зеркало из https://github.com/mozilla/gecko-dev.git
76 строки
1.9 KiB
C++
76 строки
1.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#ifndef KeyedStackCapturer_h__
|
|
#define KeyedStackCapturer_h__
|
|
|
|
#include "Telemetry.h"
|
|
#include "nsString.h"
|
|
#include "nsClassHashtable.h"
|
|
#include "mozilla/Mutex.h"
|
|
#include "CombinedStacks.h"
|
|
|
|
struct JSContext;
|
|
|
|
namespace mozilla {
|
|
namespace Telemetry {
|
|
|
|
/**
|
|
* Allows taking a snapshot of a call stack on demand. Captured stacks are
|
|
* indexed by a string key in a hash table. The stack is only captured Once
|
|
* for each key. Consequent captures with the same key result in incrementing
|
|
* capture counter without re-capturing the stack.
|
|
*/
|
|
class KeyedStackCapturer
|
|
{
|
|
public:
|
|
KeyedStackCapturer()
|
|
: mStackCapturerMutex("Telemetry::StackCapturerMutex")
|
|
{}
|
|
|
|
/**
|
|
* Captures a stack for the given key.
|
|
*/
|
|
void Capture(const nsACString& aKey);
|
|
|
|
/**
|
|
* Transforms captured stacks into a JS object.
|
|
*/
|
|
NS_IMETHODIMP ReflectCapturedStacks(
|
|
JSContext *cx, JS::MutableHandle<JS::Value> ret);
|
|
|
|
/**
|
|
* Resets captured stacks and the information related to them.
|
|
*/
|
|
void Clear();
|
|
|
|
private:
|
|
/**
|
|
* Describes how often a stack was captured.
|
|
*/
|
|
struct StackFrequencyInfo {
|
|
// A number of times the stack was captured.
|
|
uint32_t mCount;
|
|
// Index of the stack inside stacks array.
|
|
uint32_t mIndex;
|
|
|
|
StackFrequencyInfo(uint32_t aCount, uint32_t aIndex)
|
|
: mCount(aCount)
|
|
, mIndex(aIndex)
|
|
{}
|
|
};
|
|
|
|
typedef nsClassHashtable<nsCStringHashKey, StackFrequencyInfo> FrequencyInfoMapType;
|
|
|
|
FrequencyInfoMapType mStackInfos;
|
|
CombinedStacks mStacks;
|
|
Mutex mStackCapturerMutex;
|
|
};
|
|
|
|
} // namespace Telemetry
|
|
} // namespace mozilla
|
|
|
|
#endif // KeyedStackCapturer_h__
|