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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkTDynamicHash.h"
#include "SkTypes.h"
#include "Test.h"
#include <cstring>
namespace {
struct Entry {
int key;
double value;
static const int& GetKey(const Entry& entry) { return entry.key; }
static uint32_t Hash(const int& key) { return key; }
};
class Hash : public SkTDynamicHash<Entry, int> {
public:
Hash() : INHERITED() {}
// Promote protected methods to public for this test.
int capacity() const { return this->INHERITED::capacity(); }
int countCollisions(const int& key) const { return this->INHERITED::countCollisions(key); }
private:
typedef SkTDynamicHash<Entry, int> INHERITED;
};
} // namespace
#define ASSERT(x) REPORTER_ASSERT(reporter, x)
DEF_TEST(DynamicHash_growth, reporter) {
Entry a = { 1, 2.0 };
Entry b = { 2, 3.0 };
Entry c = { 3, 4.0 };
Entry d = { 4, 5.0 };
Entry e = { 5, 6.0 };
Hash hash;
ASSERT(hash.capacity() == 0);
hash.add(&a);
ASSERT(hash.capacity() == 4);
hash.add(&b);
ASSERT(hash.capacity() == 4);
hash.add(&c);
ASSERT(hash.capacity() == 4);
hash.add(&d);
ASSERT(hash.capacity() == 8);
hash.add(&e);
ASSERT(hash.capacity() == 8);
ASSERT(hash.count() == 5);
}
DEF_TEST(DynamicHash_growth_bounded, reporter) {
Entry a = { 1, 2.0 };
Entry b = { 2, 3.0 };
Entry c = { 3, 4.0 };
Entry d = { 4, 5.0 };
Entry e = { 5, 6.0 };
Hash hash;
ASSERT(hash.capacity() == 0);
hash.add(&a);
ASSERT(hash.capacity() == 4);
hash.remove(a.key);
hash.add(&b);
ASSERT(hash.capacity() == 4);
hash.remove(b.key);
hash.add(&c);
ASSERT(hash.capacity() == 4);
hash.remove(c.key);
hash.add(&d);
ASSERT(hash.capacity() == 4);
hash.remove(d.key);
hash.add(&e);
ASSERT(hash.capacity() == 4);
ASSERT(hash.count() == 1);
}
DEF_TEST(DynamicHash_add, reporter) {
Hash hash;
Entry a = { 1, 2.0 };
Entry b = { 2, 3.0 };
ASSERT(hash.count() == 0);
hash.add(&a);
ASSERT(hash.count() == 1);
hash.add(&b);
ASSERT(hash.count() == 2);
}
DEF_TEST(DynamicHash_lookup, reporter) {
Hash hash;
// These collide.
Entry a = { 1, 2.0 };
Entry b = { 5, 3.0 };
// Before we insert anything, nothing can collide.
ASSERT(hash.countCollisions(1) == 0);
ASSERT(hash.countCollisions(5) == 0);
ASSERT(hash.countCollisions(9) == 0);
// First is easy.
hash.add(&a);
ASSERT(hash.countCollisions(1) == 0);
ASSERT(hash.countCollisions(5) == 1);
ASSERT(hash.countCollisions(9) == 1);
// Second is one step away.
hash.add(&b);
ASSERT(hash.countCollisions(1) == 0);
ASSERT(hash.countCollisions(5) == 1);
ASSERT(hash.countCollisions(9) == 2);
// We can find our data right?
ASSERT(hash.find(1) != nullptr);
ASSERT(hash.find(1)->value == 2.0);
ASSERT(hash.find(5) != nullptr);
ASSERT(hash.find(5)->value == 3.0);
// These aren't in the hash.
ASSERT(hash.find(2) == nullptr);
ASSERT(hash.find(9) == nullptr);
}
DEF_TEST(DynamicHash_remove, reporter) {
Hash hash;
// These collide.
Entry a = { 1, 2.0 };
Entry b = { 5, 3.0 };
Entry c = { 9, 4.0 };
hash.add(&a);
hash.add(&b);
hash.remove(1);
// a should be marked deleted, and b should still be findable.
ASSERT(hash.find(1) == nullptr);
ASSERT(hash.find(5) != nullptr);
ASSERT(hash.find(5)->value == 3.0);
// This will go in the same slot as 'a' did before.
ASSERT(hash.countCollisions(9) == 0);
hash.add(&c);
ASSERT(hash.find(9) != nullptr);
ASSERT(hash.find(9)->value == 4.0);
ASSERT(hash.find(5) != nullptr);
ASSERT(hash.find(5)->value == 3.0);
}
template<typename T> static void TestIter(skiatest::Reporter* reporter) {
Hash hash;
int count = 0;
// this should fall out of loop immediately
for (T iter(&hash); !iter.done(); ++iter) {
++count;
}
ASSERT(0 == count);
// These collide.
Entry a = { 1, 2.0 };
Entry b = { 5, 3.0 };
Entry c = { 9, 4.0 };
hash.add(&a);
hash.add(&b);
hash.add(&c);
// should see all 3 unique keys when iterating over hash
count = 0;
int keys[3] = {0, 0, 0};
for (T iter(&hash); !iter.done(); ++iter) {
int key = (*iter).key;
keys[count] = key;
ASSERT(hash.find(key) != nullptr);
++count;
}
ASSERT(3 == count);
ASSERT(keys[0] != keys[1]);
ASSERT(keys[0] != keys[2]);
ASSERT(keys[1] != keys[2]);
// should see 2 unique keys when iterating over hash that aren't 1
hash.remove(1);
count = 0;
memset(keys, 0, sizeof(keys));
for (T iter(&hash); !iter.done(); ++iter) {
int key = (*iter).key;
keys[count] = key;
ASSERT(key != 1);
ASSERT(hash.find(key) != nullptr);
++count;
}
ASSERT(2 == count);
ASSERT(keys[0] != keys[1]);
}
DEF_TEST(DynamicHash_iterator, reporter) {
TestIter<Hash::Iter>(reporter);
TestIter<Hash::ConstIter>(reporter);
}
static void TestResetOrRewind(skiatest::Reporter* reporter, bool testReset) {
Hash hash;
Entry a = { 1, 2.0 };
Entry b = { 2, 3.0 };
ASSERT(hash.capacity() == 0);
hash.add(&a);
hash.add(&b);
ASSERT(hash.count() == 2);
ASSERT(hash.capacity() == 4);
if (testReset) {
hash.reset();
ASSERT(hash.capacity() == 0);
} else {
hash.rewind();
ASSERT(hash.capacity() == 4);
}
ASSERT(hash.count() == 0);
// make sure things still work
hash.add(&a);
hash.add(&b);
ASSERT(hash.count() == 2);
ASSERT(hash.capacity() == 4);
ASSERT(hash.find(1) != nullptr);
ASSERT(hash.find(2) != nullptr);
}
DEF_TEST(DynamicHash_reset, reporter) {
TestResetOrRewind(reporter, true);
}
DEF_TEST(DynamicHash_rewind, reporter) {
TestResetOrRewind(reporter, false);
}
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