2020-02-16 07:26:29 +08:00
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#!/usr/bin/env python
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#===----------------------------------------------------------------------===##
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#
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# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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# See https://llvm.org/LICENSE.txt for license information.
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# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#
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#===----------------------------------------------------------------------===##
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2021-03-23 05:38:28 +08:00
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import argparse
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2020-02-16 07:26:29 +08:00
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import os
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import re
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2021-03-23 05:38:28 +08:00
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def is_config_header(h):
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return os.path.basename(h) in ['__config', '__libcpp_version']
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def is_experimental_header(h):
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return ('experimental/' in h) or ('ext/' in h)
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def is_support_header(h):
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return '__support/' in h
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class FileEntry:
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def __init__(self, includes, individual_linecount):
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self.includes = includes
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self.individual_linecount = individual_linecount
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self.cumulative_linecount = None # documentation: this gets filled in later
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self.is_graph_root = None # documentation: this gets filled in later
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def list_all_roots_under(root):
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result = []
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for root, _, files in os.walk(root):
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for fname in files:
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if '__support' in root:
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pass
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elif ('.' in fname and not fname.endswith('.h')):
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pass
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else:
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result.append(root + '/' + fname)
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return result
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def build_file_entry(fname, options):
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assert os.path.exists(fname)
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def locate_header_file(h, paths):
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for p in paths:
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fullname = p + '/' + h
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if os.path.exists(fullname):
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return fullname
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if options.error_on_file_not_found:
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raise RuntimeError('Header not found: %s, included by %s' % (h, fname))
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return None
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local_includes = []
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system_includes = []
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linecount = 0
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with open(fname, 'r') as f:
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for line in f.readlines():
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linecount += 1
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m = re.match(r'\s*#\s*include\s+"([^"]*)"', line)
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if m is not None:
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local_includes.append(m.group(1))
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m = re.match(r'\s*#\s*include\s+<([^>]*)>', line)
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if m is not None:
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system_includes.append(m.group(1))
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fully_qualified_includes = [
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locate_header_file(h, options.search_dirs)
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for h in system_includes
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] + [
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locate_header_file(h, os.path.dirname(fname))
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for h in local_includes
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]
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return FileEntry(
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# If file-not-found wasn't an error, then skip non-found files
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includes = [h for h in fully_qualified_includes if h is not None],
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individual_linecount = linecount,
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)
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def transitive_closure_of_includes(graph, h1):
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visited = set()
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def explore(graph, h1):
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if h1 not in visited:
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visited.add(h1)
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for h2 in graph[h1].includes:
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explore(graph, h2)
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explore(graph, h1)
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return visited
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def transitively_includes(graph, h1, h2):
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return (h1 != h2) and (h2 in transitive_closure_of_includes(graph, h1))
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def build_graph(roots, options):
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original_roots = list(roots)
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graph = {}
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while roots:
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frontier = roots
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roots = []
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for fname in frontier:
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if fname not in graph:
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graph[fname] = build_file_entry(fname, options)
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graph[fname].is_graph_root = (fname in original_roots)
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roots += graph[fname].includes
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for fname, entry in graph.items():
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entry.cumulative_linecount = sum(graph[h].individual_linecount for h in transitive_closure_of_includes(graph, fname))
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return graph
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def get_graphviz(graph, options):
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def get_friendly_id(fname):
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i = fname.index('include/')
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assert(i >= 0)
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result = fname[i+8:]
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return result
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def get_decorators(fname, entry):
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result = ''
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if entry.is_graph_root:
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result += ' [style=bold]'
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if options.show_individual_line_counts and options.show_cumulative_line_counts:
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result += ' [label="%s\\n%d indiv, %d cumul"]' % (
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get_friendly_id(fname), entry.individual_linecount, entry.cumulative_linecount
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)
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elif options.show_individual_line_counts:
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result += ' [label="%s\\n%d indiv"]' % (get_friendly_id(fname), entry.individual_linecount)
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elif options.show_cumulative_line_counts:
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result += ' [label="%s\\n%d cumul"]' % (get_friendly_id(fname), entry.cumulative_linecount)
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return result
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result = ''
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result += 'strict digraph {\n'
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result += ' rankdir=LR;\n'
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result += ' layout=dot;\n\n'
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for fname, entry in graph.items():
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result += ' "%s"%s;\n' % (get_friendly_id(fname), get_decorators(fname, entry))
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for h in entry.includes:
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if any(transitively_includes(graph, i, h) for i in entry.includes) and not options.show_transitive_edges:
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continue
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result += ' "%s" -> "%s";\n' % (get_friendly_id(fname), get_friendly_id(h))
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result += '}\n'
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return result
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2020-02-16 07:26:29 +08:00
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if __name__ == '__main__':
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2021-03-23 05:38:28 +08:00
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parser = argparse.ArgumentParser(description='Produce a dependency graph of libc++ headers, in GraphViz dot format.')
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parser.add_argument('--root', default=None, metavar='FILE', help='File or directory to be the root of the dependency graph')
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parser.add_argument('-I', dest='search_dirs', default=[], action='append', metavar='DIR', help='Path(s) to search for local includes')
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parser.add_argument('--show-transitive-edges', action='store_true', help='Show edges to headers that are transitively included anyway')
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parser.add_argument('--show-config-headers', action='store_true', help='Show headers named __config')
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parser.add_argument('--show-experimental-headers', action='store_true', help='Show headers in the experimental/ and ext/ directories')
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parser.add_argument('--show-support-headers', action='store_true', help='Show headers in the __support/ directory')
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parser.add_argument('--show-individual-line-counts', action='store_true', help='Include an individual line count in each node')
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parser.add_argument('--show-cumulative-line-counts', action='store_true', help='Include a total line count in each node')
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parser.add_argument('--error-on-file-not-found', action='store_true', help="Don't ignore failure to open an #included file")
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options = parser.parse_args()
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if options.root is None:
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curr_dir = os.path.dirname(os.path.abspath(__file__))
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options.root = os.path.join(curr_dir, '../include')
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if options.search_dirs == [] and os.path.isdir(options.root):
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options.search_dirs = [options.root]
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options.root = os.path.abspath(options.root)
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options.search_dirs = [os.path.abspath(p) for p in options.search_dirs]
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if os.path.isdir(options.root):
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roots = list_all_roots_under(options.root)
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elif os.path.isfile(options.root):
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roots = [options.root]
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else:
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raise RuntimeError('--root seems to be invalid')
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graph = build_graph(roots, options)
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# Eliminate certain kinds of "visual noise" headers, if asked for.
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def should_keep(fname):
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return all([
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options.show_config_headers or not is_config_header(fname),
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options.show_experimental_headers or not is_experimental_header(fname),
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options.show_support_headers or not is_support_header(fname),
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])
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for fname in list(graph.keys()):
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if should_keep(fname):
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graph[fname].includes = [h for h in graph[fname].includes if should_keep(h)]
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else:
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del graph[fname]
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# Look for cycles.
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no_cycles_detected = True
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for fname, entry in graph.items():
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for h in entry.includes:
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if transitively_includes(graph, h, fname):
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print('Cycle detected between %s and %s' % (fname, h))
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no_cycles_detected = False
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assert no_cycles_detected
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print(get_graphviz(graph, options))
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