mirror of
https://github.com/mozilla/gecko-dev.git
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728 lines
18 KiB
C++
728 lines
18 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set sw=2 ts=8 et tw=80 : */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef __IPC_GLUE_IPCMESSAGEUTILS_H__
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#define __IPC_GLUE_IPCMESSAGEUTILS_H__
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#include "base/process_util.h"
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#include "chrome/common/ipc_message_utils.h"
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#include "mozilla/ArrayUtils.h"
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#include "mozilla/TimeStamp.h"
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#ifdef XP_WIN
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#include "mozilla/TimeStamp_windows.h"
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#endif
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#include "mozilla/TypedEnum.h"
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#include "mozilla/IntegerTypeTraits.h"
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#include <stdint.h>
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#include "nsID.h"
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#include "nsMemory.h"
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#include "nsString.h"
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#include "nsTArray.h"
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#include "js/StructuredClone.h"
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#include "nsCSSProperty.h"
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#ifdef _MSC_VER
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#pragma warning( disable : 4800 )
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#endif
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#if !defined(OS_POSIX)
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// This condition must be kept in sync with the one in
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// ipc_message_utils.h, but this dummy definition of
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// base::FileDescriptor acts as a static assert that we only get one
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// def or the other (or neither, in which case code using
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// FileDescriptor fails to build)
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namespace base { struct FileDescriptor { }; }
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#endif
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namespace mozilla {
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// This is a cross-platform approximation to HANDLE, which we expect
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// to be typedef'd to void* or thereabouts.
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typedef uintptr_t WindowsHandle;
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// XXX there are out of place and might be generally useful. Could
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// move to nscore.h or something.
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struct void_t {
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bool operator==(const void_t&) const { return true; }
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};
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struct null_t {
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bool operator==(const null_t&) const { return true; }
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};
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struct SerializedStructuredCloneBuffer
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{
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SerializedStructuredCloneBuffer()
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: data(nullptr), dataLength(0)
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{ }
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explicit SerializedStructuredCloneBuffer(const JSAutoStructuredCloneBuffer& aOther)
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{
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*this = aOther;
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}
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bool
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operator==(const SerializedStructuredCloneBuffer& aOther) const
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{
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return this->data == aOther.data &&
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this->dataLength == aOther.dataLength;
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}
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SerializedStructuredCloneBuffer&
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operator=(const JSAutoStructuredCloneBuffer& aOther)
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{
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data = aOther.data();
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dataLength = aOther.nbytes();
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return *this;
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}
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uint64_t* data;
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size_t dataLength;
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};
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} // namespace mozilla
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namespace IPC {
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/**
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* Generic enum serializer.
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*
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* Consider using the specializations below, such as ContiguousEnumSerializer.
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*
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* This is a generic serializer for any enum type used in IPDL.
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* Programmers can define ParamTraits<E> for enum type E by deriving
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* EnumSerializer<E, MyEnumValidator> where MyEnumValidator is a struct
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* that has to define a static IsLegalValue function returning whether
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* a given value is a legal value of the enum type at hand.
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*
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* \sa https://developer.mozilla.org/en/IPDL/Type_Serialization
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*/
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template <typename E, typename EnumValidator>
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struct EnumSerializer {
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typedef E paramType;
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typedef typename mozilla::UnsignedStdintTypeForSize<sizeof(paramType)>::Type
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uintParamType;
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static void Write(Message* aMsg, const paramType& aValue) {
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MOZ_ASSERT(EnumValidator::IsLegalValue(aValue));
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WriteParam(aMsg, uintParamType(aValue));
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}
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static bool Read(const Message* aMsg, void** aIter, paramType* aResult) {
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uintParamType value;
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if(!ReadParam(aMsg, aIter, &value) ||
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!EnumValidator::IsLegalValue(paramType(value))) {
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return false;
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}
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*aResult = paramType(value);
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return true;
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}
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};
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template <typename E,
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E MinLegal,
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E HighBound>
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struct ContiguousEnumValidator
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{
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static bool IsLegalValue(E e)
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{
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return MinLegal <= e && e < HighBound;
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}
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};
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template <typename E,
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MOZ_TEMPLATE_ENUM_CLASS_ENUM_TYPE(E) MinLegal,
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MOZ_TEMPLATE_ENUM_CLASS_ENUM_TYPE(E) HighBound>
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class ContiguousTypedEnumValidator
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{
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// Silence overzealous -Wtype-limits bug in GCC fixed in GCC 4.8:
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// "comparison of unsigned expression >= 0 is always true"
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// http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11856
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template <typename T>
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static bool IsLessThanOrEqual(T a, T b) { return a <= b; }
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public:
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static bool IsLegalValue(E e)
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{
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typedef MOZ_TEMPLATE_ENUM_CLASS_ENUM_TYPE(E) ActualEnumType;
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return IsLessThanOrEqual(MinLegal, ActualEnumType(e)) &&
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ActualEnumType(e) < HighBound;
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}
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};
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template <typename E,
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E AllBits>
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struct BitFlagsEnumValidator
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{
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static bool IsLegalValue(E e)
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{
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return (e & AllBits) == e;
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}
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};
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template <typename E,
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MOZ_TEMPLATE_ENUM_CLASS_ENUM_TYPE(E) AllBits>
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struct BitFlagsTypedEnumValidator
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{
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static bool IsLegalValue(E e)
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{
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return (e & AllBits) == e;
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}
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};
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/**
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* Specialization of EnumSerializer for enums with contiguous enum values.
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*
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* Provide two values: MinLegal, HighBound. An enum value x will be
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* considered legal if MinLegal <= x < HighBound.
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*
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* For example, following is definition of serializer for enum type FOO.
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* \code
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* enum FOO { FOO_FIRST, FOO_SECOND, FOO_LAST, NUM_FOO };
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*
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* template <>
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* struct ParamTraits<FOO>:
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* public ContiguousEnumSerializer<FOO, FOO_FIRST, NUM_FOO> {};
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* \endcode
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* FOO_FIRST, FOO_SECOND, and FOO_LAST are valid value.
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*/
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template <typename E,
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E MinLegal,
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E HighBound>
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struct ContiguousEnumSerializer
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: EnumSerializer<E,
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ContiguousEnumValidator<E, MinLegal, HighBound>>
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{};
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/**
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* Similar to ContiguousEnumSerializer, but for MFBT typed enums
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* as constructed by MOZ_BEGIN_ENUM_CLASS. This can go away when
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* we drop MOZ_BEGIN_ENUM_CLASS and use C++11 enum classes directly.
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*/
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template <typename E,
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MOZ_TEMPLATE_ENUM_CLASS_ENUM_TYPE(E) MinLegal,
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MOZ_TEMPLATE_ENUM_CLASS_ENUM_TYPE(E) HighBound>
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struct ContiguousTypedEnumSerializer
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: EnumSerializer<E,
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ContiguousTypedEnumValidator<E, MinLegal, HighBound>>
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{};
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/**
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* Specialization of EnumSerializer for enums representing bit flags.
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*
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* Provide one value: AllBits. An enum value x will be
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* considered legal if (x & AllBits) == x;
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*
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* Example:
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* \code
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* enum FOO {
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* FOO_FIRST = 1 << 0,
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* FOO_SECOND = 1 << 1,
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* FOO_LAST = 1 << 2,
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* ALL_BITS = (1 << 3) - 1
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* };
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*
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* template <>
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* struct ParamTraits<FOO>:
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* public BitFlagsEnumSerializer<FOO, FOO::ALL_BITS> {};
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* \endcode
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*/
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template <typename E,
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E AllBits>
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struct BitFlagsEnumSerializer
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: EnumSerializer<E,
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BitFlagsEnumValidator<E, AllBits>>
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{};
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/**
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* Similar to BitFlagsEnumSerializer, but for MFBT typed enums
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* as constructed by MOZ_BEGIN_ENUM_CLASS. This can go away when
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* we drop MOZ_BEGIN_ENUM_CLASS and use C++11 enum classes directly.
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*/
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template <typename E,
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MOZ_TEMPLATE_ENUM_CLASS_ENUM_TYPE(E) AllBits>
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struct BitFlagsTypedEnumSerializer
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: EnumSerializer<E,
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BitFlagsTypedEnumValidator<E, AllBits>>
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{};
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template <>
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struct ParamTraits<base::ChildPrivileges>
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: public ContiguousEnumSerializer<base::ChildPrivileges,
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base::PRIVILEGES_DEFAULT,
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base::PRIVILEGES_LAST>
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{ };
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template<>
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struct ParamTraits<int8_t>
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{
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typedef int8_t paramType;
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static void Write(Message* aMsg, const paramType& aParam)
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{
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aMsg->WriteBytes(&aParam, sizeof(aParam));
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}
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static bool Read(const Message* aMsg, void** aIter, paramType* aResult)
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{
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const char* outp;
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if (!aMsg->ReadBytes(aIter, &outp, sizeof(*aResult)))
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return false;
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*aResult = *reinterpret_cast<const paramType*>(outp);
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return true;
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}
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};
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template<>
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struct ParamTraits<uint8_t>
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{
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typedef uint8_t paramType;
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static void Write(Message* aMsg, const paramType& aParam)
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{
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aMsg->WriteBytes(&aParam, sizeof(aParam));
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}
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static bool Read(const Message* aMsg, void** aIter, paramType* aResult)
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{
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const char* outp;
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if (!aMsg->ReadBytes(aIter, &outp, sizeof(*aResult)))
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return false;
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*aResult = *reinterpret_cast<const paramType*>(outp);
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return true;
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}
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};
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#if !defined(OS_POSIX)
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// See above re: keeping definitions in sync
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template<>
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struct ParamTraits<base::FileDescriptor>
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{
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typedef base::FileDescriptor paramType;
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static void Write(Message* aMsg, const paramType& aParam) {
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NS_RUNTIMEABORT("FileDescriptor isn't meaningful on this platform");
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}
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static bool Read(const Message* aMsg, void** aIter, paramType* aResult) {
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NS_RUNTIMEABORT("FileDescriptor isn't meaningful on this platform");
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return false;
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}
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};
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#endif // !defined(OS_POSIX)
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template <>
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struct ParamTraits<nsACString>
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{
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typedef nsACString paramType;
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static void Write(Message* aMsg, const paramType& aParam)
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{
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bool isVoid = aParam.IsVoid();
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aMsg->WriteBool(isVoid);
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if (isVoid)
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// represents a nullptr pointer
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return;
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uint32_t length = aParam.Length();
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WriteParam(aMsg, length);
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aMsg->WriteBytes(aParam.BeginReading(), length);
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}
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static bool Read(const Message* aMsg, void** aIter, paramType* aResult)
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{
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bool isVoid;
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if (!aMsg->ReadBool(aIter, &isVoid))
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return false;
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if (isVoid) {
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aResult->SetIsVoid(true);
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return true;
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}
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uint32_t length;
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if (ReadParam(aMsg, aIter, &length)) {
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const char* buf;
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if (aMsg->ReadBytes(aIter, &buf, length)) {
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aResult->Assign(buf, length);
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return true;
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}
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}
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return false;
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}
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static void Log(const paramType& aParam, std::wstring* aLog)
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{
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if (aParam.IsVoid())
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aLog->append(L"(NULL)");
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else
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aLog->append(UTF8ToWide(aParam.BeginReading()));
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}
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};
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template <>
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struct ParamTraits<nsAString>
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{
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typedef nsAString paramType;
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static void Write(Message* aMsg, const paramType& aParam)
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{
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bool isVoid = aParam.IsVoid();
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aMsg->WriteBool(isVoid);
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if (isVoid)
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// represents a nullptr pointer
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return;
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uint32_t length = aParam.Length();
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WriteParam(aMsg, length);
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aMsg->WriteBytes(aParam.BeginReading(), length * sizeof(char16_t));
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}
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static bool Read(const Message* aMsg, void** aIter, paramType* aResult)
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{
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bool isVoid;
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if (!aMsg->ReadBool(aIter, &isVoid))
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return false;
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if (isVoid) {
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aResult->SetIsVoid(true);
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return true;
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}
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uint32_t length;
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if (ReadParam(aMsg, aIter, &length)) {
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const char16_t* buf;
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if (aMsg->ReadBytes(aIter, reinterpret_cast<const char**>(&buf),
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length * sizeof(char16_t))) {
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aResult->Assign(buf, length);
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return true;
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}
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}
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return false;
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}
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static void Log(const paramType& aParam, std::wstring* aLog)
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{
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if (aParam.IsVoid())
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aLog->append(L"(NULL)");
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else {
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#ifdef WCHAR_T_IS_UTF16
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aLog->append(reinterpret_cast<const wchar_t*>(aParam.BeginReading()));
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#else
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uint32_t length = aParam.Length();
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for (uint32_t index = 0; index < length; index++) {
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aLog->push_back(std::wstring::value_type(aParam[index]));
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}
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#endif
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}
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}
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};
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template <>
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struct ParamTraits<nsCString> : ParamTraits<nsACString>
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{
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typedef nsCString paramType;
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};
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template <>
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struct ParamTraits<nsLiteralCString> : ParamTraits<nsACString>
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{
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typedef nsLiteralCString paramType;
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};
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#ifdef MOZILLA_INTERNAL_API
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template<>
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struct ParamTraits<nsAutoCString> : ParamTraits<nsCString>
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{
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typedef nsAutoCString paramType;
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};
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#endif // MOZILLA_INTERNAL_API
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template <>
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struct ParamTraits<nsString> : ParamTraits<nsAString>
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{
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typedef nsString paramType;
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};
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template <>
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struct ParamTraits<nsLiteralString> : ParamTraits<nsAString>
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{
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typedef nsLiteralString paramType;
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};
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template <typename E>
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struct ParamTraits<FallibleTArray<E> >
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{
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typedef FallibleTArray<E> paramType;
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static void Write(Message* aMsg, const paramType& aParam)
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{
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uint32_t length = aParam.Length();
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WriteParam(aMsg, length);
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for (uint32_t index = 0; index < length; index++) {
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WriteParam(aMsg, aParam[index]);
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}
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}
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static bool Read(const Message* aMsg, void** aIter, paramType* aResult)
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{
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uint32_t length;
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if (!ReadParam(aMsg, aIter, &length)) {
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return false;
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}
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aResult->SetCapacity(length);
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for (uint32_t index = 0; index < length; index++) {
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E* element = aResult->AppendElement();
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if (!(element && ReadParam(aMsg, aIter, element))) {
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return false;
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}
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}
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return true;
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}
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static void Log(const paramType& aParam, std::wstring* aLog)
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{
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for (uint32_t index = 0; index < aParam.Length(); index++) {
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if (index) {
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aLog->append(L" ");
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}
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LogParam(aParam[index], aLog);
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}
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}
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};
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template<typename E>
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struct ParamTraits<InfallibleTArray<E> >
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{
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typedef InfallibleTArray<E> paramType;
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static void Write(Message* aMsg, const paramType& aParam)
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{
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WriteParam(aMsg, static_cast<const FallibleTArray<E>&>(aParam));
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}
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// deserialize the array fallibly, but return an InfallibleTArray
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static bool Read(const Message* aMsg, void** aIter, paramType* aResult)
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{
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FallibleTArray<E> temp;
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if (!ReadParam(aMsg, aIter, &temp))
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return false;
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aResult->SwapElements(temp);
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return true;
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}
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static void Log(const paramType& aParam, std::wstring* aLog)
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{
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LogParam(static_cast<const FallibleTArray<E>&>(aParam), aLog);
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}
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};
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template<>
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struct ParamTraits<float>
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{
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typedef float paramType;
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static void Write(Message* aMsg, const paramType& aParam)
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{
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aMsg->WriteBytes(&aParam, sizeof(paramType));
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}
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static bool Read(const Message* aMsg, void** aIter, paramType* aResult)
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{
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const char* outFloat;
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if (!aMsg->ReadBytes(aIter, &outFloat, sizeof(float)))
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return false;
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*aResult = *reinterpret_cast<const float*>(outFloat);
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return true;
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}
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static void Log(const paramType& aParam, std::wstring* aLog)
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{
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aLog->append(StringPrintf(L"%g", aParam));
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}
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};
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|
|
template <>
|
|
struct ParamTraits<nsCSSProperty>
|
|
: public ContiguousEnumSerializer<nsCSSProperty,
|
|
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, void** 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, void** 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, void** 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, void** 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, void** 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, void** 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::SerializedStructuredCloneBuffer>
|
|
{
|
|
typedef mozilla::SerializedStructuredCloneBuffer paramType;
|
|
|
|
static void Write(Message* aMsg, const paramType& aParam)
|
|
{
|
|
WriteParam(aMsg, aParam.dataLength);
|
|
if (aParam.dataLength) {
|
|
// Structured clone data must be 64-bit aligned.
|
|
aMsg->WriteBytes(aParam.data, aParam.dataLength, sizeof(uint64_t));
|
|
}
|
|
}
|
|
|
|
static bool Read(const Message* aMsg, void** aIter, paramType* aResult)
|
|
{
|
|
if (!ReadParam(aMsg, aIter, &aResult->dataLength)) {
|
|
return false;
|
|
}
|
|
|
|
if (aResult->dataLength) {
|
|
const char** buffer =
|
|
const_cast<const char**>(reinterpret_cast<char**>(&aResult->data));
|
|
// Structured clone data must be 64-bit aligned.
|
|
if (!aMsg->ReadBytes(aIter, buffer, aResult->dataLength,
|
|
sizeof(uint64_t))) {
|
|
return false;
|
|
}
|
|
} else {
|
|
aResult->data = nullptr;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static void Log(const paramType& aParam, std::wstring* aLog)
|
|
{
|
|
LogParam(aParam.dataLength, aLog);
|
|
}
|
|
};
|
|
|
|
} /* namespace IPC */
|
|
|
|
#endif /* __IPC_GLUE_IPCMESSAGEUTILS_H__ */
|