lib/Target/X86/X86MCAsmInfo.cpp

   1 //===-- X86MCAsmInfo.cpp - X86 asm properties -----------------------------===//
   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 contains the declarations of the X86MCAsmInfo properties.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "X86MCAsmInfo.h"
  15 #include "X86TargetMachine.h"
  16 #include "llvm/ADT/Triple.h"
  17 #include "llvm/Support/CommandLine.h"
  18 using namespace llvm;
  19
  20 enum AsmWriterFlavorTy {
  21   // Note: This numbering has to match the GCC assembler dialects for inline
  22   // asm alternatives to work right.
  23   ATT = 0, Intel = 1
  24 };
  25
  26 static cl::opt<AsmWriterFlavorTy>
  27 AsmWriterFlavor("x86-asm-syntax", cl::init(ATT),
  28   cl::desc("Choose style of code to emit from X86 backend:"),
  29   cl::values(clEnumValN(ATT,   "att",   "Emit AT&T-style assembly"),
  30              clEnumValN(Intel, "intel", "Emit Intel-style assembly"),
  31              clEnumValEnd));
  32
  33
  34 static const char *const x86_asm_table[] = {
  35   "{si}", "S",
  36   "{di}", "D",
  37   "{ax}", "a",
  38   "{cx}", "c",
  39   "{memory}", "memory",
  40   "{flags}", "",
  41   "{dirflag}", "",
  42   "{fpsr}", "",
  43   "{cc}", "cc",
  44   0,0};
  45
  46 X86MCAsmInfoDarwin::X86MCAsmInfoDarwin(const Triple &Triple) {
  47   AsmTransCBE = x86_asm_table;
  48   AssemblerDialect = AsmWriterFlavor;
  49
  50   bool is64Bit = Triple.getArch() == Triple::x86_64;
  51
  52   TextAlignFillValue = 0x90;
  53
  54   if (!is64Bit)
  55     Data64bitsDirective = 0;       // we can't emit a 64-bit unit
  56
  57   // Leopard and above support aligned common symbols.
  58   COMMDirectiveTakesAlignment = Triple.getDarwinMajorNumber() >= 9;
  59
  60   CommentString = "##";
  61   PCSymbol = ".";
  62
  63   SupportsDebugInformation = true;
  64   DwarfUsesInlineInfoSection = true;
  65
  66   // Exceptions handling
  67   ExceptionsType = ExceptionHandling::Dwarf;
  68   AbsoluteEHSectionOffsets = false;
  69 }
  70
  71 X86ELFMCAsmInfo::X86ELFMCAsmInfo(const Triple &Triple) {
  72   AsmTransCBE = x86_asm_table;
  73   AssemblerDialect = AsmWriterFlavor;
  74
  75   PrivateGlobalPrefix = ".L";
  76   WeakRefDirective = "\t.weak\t";
  77   SetDirective = "\t.set\t";
  78   PCSymbol = ".";
  79
  80   // Set up DWARF directives
  81   HasLEB128 = true;  // Target asm supports leb128 directives (little-endian)
  82
  83   // Debug Information
  84   AbsoluteDebugSectionOffsets = true;
  85   SupportsDebugInformation = true;
  86
  87   // Exceptions handling
  88   ExceptionsType = ExceptionHandling::Dwarf;
  89   AbsoluteEHSectionOffsets = false;
  90
  91   // On Linux we must declare when we can use a non-executable stack.
  92   if (Triple.getOS() == Triple::Linux)
  93     NonexecutableStackDirective = "\t.section\t.note.GNU-stack,\"\",@progbits";
  94 }
  95
  96 X86MCAsmInfoCOFF::X86MCAsmInfoCOFF(const Triple &Triple) {
  97   AsmTransCBE = x86_asm_table;
  98   AssemblerDialect = AsmWriterFlavor;
  99 }
 100
 101
 102 X86WinMCAsmInfo::X86WinMCAsmInfo(const Triple &Triple) {
 103   AsmTransCBE = x86_asm_table;
 104   AssemblerDialect = AsmWriterFlavor;
 105
 106   GlobalPrefix = "_";
 107   CommentString = ";";
 108
 109   PrivateGlobalPrefix = "$";
 110   AlignDirective = "\tALIGN\t";
 111   ZeroDirective = "\tdb\t";
 112   ZeroDirectiveSuffix = " dup(0)";
 113   AsciiDirective = "\tdb\t";
 114   AscizDirective = 0;
 115   Data8bitsDirective = "\tdb\t";
 116   Data16bitsDirective = "\tdw\t";
 117   Data32bitsDirective = "\tdd\t";
 118   Data64bitsDirective = "\tdq\t";
 119   HasDotTypeDotSizeDirective = false;
 120   HasSingleParameterDotFile = false;
 121
 122   AlignmentIsInBytes = true;
 123 }