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
MCAsmInfo()25 MCAsmInfo::MCAsmInfo() {
26 PointerSize = 4;
27 IsLittleEndian = true;
28 StackGrowsUp = false;
29 HasSubsectionsViaSymbols = false;
30 HasMachoZeroFillDirective = false;
31 HasMachoTBSSDirective = false;
32 HasStaticCtorDtorReferenceInStaticMode = false;
33 LinkerRequiresNonEmptyDwarfLines = false;
34 MaxInstLength = 4;
35 PCSymbol = "$";
36 SeparatorString = ";";
37 CommentColumn = 40;
38 CommentString = "#";
39 LabelSuffix = ":";
40 GlobalPrefix = "";
41 PrivateGlobalPrefix = ".";
42 LinkerPrivateGlobalPrefix = "";
43 InlineAsmStart = "APP";
44 InlineAsmEnd = "NO_APP";
45 Code16Directive = ".code16";
46 Code32Directive = ".code32";
47 Code64Directive = ".code64";
48 AssemblerDialect = 0;
49 AllowQuotesInName = false;
50 AllowNameToStartWithDigit = false;
51 AllowPeriodsInName = true;
52 AllowUTF8 = true;
53 ZeroDirective = "\t.zero\t";
54 AsciiDirective = "\t.ascii\t";
55 AscizDirective = "\t.asciz\t";
56 Data8bitsDirective = "\t.byte\t";
57 Data16bitsDirective = "\t.short\t";
58 Data32bitsDirective = "\t.long\t";
59 Data64bitsDirective = "\t.quad\t";
60 DataBegin = "$d.";
61 CodeBegin = "$a.";
62 JT8Begin = "$d.";
63 JT16Begin = "$d.";
64 JT32Begin = "$d.";
65 SupportsDataRegions = false;
66 SunStyleELFSectionSwitchSyntax = false;
67 UsesELFSectionDirectiveForBSS = false;
68 AlignDirective = "\t.align\t";
69 AlignmentIsInBytes = true;
70 TextAlignFillValue = 0;
71 GPRel64Directive = 0;
72 GPRel32Directive = 0;
73 GlobalDirective = "\t.globl\t";
74 HasSetDirective = true;
75 HasAggressiveSymbolFolding = true;
76 LCOMMDirectiveType = LCOMM::None;
77 COMMDirectiveAlignmentIsInBytes = true;
78 HasDotTypeDotSizeDirective = true;
79 HasSingleParameterDotFile = true;
80 HasNoDeadStrip = false;
81 HasSymbolResolver = false;
82 WeakRefDirective = 0;
83 WeakDefDirective = 0;
84 LinkOnceDirective = 0;
85 HiddenVisibilityAttr = MCSA_Hidden;
86 HiddenDeclarationVisibilityAttr = MCSA_Hidden;
87 ProtectedVisibilityAttr = MCSA_Protected;
88 HasLEB128 = false;
89 SupportsDebugInformation = false;
90 ExceptionsType = ExceptionHandling::None;
91 DwarfUsesInlineInfoSection = false;
92 DwarfRequiresRelocationForSectionOffset = true;
93 DwarfSectionOffsetDirective = 0;
94 DwarfUsesLabelOffsetForRanges = true;
95 DwarfUsesRelocationsForStringPool = true;
96 DwarfRegNumForCFI = false;
97 HasMicrosoftFastStdCallMangling = false;
98
99 AsmTransCBE = 0;
100 }
101
~MCAsmInfo()102 MCAsmInfo::~MCAsmInfo() {
103 }
104
105
getULEB128Size(unsigned Value)106 unsigned MCAsmInfo::getULEB128Size(unsigned Value) {
107 unsigned Size = 0;
108 do {
109 Value >>= 7;
110 Size += sizeof(int8_t);
111 } while (Value);
112 return Size;
113 }
114
getSLEB128Size(int Value)115 unsigned MCAsmInfo::getSLEB128Size(int Value) {
116 unsigned Size = 0;
117 int Sign = Value >> (8 * sizeof(Value) - 1);
118 bool IsMore;
119
120 do {
121 unsigned Byte = Value & 0x7f;
122 Value >>= 7;
123 IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
124 Size += sizeof(int8_t);
125 } while (IsMore);
126 return Size;
127 }
128
129 const MCExpr *
getExprForPersonalitySymbol(const MCSymbol * Sym,unsigned Encoding,MCStreamer & Streamer) const130 MCAsmInfo::getExprForPersonalitySymbol(const MCSymbol *Sym,
131 unsigned Encoding,
132 MCStreamer &Streamer) const {
133 return getExprForFDESymbol(Sym, Encoding, Streamer);
134 }
135
136 const MCExpr *
getExprForFDESymbol(const MCSymbol * Sym,unsigned Encoding,MCStreamer & Streamer) const137 MCAsmInfo::getExprForFDESymbol(const MCSymbol *Sym,
138 unsigned Encoding,
139 MCStreamer &Streamer) const {
140 if (!(Encoding & dwarf::DW_EH_PE_pcrel))
141 return MCSymbolRefExpr::Create(Sym, Streamer.getContext());
142
143 MCContext &Context = Streamer.getContext();
144 const MCExpr *Res = MCSymbolRefExpr::Create(Sym, Context);
145 MCSymbol *PCSym = Context.CreateTempSymbol();
146 Streamer.EmitLabel(PCSym);
147 const MCExpr *PC = MCSymbolRefExpr::Create(PCSym, Context);
148 return MCBinaryExpr::CreateSub(Res, PC, Context);
149 }
150