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# Authors: Andreas Sandberg
#          Andreas Hansson

import m5.objects
import inspect
import sys
from textwrap import  TextWrapper

# Dictionary of mapping names of real memory controller models to
# classes.
_mem_classes = {}

# Memory aliases. We make sure they exist before we add them to the
# fina; list. A target may be specified as a tuple, in which case the
# first available memory controller model in the tuple will be used.
_mem_aliases_all = [
    ("simple_mem", "SimpleMemory"),
    ("ddr3-1600", "SimpleDDR3"),
    ("lpddr2_s4-1066", "SimpleLPDDR2_S4"),
    ("wio-200", "SimpleWideIO"),
    ]

# Filtered list of aliases. Only aliases for existing memory
# controllers exist in this list.
_mem_aliases = {}


def is_mem_class(cls):
    """Determine if a class is a memory controller that can be instantiated"""

    # We can't use the normal inspect.isclass because the ParamFactory
    # and ProxyFactory classes have a tendency to confuse it.
    try:
        return issubclass(cls, m5.objects.AbstractMemory) and \
            not cls.abstract
    except TypeError:
        return False

def get(name):
    """Get a memory class from a user provided class name or alias."""

    real_name = _mem_aliases.get(name, name)

    try:
        mem_class = _mem_classes[real_name]
        return mem_class
    except KeyError:
        print "%s is not a valid memory controller." % (name,)
        sys.exit(1)

def print_mem_list():
    """Print a list of available memory classes including their aliases."""

    print "Available memory classes:"
    doc_wrapper = TextWrapper(initial_indent="\t\t", subsequent_indent="\t\t")
    for name, cls in _mem_classes.items():
        print "\t%s" % name

        # Try to extract the class documentation from the class help
        # string.
        doc = inspect.getdoc(cls)
        if doc:
            for line in doc_wrapper.wrap(doc):
                print line

    if _mem_aliases:
        print "\nMemory aliases:"
        for alias, target in _mem_aliases.items():
            print "\t%s => %s" % (alias, target)

def mem_names():
    """Return a list of valid memory names."""
    return _mem_classes.keys() + _mem_aliases.keys()

# Add all memory controllers in the object hierarchy.
for name, cls in inspect.getmembers(m5.objects, is_mem_class):
    _mem_classes[name] = cls

for alias, target in _mem_aliases_all:
    if isinstance(target, tuple):
        # Some aliases contain a list of memory controller models
        # sorted in priority order. Use the first target that's
        # available.
        for t in target:
            if t in _mem_classes:
                _mem_aliases[alias] = t
                break
    elif target in _mem_classes:
        # Normal alias
        _mem_aliases[alias] = target