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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
# Why do we not test that finalizers are run by the GC? The documentation
# says that finalizers are never guaranteed to be run, so we can't
# spec that they are. On some implementations of Ruby the finalizers may
# run asynchronously, meaning that we can't predict when they'll run,
# even if they were guaranteed to do so. Even on MRI finalizers can be
# very unpredictable, due to conservative stack scanning and references
# left in unused memory.
describe "ObjectSpace.define_finalizer" do
it "raises an ArgumentError if the action does not respond to call" do
-> {
ObjectSpace.define_finalizer(Object.new, mock("ObjectSpace.define_finalizer no #call"))
}.should raise_error(ArgumentError)
end
it "accepts an object and a proc" do
handler = -> id { id }
ObjectSpace.define_finalizer(Object.new, handler).should == [0, handler]
end
it "accepts an object and a bound method" do
handler = mock("callable")
def handler.finalize(id) end
finalize = handler.method(:finalize)
ObjectSpace.define_finalizer(Object.new, finalize).should == [0, finalize]
end
it "accepts an object and a callable" do
handler = mock("callable")
def handler.call(id) end
ObjectSpace.define_finalizer(Object.new, handler).should == [0, handler]
end
it "accepts an object and a block" do
handler = -> id { id }
ObjectSpace.define_finalizer(Object.new, &handler).should == [0, handler]
end
it "raises ArgumentError trying to define a finalizer on a non-reference" do
-> {
ObjectSpace.define_finalizer(:blah) { 1 }
}.should raise_error(ArgumentError)
end
# see [ruby-core:24095]
it "calls finalizer on process termination" do
code = <<-RUBY
def scoped
Proc.new { puts "finalizer run" }
end
handler = scoped
obj = "Test"
ObjectSpace.define_finalizer(obj, handler)
exit 0
RUBY
ruby_exe(code, :args => "2>&1").should include("finalizer run\n")
end
ruby_version_is "3.0" do
it "warns if the finalizer has the object as the receiver" do
code = <<-RUBY
class CapturesSelf
def initialize
ObjectSpace.define_finalizer(self, proc {
puts "finalizer run"
})
end
end
CapturesSelf.new
exit 0
RUBY
ruby_exe(code, :args => "2>&1").should include("warning: finalizer references object to be finalized\n")
end
it "warns if the finalizer is a method bound to the receiver" do
code = <<-RUBY
class CapturesSelf
def initialize
ObjectSpace.define_finalizer(self, method(:finalize))
end
def finalize(id)
puts "finalizer run"
end
end
CapturesSelf.new
exit 0
RUBY
ruby_exe(code, :args => "2>&1").should include("warning: finalizer references object to be finalized\n")
end
it "warns if the finalizer was a block in the receiver" do
code = <<-RUBY
class CapturesSelf
def initialize
ObjectSpace.define_finalizer(self) do
puts "finalizer run"
end
end
end
CapturesSelf.new
exit 0
RUBY
ruby_exe(code, :args => "2>&1").should include("warning: finalizer references object to be finalized\n")
end
end
it "calls a finalizer at exit even if it is self-referencing" do
code = <<-RUBY
obj = "Test"
handler = Proc.new { puts "finalizer run" }
ObjectSpace.define_finalizer(obj, handler)
exit 0
RUBY
ruby_exe(code).should include("finalizer run\n")
end
it "calls a finalizer at exit even if it is indirectly self-referencing" do
code = <<-RUBY
class CapturesSelf
def initialize
ObjectSpace.define_finalizer(self, finalizer(self))
end
def finalizer(zelf)
proc do
puts "finalizer run"
end
end
end
CapturesSelf.new
exit 0
RUBY
ruby_exe(code, :args => "2>&1").should include("finalizer run\n")
end
it "calls a finalizer defined in a finalizer running at exit" do
code = <<-RUBY
obj = "Test"
handler = Proc.new do
obj2 = "Test"
handler2 = Proc.new { puts "finalizer 2 run" }
ObjectSpace.define_finalizer(obj2, handler2)
exit 0
end
ObjectSpace.define_finalizer(obj, handler)
exit 0
RUBY
ruby_exe(code, :args => "2>&1").should include("finalizer 2 run\n")
end
it "allows multiple finalizers with different 'callables' to be defined" do
code = <<-RUBY
obj = Object.new
ObjectSpace.define_finalizer(obj, Proc.new { STDOUT.write "finalized1\n" })
ObjectSpace.define_finalizer(obj, Proc.new { STDOUT.write "finalized2\n" })
exit 0
RUBY
ruby_exe(code).lines.sort.should == ["finalized1\n", "finalized2\n"]
end
ruby_version_is "3.1" do
describe "when $VERBOSE is not nil" do
it "warns if an exception is raised in finalizer" do
code = <<-RUBY
ObjectSpace.define_finalizer(Object.new) { raise "finalizing" }
RUBY
ruby_exe(code, args: "2>&1").should include("warning: Exception in finalizer", "finalizing")
end
end
describe "when $VERBOSE is nil" do
it "does not warn even if an exception is raised in finalizer" do
code = <<-RUBY
ObjectSpace.define_finalizer(Object.new) { raise "finalizing" }
RUBY
ruby_exe(code, args: "2>&1", options: "-W0").should == ""
end
end
end
end
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