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Bug 958375 - 3/9 - Add a variant of EnumSerializer that works on MFBT typed enums - r=nfroyd

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This commit is contained in:
Benoit Jacob 2014-01-10 14:06:12 -05:00
parent a8ba12fe38
commit d0616b0136
1 changed files with 38 additions and 0 deletions
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38
ipc/glue/IPCMessageUtils.h
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@ -15,6 +15,7 @@
#ifdef XP_WIN
#include "mozilla/TimeStamp_windows.h"
#endif
#include "mozilla/TypedEnum.h"
#include <stdint.h>
@ -134,6 +135,43 @@ struct EnumSerializer {
}
};
/**
* Variant of EnumSerializer for MFBT's typed enums
* defined by MOZ_BEGIN_ENUM_CLASS in mfbt/TypedEnum.h
*
* This is only needed on non-C++11 compilers such as B2G's GCC 4.4,
* where MOZ_BEGIN_ENUM_CLASS is implemented using a nested enum, T::Enum,
* in a wrapper class T. In this case, the "typed enum" type T cannot be
* used as an integer template parameter type. MOZ_TEMPLATE_ENUM_CLASS_ENUM_TYPE(T)
* is how we get at the integer enum type.
*/
template <typename E,
MOZ_TEMPLATE_ENUM_CLASS_ENUM_TYPE(E) smallestLegal,
MOZ_TEMPLATE_ENUM_CLASS_ENUM_TYPE(E) highBound>
struct TypedEnumSerializer {
typedef E paramType;
typedef MOZ_TEMPLATE_ENUM_CLASS_ENUM_TYPE(E) intParamType;
static bool IsLegalValue(const paramType &aValue) {
return smallestLegal <= intParamType(aValue) && intParamType(aValue) < highBound;
}
static void Write(Message* aMsg, const paramType& aValue) {
MOZ_ASSERT(IsLegalValue(aValue));
WriteParam(aMsg, int32_t(intParamType(aValue)));
}
static bool Read(const Message* aMsg, void** aIter, paramType* aResult) {
int32_t value;
if(!ReadParam(aMsg, aIter, &value) ||
!IsLegalValue(intParamType(value))) {
return false;
}
*aResult = intParamType(value);
return true;
}
};
template <>
struct ParamTraits<base::ChildPrivileges>
: public EnumSerializer<base::ChildPrivileges,