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diff --git a/jni/ruby/lib/profiler.rb b/jni/ruby/lib/profiler.rb
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+# Profile provides a way to Profile your Ruby application.
+#
+# Profiling your program is a way of determining which methods are called and
+# how long each method takes to complete.  This way you can detect which
+# methods are possible bottlenecks.
+#
+# Profiling your program will slow down your execution time considerably,
+# so activate it only when you need it.  Don't confuse benchmarking with
+# profiling.
+#
+# There are two ways to activate Profiling:
+#
+# == Command line
+#
+# Run your Ruby script with <code>-rprofile</code>:
+#
+#   ruby -rprofile example.rb
+#
+# If you're profiling an executable in your <code>$PATH</code> you can use
+# <code>ruby -S</code>:
+#
+#   ruby -rprofile -S some_executable
+#
+# == From code
+#
+# Just require 'profile':
+#
+#   require 'profile'
+#
+#   def slow_method
+#     5000.times do
+#       9999999999999999*999999999
+#     end
+#   end
+#
+#   def fast_method
+#     5000.times do
+#       9999999999999999+999999999
+#     end
+#   end
+#
+#   slow_method
+#   fast_method
+#
+# The output in both cases is a report when the execution is over:
+#
+#   ruby -rprofile example.rb
+#
+#     %   cumulative   self              self     total
+#    time   seconds   seconds    calls  ms/call  ms/call  name
+#    68.42     0.13      0.13        2    65.00    95.00  Integer#times
+#    15.79     0.16      0.03     5000     0.01     0.01  Fixnum#*
+#    15.79     0.19      0.03     5000     0.01     0.01  Fixnum#+
+#     0.00     0.19      0.00        2     0.00     0.00  IO#set_encoding
+#     0.00     0.19      0.00        1     0.00   100.00  Object#slow_method
+#     0.00     0.19      0.00        2     0.00     0.00  Module#method_added
+#     0.00     0.19      0.00        1     0.00    90.00  Object#fast_method
+#     0.00     0.19      0.00        1     0.00   190.00  #toplevel
+
+module Profiler__
+  class Wrapper < Struct.new(:defined_class, :method_id, :hash) # :nodoc:
+    private :defined_class=, :method_id=, :hash=
+
+    def initialize(klass, mid)
+      super(klass, mid, nil)
+      self.hash = Struct.instance_method(:hash).bind(self).call
+    end
+
+    def to_s
+      "#{defined_class.inspect}#".sub(/\A\#<Class:(.*)>#\z/, '\1.') << method_id.to_s
+    end
+    alias inspect to_s
+  end
+
+  # internal values
+  @@start = nil # the start time that profiling began
+  @@stacks = nil # the map of stacks keyed by thread
+  @@maps = nil # the map of call data keyed by thread, class and id. Call data contains the call count, total time,
+  PROFILE_CALL_PROC = TracePoint.new(*%i[call c_call b_call]) {|tp| # :nodoc:
+    now = Process.times[0]
+    stack = (@@stacks[Thread.current] ||= [])
+    stack.push [now, 0.0]
+  }
+  PROFILE_RETURN_PROC = TracePoint.new(*%i[return c_return b_return]) {|tp| # :nodoc:
+    now = Process.times[0]
+    key = Wrapper.new(tp.defined_class, tp.method_id)
+    stack = (@@stacks[Thread.current] ||= [])
+    if tick = stack.pop
+      threadmap = (@@maps[Thread.current] ||= {})
+      data = (threadmap[key] ||= [0, 0.0, 0.0, key])
+      data[0] += 1
+      cost = now - tick[0]
+      data[1] += cost
+      data[2] += cost - tick[1]
+      stack[-1][1] += cost if stack[-1]
+    end
+  }
+module_function
+  # Starts the profiler.
+  #
+  # See Profiler__ for more information.
+  def start_profile
+    @@start = Process.times[0]
+    @@stacks = {}
+    @@maps = {}
+    PROFILE_CALL_PROC.enable
+    PROFILE_RETURN_PROC.enable
+  end
+  # Stops the profiler.
+  #
+  # See Profiler__ for more information.
+  def stop_profile
+    PROFILE_CALL_PROC.disable
+    PROFILE_RETURN_PROC.disable
+  end
+  # Outputs the results from the profiler.
+  #
+  # See Profiler__ for more information.
+  def print_profile(f)
+    stop_profile
+    total = Process.times[0] - @@start
+    if total == 0 then total = 0.01 end
+    totals = {}
+    @@maps.values.each do |threadmap|
+      threadmap.each do |key, data|
+        total_data = (totals[key] ||= [0, 0.0, 0.0, key])
+        total_data[0] += data[0]
+        total_data[1] += data[1]
+        total_data[2] += data[2]
+      end
+    end
+
+    # Maybe we should show a per thread output and a totals view?
+
+    data = totals.values
+    data = data.sort_by{|x| -x[2]}
+    sum = 0
+    f.printf "  %%   cumulative   self              self     total\n"
+    f.printf " time   seconds   seconds    calls  ms/call  ms/call  name\n"
+    for d in data
+      sum += d[2]
+      f.printf "%6.2f %8.2f  %8.2f %8d ", d[2]/total*100, sum, d[2], d[0]
+      f.printf "%8.2f %8.2f  %s\n", d[2]*1000/d[0], d[1]*1000/d[0], d[3]
+    end
+    f.printf "%6.2f %8.2f  %8.2f %8d ", 0.0, total, 0.0, 1     # ???
+    f.printf "%8.2f %8.2f  %s\n", 0.0, total*1000, "#toplevel" # ???
+  end
+end