module YJIT def self.disasm(iseq) iseq = RubyVM::InstructionSequence.of(iseq) blocks = YJIT.blocks_for(iseq) return if blocks.empty? str = "" cs = YJIT::Disasm.new str << iseq.disasm str << "\n" # Sort the blocks by increasing addresses blocks.sort_by(&:address).each_with_index do |block, i| str << "== BLOCK #{i+1}/#{blocks.length}: #{block.code.length} BYTES, ISEQ RANGE [#{block.iseq_start_index},#{block.iseq_end_index}) ".ljust(80, "=") str << "\n" cs.disasm(block.code, block.address).each do |i| str << sprintf( " %
08x: %s\t%
s\n", address: i.address, instruction: i.mnemonic, details: i.op_str ) end end block_sizes = blocks.map { |block| block.code.length } total_bytes = block_sizes.reduce(0, :+) str << "\n" str << "Total code size: #{total_bytes} bytes" str << "\n" str end if defined?(Disasm) # Return a hash for statistics generated for the --yjit-stats command line option. # Return nil when option is not passed or unavailable. def self.runtime_stats # defined in yjit_iface.c Primitive.get_stat_counters end # Discard statistics collected for --yjit-stats. def self.reset_stats! # defined in yjit_iface.c Primitive.reset_stats_bang end class << self private # Format and print out counters def _print_stats counters = runtime_stats return unless counters $stderr.puts("***YJIT: Printing runtime counters from yjit.rb***") print_counters(counters, prefix: 'oswb_', prompt: 'opt_send_without_block exit reasons: ') print_counters(counters, prefix: 'leave_', prompt: 'leave exit reasons: ') print_counters(counters, prefix: 'getivar_', prompt: 'getinstancevariable exit reasons:') print_counters(counters, prefix: 'oaref_', prompt: 'opt_aref exit reasons: ') end def print_counters(counters, prefix:, prompt:) $stderr.puts(prompt) counters = counters.filter { |key, _| key.start_with?(prefix) } counters.filter! { |_, value| value != 0 } counters.transform_keys! { |key| key.to_s.delete_prefix(prefix) } if counters.empty? $stderr.puts(" (all relevant counters are zero)") return end counters = counters.to_a counters.sort_by! { |(_, counter_value)| counter_value } longest_name_length = counters.max_by { |(name, _)| name.length }.first.length total = counters.sum { |(_, counter_value)| counter_value } counters.reverse_each do |(name, value)| percentage = value.fdiv(total) * 100 $stderr.printf(" %*s %10d (%4.1f%%)\n", longest_name_length, name, value, percentage); end end end end