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270 lines
9.0 KiB
C++
270 lines
9.0 KiB
C++
//===-- AttributeImpl.h - Attribute Internals -------------------*- 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 various helper methods and classes used by
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/// LLVMContextImpl for creating and managing attributes.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_IR_ATTRIBUTEIMPL_H
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#define LLVM_LIB_IR_ATTRIBUTEIMPL_H
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#include "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/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 <cassert>
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#include <climits>
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#include <cstddef>
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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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class LLVMContext;
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//===----------------------------------------------------------------------===//
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/// \class
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/// \brief This class represents a single, uniqued attribute. That attribute
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/// could be a single enum, a tuple, or a string.
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class AttributeImpl : public FoldingSetNode {
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unsigned char KindID; ///< Holds the AttrEntryKind of the attribute
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protected:
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enum AttrEntryKind {
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EnumAttrEntry,
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IntAttrEntry,
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StringAttrEntry
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};
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AttributeImpl(AttrEntryKind KindID) : KindID(KindID) {}
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public:
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// AttributesImpl is uniqued, these should not be available.
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AttributeImpl(const AttributeImpl &) = delete;
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AttributeImpl &operator=(const AttributeImpl &) = delete;
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virtual ~AttributeImpl();
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bool isEnumAttribute() const { return KindID == EnumAttrEntry; }
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bool isIntAttribute() const { return KindID == IntAttrEntry; }
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bool isStringAttribute() const { return KindID == StringAttrEntry; }
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bool hasAttribute(Attribute::AttrKind A) const;
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bool hasAttribute(StringRef Kind) const;
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Attribute::AttrKind getKindAsEnum() const;
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uint64_t getValueAsInt() const;
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StringRef getKindAsString() const;
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StringRef getValueAsString() const;
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/// \brief Used when sorting the attributes.
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bool operator<(const AttributeImpl &AI) const;
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void Profile(FoldingSetNodeID &ID) const {
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if (isEnumAttribute())
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Profile(ID, getKindAsEnum(), 0);
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else if (isIntAttribute())
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Profile(ID, getKindAsEnum(), getValueAsInt());
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else
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Profile(ID, getKindAsString(), getValueAsString());
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}
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static void Profile(FoldingSetNodeID &ID, Attribute::AttrKind Kind,
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uint64_t Val) {
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ID.AddInteger(Kind);
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if (Val) ID.AddInteger(Val);
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}
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static void Profile(FoldingSetNodeID &ID, StringRef Kind, StringRef Values) {
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ID.AddString(Kind);
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if (!Values.empty()) ID.AddString(Values);
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}
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};
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//===----------------------------------------------------------------------===//
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/// \class
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/// \brief A set of classes that contain the value of the
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/// attribute object. There are three main categories: enum attribute entries,
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/// represented by Attribute::AttrKind; alignment attribute entries; and string
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/// attribute enties, which are for target-dependent attributes.
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class EnumAttributeImpl : public AttributeImpl {
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virtual void anchor();
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Attribute::AttrKind Kind;
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protected:
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EnumAttributeImpl(AttrEntryKind ID, Attribute::AttrKind Kind)
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: AttributeImpl(ID), Kind(Kind) {}
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public:
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EnumAttributeImpl(Attribute::AttrKind Kind)
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: AttributeImpl(EnumAttrEntry), Kind(Kind) {}
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Attribute::AttrKind getEnumKind() const { return Kind; }
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};
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class IntAttributeImpl : public EnumAttributeImpl {
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void anchor() override;
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uint64_t Val;
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public:
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IntAttributeImpl(Attribute::AttrKind Kind, uint64_t Val)
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: EnumAttributeImpl(IntAttrEntry, Kind), Val(Val) {
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assert((Kind == Attribute::Alignment || Kind == Attribute::StackAlignment ||
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Kind == Attribute::Dereferenceable ||
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Kind == Attribute::DereferenceableOrNull ||
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Kind == Attribute::AllocSize) &&
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"Wrong kind for int attribute!");
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}
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uint64_t getValue() const { return Val; }
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};
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class StringAttributeImpl : public AttributeImpl {
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virtual void anchor();
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std::string Kind;
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std::string Val;
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public:
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StringAttributeImpl(StringRef Kind, StringRef Val = StringRef())
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: AttributeImpl(StringAttrEntry), Kind(Kind), Val(Val) {}
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StringRef getStringKind() const { return Kind; }
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StringRef getStringValue() const { return Val; }
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};
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typedef std::pair<unsigned, AttributeSetNode *> IndexAttrPair;
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//===----------------------------------------------------------------------===//
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/// \class
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/// \brief This class represents a set of attributes that apply to the function,
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/// return type, and parameters.
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class AttributeSetImpl final
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: public FoldingSetNode,
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private TrailingObjects<AttributeSetImpl, IndexAttrPair> {
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friend class AttributeSet;
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friend TrailingObjects;
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private:
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LLVMContext &Context;
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unsigned NumSlots; ///< Number of entries in this set.
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/// Bitset with a bit for each available attribute Attribute::AttrKind.
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uint64_t AvailableFunctionAttrs;
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// Helper fn for TrailingObjects class.
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size_t numTrailingObjects(OverloadToken<IndexAttrPair>) { return NumSlots; }
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/// \brief Return a pointer to the IndexAttrPair for the specified slot.
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const IndexAttrPair *getNode(unsigned Slot) const {
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return getTrailingObjects<IndexAttrPair>() + Slot;
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}
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public:
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AttributeSetImpl(LLVMContext &C,
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ArrayRef<std::pair<unsigned, AttributeSetNode *>> Slots)
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: Context(C), NumSlots(Slots.size()), AvailableFunctionAttrs(0) {
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static_assert(Attribute::EndAttrKinds <=
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sizeof(AvailableFunctionAttrs) * CHAR_BIT,
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"Too many attributes");
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#ifndef NDEBUG
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if (Slots.size() >= 2) {
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for (const std::pair<unsigned, AttributeSetNode *> *i = Slots.begin() + 1,
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*e = Slots.end();
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i != e; ++i) {
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assert((i-1)->first <= i->first && "Attribute set not ordered!");
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}
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}
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#endif
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// There's memory after the node where we can store the entries in.
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std::copy(Slots.begin(), Slots.end(), getTrailingObjects<IndexAttrPair>());
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// Initialize AvailableFunctionAttrs summary bitset.
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if (NumSlots > 0) {
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static_assert(AttributeSet::FunctionIndex == ~0u,
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"FunctionIndex should be biggest possible index");
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const std::pair<unsigned, AttributeSetNode *> &Last = Slots.back();
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if (Last.first == AttributeSet::FunctionIndex) {
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const AttributeSetNode *Node = Last.second;
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for (Attribute I : *Node) {
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if (!I.isStringAttribute())
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AvailableFunctionAttrs |= ((uint64_t)1) << I.getKindAsEnum();
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}
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}
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}
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}
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// AttributesSetImpt is uniqued, these should not be available.
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AttributeSetImpl(const AttributeSetImpl &) = delete;
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AttributeSetImpl &operator=(const AttributeSetImpl &) = delete;
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void operator delete(void *p) { ::operator delete(p); }
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/// \brief Get the context that created this AttributeSetImpl.
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LLVMContext &getContext() { return Context; }
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/// \brief Return the number of slots used in this attribute list. This is
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/// the number of arguments that have an attribute set on them (including the
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/// function itself).
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unsigned getNumSlots() const { return NumSlots; }
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/// \brief Get the index of the given "slot" in the AttrNodes list. This index
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/// is the index of the return, parameter, or function object that the
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/// attributes are applied to, not the index into the AttrNodes list where the
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/// attributes reside.
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unsigned getSlotIndex(unsigned Slot) const {
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return getNode(Slot)->first;
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}
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/// \brief Retrieve the attributes for the given "slot" in the AttrNode list.
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/// \p Slot is an index into the AttrNodes list, not the index of the return /
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/// parameter/ function which the attributes apply to.
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AttributeSet getSlotAttributes(unsigned Slot) const {
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return AttributeSet::get(Context, *getNode(Slot));
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}
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/// \brief Retrieve the attribute set node for the given "slot" in the
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/// AttrNode list.
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AttributeSetNode *getSlotNode(unsigned Slot) const {
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return getNode(Slot)->second;
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}
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/// \brief Return true if the AttributeSetNode for the FunctionIndex has an
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/// enum attribute of the given kind.
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bool hasFnAttribute(Attribute::AttrKind Kind) const {
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return AvailableFunctionAttrs & ((uint64_t)1) << Kind;
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}
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typedef AttributeSetNode::iterator iterator;
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iterator begin(unsigned Slot) const { return getSlotNode(Slot)->begin(); }
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iterator end(unsigned Slot) const { return getSlotNode(Slot)->end(); }
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void Profile(FoldingSetNodeID &ID) const {
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Profile(ID, makeArrayRef(getNode(0), getNumSlots()));
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}
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static void Profile(FoldingSetNodeID &ID,
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ArrayRef<std::pair<unsigned, AttributeSetNode*>> Nodes) {
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for (const auto &Node : Nodes) {
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ID.AddInteger(Node.first);
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ID.AddPointer(Node.second);
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}
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}
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void dump() const;
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};
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} // end namespace llvm
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#endif // LLVM_LIB_IR_ATTRIBUTEIMPL_H
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