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gen/fhdl/namer: Improve class/variable names.

This commit is contained in:
Florent Kermarrec 2023-11-06 12:51:28 +01:00
parent 9548259a5c
commit 19a3ab2614
1 changed files with 70 additions and 70 deletions
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118
litex/gen/fhdl/namer.py
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@ -10,7 +10,7 @@ from migen.fhdl.structure import *
# Private Classes/Helpers --------------------------------------------------------------------------
class _Node:
class HierarchyNode:
"""A node in a hierarchy tree used for signal name resolution.
Attributes:
@ -27,18 +27,18 @@ class _Node:
self.use_number = False
self.children = {}
def _build_tree(signals, base_tree=None):
def build_hierarchy_tree(signals, base_tree=None):
"""
Constructs a hierarchical tree from signals, where each signal's backtrace contributes to the tree structure.
Parameters:
- signals (list): A list of signals to process.
- base_tree (Node, optional): A base tree to refine with number usage information.
- base_tree (HierarchyNode, optional): A base tree to refine with number usage information.
Returns:
- Node: The root node of the constructed tree.
- HierarchyNode: The root node of the constructed tree.
"""
root = _Node()
root = HierarchyNode()
# Iterate over each signal to be included in the tree.
for signal in signals:
@ -57,7 +57,7 @@ def _build_tree(signals, base_tree=None):
# Create the appropriate key for the node.
key = (name, number) if use_number else name
# Use setdefault to either get the existing child node or create a new one.
current = current.children.setdefault(key, _Node())
current = current.children.setdefault(key, HierarchyNode())
# Add the number to the set of numbers associated with this node.
current.numbers.add(number)
# Increment the count of signals that have traversed this node.
@ -68,7 +68,7 @@ def _build_tree(signals, base_tree=None):
return root
def _set_use_name(node, node_name=""):
def determine_name_usage(node, node_name=""):
"""
Recursively determines if node names should be used to ensure unique signal naming.
"""
@ -76,7 +76,7 @@ def _set_use_name(node, node_name=""):
# Recursively collect names from children, identifying if any naming conflicts occur.
child_name_sets = {
child_name: _set_use_name(child_node, child_name)
child_name: determine_name_usage(child_node, child_name)
for child_name, child_node in node.children.items()
}
@ -100,7 +100,7 @@ def _set_use_name(node, node_name=""):
return required_names
def _build_pnd_from_tree(tree, signals):
def build_signal_name_dict_from_tree(tree, signals):
"""
Constructs a mapping of signals to their names derived from a tree structure.
@ -109,7 +109,7 @@ def _build_pnd_from_tree(tree, signals):
"""
# Initialize a dictionary to hold the signal names.
pnd = {}
name_dict = {}
# Process each signal to build its hierarchical name.
for signal in signals:
@ -132,48 +132,48 @@ def _build_pnd_from_tree(tree, signals):
elements.append(element_name)
# Combine the name parts into the signal's full name.
pnd[signal] = "_".join(elements)
name_dict[signal] = "_".join(elements)
# Return the completed name dictionary.
return pnd
return name_dict
def _invert_pnd(pnd):
def invert_signal_name_dict(name_dict):
"""
Inverts a signal-to-name dictionary to a name-to-signals dictionary.
Parameters:
pnd (dict): A dictionary mapping signals to names.
name_dict (dict): A dictionary mapping signals to names.
Returns:
dict: An inverted dictionary where keys are names and values are lists of signals with that name.
"""
inv_pnd = {}
for signal, name in pnd.items():
inverted_dict = {}
for signal, name in name_dict.items():
# Get the list of signals for the current name, or initialize it if not present.
signals_with_name = inv_pnd.get(name, [])
signals_with_name = inverted_dict.get(name, [])
# Add the current signal to the list.
signals_with_name.append(signal)
# Place the updated list back in the dictionary.
inv_pnd[name] = signals_with_name
return inv_pnd
inverted_dict[name] = signals_with_name
return inverted_dict
def _list_conflicting_signals(pnd):
def list_conflicting_signals(name_dict):
"""Lists signals that have conflicting names in the provided mapping.
Parameters:
pnd (dict): A dictionary mapping signals to names.
name_dict (dict): A dictionary mapping signals to names.
Returns:
set: A set of signals that have name conflicts.
"""
# Invert the signal-to-name mapping to a name-to-signals mapping.
inv_pnd = _invert_pnd(pnd)
inverted_dict = invert_signal_name_dict(name_dict)
# Prepare a set to hold signals with conflicting names.
conflicts = set()
# Iterate through the inverted dictionary.
for name, signals in inv_pnd.items():
for name, signals in inverted_dict.items():
# If there is more than one signal for this name, it means there is a conflict.
if len(signals) > 1:
# Add all conflicting signals to our set.
@ -182,12 +182,12 @@ def _list_conflicting_signals(pnd):
# Return the set of all signals that have name conflicts.
return conflicts
def _set_use_number(tree, signals):
def set_number_usage(tree, signals):
"""
Updates nodes to use number suffixes to resolve naming conflicts when necessary.
Parameters:
tree (_Node): The root node of the naming tree.
tree (HierarchyNode): The root node of the naming tree.
signals (iterable): Signals potentially causing naming conflicts.
Returns:
@ -204,11 +204,11 @@ def _set_use_number(tree, signals):
node.use_number = node.signal_count > len(node.numbers) > 1
# Once use_number is True, it stays True.
def _build_pnd_for_group(group_n, signals):
def build_signal_name_dict_for_group(group_number, signals):
"""Builds a signal-to-name dictionary for a specific group of signals.
Parameters:
group_n (int): The group number.
group_number (int): The group number.
signals (iterable): The signals within the group.
Returns:
@ -216,21 +216,21 @@ def _build_pnd_for_group(group_n, signals):
"""
# Construct initial naming tree and name dictionary.
tree = _build_tree(signals)
_set_use_name(tree)
name_dict = _build_pnd_from_tree(tree, signals)
tree = build_hierarchy_tree(signals)
determine_name_usage(tree)
name_dict = build_signal_name_dict_from_tree(tree, signals)
# Address naming conflicts by introducing numbers.
conflicts = _list_conflicting_signals(name_dict)
conflicts = list_conflicting_signals(name_dict)
if conflicts:
_set_use_number(tree, conflicts)
set_number_usage(tree, conflicts)
# Rebuild tree and name dictionary if there were conflicts.
tree = _build_tree(signals, tree)
_set_use_name(tree)
name_dict = _build_pnd_from_tree(tree, signals)
tree = build_hierarchy_tree(signals, tree)
determine_name_usage(tree)
name_dict = build_signal_name_dict_from_tree(tree, signals)
# Disambiguate remaining conflicts using signal's unique identifier (DUID).
inv_name_dict = _invert_pnd(name_dict)
inv_name_dict = invert_signal_name_dict(name_dict)
for names, sigs in inv_name_dict.items():
if len(sigs) > 1:
for idx, sig in enumerate(sorted(sigs, key=lambda s: s.duid)):
@ -239,7 +239,7 @@ def _build_pnd_for_group(group_n, signals):
return name_dict
def _build_signal_groups(signals):
def build_signal_groups(signals):
"""Organizes signals into related groups.
Parameters:
@ -272,28 +272,27 @@ def _build_signal_groups(signals):
return grouped_signals
def _build_pnd(signals):
def build_signal_name_dict(signals):
"""Builds a complete signal-to-name dictionary using a hierarchical tree.
Parameters:
signals (iterable): An iterable of all signals to be named.
tree (_Node): The root node of the tree used for name resolution.
tree (HierarchyNode): The root node of the tree used for name resolution.
Returns:
dict: A complete dictionary mapping signals to their hierarchical names.
"""
# Group the signals based on their relationships.
groups = _build_signal_groups(signals)
groups = build_signal_groups(signals)
# Generate a name mapping for each group.
group_pnd_mappings = [_build_pnd_for_group(group_number, group_signals)
group_name_dict_mappings = [build_signal_name_dict_for_group(group_number, group_signals)
for group_number, group_signals in enumerate(groups)]
# Create the final signal-to-name mapping.
pnd = {}
for group_number, group_pnd in enumerate(group_pnd_mappings):
for signal, name in group_pnd.items():
name_dict = {}
for group_number, group_name_dict in enumerate(group_name_dict_mappings):
for signal, name in group_name_dict.items():
# Build the full hierarchical name for each signal.
hierarchical_name = name
current_group_number = group_number
@ -303,18 +302,18 @@ def _build_pnd(signals):
while current_signal.related is not None:
current_signal = current_signal.related
current_group_number -= 1
hierarchical_name = f"{group_pnd_mappings[current_group_number][current_signal]}_{hierarchical_name}"
hierarchical_name = f"{group_name_dict_mappings[current_group_number][current_signal]}_{hierarchical_name}"
# Map the signal to its full hierarchical name.
pnd[signal] = hierarchical_name
name_dict[signal] = hierarchical_name
return pnd
return name_dict
# Public Classes/Helpers ---------------------------------------------------------------------------
class Namespace:
class SignalNamespace:
"""
A Namespace object manages unique naming for signals within a hardware design.
A SignalNamespace object manages unique naming for signals within a hardware design.
It ensures that each signal has a unique, conflict-free name within the design's namespace. This
includes taking into account reserved keywords and handling signals that may share the same name
@ -323,7 +322,7 @@ class Namespace:
Attributes:
counts (dict): A dictionary to keep track of the number of times a particular name has been used.
sigs (dict): A dictionary mapping signals to a unique identifier to avoid name conflicts.
pnd (dict): The primary name dictionary that maps signals to their base names.
name_dict (dict): The primary name dictionary that maps signals to their base names.
clock_domains (dict): A dictionary managing the names of clock signals within various clock domains.
Methods:
@ -332,10 +331,10 @@ class Namespace:
regular signals, it uses overridden names or constructs names based on the signal's
hierarchical structure.
"""
def __init__(self, pnd, reserved_keywords=set()):
def __init__(self, name_dict, reserved_keywords=set()):
self.counts = {k: 1 for k in reserved_keywords}
self.sigs = {}
self.pnd = pnd
self.name_dict = name_dict
self.clock_domains = dict()
def get_name(self, sig):
@ -357,9 +356,9 @@ class Namespace:
# Use Name's override when set...
if sig.name_override is not None:
sig_name = sig.name_override
# ... else get Name from pnd.
# ... else get Name from name_dict.
else:
sig_name = self.pnd[sig]
sig_name = self.name_dict[sig]
# Check/Add numbering suffix when required.
# -----------------------------------------
@ -377,9 +376,8 @@ class Namespace:
# Return Name.
return sig_name + suffix
def build_namespace(signals, reserved_keywords=set()):
def build_signal_namespace(signals, reserved_keywords=set()):
"""Constructs a namespace where each signal is given a unique hierarchical name.
Parameters:
signals (iterable): An iterable of all signals to be named.
reserved_keywords (set, optional): A set of keywords that cannot be used as signal names.
@ -389,10 +387,10 @@ def build_namespace(signals, reserved_keywords=set()):
"""
# Create the primary signal-to-name dictionary.
pnd = _build_pnd(signals)
pnd = build_signal_name_dict(signals)
# Initialize the namespace with reserved keywords and the primary mapping.
namespace = Namespace(pnd, reserved_keywords)
namespace = SignalNamespace(pnd, reserved_keywords)
# Handle signals with overridden names, ensuring they are processed in a consistent order.
signals_with_name_override = filter(lambda s: s.name_override is not None, signals)
@ -400,3 +398,5 @@ def build_namespace(signals, reserved_keywords=set()):
namespace.get_name(signal)
return namespace
build_namespace = build_signal_namespace