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require 'objspace' | |
require 'config/environment' | |
require 'fiddle' | |
require 'fiddle/import' | |
extend Fiddle::Importer | |
include Fiddle | |
dlload | |
typealias "VALUE", "unsigned long" | |
Basic = ["VALUE flags", "VALUE klass"] | |
RUBY_FL_USHIFT = 12 | |
RUBY_T_IMEMO = 0x1a # /*!< @see imemo_type */ | |
RUBY_T_MASK = 0x1f | |
RBasic = Class.new(struct Basic) do | |
table = Object.constants.grep(/^RUBY_T_/).each_with_object({}) do |name, obj| | |
obj[Object.const_get(name)] = name.to_s.sub(/^RUBY_/, '').to_sym | |
end | |
TYPE_TABLE = table | |
def imemo? | |
flags & RUBY_T_MASK == RUBY_T_IMEMO | |
end | |
def imemo_type | |
(flags >> RUBY_FL_USHIFT) & 0x0f | |
end | |
def iseq? | |
imemo_type == 7 # https://github.com/ruby/ruby/blob/dc03bdcefbf1fe062c0a7ad7fa5f6829866b8cab/internal.h#L852 | |
end | |
end | |
ptr = Handle::DEFAULT["rb_objspace_each_objects"] | |
rb_objspace_each_objects = Function.new(ptr, [TYPE_VOIDP, TYPE_VOIDP], TYPE_VOID) | |
ptr = Handle::DEFAULT["rb_iseqw_new"] | |
rb_iseq_new = Function.new ptr, [TYPE_VOIDP], TYPE_VOIDP | |
callback = Closure::BlockCaller.new TYPE_INT, [TYPE_VOIDP, TYPE_VOIDP, TYPE_INT, TYPE_VOIDP] do |vstart, vend, stride, data| | |
while vstart != vend | |
slot = RBasic.new(vstart) | |
if slot.imemo? && slot.iseq? | |
iseq = rb_iseq_new.call(vstart).to_value | |
puts [iseq.size, iseq.markable_object_count].join ',' | |
end | |
vstart += stride | |
end | |
0 | |
end | |
GC.start | |
puts "size,markables" | |
rb_objspace_each_objects.call(callback, nil) |
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