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/Support/DataTypes.h"
  17 #include <cctype>
  18 #include <cstring>
  19 using namespace llvm;
  20
  21 MCAsmInfo::MCAsmInfo() {
  22   ZeroFillDirective = 0;
  23   NonexecutableStackDirective = 0;
  24   NeedsSet = false;
  25   MaxInstLength = 4;
  26   PCSymbol = "$";
  27   SeparatorChar = ';';
  28   CommentColumn = 60;
  29   CommentString = "#";
  30   GlobalPrefix = "";
  31   PrivateGlobalPrefix = ".";
  32   LinkerPrivateGlobalPrefix = "";
  33   InlineAsmStart = "APP";
  34   InlineAsmEnd = "NO_APP";
  35   AssemblerDialect = 0;
  36   AllowQuotesInName = false;
  37   ZeroDirective = "\t.zero\t";
  38   ZeroDirectiveSuffix = 0;
  39   AsciiDirective = "\t.ascii\t";
  40   AscizDirective = "\t.asciz\t";
  41   Data8bitsDirective = "\t.byte\t";
  42   Data16bitsDirective = "\t.short\t";
  43   Data32bitsDirective = "\t.long\t";
  44   Data64bitsDirective = "\t.quad\t";
  45   SunStyleELFSectionSwitchSyntax = false;
  46   UsesELFSectionDirectiveForBSS = false;
  47   AlignDirective = "\t.align\t";
  48   AlignmentIsInBytes = true;
  49   TextAlignFillValue = 0;
  50   JumpTableDirective = 0;
  51   PICJumpTableDirective = 0;
  52   GlobalDirective = "\t.globl\t";
  53   SetDirective = 0;
  54   LCOMMDirective = 0;
  55   COMMDirective = "\t.comm\t";
  56   COMMDirectiveTakesAlignment = true;
  57   HasDotTypeDotSizeDirective = true;
  58   HasSingleParameterDotFile = true;
  59   UsedDirective = 0;
  60   WeakRefDirective = 0;
  61   WeakDefDirective = 0;
  62   // FIXME: These are ELFish - move to ELFMAI.
  63   HiddenDirective = "\t.hidden\t";
  64   ProtectedDirective = "\t.protected\t";
  65   AbsoluteDebugSectionOffsets = false;
  66   AbsoluteEHSectionOffsets = false;
  67   HasLEB128 = false;
  68   HasDotLocAndDotFile = false;
  69   SupportsDebugInformation = false;
  70   ExceptionsType = ExceptionHandling::None;
  71   DwarfRequiresFrameSection = true;
  72   DwarfUsesInlineInfoSection = false;
  73   Is_EHSymbolPrivate = true;
  74   GlobalEHDirective = 0;
  75   SupportsWeakOmittedEHFrame = true;
  76   DwarfSectionOffsetDirective = 0;
  77
  78   AsmTransCBE = 0;
  79 }
  80
  81 MCAsmInfo::~MCAsmInfo() {
  82 }
  83
  84
  85 unsigned MCAsmInfo::getULEB128Size(unsigned Value) {
  86   unsigned Size = 0;
  87   do {
  88     Value >>= 7;
  89     Size += sizeof(int8_t);
  90   } while (Value);
  91   return Size;
  92 }
  93
  94 unsigned MCAsmInfo::getSLEB128Size(int Value) {
  95   unsigned Size = 0;
  96   int Sign = Value >> (8 * sizeof(Value) - 1);
  97   bool IsMore;
  98
  99   do {
 100     unsigned Byte = Value & 0x7f;
 101     Value >>= 7;
 102     IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
 103     Size += sizeof(int8_t);
 104   } while (IsMore);
 105   return Size;
 106 }