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Add a DenseMapInfo class for the AttributeSet.

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We are going to place the AttributeSet into a DenseMap during assembly writing.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174812 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2013-02-09 15:42:51 +00:00
parent 00d9da1ac4
commit 16274258d1
1 changed files with 35 additions and 13 deletions
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48
include/llvm/IR/Attributes.h
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@ -183,6 +183,26 @@ public:
}
};
//===----------------------------------------------------------------------===//
/// \class
/// \brief Provide DenseMapInfo for Attribute::AttrKinds. This is used by
/// AttrBuilder.
template<> struct DenseMapInfo<Attribute::AttrKind> {
static inline Attribute::AttrKind getEmptyKey() {
return Attribute::AttrKindEmptyKey;
}
static inline Attribute::AttrKind getTombstoneKey() {
return Attribute::AttrKindTombstoneKey;
}
static unsigned getHashValue(const Attribute::AttrKind &Val) {
return Val * 37U;
}
static bool isEqual(const Attribute::AttrKind &LHS,
const Attribute::AttrKind &RHS) {
return LHS == RHS;
}
};
//===----------------------------------------------------------------------===//
/// \class
/// \brief This class holds the attributes for a function, its return value, and
@ -200,6 +220,7 @@ public:
private:
friend class AttrBuilder;
friend class AttributeSetImpl;
template <typename Ty> friend struct DenseMapInfo;
/// \brief The attributes that we are managing. This can be null to represent
/// the empty attributes list.
@ -339,22 +360,23 @@ public:
//===----------------------------------------------------------------------===//
/// \class
/// \brief Provide DenseMapInfo for Attribute::AttrKinds. This is used by
/// AttrBuilder.
template<> struct DenseMapInfo<Attribute::AttrKind> {
static inline Attribute::AttrKind getEmptyKey() {
return Attribute::AttrKindEmptyKey;
/// \brief Provide DenseMapInfo for AttributeSet.
template<> struct DenseMapInfo<AttributeSet> {
static inline AttributeSet getEmptyKey() {
uintptr_t Val = static_cast<uintptr_t>(-1);
Val <<= PointerLikeTypeTraits<void*>::NumLowBitsAvailable;
return AttributeSet(reinterpret_cast<AttributeSetImpl*>(Val));
}
static inline Attribute::AttrKind getTombstoneKey() {
return Attribute::AttrKindTombstoneKey;
static inline AttributeSet getTombstoneKey() {
uintptr_t Val = static_cast<uintptr_t>(-2);
Val <<= PointerLikeTypeTraits<void*>::NumLowBitsAvailable;
return AttributeSet(reinterpret_cast<AttributeSetImpl*>(Val));
}
static unsigned getHashValue(const Attribute::AttrKind &Val) {
return Val * 37U;
}
static bool isEqual(const Attribute::AttrKind &LHS,
const Attribute::AttrKind &RHS) {
return LHS == RHS;
static unsigned getHashValue(AttributeSet AS) {
return (unsigned((uintptr_t)AS.pImpl) >> 4) ^
(unsigned((uintptr_t)AS.pImpl) >> 9);
}
static bool isEqual(AttributeSet LHS, AttributeSet RHS) { return LHS == RHS; }
};
//===----------------------------------------------------------------------===//