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Implementation

Mercurial (d38398e5144e)

VCS Links

BitFlagsEnumSerializer

BitFlagsEnumValidator

ContiguousEnumSerializer

ContiguousEnumValidator

EnumSerializer

ParamTraits

ParamTraits

ParamTraits

ParamTraits

ParamTraits

ParamTraits

ParamTraits

ParamTraits

ParamTraits

ParamTraits

ParamTraits

ParamTraits

ParamTraits

ParamTraits

ParamTraits

ParamTraits

ParamTraits

ParamTraits

ParamTraits

ParamTraits

ParamTraits

ParamTraits

ParamTraits

ParamTraits

ParamTraits

ParamTraits

ParamTraits

ParamTraits

ParamTraits

SerializedStructuredCloneBuffer

null_t

void_t

Macros

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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 __IPC_GLUE_IPCMESSAGEUTILS_H__
#define __IPC_GLUE_IPCMESSAGEUTILS_H__

#include "base/process_util.h"
#include "chrome/common/ipc_message_utils.h"

#include "mozilla/ArrayUtils.h"
#include "mozilla/Attributes.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/dom/ipc/StructuredCloneData.h"
#include "mozilla/Maybe.h"
#include "mozilla/net/WebSocketFrame.h"
#include "mozilla/TimeStamp.h"
#ifdef XP_WIN
#include "mozilla/TimeStamp_windows.h"
#endif
#include "mozilla/TypeTraits.h"
#include "mozilla/IntegerTypeTraits.h"

#include <stdint.h>

#ifdef MOZ_CRASHREPORTER
#include "nsExceptionHandler.h"
#endif
#include "nsID.h"
#include "nsIWidget.h"
#include "nsMemory.h"
#include "nsString.h"
#include "nsTArray.h"
#include "js/StructuredClone.h"
#include "nsCSSPropertyID.h"

#ifdef _MSC_VER
#pragma warning( disable : 4800 )
#endif

#if !defined(OS_POSIX)
// This condition must be kept in sync with the one in
// ipc_message_utils.h, but this dummy definition of
// base::FileDescriptor acts as a static assert that we only get one
// def or the other (or neither, in which case code using
// FileDescriptor fails to build)
namespace base { struct FileDescriptor { }; }
#endif

namespace mozilla {

// This is a cross-platform approximation to HANDLE, which we expect
// to be typedef'd to void* or thereabouts.
typedef uintptr_t WindowsHandle;

// XXX there are out of place and might be generally useful.  Could
// move to nscore.h or something.
struct void_t {
  bool operator==(const void_t&) const { return true; }
};
struct null_t {
  bool operator==(const null_t&) const { return true; }
};

struct SerializedStructuredCloneBuffer final
{
  SerializedStructuredCloneBuffer&
  operator=(const SerializedStructuredCloneBuffer& aOther)
  {
    data.Clear();
    auto iter = aOther.data.Iter();
    while (!iter.Done()) {
      data.WriteBytes(iter.Data(), iter.RemainingInSegment());
      iter.Advance(aOther.data, iter.RemainingInSegment());
    }
    return *this;
  }

  bool
  operator==(const SerializedStructuredCloneBuffer& aOther) const
  {
    // The copy assignment operator and the equality operator are
    // needed by the IPDL generated code. We relied on the copy
    // assignment operator at some places but we never use the
    // equality operator.
    return false;
  }

  JSStructuredCloneData data;
};

} // namespace mozilla

namespace IPC {

/**
 * Maximum size, in bytes, of a single IPC message.
 */
static const uint32_t MAX_MESSAGE_SIZE = 65536;

/**
 * Generic enum serializer.
 *
 * Consider using the specializations below, such as ContiguousEnumSerializer.
 *
 * This is a generic serializer for any enum type used in IPDL.
 * Programmers can define ParamTraits<E> for enum type E by deriving
 * EnumSerializer<E, MyEnumValidator> where MyEnumValidator is a struct
 * that has to define a static IsLegalValue function returning whether
 * a given value is a legal value of the enum type at hand.
 *
 * \sa https://developer.mozilla.org/en/IPDL/Type_Serialization
 */
template <typename E, typename EnumValidator>
struct EnumSerializer {
  typedef E paramType;
  typedef typename mozilla::UnsignedStdintTypeForSize<sizeof(paramType)>::Type
          uintParamType;

  static void Write(Message* aMsg, const paramType& aValue) {
    MOZ_ASSERT(EnumValidator::IsLegalValue(aValue));
    WriteParam(aMsg, uintParamType(aValue));
  }

  static bool Read(const Message* aMsg, PickleIterator* aIter, paramType* aResult) {
    uintParamType value;
    if (!ReadParam(aMsg, aIter, &value)) {
#ifdef MOZ_CRASHREPORTER
      CrashReporter::AnnotateCrashReport(NS_LITERAL_CSTRING("IPCReadErrorReason"),
                                         NS_LITERAL_CSTRING("Bad iter"));
#endif
      return false;
    } else if (!EnumValidator::IsLegalValue(paramType(value))) {
#ifdef MOZ_CRASHREPORTER
      CrashReporter::AnnotateCrashReport(NS_LITERAL_CSTRING("IPCReadErrorReason"),
                                         NS_LITERAL_CSTRING("Illegal value"));
#endif
      return false;
    }
    *aResult = paramType(value);
    return true;
  }
};

template <typename E,
          E MinLegal,
          E HighBound>
class ContiguousEnumValidator
{
  // Silence overzealous -Wtype-limits bug in GCC fixed in GCC 4.8:
  // "comparison of unsigned expression >= 0 is always true"
  // http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11856
  template <typename T>
  static bool IsLessThanOrEqual(T a, T b) { return a <= b; }

public:
  static bool IsLegalValue(E e)
  {
    return IsLessThanOrEqual(MinLegal, e) && e < HighBound;
  }
};

template <typename E,
          E AllBits>
struct BitFlagsEnumValidator
{
  static bool IsLegalValue(E e)
  {
    return (e & AllBits) == e;
  }
};

/**
 * Specialization of EnumSerializer for enums with contiguous enum values.
 *
 * Provide two values: MinLegal, HighBound. An enum value x will be
 * considered legal if MinLegal <= x < HighBound.
 *
 * For example, following is definition of serializer for enum type FOO.
 * \code
 * enum FOO { FOO_FIRST, FOO_SECOND, FOO_LAST, NUM_FOO };
 *
 * template <>
 * struct ParamTraits<FOO>:
 *     public ContiguousEnumSerializer<FOO, FOO_FIRST, NUM_FOO> {};
 * \endcode
 * FOO_FIRST, FOO_SECOND, and FOO_LAST are valid value.
 */
template <typename E,
          E MinLegal,
          E HighBound>
struct ContiguousEnumSerializer
  : EnumSerializer<E,
                   ContiguousEnumValidator<E, MinLegal, HighBound>>
{};

/**
 * Specialization of EnumSerializer for enums representing bit flags.
 *
 * Provide one value: AllBits. An enum value x will be
 * considered legal if (x & AllBits) == x;
 *
 * Example:
 * \code
 * enum FOO {
 *   FOO_FIRST =  1 << 0,
 *   FOO_SECOND = 1 << 1,
 *   FOO_LAST =   1 << 2,
 *   ALL_BITS =   (1 << 3) - 1
 * };
 *
 * template <>
 * struct ParamTraits<FOO>:
 *     public BitFlagsEnumSerializer<FOO, FOO::ALL_BITS> {};
 * \endcode
 */
template <typename E,
          E AllBits>
struct BitFlagsEnumSerializer
  : EnumSerializer<E,
                   BitFlagsEnumValidator<E, AllBits>>
{};

template <>
struct ParamTraits<base::ChildPrivileges>
  : public ContiguousEnumSerializer<base::ChildPrivileges,
                                    base::PRIVILEGES_DEFAULT,
                                    base::PRIVILEGES_LAST>
{ };

template<>
struct ParamTraits<int8_t>
{
  typedef int8_t paramType;

  static void Write(Message* aMsg, const paramType& aParam)
  {
    aMsg->WriteBytes(&aParam, sizeof(aParam));
  }

  static bool Read(const Message* aMsg, PickleIterator* aIter, paramType* aResult)
  {
    return aMsg->ReadBytesInto(aIter, aResult, sizeof(*aResult));
  }
};

template<>
struct ParamTraits<uint8_t>
{
  typedef uint8_t paramType;

  static void Write(Message* aMsg, const paramType& aParam)
  {
    aMsg->WriteBytes(&aParam, sizeof(aParam));
  }

  static bool Read(const Message* aMsg, PickleIterator* aIter, paramType* aResult)
  {
    return aMsg->ReadBytesInto(aIter, aResult, sizeof(*aResult));
  }
};

#if !defined(OS_POSIX)
// See above re: keeping definitions in sync
template<>
struct ParamTraits<base::FileDescriptor>
{
  typedef base::FileDescriptor paramType;
  static void Write(Message* aMsg, const paramType& aParam) {
    MOZ_CRASH("FileDescriptor isn't meaningful on this platform");
  }
  static bool Read(const Message* aMsg, PickleIterator* aIter, paramType* aResult) {
    MOZ_CRASH("FileDescriptor isn't meaningful on this platform");
    return false;
  }
};
#endif  // !defined(OS_POSIX)

template <>
struct ParamTraits<nsACString>
{
  typedef nsACString paramType;

  static void Write(Message* aMsg, const paramType& aParam)
  {
    bool isVoid = aParam.IsVoid();
    aMsg->WriteBool(isVoid);

    if (isVoid)
      // represents a nullptr pointer
      return;

    uint32_t length = aParam.Length();
    WriteParam(aMsg, length);
    aMsg->WriteBytes(aParam.BeginReading(), length);
  }

  static bool Read(const Message* aMsg, PickleIterator* aIter, paramType* aResult)
  {
    bool isVoid;
    if (!aMsg->ReadBool(aIter, &isVoid))
      return false;

    if (isVoid) {
      aResult->SetIsVoid(true);
      return true;
    }

    uint32_t length;
    if (!ReadParam(aMsg, aIter, &length)) {
      return false;
    }
    aResult->SetLength(length);

    return aMsg->ReadBytesInto(aIter, aResult->BeginWriting(), length);
  }

  static void Log(const paramType& aParam, std::wstring* aLog)
  {
    if (aParam.IsVoid())
      aLog->append(L"(NULL)");
    else
      aLog->append(UTF8ToWide(aParam.BeginReading()));
  }
};

template <>
struct ParamTraits<nsAString>
{
  typedef nsAString paramType;

  static void Write(Message* aMsg, const paramType& aParam)
  {
    bool isVoid = aParam.IsVoid();
    aMsg->WriteBool(isVoid);

    if (isVoid)
      // represents a nullptr pointer
      return;

    uint32_t length = aParam.Length();
    WriteParam(aMsg, length);
    aMsg->WriteBytes(aParam.BeginReading(), length * sizeof(char16_t));
  }

  static bool Read(const Message* aMsg, PickleIterator* aIter, paramType* aResult)
  {
    bool isVoid;
    if (!aMsg->ReadBool(aIter, &isVoid))
      return false;

    if (isVoid) {
      aResult->SetIsVoid(true);
      return true;
    }

    uint32_t length;
    if (!ReadParam(aMsg, aIter, &length)) {
      return false;
    }
    aResult->SetLength(length);

    return aMsg->ReadBytesInto(aIter, aResult->BeginWriting(), length * sizeof(char16_t));
  }

  static void Log(const paramType& aParam, std::wstring* aLog)
  {
    if (aParam.IsVoid())
      aLog->append(L"(NULL)");
    else {
#ifdef WCHAR_T_IS_UTF16
      aLog->append(reinterpret_cast<const wchar_t*>(aParam.BeginReading()));
#else
      uint32_t length = aParam.Length();
      for (uint32_t index = 0; index < length; index++) {
        aLog->push_back(std::wstring::value_type(aParam[index]));
      }
#endif
    }
  }
};

template <>
struct ParamTraits<nsCString> : ParamTraits<nsACString>
{
  typedef nsCString paramType;
};

template <>
struct ParamTraits<nsLiteralCString> : ParamTraits<nsACString>
{
  typedef nsLiteralCString paramType;
};

#ifdef MOZILLA_INTERNAL_API

template<>
struct ParamTraits<nsAutoCString> : ParamTraits<nsCString>
{
  typedef nsAutoCString paramType;
};

#endif  // MOZILLA_INTERNAL_API

template <>
struct ParamTraits<nsString> : ParamTraits<nsAString>
{
  typedef nsString paramType;
};

template <>
struct ParamTraits<nsLiteralString> : ParamTraits<nsAString>
{
  typedef nsLiteralString paramType;
};

template <>
struct ParamTraits<nsDependentSubstring> : ParamTraits<nsAString>
{
  typedef nsDependentSubstring paramType;
};

template <>
struct ParamTraits<nsDependentCSubstring> : ParamTraits<nsACString>
{
  typedef nsDependentCSubstring paramType;
};

#ifdef MOZILLA_INTERNAL_API

template<>
struct ParamTraits<nsAutoString> : ParamTraits<nsString>
{
  typedef nsAutoString paramType;
};

#endif  // MOZILLA_INTERNAL_API

// Pickle::ReadBytes and ::WriteBytes take the length in ints, so we must
// ensure there is no overflow. This returns |false| if it would overflow.
// Otherwise, it returns |true| and places the byte length in |aByteLength|.
bool ByteLengthIsValid(uint32_t aNumElements, size_t aElementSize, int* aByteLength);

// Note: IPDL will sometimes codegen specialized implementations of
// nsTArray serialization and deserialization code in
// implementSpecialArrayPickling(). This is needed when ParamTraits<E>
// is not defined.
template <typename E>
struct ParamTraits<nsTArray<E>>
{
  typedef nsTArray<E> paramType;

  // We write arrays of integer or floating-point data using a single pickling
  // call, rather than writing each element individually.  We deliberately do
  // not use mozilla::IsPod here because it is perfectly reasonable to have
  // a data structure T for which IsPod<T>::value is true, yet also have a
  // ParamTraits<T> specialization.
  static const bool sUseWriteBytes = (mozilla::IsIntegral<E>::value ||
                                      mozilla::IsFloatingPoint<E>::value);

  static void Write(Message* aMsg, const paramType& aParam)
  {
    uint32_t length = aParam.Length();
    WriteParam(aMsg, length);

    if (sUseWriteBytes) {
      int pickledLength = 0;
      MOZ_RELEASE_ASSERT(ByteLengthIsValid(length, sizeof(E), &pickledLength));
      aMsg->WriteBytes(aParam.Elements(), pickledLength);
    } else {
      const E* elems = aParam.Elements();
      for (uint32_t index = 0; index < length; index++) {
        WriteParam(aMsg, elems[index]);
      }
    }
  }

  // This method uses infallible allocation so that an OOM failure will
  // show up as an OOM crash rather than an IPC FatalError.
  static bool Read(const Message* aMsg, PickleIterator* aIter, paramType* aResult)
  {
    uint32_t length;
    if (!ReadParam(aMsg, aIter, &length)) {
      return false;
    }

    if (sUseWriteBytes) {
      int pickledLength = 0;
      if (!ByteLengthIsValid(length, sizeof(E), &pickledLength)) {
        return false;
      }

      E* elements = aResult->AppendElements(length);
      return aMsg->ReadBytesInto(aIter, elements, pickledLength);
    } else {
      aResult->SetCapacity(length);

      for (uint32_t index = 0; index < length; index++) {
        E* element = aResult->AppendElement();
        if (!ReadParam(aMsg, aIter, element)) {
          return false;
        }
      }
      return true;
    }
  }

  static void Log(const paramType& aParam, std::wstring* aLog)
  {
    for (uint32_t index = 0; index < aParam.Length(); index++) {
      if (index) {
        aLog->append(L" ");
      }
      LogParam(aParam[index], aLog);
    }
  }
};

template<typename E>
struct ParamTraits<FallibleTArray<E>>
{
  typedef FallibleTArray<E> paramType;

  static void Write(Message* aMsg, const paramType& aParam)
  {
    WriteParam(aMsg, static_cast<const nsTArray<E>&>(aParam));
  }

  // Deserialize the array infallibly, but return a FallibleTArray.
  static bool Read(const Message* aMsg, PickleIterator* aIter, paramType* aResult)
  {
    nsTArray<E> temp;
    if (!ReadParam(aMsg, aIter, &temp))
      return false;

    aResult->SwapElements(temp);
    return true;
  }

  static void Log(const paramType& aParam, std::wstring* aLog)
  {
    LogParam(static_cast<const nsTArray<E>&>(aParam), aLog);
  }
};

template<typename E, size_t N>
struct ParamTraits<AutoTArray<E, N>> : ParamTraits<nsTArray<E>>
{
  typedef AutoTArray<E, N> paramType;
};

template<>
struct ParamTraits<float>
{
  typedef float paramType;

  static void Write(Message* aMsg, const paramType& aParam)
  {
    aMsg->WriteBytes(&aParam, sizeof(paramType));
  }

  static bool Read(const Message* aMsg, PickleIterator* aIter, paramType* aResult)
  {
    return aMsg->ReadBytesInto(aIter, aResult, sizeof(*aResult));
  }

  static void Log(const paramType& aParam, std::wstring* aLog)
  {
    aLog->append(StringPrintf(L"%g", aParam));
  }
};

template <>
struct ParamTraits<nsCSSPropertyID>
  : public ContiguousEnumSerializer<nsCSSPropertyID,
                                    eCSSProperty_UNKNOWN,
                                    eCSSProperty_COUNT>
{};

template<>
struct ParamTraits<mozilla::void_t>
{
  typedef mozilla::void_t paramType;
  static void Write(Message* aMsg, const paramType& aParam) { }
  static bool
  Read(const Message* aMsg, PickleIterator* aIter, paramType* aResult)
  {
    *aResult = paramType();
    return true;
  }
};

template<>
struct ParamTraits<mozilla::null_t>
{
  typedef mozilla::null_t paramType;
  static void Write(Message* aMsg, const paramType& aParam) { }
  static bool
  Read(const Message* aMsg, PickleIterator* aIter, paramType* aResult)
  {
    *aResult = paramType();
    return true;
  }
};

template<>
struct ParamTraits<nsID>
{
  typedef nsID paramType;

  static void Write(Message* aMsg, const paramType& aParam)
  {
    WriteParam(aMsg, aParam.m0);
    WriteParam(aMsg, aParam.m1);
    WriteParam(aMsg, aParam.m2);
    for (unsigned int i = 0; i < mozilla::ArrayLength(aParam.m3); i++) {
      WriteParam(aMsg, aParam.m3[i]);
    }
  }

  static bool Read(const Message* aMsg, PickleIterator* aIter, paramType* aResult)
  {
    if(!ReadParam(aMsg, aIter, &(aResult->m0)) ||
       !ReadParam(aMsg, aIter, &(aResult->m1)) ||
       !ReadParam(aMsg, aIter, &(aResult->m2)))
      return false;

    for (unsigned int i = 0; i < mozilla::ArrayLength(aResult->m3); i++)
      if (!ReadParam(aMsg, aIter, &(aResult->m3[i])))
        return false;

    return true;
  }

  static void Log(const paramType& aParam, std::wstring* aLog)
  {
    aLog->append(L"{");
    aLog->append(StringPrintf(L"%8.8X-%4.4X-%4.4X-",
                              aParam.m0,
                              aParam.m1,
                              aParam.m2));
    for (unsigned int i = 0; i < mozilla::ArrayLength(aParam.m3); i++)
      aLog->append(StringPrintf(L"%2.2X", aParam.m3[i]));
    aLog->append(L"}");
  }
};

template<>
struct ParamTraits<mozilla::TimeDuration>
{
  typedef mozilla::TimeDuration paramType;
  static void Write(Message* aMsg, const paramType& aParam)
  {
    WriteParam(aMsg, aParam.mValue);
  }
  static bool Read(const Message* aMsg, PickleIterator* aIter, paramType* aResult)
  {
    return ReadParam(aMsg, aIter, &aResult->mValue);
  };
};

template<>
struct ParamTraits<mozilla::TimeStamp>
{
  typedef mozilla::TimeStamp paramType;
  static void Write(Message* aMsg, const paramType& aParam)
  {
    WriteParam(aMsg, aParam.mValue);
  }
  static bool Read(const Message* aMsg, PickleIterator* aIter, paramType* aResult)
  {
    return ReadParam(aMsg, aIter, &aResult->mValue);
  };
};

#ifdef XP_WIN

template<>
struct ParamTraits<mozilla::TimeStampValue>
{
  typedef mozilla::TimeStampValue paramType;
  static void Write(Message* aMsg, const paramType& aParam)
  {
    WriteParam(aMsg, aParam.mGTC);
    WriteParam(aMsg, aParam.mQPC);
    WriteParam(aMsg, aParam.mHasQPC);
    WriteParam(aMsg, aParam.mIsNull);
  }
  static bool Read(const Message* aMsg, PickleIterator* aIter, paramType* aResult)
  {
    return (ReadParam(aMsg, aIter, &aResult->mGTC) &&
            ReadParam(aMsg, aIter, &aResult->mQPC) &&
            ReadParam(aMsg, aIter, &aResult->mHasQPC) &&
            ReadParam(aMsg, aIter, &aResult->mIsNull));
  }
};

#endif

template <>
struct ParamTraits<mozilla::dom::ipc::StructuredCloneData>
{
  typedef mozilla::dom::ipc::StructuredCloneData paramType;

  static void Write(Message* aMsg, const paramType& aParam)
  {
    aParam.WriteIPCParams(aMsg);
  }

  static bool Read(const Message* aMsg, PickleIterator* aIter, paramType* aResult)
  {
    return aResult->ReadIPCParams(aMsg, aIter);
  }

  static void Log(const paramType& aParam, std::wstring* aLog)
  {
    LogParam(aParam.DataLength(), aLog);
  }
};

template <>
struct ParamTraits<mozilla::net::WebSocketFrameData>
{
  typedef mozilla::net::WebSocketFrameData paramType;

  static void Write(Message* aMsg, const paramType& aParam)
  {
    aParam.WriteIPCParams(aMsg);
  }

  static bool Read(const Message* aMsg, PickleIterator* aIter, paramType* aResult)
  {
    return aResult->ReadIPCParams(aMsg, aIter);
  }
};

template <>
struct ParamTraits<JSStructuredCloneData>
{
  typedef JSStructuredCloneData paramType;

  static void Write(Message* aMsg, const paramType& aParam)
  {
    MOZ_ASSERT(!(aParam.Size() % sizeof(uint64_t)));
    WriteParam(aMsg, aParam.Size());
    auto iter =