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# frozen_string_literal: false
require 'test/unit'
# These test the functionality of object shapes
class TestShapes < Test::Unit::TestCase
class Example
def initialize
@a = 1
end
end
class RemoveAndAdd
def add_foo
@foo = 1
end
def remove
remove_instance_variable(:@foo)
end
def add_bar
@bar = 1
end
end
# RubyVM.debug_shape returns new instances of shape objects for
# each call. This helper method allows us to define equality for
# shapes
def assert_shape_equal(shape1, shape2)
assert_equal(shape1.id, shape2.id)
assert_equal(shape1.parent_id, shape2.parent_id)
assert_equal(shape1.depth, shape2.depth)
assert_equal(shape1.type, shape2.type)
end
def refute_shape_equal(shape1, shape2)
refute_equal(shape1.id, shape2.id)
end
def test_iv_index
example = RemoveAndAdd.new
shape = RubyVM.debug_shape(example)
assert_equal 0, shape.iv_count
example.add_foo # makes a transition
new_shape = RubyVM.debug_shape(example)
assert_equal([:@foo], example.instance_variables)
assert_equal(shape.id, new_shape.parent.id)
assert_equal(1, new_shape.iv_count)
example.remove # makes a transition
remove_shape = RubyVM.debug_shape(example)
assert_equal([], example.instance_variables)
assert_equal(new_shape.id, remove_shape.parent.id)
assert_equal(1, remove_shape.iv_count)
example.add_bar # makes a transition
bar_shape = RubyVM.debug_shape(example)
assert_equal([:@bar], example.instance_variables)
assert_equal(remove_shape.id, bar_shape.parent.id)
assert_equal(2, bar_shape.iv_count)
end
def test_new_obj_has_root_shape
assert_shape_equal(RubyVM.debug_root_shape, RubyVM.debug_shape(Object.new))
end
def test_frozen_new_obj_has_frozen_root_shape
assert_shape_equal(
RubyVM.debug_frozen_root_shape,
RubyVM.debug_shape(Object.new.freeze)
)
end
def test_str_has_root_shape
assert_shape_equal(RubyVM.debug_root_shape, RubyVM.debug_shape(""))
end
def test_array_has_root_shape
assert_shape_equal(RubyVM.debug_root_shape, RubyVM.debug_shape([]))
end
def test_hash_has_root_shape
assert_shape_equal(RubyVM.debug_root_shape, RubyVM.debug_shape({}))
end
def test_true_has_frozen_root_shape
assert_shape_equal(RubyVM.debug_frozen_root_shape, RubyVM.debug_shape(true))
end
def test_nil_has_frozen_root_shape
assert_shape_equal(RubyVM.debug_frozen_root_shape, RubyVM.debug_shape(nil))
end
def test_basic_shape_transition
obj = Example.new
refute_equal(RubyVM.debug_root_shape, RubyVM.debug_shape(obj))
assert_shape_equal(RubyVM.debug_root_shape.edges[:@a], RubyVM.debug_shape(obj))
assert_equal(obj.instance_variable_get(:@a), 1)
end
def test_different_objects_make_same_transition
obj = Example.new
obj2 = ""
obj2.instance_variable_set(:@a, 1)
assert_shape_equal(RubyVM.debug_shape(obj), RubyVM.debug_shape(obj2))
end
def test_duplicating_objects
obj = Example.new
obj2 = obj.dup
assert_shape_equal(RubyVM.debug_shape(obj), RubyVM.debug_shape(obj2))
end
def test_freezing_and_duplicating_object
obj = Object.new.freeze
obj2 = obj.dup
refute_predicate(obj2, :frozen?)
# dup'd objects shouldn't be frozen, and the shape should be the
# parent shape of the copied object
assert_equal(RubyVM.debug_shape(obj).parent.id, RubyVM.debug_shape(obj2).id)
end
def test_freezing_and_duplicating_object_with_ivars
obj = Example.new.freeze
obj2 = obj.dup
refute_predicate(obj2, :frozen?)
refute_shape_equal(RubyVM.debug_shape(obj), RubyVM.debug_shape(obj2))
assert_equal(obj2.instance_variable_get(:@a), 1)
end
def test_freezing_and_duplicating_string_with_ivars
str = "str"
str.instance_variable_set(:@a, 1)
str.freeze
str2 = str.dup
refute_predicate(str2, :frozen?)
refute_equal(RubyVM.debug_shape(str).id, RubyVM.debug_shape(str2).id)
assert_equal(str2.instance_variable_get(:@a), 1)
end
def test_freezing_and_cloning_objects
obj = Object.new.freeze
obj2 = obj.clone(freeze: true)
assert_predicate(obj2, :frozen?)
assert_shape_equal(RubyVM.debug_shape(obj), RubyVM.debug_shape(obj2))
end
def test_freezing_and_cloning_object_with_ivars
obj = Example.new.freeze
obj2 = obj.clone(freeze: true)
assert_predicate(obj2, :frozen?)
assert_shape_equal(RubyVM.debug_shape(obj), RubyVM.debug_shape(obj2))
assert_equal(obj2.instance_variable_get(:@a), 1)
end
def test_freezing_and_cloning_string
str = "str".freeze
str2 = str.clone(freeze: true)
assert_predicate(str2, :frozen?)
assert_shape_equal(RubyVM.debug_shape(str), RubyVM.debug_shape(str2))
end
def test_freezing_and_cloning_string_with_ivars
str = "str"
str.instance_variable_set(:@a, 1)
str.freeze
str2 = str.clone(freeze: true)
assert_predicate(str2, :frozen?)
assert_shape_equal(RubyVM.debug_shape(str), RubyVM.debug_shape(str2))
assert_equal(str2.instance_variable_get(:@a), 1)
end
end
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