In Ruby 1.9 (YARV) you can get a count of all currently allocated objects like so:
ObjectSpace.count_objects
which returns a hash like
Just a guess: I assume :T_ICLASS
counts include classes and :T_NODE
could maybe stand for AST nodes.
Here's a full list (unfortunately without comments):
#define T_NONE RUBY_T_NONE
#define T_NIL RUBY_T_NIL
#define T_OBJECT RUBY_T_OBJECT
#define T_CLASS RUBY_T_CLASS
#define T_ICLASS RUBY_T_ICLASS
#define T_MODULE RUBY_T_MODULE
#define T_FLOAT RUBY_T_FLOAT
#define T_STRING RUBY_T_STRING
#define T_REGEXP RUBY_T_REGEXP
#define T_ARRAY RUBY_T_ARRAY
#define T_HASH RUBY_T_HASH
#define T_STRUCT RUBY_T_STRUCT
#define T_BIGNUM RUBY_T_BIGNUM
#define T_FILE RUBY_T_FILE
#define T_FIXNUM RUBY_T_FIXNUM
#define T_TRUE RUBY_T_TRUE
#define T_FALSE RUBY_T_FALSE
#define T_DATA RUBY_T_DATA
#define T_MATCH RUBY_T_MATCH
#define T_SYMBOL RUBY_T_SYMBOL
#define T_RATIONAL RUBY_T_RATIONAL
#define T_COMPLEX RUBY_T_COMPLEX
#define T_UNDEF RUBY_T_UNDEF
#define T_NODE RUBY_T_NODE
#define T_ZOMBIE RUBY_T_ZOMBIE
#define T_MASK RUBY_T_MASK
The RUBY_T_xyz
enum is defined like this:
enum ruby_value_type {
RUBY_T_NONE = 0x00,
RUBY_T_OBJECT = 0x01,
RUBY_T_CLASS = 0x02,
RUBY_T_MODULE = 0x03,
RUBY_T_FLOAT = 0x04,
RUBY_T_STRING = 0x05,
RUBY_T_REGEXP = 0x06,
RUBY_T_ARRAY = 0x07,
RUBY_T_HASH = 0x08,
RUBY_T_STRUCT = 0x09,
RUBY_T_BIGNUM = 0x0a,
RUBY_T_FILE = 0x0b,
RUBY_T_DATA = 0x0c,
RUBY_T_MATCH = 0x0d,
RUBY_T_COMPLEX = 0x0e,
RUBY_T_RATIONAL = 0x0f,
RUBY_T_NIL = 0x11,
RUBY_T_TRUE = 0x12,
RUBY_T_FALSE = 0x13,
RUBY_T_SYMBOL = 0x14,
RUBY_T_FIXNUM = 0x15,
RUBY_T_UNDEF = 0x1b,
RUBY_T_NODE = 0x1c,
RUBY_T_ICLASS = 0x1d,
RUBY_T_ZOMBIE = 0x1e,
RUBY_T_MASK = 0x1f
};
I think most of those are rather obvious. The only ones I can't figure out are T_DATA
(see @banister's comment), T_ZOMBIE
and T_MASK
.
BTW: Note that these are not part of Ruby 1.9. They are part of YARV. They might be totally different on other implementations of Ruby 1.9 or even not exist at all. The documentation clearly states:
The contents of the returned hash is implementation defined. It may be changed in future.
In fact, it isn't even guaranteed that the method itself exists:
This method is not expected to work except C Ruby.
(By which the author presumably means that the method is only guaranteed to work on MRI and YARV.)
The types are described in the file doc/extension.doc in Ruby source code:
T_NIL :: nil
T_OBJECT :: ordinary object
T_CLASS :: class
T_MODULE :: module
T_FLOAT :: floating point number
T_STRING :: string
T_REGEXP :: regular expression
T_ARRAY :: array
T_HASH :: associative array
T_STRUCT :: (Ruby) structure
T_BIGNUM :: multi precision integer
T_FIXNUM :: Fixnum(31bit or 63bit integer)
T_COMPLEX :: complex number
T_RATIONAL :: rational number
T_FILE :: IO
T_TRUE :: true
T_FALSE :: false
T_DATA :: data
T_SYMBOL :: symbol
In addition, there are several other types used internally:
T_ICLASS :: included module
T_MATCH :: MatchData object
T_UNDEF :: undefined
T_NODE :: syntax tree node
T_ZOMBIE :: object awaiting finalization
You can get more information about the T_DATA
category by calling ObjectSpace.count_tdata_objects
(described here).
I believe that these are native objects controlled by the VM. Sometimes native extensions can allocate them, as well.