ZJIT.stats_string

# File tmp/rubies/ruby-4.0.0/zjit.rb, line 167
def stats_string
  buf = +"***ZJIT: Printing ZJIT statistics on exit***\n"
  stats = self.stats

  if stats[:guard_type_count].nonzero?
    stats[:guard_type_exit_ratio] = stats[:exit_guard_type_failure].to_f / stats[:guard_type_count] * 100
  end
  if stats[:guard_shape_count].nonzero?
    stats[:guard_shape_exit_ratio] = stats[:exit_guard_shape_failure].to_f / stats[:guard_shape_count] * 100
  end

  # Show counters independent from exit_* or dynamic_send_*
  print_counters_with_prefix(prefix: 'not_inlined_cfuncs_', prompt: 'not inlined C methods', buf:, stats:, limit: 20)
  print_counters_with_prefix(prefix: 'ccall_', prompt: 'calls to C functions from JIT code', buf:, stats:, limit: 20)
  # Don't show not_annotated_cfuncs right now because it mostly duplicates not_inlined_cfuncs
  # print_counters_with_prefix(prefix: 'not_annotated_cfuncs_', prompt: 'not annotated C methods', buf:, stats:, limit: 20)

  # Show fallback counters, ordered by the typical amount of fallbacks for the prefix at the time
  print_counters_with_prefix(prefix: 'unspecialized_send_def_type_', prompt: 'not optimized method types for send', buf:, stats:, limit: 20)
  print_counters_with_prefix(prefix: 'unspecialized_send_without_block_def_type_', prompt: 'not optimized method types for send_without_block', buf:, stats:, limit: 20)
  print_counters_with_prefix(prefix: 'uncategorized_fallback_yarv_insn_', prompt: 'instructions with uncategorized fallback reason', buf:, stats:, limit: 20)
  print_counters_with_prefix(prefix: 'send_fallback_', prompt: 'send fallback reasons', buf:, stats:, limit: 20)
  print_counters_with_prefix(prefix: 'setivar_fallback_', prompt: 'setivar fallback reasons', buf:, stats:, limit: 5)
  print_counters_with_prefix(prefix: 'getivar_fallback_', prompt: 'getivar fallback reasons', buf:, stats:, limit: 5)
  print_counters_with_prefix(prefix: 'definedivar_fallback_', prompt: 'definedivar fallback reasons', buf:, stats:, limit: 5)
  print_counters_with_prefix(prefix: 'invokeblock_handler_', prompt: 'invokeblock handler', buf:, stats:, limit: 10)

  # Show most popular unsupported call features. Because each call can
  # use multiple complex features, a decrease in this number does not
  # necessarily mean an increase in number of optimized calls.
  print_counters_with_prefix(prefix: 'complex_arg_pass_', prompt: 'popular complex argument-parameter features not optimized', buf:, stats:, limit: 10)

  # Show exit counters, ordered by the typical amount of exits for the prefix at the time
  print_counters_with_prefix(prefix: 'compile_error_', prompt: 'compile error reasons', buf:, stats:, limit: 20)
  print_counters_with_prefix(prefix: 'unhandled_yarv_insn_', prompt: 'unhandled YARV insns', buf:, stats:, limit: 20)
  print_counters_with_prefix(prefix: 'unhandled_hir_insn_', prompt: 'unhandled HIR insns', buf:, stats:, limit: 20)
  print_counters_with_prefix(prefix: 'exit_', prompt: 'side exit reasons', buf:, stats:, limit: 20)

  # Show no-prefix counters, having the most important stat `ratio_in_zjit` at the end
  print_counters([
    :send_count,
    :dynamic_send_count,
    :optimized_send_count,
    :dynamic_setivar_count,
    :dynamic_getivar_count,
    :dynamic_definedivar_count,
    :iseq_optimized_send_count,
    :inline_cfunc_optimized_send_count,
    :inline_iseq_optimized_send_count,
    :non_variadic_cfunc_optimized_send_count,
    :variadic_cfunc_optimized_send_count,
  ], buf:, stats:, right_align: true, base: :send_count)
  print_counters([
    :compiled_iseq_count,
    :failed_iseq_count,

    :compile_time_ns,
    :profile_time_ns,
    :gc_time_ns,
    :invalidation_time_ns,

    :vm_write_pc_count,
    :vm_write_sp_count,
    :vm_write_locals_count,
    :vm_write_stack_count,
    :vm_write_to_parent_iseq_local_count,
    :vm_read_from_parent_iseq_local_count,

    :guard_type_count,
    :guard_type_exit_ratio,
    :guard_shape_count,
    :guard_shape_exit_ratio,

    :code_region_bytes,
    :zjit_alloc_bytes,
    :total_mem_bytes,

    :side_exit_count,
    :total_insn_count,
    :vm_insn_count,
    :zjit_insn_count,
    :ratio_in_zjit,
  ], buf:, stats:)

  buf
end