Implemented VLOG() et al.

Implemented VLOG(), VLOG_IF(), VLOG_IS_ON().  Added --v and --vmodule
switches.

Changed some spammy sync-related logs to use VLOG.

BUG=56965
TEST=New unittests

Review URL: http://codereview.chromium.org/3448028

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@60976 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 105 insertions, 0 deletions

diff --git a/base/vlog_unittest.cc b/base/vlog_unittest.cc
new file mode 100644
index 0000000..bb48724
--- /dev/null
+++ b/base/vlog_unittest.cc
@@ -0,0 +1,105 @@
+// Copyright (c) 2010 The Chromium 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 "base/vlog.h"
+
+#include "base/basictypes.h"
+#include "base/logging.h"
+#include "base/time.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace logging {
+
+namespace {
+
+class VlogTest : public testing::Test {
+};
+
+TEST_F(VlogTest, NoVmodule) {
+  EXPECT_EQ(0, VlogInfo("", "").GetVlogLevel("test1"));
+  EXPECT_EQ(0, VlogInfo("0", "").GetVlogLevel("test2"));
+  EXPECT_EQ(0, VlogInfo("blah", "").GetVlogLevel("test3"));
+  EXPECT_EQ(0, VlogInfo("0blah1", "").GetVlogLevel("test4"));
+  EXPECT_EQ(1, VlogInfo("1", "").GetVlogLevel("test5"));
+  EXPECT_EQ(5, VlogInfo("5", "").GetVlogLevel("test6"));
+}
+
+TEST_F(VlogTest, Vmodule) {
+  const char kVSwitch[] = "-1";
+  const char kVModuleSwitch[] =
+      "foo=,bar=0,baz=blah,,qux=0blah1,quux=1,corge=5";
+  VlogInfo vlog_info(kVSwitch, kVModuleSwitch);
+  EXPECT_EQ(-1, vlog_info.GetVlogLevel("/path/to/grault.cc"));
+  EXPECT_EQ(0, vlog_info.GetVlogLevel("/path/to/foo.cc"));
+  EXPECT_EQ(0, vlog_info.GetVlogLevel("D:\\Path\\To\\bar-inl.mm"));
+  EXPECT_EQ(-1, vlog_info.GetVlogLevel("D:\\path\\to what/bar_unittest.m"));
+  EXPECT_EQ(0, vlog_info.GetVlogLevel("baz.h"));
+  EXPECT_EQ(0, vlog_info.GetVlogLevel("/another/path/to/qux.h"));
+  EXPECT_EQ(1, vlog_info.GetVlogLevel("/path/to/quux"));
+  EXPECT_EQ(5, vlog_info.GetVlogLevel("c:\\path/to/corge.h"));
+}
+
+#define BENCHMARK(iters, elapsed, code)                         \
+  do {                                                          \
+    base::TimeTicks start = base::TimeTicks::Now();             \
+    for (int i = 0; i < iters; ++i) code;                       \
+    base::TimeTicks end = base::TimeTicks::Now();               \
+    elapsed = end - start;                                      \
+    double cps = iters / elapsed.InSecondsF();                  \
+    LOG(INFO) << cps << " cps (" << elapsed.InSecondsF()        \
+              << "s elapsed)";                                  \
+  } while (0)
+
+double GetSlowdown(const base::TimeDelta& base,
+                   const base::TimeDelta& elapsed) {
+  return elapsed.InSecondsF() / base.InSecondsF();
+}
+
+
+TEST_F(VlogTest, Perf) {
+  const char* kVlogs[] = {
+    "/path/to/foo.cc",
+    "C:\\path\\to\\bar.h",
+    "/path/to/not-matched.mm",
+    "C:\\path\\to\\baz-inl.mm",
+    "C:\\path\\to\\qux.mm",
+    "/path/to/quux.mm",
+    "/path/to/another-not-matched.mm",
+  };
+  const int kVlogCount = arraysize(kVlogs);
+
+  base::TimeDelta null_elapsed;
+  {
+    VlogInfo null_vlog_info("", "");
+    BENCHMARK(10000000, null_elapsed, {
+      EXPECT_NE(-1, null_vlog_info.GetVlogLevel(kVlogs[i % kVlogCount]));
+    });
+  }
+
+  {
+    VlogInfo small_vlog_info("0", "foo=1,bar=2,baz=3,qux=4,quux=5");
+    base::TimeDelta elapsed;
+    BENCHMARK(10000000, elapsed, {
+      EXPECT_NE(-1, small_vlog_info.GetVlogLevel(kVlogs[i % kVlogCount]));
+    });
+    LOG(INFO) << "slowdown = " << GetSlowdown(null_elapsed, elapsed)
+              << "x";
+  }
+
+  {
+    VlogInfo pattern_vlog_info("0", "fo*=1,ba?=2,b*?z=3,*ux=4,?uux=5");
+    base::TimeDelta elapsed;
+    BENCHMARK(10000000, elapsed, {
+      EXPECT_NE(-1, pattern_vlog_info.GetVlogLevel(kVlogs[i % kVlogCount]));
+    });
+    LOG(INFO) << "slowdown = " << GetSlowdown(null_elapsed, elapsed)
+              << "x";
+  }
+}
+
+#undef BENCHMARK
+
+}  // namespace
+
+}  // namespace logging