Created
March 25, 2014 19:37
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Ruby, trace, set_trace_func
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RubyVM::InstructionSequence.compile_option = { | |
trace_instruction: false | |
# This disables the `trace` VM instruction | |
} | |
count = lambda do | |
@count ||= 0 | |
@count += 1 | |
end | |
set_trace_func proc { |event, _, _, id, _, _| | |
if id == :to_s && event == "c-call" | |
count.call | |
end | |
} | |
at_exit do | |
puts "The method Fixnum#to_s was called #{@count} times" | |
end |
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ruby -r ./rb_trace_func.rb test.rb |
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100_000.times { |num| num.to_s } |
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FWIW, if I run the
test/ruby/test_settracefunc.rb
with the:trace_instruction
set to false, it throws a bunch of errors mostly relating to some events that weren't generated. For example,line
,c-return
, andreturn
don't get generated butc-call
gets generated!