929 lines
33 KiB
C++
929 lines
33 KiB
C++
//===--- TargetInfo.h - Expose information about the target -----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// \brief Defines the clang::TargetInfo interface.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_BASIC_TARGETINFO_H
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#define LLVM_CLANG_BASIC_TARGETINFO_H
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#include "clang/Basic/AddressSpaces.h"
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#include "clang/Basic/LLVM.h"
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#include "clang/Basic/Specifiers.h"
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#include "clang/Basic/TargetCXXABI.h"
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#include "clang/Basic/TargetOptions.h"
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#include "clang/Basic/VersionTuple.h"
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#include "llvm/ADT/IntrusiveRefCntPtr.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/StringSwitch.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/Support/DataTypes.h"
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#include <cassert>
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#include <string>
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#include <vector>
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namespace llvm {
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struct fltSemantics;
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}
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namespace clang {
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class DiagnosticsEngine;
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class LangOptions;
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class MacroBuilder;
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class SourceLocation;
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class SourceManager;
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namespace Builtin { struct Info; }
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/// \brief Exposes information about the current target.
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///
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class TargetInfo : public RefCountedBase<TargetInfo> {
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std::shared_ptr<TargetOptions> TargetOpts;
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llvm::Triple Triple;
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protected:
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// Target values set by the ctor of the actual target implementation. Default
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// values are specified by the TargetInfo constructor.
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bool BigEndian;
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bool TLSSupported;
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bool NoAsmVariants; // True if {|} are normal characters.
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unsigned char PointerWidth, PointerAlign;
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unsigned char BoolWidth, BoolAlign;
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unsigned char IntWidth, IntAlign;
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unsigned char HalfWidth, HalfAlign;
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unsigned char FloatWidth, FloatAlign;
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unsigned char DoubleWidth, DoubleAlign;
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unsigned char LongDoubleWidth, LongDoubleAlign;
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unsigned char LargeArrayMinWidth, LargeArrayAlign;
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unsigned char LongWidth, LongAlign;
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unsigned char LongLongWidth, LongLongAlign;
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unsigned char SuitableAlign;
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unsigned char DefaultAlignForAttributeAligned;
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unsigned char MinGlobalAlign;
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unsigned char MaxAtomicPromoteWidth, MaxAtomicInlineWidth;
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unsigned short MaxVectorAlign;
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unsigned short MaxTLSAlign;
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unsigned short SimdDefaultAlign;
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const char *DescriptionString;
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const char *UserLabelPrefix;
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const char *MCountName;
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const llvm::fltSemantics *HalfFormat, *FloatFormat, *DoubleFormat,
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*LongDoubleFormat;
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unsigned char RegParmMax, SSERegParmMax;
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TargetCXXABI TheCXXABI;
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const LangAS::Map *AddrSpaceMap;
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mutable StringRef PlatformName;
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mutable VersionTuple PlatformMinVersion;
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unsigned HasAlignMac68kSupport : 1;
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unsigned RealTypeUsesObjCFPRet : 3;
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unsigned ComplexLongDoubleUsesFP2Ret : 1;
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// TargetInfo Constructor. Default initializes all fields.
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TargetInfo(const llvm::Triple &T);
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public:
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/// \brief Construct a target for the given options.
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///
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/// \param Opts - The options to use to initialize the target. The target may
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/// modify the options to canonicalize the target feature information to match
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/// what the backend expects.
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static TargetInfo *
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CreateTargetInfo(DiagnosticsEngine &Diags,
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const std::shared_ptr<TargetOptions> &Opts);
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virtual ~TargetInfo();
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/// \brief Retrieve the target options.
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TargetOptions &getTargetOpts() const {
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assert(TargetOpts && "Missing target options");
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return *TargetOpts;
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}
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///===---- Target Data Type Query Methods -------------------------------===//
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enum IntType {
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NoInt = 0,
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SignedChar,
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UnsignedChar,
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SignedShort,
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UnsignedShort,
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SignedInt,
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UnsignedInt,
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SignedLong,
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UnsignedLong,
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SignedLongLong,
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UnsignedLongLong
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};
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enum RealType {
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NoFloat = 255,
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Float = 0,
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Double,
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LongDouble
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};
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/// \brief The different kinds of __builtin_va_list types defined by
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/// the target implementation.
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enum BuiltinVaListKind {
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/// typedef char* __builtin_va_list;
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CharPtrBuiltinVaList = 0,
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/// typedef void* __builtin_va_list;
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VoidPtrBuiltinVaList,
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/// __builtin_va_list as defind by the AArch64 ABI
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/// http://infocenter.arm.com/help/topic/com.arm.doc.ihi0055a/IHI0055A_aapcs64.pdf
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AArch64ABIBuiltinVaList,
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/// __builtin_va_list as defined by the PNaCl ABI:
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/// http://www.chromium.org/nativeclient/pnacl/bitcode-abi#TOC-Machine-Types
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PNaClABIBuiltinVaList,
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/// __builtin_va_list as defined by the Power ABI:
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/// https://www.power.org
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/// /resources/downloads/Power-Arch-32-bit-ABI-supp-1.0-Embedded.pdf
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PowerABIBuiltinVaList,
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/// __builtin_va_list as defined by the x86-64 ABI:
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/// http://www.x86-64.org/documentation/abi.pdf
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X86_64ABIBuiltinVaList,
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/// __builtin_va_list as defined by ARM AAPCS ABI
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/// http://infocenter.arm.com
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// /help/topic/com.arm.doc.ihi0042d/IHI0042D_aapcs.pdf
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AAPCSABIBuiltinVaList,
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// typedef struct __va_list_tag
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// {
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// long __gpr;
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// long __fpr;
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// void *__overflow_arg_area;
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// void *__reg_save_area;
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// } va_list[1];
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SystemZBuiltinVaList
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};
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protected:
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IntType SizeType, IntMaxType, PtrDiffType, IntPtrType, WCharType,
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WIntType, Char16Type, Char32Type, Int64Type, SigAtomicType,
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ProcessIDType;
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/// \brief Whether Objective-C's built-in boolean type should be signed char.
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///
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/// Otherwise, when this flag is not set, the normal built-in boolean type is
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/// used.
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unsigned UseSignedCharForObjCBool : 1;
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/// Control whether the alignment of bit-field types is respected when laying
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/// out structures. If true, then the alignment of the bit-field type will be
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/// used to (a) impact the alignment of the containing structure, and (b)
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/// ensure that the individual bit-field will not straddle an alignment
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/// boundary.
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unsigned UseBitFieldTypeAlignment : 1;
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/// \brief Whether zero length bitfields (e.g., int : 0;) force alignment of
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/// the next bitfield.
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///
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/// If the alignment of the zero length bitfield is greater than the member
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/// that follows it, `bar', `bar' will be aligned as the type of the
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/// zero-length bitfield.
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unsigned UseZeroLengthBitfieldAlignment : 1;
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/// If non-zero, specifies a fixed alignment value for bitfields that follow
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/// zero length bitfield, regardless of the zero length bitfield type.
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unsigned ZeroLengthBitfieldBoundary;
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/// \brief Specify if mangling based on address space map should be used or
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/// not for language specific address spaces
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bool UseAddrSpaceMapMangling;
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public:
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IntType getSizeType() const { return SizeType; }
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IntType getIntMaxType() const { return IntMaxType; }
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IntType getUIntMaxType() const {
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return getCorrespondingUnsignedType(IntMaxType);
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}
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IntType getPtrDiffType(unsigned AddrSpace) const {
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return AddrSpace == 0 ? PtrDiffType : getPtrDiffTypeV(AddrSpace);
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}
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IntType getIntPtrType() const { return IntPtrType; }
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IntType getUIntPtrType() const {
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return getCorrespondingUnsignedType(IntPtrType);
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}
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IntType getWCharType() const { return WCharType; }
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IntType getWIntType() const { return WIntType; }
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IntType getChar16Type() const { return Char16Type; }
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IntType getChar32Type() const { return Char32Type; }
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IntType getInt64Type() const { return Int64Type; }
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IntType getUInt64Type() const {
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return getCorrespondingUnsignedType(Int64Type);
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}
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IntType getSigAtomicType() const { return SigAtomicType; }
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IntType getProcessIDType() const { return ProcessIDType; }
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static IntType getCorrespondingUnsignedType(IntType T) {
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switch (T) {
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case SignedChar:
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return UnsignedChar;
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case SignedShort:
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return UnsignedShort;
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case SignedInt:
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return UnsignedInt;
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case SignedLong:
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return UnsignedLong;
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case SignedLongLong:
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return UnsignedLongLong;
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default:
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llvm_unreachable("Unexpected signed integer type");
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}
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}
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/// \brief Return the width (in bits) of the specified integer type enum.
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///
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/// For example, SignedInt -> getIntWidth().
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unsigned getTypeWidth(IntType T) const;
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/// \brief Return integer type with specified width.
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IntType getIntTypeByWidth(unsigned BitWidth, bool IsSigned) const;
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/// \brief Return the smallest integer type with at least the specified width.
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IntType getLeastIntTypeByWidth(unsigned BitWidth, bool IsSigned) const;
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/// \brief Return floating point type with specified width.
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RealType getRealTypeByWidth(unsigned BitWidth) const;
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/// \brief Return the alignment (in bits) of the specified integer type enum.
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///
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/// For example, SignedInt -> getIntAlign().
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unsigned getTypeAlign(IntType T) const;
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/// \brief Returns true if the type is signed; false otherwise.
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static bool isTypeSigned(IntType T);
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/// \brief Return the width of pointers on this target, for the
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/// specified address space.
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uint64_t getPointerWidth(unsigned AddrSpace) const {
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return AddrSpace == 0 ? PointerWidth : getPointerWidthV(AddrSpace);
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}
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uint64_t getPointerAlign(unsigned AddrSpace) const {
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return AddrSpace == 0 ? PointerAlign : getPointerAlignV(AddrSpace);
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}
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/// \brief Return the size of '_Bool' and C++ 'bool' for this target, in bits.
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unsigned getBoolWidth() const { return BoolWidth; }
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/// \brief Return the alignment of '_Bool' and C++ 'bool' for this target.
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unsigned getBoolAlign() const { return BoolAlign; }
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unsigned getCharWidth() const { return 8; } // FIXME
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unsigned getCharAlign() const { return 8; } // FIXME
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/// \brief Return the size of 'signed short' and 'unsigned short' for this
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/// target, in bits.
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unsigned getShortWidth() const { return 16; } // FIXME
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/// \brief Return the alignment of 'signed short' and 'unsigned short' for
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/// this target.
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unsigned getShortAlign() const { return 16; } // FIXME
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/// getIntWidth/Align - Return the size of 'signed int' and 'unsigned int' for
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/// this target, in bits.
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unsigned getIntWidth() const { return IntWidth; }
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unsigned getIntAlign() const { return IntAlign; }
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/// getLongWidth/Align - Return the size of 'signed long' and 'unsigned long'
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/// for this target, in bits.
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unsigned getLongWidth() const { return LongWidth; }
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unsigned getLongAlign() const { return LongAlign; }
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/// getLongLongWidth/Align - Return the size of 'signed long long' and
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/// 'unsigned long long' for this target, in bits.
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unsigned getLongLongWidth() const { return LongLongWidth; }
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unsigned getLongLongAlign() const { return LongLongAlign; }
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/// \brief Determine whether the __int128 type is supported on this target.
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virtual bool hasInt128Type() const { return getPointerWidth(0) >= 64; } // FIXME
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/// \brief Return the alignment that is suitable for storing any
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/// object with a fundamental alignment requirement.
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unsigned getSuitableAlign() const { return SuitableAlign; }
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/// \brief Return the default alignment for __attribute__((aligned)) on
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/// this target, to be used if no alignment value is specified.
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unsigned getDefaultAlignForAttributeAligned() const {
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return DefaultAlignForAttributeAligned;
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}
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/// getMinGlobalAlign - Return the minimum alignment of a global variable,
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/// unless its alignment is explicitly reduced via attributes.
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unsigned getMinGlobalAlign() const { return MinGlobalAlign; }
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/// getWCharWidth/Align - Return the size of 'wchar_t' for this target, in
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/// bits.
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unsigned getWCharWidth() const { return getTypeWidth(WCharType); }
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unsigned getWCharAlign() const { return getTypeAlign(WCharType); }
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/// getChar16Width/Align - Return the size of 'char16_t' for this target, in
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/// bits.
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unsigned getChar16Width() const { return getTypeWidth(Char16Type); }
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unsigned getChar16Align() const { return getTypeAlign(Char16Type); }
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/// getChar32Width/Align - Return the size of 'char32_t' for this target, in
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/// bits.
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unsigned getChar32Width() const { return getTypeWidth(Char32Type); }
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unsigned getChar32Align() const { return getTypeAlign(Char32Type); }
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/// getHalfWidth/Align/Format - Return the size/align/format of 'half'.
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unsigned getHalfWidth() const { return HalfWidth; }
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unsigned getHalfAlign() const { return HalfAlign; }
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const llvm::fltSemantics &getHalfFormat() const { return *HalfFormat; }
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/// getFloatWidth/Align/Format - Return the size/align/format of 'float'.
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unsigned getFloatWidth() const { return FloatWidth; }
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unsigned getFloatAlign() const { return FloatAlign; }
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const llvm::fltSemantics &getFloatFormat() const { return *FloatFormat; }
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/// getDoubleWidth/Align/Format - Return the size/align/format of 'double'.
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unsigned getDoubleWidth() const { return DoubleWidth; }
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unsigned getDoubleAlign() const { return DoubleAlign; }
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const llvm::fltSemantics &getDoubleFormat() const { return *DoubleFormat; }
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/// getLongDoubleWidth/Align/Format - Return the size/align/format of 'long
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/// double'.
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unsigned getLongDoubleWidth() const { return LongDoubleWidth; }
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unsigned getLongDoubleAlign() const { return LongDoubleAlign; }
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const llvm::fltSemantics &getLongDoubleFormat() const {
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return *LongDoubleFormat;
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}
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/// \brief Return true if the 'long double' type should be mangled like
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/// __float128.
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virtual bool useFloat128ManglingForLongDouble() const { return false; }
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/// \brief Return the value for the C99 FLT_EVAL_METHOD macro.
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virtual unsigned getFloatEvalMethod() const { return 0; }
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// getLargeArrayMinWidth/Align - Return the minimum array size that is
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// 'large' and its alignment.
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unsigned getLargeArrayMinWidth() const { return LargeArrayMinWidth; }
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unsigned getLargeArrayAlign() const { return LargeArrayAlign; }
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/// \brief Return the maximum width lock-free atomic operation which will
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/// ever be supported for the given target
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unsigned getMaxAtomicPromoteWidth() const { return MaxAtomicPromoteWidth; }
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/// \brief Return the maximum width lock-free atomic operation which can be
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/// inlined given the supported features of the given target.
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unsigned getMaxAtomicInlineWidth() const { return MaxAtomicInlineWidth; }
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/// \brief Returns true if the given target supports lock-free atomic
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/// operations at the specified width and alignment.
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virtual bool hasBuiltinAtomic(uint64_t AtomicSizeInBits,
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uint64_t AlignmentInBits) const {
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return AtomicSizeInBits <= AlignmentInBits &&
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AtomicSizeInBits <= getMaxAtomicInlineWidth() &&
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(AtomicSizeInBits <= getCharWidth() ||
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llvm::isPowerOf2_64(AtomicSizeInBits / getCharWidth()));
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}
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/// \brief Return the maximum vector alignment supported for the given target.
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unsigned getMaxVectorAlign() const { return MaxVectorAlign; }
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/// \brief Return default simd alignment for the given target. Generally, this
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/// value is type-specific, but this alignment can be used for most of the
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/// types for the given target.
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unsigned getSimdDefaultAlign() const { return SimdDefaultAlign; }
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/// \brief Return the size of intmax_t and uintmax_t for this target, in bits.
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unsigned getIntMaxTWidth() const {
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return getTypeWidth(IntMaxType);
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}
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// Return the size of unwind_word for this target.
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unsigned getUnwindWordWidth() const { return getPointerWidth(0); }
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/// \brief Return the "preferred" register width on this target.
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unsigned getRegisterWidth() const {
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// Currently we assume the register width on the target matches the pointer
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// width, we can introduce a new variable for this if/when some target wants
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// it.
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return PointerWidth;
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}
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/// \brief Returns the default value of the __USER_LABEL_PREFIX__ macro,
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/// which is the prefix given to user symbols by default.
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///
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/// On most platforms this is "_", but it is "" on some, and "." on others.
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const char *getUserLabelPrefix() const {
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return UserLabelPrefix;
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}
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/// \brief Returns the name of the mcount instrumentation function.
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const char *getMCountName() const {
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return MCountName;
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}
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/// \brief Check if the Objective-C built-in boolean type should be signed
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/// char.
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///
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/// Otherwise, if this returns false, the normal built-in boolean type
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/// should also be used for Objective-C.
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bool useSignedCharForObjCBool() const {
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return UseSignedCharForObjCBool;
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}
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void noSignedCharForObjCBool() {
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UseSignedCharForObjCBool = false;
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}
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/// \brief Check whether the alignment of bit-field types is respected
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/// when laying out structures.
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bool useBitFieldTypeAlignment() const {
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return UseBitFieldTypeAlignment;
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}
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/// \brief Check whether zero length bitfields should force alignment of
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/// the next member.
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bool useZeroLengthBitfieldAlignment() const {
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return UseZeroLengthBitfieldAlignment;
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}
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/// \brief Get the fixed alignment value in bits for a member that follows
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|
/// a zero length bitfield.
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unsigned getZeroLengthBitfieldBoundary() const {
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return ZeroLengthBitfieldBoundary;
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}
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/// \brief Check whether this target support '\#pragma options align=mac68k'.
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bool hasAlignMac68kSupport() const {
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return HasAlignMac68kSupport;
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}
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/// \brief Return the user string for the specified integer type enum.
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///
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/// For example, SignedShort -> "short".
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static const char *getTypeName(IntType T);
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/// \brief Return the constant suffix for the specified integer type enum.
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///
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/// For example, SignedLong -> "L".
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const char *getTypeConstantSuffix(IntType T) const;
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/// \brief Return the printf format modifier for the specified
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/// integer type enum.
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///
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/// For example, SignedLong -> "l".
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static const char *getTypeFormatModifier(IntType T);
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/// \brief Check whether the given real type should use the "fpret" flavor of
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/// Objective-C message passing on this target.
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bool useObjCFPRetForRealType(RealType T) const {
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return RealTypeUsesObjCFPRet & (1 << T);
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}
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/// \brief Check whether _Complex long double should use the "fp2ret" flavor
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/// of Objective-C message passing on this target.
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bool useObjCFP2RetForComplexLongDouble() const {
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return ComplexLongDoubleUsesFP2Ret;
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}
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|
|
/// \brief 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 --------------------------===//
|
|
|
|
/// \brief 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 void getTargetBuiltins(const Builtin::Info *&Records,
|
|
unsigned &NumRecords) const = 0;
|
|
|
|
/// 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; }
|
|
|
|
/// \brief Returns the kind of __builtin_va_list type that should be used
|
|
/// with this target.
|
|
virtual BuiltinVaListKind getBuiltinVaListKind() const = 0;
|
|
|
|
/// \brief 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;
|
|
|
|
/// \brief Returns whether the passed in string is a valid register name
|
|
/// according to GCC.
|
|
///
|
|
/// This is used by Sema for inline asm statements.
|
|
bool isValidGCCRegisterName(StringRef Name) const;
|
|
|
|
/// \brief Returns the "normalized" GCC register name.
|
|
///
|
|
/// For example, on x86 it will return "ax" when "eax" is passed in.
|
|
StringRef getNormalizedGCCRegisterName(StringRef Name) const;
|
|
|
|
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;
|
|
} ImmRange;
|
|
|
|
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;
|
|
}
|
|
|
|
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; }
|
|
|
|
/// \brief Return true if this output operand has a matching
|
|
/// (tied) input operand.
|
|
bool hasMatchingInput() const { return (Flags & CI_HasMatchingInput) != 0; }
|
|
|
|
/// \brief 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;
|
|
}
|
|
int getImmConstantMin() const { return ImmRange.Min; }
|
|
int getImmConstantMax() const { return 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;
|
|
}
|
|
|
|
/// \brief 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 the contents of the __builtin_cpu_supports(const char*) argument.
|
|
virtual bool validateCpuSupports(StringRef Name) const { return false; }
|
|
|
|
// 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(ConstraintInfo *OutputConstraints,
|
|
unsigned NumOutputs,
|
|
ConstraintInfo &info) const;
|
|
|
|
virtual bool validateOutputSize(StringRef /*Constraint*/,
|
|
unsigned /*Size*/) const {
|
|
return true;
|
|
}
|
|
|
|
virtual bool validateInputSize(StringRef /*Constraint*/,
|
|
unsigned /*Size*/) const {
|
|
return true;
|
|
}
|
|
virtual bool
|
|
validateConstraintModifier(StringRef /*Constraint*/,
|
|
char /*Modifier*/,
|
|
unsigned /*Size*/,
|
|
std::string &/*SuggestedModifier*/) const {
|
|
return true;
|
|
}
|
|
bool resolveSymbolicName(const char *&Name,
|
|
ConstraintInfo *OutputConstraints,
|
|
unsigned NumOutputs, 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);
|
|
}
|
|
|
|
/// \brief Returns true if NaN encoding is IEEE 754-2008.
|
|
/// Only MIPS allows a different encoding.
|
|
virtual bool isNan2008() const {
|
|
return true;
|
|
}
|
|
|
|
/// \brief Returns a string of target-specific clobbers, in LLVM format.
|
|
virtual const char *getClobbers() const = 0;
|
|
|
|
|
|
/// \brief Returns the target triple of the primary target.
|
|
const llvm::Triple &getTriple() const {
|
|
return Triple;
|
|
}
|
|
|
|
const char *getTargetDescription() const {
|
|
assert(DescriptionString);
|
|
return DescriptionString;
|
|
}
|
|
|
|
struct GCCRegAlias {
|
|
const char * const Aliases[5];
|
|
const char * const Register;
|
|
};
|
|
|
|
struct AddlRegName {
|
|
const char * const Names[5];
|
|
const unsigned RegNum;
|
|
};
|
|
|
|
/// \brief 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; }
|
|
|
|
/// \brief An optional hook that targets can implement to perform semantic
|
|
/// checking on attribute((section("foo"))) specifiers.
|
|
///
|
|
/// In this case, "foo" is passed in to be checked. If the section
|
|
/// specifier is invalid, the backend should return a non-empty string
|
|
/// that indicates the problem.
|
|
///
|
|
/// This hook is a simple quality of implementation feature to catch errors
|
|
/// and give good diagnostics in cases when the assembler or code generator
|
|
/// would otherwise reject the section specifier.
|
|
///
|
|
virtual std::string isValidSectionSpecifier(StringRef SR) const {
|
|
return "";
|
|
}
|
|
|
|
/// \brief Set forced language options.
|
|
///
|
|
/// Apply changes to the target information with respect to certain
|
|
/// language options which change the target configuration.
|
|
virtual void adjust(const LangOptions &Opts);
|
|
|
|
/// \brief Get the default set of target features for the CPU;
|
|
/// this should include all legal feature strings on the target.
|
|
virtual void getDefaultFeatures(llvm::StringMap<bool> &Features) const {
|
|
}
|
|
|
|
/// \brief Get the ABI currently in use.
|
|
virtual StringRef getABI() const { return StringRef(); }
|
|
|
|
/// \brief Get the C++ ABI currently in use.
|
|
TargetCXXABI getCXXABI() const {
|
|
return TheCXXABI;
|
|
}
|
|
|
|
/// \brief Target the specified CPU.
|
|
///
|
|
/// \return False on error (invalid CPU name).
|
|
virtual bool setCPU(const std::string &Name) {
|
|
return false;
|
|
}
|
|
|
|
/// \brief Use the specified ABI.
|
|
///
|
|
/// \return False on error (invalid ABI name).
|
|
virtual bool setABI(const std::string &Name) {
|
|
return false;
|
|
}
|
|
|
|
/// \brief Use the specified unit for FP math.
|
|
///
|
|
/// \return False on error (invalid unit name).
|
|
virtual bool setFPMath(StringRef Name) {
|
|
return false;
|
|
}
|
|
|
|
/// \brief Use this specified C++ ABI.
|
|
///
|
|
/// \return False on error (invalid C++ ABI name).
|
|
bool setCXXABI(llvm::StringRef name) {
|
|
TargetCXXABI ABI;
|
|
if (!ABI.tryParse(name)) return false;
|
|
return setCXXABI(ABI);
|
|
}
|
|
|
|
/// \brief Set the C++ ABI to be used by this implementation.
|
|
///
|
|
/// \return False on error (ABI not valid on this target)
|
|
virtual bool setCXXABI(TargetCXXABI ABI) {
|
|
TheCXXABI = ABI;
|
|
return true;
|
|
}
|
|
|
|
/// \brief 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;
|
|
}
|
|
|
|
/// \brief 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.
|
|
///
|
|
/// \return False on error.
|
|
virtual bool handleTargetFeatures(std::vector<std::string> &Features,
|
|
DiagnosticsEngine &Diags) {
|
|
return true;
|
|
}
|
|
|
|
/// \brief Determine whether the given target has the given feature.
|
|
virtual bool hasFeature(StringRef Feature) const {
|
|
return false;
|
|
}
|
|
|
|
// \brief Returns maximal number of args passed in registers.
|
|
unsigned getRegParmMax() const {
|
|
assert(RegParmMax < 7 && "RegParmMax value is larger than AST can handle");
|
|
return RegParmMax;
|
|
}
|
|
|
|
/// \brief Whether the target supports thread-local storage.
|
|
bool isTLSSupported() const {
|
|
return TLSSupported;
|
|
}
|
|
|
|
/// \brief 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 short getMaxTLSAlign() const {
|
|
return MaxTLSAlign;
|
|
}
|
|
|
|
/// \brief Whether the target supports SEH __try.
|
|
bool isSEHTrySupported() const {
|
|
return getTriple().isOSWindows() &&
|
|
(getTriple().getArch() == llvm::Triple::x86 ||
|
|
getTriple().getArch() == llvm::Triple::x86_64);
|
|
}
|
|
|
|
/// \brief 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;
|
|
}
|
|
|
|
/// \brief Return the register number that __builtin_eh_return_regno would
|
|
/// return with the specified argument.
|
|
virtual int getEHDataRegisterNumber(unsigned RegNo) const {
|
|
return -1;
|
|
}
|
|
|
|
/// \brief Return the section to use for C++ static initialization functions.
|
|
virtual const char *getStaticInitSectionSpecifier() const {
|
|
return nullptr;
|
|
}
|
|
|
|
const LangAS::Map &getAddressSpaceMap() const {
|
|
return *AddrSpaceMap;
|
|
}
|
|
|
|
/// \brief Retrieve the name of the platform as it is used in the
|
|
/// availability attribute.
|
|
StringRef getPlatformName() const { return PlatformName; }
|
|
|
|
/// \brief 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; }
|
|
|
|
enum CallingConvMethodType {
|
|
CCMT_Unknown,
|
|
CCMT_Member,
|
|
CCMT_NonMember
|
|
};
|
|
|
|
/// \brief Gets the default calling convention for the given target and
|
|
/// declaration context.
|
|
virtual CallingConv getDefaultCallingConv(CallingConvMethodType MT) 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,
|
|
};
|
|
|
|
/// \brief 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;
|
|
}
|
|
}
|
|
|
|
/// Controls if __builtin_longjmp / __builtin_setjmp can be lowered to
|
|
/// llvm.eh.sjlj.longjmp / llvm.eh.sjlj.setjmp.
|
|
virtual bool hasSjLjLowering() const {
|
|
return false;
|
|
}
|
|
|
|
protected:
|
|
virtual uint64_t getPointerWidthV(unsigned AddrSpace) const {
|
|
return PointerWidth;
|
|
}
|
|
virtual uint64_t getPointerAlignV(unsigned AddrSpace) const {
|
|
return PointerAlign;
|
|
}
|
|
virtual enum IntType getPtrDiffTypeV(unsigned AddrSpace) const {
|
|
return PtrDiffType;
|
|
}
|
|
virtual void getGCCRegNames(const char * const *&Names,
|
|
unsigned &NumNames) const = 0;
|
|
virtual void getGCCRegAliases(const GCCRegAlias *&Aliases,
|
|
unsigned &NumAliases) const = 0;
|
|
virtual void getGCCAddlRegNames(const AddlRegName *&Addl,
|
|
unsigned &NumAddl) const {
|
|
Addl = nullptr;
|
|
NumAddl = 0;
|
|
}
|
|
virtual bool validateAsmConstraint(const char *&Name,
|
|
TargetInfo::ConstraintInfo &info) const= 0;
|
|
};
|
|
|
|
} // end namespace clang
|
|
|
|
#endif
|