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>
23using namespace llvm;
24
25MCAsmInfo::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
97MCAsmInfo::~MCAsmInfo() {
98}
99
100
101unsigned 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
110unsigned 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
124const MCExpr *
125MCAsmInfo::getExprForPersonalitySymbol(const MCSymbol *Sym,
126                                       unsigned Encoding,
127                                       MCStreamer &Streamer) const {
128  return getExprForFDESymbol(Sym, Encoding, Streamer);
129}
130
131const MCExpr *
132MCAsmInfo::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