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 StructorOutputOrder = Structors::ReversePriorityOrder;
33 HasStaticCtorDtorReferenceInStaticMode = false;
34 LinkerRequiresNonEmptyDwarfLines = false;
35 MaxInstLength = 4;
36 PCSymbol = "$";
37 SeparatorString = ";";
38 CommentColumn = 40;
39 CommentString = "#";
40 LabelSuffix = ":";
41 GlobalPrefix = "";
42 PrivateGlobalPrefix = ".";
43 LinkerPrivateGlobalPrefix = "";
44 InlineAsmStart = "APP";
45 InlineAsmEnd = "NO_APP";
46 Code16Directive = ".code16";
47 Code32Directive = ".code32";
48 Code64Directive = ".code64";
49 AssemblerDialect = 0;
50 AllowQuotesInName = false;
51 AllowNameToStartWithDigit = false;
52 AllowPeriodsInName = true;
53 ZeroDirective = "\t.zero\t";
54 AsciiDirective = "\t.ascii\t";
55 AscizDirective = "\t.asciz\t";
56 Data8bitsDirective = "\t.byte\t";
57 Data16bitsDirective = "\t.short\t";
58 Data32bitsDirective = "\t.long\t";
59 Data64bitsDirective = "\t.quad\t";
60 DataBegin = "$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 GPRel32Directive = 0;
72 GlobalDirective = "\t.globl\t";
73 HasSetDirective = true;
74 HasAggressiveSymbolFolding = true;
75 LCOMMDirectiveType = LCOMM::None;
76 COMMDirectiveAlignmentIsInBytes = true;
77 HasDotTypeDotSizeDirective = true;
78 HasSingleParameterDotFile = true;
79 HasNoDeadStrip = false;
80 HasSymbolResolver = false;
81 WeakRefDirective = 0;
82 WeakDefDirective = 0;
83 LinkOnceDirective = 0;
84 HiddenVisibilityAttr = MCSA_Hidden;
85 HiddenDeclarationVisibilityAttr = MCSA_Hidden;
86 ProtectedVisibilityAttr = MCSA_Protected;
87 HasLEB128 = false;
88 SupportsDebugInformation = false;
89 ExceptionsType = ExceptionHandling::None;
90 DwarfUsesInlineInfoSection = false;
91 DwarfRequiresRelocationForSectionOffset = true;
92 DwarfSectionOffsetDirective = 0;
93 DwarfUsesLabelOffsetForRanges = true;
94 DwarfRegNumForCFI = false;
95 HasMicrosoftFastStdCallMangling = false;
96
97 AsmTransCBE = 0;
98 }
99
~MCAsmInfo()100 MCAsmInfo::~MCAsmInfo() {
101 }
102
103
getULEB128Size(unsigned Value)104 unsigned MCAsmInfo::getULEB128Size(unsigned Value) {
105 unsigned Size = 0;
106 do {
107 Value >>= 7;
108 Size += sizeof(int8_t);
109 } while (Value);
110 return Size;
111 }
112
getSLEB128Size(int Value)113 unsigned MCAsmInfo::getSLEB128Size(int Value) {
114 unsigned Size = 0;
115 int Sign = Value >> (8 * sizeof(Value) - 1);
116 bool IsMore;
117
118 do {
119 unsigned Byte = Value & 0x7f;
120 Value >>= 7;
121 IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
122 Size += sizeof(int8_t);
123 } while (IsMore);
124 return Size;
125 }
126
127 const MCExpr *
getExprForPersonalitySymbol(const MCSymbol * Sym,unsigned Encoding,MCStreamer & Streamer) const128 MCAsmInfo::getExprForPersonalitySymbol(const MCSymbol *Sym,
129 unsigned Encoding,
130 MCStreamer &Streamer) const {
131 return getExprForFDESymbol(Sym, Encoding, Streamer);
132 }
133
134 const MCExpr *
getExprForFDESymbol(const MCSymbol * Sym,unsigned Encoding,MCStreamer & Streamer) const135 MCAsmInfo::getExprForFDESymbol(const MCSymbol *Sym,
136 unsigned Encoding,
137 MCStreamer &Streamer) const {
138 if (!(Encoding & dwarf::DW_EH_PE_pcrel))
139 return MCSymbolRefExpr::Create(Sym, Streamer.getContext());
140
141 MCContext &Context = Streamer.getContext();
142 const MCExpr *Res = MCSymbolRefExpr::Create(Sym, Context);
143 MCSymbol *PCSym = Context.CreateTempSymbol();
144 Streamer.EmitLabel(PCSym);
145 const MCExpr *PC = MCSymbolRefExpr::Create(PCSym, Context);
146 return MCBinaryExpr::CreateSub(Res, PC, Context);
147 }
148