llvm-mirror/lib/IR/AttributeImpl.h

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//===-- AttributeImpl.h - Attribute Internals -------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// \brief 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/FoldingSet.h"
#include "llvm/IR/Attributes.h"
#include <string>
namespace llvm {
class Constant;
class LLVMContext;
//===----------------------------------------------------------------------===//
/// \class
/// \brief 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
// AttributesImpl is uniqued, these should not be publicly available.
void operator=(const AttributeImpl &) LLVM_DELETED_FUNCTION;
AttributeImpl(const AttributeImpl &) LLVM_DELETED_FUNCTION;
protected:
enum AttrEntryKind {
EnumAttrEntry,
IntAttrEntry,
StringAttrEntry
};
AttributeImpl(AttrEntryKind KindID) : KindID(KindID) {}
public:
virtual ~AttributeImpl();
bool isEnumAttribute() const { return KindID == EnumAttrEntry; }
bool isIntAttribute() const { return KindID == IntAttrEntry; }
bool isStringAttribute() const { return KindID == StringAttrEntry; }
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;
/// \brief Used when sorting the attributes.
bool operator<(const AttributeImpl &AI) const;
void Profile(FoldingSetNodeID &ID) const {
if (isEnumAttribute())
Profile(ID, getKindAsEnum(), 0);
else if (isIntAttribute())
Profile(ID, getKindAsEnum(), getValueAsInt());
else
Profile(ID, getKindAsString(), getValueAsString());
}
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);
}
// FIXME: Remove this!
static uint64_t getAttrMask(Attribute::AttrKind Val);
};
//===----------------------------------------------------------------------===//
/// \class
/// \brief 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 {
void anchor() override;
uint64_t Val;
public:
IntAttributeImpl(Attribute::AttrKind Kind, uint64_t Val)
: EnumAttributeImpl(IntAttrEntry, Kind), Val(Val) {
assert(
(Kind == Attribute::Alignment || Kind == Attribute::StackAlignment ||
Kind == Attribute::Dereferenceable) &&
"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
/// \brief This class represents a group of attributes that apply to one
/// element: function, return type, or parameter.
class AttributeSetNode : public FoldingSetNode {
unsigned NumAttrs; ///< Number of attributes in this node.
AttributeSetNode(ArrayRef<Attribute> Attrs) : NumAttrs(Attrs.size()) {
// There's memory after the node where we can store the entries in.
std::copy(Attrs.begin(), Attrs.end(),
reinterpret_cast<Attribute *>(this + 1));
}
// AttributesSetNode is uniqued, these should not be publicly available.
void operator=(const AttributeSetNode &) LLVM_DELETED_FUNCTION;
AttributeSetNode(const AttributeSetNode &) LLVM_DELETED_FUNCTION;
public:
static AttributeSetNode *get(LLVMContext &C, ArrayRef<Attribute> Attrs);
bool hasAttribute(Attribute::AttrKind Kind) const;
bool hasAttribute(StringRef Kind) const;
bool hasAttributes() const { return NumAttrs != 0; }
Attribute getAttribute(Attribute::AttrKind Kind) const;
Attribute getAttribute(StringRef Kind) const;
unsigned getAlignment() const;
unsigned getStackAlignment() const;
uint64_t getDereferenceableBytes() const;
std::string getAsString(bool InAttrGrp) const;
typedef const Attribute *iterator;
iterator begin() const { return reinterpret_cast<iterator>(this + 1); }
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 (unsigned I = 0, E = AttrList.size(); I != E; ++I)
AttrList[I].Profile(ID);
}
};
//===----------------------------------------------------------------------===//
/// \class
/// \brief This class represents a set of attributes that apply to the function,
/// return type, and parameters.
class AttributeSetImpl : public FoldingSetNode {
friend class AttributeSet;
LLVMContext &Context;
typedef std::pair<unsigned, AttributeSetNode*> IndexAttrPair;
unsigned NumAttrs; ///< Number of entries in this set.
/// \brief Return a pointer to the IndexAttrPair for the specified slot.
const IndexAttrPair *getNode(unsigned Slot) const {
return reinterpret_cast<const IndexAttrPair *>(this + 1) + Slot;
}
// AttributesSet is uniqued, these should not be publicly available.
void operator=(const AttributeSetImpl &) LLVM_DELETED_FUNCTION;
AttributeSetImpl(const AttributeSetImpl &) LLVM_DELETED_FUNCTION;
public:
AttributeSetImpl(LLVMContext &C,
ArrayRef<std::pair<unsigned, AttributeSetNode *> > Attrs)
: Context(C), NumAttrs(Attrs.size()) {
#ifndef NDEBUG
if (Attrs.size() >= 2) {
for (const std::pair<unsigned, AttributeSetNode *> *i = Attrs.begin() + 1,
*e = Attrs.end();
i != e; ++i) {
assert((i-1)->first <= i->first && "Attribute set not ordered!");
}
}
#endif
// There's memory after the node where we can store the entries in.
std::copy(Attrs.begin(), Attrs.end(),
reinterpret_cast<IndexAttrPair *>(this + 1));
}
/// \brief Get the context that created this AttributeSetImpl.
LLVMContext &getContext() { return Context; }
/// \brief Return the number of attributes this AttributeSet contains.
unsigned getNumAttributes() const { return NumAttrs; }
/// \brief Get the index of the given "slot" in the AttrNodes list. This index
/// is the index of the return, parameter, or function object that the
/// attributes are applied to, not the index into the AttrNodes list where the
/// attributes reside.
unsigned getSlotIndex(unsigned Slot) const {
return getNode(Slot)->first;
}
/// \brief Retrieve the attributes for the given "slot" in the AttrNode list.
/// \p Slot is an index into the AttrNodes list, not the index of the return /
/// parameter/ function which the attributes apply to.
AttributeSet getSlotAttributes(unsigned Slot) const {
return AttributeSet::get(Context, *getNode(Slot));
}
/// \brief Retrieve the attribute set node for the given "slot" in the
/// AttrNode list.
AttributeSetNode *getSlotNode(unsigned Slot) const {
return getNode(Slot)->second;
}
typedef AttributeSetNode::iterator iterator;
iterator begin(unsigned Slot) const { return getSlotNode(Slot)->begin(); }
iterator end(unsigned Slot) const { return getSlotNode(Slot)->end(); }
void Profile(FoldingSetNodeID &ID) const {
Profile(ID, makeArrayRef(getNode(0), getNumAttributes()));
}
static void Profile(FoldingSetNodeID &ID,
ArrayRef<std::pair<unsigned, AttributeSetNode*> > Nodes) {
for (unsigned i = 0, e = Nodes.size(); i != e; ++i) {
ID.AddInteger(Nodes[i].first);
ID.AddPointer(Nodes[i].second);
}
}
// FIXME: This atrocity is temporary.
uint64_t Raw(unsigned Index) const;
void dump() const;
};
} // end llvm namespace
#endif