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 "X86Subtarget.h"
  17 #include "llvm/DerivedTypes.h"
  18 #include "llvm/InlineAsm.h"
  19 #include "llvm/Instructions.h"
  20 #include "llvm/Intrinsics.h"
  21 #include "llvm/Module.h"
  22 #include "llvm/ADT/StringExtras.h"
  23 #include "llvm/Support/Dwarf.h"
  24 #include "llvm/Support/ErrorHandling.h"
  25
  26 using namespace llvm;
  27 using namespace llvm::dwarf;
  28
  29 const char *const llvm::x86_asm_table[] = {
  30   "{si}", "S",
  31   "{di}", "D",
  32   "{ax}", "a",
  33   "{cx}", "c",
  34   "{memory}", "memory",
  35   "{flags}", "",
  36   "{dirflag}", "",
  37   "{fpsr}", "",
  38   "{cc}", "cc",
  39   0,0};
  40
  41 X86DarwinTargetAsmInfo::X86DarwinTargetAsmInfo(const X86TargetMachine &TM):
  42   X86TargetAsmInfo<DarwinTargetAsmInfo>(TM) {
  43   const X86Subtarget *Subtarget = &TM.getSubtarget<X86Subtarget>();
  44   bool is64Bit = Subtarget->is64Bit();
  45
  46   AlignmentIsInBytes = false;
  47   TextAlignFillValue = 0x90;
  48
  49
  50   if (!is64Bit)
  51     Data64bitsDirective = 0;       // we can't emit a 64-bit unit
  52   ZeroDirective = "\t.space\t";  // ".space N" emits N zeros.
  53   ZeroFillDirective = "\t.zerofill\t";  // Uses .zerofill
  54   if (TM.getRelocationModel() != Reloc::Static)
  55     ConstantPoolSection = "\t.const_data";
  56   else
  57     ConstantPoolSection = "\t.const\n";
  58   LCOMMDirective = "\t.lcomm\t";
  59
  60   // Leopard and above support aligned common symbols.
  61   COMMDirectiveTakesAlignment = (Subtarget->getDarwinVers() >= 9);
  62   HasDotTypeDotSizeDirective = false;
  63
  64   if (is64Bit) {
  65     PersonalityPrefix = "";
  66     PersonalitySuffix = "+4@GOTPCREL";
  67   } else {
  68     PersonalityPrefix = "L";
  69     PersonalitySuffix = "$non_lazy_ptr";
  70   }
  71
  72   InlineAsmStart = "## InlineAsm Start";
  73   InlineAsmEnd = "## InlineAsm End";
  74   CommentString = "##";
  75   SetDirective = "\t.set";
  76   PCSymbol = ".";
  77   UsedDirective = "\t.no_dead_strip\t";
  78   ProtectedDirective = "\t.globl\t";
  79
  80   SupportsDebugInformation = true;
  81   DwarfDebugInlineSection = ".section __DWARF,__debug_inlined,regular,debug";
  82   DwarfUsesInlineInfoSection = true;
  83
  84   // Exceptions handling
  85   SupportsExceptionHandling = true;
  86   GlobalEHDirective = "\t.globl\t";
  87   SupportsWeakOmittedEHFrame = false;
  88   AbsoluteEHSectionOffsets = false;
  89   DwarfEHFrameSection =
  90   ".section __TEXT,__eh_frame,coalesced,no_toc+strip_static_syms+live_support";
  91   DwarfExceptionSection = ".section __DATA,__gcc_except_tab";
  92 }
  93
  94 unsigned
  95 X86DarwinTargetAsmInfo::PreferredEHDataFormat(DwarfEncoding::Target Reason,
  96                                               bool Global) const {
  97   const X86Subtarget *Subtarget = &TM.getSubtarget<X86Subtarget>();
  98
  99   if (Subtarget->getDarwinVers() > 9) {
 100     if ((Reason == DwarfEncoding::Data || Reason == DwarfEncoding::Functions)
 101         && Global)
 102       return DW_EH_PE_pcrel | DW_EH_PE_indirect | DW_EH_PE_sdata4;
 103
 104     if (Reason == DwarfEncoding::CodeLabels || !Global)
 105       return DW_EH_PE_pcrel;
 106   }
 107
 108   return DW_EH_PE_absptr;
 109 }
 110
 111 const char *
 112 X86DarwinTargetAsmInfo::getEHGlobalPrefix() const {
 113   const X86Subtarget* Subtarget = &TM.getSubtarget<X86Subtarget>();
 114   if (Subtarget->getDarwinVers() > 9)
 115     return PrivateGlobalPrefix;
 116   return "";
 117 }
 118
 119 X86ELFTargetAsmInfo::X86ELFTargetAsmInfo(const X86TargetMachine &TM) :
 120   X86TargetAsmInfo<ELFTargetAsmInfo>(TM) {
 121
 122   CStringSection = ".rodata.str";
 123   PrivateGlobalPrefix = ".L";
 124   WeakRefDirective = "\t.weak\t";
 125   SetDirective = "\t.set\t";
 126   PCSymbol = ".";
 127
 128   // Set up DWARF directives
 129   HasLEB128 = true;  // Target asm supports leb128 directives (little-endian)
 130
 131   // Debug Information
 132   AbsoluteDebugSectionOffsets = true;
 133   SupportsDebugInformation = true;
 134   DwarfAbbrevSection =  "\t.section\t.debug_abbrev,\"\",@progbits";
 135   DwarfInfoSection =    "\t.section\t.debug_info,\"\",@progbits";
 136   DwarfLineSection =    "\t.section\t.debug_line,\"\",@progbits";
 137   DwarfFrameSection =   "\t.section\t.debug_frame,\"\",@progbits";
 138   DwarfPubNamesSection ="\t.section\t.debug_pubnames,\"\",@progbits";
 139   DwarfPubTypesSection ="\t.section\t.debug_pubtypes,\"\",@progbits";
 140   DwarfStrSection =     "\t.section\t.debug_str,\"\",@progbits";
 141   DwarfLocSection =     "\t.section\t.debug_loc,\"\",@progbits";
 142   DwarfARangesSection = "\t.section\t.debug_aranges,\"\",@progbits";
 143   DwarfRangesSection =  "\t.section\t.debug_ranges,\"\",@progbits";
 144   DwarfMacroInfoSection = "\t.section\t.debug_macinfo,\"\",@progbits";
 145
 146   // Exceptions handling
 147   SupportsExceptionHandling = true;
 148   AbsoluteEHSectionOffsets = false;
 149   DwarfEHFrameSection = "\t.section\t.eh_frame,\"aw\",@progbits";
 150   DwarfExceptionSection = "\t.section\t.gcc_except_table,\"a\",@progbits";
 151
 152   // On Linux we must declare when we can use a non-executable stack.
 153   if (TM.getSubtarget<X86Subtarget>().isLinux())
 154     NonexecutableStackDirective = "\t.section\t.note.GNU-stack,\"\",@progbits";
 155 }
 156
 157 unsigned
 158 X86ELFTargetAsmInfo::PreferredEHDataFormat(DwarfEncoding::Target Reason,
 159                                            bool Global) const {
 160   CodeModel::Model CM = TM.getCodeModel();
 161   bool is64Bit = TM.getSubtarget<X86Subtarget>().is64Bit();
 162
 163   if (TM.getRelocationModel() == Reloc::PIC_) {
 164     unsigned Format = 0;
 165
 166     if (!is64Bit)
 167       // 32 bit targets always encode pointers as 4 bytes
 168       Format = DW_EH_PE_sdata4;
 169     else {
 170       // 64 bit targets encode pointers in 4 bytes iff:
 171       // - code model is small OR
 172       // - code model is medium and we're emitting externally visible symbols
 173       //   or any code symbols
 174       if (CM == CodeModel::Small ||
 175           (CM == CodeModel::Medium && (Global ||
 176                                        Reason != DwarfEncoding::Data)))
 177         Format = DW_EH_PE_sdata4;
 178       else
 179         Format = DW_EH_PE_sdata8;
 180     }
 181
 182     if (Global)
 183       Format |= DW_EH_PE_indirect;
 184
 185     return (Format | DW_EH_PE_pcrel);
 186   } else {
 187     if (is64Bit &&
 188         (CM == CodeModel::Small ||
 189          (CM == CodeModel::Medium && Reason != DwarfEncoding::Data)))
 190       return DW_EH_PE_udata4;
 191     else
 192       return DW_EH_PE_absptr;
 193   }
 194 }
 195
 196
 197 unsigned
 198 X86COFFTargetAsmInfo::PreferredEHDataFormat(DwarfEncoding::Target Reason,
 199                                             bool Global) const {
 200   CodeModel::Model CM = TM.getCodeModel();
 201   bool is64Bit = TM.getSubtarget<X86Subtarget>().is64Bit();
 202
 203   if (TM.getRelocationModel() == Reloc::PIC_) {
 204     unsigned Format = 0;
 205
 206     if (!is64Bit)
 207       // 32 bit targets always encode pointers as 4 bytes
 208       Format = DW_EH_PE_sdata4;
 209     else {
 210       // 64 bit targets encode pointers in 4 bytes iff:
 211       // - code model is small OR
 212       // - code model is medium and we're emitting externally visible symbols
 213       //   or any code symbols
 214       if (CM == CodeModel::Small ||
 215           (CM == CodeModel::Medium && (Global ||
 216                                        Reason != DwarfEncoding::Data)))
 217         Format = DW_EH_PE_sdata4;
 218       else
 219         Format = DW_EH_PE_sdata8;
 220     }
 221
 222     if (Global)
 223       Format |= DW_EH_PE_indirect;
 224
 225     return (Format | DW_EH_PE_pcrel);
 226   }
 227
 228   if (is64Bit &&
 229       (CM == CodeModel::Small ||
 230        (CM == CodeModel::Medium && Reason != DwarfEncoding::Data)))
 231     return DW_EH_PE_udata4;
 232   return DW_EH_PE_absptr;
 233 }
 234
 235
 236
 237 X86WinTargetAsmInfo::X86WinTargetAsmInfo(const X86TargetMachine &TM):
 238   X86TargetAsmInfo<TargetAsmInfo>(TM) {
 239   GlobalPrefix = "_";
 240   CommentString = ";";
 241
 242   InlineAsmStart = "; InlineAsm Start";
 243   InlineAsmEnd   = "; InlineAsm End";
 244
 245   PrivateGlobalPrefix = "$";
 246   AlignDirective = "\tALIGN\t";
 247   ZeroDirective = "\tdb\t";
 248   ZeroDirectiveSuffix = " dup(0)";
 249   AsciiDirective = "\tdb\t";
 250   AscizDirective = 0;
 251   Data8bitsDirective = "\tdb\t";
 252   Data16bitsDirective = "\tdw\t";
 253   Data32bitsDirective = "\tdd\t";
 254   Data64bitsDirective = "\tdq\t";
 255   HasDotTypeDotSizeDirective = false;
 256   HasSingleParameterDotFile = false;
 257
 258   AlignmentIsInBytes = true;
 259
 260   JumpTableDataSection = NULL;
 261   SwitchToSectionDirective = "";
 262   TextSectionStartSuffix = "\tSEGMENT PARA 'CODE'";
 263   DataSectionStartSuffix = "\tSEGMENT PARA 'DATA'";
 264   SectionEndDirectiveSuffix = "\tends\n";
 265 }
 266
 267 // Instantiate default implementation.
 268 TEMPLATE_INSTANTIATION(class X86TargetAsmInfo<TargetAsmInfo>);