DIE.cpp revision e7099f6ff48ee99e50aa8347b455255e3a893a12
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 "DwarfDebug.h" 16#include "llvm/ADT/Twine.h" 17#include "llvm/CodeGen/AsmPrinter.h" 18#include "llvm/IR/DataLayout.h" 19#include "llvm/MC/MCAsmInfo.h" 20#include "llvm/MC/MCStreamer.h" 21#include "llvm/MC/MCSymbol.h" 22#include "llvm/Support/Allocator.h" 23#include "llvm/Support/Debug.h" 24#include "llvm/Support/ErrorHandling.h" 25#include "llvm/Support/Format.h" 26#include "llvm/Support/FormattedStream.h" 27#include "llvm/Support/MD5.h" 28using namespace llvm; 29 30//===----------------------------------------------------------------------===// 31// DIEAbbrevData Implementation 32//===----------------------------------------------------------------------===// 33 34/// Profile - Used to gather unique data for the abbreviation folding set. 35/// 36void DIEAbbrevData::Profile(FoldingSetNodeID &ID) const { 37 ID.AddInteger(Attribute); 38 ID.AddInteger(Form); 39} 40 41//===----------------------------------------------------------------------===// 42// DIEAbbrev Implementation 43//===----------------------------------------------------------------------===// 44 45/// Profile - Used to gather unique data for the abbreviation folding set. 46/// 47void DIEAbbrev::Profile(FoldingSetNodeID &ID) const { 48 ID.AddInteger(Tag); 49 ID.AddInteger(ChildrenFlag); 50 51 // For each attribute description. 52 for (unsigned i = 0, N = Data.size(); i < N; ++i) 53 Data[i].Profile(ID); 54} 55 56/// Emit - Print the abbreviation using the specified asm printer. 57/// 58void DIEAbbrev::Emit(AsmPrinter *AP) const { 59 // Emit its Dwarf tag type. 60 AP->EmitULEB128(Tag, dwarf::TagString(Tag)); 61 62 // Emit whether it has children DIEs. 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 AP->EmitULEB128(AttrData.getAttribute(), 71 dwarf::AttributeString(AttrData.getAttribute())); 72 73 // Emit form type. 74 AP->EmitULEB128(AttrData.getForm(), 75 dwarf::FormEncodingString(AttrData.getForm())); 76 } 77 78 // Mark end of abbreviation. 79 AP->EmitULEB128(0, "EOM(1)"); 80 AP->EmitULEB128(0, "EOM(2)"); 81} 82 83#ifndef NDEBUG 84void DIEAbbrev::print(raw_ostream &O) { 85 O << "Abbreviation @" 86 << format("0x%lx", (long)(intptr_t)this) 87 << " " 88 << dwarf::TagString(Tag) 89 << " " 90 << dwarf::ChildrenString(ChildrenFlag) 91 << '\n'; 92 93 for (unsigned i = 0, N = Data.size(); i < N; ++i) { 94 O << " " 95 << dwarf::AttributeString(Data[i].getAttribute()) 96 << " " 97 << dwarf::FormEncodingString(Data[i].getForm()) 98 << '\n'; 99 } 100} 101void DIEAbbrev::dump() { print(dbgs()); } 102#endif 103 104//===----------------------------------------------------------------------===// 105// DIE Implementation 106//===----------------------------------------------------------------------===// 107 108DIE::~DIE() { 109 for (unsigned i = 0, N = Children.size(); i < N; ++i) 110 delete Children[i]; 111} 112 113DIEValue *DIE::findAttribute(uint16_t Attribute) { 114 const SmallVectorImpl<DIEValue *> &Values = getValues(); 115 const DIEAbbrev &Abbrevs = getAbbrev(); 116 117 // Iterate through all the attributes until we find the one we're 118 // looking for, if we can't find it return NULL. 119 for (size_t i = 0; i < Values.size(); ++i) 120 if (Abbrevs.getData()[i].getAttribute() == Attribute) 121 return Values[i]; 122 return NULL; 123} 124 125#ifndef NDEBUG 126void DIE::print(raw_ostream &O, unsigned IndentCount) const { 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 SmallVectorImpl<DIEAbbrevData> &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, IndentCount+4); 166 } 167 168 if (!isBlock) O << "\n"; 169} 170 171void DIE::dump() { 172 print(dbgs()); 173} 174#endif 175 176void DIEValue::anchor() { } 177 178#ifndef NDEBUG 179void DIEValue::dump() const { 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, uint16_t Form) const { 191 unsigned Size = ~0U; 192 switch (Form) { 193 case dwarf::DW_FORM_flag_present: 194 // Emit something to keep the lines and comments in sync. 195 // FIXME: Is there a better way to do this? 196 if (Asm->OutStreamer.hasRawTextSupport()) 197 Asm->OutStreamer.EmitRawText(StringRef("")); 198 return; 199 case dwarf::DW_FORM_flag: // Fall thru 200 case dwarf::DW_FORM_ref1: // Fall thru 201 case dwarf::DW_FORM_data1: Size = 1; break; 202 case dwarf::DW_FORM_ref2: // Fall thru 203 case dwarf::DW_FORM_data2: Size = 2; break; 204 case dwarf::DW_FORM_sec_offset: // Fall thru 205 case dwarf::DW_FORM_ref4: // Fall thru 206 case dwarf::DW_FORM_data4: Size = 4; break; 207 case dwarf::DW_FORM_ref8: // Fall thru 208 case dwarf::DW_FORM_data8: Size = 8; break; 209 case dwarf::DW_FORM_GNU_str_index: Asm->EmitULEB128(Integer); return; 210 case dwarf::DW_FORM_GNU_addr_index: Asm->EmitULEB128(Integer); return; 211 case dwarf::DW_FORM_udata: Asm->EmitULEB128(Integer); return; 212 case dwarf::DW_FORM_sdata: Asm->EmitSLEB128(Integer); return; 213 case dwarf::DW_FORM_addr: 214 Size = Asm->getDataLayout().getPointerSize(); break; 215 default: llvm_unreachable("DIE Value form not supported yet"); 216 } 217 Asm->OutStreamer.EmitIntValue(Integer, Size); 218} 219 220/// SizeOf - Determine size of integer value in bytes. 221/// 222unsigned DIEInteger::SizeOf(AsmPrinter *AP, uint16_t Form) const { 223 switch (Form) { 224 case dwarf::DW_FORM_flag_present: return 0; 225 case dwarf::DW_FORM_flag: // Fall thru 226 case dwarf::DW_FORM_ref1: // Fall thru 227 case dwarf::DW_FORM_data1: return sizeof(int8_t); 228 case dwarf::DW_FORM_ref2: // Fall thru 229 case dwarf::DW_FORM_data2: return sizeof(int16_t); 230 case dwarf::DW_FORM_sec_offset: // Fall thru 231 case dwarf::DW_FORM_ref4: // Fall thru 232 case dwarf::DW_FORM_data4: return sizeof(int32_t); 233 case dwarf::DW_FORM_ref8: // Fall thru 234 case dwarf::DW_FORM_data8: return sizeof(int64_t); 235 case dwarf::DW_FORM_GNU_str_index: return MCAsmInfo::getULEB128Size(Integer); 236 case dwarf::DW_FORM_GNU_addr_index: return MCAsmInfo::getULEB128Size(Integer); 237 case dwarf::DW_FORM_udata: return MCAsmInfo::getULEB128Size(Integer); 238 case dwarf::DW_FORM_sdata: return MCAsmInfo::getSLEB128Size(Integer); 239 case dwarf::DW_FORM_addr: return AP->getDataLayout().getPointerSize(); 240 default: llvm_unreachable("DIE Value form not supported yet"); 241 } 242} 243 244#ifndef NDEBUG 245void DIEInteger::print(raw_ostream &O) const { 246 O << "Int: " << (int64_t)Integer << " 0x"; 247 O.write_hex(Integer); 248} 249#endif 250 251//===----------------------------------------------------------------------===// 252// DIEExpr Implementation 253//===----------------------------------------------------------------------===// 254 255/// EmitValue - Emit expression value. 256/// 257void DIEExpr::EmitValue(AsmPrinter *AP, uint16_t Form) const { 258 AP->OutStreamer.EmitValue(Expr, SizeOf(AP, Form)); 259} 260 261/// SizeOf - Determine size of expression value in bytes. 262/// 263unsigned DIEExpr::SizeOf(AsmPrinter *AP, uint16_t Form) const { 264 if (Form == dwarf::DW_FORM_data4) return 4; 265 if (Form == dwarf::DW_FORM_sec_offset) return 4; 266 if (Form == dwarf::DW_FORM_strp) return 4; 267 return AP->getDataLayout().getPointerSize(); 268} 269 270#ifndef NDEBUG 271void DIEExpr::print(raw_ostream &O) const { 272 O << "Expr: "; 273 Expr->print(O); 274} 275#endif 276 277//===----------------------------------------------------------------------===// 278// DIELabel Implementation 279//===----------------------------------------------------------------------===// 280 281/// EmitValue - Emit label value. 282/// 283void DIELabel::EmitValue(AsmPrinter *AP, uint16_t Form) const { 284 AP->EmitLabelReference(Label, SizeOf(AP, Form), Form == dwarf::DW_FORM_strp 285 || Form == dwarf::DW_FORM_sec_offset || Form == dwarf::DW_OP_call_ref 286 || Form == dwarf::DW_FORM_ref_addr); 287} 288 289/// SizeOf - Determine size of label value in bytes. 290/// 291unsigned DIELabel::SizeOf(AsmPrinter *AP, uint16_t Form) const { 292 if (Form == dwarf::DW_FORM_data4) return 4; 293 if (Form == dwarf::DW_FORM_sec_offset) return 4; 294 if (Form == dwarf::DW_FORM_strp) return 4; 295 return AP->getDataLayout().getPointerSize(); 296} 297 298#ifndef NDEBUG 299void DIELabel::print(raw_ostream &O) const { 300 O << "Lbl: " << Label->getName(); 301} 302#endif 303 304//===----------------------------------------------------------------------===// 305// DIEDelta Implementation 306//===----------------------------------------------------------------------===// 307 308/// EmitValue - Emit delta value. 309/// 310void DIEDelta::EmitValue(AsmPrinter *AP, uint16_t Form) const { 311 AP->EmitLabelDifference(LabelHi, LabelLo, SizeOf(AP, Form)); 312} 313 314/// SizeOf - Determine size of delta value in bytes. 315/// 316unsigned DIEDelta::SizeOf(AsmPrinter *AP, uint16_t Form) const { 317 if (Form == dwarf::DW_FORM_data4) return 4; 318 if (Form == dwarf::DW_FORM_strp) return 4; 319 return AP->getDataLayout().getPointerSize(); 320} 321 322#ifndef NDEBUG 323void DIEDelta::print(raw_ostream &O) const { 324 O << "Del: " << LabelHi->getName() << "-" << LabelLo->getName(); 325} 326#endif 327 328//===----------------------------------------------------------------------===// 329// DIEString Implementation 330//===----------------------------------------------------------------------===// 331 332/// EmitValue - Emit string value. 333/// 334void DIEString::EmitValue(AsmPrinter *AP, uint16_t Form) const { 335 Access->EmitValue(AP, Form); 336} 337 338/// SizeOf - Determine size of delta value in bytes. 339/// 340unsigned DIEString::SizeOf(AsmPrinter *AP, uint16_t Form) const { 341 return Access->SizeOf(AP, Form); 342} 343 344#ifndef NDEBUG 345void DIEString::print(raw_ostream &O) const { 346 O << "String: " << Str << "\tSymbol: "; 347 Access->print(O); 348} 349#endif 350 351//===----------------------------------------------------------------------===// 352// DIEEntry Implementation 353//===----------------------------------------------------------------------===// 354 355/// EmitValue - Emit debug information entry offset. 356/// 357void DIEEntry::EmitValue(AsmPrinter *AP, uint16_t Form) const { 358 AP->EmitInt32(Entry->getOffset()); 359} 360 361unsigned DIEEntry::getRefAddrSize(AsmPrinter *AP) { 362 // DWARF4: References that use the attribute form DW_FORM_ref_addr are 363 // specified to be four bytes in the DWARF 32-bit format and eight bytes 364 // in the DWARF 64-bit format, while DWARF Version 2 specifies that such 365 // references have the same size as an address on the target system. 366 if (AP->getDwarfDebug()->getDwarfVersion() == 2) 367 return AP->getDataLayout().getPointerSize(); 368 return sizeof(int32_t); 369} 370 371#ifndef NDEBUG 372void DIEEntry::print(raw_ostream &O) const { 373 O << format("Die: 0x%lx", (long)(intptr_t)Entry); 374} 375#endif 376 377//===----------------------------------------------------------------------===// 378// DIEBlock Implementation 379//===----------------------------------------------------------------------===// 380 381/// ComputeSize - calculate the size of the block. 382/// 383unsigned DIEBlock::ComputeSize(AsmPrinter *AP) { 384 if (!Size) { 385 const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData(); 386 for (unsigned i = 0, N = Values.size(); i < N; ++i) 387 Size += Values[i]->SizeOf(AP, AbbrevData[i].getForm()); 388 } 389 390 return Size; 391} 392 393/// EmitValue - Emit block data. 394/// 395void DIEBlock::EmitValue(AsmPrinter *Asm, uint16_t Form) const { 396 switch (Form) { 397 default: llvm_unreachable("Improper form for block"); 398 case dwarf::DW_FORM_block1: Asm->EmitInt8(Size); break; 399 case dwarf::DW_FORM_block2: Asm->EmitInt16(Size); break; 400 case dwarf::DW_FORM_block4: Asm->EmitInt32(Size); break; 401 case dwarf::DW_FORM_block: Asm->EmitULEB128(Size); break; 402 } 403 404 const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData(); 405 for (unsigned i = 0, N = Values.size(); i < N; ++i) 406 Values[i]->EmitValue(Asm, AbbrevData[i].getForm()); 407} 408 409/// SizeOf - Determine size of block data in bytes. 410/// 411unsigned DIEBlock::SizeOf(AsmPrinter *AP, uint16_t Form) const { 412 switch (Form) { 413 case dwarf::DW_FORM_block1: return Size + sizeof(int8_t); 414 case dwarf::DW_FORM_block2: return Size + sizeof(int16_t); 415 case dwarf::DW_FORM_block4: return Size + sizeof(int32_t); 416 case dwarf::DW_FORM_block: return Size + MCAsmInfo::getULEB128Size(Size); 417 default: llvm_unreachable("Improper form for block"); 418 } 419} 420 421#ifndef NDEBUG 422void DIEBlock::print(raw_ostream &O) const { 423 O << "Blk: "; 424 DIE::print(O, 5); 425} 426#endif 427