1 //===- lib/MC/MCFragment.cpp - Assembler Fragment Implementation ----------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "llvm/MC/MCFragment.h" 10 #include "llvm/ADT/SmallVector.h" 11 #include "llvm/ADT/StringExtras.h" 12 #include "llvm/ADT/Twine.h" 13 #include "llvm/Config/llvm-config.h" 14 #include "llvm/MC/MCContext.h" 15 #include "llvm/MC/MCFixup.h" 16 #include "llvm/MC/MCSection.h" 17 #include "llvm/MC/MCSectionMachO.h" 18 #include "llvm/MC/MCSymbol.h" 19 #include "llvm/Support/Casting.h" 20 #include "llvm/Support/Compiler.h" 21 #include "llvm/Support/ErrorHandling.h" 22 #include "llvm/Support/raw_ostream.h" 23 #include <cassert> 24 #include <cstdint> 25 #include <utility> 26 27 using namespace llvm; 28 29 MCFragment::MCFragment(FragmentType Kind, bool HasInstructions) 30 : Kind(Kind), HasInstructions(HasInstructions), AlignToBundleEnd(false), 31 LinkerRelaxable(false), AllowAutoPadding(false) {} 32 33 void MCFragment::destroy() { 34 switch (Kind) { 35 case FT_Align: 36 cast<MCAlignFragment>(this)->~MCAlignFragment(); 37 return; 38 case FT_Data: 39 cast<MCDataFragment>(this)->~MCDataFragment(); 40 return; 41 case FT_Fill: 42 cast<MCFillFragment>(this)->~MCFillFragment(); 43 return; 44 case FT_Nops: 45 cast<MCNopsFragment>(this)->~MCNopsFragment(); 46 return; 47 case FT_Relaxable: 48 cast<MCRelaxableFragment>(this)->~MCRelaxableFragment(); 49 return; 50 case FT_Org: 51 cast<MCOrgFragment>(this)->~MCOrgFragment(); 52 return; 53 case FT_Dwarf: 54 cast<MCDwarfLineAddrFragment>(this)->~MCDwarfLineAddrFragment(); 55 return; 56 case FT_DwarfFrame: 57 cast<MCDwarfCallFrameFragment>(this)->~MCDwarfCallFrameFragment(); 58 return; 59 case FT_LEB: 60 cast<MCLEBFragment>(this)->~MCLEBFragment(); 61 return; 62 case FT_BoundaryAlign: 63 cast<MCBoundaryAlignFragment>(this)->~MCBoundaryAlignFragment(); 64 return; 65 case FT_SymbolId: 66 cast<MCSymbolIdFragment>(this)->~MCSymbolIdFragment(); 67 return; 68 case FT_CVInlineLines: 69 cast<MCCVInlineLineTableFragment>(this)->~MCCVInlineLineTableFragment(); 70 return; 71 case FT_CVDefRange: 72 cast<MCCVDefRangeFragment>(this)->~MCCVDefRangeFragment(); 73 return; 74 case FT_PseudoProbe: 75 cast<MCPseudoProbeAddrFragment>(this)->~MCPseudoProbeAddrFragment(); 76 return; 77 case FT_Dummy: 78 cast<MCDummyFragment>(this)->~MCDummyFragment(); 79 return; 80 } 81 } 82 83 const MCSymbol *MCFragment::getAtom() const { 84 return cast<MCSectionMachO>(Parent)->getAtom(LayoutOrder); 85 } 86 87 // Debugging methods 88 89 namespace llvm { 90 91 raw_ostream &operator<<(raw_ostream &OS, const MCFixup &AF) { 92 OS << "<MCFixup" << " Offset:" << AF.getOffset() 93 << " Value:" << *AF.getValue() 94 << " Kind:" << AF.getKind() << ">"; 95 return OS; 96 } 97 98 } // end namespace llvm 99 100 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP) 101 LLVM_DUMP_METHOD void MCFragment::dump() const { 102 raw_ostream &OS = errs(); 103 104 OS << "<"; 105 switch (getKind()) { 106 case MCFragment::FT_Align: OS << "MCAlignFragment"; break; 107 case MCFragment::FT_Data: OS << "MCDataFragment"; break; 108 case MCFragment::FT_Fill: OS << "MCFillFragment"; break; 109 case MCFragment::FT_Nops: 110 OS << "MCFNopsFragment"; 111 break; 112 case MCFragment::FT_Relaxable: OS << "MCRelaxableFragment"; break; 113 case MCFragment::FT_Org: OS << "MCOrgFragment"; break; 114 case MCFragment::FT_Dwarf: OS << "MCDwarfFragment"; break; 115 case MCFragment::FT_DwarfFrame: OS << "MCDwarfCallFrameFragment"; break; 116 case MCFragment::FT_LEB: OS << "MCLEBFragment"; break; 117 case MCFragment::FT_BoundaryAlign: OS<<"MCBoundaryAlignFragment"; break; 118 case MCFragment::FT_SymbolId: OS << "MCSymbolIdFragment"; break; 119 case MCFragment::FT_CVInlineLines: OS << "MCCVInlineLineTableFragment"; break; 120 case MCFragment::FT_CVDefRange: OS << "MCCVDefRangeTableFragment"; break; 121 case MCFragment::FT_PseudoProbe: 122 OS << "MCPseudoProbe"; 123 break; 124 case MCFragment::FT_Dummy: OS << "MCDummyFragment"; break; 125 } 126 127 OS << "<MCFragment " << (const void *)this << " LayoutOrder:" << LayoutOrder 128 << " Offset:" << Offset << " HasInstructions:" << hasInstructions(); 129 if (const auto *EF = dyn_cast<MCEncodedFragment>(this)) 130 OS << " BundlePadding:" << static_cast<unsigned>(EF->getBundlePadding()); 131 OS << ">"; 132 133 switch (getKind()) { 134 case MCFragment::FT_Align: { 135 const auto *AF = cast<MCAlignFragment>(this); 136 if (AF->hasEmitNops()) 137 OS << " (emit nops)"; 138 OS << "\n "; 139 OS << " Alignment:" << AF->getAlignment().value() 140 << " Value:" << AF->getValue() << " ValueSize:" << AF->getValueSize() 141 << " MaxBytesToEmit:" << AF->getMaxBytesToEmit() << ">"; 142 break; 143 } 144 case MCFragment::FT_Data: { 145 const auto *DF = cast<MCDataFragment>(this); 146 OS << "\n "; 147 OS << " Contents:["; 148 const SmallVectorImpl<char> &Contents = DF->getContents(); 149 for (unsigned i = 0, e = Contents.size(); i != e; ++i) { 150 if (i) OS << ","; 151 OS << hexdigit((Contents[i] >> 4) & 0xF) << hexdigit(Contents[i] & 0xF); 152 } 153 OS << "] (" << Contents.size() << " bytes)"; 154 155 if (DF->fixup_begin() != DF->fixup_end()) { 156 OS << ",\n "; 157 OS << " Fixups:["; 158 for (MCDataFragment::const_fixup_iterator it = DF->fixup_begin(), 159 ie = DF->fixup_end(); it != ie; ++it) { 160 if (it != DF->fixup_begin()) OS << ",\n "; 161 OS << *it; 162 } 163 OS << "]"; 164 } 165 break; 166 } 167 case MCFragment::FT_Fill: { 168 const auto *FF = cast<MCFillFragment>(this); 169 OS << " Value:" << static_cast<unsigned>(FF->getValue()) 170 << " ValueSize:" << static_cast<unsigned>(FF->getValueSize()) 171 << " NumValues:" << FF->getNumValues(); 172 break; 173 } 174 case MCFragment::FT_Nops: { 175 const auto *NF = cast<MCNopsFragment>(this); 176 OS << " NumBytes:" << NF->getNumBytes() 177 << " ControlledNopLength:" << NF->getControlledNopLength(); 178 break; 179 } 180 case MCFragment::FT_Relaxable: { 181 const auto *F = cast<MCRelaxableFragment>(this); 182 OS << "\n "; 183 OS << " Inst:"; 184 F->getInst().dump_pretty(OS); 185 OS << " (" << F->getContents().size() << " bytes)"; 186 break; 187 } 188 case MCFragment::FT_Org: { 189 const auto *OF = cast<MCOrgFragment>(this); 190 OS << "\n "; 191 OS << " Offset:" << OF->getOffset() 192 << " Value:" << static_cast<unsigned>(OF->getValue()); 193 break; 194 } 195 case MCFragment::FT_Dwarf: { 196 const auto *OF = cast<MCDwarfLineAddrFragment>(this); 197 OS << "\n "; 198 OS << " AddrDelta:" << OF->getAddrDelta() 199 << " LineDelta:" << OF->getLineDelta(); 200 break; 201 } 202 case MCFragment::FT_DwarfFrame: { 203 const auto *CF = cast<MCDwarfCallFrameFragment>(this); 204 OS << "\n "; 205 OS << " AddrDelta:" << CF->getAddrDelta(); 206 break; 207 } 208 case MCFragment::FT_LEB: { 209 const auto *LF = cast<MCLEBFragment>(this); 210 OS << "\n "; 211 OS << " Value:" << LF->getValue() << " Signed:" << LF->isSigned(); 212 break; 213 } 214 case MCFragment::FT_BoundaryAlign: { 215 const auto *BF = cast<MCBoundaryAlignFragment>(this); 216 OS << "\n "; 217 OS << " BoundarySize:" << BF->getAlignment().value() 218 << " LastFragment:" << BF->getLastFragment() 219 << " Size:" << BF->getSize(); 220 break; 221 } 222 case MCFragment::FT_SymbolId: { 223 const auto *F = cast<MCSymbolIdFragment>(this); 224 OS << "\n "; 225 OS << " Sym:" << F->getSymbol(); 226 break; 227 } 228 case MCFragment::FT_CVInlineLines: { 229 const auto *F = cast<MCCVInlineLineTableFragment>(this); 230 OS << "\n "; 231 OS << " Sym:" << *F->getFnStartSym(); 232 break; 233 } 234 case MCFragment::FT_CVDefRange: { 235 const auto *F = cast<MCCVDefRangeFragment>(this); 236 OS << "\n "; 237 for (std::pair<const MCSymbol *, const MCSymbol *> RangeStartEnd : 238 F->getRanges()) { 239 OS << " RangeStart:" << RangeStartEnd.first; 240 OS << " RangeEnd:" << RangeStartEnd.second; 241 } 242 break; 243 } 244 case MCFragment::FT_PseudoProbe: { 245 const auto *OF = cast<MCPseudoProbeAddrFragment>(this); 246 OS << "\n "; 247 OS << " AddrDelta:" << OF->getAddrDelta(); 248 break; 249 } 250 case MCFragment::FT_Dummy: 251 break; 252 } 253 OS << ">"; 254 } 255 #endif 256