1 files changed, 111 insertions, 0 deletions
diff --git a/mrbgems/mruby-objectspace/src/mruby_objectspace.c b/mrbgems/mruby-objectspace/src/mruby_objectspace.c
new file mode 100644
index 000000000..2d064044d
--- /dev/null
+++ b/mrbgems/mruby-objectspace/src/mruby_objectspace.c
@@ -0,0 +1,111 @@
+#include <mruby.h>
+#include <mruby/gc.h>
+#include <mruby/hash.h>
+#include <stdio.h>
+
+/*
+ *  call-seq:
+ *     ObjectSpace.count_objects([result_hash]) -> hash
+ *
+ *  Counts objects for each type.
+ *
+ *  It returns a hash, such as:
+ *  {
+ *    :TOTAL=>10000,
+ *    :FREE=>3011,
+ *    :MRB_TT_OBJECT=>6,
+ *    :MRB_TT_CLASS=>404,
+ *    # ...
+ *  }
+ *
+ *  If the optional argument +result_hash+ is given,
+ *  it is overwritten and returned. This is intended to avoid probe effect.
+ *
+ */
+
+struct os_count_struct {
+  size_t total;
+  size_t counts[MRB_TT_MAXDEFINE+1];
+};
+
+void os_count_object_type(RVALUE *obj, void *data)
+{
+  struct os_count_struct* obj_count;
+  obj_count = (struct os_count_struct*)(data);
+  obj_count->counts[mrb_type(obj->as.basic)]++;
+  obj_count->total++;
+}
+
+mrb_value
+os_count_objects(mrb_state *mrb, mrb_value self)
+{
+    struct os_count_struct obj_count;
+    size_t freed = 0;
+    size_t i;
+    mrb_value hash;
+    struct heap_page* page = mrb->heaps;
+
+    if (mrb_get_args(mrb, "|H", &hash) == 0) {
+        hash = mrb_hash_new(mrb);
+    }
+
+    if (!mrb_test(mrb_hash_empty_p(mrb, hash))) {
+        mrb_hash_clear(mrb, hash);
+    }
+
+    for (i = 0; i <= MRB_TT_MAXDEFINE; i++) {
+        obj_count.counts[i] = 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(freed));
+
+    for (i = 0; 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;
+      COUNT_TYPE(MRB_TT_FALSE);
+      COUNT_TYPE(MRB_TT_FREE);
+      COUNT_TYPE(MRB_TT_TRUE);
+      COUNT_TYPE(MRB_TT_FIXNUM);
+      COUNT_TYPE(MRB_TT_SYMBOL);
+      COUNT_TYPE(MRB_TT_UNDEF);
+      COUNT_TYPE(MRB_TT_FLOAT);
+      COUNT_TYPE(MRB_TT_VOIDP);
+      COUNT_TYPE(MRB_TT_OBJECT);
+      COUNT_TYPE(MRB_TT_CLASS);
+      COUNT_TYPE(MRB_TT_MODULE);
+      COUNT_TYPE(MRB_TT_ICLASS);
+      COUNT_TYPE(MRB_TT_SCLASS);
+      COUNT_TYPE(MRB_TT_PROC);
+      COUNT_TYPE(MRB_TT_ARRAY);
+      COUNT_TYPE(MRB_TT_HASH);
+      COUNT_TYPE(MRB_TT_STRING);
+      COUNT_TYPE(MRB_TT_RANGE);
+      COUNT_TYPE(MRB_TT_EXCEPTION);
+      COUNT_TYPE(MRB_TT_FILE);
+      COUNT_TYPE(MRB_TT_ENV);
+      COUNT_TYPE(MRB_TT_DATA);
+#undef COUNT_TYPE
+          default:              type = mrb_fixnum_value(i); break;
+        }
+        if (obj_count.counts[i])
+            mrb_hash_set(mrb, hash, type, mrb_fixnum_value(obj_count.counts[i]));
+    }
+
+    return hash;
+}
+
+void
+mrb_mruby_objectspace_gem_init(mrb_state* mrb) {
+  struct RClass *os;
+  os = mrb_define_module(mrb, "ObjectSpace");
+  mrb_define_class_method(mrb, os, "count_objects", os_count_objects, MRB_ARGS_ANY());
+}
+
+void
+mrb_mruby_objectspace_gem_final(mrb_state* mrb) {
+  // finalizer
+}