lab/branch_trace.py


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import sys

pairs = set()
last = -1

def trace(frame, event, arg):
    global last
    if event == "line":
        this = frame.f_lineno
        pairs.add((last, this))
        last = this
    return trace

code = open(sys.argv[1]).read()
sys.settrace(trace)
exec(code)
print(sorted(pairs))