aboutsummaryrefslogtreecommitdiff
path: root/src/processor/range_map_unittest.cc
blob: 996ae6d78253c0684e2c1b74dc53f7a10b1bf7c3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
// Copyright (c) 2010 Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// range_map_unittest.cc: Unit tests for RangeMap
//
// Author: Mark Mentovai


#include <limits.h>
#include <stdio.h>

#include "processor/range_map-inl.h"

#include "processor/linked_ptr.h"
#include "processor/logging.h"
#include "processor/scoped_ptr.h"


namespace {


using google_breakpad::linked_ptr;
using google_breakpad::scoped_ptr;
using google_breakpad::RangeMap;


// A CountedObject holds an int.  A global (not thread safe!) count of
// allocated CountedObjects is maintained to help test memory management.
class CountedObject {
 public:
  explicit CountedObject(int id) : id_(id) { ++count_; }
  ~CountedObject() { --count_; }

  static int count() { return count_; }
  int id() const { return id_; }

 private:
  static int count_;
  int id_;
};

int CountedObject::count_;


typedef int AddressType;
typedef RangeMap< AddressType, linked_ptr<CountedObject> > TestMap;


// RangeTest contains data to use for store and retrieve tests.  See
// RunTests for descriptions of the tests.
struct RangeTest {
  // Base address to use for test
  AddressType address;

  // Size of range to use for test
  AddressType size;

  // Unique ID of range - unstorable ranges must have unique IDs too
  int id;

  // Whether this range is expected to be stored successfully or not
  bool expect_storable;
};


// A RangeTestSet encompasses multiple RangeTests, which are run in
// sequence on the same RangeMap.
struct RangeTestSet {
  // An array of RangeTests
  const RangeTest *range_tests;

  // The number of tests in the set
  unsigned int range_test_count;
};


// StoreTest uses the data in a RangeTest and calls StoreRange on the
// test RangeMap.  It returns true if the expected result occurred, and
// false if something else happened.
static bool StoreTest(TestMap *range_map, const RangeTest *range_test) {
  linked_ptr<CountedObject> object(new CountedObject(range_test->id));
  bool stored = range_map->StoreRange(range_test->address,
                                      range_test->size,
                                      object);

  if (stored != range_test->expect_storable) {
    fprintf(stderr, "FAILED: "
            "StoreRange id %d, expected %s, observed %s\n",
            range_test->id,
            range_test->expect_storable ? "storable" : "not storable",
            stored ? "stored" : "not stored");
    return false;
  }

  return true;
}


// RetrieveTest uses the data in RangeTest and calls RetrieveRange on the
// test RangeMap.  If it retrieves the expected value (which can be no
// map entry at the specified range,) it returns true, otherwise, it returns
// false.  RetrieveTest will check the values around the base address and
// the high address of a range to guard against off-by-one errors.
static bool RetrieveTest(TestMap *range_map, const RangeTest *range_test) {
  for (unsigned int side = 0; side <= 1; ++side) {
    // When side == 0, check the low side (base address) of each range.
    // When side == 1, check the high side (base + size) of each range.

    // Check one-less and one-greater than the target address in addition
    // to the target address itself.

    // If the size of the range is only 1, don't check one greater than
    // the base or one less than the high - for a successfully stored
    // range, these tests would erroneously fail because the range is too
    // small.
    AddressType low_offset = -1;
    AddressType high_offset = 1;
    if (range_test->size == 1) {
      if (!side)          // When checking the low side,
        high_offset = 0;  // don't check one over the target.
      else                // When checking the high side,
        low_offset = 0;   // don't check one under the target.
    }

    for (AddressType offset = low_offset; offset <= high_offset; ++offset) {
      AddressType address =
          offset +
          (!side ? range_test->address :
                   range_test->address + range_test->size - 1);

      bool expected_result = false;  // This is correct for tests not stored.
      if (range_test->expect_storable) {
        if (offset == 0)             // When checking the target address,
          expected_result = true;    // test should always succeed.
        else if (offset == -1)       // When checking one below the target,
          expected_result = side;    // should fail low and succeed high.
        else                         // When checking one above the target,
          expected_result = !side;   // should succeed low and fail high.
      }

      linked_ptr<CountedObject> object;
      AddressType retrieved_base = AddressType();
      AddressType retrieved_size = AddressType();
      bool retrieved = range_map->RetrieveRange(address, &object,
                                                &retrieved_base,
                                                &retrieved_size);

      bool observed_result = retrieved && object->id() == range_test->id;

      if (observed_result != expected_result) {
        fprintf(stderr, "FAILED: "
                        "RetrieveRange id %d, side %d, offset %d, "
                        "expected %s, observed %s\n",
                        range_test->id,
                        side,
                        offset,
                        expected_result ? "true" : "false",
                        observed_result ? "true" : "false");
        return false;
      }

      // If a range was successfully retrieved, check that the returned
      // bounds match the range as stored.
      if (observed_result == true &&
          (retrieved_base != range_test->address ||
           retrieved_size != range_test->size)) {
        fprintf(stderr, "FAILED: "
                        "RetrieveRange id %d, side %d, offset %d, "
                        "expected base/size %d/%d, observed %d/%d\n",
                        range_test->id,
                        side,
                        offset,
                        range_test->address, range_test->size,
                        retrieved_base, retrieved_size);
        return false;
      }

      // Now, check RetrieveNearestRange.  The nearest range is always
      // expected to be different from the test range when checking one
      // less than the low side.
      bool expected_nearest = range_test->expect_storable;
      if (!side && offset < 0)
        expected_nearest = false;

      linked_ptr<CountedObject> nearest_object;
      AddressType nearest_base = AddressType();
      AddressType nearest_size = AddressType();
      bool retrieved_nearest = range_map->RetrieveNearestRange(address,
                                                               &nearest_object,
                                                               &nearest_base,
                                                               &nearest_size);

      // When checking one greater than the high side, RetrieveNearestRange
      // should usually return the test range.  When a different range begins
      // at that address, though, then RetrieveNearestRange should return the
      // range at the address instead of the test range.
      if (side && offset > 0 && nearest_base == address) {
        expected_nearest = false;
      }

      bool observed_nearest = retrieved_nearest &&
                              nearest_object->id() == range_test->id;

      if (observed_nearest != expected_nearest) {
        fprintf(stderr, "FAILED: "
                        "RetrieveNearestRange id %d, side %d, offset %d, "
                        "expected %s, observed %s\n",
                        range_test->id,
                        side,
                        offset,
                        expected_nearest ? "true" : "false",
                        observed_nearest ? "true" : "false");
        return false;
      }

      // If a range was successfully retrieved, check that the returned
      // bounds match the range as stored.
      if (expected_nearest &&
          (nearest_base != range_test->address ||
           nearest_size != range_test->size)) {
        fprintf(stderr, "FAILED: "
                        "RetrieveNearestRange id %d, side %d, offset %d, "
                        "expected base/size %d/%d, observed %d/%d\n",
                        range_test->id,
                        side,
                        offset,
                        range_test->address, range_test->size,
                        nearest_base, nearest_size);
        return false;
      }
    }
  }

  return true;
}


// Test RetrieveRangeAtIndex, which is supposed to return objects in order
// according to their addresses.  This test is performed by looping through
// the map, calling RetrieveRangeAtIndex for all possible indices in sequence,
// and verifying that each call returns a different object than the previous
// call, and that ranges are returned with increasing base addresses.  Returns
// false if the test fails.
static bool RetrieveIndexTest(TestMap *range_map, int set) {
  linked_ptr<CountedObject> object;
  CountedObject *last_object = NULL;
  AddressType last_base = 0;

  int object_count = range_map->GetCount();
  for (int object_index = 0; object_index < object_count; ++object_index) {
    AddressType base;
    if (!range_map->RetrieveRangeAtIndex(object_index, &object, &base, NULL)) {
      fprintf(stderr, "FAILED: RetrieveRangeAtIndex set %d index %d, "
              "expected success, observed failure\n",
              set, object_index);
      return false;
    }

    if (!object.get()) {
      fprintf(stderr, "FAILED: RetrieveRangeAtIndex set %d index %d, "
              "expected object, observed NULL\n",
              set, object_index);
      return false;
    }

    // It's impossible to do these comparisons unless there's a previous
    // object to compare against.
    if (last_object) {
      // The object must be different from the last one.
      if (object->id() == last_object->id()) {
        fprintf(stderr, "FAILED: RetrieveRangeAtIndex set %d index %d, "
                "expected different objects, observed same objects (%d)\n",
                set, object_index, object->id());
        return false;
      }

      // Each object must have a base greater than the previous object's base.
      if (base <= last_base) {
        fprintf(stderr, "FAILED: RetrieveRangeAtIndex set %d index %d, "
                "expected different bases, observed same bases (%d)\n",
                set, object_index, base);
        return false;
      }
    }

    last_object = object.get();
    last_base = base;
  }

  // Make sure that RetrieveRangeAtIndex doesn't allow lookups at indices that
  // are too high.
  if (range_map->RetrieveRangeAtIndex(object_count, &object, NULL, NULL)) {
    fprintf(stderr, "FAILED: RetrieveRangeAtIndex set %d index %d (too large), "
            "expected failure, observed success\n",
            set, object_count);
    return false;
  }

  return true;
}

// Additional RetriveAtIndex test to expose the bug in RetrieveRangeAtIndex().
// Bug info: RetrieveRangeAtIndex() previously retrieves the high address of
// entry, however, it is supposed to retrieve the base address of entry as
// stated in the comment in range_map.h.
static bool RetriveAtIndexTest2() {
  scoped_ptr<TestMap> range_map(new TestMap());

  // Store ranges with base address = 2 * object_id:
  const int range_size = 2;
  for (int object_id = 0; object_id < 100; ++object_id) {
    linked_ptr<CountedObject> object(new CountedObject(object_id));
    int base_address = 2 * object_id;
    range_map->StoreRange(base_address, range_size, object);
  }

  linked_ptr<CountedObject> object;
  int object_count = range_map->GetCount();
  for (int object_index = 0; object_index < object_count; ++object_index) {
    AddressType base;
    if (!range_map->RetrieveRangeAtIndex(object_index, &object, &base, NULL)) {
      fprintf(stderr, "FAILED: RetrieveAtIndexTest2 index %d, "
              "expected success, observed failure\n", object_index);
      return false;
    }

    int expected_base = 2 * object->id();
    if (base != expected_base) {
      fprintf(stderr, "FAILED: RetriveAtIndexTest2 index %d, "
              "expected base %d, observed base %d",
              object_index, expected_base, base);
      return false;
    }
  }

  return true;
}


// RunTests runs a series of test sets.
static bool RunTests() {
  // These tests will be run sequentially.  The first set of tests exercises
  // most functions of RangeTest, and verifies all of the bounds-checking.
  const RangeTest range_tests_0[] = {
    { INT_MIN,     16,      1,  true },   // lowest possible range
    { -2,          5,       2,  true },   // a range through zero
    { INT_MAX - 9, 11,      3,  false },  // tests anti-overflow
    { INT_MAX - 9, 10,      4,  true },   // highest possible range
    { 5,           0,       5,  false },  // tests anti-zero-size
    { 5,           1,       6,  true },   // smallest possible range
    { -20,         15,      7,  true },   // entirely negative

    { 10,          10,      10, true },   // causes the following tests to fail
    { 9,           10,      11, false },  // one-less base, one-less high
    { 9,           11,      12, false },  // one-less base, identical high
    { 9,           12,      13, false },  // completely contains existing
    { 10,          9,       14, false },  // identical base, one-less high
    { 10,          10,      15, false },  // exactly identical to existing range
    { 10,          11,      16, false },  // identical base, one-greater high
    { 11,          8,       17, false },  // contained completely within
    { 11,          9,       18, false },  // one-greater base, identical high
    { 11,          10,      19, false },  // one-greater base, one-greater high
    { 9,           2,       20, false },  // overlaps bottom by one
    { 10,          1,       21, false },  // overlaps bottom by one, contained
    { 19,          1,       22, false },  // overlaps top by one, contained
    { 19,          2,       23, false },  // overlaps top by one

    { 9,           1,       24, true },   // directly below without overlap
    { 20,          1,       25, true },   // directly above without overlap

    { 6,           3,       26, true },   // exactly between two ranges, gapless
    { 7,           3,       27, false },  // tries to span two ranges
    { 7,           5,       28, false },  // tries to span three ranges
    { 4,           20,      29, false },  // tries to contain several ranges

    { 30,          50,      30, true },
    { 90,          25,      31, true },
    { 35,          65,      32, false },  // tries to span two noncontiguous
    { 120,         10000,   33, true },   // > 8-bit
    { 20000,       20000,   34, true },   // > 8-bit
    { 0x10001,     0x10001, 35, true },   // > 16-bit

    { 27,          -1,      36, false }   // tests high < base
  };

  // Attempt to fill the entire space.  The entire space must be filled with
  // three stores because AddressType is signed for these tests, so RangeMap
  // treats the size as signed and rejects sizes that appear to be negative.
  // Even if these tests were run as unsigned, two stores would be needed
  // to fill the space because the entire size of the space could only be
  // described by using one more bit than would be present in AddressType.
  const RangeTest range_tests_1[] = {
    { INT_MIN, INT_MAX, 50, true },   // From INT_MIN to -2, inclusive
    { -1,      2,       51, true },   // From -1 to 0, inclusive
    { 1,       INT_MAX, 52, true },   // From 1 to INT_MAX, inclusive
    { INT_MIN, INT_MAX, 53, false },  // Can't fill the space twice
    { -1,      2,       54, false },
    { 1,       INT_MAX, 55, false },
    { -3,      6,       56, false },  // -3 to 2, inclusive - spans 3 ranges
  };

  // A light round of testing to verify that RetrieveRange does the right
  // the right thing at the extremities of the range when nothing is stored
  // there.  Checks are forced without storing anything at the extremities
  // by setting size = 0.
  const RangeTest range_tests_2[] = {
    { INT_MIN, 0, 100, false },  // makes RetrieveRange check low end
    { -1,      3, 101, true },
    { INT_MAX, 0, 102, false },  // makes RetrieveRange check high end
  };

  // Similar to the previous test set, but with a couple of ranges closer
  // to the extremities.
  const RangeTest range_tests_3[] = {
    { INT_MIN + 1, 1, 110, true },
    { INT_MAX - 1, 1, 111, true },
    { INT_MIN,     0, 112, false },  // makes RetrieveRange check low end
    { INT_MAX,     0, 113, false }   // makes RetrieveRange check high end
  };

  // The range map is cleared between sets of tests listed here.
  const RangeTestSet range_test_sets[] = {
    { range_tests_0, sizeof(range_tests_0) / sizeof(RangeTest) },
    { range_tests_1, sizeof(range_tests_1) / sizeof(RangeTest) },
    { range_tests_2, sizeof(range_tests_2) / sizeof(RangeTest) },
    { range_tests_3, sizeof(range_tests_3) / sizeof(RangeTest) },
    { range_tests_0, sizeof(range_tests_0) / sizeof(RangeTest) }   // Run again
  };

  // Maintain the range map in a pointer so that deletion can be meaningfully
  // tested.
  scoped_ptr<TestMap> range_map(new TestMap());

  // Run all of the test sets in sequence.
  unsigned int range_test_set_count = sizeof(range_test_sets) /
                                      sizeof(RangeTestSet);
  for (unsigned int range_test_set_index = 0;
       range_test_set_index < range_test_set_count;
       ++range_test_set_index) {
    const RangeTest *range_tests =
        range_test_sets[range_test_set_index].range_tests;
    unsigned int range_test_count =
        range_test_sets[range_test_set_index].range_test_count;

    // Run the StoreRange test, which validates StoreRange and initializes
    // the RangeMap with data for the RetrieveRange test.
    int stored_count = 0;  // The number of ranges successfully stored
    for (unsigned int range_test_index = 0;
         range_test_index < range_test_count;
         ++range_test_index) {
      const RangeTest *range_test = &range_tests[range_test_index];
      if (!StoreTest(range_map.get(), range_test))
        return false;

      if (range_test->expect_storable)
        ++stored_count;
    }

    // There should be exactly one CountedObject for everything successfully
    // stored in the RangeMap.
    if (CountedObject::count() != stored_count) {
      fprintf(stderr, "FAILED: "
              "stored object counts don't match, expected %d, observed %d\n",
              stored_count,
              CountedObject::count());

      return false;
    }

    // The RangeMap's own count of objects should also match.
    if (range_map->GetCount() != stored_count) {
      fprintf(stderr, "FAILED: stored object count doesn't match GetCount, "
              "expected %d, observed %d\n",
              stored_count, range_map->GetCount());

      return false;
    }

    // Run the RetrieveRange test
    for (unsigned int range_test_index = 0;
         range_test_index < range_test_count;
         ++range_test_index) {
      const RangeTest *range_test = &range_tests[range_test_index];
      if (!RetrieveTest(range_map.get(), range_test))
        return false;
    }

    if (!RetrieveIndexTest(range_map.get(), range_test_set_index))
      return false;

    // Clear the map between test sets.  If this is the final test set,
    // delete the map instead to test destruction.
    if (range_test_set_index < range_test_set_count - 1)
      range_map->Clear();
    else
      range_map.reset();

    // Test that all stored objects are freed when the RangeMap is cleared
    // or deleted.
    if (CountedObject::count() != 0) {
      fprintf(stderr, "FAILED: "
              "did not free all objects after %s, %d still allocated\n",
              range_test_set_index < range_test_set_count - 1 ? "clear"
                                                              : "delete",
              CountedObject::count());

      return false;
    }
  }

  if (!RetriveAtIndexTest2()) {
    fprintf(stderr, "FAILED: did not pass RetrieveAtIndexTest2()\n");
    return false;
  }

  return true;
}


}  // namespace


int main(int argc, char **argv) {
  BPLOG_INIT(&argc, &argv);

  return RunTests() ? 0 : 1;
}