h

@@ -135,7 +135,9 @@ typedef struct ikpcb{
   int   stack_size;
   ikp   symbol_table;
   ikp   gensym_table;
-  ik_guardian_table* guardians[generation_count];
+  ikp guardians[generation_count];
+  ikp guardians_forward[generation_count];
+  ikp guardians_dropped[generation_count];
   unsigned int* dirty_vector_base;
   unsigned int* segment_vector_base;
   unsigned char* memory_base;

bin/verify-integrity.c

@@ -155,6 +155,9 @@ verify_page(unsigned char* p, unsigned char* base, unsigned int* svec, unsigned
   else if(type == pointers_type){
     return verify_pointers_page(p,s,d,base,svec,dvec);
   }
+  else if(type == weak_pairs_type){
+    return verify_pointers_page(p,s,d,base,svec,dvec);
+  }
   else if(type == symbols_type){
     return verify_pointers_page(p,s,d,base,svec,dvec);
   }

src/makefile.ss

@@ -148,7 +148,7 @@
     [$records    (ikarus system $records)     #f]
     [$ports      (ikarus system $ports)       #f]
     [$codes      (ikarus system $codes)       #f]
-    [$tcbuckets  (ikarus system $tcbuckets)   #f]
+    [$tcbuckets  (ikarus system $tcbuckets)   #t]
     [$io         (ikarus system $io)          #f]
     [$arg-list   (ikarus system $arg-list)    #f]
     [$stack      (ikarus system $stack)       #f]