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 #include "llvm/GlobalVariable.h"
  17
  18 using namespace llvm;
  19
  20 MipsTargetAsmInfo::MipsTargetAsmInfo(const MipsTargetMachine &TM):
  21   ELFTargetAsmInfo(TM) {
  22
  23   Subtarget = &TM.getSubtarget<MipsSubtarget>();
  24
  25   AlignmentIsInBytes          = false;
  26   COMMDirectiveTakesAlignment = true;
  27   Data16bitsDirective         = "\t.half\t";
  28   Data32bitsDirective         = "\t.word\t";
  29   Data64bitsDirective         = NULL;
  30   PrivateGlobalPrefix         = "$";
  31   JumpTableDataSection        = "\t.rdata";
  32   CommentString               = "#";
  33   ZeroDirective               = "\t.space\t";
  34   BSSSection                  = "\t.section\t.bss";
  35   CStringSection              = ".rodata.str";
  36
  37   if (!Subtarget->hasABICall()) {
  38     JumpTableDirective = "\t.word\t";
  39     SmallDataSection = getNamedSection("\t.sdata", SectionFlags::Writeable);
  40     SmallBSSSection = getNamedSection("\t.sbss",
  41                                       SectionFlags::Writeable |
  42                                       SectionFlags::BSS);
  43   } else
  44     JumpTableDirective = "\t.gpword\t";
  45
  46 }
  47
  48 unsigned MipsTargetAsmInfo::
  49 SectionFlagsForGlobal(const GlobalValue *GV, const char* Name) const {
  50   unsigned Flags = ELFTargetAsmInfo::SectionFlagsForGlobal(GV, Name);
  51   // Mask out Small Section flag bit, Mips doesnt support 's' section symbol
  52   // for its small sections.
  53   return (Flags & (~SectionFlags::Small));
  54 }
  55
  56 SectionKind::Kind MipsTargetAsmInfo::
  57 SectionKindForGlobal(const GlobalValue *GV) const {
  58   SectionKind::Kind K = ELFTargetAsmInfo::SectionKindForGlobal(GV);
  59
  60   if (Subtarget->hasABICall())
  61     return K;
  62
  63   if (K != SectionKind::Data && K != SectionKind::BSS &&
  64       K != SectionKind::RODataMergeConst)
  65     return K;
  66
  67   if (isa<GlobalVariable>(GV)) {
  68     const TargetData *TD = TM.getTargetData();
  69     unsigned Size = TD->getTypeAllocSize(GV->getType()->getElementType());
  70     unsigned Threshold = Subtarget->getSSectionThreshold();
  71
  72     if (Size > 0 && Size <= Threshold) {
  73       if (K == SectionKind::BSS)
  74         return SectionKind::SmallBSS;
  75       else
  76         return SectionKind::SmallData;
  77     }
  78   }
  79
  80   return K;
  81 }
  82
  83 const Section* MipsTargetAsmInfo::
  84 SelectSectionForGlobal(const GlobalValue *GV) const {
  85   SectionKind::Kind K = SectionKindForGlobal(GV);
  86   const GlobalVariable *GVA = dyn_cast<GlobalVariable>(GV);
  87
  88   if (GVA && (!GVA->isWeakForLinker()))
  89     switch (K) {
  90       case SectionKind::SmallData:
  91         return getSmallDataSection();
  92       case SectionKind::SmallBSS:
  93         return getSmallBSSSection();
  94       default: break;
  95     }
  96
  97   return ELFTargetAsmInfo::SelectSectionForGlobal(GV);
  98 }