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authorbunnei <bunneidev@gmail.com>2018-11-16 23:42:59 +0100
committerGitHub <noreply@github.com>2018-11-16 23:42:59 +0100
commit3c7ba00d738bd4e5323f02ec5055a7e5833ce6f9 (patch)
tree2db0ac2df4cd388b512e7d98339c8f66afb4f2a8
parentMerge pull request #1638 from FreddyFunk/SetMemoryPermission-Stubbed (diff)
parentCommon/Bitfield: store value as unsigned type (diff)
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-rw-r--r--src/common/bit_field.h19
1 files changed, 10 insertions, 9 deletions
diff --git a/src/common/bit_field.h b/src/common/bit_field.h
index bf803da8d..21e07925d 100644
--- a/src/common/bit_field.h
+++ b/src/common/bit_field.h
@@ -117,21 +117,21 @@ private:
// We don't delete it because we want BitField to be trivially copyable.
constexpr BitField& operator=(const BitField&) = default;
- // StorageType is T for non-enum types and the underlying type of T if
+ // UnderlyingType is T for non-enum types and the underlying type of T if
// T is an enumeration. Note that T is wrapped within an enable_if in the
// former case to workaround compile errors which arise when using
// std::underlying_type<T>::type directly.
- using StorageType = typename std::conditional_t<std::is_enum<T>::value, std::underlying_type<T>,
- std::enable_if<true, T>>::type;
+ using UnderlyingType = typename std::conditional_t<std::is_enum_v<T>, std::underlying_type<T>,
+ std::enable_if<true, T>>::type;
- // Unsigned version of StorageType
- using StorageTypeU = std::make_unsigned_t<StorageType>;
+ // We store the value as the unsigned type to avoid undefined behaviour on value shifting
+ using StorageType = std::make_unsigned_t<UnderlyingType>;
public:
/// Constants to allow limited introspection of fields if needed
static constexpr std::size_t position = Position;
static constexpr std::size_t bits = Bits;
- static constexpr StorageType mask = (((StorageTypeU)~0) >> (8 * sizeof(T) - bits)) << position;
+ static constexpr StorageType mask = (((StorageType)~0) >> (8 * sizeof(T) - bits)) << position;
/**
* Formats a value by masking and shifting it according to the field parameters. A value
@@ -148,11 +148,12 @@ public:
* union in a constexpr context.
*/
static constexpr FORCE_INLINE T ExtractValue(const StorageType& storage) {
- if (std::numeric_limits<T>::is_signed) {
+ if constexpr (std::numeric_limits<UnderlyingType>::is_signed) {
std::size_t shift = 8 * sizeof(T) - bits;
- return (T)((storage << (shift - position)) >> shift);
+ return static_cast<T>(static_cast<UnderlyingType>(storage << (shift - position)) >>
+ shift);
} else {
- return (T)((storage & mask) >> position);
+ return static_cast<T>((storage & mask) >> position);
}
}