xref: /llvm-project/clang/utils/analyzer/exploded-graph-rewriter.py (revision beb85ad66de5af11e45bae236a3dd5a6a4762150)
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.frames = [EnvironmentFrame(f) for f in json_e]
130
131    def diff_frames(self, prev):
132        # TODO: It's difficult to display a good diff when frame numbers shift.
133        if len(self.frames) != len(prev.frames):
134            return None
135
136        updated = []
137        for i in range(len(self.frames)):
138            f = self.frames[i]
139            prev_f = prev.frames[i]
140            if f.location_context == prev_f.location_context:
141                if f.is_different(prev_f):
142                    updated.append(i)
143            else:
144                # We have the whole frame replaced with another frame.
145                # TODO: Produce a nice diff.
146                return None
147
148        # TODO: Add support for added/removed.
149        return updated
150
151    def is_different(self, prev):
152        updated = self.diff_frames(prev)
153        return updated is None or len(updated) > 0
154
155
156# A single binding key in a deserialized RegionStore cluster.
157class StoreBindingKey(object):
158    def __init__(self, json_sk):
159        super(StoreBindingKey, self).__init__()
160        self.kind = json_sk['kind']
161        self.offset = json_sk['offset']
162
163    def _key(self):
164        return (self.kind, self.offset)
165
166    def __eq__(self, other):
167        return self._key() == other._key()
168
169    def __hash__(self):
170        return hash(self._key())
171
172
173# A single cluster of the deserialized RegionStore.
174class StoreCluster(object):
175    def __init__(self, json_sc):
176        super(StoreCluster, self).__init__()
177        self.base_region = json_sc['cluster']
178        self.bindings = collections.OrderedDict(
179            [(StoreBindingKey(b), b['value']) for b in json_sc['items']])
180
181    def diff_bindings(self, prev):
182        return diff_dicts(self.bindings, prev.bindings)
183
184    def is_different(self, prev):
185        removed, added = self.diff_bindings(prev)
186        return len(removed) != 0 or len(added) != 0
187
188
189# A deserialized RegionStore.
190class Store(object):
191    def __init__(self, json_s):
192        super(Store, self).__init__()
193        self.clusters = collections.OrderedDict(
194            [(c['pointer'], StoreCluster(c)) for c in json_s])
195
196    def diff_clusters(self, prev):
197        removed = [k for k in prev.clusters if k not in self.clusters]
198        added = [k for k in self.clusters if k not in prev.clusters]
199        updated = [k for k in prev.clusters if k in self.clusters
200                   and prev.clusters[k].is_different(self.clusters[k])]
201        return (removed, added, updated)
202
203    def is_different(self, prev):
204        removed, added, updated = self.diff_clusters(prev)
205        return len(removed) != 0 or len(added) != 0 or len(updated) != 0
206
207
208# A deserialized program state.
209class ProgramState(object):
210    def __init__(self, state_id, json_ps):
211        super(ProgramState, self).__init__()
212        logging.debug('Adding ProgramState ' + str(state_id))
213
214        self.state_id = state_id
215        self.store = Store(json_ps['store']) \
216            if json_ps['store'] is not None else None
217        self.environment = Environment(json_ps['environment']) \
218            if json_ps['environment'] is not None else None
219        self.constraints = GenericMap(collections.OrderedDict([
220            (c['symbol'], c['range']) for c in json_ps['constraints']
221        ])) if json_ps['constraints'] is not None else None
222        # TODO: Objects under construction.
223        # TODO: Dynamic types of objects.
224        # TODO: Checker messages.
225
226
227# A deserialized exploded graph node. Has a default constructor because it
228# may be referenced as part of an edge before its contents are deserialized,
229# and in this moment we already need a room for predecessors and successors.
230class ExplodedNode(object):
231    def __init__(self):
232        super(ExplodedNode, self).__init__()
233        self.predecessors = []
234        self.successors = []
235
236    def construct(self, node_id, json_node):
237        logging.debug('Adding ' + node_id)
238        self.node_id = json_node['node_id']
239        self.ptr = json_node['pointer']
240        self.points = [ProgramPoint(p) for p in json_node['program_points']]
241        self.state = ProgramState(json_node['state_id'],
242                                  json_node['program_state']) \
243            if json_node['program_state'] is not None else None
244
245        assert self.node_name() == node_id
246
247    def node_name(self):
248        return 'Node' + self.ptr
249
250
251# A deserialized ExplodedGraph. Constructed by consuming a .dot file
252# line-by-line.
253class ExplodedGraph(object):
254    # Parse .dot files with regular expressions.
255    node_re = re.compile(
256        '^(Node0x[0-9a-f]*) \\[shape=record,.*label="{(.*)\\\\l}"\\];$')
257    edge_re = re.compile(
258        '^(Node0x[0-9a-f]*) -> (Node0x[0-9a-f]*);$')
259
260    def __init__(self):
261        super(ExplodedGraph, self).__init__()
262        self.nodes = collections.defaultdict(ExplodedNode)
263        self.root_id = None
264        self.incomplete_line = ''
265
266    def add_raw_line(self, raw_line):
267        if raw_line.startswith('//'):
268            return
269
270        # Allow line breaks by waiting for ';'. This is not valid in
271        # a .dot file, but it is useful for writing tests.
272        if len(raw_line) > 0 and raw_line[-1] != ';':
273            self.incomplete_line += raw_line
274            return
275        raw_line = self.incomplete_line + raw_line
276        self.incomplete_line = ''
277
278        # Apply regexps one by one to see if it's a node or an edge
279        # and extract contents if necessary.
280        logging.debug('Line: ' + raw_line)
281        result = self.edge_re.match(raw_line)
282        if result is not None:
283            logging.debug('Classified as edge line.')
284            pred = result.group(1)
285            succ = result.group(2)
286            self.nodes[pred].successors.append(succ)
287            self.nodes[succ].predecessors.append(pred)
288            return
289        result = self.node_re.match(raw_line)
290        if result is not None:
291            logging.debug('Classified as node line.')
292            node_id = result.group(1)
293            if len(self.nodes) == 0:
294                self.root_id = node_id
295            # Note: when writing tests you don't need to escape everything,
296            # even though in a valid dot file everything is escaped.
297            node_label = result.group(2).replace('\\l', '') \
298                                        .replace(' ', '') \
299                                        .replace('\\"', '"') \
300                                        .replace('\\{', '{') \
301                                        .replace('\\}', '}') \
302                                        .replace('\\\\', '\\') \
303                                        .replace('\\<', '\\\\<') \
304                                        .replace('\\>', '\\\\>') \
305                                        .rstrip(',')
306            logging.debug(node_label)
307            json_node = json.loads(node_label)
308            self.nodes[node_id].construct(node_id, json_node)
309            return
310        logging.debug('Skipping.')
311
312
313# A visitor that dumps the ExplodedGraph into a DOT file with fancy HTML-based
314# syntax highlighing.
315class DotDumpVisitor(object):
316    def __init__(self, do_diffs):
317        super(DotDumpVisitor, self).__init__()
318        self._do_diffs = do_diffs
319
320    @staticmethod
321    def _dump_raw(s):
322        print(s, end='')
323
324    @staticmethod
325    def _dump(s):
326        print(s.replace('&', '&amp;')
327               .replace('{', '\\{')
328               .replace('}', '\\}')
329               .replace('\\<', '&lt;')
330               .replace('\\>', '&gt;')
331               .replace('\\l', '<br />')
332               .replace('|', ''), end='')
333
334    @staticmethod
335    def _diff_plus_minus(is_added):
336        if is_added is None:
337            return ''
338        if is_added:
339            return '<font color="forestgreen">+</font>'
340        return '<font color="red">-</font>'
341
342    def visit_begin_graph(self, graph):
343        self._graph = graph
344        self._dump_raw('digraph "ExplodedGraph" {\n')
345        self._dump_raw('label="";\n')
346
347    def visit_program_point(self, p):
348        if p.kind in ['Edge', 'BlockEntrance', 'BlockExit']:
349            color = 'gold3'
350        elif p.kind in ['PreStmtPurgeDeadSymbols',
351                        'PostStmtPurgeDeadSymbols']:
352            color = 'red'
353        elif p.kind in ['CallEnter', 'CallExitBegin', 'CallExitEnd']:
354            color = 'blue'
355        elif p.kind in ['Statement']:
356            color = 'cyan3'
357        else:
358            color = 'forestgreen'
359
360        if p.kind == 'Statement':
361            if p.loc is not None:
362                self._dump('<tr><td align="left" width="0">'
363                           '%s:<b>%s</b>:<b>%s</b>:</td>'
364                           '<td align="left" width="0"><font color="%s">'
365                           '%s</font></td><td>%s</td></tr>'
366                           % (p.loc.filename, p.loc.line,
367                              p.loc.col, color, p.stmt_kind, p.pretty))
368            else:
369                self._dump('<tr><td align="left" width="0">'
370                           '<i>Invalid Source Location</i>:</td>'
371                           '<td align="left" width="0">'
372                           '<font color="%s">%s</font></td><td>%s</td></tr>'
373                           % (color, p.stmt_kind, p.pretty))
374        elif p.kind == 'Edge':
375            self._dump('<tr><td width="0"></td>'
376                       '<td align="left" width="0">'
377                       '<font color="%s">%s</font></td><td align="left">'
378                       '[B%d] -\\> [B%d]</td></tr>'
379                       % (color, p.kind, p.src_id, p.dst_id))
380        else:
381            # TODO: Print more stuff for other kinds of points.
382            self._dump('<tr><td width="0"></td>'
383                       '<td align="left" width="0" colspan="2">'
384                       '<font color="%s">%s</font></td></tr>'
385                       % (color, p.kind))
386
387    def visit_environment(self, e, prev_e=None):
388        self._dump('<table border="0">')
389
390        def dump_location_context(lc, is_added=None):
391            self._dump('<tr><td>%s</td>'
392                       '<td align="left"><b>%s</b></td>'
393                       '<td align="left"><font color="grey60">%s </font>'
394                       '%s</td></tr>'
395                       % (self._diff_plus_minus(is_added),
396                          lc.caption, lc.decl,
397                          ('(line %s)' % lc.line) if lc.line is not None
398                          else ''))
399
400        def dump_binding(f, b, is_added=None):
401            self._dump('<tr><td>%s</td>'
402                       '<td align="left"><i>S%s</i></td>'
403                       '<td align="left">%s</td>'
404                       '<td align="left">%s</td></tr>'
405                       % (self._diff_plus_minus(is_added),
406                          b.stmt_id, b.pretty, f.bindings[b]))
407
408        frames_updated = e.diff_frames(prev_e) if prev_e is not None else None
409        if frames_updated:
410            for i in frames_updated:
411                f = e.frames[i]
412                prev_f = prev_e.frames[i]
413                dump_location_context(f.location_context)
414                bindings_removed, bindings_added = f.diff_bindings(prev_f)
415                for b in bindings_removed:
416                    dump_binding(prev_f, b, False)
417                for b in bindings_added:
418                    dump_binding(f, b, True)
419        else:
420            for f in e.frames:
421                dump_location_context(f.location_context)
422                for b in f.bindings:
423                    dump_binding(f, b)
424
425        self._dump('</table>')
426
427    def visit_environment_in_state(self, s, prev_s=None):
428        self._dump('<tr><td align="left">'
429                   '<b>Environment: </b>')
430        if s.environment is None:
431            self._dump('<i> Nothing!</i>')
432        else:
433            if prev_s is not None and prev_s.environment is not None:
434                if s.environment.is_different(prev_s.environment):
435                    self._dump('</td></tr><tr><td align="left">')
436                    self.visit_environment(s.environment, prev_s.environment)
437                else:
438                    self._dump('<i> No changes!</i>')
439            else:
440                self._dump('</td></tr><tr><td align="left">')
441                self.visit_environment(s.environment)
442
443        self._dump('</td></tr>')
444
445    def visit_store(self, s, prev_s=None):
446        self._dump('<table border="0">')
447
448        def dump_binding(s, c, b, is_added=None):
449            self._dump('<tr><td>%s</td>'
450                       '<td align="left">%s</td>'
451                       '<td align="left">%s</td>'
452                       '<td align="left">%s</td>'
453                       '<td align="left">%s</td></tr>'
454                       % (self._diff_plus_minus(is_added),
455                          s.clusters[c].base_region, b.offset,
456                          '(<i>Default</i>)' if b.kind == 'Default'
457                          else '',
458                          s.clusters[c].bindings[b]))
459
460        if prev_s is not None:
461            clusters_removed, clusters_added, clusters_updated = \
462                s.diff_clusters(prev_s)
463            for c in clusters_removed:
464                for b in prev_s.clusters[c].bindings:
465                    dump_binding(prev_s, c, b, False)
466            for c in clusters_updated:
467                bindings_removed, bindings_added = \
468                    s.clusters[c].diff_bindings(prev_s.clusters[c])
469                for b in bindings_removed:
470                    dump_binding(prev_s, c, b, False)
471                for b in bindings_added:
472                    dump_binding(s, c, b, True)
473            for c in clusters_added:
474                for b in s.clusters[c].bindings:
475                    dump_binding(s, c, b, True)
476        else:
477            for c in s.clusters:
478                for b in s.clusters[c].bindings:
479                    dump_binding(s, c, b)
480
481        self._dump('</table>')
482
483    def visit_store_in_state(self, s, prev_s=None):
484        self._dump('<tr><td align="left"><b>Store: </b>')
485        if s.store is None:
486            self._dump('<i> Nothing!</i>')
487        else:
488            if prev_s is not None and prev_s.store is not None:
489                if s.store.is_different(prev_s.store):
490                    self._dump('</td></tr><tr><td align="left">')
491                    self.visit_store(s.store, prev_s.store)
492                else:
493                    self._dump('<i> No changes!</i>')
494            else:
495                self._dump('</td></tr><tr><td align="left">')
496                self.visit_store(s.store)
497        self._dump('</td></tr>')
498
499    def visit_generic_map(self, m, prev_m=None):
500        self._dump('<table border="0">')
501
502        def dump_pair(m, k, is_added=None):
503            self._dump('<tr><td>%s</td>'
504                       '<td align="left">%s</td>'
505                       '<td align="left">%s</td></tr>'
506                       % (self._diff_plus_minus(is_added),
507                          k, m.generic_map[k]))
508
509        if prev_m is not None:
510            removed, added = m.diff(prev_m)
511            for k in removed:
512                dump_pair(prev_m, k, False)
513            for k in added:
514                dump_pair(m, k, True)
515        else:
516            for k in m.generic_map:
517                dump_pair(m, k, None)
518
519        self._dump('</table>')
520
521    def visit_generic_map_in_state(self, selector, s, prev_s=None):
522        self._dump('<tr><td align="left">'
523                   '<b>Ranges: </b>')
524        m = getattr(s, selector)
525        if m is None:
526            self._dump('<i> Nothing!</i>')
527        else:
528            prev_m = None
529            if prev_s is not None:
530                prev_m = getattr(prev_s, selector)
531                if prev_m is not None:
532                    if m.is_different(prev_m):
533                        self._dump('</td></tr><tr><td align="left">')
534                        self.visit_generic_map(m, prev_m)
535                    else:
536                        self._dump('<i> No changes!</i>')
537            if prev_m is None:
538                self._dump('</td></tr><tr><td align="left">')
539                self.visit_generic_map(m)
540        self._dump('</td></tr>')
541
542    def visit_state(self, s, prev_s):
543        self.visit_store_in_state(s, prev_s)
544        self._dump('<hr />')
545        self.visit_environment_in_state(s, prev_s)
546        self._dump('<hr />')
547        self.visit_generic_map_in_state('constraints', s, prev_s)
548
549    def visit_node(self, node):
550        self._dump('%s [shape=record,label=<<table border="0">'
551                   % (node.node_name()))
552
553        self._dump('<tr><td bgcolor="grey"><b>Node %d (%s) - '
554                   'State %s</b></td></tr>'
555                   % (node.node_id, node.ptr, node.state.state_id
556                      if node.state is not None else 'Unspecified'))
557        self._dump('<tr><td align="left" width="0">')
558        if len(node.points) > 1:
559            self._dump('<b>Program points:</b></td></tr>')
560        else:
561            self._dump('<b>Program point:</b></td></tr>')
562        self._dump('<tr><td align="left" width="0">'
563                   '<table border="0" align="left" width="0">')
564        for p in node.points:
565            self.visit_program_point(p)
566        self._dump('</table></td></tr>')
567
568        if node.state is not None:
569            self._dump('<hr />')
570            prev_s = None
571            # Do diffs only when we have a unique predecessor.
572            # Don't do diffs on the leaf nodes because they're
573            # the important ones.
574            if self._do_diffs and len(node.predecessors) == 1 \
575               and len(node.successors) > 0:
576                prev_s = self._graph.nodes[node.predecessors[0]].state
577            self.visit_state(node.state, prev_s)
578        self._dump_raw('</table>>];\n')
579
580    def visit_edge(self, pred, succ):
581        self._dump_raw('%s -> %s;\n' % (pred.node_name(), succ.node_name()))
582
583    def visit_end_of_graph(self):
584        self._dump_raw('}\n')
585
586
587# A class that encapsulates traversal of the ExplodedGraph. Different explorer
588# kinds could potentially traverse specific sub-graphs.
589class Explorer(object):
590    def __init__(self):
591        super(Explorer, self).__init__()
592
593    def explore(self, graph, visitor):
594        visitor.visit_begin_graph(graph)
595        for node in sorted(graph.nodes):
596            logging.debug('Visiting ' + node)
597            visitor.visit_node(graph.nodes[node])
598            for succ in sorted(graph.nodes[node].successors):
599                logging.debug('Visiting edge: %s -> %s ' % (node, succ))
600                visitor.visit_edge(graph.nodes[node], graph.nodes[succ])
601        visitor.visit_end_of_graph()
602
603
604def main():
605    parser = argparse.ArgumentParser()
606    parser.add_argument('filename', type=str)
607    parser.add_argument('-v', '--verbose', action='store_const',
608                        dest='loglevel', const=logging.DEBUG,
609                        default=logging.WARNING,
610                        help='enable info prints')
611    parser.add_argument('-d', '--diff', action='store_const', dest='diff',
612                        const=True, default=False,
613                        help='display differences between states')
614    args = parser.parse_args()
615    logging.basicConfig(level=args.loglevel)
616
617    graph = ExplodedGraph()
618    with open(args.filename) as fd:
619        for raw_line in fd:
620            raw_line = raw_line.strip()
621            graph.add_raw_line(raw_line)
622
623    explorer = Explorer()
624    visitor = DotDumpVisitor(args.diff)
625    explorer.explore(graph, visitor)
626
627
628if __name__ == '__main__':
629    main()
630