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gecko/ipc/hal/DaemonSocketPDUHelpers.h
Thomas Zimmermann 8e8f1e692a Bug 1202386: Add logging macros for HAL IPC, r=shuang 
The code for packing and unpacking IPC messages does currently not
output detailed error message. This patch adds macros that display
information about the failed operation and arguments. The overhead
of the macros is small and the fast path can be inlined.
2015-09-10 11:32:26 +02:00

1034 lines
22 KiB
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 mozilla_ipc_DaemonSocketPDUHelpers_h
#define mozilla_ipc_DaemonSocketPDUHelpers_h
#include <stdint.h>
#include "mozilla/ipc/DaemonSocketPDU.h"
#include "nsString.h"
namespace mozilla {
namespace ipc {
struct DaemonSocketPDUHeader {
DaemonSocketPDUHeader()
: mService(0x00)
, mOpcode(0x00)
, mLength(0x00)
{ }
DaemonSocketPDUHeader(uint8_t aService, uint8_t aOpcode, uint16_t aLength)
: mService(aService)
, mOpcode(aOpcode)
, mLength(aLength)
{ }
uint8_t mService;
uint8_t mOpcode;
uint16_t mLength;
};
namespace DaemonSocketPDUHelpers {
//
// Logging
//
// The HAL IPC logging macros below print clear error messages for
// failed IPC operations. Use |MOZ_HAL_IPC_CONVERT_WARN_IF|,
// |MOZ_HAL_IPC_PACK_WARN_IF| and |MOZ_HAL_IPC_UNPACK_WARN_IF| to
// test for failures when processing PDUs.
//
// All macros accept the test condition as their first argument, and
// additional type information: the convert macro takes the input and
// output types, the pack macro takes the input type, and the unpack
// macro takes output type. All macros return the result of the test
// condition. If the test fails (i.e., the condition is true), they
// output a warning to the log.
//
// Don't call the functions in the detail namespace. They are helpers
// and not for general use.
//
namespace detail {
void
LogProtocolError(const char*, ...);
inline bool
ConvertWarnIfImpl(const char* aFile, unsigned long aLine,
bool aCondition, const char* aExpr, const char* aIn,
const char* aOut)
{
if (MOZ_UNLIKELY(aCondition)) {
LogProtocolError("%s:%d: Convert('%s' to '%s') failed: %s",
aFile, aLine, aIn, aOut, aExpr);
}
return aCondition;
}
inline bool
PackWarnIfImpl(const char* aFile, unsigned long aLine,
bool aCondition, const char* aExpr, const char* aIn)
{
if (MOZ_UNLIKELY(aCondition)) {
LogProtocolError("%s:%d: Pack('%s') failed: %s",
aFile, aLine, aIn, aExpr);
}
return aCondition;
}
inline bool
UnpackWarnIfImpl(const char* aFile, unsigned long aLine,
bool aCondition, const char* aExpr, const char* aOut)
{
if (MOZ_UNLIKELY(aCondition)) {
LogProtocolError("%s:%d: Unpack('%s') failed: %s",
aFile, aLine, aOut, aExpr);
}
return aCondition;
}
} // namespace detail
#define MOZ_HAL_IPC_CONVERT_WARN_IF(condition, in, out) \
::mozilla::ipc::DaemonSocketPDUHelpers::detail:: \
ConvertWarnIfImpl(__FILE__, __LINE__, condition, #condition, #in, #out)
#define MOZ_HAL_IPC_PACK_WARN_IF(condition, in) \
::mozilla::ipc::DaemonSocketPDUHelpers::detail:: \
PackWarnIfImpl(__FILE__, __LINE__, condition, #condition, #in)
#define MOZ_HAL_IPC_UNPACK_WARN_IF(condition, out) \
::mozilla::ipc::DaemonSocketPDUHelpers::detail:: \
UnpackWarnIfImpl(__FILE__, __LINE__, condition, #condition, #out)
//
// Conversion
//
// PDUs can only store primitive data types, such as integers or
// byte arrays. Gecko often uses more complex data types, such as
// enumators or stuctures. Conversion functions convert between
// primitive data and internal Gecko's data types during a PDU's
// packing and unpacking.
//
nsresult
Convert(bool aIn, uint8_t& aOut);
nsresult
Convert(bool aIn, int32_t& aOut);
nsresult
Convert(int aIn, uint8_t& aOut);
nsresult
Convert(int aIn, int16_t& aOut);
nsresult
Convert(int aIn, int32_t& aOut);
nsresult
Convert(uint8_t aIn, bool& aOut);
nsresult
Convert(uint8_t aIn, char& aOut);
nsresult
Convert(uint8_t aIn, int& aOut);
nsresult
Convert(uint8_t aIn, unsigned long& aOut);
nsresult
Convert(uint32_t aIn, int& aOut);
nsresult
Convert(uint32_t aIn, uint8_t& aOut);
nsresult
Convert(size_t aIn, uint16_t& aOut);
//
// Packing
//
// introduce link errors on non-handled data types
template <typename T>
nsresult
PackPDU(T aIn, DaemonSocketPDU& aPDU);
nsresult
PackPDU(bool aIn, DaemonSocketPDU& aPDU);
inline nsresult
PackPDU(uint8_t aIn, DaemonSocketPDU& aPDU)
{
return aPDU.Write(aIn);
}
inline nsresult
PackPDU(uint16_t aIn, DaemonSocketPDU& aPDU)
{
return aPDU.Write(aIn);
}
inline nsresult
PackPDU(int32_t aIn, DaemonSocketPDU& aPDU)
{
return aPDU.Write(aIn);
}
inline nsresult
PackPDU(uint32_t aIn, DaemonSocketPDU& aPDU)
{
return aPDU.Write(aIn);
}
nsresult
PackPDU(const DaemonSocketPDUHeader& aIn, DaemonSocketPDU& aPDU);
/* |PackConversion| is a helper for packing converted values. Pass
* an instance of this structure to |PackPDU| to convert a value from
* the input type to the output type and and write it to the PDU.
*/
template<typename Tin, typename Tout>
struct PackConversion {
PackConversion(const Tin& aIn)
: mIn(aIn)
{ }
const Tin& mIn;
};
template<typename Tin, typename Tout>
inline nsresult
PackPDU(const PackConversion<Tin, Tout>& aIn, DaemonSocketPDU& aPDU)
{
Tout out;
nsresult rv = Convert(aIn.mIn, out);
if (NS_FAILED(rv)) {
return rv;
}
return PackPDU(out, aPDU);
}
/* |PackArray| is a helper for packing arrays. Pass an instance
* of this structure as the first argument to |PackPDU| to pack
* an array. The array's maximum default length is 255 elements.
*/
template <typename T>
struct PackArray
{
PackArray(const T* aData, size_t aLength)
: mData(aData)
, mLength(aLength)
{ }
const T* mData;
size_t mLength;
};
/* This implementation of |PackPDU| packs the length of an array
* and the elements of the array one-by-one.
*/
template<typename T>
inline nsresult
PackPDU(const PackArray<T>& aIn, DaemonSocketPDU& aPDU)
{
for (size_t i = 0; i < aIn.mLength; ++i) {
nsresult rv = PackPDU(aIn.mData[i], aPDU);
if (NS_FAILED(rv)) {
return rv;
}
}
return NS_OK;
}
template<>
inline nsresult
PackPDU<uint8_t>(const PackArray<uint8_t>& aIn, DaemonSocketPDU& aPDU)
{
/* Write raw bytes in one pass */
return aPDU.Write(aIn.mData, aIn.mLength);
}
template<>
inline nsresult
PackPDU<char>(const PackArray<char>& aIn, DaemonSocketPDU& aPDU)
{
/* Write raw bytes in one pass */
return aPDU.Write(aIn.mData, aIn.mLength);
}
/* |PackCString0| is a helper for packing 0-terminated C string,
* including the \0 character. Pass an instance of this structure
* as the first argument to |PackPDU| to pack a string.
*/
struct PackCString0
{
PackCString0(const nsCString& aString)
: mString(aString)
{ }
const nsCString& mString;
};
/* This implementation of |PackPDU| packs a 0-terminated C string.
*/
inline nsresult
PackPDU(const PackCString0& aIn, DaemonSocketPDU& aPDU)
{
return PackPDU(
PackArray<uint8_t>(reinterpret_cast<const uint8_t*>(aIn.mString.get()),
aIn.mString.Length() + 1), aPDU);
}
/* |PackReversed| is a helper for packing data in reversed order. Pass an
* instance of this structure as the first argument to |PackPDU| to pack data
* in reversed order.
*/
template<typename T>
struct PackReversed
{
PackReversed(const T& aValue)
: mValue(aValue)
{ }
const T& mValue;
};
/* No general rules to pack data in reversed order. Signal a link error if the
* type |T| of |PackReversed| is not defined explicitly.
*/
template<typename T>
nsresult
PackPDU(const PackReversed<T>& aIn, DaemonSocketPDU& aPDU);
/* This implementation of |PackPDU| packs elements in |PackArray| in reversed
* order. (ex. reversed GATT UUID, see bug 1171866)
*/
template<typename U>
inline nsresult
PackPDU(const PackReversed<PackArray<U>>& aIn, DaemonSocketPDU& aPDU)
{
for (size_t i = 0; i < aIn.mValue.mLength; ++i) {
nsresult rv = PackPDU(aIn.mValue.mData[aIn.mValue.mLength - i - 1], aPDU);
if (NS_FAILED(rv)) {
return rv;
}
}
return NS_OK;
}
template <typename T1, typename T2>
inline nsresult
PackPDU(const T1& aIn1, const T2& aIn2, DaemonSocketPDU& aPDU)
{
nsresult rv = PackPDU(aIn1, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
return PackPDU(aIn2, aPDU);
}
template <typename T1, typename T2, typename T3>
inline nsresult
PackPDU(const T1& aIn1, const T2& aIn2, const T3& aIn3,
DaemonSocketPDU& aPDU)
{
nsresult rv = PackPDU(aIn1, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn2, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
return PackPDU(aIn3, aPDU);
}
template <typename T1, typename T2, typename T3, typename T4>
inline nsresult
PackPDU(const T1& aIn1, const T2& aIn2, const T3& aIn3, const T4& aIn4,
DaemonSocketPDU& aPDU)
{
nsresult rv = PackPDU(aIn1, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn2, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn3, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
return PackPDU(aIn4, aPDU);
}
template <typename T1, typename T2, typename T3,
typename T4, typename T5>
inline nsresult
PackPDU(const T1& aIn1, const T2& aIn2, const T3& aIn3,
const T4& aIn4, const T5& aIn5,
DaemonSocketPDU& aPDU)
{
nsresult rv = PackPDU(aIn1, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn2, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn3, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn4, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
return PackPDU(aIn5, aPDU);
}
template <typename T1, typename T2, typename T3,
typename T4, typename T5, typename T6>
inline nsresult
PackPDU(const T1& aIn1, const T2& aIn2, const T3& aIn3,
const T4& aIn4, const T5& aIn5, const T6& aIn6,
DaemonSocketPDU& aPDU)
{
nsresult rv = PackPDU(aIn1, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn2, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn3, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn4, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn5, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
return PackPDU(aIn6, aPDU);
}
template <typename T1, typename T2, typename T3,
typename T4, typename T5, typename T6,
typename T7>
inline nsresult
PackPDU(const T1& aIn1, const T2& aIn2, const T3& aIn3,
const T4& aIn4, const T5& aIn5, const T6& aIn6,
const T7& aIn7, DaemonSocketPDU& aPDU)
{
nsresult rv = PackPDU(aIn1, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn2, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn3, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn4, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn5, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn6, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
return PackPDU(aIn7, aPDU);
}
template <typename T1, typename T2, typename T3,
typename T4, typename T5, typename T6,
typename T7, typename T8>
inline nsresult
PackPDU(const T1& aIn1, const T2& aIn2, const T3& aIn3,
const T4& aIn4, const T5& aIn5, const T6& aIn6,
const T7& aIn7, const T8& aIn8, DaemonSocketPDU& aPDU)
{
nsresult rv = PackPDU(aIn1, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn2, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn3, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn4, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn5, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn6, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn7, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
return PackPDU(aIn8, aPDU);
}
template <typename T1, typename T2, typename T3,
typename T4, typename T5, typename T6,
typename T7, typename T8, typename T9,
typename T10, typename T11, typename T12,
typename T13>
inline nsresult
PackPDU(const T1& aIn1, const T2& aIn2, const T3& aIn3,
const T4& aIn4, const T5& aIn5, const T6& aIn6,
const T7& aIn7, const T8& aIn8, const T9& aIn9,
const T10& aIn10, const T11& aIn11, const T12& aIn12,
const T13& aIn13, DaemonSocketPDU& aPDU)
{
nsresult rv = PackPDU(aIn1, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn2, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn3, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn4, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn5, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn6, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn7, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn8, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn9, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn10, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn11, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
rv = PackPDU(aIn12, aPDU);
if (NS_FAILED(rv)) {
return rv;
}
return PackPDU(aIn13, aPDU);
}
//
// Unpacking
//
// introduce link errors on non-handled data types
template <typename T>
nsresult
UnpackPDU(DaemonSocketPDU& aPDU, T& aOut);
nsresult
UnpackPDU(DaemonSocketPDU& aPDU, bool& aOut);
nsresult
UnpackPDU(DaemonSocketPDU& aPDU, char& aOut);
inline nsresult
UnpackPDU(DaemonSocketPDU& aPDU, int8_t& aOut)
{
return aPDU.Read(aOut);
}
inline nsresult
UnpackPDU(DaemonSocketPDU& aPDU, uint8_t& aOut)
{
return aPDU.Read(aOut);
}
inline nsresult
UnpackPDU(DaemonSocketPDU& aPDU, uint16_t& aOut)
{
return aPDU.Read(aOut);
}
inline nsresult
UnpackPDU(DaemonSocketPDU& aPDU, int32_t& aOut)
{
return aPDU.Read(aOut);
}
inline nsresult
UnpackPDU(DaemonSocketPDU& aPDU, uint32_t& aOut)
{
return aPDU.Read(aOut);
}
inline nsresult
UnpackPDU(DaemonSocketPDU& aPDU, DaemonSocketPDUHeader& aOut)
{
nsresult rv = UnpackPDU(aPDU, aOut.mService);
if (NS_FAILED(rv)) {
return rv;
}
rv = UnpackPDU(aPDU, aOut.mOpcode);
if (NS_FAILED(rv)) {
return rv;
}
return UnpackPDU(aPDU, aOut.mLength);
}
nsresult
UnpackPDU(DaemonSocketPDU& aPDU, nsDependentCString& aOut);
/* |UnpackCString0| is a helper for unpacking 0-terminated C string,
* including the \0 character. Pass an instance of this structure
* as the first argument to |UnpackPDU| to unpack a string.
*/
struct UnpackCString0
{
UnpackCString0(nsCString& aString)
: mString(&aString)
{ }
nsCString* mString; // non-null by construction
};
/* This implementation of |UnpackPDU| unpacks a 0-terminated C string.
*/
nsresult
UnpackPDU(DaemonSocketPDU& aPDU, const UnpackCString0& aOut);
/* |UnpackString0| is a helper for unpacking 0-terminated C string,
* including the \0 character. Pass an instance of this structure
* as the first argument to |UnpackPDU| to unpack a C string and convert
* it to wide-character encoding.
*/
struct UnpackString0
{
UnpackString0(nsString& aString)
: mString(&aString)
{ }
nsString* mString; // non-null by construction
};
/* This implementation of |UnpackPDU| unpacks a 0-terminated C string
* and converts it to wide-character encoding.
*/
nsresult
UnpackPDU(DaemonSocketPDU& aPDU, const UnpackString0& aOut);
/* |UnpackConversion| is a helper for convering unpacked values. Pass
* an instance of this structure to |UnpackPDU| to read a value from
* the PDU in the input type and convert it to the output type.
*/
template<typename Tin, typename Tout>
struct UnpackConversion {
UnpackConversion(Tout& aOut)
: mOut(aOut)
{ }
Tout& mOut;
};
template<typename Tin, typename Tout>
inline nsresult
UnpackPDU(DaemonSocketPDU& aPDU, const UnpackConversion<Tin, Tout>& aOut)
{
Tin in;
nsresult rv = UnpackPDU(aPDU, in);
if (NS_FAILED(rv)) {
return rv;
}
return Convert(in, aOut.mOut);
}
/* |UnpackArray| is a helper for unpacking arrays. Pass an instance
* of this structure as the second argument to |UnpackPDU| to unpack
* an array.
*/
template <typename T>
struct UnpackArray
{
UnpackArray(T* aData, size_t aLength)
: mData(aData)
, mLength(aLength)
{ }
UnpackArray(nsAutoArrayPtr<T>& aData, size_t aLength)
: mData(nullptr)
, mLength(aLength)
{
aData = new T[mLength];
mData = aData.get();
}
UnpackArray(nsAutoArrayPtr<T>& aData, size_t aSize, size_t aElemSize)
: mData(nullptr)
, mLength(aSize / aElemSize)
{
aData = new T[mLength];
mData = aData.get();
}
T* mData;
size_t mLength;
};
template<typename T>
inline nsresult
UnpackPDU(DaemonSocketPDU& aPDU, const UnpackArray<T>& aOut)
{
for (size_t i = 0; i < aOut.mLength; ++i) {
nsresult rv = UnpackPDU(aPDU, aOut.mData[i]);
if (NS_FAILED(rv)) {
return rv;
}
}
return NS_OK;
}
template<typename T>
inline nsresult
UnpackPDU(DaemonSocketPDU& aPDU, UnpackArray<T>& aOut)
{
for (size_t i = 0; i < aOut.mLength; ++i) {
nsresult rv = UnpackPDU(aPDU, aOut.mData[i]);
if (NS_FAILED(rv)) {
return rv;
}
}
return NS_OK;
}
template<>
inline nsresult
UnpackPDU<uint8_t>(DaemonSocketPDU& aPDU, const UnpackArray<uint8_t>& aOut)
{
/* Read raw bytes in one pass */
return aPDU.Read(aOut.mData, aOut.mLength);
}
template<typename T>
inline nsresult
UnpackPDU(DaemonSocketPDU& aPDU, nsTArray<T>& aOut)
{
for (typename nsTArray<T>::size_type i = 0; i < aOut.Length(); ++i) {
nsresult rv = UnpackPDU(aPDU, aOut[i]);
if (NS_FAILED(rv)) {
return rv;
}
}
return NS_OK;
}
/* |UnpackReversed| is a helper for unpacking data in reversed order. Pass an
* instance of this structure as the second argument to |UnpackPDU| to unpack
* data in reversed order.
*/
template<typename T>
struct UnpackReversed
{
UnpackReversed(T& aValue)
: mValue(&aValue)
{ }
UnpackReversed(T&& aValue)
: mValue(&aValue)
{ }
T* mValue;
};
/* No general rules to unpack data in reversed order. Signal a link error if
* the type |T| of |UnpackReversed| is not defined explicitly.
*/
template<typename T>
nsresult
UnpackPDU(DaemonSocketPDU& aPDU, const UnpackReversed<T>& aOut);
template<typename U>
inline nsresult
UnpackPDU(DaemonSocketPDU& aPDU, const UnpackReversed<UnpackArray<U>>& aOut)
{
for (size_t i = 0; i < aOut.mValue->mLength; ++i) {
nsresult rv = UnpackPDU(aPDU,
aOut.mValue->mData[aOut.mValue->mLength - i - 1]);
if (NS_FAILED(rv)) {
return rv;
}
}
return NS_OK;
}
//
// Init operators
//
//
// Below are general-purpose init operators for Bluetooth. The classes
// of type |ConstantInitOp[1..3]| initialize results or notifications
// with constant values.
//
template <typename T1>
class ConstantInitOp1 final
{
public:
ConstantInitOp1(const T1& aArg1)
: mArg1(aArg1)
{ }
nsresult operator () (T1& aArg1) const
{
aArg1 = mArg1;
return NS_OK;
}
private:
const T1& mArg1;
};
template <typename T1, typename T2>
class ConstantInitOp2 final
{
public:
ConstantInitOp2(const T1& aArg1, const T2& aArg2)
: mArg1(aArg1)
, mArg2(aArg2)
{ }
nsresult operator () (T1& aArg1, T2& aArg2) const
{
aArg1 = mArg1;
aArg2 = mArg2;
return NS_OK;
}
private:
const T1& mArg1;
const T2& mArg2;
};
template <typename T1, typename T2, typename T3>
class ConstantInitOp3 final
{
public:
ConstantInitOp3(const T1& aArg1, const T2& aArg2, const T3& aArg3)
: mArg1(aArg1)
, mArg2(aArg2)
, mArg3(aArg3)
{ }
nsresult operator () (T1& aArg1, T2& aArg2, T3& aArg3) const
{
aArg1 = mArg1;
aArg2 = mArg2;
aArg3 = mArg3;
return NS_OK;
}
private:
const T1& mArg1;
const T2& mArg2;
const T3& mArg3;
};
// |PDUInitOP| provides functionality for init operators that unpack PDUs.
class PDUInitOp
{
protected:
PDUInitOp(DaemonSocketPDU& aPDU)
: mPDU(&aPDU)
{ }
DaemonSocketPDU& GetPDU() const
{
return *mPDU; // cannot be nullptr
}
void WarnAboutTrailingData() const;
private:
DaemonSocketPDU* mPDU; // Hold pointer to allow for constant instances
};
// |UnpackPDUInitOp| is a general-purpose init operator for all variants
// of |DaemonResultRunnable| and |DaemonNotificationRunnable|. The call
// operators of |UnpackPDUInitOp| unpack a PDU into the supplied
// arguments.
class UnpackPDUInitOp final : private PDUInitOp
{
public:
UnpackPDUInitOp(DaemonSocketPDU& aPDU)
: PDUInitOp(aPDU)
{ }
nsresult operator () () const
{
WarnAboutTrailingData();
return NS_OK;
}
template<typename T1>
nsresult operator () (T1& aArg1) const
{
nsresult rv = UnpackPDU(GetPDU(), aArg1);
if (NS_FAILED(rv)) {
return rv;
}
WarnAboutTrailingData();
return NS_OK;
}
template<typename T1, typename T2>
nsresult operator () (T1& aArg1, T2& aArg2) const
{
DaemonSocketPDU& pdu = GetPDU();
nsresult rv = UnpackPDU(pdu, aArg1);
if (NS_FAILED(rv)) {
return rv;
}
rv = UnpackPDU(pdu, aArg2);
if (NS_FAILED(rv)) {
return rv;
}
WarnAboutTrailingData();
return NS_OK;
}
template<typename T1, typename T2, typename T3>
nsresult operator () (T1& aArg1, T2& aArg2, T3& aArg3) const
{
DaemonSocketPDU& pdu = GetPDU();
nsresult rv = UnpackPDU(pdu, aArg1);
if (NS_FAILED(rv)) {
return rv;
}
rv = UnpackPDU(pdu, aArg2);
if (NS_FAILED(rv)) {
return rv;
}
rv = UnpackPDU(pdu, aArg3);
if (NS_FAILED(rv)) {
return rv;
}
WarnAboutTrailingData();
return NS_OK;
}
template<typename T1, typename T2, typename T3, typename T4>
nsresult operator () (T1& aArg1, T2& aArg2, T3& aArg3, T4& aArg4) const
{
DaemonSocketPDU& pdu = GetPDU();
nsresult rv = UnpackPDU(pdu, aArg1);
if (NS_FAILED(rv)) {
return rv;
}
rv = UnpackPDU(pdu, aArg2);
if (NS_FAILED(rv)) {
return rv;
}
rv = UnpackPDU(pdu, aArg3);
if (NS_FAILED(rv)) {
return rv;
}
rv = UnpackPDU(pdu, aArg4);
if (NS_FAILED(rv)) {
return rv;
}
WarnAboutTrailingData();
return NS_OK;
}
template<typename T1, typename T2, typename T3, typename T4, typename T5>
nsresult operator () (T1& aArg1, T2& aArg2, T3& aArg3, T4& aArg4,
T5& aArg5) const
{
DaemonSocketPDU& pdu = GetPDU();
nsresult rv = UnpackPDU(pdu, aArg1);
if (NS_FAILED(rv)) {
return rv;
}
rv = UnpackPDU(pdu, aArg2);
if (NS_FAILED(rv)) {
return rv;
}
rv = UnpackPDU(pdu, aArg3);
if (NS_FAILED(rv)) {
return rv;
}
rv = UnpackPDU(pdu, aArg4);
if (NS_FAILED(rv)) {
return rv;
}
rv = UnpackPDU(pdu, aArg5);
if (NS_FAILED(rv)) {
return rv;
}
WarnAboutTrailingData();
return NS_OK;
}
};
} // namespace DaemonSocketPDUHelpers
} // namespace ipc
} // namespace mozilla
#endif // mozilla_ipc_DaemonSocketPDUHelpers_h
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