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   JumpTableSpecialLabelPrefix = 0;
  34   GlobalVarAddrPrefix = "";
  35   GlobalVarAddrSuffix = "";
  36   FunctionAddrPrefix = "";
  37   FunctionAddrSuffix = "";
  38   PersonalityPrefix = "";
  39   PersonalitySuffix = "";
  40   NeedsIndirectEncoding = false;
  41   InlineAsmStart = "APP";
  42   InlineAsmEnd = "NO_APP";
  43   AssemblerDialect = 0;
  44   AllowQuotesInName = false;
  45   ZeroDirective = "\t.zero\t";
  46   ZeroDirectiveSuffix = 0;
  47   AsciiDirective = "\t.ascii\t";
  48   AscizDirective = "\t.asciz\t";
  49   Data8bitsDirective = "\t.byte\t";
  50   Data16bitsDirective = "\t.short\t";
  51   Data32bitsDirective = "\t.long\t";
  52   Data64bitsDirective = "\t.quad\t";
  53   SunStyleELFSectionSwitchSyntax = false;
  54   UsesELFSectionDirectiveForBSS = false;
  55   AlignDirective = "\t.align\t";
  56   AlignmentIsInBytes = true;
  57   TextAlignFillValue = 0;
  58   JumpTableDirective = 0;
  59   PICJumpTableDirective = 0;
  60   GlobalDirective = "\t.globl\t";
  61   SetDirective = 0;
  62   LCOMMDirective = 0;
  63   COMMDirective = "\t.comm\t";
  64   COMMDirectiveTakesAlignment = true;
  65   HasDotTypeDotSizeDirective = true;
  66   HasSingleParameterDotFile = true;
  67   UsedDirective = 0;
  68   WeakRefDirective = 0;
  69   WeakDefDirective = 0;
  70   // FIXME: These are ELFish - move to ELFMAI.
  71   HiddenDirective = "\t.hidden\t";
  72   ProtectedDirective = "\t.protected\t";
  73   AbsoluteDebugSectionOffsets = false;
  74   AbsoluteEHSectionOffsets = false;
  75   HasLEB128 = false;
  76   HasDotLocAndDotFile = false;
  77   SupportsDebugInformation = false;
  78   ExceptionsType = ExceptionHandling::None;
  79   DwarfRequiresFrameSection = true;
  80   DwarfUsesInlineInfoSection = false;
  81   Is_EHSymbolPrivate = true;
  82   GlobalEHDirective = 0;
  83   SupportsWeakOmittedEHFrame = true;
  84   DwarfSectionOffsetDirective = 0;
  85
  86   AsmTransCBE = 0;
  87 }
  88
  89 MCAsmInfo::~MCAsmInfo() {
  90 }
  91
  92
  93 unsigned MCAsmInfo::getULEB128Size(unsigned Value) {
  94   unsigned Size = 0;
  95   do {
  96     Value >>= 7;
  97     Size += sizeof(int8_t);
  98   } while (Value);
  99   return Size;
 100 }
 101
 102 unsigned MCAsmInfo::getSLEB128Size(int Value) {
 103   unsigned Size = 0;
 104   int Sign = Value >> (8 * sizeof(Value) - 1);
 105   bool IsMore;
 106
 107   do {
 108     unsigned Byte = Value & 0x7f;
 109     Value >>= 7;
 110     IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
 111     Size += sizeof(int8_t);
 112   } while (IsMore);
 113   return Size;
 114 }