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hibariya/hi.rb

Created August 30, 2016 03:41
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I never knew 'literal'.freeze is compiled in 1 instruction (not 2)
Raw
hi.rb
# 1 instruction
puts RubyVM::InstructionSequence.compile(%('hi')).disasm
# == disasm: #<ISeq:<compiled>@<compiled>>================================
# 0000 trace 1 ( 1)
# 0002 putstring "hi"
# 0004 leave
# 1 instruction
puts RubyVM::InstructionSequence.compile(%('hi'.freeze)).disasm
# == disasm: #<ISeq:<compiled>@<compiled>>================================
# 0000 trace 1 ( 1)
# 0002 opt_str_freeze "hi"
# 0004 leave
# 3 instructions
puts RubyVM::InstructionSequence.compile(%('hi'.itself.freeze)).disasm
# == disasm: #<ISeq:<compiled>@<compiled>>================================
# 0000 trace 1 ( 1)
# 0002 putstring "hi"
# 0004 opt_send_without_block <callinfo!mid:itself, argc:0, ARGS_SIMPLE>, <callcache>
# 0007 opt_send_without_block <callinfo!mid:freeze, argc:0, ARGS_SIMPLE>, <callcache>
# 0010 leave
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