Sampling profiler

runtime/vm/profiler_test.cc

+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#include "platform/assert.h"
+
+#include "vm/dart_api_impl.h"
+#include "vm/dart_api_state.h"
+#include "vm/globals.h"
+#include "vm/profiler.h"
+#include "vm/unit_test.h"
+
+namespace dart {
+
+class ProfileSampleBufferTestHelper {
+ public:
+  static intptr_t IterateCount(const SampleBuffer& sample_buffer) {
+    intptr_t c = 0;
+    for (Sample* i = sample_buffer.FirstSample();
+         i != sample_buffer.LastSample();
+         i = sample_buffer.NextSample(i)) {
+      c++;
+    }
+    return c;
+  }
+
+
+  static intptr_t IterateSumPC(const SampleBuffer& sample_buffer) {
+    intptr_t c = 0;
+    for (Sample* i = sample_buffer.FirstSample();
+         i != sample_buffer.LastSample();
+         i = sample_buffer.NextSample(i)) {
+      c += i->pcs[0];
+    }
+    return c;
+  }
+};
+
+
+TEST_CASE(ProfilerSampleBufferWrapTest) {
+  SampleBuffer sample_buffer = SampleBuffer(3);
+  EXPECT_EQ(0, ProfileSampleBufferTestHelper::IterateSumPC(sample_buffer));
+  Sample* s;
+  s = sample_buffer.ReserveSample();
+  s->pcs[0] = 2;
+  EXPECT_EQ(2, ProfileSampleBufferTestHelper::IterateSumPC(sample_buffer));
+  s = sample_buffer.ReserveSample();
+  s->pcs[0] = 4;
+  EXPECT_EQ(6, ProfileSampleBufferTestHelper::IterateSumPC(sample_buffer));
+  s = sample_buffer.ReserveSample();
+  s->pcs[0] = 6;
+  EXPECT_EQ(10, ProfileSampleBufferTestHelper::IterateSumPC(sample_buffer));
+  s = sample_buffer.ReserveSample();
+  s->pcs[0] = 8;
+  EXPECT_EQ(14, ProfileSampleBufferTestHelper::IterateSumPC(sample_buffer));
+}
+
+
+TEST_CASE(ProfilerSampleBufferIterateTest) {
+  SampleBuffer sample_buffer = SampleBuffer(3);
+  EXPECT_EQ(0, ProfileSampleBufferTestHelper::IterateCount(sample_buffer));
+  sample_buffer.ReserveSample();
+  EXPECT_EQ(1, ProfileSampleBufferTestHelper::IterateCount(sample_buffer));
+  sample_buffer.ReserveSample();
+  EXPECT_EQ(2, ProfileSampleBufferTestHelper::IterateCount(sample_buffer));
+  sample_buffer.ReserveSample();
+  EXPECT_EQ(2, ProfileSampleBufferTestHelper::IterateCount(sample_buffer));
+  sample_buffer.ReserveSample();
+  EXPECT_EQ(2, ProfileSampleBufferTestHelper::IterateCount(sample_buffer));
+}
+
+}  // namespace dart