1 //===-- MCAsmInfo.cpp - Asm Info -------------------------------------------==//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines target asm properties related what form asm statements
13 //===----------------------------------------------------------------------===//
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"
25 MCAsmInfo::MCAsmInfo() {
27 CalleeSaveStackSlotSize = 4;
29 IsLittleEndian = true;
31 HasSubsectionsViaSymbols = false;
32 HasMachoZeroFillDirective = false;
33 HasMachoTBSSDirective = false;
37 SeparatorString = ";";
40 UseAssignmentForEHBegin = false;
41 NeedsLocalForSize = false;
42 PrivateGlobalPrefix = "L";
43 PrivateLabelPrefix = PrivateGlobalPrefix;
44 LinkerPrivateGlobalPrefix = "";
45 InlineAsmStart = "APP";
46 InlineAsmEnd = "NO_APP";
47 Code16Directive = ".code16";
48 Code32Directive = ".code32";
49 Code64Directive = ".code64";
51 AllowAtInName = false;
52 SupportsQuotedNames = true;
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;
78 WeakDirective = "\t.weak\t";
79 WeakRefDirective = nullptr;
80 HasWeakDefDirective = false;
81 HasWeakDefCanBeHiddenDirective = false;
82 HasLinkOnceDirective = false;
83 HiddenVisibilityAttr = MCSA_Hidden;
84 HiddenDeclarationVisibilityAttr = MCSA_Hidden;
85 ProtectedVisibilityAttr = MCSA_Protected;
86 SupportsDebugInformation = false;
87 ExceptionsType = ExceptionHandling::None;
88 WinEHEncodingType = WinEH::EncodingType::Invalid;
89 DwarfUsesRelocationsAcrossSections = true;
90 DwarfFDESymbolsUseAbsDiff = false;
91 DwarfRegNumForCFI = false;
92 NeedsDwarfSectionOffsetDirective = false;
93 UseParensForSymbolVariant = false;
96 // FIXME: Clang's logic should be synced with the logic used to initialize
97 // this member and the two implementations should be merged.
99 // - Solaris always enables the integrated assembler by default
100 // - SparcELFMCAsmInfo and X86ELFMCAsmInfo are handling this case
101 // - Windows always enables the integrated assembler by default
102 // - MCAsmInfoCOFF is handling this case, should it be MCAsmInfoMicrosoft?
103 // - MachO targets always enables the integrated assembler by default
104 // - MCAsmInfoDarwin is handling this case
105 // - Generic_GCC toolchains enable the integrated assembler on a per
106 // architecture basis.
107 // - The target subclasses for AArch64, ARM, and X86 handle these cases
108 UseIntegratedAssembler = false;
109 PreserveAsmComments = true;
111 CompressDebugSections = DebugCompressionType::DCT_None;
114 MCAsmInfo::~MCAsmInfo() {
117 bool MCAsmInfo::isSectionAtomizableBySymbols(const MCSection &Section) const {
122 MCAsmInfo::getExprForPersonalitySymbol(const MCSymbol *Sym,
124 MCStreamer &Streamer) const {
125 return getExprForFDESymbol(Sym, Encoding, Streamer);
129 MCAsmInfo::getExprForFDESymbol(const MCSymbol *Sym,
131 MCStreamer &Streamer) const {
132 if (!(Encoding & dwarf::DW_EH_PE_pcrel))
133 return MCSymbolRefExpr::create(Sym, Streamer.getContext());
135 MCContext &Context = Streamer.getContext();
136 const MCExpr *Res = MCSymbolRefExpr::create(Sym, Context);
137 MCSymbol *PCSym = Context.createTempSymbol();
138 Streamer.EmitLabel(PCSym);
139 const MCExpr *PC = MCSymbolRefExpr::create(PCSym, Context);
140 return MCBinaryExpr::createSub(Res, PC, Context);
143 static bool isAcceptableChar(char C) {
144 return (C >= 'a' && C <= 'z') || (C >= 'A' && C <= 'Z') ||
145 (C >= '0' && C <= '9') || C == '_' || C == '$' || C == '.' || C == '@';
148 bool MCAsmInfo::isValidUnquotedName(StringRef Name) const {
152 // If any of the characters in the string is an unacceptable character, force
154 for (char C : Name) {
155 if (!isAcceptableChar(C))
162 bool MCAsmInfo::shouldOmitSectionDirective(StringRef SectionName) const {
163 // FIXME: Does .section .bss/.data/.text work everywhere??
164 return SectionName == ".text" || SectionName == ".data" ||
165 (SectionName == ".bss" && !usesELFSectionDirectiveForBSS());