rework mruby-objectspace and gc.[ch]

- functions should have C linkage (for C++ code)
- add prefix to each_object_callback
- use more appropriate variable types / initialization
- ObjectSpace::count_objects has 1 opt. arg.
- prefer mrb_intern_lit to mrb_intern_cstr for str. lit.
- mruby/value.h is included by mruby.h
- adjust coding style

include/mruby/gc.h

@@ -7,11 +7,16 @@
 #ifndef MRUBY_GC_H
 #define MRUBY_GC_H
 
-#include "mruby.h"
-#include "mruby/value.h"
+#if defined(__cplusplus)
+extern "C" {
+#endif
 
-typedef void (each_object_callback)(mrb_state *mrb, struct RBasic* obj, void *data);
-void mrb_objspace_each_objects(mrb_state *mrb, each_object_callback* callback, void *data);
+typedef void (mrb_each_object_callback)(mrb_state *mrb, struct RBasic *obj, void *data);
+void mrb_objspace_each_objects(mrb_state *mrb, mrb_each_object_callback *callback, void *data);
 void mrb_free_context(mrb_state *mrb, struct mrb_context *c);
 
+#if defined(__cplusplus)
+}  /* extern "C" { */
+#endif
+
 #endif  /* MRUBY_GC_H */

mrbgems/mruby-objectspace/src/mruby_objectspace.c

 #include <mruby.h>
 #include <mruby/gc.h>
 #include <mruby/hash.h>
-#include <mruby/value.h>
 
 struct os_count_struct {
-  size_t total;
-  size_t freed;
-  size_t counts[MRB_TT_MAXDEFINE+1];
+  mrb_int total;
+  mrb_int freed;
+  mrb_int counts[MRB_TT_MAXDEFINE+1];
 };
 
-void
-os_count_object_type(mrb_state *mrb, struct RBasic* obj, void *data)
+static void
+os_count_object_type(mrb_state *mrb, struct RBasic *obj, void *data)
 {
-  struct os_count_struct* obj_count;
-  obj_count = (struct os_count_struct*)(data);
+  struct os_count_struct *obj_count;
+  obj_count = (struct os_count_struct*)data;
 
   if (is_dead(mrb, obj)) {
     obj_count->freed++;
-  } else {
+  }
+  else {
     obj_count->counts[obj->tt]++;
     obj_count->total++;
   }
@@ -43,11 +43,11 @@ os_count_object_type(mrb_state *mrb, struct RBasic* obj, void *data)
  *
  */
 
-mrb_value
+static mrb_value
 os_count_objects(mrb_state *mrb, mrb_value self)
 {
-  struct os_count_struct obj_count;
-  size_t i;
+  struct os_count_struct obj_count = { 0 };
+  enum mrb_vtype i;
   mrb_value hash;
 
   if (mrb_get_args(mrb, "|H", &hash) == 0) {
@@ -58,21 +58,15 @@ os_count_objects(mrb_state *mrb, mrb_value self)
     mrb_hash_clear(mrb, hash);
   }
 
-  for (i = 0; i <= MRB_TT_MAXDEFINE; i++) {
-    obj_count.counts[i] = 0;
-  }
-  obj_count.total = 0;
-  obj_count.freed = 0;
-
   mrb_objspace_each_objects(mrb, os_count_object_type, &obj_count);
 
-  mrb_hash_set(mrb, hash, mrb_symbol_value(mrb_intern_cstr(mrb, "TOTAL")), mrb_fixnum_value(obj_count.total));
-  mrb_hash_set(mrb, hash, mrb_symbol_value(mrb_intern_cstr(mrb, "FREE")), mrb_fixnum_value(obj_count.freed));
+  mrb_hash_set(mrb, hash, mrb_symbol_value(mrb_intern_lit(mrb, "TOTAL")), mrb_fixnum_value(obj_count.total));
+  mrb_hash_set(mrb, hash, mrb_symbol_value(mrb_intern_lit(mrb, "FREE")), mrb_fixnum_value(obj_count.freed));
 
-  for (i = 0; i < MRB_TT_MAXDEFINE; i++) {
+  for (i = MRB_TT_FALSE; i < MRB_TT_MAXDEFINE; i++) {
     mrb_value type;
     switch (i) {
-#define COUNT_TYPE(t) case (t): type = mrb_symbol_value(mrb_intern_cstr(mrb, #t)); break;
+#define COUNT_TYPE(t) case (t): type = mrb_symbol_value(mrb_intern_lit(mrb, #t)); break;
       COUNT_TYPE(MRB_TT_FALSE);
       COUNT_TYPE(MRB_TT_FREE);
       COUNT_TYPE(MRB_TT_TRUE);
@@ -107,11 +101,13 @@ os_count_objects(mrb_state *mrb, mrb_value self)
 }
 
 void
-mrb_mruby_objectspace_gem_init(mrb_state* mrb) {
+mrb_mruby_objectspace_gem_init(mrb_state *mrb)
+{
   struct RClass *os = mrb_define_module(mrb, "ObjectSpace");
-  mrb_define_class_method(mrb, os, "count_objects", os_count_objects, MRB_ARGS_ANY());
+  mrb_define_class_method(mrb, os, "count_objects", os_count_objects, MRB_ARGS_OPT(1));
 }
 
 void
-mrb_mruby_objectspace_gem_final(mrb_state* mrb) {
+mrb_mruby_objectspace_gem_final(mrb_state *mrb)
+{
 }

src/gc.c

@@ -1281,7 +1281,7 @@ gc_generational_mode_set(mrb_state *mrb, mrb_value self)
 }
 
 void
-mrb_objspace_each_objects(mrb_state *mrb, each_object_callback* callback, void *data)
+mrb_objspace_each_objects(mrb_state *mrb, mrb_each_object_callback *callback, void *data)
 {
   struct heap_page* page = mrb->heaps;