Class: Async::RSpec::Memory::Trace

Inherits:
Object
  • Object
show all
Defined in:
lib/async/rspec/memory/trace.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(klasses) ⇒ Trace

Returns a new instance of Trace.



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# File 'lib/async/rspec/memory/trace.rb', line 60

def initialize(klasses)
  @klasses = klasses
  
  @allocated = Allocation.default_hash
  @retained = Allocation.default_hash
  
  @ignored = Allocation.default_hash
  
  @total = Allocation.new(0, 0)
end

Instance Attribute Details

#allocated ⇒ Object (readonly)

Returns the value of attribute allocated.



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# File 'lib/async/rspec/memory/trace.rb', line 71

def allocated
  @allocated
end

#ignored ⇒ Object (readonly)

Returns the value of attribute ignored.



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# File 'lib/async/rspec/memory/trace.rb', line 74

def ignored
  @ignored
end

#retained ⇒ Object (readonly)

Returns the value of attribute retained.



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# File 'lib/async/rspec/memory/trace.rb', line 72

def retained
  @retained
end

#total ⇒ Object (readonly)

Returns the value of attribute total.



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# File 'lib/async/rspec/memory/trace.rb', line 76

def total
  @total
end

Class Method Details

.capture(&block) ⇒ Object 



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# File 'lib/async/rspec/memory/trace.rb', line 47

def self.capture(*args, &block)
  self.new(*args).tap do |trace|
    trace.capture(&block)
  end
end

.supported? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/async/rspec/memory/trace.rb', line 42

def self.supported?
  ObjectSpace.respond_to? :trace_object_allocations
end

Instance Method Details

#capture(&block) ⇒ Object 



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# File 'lib/async/rspec/memory/trace.rb', line 94

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

#current_objects(generation) ⇒ Object 



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# File 'lib/async/rspec/memory/trace.rb', line 78

def current_objects(generation)
  allocations = []
  
  ObjectSpace.each_object do |object|
    if ObjectSpace.allocation_generation(object) == generation
      allocations << object
    end
  end
  
  return allocations
end

#find_base(object) ⇒ Object 



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# File 'lib/async/rspec/memory/trace.rb', line 90

def find_base(object)
  @klasses.find{|klass| object.is_a? klass}
end