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annotate lib/Target/TargetLoweringObjectFile.cpp @ 95:afa8332a0e37 LLVM3.8

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LLVM 3.8
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Tue, 13 Oct 2015 17:48:58 +0900
parents 60c9769439b8
children 7d135dc70f03
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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/IR/Constants.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/IR/Mangler.h"
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22 #include "llvm/MC/MCAsmInfo.h"
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23 #include "llvm/MC/MCContext.h"
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24 #include "llvm/MC/MCExpr.h"
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25 #include "llvm/MC/MCStreamer.h"
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26 #include "llvm/MC/MCSymbol.h"
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27 #include "llvm/Support/Dwarf.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 InitMCObjectFileInfo(TM.getTargetTriple(), TM.getRelocationModel(),
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47 TM.getCodeModel(), *Ctx);
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48 }
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49
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50 TargetLoweringObjectFile::~TargetLoweringObjectFile() {
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51 }
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52
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53 static bool isSuitableForBSS(const GlobalVariable *GV, bool NoZerosInBSS) {
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54 const Constant *C = GV->getInitializer();
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55
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56 // Must have zero initializer.
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57 if (!C->isNullValue())
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58 return false;
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59
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60 // Leave constant zeros in readonly constant sections, so they can be shared.
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61 if (GV->isConstant())
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62 return false;
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63
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64 // If the global has an explicit section specified, don't put it in BSS.
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65 if (GV->hasSection())
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66 return false;
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67
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68 // If -nozero-initialized-in-bss is specified, don't ever use BSS.
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69 if (NoZerosInBSS)
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70 return false;
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71
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72 // Otherwise, put it in BSS!
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73 return true;
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74 }
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75
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76 /// IsNullTerminatedString - Return true if the specified constant (which is
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77 /// known to have a type that is an array of 1/2/4 byte elements) ends with a
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78 /// nul value and contains no other nuls in it. Note that this is more general
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79 /// than ConstantDataSequential::isString because we allow 2 & 4 byte strings.
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80 static bool IsNullTerminatedString(const Constant *C) {
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81 // First check: is we have constant array terminated with zero
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82 if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(C)) {
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83 unsigned NumElts = CDS->getNumElements();
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84 assert(NumElts != 0 && "Can't have an empty CDS");
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85
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86 if (CDS->getElementAsInteger(NumElts-1) != 0)
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87 return false; // Not null terminated.
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88
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89 // Verify that the null doesn't occur anywhere else in the string.
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90 for (unsigned i = 0; i != NumElts-1; ++i)
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91 if (CDS->getElementAsInteger(i) == 0)
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92 return false;
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93 return true;
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94 }
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95
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96 // Another possibility: [1 x i8] zeroinitializer
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97 if (isa<ConstantAggregateZero>(C))
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98 return cast<ArrayType>(C->getType())->getNumElements() == 1;
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99
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100 return false;
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101 }
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102
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103 MCSymbol *TargetLoweringObjectFile::getSymbolWithGlobalValueBase(
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104 const GlobalValue *GV, StringRef Suffix, Mangler &Mang,
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105 const TargetMachine &TM) const {
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106 assert(!Suffix.empty());
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107
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108 SmallString<60> NameStr;
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109 NameStr += GV->getParent()->getDataLayout().getPrivateGlobalPrefix();
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110 TM.getNameWithPrefix(NameStr, GV, Mang);
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111 NameStr.append(Suffix.begin(), Suffix.end());
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112 return Ctx->getOrCreateSymbol(NameStr);
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113 }
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114
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115 MCSymbol *TargetLoweringObjectFile::getCFIPersonalitySymbol(
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116 const GlobalValue *GV, Mangler &Mang, const TargetMachine &TM,
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117 MachineModuleInfo *MMI) const {
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118 return TM.getSymbol(GV, Mang);
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119 }
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120
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121 void TargetLoweringObjectFile::emitPersonalityValue(MCStreamer &Streamer,
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122 const DataLayout &,
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123 const MCSymbol *Sym) const {
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124 }
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125
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126
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127 /// getKindForGlobal - This is a top-level target-independent classifier for
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128 /// a global variable. Given an global variable and information from TM, it
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parents:
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129 /// classifies the global in a variety of ways that make various target
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
130 /// implementations simpler. The target implementation is free to ignore this
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
131 /// extra info of course.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
132 SectionKind TargetLoweringObjectFile::getKindForGlobal(const GlobalValue *GV,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
133 const TargetMachine &TM){
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
134 assert(!GV->isDeclaration() && !GV->hasAvailableExternallyLinkage() &&
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
135 "Can only be used for global definitions");
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
136
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
137 Reloc::Model ReloModel = TM.getRelocationModel();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
138
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
139 // Early exit - functions should be always in text sections.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
140 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV);
77
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
141 if (!GVar)
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
142 return SectionKind::getText();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
143
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
144 // Handle thread-local data first.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
145 if (GVar->isThreadLocal()) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
146 if (isSuitableForBSS(GVar, TM.Options.NoZerosInBSS))
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
147 return SectionKind::getThreadBSS();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
148 return SectionKind::getThreadData();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
149 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
150
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
151 // Variables with common linkage always get classified as common.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
152 if (GVar->hasCommonLinkage())
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
153 return SectionKind::getCommon();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
154
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
155 // Variable can be easily put to BSS section.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
156 if (isSuitableForBSS(GVar, TM.Options.NoZerosInBSS)) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
157 if (GVar->hasLocalLinkage())
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
158 return SectionKind::getBSSLocal();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
159 else if (GVar->hasExternalLinkage())
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
160 return SectionKind::getBSSExtern();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
161 return SectionKind::getBSS();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
162 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
163
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
164 const Constant *C = GVar->getInitializer();
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 // 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
167 // 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
168 if (GVar->isConstant()) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
169 // 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
170 // 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
171 // even though it is marked const.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
172 switch (C->getRelocationInfo()) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
173 case Constant::NoRelocation:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
174 // 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
175 // 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
176 // section instead.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
177 if (!GVar->hasUnnamedAddr())
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
178 return SectionKind::getReadOnly();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
179
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
180 // 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
181 // section of the right width.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
182 if (ArrayType *ATy = dyn_cast<ArrayType>(C->getType())) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
183 if (IntegerType *ITy =
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
184 dyn_cast<IntegerType>(ATy->getElementType())) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
185 if ((ITy->getBitWidth() == 8 || ITy->getBitWidth() == 16 ||
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
186 ITy->getBitWidth() == 32) &&
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
187 IsNullTerminatedString(C)) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
188 if (ITy->getBitWidth() == 8)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
189 return SectionKind::getMergeable1ByteCString();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
190 if (ITy->getBitWidth() == 16)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
191 return SectionKind::getMergeable2ByteCString();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
192
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
193 assert(ITy->getBitWidth() == 32 && "Unknown width");
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
194 return SectionKind::getMergeable4ByteCString();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
195 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
196 }
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 // 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
200 // 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
201 // mergable section.
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
202 switch (GV->getParent()->getDataLayout().getTypeAllocSize(C->getType())) {
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
203 case 4: return SectionKind::getMergeableConst4();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
204 case 8: return SectionKind::getMergeableConst8();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
205 case 16: return SectionKind::getMergeableConst16();
83
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
206 default:
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
207 return SectionKind::getReadOnly();
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
208 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
209
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
210 case Constant::LocalRelocation:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
211 // In static relocation model, the linker will resolve all addresses, so
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
212 // the relocation entries will actually be constants by the time the app
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
213 // starts up. However, we can't put this into a mergable section, because
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
214 // the linker doesn't take relocations into consideration when it tries to
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
215 // merge entries in the section.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
216 if (ReloModel == Reloc::Static)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
217 return SectionKind::getReadOnly();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
218
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
219 // 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
220 // writable data.rel.local section.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
221 return SectionKind::getReadOnlyWithRelLocal();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
222
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
223 case Constant::GlobalRelocations:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
224 // In static relocation model, the linker will resolve all addresses, so
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
225 // the relocation entries will actually be constants by the time the app
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
226 // starts up. However, we can't put this into a mergable section, because
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
227 // the linker doesn't take relocations into consideration when it tries to
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
228 // merge entries in the section.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
229 if (ReloModel == Reloc::Static)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
230 return SectionKind::getReadOnly();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
231
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
232 // 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
233 // writable data.rel section.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
234 return SectionKind::getReadOnlyWithRel();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
235 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
236 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
237
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
238 // Okay, this isn't a constant. If the initializer for the global is going
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
239 // to require a runtime relocation by the dynamic linker, put it into a more
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
240 // specific section to improve startup time of the app. This coalesces these
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
241 // globals together onto fewer pages, improving the locality of the dynamic
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
242 // linker.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
243 if (ReloModel == Reloc::Static)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
244 return SectionKind::getDataNoRel();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
245
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
246 switch (C->getRelocationInfo()) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
247 case Constant::NoRelocation:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
248 return SectionKind::getDataNoRel();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
249 case Constant::LocalRelocation:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
250 return SectionKind::getDataRelLocal();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
251 case Constant::GlobalRelocations:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
252 return SectionKind::getDataRel();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
253 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
254 llvm_unreachable("Invalid relocation");
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
255 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
256
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
257 /// 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
258 /// 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
259 /// available externally) globals.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
260 MCSection *
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261 TargetLoweringObjectFile::SectionForGlobal(const GlobalValue *GV,
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262 SectionKind Kind, Mangler &Mang,
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263 const TargetMachine &TM) const {
0
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264 // Select section name.
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265 if (GV->hasSection())
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266 return getExplicitSectionGlobal(GV, Kind, Mang, TM);
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267
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268
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269 // Use default section depending on the 'type' of global
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270 return SelectSectionForGlobal(GV, Kind, Mang, TM);
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271 }
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272
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273 MCSection *TargetLoweringObjectFile::getSectionForJumpTable(
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274 const Function &F, Mangler &Mang, const TargetMachine &TM) const {
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275 return getSectionForConstant(F.getParent()->getDataLayout(),
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276 SectionKind::getReadOnly(), /*C=*/nullptr);
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277 }
0
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278
83
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279 bool TargetLoweringObjectFile::shouldPutJumpTableInFunctionSection(
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280 bool UsesLabelDifference, const Function &F) const {
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281 // In PIC mode, we need to emit the jump table to the same section as the
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282 // function body itself, otherwise the label differences won't make sense.
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283 // FIXME: Need a better predicate for this: what about custom entries?
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284 if (UsesLabelDifference)
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285 return true;
0
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286
83
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287 // We should also do if the section name is NULL or function is declared
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288 // in discardable section
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289 // FIXME: this isn't the right predicate, should be based on the MCSection
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290 // for the function.
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291 if (F.isWeakForLinker())
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292 return true;
0
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293
83
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294 return false;
0
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295 }
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296
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297 /// Given a mergable constant with the specified size and relocation
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298 /// information, return a section that it should be placed in.
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299 MCSection *TargetLoweringObjectFile::getSectionForConstant(
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300 const DataLayout &DL, SectionKind Kind, const Constant *C) const {
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301 if (Kind.isReadOnly() && ReadOnlySection != nullptr)
0
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302 return ReadOnlySection;
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303
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304 return DataSection;
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305 }
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306
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307 /// getTTypeGlobalReference - Return an MCExpr to use for a
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308 /// reference to the specified global variable from exception
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309 /// handling information.
77
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310 const MCExpr *TargetLoweringObjectFile::getTTypeGlobalReference(
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311 const GlobalValue *GV, unsigned Encoding, Mangler &Mang,
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312 const TargetMachine &TM, MachineModuleInfo *MMI,
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313 MCStreamer &Streamer) const {
0
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314 const MCSymbolRefExpr *Ref =
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315 MCSymbolRefExpr::create(TM.getSymbol(GV, Mang), getContext());
0
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316
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317 return getTTypeReference(Ref, Encoding, Streamer);
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318 }
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319
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320 const MCExpr *TargetLoweringObjectFile::
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321 getTTypeReference(const MCSymbolRefExpr *Sym, unsigned Encoding,
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322 MCStreamer &Streamer) const {
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323 switch (Encoding & 0x70) {
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324 default:
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325 report_fatal_error("We do not support this DWARF encoding yet!");
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326 case dwarf::DW_EH_PE_absptr:
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327 // Do nothing special
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328 return Sym;
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329 case dwarf::DW_EH_PE_pcrel: {
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330 // Emit a label to the streamer for the current position. This gives us
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331 // .-foo addressing.
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332 MCSymbol *PCSym = getContext().createTempSymbol();
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333 Streamer.EmitLabel(PCSym);
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334 const MCExpr *PC = MCSymbolRefExpr::create(PCSym, getContext());
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335 return MCBinaryExpr::createSub(Sym, PC, getContext());
0
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336 }
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337 }
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338 }
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339
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340 const MCExpr *TargetLoweringObjectFile::getDebugThreadLocalSymbol(const MCSymbol *Sym) const {
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341 // FIXME: It's not clear what, if any, default this should have - perhaps a
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342 // null return could mean 'no location' & we should just do that here.
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343 return MCSymbolRefExpr::create(Sym, *Ctx);
0
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344 }
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345
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346 void TargetLoweringObjectFile::getNameWithPrefix(
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347 SmallVectorImpl<char> &OutName, const GlobalValue *GV,
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348 bool CannotUsePrivateLabel, Mangler &Mang, const TargetMachine &TM) const {
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349 Mang.getNameWithPrefix(OutName, GV, CannotUsePrivateLabel);
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350 }