From: Reginald Tan <lists@...>
Date: 2012-07-03T10:11:11+09:00
Subject: Using binding + set_trace_func to capture execution state

Hi guys, I'm interested in building a program that will display the
callgraph trace of a program and at the same time will allow you to
inspect the variables in your program *after* the execution has ended
(diff from using debugger to halt execution and inspecting the state).

Initially I thought I could use set_trace_func and store the binding in
a table and just retrieve that binding later on to evaluate the
resulting expression of my target variable, but it's not behaving as I
expected. In the code provided below, I thought running it would output
"1 3 5", but I get "5 5 5" instead.

What am I missing here? Is there another way to go about what I'm trying
to do? Thanks!


binding_table = {}

def hello
  x = 1
  x = 3
  x = 5
end

set_trace_func proc { |event, file, line, id, binding, classname|
  if event == "line"
    binding_table[line] = binding
  end
}

hello

set_trace_func nil

puts eval("x", binding_table[4])
puts eval("x", binding_table[5])
puts eval("x", binding_table[6])

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