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 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 AlignDirective = "\t.align\t";
64 AlignmentIsInBytes = true;
65 TextAlignFillValue = 0;
66 GPRel64Directive = 0;
67 GPRel32Directive = 0;
68 GlobalDirective = "\t.globl\t";
69 HasSetDirective = true;
70 HasAggressiveSymbolFolding = true;
71 COMMDirectiveAlignmentIsInBytes = true;
72 LCOMMDirectiveAlignmentType = LCOMM::NoAlignment;
73 HasDotTypeDotSizeDirective = true;
74 HasSingleParameterDotFile = true;
75 HasNoDeadStrip = false;
76 HasSymbolResolver = false;
77 WeakRefDirective = 0;
78 WeakDefDirective = 0;
79 LinkOnceDirective = 0;
80 HiddenVisibilityAttr = MCSA_Hidden;
81 HiddenDeclarationVisibilityAttr = MCSA_Hidden;
82 ProtectedVisibilityAttr = MCSA_Protected;
83 HasLEB128 = false;
84 SupportsDebugInformation = false;
85 ExceptionsType = ExceptionHandling::None;
86 DwarfUsesInlineInfoSection = false;
87 DwarfSectionOffsetDirective = 0;
88 DwarfUsesRelocationsAcrossSections = true;
89 DwarfRegNumForCFI = false;
90 HasMicrosoftFastStdCallMangling = false;
91 }
92
~MCAsmInfo()93 MCAsmInfo::~MCAsmInfo() {
94 }
95
96
getULEB128Size(unsigned Value)97 unsigned MCAsmInfo::getULEB128Size(unsigned Value) {
98 unsigned Size = 0;
99 do {
100 Value >>= 7;
101 Size += sizeof(int8_t);
102 } while (Value);
103 return Size;
104 }
105
getSLEB128Size(int Value)106 unsigned MCAsmInfo::getSLEB128Size(int Value) {
107 unsigned Size = 0;
108 int Sign = Value >> (8 * sizeof(Value) - 1);
109 bool IsMore;
110
111 do {
112 unsigned Byte = Value & 0x7f;
113 Value >>= 7;
114 IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
115 Size += sizeof(int8_t);
116 } while (IsMore);
117 return Size;
118 }
119
120 const MCExpr *
getExprForPersonalitySymbol(const MCSymbol * Sym,unsigned Encoding,MCStreamer & Streamer) const121 MCAsmInfo::getExprForPersonalitySymbol(const MCSymbol *Sym,
122 unsigned Encoding,
123 MCStreamer &Streamer) const {
124 return getExprForFDESymbol(Sym, Encoding, Streamer);
125 }
126
127 const MCExpr *
getExprForFDESymbol(const MCSymbol * Sym,unsigned Encoding,MCStreamer & Streamer) const128 MCAsmInfo::getExprForFDESymbol(const MCSymbol *Sym,
129 unsigned Encoding,
130 MCStreamer &Streamer) const {
131 if (!(Encoding & dwarf::DW_EH_PE_pcrel))
132 return MCSymbolRefExpr::Create(Sym, Streamer.getContext());
133
134 MCContext &Context = Streamer.getContext();
135 const MCExpr *Res = MCSymbolRefExpr::Create(Sym, Context);
136 MCSymbol *PCSym = Context.CreateTempSymbol();
137 Streamer.EmitLabel(PCSym);
138 const MCExpr *PC = MCSymbolRefExpr::Create(PCSym, Context);
139 return MCBinaryExpr::CreateSub(Res, PC, Context);
140 }
141