src/llvm/lib/CodeGen/AsmPrinter/DIE.cpp

   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 "llvm/CodeGen/DIE.h"
  15 #include "DwarfCompileUnit.h"
  16 #include "DwarfDebug.h"
  17 #include "DwarfUnit.h"
  18 #include "llvm/ADT/Twine.h"
  19 #include "llvm/CodeGen/AsmPrinter.h"
  20 #include "llvm/IR/DataLayout.h"
  21 #include "llvm/MC/MCAsmInfo.h"
  22 #include "llvm/MC/MCContext.h"
  23 #include "llvm/MC/MCStreamer.h"
  24 #include "llvm/MC/MCSymbol.h"
  25 #include "llvm/Support/Debug.h"
  26 #include "llvm/Support/ErrorHandling.h"
  27 #include "llvm/Support/Format.h"
  28 #include "llvm/Support/FormattedStream.h"
  29 #include "llvm/Support/LEB128.h"
  30 #include "llvm/Support/MD5.h"
  31 using namespace llvm;
  32
  33 //===----------------------------------------------------------------------===//
  34 // DIEAbbrevData Implementation
  35 //===----------------------------------------------------------------------===//
  36
  37 /// Profile - Used to gather unique data for the abbreviation folding set.
  38 ///
  39 void DIEAbbrevData::Profile(FoldingSetNodeID &ID) const {
  40   // Explicitly cast to an integer type for which FoldingSetNodeID has
  41   // overloads.  Otherwise MSVC 2010 thinks this call is ambiguous.
  42   ID.AddInteger(unsigned(Attribute));
  43   ID.AddInteger(unsigned(Form));
  44 }
  45
  46 //===----------------------------------------------------------------------===//
  47 // DIEAbbrev Implementation
  48 //===----------------------------------------------------------------------===//
  49
  50 /// Profile - Used to gather unique data for the abbreviation folding set.
  51 ///
  52 void DIEAbbrev::Profile(FoldingSetNodeID &ID) const {
  53   ID.AddInteger(unsigned(Tag));
  54   ID.AddInteger(unsigned(Children));
  55
  56   // For each attribute description.
  57   for (unsigned i = 0, N = Data.size(); i < N; ++i)
  58     Data[i].Profile(ID);
  59 }
  60
  61 /// Emit - Print the abbreviation using the specified asm printer.
  62 ///
  63 void DIEAbbrev::Emit(AsmPrinter *AP) const {
  64   // Emit its Dwarf tag type.
  65   AP->EmitULEB128(Tag, dwarf::TagString(Tag));
  66
  67   // Emit whether it has children DIEs.
  68   AP->EmitULEB128((unsigned)Children, dwarf::ChildrenString(Children));
  69
  70   // For each attribute description.
  71   for (unsigned i = 0, N = Data.size(); i < N; ++i) {
  72     const DIEAbbrevData &AttrData = Data[i];
  73
  74     // Emit attribute type.
  75     AP->EmitULEB128(AttrData.getAttribute(),
  76                     dwarf::AttributeString(AttrData.getAttribute()));
  77
  78     // Emit form type.
  79     AP->EmitULEB128(AttrData.getForm(),
  80                     dwarf::FormEncodingString(AttrData.getForm()));
  81   }
  82
  83   // Mark end of abbreviation.
  84   AP->EmitULEB128(0, "EOM(1)");
  85   AP->EmitULEB128(0, "EOM(2)");
  86 }
  87
  88 #ifndef NDEBUG
  89 void DIEAbbrev::print(raw_ostream &O) {
  90   O << "Abbreviation @"
  91     << format("0x%lx", (long)(intptr_t)this)
  92     << "  "
  93     << dwarf::TagString(Tag)
  94     << " "
  95     << dwarf::ChildrenString(Children)
  96     << '\n';
  97
  98   for (unsigned i = 0, N = Data.size(); i < N; ++i) {
  99     O << "  "
 100       << dwarf::AttributeString(Data[i].getAttribute())
 101       << "  "
 102       << dwarf::FormEncodingString(Data[i].getForm())
 103       << '\n';
 104   }
 105 }
 106 void DIEAbbrev::dump() { print(dbgs()); }
 107 #endif
 108
 109 /// Climb up the parent chain to get the unit DIE to which this DIE
 110 /// belongs.
 111 const DIE *DIE::getUnit() const {
 112   const DIE *Cu = getUnitOrNull();
 113   assert(Cu && "We should not have orphaned DIEs.");
 114   return Cu;
 115 }
 116
 117 /// Climb up the parent chain to get the unit DIE this DIE belongs
 118 /// to. Return NULL if DIE is not added to an owner yet.
 119 const DIE *DIE::getUnitOrNull() const {
 120   const DIE *p = this;
 121   while (p) {
 122     if (p->getTag() == dwarf::DW_TAG_compile_unit ||
 123         p->getTag() == dwarf::DW_TAG_type_unit)
 124       return p;
 125     p = p->getParent();
 126   }
 127   return nullptr;
 128 }
 129
 130 DIEValue *DIE::findAttribute(dwarf::Attribute Attribute) const {
 131   const SmallVectorImpl<DIEValue *> &Values = getValues();
 132   const DIEAbbrev &Abbrevs = getAbbrev();
 133
 134   // Iterate through all the attributes until we find the one we're
 135   // looking for, if we can't find it return NULL.
 136   for (size_t i = 0; i < Values.size(); ++i)
 137     if (Abbrevs.getData()[i].getAttribute() == Attribute)
 138       return Values[i];
 139   return nullptr;
 140 }
 141
 142 #ifndef NDEBUG
 143 void DIE::print(raw_ostream &O, unsigned IndentCount) const {
 144   const std::string Indent(IndentCount, ' ');
 145   bool isBlock = Abbrev.getTag() == 0;
 146
 147   if (!isBlock) {
 148     O << Indent
 149       << "Die: "
 150       << format("0x%lx", (long)(intptr_t)this)
 151       << ", Offset: " << Offset
 152       << ", Size: " << Size << "\n";
 153
 154     O << Indent
 155       << dwarf::TagString(Abbrev.getTag())
 156       << " "
 157       << dwarf::ChildrenString(Abbrev.hasChildren()) << "\n";
 158   } else {
 159     O << "Size: " << Size << "\n";
 160   }
 161
 162   const SmallVectorImpl<DIEAbbrevData> &Data = Abbrev.getData();
 163
 164   IndentCount += 2;
 165   for (unsigned i = 0, N = Data.size(); i < N; ++i) {
 166     O << Indent;
 167
 168     if (!isBlock)
 169       O << dwarf::AttributeString(Data[i].getAttribute());
 170     else
 171       O << "Blk[" << i << "]";
 172
 173     O <<  "  "
 174       << dwarf::FormEncodingString(Data[i].getForm())
 175       << " ";
 176     Values[i]->print(O);
 177     O << "\n";
 178   }
 179   IndentCount -= 2;
 180
 181   for (unsigned j = 0, M = Children.size(); j < M; ++j) {
 182     Children[j]->print(O, IndentCount+4);
 183   }
 184
 185   if (!isBlock) O << "\n";
 186 }
 187
 188 void DIE::dump() {
 189   print(dbgs());
 190 }
 191 #endif
 192
 193 void DIEValue::anchor() { }
 194
 195 #ifndef NDEBUG
 196 void DIEValue::dump() const {
 197   print(dbgs());
 198 }
 199 #endif
 200
 201 //===----------------------------------------------------------------------===//
 202 // DIEInteger Implementation
 203 //===----------------------------------------------------------------------===//
 204
 205 /// EmitValue - Emit integer of appropriate size.
 206 ///
 207 void DIEInteger::EmitValue(AsmPrinter *Asm, dwarf::Form Form) const {
 208   unsigned Size = ~0U;
 209   switch (Form) {
 210   case dwarf::DW_FORM_flag_present:
 211     // Emit something to keep the lines and comments in sync.
 212     // FIXME: Is there a better way to do this?
 213     Asm->OutStreamer.AddBlankLine();
 214     return;
 215   case dwarf::DW_FORM_flag:  // Fall thru
 216   case dwarf::DW_FORM_ref1:  // Fall thru
 217   case dwarf::DW_FORM_data1: Size = 1; break;
 218   case dwarf::DW_FORM_ref2:  // Fall thru
 219   case dwarf::DW_FORM_data2: Size = 2; break;
 220   case dwarf::DW_FORM_sec_offset: // Fall thru
 221   case dwarf::DW_FORM_ref4:  // Fall thru
 222   case dwarf::DW_FORM_data4: Size = 4; break;
 223   case dwarf::DW_FORM_ref8:  // Fall thru
 224   case dwarf::DW_FORM_ref_sig8:  // Fall thru
 225   case dwarf::DW_FORM_data8: Size = 8; break;
 226   case dwarf::DW_FORM_GNU_str_index: Asm->EmitULEB128(Integer); return;
 227   case dwarf::DW_FORM_GNU_addr_index: Asm->EmitULEB128(Integer); return;
 228   case dwarf::DW_FORM_udata: Asm->EmitULEB128(Integer); return;
 229   case dwarf::DW_FORM_sdata: Asm->EmitSLEB128(Integer); return;
 230   case dwarf::DW_FORM_addr:
 231     Size = Asm->getDataLayout().getPointerSize(); break;
 232   default: llvm_unreachable("DIE Value form not supported yet");
 233   }
 234   Asm->OutStreamer.EmitIntValue(Integer, Size);
 235 }
 236
 237 /// SizeOf - Determine size of integer value in bytes.
 238 ///
 239 unsigned DIEInteger::SizeOf(AsmPrinter *AP, dwarf::Form Form) const {
 240   switch (Form) {
 241   case dwarf::DW_FORM_flag_present: return 0;
 242   case dwarf::DW_FORM_flag:  // Fall thru
 243   case dwarf::DW_FORM_ref1:  // Fall thru
 244   case dwarf::DW_FORM_data1: return sizeof(int8_t);
 245   case dwarf::DW_FORM_ref2:  // Fall thru
 246   case dwarf::DW_FORM_data2: return sizeof(int16_t);
 247   case dwarf::DW_FORM_sec_offset: // Fall thru
 248   case dwarf::DW_FORM_ref4:  // Fall thru
 249   case dwarf::DW_FORM_data4: return sizeof(int32_t);
 250   case dwarf::DW_FORM_ref8:  // Fall thru
 251   case dwarf::DW_FORM_ref_sig8:  // Fall thru
 252   case dwarf::DW_FORM_data8: return sizeof(int64_t);
 253   case dwarf::DW_FORM_GNU_str_index: return getULEB128Size(Integer);
 254   case dwarf::DW_FORM_GNU_addr_index: return getULEB128Size(Integer);
 255   case dwarf::DW_FORM_udata: return getULEB128Size(Integer);
 256   case dwarf::DW_FORM_sdata: return getSLEB128Size(Integer);
 257   case dwarf::DW_FORM_addr:  return AP->getDataLayout().getPointerSize();
 258   default: llvm_unreachable("DIE Value form not supported yet");
 259   }
 260 }
 261
 262 #ifndef NDEBUG
 263 void DIEInteger::print(raw_ostream &O) const {
 264   O << "Int: " << (int64_t)Integer << "  0x";
 265   O.write_hex(Integer);
 266 }
 267 #endif
 268
 269 //===----------------------------------------------------------------------===//
 270 // DIEExpr Implementation
 271 //===----------------------------------------------------------------------===//
 272
 273 /// EmitValue - Emit expression value.
 274 ///
 275 void DIEExpr::EmitValue(AsmPrinter *AP, dwarf::Form Form) const {
 276   AP->OutStreamer.EmitValue(Expr, SizeOf(AP, Form));
 277 }
 278
 279 /// SizeOf - Determine size of expression value in bytes.
 280 ///
 281 unsigned DIEExpr::SizeOf(AsmPrinter *AP, dwarf::Form Form) const {
 282   if (Form == dwarf::DW_FORM_data4) return 4;
 283   if (Form == dwarf::DW_FORM_sec_offset) return 4;
 284   if (Form == dwarf::DW_FORM_strp) return 4;
 285   return AP->getDataLayout().getPointerSize();
 286 }
 287
 288 #ifndef NDEBUG
 289 void DIEExpr::print(raw_ostream &O) const {
 290   O << "Expr: ";
 291   Expr->print(O);
 292 }
 293 #endif
 294
 295 //===----------------------------------------------------------------------===//
 296 // DIELabel Implementation
 297 //===----------------------------------------------------------------------===//
 298
 299 /// EmitValue - Emit label value.
 300 ///
 301 void DIELabel::EmitValue(AsmPrinter *AP, dwarf::Form Form) const {
 302   AP->EmitLabelReference(Label, SizeOf(AP, Form),
 303                          Form == dwarf::DW_FORM_strp ||
 304                              Form == dwarf::DW_FORM_sec_offset ||
 305                              Form == dwarf::DW_FORM_ref_addr);
 306 }
 307
 308 /// SizeOf - Determine size of label value in bytes.
 309 ///
 310 unsigned DIELabel::SizeOf(AsmPrinter *AP, dwarf::Form Form) const {
 311   if (Form == dwarf::DW_FORM_data4) return 4;
 312   if (Form == dwarf::DW_FORM_sec_offset) return 4;
 313   if (Form == dwarf::DW_FORM_strp) return 4;
 314   return AP->getDataLayout().getPointerSize();
 315 }
 316
 317 #ifndef NDEBUG
 318 void DIELabel::print(raw_ostream &O) const {
 319   O << "Lbl: " << Label->getName();
 320 }
 321 #endif
 322
 323 //===----------------------------------------------------------------------===//
 324 // DIEDelta Implementation
 325 //===----------------------------------------------------------------------===//
 326
 327 /// EmitValue - Emit delta value.
 328 ///
 329 void DIEDelta::EmitValue(AsmPrinter *AP, dwarf::Form Form) const {
 330   AP->EmitLabelDifference(LabelHi, LabelLo, SizeOf(AP, Form));
 331 }
 332
 333 /// SizeOf - Determine size of delta value in bytes.
 334 ///
 335 unsigned DIEDelta::SizeOf(AsmPrinter *AP, dwarf::Form Form) const {
 336   if (Form == dwarf::DW_FORM_data4) return 4;
 337   if (Form == dwarf::DW_FORM_sec_offset) return 4;
 338   if (Form == dwarf::DW_FORM_strp) return 4;
 339   return AP->getDataLayout().getPointerSize();
 340 }
 341
 342 #ifndef NDEBUG
 343 void DIEDelta::print(raw_ostream &O) const {
 344   O << "Del: " << LabelHi->getName() << "-" << LabelLo->getName();
 345 }
 346 #endif
 347
 348 //===----------------------------------------------------------------------===//
 349 // DIEString Implementation
 350 //===----------------------------------------------------------------------===//
 351
 352 /// EmitValue - Emit string value.
 353 ///
 354 void DIEString::EmitValue(AsmPrinter *AP, dwarf::Form Form) const {
 355   Access->EmitValue(AP, Form);
 356 }
 357
 358 /// SizeOf - Determine size of delta value in bytes.
 359 ///
 360 unsigned DIEString::SizeOf(AsmPrinter *AP, dwarf::Form Form) const {
 361   return Access->SizeOf(AP, Form);
 362 }
 363
 364 #ifndef NDEBUG
 365 void DIEString::print(raw_ostream &O) const {
 366   O << "String: " << Str << "\tSymbol: ";
 367   Access->print(O);
 368 }
 369 #endif
 370
 371 //===----------------------------------------------------------------------===//
 372 // DIEEntry Implementation
 373 //===----------------------------------------------------------------------===//
 374
 375 /// Emit something like ".long Hi+Offset-Lo" where the size in bytes of the
 376 /// directive is specified by Size and Hi/Lo specify the labels.
 377 static void emitLabelOffsetDifference(MCStreamer &Streamer, const MCSymbol *Hi,
 378                                       uint64_t Offset, const MCSymbol *Lo,
 379                                       unsigned Size) {
 380   MCContext &Context = Streamer.getContext();
 381
 382   // Emit Hi+Offset - Lo
 383   // Get the Hi+Offset expression.
 384   const MCExpr *Plus =
 385       MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(Hi, Context),
 386                               MCConstantExpr::Create(Offset, Context), Context);
 387
 388   // Get the Hi+Offset-Lo expression.
 389   const MCExpr *Diff = MCBinaryExpr::CreateSub(
 390       Plus, MCSymbolRefExpr::Create(Lo, Context), Context);
 391
 392   // Otherwise, emit with .set (aka assignment).
 393   MCSymbol *SetLabel = Context.CreateTempSymbol();
 394   Streamer.EmitAssignment(SetLabel, Diff);
 395   Streamer.EmitSymbolValue(SetLabel, Size);
 396 }
 397
 398 /// EmitValue - Emit debug information entry offset.
 399 ///
 400 void DIEEntry::EmitValue(AsmPrinter *AP, dwarf::Form Form) const {
 401
 402   if (Form == dwarf::DW_FORM_ref_addr) {
 403     const DwarfDebug *DD = AP->getDwarfDebug();
 404     unsigned Addr = Entry.getOffset();
 405     assert(!DD->useSplitDwarf() && "TODO: dwo files can't have relocations.");
 406     // For DW_FORM_ref_addr, output the offset from beginning of debug info
 407     // section. Entry->getOffset() returns the offset from start of the
 408     // compile unit.
 409     DwarfCompileUnit *CU = DD->lookupUnit(Entry.getUnit());
 410     assert(CU && "CUDie should belong to a CU.");
 411     Addr += CU->getDebugInfoOffset();
 412     if (AP->MAI->doesDwarfUseRelocationsAcrossSections())
 413       AP->EmitLabelPlusOffset(CU->getSectionSym(), Addr,
 414                               DIEEntry::getRefAddrSize(AP));
 415     else
 416       emitLabelOffsetDifference(AP->OutStreamer, CU->getSectionSym(), Addr,
 417                                 CU->getSectionSym(),
 418                                 DIEEntry::getRefAddrSize(AP));
 419   } else
 420     AP->EmitInt32(Entry.getOffset());
 421 }
 422
 423 unsigned DIEEntry::getRefAddrSize(AsmPrinter *AP) {
 424   // DWARF4: References that use the attribute form DW_FORM_ref_addr are
 425   // specified to be four bytes in the DWARF 32-bit format and eight bytes
 426   // in the DWARF 64-bit format, while DWARF Version 2 specifies that such
 427   // references have the same size as an address on the target system.
 428   const DwarfDebug *DD = AP->getDwarfDebug();
 429   assert(DD && "Expected Dwarf Debug info to be available");
 430   if (DD->getDwarfVersion() == 2)
 431     return AP->getDataLayout().getPointerSize();
 432   return sizeof(int32_t);
 433 }
 434
 435 #ifndef NDEBUG
 436 void DIEEntry::print(raw_ostream &O) const {
 437   O << format("Die: 0x%lx", (long)(intptr_t)&Entry);
 438 }
 439 #endif
 440
 441 //===----------------------------------------------------------------------===//
 442 // DIETypeSignature Implementation
 443 //===----------------------------------------------------------------------===//
 444 void DIETypeSignature::EmitValue(AsmPrinter *Asm, dwarf::Form Form) const {
 445   assert(Form == dwarf::DW_FORM_ref_sig8);
 446   Asm->OutStreamer.EmitIntValue(Unit.getTypeSignature(), 8);
 447 }
 448
 449 #ifndef NDEBUG
 450 void DIETypeSignature::print(raw_ostream &O) const {
 451   O << format("Type Unit: 0x%lx", Unit.getTypeSignature());
 452 }
 453
 454 void DIETypeSignature::dump() const { print(dbgs()); }
 455 #endif
 456
 457 //===----------------------------------------------------------------------===//
 458 // DIELoc Implementation
 459 //===----------------------------------------------------------------------===//
 460
 461 /// ComputeSize - calculate the size of the location expression.
 462 ///
 463 unsigned DIELoc::ComputeSize(AsmPrinter *AP) const {
 464   if (!Size) {
 465     const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData();
 466     for (unsigned i = 0, N = Values.size(); i < N; ++i)
 467       Size += Values[i]->SizeOf(AP, AbbrevData[i].getForm());
 468   }
 469
 470   return Size;
 471 }
 472
 473 /// EmitValue - Emit location data.
 474 ///
 475 void DIELoc::EmitValue(AsmPrinter *Asm, dwarf::Form Form) const {
 476   switch (Form) {
 477   default: llvm_unreachable("Improper form for block");
 478   case dwarf::DW_FORM_block1: Asm->EmitInt8(Size);    break;
 479   case dwarf::DW_FORM_block2: Asm->EmitInt16(Size);   break;
 480   case dwarf::DW_FORM_block4: Asm->EmitInt32(Size);   break;
 481   case dwarf::DW_FORM_block:
 482   case dwarf::DW_FORM_exprloc:
 483     Asm->EmitULEB128(Size); break;
 484   }
 485
 486   const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData();
 487   for (unsigned i = 0, N = Values.size(); i < N; ++i)
 488     Values[i]->EmitValue(Asm, AbbrevData[i].getForm());
 489 }
 490
 491 /// SizeOf - Determine size of location data in bytes.
 492 ///
 493 unsigned DIELoc::SizeOf(AsmPrinter *AP, dwarf::Form Form) const {
 494   switch (Form) {
 495   case dwarf::DW_FORM_block1: return Size + sizeof(int8_t);
 496   case dwarf::DW_FORM_block2: return Size + sizeof(int16_t);
 497   case dwarf::DW_FORM_block4: return Size + sizeof(int32_t);
 498   case dwarf::DW_FORM_block:
 499   case dwarf::DW_FORM_exprloc:
 500     return Size + getULEB128Size(Size);
 501   default: llvm_unreachable("Improper form for block");
 502   }
 503 }
 504
 505 #ifndef NDEBUG
 506 void DIELoc::print(raw_ostream &O) const {
 507   O << "ExprLoc: ";
 508   DIE::print(O, 5);
 509 }
 510 #endif
 511
 512 //===----------------------------------------------------------------------===//
 513 // DIEBlock Implementation
 514 //===----------------------------------------------------------------------===//
 515
 516 /// ComputeSize - calculate the size of the block.
 517 ///
 518 unsigned DIEBlock::ComputeSize(AsmPrinter *AP) const {
 519   if (!Size) {
 520     const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData();
 521     for (unsigned i = 0, N = Values.size(); i < N; ++i)
 522       Size += Values[i]->SizeOf(AP, AbbrevData[i].getForm());
 523   }
 524
 525   return Size;
 526 }
 527
 528 /// EmitValue - Emit block data.
 529 ///
 530 void DIEBlock::EmitValue(AsmPrinter *Asm, dwarf::Form Form) const {
 531   switch (Form) {
 532   default: llvm_unreachable("Improper form for block");
 533   case dwarf::DW_FORM_block1: Asm->EmitInt8(Size);    break;
 534   case dwarf::DW_FORM_block2: Asm->EmitInt16(Size);   break;
 535   case dwarf::DW_FORM_block4: Asm->EmitInt32(Size);   break;
 536   case dwarf::DW_FORM_block:  Asm->EmitULEB128(Size); break;
 537   }
 538
 539   const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData();
 540   for (unsigned i = 0, N = Values.size(); i < N; ++i)
 541     Values[i]->EmitValue(Asm, AbbrevData[i].getForm());
 542 }
 543
 544 /// SizeOf - Determine size of block data in bytes.
 545 ///
 546 unsigned DIEBlock::SizeOf(AsmPrinter *AP, dwarf::Form Form) const {
 547   switch (Form) {
 548   case dwarf::DW_FORM_block1: return Size + sizeof(int8_t);
 549   case dwarf::DW_FORM_block2: return Size + sizeof(int16_t);
 550   case dwarf::DW_FORM_block4: return Size + sizeof(int32_t);
 551   case dwarf::DW_FORM_block:  return Size + getULEB128Size(Size);
 552   default: llvm_unreachable("Improper form for block");
 553   }
 554 }
 555
 556 #ifndef NDEBUG
 557 void DIEBlock::print(raw_ostream &O) const {
 558   O << "Blk: ";
 559   DIE::print(O, 5);
 560 }
 561 #endif
 562
 563 //===----------------------------------------------------------------------===//
 564 // DIELocList Implementation
 565 //===----------------------------------------------------------------------===//
 566
 567 unsigned DIELocList::SizeOf(AsmPrinter *AP, dwarf::Form Form) const {
 568   if (Form == dwarf::DW_FORM_data4)
 569     return 4;
 570   if (Form == dwarf::DW_FORM_sec_offset)
 571     return 4;
 572   return AP->getDataLayout().getPointerSize();
 573 }
 574
 575 /// EmitValue - Emit label value.
 576 ///
 577 void DIELocList::EmitValue(AsmPrinter *AP, dwarf::Form Form) const {
 578   DwarfDebug *DD = AP->getDwarfDebug();
 579   MCSymbol *Label = DD->getDebugLocEntries()[Index].Label;
 580
 581   if (AP->MAI->doesDwarfUseRelocationsAcrossSections() && !DD->useSplitDwarf())
 582     AP->EmitSectionOffset(Label, DD->getDebugLocSym());
 583   else
 584     AP->EmitLabelDifference(Label, DD->getDebugLocSym(), 4);
 585 }
 586
 587 #ifndef NDEBUG
 588 void DIELocList::print(raw_ostream &O) const {
 589   O << "LocList: " << Index;
 590
 591 }
 592 #endif