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// address_map_unittest.cc: Unit tests for AddressMap.
//
// Author: Mark Mentovai

#include <climits>
#include <cstdio>

#include "processor/address_map-inl.h"
#include "processor/linked_ptr.h"
#include "processor/logging.h"

#define ASSERT_TRUE(condition) \
  if (!(condition)) { \
    fprintf(stderr, "FAIL: %s @ %s:%d\n", #condition, __FILE__, __LINE__); \
    return false; \
  }

#define ASSERT_FALSE(condition) ASSERT_TRUE(!(condition))

#define ASSERT_EQ(e1, e2) ASSERT_TRUE((e1) == (e2))

namespace {

using google_breakpad::AddressMap;
using google_breakpad::linked_ptr;

// 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 AddressMap< AddressType, linked_ptr<CountedObject> > TestMap;

static bool DoAddressMapTest() {
  ASSERT_EQ(CountedObject::count(), 0);

  TestMap test_map;
  linked_ptr<CountedObject> entry;
  AddressType address;

  // Check that a new map is truly empty.
  ASSERT_FALSE(test_map.Retrieve(0, &entry, &address));
  ASSERT_FALSE(test_map.Retrieve(INT_MIN, &entry, &address));
  ASSERT_FALSE(test_map.Retrieve(INT_MAX, &entry, &address));

  // Check that Clear clears the map without leaking.
  ASSERT_EQ(CountedObject::count(), 0);
  ASSERT_TRUE(test_map.Store(1,
      linked_ptr<CountedObject>(new CountedObject(0))));
  ASSERT_TRUE(test_map.Retrieve(1, &entry, &address));
  ASSERT_EQ(CountedObject::count(), 1);
  test_map.Clear();
  ASSERT_EQ(CountedObject::count(), 1);  // still holding entry in this scope

  // Check that a cleared map is truly empty.
  ASSERT_FALSE(test_map.Retrieve(0, &entry, &address));
  ASSERT_FALSE(test_map.Retrieve(INT_MIN, &entry, &address));
  ASSERT_FALSE(test_map.Retrieve(INT_MAX, &entry, &address));

  // Check a single-element map.
  ASSERT_TRUE(test_map.Store(10,
      linked_ptr<CountedObject>(new CountedObject(1))));
  ASSERT_FALSE(test_map.Retrieve(9, &entry, &address));
  ASSERT_TRUE(test_map.Retrieve(10, &entry, &address));
  ASSERT_EQ(CountedObject::count(), 1);
  ASSERT_EQ(entry->id(), 1);
  ASSERT_EQ(address, 10);
  ASSERT_TRUE(test_map.Retrieve(11, &entry, &address));
  ASSERT_TRUE(test_map.Retrieve(11, &entry, NULL));     // NULL ok here

  // Add some more elements.
  ASSERT_TRUE(test_map.Store(5,
      linked_ptr<CountedObject>(new CountedObject(2))));
  ASSERT_EQ(CountedObject::count(), 2);
  ASSERT_TRUE(test_map.Store(20,
      linked_ptr<CountedObject>(new CountedObject(3))));
  ASSERT_TRUE(test_map.Store(15,
      linked_ptr<CountedObject>(new CountedObject(4))));
  ASSERT_FALSE(test_map.Store(10,
      linked_ptr<CountedObject>(new CountedObject(5))));  // already in map
  ASSERT_TRUE(test_map.Store(16,
      linked_ptr<CountedObject>(new CountedObject(6))));
  ASSERT_TRUE(test_map.Store(14,
      linked_ptr<CountedObject>(new CountedObject(7))));

  // Nothing was stored with a key under 5.  Don't use ASSERT inside loops
  // because it won't show exactly which key/entry/address failed.
  for (AddressType key = 0; key < 5; ++key) {
    if (test_map.Retrieve(key, &entry, &address)) {
      fprintf(stderr,
              "FAIL: retrieve %d expected false observed true @ %s:%d\n",
              key, __FILE__, __LINE__);
      return false;
    }
  }

  // Check everything that was stored.
  const int id_verify[] = { 0, 0, 0, 0, 0,    // unused
                            2, 2, 2, 2, 2,    // 5 - 9
                            1, 1, 1, 1, 7,    // 10 - 14
                            4, 6, 6, 6, 6,    // 15 - 19
                            3, 3, 3, 3, 3,    // 20 - 24
                            3, 3, 3, 3, 3 };  // 25 - 29
  const AddressType address_verify[] = {  0,  0,  0,  0,  0,    // unused
                                          5,  5,  5,  5,  5,    // 5 - 9
                                         10, 10, 10, 10, 14,    // 10 - 14
                                         15, 16, 16, 16, 16,    // 15 - 19
                                         20, 20, 20, 20, 20,    // 20 - 24
                                         20, 20, 20, 20, 20 };  // 25 - 29

  for (AddressType key = 5; key < 30; ++key) {
    if (!test_map.Retrieve(key, &entry, &address)) {
      fprintf(stderr,
              "FAIL: retrieve %d expected true observed false @ %s:%d\n",
              key, __FILE__, __LINE__);
      return false;
    }
    if (entry->id() != id_verify[key]) {
      fprintf(stderr,
              "FAIL: retrieve %d expected entry %d observed %d @ %s:%d\n",
              key, id_verify[key], entry->id(), __FILE__, __LINE__);
      return false;
    }
    if (address != address_verify[key]) {
      fprintf(stderr,
              "FAIL: retrieve %d expected address %d observed %d @ %s:%d\n",
              key, address_verify[key], address, __FILE__, __LINE__);
      return false;
    }
  }

  // The stored objects should still be in the map.
  ASSERT_EQ(CountedObject::count(), 6);

  return true;
}

static bool RunTests() {
  if (!DoAddressMapTest())
    return false;

  // Leak check.
  ASSERT_EQ(CountedObject::count(), 0);

  return true;
}

}  // namespace

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

  return RunTests() ? 0 : 1;
}
