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annotate lib/Target/TargetLoweringObjectFile.cpp @ 121:803732b1fca8

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LLVM 5.0
author kono
date Fri, 27 Oct 2017 17:07:41 +0900
parents 1172e4bd9c6f
children 3a76565eade5
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1 //===-- llvm/Target/TargetLoweringObjectFile.cpp - Object File Info -------===//
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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 implements classes used to handle lowerings specific to common
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11 // object file formats.
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12 //
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13 //===----------------------------------------------------------------------===//
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14
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15 #include "llvm/Target/TargetLoweringObjectFile.h"
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16 #include "llvm/BinaryFormat/Dwarf.h"
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17 #include "llvm/IR/Constants.h"
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18 #include "llvm/IR/DataLayout.h"
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19 #include "llvm/IR/DerivedTypes.h"
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20 #include "llvm/IR/Function.h"
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21 #include "llvm/IR/GlobalVariable.h"
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22 #include "llvm/IR/Mangler.h"
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23 #include "llvm/MC/MCAsmInfo.h"
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24 #include "llvm/MC/MCContext.h"
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25 #include "llvm/MC/MCExpr.h"
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26 #include "llvm/MC/MCStreamer.h"
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27 #include "llvm/MC/MCSymbol.h"
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28 #include "llvm/Support/ErrorHandling.h"
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29 #include "llvm/Support/raw_ostream.h"
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30 #include "llvm/Target/TargetLowering.h"
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31 #include "llvm/Target/TargetMachine.h"
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32 #include "llvm/Target/TargetOptions.h"
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33 #include "llvm/Target/TargetSubtargetInfo.h"
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34 using namespace llvm;
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35
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36 //===----------------------------------------------------------------------===//
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37 // Generic Code
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38 //===----------------------------------------------------------------------===//
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39
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40 /// Initialize - this method must be called before any actual lowering is
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41 /// done. This specifies the current context for codegen, and gives the
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42 /// lowering implementations a chance to set up their default sections.
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43 void TargetLoweringObjectFile::Initialize(MCContext &ctx,
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44 const TargetMachine &TM) {
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45 Ctx = &ctx;
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46 // `Initialize` can be called more than once.
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47 delete Mang;
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48 Mang = new Mangler();
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49 InitMCObjectFileInfo(TM.getTargetTriple(), TM.isPositionIndependent(), *Ctx,
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50 TM.getCodeModel() == CodeModel::Large);
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51 }
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52
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53 TargetLoweringObjectFile::~TargetLoweringObjectFile() {
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54 delete Mang;
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55 }
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56
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57 static bool isSuitableForBSS(const GlobalVariable *GV, bool NoZerosInBSS) {
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58 const Constant *C = GV->getInitializer();
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59
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60 // Must have zero initializer.
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61 if (!C->isNullValue())
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62 return false;
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63
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64 // Leave constant zeros in readonly constant sections, so they can be shared.
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65 if (GV->isConstant())
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66 return false;
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67
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68 // If the global has an explicit section specified, don't put it in BSS.
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69 if (GV->hasSection())
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70 return false;
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71
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72 // If -nozero-initialized-in-bss is specified, don't ever use BSS.
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73 if (NoZerosInBSS)
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74 return false;
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75
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76 // Otherwise, put it in BSS!
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77 return true;
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78 }
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79
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80 /// IsNullTerminatedString - Return true if the specified constant (which is
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81 /// known to have a type that is an array of 1/2/4 byte elements) ends with a
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82 /// nul value and contains no other nuls in it. Note that this is more general
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83 /// than ConstantDataSequential::isString because we allow 2 & 4 byte strings.
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84 static bool IsNullTerminatedString(const Constant *C) {
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85 // First check: is we have constant array terminated with zero
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86 if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(C)) {
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87 unsigned NumElts = CDS->getNumElements();
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88 assert(NumElts != 0 && "Can't have an empty CDS");
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89
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90 if (CDS->getElementAsInteger(NumElts-1) != 0)
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91 return false; // Not null terminated.
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92
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93 // Verify that the null doesn't occur anywhere else in the string.
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94 for (unsigned i = 0; i != NumElts-1; ++i)
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95 if (CDS->getElementAsInteger(i) == 0)
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96 return false;
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97 return true;
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98 }
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99
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100 // Another possibility: [1 x i8] zeroinitializer
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101 if (isa<ConstantAggregateZero>(C))
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102 return cast<ArrayType>(C->getType())->getNumElements() == 1;
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103
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104 return false;
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105 }
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106
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107 MCSymbol *TargetLoweringObjectFile::getSymbolWithGlobalValueBase(
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108 const GlobalValue *GV, StringRef Suffix, const TargetMachine &TM) const {
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109 assert(!Suffix.empty());
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110
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111 SmallString<60> NameStr;
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112 NameStr += GV->getParent()->getDataLayout().getPrivateGlobalPrefix();
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113 TM.getNameWithPrefix(NameStr, GV, *Mang);
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114 NameStr.append(Suffix.begin(), Suffix.end());
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115 return Ctx->getOrCreateSymbol(NameStr);
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116 }
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117
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118 MCSymbol *TargetLoweringObjectFile::getCFIPersonalitySymbol(
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119 const GlobalValue *GV, const TargetMachine &TM,
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120 MachineModuleInfo *MMI) const {
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121 return TM.getSymbol(GV);
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122 }
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123
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124 void TargetLoweringObjectFile::emitPersonalityValue(MCStreamer &Streamer,
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125 const DataLayout &,
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126 const MCSymbol *Sym) const {
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127 }
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128
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129
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130 /// getKindForGlobal - This is a top-level target-independent classifier for
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131 /// a global variable. Given an global variable and information from TM, it
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132 /// classifies the global in a variety of ways that make various target
95c75e76d11b LLVM 3.4
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parents:
diff changeset
133 /// implementations simpler. The target implementation is free to ignore this
95c75e76d11b LLVM 3.4
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parents:
diff changeset
134 /// extra info of course.
120
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diff changeset
135 SectionKind TargetLoweringObjectFile::getKindForGlobal(const GlobalObject *GO,
0
95c75e76d11b LLVM 3.4
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parents:
diff changeset
136 const TargetMachine &TM){
120
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diff changeset
137 assert(!GO->isDeclaration() && !GO->hasAvailableExternallyLinkage() &&
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
138 "Can only be used for global definitions");
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
139
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
140 Reloc::Model ReloModel = TM.getRelocationModel();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
141
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
142 // Early exit - functions should be always in text sections.
120
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diff changeset
143 const auto *GVar = dyn_cast<GlobalVariable>(GO);
77
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
144 if (!GVar)
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
145 return SectionKind::getText();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
146
95c75e76d11b LLVM 3.4
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parents:
diff changeset
147 // Handle thread-local data first.
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
148 if (GVar->isThreadLocal()) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
149 if (isSuitableForBSS(GVar, TM.Options.NoZerosInBSS))
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
150 return SectionKind::getThreadBSS();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
151 return SectionKind::getThreadData();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
152 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
153
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
154 // Variables with common linkage always get classified as common.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
155 if (GVar->hasCommonLinkage())
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
156 return SectionKind::getCommon();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
157
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
158 // Variable can be easily put to BSS section.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
159 if (isSuitableForBSS(GVar, TM.Options.NoZerosInBSS)) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
160 if (GVar->hasLocalLinkage())
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
161 return SectionKind::getBSSLocal();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
162 else if (GVar->hasExternalLinkage())
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
163 return SectionKind::getBSSExtern();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
164 return SectionKind::getBSS();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
165 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
166
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
167 const Constant *C = GVar->getInitializer();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
168
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
169 // If the global is marked constant, we can put it into a mergable section,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
170 // a mergable string section, or general .data if it contains relocations.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
171 if (GVar->isConstant()) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
172 // If the initializer for the global contains something that requires a
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
173 // relocation, then we may have to drop this into a writable data section
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
174 // even though it is marked const.
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
175 if (!C->needsRelocation()) {
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
176 // If the global is required to have a unique address, it can't be put
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
177 // into a mergable section: just drop it into the general read-only
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
178 // section instead.
120
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diff changeset
179 if (!GVar->hasGlobalUnnamedAddr())
0
95c75e76d11b LLVM 3.4
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parents:
diff changeset
180 return SectionKind::getReadOnly();
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
181
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
182 // If initializer is a null-terminated string, put it in a "cstring"
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
183 // section of the right width.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
184 if (ArrayType *ATy = dyn_cast<ArrayType>(C->getType())) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
185 if (IntegerType *ITy =
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
186 dyn_cast<IntegerType>(ATy->getElementType())) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
187 if ((ITy->getBitWidth() == 8 || ITy->getBitWidth() == 16 ||
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
188 ITy->getBitWidth() == 32) &&
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
189 IsNullTerminatedString(C)) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
190 if (ITy->getBitWidth() == 8)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
191 return SectionKind::getMergeable1ByteCString();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
192 if (ITy->getBitWidth() == 16)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
193 return SectionKind::getMergeable2ByteCString();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
194
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
195 assert(ITy->getBitWidth() == 32 && "Unknown width");
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
196 return SectionKind::getMergeable4ByteCString();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
197 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
198 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
199 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
200
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
201 // Otherwise, just drop it into a mergable constant section. If we have
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
202 // a section for this size, use it, otherwise use the arbitrary sized
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
203 // mergable section.
120
1172e4bd9c6f update 4.0.0
mir3636
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diff changeset
204 switch (
1172e4bd9c6f update 4.0.0
mir3636
parents: 100
diff changeset
205 GVar->getParent()->getDataLayout().getTypeAllocSize(C->getType())) {
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
206 case 4: return SectionKind::getMergeableConst4();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
207 case 8: return SectionKind::getMergeableConst8();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
208 case 16: return SectionKind::getMergeableConst16();
120
1172e4bd9c6f update 4.0.0
mir3636
parents: 100
diff changeset
209 case 32: return SectionKind::getMergeableConst32();
83
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
210 default:
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
211 return SectionKind::getReadOnly();
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
212 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
213
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
214 } else {
120
1172e4bd9c6f update 4.0.0
mir3636
parents: 100
diff changeset
215 // In static, ROPI and RWPI relocation models, the linker will resolve
1172e4bd9c6f update 4.0.0
mir3636
parents: 100
diff changeset
216 // all addresses, so the relocation entries will actually be constants by
1172e4bd9c6f update 4.0.0
mir3636
parents: 100
diff changeset
217 // the time the app starts up. However, we can't put this into a
1172e4bd9c6f update 4.0.0
mir3636
parents: 100
diff changeset
218 // mergable section, because the linker doesn't take relocations into
1172e4bd9c6f update 4.0.0
mir3636
parents: 100
diff changeset
219 // consideration when it tries to merge entries in the section.
1172e4bd9c6f update 4.0.0
mir3636
parents: 100
diff changeset
220 if (ReloModel == Reloc::Static || ReloModel == Reloc::ROPI ||
1172e4bd9c6f update 4.0.0
mir3636
parents: 100
diff changeset
221 ReloModel == Reloc::RWPI || ReloModel == Reloc::ROPI_RWPI)
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
222 return SectionKind::getReadOnly();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
223
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
224 // Otherwise, the dynamic linker needs to fix it up, put it in the
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
225 // writable data.rel section.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
226 return SectionKind::getReadOnlyWithRel();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
227 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
228 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
229
120
1172e4bd9c6f update 4.0.0
mir3636
parents: 100
diff changeset
230 // Okay, this isn't a constant.
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
231 return SectionKind::getData();
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
232 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
233
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
234 /// This method computes the appropriate section to emit the specified global
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
235 /// variable or function definition. This should not be passed external (or
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
236 /// available externally) globals.
120
1172e4bd9c6f update 4.0.0
mir3636
parents: 100
diff changeset
237 MCSection *TargetLoweringObjectFile::SectionForGlobal(
1172e4bd9c6f update 4.0.0
mir3636
parents: 100
diff changeset
238 const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const {
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
239 // Select section name.
120
1172e4bd9c6f update 4.0.0
mir3636
parents: 100
diff changeset
240 if (GO->hasSection())
1172e4bd9c6f update 4.0.0
mir3636
parents: 100
diff changeset
241 return getExplicitSectionGlobal(GO, Kind, TM);
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
242
121
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
243 if (auto *GVar = dyn_cast<GlobalVariable>(GO)) {
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
244 auto Attrs = GVar->getAttributes();
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
245 if ((Attrs.hasAttribute("bss-section") && Kind.isBSS()) ||
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
246 (Attrs.hasAttribute("data-section") && Kind.isData()) ||
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
247 (Attrs.hasAttribute("rodata-section") && Kind.isReadOnly())) {
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
248 return getExplicitSectionGlobal(GO, Kind, TM);
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
249 }
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
250 }
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
251
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
252 if (auto *F = dyn_cast<Function>(GO)) {
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
253 if (F->hasFnAttribute("implicit-section-name"))
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
254 return getExplicitSectionGlobal(GO, Kind, TM);
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
255 }
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
256
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
257 // Use default section depending on the 'type' of global
120
1172e4bd9c6f update 4.0.0
mir3636
parents: 100
diff changeset
258 return SelectSectionForGlobal(GO, Kind, TM);
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
259 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
260
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
261 MCSection *TargetLoweringObjectFile::getSectionForJumpTable(
120
1172e4bd9c6f update 4.0.0
mir3636
parents: 100
diff changeset
262 const Function &F, const TargetMachine &TM) const {
1172e4bd9c6f update 4.0.0
mir3636
parents: 100
diff changeset
263 unsigned Align = 0;
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
264 return getSectionForConstant(F.getParent()->getDataLayout(),
120
1172e4bd9c6f update 4.0.0
mir3636
parents: 100
diff changeset
265 SectionKind::getReadOnly(), /*C=*/nullptr,
1172e4bd9c6f update 4.0.0
mir3636
parents: 100
diff changeset
266 Align);
77
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
267 }
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
268
83
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
269 bool TargetLoweringObjectFile::shouldPutJumpTableInFunctionSection(
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
270 bool UsesLabelDifference, const Function &F) const {
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
271 // In PIC mode, we need to emit the jump table to the same section as the
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
272 // function body itself, otherwise the label differences won't make sense.
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273 // FIXME: Need a better predicate for this: what about custom entries?
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274 if (UsesLabelDifference)
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275 return true;
0
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276
83
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277 // We should also do if the section name is NULL or function is declared
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278 // in discardable section
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279 // FIXME: this isn't the right predicate, should be based on the MCSection
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280 // for the function.
121
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281 return F.isWeakForLinker();
0
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282 }
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283
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284 /// Given a mergable constant with the specified size and relocation
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285 /// information, return a section that it should be placed in.
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286 MCSection *TargetLoweringObjectFile::getSectionForConstant(
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287 const DataLayout &DL, SectionKind Kind, const Constant *C,
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288 unsigned &Align) const {
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289 if (Kind.isReadOnly() && ReadOnlySection != nullptr)
0
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290 return ReadOnlySection;
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291
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292 return DataSection;
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293 }
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294
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295 /// getTTypeGlobalReference - Return an MCExpr to use for a
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296 /// reference to the specified global variable from exception
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297 /// handling information.
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298 const MCExpr *TargetLoweringObjectFile::getTTypeGlobalReference(
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299 const GlobalValue *GV, unsigned Encoding, const TargetMachine &TM,
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300 MachineModuleInfo *MMI, MCStreamer &Streamer) const {
0
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301 const MCSymbolRefExpr *Ref =
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302 MCSymbolRefExpr::create(TM.getSymbol(GV), getContext());
0
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303
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304 return getTTypeReference(Ref, Encoding, Streamer);
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305 }
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306
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307 const MCExpr *TargetLoweringObjectFile::
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308 getTTypeReference(const MCSymbolRefExpr *Sym, unsigned Encoding,
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309 MCStreamer &Streamer) const {
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310 switch (Encoding & 0x70) {
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311 default:
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312 report_fatal_error("We do not support this DWARF encoding yet!");
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313 case dwarf::DW_EH_PE_absptr:
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314 // Do nothing special
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315 return Sym;
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316 case dwarf::DW_EH_PE_pcrel: {
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317 // Emit a label to the streamer for the current position. This gives us
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318 // .-foo addressing.
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319 MCSymbol *PCSym = getContext().createTempSymbol();
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320 Streamer.EmitLabel(PCSym);
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321 const MCExpr *PC = MCSymbolRefExpr::create(PCSym, getContext());
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322 return MCBinaryExpr::createSub(Sym, PC, getContext());
0
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323 }
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324 }
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325 }
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326
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327 const MCExpr *TargetLoweringObjectFile::getDebugThreadLocalSymbol(const MCSymbol *Sym) const {
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328 // FIXME: It's not clear what, if any, default this should have - perhaps a
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329 // null return could mean 'no location' & we should just do that here.
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330 return MCSymbolRefExpr::create(Sym, *Ctx);
0
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331 }
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332
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333 void TargetLoweringObjectFile::getNameWithPrefix(
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334 SmallVectorImpl<char> &OutName, const GlobalValue *GV,
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335 const TargetMachine &TM) const {
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336 Mang->getNameWithPrefix(OutName, GV, /*CannotUsePrivateLabel=*/false);
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337 }