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 CalleeSaveStackSlotSize = 4;
28
29 IsLittleEndian = true;
30 StackGrowsUp = false;
31 HasSubsectionsViaSymbols = false;
32 HasMachoZeroFillDirective = false;
33 HasMachoTBSSDirective = false;
34 HasStaticCtorDtorReferenceInStaticMode = false;
35 LinkerRequiresNonEmptyDwarfLines = false;
36 MaxInstLength = 4;
37 MinInstAlignment = 1;
38 PCSymbol = "$";
39 SeparatorString = ";";
40 CommentColumn = 40;
41 CommentString = "#";
42 LabelSuffix = ":";
43 DebugLabelSuffix = ":";
44 GlobalPrefix = "";
45 PrivateGlobalPrefix = ".";
46 LinkerPrivateGlobalPrefix = "";
47 InlineAsmStart = "APP";
48 InlineAsmEnd = "NO_APP";
49 Code16Directive = ".code16";
50 Code32Directive = ".code32";
51 Code64Directive = ".code64";
52 AssemblerDialect = 0;
53 AllowQuotesInName = false;
54 AllowNameToStartWithDigit = false;
55 AllowPeriodsInName = true;
56 AllowUTF8 = true;
57 UseDataRegionDirectives = false;
58 ZeroDirective = "\t.zero\t";
59 AsciiDirective = "\t.ascii\t";
60 AscizDirective = "\t.asciz\t";
61 Data8bitsDirective = "\t.byte\t";
62 Data16bitsDirective = "\t.short\t";
63 Data32bitsDirective = "\t.long\t";
64 Data64bitsDirective = "\t.quad\t";
65 SunStyleELFSectionSwitchSyntax = false;
66 UsesELFSectionDirectiveForBSS = false;
67 AlignDirective = "\t.align\t";
68 AlignmentIsInBytes = true;
69 TextAlignFillValue = 0;
70 GPRel64Directive = 0;
71 GPRel32Directive = 0;
72 GlobalDirective = "\t.globl\t";
73 HasSetDirective = true;
74 HasAggressiveSymbolFolding = true;
75 COMMDirectiveAlignmentIsInBytes = true;
76 LCOMMDirectiveAlignmentType = LCOMM::NoAlignment;
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 DwarfUsesRelocationsAcrossSections = true;
92 DwarfRegNumForCFI = false;
93 HasMicrosoftFastStdCallMangling = false;
94 NeedsDwarfSectionOffsetDirective = false;
95 }
96
~MCAsmInfo()97 MCAsmInfo::~MCAsmInfo() {
98 }
99
100
getULEB128Size(uint64_t Value)101 unsigned MCAsmInfo::getULEB128Size(uint64_t Value) {
102 unsigned Size = 0;
103 do {
104 Value >>= 7;
105 Size += sizeof(int8_t);
106 } while (Value);
107 return Size;
108 }
109
getSLEB128Size(int64_t Value)110 unsigned MCAsmInfo::getSLEB128Size(int64_t Value) {
111 unsigned Size = 0;
112 int Sign = Value >> (8 * sizeof(Value) - 1);
113 bool IsMore;
114
115 do {
116 unsigned Byte = Value & 0x7f;
117 Value >>= 7;
118 IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
119 Size += sizeof(int8_t);
120 } while (IsMore);
121 return Size;
122 }
123
124 const MCExpr *
getExprForPersonalitySymbol(const MCSymbol * Sym,unsigned Encoding,MCStreamer & Streamer) const125 MCAsmInfo::getExprForPersonalitySymbol(const MCSymbol *Sym,
126 unsigned Encoding,
127 MCStreamer &Streamer) const {
128 return getExprForFDESymbol(Sym, Encoding, Streamer);
129 }
130
131 const MCExpr *
getExprForFDESymbol(const MCSymbol * Sym,unsigned Encoding,MCStreamer & Streamer) const132 MCAsmInfo::getExprForFDESymbol(const MCSymbol *Sym,
133 unsigned Encoding,
134 MCStreamer &Streamer) const {
135 if (!(Encoding & dwarf::DW_EH_PE_pcrel))
136 return MCSymbolRefExpr::Create(Sym, Streamer.getContext());
137
138 MCContext &Context = Streamer.getContext();
139 const MCExpr *Res = MCSymbolRefExpr::Create(Sym, Context);
140 MCSymbol *PCSym = Context.CreateTempSymbol();
141 Streamer.EmitLabel(PCSym);
142 const MCExpr *PC = MCSymbolRefExpr::Create(PCSym, Context);
143 return MCBinaryExpr::CreateSub(Res, PC, Context);
144 }
145