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//===- llvm/Attributes.h - Container for Attributes -------------*- 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 contains the simple types necessary to represent the
/// attributes associated with functions and their calls.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_IR_ATTRIBUTES_H
#define LLVM_IR_ATTRIBUTES_H
#include "llvm-c/Types.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/BitmaskEnum.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/Support/Alignment.h"
#include "llvm/Support/CodeGen.h"
#include "llvm/Support/ModRef.h"
#include "llvm/Support/PointerLikeTypeTraits.h"
#include <cassert>
#include <cstdint>
#include <optional>
#include <string>
#include <utility>
namespace llvm {
class AttrBuilder;
class AttributeMask;
class AttributeImpl;
class AttributeListImpl;
class AttributeSetNode;
class ConstantRange;
class ConstantRangeList;
class FoldingSetNodeID;
class Function;
class LLVMContext;
class Type;
class raw_ostream;
enum FPClassTest : unsigned;
enum class AllocFnKind : uint64_t {
Unknown = 0,
Alloc = 1 << 0, // Allocator function returns a new allocation
Realloc = 1 << 1, // Allocator function resizes the `allocptr` argument
Free = 1 << 2, // Allocator function frees the `allocptr` argument
Uninitialized = 1 << 3, // Allocator function returns uninitialized memory
Zeroed = 1 << 4, // Allocator function returns zeroed memory
Aligned = 1 << 5, // Allocator function aligns allocations per the
// `allocalign` argument
LLVM_MARK_AS_BITMASK_ENUM(/* LargestValue = */ Aligned)
};
//===----------------------------------------------------------------------===//
/// \class
/// Functions, function parameters, and return types can have attributes
/// to indicate how they should be treated by optimizations and code
/// generation. This class represents one of those attributes. It's light-weight
/// and should be passed around by-value.
class Attribute {
public:
/// This enumeration lists the attributes that can be associated with
/// parameters, function results, or the function itself.
///
/// Note: The `uwtable' attribute is about the ABI or the user mandating an
/// entry in the unwind table. The `nounwind' attribute is about an exception
/// passing by the function.
///
/// In a theoretical system that uses tables for profiling and SjLj for
/// exceptions, they would be fully independent. In a normal system that uses
/// tables for both, the semantics are:
///
/// nil = Needs an entry because an exception might pass by.
/// nounwind = No need for an entry
/// uwtable = Needs an entry because the ABI says so and because
/// an exception might pass by.
/// uwtable + nounwind = Needs an entry because the ABI says so.
enum AttrKind {
// IR-Level Attributes
None, ///< No attributes have been set
#define GET_ATTR_ENUM
#include "llvm/IR/Attributes.inc"
EndAttrKinds, ///< Sentinel value useful for loops
EmptyKey, ///< Use as Empty key for DenseMap of AttrKind
TombstoneKey, ///< Use as Tombstone key for DenseMap of AttrKind
};
static const unsigned NumIntAttrKinds = LastIntAttr - FirstIntAttr + 1;
static const unsigned NumTypeAttrKinds = LastTypeAttr - FirstTypeAttr + 1;
static bool isEnumAttrKind(AttrKind Kind) {
return Kind >= FirstEnumAttr && Kind <= LastEnumAttr;
}
static bool isIntAttrKind(AttrKind Kind) {
return Kind >= FirstIntAttr && Kind <= LastIntAttr;
}
static bool isTypeAttrKind(AttrKind Kind) {
return Kind >= FirstTypeAttr && Kind <= LastTypeAttr;
}
static bool isConstantRangeAttrKind(AttrKind Kind) {
return Kind >= FirstConstantRangeAttr && Kind <= LastConstantRangeAttr;
}
static bool isConstantRangeListAttrKind(AttrKind Kind) {
return Kind >= FirstConstantRangeListAttr &&
Kind <= LastConstantRangeListAttr;
}
static bool canUseAsFnAttr(AttrKind Kind);
static bool canUseAsParamAttr(AttrKind Kind);
static bool canUseAsRetAttr(AttrKind Kind);
private:
AttributeImpl *pImpl = nullptr;
Attribute(AttributeImpl *A) : pImpl(A) {}
public:
Attribute() = default;
//===--------------------------------------------------------------------===//
// Attribute Construction
//===--------------------------------------------------------------------===//
/// Return a uniquified Attribute object.
static Attribute get(LLVMContext &Context, AttrKind Kind, uint64_t Val = 0);
static Attribute get(LLVMContext &Context, StringRef Kind,
StringRef Val = StringRef());
static Attribute get(LLVMContext &Context, AttrKind Kind, Type *Ty);
static Attribute get(LLVMContext &Context, AttrKind Kind,
const ConstantRange &CR);
static Attribute get(LLVMContext &Context, AttrKind Kind,
ArrayRef<ConstantRange> Val);
/// Return a uniquified Attribute object that has the specific
/// alignment set.
static Attribute getWithAlignment(LLVMContext &Context, Align Alignment);
static Attribute getWithStackAlignment(LLVMContext &Context, Align Alignment);
static Attribute getWithDereferenceableBytes(LLVMContext &Context,
uint64_t Bytes);
static Attribute getWithDereferenceableOrNullBytes(LLVMContext &Context,
uint64_t Bytes);
static Attribute getWithAllocSizeArgs(
LLVMContext &Context, unsigned ElemSizeArg,
const std::optional<unsigned> &NumElemsArg);
static Attribute getWithVScaleRangeArgs(LLVMContext &Context,
unsigned MinValue, unsigned MaxValue);
static Attribute getWithByValType(LLVMContext &Context, Type *Ty);
static Attribute getWithStructRetType(LLVMContext &Context, Type *Ty);
static Attribute getWithByRefType(LLVMContext &Context, Type *Ty);
static Attribute getWithPreallocatedType(LLVMContext &Context, Type *Ty);
static Attribute getWithInAllocaType(LLVMContext &Context, Type *Ty);
static Attribute getWithUWTableKind(LLVMContext &Context, UWTableKind Kind);
static Attribute getWithMemoryEffects(LLVMContext &Context, MemoryEffects ME);
static Attribute getWithNoFPClass(LLVMContext &Context, FPClassTest Mask);
/// For a typed attribute, return the equivalent attribute with the type
/// changed to \p ReplacementTy.
Attribute getWithNewType(LLVMContext &Context, Type *ReplacementTy) {
assert(isTypeAttribute() && "this requires a typed attribute");
return get(Context, getKindAsEnum(), ReplacementTy);
}
static Attribute::AttrKind getAttrKindFromName(StringRef AttrName);
static StringRef getNameFromAttrKind(Attribute::AttrKind AttrKind);
/// Return true if the provided string matches the IR name of an attribute.
/// example: "noalias" return true but not "NoAlias"
static bool isExistingAttribute(StringRef Name);
//===--------------------------------------------------------------------===//
// Attribute Accessors
//===--------------------------------------------------------------------===//
/// Return true if the attribute is an Attribute::AttrKind type.
bool isEnumAttribute() const;
/// Return true if the attribute is an integer attribute.
bool isIntAttribute() const;
/// Return true if the attribute is a string (target-dependent)
/// attribute.
bool isStringAttribute() const;
/// Return true if the attribute is a type attribute.
bool isTypeAttribute() const;
/// Return true if the attribute is a ConstantRange attribute.
bool isConstantRangeAttribute() const;
/// Return true if the attribute is a ConstantRangeList attribute.
bool isConstantRangeListAttribute() const;
/// Return true if the attribute is any kind of attribute.
bool isValid() const { return pImpl; }
/// Return true if the attribute is present.
bool hasAttribute(AttrKind Val) const;
/// Return true if the target-dependent attribute is present.
bool hasAttribute(StringRef Val) const;
/// Return the attribute's kind as an enum (Attribute::AttrKind). This
/// requires the attribute to be an enum, integer, or type attribute.
Attribute::AttrKind getKindAsEnum() const;
/// Return the attribute's value as an integer. This requires that the
/// attribute be an integer attribute.
uint64_t getValueAsInt() const;
/// Return the attribute's value as a boolean. This requires that the
/// attribute be a string attribute.
bool getValueAsBool() const;
/// Return the attribute's kind as a string. This requires the
/// attribute to be a string attribute.
StringRef getKindAsString() const;
/// Return the attribute's value as a string. This requires the
/// attribute to be a string attribute.
StringRef getValueAsString() const;
/// Return the attribute's value as a Type. This requires the attribute to be
/// a type attribute.
Type *getValueAsType() const;
/// Return the attribute's value as a ConstantRange. This requires the
/// attribute to be a ConstantRange attribute.
const ConstantRange &getValueAsConstantRange() const;
/// Return the attribute's value as a ConstantRange array. This requires the
/// attribute to be a ConstantRangeList attribute.
ArrayRef<ConstantRange> getValueAsConstantRangeList() const;
/// Returns the alignment field of an attribute as a byte alignment
/// value.
MaybeAlign getAlignment() const;
/// Returns the stack alignment field of an attribute as a byte
/// alignment value.
MaybeAlign getStackAlignment() const;
/// Returns the number of dereferenceable bytes from the
/// dereferenceable attribute.
uint64_t getDereferenceableBytes() const;
/// Returns the number of dereferenceable_or_null bytes from the
/// dereferenceable_or_null attribute.
uint64_t getDereferenceableOrNullBytes() const;
/// Returns the argument numbers for the allocsize attribute.
std::pair<unsigned, std::optional<unsigned>> getAllocSizeArgs() const;
/// Returns the minimum value for the vscale_range attribute.
unsigned getVScaleRangeMin() const;
/// Returns the maximum value for the vscale_range attribute or std::nullopt
/// when unknown.
std::optional<unsigned> getVScaleRangeMax() const;
// Returns the unwind table kind.
UWTableKind getUWTableKind() const;
// Returns the allocator function kind.
AllocFnKind getAllocKind() const;
/// Returns memory effects.
MemoryEffects getMemoryEffects() const;
/// Return the FPClassTest for nofpclass
FPClassTest getNoFPClass() const;
/// Returns the value of the range attribute.
const ConstantRange &getRange() const;
/// Returns the value of the initializes attribute.
ArrayRef<ConstantRange> getInitializes() const;
/// The Attribute is converted to a string of equivalent mnemonic. This
/// is, presumably, for writing out the mnemonics for the assembly writer.
std::string getAsString(bool InAttrGrp = false) const;
/// Return true if this attribute belongs to the LLVMContext.
bool hasParentContext(LLVMContext &C) const;
/// Equality and non-equality operators.
bool operator==(Attribute A) const { return pImpl == A.pImpl; }
bool operator!=(Attribute A) const { return pImpl != A.pImpl; }
/// Less-than operator. Useful for sorting the attributes list.
bool operator<(Attribute A) const;
void Profile(FoldingSetNodeID &ID) const;
/// Return a raw pointer that uniquely identifies this attribute.
void *getRawPointer() const {
return pImpl;
}
/// Get an attribute from a raw pointer created by getRawPointer.
static Attribute fromRawPointer(void *RawPtr) {
return Attribute(reinterpret_cast<AttributeImpl*>(RawPtr));
}
};
// Specialized opaque value conversions.
inline LLVMAttributeRef wrap(Attribute Attr) {
return reinterpret_cast<LLVMAttributeRef>(Attr.getRawPointer());
}
// Specialized opaque value conversions.
inline Attribute unwrap(LLVMAttributeRef Attr) {
return Attribute::fromRawPointer(Attr);
}
//===----------------------------------------------------------------------===//
/// \class
/// This class holds the attributes for a particular argument, parameter,
/// function, or return value. It is an immutable value type that is cheap to
/// copy. Adding and removing enum attributes is intended to be fast, but adding
/// and removing string or integer attributes involves a FoldingSet lookup.
class AttributeSet {
friend AttributeListImpl;
template <typename Ty, typename Enable> friend struct DenseMapInfo;
// TODO: Extract AvailableAttrs from AttributeSetNode and store them here.
// This will allow an efficient implementation of addAttribute and
// removeAttribute for enum attrs.
/// Private implementation pointer.
AttributeSetNode *SetNode = nullptr;
private:
explicit AttributeSet(AttributeSetNode *ASN) : SetNode(ASN) {}
public:
/// AttributeSet is a trivially copyable value type.
AttributeSet() = default;
AttributeSet(const AttributeSet &) = default;
~AttributeSet() = default;
static AttributeSet get(LLVMContext &C, const AttrBuilder &B);
static AttributeSet get(LLVMContext &C, ArrayRef<Attribute> Attrs);
bool operator==(const AttributeSet &O) const { return SetNode == O.SetNode; }
bool operator!=(const AttributeSet &O) const { return !(*this == O); }
/// Add an argument attribute. Returns a new set because attribute sets are
/// immutable.
[[nodiscard]] AttributeSet addAttribute(LLVMContext &C,
Attribute::AttrKind Kind) const;
/// Add a target-dependent attribute. Returns a new set because attribute sets
/// are immutable.
[[nodiscard]] AttributeSet addAttribute(LLVMContext &C, StringRef Kind,
StringRef Value = StringRef()) const;
/// Add attributes to the attribute set. Returns a new set because attribute
/// sets are immutable.
[[nodiscard]] AttributeSet addAttributes(LLVMContext &C,
AttributeSet AS) const;
/// Remove the specified attribute from this set. Returns a new set because
/// attribute sets are immutable.
[[nodiscard]] AttributeSet removeAttribute(LLVMContext &C,
Attribute::AttrKind Kind) const;
/// Remove the specified attribute from this set. Returns a new set because
/// attribute sets are immutable.
[[nodiscard]] AttributeSet removeAttribute(LLVMContext &C,
StringRef Kind) const;
/// Remove the specified attributes from this set. Returns a new set because
/// attribute sets are immutable.
[[nodiscard]] AttributeSet
removeAttributes(LLVMContext &C, const AttributeMask &AttrsToRemove) const;
/// Return the number of attributes in this set.
unsigned getNumAttributes() const;
/// Return true if attributes exists in this set.
bool hasAttributes() const { return SetNode != nullptr; }
/// Return true if the attribute exists in this set.
bool hasAttribute(Attribute::AttrKind Kind) const;
/// Return true if the attribute exists in this set.
bool hasAttribute(StringRef Kind) const;
/// Return the attribute object.
Attribute getAttribute(Attribute::AttrKind Kind) const;
/// Return the target-dependent attribute object.
Attribute getAttribute(StringRef Kind) const;
MaybeAlign getAlignment() const;
MaybeAlign getStackAlignment() const;
uint64_t getDereferenceableBytes() const;
uint64_t getDereferenceableOrNullBytes() const;
Type *getByValType() const;
Type *getStructRetType() const;
Type *getByRefType() const;
Type *getPreallocatedType() const;
Type *getInAllocaType() const;
Type *getElementType() const;
std::optional<std::pair<unsigned, std::optional<unsigned>>> getAllocSizeArgs()
const;
unsigned getVScaleRangeMin() const;
std::optional<unsigned> getVScaleRangeMax() const;
UWTableKind getUWTableKind() const;
AllocFnKind getAllocKind() const;
MemoryEffects getMemoryEffects() const;
FPClassTest getNoFPClass() const;
std::string getAsString(bool InAttrGrp = false) const;
/// Return true if this attribute set belongs to the LLVMContext.
bool hasParentContext(LLVMContext &C) const;
using iterator = const Attribute *;
iterator begin() const;
iterator end() const;
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
void dump() const;
#endif
};
//===----------------------------------------------------------------------===//
/// \class
/// Provide DenseMapInfo for AttributeSet.
template <> struct DenseMapInfo<AttributeSet, void> {
static AttributeSet getEmptyKey() {
auto Val = static_cast<uintptr_t>(-1);
Val <<= PointerLikeTypeTraits<void *>::NumLowBitsAvailable;
return AttributeSet(reinterpret_cast<AttributeSetNode *>(Val));
}
static AttributeSet getTombstoneKey() {
auto Val = static_cast<uintptr_t>(-2);
Val <<= PointerLikeTypeTraits<void *>::NumLowBitsAvailable;
return AttributeSet(reinterpret_cast<AttributeSetNode *>(Val));
}
static unsigned getHashValue(AttributeSet AS) {
return (unsigned((uintptr_t)AS.SetNode) >> 4) ^
(unsigned((uintptr_t)AS.SetNode) >> 9);
}
static bool isEqual(AttributeSet LHS, AttributeSet RHS) { return LHS == RHS; }
};
//===----------------------------------------------------------------------===//
/// \class
/// This class holds the attributes for a function, its return value, and
/// its parameters. You access the attributes for each of them via an index into
/// the AttributeList object. The function attributes are at index
/// `AttributeList::FunctionIndex', the return value is at index
/// `AttributeList::ReturnIndex', and the attributes for the parameters start at
/// index `AttributeList::FirstArgIndex'.
class AttributeList {
public:
enum AttrIndex : unsigned {
ReturnIndex = 0U,
FunctionIndex = ~0U,
FirstArgIndex = 1,
};
private:
friend class AttrBuilder;
friend class AttributeListImpl;
friend class AttributeSet;
friend class AttributeSetNode;
template <typename Ty, typename Enable> friend struct DenseMapInfo;
/// The attributes that we are managing. This can be null to represent
/// the empty attributes list.
AttributeListImpl *pImpl = nullptr;
public:
/// Create an AttributeList with the specified parameters in it.
static AttributeList get(LLVMContext &C,
ArrayRef<std::pair<unsigned, Attribute>> Attrs);
static AttributeList get(LLVMContext &C,
ArrayRef<std::pair<unsigned, AttributeSet>> Attrs);
/// Create an AttributeList from attribute sets for a function, its
/// return value, and all of its arguments.
static AttributeList get(LLVMContext &C, AttributeSet FnAttrs,
AttributeSet RetAttrs,
ArrayRef<AttributeSet> ArgAttrs);
private:
explicit AttributeList(AttributeListImpl *LI) : pImpl(LI) {}
static AttributeList getImpl(LLVMContext &C, ArrayRef<AttributeSet> AttrSets);
AttributeList setAttributesAtIndex(LLVMContext &C, unsigned Index,
AttributeSet Attrs) const;
public:
AttributeList() = default;
//===--------------------------------------------------------------------===//
// AttributeList Construction and Mutation
//===--------------------------------------------------------------------===//
/// Return an AttributeList with the specified parameters in it.
static AttributeList get(LLVMContext &C, ArrayRef<AttributeList> Attrs);
static AttributeList get(LLVMContext &C, unsigned Index,
ArrayRef<Attribute::AttrKind> Kinds);
static AttributeList get(LLVMContext &C, unsigned Index,
ArrayRef<Attribute::AttrKind> Kinds,
ArrayRef<uint64_t> Values);
static AttributeList get(LLVMContext &C, unsigned Index,
ArrayRef<StringRef> Kind);
static AttributeList get(LLVMContext &C, unsigned Index,
AttributeSet Attrs);
static AttributeList get(LLVMContext &C, unsigned Index,
const AttrBuilder &B);
// TODO: remove non-AtIndex versions of these methods.
/// Add an attribute to the attribute set at the given index.
/// Returns a new list because attribute lists are immutable.
[[nodiscard]] AttributeList
addAttributeAtIndex(LLVMContext &C, unsigned Index,
Attribute::AttrKind Kind) const;
/// Add an attribute to the attribute set at the given index.
/// Returns a new list because attribute lists are immutable.
[[nodiscard]] AttributeList
addAttributeAtIndex(LLVMContext &C, unsigned Index, StringRef Kind,
StringRef Value = StringRef()) const;
/// Add an attribute to the attribute set at the given index.
/// Returns a new list because attribute lists are immutable.
[[nodiscard]] AttributeList
addAttributeAtIndex(LLVMContext &C, unsigned Index, Attribute A) const;
/// Add attributes to the attribute set at the given index.
/// Returns a new list because attribute lists are immutable.
[[nodiscard]] AttributeList addAttributesAtIndex(LLVMContext &C,
unsigned Index,
const AttrBuilder &B) const;
/// Add a function attribute to the list. Returns a new list because
/// attribute lists are immutable.
[[nodiscard]] AttributeList addFnAttribute(LLVMContext &C,
Attribute::AttrKind Kind) const {
return addAttributeAtIndex(C, FunctionIndex, Kind);
}
/// Add a function attribute to the list. Returns a new list because
/// attribute lists are immutable.
[[nodiscard]] AttributeList addFnAttribute(LLVMContext &C,
Attribute Attr) const {
return addAttributeAtIndex(C, FunctionIndex, Attr);
}
/// Add a function attribute to the list. Returns a new list because
/// attribute lists are immutable.
[[nodiscard]] AttributeList
addFnAttribute(LLVMContext &C, StringRef Kind,
StringRef Value = StringRef()) const {
return addAttributeAtIndex(C, FunctionIndex, Kind, Value);
}
/// Add function attribute to the list. Returns a new list because
/// attribute lists are immutable.
[[nodiscard]] AttributeList addFnAttributes(LLVMContext &C,
const AttrBuilder &B) const {
return addAttributesAtIndex(C, FunctionIndex, B);
}
/// Add a return value attribute to the list. Returns a new list because
/// attribute lists are immutable.
[[nodiscard]] AttributeList addRetAttribute(LLVMContext &C,
Attribute::AttrKind Kind) const {
return addAttributeAtIndex(C, ReturnIndex, Kind);
}
/// Add a return value attribute to the list. Returns a new list because
/// attribute lists are immutable.
[[nodiscard]] AttributeList addRetAttribute(LLVMContext &C,
Attribute Attr) const {
return addAttributeAtIndex(C, ReturnIndex, Attr);
}
/// Add a return value attribute to the list. Returns a new list because
/// attribute lists are immutable.
[[nodiscard]] AttributeList addRetAttributes(LLVMContext &C,
const AttrBuilder &B) const {
return addAttributesAtIndex(C, ReturnIndex, B);
}
/// Add an argument attribute to the list. Returns a new list because
/// attribute lists are immutable.
[[nodiscard]] AttributeList
addParamAttribute(LLVMContext &C, unsigned ArgNo,
Attribute::AttrKind Kind) const {
return addAttributeAtIndex(C, ArgNo + FirstArgIndex, Kind);
}
/// Add an argument attribute to the list. Returns a new list because
/// attribute lists are immutable.
[[nodiscard]] AttributeList
addParamAttribute(LLVMContext &C, unsigned ArgNo, StringRef Kind,
StringRef Value = StringRef()) const {
return addAttributeAtIndex(C, ArgNo + FirstArgIndex, Kind, Value);
}
/// Add an attribute to the attribute list at the given arg indices. Returns a
/// new list because attribute lists are immutable.
[[nodiscard]] AttributeList addParamAttribute(LLVMContext &C,
ArrayRef<unsigned> ArgNos,
Attribute A) const;
/// Add an argument attribute to the list. Returns a new list because
/// attribute lists are immutable.
[[nodiscard]] AttributeList addParamAttributes(LLVMContext &C, unsigned ArgNo,
const AttrBuilder &B) const {
return addAttributesAtIndex(C, ArgNo + FirstArgIndex, B);
}
/// Remove the specified attribute at the specified index from this
/// attribute list. Returns a new list because attribute lists are immutable.
[[nodiscard]] AttributeList
removeAttributeAtIndex(LLVMContext &C, unsigned Index,
Attribute::AttrKind Kind) const;
/// Remove the specified attribute at the specified index from this
/// attribute list. Returns a new list because attribute lists are immutable.
[[nodiscard]] AttributeList
removeAttributeAtIndex(LLVMContext &C, unsigned Index, StringRef Kind) const;
[[nodiscard]] AttributeList removeAttribute(LLVMContext &C, unsigned Index,
StringRef Kind) const {
return removeAttributeAtIndex(C, Index, Kind);
}
/// Remove the specified attributes at the specified index from this
/// attribute list. Returns a new list because attribute lists are immutable.
[[nodiscard]] AttributeList
removeAttributesAtIndex(LLVMContext &C, unsigned Index,
const AttributeMask &AttrsToRemove) const;
/// Remove all attributes at the specified index from this
/// attribute list. Returns a new list because attribute lists are immutable.
[[nodiscard]] AttributeList removeAttributesAtIndex(LLVMContext &C,
unsigned Index) const;
/// Remove the specified attribute at the function index from this
/// attribute list. Returns a new list because attribute lists are immutable.
[[nodiscard]] AttributeList
removeFnAttribute(LLVMContext &C, Attribute::AttrKind Kind) const {
return removeAttributeAtIndex(C, FunctionIndex, Kind);
}
/// Remove the specified attribute at the function index from this
/// attribute list. Returns a new list because attribute lists are immutable.
[[nodiscard]] AttributeList removeFnAttribute(LLVMContext &C,
StringRef Kind) const {
return removeAttributeAtIndex(C, FunctionIndex, Kind);
}
/// Remove the specified attribute at the function index from this
/// attribute list. Returns a new list because attribute lists are immutable.
[[nodiscard]] AttributeList
removeFnAttributes(LLVMContext &C, const AttributeMask &AttrsToRemove) const {
return removeAttributesAtIndex(C, FunctionIndex, AttrsToRemove);
}
/// Remove the attributes at the function index from this
/// attribute list. Returns a new list because attribute lists are immutable.
[[nodiscard]] AttributeList removeFnAttributes(LLVMContext &C) const {
return removeAttributesAtIndex(C, FunctionIndex);
}
/// Remove the specified attribute at the return value index from this
/// attribute list. Returns a new list because attribute lists are immutable.
[[nodiscard]] AttributeList
removeRetAttribute(LLVMContext &C, Attribute::AttrKind Kind) const {
return removeAttributeAtIndex(C, ReturnIndex, Kind);
}
/// Remove the specified attribute at the return value index from this
/// attribute list. Returns a new list because attribute lists are immutable.
[[nodiscard]] AttributeList removeRetAttribute(LLVMContext &C,
StringRef Kind) const {
return removeAttributeAtIndex(C, ReturnIndex, Kind);
}
/// Remove the specified attribute at the return value index from this
/// attribute list. Returns a new list because attribute lists are immutable.
[[nodiscard]] AttributeList
removeRetAttributes(LLVMContext &C,
const AttributeMask &AttrsToRemove) const {
return removeAttributesAtIndex(C, ReturnIndex, AttrsToRemove);
}
/// Remove the specified attribute at the specified arg index from this
/// attribute list. Returns a new list because attribute lists are immutable.
[[nodiscard]] AttributeList
removeParamAttribute(LLVMContext &C, unsigned ArgNo,
Attribute::AttrKind Kind) const {
return removeAttributeAtIndex(C, ArgNo + FirstArgIndex, Kind);
}
/// Remove the specified attribute at the specified arg index from this
/// attribute list. Returns a new list because attribute lists are immutable.
[[nodiscard]] AttributeList
removeParamAttribute(LLVMContext &C, unsigned ArgNo, StringRef Kind) const {
return removeAttributeAtIndex(C, ArgNo + FirstArgIndex, Kind);
}
/// Remove the specified attribute at the specified arg index from this
/// attribute list. Returns a new list because attribute lists are immutable.
[[nodiscard]] AttributeList
removeParamAttributes(LLVMContext &C, unsigned ArgNo,
const AttributeMask &AttrsToRemove) const {
return removeAttributesAtIndex(C, ArgNo + FirstArgIndex, AttrsToRemove);
}
/// Remove all attributes at the specified arg index from this
/// attribute list. Returns a new list because attribute lists are immutable.
[[nodiscard]] AttributeList removeParamAttributes(LLVMContext &C,
unsigned ArgNo) const {
return removeAttributesAtIndex(C, ArgNo + FirstArgIndex);
}
/// Replace the type contained by attribute \p AttrKind at index \p ArgNo wih
/// \p ReplacementTy, preserving all other attributes.
[[nodiscard]] AttributeList
replaceAttributeTypeAtIndex(LLVMContext &C, unsigned ArgNo,
Attribute::AttrKind Kind,
Type *ReplacementTy) const {
Attribute Attr = getAttributeAtIndex(ArgNo, Kind);
auto Attrs = removeAttributeAtIndex(C, ArgNo, Kind);
return Attrs.addAttributeAtIndex(C, ArgNo,
Attr.getWithNewType(C, ReplacementTy));
}
/// \brief Add the dereferenceable attribute to the attribute set at the given
/// index. Returns a new list because attribute lists are immutable.
[[nodiscard]] AttributeList addDereferenceableRetAttr(LLVMContext &C,
uint64_t Bytes) const;
/// \brief Add the dereferenceable attribute to the attribute set at the given
/// arg index. Returns a new list because attribute lists are immutable.
[[nodiscard]] AttributeList addDereferenceableParamAttr(LLVMContext &C,
unsigned ArgNo,
uint64_t Bytes) const;
/// Add the dereferenceable_or_null attribute to the attribute set at
/// the given arg index. Returns a new list because attribute lists are
/// immutable.
[[nodiscard]] AttributeList
addDereferenceableOrNullParamAttr(LLVMContext &C, unsigned ArgNo,
uint64_t Bytes) const;
/// Add the range attribute to the attribute set at the return value index.
/// Returns a new list because attribute lists are immutable.
[[nodiscard]] AttributeList addRangeRetAttr(LLVMContext &C,
const ConstantRange &CR) const;
/// Add the allocsize attribute to the attribute set at the given arg index.
/// Returns a new list because attribute lists are immutable.
[[nodiscard]] AttributeList
addAllocSizeParamAttr(LLVMContext &C, unsigned ArgNo, unsigned ElemSizeArg,
const std::optional<unsigned> &NumElemsArg);
//===--------------------------------------------------------------------===//
// AttributeList Accessors
//===--------------------------------------------------------------------===//
/// The attributes for the specified index are returned.
AttributeSet getAttributes(unsigned Index) const;
/// The attributes for the argument or parameter at the given index are
/// returned.
AttributeSet getParamAttrs(unsigned ArgNo) const;
/// The attributes for the ret value are returned.
AttributeSet getRetAttrs() const;
/// The function attributes are returned.
AttributeSet getFnAttrs() const;
/// Return true if the attribute exists at the given index.
bool hasAttributeAtIndex(unsigned Index, Attribute::AttrKind Kind) const;
/// Return true if the attribute exists at the given index.
bool hasAttributeAtIndex(unsigned Index, StringRef Kind) const;
/// Return true if attribute exists at the given index.
bool hasAttributesAtIndex(unsigned Index) const;
/// Return true if the attribute exists for the given argument
bool hasParamAttr(unsigned ArgNo, Attribute::AttrKind Kind) const {
return hasAttributeAtIndex(ArgNo + FirstArgIndex, Kind);
}
/// Return true if the attribute exists for the given argument
bool hasParamAttr(unsigned ArgNo, StringRef Kind) const {
return hasAttributeAtIndex(ArgNo + FirstArgIndex, Kind);
}
/// Return true if attributes exists for the given argument
bool hasParamAttrs(unsigned ArgNo) const {
return hasAttributesAtIndex(ArgNo + FirstArgIndex);
}
/// Return true if the attribute exists for the return value.
bool hasRetAttr(Attribute::AttrKind Kind) const {
return hasAttributeAtIndex(ReturnIndex, Kind);
}
/// Return true if the attribute exists for the return value.
bool hasRetAttr(StringRef Kind) const {
return hasAttributeAtIndex(ReturnIndex, Kind);
}
/// Return true if attributes exist for the return value.
bool hasRetAttrs() const { return hasAttributesAtIndex(ReturnIndex); }
/// Return true if the attribute exists for the function.
bool hasFnAttr(Attribute::AttrKind Kind) const;
/// Return true if the attribute exists for the function.
bool hasFnAttr(StringRef Kind) const;
/// Return true the attributes exist for the function.
bool hasFnAttrs() const { return hasAttributesAtIndex(FunctionIndex); }
/// Return true if the specified attribute is set for at least one
/// parameter or for the return value. If Index is not nullptr, the index
/// of a parameter with the specified attribute is provided.
bool hasAttrSomewhere(Attribute::AttrKind Kind,
unsigned *Index = nullptr) const;
/// Return the attribute object that exists at the given index.
Attribute getAttributeAtIndex(unsigned Index, Attribute::AttrKind Kind) const;
/// Return the attribute object that exists at the given index.
Attribute getAttributeAtIndex(unsigned Index, StringRef Kind) const;
/// Return the attribute object that exists at the arg index.
Attribute getParamAttr(unsigned ArgNo, Attribute::AttrKind Kind) const {
return getAttributeAtIndex(ArgNo + FirstArgIndex, Kind);
}
/// Return the attribute object that exists at the given index.
Attribute getParamAttr(unsigned ArgNo, StringRef Kind) const {
return getAttributeAtIndex(ArgNo + FirstArgIndex, Kind);
}
/// Return the attribute object that exists for the function.
Attribute getFnAttr(Attribute::AttrKind Kind) const {
return getAttributeAtIndex(FunctionIndex, Kind);
}
/// Return the attribute object that exists for the function.
Attribute getFnAttr(StringRef Kind) const {
return getAttributeAtIndex(FunctionIndex, Kind);
}
/// Return the attribute for the given attribute kind for the return value.
Attribute getRetAttr(Attribute::AttrKind Kind) const {
return getAttributeAtIndex(ReturnIndex, Kind);
}
/// Return the alignment of the return value.
MaybeAlign getRetAlignment() const;
/// Return the alignment for the specified function parameter.
MaybeAlign getParamAlignment(unsigned ArgNo) const;
/// Return the stack alignment for the specified function parameter.
MaybeAlign getParamStackAlignment(unsigned ArgNo) const;
/// Return the byval type for the specified function parameter.
Type *getParamByValType(unsigned ArgNo) const;
/// Return the sret type for the specified function parameter.
Type *getParamStructRetType(unsigned ArgNo) const;
/// Return the byref type for the specified function parameter.
Type *getParamByRefType(unsigned ArgNo) const;
/// Return the preallocated type for the specified function parameter.
Type *getParamPreallocatedType(unsigned ArgNo) const;
/// Return the inalloca type for the specified function parameter.
Type *getParamInAllocaType(unsigned ArgNo) const;
/// Return the elementtype type for the specified function parameter.
Type *getParamElementType(unsigned ArgNo) const;
/// Get the stack alignment of the function.
MaybeAlign getFnStackAlignment() const;
/// Get the stack alignment of the return value.
MaybeAlign getRetStackAlignment() const;
/// Get the number of dereferenceable bytes (or zero if unknown) of the return
/// value.
uint64_t getRetDereferenceableBytes() const;
/// Get the number of dereferenceable bytes (or zero if unknown) of an arg.
uint64_t getParamDereferenceableBytes(unsigned Index) const;
/// Get the number of dereferenceable_or_null bytes (or zero if unknown) of
/// the return value.
uint64_t getRetDereferenceableOrNullBytes() const;
/// Get the number of dereferenceable_or_null bytes (or zero if unknown) of an
/// arg.
uint64_t getParamDereferenceableOrNullBytes(unsigned ArgNo) const;
/// Get the disallowed floating-point classes of the return value.
FPClassTest getRetNoFPClass() const;
/// Get the disallowed floating-point classes of the argument value.
FPClassTest getParamNoFPClass(unsigned ArgNo) const;
/// Get the unwind table kind requested for the function.
UWTableKind getUWTableKind() const;
AllocFnKind getAllocKind() const;
/// Returns memory effects of the function.
MemoryEffects getMemoryEffects() const;
/// Return the attributes at the index as a string.
std::string getAsString(unsigned Index, bool InAttrGrp = false) const;
/// Return true if this attribute list belongs to the LLVMContext.
bool hasParentContext(LLVMContext &C) const;
//===--------------------------------------------------------------------===//
// AttributeList Introspection
//===--------------------------------------------------------------------===//
using iterator = const AttributeSet *;
iterator begin() const;
iterator end() const;
unsigned getNumAttrSets() const;
// Implementation of indexes(). Produces iterators that wrap an index. Mostly
// to hide the awkwardness of unsigned wrapping when iterating over valid
// indexes.
struct index_iterator {
unsigned NumAttrSets;
index_iterator(int NumAttrSets) : NumAttrSets(NumAttrSets) {}
struct int_wrapper {
int_wrapper(unsigned i) : i(i) {}
unsigned i;
unsigned operator*() { return i; }
bool operator!=(const int_wrapper &Other) { return i != Other.i; }
int_wrapper &operator++() {
// This is expected to undergo unsigned wrapping since FunctionIndex is
// ~0 and that's where we start.
++i;
return *this;
}
};
int_wrapper begin() { return int_wrapper(AttributeList::FunctionIndex); }
int_wrapper end() { return int_wrapper(NumAttrSets - 1); }
};
/// Use this to iterate over the valid attribute indexes.
index_iterator indexes() const { return index_iterator(getNumAttrSets()); }
/// operator==/!= - Provide equality predicates.
bool operator==(const AttributeList &RHS) const { return pImpl == RHS.pImpl; }
bool operator!=(const AttributeList &RHS) const { return pImpl != RHS.pImpl; }
/// Return a raw pointer that uniquely identifies this attribute list.
void *getRawPointer() const {
return pImpl;
}
/// Return true if there are no attributes.
bool isEmpty() const { return pImpl == nullptr; }
void print(raw_ostream &O) const;
void dump() const;
};
//===----------------------------------------------------------------------===//
/// \class
/// Provide DenseMapInfo for AttributeList.
template <> struct DenseMapInfo<AttributeList, void> {
static AttributeList getEmptyKey() {
auto Val = static_cast<uintptr_t>(-1);
Val <<= PointerLikeTypeTraits<void*>::NumLowBitsAvailable;
return AttributeList(reinterpret_cast<AttributeListImpl *>(Val));
}
static AttributeList getTombstoneKey() {
auto Val = static_cast<uintptr_t>(-2);
Val <<= PointerLikeTypeTraits<void*>::NumLowBitsAvailable;
return AttributeList(reinterpret_cast<AttributeListImpl *>(Val));
}
static unsigned getHashValue(AttributeList AS) {
return (unsigned((uintptr_t)AS.pImpl) >> 4) ^
(unsigned((uintptr_t)AS.pImpl) >> 9);
}
static bool isEqual(AttributeList LHS, AttributeList RHS) {
return LHS == RHS;
}
};
//===----------------------------------------------------------------------===//
/// \class
/// This class is used in conjunction with the Attribute::get method to
/// create an Attribute object. The object itself is uniquified. The Builder's
/// value, however, is not. So this can be used as a quick way to test for
/// equality, presence of attributes, etc.
class AttrBuilder {
LLVMContext &Ctx;
SmallVector<Attribute, 8> Attrs;
public:
AttrBuilder(LLVMContext &Ctx) : Ctx(Ctx) {}
AttrBuilder(const AttrBuilder &) = delete;
AttrBuilder(AttrBuilder &&) = default;
AttrBuilder(LLVMContext &Ctx, const Attribute &A) : Ctx(Ctx) {
addAttribute(A);
}
AttrBuilder(LLVMContext &Ctx, AttributeSet AS);
void clear();
/// Add an attribute to the builder.
AttrBuilder &addAttribute(Attribute::AttrKind Val);
/// Add the Attribute object to the builder.
AttrBuilder &addAttribute(Attribute A);
/// Add the target-dependent attribute to the builder.
AttrBuilder &addAttribute(StringRef A, StringRef V = StringRef());
/// Remove an attribute from the builder.
AttrBuilder &removeAttribute(Attribute::AttrKind Val);
/// Remove the target-dependent attribute from the builder.
AttrBuilder &removeAttribute(StringRef A);
/// Remove the target-dependent attribute from the builder.
AttrBuilder &removeAttribute(Attribute A) {
if (A.isStringAttribute())
return removeAttribute(A.getKindAsString());
else
return removeAttribute(A.getKindAsEnum());
}
/// Add the attributes from the builder. Attributes in the passed builder
/// overwrite attributes in this builder if they have the same key.
AttrBuilder &merge(const AttrBuilder &B);
/// Remove the attributes from the builder.
AttrBuilder &remove(const AttributeMask &AM);
/// Return true if the builder has any attribute that's in the
/// specified builder.
bool overlaps(const AttributeMask &AM) const;
/// Return true if the builder has the specified attribute.
bool contains(Attribute::AttrKind A) const;
/// Return true if the builder has the specified target-dependent
/// attribute.
bool contains(StringRef A) const;
/// Return true if the builder has IR-level attributes.
bool hasAttributes() const { return !Attrs.empty(); }
/// Return Attribute with the given Kind. The returned attribute will be
/// invalid if the Kind is not present in the builder.
Attribute getAttribute(Attribute::AttrKind Kind) const;
/// Return Attribute with the given Kind. The returned attribute will be
/// invalid if the Kind is not present in the builder.
Attribute getAttribute(StringRef Kind) const;
/// Return raw (possibly packed/encoded) value of integer attribute or
/// std::nullopt if not set.
std::optional<uint64_t> getRawIntAttr(Attribute::AttrKind Kind) const;
/// Retrieve the alignment attribute, if it exists.
MaybeAlign getAlignment() const {
return MaybeAlign(getRawIntAttr(Attribute::Alignment).value_or(0));
}
/// Retrieve the stack alignment attribute, if it exists.
MaybeAlign getStackAlignment() const {
return MaybeAlign(getRawIntAttr(Attribute::StackAlignment).value_or(0));
}
/// Retrieve the number of dereferenceable bytes, if the
/// dereferenceable attribute exists (zero is returned otherwise).
uint64_t getDereferenceableBytes() const {
return getRawIntAttr(Attribute::Dereferenceable).value_or(0);
}
/// Retrieve the number of dereferenceable_or_null bytes, if the
/// dereferenceable_or_null attribute exists (zero is returned otherwise).
uint64_t getDereferenceableOrNullBytes() const {
return getRawIntAttr(Attribute::DereferenceableOrNull).value_or(0);
}
/// Retrieve type for the given type attribute.
Type *getTypeAttr(Attribute::AttrKind Kind) const;
/// Retrieve the byval type.
Type *getByValType() const { return getTypeAttr(Attribute::ByVal); }
/// Retrieve the sret type.
Type *getStructRetType() const { return getTypeAttr(Attribute::StructRet); }
/// Retrieve the byref type.
Type *getByRefType() const { return getTypeAttr(Attribute::ByRef); }
/// Retrieve the preallocated type.
Type *getPreallocatedType() const {
return getTypeAttr(Attribute::Preallocated);
}
/// Retrieve the inalloca type.
Type *getInAllocaType() const { return getTypeAttr(Attribute::InAlloca); }
/// Retrieve the allocsize args, or std::nullopt if the attribute does not
/// exist.
std::optional<std::pair<unsigned, std::optional<unsigned>>> getAllocSizeArgs()
const;
/// Add integer attribute with raw value (packed/encoded if necessary).
AttrBuilder &addRawIntAttr(Attribute::AttrKind Kind, uint64_t Value);
/// This turns an alignment into the form used internally in Attribute.
/// This call has no effect if Align is not set.
AttrBuilder &addAlignmentAttr(MaybeAlign Align);
/// This turns an int alignment (which must be a power of 2) into the
/// form used internally in Attribute.
/// This call has no effect if Align is 0.
/// Deprecated, use the version using a MaybeAlign.
inline AttrBuilder &addAlignmentAttr(unsigned Align) {
return addAlignmentAttr(MaybeAlign(Align));
}
/// This turns a stack alignment into the form used internally in Attribute.
/// This call has no effect if Align is not set.
AttrBuilder &addStackAlignmentAttr(MaybeAlign Align);
/// This turns an int stack alignment (which must be a power of 2) into
/// the form used internally in Attribute.
/// This call has no effect if Align is 0.
/// Deprecated, use the version using a MaybeAlign.
inline AttrBuilder &addStackAlignmentAttr(unsigned Align) {
return addStackAlignmentAttr(MaybeAlign(Align));
}
/// This turns the number of dereferenceable bytes into the form used
/// internally in Attribute.
AttrBuilder &addDereferenceableAttr(uint64_t Bytes);
/// This turns the number of dereferenceable_or_null bytes into the
/// form used internally in Attribute.
AttrBuilder &addDereferenceableOrNullAttr(uint64_t Bytes);
/// This turns one (or two) ints into the form used internally in Attribute.
AttrBuilder &addAllocSizeAttr(unsigned ElemSizeArg,
const std::optional<unsigned> &NumElemsArg);
/// This turns two ints into the form used internally in Attribute.
AttrBuilder &addVScaleRangeAttr(unsigned MinValue,
std::optional<unsigned> MaxValue);
/// Add a type attribute with the given type.
AttrBuilder &addTypeAttr(Attribute::AttrKind Kind, Type *Ty);
/// This turns a byval type into the form used internally in Attribute.
AttrBuilder &addByValAttr(Type *Ty);
/// This turns a sret type into the form used internally in Attribute.
AttrBuilder &addStructRetAttr(Type *Ty);
/// This turns a byref type into the form used internally in Attribute.
AttrBuilder &addByRefAttr(Type *Ty);
/// This turns a preallocated type into the form used internally in Attribute.
AttrBuilder &addPreallocatedAttr(Type *Ty);
/// This turns an inalloca type into the form used internally in Attribute.
AttrBuilder &addInAllocaAttr(Type *Ty);
/// Add an allocsize attribute, using the representation returned by
/// Attribute.getIntValue().
AttrBuilder &addAllocSizeAttrFromRawRepr(uint64_t RawAllocSizeRepr);
/// Add a vscale_range attribute, using the representation returned by
/// Attribute.getIntValue().
AttrBuilder &addVScaleRangeAttrFromRawRepr(uint64_t RawVScaleRangeRepr);
/// This turns the unwind table kind into the form used internally in
/// Attribute.
AttrBuilder &addUWTableAttr(UWTableKind Kind);
// This turns the allocator kind into the form used internally in Attribute.
AttrBuilder &addAllocKindAttr(AllocFnKind Kind);
/// Add memory effect attribute.
AttrBuilder &addMemoryAttr(MemoryEffects ME);
// Add nofpclass attribute
AttrBuilder &addNoFPClassAttr(FPClassTest NoFPClassMask);
/// Add a ConstantRange attribute with the given range.
AttrBuilder &addConstantRangeAttr(Attribute::AttrKind Kind,
const ConstantRange &CR);
/// Add range attribute.
AttrBuilder &addRangeAttr(const ConstantRange &CR);
/// Add a ConstantRangeList attribute with the given ranges.
AttrBuilder &addConstantRangeListAttr(Attribute::AttrKind Kind,
ArrayRef<ConstantRange> Val);
/// Add initializes attribute.
AttrBuilder &addInitializesAttr(const ConstantRangeList &CRL);
ArrayRef<Attribute> attrs() const { return Attrs; }
bool operator==(const AttrBuilder &B) const;
bool operator!=(const AttrBuilder &B) const { return !(*this == B); }
};
namespace AttributeFuncs {
enum AttributeSafetyKind : uint8_t {
ASK_SAFE_TO_DROP = 1,
ASK_UNSAFE_TO_DROP = 2,
ASK_ALL = ASK_SAFE_TO_DROP | ASK_UNSAFE_TO_DROP,
};
/// Returns true if this is a type legal for the 'nofpclass' attribute. This
/// follows the same type rules as FPMathOperator.
bool isNoFPClassCompatibleType(Type *Ty);
/// Which attributes cannot be applied to a type. The argument \p ASK indicates,
/// if only attributes that are known to be safely droppable are contained in
/// the mask; only attributes that might be unsafe to drop (e.g., ABI-related
/// attributes) are in the mask; or both.
AttributeMask typeIncompatible(Type *Ty, AttributeSafetyKind ASK = ASK_ALL);
/// Get param/return attributes which imply immediate undefined behavior if an
/// invalid value is passed. For example, this includes noundef (where undef
/// implies UB), but not nonnull (where null implies poison). It also does not
/// include attributes like nocapture, which constrain the function
/// implementation rather than the passed value.
AttributeMask getUBImplyingAttributes();
/// \returns Return true if the two functions have compatible target-independent
/// attributes for inlining purposes.
bool areInlineCompatible(const Function &Caller, const Function &Callee);
/// Checks if there are any incompatible function attributes between
/// \p A and \p B.
///
/// \param [in] A - The first function to be compared with.
/// \param [in] B - The second function to be compared with.
/// \returns true if the functions have compatible attributes.
bool areOutlineCompatible(const Function &A, const Function &B);
/// Merge caller's and callee's attributes.
void mergeAttributesForInlining(Function &Caller, const Function &Callee);
/// Merges the functions attributes from \p ToMerge into function \p Base.
///
/// \param [in,out] Base - The function being merged into.
/// \param [in] ToMerge - The function to merge attributes from.
void mergeAttributesForOutlining(Function &Base, const Function &ToMerge);
/// Update min-legal-vector-width if it is in Attribute and less than Width.
void updateMinLegalVectorWidthAttr(Function &Fn, uint64_t Width);
} // end namespace AttributeFuncs
} // end namespace llvm
#endif // LLVM_IR_ATTRIBUTES_H
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