DIE.cpp revision d38fee8ddc6597555904b82b6471a446cc5fe183
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" 26using namespace llvm; 27 28//===----------------------------------------------------------------------===// 29// DIEAbbrevData Implementation 30//===----------------------------------------------------------------------===// 31 32/// Profile - Used to gather unique data for the abbreviation folding set. 33/// 34void 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/// 45void 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/// 56void 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 86void 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} 103void DIEAbbrev::dump() { print(dbgs()); } 104#endif 105 106//===----------------------------------------------------------------------===// 107// DIE Implementation 108//===----------------------------------------------------------------------===// 109 110DIE::~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/// 117DIEValue *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 125void 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 172void DIE::dump() { 173 print(dbgs()); 174} 175#endif 176 177 178#ifndef NDEBUG 179void DIEValue::dump() { 180 print(dbgs()); 181} 182#endif 183 184//===----------------------------------------------------------------------===// 185// DIEInteger Implementation 186//===----------------------------------------------------------------------===// 187 188/// EmitValue - Emit integer of appropriate size. 189/// 190void 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 default: llvm_unreachable("DIE Value form not supported yet"); 205 } 206 Asm->OutStreamer.EmitIntValue(Integer, Size, 0/*addrspace*/); 207} 208 209/// SizeOf - Determine size of integer value in bytes. 210/// 211unsigned DIEInteger::SizeOf(const TargetData *TD, unsigned Form) const { 212 switch (Form) { 213 case dwarf::DW_FORM_flag: // Fall thru 214 case dwarf::DW_FORM_ref1: // Fall thru 215 case dwarf::DW_FORM_data1: return sizeof(int8_t); 216 case dwarf::DW_FORM_ref2: // Fall thru 217 case dwarf::DW_FORM_data2: return sizeof(int16_t); 218 case dwarf::DW_FORM_ref4: // Fall thru 219 case dwarf::DW_FORM_data4: return sizeof(int32_t); 220 case dwarf::DW_FORM_ref8: // Fall thru 221 case dwarf::DW_FORM_data8: return sizeof(int64_t); 222 case dwarf::DW_FORM_udata: return MCAsmInfo::getULEB128Size(Integer); 223 case dwarf::DW_FORM_sdata: return MCAsmInfo::getSLEB128Size(Integer); 224 default: llvm_unreachable("DIE Value form not supported yet"); break; 225 } 226 return 0; 227} 228 229#ifndef NDEBUG 230void DIEInteger::print(raw_ostream &O) { 231 O << "Int: " << (int64_t)Integer 232 << format(" 0x%llx", (unsigned long long)Integer); 233} 234#endif 235 236//===----------------------------------------------------------------------===// 237// DIEString Implementation 238//===----------------------------------------------------------------------===// 239 240/// EmitValue - Emit string value. 241/// 242void DIEString::EmitValue(AsmPrinter *AP, unsigned Form) const { 243 AP->OutStreamer.EmitBytes(Str, /*addrspace*/0); 244 // Emit nul terminator. 245 AP->OutStreamer.EmitIntValue(0, 1, /*addrspace*/0); 246} 247 248#ifndef NDEBUG 249void DIEString::print(raw_ostream &O) { 250 O << "Str: \"" << Str << "\""; 251} 252#endif 253 254//===----------------------------------------------------------------------===// 255// DIELabel Implementation 256//===----------------------------------------------------------------------===// 257 258/// EmitValue - Emit label value. 259/// 260void DIELabel::EmitValue(AsmPrinter *AP, unsigned Form) const { 261 bool IsSmall = Form == dwarf::DW_FORM_data4; 262 unsigned Size = IsSmall ? 4 : AP->getTargetData().getPointerSize(); 263 AP->OutStreamer.EmitSymbolValue(Label, Size, 0/*AddrSpace*/); 264} 265 266/// SizeOf - Determine size of label value in bytes. 267/// 268unsigned DIELabel::SizeOf(const TargetData *TD, unsigned Form) const { 269 if (Form == dwarf::DW_FORM_data4) return 4; 270 return TD->getPointerSize(); 271} 272 273#ifndef NDEBUG 274void 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/// 285void DIEDelta::EmitValue(AsmPrinter *AP, unsigned Form) const { 286 AP->EmitLabelDifference(LabelHi, LabelLo, 287 SizeOf(&AP->getTargetData(), Form)); 288} 289 290/// SizeOf - Determine size of delta value in bytes. 291/// 292unsigned DIEDelta::SizeOf(const TargetData *TD, unsigned Form) const { 293 if (Form == dwarf::DW_FORM_data4) return 4; 294 return TD->getPointerSize(); 295} 296 297#ifndef NDEBUG 298void DIEDelta::print(raw_ostream &O) { 299 O << "Del: " << LabelHi->getName() << "-" << LabelLo->getName(); 300} 301#endif 302 303//===----------------------------------------------------------------------===// 304// DIEEntry Implementation 305//===----------------------------------------------------------------------===// 306 307/// EmitValue - Emit debug information entry offset. 308/// 309void DIEEntry::EmitValue(AsmPrinter *AP, unsigned Form) const { 310 AP->EmitInt32(Entry->getOffset()); 311} 312 313#ifndef NDEBUG 314void DIEEntry::print(raw_ostream &O) { 315 O << format("Die: 0x%lx", (long)(intptr_t)Entry); 316} 317#endif 318 319//===----------------------------------------------------------------------===// 320// DIEBlock Implementation 321//===----------------------------------------------------------------------===// 322 323/// ComputeSize - calculate the size of the block. 324/// 325unsigned DIEBlock::ComputeSize(const TargetData *TD) { 326 if (!Size) { 327 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev.getData(); 328 for (unsigned i = 0, N = Values.size(); i < N; ++i) 329 Size += Values[i]->SizeOf(TD, AbbrevData[i].getForm()); 330 } 331 332 return Size; 333} 334 335/// EmitValue - Emit block data. 336/// 337void DIEBlock::EmitValue(AsmPrinter *Asm, unsigned Form) const { 338 switch (Form) { 339 default: assert(0 && "Improper form for block"); break; 340 case dwarf::DW_FORM_block1: Asm->EmitInt8(Size); break; 341 case dwarf::DW_FORM_block2: Asm->EmitInt16(Size); break; 342 case dwarf::DW_FORM_block4: Asm->EmitInt32(Size); break; 343 case dwarf::DW_FORM_block: Asm->EmitULEB128(Size); break; 344 } 345 346 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev.getData(); 347 for (unsigned i = 0, N = Values.size(); i < N; ++i) 348 Values[i]->EmitValue(Asm, AbbrevData[i].getForm()); 349} 350 351/// SizeOf - Determine size of block data in bytes. 352/// 353unsigned DIEBlock::SizeOf(const TargetData *TD, unsigned Form) const { 354 switch (Form) { 355 case dwarf::DW_FORM_block1: return Size + sizeof(int8_t); 356 case dwarf::DW_FORM_block2: return Size + sizeof(int16_t); 357 case dwarf::DW_FORM_block4: return Size + sizeof(int32_t); 358 case dwarf::DW_FORM_block: return Size + MCAsmInfo::getULEB128Size(Size); 359 default: llvm_unreachable("Improper form for block"); break; 360 } 361 return 0; 362} 363 364#ifndef NDEBUG 365void DIEBlock::print(raw_ostream &O) { 366 O << "Blk: "; 367 DIE::print(O, 5); 368} 369#endif 370