DIE.cpp revision 57578766aa33d1a22cd124316df318db3e44f34a
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 "DwarfPrinter.h" 16#include "llvm/ADT/Twine.h" 17#include "llvm/CodeGen/AsmPrinter.h" 18#include "llvm/MC/MCAsmInfo.h" 19#include "llvm/MC/MCStreamer.h" 20#include "llvm/MC/MCSymbol.h" 21#include "llvm/Target/TargetData.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(const DwarfPrinter *DP) const { 57 // Emit its Dwarf tag type. 58 // FIXME: Doing work even in non-asm-verbose runs. 59 DP->EmitULEB128(Tag, dwarf::TagString(Tag)); 60 61 // Emit whether it has children DIEs. 62 // FIXME: Doing work even in non-asm-verbose runs. 63 DP->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 DP->EmitULEB128(AttrData.getAttribute(), 72 dwarf::AttributeString(AttrData.getAttribute())); 73 74 // Emit form type. 75 // FIXME: Doing work even in non-asm-verbose runs. 76 DP->EmitULEB128(AttrData.getForm(), 77 dwarf::FormEncodingString(AttrData.getForm())); 78 } 79 80 // Mark end of abbreviation. 81 DP->EmitULEB128(0, "EOM(1)"); 82 DP->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/// 117void DIE::addSiblingOffset() { 118 DIEInteger *DI = new DIEInteger(0); 119 Values.insert(Values.begin(), DI); 120 Abbrev.AddFirstAttribute(dwarf::DW_AT_sibling, dwarf::DW_FORM_ref4); 121} 122 123#ifndef NDEBUG 124void DIE::print(raw_ostream &O, unsigned IncIndent) { 125 IndentCount += IncIndent; 126 const std::string Indent(IndentCount, ' '); 127 bool isBlock = Abbrev.getTag() == 0; 128 129 if (!isBlock) { 130 O << Indent 131 << "Die: " 132 << format("0x%lx", (long)(intptr_t)this) 133 << ", Offset: " << Offset 134 << ", Size: " << Size 135 << "\n"; 136 137 O << Indent 138 << dwarf::TagString(Abbrev.getTag()) 139 << " " 140 << dwarf::ChildrenString(Abbrev.getChildrenFlag()); 141 } else { 142 O << "Size: " << Size; 143 } 144 O << "\n"; 145 146 const SmallVector<DIEAbbrevData, 8> &Data = Abbrev.getData(); 147 148 IndentCount += 2; 149 for (unsigned i = 0, N = Data.size(); i < N; ++i) { 150 O << Indent; 151 152 if (!isBlock) 153 O << dwarf::AttributeString(Data[i].getAttribute()); 154 else 155 O << "Blk[" << i << "]"; 156 157 O << " " 158 << dwarf::FormEncodingString(Data[i].getForm()) 159 << " "; 160 Values[i]->print(O); 161 O << "\n"; 162 } 163 IndentCount -= 2; 164 165 for (unsigned j = 0, M = Children.size(); j < M; ++j) { 166 Children[j]->print(O, 4); 167 } 168 169 if (!isBlock) O << "\n"; 170 IndentCount -= IncIndent; 171} 172 173void DIE::dump() { 174 print(dbgs()); 175} 176#endif 177 178 179#ifndef NDEBUG 180void DIEValue::dump() { 181 print(dbgs()); 182} 183#endif 184 185//===----------------------------------------------------------------------===// 186// DIEInteger Implementation 187//===----------------------------------------------------------------------===// 188 189/// EmitValue - Emit integer of appropriate size. 190/// 191void DIEInteger::EmitValue(DwarfPrinter *D, unsigned Form) const { 192 const AsmPrinter *Asm = D->getAsm(); 193 unsigned Size = ~0U; 194 switch (Form) { 195 case dwarf::DW_FORM_flag: // Fall thru 196 case dwarf::DW_FORM_ref1: // Fall thru 197 case dwarf::DW_FORM_data1: Size = 1; break; 198 case dwarf::DW_FORM_ref2: // Fall thru 199 case dwarf::DW_FORM_data2: Size = 2; break; 200 case dwarf::DW_FORM_ref4: // Fall thru 201 case dwarf::DW_FORM_data4: Size = 4; break; 202 case dwarf::DW_FORM_ref8: // Fall thru 203 case dwarf::DW_FORM_data8: Size = 8; break; 204 case dwarf::DW_FORM_udata: D->EmitULEB128(Integer); return; 205 case dwarf::DW_FORM_sdata: D->EmitSLEB128(Integer, ""); return; 206 default: llvm_unreachable("DIE Value form not supported yet"); 207 } 208 Asm->OutStreamer.EmitIntValue(Integer, Size, 0/*addrspace*/); 209} 210 211/// SizeOf - Determine size of integer value in bytes. 212/// 213unsigned DIEInteger::SizeOf(const TargetData *TD, unsigned Form) const { 214 switch (Form) { 215 case dwarf::DW_FORM_flag: // Fall thru 216 case dwarf::DW_FORM_ref1: // Fall thru 217 case dwarf::DW_FORM_data1: return sizeof(int8_t); 218 case dwarf::DW_FORM_ref2: // Fall thru 219 case dwarf::DW_FORM_data2: return sizeof(int16_t); 220 case dwarf::DW_FORM_ref4: // Fall thru 221 case dwarf::DW_FORM_data4: return sizeof(int32_t); 222 case dwarf::DW_FORM_ref8: // Fall thru 223 case dwarf::DW_FORM_data8: return sizeof(int64_t); 224 case dwarf::DW_FORM_udata: return MCAsmInfo::getULEB128Size(Integer); 225 case dwarf::DW_FORM_sdata: return MCAsmInfo::getSLEB128Size(Integer); 226 default: llvm_unreachable("DIE Value form not supported yet"); break; 227 } 228 return 0; 229} 230 231#ifndef NDEBUG 232void 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/// 244void DIEString::EmitValue(DwarfPrinter *D, unsigned Form) const { 245 D->getAsm()->OutStreamer.EmitBytes(Str, /*addrspace*/0); 246 // Emit nul terminator. 247 D->getAsm()->OutStreamer.EmitIntValue(0, 1, /*addrspace*/0); 248} 249 250#ifndef NDEBUG 251void 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/// 262void DIELabel::EmitValue(DwarfPrinter *D, unsigned Form) const { 263 bool IsSmall = Form == dwarf::DW_FORM_data4; 264 D->EmitReference(Label, false, IsSmall); 265} 266 267/// SizeOf - Determine size of label value in bytes. 268/// 269unsigned DIELabel::SizeOf(const TargetData *TD, unsigned Form) const { 270 if (Form == dwarf::DW_FORM_data4) return 4; 271 return TD->getPointerSize(); 272} 273 274#ifndef NDEBUG 275void DIELabel::print(raw_ostream &O) { 276 O << "Lbl: " << Label->getName(); 277} 278#endif 279 280//===----------------------------------------------------------------------===// 281// DIESectionOffset Implementation 282//===----------------------------------------------------------------------===// 283 284/// EmitValue - Emit delta value. 285/// 286void DIESectionOffset::EmitValue(DwarfPrinter *D, unsigned Form) const { 287 bool IsSmall = Form == dwarf::DW_FORM_data4; 288 D->EmitSectionOffset(Label, Section, IsSmall, IsEH); 289 D->getAsm()->O << '\n'; // FIXME: Necesssary? 290} 291 292/// SizeOf - Determine size of delta value in bytes. 293/// 294unsigned DIESectionOffset::SizeOf(const TargetData *TD, unsigned Form) const { 295 if (Form == dwarf::DW_FORM_data4) return 4; 296 return TD->getPointerSize(); 297} 298 299#ifndef NDEBUG 300void DIESectionOffset::print(raw_ostream &O) { 301 O << "Off: " << Label->getName() << "-" << Section->getName() 302 << "-" << IsEH; 303} 304#endif 305 306//===----------------------------------------------------------------------===// 307// DIEDelta Implementation 308//===----------------------------------------------------------------------===// 309 310/// EmitValue - Emit delta value. 311/// 312void DIEDelta::EmitValue(DwarfPrinter *D, unsigned Form) const { 313 bool IsSmall = Form == dwarf::DW_FORM_data4; 314 D->EmitDifference(LabelHi, LabelLo, IsSmall); 315} 316 317/// SizeOf - Determine size of delta value in bytes. 318/// 319unsigned DIEDelta::SizeOf(const TargetData *TD, unsigned Form) const { 320 if (Form == dwarf::DW_FORM_data4) return 4; 321 return TD->getPointerSize(); 322} 323 324#ifndef NDEBUG 325void DIEDelta::print(raw_ostream &O) { 326 O << "Del: " << LabelHi->getName() << "-" << LabelLo->getName(); 327} 328#endif 329 330//===----------------------------------------------------------------------===// 331// DIEEntry Implementation 332//===----------------------------------------------------------------------===// 333 334/// EmitValue - Emit debug information entry offset. 335/// 336void DIEEntry::EmitValue(DwarfPrinter *D, unsigned Form) const { 337 D->getAsm()->EmitInt32(Entry->getOffset()); 338} 339 340#ifndef NDEBUG 341void DIEEntry::print(raw_ostream &O) { 342 O << format("Die: 0x%lx", (long)(intptr_t)Entry); 343} 344#endif 345 346//===----------------------------------------------------------------------===// 347// DIEBlock Implementation 348//===----------------------------------------------------------------------===// 349 350/// ComputeSize - calculate the size of the block. 351/// 352unsigned DIEBlock::ComputeSize(const TargetData *TD) { 353 if (!Size) { 354 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev.getData(); 355 for (unsigned i = 0, N = Values.size(); i < N; ++i) 356 Size += Values[i]->SizeOf(TD, AbbrevData[i].getForm()); 357 } 358 359 return Size; 360} 361 362/// EmitValue - Emit block data. 363/// 364void DIEBlock::EmitValue(DwarfPrinter *D, unsigned Form) const { 365 const AsmPrinter *Asm = D->getAsm(); 366 switch (Form) { 367 case dwarf::DW_FORM_block1: Asm->EmitInt8(Size); break; 368 case dwarf::DW_FORM_block2: Asm->EmitInt16(Size); break; 369 case dwarf::DW_FORM_block4: Asm->EmitInt32(Size); break; 370 case dwarf::DW_FORM_block: D->EmitULEB128(Size); break; 371 default: llvm_unreachable("Improper form for block"); break; 372 } 373 374 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev.getData(); 375 for (unsigned i = 0, N = Values.size(); i < N; ++i) { 376 Asm->O << '\n'; 377 Values[i]->EmitValue(D, AbbrevData[i].getForm()); 378 } 379} 380 381/// SizeOf - Determine size of block data in bytes. 382/// 383unsigned DIEBlock::SizeOf(const TargetData *TD, unsigned Form) const { 384 switch (Form) { 385 case dwarf::DW_FORM_block1: return Size + sizeof(int8_t); 386 case dwarf::DW_FORM_block2: return Size + sizeof(int16_t); 387 case dwarf::DW_FORM_block4: return Size + sizeof(int32_t); 388 case dwarf::DW_FORM_block: return Size + MCAsmInfo::getULEB128Size(Size); 389 default: llvm_unreachable("Improper form for block"); break; 390 } 391 return 0; 392} 393 394#ifndef NDEBUG 395void DIEBlock::print(raw_ostream &O) { 396 O << "Blk: "; 397 DIE::print(O, 5); 398} 399#endif 400