EIC code displayed by LXR master/​include/​clang/​Basic/​TargetInfo.h	Source navigation Diff markup Identifier search General search
	Version: master test Revert   Change

File indexing completed on 2026-05-10 08:36:51

 //===--- TargetInfo.h - Expose information about the target -----*- 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
 /// Defines the clang::TargetInfo interface.
 ///
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_CLANG_BASIC_TARGETINFO_H
 #define LLVM_CLANG_BASIC_TARGETINFO_H
 
 #include "clang/Basic/AddressSpaces.h"
 #include "clang/Basic/BitmaskEnum.h"
 #include "clang/Basic/CFProtectionOptions.h"
 #include "clang/Basic/CodeGenOptions.h"
 #include "clang/Basic/LLVM.h"
 #include "clang/Basic/LangOptions.h"
 #include "clang/Basic/Specifiers.h"
 #include "clang/Basic/TargetCXXABI.h"
 #include "clang/Basic/TargetOptions.h"
 #include "llvm/ADT/APFloat.h"
 #include "llvm/ADT/APInt.h"
 #include "llvm/ADT/APSInt.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/IntrusiveRefCntPtr.h"
 #include "llvm/ADT/SmallSet.h"
 #include "llvm/ADT/StringMap.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/StringSet.h"
 #include "llvm/Frontend/OpenMP/OMPGridValues.h"
 #include "llvm/IR/DerivedTypes.h"
 #include "llvm/Support/DataTypes.h"
 #include "llvm/Support/Error.h"
 #include "llvm/Support/VersionTuple.h"
 #include "llvm/TargetParser/Triple.h"
 #include <cassert>
 #include <optional>
 #include <string>
 #include <utility>
 #include <vector>
 
 namespace llvm {
 struct fltSemantics;
 }
 
 namespace clang {
 class DiagnosticsEngine;
 class LangOptions;
 class CodeGenOptions;
 class MacroBuilder;
 
 /// Contains information gathered from parsing the contents of TargetAttr.
 struct ParsedTargetAttr {
   std::vector<std::string> Features;
   StringRef CPU;
   StringRef Tune;
   StringRef BranchProtection;
   StringRef Duplicate;
   bool operator ==(const ParsedTargetAttr &Other) const {
     return Duplicate == Other.Duplicate && CPU == Other.CPU &&
            Tune == Other.Tune && BranchProtection == Other.BranchProtection &&
            Features == Other.Features;
   }
 };
 
 namespace Builtin { struct Info; }
 
 enum class FloatModeKind {
   NoFloat = 0,
   Half = 1 << 0,
   Float = 1 << 1,
   Double = 1 << 2,
   LongDouble = 1 << 3,
   Float128 = 1 << 4,
   Ibm128 = 1 << 5,
   LLVM_MARK_AS_BITMASK_ENUM(Ibm128)
 };
 
 /// Fields controlling how types are laid out in memory; these may need to
 /// be copied for targets like AMDGPU that base their ABIs on an auxiliary
 /// CPU target.
 struct TransferrableTargetInfo {
   unsigned char PointerWidth, PointerAlign;
   unsigned char BoolWidth, BoolAlign;
   unsigned char ShortWidth, ShortAlign;
   unsigned char IntWidth, IntAlign;
   unsigned char HalfWidth, HalfAlign;
   unsigned char BFloat16Width, BFloat16Align;
   unsigned char FloatWidth, FloatAlign;
   unsigned char DoubleWidth, DoubleAlign;
   unsigned char LongDoubleWidth, LongDoubleAlign, Float128Align, Ibm128Align;
   unsigned char LargeArrayMinWidth, LargeArrayAlign;
   unsigned char LongWidth, LongAlign;
   unsigned char LongLongWidth, LongLongAlign;
   unsigned char Int128Align;
 
   // This is an optional parameter for targets that
   // don't use 'LongLongAlign' for '_BitInt' max alignment
   std::optional<unsigned> BitIntMaxAlign;
 
   // Fixed point bit widths
   unsigned char ShortAccumWidth, ShortAccumAlign;
   unsigned char AccumWidth, AccumAlign;
   unsigned char LongAccumWidth, LongAccumAlign;
   unsigned char ShortFractWidth, ShortFractAlign;
   unsigned char FractWidth, FractAlign;
   unsigned char LongFractWidth, LongFractAlign;
 
   // If true, unsigned fixed point types have the same number of fractional bits
   // as their signed counterparts, forcing the unsigned types to have one extra
   // bit of padding. Otherwise, unsigned fixed point types have
   // one more fractional bit than its corresponding signed type. This is false
   // by default.
   bool PaddingOnUnsignedFixedPoint;
 
   // Fixed point integral and fractional bit sizes
   // Saturated types share the same integral/fractional bits as their
   // corresponding unsaturated types.
   // For simplicity, the fractional bits in a _Fract type will be one less the
   // width of that _Fract type. This leaves all signed _Fract types having no
   // padding and unsigned _Fract types will only have 1 bit of padding after the
   // sign if PaddingOnUnsignedFixedPoint is set.
   unsigned char ShortAccumScale;
   unsigned char AccumScale;
   unsigned char LongAccumScale;
 
   unsigned char DefaultAlignForAttributeAligned;
   unsigned char MinGlobalAlign;
 
   unsigned short SuitableAlign;
   unsigned short NewAlign;
   unsigned MaxVectorAlign;
   unsigned MaxTLSAlign;
 
   const llvm::fltSemantics *HalfFormat, *BFloat16Format, *FloatFormat,
       *DoubleFormat, *LongDoubleFormat, *Float128Format, *Ibm128Format;
 
   ///===---- Target Data Type Query Methods -------------------------------===//
   enum IntType {
     NoInt = 0,
     SignedChar,
     UnsignedChar,
     SignedShort,
     UnsignedShort,
     SignedInt,
     UnsignedInt,
     SignedLong,
     UnsignedLong,
     SignedLongLong,
     UnsignedLongLong
   };
 
 protected:
   IntType SizeType, IntMaxType, PtrDiffType, IntPtrType, WCharType, WIntType,
       Char16Type, Char32Type, Int64Type, Int16Type, SigAtomicType,
       ProcessIDType;
 
   /// Whether Objective-C's built-in boolean type should be signed char.
   ///
   /// Otherwise, when this flag is not set, the normal built-in boolean type is
   /// used.
   LLVM_PREFERRED_TYPE(bool)
   unsigned UseSignedCharForObjCBool : 1;
 
   /// Control whether the alignment of bit-field types is respected when laying
   /// out structures. If true, then the alignment of the bit-field type will be
   /// used to (a) impact the alignment of the containing structure, and (b)
   /// ensure that the individual bit-field will not straddle an alignment
   /// boundary.
   LLVM_PREFERRED_TYPE(bool)
   unsigned UseBitFieldTypeAlignment : 1;
 
   /// Whether zero length bitfields (e.g., int : 0;) force alignment of
   /// the next bitfield.
   ///
   /// If the alignment of the zero length bitfield is greater than the member
   /// that follows it, `bar', `bar' will be aligned as the type of the
   /// zero-length bitfield.
   LLVM_PREFERRED_TYPE(bool)
   unsigned UseZeroLengthBitfieldAlignment : 1;
 
   /// Whether zero length bitfield alignment is respected if they are the
   /// leading members.
   LLVM_PREFERRED_TYPE(bool)
   unsigned UseLeadingZeroLengthBitfield : 1;
 
   ///  Whether explicit bit field alignment attributes are honored.
   LLVM_PREFERRED_TYPE(bool)
   unsigned UseExplicitBitFieldAlignment : 1;
 
   /// If non-zero, specifies a fixed alignment value for bitfields that follow
   /// zero length bitfield, regardless of the zero length bitfield type.
   unsigned ZeroLengthBitfieldBoundary;
 
   /// If non-zero, specifies a maximum alignment to truncate alignment
   /// specified in the aligned attribute of a static variable to this value.
   unsigned MaxAlignedAttribute;
 };
 
 /// OpenCL type kinds.
 enum OpenCLTypeKind : uint8_t {
   OCLTK_Default,
   OCLTK_ClkEvent,
   OCLTK_Event,
   OCLTK_Image,
   OCLTK_Pipe,
   OCLTK_Queue,
   OCLTK_ReserveID,
   OCLTK_Sampler,
 };
 
 /// Exposes information about the current target.
 ///
 class TargetInfo : public TransferrableTargetInfo,
                    public RefCountedBase<TargetInfo> {
   std::shared_ptr<TargetOptions> TargetOpts;
   llvm::Triple Triple;
 protected:
   // Target values set by the ctor of the actual target implementation.  Default
   // values are specified by the TargetInfo constructor.
   bool BigEndian;
   bool TLSSupported;
   bool VLASupported;
   bool NoAsmVariants;  // True if {|} are normal characters.
   bool HasLegalHalfType; // True if the backend supports operations on the half
                          // LLVM IR type.
   bool HalfArgsAndReturns;
   bool HasFloat128;
   bool HasFloat16;
   bool HasBFloat16;
   bool HasFullBFloat16; // True if the backend supports native bfloat16
                         // arithmetic. Used to determine excess precision
                         // support in the frontend.
   bool HasIbm128;
   bool HasLongDouble;
   bool HasFPReturn;
   bool HasStrictFP;
 
   unsigned char MaxAtomicPromoteWidth, MaxAtomicInlineWidth;
   std::string DataLayoutString;
   const char *UserLabelPrefix;
   const char *MCountName;
   unsigned char RegParmMax, SSERegParmMax;
   TargetCXXABI TheCXXABI;
   const LangASMap *AddrSpaceMap;
 
   mutable StringRef PlatformName;
   mutable VersionTuple PlatformMinVersion;
 
   LLVM_PREFERRED_TYPE(bool)
   unsigned HasAlignMac68kSupport : 1;
   LLVM_PREFERRED_TYPE(FloatModeKind)
   unsigned RealTypeUsesObjCFPRetMask : llvm::BitWidth<FloatModeKind>;
   LLVM_PREFERRED_TYPE(bool)
   unsigned ComplexLongDoubleUsesFP2Ret : 1;
 
   LLVM_PREFERRED_TYPE(bool)
   unsigned HasBuiltinMSVaList : 1;
 
   LLVM_PREFERRED_TYPE(bool)
   unsigned HasAArch64SVETypes : 1;
 
   LLVM_PREFERRED_TYPE(bool)
   unsigned HasRISCVVTypes : 1;
 
   LLVM_PREFERRED_TYPE(bool)
   unsigned AllowAMDGPUUnsafeFPAtomics : 1;
 
   LLVM_PREFERRED_TYPE(bool)
   unsigned HasUnalignedAccess : 1;
 
   unsigned ARMCDECoprocMask : 8;
 
   unsigned MaxOpenCLWorkGroupSize;
 
   std::optional<unsigned> MaxBitIntWidth;
 
   std::optional<llvm::Triple> DarwinTargetVariantTriple;
 
   // TargetInfo Constructor.  Default initializes all fields.
   TargetInfo(const llvm::Triple &T);
 
   // UserLabelPrefix must match DL's getGlobalPrefix() when interpreted
   // as a DataLayout object.
   void resetDataLayout(StringRef DL, const char *UserLabelPrefix = "");
 
   // Target features that are read-only and should not be disabled/enabled
   // by command line options. Such features are for emitting predefined
   // macros or checking availability of builtin functions and can be omitted
   // in function attributes in IR.
   llvm::StringSet<> ReadOnlyFeatures;
 
 public:
   /// Construct a target for the given options.
   ///
   /// \param Opts - The options to use to initialize the target. The target may
   /// modify the options to canonicalize the target feature information to match
   /// what the backend expects.
   static TargetInfo *
   CreateTargetInfo(DiagnosticsEngine &Diags,
                    const std::shared_ptr<TargetOptions> &Opts);
 
   virtual ~TargetInfo();
 
   /// Retrieve the target options.
   TargetOptions &getTargetOpts() const {
     assert(TargetOpts && "Missing target options");
     return *TargetOpts;
   }
 
   /// The different kinds of __builtin_va_list types defined by
   /// the target implementation.
   enum BuiltinVaListKind {
     /// typedef char* __builtin_va_list;
     CharPtrBuiltinVaList = 0,
 
     /// typedef void* __builtin_va_list;
     VoidPtrBuiltinVaList,
 
     /// __builtin_va_list as defined by the AArch64 ABI
     /// http://infocenter.arm.com/help/topic/com.arm.doc.ihi0055a/IHI0055A_aapcs64.pdf
     AArch64ABIBuiltinVaList,
 
     /// __builtin_va_list as defined by the PNaCl ABI:
     /// http://www.chromium.org/nativeclient/pnacl/bitcode-abi#TOC-Machine-Types
     PNaClABIBuiltinVaList,
 
     /// __builtin_va_list as defined by the Power ABI:
     /// https://www.power.org
     ///        /resources/downloads/Power-Arch-32-bit-ABI-supp-1.0-Embedded.pdf
     PowerABIBuiltinVaList,
 
     /// __builtin_va_list as defined by the x86-64 ABI:
     /// http://refspecs.linuxbase.org/elf/x86_64-abi-0.21.pdf
     X86_64ABIBuiltinVaList,
 
     /// __builtin_va_list as defined by ARM AAPCS ABI
     /// http://infocenter.arm.com
     //        /help/topic/com.arm.doc.ihi0042d/IHI0042D_aapcs.pdf
     AAPCSABIBuiltinVaList,
 
     // typedef struct __va_list_tag
     //   {
     //     long __gpr;
     //     long __fpr;
     //     void *__overflow_arg_area;
     //     void *__reg_save_area;
     //   } va_list[1];
     SystemZBuiltinVaList,
 
     // typedef struct __va_list_tag {
     //    void *__current_saved_reg_area_pointer;
     //    void *__saved_reg_area_end_pointer;
     //    void *__overflow_area_pointer;
     //} va_list;
     HexagonBuiltinVaList,
 
     // typedef struct __va_list_tag {
     //    int* __va_stk;
     //    int* __va_reg;
     //    int __va_ndx;
     //} va_list;
     XtensaABIBuiltinVaList
   };
 
 protected:
   /// Specify if mangling based on address space map should be used or
   /// not for language specific address spaces
   bool UseAddrSpaceMapMangling;
 
 public:
   IntType getSizeType() const { return SizeType; }
   IntType getSignedSizeType() const {
     switch (SizeType) {
     case UnsignedShort:
       return SignedShort;
     case UnsignedInt:
       return SignedInt;
     case UnsignedLong:
       return SignedLong;
     case UnsignedLongLong:
       return SignedLongLong;
     default:
       llvm_unreachable("Invalid SizeType");
     }
   }
   IntType getIntMaxType() const { return IntMaxType; }
   IntType getUIntMaxType() const {
     return getCorrespondingUnsignedType(IntMaxType);
   }
   IntType getPtrDiffType(LangAS AddrSpace) const {
     return AddrSpace == LangAS::Default ? PtrDiffType
                                         : getPtrDiffTypeV(AddrSpace);
   }
   IntType getUnsignedPtrDiffType(LangAS AddrSpace) const {
     return getCorrespondingUnsignedType(getPtrDiffType(AddrSpace));
   }
   IntType getIntPtrType() const { return IntPtrType; }
   IntType getUIntPtrType() const {
     return getCorrespondingUnsignedType(IntPtrType);
   }
   IntType getWCharType() const { return WCharType; }
   IntType getWIntType() const { return WIntType; }
   IntType getChar16Type() const { return Char16Type; }
   IntType getChar32Type() const { return Char32Type; }
   IntType getInt64Type() const { return Int64Type; }
   IntType getUInt64Type() const {
     return getCorrespondingUnsignedType(Int64Type);
   }
   IntType getInt16Type() const { return Int16Type; }
   IntType getUInt16Type() const {
     return getCorrespondingUnsignedType(Int16Type);
   }
   IntType getSigAtomicType() const { return SigAtomicType; }
   IntType getProcessIDType() const { return ProcessIDType; }
 
   static IntType getCorrespondingUnsignedType(IntType T) {
     switch (T) {
     case SignedChar:
       return UnsignedChar;
     case SignedShort:
       return UnsignedShort;
     case SignedInt:
       return UnsignedInt;
     case SignedLong:
       return UnsignedLong;
     case SignedLongLong:
       return UnsignedLongLong;
     default:
       llvm_unreachable("Unexpected signed integer type");
     }
   }
 
   /// In the event this target uses the same number of fractional bits for its
   /// unsigned types as it does with its signed counterparts, there will be
   /// exactly one bit of padding.
   /// Return true if unsigned fixed point types have padding for this target.
   bool doUnsignedFixedPointTypesHavePadding() const {
     return PaddingOnUnsignedFixedPoint;
   }
 
   /// Return the width (in bits) of the specified integer type enum.
   ///
   /// For example, SignedInt -> getIntWidth().
   unsigned getTypeWidth(IntType T) const;
 
   /// Return integer type with specified width.
   virtual IntType getIntTypeByWidth(unsigned BitWidth, bool IsSigned) const;
 
   /// Return the smallest integer type with at least the specified width.
   virtual IntType getLeastIntTypeByWidth(unsigned BitWidth,
                                          bool IsSigned) const;
 
   /// Return floating point type with specified width. On PPC, there are
   /// three possible types for 128-bit floating point: "PPC double-double",
   /// IEEE 754R quad precision, and "long double" (which under the covers
   /// is represented as one of those two). At this time, there is no support
   /// for an explicit "PPC double-double" type (i.e. __ibm128) so we only
   /// need to differentiate between "long double" and IEEE quad precision.
   FloatModeKind getRealTypeByWidth(unsigned BitWidth,
                                    FloatModeKind ExplicitType) const;
 
   /// Return the alignment (in bits) of the specified integer type enum.
   ///
   /// For example, SignedInt -> getIntAlign().
   unsigned getTypeAlign(IntType T) const;
 
   /// Returns true if the type is signed; false otherwise.
   static bool isTypeSigned(IntType T);
 
   /// Return the width of pointers on this target, for the
   /// specified address space.
   uint64_t getPointerWidth(LangAS AddrSpace) const {
     return AddrSpace == LangAS::Default ? PointerWidth
                                         : getPointerWidthV(AddrSpace);
   }
   uint64_t getPointerAlign(LangAS AddrSpace) const {
     return AddrSpace == LangAS::Default ? PointerAlign
                                         : getPointerAlignV(AddrSpace);
   }
 
   /// Return the maximum width of pointers on this target.
   virtual uint64_t getMaxPointerWidth() const {
     return PointerWidth;
   }
 
   /// Get integer value for null pointer.
   /// \param AddrSpace address space of pointee in source language.
   virtual uint64_t getNullPointerValue(LangAS AddrSpace) const { return 0; }
 
   /// Returns true if an address space can be safely converted to another.
   /// \param A address space of target in source language.
   /// \param B address space of source in source language.
   virtual bool isAddressSpaceSupersetOf(LangAS A, LangAS B) const {
     return A == B;
   }
 
   /// Return the size of '_Bool' and C++ 'bool' for this target, in bits.
   unsigned getBoolWidth() const { return BoolWidth; }
 
   /// Return the alignment of '_Bool' and C++ 'bool' for this target.
   unsigned getBoolAlign() const { return BoolAlign; }
 
   unsigned getCharWidth() const { return 8; } // FIXME
   unsigned getCharAlign() const { return 8; } // FIXME
 
   /// getShortWidth/Align - Return the size of 'signed short' and
   /// 'unsigned short' for this target, in bits.
   unsigned getShortWidth() const { return ShortWidth; }
   unsigned getShortAlign() const { return ShortAlign; }
 
   /// getIntWidth/Align - Return the size of 'signed int' and 'unsigned int' for
   /// this target, in bits.
   unsigned getIntWidth() const { return IntWidth; }
   unsigned getIntAlign() const { return IntAlign; }
 
   /// getLongWidth/Align - Return the size of 'signed long' and 'unsigned long'
   /// for this target, in bits.
   unsigned getLongWidth() const { return LongWidth; }
   unsigned getLongAlign() const { return LongAlign; }
 
   /// getLongLongWidth/Align - Return the size of 'signed long long' and
   /// 'unsigned long long' for this target, in bits.
   unsigned getLongLongWidth() const { return LongLongWidth; }
   unsigned getLongLongAlign() const { return LongLongAlign; }
 
   /// getInt128Align() - Returns the alignment of Int128.
   unsigned getInt128Align() const { return Int128Align; }
 
   /// getBitIntMaxAlign() - Returns the maximum possible alignment of
   /// '_BitInt' and 'unsigned _BitInt'.
   unsigned getBitIntMaxAlign() const {
     return BitIntMaxAlign.value_or(LongLongAlign);
   }
 
   /// getBitIntAlign/Width - Return aligned size of '_BitInt' and
   /// 'unsigned _BitInt' for this target, in bits.
   unsigned getBitIntWidth(unsigned NumBits) const {
     return llvm::alignTo(NumBits, getBitIntAlign(NumBits));
   }
   unsigned getBitIntAlign(unsigned NumBits) const {
     return std::clamp<unsigned>(llvm::PowerOf2Ceil(NumBits), getCharWidth(),
                                 getBitIntMaxAlign());
   }
 
   /// getShortAccumWidth/Align - Return the size of 'signed short _Accum' and
   /// 'unsigned short _Accum' for this target, in bits.
   unsigned getShortAccumWidth() const { return ShortAccumWidth; }
   unsigned getShortAccumAlign() const { return ShortAccumAlign; }
 
   /// getAccumWidth/Align - Return the size of 'signed _Accum' and
   /// 'unsigned _Accum' for this target, in bits.
   unsigned getAccumWidth() const { return AccumWidth; }
   unsigned getAccumAlign() const { return AccumAlign; }
 
   /// getLongAccumWidth/Align - Return the size of 'signed long _Accum' and
   /// 'unsigned long _Accum' for this target, in bits.
   unsigned getLongAccumWidth() const { return LongAccumWidth; }
   unsigned getLongAccumAlign() const { return LongAccumAlign; }
 
   /// getShortFractWidth/Align - Return the size of 'signed short _Fract' and
   /// 'unsigned short _Fract' for this target, in bits.
   unsigned getShortFractWidth() const { return ShortFractWidth; }
   unsigned getShortFractAlign() const { return ShortFractAlign; }
 
   /// getFractWidth/Align - Return the size of 'signed _Fract' and
   /// 'unsigned _Fract' for this target, in bits.
   unsigned getFractWidth() const { return FractWidth; }
   unsigned getFractAlign() const { return FractAlign; }
 
   /// getLongFractWidth/Align - Return the size of 'signed long _Fract' and
   /// 'unsigned long _Fract' for this target, in bits.
   unsigned getLongFractWidth() const { return LongFractWidth; }
   unsigned getLongFractAlign() const { return LongFractAlign; }
 
   /// getShortAccumScale/IBits - Return the number of fractional/integral bits
   /// in a 'signed short _Accum' type.
   unsigned getShortAccumScale() const { return ShortAccumScale; }
   unsigned getShortAccumIBits() const {
     return ShortAccumWidth - ShortAccumScale - 1;
   }
 
   /// getAccumScale/IBits - Return the number of fractional/integral bits
   /// in a 'signed _Accum' type.
   unsigned getAccumScale() const { return AccumScale; }
   unsigned getAccumIBits() const { return AccumWidth - AccumScale - 1; }
 
   /// getLongAccumScale/IBits - Return the number of fractional/integral bits
   /// in a 'signed long _Accum' type.
   unsigned getLongAccumScale() const { return LongAccumScale; }
   unsigned getLongAccumIBits() const {
     return LongAccumWidth - LongAccumScale - 1;
   }
 
   /// getUnsignedShortAccumScale/IBits - Return the number of
   /// fractional/integral bits in a 'unsigned short _Accum' type.
   unsigned getUnsignedShortAccumScale() const {
     return PaddingOnUnsignedFixedPoint ? ShortAccumScale : ShortAccumScale + 1;
   }
   unsigned getUnsignedShortAccumIBits() const {
     return PaddingOnUnsignedFixedPoint
                ? getShortAccumIBits()
                : ShortAccumWidth - getUnsignedShortAccumScale();
   }
 
   /// getUnsignedAccumScale/IBits - Return the number of fractional/integral
   /// bits in a 'unsigned _Accum' type.
   unsigned getUnsignedAccumScale() const {
     return PaddingOnUnsignedFixedPoint ? AccumScale : AccumScale + 1;
   }
   unsigned getUnsignedAccumIBits() const {
     return PaddingOnUnsignedFixedPoint ? getAccumIBits()
                                        : AccumWidth - getUnsignedAccumScale();
   }
 
   /// getUnsignedLongAccumScale/IBits - Return the number of fractional/integral
   /// bits in a 'unsigned long _Accum' type.
   unsigned getUnsignedLongAccumScale() const {
     return PaddingOnUnsignedFixedPoint ? LongAccumScale : LongAccumScale + 1;
   }
   unsigned getUnsignedLongAccumIBits() const {
     return PaddingOnUnsignedFixedPoint
                ? getLongAccumIBits()
                : LongAccumWidth - getUnsignedLongAccumScale();
   }
 
   /// getShortFractScale - Return the number of fractional bits
   /// in a 'signed short _Fract' type.
   unsigned getShortFractScale() const { return ShortFractWidth - 1; }
 
   /// getFractScale - Return the number of fractional bits
   /// in a 'signed _Fract' type.
   unsigned getFractScale() const { return FractWidth - 1; }
 
   /// getLongFractScale - Return the number of fractional bits
   /// in a 'signed long _Fract' type.
   unsigned getLongFractScale() const { return LongFractWidth - 1; }
 
   /// getUnsignedShortFractScale - Return the number of fractional bits
   /// in a 'unsigned short _Fract' type.
   unsigned getUnsignedShortFractScale() const {
     return PaddingOnUnsignedFixedPoint ? getShortFractScale()
                                        : getShortFractScale() + 1;
   }
 
   /// getUnsignedFractScale - Return the number of fractional bits
   /// in a 'unsigned _Fract' type.
   unsigned getUnsignedFractScale() const {
     return PaddingOnUnsignedFixedPoint ? getFractScale() : getFractScale() + 1;
   }
 
   /// getUnsignedLongFractScale - Return the number of fractional bits
   /// in a 'unsigned long _Fract' type.
   unsigned getUnsignedLongFractScale() const {
     return PaddingOnUnsignedFixedPoint ? getLongFractScale()
                                        : getLongFractScale() + 1;
   }
 
   /// Determine whether the __int128 type is supported on this target.
   virtual bool hasInt128Type() const {
     return (getPointerWidth(LangAS::Default) >= 64) ||
            getTargetOpts().ForceEnableInt128;
   } // FIXME
 
   /// Determine whether the _BitInt type is supported on this target. This
   /// limitation is put into place for ABI reasons.
   /// FIXME: _BitInt is a required type in C23, so there's not much utility in
   /// asking whether the target supported it or not; I think this should be
   /// removed once backends have been alerted to the type and have had the
   /// chance to do implementation work if needed.
   virtual bool hasBitIntType() const {
     return false;
   }
 
   // Different targets may support a different maximum width for the _BitInt
   // type, depending on what operations are supported.
   virtual size_t getMaxBitIntWidth() const {
     // Consider -fexperimental-max-bitint-width= first.
     if (MaxBitIntWidth)
       return std::min<size_t>(*MaxBitIntWidth, llvm::IntegerType::MAX_INT_BITS);
 
     // FIXME: this value should be llvm::IntegerType::MAX_INT_BITS, which is
     // maximum bit width that LLVM claims its IR can support. However, most
     // backends currently have a bug where they only support float to int
     // conversion (and vice versa) on types that are <= 128 bits and crash
     // otherwise. We're setting the max supported value to 128 to be
     // conservative.
     return 128;
   }
 
   /// Determine whether _Float16 is supported on this target.
   virtual bool hasLegalHalfType() const { return HasLegalHalfType; }
 
   /// Whether half args and returns are supported.
   virtual bool allowHalfArgsAndReturns() const { return HalfArgsAndReturns; }
 
   /// Determine whether the __float128 type is supported on this target.
   virtual bool hasFloat128Type() const { return HasFloat128; }
 
   /// Determine whether the _Float16 type is supported on this target.
   virtual bool hasFloat16Type() const { return HasFloat16; }
 
   /// Determine whether the _BFloat16 type is supported on this target.
   virtual bool hasBFloat16Type() const {
     return HasBFloat16 || HasFullBFloat16;
   }
 
   /// Determine whether the BFloat type is fully supported on this target, i.e
   /// arithemtic operations.
   virtual bool hasFullBFloat16Type() const { return HasFullBFloat16; }
 
   /// Determine whether the __ibm128 type is supported on this target.
   virtual bool hasIbm128Type() const { return HasIbm128; }
 
   /// Determine whether the long double type is supported on this target.
   virtual bool hasLongDoubleType() const { return HasLongDouble; }
 
   /// Determine whether return of a floating point value is supported
   /// on this target.
   virtual bool hasFPReturn() const { return HasFPReturn; }
 
   /// Determine whether constrained floating point is supported on this target.
   virtual bool hasStrictFP() const { return HasStrictFP; }
 
   /// Return the alignment that is the largest alignment ever used for any
   /// scalar/SIMD data type on the target machine you are compiling for
   /// (including types with an extended alignment requirement).
   unsigned getSuitableAlign() const { return SuitableAlign; }
 
   /// Return the default alignment for __attribute__((aligned)) on
   /// this target, to be used if no alignment value is specified.
   unsigned getDefaultAlignForAttributeAligned() const {
     return DefaultAlignForAttributeAligned;
   }
 
   /// getMinGlobalAlign - Return the minimum alignment of a global variable,
   /// unless its alignment is explicitly reduced via attributes. If \param
   /// HasNonWeakDef is true, this concerns a VarDecl which has a definition
   /// in current translation unit and that is not weak.
   virtual unsigned getMinGlobalAlign(uint64_t Size, bool HasNonWeakDef) const {
     return MinGlobalAlign;
   }
 
   /// Return the largest alignment for which a suitably-sized allocation with
   /// '::operator new(size_t)' is guaranteed to produce a correctly-aligned
   /// pointer.
   unsigned getNewAlign() const {
     return NewAlign ? NewAlign : std::max(LongDoubleAlign, LongLongAlign);
   }
 
   /// getWCharWidth/Align - Return the size of 'wchar_t' for this target, in
   /// bits.
   unsigned getWCharWidth() const { return getTypeWidth(WCharType); }
   unsigned getWCharAlign() const { return getTypeAlign(WCharType); }
 
   /// getChar16Width/Align - Return the size of 'char16_t' for this target, in
   /// bits.
   unsigned getChar16Width() const { return getTypeWidth(Char16Type); }
   unsigned getChar16Align() const { return getTypeAlign(Char16Type); }
 
   /// getChar32Width/Align - Return the size of 'char32_t' for this target, in
   /// bits.
   unsigned getChar32Width() const { return getTypeWidth(Char32Type); }
   unsigned getChar32Align() const { return getTypeAlign(Char32Type); }
 
   /// getHalfWidth/Align/Format - Return the size/align/format of 'half'.
   unsigned getHalfWidth() const { return HalfWidth; }
   unsigned getHalfAlign() const { return HalfAlign; }
   const llvm::fltSemantics &getHalfFormat() const { return *HalfFormat; }
 
   /// getFloatWidth/Align/Format - Return the size/align/format of 'float'.
   unsigned getFloatWidth() const { return FloatWidth; }
   unsigned getFloatAlign() const { return FloatAlign; }
   const llvm::fltSemantics &getFloatFormat() const { return *FloatFormat; }
 
   /// getBFloat16Width/Align/Format - Return the size/align/format of '__bf16'.
   unsigned getBFloat16Width() const { return BFloat16Width; }
   unsigned getBFloat16Align() const { return BFloat16Align; }
   const llvm::fltSemantics &getBFloat16Format() const { return *BFloat16Format; }
 
   /// getDoubleWidth/Align/Format - Return the size/align/format of 'double'.
   unsigned getDoubleWidth() const { return DoubleWidth; }
   unsigned getDoubleAlign() const { return DoubleAlign; }
   const llvm::fltSemantics &getDoubleFormat() const { return *DoubleFormat; }
 
   /// getLongDoubleWidth/Align/Format - Return the size/align/format of 'long
   /// double'.
   unsigned getLongDoubleWidth() const { return LongDoubleWidth; }
   unsigned getLongDoubleAlign() const { return LongDoubleAlign; }
   const llvm::fltSemantics &getLongDoubleFormat() const {
     return *LongDoubleFormat;
   }
 
   /// getFloat128Width/Align/Format - Return the size/align/format of
   /// '__float128'.
   unsigned getFloat128Width() const { return 128; }
   unsigned getFloat128Align() const { return Float128Align; }
   const llvm::fltSemantics &getFloat128Format() const {
     return *Float128Format;
   }
 
   /// getIbm128Width/Align/Format - Return the size/align/format of
   /// '__ibm128'.
   unsigned getIbm128Width() const { return 128; }
   unsigned getIbm128Align() const { return Ibm128Align; }
   const llvm::fltSemantics &getIbm128Format() const { return *Ibm128Format; }
 
   /// Return the mangled code of long double.
   virtual const char *getLongDoubleMangling() const { return "e"; }
 
   /// Return the mangled code of __float128.
   virtual const char *getFloat128Mangling() const { return "g"; }
 
   /// Return the mangled code of __ibm128.
   virtual const char *getIbm128Mangling() const {
     llvm_unreachable("ibm128 not implemented on this target");
   }
 
   /// Return the mangled code of bfloat.
   virtual const char *getBFloat16Mangling() const { return "DF16b"; }
 
   /// Return the value for the C99 FLT_EVAL_METHOD macro.
   virtual LangOptions::FPEvalMethodKind getFPEvalMethod() const {
     return LangOptions::FPEvalMethodKind::FEM_Source;
   }
 
   virtual bool supportSourceEvalMethod() const { return true; }
 
   // getLargeArrayMinWidth/Align - Return the minimum array size that is
   // 'large' and its alignment.
   unsigned getLargeArrayMinWidth() const { return LargeArrayMinWidth; }
   unsigned getLargeArrayAlign() const { return LargeArrayAlign; }
 
   /// Return the maximum width lock-free atomic operation which will
   /// ever be supported for the given target
   unsigned getMaxAtomicPromoteWidth() const { return MaxAtomicPromoteWidth; }
   /// Return the maximum width lock-free atomic operation which can be
   /// inlined given the supported features of the given target.
   unsigned getMaxAtomicInlineWidth() const { return MaxAtomicInlineWidth; }
   /// Set the maximum inline or promote width lock-free atomic operation
   /// for the given target.
   virtual void setMaxAtomicWidth() {}
   /// Returns true if the given target supports lock-free atomic
   /// operations at the specified width and alignment.
   virtual bool hasBuiltinAtomic(uint64_t AtomicSizeInBits,
                                 uint64_t AlignmentInBits) const {
     return AtomicSizeInBits <= AlignmentInBits &&
            AtomicSizeInBits <= getMaxAtomicInlineWidth() &&
            (AtomicSizeInBits <= getCharWidth() ||
             llvm::isPowerOf2_64(AtomicSizeInBits / getCharWidth()));
   }
 
   /// Return the maximum vector alignment supported for the given target.
   unsigned getMaxVectorAlign() const { return MaxVectorAlign; }
 
   unsigned getMaxOpenCLWorkGroupSize() const { return MaxOpenCLWorkGroupSize; }
 
   /// Return the alignment (in bits) of the thrown exception object. This is
   /// only meaningful for targets that allocate C++ exceptions in a system
   /// runtime, such as those using the Itanium C++ ABI.
   virtual unsigned getExnObjectAlignment() const {
     // Itanium says that an _Unwind_Exception has to be "double-word"
     // aligned (and thus the end of it is also so-aligned), meaning 16
     // bytes.  Of course, that was written for the actual Itanium,
     // which is a 64-bit platform.  Classically, the ABI doesn't really
     // specify the alignment on other platforms, but in practice
     // libUnwind declares the struct with __attribute__((aligned)), so
     // we assume that alignment here.  (It's generally 16 bytes, but
     // some targets overwrite it.)
     return getDefaultAlignForAttributeAligned();
   }
 
   /// Return the size of intmax_t and uintmax_t for this target, in bits.
   unsigned getIntMaxTWidth() const {
     return getTypeWidth(IntMaxType);
   }
 
   // Return the size of unwind_word for this target.
   virtual unsigned getUnwindWordWidth() const {
     return getPointerWidth(LangAS::Default);
   }
 
   /// Return the "preferred" register width on this target.
   virtual unsigned getRegisterWidth() const {
     // Currently we assume the register width on the target matches the pointer
     // width, we can introduce a new variable for this if/when some target wants
     // it.
     return PointerWidth;
   }
 
   /// Return true iff unaligned accesses are a single instruction (rather than
   /// a synthesized sequence).
   bool hasUnalignedAccess() const { return HasUnalignedAccess; }
 
   /// Return true iff unaligned accesses are cheap. This affects placement and
   /// size of bitfield loads/stores. (Not the ABI-mandated placement of
   /// the bitfields themselves.)
   bool hasCheapUnalignedBitFieldAccess() const {
     // Simply forward to the unaligned access getter.
     return hasUnalignedAccess();
   }
 
   /// \brief Returns the default value of the __USER_LABEL_PREFIX__ macro,
   /// which is the prefix given to user symbols by default.
   ///
   /// On most platforms this is "", but it is "_" on some.
   const char *getUserLabelPrefix() const { return UserLabelPrefix; }
 
   /// Returns the name of the mcount instrumentation function.
   const char *getMCountName() const {
     return MCountName;
   }
 
   /// Check if the Objective-C built-in boolean type should be signed
   /// char.
   ///
   /// Otherwise, if this returns false, the normal built-in boolean type
   /// should also be used for Objective-C.
   bool useSignedCharForObjCBool() const {
     return UseSignedCharForObjCBool;
   }
   void noSignedCharForObjCBool() {
     UseSignedCharForObjCBool = false;
   }
 
   /// Check whether the alignment of bit-field types is respected
   /// when laying out structures.
   bool useBitFieldTypeAlignment() const {
     return UseBitFieldTypeAlignment;
   }
 
   /// Check whether zero length bitfields should force alignment of
   /// the next member.
   bool useZeroLengthBitfieldAlignment() const {
     return UseZeroLengthBitfieldAlignment;
   }
 
   /// Check whether zero length bitfield alignment is respected if they are
   /// leading members.
   bool useLeadingZeroLengthBitfield() const {
     return UseLeadingZeroLengthBitfield;
   }
 
   /// Get the fixed alignment value in bits for a member that follows
   /// a zero length bitfield.
   unsigned getZeroLengthBitfieldBoundary() const {
     return ZeroLengthBitfieldBoundary;
   }
 
   /// Get the maximum alignment in bits for a static variable with
   /// aligned attribute.
   unsigned getMaxAlignedAttribute() const { return MaxAlignedAttribute; }
 
   /// Check whether explicit bitfield alignment attributes should be
   //  honored, as in "__attribute__((aligned(2))) int b : 1;".
   bool useExplicitBitFieldAlignment() const {
     return UseExplicitBitFieldAlignment;
   }
 
   /// Check whether this target support '\#pragma options align=mac68k'.
   bool hasAlignMac68kSupport() const {
     return HasAlignMac68kSupport;
   }
 
   /// Return the user string for the specified integer type enum.
   ///
   /// For example, SignedShort -> "short".
   static const char *getTypeName(IntType T);
 
   /// Return the constant suffix for the specified integer type enum.
   ///
   /// For example, SignedLong -> "L".
   const char *getTypeConstantSuffix(IntType T) const;
 
   /// Return the printf format modifier for the specified
   /// integer type enum.
   ///
   /// For example, SignedLong -> "l".
   static const char *getTypeFormatModifier(IntType T);
 
   /// Check whether the given real type should use the "fpret" flavor of
   /// Objective-C message passing on this target.
   bool useObjCFPRetForRealType(FloatModeKind T) const {
     return (int)((FloatModeKind)RealTypeUsesObjCFPRetMask & T);
   }
 
   /// Check whether _Complex long double should use the "fp2ret" flavor
   /// of Objective-C message passing on this target.
   bool useObjCFP2RetForComplexLongDouble() const {
     return ComplexLongDoubleUsesFP2Ret;
   }
 
   /// Check whether llvm intrinsics such as llvm.convert.to.fp16 should be used
   /// to convert to and from __fp16.
   /// FIXME: This function should be removed once all targets stop using the
   /// conversion intrinsics.
   virtual bool useFP16ConversionIntrinsics() const {
     return true;
   }
 
   /// Specify if mangling based on address space map should be used or
   /// not for language specific address spaces
   bool useAddressSpaceMapMangling() const {
     return UseAddrSpaceMapMangling;
   }
 
   ///===---- Other target property query methods --------------------------===//
 
   /// Appends the target-specific \#define values for this
   /// target set to the specified buffer.
   virtual void getTargetDefines(const LangOptions &Opts,
                                 MacroBuilder &Builder) const = 0;
 
   /// Return information about target-specific builtins for
   /// the current primary target, and info about which builtins are non-portable
   /// across the current set of primary and secondary targets.
   virtual ArrayRef<Builtin::Info> getTargetBuiltins() const = 0;
 
   /// Returns target-specific min and max values VScale_Range.
   virtual std::optional<std::pair<unsigned, unsigned>>
   getVScaleRange(const LangOptions &LangOpts,
                  bool IsArmStreamingFunction) const {
     return std::nullopt;
   }
   /// The __builtin_clz* and __builtin_ctz* built-in
   /// functions are specified to have undefined results for zero inputs, but
   /// on targets that support these operations in a way that provides
   /// well-defined results for zero without loss of performance, it is a good
   /// idea to avoid optimizing based on that undef behavior.
   virtual bool isCLZForZeroUndef() const { return true; }
 
   /// Returns the kind of __builtin_va_list type that should be used
   /// with this target.
   virtual BuiltinVaListKind getBuiltinVaListKind() const = 0;
 
   /// Returns whether or not type \c __builtin_ms_va_list type is
   /// available on this target.
   bool hasBuiltinMSVaList() const { return HasBuiltinMSVaList; }
 
   /// Returns whether or not the AArch64 SVE built-in types are
   /// available on this target.
   bool hasAArch64SVETypes() const { return HasAArch64SVETypes; }
 
   /// Returns whether or not the RISC-V V built-in types are
   /// available on this target.
   bool hasRISCVVTypes() const { return HasRISCVVTypes; }
 
   /// Returns whether or not the AMDGPU unsafe floating point atomics are
   /// allowed.
   bool allowAMDGPUUnsafeFPAtomics() const { return AllowAMDGPUUnsafeFPAtomics; }
 
   /// For ARM targets returns a mask defining which coprocessors are configured
   /// as Custom Datapath.
   uint32_t getARMCDECoprocMask() const { return ARMCDECoprocMask; }
 
   /// Returns whether the passed in string is a valid clobber in an
   /// inline asm statement.
   ///
   /// This is used by Sema.
   bool isValidClobber(StringRef Name) const;
 
   /// Returns whether the passed in string is a valid register name
   /// according to GCC.
   ///
   /// This is used by Sema for inline asm statements.
   virtual bool isValidGCCRegisterName(StringRef Name) const;
 
   /// Returns the "normalized" GCC register name.
   ///
   /// ReturnCannonical true will return the register name without any additions
   /// such as "{}" or "%" in it's canonical form, for example:
   /// ReturnCanonical = true and Name = "rax", will return "ax".
   StringRef getNormalizedGCCRegisterName(StringRef Name,
                                          bool ReturnCanonical = false) const;
 
   virtual bool isSPRegName(StringRef) const { return false; }
 
   /// Extracts a register from the passed constraint (if it is a
   /// single-register constraint) and the asm label expression related to a
   /// variable in the input or output list of an inline asm statement.
   ///
   /// This function is used by Sema in order to diagnose conflicts between
   /// the clobber list and the input/output lists.
   virtual StringRef getConstraintRegister(StringRef Constraint,
                                           StringRef Expression) const {
     return "";
   }
 
   struct ConstraintInfo {
     enum {
       CI_None = 0x00,
       CI_AllowsMemory = 0x01,
       CI_AllowsRegister = 0x02,
       CI_ReadWrite = 0x04,         // "+r" output constraint (read and write).
       CI_HasMatchingInput = 0x08,  // This output operand has a matching input.
       CI_ImmediateConstant = 0x10, // This operand must be an immediate constant
       CI_EarlyClobber = 0x20,      // "&" output constraint (early clobber).
     };
     unsigned Flags;
     int TiedOperand;
     struct {
       int Min;
       int Max;
       bool isConstrained;
     } ImmRange;
     llvm::SmallSet<int, 4> ImmSet;
 
     std::string ConstraintStr;  // constraint: "=rm"
     std::string Name;           // Operand name: [foo] with no []'s.
   public:
     ConstraintInfo(StringRef ConstraintStr, StringRef Name)
         : Flags(0), TiedOperand(-1), ConstraintStr(ConstraintStr.str()),
           Name(Name.str()) {
       ImmRange.Min = ImmRange.Max = 0;
       ImmRange.isConstrained = false;
     }
 
     const std::string &getConstraintStr() const { return ConstraintStr; }
     const std::string &getName() const { return Name; }
     bool isReadWrite() const { return (Flags & CI_ReadWrite) != 0; }
     bool earlyClobber() { return (Flags & CI_EarlyClobber) != 0; }
     bool allowsRegister() const { return (Flags & CI_AllowsRegister) != 0; }
     bool allowsMemory() const { return (Flags & CI_AllowsMemory) != 0; }
 
     /// Return true if this output operand has a matching
     /// (tied) input operand.
     bool hasMatchingInput() const { return (Flags & CI_HasMatchingInput) != 0; }
 
     /// Return true if this input operand is a matching
     /// constraint that ties it to an output operand.
     ///
     /// If this returns true then getTiedOperand will indicate which output
     /// operand this is tied to.
     bool hasTiedOperand() const { return TiedOperand != -1; }
     unsigned getTiedOperand() const {
       assert(hasTiedOperand() && "Has no tied operand!");
       return (unsigned)TiedOperand;
     }
 
     bool requiresImmediateConstant() const {
       return (Flags & CI_ImmediateConstant) != 0;
     }
     bool isValidAsmImmediate(const llvm::APInt &Value) const {
       if (!ImmSet.empty())
         return Value.isSignedIntN(32) && ImmSet.contains(Value.getZExtValue());
       return !ImmRange.isConstrained ||
              (Value.sge(ImmRange.Min) && Value.sle(ImmRange.Max));
     }
 
     void setIsReadWrite() { Flags |= CI_ReadWrite; }
     void setEarlyClobber() { Flags |= CI_EarlyClobber; }
     void setAllowsMemory() { Flags |= CI_AllowsMemory; }
     void setAllowsRegister() { Flags |= CI_AllowsRegister; }
     void setHasMatchingInput() { Flags |= CI_HasMatchingInput; }
     void setRequiresImmediate(int Min, int Max) {
       Flags |= CI_ImmediateConstant;
       ImmRange.Min = Min;
       ImmRange.Max = Max;
       ImmRange.isConstrained = true;
     }
     void setRequiresImmediate(llvm::ArrayRef<int> Exacts) {
       Flags |= CI_ImmediateConstant;
       for (int Exact : Exacts)
         ImmSet.insert(Exact);
     }
     void setRequiresImmediate(int Exact) {
       Flags |= CI_ImmediateConstant;
       ImmSet.insert(Exact);
     }
     void setRequiresImmediate() {
       Flags |= CI_ImmediateConstant;
     }
 
     /// Indicate that this is an input operand that is tied to
     /// the specified output operand.
     ///
     /// Copy over the various constraint information from the output.
     void setTiedOperand(unsigned N, ConstraintInfo &Output) {
       Output.setHasMatchingInput();
       Flags = Output.Flags;
       TiedOperand = N;
       // Don't copy Name or constraint string.
     }
   };
 
   /// Validate register name used for global register variables.
   ///
   /// This function returns true if the register passed in RegName can be used
   /// for global register variables on this target. In addition, it returns
   /// true in HasSizeMismatch if the size of the register doesn't match the
   /// variable size passed in RegSize.
   virtual bool validateGlobalRegisterVariable(StringRef RegName,
                                               unsigned RegSize,
                                               bool &HasSizeMismatch) const {
     HasSizeMismatch = false;
     return true;
   }
 
   // validateOutputConstraint, validateInputConstraint - Checks that
   // a constraint is valid and provides information about it.
   // FIXME: These should return a real error instead of just true/false.
   bool validateOutputConstraint(ConstraintInfo &Info) const;
   bool validateInputConstraint(MutableArrayRef<ConstraintInfo> OutputConstraints,
                                ConstraintInfo &info) const;
 
   virtual bool validateOutputSize(const llvm::StringMap<bool> &FeatureMap,
                                   StringRef /*Constraint*/,
                                   unsigned /*Size*/) const {
     return true;
   }
 
   virtual bool validateInputSize(const llvm::StringMap<bool> &FeatureMap,
                                  StringRef /*Constraint*/,
                                  unsigned /*Size*/) const {
     return true;
   }
   virtual bool
   validateConstraintModifier(StringRef /*Constraint*/,
                              char /*Modifier*/,
                              unsigned /*Size*/,
                              std::string &/*SuggestedModifier*/) const {
     return true;
   }
   virtual bool
   validateAsmConstraint(const char *&Name,
                         TargetInfo::ConstraintInfo &info) const = 0;
 
   bool resolveSymbolicName(const char *&Name,
                            ArrayRef<ConstraintInfo> OutputConstraints,
                            unsigned &Index) const;
 
   // Constraint parm will be left pointing at the last character of
   // the constraint.  In practice, it won't be changed unless the
   // constraint is longer than one character.
   virtual std::string convertConstraint(const char *&Constraint) const {
     // 'p' defaults to 'r', but can be overridden by targets.
     if (*Constraint == 'p')
       return std::string("r");
     return std::string(1, *Constraint);
   }
 
   /// Replace some escaped characters with another string based on
   /// target-specific rules
   virtual std::optional<std::string> handleAsmEscapedChar(char C) const {
     return std::nullopt;
   }
 
   /// Returns a string of target-specific clobbers, in LLVM format.
   virtual std::string_view getClobbers() const = 0;
 
   /// Returns true if NaN encoding is IEEE 754-2008.
   /// Only MIPS allows a different encoding.
   virtual bool isNan2008() const {
     return true;
   }
 
   /// Returns the target triple of the primary target.
   const llvm::Triple &getTriple() const {
     return Triple;
   }
 
   /// Returns the target ID if supported.
   virtual std::optional<std::string> getTargetID() const {
     return std::nullopt;
   }
 
   const char *getDataLayoutString() const {
     assert(!DataLayoutString.empty() && "Uninitialized DataLayout!");
     return DataLayoutString.c_str();
   }
 
   struct GCCRegAlias {
     const char * const Aliases[5];
     const char * const Register;
   };
 
   struct AddlRegName {
     const char * const Names[5];
     const unsigned RegNum;
   };
 
   /// Does this target support "protected" visibility?
   ///
   /// Any target which dynamic libraries will naturally support
   /// something like "default" (meaning that the symbol is visible
   /// outside this shared object) and "hidden" (meaning that it isn't)
   /// visibilities, but "protected" is really an ELF-specific concept
   /// with weird semantics designed around the convenience of dynamic
   /// linker implementations.  Which is not to suggest that there's
   /// consistent target-independent semantics for "default" visibility
   /// either; the entire thing is pretty badly mangled.
   virtual bool hasProtectedVisibility() const { return true; }
 
   /// Does this target aim for semantic compatibility with
   /// Microsoft C++ code using dllimport/export attributes?
   virtual bool shouldDLLImportComdatSymbols() const {
     return getTriple().isWindowsMSVCEnvironment() ||
            getTriple().isWindowsItaniumEnvironment() || getTriple().isPS();
   }
 
   // Does this target have PS4 specific dllimport/export handling?
   virtual bool hasPS4DLLImportExport() const {
     return getTriple().isPS() ||
            // Windows Itanium support allows for testing the SCEI flavour of
            // dllimport/export handling on a Windows system.
            (getTriple().isWindowsItaniumEnvironment() &&
             getTriple().getVendor() == llvm::Triple::SCEI);
   }
 
   /// Set forced language options.
   ///
   /// Apply changes to the target information with respect to certain
   /// language options which change the target configuration and adjust
   /// the language based on the target options where applicable.
   virtual void adjust(DiagnosticsEngine &Diags, LangOptions &Opts);
 
   /// Initialize the map with the default set of target features for the
   /// CPU this should include all legal feature strings on the target.
   ///
   /// \return False on error (invalid features).
   virtual bool initFeatureMap(llvm::StringMap<bool> &Features,
                               DiagnosticsEngine &Diags, StringRef CPU,
                               const std::vector<std::string> &FeatureVec) const;
 
   /// Get the ABI currently in use.
   virtual StringRef getABI() const { return StringRef(); }
 
   /// Get the C++ ABI currently in use.
   TargetCXXABI getCXXABI() const {
     return TheCXXABI;
   }
 
   /// Target the specified CPU.
   ///
   /// \return  False on error (invalid CPU name).
   virtual bool setCPU(const std::string &Name) {
     return false;
   }
 
   /// Fill a SmallVectorImpl with the valid values to setCPU.
   virtual void fillValidCPUList(SmallVectorImpl<StringRef> &Values) const {}
 
   /// Fill a SmallVectorImpl with the valid values for tuning CPU.
   virtual void fillValidTuneCPUList(SmallVectorImpl<StringRef> &Values) const {
     fillValidCPUList(Values);
   }
 
   /// Determine whether this TargetInfo supports the given CPU name.
   virtual bool isValidCPUName(StringRef Name) const {
     return true;
   }
 
   /// Determine whether this TargetInfo supports the given CPU name for
   /// tuning.
   virtual bool isValidTuneCPUName(StringRef Name) const {
     return isValidCPUName(Name);
   }
 
   virtual ParsedTargetAttr parseTargetAttr(StringRef Str) const;
 
   /// Determine whether this TargetInfo supports tune in target attribute.
   virtual bool supportsTargetAttributeTune() const {
     return false;
   }
 
   /// Use the specified ABI.
   ///
   /// \return False on error (invalid ABI name).
   virtual bool setABI(const std::string &Name) {
     return false;
   }
 
   /// Use the specified unit for FP math.
   ///
   /// \return False on error (invalid unit name).
   virtual bool setFPMath(StringRef Name) {
     return false;
   }
 
   /// Check if target has a given feature enabled
   virtual bool hasFeatureEnabled(const llvm::StringMap<bool> &Features,
                                  StringRef Name) const {
     return Features.lookup(Name);
   }
 
   /// Enable or disable a specific target feature;
   /// the feature name must be valid.
   virtual void setFeatureEnabled(llvm::StringMap<bool> &Features,
                                  StringRef Name,
                                  bool Enabled) const {
     Features[Name] = Enabled;
   }
 
   /// Determine whether this TargetInfo supports the given feature.
   virtual bool isValidFeatureName(StringRef Feature) const {
     return true;
   }
 
   /// Returns true if feature has an impact on target code
   /// generation.
   virtual bool doesFeatureAffectCodeGen(StringRef Feature) const {
     return true;
   }
 
   class BranchProtectionInfo {
   public:
     LangOptions::SignReturnAddressScopeKind SignReturnAddr;
     LangOptions::SignReturnAddressKeyKind SignKey;
     bool BranchTargetEnforcement;
     bool BranchProtectionPAuthLR;
     bool GuardedControlStack;
 
     const char *getSignReturnAddrStr() const {
       switch (SignReturnAddr) {
       case LangOptions::SignReturnAddressScopeKind::None:
         return "none";
       case LangOptions::SignReturnAddressScopeKind::NonLeaf:
         return "non-leaf";
       case LangOptions::SignReturnAddressScopeKind::All:
         return "all";
       }
       llvm_unreachable("Unexpected SignReturnAddressScopeKind");
     }
 
     const char *getSignKeyStr() const {
       switch (SignKey) {
       case LangOptions::SignReturnAddressKeyKind::AKey:
         return "a_key";
       case LangOptions::SignReturnAddressKeyKind::BKey:
         return "b_key";
       }
       llvm_unreachable("Unexpected SignReturnAddressKeyKind");
     }
 
     BranchProtectionInfo()
         : SignReturnAddr(LangOptions::SignReturnAddressScopeKind::None),
           SignKey(LangOptions::SignReturnAddressKeyKind::AKey),
           BranchTargetEnforcement(false), BranchProtectionPAuthLR(false),
           GuardedControlStack(false) {}
 
     BranchProtectionInfo(const LangOptions &LangOpts) {
       SignReturnAddr =
           LangOpts.hasSignReturnAddress()
               ? (LangOpts.isSignReturnAddressScopeAll()
                      ? LangOptions::SignReturnAddressScopeKind::All
                      : LangOptions::SignReturnAddressScopeKind::NonLeaf)
               : LangOptions::SignReturnAddressScopeKind::None;
       SignKey = LangOpts.isSignReturnAddressWithAKey()
                     ? LangOptions::SignReturnAddressKeyKind::AKey
                     : LangOptions::SignReturnAddressKeyKind::BKey;
       BranchTargetEnforcement = LangOpts.BranchTargetEnforcement;
       BranchProtectionPAuthLR = LangOpts.BranchProtectionPAuthLR;
       GuardedControlStack = LangOpts.GuardedControlStack;
     }
   };
 
   /// Determine if the Architecture in this TargetInfo supports branch
   /// protection
   virtual bool isBranchProtectionSupportedArch(StringRef Arch) const {
     return false;
   }
 
   /// Determine if this TargetInfo supports the given branch protection
   /// specification
   virtual bool validateBranchProtection(StringRef Spec, StringRef Arch,
                                         BranchProtectionInfo &BPI,
                                         const LangOptions &LO,
                                         StringRef &Err) const {
     Err = "";
     return false;
   }
 
   /// Perform initialization based on the user configured
   /// set of features (e.g., +sse4).
   ///
   /// The list is guaranteed to have at most one entry per feature.
   ///
   /// The target may modify the features list, to change which options are
   /// passed onwards to the backend.
   /// FIXME: This part should be fixed so that we can change handleTargetFeatures
   /// to merely a TargetInfo initialization routine.
   ///
   /// \return  False on error.
   virtual bool handleTargetFeatures(std::vector<std::string> &Features,
                                     DiagnosticsEngine &Diags) {
     return true;
   }
 
   /// Determine whether the given target has the given feature.
   virtual bool hasFeature(StringRef Feature) const {
     return false;
   }
 
   /// Determine whether the given target feature is read only.
   bool isReadOnlyFeature(StringRef Feature) const {
     return ReadOnlyFeatures.count(Feature);
   }
 
   /// Identify whether this target supports multiversioning of functions,
   /// which requires support for cpu_supports and cpu_is functionality.
   bool supportsMultiVersioning() const {
     return getTriple().isX86() || getTriple().isAArch64() ||
            getTriple().isRISCV();
   }
 
   /// Identify whether this target supports IFuncs.
   bool supportsIFunc() const {
     if (getTriple().isOSBinFormatMachO())
       return true;
     if (getTriple().isOSWindows() && getTriple().isAArch64())
       return true;
     if (getTriple().getArch() == llvm::Triple::ArchType::avr)
       return true;
     return getTriple().isOSBinFormatELF() &&
            ((getTriple().isOSLinux() && !getTriple().isMusl()) ||
             getTriple().isOSFreeBSD());
   }
 
   // Identify whether this target supports __builtin_cpu_supports and
   // __builtin_cpu_is.
   virtual bool supportsCpuSupports() const { return false; }
   virtual bool supportsCpuIs() const { return false; }
   virtual bool supportsCpuInit() const { return false; }
 
   // Validate the contents of the __builtin_cpu_supports(const char*)
   // argument.
   virtual bool validateCpuSupports(StringRef Name) const { return false; }
 
   // Return the target-specific priority for features/cpus/vendors so
   // that they can be properly sorted for checking.
   virtual uint64_t getFMVPriority(ArrayRef<StringRef> Features) const {
     return 0;
   }
 
   // Validate the contents of the __builtin_cpu_is(const char*)
   // argument.
   virtual bool validateCpuIs(StringRef Name) const { return false; }
 
   // Validate a cpu_dispatch/cpu_specific CPU option, which is a different list
   // from cpu_is, since it checks via features rather than CPUs directly.
   virtual bool validateCPUSpecificCPUDispatch(StringRef Name) const {
     return false;
   }
 
   // Get the character to be added for mangling purposes for cpu_specific.
   virtual char CPUSpecificManglingCharacter(StringRef Name) const {
     llvm_unreachable(
         "cpu_specific Multiversioning not implemented on this target");
   }
 
   // Get the value for the 'tune-cpu' flag for a cpu_specific variant with the
   // programmer-specified 'Name'.
   virtual StringRef getCPUSpecificTuneName(StringRef Name) const {
     llvm_unreachable(
         "cpu_specific Multiversioning not implemented on this target");
   }
 
   // Get a list of the features that make up the CPU option for
   // cpu_specific/cpu_dispatch so that it can be passed to llvm as optimization
   // options.
   virtual void getCPUSpecificCPUDispatchFeatures(
       StringRef Name, llvm::SmallVectorImpl<StringRef> &Features) const {
     llvm_unreachable(
         "cpu_specific Multiversioning not implemented on this target");
   }
 
   // Get the cache line size of a given cpu. This method switches over
   // the given cpu and returns "std::nullopt" if the CPU is not found.
   virtual std::optional<unsigned> getCPUCacheLineSize() const {
     return std::nullopt;
   }
 
   // Returns maximal number of args passed in registers.
   unsigned getRegParmMax() const {
     assert(RegParmMax < 7 && "RegParmMax value is larger than AST can handle");
     return RegParmMax;
   }
 
   /// Whether the target supports thread-local storage.
   bool isTLSSupported() const {
     return TLSSupported;
   }
 
   /// Return the maximum alignment (in bits) of a TLS variable
   ///
   /// Gets the maximum alignment (in bits) of a TLS variable on this target.
   /// Returns zero if there is no such constraint.
   unsigned getMaxTLSAlign() const { return MaxTLSAlign; }
 
   /// Whether target supports variable-length arrays.
   bool isVLASupported() const { return VLASupported; }
 
   /// Whether the target supports SEH __try.
   bool isSEHTrySupported() const {
     return getTriple().isOSWindows() &&
            (getTriple().isX86() ||
             getTriple().getArch() == llvm::Triple::aarch64);
   }
 
   /// Return true if {|} are normal characters in the asm string.
   ///
   /// If this returns false (the default), then {abc|xyz} is syntax
   /// that says that when compiling for asm variant #0, "abc" should be
   /// generated, but when compiling for asm variant #1, "xyz" should be
   /// generated.
   bool hasNoAsmVariants() const {
     return NoAsmVariants;
   }
 
   /// Return the register number that __builtin_eh_return_regno would
   /// return with the specified argument.
   /// This corresponds with TargetLowering's getExceptionPointerRegister
   /// and getExceptionSelectorRegister in the backend.
   virtual int getEHDataRegisterNumber(unsigned RegNo) const {
     return -1;
   }
 
   /// Return the section to use for C++ static initialization functions.
   virtual const char *getStaticInitSectionSpecifier() const {
     return nullptr;
   }
 
   const LangASMap &getAddressSpaceMap() const { return *AddrSpaceMap; }
   unsigned getTargetAddressSpace(LangAS AS) const {
     if (isTargetAddressSpace(AS))
       return toTargetAddressSpace(AS);
     return getAddressSpaceMap()[(unsigned)AS];
   }
 
   /// Determine whether the given pointer-authentication key is valid.
   ///
   /// The value has been coerced to type 'int'.
   virtual bool validatePointerAuthKey(const llvm::APSInt &value) const;
 
   /// Map from the address space field in builtin description strings to the
   /// language address space.
   virtual LangAS getOpenCLBuiltinAddressSpace(unsigned AS) const {
     return getLangASFromTargetAS(AS);
   }
 
   /// Map from the address space field in builtin description strings to the
   /// language address space.
   virtual LangAS getCUDABuiltinAddressSpace(unsigned AS) const {
     return getLangASFromTargetAS(AS);
   }
 
   /// Return an AST address space which can be used opportunistically
   /// for constant global memory. It must be possible to convert pointers into
   /// this address space to LangAS::Default. If no such address space exists,
   /// this may return std::nullopt, and such optimizations will be disabled.
   virtual std::optional<LangAS> getConstantAddressSpace() const {
     return LangAS::Default;
   }
 
   // access target-specific GPU grid values that must be consistent between
   // host RTL (plugin), deviceRTL and clang.
   virtual const llvm::omp::GV &getGridValue() const {
     llvm_unreachable("getGridValue not implemented on this target");
   }
 
   /// Retrieve the name of the platform as it is used in the
   /// availability attribute.
   StringRef getPlatformName() const { return PlatformName; }
 
   /// Retrieve the minimum desired version of the platform, to
   /// which the program should be compiled.
   VersionTuple getPlatformMinVersion() const { return PlatformMinVersion; }
 
   bool isBigEndian() const { return BigEndian; }
   bool isLittleEndian() const { return !BigEndian; }
 
   /// Whether the option -fextend-arguments={32,64} is supported on the target.
   virtual bool supportsExtendIntArgs() const { return false; }
 
   /// Controls if __arithmetic_fence is supported in the targeted backend.
   virtual bool checkArithmeticFenceSupported() const { return false; }
 
   /// Gets the default calling convention for the given target and
   /// declaration context.
   virtual CallingConv getDefaultCallingConv() const {
     // Not all targets will specify an explicit calling convention that we can
     // express.  This will always do the right thing, even though it's not
     // an explicit calling convention.
     return CC_C;
   }
 
   enum CallingConvCheckResult {
     CCCR_OK,
     CCCR_Warning,
     CCCR_Ignore,
     CCCR_Error,
   };
 
   /// Determines whether a given calling convention is valid for the
   /// target. A calling convention can either be accepted, produce a warning
   /// and be substituted with the default calling convention, or (someday)
   /// produce an error (such as using thiscall on a non-instance function).
   virtual CallingConvCheckResult checkCallingConvention(CallingConv CC) const {
     switch (CC) {
       default:
         return CCCR_Warning;
       case CC_C:
         return CCCR_OK;
     }
   }
 
   enum CallingConvKind {
     CCK_Default,
     CCK_ClangABI4OrPS4,
     CCK_MicrosoftWin64
   };
 
   virtual CallingConvKind getCallingConvKind(bool ClangABICompat4) const;
 
   /// Controls whether explicitly defaulted (`= default`) special member
   /// functions disqualify something from being POD-for-the-purposes-of-layout.
   /// Historically, Clang didn't consider these acceptable for POD, but GCC
   /// does. So in newer Clang ABIs they are acceptable for POD to be compatible
   /// with GCC/Itanium ABI, and remains disqualifying for targets that need
   /// Clang backwards compatibility rather than GCC/Itanium ABI compatibility.
   virtual bool areDefaultedSMFStillPOD(const LangOptions&) const;
 
   /// Controls if __builtin_longjmp / __builtin_setjmp can be lowered to
   /// llvm.eh.sjlj.longjmp / llvm.eh.sjlj.setjmp.
   virtual bool hasSjLjLowering() const {
     return false;
   }
 
   /// Check if the target supports CFProtection branch.
   virtual bool
   checkCFProtectionBranchSupported(DiagnosticsEngine &Diags) const;
 
   /// Get the target default CFBranchLabelScheme scheme
   virtual CFBranchLabelSchemeKind getDefaultCFBranchLabelScheme() const;
 
   virtual bool
   checkCFBranchLabelSchemeSupported(const CFBranchLabelSchemeKind Scheme,
                                     DiagnosticsEngine &Diags) const;
 
   /// Check if the target supports CFProtection return.
   virtual bool
   checkCFProtectionReturnSupported(DiagnosticsEngine &Diags) const;
 
   /// Whether target allows to overalign ABI-specified preferred alignment
   virtual bool allowsLargerPreferedTypeAlignment() const { return true; }
 
   /// Whether target defaults to the `power` alignment rules of AIX.
   virtual bool defaultsToAIXPowerAlignment() const { return false; }
 
   /// Set supported OpenCL extensions and optional core features.
   virtual void setSupportedOpenCLOpts() {}
 
   virtual void supportAllOpenCLOpts(bool V = true) {
 #define OPENCLEXTNAME(Ext)                                                     \
   setFeatureEnabled(getTargetOpts().OpenCLFeaturesMap, #Ext, V);
 #include "clang/Basic/OpenCLExtensions.def"
   }
 
   /// Set supported OpenCL extensions as written on command line
   virtual void setCommandLineOpenCLOpts() {
     for (const auto &Ext : getTargetOpts().OpenCLExtensionsAsWritten) {
       bool IsPrefixed = (Ext[0] == '+' || Ext[0] == '-');
       std::string Name = IsPrefixed ? Ext.substr(1) : Ext;
       bool V = IsPrefixed ? Ext[0] == '+' : true;
 
       if (Name == "all") {
         supportAllOpenCLOpts(V);
         continue;
       }
 
       getTargetOpts().OpenCLFeaturesMap[Name] = V;
     }
   }
 
   /// Get supported OpenCL extensions and optional core features.
   llvm::StringMap<bool> &getSupportedOpenCLOpts() {
     return getTargetOpts().OpenCLFeaturesMap;
   }
 
   /// Get const supported OpenCL extensions and optional core features.
   const llvm::StringMap<bool> &getSupportedOpenCLOpts() const {
     return getTargetOpts().OpenCLFeaturesMap;
   }
 
   /// Get address space for OpenCL type.
   virtual LangAS getOpenCLTypeAddrSpace(OpenCLTypeKind TK) const;
 
   /// \returns Target specific vtbl ptr address space.
   virtual unsigned getVtblPtrAddressSpace() const {
     return 0;
   }
 
   /// \returns If a target requires an address within a target specific address
   /// space \p AddressSpace to be converted in order to be used, then return the
   /// corresponding target specific DWARF address space.
   ///
   /// \returns Otherwise return std::nullopt and no conversion will be emitted
   /// in the DWARF.
   virtual std::optional<unsigned> getDWARFAddressSpace(unsigned AddressSpace)
       const {
     return std::nullopt;
   }
 
   /// \returns The version of the SDK which was used during the compilation if
   /// one was specified, or an empty version otherwise.
   const llvm::VersionTuple &getSDKVersion() const {
     return getTargetOpts().SDKVersion;
   }
 
   /// Check the target is valid after it is fully initialized.
   virtual bool validateTarget(DiagnosticsEngine &Diags) const {
     return true;
   }
 
   /// Check that OpenCL target has valid options setting based on OpenCL
   /// version.
   virtual bool validateOpenCLTarget(const LangOptions &Opts,
                                     DiagnosticsEngine &Diags) const;
 
   virtual void setAuxTarget(const TargetInfo *Aux) {}
 
   /// Whether target allows debuginfo types for decl only variables/functions.
   virtual bool allowDebugInfoForExternalRef() const { return false; }
 
   /// Returns the darwin target variant triple, the variant of the deployment
   /// target for which the code is being compiled.
   const llvm::Triple *getDarwinTargetVariantTriple() const {
     return DarwinTargetVariantTriple ? &*DarwinTargetVariantTriple : nullptr;
   }
 
   /// Returns the version of the darwin target variant SDK which was used during
   /// the compilation if one was specified, or an empty version otherwise.
   const std::optional<VersionTuple> getDarwinTargetVariantSDKVersion() const {
     return !getTargetOpts().DarwinTargetVariantSDKVersion.empty()
                ? getTargetOpts().DarwinTargetVariantSDKVersion
                : std::optional<VersionTuple>();
   }
 
   /// Whether to support HIP image/texture API's.
   virtual bool hasHIPImageSupport() const { return true; }
 
   /// The first value in the pair is the minimum offset between two objects to
   /// avoid false sharing (destructive interference). The second value in the
   /// pair is maximum size of contiguous memory to promote true sharing
   /// (constructive interference). Neither of these values are considered part
   /// of the ABI and can be changed by targets at any time.
   virtual std::pair<unsigned, unsigned> hardwareInterferenceSizes() const {
     return std::make_pair(64, 64);
   }
 
 protected:
   /// Copy type and layout related info.
   void copyAuxTarget(const TargetInfo *Aux);
   virtual uint64_t getPointerWidthV(LangAS AddrSpace) const {
     return PointerWidth;
   }
   virtual uint64_t getPointerAlignV(LangAS AddrSpace) const {
     return PointerAlign;
   }
   virtual enum IntType getPtrDiffTypeV(LangAS AddrSpace) const {
     return PtrDiffType;
   }
   virtual ArrayRef<const char *> getGCCRegNames() const = 0;
   virtual ArrayRef<GCCRegAlias> getGCCRegAliases() const = 0;
   virtual ArrayRef<AddlRegName> getGCCAddlRegNames() const { return {}; }
 
 private:
   // Assert the values for the fractional and integral bits for each fixed point
   // type follow the restrictions given in clause 6.2.6.3 of N1169.
   void CheckFixedPointBits() const;
 };
 
 namespace targets {
 std::unique_ptr<clang::TargetInfo>
 AllocateTarget(const llvm::Triple &Triple, const clang::TargetOptions &Opts);
 } // namespace targets
 
 }  // end namespace clang
 
 #endif

This page was automatically generated by the 2.3.7 LXR engine. The LXR team