[turbofan] basic block profiler

test/cctest/compiler/test-basic-block-profiler.cc

+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "src/v8.h"
+
+#include "src/basic-block-profiler.h"
+#include "test/cctest/cctest.h"
+#include "test/cctest/compiler/codegen-tester.h"
+
+#if V8_TURBOFAN_TARGET
+
+using namespace v8::internal;
+using namespace v8::internal::compiler;
+
+typedef RawMachineAssembler::Label MLabel;
+
+class BasicBlockProfilerTest : public RawMachineAssemblerTester<int32_t> {
+ public:
+  BasicBlockProfilerTest() : RawMachineAssemblerTester<int32_t>(kMachInt32) {
+    FLAG_turbo_profiling = true;
+  }
+
+  void ResetCounts() { isolate()->basic_block_profiler()->ResetCounts(); }
+
+  void Expect(size_t size, uint32_t* expected) {
+    CHECK_NE(NULL, isolate()->basic_block_profiler());
+    const BasicBlockProfiler::DataList* l =
+        isolate()->basic_block_profiler()->data_list();
+    CHECK_NE(0, static_cast<int>(l->size()));
+    const BasicBlockProfiler::Data* data = l->back();
+    CHECK_EQ(static_cast<int>(size), static_cast<int>(data->n_blocks()));
+    const uint32_t* counts = data->counts();
+    for (size_t i = 0; i < size; ++i) {
+      CHECK_EQ(static_cast<int>(expected[i]), static_cast<int>(counts[i]));
+    }
+  }
+};
+
+
+TEST(ProfileDiamond) {
+  BasicBlockProfilerTest m;
+
+  MLabel blocka, blockb, end;
+  m.Branch(m.Parameter(0), &blocka, &blockb);
+  m.Bind(&blocka);
+  m.Goto(&end);
+  m.Bind(&blockb);
+  m.Goto(&end);
+  m.Bind(&end);
+  m.Return(m.Int32Constant(0));
+
+  m.GenerateCode();
+  {
+    uint32_t expected[] = {0, 0, 0, 0};
+    m.Expect(arraysize(expected), expected);
+  }
+
+  m.Call(0);
+  {
+    uint32_t expected[] = {1, 1, 0, 1};
+    m.Expect(arraysize(expected), expected);
+  }
+
+  m.ResetCounts();
+
+  m.Call(1);
+  {
+    uint32_t expected[] = {1, 0, 1, 1};
+    m.Expect(arraysize(expected), expected);
+  }
+
+  m.Call(0);
+  {
+    uint32_t expected[] = {2, 1, 1, 2};
+    m.Expect(arraysize(expected), expected);
+  }
+}
+
+
+TEST(ProfileLoop) {
+  BasicBlockProfilerTest m;
+
+  MLabel header, body, end;
+  Node* one = m.Int32Constant(1);
+  m.Goto(&header);
+
+  m.Bind(&header);
+  Node* count = m.Phi(kMachInt32, m.Parameter(0), one);
+  m.Branch(count, &body, &end);
+
+  m.Bind(&body);
+  count->ReplaceInput(1, m.Int32Sub(count, one));
+  m.Goto(&header);
+
+  m.Bind(&end);
+  m.Return(one);
+
+  m.GenerateCode();
+  {
+    uint32_t expected[] = {0, 0, 0, 0};
+    m.Expect(arraysize(expected), expected);
+  }
+
+  uint32_t runs[] = {0, 1, 500, 10000};
+  for (size_t i = 0; i < arraysize(runs); i++) {
+    m.ResetCounts();
+    CHECK_EQ(1, m.Call(static_cast<int>(runs[i])));
+    uint32_t expected[] = {1, runs[i] + 1, runs[i], 1};
+    m.Expect(arraysize(expected), expected);
+  }
+}
+
+#endif  // V8_TURBOFAN_TARGET