Module: ObjectSpace

Defined in:
objspace.c,
objspace.c,
objspace_dump.c,
object_tracing.c

Overview

The objspace library extends the ObjectSpace module and adds several methods to get internal statistic information about object/memory management.

You need to require 'objspace' to use this extension module.

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 about MRI memory usage.

Defined Under Namespace

Classes: InternalObjectWrapper

Class Method Summary collapse

Class Method Details

.allocation_class_path(object) ⇒ String

Returns the class for the given object.

class A

def foo
  ObjectSpace::trace_object_allocations do
    obj = Object.new
    p "#{ObjectSpace::allocation_class_path(obj)}"
  end
end

end

A.new.foo #=> “Class”

See ::trace_object_allocations for more information and examples.

Returns:

  • (String)

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# File 'object_tracing.c', line 394

static VALUE
allocation_class_path(VALUE self, VALUE obj)
{
    struct allocation_info *info = lookup_allocation_info(obj);

    if (info && info->class_path) {
	return rb_str_new2(info->class_path);
    }
    else {
	return Qnil;
    }
}

.allocation_generation(object) ⇒ Fixnum

Returns garbage collector generation for the given object.

class B

include ObjectSpace

def foo
  trace_object_allocations do
    obj = Object.new
    p "Generation is #{allocation_generation(obj)}"
  end
end

end

B.new.foo #=> “Generation is 3”

See ::trace_object_allocations for more information and examples.

Returns:

  • (Fixnum)

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# File 'object_tracing.c', line 459

static VALUE
allocation_generation(VALUE self, VALUE obj)
{
    struct allocation_info *info = lookup_allocation_info(obj);
    if (info) {
	return SIZET2NUM(info->generation);
    }
    else {
	return Qnil;
    }
}

.allocation_method_id(object) ⇒ String

Returns the method identifier for the given object.

class A

include ObjectSpace

def foo
  trace_object_allocations do
    obj = Object.new
    p "#{allocation_class_path(obj)}##{allocation_method_id(obj)}"
  end
end

end

A.new.foo #=> “Class#new”

See ::trace_object_allocations for more information and examples.

Returns:

  • (String)

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# File 'object_tracing.c', line 427

static VALUE
allocation_method_id(VALUE self, VALUE obj)
{
    struct allocation_info *info = lookup_allocation_info(obj);
    if (info) {
	return info->mid;
    }
    else {
	return Qnil;
    }
}

.allocation_sourcefile(object) ⇒ String

Returns the source file origin from the given object.

See ::trace_object_allocations for more information and examples.

Returns:

  • (String)

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# File 'object_tracing.c', line 343

static VALUE
allocation_sourcefile(VALUE self, VALUE obj)
{
    struct allocation_info *info = lookup_allocation_info(obj);

    if (info && info->path) {
	return rb_str_new2(info->path);
    }
    else {
	return Qnil;
    }
}

.allocation_sourceline(object) ⇒ String

Returns the original line from source for from the given object.

See ::trace_object_allocations for more information and examples.

Returns:

  • (String)

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# File 'object_tracing.c', line 363

static VALUE
allocation_sourceline(VALUE self, VALUE obj)
{
    struct allocation_info *info = lookup_allocation_info(obj);

    if (info) {
	return INT2FIX(info->line);
    }
    else {
	return Qnil;
    }
}

.count_nodes([result_hash]) ⇒ Hash

Counts nodes for each node type.

This method is only for MRI developers interested in performance and memory usage of Ruby programs.

It returns a hash as:

: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.

Note: The contents of the returned hash is implementation defined. It may be changed in future.

This method is only expected to work with C Ruby.

Returns:

  • (Hash)

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# File 'objspace.c', line 275

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_OP_CDECL);
		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_KW_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_CREF);
		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(i);
	    }
	    rb_hash_aset(hash, node, SIZET2NUM(nodes[i]));
	}
    }
    return hash;
}

.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 only expected to work with C Ruby.

Returns:

  • (Hash)

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# File 'objspace.c', line 199

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;
}

.count_tdata_objects([result_hash]) ⇒ Hash

Counts objects for each T_DATA type.

This method is only for MRI developers interested in performance and memory usage of Ruby programs.

It returns a hash as:

: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 specific and may change in the 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 only expected to work with C Ruby.

Returns:

  • (Hash)

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# File 'objspace.c', line 484

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;
}

.dump(obj[, output: :string]) ⇒ Object .dump(obj, output::file) ⇒ #<File:/tmp/rubyobj20131125-88733-1xkfmpv.json .dump(obj, output::stdout) ⇒ nil

Dump the contents of a ruby object as JSON.

This method is only expected to work with C Ruby. This is an experimental method and is subject to change. In particular, the function signature and output format are not guaranteed to be compatible in future versions of ruby.

Overloads:

  • .dump(obj, output::file) ⇒ #<File:/tmp/rubyobj20131125-88733-1xkfmpv.json

    Returns ]

    Returns:

    • (#<File:/tmp/rubyobj20131125-88733-1xkfmpv.json)

      ]

  • .dump(obj, output::stdout) ⇒ nil

    Returns:

    • (nil)

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# File 'objspace_dump.c', line 362

static VALUE
objspace_dump(int argc, VALUE *argv, VALUE os)
{
    static const char filename[] = "rubyobj";
    VALUE obj = Qnil, opts = Qnil, output;
    struct dump_config dc = {0,};

    rb_scan_args(argc, argv, "1:", &obj, &opts);

    output = dump_output(&dc, opts, sym_string, filename);

    dump_object(obj, &dc);

    return dump_result(&dc, output);
}

.dump_all([output: :file]) ⇒ #<File:/tmp/rubyheap20131125-88469-laoj3v.json .dump_all(output::stdout) ⇒ nil .dump_all(output::string) ⇒ Object .dump_all(output:) ⇒ Object .open('heap.json', 'w') ⇒ #<File:heap.json

Dump the contents of the ruby heap as JSON.

This method is only expected to work with C Ruby. This is an experimental method and is subject to change. In particular, the function signature and output format are not guaranteed to be compatible in future versions of ruby.

Overloads:

  • .dump_all([output: :file]) ⇒ #<File:/tmp/rubyheap20131125-88469-laoj3v.json

    Returns ]

    Returns:

    • (#<File:/tmp/rubyheap20131125-88469-laoj3v.json)

      ]

  • .dump_all(output::stdout) ⇒ nil

    Returns:

    • (nil)
  • .open('heap.json', 'w') ⇒ #<File:heap.json

    Returns ]

    Returns:

    • (#<File:heap.json)

      ]


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# File 'objspace_dump.c', line 394

static VALUE
objspace_dump_all(int argc, VALUE *argv, VALUE os)
{
    static const char filename[] = "rubyheap";
    VALUE opts = Qnil, output;
    struct dump_config dc = {0,};

    rb_scan_args(argc, argv, "0:", &opts);

    output = dump_output(&dc, opts, sym_file, filename);

    /* dump roots */
    rb_objspace_reachable_objects_from_root(root_obj_i, &dc);
    if (dc.roots) dump_append(&dc, "]}\n");

    /* dump all objects */
    rb_objspace_each_objects(heap_i, &dc);

    return dump_result(&dc, output);
}

.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 only expected to work with C Ruby.

Returns:

  • (Integer)

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# File 'objspace.c', line 36

static VALUE
memsize_of_m(VALUE self, VALUE obj)
{
    return SIZET2NUM(rb_obj_memsize_of(obj));
}

.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_object{|e| total += ObjectSpace.memsize_of(e) if klass == false || e.kind_of?(klass) } total end

This method is only expected to work with C Ruby.

Returns:

  • (Integer)

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# File 'objspace.c', line 103

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);
}

.reachable_objects_from(obj) ⇒ Array?

MRI specific feature

Return all reachable objects from `obj'.

This method returns all reachable objects from `obj'.

If `obj' has two or more references to the same object `x', then returned array only includes one `x' object.

If `obj' is a non-markable (non-heap management) object such as true, false, nil, symbols and Fixnums (and Flonum) then it simply returns nil.

If `obj' has references to an 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 only expected to work except with 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

Returns:

  • (Array, nil)

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# File 'objspace.c', line 630

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;
    }
}

.reachable_objects_from_rootHash

MRI specific feature

Return all reachable objects from root.

Returns:

  • (Hash)

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# File 'objspace.c', line 708

static VALUE
reachable_objects_from_root(VALUE self)
{
    struct rofr_data data;
    VALUE hash = data.categories = rb_hash_new();
    data.last_category = 0;

    rb_funcall(hash, rb_intern("compare_by_identity"), 0);
    rb_objspace_reachable_objects_from_root(reachable_object_from_root_i, &data);
    rb_hash_foreach(hash, collect_values_of_values, hash);

    return hash;
}

.trace_object_allocations { ... } ⇒ Object

Starts tracing object allocations from the ObjectSpace extension module.

For example:

require 'objspace'

class C

include ObjectSpace

def foo
  trace_object_allocations do
    obj = Object.new
    p "#{allocation_sourcefile(obj)}:#{allocation_sourceline(obj)}"
  end
end

end

C.new.foo #=> “objtrace.rb:8”

This example has included the ObjectSpace module to make it easier to read, but you can also use the ::trace_object_allocations notation (recommended).

Note that this feature introduces a huge performance decrease and huge memory consumption.

Yields:


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# File 'object_tracing.c', line 269

static VALUE
trace_object_allocations(VALUE self)
{
    trace_object_allocations_start(self);
    return rb_ensure(rb_yield, Qnil, trace_object_allocations_stop, self);
}

.trace_object_allocations_clearObject

Clear recorded tracing information.


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# File 'object_tracing.c', line 225

static VALUE
trace_object_allocations_clear(VALUE self)
{
    struct traceobj_arg *arg = get_traceobj_arg();

    /* clear tables */
    st_foreach(arg->object_table, free_values_i, 0);
    st_clear(arg->object_table);
    st_foreach(arg->str_table, free_keys_i, 0);
    st_clear(arg->str_table);

    /* do not touch TracePoints */

    return Qnil;
}

.trace_object_allocations_debug_startObject


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# File 'object_tracing.c', line 306

static VALUE
trace_object_allocations_debug_start(VALUE self)
{
    tmp_keep_remains = 1;
    if (object_allocations_reporter_registered == 0) {
	object_allocations_reporter_registered = 1;
	rb_bug_reporter_add(object_allocations_reporter, 0);
    }

    return trace_object_allocations_start(self);
}

.trace_object_allocations_startObject

Starts tracing object allocations.


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# File 'object_tracing.c', line 171

static VALUE
trace_object_allocations_start(VALUE self)
{
    struct traceobj_arg *arg = get_traceobj_arg();

    if (arg->running++ > 0) {
	/* do nothing */
    }
    else {
	if (arg->newobj_trace == 0) {
	    arg->newobj_trace = rb_tracepoint_new(0, RUBY_INTERNAL_EVENT_NEWOBJ, newobj_i, arg);
	    arg->freeobj_trace = rb_tracepoint_new(0, RUBY_INTERNAL_EVENT_FREEOBJ, freeobj_i, arg);
	}
	rb_tracepoint_enable(arg->newobj_trace);
	rb_tracepoint_enable(arg->freeobj_trace);
    }

    return Qnil;
}

.trace_object_allocations_stopObject

Stop tracing object allocations.

Note that if ::trace_object_allocations_start is called n-times, then tracing will stop after calling ::trace_object_allocations_stop n-times.


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# File 'object_tracing.c', line 200

static VALUE
trace_object_allocations_stop(VALUE self)
{
    struct traceobj_arg *arg = get_traceobj_arg();

    if (arg->running > 0) {
	arg->running--;
    }

    if (arg->running == 0) {
	rb_tracepoint_disable(arg->newobj_trace);
	rb_tracepoint_disable(arg->freeobj_trace);
	arg->newobj_trace = 0;
	arg->freeobj_trace = 0;
    }

    return Qnil;
}