1# Copyright (c) 2018 Metempsy Technology Consulting
2# All rights reserved.
3#
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15# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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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
33from __future__ import absolute_import
34
35from m5 import fatal
36import m5.objects
37import inspect
38import sys
39from textwrap import TextWrapper
40
41# Dictionary of mapping names of real branch predictor models to classes.
42_bp_classes = {}
43
44
45def is_bp_class(cls):
46    """Determine if a class is a branch predictor that can be instantiated"""
47
48    # We can't use the normal inspect.isclass because the ParamFactory
49    # and ProxyFactory classes have a tendency to confuse it.
50    try:
51        return issubclass(cls, m5.objects.BranchPredictor) and \
52            not cls.abstract
53    except (TypeError, AttributeError):
54        return False
55
56def get(name):
57    """Get a BP class from a user provided class name or alias."""
58
59    try:
60        bp_class = _bp_classes[name]
61        return bp_class
62    except KeyError:
63        print("%s is not a valid BP model." % (name,))
64        sys.exit(1)
65
66def print_bp_list():
67    """Print a list of available BP classes."""
68
69    print("Available BranchPredictor classes:")
70    doc_wrapper = TextWrapper(initial_indent="\t\t", subsequent_indent="\t\t")
71    for name, cls in _bp_classes.items():
72        print("\t%s" % name)
73
74        # Try to extract the class documentation from the class help
75        # string.
76        doc = inspect.getdoc(cls)
77        if doc:
78            for line in doc_wrapper.wrap(doc):
79                print(line)
80
81def bp_names():
82    """Return a list of valid Branch Predictor names."""
83    return list(_bp_classes.keys())
84
85# Add all BPs in the object hierarchy.
86for name, cls in inspect.getmembers(m5.objects, is_bp_class):
87    _bp_classes[name] = cls
88
89
90# The same for indirect branch predictors...
91# Dictionary of mapping names of real branch predictor models to classes.
92_indirect_bp_classes = {}
93
94
95def is_indirect_bp_class(cls):
96    """Determine if a class is an indirect branch predictor that can be
97    instantiated"""
98
99    # We can't use the normal inspect.isclass because the ParamFactory
100    # and ProxyFactory classes have a tendency to confuse it.
101    try:
102        return issubclass(cls, m5.objects.IndirectPredictor) and \
103            not cls.abstract
104    except (TypeError, AttributeError):
105        return False
106
107def get_indirect(name):
108    """Get an Indirect BP class from a user provided class name or alias."""
109
110    try:
111        indirect_bp_class = _indirect_bp_classes[name]
112        return indirect_bp_class
113    except KeyError:
114        print("%s is not a valid indirect BP model." % (name,))
115        sys.exit(1)
116
117def print_indirect_bp_list():
118    """Print a list of available indirect BP classes."""
119
120    print("Available Indirect BranchPredictor classes:")
121    doc_wrapper = TextWrapper(initial_indent="\t\t", subsequent_indent="\t\t")
122    for name, cls in _indirect_bp_classes.items():
123        print("\t%s" % name)
124
125        # Try to extract the class documentation from the class help
126        # string.
127        doc = inspect.getdoc(cls)
128        if doc:
129            for line in doc_wrapper.wrap(doc):
130                print(line)
131
132def indirect_bp_names():
133    """Return a list of valid Indirect Branch Predictor names."""
134    return _indirect_bp_classes.keys()
135
136# Add all indirect BPs in the object hierarchy.
137for name, cls in inspect.getmembers(m5.objects, is_indirect_bp_class):
138    _indirect_bp_classes[name] = cls
139
140