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// Copyright (c) 2016, 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_shrink_down_unittest.cc: Unit tests for RangeMap that specifically
// test shrink down when ranges overlap.
//
// Author: Ivan Penkov
#include <limits.h>
#include <stdio.h>
#include "processor/range_map-inl.h"
#include "breakpad_googletest_includes.h"
#include "processor/linked_ptr.h"
#include "processor/logging.h"
namespace {
using google_breakpad::linked_ptr;
using google_breakpad::MergeRangeStrategy;
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;
// Same range cannot be stored wice.
TEST(RangeMapTruncateUpper, SameRange) {
TestMap range_map;
range_map.SetMergeStrategy(MergeRangeStrategy::kTruncateUpper);
linked_ptr<CountedObject> object_1(new CountedObject(1));
EXPECT_TRUE(range_map.StoreRange(0 /* base address */, 100 /* size */,
object_1));
// Same range cannot be stored wice.
linked_ptr<CountedObject> object_2(new CountedObject(2));
EXPECT_FALSE(range_map.StoreRange(0 /* base address */, 100 /* size */,
object_2));
}
// If a range is completely contained by another range, then the larger range
// should be shrinked down.
TEST(RangeMapTruncateUpper, CompletelyContained) {
TestMap range_map;
range_map.SetMergeStrategy(MergeRangeStrategy::kTruncateUpper);
// Larger range is added first.
linked_ptr<CountedObject> object_1(new CountedObject(1));
EXPECT_TRUE(range_map.StoreRange(0 /* base address */, 100 /* size */,
object_1));
// Smaller (contained) range is added second.
linked_ptr<CountedObject> object_2(new CountedObject(2));
EXPECT_TRUE(range_map.StoreRange(10 /* base address */, 80 /* size */,
object_2));
linked_ptr<CountedObject> object;
AddressType retrieved_base = AddressType();
AddressType retrieved_delta = AddressType();
AddressType retrieved_size = AddressType();
// The first range contains the second, so the first range should have been
// shrunk to [90, 99]. Range [0, 9] should be free.
EXPECT_FALSE(range_map.RetrieveRange(0, &object, &retrieved_base,
&retrieved_delta, &retrieved_size));
EXPECT_FALSE(range_map.RetrieveRange(9, &object, &retrieved_base,
&retrieved_delta, &retrieved_size));
EXPECT_TRUE(range_map.RetrieveRange(90, &object, &retrieved_base,
&retrieved_delta, &retrieved_size));
EXPECT_EQ(1, object->id());
EXPECT_EQ(90, retrieved_base);
EXPECT_EQ(90, retrieved_delta);
EXPECT_EQ(10, retrieved_size);
// Validate the properties of the smaller range (should be untouched).
EXPECT_TRUE(range_map.RetrieveRange(10, &object, &retrieved_base,
&retrieved_delta, &retrieved_size));
EXPECT_EQ(2, object->id());
EXPECT_EQ(10, retrieved_base);
EXPECT_EQ(0, retrieved_delta);
EXPECT_EQ(80, retrieved_size);
}
// Same as the previous test, however the larger range is added second.
TEST(RangeMapTruncateUpper, CompletelyContained_LargerAddedSecond) {
TestMap range_map;
range_map.SetMergeStrategy(MergeRangeStrategy::kTruncateUpper);
// Smaller (contained) range is added first.
linked_ptr<CountedObject> object_1(new CountedObject(1));
EXPECT_TRUE(range_map.StoreRange(10 /* base address */, 80 /* size */,
object_1));
// Larger range is added second.
linked_ptr<CountedObject> object_2(new CountedObject(2));
EXPECT_TRUE(range_map.StoreRange(0 /* base address */, 100 /* size */,
object_2));
linked_ptr<CountedObject> object;
AddressType retrieved_base = AddressType();
AddressType retrieved_delta = AddressType();
AddressType retrieved_size = AddressType();
// The second range contains the first, so the second range should have been
// shrunk to [90, 99]. Range [0, 9] should be free.
EXPECT_FALSE(range_map.RetrieveRange(0, &object, &retrieved_base,
&retrieved_delta, &retrieved_size));
EXPECT_FALSE(range_map.RetrieveRange(9, &object, &retrieved_base,
&retrieved_delta, &retrieved_size));
EXPECT_TRUE(range_map.RetrieveRange(90, &object, &retrieved_base,
&retrieved_delta, &retrieved_size));
EXPECT_EQ(2, object->id());
EXPECT_EQ(90, retrieved_base);
EXPECT_EQ(90, retrieved_delta);
EXPECT_EQ(10, retrieved_size);
// Validate the properties of the smaller range (should be untouched).
EXPECT_TRUE(range_map.RetrieveRange(10, &object, &retrieved_base,
&retrieved_delta, &retrieved_size));
EXPECT_EQ(1, object->id());
EXPECT_EQ(10, retrieved_base);
EXPECT_EQ(0, retrieved_delta);
EXPECT_EQ(80, retrieved_size);
}
TEST(RangeMapTruncateUpper, PartialOverlap_AtBeginning) {
TestMap range_map;
range_map.SetMergeStrategy(MergeRangeStrategy::kTruncateUpper);
linked_ptr<CountedObject> object_1(new CountedObject(1));
EXPECT_TRUE(range_map.StoreRange(0 /* base address */, 100 /* size */,
object_1));
// Partial overlap at the beginning of the new range.
linked_ptr<CountedObject> object_2(new CountedObject(2));
EXPECT_TRUE(range_map.StoreRange(90 /* base address */, 110 /* size */,
object_2));
linked_ptr<CountedObject> object;
AddressType retrieved_base = AddressType();
AddressType retrieved_delta = AddressType();
AddressType retrieved_size = AddressType();
// The second range is supposed to be shrunk down so the following address
// should resize in the first range.
EXPECT_TRUE(range_map.RetrieveRange(99, &object, &retrieved_base,
&retrieved_delta, &retrieved_size));
EXPECT_EQ(1, object->id());
EXPECT_EQ(0, retrieved_base);
EXPECT_EQ(0, retrieved_delta);
EXPECT_EQ(100, retrieved_size);
// Validate the properties of the shrunk down range.
EXPECT_TRUE(range_map.RetrieveRange(100, &object, &retrieved_base,
&retrieved_delta, &retrieved_size));
EXPECT_EQ(2, object->id());
EXPECT_EQ(100, retrieved_base);
EXPECT_EQ(10, retrieved_delta);
EXPECT_EQ(100, retrieved_size);
}
TEST(RangeMapTruncateUpper, PartialOverlap_AtEnd) {
TestMap range_map;
range_map.SetMergeStrategy(MergeRangeStrategy::kTruncateUpper);
linked_ptr<CountedObject> object_1(new CountedObject(1));
EXPECT_TRUE(range_map.StoreRange(50 /* base address */, 50 /* size */,
object_1));
// Partial overlap at the end of the new range.
linked_ptr<CountedObject> object_2(new CountedObject(2));
EXPECT_TRUE(range_map.StoreRange(0 /* base address */, 70 /* size */,
object_2));
linked_ptr<CountedObject> object;
AddressType retrieved_base = AddressType();
AddressType retrieved_delta = AddressType();
AddressType retrieved_size = AddressType();
// The first range is supposed to be shrunk down so the following address
// should resize in the first range.
EXPECT_TRUE(range_map.RetrieveRange(69, &object, &retrieved_base,
&retrieved_delta, &retrieved_size));
EXPECT_EQ(2, object->id());
EXPECT_EQ(0, retrieved_base);
EXPECT_EQ(0, retrieved_delta);
EXPECT_EQ(70, retrieved_size);
// Validate the properties of the shrunk down range.
EXPECT_TRUE(range_map.RetrieveRange(70, &object, &retrieved_base,
&retrieved_delta, &retrieved_size));
EXPECT_EQ(1, object->id());
EXPECT_EQ(70, retrieved_base);
EXPECT_EQ(20, retrieved_delta);
EXPECT_EQ(30, retrieved_size);
}
// A new range is overlapped at both ends. The new range and the range
// that overlaps at the end should be shrink. The range that overlaps at the
// beginning should be left untouched.
TEST(RangeMapTruncateUpper, OverlapAtBothEnds) {
TestMap range_map;
range_map.SetMergeStrategy(MergeRangeStrategy::kTruncateUpper);
// This should overlap object_3 at the beginning.
linked_ptr<CountedObject> object_1(new CountedObject(1));
EXPECT_TRUE(range_map.StoreRange(0 /* base address */, 100 /* size */,
object_1));
// This should overlap object_3 at the end.
linked_ptr<CountedObject> object_2(new CountedObject(2));
EXPECT_TRUE(range_map.StoreRange(100 /* base address */, 100 /* size */,
object_2));
// This should be overlapped on both ends by object_1 and object_2.
linked_ptr<CountedObject> object_3(new CountedObject(3));
EXPECT_TRUE(range_map.StoreRange(50 /* base address */, 100 /* size */,
object_3));
linked_ptr<CountedObject> object;
AddressType retrieved_base = AddressType();
AddressType retrieved_delta = AddressType();
AddressType retrieved_size = AddressType();
// The first range should be intact.
EXPECT_TRUE(range_map.RetrieveRange(0, &object, &retrieved_base,
&retrieved_delta, &retrieved_size));
EXPECT_EQ(1, object->id());
EXPECT_EQ(0, retrieved_base);
EXPECT_EQ(0, retrieved_delta);
EXPECT_EQ(100, retrieved_size);
// The second range should be shrunk down by 50.
EXPECT_TRUE(range_map.RetrieveRange(150, &object, &retrieved_base,
&retrieved_delta, &retrieved_size));
EXPECT_EQ(2, object->id());
EXPECT_EQ(150, retrieved_base);
EXPECT_EQ(50, retrieved_delta);
EXPECT_EQ(50, retrieved_size);
// The third range (in the middle) should be shrunk down by 50.
EXPECT_TRUE(range_map.RetrieveRange(100, &object, &retrieved_base,
&retrieved_delta, &retrieved_size));
EXPECT_EQ(3, object->id());
EXPECT_EQ(100, retrieved_base);
EXPECT_EQ(50, retrieved_delta);
EXPECT_EQ(50, retrieved_size);
}
TEST(RangeMapTruncateUpper, MultipleConflicts) {
TestMap range_map;
range_map.SetMergeStrategy(MergeRangeStrategy::kTruncateUpper);
// This should overlap with object_3.
linked_ptr<CountedObject> object_1(new CountedObject(1));
EXPECT_TRUE(range_map.StoreRange(10 /* base address */, 90 /* size */,
object_1));
// This should also overlap with object_3 but after object_1.
linked_ptr<CountedObject> object_2(new CountedObject(2));
EXPECT_TRUE(range_map.StoreRange(100 /* base address */, 100 /* size */,
object_2));
// This should be overlapped on both object_1 and object_2. Since
// object_3 ends with the higher address it must be shrunk.
linked_ptr<CountedObject> object_3(new CountedObject(3));
EXPECT_TRUE(range_map.StoreRange(0 /* base address */, 300 /* size */,
object_3));
linked_ptr<CountedObject> object;
AddressType retrieved_base = AddressType();
AddressType retrieved_delta = AddressType();
AddressType retrieved_size = AddressType();
// The first range should be intact.
EXPECT_TRUE(range_map.RetrieveRange(99, &object, &retrieved_base,
&retrieved_delta, &retrieved_size));
EXPECT_EQ(1, object->id());
EXPECT_EQ(10, retrieved_base);
EXPECT_EQ(0, retrieved_delta);
EXPECT_EQ(90, retrieved_size);
// The second range should be intact.
EXPECT_TRUE(range_map.RetrieveRange(199, &object, &retrieved_base,
&retrieved_delta, &retrieved_size));
EXPECT_EQ(2, object->id());
EXPECT_EQ(100, retrieved_base);
EXPECT_EQ(0, retrieved_delta);
EXPECT_EQ(100, retrieved_size);
// The third range should be shrunk down by 200.
EXPECT_TRUE(range_map.RetrieveRange(299, &object, &retrieved_base,
&retrieved_delta, &retrieved_size));
EXPECT_EQ(3, object->id());
EXPECT_EQ(200, retrieved_base);
EXPECT_EQ(200, retrieved_delta);
EXPECT_EQ(100, retrieved_size);
}
// Adding two ranges without overlap should succeed and the ranges should
// be left intact.
TEST(RangeMapTruncateUpper, NoConflicts) {
TestMap range_map;
range_map.SetMergeStrategy(MergeRangeStrategy::kTruncateUpper);
// Adding range 1.
linked_ptr<CountedObject> object_1(new CountedObject(1));
EXPECT_TRUE(range_map.StoreRange(10 /* base address */, 90 /* size */,
object_1));
// Adding range 2 - no overlap with range 1.
linked_ptr<CountedObject> object_2(new CountedObject(2));
EXPECT_TRUE(range_map.StoreRange(110 /* base address */, 90 /* size */,
object_2));
linked_ptr<CountedObject> object;
AddressType retrieved_base = AddressType();
AddressType retrieved_delta = AddressType();
AddressType retrieved_size = AddressType();
// The first range should be intact.
EXPECT_TRUE(range_map.RetrieveRange(99, &object, &retrieved_base,
&retrieved_delta, &retrieved_size));
EXPECT_EQ(1, object->id());
EXPECT_EQ(10, retrieved_base);
EXPECT_EQ(0, retrieved_delta);
EXPECT_EQ(90, retrieved_size);
// The second range should be intact.
EXPECT_TRUE(range_map.RetrieveRange(199, &object, &retrieved_base,
&retrieved_delta, &retrieved_size));
EXPECT_EQ(2, object->id());
EXPECT_EQ(110, retrieved_base);
EXPECT_EQ(0, retrieved_delta);
EXPECT_EQ(90, retrieved_size);
}
} // namespace