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/* -*- 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 ProcessedStack_h__
#define ProcessedStack_h__
#include <vector>
#include "ipc/IPCMessageUtils.h"
#include "ipc/IPCMessageUtilsSpecializations.h"
#include "mozilla/ipc/MessageChannel.h"
#include "mozilla/Vector.h"
#include "nsStringFwd.h"
#include "shared-libraries.h"
namespace mozilla {
namespace Telemetry {
// This class represents a stack trace and the modules referenced in that trace.
// It is designed to be easy to read and write to disk or network and doesn't
// include any logic on how to collect or read the information it stores.
class ProcessedStack {
public:
ProcessedStack();
size_t GetStackSize() const;
size_t GetNumModules() const;
struct Frame {
// The offset of this program counter in its module or an absolute pc.
uintptr_t mOffset;
// The index to pass to GetModule to get the module this program counter
// was in.
uint16_t mModIndex;
};
struct Module {
// The file name, /foo/bar/libxul.so for example.
// It can contain unicode characters.
nsString mName;
nsCString mBreakpadId;
bool operator==(const Module& other) const;
};
const Frame& GetFrame(unsigned aIndex) const;
void AddFrame(const Frame& aFrame);
const Module& GetModule(unsigned aIndex) const;
void AddModule(const Module& aFrame);
void Clear();
private:
std::vector<Module> mModules;
std::vector<Frame> mStack;
};
// Get the current list of loaded modules, filter and pair it to the provided
// stack. We let the caller collect the stack since different callers have
// different needs (current thread X main thread, stopping the thread, etc).
ProcessedStack GetStackAndModules(const std::vector<uintptr_t>& aPCs);
// This class optimizes repeated calls to GetStackAndModules.
class BatchProcessedStackGenerator {
public:
BatchProcessedStackGenerator();
ProcessedStack GetStackAndModules(const std::vector<uintptr_t>& aPCs);
template <typename AllocatorPolicy>
ProcessedStack GetStackAndModules(
const Vector<void*, 0, AllocatorPolicy>& aPCs) {
return GetStackAndModules(reinterpret_cast<const uintptr_t*>(aPCs.begin()),
reinterpret_cast<const uintptr_t*>(aPCs.end()));
}
private:
ProcessedStack GetStackAndModules(const uintptr_t* aBegin,
const uintptr_t* aEnd);
#if defined(MOZ_GECKO_PROFILER)
SharedLibraryInfo mSortedRawModules;
#endif
};
} // namespace Telemetry
} // namespace mozilla
namespace IPC {
template <>
struct ParamTraits<mozilla::Telemetry::ProcessedStack::Module> {
typedef mozilla::Telemetry::ProcessedStack::Module paramType;
static void Write(MessageWriter* aWriter, const paramType& aParam) {
WriteParam(aWriter, aParam.mName);
WriteParam(aWriter, aParam.mBreakpadId);
}
static bool Read(MessageReader* aReader, paramType* aResult) {
if (!ReadParam(aReader, &aResult->mName)) {
return false;
}
if (!ReadParam(aReader, &aResult->mBreakpadId)) {
return false;
}
return true;
}
};
template <>
struct ParamTraits<mozilla::Telemetry::ProcessedStack::Frame> {
typedef mozilla::Telemetry::ProcessedStack::Frame paramType;
static void Write(MessageWriter* aWriter, const paramType& aParam) {
WriteParam(aWriter, aParam.mOffset);
WriteParam(aWriter, aParam.mModIndex);
}
static bool Read(MessageReader* aReader, paramType* aResult) {
if (!ReadParam(aReader, &aResult->mOffset)) {
return false;
}
if (!ReadParam(aReader, &aResult->mModIndex)) {
return false;
}
return true;
}
};
} // namespace IPC
#endif // ProcessedStack_h__
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