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# Copyright, 2017, by Samuel G. D. Williams. <http://www.codeotaku.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
require 'objspace'
module RSpec
module Memory
Allocation = Struct.new(:count, :size) do
SLOT_SIZE = ObjectSpace.memsize_of(Object.new)
def << object
self.count += 1
# We don't want to force specs to take the slot size into account.
self.size += ObjectSpace.memsize_of(object) - SLOT_SIZE
end
def self.default_hash
Hash.new{|h,k| h[k] = Allocation.new(0, 0)}
end
end
class Trace
def self.supported?
# There are issues on truffleruby-1.0.0rc9
return false if RUBY_ENGINE == "truffleruby"
ObjectSpace.respond_to?(:trace_object_allocations)
end
if supported?
def self.capture(*args, &block)
self.new(*args).tap do |trace|
trace.capture(&block)
end
end
else
def self.capture(*args, &block)
yield
return nil
end
end
def initialize(klasses)
@klasses = klasses
@allocated = Allocation.default_hash
@retained = Allocation.default_hash
@ignored = Allocation.default_hash
@total = Allocation.new(0, 0)
end
attr :allocated
attr :retained
attr :ignored
attr :total
def current_objects(generation)
allocations = []
ObjectSpace.each_object do |object|
if ObjectSpace.allocation_generation(object) == generation
allocations << object
end
end
return allocations
end
def find_base(object)
@klasses.find{|klass| object.is_a? klass}
end
def capture(&block)
GC.start
begin
GC.disable
generation = GC.count
ObjectSpace.trace_object_allocations(&block)
allocated = current_objects(generation)
ensure
GC.enable
end
GC.start
retained = current_objects(generation)
# All allocated objects, including those freed in the last GC:
allocated.each do |object|
if klass = find_base(object)
@allocated[klass] << object
else
# If the user specified classes, but we can't pin this allocation to a specific class, we issue a warning.
if @klasses.any?
warn "Ignoring allocation of #{object.class} at #{ObjectSpace.allocation_sourcefile(object)}:#{ObjectSpace.allocation_sourceline(object)}"
end
@ignored[object.class] << object
end
@total << object
end
# Retained objects are still alive after a final GC:
retained.each do |object|
if klass = find_base(object)
@retained[klass] << object
end
end
end
end
end
end
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