1 files changed, 286 insertions, 0 deletions
diff --git a/llvm/lib/IR/AttributeImpl.h b/llvm/lib/IR/AttributeImpl.h
new file mode 100644
index 0000000000000..15e488bbb13b7
--- /dev/null
+++ b/llvm/lib/IR/AttributeImpl.h
@@ -0,0 +1,286 @@
+//===- AttributeImpl.h - Attribute Internals --------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file defines various helper methods and classes used by
+/// LLVMContextImpl for creating and managing attributes.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_IR_ATTRIBUTEIMPL_H
+#define LLVM_LIB_IR_ATTRIBUTEIMPL_H
+
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/FoldingSet.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/IR/Attributes.h"
+#include "llvm/Support/TrailingObjects.h"
+#include <cassert>
+#include <cstddef>
+#include <cstdint>
+#include <string>
+#include <utility>
+
+namespace llvm {
+
+class LLVMContext;
+class Type;
+
+//===----------------------------------------------------------------------===//
+/// \class
+/// This class represents a single, uniqued attribute. That attribute
+/// could be a single enum, a tuple, or a string.
+class AttributeImpl : public FoldingSetNode {
+  unsigned char KindID; ///< Holds the AttrEntryKind of the attribute
+
+protected:
+  enum AttrEntryKind {
+    EnumAttrEntry,
+    IntAttrEntry,
+    StringAttrEntry,
+    TypeAttrEntry,
+  };
+
+  AttributeImpl(AttrEntryKind KindID) : KindID(KindID) {}
+
+public:
+  // AttributesImpl is uniqued, these should not be available.
+  AttributeImpl(const AttributeImpl &) = delete;
+  AttributeImpl &operator=(const AttributeImpl &) = delete;
+
+  virtual ~AttributeImpl();
+
+  bool isEnumAttribute() const { return KindID == EnumAttrEntry; }
+  bool isIntAttribute() const { return KindID == IntAttrEntry; }
+  bool isStringAttribute() const { return KindID == StringAttrEntry; }
+  bool isTypeAttribute() const { return KindID == TypeAttrEntry; }
+
+  bool hasAttribute(Attribute::AttrKind A) const;
+  bool hasAttribute(StringRef Kind) const;
+
+  Attribute::AttrKind getKindAsEnum() const;
+  uint64_t getValueAsInt() const;
+
+  StringRef getKindAsString() const;
+  StringRef getValueAsString() const;
+
+  Type *getValueAsType() const;
+
+  /// Used when sorting the attributes.
+  bool operator<(const AttributeImpl &AI) const;
+
+  void Profile(FoldingSetNodeID &ID) const {
+    if (isEnumAttribute())
+      Profile(ID, getKindAsEnum(), static_cast<uint64_t>(0));
+    else if (isIntAttribute())
+      Profile(ID, getKindAsEnum(), getValueAsInt());
+    else if (isStringAttribute())
+      Profile(ID, getKindAsString(), getValueAsString());
+    else
+      Profile(ID, getKindAsEnum(), getValueAsType());
+  }
+
+  static void Profile(FoldingSetNodeID &ID, Attribute::AttrKind Kind,
+                      uint64_t Val) {
+    ID.AddInteger(Kind);
+    if (Val) ID.AddInteger(Val);
+  }
+
+  static void Profile(FoldingSetNodeID &ID, StringRef Kind, StringRef Values) {
+    ID.AddString(Kind);
+    if (!Values.empty()) ID.AddString(Values);
+  }
+
+  static void Profile(FoldingSetNodeID &ID, Attribute::AttrKind Kind,
+                      Type *Ty) {
+    ID.AddInteger(Kind);
+    ID.AddPointer(Ty);
+  }
+};
+
+//===----------------------------------------------------------------------===//
+/// \class
+/// A set of classes that contain the value of the
+/// attribute object. There are three main categories: enum attribute entries,
+/// represented by Attribute::AttrKind; alignment attribute entries; and string
+/// attribute enties, which are for target-dependent attributes.
+
+class EnumAttributeImpl : public AttributeImpl {
+  virtual void anchor();
+
+  Attribute::AttrKind Kind;
+
+protected:
+  EnumAttributeImpl(AttrEntryKind ID, Attribute::AttrKind Kind)
+      : AttributeImpl(ID), Kind(Kind) {}
+
+public:
+  EnumAttributeImpl(Attribute::AttrKind Kind)
+      : AttributeImpl(EnumAttrEntry), Kind(Kind) {}
+
+  Attribute::AttrKind getEnumKind() const { return Kind; }
+};
+
+class IntAttributeImpl : public EnumAttributeImpl {
+  uint64_t Val;
+
+  void anchor() override;
+
+public:
+  IntAttributeImpl(Attribute::AttrKind Kind, uint64_t Val)
+      : EnumAttributeImpl(IntAttrEntry, Kind), Val(Val) {
+    assert((Kind == Attribute::Alignment || Kind == Attribute::StackAlignment ||
+            Kind == Attribute::Dereferenceable ||
+            Kind == Attribute::DereferenceableOrNull ||
+            Kind == Attribute::AllocSize) &&
+           "Wrong kind for int attribute!");
+  }
+
+  uint64_t getValue() const { return Val; }
+};
+
+class StringAttributeImpl : public AttributeImpl {
+  virtual void anchor();
+
+  std::string Kind;
+  std::string Val;
+
+public:
+  StringAttributeImpl(StringRef Kind, StringRef Val = StringRef())
+      : AttributeImpl(StringAttrEntry), Kind(Kind), Val(Val) {}
+
+  StringRef getStringKind() const { return Kind; }
+  StringRef getStringValue() const { return Val; }
+};
+
+class TypeAttributeImpl : public EnumAttributeImpl {
+  void anchor() override;
+
+  Type *Ty;
+
+public:
+  TypeAttributeImpl(Attribute::AttrKind Kind, Type *Ty)
+      : EnumAttributeImpl(TypeAttrEntry, Kind), Ty(Ty) {}
+
+  Type *getTypeValue() const { return Ty; }
+};
+
+//===----------------------------------------------------------------------===//
+/// \class
+/// This class represents a group of attributes that apply to one
+/// element: function, return type, or parameter.
+class AttributeSetNode final
+    : public FoldingSetNode,
+      private TrailingObjects<AttributeSetNode, Attribute> {
+  friend TrailingObjects;
+
+  unsigned NumAttrs; ///< Number of attributes in this node.
+  /// Bitset with a bit for each available attribute Attribute::AttrKind.
+  uint8_t AvailableAttrs[12] = {};
+
+  AttributeSetNode(ArrayRef<Attribute> Attrs);
+
+public:
+  // AttributesSetNode is uniqued, these should not be available.
+  AttributeSetNode(const AttributeSetNode &) = delete;
+  AttributeSetNode &operator=(const AttributeSetNode &) = delete;
+
+  void operator delete(void *p) { ::operator delete(p); }
+
+  static AttributeSetNode *get(LLVMContext &C, const AttrBuilder &B);
+
+  static AttributeSetNode *get(LLVMContext &C, ArrayRef<Attribute> Attrs);
+
+  /// Return the number of attributes this AttributeList contains.
+  unsigned getNumAttributes() const { return NumAttrs; }
+
+  bool hasAttribute(Attribute::AttrKind Kind) const {
+    return AvailableAttrs[Kind / 8] & ((uint64_t)1) << (Kind % 8);
+  }
+  bool hasAttribute(StringRef Kind) const;
+  bool hasAttributes() const { return NumAttrs != 0; }
+
+  Attribute getAttribute(Attribute::AttrKind Kind) const;
+  Attribute getAttribute(StringRef Kind) const;
+
+  MaybeAlign getAlignment() const;
+  MaybeAlign getStackAlignment() const;
+  uint64_t getDereferenceableBytes() const;
+  uint64_t getDereferenceableOrNullBytes() const;
+  std::pair<unsigned, Optional<unsigned>> getAllocSizeArgs() const;
+  std::string getAsString(bool InAttrGrp) const;
+  Type *getByValType() const;
+
+  using iterator = const Attribute *;
+
+  iterator begin() const { return getTrailingObjects<Attribute>(); }
+  iterator end() const { return begin() + NumAttrs; }
+
+  void Profile(FoldingSetNodeID &ID) const {
+    Profile(ID, makeArrayRef(begin(), end()));
+  }
+
+  static void Profile(FoldingSetNodeID &ID, ArrayRef<Attribute> AttrList) {
+    for (const auto &Attr : AttrList)
+      Attr.Profile(ID);
+  }
+};
+
+using IndexAttrPair = std::pair<unsigned, AttributeSet>;
+
+//===----------------------------------------------------------------------===//
+/// \class
+/// This class represents a set of attributes that apply to the function,
+/// return type, and parameters.
+class AttributeListImpl final
+    : public FoldingSetNode,
+      private TrailingObjects<AttributeListImpl, AttributeSet> {
+  friend class AttributeList;
+  friend TrailingObjects;
+
+private:
+  LLVMContext &Context;
+  unsigned NumAttrSets; ///< Number of entries in this set.
+  /// Bitset with a bit for each available attribute Attribute::AttrKind.
+  uint8_t AvailableFunctionAttrs[12] = {};
+
+  // Helper fn for TrailingObjects class.
+  size_t numTrailingObjects(OverloadToken<AttributeSet>) { return NumAttrSets; }
+
+public:
+  AttributeListImpl(LLVMContext &C, ArrayRef<AttributeSet> Sets);
+
+  // AttributesSetImpt is uniqued, these should not be available.
+  AttributeListImpl(const AttributeListImpl &) = delete;
+  AttributeListImpl &operator=(const AttributeListImpl &) = delete;
+
+  void operator delete(void *p) { ::operator delete(p); }
+
+  /// Get the context that created this AttributeListImpl.
+  LLVMContext &getContext() { return Context; }
+
+  /// Return true if the AttributeSet or the FunctionIndex has an
+  /// enum attribute of the given kind.
+  bool hasFnAttribute(Attribute::AttrKind Kind) const {
+    return AvailableFunctionAttrs[Kind / 8] & ((uint64_t)1) << (Kind % 8);
+  }
+
+  using iterator = const AttributeSet *;
+
+  iterator begin() const { return getTrailingObjects<AttributeSet>(); }
+  iterator end() const { return begin() + NumAttrSets; }
+
+  void Profile(FoldingSetNodeID &ID) const;
+  static void Profile(FoldingSetNodeID &ID, ArrayRef<AttributeSet> Nodes);
+
+  void dump() const;
+};
+
+} // end namespace llvm
+
+#endif // LLVM_LIB_IR_ATTRIBUTEIMPL_H