lib/Target/X86/X86TargetAsmInfo.cpp

   1 //===-- X86TargetAsmInfo.cpp - X86 asm properties ---------------*- C++ -*-===//
   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 X86TargetAsmInfo properties.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "X86TargetAsmInfo.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 X86DarwinTargetAsmInfo::X86DarwinTargetAsmInfo(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   if (is64Bit) {
  61     PersonalityPrefix = "";
  62     PersonalitySuffix = "+4@GOTPCREL";
  63   } else {
  64     PersonalityPrefix = "L";
  65     PersonalitySuffix = "$non_lazy_ptr";
  66   }
  67
  68   CommentString = "##";
  69   PCSymbol = ".";
  70
  71   SupportsDebugInformation = true;
  72   DwarfUsesInlineInfoSection = true;
  73
  74   // Exceptions handling
  75   ExceptionsType = ExceptionHandling::Dwarf;
  76   AbsoluteEHSectionOffsets = false;
  77 }
  78
  79 X86ELFTargetAsmInfo::X86ELFTargetAsmInfo(const Triple &Triple) {
  80   AsmTransCBE = x86_asm_table;
  81   AssemblerDialect = AsmWriterFlavor;
  82
  83   PrivateGlobalPrefix = ".L";
  84   WeakRefDirective = "\t.weak\t";
  85   SetDirective = "\t.set\t";
  86   PCSymbol = ".";
  87
  88   // Set up DWARF directives
  89   HasLEB128 = true;  // Target asm supports leb128 directives (little-endian)
  90
  91   // Debug Information
  92   AbsoluteDebugSectionOffsets = true;
  93   SupportsDebugInformation = true;
  94
  95   // Exceptions handling
  96   ExceptionsType = ExceptionHandling::Dwarf;
  97   AbsoluteEHSectionOffsets = false;
  98
  99   // On Linux we must declare when we can use a non-executable stack.
 100   if (Triple.getOS() == Triple::Linux)
 101     NonexecutableStackDirective = "\t.section\t.note.GNU-stack,\"\",@progbits";
 102 }
 103
 104 X86COFFTargetAsmInfo::X86COFFTargetAsmInfo(const Triple &Triple) {
 105   AsmTransCBE = x86_asm_table;
 106   AssemblerDialect = AsmWriterFlavor;
 107 }
 108
 109
 110 X86WinTargetAsmInfo::X86WinTargetAsmInfo(const Triple &Triple) {
 111   AsmTransCBE = x86_asm_table;
 112   AssemblerDialect = AsmWriterFlavor;
 113
 114   GlobalPrefix = "_";
 115   CommentString = ";";
 116
 117   PrivateGlobalPrefix = "$";
 118   AlignDirective = "\tALIGN\t";
 119   ZeroDirective = "\tdb\t";
 120   ZeroDirectiveSuffix = " dup(0)";
 121   AsciiDirective = "\tdb\t";
 122   AscizDirective = 0;
 123   Data8bitsDirective = "\tdb\t";
 124   Data16bitsDirective = "\tdw\t";
 125   Data32bitsDirective = "\tdd\t";
 126   Data64bitsDirective = "\tdq\t";
 127   HasDotTypeDotSizeDirective = false;
 128   HasSingleParameterDotFile = false;
 129
 130   AlignmentIsInBytes = true;
 131 }