Make benchmarks/optcarrot/benchmark.rb compatible with the Ractor harness

* Without needing a copy of the benchmark files.

Author: eregon

benchmarks.yml

@@ -85,6 +85,7 @@ nqueens:
   ractor: true
 optcarrot:
   desc: optcarrot is a functional headless NES emulator, run on a specific game cartridge for a specific number of frames.
+  ractor: true
 protoboeuf:
   desc: protoboeuf (pure-Ruby protobuf) message decoding
   ractor: true

benchmarks/optcarrot/benchmark.rb

@@ -1,10 +1,46 @@
 require_relative '../../harness/loader'
 require_relative "lib/optcarrot"
 
-rom_path = File.join(__dir__, "examples/Lan_Master.nes")
-nes = Optcarrot::NES.new(["--headless", rom_path])
-nes.reset
+if ENV["YJIT_BENCH_RACTOR_HARNESS"]
+  # Based on bin/optcarrot-bench-parallel-on-ractor
+  [
+    Optcarrot::Config::DEFAULT_OPTIONS,
+    Optcarrot::Config::OPTIONS,
+    Optcarrot::Driver::DRIVER_DB,
+    Optcarrot::Audio::PACK_FORMAT,
+    Optcarrot::APU::Pulse::WAVE_FORM,
+    Optcarrot::APU::Triangle::WAVE_FORM,
+    Optcarrot::APU::FRAME_CLOCKS,
+    Optcarrot::APU::OSCILLATOR_CLOCKS,
+    Optcarrot::APU::LengthCounter::LUT,
+    Optcarrot::APU::Noise::LUT,
+    Optcarrot::APU::Noise::NEXT_BITS_1,
+    Optcarrot::APU::Noise::NEXT_BITS_6,
+    Optcarrot::APU::DMC::LUT,
+    Optcarrot::PPU::DUMMY_FRAME,
+    Optcarrot::PPU::BOOT_FRAME,
+    Optcarrot::PPU::SP_PIXEL_POSITIONS,
+    Optcarrot::PPU::TILE_LUT,
+    Optcarrot::PPU::NMT_TABLE,
+    Optcarrot::CPU::DISPATCH,
+    Optcarrot::ROM::MAPPER_DB,
+  ].each { |const| Ractor.make_shareable(const) }
 
-run_benchmark(10) do
-  200.times { nes.step }
+  ROM_PATH = File.join(__dir__, "examples/Lan_Master.nes").freeze
+  ENV["WARMUP_ITRS"] = "1"
+
+  run_benchmark(10) do
+    nes = Optcarrot::NES.new(["-b", "--no-print-video-checksum", ROM_PATH])
+    nes.reset
+
+    200.times { nes.step }
+  end
+else
+  rom_path = File.join(__dir__, "examples/Lan_Master.nes")
+  nes = Optcarrot::NES.new(["--headless", rom_path])
+  nes.reset
+
+  run_benchmark(10) do
+    200.times { nes.step }
+  end
 end