+Attribute Attribute::get(LLVMContext &Context, ArrayRef<AttrVal> Vals) {
+ AttrBuilder B;
+ for (ArrayRef<AttrVal>::iterator I = Vals.begin(), E = Vals.end();
+ I != E; ++I)
+ B.addAttribute(*I);
+ return Attribute::get(Context, B);
+}
+
+Attribute Attribute::get(LLVMContext &Context, AttrBuilder &B) {
+ // If there are no attributes, return an empty Attribute class.
+ if (!B.hasAttributes())
+ return Attribute();
+
+ // Otherwise, build a key to look up the existing attributes.
+ LLVMContextImpl *pImpl = Context.pImpl;
+ FoldingSetNodeID ID;
+ ID.AddInteger(B.Raw());
+
+ void *InsertPoint;
+ AttributeImpl *PA = pImpl->AttrsSet.FindNodeOrInsertPos(ID, InsertPoint);
+
+ if (!PA) {
+ // If we didn't find any existing attributes of the same shape then create a
+ // new one and insert it.
+ PA = new AttributeImpl(B.Raw());
+ pImpl->AttrsSet.InsertNode(PA, InsertPoint);
+ }
+
+ // Return the AttributesList that we found or created.
+ return Attribute(PA);
+}
+
+bool Attribute::hasAttribute(AttrVal Val) const {
+ return Attrs && Attrs->hasAttribute(Val);
+}
+
+bool Attribute::hasAttributes() const {
+ return Attrs && Attrs->hasAttributes();
+}
+
+bool Attribute::hasAttributes(const Attribute &A) const {
+ return Attrs && Attrs->hasAttributes(A);
+}
+
+/// This returns the alignment field of an attribute as a byte alignment value.
+unsigned Attribute::getAlignment() const {
+ if (!hasAttribute(Attribute::Alignment))
+ return 0;
+ return 1U << ((Attrs->getAlignment() >> 16) - 1);
+}
+
+/// This returns the stack alignment field of an attribute as a byte alignment
+/// value.
+unsigned Attribute::getStackAlignment() const {
+ if (!hasAttribute(Attribute::StackAlignment))
+ return 0;
+ return 1U << ((Attrs->getStackAlignment() >> 26) - 1);
+}
+
+uint64_t Attribute::Raw() const {
+ return Attrs ? Attrs->Raw() : 0;
+}
+
+Attribute Attribute::typeIncompatible(Type *Ty) {
+ AttrBuilder Incompatible;
+
+ if (!Ty->isIntegerTy())
+ // Attribute that only apply to integers.
+ Incompatible.addAttribute(Attribute::SExt)
+ .addAttribute(Attribute::ZExt);
+
+ if (!Ty->isPointerTy())
+ // Attribute that only apply to pointers.
+ Incompatible.addAttribute(Attribute::ByVal)
+ .addAttribute(Attribute::Nest)
+ .addAttribute(Attribute::NoAlias)
+ .addAttribute(Attribute::NoCapture)
+ .addAttribute(Attribute::StructRet);
+
+ return Attribute::get(Ty->getContext(), Incompatible);
+}
+
+/// encodeLLVMAttributesForBitcode - This returns an integer containing an
+/// encoding of all the LLVM attributes found in the given attribute bitset.
+/// Any change to this encoding is a breaking change to bitcode compatibility.
+uint64_t Attribute::encodeLLVMAttributesForBitcode(Attribute Attrs) {
+ // FIXME: It doesn't make sense to store the alignment information as an
+ // expanded out value, we should store it as a log2 value. However, we can't
+ // just change that here without breaking bitcode compatibility. If this ever
+ // becomes a problem in practice, we should introduce new tag numbers in the
+ // bitcode file and have those tags use a more efficiently encoded alignment
+ // field.
+
+ // Store the alignment in the bitcode as a 16-bit raw value instead of a 5-bit
+ // log2 encoded value. Shift the bits above the alignment up by 11 bits.
+ uint64_t EncodedAttrs = Attrs.Raw() & 0xffff;
+ if (Attrs.hasAttribute(Attribute::Alignment))
+ EncodedAttrs |= Attrs.getAlignment() << 16;
+ EncodedAttrs |= (Attrs.Raw() & (0xffffULL << 21)) << 11;
+ return EncodedAttrs;
+}
+
+/// decodeLLVMAttributesForBitcode - This returns an attribute bitset containing
+/// the LLVM attributes that have been decoded from the given integer. This
+/// function must stay in sync with 'encodeLLVMAttributesForBitcode'.
+Attribute Attribute::decodeLLVMAttributesForBitcode(LLVMContext &C,
+ uint64_t EncodedAttrs) {
+ // The alignment is stored as a 16-bit raw value from bits 31--16. We shift
+ // the bits above 31 down by 11 bits.
+ unsigned Alignment = (EncodedAttrs & (0xffffULL << 16)) >> 16;
+ assert((!Alignment || isPowerOf2_32(Alignment)) &&
+ "Alignment must be a power of two.");
+
+ AttrBuilder B(EncodedAttrs & 0xffff);
+ if (Alignment)
+ B.addAlignmentAttr(Alignment);
+ B.addRawValue((EncodedAttrs & (0xffffULL << 32)) >> 11);
+ return Attribute::get(C, B);
+}
+
+std::string Attribute::getAsString() const {