1 //===--- lib/CodeGen/DIE.cpp - DWARF Info Entries -------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // Data structures for DWARF info entries. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "DIE.h" 15 #include "llvm/ADT/Twine.h" 16 #include "llvm/CodeGen/AsmPrinter.h" 17 #include "llvm/MC/MCAsmInfo.h" 18 #include "llvm/MC/MCStreamer.h" 19 #include "llvm/MC/MCSymbol.h" 20 #include "llvm/Target/TargetData.h" 21 #include "llvm/Support/Allocator.h" 22 #include "llvm/Support/Debug.h" 23 #include "llvm/Support/ErrorHandling.h" 24 #include "llvm/Support/Format.h" 25 #include "llvm/Support/FormattedStream.h" 26 using namespace llvm; 27 28 //===----------------------------------------------------------------------===// 29 // DIEAbbrevData Implementation 30 //===----------------------------------------------------------------------===// 31 32 /// Profile - Used to gather unique data for the abbreviation folding set. 33 /// 34 void DIEAbbrevData::Profile(FoldingSetNodeID &ID) const { 35 ID.AddInteger(Attribute); 36 ID.AddInteger(Form); 37 } 38 39 //===----------------------------------------------------------------------===// 40 // DIEAbbrev Implementation 41 //===----------------------------------------------------------------------===// 42 43 /// Profile - Used to gather unique data for the abbreviation folding set. 44 /// 45 void DIEAbbrev::Profile(FoldingSetNodeID &ID) const { 46 ID.AddInteger(Tag); 47 ID.AddInteger(ChildrenFlag); 48 49 // For each attribute description. 50 for (unsigned i = 0, N = Data.size(); i < N; ++i) 51 Data[i].Profile(ID); 52 } 53 54 /// Emit - Print the abbreviation using the specified asm printer. 55 /// 56 void DIEAbbrev::Emit(AsmPrinter *AP) const { 57 // Emit its Dwarf tag type. 58 // FIXME: Doing work even in non-asm-verbose runs. 59 AP->EmitULEB128(Tag, dwarf::TagString(Tag)); 60 61 // Emit whether it has children DIEs. 62 // FIXME: Doing work even in non-asm-verbose runs. 63 AP->EmitULEB128(ChildrenFlag, dwarf::ChildrenString(ChildrenFlag)); 64 65 // For each attribute description. 66 for (unsigned i = 0, N = Data.size(); i < N; ++i) { 67 const DIEAbbrevData &AttrData = Data[i]; 68 69 // Emit attribute type. 70 // FIXME: Doing work even in non-asm-verbose runs. 71 AP->EmitULEB128(AttrData.getAttribute(), 72 dwarf::AttributeString(AttrData.getAttribute())); 73 74 // Emit form type. 75 // FIXME: Doing work even in non-asm-verbose runs. 76 AP->EmitULEB128(AttrData.getForm(), 77 dwarf::FormEncodingString(AttrData.getForm())); 78 } 79 80 // Mark end of abbreviation. 81 AP->EmitULEB128(0, "EOM(1)"); 82 AP->EmitULEB128(0, "EOM(2)"); 83 } 84 85 #ifndef NDEBUG 86 void DIEAbbrev::print(raw_ostream &O) { 87 O << "Abbreviation @" 88 << format("0x%lx", (long)(intptr_t)this) 89 << " " 90 << dwarf::TagString(Tag) 91 << " " 92 << dwarf::ChildrenString(ChildrenFlag) 93 << '\n'; 94 95 for (unsigned i = 0, N = Data.size(); i < N; ++i) { 96 O << " " 97 << dwarf::AttributeString(Data[i].getAttribute()) 98 << " " 99 << dwarf::FormEncodingString(Data[i].getForm()) 100 << '\n'; 101 } 102 } 103 void DIEAbbrev::dump() { print(dbgs()); } 104 #endif 105 106 //===----------------------------------------------------------------------===// 107 // DIE Implementation 108 //===----------------------------------------------------------------------===// 109 110 DIE::~DIE() { 111 for (unsigned i = 0, N = Children.size(); i < N; ++i) 112 delete Children[i]; 113 } 114 115 /// addSiblingOffset - Add a sibling offset field to the front of the DIE. 116 /// 117 DIEValue *DIE::addSiblingOffset(BumpPtrAllocator &A) { 118 DIEInteger *DI = new (A) DIEInteger(0); 119 Values.insert(Values.begin(), DI); 120 Abbrev.AddFirstAttribute(dwarf::DW_AT_sibling, dwarf::DW_FORM_ref4); 121 return DI; 122 } 123 124 #ifndef NDEBUG 125 void DIE::print(raw_ostream &O, unsigned IncIndent) { 126 IndentCount += IncIndent; 127 const std::string Indent(IndentCount, ' '); 128 bool isBlock = Abbrev.getTag() == 0; 129 130 if (!isBlock) { 131 O << Indent 132 << "Die: " 133 << format("0x%lx", (long)(intptr_t)this) 134 << ", Offset: " << Offset 135 << ", Size: " << Size << "\n"; 136 137 O << Indent 138 << dwarf::TagString(Abbrev.getTag()) 139 << " " 140 << dwarf::ChildrenString(Abbrev.getChildrenFlag()) << "\n"; 141 } else { 142 O << "Size: " << Size << "\n"; 143 } 144 145 const SmallVector<DIEAbbrevData, 8> &Data = Abbrev.getData(); 146 147 IndentCount += 2; 148 for (unsigned i = 0, N = Data.size(); i < N; ++i) { 149 O << Indent; 150 151 if (!isBlock) 152 O << dwarf::AttributeString(Data[i].getAttribute()); 153 else 154 O << "Blk[" << i << "]"; 155 156 O << " " 157 << dwarf::FormEncodingString(Data[i].getForm()) 158 << " "; 159 Values[i]->print(O); 160 O << "\n"; 161 } 162 IndentCount -= 2; 163 164 for (unsigned j = 0, M = Children.size(); j < M; ++j) { 165 Children[j]->print(O, 4); 166 } 167 168 if (!isBlock) O << "\n"; 169 IndentCount -= IncIndent; 170 } 171 172 void DIE::dump() { 173 print(dbgs()); 174 } 175 #endif 176 177 178 #ifndef NDEBUG 179 void DIEValue::dump() { 180 print(dbgs()); 181 } 182 #endif 183 184 //===----------------------------------------------------------------------===// 185 // DIEInteger Implementation 186 //===----------------------------------------------------------------------===// 187 188 /// EmitValue - Emit integer of appropriate size. 189 /// 190 void DIEInteger::EmitValue(AsmPrinter *Asm, unsigned Form) const { 191 unsigned Size = ~0U; 192 switch (Form) { 193 case dwarf::DW_FORM_flag: // Fall thru 194 case dwarf::DW_FORM_ref1: // Fall thru 195 case dwarf::DW_FORM_data1: Size = 1; break; 196 case dwarf::DW_FORM_ref2: // Fall thru 197 case dwarf::DW_FORM_data2: Size = 2; break; 198 case dwarf::DW_FORM_ref4: // Fall thru 199 case dwarf::DW_FORM_data4: Size = 4; break; 200 case dwarf::DW_FORM_ref8: // Fall thru 201 case dwarf::DW_FORM_data8: Size = 8; break; 202 case dwarf::DW_FORM_udata: Asm->EmitULEB128(Integer); return; 203 case dwarf::DW_FORM_sdata: Asm->EmitSLEB128(Integer); return; 204 case dwarf::DW_FORM_addr: Size = Asm->getTargetData().getPointerSize(); break; 205 default: llvm_unreachable("DIE Value form not supported yet"); 206 } 207 Asm->OutStreamer.EmitIntValue(Integer, Size, 0/*addrspace*/); 208 } 209 210 /// SizeOf - Determine size of integer value in bytes. 211 /// 212 unsigned DIEInteger::SizeOf(AsmPrinter *AP, unsigned Form) const { 213 switch (Form) { 214 case dwarf::DW_FORM_flag: // Fall thru 215 case dwarf::DW_FORM_ref1: // Fall thru 216 case dwarf::DW_FORM_data1: return sizeof(int8_t); 217 case dwarf::DW_FORM_ref2: // Fall thru 218 case dwarf::DW_FORM_data2: return sizeof(int16_t); 219 case dwarf::DW_FORM_ref4: // Fall thru 220 case dwarf::DW_FORM_data4: return sizeof(int32_t); 221 case dwarf::DW_FORM_ref8: // Fall thru 222 case dwarf::DW_FORM_data8: return sizeof(int64_t); 223 case dwarf::DW_FORM_udata: return MCAsmInfo::getULEB128Size(Integer); 224 case dwarf::DW_FORM_sdata: return MCAsmInfo::getSLEB128Size(Integer); 225 case dwarf::DW_FORM_addr: return AP->getTargetData().getPointerSize(); 226 default: llvm_unreachable("DIE Value form not supported yet"); break; 227 } 228 return 0; 229 } 230 231 #ifndef NDEBUG 232 void DIEInteger::print(raw_ostream &O) { 233 O << "Int: " << (int64_t)Integer 234 << format(" 0x%llx", (unsigned long long)Integer); 235 } 236 #endif 237 238 //===----------------------------------------------------------------------===// 239 // DIEString Implementation 240 //===----------------------------------------------------------------------===// 241 242 /// EmitValue - Emit string value. 243 /// 244 void DIEString::EmitValue(AsmPrinter *AP, unsigned Form) const { 245 AP->OutStreamer.EmitBytes(Str, /*addrspace*/0); 246 // Emit nul terminator. 247 AP->OutStreamer.EmitIntValue(0, 1, /*addrspace*/0); 248 } 249 250 #ifndef NDEBUG 251 void DIEString::print(raw_ostream &O) { 252 O << "Str: \"" << Str << "\""; 253 } 254 #endif 255 256 //===----------------------------------------------------------------------===// 257 // DIELabel Implementation 258 //===----------------------------------------------------------------------===// 259 260 /// EmitValue - Emit label value. 261 /// 262 void DIELabel::EmitValue(AsmPrinter *AP, unsigned Form) const { 263 AP->OutStreamer.EmitSymbolValue(Label, SizeOf(AP, Form), 0/*AddrSpace*/); 264 } 265 266 /// SizeOf - Determine size of label value in bytes. 267 /// 268 unsigned DIELabel::SizeOf(AsmPrinter *AP, unsigned Form) const { 269 if (Form == dwarf::DW_FORM_data4) return 4; 270 return AP->getTargetData().getPointerSize(); 271 } 272 273 #ifndef NDEBUG 274 void DIELabel::print(raw_ostream &O) { 275 O << "Lbl: " << Label->getName(); 276 } 277 #endif 278 279 //===----------------------------------------------------------------------===// 280 // DIEDelta Implementation 281 //===----------------------------------------------------------------------===// 282 283 /// EmitValue - Emit delta value. 284 /// 285 void DIEDelta::EmitValue(AsmPrinter *AP, unsigned Form) const { 286 AP->EmitLabelDifference(LabelHi, LabelLo, SizeOf(AP, Form)); 287 } 288 289 /// SizeOf - Determine size of delta value in bytes. 290 /// 291 unsigned DIEDelta::SizeOf(AsmPrinter *AP, unsigned Form) const { 292 if (Form == dwarf::DW_FORM_data4) return 4; 293 return AP->getTargetData().getPointerSize(); 294 } 295 296 #ifndef NDEBUG 297 void DIEDelta::print(raw_ostream &O) { 298 O << "Del: " << LabelHi->getName() << "-" << LabelLo->getName(); 299 } 300 #endif 301 302 //===----------------------------------------------------------------------===// 303 // DIEEntry Implementation 304 //===----------------------------------------------------------------------===// 305 306 /// EmitValue - Emit debug information entry offset. 307 /// 308 void DIEEntry::EmitValue(AsmPrinter *AP, unsigned Form) const { 309 AP->EmitInt32(Entry->getOffset()); 310 } 311 312 #ifndef NDEBUG 313 void DIEEntry::print(raw_ostream &O) { 314 O << format("Die: 0x%lx", (long)(intptr_t)Entry); 315 } 316 #endif 317 318 //===----------------------------------------------------------------------===// 319 // DIEBlock Implementation 320 //===----------------------------------------------------------------------===// 321 322 /// ComputeSize - calculate the size of the block. 323 /// 324 unsigned DIEBlock::ComputeSize(AsmPrinter *AP) { 325 if (!Size) { 326 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev.getData(); 327 for (unsigned i = 0, N = Values.size(); i < N; ++i) 328 Size += Values[i]->SizeOf(AP, AbbrevData[i].getForm()); 329 } 330 331 return Size; 332 } 333 334 /// EmitValue - Emit block data. 335 /// 336 void DIEBlock::EmitValue(AsmPrinter *Asm, unsigned Form) const { 337 switch (Form) { 338 default: assert(0 && "Improper form for block"); break; 339 case dwarf::DW_FORM_block1: Asm->EmitInt8(Size); break; 340 case dwarf::DW_FORM_block2: Asm->EmitInt16(Size); break; 341 case dwarf::DW_FORM_block4: Asm->EmitInt32(Size); break; 342 case dwarf::DW_FORM_block: Asm->EmitULEB128(Size); break; 343 } 344 345 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev.getData(); 346 for (unsigned i = 0, N = Values.size(); i < N; ++i) 347 Values[i]->EmitValue(Asm, AbbrevData[i].getForm()); 348 } 349 350 /// SizeOf - Determine size of block data in bytes. 351 /// 352 unsigned DIEBlock::SizeOf(AsmPrinter *AP, unsigned Form) const { 353 switch (Form) { 354 case dwarf::DW_FORM_block1: return Size + sizeof(int8_t); 355 case dwarf::DW_FORM_block2: return Size + sizeof(int16_t); 356 case dwarf::DW_FORM_block4: return Size + sizeof(int32_t); 357 case dwarf::DW_FORM_block: return Size + MCAsmInfo::getULEB128Size(Size); 358 default: llvm_unreachable("Improper form for block"); break; 359 } 360 return 0; 361 } 362 363 #ifndef NDEBUG 364 void DIEBlock::print(raw_ostream &O) { 365 O << "Blk: "; 366 DIE::print(O, 5); 367 } 368 #endif 369
