Refactor the ring buffer in GCTracer.

test/cctest/test-gc-tracer.cc

-// Copyright 2014 the V8 project authors. All rights reserved.
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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.
-}