1 //===-- MCAsmInfo.cpp - Asm Info -------------------------------------------==// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file defines target asm properties related what form asm statements 11 // should take. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #include "llvm/MC/MCAsmInfo.h" 16 #include "llvm/MC/MCContext.h" 17 #include "llvm/MC/MCExpr.h" 18 #include "llvm/MC/MCStreamer.h" 19 #include "llvm/Support/DataTypes.h" 20 #include "llvm/Support/Dwarf.h" 21 #include <cctype> 22 #include <cstring> 23 using namespace llvm; 24 25 MCAsmInfo::MCAsmInfo() { 26 PointerSize = 4; 27 CalleeSaveStackSlotSize = 4; 28 29 IsLittleEndian = true; 30 StackGrowsUp = false; 31 HasSubsectionsViaSymbols = false; 32 HasMachoZeroFillDirective = false; 33 HasMachoTBSSDirective = false; 34 HasStaticCtorDtorReferenceInStaticMode = false; 35 MaxInstLength = 4; 36 MinInstAlignment = 1; 37 DollarIsPC = false; 38 SeparatorString = ";"; 39 CommentString = "#"; 40 LabelSuffix = ":"; 41 UseAssignmentForEHBegin = false; 42 NeedsLocalForSize = false; 43 PrivateGlobalPrefix = "L"; 44 PrivateLabelPrefix = PrivateGlobalPrefix; 45 LinkerPrivateGlobalPrefix = ""; 46 InlineAsmStart = "APP"; 47 InlineAsmEnd = "NO_APP"; 48 Code16Directive = ".code16"; 49 Code32Directive = ".code32"; 50 Code64Directive = ".code64"; 51 AssemblerDialect = 0; 52 AllowAtInName = false; 53 UseDataRegionDirectives = false; 54 ZeroDirective = "\t.zero\t"; 55 AsciiDirective = "\t.ascii\t"; 56 AscizDirective = "\t.asciz\t"; 57 Data8bitsDirective = "\t.byte\t"; 58 Data16bitsDirective = "\t.short\t"; 59 Data32bitsDirective = "\t.long\t"; 60 Data64bitsDirective = "\t.quad\t"; 61 SunStyleELFSectionSwitchSyntax = false; 62 UsesELFSectionDirectiveForBSS = false; 63 AlignmentIsInBytes = true; 64 TextAlignFillValue = 0; 65 GPRel64Directive = nullptr; 66 GPRel32Directive = nullptr; 67 GlobalDirective = "\t.globl\t"; 68 SetDirectiveSuppressesReloc = false; 69 HasAggressiveSymbolFolding = true; 70 COMMDirectiveAlignmentIsInBytes = true; 71 LCOMMDirectiveAlignmentType = LCOMM::NoAlignment; 72 HasFunctionAlignment = true; 73 HasDotTypeDotSizeDirective = true; 74 HasSingleParameterDotFile = true; 75 HasIdentDirective = false; 76 HasNoDeadStrip = false; 77 WeakDirective = "\t.weak\t"; 78 WeakRefDirective = nullptr; 79 HasWeakDefDirective = false; 80 HasWeakDefCanBeHiddenDirective = false; 81 HasLinkOnceDirective = false; 82 HiddenVisibilityAttr = MCSA_Hidden; 83 HiddenDeclarationVisibilityAttr = MCSA_Hidden; 84 ProtectedVisibilityAttr = MCSA_Protected; 85 SupportsDebugInformation = false; 86 ExceptionsType = ExceptionHandling::None; 87 WinEHEncodingType = WinEH::EncodingType::Invalid; 88 DwarfUsesRelocationsAcrossSections = true; 89 DwarfFDESymbolsUseAbsDiff = false; 90 DwarfRegNumForCFI = false; 91 NeedsDwarfSectionOffsetDirective = false; 92 UseParensForSymbolVariant = false; 93 94 // FIXME: Clang's logic should be synced with the logic used to initialize 95 // this member and the two implementations should be merged. 96 // For reference: 97 // - Solaris always enables the integrated assembler by default 98 // - SparcELFMCAsmInfo and X86ELFMCAsmInfo are handling this case 99 // - Windows always enables the integrated assembler by default 100 // - MCAsmInfoCOFF is handling this case, should it be MCAsmInfoMicrosoft? 101 // - MachO targets always enables the integrated assembler by default 102 // - MCAsmInfoDarwin is handling this case 103 // - Generic_GCC toolchains enable the integrated assembler on a per 104 // architecture basis. 105 // - The target subclasses for AArch64, ARM, and X86 handle these cases 106 UseIntegratedAssembler = false; 107 108 CompressDebugSections = false; 109 } 110 111 MCAsmInfo::~MCAsmInfo() { 112 } 113 114 bool MCAsmInfo::isSectionAtomizableBySymbols(const MCSection &Section) const { 115 return false; 116 } 117 118 const MCExpr * 119 MCAsmInfo::getExprForPersonalitySymbol(const MCSymbol *Sym, 120 unsigned Encoding, 121 MCStreamer &Streamer) const { 122 return getExprForFDESymbol(Sym, Encoding, Streamer); 123 } 124 125 const MCExpr * 126 MCAsmInfo::getExprForFDESymbol(const MCSymbol *Sym, 127 unsigned Encoding, 128 MCStreamer &Streamer) const { 129 if (!(Encoding & dwarf::DW_EH_PE_pcrel)) 130 return MCSymbolRefExpr::Create(Sym, Streamer.getContext()); 131 132 MCContext &Context = Streamer.getContext(); 133 const MCExpr *Res = MCSymbolRefExpr::Create(Sym, Context); 134 MCSymbol *PCSym = Context.CreateTempSymbol(); 135 Streamer.EmitLabel(PCSym); 136 const MCExpr *PC = MCSymbolRefExpr::Create(PCSym, Context); 137 return MCBinaryExpr::CreateSub(Res, PC, Context); 138 } 139
