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5886e8ec95
A single statement is enough to add a counter:
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Isolate::Current()->counters()->Increment("allocated", size_in_bytes);
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I've been using these myself for a while now, but figured others might
find them useful too. They are not intended for production use, just temporary local experiments/investigation.
R=johnmccutchan@google.com
Review URL: https://codereview.chromium.org//336683003
git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@37367 260f80e4-7a28-3924-810f-c04153c831b5
52 lines
1.3 KiB
C++
52 lines
1.3 KiB
C++
// Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef VM_COUNTERS_H_
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#define VM_COUNTERS_H_
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#include "platform/assert.h"
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namespace dart {
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struct Counter {
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Counter() : name(NULL), value(0) {}
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const char* name;
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int64_t value;
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};
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// Light-weight stats counters for temporary experiments/debugging.
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// A single statement is enough to add a counter:
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// ...
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// Isolate::Current()->counters()->Increment("allocated", size_in_bytes);
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// ...
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class Counters {
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public:
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Counters() : collision_(false) {}
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// Adds 'delta' to the named counter. 'name' must be a literal string.
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void Increment(const char* name, int64_t delta) {
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Counter& counter =
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counters_[reinterpret_cast<uword>(name) & (kSize - 1)];
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if (counter.name != name && counter.name != NULL) {
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collision_ = true;
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}
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counter.name = name;
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counter.value += delta;
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}
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// Prints all counters to stderr.
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~Counters();
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private:
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enum { kSize = 1024 };
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COMPILE_ASSERT((0 == (kSize & (kSize - 1)))); // kSize is a power of 2.
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Counter counters_[kSize];
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bool collision_;
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};
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} // namespace dart
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#endif // VM_COUNTERS_H_
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