johnmccutchan@google.com
97ef50a1b2
R=asiva@google.com Review URL: https://codereview.chromium.org//19870006 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@25726 260f80e4-7a28-3924-810f-c04153c831b5
77 lines
2.0 KiB
C++
77 lines
2.0 KiB
C++
// Copyright (c) 2013, 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_HEAP_HISTOGRAM_H_
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#define VM_HEAP_HISTOGRAM_H_
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#include "platform/assert.h"
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#include "vm/flags.h"
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#include "vm/globals.h"
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#include "vm/raw_object.h"
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namespace dart {
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class JSONStream;
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DECLARE_FLAG(bool, print_object_histogram);
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// ObjectHistogram is used to compute an average object histogram over
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// the lifetime of an isolate and then print the histogram when the isolate
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// is shut down. Information is gathered at the back-edge of each major GC
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// event. When an object histogram is collected for an isolate, an extra major
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// GC is performed just prior to shutdown.
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class ObjectHistogram {
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public:
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explicit ObjectHistogram(Isolate* isolate);
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~ObjectHistogram();
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// Called when a new class is registered in the isolate.
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void RegisterClass(const Class& cls);
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// Collect sample for the histogram. Called at back-edge of major GC.
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void Collect();
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// Print the histogram on stdout.
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void Print();
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void PrintToJSONStream(JSONStream* stream);
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private:
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// Add obj to histogram
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void Add(RawObject* obj);
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// For each class an Element keeps track of the accounting.
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class Element : public ValueObject {
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public:
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void Add(int size) {
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count_++;
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size_ += size;
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}
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intptr_t class_id_;
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intptr_t count_;
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intptr_t size_;
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};
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// Compare function for sorting result.
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static int compare(const Element** a, const Element** b);
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// This function returns a malloced array. Caller is responsible for calling
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// free().
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Element** GetSortedArray(intptr_t* array_length);
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intptr_t major_gc_count_;
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intptr_t table_length_;
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Element* table_;
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Isolate* isolate_;
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friend class ObjectHistogramVisitor;
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DISALLOW_COPY_AND_ASSIGN(ObjectHistogram);
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};
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} // namespace dart
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#endif // VM_HEAP_HISTOGRAM_H_
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