test-hashmap.cc

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// Copyright 2008 the V8 project authors. All rights reserved.
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#include <stdlib.h>

#include "v8.h"
#include "hashmap.h"
#include "cctest.h"

using namespace v8::internal;

static bool DefaultMatchFun(void* a, void* b) {
  return a == b;
}


typedef uint32_t (*IntKeyHash)(uint32_t key);


class IntSet {
 public:
  explicit IntSet(IntKeyHash hash) : hash_(hash), map_(DefaultMatchFun)  {}

  void Insert(int x) {
    CHECK_NE(0, x);  // 0 corresponds to (void*)NULL - illegal key value
    HashMap::Entry* p = map_.Lookup(reinterpret_cast<void*>(x), hash_(x), true);
    CHECK(p != NULL);  // insert is set!
    CHECK_EQ(reinterpret_cast<void*>(x), p->key);
    // we don't care about p->value
  }

  void Remove(int x) {
    CHECK_NE(0, x);  // 0 corresponds to (void*)NULL - illegal key value
    map_.Remove(reinterpret_cast<void*>(x), hash_(x));
  }

  bool Present(int x) {
    HashMap::Entry* p =
        map_.Lookup(reinterpret_cast<void*>(x), hash_(x), false);
    if (p != NULL) {
      CHECK_EQ(reinterpret_cast<void*>(x), p->key);
    }
    return p != NULL;
  }

  void Clear() {
    map_.Clear();
  }

  uint32_t occupancy() const {
    uint32_t count = 0;
    for (HashMap::Entry* p = map_.Start(); p != NULL; p = map_.Next(p)) {
      count++;
    }
    CHECK_EQ(map_.occupancy(), static_cast<double>(count));
    return count;
  }

 private:
  IntKeyHash hash_;
  HashMap map_;
};


static uint32_t Hash(uint32_t key)  { return 23; }
static uint32_t CollisionHash(uint32_t key)  { return key & 0x3; }


void TestSet(IntKeyHash hash, int size) {
  IntSet set(hash);
  CHECK_EQ(0, set.occupancy());

  set.Insert(1);
  set.Insert(2);
  set.Insert(3);
  CHECK_EQ(3, set.occupancy());

  set.Insert(2);
  set.Insert(3);
  CHECK_EQ(3, set.occupancy());

  CHECK(set.Present(1));
  CHECK(set.Present(2));
  CHECK(set.Present(3));
  CHECK(!set.Present(4));
  CHECK_EQ(3, set.occupancy());

  set.Remove(1);
  CHECK(!set.Present(1));
  CHECK(set.Present(2));
  CHECK(set.Present(3));
  CHECK_EQ(2, set.occupancy());

  set.Remove(3);
  CHECK(!set.Present(1));
  CHECK(set.Present(2));
  CHECK(!set.Present(3));
  CHECK_EQ(1, set.occupancy());

  set.Clear();
  CHECK_EQ(0, set.occupancy());

  // Insert a long series of values.
  const int start = 453;
  const int factor = 13;
  const int offset = 7;
  const uint32_t n = size;

  int x = start;
  for (uint32_t i = 0; i < n; i++) {
    CHECK_EQ(i, static_cast<double>(set.occupancy()));
    set.Insert(x);
    x = x * factor + offset;
  }
  CHECK_EQ(n, static_cast<double>(set.occupancy()));

  // Verify the same sequence of values.
  x = start;
  for (uint32_t i = 0; i < n; i++) {
    CHECK(set.Present(x));
    x = x * factor + offset;
  }
  CHECK_EQ(n, static_cast<double>(set.occupancy()));

  // Remove all these values.
  x = start;
  for (uint32_t i = 0; i < n; i++) {
    CHECK_EQ(n - i, static_cast<double>(set.occupancy()));
    CHECK(set.Present(x));
    set.Remove(x);
    CHECK(!set.Present(x));
    x = x * factor + offset;

    // Verify the the expected values are still there.
    int y = start;
    for (uint32_t j = 0; j < n; j++) {
      if (j <= i) {
        CHECK(!set.Present(y));
      } else {
        CHECK(set.Present(y));
      }
      y = y * factor + offset;
    }
  }
  CHECK_EQ(0, set.occupancy());
}


TEST(Set) {
  TestSet(Hash, 100);
  TestSet(CollisionHash, 50);
}