xref: /llvm-project/clang/utils/analyzer/exploded-graph-rewriter.py (revision 0cdd13c05a16c90aa4dde56e1e46ca7e0a7261d6)
1#!/usr/bin/env python
2#
3#===- exploded-graph-rewriter.py - ExplodedGraph dump tool -----*- python -*--#
4#
5# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
6# See https://llvm.org/LICENSE.txt for license information.
7# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
8#
9#===-----------------------------------------------------------------------===#
10
11
12from __future__ import print_function
13
14import argparse
15import collections
16import json
17import logging
18import re
19
20
21# A helper function for finding the difference between two dictionaries.
22def diff_dicts(curr, prev):
23    removed = [k for k in prev if k not in curr or curr[k] != prev[k]]
24    added = [k for k in curr if k not in prev or curr[k] != prev[k]]
25    return (removed, added)
26
27
28# Represents any program state trait that is a dictionary of key-value pairs.
29class GenericMap(object):
30    def __init__(self, generic_map):
31        self.generic_map = generic_map
32
33    def diff(self, prev):
34        return diff_dicts(self.generic_map, prev.generic_map)
35
36    def is_different(self, prev):
37        removed, added = self.diff(prev)
38        return len(removed) != 0 or len(added) != 0
39
40
41# A deserialized source location.
42class SourceLocation(object):
43    def __init__(self, json_loc):
44        super(SourceLocation, self).__init__()
45        self.line = json_loc['line']
46        self.col = json_loc['column']
47        self.filename = json_loc['filename'] \
48            if 'filename' in json_loc else '(main file)'
49
50
51# A deserialized program point.
52class ProgramPoint(object):
53    def __init__(self, json_pp):
54        super(ProgramPoint, self).__init__()
55        self.kind = json_pp['kind']
56        self.tag = json_pp['tag']
57        if self.kind == 'Edge':
58            self.src_id = json_pp['src_id']
59            self.dst_id = json_pp['dst_id']
60        elif self.kind == 'Statement':
61            self.stmt_kind = json_pp['stmt_kind']
62            self.pointer = json_pp['pointer']
63            self.pretty = json_pp['pretty']
64            self.loc = SourceLocation(json_pp['location']) \
65                if json_pp['location'] is not None else None
66        elif self.kind == 'BlockEntrance':
67            self.block_id = json_pp['block_id']
68
69
70# A single expression acting as a key in a deserialized Environment.
71class EnvironmentBindingKey(object):
72    def __init__(self, json_ek):
73        super(EnvironmentBindingKey, self).__init__()
74        self.stmt_id = json_ek['stmt_id']
75        self.pretty = json_ek['pretty']
76
77    def _key(self):
78        return self.stmt_id
79
80    def __eq__(self, other):
81        return self._key() == other._key()
82
83    def __hash__(self):
84        return hash(self._key())
85
86
87# Deserialized description of a location context.
88class LocationContext(object):
89    def __init__(self, json_frame):
90        super(LocationContext, self).__init__()
91        self.lctx_id = json_frame['lctx_id']
92        self.caption = json_frame['location_context']
93        self.decl = json_frame['calling']
94        self.line = json_frame['call_line']
95
96    def _key(self):
97        return self.lctx_id
98
99    def __eq__(self, other):
100        return self._key() == other._key()
101
102    def __hash__(self):
103        return hash(self._key())
104
105
106# A group of deserialized Environment bindings that correspond to a specific
107# location context.
108class EnvironmentFrame(object):
109    def __init__(self, json_frame):
110        super(EnvironmentFrame, self).__init__()
111        self.location_context = LocationContext(json_frame)
112        self.bindings = collections.OrderedDict(
113            [(EnvironmentBindingKey(b),
114              b['value']) for b in json_frame['items']]
115            if json_frame['items'] is not None else [])
116
117    def diff_bindings(self, prev):
118        return diff_dicts(self.bindings, prev.bindings)
119
120    def is_different(self, prev):
121        removed, added = self.diff_bindings(prev)
122        return len(removed) != 0 or len(added) != 0
123
124
125# A deserialized Environment.
126class Environment(object):
127    def __init__(self, json_e):
128        super(Environment, self).__init__()
129        self.ptr = json_e['pointer']
130        self.frames = [EnvironmentFrame(f) for f in json_e['items']]
131
132    def diff_frames(self, prev):
133        # TODO: It's difficult to display a good diff when frame numbers shift.
134        if len(self.frames) != len(prev.frames):
135            return None
136
137        updated = []
138        for i in range(len(self.frames)):
139            f = self.frames[i]
140            prev_f = prev.frames[i]
141            if f.location_context == prev_f.location_context:
142                if f.is_different(prev_f):
143                    updated.append(i)
144            else:
145                # We have the whole frame replaced with another frame.
146                # TODO: Produce a nice diff.
147                return None
148
149        # TODO: Add support for added/removed.
150        return updated
151
152    def is_different(self, prev):
153        updated = self.diff_frames(prev)
154        return updated is None or len(updated) > 0
155
156
157# A single binding key in a deserialized RegionStore cluster.
158class StoreBindingKey(object):
159    def __init__(self, json_sk):
160        super(StoreBindingKey, self).__init__()
161        self.kind = json_sk['kind']
162        self.offset = json_sk['offset']
163
164    def _key(self):
165        return (self.kind, self.offset)
166
167    def __eq__(self, other):
168        return self._key() == other._key()
169
170    def __hash__(self):
171        return hash(self._key())
172
173
174# A single cluster of the deserialized RegionStore.
175class StoreCluster(object):
176    def __init__(self, json_sc):
177        super(StoreCluster, self).__init__()
178        self.base_region = json_sc['cluster']
179        self.bindings = collections.OrderedDict(
180            [(StoreBindingKey(b), b['value']) for b in json_sc['items']])
181
182    def diff_bindings(self, prev):
183        return diff_dicts(self.bindings, prev.bindings)
184
185    def is_different(self, prev):
186        removed, added = self.diff_bindings(prev)
187        return len(removed) != 0 or len(added) != 0
188
189
190# A deserialized RegionStore.
191class Store(object):
192    def __init__(self, json_s):
193        super(Store, self).__init__()
194        self.ptr = json_s['pointer']
195        self.clusters = collections.OrderedDict(
196            [(c['pointer'], StoreCluster(c)) for c in json_s['items']])
197
198    def diff_clusters(self, prev):
199        removed = [k for k in prev.clusters if k not in self.clusters]
200        added = [k for k in self.clusters if k not in prev.clusters]
201        updated = [k for k in prev.clusters if k in self.clusters
202                   and prev.clusters[k].is_different(self.clusters[k])]
203        return (removed, added, updated)
204
205    def is_different(self, prev):
206        removed, added, updated = self.diff_clusters(prev)
207        return len(removed) != 0 or len(added) != 0 or len(updated) != 0
208
209
210# A deserialized program state.
211class ProgramState(object):
212    def __init__(self, state_id, json_ps):
213        super(ProgramState, self).__init__()
214        logging.debug('Adding ProgramState ' + str(state_id))
215
216        self.state_id = state_id
217        self.store = Store(json_ps['store']) \
218            if json_ps['store'] is not None else None
219        self.environment = Environment(json_ps['environment']) \
220            if json_ps['environment'] is not None else None
221        self.constraints = GenericMap(collections.OrderedDict([
222            (c['symbol'], c['range']) for c in json_ps['constraints']
223        ])) if json_ps['constraints'] is not None else None
224        # TODO: Objects under construction.
225        # TODO: Dynamic types of objects.
226        # TODO: Checker messages.
227
228
229# A deserialized exploded graph node. Has a default constructor because it
230# may be referenced as part of an edge before its contents are deserialized,
231# and in this moment we already need a room for predecessors and successors.
232class ExplodedNode(object):
233    def __init__(self):
234        super(ExplodedNode, self).__init__()
235        self.predecessors = []
236        self.successors = []
237
238    def construct(self, node_id, json_node):
239        logging.debug('Adding ' + node_id)
240        self.node_id = json_node['node_id']
241        self.ptr = json_node['pointer']
242        self.points = [ProgramPoint(p) for p in json_node['program_points']]
243        self.state = ProgramState(json_node['state_id'],
244                                  json_node['program_state']) \
245            if json_node['program_state'] is not None else None
246
247        assert self.node_name() == node_id
248
249    def node_name(self):
250        return 'Node' + self.ptr
251
252
253# A deserialized ExplodedGraph. Constructed by consuming a .dot file
254# line-by-line.
255class ExplodedGraph(object):
256    # Parse .dot files with regular expressions.
257    node_re = re.compile(
258        '^(Node0x[0-9a-f]*) \\[shape=record,.*label="{(.*)\\\\l}"\\];$')
259    edge_re = re.compile(
260        '^(Node0x[0-9a-f]*) -> (Node0x[0-9a-f]*);$')
261
262    def __init__(self):
263        super(ExplodedGraph, self).__init__()
264        self.nodes = collections.defaultdict(ExplodedNode)
265        self.root_id = None
266        self.incomplete_line = ''
267
268    def add_raw_line(self, raw_line):
269        if raw_line.startswith('//'):
270            return
271
272        # Allow line breaks by waiting for ';'. This is not valid in
273        # a .dot file, but it is useful for writing tests.
274        if len(raw_line) > 0 and raw_line[-1] != ';':
275            self.incomplete_line += raw_line
276            return
277        raw_line = self.incomplete_line + raw_line
278        self.incomplete_line = ''
279
280        # Apply regexps one by one to see if it's a node or an edge
281        # and extract contents if necessary.
282        logging.debug('Line: ' + raw_line)
283        result = self.edge_re.match(raw_line)
284        if result is not None:
285            logging.debug('Classified as edge line.')
286            pred = result.group(1)
287            succ = result.group(2)
288            self.nodes[pred].successors.append(succ)
289            self.nodes[succ].predecessors.append(pred)
290            return
291        result = self.node_re.match(raw_line)
292        if result is not None:
293            logging.debug('Classified as node line.')
294            node_id = result.group(1)
295            if len(self.nodes) == 0:
296                self.root_id = node_id
297            # Note: when writing tests you don't need to escape everything,
298            # even though in a valid dot file everything is escaped.
299            node_label = result.group(2).replace('\\l', '') \
300                                        .replace(' ', '') \
301                                        .replace('\\"', '"') \
302                                        .replace('\\{', '{') \
303                                        .replace('\\}', '}') \
304                                        .replace('\\\\', '\\') \
305                                        .replace('\\|', '|') \
306                                        .replace('\\<', '\\\\<') \
307                                        .replace('\\>', '\\\\>') \
308                                        .rstrip(',')
309            logging.debug(node_label)
310            json_node = json.loads(node_label)
311            self.nodes[node_id].construct(node_id, json_node)
312            return
313        logging.debug('Skipping.')
314
315
316# A visitor that dumps the ExplodedGraph into a DOT file with fancy HTML-based
317# syntax highlighing.
318class DotDumpVisitor(object):
319    def __init__(self, do_diffs):
320        super(DotDumpVisitor, self).__init__()
321        self._do_diffs = do_diffs
322
323    @staticmethod
324    def _dump_raw(s):
325        print(s, end='')
326
327    @staticmethod
328    def _dump(s):
329        print(s.replace('&', '&amp;')
330               .replace('{', '\\{')
331               .replace('}', '\\}')
332               .replace('\\<', '&lt;')
333               .replace('\\>', '&gt;')
334               .replace('\\l', '<br />')
335               .replace('|', '\\|'), end='')
336
337    @staticmethod
338    def _diff_plus_minus(is_added):
339        if is_added is None:
340            return ''
341        if is_added:
342            return '<font color="forestgreen">+</font>'
343        return '<font color="red">-</font>'
344
345    def visit_begin_graph(self, graph):
346        self._graph = graph
347        self._dump_raw('digraph "ExplodedGraph" {\n')
348        self._dump_raw('label="";\n')
349
350    def visit_program_point(self, p):
351        if p.kind in ['Edge', 'BlockEntrance', 'BlockExit']:
352            color = 'gold3'
353        elif p.kind in ['PreStmtPurgeDeadSymbols',
354                        'PostStmtPurgeDeadSymbols']:
355            color = 'red'
356        elif p.kind in ['CallEnter', 'CallExitBegin', 'CallExitEnd']:
357            color = 'blue'
358        elif p.kind in ['Statement']:
359            color = 'cyan3'
360        else:
361            color = 'forestgreen'
362
363        if p.kind == 'Statement':
364            if p.loc is not None:
365                self._dump('<tr><td align="left" width="0">'
366                           '%s:<b>%s</b>:<b>%s</b>:</td>'
367                           '<td align="left" width="0"><font color="%s">'
368                           '%s</font></td><td>%s</td></tr>'
369                           % (p.loc.filename, p.loc.line,
370                              p.loc.col, color, p.stmt_kind, p.pretty))
371            else:
372                self._dump('<tr><td align="left" width="0">'
373                           '<i>Invalid Source Location</i>:</td>'
374                           '<td align="left" width="0">'
375                           '<font color="%s">%s</font></td><td>%s</td></tr>'
376                           % (color, p.stmt_kind, p.pretty))
377        elif p.kind == 'Edge':
378            self._dump('<tr><td width="0"></td>'
379                       '<td align="left" width="0">'
380                       '<font color="%s">%s</font></td><td align="left">'
381                       '[B%d] -\\> [B%d]</td></tr>'
382                       % (color, p.kind, p.src_id, p.dst_id))
383        else:
384            # TODO: Print more stuff for other kinds of points.
385            self._dump('<tr><td width="0"></td>'
386                       '<td align="left" width="0" colspan="2">'
387                       '<font color="%s">%s</font></td></tr>'
388                       % (color, p.kind))
389
390    def visit_environment(self, e, prev_e=None):
391        self._dump('<table border="0">')
392
393        def dump_location_context(lc, is_added=None):
394            self._dump('<tr><td>%s</td>'
395                       '<td align="left"><b>%s</b></td>'
396                       '<td align="left"><font color="grey60">%s </font>'
397                       '%s</td></tr>'
398                       % (self._diff_plus_minus(is_added),
399                          lc.caption, lc.decl,
400                          ('(line %s)' % lc.line) if lc.line is not None
401                          else ''))
402
403        def dump_binding(f, b, is_added=None):
404            self._dump('<tr><td>%s</td>'
405                       '<td align="left"><i>S%s</i></td>'
406                       '<td align="left">%s</td>'
407                       '<td align="left">%s</td></tr>'
408                       % (self._diff_plus_minus(is_added),
409                          b.stmt_id, b.pretty, f.bindings[b]))
410
411        frames_updated = e.diff_frames(prev_e) if prev_e is not None else None
412        if frames_updated:
413            for i in frames_updated:
414                f = e.frames[i]
415                prev_f = prev_e.frames[i]
416                dump_location_context(f.location_context)
417                bindings_removed, bindings_added = f.diff_bindings(prev_f)
418                for b in bindings_removed:
419                    dump_binding(prev_f, b, False)
420                for b in bindings_added:
421                    dump_binding(f, b, True)
422        else:
423            for f in e.frames:
424                dump_location_context(f.location_context)
425                for b in f.bindings:
426                    dump_binding(f, b)
427
428        self._dump('</table>')
429
430    def visit_environment_in_state(self, s, prev_s=None):
431        self._dump('<tr><td align="left">'
432                   '<b>Environment: </b>')
433        if s.environment is None:
434            self._dump('<i> Nothing!</i>')
435        else:
436            if prev_s is not None and prev_s.environment is not None:
437                if s.environment.is_different(prev_s.environment):
438                    self._dump('</td></tr><tr><td align="left">')
439                    self.visit_environment(s.environment, prev_s.environment)
440                else:
441                    self._dump('<i> No changes!</i>')
442            else:
443                self._dump('</td></tr><tr><td align="left">')
444                self.visit_environment(s.environment)
445
446        self._dump('</td></tr>')
447
448    def visit_store(self, s, prev_s=None):
449        self._dump('<table border="0">')
450
451        def dump_binding(s, c, b, is_added=None):
452            self._dump('<tr><td>%s</td>'
453                       '<td align="left">%s</td>'
454                       '<td align="left">%s</td>'
455                       '<td align="left">%s</td>'
456                       '<td align="left">%s</td></tr>'
457                       % (self._diff_plus_minus(is_added),
458                          s.clusters[c].base_region, b.offset,
459                          '(<i>Default</i>)' if b.kind == 'Default'
460                          else '',
461                          s.clusters[c].bindings[b]))
462
463        if prev_s is not None:
464            clusters_removed, clusters_added, clusters_updated = \
465                s.diff_clusters(prev_s)
466            for c in clusters_removed:
467                for b in prev_s.clusters[c].bindings:
468                    dump_binding(prev_s, c, b, False)
469            for c in clusters_updated:
470                bindings_removed, bindings_added = \
471                    s.clusters[c].diff_bindings(prev_s.clusters[c])
472                for b in bindings_removed:
473                    dump_binding(prev_s, c, b, False)
474                for b in bindings_added:
475                    dump_binding(s, c, b, True)
476            for c in clusters_added:
477                for b in s.clusters[c].bindings:
478                    dump_binding(s, c, b, True)
479        else:
480            for c in s.clusters:
481                for b in s.clusters[c].bindings:
482                    dump_binding(s, c, b)
483
484        self._dump('</table>')
485
486    def visit_store_in_state(self, s, prev_s=None):
487        self._dump('<tr><td align="left"><b>Store: </b>')
488        if s.store is None:
489            self._dump('<i> Nothing!</i>')
490        else:
491            if prev_s is not None and prev_s.store is not None:
492                if s.store.is_different(prev_s.store):
493                    self._dump('</td></tr><tr><td align="left">')
494                    self.visit_store(s.store, prev_s.store)
495                else:
496                    self._dump('<i> No changes!</i>')
497            else:
498                self._dump('</td></tr><tr><td align="left">')
499                self.visit_store(s.store)
500        self._dump('</td></tr>')
501
502    def visit_generic_map(self, m, prev_m=None):
503        self._dump('<table border="0">')
504
505        def dump_pair(m, k, is_added=None):
506            self._dump('<tr><td>%s</td>'
507                       '<td align="left">%s</td>'
508                       '<td align="left">%s</td></tr>'
509                       % (self._diff_plus_minus(is_added),
510                          k, m.generic_map[k]))
511
512        if prev_m is not None:
513            removed, added = m.diff(prev_m)
514            for k in removed:
515                dump_pair(prev_m, k, False)
516            for k in added:
517                dump_pair(m, k, True)
518        else:
519            for k in m.generic_map:
520                dump_pair(m, k, None)
521
522        self._dump('</table>')
523
524    def visit_generic_map_in_state(self, selector, s, prev_s=None):
525        self._dump('<tr><td align="left">'
526                   '<b>Ranges: </b>')
527        m = getattr(s, selector)
528        if m is None:
529            self._dump('<i> Nothing!</i>')
530        else:
531            prev_m = None
532            if prev_s is not None:
533                prev_m = getattr(prev_s, selector)
534                if prev_m is not None:
535                    if m.is_different(prev_m):
536                        self._dump('</td></tr><tr><td align="left">')
537                        self.visit_generic_map(m, prev_m)
538                    else:
539                        self._dump('<i> No changes!</i>')
540            if prev_m is None:
541                self._dump('</td></tr><tr><td align="left">')
542                self.visit_generic_map(m)
543        self._dump('</td></tr>')
544
545    def visit_state(self, s, prev_s):
546        self.visit_store_in_state(s, prev_s)
547        self._dump('<hr />')
548        self.visit_environment_in_state(s, prev_s)
549        self._dump('<hr />')
550        self.visit_generic_map_in_state('constraints', s, prev_s)
551
552    def visit_node(self, node):
553        self._dump('%s [shape=record,label=<<table border="0">'
554                   % (node.node_name()))
555
556        self._dump('<tr><td bgcolor="grey"><b>Node %d (%s) - '
557                   'State %s</b></td></tr>'
558                   % (node.node_id, node.ptr, node.state.state_id
559                      if node.state is not None else 'Unspecified'))
560        self._dump('<tr><td align="left" width="0">')
561        if len(node.points) > 1:
562            self._dump('<b>Program points:</b></td></tr>')
563        else:
564            self._dump('<b>Program point:</b></td></tr>')
565        self._dump('<tr><td align="left" width="0">'
566                   '<table border="0" align="left" width="0">')
567        for p in node.points:
568            self.visit_program_point(p)
569        self._dump('</table></td></tr>')
570
571        if node.state is not None:
572            self._dump('<hr />')
573            prev_s = None
574            # Do diffs only when we have a unique predecessor.
575            # Don't do diffs on the leaf nodes because they're
576            # the important ones.
577            if self._do_diffs and len(node.predecessors) == 1 \
578               and len(node.successors) > 0:
579                prev_s = self._graph.nodes[node.predecessors[0]].state
580            self.visit_state(node.state, prev_s)
581        self._dump_raw('</table>>];\n')
582
583    def visit_edge(self, pred, succ):
584        self._dump_raw('%s -> %s;\n' % (pred.node_name(), succ.node_name()))
585
586    def visit_end_of_graph(self):
587        self._dump_raw('}\n')
588
589
590# A class that encapsulates traversal of the ExplodedGraph. Different explorer
591# kinds could potentially traverse specific sub-graphs.
592class Explorer(object):
593    def __init__(self):
594        super(Explorer, self).__init__()
595
596    def explore(self, graph, visitor):
597        visitor.visit_begin_graph(graph)
598        for node in sorted(graph.nodes):
599            logging.debug('Visiting ' + node)
600            visitor.visit_node(graph.nodes[node])
601            for succ in sorted(graph.nodes[node].successors):
602                logging.debug('Visiting edge: %s -> %s ' % (node, succ))
603                visitor.visit_edge(graph.nodes[node], graph.nodes[succ])
604        visitor.visit_end_of_graph()
605
606
607def main():
608    parser = argparse.ArgumentParser()
609    parser.add_argument('filename', type=str)
610    parser.add_argument('-v', '--verbose', action='store_const',
611                        dest='loglevel', const=logging.DEBUG,
612                        default=logging.WARNING,
613                        help='enable info prints')
614    parser.add_argument('-d', '--diff', action='store_const', dest='diff',
615                        const=True, default=False,
616                        help='display differences between states')
617    args = parser.parse_args()
618    logging.basicConfig(level=args.loglevel)
619
620    graph = ExplodedGraph()
621    with open(args.filename) as fd:
622        for raw_line in fd:
623            raw_line = raw_line.strip()
624            graph.add_raw_line(raw_line)
625
626    explorer = Explorer()
627    visitor = DotDumpVisitor(args.diff)
628    explorer.explore(graph, visitor)
629
630
631if __name__ == '__main__':
632    main()
633