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1 //=== HexagonMCELFStreamer.cpp - Hexagon subclass of MCELFStreamer -------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // This file is a stub that parses a MCInst bundle and passes the
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10 // instructions on to the real streamer.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "MCTargetDesc/HexagonMCELFStreamer.h"
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15 #include "MCTargetDesc/HexagonMCInstrInfo.h"
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16 #include "MCTargetDesc/HexagonMCShuffler.h"
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17 #include "llvm/ADT/StringRef.h"
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18 #include "llvm/BinaryFormat/ELF.h"
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19 #include "llvm/MC/MCAsmBackend.h"
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20 #include "llvm/MC/MCAssembler.h"
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21 #include "llvm/MC/MCCodeEmitter.h"
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22 #include "llvm/MC/MCContext.h"
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23 #include "llvm/MC/MCExpr.h"
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24 #include "llvm/MC/MCInst.h"
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25 #include "llvm/MC/MCObjectStreamer.h"
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26 #include "llvm/MC/MCObjectWriter.h"
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27 #include "llvm/MC/MCSection.h"
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28 #include "llvm/MC/MCSectionELF.h"
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29 #include "llvm/MC/MCStreamer.h"
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30 #include "llvm/MC/MCSymbol.h"
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31 #include "llvm/MC/MCSymbolELF.h"
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32 #include "llvm/Support/Casting.h"
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33 #include "llvm/Support/CommandLine.h"
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34 #include "llvm/Support/ErrorHandling.h"
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35 #include "llvm/Support/MathExtras.h"
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36 #include <cassert>
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37 #include <cstdint>
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38
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221
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39 #define DEBUG_TYPE "hexagonmcelfstreamer"
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40
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150
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41 using namespace llvm;
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42
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43 static cl::opt<unsigned> GPSize
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44 ("gpsize", cl::NotHidden,
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45 cl::desc("Global Pointer Addressing Size. The default size is 8."),
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46 cl::Prefix,
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47 cl::init(8));
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48
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49 HexagonMCELFStreamer::HexagonMCELFStreamer(
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50 MCContext &Context, std::unique_ptr<MCAsmBackend> TAB,
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51 std::unique_ptr<MCObjectWriter> OW, std::unique_ptr<MCCodeEmitter> Emitter)
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52 : MCELFStreamer(Context, std::move(TAB), std::move(OW), std::move(Emitter)),
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53 MCII(createHexagonMCInstrInfo()) {}
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54
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55 HexagonMCELFStreamer::HexagonMCELFStreamer(
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56 MCContext &Context, std::unique_ptr<MCAsmBackend> TAB,
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57 std::unique_ptr<MCObjectWriter> OW, std::unique_ptr<MCCodeEmitter> Emitter,
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58 MCAssembler *Assembler)
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59 : MCELFStreamer(Context, std::move(TAB), std::move(OW), std::move(Emitter)),
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60 MCII(createHexagonMCInstrInfo()) {}
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61
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173
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62 void HexagonMCELFStreamer::emitInstruction(const MCInst &MCB,
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150
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63 const MCSubtargetInfo &STI) {
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64 assert(MCB.getOpcode() == Hexagon::BUNDLE);
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65 assert(HexagonMCInstrInfo::bundleSize(MCB) <= HEXAGON_PACKET_SIZE);
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66 assert(HexagonMCInstrInfo::bundleSize(MCB) > 0);
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67
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68 // At this point, MCB is a bundle
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69 // Iterate through the bundle and assign addends for the instructions
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70 for (auto const &I : HexagonMCInstrInfo::bundleInstructions(MCB)) {
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71 MCInst *MCI = const_cast<MCInst *>(I.getInst());
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72 EmitSymbol(*MCI);
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73 }
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74
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75 MCObjectStreamer::emitInstruction(MCB, STI);
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150
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76 }
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77
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78 void HexagonMCELFStreamer::EmitSymbol(const MCInst &Inst) {
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79 // Scan for values.
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80 for (unsigned i = Inst.getNumOperands(); i--;)
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81 if (Inst.getOperand(i).isExpr())
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82 visitUsedExpr(*Inst.getOperand(i).getExpr());
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83 }
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84
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85 // EmitCommonSymbol and EmitLocalCommonSymbol are extended versions of the
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86 // functions found in MCELFStreamer.cpp taking AccessSize as an additional
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87 // parameter.
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88 void HexagonMCELFStreamer::HexagonMCEmitCommonSymbol(MCSymbol *Symbol,
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89 uint64_t Size,
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252
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90 Align ByteAlignment,
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150
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91 unsigned AccessSize) {
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92 getAssembler().registerSymbol(*Symbol);
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93 StringRef sbss[4] = {".sbss.1", ".sbss.2", ".sbss.4", ".sbss.8"};
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94
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95 auto ELFSymbol = cast<MCSymbolELF>(Symbol);
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96 if (!ELFSymbol->isBindingSet()) {
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97 ELFSymbol->setBinding(ELF::STB_GLOBAL);
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98 ELFSymbol->setExternal(true);
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99 }
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100
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101 ELFSymbol->setType(ELF::STT_OBJECT);
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102
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103 if (ELFSymbol->getBinding() == ELF::STB_LOCAL) {
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104 StringRef SectionName =
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105 ((AccessSize == 0) || (Size == 0) || (Size > GPSize))
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106 ? ".bss"
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107 : sbss[(Log2_64(AccessSize))];
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108 MCSection &Section = *getAssembler().getContext().getELFSection(
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109 SectionName, ELF::SHT_NOBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
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110 MCSectionSubPair P = getCurrentSection();
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236
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111 switchSection(&Section);
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150
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112
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113 if (ELFSymbol->isUndefined()) {
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114 emitValueToAlignment(ByteAlignment, 0, 1, 0);
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115 emitLabel(Symbol);
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116 emitZeros(Size);
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150
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117 }
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118
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119 // Update the maximum alignment of the section if necessary.
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252
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120 Section.ensureMinAlignment(ByteAlignment);
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150
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121
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236
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122 switchSection(P.first, P.second);
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150
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123 } else {
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124 if (ELFSymbol->declareCommon(Size, ByteAlignment))
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125 report_fatal_error("Symbol: " + Symbol->getName() +
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126 " redeclared as different type");
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127 if ((AccessSize) && (Size <= GPSize)) {
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128 uint64_t SectionIndex =
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129 (AccessSize <= GPSize)
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252
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130 ? ELF::SHN_HEXAGON_SCOMMON + llvm::bit_width(AccessSize)
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131 : (unsigned)ELF::SHN_HEXAGON_SCOMMON;
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132 ELFSymbol->setIndex(SectionIndex);
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133 }
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134 }
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135
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136 ELFSymbol->setSize(MCConstantExpr::create(Size, getContext()));
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137 }
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138
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139 void HexagonMCELFStreamer::HexagonMCEmitLocalCommonSymbol(MCSymbol *Symbol,
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252
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140 uint64_t Size,
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141 Align ByteAlignment,
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142 unsigned AccessSize) {
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150
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143 getAssembler().registerSymbol(*Symbol);
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144 auto ELFSymbol = cast<MCSymbolELF>(Symbol);
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145 ELFSymbol->setBinding(ELF::STB_LOCAL);
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146 ELFSymbol->setExternal(false);
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147 HexagonMCEmitCommonSymbol(Symbol, Size, ByteAlignment, AccessSize);
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148 }
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149
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150 namespace llvm {
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151 MCStreamer *createHexagonELFStreamer(Triple const &TT, MCContext &Context,
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152 std::unique_ptr<MCAsmBackend> MAB,
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153 std::unique_ptr<MCObjectWriter> OW,
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154 std::unique_ptr<MCCodeEmitter> CE) {
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155 return new HexagonMCELFStreamer(Context, std::move(MAB), std::move(OW),
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156 std::move(CE));
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157 }
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158
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159 } // end namespace llvm
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