lib/Target/Mips/MipsTargetAsmInfo.cpp

   1 //===-- MipsTargetAsmInfo.cpp - Mips 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 MipsTargetAsmInfo properties.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "MipsTargetAsmInfo.h"
  15 #include "MipsTargetMachine.h"
  16
  17 using namespace llvm;
  18
  19 MipsTargetAsmInfo::MipsTargetAsmInfo(const MipsTargetMachine &TM):
  20   ELFTargetAsmInfo(TM) {
  21
  22   MipsTM = &TM;
  23
  24   AlignmentIsInBytes          = false;
  25   COMMDirectiveTakesAlignment = true;
  26   Data16bitsDirective         = "\t.half\t";
  27   Data32bitsDirective         = "\t.word\t";
  28   Data64bitsDirective         = NULL;
  29   PrivateGlobalPrefix         = "$";
  30   JumpTableDataSection        = "\t.rdata";
  31   CommentString               = "#";
  32   ReadOnlySection             = "\t.rdata";
  33   ZeroDirective               = "\t.space\t";
  34   BSSSection                  = "\t.section\t.bss";
  35   LCOMMDirective              = "\t.lcomm\t";
  36   CStringSection              = ".rodata.str";
  37
  38   if (!TM.getSubtarget<MipsSubtarget>().hasABICall())
  39     JumpTableDirective = "\t.word\t";
  40   else
  41     JumpTableDirective = "\t.gpword\t";
  42
  43   SmallDataSection = getNamedSection("\t.sdata", SectionFlags::Writeable);
  44   SmallBSSSection  = getNamedSection("\t.sbss",
  45                          SectionFlags::Writeable | SectionFlags::BSS);
  46 }
  47
  48 SectionKind::Kind
  49 MipsTargetAsmInfo::SectionKindForGlobal(const GlobalValue *GV) const {
  50   SectionKind::Kind K = ELFTargetAsmInfo::SectionKindForGlobal(GV);
  51
  52   if (K != SectionKind::Data && K != SectionKind::BSS &&
  53       K != SectionKind::RODataMergeConst)
  54     return K;
  55
  56   if (isa<GlobalVariable>(GV)) {
  57     const TargetData *TD = ETM->getTargetData();
  58     unsigned Size = TD->getABITypeSize(GV->getType()->getElementType());
  59     unsigned Threshold =
  60       MipsTM->getSubtarget<MipsSubtarget>().getSSectionThreshold();
  61
  62     if (Size > 0 && Size <= Threshold) {
  63       if (K == SectionKind::BSS)
  64         return SectionKind::SmallBSS;
  65       else
  66         return SectionKind::SmallData;
  67     }
  68   }
  69
  70   return K;
  71 }
  72
  73 const Section*
  74 MipsTargetAsmInfo::SelectSectionForGlobal(const GlobalValue *GV) const {
  75   SectionKind::Kind K = SectionKindForGlobal(GV);
  76   const GlobalVariable *GVA = dyn_cast<GlobalVariable>(GV);
  77
  78   if (GVA && (!GVA->isWeakForLinker()))
  79     switch (K) {
  80       case SectionKind::SmallData:
  81         return getSmallDataSection();
  82       case SectionKind::SmallBSS:
  83         return getSmallBSSSection();
  84       default: break;
  85     }
  86
  87   return ELFTargetAsmInfo::SelectSectionForGlobal(GV);
  88 }