Light-weight stats counters for experiments.

runtime/vm/counters.cc

Index: runtime/vm/counters.cc
===================================================================
--- runtime/vm/counters.cc	(revision 0)
+++ runtime/vm/counters.cc	(revision 0)
@@ -0,0 +1,40 @@
+// Copyright (c) 2014, 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 "vm/counters.h"
+
+#include <string.h>
+#include <map>

[Ivan Posva, 2014/06/13 22:14:32]

Please add a TODO to remove this.

[koda, 2014/06/16 17:12:48]

Done.

+
+#include "platform/globals.h"
+#include "vm/os.h"
+
+namespace dart {
+
+struct CStrLess {
+  bool operator()(const char* a, const char* b) const {
+    return strcmp(a, b) < 0;
+  }
+};
+
+
+Counters::~Counters() {
+  if (collision_) {
+    OS::PrintErr("Counters table collision; increase Counters::kSize.");
+    return;
+  }
+  typedef std::map<const char*, int64_t, CStrLess> TotalsMap;
+  TotalsMap totals;
+  for (int i = 0; i < kSize; ++i) {
+    const Counter& counter = counters_[i];
+    if (counter.name != NULL) {
+      totals[counter.name] += counter.value;
+    }
+  }
+  for (TotalsMap::iterator it = totals.begin(); it != totals.end(); ++it) {
+    OS::PrintErr("%s: %" Pd64 "\n", it->first, it->second);
+  }
+}
+
+}  // namespace dart