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 "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