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annotate lib/Target/Hexagon/HexagonTargetObjectFile.cpp @ 0:95c75e76d11b LLVM3.4

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
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children 54457678186b
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1 //===-- HexagonTargetObjectFile.cpp - Hexagon asm properties --------------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file contains the declarations of the HexagonTargetAsmInfo properties.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "HexagonTargetObjectFile.h"
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15 #include "HexagonSubtarget.h"
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16 #include "HexagonTargetMachine.h"
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17 #include "llvm/IR/DataLayout.h"
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18 #include "llvm/IR/DerivedTypes.h"
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19 #include "llvm/IR/Function.h"
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20 #include "llvm/IR/GlobalVariable.h"
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21 #include "llvm/MC/MCContext.h"
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22 #include "llvm/Support/CommandLine.h"
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23 #include "llvm/Support/ELF.h"
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24
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25 using namespace llvm;
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26
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27 static cl::opt<int> SmallDataThreshold("hexagon-small-data-threshold",
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28 cl::init(8), cl::Hidden,
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29 cl::desc("The maximum size of an object in the sdata section"));
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30
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31 void HexagonTargetObjectFile::Initialize(MCContext &Ctx,
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32 const TargetMachine &TM) {
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33 TargetLoweringObjectFileELF::Initialize(Ctx, TM);
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34
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35
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36 SmallDataSection =
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37 getContext().getELFSection(".sdata", ELF::SHT_PROGBITS,
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38 ELF::SHF_WRITE | ELF::SHF_ALLOC,
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39 SectionKind::getDataRel());
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40 SmallBSSSection =
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41 getContext().getELFSection(".sbss", ELF::SHT_NOBITS,
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42 ELF::SHF_WRITE | ELF::SHF_ALLOC,
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43 SectionKind::getBSS());
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44 }
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45
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46 // sdata/sbss support taken largely from the MIPS Backend.
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47 static bool IsInSmallSection(uint64_t Size) {
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48 return Size > 0 && Size <= (uint64_t)SmallDataThreshold;
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49 }
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50
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51 bool HexagonTargetObjectFile::IsSmallDataEnabled () const {
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52 return SmallDataThreshold > 0;
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53 }
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54
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55 /// IsGlobalInSmallSection - Return true if this global value should be
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56 /// placed into small data/bss section.
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57 bool HexagonTargetObjectFile::IsGlobalInSmallSection(const GlobalValue *GV,
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58 const TargetMachine &TM) const {
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59 // If the primary definition of this global value is outside the current
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60 // translation unit or the global value is available for inspection but not
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61 // emission, then do nothing.
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62 if (GV->isDeclaration() || GV->hasAvailableExternallyLinkage())
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63 return false;
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64
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65 // Otherwise, Check if GV should be in sdata/sbss, when normally it would end
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66 // up in getKindForGlobal(GV, TM).
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67 return IsGlobalInSmallSection(GV, TM, getKindForGlobal(GV, TM));
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68 }
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69
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70 /// IsGlobalInSmallSection - Return true if this global value should be
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71 /// placed into small data/bss section.
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72 bool HexagonTargetObjectFile::
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73 IsGlobalInSmallSection(const GlobalValue *GV, const TargetMachine &TM,
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74 SectionKind Kind) const {
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75 // Only global variables, not functions.
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76 const GlobalVariable *GVA = dyn_cast<GlobalVariable>(GV);
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77 if (!GVA)
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78 return false;
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79
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80 if (Kind.isBSS() || Kind.isDataNoRel() || Kind.isCommon()) {
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81 Type *Ty = GV->getType()->getElementType();
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82 return IsInSmallSection(TM.getDataLayout()->getTypeAllocSize(Ty));
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83 }
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84
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85 return false;
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86 }
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87
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88 const MCSection *HexagonTargetObjectFile::
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89 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
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90 Mangler *Mang, const TargetMachine &TM) const {
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91
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92 // Handle Small Section classification here.
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93 if (Kind.isBSS() && IsGlobalInSmallSection(GV, TM, Kind))
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94 return SmallBSSSection;
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95 if (Kind.isDataNoRel() && IsGlobalInSmallSection(GV, TM, Kind))
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96 return SmallDataSection;
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97
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98 // Otherwise, we work the same as ELF.
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99 return TargetLoweringObjectFileELF::SelectSectionForGlobal(GV, Kind, Mang,TM);
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100 }