BPConfig.py revision 13731 
1# Copyright (c) 2018 Metempsy Technology Consulting
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26#
27# Authors: Pau Cabre
28
29# This file is a copy of MemConfig.py / CpuConfig.py, but modified to
30# hanle branch predictors instead of memory controllers / CPUs
31
32from __future__ import print_function
33
34from m5 import fatal
35import m5.objects
36import inspect
37import sys
38from textwrap import TextWrapper
39
40# Dictionary of mapping names of real branch predictor models to classes.
41_bp_classes = {}
42
43
44def is_bp_class(cls):
45    """Determine if a class is a branch predictor that can be instantiated"""
46
47    # We can't use the normal inspect.isclass because the ParamFactory
48    # and ProxyFactory classes have a tendency to confuse it.
49    try:
50        return issubclass(cls, m5.objects.BranchPredictor) and \
51            not cls.abstract
52    except (TypeError, AttributeError):
53        return False
54
55def get(name):
56    """Get a BP class from a user provided class name or alias."""
57
58    try:
59        bp_class = _bp_classes[name]
60        return bp_class
61    except KeyError:
62        print("%s is not a valid BP model." % (name,))
63        sys.exit(1)
64
65def print_bp_list():
66    """Print a list of available BP classes."""
67
68    print("Available BranchPredictor classes:")
69    doc_wrapper = TextWrapper(initial_indent="\t\t", subsequent_indent="\t\t")
70    for name, cls in _bp_classes.items():
71        print("\t%s" % name)
72
73        # Try to extract the class documentation from the class help
74        # string.
75        doc = inspect.getdoc(cls)
76        if doc:
77            for line in doc_wrapper.wrap(doc):
78                print(line)
79
80def bp_names():
81    """Return a list of valid Branch Predictor names."""
82    return list(_bp_classes.keys())
83
84# Add all BPs in the object hierarchy.
85for name, cls in inspect.getmembers(m5.objects, is_bp_class):
86    _bp_classes[name] = cls
87
88