lib/MC/MCAsmInfo.cpp

   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/System/DataTypes.h"
  17 #include <cctype>
  18 #include <cstring>
  19 using namespace llvm;
  20
  21 MCAsmInfo::MCAsmInfo() {
  22   HasSubsectionsViaSymbols = false;
  23   HasMachoZeroFillDirective = false;
  24   HasMachoTBSSDirective = false;
  25   HasStaticCtorDtorReferenceInStaticMode = false;
  26   MaxInstLength = 4;
  27   PCSymbol = "$";
  28   SeparatorChar = ';';
  29   CommentColumn = 40;
  30   CommentString = "#";
  31   LabelSuffix = ":";
  32   GlobalPrefix = "";
  33   PrivateGlobalPrefix = ".";
  34   LinkerPrivateGlobalPrefix = "";
  35   InlineAsmStart = "APP";
  36   InlineAsmEnd = "NO_APP";
  37   AssemblerDialect = 0;
  38   AllowQuotesInName = false;
  39   AllowNameToStartWithDigit = false;
  40   AllowPeriodsInName = true;
  41   ZeroDirective = "\t.zero\t";
  42   AsciiDirective = "\t.ascii\t";
  43   AscizDirective = "\t.asciz\t";
  44   Data8bitsDirective = "\t.byte\t";
  45   Data16bitsDirective = "\t.short\t";
  46   Data32bitsDirective = "\t.long\t";
  47   Data64bitsDirective = "\t.quad\t";
  48   SunStyleELFSectionSwitchSyntax = false;
  49   UsesELFSectionDirectiveForBSS = false;
  50   AlignDirective = "\t.align\t";
  51   AlignmentIsInBytes = true;
  52   TextAlignFillValue = 0;
  53   GPRel32Directive = 0;
  54   GlobalDirective = "\t.globl\t";
  55   HasSetDirective = true;
  56   HasLCOMMDirective = false;
  57   COMMDirectiveAlignmentIsInBytes = true;
  58   HasDotTypeDotSizeDirective = true;
  59   HasSingleParameterDotFile = true;
  60   HasNoDeadStrip = false;
  61   WeakRefDirective = 0;
  62   WeakDefDirective = 0;
  63   LinkOnceDirective = 0;
  64   HiddenVisibilityAttr = MCSA_Hidden;
  65   ProtectedVisibilityAttr = MCSA_Protected;
  66   HasLEB128 = false;
  67   HasDotLocAndDotFile = false;
  68   SupportsDebugInformation = false;
  69   ExceptionsType = ExceptionHandling::None;
  70   DwarfRequiresFrameSection = true;
  71   DwarfUsesInlineInfoSection = false;
  72   DwarfUsesAbsoluteLabelForStmtList = true;
  73   DwarfSectionOffsetDirective = 0;
  74   DwarfUsesLabelOffsetForRanges = true;
  75   HasMicrosoftFastStdCallMangling = false;
  76
  77   AsmTransCBE = 0;
  78 }
  79
  80 MCAsmInfo::~MCAsmInfo() {
  81 }
  82
  83
  84 unsigned MCAsmInfo::getULEB128Size(unsigned Value) {
  85   unsigned Size = 0;
  86   do {
  87     Value >>= 7;
  88     Size += sizeof(int8_t);
  89   } while (Value);
  90   return Size;
  91 }
  92
  93 unsigned MCAsmInfo::getSLEB128Size(int Value) {
  94   unsigned Size = 0;
  95   int Sign = Value >> (8 * sizeof(Value) - 1);
  96   bool IsMore;
  97
  98   do {
  99     unsigned Byte = Value & 0x7f;
 100     Value >>= 7;
 101     IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
 102     Size += sizeof(int8_t);
 103   } while (IsMore);
 104   return Size;
 105 }