v8/test/cctest/test-gc-tracer.cc

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#include <stdlib.h>
#include <utility>

#include "src/heap/gc-tracer.h"
#include "test/cctest/cctest.h"

using namespace v8::internal;

TEST(RingBufferPartialFill) {
  const int max_size = 6;
  typedef RingBuffer<int, max_size>::const_iterator Iter;
  RingBuffer<int, max_size> ring_buffer;
  CHECK(ring_buffer.empty());
  CHECK_EQ(static_cast<int>(ring_buffer.size()), 0);
  CHECK(ring_buffer.begin() == ring_buffer.end());

  // Fill ring_buffer partially: [0, 1, 2]
  for (int i = 0; i < max_size / 2; i++) ring_buffer.push_back(i);

  CHECK(!ring_buffer.empty());
  CHECK(static_cast<int>(ring_buffer.size()) == max_size / 2);
  CHECK(ring_buffer.begin() != ring_buffer.end());

  // Test forward itartion
  int i = 0;
  for (Iter iter = ring_buffer.begin(); iter != ring_buffer.end(); ++iter) {
    CHECK(*iter == i);
    ++i;
  }
  CHECK_EQ(i, 3);  // one past last element.

  // Test backward iteration
  i = 2;
  Iter iter = ring_buffer.back();
  while (true) {
    CHECK(*iter == i);
    if (iter == ring_buffer.begin()) break;
    --iter;
    --i;
  }
  CHECK_EQ(i, 0);
}


TEST(RingBufferWrapAround) {
  const int max_size = 6;
  typedef RingBuffer<int, max_size>::const_iterator Iter;
  RingBuffer<int, max_size> ring_buffer;

  // Fill ring_buffer (wrap around): [9, 10, 11, 12, 13, 14]
  for (int i = 0; i < 2 * max_size + 3; i++) ring_buffer.push_back(i);

  CHECK(!ring_buffer.empty());
  CHECK(static_cast<int>(ring_buffer.size()) == max_size);
  CHECK(ring_buffer.begin() != ring_buffer.end());

  // Test forward iteration
  int i = 9;
  for (Iter iter = ring_buffer.begin(); iter != ring_buffer.end(); ++iter) {
    CHECK(*iter == i);
    ++i;
  }
  CHECK_EQ(i, 15);  // one past last element.

  // Test backward iteration
  i = 14;
  Iter iter = ring_buffer.back();
  while (true) {
    CHECK(*iter == i);
    if (iter == ring_buffer.begin()) break;
    --iter;
    --i;
  }
  CHECK_EQ(i, 9);
}


TEST(RingBufferPushFront) {
  const int max_size = 6;
  typedef RingBuffer<int, max_size>::const_iterator Iter;
  RingBuffer<int, max_size> ring_buffer;

  // Fill ring_buffer (wrap around): [14, 13, 12, 11, 10, 9]
  for (int i = 0; i < 2 * max_size + 3; i++) ring_buffer.push_front(i);

  CHECK(!ring_buffer.empty());
  CHECK(static_cast<int>(ring_buffer.size()) == max_size);
  CHECK(ring_buffer.begin() != ring_buffer.end());

  // Test forward iteration
  int i = 14;
  for (Iter iter = ring_buffer.begin(); iter != ring_buffer.end(); ++iter) {
    CHECK(*iter == i);
    --i;
  }
  CHECK_EQ(i, 8);  // one past last element.
}