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95 lines
3.1 KiB
95 lines
3.1 KiB
# 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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