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e1f835ab59
This matches other assemblers and is less unexpected (e.g. PR23227). On ELF, I tried binutils gas v2.24 and nasm 2.10.09, and they both agree on LShr. On COFF, I couldn't get my hands on an assembler yet, so don't change the behavior. For now, don't change it on non-AArch64 Darwin either, as the other assembler is gas v1.38, which does an AShr. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235963 91177308-0d34-0410-b5e6-96231b3b80d8
140 lines
4.7 KiB
C++
140 lines
4.7 KiB
C++
//===-- MCAsmInfo.cpp - Asm Info -------------------------------------------==//
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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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// This file defines target asm properties related what form asm statements
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// should take.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/Support/DataTypes.h"
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#include "llvm/Support/Dwarf.h"
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#include <cctype>
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#include <cstring>
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using namespace llvm;
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MCAsmInfo::MCAsmInfo() {
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PointerSize = 4;
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CalleeSaveStackSlotSize = 4;
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IsLittleEndian = true;
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StackGrowsUp = false;
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HasSubsectionsViaSymbols = false;
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HasMachoZeroFillDirective = false;
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HasMachoTBSSDirective = false;
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HasStaticCtorDtorReferenceInStaticMode = false;
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MaxInstLength = 4;
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MinInstAlignment = 1;
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DollarIsPC = false;
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SeparatorString = ";";
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CommentString = "#";
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LabelSuffix = ":";
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UseAssignmentForEHBegin = false;
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NeedsLocalForSize = false;
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PrivateGlobalPrefix = "L";
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PrivateLabelPrefix = PrivateGlobalPrefix;
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LinkerPrivateGlobalPrefix = "";
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InlineAsmStart = "APP";
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InlineAsmEnd = "NO_APP";
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Code16Directive = ".code16";
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Code32Directive = ".code32";
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Code64Directive = ".code64";
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AssemblerDialect = 0;
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AllowAtInName = false;
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UseDataRegionDirectives = false;
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ZeroDirective = "\t.zero\t";
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AsciiDirective = "\t.ascii\t";
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AscizDirective = "\t.asciz\t";
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Data8bitsDirective = "\t.byte\t";
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Data16bitsDirective = "\t.short\t";
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Data32bitsDirective = "\t.long\t";
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Data64bitsDirective = "\t.quad\t";
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SunStyleELFSectionSwitchSyntax = false;
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UsesELFSectionDirectiveForBSS = false;
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AlignmentIsInBytes = true;
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TextAlignFillValue = 0;
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GPRel64Directive = nullptr;
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GPRel32Directive = nullptr;
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GlobalDirective = "\t.globl\t";
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SetDirectiveSuppressesReloc = false;
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HasAggressiveSymbolFolding = true;
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COMMDirectiveAlignmentIsInBytes = true;
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LCOMMDirectiveAlignmentType = LCOMM::NoAlignment;
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HasFunctionAlignment = true;
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HasDotTypeDotSizeDirective = true;
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HasSingleParameterDotFile = true;
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HasIdentDirective = false;
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HasNoDeadStrip = false;
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WeakDirective = "\t.weak\t";
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WeakRefDirective = nullptr;
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HasWeakDefDirective = false;
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HasWeakDefCanBeHiddenDirective = false;
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HasLinkOnceDirective = false;
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HiddenVisibilityAttr = MCSA_Hidden;
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HiddenDeclarationVisibilityAttr = MCSA_Hidden;
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ProtectedVisibilityAttr = MCSA_Protected;
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SupportsDebugInformation = false;
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ExceptionsType = ExceptionHandling::None;
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WinEHEncodingType = WinEH::EncodingType::Invalid;
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DwarfUsesRelocationsAcrossSections = true;
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DwarfFDESymbolsUseAbsDiff = false;
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DwarfRegNumForCFI = false;
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NeedsDwarfSectionOffsetDirective = false;
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UseParensForSymbolVariant = false;
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UseLogicalShr = true;
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// FIXME: Clang's logic should be synced with the logic used to initialize
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// this member and the two implementations should be merged.
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// For reference:
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// - Solaris always enables the integrated assembler by default
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// - SparcELFMCAsmInfo and X86ELFMCAsmInfo are handling this case
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// - Windows always enables the integrated assembler by default
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// - MCAsmInfoCOFF is handling this case, should it be MCAsmInfoMicrosoft?
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// - MachO targets always enables the integrated assembler by default
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// - MCAsmInfoDarwin is handling this case
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// - Generic_GCC toolchains enable the integrated assembler on a per
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// architecture basis.
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// - The target subclasses for AArch64, ARM, and X86 handle these cases
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UseIntegratedAssembler = false;
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CompressDebugSections = false;
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}
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MCAsmInfo::~MCAsmInfo() {
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}
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bool MCAsmInfo::isSectionAtomizableBySymbols(const MCSection &Section) const {
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return false;
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}
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const MCExpr *
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MCAsmInfo::getExprForPersonalitySymbol(const MCSymbol *Sym,
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unsigned Encoding,
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MCStreamer &Streamer) const {
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return getExprForFDESymbol(Sym, Encoding, Streamer);
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}
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const MCExpr *
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MCAsmInfo::getExprForFDESymbol(const MCSymbol *Sym,
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unsigned Encoding,
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MCStreamer &Streamer) const {
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if (!(Encoding & dwarf::DW_EH_PE_pcrel))
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return MCSymbolRefExpr::Create(Sym, Streamer.getContext());
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MCContext &Context = Streamer.getContext();
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const MCExpr *Res = MCSymbolRefExpr::Create(Sym, Context);
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MCSymbol *PCSym = Context.CreateTempSymbol();
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Streamer.EmitLabel(PCSym);
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const MCExpr *PC = MCSymbolRefExpr::Create(PCSym, Context);
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return MCBinaryExpr::CreateSub(Res, PC, Context);
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}
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