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require_relative '../../spec_helper'
require 'objspace'
describe "ObjectSpace.trace_object_allocations" do
def has_class_frame?
Class.new {
attr_reader :c
def initialize
@c = caller_locations.first.label =~ /new/
end
}.new.c
end
def obj_class_path
has_class_frame? ? "Class" : nil
end
it "runs a block" do
ScratchPad.clear
ObjectSpace.trace_object_allocations do
ScratchPad.record :a
end
ScratchPad.recorded.should == :a
end
it "records info for allocation_class_path" do
ObjectSpace.trace_object_allocations do
o = Object.new
ObjectSpace.allocation_class_path(o).should == obj_class_path
a = [1, 2, 3]
ObjectSpace.allocation_class_path(a).should == nil
end
end
it "records info for allocation_generation" do
ObjectSpace.trace_object_allocations do
o = Object.new
ObjectSpace.allocation_generation(o).should.kind_of?(Integer)
a = [1, 2, 3]
ObjectSpace.allocation_generation(a).should.kind_of?(Integer)
end
end
it "records info for allocation_method_id" do
ObjectSpace.trace_object_allocations do
o = Object.new
ObjectSpace.allocation_method_id(o).should == (has_class_frame? ? :new : nil)
a = [1, 2, 3]
ObjectSpace.allocation_method_id(a).should == nil
end
end
it "records info for allocation_sourcefile" do
ObjectSpace.trace_object_allocations do
o = Object.new
ObjectSpace.allocation_sourcefile(o).should == __FILE__
a = [1, 2, 3]
ObjectSpace.allocation_sourcefile(a).should == __FILE__
end
end
it "records info for allocation_sourceline" do
ObjectSpace.trace_object_allocations do
o = Object.new
ObjectSpace.allocation_sourceline(o).should == __LINE__ - 1
a = [1, 2, 3]
ObjectSpace.allocation_sourceline(a).should == __LINE__ - 1
end
end
it "can be cleared using trace_object_allocations_clear" do
ObjectSpace.trace_object_allocations do
o = Object.new
ObjectSpace.allocation_class_path(o).should == obj_class_path
ObjectSpace.trace_object_allocations_clear
ObjectSpace.allocation_class_path(o).should be_nil
end
end
it "does not clears allocation data after returning" do
o = nil
ObjectSpace.trace_object_allocations do
o = Object.new
end
ObjectSpace.allocation_class_path(o).should == obj_class_path
end
it "can be used without a block using trace_object_allocations_start and _stop" do
ObjectSpace.trace_object_allocations_start
begin
o = Object.new
ObjectSpace.allocation_class_path(o).should == obj_class_path
a = [1, 2, 3]
ObjectSpace.allocation_class_path(a).should == nil
ensure
ObjectSpace.trace_object_allocations_stop
end
end
it "does not clears allocation data after trace_object_allocations_stop" do
ObjectSpace.trace_object_allocations_start
begin
o = Object.new
ensure
ObjectSpace.trace_object_allocations_stop
end
ObjectSpace.allocation_class_path(o).should == obj_class_path
end
it "can be nested" do
ObjectSpace.trace_object_allocations do
ObjectSpace.trace_object_allocations do
o = Object.new
ObjectSpace.allocation_class_path(o).should == obj_class_path
end
end
end
it "can be nested without a block using trace_object_allocations_start and _stop" do
ObjectSpace.trace_object_allocations_start
begin
ObjectSpace.trace_object_allocations_start
begin
o = Object.new
ObjectSpace.allocation_class_path(o).should == obj_class_path
ensure
ObjectSpace.trace_object_allocations_stop
end
ensure
ObjectSpace.trace_object_allocations_stop
end
end
it "can be nested with more _stop than _start" do
ObjectSpace.trace_object_allocations_start
begin
o = Object.new
ObjectSpace.allocation_class_path(o).should == obj_class_path
ObjectSpace.trace_object_allocations_stop
ensure
ObjectSpace.trace_object_allocations_stop
end
end
it "returns nil for class_path, generation, method_id, sourcefile, and sourceline for immutable objects" do
ObjectSpace.trace_object_allocations_start
begin
one = nil
two = 42
three = :foo
[one, two, three].each do |i|
ObjectSpace.allocation_class_path(i).should == nil
ObjectSpace.allocation_generation(i).should == nil
ObjectSpace.allocation_method_id(i).should == nil
ObjectSpace.allocation_sourcefile(i).should == nil
ObjectSpace.allocation_sourceline(i).should == nil
end
ensure
ObjectSpace.trace_object_allocations_stop
end
end
end
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