lib/Target/XCore/XCoreTargetAsmInfo.cpp

   1 //===-- XCoreTargetAsmInfo.cpp - XCore 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 XCoreTargetAsmInfo properties.
  11 // We use the small section flag for the CP relative and DP relative
  12 // flags. If a section is small and writable then it is DP relative. If a
  13 // section is small and not writable then it is CP relative.
  14 //
  15 //===----------------------------------------------------------------------===//
  16
  17 #include "XCoreTargetAsmInfo.h"
  18 #include "XCoreTargetMachine.h"
  19 #include "llvm/GlobalVariable.h"
  20 #include "llvm/ADT/StringExtras.h"
  21
  22 using namespace llvm;
  23
  24 XCoreTargetAsmInfo::XCoreTargetAsmInfo(const XCoreTargetMachine &TM)
  25   : ELFTargetAsmInfo(TM),
  26     Subtarget(TM.getSubtargetImpl()) {
  27   TextSection = getUnnamedSection("\t.text", SectionFlags::Code);
  28   DataSection = getNamedSection("\t.dp.data", SectionFlags::Writeable |
  29                                 SectionFlags::Small);
  30   BSSSection_  = getNamedSection("\t.dp.bss", SectionFlags::Writeable |
  31                                  SectionFlags::BSS | SectionFlags::Small);
  32   if (Subtarget->isXS1A()) {
  33     ReadOnlySection = getNamedSection("\t.dp.rodata", SectionFlags::None |
  34                                       SectionFlags::Writeable |
  35                                       SectionFlags::Small);
  36   } else {
  37     ReadOnlySection = getNamedSection("\t.cp.rodata", SectionFlags::None |
  38                                       SectionFlags::Small);
  39   }
  40   Data16bitsDirective = "\t.short\t";
  41   Data32bitsDirective = "\t.long\t";
  42   Data64bitsDirective = 0;
  43   ZeroDirective = "\t.space\t";
  44   CommentString = "#";
  45   ConstantPoolSection = "\t.section\t.cp.rodata,\"ac\",@progbits";
  46   JumpTableDataSection = "\t.section\t.dp.data,\"awd\",@progbits";
  47   PrivateGlobalPrefix = ".L";
  48   AscizDirective = ".asciiz";
  49   WeakDefDirective = "\t.weak\t";
  50   WeakRefDirective = "\t.weak\t";
  51   SetDirective = "\t.set\t";
  52
  53   // Debug
  54   HasLEB128 = true;
  55   AbsoluteDebugSectionOffsets = true;
  56
  57   DwarfAbbrevSection = "\t.section\t.debug_abbrev,\"\",@progbits";
  58   DwarfInfoSection = "\t.section\t.debug_info,\"\",@progbits";
  59   DwarfLineSection = "\t.section\t.debug_line,\"\",@progbits";
  60   DwarfFrameSection = "\t.section\t.debug_frame,\"\",@progbits";
  61   DwarfPubNamesSection = "\t.section\t.debug_pubnames,\"\",@progbits";
  62   DwarfPubTypesSection = "\t.section\t.debug_pubtypes,\"\",@progbits";
  63   DwarfStrSection = "\t.section\t.debug_str,\"\",@progbits";
  64   DwarfLocSection = "\t.section\t.debug_loc,\"\",@progbits";
  65   DwarfARangesSection = "\t.section\t.debug_aranges,\"\",@progbits";
  66   DwarfRangesSection = "\t.section\t.debug_ranges,\"\",@progbits";
  67   DwarfMacInfoSection = "\t.section\t.debug_macinfo,\"\",@progbits";
  68 }
  69
  70 const Section*
  71 XCoreTargetAsmInfo::SelectSectionForGlobal(const GlobalValue *GV) const {
  72   SectionKind::Kind Kind = SectionKindForGlobal(GV);
  73
  74   if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV))
  75   {
  76     if (!GVar->isWeakForLinker()) {
  77       switch (Kind) {
  78       case SectionKind::RODataMergeStr:
  79         return MergeableStringSection(GVar);
  80       case SectionKind::RODataMergeConst:
  81         return getReadOnlySection();
  82       case SectionKind::ThreadData:
  83         return DataSection;
  84       case SectionKind::ThreadBSS:
  85         return getBSSSection_();
  86       default:
  87         break;
  88       }
  89     }
  90   }
  91   return ELFTargetAsmInfo::SelectSectionForGlobal(GV);
  92 }
  93
  94 const Section*
  95 XCoreTargetAsmInfo::SelectSectionForMachineConst(const Type *Ty) const {
  96   return MergeableConstSection(Ty);
  97 }
  98
  99 const Section*
 100 XCoreTargetAsmInfo::MergeableConstSection(const GlobalVariable *GV) const {
 101   Constant *C = GV->getInitializer();
 102   return MergeableConstSection(C->getType());
 103 }
 104
 105 inline const Section*
 106 XCoreTargetAsmInfo::MergeableConstSection(const Type *Ty) const {
 107   const TargetData *TD = TM.getTargetData();
 108
 109   unsigned Size = TD->getTypeAllocSize(Ty);
 110   if (Size == 4 || Size == 8 || Size == 16) {
 111     std::string Name =  ".cp.const" + utostr(Size);
 112
 113     return getNamedSection(Name.c_str(),
 114                            SectionFlags::setEntitySize(SectionFlags::Mergeable |
 115                                                        SectionFlags::Small,
 116                                                        Size));
 117   }
 118
 119   return getReadOnlySection();
 120 }
 121
 122 const Section* XCoreTargetAsmInfo::
 123 MergeableStringSection(const GlobalVariable *GV) const {
 124   // FIXME insert in correct mergable section
 125   return getReadOnlySection();
 126 }
 127
 128 unsigned XCoreTargetAsmInfo::
 129 SectionFlagsForGlobal(const GlobalValue *GV,
 130                                      const char* Name) const {
 131   unsigned Flags = ELFTargetAsmInfo::SectionFlagsForGlobal(GV, Name);
 132   // Mask out unsupported flags
 133   Flags &= ~(SectionFlags::Small | SectionFlags::TLS);
 134
 135   // Set CP / DP relative flags
 136   if (GV) {
 137     SectionKind::Kind Kind = SectionKindForGlobal(GV);
 138     switch (Kind) {
 139     case SectionKind::ThreadData:
 140     case SectionKind::ThreadBSS:
 141     case SectionKind::Data:
 142     case SectionKind::BSS:
 143     case SectionKind::SmallData:
 144     case SectionKind::SmallBSS:
 145       Flags |= SectionFlags::Small;
 146       break;
 147     case SectionKind::ROData:
 148     case SectionKind::RODataMergeStr:
 149     case SectionKind::SmallROData:
 150       if (Subtarget->isXS1A()) {
 151         Flags |= SectionFlags::Writeable;
 152       }
 153       Flags |=SectionFlags::Small;
 154       break;
 155     case SectionKind::RODataMergeConst:
 156       Flags |=SectionFlags::Small;
 157     default:
 158       break;
 159     }
 160   }
 161
 162   return Flags;
 163 }
 164
 165 std::string XCoreTargetAsmInfo::
 166 printSectionFlags(unsigned flags) const {
 167   std::string Flags = ",\"";
 168
 169   if (!(flags & SectionFlags::Debug))
 170     Flags += 'a';
 171   if (flags & SectionFlags::Code)
 172     Flags += 'x';
 173   if (flags & SectionFlags::Writeable)
 174     Flags += 'w';
 175   if (flags & SectionFlags::Mergeable)
 176     Flags += 'M';
 177   if (flags & SectionFlags::Strings)
 178     Flags += 'S';
 179   if (flags & SectionFlags::TLS)
 180     Flags += 'T';
 181   if (flags & SectionFlags::Small) {
 182     if (flags & SectionFlags::Writeable)
 183       Flags += 'd'; // DP relative
 184     else
 185       Flags += 'c'; // CP relative
 186   }
 187
 188   Flags += "\",";
 189
 190   Flags += '@';
 191
 192   if (flags & SectionFlags::BSS)
 193     Flags += "nobits";
 194   else
 195     Flags += "progbits";
 196
 197   if (unsigned entitySize = SectionFlags::getEntitySize(flags))
 198     Flags += "," + utostr(entitySize);
 199
 200   return Flags;
 201 }