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ruby--ruby/ext/objspace/objspace.c
nari 68d131d6a5 fix typos 
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38951 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2013-01-26 09:51:34 +00:00

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/**********************************************************************
objspace.c - ObjectSpace extender for MRI.
$Author$
created at: Wed Jun 17 07:39:17 2009
NOTE: This extension library is not expected to exist except C Ruby.
All the files in this distribution are covered under the Ruby's
license (see the file COPYING).
**********************************************************************/
/* objspace library extends ObjectSpace module and add several
* methods to get internal statistic information about
* object/memory management.
*
* Generally, you *SHOULD NOT*use this library if you do not know
* about the MRI implementation. Mainly, this library is for (memory)
* profiler developers and MRI developers who need to know how MRI
* memory usage.
*
*/
#include <ruby/ruby.h>
#include <ruby/st.h>
#include <ruby/io.h>
#include <ruby/re.h>
#include "node.h"
#include "gc.h"
#include "regint.h"
#include "internal.h"
size_t rb_str_memsize(VALUE);
size_t rb_ary_memsize(VALUE);
size_t rb_io_memsize(const rb_io_t *);
size_t rb_generic_ivar_memsize(VALUE);
size_t rb_objspace_data_type_memsize(VALUE obj);
static size_t
memsize_of(VALUE obj)
{
size_t size = 0;
if (SPECIAL_CONST_P(obj)) {
return 0;
}
if (FL_TEST(obj, FL_EXIVAR)) {
size += rb_generic_ivar_memsize(obj);
}
switch (BUILTIN_TYPE(obj)) {
case T_OBJECT:
if (!(RBASIC(obj)->flags & ROBJECT_EMBED) &&
ROBJECT(obj)->as.heap.ivptr) {
size += ROBJECT(obj)->as.heap.numiv * sizeof(VALUE);
}
break;
case T_MODULE:
case T_CLASS:
if (RCLASS_M_TBL(obj)) {
size += st_memsize(RCLASS_M_TBL(obj));
}
if (RCLASS_IV_TBL(obj)) {
size += st_memsize(RCLASS_IV_TBL(obj));
}
if (RCLASS_IV_INDEX_TBL(obj)) {
size += st_memsize(RCLASS_IV_INDEX_TBL(obj));
}
if (RCLASS(obj)->ptr->iv_tbl) {
size += st_memsize(RCLASS(obj)->ptr->iv_tbl);
}
if (RCLASS(obj)->ptr->const_tbl) {
size += st_memsize(RCLASS(obj)->ptr->const_tbl);
}
size += sizeof(rb_classext_t);
break;
case T_STRING:
size += rb_str_memsize(obj);
break;
case T_ARRAY:
size += rb_ary_memsize(obj);
break;
case T_HASH:
if (RHASH(obj)->ntbl) {
size += st_memsize(RHASH(obj)->ntbl);
}
break;
case T_REGEXP:
if (RREGEXP(obj)->ptr) {
size += onig_memsize(RREGEXP(obj)->ptr);
}
break;
case T_DATA:
size += rb_objspace_data_type_memsize(obj);
break;
case T_MATCH:
if (RMATCH(obj)->rmatch) {
struct rmatch *rm = RMATCH(obj)->rmatch;
size += onig_region_memsize(&rm->regs);
size += sizeof(struct rmatch_offset) * rm->char_offset_num_allocated;
size += sizeof(struct rmatch);
}
break;
case T_FILE:
if (RFILE(obj)->fptr) {
size += rb_io_memsize(RFILE(obj)->fptr);
}
break;
case T_RATIONAL:
case T_COMPLEX:
break;
case T_ICLASS:
/* iClass shares table with the module */
break;
case T_FLOAT:
break;
case T_BIGNUM:
if (!(RBASIC(obj)->flags & RBIGNUM_EMBED_FLAG) && RBIGNUM_DIGITS(obj)) {
size += RBIGNUM_LEN(obj) * sizeof(BDIGIT);
}
break;
case T_NODE:
switch (nd_type(obj)) {
case NODE_SCOPE:
if (RNODE(obj)->u1.tbl) {
/* TODO: xfree(RANY(obj)->as.node.u1.tbl); */
}
break;
case NODE_ALLOCA:
/* TODO: xfree(RANY(obj)->as.node.u1.node); */
;
}
break; /* no need to free iv_tbl */
case T_STRUCT:
if ((RBASIC(obj)->flags & RSTRUCT_EMBED_LEN_MASK) == 0 &&
RSTRUCT(obj)->as.heap.ptr) {
size += sizeof(VALUE) * RSTRUCT_LEN(obj);
}
break;
case T_ZOMBIE:
break;
default:
rb_bug("objspace/memsize_of(): unknown data type 0x%x(%p)",
BUILTIN_TYPE(obj), (void*)obj);
}
return size;
}
/*
* call-seq:
* ObjectSpace.memsize_of(obj) -> Integer
*
* Return consuming memory size of obj.
*
* Note that the return size is incomplete. You need to deal with
* this information as only a *HINT*. Especially, the size of
* T_DATA may not be correct.
*
* This method is not expected to work except C Ruby.
*/
static VALUE
memsize_of_m(VALUE self, VALUE obj)
{
return SIZET2NUM(memsize_of(obj));
}
struct total_data {
size_t total;
VALUE klass;
};
static int
total_i(void *vstart, void *vend, size_t stride, void *ptr)
{
VALUE v;
struct total_data *data = (struct total_data *)ptr;
for (v = (VALUE)vstart; v != (VALUE)vend; v += stride) {
if (RBASIC(v)->flags) {
switch (BUILTIN_TYPE(v)) {
case T_NONE:
case T_ICLASS:
case T_NODE:
case T_ZOMBIE:
continue;
case T_CLASS:
if (FL_TEST(v, FL_SINGLETON))
continue;
default:
if (data->klass == 0 || rb_obj_is_kind_of(v, data->klass)) {
data->total += memsize_of(v);
}
}
}
}
return 0;
}
/*
* call-seq:
* ObjectSpace.memsize_of_all([klass]) -> Integer
*
* Return consuming memory size of all living objects.
* If klass (should be Class object) is given, return the total
* memory size of instances of the given class.
*
* Note that the returned size is incomplete. You need to deal with
* this information as only a *HINT*. Especially, the size of
* T_DATA may not be correct.
*
* Note that this method does *NOT* return total malloc'ed memory size.
*
* This method can be defined by the following Ruby code:
*
* def memsize_of_all klass = false
* total = 0
* ObjectSpace.each_objects{|e|
* total += ObjectSpace.memsize_of(e) if klass == false || e.kind_of?(klass)
* }
* total
* end
*
* This method is not expected to work except C Ruby.
*/
static VALUE
memsize_of_all_m(int argc, VALUE *argv, VALUE self)
{
struct total_data data = {0, 0};
if (argc > 0) {
rb_scan_args(argc, argv, "01", &data.klass);
}
rb_objspace_each_objects(total_i, &data);
return SIZET2NUM(data.total);
}
static int
set_zero_i(st_data_t key, st_data_t val, st_data_t arg)
{
VALUE k = (VALUE)key;
VALUE hash = (VALUE)arg;
rb_hash_aset(hash, k, INT2FIX(0));
return ST_CONTINUE;
}
static int
cos_i(void *vstart, void *vend, size_t stride, void *data)
{
size_t *counts = (size_t *)data;
VALUE v = (VALUE)vstart;
for (;v != (VALUE)vend; v += stride) {
if (RBASIC(v)->flags) {
counts[BUILTIN_TYPE(v)] += memsize_of(v);
}
}
return 0;
}
static VALUE
type2sym(enum ruby_value_type i)
{
VALUE type;
switch (i) {
#define CASE_TYPE(t) case t: type = ID2SYM(rb_intern(#t)); break;
CASE_TYPE(T_NONE);
CASE_TYPE(T_OBJECT);
CASE_TYPE(T_CLASS);
CASE_TYPE(T_MODULE);
CASE_TYPE(T_FLOAT);
CASE_TYPE(T_STRING);
CASE_TYPE(T_REGEXP);
CASE_TYPE(T_ARRAY);
CASE_TYPE(T_HASH);
CASE_TYPE(T_STRUCT);
CASE_TYPE(T_BIGNUM);
CASE_TYPE(T_FILE);
CASE_TYPE(T_DATA);
CASE_TYPE(T_MATCH);
CASE_TYPE(T_COMPLEX);
CASE_TYPE(T_RATIONAL);
CASE_TYPE(T_NIL);
CASE_TYPE(T_TRUE);
CASE_TYPE(T_FALSE);
CASE_TYPE(T_SYMBOL);
CASE_TYPE(T_FIXNUM);
CASE_TYPE(T_UNDEF);
CASE_TYPE(T_NODE);
CASE_TYPE(T_ICLASS);
CASE_TYPE(T_ZOMBIE);
#undef CASE_TYPE
default: rb_bug("type2sym: unknown type (%d)", i);
}
return type;
}
/*
* call-seq:
* ObjectSpace.count_objects_size([result_hash]) -> hash
*
* Counts objects size (in bytes) for each type.
*
* Note that this information is incomplete. You need to deal with
* this information as only a *HINT*. Especially, total size of
* T_DATA may not right size.
*
* It returns a hash as:
* {:TOTAL=>1461154, :T_CLASS=>158280, :T_MODULE=>20672, :T_STRING=>527249, ...}
*
* If the optional argument, result_hash, is given,
* it is overwritten and returned.
* This is intended to avoid probe effect.
*
* The contents of the returned hash is implementation defined.
* It may be changed in future.
*
* This method is not expected to work except C Ruby.
*/
static VALUE
count_objects_size(int argc, VALUE *argv, VALUE os)
{
size_t counts[T_MASK+1];
size_t total = 0;
enum ruby_value_type i;
VALUE hash;
if (rb_scan_args(argc, argv, "01", &hash) == 1) {
if (!RB_TYPE_P(hash, T_HASH))
rb_raise(rb_eTypeError, "non-hash given");
}
for (i = 0; i <= T_MASK; i++) {
counts[i] = 0;
}
rb_objspace_each_objects(cos_i, &counts[0]);
if (hash == Qnil) {
hash = rb_hash_new();
}
else if (!RHASH_EMPTY_P(hash)) {
st_foreach(RHASH_TBL(hash), set_zero_i, hash);
}
for (i = 0; i <= T_MASK; i++) {
if (counts[i]) {
VALUE type = type2sym(i);
total += counts[i];
rb_hash_aset(hash, type, SIZET2NUM(counts[i]));
}
}
rb_hash_aset(hash, ID2SYM(rb_intern("TOTAL")), SIZET2NUM(total));
return hash;
}
static int
cn_i(void *vstart, void *vend, size_t stride, void *n)
{
size_t *nodes = (size_t *)n;
VALUE v = (VALUE)vstart;
for (; v != (VALUE)vend; v += stride) {
if (RBASIC(v)->flags && BUILTIN_TYPE(v) == T_NODE) {
size_t s = nd_type((NODE *)v);
nodes[s]++;
}
}
return 0;
}
/*
* call-seq:
* ObjectSpace.count_nodes([result_hash]) -> hash
*
* Counts nodes for each node type.
*
* This method is not for ordinary Ruby programmers, but for MRI developers
* who have interest in MRI performance and memory usage.
*
* It returns a hash as:
* {:NODE_METHOD=>2027, :NODE_FBODY=>1927, :NODE_CFUNC=>1798, ...}
*
* If the optional argument, result_hash, is given,
* it is overwritten and returned.
* This is intended to avoid probe effect.
*
* The contents of the returned hash is implementation defined.
* It may be changed in future.
*
* This method is not expected to work except C Ruby.
*/
static VALUE
count_nodes(int argc, VALUE *argv, VALUE os)
{
size_t nodes[NODE_LAST+1];
size_t i;
VALUE hash;
if (rb_scan_args(argc, argv, "01", &hash) == 1) {
if (!RB_TYPE_P(hash, T_HASH))
rb_raise(rb_eTypeError, "non-hash given");
}
for (i = 0; i <= NODE_LAST; i++) {
nodes[i] = 0;
}
rb_objspace_each_objects(cn_i, &nodes[0]);
if (hash == Qnil) {
hash = rb_hash_new();
}
else if (!RHASH_EMPTY_P(hash)) {
st_foreach(RHASH_TBL(hash), set_zero_i, hash);
}
for (i=0; i<NODE_LAST; i++) {
if (nodes[i] != 0) {
VALUE node;
switch (i) {
#define COUNT_NODE(n) case n: node = ID2SYM(rb_intern(#n)); break;
COUNT_NODE(NODE_SCOPE);
COUNT_NODE(NODE_BLOCK);
COUNT_NODE(NODE_IF);
COUNT_NODE(NODE_CASE);
COUNT_NODE(NODE_WHEN);
COUNT_NODE(NODE_OPT_N);
COUNT_NODE(NODE_WHILE);
COUNT_NODE(NODE_UNTIL);
COUNT_NODE(NODE_ITER);
COUNT_NODE(NODE_FOR);
COUNT_NODE(NODE_BREAK);
COUNT_NODE(NODE_NEXT);
COUNT_NODE(NODE_REDO);
COUNT_NODE(NODE_RETRY);
COUNT_NODE(NODE_BEGIN);
COUNT_NODE(NODE_RESCUE);
COUNT_NODE(NODE_RESBODY);
COUNT_NODE(NODE_ENSURE);
COUNT_NODE(NODE_AND);
COUNT_NODE(NODE_OR);
COUNT_NODE(NODE_MASGN);
COUNT_NODE(NODE_LASGN);
COUNT_NODE(NODE_DASGN);
COUNT_NODE(NODE_DASGN_CURR);
COUNT_NODE(NODE_GASGN);
COUNT_NODE(NODE_IASGN);
COUNT_NODE(NODE_IASGN2);
COUNT_NODE(NODE_CDECL);
COUNT_NODE(NODE_CVASGN);
COUNT_NODE(NODE_CVDECL);
COUNT_NODE(NODE_OP_ASGN1);
COUNT_NODE(NODE_OP_ASGN2);
COUNT_NODE(NODE_OP_ASGN_AND);
COUNT_NODE(NODE_OP_ASGN_OR);
COUNT_NODE(NODE_CALL);
COUNT_NODE(NODE_FCALL);
COUNT_NODE(NODE_VCALL);
COUNT_NODE(NODE_SUPER);
COUNT_NODE(NODE_ZSUPER);
COUNT_NODE(NODE_ARRAY);
COUNT_NODE(NODE_ZARRAY);
COUNT_NODE(NODE_VALUES);
COUNT_NODE(NODE_HASH);
COUNT_NODE(NODE_RETURN);
COUNT_NODE(NODE_YIELD);
COUNT_NODE(NODE_LVAR);
COUNT_NODE(NODE_DVAR);
COUNT_NODE(NODE_GVAR);
COUNT_NODE(NODE_IVAR);
COUNT_NODE(NODE_CONST);
COUNT_NODE(NODE_CVAR);
COUNT_NODE(NODE_NTH_REF);
COUNT_NODE(NODE_BACK_REF);
COUNT_NODE(NODE_MATCH);
COUNT_NODE(NODE_MATCH2);
COUNT_NODE(NODE_MATCH3);
COUNT_NODE(NODE_LIT);
COUNT_NODE(NODE_STR);
COUNT_NODE(NODE_DSTR);
COUNT_NODE(NODE_XSTR);
COUNT_NODE(NODE_DXSTR);
COUNT_NODE(NODE_EVSTR);
COUNT_NODE(NODE_DREGX);
COUNT_NODE(NODE_DREGX_ONCE);
COUNT_NODE(NODE_ARGS);
COUNT_NODE(NODE_ARGS_AUX);
COUNT_NODE(NODE_OPT_ARG);
COUNT_NODE(NODE_POSTARG);
COUNT_NODE(NODE_ARGSCAT);
COUNT_NODE(NODE_ARGSPUSH);
COUNT_NODE(NODE_SPLAT);
COUNT_NODE(NODE_TO_ARY);
COUNT_NODE(NODE_BLOCK_ARG);
COUNT_NODE(NODE_BLOCK_PASS);
COUNT_NODE(NODE_DEFN);
COUNT_NODE(NODE_DEFS);
COUNT_NODE(NODE_ALIAS);
COUNT_NODE(NODE_VALIAS);
COUNT_NODE(NODE_UNDEF);
COUNT_NODE(NODE_CLASS);
COUNT_NODE(NODE_MODULE);
COUNT_NODE(NODE_SCLASS);
COUNT_NODE(NODE_COLON2);
COUNT_NODE(NODE_COLON3);
COUNT_NODE(NODE_DOT2);
COUNT_NODE(NODE_DOT3);
COUNT_NODE(NODE_FLIP2);
COUNT_NODE(NODE_FLIP3);
COUNT_NODE(NODE_SELF);
COUNT_NODE(NODE_NIL);
COUNT_NODE(NODE_TRUE);
COUNT_NODE(NODE_FALSE);
COUNT_NODE(NODE_ERRINFO);
COUNT_NODE(NODE_DEFINED);
COUNT_NODE(NODE_POSTEXE);
COUNT_NODE(NODE_ALLOCA);
COUNT_NODE(NODE_BMETHOD);
COUNT_NODE(NODE_MEMO);
COUNT_NODE(NODE_IFUNC);
COUNT_NODE(NODE_DSYM);
COUNT_NODE(NODE_ATTRASGN);
COUNT_NODE(NODE_PRELUDE);
COUNT_NODE(NODE_LAMBDA);
#undef COUNT_NODE
default: node = INT2FIX(nodes[i]);
}
rb_hash_aset(hash, node, SIZET2NUM(nodes[i]));
}
}
return hash;
}
static int
cto_i(void *vstart, void *vend, size_t stride, void *data)
{
VALUE hash = (VALUE)data;
VALUE v = (VALUE)vstart;
for (; v != (VALUE)vend; v += stride) {
if (RBASIC(v)->flags && BUILTIN_TYPE(v) == T_DATA) {
VALUE counter;
VALUE key = RBASIC(v)->klass;
if (key == 0) {
const char *name = rb_objspace_data_type_name(v);
if (name == 0) name = "unknown";
key = ID2SYM(rb_intern(name));
}
counter = rb_hash_aref(hash, key);
if (NIL_P(counter)) {
counter = INT2FIX(1);
}
else {
counter = INT2FIX(FIX2INT(counter) + 1);
}
rb_hash_aset(hash, key, counter);
}
}
return 0;
}
/*
* call-seq:
* ObjectSpace.count_tdata_objects([result_hash]) -> hash
*
* Counts objects for each T_DATA type.
*
* This method is not for ordinary Ruby programmers, but for MRI developers
* who interest on MRI performance.
*
* It returns a hash as:
* {RubyVM::InstructionSequence=>504, :parser=>5, :barrier=>6,
* :mutex=>6, Proc=>60, RubyVM::Env=>57, Mutex=>1, Encoding=>99,
* ThreadGroup=>1, Binding=>1, Thread=>1, RubyVM=>1, :iseq=>1,
* Random=>1, ARGF.class=>1, Data=>1, :autoload=>3, Time=>2}
* # T_DATA objects existing at startup on r32276.
*
* If the optional argument, result_hash, is given,
* it is overwritten and returned.
* This is intended to avoid probe effect.
*
* The contents of the returned hash is implementation defined.
* It may be changed in future.
*
* In this version, keys are Class object or Symbol object.
* If object is kind of normal (accessible) object, the key is Class object.
* If object is not a kind of normal (internal) object, the key is symbol
* name, registered by rb_data_type_struct.
*
* This method is not expected to work except C Ruby.
*
*/
static VALUE
count_tdata_objects(int argc, VALUE *argv, VALUE self)
{
VALUE hash;
if (rb_scan_args(argc, argv, "01", &hash) == 1) {
if (!RB_TYPE_P(hash, T_HASH))
rb_raise(rb_eTypeError, "non-hash given");
}
if (hash == Qnil) {
hash = rb_hash_new();
}
else if (!RHASH_EMPTY_P(hash)) {
st_foreach(RHASH_TBL(hash), set_zero_i, hash);
}
rb_objspace_each_objects(cto_i, (void *)hash);
return hash;
}
static void
iow_mark(void *ptr)
{
rb_gc_mark((VALUE)ptr);
}
static size_t
iow_size(const void *ptr)
{
VALUE obj = (VALUE)ptr;
return memsize_of(obj);
}
static const rb_data_type_t iow_data_type = {
"ObjectSpace::InternalObjectWrapper",
{iow_mark, 0, iow_size,},
};
static VALUE rb_mInternalObjectWrapper;
static VALUE
iow_newobj(VALUE obj)
{
return rb_data_typed_object_alloc(rb_mInternalObjectWrapper, (void *)obj, &iow_data_type);
}
static VALUE
iow_type(VALUE self)
{
VALUE obj = (VALUE)DATA_PTR(self);
return type2sym(BUILTIN_TYPE(obj));
}
static VALUE
iow_inspect(VALUE self)
{
VALUE obj = (VALUE)DATA_PTR(self);
VALUE type = type2sym(BUILTIN_TYPE(obj));
return rb_sprintf("#<InternalObject:%p %s>", (void *)obj, rb_id2name(SYM2ID(type)));
}
static VALUE
iow_internal_object_id(VALUE self)
{
VALUE obj = (VALUE)DATA_PTR(self);
return rb_obj_id(obj);
}
struct rof_data {
st_table *refs;
VALUE internals;
};
static void
reachable_object_from_i(VALUE obj, void *data_ptr)
{
struct rof_data *data = (struct rof_data *)data_ptr;
VALUE key = obj;
VALUE val = obj;
if (rb_objspace_markable_object_p(obj)) {
if (rb_objspace_internal_object_p(obj)) {
val = iow_newobj(obj);
rb_ary_push(data->internals, val);
}
st_insert(data->refs, key, val);
}
}
static int
collect_values(st_data_t key, st_data_t value, st_data_t data)
{
VALUE ary = (VALUE)data;
rb_ary_push(ary, (VALUE)value);
return ST_CONTINUE;
}
/*
* call-seq:
* ObjectSpace.reachable_objects_from(obj) -> array or nil
*
* [MRI specific feature] Return all reachable objects from `obj'.
*
* This method returns all reachable objects from `obj'.
* If `obj' has references two or more references to same object `x',
* them returned array only include one `x' object.
* If `obj' is non-markable (non-heap management) object such as
* true, false, nil, symbols and Fixnums (and Flonum) them it simply
* returns nil.
*
* If `obj' has references to internal object, then it returns
* instances of `ObjectSpace::InternalObjectWrapper' class.
* This object contains a reference to an internal object and
* you can check the type of internal object with `type' method.
*
* If `obj' is instance of `ObjectSpace::InternalObjectWrapper'
* class, then this method returns all reachable object from
* an internal object, which is pointed by `obj'.
*
* With this method, you can find memory leaks.
*
* This method is not expected to work except C Ruby.
*
* Example:
* ObjectSpace.reachable_objects_from(['a', 'b', 'c'])
* #=> [Array, 'a', 'b', 'c']
*
* ObjectSpace.reachable_objects_from(['a', 'a', 'a'])
* #=> [Array, 'a', 'a', 'a'] # all 'a' strings have different object id
*
* ObjectSpace.reachable_objects_from([v = 'a', v, v])
* #=> [Array, 'a']
*
* ObjectSpace.reachable_objects_from(1)
* #=> nil # 1 is not markable (heap managed) object
*
*/
static VALUE
reachable_objects_from(VALUE self, VALUE obj)
{
if (rb_objspace_markable_object_p(obj)) {
VALUE ret = rb_ary_new();
struct rof_data data;
if (rb_typeddata_is_kind_of(obj, &iow_data_type)) {
obj = (VALUE)DATA_PTR(obj);
}
data.refs = st_init_numtable();
data.internals = rb_ary_new();
rb_objspace_reachable_objects_from(obj, reachable_object_from_i, &data);
st_foreach(data.refs, collect_values, (st_data_t)ret);
return ret;
}
else {
return Qnil;
}
}
/* objspace library extends ObjectSpace module and add several
* methods to get internal statistic information about
* object/memory management.
*
* Generally, you *SHOULD NOT*use this library if you do not know
* about the MRI implementation. Mainly, this library is for (memory)
* profiler developers and MRI developers who need to know how MRI
* memory usage.
*/
void
Init_objspace(void)
{
VALUE rb_mObjSpace = rb_const_get(rb_cObject, rb_intern("ObjectSpace"));
rb_define_module_function(rb_mObjSpace, "memsize_of", memsize_of_m, 1);
rb_define_module_function(rb_mObjSpace, "memsize_of_all", memsize_of_all_m, -1);
rb_define_module_function(rb_mObjSpace, "count_objects_size", count_objects_size, -1);
rb_define_module_function(rb_mObjSpace, "count_nodes", count_nodes, -1);
rb_define_module_function(rb_mObjSpace, "count_tdata_objects", count_tdata_objects, -1);
rb_define_module_function(rb_mObjSpace, "reachable_objects_from", reachable_objects_from, 1);
rb_mInternalObjectWrapper = rb_define_class_under(rb_mObjSpace, "InternalObjectWrapper", rb_cObject);
rb_define_method(rb_mInternalObjectWrapper, "type", iow_type, 0);
rb_define_method(rb_mInternalObjectWrapper, "inspect", iow_inspect, 0);
rb_define_method(rb_mInternalObjectWrapper, "internal_object_id", iow_internal_object_id, 0);
}
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