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# frozen_string_literal: true
# This module allows for introspection of YJIT, CRuby's experimental in-process
# just-in-time compiler. This module exists only to help develop YJIT, as such,
# everything in the module is highly implementation specific and comes with no
# API stability guarantee whatsoever.
#
# This module may not exist if YJIT does not support the particular platform
# for which CRuby is built. There is also no API stability guarantee as to in
# what situations this module is defined.
module RubyVM::YJIT
# Check if YJIT is enabled
def self.enabled?
Primitive.cexpr! 'RBOOL(rb_yjit_enabled_p())'
end
def self.stats_enabled?
Primitive.rb_yjit_stats_enabled_p
end
# Discard statistics collected for --yjit-stats.
def self.reset_stats!
Primitive.rb_yjit_reset_stats_bang
end
# 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
Primitive.rb_yjit_get_stats
end
# Produce disassembly for an iseq
def self.disasm(iseq)
# If a method or proc is passed in, get its iseq
iseq = RubyVM::InstructionSequence.of(iseq)
if self.enabled?
# Produce the disassembly string
# Include the YARV iseq disasm in the string for additional context
iseq.disasm + "\n" + Primitive.rb_yjit_disasm_iseq(iseq)
else
iseq.disasm
end
end
# Produce a list of instructions compiled by YJIT for an iseq
def self.insns_compiled(iseq)
# If a method or proc is passed in, get its iseq
iseq = RubyVM::InstructionSequence.of(iseq)
if self.enabled?
Primitive.rb_yjit_insns_compiled(iseq)
else
Qnil
end
end
def self.simulate_oom!
Primitive.rb_yjit_simulate_oom_bang
end
# Avoid calling a method here to not interfere with compilation tests
if Primitive.rb_yjit_stats_enabled_p
at_exit { _print_stats }
end
class << self
private
# Format and print out counters
def _print_stats
stats = runtime_stats
return unless stats
$stderr.puts("***YJIT: Printing YJIT statistics on exit***")
print_counters(stats, prefix: 'send_', prompt: 'method call exit reasons: ')
print_counters(stats, prefix: 'invokesuper_', prompt: 'invokesuper exit reasons: ')
print_counters(stats, prefix: 'leave_', prompt: 'leave exit reasons: ')
print_counters(stats, prefix: 'gbpp_', prompt: 'getblockparamproxy exit reasons: ')
print_counters(stats, prefix: 'getivar_', prompt: 'getinstancevariable exit reasons:')
print_counters(stats, prefix: 'setivar_', prompt: 'setinstancevariable exit reasons:')
print_counters(stats, prefix: 'oaref_', prompt: 'opt_aref exit reasons: ')
print_counters(stats, prefix: 'expandarray_', prompt: 'expandarray exit reasons: ')
print_counters(stats, prefix: 'opt_getinlinecache_', prompt: 'opt_getinlinecache exit reasons: ')
print_counters(stats, prefix: 'invalidate_', prompt: 'invalidation reasons: ')
side_exits = total_exit_count(stats)
total_exits = side_exits + stats[:leave_interp_return]
# Number of instructions that finish executing in YJIT.
# See :count-placement: about the subtraction.
retired_in_yjit = stats[:exec_instruction] - side_exits
# Average length of instruction sequences executed by YJIT
avg_len_in_yjit = retired_in_yjit.to_f / total_exits
# Proportion of instructions that retire in YJIT
total_insns_count = retired_in_yjit + stats[:vm_insns_count]
yjit_ratio_pct = 100.0 * retired_in_yjit.to_f / total_insns_count
# Number of failed compiler invocations
compilation_failure = stats[:compilation_failure]
$stderr.puts "bindings_allocations: " + ("%10d" % stats[:binding_allocations])
$stderr.puts "bindings_set: " + ("%10d" % stats[:binding_set])
$stderr.puts "compilation_failure: " + ("%10d" % compilation_failure) if compilation_failure != 0
$stderr.puts "compiled_iseq_count: " + ("%10d" % stats[:compiled_iseq_count])
$stderr.puts "compiled_block_count: " + ("%10d" % stats[:compiled_block_count])
$stderr.puts "invalidation_count: " + ("%10d" % stats[:invalidation_count])
$stderr.puts "constant_state_bumps: " + ("%10d" % stats[:constant_state_bumps])
$stderr.puts "inline_code_size: " + ("%10d" % stats[:inline_code_size])
$stderr.puts "outlined_code_size: " + ("%10d" % stats[:outlined_code_size])
$stderr.puts "total_exit_count: " + ("%10d" % total_exits)
$stderr.puts "total_insns_count: " + ("%10d" % total_insns_count)
$stderr.puts "vm_insns_count: " + ("%10d" % stats[:vm_insns_count])
$stderr.puts "yjit_insns_count: " + ("%10d" % stats[:exec_instruction])
$stderr.puts "ratio_in_yjit: " + ("%9.1f" % yjit_ratio_pct) + "%"
$stderr.puts "avg_len_in_yjit: " + ("%10.1f" % avg_len_in_yjit)
print_sorted_exit_counts(stats, prefix: "exit_")
end
def print_sorted_exit_counts(stats, prefix:, how_many: 20, left_pad: 4)
exits = []
stats.each do |k, v|
if k.start_with?(prefix)
exits.push [k.to_s.delete_prefix(prefix), v]
end
end
exits = exits.sort_by { |name, count| -count }[0...how_many]
total_exits = total_exit_count(stats)
top_n_total = exits.map { |name, count| count }.sum
top_n_exit_pct = 100.0 * top_n_total / total_exits
$stderr.puts "Top-#{how_many} most frequent exit ops (#{"%.1f" % top_n_exit_pct}% of exits):"
longest_insn_name_len = exits.map { |name, count| name.length }.max
exits.each do |name, count|
padding = longest_insn_name_len + left_pad
padded_name = "%#{padding}s" % name
padded_count = "%10d" % count
percent = 100.0 * count / total_exits
formatted_percent = "%.1f" % percent
$stderr.puts("#{padded_name}: #{padded_count} (#{formatted_percent}%)" )
end
end
def total_exit_count(stats, prefix: "exit_")
total = 0
stats.each do |k,v|
total += v if k.start_with?(prefix)
end
total
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
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