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import os |
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import statistics |
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import sys |
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import time |
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sys.path.extend(['.', '..']) |
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from pycparser import c_parser, c_ast |
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def measure_parse(text, n, progress_cb): |
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"""Measure the parsing of text with pycparser. |
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text should represent a full file. n is the number of iterations to measure. |
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progress_cb will be called with the iteration number each time one is done. |
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Returns a list of elapsed times, one per iteration. |
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""" |
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times = [] |
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for i in range(n): |
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parser = c_parser.CParser() |
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t1 = time.time() |
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ast = parser.parse(text, '') |
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elapsed = time.time() - t1 |
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assert isinstance(ast, c_ast.FileAST) |
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times.append(elapsed) |
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progress_cb(i) |
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return times |
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def measure_file(filename, n): |
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progress_cb = lambda i: print('.', sep='', end='', flush=True) |
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with open(filename) as f: |
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print('%-25s' % os.path.basename(filename), end='', flush=True) |
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text = f.read() |
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times = measure_parse(text, n, progress_cb) |
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print(' Mean: %.3f Stddev: %.3f' % (statistics.mean(times), |
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statistics.stdev(times))) |
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NUM_RUNS = 5 |
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if __name__ == '__main__': |
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if len(sys.argv) < 2: |
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print("Usage: %s <dir with input files>") |
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sys.exit(1) |
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for filename in os.listdir(sys.argv[1]): |
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filename = os.path.join(sys.argv[1], filename) |
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measure_file(filename, NUM_RUNS) |
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