107 lines
3.5 KiB
C++
107 lines
3.5 KiB
C++
//===-- AttributeSetNode.h - AttributeSet Internal Node ---------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// \brief This file defines the node class used internally by AttributeSet.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_IR_ATTRIBUTESETNODE_H
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#define LLVM_IR_ATTRIBUTESETNODE_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/FoldingSet.h"
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#include "llvm/ADT/Optional.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/IR/Attributes.h"
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#include "llvm/Support/TrailingObjects.h"
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#include <algorithm>
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#include <climits>
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#include <cstdint>
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#include <string>
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#include <utility>
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namespace llvm {
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//===----------------------------------------------------------------------===//
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/// \class
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/// \brief This class represents a group of attributes that apply to one
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/// element: function, return type, or parameter.
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class AttributeSetNode final
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: public FoldingSetNode,
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private TrailingObjects<AttributeSetNode, Attribute> {
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friend TrailingObjects;
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unsigned NumAttrs; ///< Number of attributes in this node.
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/// Bitset with a bit for each available attribute Attribute::AttrKind.
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uint64_t AvailableAttrs;
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AttributeSetNode(ArrayRef<Attribute> Attrs)
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: NumAttrs(Attrs.size()), AvailableAttrs(0) {
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static_assert(Attribute::EndAttrKinds <= sizeof(AvailableAttrs) * CHAR_BIT,
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"Too many attributes for AvailableAttrs");
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// There's memory after the node where we can store the entries in.
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std::copy(Attrs.begin(), Attrs.end(), getTrailingObjects<Attribute>());
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for (Attribute I : *this) {
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if (!I.isStringAttribute()) {
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AvailableAttrs |= ((uint64_t)1) << I.getKindAsEnum();
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}
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}
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}
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public:
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// AttributesSetNode is uniqued, these should not be available.
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AttributeSetNode(const AttributeSetNode &) = delete;
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AttributeSetNode &operator=(const AttributeSetNode &) = delete;
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void operator delete(void *p) { ::operator delete(p); }
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static AttributeSetNode *get(LLVMContext &C, ArrayRef<Attribute> Attrs);
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static AttributeSetNode *get(AttributeSet AS, unsigned Index) {
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return AS.getAttributes(Index);
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}
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/// \brief Return the number of attributes this AttributeSet contains.
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unsigned getNumAttributes() const { return NumAttrs; }
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bool hasAttribute(Attribute::AttrKind Kind) const {
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return AvailableAttrs & ((uint64_t)1) << Kind;
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}
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bool hasAttribute(StringRef Kind) const;
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bool hasAttributes() const { return NumAttrs != 0; }
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Attribute getAttribute(Attribute::AttrKind Kind) const;
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Attribute getAttribute(StringRef Kind) const;
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unsigned getAlignment() const;
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unsigned getStackAlignment() const;
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uint64_t getDereferenceableBytes() const;
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uint64_t getDereferenceableOrNullBytes() const;
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std::pair<unsigned, Optional<unsigned>> getAllocSizeArgs() const;
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std::string getAsString(bool InAttrGrp) const;
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typedef const Attribute *iterator;
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iterator begin() const { return getTrailingObjects<Attribute>(); }
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iterator end() const { return begin() + NumAttrs; }
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void Profile(FoldingSetNodeID &ID) const {
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Profile(ID, makeArrayRef(begin(), end()));
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}
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static void Profile(FoldingSetNodeID &ID, ArrayRef<Attribute> AttrList) {
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for (const auto &Attr : AttrList)
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Attr.Profile(ID);
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}
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};
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} // end namespace llvm
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#endif // LLVM_IR_ATTRIBUTESETNODE_H
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