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/* -*- Mode: C++; tab-width: 8; 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 CombinedStacks_h_
#define CombinedStacks_h_
#include <vector>
#include "ipc/IPCMessageUtils.h"
#include "ProcessedStack.h"
class JSObject;
struct JSContext;
namespace mozilla {
namespace Telemetry {
/**
* This class is conceptually a list of ProcessedStack objects, but it
* represents them more efficiently by keeping a single global list of modules.
*/
class CombinedStacks {
public:
explicit CombinedStacks();
explicit CombinedStacks(size_t aMaxStacksCount);
CombinedStacks(CombinedStacks&&) = default;
CombinedStacks& operator=(CombinedStacks&&) = default;
void Swap(CombinedStacks& aOther);
typedef std::vector<Telemetry::ProcessedStack::Frame> Stack;
const Telemetry::ProcessedStack::Module& GetModule(unsigned aIndex) const;
size_t GetModuleCount() const;
const Stack& GetStack(unsigned aIndex) const;
size_t AddStack(const Telemetry::ProcessedStack& aStack);
void AddStacks(const CombinedStacks& aStacks);
size_t GetStackCount() const;
size_t SizeOfExcludingThis() const;
void RemoveStack(unsigned aIndex);
size_t GetMaxStacksCount() const;
/** Clears the contents of vectors and resets the index. */
void Clear();
private:
std::vector<Telemetry::ProcessedStack::Module> mModules;
// A circular buffer to hold the stacks.
std::vector<Stack> mStacks;
// The index of the next buffer element to write to in mStacks.
size_t mNextIndex;
// The maximum number of stacks to keep in the CombinedStacks object.
size_t mMaxStacksCount;
void AddFrame(
size_t aStackIndex, const ProcessedStack::Frame& aFrame,
const std::function<const ProcessedStack::Module&(int)>& aModuleGetter);
friend struct ::IPC::ParamTraits<CombinedStacks>;
};
/**
* Creates a JSON representation of given combined stacks object.
*/
JSObject* CreateJSStackObject(JSContext* cx, const CombinedStacks& stacks);
} // namespace Telemetry
} // namespace mozilla
namespace IPC {
template <>
struct ParamTraits<mozilla::Telemetry::CombinedStacks> {
typedef mozilla::Telemetry::CombinedStacks paramType;
static void Write(MessageWriter* aWriter, const paramType& aParam) {
WriteParam(aWriter, aParam.mModules);
WriteParam(aWriter, aParam.mStacks);
WriteParam(aWriter, aParam.mNextIndex);
WriteParam(aWriter, aParam.mMaxStacksCount);
}
static bool Read(MessageReader* aReader, paramType* aResult) {
if (!ReadParam(aReader, &aResult->mModules)) {
return false;
}
if (!ReadParam(aReader, &aResult->mStacks)) {
return false;
}
if (!ReadParam(aReader, &aResult->mNextIndex)) {
return false;
}
if (!ReadParam(aReader, &aResult->mMaxStacksCount)) {
return false;
}
for (const auto& stack : aResult->mStacks) {
for (const auto& frame : stack) {
if (frame.mModIndex != std::numeric_limits<uint16_t>::max() &&
frame.mModIndex >= aResult->mModules.size()) {
return false;
}
}
}
return true;
}
};
} // namespace IPC
#endif // CombinedStacks_h_
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