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96 lines
3.1 KiB
96 lines
3.1 KiB
4 months ago
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# Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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"""Utility functions to explore the neighbor flags.
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Part of the Chrome build flags optimization.
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"""
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__author__ = 'yuhenglong@google.com (Yuheng Long)'
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import flags
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from flags import Flag
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def ClimbNext(flags_dict, climb_spec):
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"""Get the flags that are different from |flags_dict| by |climb_spec|.
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Given a set of flags, |flags_dict|, return a new set of flags that are
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adjacent along the flag spec |climb_spec|.
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An example flags_dict is {foo=[1-9]:foo=5, bar=[1-5]:bar=2} and climb_spec is
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bar=[1-5]. This method changes the flag that contains the spec bar=[1-5]. The
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results are its neighbors dictionaries, i.e., {foo=[1-9]:foo=5,
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bar=[1-5]:bar=1} and {foo=[1-9]:foo=5, bar=[1-5]:bar=3}.
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Args:
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flags_dict: The dictionary containing the original flags whose neighbors are
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to be explored.
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climb_spec: The spec in the flags_dict is to be changed. The spec is a
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definition in the little language, a string with escaped sequences of the
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form [<start>-<end>] where start and end is an positive integer for a
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fillable value. An example of a spec is "foo[0-9]".
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Returns:
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List of dictionaries of neighbor flags.
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"""
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# This method searches for a pattern [start-end] in the spec. If the spec
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# contains this pattern, it is a numeric flag. Otherwise it is a boolean flag.
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# For example, -finline-limit=[1-1000] is a numeric flag and -falign-jumps is
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# a boolean flag.
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numeric_flag_match = flags.Search(climb_spec)
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# If the flags do not contain the spec.
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if climb_spec not in flags_dict:
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results = flags_dict.copy()
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if numeric_flag_match:
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# Numeric flags.
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results[climb_spec] = Flag(climb_spec,
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int(numeric_flag_match.group('start')))
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else:
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# Boolean flags.
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results[climb_spec] = Flag(climb_spec)
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return [results]
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# The flags contain the spec.
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if not numeric_flag_match:
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# Boolean flags.
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results = flags_dict.copy()
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# Turn off the flag. A flag is turned off if it is not presented in the
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# flags_dict.
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del results[climb_spec]
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return [results]
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# Numeric flags.
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flag = flags_dict[climb_spec]
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# The value of the flag having spec.
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value = flag.GetValue()
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results = []
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if value + 1 < int(numeric_flag_match.group('end')):
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# If the value is not the end value, explore the value that is 1 larger than
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# the current value.
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neighbor = flags_dict.copy()
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neighbor[climb_spec] = Flag(climb_spec, value + 1)
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results.append(neighbor)
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if value > int(numeric_flag_match.group('start')):
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# If the value is not the start value, explore the value that is 1 lesser
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# than the current value.
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neighbor = flags_dict.copy()
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neighbor[climb_spec] = Flag(climb_spec, value - 1)
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results.append(neighbor)
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else:
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# Delete the value, i.e., turn off the flag. A flag is turned off if it is
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# not presented in the flags_dict.
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neighbor = flags_dict.copy()
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del neighbor[climb_spec]
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results.append(neighbor)
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return results
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